• 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:
    Hydraulic drive device (3), in particular for a forming machine, with at least one motor (4), in particular an electric motor, at least one first hydraulic pump (1) which is drivable by the at least one motor (4) and at least one flywheel (5) wherein at least one second hydraulic pump (2) is provided, which is connected or connectable to the at least one flywheel (5), and that a hydraulic connecting line (6) is provided between the first and the second hydraulic pump (2).
    公开号:AT517070A4
    申请号:T50863/2015
    申请日:2015-10-08
    公开日:2016-11-15
    发明作者:Anton Ing Lohnecker；Helmut Ing Steinparzer；Herbert Dipl Ing Zeidlhofer
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a hydraulic drive device, in particular for a shaping machine, with at least one motor, in particular electric motor, at least one first hydraulic pump, which is drivable by the at least one motor, and at least one flywheel. Furthermore, the invention relates to a molding machine with such a hydraulic drive device and a method for operating a hydraulic drive device.
    Flydraulic drive devices are usually designed so that one or more motor-pump unit (s) can cover all the required services in one working cycle. It is usually taken into account that electric motors can be operated in the short term well above their nominal load.
    However, if a higher performance is required only once in a single work cycle, this usually has to be achieved with additional or more powerful motors and / or pumps, which means that the total connected load of the system also increases.
    Alternatively, hydraulic accumulators are often used for such cases, which are loaded during the break times and to cover the peak loads, the stored under pressure hydraulic oil is removed again. Here the disadvantage lies clearly in the poor efficiency and thus higher energy consumption. But the additional and regularly required safety checks of the memory are not popular with users.
    A drive device with electric motor, hydraulic pump and flywheel is known from DE 197 01 671 B4. This is suitable for carrying out different work cycles with varying power requirements. This is achieved in that the electric motor is connected to a rotor shaft of the hydraulic pump via an interruption of the torque transmission enabling clutch and that one
    Power output of the electric motor in response to falling below and exceeding each predetermined rotational speed of the flywheel increasing or decreasing control device is provided. The disadvantage here is that, among other things, a complex mechanical coupling is necessary for the change of the power output.
    DE 10 2010 035 283 A1 shows a hydraulic drive device, wherein a frequency-controlled drive motor via its motor shaft permanently fixed to (at least) a flywheel and (at least) an unregulated hydraulic pump is connected. This allows a maximum torque output at any speed. The disadvantage here is, inter alia, that the drive motor is constantly connected to the flywheel. Thus, a dependency between the drive motor, hydraulic pump and flywheel is permanently given.
    The object of the present invention is therefore to provide a comparison with the prior art improved hydraulic drive device.
    This is achieved by a hydraulic drive device having the features of claim 1. Preferred embodiments are specified in the subclaims. According to the invention, the hydraulic drive device has at least one second hydraulic pump, which is connected or connectable to the at least one flywheel, and a hydraulic connecting line between the first and the second hydraulic pump. This makes it possible that the second hydraulic pump can be used in addition to the flywheel at peak loads. Thus, the efficiency of the entire hydraulic drive device is significantly improved.
    According to a preferred embodiment, a first hydraulic switching element is provided, through which the hydraulic connecting line between the first and the second hydraulic pump can be shut off. The great advantage of this solution in comparison to DE 197 01 671 B4, where a motor-pump flywheel unit is described, is the fact that the energy stored via the flywheel can be called up by means of a simple switching element (eg a hydraulic valve) instead of using complex and mechanical couplings. Two variants are possible for the design of the pumps. According to a first variant, it is provided that the at least one first hydraulic pump and / or the at least one second hydraulic pump are designed to be variable in stroke volume. Thus, the delivery volume can be adjusted or changed. It is particularly preferred for this purpose that the stroke volume of the at least one second hydraulic pump is variable between a loading position and an unloading position for loading or unloading the flywheel. Thus, it is possible, for example, for the first hydraulic pump, a relatively small motor is used, whereby the loading of the flywheel via the connecting line and the second pump can be done relatively slowly. For unloading the stroke volume of the second pump can be relatively large, which can be supplied by connecting the second pump and flywheel of the consumer with a large amount of hydraulic fluid.
