CN110761964B - Digital control proportional plunger variable pump and pump control system - Google Patents
Digital control proportional plunger variable pump and pump control system Download PDFInfo
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- CN110761964B CN110761964B CN201911103980.7A CN201911103980A CN110761964B CN 110761964 B CN110761964 B CN 110761964B CN 201911103980 A CN201911103980 A CN 201911103980A CN 110761964 B CN110761964 B CN 110761964B
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- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 27
- 238000006073 displacement reaction Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 9
- 230000008878 coupling Effects 0.000 description 11
- 238000010168 coupling process Methods 0.000 description 11
- 238000005859 coupling reaction Methods 0.000 description 11
- 230000004044 response Effects 0.000 description 11
- 238000004891 communication Methods 0.000 description 6
- 230000008676 import Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/28—Control of machines or pumps with stationary cylinders
- F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Reciprocating Pumps (AREA)
Abstract
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 micro-processing controller, a proportional variable pump variable mechanism, a variable plunger pump body, a pump driving motor and a pump control unit.
Description
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
Along with the development of automation, informatization and energy conservation in industry, more and more hydraulic control systems adopt pump control servo systems, the pump control systems have no throttling loss compared with valve control systems, the energy conservation effect is excellent, the core element of the pump control systems is a proportional variable pump, and the quality of the pump control systems directly determines the control precision, the rapidity, the stability, the reliability and the energy conservation 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, such as Lishile company, is formed by the electronic variable plunger pump and a common motor. Another pump control system on the market consists of a constant displacement pump with a gear engaged with a high-power servo motor, such as the ford company.
The conventional proportional variable plunger pump variable structure consisting of proportional valves or servo valves in the market at present is a valve-controlled oil cylinder system, the quality of the control quality of the valve-controlled oil cylinder system is determined by the quality of the proportional valves or the servo valves and the control quality of a controller, and the dynamic quality of the proportional valves is poor due to the fact that dead zones are large, so that the high-frequency response high-precision control quality requirement cannot be met; the high-frequency response proportional servo valve and the servo valve have high control precision and high frequency response, are used for controlling the variable structure of the variable pump to meet the requirements, but have high requirements on the cleanliness of oil, poor reliability, complex control algorithm parameters, poor self-adaptability, high requirements on users, frequent occurrence of nozzle blockage, nozzle corrosion and valve core jam faults, and high price, and the pump control system can be formed by adopting the constant-rotation-speed motor to drive the proportional variable pump.
Another pump control system in the market, which consists of a constant displacement pump and a servo motor, has been widely used in speed control situations (corresponding to open loop control situations) where the control quality is low and energy saving is required. Because the volumetric efficiency of the pump is low at low rotation speed, but the dynamic response of the servo motor is low, and the quantitative pump is mostly a one-way pump, a valve control loop formed by matching with a reversing valve is required to form a pump control system, the accurate and rapid position control of the actuating mechanism cannot be realized, and the pump cannot be in a low rotation speed working condition for a long time.
Because of the defects of the two pump control systems, how to provide a variable pump and a pump control system which are integrated with a digital controller, high accuracy, quick response, good stability and strong pollution resistance is a technical problem which needs to be solved in the field.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a digital control proportional plunger variable pump and a pump control system.
The invention aims at realizing the following technical scheme: the utility model provides a digital control proportion plunger variable pump and pump control system, includes microprocessor controller 1, proportion variable pump variable mechanism 2, variable plunger pump body 3, pump driving motor 4, pump oil unit 6, microprocessor controller 1 pass through proportion variable pump variable mechanism 2 with variable plunger pump body 3 is connected, microprocessor controller 1 pass through pump driving motor 4 with variable plunger pump body 3 is connected, install on the variable plunger pump body 3 and be equipped with pump pivot angle sensor 5, pump pivot angle sensor 5 with microprocessor controller 1 electric connection, variable plunger pump body 3 includes first pump oil import and export 34, second pump oil import and export 35, variable plunger pump body 3 respectively through first pump oil import and export 34, second pump oil import and export 35 with pump control unit 6 communicates.
