A testing device suitable for mobile phone screens of various sizes

Abstract

This invention discloses a testing device suitable for mobile phone screens of various sizes, including a worktable and a testing component. A driving component is mounted on the upper surface of the worktable. The testing component includes a cylinder, a mounting block, and a scribing testing mechanism. The mounting block is mounted on the lower end of the cylinder, and the scribing testing mechanism is mounted inside the mounting block. The scribing testing mechanism includes a motor, a rotating seat, a limiting plate, and several test pens. The motor and the limiting plate are mounted inside the mounting block. The output end of the motor is connected to a rotating shaft. The limiting plate has a bearing that mates with the rotating shaft. The rotating seat is mounted on the lower end of the rotating shaft, and the test pens are arranged in a ring at intervals on the lower end of the rotating seat. During testing, the motor drives the rotating seat to rotate, causing the test pens on the rotating seat to rotate. Simultaneously, the driving component moves the test pens back and forth, allowing the test pens to test more positions on the mobile phone screen, thus improving the accuracy of the scribing test.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and more specifically to a testing device suitable for mobile phone screens of various sizes. Background Technology

[0002] With the rapid development of smartphone applications, the requirements for the lifespan of touchscreens on smartphones are becoming increasingly stringent.

[0003] Existing touchscreen scribing tests involve drawing lines back and forth on the phone screen with a test pen. However, the test can only measure the position along the pen's path, resulting in inaccurate results. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a testing device for mobile phone screens of various sizes. During testing, a motor drives a rotating base to rotate, and the test pen on the rotating base rotates. At the same time, a drive component drives the test pen to move back and forth, so that the test pen can test more positions on the mobile phone screen, thereby improving the accuracy of the line drawing test.

[0005] The technical solution provided by the present invention to solve the above problems is as follows: a testing device for mobile phone screens of various sizes, including a worktable; and a testing component; a driving component is provided on the upper surface of the worktable, the driving component being used to drive the testing component to move on the worktable;

[0006] The test assembly includes a cylinder, a mounting block, and a scribing test mechanism. The mounting block is installed at the lower end of the cylinder, and the scribing test mechanism is installed inside the mounting block. The cylinder is used to drive the mounting block to move up and down.

[0007] The marking test mechanism includes a motor, a rotating seat, a limiting plate, and several test pens. The motor and the limiting plate are installed in the mounting block. The output end of the motor is connected to the rotating shaft. The limiting plate is provided with a bearing that cooperates with the rotating shaft. The rotating seat is installed at the lower end of the rotating shaft. Several test pens are installed at an annular interval at the lower end of the rotating seat.

[0008] The workbench is equipped with several mobile phone screen fixing components, which can fix mobile phone screens of various sizes.

[0009] Preferably, the test pen includes a pen barrel, a first magnet, a second magnet, and a fixing rod. The fixing rod has an axial movable hole inside. One end of the pen barrel extends into the movable hole. The first magnet is installed on the pen barrel at one end located inside the movable hole. The second magnet is installed at the bottom of the movable hole. The first magnet and the second magnet are arranged with the same poles repelling each other.

[0010] Preferably, the drive assembly includes a second motor, a lead screw, a movable frame, and a fixed frame. The fixed frame is mounted on the upper surface of the workbench, and a guide rail that mates with the movable frame is provided on the fixed frame. The test assembly is mounted on the lower end of the movable frame. The lead screw is connected to the output end of the second motor, and a threaded hole that mates with the lead screw is provided on the movable frame.

[0011] Preferably, guide blocks are provided on both sides of the mounting block, guide holes are provided on the guide blocks, guide rods are provided in the guide holes, and the upper ends of the guide rods are connected to the movable frame.

[0012] Preferably, the mobile phone screen fixing assembly includes a base plate and a limiting fixing assembly mounted on the base plate; the limiting fixing assembly includes a clamping airbag and two L-shaped plates, the two L-shaped plates are symmetrically mounted on both sides of the upper surface of the base plate, the two L-shaped plates and the base plate form a convex fixing cavity, the clamping airbag is adapted to the shape of the fixing cavity, and the clamping airbag is connected to an external air source.

[0013] Preferably, the clamping airbag includes a horizontal section and L-shaped limiting sections disposed at both ends of the horizontal section; the L-shaped limiting section includes a limiting section one and a limiting section two, and a pleated section is provided at the connection between the limiting section one and the limiting section two, the pleated section being able to unfold when inflated.

