Bending force testing equipment suitable for liquid crystal display screen

Abstract

The invention relates to the technical field of bending force testing, in particular to bending force testing equipment suitable for a liquid crystal display screen, and the bending force testing equipment comprises a working frame, and further comprises a first cylinder fixed at the top of the inner wall of the working frame through a mounting box; the first extrusion block is fixed at the end part of a telescopic rod of the first cylinder; the two second extrusion blocks are symmetrically mounted at the bottom of the inner wall of the working frame; the pushing assembly is mounted in the working frame and used for supporting the two ends of the display screen when the display screen is extruded by the first extrusion block to be bent, so that the display screen is prevented from deviating and being separated; the first pressure sensor is fixed to the bottom of the first extrusion block and used for detecting extrusion pressure; according to the device, through the arrangement of the pushing assembly, in the extrusion bending process of the display screen, the moving distance of the two ends is limited, and therefore the situation that the display screen deviates towards one side in the bending process and is disengaged is avoided.

Description

Technical Field

[0001] The present invention relates to the field of bending force testing, and particularly to a bending force testing device suitable for liquid crystal display screens. Background Art

[0002] The bending degree test of a liquid crystal display screen refers to generating bending deformation of the liquid crystal display screen by applying a bending force under specific test conditions, and measuring the deformation degree and the force borne during the bending process to evaluate the bending resistance performance, reliability, and durability of the liquid crystal display screen.

[0003] When performing a bending force test on a display screen, if the display screen is offset during the test, it will lead to inaccurate bending force test of the display screen, thus affecting the test results. Moreover, applying pressure only to the middle of the display screen will also make the stress points of the display screen single, resulting in differences in the test results. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose a bending force testing device suitable for liquid crystal display screens.

[0005] The present invention provides a bending force testing device suitable for liquid crystal display screens, including a working frame, and further including:

[0006] A first cylinder, fixed to the top of the inner wall of the working frame through a mounting box;

[0007] A first extrusion block, fixed to the end of the telescopic rod of the first cylinder;

[0008] Two second extrusion blocks, symmetrically installed at the bottom of the inner wall of the working frame;

[0009] A pushing component, installed inside the working frame, used to support both ends of the display screen when the first extrusion block squeezes the display screen to cause bending, so as to prevent the display screen from offsetting and detaching;

[0010] A first pressure sensor, fixed to the bottom of the first extrusion block, used to detect the extrusion pressure;

[0011] Place the display screen to be tested on the two second extrusion blocks, so that the two second extrusion blocks support the display screen. At the same time, the pushing component fits both ends of the display screen, so that the pushing component limits both ends of the display screen. Thus, during the extrusion and bending process of the display screen, the moving distance of both ends is limited, which is conducive to preventing the display screen from offsetting to one side and detaching during the bending process.

[0012] After the first cylinder is started, it pushes the first extrusion block downward through the telescopic rod. After the first extrusion block moves downward, it extrudes the middle part of the display screen, thereby pushing the middle part of the display screen downward, causing the display screen to bend under the extrusion of the first extrusion block and the second extrusion block, so as to detect the bending force of the display screen.

[0013] The first pressure sensor can detect the pressure exerted by the first extrusion block. When the display screen bends and breaks, the pressure detected by the first pressure sensor is the ultimate pressure that the display screen can withstand, and the bending degree of the display screen at this time is recorded.

[0014] Preferably, the pushing assembly includes:

[0015] Two moving frames are symmetrically and slidably installed inside the working frame;

[0016] Two groups of second cylinders are respectively symmetrically fixed on the two outer side walls of the working frame through support plates, and the two second cylinders are symmetrically arranged in a group;

[0017] After the second cylinder is started, it can push the moving frame to move through the telescopic rod. When the display screen bends, the ends of the display screen will tilt upward. At this time, the ends of the display screen are separated from the moving frame. At this time, the second cylinder pushes the moving frame towards the display screen to maintain the position where the moving frame is connected to the ends of the display screen, and the moving frames at both ends move the same distance, so that the two ends of the display screen are symmetrical, which is beneficial to support the ends of the display screen and avoid the situation that the display screen deviates to one side during the bending detection, resulting in the display screen falling off and affecting the detection result.

