Bottle cap capping equipment

Abstract

The invention relates to the field of filling beverage production technologies, and provides bottle cap pressing equipment which comprises a conveying belt used for conveying bottle bodies, a containing frame installed above the conveying belt and a cap pressing mechanism installed above the conveying belt. The placement frame is provided with a placement groove, the placement groove extends in the length direction of the conveying belt, and a plurality of bottle caps are sequentially placed in the placement groove in the length direction of the placement groove; the heights of the placing grooves are gradually reduced in the conveying direction of the conveying belt; the placing frame is provided with a pressing strip, and the pressing strip is used for abutting against the upper surfaces of the bottle caps in the placing groove; the bottle body is conveyed to the lower part of the capping mechanism after passing through the placing rack; the cover pressing mechanism is provided with a cover pressing face which extends in the length direction of the conveying belt. The distance between the cover pressing face and the conveying belt is gradually reduced in the conveying direction of the conveying belt. The beverage filling production line has the effect of improving the production efficiency of the beverage filling production line.

Description

Technical Field

[0001] The present application relates to the field of bottled beverage production technology, and in particular to a bottle capping device. Background Art

[0002] In the field of bottled beverage production, with the ever-increasing market demand, efficient production line operation is crucial to a company's productivity. Beverage filling lines involve multiple key processes, among which the installation of bottle caps after the bottle is filled is a crucial step in ensuring product sealing and quality. Efficient and stable bottle cap installation technology can ensure smooth production line operation, improve product quality and output, and meet the market's growing demand for beverages.

[0003] The traditional method of installing a bottle cap typically involves moving a bottle under a pressing head, then using a clamp to grip the cap and move it toward the bottle, pressing it onto the bottle to complete the installation. In some production scenarios, manual assistance is also used to ensure the accuracy of bottle cap installation. In addition, some use more complex mechanical positioning devices to accurately determine the position of the bottle and cap before the capping operation.

[0004] However, the traditional installation process requires stopping the conveyor belt that transports the bottles, which makes continuous processing impossible. This discontinuous processing method has limited the improvement of production efficiency to a certain extent. Summary of the Invention

[0005] In order to improve the production efficiency of a beverage filling production line by increasing the capping efficiency, the present application provides a bottle capping device.

[0006] The bottle cap pressing device provided in this application adopts the following technical solution: A bottle capping device comprises a conveyor belt for conveying bottle bodies, a placement rack installed above the conveyor belt and a capping mechanism installed above the conveyor belt; the placement rack has a placement slot, which extends along the length direction of the conveyor belt, and multiple bottle caps are placed in the placement slot in sequence along its own length direction; along the conveying direction of the conveyor belt, the height of the placement slot gradually decreases; the placement rack is provided with a pressure strip, which is used to abut against the upper surfaces of the multiple bottle caps in the placement slot; the bottle body is conveyed to the bottom of the capping mechanism after passing through the placement rack; the capping mechanism has a capping surface, which extends along the length direction of the conveyor belt; along the conveying direction of the conveyor belt, the distance between the capping surface and the conveyor belt gradually decreases.

[0007] By adopting the above technical solution, the bottles are transported by a conveyor belt, so that continuous transportation of the bottles can be achieved; the placement rack is provided with a placement groove extending along the length direction of the conveyor belt, and the height of the placement groove gradually decreases along the conveying direction, so that multiple bottle caps can be placed in sequence and automatically slide down under the action of gravity; the pressure strip abuts against the upper surface of the bottle cap to ensure that the bottle caps are stably arranged; the capping surface of the capping mechanism extends along the length direction of the conveyor belt and the distance from the conveyor belt gradually decreases, so that the capping operation can be completed during the bottle conveying process without stopping the conveyor belt, which facilitates continuous processing and improves processing efficiency.

[0008] Optionally, the cover pressing mechanism includes a mounting frame and an annular transmission belt, and the transmission belt is sleeved on the mounting frame; the lower surface of the transmission belt is the cover pressing surface; when force in the transmission direction of the transmission belt is applied to the lower surface of the transmission belt, the transmission rotates along the transmission direction of the first transmission belt.

