• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    A method of detecting an air leak in an air jet loom having an initial pressure, a main pressure and a secondary pressure, which is characterized by the following steps: setting a reduction setpoint model d at least one of the above three air pressures when no air leakage occurs in the air jet loom; compare the actual measurement model to the reference model; and determining whether an air leak occurs in the air jet loom when the actual measurement pattern differs from the target pattern.
    公开号:BE1021489B1
    申请号:E2012/0644
    申请日:2012-09-28
    公开日:2015-12-02
    发明作者:Makina Yoichi；Inamura Takahiro
    申请人:Kabushiki Kaisha Toyota Jidoshokki；
    IPC主号:
    专利说明:

    METHOD FOR DETECTING AIR LEAK IN A TRADE MACHINE
    AIR JET WEAVE
    BASIS OF THE INVENTION
    The present invention relates to a method for detecting a compressed air leak in an air jet loom.
    When any air leakage occurs due to degradation of a valve and / or line in an air jet loom that uses compressed air to insert a wire not only the compressed air consumption increases during the insertion of the weft thread, but also the unused compressed air continues to flow out of the air jet loom outside the corresponding moments at the insertion of the weft thread, which causes a waste of energy. The unused compressed air flow affects the insertion performance of the weft yarn, which makes it difficult to progress the weaving operation adequately by the air jet loom. For all these reasons, the air jet loom has a compressed air supply mechanism that is designed to prevent air leakage. However, in the event of any mounting failure or any maladjustment in the air supply mechanism of the air jet loom, an air leakage may be encountered.
    Japanese Unexamined Patent Publication No. 2-175956 discloses a device for detecting a weft insertion anomaly from the air consumption of a jet loom. air during the insertion operation of the weft thread. The device for detecting an anomaly of the insertion of the weft yarn is provided downstream of an air source with respect to the direction of flow of the air. The abnormality detection device for insertion of the weft yarn includes an air consumption measuring device, a threshold setting device, a comparator and an indicator. The air consumption measuring device includes a pressure sensor, a flow meter, a temperature sensing device, a conversion device and a computing device. The flowmeter detects the flow of the passing air and emits a signal indicating the detected flow, the pressure detector detects the air pressure and emits a signal indicating the detected pressure and the temperature sensing device detects the temperature of the air and emits a signal indicating the detected temperature.
    The computing device extracts only the data during the weft insertion operation and calculates the air consumption from the detected pressure, the detected temperature and the detected air flow. . The comparator compares the calculated air consumption with a maximum or minimum threshold value of a predefined air consumption reference value. The comparator outputs a fault warning signal when the calculated air consumption falls outside the threshold value. Therefore, any weft insertion anomaly is detected from an air consumption anomaly, which is due to a mechanical malfunction, an incorrect setting that may be induced by the human intervention, a closed nozzle and an anomaly in the pipe system.
    The weft yarn insertion anomaly detecting device disclosed in Publication No. 2-575956, which is configured to detect the air consumption of a jet loom. Airflow is unable to detect air leakage from a stationary air jet loom. In addition, the flowmeter that is used to detect the consumption of air is expensive. In addition, there is a big difference in the flow of air between the air consumption of a working air jet loom and the air consumption of the loom. with air jet when it is stopped. A flow meter that can accurately measure air consumption over a wide range is difficult to obtain.
    The present invention relates to a method of detecting an air leak in an air jet loom which is at a standstill.
    SUMMARY OF THE INVENTION
    In accordance with one aspect of the present invention, there is provided a method of detecting an air leak in an air jet loom. The air jet loom is connected to an air supply source which supplies compressed air for insertion of a weft thread. The compressed air has an initial pressure as it flows into the air jet loom. The air jet loom includes a main reservoir for storing compressed air having a main pressure which is set to be lower than the initial pressure, a secondary reservoir for storing compressed air having a secondary pressure which is also set to be lower than the initial pressure, a main nozzle that injects a jet of air from the compressed air into the main tank and a plurality of secondary nozzles that inject air jets from the compressed air into the secondary tank. The method of detecting an air leak is characterized by a step of adjusting a set point reduction model of at least one pressure selected from the group comprising the initial pressure, the main pressure and the secondary pressure of the compressed air when no air leakage occurs in the air jet loom, a step of stopping the operation of the air jet loom, a step of stopping the supply of air compressed air towards the air jet loom, a step of measuring a real measurement model of reduction of at least one pressure selected from the group comprising the initial pressure, the main pressure and the secondary pressure of compressed air, a step of comparing the actual measurement pattern to the set-point pattern, and a step of determining that an air leak occurs in the air-jet loom when ue the actual measurement model differs from the setpoint pattern. Other aspects and advantages of the invention will become apparent from the following description when taken in conjunction with the accompanying drawings illustrating by way of example the principles of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with its objects and advantages, can best be understood by reference to the following description of its presently preferred embodiments, together with the accompanying drawings in which: Figure 1 is a block diagram of a weft insertion device of an air jet loom illustrating a first embodiment of the present invention; FIG. 2 is a simple line graph showing a first waveform for reducing the initial pressure