High-precision reciprocating linear motion propulsion device

Abstract

The present invention relates to the technical field of hydraulic devices, specifically to a high-precision reciprocating linear motion propulsion device. It includes a hydraulic cylinder, a control valve is provided on one side of the hydraulic cylinder, the hydraulic cylinder and the control valve are connected through an oil pipe, a motor is provided on one side of the control valve, the control valve includes a valve body, a valve sleeve is provided in the valve body, a valve core is provided in the valve sleeve, the valve core is connected to the output end of the motor, a mounting head is provided on the end face of the valve core in contact with the valve sleeve, a convex portion is provided on the outer wall of the mounting head, annular grooves are provided on the outer wall of the valve sleeve at intervals, a mounting groove is provided in the valve sleeve, a movable groove is provided on the inner wall of the mounting groove, and oil ports are provided on the outer wall of the valve body at intervals. The present invention can combine the feedback cooperation between the valve sleeve, the valve core and the piston rod, abolish magnetic induction conduction, and realize high-precision control; at the same time, through the rotation limit cooperation between the mounting groove, the movable groove, the mounting head and the convex portion, the steps of hole positioning and debugging are simplified, and the operation is more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic devices, in particular to a high-precision reciprocating linear motion propulsion device. Background Art

[0002] Hydraulics is a widely used transmission technology in industry. In the field of linear motion, it is very popular because of its heavy-load, smooth, impact-resistant and reliable performance. With the rapid development of science and technology, automation and digitalization have become the mainstream. Hydraulic cylinders, as the actuators of hydraulic systems, are increasingly combined with electronic technology.

[0003] At present, the methods for directly or indirectly controlling the accuracy of hydraulic cylinders on the market mainly include direct driving and controlling the movement of the spool of the hydraulic valve by a stepper / servo motor, with a mechanical feedback structure that directly connects the ball screw to the spool, or relying on a magnetostrictive sensor. However, by controlling the movement of the spool of the hydraulic valve, it is not easy to achieve dynamic matching of the driving force and the feedback force in the entire working cycle, which affects the dynamic response of the spool and the hydraulic cylinder, and there is also a risk of failure. The magnetostrictive sensor has poor anti-interference ability and high environmental requirements, making it difficult to achieve high-precision control of the propulsion device. Summary of the invention

[0004] The present invention provides a high-precision reciprocating linear motion propulsion device to solve the problems raised in the above background technology.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a high-precision reciprocating linear motion propulsion device, including a hydraulic cylinder, a control valve is arranged on one side of the hydraulic cylinder, the hydraulic cylinder and the control valve are connected through an oil pipe, a motor is arranged on one side of the control valve, a piston rod is movably installed in the hydraulic cylinder, a screw rod is arranged in the piston rod, a piston sleeve is arranged on one side of the piston rod, a screw nut adapted to the screw rod is arranged in the piston sleeve, the control valve includes a valve body, a valve sleeve is arranged in the valve body, a valve core is arranged in the valve sleeve, a control valve is extended out of one side of the valve sleeve to be connected with the screw rod, and the valve core is connected to the screw rod. The output end of the motor is connected, the outer wall of the valve core is provided with 4 dividing planes arranged at 90 degrees respectively, the dividing planes are provided with through holes that penetrate the mutually parallel dividing planes, the valve core is provided with a mounting head on the end face that contacts the valve sleeve, the outer wall of the mounting head is provided with a protrusion, the outer wall of the valve sleeve is provided with annular grooves at intervals, valve sleeve holes are staggered in the annular grooves, the valve sleeve is provided with a mounting groove adapted to the mounting head, the inner wall of the mounting groove is provided with a movable groove adapted to the protrusion, and the outer wall of the valve body is provided with oil ports corresponding to the positions of the annular grooves at intervals.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: through the cooperation of structures such as the screw rod, the valve sleeve, and the valve core, the device can combine the feedback cooperation between the valve sleeve, the valve core, and the piston rod, eliminate magnetic induction conduction, achieve high-precision control, and avoid potential failure hazards during motion control; at the same time, through the rotation limit cooperation between the mounting groove, the movable groove, the mounting head, and the protrusion, the steps of hole positioning and debugging are simplified, and the operation is more convenient.

