Connection mode for judging front face and back face of iron tower

Abstract

The invention belongs to the technical field of power transmission line engineering, and particularly relates to an iron tower connection mode for judging the front face and the back face, and the connection mode comprises the following specific steps: S1, building an iron tower footing at an iron tower assembling position, and installing a tower crane; s2, all parts of the iron tower are assembled on the ground and then placed according to the iron tower building sequence; s3, iron tower bottom components are installed on the tower footing, during fixing, connection is conducted in a three-hole fixing mode, the positions of three holes are distributed unevenly, the distance between the first mounting hole and the second mounting hole is larger than that between the second mounting hole and the third mounting hole from top to bottom, and fixing is conducted through bolts; through the arrangement of the sliding frame, the guide rod, the cleaning brush and the pressing plate, a structure for cleaning the mounting hole is formed, the function of cleaning the mounting hole before iron tower parts are mounted is achieved, the situation that impurities adhere to the interior of the mounting hole, and consequently bolts and the mounting hole are abnormally abraded is avoided, the service life is prolonged, and the stability of an iron tower after mounting is improved.

Description

Technical Field

[0001] This invention belongs to the field of power transmission line engineering technology, specifically a connection method for determining the front and back of a transmission tower. Background Technology

[0002] Iron towers are important building structures used in fields such as power, communications, broadcasting, radar, and navigation, and are an important component of modern infrastructure construction.

[0003] The main function of a steel tower is to support or suspend equipment such as power lines, cables, and antennas to ensure the normal operation of power and communication infrastructure. Steel towers are classified into transmission towers, communication towers, microwave relay towers, and monitoring towers. During the construction of a steel tower, it is first assembled on the ground. When connecting the various components, attention should be paid to the front and back positions. Then, they are fixed with bolts. A crane is used to lift and install the various components of the steel tower. Finally, it is inspected.

[0004] In existing tower connection technologies, during outdoor installation, tower components are stacked on the ground, which can cause dirt or impurities to adhere to the mounting holes. After bolts are inserted into the mounting holes for fixing, abnormal wear may occur on the bolts or mounting holes, causing the tower to sway.

[0005] Therefore, the present invention provides a connection method for determining the front and back of a tower. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is: a connection method for determining the front and back of a steel tower, the specific steps of which are as follows: S1: Construct the tower foundation at the tower erection site and install the tower crane; S2: Assemble the various components of the iron tower on the ground, and then place them in the order in which the iron tower was built; S3: Install the bottom components of the iron tower onto the tower base. When fixing, a three-hole fixing method is used for connection. The three holes are unevenly distributed. From top to bottom, the distance between the first and second mounting holes is greater than the distance between the second and third mounting holes. The end with the larger distance is the upper end, which is fixed with bolts. S4: Raise the height of the hoisting equipment and assemble the tower body from bottom to top. Use fixing auxiliary devices to fix it during installation. Assemble each layer of the tower in sequence. S5: Hoisting the tower head and installing tower accessories; S6: Dismantle the hoisting equipment; assembly complete.

[0008] Preferably, the aforementioned fixing auxiliary device includes a mounting plate; a sliding frame is slidably connected to the side wall of the mounting plate; a guide rod is slidably connected to the middle of the sliding frame; three sets of guide rods are arranged in the middle of the sliding frame; a pressing plate is fixedly connected to the ends of the three sets of guide rods away from the mounting plate; a cleaning brush is fixedly connected to the outer side wall of the guide rod away from the pressing plate; a clamping assembly is provided on the side wall of the mounting plate away from the sliding frame; a positioning assembly is provided in the middle of the mounting plate; this step, through the arrangement of the sliding frame, guide rod, cleaning brush, and pressing plate, forms a structure for cleaning the mounting hole, realizing the function of cleaning the mounting hole before the installation of the tower components, solving the problem of impurities adhering in the mounting hole causing abnormal wear between the bolt and the mounting hole, improving service life, and increasing the stability of the tower after installation.

