Hydraulic servo-motor

Abstract

The utility model provides a hydraulic servo-motor which comprises a shell which is of an integrally-formed structure. The pilot valve comprises an upper sleeve, a lower sleeve and an inner core, the inner core is located in the first cavity, the upper sleeve and the lower sleeve are installed on the inner core, a sliding valve assembly is arranged between the upper sleeve and the lower sleeve, a pilot valve upper cover is arranged above the sliding valve assembly, and the pilot valve upper cover is connected with the top of the sliding valve assembly through a pilot valve elastic piece and an ejector rod; the oil cylinder comprises a piston, a piston ring, a piston rod and an oil cylinder cover; the feedback mechanism comprises a scale plate, a feedback plate and a feedback lever, the feedback plate is hinged to the other end of the connecting plate, and the scale plate is fixed to the top of the connecting rod. According to the hydraulic servo-motor, due to the fact that the shell is of the integrally-formed structure, the complex step of assembling a plurality of parts is omitted, the production efficiency of the hydraulic servo-motor is improved, and meanwhile the phenomenon that oil leaks from the connecting positions of the parts after the sealing pieces are damaged can be prevented; in addition, due to the fact that the pilot valve comprises the inner core, machining and installation are more convenient and reasonable.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steam turbine regulation, and in particular to an oil motor. Background Art

[0002] The oil motor is the actuator of the steam turbine regulating valve. It converts the secondary oil signal input by the amplifier or electro-hydraulic converter into a stroke output with sufficient working capacity to operate the regulating steam valve and control the steam inlet of the steam turbine. The oil motor is mainly composed of an oil cylinder, a staggered throttle and a feedback mechanism. It is inconvenient to install. Moreover, since the oil motor will run for a long time, it is easy to cause damage to the internal seals, which will lead to oil leakage at the connection. In addition, the processing of the shell is also complicated. Utility Model Content

[0003] The present disclosure provides an oil motor to at least solve the above technical problems existing in the prior art.

[0004] The oil motor according to the present disclosure includes:

[0005] A shell, comprising a first cavity and a second cavity, wherein the shell is an integrally formed structure;

[0006] The staggered oil valve comprises an upper sleeve, a lower sleeve and an inner core, wherein the inner core is located in the first cavity, the upper sleeve and the lower sleeve are mounted on the inner core, a sliding valve assembly is arranged between the upper sleeve and the lower sleeve, a staggered oil valve upper cover is arranged above the sliding valve assembly, and the staggered oil valve upper cover is connected to the top of the sliding valve assembly through a staggered oil valve elastic member and a push rod;

[0007] The oil cylinder comprises a piston, a piston ring, a piston rod and an oil cylinder cover, wherein a sealing assembly is provided between the piston rod and the oil cylinder cover, a guide rail and a feedback lever support are provided on the top of the oil cylinder cover, a connecting rod connected to a regulating steam valve lever is provided on the upper end of the piston rod, the connecting rod is connected to the regulating steam valve through a spherical bearing, a connecting plate is provided at the connection between the connecting rod and the piston rod, and one end of the connecting plate is connected to the guide rail;

[0008] The feedback mechanism includes a scale plate, a feedback plate and a feedback lever. The feedback plate is hinged to the other end of the connecting plate. The scale plate is fixed to the top of the connecting rod. An indicator pin is fixed to the top of the feedback plate. The indicator pin cooperates with the scale plate. An adjusting bolt for adjusting the position of the indicator pin is also provided on the upper part of the connecting rod. The feedback lever is arranged on the feedback lever support. One end of the feedback lever is connected to the feedback plate, and the other end is connected to the push rod through an adjusting bolt and an adjusting nut.

[0009] In one possible implementation manner, the inner core has a contoured cavity, the contoured cavity is used to load the upper sleeve, the sliding valve assembly and the lower sleeve, and the inner core is provided with a first through hole, a second through hole, a third through hole and a fourth through hole.

