Detachable semitrailer frame for container transportation

Abstract

The invention discloses a detachable semitrailer frame for container transportation, which comprises two longitudinal beam bodies, a cross beam assembly is arranged between the two longitudinal beam bodies, and the opposite sides of the two longitudinal beam bodies are both provided with fixing and supporting assemblies for installing a container. Movable supporting assemblies suitable for different containers are installed on the opposite sides of the two longitudinal beam bodies, connecting assemblies used for adjusting the movable supporting assemblies are installed in the two longitudinal beam bodies, and movable sliding grooves are formed in the opposite sides of the two longitudinal beam bodies; moving sliding blocks can slide in moving sliding grooves, so that the positions of a plurality of second moving supporting strip assembling plates are adjusted, the positions of a plurality of moving supporting strips are adjusted, the positions of a fixed end base and a side mounting base are adjusted, the semi-trailer body can adapt to containers of different length specifications, and the semi-trailer body is suitable for containers of different length specifications. And the universality and the using effect of the device are remarkably improved, and the application range of the device is widened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of semi-trailers, in particular to a detachable semi-trailer frame for container transportation. BACKGROUND

[0002] In the field of modern logistics transportation, containers have become one of the core carriers for cargo transportation due to their standardization and large capacity. The performance of semi-trailers, as the main transportation tool for containers, directly affects the transportation efficiency, safety and flexibility.

[0003] Traditional semi-trailers have poor adaptability to containers. The end seat and the support bar of the existing semi-trailers are usually fixed in position, and can only match containers of specific length specifications. However, in actual logistics transportation, the length specifications of containers are diverse. If different length containers need to be transported, corresponding specifications of semi-trailers need to be replaced, which leads to the need for logistics enterprises to reserve multiple semi-trailers of different models to meet the demand, increasing the cost of equipment purchase and causing resource waste of idle equipment. In addition, although some semi-trailers try to adapt to different containers by adding adjustable support bars, the adjustment structure design is simple, and manual plug-in type fixation is usually used, which is tedious and has low positioning accuracy. The connection stability of the support bar and the semi-trailer body after adjustment is insufficient, and the stability of the container during transportation cannot be guaranteed. SUMMARY

[0004] The present application aims to provide a detachable semi-trailer frame for container transportation to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a detachable semi-trailer frame for container transportation, comprising two longitudinal beam solids, a cross beam assembly is installed between the two longitudinal beam solids, a fixed support assembly for installing containers is installed on the opposite sides of the two longitudinal beam solids, a movable support assembly suitable for different containers is installed on the opposite sides of the two longitudinal beam solids, a connecting assembly for adjusting the movable support assembly is installed inside the two longitudinal beam solids, and a movable sliding groove is formed on the opposite sides of the two longitudinal beam solids.

[0006] Preferably, the cross beam assembly comprises a cross beam body, a cross beam pad plate is fixedly installed on the top of the cross beam body, cross beam assembly blocks are fixedly installed at both ends of the cross beam body, and side limiting plates are fixedly installed on one side of the cross beam assembly blocks.

[0007] Preferably, the interior of the cross beam assembly block is provided with a cross beam assembly threaded hole two, the opposite sides of the longitudinal beam solid body are fixedly provided with a cross beam assembly seat, the top and bottom of the interior of the cross beam assembly seat is provided with a cross beam assembly threaded hole one, the cross beam assembly block is clamped and installed in the interior of the cross beam assembly seat, the specification of the cross beam assembly threaded hole two is same with the specification of the cross beam assembly threaded hole one, and the interior of the cross beam assembly threaded hole one and the cross beam assembly threaded hole two is screwed with an assembly bolt.

[0008] Preferably, the bottom of the cross beam body is fixedly provided with a threading block, and the interior of the threading block is provided with a threading groove.

[0009] Preferably, the fixed support assembly comprises a fixed support strip assembly plate one and a fixed support strip assembly plate two, one side of the fixed support strip assembly plate one is fixedly connected with one side of the longitudinal beam solid body, one side of the fixed support strip assembly plate two is fixedly provided with a fixed support strip, one end of the fixed support strip away from the fixed support strip assembly plate two is fixedly provided with a fixed support block, the top of the fixed support block is fixedly provided with a moving end seat, and the interior of the fixed support strip assembly plate two and the fixed support strip assembly plate one is provided with a fixed support strip assembly threaded hole.

