Liquid crystal display surface defect detection device

Abstract

The invention provides a liquid crystal display screen surface defect detection device, and relates to the field of liquid crystal display screen surface defect detection. The device comprises a shell, a base is fixedly connected to the lower surface of the inner side of the shell, a chain wheel conveying belt is fixedly connected to the upper surface of the base, an inspection device is arranged on the surface of the inner side of the base, a display screen is installed on the upper surface of the inspection device, and a fixing support is fixedly connected to the upper surface of the base. The display screen is moved to the position of the shooting device through the arranged inspection device and limited through the moving device, the display screen does not need to be taken down for detection for many times, the possibility that the display screen is damaged is reduced, and the display screen is shot in multiple directions through cooperation of the rotating device, the moving device, the shooting device and the inspection device. More observation angles are provided, the torsion spring can return to the original position after detection is completed, and the situation that the detection efficiency is affected due to the fact that the position on the chain wheel conveying belt cannot be aligned is reduced.

Description

Technical Field

[0001] The present invention relates to the field of surface defect detection of liquid crystal display screens, and in particular to a surface defect detection device for liquid crystal display screens. Background Art

[0002] Liquid crystal display (LCD) is a widely used display technology, mainly used for screens of televisions, computer monitors, mobile phones, and other electronic devices. Its working principle is based on the optical properties of liquid crystal materials, which can change the propagation direction of light under the action of an electric field, thereby adjusting the displayed image. Some LCDs use 2D materials (such as graphene, transition metal disulfides, etc.). The application of these new materials in LCD screens is mainly reflected in improving performance, enhancing electrical conductivity, improving touch sensitivity, and increasing the overall quality of the display. When inspecting it, a high-resolution optical microscope is used to observe the surface of the LCD screen, so as to directly detect the thin layer structure of the 2D material and its distribution on the display. By using light of different wavelengths, it is possible to check the surface quality of the material and whether there are particles, cracks or other defects.

[0003] The existing display screen inspection method is to transport the display screen to the inspection position for inspection and then transport it away. For example, "the invention patent application with publication number CN119334955A discloses a liquid crystal display surface defect inspection device" by transporting the display screen to the position of the processing table assembly and fixing the display screen and then inspecting it. This inspection method requires the display screen to be clamped multiple times, which can easily damage the display screen during the clamping process. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a device for detecting surface defects of a liquid crystal display screen, which solves the problem that the display screen is easily damaged by multiple clamping.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A surface defect detection device for a liquid crystal display screen, comprising a shell, the inner lower surface of the shell is fixedly connected to a base, the upper surface of the base is fixedly connected to a sprocket conveyor belt, the inner surface of the base is provided with an inspection device, the upper surface of the inspection device is installed with a display screen, the upper surface of the base is fixedly connected to a fixed bracket, the upper surface of the fixed bracket is provided with a rotating device, a moving device is provided between the fixed brackets, and the upper surface of the rotating device is provided with a shooting device.

[0008] Preferably, the inspection device includes an electric screw, a turntable assembly, a tilting assembly, a movable connecting block, a clamping assembly and a receiving assembly. The electric screw is fixedly connected to the inner surface of the base, the turntable assembly is rotatably connected to the output end of the electric screw, the tilting assembly is fixedly connected to the upper surface of the turntable assembly, the movable connecting block is movably connected to the inner surface of the tilting assembly, the clamping assembly is arranged on the upper surface of the movable connecting block, the upper surface of the chain of the sprocket conveyor is provided with a limit block for limiting the receiving assembly, the receiving assembly is installed on the upper surface of the sprocket conveyor through the limit block, and the display screen is installed on the upper surface of the receiving assembly.

[0009] The transmission gear of the present invention is connected with the transmission gear of the present invention on the one hand, and the transmission gear of the present invention is connected with the transmission gear of the present invention on the other hand, and the transmission gear of the present invention is connected with the transmission gear of the present invention on the other hand.

[0010] Preferably, the turntable assembly includes a rotating disk, a torsion spring and a fixed rod, the lower end of the fixed rod is fixedly connected to the output end of the electric screw, the rotating disk is rotatably connected to the upper surface of the fixed rod, the upper end of the torsion spring is fixedly connected to the lower surface of the rotating disk, and the lower end of the torsion spring is fixedly connected to the side surface of the fixed rod.

