Hard disk substrate turning suction cup tool

Abstract

The invention belongs to the technical field of suction cup tools, particularly relates to a hard disk substrate turning suction cup tool, and aims to solve the problems that positioning is inconvenient due to friction force between a suction cup and a substrate, a gap may exist between the substrate and the suction cup, and the adsorption effect is affected. A workbench and a fixing plate frame are fixedly connected to the inner wall of the mounting main body, a positioning operation module is arranged in the mounting main body, and the same suction cup module is arranged on the fixing plate frame and the workbench; the positioning operation module comprises a rotating table, a first annular groove is formed in the inner wall of the bottom of the mounting body, and the rotating table is movably connected into the first annular groove. According to the hard disk substrate turning suction cup tool, the hard disk substrate can be pushed to the center position to be positioned through the positioning operation module, meanwhile, a gap between the substrate and the suction cup can be eliminated, the substrate and the suction cup can be better attached, and the situation that the suction effect is affected, and consequently the substrate deviates is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of suction cup tooling, and in particular to a suction cup tooling for turning a hard disk substrate. Background Art

[0002] The hard disk substrate is one of the key components of the hard disk. It is the basic medium for storing data on the hard disk. Its main function is to provide a smooth and flat surface for the magnetic recording layer. It is usually a circular thin sheet, and its material is generally glass or aluminum alloy. The glass substrate has high hardness, smoothness and stability, which can allow the magnetic head to fly stably very close to its surface to ensure the accuracy of data reading and writing. The aluminum alloy substrate has low cost and good mechanical properties. Magnetic materials are coated on the surface of the hard disk substrate through a special process to form a magnetic recording layer for storing binary data. These data are distributed on the substrate in the form of tracks and sectors. The magnetic head moves above the high-speed rotating substrate to write and read data by changing the magnetic state of the magnetic recording layer.

[0003] In the prior art, before turning, the hard disk substrate is directly placed on the suction cup. Due to the friction between the suction cup and the substrate, it is not convenient to directly position the substrate, which affects subsequent processing. In addition, since the substrate itself is relatively light, there may be a gap between the substrate and the suction cup, which affects the adsorption effect and causes the substrate to shift. Summary of the invention

[0004] The invention discloses a hard disk substrate turning suction cup tooling, aiming to solve the technical problems in the background technology that the friction between the suction cup and the substrate makes it difficult to position the suction cup, and there may be a gap between the substrate and the suction cup, which affects the adsorption effect and causes the substrate to shift.

[0005] The present invention proposes a hard disk substrate turning suction cup tooling, comprising an installation body, the inner wall of the installation body is fixedly connected to a workbench and a fixed plate frame, and a positioning operation module is arranged inside the installation body, and the same suction cup module is arranged on the fixed plate frame and the workbench; the positioning operation module comprises a rotating table, and an annular groove one is opened on the bottom inner wall of the installation body, the rotating table is movably connected in the annular groove one, a plurality of circular holes one are opened on the rotating table at equal intervals in the circumference, a fixed shaft is fixedly connected in the plurality of circular holes one, and a special-shaped connecting rod is movably connected to the outer walls of the plurality of fixed shafts; the suction cup module comprises an air bin, and a sliding slot hole one is opened on the workbench, the air bin slides in the sliding slot hole one, a plurality of circular holes two are opened on the air bin at equal intervals, a suction cup member is fixedly connected in the plurality of circular holes two.

[0006] In a preferred embodiment, a plurality of the special-shaped connecting rods are provided with circular holes three, a plurality of circular holes three are movably connected with sliding tables, and a plurality of sliding slot holes two are equidistantly provided on the circumference of the workbench, and a plurality of sliding tables slide in corresponding sliding slot holes two.

[0007] In a preferred solution, the tops of the multiple sliding tables are fixedly connected with mounting frames, the multiple mounting frames are provided with mounting holes one and two, and the multiple mounting holes one are fixedly connected with resistance blocks, the multiple mounting holes two are fixedly connected with electric push rods, and the driving ends of the multiple electric push rods are fixedly connected with pressing plates.

