Axial thrust anti-slip mechanism

Abstract

This invention provides an axial thrust anti-runaway mechanism for testing applications. It includes a fixed base, an adjusting screw assembly, and a rotor end support block. The fixed base is used for fixing and resisting thrust in the axial thrust anti-runaway mechanism. The fixed base is connected and fixed to the axial thrust anti-runaway air foot via the adjusting screw assembly. The rotor end support block is connected and fixed to the engine rotor. An encoder is installed on the axial thrust anti-runaway air foot for displaying and monitoring the angle during rotor rotation. A miniature sensor is installed at the center of the axial thrust anti-runaway air foot to monitor and verify the axial runaway value during rotor rotation in real time. When energized, the axial thrust anti-runaway air foot limits the rotor's axial runaway. The adjusting screw assembly is used to axially stop the rotor under the premise of fine-tuning the angle of the axial thrust anti-runaway mechanism. This invention allows the rotor to both rotate and be axially stopped. Rotating the rotor allows simultaneous viewing of the rotor rotation angle and axial runaway value, achieving both axial stopping and measurement of the rotor.

Description

Technical Field

[0001] The invention belongs to the field of testing, relates to the rotation measurement of a rotor, and relates to an axial thrust anti-slip mechanism. Background Art

[0002] The structure of a certain type of engine is significantly different from that of existing engines. In terms of design concept, the assembly process is used as a key measure to control the quality of the engine. A large number of parameters must be guaranteed during the assembly process, especially the rotor assembly process, which requires online measurement and adjustment of the rotor's end face runout and cylindrical runout to ensure the assembly quality of the rotor. Different from the previous rotor runout measurement requirements, the rotor runout measurement benchmark of this type of engine is the double cylinder with a large span at both ends of its journal. The technical conditions and capabilities of the existing rotor runout measurement system, tooling equipment, etc. cannot meet the rotor structure of this type of engine with a large span of double cylinders supporting and positioning at the front and rear.

[0003] The existing vertical rotor measurement method is not suitable for the measurement needs of the rotor of this model of engine. If the horizontal measurement is supported by a dynamic balancing machine, the problem is that the axial positioning during measurement only relies on one end face clamping wheel. During the experiment, it was found that the measured part and the clamping wheel were obviously separated and unstable during rotation, and there was randomness. Under the premise that axial thrust cannot be guaranteed, the end face runout measurement of the rotor is meaningless. In addition, under this measurement method, the angle information cannot be automatically collected and can only rely on manual marking, and the measurement efficiency is extremely low. Summary of the invention

[0004] The problem to be solved by the present invention is to provide an axial thrust and anti-slip mechanism, which can be both rotated and axially stopped. By rotating the rotor, the rotor rotation angle and axial slip value can be checked at the same time, thereby realizing the axial stopping and measurement of the rotor.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an axial thrust anti-collision mechanism, comprising a fixing seat, an adjusting screw assembly and a rotor end support block, the fixing seat is used for fixing and thrusting the axial thrust anti-collision mechanism, the fixing seat is connected and fixed with the axial thrust air foot through the adjusting screw assembly, and the rotor end support block is connected and fixed with the engine rotor;

[0006] An encoder is installed on the axial thrust gas foot, and an encoder sensing magnetic ring is installed on the rotor end support block. The encoder is used to display and monitor the angle of the rotor when it is rotating. A micro sensor is installed at the center of the axial thrust gas foot to monitor and verify the axial movement value of the rotor when it is rotating in real time.

[0007] The outer ring of the axial thrust air foot is inlaid with an electromagnet, and the outer ring of the rotor end support block is inlaid with an iron ring. After the axial thrust air foot is supplied with air and the electromagnet is powered, the axial thrust air foot automatically enters a preloaded air floating state after contacting the rotor end support block, which is used to limit the axial anti-collision of the rotor; after the electromagnet is powered off and unloaded, the axial thrust air foot is separated from the rotor end support block.

