Hydraulic driving system and press machine

Abstract

The utility model discloses a hydraulic drive system and a press machine, which comprises a container, a pump body and at least one execution component, the container is used for storing hydraulic fluid, and the pump body is connected with the container and used for driving the hydraulic fluid to flow; the execution assembly is connected with the pump body, the execution assembly comprises an execution unit and a hydraulic control one-way valve, and the execution unit is used for executing a driving action when the pump body runs; the hydraulic control one-way valve is connected between the execution unit and the pump body and used for preventing the hydraulic fluid in the execution unit from flowing back, and the hydraulic control one-way valve is provided with a hydraulic control connector. The hydraulic control connector is used for being connected with the pump body so as to drive the hydraulic control one-way valve to be opened and enable the hydraulic liquid in the execution unit to be discharged back to the container when the pump body operates. The working cavity of the execution unit of the hydraulic driving system is good in pressure maintaining capacity, and reliability and stability of the hydraulic driving system during operation are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic drive technical field, specifically, relate to a kind of hydraulic drive system and a press. BACKGROUND

[0002] In recent years, new energy automobile industry develops rapidly, in order to ensure production capacity and processing quality, the existing vehicle body outer covering piece etc. of vehicle is formed by using the mode of stamping, but the existing stamping equipment has the problem of poor pressure maintaining ability of working cavity, which reduces the reliability and stability of the stamping equipment during operation. SUMMARY

[0003] The utility model aims at at least one of the technical problems in the related art.

[0004] Therefore, the utility model embodiment proposes a kind of hydraulic drive system, the pressure maintaining ability of working cavity of the execution unit of the hydraulic drive system is good, improves the reliability and stability of the hydraulic drive system during operation.

[0005] The utility model embodiment further proposes a kind of press comprising the above-mentioned hydraulic drive system.

[0006] The hydraulic drive system of the utility model embodiment comprises:

[0007] container and pump body, the container is used to store hydraulic fluid, the pump body is connected with the container and is used to drive the hydraulic fluid to flow;

[0008] At least one execution component, the execution component is connected with the pump body, and the execution component comprises:

[0009] execution unit, the execution unit is used to execute driving action when the pump body operates;

[0010] hydraulic control check valve, the hydraulic control check valve is connected between the execution unit and the pump body and is used to prevent the hydraulic fluid in the execution unit from flowing back, and the hydraulic control check valve is provided with hydraulic control interface, the hydraulic control interface is used to be connected with the pump body to drive the hydraulic control check valve to open when the pump body operates and make the hydraulic fluid in the execution unit back to the container.

[0011] In some embodiments, the hydraulic control check valve is provided with first interface and second interface, the first interface is connected with the pump body or the container, the second interface is connected with the execution unit, and the first interface and the second interface are used to communicate when the first interface or the hydraulic control interface is connected with the hydraulic fluid.

[0012] In some embodiments, the execution assembly comprises a reversing valve, the reversing valve is provided with a first port, a second port, a third port and a fourth port, the first port is connected with the pump body, the second port is connected with the container, the third port is connected with the first interface, and the fourth port is connected with the hydraulic control interface.

[0013] The reversing valve has a first state and a second state, in the first state, the first port and the fourth port are communicated, and the second port and the third port are communicated, in the second state, the first port and the third port are communicated, and the second port and the fourth port are communicated.

[0014] In some embodiments, the execution assembly comprises a first check valve, the first check valve is arranged between the second port and the container, and the first check valve is used to prevent the hydraulic liquid in the container from flowing back to the second port.

[0015] In some embodiments, the execution assembly comprises a pressure reducing valve, the pressure reducing valve is arranged between the pump body and the first port.

[0016] In some embodiments, the execution assembly comprises a first check throttle valve and a second check throttle valve, the first check throttle valve and the second check throttle valve are both connected between the execution unit and the hydraulic control check valve.

[0017] When the execution unit enters the hydraulic liquid, the first check throttle valve is communicated between the hydraulic control check valve and the execution unit.

[0018] When the hydraulic liquid in the execution unit is discharged, the second check throttle valve is communicated between the hydraulic control check valve and the execution unit.

[0019] In some embodiments, the execution unit, the first check throttle valve and the second check throttle valve of the execution assembly are all provided in plurality, and one first check throttle valve and one second check throttle valve are arranged between each execution unit and the hydraulic control check valve.

[0020] In some embodiments, the execution assembly comprises:

[0021] a first pressure sensor, the first pressure sensor is arranged between the hydraulic control check valve and the execution unit;

[0022] and / or a first on-off valve, the first on-off valve is arranged between the hydraulic control check valve and the execution unit.

