Portable baby chick transport case

Abstract

The utility model relates to the technical field of baby chick transport cases, in particular to a portable baby chick transport case, which is characterized in that a group of rectangular blocking frames are fixedly connected to the outer surface of a transport case main body, a sleeve is fixedly connected to the outer surface of the group of rectangular blocking frames, a bolt is slidably connected into the sleeve, and a first spring is sleeved on the outer surface of the bolt; the two inclined face limiting rings are fixedly connected to the outer surfaces of the sleeves and the plug pins correspondingly, after the multiple transport box bodies are stacked, the plug pins are pulled out and screwed by a half cycle to be reset, at the moment, the first springs drive the plug pins to be clamped into the rectangular blocking frames at the lower ends, and therefore the stacking positions of the two transport box bodies are fixed, and the stability during stacking is guaranteed; when a plurality of transport box bodies are stacked, the transport box bodies are connected in the mode, operation is easy and convenient, the transport box bodies are more stable and convenient to transport and carry, the stacking time is greatly saved, and particularly when a plurality of transport boxes need to be stacked, the transport boxes are more convenient to stack and transfer.

Description

Technical Field

[0001] This utility model relates to the technical field of chick transport boxes, and in particular to a portable chick transport box. Background Technology

[0002] Chick transport boxes are primarily used to provide a relatively stable and suitable environment for chicks during transfer, ensuring their survival rate and health during transport. They are widely used in scenarios such as chick allocation between chicken farms and chick sales transportation. In actual transportation, chicks are quite sensitive to environmental changes, and the transport box must have good ventilation, heat preservation, and shock absorption properties to meet the physiological needs of the chicks during transport. Currently, chick transport boxes typically require the following technologies in practical applications:

[0003] 1. Highly efficient ventilation technology ensures air circulation inside the transport container, maintaining suitable oxygen content and temperature and humidity;

[0004] 2. Reliable heat insulation technology prevents external temperature changes from having an excessive impact on the chicks;

[0005] 3. The robust structural design technology ensures that the transport box is not easily damaged during handling and transportation, effectively protecting the chicks;

[0006] 4. Convenient operating technology, facilitating the loading and unloading of chicks and the stacking and handling of transport boxes by staff;

[0007] 5. Hygienic cleaning technology, easy to clean and disinfect, preventing the growth and spread of germs.

[0008] Currently, various transport boxes and methods are used to ensure the safe transport of chicks. Some transport boxes use a simple plastic design with ventilation holes around the perimeter for air circulation, and are lined with simple insulation materials such as hay. Others use cardboard boxes with insulation layers, achieving insulation by attaching insulating foam boards to the surface. Additionally, some more professional transport boxes are equipped with independent ventilation fans and heating devices, powered by electricity to regulate the internal environment.

[0009] However, the above method has a prominent problem: the existing transport boxes are directly attached and stacked together during the transfer operation. This direct stacking installation method lacks convenient snap-fit ​​fixing function. Directly attaching and stacking requires staff to carefully align each transport box and shake it to ensure that they are stacked neatly. This process is cumbersome and time-consuming, especially when multiple transport boxes need to be stacked, which takes even longer and reduces the portability of the transport boxes. Utility Model Content

[0010] To address the shortcomings of existing technologies, this utility model provides a portable chick transport box, which solves the problem of the current method of directly attaching and stacking transport boxes together during transportation. This method lacks convenient snap-fit ​​fixing functions. Directly attaching and stacking requires workers to carefully align each transport box and shake it to ensure that they are stacked neatly. This process is cumbersome and time-consuming, especially when multiple transport boxes need to be stacked, which takes even longer and reduces the portability of the transport box.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A portable chick transport box includes a transport box body. The outer surface of the transport box body is provided with a protective and breathable shielding mechanism. The shielding mechanism includes a set of rectangular blocking frames, all of which are fixedly connected to the outer surface of the transport box body. The outer surface of the set of rectangular blocking frames is provided with a stacking and insertion limiting mechanism. The limiting mechanism includes a sleeve, a pin, and a first spring. The sleeve is fixedly connected to the outer surface of the set of rectangular blocking frames. The pin is slidably connected inside the sleeve and inserted into the inner surface of the set of rectangular blocking frames. The first spring is sleeved on the outer surface of the pin and the inner surface of the sleeve. The outer surfaces of the sleeve and the pin are provided with limiting mechanisms for restricting the placement angle. The limiting mechanism includes two inclined limiting rings, which are respectively fixedly connected to the outer surfaces of the sleeve and the pin.

