Double-barrelled separate control type hot melt glue machine

Abstract

The utility model discloses a double bucket separate control formula hot melt glue machine, including operation platform, double bucket hot adhesion mechanism, bucket body clamping mechanism and stabilizing mechanism, double bucket hot adhesion mechanism includes constant temperature bucket and horizontal moving frame, the bucket body clamping mechanism includes the clamping pipe and the clamping rod, stabilizing mechanism includes the screw ring and the elastic top pin, through double bucket independent configuration and horizontal moving hot adhesion structure, has realized the alternate or synchronous heating and coating operation of hot melt glue, and hot adhesion board can be driven under the driving of hydraulic cylinder and immerse in constant temperature bucket accurately, and is equipped with adjustable horizontal moving frame and support plate, make hot adhesion operation more flexible, accurate, adopt the linkage design of rotary ring, inlaying rotation board, link rod, and operator only needs to pull rod to drive clamping assembly to complete the quick loading and unloading of bucket body, and the replacement process and artificial operation burden are simplified greatly.

Description

Technical Field

[0001] This utility model relates to the field of hot melt glue machine technology, and more specifically, it relates to a dual-barrel separately controlled hot melt glue machine. Background Technology

[0002] In existing technologies, traditional hot melt adhesive equipment mostly adopts a single-tank design, which can meet the basic hot melt adhesive heating and conveying needs to a certain extent, but still has many shortcomings.

[0003] Most existing dual-barrel hot melt glue machines adopt a simple switching structure, that is, the two barrels are used alternately through valves or switching mechanisms. Although it is called "dual-barrel", in reality, most of them can only achieve a single barrel working state, while the other barrel can only be in a standby or preheating state. It is impossible for the two barrels to independently and simultaneously perform heating, melting and conveying operations. This limitation of the structure affects the work efficiency, especially in industrial scenarios with high demand for hot melt glue or continuous operation. It cannot meet the high-intensity and uninterrupted use requirements and is prone to creating production bottlenecks.

[0004] In existing equipment, the barrel is typically fixed using traditional structures such as bolt connections or rigid welding. This method is cumbersome and time-consuming when replacing, maintaining, or cleaning the barrel, requiring tools and even specialized technicians for disassembly and assembly, severely impacting equipment maintenance efficiency. Especially after prolonged use, residual adhesive inside the barrel can easily lead to carbon buildup or charring, necessitating regular cleaning. However, traditional structures are difficult to disassemble, increasing maintenance costs and posing safety hazards, such as the risk of burns from disassembly and assembly before sufficient cooling. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the problems existing in the prior art, this utility model provides a dual-barrel separately controlled hot melt glue machine to solve the technical problems mentioned in the background art, such as the lack of multiple barrel areas working at the same time and the difficulty in quickly installing and disassembling the barrels.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a dual-barrel separately controlled hot melt glue machine, comprising an operating table, a dual-barrel hot bonding mechanism, a barrel clamping mechanism, and a stabilizing mechanism. The dual-barrel hot bonding mechanism includes a constant temperature barrel and a transverse frame. An installation platform is installed at the top of the operating table, and the constant temperature barrels are symmetrically installed on the installation platform. A side fixing plate and a hydraulic cylinder are installed on the transverse frame. A hot bonding plate is installed at one end of the hydraulic cylinder, and a support plate is installed at the bottom end of the side fixing plate. The hot bonding plate can be immersed in the constant temperature barrel, and the hot bonding plate and the support plate are arranged opposite to each other. The barrel clamping mechanism includes a clamping tube and a clamping rod. A rotating ring is rotatably installed on the outer wall of the clamping tube, and a pulling rod is installed on the rotating ring. A rotating plate is rotatably installed on the side wall of the clamping tube, and a connecting rod is rotatably installed between the rotating plate and the pulling rod. A top-loaded ring is installed at the bottom end of the rotating ring. The pulling of the connecting rod causes the rotating plate to rotate and embed into or move away from the clamping rod.