[0010] Preferably, the moving support assembly comprises a moving support strip assembly plate two and a moving support strip assembly plate one, one side of the moving support strip assembly plate two is fixedly connected with the connecting assembly, one side of the moving support strip assembly plate one is fixedly provided with a moving support strip, one end of the moving support strip away from the moving support strip assembly plate one is fixedly provided with a moving support block, the top of the moving support block is fixedly provided with a fixed end seat and a side mounting seat, and the interior of the moving support strip assembly plate one and the moving support strip assembly plate two is provided with a moving support strip assembly threaded hole.

[0011] Preferably, the interior of the moving end seat and the fixed end seat is provided with an end mounting threaded hole, and the interior of the fixed end seat, the moving end seat and the side mounting seat is provided with a side mounting threaded hole.

[0012] Preferably, the connecting assembly comprises a connecting block, a connecting rod is fixedly installed between two adjacent connecting blocks, one side of the connecting block is fixedly provided with a moving sliding block, and one side of the moving support strip assembly plate two is fixedly connected with one side of the moving sliding block.

[0013] Preferably, the top and bottom of the moving support strip and the fixed support strip are fixedly provided with a reinforcing strip.

[0014] Preferably, the specification size of the interior contour of the moving sliding groove is matched with the specification size of the exterior contour of the moving sliding block, the moving sliding block is slidingly installed in the interior of the moving sliding groove, the interior of the two longitudinal beam solid bodies is fixedly provided with a reinforcing ring, and the connecting block is slidingly installed on the inner side of the reinforcing ring.

[0015] Compared with the prior art, the beneficial effects of the present application are that the mobile slider is arranged to slide in the mobile sliding groove, thereby adjusting the position of the plurality of mobile support rod assembly plates II, adjusting the position of the plurality of mobile support rods, adjusting the position of the fixed end seat and the side mounting seat, and adapting the semitrailer body to containers of different length specifications, thereby significantly improving the versatility and use effect of the device, expanding the application range of the device, and additionally fixing the container on the top of the semitrailer body, which not only facilitates operation and greatly reduces the labor intensity of the workers, but also greatly improves the work efficiency when the container needs to be disassembled and replaced in the future,

[0016] The reinforcing rings arranged in the longitudinal beam body are made of high-strength material, which can effectively enhance the rigidity of the longitudinal beam body and further improve the overall rigidity and carrying capacity of the entire semitrailer body. When the semitrailer body bears the weight of the container, the reinforcing rings can disperse part of the stress and reduce the deformation amount of the longitudinal beam body, ensuring that the semitrailer body remains structurally stable during long-term use. Meanwhile, the connecting blocks inside the longitudinal beam body can freely slide inside the reinforcing rings. After the container is placed on the semitrailer body, the weight of the container is reasonably distributed, making the force on each part of the semitrailer body more uniform and further improving the stability and service life of the semitrailer body, thereby ensuring the safety of the entire transportation or use process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the present application.

[0018] Figure 2 It is another perspective three-dimensional structure schematic diagram of the present application.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the longitudinal beam body of the present application.

[0020] Figure 4 It is another perspective three-dimensional structure schematic diagram of the longitudinal beam body of the present application.

[0021] Figure 5 It is a schematic diagram of the longitudinal beam body of the present application.

[0022] Figure 6 It is a schematic diagram of the mobile assembly of the present application.

[0023] Figure 7 It is a schematic diagram of the beam assembly of the present application.

