A center clamping device for machining motor shafts

Abstract

This invention belongs to the field of motor shaft machining technology, specifically a center clamping device for the end face of motor shafts. Addressing the problem that existing motor shaft machining methods often involve clamping the end face, preventing machining of the circumferential edge of the shaft body, the invention proposes the following solution: a C-shaped mounting bracket comprising a backing plate and two vertical side supports. The tops of the two side supports are respectively fixed with a ring-shaped rotating seat 1 and a rotating seat 2, both shaped like enlarged nut shapes. Inner rotating blocks 1 and 2 are rotatably connected to the middle of the rotating seats 1 and 2, respectively. This invention allows the motor shaft body to be moved towards one end during milling near the end, bringing the end to be machined closer to the center. Furthermore, the anti-slip blocks abutting the end of the motor shaft body effectively prevent slippage.

Description

Technical Field

[0001] This invention relates to the field of motor shaft machining technology, and in particular to an end face center clamping device for machining motor shafts. Background Technology

[0002] An electric motor is a device used to convert electrical energy into mechanical energy and vice versa; it is a major driving component in modern industrial systems. The motor shaft, a component of the motor, is a device that converts electrical energy into mechanical energy and is widely used in the electromechanical field.

[0003] Before being used at the factory, the motor shaft needs to be processed by grinding, cutting or grooving. The motor shaft needs to be clamped by a clamping fixture and then placed on a CNC machine tool for processing.

[0004] Research indicates that one of the main problems in the current machining of shaft parts is the excessive cylindricity caused by the cutting force resulting in runout at the front end due to misalignment between the rear center axis and the main axis, or excessive clamping overhang. To address this, we provide a device that ensures the end axis of the machined shaft part coincides with the main axis of the machine tool, thus avoiding excessive cylindricity. Summary of the Invention

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an end face center clamping device for machining motor shafts, comprising an integrally C-shaped mounting bracket, the mounting bracket including a back plate and two vertically aligned side supports, the top ends of the two side supports respectively fixed with an integrally annular rotating seat one and a rotating seat two, the integrally an enlarged nut-shaped structure of the rotating seat one and the rotating seat two, and an inner rotating block one and an inner rotating block two respectively rotatably connected in the middle of the rotating seat one and the rotating seat two, the sides of the inner rotating block one and the inner rotating block two respectively having pre-reserved coaxially distributed threaded through holes, and multiple equally spaced rollers fixed to the outer walls of the inner rotating block one and the inner rotating block two. The roller frame is equipped with protruding rollers. The inner circumference of both rotating seat one and rotating seat two is provided with anti-slip annular grooves. The bottom of the anti-slip annular grooves is in close contact with the outer circumference of the rollers, and the width of the anti-slip annular grooves is adapted to the length of the rollers. Two self-locking push tubes are screwed into the two threaded holes respectively. The outer wall of the self-locking push tubes is provided with self-locking threads that engage with the threads of the threaded holes. High-hardness nuts are embedded at both ends of the self-locking push tubes, and a clamping screw is screwed into each self-locking push tube. The opposite ends of the two clamping screws are provided with slots, and anti-slip blocks are engaged in the two slots. Multiple notches are provided at the opposite ends of the two self-locking push tubes.

[0006] Preferably, each of the two self-locking propulsion tubes has a rotating wheel fixed to the outer circumference of its opposite end, and the threaded cross-section of the self-locking propulsion tube is rectangular.

[0007] Preferably, the teeth on the inner circumference of the high-hardness nut are carburized.

[0008] Preferably, a belt groove is formed in the middle of the outer wall of the inner rotating block, and belt through holes are formed at the top of the side brackets at the end of the rotating seat and the mounting bracket. A drive motor is fixed on the upper surface of the mounting bracket near the belt through holes, and an active pulley is fixed at the top of the output shaft of the drive motor. A conveyor belt is provided between the active pulley and the belt groove.