[0009] Preferably, the clamping assembly includes a telescopic rod, a fixed plate, a top rod, a spring, and a suction cup; the telescopic rod is fixedly connected to the side wall of the mounting plate away from the sliding frame; multiple sets of telescopic rods are arranged symmetrically on the side wall of the mounting plate away from the sliding frame; the fixed plate is fixedly connected to the end of the telescopic rod away from the mounting plate; the top rod is slidably connected in the middle of the fixed plate; the spring is sleeved on the outer side wall of the top rod; one end of the spring is fixedly connected to the outer side wall of the fixed plate; the other end of the spring is fixedly connected to the ends of the top rod that are far apart from each other; the suction cup is fixedly connected to the end of the top rod away from the spring; a pull-out assembly is provided at the end of the top rod away from the suction cup; this step, through the arrangement of the telescopic rod, fixed plate, top rod, spring, and suction cup, forms a clamping and fixing structure, realizing the clamping and fixing of the device on the tower component, solving the problem of device shaking during tower installation, improving the stability of the device on the tower component, and reducing the situation where the device shifts during bolt fixing, resulting in the bolts not being able to be installed.

[0010] Preferably, the positioning component includes a positioning plate, positioning holes, and guide grooves; the positioning plate is slidably connected to the middle of the mounting plate; the positioning holes are formed in the middle of the positioning plate; three sets of positioning holes are provided in the middle of the positioning plate; the guide grooves are fixedly connected to the side wall of the positioning plate near the positioning holes; three sets of guide grooves are provided on the side wall of the positioning plate and correspond to the three sets of positioning holes; this step, through the setting of the positioning plate, positioning holes, and guide grooves, forms a bolt installation positioning structure, realizing the positioning function during bolt installation, improving the accuracy of bolt installation, shortening the bolt installation time, and the guide grooves support the bolts, reducing the possibility of bolts falling out when inserted into the mounting holes.

[0011] Preferably, the pull-out assembly includes a handle and a sponge pad; the handle is fixedly connected to the end of a set of push rods away from the suction cup; a pair of handles are provided at the ends of the push rods and are symmetrically arranged; the sponge pad is fixedly connected to the side wall of the handle near the push rod; multiple sets of sponge pads are provided on the side wall of the handle; this step, through the arrangement of the handle and the sponge pad, forms a synchronous pull-out structure, realizing the function of simultaneous movement of the push rods on the same side, solving the problem of pulling the push rods out separately, improving the speed of device fixation, and increasing the comfort of device use.

[0012] Preferably, a guide block is fixedly connected to the end of the guide rod away from the pressing plate; the guide block is provided at the ends of all three sets of guide rods; this step, through the setting of the guide block, allows the guide block to move within the positioning hole and the mounting hole, thereby detecting whether the mounting hole and the positioning hole are aligned, and improving the accuracy of bolt installation.

[0013] Preferably, a collection box is fixedly connected to the side wall of the mounting plate away from the positioning plate; this step, by setting up the collection box, forms an impurity collection structure, realizes the function of collecting impurities, reduces the situation of impurities falling onto other objects and causing dirt, and improves the convenience of impurity collection.

[0014] Preferably, a gasket is fixedly connected to the side wall of the mounting plate near the telescopic rod; multiple sets of gaskets are provided on the side wall of the mounting plate and are arranged symmetrically; this step, by setting the gaskets, creates a buffer between the tower components and the device, reducing the possibility of scratches caused by collisions between the mounting plate and the tower components.

[0015] Preferably, a magnet is fixedly connected to the side wall of the mounting plate near the gasket; multiple sets of magnets are arranged symmetrically on the side wall of the mounting plate; this step, through the arrangement of the magnets, allows the magnets to contact and attract the tower components, increasing the stability of the device on the tower components. The beneficial effects of this invention are as follows: 1. The connection method for determining the front and back of a steel tower as described in this invention, through the arrangement of a sliding frame, guide rod, cleaning brush and pressing plate, forms a structure for cleaning the installation hole, realizing the function of cleaning the installation hole before the installation of steel tower components, solving the problem of abnormal wear between bolts and installation holes caused by impurities adhering in the installation hole, improving service life and increasing the stability of the steel tower after installation.

