CN221006207U - High-stability magnetic-sensitive position sensor - Google Patents

Abstract

The utility model relates to the technical field of sensors, and particularly discloses a high-stability magnetic-sensitive position sensor which comprises a sensor main body, wherein a connecting wire harness is arranged at the left end of the sensor main body, an anti-falling mechanism is arranged at the outer side of the connecting wire harness, a rotating shaft is arranged at the lower end of the sensor main body, a top cover is inserted at the upper end of the sensor main body, fixing blocks are symmetrically and fixedly arranged at the left end and the right end of the top cover, a fixing seat is fixedly arranged at the outer side of the sensor main body, a square groove is formed in the upper end of the fixing seat, and a clamping mechanism is fixedly arranged at the lower end of the fixing block. After the sensor main body generates heat, the heat absorbs heat rapidly through the heat conducting fin at the lower end of the heat conducting plate, the upper end of the heat conducting plate is connected with the heat radiating plate with the heat radiating fin, and the heat can be dissipated rapidly through the heat radiating fin with the heat radiating groove, so that the heat dissipation inside the sensor main body is facilitated.

Description

High-stability magnetic-sensitive position sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a high-stability magnetic-sensitive position sensor.

Background

The Hall angle sensor is a magnetic sensor utilizing the Hall effect principle, is widely applied to industries such as automobile manufacture, industrial manipulator camber control, aerospace navigation equipment manufacture and the like, and is used for sensing the angle change of an accelerator pedal, a brake pedal, a clutch pedal and the like; the reliability and stability of the Hall angle sensor to the rotation angle induction are mainly evaluated by the characteristic curve linearity of the rotation angle theta of the tested rotating body and the output voltage U of the Hall angle sensor, which is hereinafter referred to as output linearity, and the Hall angle sensor can be used for detecting magnetic fields and position changes thereof and can be used in various occasions related to the magnetic fields.

Chinese patent with publication number of CN218034869U discloses a hall type angle sensor, including hall type angle sensor body, be equipped with the top cap through anticreep subassembly in the hall type angle sensor body top, and carry out dismouting connection through dismouting subassembly between top cap and the hall type angle sensor body, anticreep subassembly includes anticreep groove and anticreep chimb, dismouting subassembly includes screw, fixed block and fixing bolt.

Above-mentioned, sensor among the prior art is in top cap installation, and the spacing frame that utilizes anticreep chimb and to have the anticreep groove is pegged graft the back joint fixed block and is cooperated fixing bolt and install fixedly, and although the screw quantity that reduces has made things convenient for the installation, still need just can dismantle with the help of special instrument of dismantling when the dismouting of top cap, and is comparatively inconvenient, secondly, inside circuit board and the electronic component of containing of sensor, and owing to lack heat radiation structure, in long-time use, cause the inside heat collection that produces of sensor easily, shorten sensor's life.

For this reason, we propose a highly stable magneto-sensitive position sensor that solves the above-mentioned problems.

Disclosure of utility model

The present utility model is directed to a highly stable magneto-sensitive position sensor, which solves the above-mentioned problems of the prior art.

In order to achieve the above purpose, the utility model provides a high-stability magnetic-sensitive position sensor, which comprises a sensor main body, wherein a connecting wire harness is arranged at the left end of the sensor main body, an anti-falling mechanism is arranged at the outer side of the connecting wire harness, a rotating shaft is arranged at the lower end of the sensor main body, a top cover is inserted at the upper end of the sensor main body, fixing blocks are symmetrically and fixedly arranged at the left end and the right end of the top cover, a fixing seat is fixedly arranged at the outer side of the sensor main body, a square groove is formed in the upper end of the fixing seat, a clamping mechanism is fixedly arranged at the lower end of the fixing block, the fixing blocks are inserted through the clamping mechanism and the square groove, a clamping hole is formed in the inner wall of the square groove, the clamping mechanism is connected with a clamping Kong Weika, a pushing mechanism is arranged at the inner side of the fixing seat, the pushing mechanism is movably connected with the clamping mechanism, a heat dissipation mechanism is fixedly arranged at the upper end of the top cover, and a mounting lug is symmetrically and fixedly arranged at the outer side of the sensor main body.

