Hydraulic pump control system and hydraulic pump

Abstract

The utility model discloses a hydraulic pump control system and a hydraulic pump, the system comprises a hydraulic pump mechanism, a power control valve, a pressure control valve and at least one group of overflow valve switching components, the hydraulic pump mechanism comprises a hydraulic pump and a hydraulic cylinder, the hydraulic pump is respectively connected with the oil inlet ends of the power control valve and the pressure control valve and a rod cavity of the hydraulic cylinder through pipelines; the hydraulic pump is connected with the oil inlet end of the overflow valve switching assembly and the adjusting end of the pressure control valve through a pipeline and a fixed throttling hole in the pipeline. The oil outlet end of the pressure control valve is connected with a rodless cavity of the hydraulic cylinder through a pipeline. The oil return end of the overflow valve switching assembly is connected with the oil tank; the overflow valve switching assembly is used for switching and controlling the overflow valves with different set pressures to work according to control signals sent by an external controller. According to the utility model, the overflow valves with different set pressures can be electrically controlled to work so as to adapt to different pressure control requirements, the operation is simple and convenient, and the working efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, in particular to a hydraulic pump control system and a hydraulic pump. Background Art

[0002] The current hydraulic pump control system includes a hydraulic pump mechanism, a power control valve, a pressure control valve, a relief valve and a fixed throttle hole, wherein the hydraulic pump mechanism includes a hydraulic pump and a hydraulic cylinder. The current hydraulic pump control system can control the operation of the hydraulic cylinder through the power control valve and realize pressure control through the pressure control valve and the relief valve. However, in response to the needs of different pressure control work, the pressure setting value of the relief valve needs to be manually adjusted back and forth, which is time-consuming and labor-intensive, and the operation is relatively inconvenient, and cannot meet the convenience needs of users. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a hydraulic pump control system and a hydraulic pump, which can electrically control the switching of relief valves with different set pressures to adapt to different pressure control requirements, and the overall operation is simple and the working efficiency is high.

[0004] In order to solve the above technical problems, the utility model provides a hydraulic pump control system, including a hydraulic pump mechanism, a power control valve, a pressure control valve and at least one group of overflow valve switching components, the hydraulic pump mechanism includes a hydraulic pump and a hydraulic cylinder, the hydraulic pump is respectively connected to the oil inlet ends of the power control valve and the pressure control valve and the rod chamber of the hydraulic cylinder through pipelines; the hydraulic pump is respectively connected to the oil inlet end of the overflow valve switching component and the regulating end of the pressure control valve through pipelines and fixed throttle holes in the pipelines, the oil outlet end of the pressure control valve is connected to the rodless chamber of the hydraulic cylinder through a pipeline; the oil return end of the overflow valve switching component is connected to the oil tank; the overflow valve switching component is used to switch and control the operation of overflow valves with different set pressures according to a control signal sent by an external controller.

[0005] As an improvement of the above scheme, the overflow valve switching assembly includes a primary overflow valve, a secondary overflow valve and a switching module; the oil inlet end of the switching module is connected to the regulating end of the pressure control valve through a pipeline, and the oil outlet end of the switching module is connected to one end of the primary overflow valve, one end of the secondary overflow valve and the oil tank through pipelines respectively; the first execution end of the switching module is connected to the other end of the primary overflow valve through a pipeline, and the second execution end of the switching module is connected to the other end of the secondary overflow valve through a pipeline; the switching module is used to switch the operation of the primary overflow valve or the secondary overflow valve according to a control signal.

[0006] As an improvement of the above solution, the switching module is a reversing valve. When the reversing valve is in a first position, the secondary overflow valve is switched to work. When the reversing valve is in a second position, the primary overflow valve is switched to work.

[0007] As an improvement of the above solution, when the reversing valve is in the middle position, the primary overflow valve and the secondary overflow valve do not work.

[0008] As an improvement of the above solution, a piston rod and a rod chamber and a rodless chamber divided by the piston rod are provided in the hydraulic cylinder.

[0009] As an improvement of the above solution, a spring is sleeved on the piston rod.

[0010] As an improvement of the above solution, both the primary relief valve and the secondary relief valve are cartridge-type relief valves.

[0011] The utility model also provides a hydraulic pump, and the hydraulic pump adopts the hydraulic pump control system mentioned above.

[0012] The implementation of this utility model has the following beneficial effects:

[0013] The hydraulic pump control system and the hydraulic pump of the utility model can switch the operation of the relief valves with different set pressures through the set relief valve switching component, and the pressure control valve cooperates with the relief valves with different set pressures to enable the hydraulic pump control system to be flexibly switched and used in operations with different pressure control requirements. It has a wide range of applications and does not require manual adjustment of the set pressure of the relief valve. It is easy to operate, saves time and effort, has high work efficiency, and can meet the convenience needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the structural block diagram of the hydraulic pump control system of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the hydraulic pump control system of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail with reference to the accompanying drawings. It is hereby stated that the directional words such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the utility model are only based on the accompanying drawings of the utility model, and are not specific limitations of the utility model.