[0016] 2. The connection method for determining the front and back of a steel tower as described in this invention, through the arrangement of a telescopic rod, a fixing plate, a top rod, a spring, and a suction cup, forms a clamping and fixing structure, which realizes the clamping and fixing of the device to the steel tower component, solves the problem of the device shaking during the installation of the steel tower, improves the stability of the device on the steel tower component, and reduces the situation where the device shifts during bolt fixing, resulting in the bolts not being able to be installed. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a flowchart of the working steps of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 This is a schematic diagram of the structure of the top rod and the handle in this invention; Figure 4 This is a schematic diagram of the structure in which the positioning plate and the guide groove cooperate in this invention; Figure 5 This is a schematic diagram of the structure of the pressing plate and the cleaning brush in this invention.

[0019] In the diagram: 1. Mounting plate; 11. Sliding frame; 12. Guide rod; 13. Cleaning brush; 14. Pressing plate; 2. Telescopic rod; 21. Fixing plate; 22. Top rod; 23. Spring; 24. Suction cup; 3. Positioning plate; 31. Positioning hole; 32. Guide groove; 4. Handle; 41. Sponge pad; 5. Guide block; 6. Collection box; 7. Gasket; 8. Magnet. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figure 1 As shown in the embodiment of the present invention, a connection method for determining the front and back of a steel tower is described. The specific steps of this connection method are as follows: S1: Construct the tower foundation at the tower erection site and install the tower crane; S2: Assemble the various components of the iron tower on the ground, and then place them in the order in which the iron tower was built; S3: Install the bottom components of the iron tower onto the tower base. When fixing, a three-hole fixing method is used for connection. The three holes are unevenly distributed. From top to bottom, the distance between the first and second mounting holes is greater than the distance between the second and third mounting holes. The end with the larger distance is the upper end, which is fixed with bolts. S4: Raise the height of the hoisting equipment and assemble the tower body from bottom to top. Use fixing auxiliary devices to fix it during installation. Assemble each layer of the tower in sequence. S5: Hoisting the tower head and installing tower accessories; S6: Dismantle the hoisting equipment; assembly complete.

[0022] like Figure 2 , Figure 4 and Figure 5As shown, the aforementioned fixing auxiliary device includes a mounting plate 1; a sliding frame 11 is slidably connected to the side wall of the mounting plate 1; a guide rod 12 is slidably connected to the middle of the sliding frame 11; three sets of guide rods 12 are arranged in the middle of the sliding frame 11; a pressing plate 14 is fixedly connected to the ends of the three sets of guide rods 12 away from the mounting plate 1; a cleaning brush 13 is fixedly connected to the outer side wall of the guide rods 12 away from the pressing plate 14; a clamping assembly is provided on the side wall of the mounting plate 1 away from the sliding frame 11; a positioning assembly is provided in the middle of the mounting plate 1; during operation, when the iron tower is installed, the device is installed near the iron tower mounting hole, the clamping assembly fixes the device to the iron tower component, and the positioning assembly aligns the device with the mounting hole. Before installing the bolts, slide the sliding bracket 11 to align the guide rod 12 with the mounting hole, press the pressing plate 14, and insert the cleaning brush 13 into the mounting hole to clean the inner wall of the mounting hole, removing the mud or impurities adhering to the mounting hole. After cleaning, pull the cleaning brush 13 and guide rod 12 out of the mounting hole, slide the sliding bracket 11 to reset it, and then fix the bolts. This step, through the arrangement of the sliding bracket 11, guide rod 12, cleaning brush 13, and pressing plate 14, forms a structure for cleaning the mounting hole, realizing the function of cleaning the mounting hole before the installation of the tower components, solving the problem of abnormal wear between the bolts and the mounting hole caused by impurities adhering to the mounting hole, improving service life, and increasing the stability of the tower after installation.

