• 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 device (1) for a molding machine, in particular for an injection molding machine, having a first pump (P1) for a hydraulic fluid, at least one second pump (P2) for the hydraulic fluid, at least one drive device (M1) for the first pump (P1) and second Pump (P2), a first main line (H1), which leads away from the first pump (P1), a second main line (H2), which leads away from the second pump (P2), a first consumer (V1) via a first Opening (01) and a first secondary line (N1) to the first main line (H1) is connected and via a second opening (02) and a second secondary line (N2) to the second main line (H2) is connected, and at least a second Consumer (V2), which is connected via a third opening (03) and a third secondary line (N3) to one of the main lines (H1, H2), wherein the second consumer (V2) on the one hand via the third opening (03) and the third secondary line (N3) is connected to the first main line (H1) and on the other hand via a fourth opening (04) and a fourth secondary line (N4) to the second main line (H2) is connected. In a control or regulating device (11) for controlling or regulating the pumps (P1, P2) consumer-specific data (D) in the form of delivery volumes and / or area ratios of the consumer (V1, V2) are stored. The pumps (P1, P2) can be controlled by the control or regulation unit (11) as a function of the consumer-specific data (D).
    公开号:AT518192A1
    申请号:T24/2016
    申请日:2016-01-22
    公开日:2017-08-15
    发明作者:Ing Markus Otto Dipl；Ing Lohnecker Anton
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a hydraulic device for a molding machine, in particular for an injection molding machine, with a first pump for a hydraulic fluid, at least a second pump for the hydraulic fluid, at least one drive device for the first pump and second pump, a first main line, which from the first pump leads away, a second main line leading away from the second pump, a first consumer, which is connected via a first opening and a first secondary line to the first main line and which is connected via a second opening and a second secondary line to the second main line, and at least one second consumer, which is also connected via a third opening and a third bypass to one of the main lines. In addition, the invention relates to a molding machine with such a hydraulic device.
    Hydraulic devices are used in a variety of ways in the forming machine industry. For example, core pullers, mold platens, ejectors, etc. can be moved with consumers of such a hydraulic device.
    An example of such a hydraulic device is shown in DE 196 21 907 A1, in which a drive hydraulic machines is described. In this case, the pressure side of the first pump is connected to the inlet side and the pressure side of the second pump is connected to the outlet side of a consumer (in this case 1). The one variable displacement pump works promotional while the other works swallowing while fulfilling the function of a proportional valve, without generating its pressure losses. Although this document also mentions that several consumers (labeled 2, 3, 4 and 5) can be controlled, there is no indication that the type of activation of the former consumer could also be used for several consumers. Rather, the other consumers are controlled such that in each case the discharge side of the consumer is guided into the tank. The direction of movement of these other consumers is not controlled by the pump, but via a 4/3-way valve.
    From EP 1 181 458 B1, a similar hydraulic drive with several hydraulic consumers also comprising a differential cylinder emerges. Here again, the pressure side of the first pump is connected to the inlet side and the pressure side of the second pump to the outlet side of a consumer (in this case 10). Among other things, it is stated that there are already drives in which the two hydraulic machines are used to supply pressure to a single hydraulic consumer. Furthermore, the hydraulic pumps to provide additional consumers, it being emphasized that these consumers are controlled by way valves and their laxative side is connected to tank. Thus, in this document as well, the control of a consumer with two hydraulic pumps is used only for one consumer and not for several.
    The object of the present invention is therefore to provide a comparison with the prior art improved hydraulic device. In particular, the hydraulic device should be more efficient.
    This is achieved by a hydraulic device having the features of claim 1. Accordingly, the invention provides that the second consumer is connected on the one hand via the third opening and the third secondary line to the first main line and on the other hand connected via a fourth opening and a fourth secondary line to the second main line. Thus, the second consumer is also connected via separate secondary lines and openings once with the first main line and once with the second main line. Therefore, this second consumer can be used at least as efficiently as the first. Above all, the entire hydraulic system works more efficiently.
