CN212792712U

CN212792712U - Gear bolt gasket composite die

Info

Publication number: CN212792712U
Application number: CN202021703736.2U
Authority: CN
Inventors: 陈德荣
Original assignee: Jiashan Huihui Metal Products Co ltd
Current assignee: Jiashan Huihui Metal Products Co ltd
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2021-03-26
Anticipated expiration: 2030-08-14

Abstract

The utility model discloses a gear bolt gasket composite mold belongs to composite mold technical field, including fixed establishment, moving mechanism and actuating mechanism all set up in fixed establishment, moving mechanism is connected with actuating mechanism, actuating mechanism includes rotating part and adapting unit, rotating part is connected with adapting unit, adapting unit sets up the below at the movable plate, rotating part sets up in the upper apron, the staff can rotate rotating part and provide drive power and make adapting unit operate for adapting unit, adapting unit can provide power and make the movable plate launch the removal for the movable plate when the operation. The utility model provides a mould among the prior art can't remove the use to the gear bolt gasket of equidimension not, need change the mould according to the size of gear bolt gasket when concrete operation, and this kind of mode just need prepare multiple kind's mould, the very big problem that has influenced work efficiency of concrete during operation.

Description

Gear bolt gasket composite die

Technical Field

The utility model belongs to the technical field of composite die technique and specifically relates to a gear bolt gasket composite die is related to.

Background

Moulds (Mule) are used for obtaining various moulds and tools of required products by injection moulding, blow moulding, extrusion, die casting or forging forming, smelting, stamping and other methods in industrial production. In short, a mold is a tool used to make a shaped article, the tool being made up of various parts, different molds being made up of different parts. The processing of the appearance of an article is realized mainly through the change of the physical state of a formed material. The element has the name of "industrial mother".

In the prior art, various dies are invented for different articles, the dies for the gear bolt gasket cannot be used for the gear bolt gaskets with different sizes in specific work, the dies need to be replaced according to the sizes of the gear bolt gaskets in specific work, and various dies need to be prepared in the mode, so that the working efficiency and the die cost are greatly influenced in the specific work.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gear bolt gasket composite mold to solve the technical problem among the prior art.

The utility model provides a gear bolt gasket composite die, a serial communication port, including fixed establishment, moving mechanism and actuating mechanism all set up in fixed establishment, moving mechanism is connected with actuating mechanism.

Further, fixed establishment includes upper cover plate, lower floor's apron and bottom loading board, upper cover plate corresponds from top to bottom with lower floor's apron and is connected, the bottom of lower floor's apron is equipped with the rectangular channel, be equipped with rectangular hole and circular recess on the upper cover plate, the rectangular hole sets up on the lateral wall of upper cover plate one side, the circular recess sets up the top at the rectangular hole, the bottom loading board sets up in the rectangular channel, be equipped with the slide on the bottom loading board.

Further, the moving mechanism comprises four moving plates and four groups of moving blocks, the outer diameters of the four moving plates are rectangular when the four moving plates are tightly attached, each moving plate is provided with an arc-shaped groove, the four moving plates form a circular groove when the four moving plates are tightly attached, the inner sides of the four moving plates are all arc-shaped, circular holes are formed at the positions, which are arc-shaped grooves, of the inner sides of the four moving plates when the four moving plates are tightly attached, and each group of moving blocks are symmetrically arranged below each group of moving plates and located in the slide way.

Further, the driving mechanism comprises a rotating part and a connecting part, the rotating part is connected with the connecting part, the connecting part is arranged below the moving plate, and the rotating part is arranged in the upper cover plate.

Further, the rotating component comprises a rotating button, a first connecting rod, an upper connecting rod, a triangular lug, a lower connecting rod, a second connecting rod, a first rotating bevel gear and a second rotating bevel gear, the rotating button is arranged above the upper-layer cover plate, two ends of the first connecting rod are respectively connected with the rotating button and the upper-layer connecting column, the upper connecting column and the lower connecting column are both arranged in a rectangular hole arranged on the upper cover plate, the triangular lug is arranged below the upper connecting column, the lower connecting column is provided with a triangular groove which is matched and connected with the triangular bump, the top end of the second connecting rod is connected with the lower layer connecting column, the bottom end of the second connecting rod is connected with the first rotating bevel gear, the first rotating bevel gear is meshed with a second rotating bevel gear, and the second rotating bevel gear is connected with the connecting component.

