Aseptic tank with cross valve group protection

Abstract

The utility model relates to aseptic tank technical field especially, it relates to a kind of aseptic tank with cross valve group protection. Including tank body and cross valve group, cross valve group is located at one end of tank body, three-way mechanism is installed between tank body and cross valve group, three-way mechanism includes three-way valve body, ball valve is rotatably connected in the inside of three-way valve body, rotating shaft is rotatably connected at the top of three-way valve body, the bottom of rotating shaft is fixed with ball valve, and fixed shell is fixed at the top of three-way valve body and located at the outside of rotating shaft. The utility model provides a kind of aseptic tank with cross valve group protection, by the cooperation of three-way valve body and ball valve, can let three-way valve body be installed between tank body and cross valve group, and then let the liquid inside cross valve group enter after filtering by ball valve, and then will not cause internal blockage of cross valve group due to long time cannot be washed, and can let the particle under filtration be discharged by the remaining outlet of three-way valve body, prevent accumulation.

Description

Technical Field

[0001] This utility model relates to the field of aseptic tank technology, and in particular to an aseptic tank with protection provided by a cross valve assembly. Background Technology

[0002] In the production processes of the food, beverage, dairy, and pharmaceutical industries, sterile liquid materials, after being killed and sterilized but before being filled, are buffered and stored in aseptic tanks, playing a regulatory role in the production process.

[0003] Patent document CN222911392U discloses an aseptic feeding and discharging device with a cross valve assembly, including a cross valve assembly, a steam pressure reducing unit, and a steam barrier unit. The cross valve assembly includes a T-type aseptic valve, an L-type aseptic valve, and a four-way connector. The steam pressure reducing unit includes a steam source, a steam filter, a steam pressure reducing valve, a steam pressure gauge, a steam shut-off valve, and a thick pipe. The steam barrier unit includes a first automatic angle seat valve, a second automatic angle seat valve, and the cross valve assembly. This utility model utilizes the cross valve assembly to switch the product flow direction. The steam pressure reducing unit provides clean and stable pressure steam to the steam barrier of the cross valve assembly. The steam barrier unit provides aseptic protection for the production of the cross valve assembly, and can perform steam sterilization under prolonged high-temperature conditions to meet the sterilization procedure before aseptic tank production, avoid microbial contamination, provide a simultaneous feeding and discharging option for aseptic tank production, ensure aseptic conditions during the production process, avoid microbial contamination, and meet the requirements for long shelf-life products.

[0004] When using the above technology, the following technical problems were found in the existing technology: when the existing aseptic tank is in use, the liquid entering the cross valve assembly will cause blockage of the cross valve assembly due to juice particles. Therefore, an aseptic tank with cross valve assembly protection is designed to provide another technical solution to the above technical problems. Utility Model Content

[0005] Therefore, it is necessary to provide an aseptic tank with cross valve assembly protection to address the above-mentioned technical problems, in order to solve the technical problem that when liquids entering the cross valve assembly enter the existing aseptic tank, the cross valve assembly will be blocked due to juice particles.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A sterile container with a cross valve assembly includes a container body and a cross valve assembly. The cross valve assembly is located at one end of the container body. A three-way mechanism is installed between the container body and the cross valve assembly. The three-way mechanism includes a three-way valve body, a ball valve, a rotating shaft, anti-rotation plates, an adjusting drive motor, and a fixed housing. The ball valve is rotatably connected inside the three-way valve body. The rotating shaft is rotatably connected to the top of the three-way valve body. The bottom of the rotating shaft is fixed to the ball valve. A fixed housing is fixed to the top of the three-way valve body and outside the rotating shaft. An adjusting drive motor is fixed to the top of the inner side of the fixed housing. The output end of the adjusting drive motor is connected to the rotating shaft. Anti-rotation plates are evenly distributed and fixed to the outer side of the rotating shaft and inside the fixed housing.

[0008] As a preferred embodiment of the sterile container with cross valve assembly protection provided by this utility model, the ball valve is composed of a first valve body and a second valve body. One end of the first valve body is fixed to the second valve body, and filter holes are evenly distributed inside the second valve body.