[0009] The present invention is further configured such that the stabilizing mechanism includes a threaded ring and a spring-loaded pin. The threaded ring is threadedly connected to the outer wall of the clamping tube. A directional ring is slidably installed on the outer wall of the clamping tube. A thrust bearing is installed between the directional ring and the threaded tube. Multiple sets of spring-loaded pins are installed on the directional ring. A spring-loaded groove is opened at the bottom end of the receiving ring. In the initial state, the spring-loaded pins push against the spring-loaded groove step by step, so that the receiving ring and the rotating ring rotate stably. The directional ring moves further, so that the spring-loaded pins are stably embedded in the spring-loaded groove, and the rotating ring is fixed on the clamping tube.

[0010] The present invention is further configured such that the constant temperature barrel is provided with a mounting bracket, a side plate is installed on the side of the mounting bracket, and the clamping pipe is installed on the side plate. The mounting bracket provides a firm support for the constant temperature barrel and ensures the overall stability of the equipment.

[0011] The present invention is further provided that a side frame is installed on the top side of the operating table, and a transverse sliding component is installed on the side frame. The side frame provides additional support for the operating table and improves the overall stability.

[0012] The present invention is further configured such that the transverse frame is mounted on the transverse assembly, and the transverse assembly is provided with two sets of transverse frames. The transverse frame can provide lateral movement of the hot-melt plate, making it convenient for the operator to adjust the position of the hot-melt plate, ensuring uniform coating of hot melt adhesive, and improving work efficiency.

[0013] The present invention is further provided that a connecting plate is installed at the bottom end of the side wall of the clamping pipe, and the connecting plate is fixedly installed on the side plate. By fixing the connecting plate, the stability of the equipment can be enhanced, the position of the clamping pipe can be prevented from being unstable, and mechanical failures and operational inconveniences can be reduced.

[0014] The present invention is further configured such that one end of the snap-fit ​​rod can pass through the mounting platform, and further through the side plate to engage with the snap-fit ​​tube. The snap-fit ​​tube and the snap-fit ​​rod provide a stable connection and support, ensuring that the components of the hot melt glue machine will not loosen or shift during operation, thereby improving the stability and durability of the equipment.

[0015] The present invention is further configured such that a limiting block is installed at one end of the locking rod, and one end face of the limiting block contacts and supports the bottom of the mounting platform. The limiting block is designed to contact and support the bottom of the mounting platform to ensure the stability of the equipment and prevent the components from loosening due to external forces.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a dual-barrel, separately controlled hot melt adhesive machine, which has the following advantages:

[0018] This invention features a dual-barrel hot-bonding mechanism. Through the independent configuration of the two barrels and the transverse hot-bonding structure, it enables alternating or synchronous heating and coating of hot melt adhesive. The hot-bonding plate can be precisely immersed into the constant-temperature barrel under the drive of a hydraulic cylinder. It is also equipped with an adjustable transverse frame and support plate, making the hot-bonding operation more flexible and precise. The dual-barrel layout not only improves work efficiency but also avoids downtime caused by single-barrel operation, thereby improving the overall continuity of operation and productivity.

[0019] This utility model features a barrel clamping mechanism, employing a linkage design of a rotating ring, a locking plate, and a connecting rod. The operator can quickly load and unload the barrel by simply pulling the rod to drive the clamping assembly, significantly simplifying the replacement process and reducing manual operation burden. At the same time, the fixed cooperation between the connecting plate and the clamping pipe enhances structural stability, effectively preventing problems such as barrel loosening or displacement during equipment operation, further reducing maintenance frequency and failure rate.

