Threaded insert disassembly device

Abstract

The present invention relates to the technical field of portable motor tools, and specifically to a threaded insert disassembly device, comprising a chassis and a drive assembly, wherein the top of the chassis is provided with an embedding groove for clamping the parts to be disassembled, the drive assembly comprises a drive motor and a plurality of disassembly shafts, the upper end of each disassembly shaft is fixed with a sleeve for sleeved on the periphery of the threaded insert, the sleeve is provided with a clamping assembly for clamping the threaded insert, the clamping assembly comprises a plurality of clamping blocks, each clamping block is respectively arranged to move along the radial direction of the sleeve, and each clamping block has an initial position, a clamping position and an escape position on its movable path, when the threaded insert is inserted into the sleeve, the threaded insert pushes each clamping block outward along the radial direction of the sleeve to the escape position, and when the clamping block is at the clamping position, the clamping surface fits with the outer hexagonal side surface of the threaded insert. The present invention solves the technical problems in the prior art that the bolt disassembly efficiency is low, and the bolt and the product are easily damaged when the rusty bolt is disassembled by using an electric wrench.

Description

Technical Field

[0001] The invention relates to the technical field of portable motor tools, and in particular to a threaded insert disassembly device. Background Art

[0002] In the prior art, when removing threaded inserts such as bolts and studs on a product, workers generally use electric wrenches to unscrew the threaded inserts on the product one by one. However, there are often multiple threaded inserts on a product. This method of removing threaded inserts one by one is not only slow, but also has low removal efficiency. In addition, among the multiple threaded inserts on the same product, some threaded inserts may be rusted. If an electric wrench is used to remove them forcibly, the threaded inserts and the product may be damaged. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention proposes a threaded insert disassembly device to solve the technical problems in the prior art of low bolt disassembly efficiency and easy damage to the bolts and products when using an electric wrench to disassemble rusted bolts.

[0004] A threaded insert disassembly device of the present invention adopts the following technical solution:

[0005] A threaded insert disassembly device comprises a chassis and a driving assembly arranged in the chassis, wherein the top of the chassis is provided with an embedding groove for clamping the parts to be disassembled, the driving assembly comprises a driving motor and a plurality of disassembly shafts, the disassembly shafts are arranged in parallel and spaced apart, and the axes all extend in the up-down direction, a sleeve for sleeved around the periphery of the threaded insert is fixed to the upper end of each disassembly shaft, a clamping assembly for clamping the threaded insert is arranged in the sleeve, the clamping assembly comprises a plurality of clamping blocks, the plurality of clamping blocks are evenly distributed along the circumference of the sleeve, and each clamping block has a plurality of outer hexagonal clamps for clamping the threaded insert. The clamping surface is fitted on the side, and each clamping block is respectively arranged to move along the radial direction of the sleeve. The movable path of each clamping block has an initial position, a clamping position and an avoidance position. The clamping position is located between the initial position and the avoidance position. When the threaded insert is inserted into the sleeve, the threaded insert pushes each clamping block outward along the radial direction of the sleeve to the avoidance position. When the clamping block is in the clamping position, the clamping surface is fitted with the outer hexagonal side of the threaded insert. The driving motor is respectively connected to each disassembly shaft to drive each disassembly shaft to rotate.

[0006] Furthermore, the clamping assembly also includes a movable block arranged in a one-to-one correspondence with the clamping blocks, the movable blocks and the corresponding clamping blocks are distributed along the radial direction of the sleeve, the clamping block is located on the side of the movable block facing the center of the sleeve, a slot is opened on the side of the movable block facing the center of the sleeve, and a plug-in column is provided on the side of the clamping block facing the movable block, the plug-in column is movably inserted in the slot, and a first compression spring is provided in the slot, and two ends of the first compression spring are respectively press-fitted with the bottom of the slot and the top of the plug-in column, so that each clamping block is close to each other toward the center of the sleeve when in the initial position.

[0007] Furthermore, a spur rack is provided on the inner wall of the slot, and a one-way ratchet bar for engaging with the spur rack is floatingly provided on the outer peripheral wall of the plug-in column, and the one-way ratchet bar is separated from the spur rack when the clamping block is in the initial position, so that the threaded insert can push the clamping block outward along the radial direction of the sleeve when it is inserted into the sleeve, and a support rod extending along the radial direction of the sleeve is provided in the slot, and a sleeve is rotatably provided on the support rod, and an annular groove is opened on the outer side wall of the sleeve, and the annular groove is a parallelogram, and the annular groove includes a first parallel arrangement The straight groove and the second straight groove also include a first oblique groove and a second oblique groove arranged in parallel, the first straight groove, the first oblique groove, the second straight groove and the second oblique groove are connected end to end in sequence to form a parallelogram, the first straight groove and the second straight groove extend along the axial direction of the support rod, the first oblique groove and the second oblique groove are respectively located at the two ends of the first straight groove and the second straight groove, the groove depth of the first straight groove is greater than the groove depth of the second straight groove, the groove depth of the first oblique groove and the second oblique groove gradually decreases from the first straight groove to the second straight groove, the plug-in column is provided with a plug hole, the sleeve The end facing the center of the sleeve extends into the socket, and the annular groove is located inside the socket. A push rod is connected to the side of the one-way ratchet bar that faces away from the straight rack, and the axis of the push rod is perpendicular to the axis of the sleeve. The push rod is movably inserted in the plug-in column along its own axial direction, and the end of the push rod away from the one-way ratchet bar extends into the annular groove. When the clamping block is in the initial position, the push rod is located at one end of the first straight groove close to the clamping block. When the threaded insert pushes the clamping block radially outward along the sleeve, the clamping block drives the push rod to move along the first straight groove. When the clamping block reaches the avoidance position, the push rod moves into the second oblique groove, and then the clamping block moves toward the center of the sleeve under the pushing action of the first compression spring, so that the push rod drives the sleeve to rotate along the second oblique groove until the push rod enters the second straight groove. When the push rod moves into the second straight groove, the push rod axially pushes the one-way ratchet bar to move toward the straight rack, so that the one-way ratchet bar engages with the straight rack. At this time, the clamping block is in the clamping position, and the clamping block can only move toward the center of the sleeve but cannot move in a direction away from the center of the sleeve.