[0023] In some embodiments, further comprising:

[0024] A second pressure sensor is arranged between the actuating assembly and the pump body.

[0025] A second on-off valve is arranged between the actuating assembly and the pump body.

[0026] A second check valve is arranged between the actuating assembly and the pump body.

[0027] In some embodiments, an overflow valve is further included, the overflow valve is arranged in parallel with the pump body, the overflow valve, the pump body and the container form a circulation, and the overflow valve is used to open before the pump body starts and close after the pump body starts.

[0028] In some embodiments, a filter is further included, the filter is arranged at at least one of an inlet of the pump body and an outlet of the pump body.

[0029] In some embodiments, the actuating assembly has two, one of the two actuating assemblies has a clamping unit as the actuating unit, and the other has a jacking unit as the actuating unit.

[0030] The hydraulic drive system of the utility model embodiment comprises the actuating assembly as described in any one of the above embodiments.

[0031] Beneficial effects: the hydraulic drive system and the presser machine of the utility model embodiment, the pressure maintaining capability of the working cavity of the actuating unit of the hydraulic drive system is good, and the reliability and stability during the operation of the hydraulic drive system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic view of the hydraulic drive system of the utility model embodiment.

[0033] Figure 2 is Figure 1 a schematic view of the actuating assembly.

[0034] Figure 3 is a schematic view of the hydraulic drive system of another utility model embodiment.

[0035] REFERENCE NUMERALS:

[0036] 1 - container;

[0037] 2 - pump body;

[0038] 3 - execution assembly; 31 - execution unit; 311 - clamping unit; 312 - jacking unit; 32 - hydraulic control one-way valve; 321 - hydraulic control interface; 322 - first interface; 323 - second interface; 33 - reversing valve; 331 - first port; 332 - second port; 333 - third port; 334 - fourth port; 34 - first one-way valve; 35 - pressure reducing valve; 36 - first one-way throttle valve; 37 - second one-way throttle valve; 38 - first pressure sensor; 39 - first on-off valve;

[0039] 4 - second pressure sensor;

[0040] 5 - second on-off valve;

[0041] 6 - second one-way valve;

[0042] 7 - overflow valve;

[0043] 8 - filter;

[0044] 9 - pressure gauge. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, examples of which are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0046] As shown in Figure 1 , the hydraulic drive system of the embodiments of the present application comprises a container 1, a pump body 2 and at least one execution assembly 3.

[0047] The container 1 is used to store hydraulic fluid, and the pump body 2 is connected to the container 1 and used to drive the hydraulic fluid to flow. For example, as shown in Figure 1 , the container 1 can have an oil tank and the like, and the hydraulic fluid can be hydraulic oil. The hydraulic fluid can be stored in the container 1 in advance, thereby meeting the use needs of supplying hydraulic fluid in use.

[0048] The pump body 2 can be a hydraulic pump, and the pump body 2 can be connected downstream of the container 1. When the pump body 2 is running, the hydraulic fluid in the container 1 can be transported to the execution assembly 3 through the pump body 2, thereby providing power support for the transportation of the hydraulic fluid.

[0049] As shown in Figure 1 , the execution assembly 3 can be provided with only one, the execution assembly 3 is connected to the pump body 2, and the execution assembly 3 comprises an execution unit 31 and a hydraulic control one-way valve 32.

[0050] The actuator 31 is used to perform driving actions when the pump body 2 is running. For example, the actuator 31 can be an actuator cylinder, etc. When the pump body 2 is running, hydraulic fluid can be delivered to the working chamber of the actuator 31, thereby enabling operations such as extending or retracting the actuator cylinder, thus meeting the driving needs.

[0051] The hydraulically controlled check valve 32 is connected between the actuator 31 and the pump body 2 and is used to prevent the backflow of hydraulic fluid in the actuator 31. Specifically, the hydraulically controlled check valve 32 allows hydraulic fluid to flow from the pump body 2 to the actuator 31, that is, the hydraulic fluid pumped by the pump body 2 is unobstructed at the hydraulically controlled check valve 32 and can flow directly through it, thereby meeting the usage requirement of supplying hydraulic fluid to the actuator 31 to perform driving actions.

[0052] Meanwhile, since the hydraulic control check valve 32 only allows flow in one direction, under normal conditions, the hydraulic fluid at the actuator 31 will not flow back to the pump body 2 through the hydraulic control check valve 32, thus ensuring the good pressure holding performance of the actuator 31.

[0053] The hydraulic control check valve 32 is provided with a hydraulic control interface 321, which is used to connect to the pump body 2 to drive the hydraulic control check valve 32 to open when the pump body 2 is running, and to allow the hydraulic fluid in the actuator 31 to be discharged back to the container 1.

