Oil cylinder linkage hydraulic control system

Abstract

The utility model provides an oil cylinder linkage hydraulic control system, which relates to the technical field of hydraulic control and comprises a first oil cylinder, a second oil cylinder, a first oil inlet control valve group, a second oil inlet control valve group, a first oil return control valve group, a second oil return control valve group and a pressure control valve group. A rod cavity of the first oil cylinder is communicated with a rod cavity of the second oil cylinder, and the rod cavity of the first oil cylinder and the rod cavity of the second oil cylinder are communicated with the oil tank through a first control one-way valve. A first sensing element and a second sensing element are arranged in the first oil cylinder and the second oil cylinder respectively and used for controlling the first control one-way valve to be opened reversely. According to the hydraulic control system, the first oil inlet and the second oil inlet are arranged to be matched with the valve sets, linkage control over the double oil cylinders can be achieved, the number of the oil pumps and the number of the matched valve sets can be reduced, and therefore the input cost is reduced, the integration degree of the hydraulic control system is higher, and the control principle is simpler.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular to a hydraulic control system for cylinder linkage. Background Technology

[0002] Hydraulic systems play a vital role in the machinery manufacturing industry. A complete hydraulic system consists of five parts: power components, actuators, control components, auxiliary components, and hydraulic oil. Depending on the specific application, appropriate control components can be selected to achieve better performance.

[0003] The actuator is typically a hydraulic cylinder, and a hydraulic control system usually controls the extension or retraction of the piston rod in one cylinder. When there are two hydraulic cylinders as actuators, each cylinder usually corresponds to a hydraulic control system, which leads to the complexity of the hydraulic control system, the cumbersome control process, and the increased cost due to the increased number of hydraulic components.

[0004] If the control system for dual hydraulic cylinders can be simplified, the cost will be significantly reduced. Utility Model Content

[0005] The purpose of this utility model is to provide a hydraulic control system for cylinder linkage to solve the problems existing in the prior art. By setting two oil inlets, a first oil inlet and a second oil inlet, and cooperating with a valve group, the linkage control of two oil cylinders can be realized. This can reduce the number of oil pumps and matching valve groups, thereby reducing investment costs. Moreover, the hydraulic control system has a higher degree of integration and a simpler control principle.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A hydraulic control system for cylinder linkage includes a first cylinder, a second cylinder, a first inlet control valve group, a second inlet control valve group, a first return control valve group, a second return control valve group, and a pressure control valve group. A first oil supply port is connected to the rodless chamber of the first cylinder and the rodless chamber of the second cylinder via the first and second inlet control valve groups, respectively. The rodless chambers of the first and second cylinders are connected to an oil tank via the first and second return control valve groups, respectively. The rod chambers of the first and second cylinders are also connected to the rod-end chambers. The first and second cylinders are connected, with their rod chambers connected to the second oil supply port via a one-way valve. The rod chambers of the first and second cylinders are also connected to the oil tank via a first control one-way valve. Furthermore, the rod chambers of the first and second cylinders are connected to the oil tank via the pressure control valve assembly. The first and second cylinders are respectively equipped with a first sensing element and a second sensing element capable of sensing the piston rod's retraction into position. The first and second sensing elements are used to control the first control one-way valve to open in the reverse direction.

[0008] In one embodiment, the first oil inlet control valve group includes a first cartridge valve and a first directional valve. The inlet of the first cartridge valve is connected to the first oil supply port, and the outlet is connected to the rodless chamber of the first cylinder. The control port is connected to the first directional valve through a first shuttle valve. The inlet of the first directional valve is connected to the first oil supply port. The opening and closing of the first cartridge valve is controlled by the first directional valve. The second oil inlet control valve group includes a second cartridge valve and a second directional valve. The inlet of the second cartridge valve is connected to the first oil supply port, and the outlet is connected to the rodless chamber of the second cylinder. The control port is connected to the second directional valve through a second shuttle valve. The inlet of the second directional valve is connected to the first oil supply port. The opening and closing of the second cartridge valve is controlled by the second directional valve.