[0014] Preferably, the limiting and fixing assembly further includes a pressure relief mechanism, which is used to relieve pressure when the air pressure inside the clamping airbag is too high. The pressure relief mechanism includes an air outlet pipe, a valve seat, a piston, and a second spring. The valve seat has a movable cavity, and the piston is movably installed in the movable cavity. One end of the air outlet pipe is connected to the clamping airbag, and the other end is connected to the movable cavity. One end of the second spring is connected to the end of the piston away from the air outlet pipe, and the other end is connected to the bottom of the movable cavity. The valve seat has a vertical pressure relief hole, which is connected to the movable cavity. When the air pressure inside the clamping airbag is too high, the gas inside the clamping airbag squeezes the piston, causing the piston to move in the movable cavity, and then the gas flows out from the pressure relief hole.

[0015] Preferably, the valve seat is further provided with a vent pipe, the clamping airbag is provided with an air inlet pipe, the end of the air inlet pipe away from the clamping airbag is connected to the vent pipe, and the vent pipe is provided with a control valve.

[0016] Preferably, the pressure relief mechanism further includes a transmission assembly, which drives the transmission assembly to rotate when the piston moves, thereby driving the control valve to control the opening and closing of the air intake pipe; the transmission assembly includes a transmission rack and a transmission gear, the valve seat is provided with a mounting cavity, the mounting cavity is connected to the movable cavity, the transmission rack is horizontally disposed at one end of the piston, the transmission gear is rotatably disposed in the mounting cavity, and the transmission gear is connected to the control rod of the control valve.

[0017] Preferably, a first synchronous pulley is coaxially arranged on the transmission gear, and a second synchronous pulley is coaxially arranged on the control rod of the control valve, and the first synchronous pulley and the second synchronous pulley are connected by a synchronous belt.

[0018] Compared with the prior art, the advantages of the present invention are: the present invention is equipped with a testing component, in which a motor drives a rotating seat to rotate, and the testing pen on the rotating seat rotates. At the same time, the driving component drives the testing pen to move back and forth, so that the testing pen can test more positions on the mobile phone screen, improving the accuracy of the line drawing test; in addition, users can perform separate back-and-forth line drawing tests or separate circle line drawing tests according to their needs, making it more versatile. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0020] Figure 1 This is the front view of the present invention;

[0021] Figure 2 This is a top view of the present invention;

[0022] Figure 3 This is a cross-sectional view of the mounting block of the present invention;

[0023] Figure 4 yes Figure 1 Enlarged view of point B in the middle;

[0024] Figure 5 This is a cross-sectional view of the test pen;

[0025] Figure 6 This is a bottom view of the rotary base;

[0026] Figure 7 This is a front view of the mobile phone screen fixing component of the present invention;

[0027] Figure 8 This is a top view of the mobile phone screen fixing component of the present invention;

[0028] Figure 9 This is a cross-sectional view of the pressure relief mechanism of the present invention;

[0029] Figure 10 This is a cross-sectional view of the pressure relief mechanism of the present invention during pressure relief;

[0030] Figure 11 yes Figure 5 Enlarged view of point A in the middle;

[0031] Figure 12 This is a schematic diagram of the present invention when fixing the mobile phone screen.

[0032] Attached diagram labels: 1. L-shaped plate, 2. Base plate, 3. Valve seat, 4. Clamping airbag, 5. Limiting plate one, 6. Pleated section, 7. Pressure relief hole, 8. Movable chamber, 9. Spring, 10. Mounting chamber, 11. Transmission gear, 12. Synchronizing pulley one, 13. Vent pipe, 14. Control valve, 15. Synchronizing pulley two, 16. Inlet pipe, 17. Outlet pipe, 18. Piston, 19. Annular sealing ring, 20. Transmission rack, 21. Limiting section one, 22. Limiting section two 23. Mobile phone screen; 24. Synchronous belt; 25. Movable frame; 26. Lead screw; 27. Fixed frame; 28. Roller; 29. ​​Guide rail; 30. Workbench; 31. Motor II; 32. Guide rod; 33. Guide block; 34. Mounting block; 35. Motor I; 36. Rotating shaft; 37. Limiting plate II; 38. Bearing; 39. Rotating seat; 40. Fixed rod; 41. Magnet I; 42. Magnet II; 43. Pen barrel; 44. Movable hole; 45. Cylinder. Detailed Implementation

[0033] The following will describe in detail the implementation of the present invention with reference to the accompanying drawings and embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0034] In the description of this invention, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0038] It should also be understood that the terminology used in this specification of embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. As used in this specification of embodiments of the invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0039] As shown in the accompanying drawings, a testing device for mobile phone screens of various sizes includes a worktable 30 and a testing component. A driving component is provided on the upper surface of the worktable 30, and the driving component is used to drive the testing component to move on the worktable 30.

