Hydraulic pump control system and hydraulic pump device

Abstract

The utility model discloses a hydraulic pump control system and a hydraulic pump device, the system comprises a hydraulic pump mechanism, a power control valve, a pressure control valve, an electric proportional valve and a feedback module, the hydraulic pump mechanism comprises a hydraulic pump and a hydraulic cylinder, and the power control valve is connected with a piston head in the hydraulic cylinder through a variable rod; the hydraulic pump is connected with the oil inlet end of the power control valve, the oil inlet end of the pressure control valve, the oil inlet end of the electric proportional valve and a rod cavity of the hydraulic cylinder through pipelines. The oil outlet ends of the power control valve and the pressure control valve are connected with a rodless cavity of the hydraulic cylinder through pipelines, and the oil return ends of the power control valve and the pressure control valve are connected with the oil tank; the oil outlet end of the electric proportional valve is connected with a rodless cavity of the hydraulic cylinder through a pipeline in the power control valve, a spring cavity of the electric proportional valve is connected with one end of the feedback module through a spring part, and the other end of the feedback module is connected with the variable rod. The flow control device can meet different flow control work requirements, control types are various, and the application range is wide.

Description

Technical Field

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

[0002] The existing hydraulic pump control system currently includes a hydraulic pump mechanism, a power control valve, a pressure control 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. However, the control types of the above-mentioned hydraulic pump control system are relatively small, resulting in a limited application range, and it cannot meet the different flow control work requirements 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 device, which can realize flow control work and meet different flow control work requirements, and have simple overall operation, high practicality and a wide range of applications.

[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 and a pressure control valve, the hydraulic pump mechanism including a hydraulic pump and a hydraulic cylinder, the power control valve being connected to a piston head in the hydraulic cylinder through a variable rod; further including an electric proportional valve and a feedback module, the hydraulic pump being connected to an oil inlet end of the power control valve, an oil inlet end of the pressure control valve, an oil inlet end of the electric proportional valve and a rod chamber of the hydraulic cylinder through pipelines respectively; the oil outlet ends of the power control valve and the pressure control valve are both connected to a rodless chamber of the hydraulic cylinder through pipelines, and the oil return ends of the power control valve and the pressure control valve are both connected to a fuel tank; the oil outlet end of the electric proportional valve is connected to the rodless chamber of the hydraulic cylinder through a pipeline in the power control valve, the spring chamber of the electric proportional valve is connected to one end of the feedback module through a spring portion, and the other end of the feedback module is connected to the variable rod.

[0005] As an improvement of the above solution, a piston rod is provided in the hydraulic cylinder, and the piston head of the piston rod divides the inner cavity of the hydraulic cylinder into a rod cavity and a rodless cavity. As an improvement of the above solution, a spring is provided in the rodless cavity, and the spring is sleeved on the rod portion of the piston rod.

[0006] As an improvement of the above solution, the hydraulic pump is connected to the oil inlet end of the power control valve, the oil inlet end of the pressure control valve, the oil inlet end of the electric proportional valve and the rod chamber of the hydraulic cylinder respectively through a first one-way valve.

[0007] As an improvement of the above solution, the first one-way valve is connected to the pilot hydraulic oil port through the second one-way valve.

[0008] As an improvement of the above solution, the feedback module is a feedback rod.

[0009] As an improvement of the above solution, the power control valve is connected to the rod chamber and the pressure control valve respectively through a fixed throttle hole.

[0010] As an improvement of the above solution, the hydraulic pump adopts the above hydraulic pump control system.

[0011] The implementation of this utility model has the following beneficial effects:

[0012] The hydraulic pump control system and hydraulic pump device of the utility model have a simple overall structure and low cost. They can not only realize power control and pressure control, but also realize flow control through the set electric proportional valve and feedback module to meet the different flow control work requirements of users. The hydraulic pump control system has various control types, high practicality and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the structural block diagram of the existing hydraulic pump control system;

[0014] Figure 2 It is a structural schematic diagram of the hydraulic pump control system of the utility model. DETAILED DESCRIPTION

[0015] 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.

