阅读说明：本技术 一种数字控制比例柱塞变量泵及泵控系统 (Digital control proportional plunger variable pump and pump control system ) 是由 朱德辉 张炳芹 张肖轩 杨伟旋 车鑫 李文锋 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种数字控制比例柱塞变量泵及泵控系统,涉及液压比例柱塞变量泵及泵控技术领域,包括微处理控制器、比例变量泵变量机构、变量柱塞泵本体、泵驱动电机、泵控单元,微处理控制器通过比例变量泵变量机构与变量柱塞泵本体连接,微处理控制器通过泵驱动电机与变量柱塞泵本体连接,变量柱塞泵本体上安装设有泵摆角传感器,泵摆角传感器与微处理控制器电性连接,变量柱塞泵本体与泵控单元连接,本发明可实现变量柱塞泵本体的单向和双向流量控制,实现对摆角的精密控制,进而可实现对油缸的速度和位置或马达的速度和转角进行精密控制,相比于传统伺服阀控油缸或马达,更高效节能,同时抗污染能力强,控制更简洁稳定。(The invention discloses a digital control proportional plunger variable pump and a pump control system, which relate to the technical field of hydraulic proportional plunger variable pumps and pump control, and comprise a microprocessor controller, a proportional variable pump variable mechanism, a variable plunger pump body, a pump driving motor and a pump control unit, wherein the microprocessor controller is connected with the variable plunger pump body through the proportional variable pump variable mechanism, the microprocessor controller is connected with the variable plunger pump body through the pump driving motor, a pump swing angle sensor is arranged on the variable plunger pump body, the pump swing angle sensor is electrically connected with the microprocessor controller, and the variable plunger pump body is connected with the pump control unit. High efficiency and energy conservation, strong pollution resistance and simpler and more stable control.)

1. The utility model provides a digital control proportion plunger variable pump and pump control system which characterized in that: comprises a micro-processing controller (1), a variable mechanism (2) of a proportional variable pump, a variable plunger pump body (3), a pump driving motor (4) and a pump control unit (6), the micro-processing controller (1) is connected with the variable plunger pump body (3) through the variable mechanism (2) of the proportional variable pump, the micro-processing controller (1) is connected with the variable plunger pump body (3) through the pump driving motor (4), a pump swing angle sensor (5) is arranged on the variable plunger pump body (3), the pump swing angle sensor (5) is electrically connected with the micro-processing controller (1), the variable plunger pump body (3) comprises a first pump oil inlet and outlet (34) and a second pump oil inlet and outlet (35), the variable plunger pump body (3) is communicated with the pump control unit (6) through the first pump oil inlet and outlet (34) and the second pump oil inlet and outlet (35) respectively.

2. The digitally controlled proportional plunger variable displacement pump and pump control system of claim 1, wherein: the variable mechanism (2) of the proportional variable pump comprises a valve body (21), a coupler (22), a mounting plate (23) and a digital driving motor (24) which is electrically connected with the micro-processing controller (1), wherein the valve body (21) is cylindrical, one end of the valve body (21) is provided with a first groove (211), the other end of the valve body (21) is provided with a second groove (213), the inner axial direction of the valve body (21) is provided with a central through hole (212) which is communicated with the first groove (211) and the second groove (213), the valve body (21) is provided with one end of the first groove (211) and the mounting plate (23) which are fixedly connected, the center of the mounting plate (23) is provided with a first through hole (231) which is axially penetrated, the digital driving motor (24) is fixedly connected with the mounting plate (23), and the output end of the digital driving motor (24) penetrates through the first through hole (231) and extends into the first groove (211), a valve core (25) is arranged in the valve body (21), one end of the valve core (25) is connected with the output end of the digital driving motor (24) in the first groove (211) through the coupler (22), the other end of the valve core (25) penetrates through the central through hole (212) and extends into the second groove (213), a plunger (26) is axially sleeved in the second groove (213), and a third groove (2611) sleeved with one end of the valve core (25) in the second groove (213) is arranged at one end of the plunger (26).

3. The digitally controlled proportional plunger variable displacement pump and pump control system of claim 2, wherein: the valve core (25) is connected with the coupler (22) through a spline.

4. The digitally controlled proportional plunger variable displacement pump and pump control system of claim 2, wherein: the plunger (26) comprises a first plunger body (261) and a second plunger body (262) which are coaxial and have unequal outer diameters, the outer diameter of the first plunger body (261) is larger than that of the second plunger body (262), the first plunger body (261) is sleeved with the inner side wall of the second groove (213), the third groove (2611) is arranged on the first plunger body (261), the second plunger body (262) and the first plunger body (261) are of an integrated structure, and an oil cavity (2621) is formed in the opposite end of the connecting end of the second plunger body (262) and the first plunger body (261).

