A chamfering mechanism for fixing holes of a servo motor end cover

Abstract

This invention relates to the technical field of motor processing, and in particular to a chamfering mechanism for a servo motor end cap fixing hole, comprising a main sleeve and a secondary shaft slidably inserted within the main sleeve. The secondary shaft has a first long groove and a second long groove along its axial direction, and the projections of the first long groove and the second long groove on a plane perpendicular to the axis of the secondary shaft are perpendicular to each other. Two notches are formed at one end of the main sleeve. By employing two tools to simultaneously chamfer both ends of the fixing hole, the operation method can be effectively simplified, convenience improved, and the tedious operation of frequently disassembling and assembling the end cap avoided. Furthermore, the chamfering axes of the two tools can be ensured to be coaxial, improving processing accuracy. The tool's ability to rotate within the second long groove allows for easy insertion and release of the tool, thus facilitating the tool's passage through the fixing hole.

Description

Technical Field

[0001] This invention relates to the technical field of motor processing, and in particular to a chamfering mechanism for the fixing hole of a servo motor end cover. Background Technology

[0002] Servo motors, as core power components, are increasingly widely used in fields such as intelligent manufacturing, robotics, and new energy vehicles. The servo motor end cap is a key structural component used to seal the stator and support the rotor. The processing quality of its fixing holes directly affects the motor assembly accuracy, sealing performance, operational reliability, and rotor eccentricity. During the end cap manufacturing process, the chamfering treatment of the fixing holes is an important process to ensure the strength of the hole wall, avoid stress concentration, and prevent damage to the seals.

[0003] Since both ends of the fixing hole need to be chamfered, the process involves first fixing the end cap, then manually or automatically chamfering one side of the fixing hole with a cutting tool. After that, the end cap is removed and the direction is reversed, and the other side of the fixing hole is chamfered. This process is cumbersome, requires frequent removal and installation of the end cap, and the position of the end cap is prone to deviation when it is repeatedly fixed, resulting in the axes of the chamfered positions on both sides of the fixing hole not coinciding, which affects the processing quality. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a chamfering mechanism for the fixing hole of a servo motor end cover, the specific technical solution of which is as follows:

[0005] A chamfering mechanism for a servo motor end cap fixing hole according to the present invention includes a main sleeve and a secondary shaft slidably inserted within the main sleeve. The secondary shaft has a first long groove and a second long groove along its axial direction, and the projections of the first long groove and the second long groove on a plane perpendicular to the axial direction of the secondary shaft are perpendicular to each other. One end of the main sleeve has two notches, both of which correspond to the second long groove. Two opposing cutting tools are disposed within the second long groove, each tool having a support shaft. The support shaft on one cutting tool is rotatably mounted on the secondary shaft, while the support shaft on the other cutting tool passes through the first long groove and is rotatably mounted on the main sleeve.

[0006] Furthermore, the cutting tool consists of a support platform located in the middle and two chamfering blades installed on both sides of the support platform, and the distance between the two chamfering blades can be adjusted.

[0007] Furthermore, the cutting edge shape of each of the chamfering knives is set as an arc-shaped cutting edge, and the arc-shaped cutting edge is inclined toward the rotation direction of the knife.

[0008] Furthermore, the chamfering blade has multiple rows of ribs arranged on its sidewall, the multiple rows of ribs being arranged along the width direction of the chamfering blade, and each row of ribs being arranged along the length direction of the chamfering blade;

[0009] The support platform has a through groove along the vertical line connecting the two chamfering blades on it. The chamfering blades are inserted into the through groove. Multiple rows of ribs II are arranged on the inner side wall of the through groove. Multiple rows of ribs II are arranged in correspondence with multiple rows of ribs I. Ribs I are used to fit into the gap between two adjacent ribs II. An adjustment area is set between two adjacent rows of ribs II. The adjustment area is used to provide a channel for adjusting the position of ribs I.