[0008] In a preferred solution, a gear ring is fixedly connected to the outer wall of the rotating table, and a hydraulic rod is fixedly connected to the bottom inner wall of the mounting body, a gear rod is fixedly connected to the driving end of the hydraulic rod, and the gear rod and the gear ring are meshed with each other.

[0009] In a preferred embodiment, the bottom of the workbench is fixedly connected to a connecting warehouse, and a plurality of circular holes four corresponding to each other are evenly spaced on the workbench and the connecting warehouse, a plurality of circular holes four are fixedly connected to piston cylinder parts, the inner walls of a plurality of piston cylinder parts are slidably connected to piston plates, the tops of a plurality of piston plates are fixedly connected to support rods, and the tops of a plurality of support rods are fixedly connected to universal ball parts.

[0010] In a preferred solution, an air pump is fixedly connected to the top of the fixed plate frame, and a connecting pipe is fixedly connected to the output end of the air pump, and one end of the connecting pipe away from the air pump is fixedly connected to the connecting chamber.

[0011] By providing a positioning operation module, before the turning process begins, air is sent into the connecting chamber through the connecting pipe by an air pump, forcing the piston plate to slide in the piston cylinder, pushing the support rod and the universal ball part to rise, and placing the hard disk substrate on the universal ball part. Then the hydraulic rod is started to push and pull the gear rod, and the rotating table is rotated through the engagement of the gear ring, forcing the special-shaped connecting rod to rotate outside the fixed shaft, pulling the sliding table and the mounting frame to move toward the center, and the substrate is made to slide on the universal ball part through the stop block until the substrate reaches the center position to complete the positioning, which can prevent the friction between the suction cup and the substrate from causing inconvenience in direct positioning, and facilitate subsequent processing. At the same time, the electric push rod is used to push the pressing plate downward to press the substrate, which can eliminate the gap between the substrate and the suction cup part, make the substrate and the suction cup part fit more closely, and prevent the adsorption effect from being affected and causing the substrate to shift.

[0012] In a preferred embodiment, a negative pressure pump is fixedly connected to the bottom of the gas bin, and a mounting platform is fixedly connected to the top of the fixed plate frame. A plurality of mounting grooves are equidistantly arranged on the mounting platform, and mounting cylinders are fixedly connected to the plurality of mounting grooves.

[0013] In a preferred embodiment, the inner walls of the multiple mounting cylinders are slidably connected to sliding parts, and springs are arranged in the multiple mounting cylinders, one end of the multiple springs is fixedly connected to the inner wall of the corresponding mounting cylinder, and the other end is fixedly connected to the corresponding sliding part.

[0014] In a preferred solution, the mounting platform is provided with an annular groove II, a winding wheel is movably connected in the annular groove II, and an electric motor is fixedly connected to the top of the mounting platform, a driving end of the motor is fixedly connected to a rotating frame, an outer wall of the rotating frame is fixedly connected to an inner wall of the winding wheel, a plurality of winding ropes are wrapped around the outside of the winding wheel, and ends of the plurality of winding ropes away from the winding wheel are fixedly connected to corresponding sliding members.

[0015] In a preferred embodiment, a plurality of fixing parts are fixedly connected to the bottom circumference of the gas bin at equal intervals, and a plurality of sliding parts are fixedly connected to an arc-shaped connecting rod on one side away from the winding rope, a plurality of arc-shaped connecting rods are provided with a circular hole five at one end away from the sliding part, a thin rod is fixedly connected to the inside of the plurality of circular holes five, a connecting plate is movably connected to the outer walls of the plurality of thin rods, and a plurality of connecting plates are movably connected to the corresponding fixing parts at one end away from the arc-shaped connecting rod.

[0016] By providing a suction cup module, after the hard disk substrate is positioned, the rotating frame is rotated by the motor to drive the winding wheel to rotate and relax the winding rope. The sliding part and the arc-shaped connecting rod are pushed by the elastic action of the spring, forcing the connecting plate to push the air chamber to rise. When the suction cup part contacts the substrate, the air chamber is in a negative pressure state through the negative pressure pump, and the substrate is fixed by the suction cup part. The suction cup part can be retracted into the device when not in use to prevent damage caused by collision with other objects, thereby improving applicability. When in use, the suction cup part is extended to better fit the surface of the substrate to ensure the adsorption effect.