    A particular advantage of this invention is in energy efficiency, because targeted the pumps can be operated with the required amounts. In addition, no complicated throttling is necessary. Also, an energy recovery by the refluxing pump is possible because either both pumps are on an axis or connected to each other via an electrical DC link. Also, any valves in the secondary lines may be different (large). These valves can be designed as simple switching valves (no costly 4/3 way valves) and adapted to the size of the respective consumer, which in turn contributes to energy efficiency. These points also contribute significantly to the throttle losses are minimized, which can be dispensed with a hydraulic cooling. In addition, less oil is required in the tank and the hydraulic oil has a longer life because the hydraulic oil is less heated or stressed.
    Preferred embodiments of the present invention are recited in the subclaims.
    For example, it is preferably provided that the consumers are designed as piston-cylinder units or hydraulic motors. Different types of consumers can also be provided in one and the same hydraulic device. Especially when the consumer is designed as a piston-cylinder unit, it is preferably provided that the first and third openings each lead to a piston-side cavity in the cylinder of a piston-cylinder unit and the second and fourth openings each lead to a rod-side cavity in the cylinder of a piston-cylinder unit lead.
    In principle, it is sufficient if the allocation of the hydraulic fluid to the individual consumers takes place only via the pumps. Preferably, however, it is also provided that in each secondary line valves, preferably 2/2-way valves, are arranged. Thus, these valves can be used for the exact allocation of the hydraulic fluid to the respective consumers.
    With regard to the basic design of the drive device, two alternative variants are possible. On the one hand, it can be provided that the at least one drive device, which is preferably designed as an electric or hydraulic motor, drives both pumps. In this case, the two pumps can be connected to the one drive device via a common shaft. On the other hand, it can also be provided that at least two drive devices are provided, wherein each drive device drives one of the pumps.
    These drive devices can then be connected by signal technology.
    It is possible for the function of the individual pumps to take place using simple circuit diagrams. Also, an operator can adjust all settings for the pumps z. B. make appropriate control buttons. Preferably, however, a control or regulating unit is provided for controlling or regulating the pumps. In order to be able to use the control unit even more efficiently, it is preferably provided that the valves can also be actuated via the control or regulation unit. It is also of special control technical advantage if consumer-specific data, for example delivery volumes and / or area ratios of the consumers, are stored in the control or regulation unit. As a result, the pumps can be controlled by the control or regulation unit as a function of the consumer-specific data.
    It is in principle possible that at least two of the consumers are acted upon simultaneously by one or both pumps. For this purpose, however, corresponding branches z. B. in the form of valves necessary, which then take over the allocation of the hydraulic fluid again. To make this more efficient and to dispense with such complex additional components, it is preferably provided that the consumers are acted upon by the hydraulic fluid sequentially by the two pumps.
    Furthermore, it can be provided that the hydraulic device has more than two pumps. It can also be provided entire pump groups, which are operated individually or can be switched as a group.
    As pumps preferably constant or variable displacement pumps are used.
    If the consumers are designed in the form of piston-cylinder units, they can be designed as a synchronous cylinder (area ratio 1: 1) or as a differential cylinder (different area ratios).
    The valves can not only be designed as 2/2-way valves, but they can also be in the form of seat valves, whereby the pressure can be "locked". This is not possible with 4/3-way valves.
    The size of the pumps is designed for the driven consumers. Above all, the design of the pump is determined depending on the largest consumer. As a result, all smaller consumers - especially in the sequential circuit - can be operated with it.
    Finally, protection is also desired for a shaping machine with a hydraulic device according to the invention. Such a shaping machine can be designed, for example, in the form of an injection molding machine or an injection press. Of course, such a molding machine may also include a plurality of such hydraulic devices.
    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 shows schematically a hydraulic device with several consumers and a control unit,
    2 shows the hydraulic device according to FIG. 1 during extension of the first consumer, FIG.
    3 shows the hydraulic device according to FIG. 1 during retraction of the first consumer, FIG.
    4 schematically shows a hydraulic device with in turn several consumers in an open circuit,
    Fig. 5 shows the hydraulic device of FIG. 4 during extension of the second consumer and
    Fig. 6, the hydraulic device of FIG. 4 when retracting the second consumer.
    Fig. 1 shows a hydraulic device 1, which comprises a total of four consumers V1-V4. The first three consumers V1-V3 are each designed as piston-cylinder units 2, while the fourth consumer V4 is designed as a hydraulic motor 3. The piston-cylinder units 2 each have a cylinder 8 and a guided in the cylinder 8 piston 10 together with rod 9. The illustrated piston-cylinder units 2 are each designed as differential cylinders with different surface ratios (1: 2, 1: 4 and 0.5: 1).
