Inner curve radial plunger motor and control method thereof

Abstract

The invention belongs to the technical field of motors, and particularly relates to an inner curve radial plunger motor and a control method thereof.The motor comprises a front end cover, a cylinder body, an electric slip ring outer ring, an electric slip ring inner ring, a rear end cover and a rotor, the front end cover is provided with a flow distribution channel, radial plungers and electromagnetic coils are evenly arranged in the circumferential direction of the rotor, and the radial plungers are driven after oil passes through a motor oil way; an inner curve is arranged on the cylinder body, a pressure switch is arranged on a radial plunger opening and used for controlling the coil to be powered on and powered off and forming a uniform magnetic field, when the radial plunger is ejected out, magnetic induction lines can be cut, magnetic induction force is generated, when oil pressure is insufficient, the radial plunger can be assisted to be ejected out, and when the pressure switch detects that the pressure of an oil return opening is small, the coil is controlled to be powered off. And the radial plunger is pressed back by a curve in the cylinder body, so that the oil absorption and oil return processes of the motor are realized. The motor is assisted to work by controlling the electromagnetic coil to be powered on and powered off, intermediate transmission links are reduced, and the device has the advantages of being high in efficiency and easy to control and maintain.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to an inner-curve radial piston motor and a control method thereof. Background Art

[0002] The inner curve radial piston motor is an actuator of the hydraulic system, which can convert the pressure energy of the liquid into the mechanical energy of the working shaft to achieve energy conversion output. The inner curve radial piston motor is suitable for multi-purpose low-speed and high-torque working occasions. It has the characteristics of small size, light weight, high starting efficiency and stable operation at low speed.

[0003] At present, the problems with the inner-curve radial piston motor are: when the motor works under harsh working conditions and the cylindrical roller deflects, the reaction force transmitted to the plastic block is extremely large, which will cause the elastic pin in the rotor assembly to break, causing the hydraulic motor to fail. Since the output torque of the inner-curve radial piston hydraulic motor is insufficient, it will be unable to drive the load to rotate. When the working oil pressure is too low, the rotor output power decreases, the motor's working efficiency is significantly reduced, the starting and acceleration performance deteriorates, the output torque is unstable, and the internal wear rate is accelerated, which seriously affects the performance stability and service life of the hydraulic motor. Summary of the invention

[0004] In view of the above situation, the present invention provides an inner curve radial piston motor and a control method thereof, which removes the coupling, reduces the connection and matching, and adds an electric slip ring, an electromagnetic coil and a pressure switch on the original basis, and cooperates with the hydraulic components to realize the auxiliary radial piston ejection and retraction action. It has the characteristics of high efficiency, easy control and maintenance, and at the same time, improves the energy conversion efficiency and reliability, has a large output torque, and is simple to operate and control.

[0005] The technical solution adopted by the present invention is to provide an inner curve radial piston motor, which includes a front end cover, a cylinder body, an electric slip ring outer ring, an electric slip ring inner ring, a rear end cover and a rotor. The front end cover is arranged at the first end of the cylinder body, the rear end cover is arranged at the second end of the cylinder body, the rotor is installed on the rotor support shaft of the front end cover, a front end cover sealing ring is arranged between the front end cover and the cylinder body, a rear end cover sealing ring is arranged between the rear end cover and the cylinder body, a skeleton oil seal is arranged between the rotor and the rear end cover, and an inner curve groove is designed on the inner circumferential surface of the cylinder body.

[0006] The front end cover includes an end cover surface and a rotor support shaft. The rotor support shaft is arranged in the center of the first side of the end cover surface. The end cover surface is installed at the first end of the cylinder body. A central oil hole and a plate shuttle valve are arranged on the rotor support shaft. The central oil hole is arranged in the central position of the rotor support shaft. A plate shuttle valve is installed at the second end of the central oil hole. The plate shuttle valve can be switched between the oil inlet pipe joint and the oil outlet pipe joint.