    According to a second variant, it is provided that the at least one first hydraulic pump and / or the at least one second hydraulic pump are / is designed as a fixed displacement pump. Thus, in this pump or these pumps always the same volume per unit time promoted. For the engine is preferably provided that this is designed as a variable speed motor. This speed is signed, so therefore the direction of rotation is changeable.
    Furthermore, it is preferably provided that the at least one motor and the at least one first hydraulic pump are coupled by a common shaft.
    According to a further preferred embodiment, it is provided that the hydraulic drive device has a control or regulation unit. By this control or regulating unit, the motor, the first hydraulic pump, the second hydraulic pump and / or the first switching element can be controlled or regulated. Preferably, a single control or regulating unit is provided, through which all components of the hydraulic drive device can be controlled.
    Particularly preferably, the control unit can be used to couple the at least one first hydraulic pump via the first hydraulic switching element with the at least one second hydraulic pump, so that hydraulic fluid through the at least one first hydraulic pump to at least a second hydraulic pump can be conveyed is. In a first phase, a displacement of the second hydraulic pump is adjustable by the control or regulating unit such that this second hydraulic pump operates as a hydraulic motor and thereby accelerates the flywheel. In a second phase, a displacement of the second hydraulic pump is adjustable by the control or regulating unit such that this second hydraulic pump operates as (support) pump and is driven by the flywheel.
    The two pumps can deliver the hydraulic fluid into a common hydraulic line. In principle, it is also possible for the at least two pumps (each in individual operation) to supply separate systems. It is preferably provided that the at least one first and the at least one second hydraulic pump are connected in parallel. It is preferably provided that the flow direction of the hydraulic fluid in the parallel circuit by changing the speed of the motor and / or by changing the pivot angle of the at least one first hydraulic pump and / or by a switched between the engine and the first hydraulic pump gearbox is switchable. For this purpose, it can be provided that the flow direction of the hydraulic fluid in the parallel circuit by a second hydraulic switching element, preferably a 4/3-way valve, is switchable. The switching is preferably carried out by the control unit (not manually). In the parallel circuit can further be provided a feed pump and / or a pressure accumulator, through which the parallel circuit can be acted upon with pressure. As a result, a pressure in the parallel circuit can be built so that no cavitation occurs. The accumulator may be in the form of a bladder accumulator, a piston-cylinder unit or the like.
    In principle, the first and the second pump may be identical (that is, identical in construction). However, in order to ensure efficient adaptation to the conditions in the respective hydraulic drive device, the first pump and the second pump, preferably with respect to their maximum speed, may be different.
    In order to ensure the most accurate and rapid influencing in the operation of the hydraulic drive device, a sensor is provided, through which a characteristic of the speed of the flywheel and / or the second pump signal can be detected. By the control or regulating unit, which is fed to the signal characteristic of the speed of the flywheel, are by controlling the at least one first pump and / or by controlling or regulating the at least one second pump and / or by controlling or regulating the motor Fluctuations in the volume flow of the hydraulic fluid compensated.
    In other words, in the present invention, a motor-pump unit is used to drive at least one consumer. In this case, the motor-pump unit can be connected via the first hydraulic switching element with an additional second hydraulic pump, which in turn (only) can be coupled or coupled with a flywheel. That is, the first hydraulic pump can bring the second hydraulic pump with the associated flywheel to a desired speed and thus bring an additional hydraulic drive axle to power. If now a higher power than the (first) motor-pump combination is required, this can be switched on via the same switching valve. In this case, the conveying direction of the second pump should be reversed, which could be realized in the simplest case with a variable displacement pump and an inverted Schwenkwinkelauslenkung. Of course, other variants of the "flow reversal" are conceivable (eg switching over hydraulic valves of suction pressure line, ...). The hydraulic power could theoretically be doubled without increasing the connected load. The hydraulic power can not only be doubled but also multiplied if, for example, the second hydraulic pump is many times larger than the first hydraulic pump or can drive higher speeds than the first hydraulic pump. By arranging several second hydraulic pumps with flywheels that are sequentially "charged", the peak hydraulic power could even be multiplied.
