Die positioning structure of multi-station quick die changing cold header

Abstract

The utility model relates to cold header technical field discloses a mould positioning structure of multi -position quick die change cold header, including mounting panel, mould, the inside of mounting panel is evenly provided with mounting hole, the mounting panel is provided with bolt through mounting hole, the top of mounting panel is evenly provided with positioning assembly, the mould sets up at the top of positioning assembly, positioning assembly includes: dismounting part, evenly sets up in the top of mounting panel, clamping part sets up at the top of dismounting part, the dismounting part includes: arc locating plate, the top of mounting panel is installed in the circumference equidistance, stand, the top of mounting plate is fixedly installed in symmetry. The utility model provides initial circumferential positioning for circular base through arc locating plate, and positioning ring limits the vertical displacement of mould, and arc clamping plate evenly clamps the outer wall of mould through electric drive, thereby positioning mould, ensuring that the mould position is accurate when cold heading.

Description

Technical Field

[0001] This utility model relates to the field of cold heading machine technology, specifically to a mold positioning structure for a multi-station quick mold changing cold heading machine. Background Technology

[0002] A cold heading machine is a mechanical device that utilizes the principle of metal plastic forming to apply pressure to a metal blank, causing it to undergo plastic deformation within a mold, thereby producing parts of the required shape and size. It is mainly used for the mass production of standard and non-standard parts such as bolts, nuts, and rivets. It features high production efficiency, stable processing accuracy, high material utilization, and low cost, and is widely used in numerous industrial fields such as automotive, aerospace, electronics, and machinery manufacturing.

[0003] Traditional positioning structures often use bolts to directly fix the mold. Due to the lack of a precise three-dimensional positioning reference, horizontal offset or vertical tilting easily occurs during mold installation. Some structures rely solely on planar contact for positioning. When the cold heading machine operates at high speed, the mold vibrates and shifts, leading to significant workpiece dimensional deviations. This error directly impacts product yield, especially in precision parts machining. Changing molds on traditional cold heading machines requires the use of wrenches and other tools to remove bolts one by one, with a single mold change typically taking over thirty minutes. For multi-station cold heading machines, frequent bolt removal and installation when switching between different mold sizes not only increases worker workload but also results in lost production capacity due to prolonged downtime. Utility Model Content

[0004] The purpose of this utility model is to provide a mold positioning structure for a multi-station quick mold changing cold heading machine, which solves the technical problems of poor positioning accuracy, low mold changing efficiency and poor anti-loosening effect of traditional cold heading machine mold positioning structures, and achieves the purpose of high-precision mold positioning, shortening mold changing time, and improving equipment stability and processing efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold positioning structure for a multi-station rapid mold change cold heading machine, comprising a mounting plate and a mold, wherein mounting holes are uniformly opened inside the mounting plate, bolts are installed on the mounting plate through the mounting holes, and positioning components are uniformly arranged on the top of the mounting plate, the mold is positioned on top of the positioning components, and the positioning components include: disassembly and assembly parts, uniformly arranged on the top of the mounting plate; and clamping parts, arranged on top of the disassembly and assembly parts.

[0006] Preferably, the disassembly and assembly components include: an arc-shaped positioning plate, which is circumferentially and equidistantly installed on the top of the mounting plate; and a column, which is symmetrically and fixedly installed on the top of the mounting plate.

[0007] Preferably, a circular base is provided between the arc-shaped positioning plates. The top of the circular base has an installation groove. Connecting plates are fixedly installed on both sides of the circular base. The connecting plates have snap-fit ​​openings inside. The connecting plates are snap-fit ​​connected to the column through the snap-fit ​​openings. The column has a second snap-fit ​​opening inside. Movable grooves are provided on both sides of the circular base. Telescopic rods are provided inside the movable grooves. The telescopic end of the telescopic rod is provided with a snap-fit ​​block. The snap-fit ​​block is snap-fit ​​connected to the column through the second snap-fit ​​opening. A spring is sleeved on the outer wall of the telescopic rod. One end of the spring is fixedly connected to the circular base.

