• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of parameterizing a container manufacturing plant (1) comprising: - a mold (7) having a displaceable mold bottom (11), - a displaceable drawing rod (20) and a coupled electric machine (21) at the rod (20); - from a configuration in which the rod (20) is in a high position and in the bottom (11) in an extended position, operate the machine (21) motor motor; evaluate the resultant axial forces on the rod (20); when a variation in the resultant of the forces is detected, assigning to the rod (20) an original position; - control the movement of the bottom (11) of mold to its retracted position; - assign to the rod (20) the corresponding position, said final, of the rod (20); - calculate the difference between the end position and the original position.
    公开号:FR3023503A1
    申请号:FR1456739
    申请日:2014-07-11
    公开日:2016-01-15
    发明作者:Pierrick Protais
    申请人:Sidel Participations SAS；
    IPC主号:
    专利说明:

    [0001] The invention relates to the parameterization of the manufacturing facilities of the containers by stretching blow molding of plastic blanks, for example polyethylene terephthalate (PET). Typically, a container comprises a body, a bottom closing the body at a lower end thereof, and a neck that opens at an upper end of the body to allow filling and emptying the container. A conventional technique for manufacturing containers is blowing. This technique consists in introducing the blank (ie a preform or an intermediate container having undergone a preforming operation), previously heated to a temperature above the glass transition temperature of the material (approximately 80 ° C. in the case of PET) in a mold having a wall defining a cavity in the cavity of the container, and injecting into the blank, through the neck, a fluid, such as a gas (generally air), under pressure for press the material against the wall of the mold.
    [0002] Under the effect of pressure, the material softened by the heating forms a bubble which swells and develops both in an axial direction, parallel to the main axis of the mold, and in a radial direction, perpendicular to the axis of the mold. In order to avoid any misalignment of the container and to ensure a good distribution of the material, the axial drawing of the blank is forced by means of an axially displaceable rod in the mold, this rod comprising a distal end pushing back the bottom of the blank until it comes to press against a mold bottom to the footprint of the bottom of the container. This technique is called stretch blow molding.
    [0003] It is known, for certain applications, that the mold base is movable relative to the wall between an extended position in which the mold base is recessed with respect to the cavity, and a retracted position in which the mold bottom closes. the cavity. Initially in retracted position, the mold bottom is moved to its deployed position during forming of the container. This technique, known as "boxing" and described in detail in the French patent application FR 2 975 332 or its international equivalent VVO 2012/156638 (both in the name of Sidel Participations), makes it possible to increase the drawing ratio of the material and has the double advantage of structurally strengthening the bottom of the container and improve the impression of it.
    [0004] The boxing technique is complex because, depending on the shape and depth of the reliefs (still called reserves) to be made on the bottom of the container, the spinning carried out by the mold bottom can lead to a thinning of the material, or even a break local wall of the container at its bottom, which makes it unusable. This is why the adjustment of the manufacturing machines including the boxing function is delicate; it is generally entrusted to experienced operators whose turn allows to make conforming containers in the judgment. But it is difficult to obtain a constant quality for the containers, each operator having his own knack. In addition, experienced operators are not always available to correct the settings, it is sometimes necessary to stop the production line to avoid the accumulation of non-compliant containers. During a reference change (in other words container model) on the machine, the operator may have to modify certain parameters related to boxing, including the boxing race, that is to say the distance separating the retracted position of the mold base from its extended position. Such a modification, if not performed correctly, can lead to malformations affecting the containers. This results in the shutdown of the installation, following the awareness by the operator of a recurring defect affecting the containers produced and a scrapping of the containers manufactured between the start of production and the shutdown. of the installation.
    [0005] A first objective is therefore to propose a solution to improve the quality of the containers produced. A second objective is to propose a solution to limit the risk of malformation of the containers, especially at the level of their funds.
    [0006] A third objective is to limit, or even to avoid, parameter setting errors during reference changes on container manufacturing facilities.