[0008] Furthermore, a first mounting groove is opened on the outer peripheral wall of the plug-in column, the one-way ratchet bar is located in the first mounting groove, and a first tension spring is connected between the one-way ratchet bar and the first mounting groove. When the clamping block is in the initial position, the first tension spring drives the one-way ratchet bar to separate from the spur rack.

[0009] Furthermore, an insertion hole is provided on the side of the one-way ratchet bar facing away from the spur rack, one end of the push rod is inserted into the insertion hole, a second compression spring is provided in the insertion hole, and both ends of the second compression spring are respectively pressed into cooperation with the push rod and the one-way ratchet bar.

[0010] Further, the sleeve includes a side wall and a bottom wall, a first annular groove is provided on the bottom wall of the sleeve, the first annular groove is coaxially arranged with the sleeve, a radial straight groove corresponding to the movable block is also provided on the bottom wall of the sleeve, the radial straight groove extends along the radial direction of the sleeve, the radial straight groove is located at the periphery of the first annular groove, and one end of the radial straight groove is connected with the first annular groove, a guide protrusion is provided at the lower end of the movable block, the guide protrusion is guided in the first annular groove, and a second mounting groove is provided on the side of the guide protrusion away from the clamping block, A locking block is movably installed in the second mounting groove by a third compression spring. The locking block can move radially along the sleeve in the second mounting groove. The locking block extends into the radial straight groove to prevent the movable block from moving in the first annular groove. Guide slopes are respectively provided on opposite sides of the locking block. When the threaded insert is rusted, the resistance of the threaded insert to the clamping block increases, and the locking block is squeezed by the side wall of the radial straight groove and retracts into the second mounting groove. The locking block releases the blockage of the movable block, and the movable block moves circumferentially along the first annular groove when the sleeve rotates.

[0011] Furthermore, a damping assembly is provided in the radial straight groove, one end of the damping assembly is fixedly connected to the side wall of the sleeve, and the other end is located in the radial straight groove and can be extended and retracted along the radial straight groove. In the initial state, the locking block is pressed into the damping assembly, and when the locking block is retracted into the second installation groove, the damping assembly is extended.

[0012] Furthermore, a second annular groove is provided on the bottom wall of the sleeve, and a supporting protrusion is provided at the lower end of the movable block, and the supporting protrusion is located in the second annular groove, and the lower end of the supporting protrusion is supported and cooperated with the bottom of the second annular groove, and the bottom of the second annular groove is a corrugated surface, and the corrugated surface includes a crest section, a trough section and a plane section, and the plane sections are arranged one-to-one with the radial straight grooves, and there are multiple crest sections and trough sections and the number is the same, and the crest sections and trough sections are alternately distributed along the circumference of the second annular groove, and each plane section is respectively located between adjacent crest sections and trough sections, and when the movable block moves along the circumference of the first annular groove, the supporting protrusion moves along the corrugated surface so that the movable block moves back and forth up and down.

[0013] Furthermore, a lower pressure plate is floatingly provided at the upper end of the movable block, at least one guide hole is opened at the upper end of the movable block, a fifth compression spring is provided in the guide hole, a guide rod is provided at the lower side of the lower pressure plate, the guide rod is guided and inserted in the guide hole, two ends of the fifth compression spring are respectively press-fitted with the movable block and the guide rod, the chassis includes a first mold frame, a second mold frame and a third mold frame which are arranged in sequence from top to bottom, the driving assembly is installed between the second mold frame and the third mold frame, the upper side of the lower pressure plate is press-fitted with the second mold frame, and the parts to be disassembled are clamped on the first mold frame.

[0014] Furthermore, a plurality of clamping rollers are rotatably provided on the clamping surface of each clamping block, and the plurality of clamping rollers are arranged in parallel and evenly spaced in the up-and-down directions, and the clamping rollers include a rotating shaft and a roller sleeved on the rotating shaft, and the rotating shaft is rotatably provided on the clamping block, and a one-way clutch is provided between the roller and the rotating shaft, and the transmission directions of the one-way clutches between two adjacent rotating shafts and the rollers are opposite, and the two ends of each rotating shaft are respectively connected to limit gears, and the clamping block is respectively provided with limit gear rings at the two ends of the rotating shaft for cooperating with the limit gears one by one, and the limit gear rings are movably provided on the clamping block, and a top pressure is provided between the limit gear ring and the clamping block. A third compression spring is provided, and side pressure plates are floatingly provided on opposite sides of the clamping block, and one end of each limit gear ring away from the limit gear is provided with a top pressure inclined surface for extrusion and cooperation with the side pressure plate, and a fourth compression spring is provided for pressing between the side pressure plate and the clamping block. When the clamping block is in the initial position, the side pressure plates between the clamping blocks are pressed against each other, and each side pressure plate respectively squeezes the corresponding limit gear ring, so that the limit gear ring overcomes the force of the third compression spring and cooperates with the limit gear sleeve; when the clamping block is in the avoidance position, the side pressure plate releases the extrusion effect on the limit gear ring under the action of the fourth compression spring, and the limit gear ring is separated from the limit gear ring under the action of the third compression spring.

[0015] The beneficial effects of the present invention are as follows: a threaded insert disassembly device of the present invention utilizes multiple disassembly shafts to cooperate with multiple threaded inserts on a part respectively, and each clamping block of the clamping assembly clamps the threaded insert respectively. When the driving motor drives the disassembly shaft to rotate, the clamping block clamps the threaded insert and rotates, thereby unscrewing the threaded insert, which can improve the disassembly efficiency.

[0016] Furthermore, the clamping assembly in the present invention includes a clamping block and a movable block. The movable block utilizes transmission between a locking block and a sleeve. When the threaded insert is rusted and difficult to unscrew, the movable block and the sleeve release transmission, so that the disassembly shaft idles without unscrewing the rusted threaded insert, thereby avoiding damage to the rusted threaded insert.