In a further embodiment, the upper end of the mounting lug is symmetrically provided with a reinforcing part, the inner side of the mounting lug is provided with a mounting hole, and the lower end of the mounting lug is fixedly connected with a shock pad.

In a further embodiment, an insertion frame is fixedly arranged at the upper end of the sensor main body, a sealing ring is fixedly connected to the upper end of the insertion frame, a frame groove is formed in the lower end of the top cover, and one end, close to the sealing ring, of the insertion frame is inserted into the inner side of the frame groove.

In a further embodiment, the heat dissipation mechanism comprises a heat conduction plate, the heat conduction plate is fixedly arranged at the top of the inner side of the top cover, a heat conduction sheet is fixedly arranged at the lower end of the heat conduction plate, a heat dissipation plate penetrates through the wall of the top cover and is fixedly arranged at the upper end of the heat conduction plate, a heat dissipation sheet is fixedly arranged at the upper end of the heat dissipation plate, and a heat dissipation groove is formed in the upper end of the heat dissipation sheet.

In further embodiments, the anti-disengaging mechanism comprises a limiting pipe and a limiting cap, the limiting pipe is fixedly arranged at the left end of the sensor body, one end of the connecting wire harness movably stretches into the sensor body, a limiting cylinder is fixedly arranged on the outer wall of one end of the connecting wire harness, which is close to the sensor body, and is inserted into the inner side of the limiting pipe, the limiting cap is in threaded connection with one end of the limiting pipe, which is far away from the sensor body, the connecting wire harness movably penetrates through the limiting cap, and a rubber ring is fixedly connected with the inner wall of a perforation of the limiting cap.

In a further embodiment, a thread groove is formed in the outer wall of one end, far away from the sensor main body, of the limiting tube, and the limiting cap is in threaded connection with the outer side of the limiting tube through the thread groove.

In a further embodiment, the clamping mechanism comprises a square sleeve, one end, far away from the fixed block, of the square sleeve is spliced with the square groove, the inner side of the square sleeve is slidably connected with a mounting plate, the outer side of the mounting plate is fixedly provided with a clamping block, the clamping end of the clamping block movably penetrates through the wall of the square sleeve and the clamping hole in a clamping manner, springs are fixedly arranged on the opposite sides of the inner walls of the mounting plate and the square sleeve, and the pushing mechanism and the clamping block are movably connected.

In a further embodiment, the inner side of the square sleeve is symmetrically and fixedly provided with a guide post, the mounting plate is slidably connected to the outer side of the guide post, and the lower end face of the clamping end of the clamping block is in an inclined plane shape.

In a further embodiment, the pushing mechanism comprises a limit groove, the limit groove is formed in the outer side of the fixing seat, a limit push plate is connected to the inner side of the limit groove in a sliding mode, and an ejection block is fixedly installed on one side, facing the clamping hole, of the limit push plate.

Compared with the prior art, the utility model has the beneficial effects that:

In the utility model, after heat is generated in the sensor main body, the heat is absorbed rapidly through the heat conducting plate at the lower end of the heat conducting plate, and the upper end of the heat conducting plate is connected with the heat radiating plate, so that the heat can be dissipated rapidly through the heat radiating plate with the heat radiating groove, and the heat dissipation in the sensor main body is facilitated.

Secondly, in the utility model, when the fixed block is connected with the fixed seat, the square sleeve at the lower end of the fixed block is inserted into the square groove of the fixed seat, in the inserting process, the inclined surface of the clamping block is extruded by the notch of the square groove, so that the mounting plate connected with the clamping block slides to compress the spring at the inner side of the square sleeve, when the clamping block moves to the position of the clamping hole at the inner side of the square groove, the spring resets to push the clamping block connected with the mounting plate to clamp the clamping block into the square sleeve for fixing, thereby facilitating the quick mounting of the top cover.

