Garment repairing platform

Through the combination of backlight perspective method and the open shaft body, the clothing is inspected by using LED flat lamps and open shaft body, which solves the problem of difficulty in detecting local thinning or fiber breakage in the prior art, and achieves efficient and accurate clothing damage detection.

CN120291335APending Publication Date: 2025-07-11ZHEJIANG TEXTILE & FASHION COLLEGE
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Patent Information

Application Number
CN202510493611.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-17
Publication Date
2025-07-11

AI Technical Summary

Technical Problem

When inspecting clothing, it is difficult to detect local areas thinning or fiber breakage in time, and the inspection quality and efficiency are low.

Method used

The backlight perspective method is used to combine the LED flat lamp and the open shaft body to penetrate the clothing through parallel light, use the difference in light penetration to detect damage, and perform a secondary light transmission inspection by stretching the open shaft body to carry out the clothing.

Benefits of technology

It improves the quality and efficiency of clothing inspection, can promptly detect potential fiber damage of clothing, reduce interference factors, and improve judgment accuracy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of garment repair, in particular to a garment repair platform, which comprises a positioning ring, an assembly plate rotationally arranged in the positioning ring and two assembly seats assembled on the outer wall of the assembly plate, one assembly seat is slidably designed on the outer wall of the assembly plate, and the other assembly seat is fixed on the outer wall of the assembly plate. The two assembling bases are each provided with an opening shaft body. A transparent cover is slidably mounted on the outer wall of the assembly plate between the two assembly seats, and an LED panel lamp is mounted in the transparent cover; the clothes are arranged on the two opening shaft bodies in a sleeving mode, the transparent cover is located in the clothes and provides parallel light for the two opening planes, a stroke groove is formed in the assembly plate, a magnetic strip is laid at the inner bottom of the stroke groove, and a magnetic sliding block is installed in the stroke groove in a sliding mode. Regional thinning and damage of the garment fabric can be checked by adopting a backlighting perspective method, and the garment can be stretched for secondary light transmission so as to expose potential fiber damage of the garment.
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Description

Technical Field

[0001] The present invention relates to the technical field of clothing repair, and specifically to a clothing repair platform. Background Art

[0002] After inspecting the appearance or quality of fabrics such as clothing, it is necessary to repair appearance defects or quality defects. At this time, a repair platform is required to provide equipment support for the operation of staff, such as ultrasonic cleaning guns, alcohol disinfection guns, or sewing needles.

[0003] In the prior art, when inspecting clothing, it is judged whether there are defects in the clothing through manual observation or skin touch. Manual observation can quickly confirm obvious places, but in the face of the situation where a local area becomes thinner or the fibers are broken, it is difficult to detect and repair in time, and the inspection quality and efficiency are low. Summary of the Invention

[0004] The present invention provides a clothing repair platform, which can use the backlight perspective method to inspect the thinning and damage of the clothing fabric area, and can also stretch the clothing for secondary light transmission to expose potential fiber damage of the clothing.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A clothing repair platform, comprising:

[0007] A positioning ring and an assembly plate rotatable inside it, two assembly seats assembled on the outer wall of the assembly plate, one of the assembly seats is slidably designed on the outer wall of the assembly plate, and the other assembly seat is fixed on the outer wall of the assembly plate. Both of the assembly seats are provided with a spreading shaft body; a transparent cover is slidably installed on the outer wall of the assembly plate between the two assembly seats, and an LED flat lamp is installed inside the transparent cover; the clothing is sleeved on the two spreading shaft bodies. At this time, the transparent cover is located inside the clothing and provides parallel light to the two spreading planes.

[0008] Optionally, a travel groove is opened on the assembly plate, a magnetic strip is laid on the inner bottom of the travel groove, a magnetic slider is slidably installed inside the travel groove, one of the slidable assembly seats is fixedly installed on the magnetic slider, and clamping devices are installed on both of the assembly seats, and the clamping devices can apply flexible clamping to the clothing on the spreading shaft body.