[0017] Furthermore, for rusty threaded inserts, the movable block and the clamping block can reciprocate up and down, and the clamping block can clean the rust on the outside of the threaded insert, making it convenient for subsequent manual screwing of the threaded insert. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a three-dimensional schematic diagram of the cooperation between an embodiment of a threaded insert disassembly device of the present invention and its parts;

[0020] Figure 2 An exploded view of an embodiment of a threaded insert disassembly device of the present invention and its parts;

[0021] Figure 3 A three-dimensional schematic diagram of a driving assembly in an embodiment of a threaded insert removal device of the present invention;

[0022] Figure 4 It is a three-dimensional schematic diagram of disassembling a rotating shaft in one embodiment of a threaded insert disassembling device of the present invention;

[0023] Figure 5 It is a front view of a disassembly shaft in one embodiment of a threaded insert disassembly device of the present invention;

[0024] Figure 6 for Figure 5 Middle BB section view;

[0025] Figure 7 for Figure 6 A magnified schematic diagram of the local X in the middle;

[0026] Figure 8 for Figure 7 A magnified schematic diagram of the local Y in the middle;

[0027] Fig. 9 An exploded view of disassembling a rotating shaft in one embodiment of a threaded insert disassembling device of the present invention;

[0028] Fig.10 for Fig. 9 A magnified schematic diagram of the local Z in the middle;

[0029] Fig.11 An exploded view of disassembling a clamping assembly in a rotating shaft in one embodiment of a threaded insert disassembling device of the present invention;

[0030] Fig.12An exploded view of a threaded insert disassembly device according to an embodiment of the present invention for disassembling a clamping block in a rotating shaft;

[0031] Fig.13 for Fig.12 A magnified schematic diagram of the local W in the middle;

[0032] Fig.14 A cross-sectional view of a clamping block in an embodiment of a threaded insert removal device of the present invention;

[0033] Fig.15 The present invention is a cross-sectional view of a sleeve in an embodiment of a threaded insert removal device.

[0034] In the figure: 100, parts; 110, threaded inserts; 200, chassis; 210, first mold frame; 220, second mold frame; 230, third mold frame; 240, fourth mold frame; 300, drive assembly; 310, drive motor; 320, intermediate gear; 321, transmission gear; 330, disassembly shaft; 331, radial straight groove; 332, first annular groove; 333, first groove section; 334, peak section; 335, trough section; 336, second groove section; 337, second annular groove; 400, clamping assembly; 410, movable block; 411, second mounting groove; 412, support protrusion; 413, spur rack; 414, support rod; 415, limit slot; 416, guide protrusion; 420, damping assembly; 430, locking block; 440, lower pressure plate; 450, sleeve; 451, elastic strip; 452, first straight slot; 453, second straight slot; 454, first oblique slot; 455, second oblique slot; 460, clamping block; 461, first mounting slot; 462, first compression spring; 463, third mounting slot; 470, one-way ratchet bar; 471, push rod; 472, first tension spring; 473, second compression spring; 480, side pressure plate; 490, clamping roller; 491, roller; 492, rotating shaft; 4921, limit gear; 493, limit gear ring; 4932, slider. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] An embodiment of a threaded insert removal device of the present invention is as follows Figures 1 to 15As shown, the threaded insert removal device includes a chassis 200 and a driving assembly 300 disposed in the chassis 200. In this embodiment, the chassis 200 includes a first mold frame 210, a second mold frame 220 and a third mold frame 230 arranged in sequence from top to bottom, and also includes a fourth mold frame 240 located at the bottom. A lower fastening rod is fixed on the upper side of the fourth mold frame 240. The first mold frame 210, the second mold frame 220 and the third mold frame 230 are respectively provided with through holes for the lower fastening rod to pass through. The first mold frame 210, the second mold frame 220, the third mold frame 230 and the fourth mold frame 240 are fastened together by screwing the fastening bolts on the upper end of the lower fastening rod. At the same time, an upper fastening rod is provided on the lower side of the first mold frame 210, and through holes for the upper fastening rod to pass through are provided on the second mold frame 220, the third mold frame 230 and the fourth mold frame 240, respectively. The first mold frame 210, the second mold frame 220, the third mold frame 230 and the fourth mold frame 240 are fastened together by screwing the fastening bolts on the lower end of the upper fastening rod. A drive assembly 300 accommodating groove is provided on the upper side of the third mold frame 230, and the drive assembly 300 is installed between the second mold frame 220 and the third mold frame 230. The top of the first mold frame 210 of the chassis 200 is provided with a groove for clamping the part 100 to be disassembled. When the threaded insert 110 on the part 100 needs to be disassembled, the part 100 is fixed in the groove, and the threaded insert 110 on the part 100 will pass downward through the second mold frame 220 and cooperate with the driving assembly 300 between the second mold frame 220 and the first mold frame 210. The driving assembly 300 drives the threaded insert 110 to rotate and then unscrews the threaded insert 110 from the part 100.

[0037] In the present invention, the driving assembly 300 includes a driving motor 310 and a plurality of disassembly shafts 330, and the driving motor 310 is in transmission connection with the plurality of disassembly shafts 330 to drive the disassembly shafts 330 to rotate. In this embodiment, two embedding grooves for clamping the parts 100 are provided on the first mold frame 210, and two parts 100 can be clamped on the first mold frame 210 at the same time when in use. Correspondingly, the disassembly shafts 330 are symmetrically arranged in two groups, each group has four disassembly shafts 330, and the four disassembly shafts 330 in each group correspond to the four threaded inserts 110 on the parts 100 one by one. When in use, the four threaded inserts 110 on each part 100 are respectively matched with the upper ends of the disassembly shafts 330, and the rotation of the disassembly shafts 330 drives the respective threaded inserts 110 to rotate, and the threaded inserts 110 are screwed off from the parts 100. The provision of multiple disassembly shafts 330 can improve the disassembly efficiency.

[0038] The four disassembly shafts 330 of each group are arranged in parallel and spaced apart, and the axes all extend in the up-down direction. A transmission shaft is respectively arranged between the four disassembly shafts 330 of each group, and the transmission shaft is provided with an intermediate gear 320. The four disassembly shafts 330 of each group are distributed around the intermediate gear 320, and a transmission gear 321 is fixed at the lower end of each disassembly shaft 330, and each transmission gear 321 is respectively meshed with the intermediate gear 320 for transmission. The drive motor 310 is located between the left and right groups of disassembly shafts 330, and the output shaft of the drive motor 310 is connected with a drive gear, and the drive gear is respectively meshed with the intermediate gears 320 on the left and right sides for transmission, thereby realizing the transmission connection between the drive motor 310 and each disassembly shaft 330.