    [0007] For this purpose, it is proposed a method of parameterizing a facility for manufacturing containers by stretch blow molding from plastic blanks, this installation comprising: a mold provided with a wall defining a cavity with the imprint of the container, extending along a main axis of the mold and a mold base movable axially relative to the wall between an extended position and a retracted position, - a device for controlling the movement of the mold bottom, suitable for exerting on the mold bottom an axial thrust to move from its extended position to its retracted position and vice versa; - A drawing device comprising a drawing rod axially movable relative to the wall and an electric machine coupled to the rod; this method comprising the operations consisting, from an initial configuration in which the rod is in a position high apart from the mold bottom and in which the mold bottom is in its extended position or in its retracted position, to: operate the electric motor machine for exerting on the rod an axial driving force which moves it towards the bottom of the mold; evaluate the resultant axial forces exerted on the stem; when a variation in the resultant of the forces is detected, to assign to the stem a position of origin; - memorize the original position; controlling the displacement of the mold base towards its retracted position or, respectively, its extended position; assign to the stem the corresponding position, called final, of the rod; calculate and memorize the gap, called the rod stroke, between the end position and the original position. The stroke of the rod being equal to the stroke of the mold bottom, this method makes it possible to verify, prior to the start of production, the stroke of the mold base and thus to prevent errors affecting the adjustments made by the operator. do not affect the production.
    [0008] Various additional features may be provided, alone or in combination: in the initial configuration, the mold bottom is in its extended position; there is provided, between the operation of memorizing the original position and the movement control of the mold base, an operation of placing the rod in the up position; after the movement control operation of the mold base, the following operations are performed: the electric machine operating as a motor, moving the rod from its upper position towards the mold base; evaluate the resultant axial forces exerted on the stem; when a variation in the resultant of the forces is detected, to affect to the rod its final position; there is provided between the original position storing operation and the mold bottom moving control an operation of ceasing to apply the axial driving force to the shaft; the cessation of the application of the axial driving force on the rod is achieved by the cessation of operation of the electric machine motor; - After the cessation of the use of the electric machine in motor and before the movement control of the mold bottom, the electric machine is switched to operate as a generator; after the control of the displacement of the mold base, a predetermined time delay is provided; - There is provided a comparison operation of the stroke of the rod with a predetermined theoretical value; the evaluation of the resultant of the axial forces exerted on the rod is carried out by measuring the current consumed by the electric machine operating as a motor, and the detection of a variation in the resultant of the forces exerted on the rod is carried out by the detection a variation in the current consumed by the electric machine operating as a motor. Other objects and advantages of the invention will become apparent in the light of the description of an embodiment, given hereinafter with reference to the accompanying drawings, in which: FIG. 1 is a schematic view of a machine for manufacturing containers by stretch blow molding from plastic preforms, this machine being equipped with a plurality of forming stations; Figure 2 is a partial perspective view illustrating a forming station equipping a machine as shown schematically in Figure 1; Figures 3 and 4 are detail views illustrating the forming station in two different positions of the drawing rod; FIGS. 5, 6 and 7 are diagrams on which are plotted, from top to bottom and according to three embodiments: a curve illustrating the variations of vertical position of the rod; a timing diagram illustrating the movement control of the mold bottom; a curve illustrating the variations of the forces applied to the rod; a curve illustrating the variations of the electric current consumed by the electrical machine to which the rod is coupled. FIG. 1 partially shows a plant 1 for manufacturing containers by stretch blow molding from plastic blanks (in particular PET). The blanks may be preforms, formed by injection of the plastic material, or intermediate containers formed from the blanks but which, not having the shape of the final containers, are intended to undergo one or more finishing operations, including including a blowing operation. This installation 1 comprises a thermal conditioning unit, in which the blanks run past to be heated to a temperature above the glass transition temperature of the material (about 80 ° C. for PET), and a forming unit 2 (Diagrammatically in Figure 1) to which the blanks are transferred from the thermal conditioning unit to be shaped by stretch blow molding.