Further, the connecting component comprises a first threaded rod, a first bevel gear, a second threaded rod, a second bevel gear, a third threaded rod, a third bevel gear, a fourth threaded rod, a fourth bevel gear, four connecting blocks and three fixing columns, wherein the first bevel gear, the second bevel gear, the third bevel gear and the fourth bevel gear are all arranged below the inner diameter intersection points of the four moving plates and are meshed with each other, the first threaded rod, the second threaded rod, the third threaded rod and the fourth threaded rod are all connected with one connecting block, each connecting block is connected with the bottom of one moving plate, one end of the first threaded rod is connected with the second rotating bevel gear, the other end of the first threaded rod is connected with the first bevel gear, two ends of the second threaded rod are respectively connected with the second bevel gear and one fixing column, two ends of the third threaded rod are respectively connected with the third bevel gear and one fixing column, the two ends of the fourth bevel gear are respectively connected with the fourth bevel gear and a fixing column, the threads on the first threaded rod and the second threaded rod are arranged clockwise, and the threads on the third threaded rod and the fourth threaded rod are arranged anticlockwise.

Compared with the prior art, the beneficial effects of the utility model reside in that:

one of them, through fixed establishment, moving mechanism and actuating mechanism's cooperation is connected and can be made actuating mechanism drive moving mechanism move on fixed establishment, moving mechanism can expand this moment, and the moving mechanism internal diameter grow after the expansion, can adjust according to the size of gear bolt gasket, and prior art's mould is mostly can only be changed according to the size of gear bolt gasket, the size of mould can be adjusted to a small part, this application is compared in prior art and has not only reduced the finished product of changing the mould, and work efficiency is improved, and this application makes moving mechanism launch in step through a drive power, compare in prior art in the mould that can adjust the size, this application is more convenient and accurate when adjusting the size.

And when the gear bolt gasket is placed on the inner diameter of the moving plate for punching, the circular arc-shaped position on the moving plate can ensure that the punching drill cannot contact with the moving plate, the moving plate is prevented from being damaged by the punching drill, and the service life of the moving plate can be prolonged.

Third, the rotatable part includes the knob, the head rod, the upper spliced pole, triangle-shaped lug, the lower floor's spliced pole, the second connecting rod, first rotation bevel gear and second rotation bevel gear, when needs provide drive power for adapting unit, can make the head rod drive the upper connecting column and rotate through twisting the knob, the upper connecting column can make the lower floor's spliced pole carry out synchronous rotation through the triangle-shaped lug and the cooperation of the triangle-shaped recess that is equipped with on the spliced pole of lower floor, the lower floor's spliced pole rotates and can make the second connecting rod drive first rotation bevel gear and the second rotates bevel gear rotates, and transmit drive power for adapting unit through the second rotation bevel gear and make adapting unit rotate, when need not provide drive power for adapting unit, can upwards pull up through the knob, make the upper connecting column remove to circular recess and rotate the knob and make the triangle-shaped lug and the lower floor's spliced pole of upper connecting column below be equipped The groove does not correspond, can't give adapting unit transmission power through wrench movement knob this moment, can guarantee can not take place unexpected touching knob and make the movable plate take place to remove, can rotate through the simple swift messenger adapting unit of above-mentioned mode to can guarantee that can not take place unexpected touching knob and make the movable plate remove, reduced the condition that the movable plate accident takes place to squint under the operating condition, also reduced the disability rate of gear bolt gasket simultaneously.

Drawings

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

Fig. 1 is a cross-sectional view of the present invention;

fig. 2 is a schematic perspective view of the present invention;

fig. 3 is a partial structural diagram of the first embodiment of the present invention;

fig. 4 is a schematic view of a partial structure of the present invention;

FIG. 5 is a schematic structural diagram of the connecting member of the present invention;

fig. 6 is an assembly view of the rotating member of the present invention.