[0007] As a further improvement of the present invention, the technical problem to be solved is: the stability of the hydraulic cylinder needs to be further improved.

[0008] In order to solve the above technical problems, the present invention further improves the technical solution adopted as follows: the hydraulic cylinder includes a cylinder body, a cylinder head is arranged on one side of the cylinder body, a cylinder bottom is arranged in the cylinder body, a bearing seat is arranged on one side of the cylinder bottom, and one side of the screw rod extends out of the cylinder bottom, passes through the bearing seat and is rotatably connected to the bearing seat.

[0009] The beneficial effects of the above improvements are as follows: by setting the cylinder head, cylinder body, cylinder bottom and other structures, the operation of the piston rod in the hydraulic cylinder is limited, which ensures the reliability of the screw rod rotating in the hydraulic cylinder and makes the operation of the hydraulic cylinder more stable.

[0010] As a further improvement of the present invention, the technical problem to be solved is: it is necessary to further improve the structural stability of the control valve.

[0011] In order to solve the above technical problems, the present invention further improves the technical solution adopted as follows: one side of the valve body is fixedly connected to the hydraulic cylinder through a first valve cover, and the other side of the valve body is fixedly connected to the motor through a second valve cover.

[0012] The beneficial effect of the above improvement is that through the arrangement of the first valve cover, valve body, second valve cover and other structures, the first valve cover and the second valve cover of the device can limit the axial movement of the valve sleeve and the valve core, further improving the stability of the control valve.

[0013] As a further improvement of the present invention, the technical problem to be solved is: it is necessary to further improve the precise control effect of the control valve on the piston rod in the hydraulic cylinder.

[0014] In order to solve the above technical problems, the present invention further improves the technical solution adopted as follows: a boss extending out of the first valve cover is provided at one end of the valve sleeve, a connecting shaft is provided on the boss, the connecting shaft extends into the moving cylinder and is fixedly connected to one end of the screw rod through a coupling.

[0015] The beneficial effect of the above improvement is: by setting the connecting shaft, coupling and other structures, the valve sleeve and the screw rod of the device are directly fixedly connected through the coupling, and the rotation of the screw rod is directly applied to the valve sleeve, the feedback is more precise, and the operation is more stable.

[0016] As a further improvement of the present invention, the technical problem to be solved is: it is necessary to monitor and sense the operating state of the piston rod in the hydraulic cylinder in real time to facilitate the control valve to continuously control it.

[0017] In order to solve the above technical problems, the present invention further improves the technical solution adopted as follows: an encoder adapted to the coupling is arranged on the inner wall of the cylinder body.

[0018] The beneficial effect of the above improvement is that, through the setting of the encoder, the device can monitor and sense the rotation state of the screw rod in real time, thereby calculating the stroke and speed, etc., so as to facilitate the control valve to continuously control it.

[0019] As a further improvement of the present invention, the technical problem to be solved is that the control of the opening and closing brought about by the rotation angle between the valve sleeve and the valve core and the synchronization or asynchrony requires accurate orientation.

[0020] In order to solve the above technical problems, the present invention further improves the technical solution adopted as follows: the valve sleeve holes in the annular groove are staggered at an angle of 135° from the first valve cover to the second valve cover, 90° from the second hole to the third hole, and 45° from the third hole to the fourth hole.

[0021] The beneficial effect of the above improvement is that by setting the staggered angle, the rotation angle between the valve sleeve and the valve core and the opening and closing control brought about by the synchronous or asynchronous rotation can be accurately oriented, further facilitating the control of the control valve.

