A rectangular pipe-jacking pipe joint connection device with a positioning structure

Abstract

The present invention provides a rectangular top pipe joint connection device with a positioning structure, which relates to the technical field of rectangular pipe joint connection, including: a connector body, a positioning cover is installed at the edge position of the side surface of the connector body, and four guide grooves are provided on the side surface of the connector body; a pipe body is installed on the side surface of the connector body; a collection box is installed on the top of the second installation template; a driving pump is installed on the side surface of the collection box, and a guide pipe is installed on the output end of the driving pump; an air suction hood is installed on the side end of the guide pipe, wherein the bottom of the air suction hood is provided with an air suction groove. The driving pump, the guide pipe and the air suction hood can actively absorb and clean the mud on the advancement path of the pipe joint when the pipe joint is docked, effectively avoiding the problem of gaps in the joints caused by residual mud, improving the sealing of the rectangular pipe joint connection, and solving the problem that mud mixed in the joints will be squeezed to form lumps, resulting in large gaps between the pipe joints.

Description

Technical Field

[0001] The invention relates to the technical field of rectangular pipe segment connection, in particular to a rectangular jacking pipe segment connection device with a positioning structure. Background Art

[0002] Rectangular pipe jacking uses a pipe jacking machine with a rectangular cross-section for excavation, which can make more efficient use of underground space and meet the special requirements for spatial shape and size in the development of water-rich soft strata. During the excavation process, rectangular pipe jacking requires the use of connecting devices to connect multiple pipe sections to ensure the sealing between the rectangular pipe jacking sections.

[0003] In the existing rectangular jacking pipe segment connection process, the pipe segment is connected to the adjacent pipe segment end under the push of the excavation system. During the movement of the pipe segment, the soil in contact with the inner wall of the excavation channel may be peeled off. Under the action of gravity, the soil will fall to the bottom of the pipe segment. As the pipe segments gradually butt together, the soil mixed in the joints will be squeezed to form lumps, resulting in larger gaps between the pipe segments, which seriously weakens the sealing performance of the connection parts. Summary of the Invention

[0004] The present invention relates to a rectangular jacking pipe segment connection device with a positioning structure, so as to solve the problem that soil may peel off from the inner wall of the excavation channel during the movement of the pipe segment. Under the action of gravity, the soil will fall to the bottom of the pipe segment. As the pipe segments are gradually butted together, the soil mixed in the joints will be squeezed to form lumps, resulting in large gaps between the pipe segments and seriously weakening the sealing performance of the connection parts.

[0005] The present invention provides a rectangular top pipe section connection device with a positioning structure, which specifically includes: a connecting member main body, the connecting member main body is a rectangular frame structure, and a positioning cover is installed at the edge position of the side surface of the connecting member main body, and four guide slide grooves are provided on the side surface of the connecting member main body; a pipe body is installed on the side surface of the connecting member main body; a positioning groove is provided at the side end of the pipe body, and the side end of the pipe body is on the inner side of the positioning cover; an installation template 1 and an installation template 2 are installed on the inner bottom of the connecting member main body by fixing bolts; a collecting box is installed on the top of the installation template 2; a driving pump is installed on the side of the collecting box, and a guide pipe is installed on the output end of the driving pump; the guide pipe is made of flexible material, and an air suction hood is installed on the side end of the guide pipe, wherein an air suction groove is provided on the bottom of the air suction hood; a connecting support plate 1 is rotatably installed on the top of the installing template 1; a concentrating plate is rotatably installed on the side end of the connecting support plate 1; a traction rope is installed on the bottom of the concentrating plate; the bottom of the traction rope is connected to the top of the air suction hood.

[0006] Furthermore, the guide chute is a T-shaped structure, a positioning block is installed in the middle position of the guide chute, and a guide slide plate is slidably installed inside the guide chute.

[0007] Further, a guide wheel is rotatably installed on the side of the guide slide plate; the guide wheel is rotatably installed inside the guide chute.

[0008] Further, a spring is installed on the side of the guide slide plate, and the side of the guide slide plate is connected to the side of the positioning block through the spring; an elastic positioning plate is rotatably installed at the outer end of the guide slide plate; the elastic positioning plate is made of metal sheet material, and the middle position of the elastic positioning plate is inside the positioning groove.