[0009] In one embodiment, the first return oil control valve group includes a third cartridge valve and a third directional valve. The inlet of the third cartridge valve is connected to the rodless chamber of the first cylinder, the outlet is connected to the oil tank, and the control port is connected to the third directional valve. The inlet of the third directional valve is connected to the rodless chamber of the first cylinder, and the opening and closing of the third cartridge valve is controlled by the third directional valve. The second return oil control valve group includes a fourth cartridge valve and a fourth directional valve. The inlet of the fourth cartridge valve is connected to the rodless chamber of the second cylinder, the outlet is connected to the oil tank, and the control port is connected to the fourth directional valve. The inlet of the fourth directional valve is connected to the rodless chamber of the second cylinder, and the opening and closing of the fourth cartridge valve is controlled by the fourth directional valve.

[0010] In one embodiment, the pressure control valve group includes a fifth cartridge valve, a fifth directional valve, and a relief valve. The oil inlet of the fifth cartridge valve is connected to the rod chamber of the first cylinder and the rod chamber of the second cylinder, and the oil outlet is connected to the oil tank. The control port is connected to the oil tank through the fifth directional valve. The oil inlet of the relief valve is connected to the control port of the fifth cartridge valve, and the oil outlet is connected to the oil tank.

[0011] In one embodiment, the first reversing valve, the second reversing valve, the third reversing valve, the fourth reversing valve, and the fifth reversing valve are all electromagnetic reversing valves.

[0012] In one embodiment, the first control check valve is a first hydraulically controlled check valve; the first sensing element includes a sixth cartridge valve, the control port of which is connected to the rodless chamber of the first cylinder; as the piston rod in the first cylinder moves, the oil inlet of the sixth cartridge valve is connected to the rod chamber or rodless chamber of the first cylinder; the oil outlet of the sixth cartridge valve is connected to the control port of the first hydraulically controlled check valve through a third shuttle valve; the second sensing element includes a seventh cartridge valve, the control port of which is connected to the rodless chamber of the second cylinder; as the piston rod in the second cylinder moves, the oil inlet of the seventh cartridge valve is connected to the rod chamber or rodless chamber of the first cylinder; the oil outlet of the seventh cartridge valve is connected to the control port of the first hydraulically controlled check valve through a third shuttle valve.

[0013] As one embodiment, it also includes a second hydraulic control check valve and a third hydraulic control check valve arranged in series. The oil outlet of the third shuttle valve is connected to the oil tank through the second hydraulic control check valve and the third hydraulic control check valve. The control port of the second hydraulic control check valve is connected to the rodless chamber of the first cylinder, and the control port of the third hydraulic control check valve is connected to the rodless chamber of the second cylinder.

[0014] In one embodiment, the first oil supply port and the second oil supply port are respectively connected to the first oil inlet pump and the second oil inlet pump.

[0015] The present invention has the following technical advantages over the prior art:

[0016] This invention enables the coordinated control of two oil cylinders by setting two oil inlets, a first oil inlet and a second oil inlet, in conjunction with a valve group. This reduces the number of oil pumps and associated valve groups required, thereby lowering investment costs. Furthermore, the hydraulic control system has a higher degree of integration and a simpler control principle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the hydraulic control system for cylinder linkage in one embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. First cylinder; 2. Second cylinder; 3. First oil supply port; 4. Second oil supply port; 5. First cartridge valve; 6. First directional valve; 7. First shuttle valve; 8. Second cartridge valve; 9. Second directional valve; 10. Second shuttle valve; 11. Third cartridge valve; 12. Third directional valve; 13. Fourth cartridge valve; 14. Fourth directional valve; 15. Fifth cartridge valve; 16. Fifth directional valve; 17. Relief valve; 18. First pilot-operated check valve; 19. Second pilot-operated check valve; 20. Third pilot-operated check valve; 21. Sixth cartridge valve; 22. Seventh cartridge valve; 23. Third shuttle valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The purpose of this utility model is to provide a hydraulic control system for cylinder linkage to solve the problems existing in the prior art. By setting two oil inlets, a first oil inlet and a second oil inlet, and cooperating with a valve group, the linkage control of two oil cylinders can be realized. This can reduce the number of oil pumps and matching valve groups, thereby reducing investment costs. Moreover, the hydraulic control system has a higher degree of integration and a simpler control principle.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1As shown, a hydraulic control system for cylinder linkage includes a first cylinder 1, a second cylinder 2, a first inlet control valve group, a second inlet control valve group, a first return control valve group, a second return control valve group, and a pressure control valve group. A first oil supply port 3 is connected to the rodless chamber of the first cylinder 1 and the rodless chamber of the second cylinder 2 via the first and second inlet control valve groups, respectively. The rodless chambers of the first cylinder 1 and the second cylinder 2 are connected to an oil tank via the first and second return control valve groups, respectively. The rod chamber of the first cylinder 1 and the second cylinder 2 are connected to the oil tank. The rod chamber of cylinder 2 is connected, and the rod chambers of the first cylinder 1 and the second cylinder 2 are connected to the second oil supply port 4 through a one-way valve. The rod chambers of the first cylinder 1 and the second cylinder 2 are connected to the oil tank through a first control one-way valve. The rod chambers of the first cylinder 1 and the second cylinder 2 are also connected to the oil tank through a pressure control valve group. The first cylinder 1 and the second cylinder 2 are respectively equipped with a first sensing element and a second sensing element that can sense the piston rod retracting to the correct position. The first sensing element and the second sensing element are used to control the first control one-way valve to open in the reverse direction.

[0025] In use, the first and second inlet control valve groups are open, the first and second return control valve groups are closed, and the pressure control valve group is closed (the pressure control valve group being closed means it is not energized and does not perform pressure control, but its oil circuit is fully open). This allows hydraulic oil to return directly through the pressure control valve group, with oil entering through the first supply port 3. The hydraulic oil enters the rodless chamber of the first cylinder 1 (hereinafter referred to as the first rodless chamber) through the first inlet control valve group, and then enters the rodless chamber of the second cylinder 2 (hereinafter referred to as the second rodless chamber) through the second inlet control valve group. The hydraulic oil in the rod chamber of the first cylinder 1 (hereinafter referred to as the first rod chamber) and the rod chamber of the second cylinder 2 (hereinafter referred to as the second rod chamber) can both return to the oil tank through the pressure control valve group. The piston rod in the first cylinder 1 (hereinafter referred to as the first piston rod) and the piston rod in the second cylinder 2 (hereinafter referred to as the second piston rod) extend simultaneously.

[0026] When the first piston rod needs to retract, only the first return oil control valve group opens, allowing oil to enter through the second oil supply port 4. The hydraulic oil in the first rodless chamber returns to the oil tank via the first return oil control valve group until the first piston rod retracts to its final position. After retraction, if the second oil supply port 4 continues to supply oil, the first sensing element triggers the first control check valve to open, allowing the hydraulic oil entering the first rod chamber to return to the oil tank via the first control check valve, preventing excessive oil pressure in the first rodless chamber. The principle is the same if the second piston rod needs to retract independently.

[0027] When the first piston rod is in the retracted state and the second piston rod is in the extended state, requiring the first piston rod to extend and the second piston rod to retract, the first inlet control valve group opens, the second inlet control valve group closes, the first return control valve group closes, the second return control valve group opens, and the pressure control valve group opens, thus playing a pressure control role. That is, oil can only return through the pressure control valve group when the return pressure of the first rod chamber, the return pressure of the second rod chamber, or the sum of the two reaches a certain value. Normally, oil can only be discharged through the pressure control valve group when the first rod chamber and the second rod chamber discharge oil simultaneously, or when other conditions cause the inlet pressure of the pressure control valve group to be too high. Oil is supplied to the first rodless chamber through the first inlet control valve group. When the first piston rod extends, the hydraulic oil in the first rod chamber enters the second rod chamber, increasing the oil pressure in the second rod chamber. When the second piston rod retracts, the hydraulic oil in the second rodless chamber returns to the oil tank through the second return valve group. If the second piston rod retracts to its designated position but the first piston rod has not yet extended to the specified position, and oil continues to flow into the first rodless chamber, the second sensing element triggers the first control check valve to open, and the hydraulic oil in the first rod chamber returns to the oil tank via the first control check valve. When the first piston rod is in the extended state and the second piston rod is in the retracted state, the principle is the same when the first piston rod needs to extend and the second piston rod needs to retract.