[0022] As a further improvement of the present invention, the technical problem to be solved is: the hydraulic flow channel controlled and driven by the device needs to be able to cooperate with the hydraulic cylinder and the control valve.

[0023] In order to solve the above technical problems, the present invention further improves the technical solution adopted as follows: the oil port includes a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port and the fourth oil port are arranged in parallel directly above the annular groove where the first valve sleeve hole is located and the annular groove where the fourth valve sleeve hole is located, the second oil port and the third oil port are staggered by 180°, corresponding to the positions of the annular groove where the second valve sleeve hole is located and the annular groove where the third valve sleeve hole is located, respectively.

[0024] The beneficial effect of the above improvement is that through the arrangement of the first oil port, the second oil port, the third oil port, the fourth oil port and other structures, the hydraulic flow path of the device can be coordinated with the control logic of the hydraulic cylinder and the control valve, and the flow path layout is more reasonable.

[0025] As a further improvement of the present invention, the technical problem to be solved is: it is required that the device can further simplify the operation steps of hole positioning and debugging coordination between the valve sleeve and the valve core.

[0026] In order to solve the above technical problems, the present invention further improves the technical solution adopted as follows: the mounting head is truncated cone-shaped, the movable groove is a fan-shaped groove, and the stroke of the groove is adapted to the rotation control stroke between the valve sleeve and the valve core.

[0027] The beneficial effect of the above improvement is that, by setting the frustum of the mounting head and the length of the movable slot, the device can further facilitate the operation steps of hole positioning and debugging coordination between the valve sleeve and the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention.

[0030] Figure 3 It is a schematic diagram of a three-dimensional partial cross-sectional structure of the hydraulic cylinder of the present invention.

[0031] Figure 4 Schematic diagram of the three-dimensional cross-sectional structure of the control valve part of the present invention

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the valve body of the present invention.

[0033] Figure 6 It is a schematic diagram of the three-dimensional structure of the valve sleeve of the present invention.

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the valve core of the present invention.

[0035] Figure 8 It is a schematic diagram of the cross-sectional structure of the valve body of the present invention.

[0036] Fig. 9 It is a schematic diagram of the cross-sectional structure of the valve sleeve of the present invention.

[0037] Fig.10 It is a schematic cross-sectional structural diagram of the valve core of the present invention.

[0038] Fig.11 It is a schematic diagram of the side structure of the valve sleeve of the present invention.

[0039] Fig.12 It is a schematic diagram of the side structure of the valve core of the present invention.

[0040] Fig.13 It is a schematic diagram of the cross-sectional structure of the valve sleeve of the present invention in various viewing directions.

[0041] The text labels in the figure are as follows: 1. hydraulic cylinder; 11. cylinder head; 12. cylinder body; 13. cylinder bottom; 2. control valve; 21. first valve cover; 22. valve body; 221. first oil port; 222. second oil port; 223. third oil port; 224. fourth oil port; 23. second valve cover; 24. valve sleeve; 241. connecting shaft; 242. annular groove; 243. valve sleeve hole; 244. mounting groove; 245. movable groove; 25. valve core; 251. dividing plane; 252. through hole; 253. connecting hole; 254. mounting head; 255. raised part; 3. motor; 4. oil pipe; 5. piston rod; 51. piston sleeve; 52. screw rod; 53. screw rod nut; 6. bearing seat; 7. coupling; 8. encoder. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0043] Embodiment 1:

[0044] like Figure 1-13 As shown, a high-precision reciprocating linear motion propulsion device comprises a hydraulic cylinder 1, a control valve 2 is arranged on one side of the hydraulic cylinder 1, the hydraulic cylinder 1 and the control valve 2 are connected through an oil pipe 4, a motor 3 is arranged on one side of the control valve 2, a piston rod 5 is movably installed in the hydraulic cylinder 1, a screw rod 52 is arranged in the piston rod 5, a piston sleeve 51 is arranged on one side of the piston rod 5, a screw nut 53 adapted to the screw rod 52 is arranged in the piston sleeve 51, the control valve 2 comprises a valve body 22, a valve sleeve 24 is arranged in the valve body 22, a valve core 25 is arranged in the valve sleeve 24, one side of the valve sleeve 24 extends out of the control valve 2 and is connected to the screw rod 52, the valve core 25 is connected to the output end of the motor 3, and the outer wall of the valve core 25 The valve body 22 is provided with four dividing planes 251 arranged at 90 degrees, and the dividing planes 251 are provided with through holes 252 that penetrate the mutually parallel dividing planes 251. The valve core 25 is provided with a mounting head 254 on the end surface that contacts the valve sleeve 24, and a protrusion 255 is provided on the outer wall of the mounting head 254. The outer wall of the valve sleeve 24 is provided with annular grooves 242 at intervals, and valve sleeve holes 243 are staggered in the annular grooves 242. The valve sleeve 24 is provided with a mounting groove 244 adapted to the mounting head 254, and the inner wall of the mounting groove 244 is provided with a movable groove 245 adapted to the protrusion 255. The outer wall of the valve body 22 is provided with oil ports corresponding to the positions of the annular grooves 242 at intervals. The mounting head 254 is truncated cone-shaped, and the movable groove 245 is a fan-shaped groove, and the stroke of the groove is adapted to the rotation control stroke between the valve sleeve 24 and the valve core 25.

[0045] In this embodiment, the valve sleeve 24 has an annular groove 242 along the direction from the first valve cover 21 to the second valve cover 23, which respectively corresponds to the first oil port 221, the second oil port 222, the third oil port 223, and the fourth oil port 224 on the valve body 22, thereby the spaced annular grooves 242 are named as the first annular groove, the second annular groove, the third annular groove and the fourth annular groove in sequence along this direction.

[0046] Specific working principle: This device is composed of a hydraulic cylinder 1, a control valve 2 and a motor 3. When in use, the hydraulic pump is connected to the control valve 2, the oil inlet end of the hydraulic pump is connected to the third oil port 223 on the valve body 22, and the oil outlet end is connected to the second oil port 222 on the valve body 22. The hydraulic pump is started, and the hydraulic oil is pumped into the valve body 22 from the third oil port 223; when the control driving hydraulic cylinder 1 is running forward, the hydraulic oil enters the valve sleeve hole 243 at the position of the third annular groove from the third oil port 223, and then passes through the corresponding separation plane 251 of the valve core 25 The oil passes through the through hole 252 on the inner surface of the hydraulic cylinder 1, and then comes out from the first oil port 221 corresponding to the first annular groove, enters the hydraulic cylinder 1, and pushes the piston rod 5 to move forward. At the same time, as the piston rod 5 moves, the hydraulic oil previously in the hydraulic cylinder 1 (the hydraulic oil at the front end of the piston rod 5) will be discharged from the hydraulic cylinder 1, and enter the valve sleeve hole 243 on the fourth annular groove of the valve sleeve 24 through the fourth oil port 224, and then enter the second annular groove through the through hole 252 on the dividing plane 251 corresponding to the valve core 25, and then be discharged from the second oil port 222 at this position. That is, when the hydraulic cylinder 1 needs to run in the forward direction, the valve core 25 is rotated until the third annular groove is connected to the first annular groove, the corresponding third oil port 223 is connected to the first oil port 221, the fourth annular groove is connected to the second annular groove, and the corresponding fourth oil port 224 is connected to the second oil port 222; when the hydraulic cylinder 1 needs to run in the reverse direction, the valve core 25 is rotated half a circle, the third oil port 223 corresponding to the third annular groove and the fourth annular groove is connected to the fourth oil port 224, the first annular groove and the second annular groove corresponding to the first oil port 221 and the second oil port 222 are connected, the direction of oil output and oil discharge begins to reverse, and the control logic is consistent with that during forward operation.

