A liquid crystal screen dot test clamping device

Abstract

This utility model relates to a clamping device, providing a clamping device for testing LCD screens, including a base, a worktable, a pad, and a power supply module. The worktable is mounted on the base, and the pad is laid on the worktable. The power supply module is installed on one side of the pad, providing power to the LCD screen to be tested. This utility model, by setting four independently movable clamping components, allows for rapid adjustment of the clamping position during clamping, eliminating the need for manual disassembly or reinstallation of the clamps. This enables rapid adaptive clamping of screens of different sizes, solving the cumbersome operation problem of frequent clamp disassembly and reassembly required by traditional structures, and improving production efficiency. Simultaneously, each clamping component precisely controls the clamping force through a pneumatic damper, preventing screen wobbling due to excessively loose clamping and edge deformation due to excessively tight clamping.

Description

Technical Field

[0001] This utility model relates to a clamping device, and more particularly to a clamping device for testing LCD screen dot-mapping. Background Technology

[0002] In the manufacturing process of LCD screens, screen testing is a crucial step in ensuring product quality. This test requires fixing the LCD screen in a specific position to comprehensively test its display performance, touch functionality, and other aspects. With the diversification of LCD screen sizes and types, and the continuous improvement of production efficiency and automation, designing a testing device capable of stable clamping, precise positioning, and adaptability to various LCD screen specifications has become an industry necessity. It not only ensures the reliability of the testing process but also improves testing efficiency, making it an indispensable auxiliary device on LCD screen production lines.

[0003] However, existing LCD screen dot-mapping testing clamping devices have significant drawbacks in practical applications. Traditional dot-mapping testing clamping components typically employ a combination structure of a perforated platform and "L"-shaped fixing fixtures mounted on the platform. After the LCD screen is placed flat on the perforated platform, multiple "L"-shaped fixtures are fixed to the pre-set holes on the platform using bolts, relying on mechanical clamping to secure the screen. When testing LCD screens of different sizes (such as switching from 15 inches to 27 inches), all fixtures must be manually disassembled, the hole positions remeasured, and the clamping positions adjusted. This not only increases operational complexity but also significantly reduces production efficiency. Furthermore, the clamping force control of existing clamping components is not precise enough. Specifically, to ensure the clamped LCD screen remains stable, multiple fixtures are typically used to firmly clamp the leveled LCD screen to prevent screen wobbling during testing due to loose clamping, which would affect the accuracy of the test data. Conversely, excessive clamping can easily cause deformation of the LCD screen edges due to pressure, affecting the reliability of the test data. As a result, existing technologies are gradually showing significant limitations when facing diverse and high-efficiency production testing scenarios. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the objective is to provide a liquid crystal screen dot-mapping test clamping device.

[0005] The technical solution is as follows: A liquid crystal display screen dot-mapping test clamping device includes a base, a worktable, a pad, a power supply module, a first slide rail, a slide base, a first electric cylinder, a second slide rail, a slide base, a second electric cylinder, a pneumatic damper, an L-shaped bracket, and rollers. A worktable is mounted on the base, and a pad is laid on the worktable. A power supply module is mounted on one side of the pad, which supplies power to the liquid crystal display screen to be tested. Two parallel slide rails are provided on the front and rear sides of the upper part of the base. Each slide rail has a sliding slider. A slide base is fixedly connected between the tops of the two sliders on the front and rear slide rails on the same side. The two slide bases are symmetrically arranged. An electric cylinder is provided on the left and right sides of the upper part of the base, and the drive rod of each electric cylinder is connected to a slide base. The slide block is moved back and forth by an electric cylinder. When the slide block moves, it does not interfere with the worktable and the pad. There are two slide rails on the left and right sides of the top of the slide block. Each slide rail has a slider. Each slider of the slide rail has a slide table. There are two electric cylinders on the slide block. The drive rod of each electric cylinder is connected to a slide table. The electric cylinder drives the slide table to move left and right on the slide block. Each slide table is equipped with a pneumatic damper. Each pneumatic damper has an L-shaped bracket connected to its support rod. Rollers are rotatably connected to the two arms of the L-shaped bracket. The outer circumference of each roller is provided with an elastic buffer layer. The bottom height of the roller is the same as the top height of the pad. Through the rollers on the four L-shaped brackets, a rectangular feeding area is formed above the pad.

