CN116170531A

CN116170531A - Mobile phone screen detection device

Info

Publication number: CN116170531A
Application number: CN202310144361.2A
Authority: CN
Inventors: 陈恩松
Original assignee: Jiangxi Kelai Electronics Co ltd
Current assignee: Jiangxi Kelai Electronics Co ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-05-26

Abstract

The invention discloses a mobile phone screen detection device, which comprises a rack, wherein the upper end surface of the rack is provided with a workbench surface; the frame is provided with a rotating frame capable of controlling rotation, and the rotating frame is provided with a scribing assembly; the scribing assembly comprises an electric push rod and a plurality of scribing pens, the scribing pens are arranged at the lower end of the electric push rod, each scribing pen comprises a pen holder, a first magnet, a second magnet and a fixing part, an axial movable hole is formed in the fixing part, the first magnet is arranged at one end, located in the movable hole, of the pen holder, and the second magnet is arranged at the bottom of the movable hole; a plurality of mobile phone screen fixing components are arranged on the working table surface, and the rotating frame drives the scribing pen to conduct scribing test on the mobile phone screen when rotating. According to the invention, the scribing pen consists of the pen holder, the first magnet, the second magnet and the fixing part, and when the scribing pen is pressed down, the repulsive force between the first magnet and the second magnet can form a certain buffer, so that the scribing pen is in flexible contact with the mobile phone screen, and the damage probability of the mobile phone screen is reduced.

Description

Mobile phone screen detection device

Technical Field

The invention relates to the technical field of detection devices, in particular to a mobile phone screen detection device.

Background

The mobile phone screen is also called a display screen and is used for displaying images and colors. The screen material is increasingly common along with the color screen of the mobile phone, and the material of the mobile phone screen is also more and more important. The color screen of a mobile phone is different due to the different LCD quality and development technology. Generally, the more colors that can be displayed, the more complex images can be displayed, and the more the layers of the picture are.

After the mobile phone is produced, the mobile phone screen can be used only by carrying out relevant detection, wherein the mobile phone screen comprises a scribing test, the traditional detection device is used for carrying out scribing operation through a mechanical arm, and when the mobile phone is used for scribing, a scribing pen is firstly controlled to be downwards pressed to be contacted with the mobile phone screen and then to carry out scribing operation, and when the scribing pen is downwards pressed, the scribing pen is directly rigidly contacted with the mobile phone screen, so that the mobile phone screen is easy to damage.

Disclosure of Invention

The invention aims to solve the problems that: the utility model provides a mobile phone screen detection device, through the marking off pen that pen-holder, magnet one, magnet two and fixed part are constituteed, when pushing down, the repulsion between magnet one and the magnet two can form certain buffering for be flexible contact between marking off pen and the mobile phone screen, reduce the probability of mobile phone screen damage.

The technical scheme provided by the invention for solving the problems is as follows: the mobile phone screen detection device comprises a rack, wherein a workbench surface is arranged on the upper end surface of the rack; the machine frame is provided with a rotating frame capable of controlling rotation, and the rotating frame is provided with a scribing assembly;

the scribing assembly comprises an electric push rod and a plurality of scribing pens, the scribing pens are arranged at the lower end of the electric push rod, each scribing pen comprises a pen holder, a first magnet, a second magnet and a fixing part, an axial movable hole is formed in the fixing part, one end of the pen holder extends into the movable hole, the first magnet is arranged at one end of the pen holder, which is positioned in the movable hole, and the second magnet is arranged at the bottom of the movable hole, and homopolar repulsion is arranged between the first magnet and the second magnet;

the mobile phone screen scribing test device is characterized in that a plurality of mobile phone screen fixing components are arranged on the working table surface, and the scribing pen is driven to conduct scribing test on the mobile phone screen when the rotating frame rotates.

Preferably, the lower end of the electric push rod is provided with a mounting block, a containing cavity is arranged in the mounting block, one end of the fixing part is hinged in the containing cavity, two springs I are symmetrically arranged on two sides of the fixing part, and one end of each spring I, far away from the fixing part, is connected with a wall of the containing cavity; the first spring is used for providing rebound force when the fixed part rotates.

Preferably, guide blocks are arranged on two sides of the installation block, guide holes are formed in the guide blocks, guide rods are arranged in the guide holes, and the upper ends of the guide rods are connected with the rotating frame.

Preferably, the mobile phone screen fixing assembly comprises a bottom plate and a limiting fixing assembly arranged on the bottom plate; the limiting and fixing assembly comprises a clamping air bag and two L-shaped plates, the two L-shaped plates are symmetrically arranged on two sides of the upper end face of the bottom plate, the two L-shaped plates and the bottom plate form a convex-shaped fixing cavity, the clamping air bag is matched with the shape of the fixing cavity, and the clamping air bag is communicated with an external air source.

Preferably, the clamping air bag comprises a horizontal section and L-shaped limiting sections arranged at two ends of the horizontal section; the L-shaped limiting section comprises a first limiting section and a second limiting section, a fold section is arranged at the joint of the first limiting section and the second limiting section, and the fold section can be unfolded when inflated.