[0010] In one embodiment, the staggered oil valve further includes an upper spring seat and a lower spring seat, the upper end of the staggered oil valve elastic member is connected to the bottom of the push rod through the upper spring seat, the lower end of the staggered oil valve elastic member is connected to the top of the sliding valve assembly through the lower spring seat, and a thrust ball bearing is provided at the connection between the lower spring seat and the sliding valve assembly.

[0011] In one embodiment, the sliding valve assembly includes a sliding valve body and a rotating disk that cooperate with each other, the sliding valve body and the rotating disk are provided with an oil cavity and an oil through hole, and the thrust ball bearing is cooperatively connected to the upper end of the rotating disk.

[0012] In one embodiment, a first needle bearing is provided at the connection between the feedback lever and the feedback plate, a support fork is provided at the end of the adjusting bolt, the adjusting bolt is connected to the connecting rod through an adjusting nut, the indicator pin is fixed to the support fork through a latch, and the scale plate is fixed to the upper end of the connecting rod through a scale plate frame.

[0013] In one embodiment, a sealing ring is provided at the connection between the cylinder cover and the inner wall of the second cavity, a sealing ring is provided at the connection between the piston and the piston rod, and a shaft retaining ring is provided at the connection between the cylinder cover and the piston rod.

[0014] In one possible implementation manner, a second needle roller bearing is provided at the connection between the connecting plate and the guide rail, and the second needle roller bearing is connected to the connecting plate via a threaded pin.

[0015] In one embodiment, a first bushing is provided at the connection between the lower portion of the cylinder cover and the piston rod, the bottom of the piston rod passes through the piston and is fastened by a fastening nut, a distance sleeve is provided below the piston, and the width of the distance sleeve matches the width of the piston.

[0016] In one possible implementation manner, a gas emitter pipe is provided on one side of the oil-steering throttle upper cover.

[0017] In one embodiment, the piston divides the second chamber into an upper chamber and a lower chamber.

[0018] In the present disclosure, since the housing of the oil motor is an integrally formed structure, the complicated steps of assembling multiple components are saved, the production efficiency of the oil motor is improved, and at the same time, oil leakage from the connection between the components after the seal is damaged can be prevented; in addition, since the oil valve includes an inner core, processing and installation are more convenient and reasonable.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0021] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0022] Figure 1 A cross-sectional view of the overall structure of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0023] Figure 2 A side cross-sectional view of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0024] Figure 3 A cross-sectional view of an inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0025] Figure 4 A side cross-sectional view of an inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0026] Figure 5 A cross-sectional view of the inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0027] Figure 6 A BB cross-sectional view of an inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0028] Figure 7 A CC cross-sectional view of an inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0029] Figure 8 A top view of an inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0030] Fig. 9 A D-direction view of the inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown;

[0031] Fig.10 The figure shows an E-direction view of the inner core of an oil motor according to an exemplary embodiment of the present disclosure;

[0032] Fig.11 A F-direction view of an inner core of an oil motor according to an exemplary embodiment of the present disclosure is shown.

[0033] Explanation of the numbers in the figure: 1. Housing; 2. Upper sleeve; 3. Lower sleeve; 4. Inner core; 5. Sliding valve assembly; 6. Throttle upper cover; 7. Throttle elastic member; 8. Push rod; 9. Piston; 10. Piston ring; 11. Piston rod; 12. Cylinder cover; 13. Seal assembly; 14. Guide rail; 15. Feedback lever support; 16. Connecting rod; 18. Connecting plate; 19. Scale plate; 20. Feedback plate; 21. Feedback lever; 22. Indicator pin; 23. Adjusting bolt; 24. Adjusting bolt; 25. Adjusting nut; 26. Upper spring seat; 27. Lower spring seat; 2 8. Thrust ball bearing; 29. ​​First needle roller bearing; 30. Support fork; 31. Adjusting nut; 32. Latch pin; 33. Scale plate frame; 34. Sealing ring; 35. Sealing ring; 36. Shaft retaining ring; 37. Second needle roller bearing; 38. Threaded pin; 39. First bushing; 40. Contour cavity; 41. First through hole; 42. Second through hole; 43. Third through hole; 44. Fourth through hole; 45. Fastening nut; 46. Distance sleeve; 47. Aerator pipe; 48. Upper cavity; 49. Lower cavity; 50. Adjusting screw; 51. Sliding valve body; 52 Rotating disk. DETAILED DESCRIPTION