[0054] For example, such as Figure 1 As shown, the hydraulic control interface 321 can be connected to the pump body 2 via a pipeline. It should be noted that this connection is selective. In actual use, the hydraulic control interface 321 can be connected to the pump body 2 by operation or disconnection.

[0055] When it is necessary to discharge the hydraulic fluid in the actuator 31, the hydraulic control interface 321 can be connected to the pump body 2. At this time, a portion of the hydraulic fluid delivered by the pump body 2 can be delivered to the hydraulic control check valve 32 via the hydraulic control interface 321. Under the action of this portion of hydraulic fluid, the hydraulic control check valve 32 can be opened, that is, the hydraulic control check valve 32 also allows reverse flow, which plays the role of releasing the one-way restriction of the hydraulic control check valve 32, so that the hydraulic fluid in the actuator 31 can flow back to the container 1 via the hydraulic control check valve 32.

[0056] The hydraulic drive system of this utility model embodiment is equipped with a hydraulically controlled check valve 32, which avoids the easy backflow of hydraulic fluid in the actuator 31, improves the pressure holding effect of the actuator 31, and thus ensures the reliability and stability of the hydraulic drive system during operation.

[0057] Secondly, the hydraulic control check valve 32 can be connected with the pump body 2 to release the one-way restriction, so that the hydraulic fluid in the execution unit 31 can also return through the hydraulic control check valve 32, thereby facilitating the release of the driving action of the execution unit 31, simplifying the overall structure, and reducing the overall layout cost.

[0058] In some embodiments, the hydraulic control check valve 32 is provided with a first interface 322 and a second interface 323, the first interface 322 is connected with the pump body 2 or the container 1, and the second interface 323 is connected with the execution unit 31, and the first interface 322 and the second interface 323 are used to communicate when the hydraulic fluid is introduced into the first interface 322 or the hydraulic control interface 321.

[0059] For example, as shown in Figure 2 The first interface 322 and the second interface 323 can be used as liquid inlet or liquid outlet, and under normal circumstances, the first interface 322 and the second interface 323 can be cut off due to the one-way flow restriction of the hydraulic control check valve 32.

[0060] When it is necessary to introduce hydraulic fluid into the execution unit 31, the hydraulic fluid pumped by the pump body 2 can be directly delivered to the hydraulic control check valve 32 through the first interface 322, and under the action of the hydraulic fluid, the first interface 322 and the second interface 323 are communicated, so that the hydraulic fluid can be directly delivered to the execution unit 31.

[0061] When it is necessary to discharge the hydraulic fluid in the execution unit 31, the hydraulic control interface 321 and the pump body 2 can be connected, at this time, the hydraulic fluid delivered by the pump body 2 can be delivered to the hydraulic control check valve 32 and release the cut-off state between the first interface 322 and the second interface 323, so that the hydraulic fluid in the execution unit 31 can return through the hydraulic control check valve 32.

[0062] In some embodiments, as shown in Figure 2 The execution assembly 3 includes a reversing valve 33, which can be an electromagnetic valve, the reversing valve 33 is provided with a first port 331, a second port 332, a third port 333 and a fourth port 334, the first port 331 and the second port 332 can be arranged on the left side of the reversing valve 33, and the third port 333 and the fourth port 334 can be arranged on the right side of the reversing valve 33, wherein the first port 331 can be connected with the pump body 2 through a pipeline, the second port 332 can be connected with the container 1 through a pipeline, the third port 333 can be connected with the first interface 322 through a pipeline, and the fourth port 334 can be connected with the hydraulic control interface 321 through a pipeline.

[0063] The reversing valve 33 has a first state and a second state. For example, when the reversing valve 33 is an electromagnetic valve, a spool inside the reversing valve 33 can reciprocate under the action of the current input, for example, when the current is input to one side of the reversing valve 33, the spool can move to that side and can switch the reversing valve 33 to the first state, and vice versa, the spool can move to the other side of the reversing valve 33 and can switch the reversing valve 33 to the second state.

[0064] As shown in FIG. 3, when the reversing valve 33 is switched to the first state, the first port 331 and the fourth port 334 are in communication, and the second port 332 and the third port 333 are in communication. At this time, the hydraulic fluid delivered by the pump body 2 can first flow to the hydraulic control interface 321 of the hydraulic control check valve 32 via the first port 331 and the fourth port 334, thereby removing the one-way restriction of the flow direction of the hydraulic control check valve 32, and then the hydraulic fluid in the execution unit 31 can flow back to the container 1 along the second interface 323, the first interface 322 of the hydraulic control check valve 32, the third port 333, and the second port 332 of the reversing valve 33. Figure 2 As shown in FIG. 4, when the reversing valve 33 is switched to the second state, the first port 331 and the third port 333 are in communication, and the second port 332 and the fourth port 334 are in communication. At this time, the hydraulic fluid delivered by the pump body 2 can flow to the first interface 322 of the hydraulic control check valve 32 via the first port 331 and the third port 333, and then can flow out from the second interface 323 of the hydraulic control check valve 32 and finally flow into the execution unit 31.