Thirdly, according to the utility model, the anti-drop cylinder is additionally arranged on the outer side of the connecting wire harness, the anti-drop cylinder is arranged in the limiting pipe of the sensor main body, the connecting wire harness passes through the limiting cap, and the limiting cap is fixed on the limiting pipe, so that the limiting cylinder can be limited, and the sensor damage caused by pulling can be effectively avoided.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a partially exploded view of the present utility model;

FIG. 3 is a top plan view of the present utility model;

FIG. 4 is a schematic diagram of a heat dissipation mechanism according to the present utility model;

FIG. 5 is an enlarged view of FIG. 2A in accordance with the present utility model;

FIG. 6 is an enlarged view of FIG. 2B in accordance with the present utility model;

fig. 7 is a schematic view of the internal structure of the square sleeve according to the present utility model.

In the figure: 1. the sensor comprises a sensor main body, 2, a top cover, 3, a connecting wire harness, 4, a fixed block, 5, a fixed seat, 6, a pushing mechanism, 601, a limit push plate, 602, an ejection block, 603, a limit groove, 7, a heat dissipation mechanism, 701, a heat conducting plate, 702, a heat conducting plate, 703, a heat radiating plate, 704, a heat radiating plate, 705, a heat dissipation groove, 8, a drop prevention mechanism, 801, a limit pipe, 802, a limit cylinder, 803, a limit cap, 804, a rubber ring, 9, a mounting lug, 901, a reinforcing part, 902, a mounting hole, 903, a shock pad, 10, a rotating shaft, 11, an inserting frame, 12, a sealing ring, 13, a clamping mechanism, 131, a square sleeve, 132, a clamping block, 133, a mounting plate, 134, a spring, 14, a frame groove, 15, a thread groove, 16, a square groove, 17, a clamping hole, 18 and a guide post.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-7, in the embodiment of the utility model, a high-stability magnetic-sensing position sensor comprises a sensor main body 1, wherein a connecting wire harness 3 is arranged at the left end of the sensor main body 1, an anti-falling mechanism 8 is arranged at the outer side of the connecting wire harness 3, a rotating shaft 10 is arranged at the lower end of the sensor main body 1, a top cover 2 is inserted at the upper end of the sensor main body 1, fixing blocks 4 are symmetrically and fixedly arranged at the left end and the right end of the top cover 2, a fixing seat 5 is fixedly arranged at the outer side of the sensor main body 1, a square groove 16 is formed at the upper end of the fixing seat 5, a clamping mechanism 13 is fixedly arranged at the lower end of the fixing block 4, the fixing blocks 4 are inserted with the square groove 16 through the clamping mechanism 13, a clamping hole 17 is formed in the inner wall of the square groove 16, a pushing mechanism 6 is arranged at the inner side of the fixing seat 5 and is movably connected with the clamping mechanism 13, a heat dissipation mechanism 7 is fixedly arranged at the upper end of the top cover 2, and mounting lugs 9 are symmetrically and fixedly arranged at the outer side of the sensor main body 1; the upper end of the mounting lug 9 is symmetrically provided with a reinforcing part 901, the inner side of the mounting lug 9 is provided with a mounting hole 902, the lower end of the mounting lug 9 is fixedly connected with a shock pad 903, the mounting lug 9 passes through the reinforcing part 901, when being fastened during mounting, the problem that damage is caused by overlarge force is not easy to occur to the stability of the mounting lug 9, meanwhile, the lower end of the mounting lug 9 is additionally provided with the shock pad 903, and after being fixed, the shock pad 903 can play a certain role in buffering the sensor main body 1, so that the mounting stability of the sensor main body 1 is further ensured; the upper end of the sensor main body 1 is fixedly provided with an inserting frame 11, the upper end of the inserting frame 11 is fixedly connected with a sealing ring 12, the lower end of the top cover 2 is provided with a frame groove 14, one end, close to the sealing ring 12, of the inserting frame 11 is inserted into the inner side of the frame groove 14, and on the basis of fixing the top cover 2 and the sensor main body 1, the inserting frame 11 with the sealing ring 12 extends into the frame groove 14 of the top cover 2, so that certain tightness of the sensor main body can be ensured, and the waterproof effect is enhanced; the working principle of the Hall angle sensor is that the Hall effect is utilized, the Hall angle sensor comprises a transmission shaft, a magnet, a shell, a PCBA of the Hall sensor, an upper cover and the like, when the Hall angle sensor is used, the magnet in the Hall angle sensor is arranged at the tail end of the transmission shaft, the sensor detects the relative movement of the magnet and then converts the relative movement of the magnet into the rotation angle of the transmission shaft, the sensor is a high-precision Hall sensor, the absolute position of the magnet is calculated by calculating the magnetic field change and the difference value, the output angle can be configured in any angle range through software, and the precision of the output angle can be improved; the rotation shaft 10 on the Hall angle sensor drives the magnetic steel on the rotation shaft 10 to rotate together when rotating, the magnetic field intensity of the magnetic steel changes linearly in a certain angle range, the magnetic field intensity of the linear change is detected through the Hall element, and an electric signal is output after conditioning and amplification, namely the electric signal which changes linearly along with the rotation angle is output, so that the detection of the rotation angle is realized.

