Thickness detection device for television back panel production

Abstract

The invention relates to the technical field of thickness detection, and discloses a thickness detection device for television back panel production, which comprises a detection rack and a panel transmission machine, the panel transmission machine passes through the detection area of the detection rack, the detection area of the panel transmission machine is provided with a panel flattening laser, and the panel flattening laser is used for detecting the thickness of a television back panel when the thickness of the television back panel is detected. Blowing out high-pressure gas to blow flat the to-be-detected area; the panel flattening laser comprises a first laser sensor, a plurality of air blowing cylinders, a blasting part and a control part, the air blowing cylinders are evenly distributed on the two sides of the first laser sensor, air spraying heads capable of adjusting the air spraying diameter are arranged at the air spraying ends of the air blowing cylinders, and each air spraying head comprises a rotating wall and a rubber wall. The laser sensing technology and the high-pressure gas blowing-flat technology are ingeniously fused, the detection precision and efficiency are remarkably improved, the surface distance of the backlight plate is monitored in real time through the first laser sensor, once abnormal arching is detected, the control piece is immediately triggered to adjust the gas spraying diameter of the gas spraying head, and tiny arching is effectively blown flat.

Description

Technical Field

[0001] The present invention relates to the field of thickness detection, and more specifically, to a thickness detection device for producing a TV back panel. Background Art

[0002] The back panel usually refers to the rear structure or components of a TV. It may contain a variety of electronic components, circuit boards and backlight panels. These electronic components, circuit boards and backlight panels work together to realize the various functions of the TV. The backlight panel is a specific component in an LCD TV. It is responsible for providing the light source required for the LCD screen. In TV production, in order to ensure the quality of the TV, the thickness of the backlight panel needs to be tested.

[0003] In the process of thickness detection of TV backlight panels, efficient transmission equipment is used to transport the backlight panels one by one and in an orderly manner to the laser detection area of ​​the thickness detection equipment. When the backlight panels are placed on the transmission equipment, the equipment will stably and accurately transport the backlight panels to the laser thickness detection area according to the preset speed and path;

[0004] In this area, the laser sensor uses the reflection principle of the laser beam to measure the thickness of the backlight plate in a non-contact manner. When the laser beam irradiates the surface of the backlight plate, part of the light will be reflected back. The laser sensor calculates the thickness of the backlight plate by accurately measuring the time or angle change of the reflected light.

[0005] However, when testing the thickness of a TV backlight panel, the backlight panel is sent to the laser thickness detection area of ​​the thickness detection equipment in sequence through a transmission device, and the thickness of the backlight panel is detected by a laser sensor. During the detection, some backlight panels may be slightly arched, causing the reflected light to deviate from the original path. This deviation in the reflection angle will cause the signal received by the laser sensor to change, which may lead to deviations in the measurement data. For this reason, we propose a thickness detection device for TV back panel production. Summary of the invention

[0006] The present invention provides a thickness detection device for TV back panel production, which solves the technical problem in the related art that a backlight panel is slightly arched, causing reflected light to deviate from an original path, resulting in deviation in measurement data.

[0007] The present invention provides a thickness detection device for TV back panel production, comprising: a detection rack and a panel conveyor, the panel conveyor passes through a detection area of ​​the detection rack, and the detection area of ​​the panel conveyor is provided with a panel leveling laser, which is used to blow out high-pressure gas to level the area to be tested when detecting the thickness of the TV backlight panel;

[0008] The panel leveling laser includes a laser sensor, an air blower, an explosive punch and a control unit. There are several air blowers, which are distributed on both sides of the laser sensor. The jet end of the air blower is provided with an air jet head with an adjustable jet diameter. The air jet head includes a rotating wall and a rubber wall, and the two are staggered to form a hollow frustum. The explosive punch is arranged in the air blower, and the two share a jet end.

[0009] The control component is connected to the burst component and the jet head respectively. When the distance Y from the laser sensor to the surface of the backlight panel is less than the standard value, the control component controls the jet diameter of the jet head to decrease, thereby increasing the impact of the airflow on the backlight panel to be tested. As the jet time increases, the jet diameter gradually decreases until it reaches the minimum value. When the minimum value is reached, the burst component is controlled to instantly release high-pressure gas to impact the tested area.

[0010] Furthermore, a group of laser sensors 2 are installed in the gap of the material transfer roller of the panel conveyor, and laser sensor 2 is located directly below the detection frame, laser sensor 2 and laser sensor 1 are aligned with each other, the distance from laser sensor 1 to the surface of the backlight panel is Y, the distance from laser sensor 2 to the back of the backlight panel is X, the distance between laser sensor 2 and laser sensor 1 is T, and the thickness of the backlight panel is T minus X minus Y.