[0009] Optionally, a limiting groove is opened on the inner wall of the positioning ring, two pin shafts are fixedly installed on the outer wall of the assembly plate, the two pin shafts are symmetrically distributed, the pin shafts are slidably and rotatably assembled on the inner wall of the limiting groove, and a locking member for restricting the sliding of one of the pin shafts is installed on the outer wall of the positioning ring.

[0010] Optionally, the locking element includes a linkage shaft body rotatably mounted on the outer wall of the positioning ring, the linkage shaft body having an inner cavity, a square lock tongue being slidably mounted in the inner cavity, a spring being installed between the square lock tongue and the inner cavity, the square lock tongue being able to slide along the radial direction of the positioning ring, the square lock tongue being stuck in the lock hole under the tension of the spring, the outer wall of the square lock tongue being designed with a chamfer, and when the pin shaft is forced to slide in the limit groove, the chamfer can be used to force the square lock tongue to retract into the inner cavity, thereby releasing the limitation of the square lock tongue on the pin shaft.

[0011] Optionally, a portion of the outer wall of the linkage shaft is designed with a spiral tooth surface, and a worm gear is rotatably mounted on the outer wall of the positioning ring, and the worm gear is meshingly connected with the spiral tooth surface.

[0012] Optionally, the clamp includes a supporting plate installed on the assembly seat and the limiting groove, the outer wall of the supporting plate is equipped with an electric telescopic rod, the output end of the electric telescopic rod is fixedly installed with a clamping plate, the clamping plate is located on the side of the support shaft away from the transparent cover, and the outer wall of the clamping surface of the clamping plate is designed to be arc-shaped.

[0013] Optionally, the outer wall of the expanded shaft body is designed with rounded corners, and the outer wall of the expanded shaft body is surrounded by a silicone sleeve with uniform thickness, and the rounded corners of the silicone sleeve are adapted to the arc-shaped outer wall of the splint.

[0014] Optionally, the horizontal central axes of the transparent cover and the support shaft are both colinear with the sliding path of the assembly seat, and the height of the silicone sleeve in the vertical direction is smaller than the height of the transparent cover in the vertical direction.

[0015] Optionally, the outer wall of the mounting seat in a fixed state is detachably mounted with two fill lights, the two fill lights are symmetrically distributed along the horizontal center axis of the open shaft, and the parallel light emitted by the two fill lights is respectively located on the upper and lower surfaces of the open shaft.

[0016] The present invention provides a clothing repair platform, which has the following beneficial effects compared with the prior art:

[0017] First, the present invention can provide uniform penetrating light for the flat fabric through the cooperation between the LED flat lamp and the expansion shaft. Secondly, the fabric is jointly mounted on the two expansion shafts to ensure that the clothing is expanded while maintaining uniform flatness, thereby improving the inspection quality and efficiency. Thirdly, the two expansion shafts expand the clothing, thereby dividing the clothing into two layers, the upper and lower layers. Compared with the double-layer flat laying in the prior art, the interference factors caused by the double layer can be reduced, which is convenient for the staff to make accurate and efficient judgments.

[0018] Second, by designing the relative displacement of the two stretching shafts, the clothing can be stretched, allowing light to penetrate the clothing better. It can re-inspect uncertain areas, and can also stretch the suspected damage area locally and then transmit light again to observe whether the light transmission range expands to judge whether there is a risk of damage spread.

[0019] Third, through the cooperation between the locking part and the pin shaft, the angle between the flat surface of the clothing and the viewing angle of the staff can be adjusted, improving the observation effect of the staff and avoiding the reflection interference caused by vertical downward viewing.

[0020] Fourth, through the cooperation between the clamp and the stretching shaft body, when the clamping plate approaches the stretching shaft body, the clothing fabric can be clamped and limited, avoiding the clothing shrinking together due to the elastic properties of the fabric, affecting the flat-laying quality, and avoiding the displacement of the clothing fabric, affecting the observation.