[0047] At this time, due to the movement of the piston rod 5 in the hydraulic cylinder 1, the piston sleeve 51 and the screw nut 53 will be driven to move synchronously. Due to the threaded connection between the screw nut 53 and the screw 52, ​​the screw 52 is driven to start rotating, and the fixed connection between the screw 52 and the valve sleeve 24 will cause the valve sleeve 24 to rotate accordingly; and the motor 3 is started, and the valve core 25 is driven to rotate synchronously with the valve sleeve 24 through the output end of the motor 3, so that the current movement posture of the piston rod 5 in the hydraulic cylinder 1 can be maintained; if the piston rod 5 needs to move back and forth, the rotation of the valve core 25 is adjusted to continuously switch the oil circuit in the control valve 2; when the hydraulic cylinder 1 runs to the required stroke, the motor 3 is disconnected, and the valve core 25 stops rotating through the motor 3, and the valve sleeve 24 continues to rotate until the corresponding through hole 252 and the separation plane 251 area are staggered (rotated a quarter of a circle) during the rotation process, and the corresponding connected valve sleeve hole 243 is blocked and separated, and also stops rotating, so that the oil circuit of the control valve 2 is closed, and the control hydraulic cylinder 1 stops running.

[0048] During use of the device, the relative rotation angle of the valve core 25 in the valve sleeve 24 is limited through the active cooperation between the movable groove 245 and the protrusion 255, and the position of the movable groove 245 is at the two end limit positions of the rotation angle of the protrusion 255 in the movable groove 245 (the rotation angle of the protrusion 255 in the movable groove 245 is 90°, i.e., half a circle), which just corresponds to the control position between the valve sleeve 24 and the valve core 25 for controlling the forward and reverse operation of the piston rod 5 in the hydraulic cylinder 1, and when the protrusion 255 stays in the middle position of the movable groove 245, it is the position of closing the control valve 2 between the valve sleeve 24 and the valve core 25. When the starter motor 3 drives the valve core 25 to rotate, until the protrusion 255 hits the edge of the movable groove 245 to open the flow channel of the control valve 2, the hydraulic cylinder 1 is driven to start running, and the valve sleeve 24 in the control valve 2 is rotated by the feedback mechanism of the piston rod 5, and the valve core 25 is also driven to rotate synchronously through the cooperation of the movable groove 245 and the protrusion 255. That is, through the setting of the truncated cone shape of the mounting head 254 and the length and stroke of the movable groove 245, the device can further facilitate the operation steps of hole positioning and debugging coordination between the valve sleeve 24 and the valve core 25.

[0049] During the above-mentioned whole process, the device performs linkage control between the control valve 2 and the motion cylinder 1 through the cooperation of structures such as the valve body 2, the valve sleeve 24, and the valve core 25, that is, the control process in the control valve 2 will be coordinated with the working process in the motion cylinder 1 to achieve precise control, and the control process and control logic are more concise and reasonable; at the same time, the device combines the feedback cooperation between the valve sleeve 24, the valve core 25 and the piston rod 5 to eliminate magnetic induction conduction, achieve high-precision control, and avoid potential failure hazards in the motion control process; through the rotation limit cooperation between the installation groove 244, the movable groove 245, the installation head 254, and the protrusion 255, the steps of hole positioning and debugging are simplified, and the operation is more convenient.