[0018] Preferably, the pushing assembly further includes:

[0019] Two lifting platforms are respectively slidably installed in the second chutes inside the two moving frames;

[0020] Two groups of rotating columns are respectively rotatably installed on the opposite sides of the two lifting platforms;

[0021] Two groups of sliding blocks are respectively fixed on the opposite sides of the two groups of rotating columns;

[0022] Two clamping blocks are respectively clamped and fixed on the two side edges of the display screen;

[0023] Two groups of first chutes are respectively opened on the outer walls of the two clamping blocks, and the two groups of sliding blocks are respectively slidably installed inside the two groups of first chutes;

[0024] When the end of the display screen bends and moves upward, it drives the clamping block to move upward synchronously. The clamping block drives the first sliding groove to move synchronously. After the first sliding groove moves, the sliding block slides inside the first sliding groove, and the sliding block moves upward along with the first sliding groove. The sliding block drives the rotating column to move upward, thereby pushing the lifting platform upward. The lifting platform slides inside the second sliding groove, so as to maintain the connection between the moving frame and the end of the display screen, so that the position of the end of the display screen is restricted by the moving frame, which is conducive to avoiding the situation that the display screen deviates during the bending detection process.

[0025] Preferably, the pushing assembly further includes:

[0026] Two buffer pads, which are respectively fixed on the inner walls of the two clamping blocks;

[0027] The buffer pads arranged inside the clamping blocks isolate the clamping force of the clamping blocks on the display screen, which is conducive to avoiding the hard clamping blocks directly acting on the display screen. When the display screen bends, the contact point between the display screen and the clamping blocks generates a hard extrusion, resulting in the situation of the edge of the display screen being broken, which is conducive to avoiding the situation that the detection result is affected due to the breakage of the display screen.

[0028] Preferably, the pushing assembly further includes:

[0029] Two second pressure sensors, which are respectively fixed on the opposite sides of the two lifting platforms;

[0030] The second pressure sensor can detect the extrusion force between the side of the lifting platform facing the second cylinder and the inner wall of the second sliding groove. When the extrusion force is detected, it means that the pushing distance of the moving frame is too much. At this time, stop pushing the moving frame, and pull the moving frame back according to the pressure value.

[0031] Preferably, the pushing assembly further includes:

[0032] Two groups of third pressure sensors. Two of the third pressure sensors are in a group. The two third pressure sensors in the same group are symmetrically fixed on the side of the lifting platform facing the middle of the working frame respectively;

[0033] The third pressure sensor can detect the extrusion force between the side of the lifting platform facing the middle of the working frame and the inner wall of the second sliding groove. When the extrusion force is detected, it means that the pushing distance of the moving frame is too short. At this time, start pushing the moving frame, and adjust the pushing distance of the moving frame according to the pressure value.

[0034] Preferably, the pushing assembly further includes:

[0035] Two support platforms, which are respectively rotatably installed inside the mounting frames fixed on the side walls of the two moving frames;

[0036] Two groups of push rods, two of which form a group, and the two push rods in the same group are symmetrically fixed at two ends of the support platform;

[0037] Two third cylinders are respectively fixed on the tops of the two mounting frames;

[0038] Two pushing blocks are respectively fixed to the ends of the telescopic rods of the two third cylinders, and the bottoms of the pushing blocks are both provided with inclined surfaces;

[0039] A clearance opening is provided through the side wall of the movable frame and is used to make way for the flipping of the support platform;

[0040] When the lifting platform moves to the rearmost part of the second slide slot, the third cylinder is started. After the third cylinder is started, the push block is pushed downward by the telescopic rod. After the push block moves downward, the push rod is pushed by the inclined surface, so that the push rod is pushed to one side, and the push rod is fixed to the support platform, thereby pushing the support platform to rotate. Then the push block continues to move downward to push the push rod downward, thereby squeezing and pushing the support platform to rotate. After the support platform rotates, the two planes are in a horizontal state, and the bottom of the lifting platform is supported by the plane in a horizontal state, which is conducive to supporting and limiting the lifting platform moved to the top. At this time, the second cylinder is started to push the moving frame, and the display screen is continued to be squeezed by the moving frames on both sides. At the same time, the first cylinder is started to drive the first squeezing block to reset. At this time, the display screen that has been initially bent is clamped by the two moving frames to continue the bending force test, which is conducive to avoiding the situation that the display screen is directly clamped and squeezed by the two ends when it is straight, resulting in unstable force and direct damage to the display screen, and it is conducive to the squeezing and clamping at both ends so that the force on the middle part of the display screen is uniform when it is bent, which is conducive to improving the accuracy of the bending force test of the display screen. At this time, the second pressure sensor can detect the applied squeezing force.