    [0009] As shown schematically in Figure 1, the forming unit 2 comprises at least one station 3 for forming a container by stretch blow molding. In practice, the forming unit 2 comprises in fact a rotating carousel or wheel 4, and a series of forming stations 3 mounted on the wheel 4, at the periphery thereof. According to a preferred embodiment, the forming unit 2 comprises a sensor 5 of the instantaneous angular position of the wheel, in the form of, for example, an encoder (that is to say, in practice, an instrumented bearing). . The installation comprises a control system which automatically controls its operation, in the form of a computerized central control unit 6, and controllers (for example of the API type - acronym for an industrial PLC) equipped with actuators driving individually each forming station 3. Each forming station 3 comprises, in the first place, a mold 7 provided with a wall 8 defining a cavity 9 at the impression of the container to be formed, which extends along a main axis 10, and a bottom 11 of mold with a surface 12 greater than the footprint of the container to be formed. The mold 7 is for example of the wallet type and comprises two half-molds articulated around a common hinge and which open to allow, successively, the evacuation of a shaped container and the introduction of a previously heated preform in the thermal conditioning unit. The wall 8 has, in a lower part, an opening 13 defining a passage for the bottom 11 of the mold, which is mounted axially displaceable relative to the wall 8 between: an extended position, in which the bottom 11 of the mold is removed from the cavity 9 (Figures 2, 3), and a retracted position in which the mold base 11 closes the cavity 9 by closing the opening 13, the upper surface 12 thus completing the impression of the container to be formed (Figure 4). The mobility of the mold base 11 allows, during a boxing operation consisting, from the extended position, to move the bottom 11 of mold to its retracted position during the blowing of the container, to achieve on the bottom of the an important stretching of the material which, by increasing its crystallinity, has an increased structural rigidity.
    [0010] Each forming station 3 comprises, secondly, a device 14 for controlling the displacement of the mold base 11, able to exert on it an axial thrust to move it from its extended position to its retracted position, and vice versa.
    [0011] This control device 14 comprises, for example, a jack 15 on which the bottom 11 of the mold is mounted, this jack 15 being connected to a source 16 of fluid (for example at a pressure used for blowing the containers) through a solenoid valve 17 controlled by the central control unit 6.
    [0012] Each forming station 3 comprises, secondly, a drawing device 18 equipped with a frame 19 fixed to the wheel 4 and extending substantially vertically above the mold 7. The drawing device 18 comprises a drawing rod 20 movable relative to the frame 19 (and therefore relative to the mold 7) and intended to maintain the container being formed in the axis 10 of the mold 7, and an electric machine 21 coupled to the rod 20 to ensure, under certain conditions, the displacement. The electrical machine 21 is connected to the central control unit 6 which provides control by AC power via an electric circuit 22. More specifically, according to an embodiment illustrated in the figures, the drawing device 18 comprises a carriage 23 slidably mounted relative to the frame 19, and on which the rod 20 is fixed by an upper end.
    [0013] The electric machine 21 is for example a linear (asynchronous) induction motor comprising: a linear stator 24 integral with the frame 19, supplied with current to produce a magnetic field under the control of the central control unit 6, - a rotor 25 linear integral with the carriage 23, mounted facing the stator 24 and formed for example of a plate of a metallic material such as copper, iron or aluminum. Through the carriage 23, the rod 20 is thus mounted movable relative to the frame 19 (and therefore relative to the mold 7) between - an extreme high position (Figure 2 and dashed in Figure 3) in which the rod 20 is completely out of the mold 7, an extreme low position (solid line in Figure 3) in which the rod 20 is received in the mold 7 by coming into contact with the mold base 11, itself being in the extended position. The electric machine 21 can operate in two modes: a motor mode, in which the machine 21 is supplied with current, the stator 24 then producing a magnetic field which, by induction, generates on the rotor 25 (and on the carriage 23 and the rod 20) an electromotive force which tends to move it; a generator mode, in which the supply of the stator 24 in alternating current is cut off, and in which the forced displacement of the rod 20 (and thus of the carriage 23) creates a contrario in the rotor 25 a magnetic field which induces in the circuit 22 electrical power supply of the stator 24 an electric current, which in turn generates a magnetic field in the stator 24 and a counter-electromotive force which opposes the forced displacement of the rod 20. It is called boxing race the distance between the position exited from the retracted position of the mold bottom 11. The boxing race varies from one container to another, especially depending on the shape of the bottom and the diameter (which depends on the capacity itself) of the container. Theoretically, the boxing run is set manually by the operator responsible for setting up the installation 1. This adjustment can for example be made directly at the jack 15 by mounting or by adjusting end stops.
    [0014] However, it is not enough to set the installation assuming that each forming station 3 has been correctly set. Indeed, the operator may have made an error on at least one of the forming stations 3, or even forgot to make the adjustment during a change of container reference to manufacture.
