Modularized flexible electro-hydraulic servo control system

Abstract

The utility model discloses a modularized flexible electro-hydraulic servo control system, which relates to the technical field of hydraulic pressure, and comprises at least two oil cylinders, at least two valve groups, at least two electro-hydraulic servo modules and a controller, the controller is connected with an oil supply loop of the oil cylinder and used for obtaining pressure information of the oil supply loop of the oil cylinder. The controller is connected with the electro-hydraulic servo module and is used for controlling the working state of the electro-hydraulic servo module; the controller is connected with the valve group and is used for controlling the on-off state of the valve group so as to switch an oil supply loop of the oil cylinder; the electro-hydraulic servo module is connected with the oil cylinder through the valve set, and the electro-hydraulic servo module supplies oil to the oil cylinder through the oil supply loop. According to the electro-hydraulic servo module, the oil supply loops of the oil cylinders can be conveniently switched through modular design, and the utilization rate of the electro-hydraulic servo module is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to a modular flexible electro-hydraulic servo control system. Background Art

[0002] In the field of hydraulic control, independent cylinders are usually used to provide separate oil pump control, which can ensure that the oil supply circuit is not disturbed. However, for large hydraulic presses, the main cylinder needs to move with a large stroke and high pressure, which requires a large oil pump, and other independent cylinders also need to be equipped with corresponding oil pumps, making the hydraulic system bloated and the oil pump utilization rate low. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a modular flexible electro-hydraulic servo control system, which can flexibly switch the oil supply circuit of the cylinder and improve the utilization rate of the electro-hydraulic servo module.

[0004] In order to solve the above technical problems, the utility model provides a modular flexible electro-hydraulic servo control system, including at least two cylinders, at least two valve groups, at least two electro-hydraulic servo modules and a controller; the controller is connected to the oil supply circuit of the cylinder for obtaining pressure information of the oil supply circuit; the controller is connected to the electro-hydraulic servo module for controlling the working state of the electro-hydraulic servo module; the controller is connected to the valve group for controlling the on-off state of the valve group to switch the oil supply circuit; the electro-hydraulic servo module is connected to the cylinder through the valve group, and the electro-hydraulic servo module supplies oil to the cylinder through the oil supply circuit.

[0005] As an improvement of the above scheme, the modular flexible electro-hydraulic servo control system includes a master cylinder module, at least one slave cylinder module and a controller, the master cylinder module includes a master cylinder, a main control valve and at least one main electro-hydraulic servo module, and the slave cylinder module includes at least one slave cylinder, a slave control valve and at least one slave electro-hydraulic servo module; the controller is connected to the oil supply circuit of the master cylinder and the slave cylinder, and is used to obtain the pressure information of the oil supply circuit of the master cylinder and the slave cylinder; the controller is respectively connected to the main electro-hydraulic servo module and the slave electro-hydraulic servo module, and is used to control the working state of the main electro-hydraulic servo module and the slave electro-hydraulic servo module; the controller is respectively connected to the main control valve and the slave control valve, and is used to control the on-off state of the main control valve and the slave control valve to switch the oil supply circuit of the master cylinder and the slave cylinder; the main electro-hydraulic servo module is connected to the master cylinder, and the slave electro-hydraulic servo module is connected to the master cylinder through the main control valve and is connected to the slave cylinder through the slave control valve.

[0006] As an improvement of the above solution, the master cylinder module further includes a master pressure sensor, and the controller obtains the oil supply circuit pressure information of the master cylinder through the master pressure sensor.

[0007] As an improvement of the above solution, the auxiliary cylinder module further includes an auxiliary pressure sensor, and the controller obtains the pressure information of the oil supply circuit of the auxiliary cylinder through the auxiliary pressure sensor.

[0008] As an improvement of the above solution, the master cylinder module further includes a master one-way valve corresponding to the master electro-hydraulic servo module, and the master electro-hydraulic servo module is connected to the master cylinder via the master one-way valve.

