A servo motor direct-driven proportional servo valve

Abstract

The present application relates to a servo motor direct-driven proportional servo valve, and relates to the field of valve technology, which includes a valve body, and the surface of the valve body is respectively provided with a first oil outlet, a second oil outlet, an oil inlet and an oil return port, and a valve core is provided inside the valve body, and the valve core makes the oil inlet connect the first oil outlet and the second oil outlet through axial movement, and a driving motor is connected to one end of the valve body, and the output shaft of the driving motor is connected to the valve core through a transmission mechanism, and the driving motor drives the valve core to reciprocate along the axial direction through the transmission mechanism. The present application has the effects of simple structure, fast response speed, high control accuracy and low energy consumption.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a servo motor directly driven proportional servo valve. Background Art

[0002] Proportional servo valve plays a vital role in the field of industrial automation control. It can accurately control the flow and pressure of hydraulic oil, thereby achieving precise control of the movement of various actuators. Traditional proportional servo valves usually use electromagnetic force or hydraulic pilot control, which has problems such as complex structure, limited response speed, high energy consumption and control accuracy that needs to be improved. With the continuous improvement of modern industry's requirements for the performance of hydraulic control systems, the development of new high-performance proportional servo valves has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In order to solve the problems of complex structure and limited response speed of traditional proportional servo valves in the prior art, the present application provides a servo motor direct-driven proportional servo valve.

[0004] A servo motor direct-driven proportional servo valve provided in the present application adopts the following technical solution: a servo motor direct-driven proportional servo valve, comprising a valve body, a first oil outlet, a second oil outlet and an oil inlet are respectively arranged on the surface of the valve body, a valve core is arranged inside the valve body, and the valve core enables the oil inlet to connect the first oil outlet and the second oil outlet through axial movement. A driving motor is connected to one end of the valve body, and the output shaft of the driving motor is connected to the valve core through a transmission mechanism, and the driving motor drives the valve core to reciprocate axially through the transmission mechanism.

[0005] By adopting the above technical solution, the driving motor drives the valve core to move axially inside the valve body through the transmission mechanism, and the axial movement of the valve core controls the connection and disconnection of the oil inlet and the first oil outlet, and the oil inlet and the second oil outlet, as well as the cross-sectional area of ​​the connecting point, thereby controlling the connection and disconnection of the first oil outlet and the second oil outlet, as well as the flow rate.

[0006] Optionally, the transmission mechanism includes a ball screw connected to one end of the valve core, a screw nut matched with the ball screw is provided at one end of the valve body, a rotating shaft is connected to the other end of the valve core, and the drive motor is connected to the rotating shaft to drive the rotating shaft to rotate.

[0007] By adopting the above technical solution, the driving motor drives the shaft to rotate, the shaft drives the ball screw to rotate, and the valve core is driven to move axially through the cooperation of the ball screw and the screw nut, so as to adjust the axial position of the valve core. When the rotational motion of the driving motor is converted into the linear motion of the valve core through the ball screw nut pair, a large push-pull force can be generated, which can easily overcome the friction resistance and hydraulic force between the valve core and the valve sleeve.

[0008] Optionally, the drive motor is a servo motor, and one side of the drive motor is electrically connected to a photoelectric encoder.

[0009] By adopting the above technical solution, the photoelectric encoder can detect the position, speed and direction of the servo motor in real time and accurately, and feed it back to the control system. The control system accurately controls the rotation of the servo motor by comparing the difference between the actual position and the target position, ensuring that the servo motor can accurately reach the predetermined position, thereby achieving high-precision positioning control.

[0010] Optionally, the output shaft of the driving motor is connected to the rotating shaft via a sliding coupling, and the sliding coupling is fixedly connected to the output shaft of the driving motor. A connecting hole is provided in the middle of one end of the sliding coupling close to the rotating shaft, and a connecting head adapted to the connecting hole is provided at the end of the rotating shaft. The connecting head is axially movably inserted inside the connecting hole, and the connecting hole and the connecting head are both configured as polygons.

[0011] By adopting the above technical solution, since the connecting hole and the connecting head are both set to polygonal shapes, the output shaft of the driving motor can drive the rotating shaft to rotate when driving the sliding coupling. Since the connecting head is axially movably inserted into the connecting hole, the rotating shaft can move axially while ensuring the synchronous rotation of the rotating shaft and the coupling.

[0012] Optionally, a cavity is provided inside the valve body, one end of the cavity is connected to the first oil outlet, the other end is connected to the second oil outlet, the middle of the cavity is connected to the oil inlet, the valve core is provided at the connection between the first oil outlet, the second oil outlet and the cavity, and a sealing portion is formed on the valve core which protrudes outward corresponding to the connection between the first oil outlet, the second oil outlet and the cavity.