[0039] In the present invention, a sleeve for sleeve-covering the outer periphery of the threaded insert 110 is fixed to the upper end of each disassembly shaft 330, and a clamping assembly 400 for clamping the threaded insert 110 is arranged in the sleeve. The clamping assembly 400 includes a plurality of clamping blocks 460. In this embodiment, the number of the clamping blocks 460 is six. Since the outer periphery of the existing threaded insert 110 is usually an outer hexagonal side surface, by setting the number of the clamping blocks 460 to six, the six clamping blocks 460 form an inner hexagonal tube. In this way, after the threaded insert 110 is inserted into the sleeve, each clamping block 460 is respectively fitted with the outer hexagonal side surface of the threaded insert 110 in a one-to-one correspondence, thereby being able to clamp the threaded insert 110 and drive the threaded insert 110 to rotate. In other embodiments, the number of the clamping blocks 460 can be determined according to the outer periphery shape of the threaded insert 110, such as three, four, five, etc.

[0040] In the present invention, six clamping blocks 460 are evenly distributed along the circumference of the sleeve, and each clamping block 460 has a clamping surface for fitting with the outer hexagonal side surface of the threaded insert 110. Each clamping block 460 is movably arranged along the radial direction of the sleeve, and each clamping block 460 has an initial position, a clamping position and an escape position on its movable path, and the clamping position is located between the initial position and the escape position. When each clamping block 460 is at the initial position, it moves toward the center of the sleeve to form an inner hexagonal tube. In the initial state, the inner diameter of the inner hexagonal tube formed by the six clamping blocks 460 is smaller than the outer diameter of the outer hexagon of the threaded insert 110. The upper end of each clamping block 460 is provided with a guide wedge surface, so that the upper end of the inner hexagonal tube formed by each clamping block 460 close to each other is a flared structure. When the threaded insert 110 is inserted into the sleeve, the guide wedge surface can guide the threaded insert 110 to enter between the clamping blocks 460 and make the threaded insert 110 push each clamping block 460 outward. If the outer hexagonal side surface of the threaded insert 110 and the clamping surface of the clamping block 460 are misaligned, the threaded insert 110 pushes each clamping block 460 outward along the radial direction of the sleeve to the avoidance position, and the clamping block 460 is located in the clamping position when the clamping surface fits the outer hexagonal side surface of the threaded insert 110.

[0041] In this embodiment, the clamping assembly 400 further includes a movable block 410 corresponding to the clamping block 460. The movable block 410 and the corresponding clamping block 460 are distributed along the radial direction of the sleeve, and the clamping block 460 is located on the side of the movable block 410 facing the center of the sleeve. A slot is provided on the side of the movable block 410 facing the center of the sleeve, and a plug-in column is provided on the side of the clamping block 460 facing the movable block 410, and the plug-in column is movably inserted into the slot. A first compression spring 462 is provided in the slot, and the two ends of the first compression spring 462 are respectively press-fitted with the bottom of the slot and the top of the plug-in column, so that each clamping block 460 is close to each other toward the center of the sleeve in the initial position.

[0042] In this embodiment, a straight rack 413 is provided on the inner wall of the slot, and a one-way ratchet bar 470 for engaging with the straight rack 413 is provided on the outer peripheral wall of the plug-in column. The one-way ratchet bar 470 is separated from the straight rack 413 when the clamping block 460 is in the initial position, so that the threaded insert 110 can push the clamping block 460 outward in the radial direction of the sleeve when it is inserted into the sleeve. A support rod 414 extending in the radial direction of the sleeve is provided in the slot, and a sleeve 450 is rotatably provided on the support rod 414. An annular groove is provided on the outer side wall of the sleeve 450. The annular groove is a parallelogram, and includes a first straight groove 452 and a second straight groove 453 arranged in parallel, and also includes a first oblique groove 454 and a second oblique groove 455 arranged in parallel. The first straight groove 452, the first oblique groove 454, the second straight groove 453 and the second oblique groove 455 are connected end to end in sequence to form a parallelogram. The first straight groove 452 and the second straight groove 453 extend along the axial direction of the support rod 414, and the first oblique groove 454 and the second oblique groove 455 are respectively located at the two ends of the first straight groove 452 and the second straight groove 453. The groove depth of the first straight groove 452 is greater than the groove depth of the second straight groove 453, and the groove depths of the first oblique groove 454 and the second oblique groove 455 gradually decrease from the first straight groove 452 to the second straight groove 453. A plug hole is provided in the plug column, and the end of the sleeve 450 facing the center of the sleeve extends into the plug hole, and the annular groove is located inside the plug hole. A push rod 471 is connected to the side of the one-way ratchet bar 470 that is away from the straight rack 413, and the axis of the push rod 471 is perpendicular to the axis of the sleeve 450. The push rod 471 is movably inserted in the plug column along its own axial direction, and the end of the push rod 471 away from the one-way ratchet bar 470 extends into the annular groove. When the clamping block 460 is in the initial position, the push rod 471 is located at one end of the first straight groove 452 close to the clamping block 460. When the threaded insert 110 pushes the clamping block 460 radially outward along the sleeve, the clamping block 460 drives the push rod 471 to move along the first straight groove 452. When the clamping block 460 reaches the avoidance position, the push rod 471 moves into the second inclined groove 455. Then, the clamping block 460 moves toward the center of the sleeve under the pushing action of the first compression spring 462, so that the push rod 471 drives the sleeve 450 to rotate along the second inclined groove 455 until the push rod 471 enters the second straight groove 453.When the push rod 471 moves into the second straight groove 453, the push rod 471 pushes the one-way ratchet bar 470 axially toward the straight rack 413, so that the one-way ratchet bar 470 is meshed with the straight rack 413. At this time, the clamping block 460 is in the clamping position. Since the one-way ratchet bar 470 and the straight rack 413 are in a meshing state at this time, and the ratchet teeth of the one-way ratchet bar 470 are helical teeth with one side tilted, and the tilted side of the helical teeth faces the clamping block 460, when the clamping block 460 is in the clamping position and is clamped in contact with the outer periphery of the threaded insert 110, the clamping block 460 can only move toward the center of the sleeve and cannot move away from the center of the sleeve, thereby enabling the clamping block 460 to reliably clamp the threaded insert 110.

[0043] In this embodiment, an elastic strip 451 is provided on the inner wall of the sleeve 450. In this embodiment, two elastic strips 451 are provided on the inner wall of the sleeve 450. The two elastic strips 451 are arranged on radially opposite sides of the inner wall of the sleeve. Two groups of limiting slots 415 corresponding to the two elastic strips 451 are provided on the outer wall of the support rod 414. Each group of limiting slots 415 has two, and each elastic strip 451 corresponds to two limiting slots 415. In the initial state, the elastic strip 451 is located in one of the limiting slots 415. When the top rod 471 drives the sleeve 450 to rotate a certain angle, the elastic strip 451 will switch from the original limiting slot 415 to the other limiting slot 415.