[0065] Figure 2 The provision of the reversing valve 33 facilitates the switching of the supply and discharge of the hydraulic fluid in the execution unit 31, which can be achieved by switching the reversing valve 33 to different states, thereby simplifying the overall structural arrangement of the execution assembly 3, reducing costs, and improving the convenience of different operations.

[0066] In some embodiments, the execution assembly 3 includes a first check valve 34, which is arranged between the second port 332 and the container 1, and is used to prevent the hydraulic fluid in the container 1 from flowing back to the second port 332.

[0067] For example, as shown in FIG. 5, the first check valve 34 can be arranged on the pipeline between the second port 332 of the reversing valve 33 and the container 1, the first check valve 34 allows the hydraulic fluid to flow from the second port 332 to the container 1, and at the same time prevents the hydraulic fluid in the container 1 from flowing back to the second port 332, further ensuring the stability of use. Secondly, it can make the system always have corresponding oil, which can improve the efficiency of building pressure.

[0068] For example, as shown in FIG. 5, the first check valve 34 can be arranged on the pipeline between the second port 332 of the reversing valve 33 and the container 1, the first check valve 34 allows the hydraulic fluid to flow from the second port 332 to the container 1, and at the same time prevents the hydraulic fluid in the container 1 from flowing back to the second port 332, further ensuring the stability of use. Secondly, it can make the system always have corresponding oil, which can improve the efficiency of building pressure. Figure 2

[0069] ​​In some embodiments, the execution assembly 3 comprises a pressure reducing valve 35, which is arranged between the pump body 2 and the first port 331. For example, as shown in Figure 2 The pressure reducing valve 35 can be arranged on the pipeline between the first port 331 of the reversing valve 33 and the pump body 2, and can function as a pressure reducing valve to reduce the influence of the hydraulic fluid delivered by the pump body 2 on the reversing valve 33, the hydraulic control check valve 32, etc.

[0070] In some embodiments, as shown in Figure 2 The execution assembly 3 comprises a first one-way throttle valve 36 and a second one-way throttle valve 37, which are both connected between the execution unit 31 and the hydraulic control check valve 32, and one of the first one-way throttle valve 36 and the second one-way throttle valve 37 can be used as a throttle valve when the execution unit 31 is filled with liquid, and the other one can be used as a throttle valve when the execution unit 31 is drained, i.e. the first one-way throttle valve 36 and the second one-way throttle valve 37 can be selectively accessed between the hydraulic control check valve 32 and the execution unit 31 according to actual needs.

[0071] Specifically, when the execution unit 31 is filled with hydraulic fluid, the first one-way throttle valve 36 is connected between the hydraulic control check valve 32 and the execution unit 31, thereby functioning as a liquid filling throttle and pressure regulating valve.

[0072] When the hydraulic fluid in the execution unit 31 is drained, the second one-way throttle valve 37 is connected between the hydraulic control check valve 32 and the execution unit 31, thereby functioning as a liquid draining throttle and pressure regulating valve.

[0073] In some embodiments, the execution assembly 3 comprises a plurality of execution units 31, first one-way throttle valves 36 and second one-way throttle valves 37, and one first one-way throttle valve 36 and one second one-way throttle valve 37 are arranged between each execution unit 31 and the hydraulic control check valve 32.

[0074] For example, as shown in Figure 2 The execution unit 31, the first one-way throttle valve 36 and the second one-way throttle valve 37 can each be provided with four, and each execution unit 31 can be equipped with one first one-way throttle valve 36 and one second one-way throttle valve 37. By corresponding first one-way throttle valves 36 and second one-way throttle valves 37, the execution unit 31 can function as a liquid filling and draining throttle and pressure regulating valve, thereby facilitating the synchronization and consistency of the operation of the four execution units 31.

[0075] In some embodiments, as shown in Figure 2As shown, the execution assembly 3 comprises a first pressure sensor 38, which is arranged between the hydraulic control check valve 32 and the execution unit 31. When the hydraulic drive system is running, the first pressure sensor 38 can monitor the pressure of the hydraulic fluid in the execution unit 31 in real time. If the monitored pressure does not meet the requirements, the pump body 2 can be started to pressurize until the pressure of the hydraulic fluid meets the requirements, and then the pump body 2 can be closed.