[0010] The opening of the through groove faces between the two cutting tools. A retaining plate is provided at the opening of the through groove. The retaining plate is slidably mounted on the support platform along the direction perpendicular to the opening of the through groove, and the retaining plate is connected to the support platform by an elastic body. The width direction of the chamfering tool is parallel to the opening direction of the through groove.

[0011] Furthermore, the two buckle plates are rotatably connected by two parallel telescopic rods, and the fixed or movable ends of the two telescopic rods are rotatably connected by a connecting rod.

[0012] Furthermore, a boss is provided on the outer wall of the main sleeve, and a moving rod is slidably provided on the boss along the axial direction of the main sleeve. A transmission wheel is driven on the moving rod, and the transmission wheel is connected to the support shaft on the main sleeve.

[0013] A movable ring is slidably sleeved on the main sleeve, and the boss passes through the movable ring. The movable ring is connected to the movable rod. A connecting ring is rotatably sleeved on the outer wall of the movable ring. A cylinder is provided on the connecting ring to provide power for the movement of the connecting ring.

[0014] Furthermore, the chamfering mechanism also includes a base, and a movable stage is provided on both the main sleeve and the secondary shaft. The movable stage is slidably mounted on the base, and each movable stage is provided with a cylinder II for providing power for its movement.

[0015] The first cylinder is mounted on the side wall of the moving platform on the main sleeve, and the second cylinder is mounted on the base. The main sleeve and the secondary shaft both rotate on their respective moving platforms.

[0016] Furthermore, a motor is provided on the base, and a prism is provided at the output end of the motor. The prism is coaxial with the secondary shaft, and the end of the prism is slidably inserted into the secondary shaft. Several sliding ridges are provided on the outer wall of the secondary shaft, and several sliding grooves that cooperate with the sliding ridges are provided on the inner wall of the main sleeve.

[0017] The beneficial effects of this invention are as follows:

[0018] By using two tools to simultaneously chamfer both ends of the fixing hole, the operation can be effectively simplified, convenience can be improved, the tedious operation of frequently disassembling and assembling the end cap can be avoided, and the coaxiality of the chamfering axes of the two tools can be guaranteed, thus improving the machining accuracy. The tool can be rotated within the second long slot, making it easy to retract or release the tool from the second long slot, thereby facilitating the tool's passage through the fixing hole. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the present invention in its working state;

[0022] Figure 3 This is a schematic diagram of the main sleeve and the secondary shaft in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the secondary shaft in an embodiment of the present invention;

[0024] Figure 5 This is a partially enlarged structural diagram of the secondary shaft in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the tool structure in an embodiment of the present invention;

[0026] Figure 7 This is a schematic cross-sectional view of the support platform in an embodiment of the present invention.

[0027] Figure label:

[0028] 1. End cap; 2. Main sleeve; 3. Sub-shaft; 4. Long slot one; 5. Long slot two; 6. Notch; 7. Cutting tool; 8. Support shaft; 9. Support platform; 10. Chamfering tool; 11. Arc-shaped cutting edge; 12. Rib one; 13. Rib two; 14. Adjustment area; 15. Buckle plate; 16. Elastomer; 17. Telescopic rod; 18. Connecting rod; 19. Boss; 20. Moving rod; 21. Transmission wheel; 22. Moving ring; 23. Connecting ring; 24. Cylinder one; 25. Base; 26. Moving platform; 27. Cylinder two; 28. Motor; 29. ​​Rib shaft; 30. Sliding rib. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limiting this invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0032] like Figures 1 to 7 As shown, a chamfering mechanism for a servo motor end cap fixing hole according to the present invention includes a main sleeve 2 and a secondary shaft 3 slidably inserted in the main sleeve 2. The secondary shaft 3 has a first long groove 4 and a second long groove 5 along the axis of the secondary shaft 3, and the projections of the first long groove 4 and the second long groove 5 on the plane perpendicular to the axis of the secondary shaft 3 are perpendicular to each other. One end of the main sleeve 2 has two notches 6, and both notches 6 correspond to the second long groove 5. Two opposing cutters 7 are provided in the second long groove 5, and each cutter 7 is provided with a support shaft 8. The support shaft 8 on one cutter 7 is rotatably mounted on the secondary shaft 3, and the support shaft 8 on the other cutter 7 passes through the first long groove 4 and is rotatably mounted on the main sleeve 2.

