Steel bell and spigot reinforced concrete blow-off pipe

Abstract

The invention provides a steel bell and spigot reinforced concrete blow-off pipe, and belongs to the technical field of reinforced concrete pipes, the steel bell and spigot reinforced concrete blow-off pipe comprises a pipe body, and the outer surface of the pipe body is fixedly connected with a fixing block. According to the reinforced concrete blow-off pipe with the steel bell and spigot, through the arrangement of the pipe body, the rotating block and the dismounting block, after the blow-off pipe is used for a long time, the pipe body needs to be dismounted, maintained or replaced, the outer portion of the pipe body fixes a mounting ring stably and firmly through a fixing block, a motor is mounted on the mounting ring, and the motor is started to drive an assembly on an adjusting block to rotate by 90 degrees; the driving assembly gets close to the pipe body connecting position, then the electric telescopic rod is started to drive the disassembling block to adjust the position length and improve the adaptation degree, then the angle of the disassembling block clamped into the pipe body connecting position can be manually adjusted under driving cooperation of the rotating block, and then the electric telescopic rod continues to push the disassembling block to conduct auxiliary pushing, so that the pipe body is better disassembled conveniently; and manpower is saved, and the disassembly and maintenance efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of reinforced concrete pipes, and in particular relates to a steel socket reinforced concrete sewage pipe. Background Art

[0002] Steel socket reinforced concrete sewer pipe is a type of drainage pipe that combines steel and concrete. It boasts high strength and durability and is widely used in various sewage and drainage projects. The following is a detailed introduction to steel socket reinforced concrete sewer pipes: The main features of steel socket reinforced concrete sewer pipes include: High Strength: Combining the tensile strength of steel and the compressive strength of concrete, it forms a stable structure capable of withstanding significant external pressure, ensuring the safe operation of the drainage system; Good Durability: The reinforced concrete material is resistant to various chemical corrosion and the effects of the natural environment, extending the service life of the pipe; Easy Installation: The socket design makes the pipe installation process simpler and faster, improving construction efficiency; Low Maintenance Cost: Due to its excellent durability and stability, maintenance costs are relatively low, reducing the overall operating costs of urban drainage systems. This type of pipe is primarily used in urban drainage systems, including rainwater discharge and sewage treatment. Its strong drainage capacity ensures that urban drainage systems can continue to operate stably even in adverse weather conditions, effectively preventing urban waterlogging.

[0003] Socket-and-socket reinforced concrete sewer pipes are a common type of sewer pipe. Steel socket-and-socket reinforced concrete sewer pipes offer better resistance to foundation deformation and leakage, making them suitable for long-distance and curved jacking construction. They also have a long service life. However, after prolonged use, sewer pipes can become damaged and leak, requiring disassembly, repair, or replacement. Manual disassembly requires a significant amount of labor, which wastes manpower. Therefore, a structure that can assist with disassembly is needed to improve the efficiency of sewer pipe replacement and maintenance and conserve human resources. Therefore, the development of a steel socket-and-socket reinforced concrete sewer pipe is crucial. Summary of the Invention

[0004] The purpose of the present invention is to provide a steel socket reinforced concrete sewage pipe, which aims to solve the problem in the prior art that sewage pipes will be damaged and leak after long-term use, and need to be disassembled, repaired or replaced. However, manual disassembly requires a large amount of labor to assist in disassembly, which wastes manpower. A structure that can assist in disassembly is needed to improve the efficiency of sewage pipe replacement and maintenance and save human resources.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a steel socket reinforced concrete sewage pipe, comprising a pipe body, the outer surface of the pipe body is fixedly connected to a fixing block, the outer surface of the fixing block is fixedly connected to a mounting ring, the front and rear outer surfaces of the mounting ring are symmetrically provided with mounting blocks, the outer surface of the mounting block is mounted with a motor, the output end of the motor is fixedly connected to an adjusting block, the outer surface of the adjusting block is fixedly connected to an electric telescopic rod, one end of the electric telescopic rod is rotatably connected to a rotating block, and the outer surface of the rotating block is fixedly connected to a disassembly block.