[0009] Preferably, the inner rotating block has three guide rod sliding holes on its side, and each of the three guide rod sliding holes is slidably connected to an extension guide rod. The three extension guide rods are fixed to the same anti-torsion mechanism at one end of the motor shaft body. The anti-torsion mechanism includes three centrally symmetrical rectangular tubes, three connecting plates connecting the three rectangular tubes, and mounting holes on the side of each of the three rectangular tubes away from the rotating block. A grooved slide rail is fixed in each of the three mounting holes, and a combined slider is slidably connected in the grooved slide rail. A return spring is fixed on the side of each of the three combined sliders near the motor shaft body, and a spring baffle is fixed on the end of each return spring away from the combined slider. The spring baffle is fixed at the bottom of the groove of the grooved slide rail on its side. A telescopic stop rod is embedded at the end of the combined slider away from the grooved slide rail, and a slanted block is fixed at the end of the extension rod of the telescopic stop rod. The slanted blocks are centrally symmetrically distributed and are made of rubber material.

[0010] Preferably, the telescopic abutment includes an extension rod and a main tube, and the outer circumferential wall of the extension rod is provided with a protruding ridge, the inner circumferential wall of the main tube is provided with a through groove that matches the protruding ridge, and a clamping spring is fixed to the end of the extension rod away from the inclined block.

[0011] Preferably, the bottom of the groove of the grooved slide rail is fitted with a backstop rack, and a spring groove is opened on the side of the combined slider near the backstop rack. A backstop rod is slidably connected to the opening of the spring groove. A second clamping spring is fixed between the backstop rod and the bottom of the spring groove. The tooth cross section of the backstop rod is a right-angled triangular structure. A rope hole communicating with the bottom of the spring groove is opened on the lower surface of the combined slider, and a release pull rope is provided in the rope hole. One end of the release pull rope is fixed to the tail of the backstop rod.

[0012] Preferably, both sides of the grooved slide rail and the rectangular tube have strip-shaped rope holes at the ends away from the motor shaft body, and the same steel wire is inserted into all the strip-shaped rope holes. The steel wire binds the three combined sliders at the same time. When it is necessary to press the three combined sliders at the same time, it is only necessary to pull the two ends of the steel wire.

[0013] Preferably, the uppermost connecting plate has an internal threaded component embedded in the middle, and the top of the internal threaded component is rotatably connected to a self-locking bolt head; the two ends of the steel wire are fixed to the outer wall of the self-locking bolt head, and when it is necessary to pull the two ends of the steel wire, it is only necessary to screw on the self-locking bolt head.

[0014] Preferably, the two self-locking push tubes are respectively provided with flared mouths facing each other at their opposite ends, and the inner circumference of the two flared mouths is provided with oblique threads; an anti-disengagement ring is fixed on the side of the inner rotating block away from the anti-torsion mechanism, and a locking ring is rotatably connected to the anti-disengagement ring. A notch is opened at the edge of the locking ring away from the inner rotating block, and a pressing strip is rotatably connected to the bottom of the notch. A pressing spring is provided between the side of the pressing strip and the bottom of the groove; a protruding ear plate is reserved at the circumferential edge of the locking ring, and a positioning bolt is provided at the end of the protruding ear plate. An arc-shaped locking block is provided on the side of the inner rotating block that matches the position of the positioning bolt.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. By using two self-locking push tubes, when milling the motor shaft body near the end, the entire motor shaft body can be moved to one end, thereby bringing the end that needs to be turned closer to the center position. In addition, the anti-slip block against the end of the motor shaft body effectively prevents the motor shaft body from slipping.

[0017] 2. By setting an inclined block that tightly hugs the outer wall of the motor shaft body, the contact area between the inclined block and the motor shaft body is increased, thereby increasing the static friction and improving the anti-torsion effect.

[0018] 3. With the anti-reverse lever and release rope, when clamping a motor shaft body with a large diameter, you only need to press the three combined sliders towards the center at the same time to hold the three inclined blocks tightly against the outer wall of the motor shaft body. When you need to reset, just pull the release rope.

[0019] 4. The locking ring can be rotated clockwise to press the corresponding abutment strip tightly against the outer wall of the extension guide rod, thus providing reinforcement. Moreover, this clamping device can adapt to motor shaft bodies of different diameters and increases the gripping and anti-slip clamping ability of the motor shaft body. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the end face center clamping device for machining motor shafts proposed in this invention during clamping.

[0021] Figure 2 This is a schematic diagram of the rear structure of an end face center clamping device for machining motor shafts proposed in this invention.