[0013] Preferably, the main body of the transport box has an arc-shaped heat dissipation groove inside.

[0014] Preferably, each of the rectangular blocking frames has a through groove inside, and a box cover is rotatably connected to the upper end of the main body of the transport box.

[0015] Preferably, the upper end of the box cover is fixedly connected to a sloping locking block, and the upper end of the box cover is fixedly connected to a mounting base.

[0016] Preferably, a handle rod is rotatably connected inside the mounting base, and a U-shaped connecting frame is rotatably connected inside the handle rod.

[0017] Preferably, the U-shaped connecting frame has a sliding block inside, and the sliding block has a rectangular slot inside.

[0018] Preferably, a second spring is fitted onto the outer surface of the sliding block.

[0019] Preferably, the second spring is sleeved on the inner surface of the U-shaped connecting frame.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. After stacking multiple transport box bodies, pull out the pin and twist it half a turn to reset it. At this time, the first spring drives the pin to engage with the rectangular blocking frame at the lower end, thereby fixing the stacking position of the two transport box bodies and ensuring the stability of the stacking. When stacking multiple transport box bodies, they are connected in this way. The operation is simple and convenient, making the transport box bodies more stable and convenient to transport and carry, greatly saving stacking time. Especially when multiple transport boxes need to be stacked, it significantly improves work efficiency and makes the transport boxes more convenient to stack and transfer.

[0022] 2. During transportation operations, for the topmost box lid after stacking, the worker holds the surface of the U-shaped connecting frame and twists it to bring it close to the inclined block installed on one end of the transport box body. Under the action of the second spring, the sliding block inside the U-shaped connecting frame has a rectangular slot that engages with the surface of the inclined block. Then, the handle is pressed towards the end close to the box lid surface, and the handle pulls the U-shaped connecting frame to rotate. Due to the overall tilt, the sliding block rotates and fits against the plane of the inclined block, and the sliding block engages and limits the inclined block. Through the above operations, the adjacent topmost box lids are connected together laterally, increasing the overall width of the transport box body when stacked, increasing its contact area with the inside of the carriage, thereby preventing the topmost stacked transport box body from tipping over due to gravity. Attached Figure Description

[0023] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is an exploded view of the rectangular blocking frame connection of this utility model;

[0026] Figure 3 This is an exploded view of the pin connection of this utility model;

[0027] Figure 4 This is an exploded view of the U-shaped connecting frame of this utility model.

[0028] Legend: 11. Main body of the transport box; 12. Rectangular blocking frame; 13. Sleeve; 14. Pin; 15. First spring; 16. Inclined limiting ring; 17. Arc-shaped heat dissipation groove; 18. Through groove; 19. Box cover; 21. Inclined locking block; 22. Mounting base; 23. Handle rod; 24. U-shaped connecting frame; 25. Sliding block; 26. Rectangular slot; 27. Second spring. Detailed Implementation

[0029] This application provides a portable chick transport box that effectively solves the problem of existing transport boxes being directly stacked and attached together during transport operations. This method lacks convenient locking and securing mechanisms. Direct stacking requires workers to carefully align each transport box and shake it to ensure neat stacking, a cumbersome and time-consuming process, especially when stacking multiple boxes, thus reducing portability. After stacking multiple transport boxes, the pin is pulled out and rotated half a turn to reset. The first spring then engages the pin in the lower rectangular blocking frame, fixing the stacking position of the two transport boxes and ensuring stability. Multiple transport boxes are connected in this way, making the operation simple and convenient. This makes the transport boxes more stable and easier to carry, significantly saving stacking time. Especially when stacking multiple boxes, it significantly improves work efficiency and makes stacking and transport operations more convenient.