[0024] In the figure: 1, vertical beam solid; 2, reinforcing ring; 3, fixed end seat; 4, end mounting threaded hole; 5, side mounting threaded hole; 6, crossbeam pad plate; 7, moving strut assembly plate one; 8, moving strut; 9, moving support block; 10, fixed strut; 11, moving end seat; 12, reinforcing strip; 13, fixed strut assembly plate two; 14, moving strut assembly plate two; 15, moving sliding groove; 16, threading block; 17, threading groove; 18, side mounting seat; 19, fixed support block; 20, assembly bolt; 21, crossbeam body; 22, fixed strut assembly threaded hole; 23, fixed strut assembly plate one; 24, moving strut assembly threaded hole; 25, crossbeam assembly seat; 26, crossbeam assembly threaded hole one; 27, connecting block; 28, connecting rod; 29, moving sliding block; 30, side limiting plate; 31, crossbeam assembly block; 32, crossbeam assembly threaded hole two. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0026] Please refer to Figures 1-7The application provides a detachable semitrailer frame for container transportation, which comprises two longitudinal beam solids 1, a cross beam assembly is arranged between the two longitudinal beam solids 1, the cross beam assembly comprises a cross beam body 21, a cross beam backing plate 6 is fixedly arranged on the top of the cross beam body 21, cross beam assembly blocks 31 are fixedly arranged at the two ends of the cross beam body 21, side limiting plates 30 are fixedly arranged on the side of the cross beam assembly blocks 31, cross beam assembly screw holes two 32 are arranged in the cross beam assembly blocks 31, cross beam assembly seats 25 are fixedly arranged on the opposite sides of the two longitudinal beam solids 1, cross beam assembly screw holes one 26 are arranged on the top and the bottom of the inner cavity of the cross beam assembly seat 25, the cross beam assembly blocks 31 are clamped and arranged in the inner cavity of the cross beam assembly seat 25, the specification of the cross beam assembly screw holes two 32 is same with the specification of the cross beam assembly screw holes one 26, assembly bolts 20 are screw-connected in the cross beam assembly screw holes one 26 and the cross beam assembly screw holes two 32, fixing support assemblies for arranging containers are arranged on the opposite sides of the two longitudinal beam solids 1, the fixing support assemblies each comprise a fixed support strip assembly plate one 23 and a fixed support strip assembly plate two 13, one side of the fixed support strip assembly plate one 23 is fixedly connected with one side of the longitudinal beam solid 1, a fixed support strip 10 is fixedly arranged on one side of the fixed support strip assembly plate two 13, a fixed support block 19 is fixedly arranged on the end of the fixed support strip 10 away from the fixed support strip assembly plate two 13, a moving end seat 11 is fixedly arranged on the top of the fixed support block 19, fixed support strip assembly screw holes 22 are arranged in the fixed support strip assembly plate two 13 and the fixed support strip assembly plate one 23, movable support assemblies suitable for different containers are arranged on the opposite sides of the two longitudinal beam solids 1, the movable support assemblies each comprise a movable support strip assembly plate two 14 and a movable support strip assembly plate one 7, one side of the movable support strip assembly plate two 14 is fixedly connected with a connecting assembly, a movable support strip 8 is fixedly arranged on one side of the movable support strip assembly plate one 7, a movable support block 9 is fixedly arranged on the end of the movable support strip 8 away from the movable support strip assembly plate one 7, a fixed end seat 3 and a side mounting seat 18 are fixedly arranged on the top of the movable support block 9, movable support strip assembly screw holes 24 are arranged in the movable support strip assembly plate two 14 and the movable support strip assembly plate one 7, end part mounting screw holes 4 are arranged in the movable end seat 11 and the fixed end seat 3, side part mounting screw holes 5 are arranged in the fixed end seat 3, the movable end seat 11 and the side mounting seat 18, connecting assemblies for adjusting the movable support assemblies are arranged in the two longitudinal beam solids 1, the connecting assemblies each comprise a connecting block 27, connecting rods 28 are fixedly arranged between the two connecting blocks 27, movable sliding blocks 29 are fixedly arranged on one side of the connecting block 27, one side of the movable support strip assembly plate two 14 is fixedly connected with one side of the movable sliding block 29, movable sliding grooves 15 are arranged on the opposite sides of the two longitudinal beam solids 1, the specification size of the inner contour of the movable sliding groove 15 is matched with the specification size of the outer contour of the movable sliding block 29, and the movable sliding block 29 is slidingly arranged in the inner cavity of the movable sliding groove 15,The connecting block 27 is slidingly mounted on the inner side of the reinforcing ring 2.