[0009] By adopting the above-mentioned technical solution, the conveyor belt continuously transports the bottles, and the placement slots of the placement rack can sequentially place multiple bottle caps along their length. The bottle caps are stabilized by the pressure strips abutting against them, and the placement slots gradually decrease in height, causing the bottle caps to automatically roll forward under the action of gravity, eliminating the need for manual placement of the bottle caps one by one. After the bottles are capped by the placement rack, they are conveyed to the bottom of the capping mechanism consisting of the mounting rack and the endless transmission belt. Because the lower surface of the transmission belt is the capping surface and the distance from the conveyor belt gradually decreases, as the conveyor belt transports the bottles, the capping surface automatically presses the bottle caps onto the bottles, achieving a continuous capping operation without stopping the conveyor belt, facilitating continuous processing and improving processing efficiency. At the same time, the transmission belt can rotate along the conveyor belt's transmission direction, better coordinating with the movement of the bottles and preventing damage to the bottle caps or bottles due to relative sliding.

[0010] Optionally, the mounting frame is provided with a driving member, and the driving member is used to drive the transmission belt to move along the transmission direction of the conveyor belt.

[0011] By adopting the above technical solution, the transmission belt is actively moved along the conveying direction of the conveyor belt, making the capping process more stable and efficient, facilitating continuous processing, and improving the processing efficiency of the bottle cap capping equipment.

[0012] Optionally, a plurality of abutment rods are protruding from the surface of the transmission belt, and the abutment rods extend along the width direction of the transmission belt. The plurality of abutment rods are arranged at equal intervals along the length direction of the transmission belt, and the abutment rods are used to abut against the upper surface of the bottle cap.

[0013] By adopting the above technical solution, in the bottle capping equipment, the conveyor belt conveys the bottle body, the placement slot of the placement rack places multiple bottle caps, the pressing strips abut the bottle caps, and the bottle body passes through the placement rack and is placed under the capping mechanism. The capping mechanism has a capping surface whose distance from the conveyor belt gradually decreases along the conveying direction of the conveyor belt. On this basis, a plurality of abutting strips extending along the width direction and arranged at equal intervals are provided on the surface of the transmission belt to abut against the upper surface of the bottle cap, which can better press the bottle cap onto the bottle body and ensure the capping effect.

[0014] Optionally, the cross-section of the abutment is circular, the abutment rod is rotatably connected to the transmission belt, and the abutment rod rotates relative to the transmission belt around its own central axis.

[0015] By adopting the above technical solution, the conveyor belt conveys the bottle body, the placement groove on the placement rack can place multiple bottle caps, the pressure strip abuts the bottle cap, and the bottle body passes through the placement rack and is placed under the capping mechanism. The distance between the capping surface of the capping mechanism transmission belt and the conveyor belt gradually decreases, which can press the bottle cap onto the bottle body. The abutment rod has a circular cross-section and is rotatably connected to the transmission belt and rotates relative to the transmission belt around its own central axis, which can reduce the friction resistance between the abutment rod and the bottle cap, so that the bottle cap can be pressed onto the bottle body more smoothly, thereby improving the capping efficiency and stability.

[0016] Optionally, a smoothing portion is provided at the free end of the pressure strip, and the lower surface of the smoothing portion is arranged horizontally and is used to fit with the upper surface of the bottle cap located on the bottle body.

[0017] By adopting the above technical solution, in the bottle cap pressing equipment, the lower surface of the smoothing part of the pressure strip is horizontally fitted with the bottle cap on the bottle body, so that the bottle cap can be placed more flat, which is conducive to the smooth progress of subsequent capping operations and improves the capping quality.

[0018] Optionally, a linkage bar is provided at the end of the smoothing portion away from the pressure strip, and one end of the linkage bar away from the smoothing portion abuts against the upper surface of the transmission belt.

[0019] By adopting the above technical solution, during the capping process, the linkage bar moves along with the transmission belt, which can ensure the stability of the coordinated operation of various components of the equipment, make the capping process smoother, and further improve the operating stability and reliability of the bottle capping equipment, thereby helping to improve the processing efficiency of the filling beverage production line.

[0020] Optionally, connecting parts are provided on both sides of the pressure strip, and a vibrating member is connected to one end of the connecting part away from the pressure strip; when the end of the linkage bar abuts against the highest point of the abutting rod, the vibrating member abuts against the bottom of the placement rack.