[0017] From the above, it can be seen that the hard disk substrate turning suction cup tooling provided by the present invention can push the randomly placed hard disk substrate to the center position of the tooling for positioning through the positioning operation module before turning processing, which is convenient for subsequent turning processing. At the same time, by pressing the hard disk substrate, the gap between the substrate and the suction cup can be eliminated, so that the substrate and the suction cup can fit more closely, preventing the adsorption effect from being affected and causing the substrate to shift, and the suction cup can be retracted into the device when not in use to prevent damage caused by collision with other objects. When in use, it can be extended to better fit the surface of the substrate to ensure the beneficial effect of the adsorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a hard disk substrate turning suction cup tooling proposed by the present invention; Figure 2 This is a cross-sectional view of the internal structure of a hard disk substrate turning suction cup tooling proposed by the present invention; Figure 3 This is a schematic diagram of the bottom structure of a rotating table of a positioning operation module of a hard disk substrate turning suction cup tooling proposed by the present invention; Figure 4 This is a structural schematic diagram of the rotating table of a positioning operation module of a hard disk substrate turning suction cup tooling proposed by the present invention; Figure 5 This is a schematic diagram of the bottom structure of a connecting chamber of a hard disk substrate turning suction cup tooling proposed by the present invention; Figure 6 This is a structural schematic diagram of a suction cup module installation platform of a hard disk substrate turning suction cup tooling proposed by the present invention; Figure 7 This is a cross-sectional view of the internal structure of a suction cup module mounting cylinder of a hard disk substrate turning suction cup tooling proposed by the present invention.

[0019] In the figure: 1. Installation body; 2. Positioning operation module; 201. Rotating table; 202. Gear ring; 203. Hydraulic rod; 204. Gear rod; 205. Fixed shaft; 206. Special-shaped connecting rod; 207. Sliding table; 208. Mounting frame; 209. Electric push rod; 210. Block; 211. Pressing plate; 212. Connecting chamber; 213. Piston cylinder; 214. Piston plate; 215. Support rod; 216. Universal ball bearing ; 217, air pump; 218, connecting pipe; 3, suction cup module; 301, air chamber; 302, negative pressure pump; 303, suction cup member; 304, fixing member; 305, winding wheel; 306, mounting table; 307, motor; 308, rotating frame; 309, connecting plate member; 310, winding rope; 311, mounting cylinder member; 312, sliding member; 313, spring; 314, arc-shaped connecting rod; 4, workbench; 5, fixed plate frame. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] The hard disk substrate turning suction cup tool disclosed in the present invention is mainly used in the scenario where the friction between the suction cup and the substrate makes positioning inconvenient, and there may be a gap between the substrate and the suction cup, which affects the adsorption effect and causes the substrate to shift.

[0022] Reference Figure 1-7A hard disk substrate turning suction cup tooling comprises an installation body 1, the inner wall of the installation body 1 is fixedly connected with a workbench 4 and a fixed plate frame 5, and a positioning operation module 2 is arranged inside the installation body 1, and the same suction cup module 3 is arranged on the fixed plate frame 5 and the workbench 4; the positioning operation module 2 comprises a rotating table 201, and an annular groove 1 is opened on the bottom inner wall of the installation body 1, the rotating table 201 is movably connected in the annular groove 1, a plurality of circular holes 1 are opened on the rotating table 201 at equal intervals, a fixed shaft 205 is fixedly connected in the plurality of circular holes 1, and a special-shaped connecting rod 206 is movably connected to the outer walls of the plurality of fixed shafts 205; the suction cup module 3 comprises an air bin 301, and a sliding slot hole 1 is opened on the workbench 4, the air bin 301 slides in the sliding slot hole 1, a plurality of circular holes 2 are opened on the air bin 301 at equal intervals, and a suction cup member 303 is fixedly connected in the plurality of circular holes 2.

[0023] Reference Figure 1 , Figure 2 and Figure 3 , multiple special-shaped connecting rods 206 are each provided with a circular hole three, and multiple circular holes three are movably connected with a sliding platform 207, and multiple sliding slot holes two are equidistantly provided on the circumference of the workbench 4, and multiple sliding platforms 207 slide in the corresponding sliding slot holes two.