[0041] Preferably, the pushing assembly further comprises:

[0042] Two bases are respectively inserted vertically and slidably at the bottom of the two second extrusion blocks;

[0043] Two fourth cylinders, respectively fixed inside the two bases, for adjusting the vertical position of the second extrusion block;

[0044] After the fourth cylinder is started, it drives the base to move vertically, so that when the two mobile frames clamp the display screen for bending detection, the base can be driven to move downward to make way, which helps to avoid the base interfering with the bending of the display screen at the bottom, resulting in inaccurate detection results.

[0045] Preferably, the pushing assembly further comprises:

[0046] Two first magnets, respectively fixed to the bottoms of the two second chutes;

[0047] Two second magnets, respectively fixed to the bottoms of the two lifting platforms;

[0048] The like poles of the second magnets and the first magnets repel each other. In the initial position, the magnetic repulsive force of the second magnets on the first magnets balances the gravity of the lifting platforms and their internal components and the friction between the lifting platforms and the interiors of the second chutes, so that the lifting platforms in the initial state are in a state of balanced force. And at this time, the lifting platforms will move when a very small upward driving force is applied, thus facilitating the upward pushing of the lifting platforms. At this time, when the display screen bends upward at the end, it can push the lifting platform upward with a very small force, which is beneficial to reducing the interference caused by the friction between the lifting platform and the second chute to the detection of the display screen when the lifting platform is pushed upward.

[0049] Preferably, the pushing assembly further includes:

[0050] Two groups of fifth cylinders, with two of the fifth cylinders as a group. The fifth cylinders in the same group are symmetrically fixed to both ends of the moving frame;

[0051] Two groups of connecting blocks, with two of the connecting blocks as a group. The connecting blocks in the same group are symmetrically fixed to both ends of the first magnet. The fifth cylinders drive the connecting blocks to move vertically through the telescopic rods respectively;

[0052] Two groups of relief grooves, with two of the relief grooves as a group. The relief grooves are symmetrically formed through the side walls at both ends of the moving frame;

[0053] When the end of the display screen bends upward, the end of the display screen drives the lifting platform to move upward. At this time, the fifth cylinders are controlled to start. The fifth cylinders drive the connecting blocks to move upward, and the connecting blocks drive the first magnets to move upward, so that the distance between the first magnets and the second magnets is constant, thus maintaining the balanced force state applied to the lifting platform.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] Through the arrangement of the pushing assembly, the moving distances at both ends of the display screen are limited during the extrusion and bending process, which is beneficial to avoiding the situation that the display screen deviates to one side and detaches during the bending process. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0057] Figure 2 is a schematic diagram of the overall structure after sectioning of the present invention Figure 1

[0058] ​Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0059] Figure 4 The structure of the present invention after full section is schematically shown Figure 2 .

[0060] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0061] Figure 6 The structure of the present invention after the overall section is schematically shown. Figure 3 .

[0062] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at point C in the middle.

[0063] In the figure: 1, working frame; 101, installation box; 102, first cylinder; 103, first extrusion block; 104, second extrusion block; 2, moving frame; 201, second cylinder; 202, support plate; 3, lifting platform; 301, rotating column; 302, sliding block; 303, clamping block; 304, first slide groove; 305, second slide groove; 4, buffer pad; 501, first pressure sensor; 502, second pressure sensor; 6, support platform; 601, installation frame; 602, push rod; 603, push block; 604, inclined plane; 605, third cylinder; 606, make way opening; 7, base; 701, fourth cylinder; 8, first magnet; 801, second magnet; 9, fifth cylinder; 901, connecting block; 902, make way groove. DETAILED DESCRIPTION