[0009] In a preferred embodiment of the aseptic canister with cross valve assembly protection provided by this utility model, a limiting component for restricting the rotation of the anti-rotation plate is installed at one end of the fixed shell. The limiting component includes a displacement plate, a guide rod, a tension spring, a limiting plate, a compression plate, and a displacement drive motor. A limiting plate is slidably connected to one side of the fixed shell and one end of the anti-rotation plate. A displacement plate is fixed to one side of the limiting plate. A guide rod is slidably connected inside the bottom end of the displacement plate. A tension spring is fixed between the displacement plate and the fixed shell. A displacement drive motor is fixed to the top of one side of the fixed shell. A compression plate is connected to the output end of the displacement drive motor and located between the displacement plate and the fixed shell.

[0010] As a preferred embodiment of the sterile container with cross valve assembly protection provided by this utility model, a connecting mechanism for connection is installed between the container body and the three-way mechanism, and between the three-way mechanism and the cross valve assembly. The connecting mechanism includes a first fixing plate, a connecting plate, a second fixing plate, an anti-detachment plate, and fastening bolts. The second fixing plate is provided at the bottom of the first fixing plate, and the connecting plates are rotatably connected to both sides of the first fixing plate. The connecting plates are slidably connected to the second fixing plate. The bottoms of both ends of the second fixing plate are slidably connected to the anti-detachment plates, and the anti-detachment plates are slidably connected to the connecting plates. Fastening bolts are provided inside the anti-detachment plates, and the tail ends of the fastening bolts are threadedly connected to the second fixing plate.

[0011] In a preferred embodiment of the sterile container with cross valve assembly protection provided by this utility model, positioning grooves are provided at the bottom of the two connecting plates at opposite ends, and the anti-detachment plate is slidably connected to the positioning grooves.

[0012] As a preferred embodiment of the sterile container with cross valve assembly protection provided by this utility model, the top and bottom of the two anti-detachment plates are provided with second compression slopes on both sides of one end close to each other, and the inner side of one end of the anti-detachment plate is provided with a first compression slope.

[0013] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0014] At the same time, through the above technical solutions, this utility model has at least the following beneficial effects:

[0015] This utility model provides a sterile tank with protection of a cross valve assembly. Through the cooperation of a three-way valve body and a ball valve, the three-way valve body can be installed between the tank body and the cross valve assembly. This allows the liquid entering the cross valve assembly to be filtered through the ball valve before entering, thus preventing the cross valve assembly from becoming clogged due to lack of cleaning over a long period of time. It also allows the filtered particles to be discharged through the other outlets of the three-way valve body, preventing accumulation.

[0016] Through the cooperation of the first valve body, the second valve body and the filter hole, the rotation of the rotating shaft can drive the ball valve to rotate, allowing the liquid to be filtered through the filter hole inside the second valve body and then enter one of the other two outlets of the three-way valve body, thus entering the interior of the cross valve assembly and also completing back flushing.

[0017] Through the cooperation of the displacement plate, tension spring, limiting plate and extrusion plate, the rotation of the extrusion plate can drive the displacement plate to move the limiting plate, and the tension spring can stretch and rebound to reset the limiting plate, thereby allowing the limiting plate to block the rotation plate and restrict the rotation angle of the rotating shaft. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0020] Figure 2 This is an exploded view of the present invention;

[0021] Figure 3 This is a schematic diagram of the connection mechanism of this utility model;

[0022] Figure 4 This is a schematic diagram of the anti-detachment plate of this utility model;

[0023] Figure 5 This is a schematic diagram of the internal structure of the fixing shell of this utility model;

[0024] Figure 6 This is a schematic diagram of the first adjustment angle of the ball valve of this utility model;

[0025] Figure 7 This is a schematic diagram of the second adjustment angle of the ball valve of this utility model;

[0026] Figure 8 This is a schematic diagram of the third adjustment angle of the ball valve of this utility model;

[0027] Figure 9 This is a schematic diagram of the structure of the ball valve of this utility model;

[0028] Figure 10 This is a schematic diagram of the structure of the limiting plate of this utility model.