[0009] Further, six fixing rods are installed on the other side of the connecting piece body; a plurality of positioning holes are evenly distributed on the outer side of the fixing rods.

[0010] Further, a rotating rod is rotatably installed inside the fixing rod; the outer ends of four of the rotating rods penetrate through the side of the connecting piece body and are provided with driving handles, and the outer ends of two rotating rods penetrate through the side of the connecting piece body and the positioning block.

[0011] Further, a movable plate is installed on the outer side of the rotating rod; a support plate is installed on the outer side of the movable plate through a rotating shaft; the side end of the support plate is rotatably installed inside the stabilizing plate.

[0012] Further, the stabilizing plate is of an arc-shaped structure, the upper and lower stabilizing plates are closed together, and a fixing cone is installed on the outer side of the stabilizing plate; the outer end of the fixing cone is slidably installed inside the positioning hole.

[0013] Further, a spring is installed on the outer side of the first connecting support plate, and the outer side of the first connecting support plate is connected to the top of the first installation template through the spring; a second connecting support plate is rotatably installed on the side of the centralized plate.

[0014] Further, the side of the second connecting support plate is connected to the side of the first connecting support plate through a spring, and a stress plate is rotatably installed at the bottom of the second connecting support plate; the stress plate is of an L-shaped structure, and a connecting plate is installed between the two stress plates.

[0015] The present invention provides a rectangular pipe jacking pipe joint connection device with a positioning structure, which has the following beneficial effects:

[0016] When the present invention is in use, through the driving pump, the diversion pipe and the suction hood, the soil on the pipe joint propulsion path can be actively adsorbed and cleaned during the pipe joint docking, effectively avoiding the problem of gaps in the joint caused by soil residue, improving the connection tightness of the rectangular pipe joint, reducing the leakage risk, and the suction hood can be displaced and avoided after the soil collection is completed, without interfering with the normal installation of the pipe joint. The modular design of the first installation template and the second installation template is convenient for disassembly and reuse, not only reducing material waste, but also reducing the construction cost, greatly improving the tightness and construction quality of the rectangular pipe jacking pipe joint connection, and providing a strong guarantee for the safety and reliability of the construction in the water-rich soft stratum.

[0017] In addition, the rectangular pipe section is positioned by the cooperation of the positioning groove and the elastic positioning plate. During the pushing process, the rectangular pipe section can move forward horizontally, ensuring the accuracy of the connection direction. This not only improves the installation efficiency of the rectangular pipe jacking pipe section but also enhances the stability of the connection structure.

[0018] During the prefabrication stage of the rectangular pipe section, the fixing rod is directly inserted into the rectangular pipe section, and the main body of the connecting piece is located at one end of the rectangular pipe section. In the subsequent construction process, there is no need to perform additional preliminary positioning and installation operations of the main body of the connecting piece and the rectangular pipe section at the construction site, saving a large amount of construction time and labor costs, effectively improving the overall construction efficiency, and is especially suitable for rectangular pipe jacking projects with strict construction period requirements.

[0019] After the concrete of the rectangular pipe section solidifies, the fixing cone at the outer end of the stabilizing plate is inserted into the interior of the rectangular pipe section by rotating the rotating rod, effectively reinforcing the position of the fixing rod, greatly enhancing the connection strength between the fixing rod and the rectangular pipe section, effectively avoiding the problem of the fixing rod loosening and falling off due to factors such as vibration and collision during transportation and handling, ensuring the stability of the connection between the main body of the connecting piece and the rectangular pipe section, reducing the potential safety hazards caused by loose connections. A stable connection can ensure that during the hoisting and subsequent use of the rectangular pipe jacking, the connections between the pipe sections are tight and reliable, and problems such as pipe section misalignment and leakage caused by loosening of the connecting pieces will not occur, thus guaranteeing the quality and safety of the rectangular pipe jacking project and extending the service life of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0021] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0022] In the drawings:

[0023] Figure 1 A schematic diagram showing the overall structure of the present invention is shown;