[0021] Fifth, by designing the side light distribution, filling light and illuminating from the side of the clothing, the blocking shadows caused by the protrusions on the surface of the clothing fabric are highlighted, strengthening the surface texture and three-dimensional details, converting the invisible microscopic deformation into a visual light and shadow signal, making up for the deficiencies of traditional vertical light or backlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic three-dimensional structure diagram of the exterior of the present invention;

[0023] Figure 2 is a schematic three-dimensional structure diagram of the interior of the present invention;

[0024] Figure 3 is the present invention Figure 1 right view structure diagram;

[0025] Figure 4 is the present invention along Figure 3 cross-sectional structure diagram taken at A-A in;

[0026] Figure 5 is the present invention Figure 1 front view structure diagram;

[0027] Figure 6 is a schematic three-dimensional structure diagram of the assembly plate and the parts thereon in the present invention;

[0028] Figure 7 is a schematic three-dimensional structure diagram of the locking part and the pin shaft in the present invention.

[0029] In the figure: 1, positioning ring; 2, assembly plate; 3, transparent cover; 4, LED flat lamp; 5, clamping plate; 6, stretching shaft body; 7, bearing plate; 8, assembly seat; 9, limit groove; 11, travel groove; 12, pin shaft; 13, lock hole; 14, square lock tongue; 15, linkage shaft body; 16, worm gear; 17, supplementary light lamp. Detailed implementation mode

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a clothing repair platform, including:

[0032] A positioning ring 1 and an assembly plate 2 rotatable inside it, two assembly seats 8 assembled on the outer wall of the assembly plate 2, one of the assembly seats 8 being slidably designed on the outer wall of the assembly plate 2, and the other assembly seat 8 being fixed on the outer wall of the assembly plate 2. Opening shafts 6 are designed on both assembly seats 8; A transparent cover 3 is slidably installed on the outer wall of the assembly plate 2 between the two assembly seats 8, and an LED flat lamp 4 is installed inside the transparent cover 3; The clothing is sleeved on the two opening shafts 6. At this time, the transparent cover 3 is located inside the clothing and provides parallel light to the two opening planes.

[0033] The backlight perspective method is a method that uses light to penetrate fabrics and observes the difference in light transmission to quickly detect damage or aging of clothing. It is particularly suitable for finding thinning areas that are difficult to see with the naked eye, hidden holes or internal structural damage. In the prior art, the density of the fabric affects the penetration and scattering of light. If it is a complete fabric, the fibers are tightly interwoven, the light is scattered multiple times between the fibers, and the light transmission is uniform and soft. If the light transmission is found to be uneven in brightness or diffuse bright areas and blurred edges, it can be determined that the thickness of the fabric is uneven and may be locally thinned. If the fabric has a damaged area, after the fibers are broken or worn, the density of the fabric is reduced, the scattering of light when penetrating is reduced, the amount of light transmission is increased, and bright spots are formed, which is more helpful for staff to quickly check and judge. In this case, in order to assist staff to better identify thinning areas or damage, this case uses LED flat panel lights 4, which can evenly emit parallel light sources with a color temperature of 4000 to 6500K, and the specific color temperature of the LED flat panel lights 4 can adjust the color temperature and brightness according to the different fabrics, so as to provide uniform penetrating light for the flat fabric. Secondly, in order to make the clothing fabric lay flatter, two stretching shafts 6 are used, and the fabric is mounted on the two stretching shafts 6, one of which is away and the other is kept closed, so as to ensure that the clothing is stretched and kept evenly flat, thereby improving the inspection quality and efficiency. Secondly, the two stretching shafts 6 stretch the clothing, thereby dividing the clothing into two layers, the upper and lower layers. Compared with the double-layer flat laying in the prior art, it can reduce the interference factors caused by the double layer, which is convenient for the staff to make accurate and efficient judgments.