[0006] In order to enable this steel socket reinforced concrete sewage pipe to achieve the purpose of completing the structural support and mixing of the pipe body by mixing concrete with small steel rings and large steel rings to improve the hardness of the sewage pipe, as a preferred embodiment of the present invention, a small steel ring is provided in the middle part of the inner part of the pipe body, and a large steel ring is provided in the middle part of the outer part of the pipe body.

[0007] In order to enable this steel socket reinforced concrete sewage pipe to achieve the purpose of firmly fixing the positions of the small steel bar ring and the large steel bar ring body with the cooperation of the fixed steel bars and the supporting steel bars to connect and support the two to avoid deformation, as a preferred embodiment of the present invention, the outer surfaces of the small steel bar ring and the large steel bar ring are fixedly connected with fixed steel bars, and the outer surfaces of the fixed steel bars are fixedly connected with supporting steel bars.

[0008] In order to make it convenient for the steel socket reinforced concrete sewage pipe to connect the socket with the help of the connecting block to realize the combined use of the sewage pipe and facilitate assembly operation, as a preferred embodiment of the present invention, a socket is provided at one end of the pipe body, and a connecting block is provided at the other end of the pipe body, and a socket is provided on the outer surface of the connecting block.

[0009] In order to facilitate the close combination of the socket and the steel socket reinforced concrete sewage pipe and improve the adaptability, as a preferred embodiment of the present invention, the size of the connecting block is larger than the size of the pipe body, and the inner diameter of the socket is adapted to the outer diameter of the socket.

[0010] In order to facilitate the installation of this steel socket reinforced concrete sewage pipe, stabilize the sealing ring, and protect the sealing of the connection between the socket and the socket by the sealing ring to avoid leakage and improve safety, as a preferred embodiment of the present invention, the socket is provided with a groove near the inner wall of the pipe body, and the inner wall of the groove is clamped with a sealing ring.

[0011] In order to enable this steel socket reinforced concrete sewage pipe to achieve the purpose of external auxiliary fixation with the help of auxiliary blocks in conjunction with thread grooves and other components to avoid loosening caused by long-term use and improve stability, as a preferred embodiment of the present invention, the outer surface of the pipe body near the socket is fixedly connected with an auxiliary block, and the outer surfaces of the auxiliary block and the connecting block are provided with thread grooves. There are four thread grooves, and the four thread grooves are arranged in the form of a ring array.

[0012] In order to enable this steel socket reinforced concrete sewage pipe to achieve the purpose of external auxiliary connection and fixation with the help of screws, and also to facilitate rotation and disassembly for maintenance and inspection and facilitate operation, as a preferred embodiment of the present invention, the threaded groove is rotatably connected with a screw near the inner wall of the auxiliary block.

[0013] In order to enable the steel socket reinforced concrete sewage pipe to achieve the purpose of aligning, connecting and fixing the pipe bodies under the alignment of the positioning columns to assist in determining the correct positions of the remaining components outside the pipe body and facilitate better cooperation, as a preferred embodiment of the present invention, the auxiliary block is fixedly connected with a positioning column near the outer surface of the connecting block, and the number of the positioning columns is four, and the four positioning columns are arrayed in the form of a ring array.

[0014] In order to enable the steel socket reinforced concrete sewage pipe to achieve the purpose of inserting the positioning column into the positioning hole for positioning, facilitating subsequent auxiliary connection and fixation to improve safety, as a preferred embodiment of the present invention, the connecting block is provided with a positioning hole near the outer surface of the auxiliary block, and the position and size of the positioning hole are adapted to the position and size of the positioning column.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The steel socket reinforced concrete sewage pipe is provided with a pipe body, a fixed block, a mounting ring, a mounting block, a motor, an adjusting block, an electric telescopic rod, a rotating block and a disassembly block. After long-term use, the sewage pipe needs to be disassembled, repaired or replaced for the pipe body. At this time, the outside of the pipe body is fixed with a fixed block to ensure the stability and firmness of the mounting ring. A motor can be installed on the mounting ring. The motor is started to drive the components on the adjusting block to rotate ninety degrees, driving the components close to the connection of the pipe body. Then, the electric telescopic rod is started to drive the disassembly block to adjust the position and length to improve the adaptability. Then, with the cooperation of the rotating block, the angle of the disassembly block to enter the pipe body connection can be manually adjusted. Then, the electric telescopic rod continues to push the disassembly block for auxiliary pushing, which facilitates and better disassembly of the pipe body, saves manpower requirements, and improves disassembly and maintenance efficiency.