[0013] By adopting the above technical scheme, the hydraulic oil enters the cavity through the oil inlet, and then enters the first oil outlet or the second oil outlet through the connection between the cavity and the first oil outlet and the second oil outlet. When the valve core moves axially, it drives the blocking part to move. When the blocking part is located at the connection between the cavity and the oil outlet, the blocking part blocks the connection, and the connection between the oil outlet and the cavity is cut off. When the blocking part enters the cavity, the cavity and the oil outlet are connected. By changing the position of the blocking part, the cross-sectional area of ​​the connection between the cavity and the oil outlet can be adjusted, thereby changing the flow rate and realizing the regulation of the flow rate and pressure.

[0014] Optionally, a reset mechanism is provided between the driving motor and the valve body, the reset mechanism is connected to the rotating shaft, and the reset mechanism is used to drive the rotating shaft to rotate and reset to an initial position.

[0015] By adopting the above technical solution, the reset mechanism is used to drive the rotating shaft to rotate to the initial position, thereby realizing the rapid closing of the valve.

[0016] Optionally, the reset mechanism includes a shell, two ends of the shell are connected with connecting end covers, two groups of rotation reset components are centrally symmetrically arranged inside the shell, the rotating shaft passes through the shell, and the rotation reset components are sleeved on the rotating shaft.

[0017] By adopting the above technical solution, the rotary reset component is driven to rotate when the rotating shaft rotates. When resetting is required, the rotary reset component drives the rotating shaft to rotate in the opposite direction to achieve rapid closure of the valve.

[0018] Optionally, the rotational reset assembly includes a sleeve, which is sleeved on the outside of the rotating shaft, a limiting ridge is provided on the inner wall of the sleeve, a raised portion abutting against one side of the limiting ridge is provided on the rotating shaft, the middle of the connecting end cover extends toward the inside of the shell to form a cylindrical connecting portion, one end of the sleeve is rotatably sleeved on the outside of the connecting portion, a torsion spring is provided between the sleeve and the connecting portion, and the sleeve applies torsion force to the torsion spring when it rotates.

[0019] By adopting the above technical solution, when the shaft rotates to one side, the sleeve is driven to rotate synchronously through the cooperation between the raised portion and the limiting ridge on the inner wall of one of the sleeves, the sleeve and the connecting portion on the connecting end cover rotate relatively, and the sleeve applies a torsion force to the torsion spring. When the shaft needs to be reset to close the valve, the drive motor no longer drives the shaft to rotate, and the torsion spring applies a reverse force to the shaft through the sleeve, and the shaft rotates in the reverse direction to reset. The reverse rotation of the shaft drives the valve core to move axially and reset, thereby realizing rapid closure of the valve.

[0020] Optionally, a ratchet is circumferentially arranged on one end surface of the sleeve close to the connecting end cover, an annular groove is opened on the connecting end cover corresponding to the ratchet, a pawl is arranged inside the annular groove, the pawl is free to move axially inside the groove, and the pawl cooperates with the ratchet to limit the sleeve from rotating in a single direction.

[0021] By adopting the above technical solution, when the shaft drives the sleeve to rotate, the ratchet and the pawl cooperate to make the sleeve rotate in a single direction. When the valve needs to be kept open, the motor is turned off, and the sleeve is limited by the cooperation of the ratchet and the pawl to prevent the sleeve from rotating in the opposite direction, thereby limiting the shaft and keeping the valve core in the working position, thereby ensuring the stable opening of the valve.

[0022] Optionally, an electromagnet is disposed inside the groove, the pawl is made of magnetic material, a controller is disposed outside the shell, and the controller is electrically connected to the electromagnet for controlling the on / off and direction of current in the electromagnet.

[0023] By adopting the above technical solution, during the operation of the valve, the electromagnet is energized so that the magnetism of the electromagnet is the same as that of the pawl. Under the action of repulsive magnetic forces, the pawl fits tightly with the ratchet on the surface of the sleeve to limit the rotation of the sleeve in a single direction. When the valve needs to be closed, the controller controls the current in the electromagnet to be transmitted in the reverse direction, changes the magnetism of the electromagnet, and makes the magnetism of the electromagnet opposite to that of the pawl. The electromagnet attracts the pawl, and the pawl disengages from the ratchet and no longer limits the sleeve, so that the sleeve can rotate in the reverse direction and reset under the action of the torsion spring.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The servo motor is used to directly drive the valve core assembly in this application, which eliminates the complex conversion link in the middle and has the advantages of simple structure, fast response speed, high control accuracy and low energy consumption;

[0026] 2. In the present application, a reset mechanism is arranged in the middle of the rotating shaft. When the rotating shaft rotates, the sleeve inside the reset mechanism rotates with the rotating shaft. When the valve is closed, the torsion spring applies a reverse force to the sleeve to drive the sleeve to drive the rotating shaft to rotate in the opposite direction and reset, thereby realizing a rapid reset of the valve core to close the valve, ensuring that the valve can be quickly closed in an emergency, thereby improving the safety of the valve and the response speed of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the internal structure of a servo motor direct-driven proportional servo valve in an embodiment of the present application.