[0008] The arc-shaped positioning plate provides an initial circumferential positioning reference for the circular base, enabling the circular base to be placed quickly and accurately in the preset position, reducing the alignment time during the installation process.

[0009] Preferably, the other end of the first spring is fixedly connected to the locking block. The top of the locking block has a groove, and a baffle is movably connected inside the groove. A protrusion is fixedly installed at the bottom of the inner wall of the locking block, and another protrusion is fixedly installed at the bottom of the baffle. A movable rod is movably arranged on one side of the first protrusion, and a movable rod is movably arranged on one side of the other protrusion. The other end of the movable rod is movably connected to the other end of the movable rod. A second spring is sleeved on the outer wall of the first and second movable rods. One end of the second spring is fixedly connected to the baffle, and the other end of the movable rod is fixedly connected to the locking block.

[0010] Spring 1 pushes the locking block tightly into the locking slot 2 of the column, forming a basic mechanical lock, while the anti-loosening structure composed of the baffle and spring 2 further reinforces this.

[0011] Preferably, the clamping component includes: a motor, fixedly installed inside the mounting groove; and a connecting outer cylinder, fixedly installed on the top of the circular base.

[0012] Preferably, sliding openings are provided on both sides of the connecting outer cylinder, and a threaded rod is provided at the output end of the motor. The other end of the threaded rod is movably connected to the top of the inner wall of the connecting outer cylinder. Sliding grooves are provided equidistantly on the top circumference of the inner wall of the connecting outer cylinder. A conical push block is threadedly connected to the outer wall of the threaded rod. A slider is fixedly installed on both sides of the conical push block. The other side of the slider movably passes through the sliding opening and is fixedly installed with a limiting ring. The limiting ring is slidably sleeved on the outer wall of the connecting outer cylinder. A guide rod is fixedly installed inside the sliding groove. A connecting vertical plate is slidably sleeved on the outer wall of the guide rod. A connecting horizontal rod is fixedly sleeved at the bottom of the connecting vertical plate. One end of the connecting horizontal rod contacts the outer wall of the conical push block, and the other end of the connecting horizontal rod movably passes through the inner wall of the connecting outer cylinder and extends to the outer wall of the connecting outer cylinder.

[0013] The sliding port on the outer cylinder, the groove on the top of the inner wall, and the guide rod work together to provide precise motion guidance for components such as the conical push block, slider, and connecting vertical plate.

[0014] Preferably, the outer wall of the guide rod is fitted with a spring three, one end of the spring three is fixedly connected to the connecting outer cylinder, and the other end of the spring three is fixedly connected to the connecting vertical plate. Protrusions two are equidistantly installed on the outer circumference of the connecting outer cylinder. Connecting rods are movably arranged on both sides of the protrusions two. A sliding port two is slidably installed inside the connecting rod. Sliding rods are fixedly installed on both sides of the other end of the connecting crossbar. The sliding rods are slidably connected to the connecting rods through the sliding port two. A connecting block is fixedly installed on the other end of the connecting rod. An arc-shaped clamping plate is fixedly installed on the other side of the connecting block. A positioning ring is fixedly installed on the top of the connecting outer cylinder.

[0015] The positioning ring connected to the top of the outer cylinder provides a precise vertical positioning reference for the mold, ensuring that the mold will not tilt or shift during installation.

[0016] This utility model provides a mold positioning structure for a multi-station quick mold changing cold heading machine. It has the following beneficial effects:

[0017] (1) This utility model provides initial circumferential positioning for the circular base through the arc-shaped positioning plate, the positioning ring restricts the vertical displacement of the mold, and the arc-shaped clamping plate clamps the outer wall of the mold evenly through electric drive, thereby positioning the mold and ensuring the accurate position of the mold during cold heading.

[0018] (2) This utility model uses the "downward pressing and locking + spring locking" mechanism of the disassembly and assembly components. Pressing down on the circular base will allow the locking block to be inserted into the locking port of the column. With the automatic flipping and anti-loosening of the baffle, the positioning and locking can be completed without additional tools. When disassembling, only pressing the baffle is needed to release the locking. The operation process is simple and efficient. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the positioning component structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the disassembly and assembly components of this utility model;

[0022] Figure 4 This is a partial structural cross-sectional view of the disassembly and assembly components of this utility model;

[0023] Figure 5 This is a cross-sectional view of the clamping component structure of this utility model.