[0011] Furthermore, the panel leveling laser also includes a mounting frame, a laser sensor 1 and an air cylinder are fixed on the mounting frame, the top ends of several air cylinders are interconnected through air supply pipes, and an air pump is provided at the air supply end of the air supply pipe, and the air supply pipe is a multi-way pipe.

[0012] Furthermore, the control component includes an electric push rod, and the electric push rod is fixed on the mounting frame. A pull wire plate is fixed on the telescopic arm of the electric push rod, and a plurality of regulating pull wires are fixed on the pull wire plate. The plurality of regulating pull wires correspond one-to-one to a plurality of air cylinders for controlling the jet diameter of the jet head.

[0013] Furthermore, a lifting ring is fixed to one end of several regulating wires away from the wire pulling plate, and the lifting ring is sleeved on the outside of the blowing tube. At the same time, the lifting ring is slidably connected to the blowing tube. A guide column is passed through the wall panel of the lifting ring. A spring is sleeved on the outside of the guide column above the lifting ring. The lifting ring is slidably connected along the guide column, and the guide column is fixedly connected to the nozzle.

[0014] Furthermore, the rotating wall is rotatably connected to the nozzle, and the diameters of the rotating wall and the rubber wall gradually increase from bottom to top. The outer walls of several rotating walls are fixedly provided with draw wires, and the end of the draw wires away from the rotating wall is fixedly connected to the lifting ring. The bottom ends of two adjacent rotating walls are also fixedly provided with elastic drawstrings.

[0015] Furthermore, the explosive component includes a pressure-bearing air cylinder fixed inside the blowing cylinder, the outer wall diameter of the pressure-bearing air cylinder is smaller than the inner wall diameter of the blowing cylinder, and the air flowing into the blowing cylinder from the air supply pipe passes through the gap between the inner wall of the blowing cylinder and the outer wall of the pressure-bearing air cylinder and is ejected from the nozzle.

[0016] Furthermore, a piston is slidably arranged inside the pressure gas cylinder, an air injection pipe is passed through the interior of the piston, the piston is slidably connected to the air injection pipe and the inner wall of the pressure gas cylinder respectively, a spring 2 is sleeved on the outside of the air injection pipe above the piston, an air supply end of the air injection pipe is connected to an air supply branch pipe, and the air supply branch pipe and the air supply pipe are interconnected, a part of the air in the air supply pipe enters the space below the piston through the air injection pipe.

[0017] Furthermore, a follower column is fixedly arranged below the piston, and an air blocking plate is fixedly arranged below the follower column. A soft rubber plug is fixedly arranged at the center position of the air blocking plate, and the diameter of the soft rubber plug is larger than the internal diameter of the air injection tube. At the same time, the center of the soft rubber plug is aligned with the center of the air injection tube.

[0018] Furthermore, an inner ring is fixedly provided inside the air outlet end of the pressure air cylinder, and a buckle nose and a closing plate are respectively provided on both sides of the lower wall of the inner ring. Both the buckle nose and the closing plate are rotatably connected to the inner ring through a torsion spring, a piston is fixedly connected to the side of the buckle nose away from the closing plate, and a pull-back rope is fixedly connected in the groove between the closing plate and the inner ring.

[0019] The beneficial effects of the present invention are:

[0020] The present invention skillfully combines laser sensing and high-pressure gas blowing technology, significantly improving the detection accuracy and efficiency. The laser sensor monitors the distance of the backlight surface in real time. Once an abnormal arch is detected, the control component is immediately triggered to adjust the jet diameter of the jet head. This dynamic adjustment mechanism ensures that the airflow can accurately impact the area to be tested and effectively blow away the tiny arches, providing a flatter reference surface for thickness detection. In addition, the parallel arrangement of multiple blow cylinders enhances the blowing effect and ensures the uniformity of the entire detection area. As the jet diameter gradually decreases, the airflow impact force gradually increases until the best blowing effect is achieved. This design not only improves the accuracy of detection, but also reduces the misjudgment rate caused by the uneven backlight plate.