[0030] Example

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the technical solution in this application embodiment effectively solves the problem of existing transport boxes being directly attached and stacked together during transfer operations. This method lacks convenient snap-fit ​​fixing. Directly attaching and stacking requires workers to carefully align each transport box and shake it to ensure they are neatly stacked. This process is cumbersome and time-consuming, especially when multiple transport boxes need to be stacked, reducing the portability of the transport boxes. The overall concept is as follows: A portable chick transport box includes a transport box body 11. The outer surface of the transport box body 11 is provided with a protective and breathable shielding mechanism. The shielding mechanism includes a set of rectangular blocking frames 12, all of which are fixedly connected to the transport box body 11. 1. On the outer surface, a set of rectangular blocking frames 12 is provided with a limiting mechanism for stacking and insertion. The limiting mechanism includes a sleeve 13, a pin 14, and a first spring 15. The sleeve 13 is fixedly connected to the outer surface of the set of rectangular blocking frames 12. The pin 14 is slidably connected inside the sleeve 13 and inserted into the set of rectangular blocking frames 12. The first spring 15 is sleeved on the outer surface of the pin 14 and the inner surface of the sleeve 13. The outer surfaces of the sleeve 13 and the pin 14 are provided with a limiting mechanism for limiting the placement angle. The limiting mechanism includes two inclined limiting rings 16. The two inclined limiting rings 16 are fixedly connected to the outer surfaces of the sleeve 13 and the pin 14 respectively, and the two inclined limiting rings 16 are in contact with each other. The number of rectangular blocking frames 12 is four. Rectangular blocking frames 12 are installed around the transport box body 11. The rectangular blocking frames 12 at the upper end and the rectangular blocking frames 12 at the lower end of the transport box body 11 are compatible, that is, the rectangular blocking frames 12 at the upper end of the transport box body 11 are larger than the rectangular blocking frames 12 at the lower end. When two transport box bodies 11 are stacked, the rectangular blocking frames 12 at the upper end of the transport box body 11 can be fitted onto the outer surface of the rectangular blocking frames 12 at the lower end. During the transportation and transfer of chicks, multiple transport box bodies 11 are stacked together. Before stacking, the outer surface of the pin 14 is grasped and pulled outward. When the pin 14 slides, it will compress the first spring 15. After pulling it outward, it is twisted half a turn, that is, the lowermost end of the inclined limiting ring 16 installed on the outside of the pin 14. The surface will be perpendicular to the uppermost surface of the inclined limiting ring 16 installed at the upper end of the sleeve 13. At this time, the pin 14 is released, and under the elastic force of the compressed first spring 15, the pin 14 is driven to slide into the sleeve 13. At this time, through the contact of the two inclined limiting rings 16, the pin 14 is retracted into the sleeve 13. After the two transport box bodies 11 are stacked vertically together, the pin 14 is pulled out and rotated half a turn to reset it. At this time, the pin 14 is driven by the first spring 15 to be locked in the rectangular blocking frame 12 at the lower end, thereby ensuring the stability of the two transport box bodies 11 when stacked. The locking operation of the two pins 14 increases the stability during handling. When multiple transport box bodies 11 are stacked together, the rectangular blocking frames 12 act as a barrier.To avoid directly attaching multiple shipping container bodies 11 together.

[0032] The transport box body 11 has an arc-shaped heat dissipation groove 17 inside, and a set of rectangular baffles 12 each has a through groove 18 inside. The upper end of the transport box body 11 is rotatably connected to a box cover 19, and the upper end of the box cover 19 is fixedly connected to a sloping locking block 21. By twisting open the box cover 19, the chicks can be stored in the transport box body 11. The lower end of the box cover 19 is equipped with a plastic elastic card (the elastic card is made of an elastic material and has the characteristic of elastic deformation when subjected to force and returning to its original shape after the force is removed). The elastic card is engaged in the slot opened in the transport box body 11. The arc-shaped heat dissipation groove 17 and the through groove 18 are respectively opened in the transport box body 11 and the rectangular baffles 12 for heat dissipation.