In a preferred embodiment, the variable pump variable mechanism 2 comprises a valve body 21, a coupling 22, a mounting plate 23, and a digital driving motor 24 electrically connected with the micro-processing controller 1, 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 interior of the valve body 21 is axially provided with a central through hole 212 for communicating the first groove 211 with the second groove 213, one end of the valve body 21 provided with the first groove 211 is fixedly connected with the mounting plate 23, the center of the mounting plate 23 is provided with a first through hole 231 penetrating axially, the digital driving motor 24 is fixedly connected with the mounting plate 23, the output end of the digital driving motor 24 penetrates through the first through hole 231 and stretches into the first groove 211, the interior of the valve body 21 is provided with a valve core 25, one end of the valve core 25 and the output end of the digital driving motor 24 are axially connected in the first groove 211 through the coupling 22, the other end of the valve core 25 penetrates through the central through hole 212 and stretches into the second groove 213, and the valve core 25 is sleeved with the first end of the valve core 213 and is sleeved with the second end of the plunger 2611.
In a preferred embodiment, the spool 25 is splined to the coupling 22.
In a preferred embodiment, the plunger 26 includes two sections of coaxial first and second plunger bodies 261, 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 disposed on the first plunger body 261, the second plunger body 262 and the first plunger body 261 are in an integral structure, and an oil cavity 2621 is disposed at the opposite end of the connecting end of the second plunger body 262 and the first plunger body 261.
In a preferred embodiment, the end surface of the first plunger body 261, which is provided with one end of the third groove 2611, is provided with a first oil hole 2612 which is communicated with the inner side wall of the third groove 2611, the side wall of the first plunger body 261, which is provided with one end of the third groove 2611, is radially provided with a plunger oil inlet hole 2613 and a plunger oil return hole 2614 which are communicated with the third groove 2611, the outer side wall of the valve body 21 is radially provided with 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, and the side wall of one end of the valve core 25 sleeved with the plunger 26 is provided with an annular groove 251.
In a preferred embodiment, the variable displacement pump variable mechanism 2 further comprises a high-pressure oil pipe P1 and an oil return pipe T1, wherein 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.
In a preferred embodiment, 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.
In a preferred embodiment, the variable displacement pump body 3 is a swash plate type variable displacement pump, the variable displacement pump body 3 comprises a swash plate 31, pump plungers 32 are respectively connected to two ends of the swash plate 31, a pump swash plate rotating shaft 33 is arranged in the center of the swash plate 31, one end of the swash plate 31 is movably connected with the second piston body 262, and the reciprocating motion of the second piston 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 pump body 3.
In a preferred embodiment, the pump control unit 6 includes a cylinder 61, a first liquid-filling check valve 62, and a second liquid-filling check valve 63, one end of the cylinder 61 is communicated with the first pump oil inlet and outlet 34 through the first liquid-filling check valve 62, the other end of the cylinder 61 is communicated with the second pump oil inlet and outlet 35 through the second liquid-filling check valve 63, a cylinder displacement sensor 64 is disposed on the cylinder 61, and the cylinder displacement sensor 64 is electrically connected with 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 and outlet 34 through the third liquid filling check 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 check valve 67, a motor rotation angle sensor 68 is disposed on the motor 65, and the motor rotation angle sensor 68 is electrically connected with the micro-processing controller 1.
The beneficial effects of the invention are as follows:
according to the invention, a microprocessor controller sends a control signal to a digital driving motor, the swashplate swing angle of a variable plunger pump body can be controlled by controlling a variable mechanism of a proportional variable pump, and the output flow of the pump is 0 when the swashplate swing angle theta is 0 degree; when the swing angle is larger than 0 degree, the flow is proportional 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, unidirectional and bidirectional flow control of the variable plunger pump body can be achieved, precise control of the swing angle is achieved, further precise control of the speed and the position of the oil cylinder or the speed and the rotation angle of the motor can be achieved, meanwhile, the response is quick, 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 variable plunger pump is high in efficiency, energy-saving, high in pollution resistance and simple and stable in control.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an oil cylinder pump control system of a digitally controlled proportional plunger variable pump and pump control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a variable mechanism of a proportional variable pump of a digitally controlled proportional plunger variable pump and a pump control system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a motor pump control system of a digitally controlled proportional plunger variable pump and pump control system according to an embodiment of the present invention.