[0040] The test assembly includes a cylinder 45, a mounting block 34, and a scribing test mechanism. The mounting block 34 is mounted on the lower end of the cylinder 45, and the scribing test mechanism is mounted inside the mounting block 34. The cylinder 45 is used to drive the mounting block 34 to move up and down.

[0041] The marking test mechanism includes a motor 35, a rotating seat 39, a limiting plate 37, and several test pens. The motor 35 and the limiting plate 37 are installed in the mounting block 34. The output end of the motor 35 is connected to the rotating shaft 36. The limiting plate 37 is provided with a bearing 38 that cooperates with the rotating shaft 36. The rotating seat 39 is installed at the lower end of the rotating shaft 36. Several test pens are installed at an annular interval at the lower end of the rotating seat 39.

[0042] The workbench 30 is equipped with several mobile phone screen fixing components, which can fix mobile phone screens 23 of various sizes.

[0043] More specifically, the test pen includes a pen barrel 43, a first magnet 41, a second magnet 42, and a fixing rod 40. The fixing rod 40 has an axial movable hole 44 inside. One end of the pen barrel 43 extends into the movable hole 44. The first magnet 41 is installed on the end of the pen barrel 43 located inside the movable hole 44. The second magnet 42 is installed at the bottom of the movable hole 44. The first magnet 41 and the second magnet 42 are arranged with the same poles repelling each other.

[0044] In the above solution, the test pen, which consists of a pen barrel, magnet one, magnet two, and a fixing rod, can create a certain buffer when pressed down by the repulsive force between magnet one and magnet two, making the test pen make flexible contact with the mobile phone screen and reducing the chance of damage to the mobile phone screen.

[0045] Furthermore, due to installation or usage time, the rotating base may have one side higher than the other. This means that when the mounting block is pressed down, the test pen on the lower side of the rotating base can make normal contact with the phone screen, while the test pen on the higher side cannot. With the above solution, since the pen barrel can move, the pen barrels in this solution can make normal contact with the phone screen for line drawing tests.

[0046] In this embodiment, the drive assembly includes a second motor 31, a lead screw 26, a movable frame 25, and a fixed frame 27. The fixed frame 27 is mounted on the upper surface of the worktable 30, and a guide rail 29 that mates with the movable frame 25 is provided on the fixed frame 27. The test assembly is mounted on the lower end of the movable frame 25. The lead screw 26 is connected to the output end of the second motor 31, and a threaded hole that mates with the lead screw 26 is provided on the movable frame 25. It should be noted that, to improve the smoothness of the mating between the movable frame and the guide rail, rollers 28 are provided at the positions on the movable frame that mate with the guide rail.

[0047] To prevent the mounting block from shifting during its vertical movement, guide blocks 33 are provided on both sides of the mounting block 34. Guide holes are provided on the guide blocks 33, and guide rods 32 are provided in the guide holes. The upper end of the guide rods 32 is connected to the movable frame 25.

[0048] Specifically, the mobile phone screen fixing assembly includes a base plate 2 and a limiting fixing assembly mounted on the base plate 2; the limiting fixing assembly includes a clamping airbag 4 and two L-shaped plates 1, the two L-shaped plates 1 are symmetrically mounted on both sides of the upper surface of the base plate 2, the two L-shaped plates 1 and the base plate 2 form a convex fixing cavity, the clamping airbag 4 is adapted to the shape of the fixing cavity, and the clamping airbag 4 is connected to an external air source.