[0033] In this invention, the secondary shaft 3 can move within the main sleeve 2, thereby adjusting the distance between the two cutters 7. This facilitates chamfering of end caps 1 of different thicknesses. Furthermore, during chamfering, the main sleeve 2 and the secondary shaft 3 can be easily moved relative to each other, allowing the two cutters 7 to approach each other and simultaneously chamfer both ends of the fixing hole. The width directions of both the first long groove 4 and the second long groove 5 extend radially through the secondary shaft 3 along its axis. The length directions of both the first and second long grooves are parallel to the axis of the secondary shaft 3, and the width directions of the first and second long grooves are perpendicular to each other. Specifically, as shown... Figure 5As shown, this allows the second long slot 5 to provide mounting positions for the two cutting tools 7, and the first long slot 4 allows the support shaft 8 on the main sleeve 2 to move relative to the main sleeve 2 when the secondary shaft 3 moves relative to the main sleeve 2, thereby satisfying the movement requirements of the main sleeve 2 and the secondary shaft 3; both slots 6 correspond to the second long slot 5, which provides sufficient space for the extension of the cutting tools 7 on the main sleeve 2; the two cutting tools 7 can be retracted into the second long slot 5 or extended beyond the second long slot 5. Since the two cutting tools 7 need to be chamfered at both ends of the fixing hole, the directions of the two cutting tools 7 are opposite.

[0034] When using, such as Figure 2 As shown, the two cutting tools 7 are rotated and retracted into the long slot 5 using the corresponding support shaft 8. At this time, the cutting tools 7 do not occupy the external space of the long slot 5. The auxiliary shaft 3 and the cutting tools 7 on it are passed through the fixing hole on the end cover 1 so that the two cutting tools 7 can be located on both sides of the fixing hole on the end cover 1. The support shaft 8 is rotated so that the two cutting tools 7 extend beyond the long slot 5. At this time, the two cutting tools 7 are in working state. The main sleeve 2 and the auxiliary shaft 3 are rotated so that the two cutting tools 7 rotate synchronously, pushing the main sleeve 2 and the auxiliary shaft 3 to move relative to each other. The two cutting tools 7 approach the fixing hole and perform rotational chamfering on both ends of the fixing hole, thereby achieving simultaneous chamfering of both ends of the fixing hole. After the chamfering is completed, the two cutting tools 7 are separated from the end cover 1. The support shaft 8 is rotated in the opposite direction to retract the two cutting tools 7 back into the long slot 5. Then the auxiliary shaft 3 is moved to pull the auxiliary shaft 3 out of the fixing hole.

[0035] In some embodiments, since only one tool 7 needs to pass through the fixing hole, the tool 7 on the main sleeve 2 can be fixed on the main sleeve 2, as long as the tool 7 on the secondary shaft 3 can be retracted into or released from the long slot 2 5; of course, the arrangement in which both tools 7 can be retracted or released can allow both tools 7 to pass through the fixing hole, which is more convenient when performing chamfering operations such as needing to pass through one fixing hole and chamfer the other fixing hole.

[0036] By using two cutting tools 7 to simultaneously chamfer both ends of the fixing hole, the operation can be effectively simplified, convenience can be improved, the tedious operation of frequently disassembling and assembling the end cap 1 can be avoided, and the chamfering axes of the two cutting tools 7 can be ensured to be coaxial, thus improving the machining accuracy. By using the setting that the cutting tool 7 can rotate within the long groove 2 5, it is easy to put the cutting tool 7 into or release it from the long groove 2 5, thereby facilitating the passing of the cutting tool 7 through the fixing hole.

