Cloth inspecting machine

The textile inspection machine addresses precision and automation issues by using camera-based positioning and high-temperature ink to mark defects accurately and automate ink replenishment, enhancing operational efficiency and repair ease.

CN223103338UActive Publication Date: 2025-07-15衢州百森服装有限公司
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Patent Information

Application Number
CN202422198944.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-09
Publication Date
2025-07-15
Estimated Expiration
2034-09-09

AI Technical Summary

Technical Problem

Traditional fabric inspection machines have low efficiency in detecting fabric defects and are difficult to accurately locate defect locations, which affects later repairs.

Method used

The camera is positioned, and the telescopic rod is driven by a threaded rod to move accurately, combined with the electric telescopic rod to drive the square shell to lift the mark, use high-temperature disappearing pen ink for marking, and the ink is supplemented through the automatic loading mechanism.

Benefits of technology

It improves the accuracy and mechanical linkage of fabric defect markings, reduces labor intensity, facilitates post-repair, and enhances the convenience and stability of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of textile equipment, in particular to a cloth inspecting machine, which comprises a cloth inspecting mechanism, a cloth inspecting mechanism and a cloth inspecting mechanism, the irradiation lamp is fixed on the top wall of the workbench close to the center of the slope; the winding wheel rotates on one side of the interior of the workbench; the winding unit is fixed to the other side of the interior of the workbench. The camera is fixed to the position, opposite to the irradiation lamp, of the inner bottom wall of the workbench. The workbench comprises a position adjusting mechanism fixed to the position, close to the top, in the workbench; the labeling mechanism is fixed to the position, close to the lower portion of the position adjusting mechanism, in the workbench. And the feeding mechanism slides on the outer wall of the position adjusting mechanism. According to the utility model, when the fabric is detected to have defects, the motor drives the threaded rod to rotate and drives the telescopic rod I to quickly move to a specified position according to the defect position, and the threaded rod is driven to rotate after the camera is used for positioning, so that the telescopic rod I can accurately move to the specified position, and the accuracy of marking the position is effectively improved.
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Description

Technical Field

[0001] The utility model relates to the field of textile equipment, and particularly relates to a cloth inspection machine. Background Art

[0002] In the garment manufacturing industry, the quality of the fabric directly affects the quality of the finished clothing. Traditional cloth inspection machines mainly rely on manual inspection of fabric defects. This process is not only inefficient but also easily affected by factors such as the experience, fatigue, and attention of the inspectors. With the development of technology and the increasing market demand, automated and intelligent cloth inspection machines have become an inevitable trend in the industry.

[0003] Existing cloth inspection machines have some deficiencies during the inspection process. When a defect is detected in the fabric, due to the fast inspection speed, it is difficult for workers to accurately record the specific location of the defect in a short time, which affects the later positioning and repair. Summary of the Utility Model

[0004] In order to overcome the above technical problems, the purpose of the present utility model is to provide a cloth inspection machine. After positioning by the camera, the threaded rod is driven to rotate, so that the first telescopic rod can be accurately moved to the specified position, effectively improving the accuracy of the marked position. Driven by the electric telescopic rod, no matter where the first telescopic rod is located, the corresponding square shell can be lifted to perform non - marking, effectively improving the mechanical linkage and stability. Among them, the ink inside the square shell can use the ink of a high - temperature disappearing pen, and the material contains chromogenic materials, developers, and discoloration temperature adjusters, etc., so that under conditions such as heating, the components can react or volatilize quickly, realizing the disappearance of the handwriting, facilitating the later return to the factory for repair, and effectively improving the convenience.

[0005] A cloth inspection machine, comprising:

[0006] A cloth inspection mechanism, including a workbench;

[0007] An irradiation lamp, fixed at the center position of the top wall of the workbench close to the slope;

[0008] A winding wheel, rotating on one side inside the workbench;

[0009] A winding unit, fixed at the other side inside the workbench;

[0010] A camera, fixed on the inner bottom wall of the workbench at the position opposite to the irradiation lamp;

[0011] The workbench includes:

[0012] A position adjusting mechanism, fixed at a position close to the top inside the workbench;

[0013] A marking mechanism, fixed at a position below the position adjusting mechanism close to the inside of the workbench;

[0014] The feeding mechanism slides on the outer wall of the position adjusting mechanism.