[0024] In the diagram: 1. Mounting plate; 2. Bolt; 3. Positioning assembly; 4. Mold.

[0025] 31 Disassembly and assembly parts, 311 Arc-shaped positioning plate, 312 Column, 313 Circular base, 314 Connecting plate, 315 Telescopic rod, 316 Locking block, 317 Spring 1, 318 Baffle, 319 Protrusion 1, 3111 Movable rod 1, 3112 Movable rod 2, 3113 Spring 2;

[0026] 32 Clamping component, 321 Motor, 322 Threaded rod, 323 Connecting outer cylinder, 324 Conical push block, 325 Slider, 326 Limiting ring, 327 Guide rod, 328 Connecting vertical plate, 329 Spring 3, 3211 Connecting horizontal bar, 3212 Slide rod, 3213 Connecting rod, 3214 Protrusion 2, 3215 Connecting block, 3216 Arc-shaped clamping plate, 3217 Positioning ring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] Example 1:

[0030] Based on the problems of poor positioning accuracy, low mold changing efficiency, and poor anti-loosening effect of the existing traditional cold heading machine mold positioning structure, the present invention provides a preferred embodiment of a mold positioning structure for a multi-station rapid mold changing cold heading machine, for example... Figure 1-5The following describes a mold positioning structure for a multi-station rapid mold change cold heading machine: It includes a mounting plate 1 and a mold 4. The mounting plate 1 has evenly spaced mounting holes, through which bolts 2 are installed. Positioning components 3 are evenly arranged on the top of the mounting plate 1. The mold 4 is positioned on top of the positioning components 3. The positioning components 3 include: disassembly / assembly parts 31 evenly arranged on the top of the mounting plate 1; and clamping parts 32 positioned on top of the disassembly / assembly parts 31. The disassembly / assembly parts 31 include: arc-shaped positioning plates 311, equidistantly mounted circumferentially. The top of mounting plate 1; uprights 312, symmetrically fixedly installed on the top of mounting plate 1; a circular base 313 is provided between the arc-shaped positioning plates 311, the top of the circular base 313 has a mounting groove, and connecting plates 314 are fixedly installed on both sides of the circular base 313 respectively. The connecting plates 314 have snap-fit ​​openings inside, and the connecting plates 314 are snap-fit ​​connected to the uprights 312 through the snap-fit ​​openings. The uprights 312 have a second snap-fit ​​opening inside, and movable grooves are provided on both sides of the circular base 313. The movable grooves are provided with... The telescopic rod 315 has a locking block 316 at its telescopic end. The locking block 316 is engaged with the column 312 through a locking port. A spring 317 is sleeved on the outer wall of the telescopic rod 315. One end of the spring 317 is fixedly connected to the circular base 313, and the other end is fixedly connected to the locking block 316. A groove is formed on the top of the locking block 316, and a baffle 318 is movably connected inside the groove. A protrusion 319 is fixedly installed on the bottom of the inner wall of the locking block 316. Another protrusion 319 is fixedly installed at the bottom. A movable rod 3112 is movably arranged on one side of the protrusion 319, and a movable rod 3111 is movably arranged on one side of the other protrusion 319. The other end of the movable rod 3111 is movably connected to the other end of the movable rod 3112. A spring 3113 is sleeved on the outer wall of the movable rod 3111 and the movable rod 3112. One end of the spring 3113 is fixedly connected to the baffle 318, and the other end of the movable rod 3111 is fixedly connected to the locking block 316.

[0031] Furthermore, in this embodiment, by pressing down on the circular base 313, the connecting plate 314 slides down along the column 312 and pushes the locking block 316 outward, so that the locking block 316 is inserted into the second locking slot. At the same time, the telescopic rod 315 and the first spring 317 extend to lock the circular base 313 and the column 312. The baffle 318 in the groove at the top of the locking block 316 is connected to the first protrusion 319 through the first movable rod 3111 and the second movable rod 3112. The second spring 3113 is sleeved on the outside of the movable rod. After the locking block 316 is inserted into the second locking slot, the baffle 318 flips under the action of the second spring 3113 to cover the top of the second locking slot and prevent the locking block 316 from popping out due to vibration.