    [0015] This is why it is desirable to determine the boxing run for each forming station 3 prior to the start of production, in order to verify that this race corresponds to a predefined theoretical stroke (and for example stored in the central unit 6 of FIG. control) for which the manufacture of the containers can be judged optimal. It is theoretically possible to directly instrument the bottom 11 of the mold to identify the position of the bottom 11 in the extended position and in the retracted position and thus deduce, by difference, the boxing race. However, in many configurations of the installation, the environment of the mold bottom 11 is not conducive to such an instrumentation, due in particular to the vibrations of which the bottom 11 of the mold and its jack 15 are affected, unfavorable thermal conditions ( high or fluctuating temperature), or possible moisture resulting from fluid leaks (even minimal) to the connections between the mold 7 and heat transfer fluid supply circuits for heating the wall 8 and / or the bottom 11 of mold.
    [0016] This is why it is envisaged, during the setting up of the installation 1, to calculate the boxing stroke of each forming station 3, prior to the start of production, by means of its drawing rod 20, for check, by simple comparison, its conformity to the predefined theoretical course.
    [0017] Thus, the setting of the installation 1 including the verification of the boxing race is carried out as follows. In summary, starting from the extreme high position: it brings the rod 20 in contact with the mold bottom 11, which is in its extended position or in its retracted position; - Is assigned to the rod 20 a so-called original position; the movement of the mold base 11 is controlled; by making sure of the contact of the rod 20 with the bottom 11 of the mold after the displacement thereof, the corresponding position of the rod 20 is then determined; - Then calculates the difference between the raised position of the rod 20 and the original position, which provides the distance traveled by the rod 20 during the movement of the bottom 11 mold, and thus the boxing race. In practice, one can proceed in several different ways.
    [0018] In the following, three are presented with reference to FIGS. 5, 6 and 7, respectively. A first embodiment is described (FIG. 5), starting from an initial configuration in which the rod 20 (whose position is noted Z on the ordinate axis) is in a high position spaced from the bottom 11 of the mold (in practice, in its extreme high position) and in which the bottom 11 of the mold is in its extended position.
    [0019] In FIG. 5, the diagrams are plotted on marks whose abscissa axis is a time axis (denoted by t). In stationary operation of the installation 1, the time is relative and is equivalent to the angular position of the wheel 4, which is measured by means of the angular position sensor 5. It should be noted that the diagrams of FIG. 5 are provided to illustrate the different phases of the process, but do not necessarily correspond to measurements made. This is so, in particular, the position of the rod 20. The initial configuration corresponds to the zone A on the 10 synchronized diagrams of FIG. 5. The solenoid valve 17 for controlling the displacement of the bottom 11 of the mold (the position the solenoid valve 17 is denoted EV in the diagram of FIG. 5) is closed (position CL); the current (noted i) consumed by the electric machine 21 is zero. The resultant (denoted R) of the axial forces exerted on the rod 20 is zero. Starting from this initial configuration, the electric motor 21 is operated from a time t0, by supplying the stator 24 with alternating electric current to exert on the carriage 23 (and thus the rod 20) a force axial drive which moves it downwards (that is to say towards the bottom 11 of the mold), which corresponds to the zone B on the diagrams of FIG. 5. The resultant of the axial forces exerted on 20. In practice, this evaluation consists in measuring the value of the current consumed by the electric machine operating in the motor. As long as the rod 20 encounters no obstacle to its descent, the consumed current is constant and corresponds to the rated current (noted II) of operation of the machine 21, necessary for the displacement of the rod 20. When the rod 20 reaches, the moment tl, the upper surface 12 of the bottom 11 of the mold, the latter forms a stop and prevents any progression of the rod 20. The resultant of the axial forces on the rod 20 then varies abruptly to cancel, the force exerted by the bottom 11 of mold on the rod 20 being equal in absolute value to the force exerted by the motor formed by the machine 21 on the rod 20 but of opposite sign. This results in a variation in the current consumed by the electric machine operating as a motor. More precisely, the current consumed increases sharply. I2 is the maximum value reached. As soon as this variation of the consumed current is detected, the following operations are performed, their important order little (these operations may even be simultaneous): the rod 20 is assigned an original ZO position (which may be of zero value), which corresponds here to the low position of the mold base 11, and this position is stored (for example in a memory integrated in the central control unit 6); the axial driving force is stopped on the rod 20, in this case by ceasing to operate the electric machine 21 as a motor (in other words, by ceasing to supply it with electric power), and its operation is switched to generator mode. This phase is denoted by C in the diagrams of FIG. 5. The movement of the mold base 11 towards its retracted position is then controlled by opening the solenoid valve 17 (position OP in FIG. 5). In the absence of force exerted by the electric machine 21 on the rod 20, the bottom 11 of the mold causes the latter in its displacement, from the moment t2 (which is shown slightly later than the order displacement of the mold bottom 11, to materialize the response time of the solenoid valve 17). The rod 20 is however not completely free since, as we have seen, its displacement creates in the power supply circuit 22 of the machine 21 an induced current which generates a counter-electromotive force, directed axially in the opposite direction the force exerted by the bottom 11 mold but substantially lower in absolute value than it. This phase is denoted D on the diagrams of FIG. 5. It can be seen that instead of consuming current, the machine 21 produces it (the value of the current thus produced is noted as 13). The corresponding final position, noted Z1, of the rod 20 is then determined, then the distance E (called the stroke of the rod) is calculated and stored between this final position and the original position of the rod 20: E = 1Z1 - ZO1 If the instant, noted t3, where the bottom 11 of mold reaches its retracted position, is not known, it is nevertheless possible to estimate its minimum value 35 taking into account the durations observed by means of preliminary boxing tests .
