Steel pipe installation and positioning method for steel structure tubular truss construction

Abstract

This invention discloses a method for installing and positioning steel pipes, particularly a method for installing and positioning steel pipes in the construction of steel structure pipe trusses, belonging to the technical field of steel structure bridge engineering structure construction technology. It provides a method for installing and positioning steel pipes in the construction of steel structure pipe trusses that allows for the accurate pre-installation of corbels onto corresponding positions on the steel truss. The method includes arch rib preparation and steel pipe preparation. First, a laser detector is installed inside the prepared steel pipe, and the measuring light of the laser detector is aligned with the axial centerline of the steel pipe. Then, the measuring light emitted by the laser detector is used to align the steel pipe with the crosshairs pre-marked on the left or right arch rib. Finally, the steel pipe is positioned and welded to the left or right arch rib to complete the positioning and installation of the steel pipe.

Description

Technical Field

[0001] This invention relates to a method for installing and positioning steel pipes, and more particularly to a method for installing and positioning steel pipes in the construction of steel structure pipe trusses, belonging to the technical field of construction technology for steel structure bridge engineering structures. Background Technology

[0002] Steel structures are characterized by their light weight and fast assembly and construction speed, leading to the increasing adoption of tubular truss structures in large stadiums and steel pipe arch bridge projects. In the manufacturing and installation of steel tubular trusses, the connections between each truss section are mostly achieved using corbel connections. Accurate control of the corbel installation points and angles is crucial to ensure alignment between the corbel and the connecting pipe, guaranteeing aligned butt joints with weld widths meeting design requirements, thus ensuring welding quality and the structural load-bearing capacity. The large distances between each truss section and the numerous angles of the connecting pipes present significant challenges to corbel positioning.

[0003] The conventional method for installing and positioning the bracket is to spot weld the bracket to the connecting pipe, then hoist it into position during a trial installation and securely spot weld the bracket to the corresponding location on the truss. The connecting pipe is then cut and removed before welding the bracket. This process is time-consuming with hoisting equipment, affects the appearance quality of the welded surface, increases the number of assembly, spot welding, and cutting steps, has low assembly efficiency, is not conducive to saving energy, welding materials, and cutting gas, and also increases safety risks.

[0004] The existing installation positioning technology for tubular trusses, "Positioning Method for Intersection Space of Secondary Members of Tubular Trusses" (CN 103389081B), adopts a positioning method that marks the main members. This method is suitable for situations where secondary members are directly connected without corbels, but it cannot be used to determine the installation angle of corbels connecting ultra-long members. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a steel pipe installation and positioning method for the construction of steel structure pipe trusses, which can directly and accurately pre-install the brackets onto the corresponding positions on the steel truss.

[0006] The technical solution adopted to solve the above-mentioned technical problems is: a steel pipe installation and positioning method for the construction of steel structure pipe trusses, including arch rib preparation and steel pipe preparation. The steel pipe installation and positioning method first installs a laser detector inside the prepared qualified steel pipe and makes the measuring light of the laser detector coincide with the axial center line of the steel pipe. Then, the measuring light emitted by the laser detector is used to align the qualified left or right arch rib with cross lines installed on the steel pipe marked on the left or right arch rib beforehand. Finally, the steel pipe is positioned and welded to the left or right arch rib to complete the positioning and installation of the steel pipe.

[0007] Furthermore, during the preparation of the steel pipe, the intersection line that is welded to the left or right arch rib is cut out at the end. When the cross line of the steel pipe is aligned on the qualified left or right arch rib by measuring the light, in addition to the center point coinciding, the four directional marking lines of the end of the steel pipe with the intersection line are aligned with the cross line on the corresponding arch rib.

[0008] The preferred embodiment of the above scheme is that the laser detector is a laser, which is quickly installed inside the prepared qualified steel pipe through an adjustable mounting bracket.

[0009] Furthermore, the adjustable mounting bracket includes a support and fixing rod assembly and an adjustment mechanism. The laser is positioned at the geometric center of the adjustment mechanism, which is movably supported at the center of the end of the steel pipe to be installed via the support and fixing rod assembly.

[0010] The preferred embodiment of the above scheme is that the reciprocating movable mechanism is connected to the adjustment mechanism; the free ends of each set of self-supporting fixing rods, once adjusted and positioned, are supported on the inner side wall of the end of the steel pipe to be installed.

