A thickness detection device for the production of TV back panels

Abstract

The present invention relates to the field of thickness detection technology, and discloses a thickness detection device for television back panel production, comprising: a detection rack and a panel conveyor, the panel conveyor passing through the detection area of the detection rack, the detection area of the panel conveyor being provided with a panel leveling laser for blowing out high-pressure gas to level the area to be measured when detecting the thickness of the television backlight panel; the panel leveling laser comprising a laser sensor, an air blower, a bursting part, and a control part, a plurality of air blowers being provided, and being distributed on both sides of the laser sensor, a nozzle with an adjustable nozzle diameter being provided at the nozzle end of the air blower, the nozzle head comprising a rotating wall and a glue wall. The present invention cleverly combines laser sensing and high-pressure gas leveling technology, significantly improving detection accuracy and efficiency, monitoring the distance to the backlight panel surface in real time through the laser sensor, and immediately triggering the control part to adjust the nozzle diameter of the nozzle head once an abnormal arch is detected, effectively leveling the tiny arch.

Description

Technical Field

[0001] The present invention relates to the field of thickness detection, and more particularly to a thickness detection device for producing television back panels. 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 LCD TVs. 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] During the thickness inspection of TV backlight panels, efficient transmission equipment is used to transport the panels one by one and in an orderly manner to the laser inspection area of the thickness inspection equipment. Once the backlight panels are placed on the transmission equipment, the equipment will stably and accurately transport the backlight panels to the laser thickness inspection 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 hits 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 panels are sequentially sent to the laser thickness detection area of the thickness detection equipment through a transmission device, and the thickness of the backlight panels 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 in turn cause 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 the backlight panel is slightly arched, causing the reflected light to deviate from the original path and resulting in deviation in the measurement data.

[0007] The present invention provides a thickness detection device for TV back panel production, comprising: a detection rack and a panel conveyor, wherein 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 for blowing out high-pressure gas to level the area to be tested when testing the thickness of the TV backlight panel;

[0008] The panel leveling laser includes a laser sensor, an air blower, a bursting part, and a control part. There are several air blowers, which are distributed on both sides of the laser sensor. The air blower's jet end is provided with an air jet head with 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 bursting part is set in the air blower, and the two share the same jet end.

[0009] The control component is connected to the explosive component and the nozzle head respectively. When the distance Y between the laser sensor and the surface of the backlight panel is less than the standard value, the control component controls the nozzle head to reduce the jet diameter, 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 explosive 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 panel conveyor roller, 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 and an air blower are fixed on the mounting frame, the top ends of several air blowers 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 part 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 number of control wires are fixed on the pull wire plate. The several control wires correspond one-to-one to a number of air cylinders for controlling the jet diameter of the jet head.

[0013] Furthermore, a lifting ring is fixed to the end of each of the regulating wires away from the wire plate, and the lifting ring is sleeved on the outside of the air tube. At the same time, the lifting ring is slidably connected to the air tube. A guide column is passed through the wall panel of the lifting ring, and 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 head.

[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 a draw wire, and the end of the draw wire away from the rotating wall is fixedly connected to the lifting ring, and the bottom ends of the two adjacent rotating walls are also fixedly provided with an elastic drawstring.

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

[0016] Furthermore, a piston is slidingly provided inside the pressure gas cylinder, and an air injection pipe is passed through the interior of the piston. The piston is slidingly connected to the air injection pipe and the inner wall of the pressure gas cylinder respectively. A spring 2 is provided on the outside of the air injection pipe above the piston. The 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. 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 provided below the piston, and an air blocking plate is fixedly provided below the follower column. A soft rubber plug is fixedly provided 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 cleverly combines laser sensing and high-pressure gas leveling technology, significantly improving detection accuracy and efficiency. The laser sensor monitors the distance to the backlight panel surface in real time. Once an abnormal arch is detected, the control unit is immediately triggered to adjust the jet diameter of the air jet head. This dynamic adjustment mechanism ensures that the airflow can accurately impact the area to be tested, effectively flattening tiny arches and providing a flatter reference surface for thickness detection. In addition, the parallel arrangement of multiple air blowers enhances the leveling effect and ensures uniformity across the entire detection area. As the jet diameter gradually decreases, the airflow impact force gradually increases until the optimal leveling effect is achieved. This design not only improves detection accuracy but also reduces the rate of false positives caused by uneven backlight panels.

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

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is the structural schematic diagram of the second laser sensor of the present invention;

[0024] Figure 3 is the front view structural schematic diagram of the whole of the present invention;

[0025] Figure 4 is the structural schematic diagram of the mounting bracket of the present invention;

[0026] Figure 5 is the structural schematic diagram of the air jet head of the present invention;

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

[0028] Figure 7 is the internal structural schematic diagram of the pressure-bearing air cylinder of the present invention;

[0029] Figure 8 is the structural schematic diagram of the closing structure of the closing plate of the present invention;

[0030] Figure 9 is the structural schematic diagram of the opening structure of the closing plate of the present invention;

[0031] Figure 10 is the demonstration schematic diagram of the first laser sensor and the second laser sensor of the present invention.