[0028] Figure 2 It is a servo motor direct drive proportional servo valve in the embodiment of the present application. Figure 1 A magnified schematic diagram of local A.

[0029] Figure 3 It is a schematic diagram of the shaft sleeve structure of a servo motor direct-driven proportional servo valve in an embodiment of the present application.

[0030] Figure 4 It is a schematic diagram of the connection end cover structure of a servo motor direct-driven proportional servo valve in an embodiment of the present application.

[0031] Figure 5 It is a schematic diagram of the structure of a sliding coupling of a servo motor direct-driven proportional servo valve in an embodiment of the present application.

[0032] Explanation of the accompanying drawings: 1. Photoelectric encoder; 2. Drive motor; 3. Valve body; 4. Reset mechanism; 41. Connecting end cover; 42. Shell; 43. Connecting part; 44. Bushing; 45. Torsion spring; 46. Limiting ridge; 47. Ratchet; 48. Electromagnet; 49. Bearing; 410. Controller; 411. Groove; 412. Ratchet; 5. Sliding coupling; 51. Connecting hole; 6. Rotating shaft; 61. Connecting head; 62. Protrusion; 7. Sealing gasket; 8. Valve core; 9. Ball screw; 10. Screw nut; 11. End cover; 12. First oil outlet; 13. Second oil outlet; 14. Oil inlet; 15. Cavity. DETAILED DESCRIPTION

[0033] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0034] See also Figure 1-5 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of this application, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical content disclosed in this application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this application. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this application without substantially changing the technical content.

[0035] The following is combined with Figure 1-5 This application is described in further detail.

[0036] This embodiment discloses a servo motor directly driven proportional servo valve.

[0037] Reference Figure 1A servo motor direct-driven proportional servo valve comprises a valve body 3, a first oil outlet 12, a second oil outlet 13 and an oil inlet 14 are respectively arranged on the surface of the valve body 3, a valve core 8 is arranged inside the valve body 3, a cavity 15 is arranged inside the valve body 3, one end of the cavity 15 is connected to the first oil outlet 12, the other end is connected to the second oil outlet 13, the middle of the cavity 15 is connected to the oil inlet 14, the valve core 8 is arranged inside the connection between the first oil outlet 12 and the second oil outlet 13 and the cavity 15, and the valve core 8 protrudes outwardly corresponding to the connection between the first oil outlet 12 and the second oil outlet 13 and the cavity 15 to form a blocking part, and one end of the valve body 3 is connected to a driving motor 2, and the driving motor 2 adopts a servo motor Machine, one side of the drive motor 2 is electrically connected with a photoelectric encoder 1, the output shaft of the drive motor 2 is connected to the valve core 8 through a transmission mechanism, the drive motor 2 drives the valve core 8 to reciprocate axially through the transmission mechanism, the transmission mechanism includes a ball screw 9 connected to one end of the valve core 8, one end of the valve body 3 is provided with a screw nut 10 matched with the ball screw 9, the outer cover of the screw nut 10 is provided with an end cover 11, the other end of the valve core 8 is connected with a rotating shaft 6, the drive motor 2 is connected to the rotating shaft 6 through a sliding coupling 5, and the rotating shaft 6 is driven to rotate through the sliding coupling 5, a reset mechanism 4 is provided between the drive motor 2 and the valve body 3, and the reset mechanism 4 is connected to the rotating shaft 6.