In the figure:
1. a microprocessor controller; 2. a variable mechanism of a proportional variable pump; 21. a valve body; 211. a first groove; 212. a central through hole; 213. a second groove; 214. an oil inlet hole of the valve body; 215. an oil return hole of the valve body; 22. a coupling; 23. a mounting plate; 24. a digital driving 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. plunger oil inlet hole; 2614. plunger oil return holes; 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 rotation shaft; 34. a first pump oil inlet and outlet; 35. a second pump oil inlet and outlet; 4. a pump driving motor; 5. a pump swing angle sensor; 6. a pump control unit; 61. an oil cylinder; 62. a first liquid-filled one-way valve; 63. a second liquid-filled one-way valve; 64. an oil cylinder displacement sensor; 65. a motor; 66. a third liquid-filled one-way valve; 67. a fourth liquid-filled one-way valve; 68. and a motor rotation angle sensor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The invention will be further described with reference to the drawings and specific examples.
Embodiment one:
1-2, the first embodiment of the invention provides a digital control proportional plunger variable pump and a pump control system, which comprises a micro-processing controller 1, a proportional variable pump variable mechanism 2, a variable plunger pump body 3, a pump driving motor 4 and a pump control unit 6, wherein the micro-processing controller 1 is connected with the variable plunger pump body 3 through the proportional variable pump variable mechanism 2 and is used for controlling the swashplate swing angle of the variable plunger pump body 3; the micro-processing controller 1 is connected with the variable plunger pump body 3 through a pump driving motor 4 and is used for providing power for the variable plunger pump body 3; the variable plunger pump body 3 is provided with a pump swing angle sensor 5, 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, and 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;
in the embodiment of the invention, a microprocessor controller 1 (prior art) receives a remote control signal, the control signal can be high-speed digital communication, a communication interface meeting the requirement of industry 4.0 can also receive a traditional analog signal or an on-site signal, the control signal is sent to a variable mechanism 2 of a proportional variable pump, the variable mechanism 2 of the proportional variable pump is controlled to control the swashplate swing angle of a variable plunger pump body 3 (prior art), and the flow of the variable plunger pump body 3 is in direct proportion to the swing angle; and the pump swing angle sensor 5 detects a feedback swing angle to the micro-processing controller 1, the pump swing angle sensor 5 is an angle sensor in the prior art, the micro-processing controller 1 performs closed-loop operation according to a control signal and the feedback signal and outputs a high-speed pulse signal to control the variable mechanism 2 of the proportional variable pump, and further the swash plate swing angle of the variable plunger pump body 3 is changed, so that the feedback swing angle meets the control signal requirement, and the precise and high-speed control of the displacement of the plunger pump can be realized.