[0024] Figure 2 A schematic cross-sectional structure diagram of the main body of the connecting piece of the present invention is shown;

[0025] Figure 3 A schematic three-dimensional structure diagram of the elastic positioning plate of the present invention is shown;

[0026] Figure 4 A schematic three-dimensional structure diagram of the fixing rod of the present invention is shown;

[0027] Figure 5 A schematic three-dimensional structure diagram of the rotating rod of the present invention is shown;

[0028] Figure 6 shows a schematic cross-sectional structure diagram of the stabilizing plate of the present invention;

[0029] Figure 7 shows a schematic cross-sectional structure diagram of the collection hood of the present invention;

[0030] Figure 8 shows a schematic three-dimensional structure diagram of the concentrating plate of the present invention;

[0031] Figure 9 shows a schematic three-dimensional structure diagram of the force-bearing plate of the present invention.

[0032] List of reference numerals

[0033] 1. Connector body; 101. Positioning cover; 102. Guide chute; 103. Positioning block; 104. Guide slide plate; 105. Guide wheel; 106. Elastic positioning plate;

[0034] 2. Fixed rod; 201. Positioning hole; 202. Rotating rod; 203. Movable plate; 204. Support plate; 205. Stabilizing plate; 206. Fixed cone;

[0035] 3. Mounting template one; 301. Mounting template two; 302. Collection box; 303. Diversion pipe; 304. Suction hood; 305. Suction groove; 306. Connecting support plate one; 307. Concentrating plate; 308. Towing rope; 309. Connecting support plate two; 3010. Force-bearing plate; 3011. Connecting plate;

[0036] 4. Pipe body; 401. Positioning groove. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0038] Please refer to Figures 1 to 9 :

[0039] Embodiment 1: The present invention provides a rectangular pipe jacking pipe joint connection device with a positioning structure, including: a connector main body 1, the connector main body 1 is a rectangular frame structure, and a positioning cover 101 is installed at the edge position of the side surface of the connector main body 1, and there are four guiding sliding grooves 102 on the side surface of the connector main body 1; a pipe body 4 is installed on the side surface of the connector main body 1; a positioning groove 401 is provided at the side end of the pipe body 4, and the side end of the pipe body 4 is inside the positioning cover 101; the guiding sliding groove 102 is a T-shaped structure, and a positioning block 103 is installed at the middle position of the guiding sliding groove 102, and a guiding sliding plate 104 is slidably installed inside the guiding sliding groove 102; a guiding wheel 105 is rotatably installed on the side surface of the guiding sliding plate 104; the guiding wheel 105 is rotatably installed inside the guiding sliding groove 102; a spring is installed on the side surface of the guiding sliding plate 104, and the side surface of the guiding sliding plate 104 is connected to the side surface of the positioning block 103 through the spring; an elastic positioning plate 106 is rotatably installed at the outer end of the guiding sliding plate 104; the elastic positioning plate 106 is made of metal sheet material, and the middle position of the elastic positioning plate 106 is inside the positioning groove 401.

[0040] In the embodiment of the present invention, during the connection of the rectangular pipe jacking pipe joints, the openings on the pipe body 4 are used as reserved positions for subsequent cable pipelines. When the subsequent rectangular pipe jacking moves to the side of the connector main body 1, the positioning cover 101 seals the outside of the connection part of the rectangular pipe jacking. There is a groove on the side end face of the rectangular pipe jacking, that is, the positioning groove 401 on the pipe body 4. The connector main body 1 has been fixed in position with the previously installed rectangular pipe jacking pipe joints. When the subsequent rectangular pipe jacking is connected, as the pipe joint 4 approaches the connector main body 1, the bulging part in the middle of the elastic positioning plate 106 is inserted into the positioning groove 401 first. The elastic positioning plates 106 at different positions position the movement of the pipe body 4. As the rectangular pipe jacking pushes the elastic positioning plate 106 to move, the elastic positioning plate 106 is inside the positioning groove 401 at the side end of the pipe body 4. When the pipe body 4 continues to move, it pushes both ends of the elastic positioning plate 106 to drive the guiding sliding plate 104 to move along the guiding sliding groove 102. The guiding wheel 105 reduces the friction of the movement of the guiding sliding plate 104, so that the elastic positioning plate 106 is outside the guiding sliding groove 102, positions the pipe body 4 that moves the elastic positioning plate 106, ensures that the pipe body 4 moves vertically forward for connection, reduces the large-scale movement of the pipe body 4 before it is installed in the positioning cover 101, and quickly and stably installs the side end of the lead pipe body 4 inside the positioning cover 101.