[0028] Therefore, this embodiment can achieve the linkage control of the two oil cylinders by setting two oil inlets, a first oil inlet and a second oil inlet, in conjunction with a valve group. This can reduce the number of oil pumps and matching valve groups required, thereby reducing investment costs. Moreover, the hydraulic control system has a higher degree of integration and a simpler control principle.

[0029] In this embodiment, the first oil inlet control valve group includes a first cartridge valve 5 and a first directional valve 6. The oil inlet of the first cartridge valve 5 is connected to the first oil supply port 3, and the oil outlet is connected to the first rodless chamber. The control port is connected to the first directional valve 6 through a first shuttle valve 7. The oil inlet of the first directional valve 6 is connected to the first oil supply port 3. The opening and closing of the first cartridge valve 5 is controlled by the first directional valve 6. The second oil inlet control valve group includes a second cartridge valve 8 and a second directional valve 9. The oil inlet of the second cartridge valve 8 is connected to the first oil supply port 3, and the oil outlet is connected to the second rodless chamber. The control port is connected to the second directional valve 9 through a second shuttle valve 10. The oil inlet of the second directional valve 9 is connected to the first oil supply port 3. The opening and closing of the second cartridge valve 8 is controlled by the second directional valve 9.

[0030] In this embodiment, the first return oil control valve group includes a third cartridge valve 11 and a third directional valve 12. The inlet of the third cartridge valve 11 is connected to the first rodless chamber, the outlet is connected to the oil tank, and the control port is connected to the third directional valve 12. The inlet of the third directional valve 12 is connected to the first rodless chamber, and the opening and closing of the third cartridge valve 11 is controlled by the third directional valve 12. The second return oil control valve group includes a fourth cartridge valve 13 and a fourth directional valve 14. The inlet of the fourth cartridge valve 13 is connected to the second rodless chamber, the outlet is connected to the oil tank, and the control port is connected to the fourth directional valve 14. The inlet of the fourth directional valve 14 is connected to the second rodless chamber, and the opening and closing of the fourth cartridge valve 13 is controlled by the fourth directional valve 14.

[0031] In this embodiment, the pressure control valve group includes a fifth cartridge valve 15, a fifth directional valve 16, and a relief valve 17. The oil inlet of the fifth cartridge valve 15 is connected to both the first rod chamber and the second rod chamber, and the oil outlet is connected to the oil tank. The control port is connected to the oil tank through the fifth directional valve 16. The oil inlet of the relief valve 17 is connected to the control port of the fifth cartridge valve 15, and the oil outlet is connected to the oil tank.

[0032] The first directional valve 6, the second directional valve 9, the third directional valve 12, the fourth directional valve 14, and the fifth directional valve 16 are all solenoid directional valves. When the first directional valve 6, the second directional valve 9, the third directional valve 12, and the fourth directional valve 14 are energized, the corresponding cartridge valves can conduct, that is, the corresponding control valve groups are open. When all four are de-energized, the corresponding cartridge valves cannot conduct, that is, the corresponding control valve groups are closed. When the fifth directional valve 16 in the pressure control valve group is de-energized, the hydraulic oil at the inlet of the fifth cartridge valve 15 can directly open the valve core and exit without passing through the relief valve 17. When the fifth directional valve 16 is energized, the hydraulic oil at the inlet of the fifth cartridge valve 15 cannot directly open the valve core and exit; it must pass through the relief valve 17 and overcome the relief pressure before it can exit.