[0033] A mounting base 22 is fixedly connected to the upper end of the box cover 19. A handle rod 23 is rotatably connected inside the mounting base 22. A U-shaped connecting frame 24 is rotatably connected inside the handle rod 23. A sliding block 25 is slidably connected inside the U-shaped connecting frame 24. A rectangular slot 26 is opened inside the sliding block 25, which is adapted to the inclined block 21. A second spring 27 is sleeved on the outer surface of the sliding block 25 and sleeved on the inner surface of the U-shaped connecting frame 24. During transportation, the box covers 19 at the top of the stack can be connected horizontally together to prevent the stacked transport box bodies 11 from tipping over due to gravity. A handle rod 23 is installed at the upper end of the box cover 19 (the handle rod 23 has three round holes, see the instruction manual). Figure 4 For reference, the functions of the round holes from left to right are as follows: the leftmost round hole is used to connect the mounting base 22, the middle round hole is used to install the U-shaped connecting bracket 24, and the rightmost round hole is used by the operator to hold and pull. The operator holds the surface of the U-shaped connecting bracket 24 and rotates it to approach the inclined block 21 installed on one end of the transport box body 11. The rectangular slot 26 opened in the sliding block 25 is used to engage the U-shaped connecting bracket 21. At this time, the handle rod 23 is pressed towards the end close to the surface of the box cover 19. The U-shaped connecting bracket 24 is rotated by the handle rod 23. At this time, due to the inclination of the overall length, the sliding block 25 will rotate and fit against the plane of the inclined block 21. The sliding block 25 engages and limits the inclined block 21 to increase the overall width of the transport box body 11 when stacking, so as to increase the contact area with the inside of the carriage and thus prevent tipping.

[0034] To address the problems existing in the prior art, this utility model provides a portable chick transport box. After stacking multiple transport box bodies 11, the pin 14 is pulled out and rotated half a turn to reset. At this time, the first spring 15 drives the pin 14 to engage with the lower rectangular blocking frame 12, thereby fixing the stacking position of the two transport box bodies 11 and ensuring the stability of the stacking. When multiple transport box bodies 11 are stacked, they are connected in this way. The operation is simple and convenient, making the transport box bodies 11 more stable and convenient to transport and carry, greatly saving stacking time. Especially when multiple transport boxes need to be stacked, it significantly improves work efficiency and makes the transport boxes more convenient to stack and transfer.

[0035] Transport box body 11: As the core load-bearing component of the chick transport box, it provides space for the chicks;

[0036] Rectangular barrier 12: It is fixedly connected to the outer surface of the main body 11 of the transport box and serves as a protective and breathable element;

[0037] Sleeve 13: Fixedly connected to the outer surface of rectangular blocking frame 12, providing a sliding track for pin 14;

[0038] Pin 14: It is slidably connected inside the sleeve 13 and can be inserted into the rectangular blocking frame 12. During the stacking of transport boxes, it works in conjunction with the first spring 15 and the inclined limiting ring 16 by pulling out, rotating and resetting. Pulling out the pin 14 makes it easier to stack the transport boxes. After resetting, it is locked into the rectangular blocking frame 12 under the elastic force of the first spring 15 to fix the stacking position of the transport boxes and ensure the stability when multiple transport boxes are stacked.

[0039] First spring 15: sleeved on the outer surface of pin 14 and located on the inner surface of sleeve 13, providing elastic force to pin 14;

[0040] Inclined limiting rings 16: They are fixedly connected to the outer surfaces of the sleeve 13 and the pin 14 respectively, and fit together. During the operation of the pin 14, the relative positions of the two inclined limiting rings 16 are changed by rotation, thereby locking and releasing the pin 14.

[0041] Arc-shaped heat dissipation groove 17: It is opened inside the main body 11 of the transport box and works together with the through groove 18 inside the rectangular baffle 12 to form an air circulation channel, which helps the air inside the transport box to exchange with the outside during the transportation of chicks.