[0034] Among them, a more preferred embodiment is that a travel groove 11 is opened on the assembly plate 2, and a magnetic strip is laid on the inner bottom of the travel groove 11. A magnetic slider is slidably installed inside the travel groove 11, and one of the slidable assembly seats 8 is fixedly installed on the magnetic slider. Both assembly seats 8 are equipped with clamps, and the clamps can apply flexible clamping to the clothing on the support shaft 6. In this embodiment, a magnetic suction track is formed between the travel groove 11 and the magnetic strip, and the base of the assembly seat 8 is connected to the magnetic slider. The travel groove 11 provides guidance and limitation for the displacement of the magnetic slider, and the magnetic suction cooperation can quickly adjust the position of the assembly seat 8, so that the assembly seat 8 can stay at any position on the travel groove 11, and then the displacement of the support shaft 6 is used to stretch the clothing. After the clothing is stretched, light can pass through the clothing better, and uncertain places can be re-inspected. It is also possible to stretch the suspected damaged area locally and let light pass again to observe whether the light transmission range is expanded to determine whether there is a risk of damage spread.

[0035] The principle of stretching and then transmitting light is mainly as follows: stretching expands the gaps between fabric fibers, and the originally closed micro-cracks open under tension. When backlit, bright light lines are formed. For example, the fibers of a woolen sweater are internally broken due to long-term friction. When not stretched, the light transmission is uniform, and after stretching, spider-web-like bright lines appear, indicating an impending hole. Therefore, stretching and then transmitting light can expose potential fiber damage in clothing, which is more comprehensive and efficient compared to the prior art.

[0036] Based on the embodiment of backlight perspective by stretching the clothing, a limiting groove 9 is provided on the inner wall of the positioning ring 1. Two pin shafts 12 are fixedly installed on the outer wall of the assembly plate 2. The two pin shafts 12 are symmetrically distributed. The pin shafts 12 are slidably and rotatably assembled on the inner wall of the limiting groove 9. A locking member for restricting the sliding of one of the pin shafts 12 is installed on the outer wall of the positioning ring 1. Please refer to Figure 6 and Figure 7 , in this embodiment, after the staff checks the front piece, that is, one side of the clothing, the clothing needs to be flipped to check the back piece. At this time, the assembly plate 2 is directly rotated to flip the front and back pieces to exchange positions, so as to facilitate the staff's inspection. The two pin shafts 12 are symmetrically distributed. When the assembly plate 2 rotates 180 degrees, the two pin shafts 12 will also exchange positions, and the locking member can lock the pin shafts 12 to ensure the flatness and stability of the clothing when laid flat.

[0037] Furthermore, an implementation scheme of the locking member is proposed. The locking member includes a linkage shaft body 15 rotatably installed on the outer wall of the positioning ring 1. The linkage shaft body 15 has an inner cavity. A square locking tongue 14 is slidably installed in the inner cavity. A spring is installed between the square locking tongue 14 and the inner cavity. The square locking tongue 14 can slide along the radial direction of the positioning ring 1. The square locking tongue 14 is snapped into the locking hole 13 under the tension of the spring. A chamfer is designed on the outer wall of the square locking tongue 14. When the pin shaft 12 is forced to slide in the limiting groove 9, the chamfer can be used to force the square locking tongue 14 to retract into the inner cavity, releasing the limitation of the square locking tongue 14 on the pin shaft 12. Please refer to Figure 7In this embodiment, the square lock tongue 14 can slide along the radial direction of the positioning ring 1, that is, the opening direction of the lock hole 13 is also on the radial line of the positioning ring 1. If the pin 12 and the assembly plate 2 can rotate, that is, the rotation axis of the assembly plate 2 is required to be colinear with the radial line of the positioning ring 1, the angle of the clothing can be adjusted, thereby adjusting the angle between the flat surface of the clothing and the perspective of the staff. The best angle for naked eye observation is 30 to 40 degrees, avoiding vertical downward reflection interference. Specifically, when the assembly plate 2 needs to slide on the inner circle of its positioning ring 1, the staff forcibly moves the assembly plate 2 to generate pressure on the square lock tongue 14, and the chamfer design forces the square lock tongue 14 away from the pin 12 and the assembly plate 2, so that the pin 12 and the assembly plate 2 can rotate, thereby adjusting the position of the front and rear pieces. Due to the cooperation between the square lock tongue 14 and the lock hole 13, when the linkage shaft 15 rotates, the square lock tongue 14 can use the lock hole 13 to drive the pin 12 to rotate, so that the assembly plate 2 can rotate to adjust the angle between the flat surface of the clothing and the perspective of the staff.

