Capacitive touch screen compression resistance testing device and testing method

Abstract

The invention relates to the technical field of touch screen production and research and development, in particular to a capacitive touch screen compression resistance testing device and a capacitive touch screen compression resistance testing method. A capacitive touch screen compression resistance testing device comprises a detection platform, an electric conveyor belt and the like. An electric conveyor belt for conveying the touch screen is mounted on the detection platform; and a camera is mounted on the detection platform. The touch screen testing device is suitable for assembly line workshops and laboratory environments, the universality of the testing device is improved, the testing cost is reduced, when the touch screen testing device is used for testing in a laboratory, the use state of the touch screen in high-temperature, low-temperature and surface icing environments can be simulated, the testing conditions can be perfected, and more testing data can be obtained; the closed space is formed among the gas guide plate, the touch screen, the fixing plate, the first limiting plate, the second limiting plate, the mounting plate and the top plate, high-temperature or low-temperature gas is prevented from being diffused to the outside, heat loss is reduced, the temperature control efficiency is improved, energy loss is reduced, and the test cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screen production and research and development, and particularly relates to a device and method for testing the compressive performance of a capacitive touch screen. Background Art

[0002] A touch screen compressive test device (hereinafter referred to as the test device) is commonly used in an assembly line workshop. Its purpose is to batch test the compressive performance of finished touch screens to ensure that the touch screens leaving the factory meet the basic compressive standards. However, the assembly line requires high detection efficiency to ensure production continuity. In the existing technology, the touch screen test process usually requires manual placement of the touch screen on a fixed platform for testing. After the test is completed, the touch screen is removed from the fixed platform, and then the next touch screen is detected. Therefore, during the test, manual placement and removal of the touch screen are required, resulting in low test efficiency. Moreover, during the test process, if the compressive strength of the touch screen is unqualified and the touch screen is broken, it is necessary to suspend the test to clean up the splashed glass fragments, which further affects the test efficiency.

[0003] In summary, the present application proposes a device and method for testing the compressive performance of a capacitive touch screen to improve the above-mentioned technical problems. Summary of the Invention

[0004] In order to overcome the disadvantages of the existing touch screen compressive test device relying on manual loading and unloading, resulting in low efficiency, and the cleaning of glass fragments affecting production continuity, the present invention provides a device and method for testing the compressive performance of a capacitive touch screen.

[0005] Technical solution: A capacitance touch screen compressive performance testing device includes a detection platform and an electric conveyor belt; an electric conveyor belt for conveying the touch screen is installed on the detection platform; a camera is installed on the detection platform; it also includes a three-axis moving frame, a gas guide plate, a pressing rod, a driving component, a fixing component and a sealing component; a three-axis moving frame is installed on the detection platform; the gas guide plate is connected to the three-axis moving frame; the gas guide plate is driven by the three-axis moving frame to move up and down, forward and backward, and left and right; an infrared alignment sensor is installed on the detection platform; the infrared alignment sensor is aligned with the gas guide plate in the front-rear direction; a cavity is provided inside the gas guide plate, which is communicated with an external air conditioning device through a pipeline; an air pump, a refrigeration unit and a heating unit are arranged in the external air conditioning device, which has the functions of pumping air, supplying air and adjusting the temperature of the gas; a plurality of air guide holes are opened on the lower side of the gas guide plate; the air guide holes are communicated with the cavity inside the gas guide plate; a driving component is installed on the three-axis moving frame; a plurality of pressing rods are connected to the driving component; the pressing rods are driven by the driving component to move up and down and rotate; all the pressing rods surround the outside of the gas guide plate; a fixing component for fixing the touch screen is installed on the detection platform; a plurality of through grooves for cleaning glass debris are opened on the fixing component; a sealing component for reducing the test energy consumption is installed on the detection platform; a cover plate for covering the through grooves is connected to the sealing component in a lifting manner.

[0006] More preferably, the fixing component includes a fixing frame, a first driving member, a fixing plate, a first limiting plate and a second limiting plate; the fixing frame is fixedly connected to the detection platform; the fixing frame is located above the electric conveyor belt; four first driving members are fixedly connected to the fixing frame; a fixing plate is fixedly connected to the telescopic end of each first driving member; the four fixing plates are distributed in a rectangle; a through groove for cleaning glass debris is opened on each fixing plate, and each through groove is communicated with the external air conditioning device through a pipeline; a first limiting plate for fixing and supporting the touch screen is installed on the front and rear fixing plates respectively; the cross section of the first limiting plate is L-shaped; a second limiting plate is installed on the left and right fixing plates respectively.

[0007] More preferably, the upper surface of each fixing plate is set higher than the upper surface of the first limiting plate and the upper surface of the second limiting plate.

[0008] More preferably, the surfaces of the first limiting plate and the second limiting plate are covered with a rubber layer.

[0009] More preferably, each through groove can also be communicated with an external water pump through a pipeline.

