CN216228644U

CN216228644U - Automatic grinding device of die-casting aluminum

Info

Publication number: CN216228644U
Application number: CN202122545215.XU
Authority: CN
Inventors: 卢进军; 王华忠; 肖康付
Original assignee: Huizhou Jingrui Automation Machinery Co ltd
Current assignee: Huizhou Jingrui Automation Machinery Co ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-04-08
Anticipated expiration: 2031-10-21

Abstract

The utility model discloses an automatic polishing device for die-cast aluminum, which relates to the technical field of aluminum die-casting processing and comprises a polisher, a moving mechanism, two groups of connecting mechanisms, two groups of driving mechanisms and two groups of clamping mechanisms, wherein the polisher is arranged on one side of the moving mechanism; the problem of among the prior art with press from both sides tight anchor clamps that polish of pressing from both sides to the die casting relatively single, the die casting shape that this anchor clamps pressed from both sides tightly can only be fixed shape, can't use when to different types of die casting, the practicality is relatively poor is solved.

Description

Automatic grinding device of die-casting aluminum

Technical Field

The utility model relates to the technical field of aluminum die casting machining, in particular to an automatic polishing device for die casting aluminum

Background

An aluminum die casting is a part which is manufactured by using a pressure casting machine equipped with a casting die, pouring aluminum or an aluminum alloy which is heated to be in a liquid state into a feeding port of the die casting machine, and casting the aluminum part or the aluminum alloy part which has a shape and a size limited by the die casting machine.

Aluminum die casting need polish the processing in the course of working to make the casting surface have good smoothness, the mode that usually adopts among the prior art is that the handheld work piece of operator directly polishes, especially to the work piece that the volume is great, the shape is complicated, can not effectual uniformity and the standardized operation of guaranteeing to polish, the work protection effect is not good enough moreover, thereby influences the quality of product.

The patent No. CN201611155870.1 discloses a clamp for die casting grinding, which comprises a bottom plate, a first side plate and a second side plate are vertically arranged on the bottom plate, a first cylindrical pin is transversely and convexly arranged on the first side plate towards the second side plate, the utility model provides a locking mechanism is installed to the second curb plate for with the round hole cooperation of die casting terminal surface, locking mechanism includes first connecting plate, the second connecting plate, push pedal and clamp plate, first screw connection is passed through in the second curb plate to the one end of first connecting plate, the other end passes through movable screw and connects in the one end of second connecting plate, the other end of second connecting plate passes through second screw connection in the push pedal, the fixed surface that the push pedal is close to the second curb plate has the slider, transversely be equipped with the guide rail on the second curb plate, the slider is installed on the guide rail, the clamp plate is fixed in the push pedal, the clamp plate is equipped with second cylindric lock and clamp block towards the horizontal protruding of first curb plate, be used for with the round hole and the boss cooperation of die casting's another terminal surface. The clamp disclosed by the utility model is accurate in positioning, simple in clamping, suitable for large-scale processing of products and capable of improving the production efficiency.

Be used for assisting anchor clamps that die casting ground more single in the above-mentioned patent, the die casting shape that presss from both sides tightly can only be fixed shape, can't use when die casting to equidimension not, and the practicality is relatively poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an automatic grinding device for die-cast aluminum, which aims to solve the problems in the background technology.

The embodiment of the utility model adopts the following technical scheme: the utility model provides an automatic grinding device of die-casting aluminium, includes polisher, moving mechanism, coupling mechanism, actuating mechanism and clamping mechanism, the polisher sets up one side at moving mechanism, coupling mechanism, actuating mechanism and clamping mechanism all are equipped with two sets ofly, and are two sets of the coupling mechanism symmetry sets up in moving mechanism's top, and is two sets of coupling mechanism's bottom all is connected with moving mechanism's work end, every group actuating mechanism all sets up wherein a set of coupling mechanism's top, every group clamping mechanism all sets up on one side of one of them a set of actuating mechanism, and every group clamping mechanism all is connected with one of them a set of actuating mechanism's work end, and is two sets of clamping mechanism is the level and corresponds, the work end of polisher is located two sets of clamping mechanism's top.