[0011] Preferably, the tilting assembly includes a fixed connecting block, a third gear, a worm wheel, a worm and a sixth gear, the sixth gear is fixedly connected to the inner surface of the rotating disk, the worm is fixedly connected to the output end of the sixth gear, the worm wheel is meshed with the worm, the third gear is fixedly connected to the worm wheel and rotatably connected to the inner surface of the rotating disk, the lower end of the movable connecting block is provided with an arc-shaped tooth plate, the third gear is meshed with the arc-shaped tooth plate, the fixed connecting block is fixedly connected to the upper surface of the rotating disk, and the lower end of the movable connecting block is movably connected to the inner surface of the fixed connecting block.

[0012] Preferably, the receiving assembly includes a receiving block, a fixing plate, a limiting bracket, a second screw rod and a gasket, the fixing plate is fixedly connected to the front and rear ends of the receiving block, the receiving block is installed on the limiting tooth plate on the sprocket conveyor belt through the fixing plate, the lower end of the limiting bracket is fixedly connected to the upper surface of the receiving block at the edge, the second screw rod is threadedly connected to the inner surface of the upper end of the limiting bracket, and the gasket is fixedly connected to the lower end of the second screw rod.

[0013] Preferably, the rotating device includes an inner gear ring, a first gear and a first motor, the inner gear ring is rotatably connected to the inner surface of the fixed bracket, the first motor is fixedly connected to the inner surface of the fixed bracket, the lower end of the first gear is fixedly connected to the output end of the first motor, and the inner ring surface of the inner gear ring is meshed with the first gear.

[0014] Preferably, the moving device includes an arc-shaped moving gear plate, a limit plug, a second gear, a second motor, a first screw rod, a third motor and a moving block, the third motor is fixedly connected to the inner surface of the fixed bracket, one end of the first screw rod is fixedly connected to the output end of the third motor, the other end of the first screw rod is rotatably connected to the inner surface of the fixed bracket, the moving block is threadedly connected to the side surface of the first screw rod, the second motor is fixedly connected to the inner surface of the moving block, the lower end of the second gear is fixedly connected to the output end of the second motor, the second gear is meshed with the outer ring of the arc-shaped moving gear plate, the arc-shaped moving gear plate is movably connected to the inner surface of the moving block, and the second gear is provided with multiple and distributed connections on the inner ring surface of the arc-shaped moving gear plate.

[0015] Preferably, the shooting device includes an arc-shaped moving rod, a first limit block, a second limit block, an electric roller, a lighting plate, a limit pin, a support frame and a microscope camera. The arc-shaped moving rod is provided with multiple paths and fixedly connected to the upper surface of the inner gear ring. The limit pins are respectively fixedly connected to the side surfaces of the support frame and the microscope camera. The electric roller is rotatably connected to the inner surfaces of the first limit block and the second limit block. The first limit block is fixedly connected to the right side surface of the support frame, and the second limit block is fixedly connected to the right side surface of the microscope camera. The support frame and the microscope camera are movably connected to the inner surface of the arc-shaped moving rod through the limit pin and the electric roller respectively, and the lighting plate is fixedly connected to the left side surface of the support frame.

[0016] (3) Beneficial effects

[0017] The present invention provides a device for detecting surface defects of a liquid crystal display screen. It has the following beneficial effects:

[0018] 1. The display screen is moved to the position of the shooting device through the set inspection device and limited by the moving device, so that the display screen does not need to be removed for inspection multiple times, reducing the possibility of damage to the display screen.

[0019] 2. The display screen can be photographed from multiple angles through the cooperation of the rotating device, moving device, shooting device and inspection device, providing more observation angles.

[0020] 3. The torsion spring can return to its original position after the test is completed, reducing the impact on the test efficiency caused by the inability to align the position of the sprocket conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a liquid crystal display surface defect detection device proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the first internal structure of a liquid crystal display surface defect detection device proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the second internal structure of a liquid crystal display surface defect detection device proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the first structure of the inspection device of the liquid crystal display surface defect detection device proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the second structure of the inspection device of the liquid crystal display surface defect detection device proposed by the present invention;

[0026] Figure 6 This is a schematic structural diagram of a clamping component of a liquid crystal display surface defect detection device proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of a tilting component of a liquid crystal display surface defect detection device proposed by the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of a receiving component of a liquid crystal display surface defect detection device proposed by the present invention;