[0007] A flow distribution channel, an oil inlet pipe joint and an oil outlet pipe joint are arranged on the end cover surface. The flow distribution channel is evenly arranged in the central position of the end cover surface along the circumferential direction. The first end of the flow distribution channel is provided with an oil inlet pipe joint, and the second end of the flow distribution channel is provided with an oil outlet pipe joint.

[0008] The rotor is provided with an electromagnetic coil, a radial plunger, a radial plunger mounting hole, an insulating frame, a pressure detection oil hole and a pressure switch. The radial plunger mounting holes are evenly arranged at the second end of the rotor in the circumferential direction. The first end of the radial plunger mounting hole is installed with an insulating frame. The radial plunger passes through the insulating frame and is installed in the radial plunger mounting hole. The insulating frame is wound with an electromagnetic coil. The rotor is provided with a pressure detection oil hole in the axial direction. The pressure detection oil hole is communicated with the radial plunger mounting hole. The pressure switch is installed in the pressure detection oil hole. The second end of the radial plunger is provided with a plunger sealing ring. The rotor is provided with an electric slip ring inner ring, an electric slip ring outer ring is installed on the electric slip ring inner ring, a slip ring internal terminal is provided at the first end of the electric slip ring inner ring, and a rear end cover is provided with a rear end cover outlet and a rear end cover inlet.

[0009] Preferably, a slide groove and an oil hole are provided on the rotor support shaft, the slide groove is arranged along the circumference of the rotor support shaft, and the oil hole is arranged at the bottom of the slide groove.

[0010] Preferably, a circular hole is provided in the central portion of the insulating frame, and the cross section of the insulating frame is arranged in an I-shaped structure.

[0011] Preferably, a coil baffle is provided at the second end of the electromagnetic coil.

[0012] Further, preferably, the rotor is configured to be cylindrical, the first end of the rotor is mounted in cooperation with the end cover surface, and the second end of the rotor is provided with a mounting groove for mounting in cooperation with the working machine.

[0013] Preferably, the edges of the inner curved groove are designed with rounded corners.

[0014] Preferably, the radial piston is made of tungsten carbide material, one end of the radial piston is designed to be streamlined, the surface is coated, a steel ball is installed on the radial piston, the steel ball is tightly pressed against the inner circumferential surface of the cylinder body, and the inner curved groove interacts with the radial piston to form a working chamber.

[0015] Preferably, a bolt mounting hole is provided on the rear end cover, and the rear end cover is connected to the cylinder body by bolts.

[0016] Preferably, the control method of the inner curve radial piston motor provided by the present invention comprises the following steps:

[0017] S1: Connect the mechanical rotating shaft and the rotor through a key;

[0018] S2: Connect the inner ring of the electric slip ring to the rotor through a key;

[0019] S3: The inner ring of the electric slip ring is energized, and the power is connected from the inlet of the rear cover, transmitted to the mechanical shaft through the inner ring of the electric slip ring, and then flows out from the outlet of the rear cover;

[0020] S4: Connect the motor oil circuit, the oil flows in from the oil inlet pipe joint, flows into the distribution channel through the plate shuttle valve, flows evenly to each central oil hole through the distribution channel, reaches the radial piston at the rotor, pushes the radial piston out, the plate shuttle valve moves, and switches the oil inlet and outlet of the hydraulic motor;

[0021] S5: A steel ball is installed on the radial piston. After the radial piston is pushed out by the oil, the steel ball contacts the inner curved groove provided on the circumferential surface of the cylinder body. The steel ball presses against the inner circumferential surface of the cylinder body, and the radial piston is pushed back into the radial piston installation hole by the inner curved groove, thereby retracting the radial piston.

[0022] S6: The pressure switch realizes the start and stop control of the circuit according to the pressure change in the system, ensuring the safe operation of the equipment within the preset pressure range. When insufficient oil pressure is detected, the electromagnetic coil will be controlled to be energized to generate an electromagnetic field. When the radial piston moves, it will cut the magnetic induction line and generate magnetic induction force to assist the radial piston movement.