[0029] In the diagram: 1. Tank body; 2. Three-way mechanism; 3. Cross valve assembly; 4. Connecting mechanism; 5. First fixing plate; 6. Connecting plate; 7. Positioning groove; 8. Second fixing plate; 9. Anti-detachment plate; 10. Fastening bolt; 11. First extrusion inclined surface; 12. Second extrusion inclined surface; 13. Three-way valve body; 14. Ball valve; 15. Rotating shaft; 16. Anti-rotation plate; 17. Adjustment drive motor; 18. Fixed shell; 19. First valve body; 20. Second valve body; 21. Filter hole; 22. Displacement plate; 23. Guide rod; 24. Tension spring; 25. Limiting plate; 26. Extrusion plate; 27. Displacement drive motor. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] Example 1

[0035] Reference Figure 1 , Figure 2 , Figures 5-8 A sterile container with a cross valve assembly includes a container body 1 and a cross valve assembly 3. The cross valve assembly 3 is located at one end of the container body 1, allowing liquid inside the container body 1 to enter the cross valve assembly 3. A three-way mechanism 2 is installed between the container body 1 and the cross valve assembly 3. The three-way mechanism 2 is used to filter particles in the liquid entering the cross valve assembly 3, preventing blockage of the cross valve assembly 3 and preventing it from being cleaned. The three-way mechanism 2 can also be used to flush the cross valve assembly 3 with external cleaning water.

[0036] The three-way mechanism 2 includes a three-way valve body 13, a ball valve 14, a rotating shaft 15, an anti-rotation plate 16, an adjusting drive motor 17, and a fixed housing 18. The ball valve 14 is rotatably connected inside the three-way valve body 13, so that the three-way valve body 13 has three connection ports. By rotating the ball valve 14, two of the three connection ports of the three-way valve body 13 can be connected, while the other connection port is closed. The rotating shaft 15 is rotatably connected to the top of the three-way valve body 13. The bottom of the rotating shaft 15 is fixed to the ball valve 14, so that the axis of the rotating shaft 15 corresponds to the center position of the ball valve 14, thereby allowing the rotation of the rotating shaft 15 to drive the ball valve 14 to rotate.

[0037] A fixed housing 18 is fixed to the top of the three-way valve body 13 and outside the rotating shaft 15. An adjustment drive motor 17 is fixed to the top of the inner side of the fixed housing 18. The output end of the adjustment drive motor 17 is connected to the rotating shaft 15, so that the operation of the adjustment drive motor 17 drives the rotating shaft 15 to drive the ball valve 14 to rotate. Anti-rotation plates 16 are evenly distributed and fixed to the outer side of the rotating shaft 15 and inside the fixed housing 18. A limiting component for limiting the rotation of the anti-rotation plate 16 is installed at one end of the fixed housing 18. The limiting component limits the rotation of a single anti-rotation plate 16, so that the rotating shaft 15 can only rotate forty-five degrees each time.

[0038] In this embodiment, there are eight anti-rotation plates 16, which are used to limit the rotation of the rotating shaft 15 to only 45 degrees when restricted by a single anti-rotation plate 16.

[0039] The ball valve 14 consists of a first valve body 19 and a second valve body 20. One end of the first valve body 19 is fixed to the second valve body 20, and the first valve body 19 and the second valve body 20 are integrally cut to form a circle. The outer sides of the first valve body 19 and the second valve body 20 can form a circle. The interior of the second valve body 20 is evenly provided with filter holes 21, so that particles or impurities in the liquid can be filtered through the filter holes 21 and the liquid can continue to flow through the second valve body 20. In turn, the rotation of the rotating shaft 15 can drive the first valve body 19 and the second valve body 20 to block the different outlets inside the three-way valve body 13.

[0040] In this embodiment, a storage battery can be fixed inside the fixed housing 18 to provide power to the adjustment drive motor 17 and the displacement drive motor 27.