    [0020] It is therefore possible to provide, from time t2, a predetermined time delay preceding the determination of the position of the rod 20 supposed to correspond to the end of travel of the mold base 11. The thus calculated value of the gap E then corresponds to the boxing race, starting from the assumption (generally verified in practice) that the rod 20 is kept in permanent contact with the mold bottom 11. A second embodiment will now be described, starting from an initial configuration in which the rod 20 is in a position at a high distance from the bottom 11 of the mold (in practice, in its extreme high position) and in which the bottom 11 of the mold mold is in its retracted position. In FIG. 6, constructed in the same manner as FIG. 5, the diagrams are plotted on landmarks whose abscissa axis is a time axis (denoted by t). In stationary operation of the installation 1, the time is relative and is equivalent to the angular position of the wheel 4, which is measured by means of the angular position sensor 5. The initial configuration corresponds to the zone A 'on the synchronized diagrams of FIG. 6. The solenoid valve 17 for controlling the displacement of the mold base 11 is open (position OP); the current consumed by the electric machine 21 is zero. The resultant axial forces exerted on the rod 20 is zero. Starting from this initial configuration, the electric motor 21 is operated from the moment t0 by supplying the stator 24 with alternating electric current to exert on the carriage 23 (and therefore the rod 20) a force axial drive which moves it downwards (that is to say towards the bottom 11 of mold), which corresponds to the zone B 'on the diagrams of FIG. 6. The resultant of the axial forces exerted on In practice, this evaluation consists in measuring the value of the current consumed by the electric machine 21 operating as a motor. As long as the rod 20 encounters no obstacle to its descent, the consumed current is constant and corresponds to the nominal operating current (noted il) of the machine 21, necessary for the displacement of the rod 20. When the rod 20 reaches, at moment tl, the upper surface 12 of the mold bottom 11, the latter forms a stop and prevents any progression of the rod 20. The resultant of the axial forces on the rod 20 then varies abruptly to cancel, the force exerted by the bottom 11 of mold on the rod 20 being equal in absolute value to the force exerted by the motor formed by the machine 21 on the rod 20 but of opposite sign.
    [0021] This results in a variation in the current consumed by the electric machine 21 operating as a motor. More precisely, the current consumed increases sharply. I2 is the maximum value reached. As soon as this variation of the consumed current is detected, the following operations are carried out, their important order little (these operations may even be simultaneous): the rod is assigned an original ZO position (which may be of zero value), which corresponds here to the high position of the mold base 11, and this ZO position is stored (for example in a memory integrated in the central control unit 6); the axial driving force is stopped on the rod 20, in this case by ceasing to operate the electric machine 21 as a motor (in other words, by ceasing to supply it with electric power), and its operation is switched over in generator mode.
    [0022] This phase is noted C 'on the diagrams of Figure 6. It then controls the movement of the bottom 11 mold to its extended position, closing the solenoid valve 17 (position CL in Figure 6). After a delay, taking into account the response time of the solenoid valve 17 and the presumed time of displacement of the mold base 11, the motor 21 is again powered from the instant t2 onwards. the stator 24 AC electric current to exert on the carriage 23 (and thus the rod 20) an axial driving force which moves it downwards (that is to say towards the bottom 11 of mold), which corresponds to the zone C '.