[0042] Through slot 18: works in conjunction with the arc-shaped heat dissipation slot 17 inside the main body 11 of the transport box to form an air circulation channel, promote the circulation of air inside the transport box, and enhance the heat dissipation effect;

[0043] Box lid 19: Rotatably connected to the upper end of the transport box body 11, used to close the transport box body 11 and provide a relatively closed and safe space for the chicks;

[0044] Angled locking block 21: Fixedly connected to the upper end of the box cover 19, and adapted to the rectangular slot 26 of the sliding block 25 inside the U-shaped connecting frame 24;

[0045] Elastic card: Installed at the lower end of the box cover 19, made of elastic material, with the characteristic of elastic deformation when subjected to force and returning to its original shape after the force is removed. When the box cover 19 is closed, the elastic card is inserted into the slot opened in the transport box body 11 to achieve a stable connection between the box cover 19 and the transport box body 11, preventing the box cover 19 from opening during transportation and ensuring that the chicks are safely stored in the transport box.

[0046] Mounting base 22: Fixedly connected to the upper end of the cover 19, providing a rotation connection point for the handle 23;

[0047] Handle 23: Rotatably connected inside the mounting base 22, and rotatably connected inside the U-shaped connecting frame 24. By holding the handle 23 and performing operations such as pressing and rotating, the operator can drive the U-shaped connecting frame 24 to move, thereby achieving the locking and limiting of the sliding block 25 and the inclined plate block 21, which increases the stability of the transport box when stacking, and also makes it easier for the operator to move the transport box, reflecting the portability of the transport box.

[0048] U-shaped connecting frame 24: Rotatably connected inside the handle rod 23, with sliding block 25 slidably connected inside. When the operator operates the handle rod 23, the U-shaped connecting frame 24 moves accordingly, causing the sliding block 25 to move closer to or away from the inclined plate block 21, realizing the engagement and separation of the sliding block 25 and the inclined plate block 21, thereby completing the lateral connection and separation operation of adjacent box covers 19, enhancing or eliminating the lateral stability when transport boxes are stacked.

[0049] Sliding block 25: It is slidably connected inside the U-shaped connecting frame 24. The rectangular slot 26 inside it is adapted to the inclined block 21. When the sliding block 25 approaches the inclined block 21 under the action of the U-shaped connecting frame 24, the rectangular slot 26 is sleeved on the surface of the inclined block 21. Then, under the action of the handle rod 23, it rotates to fit the plane of the inclined block 21 and locks the inclined block 21 to limit the position, so as to realize the lateral connection of adjacent box covers 19 and increase the overall width and stability when the transport boxes are stacked.

[0050] Rectangular slot 26: It is formed inside the sliding block 25 and is adapted to the inclined block 21. By fitting the inclined block 21, the sliding block 25 and the inclined block 21 are connected, thereby realizing the lateral connection of adjacent box covers 19. It is a key connection structure to enhance the stacking stability of transport boxes.

[0051] The second spring 27 is sleeved on the inner surface of the U-shaped connecting frame 24 and located on the outer surface of the sliding block 25. It provides elastic force to the sliding block 25. When the sliding block 25 is close to the inclined plate block 21, the elastic force of the second spring 27 assists the rectangular slot 26 of the sliding block 25 to be sleeved on the surface of the inclined plate block 21, ensuring the tightness and stability of the connection, and further enhancing the reliability of the lateral connection of adjacent box covers 19 when the transport box is stacked.

[0052] Working principle:

[0053] The first step involves transporting and transferring the chicks. The lid 19 is opened by screwing it open, and the chicks are placed inside the transport box body 11. When the lid 19 is closed, the elastic clip at the bottom of the lid 19 engages with a slot in the transport box body 11, achieving a secure connection between the lid 19 and the transport box body 11. Multiple transport box bodies 11 are then moved into the truck bed and stacked. Before stacking, the pin 14 is grasped and pulled outwards. The pin 14 slides within the sleeve 13, compressing the first spring 15 and causing it to retract. The pin 14 is then screwed half a turn. At this point, the inclined limiting ring 16 on the pin 14 is perpendicular to the inclined limiting ring 16 on the sleeve 13. After releasing the pin 14, the compressed first spring 15 releases its elasticity, causing the pin 14 to slide into the sleeve 13. Due to the contact of the two inclined limiting rings 16, the pin 14 remains retracted within the sleeve 13. Two transport box bodies 11 are stacked vertically, with the larger rectangular baffle 12 at the top of the upper transport box body 11 fitting onto the outer surface of the smaller rectangular baffle 12 at the bottom of the lower transport box body 11. After stacking, the pin 14 is pulled out again and rotated half a turn to reset. At this time, the first spring 15 drives the pin 14 to engage with the lower rectangular baffle 12, thereby fixing the stacking position of the two transport box bodies 11 and ensuring the stability of the stack. When multiple transport box bodies 11 are stacked, they are connected in this way. At the same time, the blocking between the rectangular baffles 12 prevents the transport box bodies 11 from directly touching, further stabilizing the stacking structure. The arc-shaped heat dissipation groove 17 inside the transport box body 11 and the through groove 18 inside the rectangular baffle 12 work together to form an air circulation channel, which helps the air inside the transport box to exchange with the outside, realizes the heat dissipation function, and ensures that the chicks have a suitable ambient temperature during transportation.