In a specific embodiment, the variable displacement pump variable mechanism 2 includes a valve body 21, a coupling 22, a mounting plate 23, and a digital driving motor 24 electrically connected to the microprocessor controller 1, where 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 provided in the interior of 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, and 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 provided in the interior of the valve body 21, one end of the valve core 25 and an output end of the digital driving motor 24 are connected to the first groove 211 through the coupling 22, the other end of the valve core 25 penetrates through the central through hole 212 and extends into the second groove 213, the second groove 213 is axially sleeved with a plunger 26, one end of the plunger 26 is provided with a third groove 2611 sleeved with one end of the valve core 25 located in the second groove 213;
in a specific embodiment, the valve core 25 is connected with the coupling 22 through a spline, and when the digital driving motor 24 drives the valve core 25 to rotate through the coupling 22, the connection end of the valve core 25 and the coupling 22 can slide along the inside of the coupling 22;
the plunger 26 comprises two sections of coaxial first plunger bodies 261 and second plunger bodies 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 integrated structure, and oil cavities 2621 are formed in the opposite ends of the connecting ends of the second plunger body 262 and the first plunger body 261;
the end face of one end of the first plunger body 261, provided with the third groove 2611, is provided with a first oil hole 2612 communicated with the inner side wall of the third groove 2611, the side wall of one end of the first plunger body 261, provided with the third groove 2611, is radially provided with a plunger oil inlet hole 2613 and a plunger oil return hole 2614 communicated with the third groove 2611, the outer side wall of the valve body 21 is radially provided with 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, and the side wall of one end of the valve core 25 sleeved with the plunger 26 is provided with an annular groove 251;
the variable mechanism 2 of the proportional variable pump further comprises a high-pressure oil pipe P1 and an oil return pipe T1, wherein the high-pressure oil pipe P1 is respectively connected with the valve body oil inlet hole 214 and the oil cavity 2621, and the oil return pipe T1 is connected with the valve body oil return hole 215;
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;
the variable plunger pump body 3 is a swash plate type variable plunger pump in the prior art, the variable plunger pump body 3 comprises a swash plate 31, pump plungers 32 are respectively connected to two ends of the swash plate 31, a pump swash plate rotating shaft 33 is arranged in 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 plunger pump body 3;
in the embodiment of the present invention, as shown in fig. 2, the working principle of the variable mechanism 2 of the proportional variable pump is as follows: the digital driving motor 24 (prior art) receives a high-speed pulse driving signal, i.e., a control signal, of the micro-process controller 1, and converts the high-speed pulse driving signal into a rotation angle of the digital driving motor 24; the digital driving motor 24 is connected through the coupling 22 to drive the valve core 21 to rotate together, and the valve core 21 is in threaded connection with the lead screw nut 27, and the lead screw nut 27 is fixedly connected with the central through hole 212, so that the valve core 21 is driven by the digital driving motor 24 to move spirally to the left or right, and the movement displacement is in direct proportion to the rotation angle of the digital driving motor 24 and the lead screw lead (lead fixing);
as shown in fig. 2, the cavity between the end surface of the connecting end of the plunger 26 and the valve core 21 and the second groove 213 is set as a control cavity a cavity, when the digital driving motor 24 drives the valve core 21 to move rightward, the control cavity a cavity is communicated with the plunger oil inlet 2613 and the valve body oil inlet 214 through the first oil hole 2612 and the annular groove 251, at this time, the high-pressure oil pipe P1 is connected in the cavity a, high-pressure oil is communicated in the cavity a, while the plunger area S1 of the second plunger 262 is smaller than the plunger area S2 of the first plunger 261, and because the oil cavity 2621 and the control cavity a cavity are both communicated with the high-pressure oil pipe P1, the stress P x S2 at the left and right ends of the plunger 26 is greater than P x S1, so that the plunger 26 also moves rightward until the control cavity a and the high-pressure oil pipe P1 are disconnected, at this time, the plunger 26 stops moving; the displacement of the piston 26 to the right is the same as the displacement of the valve core 21 to the right, and is therefore proportional to the angle of rotation of the digital drive motor 24;
when the digital driving motor 24 drives the valve core 21 to move leftwards, the control cavity A is communicated with the plunger oil return hole 2614 and the valve body oil return hole 215 through the first oil hole 2612, at the moment, the control cavity A is communicated with the oil return pipe T1, the cavity A is a non-pressure cavity, so that the stress of the piston 26 at one end of the control cavity A is smaller than that of one end of the oil cavity 2621, and the piston 26 moves leftwards until the control oil cavity A is disconnected from the oil return pipe T1, and the piston 26 stops moving; the displacement of the piston 26 moving leftwards is the same as the displacement of the valve core 21 moving leftwards and is proportional to the rotation angle of the digital driving motor 24;
when the piston 26 moves leftwards or rightwards, the swash plate 31 is driven to rotate around the pump swash plate rotating shaft 33, the rotating angle is set to be theta, and when the swash plate swing angle theta is 0 degree, the output flow rate is 0 as shown in fig. 3; when the swing angle is larger than 0 degree, the flow is proportional to tan theta, and the pump flow direction is from the first pump oil inlet and outlet 34 to the second pump oil inlet and outlet 35; when the swing angle is smaller than 0 degree, the flow is in direct proportion to tan theta, and the pump flow direction is from the second pump oil inlet and outlet 35 to the first pump oil inlet and outlet 34, so in the embodiment of the invention, the variable pump variable mechanism 2 is controlled to change the swash plate angle 31 of the variable plunger pump body 3, thereby realizing unidirectional and bidirectional flow control and realizing precise control of the swing angle.