[0020] This invention incorporates a stabilizing mechanism. Through a combination of a threaded ring, a directional ring, a thrust bearing, and multiple sets of spring-loaded pins, the stabilizing mechanism enables the rotating ring to achieve controllable rotation and precise locking during assembly or operation. The step-by-step positioning structure of the spring-loaded pins and the spring-loaded grooves ensures initial positioning before complete fixation. As the directional ring slides further, the spring-loaded pins are fully embedded in the grooves, achieving a highly stable fixation effect. This not only enhances the reliability of the locking mechanism but also significantly improves the safety and structural anti-disturbance capability of the entire machine during operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the device in the unused state of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of part of the double-barrel thermal bonding mechanism in this utility model;

[0023] Figure 3 This is a schematic diagram of the constant temperature installation method in this utility model;

[0024] Figure 4 This is a schematic diagram of the barrel clamping mechanism and stabilizing mechanism in this utility model;

[0025] Figure 5 This is a schematic diagram of the internal structure of the barrel clamping mechanism and the stabilizing mechanism in this utility model.

[0026] In the diagram: 1. Operating table; 2. Thermostatic tank; 3. Horizontal movement frame; 4. Mounting platform; 5. Side fixing plate; 6. Hydraulic cylinder; 7. Heat-bonding plate; 8. Support plate; 9. Clip-on pipe; 10. Clip-on rod; 11. Rotating ring; 12. Pull rod; 13. Embedded rotating plate; 14. Connecting rod; 15. Top ring; 16. Threaded ring; 17. Spring-loaded pin; 18. Orienting ring; 19. Thrust bearing; 20. Spring-loaded groove; 21. Side plate; 22. Side frame; 23. Horizontal movement assembly; 24. Connecting plate; 25. Limiting block; 301. Mounting frame. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0030] Please see Figures 1-5A dual-barrel, separately controlled hot melt adhesive machine includes an operating table 1, a dual-barrel hot-bonding mechanism, a barrel clamping mechanism, and a stabilizing mechanism. The dual-barrel hot-bonding mechanism includes a constant-temperature barrel 2 and a transverse frame 3. An mounting platform 4 is installed on the top of the operating table 1, and the constant-temperature barrels 2 are symmetrically mounted on the mounting platform 4. Side fixing plates 5 and hydraulic cylinders 6 are installed on the transverse frame 3. A hot-bonding plate 7 is installed at one end of the hydraulic cylinder 6, and a support plate 8 is installed at the bottom of the side fixing plate 5. The hot-bonding plate 7 can be immersed in the constant-temperature barrel 2. The support plates 8 are arranged opposite each other. The barrel locking mechanism includes a locking tube 9 and a locking rod 10. A rotating ring 11 is rotatably installed on the outer wall of the locking tube 9. A pulling rod 12 is installed on the rotating ring 11. A rotating plate 13 is rotatably installed on the side wall of the locking tube 9. A connecting rod 14 is rotatably installed between the rotating plate 13 and the pulling rod 12. A top ring 15 is installed at the bottom end of the rotating ring 11. The pulling of the connecting rod 14 causes the rotating plate 13 to rotate and embed into or move away from the locking rod 10.

[0031] In this embodiment, the dual-barrel hot-bonding mechanism consists of a symmetrically arranged thermostatic barrel 2 and a transverse frame 3. The thermostatic barrel 2 is mounted on the mounting platform 4 at the top of the operating table 1, responsible for heating and maintaining the temperature of the hot melt adhesive. During operation, the hot-bonding plate 7 can move and adjust along the transverse frame 3 under the drive of the hydraulic cylinder 6, adsorbing or adhering the molten adhesive onto the hot-bonding plate 7 for subsequent hot-bonding operations. The hot-bonding plate 7 is arranged opposite to the support plate 8 below, serving as a positioning and contact aid. Through the transverse structure and the symmetrically arranged dual-barrel design, while one barrel is being operated, the other barrel can be heated, preheated, or the adhesive replaced, ensuring continuous operation and thermal efficiency. The snap-fit ​​mechanism is used to conveniently and securely install the hot melt glue bucket onto the device, enabling quick replacement and a sealed connection. During operation, the hot melt glue bucket passes through the mounting platform 4 and the side plate 21 via the snap-fit ​​rod 10 and is inserted into the snap-fit ​​tube 9. Subsequently, the operator rotates or pulls the rotating ring 11, which drives the insert plate 13 to rotate via the connecting rod 14, embedding it into the groove of the snap-fit ​​rod 10 to complete the snap-fit ​​fixation. When pulled in the opposite direction, the insert plate 13 disengages from the snap-fit ​​rod 10, and the hot melt glue bucket can be removed, achieving quick disassembly and assembly. The entire snap-fit ​​action is completed by external rotation and pulling operations, simplifying manual intervention and improving replacement efficiency.