[0010] More preferably, the driving assembly includes a swivel ring, a direct drive motor, and a second driving member; the swivel ring is rotatably connected to the air guide plate; several first electromagnets arranged in a ring are fixedly connected to the swivel ring; the first electromagnets are in an annular shape; each first electromagnet is in sliding contact with the adjacent extrusion rod; the extrusion rod is made of a magnetic material; the direct drive motor is fixedly connected to the three-axis moving frame; the output end of the direct drive motor is fixedly connected to the swivel ring; the second driving member is fixedly connected to the three-axis moving frame; a second electromagnet is fixedly connected to the telescopic end of the second driving member; the second electromagnet is sleeved on the adjacent extrusion rod.

[0011] More preferably, a pressing head is screwed to the lower end of each extrusion rod, and different materials can be selected for each pressing head.

[0012] More preferably, the sealing assembly includes a third driving member, a mounting plate, a fourth driving member, a baffle, a fifth driving member, and a top plate; the third driving member is fixedly connected to the detection platform; the mounting plate is fixedly connected to the telescopic end of the third driving member; the mounting plate is driven to move back and forth by the third driving member; several fourth driving members arranged in a rectangle are fixedly connected to the mounting plate; several baffles arranged in a rectangle for covering the through groove are slidably connected to the inner side of the mounting plate; a rubber layer is wrapped around the lower side of the front baffle; each baffle is fixedly connected to the telescopic end of the adjacent fourth driving member; the baffle is driven to move up and down by the fourth driving member; the fifth driving member is fixedly connected to the detection platform; the top plate is slidably connected to the upper side of the mounting plate; the telescopic end of the fifth driving member is fixedly connected to the top plate; a through hole is opened at the center of the top plate.

[0013] More preferably, both the first limiting plate and the second limiting plate are arranged to be fixedly connected to the corresponding fixing plate by bolts.

[0014] A method for testing the compressive performance of a capacitive touch screen includes the following working steps: S1: Loading, placing the touch screen on the electric conveyor belt through an external transfer device, and then transmitting the touch screen through the electric conveyor belt. S2: Fixing, adsorbing the touch screen through the air guide plate, and clamping and fixing the touch screen through the fixing assembly. S3: Testing, squeezing and testing the touch screen through the extrusion rod, which can simulate the use state of the touch screen in high temperature, low temperature and surface icing environments, improve the test conditions and obtain more test data. S4: Checking the result, observing whether the touch screen is damaged through the camera on the detection platform.

[0015] Beneficial effects: This testing device is applicable to the pipeline workshop and laboratory environments, which not only improves the versatility of the testing device but also reduces the testing cost. And when used for laboratory testing, it can simulate the use state of the touch screen in high temperature, low temperature and surface icing environments, improve the test conditions and obtain more test data. A closed space is formed among the air guide plate, the touch screen, the fixing plate, the first limiting plate, the second limiting plate, the mounting plate and the top plate, which blocks the diffusion of high-temperature or low-temperature gas to the outside, reduces heat loss, improves the temperature control efficiency, and enables the high-temperature air flow or low-temperature air flow to circulate, improving the utilization rate of thermal energy, thereby reducing energy consumption and lowering the test cost. The ice layer surface is continuously scraped by the extrusion head, breaking the ice layer into small ice cubes, which can reduce the time required for the ice layer to melt, facilitating the camera to observe the entire screen, improving the test efficiency, and scraping the moisture on the surface of the touch screen by the front baffle to avoid the residual moisture affecting the test results. Brief Description of the Drawings

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the capacitive touch screen compressive performance test device of the present invention; Figure 2 It is a combined three-dimensional structural schematic diagram of the detection platform, the fixing component, the driving component and the sealing component of the present invention; Figure 3 It is a combined three-dimensional structural schematic diagram of the three-axis moving frame and the air guide plate of the present invention; Figure 4 It is a combined three-dimensional structural schematic diagram of the air guide plate, the extrusion rod and the driving component of the present invention; Figure 5 It is an exploded view of the extrusion rod of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the fixing component of the present invention; Figure 7 It is a combined three-dimensional structural schematic diagram of the fixing plate, the first limiting plate and the second limiting plate of the present invention; Figure 8 It is a sectional view of the combination of the fixing plate and the first limiting plate of the present invention; Figure 9 It is a combined three-dimensional structural schematic diagram of the mounting plate, the baffle and the top plate of the present invention; Figure 10 It is a diagram of the baffle in the extended state of the present invention.

[0017] Among them, the above-mentioned drawings include the following reference numerals: 1-detection platform, 2-electric conveyor belt, 3-three-axis moving frame, 4-air guide plate, 4001-air guide hole, 5-touch screen, 201-fixing frame, 202-first driving member, 203-fixing plate, 20301-through groove, 204-first limiting plate, 205-second limiting plate, 206-rotating ring, 20601-first electromagnet, 207-direct drive motor, 208-second driving member, 20801-second electromagnet, 209-extrusion rod, 20901-extrusion head, 301-third driving member, 302-mounting plate, 303-fourth driving member, 304-baffle, 305-fifth driving member, 306-top plate, 30601-through hole. Detailed implementation manners

[0018] The present invention will be further described in detail below in conjunction with the drawings and specific implementation manners, but the protection scope and application scope of the present invention are not limited.