[0015] Furthermore, the position adjusting mechanism includes:

[0016] A motor, fixed on the outer wall of the workbench;

[0017] A first slide rail, fixed at the inner wall of the workbench;

[0018] A threaded rod, rotatably connected to the inner wall of the workbench, and one end of the threaded rod is fixed to the rotating shaft of the motor;

[0019] A slider, screwed on the outer wall of the threaded rod and sliding inside the first slide rail.

[0020] Preferably, the position adjusting mechanism includes:

[0021] A first telescopic rod, fixed on the outer wall of the slider;

[0022] A round rod, fixed on the outer wall of one end of the first telescopic rod;

[0023] The marking mechanism includes:

[0024] A square plate, fixed inside the workbench;

[0025] An electric telescopic rod, fixed at the center on the outer wall of the square plate;

[0026] A C-shaped frame, fixed at one end of the electric telescopic rod;

[0027] Two second slide rails are provided, respectively fixed at both ends of the C-shaped frame, and the outer wall of the second slide rail slides with the outer wall of the round rod.

[0028] Preferably, the marking mechanism includes:

[0029] A first square rod, fixed on the inner wall of the workbench;

[0030] A number of first arc-shaped holes are provided, equidistantly arranged on the outer wall of the first square rod and slidably inserted with the round rod;

[0031] A number of first square holes are provided, equidistantly arranged on the outer wall of the first square rod;

[0032] A number of square shells are provided, all sliding inside the first square holes.

[0033] Preferably, the square shell includes:

[0034] Four L-shaped holes are provided, equidistantly arranged on the outer wall of the square shell;

[0035] An L-shaped sponge pad, sliding inside the L-shaped hole;

[0036] A round hole is opened at the center of the outer wall of the square shell.

[0037] Preferably, the feeding mechanism includes:

[0038] There are two square rods II, which are both slid on the outer walls on both sides of the square rod I;

[0039] A storage box is fixed between the outer walls of the two square rods II;

[0040] There are two telescopic rods II, which are respectively fixed at the bottom walls on both sides of the storage box;

[0041] An arc-shaped hole II is opened on the outer wall of one end of the telescopic rod II and is inserted and matched with the round rod;

[0042] The square rod I includes:

[0043] There are two inclined blocks, which are respectively fixed at positions near one end on the outer walls on both sides of the square rod I.

[0044] Preferably, the feeding mechanism includes:

[0045] A round pipe is fixed at the center of the bottom wall of the storage box;

[0046] A ring shell is fixed on the outer wall of the round pipe;

[0047] There are two square holes II, which are opened on the outer wall of the round pipe at equal angles;

[0048] A ring frame I is fixed at one end inside the round pipe;

[0049] The inner wall of the ring frame II slides on the outer wall of the round pipe;

[0050] A round frame is fixed on the inner wall of the ring frame II and is slidably inserted into the square hole II;

[0051] A spring is fixed between the outer wall of the ring frame II and the inner wall of the ring shell.

[0052] The beneficial effects of the present utility model:

[0053] 1. After positioning by the camera and driving the threaded rod to rotate, the telescopic rod I can be accurately moved to the specified position, effectively improving the accuracy of the marking position.

[0054] 2. Driven by the electric telescopic rod, no matter where the telescopic rod I is located, the corresponding square shell can be jacked up for marking, effectively improving the mechanical linkage and stability. Among them, the ink inside the square shell can adopt the ink of a high-temperature disappearing pen, and the material contains chromogenic materials, developers, and discoloration temperature regulators, etc., so that under heating and other conditions, the components can react or volatilize relatively quickly, realizing the disappearance of the handwriting, facilitating the later return to the factory for repair, and effectively improving the convenience.

[0055] 3. The feeding mechanism can replenish ink inside all the square cases without manual operation by personnel, effectively reducing the labor intensity. An inclined block is provided, which can easily separate the feeding mechanism from the telescopic rod without manual pulling, greatly improving the convenience of mechanical operation. Brief Description of the Drawings

[0056] The following further describes the present utility model in conjunction with the drawings.