[0041] Embodiment 2. On the basis of Embodiment 1, six fixing rods 2 are installed on the other side of the connecting piece main body 1; a plurality of uniformly distributed positioning holes 201 are provided on the outer side of the fixing rod 2; a rotating rod 202 is rotatably installed inside the fixing rod 2; the outer ends of four rotating rods 202 penetrate through the side of the connecting piece main body 1 and are provided with driving handles, and the outer ends of two rotating rods 202 penetrate through the side of the connecting piece main body 1 and the positioning block 103; a movable plate 203 is installed on the outer side of the rotating rod 202; a support plate 204 is installed on the outer side of the movable plate 203 through a rotating shaft; the side end of the support plate 204 is rotatably installed inside the stabilizing plate 205; the stabilizing plate 205 is of an arc-shaped structure, and the upper and lower stabilizing plates 205 are closed together, and a fixing cone 206 is installed on the outer side of the stabilizing plate 205; the outer end of the fixing cone 206 is slidably installed inside the positioning hole 201. During the connection process of the rectangular jacking pipe section, in the prefabrication stage of the rectangular pipe section, when the concrete of the rectangular pipe section has not solidified, the fixing rod 2 is directly inserted into the rectangular pipe section, so that the connecting piece main body 1 is located at one end of the rectangular pipe section. As the concrete of the rectangular pipe section solidifies, the solidified concrete can ensure the stability of the connection of the fixing rod 2. Rotate the outer ends of the rotating rods 202 on the side of the connecting piece main body 1 and the side of the positioning block 103. The threads on the side of the rotating rod 202 drive the movable plate 203 to move. The side of the movable plate 203 drives the two support plates 204 to move simultaneously. The side end of the support plate 204 pushes the stabilizing plate 205 to move outwards. The fixing cone 206 at the outer end of the stabilizing plate 205 moves outwards through the positioning hole 201 and is inserted into the inside of the rectangular pipe section, further increasing the friction force at the position where the fixing rod 2 is located and increasing the stability of the position of the fixing rod 2, so that the connecting piece main body 1 and the pipe body 4 are connected into a whole, preventing loosening and falling off during transportation and handling, ensuring the stability of the connection between the connecting piece main body 1 and the rectangular pipe section. After the connecting piece main body 1 is installed at one end of the rectangular jacking pipe through the fixing rod 2, it is hoisted into the pipeline through the pipeline well along with the rectangular jacking pipe and moves together with the rectangular jacking pipe, facilitating connection with the rectangular jacking pipe pushed in later.