of the compressed air when no air leak occurs in the air jet loom. of Figure 1; FIG. 3 is a simple line graph showing a first waveform for reducing the initial pressure of the compressed air, when an air leak appears in a main air supply duct of the loom. air-jet weaving machine of Figure 1; FIG. 4 is a simple line graph showing a first waveform for reducing the initial pressure of the compressed air when an air leak occurs in a secondary air supply duct of the loom. air-jet weaving machine of Figure 1; Fig. 5A is a diagram of an air leakage check mode screen of a functional display panel of the air jet loom of Fig. 1, which shows a state in which a leak of air has been verified; Fig. 5B is a diagram of an air leakage check mode screen of a functional display panel similar to that of Fig. 5A, but showing a state in which no air leak occurs in the air jet loom; Fig. 5C is a diagram of an air leakage check mode screen of a functional display panel similar to that of Fig. 5A, but showing a state in which an air leakage occurs in the air jet loom; Fig. 6 is a block diagram of a weft insertion device of an air jet loom, in which a second embodiment of the present invention is illustrated; FIG. 7 is a simple line graph showing a first initial pressure reduction waveform, a second main pressure reduction waveform, and a third secondary pressure reduction waveform. compressed air, when no air leakage occurs in the air jet loom of Figure 6; FIG. 8 is a simple line graph showing a first initial pressure reduction waveform, a second main pressure reduction waveform, and a third secondary pressure reduction waveform. compressed air, when an air leak occurs in a main air supply duct of the air jet loom of Figure 6; Fig. 9 is a simple line graph showing a first initial pressure reduction waveform, a second main pressure reduction waveform, and a third secondary pressure reduction waveform. compressed air, when an air leak occurs in a secondary air supply path of the air jet loom of Figure 6; FIG. 10 is a simple line graph showing a first initial pressure reduction waveform, a fourth main pressure reduction waveform, and a fifth secondary pressure reduction waveform. compressed air, when no air leakage occurs in an air jet loom, illustrating a third embodiment of the present invention; Fig. 11 is a block diagram of a two-color weft yarn insertion device of an air jet loom illustrating a fourth embodiment of the present invention; and Fig. 12 is a simple line graph showing a first initial pressure reduction waveform, a sixth reduction waveform of the first main pressure, a seventh reduction waveform of the first pressure waveform. second main pressure and a third waveform for reducing the secondary pressure of the compressed air, when an air leak occurs in the air jet loom of Figure 11.
    DETAILED DESCRIPTION OF THE EMBODIMENTS
    Hereinafter, the first embodiment of the present invention is described with reference to FIGS. 1 to 5C. Referring to Fig. 1, showing the weft insertion device of an air jet loom in a block diagram, an air supply source is designated by the numeral reference 1 and includes an air compressor (not shown) and a dryer (also not shown). The air supply source 1 supplies compressed air to several air jet looms, one being represented in FIG. 1 and designated by the reference numeral 3, via respective ducts (only one being represented in FIG. 1 and being designated by the reference numeral 2). The air supply source 1 and the air jet looms are placed in a weaving facility. A line 5 is connected to line 2 via a valve 4 which allows or stops the supply of compressed air.
    A manometer 7 is connected to line 5 via a filter 6 for measuring the initial pressure P1 (as shown in FIG. 2) of compressed air fed from the air supply source 1. The initial pressure P1 is set to be greater than the pressure of the compressed air which is used to insert the weft yarn of the air jet loom 3. A main tank 9 is connected to the manometer 7 via a main regulator 8 by a pipe 5. The main regulator 8 reduces the initial pressure P1 of the compressed air to a main pressure P2 (as shown in FIG. 7) which is suitable for the insertion of the weft yarn and the compressed air whose pressure has has been reduced to the main pressure P2 is stored in the main tank 9. It should be indicated that the main pressure P2 is set to be lower than the initial pressure P1. A main nozzle 11 is connected to the main tank 9 via a main valve 10.
    When the main valve 10 is actuated to open it, the compressed air in the main tank 9 feeds the main nozzle 11 which injects an air jet for insertion of the weft yarn. A pipe 12 forks from the pipe 5 which connects the pressure gauge 7 and the main regulator 8 to each other and is connected via a throttling valve 13 to the pipe 5 which connects one to the other the main valve 10 and the main nozzle 11 to thereby obtain a "breeze" circuit. Thus, a small amount of compressed air regulated by the throttle valve 13 feeds the main nozzle 11 steadily without taking into account the weft insertion operation of the main nozzle 11 in order to maintain a thread. frame in the main nozzle 11.
    A pipe 14 forks from the pipe 5 which connects the pressure gauge 7 and the main regulator 8 to each other and is connected to a secondary tank 16 via a secondary regulator 15. The secondary regulator 15 reduces the initial pressure PI compressed air to a secondary pressure P3 (as shown in Fig. 7) which is suitable for insertion of the weft yarn and compressed air whose pressure has been reduced to the secondary pressure P3 is stored in the secondary tank 16. It should be noted that the secondary pressure P3 is set to be lower than the initial pressure P1 and greater than the main pressure P2. Four secondary valves 17 are arranged in the insertion direction of the weft thread and are connected to the secondary reservoir 16 by respective conduits 14. Four groups of secondary nozzles 18 which inject air jets are arranged in the direction of insertion. of the weft yarn and each group has three secondary nozzles 18. The secondary nozzle groups 18 correspond to the respective secondary valves 17. The three secondary valves 18 of each group are connected to their corresponding secondary valve 17 by respective conduits 14. At each Once the secondary valve 17 is actuated to open, the compressed air having the secondary pressure P3 in the secondary reservoir 16 supplies its corresponding group of secondary nozzles 18 to facilitate the theft of a weft thread through a shed.