[0057] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0058] Figure 2 is a schematic diagram of the partial structure of the fabric inspection mechanism in the present utility model;

[0059] Figure 3 is a schematic diagram of the position adjustment mechanism and the marking mechanism in the present utility model;

[0060] Figure 4 is a schematic diagram of the partial structure of the first slide rail in the present utility model;

[0061] Figure 5 is a schematic diagram of the C-shaped frame structure in the present utility model;

[0062] Figure 6 is a schematic diagram of the partial structure of the marking mechanism in the present utility model;

[0063] Figure 7 is a schematic diagram of the inclined block structure in the present utility model;

[0064] Figure 8 is a schematic diagram of the feeding mechanism structure in the present utility model;

[0065] Figure 9 is a schematic diagram of the round tube structure in the present utility model.

[0066] In the figure: 100, fabric inspection mechanism; 110, workbench; 111, irradiation lamp; 120, winding wheel; 130, winding unit; 140, camera; 200, position adjustment mechanism; 210, motor; 211, first slide rail; 212, threaded rod; 213, slider; 214, first telescopic rod; 215, round rod; 300, marking mechanism; 310, square plate; 311, electric telescopic rod; 312, C-shaped frame; 320, second slide rail; 330, first square rod; 331, first arc-shaped hole; 333, first square hole; 334, inclined block; 340, square case; 341, L-shaped hole; 342, L-shaped sponge pad; 343, round hole; 400, feeding mechanism; 410, second square rod; 420, storage box; 430, second telescopic rod; 431, second arc-shaped hole; 440, round tube; 441, ring shell; 442, second square hole; 443, first ring frame; 444, second ring frame; 445, round frame; 446, spring. Specific embodiments

[0067] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0068] Please refer to Figures 1-9 As shown, a cloth inspection machine includes: The cloth inspection mechanism 100 includes a workbench 110; an irradiation lamp 111 is fixed at a position near the center of the slope on the top wall of the workbench 110; a winding wheel 120 rotates at one side inside the workbench 110; a winding unit 130 is fixed at the other side inside the workbench 110; a camera 140 is fixed on the inner bottom wall of the workbench 110 at a position opposite to the irradiation lamp 111; the workbench 110 includes: a position adjustment mechanism 200 is fixed at a position near the top inside the workbench 110; a marking mechanism 300 is fixed at a position below the position adjustment mechanism 200 inside the workbench 110; a feeding mechanism 400 slides on the outer wall of the position adjustment mechanism 200; the position adjustment mechanism 200 includes: a motor 210, which is fixed on the outer wall of the workbench 110; a first slide rail 211 is fixed on the inner wall of the workbench 110; a threaded rod 212 is rotatably connected to the inner wall of the workbench 110 and one end of the threaded rod 212 is fixed to the rotating shaft of the motor 210; a slider 213 is screwed on the outer wall of the threaded rod 212 and slides inside the first slide rail 211.

[0069] The position adjusting mechanism 200 includes: a first telescopic rod 214 fixed to the outer wall of the slider 213; a round rod 215 fixed to the outer wall of one end of the first telescopic rod 214; the marking mechanism 300 includes: a square plate 310 fixed inside the workbench 110; an electric telescopic rod 311 fixed at the center of the outer wall of the square plate 310; a C-shaped frame 312 fixed at one end of the electric telescopic rod 311; two second slide rails 320 are respectively fixed at both ends of the C-shaped frame 312 and the outer wall of the second slide rail 320 slides with the outer wall of the round rod 215; the marking mechanism 300 includes: a first square rod 330 fixed to the inner wall of the workbench 110; a number of first arc-shaped holes 331 are equidistantly formed on the outer wall of the first square rod 330 and are slidably inserted with the round rod 215; a number of first square holes 333 are equidistantly formed on the outer wall of the first square rod 330; a number of square shells 340 are all slidably arranged inside the first square holes 333; the square shell 340 includes: four L-shaped holes 341 are equidistantly formed on the outer wall of the square shell 340; an L-shaped sponge pad 342 slides inside the L-shaped hole 341; a circular hole 343 is formed at the center of the outer wall of the square shell 340; the feeding mechanism 400 includes: two second square rods 410 are both slidably arranged on the outer walls on both sides of the first square rod 330; a storage box 420 is fixed between the outer walls of the two second square rods 410; two second telescopic rods 430 are respectively fixed at the bottom walls on both sides of the storage box 420; a second arc-shaped hole 431 is formed on the outer wall of one end of the second telescopic rod 430 and is inserted and matched with the round rod 215; the first square rod 330 includes: two inclined blocks 334 are respectively fixed at positions near one end on the outer walls on both sides of the first square rod 330.