[0029] Figure 9 For the present invention Figure 8 Enlarged view of part A in the middle;

[0030] Figure 10 This is a schematic diagram of the first structure of a rotating device of a liquid crystal display surface defect detection device proposed by the present invention;

[0031] Figure 11 This is a schematic structural diagram of a mobile device of a liquid crystal display surface defect detection device proposed by the present invention;

[0032] Figure 12 This is a schematic diagram of the first structure of a photographing device of a liquid crystal display surface defect detection device proposed by the present invention;

[0033] Figure 13 This is a second structural schematic diagram of a photographing device of a liquid crystal display surface defect detection device proposed by the present invention;

[0034] Figure 14 This is a third structural schematic diagram of a photographing device of a liquid crystal display surface defect detection device proposed by the present invention;

[0035] Figure 15 This is a fourth structural schematic diagram of a photographing device of a liquid crystal display surface defect detection device proposed by the present invention.

[0036] Among them, 1. Shell; 2. Base; 3. Sprocket conveyor; 4. Display screen; 5. Fixed bracket; 6. Rotating device; 601. Internal gear ring; 602. First gear; 603. First motor; 7. Camera; 701. Arc moving rod; 702. First limit block; 703. Second limit block; 704. Electric roller; 705. Lighting plate; 706. Limit pin; 707. Support frame; 708. Micro camera; 8. Moving device; 801. Arc moving gear plate; 802. Limit plug; 803. Second gear; 804. Second motor; 805. First screw rod; 806. Third motor; 807. Moving block; 9. Inspection device; 901. Electric screw rod; 902. Turntable assembly; 902 01. Rotating disk; 90202. Torsion spring; 90203. Fixed rod; 903. Tilting assembly; 90301. Fixed connecting block; 90302. Third gear; 90303. Worm gear; 90304. Worm; 90305. Sixth gear; 904. Movable connecting block; 905. Clamping assembly; 90501. Sliding rod; 90502. Spring; 90503. Clamping block; 90504. Bidirectional cam; 90505. Camshaft; 90506. Fourth gear; 90507. Fifth gear; 90508. Fourth motor; 906. Supporting assembly; 90601. Supporting block; 90602. Fixed plate; 90603. Limiting bracket; 90604. Second screw rod; 90605. Gasket. DETAILED DESCRIPTION

[0037] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] Example 1:

[0039] like Figure 1-15 As shown, an embodiment of the present invention provides a surface defect detection device for a liquid crystal display screen, comprising a shell 1, a base 2 is fixedly connected to the inner lower surface of the shell 1, a sprocket conveyor belt 3 is fixedly connected to the upper surface of the base 2, an inspection device 9 is provided on the inner surface of the base 2, a display screen 4 is installed on the upper surface of the inspection device 9, a fixed bracket 5 is fixedly connected to the upper surface of the base 2, a rotating device 6 is provided on the upper surface of the fixed bracket 5, a moving device 8 is provided between the fixed brackets 5, and a shooting device 7 is provided on the upper surface of the rotating device 6.

[0040] The sprocket conveyor 3 is an existing device, which is driven by a sprocket, and the display screen 4 is a display screen made of new materials added inside.

[0041] The inspection device 9 includes an electric screw 901, a turntable assembly 902, a tilting assembly 903, a movable connecting block 904, a clamping assembly 905 and a receiving assembly 906. The electric screw 901 is fixedly connected to the inner surface of the base 2, the turntable assembly 902 is rotatably connected to the output end of the electric screw 901, the tilting assembly 903 is fixedly connected to the upper surface of the turntable assembly 902, the movable connecting block 904 is movably connected to the inner surface of the tilting assembly 903, the clamping assembly 905 is arranged on the upper surface of the movable connecting block 904, and the upper surface of the chain of the sprocket conveyor 3 is provided with a limiting block for limiting the receiving assembly 906. The receiving assembly 906 is installed on the upper surface of the sprocket conveyor 3 through the limiting block, and the display screen 4 is installed on the upper surface of the receiving assembly 906.

[0042] The electric screw 901 is an existing device that is extended and retracted through an internal screw and has a limit function.