    The pressure gauge 7 is electrically connected to a controller 20 having a functional display screen 19 and transmits to the controller 20 data relating to the measured initial pressure PI. The controller 20 has a portion occupied by a memory for storing the data relating to the initial pressure P1 transmitted by the manometer 7 as well as setpoints, an operational part for performing various calculations based on the data concerning the initial pressure P1 and a timer for calculating the time corresponding to the measurement of the initial pressure P1 by the pressure gauge 7. In addition, the controller 20 has several programs necessary for the operation of the air jet loom 3. Although this is not shown in FIG. 1, the controller 20 is connected to the main valve 10 and the secondary valves 17 for transmitting signals for controlling the operation of the main valve 10 and the secondary valves 17.
    The simple line graph of FIG. 2 represents a first waveform for reducing the initial pressure P1 which appears when the air jet loom 3 free of air leakage is stopped: at this moment, the valve 4 is actuated to stop the supply of compressed air to the air jet loom 3. The first waveform of the initial pressure P1 is measured by the pressure gauge 7 and is stored in the controller 20. A pressure of reference P which is lower than the initial pressure P1 is pre-established as a reference value and is stored in the controller 20. It should be noted that the preferential pressure P is set to be lower than the main pressure P1 and the secondary pressure P3 (as can be seen in Figure 7). As represented in FIG. 2, the initial pressure P1 undergoes a reduction over time and reaches the reference pressure P at time T, or after the lapse of time T. The initial pressure P1 undergoes a further reduction up to the zero value at time tl. Subsequently, the initial pressure PI begins to rise at time t2 and exceeds the reference pressure P at time t3. Then, the initial pressure P1 is reduced to the reference pressure P at time t4, and continues its reduction to zero.
    It can be considered that we obtain the first reduction waveform of the initial pressure PI, which is represented in FIG. 2, by the balance between the compressed air which remains in the ducts 514 and the air compressed which remains in the main tank 9 and in the secondary tank 16 when such compressed air is released from the main nozzle 11 in the form of a breeze. In the present embodiment, both the setpoint model and the actual measurement model for reducing the initial pressure P1 of the compressed air use the time necessary to reduce the initial pressure P1 of the compressed air to a minimum predetermined pressure value. The time T corresponding to the reduction of the initial pressure PI of the compressed air to the reference pressure P in the absence of air leakage in the air jet loom 3 is set as reference time of the initial pressure PI and such a reference time T is stored in the controller 20. The reference time T can be preset by measuring the initial pressure PI by the manometer 7, for example before starting the operation of 3. It should be noted that the reference time T is not limited to measurement data, can not be calculated and adjusted on the basis of specifications such as the capacity of the airbag loom. main tank 9 and the secondary tank 16, the main pressure P2, the secondary pressure P3, the flow of air in the form of a breeze and the number of colors of the weft threads for the insertion.
    When an air leak occurs in line 5 (or in the main air supply line) which connects the pressure gauge 7 and the main reservoir 9 to one another and when the valve 4 is closed the initial pressure P1 is reduced in accordance with the first waveform of FIG. 3. As shown in FIG. 3, the initial pressure P1 undergoes a rapid reduction to reach the reference pressure P at the time T1 and continues its reduction to reach the zero value at time t5. Then, the initial pressure PI starts to rise at time t6 and exceeds the reference pressure P at time t7. Then, the initial pressure P1 is reduced to the reference pressure P at time t8 and continues to reduce until it reaches zero. Although the first waveform of the initial pressure P1 of Figure 3 is similar to the first waveform of the initial pressure P1 of Figure 2, the first waveform of Figure 3 differs substantially. relative to the first waveform of FIG. 2 in that the time T1 corresponding to the reduction of the initial pressure P1 to the reference pressure P in the case of FIG. 3 is shorter than the time T corresponding to the reduction of the initial pressure PI to the reference pressure P in the case of Figure 2.
    When an air leak occurs in the conduit 14 (or in the secondary air supply path) from the line 5 which is connected to the secondary reservoir 16 and when the valve 4 is closed, the initial pressure PI is reduced in accordance with the first waveform of FIG. 4. As shown in FIG. 4, the initial pressure PI undergoes a rapid reduction to reach the reference pressure P at time T2 and continues its reduction to the value zero at time t9. After the time t9, the initial pressure P1 remains at zero as shown in FIG. 4. Thus, the initial pressure P1 of FIG. 4 never rises, unlike the initial pressure P1 in the case of FIG. The first waveform of Figure 4 differs substantially from the first waveform of Figure 2, as is the case with the first waveform of Figure 3, in that the time T2 corresponding to the reduction of the initial pressure P1 to the reference pressure P in the case of FIG. 4 is shorter than the time T corresponding to the reduction of the initial pressure P1 to the reference pressure. P in the case of Figure 2.