[0044] In this embodiment, a first mounting groove 461 is provided on the outer peripheral wall of the plug-in column, and the one-way ratchet bar 470 is located in the first mounting groove 461. A first tension spring 472 is connected between the one-way ratchet bar 470 and the first mounting groove 461. When the clamping block 460 is in the initial position, the first tension spring 472 drives the one-way ratchet bar 470 to separate from the spur rack 413. In this embodiment, an insertion hole is provided on the side of the one-way ratchet bar 470 that faces away from the spur rack 413, and one end of the push rod 471 is inserted into the insertion hole. A second compression spring 473 is provided in the insertion hole, and both ends of the second compression spring 473 are respectively pressed and matched with the push rod 471 and the one-way ratchet bar 470.

[0045] In this embodiment, the sleeve includes a side wall and a bottom wall, and a first annular groove 332 is provided on the bottom wall of the sleeve, and the first annular groove 332 is coaxially arranged with the sleeve. A radial straight groove 331 corresponding to the movable block 410 is also provided on the bottom wall of the sleeve, and the radial straight groove 331 extends along the radial direction of the sleeve, and the radial straight groove 331 is located at the periphery of the first annular groove 332, and one end of the radial straight groove 331 is connected with the first annular groove 332. A guide protrusion 416 is provided at the lower end of the movable block 410, and the guide protrusion 416 is guided and arranged in the first annular groove 332. A second mounting groove 411 is formed on the side of the guide protrusion 416 facing away from the clamping block 460, and a locking block 430 is movably installed in the second mounting groove 411 through a third compression spring. The locking block 430 can move radially along the sleeve in the second mounting groove 411, and the locking block 430 extends into the radial straight groove 331 to prevent the movable block 410 from moving in the first annular groove 332. The locking block 430 is provided with guiding inclined surfaces on opposite sides respectively. When the threaded insert 110 is rusted, it will be more difficult to unscrew the threaded insert 110. In this way, the resistance of the clamping block 460 when clamping the threaded insert 110 and driving the threaded insert 110 to rotate will be greater, that is, the resistance of the clamping block 460 to the threaded insert 110 increases. In this way, the locking block 430 is squeezed by the side wall of the radial straight groove 331 and retracted into the second mounting groove 411. The locking block 430 will release the obstruction to the movable block 410, so that the movable block 410 releases the transmission connection with the sleeve. In this way, when the sleeve rotates, it no longer drives the movable block 410 to rotate together. The movable block 410 can move relative to the sleeve, and the movable block 410 moves circumferentially along the first annular groove 332 in the sleeve.

[0046] In this embodiment, a damping assembly 420 is provided in the radial straight groove 331, one end of the damping assembly 420 is fixedly connected to the side wall of the sleeve, and the other end is located in the radial straight groove 331 and can be extended and retracted along the radial straight groove 331. In the initial state, the locking block 430 and the damping assembly 420 are pressed together. When the locking block 430 is retracted into the second installation groove 411, the damping assembly 420 is extended, which can prevent the locking block 430 from being stuck in the radial straight groove 331 when the sleeve rotates, thereby preventing the locking block 430 from getting stuck every time it passes through the radial straight groove 331.

[0047] In this embodiment, a second annular groove 337 is further provided on the bottom wall of the sleeve, and a supporting protrusion 412 is further provided at the lower end of the movable block 410. The supporting protrusion 412 is located in the second annular groove 337, and the lower end of the supporting protrusion 412 is supported and matched with the bottom of the second annular groove 337. The bottom of the second annular groove 337 is a corrugated surface, and the corrugated surface includes a wave crest section 334, a wave trough section 335 and a plane section, and the plane section is arranged in a one-to-one correspondence with the radial straight groove 331. There are multiple wave crest sections 334 and wave trough sections 335, and the number is the same. The wave crest sections 334 and wave trough sections 335 are alternately distributed along the circumference of the second annular groove 337, and each plane section is respectively located between adjacent wave crest sections 334 and wave trough sections 335. When the threaded insert 110 becomes rusty and difficult to unscrew, the movable block 410 and the sleeve will no longer transmit information, and the movable block 410 will move circumferentially along the first annular groove 332. The supporting protrusion 412 moves along the corrugated surface to make the movable block 410 reciprocate up and down. In this way, during the reciprocating up and down movement of the movable block 410, the clamping block 460 and the movable block 410 move reciprocatingly up and down synchronously relative to the threaded insert 110. Since the clamping block 460 moves up and down relative to the threaded insert 110, friction will occur between the clamping block 460 and the outer hexagonal side of the threaded insert 110, so that the rust on the outer hexagonal side of the threaded insert 110 can be cleaned off, which makes it convenient to manually unscrew the threaded insert 110 later.

[0048] In this embodiment, a lower pressure plate 440 is floatingly provided at the upper end of the movable block 410, and two guide holes are opened at the upper end of the movable block 410, and a fifth compression spring is provided in the guide hole. Two guide rods are provided on the lower side of the lower pressure plate 440, and the guide rods are inserted in the guide holes. The two ends of the fifth compression spring are respectively pressed with the movable block 410 and the guide rods. The driving assembly 300 is clamped between the second mold frame 220 and the third mold frame 230, and the upper side of the lower pressure plate 440 is pressed with the second mold frame 220. Under the action of the fifth compression spring, the lower end of the movable block 410 and the bottom wall of the sleeve are always elastically supported and fitted.