[0034] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0035] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0036] Reference Figure 1 and Figure 2As shown, an oil motor of an exemplary embodiment of the present disclosure includes a housing 1, a staggered oil valve, an oil cylinder and a feedback mechanism. The housing 1 includes a first cavity and a second cavity, and the housing 1 is an integrally formed structure. The staggered oil valve includes an upper sleeve 2, a lower sleeve 3 and an inner core 4. The inner core 4 is located in the first cavity. The upper sleeve 2 and the lower sleeve 3 are mounted on the inner core 4. A sliding valve assembly 5 is provided between the upper sleeve 2 and the lower sleeve 3. A staggered oil valve upper cover 6 is provided above the sliding valve assembly 5. The staggered oil valve upper cover 6 is connected to the top of the sliding valve assembly 5 through a staggered oil valve elastic member 7 and a push rod 8. The oil cylinder comprises a piston 9, a piston ring 10, a piston rod 11 and a cylinder cover 12. A sealing assembly 13 is provided between the piston rod 11 and the cylinder cover 12. A guide rail 14 and a feedback lever support 15 are provided on the top of the cylinder cover 12. A pull cylinder connected to a lever of a regulating steam valve is provided on the upper end of the piston rod 11. A connecting rod 16 is connected to the regulating steam valve through a spherical bearing. A connecting plate 18 is provided at the connection between the connecting rod 16 and the piston rod 11. One end of the connecting plate 18 is connected to the guide rail 14. The feedback mechanism includes a scale plate 19, a feedback plate 20 and a feedback lever 21. The feedback plate 20 is hinged to the other end of the connecting plate 18. The scale plate 19 is fixed to the top of the connecting rod 16. An indicator pin 22 is fixed to the top of the feedback plate 20. The indicator pin 22 cooperates with the scale plate 19. An adjusting bolt 23 for adjusting the position of the indicator pin 22 is also provided on the upper part of the connecting rod 16. The feedback lever 21 is arranged on the feedback lever support 15. One end of the feedback lever 21 is connected to the feedback plate 20, and the other end is connected to the top rod 8 through an adjusting bolt 24 and an adjusting nut 25.

[0037] Specifically, refer to Figure 3 to Figure 11 As shown, in one embodiment, the inner core 4 has a contoured cavity 40, which is used to load the upper sleeve 2, the sliding valve assembly 5 and the lower sleeve 3. The inner core 4 is also provided with a first through hole 41, a second through hole 42, a third through hole 43 and a fourth through hole 44.

[0038] Further, in one embodiment, the piston 9 divides the second chamber into an upper chamber 48 and a lower chamber 49 .

[0039] In this embodiment, the sealing assembly 13 can be specifically an O-type sealing ring, and the piston 9 is equipped with a special piston ring 10 filled with polytetrafluoroethylene. When the piston 9 moves, there is a damping area of ​​10mm (the 10mm here is not an absolute 10mm, and there can be a slight deviation within the tolerance range) near the top dead center to reduce the inertia force and load force of the piston 9 and reduce its movement speed. The upper sleeve 2, the lower sleeve 3, the inner core 4 and the housing 1 form five oil circuits with different functions, among which the middle one is the power oil inlet, and the two adjacent to the middle one are respectively connected to the upper chamber 48 and the lower chamber 49 of the oil cylinder, and the oil return near the two ends is the oil motor. When working, the flow direction of the oil is controlled by the slide valve assembly 5. The stroke of the oil motor is transmitted to the throttle elastic member 7 through the feedback plate 20 and the feedback lever 21. After the throttle elastic member 7 is compressed, it stabilizes at a certain value, thereby controlling the stroke of the oil motor. Therefore, since the housing 1 of the oil motor is an integrally formed structure, the complicated steps of assembling multiple components are saved, the production efficiency of the oil motor is improved, and at the same time, oil leakage from the connection between the components after the seal is damaged can be prevented; in addition, since the oil valve includes an inner core 4, processing and installation are more convenient and reasonable.