[0070] The feeding mechanism 400 includes: a round tube 440 fixed at the center of the bottom wall of the storage box 420; an annular shell 441 fixed to the outer wall of the round tube 440; two second square holes 442 are formed on the outer wall of the round tube 440 at equal angles; a first annular frame 443 is fixed at one end inside the round tube 440; the inner wall of a second annular frame 444 slides on the outer wall of the round tube 440; a circular frame 445 is fixed to the inner wall of the second annular frame 444 and is slidably inserted with the second square hole 442; a spring 446 is fixed between the outer wall of the second annular frame 444 and the inner wall of the annular shell 441.

[0071] Specifically, during operation, the rewinding unit 130 drives the fabric wound around the rewinding winding wheel 120 to be detected by the camera 140 disposed inside the workbench 110. When vertical light shines from above, stains will form shadows above the cloth. The camera 140 observes from below the cloth, and the influence of the shadow is small, making the contrast between the stains and the surrounding clean area relatively higher, thus making it easier to distinguish. When a defect is detected in the fabric, according to the defect position, the motor 210 drives the threaded rod 212 to rotate, driving the first telescopic rod 214 to quickly move to the specified position. The electric telescopic rod 311 drives the C-shaped frame 312 to move upward, driving one end of the first telescopic rod 214 fixed to the round rod 215 sliding along the corresponding arc-shaped hole 331 of the second slide rail 320, lifting the square shell 340, and pasting the side with the L-shaped hole 341 against the defect for marking. When the ink is lacking inside the square shell 340, the operator pushes the feeding mechanism 400 to slide along the track 332 until the arc-shaped hole 431 is engaged with the round rod 215. After the motor 210 drives the first telescopic rod 214 to move to the specified position, the electric telescopic rod 311 drives to lift the corresponding square shell 340, causing the outer wall to squeeze the second ring frame 444. The second ring frame 444 slides into the ring shell 441 under the extrusion, and the round frame 445 is separated from the first ring frame 443. The ink flows into the square shell 340 from the gap along the round hole 343. When not in use, the feeding mechanism 400 is pushed back to the original position. On the way, it passes through the inclined block 334, causing one end of the second square rod 410 to be squeezed and contracted, releasing the limit with the round rod 215.

[0072] Embodiment 1

[0073] As Figures 3-4 shown, in this embodiment, the position adjustment mechanism 200 includes: a motor 210 fixed to the outer wall of the workbench 110; a first slide rail 211 fixed to the inner wall of the workbench 110; a threaded rod 212 rotatably connected to the inner wall of the workbench 110, and one end of the threaded rod 212 is fixed to the rotating shaft of the motor 210; a slider 213 screwed onto the outer wall of the threaded rod 212 and sliding inside the first slide rail 211; the position adjustment mechanism 200 includes: a first telescopic rod 214 fixed to the outer wall of the slider 213; a round rod 215 fixed to the outer wall of one end of the first telescopic rod 214.

[0074] In this embodiment, when a defect is detected in the fabric, according to the defect position, the motor 210 drives the threaded rod 212 to rotate, driving the first telescopic rod 214 to quickly move to the specified position. After positioning by the camera 140, driving the threaded rod 212 to rotate can make the first telescopic rod 214 accurately move to the specified position, effectively improving the accuracy of the marking position.