Further, the moving mechanism comprises a moving placing box and a bidirectional screw rod sliding table, the bidirectional screw rod sliding table is arranged in the moving placing box, two first linear holes are symmetrically formed in the moving placing box, and two working ends of the bidirectional screw rod sliding table are connected with a group of connecting mechanisms respectively.

Further, every group coupling mechanism all includes connecting block, connecting plate, spliced pole, movable plate and loading board, connecting block and connecting plate all set up and are placing the incasement in the removal, the one end of connecting block is connected with the work end of two-way lead screw slip table, the other end and the connecting plate of connecting block are connected, the spliced pole is equipped with two, two the bottom symmetry of spliced pole sets up in the top of connecting plate, two the spliced pole is located one respectively the first style of calligraphy is downthehole, two the top of spliced pole all is connected with the movable plate, the movable plate sets up and is moving the top of placing the case, the loading board sets up on the movable plate.

Further, every group actuating mechanism all includes rotatory case, driving motor, connecting rod and the bearer post of placing, the rotatory case setting of placing is on one side of loading board, driving motor sets up rotatory incasement of placing, the one end of connecting rod is located rotatory incasement of placing, and the one end and the output of driving motor of connecting rod are connected, the other end of connecting rod runs through the rotation and places the case and extend to outside the rotatory case of placing, the other end and the bearer post of connecting rod are connected, the inside cavity that is of bearer post, all seted up the first style of calligraphy hole of second on the upper and lower both ends of bearer post, the bearer post is connected with clamping mechanism.

Further, each group of clamping mechanisms comprises a first clamping assembly and a second clamping assembly, the first clamping assembly is arranged on one side of the bearing column, and the second clamping assembly is arranged on one side of the first clamping assembly.

Further, the first clamping assembly comprises an air cylinder, a movable connecting plate, a placing plate, two clamp connecting rods, a clamp fixing plate, a double-rod bidirectional air cylinder, a connecting frame and a first chuck, the air cylinder is arranged in the bearing column, the output end of the air cylinder is connected with the movable connecting plate, the upper end and the lower end of the movable connecting plate both penetrate through a second linear hole arranged on the bearing column and extend out, a third linear hole is symmetrically arranged on the movable connecting plate, the placing plate is arranged on one side of the bearing column, a fourth linear hole is symmetrically arranged on the placing plate, the third linear hole horizontally corresponds to the fourth linear hole, two clamp connecting rods are arranged, one end of each of the two clamp connecting rods is symmetrically arranged on the movable connecting plate, and one end of each clamp connecting rod is positioned in the third linear hole arranged on the movable connecting plate, two the other end of anchor clamps connecting rod all runs through the fourth style of calligraphy hole that is equipped with on placing the board and extends, the anchor clamps fixed plate is equipped with two, every the anchor clamps fixed plate sets up respectively on one end of an anchor clamps connecting rod, through the anchor clamps fixed plate makes the fixed setting of one end of anchor clamps connecting rod in the mobile connection board, first chuck is equipped with two, every first chuck all sets up on the other end of an anchor clamps connecting rod, two pole two-way cylinder sets up on one side of placing the board, the link is equipped with two, every the one end of link all is connected with a working end of two pole two-way cylinder, every the other end of link is all established on the anchor clamps connecting rod.

Furthermore, the second clamping assembly comprises a clamp fixing rod and a second chuck, the clamp fixing rod is arranged on the placing plate and located between the two clamp connecting rods, the second chuck is arranged on the clamp fixing rod, and the second chuck is arc-shaped.

The embodiment of the utility model adopts at least one technical scheme which can achieve the following beneficial effects:

firstly, the die casting is placed between the two groups of clamping mechanisms, the two ends of the die casting are clamped through the two groups of clamping mechanisms, the distance between the two groups of clamping mechanisms can be adjusted through the moving mechanism, the situation that the two groups of clamping mechanisms cannot clamp the die casting due to the fact that the die casting is too large or too small is prevented, then the die casting is driven by the grinding machine to be ground, and in the grinding process, the clamping mechanisms can drive the die casting to rotate through the rotating mechanism, so that the grinding machine can be used for grinding other positions of the die casting; the problem of among the prior art with press from both sides tight anchor clamps that polish of pressing from both sides to the die casting relatively single, the die casting shape that this anchor clamps pressed from both sides tightly can only be fixed shape, can't use when the die casting to equidimension not, the practicality is relatively poor is solved.