[0008] The adjusting screw assembly is used for axial stopping under the premise of fine adjustment of the angle of the axial thrust and anti-collision mechanism.

[0009] Furthermore, the magnetic ring is arranged in the fixed sleeve, the fixed sleeve is embedded in the rotor end support block, the fixed sleeve is an annular groove structure, the inner ring of the fixed sleeve is provided with a magnetic isolation aluminum ring and the two are coaxially arranged, the magnetic ring sleeve is arranged in the magnetic isolation aluminum ring, forming a double-layer magnetic isolation structure.

[0010] Furthermore, a guide column is provided in the rotor end support block, the middle hole of the fixing sleeve is matched with the guide column, the fixing sleeve is flush with the end face of the magnetic isolation aluminum ring and is not higher than the end face of the rotor end support block, and the end face of the magnetic ring is not higher than the end face of the fixing sleeve.

[0011] Furthermore, the axial thrust gas foot is a hollow structure, the encoder is arranged in the middle of the axial thrust gas foot and the two are coaxially arranged, the encoder is a hollow structure, the micro sensor is arranged inside the encoder and the two are coaxially arranged.

[0012] Furthermore, a wire outlet hole is provided on one side of the axial thrust gas foot close to the adjusting screw assembly, and a signal line of the micro sensor is led out through the wire outlet hole.

[0013] Furthermore, the plurality of electromagnets are evenly distributed relative to the axis of the axial thrust gas foot, the iron ring is axially fixed by a shoulder structure on the rotor end support block, the end face of the iron ring is flush with the end face of the rotor end support block, and the electromagnets and the iron rings are correspondingly arranged.

[0014] Furthermore, the adjusting screw assembly includes a ball screw, one end of the ball screw is a spherical part, and the other end is a threaded rod, the diameter of the spherical part is larger than the diameter of the threaded rod; a ball socket ring is arranged in cooperation with the spherical part, the part of the spherical part away from the threaded rod is gap-matched with the ball socket ring, and the ball socket ring is fitted with the rotor installed with the tooling through an axial thrust gas foot; it also includes an anti-slip ring, which limits the spherical part so that the spherical part and the ball socket ring do not separate; the threaded rod is installed on a fixed seat, and the fixed seat is fixed and stationary, so as to achieve axial stopping under the premise of fine-tuning the angle.

[0015] Furthermore, an adjustment ring is provided between the ball and socket ring and the anti-slip ring, the adjustment ring is arranged without contact with the spherical portion, and the adjustment ring includes specifications of various thicknesses.

[0016] Furthermore, a avoidance hole is provided on one side of the ball and socket ring close to the spherical part, a gap is provided between the spherical part and the avoidance hole, and a regular polygonal connecting hole is provided on one end of the threaded rod away from the spherical part for placing the end of a wrench during assembly.

[0017] Furthermore, a matching adjusting nut is provided on the threaded rod, and the axial length of the ball screw can be adjusted by changing the position of the adjusting nut relative to the threaded rod. A locking nut is provided at the end of the adjusting nut away from the fixing seat to lock the ball screw.

[0018] Compared with the prior art, the present invention has the following advantages and positive effects.

[0019] 1. The present invention is used for axial thrust during horizontal rotor runout measurement, ensuring the accuracy and effectiveness of rotor runout measurement, solving the problem of no reliable axial positioning and inaccurate end face runout measurement during horizontal rotor runout measurement, while ensuring stable rotation of the measured part during axial thrust.

[0020] 2. The present invention fits the axial surfaces of the axial thrust gas foot and the rotor end support block together, and at the same time, energizes and air is supplied to the axial thrust gas foot to form an air film between the two fitting surfaces, so that the rotor can be rotated and axially stopped. By rotating the rotor, the rotor rotation angle and axial movement value can be checked at the same time, so as to achieve axial stopping and measurement of the rotor. After the rotor measurement is completed, the axial thrust gas foot is powered off and air is cut off, and the rotor can be directly removed. In addition, according to the different end surface interfaces of the engine rotor, multiple sets of rotor end support blocks are provided to make it universal.