[0037] Furthermore, the cutting tool 7 consists of a support platform 9 located in the middle and two chamfering cutters 10 installed on both sides of the support platform 9, and the distance between the two chamfering cutters 10 can be adjusted.

[0038] The two chamfering cutters 10 allow for double-cut chamfering of the end of the fixed hole while the main sleeve 2 and the secondary shaft 3 rotate. This effectively increases the cutting volume and work efficiency, and ensures balanced force distribution. It also prevents the main sleeve 2 and secondary shaft 3 from shifting due to force when a single chamfering cutter 10 is used, which could cause the rotation axis of the tool 7 to tilt or the overall structure to vibrate. This improves the stability and accuracy of the chamfering. The support table 9 provides support for the two chamfering cutters 10, and since the distance between the two chamfering cutters 10 is adjustable, it can chamfer fixed holes of different diameters. The support shaft 8 is connected to the support table 9.

[0039] Furthermore, the cutting edge shape of each chamfering cutter 10 is set as an arc-shaped cutting edge 11, which is inclined towards the rotation direction of the cutter 7.

[0040] On the surface where the tool 7 is located, the arc-shaped cutting edge 11 is arc-shaped. By utilizing the special shape and special setting of the arc-shaped cutting edge 11, it is convenient to directly cut the metal at the end of the fixed hole. Compared with the traditional scraping chamfering method, this oblique chamfering method is smoother and has less resistance.

[0041] Furthermore, multiple rows of ribs 12 are provided on the side wall of the chamfering cutter 10. The multiple rows of ribs 12 are arranged along the width direction of the chamfering cutter 10, and each row of ribs 12 is arranged along the length direction of the chamfering cutter 10.

[0042] The support platform 9 has a through groove along the vertical line connecting the two chamfering blades 10. The chamfering blades 10 are inserted into the through groove. Multiple rows of second ribs 13 are arranged on the inner side wall of the through groove. The multiple rows of second ribs 13 are arranged in correspondence with multiple rows of first ribs 12. The first rib 12 is used to fit into the gap between two adjacent second ribs 13. An adjustment area 14 is set between two adjacent rows of second ribs 13. The adjustment area 14 is used to provide a channel for adjusting the position of the first rib 12.

[0043] The opening of the through groove faces between the two cutting tools 7. A retaining plate 15 is provided at the opening of the through groove. The retaining plate 15 is slidably installed on the support table 9 along the direction perpendicular to the opening of the through groove, and the retaining plate 15 and the support table 9 are connected by an elastic body 16. The width direction of the chamfering tool 10 is parallel to the opening direction of the through groove.

[0044] The multi-row ribs 13 and 12 work together. When the snap plate 15 is closed at the through slot opening, the snap plate 15 confines the chamfering cutter 10 within the through slot. At this time, rib 12 is engaged between two adjacent ribs 13. When it is necessary to adjust the distance between the two chamfering cutters 10, the chamfering cutter 10 is pushed to move along the through slot opening direction, causing rib 12 to move out of the adjacent two ribs 13. At this time, rib 12 is located within the adjustment area 14, and rib 12 and rib 13 are not... Then, the chamfering cutter 10 is locked, and the movement of the chamfering cutter 10 will push the buckle plate 15 away from the support platform 9. The elastic body 16 undergoes elastic deformation and moves the chamfering cutter 10 along the length direction of the adjustment area 14, so that the first rib 12 moves to the position of the other second rib 13. Then, the first rib 12 is inserted between the corresponding two adjacent second ribs 13. The elastic body 16 pulls the buckle plate 15 to re-seal the through groove opening, thereby achieving the purpose of adjusting the position of the chamfering cutter 10 on the support platform 9.

[0045] It should be noted that since the opening of the through groove faces between the two cutting tools 7, when the cutting tool 7 is working, the reaction force of the metal at the end of the fixing hole on the cutting tool 7 will be directly transmitted to the support table 9. The support table 9 restricts the movement of the chamfering tool 10, so that the cutting tool 7 can chamfer the fixing hole smoothly. This avoids the reaction force of the metal at the end of the fixing hole on the chamfering tool 10 being transmitted to the buckle plate 15 at the opening of the through groove when the opening of the through groove faces outward from the line connecting the two cutting tools 7, causing the buckle plate 15 to move away from the support table 9.