[0032] In the figure: 11, detection rack; 12, panel conveyor; 2, panel flattening laser; 21, mounting bracket; 22, first laser sensor; 23, air blowing cylinder; 24, air jet head; 25, electric push rod; 26, wire pulling plate; 27, regulating wire; 28, lifting ring; 29, rotating wall; 201, rubber wall; 202, mouth binding band; 203, pulling mouth wire; 204, guiding column; 205, first spring; 206, air supply pipe; 207, air pump part; 3, second laser sensor; 41, pressure-bearing air cylinder; 42, air supply branch pipe; 43, air leakage wire; 44, piston; 45, injection pipe; 46, second spring; 47, follower column; 48, air blocking plate; 49, soft rubber plug; 401, inner ring; 402, button nose; 403, closing plate; 404, pulling back rope. Detailed implementation manners

[0033] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect 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. The detection area of the panel conveyor 12 is provided with a panel leveling laser 2 for blowing high-pressure gas to level the test area when testing the thickness of the TV backlight panel;

[0035] The panel leveling laser 2 includes a laser sensor 22, an air blower 23, a bursting part, and a control part. The air blower 23 is provided in plurality and is distributed on both sides of the laser sensor 22. The air blower 23 has an air jet head 24 with an adjustable air jet diameter at its jet end. The air 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 air blower 23, and the two share a common air jet end.

[0036] The control component is connected to the explosive component and the nozzle head 24 respectively. When the distance Y between the laser sensor 22 and the surface of the backlight panel is less than the standard value, the control component controls the nozzle head 24 to reduce the jet diameter, 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 explosive component is controlled to instantly release high-pressure gas to impact the tested area.

[0037] like Figure 1 and Figure 10 As shown, a group of laser sensors 2 3 are installed in the gap of the 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 from the laser sensor 1 22 to the surface of the backlight panel is Y, the distance from the laser sensor 2 3 to the back of the backlight panel is X, the distance between the laser sensor 2 3 and the laser sensor 1 22 is T, and the thickness of the backlight panel is T minus X minus Y.

[0038] The panel flattening laser 2 further includes a mounting bracket 21. The first laser sensor 22 and the air blowing cylinders 23 are both fixed on the mounting bracket 21. The tops of several air blowing cylinders 23 are interconnected through an air supply pipe 206. An air pump member 207 is provided at the air supply end of the air supply pipe 206. The air supply pipe 206 is a multi-way pipe.

[0039] The control member includes an electric push rod 25 which is fixed on the mounting bracket 21. A wire pulling plate 26 is fixedly arranged on the telescopic arm of the electric push rod 25. Several control wires 27 are fixed on the wire pulling plate 26. The several control wires 27 correspond to the several air blowing cylinders 23 one by one and are used to control the jet diameter of the jet head 24.

[0040] Such as Figure 5 and Figure 6 As shown, one lifting ring 28 is fixed at one end of each of the several control wires 27 away from the wire pulling plate 26. The lifting ring 28 is sleeved outside the air blowing cylinder 23. At the same time, the lifting ring 28 is slidably connected to the air blowing cylinder 23. A guide post 204 is penetrated through the wall plate of the lifting ring 28. A first spring 205 is sleeved outside the guide post 204 above the lifting ring 28. The lifting ring 28 is slidably connected along the guide post 204. The guide post 204 is fixedly connected to the jet head 24.

[0041] The rotating wall 29 is rotatably connected to the jet head 24. The diameter dimensions of both the rotating wall 29 and the rubber wall 201 gradually increase from bottom to top. A pulling wire 203 is fixedly arranged on the outer wall of each of the several rotating walls 29. One end of the pulling wire 203 away from the rotating wall 29 is fixedly connected to the lifting ring 28. An elastic mouth binding belt 202 is also fixedly arranged at the bottom ends of two adjacent rotating walls 29.

[0042] The explosion impact member includes a pressure-bearing air cylinder 41 fixed inside the air blowing cylinder 23. The outer wall diameter dimension of the pressure-bearing air cylinder 41 is smaller than the inner wall diameter dimension of the air blowing cylinder 23. The air flowing into the air blowing cylinder 23 through the air supply pipe 206 sprays out from the jet head 24 through the gap between the inner wall of the air blowing cylinder 23 and the outer wall of the pressure-bearing air cylinder 41.

[0043] Such as Figure 7 、 Figure 8 and Figure 9 As shown, a piston 44 is slidably arranged inside the pressure-bearing air cylinder 41. An injection pipe 45 is penetrated through the piston 44. The piston 44 is slidably connected to both the injection pipe 45 and the inner wall of the pressure-bearing air cylinder 41. A second spring 46 is sleeved outside the injection pipe 45 above the piston 44. The air supply end of the injection pipe 45 is connected to an air supply branch pipe 42. 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 lower space of the piston 44 through the injection pipe 45.