[0017] like Figure 1As shown, a specific embodiment of the utility model provides a hydraulic pump control system, including a hydraulic pump mechanism, a power control valve 3, a pressure control valve 4 and at least one set of overflow valve switching components 5, wherein the hydraulic pump mechanism includes a hydraulic pump 1 and a hydraulic cylinder 2, wherein the hydraulic pump 1 is connected to the oil inlet end of the power control valve 3 and the pressure control valve 4 and the rod chamber 21 of the hydraulic cylinder 2 through pipelines, and the hydraulic pump 1 is connected to the oil inlet (S) of the oil tank to provide hydraulic oil to the power control valve 3, the pressure control valve 4 and the rod chamber 21. The hydraulic cylinder 2 is provided with a piston rod 22 and a rod chamber 21 and a rodless chamber 23 divided by the piston rod 22. A spring is sleeved on the piston rod 22.

[0018] It should be noted that the power control valve 3 and its power control principle are prior art and will not be described in detail here. The structural connection relationship thereof can be found in Figure 1 Schematic diagram of the electrical structure.

[0019] Specifically, the hydraulic pump 1 is connected to the oil inlet end of the overflow valve switching assembly 5 and the regulating end of the pressure control valve 4 through pipelines and fixed throttle holes 6 in the pipelines, and the oil outlet end 41 of the pressure control valve 4 is connected to the rodless chamber 23 of the hydraulic cylinder 2 through pipelines; the oil return end of the overflow valve switching assembly 5 is connected to the oil return hole (R) of the oil tank; the overflow valve switching assembly 5 is used to switch and control the operation of overflow valves with different set pressures according to a control signal sent by an external controller.

[0020] When any relief valve with a set pressure is working, it forms a B-type half bridge with the fixed throttle hole 6. The pressure of the spring chamber of the pressure control valve 4 can be adjusted by changing the relief valve with different set pressures. When the system pipeline oil pressure continues to increase, the hydraulic oil in the rod chamber 21 will push the piston rod 22 to the right (i.e., the piston rod 22 retracts); when the system pipeline oil pressure is greater than the pressure of the spring chamber and the set pressure of the relief valve, the oil outlet of the pressure control valve 4 flows through the pipeline to the rodless chamber 23 of the hydraulic cylinder 2. At this time, the hydraulic oil in the rodless chamber 23 will push the piston rod 22 to the left (i.e., the piston rod 22 extends), thus realizing pressure control. For working occasions with different pressure control requirements, by switching the relief valves with different set pressures to work, the main body of the hydraulic pump 1 can be controlled under different pressure control requirements, meeting the user's use requirements and being easy to operate.

[0021] Preferentially, if Figure 2As shown, the relief valve switching assembly 5 includes a primary relief valve 51, a secondary relief valve 52 and a switching module 53; the primary relief valve 51 and the secondary relief valve 52 have different set pressures. The oil inlet end P of the switching module 53 is connected to the regulating end 42 of the pressure control valve 4 through a pipeline, and the oil outlet end T of the switching module 53 is connected to one end of the primary relief valve 51, one end of the secondary relief valve 52 and the oil tank through pipelines; the first execution end A of the switching module 53 is connected to the other end of the primary relief valve 51 through a pipeline, and the second execution end B of the switching module 53 is connected to the other end of the secondary relief valve 52 through a pipeline; the switching module 53 is used to switch the primary relief valve 51 or the secondary relief valve 52 to work according to the control signal.

[0022] The switching module 53 is a reversing valve 531, which can perform corresponding position switching when receiving an external control signal. When the reversing valve 531 is in the first position 7, the secondary relief valve 52 is switched to work, and when the reversing valve 531 is in the second position 9, the primary relief valve 51 is switched to work. According to the use requirements of pressure control, the user can control the switching position of the reversing valve 531 to make the corresponding primary relief valve 51 or secondary relief valve 52 work to achieve the corresponding pressure control work. Its working principle is the same as the above principle, which will not be repeated here.

[0023] By switching the first-stage relief valve 51 or the second-stage relief valve 52 with different set pressures into operation, the user's usage needs can be met. There is no need to manually adjust the set pressure of the relief valve back and forth like the existing hydraulic pump 1 control system to meet the different usage needs of the user. The overall operation is inconvenient, time-consuming and labor-intensive. The utility model is easy to operate, saves time and effort, and can meet the user's convenience needs.