[0024] Reference Figure 1 , Figure 3 and Figure 4 The tops of the multiple sliding tables 207 are fixedly connected with mounting frames 208, and the multiple mounting frames 208 are provided with mounting holes 1 and 2. The multiple mounting holes 1 are fixedly connected with blocks 210, and the multiple mounting holes 2 are fixedly connected with electric push rods 209. The driving ends of the multiple electric push rods 209 are fixedly connected with pressing plates 211.

[0025] Reference Figure 1 , Figure 2 and Figure 3 The outer wall of the rotating table 201 is fixedly connected with a gear ring 202, and the bottom inner wall of the mounting body 1 is fixedly connected with a hydraulic rod 203, and the driving end of the hydraulic rod 203 is fixedly connected with a gear rod 204, and the gear rod 204 and the gear ring 202 are meshed with each other.

[0026] Reference Figure 1 , Figure 2 and Figure 5 A connecting chamber 212 is fixedly connected to the bottom of the workbench 4, and a plurality of circular holes four corresponding to each other are evenly spaced on the workbench 4 and the connecting chamber 212, a plurality of circular holes four are fixedly connected to piston cylinder members 213, a plurality of piston cylinder members 213 are slidably connected to the inner walls of the plurality of piston cylinder members 213, a plurality of piston plates 214 are fixedly connected to the tops of the plurality of piston plates 214, and a plurality of universal ball members 216 are fixedly connected to the tops of the plurality of support rods 215.

[0027] Reference Figure 1 , Figure 2 and Figure 5 The top of the fixed plate frame 5 is fixedly connected to an air pump 217 , and the output end of the air pump 217 is fixedly connected to a connecting pipe 218 , and one end of the connecting pipe 218 away from the air pump 217 is fixedly connected to the connecting chamber 212 .

[0028] In a specific application scenario, before the turning process begins, the air pump 217 is started to send air into the communication chamber 212 through the connecting pipe 218, forcing the piston plate 214 to slide in the piston cylinder 213, pushing the support rod 215 and the universal ball member 216 to rise, placing the hard disk substrate on the universal ball member 216, and then starting the hydraulic rod 203 to push and pull the gear rod 204, and the rotating table 201 is rotated by meshing the gear ring 202, forcing the special-shaped connecting rod 206 to rotate outside the fixed shaft 205, pulling the sliding table 2 07 and the mounting frame 208 move toward the center, and the substrate is made to slide on the universal ball component 216 through the stop block 210 until the substrate reaches the center position to complete the positioning, which can prevent the friction between the suction cup and the substrate from causing inconvenience in direct positioning, and facilitate subsequent processing. At the same time, the electric push rod 209 is started to push the pressing piece 211 to press the substrate downward, which can eliminate the gap between the substrate and the suction cup component 303, make the substrate and the suction cup component 303 fit more closely, and prevent the adsorption effect from being affected and causing the substrate to shift.

[0029] Reference Figure 1 , Figure 6 and Figure 7 A negative pressure pump 302 is fixedly connected to the bottom of the gas chamber 301, and a mounting platform 306 is fixedly connected to the top of the fixed plate frame 5. A plurality of mounting grooves are equidistantly provided on the circumference of the mounting platform 306, and mounting cylinders 311 are fixedly connected to the plurality of mounting grooves.

[0030] Reference Figure 1 , Figure 6 and Figure 7 The inner walls of the multiple mounting cylinders 311 are slidably connected with sliding members 312, and springs 313 are arranged in the multiple mounting cylinders 311. One end of the multiple springs 313 is fixedly connected to the inner wall of the corresponding mounting cylinder 311, and the other end is fixedly connected to the corresponding sliding member 312.

[0031] Reference Figure 1 , Figure 6 and Figure 7A second annular groove is provided on the mounting platform 306, and a winding wheel 305 is movably connected in the second annular groove, and a motor 307 is fixedly connected to the top of the mounting platform 306, and a rotating frame 308 is fixedly connected to the driving end of the motor 307, and the outer wall of the rotating frame 308 is fixedly connected to the inner wall of the winding wheel 305. A plurality of winding ropes 310 are wrapped around the outside of the winding wheel 305, and the ends of the plurality of winding ropes 310 away from the winding wheel 305 are fixedly connected to the corresponding sliding members 312.