[0044] A follower column 47 is fixedly arranged below the piston 44, and a gas blocking plate 48 is fixedly arranged below the follower column 47. A soft rubber plug 49 is fixedly arranged at the center position of the gas blocking plate 48. The diameter of the soft rubber plug 49 is larger than the inner diameter of the injection pipe 45. At the same time, the centers of the soft rubber plug 49 and the injection pipe 45 are aligned with each other.

[0045] An inner ring 401 is fixedly arranged inside the air outlet end of the pressure-bearing air cylinder 41. On both sides of the lower wall of the inner ring 401, a snap nose 402 and a closing plate 403 are respectively arranged. Both the snap nose 402 and the closing plate 403 are rotationally connected to the inner ring 401 through torsion springs. A piston 44 is fixedly connected to the side of the snap nose 402 away from the closing plate 403. A pull-back rope 404 is fixedly connected in the groove between the closing plate 403 and the inner ring 401.

[0046] The backlight panel to be detected is placed on the panel conveyor 12. The panel conveyor 12 conveys the backlight panel to be detected to the detection area below the laser sensor one 22 through the conveyor rollers. Then, the laser sensor one 22 and the laser sensor two 3 are started simultaneously. Since the distance from the laser sensor one 22 to the surface of the backlight panel is Y, the distance from the laser sensor two 3 to the back of the backlight panel is X, and the distance between the laser sensor two 3 and the laser sensor one 22 is T, the thickness of the backlight panel is T minus X minus Y. The system obtains the value of Y through the operation of the laser sensor one 22. If the value of Y is less than the standard value, this backlight panel has the phenomenon of arching upward;

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

[0048] The initial state of the electric push rod 25 is the state of tightening the regulation pull wire 27. If the data measured by the laser sensor one 22 is still in the arched state of the backlight panel under the impact of this air flow, the system controls the electric push rod 25 to gradually loosen the regulation pull wire 27. At the same time, the lifting ring 28 is pushed downward to slide through the elasticity of the spring one 205, so that the pull wire 203 is loosened. At the same time, under the elasticity of the binding belt 202, the distance between the rotating walls 29 is gradually reduced. 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 air flow, the diameter of the air jet head 24 is reduced, and the impact force of the air flow on the backlight panel is increased until the data measured by the laser sensor one 22 is the standard value;

[0049] A portion of the gas supplied by the gas supply pipe 206 flows into the pressure cylinder 41 through the gas supply branch pipe 42 and the gas injection pipe 45. As the gas pressure in the pressure cylinder 41 gradually increases, the piston 44 is pushed upward. When the gas pressure below the piston 44 in the pressure 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, preventing further air from entering.

[0050] If the diameter of the nozzle 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 air release wire 43 is tightened by the control wire 27. When the air release 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, causing it to be flattened 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 onto the blocking plate 403 again;

[0052] By cooperating with the laser sensor 1 22 and the laser sensor 2 3, the thickness of the backlight plate can be accurately measured, and even a slight bulge in the backlight plate 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 flat state during detection, thereby improving the accuracy of thickness detection;

[0054] The nozzle head 24 allows the nozzle diameter to be dynamically adjusted according to the degree of arching of the backlight panel. The nozzle diameter can be precisely controlled through the cooperation of the electric push rod 25 and the regulating wire 27.

[0055] The elastic design of the constriction band 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 panel, ensuring that the backlight panel 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 has described the embodiments of this example, but this example is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of this example, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this example.

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) includes a laser sensor (22), an air blower (23), an explosive component and a control component. The air blower (23) is provided in 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) includes a rotating wall (29) and a glue 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 backlight panel surface 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 measured. 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 area to be measured.

2. The 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 from the laser sensor 1 (22) to the surface of the backlight plate is Y, the distance from the laser sensor 2 (3) to 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) further comprises a mounting frame (21), the laser sensor (22) and the air blower (23) are both fixed on the mounting frame (21), the top ends of a plurality of the air blowers (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 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 fixed on the telescopic arm of the electric push rod (25), and a plurality of regulating pull wires (27) are fixed on the pull wire plate (26). The plurality of regulating pull wires (27) correspond to a plurality of blowing cylinders (23) one by one, and are used to control the jet diameter of the jet head (24).

5. The 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 cylinder (23). At the same time, the lifting ring (28) is slidably connected to the blowing cylinder (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 head (24).

6. The 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 drawstring (203), and the end of the drawstring (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 provided inside the pressure-bearing gas cylinder (41), and an air injection pipe (45) is passed through the interior of 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 communicated with each other. A part of the air in the air supply pipe (206) enters the space below the piston (44) through the air injection pipe (45).

9. The thickness detection device for TV back panel production according to claim 8, characterized in that: 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 of the air blocking plate (48), and the diameter of the soft rubber plug (49) is larger than the inner 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).

10. The thickness detection device for TV back panel production according to claim 9, characterized in that: An inner ring (401) is fixedly provided inside the air outlet end of the pressure-bearing air cylinder (41), and a buckle nose (402) and a blocking plate (403) are respectively provided on both sides of the lower wall of the inner ring (401). Both the buckle nose (402) and the blocking plate (403) are rotatably connected to the inner ring (401) via a torsion spring. 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 to the groove between the blocking plate (403) and the inner ring (401).

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