CN112571290B

CN112571290B - Local grinding device of unqualified screw thread

Info

Publication number: CN112571290B
Application number: CN202110009317.1A
Authority: CN
Inventors: 邹鹏非
Original assignee: Jining Yicheng Rolling Parts Co ltd
Current assignee: Jining Yicheng Rolling Parts Co ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2022-07-01
Anticipated expiration: 2041-01-05
Also published as: CN112571290A

Abstract

The invention discloses a local grinding device for unqualified threads, which comprises a grinding box, wherein a grinding cavity is arranged in the grinding box, the left wall and the right wall of the grinding cavity are connected with a sliding plate in a vertical sliding way, the sliding plate is connected with a gear ring block in a rotating way, a clamping cavity which is communicated up and down is arranged in the gear ring block, the left side wall and the right side wall of the clamping cavity are connected with symmetrical clamping boxes in a vertical sliding way, the upper and lower ends of the left and right side walls of the clamping cavity are fixedly connected with limit blocks, a transmission cavity which is positioned at the right side of the clamping cavity and has a leftward opening is arranged in the sliding plate, the lower wall of the transmission cavity is communicated with a contact switch cavity, the lower wall of the contact switch cavity is connected with sliding blocks in a left-right sliding manner, the upper end surface of the sliding block is rotationally connected with a gear shaft which extends upwards into the transmission cavity, the nut is driven to rotate and move downwards so as to be in threaded connection with the screw.

Description

Local grinding device of unqualified screw thread

Technical Field

The invention relates to the field related to machine polishing devices, in particular to a local polishing device for unqualified threads.

Background

In our daily life, the threaded connection is widely used as a convenient and simple connection mode, but the connection between a screw and a nut is more precise, so when slight errors occur in the processing of the screw, the phenomenon that the screw and the nut are clamped and cannot be used can occur, the phenomenon can be improved by grinding the screw, the existing grinding equipment is difficult to detect the connectivity of the screw, the screw thread is difficult to grind, and the functionality is poor.

Disclosure of Invention

In order to solve the problems, the local polishing device for the unqualified threads comprises a polishing box, a polishing cavity is arranged in the polishing box, the left wall and the right wall of the polishing cavity are connected with a sliding plate in a vertical sliding manner, a gear ring block is connected in the sliding plate in a rotating manner, a clamping cavity which is communicated up and down is arranged in the gear ring block, the left side wall and the right side wall of the clamping cavity are connected with symmetrical clamping boxes in a vertical sliding manner, the tail ends of the upper side and the lower side of the left side wall and the lower side wall of the clamping cavity are fixedly connected with limit blocks, a transmission cavity which is positioned on the right side of the clamping cavity and has a left opening is arranged in the sliding plate, a contact switch cavity is communicated with the lower wall of the transmission cavity, a sliding block is connected in a horizontal sliding manner, and the upper end face of the sliding block is connected with a gear shaft which extends upwards into the transmission cavity in a rotating manner, the right end of the upper wall and the lower wall of the polishing cavity is rotationally connected with a movable screw rod penetrating through the transmission cavity, the part of the movable screw rod penetrating through the sliding plate is in threaded connection with the sliding plate, the lower end face of the sliding plate is fixedly connected with a sand blasting box positioned right below the contact switch cavity, a sand storage cavity is arranged in the sand blasting box, a sand blasting cavity is arranged at the lower side of the sand storage cavity, the right wall of the sand blasting cavity is communicated with a water pipe, a water pump is fixedly arranged at the right side of the water pipe, a communicating cavity is communicated between the lower wall of the sand storage cavity and the upper wall of the sand blasting cavity, a connecting rod cavity is communicated with the right wall of the communicating cavity, the upper wall and the lower wall of the connecting rod cavity are connected with a sealing plate capable of sealing the communicating cavity in a left-right sliding mode, a crank wheel cavity positioned at the right side of the sand storage cavity is communicated with the upper wall of the connecting rod cavity, the lower wall of the polishing cavity is fixedly connected with a bearing block, and a bevel gear cavity with an upward opening is arranged in the bearing block, the bevel gear cavity left and right sides wall rotates to connect and extends to respectively to the left and right sides tight screw rod of bearing block left and right sides and symmetry, press from both sides tight screw rod and be located the outer disc threaded connection of one side outside the bearing block have with polish the chamber lower wall side to side sliding connection's arc press from both sides tight block, bevel gear cavity sliding connection has the propelling out piece from top to bottom.