[0016] It should be noted that if Figure 1 As shown, Figure 1 The existing hydraulic pump control system includes a hydraulic pump mechanism, a power control valve 1, a pressure control valve 2 and a fixed throttle hole 3, etc. The structural connection relationship can be seen in Figure 1 As shown. However, the existing hydraulic pump control system has few control types, which limits its application scope and cannot meet the different flow control work requirements of users. In this regard, the utility model designs a hydraulic pump control system and a hydraulic pump device to solve the existing technical problems. See below for details:

[0017] like Figure 2As shown, a specific embodiment of the utility model provides a hydraulic pump control system, including a hydraulic pump mechanism, a power control valve 1 and a pressure control valve 2. The hydraulic pump mechanism includes a hydraulic pump 4 and a hydraulic cylinder 5. A piston rod 51 is provided in the hydraulic cylinder 5. The piston head 56 of the piston rod 51 divides the inner cavity of the hydraulic cylinder 5 into a rod cavity 52 and a rodless cavity 53. A spring 54 is provided in the rodless cavity 53. The spring 54 is sleeved on the rod portion 55 of the piston rod 51.

[0018] The power control valve 1 is connected to the piston head 56 in the hydraulic cylinder 5 through the variable rod 11, and the power control valve 1 is connected to the rod chamber 52 and the pressure control valve 2 through the fixed throttle hole 3. The utility model also includes an electric proportional valve 6 and a feedback module 7. The hydraulic pump 4 is connected to the oil inlet end of the power control valve 1, the oil inlet end of the pressure control valve 2, the oil inlet end of the electric proportional valve 6 and the rod chamber 52 of the hydraulic cylinder 5 through pipelines. The hydraulic pump 4 is connected to the oil inlet (S) of the oil tank to provide hydraulic oil for the power control valve 1, the pressure control valve 2, the electric proportional valve 6 and the rod chamber 52. The oil outlet ends of the power control valve 1 and the pressure control valve 2 are connected to the rodless chamber 53 of the hydraulic cylinder 5 through pipelines, and the oil return ends of the power control valve 1 and the pressure control valve 2 are connected to the oil return end (R) of the oil tank.

[0019] It should be noted that the specific structures and control principles of the power control valve 1 and the pressure control valve 2 are all prior art and will not be described in detail here. The connection relationship between the power control valve 1 and the pressure control valve 2 can be found in Figure 2 shown.

[0020] The oil outlet end of the electric proportional valve 6 is connected to the rodless chamber 53 of the hydraulic cylinder 5 through the pipeline in the power control valve 1, the spring 54 chamber of the electric proportional valve 6 is connected to one end of the feedback module 7 through the spring portion 61, and the other end of the feedback module 7 is connected to the variable rod 11. The electric proportional valve 6 is connected to an external controller. The user can control the valve core conduction pressure of the electric proportional valve 6 through the external controller to correspond to the preset flow control work.

[0021] When the hydraulic pump 4 starts to supply oil, the displacement of the system oil circuit increases, and the oil pressure in the rod chamber 52 gradually increases. The hydraulic oil in the rod chamber 52 will push the piston head 56 of the piston rod 51 to move to the right (i.e., the piston rod 51 retracts), and at this time, the variable rod 11 and the feedback module 7 on the variable rod 11 will be driven to move, so as to press the spring part 61 through the feedback module 7, and the spring part 61 acts on the valve core of the spring 54 chamber. When the force of pressing the spring 54 is greater than the valve core conduction pressure (i.e., when the current hydraulic displacement is greater than the preset flow rate), the electric proportional valve 6 is turned on, and the hydraulic oil flowing into the electric proportional valve 6 will flow to the rodless chamber 53 of the hydraulic cylinder 5 through the pipeline of the power control valve 1; the hydraulic oil in the rodless chamber 53 will push the piston rod 51 to move to the left (i.e., the piston rod 51 extends), and the preset flow control work can be realized.

[0022] For working occasions with different flow control requirements, the corresponding valve core conduction pressure can be set by setting the corresponding adjustment proportional current of the electric proportional valve 6 to achieve the conduction control of the preset flow, thereby meeting the different flow control work requirements of the user. For example, the adjustment proportional current range of the electric proportional valve 6 is: 200-600mA, and the corresponding displacement of the hydraulic pump 4 is gmin-gmax (i.e., the 0-15° swing angle of the hydraulic pump 4). When the adjustment proportional current is larger, the corresponding displacement of the hydraulic pump 4 is larger, so the corresponding flow control work can be achieved by setting the corresponding adjustment proportional current of the electric proportional valve 6.

[0023] Among them, the pressure control valve 2 has the highest priority. When it works, the electric proportional valve 6 and the power control valve 1 will not work, and the damping hole and the housing are kept connected. The priority of the electric proportional valve 6 and the power control valve 1 is the same level control. The utility model can improve the practicality and application range of the hydraulic pump control system by increasing the control types, and the overall structure is simple and the cost is low.