[0038] Reference Figure 2 , Figure 3 and Figure 4 The reset mechanism 4 includes a shell 42, and connecting end covers 41 are connected to both ends of the shell 42. A sealing gasket 7 is provided at the connection between the connecting end cover 41 and the valve body 3. Two sets of rotary reset components are symmetrically arranged inside the shell 42. The rotating shaft 6 runs through the shell 42. The rotary reset component is sleeved on the rotating shaft 6. The rotary reset component includes a sleeve 44, which is sleeved on the outside of the rotating shaft 6. A limited convex ridge 46 is provided on the inner wall of the sleeve 44. A protrusion 62 abutting against one side of the limited convex ridge 46 is provided on the rotating shaft 6. The middle of the connecting end cover 41 extends toward the inside of the shell 42 to form a cylindrical connecting portion 43. One end of the sleeve 44 is rotatably sleeved on the outside of the connecting portion 43. A sleeve 44 is provided between the sleeve 44 and the connecting portion 43. There is a torsion spring 45, and when the sleeve 44 rotates, a torsion force is applied to the torsion spring 45. A ratchet 412 is circumferentially arranged on the surface of one end of the sleeve 44 close to the connecting end cover 41, and an annular groove 411 is opened on the connecting end cover 41 corresponding to the ratchet 412. A pawl 47 is arranged inside the annular groove 411. The pawl 47 can move freely along the axial direction inside the groove 411. The pawl 47 cooperates with the ratchet 412 to limit the sleeve 44 from rotating in a single direction. An electromagnet 48 is arranged inside the groove 411, and the pawl 47 is made of magnetic material. A controller 410 is arranged on the outside of the shell 42. The controller 410 is electrically connected to the electromagnet 48 to control the on and off of the current and the direction of the current in the electromagnet 48.

[0039] Reference Figure 5The sliding coupling 5 is fixedly connected to the output shaft of the driving motor 2. A connecting hole 51 is provided in the middle of one end of the sliding coupling 5 close to the rotating shaft 6. A connecting head 61 adapted to the connecting hole 51 is provided at the end of the rotating shaft 6. The connecting head 61 is axially movably inserted into the connecting hole 51. Both the connecting hole 51 and the connecting head 61 are set to be polygonal.

[0040] The implementation principle of a servo motor direct-driven proportional servo valve in this embodiment is:

[0041] When the valve is closed, the valve core 8 is located in the middle of the valve body 3. The sealing portion on the valve core 8 seals the connection between the cavity and the first oil outlet and the second oil outlet. When the valve is opened, the driving motor 2 drives the rotating shaft 6 to rotate through the sliding coupling 5. The rotating shaft 6 drives the valve core 8 and the ball screw 9 to rotate. The ball screw 9 and the screw nut 10 cooperate to drive the valve core 8 to move axially. During the positive rotation of the rotating shaft 6, the raised portion 62 on one end of the rotating shaft 6 is aligned with the inner portion of the shaft sleeve 44 on the same side. The limiting ridge 46 of the part abuts against the boss 62, and the boss 62 cooperates with the limiting ridge 46 to drive the sleeve 44 to rotate synchronously. The sleeve 44 and the connecting part 43 on the connecting end cover 41 rotate in an offset manner. The sleeve 44 applies a torsion force to the torsion spring 45 so that the torsion spring 45 has an elastic force inside. During the rotation of the sleeve, the controller 410 controls the current direction of the electromagnet 48 so that the magnetism of the electromagnet 48 and the pawl 47 are opposite, and the electromagnet 48 and the pawl 47 repel each other. The pawl 47 and the The ratchet teeth 412 on the sleeve 44 are meshed, and the pawl 47 limits the sleeve 44 to rotate in only one direction, so that the valve is kept open. Even if the servo motor is turned off, the sleeve 44 remains in position under the action of the ratchet teeth 412 and the pawl 47, so that the valve remains open. When an emergency occurs or the valve needs to be closed immediately, the controller 410 changes the current direction of the electromagnet 48 so that the magnetism of the electromagnet 48 is different from that of the pawl 47. The pawl 47 is adsorbed by the electromagnet 48 and separated from the ratchet teeth 412. After the ratchet teeth 412 are separated from the restriction of the pawl 47, the torsion spring 45 applies a reverse elastic force to the sleeve 44 to drive the sleeve 44 and the rotating shaft 6 to rotate in the opposite direction, so that the rotating shaft 6 rotates in the opposite direction to the initial position. At this time, the valve core 8 also moves axially to the initial position, and the valve is closed. Similarly, when the servo motor drives the rotating shaft 6 to rotate in the opposite direction, the protrusion 62 at the other end of the rotating shaft 6 drives the sleeve 44 at the other end to rotate synchronously, thereby also realizing the above-mentioned function.

[0042] In summary, the present application adopts the method of directly driving the valve core assembly with a servo motor, which eliminates the complex conversion link in the middle and has the advantages of simple structure, fast response speed, high control accuracy, low energy consumption, etc. In the present application, a reset mechanism is set in the middle of the rotating shaft. When the rotating shaft rotates, the shaft sleeve inside the reset mechanism rotates with the rotating shaft. When the valve is closed, the shaft sleeve is driven by the torsion spring to apply a reverse force to the shaft sleeve to drive the shaft to rotate in the opposite direction and reset, thereby realizing the rapid reset of the valve core and closing the valve, ensuring that the valve can be quickly closed in an emergency, improving the safety of the valve, and improving the response speed of the valve. Therefore, the present application effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0043] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present application shall still be included in the protection scope of the present application.