[0006] Furthermore, it also includes a support frame and a vision instrument. The support frame is fixedly mounted on the base, and the vision instrument is rotated on the upper part of the support frame. The vision end of the vision instrument faces the side of the pad. Each L-shaped bracket is equipped with a data processing module, and each roller has a pressure sensor inside its rotation axis. The pressure sensors are all connected to the data processing module on the same L-shaped bracket.

[0007] Furthermore, it also includes a cylinder and a rotating seat. The cylinder is vertically installed in the lower part of the support table. The upper end of the cylinder's movable rod is fixedly connected to the rotating seat. The rotating seat contains a motor. A circular groove is opened in the pad, and the support is rotatably embedded in the circular groove. The output shaft of the motor is connected to the bottom of the support.

[0008] Furthermore, it also includes an air supply module and air pipes. The interior of the platform is hollow, and there are several air ports on one side of the top of the platform. An air supply module is provided at the bottom of the workbench, and the air supply module is connected to the interior space of the platform through an air pipe.

[0009] Furthermore, it also includes a conductive connector, a silicone layer on the upper surface of the pad and the support, a conductive layer sprayed on the upper surface of the silicone layer, and a conductive connector on the pad for connecting the grounding wire.

[0010] Compared with the prior art, the present invention has the following advantages: 1. The present invention sets four independently movable clamping components, which can quickly adjust the clamping position during clamping without the need for manual disassembly or reinstallation of the clamp, thereby achieving rapid adaptive clamping of screens of different sizes. This solves the problem of cumbersome operation of frequent disassembly and reassembly of clamps in traditional structures and improves production efficiency. At the same time, each clamping component precisely controls the clamping force through a pneumatic damper, which can avoid screen shaking caused by excessively loose clamping and edge deformation caused by excessively tight clamping.

[0011] 2. When the LCD screen is placed at an angle on the support platform, the support platform can automatically rise to disengage the LCD screen from the support platform. Then, the screen posture is corrected through the precise angle adjustment function. The tilted LCD screen can be quickly calibrated to a horizontal state without manual adjustment, ensuring that the LCD screen always maintains the standard placement angle during the test and reducing the workload of manual calibration. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0013] Figure 2 This is a three-dimensional structural diagram of the base, worktable, cylinder, and other components of this utility model.

[0014] Figure 3 This is a three-dimensional structural diagram of the slide rail, slide block, and slide table components of this utility model.

[0015] Figure 4 This is a three-dimensional structural diagram of the electric cylinder, L-shaped bracket, rollers, and other components of this utility model.

[0016] Figure 5 This is a three-dimensional structural diagram of the components of this utility model, including the pad, rotating seat, and support.

[0017] Figure 6 This is a three-dimensional structural diagram of the components of this utility model, including the support platform, the air supply module, and the air pipe.

[0018] The components and their numbers in the diagram are as follows: 1. Base, 2. Workbench, 3. Pad, 31. Power supply module, 4. Slide rail one, 41. Slide seat, 42. Electric cylinder one, 43. Support frame, 44. Vision instrument, 5. Slide rail two, 51. Slide table, 52. Electric cylinder two, 53. Pneumatic damper, 54. L-shaped bracket, 55. Roller, 6. Conductive connector, 7. Cylinder, 71. Rotary seat, 72. Support, 8. Air supply module, 81. Air pipe, 810. Air port. Detailed Implementation

[0019] The preferred technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] Example 1