[0076] In some embodiments, as shown in the figure, Figure 2 As shown, the execution assembly 3 further comprises a first on-off valve 39, which is arranged between the hydraulic control check valve 32 and the execution unit 31. The first on-off valve 39 can be a ball valve, which can block part of the hydraulic drive system, so as to facilitate segmented discharge and processing of the system when troubleshooting.

[0077] In some embodiments, as shown in the figure, Figure 2 As shown, the hydraulic drive system further comprises a second pressure sensor 4, which is arranged between the execution assembly 3 and the pump body 2. For example, as shown in the figure, Figure 1 The pump body 2 and the execution assembly 3 can be connected through a main pipeline, and the second pressure sensor 4 can be arranged on the main pipeline, so as to monitor the pressure of the output hydraulic fluid of the pump body 2, thereby facilitating the understanding of the running status of the pump body 2.

[0078] Secondly, the hydraulic value monitored by the second pressure sensor 4 can also be used as a reference value of the first pressure sensor 38. For example, when the value monitored by the first pressure sensor 38 is lower than the value monitored by the second pressure sensor 4, the pump body 2 can be started to pressurize.

[0079] In some embodiments, as shown in the figure, Figure 2 As shown, the hydraulic drive system further comprises a second on-off valve 5, which is arranged between the execution assembly 3 and the pump body 2. The second on-off valve 5 can also be a ball valve, which can be installed on the main pipeline, so as to block part of the hydraulic drive system, thereby facilitating segmented discharge and processing of the system when troubleshooting.

[0080] In some embodiments, as shown in the figure, Figure 2 As shown, the hydraulic drive system further comprises a second check valve 6, which is arranged between the execution assembly 3 and the pump body 2. The second check valve 6 can also be arranged on the main pipeline, so as to inhibit the backflow of the hydraulic fluid in the execution assembly 3 to the pump body 2, thereby further improving the pressure maintaining effect.

[0081] In some embodiments, the hydraulic driving system further comprises an overflow valve 7, the overflow valve 7 is arranged in parallel with the pump body 2, the overflow valve 7, the pump body 2 and the container 1 form a circulation, and the overflow valve 7 is used to open before the pump body 2 starts and close after the pump body 2 starts.

[0082] For example, as shown in Figure 3 The overflow valve 7 can be an electromagnetic overflow valve 7, the overflow valve 7 can be arranged in parallel with the pump body 2 through a corresponding pipeline, and the overflow valve 7, the pump body 2 and the container 1 can form a circulation. Before the pump body 2 starts, the overflow valve 7 can be opened, so that part of the hydraulic fluid can flow back to the container 1 through the overflow valve 7 during the starting of the pump body 2, avoiding the problem that the starting hydraulic impact force of the pump body 2 is large, the heat is large, and the components are easily damaged.

[0083] After the pump body 2 is completely started, the overflow valve 7 can be closed, so that the pressure of the hydraulic fluid delivered by the pump body 2 can meet the needs of use.

[0084] In some embodiments, the hydraulic driving system further comprises a filter 8, the filter 8 is arranged at at least one of the inlet of the pump body 2 and the outlet of the pump body 2.

[0085] For example, as shown in Figure 3 The filter 8 can be provided with two, the two filters 8 can be suction filters 8 and high-pressure filters 8 respectively, wherein the suction filter can be arranged at the inlet of the pump body 2, and the high-pressure filter can be arranged at the outlet of the pump body 2, both of which can play a filtering role, thereby ensuring the cleanliness of the hydraulic fluid.

[0086] In some embodiments, the execution assembly 3 has two, one of the execution units 31 of the two execution assemblies 3 is a clamping unit 311, and the other is a jacking unit 312.

[0087] For example, as shown in Figure 3 The hydraulic driving system can be provided with two relatively independent execution assemblies 3, and the execution units 31 of the two execution assemblies 3 can be different. The execution unit 31 of one of the execution assemblies 3 can be a clamping unit 311, which can be a clamping cylinder or the like, and the execution unit 31 of the other execution assembly 3 can be a jacking unit 312, which can be a jacking cylinder or the like. In use, the clamping unit 311 can realize clamping and fixing of a workbench or the like, and the jacking unit 312 can realize jacking of the workbench or the like. Thus, one set of hydraulic system can meet the needs of different execution actions.

[0088] In some embodiments, as shown in Figure 3As shown, a pressure gauge 9 or the like can also be arranged on the main pipeline, so that the pressure of the hydraulic fluid pumped by the pump body 2 can be conveniently observed by the pressure gauge 9.