5. A digitally controlled proportional piston variable displacement pump and pump control system as claimed in claim 3, wherein: the valve is characterized in that a first oil hole (2612) communicated with the inner side wall of the third groove (2611) is formed in the end face of one end, provided with the third groove (2611), of the first plunger body (261), a plunger oil inlet hole (2613) and a plunger oil return hole (2614) which are communicated with the third groove (2611) are radially formed in the side wall of one end, provided with the third groove (2611), of the first plunger body (261), a valve body oil inlet hole (214) corresponding to the plunger oil inlet hole (2613) and a valve body oil return hole (215) corresponding to the plunger oil return hole (2614) are radially formed in the outer side wall of the valve body (21), and an annular groove (251) is formed in the side wall of one end, sleeved with the plunger (26), of the valve core (25).

6. The digitally controlled proportional plunger variable displacement pump and pump control system of claim 4, wherein: the variable mechanism (2) of the proportional variable pump further comprises a high-pressure oil pipe (P1) and an oil return pipe (T1), the high-pressure oil pipe (P1) is connected with the valve body oil inlet hole (214) and the oil cavity (2621) respectively, and the oil return pipe (T1) is connected with the valve body oil return hole (215).

7. The digitally controlled proportional plunger variable displacement pump and pump control system of claim 4, wherein: the outer side wall of the valve core (25) is in threaded connection with a screw nut (27), and the outer side wall of the screw nut (27) is fixedly connected with the inner side wall of the central through hole (212).

8. A digitally controlled proportional piston variable displacement pump and pump control system as claimed in claim 3, wherein: the variable displacement plunger pump is characterized in that the variable displacement plunger pump body (3) is an inclined disc type variable displacement plunger pump, the variable displacement plunger pump body (3) comprises an inclined disc (31), two ends of the inclined disc (31) are respectively connected with a pump plunger (32), a pump inclined disc rotating shaft (33) is arranged at the center of the inclined disc (31), one end of the inclined disc (31) is movably connected with the second plunger body (262), and the reciprocating motion of the second plunger body (262) drives the inclined disc (31) to rotate around the pump inclined disc rotating shaft (33) so as to change the displacement of the variable displacement plunger pump body (3).

9. The digitally controlled proportional plunger variable displacement pump and pump control system of claim 1, wherein: the pump control unit (6) comprises an oil cylinder (61), a first liquid filling one-way valve (62) and a second liquid filling one-way valve (63), one end of the oil cylinder (61) is communicated with the first pump oil inlet and outlet (34) through the first liquid filling one-way valve (62), the other end of the oil cylinder (61) is communicated with the second pump oil inlet and outlet (35) through the second liquid filling one-way valve (63), an oil cylinder displacement sensor (64) is arranged on the oil cylinder (61), and the oil cylinder displacement sensor (64) is electrically connected with the micro-processing controller (1).

10. The digitally controlled proportional plunger variable displacement pump and pump control system of claim 1, wherein: the pump control unit (6) comprises a motor (65), a third liquid filling one-way valve (66) and a fourth liquid filling one-way valve (67), one end of the motor (65) is communicated with the first pump oil inlet and outlet (34) through the third liquid filling one-way valve (66), the other end of the oil cylinder (65) is communicated with the second pump oil inlet and outlet (35) through the fourth liquid filling one-way valve (67), a motor rotation angle sensor (68) is arranged on the motor (65), and the motor rotation angle sensor (68) is electrically connected with the micro-processing controller (1).

Technical Field

The invention relates to the technical field of hydraulic proportional plunger variable pumps and pump control, in particular to a digital control proportional plunger variable pump and a pump control system.

Background

With the development of automation, informatization and energy conservation in the industry, more and more hydraulic control systems adopt a pump control servo system, the pump control system has no throttling loss compared with a valve control system, and the energy-saving effect is excellent, and the core element of the pump control system is a proportional variable pump, and the quality of the pump control system directly determines the control precision, rapidity, stability, reliability and energy-saving efficiency of the system. The proportional variable pump commonly used in the market is an electronic variable plunger pump adopting a proportional valve or a servo valve to control a variable mechanism, and a pump control system is formed by combining the electronic variable plunger pump with a common motor, such as Leishile company. Another pump control system in the market is a pump control system consisting of an internal gear constant displacement pump and a high-power servo motor, such as the company fuitt.

The conventional variable structure of the proportional variable plunger pump consisting of a proportional valve or a servo valve in the current market is a valve-controlled oil cylinder system, the quality of the control quality of the variable structure is determined by the quality of the proportional valve or the servo valve and the control quality of a controller, and the dynamic quality of the proportional valve is poor due to large dead zone, so that the requirement on high-frequency-response high-precision control quality cannot be met; the high-frequency response proportional servo valve and the servo valve have high control precision and high frequency response, can meet the requirements for controlling the variable structure of the variable pump, have high requirements for the cleanliness of oil, poor reliability, complex control algorithm parameters, poor adaptability, high requirements for users, frequent nozzle blockage, nozzle corrosion and valve core jamming faults, and are expensive, and a pump control system can be formed by adopting a constant-speed motor to drive the proportional variable pump.