[0017] 2. The steel socket reinforced concrete sewage pipe is provided with small steel rings, small steel rings, shaping steel bars and supporting steel bars. The small steel rings provide shaping support on the inside of the pipe body, and the large steel rings provide shaping support on the outside of the pipe body, so as to avoid the problem that deformation of the pipe body during the manufacturing process affects the later use. The position spacing between the small steel rings and the large steel rings can also be adjusted to adjust the thickness of the pipe body, thereby improving the flexibility and adaptability of sewage pipe manufacturing. With the structural support of the small steel rings and the large steel rings, they can be mixed and combined with concrete to realize the production of the pipe body. At the same time, the small steel rings and the large steel rings can strengthen the firmness of the pipe body and improve the service life of the pipe body. The shaping steel bars can fix the small steel rings and the large steel rings to avoid displacement of the shapes of the small steel rings and the large steel rings. The supporting steel bars can fix and support the spacing between the small steel rings and the large steel rings, thereby improving support and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 Schematic diagram of the sealing ring structure of the present invention;

[0021] Figure 3 Schematic diagram of the positioning column structure in the present invention;

[0022] Figure 4 Schematic diagram of the structure of the small steel bar ring and the large steel bar ring in the present invention;

[0023] Figure 5 Schematic diagram of the mounting ring structure in the present invention;

[0024] Figure 6 It is a schematic diagram of the top view structure of the present invention;

[0025] Figure 7 It is a schematic diagram of the side sectional structure of the main body in the present invention.

[0026] In the figure: 1. Tube body; 2. Fixing block; 3. Mounting ring; 4. Mounting block; 5. Motor; 6. Adjusting block; 7. Electric telescopic rod; 8. Rotating block; 9. Disassembly block; 10. Small steel ring; 11. Large steel ring; 12. Shaped steel bar; 13. Support steel bar; 14. Socket; 15. Connecting block; 16. Socket; 17. Slot; 18. Sealing ring; 19. Auxiliary block; 20. Threaded groove; 21. Screw; 22. Positioning column; 23. Positioning hole. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example

[0029] See also Figure 1-7 The present invention provides the following technical solution: a steel socket reinforced concrete sewage pipe, comprising a pipe body 1, a fixed block 2 is fixedly connected to the outer surface of the pipe body 1, a mounting ring 3 is fixedly connected to the outer surface of the fixed block 2, mounting blocks 4 are symmetrically provided on the front and rear outer surfaces of the mounting ring 3, a motor 5 is installed on the outer surface of the mounting block 4, an adjusting block 6 is fixedly connected to the output end of the motor 5, an electric telescopic rod 7 is fixedly connected to the outer surface of the adjusting block 6, one end of the electric telescopic rod 7 is rotatably connected to a rotating block 8, and a disassembly block 9 is fixedly connected to the outer surface of the rotating block 8.

[0030] In a specific embodiment of the present invention, after the sewage pipe has been used for a long time, the pipe body 1 needs to be disassembled, repaired or replaced. At this time, the outside of the pipe body 1 is fixed with the fixing block 2 to stabilize the mounting ring 3. The mounting block 4 on the mounting ring 3 can be installed with a motor 5. The motor 5 is started to drive the component on the adjustment block 6 to rotate ninety degrees, driving the component close to the connection of the pipe body 1, and then the electric telescopic rod 7 is started to drive the disassembly block 9 to adjust the position and length to improve the adaptability. Then, with the cooperation of the rotating block 8, the angle of the disassembly block 9 to be stuck into the connection of the pipe body 1 can be manually adjusted, and then the electric telescopic rod 7 continues to push the disassembly block 9 for auxiliary pushing, which facilitates and better disassembly of the pipe body 1, saves manpower requirements, and improves disassembly and maintenance efficiency.