Referring to fig. 1-4, the heat dissipation mechanism 7 includes a heat conduction plate 701, wherein the heat conduction plate 701 is fixedly installed on the top of the inner side of the top cover 2, a heat dissipation plate 704 is fixedly installed at the lower end of the heat conduction plate 701, the upper end of the heat conduction plate 701 penetrates through the wall of the top cover 2, a heat dissipation plate 704 is fixedly installed at the upper end of the heat dissipation plate 704, a heat dissipation groove 705 is formed at the upper end of the heat dissipation plate 703, after heat is generated in the sensor main body 1, the heat is quickly absorbed through the heat conduction plate 702 at the lower end of the heat conduction plate 701, and the upper end of the heat conduction plate 701 is connected with the heat dissipation plate 704 with the heat dissipation plate 703, so that the heat can be quickly dissipated through the heat dissipation plate 703 with the heat dissipation groove 705, and the heat dissipation of the inside the sensor main body 1 is facilitated; the heat conducting plate 701 and the heat conducting fin 702 are both made of copper materials, the heat radiating plate 704 and the heat radiating fin 703 are both made of aluminum materials, the heat radiating fin 703 can facilitate left and right air circulation and heat radiation, and the heat radiating slot 705 can facilitate front and rear air circulation and heat radiation.

Referring to fig. 1-2 and 5, the anti-falling mechanism 8 comprises a limiting tube 801 and a limiting cap 803, wherein the limiting tube 801 is fixedly arranged at the left end of the sensor body 1, one end of a connecting wire harness 3 movably stretches into the sensor body 1, a limiting cylinder 802 is fixedly arranged on the outer wall of one end of the connecting wire harness 3, which is close to the sensor body 1, the limiting cylinder 802 is inserted into the inner side of the limiting tube 801, the limiting cap 803 is in threaded connection with one end of the limiting tube 801, which is far away from the sensor body 1, one end of the connecting wire harness 3, which is far away from the limiting cylinder 802, movably penetrates through the limiting cap 803, a rubber ring 804 is fixedly connected to the perforated inner wall of the limiting cap 803, and after the anti-falling cylinder is arranged in the limiting tube 801 of the sensor body 1, the connecting wire harness 3 passes through the limiting cap 803, and the limiting cap 803 is fixed on the limiting tube 801, so that the limiting cylinder 802 can be limited, thereby effectively avoiding the damage of the sensor caused by pulling; one end of the connecting wire harness 3 extending into the sensor body 1 is connected with a circuit board in the sensor body 1; the outer wall of one end of the limiting pipe 801 far away from the sensor main body 1 is provided with a thread groove 15, the limiting cap 803 is connected to the outer side of the limiting pipe 801 through the thread groove 15 in a threaded manner, and the limiting cap 803 can be conveniently fixed on the limiting pipe 801 through the thread groove 15 arranged on the outer side of the limiting pipe 801; the rubber ring 804 on the limiting cap 803 can avoid the damage to the connecting wire harness 3 during threading.