[0040] In one embodiment, the staggered valve further includes an upper spring seat 26 and a lower spring seat 27. The upper end of the staggered valve elastic member 7 is connected to the bottom of the push rod 8 through the upper spring seat 26, and the lower end of the staggered valve elastic member 7 is connected to the top of the sliding valve assembly 5 through the lower spring seat 27. A thrust ball bearing 28 is provided at the connection between the lower spring seat 27 and the sliding valve assembly 5.

[0041] In this embodiment, by providing the upper spring seat 26 and the lower spring seat 27 , the slide valve assembly 5 can push the throttle elastic member 7 and the ejector pin more stably and reliably.

[0042] In one embodiment, the sliding valve assembly 5 includes a sliding valve body 51 and a rotating disk 52 that cooperate with each other. The sliding valve body 51 and the rotating disk 52 are provided with oil chambers and oil holes. The thrust ball bearing 28 is connected to the upper end of the rotating disk 52 in a cooperative manner.

[0043] In one embodiment, a first needle bearing 29 is provided at the connection between the feedback lever 21 and the feedback plate 20, a support fork 30 is provided at the end of the adjusting bolt 23, the adjusting bolt 23 is connected to the connecting rod 16 through an adjusting nut 31, the indicator pin 22 is fixed to the support fork 30 through a latch pin 32, and the scale plate 19 is fixed to the upper end of the connecting rod 16 through a scale plate frame 33.

[0044] In this embodiment, by providing the sliding valve body 51 and the rotating disk 52, the lifting force of the sliding valve assembly 5 is increased, and it can respond to the steam valve control signal more sensitively, the transmission of the feedback lever 21 and the feedback plate 20 is more stable and reliable, the matching of the adjusting bolt 23 and the indicating pin 22 is more stable and firm, and the installation of the scale plate 19 is also more firm. Under stable working conditions, the secondary oil force at the lower end of the sliding valve body 51 is balanced with the force of the throttle elastic member 7 at the upper end, so that the sliding valve body 51 is in the middle position, and the convex shoulder of the sliding valve body 51 just seals the oil port of the sleeve, and the inlet and outlet oil paths of the oil cylinder are blocked, so the piston 9 of the oil cylinder does not move, and the steam valve opening remains unchanged; if the working conditions change, for example, due to the reduction of the running speed of the unit, the secondary oil pressure increases, the force balance of the sliding valve body 51 changes, so that the sliding valve body 51 moves upward, so that when the oil port of the power oil to the upper chamber 48 of the oil cylinder is opened, the lower The chamber 49 is connected to the return oil. Since the upper chamber 48 is filled with oil and the lower chamber 49 is discharged, the piston 9 moves downward, increasing the opening of the regulating steam valve, increasing the steam flow entering the steam turbine, and increasing the speed of the unit. At the same time, as the piston 9 moves downward, the corresponding actions of the feedback plate 20, the feedback lever 21 and the ejector pin increase the workload of the oil-steering valve elastic member 7. When the secondary oil pressure acting on the slide valve body 51 reaches a new balance with the oil-steering valve elastic member 7, the slide valve body 51 returns to the middle position, and the corresponding steam valve opening stops at the new position. The unit thus operates stably under the new working condition. It can be understood that the situation in which the working condition changes in the present disclosure is only taken as an example when the secondary oil pressure increases. If the secondary oil pressure decreases, the actions of each link are opposite to the above process, and no further details will be given here.