    [0023] The resultant of the axial forces exerted on the rod 20 is evaluated in the same manner as above. As long as the rod 20 encounters no obstacle to its descent, the consumed current is constant and corresponds to the nominal operating current (noted il) of the machine 20, necessary for the displacement of the rod 20.
    [0024] When the rod 20 reaches, at time t3, the upper surface 12 of the mold base 11, the latter forms a stop and prevents any progression of the rod 20. The resultant of the axial forces on the rod 20 then varies abruptly for cancel, the force exerted by the mold bottom 11 on the rod 20 being equal in absolute value to the force exerted by the motor 21 on the rod 11 but of opposite sign. This phase is denoted D 'in FIG.
    [0025] This results in a variation in the current consumed by the electric machine 21 operating as a motor. More precisely, the current consumed increases sharply. The value i2 is the same as before. As soon as this variation of the consumed current is detected, the following operations are carried out, their important order being few (these operations may even be simultaneous): a final Z1 position is assigned to the rod, which corresponds here to the output position of the bottom 11 of mold, and this position Z1 is stored (for example in a memory integrated in the central control unit 6); the axial driving force is stopped on the rod 20, in this case by ceasing to operate the electric machine 21 as a motor (in other words, by ceasing to supply it with electric power), and its operation is switched over in generator mode.
    [0026] Then calculates and stores the distance E (called the stroke of the rod) between this final position and the original position of the rod 20, which corresponds to the boxing race: E = 1Z1 - ZO1 A third mode is described embodiment (FIG. 7), starting from an initial configuration in which the rod 20 (whose position is denoted Z on the ordinate axis) is in a position at a distance from the bottom 11 of the mold (in practice, in its extreme high position) and in which the bottom 11 of the mold is in its extended position (but, alternatively, it could be in the retracted position).
    [0027] In FIG. 7, the diagrams are plotted on landmarks whose abscissa axis is a time axis (denoted by t). In stationary operation of the installation 1, the time is relative and is equivalent to the angular position of the wheel 4, which is measured by means of the angular position sensor 5. It should be noted that the diagrams of FIG. 7 are provided to illustrate the different phases of the process, but do not necessarily correspond to measurements made. This is so, in particular, the position of the rod 20.
    [0028] The initial configuration corresponds to the zone A "on the synchronized diagrams of FIG. 7. The solenoid valve 17 for controlling the displacement of the mold base 11 (the position of the solenoid valve 17 is denoted EV in the diagram of FIG. 7) is closed (position CL) (alternatively, the solenoid valve 17 could be open (position OP), the current (noted i) consumed by the electric machine 21 is zero The resultant (denoted R) of the axial forces exerted on the rod 20 Starting from this initial configuration, starting from a moment t0, the electric motor 21 is powered, by supplying the stator 24 with alternating electric current to exert on the carriage 23 (and thus the rod 20) an axial driving force which moves it downwards (that is to say towards the bottom 11 of the mold), which corresponds to the zone B "on the diagrams of FIG.
    [0029] The resultant of the axial forces exerted on the rod 20 is then evaluated. In practice, this evaluation consists in measuring the value of the current consumed by the electric machine 21 operating as a motor. As long as the rod 20 encounters no obstacle to its descent, the consumed current is constant and corresponds to the rated current (noted II) of operation of the machine 21, necessary for the displacement of the rod 20. When the rod 20 reaches, the moment tl, the upper surface 12 of the mold bottom 11, the latter forms a stop and prevents any progression of the rod 20. The resultant of the axial forces on the rod 20 then varies abruptly to cancel, the force exerted by the bottom 11 of mold on the rod 20 being equal in absolute value to the force exerted by the motor 21 on the rod 20 but of opposite sign. This results in a variation in the current consumed by the motor formed by the electric machine 21 operating as a motor. More precisely, the current consumed increases sharply. I2 is the maximum value reached. As soon as this variation of the consumed current is detected, the following operations are performed, their important order little (these operations may even be simultaneous): the rod 20 is assigned an original ZO position (which may be of zero value), which corresponds here to the low position of the mold base 11, and this position is stored (for example in a memory integrated in the central control unit 6); it controls the movement of the rod 20 to replace it in the high position by means of the electric machine 21 still operating as a motor, and then (after a delay) the movement of the mold base 11 towards its retracted position (or, in variant, towards its extended position), by opening (respectively closing) the solenoid valve 17 (OP position - respectively CL position - in Figure 7). In FIG. 7, t2 is the moment at which the