[0023] S7: When the working oil pressure is too low, the rotor output power decreases, and the hydraulic motor implements step S6 under the dual effects of electromagnetic force and oil pressure to increase the output torque.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The present invention removes the coupling, reduces the connections and fits, improves the energy conversion efficiency and reliability, and has the characteristics of easy installation, simple operation and control, and large output torque.

[0026] 2. The oil distribution device in the present invention acts as a stator structure to drive the rotor to move, so that the hydraulic motor rotates by relying on the hydraulic pressure. By controlling the current change of the electromagnetic coil, the radial piston extension and retraction control is realized, which reduces the intermediate transmission links, improves work efficiency, and has the characteristics of high efficiency, easy control and maintenance.

[0027] 3. The present invention does not require a separate motor to provide torque and has the characteristics of small size and easy installation.

[0028] 4. The rear end cover of the present invention is provided with an inlet and an outlet, and the electromagnetic coil is connected to the outlet through an electric slip ring and a pressure switch, thereby realizing the power gain and loss control of the electromagnetic coil.

[0029] 5. When the hydraulic motor of the present invention is working, the steel ball on the radial piston moves along the multi-action inner curve slide rail, converting the sliding friction into rolling friction, reducing the friction force and increasing the working life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional view of the structure of the present invention as a whole;

[0031] Figure 2 This is a schematic diagram of the front end cover structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the rear end cover structure of the present invention;

[0033] Figure 4 This is a diagram of the internal device of the present invention;

[0034] Figure 5 It is a cross-sectional view of the rotor structure of the present invention;

[0035] Figure 6 This is a diagram showing the internal electromagnetic coil and plunger distribution of the present invention;

[0036] Figure 7 It is a structural explosion diagram of the present invention;

[0037] Figure 8 is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0038] In order to fully describe the technical content, structural features, objectives and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.

[0039] The present invention provides an inner curve radial piston motor, such as Figure 1 to Figure 7 As shown, it includes a front end cover 1, a cylinder body 4, an electric slip ring outer ring 5, an electric slip ring inner ring 6, a rear end cover 8 and a rotor 10. The front end cover 1 is arranged at the first end of the cylinder body 4, the rear end cover 8 is arranged at the second end of the cylinder body 4, and the rotor 10 is installed on the rotor support shaft 26 of the front end cover 1. A front end cover sealing ring 15 is arranged between the front end cover 1 and the cylinder body 4, a rear end cover sealing ring 7 is arranged between the rear end cover 8 and the cylinder body 4, a skeleton oil seal 23 is arranged between the rotor 10 and the rear end cover 8, and an inner curved groove 22 is designed on the inner circumferential surface of the cylinder body 4.

[0040] The front end cover 1 includes an end cover surface 31 and a rotor support shaft 26. The rotor support shaft 26 is arranged at the center of the first side of the end cover surface 31. The end cover surface 31 is installed at the first end of the cylinder body 4. A central oil hole 24 and a plate shuttle valve 25 are arranged on the rotor support shaft 26. The central oil hole 24 is arranged at the central position of the rotor support shaft 26. The second end of the central oil hole 24 is installed with a plate shuttle valve 25. The plate shuttle valve 25 can switch between the oil inlet 161 and the oil outlet 171.

[0041] The end cover surface 31 is provided with a distribution channel 18, an oil inlet pipe joint 16 and an oil outlet pipe joint 17. The distribution channel 18 is evenly arranged at the central position of the end cover surface 31 along the circumferential direction. The first end of the distribution channel 18 is provided with the oil inlet pipe joint 16, and the second end of the distribution channel 18 is provided with the oil outlet pipe joint 17.