[0019] Embodiment 1 Referring to Figures 1-10 As shown, a capacitive touch screen compressive performance testing device includes a detection platform 1 and an electric conveyor belt 2; an electric conveyor belt 2 is installed on the detection platform 1; a camera is installed on the detection platform 1; It further includes a three-axis moving frame 3, an air guide plate 4, an extrusion rod 209, a driving assembly, a fixing assembly and a sealing assembly; a three-axis moving frame 3 is installed on the detection platform 1; an air guide plate 4 is connected to the three-axis moving frame 3; the air guide plate 4 is controlled by the three-axis moving frame 3 to move in the up and down, front and back, and left and right directions; an infrared alignment sensor is installed on the detection platform 1; the infrared alignment sensor is aligned with the air guide plate 4 in the front and back directions; the air guide plate 4 is internally provided with a cavity and is communicated with an external air conditioning device through a pipeline; an air pump, a refrigeration unit and a heating unit are arranged in the external air conditioning device, which has the functions of pumping air, supplying air and adjusting the temperature of the gas; a plurality of air guide holes 4001 are opened on the lower side of the air guide plate 4; the air guide holes 4001 are communicated with the internal cavity of the air guide plate 4; a driving assembly is installed on the three-axis moving frame 3; four extrusion rods 209 are connected to the driving assembly; the extrusion rods 209 are driven by the driving assembly to move up and down and rotate; all the extrusion rods 209 surround the outside of the air guide plate 4; a fixing assembly is installed on the detection platform 1; the edge of the touch screen 5 is fixed by the fixing assembly; four through grooves 20301 are opened on the fixing assembly; a sealing assembly is installed on the detection platform 1; a cover plate is connected to the sealing assembly in a lifting manner.

[0020] The fixing component includes a fixing frame 201, a first driving member 202, a fixing plate 203, a first limiting plate 204 and a second limiting plate 205; the fixing frame 201 is fixedly connected to the detection platform 1; the fixing frame 201 is located above the electric conveyor belt 2; four first driving members 202 are fixedly connected to the inner side wall of the fixing frame 201, and the first driving member 202 is an electric push rod; a fixing plate 203 is fixedly connected to the telescopic end of each first driving member 202; the four fixing plates 203 are distributed in a rectangle; a through groove 20301 is formed in each fixing plate 203, and each through groove 20301 is connected to an external air conditioning device through a pipeline; a first limiting plate 204 is respectively installed on the front and rear fixing plates 203; the cross section of the first limiting plate 204 is L-shaped; a second limiting plate 205 is respectively installed on the left and right fixing plates 203.

[0021] Furthermore, to facilitate intercepting flying glass debris, the upper surface of each fixing plate 203 is set higher than the upper surfaces of the first limiting plate 204 and the second limiting plate 205.

[0022] Furthermore, to avoid scratching the edge of the touch screen 5 when fixing the touch screen 5, the surfaces of the first limiting plate 204 and the second limiting plate 205 are covered with a rubber layer.

[0023] Each through groove 20301 can also be connected to an external water pump through a pipeline.

[0024] The driving component includes a rotating ring 206, a direct drive motor 207 and a second driving member 208; the rotating ring 206 is rotatably connected to the air guide plate 4; four first electromagnets 20601 arranged in a ring are fixedly connected to the rotating ring 206; the shape of the first electromagnet 20601 is ring-shaped; each first electromagnet 20601 is in sliding contact with an adjacent extrusion rod 209; the extrusion rod 209 is made of a magnetic material; the direct drive motor 207 is fixedly connected to the three-axis moving frame 3; the output end of the direct drive motor 207 is fixedly connected to the rotating ring 206; the second driving member 208 is fixedly connected to the three-axis moving frame 3, and the second driving member 208 is an electric push rod; a second electromagnet 20801 is fixedly connected to the telescopic end of the second driving member 208; the second electromagnet 20801 is sleeved on an adjacent extrusion rod 209.

[0025] A pressing head 20901 is screwed to the lower end of each extrusion rod 209, and each pressing head 20901 can be made of different materials, specifically, it can be set as aluminum alloy, plastic, rubber, cloth with different hardnesses.