    Thus, by adjusting the reference pressure P and the reference time T at which the initial pressure P1 is reduced to reach the reference pressure P in the controller 20 and by measuring the initial pressure P1 via the pressure gauge 7 when the valve 4 is closed, one can easily detect any air leak that appears in the loom air jet 3. It should be noted that the measured time T1 is shorter than the measured time T2. When the upper and lower limits of the difference between the reference time T and the measured time T1 and the difference between the reference time T and the measured time T2 are set beforehand in the controller 20, it is possible to proceed determination as to whether an air leak occurs in the main air supply line or in the secondary air supply line.
    Hereinafter, an example of checking an air leak in the air jet loom 3 will be described with reference to FIGS. 5A to 5C. The verification of an air leak is implemented when the air jet weaving loom 3 is stopped and when the valve 4 is closed manually or automatically to stop feeding the weaving loom. compressed air jet 3 from the air supply source 1. Figs. 5A to 5C are diagrams showing air leakage check mode screens of a control panel. functional display of the air jet loom 3. Each air leakage check mode screen includes windows that represent the established reference pressure, the reference time, the initial pressure in effect, the time frame elapsed and the result of the air leak check. The screen further includes touch switches for starting and stopping the time measurement.
    Referring to FIG. 5A, which shows the screen obtained when an air leak is being verified, the values P (MPa) and T (seconds) are displayed in the respective windows of FIG. the pre-set reference pressure and the reference time. When the valve 4 is closed and when the YES switch is touched to measure the time, the manometer 7 begins to measure the initial pressure P1 and the timer starts to count the time. The effective pressure of the compressed air which is reduced over time is displayed by the value Pl-n (MPa) in the window corresponding to the initial pressure in force. The amount of time T-n (seconds) has elapsed since the beginning of the pressure measurement is displayed in the window corresponding to the elapsed time. An "air leakage in check" message is displayed in the air leak check result window. The manometer 7 puts an end to the measurement of the initial pressure P1 when the initial pressure P1 has undergone a reduction to reach the preset reference pressure P.
    Referring to FIG. 5B, in which the screen corresponding to the stopping of the measurement by the pressure gauge 7 is shown, the values P (MPa) and T (seconds) are displayed in the respective windows of the initial pressure. in force and elapsed time, respectively. As shown in FIG. 5B, the period of time corresponding to the reduction of the initial pressure up to the initial pressure in force is equal to the reference time, so that the controller 20 determines that there is no air leakage in the loom to air jet weave 3 and displays the message "no air leakage" in the window corresponding to the result of the air leakage check.
    Furthermore, with reference to FIG. 5C, in which the screen corresponding to the stopping of the measurement by the manometer 7 is represented, the value Tn (seconds) is displayed in the window corresponding to the time corresponding to the reduction of the initial pressure in force up to the pressure P (MPa). The elapsed time Tn (seconds) that is represented in FIG. 5C corresponds to the time T1 (seconds) that is represented in FIG. 3 and also corresponds to the time T2 (seconds) that is represented in FIG. 4. Thus, the elapsed time Tn (seconds) differs from the reference time T (seconds). Consequently, the controller 20 determines the presence of an air leak in the air jet loom 3 and the message "air leakage" appears in the window corresponding to the result of the leak check of air.
    In the first embodiment in question, in which the reference time corresponding to the reduction of the initial pressure P1 is used up to the reference pressure P in the absence of air leakage in the jet loom. of air 3 respectively as the setpoint model and the actual measurement model of the pressure reduction and in which the change of pressure is measured, it is possible to detect with ease and precision any air leakage in the loom 3. When the message "air leakage" appears in the air leakage check mode screen of the functional display panel of the air jet loom, as shown in Figure 5C, the operator intervenes and sets up a procedure to eliminate the cause of the air leak.
    Hereinafter, the second embodiment of the present invention is described with reference to Figs. 6 to 9. In the description of the second embodiment, like reference numerals denote like parts or elements used in the description. of the first embodiment and the description of said parts will be omitted. Referring to FIG. 6, showing the weft insertion device of an air jet loom of the second embodiment in a block diagram, the feed system of FIG. The air of the air jet loom 3 includes the pressure gauges 24 and 25 as well as the manometer 7 which measures the initial pressure P1. The gauge 24 is connected to the main tank 9 to measure the main pressure P2 (as can be seen in Figure 7) and the gauge 25 is connected to the secondary tank 16 to measure the secondary pressure P3 (as can be seen in Figure 7 ). By closing the valve 4 in the second embodiment, at the same time the first reduction waveform of the initial pressure P1 is measured, the second reduction waveform of the main pressure P2 and the third form of reduction wave of the secondary pressure P3 of the compressed air.