[0011] Furthermore, each set of self-supporting fixing rods includes a self-supporting support base, a support connecting rod, and a movable adjustment component. The movable adjustment component is arranged axially on the support connecting rod. The support connecting rod, adjusted into position by the movable adjustment component in cooperation with the adjustment mechanism, is detachably and fixedly connected to the inner wall of the end of the steel pipe to be installed through the self-supporting support base.

[0012] The self-supporting base consists of a disc-shaped magnet, which is covered with a protective steel shell. The free end of the support connecting rod is fixedly connected to the disc-shaped magnet.

[0013] The preferred embodiment of the above scheme is that the adjustment mechanism includes a mounting frame and an adaptive adjustment component. The adaptive adjustment component is arranged inside the mounting frame, the laser detector is arranged on the mounting frame, and the support connecting rod is arranged on the adjustment mechanism in an axially reciprocating manner through the cooperation of the movable adjustment component and the adaptive adjustment component.

[0014] Furthermore, the mounting bracket includes a mounting plate and a housing, with the laser detector arranged on the housing, the housing covering the mounting plate, and the adaptive adjustment component arranged in the mounting cavity formed by the housing and the mounting plate via the mounting plate.

[0015] The preferred embodiment of the above scheme is that the adaptive adjustment assembly includes six sets of adaptive adjustment components. Each set of adaptive adjustment components is arranged circumferentially on the mounting plate. Each support connecting rod is sandwiched between two pairs of four sets of adaptive adjustment components with the geometric center of the mounting plate as the moving support point, through the axial centerline of the movable adjustment component. The movable adjustment component of one support connecting rod is arranged on the adjustment mechanism in a way that allows it to reciprocate axially relative to the mounting frame, cooperating with two pairs of four sets of adaptive adjustment components on the same diameter.

[0016] Furthermore, each set of adaptive adjustment components includes at least one set of rolling support bearings, one mounting shaft, and one set of adjusting gears. The adjusting gears are fixed to the inner ring of the rolling support bearings via the mounting shaft. The movable adjustment component is a set of racks arranged axially on both sides of the support connecting rod.

[0017] A rolling limit bearing is arranged at the top of each mounting shaft, and a blocking limit plate is also provided at the end of each support connecting rod that protrudes from the housing. The upper end of the adaptive adjustment assembly is kept stable by the cooperation of the rolling limit bearing and the housing.

[0018] The beneficial effects of this invention are as follows: The technical solution provided in this application is based on the manufactured arch ribs and corbel steel pipes. First, a laser detector is installed inside the prepared qualified steel pipe, and the measuring light of the laser detector is made to coincide with the axial center line of the steel pipe. Then, the measuring light emitted by the laser detector is used to align the qualified left or right arch ribs. Cross lines are installed on the steel pipe marked on the left or right arch ribs in advance. Finally, the steel pipe is positioned and welded to the left or right arch ribs to complete the positioning and installation of the steel pipe. This changes the existing technology that requires spot welding between the corbel steel pipe and the connector, followed by installation and spot welding in the pre-assembled state of the arch rib, and finally removal of the connector before welding the corbel steel pipe to the corresponding position on the arch rib. Instead, it directly installs a laser alignment and positioning device inside the two sets of corbel steel pipes that need to be connected. When installing the corresponding corbel steel pipes to the corresponding positions on the arch rib, the laser alignment and positioning device is used for alignment and positioning. This eliminates the spot welding between the corbel steel pipe and the connector and saves the subsequent dismantling work, achieving the goal of directly and accurately pre-installing the corbels to the corresponding positions on the steel truss arch rib. This not only improves the assembly speed but also effectively ensures the assembly quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the installation of a laser detector in the corbel steel involved in the steel pipe installation and positioning method for steel structure pipe truss construction of the present invention.

[0020] Figure 2The present invention relates to a three-dimensional structural schematic diagram of an adjustable simple mounting frame for installing a laser detector, which is used for the installation and positioning of steel pipes in the construction of steel structure pipe trusses.

[0021] Figure 3 for Figure 2 The main view;

[0022] Figure 4 The present invention relates to a three-dimensional structural diagram of an adjustable simple mounting frame for installing a laser detector, with the shell removed, for the steel pipe installation and positioning method for steel structure pipe truss construction.

[0023] Figure 5 for Figure 4 The main view.