[0026] The sealing assembly includes a third driving member 301, a mounting plate 302, a fourth driving member 303, a baffle 304, a fifth driving member 305 and a top plate 306; a third driving member 301 is fixedly connected to the detection platform 1, and the third driving member 301 is an electric push rod; the mounting plate 302 is fixedly connected to the telescopic end of the third driving member 301; the mounting plate 302 is driven by the third driving member 301 to move back and forth; four fourth driving members 303 arranged in a rectangle are fixedly connected to the mounting plate 302, and the fourth driving member 303 is an electric push rod; four baffles 304 arranged in a rectangle are slidably connected to the inner side of the mounting plate 302; a rubber layer is wrapped around the lower side of the front baffle 304; each baffle 304 is fixedly connected to the telescopic end of the adjacent fourth driving member 303; the baffle 304 is driven by the fourth driving member 303 to move up and down; a fifth driving member 305 is fixedly connected to the detection platform 1, and the fifth driving member 305 is an electric push rod; a top plate 306 is slidably connected to the upper side of the mounting plate 302; the telescopic end of the fifth driving member 305 is fixedly connected to the top plate 306; a through hole 30601 is provided at the center of the top plate 306.

[0027] The following is a detailed description of the process of batch testing for the touch screen 5; First, the touch screen 5 is sequentially placed on the central axis of the electric conveyor belt 2 through the peripheral transfer device, and the front and rear edges of the touch screen 5 are respectively kept parallel to the front and rear edges of the electric conveyor belt 2. Subsequently, the touch screen 5 is transmitted to the right through the electric conveyor belt 2, and the position of the touch screen 5 is monitored by the infrared alignment sensor on the detection platform 1. When the center of the touch screen 5 is aligned with the center of the air guide plate 4, the electric conveyor belt 2 pauses to move, and the three-axis moving frame 3 is controlled to drive the air guide plate 4 and its connecting parts to move downward, so that the air guide plate 4 fits with the upper surface of the touch screen 5. Then, after the air guide plate 4 fits with the touch screen 5, the peripheral air conditioning device is started to extract air, so that the air is discharged through the air guide holes 4001 and the cavity of the air guide plate 4, thereby generating suction at the air guide holes 4001, and the touch screen 5 is sucked by the suction of the air guide holes 4001. Then, the three-axis moving frame 3 is controlled to drive the air guide plate 4 and the touch screen 5 to move upward until the upper surface of the touch screen 5 is flush with the upper surfaces of the first limiting plate 204 and the second limiting plate 205. The first driving member 202 is controlled to drive the corresponding fixing plate 203 to move towards the center of the touch screen 5, so that the first limiting plate 204 and the second limiting plate 205 are respectively in contact with the edges of the touch screen 5, and the closed-loop rectangle formed by the four fixing plates 203 surrounds the outside of the touch screen 5, and the bottom of the touch screen 5 is supported by the first limiting plate 204 with an L-shaped cross section. In this way, the touch screen 5 is fixed by the cooperation of the first limiting plate 204 and the second limiting plate 205, preventing the touch screen 5 from sliding during the test and improving the reliability of the test device. Note that by covering the surfaces of the first limiting plate 204 and the second limiting plate 205 with a rubber layer, the edge of the touch screen 5 is prevented from being scratched during fixation. At this time, the peripheral air conditioning device is controlled to stop extracting air, and the three-axis moving frame 3 is controlled to drive the air guide plate 4 to disengage from the touch screen 5. It should be noted that in the initial state, all the first electromagnets 20601 are in the working state, and the first electromagnets 20601 fix the extrusion rod 209 in the middle by magnetic force, and the extrusion rod 209 located at the rear is aligned with the second electromagnet 20801 on the rear second driving member 208, and at this time the second electromagnet 20801 stops working. After the air guide plate 4 disengages from the touch screen 5, the second driving member 208 is controlled to drive the first electromagnet 20601 to move downward to contact the rear extrusion rod 209, and the second electromagnet 20801 is controlled to start working, sucking the extrusion rod 209 by magnetic force. Then, the rear first electromagnet 20601 is controlled to stop working, so that the rear extrusion rod 209 can slide up and down in the corresponding first electromagnet 20601. Then, the second driving member 208 is controlled to drive the extrusion rod 209 and the extrusion head 20901 to move downward, so that the extrusion head 20901 protrudes from the lowermost side of the air guide plate 4. Subsequently, the three-axis moving frame 3 is driven to drive the extrusion rod 209 and the extrusion head 20901 to move back and forth, left and right, and up and down, so that the extrusion head 20901 applies pressure to each part of the touch screen 5 in turn.And observe whether the touch screen 5 is damaged through the camera on the detection platform 1, so as to realize the compressive performance test of the touch screen 5.

[0028] After the compressive performance test is completed, control the second driving member 208 to move the extrusion head 20901 upward to the initial position, and with the same steps as above, make the air guide plate 4 adsorb the touch screen 5 again, then control the first driving member 202 to separate the first limiting plate 204 and the second limiting plate 205 from the touch screen 5, and then control the three-axis moving frame 3 to move the touch screen 5 to the electric conveyor belt 2, and separate the air guide plate 4 from the touch screen 5. At this time, the tested touch screen 5 is conveyed to the right through the electric conveyor belt 2, and the touch screen 5 to be tested is synchronously conveyed below the air guide plate 4, so as to realize continuous testing of a batch of touch screens 5 one by one, so that the testing device can be applied to the factory inspection of the assembly line workshop, and during the testing process, there is no need for staff to assist in placing and taking out the touch screen 5, improving the testing efficiency.