[0038] Furthermore, part of the outer wall of the linkage shaft 15 is designed with a spiral tooth surface, and a worm wheel 16 is rotatably installed on the outer wall of the positioning ring 1, and the worm wheel 16 is meshingly connected with the spiral tooth surface. In this embodiment, through the cooperation between the linkage shaft 15, the spiral tooth surface and the worm wheel 16, the staff can adjust the rotation angle of the positioning ring 1 and the pin shaft 12 by rotating the worm wheel 16, and a worm is formed between the spiral tooth surface and the linkage shaft 15, and the cooperation between the worm wheel 16 and the worm has a self-locking property, so the staff only needs to rotate the worm wheel 16 until the flat surface of the clothing reaches the best naked eye observation angle.

[0039] Among them, the more preferred embodiment is that the clamp includes a bearing plate 7 installed on the assembly seat 8 and the limiting groove 9, the outer wall of the bearing plate 7 is equipped with an electric telescopic rod, and the output end of the electric telescopic rod is fixedly installed with a clamping plate 5, the clamping plate 5 is located on the side of the expansion shaft 6 away from the transparent cover 3, and the outer wall of the clamping surface of the clamping plate 5 is of arc design. In this embodiment, when the clamping plate 5 approaches the expansion shaft 6, it can clamp and limit the clothing fabric. Due to the size limitation of the clothing, when the clothing fabric is expanded, due to the elastic properties of the fabric, the clothing fabric may shrink together and affect the flat laying, especially when the clothing fabric is stretched again after being expanded, the clothing fabric will shrink together and affect the observation and inspection. Therefore, the clamping plate 5 and the expansion shaft 6 need to be clamped together to prevent the clothing fabric from losing its position.

[0040] On the basis of the clamp embodiment, further, the outer wall of the support shaft 6 is designed with rounded corners, and the outer wall of the support shaft 6 is surrounded by a silicone sleeve with uniform thickness, and the rounded corners of the silicone sleeve are adapted to the arc-shaped outer wall of the splint 5. In this embodiment, in order to improve the anti-slip performance of the support shaft 6 and prevent the clothing fabric from shrinking together under elasticity, the silicone sleeve can improve the limiting ability of the fabric, and the clamping pressure of the splint 5 can further complete the restriction of the clothing fabric and ensure the stretching quality.

[0041] Furthermore, the horizontal central axis of the transparent cover 3 and the support shaft 6 are both in line with the sliding path of the assembly seat 8, and the height of the silicone sleeve in the vertical direction is less than the height of the transparent cover 3 in the vertical direction. Figure 5 In this embodiment, the thickness of the transparent cover 3 is made higher than the thickness of the support shaft 6, and the horizontal center axis of the assembly seat 8 and the support shaft 6 coincide with each other, so that the clothing fabric can fit with the surface of the transparent cover 3 after being laid flat, thereby improving the light transmission effect.

[0042] In combination with the above embodiments, further, two fill lights 17 are detachably installed on the outer wall of the assembly base 8 in a fixed state. The two fill lights 17 are symmetrically distributed along the horizontal center axis of the expansion shaft 6, and the parallel light emitted by the two fill lights 17 is respectively located on the upper and lower surfaces of the expansion shaft 6. By designing the side light distribution, fill light is illuminated from the side of the clothing to highlight the blocked shadows caused by the protrusions on the surface of the clothing fabric. By strengthening the surface texture and three-dimensional details, the shortcomings of traditional vertical light or backlight are compensated, and the invisible microscopic deformation is converted into a visualized light and shadow signal. It is an essential technology for high-end clothing quality inspection and restoration effect evaluation.

[0043] By utilizing the above structures, the backlight perspective method can be used to inspect the regional thinning and damage of the clothing fabric, and the clothing can be stretched for secondary light transmission to expose potential fiber damage of the clothing.