[0021] The built-in bursting part further enhances the device's response capability. When the jet head reaches the minimum jet diameter and still cannot completely blow the backlight panel flat, the bursting part can instantly release high-pressure gas to generate a strong impact force, quickly blowing the backlight panel to a flat state. This instantaneous correction capability ensures that accurate thickness detection results can be obtained even when the backlight panel is severely arched. At the same time, the bursting part and the jet head share the jet end, which simplifies the structure and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the laser sensor 2 of the present invention;

[0024] Figure 3 It is a schematic diagram of the overall main structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the mounting frame of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the nozzle of the present invention;

[0027] Figure 6 It is a schematic diagram of the internal structure of the air blowing cylinder of the present invention;

[0028] Figure 7 It is a schematic diagram of the internal structure of the pressure-bearing gas cylinder of the present invention;

[0029] Figure 8 is a schematic diagram of the closed structure of the occluding plate of the present invention;

[0030] Fig. 9 is a schematic diagram of the opening structure of the closure plate of the present invention;

[0031] Fig.10 It is a demonstration schematic diagram of the laser sensor 1 and the laser sensor 2 of the present invention.

[0032] In the figure: 11, detection rack; 12, panel conveyor; 2, panel leveling laser; 21, mounting frame; 22, laser sensor 1; 23, air blower; 24, air jet; 25, electric push rod; 26, wire drawing board; 27, regulating wire; 28, lifting ring; 29, rotating wall; 201, rubber wall; 202, cinch band; 203, wire drawing; 204, guide column; 205, spring 1; 206, air supply pipe; 207, air pump parts; 3, laser sensor 2; 41, pressure air cylinder; 42, air supply branch pipe; 43, air release wire drawing; 44, piston; 45, air injection pipe; 46, spring 2; 47, follow-up column; 48, air blocking plate; 49, soft rubber plug; 401, inner ring; 402, buckle nose; 403, closure plate; 404, pull-back rope. DETAILED DESCRIPTION

[0033] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a thickness detection device for TV back panel production includes: a detection rack 11 and a panel conveyor 12, the panel conveyor 12 passes through the detection area of ​​the detection rack 11, and the detection area of ​​the panel conveyor 12 is provided with a panel leveling laser 2, which is used to blow out high-pressure gas to level the area to be tested when detecting the thickness of the TV backlight panel;

[0035] The panel leveling laser 2 includes a laser sensor 22, a blow tube 23, a bursting part and a control part. The blow tube 23 is provided with a plurality of blow tubes 23, and they are distributed on both sides of the laser sensor 22. The jet end of the blow tube 23 is provided with a jet head 24 with an adjustable jet diameter. The jet head 24 includes a rotating wall 29 and a glue wall 201, and the two are staggered to form a hollow frustum. The bursting part is provided in the blow tube 23, and the two share a jet end.

[0036] The control component is connected to the burst component and the jet head 24 respectively. When the distance Y from the laser sensor 22 to the surface of the backlight panel is less than the standard value, the control component controls the jet diameter of the jet head 24 to decrease, thereby increasing the impact of the airflow on the backlight panel to be tested area. As the jet time increases, the jet diameter is gradually reduced until it reaches the minimum value. When the minimum value is reached, the burst component is controlled to instantly release high-pressure gas to impact the tested area.

[0037] like Figure 1 and Fig.10 As shown, a group of laser sensors 23 are installed in the gap of the material transfer roller of the panel conveyor 12, and the laser sensor 23 is located directly below the detection frame 11, the laser sensor 23 and the laser sensor 1 22 are aligned with each other, the distance from the laser sensor 1 22 to the surface of the backlight panel is Y, the distance from the laser sensor 23 to the back of the backlight panel is X, the distance between the laser sensor 23 and the laser sensor 1 22 is T, and the thickness of the backlight panel is T minus X minus Y.

[0038] The panel leveling laser 2 also includes a mounting frame 21, the laser sensor 22 and the air blow cylinder 23 are fixed on the mounting frame 21, the top ends of the plurality of air blow cylinders 23 are interconnected through an air supply pipe 206, and an air pump 207 is provided at the air supply end of the air supply pipe 206, and the air supply pipe 206 is a multi-way pipe.

[0039] The control component includes an electric push rod 25, and the electric push rod 25 is fixed on the mounting frame 21. A pull wire plate 26 is fixedly provided on the telescopic arm of the electric push rod 25. A plurality of regulating pull wires 27 are fixed on the pull wire plate 26. The plurality of regulating pull wires 27 correspond one-to-one to a plurality of air cylinders 23 and are used to control the jet diameter of the jet head 24.