[0029] On this basis, considering that the testing device can also be used in the R & D laboratory, the purpose is to test the compressive performance of newly developed materials used on the touch screen 5, focusing on the ultimate compressive performance of the touch screen 5 in various usage scenarios. The testing conditions of the testing device used in the assembly line workshop are usually relatively single and cannot meet the testing conditions in the laboratory. For example, the touch screen 5 is currently widely used in household cars. When the car is exposed to the sun for a long time in summer, the surface temperature can reach up to 70 °C - 80 °C at most, and high temperature will reduce the compressive strength of the touch screen 5. However, the conventional touch screen 5 compressive testing device has single testing conditions for the touch screen 5 and cannot meet the various testing requirements for the touch screen 5 used in the car.

[0030] Therefore, when the testing device is used in the R & D laboratory, first fix the touch screen 5 to be tested in the above-mentioned way of fixing the touch screen 5, and start the heating and air supply functions of the peripheral air conditioning device. Send high-temperature gas into the air guide plate 4 through the peripheral air conditioning device, and control the three-axis moving frame 3 to drive the air guide plate 4 close to the upper surface of the touch screen 5, so that the high-temperature gas blows to the upper surface of the touch screen 5 through the air guide holes 4001, and the temperature of the touch screen 5 is raised to the range of 70 °C - 80 °C, so as to simulate the situation of the touch screen 5 in a high-temperature environment inside the car. Then, conduct a compressive test on the touch screen 5 to test the compressive performance of the touch screen 5 in a high-temperature environment. Similarly, by controlling the refrigeration unit in the peripheral air conditioning device to reduce the air temperature, low-temperature air flow is blown on the touch screen 5, so as to simulate the situation of the touch screen 5 in a low-temperature environment, and test the compressive test of the touch screen 5 in a low-temperature environment.

[0031] Further, before the test, extrusion heads 20901 made of different materials can be installed on the four extrusion rods 209. For example, extrusion heads 20901 made of aluminum alloy, plastic, rubber, and fabric materials are installed respectively. Then, when the extrusion rods 209 perform extrusion tests on the touch screen 5, with the top-down view as the reference, the direct drive motor 207 is controlled to drive the rotating ring 206 to rotate clockwise, so that the extrusion heads 20901 made of different materials can all face the rear side. Then, the second driving member 208 drives the rear extrusion rod 209 and the extrusion head 20901 to move downward, thus realizing the extrusion of the touch screen 5 by the extrusion heads 20901 made of different materials, so as to simulate the extrusion of the touch screen 5 by objects made of different materials during actual use, thereby testing the compressive performance of the touch screen 5 against objects made of different materials, enriching the test conditions, and improving the diversity of experimental research and development test data.

[0032] In summary, when the test device is used in a production line workshop, it can quickly test a batch of touch screens 5. When used in a laboratory, it can test the compressive performance of the touch screen 5 under different usage conditions, so that the test device is applicable to both the production line workshop and the laboratory environment, improving the versatility of the test device and reducing the test cost.

[0033] On this basis, when the touch screen 5 is tested and breaks due to unqualified quality, the glass fragments generated at this time will be scattered around the breakage. Since the glass fragment particles are very small, it is not easy to clean them up manually, and the cleaning efficiency and effect are low. Therefore, after the touch screen 5 breaks, the second driving member 208 is controlled to drive the extrusion head 20901 to move upward to the initial position, and the three-axis moving frame 3 is controlled to drive the air guide plate 4 close to the damaged area of the touch screen 5. At the same time, the external air conditioning device is controlled to extract air from the air guide plate 4, so that the broken glass fragments are sucked into the internal cavity of the air guide plate 4 through the suction force generated by the air guide holes 4001, and discharged to the air pump of the external air conditioning device. The air pump transports the glass fragments to the debris collection area. And during the process of the air guide plate 4 sucking air, the three-axis moving frame 3 is controlled to drive the air guide plate 4 to move circumferentially around the damaged area of the touch screen 5 to expand the cleaning range of the air guide plate 4 to ensure that the glass fragments around the damaged area are cleaned up. In this way, the automatic cleaning of the glass fragments can be realized by the cooperation of the three-axis moving frame 3 and the air guide plate 4, improving the efficiency and quality of cleaning the glass fragments. Moreover, since the upper surface of the fixing plate 203 is higher than the upper surfaces of the first limiting plate 204 and the second limiting plate 205, the splashing glass fragments are intercepted by the fixing plate 203 to prevent the glass fragments from splashing onto the electric conveyor belt 2, reducing the cleaning difficulty of the glass fragments.