[0021] A liquid crystal screen dot-mapping test clamping device, such as Figure 1-5 As shown, the system includes a base 1, a worktable 2, a pad 3, a power supply module 31, a slide rail 4, a slide block 41, an electric cylinder 42, a slide rail 5, a slide block 51, an electric cylinder 52, a pneumatic damper 53, an L-shaped bracket 54, and rollers 55. The worktable 2 is bolted to the base 1. The pad 3 is covered with adhesive on the upper surface of the worktable 2. The pad 3 is made of insulating material, and the power supply module 31 is suspended on one side by a bracket. The power supply module 31 integrates an adjustable voltage power adapter and has a flexible ribbon cable socket matching the shape of the LCD screen interface. When the LCD screen is placed on the pad 3... The flexible cable connects to the screen interface and supplies power to the LCD screen under test with a stable voltage converted by the power adapter, ensuring the reliability of the power supply during the test. The upper part of the base 1 has two parallel slide rails 4 fixed to the front and rear sides by bolts. Each slide rail 4 has a slider that is slidably embedded in it. The top of the two sliders on the front and rear slide rails 4 are fixedly connected to the slide seats 41 by welding. The two slide seats 41 are symmetrically arranged front and rear. The upper part of the base 1 has electric cylinders 42 installed on the left and right sides by flanges. The drive rod of each electric cylinder 42 can be equipped with a floating joint to connect to the side of the slide seat 41. The floating joint can compensate for installation errors.

[0022] When the electric cylinder 42 is energized, the drive rod extends and retracts, driving the slide 41 to move back and forth along the slide rail 4 through the spherical fit of the floating joint, ensuring that the slide 41 moves smoothly. The bottom of the slide 41 is reserved with the top surface of the worktable 2, so that it does not interfere with the worktable 2 and the pad 3 when moving. The top left and right sides of the slide 41 are fixed with the slide rail 5 by bolts. The slide rail 5 is slidably embedded with the slider. The slider of the slide rail 5 is fixed with the slide table 51 by screws. Two electric cylinders 52 are installed on the slide 41 at the position corresponding to the slide rail 5 by brackets. The drive rod of the electric cylinder 52 is connected to the side of the slide table 51 by the pin. The extension and retraction of the drive rod of the electric cylinder 52 drives the slide table 51 to move left and right on the slide 41. The upper surface of the slide table 51 is installed with the pneumatic damper 53 by bolts.

[0023] like Figure 4As shown, the strut of the pneumatic damper 53 is connected to an L-shaped bracket 54 by a thread. The L-shaped bracket 54 consists of a main arm and a side arm vertically connected to the end of the main arm. Rollers 55 are rotatably connected to the main arm and the side arm of the L-shaped bracket through bearings. The rollers 55 on the main arm correspond to the front and rear sides of the pad 3, and the rollers 55 on the side arm correspond to the left and right sides of the pad 3. The outer circumference of the rollers 55 is covered with an elastic buffer layer. The bottom height of the rollers 55 is adjusted by the bracket to be consistent with the top height of the pad 3. When the rollers 55 on the four L-shaped brackets 54 move into place, they will form a rectangular material feeding area above the pad 3. When the LCD screen is placed in this area, the electric cylinder 42 and the electric cylinder 52 drive the roller 55 to move to the edge of the screen. The pneumatic damper 53 provides flexible clamping force through internal air pressure buffer. When the elastic buffer layer comes into contact with the screen frame, it deforms, which can not only firmly clamp the screen but also avoid damage caused by hard squeezing. The main arm roller and the side arm roller cooperate to form a stable structure with front and rear main clamping and left and right auxiliary limiting.