Reference numerals: the device comprises a fixing mechanism 1, an upper cover plate 11, a lower cover plate 12, a bottom bearing plate 13, a rectangular groove 121, a slide rail 131, a rectangular hole 111, a circular groove 112, a moving mechanism 2, a moving plate 21, a moving block 22, a driving mechanism 3, a rotating part 31, a rotating button 311, a first connecting rod 312, an upper connecting column 313, a triangular bump 314, a lower connecting column 315, a second connecting rod 316, a first rotating bevel gear 317, a second rotating bevel gear 318, a triangular groove 3151, a connecting part 32, a first threaded rod 321, a first bevel gear 322, a second threaded rod 323, a second bevel gear 324, a third threaded rod 325, a third bevel gear 326, a fourth threaded rod 327, a fourth bevel gear 328, a connecting block 329 and a fixing column 3210.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.

The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 6, the embodiment of the present invention provides a gear bolt gasket composite mold, including fixing mechanism 1, moving mechanism 2 and actuating mechanism 3 all set up in fixing mechanism 1, moving mechanism 2 is connected with actuating mechanism 3, fixing mechanism 1 is used for placing moving mechanism 2 and actuating mechanism 3, and actuating mechanism 3 can make moving mechanism 2 expand, makes moving mechanism 2's internal diameter increase, and moving mechanism 2 cooperates actuating mechanism 3 to adjust according to the gear bolt gasket of equidimension not, compares in prior art need carry out the mould of changing according to gear bolt gasket size, and this application has improved work efficiency and has reduced the mould cost.

Specifically, fixed establishment 1 includes upper cover plate 11, lower floor's apron 12 and bottom bearing board 13, upper cover plate 11 corresponds from top to bottom with lower floor's apron 12 and is connected, lower floor's apron 12 bottom is equipped with rectangular channel 121, be equipped with rectangular hole 111 and circular recess 112 on upper cover plate 11, rectangular hole 111 sets up on the lateral wall of upper cover plate 11 one side, circular recess 112 sets up the top at rectangular hole 111, bottom bearing board 13 sets up in rectangular channel 121, be equipped with slide 131 on the bottom bearing board 13, bottom bearing board 13 is used for supporting moving mechanism 2, actuating mechanism 3 can be placed to rectangular hole 111, slide 131 can make moving mechanism 2 can not take place the offset when removing.

Specifically, the moving mechanism 2 includes four moving plates 21 and four sets of moving blocks 22, the outer diameter of each of the four moving plates 21 is rectangular when the moving plates are tightly attached, each of the moving plates 21 is provided with an arc-shaped groove, each of the four moving plates 21 forms a circular groove when the moving plates are tightly attached, the inner sides of the four moving plates 21 are all arc-shaped, circular holes are formed at positions of the arc-shaped grooves on the inner sides of the four moving plates 21 when the moving plates are tightly attached, each set of the moving blocks 22 is respectively and symmetrically arranged below each set of the moving plates 21 and located in the slide rail 131, the four moving plates 21 can be circularly unfolded by the driving force of the driving mechanism 3, the slide rail 131 of the moving block 22 can ensure that the moving plates 21 do not have position deviation when moving, when a gear bolt gasket is placed on the inner diameter of the moving plates 21 to punch, the circular arc-shaped position on the moving plates 21 can ensure, the moving plate 21 is prevented from being damaged by the punching drill, so that the service life of the moving plate 21 can be prolonged.

Specifically, the driving mechanism 3 includes a rotating member 31 and a connecting member 32, the rotating member 31 is connected to the connecting member 32, the connecting member 32 is disposed below the moving plate 21, the rotating member 31 is disposed in the upper cover 11, and the operator can rotate the rotating member 31 to provide a driving force to the connecting member 32 to operate the connecting member 32, and the connecting member 32 can provide a driving force to the moving plate 21 to move the moving plate 21 during operation.