As shown in fig. 1, 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 and 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 and outlet 35 through the second liquid filling check 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;
in the embodiment of the invention, the micro-processing controller 1 receives a remote control oil cylinder control signal, the control signal can be high-speed digital communication, a communication interface meeting the requirement of industry 4.0 can also receive a traditional analog quantity signal or an on-site signal, the control of the variable mechanism 2 and the variable plunger pump body 3 of the variable pump through the comparative example is used for controlling the swashplate swing angle and direction, and the change of the swashplate swing angle theta is used for controlling the speed and direction of the oil cylinder 61; the oil cylinder displacement sensor 64 (prior art) is fed back to the micro-processing controller 1, the micro-processing controller 1 performs closed-loop operation according to the control signal and the feedback signal and outputs a high-speed pulse signal to drive the digital driving motor 24 of the variable mechanism 2 of the proportional variable pump, the digital driving motor 24 drives the plunger 26 to move to change the swashplate swing angle, meanwhile, the swashplate swing angle of the variable plunger pump 3 reaches the swing angle required by the micro-processing controller 1 through closed-loop control of the swing angle detected by the pump swing angle sensor 5 and the swing angle calculated by the micro-processing controller 1, the speed and the position of the oil cylinder 61 can be precisely controlled, and meanwhile, the response speed can reach the control precision and the frequency response requirement of the traditional servo valve control oil cylinder.
Embodiment two:
in the second embodiment of the invention, as shown in fig. 3, 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 and outlet 34 through the third liquid-filling check 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 check 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; the embodiments of the present invention are identical to those of the first embodiment except for the pump control unit 6;
in the embodiment of the invention, the microprocessor controller 1 receives a remote control motor control signal, the control signal can be high-speed digital communication, a communication interface meeting the requirement of industry 4.0 can also receive a traditional analog signal or an on-site signal, the control of the variable mechanism 2 and the variable plunger pump body 3 of the variable pump through the comparative example is realized, namely, the control of the swashplate swing angle and direction is realized, and the speed and the rotation angle of the motor 65 are controlled through the change of the swashplate swing angle theta and the change of the flow and the direction; the motor rotation angle sensor 68 (prior art) is fed back to the micro-processing controller 1, the micro-processing controller 1 performs closed-loop operation according to the control signal and the feedback signal and outputs a high-speed pulse signal to drive the digital driving motor 24 of the variable mechanism 2 of the proportional variable pump, the digital driving motor 24 drives the plunger 26 to move to change the swashplate swing angle, meanwhile, the swashplate swing angle of the variable plunger pump 3 reaches the swing angle required by the micro-processing controller 1 through closed-loop control of the swing angle detected by the pump swing angle sensor 5 and the swing angle calculated by the micro-processing controller 1, the speed and the rotation angle of the motor 65 can be precisely controlled, and meanwhile, the response speed can reach the control precision and the frequency response requirement of the traditional servo valve motor.