[0021] By adopting the above technical scheme, the bottle bodies are conveyed by the conveyor belt, and the placement slots of the placement rack can place multiple bottle caps along the length direction of the conveyor belt, and the height is gradually reduced. The pressure strips abut against the bottle caps to ensure their stable arrangement, so that the bottle bodies can continuously obtain bottle caps; the height of the pressing surface of the pressing mechanism is gradually reduced, and the bottle caps can be pressed onto the bottle bodies without stopping the conveyor belt, thereby realizing continuous processing and improving efficiency; the transmission belt serves as the pressing surface and can rotate with the conveyor belt to facilitate the pressing operation; the driving member drives the transmission belt to move to further assist the pressing of the caps; the abutment rod contacts the bottle caps, increasing friction and facilitating the pressing of the caps; the abutment rod has a circular cross-section and is rotatable, reducing friction and protecting the bottle caps; the smoothing part makes the bottle caps flatter; the linkage bar transmits motion; when the end of the linkage bar abuts the highest point of the abutment rod, the vibrating member abuts the bottom of the placement rack, and the bottle caps in the placement slot are caused to slide down smoothly and be replenished through vibration, thus avoiding blockage, ensuring continuous supply of caps, and further improving the working efficiency and stability of the pressing equipment.

[0022] Optionally, the placement rack is provided with a first abutment, which extends along the width direction of the placement groove; there is a gap between the first abutment and the pressure strip, and the first abutment is used for abutting the upper surface of the free end of the pressure strip.

[0023] By adopting the above technical solution, when the bottle body passes through the bottle cap at the end of the placement groove and brings the bottle cap to itself, the bottle cap will have a process of turning from tilted to horizontal, so the end of the bead will be raised. At this time, the first abutment member forms an abutment limit for the bead, preventing the bead from being raised too much, and ensuring that the bead limits the other bottle caps still located in the limiting groove.

[0024] Optionally, the placement rack is provided with an abutment rod, the abutment bar is extended along the length direction of the pressure strip, and the pressure strip is located between the placement rack and the abutment bar; the end of the abutment bar is provided with a second abutment member, and the second abutment member is used for abutment of the middle position of the pressure strip.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting an inclined capping surface on the capping mechanism, the capping surface of the capping mechanism extends along the length direction of the conveyor belt and the distance from the conveyor belt gradually decreases. The capping operation can be completed during the bottle conveying process without stopping the conveyor belt, which facilitates continuous processing and improves processing efficiency. 2. The driving member drives the transmission belt to move, further assisting in capping; the abutment rod contacts the bottle cap, increasing friction and facilitating capping; the abutment rod has a circular cross-section and is rotatable, reducing friction and protecting the bottle cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of Example 1 of the present application.

[0027] Figure 2 It is a schematic diagram for showing the structure of the placement groove in Example 1.

[0028] Figure 3 It is a schematic diagram for showing the structure of the placement rack in Example 1.

[0029] Figure 4 It is a schematic diagram for showing the structure of the second abutment member in Example 1.

[0030] Figure 5 It is a structural diagram of the cover pressing mechanism used in the temporary embodiment 1.

[0031] Figure 6 It is a structural diagram of Example 2 of the present application.

[0032] Figure 7 It is a structural diagram of Example 3 of the present application.

[0033] Explanation of the accompanying drawings: 1. Conveyor belt; 2. Placement rack; 21. Placement groove; 22. Pressure strip; 221. Connecting part; 222. Vibrating part; 23. Smoothing part; 231. Linkage bar; 24. First abutment part; 25. Abutment bar; 26. Second abutment part; 261. Bolt; 262. Nut; 3. Covering mechanism; 31. Covering surface; 32. Mounting rack; 33. Transmission belt; 34. Abutment rod. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-7 This application is described in further detail.

[0035] The embodiment of the present application discloses a bottle cap pressing device. Example

[0036] Reference Figures 1 to 3 A bottle capping device includes a conveyor belt 1 for conveying bottles, a placement rack 2 installed above the conveyor belt 1, and a capping mechanism 3 installed above the conveyor belt 1. The placement rack 2 is installed above the conveyor belt 1 and can convey the bottle caps to the appropriate position. The bottles are conveyed on the conveyor belt 1, and after the bottle caps are picked up by the placement rack 2, they are conveyed to the bottom of the capping mechanism 3, which presses the bottle caps onto the bottle. During the entire process, the bottle caps can be placed and capped while being conveyed, without stopping the conveyor belt 1, achieving continuous capping operation and improving production efficiency.