[0024] For square LCD screens of different sizes, during the initial operation, place the screen face up gently in the relatively central area of ​​the pad 3, and perform appropriate positional correction on the screen. At this time, the screen will fall completely into the rectangular feeding area enclosed by the four rollers 55. Connect the LCD screen to the power supply module 31 through the interface to supply power to the screen. Then, the cooperation status and movement steps of each component during the clamping process are as follows:

[0025] Initially, the front and rear slides are at their opposite extreme positions, and the slides are at their opposite extreme positions on the slides. When the electric cylinder 42 is activated, the drive rod is controlled to move, causing the front and rear slides 41 to move synchronously to one side of the screen along the slide rail 4. When the slides 41 move, the top slide rail 5 and the slide 51 move forward synchronously. At this time, the left and right slides 51 remain in their initial positions on the slide rail 5. When the roller 55 on one side slide 51 first contacts the front edge of the screen, the pressure sensor at the roller shaft immediately sends a stop signal to the electric cylinder 42, and the slide 41 on that side stops moving. The slide 41 on the other side continues to move slowly at the set speed until the roller 55 on the other side also lightly touches the front edge of the screen. At this time, the rollers 55 on the main arms of each L-shaped bracket 54 maintain rolling contact with the front and rear bezels of the screen. After the front and rear side rollers 55 are positioned, the second electric cylinder 52 is activated, and its drive rod extends towards the screen, controlling the left and right slides 51 to move independently on the second slide rail 5. The left slide 51 moves to the right along the left slide rail 5, and the right slide 51 moves to the left along the right slide rail 5, causing the rollers 55 on the upper arms of the L-shaped bracket 54 to approach the left and right bezels of the screen, until all the rollers 55 on the side arms of the L-shaped bracket 54 contact the side bezels of the screen. After the left and right rollers 55 are in position, the two first electric cylinders 42 are activated again, causing their drive rods to retract in opposite directions, driving the front and rear slides 41 to move in opposite directions along the first slide rail 4. At this time, the strut of the pneumatic damper 53 gradually shortens as the slides move, and its internal air pressure gradually increases, causing the clamping force of the front and rear rollers 55 on the front and rear bezels of the screen to increase synchronously. During the movement, the elastic buffer layer of the roller 55 fits against the screen frame. Then, the electric cylinder 42 stops driving, and the pneumatic damper 53 maintains the current pressure, so that the front and rear rollers 55 form the main clamping force, while the left and right rollers remain in the initial limit state, and finally form a stable structure of "front and rear main clamping + left and right auxiliary limit". The screen is firmly fixed in the center of the pad 3, and the frame is subjected to flexible clamping force.

[0026] like Figure 1As shown, it also includes a support frame 43 and a vision instrument 44. The support frame 43 is fixed to the base 1 by bolts. The vision instrument 44 is rotatably connected to the upper part of the support frame 43 via a rotating shaft. The visual end of the vision instrument 44 faces the side of the pad 3. The angle of the vision instrument 44 can be adjusted by manually adjusting the angle of the rotating shaft or by driving the built-in motor, so as to clearly capture the position and placement angle of the LCD screen on the pad 3. A data processing module is embedded in the main arm of the L-shaped bracket 54. A pressure sensor is built into the rotation axis of the roller 55. The pressure sensor is connected to the data processing module on the same L-shaped bracket 54 via a wire. When the roller 55 contacts the edge of the LCD screen, the pressure sensor transmits the contact pressure signal to the data processing module. After filtering, amplification, and other processing, it is fed back to the main control module of this device or the screen test line in real time via a data line. After the vision instrument 44 is started, it performs visual positioning of the material on the pad 3, detects the position and placement angle of the LCD screen through an image recognition algorithm, and transmits the data. The main control module generates control commands based on visual positioning data, driving electric cylinders 42 and 52 to move roller 55 to the preset clamping position. During the movement, pressure sensors provide real-time feedback on contact pressure. The main control module fine-tunes the cylinder movements based on the feedback data, forming an automatic control closed loop of "visual positioning to electric cylinder driving, and then dynamic adjustment after pressure feedback." This ensures that the LCD screen is accurately clamped and subjected to uniform force, avoiding testing errors caused by positioning deviations or uneven clamping forces due to manual control. This effectively improves the automation level and testing reliability of the clamping device.