But preferably, the left and right sides be equipped with the clamping spring chamber in the clamping box, the upper and lower wall horizontal sliding connection in clamping spring chamber has the tight push pedal of clamp, the tight push pedal of clamp is close to one side each other and stretches out to the piece that stretches out outside the clamping spring chamber, the tight push pedal of clamp keep away from each other a side end face with fixedly connected with clamping spring between the lateral wall that the clamping spring chamber kept away from each other, a side end face fixedly connected with pinch plate that the piece is close to each other stretches out, a side end face bottom fixedly connected with bottom plate that the pinch plate is close to each other controls bottom plate up end is placed and is equipped with the nut, be equipped with the nut chamber that link up from top to bottom in the nut.

Preferably, a gear ring is fixedly arranged on the outer circular surface of the gear ring block, a movable gear in meshing transmission with the gear ring is fixedly connected to the outer circular surface of the gear shaft, a switch board positioned on the right side of the sliding block is fixedly connected to the lower wall of the contact switch cavity, a switch spring is fixedly connected between the left end surface of the switch board and the right end surface of the sliding block, a contact switch positioned on the upper side of the switch spring is fixedly connected to the left end surface of the switch board, a bidirectional power device positioned on the right side of the switch board is fixedly arranged on the lower wall of the contact switch cavity, an upper power shaft extending upwards into the transmission cavity is in power connection with the upper end surface of the bidirectional power device, a sleeve is in key connection with the outer circular surface of the movable screw rod positioned in the transmission cavity, and belt wheels are fixedly connected to the outer circular surface of the gear shaft positioned on the lower side of the movable gear and the outer circular surfaces of the upper power shaft and the sleeve, and a belt is wound among the three belt wheels.

Preferably, terminal surface power is connected with downwardly extending under the two-way power device downside power shaft in the crank wheel cavity, downside power shaft outer disc fixed connection has the crank wheel, the crank wheel up end rotates to be connected with downwardly extending to the connecting axle in the connecting rod cavity, the connecting axle is located one side outer disc rotation in the connecting rod cavity is connected with the connecting rod, the connecting rod up end rotates to be connected with downwardly extending to the connecting axle of connecting rod downside, it is connected with the hinge lever to connect connecting axle outer disc rotation, the hinge lever left end face with the closing plate right-hand member face is articulated, sandblast case left end face fixedly connected with the shower nozzle of sandblast chamber left side intercommunication.

Preferably, a baffle is fixedly connected to one side end face of each arc-shaped clamping block, a clamping motor is fixedly arranged on the lower wall of the polishing cavity, the upper end face of the clamping motor is in power connection with a motor shaft which extends upwards into the bevel gear cavity, a clutch shaft sleeve is arranged on the upper side of the motor shaft, a clutch cavity is arranged on the lower end face of the clutch shaft sleeve in a communicating mode, the clutch cavity is in splined connection with the motor shaft, a clutch gear cavity is arranged on the upper end face of the clutch shaft sleeve in a communicating mode, an annular clutch gear ring is fixedly connected into the clutch gear cavity, an internal thread cavity with a downward opening is arranged in the pushing block, a pushing shaft extending downwards into the clutch gear cavity is in threaded connection with the internal thread cavity, and the pushing shaft is located on the outer circular face of one side of the clutch gear cavity and fixedly connected with a clutch gear.