[0009] As an improvement of the above solution, the auxiliary cylinder module also includes an auxiliary check valve corresponding to the auxiliary electro-hydraulic servo module one by one, and the auxiliary electro-hydraulic servo module is connected to the main control valve and the auxiliary control valve respectively through the auxiliary check valve.

[0010] As an improvement of the above solution, the electro-hydraulic servo module is powered by a power supply bus.

[0011] As an improvement of the above solution, the electro-hydraulic servo module is connected to the controller via a control bus.

[0012] As an improvement of the above solution, the electro-hydraulic servo module includes a servo driver connected to the controller and an electro-hydraulic servo motor connected to the servo driver.

[0013] The implementation of this utility model has the following beneficial effects:

[0014] The utility model can specifically control the working state of the electro-hydraulic servo module and the on-off state of the valve group, so that each cylinder can work independently according to different actions, and can also work in combination according to the characteristics of large flow and large pressure, so as to realize modular combination;

[0015] The utility model designs each oil pump as an independent module, and the modules can be increased or decreased as needed in a modular manner, thereby shortening the design time of the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the first embodiment of the modular flexible electro-hydraulic servo control system of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the electro-hydraulic servo module in the utility model;

[0018] Figure 3 This is a schematic structural diagram of a second embodiment of the modular flexible electro-hydraulic servo control system of the utility model;

[0019] Figure 4It is a structural schematic diagram of the third embodiment of the modular flexible electro-hydraulic servo control system of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0021] See also Figure 1 , Figure 1 The first embodiment of the modular flexible electro-hydraulic servo control system of the utility model is shown, which includes at least two cylinders, at least two valve groups, at least two electro-hydraulic servo modules and a controller.

[0022] Specifically:

[0023] The controller is connected to the oil supply circuit of the oil cylinder to obtain pressure information of the oil supply circuit;

[0024] The controller is connected to the electro-hydraulic servo module and is used to control the working state of the electro-hydraulic servo module;

[0025] The controller is connected to the valve group and is used to control the on / off state of the valve group to switch the oil supply circuit;

[0026] The electro-hydraulic servo module is connected to the oil cylinder through a valve group, and the electro-hydraulic servo module supplies oil to the oil cylinder according to an oil supply circuit.

[0027] Furthermore, the controller is preferably a Siemens 1500 series PLC, but is not limited to this. As long as the working state of the electro-hydraulic servo module and the on-off state of the valve group can be controlled according to the control instructions uploaded by the user, it has strong flexibility.

[0028] Therefore, users can use the controller to specifically control the working state of the electro-hydraulic servo module and the on-off state of the valve group according to the pressure information of each oil supply circuit, so that each cylinder can work independently according to different actions, or merge according to the characteristics of large flow and high pressure, thus realizing modular combination.

[0029] like Figure 2 As shown, in the present invention, each electro-hydraulic servo module is designed to have the same structure, wherein the electro-hydraulic servo module includes a servo driver and an electro-hydraulic servo motor.

[0030] The electro-hydraulic servo module is powered by a power supply bus and connected to the controller via a control bus, so that the electro-hydraulic servo module can be freely connected in parallel according to the actual demand quantity, and has the function of changing the master-slave grouping of the electro-hydraulic servo in real time according to the working conditions.

[0031] See also Figure 3 , Figure 3 The second embodiment of the modular flexible electro-hydraulic servo control system of the utility model is shown. Figure 1 The difference from the first embodiment shown is that the modular flexible electro-hydraulic servo control system in this embodiment includes a master cylinder module, a slave cylinder module and a controller, the master cylinder module includes a master cylinder, a main control valve YV5 and two main electro-hydraulic servo modules (main electro-hydraulic servo module 1# and main electro-hydraulic servo module 2#), and the slave cylinder module includes two slave cylinders (upper ejection cylinder and lower ejection cylinder), a slave control valve YV6 and two slave electro-hydraulic servo modules (slave electro-hydraulic servo module 3# and slave electro-hydraulic servo module 4#). Specifically:

[0032] The controller is connected to the oil supply circuits of the master cylinder and the slave cylinder, and is used to obtain pressure information of the oil supply circuits of the master cylinder and the slave cylinder;

[0033] The controller is connected to the main electro-hydraulic servo module and the auxiliary electro-hydraulic servo module respectively, and is used to control the working states of the main electro-hydraulic servo module and the auxiliary electro-hydraulic servo module;

[0034] The controller is connected to the main control valve YV5 and the auxiliary control valve YV6 respectively, and is used to control the on-off state of the main control valve YV5 and the auxiliary control valve YV6 to switch the oil supply circuits of the main cylinder and the auxiliary cylinder;

[0035] The main electro-hydraulic servo module is connected to the main cylinder, and the auxiliary electro-hydraulic servo module is connected to the main cylinder through the main control valve YV5 and to the auxiliary cylinder through the auxiliary control valve YV6.

[0036] In this embodiment, four electro-hydraulic servo modules (main electro-hydraulic servo module 1#, main electro-hydraulic servo module 2#, auxiliary electro-hydraulic servo module 3# and auxiliary electro-hydraulic servo module 4#) are used to control the main cylinder and two auxiliary cylinders (upper ejection cylinder and lower ejection cylinder).

[0037] Therefore, the utility model designs each oil pump as an independent module, so that the modules can be increased or decreased as needed, thus shortening the control system design time.

[0038] Furthermore, the master cylinder module also includes a master pressure sensor P1, and the controller obtains the pressure information of the master cylinder through the master pressure sensor P1; the slave cylinder module also includes a slave pressure sensor P2, and the controller obtains the pressure information of the slave cylinder through the slave pressure sensor P2.

[0039] That is to say, in the utility model, by configuring a main pressure sensor P1 in the oil supply circuit of the main cylinder and sharing a secondary pressure sensor P2 in the oil supply circuits of the upper ejection cylinder and the lower ejection cylinder, real-time collection of pressure information of the main cylinder oil supply circuit and the secondary cylinder oil supply circuit is achieved with high accuracy.

[0040] See also Figure 4 , Figure 4 The third embodiment of the modular flexible electro-hydraulic servo control system of the utility model is shown. Figure 3What is different from the second embodiment shown is that, in this embodiment, the master cylinder module also includes a main one-way valve (YV1, YV2) corresponding to the main electro-hydraulic servo module, and the main electro-hydraulic servo module is connected to the master cylinder through the main one-way valve (YV1, YV2); the slave cylinder module also includes a secondary one-way valve (YV3, YV4) corresponding to the secondary electro-hydraulic servo module, and the secondary electro-hydraulic servo module is respectively connected to the main control valve YV5 and the secondary control valve YV6 through the secondary one-way valve (YV3, YV4).

[0041] By setting a one-way valve (YV1, YV2, YV3, YV4) at the output end of the electro-hydraulic servo module, the reverse impact of oil pressure on the electro-hydraulic servo module can be effectively prevented, especially for certain working conditions where the specific electro-hydraulic servo does not participate in the work.

[0042] The specific workflow is as follows:

[0043] (1) When the master cylinder is running without load and the slave cylinder is running, the controller controls the main control valve YV5 to be in the disconnected state, and controls the slave control valve YV6 to be in the connected state; at this time, the controller controls the working state of the main electro-hydraulic servo module and the slave electro-hydraulic servo module according to the control instructions uploaded by the user, so that the main electro-hydraulic servo module supplies oil to the master cylinder alone, and the slave electro-hydraulic servo module supplies oil to the slave cylinder alone.