[0046] Furthermore, the two buckle plates 15 are rotatably connected by two parallel telescopic rods 17, and the fixed or movable ends of the two telescopic rods 17 are rotatably connected by a connecting rod 18.

[0047] The fixed end and movable end of the telescopic rod 17 are respectively rotatably mounted on the two buckle plates 15. When one support platform 9 rotates with the support shaft 8, the support platform 9 can drive the buckle plate 15 on it to move synchronously. The buckle plate 15 drives the other support platform 9 to move synchronously through the two parallel telescopic rods 17, thereby making the two cutters 7 rotate synchronously in the long groove 2 5. Since the main sleeve 2 and the secondary shaft 3 can move relative to each other, when the distance between the two cutters 7 changes, the telescopic rod 17 performs telescopic movement, and the two telescopic rods 17 maintain the effect of transmitting power to the two cutters 7.

[0048] Furthermore, a boss 19 is provided on the outer wall of the main sleeve 2, and a moving rod 20 is slidably provided on the boss 19 along the axial direction of the main sleeve 2. A transmission wheel 21 is driven on the moving rod 20, and the transmission wheel 21 is connected to the support shaft 8 on the main sleeve 2.

[0049] A movable ring 22 is slidably sleeved on the main sleeve 2, and the boss 19 passes through the movable ring 22. The movable ring 22 is connected to the movable rod 20. A connecting ring 23 is rotatably sleeved on the outer wall of the movable ring 22. A cylinder 24 is provided on the connecting ring 23 to provide power for the movement of the connecting ring 23.

[0050] The boss 19 guides the movable ring 22, allowing it to slide only on the main sleeve 2. When the movable ring 22 moves on the main sleeve 2, it pushes the movable rod 20 to move. The movable rod 20 drives the transmission wheel 21 to rotate, which in turn drives the support shaft 8 and the cutter 7 on the main sleeve 2 to rotate. This adjusts the state of the two cutters 7 within the long groove 5, enabling the synchronous retraction and release of the two cutters 7. Since the main sleeve 2 needs to rotate, it can drive the movable ring 22 to rotate on the connecting ring 23. The connecting ring 23 can be used to connect the cylinder 24 and the movable ring 22, facilitating the transmission of the extension and retraction motion of the cylinder 24 to the rotating movable rod 20.

[0051] Furthermore, the chamfering mechanism also includes a base 25, and a movable stage 26 is provided on both the main sleeve 2 and the secondary shaft 3. The movable stage 26 is slidably mounted on the base 25, and each movable stage 26 is provided with a second cylinder 27 for providing power for its movement. A first cylinder 24 is mounted on the side wall of the movable stage 26 on the main sleeve 2, and a second cylinder 27 is mounted on the base 25. The main sleeve 2 and the secondary shaft 3 rotate on their respective movable stages 26.

[0052] The base 25 can support the structure above it. The two cylinders 27 can control the movement of the main sleeve 2 and the secondary shaft 3 respectively, and the main sleeve 2 and the secondary shaft 3 can rotate on the corresponding moving table 26 respectively. Since the cylinder 24 needs to provide power for the movement of the tool 7 on the main sleeve 2, the moving table 26 and the fixed end of the cylinder 24 need to be relatively stationary, that is, the fixed end of the cylinder 24 is installed on the moving table 26.

[0053] Furthermore, a motor 28 is provided on the base 25, and a prism shaft 29 is provided at the output end of the motor 28. The prism shaft 29 is coaxial with the secondary shaft 3, and the end of the prism shaft 29 is slidably inserted into the secondary shaft 3. Several sliding ribs 30 are provided on the outer wall of the secondary shaft 3, and several sliding grooves that cooperate with the sliding ribs 30 are provided on the inner wall of the main sleeve 2.