    Protection is also desired for a shaping machine, in particular injection molding machine, which has at least one consumer, wherein this consumer can be driven by a hydraulic drive device according to the invention. Such a consumer may for example be a hydraulic actuator, in particular a hydraulic cylinder or a hydraulic motor.
    The object according to the invention is also achieved by a method having the features of claim 18. Accordingly, the hydraulic fluid, preferably a hydraulic oil, is conveyed between the first and second hydraulic pumps via the connecting line. Also in this method, the hydraulic drive device preferably has a first hydraulic switching element, by which the hydraulic connection line between the first and the second hydraulic pump can be shut off. In addition, preferably a control or regulating unit is provided, through which the first hydraulic switching element is driven, and wherein the at least one first hydraulic pump is coupled via the first hydraulic switching element with the at least one second hydraulic pump by the control or regulating unit, whereby the Step conveying the hydraulic fluid between the at least one first hydraulic pump and the at least one second hydraulic pump depending on the switching position of the first hydraulic switching element is possible.
    More specifically, in the method, the sequential steps of accelerating the flywheel and driving the second hydraulic pump are performed by the flywheel. The acceleration is carried out by the displacement of the second hydraulic pump is adjusted by the control or regulating unit such that it works as a hydraulic motor for accelerating the flywheel. The driving of the second hydraulic pump by the flywheel takes place by adjusting the displacement of the second hydraulic pump via the control or regulating unit. All preferred embodiments of the hydraulic drive device apply mutatis mutandis to the process and vice versa.
    Further details and advantages of the present invention will be explained in more detail below with reference to the description of the figures with reference to the exemplary embodiments illustrated in the drawings. Show:
    1 schematically shows a hydraulic drive device when loading the flywheel,
    2 shows schematically the hydraulic drive device with flywheel when storing,
    3 shows schematically the hydraulic drive device during removal from the individual systems,
    4 schematically shows the hydraulic drive device when removed from the overall system,
    5 schematically shows a hydraulic drive device with a plurality of flywheels and connecting lines,
    Fig. 6a & 6b schematically a hydraulic drive device with parallel connection in different switching positions,
    7 shows schematically a hydraulic drive device in storage operation,
    Fig. 8 shows schematically a supercharged hydraulic drive device and
    9 shows schematically a charging hydraulic drive device.
    In Fig. 1, a basic version of a hydraulic drive device 3 is shown. The first hydraulic pump 1 is driven by a motor 4, preferably by an electric motor (or a hydraulic motor) via a shaft 8. At least one further (second) hydraulic pump 2 is provided, whose axis is connected to a mechanical flywheel 5 instead of the usual electric motor. Furthermore, a connecting line 6 (with a hydraulic switching element 7) is provided in order to connect the first pump 1 and the pump 2 hydraulically. Each of the two pumps 1 and 2 is in line communication with a tank 13 hydraulic fluid (Of course, instead of two separate tanks 13 and only one tank 13 may be provided). The arranged in or on the connecting line 6 switching element 7 is connected to a control or regulating unit 9 in signaling connection.
    In the loading position L shown in FIG. 1, the motor 4 drives the first pump 1. About the switching element 7, the flow of the first pump 1 is switched to the second pump 2, whereby the pump 2 is driven as a hydraulic motor and thus the second pump 2 comes with the flywheel 5 in motion and can be brought to a desired speed. With suitable dimensioning of the flywheel 5 can thus be stored with the unit of the second pump 2 and flywheel 5, a hydraulic power that can be switched according to demand of peak performance.
    In the drive unit consisting of the motor 4 and the first pump 1, it is basically irrelevant whether it is a control or fixed displacement pump or even an electric motor with a constant or variable speed. An embodiment with at least one variable degree of freedom (engine speed and / or pump swivel angle) is advantageous.
    If the second hydraulic pump 2 is designed as a control pump, there are several advantages. For example, the second hydraulic pump 2 designed as a control pump in FIG. 1 is simply brought into the negative swivel range (suction operation) and thus accelerated via the delivery flow of the first hydraulic pump 1 so that the second hydraulic pump 2 delivers the flow of the first hydraulic pump 1 back to the tank 13.
