Precise assembly and performance detection method for multi-stage large-size sleeve structure

Abstract

The invention discloses a precise assembly and performance detection method for a multi-stage large-size sleeve structure. According to the method, equipment comprises a supporting platform, a lifting mechanism, an operation platform, a gantry support and a laser tracker. Firstly, a sleeve is placed on a supporting platform, a lifting mechanism is placed below the supporting platform, an operation platform is placed on the upper plane of the lifting mechanism and fixedly connected, and a laser tracker is fixed to a gantry support; the operating platform axially moves along the interior of the sleeve along with the lifting mechanism to assemble parts; and an internal operation area of the sleeve is uniformly divided into multiple quadrants for assembly and fine adjustment, assembly of each quadrant is carried out in sequence, and the situation is judged through a laser tracker for fine adjustment until precise assembly and detection of the multi-stage sleeve structure are completed. The situation that the precision is reduced due to deviation of the part assembly position degree after acting force is removed due to the fact that the part deforms when acting force is applied to the sleeve in the assembly process is effectively avoided, the part assembly position degree does not need to be detected after personnel withdraw, and the assembly precision and efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the field of assembly process technology, and in particular to a precision assembly and detection method for a large-size thin-walled sleeve structure. Background Art

[0002] At present, with the development of space technology applications, aerospace payloads have put forward urgent requirements for the large-scale basic bearing structures and mechanisms. Limited by the rocket carrying space, a multi-stage large-size extendable sleeve structure can be used as the main supporting structure for aerospace payloads in space because of its large expansion and contraction ratio.

[0003] Taking satellite antennas as an example, the larger the extension size, the larger the antenna size that can be carried. Compared with fixed support structures, multi-stage sleeves are more conducive to improving communication effects. The processing and assembly accuracy of multi-stage sleeves will directly affect the deployment accuracy of the product. However, due to the requirements of lightweight spacecraft structures, the sleeve structure has the characteristics of thin walls, large aspect ratio, small implementation space, and high assembly accuracy. Therefore, there are difficulties such as weak rigidity, difficult support, and difficult to ensure assembly accuracy in a small space. Summary of the invention

[0004] The technical problem solved by the present invention is to overcome the difficulties of weak rigidity and difficulty in supporting large-sized sleeve structures, and difficulty in ensuring assembly accuracy in narrow spaces, and to provide a single-stage and multi-stage large-sized thin-walled sleeve structure precision assembly and performance testing method.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] One of the technical solutions of the present invention is: a method for precision assembly and detection of a single-stage large-size thin-walled sleeve, the method relies on equipment including a pulley, a parallel guide rail, a laser tracker, and a rolling support assembly, and includes the following steps:

[0007] Step 1: Place the single-stage sleeve to be assembled horizontally and support and fix it through a rolling support assembly, insert the parallel guide rail into the single-stage sleeve along the axial direction and fix it at both ends, place the pulley on the parallel guide rail, and place a laser tracker at the axial front end of the single-stage sleeve;

[0008] Step 2: Evenly divide the internal component operation area of ​​the single-stage sleeve into multiple quadrants, and the operating pulley moves axially on the parallel guide rails to enter the interior of the single-stage sleeve;

[0009] Step 3: assembling parts in the operable quadrant inside the single-stage sleeve. After assembly, the assembly status of the parts is scanned and determined by a laser tracker. If the scanning result does not meet the requirements, the parts in the quadrant are fine-tuned until the scanning result of the parts in the quadrant meets the assembly requirements. If the scanning result meets the requirements, a thrust is applied to the outer wall of the single-stage sleeve to make it rotate circumferentially around the axis to the next quadrant.

[0010] Step 4: Repeat step 3 until the assembly and fine-tuning process of the parts in all quadrants inside the single-stage sleeve is completed.

[0011] Preferably, the rolling support assembly contacts the outer wall of the single-stage sleeve through rollers, and rolling friction causes the single-stage sleeve to rotate circumferentially around the axis; rollers are arranged on both sides of the bottom of the pulley to contact parallel guide rails; the laser tracker is located in front of the operating area of ​​the single-stage sleeve, covers the operating area for detection during the assembly process, and is used to determine the straightness of the assembled parts.