[0042] Embodiment 3. On the basis of Embodiment 1, a mounting template 1 and a mounting template 201 are installed at the inner bottom of the connecting piece body 1 through fixing bolts; a collection box 202 is installed on the top of the mounting template 201; a driving pump is installed on the side of the collection box 202, and a diversion pipe 203 is installed at the output end of the driving pump; the diversion pipe 203 is made of a flexible material, and an air suction hood 204 is installed at the side end of the diversion pipe 203. Among them, an air suction groove 205 is provided at the bottom of the air suction hood 204; a connecting support plate 1206 is rotatably installed on the top of the mounting template 1; a concentrating plate 207 is rotatably installed at the side end of the connecting support plate 1206; a traction rope 208 is installed at the bottom of the concentrating plate 207; the bottom of the traction rope 208 is connected to the top of the air suction hood 204; a spring is installed on the outside of the connecting support plate 1206, and the outside of the connecting support plate 1206 is connected to the top of the mounting template 1 through the spring; a connecting support plate 2209 is rotatably installed on the side of the concentrating plate 207; the side of the connecting support plate 2209 is connected to the side of the connecting support plate 1206 through a spring, and a stress plate 2010 is rotatably installed at the bottom of the connecting support plate 2209;The force-bearing plate 3010 is of an L-shaped structure. A connecting plate 3011 is installed between two force-bearing plates 3010. During the connection process of rectangular pipe jacking pipe sections, the installation template one 3 and the installation template two 301 are temporarily installed at the inner bottom of the connector body 1 through fixing bolts. The installation method of the fixing bolts has a lower cost, and the installation and subsequent removal are more convenient. Even if the fixing bolts are damaged, the replacement cost is relatively low. The driving pump on the side of the collection box 302 works. The driving pump absorbs the airflow and the soil carried by the airflow through the diversion pipe 303 and the suction groove 305 at the bottom of the suction hood 304. The pipe body 4 is movably installed on the side of the connector body 1. Then, the edge position at the inner bottom of the pipe body 4 pushes the force-bearing plate 3010 to move. The connecting plate 3011 ensures the synchronous movement of the two force-bearing plates 3010. The spring between the force-bearing plate 3010 and the connecting support plate one 306 contracts. After the force-bearing plate 3010 and the connecting support plate one 306 are folded, they drive the concentrating plate 307 to move upward. The concentrating plate 307 drives the suction hood 304 to move upward through the traction rope 308. As the suction hood 304 moves upward, the suction groove 305 absorbs the soil existing between the side of the connector body 1 and the pipe body 4. As the force-bearing plate 3010 moves, the connecting support plate one 306 drives the suction hood 304 pulled below the concentrating plate 307 to move backward, so that the suction hood 304 is located inside the connector body 1 and does not affect the movement of the pipe body 4. After the suction hood 304 absorbs the soil, the problem of soil accumulation is reduced, the sealing performance of the connection between the pipe body 4 and the connector body 1 is ensured, the gap between the connections is further reduced, and the problem of leakage in the later stage is prevented, improving the tightness and quality of the rectangular pipe section connection. After the peeled soil is absorbed, taking ten or twenty rectangular pipe jacking as a group, the fixing bolts in the grouped rectangular pipe sections can be quickly disassembled, and the installation template one 3 and the installation template two 301 distributed in groups can be quickly disassembled and reused.

[0043] Working principle of this embodiment: The fixed rod 2 is directly inserted into the rectangular pipe section in the prefabrication stage. After the concrete of the rectangular pipe section solidifies, rotate the rotating rod 202 to drive the movable plate 203 to move. The movable plate 203 drives the two supporting plates 204 to push the stabilizing plate 205 to move outward. The fixed cone 206 at the outer end of the stabilizing plate 205 is inserted into the interior of the rectangular pipe section through the positioning hole 201 to increase the stability of the fixed rod 2. After the connecting piece body 1 is installed at one end of the rectangular pipe jacking, it is hoisted into the pipeline through the pipeline well along with the rectangular pipe jacking. When the rectangular pipe jacking moves, the rectangular pipe jacking pushes the elastic positioning plate 106 to move. The elastic positioning plate 106 is located in the positioning groove 401. The continuous movement of the pipe body 4 pushes both ends of the elastic positioning plate 106 to drive the guiding sliding plate 104 to move along the guiding chute 102. The elastic positioning plate 106 positions the moving pipe body 4. The pipe body 4 moves vertically forward to connect. The driving pump on the side of the collection box 302 absorbs the soil carried by the airflow through the diversion pipe 303 and the air suction groove 305 at the bottom of the air suction hood 304. When the pipe body 4 moves and is installed on the side of the connecting piece body 1, it pushes the force-bearing plate 3010 to move. After the force-bearing plate 3010 and the first connecting support plate 306 are folded, they drive the concentrating plate 307 to move upward. The concentrating plate 307 drives the air suction hood 304 to move upward through the traction rope 308. The air suction groove 305 continuously absorbs the soil existing between the side of the connecting piece body 1 and the pipe body 4, reduces the problem of soil accumulation, and ensures the sealing performance of the connection between the pipe body 4 and the connecting piece body 1.