    Furthermore, a first pump P1 and a second pump P2 are shown in FIG. These two pumps P1 and P2 are driven in this case by a drive device M1 via a common shaft 7. Only the first pump P1 is connected via a corresponding tank line 13 to the tank 12 for hydraulic fluid. The first pump P1 can suck in or out of this tank 12 via the tank line 13 hydraulic fluid. From the first pump P1, the first main line H1 leads away. Subsequently, the first main line H1 is connected to the sub-lines N1, N3, N5 and N7, which lead respectively to the consumers V1-V4. In these secondary lines N1, N3, N5 and N7 valves 6, in this case 2/2-way valves are arranged. The secondary lines N1, N3, N5 and N7 each open via an opening 01,03, 05 and 07 in one of the consumers V1-V4. Specifically, the openings 01,03 and 05 each lead into a piston-side cavity 4 in the cylinder 8 of the respective piston-cylinder units 2. In contrast, the secondary lines N2, N4 and N6 lead through the openings 02, 04 and 06 to the rod-side cavities 5 of Analog piston leads the secondary line N8 to the opening 08 of the hydraulic motor 3 (consumer V4). All of these sub-lines N2, N4, N6 and N8 are respectively connected to the second main line H2, which eventually leads to the second pump P2.
    In this schematic hydraulic device 1 according to FIG. 1, the control or regulating unit 11 is also shown. Consumer-specific data, such as delivery volumes or area ratios of the consumers V1-V4, are stored in this control or regulation unit 11. From this control or regulating unit 11, at least the two pumps P1 and P2 are controlled or regulated. By the dashed lines is also indicated that via this control or regulating unit 11 also, preferably all, valves 6 are controlled or regulated. For the function of the hydraulic device 1, reference may be made by way of example to FIG. 2. For extending the rod 9 of the first consumer V1, therefore, the first pump P1 from the tank 12 sucks hydraulic fluid and delivers this hydraulic fluid into the first main line H1. Since the valve 6 in the first sub-line N1 is correspondingly connected, the hydraulic fluid passes via the first opening 01 in the piston-side cavity 4 of the first consumer V1, whereby the piston 10 is moved relative to the cylinder 8 (in this case to the left). As a result of this movement, hydraulic fluid located in the rod-side cavity 5 is also forced via the second opening 02 in the cylinder 8 into the second secondary line N2. Subsequently, the hydraulic fluid passes through the second main line H2 in the second pump P2. In this second pump P2 energy recovery is possible. Since in this case the hydraulic device 1 is formed as a closed circuit, the hydraulic fluid passes after the second pump P2 via the circuit line 14 back into the first main line H1.
    How the consumer is movable in the other direction is illustrated in FIG. In this case, the second pump P2 conveys hydraulic fluid from the closed circuit via the second main line H2 to the second secondary line N2. From this, the hydraulic fluid passes through the second opening 02 in the rod-side cavity 5, whereby the piston 10 together with rod 9 relative to the cylinder 2 (in this case to the right) is moved. As a result, the hydraulic fluid is subsequently forced out of the piston-side cavity 4 via the first opening 01 into the first secondary line N1. From there, the hydraulic fluid returns via the first main line H1 back into the circuit line 14. Especially when the consumer is designed as a differential cylinder, the first pump P1 takes over the suction of excess hydraulic fluid into the tank 12. In the example shown have the maximum displacement the two pumps P1 and P2 a ratio of 1: 1. In order to be able to optimally utilize the pumps P1 and P2, this ratio can be adapted to the present system by consumers and thus vary for different systems.