[0089] A press of an embodiment of the present application is described below.

[0090] The press of the embodiment of the present application comprises a hydraulic drive system, which can be the hydraulic drive system described in any of the above embodiments. The press can specifically be a stamping device for stamping a vehicle body outer covering, and can also be other types of press devices.

[0091] A specific example of the press of the embodiment of the present application is described below.

[0092] The worktable of the press of the embodiment of the present application has the functions of entering and exiting the station, and the press also has the functions of jacking up and clamping.

[0093] The press comprises a hydraulic drive system, which comprises a container 1 (oil tank), a pump body 2, and an execution assembly 3, wherein the execution assembly 3 comprises an execution unit 31, a hydraulic control check valve 32, a reversing valve 33 (solenoid valve), a first check valve 34, a first check throttle valve 36, a second check throttle valve 37, a first pressure sensor 38, a first on-off valve 39, and the like. The above execution assembly 3 is provided with two, and the execution units 31 of the two execution assemblies 3 are respectively a clamping cylinder and a jacking cylinder, wherein the execution assembly 3 comprising the clamping cylinder can also comprise a pressure reducing valve 35. For convenience of distinction, the execution assembly 3 comprising the clamping cylinder is referred to as a clamping assembly, and the execution assembly 3 comprising the jacking cylinder is referred to as a jacking assembly.

[0094] In addition, the hydraulic drive system further comprises a second pressure sensor 4, a second on-off valve 5, a second check valve 6, a relief valve 7, a filter 8, and the like.

[0095] When the worktable enters, the clamping cylinder needs to be in a relaxed state, and the jacking cylinder is in a jacking state; after the worktable enters, the jacking cylinder falls into place, and then the clamping cylinder clamps, and the worktable reaches a working state.

[0096] When the worktable is to be exited, the clamping cylinder is first released into place, then the jacking cylinder is jacked into place, and then the worktable is exited.

[0097] The two states of the worktable jacking up and clamping require the system to continuously ensure the jacking force and the clamping force, so as to ensure that the worktable is smoothly entered and exited and normally in a working clamping state.

[0098] When the hydraulic drive system is working, the pump body 2 is started to deliver hydraulic oil to the jacking cylinder or the clamping cylinder. When the pressure reaches the set value, the second pressure sensor 4 sends a signal to the control system to stop the pump body 2. When the pressure detected by the first pressure sensor 38 of the clamping assembly or the first pressure sensor 38 of the jacking assembly is lower than the set value, the pump body 2 is started again until the pressure reaches the set value of the second pressure sensor 4. If the pressure does not reach the set value for a period of time, the equipment will alarm and stop.

[0099] Before each start of the pump body 2, the overflow valve 7 (electromagnetic overflow valve) is powered first to protect the system. The hydraulic control check valve 32 of the two execution assemblies 3 has excellent sealing performance, which can ensure that the pressure remains for a long time. The actions of each execution unit 31 can be kept synchronized through the corresponding first one-way throttle valve 36 and second one-way throttle valve 37. Any failure that causes abnormal pressure can generate an alarm, which facilitates quick locking of the problem cause. The settings of the first on-off valve 39 and the second on-off valve 5 facilitate segmented troubleshooting and processing of the system when troubleshooting, which improves troubleshooting efficiency.

[0100] As shown in Figure 3 , the specific action process is as follows:

[0101] 1) Relaxation:

[0102] The overflow valve 7 is powered, the relaxation side of the reversing valve 33 of the clamping assembly (which can be the upper side of the reversing valve 33, i.e., the reversing valve is switched to the first state) is powered, and the falling side of the reversing valve 33 of the jacking assembly (which can be the upper side of the reversing valve 33, i.e., the reversing valve is switched to the first state) is powered → the pump body 2 is started → the overflow valve 7 is de-energized → the hydraulic oil passes through the second check valve 6, the second on-off valve 5, the pressure reducing valve 35, the reversing valve 33 of the clamping assembly → the hydraulic control check valve 32 of the clamping assembly is opened → under the action of the clamping cylinder spring force, the hydraulic oil in the clamping cavity of the clamping cylinder flows back to the oil tank through the first one-way throttle valve 36 or the second one-way throttle valve 37 of the clamping assembly, the first on-off valve 39 of the clamping assembly, the hydraulic control check valve 32 of the clamping assembly, the reversing valve 33 of the clamping assembly, and the first check valve 34 of the clamping assembly.