[0021] 3. The adjusting screw assembly in the present invention is suitable for measuring the rotation of the rotor. On the basis of thrust, the angle can be fine-tuned to prevent the rotor from struggling during rotation, ensuring that the axial position is absolutely fixed during measurement. At the same time, the center coincides with the center of the workpiece. Even if there is a skew tolerance on the rotor positioning end face, the thrust direction remains unchanged. The structure is simple, which avoids the discovery of torque during the rotor test and ensures the accuracy of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 is a cross-sectional view of the axial thrust and anti-slip mechanism of the present invention;

[0024] Figure 2It is an enlarged view of part B of the diagram of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the axial thrust anti-slip mechanism of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the axial thrust gas foot of the present invention from the left side;

[0027] Figure 5 It is a schematic structural diagram of the axial thrust gas foot of the present invention from the right side;

[0028] Figure 6 It is a schematic diagram of the structure of the rotor end support block of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the fixing sleeve of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the adjusting screw assembly of the present invention;

[0031] Fig. 9 It is a partial cross-sectional view of the application state of the adjusting screw assembly of the present invention;

[0032] Fig.10 The present invention Fig. 9 Detail of Part A.

[0033] Reference numerals:

[0034] 1. Ball and socket ring; 11. Avoidance hole; 12. Positioning hole; 2. Adjustment ring; 3. Anti-slip ring; 4. Ball screw; 41. Spherical part; 42. Threaded rod; 43. Connecting hole; 5. Adjustment nut; 6. Lock nut; 7. Fixed seat; 8. Axial thrust foot; 81. Appearance hole; 82. Locking boss; 83. Mounting hole; 9. Rotor end support block; 91. Iron ring; 92. Guide column; 20. Encoder; 30. Micro sensor; 40. Magnetic ring; 50. Magnetic isolation aluminum ring; 60. Fixed sleeve. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] like Figure 1 to Figure 7 As shown, the present invention is an axial thrust stop and anti-collision mechanism, comprising a fixing seat 7, an adjusting screw assembly and a rotor end support block 9, wherein the fixing seat 7 is used for fixing and thrust stop of the axial thrust stop and anti-collision mechanism, the fixing seat 7 is connected and fixed with the axial thrust stop gas foot 8 through the adjusting screw assembly, and the rotor end support block 9 is connected and fixed with the engine rotor;

[0040] An encoder 20 is installed on the axial thrust gas foot 8, and a magnetic ring 40 for sensing the encoder 20 is installed on the rotor end support block 9. The encoder 20 is used to display and monitor the angle of the rotor when it rotates. A micro sensor 30 is installed at the center position inside the axial thrust gas foot 8 to monitor and verify the axial movement value of the rotor when it rotates in real time.

[0041] The outer ring of the axial thrust gas foot 8 is inlaid with an electromagnet, and the outer ring of the rotor end support block 9 is inlaid with an iron ring 91. After the axial thrust gas foot 8 is supplied with air and the electromagnet is powered, the axial thrust gas foot 8 is automatically in a preloaded air floating state after contacting the rotor end support block 9, which is used to limit the axial anti-collision of the rotor; after the electromagnet is powered off and unloaded, the axial thrust gas foot 8 is separated from the rotor end support block 9.

[0042] The adjusting screw assembly is used for axial stopping under the premise of fine adjustment of the angle of the axial thrust and anti-collision mechanism.

[0043] Preferably, the magnetic ring 40 is arranged in a fixed sleeve 60, and the fixed sleeve 60 is embedded in the rotor end support block 9. The fixed sleeve 60 is an annular groove structure. The inner ring of the fixed sleeve 60 is provided with a magnetic isolation aluminum ring 50 and the two are coaxially arranged. The magnetic ring 40 is sleeved in the magnetic isolation aluminum ring 50 to form a double-layer magnetic isolation structure to ensure the accuracy of the encoder 20.