[0012] Preferably, the internal component operation area of ​​the single-stage sleeve is evenly divided into 6 quadrants.

[0013] The second technical solution of the present invention is to provide a method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure, wherein the multi-stage large-size thin-walled sleeve structure is formed by connecting a plurality of single-stage large-size thin-walled sleeves, and the method relies on equipment including a laser tracker, a gantry bracket, a support platform, a lifting mechanism, and an operating platform, and includes the following steps:

[0014] Step 1: Place the single-stage sleeve in a completely vertical state on a supporting platform with a round hole in the middle, place the operating platform on the upper plane of the lifting mechanism and connect and fix it, place the operating platform and the lifting mechanism under the supporting platform, and the operating platform passes through the supporting platform to enter the inside of the single-stage sleeve. The laser tracker is placed above the single-stage sleeve in a vertical state and fixed on the gantry bracket, and the detection area completely covers the assembly position of the internal parts of the single-stage sleeve;

[0015] Step 2: Evenly divide the internal component operation area of ​​the single-stage sleeve in a vertical state into multiple quadrants, and adjust the height of the operation platform through the lifting mechanism so that the operation platform can reach all component assembly operation areas;

[0016] Step 3: The parts are assembled in the operable quadrant inside the single-stage sleeve. After assembly, the assembly status of the parts is scanned and determined by a laser tracker. When the scanning result does not meet the requirements, the parts in the quadrant are fine-tuned until the scanning result of the parts in the quadrant meets the assembly requirements. When the scanning result meets the requirements, the operating platform cooperates with the lifting mechanism to move to the next quadrant parts operation area;

[0017] Step 4: Repeat step 3 until the assembly and fine adjustment of parts in all quadrants of the single-stage sleeve in the vertical state are completed;

[0018] Step 5: Place the single-stage sleeve to be assembled inside the assembled single-stage sleeve to form a multi-stage sleeve structure in a contracted state, and perform steps 2 to 4 on the single-stage sleeve to be assembled;

[0019] Step 6: Repeat step 5 until the multi-stage sleeve structure in the contracted state completes the assembly and fine-tuning process;

[0020] Step 7: Replace the gantry bracket with a large gantry bracket and place the laser tracker on a fixed platform;

[0021] Step 8: The multi-stage sleeve structure is fully deployed, and the laser tracker detects the deployment performance of the multi-stage sleeve structure. The sleeve and specific position of the parts that need to be fine-tuned are determined based on the judgment results;

[0022] Step 9: The multi-stage sleeve structure in the expanded state is retracted to the position where the sleeve where the component to be fine-tuned is located is at the bottom, and the lifting mechanism lifts the operating platform to the position of the component to be fine-tuned for fine-tuning;

[0023] Step 10: Repeat steps 8 to 9 until the laser tracker detects that the deployment performance of the multi-stage sleeve structure meets the requirements.

[0024] Preferably, the outer envelope size of the operating platform is 30 to 50 mm smaller than the inner diameter of the single-stage sleeve to be assembled. A pair of handrails are arranged on the top of the operating platform to assist the assembly process. The bottom of the operating platform is connected and fixed to the upper plane of the lifting mechanism by fasteners. It moves up and down with the lifting mechanism. The moving height covers all operating areas of the single-stage large-size thin-walled sleeve to be assembled.

[0025] Preferably, when detecting the assembly status of parts of a single-stage large-size thin-walled sleeve, the laser tracker is fixed on the gantry bracket by hanging, and the center of the laser tracker's rotation axis coincides with the axis of the single-stage sleeve. When detecting the deployment performance of a multi-stage sleeve structure, the laser tracker is placed on a fixed platform and the placement distance is adjusted until the detection range can completely cover the multi-stage sleeve structure in a full-size deployed state.

[0026] Preferably, the large gantry bracket has a rigidity that satisfies the support strength and size requirements of the multi-stage large-size thin-walled sleeve structure in a fully expanded state.