    FIG. 7 shows a simple line graph of the initial pressure reduction waveforms P1, the main pressure P2 and the secondary pressure P3 when the air jet loom 3 is leak free. air is stopped and when the valve 4 is actuated to stop the supply of the air jet loom 3 compressed air. As can be seen by comparison between FIGS. 2 and 7, the first reduction waveform of the initial pressure P1 of FIG. 7 is essentially identical to the first initial pressure reduction waveform P1 of FIG. FIG. 2. Specifically, the time T corresponding to the reduction of the initial pressure P1 to the reference pressure P in the case of FIG. 7 is essentially identical to the time T corresponding to the reduction of the initial pressure P1. at the reference pressure P in the case of FIG. 2. The main pressure P2, measured by the pressure gauge 24, is maintained at a high level for a short period of time, but is reduced to coincide with the reduced initial pressure P1. at time t10 which is shorter than time T or earlier than the latter. Subsequently, the main pressure P2 is reduced substantially in the same way as that of the initial pressure P1. Thus, the main pressure P2 is reduced to the reference pressure P at time T and continues to decrease until to the value zero at time tl. The main pressure P2 begins to rise at time t2 and exceeds the reference pressure P at time t3.
    While the reduction of the initial pressure P1 and the main pressure P2 is effected rapidly, the secondary pressure P3 measured by the pressure gauge 25 is maintained at a high level at time T. Subsequently, the secondary pressure P3 undergoes a reduction to coincide with the rise of the initial pressure P1 and the main pressure P2 at time t3. After the time t3, the secondary pressure P3 undergoes a reduction in essentially the same way as that of the initial pressure P1 and the main pressure P2. Thus, a reduction of the initial pressure P1, of the main pressure P2 and of the secondary pressure P3 to the reference pressure P at time t4 is obtained, said reduction then continuing until reaching the zero value.
    In the case where an air leak occurs in line 5 (or in the main air supply line) which connects the pressure gauge 7 and the main reservoir 9 to each other, the initial pressure PI undergoes a reduction in accordance with the first pressure reduction waveform, as shown in FIG. 8 when the valve 4 is closed. As can be seen from the comparison between FIGS. 8 and 3, the initial pressure of FIG. 8 has the same first waveform as that of FIG. 3. The initial pressure PI of FIG. 8 undergoes a reduction. up to the reference pressure P at the time T1 which is prior to the reference time T. The main pressure P2 of FIG. 8 is rapidly reduced to coincide with the initial pressure P1 at the time T1. main P2 has essentially the same waveform as that of the initial pressure P1. While the reduction of the initial pressure P1 and the main pressure P2 is carried out rapidly, the secondary pressure P3, in the case of FIG. , is maintained at a high level as in the case of the secondary pressure P3 of FIG. 7 at time T1.
    At time T1, the initial pressure P1 and the main pressure P2 of FIG. 8 have waveforms similar to those of FIG. 7. The initial pressure P1 and the main pressure P2 are reduced to reach zero at the time t5. Subsequently, the initial pressure P1 and the main pressure P2 start to rise at time t6 and exceed the reference pressure P at time t7. The secondary pressure P3 coincides with the initial pressure P1 and with the main pressure P2 at time t7. After the time t7, the secondary pressure P3 has essentially the same waveform as that of the initial pressure P1 and the main pressure P2. Then, the initial pressure P1, the main pressure P2 and the secondary pressure P3 are reduced to the reference pressure P at time t8 and thereafter to zero.
    In the case where an air leak occurs in the pipe 14 (or in the secondary air supply path) which branches off from the pipe 5 and which is connected to the secondary tank 16, the initial pressure P1 undergoes a reduction in accordance with the first pressure reduction waveform as shown in FIG. 9 when the valve 4 is closed. The initial pressure P1 of FIG. 9 has the same first waveform as that of the initial pressure P1 of FIG. 4. The initial pressure P1 of FIG. 9 undergoes a reduction up to the reference pressure P at time T2. which is prior to the reference time T. The main pressure P2 and the secondary pressure P3 undergo a fast reduction to coincide with the initial pressure P1 at the time t1 which is prior to the time T2. After the time t11, the main pressure P2 and the secondary pressure P3 essentially have the same waveform as that of the initial pressure P1. Therefore, when an air leak occurs in the secondary supply path of air, the secondary pressure P3 of Figure 9 does not have the third waveform which maintains a high pressure, but differs from the secondary pressure P3 of Figure 8.
    In the second embodiment, in the absence of an air leak in the air jet loom 3, the reference time T corresponding to the reduction of the initial pressure P1 and the main pressure P2 up to the reference pressure P and the time t4 which corresponds to the reduction of the secondary pressure P3 to the reference pressure P are pre-set. It should be noted that the time t4 is longer than the reference time T. When comparing the times T1, t8 (in the case of Figure 8) and T2 (in the context of Figure 9) corresponding to the reduction of the initial pressure P1, the main pressure P2 and the secondary pressure P3, as measured by the pressure gauges 7, 24 and 25, to reach the reference pressure P with the preset times T and t4, it is possible to determine the fact of find out if there is an air leak in the main air supply line or in the secondary air supply line. For example, when measuring the pressure reduction waveforms of FIG. 8, the occurrence of an air leak in the main air supply path is determined, since the time T1 corresponding to the reduction of the initial pressure P1 and the main pressure P2 to the reference pressure P is earlier than the preset reference time T and the time t8 is longer or later than the time T1. the pressure reducing waveforms of FIG. 9 are measured, the occurrence of an air leak in the secondary air supply path is determined, since the time T2 corresponding to the reduction of the initial pressure P1 and of the main pressure P2 up to the reference pressure P is earlier than the preset reference time T. In the second embodiment, the pressure gauge 24 which measures the main pressure P2 can be omitted, since the second form The reduction wave of the main pressure P2 coincides with the first reduction waveform of the initial pressure P1 at the time T1 or at a time which is before the time T2.