Preferably, the upper end face of the motor shaft is fixedly connected with a clutch spring, the top end of the clutch spring is abutted to the upper wall of the clutch cavity, the upper end face of the motor shaft is fixedly connected with an electromagnet positioned on the right side of the clutch spring, the upper end face of the clutch cavity is fixedly connected with a magnetic block corresponding to the electromagnet, the outer circular face of the clutch shaft sleeve is fixedly connected with a driving bevel gear, the outer circular face of one side of the left clamping screw rod and the right clamping screw rod positioned in the bevel gear cavity is fixedly connected with a driven bevel gear capable of being in meshing transmission with the driving bevel gear, and a screw is arranged on the upper end face of the bearing block.

The invention has the beneficial effects that: according to the invention, after the screw is clamped, whether the screw thread processing of the screw is qualified or not is detected by driving the nut to rotate and move downwards so as to be in threaded connection with the screw, and when the phenomenon that the screw thread of the screw is clamped is detected, the screw thread on the outer circular surface of the screw can be locally polished by sand blasting, so that the condition that the qualified part of the screw thread is polished and damaged to become unqualified is avoided, and the nut is better in threaded connection with the screw.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an enlarged schematic view of a in fig. 1.

Fig. 3 is an enlarged structural diagram of B in fig. 2.

Fig. 4 is an enlarged schematic view of C in fig. 1.

Fig. 5 is an enlarged schematic view of D in fig. 4.

Fig. 6 is an enlarged schematic view of E in fig. 4.

Detailed Description

The invention will now be described in detail with reference to fig. 1-6, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below coincide with the up, down, left, right, and front-back directions in the projection relation of fig. 1 itself.

The invention relates to a local grinding device for unqualified threads, which comprises a grinding box 11, wherein a grinding cavity 12 is arranged in the grinding box 11, sliding plates 13 are vertically and slidably connected to the left and right walls of the grinding cavity 12, a gear ring block 14 is rotatably connected in the sliding plates 13, a vertically through clamping cavity 16 is arranged in the gear ring block 14, the left and right side walls of the clamping cavity 16 are vertically and slidably connected with symmetrical clamping boxes 43, the upper and lower ends of the left and right side walls of the clamping cavity 16 are fixedly connected with limit blocks 78, a transmission cavity 47 which is positioned at the right side of the clamping cavity 16 and has a left opening is arranged in the sliding plates 13, a contact switch cavity 55 is communicated with the lower wall of the transmission cavity 47, a sliding block 56 is horizontally and slidably connected with the lower wall of the contact switch cavity 55, a gear shaft 49 which extends upwards into the transmission cavity 47 is rotatably connected with the upper end surface of the sliding block 56, and a movable screw 21 which penetrates through the transmission cavity 47 is rotatably connected with the right end of the upper and lower walls of the grinding cavity 12, the part of the movable screw 21 penetrating through the sliding plate 13 is in threaded connection with the sliding plate 13, the lower end surface of the sliding plate 13 is fixedly connected with a sand-blasting box 50 positioned right below the contact switch cavity 55, a sand-storing cavity 51 is arranged in the sand-blasting box 50, a sand-blasting cavity 54 is arranged on the lower side of the sand-storing cavity 51, a water pipe 74 is communicated with the right wall of the sand-blasting cavity 54, a water pump 73 is fixedly arranged on the right side of the water pipe 74, a communicating cavity 64 is communicated between the lower wall of the sand-storing cavity 51 and the upper wall of the sand-blasting cavity 54, a connecting rod cavity 66 is communicated with the right wall of the communicating cavity 64, a closing plate 65 capable of closing the communicating cavity 64 is connected on the upper and lower walls of the connecting rod cavity 66 in a left-right sliding manner, a crank wheel cavity 69 positioned on the right side of the sand-storing cavity 51 is communicated with the upper wall of the grinding cavity 12, a bearing block 24 is fixedly connected with the lower wall of the grinding cavity 12, and a bevel gear cavity 28 with an upward opening is arranged in the bearing block 24, bevel gear chamber 28 left and right sides wall rotates to be connected and extends to respectively to the left and right sides the tight screw 25 of the tight screw 25 that just symmetry about the supporting block 24, tight screw 25 is located the outer disc threaded connection in one side outside the supporting block 24 with the tight piece 26 of arc clamp of the lower wall side to side sliding connection of polishing chamber 12, sliding connection has the release piece 29 about bevel gear chamber 28.