[0027] The working principle of the above technical scheme is as follows: the longitudinal beam body 1 is welded by four steel plates. When the longitudinal beam body 1 is welded and formed, first, a side plate and a bottom plate are welded together, then a plurality of processing rings 2 are welded on the inner side of the vertical body assembled by the side plate and the bottom plate, and then the other side plate and the top plate are welded on the outer side of the processing ring 2. Welding reinforcement is used throughout the process. First, the beam assembly block 31 at both ends of the beam body 21 is installed in the inside of the beam assembly seat 25 on one side of the longitudinal beam body 1, and then the assembly bolt 20 is screwed into the inside of the beam assembly threaded hole one 26 and the beam assembly threaded hole two 32. After assembly, gap welding is needed between the beam assembly block 31 and the beam assembly seat 25. The bolt and welding are used for double reinforcement to improve the assembly effect between the beam and the longitudinal beam body, thereby forming a complete semitrailer body. The process is completed between the plurality of beam bodies 21 and the two longitudinal beam bodies 1 to form a complete semitrailer body. During the process, it is necessary to ensure that the size of the beam assembly block 31 and the beam assembly seat 25 is completely matched to avoid misalignment or excessive gap, which lays a solid foundation for subsequent fixing operations. The fixed strip assembly plate two 13 and the fixed strip assembly threaded hole 22 are butted together, and then the fixed strip 10 is connected to the longitudinal beam body 1 by cooperating with the fixed strip assembly plate one 23 through external bolts. The movable strip assembly plate one 7 and the movable strip assembly plate two 14 are butted together, and then the movable strip 8 and the longitudinal beam body 1 are assembled together by cooperating with the movable strip assembly threaded hole 24 through external bolts. When in use, the container can be placed on the top of the semitrailer body, and the four corners of the container can be installed in the inside of the two movable end seats 11 and the two fixed end seats 3, and the side of the container can be in contact with the inside of the movable strip 8. The container is fixedly installed on the top of the semitrailer body by cooperating with the end installation threaded hole 4 and the side installation threaded hole 5 through external bolts. This installation method not only operates conveniently and greatly reduces the labor intensity of workers, but also only needs to unscrew the bolts when the container needs to be disassembled and replaced, greatly improving the work efficiency. In addition, the movable slider 29 can slide in the movable sliding groove 15 to adjust the position of the movable strip assembly plate two 14, thereby adjusting the position of the movable strip 8, and adjusting the position of the fixed end seat 3 and the side installation seat 18, so that the semitrailer body can adapt to containers of different length specifications, thereby significantly improving the versatility and use effect of the device, expanding the application range of the device. The reinforcing rings 2 in the longitudinal beam body 1 are made of high-strength material, which can effectively enhance the rigidity of the longitudinal beam body 1, thereby improving the overall rigidity and carrying capacity of the entire semitrailer body. When the semitrailer body bears the weight of the container, the reinforcing rings 2 can disperse part of the stress and reduce the deformation of the longitudinal beam body 1, ensuring that the semitrailer body remains structurally stable during long-term use. At the same time, the connecting block 27 in the longitudinal beam body 1 can slide freely in the reinforcing ring.When the container is placed on the semi-trailer body, the weight of the container is reasonably distributed, the stress of each part of the semi-trailer body is more uniform, the stability and service life of the semi-trailer body are further improved, and the safety of the whole transportation or use process is ensured.

[0028] In another embodiment, as shown in Figures 1-7 The bottom of the cross beam body 21 is fixedly provided with a threading block 16, and the threading block 16 is internally provided with a threading groove 17.

[0029] The threading block 16 and the threading groove 17 can conveniently arrange the wires used in the later stage of the vehicle.

[0030] In another embodiment, as shown in Figures 1-7 The top and bottom of the movable support 8 and the fixed support 10 are fixedly provided with a reinforcing strip 12.

[0031] The reinforcing strip 12 can improve the rigidity of the movable support 8 and the fixed support 10, and reduce the risk of breaking of the movable support 8 and the fixed support 10 when supporting the container.