[0045] In the present embodiment, along with the rotation of the sliding valve body 51, the sliding valve body 51 also generates up and down vibration. This is because every time the sliding valve body 51 rotates one turn, a radial oil drain hole in the lower part of the sliding valve body 51 communicates with the oil leakage hole once. At the same moment, due to the partial secondary oil leakage, the secondary oil pressure drops slightly, causing the sliding valve body 51 to move downward, and when the oil drain hole is sealed as the sliding valve body 51 rotates, the sliding valve body 51 moves up again. As long as the sliding valve body 51 rotates, the above action is repeated, and the regular pulsation of the secondary oil pressure causes the sliding valve body 51 to vibrate, and the vibration of the sliding valve body 51 causes the oil motor piston 9 and the regulating steam valve stem to oscillate slightly, so that the oil motor can sensitively respond to the control signal of the regulating system. Among them, the amplitude of the sliding valve body 51 can be adjusted by the adjusting screw 50, and the amplitude is indirectly measured by the amplitude of the piston rod 11 of the oil cylinder. The amplitude of the piston rod 11 is usually controlled at 0.2mm-0.3mm, and the maximum is 0.5mm (the 0.2mm, 0.3mm and 0.5mm here are not absolute 0.2mm, 0.3mm and 0.5mm, and there can be a slight deviation within the tolerance range). The corresponding relationship between the secondary oil pressure and the stroke of the piston rod 11 of the oil cylinder can be corrected by changing the installation angle of the feedback plate 20 by using the adjusting bolt 23 on the connecting rod 16. It can be understood that the change of the installation angle of the feedback plate 20 will inevitably change the initial value of the action of the piston 9. The secondary oil pressure value when the piston 9 starts to move is usually adjusted by the adjusting bolt 24 at the top of the throttle.

[0046] In one embodiment, a sealing ring 34 is provided at the connection between the cylinder cover 12 and the inner wall of the second cavity, a sealing ring 35 is provided at the connection between the piston 9 and the piston rod 11, and a shaft retaining ring 36 is provided at the connection between the cylinder cover 12 and the piston rod 11.

[0047] In this embodiment, by arranging corresponding sealing members at the above-mentioned positions, the sealing performance can be ensured, resulting in a better sealing effect.

[0048] In one embodiment, a second needle roller bearing 37 is provided at the connection between the connecting plate 18 and the guide rail 14 , and the second needle roller bearing 37 is connected to the connecting plate 18 via a threaded pin 38 .

[0049] In one embodiment, a first bushing 39 is provided at the connection between the lower part of the cylinder cover 12 and the piston rod 11. The bottom of the piston rod 11 passes through the piston 9 and is fastened by a fastening nut 45. A spacing sleeve 46 is provided below the piston 9, and the width of the spacing sleeve 46 matches the width of the piston 9.

[0050] In this embodiment, the connection between the cylinder cover 12 and the piston rod 11 is more stable and reliable, so that the arrangement of the piston 9 has a supporting structure.

[0051] In one embodiment, a gas vent pipe 47 is provided on one side of the oil throttle upper cover 6, so as to ensure gas venting of the oil motor.

[0052] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by the directional words is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that spatially relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein.

[0056] The present disclosure has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present disclosure to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present disclosure is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present disclosure, and these variations and modifications all fall within the scope of protection claimed by the present disclosure. The scope of protection of the present disclosure is defined by the attached claims and their equivalents.