Beneficially, the clamping box 43 is internally provided with a clamping spring cavity 44 on the left side and the right side, the upper wall and the lower wall of the clamping spring cavity 44 are connected with a clamping push plate 46 in a left-right sliding manner, one side end face of the clamping push plate 46, which is close to each other, is fixedly connected with a protruding block 75 which extends out of the clamping spring cavity 44 to one side close to each other, a side end face of the clamping push plate 46, which is away from each other, and a side wall of the clamping spring cavity 44, which is away from each other, are fixedly connected with a clamping spring 45, one side end face of the protruding block 75, which is close to each other, is fixedly connected with a bottom plate 20, the upper end face of the bottom plate 20 is placed with a nut 18, and a nut cavity 19 which is through up and down is arranged in the nut 18.

Advantageously, the gear ring 15 is fixedly arranged on the outer circular surface of the gear ring block 14, the moving gear 48 in meshing transmission with the gear ring 15 is fixedly connected to the outer circular surface of the gear shaft 49, the switch plate 58 positioned on the right side of the sliding block 56 is fixedly connected to the lower wall of the contact switch cavity 55, the switch spring 57 is fixedly connected between the left end surface of the switch plate 58 and the right end surface of the sliding block 56, the contact switch 76 positioned on the upper side of the switch spring 57 is fixedly connected to the left end surface of the switch plate 58, the bidirectional power device 59 positioned on the right side of the switch plate 58 is fixedly arranged on the lower wall of the contact switch cavity 55, the upper end surface of the bidirectional power device 59 is in power connection with the upper power shaft 60 extending upwards into the transmission cavity 47, the sleeve 61 is in power key connection with the outer circular surface of one side of the moving screw 21 positioned in the transmission cavity 47, and the outer circular surface of the gear shaft 49 positioned on the lower side of the moving gear 48 and the outer circular surfaces of the upper power shaft 60 and the sleeve 61 are both fixedly connected The belt wheels 62 are fixedly connected, and belts 63 are wound among the three belt wheels 62.

Advantageously, the lower end surface of the bidirectional power device 59 is in power connection with a lower side power shaft 52 extending downward into the crank wheel cavity 69, the outer circular surface of the lower side power shaft 52 is fixedly connected with a crank wheel 70, the upper end surface of the crank wheel 70 is in rotational connection with a connecting shaft 71 extending downward into the connecting rod cavity 66, one side outer circular surface of the connecting shaft 71 located in the connecting rod cavity 66 is in rotational connection with a connecting rod 68, the upper end surface of the connecting rod 68 is in rotational connection with a connecting shaft 72 extending downward to the lower side of the connecting rod 68, the outer circular surface of the connecting shaft 72 is in rotational connection with a hinge rod 67, the left end surface of the hinge rod 67 is hinged with the right end surface of the closing plate 65, and the left end surface of the sand-blasting box 50 is fixedly connected with a spray nozzle 53 communicating with the left side of the sand-blasting cavity 54.

Advantageously, the end faces of the arc-shaped clamping blocks 26 at the sides far away from each other are fixedly connected with baffle plates 27, a clamping motor 23 is fixedly arranged on the lower wall of the grinding cavity 12, a motor shaft 32 extending upwards into the bevel gear cavity 28 is dynamically connected to the upper end surface of the clamping motor 23, a clutch shaft sleeve 35 is arranged on the upper side of the motor shaft 32, a clutch cavity 36 is communicated with the lower end surface of the clutch shaft sleeve 35, the clutch cavity 36 is connected with the motor shaft 32 by a spline, the upper end surface of the clutch shaft sleeve 35 is communicated with a clutch gear cavity 40, an annular clutch gear ring 42 is fixedly connected in the clutch gear cavity 40, an internal thread cavity 31 with a downward opening is arranged in the push-out block 29, the internally threaded cavity 31 is internally threaded with a push shaft 30 extending downwardly into the clutch gear cavity 40, a clutch gear 41 is fixedly connected to the outer circular surface of one side of the pushing shaft 30, which is located in the clutch gear cavity 40.