[0031] Specifically, a small steel ring 10 is provided in the middle of the inner portion of the tube body 1 , and a large steel ring 11 is provided in the middle of the outer portion of the tube body 1 .

[0032] In this embodiment: the small steel ring 10 is used to shape the inner side of the pipe body 1, and the large steel ring 11 is used to shape the outer side of the pipe body 1, so as to avoid the problem of deformation of the pipe body 1 during the manufacturing process affecting its later use. The position spacing between the small steel ring 10 and the large steel ring 11 can also be adjusted to adjust the thickness of the pipe body 1, thereby improving the flexibility and adaptability of sewage pipe manufacturing. With the structural support of the small steel ring 10 and the large steel ring 11, they can be mixed and combined with concrete to realize the production of the pipe body 1. At the same time, the small steel ring 10 and the large steel ring 11 can strengthen the firmness of the pipe body 1 and improve the service life of the pipe body 1.

[0033] Specifically, the outer surfaces of the small steel bar ring 10 and the large steel bar ring 11 are fixedly connected with the shaped steel bars 12 , and the outer surfaces of the shaped steel bars 12 are fixedly connected with the supporting steel bars 13 .

[0034] In this embodiment: the shaped steel bars 12 can fix the small steel bar ring 10 and the large steel bar ring 11 to prevent the shapes of the small steel bar ring 10 and the large steel bar ring 11 from being displaced, and the supporting steel bars 13 can fix and support the distance between the small steel bar ring 10 and the large steel bar ring 11 to improve support and safety.

[0035] Specifically, a socket 14 is provided at one end of the pipe body 1 , a connecting block 15 is provided at the other end of the pipe body 1 , and a socket 16 is provided on the outer surface of the connecting block 15 .

[0036] In this embodiment: the connecting block 15 at one end of the pipe body 1 can assist in the combined connection of the two ends of the pipe body 1, clean the outside of the socket 14 and the inside of the bell 16, and apply a layer of oil after cleaning, so as to facilitate the connection and combination of the socket 14 and the bell 16, and complete the combined use of the entire sewage pipe, which is simple to operate and the combination is complete and tight.

[0037] Specifically, the size of the connecting block 15 is larger than that of the pipe body 1 , and the inner diameter of the socket 16 is adapted to the outer diameter of the insert 14 .

[0038] In this embodiment, the size of the connecting block 15 is larger than that of the pipe body 1, so that the socket 16 can better accommodate the socket 14 at the other end of the pipe body 1, thereby facilitating operation.

[0039] Specifically, a clamping groove 17 is formed on the inner side wall of the socket 16 close to the pipe body 1 , and a sealing ring 18 is clamped on the inner side wall of the clamping groove 17 .

[0040] In this embodiment: the card groove 17 can better install and fix the sealing ring 18, prevent the sealing ring 18 from loosening, ensure the stability and firmness of the sealing ring 18, and the sealing ring 18 can protect the sealing of the connection between the socket 14 and the socket 16 of the pipe body 1, and prevent liquid leakage from affecting the normal use of the sewage pipe.

[0041] Specifically, an auxiliary block 19 is fixedly connected to the outer surface of the tube body 1 near the socket 14. The outer surfaces of the auxiliary block 19 and the connecting block 15 are both provided with thread grooves 20. There are four thread grooves 20, and the four thread grooves 20 are arrayed in the form of a ring array.

[0042] In this embodiment: after the pipe body 1 is fixed by connecting the socket 16 and the plug 14, the threaded grooves 20 on the auxiliary block 19 and the connecting block 15 can be used in conjunction with some other components for external auxiliary fixation to improve the stability and firmness of the connection of the pipe body 1 and ensure safety.

[0043] Specifically, the threaded groove 20 is rotatably connected to the inner wall of the auxiliary block 19 with a screw 21 .