Secondly, the connecting rod can drive the bearing column to rotate through the operation of the driving motor, and the bearing column can drive the clamping mechanism to synchronously rotate when rotating, so that other positions of the die casting correspond to the grinding machine when the clamping mechanism clamps the die casting to grind, and multidirectional grinding operation is performed, and the practicability of the die casting grinding machine is improved.

Thirdly, performing; according to the die casting grinding machine, the first clamping assembly and the second clamping assembly are different in clamping type of die castings, when the die casting grinding machine is normally used, the second clamping assembly does not need to clamp the die castings when the first clamping assembly works, similarly, when the second clamping assembly clamps the die castings, the first clamping assembly does not need to clamp the die castings, and when necessary, the first clamping assembly and the second clamping assembly can be matched with each other for use, and the first clamping assembly and the second clamping assembly can be matched with the moving mechanism or the rotating mechanism, so that die castings of different sizes and different types can be clamped, and the grinding effect of different die castings is further improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of a moving mechanism according to the present invention;

FIG. 3 is a first partial schematic view of the present invention;

FIG. 4 is a second partial schematic view of the present invention;

FIG. 5 is a partial perspective cut-away view of the present invention;

fig. 6 is a partial schematic view of a clamping mechanism of the present invention.

Reference numerals:grinding machine 1, moving mechanism 2, moving placing box 21, bidirectional screw rod sliding table 22, first straight-line-shaped hole 211, connecting mechanism 3, connecting block 31, connecting plate 32, connecting column 33, moving plate 34, bearing plate 35, driving mechanism 4, rotating placing box 41, driving motor 42, connecting rod 43, bearing column 44, second straight-line-shaped hole 441, clamping mechanism 5, first clamping assembly 51, air cylinder 511, moving connecting plate 512, clamp connecting rod 514, clamp fixing plate 515, double-rod bidirectional air cylinder 516, connecting frame 517, first chuck 518, third straight-line-shaped hole 519, fourth straight-line-shaped hole 5110, second clamping assembly 52, clamp fixing rod 521 and second chuck 522。

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to fig. 1-6, the embodiment of the utility model provides an automatic grinding device for die-casting aluminum, which comprises a grinding machine 1, a moving mechanism 2, a connecting mechanism 3, a driving mechanism 4 and a clamping mechanism 5, the grinding machine 1 is arranged at one side of the moving mechanism 2, two groups of connecting mechanisms 3, two groups of driving mechanisms 4 and two groups of clamping mechanisms 5 are arranged, the two groups of connecting mechanisms 3 are symmetrically arranged above the moving mechanism 2, the bottom ends of the two groups of connecting mechanisms 3 are connected with the working end of the moving mechanism 2, each group of driving mechanisms 4 is arranged above one group of the connecting mechanisms 3, each group of clamping mechanisms 5 is arranged on one side of one group of the driving mechanisms 4, each group of clamping mechanisms 5 is connected with the working end of one group of driving mechanisms 4, the two groups of clamping mechanisms 5 horizontally correspond to each other, and the working end of the grinding machine 1 is positioned above the two groups of clamping mechanisms 5; the clamping mechanisms 5 can clamp various die castings and perform polishing operation, so that the die castings are placed between the two groups of clamping mechanisms 5 when in operation, two ends of the die castings are clamped through the two groups of clamping mechanisms 5, the distance between the two groups of clamping mechanisms 5 can be adjusted through the moving mechanism 2 at the moment, the situation that the two groups of clamping mechanisms 5 cannot clamp the die castings due to overlarge or undersize of the die castings is prevented, then the polishing machine 1 drives the die castings to perform polishing operation, and in the polishing process, the clamping mechanisms 5 can drive the die castings to rotate through the rotating mechanism, so that the polishing machine 1 performs polishing operation on other positions of the die castings; the problem of among the prior art with press from both sides tight anchor clamps that polish of pressing from both sides to the die casting relatively single, the die casting shape that this anchor clamps pressed from both sides tightly can only be fixed shape, can't use when to different types of die casting, the practicality is relatively poor is solved.