[0041] The limiting assembly includes a displacement plate 22, a guide rod 23, a tension spring 24, a limiting plate 25, a pressing plate 26, and a displacement drive motor 27. The limiting plate 25 is slidably connected to one side of the fixed housing 18 and one end of the anti-rotation plate 16, so that when the anti-rotation plate 16 contacts the side of the limiting plate 25, the anti-rotation plate 16 cannot drive the rotating shaft 15 to rotate, so that the rotating shaft 15 drives the ball valve 14 to rotate forty-five degrees. The displacement plate 22 is fixed to one side of the limiting plate 25, so that the movement of the displacement plate 22 drives the limiting plate 25 to move synchronously. The guide rod 23 is slidably connected inside the bottom end of the displacement plate 22, so that the displacement plate 22 slides and translates outside the guide rod 23.

[0042] A tension spring 24 is fixed between the displacement plate 22 and the fixed shell 18. When the displacement plate 22 moves away from the fixed shell 18, it causes the tension spring 24 to stretch. When the external force of compression disappears, the displacement plate 22 returns to its original position through the rebound of the tension spring 24, causing the limiting plate 25 to limit the rotation stop plate 16. A displacement drive motor 27 is fixed to the top of one side of the fixed shell 18. A pressing plate 26 is connected to the output end of the displacement drive motor 27 and located between the displacement plate 22 and the fixed shell 18. The operation of the displacement drive motor 27 causes the pressing plate 26 to rotate. The end of the pressing plate 26 that is not connected to the output end of the displacement drive motor 27 presses the displacement plate 22 after rotation, causing the displacement plate 22 to move away from the fixed shell 18.

[0043] In this embodiment, a pressure sensor can be fixed on the side of the limiting plate 25 that contacts the anti-rotation plate 16, so that after the anti-rotation plate 16 contacts the limiting plate 25, the driving motor 17 is controlled to stop working by signal control.

[0044] In this embodiment, each structure has its own service life. In actual manufacturing and application, the corresponding structure made of different materials can be replaced according to the needs of use.

[0045] In this embodiment, the motor is a self-locking motor, which can drive the connected structure to rotate normally when it is powered on and working. When the motor stops working, it can prevent the connected structure from rotating through its self-locking function.

[0046] The following is the usage process of the sterile tank with cross valve assembly protection provided by this utility model: In use, the three-way mechanism 2 is installed between the tank body 1 and the cross valve assembly 3, so that the liquid can enter the cross valve assembly 3 after passing through the three-way mechanism 2. At this time, the drive motor 17 can be started according to the direction of liquid discharge. The drive motor 17 drives the ball valve 14 to rotate through the rotating shaft 15, so that the second valve body 20 on the ball valve 14 can be adjusted to an adjustable angle position. At the same time, the rotation of the rotating shaft 15 drives the anti-rotation plate 16 to rotate. When the anti-rotation plate 16 contacts the limiting plate 25, the rotation of the anti-rotation plate 16 is restricted. At this time, the rotating shaft 15 drives the ball valve 14 to rotate to a 45-degree position, so that the liquid can enter the cross valve assembly 3 after being filtered through the filter hole 21 on the second valve body 20.

[0047] When it is necessary to rinse the liquid or particles or impurities filtered by the filter pore 21, the displacement drive motor 27 can be used to drive the squeezing plate 26 to rotate. The rotation of the squeezing plate 26 squeezes the displacement plate 22, causing the displacement plate 22 to move away from the fixed shell 18 and drive the tension spring 24 to stretch. The movement of the displacement plate 22 also causes the limiting plate 25 to move. At this time, the limiting plate 25 does not limit the rotation of the anti-rotation plate 16. Then, the adjustment drive motor 17 is started to drive the rotating shaft 15 to drive the anti-rotation plate 16 to rotate. At the same time, the rotation of the squeezing plate 26 is released from the squeezing of the displacement plate 22. The displacement plate 22 is reset by the rebound after being stretched by the tension spring 24. The limiting plate 25 enters the interior of the fixed shell 18 to limit the rotation angle of the anti-rotation plate 16. Then, the second valve body 20 is rotated and placed in an inclined state, and the internal objects are discharged from the third outlet through rinsing.