[0032] Reference Figure 1 , Figure 6 and Figure 7 A plurality of fixing members 304 are fixedly connected to the bottom circumference of the air chamber 301 at equal intervals, and a plurality of sliding members 312 are fixedly connected to an arc-shaped connecting rod 314 on one side away from the winding rope 310, and a plurality of arc-shaped connecting rods 314 are provided with a circular hole five at one end away from the sliding member 312, and a thin rod is fixedly connected to the inside of the plurality of circular holes five, and a connecting plate 309 is movably connected to the outer wall of the plurality of thin rods, and a plurality of connecting plates 309 are movably connected to the corresponding fixing members 304 at one end away from the arc-shaped connecting rod 314.

[0033] In a specific application scenario, after the hard disk substrate is positioned, the rotating frame 308 is rotated by the motor 307, driving the winding wheel 305 to rotate and loosen the winding rope 310. The sliding member 312 and the arc-shaped connecting rod 314 are pushed by the elastic action of the spring 313, forcing the connecting plate 309 to push the air chamber 301 to rise. When the suction cup member 303 contacts the substrate, the negative pressure pump 302 is started to make the air chamber 301 in a negative pressure state. The substrate is fixed by the suction cup member 303, which can make the suction cup member 303 retracted into the device when not in use to prevent damage caused by collision with other objects, thereby improving applicability. At the same time, when in use, the suction cup member 303 is extended to better fit the surface of the substrate to ensure the adsorption effect.

[0034] Working principle: Before turning, start the air pump 217 to send air into the connecting chamber 212 through the connecting pipe 218, forcing the piston plate 214 to slide in the piston cylinder 213, pushing the support rod 215 and the universal ball member 216 to rise, and placing the hard disk substrate on the universal ball member 216. Then start the hydraulic rod 203 to push and pull the gear rod 204, and rotate the rotating table 201 through the engagement of the gear ring 202, forcing the special-shaped connecting rod 206 to rotate outside the fixed shaft 205, pulling the sliding table 207 and the mounting frame 208 to move toward the center, and the substrate is slid on the universal ball member 216 through the stop block 210 until the substrate reaches the center position. After positioning, the motor 307 is started to rotate the rotating frame 308, driving the winding wheel 305 to rotate and relax the winding rope 310, and the sliding part 312 and the arc-shaped connecting rod 314 are pushed by the elastic action of the spring 313, forcing the connecting plate part 309 to push the gas chamber 301 to rise. When the suction cup part 303 contacts the substrate, the universal ball part 216 is retracted, and the electric push rod 209 is started to press the substrate downward through the pressing piece 211, so that the substrate and the suction cup part 303 fit closely to prevent the gap between the two from affecting the adsorption effect and causing the substrate to shift. At the same time, the negative pressure pump 302 is started to make the gas chamber 301 in a negative pressure state, and the substrate is fixed by the suction cup part 303.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hard disk substrate turning suction cup tooling, comprising a mounting body (1), characterized in that: The inner wall of the installation body (1) is fixedly connected to a workbench (4) and a fixed plate frame (5), and a positioning operation module (2) is arranged inside the installation body (1), and the fixed plate frame (5) and the workbench (4) are provided with the same suction cup module (3); The positioning operation module (2) comprises a rotating table (201), and an annular groove (1) is provided on the inner wall of the bottom of the mounting body (1), the rotating table (201) is movably connected to the annular groove (1), a plurality of circular holes (1) are equidistantly provided on the circumference of the rotating table (201), a fixed shaft (205) is fixedly connected to each of the plurality of circular holes (1), and a special-shaped connecting rod (206) is movably connected to each of the outer walls of the plurality of fixed shafts (205); The suction cup module (3) comprises an air bin (301), and a sliding slot hole 1 is provided on the workbench (4), the air bin (301) slides in the sliding slot hole 1, a plurality of circular holes 2 are provided at equal distances on the air bin (301), and suction cup components (303) are fixedly connected to the plurality of circular holes 2.