[0050] Embodiment 2:

[0051] like Figure 1-4 As shown, it is further optimized on the basis of the above embodiment: the hydraulic cylinder 1 includes a cylinder body 12, a cylinder head 11 is arranged on one side of the cylinder body 12, a cylinder bottom 13 is arranged in the cylinder body 12, a bearing seat 6 is arranged on one side of the cylinder bottom 13, and one side of the screw rod 52 extends out of the cylinder bottom 13, passes through the bearing seat 6 and is rotatably connected with the bearing seat 6. Through the arrangement of the cylinder head 11, the cylinder body 12, the cylinder bottom 13 and other structures, the operation of the piston rod 5 in the hydraulic cylinder 1 is limited, the reliability of the screw rod 52 rotating in the hydraulic cylinder 1 is ensured, and the operation of the hydraulic cylinder 1 is more stable. One side of the valve body 22 is fixedly connected to the hydraulic cylinder 1 through the first valve cover 21, and the other side of the valve body 22 is fixedly connected to the motor 3 through the second valve cover 23. Through the arrangement of the first valve cover 21, the valve body 22, the second valve cover 23 and other structures, the first valve cover 21 and the second valve cover 23 of the device can limit the axial movement of the valve sleeve 24 and the valve core 25, further improving the stability of the control valve 2.

[0052] Embodiment 3:

[0053] like Figure 2 , Figure 3 As shown, it is further optimized on the basis of the above embodiment: one end of the valve sleeve 24 is provided with a boss extending out of the first valve cover 21, and the boss is provided with a connecting shaft 241, and the connecting shaft 241 extends into the motion cylinder 1 and is fixedly connected to one end of the screw rod 52 through the coupling 7. Through the arrangement of the connecting shaft 241, the coupling 7 and other structures, the valve sleeve 24 of the device is directly fixedly connected with the screw rod 52 through the coupling 7, and the rotation of the screw rod 52 is directly applied to the valve sleeve 24, so that the feedback is more accurate and the operation is more stable. An encoder 8 adapted to the coupling 7 is arranged on the inner wall of the cylinder body 12. Through the arrangement of the encoder 8, the device can monitor and sense the rotation state of the screw rod 52 in real time, thereby calculating the stroke and speed, etc., so as to facilitate the continuous control of the control valve 2.

[0054] Embodiment 4:

[0055] like Figure 4-13 As shown, based on the above embodiment, the valve sleeve hole 243 in the annular groove 242 is further optimized in the direction from the first valve cover 21 to the second valve cover 23. The staggered angles are: 135° between the first hole and the second hole, 90° between the second hole and the third hole, and 45° between the third hole and the fourth hole. By setting the staggered angles, the rotation angle between the valve sleeve 24 and the valve core 25 and the opening and closing control brought about by synchronous or asynchronous rotation can be accurately oriented, further facilitating the control of the control valve 2. The oil ports include a first oil port 221, a second oil port 222, a third oil port 223 and a fourth oil port 224. The first oil port 221 and the fourth oil port 224 are arranged in parallel to the annular groove 242 where the first valve sleeve hole 243 is located and the annular groove 242 where the fourth valve sleeve hole 243 is located. The second oil port 222 and the third oil port 223 are staggered by 180 degrees, respectively corresponding to the positions of the annular groove 242 where the second valve sleeve hole 243 is located and the annular groove 242 where the third valve sleeve hole 243 is located. Through the arrangement of the first oil port 221, the second oil port 222, the third oil port 223, the fourth oil port 224 and other structures, the hydraulic flow channel of the device can be coordinated with the control logic of the hydraulic cylinder 1 and the control valve 2, and the flow channel arrangement is more reasonable.