[0027] Preferably, in the multi-stage large-size thin-walled sleeve structure, parallel guide rails and pulley devices are installed between the single-stage large-size thin-walled sleeves, the sleeves are connected in a nested manner, and a steel wire rope of the same specification is hung on the outer wall of each single-stage sleeve.

[0028] Preferably, when testing the deployment performance of the multi-stage sleeve structure, the tension of the wire rope cooperates with the gravity of the single-stage sleeve to realize the full-size deployment of the multi-stage sleeve structure step by step. After deployment, each wire rope is fixed on the gantry bracket, and the laser tracker detects the deployment performance of the multi-stage sleeve. After the positions of the components to be fine-tuned of the multi-stage sleeve structure are determined by the test results, the tension of the wire rope is reduced to retract the single-stage sleeve where the components to be fine-tuned are located to the lowermost position, forming a partially retracted state of the multi-stage sleeve structure, the wire rope is fixed on the gantry bracket, and the lifting mechanism lifts the operating platform to the position of the components to be fine-tuned for fine-tuning.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a method for precise assembly and inspection of a single-stage large-size thin-walled sleeve structure. When the single-stage sleeve is placed horizontally, an operator or other operating equipment such as a manipulator lies flat on a pulley and enters the interior of the sleeve along parallel guide rails to perform component assembly. This avoids the deformation of components due to the application of force during the assembly process, which results in deviation in the assembly position of components and reduced accuracy after the force is removed. During the assembly process, fine-tuning of components is performed based on real-time detection results of a laser tracker in front of the operating area, thereby achieving the goal of not requiring an operator or other operating equipment such as a manipulator to withdraw from the sleeve structure for the inspection process.

[0031] The present invention provides a method for precise assembly and performance testing of a multi-stage large-size thin-walled sleeve structure. A single-stage sleeve in a vertical state is not affected by gravity and recovers to a free state along the diameter direction. A lifting mechanism lifts an operating platform to enter the interior of the sleeve to implement assembly and fine-tuning processes, thereby avoiding the situation in which force is applied to parts during operation, resulting in reduced assembly accuracy. A laser tracker is placed above the multi-stage sleeve structure to completely cover the operating range of the parts for precision testing. A steel wire rope is hung on the outer wall of the sleeve to adjust the expansion and contraction states of the multi-stage sleeve structure, so that operators or other operating equipment such as manipulators can always be located on the operating platform to perform fine-tuning of parts of the multi-stage sleeve structure and the expansion performance testing process, thereby improving assembly accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of horizontal assembly and detection of a sleeve provided by an embodiment of the present invention;

[0034] Figure 2is a schematic diagram of the connection relationship between the pulley and the parallel guide rails provided in an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of vertical assembly and detection of a sleeve provided by an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of vertical assembly and detection of a sleeve provided by an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of multi-stage sleeve detection in a full-size deployed state provided by an embodiment of the present invention.

[0038] Explanation of the reference numerals: 1-pulley, 2-parallel guide rails, 3-single-stage sleeve, 4-laser tracker, 5-rolling support assembly, 6-gantry bracket, 7-support platform, 8-operating platform, 9-lifting mechanism, 10-large gantry bracket, 11-multi-stage sleeve structure, 12-fixed platform, 13-wire rope. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] The present invention provides an embodiment of a single-stage large-size thin-walled sleeve structure precision assembly and detection method, such as Figure 1 As shown, the method relies on equipment including a pulley 1, a parallel guide rail 2, a laser tracker 4, and a rolling support assembly 5, and specifically includes the following steps:

[0041] Step 1: Place the single-stage sleeve 3 horizontally, the rolling support assembly 5 supports and fixes the single-stage sleeve 3 and contacts its outer wall through rollers, and realizes the circumferential rotation of the single-stage sleeve 3 around the axis through rolling friction, and inserts the parallel guide rail 2 into the single-stage sleeve 3 along the axial direction and fixes it at both ends, and the pulley 1 is placed on the parallel guide rail 2, as shown in FIG. Figure 2 As shown, rollers are arranged on both sides of the bottom of the pulley 1 to contact the parallel guide rails 2, and a laser tracker 4 is arranged at the axial front end of the single-stage sleeve 3 to determine the straightness of the assembled parts;