Claims

1. An oil motor, characterized in that: include: A housing (1) comprises a first cavity and a second cavity, wherein the housing (1) is an integrally formed structure; A staggered oil valve comprises an upper sleeve (2), a lower sleeve (3) and an inner core (4), wherein the inner core (4) is located in the first cavity, the upper sleeve (2) and the lower sleeve (3) are mounted on the inner core (4), a sliding valve assembly (5) is provided between the upper sleeve (2) and the lower sleeve (3), an staggered oil valve upper cover (6) is provided above the sliding valve assembly (5), and the staggered oil valve upper cover (6) is connected to the top of the sliding valve assembly (5) via a staggered oil valve elastic member (7) and a push rod (8); An oil cylinder comprises a piston (9), a piston ring (10), a piston rod (11) and an oil cylinder cover (12); a sealing assembly (13) is provided between the piston rod (11) and the oil cylinder cover (12); a guide rail (14) and a feedback lever support (15) are provided on the top of the oil cylinder cover (12); a connecting rod (16) connected to a regulating steam valve lever is provided on the upper end of the piston rod (11); the connecting rod (16) is connected to the regulating steam valve via a spherical bearing; a connecting plate (18) is provided at the connection between the connecting rod (16) and the piston rod (11); one end of the connecting plate (18) is connected to the guide rail (14); A feedback mechanism comprises a scale plate (19), a feedback plate (20) and a feedback lever (21), wherein the feedback plate (20) is hinged to the other end of the connecting plate (18), the scale plate (19) is fixed to the top of the connecting rod (16), an indicator pin (22) is fixed to the top of the feedback plate (20), the indicator pin (22) cooperates with the scale plate (19), an adjusting bolt (23) for adjusting the position of the indicator pin (22) is also provided on the upper part of the connecting rod (16), the feedback lever (21) is arranged on the feedback lever support (15), one end of the feedback lever (21) is connected to the feedback plate (20), and the other end is connected to the push rod (8) through an adjusting bolt (24) and an adjusting nut (25).

2. The oil motor according to claim 1, characterized in that: The inner core (4) has a contoured cavity (40) for loading an upper sleeve (2), a sliding valve assembly (5) and a lower sleeve (3). The inner core (4) is provided with a first through hole (41), a second through hole (42), a third through hole (43) and a fourth through hole (44).

3. The oil motor according to claim 1, characterized in that: The oil-steering valve further comprises an upper spring seat (26) and a lower spring seat (27); the upper end of the oil-steering valve elastic member (7) is connected to the bottom of the push rod (8) via the upper spring seat (26); the lower end of the oil-steering valve elastic member (7) is connected to the top of the slide valve assembly (5) via the lower spring seat (27); and a thrust ball bearing (28) is provided at the connection between the lower spring seat (27) and the slide valve assembly (5).

4. The oil motor according to claim 3, characterized in that: The slide valve assembly (5) comprises a slide valve body (51) and a rotating disk (52) which cooperate with each other. The slide valve body (51) and the rotating disk (52) are provided with an oil cavity and an oil hole. The thrust ball bearing (28) is cooperatively connected to the upper end of the rotating disk (52).

5. The oil motor according to claim 1, characterized in that: A first needle bearing (29) is provided at the connection between the feedback lever (21) and the feedback plate (20); a support fork (30) is provided at the end of the adjusting bolt (23); the adjusting bolt (23) is connected to the connecting rod (16) via an adjusting nut (31); the indicating pin (22) is fixed to the support fork (30) via a latch (32); and the scale plate (19) is fixed to the upper end of the connecting rod (16) via a scale plate frame (33).

6. The oil motor according to claim 1, characterized in that: A sealing ring (34) is provided at the connection between the cylinder cover (12) and the inner wall of the second cavity, a sealing ring (35) is provided at the connection between the piston (9) and the piston rod (11), and a shaft retaining ring (36) is provided at the connection between the cylinder cover (12) and the piston rod (11).

7. The oil motor according to claim 1, characterized in that: A second needle roller bearing (37) is provided at the connection point between the connecting plate and the guide rail (14), and the second needle roller bearing (37) is connected to the connecting plate via a threaded pin (38).

8. The oil motor according to claim 1, characterized in that: A first bushing (39) is provided at the connection between the lower part of the cylinder cover (12) and the piston rod (11); the bottom of the piston rod (11) passes through the piston (9) and is fastened by a fastening nut (45); a spacing sleeve (46) is provided below the piston (9); the width of the spacing sleeve (46) matches the width of the piston (9).

9. The oil motor according to claim 1, characterized in that: A gas vent pipe (47) is provided on one side of the oil throttle upper cover (6).

10. The oil motor according to claim 1, characterized in that: The piston (9) divides the second chamber into an upper chamber (48) and a lower chamber (49).

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