[0044] In this embodiment, the screw 21 can cooperate with the thread groove 20 to perform auxiliary connection and fixation at the auxiliary block 19 and the connecting block 15 on the pipe body 1, which is convenient for disassembly and fixation, simple to operate, and easy to construct.

[0045] Specifically, the auxiliary block 19 is fixedly connected to the outer surface of the connection block 15 with positioning posts 22 . There are four positioning posts 22 , and the four positioning posts 22 are arranged in a ring array.

[0046] In this embodiment, the positioning posts 22 on the auxiliary block 19 can cooperate with some components to locate and fix the position. The four positioning posts 22 can assist in aligning and fixing the position of the tube body 1 when it is connected. While assisting in positioning, they can also help to perform certain fixation.

[0047] Specifically, a positioning hole 23 is formed on the outer surface of the connecting block 15 close to the auxiliary block 19 , and the position and size of the positioning hole 23 match the position and size of the positioning post 22 .

[0048] In this embodiment, the positioning holes 23 can cooperate with the positioning posts 22 to locate and fix the position, ensuring the accuracy of the position of the components on the outer surface of the tube body 1, and facilitating unimpeded operation during subsequent maintenance or disassembly.

[0049] The electrical components mentioned in this article are all connected to an external main controller and 220V AC power, and the main controller can be a conventional known device that performs control such as a computer.

[0050] The working principle and use process of the present invention: When the steel socket reinforced concrete sewage pipe is in use, the sewage pipe needs to be disassembled, repaired or replaced after long-term use. At this time, the outside of the pipe body 1 is fixed with the fixing block 2 to stabilize the mounting ring 3. The mounting block 4 on the mounting ring 3 can be installed with a motor 5. The motor 5 is started to drive the component on the adjustment block 6 to rotate ninety degrees, driving the component close to the connection of the pipe body 1, and then the electric telescopic rod 7 is started to drive the disassembly block 9 to adjust the position and length to improve the adaptability. Then, under the driving cooperation of the rotating block 8, the angle of the disassembly block 9 to be stuck into the pipe body 1 can be manually adjusted, and then the electric telescopic rod 7 continues to push the disassembly block 9 to perform auxiliary pushing, which is convenient and better for disassembling the pipe body 1 and saves money. The demand for manpower is improved, the efficiency of disassembly and maintenance is improved, the small steel ring 10 is used to shape the inner side of the pipe body 1, and the large steel ring 11 is used to shape the outer side of the pipe body 1 to avoid the problem of deformation of the pipe body 1 during the manufacturing process affecting the later use, and the position spacing between the small steel ring 10 and the large steel ring 11 can be adjusted to achieve the adjustment of the thickness of the pipe body 1, thereby improving the flexibility and adaptability of sewage pipe manufacturing. With the structural support of the small steel ring 10 and the large steel ring 11, they can be mixed and combined with concrete to realize the production of the pipe body 1. At the same time, the small steel ring 10 and the large steel ring 11 can strengthen the firmness of the pipe body 1 and improve the service life of the pipe body 1. The shaped steel bar 12 can fix the small steel ring 10 and the large steel ring 11 to avoid the small steel ring The shapes of 10 and the large steel ring 11 are displaced, and the supporting steel bar 13 can fix and support the distance between the small steel ring 10 and the large steel ring 11, thereby improving the support and safety. The connecting block 15 at one end of the pipe body 1 can assist in the combined connection of the pipe bodies 1 at both ends, clean the outside of the socket 14 and the inside of the socket 16, and apply a layer of oil after cleaning to facilitate the connection and combination of the socket 14 and the socket 16 to complete the combined use of the entire sewage pipe. The operation is simple, the combination is complete and tight, and the size of the connecting block 15 is larger than the size of the pipe body 1, which can facilitate the socket 16 to better accommodate the socket 14 at the end of the pipe body 1, and is easy to operate. The card groove 17 can better install and fix the sealing ring 18 to prevent the sealing ring 18 from loosening and ensure the stability and firmness of the sealing ring 18. , the sealing ring 18 can protect the sealing of the connection between the socket 14 and the socket 16 of the pipe body 1, and prevent liquid leakage from affecting the normal use of the sewage pipe. After the pipe body 1 is fixed to the socket 14 through the socket 16, the threaded grooves 20 on the auxiliary block 19 and the connecting block 15 can be used in conjunction with some other components for external auxiliary fixation to improve the stability and firmness of the connection of the pipe body 1 and ensure safety. The screws 21 can cooperate with the threaded grooves 20 to perform auxiliary connection and fixation at the auxiliary block 19 and the connecting block 15 on the pipe body 1, which is convenient for disassembly and fixation, simple operation, and easy to construct. The positioning posts 22 on the auxiliary block 19 can cooperate with some components to locate and fix the position. The four positioning posts 22 can assist in the alignment and fixation of the position of the pipe body 1 when it is connected.While assisting in positioning, it can also help to fix the pipe to a certain extent. The positioning hole 23 can cooperate with the positioning column 22 to position and fix the position, ensuring the accuracy of the position of the components on the outer surface of the pipe body 1, and facilitating unobstructed operation during subsequent maintenance or disassembly.