[0043] The clamping assembly 905 includes a slide bar 90501, a spring 90502, a clamping block 90503, a bidirectional cam 90504, a camshaft 90505, a fourth gear 90506, a fifth gear 90507 and a fourth motor 90508. One end of the slide bar 90501 is slidably connected to the inner surface of the movable connection block 904, and the other end of the slide bar 90501 is fixedly connected to the side surface of the clamping block 90503. The spring 90502 is sleeved on the side surface of the slide bar 90501, one end of the spring 90502 is fixedly connected to the side surface of the clamping block 90503, and the other end of the spring 90502 is fixedly connected to the inner surface of the movable connection block 904. The clamping block 90503 slides. It is connected to the inner surface of the movable connecting block 904, the fourth motor 90508 is fixedly connected to the inner surface of the movable connecting block 904, the fifth gear 90507 is fixedly connected to the output end of the fourth motor 90508, the camshaft 90505 is rotatably connected to the inner surface of the movable connecting block 904, the fourth gear 90506 is fixedly connected to the side surface of the camshaft 90505 located in the middle position, the fifth gear 90507 is meshed with the fourth gear 90506, and two bidirectional cams 90504 are provided and are fixedly connected to the two ends of the camshaft 90505 respectively, and the side of the bidirectional cam 90504 is in contact with the outer end of the clamping block 90503 extending on the side of the movable connecting block 904.

[0044] The inspection device 9 has the functions of clamping, extending, and tilting, and can perform multi-directional inspection on the display screen 4.

[0045] The turntable assembly 902 includes a rotating disk 90201, a torsion spring 90202 and a fixed rod 90203. The lower end of the fixed rod 90203 is fixedly connected to the output end of the electric screw 901. The rotating disk 90201 is rotatably connected to the upper surface of the fixed rod 90203. The upper end of the torsion spring 90202 is fixedly connected to the lower surface of the rotating disk 90201. The lower end of the torsion spring 90202 is fixedly connected to the side surface of the fixed rod 90203.

[0046] The slots on both sides of the rotating disk 90201 are large enough to allow the limit plug 802 to be inserted, and the torsion spring 90202 can return the rotating disk 90201 to the normal position after the rotating disk 90201 is released from the limit.

[0047] The tilting assembly 903 includes a fixed connecting block 90301, a third gear 90302, a worm wheel 90303, a worm 90304 and a sixth gear 90305. The sixth gear 90305 is fixedly connected to the inner surface of the rotating disk 90201. The worm 90304 is fixedly connected to the output end of the sixth gear 90305. The worm wheel 90303 is meshed with the worm 90304. The third gear 90302 is fixedly connected to the worm wheel 90303 and is rotatably connected to the inner surface of the rotating disk 90201. The lower end of the movable connecting block 904 is provided with an arc-shaped tooth plate. The third gear 90302 is meshed with the arc-shaped tooth plate. The fixed connecting block 90301 is fixedly connected to the upper surface of the rotating disk 90201. The lower end of the movable connecting block 904 is movably connected to the inner surface of the fixed connecting block 90301.

[0048] The receiving assembly 906 includes a receiving block 90601, a fixed plate 90602, a limiting bracket 90603, a second screw rod 90604 and a gasket 90605. The fixed plate 90602 is fixedly connected to the front and rear ends of the receiving block 90601. The receiving block 90601 is installed on the limiting tooth plate on the sprocket conveyor belt 3 through the fixed plate 90602. The lower end of the limiting bracket 90603 is fixedly connected to the upper surface of the receiving block 90601 at the edge. The second screw rod 90604 is threadedly connected to the inner surface of the upper end of the limiting bracket 90603. The gasket 90605 is fixedly connected to the lower end of the second screw rod 90604.

[0049] The receiving block 90601 is internally provided with a slot corresponding to the clamping block 90503 for limiting the receiving block 90601 .

[0050] The rotating device 6 includes an inner gear ring 601, a first gear 602 and a first motor 603. The inner gear ring 601 is rotatably connected to the inner surface of the fixed bracket 5, the first motor 603 is fixedly connected to the inner surface of the fixed bracket 5, the lower end of the first gear 602 is fixedly connected to the output end of the first motor 603, and the inner ring surface of the inner gear ring 601 is meshed with the first gear 602.