Specifically, referring to fig. 2, the moving mechanism 2 includes a moving placing box 21 and a bidirectional screw rod sliding table 22, the bidirectional screw rod sliding table 22 is disposed in the moving placing box 21, two first straight holes 211 are symmetrically formed in the moving placing box 21, and two working ends of the bidirectional screw rod sliding table 22 are respectively connected to a group of connecting mechanisms 3; the two sets of connecting mechanisms 3 can be moved toward or away from each other by driving the bidirectional screw sliding table 22, so that the distance between the two sets of clamping mechanisms 5 can be adjusted.

Specifically, refer to fig. 3-4 and show, every group coupling mechanism 3 all includes connecting block 31, connecting plate 32, spliced pole 33, movable plate 34 and loading board 35, connecting block 31 and connecting plate 32 all set up and are moving and place the case 21 in, the one end of connecting block 31 is connected with the work end of two-way lead screw slip table 22, the other end of connecting block 31 is connected with connecting plate 32, spliced pole 33 is equipped with two, two the bottom symmetry of spliced pole 33 sets up in the top of connecting plate 32, two spliced pole 33 is located one respectively in the first style of calligraphy hole 211, two the top of spliced pole 33 all is connected with movable plate 34, movable plate 34 sets up and is moving the top of placing case 21, loading board 35 sets up on movable plate 34.

Specifically, referring to fig. 4 to 5, each set of driving mechanisms 4 includes a rotating placement box 41, a driving motor 42, a connecting rod 43 and a bearing column 44, the rotating placement box 41 is disposed on one side of the bearing plate 35, the driving motor 42 is disposed in the rotating placement box 41, one end of the connecting rod 43 is located in the rotating placement box 41, one end of the connecting rod 43 is connected to an output end of the driving motor 42, the other end of the connecting rod 43 penetrates through the rotating placement box 41 and extends out of the rotating placement box 41, the other end of the connecting rod 43 is connected to the bearing column 44, the interior of the bearing column 44 is hollow, the upper end and the lower end of the bearing column 44 are both provided with a second linear hole 441, and the bearing column 44 is connected to the clamping mechanism 5; can make connecting rod 43 drive carrier post 44 rotate through driving motor 42's operation, carrier post 44 can drive clamping mechanism 5 when rotatory and rotate in step to can make clamping mechanism 5 when pressing from both sides tight die casting and polish, let other positions of die casting correspond with polisher 1, thereby carry out diversified operation of polishing.

Specifically, as shown in fig. 5 to 6, each set of the clamping mechanisms 5 includes a first clamping assembly 51 and a second clamping assembly 52, the first clamping assembly 51 is disposed on one side of the bearing column 44, the second clamping assembly 52 is disposed on one side of the first clamping assembly 51, and the first clamping assembly 51 and the second clamping assembly 52 clamp different die castings respectively; in the utility model, the first clamping assembly 51 and the second clamping assembly 52 clamp die castings in different types, when in normal use, the second clamping assembly 52 does not need to clamp the die castings when the first clamping assembly 51 works, similarly, when the second clamping assembly 52 clamps the die castings, the first clamping assembly 51 does not need to clamp the die castings, and when necessary, the first clamping assembly 51 and the second clamping assembly 52 can be matched with each other, and the first clamping assembly 51 and the second clamping assembly 52 can be matched with the moving mechanism 2 or the rotating mechanism, so that die castings with different sizes can be clamped.