[0040] like Figure 5 and Figure 6 As shown, a lifting ring 28 is fixed to one end of each of the regulating pull wires 27 away from the pull wire plate 26, and the lifting ring 28 is sleeved on the outside of the blowing tube 23. At the same time, the lifting ring 28 is slidably connected to the blowing tube 23. A guide column 204 is passed through the wall panel of the lifting ring 28. A spring 205 is sleeved on the outside of the guide column 204 above the lifting ring 28. The lifting ring 28 is slidably connected along the guide column 204, and the guide column 204 is fixedly connected to the nozzle 24.

[0041] The rotating wall 29 is rotatably connected to the nozzle 24, and the diameters of the rotating wall 29 and the rubber wall 201 gradually increase from bottom to top. The outer walls of several rotating walls 29 are fixedly provided with a draw wire 203, and the end of the draw wire 203 away from the rotating wall 29 is fixedly connected to the lifting ring 28, and the bottom ends of two adjacent rotating walls 29 are also fixedly provided with an elastic drawstring 202.

[0042] The explosive component includes a pressure-bearing air cylinder 41 fixed inside the air cylinder 23, the outer wall diameter of the pressure-bearing air cylinder 41 is smaller than the inner wall diameter of the air cylinder 23, and the air flowing into the air cylinder 23 through the air supply pipe 206 passes through the gap between the inner wall of the air cylinder 23 and the outer wall of the pressure-bearing air cylinder 41, and is ejected from the nozzle 24.

[0043] like Figure 7 , Figure 8 and Fig. 9 As shown, a piston 44 is slidably provided inside the pressure gas cylinder 41, and an air injection pipe 45 is penetrated inside the piston 44. The piston 44 is slidably connected to the air injection pipe 45 and the inner wall of the pressure gas cylinder 41 respectively. A spring 46 is sleeved on the outside of the air injection pipe 45 above the piston 44. The air supply end of the air injection pipe 45 is connected to an air supply branch pipe 42, and the air supply branch pipe 42 is interconnected with the air supply pipe 206. A part of the air in the air supply pipe 206 enters the space below the piston 44 through the air injection pipe 45.

[0044] A follower column 47 is fixedly provided below the piston 44, and an air blocking plate 48 is fixedly provided below the follower column 47. A soft rubber plug 49 is fixedly provided at the center position of the air blocking plate 48, and the diameter of the soft rubber plug 49 is larger than the internal diameter of the air injection tube 45. At the same time, the center of the soft rubber plug 49 is aligned with the center of the air injection tube 45.

[0045] An inner ring 401 is fixedly provided inside the air outlet end of the pressure air cylinder 41, and a buckle nose 402 and a closure plate 403 are respectively provided on both sides of the lower wall of the inner ring 401. Both the buckle nose 402 and the closure plate 403 are rotatably connected to the inner ring 401 through a torsion spring, and a piston 44 is fixedly connected to the side of the buckle nose 402 away from the closure plate 403, and a pull-back rope 404 is fixedly connected in the groove between the closure plate 403 and the inner ring 401.

[0046] The backlight panel to be inspected is placed on the panel conveyor 12, and the conveying roller of the panel conveyor 12 conveys the backlight panel to the inspection area below the laser sensor 22. Then, the laser sensor 22 and the laser sensor 23 are started at the same time. Since the distance from the laser sensor 22 to the surface of the backlight panel is Y, the distance from the laser sensor 23 to the back of the backlight panel is X, the distance between the laser sensor 23 and the laser sensor 22 is T, and the thickness of the backlight panel is T minus X minus Y, the system obtains the Y value through the operation of the laser sensor 22. If the Y value is less than the standard value, the backlight panel appears to be arched upward.

[0047] At this time, the air pump 207 and the electric push rod 25 are controlled by the system to work, and the gas output by the air pump 207 is evenly supplied to the multiple air cylinders 23 through the air supply pipe 206. The high-pressure gas is ejected downward through the air jet head 24 and impacts the detection area of ​​the backlight panel to be detected, so that the slightly arched backlight panel is flattened under pressure;

[0048] The initial state of the electric push rod 25 is the state of tightening the control wire 27. If the data measured by the laser sensor 22 is still the arched state of the backlight panel under the impact of this airflow, the system controls the electric push rod 25 to gradually relax the control wire 27, and at the same time, the lifting ring 28 is pushed downward by the elasticity of the spring 205 to relax the mouth wire 203. At the same time, under the elasticity of the drawstring 202, the spacing of the rotating wall 29 is gradually contracted. Because the rubber wall 201 itself has elasticity, the air outlet of the air jet head 24 is gradually reduced. Under the impact of the same airflow, the diameter of the air jet head 24 is reduced, and the impact force of the airflow impacting the backlight panel increases until the data measured by the laser sensor 22 is the standard value;