[0054] Since the secondary shaft 3 needs to move along its own axis, the transmission connection between the secondary shaft 3 and the motor 28 can be realized by using the prism 29. At the same time, by setting the sliding prism 30 and the sliding groove, the synchronous rotation of the main sleeve 2 and the secondary shaft 3 can be realized, so that the motor 28 can provide rotational power to the main sleeve 2 and the secondary shaft 3 at any position.

[0055] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A chamfering mechanism for the fixing hole of a servo motor end cover, characterized in that, The device includes a main sleeve and a secondary shaft that slides through the main sleeve. The secondary shaft has two long grooves along its axis, and the projections of the first and second long grooves on a plane perpendicular to the axis of the secondary shaft are perpendicular to each other. One end of the main sleeve has two notches, and both notches correspond to the second long groove. Two opposing cutting tools are provided in the second long groove, and each cutting tool is provided with a support shaft. The support shaft on one cutting tool is rotatably mounted on the secondary shaft, and the support shaft on the other cutting tool passes through the first long groove and is rotatably mounted on the main sleeve. The cutting tool consists of a support platform located in the middle and two chamfering blades installed on both sides of the support platform, and the distance between the two chamfering blades can be adjusted. The cutting edge of each of the chamfering knives is set to an arc-shaped cutting edge, which is inclined toward the rotation direction of the knife; The chamfering blade has multiple rows of ribs arranged on its sidewall. The multiple rows of ribs are arranged along the width direction of the chamfering blade, and each row of ribs is arranged along the length direction of the chamfering blade. The support platform has a through groove along the vertical line connecting the two chamfering blades on it. The chamfering blades are inserted into the through groove. Multiple rows of ribs II are arranged on the inner side wall of the through groove. Multiple rows of ribs II are arranged in correspondence with multiple rows of ribs I. Ribs I are used to fit into the gap between two adjacent ribs II. An adjustment area is set between two adjacent rows of ribs II. The adjustment area is used to provide a channel for adjusting the position of ribs I. The opening of the through groove faces between the two cutting tools. A buckle plate is provided at the opening of the through groove. The buckle plate is slidably mounted on the support platform along the direction perpendicular to the opening of the through groove. The buckle plate and the support platform are connected by an elastic body. The width direction of the chamfering tool is parallel to the opening direction of the through groove. The two buckle plates are rotatably connected by two parallel telescopic rods, and the fixed or movable ends of the two telescopic rods are rotatably connected by a connecting rod.

2. The chamfering mechanism for the fixing hole of the servo motor end cover according to claim 1, characterized in that, A boss is provided on the outer wall of the main sleeve, and a moving rod is slidably provided on the boss along the axis of the main sleeve. A transmission wheel is driven on the moving rod, and the transmission wheel is connected to the support shaft on the main sleeve. A movable ring is slidably sleeved on the main sleeve, and the boss passes through the movable ring. The movable ring is connected to the movable rod. A connecting ring is rotatably sleeved on the outer wall of the movable ring. A cylinder is provided on the connecting ring to provide power for the movement of the connecting ring.

3. The servo motor end cover fixing hole chamfering mechanism according to claim 2, characterized in that, The chamfering mechanism also includes a base, and a movable stage is provided on the main sleeve and the secondary shaft. The movable stage is slidably mounted on the base, and each movable stage is provided with a cylinder II for providing power for its movement. The first cylinder is mounted on the side wall of the moving platform on the main sleeve, and the second cylinder is mounted on the base. The main sleeve and the secondary shaft both rotate on their respective moving platforms.

4. The chamfering mechanism for the fixing hole of the servo motor end cover according to claim 3, characterized in that, A motor is provided on the base, and a prism is provided at the output end of the motor. The prism is coaxial with the secondary shaft, and the end of the prism is slidably inserted into the secondary shaft. Several sliding ribs are provided on the outer wall of the secondary shaft, and several sliding grooves that cooperate with the sliding ribs are provided on the inner wall of the main sleeve.

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