[0022] Figure 3 This is a top view of an end face center clamping device for machining motor shafts proposed in this invention;

[0023] Figure 4 This is a half-sectional view of the rotating seat of the end face center clamping device for machining motor shafts proposed in this invention.

[0024] Figure 5 This invention proposes an end-face center clamping device for machining motor shafts. Figure 3 A sectional view along line AA.

[0025] Figure 6 This is a schematic diagram of the structure of the end face center clamping device for machining motor shafts proposed in this invention when there is no anti-torsion mechanism.

[0026] Figure 7 This is an exploded view of an anti-torsion mechanism for an end-face center clamping device used in motor shaft machining, as proposed in this invention.

[0027] Figure 8 This is a half-section assembly drawing of the combined slider in the end face center clamping device for machining motor shafts proposed in this invention.

[0028] In the diagram: 1. Mounting bracket; 101. Belt perforation; 2. Actuating wheel; 3. Rotating seat one; 4. Inner rotating block one; 401. Belt groove; 402. Guide rod sliding hole; 5. Anti-slip annular groove; 6. Drive motor; 7. Drive pulley; 8. Motor shaft body; 9. Rotating seat two; 10. Inner rotating block two; 11. Self-locking push tube; 12. Clamping screw; 13. High-hardness nut; 14. Roller frame; 15. Anti-torsion mechanism; 151. Connecting plate; 152. Anti-reverse rack; 153. Strip rope hole; 15 4. Groove slide rail; 155. Inclined locking block; 156. Telescopic stop rod; 157. Release rope; 158. Combined slider; 159. Steel wire; 160. Self-locking bolt head; 161. Spring recess; 162. Anti-reverse stop rod; 16. Extension guide rod; 17. Anti-slip stop block; 18. Conveyor belt; 19. Locking ring; 191. Protruding ear plate; 192. Positioning bolt; 193. Notch; 194. Anti-locking strip; 195. Anti-disengagement ring; 20. Arc-shaped locking block; 21. Threaded through hole; 22. Roller. 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] Example 1

[0031] Reference Figure 1-8 A center clamping device for machining motor shafts includes a C-shaped mounting bracket 1. The mounting bracket 1 includes a backing plate and vertical side supports at both ends. The tops of the two side supports are respectively fixed with a ring-shaped rotating seat 3 and a rotating seat 9. The rotating seats 3 and 9 are enlarged nut-shaped structures. Inner rotating blocks 4 and 10 are rotatably connected to the middle of the rotating seats 3 and 20, respectively. The sides of the inner rotating blocks 4 and 10 have pre-drilled threaded holes 21 distributed coaxially. Multiple equally spaced roller frames 14 are fixed to the outer walls of the inner rotating blocks 4 and 10, each with a protruding roller 22. The inner circumferential walls of the rotating seats 3 and 20 each have an anti-slip annular groove 5. The bottom of the anti-slip annular groove 5 tightly abuts against the outer circumferential wall of the roller 22. The width of the groove 5 is adapted to the length of the roller 22; two threaded through holes 21 are respectively screwed with symmetrical self-locking push tubes 11. The outer wall of the self-locking push tube 11 has a self-locking thread that engages with the thread of the threaded through hole 21. Both ends of the self-locking push tube 11 are fitted with high-hardness nuts 13, and each self-locking push tube 11 is screwed with a clamping screw 12. The opposite ends of the two clamping screws 12 are opened with slots, and anti-slip blocks 17 are engaged in the two slots. The opposite ends of the two self-locking push tubes 11 are opened with multiple notches. With the two self-locking push tubes 11, when the motor shaft body 8 is milled near the end, the motor shaft body 8 can be moved to one end, so that the end to be turned is closer to the middle position. In addition, the anti-slip blocks 17 at the end of the motor shaft body 8 effectively prevent the motor shaft body 8 from slipping.

[0032] The outer circumference of the two self-locking push tubes 11, which are far apart, is fixed with a turning wheel 2, and the thread cross section of the self-locking push tube 11 is rectangular; this improves the radial anti-reverse capability of the self-locking push tube 11 and effectively prevents the occurrence of tooth stripping and skipping due to meshing gap.