[0075] As Figures 4-6As shown, in this embodiment, the marking mechanism 300 includes: a square plate 310 fixed inside the workbench 110; an electric telescopic rod 311 fixed at the center of the outer wall of the square plate 310; a C-shaped frame 312 fixed at one end of the electric telescopic rod 311; two second slide rails 320 respectively fixed at both ends of the C-shaped frame 312, and the outer wall of the second slide rail 320 slides on the outer wall of the round rod 215; the marking mechanism 300 further includes: a first square rod 330 fixed on the inner wall of the workbench 110; a plurality of first arc-shaped holes 331 equally spaced and opened on the outer wall of the first square rod 330 and slidably inserted with the round rod 215; a plurality of first square holes 333 equally spaced and opened on the outer wall of the first square rod 330; a plurality of square shells 340 all slidable inside the first square holes 333; the square shell 340 includes: four L-shaped holes 341 equally spaced and opened on the outer wall of the square shell 340; an L-shaped sponge pad 342 slidable inside the L-shaped hole 341; a round hole 343 opened at the center of the outer wall of the square shell 340.

[0076] During specific implementation, the electric telescopic rod 311 drives the C-shaped frame 312 to move upward, driving one end of the first telescopic rod 214 fixed to the round rod 215 sliding along the corresponding trajectory of the first arc-shaped hole 331, jacking up the square shell 340, and pasting the side with the L-shaped hole 341 against the defect for marking. Driven by the electric telescopic rod 311, no matter where the first telescopic rod 214 is located, its corresponding square shell 340 can be jacked up for marking, effectively improving the mechanical linkage and stability. Among them, the ink inside the square shell 340 can adopt the ink of a high-temperature disappearing pen, and the material contains chromogenic materials, color developers, color change temperature regulators, etc., so that under conditions such as heating, the components can react or volatilize relatively quickly, realizing the disappearance of the handwriting, facilitating the later return to the factory for repair, and effectively improving the convenience.

[0077] Embodiment Two

[0078] As Figures 7-9As shown, in this embodiment, the feeding mechanism 400 includes: two square rods II 410, which are both slidably arranged on the outer walls on both sides of the square rod I 330; a storage box 420, which is fixed between the outer walls of the two square rods II 410; two telescopic rods II 430, which are respectively fixed at the bottom walls on both sides of the storage box 420; an arc-shaped hole II 431, which is opened on the outer wall of one end of the telescopic rod II 430 and is inserted and matched with the round rod 215; the square rod I 330 includes: two inclined blocks 334, which are respectively fixed at positions near one end on the outer walls on both sides of the square rod I 330; the feeding mechanism 400 includes: a round tube 440, which is fixed at the center of the bottom wall of the storage box 420; an annular shell 441, which is fixed on the outer wall of the round tube 440; two square holes II 442, which are equiangularly opened on the outer wall of the round tube 440; an annular frame I 443, which is fixed at one end inside the round tube 440; an annular frame II 444, whose inner wall slides on the outer wall of the round tube 440; a round frame 445, which is fixed on the inner wall of the annular frame II 444 and is slidably inserted into the square hole II 442; a spring 446, which is fixed between the outer wall of the annular frame II 444 and the inner wall of the annular shell 441.

[0079] During specific implementation, when the ink in the square shell 340 is insufficient, the operator pushes the feeding mechanism 400 to slide along the trajectory of 332 until the arc-shaped hole II 431 is clamped with the round rod 215. After the motor 210 drives the telescopic rod I 214 to move to the designated position, the electric telescopic rod 311 drives to jack up the corresponding square shell 340, so that the outer wall presses on the annular frame II 444. The annular frame II 444 slides into the annular shell 441 under the extrusion, and the round frame 445 is separated from the annular frame I 443. The ink flows into the square shell 340 from the gap along the round hole 343. When not in use, the feeding mechanism 400 is pushed back to the original position. On the way, it passes through the inclined block 334, so that one end of the square rod II 410 is squeezed and contracted, and the limit with the round rod 215 is released. The feeding mechanism 400 can supplement the ink in all the square shells 340 without manual operation by the operator, effectively reducing the labor intensity. And with the inclined block 334 provided, the feeding mechanism 400 can be easily separated from the telescopic rod I 214 without manual pulling, greatly improving the convenience of mechanical operation.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0081] The above content is only an example and illustration of the present utility model. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described. As long as they do not deviate from the utility model or exceed the scope defined by this claim book, they shall fall within the protection scope of the present utility model.