[0034] Considering that due to the obstruction of the fixing plate 203, the air guide plate 4 cannot move to the corner fitting position of the two fixing plates 203, resulting in dead corners in the cleaning range of the air guide plate 4. To solve the above problems, before the test, first use an air delivery pipe to connect the peripheral air conditioning device with the through groove 20301. After the touch screen 5 is damaged, first control the peripheral air conditioning device to start the air supply function, and supply air to all the through grooves 20301 through the peripheral air conditioning device, so that the air blows from the through groove 20301 towards the center of the touch screen 5, thereby blowing the glass fragments located at the corner fitting position of the two fixing plates 203 towards the center side close to the touch screen 5. Subsequently, control the peripheral air conditioning device to extract air from the air guide plate 4 to complete the cleaning of the glass fragments.

[0035] It is also considered that when the air flow blows towards the touch screen 5 through the air guide holes 4001 to simulate the touch screen 5 in a high-temperature or low-temperature environment, the air flow blowing towards the touch screen 5 is prone to diffuse around at this time, and the efficiency of heating or cooling the air flow is slow, resulting in waste of heat. Therefore, before blowing air through the air guide holes 4001, control the third driving member 301 to drive the mounting plate 302 to move forward, and at the same time control the fifth driving member 305 to drive the top plate 306 to move forward, so that the mounting plate 302 and the top plate 306 move together to the upper side of the closed-loop rectangle formed by the four fixing plates 203. Then control the three-axis moving frame 3 to drive the air guide plate 4 to move into the through hole 30601, so as to form a closed space between the air guide plate 4, the touch screen 5, the fixing plate 203, the first limiting plate 204, the second limiting plate 205, the mounting plate 302 and the top plate 306. At this time, control the air flow to blow towards the touch screen 5 through the air guide plate 4, thereby blocking the high-temperature or low-temperature gas from diffusing to the outside through the closed space, reducing heat dissipation, and improving the efficiency of heating or cooling the touch screen 5. Moreover, the air flow in the closed space can flow back to the air pump through the through groove 20301. In this way, the high-temperature air flow or low-temperature air flow can circulate, improving the utilization rate of thermal energy, thereby reducing energy consumption and lowering the test cost.

[0036] It is also considered that the touch screen 5 is often used on outdoor interactive display screens. When the outdoor touch screen 5 is in a low-temperature environment in winter, ice layers are likely to form on its surface. Compared with directly applying pressure to the touch screen 5, when pressure is applied to the ice layer, the ice layer will quickly crack, resulting in the concentration of pressure in the cracks, causing local stress on the touch screen 5. Coupled with the low temperature of the ice layer leading to a decrease in the anti-extrusion ability of the touch screen 5, it is necessary to test the anti-extrusion performance of the touch screen 5 when covered with ice layers under extreme conditions. Therefore, after simulating various usage scenarios of the touch screen 5 above, and at this time the mounting plate 302 still covers the upper sides of the four fixing plates 203, and each baffle 304 is aligned with the inner side wall of the adjacent fixing plate 203. At this time, control the fourth driving member 303 to drive the corresponding baffle 304 to move downward, so that each baffle 304 fits with the through groove 20301 of the adjacent fixing plate 203. Subsequently, control the fifth driving member 305 to drive the top plate 306 to move backward on the mounting plate 302, so that the upper side of the mounting plate 302 is in an open state. At this time, water can be supplied to the surface of the touch screen 5 by the staff, and the baffle 304 blocks the water flow from discharging through the through groove 20301. In this way, a certain thickness of water can accumulate on the surface of the touch screen 5. Then control the fifth driving member 305 to drive the top plate 306 to move forward to cover the upper side of the mounting plate 302 again. Then control the three-axis moving frame 3 to drive the air guide plate 4 to move into the through hole 30601. Subsequently, blow low-temperature air to the touch screen 5 through the air guide plate 4, so that the closed space formed by the mounting plate 302 gradually cools down to the freezing point, so that the water condenses into an ice layer on the touch screen 5. In this way, the situation where the touch screen 5 is covered with an ice layer outdoors is simulated. When the ice layer on the surface of the touch screen 5 condenses, control the air guide plate 4 to disengage from the through hole 30601, and then control the fifth driving member 305 to drive the top plate 306 to move backward to expose the ice layer. Subsequently, control the three-axis moving frame 3 to drive the extrusion rod 209 to perform compressive tests on various parts of the touch screen 5, so as to test the anti-extrusion performance of the touch screen 5 when there is an ice layer, further enriching the test conditions.