[0033] Among them, the teeth on the inner circumference of the high-hardness nut 13 are carburized. By setting the high-hardness nut 13 with carburized treatment, the anti-breakage effect of the teeth of the high-hardness nut 13 can be improved, and its wear resistance and service life can be increased.

[0034] The inner rotating block 4 has a belt groove 401 in the middle of its outer wall, and the top of the side brackets at the ends of the rotating seat 3 and the mounting bracket 1 have belt through holes 101. The upper surface of the mounting bracket 1 is fixed with a drive motor 6 near the belt through hole 101. The top of the output shaft of the drive motor 6 is fixed with a drive pulley 7. A conveyor belt 18 is provided between the drive pulley 7 and the belt groove 401. The belt drive improves the protection of the drive motor 6 and exposes the end of the clamping device, which is convenient for fixing and axial movement of the overall position.

[0035] The inner rotating block 4 has three guide rod sliding holes 402 on its side, and each of the three guide rod sliding holes 402 is slidably connected to an extension guide rod 16. The three extension guide rods 16 are fixed to the same anti-torsion mechanism 15 at one end of the motor shaft body 8. The anti-torsion mechanism 15 includes three centrally symmetrical rectangular tubes, and three connecting plates 151 are connected between the three rectangular tubes. Each of the three rectangular tubes has a mounting hole on the side away from the rotating seat 3. Each of the three mounting holes is fixed with a grooved slide rail 154. A combined slider 158 is slidably connected to the grooved slide rail 154, and each of the three combined sliders 158 is fixed on the side closer to the motor shaft body 8. A return spring is provided, and a spring baffle is fixed to the end of the return spring away from the combined slider 158. The spring baffle is fixed to the bottom of the groove of the grooved slide rail 154 on the same side. A telescopic abutment rod 156 is embedded at the end of the combined slider 158 away from the grooved slide rail 154, and a slanted block 155 is fixed to the end of the extension rod of the telescopic abutment rod 156. The slanted blocks 155 are centrally symmetrically distributed and are made of rubber material. By setting the slanted blocks 155 that tightly hug the outer wall of the motor shaft body 8, the contact area between the slanted blocks 155 and the motor shaft body 8 is increased, thereby increasing the static friction and improving the anti-torsion effect.

[0036] The telescopic stop rod 156 includes an extension rod and a main tube. The outer circumference of the extension rod is provided with a protruding ridge, and the inner circumference of the main tube is provided with a through groove that matches the protruding ridge. A clamping spring is fixed to the end of the extension rod away from the inclined block 155. With the clamping spring and the extension rod with the protruding ridge, the inclined block 155 can always be kept in an inclined state and held on the outer wall of the motor shaft body 8.

[0037] The groove bottom of the grooved slide rail 154 is fitted with anti-reverse racks 152. A spring groove 161 is formed on the side of the combined slider 158 near the anti-reverse racks 152. An anti-reverse rod 162 is slidably connected to the opening of the spring groove 161. A retaining spring is fixed between the anti-reverse rod 162 and the bottom of the spring groove 161. The teeth of the anti-reverse rod 162 have a right-angled triangular cross-section. The lower surface of the combined slider 158 has a groove that corresponds to the bottom of the spring groove 161. The device has a through rope hole with a release pull rope 157 installed inside. One end of the release pull rope 157 is fixed to the tail of the anti-reverse rod 162. With the anti-reverse rod 162 and the release pull rope 157 installed, when clamping the motor shaft body 8 with a large diameter, it is only necessary to press the three combined sliders 158 towards the center at the same time to tightly hold the three inclined blocks 155 on the outer wall of the motor shaft body 8. When it is necessary to reset, it is only necessary to pull the release pull rope 157.

[0038] Among them, the grooved slide rail 154 and the rectangular tube have strip rope holes 153 on both sides away from the motor shaft body 8, and the same steel wire 159 is inserted in all the strip rope holes 153. The steel wire 159 binds the three combined sliders 158 at the same time. When it is necessary to press the three combined sliders 158 at the same time, it is only necessary to pull the two ends of the steel wire 159.

[0039] The uppermost connecting plate 151 has an internal threaded component embedded in the middle, and the top of the internal threaded component is rotatably connected to a self-locking bolt head 160; the two ends of the steel wire 159 are fixed to the outer wall of the self-locking bolt head 160. When it is necessary to pull the two ends of the steel wire 159, simply tighten the self-locking bolt head 160.