    In Fig. 4 a slightly different embodiment of the hydraulic device 1 is shown schematically. In this case, the hydraulic device 1 is designed as an open circuit, wherein both the two pumps P1 and P2 and the hydraulic motor 3 are each connected to a separate tank 12. If the two pumps P1 and P2 are not driven by a drive device M1 via a common shaft 7, then a separate drive device M2 (indicated schematically) can also be provided. A difference can also be seen in this FIG. 4 in that the hydraulic motor 3 is connected to the second main line H2 only via the secondary line N8. A control unit 11 may, of course, be used in the same way as in FIG. 1, also in FIG. Otherwise, the hydraulic device 1 according to FIG. 4 is identical to the hydraulic device 1 according to FIG. 1. Reference may be made to FIGS. 5 and 6 for the mode of operation of this hydraulic device 1, the course of the movement of the load V2 being analogous to the movement of the load V1 according to FIGS. 2 and 3. Specifically, as shown in FIG. 5, hydraulic fluid (hydraulic oil) is supplied from the first pump P1 to the piston-side cavity 4 of the second consumer V2 via the first main pipe H1 and, due to the correspondingly-connected valve 6, via the third branch pipe N3 and the third orifice 03 , whereby the piston 10 together with rod 9 (in this case) moves to the left, preferably extended. As a result, hydraulic fluid is also forced out of the rod-side cavity 5 via the fourth opening 04 into the fourth secondary line N4, from where the hydraulic fluid is conveyed further into the tank 12 via the second main line H2 and the second pump P2. Since the piston-cylinder unit 2 of the second consumer V2 is designed as a differential cylinder with a ratio of 1: 4, 100% hydraulic fluid is conveyed by the first pump P1, for example, while at the same time 25% of hydraulic fluid is returned by the second pump P2 ( provided that the two pumps P1 and P2 have the same displacement).
    Conversely, for the movement of the piston 10 of the second consumer V2 to the right only 25% of the delivery volume of the second pump P2 is required to promote 100% of hydraulic fluid back through the first pump P1, as is the case in FIG. Thus, with this hydraulic device 1 consumers with different area ratios in a simple manner, preferably sequentially operated. Also, consumers can be operated both in the closed and in the open circuit.
    In general, it should also be mentioned that in a particularly preferred embodiment, a third consumer V3 is provided which is connected via a fifth opening 05 and a fifth bypass N5 to the first main line H1 and via a sixth opening 06 and a sixth bypass N6 with the second Main line H2 is connected. In addition, a fourth consumer V4 can also be provided, which is connected via a seventh opening 07 and a seventh secondary line N7 to the first main line H1 and is connected to the second main line H2 via an eighth opening 08 and an eighth secondary line N8. Preferably, these consumers V3 and V4 are also driven sequentially by the pumps P1 and P2.
    In other words, the present invention can also be expressed as follows:
    The present invention can be used especially for multi-axis systems. A central pump station (server motor + control pump) supplies several hydraulic axes (consumers V1-V4) via long lines and corresponding switching elements (valves 6). Two control pumps (pumps P1 and P2) driven by an electric motor (asynchronous or synchronous motor) are used to drive a hydraulic actuator. The positioning of the actuator (consumer) via a corresponding regulation. By using the second pump P2, there is the possibility of energy recovery. In order to operate several hydraulic axes with a drive system, switching elements are necessary to direct the supply of the actuators accordingly. It does not have to be compact axes. Especially when used in an injection molding machine, there is a central pump station from which consumers can be supplied with long lines. The
    Control technology can be done via a central control or regulating unit 11, which is mainly the switching between different consumers V1-V4.
    In particular, the system may be designed such that either one motor (drive device M1) with two control pumps (pumps P1 and P2) or two motors (drive devices M1 and M2) with constant pumps (pumps P1 and P2) at least two consumers from the group V1 Drive -V4. The consumers V1-V4 can have different volume requirements and be operated by volume and pressure control. Exemplary proportions of the cylinder chambers are shown in the figures. The direction reversal is not realized by way valves, but is done purely by the control of the pumps P1 and P2. The different consumers from the group V1-V4 are preferably driven only sequentially. This is preferably done by simple on-off valves, whereby the individual consumers V1-V4 are connected to the supply system or separated from it. Alternatively, poppet valves can be used to lock the position. Preferably, the control or regulating unit at any time via the information which consumer is operated from the group V1-V4. Ramps (power or off-ramp) control the movement in a controlled manner.
    In the first variant according to FIGS. 1 to 3, the hydraulic device 1 operates in a semi-open circuit, wherein only one pump (first pump P1) is connected directly to the tank 12. This pump P1 compensates for the different amounts required between the cylinder chambers 4 and 5. Thus, the first pump P1 draws volume from the system when the piston 10 of the consumer is retracted and delivers volume into the system when the piston 10 is extended. In this system, the hydraulic motor 3 can be operated both in the open and in the closed circuit.