Beneficially, a clutch spring 38 with a top end abutting against the upper wall of the clutch cavity 36 is fixedly connected to the upper end face of the motor shaft 32, an electromagnet 37 located on the right side of the clutch spring 38 is fixedly connected to the upper end face of the motor shaft 32, a magnetic block 39 corresponding to the electromagnet 37 is fixedly connected to the upper end face of the clutch cavity 36, a driving bevel gear 34 is fixedly connected to an outer circular face of the clutch shaft sleeve 35, a driven bevel gear 33 capable of being in meshing transmission with the driving bevel gear 34 is fixedly connected to outer circular faces of one side of the left and right clamping screws 25 located in the bevel gear cavity 28, and a screw 22 is placed on the upper end face of the bearing block 24.

The use steps herein are described in detail below with reference to fig. 1-6:

in the initial state: thereby it presss from both sides tightly to stretch out piece 75 through the clamp plate 17 with nut 18 to promote through the clamp spring 45 of the left and right sides, terminal surface and bottom plate 20 up end paste tightly under the nut 18, the tight piece 26 of left and right sides arc clamp tightly the screw 22, terminal surface and the bearing piece 24 up end paste tightly under the screw 22, switch spring 57 is in the state of relaxing, clutch spring 38 is in the state of relaxing, clutch gear 41 is in the separation mode with separation and reunion ring gear 42, the tight case 43 of left and right sides clamp is located downside stopper 78 up end, it is equipped with the abrasive material to put in the sand storage chamber 51.

In operation, the bi-directional power device 59 is activated to rotate the upper power shaft 60, the middle belt pulley 62 is rotated by the rotation of the upper power shaft 60, the left and right belt pulleys 62 are rotated by the transmission of the belt 63, the sleeve 61 is rotated by the rotation of the right belt pulley 62, the movable screw 21 is rotated by the rotation of the sleeve 61 through the spline connection, the sliding plate 13 is driven to slide downward by the threaded connection, the gear shaft 49 is driven to rotate by the rotation of the left belt pulley 62, the movable gear 48 is driven to rotate, the ring gear block 14 is driven to rotate by the meshing transmission with the ring gear 15, the nut 18 is driven to rotate by the clamping of the left and right clamping plates 17, when the sliding plate 13 moves downward to be close to the screw 22, the nut cavity 19 can be connected with the screw 22 by the thread and move downward continuously, and when the nut cavity 19 is blocked with the screw 22 and cannot move downward continuously, the moving gear 48 is not engaged with the ring gear 15 and is pushed rightward, thereby driving the sliding block 56 to tighten the switch spring 57 and contact with the contact switch 76, the contact switch 76 is contacted to drive the bidirectional power device 59 to start reversely, thereby driving the upper power shaft 60 to rotate reversely, at this time, the sliding plate 13 is driven to move upward for a certain distance by the threaded connection of the sliding plate 13 and the moving screw 21, and then the upper power shaft 60 is rotated again to drive the sliding plate 13 to move downward, at the same time, the bidirectional power device 59 drives the lower power shaft 52 to rotate, the crank wheel 70 is driven to rotate by the rotation of the lower power shaft 52, the connecting shaft 71 is driven to rotate by the rotation of the crank wheel 70, thereby the connecting rod 68 is driven to swing by the rotational connection, at this time, the hinge rod 67 is driven to swing by the connection of the connecting shaft 72, thereby the closing plate 65 is driven to reciprocate left and right by the hinge with the closing plate 65, thereby intermittently communicating the communicating chamber 64, at the same time, the abrasive in the sand storage chamber 51 can intermittently drop downwards into the sand blasting chamber 54 through the communication of the communicating chamber 64, at the same time, the water pump 73 is started to flush water into the sand blasting chamber 54 through the water pipe 74, thereby driving the abrasive in the sand blasting chamber 54 to be sprayed leftwards through the spray nozzle 53 to grind the screw 22, after the screw 22 is ground for a certain length, the bidirectional power device 59 drives the lower side power shaft 52 to stop and close the water pump 73, at the moment, if the abrasive can be continuously engaged with the nut chamber 19 through the grinding screw 22, the sliding plate 13 moves downwards, if the abrasive still can not be engaged, the grinding action is repeated, when the sliding plate 13 moves to be close to the arc-shaped clamping block 26, the electromagnet 37 is started, thereby adsorbing the magnetic block 39 moves downwards and tightening the clutch spring 38, at the moment, the driving bevel gear 34 is disengaged from the driven bevel gear 33 and drives the clutch gear ring 42 to move downwards to be engaged with the clutch gear 41, at this moment, the clamping motor 23 is started to drive the motor shaft 32 to rotate, the clutch shaft sleeve 35 is driven to rotate through key connection, the driving pushing shaft 30 is driven to rotate, the pushing block 29 is driven to move upwards through threaded connection through rotation of the pushing shaft 30, the clamping force of the left and right arc-shaped clamping blocks 26 is driven to move upwards through pushing the screw 22, the nut cavity 19 can be completely in threaded connection with the screw 22 conveniently, after the nut cavity 19 and the screw 22 are detected, the electromagnet 37 and the magnetic block 39 are disconnected, the driving bevel gear 34 is driven to be meshed with the left and right driven bevel gears 33, the clamping screw rods 25 on the left and right sides are driven to rotate through rotation of the motor shaft 32, and the left and right arc-shaped clamping blocks 26 are driven to be away from each other through threaded connection, so that the screw 22 is loosened.