[0042] The rotor 10 is provided with an electromagnetic coil 2, a radial piston 3, a radial piston mounting hole 29, an insulating frame 30, a pressure detection oil hole 32 and a pressure switch 12. The radial piston mounting hole 29 is evenly arranged at the second end of the rotor 10 along the circumferential direction. The first end of the radial piston mounting hole 29 is provided with an insulating frame 30. The radial piston 3 passes through the insulating frame 30 and is installed in the radial piston mounting hole 29. The electromagnetic coil 2 is wound on the insulating frame 30. The rotor 10 is provided with a pressure detection oil hole 32 along the axial direction. The pressure detection oil hole 32 communicates with the radial piston mounting hole 29. The pressure switch 12 is installed in the pressure detection oil hole 32. The second end of the radial piston 3 is provided with a plunger sealing ring 13. The rotor 10 is provided with an electric slip ring inner ring 6, on which an electric slip ring outer ring 5 is installed. The first end of the electric slip ring inner ring 6 is provided with a slip ring internal terminal 9. The rear end cover 8 is provided with a rear end cover outlet 21 and a rear end cover inlet 20.

[0043] The rotor support shaft 26 is provided with a slide groove 27 and an oil hole 28. The slide groove 27 is arranged along the circumference of the rotor support shaft 26. The oil hole 28 is arranged at the bottom of the slide groove 27. A circular hole is arranged at the central part of the insulating frame 30. The cross section of the insulating frame 30 is arranged in an I-shaped structure. A coil baffle 14 is arranged at the second end of the electromagnetic coil 2 to prevent the electromagnetic coil from falling off.

[0044] The rotor 10 is set to be cylindrical, the first end of the rotor 10 is mounted with the end cover surface 31, and the second end of the rotor 10 is provided with a mounting groove 34 for mounting with a working machine. The edge of the inner curved groove 22 is rounded to reduce stress concentration and improve sealing performance.

[0045] The radial piston 3 is made of wear-resistant tungsten carbide material to improve wear resistance. The head of the radial piston 3 adopts a streamlined design, and the surface is treated with a coating to reduce surface roughness, reduce fluid resistance, reduce dynamic pressure loss of the fluid during movement, and improve efficiency. A steel ball 33 is installed on the radial piston 3, and the steel ball 33 is tightly pressed against the inner circumferential surface of the cylinder body 4. The inner curved groove 22 interacts with the radial piston 3 to form a working chamber. The rear end cover 8 is provided with a bolt mounting hole 19, and the rear end cover 8 is connected to the cylinder body 4 by bolts 11.

[0046] In addition, if Figure 8 As shown, the control method of the inner curve radial piston motor provided by the present invention comprises the following steps:

[0047] S1: Connect the mechanical rotating shaft and the rotor 10 via a key.

[0048] S2: Connect the inner ring 6 of the electric slip ring to the rotor 10 via a key.

[0049] S3: The electric slip ring inner ring 6 is energized, and the power is connected from the line inlet 20 of the rear cover, transmitted to the mechanical shaft through the electric slip ring inner ring 6, and then flows out from the line outlet 21 of the rear cover.

[0050] S4: The motor oil circuit is connected, and the oil flows in from the oil inlet pipe joint 16, flows into the distribution channel 18 through the plate shuttle valve 25, and flows evenly to each central oil hole 24 through the distribution channel 18, reaches the radial piston 3 at the rotor 10, pushes the radial piston 3 out, and the plate shuttle valve 25 moves, switching the hydraulic motor oil inlet 161 and the oil outlet 171.

[0051] S5: A steel ball 33 is installed on the radial piston 3. After the radial piston 3 is pushed out by the oil, the steel ball 33 contacts the inner curved groove 22 set on the inner circumferential surface of the cylinder body 4. The steel ball 33 presses tightly against the inner circumferential surface of the cylinder body 4, and relies on the inner curved groove 22 to push the radial piston 3 back into the radial piston mounting hole 29, thereby retracting the radial piston 3.

[0052] S6: The pressure switch 12 realizes the start and stop control of the circuit according to the pressure change in the system to ensure the safe operation of the equipment within the preset pressure range. When insufficient oil pressure is detected, the electromagnetic coil 2 will be controlled to be energized to generate an electromagnetic field. When the radial piston 3 moves, it will cut the magnetic induction line and generate a magnetic induction force to assist the movement of the radial piston 3.