[0032] The stabilizing mechanism includes a threaded ring 16 and a spring-loaded pin 17. The threaded ring 16 is threaded onto the outer wall of the retaining tube 9. A directional ring 18 is slidably mounted on the outer wall of the retaining tube 9. A thrust bearing 19 is installed between the directional ring 18 and the threaded tube. Multiple sets of spring-loaded pins 17 are mounted on the directional ring 18. A spring-loaded groove 20 is opened at the bottom end of the receiving ring 15. In the initial state, the spring-loaded pins 17 push against the spring-loaded groove 20 step by step, so that the receiving ring 15 and the rotating ring 11 rotate stably. The directional ring 18 moves further, so that the spring-loaded pins 17 are stably embedded in the spring-loaded groove 20, and the rotating ring 11 is fixed on the retaining tube 9.

[0033] In this embodiment, to ensure that the snap-fit ​​mechanism does not loosen or shift under high temperature and high pressure, during the operation of the stable mechanism, the threaded ring 16 is screwed into the outer wall of the snap-fit ​​tube 9 to form a preliminary fastening. The directional ring 18 slides along its axial direction. After sliding to the preset position, multiple sets of spring-loaded pins 17 on the directional ring 18 will push into the spring-loaded groove 20 at the bottom of the receiving ring 15 in stages, generating axial damping force and limiting effect, so that the entire rotating ring 11 is stably positioned on the snap-fit ​​tube 9 to prevent rotation or displacement. If the directional ring 18 is pushed further, the spring-loaded pins 17 are completely embedded in the spring-loaded groove 20, and the rotating ring 11 is firmly locked in one place, improving the reliability and safety of the snap-fit ​​mechanism.

[0034] Please see Figures 1-5 As a supplementary embodiment of a dual-barrel separately controlled hot melt glue machine with a dual-barrel hot bonding mechanism, a barrel snap-fit ​​mechanism, and a stabilizing mechanism: A mounting frame 301 is installed on the constant temperature barrel 2. A side plate 21 is installed on the side of the mounting frame 301, and a snap-fit ​​tube 9 is installed on the side plate 21. A side frame 22 is installed on the top side of the operating table 1, and a transverse moving assembly 23 is installed on the side frame 22. A transverse moving frame 3 is installed on the transverse moving assembly 23, and two sets are provided on the transverse moving assembly 23. A connecting plate 24 is installed at the bottom end of the side wall of the snap-fit ​​tube 9, and the connecting plate 24 is fixedly installed on the side plate 21. One end of the snap-fit ​​rod 10 can pass through the mounting table 4 and further through the side plate 21 to engage with the snap-fit ​​tube 9. A limiting block 25 is installed at one end of the snap-fit ​​rod 10, and one end face of the limiting block 25 contacts and supports the bottom end of the mounting table 4.

[0035] More specifically, the hot melt adhesive bucket is installed on the side plate 21, and the locking rod 10 is inserted into the locking tube 9. The operator pulls the rotating ring 11 to make the insert plate 13 lock the locking rod 10, completing the quick installation of the bucket. The directional ring 18 is pushed to make the spring top pin 17 stably embedded in the spring top groove 20, realizing rotation locking and ensuring stability. The constant temperature bucket 2 starts to heat the hot melt adhesive to the required viscosity. The horizontal moving frame 3 is in the initial position, and the hot adhesive plate 7 is suspended above the bucket. The hydraulic cylinder 6 drives the hot adhesive plate 7 to descend and immerse it in the current bucket to absorb the adhesive. After the hot adhesive plate 7 is lifted, the hot adhesive operation can be performed. If a bucket is used up or the temperature is insufficient, another set of horizontal moving frames 3 is moved laterally to the position of another bucket under the action of the horizontal moving component 23, and the adsorption process is repeated. When the adhesive in a bucket is exhausted or needs to be replaced, the operator pulls the rotating ring 11 in the opposite direction to make the insert plate 13 disengage from the locking rod 10, pulls out the hot melt adhesive bucket, replaces the new bucket, and locks it again to stabilize it, so that the operation can be resumed.