[0044] Combination Figure 3 As shown, when the main cylinder only needs to move up and down quickly for no-load operation and the upper ejection cylinder and the lower ejection cylinder also need to operate, the main control valve YV5 and the auxiliary control valve YV6 shall not be energized, so that the main control valve YV5 is in a disconnected state, and the auxiliary control valve YV6 is controlled to be in a connected state; at this time, the controller sends a control instruction to the main electro-hydraulic servo module 1# through the bus, and the main electro-hydraulic servo module 2# follows the main electro-hydraulic servo module 1# to operate, which is equivalent to the main electro-hydraulic servo module 1# and the main electro-hydraulic servo module 2# working in conjunction, which is the A combination flow; similarly, the auxiliary electro-hydraulic servo module 4# follows the auxiliary electro-hydraulic servo module 3# to operate, which is equivalent to the auxiliary electro-hydraulic servo module 3# and the auxiliary electro-hydraulic servo module 4# working in conjunction, which is the B combination flow; under this A and B grouping, the three cylinders can operate independently.

[0045] (2) When the master cylinder is running under high load, the controller controls the main control valve YV5 to be in a connected state and controls the auxiliary control valve YV5 to be in a disconnected state; at this time, the controller controls the working states of the main electro-hydraulic servo module and the auxiliary electro-hydraulic servo module according to the control instructions uploaded by the user, so that the main electro-hydraulic servo module and the auxiliary electro-hydraulic servo module supply oil to the master cylinder at the same time.

[0046] Combination Figure 3As shown, when the master cylinder needs to operate at a high load, the combined operation of the main electro-hydraulic servo module 1# and the main electro-hydraulic servo module 2# alone cannot meet the demand for high load pressure; at this time, the main control valve YV5 and the auxiliary control valve YV6 are energized to put the main control valve YV5 in a connected state, and control the auxiliary control valve YV6 to be in a disconnected state; at this time, the controller controls the main electro-hydraulic servo module 2#, the auxiliary electro-hydraulic servo module 3# and the auxiliary electro-hydraulic servo module 4# to follow the operation of the main electro-hydraulic servo module 1#, which is equivalent to the combined operation of the main electro-hydraulic servo module 1#, the main electro-hydraulic servo module 2#, the auxiliary electro-hydraulic servo module 3# and the auxiliary electro-hydraulic servo module 4#, which is the C combination flow; under the C combination flow, the master cylinder has the maximum oil pressure output, and the upper ejection cylinder and the lower ejection cylinder do not need to work at this time, which improves the utilization rate of the oil pump.

[0047] In summary, when the main cylinder moves downward to close the mold or upward to demold without load, the main cylinder uses group A for oil supply, and the main control valve YV5 must not be energized at this time; when the upper and lower ejector cylinders need to perform demolding and material withdrawal movements, group B is used for oil supply, and the auxiliary control valve YV6 must not be energized at this time; when the main cylinder needs to operate under high load, the main cylinder uses group C for oil supply, and the upper and lower ejector cylinders do not need to operate at this time, and both the main control valve YV5 and the auxiliary control valve YV6 need to be energized.

[0048] Furthermore, in the group A mode, the main electro-hydraulic servo module 1# and the main electro-hydraulic servo module 2# can dynamically adjust the speed according to the parameters set by the user and the feedback from the main pressure sensor P1, and only one of them is allowed to run when the flow demand is not large; in the group B mode, the auxiliary electro-hydraulic servo module 3# and the auxiliary electro-hydraulic servo module 4# can dynamically adjust the speed according to the parameters set by the user and the feedback from the auxiliary pressure sensor P2, and only one of them is allowed to run when the flow demand is not large; in the group C mode, the output capacity of the main electro-hydraulic servo module 1#, the main electro-hydraulic servo module 2#, the auxiliary electro-hydraulic servo module 3# and the auxiliary electro-hydraulic servo module 4# can be flexibly called according to the working conditions set by the user and the feedback from the main pressure sensor P1.

[0049] It should be noted that the main electro-hydraulic servo module 1# and the main electro-hydraulic servo module 2# have the same functions, and the auxiliary electro-hydraulic servo module 3# and the auxiliary electro-hydraulic servo module 4# also have the same relationship. When any module fails to work, the utility model can automatically shield the electro-hydraulic servo module, and can enable a separate oil pump to continue working, thereby extending the processing time and providing stable and sustainable production capacity.