[0044] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense without any doubt. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clothing repair platform, characterized in that: Comprising: A positioning ring (1) and a mounting plate (2) rotatable inside it, two mounting seats (8) assembled on the outer wall of the mounting plate (2), one of the mounting seats (8) being slidably designed on the outer wall of the mounting plate (2), the other mounting seat (8) being fixed to the outer wall of the mounting plate (2), and a spreading shaft body (6) being designed on both of the mounting seats (8); A transparent cover (3) is slidably mounted on the outer wall of the mounting plate (2) between the two mounting seats (8), and an LED flat lamp (4) is installed inside the transparent cover (3); The garment is sleeved on the two spreading shaft bodies (6). At this time, the transparent cover (3) is located inside the garment and provides parallel light to the two spreading planes.

2. The clothing repair platform according to claim 1, characterized in that: A travel groove (11) is formed in the mounting plate (2), a magnetic strip is laid on the inner bottom of the travel groove (11), a magnetic slider is slidably mounted inside the travel groove (11), one of the slidable mounting seats (8) is fixedly mounted on the magnetic slider, and a gripper is mounted on both of the mounting seats (8), and the gripper can exert flexible clamping on the garment on the spreading shaft body (6).

3. The clothing repair platform according to claim 2, characterized in that: A limiting groove (9) is formed in the inner wall of the positioning ring (1), two pin shafts (12) are fixedly mounted on the outer wall of the mounting plate (2), the two pin shafts (12) are symmetrically distributed, the pin shafts (12) are slidably and rotatably assembled on the inner wall of the limiting groove (9), and a locking member for restricting the sliding of one of the pin shafts (12) is mounted on the outer wall of the positioning ring (1).

4. The clothing repair platform according to claim 3, wherein: The locking member includes a linkage shaft body (15) rotatably mounted on the outer wall of the positioning ring (1), the linkage shaft body (15) has an inner cavity, a square locking tongue (14) is slidably mounted inside the inner cavity, a spring is installed between the square locking tongue (14) and the inner cavity, the square locking tongue (14) can slide along the radial direction of the positioning ring (1), the square locking tongue (14) is snapped into a lock hole (13) under the tension of the spring, a chamfer is designed on the outer wall of the square locking tongue (14), and when the pin shaft (12) slides forcibly in the limiting groove (9), the chamfer can be used to force the square locking tongue (14) to retract into the inner cavity, releasing the limitation of the square locking tongue (14) on the pin shaft (12).

5. The clothing repair platform according to claim 4, wherein: A spiral tooth surface is designed on a part of the outer wall of the linkage shaft body (15), and a worm gear (16) is rotatably mounted on the outer wall of the positioning ring (1), and the worm gear (16) is meshed and connected with the spiral tooth surface.

6. The clothing repair platform according to claim 2, characterized in that: The gripper includes a carrier plate (7) mounted on the mounting seat (8) and the limiting groove (9), an electric telescopic rod is assembled on the outer wall of the carrier plate (7), a clamping plate (5) is fixedly mounted at the output end of the electric telescopic rod, the clamping plate (5) is located on the side of the spreading shaft body (6) away from the transparent cover (3), and the outer wall of the clamping surface of the clamping plate (5) is arc-shaped.

7. The clothing repair platform according to claim 6, characterized in that: A fillet is designed on the outer wall of the spreading shaft body (6), a silica gel sleeve with a uniform thickness surrounds the outer wall of the spreading shaft body (6), and the fillet of the silica gel sleeve is adapted to the arc-shaped outer wall of the clamping plate (5).

8. The clothing repair platform according to claim 7, wherein: The horizontal central axes of the transparent cover (3) and the opening shaft (6) are both colinear with the sliding path of the assembly seat (8), and the height of the silicone sleeve in the vertical direction is smaller than the height of the transparent cover (3) in the vertical direction.

9. The clothing repair platform according to any one of claims 1-8, characterized in that: Two fill-in lights (17) are detachably mounted on the outer wall of the assembly seat (8) in a fixed state. The two fill-in lights (17) are symmetrically distributed along the horizontal center axis of the open shaft (6), and the parallel light emitted by the two fill-in lights (17) is respectively located on the upper and lower surfaces of the open shaft (6).