[0051] The moving device 8 includes an arc-shaped moving gear plate 801, a limit plug 802, a second gear 803, a second motor 804, a first screw rod 805, a third motor 806 and a moving block 807. The third motor 806 is fixedly connected to the inner surface of the fixed bracket 5, one end of the first screw rod 805 is fixedly connected to the output end of the third motor 806, and the other end of the first screw rod 805 is rotatably connected to the inner surface of the fixed bracket 5. The moving block 807 is threadedly connected to the side surface of the first screw rod 805, the second motor 804 is fixedly connected to the inner surface of the moving block 807, the lower end of the second gear 803 is fixedly connected to the output end of the second motor 804, the second gear 803 is meshed with the outer ring of the arc-shaped moving gear plate 801, the arc-shaped moving gear plate 801 is movably connected to the inner surface of the moving block 807, and the second gear 803 is provided with multiple and distributed connections on the inner ring surface of the arc-shaped moving gear plate 801.

[0052] Arc grooves are provided on the upper and lower surfaces of the arc-shaped movable tooth plate 801 for limiting the position in the movable block 807 .

[0053] The shooting device 7 includes an arc-shaped moving rod 701, a first limit block 702, a second limit block 703, an electric roller 704, a lighting plate 705, a limit pin 706, a support frame 707 and a microscope camera 708. The arc-shaped moving rod 701 is provided with multiple paths and is fixedly connected to the upper surface of the inner gear ring 601. The limit pin 706 is respectively fixedly connected to the side surfaces of the support frame 707 and the microscope camera 708. The electric roller 704 is rotatably connected to the inner surfaces of the first limit block 702 and the second limit block 703. The first limit block 702 is fixedly connected to the right side surface of the support frame 707. The second limit block 703 is fixedly connected to the right side surface of the microscope camera 708. The support frame 707 and the microscope camera 708 are movably connected to the inner surface of the arc-shaped moving rod 701 through the limit pin 706 and the electric roller 704 respectively. The lighting plate 705 is fixedly connected to the left side surface of the support frame 707.

[0054] The lighting board 705 is an existing lighting device that can emit light of different wavelengths. The microscope camera 708 is an existing device with a microscope function and can perform microscopic photography.

[0055] Working principle: the display screen 4 is mounted on the receiving block 90601, and then the second screw rod 90604 is rotated to move the gasket 90605 downward to fix the edge of the display screen 4, and then the receiving block 90601 is mounted on the sprocket conveyor 3 through the fixing plate 90602 and the limit block and the sprocket conveyor 3 is started to move, and then the sprocket conveyor 3 is moved to the position of the inspection device 9, and then the electric screw rod 901 is started to drive the turntable assembly 902 to move upward, and the clamping assembly 905 is driven to move upward through the tilting assembly 903 and the movable connecting block 904, and then when the clamping assembly 905 moves upward to the corresponding position inside the receiving assembly 906, the fourth motor 90508 is started to drive the fifth gear 9 0507 rotates, thereby driving the fourth gear 90506 to rotate. The fourth gear 90506 rotates through the cam shaft 90505, driving the two-way cam 90504 to rotate half a circle, thereby driving the clamping block 90503 to move to both sides. After that, when the inspection device 9 moves to the position used to limit in the receiving component 906, the two-way cam 90504 rotates half a circle again. At this time, the clamping block 90503 moves back to its original position through the elastic force of the spring 90502, thereby clamping the corresponding position inside the receiving component 906 for fixing. Then the clamping component 905 continues to move upward, moving the bottom of the turntable component 902 to the position above the limit plug 802, and then starting the third motor 806 to drive the first screw rod 805 to rotate. The first screw rod 80 The rotation drives the moving block 807 to move toward the center, inserting the limit plug 802 into the corresponding hole in the rotating disk 90201. Then, the sixth gear 90305 is started to drive the worm 90304 to rotate. The rotation of the worm 90304 drives the worm wheel 90303 to rotate, thereby driving the third gear 90302 to rotate. The rotation of the third gear 90302 drives the movable connecting block 904 to tilt through the arc-shaped tooth plate provided at the lower end of the movable connecting block 904. Then, the lighting plate 705 is synchronously started to emit light of different wavelengths to the surface of the display screen 4 and the micro camera 708 is started to shoot the surface of the display screen 4. At the same time, the electric rollers 704 thereon are respectively started to detect the surface of the display screen 4 from multiple angles. At the same time, when the display screen needs to be rotated, When the screen 4 is being inspected, the second motor 804 is started to drive the second gear 803 to rotate. The rotation of the second gear 803 drives the arc-shaped movable tooth plate 801 to move, thereby driving the rotating disk 90201 to rotate through the limit plug 802. At the same time, the first motor 603 can be started to drive the first gear 602 to rotate, thereby driving the inner gear ring 601 to rotate, thereby synchronously driving the shooting device 7 to move to emit light at multiple angles to the display screen 4 and shoot. After shooting is completed, the third motor 806 is started to move the arc-shaped movable tooth plate 801 away. At the same time, the rotating disk 90201 returns to the center under the action of the torsion spring 90202. Then the electric screw 901 is started to lower the receiving assembly 906 onto the sprocket conveyor 3 and align the fixed plate 90602 with the limit tooth plate.Then the fourth motor 90508 is started to push the gripping block 90503 to release the limit on the receiving assembly 906. After that, the gripping assembly 905 continues to move downward to return to its original position. At the same time, the receiving assembly 906 is moved away by the sprocket conveyor 3.