[0023] like Figure 2 and Figure 3 As shown, the clamping assembly includes a telescopic rod 2, a fixing plate 21, a push rod 22, a spring 23, and a suction cup 24. The telescopic rod 2 is fixedly connected to the side wall of the mounting plate 1 away from the sliding frame 11. Multiple sets of telescopic rods 2 are arranged symmetrically on the side wall of the mounting plate 1 away from the sliding frame 11. The fixing plate 21 is fixedly connected to the end of the telescopic rod 2 away from the mounting plate 1. The push rod 22 is slidably connected to the middle of the fixing plate 21. The spring 23 is sleeved on the outer side wall of the push rod 22. One end of the spring 23 is fixedly connected to the outer side wall of the fixing plate 21. The other end of the spring 23 is fixedly connected to the ends of the push rod 22 that are far apart from each other. The suction cup 24 is fixedly connected to the end of the push rod 22 away from the spring 23. The push rod 22 is far apart from the suction cup. The end of 24 is equipped with a pull-out assembly. During operation, when installing the device, the pull-out assembly is used to pull the top rod 22 outward, causing the suction cups 24 to move away from each other. The spring 23 is stretched, and the mounting plate 1 is brought close to the tower component to release the pull-out assembly. The spring 23 drives the top rod 22 and suction cups 24 to return to their original positions. The suction cups 24 contact and adhere to the side wall of the tower component, fixing the device to the tower component. This step, through the arrangement of the telescopic rod 2, fixing plate 21, top rod 22, spring 23 and suction cups 24, forms a clamping and fixing structure, which realizes the clamping and fixing of the device to the tower component. This solves the problem of the device shaking during tower installation, improves the stability of the device on the tower component, and reduces the situation where the device shifts during bolt fixing, causing the bolts to fail to be installed.

[0024] like Figure 2 and Figure 4 As shown, the positioning assembly includes a positioning plate 3, positioning holes 31, and guide grooves 32. The positioning plate 3 is slidably connected to the middle of the mounting plate 1. The positioning holes 31 are located in the middle of the positioning plate 3. Three sets of positioning holes 31 are provided in the middle of the positioning plate 3. The guide grooves 32 are fixedly connected to the side wall of the positioning plate 3 near the positioning holes 31. Three sets of guide grooves 32 are provided on the side wall of the positioning plate 3 and correspond to the three sets of positioning holes 31. During operation, the positioning holes 31 correspond to the spacing of the mounting holes on the tower component. When the device is installed on the side wall of the tower component, the sliding positioning plate 3 aligns the positioning holes 31 with the mounting holes on the tower component. The fixing bolt is placed on the guide groove 32 and pushed into the positioning hole 31, and then tightened. This step, through the setting of the positioning plate 3, positioning holes 31, and guide grooves 32, forms a bolt installation positioning structure, realizing the positioning function during bolt installation, improving the accuracy of bolt installation, shortening the bolt installation time, and the guide grooves 32 support the bolt, reducing the possibility of the bolt falling out when inserted into the mounting hole.

[0025] like Figure 3 As shown, the pull-out assembly includes a handle 4 and a sponge pad 41. The handle 4 is fixedly connected to the end of a set of top rods 22 away from the suction cup 24. A pair of handles 4 are provided at the ends of the top rods 22 and are arranged symmetrically. The sponge pad 41 is fixedly connected to the side wall of the handle 4 near the top rods 22. Multiple sets of sponge pads 41 are provided on the side wall of the handle 4. During operation, when installing the device, the pair of handles 4 are pulled outwards, causing the top rods 22 on one side to move synchronously, and the hand contacts the sponge pad 41. This step, through the arrangement of the handles 4 and the sponge pad 41, forms a synchronous pull-out structure, realizing the function of simultaneous movement of the top rods 22 on the same side, solving the problem of pulling the top rods 22 separately, improving the speed of device fixation, and increasing the comfort of device use.

[0026] like Figure 5 As shown, a guide block 5 is fixedly connected to the end of the guide rod 12 away from the pressing plate 14; the guide block 5 is provided at the ends of all three sets of guide rods 12; during operation, when the pressing plate 14 is pushed, the guide rod 12 is inserted into the positioning hole 31 and the mounting hole, and the guide block 5 moves within the positioning hole 31 and the mounting hole, playing a role in positioning and guiding; this step, through the setting of the guide block 5, the guide block 5 moves within the positioning hole 31 and the mounting hole, which plays a role in detecting whether the mounting hole and the positioning hole 31 are aligned, thereby improving the accuracy of bolt installation.