[0064] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0065] like Figures 1 to 7 The bending force testing device for a liquid crystal display screen shown includes a working frame 1 and further includes:

[0066] The first cylinder 102 is fixed to the top of the inner wall of the work frame 1 through the mounting box 101;

[0067] A first extrusion block 103 is fixed to the end of the telescopic rod of the first cylinder 102;

[0068] Two second extrusion blocks 104 are symmetrically mounted on the bottom of the inner wall of the working frame 1;

[0069] The pushing component is installed inside the working frame 1 and is used to support both ends of the display screen when the first pressing block 103 presses the display screen to cause bending, so as to prevent the display screen from shifting and detaching;

[0070] The first pressure sensor 501 is fixed to the bottom of the first pressing block 103 and is used to detect the pressing pressure;

[0071] When performing a bending force test on the display screen, if the display screen shifts during the test, it will cause the bending force test of the display screen to be inaccurate, thus affecting the test result. Moreover, applying pressure only to the middle of the display screen will also make the stress point of the display screen single, resulting in differences in the test results;

[0072] This embodiment of the present invention can solve the above problems. The specific implementation method is as follows: Place the display screen to be detected on the two second pressing blocks 104, so that the two second pressing blocks 104 support the display screen. At the same time, the pushing component fits the two ends of the display screen, so that the pushing component limits the two ends of the display screen. Thus, during the process of pressing and bending the display screen, the moving distance of the two ends is limited, which is conducive to preventing the display screen from shifting to one side and detaching during the bending process;

[0073] After the first cylinder 102 is started, it pushes the first pressing block 103 to move downward through the telescopic rod. After the first pressing block 103 moves downward, it presses the middle part of the display screen, thereby pushing the middle part of the display screen to move downward, so that the display screen bends under the pressing action of the first pressing block 103 and the second pressing block 104, thereby detecting the bending force of the display screen;

[0074] The first pressure sensor 501 can detect the pressure applied by the first pressing block 103. When the display screen bends and breaks, the pressure detected by the first pressure sensor 501 is the limit pressure that the display screen can withstand, and the bending degree of the display screen at this time is recorded.

[0075] As an optional embodiment, the pushing component includes:

[0076] Two moving frames 2 are symmetrically and slidably installed inside the working frame 1;

[0077] Two groups of second cylinders 201 are respectively symmetrically fixed to the two outer side walls of the working frame 1 through support plates 202, and two second cylinders 201 are symmetrically arranged as a group;

[0078] After the second cylinder 201 is started, it can push the moving frame 2 through the telescopic rod. When the display screen bends, the end of the display screen will tilt upward. At this time, the end of the display screen is separated from the moving frame 2. At this time, the second cylinder 201 pushes the moving frame 2 towards the display screen, maintaining the position where the moving frame 2 is connected to the end of the display screen, and the two moving frames 2 at both ends move the same distance, so that the two ends of the display screen are symmetrical, which is beneficial to support the end of the display screen and avoid the situation that the display screen deviates to one side during the bending test, resulting in the display screen falling off and affecting the test results.

[0079] As an alternative embodiment, the pushing assembly further includes:

[0080] Two lifting platforms 3, respectively slidably installed in the second sliding grooves 305 inside the two moving frames 2;

[0081] Two groups of rotating columns 301, respectively rotatably installed on the opposite sides of the two lifting platforms 3;

[0082] Two groups of sliding blocks 302, respectively fixed on the opposite sides of the two groups of rotating columns 301;

[0083] Two clamping blocks 303, respectively clamping and fixing the two side edges of the display screen;

[0084] Two groups of first sliding grooves 304, respectively opened on the outer walls of the two clamping blocks 303, and the two groups of sliding blocks 302 are respectively slidably installed inside the two groups of first sliding grooves 304;

[0085] When the end of the display screen bends and moves upward, it drives the clamping block 303 to move upward synchronously. The clamping block 303 drives the first sliding groove 304 to move synchronously. After the first sliding groove 304 moves, the sliding block 302 slides inside the first sliding groove 304, and the sliding block 302 moves upward with the first sliding groove 304. The sliding block 302 drives the rotating column 301 to move upward, thereby pushing the lifting platform 3 to move upward. The lifting platform 3 slides inside the second sliding groove 305, so as to maintain the connection between the moving frame 2 and the end of the display screen, so that the position of the end of the display screen is restricted by the moving frame 2, which is beneficial to avoid the situation that the display screen deviates during the bending test.