[0053] S7: When the working oil pressure is too low, the output power of the rotor 10 decreases. Under the dual effects of electromagnetic force and oil pressure, the hydraulic motor implements step S6 to increase the output torque.

[0054] Specifically, the front end cover 1 of the inner curve radial piston motor of the present invention is provided with a distribution channel 18. After the motor oil circuit is passed through the oil, the radial piston 3 is driven to drive the rotor 10 to rotate. The cylinder body 4 is provided with a regular multi-action inner curve 22. The radial piston 3 and the multi-action inner curve 22 of the cylinder body 4 are in contact to realize the oil suction and oil return process of the motor. The inner curve radial piston motor of the present invention is provided with an electric slip ring inner ring 6 and an electric slip ring inner ring 5 to realize that the electromagnetic coil 2 follows the rotation of the rotor 10. Each radial piston 3 is installed with a pressure switch 12 to detect the pressure of each oil port, so as to control the power gain and loss of the electromagnetic coil 2. The power is led from the electric slip outer ring 5 and the electric slip inner ring 6 to the pressure switch 12, and then from the pressure switch 12 to the electromagnetic coil 2. The electric slip ring inner ring 6 realizes the transmission of electrical signals between the rotor 10 and the mechanical shaft, so that the hydraulic motor rotor 10 has a larger range of motion and a more complex motion mode, and can avoid the cable from being entangled during rotation, resulting in damage and wear. The electromagnetic coil 2 is connected to three-phase alternating current, and the phase difference between the three phases is 120°. The circular uniform magnetic field generated by the three-phase alternating current will cut the magnetic flux lines when the radial piston 3 is ejected, generating magnetic induction force, which can assist the radial piston 3 to be ejected when the oil pressure is insufficient. When the pressure switch 12 detects that the pressure at the return oil port is low, the electromagnetic coil 2 is controlled to lose power, and the radial piston 3 is pressed back by the multi-action inner curve 22 of the cylinder body 4 to complete the oil suction and discharge actions. When the working oil pressure is too low, the output power of the rotor 10 is reduced, the motor working efficiency is significantly reduced, the output torque is unstable, and the performance stability and service life of the hydraulic motor are seriously affected. Under the dual effects of electromagnetic force and oil pressure, this hydraulic motor will increase the output torque and solve the above series of problems.

[0055] The above is a preferred implementation of the present application, which does not limit the scope of protection of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of this technology, and these improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An inner curve radial piston motor, characterized in that: It includes a front cover, a cylinder body, an outer ring of an electric slip ring, an inner ring of an electric slip ring, a rear cover and a rotor. The front end cover is arranged at the first end of the cylinder body, the rear end cover is arranged at the second end of the cylinder body, the rotor is mounted on the rotor support shaft of the front end cover, a front end cover sealing ring is arranged between the front end cover and the cylinder body, a rear end cover sealing ring is arranged between the rear end cover and the cylinder body, a skeleton oil seal is arranged between the rotor and the rear end cover, and an inner curved groove is designed on the inner circumferential surface of the cylinder body; The front end cover comprises an end cover surface and a rotor support shaft, the rotor support shaft is arranged at the center of a first side of the end cover surface, the end cover surface is installed at a first end of the cylinder body, a central oil hole and a plate-type shuttle valve are arranged on the rotor support shaft, the central oil hole is arranged at a central position of the rotor support shaft, a plate-type shuttle valve is installed at a second end of the central oil hole, and the plate-type shuttle valve can be switched between an oil inlet pipe joint and an oil outlet pipe joint; The end cover surface is provided with a flow distribution channel, an oil inlet pipe joint and an oil outlet pipe joint, the flow distribution channel is evenly arranged at the central position of the end cover surface along the circumferential direction, the first end of the flow distribution channel is provided with an oil inlet pipe joint, and the second end of the flow distribution channel is provided with an oil outlet pipe joint; The rotor is provided with an electromagnetic coil, a radial plunger, a radial plunger mounting hole, an insulating frame, a pressure detection oil hole and a pressure switch. The radial plunger mounting holes are evenly arranged at the second end of the rotor in the circumferential direction. The first end of the radial plunger mounting hole is installed with an insulating frame. The radial plunger passes through the insulating frame and is installed in the radial plunger mounting hole. The electromagnetic coil is wound on the insulating frame. The rotor is axially provided with a pressure detection oil hole. The pressure detection oil hole is communicated with the radial plunger mounting hole. The pressure switch is installed in the pressure detection oil hole. The second end of the radial plunger is installed with a plunger sealing ring. The rotor is equipped with an electric slip ring inner ring, an electric slip ring outer ring is installed on the electric slip ring inner ring, a slip ring internal terminal is arranged at the first end of the electric slip ring inner ring, and a rear end cover is provided with a rear end cover outlet and a rear end cover inlet.