Specifically, the rotating member 31 includes a rotating knob 311, a first connecting rod 312, an upper connecting rod 313, a triangular protrusion 314, a lower connecting rod 315, a second connecting rod 316, a first rotating bevel gear 317 and a second rotating bevel gear 318, the rotating knob 311 is disposed above the upper cover plate 11, two ends of the first connecting rod 312 are respectively connected with the rotating knob 311 and the upper connecting rod 313, the upper connecting rod 313 and the lower connecting rod 315 are both disposed in the rectangular hole 111 formed in the upper cover plate 11, the triangular protrusion 314 is disposed below the upper connecting rod 313, a triangular groove 3151 is disposed on the lower connecting rod 315, the triangular groove 3151 is connected with the triangular protrusion 314 in a matching manner, the top end of the second connecting rod 316 is connected with the lower connecting rod 315, the bottom end of the second connecting rod 316 is connected with the first rotating bevel gear 317, the first rotating bevel gear 317 is engaged with the second rotating bevel gear, the second rotating bevel gear 318 is connected with the connecting part 32, when a driving force is required to be provided for the connecting part 32, the first connecting rod 312 can drive the upper connecting rod 313 to rotate by twisting the rotating knob 311, the upper connecting rod 313 can synchronously rotate the lower connecting rod 315 by matching the triangular bump 314 with the triangular groove 3151 arranged on the lower connecting rod 315, the lower connecting rod 315 can rotate to drive the second connecting rod 316 to drive the first rotating bevel gear 317 and the second rotating bevel gear 318 to rotate, and the driving force is transmitted to the connecting part 32 through the second rotating bevel gear 318 to rotate the connecting part 32, when the driving force is not required to be provided for the connecting part 32, the rotating knob 311 can be pulled upwards to enable the upper connecting rod 313 to move into the circular groove 112 and rotate the rotating knob 311 to enable the triangular bump 314 below the upper connecting rod 313 not to correspond to the triangular groove 3151 arranged on the lower connecting rod 315, at this time, the rotating button 311 is twisted to prevent power from being transmitted to the connecting part 32, so that the moving plate 21 cannot be moved by accidentally touching the rotating button 311, the connecting part 32 can be simply and quickly rotated by the above method, and the moving plate 21 cannot be moved by accidentally touching the rotating button 311, so that the situation that the moving plate 21 is accidentally deviated in the working state is reduced, and the rejection rate of gear bolt gaskets is reduced.

Specifically, the connecting member 32 includes a first threaded rod 321, a first bevel gear 322, a second threaded rod 323, a second bevel gear 324, a third threaded rod 325, a third bevel gear 326, a fourth threaded rod 327, a fourth bevel gear 328, four connecting blocks 329 and three fixing posts 3210, the first bevel gear 322, the second bevel gear 324, the third bevel gear 326 and the fourth bevel gear 328 are all disposed below the intersection point of the inner diameters of the four moving plates 21 and are engaged with each other, the first threaded rod 321, the second threaded rod 323, the third threaded rod 325 and the fourth threaded rod 327 are all connected with one connecting block 329, each connecting block 329 is connected with the bottom of one moving plate 21, one end of the first threaded rod 321 is connected with the second rotating bevel gear 318, the other end of the first threaded rod 321 is connected with the first bevel gear 322, and both ends of the second threaded rod 323 are respectively connected with the second bevel gear 324 and one fixing post 3210, the two ends of the third threaded rod 325 are respectively connected with the third bevel gear 326 and a fixing column 3210, the two ends of the fourth bevel gear 328 are respectively connected with the fourth bevel gear 328 and a fixing column 3210, the threads on the first threaded rod 321 and the second threaded rod 323 are clockwise arranged, the threads on the third threaded rod 325 and the fourth threaded rod 327 are counterclockwise arranged, the first threaded rod 321 can drive the first bevel gear 322 to rotate by the driving force provided by the rotating component 31, the first bevel gear 322 can drive the second bevel gear 324 and the fourth bevel gear 328 to rotate, the second bevel gear 324 and the fourth bevel gear 328 can drive the third bevel gear 326 to rotate, at this time, the first bevel gear 322 and the third bevel gear 326 rotate synchronously, the second bevel gear 324 and the fourth bevel gear rotate synchronously, and the threads on the first threaded rod 321 and the third threaded rod 325 are in opposite directions, the second threaded rod 323 and the fourth threaded rod 327 are oppositely arranged, so that the connecting block 329 on the first threaded rod 321 and the connecting block 329 on the third threaded rod 325 move in the opposite direction, the connecting block 329 on the second threaded rod 323 and the connecting block 329 on the fourth threaded rod 327 move in the opposite direction, at this time, the four connecting blocks 329 drive the moving plate 21 to expand respectively, so that the inner diameters of the four moving plates 21 are increased, the four moving plates 21 can be contracted by reversing the rotary knob 311, so that the inner diameters of the four moving plates are reduced, and the driving force of the rotary knob 311 can drive the four moving plates 21 to move simultaneously by the connection mode, compared with the prior art in which each moving plate 21 needs one driving force or every two moving plates 21 need one driving force, the application not only reduces the driving cost, but also can enable the moving plates 21 to move more synchronously, the problem of four movable plates 21 after removing take place the position and differ, gear bolt gasket can't be placed is solved.