[0044] Preferably, a guide column 92 is provided in the rotor end support block 9, and the middle hole of the fixing sleeve 60 is matched with the guide column 92 for convenient and quick installation and fixation. The fixing sleeve 60 is flush with the end face of the magnetic isolation aluminum ring 50 and does not exceed the end face of the rotor end support block 9. The end face of the magnetic ring 40 is not higher than the end face of the fixing sleeve 60, which is beautiful and convenient for quick alignment and assembly.

[0045] Preferably, the axial thrust gas foot 8 is a hollow structure, and the inner ring of the axial thrust gas foot 8 is provided with a plurality of evenly distributed locking bosses 82 for installing and fixing the encoder 20. The encoder 20 is arranged in the middle of the axial thrust gas foot 8 and the two are coaxially arranged. The encoder 20 is a hollow structure, and the micro sensor 30 is arranged inside the encoder 20 and the two are coaxially arranged. Preferably, the axial thrust gas foot 8 is provided with a wire outlet hole on the side close to the adjusting screw assembly, and the signal line of the micro sensor 30 is led out through the wire outlet hole. This hollow coaxial circular structure makes the entire structure compact and occupies little space, reduces the space of the entire mechanism, reduces the specifications of each part, reduces the cost, and facilitates inventory and assembly.

[0046] Preferably, a plurality of mounting holes 83 are evenly distributed circumferentially on one side of the axial thrust gas foot 8 close to the rotor end support block 9, and an electromagnet is placed in one mounting hole 83 with clearance fit. The plurality of electromagnets are evenly distributed relative to the axis of the axial thrust gas foot 8, and the iron ring 91 is axially fixed by the shoulder structure on the rotor end support block 9. The end face of the iron ring 91 is flush with the end face of the rotor end support block 9. The electromagnet and the iron ring 91 are correspondingly arranged, with a simple structure and convenient and quick installation.

[0047] like Figure 8-Figure 10 As shown, the adjusting screw assembly includes a ball screw 4, one end of the ball screw 4 is a spherical portion 41, and the other end is a threaded rod 42. The diameter of the spherical portion 41 is larger than the diameter of the threaded rod 42, which facilitates the fixing of the spherical portion 41;

[0048] A socket ring 1 is provided in cooperation with the spherical part 41. The part of the spherical part 41 away from the threaded rod 42 is loosely matched with the socket ring 1. The socket ring 1 is fitted with a rotor end support block 9 installed with a tooling through an axial thrust gas foot 8. The axial thrust gas foot 8 is a key component for providing air bearing support for the precision motion table to ensure that the motion table can perform frictionless motion on a platform (generally a marble platform). In the present application, the frictionless motion of the socket ring 1 relative to the rotor end support block 9 tooling is realized, and an anti-slip ring 3 is also included to limit the spherical part 41 so that the spherical part 41 does not separate from the socket ring 1.

[0049] The threaded rod 42 is mounted on the fixing seat 7, and the fixing seat 7 is fixed so as to achieve axial stop under the premise of fine adjustment of the angle.

[0050] Preferably, an adjustment ring 2 is provided between the ball and socket ring 1 and the anti-slip ring 3. The adjustment ring 2 is arranged without contact with the spherical portion 41. The adjustment ring 2 includes specifications of various thicknesses, and the axial length of the adjusting screw can be adjusted to compensate for processing errors and improve assembly efficiency.

[0051] Preferably, a avoidance hole 11 is provided on one side of the ball and socket ring 1 close to the spherical portion 41, and a gap is provided between the spherical portion 41 and the avoidance hole 11 to avoid excessive contact of the unsupported part and reduce the processing accuracy of the parts. Since the mating parts are all ground and the processing cost is high, reducing the processing surface can reduce the processing cost.