Claims

1. A cloth inspection machine, comprising: A cloth inspection mechanism (100), including a workbench (110); An irradiation lamp (111), fixed at a position near the center of the slope on the top wall of the workbench (110); A winding wheel (120), rotating on one side inside the workbench (110); A winding unit (130), fixed on the other side inside the workbench (110); A camera (140), fixed on the inner bottom wall of the workbench (110) at the position opposite to the irradiation lamp (111); Characterized in that the workbench (110) includes: A position adjustment mechanism (200), fixed at a position near the top inside the workbench (110); A marking mechanism (300), fixed at a position inside the workbench (110) near the lower position of the position adjustment mechanism (200); A feeding mechanism (400), sliding on the outer wall of the position adjustment mechanism (200).

2. The fabric inspection machine according to claim 1, wherein The position adjustment mechanism (200) includes: A motor (210), fixed on the outer wall of the workbench (110); A first slide rail (211), fixed on the inner wall of the workbench (110); A threaded rod (212), rotatably connected to the inner wall of the workbench (110), and one end of the threaded rod (212) is fixed to the rotating shaft of the motor (210); A slider (213), screwed on the outer wall of the threaded rod (212), and sliding inside the first slide rail (211).

3. A cloth inspection machine according to claim 2, characterized in that, The position adjustment mechanism (200) includes: A first telescopic rod (214), fixed on the outer wall of the slider (213); A round rod (215), fixed on the outer wall of one end of the first telescopic rod (214); The marking mechanism (300) includes: A square plate (310), fixed inside the workbench (110); An electric telescopic rod (311), fixed at the center on the outer wall of the square plate (310); A C-shaped frame (312), fixed at one end of the electric telescopic rod (311); Two second slide rails (320), respectively fixed at both ends of the C-shaped frame (312), and the outer wall of the second slide rail (320) slides on the outer wall of the round rod (215).

4. The fabric inspection machine according to claim 3, characterized in that, The marking mechanism (300) includes: A first square rod (330), fixed on the inner wall of the workbench (110); A number of arc-shaped holes (331), equally spaced and opened on the outer wall of the first square rod (330), and slidably inserted with the round rod (215); A number of square holes (333), equally spaced and opened on the outer wall of the first square rod (330); A number of square shells (340), all sliding inside the square holes (333).

5. A cloth inspection machine according to claim 4, characterized in that, The square shell (340) includes: Four L-shaped holes (341), equally spaced and opened on the outer wall of the square shell (340); An L-shaped sponge pad (342), sliding inside the L-shaped hole (341); A round hole (343), opened at the center on the outer wall of the square shell (340).

6. An inspection machine according to claim 5, characterized in that, The feeding mechanism (400) includes: Two second square rods (410), both sliding on the outer walls on both sides of the first square rod (330); A storage box (420), fixed between the outer walls of the two second square rods (410); Two second telescopic rods (430), respectively fixed at the bottom walls on both sides of the storage box (420); Arc-shaped hole two (431) is opened at the outer wall of one end of the telescopic rod two (430) and is in plug-in fit with the round rod (215); The square rod one (330) includes: Two inclined blocks (334) are respectively fixed at positions close to one end on the outer walls on both sides of the square rod one (330).

7. The fabric inspection machine according to claim 6, characterized in that, The feeding mechanism (400) includes: The round tube (440) is fixed at the center of the bottom wall of the storage box (420); The ring shell (441) is fixed on the outer wall of the round tube (440); Two square holes two (442) are opened on the outer wall of the round tube (440) at equal angles; The first ring frame (443) is fixed at one end inside the round tube (440); The inner wall of the second ring frame (444) slides on the outer wall of the round tube (440); The round frame (445) is fixed on the inner wall of the second ring frame (444) and is in sliding plug-in connection with the square hole two (442); The spring (446) is fixed between the outer wall of the second ring frame (444) and the inner wall of the ring shell (441).