The working principle is that the gear bolt gasket is placed on the moving plate 21, if the size is proper, the rotating button 311 can be moved upwards, the rotating button 311 is rotated after the rotating button 311 is lifted, so that the triangular bump 314 and the triangular groove 3151 cannot be matched and connected, the operation can be carried out at the moment, the moving plate 21 can be prevented from moving due to accidental touch of the rotating button 311, the gear bolt gasket in operation is scrapped, when the size of the gear bolt gasket is not matched with the moving plate 21, the rotating button 311 is twisted to enable the first connecting rod 312 to drive the upper connecting column 313 to rotate, the upper connecting column 313 can enable the lower connecting column 315 to synchronously rotate through matching of the triangular bump 314 and the triangular groove 3151 arranged on the lower connecting column 315, the rotation of the lower connecting column 315 can enable the second connecting rod 316 to drive the first rotating bevel gear 317 and the second rotating bevel gear 318 to, and the driving force is transmitted to the first threaded rod 321 through the second rotating bevel gear 318 to rotate the first threaded rod 321, the first threaded rod 321 drives the first bevel gear 322 to rotate when rotating, the first bevel gear 322 drives the second bevel gear 324 and the fourth bevel gear 328 to rotate, the second bevel gear 324 and the fourth bevel gear 328 drive the third bevel gear 326 to rotate, at this time, the first bevel gear 322 and the third bevel gear 326 rotate synchronously, the second bevel gear 324 and the fourth bevel gear rotate synchronously, the threads on the first threaded rod 321 and the third threaded rod 325 are arranged in opposite directions, the threads on the second threaded rod 323 and the fourth threaded rod 327 are arranged in opposite directions, so that the connecting block 329 connected to the first threaded rod 321 and the connecting block 329 connected to the third threaded rod 325 move in opposite directions, the connecting block 329 connected to the second threaded rod 323 and the connecting block 329 connected to the fourth threaded rod 327 move in opposite directions, at this time, the four connecting blocks 329 respectively drive the moving plates 21 to expand, so that the inner diameters of the four moving plates 21 are increased, and the four moving plates 21 can be contracted by the reverse rotation of the rotary knob 311, so that the inner diameters of the four moving plates 21 are reduced. Above can't go to use to the gear bolt gasket of equidimension not with the mould of solving among the prior art, need change the mould according to the size of gear bolt gasket when concrete operation, and this kind of mode just need prepare multiple kind's mould, and the very big influence of specific during operation work has work efficiency and mould cost for the purpose.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The gear bolt gasket composite die is characterized by comprising a fixing mechanism (1), a moving mechanism (2) and a driving mechanism (3), wherein the moving mechanism (2) and the driving mechanism (3) are arranged in the fixing mechanism (1), and the moving mechanism (2) is connected with the driving mechanism (3).