[0054] In the second step, during the transportation operation, for the topmost box cover 19 after stacking, the worker holds the surface of the U-shaped connecting frame 24 and twists it to bring it close to the inclined block 21 installed on one end of the transport box body 11. Under the action of the second spring 27, the sliding block 25 inside the U-shaped connecting frame 24 has a rectangular slot 26 that fits onto the surface of the inclined block 21. Then, the handle 23 is pressed towards the end close to the surface of the box cover 19. The handle 23 pulls the U-shaped connecting frame 24 to rotate. Due to the overall tilt, the sliding block 25 rotates to fit against the plane of the inclined block 21 and locks the inclined block 21 through the sliding block 25. Through the above operation, the adjacent topmost box covers 19 are connected together laterally, increasing the overall width of the transport box body 11 when stacked, increasing its contact area with the inside of the carriage, thereby preventing the topmost stacked transport box body 11 from tipping over due to gravity and ensuring the stability of the transport box stacking during transportation.

[0055] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A portable chick transport box, comprising a transport box body (11), wherein the outer surface of the transport box body (11) is provided with a protective and breathable shielding mechanism, the shielding mechanism comprising a set of rectangular blocking frames (12), characterized in that, A set of rectangular blocking frames (12) are fixedly connected to the outer surface of the transport box body (11). A stacking and insertion limiting mechanism is provided on the outer surface of the set of rectangular blocking frames (12). The limiting mechanism includes a sleeve (13), a pin (14), and a first spring (15). The sleeve (13) is fixedly connected to the outer surface of the set of rectangular blocking frames (12). The pin (14) is slidably connected inside the sleeve (13). The pin (14) is inserted into the inside of the set of rectangular blocking frames (12). The first spring (15) is sleeved on the outer surface of the pin (14) and on the inner surface of the sleeve (13). The outer surfaces of the sleeve (13) and the pin (14) are provided with limiting mechanisms for limiting the placement angle. The limiting mechanisms include two inclined limiting rings (16), which are respectively fixedly connected to the outer surfaces of the sleeve (13) and the pin (14).

2. The portable chick transport box as described in claim 1, characterized in that, The two inclined limiting rings (16) are fitted together; The main body (11) of the transport box has an arc-shaped heat dissipation groove (17) inside.

3. A portable chick transport box as described in claim 2, characterized in that, Each of the rectangular blocking frames (12) has a through slot (18) inside; The upper end of the main body (11) of the transport box is rotatably connected to a box cover (19).

4. A portable chick transport box as described in claim 3, characterized in that, The upper end of the box cover (19) is fixedly connected to a sloping locking block (21); The upper end of the box cover (19) is fixedly connected to a mounting base (22).

5. A portable chick transport box as described in claim 4, characterized in that, The mounting base (22) is rotatably connected to a handle rod (23); The handle rod (23) is rotatably connected to a U-shaped connecting frame (24).

6. A portable chick transport box as described in claim 5, characterized in that, The U-shaped connecting frame (24) has a sliding block (25) slidably connected inside; The sliding block (25) has a rectangular slot (26) inside.

7. A portable chick transport box as described in claim 6, characterized in that, The rectangular slot (26) and the inclined block (21) are compatible; The outer surface of the sliding block (25) is fitted with a second spring (27).

8. A portable chick transport box as described in claim 7, characterized in that, The second spring (27) is sleeved on the inner surface of the U-shaped connecting frame (24).

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