    In variant 2 (FIGS. 4 to 6), the hydraulic device 1 includes two pumps P1 and P2, which are each connected to the tank 12. Preferably, pumps P1 and P2 with different displacement volumes are used in order to allow optimum adaptation to the different quantity requirements of the respective cylinder chambers 4 and 5. In this system, the hydraulic motor 3 is operated in the open circuit.
    Thus, in contrast to the prior art, it is not only possible with the present invention to drive one consumer but several consumers.
    This is controlled or regulated by switching one pump to the inlet side and the other pump to the outlet side of the consumer. For the driving direction of the other consumers are not responsible 4/3-way valves, but on the pump results in the desired direction of movement, depending on which pump promotes and which sucks. The separation of the consumers from the pressure does not take place via 4/3-way valves, but via 2/2-way valves.
    权利要求:
    Claims (13)
    [1]
    claims
    Hydraulic device (1) for a molding machine, in particular for an injection molding machine, comprising - a first pump (P1) for a hydraulic fluid, - at least one second pump (P2) for the hydraulic fluid, - at least one drive device (M1) for the first pump (P1) and second pump (P2), - a first main line (H1), which leads away from the first pump (P1), - a second main line (H2), which leads away from the second pump (P2), * - a first Consumer (V1), which is connected via a first opening (01) and a first secondary line (N1) to the first main line (H1) and via a second opening (02) and a second secondary line (N2) with the second main line ( H2), and - at least one second consumer (V2), which is also connected via a third opening (03) and a third secondary line (N3) to one of the main lines (H1, H2), characterized in that the second consumer (V2) on the one hand over d The third opening (03) and the third secondary line (N3) are connected to the first main line (H1) and, on the other hand, are connected to the second main line (H2) via a fourth opening (04) and a fourth secondary line (N4).
    [2]
    2. Hydraulic device according to claim 1, characterized in that the consumers (V1, V2) as piston-cylinder units (2) or hydraulic motors (3) are formed.
    [3]
    3. A hydraulic device according to claim 2, characterized in that the first and third openings (01.03) each lead to a piston-side cavity (4) in the cylinder (8) of the respective piston-cylinder unit (2) and the second and fourth Opening (02, 04) each lead to a rod-side cavity (5) in the cylinder (8) of the respective piston-cylinder unit (2).
    [4]
    4. Hydraulic device according to one of claims 1 to 3, characterized in that in each secondary line (N1-N4) valves (6), preferably 2/2-way valves, are arranged.
    [5]
    5. Hydraulic device according to one of claims 1 to 4, characterized in that the at least one drive device (M1), which is preferably designed as an electric or hydraulic motor, both pumps (P1, P2) drives.
    [6]
    6. A hydraulic device according to claim 5, characterized in that the two pumps (P1, P2) with the one drive device (M1) via a common shaft (7) are connected.
    [7]
    7. Hydraulic device according to one of claims 1 to 4, characterized in that at least two drive devices (M1, M2) are provided, each drive device (M1, M2) each one of the pumps (P1, P2) drives.
    [8]
    8. Hydraulic device according to one of claims 1 to 7, characterized in that a control or regulating unit (11) for controlling or regulating the pump (P1, P2) is provided.
    [9]
    9. A hydraulic device according to claim 8, characterized in that on the control or regulating unit (11) and the valves (6) are controllable.
    [10]
    10. Hydraulic device according to claim 8 or 9, characterized in that in the control or regulation unit (11) consumer-specific data (D), for example, delivery volumes and / or area ratios of the consumer (V1, V2), are deposited.
    [11]
    11. A hydraulic device according to claim 10, characterized in that the pumps (P1, P2) in dependence of the consumer-specific data (D) by the control or regulating unit (11) are controllable.
    [12]
    12. Hydraulic device according to one of claims 1 to 11, characterized in that the consumers (V1, V2) via the two pumps (P1, P2) are sequentially acted upon by the hydraulic fluid.
    [13]
    13. Forming machine, in particular injection molding machine, with a hydraulic device (1) according to one of claims 1 to 12.