The above embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention by this. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. The utility model provides a local grinding device of unqualified screw thread, includes the case of polishing, its characterized in that: a grinding cavity is arranged in the grinding box, the left wall and the right wall of the grinding cavity are vertically and slidably connected with a sliding plate, a gear ring block is rotationally connected with the sliding plate, a vertically through clamping cavity is arranged in the gear ring block, the left side wall and the right side wall of the clamping cavity are vertically and slidably connected with symmetrical clamping boxes, the upper ends and the lower ends of the left side wall and the right side wall of the clamping cavity are fixedly connected with limit blocks, a transmission cavity which is positioned at the right side of the clamping cavity and is provided with a leftward opening is arranged in the sliding plate, the lower wall of the transmission cavity is communicated with a contact switch cavity, the lower wall of the contact switch cavity is horizontally and slidably connected with sliding blocks, the upper end surface of each sliding block is rotatably connected with a gear shaft which extends upwards into the transmission cavity, the right end of the upper wall and the lower wall of the grinding cavity is rotatably connected with a moving screw rod which penetrates through the transmission cavity, and the part of the moving screw rod, which penetrates through the sliding plate, is in threaded connection with the sliding plate, the end face fixedly connected with under the sliding plate is located the sand-blasting box under the contact switch chamber, be equipped with the sand storage chamber in the sand-blasting box, sand storage chamber downside is equipped with the sand-blasting chamber, sand-blasting chamber right wall intercommunication is equipped with the water pipe, the fixed water pump that is equipped with in water pipe right side, sand storage chamber lower wall with intercommunication is equipped with the intercommunication chamber between the sand-blasting chamber upper wall, intercommunication chamber right wall intercommunication is equipped with the connecting rod chamber, lower wall horizontal sliding connection has the closing plate that can seal the intercommunication chamber on the connecting rod chamber, connecting rod chamber upper wall intercommunication is equipped with the crank wheel chamber that is located sand storage chamber right side, it has the bearing block to polish chamber lower wall fixedly connected with, be equipped with the ascending bevel gear chamber of opening in the bearing block, bevel gear chamber left and right sides wall rotates to connect and extends to the left and right sides respectively the clamping screw that the bearing block left and right sides just symmetry, clamping screw is located one side outer disc thread connection outside the bearing block with the lower wall chamber is polished The bevel gear cavity is vertically and slidably connected with a pushing-out block; clamping spring cavities are arranged in the clamping boxes on the left side and the right side, clamping push plates are connected to the upper wall and the lower wall of each clamping spring cavity in a left-right sliding mode, the end face, close to each other, of one side of each clamping push plate is fixedly connected with an extending block extending out of the clamping spring cavity towards the side close to each other, a clamping spring is fixedly connected between the end face, far away from each clamping push plate, of one side of each clamping push plate and the side wall, far away from each clamping spring cavity, one end face, close to each other, of each extending block is fixedly connected with a clamping plate, the bottom end, close to each clamping plate, of one end face is fixedly connected with a bottom plate, nuts are placed on the upper end faces of the left bottom plate and the right bottom plate, and nut cavities which are communicated up and down are arranged in the nuts; the gear ring block is fixedly provided with a gear ring on the outer circular surface, the gear shaft outer circular surface