Specifically, referring to fig. 5 to 6, the first clamping assembly 51 includes an air cylinder 511, a movable connecting plate 512, a placing plate, a clamp connecting rod 514, a clamp fixing plate 515, a two-rod bidirectional air cylinder 516, a connecting frame 517 and a first clamping head 518, the air cylinder 511 is disposed in the bearing column 44, an output end of the air cylinder 511 is connected to the movable connecting plate 512, upper and lower ends of the movable connecting plate 512 penetrate through a second linear hole 441 disposed on the bearing column 44 and extend out, the movable connecting plate 512 is symmetrically provided with third linear holes 519, the placing plate is disposed on one side of the bearing column 44, the placing plate is symmetrically provided with fourth linear holes 5110, the third linear holes 519 horizontally correspond to the fourth linear holes 5110, the clamp connecting rods 514 are provided with two, one ends of the two clamp connecting rods 514 are symmetrically disposed on the movable connecting plate 512, one end of each clamp connecting rod 514 is positioned in a third linear hole 519 arranged on the movable connecting plate 512, the other end of each clamp connecting rod 514 penetrates through a fourth linear hole 5110 arranged on the placing plate and extends out, two clamp fixing plates 515 are provided, each clamp fixing plate 515 is provided at one end of one clamp connecting rod 514, one end of the clamp connecting rod 514 is fixedly disposed in the moving connecting plate 512 by the clamp fixing plate 515, two first collets 518 are provided, each of the first collets 518 being provided on the other end of one of the jig connecting rods 514, the double-rod bidirectional cylinder 516 is arranged on one side of the placing plate, two connecting frames 517 are arranged, one end of each connecting frame 517 is connected with one working end of the double-rod bidirectional cylinder 516, and the other end of each connecting frame 517 is sleeved on the clamp connecting rod 514; during operation, the movable connecting plate 512 can move in the bearing column 44 through the air cylinder 511, the moving track of the movable connecting plate 512 can be limited through the second linear hole 441 arranged on the bearing column 44, the two clamp connecting rods 514 can be driven to synchronously move through the movable connecting plate 512, so that the two first clamp heads 518 can extend and retract, the operation can be performed according to the type of die-casting parts, the two clamp connecting rods 514 can perform clamping operation through the driving of the double-rod bidirectional air cylinder 516, and the connecting frame 517 does not influence the extension and retraction of the clamp connecting rods 514.

Specifically, referring to fig. 5 to 6, the second clamping assembly 52 includes a clamp fixing rod 521 and a second clamping head 522, the clamp fixing rod 521 is disposed on the placing plate, the clamp fixing rod 521 is located between the two clamp connecting rods 514, the second clamping head 522 is disposed on the clamp fixing rod, and the second clamping head 522 is in an arc shape; the second collet 522 of the present invention is generally used for clamping a die casting having a circular, spherical or arc-shaped corner, and may be used in conjunction with the first collet 518 to clamp the die casting if necessary.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The automatic grinding device for die-cast aluminum comprises a grinding machine (1) and is characterized by further comprising a moving mechanism (2), a connecting mechanism (3), a driving mechanism (4) and a clamping mechanism (5), wherein the grinding machine (1) is arranged on one side of the moving mechanism (2), the connecting mechanism (3), the driving mechanism (4) and the clamping mechanism (5) are respectively provided with two groups, the two groups of connecting mechanisms (3) are symmetrically arranged above the moving mechanism (2), the bottom ends of the two groups of connecting mechanisms (3) are respectively connected with the working end of the moving mechanism (2), each group of driving mechanism (4) is respectively arranged above one group of connecting mechanism (3), each group of clamping mechanism (5) is respectively arranged on one side of one group of driving mechanisms (4), and each group of clamping mechanism (5) is respectively connected with the working end of one group of driving mechanism (4), two sets of clamping mechanism (5) are the level and correspond, the work end of polisher (1) is located two sets of clamping mechanism's (5) top.

2. The automatic grinding device of die-casting aluminum according to claim 1, wherein the moving mechanism (2) comprises a moving placing box (21) and a bidirectional screw rod sliding table (22), the bidirectional screw rod sliding table (22) is arranged in the moving placing box (21), two first straight holes (211) are symmetrically formed in the moving placing box (21), and two working ends of the bidirectional screw rod sliding table (22) are respectively connected with a group of connecting mechanisms (3).