[0027] like Figure 2As shown, a collection box 6 is fixedly connected to the side wall of the mounting plate 1 away from the positioning plate 3. During operation, when the cleaning brush 13 cleans the mounting hole, the sludge or impurities brought out by the cleaning brush 13 from the mounting hole fall into the collection box 6 and are collected by the collection box 6. This step, through the setting of the collection box 6, forms an impurity collection structure, realizes the function of collecting impurities, reduces the situation of impurities falling onto other objects and causing dirt, and improves the convenience of impurity collection.

[0028] like Figure 5 As shown, a gasket 7 is fixedly connected to the side wall of the mounting plate 1 near the telescopic rod 2; multiple sets of gaskets 7 are provided on the side wall of the mounting plate 1 and are arranged symmetrically; during operation, when the mounting plate 1 is installed on the side wall of the tower component, the gasket 7 is placed between the tower component and the device to play a buffering role; this step, through the setting of the gasket 7, creates a buffer between the tower component and the device, reducing the possibility of scratches caused by collisions between the mounting plate 1 and the tower component.

[0029] like Figure 5 As shown, a magnet 8 is fixedly connected to the side wall of the mounting plate 1 near the gasket 7; multiple sets of magnets 8 are arranged symmetrically on the side wall of the mounting plate 1; during operation, when the mounting plate 1 is installed on the side wall of the iron tower component, the magnets 8 are attracted to the side wall of the iron tower component; this step, through the arrangement of the magnets 8, allows the magnets 8 to contact and attract the iron tower component, increasing the stability of the device on the iron tower component.

[0030] During operation, when installing the tower, the device is installed near the tower mounting hole. The clamping assembly secures the device to the tower component. The positioning assembly aligns the device with the mounting hole. Before installing the bolts, the sliding bracket 11 is slid to align the guide rod 12 with the mounting hole. The pressing plate 14 is pressed down, and the cleaning brush 13 is inserted into the mounting hole to clean the inner wall of the mounting hole, removing any adhering mud or impurities. After cleaning, the cleaning brush 13 and guide rod 12 are pulled out of the mounting hole, and the sliding bracket 11 is slid back to its original position before bolting. When installing the device, the pull-out assembly is used to pull the top rod 22 outward, causing the suction cups 24 to move away from each other. The spring 23 is stretched, and the mounting plate 1 is brought close to the tower component. The pull-out assembly is then released, and the spring 23 causes the top rod 22 and suction cups 24 to return to their original positions. The suction cups 24 contact and adhere to the side wall of the tower component, securing the device to the tower component. The positioning hole 31 aligns with the mounting hole on the tower component. The spacing positions correspond to each other. When the device is installed on the side wall of the iron tower component, the sliding positioning plate 3 aligns the positioning hole 31 with the mounting hole on the iron tower component. The fixing bolt is placed on the guide groove 32 and pushed into the positioning hole 31, and the fixing bolt is tightened. When installing the device, pull a pair of handles 4 outward to move the top rod 22 on one side synchronously, and the hand contacts the sponge pad 41. When the pressing plate 14 is pushed, the guide rod 12 is inserted into the positioning hole 31 and the mounting hole, and the guide block 5 moves in the positioning hole 31 and the mounting hole, playing a positioning and guiding role. When the cleaning brush 13 cleans the mounting hole, the mud or impurities brought out by the cleaning brush 13 fall into the collection box 6 and are collected by the collection box 6. When the mounting plate 1 is installed on the side wall of the iron tower component, the gasket 7 is placed between the iron tower component and the device to play a buffer role. When the mounting plate 1 is installed on the side wall of the iron tower component, the magnet 8 is attracted to the side wall of the iron tower component.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection method for determining the front and back sides of an iron tower, characterized in that: The specific steps of this connection method are as follows: S1: Build the tower foundation at the tower assembly location and install the tower crane; S2: Assemble the tower components on the ground and place them in the order of tower construction; S3: Install the bottom part of the tower on the tower base. Use a three-hole fixing method to connect. The three holes are unevenly distributed. From top to bottom, the distance between the first mounting hole and the second mounting hole is greater than the distance between the second mounting hole and the third mounting hole. The end with the larger distance is the upper end, and is fixed by bolts. S4: Raise the height of the hoisting equipment, assemble the tower from bottom to top, use the fixing auxiliary device to fix it during installation, and assemble each layer of the tower in sequence; S5: Hoist the tower head and install tower accessories; S6: Remove the lifting equipment and complete the assembly.