[0049] In this embodiment, in order to improve the clamping force of the clamping block 460 on the threaded insert 110, a plurality of clamping rollers 490 are rotatably provided on the clamping surface of each clamping block 460, and the plurality of clamping rollers 490 are arranged in parallel and evenly spaced in the up-down direction. The clamping rollers 490 include a rotating shaft 492 and a roller 491 sleeved on the rotating shaft 492, and the rotating shaft 492 is rotatably provided on the clamping block 460. The two ends of each rotating shaft 492 are respectively connected to a limited position gear 4921, and the clamping block 460 is provided with a limited position gear ring 493 for matching with the limited position gear 4921 at the two ends of the rotating shaft 492, and the limited position gear ring 493 is movably provided on the clamping block 460 through a slider 4932, and a third compression spring is provided between the limited position gear ring 493 and the clamping block 460. Side pressure plates 480 are respectively provided on opposite sides of the clamping block 460 in a floating manner. Specifically, third mounting grooves 463 are respectively provided on opposite sides of the clamping block 460, and the side pressure plates 480 are movably installed in the third mounting grooves 463. One end of each limiting gear ring 493 away from the limiting gear 4921 is provided with a top pressing inclined surface for extrusion-matching with the side pressure plate 480, and a fourth compression spring is provided between the side pressure plate 480 and the clamping block 460 for top pressing. When the clamping block 460 is located at the initial position and the clamping position, the side pressure plates 480 between the clamping blocks 460 squeeze each other, and each side pressure plate 480 squeezes the corresponding limit gear ring 493, so that the limit gear ring 493 overcomes the action of the third compression spring and cooperates with the limit gear 4921 sleeve. After the limit gear ring 493 cooperates with the limit gear 4921 sleeve, the side pressure plate 480 restricts the rotation of the limit gear ring 493, so that the limit gear ring 493 and the rotating shaft 492 cannot rotate. When the clamping block 460 is in the avoidance position, the side pressure plate 480 releases the squeezing effect on the limiting gear ring 493 under the action of the fourth compression spring, and the limiting gear ring 493 is separated from the limiting gear ring 493 under the action of the third compression spring, so that the rotating shaft 492 is in a free state. In this way, when the threaded insert 110 is inserted downward between the clamping blocks 460, the clamping roller 490 and the threaded insert 110 are in rolling contact, which can reduce the friction between the clamping block 460 and the threaded insert 110.

[0050] When the clamping block 460 is in the clamping position, since the limiting gear ring 493 and the limiting gear 4921 are in the state of plug-in matching, the limiting gear ring 493 and the rotating shaft 492 cannot rotate. In addition, a one-way clutch is provided between the roller 491 and the rotating shaft 492. The transmission directions of the one-way clutches between the two adjacent rotating shafts 492 and the roller 491 are opposite. In this way, the transmission between the sleeve and the movable block 410 is disengaged. When the movable block 410 and the clamping block 460 rotate relative to the sleeve, When the movable block 410 and the clamping block 460 synchronously move up and down relative to the threaded insert 110, half of the multiple clamping rollers 490 on each clamping block 460 can roll relative to the threaded insert 110, that is, half of the clamping rollers 490 roll and frictionally cooperate with the outer side of the threaded insert 110, and the other half of the clamping rollers 490 cannot roll relative to the threaded insert 110, that is, they slide and frictionally occur with the outer side of the threaded insert 110, thereby cleaning the rust on the outer side of the threaded insert 110. In this embodiment, the groove bottom of the first annular groove 332 includes a first groove section 333 and a second groove section 336, the depth of the first groove section 333 is less than the depth of the second groove section 336, the position of the first groove section 333 corresponds to the position of the wave crest section 334 of the second annular groove 337, and the position of the second groove section 336 corresponds to the position of the wave trough section 335 of the second annular groove 337, so that the guiding protrusion 416 can be prevented from interfering with the groove bottom of the first annular groove 332.

[0051] When the threaded insert disassembly device of the present invention is used, two parts 100 to be disassembled are respectively clamped in two embedding grooves on the first mold frame 210, and the four threaded inserts 110 on each part 100 are respectively extended downward into the sleeve at the upper end of the disassembly shaft 330. In the initial state, each clamping block 460 is close to each other toward the center of the sleeve, and the locking block 430 at the lower end of each movable block 410 is respectively clamped into the corresponding radial straight groove 331, and the locking block 430 is respectively pressed with the damping assembly 420, and the locking block 430 realizes the transmission connection between the movable block 410 and the sleeve, so that when the driving motor 310 drives the disassembly shaft 330 to rotate, the sleeve can drive the movable block 410 and the clamping block 460 to rotate synchronously. In the initial state, the push rod 471 is in the first straight groove 452 . Since the depth of the first straight groove 452 is greater than that of the second straight groove 453 , the one-way ratchet bar 470 is disengaged from the straight rack 413 . At this time, the clamping block 460 can move relative to the movable block 410 .

[0052] Since the circumferential position of the outer hexagonal side of each threaded insert 110 is not fixed, when the threaded insert 110 extends downward into the sleeve, there will be a misalignment angle between the outer hexagonal side of the threaded insert 110 and the clamping block 460, so that the vertex position of the outer hexagonal side of the threaded insert 110 will push the clamping block 460 to disperse outward, and the clamping block 460 will disperse outward and move with the push rod 471 in the first straight groove 452. After the clamping block 460 reaches the avoidance position, the push rod 471 is in the second inclined groove 455. Since the clamping block 460 does not clamp the threaded insert 110 at this time, when the disassembly shaft 330 rotates, the threaded insert 110 does not move, and the movable block 410 and the clamping block 460 rotate relative to the threaded insert 110. When the outer hexagonal side surface of the thread insert 110 is in contact with the clamping surface of the clamping block 460, the clamping block 460 moves inward from the away avoidance position to the clamping position. In this process, the push rod 471 pushes the sleeve 450 to rotate a certain angle, so that the elastic strip 451 switches from one limiting slot 415 to another limiting slot 415, and in this process, the push rod 471 enters the second straight groove 453 along the second inclined groove 455. Since the depth of the second straight groove 453 is small, the push rod 471 can push the one-way ratchet bar 470 to engage with the straight rack 413. At this time, the clamping block 460 can only move toward the center of the sleeve and cannot move away from the center of the sleeve, thereby realizing that the clamping block 460 reliably clamps the thread insert 110. After the thread insert 110 is inserted between each clamping block 460, the driving motor 310 is started, thereby driving each disassembly shaft 330 to rotate and screw the thread insert 110.