is fixedly connected with a movable gear which is meshed with the gear ring for transmission, the contact switch cavity lower wall is fixedly connected with a switch board which is positioned on the right side of the sliding block, a switch spring is fixedly connected between the switch board left end surface and the sliding block right end surface, the switch board left end surface is fixedly connected with a contact switch which is positioned on the upper side of the switch spring, the contact switch cavity lower wall is fixedly provided with a bidirectional power device which is positioned on the right side of the switch board, the upper end surface of the bidirectional power device is in power connection with an upper side power shaft which extends upwards into the transmission cavity, one side outer circular surface key of the movable screw rod which is positioned in the transmission cavity is connected with a sleeve, the outer circular surface of the gear shaft which is positioned on the lower side of the movable gear and the upper side power shaft and the outer circular surface of the sleeve are both fixedly connected with belt wheels, a belt is wound among the three belt wheels; the lower end surface of the bidirectional power device is in power connection with a lower side power shaft extending downwards into the crank wheel cavity, the outer circular surface of the lower side power shaft is fixedly connected with a crank wheel, the upper end surface of the crank wheel is in rotary connection with a connecting shaft extending downwards into the connecting rod cavity, the outer circular surface of one side of the connecting shaft, which is positioned in the connecting rod cavity, is in rotary connection with a connecting rod, the upper end surface of the connecting rod is in rotary connection with a connecting shaft extending downwards to the lower side of the connecting rod, the outer circular surface of the connecting shaft is in rotary connection with a hinge rod, the left end surface of the hinge rod is hinged with the right end surface of the sealing plate, and the left end surface of the sand blasting box is fixedly connected with a spray head communicated with the left side of the sand blasting cavity; the end face of one side, away from each other, of each arc-shaped clamping block is fixedly connected with a baffle plate, the lower wall of the polishing cavity is fixedly provided with a clamping motor, the upper end face of the clamping motor is in power connection with a motor shaft extending upwards into the bevel gear cavity, the upper side of the motor shaft is provided with a clutch shaft sleeve, the lower end face of the clutch shaft sleeve is communicated with a clutch cavity, the clutch cavity is in splined connection with the motor shaft, the upper end face of the clutch shaft sleeve is communicated with a clutch gear cavity, an annular clutch gear ring is fixedly connected into the clutch gear cavity, an internal thread cavity with a downward opening is arranged in the push-out block, a push shaft extending downwards into the clutch gear cavity is in threaded connection with the internal thread cavity, and the outer circular face of one side, located in the clutch gear cavity, of the push shaft is fixedly connected with a clutch gear; the clutch mechanism comprises a clutch shaft, a clutch cavity, a clamping screw, a driving bevel gear, a driven bevel gear and a bearing block, wherein the top end of the upper end surface of the motor shaft is fixedly connected with a clutch spring, the top end of the clutch spring is abutted against the upper wall of the clutch cavity, the upper end surface of the motor shaft is fixedly connected with an electromagnet positioned on the right side of the clutch spring, the upper end surface of the clutch cavity is fixedly connected with a magnetic block corresponding to the electromagnet, the outer circular surface of the clutch shaft sleeve is fixedly connected with the driving bevel gear, the outer circular surface of one side, positioned in the bevel gear cavity, of the left clamping screw is fixedly connected with the driven bevel gear which can be in meshing transmission with the driving bevel gear, and the upper end surface of the bearing block is provided with a screw.