Finally, it should be noted that: the embodiments described above are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A digital control proportional plunger variable pump control system is characterized in that: the variable-ratio variable-displacement pump comprises a micro-processing controller (1), a variable-ratio variable-displacement pump variable mechanism (2), a variable-ratio plunger pump body (3), a pump driving motor (4) and a pump control unit (6), wherein the micro-processing controller (1) is connected with the variable-ratio plunger pump body (3) through the variable-ratio variable-displacement pump variable mechanism (2), the micro-processing controller (1) is connected with the variable-ratio plunger pump body (3) through the pump driving motor (4), a pump swing angle sensor (5) is arranged on the variable-ratio plunger pump body (3), the pump swing angle sensor (5) is electrically connected with the micro-processing controller (1), the variable-ratio plunger pump body (3) comprises a first pump oil inlet and outlet (34) and a second pump oil inlet and outlet (35), and the variable-ratio plunger pump body (3) is respectively 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);
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 inside of the valve body (21) is axially provided with a central through hole (212) which is communicated with the first groove (211) and the second groove (213), one end of the valve body (21) is provided with the first groove (211) and the mounting plate (23) is fixedly connected, the center of the mounting plate (23) is provided with a first through hole (231) which is axially penetrated, the output end of the digital driving motor (24) penetrates through the first through hole (231) and stretches into the first groove (211), the inside of the valve body (21) is provided with a central through hole (212) which the output end of the digital driving motor (25) penetrates into the first groove (213) and the other end of the valve core (22) is fixedly connected with the mounting plate (23), a plunger (26) is sleeved in the second groove (213) in an axial mode, and a third groove (2611) sleeved with one end, located in the second groove (213), of the valve core (25) is formed in one end of the plunger (26);
the valve core (25) is connected with the coupler (22) through a spline;
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 integral structure, and oil cavities (2621) are formed in the opposite ends of the connecting ends of the second plunger body (262) and the first plunger body (261).
2. The digitally controlled proportional plunger variable pump control system of claim 1 wherein: the novel valve is characterized in that the first plunger body (261) is provided with a first oil hole (2612) communicated with the inner side wall of the third groove (2611) on the end face of one end of the third groove (2611), the first plunger body (261) is provided with a plunger oil inlet hole (2613) and a plunger oil return hole (2614) communicated with the third groove (2611) on the side wall of one end of the third groove (2611), 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 arranged on 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).
3. The digitally controlled proportional plunger variable pump control system of claim 1 wherein: the variable mechanism (2) of the proportional variable pump further comprises a high-pressure oil pipe (P1) and an oil return pipe (T1), wherein the high-pressure oil pipe (P1) is respectively connected with the oil inlet hole (214) and the oil cavity (2621) of the valve body, and the oil return pipe (T1) is connected with the oil return hole (215) of the valve body.
4. The digitally controlled proportional plunger variable pump control system of claim 1 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).
5. The digitally controlled proportional plunger variable pump control system of claim 1 wherein: the variable plunger pump body (3) is a swash plate type variable plunger pump, the variable plunger pump body (3) comprises a swash plate (31), pump plungers (32) are respectively connected to two ends of the swash plate (31), 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 a second plunger body (262), and 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 plunger pump body (3).
6. The digitally controlled proportional plunger variable 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).
7. The digitally controlled proportional plunger variable 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 motor (65) is communicated with the second pump oil inlet and outlet (35) through the fourth liquid filling one-way valve (67), a motor corner sensor (68) is arranged on the motor (65), and the motor corner sensor (68) is electrically connected with the micro-processing controller (1).
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| CN201911103980.7A CN110761964B (en) | 2019-11-13 | 2019-11-13 | Digital control proportional plunger variable pump and pump control system |
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| CN211525011U (en) * | 2019-11-13 | 2020-09-18 | 北京凯德福液压技术有限公司 | Pump control system of digital control proportional plunger variable pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205918570U (en) * | 2016-08-28 | 2017-02-01 | 中航力源液压股份有限公司 | Axial plunger pump device of high accuracy electric proportional control |
| CN106593969A (en) * | 2016-11-22 | 2017-04-26 | 天津海安科技有限公司 | Electric hydraulic control mechanism |
| CN107084107A (en) * | 2017-06-22 | 2017-08-22 | 杭州力龙液压有限公司 | A kind of electronic sensor control plate variable plunger pump, hydraulic planger pump |
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