[0053] When the threaded insert 110 is rusted, the rusted threaded insert 110 will be more difficult to unscrew, so that the resistance of the clamping block 460 when clamping the threaded insert 110 and driving the threaded insert 110 to rotate will be greater, that is, the resistance of the clamping block 460 to the threaded insert 110 increases, so that the locking block 430 is squeezed by the side wall of the radial straight groove 331 and retracted into the second mounting groove 411, and the locking block 430 will release the obstruction to the movable block 410, so that the movable block 410 releases the transmission connection with the sleeve, so that when the sleeve rotates, it no longer drives the movable block 410 to rotate together, and the movable block 410 can move relative to the sleeve, and the movable block 410 moves circumferentially along the first annular groove 332 in the sleeve. When the movable block 410 rotates relative to the sleeve, the supporting protrusion 412 moves along the corrugated surface of the second annular groove 337 to make the movable block 410 reciprocate up and down. In this way, during the reciprocating up and down movement of the movable block 410, the clamping block 460 and the movable block 410 synchronously reciprocate up and down relative to the threaded insert 110. Since the clamping block 460 moves up and down relative to the threaded insert 110, friction will occur between the clamping block 460 and the outer hexagonal side of the threaded insert 110, so that the rust on the outer hexagonal side of the threaded insert 110 can be cleaned. After the threaded insert 110 without rust is unscrewed, the part 100 is removed, and the threaded insert 110 is subsequently unscrewed manually.

[0054] When the part 100 is removed from the first mold frame 210, the clamping blocks 460 are reset and moved closer to each other under the action of the first compression spring 462, and then the push rod 471 moves from the second straight groove 453 to the first inclined groove 454, and then enters the first straight groove 452 along the first inclined groove 454. When the push rod 471 moves along the first inclined groove 454, the sleeve 450 rotates in the opposite direction and resets, and the elastic strip 451 switches from one limiting groove 415 to another limiting groove 415.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A threaded insert removal device, characterized in that: The invention comprises a chassis (200) and a driving assembly (300) arranged in the chassis (200), wherein the top of the chassis (200) is provided with an embedding groove for clamping a part (100) to be disassembled, and the driving assembly (300) comprises a driving motor (310) and a plurality of disassembly shafts (330), wherein the disassembly shafts (330) are arranged in parallel and spaced apart, and the axes thereof extend in the up-down direction, and the upper end of each disassembly shaft (330) is fixed with a sleeve for being sleeved on the periphery of a threaded insert (110), wherein the sleeve is provided with a clamping assembly (400) for clamping the threaded insert (110), and wherein the clamping assembly (400) comprises a plurality of clamping blocks (460), wherein the plurality of clamping blocks (460) are evenly distributed along the circumference of the sleeve, and each clamping block (460) has a plurality of clamping blocks for clamping the threaded insert (110). The clamping surface is fitted with the outer hexagonal side of the threaded insert (110), and each clamping block (460) is respectively arranged to move along the radial direction of the sleeve. The movable path of each clamping block (460) has an initial position, a clamping position and an avoidance position. The clamping position is located between the initial position and the avoidance position. When the threaded insert (110) is inserted into the sleeve, the threaded insert (110) pushes each clamping block (460) outward along the radial direction of the sleeve to the avoidance position. When the clamping block (460) is at the clamping position, the clamping surface is fitted with the outer hexagonal side of the threaded insert (110). The driving motor (310) is respectively connected to each disassembly shaft (330) to drive each disassembly shaft (330) to rotate.

2. The threaded insert removal device according to claim 1, characterized in that: The clamping assembly (400) further includes a movable block (410) arranged in one-to-one correspondence with the clamping block (460), the movable block (410) and the corresponding clamping block (460) are distributed along the radial direction of the sleeve, the clamping block (460) is located on the side of the movable block (410) facing the center of the sleeve, the movable block (410) is provided with a slot on the side facing the center of the sleeve, the clamping block (460) is provided with a plug-in column on the side facing the movable block (410), the plug-in column is movably inserted into the slot, and a first compression spring (462) is provided in the slot, the two ends of the first compression spring (462) are respectively press-fitted with the bottom of the slot and the top of the plug-in column, so that each clamping block (460) is close to each other toward the center of the sleeve in the initial position.

3. The threaded insert removal device according to claim 2, characterized in that: A straight rack (413) is provided on the inner wall of the slot, and a one-way ratchet (470) for engaging with the straight rack (413) is provided on the outer peripheral wall of the plug-in column. The one-way ratchet (470) is separated from the straight rack (413) when the clamping block (460) is in the initial position, so that the threaded insert (110) can push the clamping block (460) outward along the radial direction of the sleeve when the threaded insert (110) is inserted into the sleeve. A support rod (414) extending along the radial direction of the sleeve is provided in the slot, and a sleeve (450) is rotatably provided on the support rod (414). An annular groove is provided on the outer side wall of the sleeve (450), and the annular groove is a parallelogram. The annular groove includes a first straight groove (452) and a second straight groove (453) arranged in parallel. The first straight groove (452), the first oblique groove (454), the second straight groove (453) and the second oblique groove (455) are connected end to end to form a parallelogram. The first straight groove (452) and the second straight groove (453) extend along the axial direction of the support rod (414). The first oblique groove (454) and the second oblique groove (455) are respectively located at the two ends of the first straight groove (452) and the second straight groove (453). The groove depth of the first straight groove (452) is greater than the groove depth of the second straight groove (453). The groove depths of the first oblique groove (454) and the second oblique groove (455) gradually decrease from the first straight groove (452) to the second straight groove (453). A socket is provided in the plug-in column, and one end of the sleeve (450) toward the center of the sleeve extends into the socket, and the annular groove is located inside the socket. A push rod (471) is connected to the side of the one-way ratchet bar (470) facing away from the straight rack (413), and the axis of the push rod (471) is perpendicular to the axis of the sleeve (450). The push rod (471) is inserted into the plug-in column along its own axial movement, and the end of the push rod (471) away from the one-way ratchet bar (470) extends into the annular groove. When the clamping block (460) is in the initial position, the push rod (471) is located at one end of the first straight groove (452) close to the clamping block (460). When the threaded insert (110) pushes the clamping block (460) radially outward along the sleeve, The clamping block (460) drives the push rod (471) to move along the first straight groove (452). When the clamping block (460) reaches the avoidance position, the push rod (471) moves into the second inclined groove (455). Then, the clamping block (460) moves toward the center of the sleeve under the pushing action of the first compression spring (462), so that the push rod (471) drives the sleeve (450) to rotate along the second inclined groove (455) until the push rod (471) enters the second straight groove (453). When the push rod (471) moves into the second straight groove (453), the push rod (471) pushes the one-way ratchet bar (470) axially toward the straight rack (413), so that the one-way ratchet bar (470) engages with the straight rack (413).At this time, the clamping block (460) is in the clamping position, and the clamping block (460) can only move toward the center of the sleeve and cannot move away from the center of the sleeve.