[0049] A portion of the gas supplied by the gas supply pipe 206 flows into the pressure gas cylinder 41 through the gas supply branch pipe 42 and the gas injection pipe 45. As the gas pressure in the pressure gas cylinder 41 gradually increases, the piston 44 is pushed to slide upward until the gas pressure below the piston 44 in the pressure gas cylinder 41 reaches a specified value. The piston 44 rises to a specified position, thereby driving the soft rubber plug 49 to block the gas injection pipe 45, thereby preventing the air from continuing to enter.

[0050] If the diameter of the jet head 24 is reduced to the minimum state, the data measured by the laser sensor 22 is still in the state of the backlight plate being arched. At this time, the deflated wire 43 is tightened by the regulating wire 27. When the deflated wire 43 is tightened, it drives the buckle nose 402 to rotate clockwise. Under the action of the high-pressure gas in the pressure cylinder 41, the blocking plate 403 is opened instantly, and the high-pressure gas rushes out instantly, strongly impacting the backlight plate, so that it is in a flattened state at the moment of detection by the laser sensor 22.

[0051] Finally, the blocking plate 403 is driven to close again by the torsion spring and the pull rope 404, and the buckle nose 402 is buckled on the blocking plate 403 again;

[0052] Through the cooperation of the laser sensor 1 22 and the laser sensor 2 3, the thickness of the backlight plate can be accurately measured, and even if there is a slight bulge in the backlight plate, it can be accurately detected;

[0053] According to the measurement results, the device can automatically adjust the jet diameter and impact force of the jet head 24 to ensure that the backlight plate is in a flattened state during the detection, thereby improving the accuracy of the thickness detection;

[0054] The jet head 24 allows the jet diameter to be dynamically adjusted according to the degree of arching of the backlight panel, and the precise control of the jet diameter is achieved through the cooperation of the electric push rod 25 and the regulating pull wire 27.

[0055] The elastic design of the drawstring 202 and the rotating wall 29 further enhances the adaptability of the air jet head 24 to the arched backlight panel, ensuring that the airflow can evenly and powerfully impact the area to be tested;

[0056] The design of the explosive impact piece can instantly release high-pressure gas to perform a strong impact when the air jet head 24 cannot completely level the backlight board, ensuring that the backlight board is in a completely leveled state at the moment of detection.

[0057] The coordinated work of the pressure-bearing gas cylinder 41, the piston 44, the soft rubber plug 49 and other components realizes the precise control and instantaneous release of the high-pressure gas, thereby improving the correction efficiency.

[0058] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A thickness detection device for TV back panel production, characterized in that: include: A detection rack (11) and a panel conveyor (12), wherein the panel conveyor (12) passes through a detection area of ​​the detection rack (11), and the detection area of ​​the panel conveyor (12) is provided with a panel leveling laser (2) for blowing out high-pressure gas to level the area to be tested when testing the thickness of a television backlight panel; The panel leveling laser (2) comprises a laser sensor (22), an air blower (23), an explosive component and a control component. The air blower (23) is provided in a plurality and is distributed on both sides of the laser sensor (22). The air blower (23) is provided with an air jet head (24) with an adjustable air jet diameter at the air jet end. The air jet head (24) comprises a rotating wall (29) and a rubber wall (201), and the two are staggered to form a hollow frustum. The explosive component is provided in the air blower (23), and the two share a common air jet end. The control component is connected to the burst component and the jet head (24) respectively. When the distance Y between the laser sensor 1 (22) and the surface of the backlight panel is less than a standard value, the control component controls the jet diameter of the jet head (24) to decrease, thereby increasing the impact of the airflow on the backlight panel to be tested area. As the jet time increases, the jet diameter is gradually reduced until it reaches a minimum value. When the minimum value is reached, the burst component is controlled to instantly release high-pressure gas to impact the test area.

2. A thickness detection device for TV back panel production according to claim 1, characterized in that: A group of laser sensors 2 (3) is installed in the gap of the material transfer roller of the panel conveyor (12), and the laser sensor 2 (3) is located directly below the detection frame (11). The laser sensor 2 (3) and the laser sensor 1 (22) are aligned with each other. The distance between the laser sensor 1 (22) and the surface of the backlight plate is Y, the distance between the laser sensor 2 (3) and the back of the backlight plate is X, the distance between the laser sensor 2 (3) and the laser sensor 1 (22) is T, and the thickness of the backlight plate is T minus X minus Y.