    The possibility of variable negative swivel angle of the second hydraulic pump 2 offers in the loading mode or in loading position L the advantage that the required torque for accelerating the flywheel 5 on the
    Pivoting angle of the second hydraulic pump 2 is adjustable, which provides optimum controllability when starting the flywheel 5.
    Furthermore, the second hydraulic pump 2 could have a significantly larger delivery volume than the first hydraulic pump 1, and nevertheless a charging process is possible. By way of example, a first hydraulic pump 1 at a displacement of 70 cc / rev brings a maximum of 100 l / min at 1500 rev / min. However, a double-sized second hydraulic pump with a displacement of 140 cc / rev would only swing back to -50% during the loading process. The introduced torque on the flywheel would be only half as large as if the full negative swing angle would be effective, but that would only mean that the charging process takes twice as long.
    Another advantage is that it would even be possible to bring the flywheel system to a much higher speed than the motor-pump system, by further reducing the negative feed angle of the pump 2. It is completely irrelevant whether the pump 2 is larger, equal or smaller than the pump 1.
    When storing shown in Fig. 2, the execution of the second hydraulic pump 2 as a control pump has the advantage that after the separation of the two pump systems by switching the switching element 7, the second hydraulic pump 2 can be set to zero stroke and thus in memory mode or storage position SP no unnecessary amount must be circulated. That is, the loss energy of the flywheel-pump unit is reduced to a minimum, since in the zero stroke, the hydraulic losses are the lowest. The first hydraulic pump 1 can optionally be switched off in this phase, operated on stand-by (pump in pressure control) or used for another consumer.
    After the pump-flywheel unit runs independently (without power supply) at the desired speed, at any time (as with any other pump system) via a positive swivel angle control of the second hydraulic pump 2, the hydraulic power of the pump-flywheel unit can be retrieved. This can be done separately from each individual system, whereby two different consumers (not shown) are served in parallel (Figure 3). By interconnecting first hydraulic pump 1 and second hydraulic pump 2, the available power for a consumer (not shown) can also be increased (FIG. 4). Likewise, variants are also conceivable that a motor-pump unit serves several pump flywheel systems and these can be switched together for the removal as well either selectively or operated separately (Fig. 5). It is particularly advantageous in all these systems that the valves (switching elements 7) for the charging processes are also used simultaneously for the connection and disconnection of the pump flywheel units during the removal.
    4, it should be noted that, by way of example, a sensor 12 is shown, by means of which a signal S characteristic of the rotational speed of the flywheel 5 or of the pump 2 can be detected. This signal S is forwarded to the control or regulating unit 9, which forwards corresponding control pulses to the first hydraulic switching element 7, to the first hydraulic pump 1 and / or the second hydraulic pump 2 to compensate for fluctuations in the volume flow of the hydraulic fluid. In particular, thereby a speed measurement and evaluation of the pump flywheel unit can be performed. It makes sense to equip the pump flywheel units with a speed sensor (sensor 12) on the one hand to be able to optimally control the charging process, but on the other hand at the removal (by knowing the exact speed and the swing angle of the second hydraulic pump 2) to know the exact delivery volume of the unit. Thus, it is even possible to construct a control system which keeps the delivery volume of a pump-flywheel unit constant or at a desired value, although the unit's rotational speed will inevitably drop when the power is removed. It only needs the pivot angle of the second hydraulic pump 2 are increased accordingly. The minimum delivery rate of the system is then determined by a minimum allowable speed and the maximum swing angle of the second hydraulic pump. 2
    By way of example, a pump flywheel unit is brought to 2000 rpm. When removing the speed drops to about 1500 U / min. At the same time, depending on the current actual speed, the swing angle of pump 2 is increased from 75% to 100%. Thus, the external delivery volume of the system remains constant.
    In contrast to the solution with control pump on the flywheel, the variant differs with "constant pump + flywheel" primarily by the fact that the reversal of the flow between loading and unloading is not possible by the second hydraulic pump 2 itself. It must either be switched by appropriate additional measures, the constant flow (switching of pressure and suction) or you combine an adjustable charging unit such that it can "suck away" the volume of the pump-flywheel unit entirely and thus creates a closed circuit.