4. The threaded insert removal device according to claim 3, characterized in that: A first mounting groove (461) is provided on the outer peripheral wall of the plug-in column, and the one-way ratchet bar (470) is located in the first mounting groove (461). A first tension spring (472) is connected between the one-way ratchet bar (470) and the first mounting groove (461). When the clamping block (460) is in the initial position, the first tension spring (472) drives the one-way ratchet bar (470) to separate from the straight rack (413).

5. The threaded insert removal device according to claim 4, characterized in that: An insertion hole is provided on a side of the one-way ratchet bar (470) facing away from the spur rack (413), one end of the push rod (471) is inserted into the insertion hole, a second compression spring (473) is provided in the insertion hole, and two ends of the second compression spring (473) are respectively pressed against the push rod (471) and the one-way ratchet bar (470).

6. The threaded insert removal device according to claim 3, characterized in that: The sleeve comprises a side wall and a bottom wall, a first annular groove (332) is provided on the bottom wall of the sleeve, the first annular groove (332) is coaxially arranged with the sleeve, and a radial straight groove (331) corresponding to the movable block (410) is further provided on the bottom wall of the sleeve, the radial straight groove (331) extends along the radial direction of the sleeve, the radial straight groove (331) is located on the periphery of the first annular groove (332), and one end of the radial straight groove (331) is communicated with the first annular groove (332), a guide protrusion (416) is provided at the lower end of the movable block (410), the guide protrusion (416) is guided and arranged in the first annular groove (332), and a second mounting groove (411) is provided on the side of the guide protrusion (416) away from the clamping block (460), and the second mounting groove (411) is provided. 1) A locking block (430) is movably installed in the sleeve through a third compression spring. The locking block (430) can move radially in the second mounting groove (411). The locking block (430) extends into the radial straight groove (331) to prevent the movable block (410) from moving in the first annular groove (332). Guide slopes are respectively provided on opposite sides of the locking block (430). When the threaded insert (110) is rusted, the clamping block (460) is subject to increased resistance from the threaded insert (110). The locking block (430) is squeezed by the side wall of the radial straight groove (331) and retracted into the second mounting groove (411). The locking block (430) releases the blockage of the movable block (410). When the sleeve rotates, the movable block (410) moves circumferentially along the first annular groove (332).

7. The threaded insert removal device according to claim 6, characterized in that: A damping assembly (420) is provided in the radial straight groove (331), one end of the damping assembly (420) is fixedly connected to the side wall of the sleeve, and the other end is located in the radial straight groove (331) and can be extended and retracted along the radial straight groove (331). In an initial state, the locking block (430) and the damping assembly (420) are press-fitted. When the locking block (430) is retracted into the second mounting groove (411), the damping assembly (420) is extended.

8. The threaded insert removal device according to claim 7, characterized in that: A second annular groove (337) is further provided on the bottom wall of the sleeve. A supporting protrusion (412) is further provided at the lower end of the movable block (410). The supporting protrusion (412) is located in the second annular groove (337). The lower end of the supporting protrusion (412) is supported and matched with the bottom of the second annular groove (337). The bottom of the second annular groove (337) is a corrugated surface. The corrugated surface includes a peak section (334), a trough section (335) and a plane section. The plane section is aligned with the radial straight groove (331). Arranged in a one-to-one correspondence, the peak sections (334) and the trough sections (335) are both multiple and of the same number, the peak sections (334) and the trough sections (335) are alternately distributed along the circumference of the second annular groove (337), and each plane section is located between adjacent peak sections (334) and trough sections (335). When the movable block (410) moves along the circumference of the first annular groove (332), the supporting protrusion (412) moves along the corrugated surface, causing the movable block (410) to reciprocate up and down.

9. The threaded insert removal device according to claim 8, characterized in that: A lower pressure plate (440) is provided on the upper end of the movable block (410) in a floating manner. At least one guide hole is provided on the upper end of the movable block (410). A fifth compression spring is provided in the guide hole. A guide rod is provided on the lower side of the lower pressure plate (440). The guide rod is inserted into the guide hole. Both ends of the fifth compression spring are respectively press-fitted with the movable block (410) and the guide rod. The chassis (200) includes a first mold frame (210), a second mold frame (220) and a third mold frame (230) arranged in sequence from top to bottom. The drive assembly (300) is installed between the second mold frame (220) and the third mold frame (230). The upper side of the lower pressure plate (440) is press-fitted with the second mold frame (220). The part (100) to be disassembled is clamped on the first mold frame (210).

10. The threaded insert removal device according to claim 9, characterized in that: A plurality of clamping rollers (490) are rotatably provided on the clamping surface of each clamping block (460), and the plurality of clamping rollers (490) are arranged in parallel and evenly spaced in the vertical direction. The clamping rollers (490) include a rotating shaft (492) and a roller (491) sleeved on the rotating shaft (492). The rotating shaft (492) is rotatably provided on the clamping block (460), and a one-way clutch is provided between the roller (491) and the rotating shaft (492). Two adjacent rotating shafts are connected to each other. The transmission directions of the one-way clutch between the driving shaft (492) and the roller (491) are opposite, and the two ends of each rotating shaft (492) are respectively connected to the limiting gear (4921), and the clamping block (460) is provided with a limiting gear ring (493) for matching with the limiting gear (4921) at the two ends of the rotating shaft (492). The limiting gear ring (493) is movably arranged on the clamping block (460). The limiting gear ring (493) and the clamping block (460) are connected to each other. 60) is provided with a third compression spring for top pressure, and side pressure plates (480) are respectively provided on the opposite sides of the clamping block (460) in a floating manner. One end of each limiting gear ring (493) away from the limiting gear (4921) is provided with a top pressure inclined surface for extrusion and matching with the side pressure plate (480), and a fourth compression spring is provided between the side pressure plate (480) and the clamping block (460). When the clamping block (460) is in the initial position, the side pressure plates between each clamping block (460) are (480) squeeze each other, and each side pressure plate (480) squeezes the corresponding limit gear ring (493) respectively, so that the limit gear ring (493) overcomes the force of the third compression spring and cooperates with the limit gear (4921). When the clamping block (460) is in the avoidance position, the side pressure plate (480) releases the squeezing effect on the limit gear ring (493) under the action of the fourth compression spring, and the limit gear ring (493) is separated from the limit gear ring (493) under the action of the third compression spring.

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