[0024] The components in the diagram are labeled as follows: 1. Steel pipe; 2. Laser detector; 3. Blocking and limiting plate; 4. Adjustable mounting bracket; 5. Support fixing rod assembly; 6. Adjustment mechanism; 7. Self-supporting fixing rod; 8. Self-supporting support seat; 9. Support connecting rod; 10. Moving adjustment component; 11. Mounting bracket; 12. Adaptive adjustment component; 13. Mounting sealing plate; 14. Housing; 15. Adaptive adjustment component assembly; 16. Rolling support bearing; 17. Mounting shaft; 18. Adjusting gear; 19. Rolling limiting bearing. Detailed Implementation

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5The diagram illustrates a steel pipe installation and positioning method for constructing steel structure tubular trusses, provided by this invention, which allows for the accurate pre-installation of corbels onto corresponding positions on steel trusses. The method includes the preparation of arch ribs and steel pipe 1. First, a laser detector 2 is installed inside the prepared steel pipe 1, aligning the measuring beam of the laser detector 2 with the axial centerline of the steel pipe 1. Then, the measuring beam emitted by the laser detector 2 is used to align the steel pipe with pre-marked crosshairs on the left or right arch rib. Finally, the steel pipe 1 is positioned and welded to the left or right arch rib, completing the positioning and installation of the steel pipe 1. The technical solution provided in this application is based on the manufactured arch rib and corbel steel pipes. First, a laser detector is installed inside the qualified steel pipe, and the measuring light of the laser detector is aligned with the axial center line of the steel pipe. Then, the measuring light emitted by the laser detector is used to align the qualified left or right arch rib. Cross lines are installed on the steel pipe marked on the left or right arch rib beforehand. Finally, the steel pipe is positioned and welded to the left or right arch rib to complete the positioning and installation of the steel pipe. This changes the existing technology that requires spot welding between the corbel steel pipe and the connector, followed by installation and spot welding in the pre-assembled state of the arch rib, and finally removal of the connector before welding the corbel steel pipe to the corresponding position on the arch rib. Instead, it directly installs a laser alignment and positioning device inside the two sets of corbel steel pipes that need to be connected. When installing the corresponding corbel steel pipes to the corresponding positions on the arch rib, the laser alignment and positioning device is used for alignment and positioning. This eliminates the spot welding between the corbel steel pipe and the connector and saves the subsequent dismantling work, achieving the goal of directly and accurately pre-installing the corbels to the corresponding positions on the steel truss arch rib. This not only improves the assembly speed but also effectively ensures the assembly quality.

[0026] Accordingly, according to the process flow, in order to improve assembly efficiency and reduce auxiliary procedures in the equipment process, this application, when preparing the steel pipe 1, simultaneously cuts out the intersection line that is welded to the left or right arch rib. When aligning the steel pipe installation crosshairs on the qualified left or right arch rib using light measurement, in addition to the center point coinciding, the four directional marking lines on the end of the steel pipe with the intersection line are aligned with the crosshairs on the corresponding arch ribs. Furthermore, considering the existing technology, in order to make the most of existing standard parts, the laser detector 2 described in this application is a laser. The laser is quickly installed inside the prepared qualified steel pipe 1 via an adjustable mounting bracket 4. The adjustable mounting bracket 4 described in this application includes a support fixing rod assembly 5 and an adjustment mechanism 6. The laser is positioned at the geometric center of the adjustment mechanism 6, which is movably supported at the center of the end of the steel pipe to be installed via the support fixing rod assembly 5. At this time, the support and fixing rod assembly 5 includes three sets of self-supporting support and fixing rods 7. Each set of self-supporting support and fixing rods 7, which are evenly distributed circumferentially, is axially reciprocating and movably connected to the adjustment mechanism 6. The free ends of each set of self-supporting support and fixing rods 7, once adjusted and positioned, are supported on the inner wall of the end of the steel pipe to be installed. Each set of self-supporting support and fixing rods 7 includes a self-supporting support base 8, a support connecting rod 9, and a movable adjustment component 10. The movable adjustment component 10 is arranged axially on the support connecting rod 9. The support connecting rod 9, adjusted and positioned by the movable adjustment component 10 in cooperation with the adjustment mechanism 6, is detachably and fixedly connected to the inner wall of the end of the steel pipe to be installed through the self-supporting support base 8. The self-supporting support base 8 is composed of a disc-shaped magnet, and a protective steel shell is wrapped around the outside of the disc-shaped magnet. The free end of the support connecting rod 9 is fixedly connected to the disc-shaped magnet.