[0052] Preferably, the number of the axial thrust gas foot 8 is at least one. When there is one, it is centrally arranged relative to the ball and socket ring 1. Positions of the ball and socket ring 1 corresponding to the axial thrust gas foot 8 are provided with positioning holes 12 to achieve rapid positioning.

[0053] Preferably, there are multiple axial thrust gas feet 8, and the multiple axial thrust gas feet 8 are evenly distributed relative to the axis of the ball and socket ring 1 to ensure balanced force.

[0054] Preferably, a regular polygonal connecting hole 43 is provided at one end of the threaded rod 42 away from the spherical portion 41 for placing the end of a wrench during assembly, so as to quickly position and fit the hole and improve assembly efficiency.

[0055] Preferably, a matching adjusting nut 5 is provided on the threaded rod 42, and the axial length adjustment of the ball screw 4 is achieved by changing the position of the adjusting nut 5 relative to the threaded rod 42. A locking nut 6 is provided at one end of the adjusting nut 5 close to the fixing seat 7 to lock the ball screw 4.

[0056] The application process of the adjusting screw assembly is: by adjusting the ball socket ring 1, the adjusting ring 2 and the anti-slip block, the ball head screw 4 can be slightly moved in the angular direction and the axial movement of the screw can be limited at the same time, and then the axial distance is adjusted by the ball rod nut. After the adjustment, the ball rod lock nut 6 is locked to realize the stop measurement of the rotor 9. This angular axial thrust mechanism is suitable for the rotation measurement of the rotor 9. On the basis of thrust, the angle can be fine-tuned to prevent the rotor 9 from struggling when rotating, and the axial position is absolutely fixed during measurement. At the same time, the center and the workpiece center coincide. Even if the positioning end face of the rotor 9 has a skew tolerance, the thrust direction remains unchanged.

[0057] When the axial thrust stop and anti-runaway mechanism is used, it is suitable for the axial thrust stop and anti-runaway of the rotor rotation measurement, ensuring that the axial position is absolutely fixed during measurement to avoid damage to the machine parts and affect the engine performance. The axial thrust stop gas foot 8 is fixed on the fixing seat 7 by adjusting the screw assembly to make it immovable; the rotor end support block 9 is connected and fixed to the engine rotor to form a whole, and the axial thrust stop gas foot 8 and the two axial surfaces of the rotor end support are fitted together. After the electromagnet is magnetized, the two surfaces are adsorbed and fixed, and the axial fitting surface of the axial thrust stop gas foot 8 is ventilated to form an air film between the two surfaces. At this time, the rotor can both rotate and realize the thrust stop function, eliminating the risk of the rotor detaching from the support shaft, and through the micro sensor 30 and the encoder 20, the axial runout value is monitored and the angle is measured and monitored at the same time, realizing high-precision measurement of the rotor and providing measurement speed and efficiency.

[0058] When the whole mechanism is used, the rotor end support block 9 must first be connected and fixed to the engine rotor to form a whole, and then the rotor must be installed on the measuring platform. Then, the axial surfaces of the axial thrust gas foot 8 and the rotor end support block 9 must be fitted together, and at the same time, the axial thrust gas foot 8 must be powered and aired to form an air film between the two fitting surfaces, so that the rotor can be rotated and axially stopped. By rotating the rotor, the rotor rotation angle and axial movement value can be checked at the same time, so that the axial stopping and measurement of the rotor can be achieved. After the rotor measurement is completed, the axial thrust gas foot 8 is powered off and air is cut off, and the rotor can be directly removed. In addition, according to the different end surface interfaces of the engine rotor, multiple sets of rotor end support blocks 9 are provided to make it universal.