[0033] In this embodiment, the first control check valve is a first hydraulically controlled check valve 18; the first sensing element includes a sixth cartridge valve 21, the control port of which is connected to the first rodless chamber; as the first piston rod moves, the oil inlet of the sixth cartridge valve 21 is connected to the first rod chamber or rodless chamber, that is, when the first piston rod is in the extended state, both the oil inlet and control port of the sixth cartridge valve 21 are connected to the first rodless chamber; when the first piston rod retracts, the sixth cartridge valve 21 cannot discharge oil; when the first piston rod retracts to between the oil inlet and control port of the sixth differential valve, the hydraulic oil in the rod chamber can open the sixth cartridge valve 21 because the oil pressure in the first rod chamber is greater than the oil pressure in the first rodless chamber; the oil outlet of the sixth cartridge valve 21 is connected to the control port of the first hydraulically controlled check valve 18 through the third shuttle valve 23, so that the first hydraulically controlled check valve 18 is reverse-guided, and the hydraulic oil that subsequently enters the first rod chamber is directly discharged into the oil tank through the first hydraulically controlled check valve 18. The second sensing element includes a seventh cartridge valve 22, the control port of which is connected to the second rodless chamber; as the second piston rod moves, the oil inlet of the seventh cartridge valve 22 is connected to the first rod chamber or rodless chamber; the oil outlet of the seventh cartridge valve 22 is connected to the control port of the first hydraulic check valve 18 through the third shuttle valve 23. The control principle of the second sensing element is the same as above.

[0034] This embodiment also includes a second hydraulic control check valve 19 and a third hydraulic control check valve 20 arranged in series. The oil outlet of the third shuttle valve 23 is connected to the oil tank through the second hydraulic control check valve 19 and the third hydraulic control check valve 20. The control port of the second hydraulic control check valve 19 is connected to the first rodless chamber, and the control port of the third hydraulic control check valve 20 is connected to the second rodless chamber.

[0035] When both the first and second piston rods are extended and need to retract simultaneously, the first and second inlet control valve groups close, while the first and second return control valve groups open. Oil enters through the second supply port 4, and oil returns from the first and second rodless chambers through the first and second return valve groups, respectively, simultaneously reversing the flow of the second hydraulic check valve 19 and the third hydraulic check valve 20. When the first and second piston rods retract to their positions, the return oil from the sixth cartridge valve 21 and the seventh cartridge valve 22 passes through the third shuttle valve 23 and further through the second hydraulic check valve 19 and the third hydraulic check valve 20 into the oil tank. When oil enters the first rodless chamber and the second rodless chamber at the same time, the second hydraulic control check valve 19 and the third hydraulic control check valve 20 also open in reverse at the same time, so that the sixth cartridge valve 21 and the seventh cartridge valve 22 do not work, thus avoiding the problem that the first hydraulic control check valve 18 opens in reverse under certain special circumstances, affecting the normal operation of the first cylinder 1 and the second cylinder 2.

[0036] As one embodiment, the first oil supply port 3 and the second oil supply port 4 are respectively connected to the first oil inlet pump and the second oil inlet pump.

[0037] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0038] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hydraulic control system for cylinder linkage, characterized in that, The system includes a first hydraulic cylinder, a second hydraulic cylinder, a first oil inlet control valve group, a second oil inlet control valve group, a first oil return control valve group, a second oil return control valve group, and a pressure control valve group. A first oil supply port is connected to the rodless chamber of the first hydraulic cylinder and the rodless chamber of the second hydraulic cylinder via the first oil inlet control valve group and the second oil inlet control valve group, respectively. The rodless chambers of the first and second hydraulic cylinders are connected to the oil tank via the first and second oil return control valve groups, respectively. The rod chamber of the first hydraulic cylinder and the rod chamber of the second hydraulic cylinder are connected, and the first... The rod chamber of the first cylinder and the rod chamber of the second cylinder are connected to the second oil supply port via a one-way valve. The rod chambers of the first cylinder and the second cylinder are connected to the oil tank via a first control one-way valve. The rod chambers of the first cylinder and the second cylinder are also connected to the oil tank via the pressure control valve group. The first cylinder and the second cylinder are respectively equipped with a first sensing element and a second sensing element that can sense the piston rod retracting to the correct position. The first sensing element and the second sensing element are used to control the first control one-way valve to open in the reverse direction.