Another pump control system in the market, which consists of a fixed displacement pump and a servo motor, is widely used in speed control occasions (equivalent to open-loop control occasions) which have low control quality and require energy conservation. Because the volumetric efficiency of the pump is low in efficiency but the dynamic response of the servo motor is low when the rotating speed is low, and the constant delivery pump is mostly a one-way pump, a valve control loop formed by matching with a reversing valve is needed to form a pump control system, the accurate and rapid position control of an actuating mechanism cannot be realized, and the pump cannot be in a low rotating speed working condition for a long time.

Because of the defects of the two pump control systems, how to provide an integrated digital controller, a variable pump with high precision, quick response, good stability and strong pollution resistance and a pump control system are technical problems which need to be solved in the field urgently.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a digitally controlled proportional plunger variable displacement pump and a pump control system.

The purpose of the invention is realized by the following technical scheme: the utility model provides a digital control proportion plunger variable pump and pump control system, includes microprocessor control ware 1, proportion variable pump variable mechanism 2, variable plunger pump body 3, pump driving motor 4, pump oil unit 6, microprocessor control ware 1 passes through proportion variable pump variable mechanism 2 with variable plunger pump body 3 is connected, microprocessor control ware 1 passes through pump driving motor 4 with variable plunger pump body 3 is connected, the installation is equipped with pump pivot angle sensor 5 on the variable plunger pump body 3, pump pivot angle sensor 5 with microprocessor control ware 1 electric connection, variable plunger pump body 3 includes that first pump oil is imported and exported 34, 35 is imported and exported to second pump oil, variable plunger pump body 3 passes through respectively 34 are imported and exported to first pump oil, 35 is imported and exported to second pump oil with pump control unit 6 communicates.

In a preferred embodiment, the variable mechanism 2 of the proportional variable pump includes a valve body 21, a coupler 22, a mounting plate 23, and a digital driving motor 24 electrically connected to the microprocessor controller 1, wherein the valve body 21 is cylindrical, one end of the valve body 21 is provided with a first groove 211, the other end of the valve body 21 is provided with a second groove 213, a central through hole 212 communicating the first groove 211 with the second groove 213 is axially arranged inside the valve body 21, one end of the valve body 21 provided with the first groove 211 is fixedly connected to the mounting plate 23, the center of the mounting plate 23 is provided with a first through hole 231 axially penetrating, the digital driving motor 24 is fixedly connected to the mounting plate 23, an output end of the digital driving motor 24 penetrates through the first through hole 231 and extends into the first groove 211, a valve core 25 is arranged inside the valve body 21, one end of the valve core 25 is connected with the output end of the digital driving motor 24 in the first groove 211 through the coupler 22, the other end of the valve core 25 penetrates through the central through hole 212 and extends into the second groove 213, a plunger 26 is axially sleeved in the second groove 213, and a third groove 2611 sleeved with one end of the valve core 25 in the second groove 213 is arranged at one end of the plunger 26.

In a preferred embodiment, the spool 25 is splined to the coupler 22.

In a preferred embodiment, the plunger 26 includes two coaxial segments of a first plunger body 261 and a second plunger body 262 with unequal outer diameters, the outer diameter of the first plunger body 261 is larger than that of the second plunger body 262, the first plunger body 261 is sleeved with the inner side wall of the second groove 213, the third groove 2611 is arranged on the first plunger body 261, the second plunger body 262 and the first plunger body 261 are of an integral structure, and an oil chamber 2621 is arranged at the opposite end of the connecting end of the second plunger body 262 and the first plunger body 261.

In a preferred embodiment, a first oil hole 2612 communicating with an inner side wall of the third groove 2611 is provided on an end surface of the first plunger body 261 at one end provided with the third groove 2611, a plunger oil inlet 2613 and a plunger oil return hole 2614 penetrating the third groove 2611 are radially provided on a side wall of the first plunger body 261 at one end provided with the third groove 2611, a valve body oil inlet 214 corresponding to the plunger oil inlet 2613 and a valve body oil return hole 215 corresponding to the plunger oil return hole 2614 are radially provided on an outer side wall of the valve body 21, and an annular groove 251 is provided on a side wall of one end of the valve core 25 sleeved with the plunger 26.

In a preferred embodiment, the variable mechanism 2 of the proportional variable pump further includes a high-pressure oil pipe P1 and an oil return pipe T1, the high-pressure oil pipe P1 is connected to the valve body oil inlet 214 and the oil cavity 2621, respectively, and the oil return pipe T1 is connected to the valve body oil return hole 215.