[0037] On this basis, since the ice layer covers the surface of the touch screen 5, after the extrusion of the touch screen 5 is completed, the camera is blocked by the ice layer and cannot immediately observe the surface condition of the touch screen 5. At this time, it is usually necessary to blow high-temperature air through the air guide plate 4 to heat the ice layer, melt the ice layer into water and drain the water before the entire screen can be observed. This process takes a long time and reduces the test efficiency. Therefore, before the artificial water injection operation, first pull out the air pipe between the peripheral air conditioning device and the through groove 20301, connect the peripheral water pump and the through groove 20301 with a water pipe, and replace all four extrusion heads 20901 with rubber materials of low hardness. When the ice layer needs to be melted, control the second driving member 208 to extend each extrusion head 20901 out of the lower surface of the air guide plate 4 in sequence and fix it with the corresponding first electromagnet 20601. Then control the three-axis moving frame 3 to drive the extrusion head 20901 to contact the ice layer, and then control the direct drive motor 207 to drive the extrusion head 20901 to rotate, so as to continuously scrape the surface of the ice layer through the extrusion head 20901 and break the ice layer into small ice blocks. It should be noted here that the extrusion head 20901 made of rubber material can avoid scratching the surface of the touch screen 5. At this time, control the high-temperature air flow to melt the ice blocks, so as to accelerate the melting speed of the ice layer. Then control the fourth driving member 303 to drive all the baffles 304 to retract upward into the mounting plate 302, and at this time the baffles 304 are separated from the through groove 20301. Subsequently, control the peripheral water pump to start pumping water from the through groove 20301, so that the melted water is discharged outwards through the through groove 20301 and the peripheral water pump to the waste water collection place, realizing the discharge of the water on the surface of the touch screen 5. In this way, the time required for the ice layer to melt can be reduced, so that the camera can observe the entire screen and improve the test efficiency. Moreover, at this time, there is still moisture remaining on the touch screen 5. Control the fourth driving member 303 to drive the front baffle 304 to move downward so that the lower surface of the baffle 304 is flush with the upper surface of the touch screen 5. Then control the third driving member 301 to drive the mounting plate 302 to move backward, thereby driving the front baffle 304 to scrape the surface of the touch screen 5 backward until the front baffle 304 fits against the inner wall of the rear fixing plate 203. In this way, the moisture on the upper surface of the touch screen 5 is scraped off by the front baffle 304, avoiding the remaining moisture from affecting the detection result. It should be noted here that the lower side of the front baffle 304 is wrapped with a rubber layer, which can avoid scratching the surface of the touch screen 5 by the baffle 304.

[0038] Embodiment 2 On the basis of Embodiment 1, with reference to Figure 7 and Figure 8 shown, furthermore, for the convenience of the staff to replace the first limiting plate 204 and the second limiting plate 205 to adapt to touch screens 5 of different sizes, both the first limiting plate 204 and the second limiting plate 205 are arranged to be bolted to the corresponding fixing plate 203.

[0039] Considering the different sizes of the touch screen 5, the first limit plate 204 and the second limit plate 205 with corresponding sizes can be formulated for touch screens 5 of different sizes. Since the first limit plate 204 and the second limit plate 205 are both bolted to the fixing plate 203, it is convenient for the staff to replace the first limit plate 204 and the second limit plate 205, so as to adapt to touch screens 5 of different sizes and improve the practicability of the testing device.

[0040] A method for testing the compressive performance of a capacitive touch screen includes the following working steps: S1: Loading. The touch screen 5 is placed on the electric conveyor belt 2 through an external transfer device, and then the touch screen 5 is transported through the electric conveyor belt 2. S2: Fixing. The touch screen 5 is adsorbed by the air guide plate 4 and clamped and fixed by the fixing component. S3: Testing. The touch screen 5 is subjected to extrusion testing through the extrusion rod 209, which can simulate the use environments of the display screen at high temperature, low temperature and with ice on the surface, improve the testing conditions and obtain more test data. S4: Checking the result. Whether the touch screen 5 is damaged is observed through the camera on the detection platform 1.

[0041] The technical principle of the embodiments of the present invention has been described above in combination with specific embodiments. These descriptions are only for explaining the principle of the embodiments of the present invention and cannot be construed as a limitation on the protection scope of the embodiments of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the embodiments of the present invention without creative labor, and these embodiments will fall within the protection scope of the embodiments of the present invention.

Claims

1. A capacitive touch screen compressive performance testing device, comprising a detection platform (1); an electric conveyor belt (2) for conveying the touch screen (5) is installed on the detection platform (1); a camera is installed on the detection platform (1); characterized in that, A three-axis moving frame (3) is installed on the detection platform (1); an air guide plate (4) is connected to the three-axis moving frame (3); the air guide plate (4) is driven by the three-axis moving frame (3) to move up and down, back and forth, and left and right; an infrared alignment sensor is installed on the detection platform (1); the infrared alignment sensor is aligned with the air guide plate (4) in the front-back direction; a cavity is provided inside the air guide plate (4), and it is communicated with an external air conditioning device through a pipeline; an air pump, a refrigeration unit and a heating unit are arranged in the external air conditioning device, which has the functions of pumping air, supplying air and regulating the temperature of the gas; a plurality of air guide holes (4001) are formed on the lower side of the air guide plate (4); the air guide holes (4001) are communicated with the internal cavity of the air guide plate (4); a driving assembly is installed on the three-axis moving frame (3); a plurality of pressing rods (209) are connected to the driving assembly; the pressing rods (209) are driven by the driving assembly to move up and down and rotate; all the pressing rods (209) surround the outer side of the air guide plate (4); a fixing assembly for fixing the touch screen (5) is installed on the detection platform (1); a plurality of through grooves (20301) for cleaning glass debris are formed on the fixing assembly; a sealing assembly for reducing the test energy consumption is installed on the detection platform (1); a cover plate for covering the through grooves (20301) is connected to the sealing assembly in a lifting manner.