[0037] Specifically, the placement rack 2 has a placement slot 21, which extends along the length of the conveyor belt 1 to facilitate the smooth placement of subsequent bottle caps on the bottle body. Multiple bottle caps are placed in the placement slot 21 along its own length, which can achieve continuous supply of caps.

[0038] The placement groove 21 is set at an angle, that is, along the conveying direction of the conveyor belt 1, the height of the placement groove 21 is gradually reduced, so that the bottle caps in the placement groove 21 can gradually slide down under the action of their own gravity, so that the bottle caps can fall smoothly onto the bottle body. The placement rack 2 is provided with a pressure strip 22, one end of the pressure strip 22 is connected to the placement rack 2, and the other end is movable. The pressure strip 22 is extended along the length direction of the placement groove 21, and the pressure strip 22 is used to abut against the upper surface of multiple bottle caps in the placement groove 21. The pressure strip 22 can be made of an elastic metal strip, which has a pressing effect on the bottle caps to prevent the bottle caps from falling during the sliding process. The pressure strip 22 cooperates with the placement groove 21 to ensure that the bottle caps slide down in an orderly manner to the appropriate position to wait for combination with the bottle body.

[0039] Furthermore, the free end of the bead 22 is connected to a smoothing portion 23, the lower surface of the smoothing portion 23 is horizontally arranged and is used for abutting the upper surface of the bottle cap connected to the bottle body to ensure the stability of the bottle cap on the bottle body. In this embodiment, the smoothing portion 23 is integrally formed with the bead 22, and the material of the smoothing portion 23 is the same as that of the bead 22. Furthermore, the placement rack 2 is provided with a first abutment 24, which extends along the width of the placement rack 2. The first abutment 24 is used to abut the upper surface of the free end of the bead 22, thereby limiting the bead 22 when the free end of the bead 22 moves upward, preventing the bead 22 from moving upward too much due to inertia and causing the bottle cap to fall. In this embodiment, the first abutment 24 is a rod-shaped structure and is mounted at the end of the placement rack 2.

[0040] Reference Figure 4 Furthermore, the placement rack 2 is provided with an abutment bar 25 that extends along the length of the pressure strip 22. The pressure strip 22 is located between the abutment bar 25 and the placement slot 21. A second abutment member 26 is provided at the end of the abutment bar 25. The second abutment member 26 is used to abut the upper surface of the middle portion of the pressure strip 22. In this embodiment, the second abutment member 26 includes a bolt 261 and a nut 262. A through-hole is formed at the end of the abutment bar 25. The screw of the bolt 261 passes through the through-hole, and the nut 262 is threadedly engaged with the screw. This achieves a detachable connection between the second abutment member 26 and the abutment bar 25.

[0041] Reference Figure 6 The capping mechanism 3 includes a capping surface 31 extending along the length of the conveyor belt 1. The distance between the capping surface 31 and the conveyor belt 1 gradually decreases along the conveying direction of the conveyor belt 1. The capping surface 31 is used to abut against the upper surface of the bottle cap placed on the bottle body, pressing the bottle cap downward. Its extension along the length of the conveyor belt 1 covers a certain conveying distance, facilitating continuous downward pressure on the bottle cap during bottle conveyance. As the bottle body and the cap pass through the capping surface 31, the cap is gradually pressed down onto the bottle body, completing the capping operation.

[0042] Specifically, the capping mechanism 3 includes a mounting frame 32 and an annular transmission belt 33, which is sleeved onto the mounting frame 32. The lower surface of the transmission belt 33 serves as the capping surface 31. When a force in the conveying direction of the conveyor belt 1 is applied to the lower surface of the transmission belt 33, the transmission belt 33 rotates in the same direction, causing the transmission belt 33 to move synchronously with the bottle body. This keeps the bottle cap and the surface abutting the bottle cap relatively stationary, ensuring the stability of the bottle body's movement on the conveyor belt 1.