[0056] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting surface defects of a liquid crystal display screen, comprising a housing (1), characterized in that: The lower inner surface of the shell (1) is fixedly connected to a base (2), the upper surface of the base (2) is fixedly connected to a sprocket conveyor (3), the inner surface of the base (2) is provided with an inspection device (9), the upper surface of the inspection device (9) is installed with a display screen (4), the upper surface of the base (2) is fixedly connected to a fixed bracket (5), the upper surface of the fixed bracket (5) is provided with a rotating device (6), a moving device (8) is provided between the fixed brackets (5), and the upper surface of the rotating device (6) is provided with a shooting device (7).

2. The device for detecting surface defects of a liquid crystal display according to claim 1, wherein: The inspection device (9) comprises an electric screw (901), a turntable assembly (902), a tilting assembly (903), a movable connecting block (904), a clamping assembly (905) and a receiving assembly (906), wherein the electric screw (901) is fixedly connected to the inner surface of the base (2), the turntable assembly (902) is rotatably connected to the output end of the electric screw (901), and the tilting assembly (903) is fixedly connected to the upper surface of the turntable assembly (902). The movable connecting block (904) is movably connected to the inner surface of the tilting component (903), the clamping component (905) is arranged on the upper surface of the movable connecting block (904), the upper surface of the chain of the sprocket conveyor (3) is provided with a limiting block for limiting the receiving component (906), the receiving component (906) is installed on the upper surface of the sprocket conveyor (3) through the limiting block, and the display screen (4) is installed on the upper surface of the receiving component (906).

3. The device for detecting surface defects of a liquid crystal display according to claim 2, wherein: The clamping assembly (905) includes a slide bar (90501), a spring (90502), a clamping block (90503), a bidirectional cam (90504), a camshaft (90505), a fourth gear (90506), a fifth gear (90507) and a fourth motor (90508), one end of the slide bar (90501) is slidably connected to the inner surface of the movable connection block (904), the other end of the slide bar (90501) is fixedly connected to the side surface of the clamping block (90503), the spring (90502) is sleeved on the side surface of the slide bar (90501), one end of the spring (90502) is fixedly connected to the side surface of the clamping block (90503), the other end of the spring (90502) is fixedly connected to the inner surface of the movable connection block (904), and the clamping block (9050 3) Slidingly connected to the inner surface of the movable connecting block (904), the fourth motor (90508) is fixedly connected to the inner surface of the movable connecting block (904), the fifth gear (90507) is fixedly connected to the output end of the fourth motor (90508), the camshaft (90505) is rotatably connected to the inner surface of the movable connecting block (904), the fourth gear (90506) is fixedly connected to the side surface of the camshaft (90505) located in the middle position, the fifth gear (90507) is meshed with the fourth gear (90506), two bidirectional cams (90504) are provided and are fixedly connected to the two ends of the camshaft (90505), and the side of the bidirectional cam (90504) is in contact with the outer end of the clamping block (90503) extending on the side of the movable connecting block (904).

4. The device for detecting surface defects of a liquid crystal display according to claim 2, wherein: The turntable assembly (902) comprises a rotating disk (90201), a torsion spring (90202) and a fixed rod (90203), wherein the lower end of the fixed rod (90203) is fixedly connected to the output end of the electric screw rod (901), the rotating disk (90201) is rotatably connected to the upper surface of the fixed rod (90203), the upper end of the torsion spring (90202) is fixedly connected to the lower surface of the rotating disk (90201), and the lower end of the torsion spring (90202) is fixedly connected to the side surface of the fixed rod (90203).