[0027] Based on Example 1: Figure 1 , Figure 5 and Figure 6 As shown, based on Embodiment 1, it also includes a cylinder 7 and a rotating seat 71. The cylinder 7 is vertically fixed to the lower part of the worktable 2 by bolts. The upper end of the movable rod of the cylinder 7 is fixedly connected to the rotating seat 71 by a flange. The rotating seat 71 is hollow inside and a motor is installed at the bottom through a sealed bearing. The output shaft of the motor extends upward. A circular groove is opened in the pad 3, and a support 72 is embedded in the circular groove. The output shaft of the motor passes through the annular guide rail and is fixedly connected to the center of the bottom of the support 72. When the movable rod of the cylinder 7 extends or retracts, it drives the rotating seat 71 and the support 72 to rise and fall synchronously, so that the top of the support 72 can be higher or lower than the surface of the pad 3. When the motor starts, it drives the support 72 to rotate through the output shaft, which is used to adjust the angle of the screen on the pad 3 so that it is in a preset standard position before being clamped; this facilitates the subsequent precise positioning and clamping by the roller 55.

[0028] Specifically, after the LCD screen is placed on the pad 3, the vision instrument 44 first detects the deviation between the screen placement angle and the preset standard orientation. The main control module sends instructions to the cylinder 7 and the motor in the rotating seat 71 based on the deviation data: the movable rod of the cylinder 7 extends, driving the support 72 to rise above the surface of the pad 3, so that the screen is no longer in contact with the pad 3. Then the motor starts to drive the support 72 to rotate, adjusting the screen to the standard orientation. After the angle calibration is completed, the movable rod of the cylinder 7 returns to the original position, driving the support 72 to fall back to the initial position, so that the screen falls smoothly back to the pad 3 and contacts the pad 3. At this time, the roller 55 moves according to the preset process to perform precise clamping. The whole process realizes the automatic calibration of the screen angle through vision detection and electromechanical linkage, ensuring the accuracy of the clamping position.

[0029] like Figure 1 , Figure 5 and Figure 6 As shown, it also includes an air supply module 8 and an air pipe 81. The interior of the support platform 72 is hollow to form an air storage cavity. Several air ports 810 are evenly distributed on the top side of the support platform 72. The air ports 810 are connected to the air storage cavity. The air supply module 8 is fixedly installed on the lower part of the workbench 2 by a bracket. The air outlet of the air supply module 8 is sealed and connected to the air inlet at the bottom of the support platform 72 through the air pipe 81. When the air supply module 8 is started, compressed air is delivered to the air storage cavity of the support platform 72 through the air pipe 81, and then sprayed upward through the air port 810 to form an air film. During the screen placement stage on the pad 3, the air supply module 8 supplies air to the air outlet 810 of the support 72, creating an air-floating gap between the screen and the top of the support 72, reducing contact friction during screen placement. After the screen placement is completed, the air supply module 8 stops supplying air, the air film disappears, and the screen is stably attached to the pad 3. When the screen is removed after testing, the air supply module 8 supplies air again, creating an air-floating gap between the screen and the support 72, reducing the resistance to screen removal, and achieving intermittent separation of the screen from the pad 3 and the support 72. This protects the screen surface from scratches and improves operational convenience.

[0030] Finally, as Figure 1 and Figure 5 As shown, it also includes a conductive connector 6. The upper surfaces of the pad 3 and the support 72 are covered with a silicone layer. The upper surface of the silicone layer is uniformly sprayed with conductive silver paste to form a conductive layer. The conductive layer is connected to the conductive lines pre-embedded inside the pad 3. The conductive connector 6 is fixedly installed at the edge of the pad 3. The conductive connector 6 is connected to an external grounding device through a wire. When the LCD screen is placed on the pad 3, the screen frame is in contact with the conductive layer. Static electricity is conducted to the ground through the conductive layer, conductive lines and conductive connector 6, avoiding static electricity accumulation that could damage the internal circuitry of the LCD screen. The silicone layer provides insulation and buffer protection for the screen surface, and also achieves reliable grounding through the conductive layer, ensuring the effectiveness of electrostatic protection during screen testing and improving equipment safety and test stability.