[0043] In this embodiment, the mounting frame 32 is further provided with a driving member for driving the transmission belt 33 to move along the conveying direction of the conveyor belt 1. The driving member can be a motor, the output shaft of which is connected to the rotating component of the transmission belt 33 via a chain or belt, providing power to the transmission belt 33, causing it to rotate actively, thereby better coordinating with the conveying speed of the conveyor belt 1 and accurately controlling the capping process.

[0044] The working principle of the embodiment is as follows: after the beverage is filled in the bottle, the conveyor belt 1 drives the bottle filled with the beverage to move to the bottom of the placement rack 2. During the continued movement, the bottle cap in the placement slot 21 moves to the bottle mouth of the bottle.

[0045] Conveyor belt 1 then drives the bottle caps to the bottom of conveyor belt 33. Because the capping surface 31 of conveyor belt 33 is tilted and it can be driven around mounting bracket 32, conveyor belt 33 gradually applies force to the bottle caps, pressing them against the bottles and completing the installation process. During this process, conveyor belt 1 does not need to be shut down, ensuring production line efficiency. Furthermore, a separate drive source is not required for cap placement, reducing energy consumption.

[0046] Example 2 Reference Figure 6 The difference between this embodiment and embodiment 1 is that a plurality of abutment rods 34 are protruding from the surface of the transmission belt 33, and the abutment rods 34 extend along the width direction of the transmission belt 33. The plurality of abutment rods 34 are arranged at equal intervals along the length direction of the transmission belt 33, and the abutment rods 34 are used to abut against the upper surface of the bottle cap.

[0047] In this embodiment, the abutment rod 34 is made of a rigid material (such as stainless steel) and has a circular cross-section. The abutment rod 34 is rotatably connected to the transmission belt 33, and the abutment rod 34 rotates relative to the transmission belt 33 about its own central axis. With this design, if the transmission speed of the transmission belt 33 slightly differs from the transmission speed of the conveyor belt 1, the rotation of the abutment rod 34 can produce a certain relative displacement between the bottle cap and the transmission belt 33, ensuring that the bottle body is always placed upright on the conveyor belt 1, thereby ensuring the stability of the bottle body on the conveyor belt 1 during the capping process.

[0048] Furthermore, a linkage bar 231 is provided at the end of the smoothing portion 23 away from the pressure strip 22, and one end of the linkage bar 231 away from the smoothing portion 23 abuts against the upper surface of the transmission belt 33. Connecting portions 221 are provided on both sides of the pressure strip 22, and one end of the connecting portion 221 away from the pressure strip 22 is connected to a vibrating member 222. When the end of the linkage bar 231 abuts against the highest point of the abutting rod 34, the vibrating member 222 abuts against the bottom of the placement rack 2. During the rotation of the transmission belt 33, the multiple abutting rods 34 move to the end positions of the linkage bar 231 in sequence. Under the intermittent action of the multiple abutting rods 34, the pressure strip 22 is driven to vibrate through the linkage bar 231. When the pressure strip 22 vibrates, the vibrating member 222 is driven to intermittently hit the bottom of the placement rack 2, thereby vibrating the placement rack 2 to prevent the bottle caps from getting stuck in the placement slot 21.

[0049] Example 3 Reference Figure 7 The difference between this embodiment and embodiment 1 is that a plurality of abutment rods 34 are protruding from the surface of the transmission belt 33, and the abutment rods 34 extend along the width direction of the transmission belt 33. The plurality of abutment rods 34 are arranged at equal intervals along the length direction of the transmission belt 33, and the abutment rods 34 are used to abut against the upper surface of the bottle cap.