[0032] Example 2:

[0033] Based on Embodiment 1, a preferred embodiment of the mold positioning structure of a multi-station rapid mold change cold heading machine provided by this utility model is, for example... Figure 1-5 As shown: The clamping component 32 includes: a motor 321, fixedly installed inside the mounting groove; a connecting outer cylinder 323, fixedly installed on the top of the circular base 313; sliding openings are respectively opened on both sides of the connecting outer cylinder 323; a threaded rod 322 is provided at the output end of the motor 321; the other end of the threaded rod 322 is movably connected to the top of the inner wall of the connecting outer cylinder 323; sliding grooves are equidistantly opened on the circumference of the top of the inner wall of the connecting outer cylinder 323; a conical push block 324 is threadedly connected to the outer wall of the threaded rod 322; sliders 325 are fixedly installed on both sides of the conical push block 324; the other side of the slider 325 movably passes through the sliding opening and is fixedly installed with a limiting ring 326; the limiting ring 326 is slidably sleeved on the outer wall of the connecting outer cylinder 323; a guide rod 327 is fixedly installed inside the sliding groove; a connecting vertical plate 328 is slidably sleeved on the outer wall of the guide rod 327; a connecting horizontal rod 3211 is fixedly sleeved at the bottom of the connecting vertical plate 328; one side of the connecting horizontal rod 3211... The end of the connecting rod 3211 contacts the outer wall of the tapered pusher 324. The other end of the connecting crossbar 3211 movably passes through the inner wall of the connecting outer cylinder 323 and extends to the outer wall of the connecting outer cylinder 323. A spring 329 is sleeved on the outer wall of the guide rod 327. One end of the spring 329 is fixedly connected to the connecting outer cylinder 323, and the other end of the spring 329 is fixedly connected to the connecting vertical plate 328. Protrusions 3214 are equidistantly installed on the circumference of the outer wall of the connecting outer cylinder 323. The two sides of the protrusions 3214 are... The connecting rod 3213 is provided with a sliding port 2 inside the connecting rod 3213. The other end of the connecting crossbar 3211 is fixedly installed with slide rods 3212 on both sides. The slide rods 3212 are slidably connected to the connecting rod 3213 through the sliding port 2. The other end of the connecting rod 3213 is fixedly installed with a connecting block 3215. The other side of the connecting block 3215 is fixedly installed with an arc-shaped clamping plate 3216. The top of the connecting outer cylinder 323 is fixedly equipped with a positioning ring 3217.

[0034] Furthermore, in this embodiment, after the motor 321 is started, the output threaded rod 322 rotates, causing the threaded conical push block 324 to move upward along the threaded rod 322. The sliders 325 on both sides of the conical push block 324 slide within the sliding opening of the connecting outer cylinder 323. At the same time, the sliders 325 drive the limiting ring 326 to move upward along the outer wall of the connecting outer cylinder 323, ensuring the stable movement of the conical push block 324. When the conical push block 324 moves upward, its outer wall pushes the connecting crossbar 3211 to move outward, connecting... The horizontal bar 3211 drives the connecting vertical plate 328 to slide on the guide rod 327, the spring 329 is stretched, the connecting vertical plate 328 transmits the thrust to the connecting rod 3213 through the connecting horizontal bar 3211, the slide bar 3212 at the end of the connecting horizontal bar 3211 slides in the sliding port 2 of the connecting rod 3213, pushing the connecting rod 3213 to unfold outward, the connecting rod 3213 drives the connecting block 3215 and the arc-shaped clamping plate 3216 to move outward until the arc-shaped clamping plate 3216 is in close contact with the outer wall of the mold 4.