[0042] Step 2: Evenly divide the internal parts operation area of ​​the single-stage sleeve 3 into multiple quadrants (evenly divided into 6 quadrants in this embodiment), and the operator lies flat on the pulley 1 and moves axially into the sleeve by holding the parallel guide rail 2;

[0043] Step 3: The operator assembles the parts of the operable quadrant inside the single-stage sleeve 3. After assembly, the laser tracker 4 scans and determines the assembly status of the parts. When the scanning result does not meet the requirements, the operator fine-tunes the parts in the quadrant until the scanning result of the parts in the quadrant meets the assembly requirements. When the scanning result meets the requirements, the auxiliary operator applies a thrust to the outer wall of the single-stage sleeve 3 to make it rotate circumferentially around the axis to the next quadrant;

[0044] Step 4: Repeat step 3 until the assembly and fine-tuning process of the parts in all quadrants of the single-stage sleeve 3 is completed.

[0045] The present invention also provides an embodiment of a method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure, wherein a plurality of single-stage large-size thin-walled sleeves are connected into a multi-stage large-size thin-walled sleeve structure, and precision assembly and performance testing are performed on the structure. The method relies on equipment including a laser tracker 4, a gantry bracket 6, a support platform 7, a lifting mechanism 9, an operating platform 8, a large gantry bracket 10, a fixed platform 12, and a steel wire rope 13, and specifically includes the following steps:

[0046] Step 1: Vertical assembly and test equipment installation Figure 3 As shown, the single-stage sleeve 3 in a completely vertical state is placed on a supporting platform 7 with a circular hole in the middle. Compared with the horizontal state, the single-stage sleeve 3 in the vertical state is not affected by gravity and is restored to a free state along the diameter direction. The operating platform 8 is placed on the upper plane of the lifting mechanism 9 and is fixed by fasteners, as shown in FIG. Figure 4 As shown, an operating platform 8 and a lifting mechanism 9 are placed under a supporting platform 7, a laser tracker 4 is placed above a single-stage sleeve 3 in a vertical state, and is fixed on a gantry bracket 6 in a hanging manner, the rotating axis center of the laser tracker 4 coincides with the axis of the single-stage sleeve 3, and the detection area completely covers the internal component assembly position of the single-stage sleeve 3 in a vertical state;

[0047] Step 2: Evenly divide the internal component operation area of ​​the single-stage sleeve 3 in the vertical state into multiple quadrants (evenly divided into 6 quadrants in this embodiment), and adjust the height of the operating platform 8 through the lifting mechanism 9 so that the moving height of the operating platform can cover all component assembly operation areas;

[0048] Step 3: The operator performs the assembly process of the parts in the operable quadrant inside the single-stage sleeve 3. After the assembly, the laser tracker 4 is used to scan and determine the assembly status of the parts. When the scanning result does not meet the requirements, the operator fine-tunes the parts in the quadrant until the scanning result of the parts in the quadrant meets the assembly requirements. When the scanning result meets the requirements, the operator is located on the operating platform 8 and moves with the lifting mechanism 9 to the next quadrant operating area to perform the parts assembly process;

[0049] Step 4: Repeat step 3 until the assembly and fine adjustment of parts in all quadrants of the single-stage sleeve 3 in the vertical state are completed;

[0050] Step 5: Place the single-stage sleeve 3 to be assembled inside the assembled single-stage sleeve 3 to form a multi-stage sleeve structure 11 in a contracted state, install parallel guide rails and pulley devices between the single-stage sleeves 3, and connect them in a nested manner, and perform steps 2 to 4 on the single-stage sleeve 3 to be assembled;

[0051] Step 6: Repeat step 5 until the multi-stage sleeve structure 11 in the contracted state completes the assembly and fine-tuning process;

[0052] Step 7: Replace the gantry bracket 6 with a large gantry bracket 10, such as Figure 5 As shown, the rigidity of the large gantry bracket 10 meets the support strength and size requirements of the multi-stage sleeve structure 11 in the full-size expanded state. The laser tracker 4 is placed on the fixed platform 12 and the placement distance is adjusted until the detection range can completely cover the multi-stage sleeve structure 11 in the full-size expanded state. A steel wire rope of the same specification is hung on the outer wall of each single-stage sleeve 3, and the steel wire rope cooperates with the sleeve gravity to adjust the expansion and contraction state of the multi-stage sleeve structure 11.