3. The thickness detection device for TV back panel production according to claim 1, characterized in that: The panel leveling laser (2) also includes a mounting frame (21), the laser sensor 1 (22) and the air blow tube (23) are both fixed on the mounting frame (21), the top ends of a plurality of the air blow tubes (23) are interconnected via an air supply pipe (206), and an air pump component (207) is provided at the air supply end of the air supply pipe (206), and the air supply pipe (206) is a multi-way pipe.

4. The thickness detection device for TV back panel production according to claim 1, characterized in that: The control component comprises an electric push rod (25), and the electric push rod (25) is fixed on the mounting frame (21), a wire drawing plate (26) is fixedly provided on the telescopic arm of the electric push rod (25), a plurality of regulating wires (27) are fixed on the wire drawing plate (26), and the plurality of regulating wires (27) correspond one-to-one to a plurality of air cylinders (23), and are used to control the jet diameter of the jet head (24).

5. A thickness detection device for TV back panel production according to claim 4, characterized in that: A lifting ring (28) is fixed to one end of each of the regulating pull wires (27) away from the pull wire plate (26), and the lifting ring (28) is sleeved on the outside of the blowing tube (23). At the same time, the lifting ring (28) is slidably connected to the blowing tube (23). A guide column (204) is passed through the wall plate of the lifting ring (28). A spring (205) is sleeved on the outside of the guide column (204) above the lifting ring (28). The lifting ring (28) is slidably connected along the guide column (204), and the guide column (204) is fixedly connected to the nozzle (24).

6. A thickness detection device for TV back panel production according to claim 5, characterized in that: The rotating wall (29) is rotatably connected to the nozzle (24), and the diameters of the rotating wall (29) and the rubber wall (201) gradually increase from bottom to top. The outer walls of several rotating walls (29) are fixedly provided with a draw wire (203), and the end of the draw wire (203) away from the rotating wall (29) is fixedly connected to the lifting ring (28), and the bottom ends of two adjacent rotating walls (29) are also fixedly provided with an elastic drawstring (202).

7. The thickness detection device for TV back panel production according to claim 3, characterized in that: The explosive component comprises a pressure-bearing air cylinder (41) fixed inside the air cylinder (23); the outer wall diameter of the pressure-bearing air cylinder (41) is smaller than the inner wall diameter of the air cylinder (23); the air flowing into the air cylinder (23) through the air supply pipe (206) passes through the gap between the inner wall of the air cylinder (23) and the outer wall of the pressure-bearing air cylinder (41) and is ejected from the nozzle (24).

8. The thickness detection device for TV back panel production according to claim 7, characterized in that: A piston (44) is slidably arranged inside the pressure-bearing gas cylinder (41), and an air injection pipe (45) is penetrated inside the piston (44). The piston (44) is slidably connected to the air injection pipe (45) and the inner wall of the pressure-bearing gas cylinder (41) respectively. A spring 2 (46) is sleeved on the outside of the air injection pipe (45) above the piston (44). The air supply end of the air injection pipe (45) is connected to an air supply branch pipe (42), and the air supply branch pipe (42) and the air supply pipe (206) are interconnected. Part of the air in the air supply pipe (206) enters the space below the piston (44) through the air injection pipe (45).

9. A thickness detection device for TV back panel production according to claim 8, characterized in that: A follower column (47) is fixedly arranged below the piston (44), and an air blocking plate (48) is fixedly arranged below the follower column (47). A soft rubber plug (49) is fixedly arranged at the center of the air blocking plate (48), and the diameter of the soft rubber plug (49) is larger than the internal diameter of the air injection tube (45), and the center of the soft rubber plug (49) is aligned with the center of the air injection tube (45).

10. A thickness detection device for TV back panel production according to claim 9, characterized in that: An inner ring (401) is fixedly arranged inside the air outlet end of the pressure-bearing air cylinder (41), and a buckle nose (402) and a blocking plate (403) are respectively arranged on both sides of the lower wall of the inner ring (401), and both the buckle nose (402) and the blocking plate (403) are rotatably connected to the inner ring (401) through a torsion spring, and a piston (44) is fixedly connected to the side of the buckle nose (402) away from the blocking plate (403), and a pull-back rope (404) is fixedly connected in the groove between the blocking plate (403) and the inner ring (401).

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