    According to FIG. 6a, conveying to the consumer (not shown) takes place with 25% (Qmax / 4). Accordingly, the first hydraulic pump 1 is operated via a variable-speed motor 4 (speed V = 25%). By reversing the direction of rotation (-n max / 2), this motor-pump unit is able to completely "suck away" the delivery volume of the second hydraulic pump 2 and thus generate an external delivery volume of zero. By reducing the "negative" speed, the total delivery volume can be specifically increased.
    With maximum "positive" speed (V = 100%; -m max), the maximum delivery volume of the entire system is reached (see Fig. 6b).
    Fig. 7 shows a storage operation with a constant pump flywheel combination. "V = 0%" means that the outer flow rate is zero, "-n max" means that the first hydraulic pump 1 rotates at maximum negative speed and therefore sucks away the entire displacement of the second hydraulic pump. In addition, a feed pump 11 is provided, with which the (arranged in parallel) lines of the hydraulic drive device 3 with pressure (preferably with five bar) can be acted upon. There are also check valves 14 available.
    In a hydraulic drive device 3 with fixed displacement pump, there is also the possibility of switching over a directional valve. In this variant, shown in FIGS. 8 and 9, the oil flow of the pump 2 is switched over a corresponding second hydraulic switching element 10 such that the same direction of rotation of the second hydraulic pump 2 results in three possibilities: charging (FIG. 8), "charged" (Fig. 9 - stand-by or non-pressurized circulation) and removal (not shown). The second hydraulic switching element 10 is designed as a 4/3-way valve. In Fig. 8, an internal circuit between the flywheel 5, second hydraulic pump 2 and switching element 10 is given by the switching position of the second hydraulic switching element 10. In contrast, the engine 4 is stationary. In Fig. 9, the second hydraulic switching element 10 is in a switching position which corresponds to the loading position L, which are loaded via the motor 4, the first hydraulic pump 1 and the connecting line 6, the second hydraulic pump 2 and the flywheel 5.
    Innsbruck, on October 8, 2015
    权利要求:
    Claims (22)
    [1]
    claims
    1. Hydraulic drive device (3), in particular for a shaping machine, with - at least one motor (4), in particular electric motor, - at least a first hydraulic pump (1) which is drivable by the at least one motor (4), and - at least a flywheel (5), characterized in that - at least one second hydraulic pump (2) is provided, which is connected or connectable to the at least one flywheel (5), and that - a hydraulic connecting line (6) between the first and the second hydraulic pump (2) is provided.
    [2]
    2. Drive device according to claim 1, wherein a first hydraulic switching element (7) is provided, through which the hydraulic connecting line (6) between the first (1) and the second (2) hydraulic pump can be shut off.
    [3]
    3. Drive device according to claim 1 or 2, wherein the at least one first hydraulic pump (1) and / or the at least one second hydraulic pump (2) are designed variable in displacement volume / is.
    [4]
    4. Drive device according to claim 3, wherein the stroke volume of the at least one second hydraulic pump (2) between a loading position (L) and an unloading position (E) for the loading and unloading of the flywheel (5) is variable.
    [5]
    5. Drive device according to claim 1 or 2, wherein the at least one first hydraulic pump (1) and / or the at least one second hydraulic pump (2) are designed as a fixed displacement pump / is.
    [6]
    6. Drive device according to at least one of the preceding claims, wherein the motor (4) is designed as a variable-speed motor.
    [7]
    7. Drive device according to at least one of the preceding claims, wherein the at least one motor (4) and the at least one first hydraulic pump (1) by a common shaft (8) are coupled.
    [8]
    8. Drive device according to at least one of claims 2 to 7, wherein a control or regulating unit (9) is provided, through which the first hydraulic switching element (7) is controllable, and wherein the control or regulating unit (9) is adapted to the at least one first hydraulic pump (1) via the first hydraulic switching element (7) with the at least one second hydraulic pump (2) to couple, so that hydraulic fluid through the at least one first hydraulic pump (1) to at least one second hydraulic pump (2 ) is eligible.
    [9]
    9. Drive device according to claim 8, wherein by the control or regulating unit (9) a displacement of the second hydraulic pump (2) is adjustable such that this second hydraulic pump (2) operates as a hydraulic motor and thereby accelerates the flywheel (5).