[0086] As an alternative embodiment, the pushing assembly further includes:

[0087] Two buffer pads 4, respectively fixed on the inner walls of the two clamping blocks 303;

[0088] The buffer pad 4 arranged inside the clamping block 303 isolates the clamping force of the clamping block 303 on the display screen, which helps to avoid the hard clamping block 303 directly exerting force on the display screen. When the display screen is bent, the force point between the display screen and the clamping block 303 is hard squeezed, causing the edge of the display screen to break, which helps to avoid the display screen being broken and affecting the detection result.

[0089] As an optional embodiment, the pushing component further includes:

[0090] Two second pressure sensors 502 are respectively fixed on opposite sides of the two lifting platforms 3;

[0091] The second pressure sensor 502 can detect the squeezing pressure between the side of the lifting platform 3 facing the second cylinder 201 and the inner wall of the second slide groove 305. When the squeezing pressure is detected, it means that the moving frame 2 is pushed too far. At this time, the pushing of the moving frame 2 is stopped, and the moving frame 2 is pulled back according to the pressure value.

[0092] As an optional embodiment, the pushing component further includes:

[0093] Two groups of third pressure sensors, two third pressure sensors form a group, and the two third pressure sensors in the same group are symmetrically fixed on one side of the lifting platform 3 facing the middle of the working frame 1;

[0094] The third pressure sensor can detect the squeezing pressure between the side of the lifting platform 3 facing the middle of the working frame 1 and the inner wall of the second slide groove 305. When the squeezing pressure is detected, it means that the pushing distance of the mobile frame 2 is too short. At this time, the pushing of the mobile frame 2 is started, and the pushing distance of the mobile frame 2 is adjusted according to the pressure value.

[0095] As an optional embodiment, the pushing component further includes:

[0096] Two support platforms 6 are rotatably mounted inside mounting frames 601 fixed to the side walls of the two mobile racks 2;

[0097] Two groups of push rods 602, two push rods 602 form a group, and the two push rods 602 in the same group are symmetrically fixed at two ends of the support platform 6;

[0098] Two third cylinders 605 are respectively fixed on the top of the two mounting frames 601;

[0099] Two push blocks 603 are respectively fixed to the ends of the telescopic rods of the two third cylinders 605, and the bottoms of the push blocks 603 are both provided with inclined surfaces 604;

[0100] The clearance opening 606 is formed through the side wall of the movable frame 2 and is used to make way for the flipping of the support platform 6;

[0101] When the lifting platform 3 moves to the rearmost part of the second sliding groove 305, the third air cylinder 605 is activated. After the third air cylinder 605 is activated, the push block 603 is pushed downward by the telescopic rod. After the push block 603 moves downward, the push rod 602 is pushed by the inclined surface 604, so that the push rod 602 moves to one side after being pushed. The push rod 602 is fixed to the support platform 6, thereby pushing the support platform 6 to rotate. Subsequently, the push block 603 continues to move downward to push the push rod 602 downward, thereby squeezing and pushing the support platform 6 to rotate. After the support platform 6 rotates, the two planes are in a horizontal state, and the bottom of the lifting platform 3 is supported by the horizontal plane, which is beneficial to supporting and limiting the lifting platform 3 that has moved to the topmost position. At this time, the second air cylinder 201 is activated to push the moving frame 2, and the display screen is continuously squeezed by the two moving frames 2 on both sides. At the same time, the first air cylinder 102 is activated to drive the first extrusion block 103 to reset. At this time, the display screen that has been initially bent is clamped by the two moving frames 2 to continue the bending force test, which is beneficial to avoiding the situation that when the display screen is straight, it is directly clamped and squeezed at both ends, resulting in unstable force on the display screen and direct damage. And it is beneficial to make the force in the middle of the display screen uniform when the display screen is bent through the extrusion and clamping at both ends, which is beneficial to improving the accuracy of the bending force test of the display screen. At this time, the second pressure sensor 502 can detect the applied extrusion force.