2. The capacitive touch screen compressive performance testing device according to claim 1, characterized in that, The fixing assembly includes a fixing frame (201); the fixing frame (201) is fixedly connected to the detection platform (1); the fixing frame (201) is located above the electric conveyor belt (2); four first driving members (202) are fixedly connected to the fixing frame (201); a fixing plate (203) is fixedly connected to the telescopic end of each first driving member (202); the four fixing plates (203) are distributed in a rectangle; a through groove (20301) for cleaning glass debris is formed on each fixing plate (203), and each through groove (20301) is communicated with the external air conditioning device through a pipeline; a first limiting plate (204) for fixing and supporting the touch screen (5) is installed on the front and rear fixing plates (203) respectively; the cross section of the first limiting plate (204) is L-shaped; a second limiting plate (205) is installed on the left and right fixing plates (203) respectively.

3. The capacitive touch screen compressive performance testing device according to claim 2, characterized in that, The upper surface of each fixing plate (203) is set higher than the upper surfaces of the first limiting plate (204) and the second limiting plate (205).

4. The capacitive touch screen compressive performance testing device according to claim 3, characterized in that, The surfaces of the first limiting plate (204) and the second limiting plate (205) are covered with a rubber layer.

5. The capacitive touch screen compressive performance testing device according to claim 2, characterized in that, Each through groove (20301) can also be communicated with an external water pump through a pipeline.

6. A capacitive touch screen compressive performance testing device according to claim 1, characterized in that, The driving assembly includes a swivel ring (206); the swivel ring (206) is rotatably connected to the air guide plate (4); several first electromagnets (20601) arranged in a ring are fixedly connected to the swivel ring (206); the first electromagnets (20601) are in the shape of a ring; each first electromagnet (20601) is in sliding contact with the adjacent extrusion rod (209); the extrusion rod (209) is made of a magnetic material; a direct drive motor (207) is fixedly connected to the three-axis moving frame (3); the output end of the direct drive motor (207) is fixedly connected to the swivel ring (206); a second driving member (208) is fixedly connected to the three-axis moving frame (3); a second electromagnet (20801) is fixedly connected to the telescopic end of the second driving member (208); the second electromagnet (20801) is sleeved on the adjacent extrusion rod (209).

7. The capacitive touch screen compressive performance testing device according to claim 6, characterized in that, A pressing head (20901) is screwed to the lower end of each extrusion rod (209), and each pressing head (20901) can be made of different materials.

8. A capacitive touch screen compressive performance testing device according to claim 2, characterized in that, The sealing assembly includes a third driving member (301); the third driving member (301) is fixedly connected to the detection platform (1); a mounting plate (302) is fixedly connected to the telescopic end of the third driving member (301); the mounting plate (302) is driven to move back and forth by the third driving member (301); several fourth driving members (303) arranged in a rectangle are fixedly connected to the mounting plate (302); several baffles (304) arranged in a rectangle for covering the through groove (20301) are slidably connected to the inner side of the mounting plate (302); a rubber layer is wrapped around the lower side of the front baffle (304); each baffle (304) is fixedly connected to the telescopic end of the adjacent fourth driving member (303); the baffle (304) is driven to move up and down by the fourth driving member (303); a fifth driving member (305) is fixedly connected to the detection platform (1); a top plate (306) is slidably connected to the upper side of the mounting plate (302); the telescopic end of the fifth driving member (305) is fixedly connected to the top plate (306); a through hole (30601) is opened at the center of the top plate (306).

9. A capacitive touch screen compressive performance testing device according to claim 4, characterized in that, Both the first limiting plate (204) and the second limiting plate (205) are set to be fixedly connected to the corresponding fixing plate (203) by bolts.

10. A test method for the compressive performance of a capacitive touch screen, characterized in that, This test method uses a capacitive touch screen compressive performance test device described in claim 9, and includes the following working steps: S1: Loading, the touch screen (5) is placed on the electric conveyor belt (2) through an external transfer device, and then the touch screen (5) is conveyed by the electric conveyor belt (2). S2: Fixing, the touch screen (5) is adsorbed by the air guide plate (4), and the touch screen (5) is clamped and fixed by the fixing assembly. S3: Testing, the touch screen (5) is subjected to extrusion testing by the extrusion rod (209), which can simulate the use state of the touch screen in high temperature, low temperature and surface icing environments, improve the test conditions and obtain more test data. S4: Checking the result, observing whether the touch screen (5) is damaged through the camera on the detection platform (1).

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