[0044] In this article, the following points need to be noted:

[0045] 1. The attached drawings of the embodiments of the present invention only relate to the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0046] 2. Without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0047] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A rectangular pipe jacking pipe joint connection device with a positioning structure, characterized in that, Including: A connecting piece main body (1), a positioning cover (101) is installed at the edge position of the side surface of the connecting piece main body (1), and four guiding sliding grooves (102) are arranged on the side surface of the connecting piece main body (1); a pipe body (4) is installed on the side surface of the connecting piece main body (1); a positioning groove (401) is arranged at the side end of the pipe body (4), and the side end of the pipe body (4) is inside the positioning cover (101); an installation template one (3) and an installation template two (301) are installed at the inner bottom of the connecting piece main body (1) through fixing bolts; a collection box (302) is installed at the top of the installation template two (301); a driving pump is installed on the side surface of the collection box (302), and a diversion pipe (303) is installed at the output end of the driving pump; an air suction cover (304) is installed at the side end of the diversion pipe (303), wherein an air suction groove (305) is arranged at the bottom of the air suction cover (304); a connecting support plate one (306) is rotatably installed at the top of the installation template one (3); a concentrating plate (307) is rotatably installed at the side end of the connecting support plate one (306); a traction rope (308) is installed at the bottom of the concentrating plate (307); the bottom of the traction rope (308) is connected with the top of the air suction cover (304); a spring is installed on the outer side of the connecting support plate one (306), and the outer side of the connecting support plate one (306) is connected with the top of the installation template one (3) through the spring; a connecting support plate two (309) is rotatably installed at the side surface of the concentrating plate (307); the side surface of the connecting support plate two (309) is connected with the side surface of the connecting support plate one (306) through a spring, and a stress plate (3010) is rotatably installed at the bottom of the connecting support plate two (309); a connecting plate (3011) is installed between the two stress plates (3010).

2. The rectangular pipe-jacking pipe joint connection device with a positioning structure according to claim 1, characterized in that, A positioning block (103) is installed at the middle position of the guiding sliding groove (102), and a guiding sliding plate (104) is slidably installed inside the guiding sliding groove (102).

3. The rectangular pipe jacking pipe joint connection device with a positioning structure according to claim 2, characterized in that, A guiding wheel (105) is rotatably installed at the side surface of the guiding sliding plate (104); the guiding wheel (105) is rotatably installed inside the guiding sliding groove (102).

4. The rectangular pipe jacking pipe joint connecting device with a positioning structure according to claim 3, characterized in that, A spring is installed at the side surface of the guiding sliding plate (104), and the side surface of the guiding sliding plate (104) is connected with the side surface of the positioning block (103) through the spring; an elastic positioning plate (106) is rotatably installed at the outer end of the guiding sliding plate (104); the middle position of the elastic positioning plate (106) is inside the positioning groove (401).

5. A rectangular pipe-jacking pipe joint connecting device with a positioning structure according to claim 4, characterized in that, Six fixing rods (2) are installed on the other side surface of the connecting piece main body (1); a plurality of positioning holes (201) are evenly distributed on the outer side of the fixing rods (2).

6. The rectangular pipe-jacking pipe joint connecting device with a positioning structure according to claim 5, characterized in that, A rotating rod (202) is rotatably installed inside the fixing rod (2); the outer ends of four rotating rods (202) penetrate through the side surface of the connecting piece main body (1) to be provided with driving handles, and the outer ends of two rotating rods (202) penetrate through the side surfaces of the connecting piece main body (1) and the positioning block (103).

7. A rectangular pipe jacking pipe joint connection device with a positioning structure according to claim 6, characterized in that, An activity plate (203) is installed on the outer side of the rotating rod (202); a support plate (204) is installed on the outer side of the activity plate (203) through a rotating shaft; the side end of the support plate (204) is rotatably installed on the inner side of the stable plate (205).

8. A rectangular pipe-jacking pipe joint connection device with a positioning structure according to claim 7, characterized in that The upper and lower stable plates (205) are closed together, and a fixed cone (206) is installed on the outer side of the stable plate (205); the outer end of the fixed cone (206) is slidably installed inside the positioning hole (201).

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