Referring to fig. 1-3 and fig. 6-7, the clamping mechanism 13 comprises a square sleeve 131, one end of the square sleeve 131 far away from the fixed block 4 is spliced with the square groove 16, the inner side of the square sleeve 131 is connected with a mounting plate 133 in a sliding manner, the outer side of the mounting plate 133 is fixedly provided with a clamping block 132, the clamping end of the clamping block 132 movably penetrates through the sleeve wall of the square sleeve 131 and is clamped with a clamping hole 17, the opposite sides of the inner walls of the mounting plate 133 and the square sleeve 131 are fixedly provided with springs 134, the pushing mechanism 6 and the clamping block 132 are movably connected, when the fixed block 4 and the fixed seat 5 are connected, the square sleeve 131 at the lower end of the fixed block 4 is inserted into the square groove 16 of the fixed seat 5, in the inserting process, the inclined surface of the clamping block 132 is extruded by the notch of the square groove 16, so that the mounting plate 133 connected with the clamping block 132 slides to compress the springs 134 at the inner side of the square sleeve 131, and when the clamping block 132 moves to the position of the clamping hole 17 at the inner side of the square groove 16, the springs 134 are reset to push the clamping block 132 connected with the clamping block 132 into the clamping block to be fixed, thereby facilitating rapid installation of the top cover 2; the guide posts 18 are symmetrically and fixedly arranged on the inner side of the square sleeve 131, the mounting plate 133 is slidably connected to the outer side of the guide posts 18, the lower end face of the clamping end of the clamping block 132 is in an inclined plane shape, the guide posts 18 are arranged on the inner side of the square sleeve 131, so that the mounting plate 133 can conveniently slide, and meanwhile, one end of the guide posts 18 penetrates through the middle of the spring 134, so that the stability of the spring 134 can be improved; the depth of the square groove 16 is larger than the length of the square sleeve 131, so that the sealing and mounting effect of the top cover 2 can be guaranteed.

Referring to fig. 1-2 and fig. 6, the pushing mechanism 6 includes a limit groove 603, the limit groove 603 is formed on the outer side of the fixed seat 5, a limit push plate 601 is slidably connected to the inner side of the limit groove 603, an ejector block 602 is fixedly mounted on one side of the limit push plate 601 towards the clamping hole 17, during disassembly, the limit push plate 601 at the limit groove 603 of the fixed seat 5 is only required to be extruded simultaneously, the ejector block 602 connected with the limit push plate 601 extends into the clamping hole 17, the clamping end of the clamping block can be pushed out, then the top cover 2 is pulled up to complete disassembly, no external tool is needed in the disassembly process, and the operation is simple and the use is convenient.

The working principle of the utility model is as follows: when the top cover 2 and the sensor main body 1 are installed, the square sleeve 131 at the lower end of the fixed block 4 is inserted into the square groove 16 of the fixed seat 5, in the insertion process, the inclined surface of the clamping block 132 is extruded by the notch of the square groove 16, the mounting plate 133 connected with the clamping block 132 slides to compress the spring 134 at the inner side of the square sleeve 131, when the clamping block 132 moves to the position of the clamping hole 17 at the inner side of the square groove 16, the spring 134 resets to push the clamping block 132 connected with the mounting plate 133 to clamp into the clamping plate to be fixed, thereby facilitating the rapid installation of the top cover 2, only the limiting push plate 601 at the limiting groove 603 of the fixed seat 5 is required to be extruded simultaneously during the disassembly, the ejection block 602 connected with the limiting push plate 601 stretches into the clamping hole 17, the clamping end of the clamping block can be pushed out, then the top cover 2 is pulled upwards to be disassembled, in the use process, the connecting wire harness 3 passes through the limiting cap 801 after the anti-release cylinder is arranged in the limiting tube 801 of the sensor main body 1, the limiting cap is reset to push the limiting plate 132, the limiting cap is fixed on the limiting tube 801, the heat absorber 803 can be prevented from being damaged by the heat sink 803, and the heat can be dissipated through the heat sink 703, and the heat can be prevented from being rapidly dissipated through the heat sink 703, and the heat sink 702.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (9)