[0103] 2) Jacking:

[0104] The clamping cylinder is relaxed to the position → the overflow valve 7 is powered, the relaxation side of the reversing valve 33 of the clamping assembly is powered, and the jacking side of the reversing valve 33 of the jacking assembly (which can be the lower side of the reversing valve 33, i.e., the reversing valve is switched to the second state) is powered → the pump body 2 is started → the overflow valve 7 is de-energized → the hydraulic oil flows to the jacking cavity of the jacking cylinder through the second check valve 6, the second on-off valve 5, the reversing valve 33 of the jacking assembly, the hydraulic control check valve 32 of the jacking assembly, the first on-off valve 39 of the jacking assembly, the first one-way throttle valve 36 or the second one-way throttle valve 37 of the jacking assembly → the workbench is jacked up.

[0105] 3) Lowering:

[0106] The overflow valve 7 is powered, the lowering side of the reversing valve 33 of the clamping assembly is powered, the lowering side of the reversing valve 33 of the lifting assembly is powered → the pump body 2 is started → the overflow valve 7 is powered off → the hydraulic oil flows through the second check valve 6, the second on-off valve 5, the reversing valve 33 of the lifting assembly → the hydraulic control check valve 32 of the lifting assembly is opened → under the action of the workbench and the mold gravity, the hydraulic oil of the lifting cavity flows back to the oil tank through the first check throttle valve 36 or the second check throttle valve 37 of the lifting assembly, the first on-off valve 39 of the lifting assembly, the hydraulic control check valve 32 of the lifting assembly, the reversing valve 33 of the lifting assembly, and the first check valve 34 of the lifting assembly.

[0107] 4) Clamping:

[0108] The lifting cylinder is lowered to the position → the overflow valve 7 is powered, the clamping side of the reversing valve 33 of the clamping assembly (which can be the lower side of the reversing valve 33, that is, the reversing valve switches to the second state) is powered, and the lowering side of the reversing valve 33 of the lifting assembly is powered → the pump body 2 is started → the overflow valve 7 is powered off → the hydraulic oil flows through the second check valve 6, the second on-off valve 5, the pressure reducing valve 35, the reversing valve 33 of the clamping assembly, the hydraulic control check valve 32 of the clamping assembly, the first on-off valve 39 of the clamping assembly, the first check throttle valve 36 or the second check throttle valve 37 of the clamping assembly to the clamping cavity of the clamping cylinder → the workbench is clamped.

[0109] 5) Pressure compensation:

[0110] When the workbench is in the lifted state, if the pressure of the first pressure sensor 38 of the lifting assembly is lower than the set value, the pump body 2 is started, and when the pressure reaches the set value of the second pressure sensor 4, the pump body 2 is stopped.

[0111] When the workbench is in the clamped state, if the pressure of the first pressure sensor 38 of the clamping assembly is lower than the set value, the pump body 2 is started, and when the pressure reaches the set value of the second pressure sensor 4, the pump body 2 is stopped.

[0112] 6) Pressureless starting:

[0113] When the pump body 2 receives a starting command, the overflow valve 7 is first powered, and then the pump body 2 is started. After the pump body 2 is started, the overflow valve 7 is powered off to start pressure building.

[0114] 7) Safety protection:

[0115] When the pressure is greater than the allowable value of the system, the electromagnetic overflow valve 7 is forced to open, controlling the pressure within a certain range and avoiding damage to the hydraulic system components.

[0116] 8) Abnormal alarm:

[0117] When the system pressure fails to reach the set value and the pressure compensation times out, the system alarms and stops.

[0118] Beneficial effects: the lifting cavity oil circuit of the lifting cylinder and the oil circuit of the clamping cavity of the clamping cylinder are both provided with the hydraulic control check valve 32, and the pressure maintaining capability of the working cavity is enhanced.

[0119] The pneumatic pump or the accumulator in the conventional scheme is cancelled (the pressure maintaining capability of the accumulator system is lower than that of the hydraulic control check valve 32, and the pressure reduction is faster than that of the sealing cavity of the hydraulic control check valve 32), the starting frequency of the motor pump is reduced, and the energy consumption is reduced.

[0120] The electromagnetic overflow valve 7 is adopted, the electromagnetic overflow valve 7 is electrified before the motor pump starts, the electromagnetic overflow valve 7 is de-energized to build pressure after no-pressure starting, the safety protection function of the overflow valve 7 can be played, the system heating can be reduced, and the service life of the components is improved.

[0121] The pressure sensors arranged in the lifting cavity and the clamping cavity can monitor the system pressure, the motor pump starts when the pressure is lower than the required value, the system alarms and stops when the pressure compensation time exceeds the set value, the pressure deficiency is prompted, and the stability of the working hydraulic pressure is ensured.