[0040] Example 2

[0041] Reference Figure 2 and 4A center clamping device for machining motor shafts, based on Embodiment 1, further includes two self-locking push tubes 11 with opposing flared openings at one end, and the inner walls of both flared openings are provided with oblique threads; an anti-disengagement ring 195 is fixed on the side of the inner rotating block 4 away from the anti-torsion mechanism 15, and a locking ring 19 is rotatably connected to the anti-disengagement ring 195. A notch 193 is opened on the edge of the locking ring 19 away from the inner rotating block 4, and a clamping strip 194 is rotatably connected to the bottom of the notch 193. The side of the clamping strip 194 is connected to the bottom of the groove. A retaining spring is provided; a protruding ear plate 191 is reserved at the circumferential edge of the locking ring 19, and a positioning bolt 192 is provided at the end of the protruding ear plate 191. An arc-shaped locking block 20 adapted to the position of the positioning bolt 192 is provided on the side of the inner rotating block 4. Through the locking ring 19, the corresponding retaining strip 194 can be tightly pressed against the outer wall of the extension guide rod 16 by rotating the locking ring 19 clockwise, which plays a reinforcing role. Moreover, the clamping device can adapt to motor shaft bodies 8 of different diameters and increases the biting and anti-slip clamping ability of the motor shaft body 8.

[0042] Before using this device, first rotate the two self-locking push tubes 11 to move them in the opposite direction, leaving enough space to place the motor shaft body 8 between the two self-locking push tubes 11. Then rotate the motor shaft body 8 so that the self-locking push tubes 11 clamp the motor shaft body 8, ensuring that the center of the motor shaft body 8 coincides with the axis of the self-locking push tube 11. Then screw the locking screws 12 at both ends to firmly press the anti-slip blocks 17 against the end of the motor shaft body 8 to achieve an anti-slip effect. Finally, the outer wall of the motor shaft body 8 can be machined. If the motor shaft body 8 still slips during machining, the anti-reverse rod 162 and the release rope 157 can be used to press the three combined sliders 158 towards the center when clamping a motor shaft body 8 with a larger diameter. This will hold the three inclined blocks 155 tightly against the outer wall of the motor shaft body 8. To reset, simply pull the release rope 157.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A center clamping device for machining the end face of a motor shaft, comprising an integrally C-shaped mounting bracket (1), the mounting bracket (1) comprising a backing plate and two vertically aligned side supports, the top ends of which are respectively fixed with an integrally ring-shaped rotating seat one (3) and a rotating seat two (9), characterized in that, The rotating seat one (3) and rotating seat two (9) are enlarged nut-shaped structures. The inner rotating block one (4) and inner rotating block two (10) are rotatably connected in the middle of the rotating seat one (3) and rotating seat two (9), respectively. The inner rotating block one (4) and inner rotating block two (10) are respectively reserved with coaxially distributed threaded through holes (21) on their sides. The outer walls of the inner rotating block one (4) and inner rotating block two (10) are fixed with multiple equally spaced roller frames (14), and each roller frame (14) is provided with a protruding roller (22). The inner circumference of the rotating seat one (3) and rotating seat two (9) is provided with an anti-slip annular groove (5). The bottom of the anti-slip annular groove (5) is... It is in close contact with the outer circumference of the roller (22), and the groove width of the anti-slip annular groove (5) is adapted to the length of the roller (22); two threaded through holes (21) are respectively screwed with symmetrical self-locking push tubes (11), the outer wall of the self-locking push tube (11) is opened with a self-locking thread that engages with the thread of the threaded through hole (21), both ends of the self-locking push tube (11) are fitted with high hardness nuts (13), and each self-locking push tube (11) is screwed with a clamping screw (12), the opposite ends of the two clamping screws (12) are opened with a slot, and the two slots are fitted with anti-slip blocks (17), and the opposite ends of the two self-locking push tubes (11) are opened with multiple notches; The inner rotating block 1 (4) has three guide rod sliding holes (402) on its side. Each of the three guide rod sliding holes (402) is slidably connected to an extension guide rod (16). The three extension guide rods (16) are fixed to the same anti-torsion mechanism (15) at one end of the motor shaft body (8). The anti-torsion mechanism (15) includes three centrally symmetrical rectangular tubes. Three connecting plates (151) are connected between the three rectangular tubes. Each of the three rectangular tubes has a mounting hole on the side away from the rotating seat 1 (3). Each of the three mounting holes is fixed with a grooved slide rail (154). The grooved slide rail (154) slides in the grooved slide rail (154). The three combined sliders (158) are connected, and each of the three combined sliders (158) is fixed with a return spring on the side of the motor shaft body (8). The end of the return spring away from the combined slider (158) is fixed with a spring baffle, which is fixed at the bottom of the groove of the grooved slide rail (154) on the same side. The end of the combined slider (158) away from the grooved slide rail (154) is fitted with a telescopic abutment (156), and the end of the extension rod of the telescopic abutment (156) is fixed with a slanted block (155). The slanted blocks (155) are centrally symmetrically distributed and are made of rubber material. The telescopic abutment (156) includes an extension rod and a mother tube. The outer circumference of the extension rod is provided with a protruding ridge, and the inner circumference of the mother tube is provided with a through groove that matches the protruding ridge. A clamping spring is fixed at the end of the extension rod away from the inclined block (155). The groove bottom of the groove-shaped slide rail (154) is fitted with anti-reverse racks (152). The combined slider (158) has a spring groove (161) on the side near the anti-reverse rack (152). An anti-reverse rod (162) is slidably connected to the opening of the spring groove (161). A clamping spring is fixed between the anti-reverse rod (162) and the bottom of the spring groove (161). The tooth cross section of the anti-reverse rod (162) is a right-angled triangle structure. The lower surface of the combined slider (158) has a rope hole that communicates with the bottom of the spring groove (161). A release pull rope (157) is provided in the rope hole. One end of the release pull rope (157) is fixed to the tail of the anti-reverse rod (162). The grooved slide rail (154) and the rectangular tube have strip rope holes (153) on both sides away from the motor shaft body (8), and the same steel wire (159) is inserted in all the strip rope holes (153). The steel wire (159) simultaneously binds the three combined sliders (158). The uppermost connecting plate (151) has an internal threaded part embedded in the middle, and the top of the internal threaded part is rotatably connected to a self-locking bolt head (160); the two ends of the steel wire (159) are fixed to the outer wall of the self-locking bolt head (160).