[0053] Step 8: Pull the steel wire rope step by step, fully unfold the multi-stage sleeve structure 11, and fix the steel wire rope on the gantry bracket. The laser tracker 4 detects the performance of the multi-stage sleeve structure 11 in full-scale unfolding, and determines the sleeve and specific position of the parts that need to be fine-tuned according to the judgment situation;

[0054] Step 9: Reduce the tension of the wire rope to shrink the multi-stage sleeve structure 11 until the sleeve where the component to be fine-tuned is located is at the lowest position, and the operator is on the operating platform 8 and follows the lifting mechanism 9 to the position of the component to be fine-tuned to perform fine adjustment;

[0055] Step 10: Repeat steps 8 to 9 until the laser tracker 4 detects that the deployment performance of the multi-stage sleeve structure 11 meets the requirements.

[0056] The outer envelope size of the operating platform is 30 to 50 mm smaller than the inner diameter of the single-stage sleeve to be assembled, and a pair of handrails are arranged on the top of the operating platform to assist the assembly process.

[0057] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A precision assembly and detection method for a single-stage large-size thin-walled sleeve, characterized in that: The method relies on equipment including a pulley, parallel guide rails, a laser tracker, and a rolling support assembly, and includes the following steps: S1. Place the single-stage sleeve to be assembled horizontally and support and fix it through a rolling support assembly, insert the parallel guide rail into the single-stage sleeve along the axial direction and fix it at both ends, place the pulley on the parallel guide rail, and place a laser tracker at the axial front end of the single-stage sleeve; S2, evenly dividing the internal parts operation area of ​​the single-stage sleeve into multiple quadrants, and the operating pulley moves axially along the parallel guide rails into the interior of the single-stage sleeve; S3, assembling parts in the operable quadrant inside the single-stage sleeve. After assembly, the laser tracker is used to scan and determine the assembly status of the parts. If the scanning result does not meet the requirements, the parts in the quadrant are fine-tuned until the scanning result of the parts in the quadrant meets the assembly requirements. If the scanning result meets the requirements, a thrust is applied to the outer wall of the single-stage sleeve to make it rotate circumferentially around the axis to the next quadrant; S4, repeat S3 until the assembly and fine adjustment process of the parts in all quadrants inside the single-stage sleeve is completed.

2. A single-stage large-size thin-walled sleeve precision assembly and detection method as claimed in claim 1, characterized in that: The rolling support assembly contacts the outer wall of the single-stage sleeve through rollers, and causes the single-stage sleeve to rotate circumferentially around the axis through rolling friction; rollers are arranged on both sides of the bottom of the pulley to contact the parallel guide rails; the laser tracker is located in front of the single-stage sleeve operating area, covers the operating area for detection during the assembly process, and is used to determine the straightness of the assembled parts.

3. A single-stage large-size thin-walled sleeve precision assembly and detection method as claimed in claim 1, characterized in that: The operating area of ​​the internal parts of the single-stage sleeve is evenly divided into 6 quadrants.