Claims

1. A servo motor direct-driven proportional servo valve, comprising a valve body (3), wherein a first oil outlet (12), a second oil outlet (13) and an oil inlet (14) are respectively arranged on the surface of the valve body (3), a valve core (8) is arranged inside the valve body (3), and the valve core (8) enables the oil inlet (14) to communicate with the first oil outlet (12) and the second oil outlet (13) through axial movement, characterized in that: One end of the valve body (3) is connected to a drive motor (2); the output shaft of the drive motor (2) is in transmission connection with the valve core (8) via a transmission mechanism; the drive motor (2) drives the valve core (8) to reciprocate along the axial direction via the transmission mechanism; the transmission mechanism comprises a ball screw (9) connected to one end of the valve core (8); one end of the valve body (3) is provided with a screw nut (10) matched with the ball screw (9); the other end of the valve core (8) is connected to a rotating shaft (6); the drive motor (2) is in transmission connection with the rotating shaft (6) to drive the rotating shaft (6) to rotate; A reset mechanism (4) is provided between the driving motor (2) and the valve body (3), the reset mechanism (4) being connected to the rotating shaft (6), the reset mechanism (4) being used to drive the rotating shaft (6) to rotate and reset to an initial position, the reset mechanism (4) comprising a shell (42), both ends of the shell (42) being connected to connecting end covers (41), two sets of rotation reset components being centrally symmetrically provided inside the shell (42), the rotating shaft (6) passing through the shell (42), and the rotation reset components being sleeved on the rotating shaft (6); The rotary reset assembly comprises a sleeve (44), the sleeve (44) being sleeved on the outside of the rotating shaft (6), a limiting ridge (46) being provided on the inner wall of the sleeve (44), a protrusion (62) being provided on the rotating shaft (6) and abutting against one side of the limiting ridge (46), a cylindrical connecting portion (43) extending from the middle of the connecting end cover (41) toward the inside of the housing (42), one end of the sleeve (44) being rotatably sleeved on the outside of the connecting portion (43), and a torsion spring (45) being provided between the sleeve (44) and the connecting portion (43). When the shaft sleeve (44) rotates, a torsion force is applied to the torsion spring (45); a ratchet (412) is circumferentially arranged on one end surface of the shaft sleeve (44) close to the connecting end cover (41); an annular groove (411) is provided on the connecting end cover (41) corresponding to the ratchet (412); a ratchet (47) is arranged inside the annular groove (411); the ratchet (47) is freely movable in the axial direction inside the groove (411); the ratchet (47) cooperates with the ratchet (412) to limit the shaft sleeve (44) from rotating in a single direction; An electromagnet (48) is disposed inside the groove (411), the pawl (47) is made of magnetic material, a controller (410) is disposed outside the housing (42), and the controller (410) is electrically connected to the electromagnet (48) for controlling the on / off state and direction of current in the electromagnet (48).

2. A servo motor direct-driven proportional servo valve according to claim 1, characterized in that: The drive motor (2) is a servo motor, and one side of the drive motor (2) is electrically connected to a photoelectric encoder (1).

3. The servo motor direct-driven proportional servo valve according to claim 1, characterized in that: The output shaft of the drive motor (2) is connected to the rotating shaft (6) via a sliding coupling (5); the sliding coupling (5) is fixedly connected to the output shaft of the drive motor (2); a connecting hole (51) is provided in the middle of one end of the sliding coupling (5) close to the rotating shaft (6); a connecting head (61) adapted to the connecting hole (51) is provided at the end of the rotating shaft (6); the connecting head (61) is movably inserted into the connecting hole (51) along the axial direction; and the connecting hole (51) and the connecting head (61) are both configured as polygons.

4. A servo motor direct-driven proportional servo valve according to claim 1, characterized in that: A cavity (15) is provided inside the valve body (3); one end of the cavity (15) is connected to the first oil outlet (12), and the other end is connected to the second oil outlet (13); the middle of the cavity (15) is connected to the oil inlet (14); the valve core (8) is provided at the connection between the first oil outlet (12), the second oil outlet (13) and the cavity (15); a portion of the valve core (8) corresponding to the connection between the first oil outlet (12), the second oil outlet (13) and the cavity (15) protrudes outwards to form a blocking portion.

Images