[0031] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A liquid crystal screen dot test clamping device, comprising a base (1); Its features are, It also includes a workbench (2), a pad (3), a power supply module (31), a slide rail (4), a slide block (41), an electric cylinder (42), a slide rail (5), a slide table (51), an electric cylinder (52), a pneumatic damper (53), an L-shaped bracket (54), and rollers (55). The workbench (2) is mounted on the base (1), and the pad (3) is laid on the workbench (2). The power supply module (31) is mounted on one side of the pad (3). The power supply module (31) is used to power the components to be tested. The LCD screen is powered by two parallel slide rails (4) on the front and back sides of the upper part of the base (1). Each slide rail (4) has a slider. The top of each slider on the front and back slide rails (4) is fixedly connected to a slide block (41). The two slide blocks (41) are arranged symmetrically front and back. Each upper left and right side of the base (1) has an electric cylinder (42). The drive rod of each electric cylinder (42) is connected to a slide block (41). The electric cylinder (42) drives the slide block (41) through the electric cylinder (42). When the slide (41) moves back and forth, it does not interfere with the worktable (2) and the pad (3). There are slide rails (5) on both the left and right sides of the top of the slide (41). Each slide rail (5) has a slider. Each slider of the slide rail (5) has a slide table (51). Each slide (41) has two electric cylinders (52). The drive rod of each electric cylinder (52) is connected to a slide table (51). The electric cylinder (52) drives the slide table (51) to move left and right on the slide (41). Pneumatic dampers (53) are installed on the slide table (51). L-shaped brackets (54)(43) are connected to the support rods of the pneumatic dampers (53). Rollers (55) are rotatably connected to the two arms of the L-shaped brackets (54). The outer circumference of the rollers (55) is provided with an elastic buffer layer. The bottom height of the rollers (55) is the same as the top height of the pad (3). Through the rollers (55) on the four L-shaped brackets (54), a rectangular feeding area is formed above the pad (3).

2. The LCD screen dot-mapping test clamping device as described in claim 1, characterized in that, It also includes a support frame (43) and a vision instrument (44). The support frame (43) is fixedly mounted on the base (1). The vision instrument (44) is rotated on the upper part of the support frame (43). The vision end of the vision instrument (44) faces the pad (3). Data processing modules are provided on both L-shaped brackets (54) and (43). Pressure sensors are provided in the rotation axis of the rollers (55). The pressure sensors are all connected to the data processing modules on the same L-shaped brackets (54) and (43).

3. The LCD screen dot-mapping test clamping device as described in claim 2, characterized in that, It also includes a cylinder (7) and a rotating seat (71). The cylinder (7) is vertically installed in the lower part of the worktable (2) of the support (72). The upper end of the movable rod of the cylinder (7) is fixedly connected to the rotating seat (71). The rotating seat (71) is equipped with a motor. A circular groove is opened in the pad (3). The support (72) is rotatably embedded in the circular groove. The output shaft of the motor is connected to the bottom of the support (72).

4. The LCD screen dot-mapping test clamping device as described in claim 3, characterized in that, It also includes an air supply module (8) and an air pipe (81). The interior of the support platform (72) is hollow. There are several air ports (810) on one side of the top of the support platform (72). The lower part of the workbench (2) is equipped with an air supply module (8). The air supply module (8) is connected to the interior space of the support platform (72) through the air pipe (81).

5. The LCD screen dot-mapping test clamping device as described in claim 4, characterized in that, It also includes a conductive connector (6), and a silicone layer is provided on the upper surface of the pad (3) and the support (72). A conductive layer is sprayed on the upper surface of the silicone layer. The pad (3) is provided with a conductive connector (6), which is used to connect the grounding wire.

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