[0048] Example 2

[0049] Reference Figures 1-4 A sterile container with protection of a cross valve assembly is provided. A connecting mechanism 4 is installed between the container body 1 and the three-way mechanism 2, and between the three-way mechanism 2 and the cross valve assembly 3. The connecting mechanism 4 includes a first fixing plate 5, a connecting plate 6, a second fixing plate 8, an anti-detachment plate 9, and fastening bolts 10. The second fixing plate 8 is provided at the bottom of the first fixing plate 5. The connection position between the container body 1 and the three-way mechanism 2 and the connection position between the three-way mechanism 2 and the cross valve assembly 3 are positioned by the cooperation of the first fixing plate 5 and the second fixing plate 8. The connecting plates 6 are rotatably connected to both sides of the first fixing plate 5, so that the connecting plates 6 can be rotated and adjusted by the rotatable connection with the first fixing plate 5. The connecting plates 6 are slidably connected to the second fixing plate 8, so that the connecting plates 6 can slide into the interior of the second fixing plate 8 and rise and fall inside the second fixing plate 8.

[0050] Anti-detachment plates 9 are slidably connected to the bottom of both ends of the second fixed plate 8. The anti-detachment plates 9 are concave and are slidably connected to the connecting plate 6. When the anti-detachment plates 9 enter the sliding interior of the second fixed plate 8 and the connecting plate 6, the connecting plate 6 and the second fixed plate 8 cannot be separated, and the connecting plate 6 cannot move inside the second fixed plate 8. The anti-detachment plates 9 are provided with fastening bolts 10 inside. The tail end of the fastening bolts 10 is threadedly connected to the second fixed plate 8, so that the position of the anti-detachment plates 9 inside the second fixed plate 8 can be fixed by the fastening bolts 10.

[0051] Preferably, the bottom of each of the two connecting plates 6, which are far apart from each other, is provided with a positioning groove 7. The anti-detachment plate 9 is slidably connected to the positioning groove 7, so that after the connecting plate 6 slides into the interior of the second fixing plate 8, the anti-detachment plate 9 slides into the inner side of the positioning groove 7 to achieve positioning.

[0052] Preferably, the top and bottom of the two anti-detachment plates 9 are provided with second extrusion slopes 12 on both sides of one end close to each other, so that the anti-detachment plates 9 can easily enter the interior of the second fixing plate 8 and the connecting plate 6 by translation. The inner side of one end of the anti-detachment plates 9 is provided with a first extrusion slope 11, so that when there is a certain deviation of the connecting plate 6 inside the second fixing plate 8, the anti-detachment plates 9 can enter the positioning groove 7 by extruding the connecting plate 6 through the first extrusion slope 11.

[0053] In this embodiment, to increase the sealing requirements, sealing rings can be provided between the tank body 1 and the three-way mechanism 2, and between the three-way mechanism 2 and the cross valve assembly 3.

[0054] The following is the usage process of the sterile container with cross valve assembly protection provided by this utility model: During use, the first fixing plate 5 is placed at the top of the connection between the container body 1 and the three-way mechanism 2, and at the top of the connection between the three-way mechanism 2 and the cross valve assembly 3. Simultaneously, the second fixing plate 8 is placed at the bottom of the connection between the container body 1 and the three-way mechanism 2, and at the bottom of the connection between the three-way mechanism 2 and the cross valve assembly 3. Then, the first fixing plate 5 is lowered and assembled by sliding, and the second fixing plate 8 is raised and assembled by sliding, so that the bottom sides of the first fixing plate 5 contact the second fixing plate 8. At this time, the connecting plate 6 is rotated downwards through a rotating connection, so that the connecting plate 6 enters the sliding interior of the second fixing plate 8. Then, the anti-detachment plate 9 is slidably installed inside the second fixing plate 8, and simultaneously, the anti-detachment plate 9 is pressed into the positioning groove 7 by the second pressing slope 12 and the first pressing slope 11, positioning the connecting plate 6 inside the second fixing plate 8. This makes the first fixing plate 5 and the second fixing plate 8 inseparable, achieving better fixation of the connection between the container body 1 and the three-way mechanism 2, and the connection between the three-way mechanism 2 and the cross valve assembly 3.