2. The hard disk substrate turning suction cup tooling according to claim 1, characterized in that: A plurality of the special-shaped connecting rods (206) are each provided with a circular hole three, a sliding platform (207) is movably connected to each of the plurality of circular holes three, and a plurality of sliding slot holes two are equidistantly provided on the circumference of the workbench (4), and the plurality of sliding platforms (207) slide in corresponding sliding slot holes two.

3. The hard disk substrate turning suction cup tooling according to claim 2, characterized in that: The tops of the plurality of sliding platforms (207) are all fixedly connected to mounting frames (208), the plurality of mounting frames (208) are all provided with mounting holes one and two, the plurality of mounting holes one are all fixedly connected to retaining blocks (210), the plurality of mounting holes two are all fixedly connected to electric push rods (209), and the driving ends of the plurality of electric push rods (209) are all fixedly connected to pressing plates (211).

4. The hard disk substrate turning suction cup tooling according to claim 1, characterized in that: The outer wall of the rotating platform (201) is fixedly connected to a gear ring (202), and the bottom inner wall of the mounting body (1) is fixedly connected to a hydraulic rod (203), the driving end of the hydraulic rod (203) is fixedly connected to a gear rod (204), and the gear rod (204) and the gear ring (202) are meshed with each other.

5. The hard disk substrate turning suction cup tooling according to claim 1, characterized in that: The bottom of the workbench (4) is fixedly connected to a connecting chamber (212), and a plurality of circular holes (4) corresponding to each other are evenly spaced on the workbench (4) and the connecting chamber (212), a piston cylinder (213) is fixedly connected inside the plurality of circular holes (4), a piston sheet (214) is slidably connected to the inner walls of the plurality of piston cylinders (213), a support rod (215) is fixedly connected to the top of the plurality of piston sheets (214), and a universal ball member (216) is fixedly connected to the top of the plurality of support rods (215).

6. The hard disk substrate turning suction cup tooling according to claim 5, characterized in that: The top of the fixed plate frame (5) is fixedly connected to an air pump (217), and the output end of the air pump (217) is fixedly connected to a connecting pipe (218), and one end of the connecting pipe (218) away from the air pump (217) is fixedly connected to the communication chamber (212).

7. The hard disk substrate turning suction cup tooling according to claim 1, characterized in that: The bottom of the gas bin (301) is fixedly connected to a negative pressure pump (302), and the top of the fixed plate frame (5) is fixedly connected to a mounting platform (306), a plurality of mounting grooves are equidistantly formed on the circumference of the mounting platform (306), and mounting cylinders (311) are fixedly connected to each of the plurality of mounting grooves.

8. The hard disk substrate turning suction cup tooling according to claim 7, characterized in that: The inner walls of the plurality of mounting cylinders (311) are slidably connected to sliding members (312), and springs (313) are disposed in the plurality of mounting cylinders (311); one end of the plurality of springs (313) is fixedly connected to the inner wall of the corresponding mounting cylinder (311), and the other end is fixedly connected to the corresponding sliding member (312).

9. The hard disk substrate turning suction cup tooling according to claim 8, characterized in that: The mounting platform (306) is provided with an annular groove II, a winding wheel (305) is movably connected in the annular groove II, and a motor (307) is fixedly connected to the top of the mounting platform (306), a driving end of the motor (307) is connected to a rotating frame (308) via a coupling, an outer wall of the rotating frame (308) is fixedly connected to an inner wall of the winding wheel (305), a plurality of winding ropes (310) are wrapped around the outside of the winding wheel (305), and ends of the plurality of winding ropes (310) away from the winding wheel (305) are fixedly connected to corresponding sliding members (312).

10. The hard disk substrate turning suction cup tooling according to claim 9, characterized in that: The bottom circumference of the gas bin (301) is fixedly connected with a plurality of fixing members (304) at equal intervals, and a plurality of sliding members (312) are fixedly connected with an arc-shaped connecting rod (314) on one side away from the winding rope (310), and a circular hole five is formed at one end of the plurality of arc-shaped connecting rods (314) away from the sliding member (312), and a thin rod is fixedly connected inside the plurality of circular holes five, and a connecting plate (309) is movably connected to the outer wall of the plurality of thin rods, and a plurality of connecting plates (309) are movably connected to the corresponding fixing members (304) at one end away from the arc-shaped connecting rod (314).

Images