[0056] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0057] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A high-precision reciprocating linear motion propulsion device, comprising a hydraulic cylinder (1), a control valve (2) being provided on one side of the hydraulic cylinder (1), the hydraulic cylinder (1) and the control valve (2) being connected via an oil pipe (4), and a motor (3) being provided on one side of the control valve (2), characterized in that: A piston rod (5) is movably mounted in the hydraulic cylinder (1), a screw rod (52) is arranged in the piston rod (5), a piston sleeve (51) is arranged on one side of the piston rod (5), a screw nut (53) adapted to the screw rod (52) is arranged in the piston sleeve (51), the control valve (2) comprises a valve body (22), a valve sleeve (24) is arranged in the valve body (22), a valve core (25) is arranged in the valve sleeve (24), one side of the valve sleeve (24) extends out of the control valve (2) and is connected to the screw rod (52), the valve core (25) is connected to the output end of the motor (3), and four dividing planes (251) arranged at 90 degrees are arranged on the outer wall of the valve core (25), and through holes (251) are provided on the dividing planes (251) that penetrate the mutually parallel dividing planes (251) 252), the valve core (25) is provided with a mounting head (254) on the end face in contact with the valve sleeve (24), a protrusion (255) is provided on the outer wall of the mounting head (254), annular grooves (242) are provided at intervals on the outer wall of the valve sleeve (24), valve sleeve holes (243) are provided in the annular grooves (242) at intervals, a mounting groove (244) adapted to the mounting head (254) is provided in the valve sleeve (24), a movable groove (245) adapted to the protrusion (255) is provided on the inner wall of the mounting groove (244), and oil ports corresponding to the positions of the annular grooves (242) are provided at intervals on the outer wall of the valve body (22), and the corresponding relationship between the annular grooves (242) and the oil ports is adjusted by rotating the valve core (25) to control the working state of the hydraulic cylinder (1).

2. The high-precision reciprocating linear motion propulsion device according to claim 1, characterized in that: The hydraulic cylinder (1) comprises a cylinder body (12), a cylinder head (11) being arranged on one side of the cylinder body (12), a cylinder bottom (13) being arranged in the cylinder body (12), a bearing seat (6) being arranged on one side of the cylinder bottom (13), and one side of the screw rod (52) extending out of the cylinder bottom (13), passing through the bearing seat (6) and being rotatably connected to the bearing seat (6).

3. The high-precision reciprocating linear motion propulsion device according to claim 2, characterized in that: One side of the valve body (22) is fixedly connected to the hydraulic cylinder (1) via a first valve cover (21), and the other side of the valve body (22) is fixedly connected to the motor (3) via a second valve cover (23).

4. The high-precision reciprocating linear motion propulsion device according to claim 3, characterized in that: One end of the valve sleeve (24) is provided with a boss extending out of the first valve cover (21), and a connecting shaft (241) is provided on the boss. The connecting shaft (241) extends into the hydraulic cylinder (1) and is fixedly connected to one end of the screw rod (52) via a coupling (7).

5. The high-precision reciprocating linear motion propulsion device according to claim 4, characterized in that: An encoder (8) adapted to the coupling (7) is arranged on the inner wall of the cylinder body (12).

6. The high-precision reciprocating linear motion propulsion device according to claim 5, characterized in that: The valve sleeve holes (243) in the annular groove (242) are staggered at angles in the direction from the first valve cover (21) to the second valve cover (23): the first hole and the second hole are 135 degrees apart, the second hole and the third hole are 90 degrees apart, and the third hole and the fourth hole are 45 degrees apart.

7. The high-precision reciprocating linear motion propulsion device according to claim 6, characterized in that: The oil ports comprise a first oil port (221), a second oil port (222), a third oil port (223) and a fourth oil port (224); the first oil port (221) and the fourth oil port (224) are arranged in parallel and directly above the annular groove (242) where the first valve sleeve hole (243) is located and the annular groove (242) where the fourth valve sleeve hole (243) is located; the second oil port (222) and the third oil port (223) are staggered by 180 degrees and correspond to the positions of the annular groove (242) where the second valve sleeve hole (243) is located and the annular groove (242) where the third valve sleeve hole (243) is located, respectively.

8. The high-precision reciprocating linear motion propulsion device according to claim 1, characterized in that: The mounting head (254) is in the shape of a truncated cone, and the movable groove (245) is in the shape of a fan-shaped groove, the stroke of which is adapted to the rotation control stroke between the valve sleeve (24) and the valve core (25).

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