2. The gear bolt gasket composite die is characterized in that the fixing mechanism (1) comprises an upper cover plate (11), a lower cover plate (12) and a bottom bearing plate (13), the upper cover plate (11) and the lower cover plate (12) are correspondingly connected up and down, a rectangular groove (121) is formed in the bottom of the lower cover plate (12), a rectangular hole (111) and a circular groove (112) are formed in the upper cover plate (11), the rectangular hole (111) is formed in the side wall of one side of the upper cover plate (11), the circular groove (112) is formed above the rectangular hole (111), the bottom bearing plate (13) is arranged in the rectangular groove (121), and a slide rail (131) is formed in the bottom bearing plate (13).

3. The gear bolt gasket composite die as claimed in claim 2, wherein the moving mechanism (2) comprises four moving plates (21) and four groups of moving blocks (22), the outer diameters of the four moving plates (21) are rectangular when the four moving plates are tightly attached, each moving plate (21) is provided with an arc-shaped groove, the four moving plates (21) form a circular groove when the four moving plates are tightly attached, the inner sides of the four moving plates (21) are arc-shaped, a circular hole is formed at the position of the arc-shaped groove on the inner sides of the four moving plates (21) when the four moving plates are tightly attached, and each group of moving blocks (22) are respectively and symmetrically arranged below each group of moving plates (21) and are located in the slide way (131).

4. A gear bolt gasket composite die according to claim 3, characterized in that the driving mechanism (3) comprises a rotating part (31) and a connecting part (32), the rotating part (31) is connected with the connecting part (32), the connecting part (32) is arranged below the moving plate (21), and the rotating part (31) is arranged in the upper cover plate (11).

5. The gear bolt gasket composite die as claimed in claim 4, wherein the rotating part (31) comprises a rotating knob (311), a first connecting rod (312), an upper connecting rod (313), a triangular bump (314), a lower connecting rod (315), a second connecting rod (316), a first rotating bevel gear (317) and a second rotating bevel gear (318), the rotating knob (311) is arranged above the upper cover plate (11), two ends of the first connecting rod (312) are respectively connected with the rotating knob (311) and the upper connecting rod (313), the upper connecting rod (313) and the lower connecting rod (315) are both arranged in a rectangular hole (111) formed in the upper cover plate (11), the triangular bump (314) is arranged below the upper connecting rod (313), and a triangular groove (3151) is formed in the lower connecting rod (315), the triangular groove (3151) is connected with the triangular bump (314) in a matching mode, the top end of the second connecting rod (316) is connected with the lower connecting column (315), the bottom end of the second connecting rod (316) is connected with the first rotating bevel gear (317), the first rotating bevel gear (317) is meshed with the second rotating bevel gear (318), and the second rotating bevel gear (318) is connected with the connecting part (32).

6. A gear-bolt-gasket composite die as claimed in claim 5, wherein the connecting member (32) comprises a first threaded rod (321), a first bevel gear (322), a second threaded rod (323), a second bevel gear (324), a third threaded rod (325), a third bevel gear (326), a fourth threaded rod (327), a fourth bevel gear (328), four connecting blocks (329) and three fixing posts (3210), the first bevel gear (322), the second bevel gear (324), the third bevel gear (326) and the fourth bevel gear (328) are all arranged below the inner diameter intersection points of the four moving plates (21) and are engaged with each other, a connecting block (329) is connected to each of the first threaded rod (321), the second threaded rod (323), the third threaded rod (325) and the fourth threaded rod (327), and each connecting block (329) is connected to the bottom of one moving plate (21), one end of the first threaded rod (321) is connected with the second rotating bevel gear (318), the other end of the first threaded rod (321) is connected with the first bevel gear (322), two ends of the second threaded rod (323) are respectively connected with the second bevel gear (324) and a fixing column (3210), two ends of the third threaded rod (325) are respectively connected with the third bevel gear (326) and the fixing column (3210), two ends of the fourth bevel gear (328) are respectively connected with the fourth bevel gear (328) and the fixing column (3210), threads on the first threaded rod (321) and the second threaded rod (323) are clockwise arranged, and threads on the third threaded rod (325) and the fourth threaded rod (327) are anticlockwise arranged.