[0049] By setting up a base plate, two L-shaped plates, and a clamping airbag, when fixing the phone, the external air source is controlled to ventilate the clamping airbag. After the clamping airbag is ventilated, it expands. Due to the limitation of the base plate and the two L-shaped plates, the clamping airbag can only expand in the direction away from the base plate and L-shaped plates, thus achieving simultaneous limitation and fixation of the phone in both horizontal and vertical directions, making fixation more convenient. At the same time, the clamping airbag has a certain buffering effect, which can form a flexible fixation for the phone screen, thereby effectively reducing the chance of damage to the phone screen. Furthermore, because the clamping airbag has a certain deformation capability, this solution can fix phone screens of various widths and thicknesses, and has high versatility.

[0050] In order to make it easier to position the mobile phone screen, a limiting plate is also set on one side of the base plate, which is perpendicular to the two L-shaped plates.

[0051] When fixing the phone screen, first insert the phone screen into the fixing cavity from one side of the base plate until one side of the phone screen contacts the limiting plate. Then, control the external air source to ventilate the clamping airbag. After the clamping airbag is ventilated, it expands. Due to the limiting effect of the base plate and the L-shaped plates on both sides, the clamping airbag can only expand in the direction away from the base plate and L-shaped plates, thus realizing the simultaneous limiting and fixing of the phone in both horizontal and vertical directions, making fixing more convenient. At the same time, the clamping airbag has a certain buffering effect, which can effectively reduce the chance of damage to the phone screen. Furthermore, due to the setting of the clamping airbag, this solution can fix phone screens of various widths and thicknesses, that is, this solution has high versatility.

[0052] The clamping airbag 4 includes a horizontal section and L-shaped limiting sections at both ends of the horizontal section; more specifically, the L-shaped limiting section includes limiting section one 21 and limiting section two 22, and a pleated section 6 is provided at the connection between limiting section one 21 and limiting section two 22, which can be unfolded when inflated.

[0053] In the current technology, curved screen electronic devices capable of displaying images on both the front and sides have become a competitive area among major manufacturers. A curved screen for a mobile phone has four sides with a certain curvature, which makes it difficult to fix the sides of the curved screen securely.

[0054] In this solution, a pleated section 6 is provided at the connection between limiting section 1 21 and limiting section 22. The pleated section 6 can unfold when inflated. Therefore, when fixing the curved screen, a portion of the pleated section can fit well against the two arc-shaped sides of the curved screen, thereby increasing the stability of fixing the mobile phone screen. Furthermore, it should be noted that since this invention uses an airbag for fixing, during fixing, the gas and the surface of the airbag fit against the mobile phone screen. At the same time, the pleated section has a certain degree of extensibility. Therefore, when fixing a normal mobile phone screen, it can also fit against the sides of the mobile phone screen.

[0055] It should be noted that due to different needs, the specifications of mobile phone screens vary. Some mobile phone screens are thicker. If the airbag is supplied with air at the normal air intake, the pressure inside the airbag will increase. Excessive pressure inside the airbag can easily damage the mobile phone screen or cause the airbag to leak and be damaged.

[0056] Therefore, in this embodiment, the limiting and fixing component further includes a pressure relief mechanism, which is used to relieve pressure when the air pressure inside the clamping airbag 4 is too high.

[0057] Specifically, the pressure relief mechanism includes an air outlet pipe 17, a valve seat 3, a piston 18, and a second spring 9. The valve seat 3 has a movable chamber 8, and the piston 18 is movably installed in the movable chamber 8. One end of the air outlet pipe 17 is connected to the clamping airbag 4, and the other end is connected to the movable chamber 8. One end of the second spring 9 is connected to the end of the piston 18 away from the air outlet pipe 17, and the other end is connected to the bottom of the movable chamber 8. The valve seat 3 has a vertical pressure relief hole 7, which is connected to the movable chamber 8. When the air pressure in the clamping airbag 4 is too high, the gas in the clamping airbag 4 squeezes the piston 18, causing the piston 18 to move in the movable chamber 8, and then the gas flows out from the pressure relief hole 7.

[0058] In the above scheme, when designing the second spring, according to the spring force calculation formula F=kx, where: k is the elastic coefficient and x is the deformation, it is only necessary to make the distance from the leftmost end of the movable cavity to the pressure relief hole (the deformation of the spring) multiplied by the spring elastic coefficient K equal to or slightly less than the set maximum pressure.

[0059] In order to improve the sealing performance between the piston and the moving chamber and prevent gas from leaking out from the gap between the piston and the moving chamber, an annular mounting groove is provided on the circumferential surface of the piston 18, and an annular sealing ring 19 is installed in the annular mounting groove. The annular sealing ring can effectively improve the sealing performance between the piston and the moving chamber.