[0024] Furthermore, the reversing valve 531 can also be switched to the middle position 8. When the reversing valve 531 is in the middle position 8, the primary relief valve 51 and the secondary relief valve 52 do not work. At this time, the hydraulic pump 1 starts at zero pressure and is at the maximum working displacement.

[0025] It should be noted that when the reversing valve 531 is in the first position 7 or the second position 9, that is, when the primary relief valve 51 or the secondary relief valve 52 is put into operation, if the system oil pressure does not reach the relief valve set pressure, that is, when the pressure control valve 4 is not working, the hydraulic pump 1 is controlled by the power control valve 3.

[0026] Preferably, the reversing valve 531 is preferably a three-position four-way electromagnetic directional valve with explosion-proof function, but is not limited thereto.

[0027] Preferably, the primary relief valve 51 and the secondary relief valve 52 are both preferably cartridge relief valves, but this is not a limitation.

[0028] It should be noted that the pressure control valve 4 and the reversing valve 531 are both existing technologies, and their working principles are not described in detail here.

[0029] To sum up, the utility model can switch the operation of relief valves with different set pressures. Through the cooperation of the pressure control valve and the relief valves with different set pressures, the hydraulic pump control system can be flexibly switched and used in operations with different pressure control requirements. It has a wide range of applications and does not require manual adjustment of the set pressure of the relief valve. It is easy to operate, saves time and effort, has high work efficiency, and can meet the convenience needs of users.

[0030] Among them, the pressure control method includes at least three levels of pressure control, such as the first-level pressure control, the reversing valve is in the middle position, and the hydraulic pump starts at zero pressure; the second-level pressure control, when the reversing valve is in the first position, the pressure can be set (the set pressure of the second-level relief valve), at this time the pressure of the hydraulic pump is controlled by the second-level relief valve, the third-level pressure control, when the reversing valve is in the second position, the pressure can be set (the set pressure of the first-level relief valve), at this time the pressure of the hydraulic pump is controlled by the first-level relief valve. Secondly, by putting multiple relief valves in multiple groups of relief valve switching components into operation simultaneously, more levels of pressure control can be formed to meet the diverse usage needs of users. Users can adjust the number of relief valve switching components according to actual needs.

[0031] The utility model also provides a hydraulic pump, and the hydraulic pump adopts the hydraulic pump control system mentioned above.

[0032] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A hydraulic pump control system, characterized in that: It includes a hydraulic pump mechanism, a power control valve, a pressure control valve and at least one set of overflow valve switching components, wherein the hydraulic pump mechanism includes a hydraulic pump and a hydraulic cylinder, and the hydraulic pump is connected to the oil inlet ends of the power control valve and the pressure control valve and the rod chamber of the hydraulic cylinder through pipelines; The hydraulic pump is connected to the oil inlet end of the overflow valve switching assembly and the regulating end of the pressure control valve through a pipeline and a fixed throttle hole in the pipeline, and the oil outlet end of the pressure control valve is connected to the rodless chamber of the hydraulic cylinder through a pipeline; The oil return end of the overflow valve switching assembly is connected to the oil tank; The relief valve switching component is used to switch and control the operation of relief valves with different set pressures according to a control signal sent by an external controller.

2. The hydraulic pump control system according to claim 1, characterized in that: The relief valve switching assembly includes a primary relief valve, a secondary relief valve and a switching module; The oil inlet end of the switching module is connected to the regulating end of the pressure control valve through a pipeline, and the oil outlet end of the switching module is connected to one end of the primary relief valve, one end of the secondary relief valve and the oil tank through pipelines respectively; The first execution end of the switching module is connected to the other end of the primary relief valve through a pipeline, and the second execution end of the switching module is connected to the other end of the secondary relief valve through a pipeline; The switching module is used to switch the operation of the primary relief valve or the secondary relief valve according to a control signal.

3. The hydraulic pump control system according to claim 2, characterized in that: The switching module is a reversing valve. When the reversing valve is in a first position, the secondary overflow valve is switched to operate. When the reversing valve is in a second position, the primary overflow valve is switched to operate.

4. The hydraulic pump control system according to claim 3, characterized in that: When the reversing valve is in the middle position, the primary relief valve and the secondary relief valve do not work.

5. The hydraulic pump control system according to claim 1, characterized in that: The hydraulic cylinder is provided with a piston rod and a rod chamber and a rodless chamber divided by the piston rod.

6. The hydraulic pump control system according to claim 5, characterized in that: A spring is sleeved on the piston rod.

7. The hydraulic pump control system according to claim 4, characterized in that: The primary relief valve and the secondary relief valve are both cartridge relief valves.

8. A hydraulic pump, characterized in that: The hydraulic pump adopts the hydraulic pump control system described in any one of claims 1 to 7.

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