    In the second embodiment described above, the setpoint pattern and the actual measurement pattern can be modified, respectively, as follows. Specifically, referring to FIG. 7, the time corresponding to the reduction of the initial pressure P1 to the reference pressure R is pre-established as the "reference time T". In addition, the third reduction waveform of the secondary pressure P3 is preset such that the secondary pressure P3 is maintained at a high level after the reference time T and so that the secondary pressure P3 reaches the pressure preferably P at time t4. Therefore, when an air leak in the air jet loom 3 is detected because the time T1 or T2 is shorter than the reference time T, it is determined whether the measurement is made. the third set waveform of the reduction of the secondary pressure P3. If the third reduction waveform of the secondary pressure P3 is measured, an air leak occurs in the main air supply path. If the third reduction waveform of the secondary pressure P3 is not measured, an air leak occurs in the secondary air supply path. In this modification, it is possible to eliminate the manometer 24 which measures the main pressure P2.
    The second embodiment described above can be modified so that both the first reduction waveform of the initial pressure P1, the second waveform of the reduction of the main pressure P2 are pre-established. and the third waveform of reducing the secondary pressure P3. In this modification, any air leak that appears in the air jet loom 3 can be detected by comparing the measured waveforms of the pressure reduction with the controlled waveforms of the reduction. pressure. This modification makes it possible to dispense with the manometer 24 which measures the main pressure P2.
    Hereinafter, the third embodiment of the present invention is described with reference to Fig. 10. In the description of the third embodiment, like reference numerals denote like parts or elements used in the description of the present invention. the first and second embodiments and the detailed description of said parts will be omitted. Referring to FIG. 10, in which the first reduction waveform of the initial pressure P1 is represented in the form of a simple linear graph, the fourth waveform of reduction of the main pressure P4 and the fifth waveform of reducing the secondary pressure P5 of the compressed air in the absence of air leakage in the air jet loom, as a third embodiment of the present invention. , the main pressure P4 is set to be greater than the secondary pressure P5. By closing the valve 4, in the absence of air leakage in the air jet loom, the initial pressure PI is reduced to the reference pressure P at the reference time T and then continues to reduction. The initial pressure P1 begins to rise at time t13 and exceeds the reference pressure P at time t14. Then, the initial pressure P1 is reduced to the reference pressure P at time t15 and continues to reduce to zero.
    The main pressure P4 is rapidly reduced to coincide with the initial pressure P1 at the time t12 which is prior to the reference time T. After the time t12, the main pressure P4 has essentially the same wavelength as that of the initial pressure Pl. On the other hand, the secondary pressure P5 is maintained at a high level until the time T. After the time T, the secondary pressure P5 is reduced to coincide with the rise in the initial pressure P1 and the main pressure P4. at time tl4. After time t14, the secondary pressure P5 has essentially the same wavelength as that of the initial pressure P1 and the main pressure P4. Consequently, the reduction waveforms of the initial pressure P1, the main pressure P4 and the secondary pressure P5 of the third embodiment of FIG. 10 are similar to those of the initial pressure P1, the pressure main P4 and the secondary pressure P5 of the second embodiment of Figure 7. In the embodiment in which the main pressure P4 is adjusted to a value greater than that of the secondary pressure P5, it is possible to detect a leak of in the air jet loom 3 using the lapse of time or the waveform of the pressure reduction, as is the case in the first and second embodiments.
    Hereinafter, the fourth embodiment of the present invention is described with reference to Figs. 11 and 12. In the description of the fourth embodiment, like reference numerals denote like parts or elements used in the description. of the first and second embodiments and the detailed description of said parts will be omitted. Fig. 11 is a block diagram of a two-color weft yarn insertion device of the air jet loom, illustrating the fourth embodiment of the present invention. The two-color weft thread insertion device of the air jet loom 3 has a first main nozzle 11A and a second main nozzle 11B. The manometer 7 is connected to a first main tank 9A via a first main regulator 8A via a line 5. The first main tank 9A is connected to the first main nozzle 11A via a first main valve 10A via a pipe 5. A first pressure gauge 24A is connected to the first main reservoir 9A for measuring a first main pressure P2A (as can be seen in Figure 12). A first pipe 12A branches off from the pipe 5 which connects the pressure gauge 7 and the first main regulator 8A to one another, and which is connected via a first throttle valve 13A to the pipe 5 which connects the to one another the first main valve 10A and the first main nozzle 11A to thereby form a breeze circuit.