2. The end face center clamping device for machining motor shafts according to claim 1, characterized in that, The outer circumference of the two self-locking propulsion tubes (11) at opposite ends is fixed with a rotating wheel (2), and the threaded cross section of the self-locking propulsion tube (11) is rectangular.

3. The end face center clamping device for machining motor shafts according to claim 1, characterized in that, The teeth on the inner circumference of the high-hardness nut (13) are carburized.

4. The end face center clamping device for machining motor shafts according to claim 1, characterized in that, The inner rotating block (4) has a belt groove (401) in the middle of its outer wall, and the top of the side bracket of the rotating seat (3) and the mounting bracket (1) has a belt through hole (101). The upper surface of the mounting bracket (1) is fixed with a drive motor (6) near the belt through hole (101). The top of the output shaft of the drive motor (6) is fixed with a drive pulley (7). A conveyor belt (18) is provided between the drive pulley (7) and the belt groove (401).

5. The end face center clamping device for machining motor shafts according to claim 1, characterized in that, Two self-locking push tubes (11) are respectively provided with flared mouths with openings facing each other at one end, and the inner walls of the two flared mouths are provided with oblique threads; the inner rotating block (4) is fixed with an anti-disengagement ring (195) on the side away from the anti-torsion mechanism (15), and a locking ring (19) is rotatably connected to the anti-disengagement ring (195). The locking ring (19) has a notch (193) at the edge of the side away from the inner rotating block (4), and a pressing strip (194) is rotatably connected to the bottom of the notch (193). A pressing spring is provided between the side of the pressing strip (194) and the bottom of the groove; a protruding ear plate (191) is reserved at the circumferential edge of the locking ring (19), and a positioning bolt (192) is provided at the end of the protruding ear plate (191). An arc-shaped locking block (20) is provided on the side of the inner rotating block (4) that matches the position of the positioning bolt (192).

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