[0032] Working principle: First, the beam body 21 both ends of the beam assembly block 31 is installed in the two longitudinal beam solid 1 side of the beam assembly seat 25 inside, and then through the assembly bolt 20 is screwed in the beam assembly screw hole one 26 and the beam assembly screw hole two 32 inside, complete a plurality of beam body 21 and two longitudinal beam solid 1 between, constitute complete semitrailer body, in this process, need to ensure that the beam assembly block 31 and the beam assembly seat 25 size completely match, avoid the emergence of misplacement or gap too big, for subsequent fixed work lay a solid foundation, and will be fixed with stick assembly plate two 13 and fixed with stick assembly screw hole 22 butt joint together, then through the external bolt with fixed stick assembly plate one 23 will be fixed with stick 10 and longitudinal beam solid 1 connected together, and will be moved stick assembly plate one 7 and mobile stick assembly plate two 14 butt joint together, complete after the external bolt with mobile stick assembly screw hole 24 will be moved stick 8 and longitudinal beam solid 1 assembled together, use, need to put container on the top of the semitrailer body, can be installed in the four corners of the container in two mobile end seat 11 and two fixed end seat 3 inside, and make the side of the container and the inside of the mobile stick 8 contact, and through the external bolt with end installation screw hole 4 and side installation screw hole 5 will be fixed on the top of the container installation semitrailer body, this kind of installation method not only convenient operation, greatly reduce the labor intensity of workers, and in the subsequent need to disassemble the container replacement, only need to unscrew the bolt, greatly improve the work efficiency, in addition, through the setting of the moving block 29 can slide in the moving slide 15 inside, so as to adjust the position of a plurality of mobile stick assembly plate two 14, realize the position adjustment of a plurality of mobile stick 8, so as to realize the position adjustment of fixed end seat 3 and side installation seat 18, can make the semitrailer body adapt to different length specifications of container, the longitudinal inertia force in transportation will be through a plurality of fixed point in the bottom of the container, apportioned to a plurality of mobile stick 8, rather than concentrated in a single fixed stick 10, stress intensity has been through a plurality of support points apportioned greatly reduced, in addition, when the semitrailer body is put into use, the external locking pin assembly needs to be installed on the outside of the longitudinal beam body 1, which comprises an inner cage, an outer cage, a locking pin and a spring. The inner cage and the outer cage are respectively attached to the inner and outer sides of the slide rail longitudinal beam side wall and fixed by connecting bolts. The spring continuously provides outward thrust to the locking pin. When the slide rail is adjusted to the target position, the locking pin can be inserted into the frame girder through the hole in the cage and the longitudinal beam. The slide rail and the frame are locked, and a limit pin is provided to prevent the locking pin from moving excessively. The device is convenient to disassemble and assemble, can meet the demand of frequent adjustment of the slide rail of the trailer, significantly improves the universality and use effect of the device, expands the application range of the device, and the longitudinal beam solid 1 is provided with reinforcing rings 2. The reinforcing rings 2 are made of high-strength material, which can effectively enhance the rigidity of the longitudinal beam solid 1, thereby improving the overall rigidity and carrying capacity of the entire semitrailer body. When the semitrailer body bears the weight of the container, the reinforcing rings 2 can disperse part of the stress and reduce the deformation of the longitudinal beam solid 1.Ensure that the semitrailer body remains stable in the long-term use process, at the same time, the connecting block 27 inside the longitudinal beam stereo 1 can slide freely inside the reinforcing ring, when the container is placed on the semitrailer body, the weight of the container is reasonably distributed, the force of each part of the semitrailer body is more uniform, the stability and service life of the semitrailer body are further improved, the safety of the whole transportation or use process is guaranteed, the threading block 16 and the threading groove 17 arranged can conveniently arrange the wires used in the later period of the vehicle, the rigidity of the movable support 8 and the fixed support 10 can be improved, and the risk of breaking of the movable support 8 and the fixed support 10 when supporting the container is reduced.

[0033] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A detachable semi-trailer frame for container transportation, comprising two longitudinal beams (1), characterized in that: A crossbeam assembly is installed between the two longitudinal beams (1). Fixed support assemblies for installing containers are installed on opposite sides of the two longitudinal beams (1). Movable support assemblies suitable for different containers are installed on opposite sides of the two longitudinal beams (1). Connecting assemblies for adjusting the movable support assemblies are installed inside the two longitudinal beams (1). Movable slides (15) are provided on opposite sides of the two longitudinal beams (1).