2. The hydraulic control system for cylinder linkage according to claim 1, characterized in that, The first oil inlet control valve group includes a first cartridge valve and a first directional valve. The inlet of the first cartridge valve is connected to the first oil supply port, and the outlet is connected to the rodless chamber of the first cylinder. The control port is connected to the first directional valve through a first shuttle valve. The inlet of the first directional valve is connected to the first oil supply port. The opening and closing of the first cartridge valve is controlled by the first directional valve. The second oil inlet control valve group includes a second cartridge valve and a second directional valve. The inlet of the second cartridge valve is connected to the first oil supply port, and the outlet is connected to the rodless chamber of the second cylinder. The control port is connected to the second directional valve through a second shuttle valve. The inlet of the second directional valve is connected to the first oil supply port. The opening and closing of the second cartridge valve is controlled by the second directional valve.

3. The hydraulic control system for cylinder linkage according to claim 2, characterized in that, The first return oil control valve group includes a third cartridge valve and a third directional valve. The inlet of the third cartridge valve is connected to the rodless chamber of the first cylinder, the outlet is connected to the oil tank, and the control port is connected to the third directional valve. The inlet of the third directional valve is connected to the rodless chamber of the first cylinder, and the opening and closing of the third cartridge valve is controlled by the third directional valve. The second return oil control valve group includes a fourth cartridge valve and a fourth directional valve. The inlet of the fourth cartridge valve is connected to the rodless chamber of the second cylinder, the outlet is connected to the oil tank, and the control port is connected to the fourth directional valve. The inlet of the fourth directional valve is connected to the rodless chamber of the second cylinder, and the opening and closing of the fourth cartridge valve is controlled by the fourth directional valve.

4. The hydraulic control system for cylinder linkage according to claim 3, characterized in that, The pressure control valve assembly includes a fifth cartridge valve, a fifth directional valve, and a relief valve. The inlet of the fifth cartridge valve is connected to the rod chamber of the first cylinder and the rod chamber of the second cylinder, and the outlet is connected to the oil tank. The control port is connected to the oil tank through the fifth directional valve. The inlet of the relief valve is connected to the control port of the fifth cartridge valve, and the outlet is connected to the oil tank.

5. The hydraulic control system for cylinder linkage according to claim 4, characterized in that, The first reversing valve, the second reversing valve, the third reversing valve, the fourth reversing valve, and the fifth reversing valve are all solenoid reversing valves.

6. The hydraulic control system for cylinder linkage according to claim 1, characterized in that, The first control check valve is a first hydraulically controlled check valve; the first sensing element includes a sixth cartridge valve, the control port of which is connected to the rodless chamber of the first cylinder; as the piston rod in the first cylinder moves, the oil inlet of the sixth cartridge valve is connected to the rod chamber or rodless chamber of the first cylinder; the oil outlet of the sixth cartridge valve is connected to the control port of the first hydraulically controlled check valve through a third shuttle valve; the second sensing element includes a seventh cartridge valve, the control port of which is connected to the rodless chamber of the second cylinder; as the piston rod in the second cylinder moves, the oil inlet of the seventh cartridge valve is connected to the rod chamber or rodless chamber of the first cylinder; the oil outlet of the seventh cartridge valve is connected to the control port of the first hydraulically controlled check valve through a third shuttle valve.

7. The hydraulic control system for cylinder linkage according to claim 6, characterized in that, It also includes a second hydraulically controlled check valve and a third hydraulically controlled check valve arranged in series. The oil outlet of the third shuttle valve is connected to the oil tank through the second hydraulically controlled check valve and the third hydraulically controlled check valve. The control port of the second hydraulically controlled check valve is connected to the rodless chamber of the first cylinder, and the control port of the third hydraulically controlled check valve is connected to the rodless chamber of the second cylinder.

8. The hydraulic control system for cylinder linkage according to claim 1, characterized in that, The first oil supply port and the second oil supply port are respectively connected to the first oil inlet pump and the second oil inlet pump.

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