[0050] In the present embodiment, the abutment rod 34 is made of elastic material, and the abutment rod 34 is adhesively fixed to the surface of the transmission belt 33. From one side close to the transmission belt 33 to the other side, the diameter of the abutment rod 34 first increases and then decreases. With this design, in the process that the bottle body is conveyed, the abutment rod 34 is away from the side of the placement rack 2 and first abuts the bottle cap, and then under the action of the transmission belt 33 and the bottle cap, the abutment rod 34 is squeezed, and the squeezed abutment rod 34 is filled between the transmission belt 33 and the bottle cap, and plays a certain buffering effect to the bottle cap, reducing the possibility of the bottle cap being deformed; at the same time, after the abutment rod 34 is squeezed, under the supplement of the abutment rod 34, the surface in contact with the bottle cap is a plane, and under the action of the abutment rod 34, the middle position of the bottle cap can be certain pressed, so that the bottle cap can be slightly rotated, thereby simulating the plane pressing to a certain extent, so that the bottle cap can be more smoothly installed on the bottle body, also reducing the possibility of the bottle cap being deformed.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A bottle cap pressing device, characterized in that: The invention comprises a conveyor belt (1) for conveying bottles, a placement rack (2) installed above the conveyor belt (1), and a capping mechanism (3) installed above the conveyor belt (1); the placement rack (2) has a placement slot (21), the placement slot (21) is extended along the length direction of the conveyor belt (1), and a plurality of bottle caps are sequentially placed in the placement slot (21) along its own length direction; along the conveying direction of the conveyor belt (1), the height of the placement slot (21) gradually decreases; the placement rack (2) is provided with a pressure strip (22), and the pressure strip (22) is used to abut against the upper surfaces of the plurality of bottle caps in the placement slot (21); the bottle body is conveyed to the bottom of the capping mechanism (3) after passing through the placement rack (2); The capping mechanism (3) has a capping surface (31), and the capping surface (31) is extended along the length direction of the conveyor belt (1); along the conveying direction of the conveyor belt (1), the distance between the capping surface (31) and the conveyor belt (1) gradually decreases.

2. The bottle cap pressing device according to claim 1, characterized in that: The capping mechanism (3) comprises a mounting frame (32) and an annular transmission belt (33), wherein the transmission belt (33) is sleeved on the mounting frame (32); the lower surface of the transmission belt (33) is the capping surface (31); when a force in the transmission direction of the transmission belt (1) is applied to the lower surface of the transmission belt (33), the transmission rotates along the transmission direction of the first transmission belt (33).

3. The bottle cap pressing device according to claim 1, characterized in that: The mounting frame (32) is provided with a driving member, and the driving member is used to drive the transmission belt (33) to move along the transmission direction of the conveyor belt (1).

4. The bottle cap pressing device according to claim 1, characterized in that: A plurality of abutment rods (34) are protruding from the surface of the transmission belt (33), the abutment rods (34) extending along the width direction of the transmission belt (33), and the plurality of abutment rods (34) are arranged at equal intervals along the length direction of the transmission belt (33), and the abutment rods (34) are used to abut against the upper surface of the bottle cap.

5. The bottle cap pressing device according to claim 1, characterized in that: The cross section of the abutment is circular, the abutment rod (34) is rotatably connected to the transmission belt (33), and the abutment rod (34) rotates relative to the transmission belt (33) with its own central axis as the axis.

6. The bottle cap pressing device according to claim 1, characterized in that: The free end of the pressure strip (22) is provided with a smoothing portion (23), and the lower surface of the smoothing portion (23) is arranged horizontally and is used to fit with the upper surface of the bottle cap located on the bottle body.

7. The bottle cap pressing device according to claim 1, characterized in that: A linkage bar (231) is provided at the end of the smoothing portion (23) away from the pressure bar (22), and one end of the linkage bar (231) away from the smoothing portion (23) abuts against the upper surface of the transmission belt (33).

8. The bottle cap pressing device according to claim 7, characterized in that: Connecting parts (221) are provided on both sides of the pressure strip (22), and a vibrating member (222) is connected to one end of the connecting part (221) away from the pressure strip (22); when the end of the linkage strip (231) abuts against the highest point of the abutting rod (34), the vibrating member (222) abuts against the bottom of the placement rack (2).

9. The bottle cap pressing device according to claim 1, characterized in that: The placement rack (2) is provided with a first abutment member (24), and the first abutment member (24) is extended along the width direction of the placement groove (21); there is a gap between the first abutment member (24) and the pressure strip (22), and the first abutment member (24) is used for abutting the upper surface of the free end of the pressure strip (22).

10. The bottle cap pressing device according to claim 9, characterized in that: The placement rack (2) is provided with an abutment strip (25), and the abutment strip (25) is extended along the length direction of the pressure strip (22), and the pressure strip (22) is located between the placement rack (2) and the abutment strip (25); the end of the abutment strip (25) is provided with a second abutment member (26), and the second abutment member (26) is used for abutting the middle position of the pressure strip (22).

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