[0036] In summary, when the overall equipment is in use or operation: When the double-barrel hot-bonding mechanism is required, it consists of a symmetrically arranged constant-temperature barrel 2 and a transverse frame 3. The constant-temperature barrel 2 is installed on the mounting platform 4 on top of the operating table 1 and is responsible for heating and keeping the hot melt adhesive warm. During operation, the hot-bonding plate 7 can move and adjust along the transverse frame 3 under the drive of the hydraulic cylinder 6, adsorbing or adhering the molten adhesive onto the hot-bonding plate 7 for subsequent hot-bonding operations. The hot-bonding plate 7 is arranged opposite to the support plate 8 below, playing a role in positioning and contact assistance. Through the transverse structure and the symmetrical arrangement of the double barrels, the other barrel can be heated or the adhesive replaced while one barrel is being operated, ensuring the continuity of operation and thermal efficiency.

[0037] When the barrel clamping mechanism is in operation, it is used to conveniently and securely install the hot melt glue barrel onto the device, enabling quick replacement and sealing connection. During operation, the hot melt glue barrel passes through the mounting platform 4 and the side plate 21 via the clamping rod 10 and is inserted into the clamping tube 9. Subsequently, the operator rotates or pulls the rotating ring 11, which drives the insert plate 13 to rotate via the connecting rod 14, embedding it into the groove of the clamping rod 10 to complete the clamping fixation. When pulled in the opposite direction, the insert plate 13 disengages from the clamping rod 10, and the hot melt glue barrel can be removed, achieving quick disassembly and assembly. The entire clamping action is completed by external rotation and pulling operations, simplifying manual intervention and improving replacement efficiency.

[0038] When the stabilizing mechanism is in operation, in order to ensure that the locking mechanism does not loosen or shift under high temperature and high pressure, during the operation of the stabilizing mechanism, the threaded ring 16 is screwed into the outer wall of the locking tube 9 to form a preliminary fastening, and the directional ring 18 slides along its axis. After sliding to the preset position, multiple sets of spring-loaded pins 17 on the directional ring 18 will push into the spring-loaded groove 20 at the bottom of the receiving ring 15 in stages, generating axial damping force and limiting effect, so that the entire rotating ring 11 is stably positioned on the locking tube 9 to prevent rotation or displacement. If the directional ring 18 is pushed further, the spring-loaded pins 17 are fully embedded in the spring-loaded groove 20, and the rotating ring 11 is firmly locked in one place, improving the reliability and safety of the locking mechanism.

[0039] Install the hot melt adhesive bucket onto the side plate 21 and insert the snap-fit ​​tube 9 through the snap-fit ​​rod 10. The operator pulls the rotating ring 11 to make the insert plate 13 snap into the snap-fit ​​rod 10, completing the quick installation of the bucket. Push the directional ring 18 to make the spring top pin 17 stably embedded in the spring top groove 20 to achieve rotation locking and ensure stability. The constant temperature bucket 2 starts heating the hot melt adhesive to the required viscosity. The horizontal movement frame 3 is in the initial position, and the hot adhesive plate 7 is suspended above the bucket. The hydraulic cylinder 6 drives the hot adhesive plate 7 to descend and immerse it in the current bucket to absorb the adhesive. After the hot adhesive plate 7 is lifted, the hot adhesive operation can be performed. If one bucket is used up or the temperature is insufficient, another set of horizontal movement frames 3 moves laterally to the position of another bucket under the drive of the horizontal movement component 23 and repeats the adsorption process. When the adhesive in a bucket is exhausted or needs to be replaced, the operator pulls the rotating ring 11 in the opposite direction to make the insert plate 13 disengage from the snap-fit ​​rod 10, pulls out the hot melt adhesive bucket, replaces it with a new bucket, snaps it again and fixes it stably, and the operation can be resumed.