[0035] In use, the positioning structure is fixed to the cold heading machine by the mounting plate 1 and bolts 2. The positioning component 3 is used to achieve quick assembly and disassembly and precise clamping of the mold 4. The positioning component 3 is divided into an assembly / disassembly component 31 and a clamping component 32. The two work together to complete the positioning and fixing of the mold. The arc-shaped positioning plate 311 surrounds the top of the mounting plate 1 to provide initial positioning for the circular base 313. The column 312 is symmetrically fixed on the mounting plate 1. The connecting plate 314 is initially engaged with the column 312 through the snap-fit ​​joint, so that the circular base 313 is in the state to be fixed. The telescopic rod 315 is covered by a spring 317. Initially, the spring 317 is in the natural state, and the snap-fit ​​block 316 is not fully inserted into the snap-fit ​​joint of the column 312. During installation, the circular base 313 is pressed down, and the connecting plate 314... 4. Slide down along the column 312 and push the locking block 316 outward, so that the locking block 316 inserts into the second locking slot. At the same time, the telescopic rod 315 and the first spring 317 extend, locking the circular base 313 and the column 312. The baffle 318 in the groove at the top of the locking block 316 is connected to the first protrusion 319 through the first movable rod 3111 and the second movable rod 3112. The second spring 3113 is sleeved on the outside of the movable rod. After the locking block 316 is inserted into the second locking slot, the baffle 318 flips under the action of the second spring 3113, covering the top of the second locking slot, preventing the locking block 316 from popping out due to vibration, thus playing an anti-loosening role. When disassembly is required, press down on the baffle 318, and the baffle 318 will drive the first movable rod 3111 and the second movable rod 3112 to fold. Simultaneously, spring 3113 is compressed. After there is no obstruction, spring 317 rebounds, causing the locking block 316 to disengage from locking port 2, thus facilitating disassembly. The mold 4 is placed inside the positioning ring 3217, and the motor 321 is started. After the motor 321 starts, the output threaded rod 322 rotates, causing the threaded conical push block 324 to move upward along the threaded rod 322. The sliders 325 on both sides of the conical push block 324 slide within the sliding opening of the connecting outer cylinder 323. At the same time, the sliders 325 drive the limiting ring 326 to move upward along the outer wall of the connecting outer cylinder 323, ensuring the stable movement of the conical push block 324. When the conical push block 324 moves upward, its outer wall pushes the connecting crossbar 3211 to move outward. The connecting crossbar 3211 drives the connecting vertical plate. 328 slides on guide rod 327, spring 329 stretches, connecting vertical plate 328 transmits thrust to connecting rod 3213 through connecting horizontal bar 3211, slides slide rod 3212 at the end of connecting horizontal bar 3211 in sliding port 2 of connecting rod 3213, pushing connecting rod 3213 outward, connecting rod 3213 drives connecting block 3215 and arc-shaped clamping plate 3216 to move outward until arc-shaped clamping plate 3216 is in close contact with the outer wall of mold 4, achieving precise clamping of mold. Motor 321 reverses, conical push block 324 moves down, spring 329 resets and pushes connecting vertical plate 328 inward, driving connecting horizontal bar 3211 and arc-shaped clamping plate 3216 to retract, releasing clamping of mold, thus facilitating replacement of mold 4.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mold positioning structure for a multi-station quick mold change cold heading machine, comprising a mounting plate (1) and a mold (4), characterized in that: The mounting plate (1) has uniformly spaced mounting holes inside, and bolts (2) are installed on the mounting plate (1) through the mounting holes. Positioning components (3) are uniformly arranged on the top of the mounting plate (1), and the mold (4) is positioned on top of the positioning components (3). The positioning components (3) include: The disassembly and assembly components (31) are evenly arranged on the top of the mounting plate (1); The clamping component (32) is located on top of the disassembly component (31).

2. The mold positioning structure of a multi-station rapid mold changing cold heading machine according to claim 1, characterized in that: The disassembly / assembly component (31) includes: Arc-shaped positioning plate (311), the top of the mounting plate (1) is installed at equal intervals around the circumference; The columns (312) are symmetrically fixed on the top of the mounting plate (1).