[0050] Accordingly, since the utility model adopts an electro-hydraulic servo system, when the oil pressure of the cylinder reaches the preset pressure, the controller can control the electro-hydraulic servo module to enter a low-speed pressure-maintaining condition, and utilize the high response characteristics of the servo motor to cut off the output when the equipment is on standby, so that it can be quickly activated at any time; this greatly reduces energy consumption compared to ordinary oil pump motors.

[0051] In summary, the utility model solves the problem that different oil cylinders require oil pumps of different sizes and the configuration is complex and changeable in a modular way, solves the problem of low utilization rate when the oil pump is not needed in certain working conditions, and solves the energy waste problem that ordinary oil pump systems need to keep running even when the equipment is in a waiting state.

[0052] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A modular flexible electro-hydraulic servo control system, characterized in that: It includes at least two oil cylinders, at least two valve groups, at least two electro-hydraulic servo modules and a controller; The controller is connected to the oil supply circuit of the oil cylinder and is used to obtain pressure information of the oil supply circuit; The controller is connected to the electro-hydraulic servo module and is used to control the working state of the electro-hydraulic servo module; The controller is connected to the valve group and is used to control the on / off state of the valve group to switch the oil supply circuit; The electro-hydraulic servo module is connected to the oil cylinder via the valve group, and the electro-hydraulic servo module supplies oil to the oil cylinder via the oil supply circuit.

2. The modular flexible electro-hydraulic servo control system according to claim 1, characterized in that: It includes a master cylinder module, at least one slave cylinder module and a controller, wherein the master cylinder module includes a master cylinder, a master control valve and at least one master electro-hydraulic servo module, and the slave cylinder module includes at least one slave cylinder, a slave control valve and at least one slave electro-hydraulic servo module; The controller is connected to the oil supply circuits of the master cylinder and the slave cylinder, and is used to obtain pressure information of the oil supply circuits of the master cylinder and the slave cylinder; The controller is connected to the main electro-hydraulic servo module and the auxiliary electro-hydraulic servo module respectively, and is used to control the working states of the main electro-hydraulic servo module and the auxiliary electro-hydraulic servo module; The controller is connected to the main control valve and the auxiliary control valve respectively, and is used to control the on-off state of the main control valve and the auxiliary control valve to switch the oil supply circuits of the main cylinder and the auxiliary cylinder; The main electro-hydraulic servo module is connected to the master cylinder, and the auxiliary electro-hydraulic servo module is connected to the master cylinder through the main control valve and is connected to the auxiliary cylinder through the auxiliary control valve.

3. The modular flexible electro-hydraulic servo control system according to claim 2, characterized in that: The master cylinder module further includes a master pressure sensor, and the controller obtains pressure information of the oil supply circuit of the master cylinder through the master pressure sensor.

4. The modular flexible electro-hydraulic servo control system according to claim 2, characterized in that: The slave cylinder module further includes a slave pressure sensor, and the controller obtains pressure information of the oil supply circuit of the slave cylinder through the slave pressure sensor.

5. The modular flexible electro-hydraulic servo control system according to claim 2, characterized in that: The master cylinder module also includes a master check valve corresponding to the master electro-hydraulic servo module one by one, and the master electro-hydraulic servo module is connected to the master cylinder through the master check valve.

6. The modular flexible electro-hydraulic servo control system according to claim 2, characterized in that: The auxiliary cylinder module also includes an auxiliary check valve corresponding to the auxiliary electro-hydraulic servo module one by one, and the auxiliary electro-hydraulic servo module is connected to the main control valve and the auxiliary control valve respectively through the auxiliary check valve.

7. The modular flexible electro-hydraulic servo control system according to claim 1, characterized in that: The electro-hydraulic servo module is powered by a power supply bus.

8. The modular flexible electro-hydraulic servo control system according to claim 1, characterized in that: The electro-hydraulic servo module is connected to the controller via a control bus.

9. The modular flexible electro-hydraulic servo control system according to claim 1, characterized in that: The electro-hydraulic servo module includes a servo driver connected to the controller and an electro-hydraulic servo motor connected to the servo driver.

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