    The manometer 7 is connected to a second main tank 9B via a second main regulator 8B via a line 5. The second main tank 9B is connected to the second main nozzle 11B via a second main valve 10B via a line 5. A second pressure gauge 24B is connected to the second main reservoir 9B to measure a second main pressure P2B (as can be seen in Figure 12). A second pipe 12B forks with respect to the pipe 5 which connects the pressure gauge 7 and the second main regulator 8B to each other and which is connected via a second throttle valve 13B to the pipe 5 which connects the one to the other the second main valve 10B and the second main nozzle 11B to thereby form a breeze circuit.
    The main pressures P2A and P2B of the compressed air fed to the main nozzles 11A and 11B are adjusted to the same level and also to the same level as that of the main pressure P2 of the first and second embodiments. When the air jet loom 3 free of air leakage is stopped and when the valve 4 is closed, the reduction waveforms of the initial pressure P1, the first main pressure P2A, of the second main pressure P2B and the secondary pressure P3 of the fourth embodiment are similar to those of the initial pressure P1, the main pressure P2 and the secondary pressure P3 of the second embodiment which is shown In FIG. 7, therefore, when the air jet loom 3 free of air leakage is stopped and when the valve 4 is closed, the time T corresponding to the reduction of the initial pressure P1 to the reference pressure P is set as the reference time. It should be noted that the main pressures P2A and P2B can be set at different levels.
    Referring to FIG. 12, in which, in the form of a simple line graph, the first reduction waveform of the initial pressure P1, the sixth waveform is shown in FIG. for reducing the first main pressure P2A, the seventh reduction waveform of the second main pressure P2B and the third waveform for reducing the secondary pressure P3 of the compressed air in the presence of a leak of In the air jet loom according to Fig. 11, the initial pressure P1 measured by the manometer 7 undergoes a rapid reduction, before keeping it at a high level for a short time after the time t16. Then, the initial pressure P1 is reduced to the reference pressure P at time T3 before continuing its reduction to zero at time t17. The initial pressure PI begins to rise at time tl8 and exceeds the reference pressure P at time tl9. Subsequently, the initial pressure P1 is reduced to the reference pressure P at time t20 before continuing its reduction to zero.
    The first main pressure P2A measured by the first pressure gauge 24A undergoes a slow reduction to coincide with the initial pressure P1 at time t16. The first main pressure P2A has essentially the same waveform as that of the initial pressure P1 after the time t16. Moreover, the second main pressure P2B measured by the second pressure gauge 24B is rapidly reduced to the reference pressure P at the time T4 which is before the time T3, before undergoing a reduction to coincide with the initial pressure PI at the time T3. After the time T3, the second main pressure P2B has essentially the same waveform as that of the initial pressure P1. The secondary pressure P3 measured by the manometer 25 at a high level at time T4 and also at time T3. Subsequently, the secondary pressure P3 is reduced to coincide with the initial pressure P1 at time t19. After time tl9, the secondary pressure P3 has essentially the same wavelength as that of the initial pressure P1.
    Consequently, since the time T3 corresponding to the reduction of the initial pressure P1 to the reference pressure P is earlier than the reference time T (as can be seen in FIG. 7) corresponding to the reduction of the pressure initial PI to the reference pressure P in the absence of air leakage in the air jet loom 3, it is determined that an air leak occurs in the jet loom of air 3. Although the first main pressure P2A and the secondary pressure P3 are subject to a slow reduction, since the reduction of the second main pressure P2B to the reference pressure P takes place at the time T4 which is earlier at the reference time T, it is determined that the air leakage takes place in the pipe 5 (or in the first main air supply line) which connects the manometer 7 and the main tank to each other 9B. Thus, by using the times which correspond to the reduction of the initial pressure P1, the first main pressure P2A, the second main pressure P2B and the secondary pressure P3 to the reference pressure P as models for reducing the pressure. pressure, it is easy to detect an air leak in the air jet loom 3 having a multicolor weft insertion device. It should be noted that the waveforms of the reduction of the initial pressure P1, the first main pressure P2A, the second main pressure P2B and the secondary pressure P3 can be used as models for reducing the pressure of the fourth embodiment.
    The present invention has been described in the context of the above embodiments, but is not limited to these embodiments. Those skilled in the art will understand that the invention can be implemented in a variety of ways as exemplified below.
    In embodiments 2 to 4, an air leakage can be detected only in line 5 (or in the main air supply line) which connects the manometer 7 and the reservoir to each other. 9 (or the main tanks 9A and 9B) using the time corresponding to the reduction of the main pressure P2 measured by the pressure gauge 24 (or by the main pressures P2A and P2B measured by the gauges 24A and 24B) up to the reference pressure P or the reduction waveform of said pressures.
    In embodiments 2 to 4, an air leak can be detected only in line 14 (or in the secondary air supply path) which branches off with respect to line 5 and which is connected to the secondary reservoir. 16, using the time taken by the reduction of the secondary pressure P3 measured by the manometer 25 to the reference pressure P or the waveform of reduction of such a pressure.
    In embodiments 2 to 4, an air leak which appears in the main air supply duct and in the secondary air supply duct can be detected using the times corresponding to the reduction of the air supply. main pressure P2 and the secondary pressure P3 measured by the gauges 24 and 25, up to the reference pressure P, or the reduction waveforms of said pressures, or alternatively by using the times corresponding to the reduction of the first main pressure Ρ2Δ, the second main pressure P2B and the secondary pressure P3 measured by the pressure gauges 24A, 24B and 25, up to the reference pressure P, or the waveforms of reduction of said pressures, without measuring the initial pressure PI.