3. The mold positioning structure of a multi-station rapid mold change cold heading machine according to claim 2, characterized in that: A circular base (313) is provided between the arc-shaped positioning plates (311). The top of the circular base (313) is provided with an installation groove. Connecting plates (314) are fixedly installed on both sides of the circular base (313). The connecting plates (314) are provided with a snap-fit ​​opening inside. The connecting plates (314) are snap-fit ​​connected to the column (312) through the snap-fit ​​opening. The column (312) is provided with a second snap-fit ​​opening inside. Movable grooves are provided on both sides of the circular base (313). A telescopic rod (315) is provided inside the movable groove. A snap-fit ​​block (316) is provided at the telescopic end of the telescopic rod (315). The snap-fit ​​block (316) is snap-fit ​​connected to the column (312) through the second snap-fit ​​opening. A spring (317) is sleeved on the outer wall of the telescopic rod (315). One end of the spring (317) is fixedly connected to the circular base (313).

4. The mold positioning structure of a multi-station rapid mold change cold heading machine according to claim 3, characterized in that: The other end of the spring (317) is fixedly connected to the locking block (316). The top of the locking block (316) has a groove, and a baffle (318) is movably connected inside the groove. A protrusion (319) is fixedly installed on the bottom of the inner wall of the locking block (316), and another protrusion (319) is fixedly installed on the bottom of the baffle (318). A movable rod (3112) is movably arranged on one side of the protrusion (319). A movable rod (3111) is movably provided on one side of block 1 (319). The other end of the movable rod (3111) is movably connected to the other end of the movable rod (3112). A spring (3113) is sleeved on the outer wall of the movable rod (3111) and the movable rod (3112). One end of the spring (3113) is fixedly connected to the baffle (318), and the other end of the movable rod (3111) is fixedly connected to the locking block (316).

5. The mold positioning structure of a multi-station rapid mold changing cold heading machine according to claim 1, characterized in that: The clamping component (32) includes: The motor (321) is fixedly installed inside the mounting slot; The outer cylinder (323) is connected and fixedly installed on the top of the circular base (313).

6. The mold positioning structure of a multi-station rapid mold change cold heading machine according to claim 5, characterized in that: The connecting outer cylinder (323) has sliding openings on both sides. The output end of the motor (321) is provided with a threaded rod (322). The other end of the threaded rod (322) is movably connected to the top of the inner wall of the connecting outer cylinder (323). The top circumference of the inner wall of the connecting outer cylinder (323) is provided with sliding grooves at equal intervals. The outer wall of the threaded rod (322) is threadedly connected with a conical push block (324). The two sides of the conical push block (324) are respectively fixedly installed with sliders (325). The other side of the slider (325) movably passes through the sliding opening and is fixedly installed with a limit circle. The limiting ring (326) is slidably sleeved on the outer wall of the connecting outer cylinder (323). A guide rod (327) is fixedly installed inside the sliding groove. A connecting vertical plate (328) is slidably sleeved on the outer wall of the guide rod (327). A connecting horizontal rod (3211) is fixedly sleeved on the bottom of the connecting vertical plate (328). One end of the connecting horizontal rod (3211) is in contact with the outer wall of the conical push block (324). The other end of the connecting horizontal rod (3211) movably penetrates the inner wall of the connecting outer cylinder (323) and extends to the outer wall of the connecting outer cylinder (323).

7. The mold positioning structure of a multi-station rapid mold change cold heading machine according to claim 6, characterized in that: The guide rod (327) is fitted with a spring three (329) on its outer wall. One end of the spring three (329) is fixedly connected to the connecting outer cylinder (323), and the other end of the spring three (329) is fixedly connected to the connecting vertical plate (328). The connecting outer cylinder (323) is equidistantly fitted with protrusions two (3214) on its outer circumference. Connecting rods (3213) are movably arranged on both sides of the protrusions two (3214). The connecting rods (3213) slide inside. Secondly, two sliding rods (3212) are fixedly installed on both sides of the other end of the connecting crossbar (3211). The sliding rods (3212) are slidably connected to the connecting rod (3213) through the sliding port. A connecting block (3215) is fixedly installed on the other end of the connecting rod (3213). An arc-shaped clamping plate (3216) is fixedly installed on the other side of the connecting block (3215). A positioning ring (3217) is fixedly installed on the top of the connecting outer cylinder (323).

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