5. The device for detecting surface defects of a liquid crystal display screen according to claim 4, characterized in that: The tilting assembly (903) includes a fixed connection block (90301), a third gear (90302), a worm wheel (90303), a worm (90304) and a sixth gear (90305). The sixth gear (90305) is fixedly connected to the inner surface of the rotating disk (90201). The worm (90304) is fixedly connected to the output end of the sixth gear (90305). The worm wheel (90303) is meshed with the worm (90304). The third gear (90302) is fixedly connected to the worm gear (90303) and is rotatably connected to the inner surface of the rotating disk (90201). The lower end of the movable connection block (904) is provided with an arc-shaped tooth plate. The third gear (90302) is meshedly connected to the arc-shaped tooth plate. The fixed connection block (90301) is fixedly connected to the upper surface of the rotating disk (90201). The lower end of the movable connection block (904) is movably connected to the inner surface of the fixed connection block (90301).

6. The device for detecting surface defects of a liquid crystal display screen according to claim 2, wherein: The receiving assembly (906) includes a receiving block (90601), a fixing plate (90602), a limiting bracket (90603), a second screw rod (90604) and a gasket (90605), wherein the fixing plate (90602) is fixedly connected to the front and rear ends of the receiving block (90601), the receiving block (90601) is mounted on the limiting tooth plate on the sprocket conveyor (3) through the fixing plate (90602), the lower end of the limiting bracket (90603) is fixedly connected to the upper surface of the receiving block (90601) at the edge, the second screw rod (90604) is threadedly connected to the inner side surface of the upper end of the limiting bracket (90603), and the gasket (90605) is fixedly connected to the lower end of the second screw rod (90604).

7. The device for detecting surface defects of a liquid crystal display screen according to claim 1, wherein: The rotating device (6) comprises an inner gear ring (601), a first gear (602) and a first motor (603); the inner gear ring (601) is rotatably connected to the inner surface of the fixed bracket (5); the first motor (603) is fixedly connected to the inner surface of the fixed bracket (5); the lower end of the first gear (602) is fixedly connected to the output end of the first motor (603); and the inner ring surface of the inner gear ring (601) is meshed with the first gear (602).

8. The device for detecting surface defects of a liquid crystal display screen according to claim 1, wherein: The moving device (8) comprises an arc-shaped moving tooth plate (801), a limit plug (802), a second gear (803), a second motor (804), a first screw rod (805), a third motor (806) and a moving block (807), wherein the third motor (806) is fixedly connected to the inner surface of the fixed bracket (5), one end of the first screw rod (805) is fixedly connected to the output end of the third motor (806), and the other end of the first screw rod (805) is rotatably connected to the inner surface of the fixed bracket (5), and the moving block (80 7) is threadedly connected to the side surface of the first screw rod (805), the second motor (804) is fixedly connected to the inner surface of the moving block (807), the lower end of the second gear (803) is fixedly connected to the output end of the second motor (804), the second gear (803) is meshed with the outer ring of the arc-shaped moving tooth plate (801), the arc-shaped moving tooth plate (801) is movably connected to the inner surface of the moving block (807), and the second gear (803) is provided with a plurality of gears distributed and connected to the inner ring surface of the arc-shaped moving tooth plate (801).

9. The device for detecting surface defects of a liquid crystal display screen according to claim 7, wherein: The photographing device (7) comprises an arc-shaped moving rod (701), a first limiting block (702), a second limiting block (703), an electric roller (704), a lighting plate (705), a limiting pin (706), a support frame (707) and a microscopic camera (708), wherein the arc-shaped moving rod (701) is provided with multiple paths and is fixedly connected to the upper surface of the inner gear ring (601), the limiting pin (706) is fixedly connected to the side surfaces of the support frame (707) and the microscopic camera (708), and the electric roller (704) is rotatably connected to the support frame (707). On the inner side surfaces of the first limit block (702) and the second limit block (703), the first limit block (702) is fixedly connected to the right side surface of the support frame (707), and the second limit block (703) is fixedly connected to the right side surface of the microscope camera (708). The support frame (707) and the microscope camera (708) are movably connected to the inner side surface of the arc-shaped moving rod (701) through a limit pin (706) and an electric roller (704), respectively. The lighting plate (705) is fixedly connected to the left side surface of the support frame (707).

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