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    同族专利:
    公开号 | 公开日
    DE102017000523B4|2018-05-09|
    AT518192B1|2017-11-15|
    DE102017000523A1|2017-07-27|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19621907A1|1996-05-31|1997-12-04|Boy Gmbh Dr|Hydraulic drive system for controlling several power units, especially of injection moulding machine|
    US20010035011A1|1996-09-25|2001-11-01|Komatsu Ltd.|Pressurized fluid recovery/reutilization system|
    EP1236558A1|2001-03-03|2002-09-04|Mannesmann Rexroth AG|Method for fluid supply regulation of an hydraulic actuator|
    EP1793127A1|2005-02-03|2007-06-06|Daikin Industries, Ltd.|Fluid pressure unit and control method for the same|
    US20080210485A1|2006-01-16|2008-09-04|Volvo Construction Equipment Ab|Control system for frame-steering of a vehicle and method for controlling two steering cylinders in a frame-steered vehicle|
    DE102009033645A1|2009-07-17|2011-01-20|Robert Bosch Gmbh|Hydraulic control arrangement|
    US4369625A|1979-06-27|1983-01-25|Hitachi Construction Machinery Co., Ltd.|Drive system for construction machinery and method of controlling hydraulic circuit means thereof|
    JPS6319724B2|1981-10-02|1988-04-25|Hitachi Construction Machinery|
    AU1377997A|1996-01-10|1997-08-01|Aeroquip-Vickers International Gmbh|Low-loss drive system for a plurality of hydraulic actuators|
    DE19924473A1|1999-05-28|2000-11-30|Mannesmann Rexroth Ag|Hydraulic drive with several hydraulic consumers including a differential cylinder, in particular on a plastic injection molding machine|
    US7712309B2|2005-02-17|2010-05-11|Volvo Construction Equipment Ab|Arrangement and a method for controlling a work vehicle|
    US20080089964A1|2006-10-13|2008-04-17|Husky Injection Molding Systems Ltd.|Drive of molding system|
    CN101758587A|2008-11-14|2010-06-30|张海忠|Forming machine with hydraulic mechanism|
    BRPI1012016A2|2009-04-08|2016-05-10|Parker Hannifin Corp|multiple pump hydraulic circuit|
    KR101601979B1|2009-12-24|2016-03-10|두산인프라코어 주식회사|Pump Control Actuation System of Construction Machinery|
    US8943819B2|2011-10-21|2015-02-03|Caterpillar Inc.|Hydraulic system|
    US8978374B2|2011-10-21|2015-03-17|Caterpillar Inc.|Meterless hydraulic system having flow sharing and combining functionality|
    US9279236B2|2012-06-04|2016-03-08|Caterpillar Inc.|Electro-hydraulic system for recovering and reusing potential energy|
    JP6134614B2|2013-09-02|2017-05-24|日立建機株式会社|Drive device for work machine|
    JP5973979B2|2013-11-21|2016-08-23|日立建機株式会社|Drive device for work machine|
    CN104452868B|2014-09-26|2017-02-15|太原理工大学|Double-hydraulic-cylinder mixed drive control system|
    JP5905617B1|2015-03-27|2016-04-20|東芝機械株式会社|Injection device and molding device|
    JP6539556B2|2015-09-18|2019-07-03|株式会社神戸製鋼所|Hydraulic drive of work machine|DE102017129117A1|2017-12-07|2019-06-13|Moog Gmbh|Device and method for cylinder switching with a mechanically lockable power cylinder|
    法律状态:
    2021-09-15| MM01| Lapse because of not paying annual fees|Effective date: 20210122 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA24/2016A|AT518192B1|2016-01-22|2016-01-22|Hydraulic device for a molding machine|ATA24/2016A| AT518192B1|2016-01-22|2016-01-22|Hydraulic device for a molding machine|
    US15/407,698| US20170210047A1|2016-01-22|2017-01-17|Hydraulic device for forming a machine|
    DE102017000523.0A| DE102017000523B4|2016-01-22|2017-01-20|Hydraulic device for a molding machine|
    CN201710223117.XA| CN107013519B|2016-01-22|2017-01-22|Hydraulic device for molding machine and the molding machine with hydraulic device|
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