2. The inner curve radial piston motor according to claim 1, characterized in that: A slide groove and an oil hole are arranged on the rotor support shaft. The slide groove is arranged along the circumference of the rotor support shaft, and the oil hole is arranged at the bottom of the slide groove.

3. The inner curve radial piston motor according to claim 1, characterized in that: A circular hole is arranged at the central part of the insulating frame, and the cross section of the insulating frame is arranged in an I-shaped structure.

4. The inner curve radial piston motor according to claim 1, characterized in that: The second end of the electromagnetic coil is provided with a coil baffle.

5. The inner curve radial piston motor according to claim 1, characterized in that: The rotor is configured to be cylindrical, the first end of the rotor is mounted in cooperation with the end cover surface, and the second end of the rotor is provided with a mounting groove for mounting in cooperation with the working machine.

6. The inner curve radial piston motor according to claim 1, characterized in that: The edges of the inner curve groove are rounded.

7. The inner curve radial piston motor according to claim 1, characterized in that: The radial piston is made of tungsten carbide material. One end of the radial piston is designed to be streamlined and the surface is coated. A steel ball is installed on the radial piston. The steel ball presses tightly against the inner circumference of the cylinder body. The inner curved groove interacts with the radial piston to form a working chamber.

8. The inner curve radial piston motor according to claim 1, characterized in that: The rear end cover is provided with bolt mounting holes, and the rear end cover is connected to the cylinder body by bolts.

9. A control method using the inner curve radial piston motor according to any one of claims 1 to 8, characterized in that: It includes the following steps: S1: Connect the mechanical rotating shaft and the rotor through a key; S2: Connect the inner ring of the electric slip ring to the rotor through a key; S3: The inner ring of the electric slip ring is energized, and the power is connected from the inlet of the rear cover, transmitted to the mechanical shaft through the inner ring of the electric slip ring, and then flows out from the outlet of the rear cover; S4: Connect the motor oil circuit, the oil flows in from the oil inlet pipe joint, flows into the distribution channel through the plate shuttle valve, flows evenly to each central oil hole through the distribution channel, reaches the radial piston at the rotor, pushes the radial piston out, the plate shuttle valve moves, and switches the oil inlet and outlet of the hydraulic motor; S5: A steel ball is installed on the radial piston. After the radial piston is pushed out by the oil, the steel ball contacts the multi-action inner curve set on the circumferential surface of the cylinder body. The steel ball presses against the inner circumferential surface of the cylinder body, and the radial piston is pushed back into the radial piston installation hole by the multi-action inner curve, thereby retracting the radial piston. S6: The pressure switch realizes the start and stop control of the circuit according to the pressure change in the system, ensuring the safe operation of the equipment within the preset pressure range. When insufficient oil pressure is detected, the electromagnetic coil will be controlled to be energized to generate an electromagnetic field. When the radial piston moves, it will cut the magnetic induction line and generate magnetic induction force to assist the radial piston movement. S7: When the working oil pressure is too low, the rotor output power decreases, and the hydraulic motor implements step S6 under the dual effects of electromagnetic force and oil pressure to increase the output torque.

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