2. The detachable semi-trailer frame for container transportation according to claim 1, characterized in that: The crossbeam assembly includes a crossbeam body (21), a crossbeam pad (6) is fixedly installed on the top of the crossbeam body (21), and crossbeam assembly blocks (31) are fixedly installed at both ends of the crossbeam body (21). A side limiting plate (30) is fixedly installed on one side of each crossbeam assembly block (31).

3. The detachable semi-trailer frame for container transportation according to claim 2, characterized in that: The crossbeam assembly block (31) has a crossbeam assembly threaded hole 2 (32) inside. The two longitudinal beams (1) are fixedly installed on opposite sides. The top and bottom of the crossbeam assembly seat (25) are provided with a crossbeam assembly threaded hole 1 (26). The crossbeam assembly block (31) is snapped into the crossbeam assembly seat (25). The specifications of the crossbeam assembly threaded hole 2 (32) and the crossbeam assembly threaded hole 1 (26) are the same. The crossbeam assembly threaded hole 1 (26) and the crossbeam assembly threaded hole 2 (32) are connected by assembly bolts (20) through internal threads.

4. The detachable semi-trailer frame for container transportation according to claim 3, characterized in that: Each of the crossbeam bodies (21) has a wire threading block (16) fixedly installed at the bottom, and each wire threading block (16) has a wire threading groove (17) inside.

5. A detachable semi-trailer frame for container transportation according to claim 4, characterized in that: The fixed support components all include a fixed support assembly plate one (23) and a fixed support assembly plate two (13). One side of the fixed support assembly plate one (23) is fixedly connected to one side of the longitudinal beam solid (1). A fixed support (10) is fixedly installed on one side of the fixed support assembly plate two (13). A fixed support block (19) is fixedly attached to the drill rod at the end of the fixed support (10) away from the fixed support assembly plate two (13). A movable end seat (11) is fixedly installed on the top of the fixed support block (19). Fixed support assembly threaded holes (22) are opened inside both the fixed support assembly plate two (13) and the fixed support assembly plate one (23).

6. A detachable semi-trailer frame for container transportation according to claim 5, characterized in that: The movable support assembly includes a second movable support assembly plate (14) and a first movable support assembly plate (7). One side of the second movable support assembly plate (14) is fixedly connected to the connecting assembly. A movable support bar (8) is fixedly installed on one side of the first movable support assembly plate (7). A movable support block (9) is fixedly installed at the end of the movable support bar (8) away from the first movable support assembly plate (7). A fixed end seat (3) and a side mounting seat (18) are fixedly installed on the top of the movable support block (9). Movable support bar assembly threaded holes (24) are opened inside both the first movable support assembly plate (7) and the second movable support assembly plate (14).

7. A detachable semi-trailer frame for container transportation according to claim 6, characterized in that: Both the movable end seat (11) and the fixed end seat (3) have end mounting threaded holes (4) inside, and both the fixed end seat (3), the movable end seat (11) and the side mounting seat (18) have side mounting threaded holes (5) inside.

8. A detachable semi-trailer frame for container transportation according to claim 7, characterized in that: The connecting assembly includes a connecting block (27), and a connecting rod (28) is fixedly installed between two adjacent connecting blocks (27). A movable slider (29) is fixedly installed on one side of each connecting block (27). One side of the movable support assembly plate (14) is fixedly connected to one side of the movable slider (29).

9. A detachable semi-trailer frame for container transportation according to claim 8, characterized in that: The top and bottom of the movable support (8) and the fixed support (10) are both fixedly equipped with reinforcing strips (12).

10. A detachable semi-trailer frame for container transportation according to claim 9, characterized in that: The inner contour of the movable slide (15) is adapted to the outer contour of the movable slider (29), and the movable slider (29) is slidably installed inside the movable slide (15). The two longitudinal beam solids (1) are fixedly installed with reinforcing rings (2), and the connecting block (27) is slidably installed inside the reinforcing rings (2).

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