1. The utility model provides a high stable magnetism sensitive position sensor, its characterized in that, includes the sensor main part, the left end of sensor main part is equipped with the connection pencil, the outside of connection pencil is equipped with anticreep mechanism, the lower extreme of sensor main part is equipped with the pivot, the upper end of sensor main part is pegged graft and is had the top cap, both ends equal symmetry fixed mounting has the fixed block about the top cap, the outside fixed mounting of sensor main part has the fixing base, square groove has been seted up to the upper end of fixing base, the lower extreme fixed mounting of fixed block has screens mechanism, the fixed block is pegged graft through screens mechanism and square groove, the draw-in hole has been seted up to the inner wall of square groove, screens mechanism and card Kong Weika connect, the inboard of fixing base is equipped with pushing mechanism, pushing mechanism and screens mechanism are swing joint, the upper end fixed mounting of top cap has heat dissipation mechanism, the outside symmetry fixed mounting of sensor main part has the installation ear.

2. The high-stability magnetic-sensing position sensor according to claim 1, wherein the upper ends of the mounting ears are symmetrically provided with reinforcing parts, the inner sides of the mounting ears are provided with mounting holes, and the lower ends of the mounting ears are fixedly connected with shock pads.

3. The high-stability magnetic-sensitive position sensor according to claim 1, wherein an insertion frame is fixedly arranged at the upper end of the sensor main body, a sealing ring is fixedly connected to the upper end of the insertion frame, a frame groove is formed in the lower end of the top cover, and one end, close to the sealing ring, of the insertion frame is inserted into the inner side of the frame groove.

4. The high-stability magneto-sensitive position sensor of claim 1, wherein the heat dissipation mechanism comprises a heat conduction plate, the heat conduction plate is fixedly arranged at the top of the inner side of the top cover, a heat conduction sheet is fixedly arranged at the lower end of the heat conduction plate, a heat dissipation plate is fixedly arranged at the upper end of the heat conduction plate penetrating through the wall of the top cover, a heat dissipation sheet is fixedly arranged at the upper end of the heat dissipation plate, and a heat dissipation groove is formed at the upper end of the heat dissipation sheet.

5. The high-stability magnetic-sensitive position sensor according to claim 1, wherein the anti-disengaging mechanism comprises a limiting tube and a limiting cap, the limiting tube is fixedly arranged at the left end of the sensor body, one end of the connecting wire harness movably stretches into the sensor body, a limiting cylinder is fixedly arranged on the outer wall of one end, close to the sensor body, of the connecting wire harness, the limiting cylinder is inserted into the inner side of the limiting tube, the limiting cap is in threaded connection with one end, far away from the sensor body, of the limiting tube, one end, far away from the limiting cylinder, of the connecting wire harness movably penetrates through the limiting cap, and a rubber ring is fixedly connected with the inner wall of a perforation of the limiting cap.

6. The high-stability magneto-dependent position sensor of claim 5, wherein the outer wall of the end, far away from the sensor main body, of the limiting tube is provided with a thread groove, and the limiting cap is in threaded connection with the outer side of the limiting tube through the thread groove.

7. The high-stability magnetic-sensing position sensor according to claim 1, wherein the clamping mechanism comprises a square sleeve, one end of the square sleeve, which is far away from the fixed block, is spliced with the square groove, the inner side of the square sleeve is slidably connected with a mounting plate, the outer side of the mounting plate is fixedly provided with a clamping block, the clamping end of the clamping block movably penetrates through the wall of the square sleeve and is clamped with a clamping hole, the opposite sides of the inner walls of the mounting plate and the square sleeve are fixedly provided with springs, and the pushing mechanism is movably connected with the clamping block.

8. The high-stability magnetic-sensing position sensor according to claim 7, wherein guide posts are symmetrically and fixedly arranged on the inner side of the square sleeve, the mounting plate is slidably connected to the outer side of the guide posts, and the lower end face of the clamping end of the clamping block is in an inclined plane shape.

9. The magnetically sensitive position sensor according to claim 7, wherein the pushing mechanism comprises a limit groove, the limit groove is formed in the outer side of the fixing seat, a limit push plate is connected to the inner side of the limit groove in a sliding manner, and an ejection block is fixedly installed on one side, facing the clamping hole, of the limit push plate.