    [10]
    10. Drive device according to claim 8, wherein by the control or regulating unit (9) a displacement of the second hydraulic pump (2) is adjustable such that this second hydraulic pump (2) operates as a pump and thereby by the flywheel (5) is drivable ,
    [11]
    11. Drive device according to at least one of the preceding claims, wherein the at least one first (1) and the at least one second (2) hydraulic pump are connected in parallel.
    [12]
    12. Drive device according to claim 11, wherein the flow direction of the hydraulic fluid in the parallel circuit by changing the rotational speed of the motor (4) and / or by changing the pivot angle of the at least one first hydraulic pump (1) and / or by an intermediate motor (4). and the first hydraulic pump (1) switched gear is switchable.
    [13]
    13. Drive device according to claim 11 or 12, wherein the flow direction of the hydraulic fluid in the parallel circuit by a second hydraulic switching element (10), preferably a 4/3-way valve, is switchable.
    [14]
    14. Drive device according to at least one of claims 11 to 13, wherein a feed pump (11) and / or a pressure accumulator are provided / is, through which the parallel circuit is pressurized.
    [15]
    15. Drive device according to at least one of the preceding claims, wherein a sensor (12) is provided, through which a for the rotational speed of the flywheel (5) and / or the second hydraulic pump (2) characteristic signal (S) can be detected.
    [16]
    16. Drive device according to claim 15, wherein a control or regulating unit (9) is provided, to which the characteristic signal (S) can be supplied, wherein the control or regulating unit (9) is adapted to control by controlling the at least one first Pump (1) and / or by controlling or regulating the at least one second pump (2) and / or by controlling or regulating the motor (4) to compensate for fluctuations in the volume flow of the hydraulic fluid.
    [17]
    17. Forming machine with a drive device (3) according to at least one of claims 1 to 16.
    [18]
    18. A method for operating a hydraulic drive device (3), in particular according to one of claims 1 to 17, wherein the hydraulic drive device (3) at least one motor (4), in particular electric motor, at least one first hydraulic pump (1), which by at least a motor (4) is driven, and at least one flywheel (5), characterized in that the hydraulic drive device (3) at least one second hydraulic pump (2), which is connected to the at least one flywheel (5) or connectable and in that a hydraulic connection line (6) is provided between the first (1) and second (2) hydraulic pumps, comprising the step of conveying hydraulic fluid between the first (1) and second (2) hydraulic pumps via the connection line (6).
    [19]
    19. The method according to claim 18, characterized in that the hydraulic drive device (3) comprises a first hydraulic switching element (7) through which the hydraulic connection line (6) between the first (1) and the second (2) hydraulic pump can be shut off ,
    [20]
    20. The method of claim 19, wherein a control or regulating unit (9) is provided, through which the first hydraulic switching element (7) is driven, and wherein by the control or regulating unit (9) the at least one first hydraulic pump (1 ) is coupled to the at least one second hydraulic pump (2) via the first hydraulic switching element (7), comprising the step of: conveying the hydraulic fluid between the at least one first hydraulic pump (1) and the at least one second hydraulic pump (2) Dependence of a switching position of the first hydraulic switching element (7).
    [21]
    21. Method according to claim 20, with the step: accelerating the flywheel (5) by adjusting the displacement of the second hydraulic pump (2) via the control unit (9) such that it acts as a hydraulic motor for accelerating the flywheel ( 5) works.
    [22]
    22. The method of claim 20, comprising the step of: driving the second hydraulic pump (2) through the flywheel (5) by adjusting the displacement of the second hydraulic pump (2) via the control or regulating unit (9). Innsbruck, on October 8, 2015
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50863/2015A|AT517070B1|2015-10-08|2015-10-08|Hydraulic drive device for a molding machine|ATA50863/2015A| AT517070B1|2015-10-08|2015-10-08|Hydraulic drive device for a molding machine|
    DE102016011900.4A| DE102016011900A1|2015-10-08|2016-10-04|Hydraulic drive device for a molding machine|
    US15/287,965| US20170102011A1|2015-10-08|2016-10-07|Hydraulic drive device for a molding machine|
    CN201610877806.8A| CN106567869A|2015-10-08|2016-10-08|Hydraulic drive device for molding machine|
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