4. A method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure, wherein the multi-stage large-size thin-walled sleeve structure is formed by connecting multiple single-stage sleeves, characterized in that: The method relies on equipment including a laser tracker, a gantry bracket, a support platform, a lifting mechanism, and an operating platform, and includes the following steps: S1. Place the single-stage sleeve in a completely vertical state on a supporting platform with a circular hole in the middle, place the operating platform on the upper plane of the lifting mechanism and connect and fix it, place the operating platform and the lifting mechanism under the supporting platform, and let the operating platform pass through the circular hole in the middle of the supporting platform to enter the inside of the single-stage sleeve. Place the laser tracker above the single-stage sleeve in a vertical state and fix it on the gantry bracket, and the detection area completely covers the assembly position of the internal parts of the single-stage sleeve; S2, evenly dividing the internal parts operation area of ​​the single-stage sleeve in a vertical state into multiple quadrants, and adjusting the height of the operation platform through the lifting mechanism so that the operation platform can reach all parts assembly operation areas; S3, assembling parts in the operable quadrant inside the single-stage sleeve. After assembly, the laser tracker is used to scan and determine the assembly status of the parts. If the scanning result does not meet the requirements, the parts in the quadrant are fine-tuned until the scanning result of the parts in the quadrant meets the assembly requirements. If the scanning result meets the requirements, the operating platform cooperates with the lifting mechanism to move to the next quadrant operating area; S4, repeat S3 until the assembly and fine adjustment of parts in all quadrants of the single-stage sleeve in the vertical state are completed; S5, placing the single-stage sleeve to be assembled inside the assembled single-stage sleeve to form a multi-stage sleeve structure in a contracted state, and performing operations S2 to S4 on the single-stage sleeve to be assembled; S6, repeat S5 until the multi-stage sleeve structure in the contracted state completes the assembly and fine adjustment process; S7, placing a laser tracker on a fixed platform, and detecting the deployment performance of the multi-stage sleeve structure by the laser tracker; S8. Full-size unfolding of the multi-stage sleeve structure, and determining the sleeve and specific position of the parts that need fine-tuning based on the detection results of the laser detector; S9, retracting the multi-stage sleeve structure in the expanded state to the position where the sleeve of the component to be finely adjusted is at the bottom, and the lifting mechanism lifts the operating platform to the position of the component to be finely adjusted to perform fine adjustment; S10, repeat S8 to S9 until the laser tracker detects that the deployment performance of the multi-stage sleeve structure meets the requirements.

5. A method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure as claimed in claim 4, characterized in that: The outer envelope size of the operating platform is 30 to 50 mm smaller than the inner diameter of the single-stage sleeve to be assembled. A pair of handrails are arranged on the top of the operating platform to assist the assembly process. The bottom of the operating platform is connected and fixed to the upper plane of the lifting mechanism by fasteners. It moves up and down with the lifting mechanism, and the moving height covers all operating areas of the single-stage sleeve to be assembled.

6. A method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure as claimed in claim 4, characterized in that: When detecting the assembly status of the parts of a single-stage sleeve, the laser tracker is fixed on the gantry bracket by hanging, and the center of the laser tracker's rotation axis coincides with the axis of the single-stage sleeve. When detecting the deployment performance of a multi-stage sleeve structure, the laser tracker is placed on a fixed platform and the placement distance is adjusted until the detection range can completely cover the multi-stage sleeve structure in a full-size deployed state.

7. A method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure as claimed in claim 4, characterized in that: In S7, the gantry bracket is replaced with a large gantry bracket, which meets the support strength and size requirements of the multi-stage large-size thin-walled sleeve structure in the full-size expanded state.

8. A method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure as claimed in claim 4, characterized in that: In the multi-stage large-size thin-wall sleeve structure, parallel guide rails and pulley devices are installed between the single-stage sleeves and are connected in a nested manner. The outer wall of each single-stage sleeve is hung with a steel wire rope of the same specification.

9. A method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure as claimed in claim 8, characterized in that: When testing the deployment performance of the multi-stage sleeve structure, the steel wire rope is pulled step by step. The steel wire rope tension cooperates with the gravity of the single-stage sleeve to realize the full-size deployment process of the multi-stage sleeve structure. After full-size deployment, the steel wire rope is fixed on the gantry bracket, and the laser tracker is used to detect the deployment performance of the multi-stage sleeve.

10. A method for precision assembly and performance testing of a multi-stage large-size thin-walled sleeve structure as claimed in claim 8, characterized in that: After determining the position of the components to be fine-tuned in the multi-stage sleeve structure through the detection results of the laser tracker, reduce the tension of the wire rope to shrink the single-stage sleeve where the components to be fine-tuned are located to the lowest position, fix the wire rope on the gantry bracket, and lift the operating platform of the lifting mechanism to the position of the components to be fine-tuned for fine-tuning.

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