[0055] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. The present utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A sterile container with a cross valve assembly, comprising a container body (1) and a cross valve assembly (3), wherein the cross valve assembly (3) is located at one end of the container body (1), characterized in that, A three-way mechanism (2) is installed between the tank body (1) and the cross valve assembly (3). The three-way mechanism (2) includes a three-way valve body (13), a ball valve (14), a rotating shaft (15), an anti-rotation plate (16), an adjustment drive motor (17), and a fixed shell (18). The ball valve (14) is rotatably connected inside the three-way valve body (13). The rotating shaft (15) is rotatably connected to the top of the three-way valve body (13). The bottom of the rotating shaft (15) is fixed to the ball valve (14). The fixed shell (18) is fixed to the top of the three-way valve body (13) and outside the rotating shaft (15). The adjustment drive motor (17) is fixed to the top inside the fixed shell (18). The output end of the adjustment drive motor (17) is connected to the rotating shaft (15). Anti-rotation plates (16) are evenly distributed and fixed to the outside of the rotating shaft (15) and inside the fixed shell (18).

2. The aseptic container with cross valve assembly protection according to claim 1, characterized in that, The ball valve (14) is composed of a first valve body (19) and a second valve body (20). One end of the first valve body (19) is fixed to the second valve body (20), and filter holes (21) are evenly distributed inside the second valve body (20).

3. The aseptic container with cross valve assembly protection according to claim 1, characterized in that, One end of the fixed shell (18) is equipped with a limiting component for restricting the rotation of the anti-rotation plate (16). The limiting component includes a displacement plate (22), a guide rod (23), a tension spring (24), a limiting plate (25), a pressing plate (26), and a displacement drive motor (27). The limiting plate (25) is slidably connected to one side of the fixed shell (18) and one end of the anti-rotation plate (16). The displacement plate (22) is fixed to one side of the limiting plate (25). The guide rod (23) is slidably connected to the inside of the bottom end of the displacement plate (22). The tension spring (24) is fixed between the displacement plate (22) and the fixed shell (18). The displacement drive motor (27) is fixed to the top of one side of the fixed shell (18). The pressing plate (26) is connected to the output end of the displacement drive motor (27) and between the displacement plate (22) and the fixed shell (18).

4. A sterile container with cross valve assembly protection according to claim 1, characterized in that, A connecting mechanism (4) for connection is installed between the tank body (1) and the three-way mechanism (2), and between the three-way mechanism (2) and the cross valve group (3). The connecting mechanism (4) includes a first fixing plate (5), a connecting plate (6), a second fixing plate (8), an anti-detachment plate (9), and a fastening bolt (10). The bottom of the first fixing plate (5) is provided with the second fixing plate (8). The two sides of the first fixing plate (5) are rotatably connected with the connecting plate (6). The connecting plate (6) is slidably connected with the second fixing plate (8). The bottom of both ends of the second fixing plate (8) is slidably connected with the anti-detachment plate (9). The anti-detachment plate (9) is slidably connected with the connecting plate (6). The inside of the anti-detachment plate (9) is provided with a fastening bolt (10). The tail end of the fastening bolt (10) is threadedly connected to the second fixing plate (8).

5. A sterile container with cross valve assembly protection according to claim 4, characterized in that, The bottom of each of the two connecting plates (6) is provided with a positioning groove (7) at one end away from each other, and the anti-detachment plate (9) is slidably connected to the positioning groove (7).

6. A sterile container with cross valve assembly protection according to claim 4, characterized in that, The top and bottom of the two anti-detachment plates (9) are provided with second extrusion slopes (12) on both sides of one end close to each other, and the inner side of one end of the anti-detachment plate (9) is provided with first extrusion slopes (11).

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