[0059] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. Axial thrust anti-slip mechanism, characterized by: It includes a fixing seat, an adjusting screw assembly and a rotor end support block, wherein the fixing seat is used for fixing and thrusting the axial thrust anti-collision mechanism, the fixing seat is connected and fixed with the axial thrust air foot through the adjusting screw assembly, and the rotor end support block is connected and fixed with the engine rotor; An encoder is installed on the axial thrust gas foot, and an encoder sensing magnetic ring is installed on the rotor end support block. The encoder is used to display and monitor the angle of the rotor when it is rotating. A micro sensor is installed at the center of the axial thrust gas foot to monitor and verify the axial movement value of the rotor when it is rotating in real time. The outer ring of the axial thrust gas foot is inlaid with an electromagnet, and the outer ring of the rotor end support block is inlaid with an iron ring. After the axial thrust gas foot is supplied with air and the electromagnet is powered, the axial thrust gas foot automatically enters a preloaded air floating state after contacting the rotor end support block, which is used to limit the axial anti-collision of the rotor; after the electromagnet is powered off and unloaded, the axial thrust gas foot is separated from the rotor end support block; An adjusting screw assembly is used for axial stopping under the premise of fine adjustment of the angle of the axial thrust and anti-collision mechanism; The magnetic ring is arranged in the fixed sleeve, and the fixed sleeve is embedded in the support block at the end of the rotor. The fixed sleeve is an annular groove structure. The inner ring of the fixed sleeve is provided with a magnetic isolation aluminum ring and the two are coaxially arranged. The magnetic ring sleeve is arranged in the magnetic isolation aluminum ring to form a double-layer magnetic isolation structure. The axial thrust gas foot is a hollow structure, the encoder is arranged in the middle of the axial thrust gas foot and the two are coaxially arranged, the encoder is a hollow structure, the micro sensor is arranged inside the encoder and the two are coaxially arranged; The adjusting screw assembly includes a ball screw, one end of which is a spherical part and the other end is a threaded rod, the diameter of the spherical part is larger than the diameter of the threaded rod; a socket ring is arranged in cooperation with the spherical part, the part of the spherical part away from the threaded rod is gap-matched with the socket ring, and the socket ring is fitted with a rotor installed with a tooling through an axial thrust gas foot; an anti-slip ring is also included to limit the spherical part so that the spherical part and the socket ring are not separated; the threaded rod is installed on a fixed seat, and the fixed seat is fixed and motionless, so as to achieve axial stopping under the premise of fine-tuning the angle.

2. The axial thrust prevention mechanism according to claim 1, characterized in that: A guide column is provided in the rotor end support block, the middle hole of the fixing sleeve is matched with the guide column, the fixing sleeve is flush with the end face of the magnetic isolation aluminum ring and is not higher than the end face of the rotor end support block, and the end face of the magnetic ring is not higher than the end face of the fixing sleeve.

3. The axial thrust prevention mechanism according to claim 2, characterized in that: A wire outlet hole is provided on one side of the axial thrust gas foot close to the adjusting screw assembly, and a signal line of the micro sensor is led out through the wire outlet hole.

4. The axial thrust prevention mechanism according to any one of claims 1 to 3, characterized in that: The plurality of electromagnets are evenly distributed relative to the axis of the axial thrust gas foot, the iron ring is axially fixed by the shoulder structure on the rotor end support block, the end face of the iron ring is flush with the end face of the rotor end support block, and the electromagnets and the iron ring are correspondingly arranged.

5. The axial thrust prevention mechanism according to claim 1, characterized in that: An adjustment ring is arranged between the ball and socket ring and the anti-slip ring. The adjustment ring is arranged without contact with the spherical part. The adjustment ring includes specifications of various thicknesses.

6. The axial thrust prevention mechanism according to claim 1, characterized in that: A relief hole is provided on one side of the ball and socket ring close to the spherical part, a gap is provided between the spherical part and the relief hole, and a regular polygonal connecting hole is provided on one end of the threaded rod away from the spherical part for placing the end of a wrench during assembly.

7. The axial thrust prevention mechanism according to claim 1, characterized in that: The threaded rod is provided with a matching adjusting nut, and the axial length adjustment of the ball screw is achieved by changing the position of the adjusting nut relative to the threaded rod. A locking nut is provided at one end of the adjusting nut away from the fixing seat to lock the ball screw.

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