[0027] As another important component of this application, the adjustment mechanism 6 includes a mounting frame 11 and an adaptive adjustment component 12. The adaptive adjustment component 12 is arranged inside the mounting frame 11, the laser detector 2 is arranged on the mounting frame 11, and the support connecting rod 9 is arranged on the adjustment mechanism 6 in an axially reciprocating manner through the cooperation of the movable adjustment member 10 with the adaptive adjustment component 12. Specifically, the mounting frame 11 of this application includes a mounting cover plate 13 and a housing 14. The laser detector 2 is arranged on the housing 14, and the housing cover 14 is connected to the mounting cover plate 13. The adaptive adjustment component 12 is arranged in the mounting cavity formed by the housing 14 and the mounting cover plate 13 through the mounting cover plate 13. The adaptive adjustment assembly 12 includes six sets of adaptive adjustment components 15, each set arranged circumferentially on the mounting plate 13. Each support connecting rod 9 is sandwiched between two pairs of four sets of adaptive adjustment components 15, with the geometric center of the mounting plate as the moving support point, via the axial centerline of the movable adjustment component 10. The movable adjustment component 10 of one support connecting rod 9 cooperates with two pairs of four sets of adaptive adjustment components 15 on the same diameter and is arranged axially and reciprocally relative to the mounting frame on the adjustment mechanism 6. More specifically, each set of adaptive adjustment components 15 includes at least one set of rolling support bearings 16, one mounting shaft 17, and one set of adjusting gears 18. The adjusting gears 18 are fixed to the inner ring of the rolling support bearings 16 via the mounting shaft 17. The movable adjustment component 10 is a set of racks arranged axially on two sides of the support connecting rod 9.

[0028] A rolling limit bearing 19 is arranged at the top of each mounting shaft 17, and a blocking limit plate 3 is provided at the end of each support connecting rod 9 that protrudes from the housing. The upper end of the adaptive adjustment assembly 15 is kept stable by the cooperation of the rolling limit bearing 19 and the housing 14.

[0029] In summary, compared with traditional methods and existing technologies, the steel pipe installation and positioning method provided in this application mainly utilizes bidirectional aurora technology for precise alignment of assembly points. Simultaneously, it employs a circular magnetic suction device and synchronous telescopic support rods. These multiple technologies ensure that the aurora beam of the device is parallel to the bracket and located at the center of the bracket's circular tube. Its installation and disassembly are simple and easy to use, achieving precise positioning and installation of the connecting bracket. This eliminates the need for pre-welding and cutting of connecting pipes and brackets during workshop installation, reducing overhead crane usage, thereby reducing labor hours, equipment usage, and auxiliary material consumption. This improves production efficiency and contributes to energy conservation and emission reduction. It also provides a simple and reliable positioning method for on-site bracket installation, ensuring the quality of the pipe truss installation.

[0030] The technical solution of this application will be further described below through specific embodiments:

[0031] In the manufacturing and construction of steel truss structures, the connection between each truss section is mostly achieved by connecting pipes and corbels. Corbel assembly is typically completed in the workshop, but for large trusses, their dimensions often exceed transportation limits, making them unsuitable for transport after corbel installation. Therefore, corbels must be assembled on-site. In the workshop, the assembly and positioning of corbels occupies overhead cranes for extended periods, requiring temporary welding and segmentation of the corbels and connecting pipes. This increases the number of processes, energy consumption, and auxiliary materials required. Segmentation also affects the quality of the beveled joint surface, impacting manufacturing safety. On-site corbel assembly lacks the assembly equipment available in the workshop, making it difficult to guarantee positioning accuracy. To address this technical challenge, a method for installing and positioning corbels in truss structures was developed.

[0032] The present application includes a disc-shaped magnetic support foot, protected by an iron shell of the same shape; a support rod with a rack; a fixing plate at the top of the support rod; a cylindrical outer shell with a rectangular hole; end plates with a laser mounting base and a bearing mounting base; a gear roller shaft that matches the rack of the support rod; and matching bearings.