3. The automatic grinding device of die-cast aluminum according to claim 2, wherein each group of the connecting mechanisms (3) comprises a connecting block (31), a connecting plate (32), connecting columns (33), a movable plate (34) and a bearing plate (35), the connecting blocks (31) and the connecting plates (32) are arranged in the movable placement box (21), one end of the connecting block (31) is connected with the working end of a bidirectional screw rod sliding table (22), the other end of the connecting block (31) is connected with the connecting plate (32), the connecting columns (33) are provided with two, the bottom ends of the two connecting columns (33) are symmetrically arranged above the connecting plate (32), the two connecting columns (33) are respectively located in one first I-shaped hole (211), the top ends of the two connecting columns (33) are connected with the movable plate (34), the movable plate (34) is arranged above the movable placement box (21), the bearing plate (35) is arranged on the moving plate (34).

4. The automatic grinding device for die-cast aluminum according to claim 3, wherein each set of driving mechanism (4) comprises a rotary placing box (41), a driving motor (42), a connecting rod (43) and a bearing column (44), the rotary placing box (41) is arranged on one side of the bearing plate (35), the driving motor (42) is arranged in the rotary placing box (41), one end of the connecting rod (43) is connected with the output end of the driving motor (42), the other end of the connecting rod (43) penetrates through the rotary placing box (41) and extends out of the rotary placing box (41), the other end of the connecting rod (43) is connected with the bearing column (44), the bearing column (44) is hollow, and second straight holes (441) are formed on the upper end and the lower end of the bearing column (44), the bearing column (44) is connected with the clamping mechanism (5).

5. The automatic grinding device for die-cast aluminum according to claim 4, wherein each set of clamping mechanisms (5) comprises a first clamping assembly (51) and a second clamping assembly (52), the first clamping assembly (51) is arranged on one side of the bearing column (44), and the second clamping assembly (52) is arranged on one side of the first clamping assembly (51).

6. The automatic grinding device for die-cast aluminum according to claim 5, wherein the first clamping assembly (51) comprises an air cylinder (511), a movable connecting plate (512), a placing plate, a clamp connecting rod (514), a clamp fixing plate (515), a double-rod bidirectional air cylinder (516), a connecting frame (517) and a first clamping head (518), the air cylinder (511) is arranged in the bearing column (44), the output end of the air cylinder (511) is connected with the movable connecting plate (512), the upper end and the lower end of the movable connecting plate (512) both penetrate through a second straight-line-shaped hole (441) formed in the bearing column (44) and extend out, a third straight-line-shaped hole (519) is symmetrically formed in the movable connecting plate (512), the placing plate is arranged on one side of the bearing column (44), a fourth straight-line-shaped hole (5110) is symmetrically formed in the placing plate, and the third straight-line-shaped hole (519) horizontally corresponds to the fourth straight-line-shaped hole (5110), the clamp fixing plates (515) are provided with two clamp connecting rods (514), one ends of the two clamp connecting rods (514) are symmetrically arranged on the movable connecting plate (512), one end of each clamp connecting rod (514) is positioned in a third linear hole (519) formed in the movable connecting plate (512), the other ends of the two clamp connecting rods (514) penetrate through a fourth linear hole (5110) formed in the placing plate and extend out, each clamp fixing plate (515) is respectively arranged at one end of one clamp connecting rod (514), one end of each clamp connecting rod (514) is fixedly arranged in the movable connecting plate (512) through the clamp fixing plate (515), the number of the first chucks (518) is two, and each first chuck (518) is arranged at the other end of one clamp connecting rod (514), the double-rod bidirectional cylinder (516) is arranged on one side of the placing plate, the connecting frames (517) are two, one end of each connecting frame (517) is connected with one working end of the double-rod bidirectional cylinder (516), and the other end of each connecting frame (517) is sleeved on the clamp connecting rod (514).

7. The automatic grinding device for die-cast aluminum according to claim 6, wherein the second clamping assembly (52) comprises a clamp fixing rod (521) and a second clamping head (522), the clamp fixing rod (521) is arranged on the placing plate, the clamp fixing rod (521) is located between the two clamp connecting rods (514), the second clamping head (522) is arranged on the clamp fixing rod, and the second clamping head (522) is arc-shaped.