[0040] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

[0041] In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise explicitly described, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their specific circuit structures will not be elaborated here. In all the solutions mentioned above, those involving motors can be used with a reducer if necessary. The connection structure and working principle between the motor and the reducer are existing, well-known technologies, and will not be elaborated here.

Claims

1. A dual-barrel, separately controlled hot melt adhesive machine, comprising an operating table (1), a dual-barrel hot bonding mechanism, a barrel clamping mechanism, and a stabilizing mechanism, characterized in that: The double-barrel heat-bonding mechanism includes a constant temperature barrel (2) and a transverse frame (3). A mounting platform (4) is installed at the top of the operating table (1). The constant temperature barrel (2) is symmetrically mounted on the mounting platform (4). A side fixing plate (5) and a hydraulic cylinder (6) are installed on the transverse frame (3). A heat-bonding plate (7) is installed at one end of the hydraulic cylinder (6). A support plate (8) is installed at the bottom end of the side fixing plate (5). The heat-bonding plate (7) can be immersed in the constant temperature barrel (2). The heat-bonding plate (7) and the support plate (8) are connected. 8) The barrel clamping mechanism includes a clamping pipe (9) and a clamping rod (10). A rotating ring (11) is installed on the upper limit of the outer wall of the clamping pipe (9). A pulling rod (12) is installed on the rotating ring (11). A rotating plate (13) is installed on the side wall of the clamping pipe (9) and a connecting rod (14) is installed between the rotating plate (13) and the pulling rod (12). A top ring (15) is installed at the bottom end of the rotating ring (11).

2. The dual-barrel, separately controlled hot melt adhesive machine according to claim 1, characterized in that: The stabilizing mechanism includes a threaded ring (16) and a spring pin (17). The threaded ring (16) is threaded onto the outer wall of the clamping tube (9). A directional ring (18) is slidably installed on the outer wall of the clamping tube (9). A thrust bearing (19) is installed between the directional ring (18) and the threaded tube. Multiple sets of spring pins (17) are installed on the directional ring (18). A spring groove (20) is opened at the bottom end of the top ring (15). In the initial state, the spring pins (17) push against the spring groove (20) step by step, so that the top ring (15) and the rotating ring (11) rotate stably. The directional ring (18) moves further, so that the spring pins (17) are stably embedded in the spring groove (20), and the rotating ring (11) is fixed on the clamping tube (9).

3. The dual-barrel, separately controlled hot melt adhesive machine according to claim 1, characterized in that: The constant temperature barrel (2) is provided with a mounting bracket (301), and a side plate (21) is installed on the side of the mounting bracket (301), and the clamping pipe (9) is installed on the side plate (21).

4. The dual-barrel, separately controlled hot melt adhesive machine according to claim 1, characterized in that: A side frame (22) is installed on the top side of the operating table (1), and a transverse component (23) is installed on the side frame (22).

5. A dual-barrel, separately controlled hot melt adhesive machine according to claim 1, characterized in that: The transverse frame (3) is mounted on the transverse assembly (23), and two sets are provided on the transverse assembly (23).

6. A dual-barrel, separately controlled hot melt adhesive machine according to claim 3, characterized in that: A connecting plate (24) is installed at the bottom of the side wall of the card tube (9), and the connecting plate (24) is fixedly installed on the side plate (21).

7. A dual-barrel, separately controlled hot melt adhesive machine according to claim 3, characterized in that: One end of the snap-fit ​​rod (10) can pass through the mounting platform (4) and further through the side plate (21) to engage with the snap-fit ​​tube (9).

8. A dual-barrel, separately controlled hot melt adhesive machine according to claim 1, characterized in that: One end of the snap-fit ​​rod (10) is equipped with a limiting block (25), and one end face of the limiting block (25) is in contact with the bottom end of the mounting platform (4) for support.

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