[0033] First, place the pipe section to be installed horizontally, retract the support rod to the appropriate length, and magnetically attach it to the top of the steel pipe. Then, extend the support rod under its own weight until the other two support rods are magnetically attached to the inner wall of the steel pipe. This further ensures that the device is located on the vertical section of the steel pipe and that the laser line is parallel to the steel pipe.

[0034] Example 1

[0035] Hereinafter, the direction of the support rod's forward and backward movement is called the front-back of the support rod, the two sides of the support rod that contact the rotor are called the left and right sides of the support rod, and the directions of the other two sides of the support rod are called the up and down of the support rod.

[0036] 1. By combining three support rods with six rotors, a "coordinated advance and retreat" configuration is formed, ensuring that the advance and retreat lengths of the three support rods are consistent. This guarantees that the distance from the center point of the device to the steel pipe wall is equal in all directions. Based on the definition of a circle, the device can be located on the vertical section of the pipe. The tooth pitch on the support rods and rotors is 0.5–2 mm. Too small a tooth pitch will result in high resistance and slow speed during the advance and retreat of the support rods, while too large a tooth pitch may lead to reduced accuracy.

[0037] 2. The feet of the support rod are disc-shaped magnets, encased in an iron shell to prevent damage from impacts, allowing for easy magnetic attraction to the steel pipe wall. Since the contact points between the disc-shaped magnets and the pipe wall are always two points on the pipe wall, and these two points are always located on the vertical section of the steel pipe, this further ensures that the device is positioned on the vertical section of the steel pipe. All three disc-shaped magnets are of the same size.

[0038] 3. The support rod is vertically and fixedly connected to the disc-shaped magnet shell, with the centers aligned.

[0039] 4. The three support rods are symmetrically staggered vertically to maintain a balanced load on the rotor during transmission, preventing eccentric load distribution. The first support rod passes through the center of the second support rod, and the second support rod passes through the center of the third support rod, with a 1-2mm gap between them to prevent friction. All three support rods have equal cross-sectional areas, ensuring equal weight. The second and third support rods, now divided into two, are fixed at one end to the magnet housing and at the other end to a 1-2mm thick elliptical iron sheet, thus fixing their spacing.

[0040] 5. The rotor consists of gears and a shaft, which are integrated as a single unit. The length of the gear is flush with or slightly exceeds the length of the third support rod by 1-2 mm. The shaft diameter and length match the inner diameter of the bearing and are fixedly connected to the inner ring of the bearing.

[0041] 6. The outer ring of the bearing is fixed to the annular base on the sealing plate, and the inner ring surface does not contact the sealing plate, with a gap of 1-3mm. The annular base is fixed to the sealing plate. The bearings and sealing plates on the upper and lower sides of the rotor are symmetrically arranged.

[0042] 7. The top and bottom side panels are circular, 1-2mm thick, and have good rigidity.

[0043] 8. The side cylindrical section is 1-2mm thick, providing good rigidity. Rectangular holes, matching the cross-sectional size of the support rods, are cut at the positions of the three support rods, with a 3mm gap larger than the support rods. Small rollers with a diameter of 3mm are installed on the upper and lower sides of the openings, which are used to clamp the support rods from above and below without obstructing their movement.

[0044] 9. The outer center of the sealing plate has a cylindrical base for mounting the laser, with threads on the inside for threaded connection to the laser. The cylindrical base is perpendicular to the sealing plate surface, ensuring that the aurora of the laser is perpendicular to the plane defined by the three support rods after installation.

[0045] 10. When using, first place the pipe section to be installed horizontally, retract the support rod to the appropriate length, first magnetically attach the top of the steel pipe, and then extend the support rod under its own weight until the other two support rods are magnetically attached to the inner wall of the steel pipe. This further ensures that the device is located on the vertical section of the steel pipe and that the laser line is parallel to the steel pipe.