2. A connection method for determining the front and back sides of an iron tower according to claim 1, characterized in that: The fixing auxiliary device in S4 comprises a mounting plate (1); a sliding frame (11) is slidably connected to the side wall of the mounting plate (1); a guide rod (12) is slidably connected to the middle of the sliding frame (11); three groups of the guide rods (12) are arranged in the middle of the sliding frame (11); the ends of the three groups of guide rods (12) away from the mounting plate (1) are fixedly connected to a pressing plate (14); the outer side wall of the guide rod (12) away from the pressing plate (14) is fixedly connected to a cleaning brush (13); a clamping assembly is provided on the side wall of the mounting plate (1) away from the sliding frame (11); and a positioning assembly is provided in the middle of the mounting plate (1).

3. A connection method for determining the front and back sides of an iron tower according to claim 2, characterized in that: The clamping assembly comprises a telescopic rod (2), a fixing plate (21), a push rod (22), a spring (23) and a suction cup (24); the telescopic rod (2) is fixedly connected to a side wall of the mounting plate (1) away from the sliding frame (11); a plurality of telescopic rods (2) are arranged on the side wall of the mounting plate (1) away from the sliding frame (11), and are symmetrically arranged; the fixing plate (21) is fixedly connected to an end of the telescopic rod (2) away from the mounting plate (1); the push rod (22) is slidably connected to the middle of the fixing plate (21); the spring (23) is sleeved on the outer side wall of the push rod (22); one end of the spring (23) is fixedly connected to the outer side wall of the fixing plate (21); the other end of the spring (23) is fixedly connected to the ends of the push rod (22) away from each other; the suction cup (24) is fixedly connected to the end of the push rod (22) away from the spring (23); and a pulling assembly is provided at the end of the push rod (22) away from the suction cup (24).

4. A connection method for determining the front and back sides of an iron tower according to claim 2, characterized in that: The positioning assembly comprises a positioning plate (3), a positioning hole (31) and a guide groove (32); the positioning plate (3) is slidably connected to the middle of the mounting plate (1); the positioning hole (31) is opened in the middle of the positioning plate (3); three groups of positioning holes (31) are arranged in the middle of the positioning plate (3); the guide groove (32) is fixedly connected to the side wall of the positioning plate (3) near the positioning hole (31); three groups of guide grooves (32) are arranged on the side wall of the positioning plate (3), and correspond to the three groups of positioning holes (31).

5. A connection method for determining the front and back sides of an iron tower according to claim 3, characterized in that: The pull-out assembly comprises a handle (4) and a sponge pad (41); the handle (4) is fixedly connected to an end of a group of push rods (22) away from the suction cup (24); a pair of the handles (4) are arranged at the ends of the push rods (22) and are arranged symmetrically; the sponge pad (41) is fixedly connected to a side wall of the handle (4) close to the push rod (22); and multiple groups of the sponge pads (41) are arranged on the side wall of the handle (4).

6. A connection method for determining the front and back sides of an iron tower according to claim 2, characterized in that: The ends of the guide rods (12) away from the pressing plate (14) are fixedly connected to guide blocks (5); the guide blocks (5) are arranged at the ends of the three groups of guide rods (12).

7. A connection method for determining the front and back sides of an iron tower according to claim 4, characterized in that: A collecting box (6) is fixedly connected to a side wall of the mounting plate (1) away from the positioning plate (3).

8. The connection method for determining the front and back sides of an iron tower according to claim 3, characterized in that: A gasket (7) is fixedly connected to the side wall of the mounting plate (1) close to the telescopic rod (2); multiple groups of the gaskets (7) are arranged on the side wall of the mounting plate (1) and are symmetrically arranged.

9. A connection method for determining the front and back sides of an iron tower according to claim 8, characterized in that: A magnet (8) is fixedly connected to the side wall of the mounting plate (1) close to the gasket (7); multiple groups of the magnets (8) are arranged on the side wall of the mounting plate (1) and are symmetrically arranged.

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