rod 20 reaches its high position. In an arbitrary manner, there is shown the control opening (respectively closing) of the solenoid valve slightly in advance of the instant t2 This phase is noted C "on the diagrams of Figure 7. When the rod 20 reaches its position high, it switches the operation of the electric machine 21 generator, which blocks the rod 20 in position.After a delay (possibly corresponding to a complete revolution of the wheel 4, phase D "), during which the rod 20 is maintained in its upper position by the machine 21 and in which the bottom 11 of the mold is held in its retracted position (respectively output), it is again controlled, from a time noted t3, the displacement of the rod 20 to the bottom of the mold by reversing the operation of the electric machine 21 as a motor (phase E "), the resultant of the axial forces exerted on the rod 20 is then evaluated, as previously indicated. the current consumed is constant and corresponds to the rated current (noted 11) of operation of the machine 21, necessary for the displacement of the rod 20. When the rod 20 reaches, at time t4, the upper surface 12 of the mold base 11, the latter forms a stop and prevents any progression of the rod 20. The resultant axial forces on the rod 20 then suddenly changes again to cancel, the force exerted by the bottom 11 of mold on the rod 20 being equal in absolute value to the force exerted by the motor formed by the machine 21 on the rod 20 but of opposite sign.
    [0030] This results in a variation in the current consumed by the electric machine 21 operating as a motor. Specifically, the current consumed increases sharply to reach i2 again.
    [0031] As soon as this variation of the consumed current is detected, a final position Z1 is assigned to the rod 20, which corresponds here to the high (respectively low) position of the mold base 11, and this position is stored (for example in an integrated memory to the Central Control Unit 6). Then calculate and store the travel E of the rod 20, which corresponds, as before, the boxing race: E = 1Z1 - ZO1 It results from the parameterization process presented above a number of advantages. Firstly, even before starting the production, it is easy to check, when setting up the installation 1 that the actual boxing stroke corresponds, on each forming station 3, to the theoretical stroke corresponding to the model of container to be formed.
    [0032] Secondly, it is not necessary to instrument the mold bottom 11 since the information can be obtained indirectly via the drawing rod. Thirdly, the information thus obtained is reliable, since the rod 20 and the bottom 11 of the mold are contiguous during the entire time of the movement of the mold base 11 from its extended position to its retracted position (or reciprocally). This results in a decrease in the risk of defect (or even malformation) affecting the containers due to an adjustment error of the installation I.
    [0033] Since the verification of the boxing run can be carried out systematically and automatically during the start-up of the installation 1 before the start of production, the parameter setting errors during the reference changes are thus limited.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Method for parameterizing a plant (1) for manufacturing containers by stretch blow molding from plastic blanks, this installation (1) comprising: - a mold (7) provided with a wall (8) defining a cavity (9) to the impression of the container, extending along a main axis (10) of the mold and a bottom (11) of mold axially displaceable relative to the wall (8) between an extended position and a retracted position - A device (14) for controlling the movement of the bottom (11) mold, able to exert on the bottom (11) of the mold an axial thrust to move it from its extended position to its retracted position and vice versa; - a drawing device (18) comprising a drawing rod (20) displaceable axially relative to the wall (8) and an electric machine (21) coupled to the rod (20); this method being characterized in that it comprises the operations consisting, from an initial configuration in which the rod (20) is in a position spaced apart from the bottom (11) of the mold and in which the bottom (11) of mold is in its extended position or in its retracted position, to: operate the motor machine (21) motor to exert on the rod (20) an axial driving force which moves it to the bottom (11) of the mold; evaluating the resultant of the axial forces exerted on the rod (20); when a variation in the resultant of the forces is detected, assigning to the rod (20) a position (ZO) of origin; memorize the original position (ZO); - Control the movement of the bottom (11) of mold to its retracted position or, respectively, its extended position; assigning to the rod the corresponding (Z1) final position of the rod (20); calculate and memorize the difference (E), called the stroke of the rod (20), between the final position (Z1) and the position (ZO) of origin.
    [0002]
    2. Method according to claim 1, characterized in that, in the initial configuration, the bottom (11) of the mold is in its extended position.
    [0003]
    3. Method according to claim 1 or claim 2, characterized in that it comprises, between the operation of storing the position (ZO) of origin and the movement control of the bottom (11) of the mold, an operation of placing the rod (20) in the up position.