In a preferred embodiment, the outer side wall of the valve core 25 is provided with a screw nut 27 in a threaded connection, and the outer side wall of the screw nut 27 is fixedly connected with the inner side wall of the central through hole 212.

In a preferred embodiment, the variable displacement plunger pump body 3 is a swash plate type variable displacement plunger pump, the variable displacement plunger pump body 3 includes a swash plate 31, two ends of the swash plate 31 are respectively connected with a pump plunger 32, a pump swash plate rotating shaft 33 is arranged at the center of the swash plate 31, one end of the swash plate 31 is movably connected with the second plunger body 262, and the reciprocating motion of the second plunger body 262 drives the swash plate 31 to rotate around the pump swash plate rotating shaft 33 so as to change the displacement of the variable displacement plunger pump body 3.

In a preferred embodiment, the pump control unit 6 includes an oil cylinder 61, a first liquid filling check valve 62, and a second liquid filling check valve 63, one end of the oil cylinder 61 is communicated with the first pump oil inlet/outlet 34 through the first liquid filling check valve 62, the other end of the oil cylinder 61 is communicated with the second pump oil inlet/outlet 35 through the second liquid filling check valve 63, an oil cylinder displacement sensor 64 is disposed on the oil cylinder 61, and the oil cylinder displacement sensor 64 is electrically connected to the microprocessor controller 1.

In a preferred embodiment, the pump control unit 6 includes a motor 65, a third liquid-filling check valve 66, and a fourth liquid-filling check valve 67, one end of the motor 65 is communicated with the first pump oil inlet/outlet 34 through the third liquid-filling check valve 66, the other end of the cylinder 65 is communicated with the second pump oil inlet/outlet 35 through the fourth liquid-filling check valve 67, the motor 65 is provided with a motor rotation angle sensor 68, and the motor rotation angle sensor 68 is electrically connected to the microprocessor controller 1.

The invention has the beneficial effects that:

the invention sends a control signal to a digital driving motor through a microprocessor controller, and can control the swash plate swing angle of a variable plunger pump body by controlling a variable mechanism of a proportional variable pump, wherein when the swash plate swing angle theta is 0 degree, the output flow of the pump is 0; when the swing angle is larger than 0 degree, the flow is in direct proportion to tan theta, and the pump flow direction is from the first pump oil inlet and outlet to the second pump oil inlet and outlet; when the swing angle is smaller than 0 degree, the flow is in direct proportion to tan theta, the pump flow direction is from the second pump oil inlet and outlet to the first pump oil inlet and outlet, the one-way and two-way flow control of the variable plunger pump body can be realized, the precision control of the swing angle is realized, the precision control of the speed and the position of the oil cylinder or the speed and the rotation angle of the motor can be further realized, meanwhile, the response is fast, the control precision and the frequency response requirements of the traditional servo valve control oil cylinder or motor can be met, and compared with the traditional servo valve control oil cylinder or motor, the servo valve control oil cylinder or motor is high in efficiency and energy saving, strong in pollution resistance.

Drawings

The invention is explained in further detail below with reference to the drawing.

FIG. 1 is a schematic structural diagram of a cylinder pump control system of a digital control proportional plunger variable displacement pump and a pump control system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a variable mechanism of a digitally controlled proportional piston variable pump and a pump control system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a motor pump control system of a digitally controlled proportional plunger variable displacement pump and a pump control system according to an embodiment of the present invention.

In the figure:

1. a microprocessor controller; 2. a variable mechanism of the proportional variable pump; 21. a valve body; 211. a first groove; 212. a central through hole; 213. a second groove; 214. a valve body oil inlet hole; 215. an oil return hole of the valve body; 22. a coupling; 23. mounting a plate; 24. a digital drive motor; 25. a valve core; 251. an annular groove; 26. a plunger; 261. a first plunger body; 2611. a third groove; 2612. a first oil hole; 2613. a plunger oil inlet hole; 2614. a plunger oil return hole; 262. a second plunger body; 2621. an oil chamber; 27. a lead screw nut; 3. a variable displacement plunger pump body; 31. a swash plate; 32. a pump plunger; 33. a pump swash plate rotating shaft; 34. a first pump oil inlet and outlet; 35. a second pump oil inlet and outlet; 4. a pump drive motor; 5. a pump swing angle sensor; 6. a pump control unit; 61. an oil cylinder; 62. a first liquid-filled check valve; 63. a second liquid-filled check valve; 64. a cylinder displacement sensor; 65. a motor; 66. a third liquid-filled check valve; 67. a fourth liquid-filled check valve; 68. a motor rotation angle sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The invention will be further described with reference to the drawings and specific examples.