[0060] The valve seat 3 is also provided with a vent pipe 13, and the clamping airbag 4 is provided with an air inlet pipe 16. The end of the air inlet pipe 16 away from the clamping airbag 4 is connected to the vent pipe 13. The vent pipe 13 is provided with a control valve 14. Specifically, an external air source is connected to one end of the vent pipe, and the gas enters the air inlet pipe through the vent pipe and then finally flows into the interior of the clamping airbag.

[0061] In this embodiment, the pressure relief mechanism further includes a transmission assembly. When the piston 18 moves, it drives the transmission assembly to operate, thereby driving the control valve 14 to control the opening and closing of the air intake pipe 16.

[0062] Furthermore, the transmission assembly includes a transmission rack 20 and a transmission gear 11. The valve seat 3 has a mounting cavity 10, which is connected to the movable cavity 8. The transmission rack 20 is horizontally disposed at one end of the piston 18, and the transmission gear 11 is rotatably disposed in the mounting cavity 10. The transmission gear 11 is connected to the control rod of the control valve 14.

[0063] Specifically, the transmission structure of the transmission gear and the control lever is as follows: a first synchronous pulley 12 is coaxially arranged on the transmission gear 11, and a second synchronous pulley 15 is coaxially arranged on the control lever of the control valve 14. The first synchronous pulley 12 and the second synchronous pulley 15 are connected by a synchronous belt 24.

[0064] In this design, because the gas inside the airbag has a certain pressure, the piston will also move to the right during the process of supplying gas to the clamping airbag. In order for the transmission component to drive the control rod to rotate and terminate the gas supply during this process, the piston needs to move to the right a certain distance (the specific distance can be obtained through experiments and calculations) before the transmission gear meshes with the transmission rack.

[0065] It should be noted that in the above scheme, the resistance brought by the transmission component is relatively small, so the impact on the movement of the piston can be ignored.

[0066] When the air pressure inside the clamping airbag is too high, the pressure relief mechanism opens, and gas flows out from the pressure relief hole. If the clamping airbag continues to be inflated at this time, the pressure relief mechanism will continue to open, resulting in gas waste and the clamping airbag being under high pressure continuously, affecting its service life. With the above solution, when the pressure relief mechanism starts, the piston moves to the right, the transmission rack meshes with the transmission gear, the transmission gear rotates, and the synchronous wheel one, which is coaxial with the transmission gear, drives the synchronous wheel two to rotate, which in turn drives the control rod to rotate. The rotation of the control rod then controls the control valve to close, thereby interrupting the gas supply to the clamping airbag.

[0067] The above solution uses the piston to rotate the control rod to close the control valve when the pressure relief valve is opened, thereby interrupting the gas supply to the clamping airbag. It can stop the gas supply while depressurizing, which can prevent the pressure relief mechanism from being continuously opened and thus avoid wasting gas. At the same time, it can also prevent the clamping airbag from being under high pressure for a long time, which will affect its service life.

[0068] The specific structure of the control valve is existing technology. The flow rate of gas passing through the control valve can be controlled by rotating the control lever. Therefore, its specific structure will not be described in detail.