    In embodiments 2 to 4, the valve 4 can be provided in the form of an electromagnetic valve which is opened from a switch provided on the functional display panel 19, so that the valve 4 is closed. by a switching operation performed on the functional display panel 19. The reference time T which corresponds to the reduction to the reference pressure P of the initial pressure P1, the main pressures P2, P2A, P2B and the P3 secondary pressure measured by the manometers 7, 24, 24A, 24B, or the waveforms of the reduction of said pressures are measured automatically and are established in the controller 20 automatically.
    权利要求:
    Claims (6)
    [1]
    A method of detecting an air leak in an air jet loom (3), the air jet loom (3) being connected to an air supply source ( 1) which supplies compressed air for insertion of a weft thread, the compressed air having an initial pressure (P1) as it flows into the air jet loom ( 3), the air jet loom (3) including a main reservoir (9, 9A, 9B) for storing the compressed air having a main pressure (P2, P2A, P2B, P4) which is set to be less than the initial pressure (P1), a secondary reservoir (16) for storing the compressed air having a secondary pressure (P3, P5) which is also set to be lower than the initial pressure (P1), a main nozzle (11). , 11A, 11B) which injects an air jet from compressed air into the main reservoir (9, 9A, 9B) and a plurality of secondary nozzles (18) which inject air jets from compressed air in the secondary tank (16), the method of detecting an air leak being characterized by: a step of adjusting a reduction set point model of at least one selected from the group consisting of the initial pressure (Pl), the main pressure (P2, P2A, P2B, P4) and the secondary pressure (P3, P5) of the compressed air when no air leak occurs in the jet loom air (3); a step of stopping the operation a step of stopping the supply of compressed air to the air jet loom (3); a step of measuring a real measurement model of reduction of at least one pressure selected from the group comprising the initial pressure (P1), the main pressure (P2, P2A, P2B, P4) and the secondary pressure (P3, P5 ) compressed air; a step of comparing the actual measurement model with the setpoint model; and a step of determining that an air leak occurs in the air jet loom (3) when the actual measurement pattern differs from the setpoint pattern.
    [2]
    Air leak detection method according to claim 1, characterized in that each of the setpoint model and the actual measurement model represents a pressure reduction waveform (P1, P2, P2A, P2B, P4, P3, P5) of the compressed air.
    [3]
    3. A method of detecting an air leak according to claim 1, characterized in that each model among the setpoint model and the actual measurement model represents an elapsed period of time (T, T1, T2, T3, t4 , t8, t15, t20) corresponding to the reduction of a pressure (P1, P2, P2A, P2B, P4, P3, P5) of the compressed air to a reference pressure (P) which is established as a value reference.
    [4]
    4. A method of detecting an air leak according to claim 3, characterized in that the adjustment step represents a step of setting the respective elapsed time periods (T, t4, tl5) which correspond to the reduction up to to the reference pressure (P) of the initial pressure (PI), the main pressure (P2, P2A, P2B, P4) and the secondary pressure (P3, P5) of the compressed air in the absence of an air leak in the air jet loom (3), the measuring step represents a step of measuring the respective elapsed time periods (T, Tl, T2, T3, t4, t8, tl5 , t20) corresponding to the reduction to the reference pressure (P) of the initial pressure (P1), the main pressure (P2, P2A, P2B, P4) and the secondary pressure (P3, P5) of compressed air, and the comparison step represents a step of comparing the measured elapsed time (T, T1, T2, T3, t4, t8, t15, t20) with the established elapsed time (T, t4,tl5), respectively.
    [5]
    5. A method of detecting an air leak according to any one of claims 1 to 3, characterized in that the actual measurement model represents a model for reducing the initial pressure (P1) of the compressed air.
    [6]
    6. A method of detecting an air leak according to claim 1, characterized in that each model among the setpoint model and the actual measurement model for reducing the initial pressure (P1) represents an elapsed period of time ( T) corresponding to the reduction of the initial pressure (P1) of the compressed air to a reference pressure (P) which is established as the reference value, each model of the setpoint model and the actual measurement model of reduction of the secondary pressure (P3) represents a waveform for reducing the secondary pressure (P3) of the compressed air, the adjustment step represents a step of setting the elapsed time (T) corresponding to the reduction of the initial pressure (P1) to the reference pressure (P) and the secondary pressure reduction waveform (P3) in the absence of air leakage in the weave (3), the measuring step represents a step of measuring the elapsed time (T) corresponding to the reduction of the initial pressure (P1) to the reference pressure (P) and the secondary pressure reduction waveform (P3) , the comparing step represents a step of comparing the measured elapsed time (T) of the initial pressure (P1) and the measured waveform of the reduction of the secondary pressure (P3) with the lapse of time setpoint flow (T) of the initial pressure (P1) and the secondary pressure reduction setpoint waveform (P3), respectively.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP11223648|2011-10-11|
    JP2011223648A|JP5780102B2|2011-10-11|2011-10-11|Air leak detection method for air jet loom|
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