[0122] When the workbench has the actions of lifting, clamping or opening in and opening out, the motor pump starts, and the pump stops when the pressure reaches the set value of the pressure sensor, and the stability of the hydraulic pressure in the above-mentioned action process is ensured.

[0123] The circuits of the clamping cylinder and the lifting cylinder are both provided with the check valve, and the synchronism of the actions of the execution units 31 is ensured.

[0124] The main pipeline and the branch oil circuits (clamping / release, lifting / falling) of the two execution assemblies 3 are both provided with a ball valve, when the system fails, the fault point is conveniently checked, and the fault loss is reduced.

[0125] The oil return circuit is provided with the first check valve 34, the pipeline has corresponding oil when the system is static, the pressure building efficiency is improved.

[0126] Although the above-mentioned embodiments have been shown and described, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as the limitation of the utility model, the changes, modifications, replacements and modifications of the above-mentioned embodiments made by the ordinary skilled in the art are within the protection scope of the utility model.

Claims

1. A hydraulic drive system, characterized in that, include: A container for storing hydraulic fluid, and a pump body connected to the container for driving the flow of the hydraulic fluid. At least one actuating component, the actuating component being connected to the pump body, and the actuating component comprising: An execution unit is configured to perform driving actions during the operation of the pump body; A hydraulically controlled check valve is connected between the actuator and the pump body and is used to prevent the backflow of hydraulic fluid in the actuator. The hydraulically controlled check valve is provided with a hydraulically controlled interface for connection to the pump body to drive the hydraulically controlled check valve to open when the pump body is running, so that the hydraulic fluid in the actuator is discharged back to the container.

2. The hydraulic drive system according to claim 1, characterized in that, The hydraulic control check valve has a first interface and a second interface. The first interface is connected to the pump body or the container, and the second interface is connected to the execution unit. The first interface and the second interface are used to connect when hydraulic fluid is introduced into the first interface or the hydraulic control interface.

3. The hydraulic drive system according to claim 2, characterized in that, The actuation component includes a reversing valve, which has a first port, a second port, a third port and a fourth port. The first port is connected to the pump body, the second port is connected to the container, the third port is connected to the first interface, and the fourth port is connected to the hydraulic control interface. The reversing valve has a first state and a second state. In the first state, the first port and the fourth port are connected, and the second port and the third port are connected. In the second state, the first port and the third port are connected, and the second port and the fourth port are connected.

4. The hydraulic drive system according to claim 3, characterized in that, The actuating component includes a first check valve disposed between the second port and the container, and the first check valve is used to prevent the hydraulic fluid in the container from flowing back to the second port.

5. The hydraulic drive system according to claim 3, characterized in that, The actuating component includes a pressure reducing valve disposed between the pump body and the first port.

6. The hydraulic drive system according to claim 1, characterized in that, The actuation component includes a first one-way throttle valve and a second one-way throttle valve, both of which are connected between the actuation unit and the hydraulically controlled one-way valve. When the actuator enters the hydraulic fluid, the first one-way throttle valve is connected between the hydraulically controlled one-way valve and the actuator. When the hydraulic fluid in the actuator is discharged, the second one-way throttle valve is connected between the hydraulically controlled one-way valve and the actuator.

7. The hydraulic drive system according to claim 6, characterized in that, The execution component includes multiple execution units, a first one-way throttle valve, and a second one-way throttle valve, and each execution unit and the hydraulic control one-way valve are provided with a first one-way throttle valve and a second one-way throttle valve.

8. The hydraulic drive system according to claim 1, characterized in that, The execution component includes: A first pressure sensor is disposed between the hydraulic check valve and the actuator; And / or, a first on / off valve, wherein the first on / off valve is located between the hydraulically controlled check valve and the actuator.

9. The hydraulic drive system according to claim 1, characterized in that, Also includes: A second pressure sensor is disposed between the actuator and the pump body; And / or, a second on / off valve, the second on / off valve being disposed between the actuator and the pump body; And / or, a second check valve, the second check valve being disposed between the actuator and the pump body.

10. The hydraulic drive system according to claim 1, characterized in that, It also includes an overflow valve, which is arranged in parallel with the pump body. The overflow valve, the pump body, and the container form a cycle, and the overflow valve is used to open before the pump body is started and close after the pump body is started.

11. The hydraulic drive system according to claim 1, characterized in that, It also includes a filter, which is disposed at at least one of the inlet and outlet of the pump body.

12. The hydraulic drive system according to any one of claims 1-11, characterized in that, The execution components are two in number, one of which is a clamping unit and the other is a lifting unit.

13. A press, characterized in that, Includes the hydraulic drive system as described in any one of claims 1-12 above.

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