[0069] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A testing device for mobile phone screens of various sizes, comprising a worktable (30); characterized in that: Also include test components; the workbench (30) upper end face is provided with driving assembly, the driving assembly is used for driving the test components moves on the workbench (30); The test components include a cylinder (45), a mounting block (34) and a scribe test mechanism, the mounting block (34) is installed at the lower end of the cylinder (45), and the scribe test mechanism is installed inside the mounting block (34), and the cylinder (45) is used to drive the mounting block (34) to move up and down; The scribe test mechanism includes a motor (35), a rotating seat (39), a limiting plate (37) and a plurality of test pens, the motor (35) and the limiting plate (37) are installed in the mounting block (34), the output end of the motor (35) is connected with a rotating shaft (36), the limiting plate (37) is provided with a bearing (38) matched with the rotating shaft (36), the rotating seat (39) is installed at the lower end of the rotating shaft (36), and the plurality of test pens are annularly and intervally installed at the lower end of the rotating seat (39); A plurality of mobile phone screen fixing assemblies are installed on the workbench (30), and the mobile phone screen fixing assemblies can fix mobile phone screens (23) of various sizes; The mobile phone screen fixing assembly includes a bottom plate (2) and a limiting fixing assembly installed on the bottom plate (2); the limiting fixing assembly includes a clamping air bag (4) and two L-shaped plates (1), the two L-shaped plates (1) are symmetrically installed on the two sides of the upper end face of the bottom plate (2), the two L-shaped plates (1) and the bottom plate (2) form a convex character-shaped fixing cavity, the clamping air bag (4) is matched with the shape of the fixing cavity, and the clamping air bag (4) is in communication with the air source outside; The limiting fixing assembly further includes a pressure relief mechanism, the pressure relief mechanism is used for pressure relief when the air pressure in the clamping air bag (4) is too high; the pressure relief mechanism includes an air outlet pipe (17), a valve seat (3), a piston (18) and a spring (9), the valve seat (3) is provided with a movable cavity (8), the piston (18) is movably installed in the movable cavity (8), one end of the air outlet pipe (17) is connected with the clamping air bag (4), the other end is in communication with the movable cavity (8), one end of the spring (9) is connected with the piston (18) away from the air outlet pipe (17), and the other end is connected with the cavity bottom of the movable cavity (8), the valve seat (3) is provided with a vertical pressure relief hole (7), the pressure relief hole (7) is in communication with the movable cavity (8), when the air pressure in the clamping air bag (4) is too high, the gas in the clamping air bag (4) extrudes the piston (18) to move in the movable cavity (8), and then the gas flows out from the pressure relief hole (7); The valve seat (3) is further provided with an air pipe (13), the clamping air bag (4) is provided with an air inlet pipe (16), one end of the air inlet pipe (16) away from the clamping air bag (4) is in communication with the air pipe (13), and the air pipe (13) is provided with a control valve (14). The pressure relief mechanism further comprises a transmission assembly, the piston (18) drives the transmission assembly to operate when moving, and the transmission assembly drives the control valve (14) to control the opening and closing of the air inlet pipe (16); the transmission assembly comprises a transmission rack (20) and a transmission gear (11), the valve seat (3) is provided with a mounting cavity (10), the mounting cavity (10) is communicated with the movable cavity (8), the transmission rack (20) is horizontally arranged at one end of the piston (18), and the transmission gear (11) is rotatably arranged in the mounting cavity (10); the transmission gear (11) is in transmission connection with the control rod of the control valve (14). The transmission gear (11) is coaxially provided with a synchronous wheel one (12), the control rod of the control valve (14) is coaxially provided with a synchronous wheel two (15), and the synchronous wheel one (12) and the synchronous wheel two (15) are connected through a synchronous belt (24). 2.The device for testing mobile phone screen of multiple sizes according to claim 1, wherein: The test pen comprises a pen barrel (43), a magnet one (41), a magnet two (42) and a fixed rod (40), the fixed rod (40) is internally provided with an axial movable hole (44), one end of the pen barrel (43) extends into the movable hole (44), the magnet one (41) is mounted on the pen barrel (43) at the end in the movable hole (44), and the magnet two (42) is mounted at the hole bottom of the movable hole (44); the magnet one (41) and the magnet two (42) are arranged in the same polarity and repel each other. 3.The device for testing mobile phone screen of multiple sizes according to claim 1, wherein: The driving assembly comprises a motor two (31), a lead screw (26), a movable frame (25) and a fixed frame (27), the fixed frame (27) is mounted on the upper end face of the workbench (30), the fixed frame (27) is provided with a guide rail (29) matched with the movable frame (25), the test assembly is mounted at the lower end of the movable frame (25), the lead screw (26) is connected with the output end of the motor two (31), and the movable frame (25) is provided with a threaded hole matched with the lead screw (26).

4. The mobile phone screen testing device of claim 3, wherein: The two sides of the mounting block (34) are provided with guide blocks (33), the guide blocks (33) are provided with guide holes, the guide holes are provided with guide rods (32), and the upper ends of the guide rods (32) are connected with the movable frame (25).

5. The device for testing the screen of a mobile phone of claim 1, wherein: The clamping air bag (4) comprises a horizontal section and L-shaped limiting sections arranged at both ends of the horizontal section; the L-shaped limiting sections comprise a limiting section one (21) and a limiting section two (22), a wrinkle section (6) is arranged at the connection position of the limiting section one (21) and the limiting section two (22), and the wrinkle section (6) can be unfolded when inflated.

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