Claims

1. A method for installing and positioning steel pipes for constructing steel structure tubular trusses, comprising the preparation of arch ribs and the preparation of steel pipes (1), characterized in that: The steel pipe installation and positioning method first involves installing a laser detector (2) inside a qualified steel pipe (1) and aligning the measuring light of the laser detector (2) with the axial center line of the steel pipe (1). Then, the measuring light emitted by the laser detector (2) is used to align the steel pipe with the qualified left or right arch rib. Cross lines are installed on the steel pipe marked on the left or right arch rib beforehand. Finally, the steel pipe (1) is positioned and welded to the left or right arch rib to complete the positioning and installation of the steel pipe (1). The laser detector (2) is a laser, which is quickly installed inside the prepared qualified steel pipe (1) via an adjustable mounting bracket (4). The adjustable mounting bracket (4) includes a support and fixing rod assembly (5) and an adjustment mechanism (6). The laser is positioned at the geometric center of the adjustment mechanism (6), which is movably supported at the center of the end of the steel pipe to be installed via the support and fixing rod assembly (5). The support and fixing rod assembly (5) includes three sets of self-supporting support and fixing rods (7). Each set of self-supporting support and fixing rods (7) is circumferentially distributed and axially reciprocatingly connected to the adjustment mechanism (6). The free ends of each set of self-supporting support and fixing rods (7) in position are supported on the inner wall of the end of the steel pipe to be installed. Each set of self-supporting fixing rods (7) includes a self-supporting support base (8), a support connecting rod (9), and a movable adjusting component (10). The movable adjusting component (10) is arranged axially on the support connecting rod (9). The support connecting rod (9) is adjusted into position by the movable adjusting component (10) in cooperation with the adjusting mechanism (6). It is then detachably fixedly connected to the inner wall of the end of the steel pipe to be installed through the self-supporting support base (8). The adjustment mechanism (6) includes a mounting frame (11) and an adaptive adjustment component (12). The adaptive adjustment component (12) is arranged inside the mounting frame (11), the laser detector (2) is arranged on the mounting frame (11), and the support connecting rod (9) is arranged on the adjustment mechanism (6) in an axial reciprocating manner through the cooperation of the movable adjustment component (10) and the adaptive adjustment component (12).

2. The method for installing and positioning steel pipes for constructing steel structure pipe trusses according to claim 1, characterized in that: When preparing the steel pipe (1), the intersection line that is welded to the left or right arch rib is cut out at the same time. When the cross line of the steel pipe is installed, the cross line is aligned on the qualified left or right arch rib by measuring the light. In addition to the center point coinciding, the four directional marking lines of the end of the steel pipe with the intersection line are aligned with the cross line on the corresponding arch rib.

3. The method for installing and positioning steel pipes for constructing steel structure pipe trusses according to claim 1 or 2, characterized in that: The self-supporting base (8) is composed of a disc-shaped magnet. A protective steel shell is wrapped around the outside of the disc-shaped magnet. The free end of the support connecting rod (9) is fixedly connected to the disc-shaped magnet.

4. The method for installing and positioning steel pipes for constructing steel structure pipe trusses according to claim 3, characterized in that: The mounting bracket (11) includes a mounting plate (13) and a housing (14). The laser detector (2) is arranged on the housing (14), which is covered by the mounting plate (13). The adaptive adjustment component (12) is arranged in the mounting cavity formed by the housing (14) and the mounting plate (13) through the mounting plate (13).

5. The method for installing and positioning steel pipes for constructing steel structure pipe trusses according to claim 4, characterized in that: The adaptive adjustment assembly (12) includes six sets of adaptive adjustment components (15). Each set of adaptive adjustment components (15) is arranged circumferentially on the mounting plate (13). Each support connecting rod (9) is sandwiched between two pairs of four sets of adaptive adjustment components (15) with the geometric center of the mounting plate as the moving support point through the axial center line of the moving adjustment component (10). The moving adjustment component (10) of one support connecting rod (9) is arranged on the adjustment mechanism (6) in a reciprocating manner relative to the mounting frame along the axial direction, cooperating with two pairs of four sets of adaptive adjustment components (15) on the same diameter.

6. The method for installing and positioning steel pipes for constructing steel structure pipe trusses according to claim 5, characterized in that: Each set of adaptive adjustment components (15) includes at least one set of rolling support bearings (16), one mounting shaft (17), and one set of adjusting gears (18). The adjusting gears (18) are fixed to the inner ring of the rolling support bearings (16) via the mounting shaft (17). The movable adjustment component (10) is a set of racks arranged axially on both sides of the support connecting rod (9). A rolling limit bearing (19) is arranged at the top of each mounting shaft (17), and a blocking limit plate (3) is provided at the end of each support connecting rod (9) that protrudes from the housing. The upper end of the adaptive adjustment assembly (15) is kept stable by the cooperation of the rolling limit bearing (19) and the housing (14).

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