[0102] As an optional embodiment, the pushing assembly further includes:

[0103] Two bases 7, which are respectively vertically slidably inserted into the bottoms of the two second extrusion blocks 104;

[0104] Two fourth air cylinders 701, which are respectively fixed inside the two bases 7 and are used to adjust the vertical position of the second extrusion block 104;

[0105] After the fourth air cylinder 701 is activated, it drives the base 7 to move vertically. Thus, when the two moving frames 2 clamp and bend the display screen for detection, it can drive the base 7 to move downward to make way, which is beneficial to avoiding the situation that the base 7 interferes with the bending of the display screen at the bottom and causes inaccurate detection results.

[0106] As an optional embodiment, the pushing assembly further includes:

[0107] Two first magnets 8, which are respectively fixed to the bottoms of the two second sliding grooves 305;

[0108] Two second magnets 801, which are respectively fixed to the bottoms of the two lifting platforms 3;

[0109] The second magnet 801 repels the first magnet 8 with the same magnetic poles. At the initial position, the magnetic repulsive force of the second magnet 801 on the first magnet 8 balances the gravity of the lifting platform 3 and its internal components, as well as the frictional force between the lifting platform 3 and the second sliding groove 305, so that the lifting platform 3 in the initial state is in a state of balanced force. And at this time, the lifting platform 3 will move when it receives a very small upward driving force, which is convenient for pushing the lifting platform 3 upward. At this time, when the end of the display screen bends upward, it can push the lifting platform 3 upward with a very small force, which is beneficial to reducing the interference caused by the frictional force between the lifting platform 3 and the second sliding groove 305 to the detection of the display screen when the lifting platform 3 is pushed upward.

[0110] As an alternative embodiment, the pushing assembly further includes:

[0111] Two groups of fifth cylinders 9, with two fifth cylinders 9 in a group, and the fifth cylinders 9 in the same group are symmetrically fixed at both ends of the moving frame 2;

[0112] Two groups of connecting blocks 901, with two connecting blocks 901 in a group, and the connecting blocks 901 in the same group are symmetrically fixed at both ends of the first magnet 8. The fifth cylinders 9 drive the connecting blocks 901 to move vertically through the telescopic rods respectively;

[0113] Two groups of relief grooves 902, with two relief grooves 902 in a group, are symmetrically formed through the side walls at both ends of the moving frame 2;

[0114] When the end of the display screen bends upward, the end of the display screen drives the lifting platform 3 to move upward. At this time, the fifth cylinder 9 is controlled to start, and the fifth cylinder 9 drives the connecting block 901 to move upward. The connecting block 901 drives the first magnet 8 to move upward, so that the distance between the first magnet 8 and the second magnet 801 is constant, thereby maintaining the balanced force state applied to the lifting platform 3.

[0115] The working principle of the present invention: Place the display screen to be detected on the two second pressing blocks 104, so that the two second pressing blocks 104 support the display screen. At the same time, the pushing assembly fits the two ends of the display screen, so that the pushing assembly limits the two ends of the display screen, so that during the process of squeezing and bending the display screen, the moving distances of the two ends are limited, which is beneficial to avoiding the situation that the display screen deviates to one side and detaches during the bending process;

[0116] After the first cylinder 102 is started, it pushes the first pressing block 103 downward through the telescopic rod. After the first pressing block 103 moves downward, it squeezes the middle part of the display screen, thereby pushing the middle part of the display screen downward, so that the display screen bends under the squeezing action of the first pressing block 103 and the second pressing block 104, so as to detect the bending force of the display screen;

[0117] The first pressure sensor 501 can detect the pressure exerted by the first extrusion block 103. When the display screen is bent and broken, the pressure detected by the first pressure sensor 501 is the ultimate pressure that the display screen can withstand, and the degree of bending of the display screen at this time is recorded.