[0051] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A steel socket reinforced concrete sewage pipe, comprising a pipe body (1), characterized in that: The outer surface of the tube body (1) is fixedly connected to a fixing block (2), the outer surface of the fixing block (2) is fixedly connected to a mounting ring (3), the front and rear outer surfaces of the mounting ring (3) are symmetrically provided with mounting blocks (4), the outer surface of the mounting block (4) is mounted with a motor (5), the output end of the motor (5) is fixedly connected to an adjustment block (6), the outer surface of the adjustment block (6) is fixedly connected to an electric telescopic rod (7), one end of the electric telescopic rod (7) is rotatably connected to a rotating block (8), and the outer surface of the rotating block (8) is fixedly connected to a disassembly block (9).

2. A steel socket reinforced concrete sewage pipe according to claim 1, characterized in that: A small steel bar ring (10) is arranged in the inner middle part of the tube body (1), and a large steel bar ring (11) is arranged in the outer middle part of the tube body (1).

3. A steel socket reinforced concrete sewage pipe according to claim 2, characterized in that: The outer surfaces of the small steel bar ring (10) and the large steel bar ring (11) are both fixedly connected with shaped steel bars (12), and the outer surfaces of the shaped steel bars (12) are fixedly connected with supporting steel bars (13).

4. A steel socket reinforced concrete sewage pipe according to claim 1, characterized in that: One end of the tube body (1) is provided with a socket (14), the other end of the tube body (1) is provided with a connection block (15), and the outer surface of the connection block (15) is provided with a socket (16).

5. A steel socket reinforced concrete sewage pipe according to claim 4, characterized in that: The size of the connection block (15) is larger than the size of the pipe body (1), and the inner diameter of the socket (16) is matched with the outer diameter of the plug (14).

6. A steel socket reinforced concrete sewage pipe according to claim 4, characterized in that: The inner side wall of the socket (16) close to the pipe body (1) is provided with a clamping groove (17), and the inner side wall of the clamping groove (17) is clamped with a sealing ring (18).

7. The steel socket reinforced concrete sewage pipe according to claim 1, characterized in that: An auxiliary block (19) is fixedly connected to the outer surface of the tube body (1) near the socket (14), and the outer surfaces of the auxiliary block (19) and the connecting block (15) are both provided with thread grooves (20). There are four thread grooves (20), and the four thread grooves (20) are arranged in a circular array.

8. A steel socket reinforced concrete sewage pipe according to claim 7, characterized in that: The thread groove (20) is rotatably connected with a screw (21) near the inner side wall of the auxiliary block (19).

9. The steel socket reinforced concrete sewage pipe according to claim 7, characterized in that: The auxiliary block (19) is fixedly connected with a positioning column (22) near the outer surface of the connecting block (15). There are four positioning columns (22), and the four positioning columns (22) are arranged in a ring array.

10. A steel socket reinforced concrete sewage pipe according to claim 9, characterized in that: A positioning hole (23) is provided on the outer surface of the connection block (15) close to the auxiliary block (19), and the position and size of the positioning hole (23) are matched with the position and size of the positioning column (22).

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