[0024] Preferably, the hydraulic pump 4 is connected to the oil inlet end of the power control valve 1, the oil inlet end of the pressure control valve 2, the oil inlet end of the electric proportional valve 6 and the rod chamber 52 of the hydraulic cylinder 5 respectively through the first one-way valve 8. The hydraulic oil supplied by the hydraulic pump 4 flows to the power control valve 1, the pressure control valve 2, the electric proportional valve 6 and the rod chamber 52 of the hydraulic cylinder 5 respectively through the first one-way valve 8. The first one-way valve 8 can only conduct in one direction, that is, it can only flow in but not out, so as to effectively prevent the hydraulic oil from flowing back.

[0025] Among them, the first one-way valve 8 is also connected to the pilot hydraulic oil port (G) through the second one-way valve 9, and the second one-way valve 9 is respectively connected to the oil inlet end of the power control valve 1, the oil inlet end of the pressure control valve 2, the oil inlet end of the electric proportional valve 6 and the rod chamber 52 of the hydraulic cylinder 5. The second one-way valve 9 can be set to allow the oil introduced by the pilot hydraulic oil port to flow to the power control valve 1, the pressure control valve 2, the electric proportional valve 6 and the rod chamber 52 of the hydraulic cylinder 5 to achieve the corresponding hydraulic pilot control work. Among them, the pilot hydraulic oil port can be connected or not connected according to actual needs. The set second one-way valve 9 can only conduct in one direction, that is, it can only enter but not exit, effectively preventing the hydraulic oil from flowing back.

[0026] Preferably, the feedback module 7 is a feedback rod 71 , and the spring portion 61 is pressed by the movement of the feedback rod 71 to control the on-off of the valve core of the electric proportional valve 6 .

[0027] The utility model also provides a hydraulic pump device, which adopts the above hydraulic pump control system. Since the above hydraulic pump control system has the above technical effects, the hydraulic pump device adopting the above hydraulic pump control system should also have the above technical effects, which will not be repeated here.

[0028] To sum up, the utility model has a simple overall structure and low cost. It can not only realize power control and pressure control, but also realize flow control through the set electric proportional valve and feedback module to meet the different flow control work needs of users. The hydraulic pump control system has various control types, high practicality and a wide range of applications.

[0029] 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, comprising a hydraulic pump mechanism, a power control valve and a pressure control valve, wherein the hydraulic pump mechanism comprises a hydraulic pump and a hydraulic cylinder, and the power control valve is connected to a piston head in the hydraulic cylinder through a variable rod; It is characterized in that It also includes an electric proportional valve and a feedback module, wherein the hydraulic pump is respectively connected to the oil inlet end of the power control valve, the oil inlet end of the pressure control valve, the oil inlet end of the electric proportional valve and the rod chamber of the hydraulic cylinder through pipelines; The oil outlet ends of the power control valve and the pressure control valve are connected to the rodless chamber of the hydraulic cylinder through pipelines, and the oil return ends of the power control valve and the pressure control valve are connected to the oil tank; The oil outlet end of the electric proportional valve is connected to the rodless chamber of the hydraulic cylinder through a pipeline in the power control valve, the spring chamber of the electric proportional valve is connected to one end of the feedback module through a spring part, and the other end of the feedback module is connected to the variable rod.

2. The hydraulic pump control system according to claim 1, characterized in that: A piston rod is arranged in the hydraulic cylinder, and a piston head of the piston rod divides the inner cavity of the hydraulic cylinder into a rod cavity and a rodless cavity.

3. The hydraulic pump control system according to claim 2, characterized in that: A spring is arranged in the rodless cavity, and the spring is sleeved on the rod portion of the piston rod.

4. The hydraulic pump control system according to claim 1, characterized in that: The hydraulic pump is connected to the oil inlet end of the power control valve, the oil inlet end of the pressure control valve, the oil inlet end of the electric proportional valve and the rod chamber of the hydraulic cylinder respectively through a first one-way valve.

5. The hydraulic pump control system according to claim 4, characterized in that: The first one-way valve is connected to the pilot hydraulic oil port through the second one-way valve.

6. The hydraulic pump control system according to claim 1, characterized in that: The feedback module is a feedback rod.

7. The hydraulic pump control system according to claim 1, characterized in that: The power control valve is connected to the rod chamber and the pressure control valve respectively through fixed throttle holes.

8. A hydraulic pump device, 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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