[0118] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A bending force testing device for a liquid crystal display screen, comprising a working frame (1), characterized in that: Also includes: A first cylinder (102) is fixed to the top of the inner wall of the working frame (1) through a mounting box (101); A first extrusion block (103) fixed to the end of the telescopic rod of the first cylinder (102); Two second extrusion blocks (104) are symmetrically mounted on the bottom of the inner wall of the working frame (1); A pushing assembly is installed inside the working frame (1) and is used to support both ends of the display screen when the first extrusion block (103) extrudes the display screen to bend it, so as to prevent the display screen from deviating and coming off; The first pressure sensor (501) is fixed to the bottom of the first extrusion block (103) and is used to detect the extrusion pressure.

2. The bending force testing device for liquid crystal display screens according to claim 1, characterized in that: The pushing component comprises: Two movable racks (2) are symmetrically slidably mounted inside the working rack (1); Two groups of second cylinders (201) are symmetrically fixed to two outer side walls of the working frame (1) through support plates (202), and two of the second cylinders (201) are symmetrically arranged as a group.

3. The bending force testing device for liquid crystal display screens according to claim 2, characterized in that: The push assembly also includes: Two lifting platforms (3) are respectively slidably mounted on the second slide grooves (305) inside the two moving frames (2); Two groups of rotating columns (301) are rotatably mounted on opposite sides of the two lifting platforms (3); Two sets of sliding blocks (302) are respectively fixed on opposite sides of the two sets of rotating columns (301); Two clamping blocks (303) are respectively clamped and fixed on the two side edges of the display screen; The two groups of first sliding grooves (304) are respectively opened on the outer walls of the two clamping blocks (303), and the two groups of sliding blocks (302) are respectively slidably installed inside the two groups of first sliding grooves (304).

4. The bending force testing device for liquid crystal display screens according to claim 3, characterized in that: The push assembly also includes: The two buffer pads (4) are respectively fixed on the inner walls of the two clamping blocks (303).

5. The bending force testing device for liquid crystal display screens according to claim 3, characterized in that: The push assembly also includes: The two second pressure sensors (502) are respectively fixed on opposite sides of the two lifting platforms (3).

6. The bending force testing device for liquid crystal display screens according to claim 5, characterized in that: The push assembly also includes: Two groups of third pressure sensors, two of the third pressure sensors form a group, and the two third pressure sensors in the same group are symmetrically fixed on one side of the lifting platform (3) facing the middle of the working frame (1).

7. The bending force testing device for liquid crystal display screens according to claim 3, characterized in that: The push assembly also includes: Two support platforms (6) are rotatably mounted inside mounting frames (601) fixed to the side walls of the two movable frames (2); Two groups of push rods (602), two of the push rods (602) form a group, and the two push rods (602) in the same group are symmetrically fixed at two ends of the support platform (6); Two third cylinders (605) are respectively fixed on the tops of the two installation frames (601); Two pushing blocks (603) are respectively fixed to the ends of the telescopic rods of the two third cylinders (605), and the bottoms of the pushing blocks (603) are both provided with inclined surfaces (604); A clearance opening (606) is provided through the side wall of the movable frame (2) and is used to make way for the flipping of the support platform (6).

8. The bending force testing device for liquid crystal display screens according to claim 7, characterized in that: The push assembly also includes: Two bases (7) are respectively inserted vertically and slidably at the bottoms of the two second extrusion blocks (104); Two fourth cylinders (701) are respectively fixed inside the two bases (7) and are used to adjust the vertical position of the second extrusion block (104).

9. The bending force testing device for liquid crystal display screens according to claim 7, characterized in that: The push assembly also includes: Two first magnets (8) are respectively fixed to the bottom of the two second slide grooves (305); The two second magnets (801) are respectively fixed to the bottom of the two lifting platforms (3).

10. The bending force testing device for liquid crystal display screens according to claim 9, characterized in that: The push assembly also includes: Two groups of fifth cylinders (9), two of the fifth cylinders (9) form a group, and the fifth cylinders (9) in the same group are symmetrically fixed at two ends of the moving frame (2); Two groups of connection blocks (901), two of the connection blocks (901) form one group, the connection blocks (901) in the same group are symmetrically fixed at two ends of the first magnet (8), and the fifth cylinder (9) drives the connection blocks (901) to move vertically through the telescopic rods; Two groups of clearance grooves (902), two of which form a group, are symmetrically arranged on the side walls at both ends of the movable frame (2).

Images