    [0004]
    4. Method according to claim 3, characterized in that it comprises, after the control operation of the movement of the bottom (11) of the mold, the operations of: the machine (21) electric running motor, move the rod (20) from its upward position to the bottom (11) of the mold; evaluating the resultant of the axial forces exerted on the rod (20); when a variation in the resultant of the forces is detected, to assign to the rod (20) its final position (Z1).
    [0005]
    5. Method according to claim 2, characterized in that it comprises, between the operation of storing the position (ZO) of origin and the movement control of the bottom (11) mold, an operation consisting of ceasing apply the axial driving force on the rod (20).
    [0006]
    6. Method according to claim 5, characterized in that the cessation of the application of the axial driving force on the rod (20) is achieved by the cessation of the operation of the machine (21) electric motor.
    [0007]
    7. Method according to claim 6, characterized in that, after the cessation of the use of the machine (21) motor and before the control movement of the bottom (11) mold, the machine (21) is electric switched to work as a generator.
    [0008]
    8. Method according to one of the preceding claims, characterized in that it comprises, after controlling the movement of the bottom (11) mold, a predetermined time delay.
    [0009]
    9. Method according to one of the preceding claims, characterized in that it comprises a comparison operation of the stroke of the rod (20) with a predetermined theoretical value.
    [0010]
    10. Method according to one of the preceding claims, characterized in that the evaluation of the resultant axial forces exerted on the rod (20) is achieved by measuring the current consumed by the machine (21) electric running motor, and the detection of a variation in the resultant of the forces exerted on the rod (20) is achieved by detecting a variation in the current consumed by the electric machine (21) operating as a motor.
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    同族专利:
    公开号 | 公开日
    FR3023503B1|2016-07-29|
    EP3166772B1|2018-01-24|
    US10343327B2|2019-07-09|
    CN106660254A|2017-05-10|
    CN106660254B|2019-04-19|
    JP6621801B2|2019-12-18|
    WO2016005682A1|2016-01-14|
    EP3166772A1|2017-05-17|
    US20170157834A1|2017-06-08|
    JP2017524569A|2017-08-31|
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    WO2012156614A1|2011-05-19|2012-11-22|Sidel Participations|Method for the stretch-blowing of a container, comprising a retraction of the stretch rod during a boxing operation|
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    FR2998207B1|2012-11-20|2015-01-16|Sidel Participations|METHOD OF STRETCH BLOWING A CONTAINER, COMPRISING A MEASUREMENT OF THE SHIFT OF THE STRETCH ROD DURING A BOXING OPERATION|FR3063926B1|2017-03-17|2019-04-12|Sidel Participations|METHOD FOR AUTOMATICALLY ADJUSTING THE RUNNING OF A STRETCH ROD OF A HOLLOW BODY FORMING DEVICE|
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    法律状态:
    2015-06-25| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-15| PLSC| Search report ready|Effective date: 20160115 |
    2016-06-22| PLFP| Fee payment|Year of fee payment: 3 |
    2017-06-21| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-21| PLFP| Fee payment|Year of fee payment: 5 |
    2020-04-10| ST| Notification of lapse|Effective date: 20200306 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1456739A|FR3023503B1|2014-07-11|2014-07-11|MEASURING THE BOXING RACE BY THE STRETCH FUNCTION IN A CONTAINER MANUFACTURING FACILITY|FR1456739A| FR3023503B1|2014-07-11|2014-07-11|MEASURING THE BOXING RACE BY THE STRETCH FUNCTION IN A CONTAINER MANUFACTURING FACILITY|
    US15/325,509| US10343327B2|2014-07-11|2015-07-02|Measurement of the boxing travel by the stretching function, in an installation for producing containers|
    CN201580037362.0A| CN106660254B|2014-07-11|2015-07-02|Pass through the measurement of the impact stroke of drawing effect in container manufacturing facility|
    EP15745538.7A| EP3166772B1|2014-07-11|2015-07-02|Measurement of the boxing travel by the drawing function, in a facility for producing containers|
    JP2017501306A| JP6621801B2|2014-07-11|2015-07-02|Measurement of boxing process by stretching function in container manufacturing facility|
    PCT/FR2015/051828| WO2016005682A1|2014-07-11|2015-07-02|Measurement of the boxing travel by the drawing function, in a facility for producing containers|
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