Preferably, the limiting and fixing assembly further comprises a pressure relief mechanism, wherein the pressure relief mechanism is used for relieving pressure when the air pressure in the clamping air bag is too high; the pressure relief mechanism comprises an air outlet pipe, a valve seat, a piston and a second spring, wherein a movable cavity is arranged in the valve seat, the piston is movably arranged in the movable cavity, one end of the air outlet pipe is connected with a clamping air bag, the other end of the air outlet pipe is communicated with the movable cavity, one end of the second spring is connected with one end of the piston, which is far away from the air outlet pipe, the other end of the second spring is connected with the cavity bottom of the movable cavity, a vertical pressure relief hole is formed in the valve seat, the pressure relief hole is communicated with the movable cavity, when the air pressure in the clamping air bag is too high, the piston is extruded by air in the clamping air bag to enable the piston to move in the movable cavity, and then the air flows out of the pressure relief hole.

Preferably, a vent pipe is further arranged in the valve seat, an air inlet pipe is arranged on the clamping air bag, one end, away from the clamping air bag, of the air inlet pipe is communicated with the vent pipe, and a control valve is arranged on the vent pipe.

Preferably, the pressure release mechanism further comprises a transmission assembly, and the piston drives the transmission assembly to operate when moving so as to drive the control valve to control the on-off of the air inlet pipe.

Preferably, the transmission assembly comprises a transmission rack and a transmission gear, an installation cavity is arranged in the valve seat and communicated with the movable cavity, the transmission rack is horizontally arranged at one end of the piston, the transmission gear is rotatably arranged in the installation cavity, and the transmission gear is in transmission connection with a control rod of the control valve.

Preferably, the transmission gear is coaxially provided with a first synchronizing wheel, the control rod of the control valve is coaxially provided with a second synchronizing wheel, and the first synchronizing wheel is connected with the second synchronizing wheel through a synchronous belt.

Compared with the prior art, the invention has the advantages that: according to the invention, the scribing pen consists of the pen holder, the first magnet, the second magnet and the fixing part, and when the scribing pen is pressed down, the repulsive force between the first magnet and the second magnet can form a certain buffer, so that the scribing pen is in flexible contact with the mobile phone screen, and the damage probability of the mobile phone screen is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.

FIG. 1 is a front view of the present invention;

FIG. 2 is a top view of the invention with the swivel mount removed;

FIG. 3 is an enlarged schematic view of the present invention at A in FIG. 1;

fig. 4 is a cross-sectional view of the mounting block and the scribing pen.

FIG. 5 is a front view of a mobile phone screen securing assembly of the present invention;

FIG. 6 is a top view of a mobile phone screen securing assembly of the present invention;

FIG. 7 is a cross-sectional view of the pressure relief mechanism of the present invention;

FIG. 8 is a cross-sectional view of the pressure relief mechanism of the present invention when the pressure relief mechanism is depressurized;

FIG. 9 is an enlarged schematic view at A in FIG. 5;

fig. 10 is a schematic diagram of the present invention when the mobile phone screen is fixed.

The drawings are marked: 1. the device comprises an L-shaped plate, 2, a bottom plate, 3, a valve seat, 4, a clamping airbag, 5, a limiting plate, 6, a fold section, 7, a pressure relief hole, 8, a movable cavity, 9, a second spring, 10, a mounting cavity, 11, a transmission gear, 12, a first synchronizing wheel, 13, a vent pipe, 14, a control valve, 15, a second synchronizing wheel, 16, an air inlet pipe, 17, an air outlet pipe, 18, a piston, 19, an annular sealing ring, 20, a transmission rack, 21, a first limiting section, 22, a second limiting section, 23, a mobile phone screen, 24, a synchronous belt, 25, a rack, 26, a rotating frame, 27, a containing cavity, 28, a motor, 29, a working table, 30, an electric push rod, 31, a guide rod, 32, a guide block, 33, a mounting block, 34, a fixing part, 35, a pen holder, 36, a magnet, 37, a magnet, 38, a movable hole, 39 and a first spring.

Detailed Description

The following detailed description of embodiments of the present invention will be given with reference to the accompanying drawings and examples, by which the implementation process of how the present invention can be applied to solve the technical problems and achieve the technical effects can be fully understood and implemented.

In the description of the present invention, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present invention that the device or element referred to must have a specific azimuth configuration and operation.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first", "a second" or "a second" feature may explicitly or implicitly include one or more such feature, and in the description of the invention, the meaning of "a number" is two or more, unless otherwise specifically defined.

In the present invention, unless explicitly stated and limited otherwise, the terms "assembled," "connected," and "connected" are to be construed broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; can be directly connected or connected through an intermediate medium, and can be communicated with the inside of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention. As used in the specification of the embodiments of the invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The invention relates to a mobile phone screen detection device, which is shown in the accompanying drawings, and comprises a rack 25, wherein a workbench surface 29 is arranged on the upper end surface of the rack 25; a rotating frame 26 capable of controlling rotation is arranged on the frame 25, and a scribing assembly is arranged on the rotating frame 26;

the scribing assembly comprises an electric push rod 30 and a plurality of scribing pens, the scribing pens are arranged at the lower end of the electric push rod 30, each scribing pen comprises a pen holder 35, a first magnet 36, a second magnet 37 and a fixed part 34, an axial movable hole 38 is formed in the fixed part 34, one end of the pen holder 35 stretches into the movable hole 38, the first magnet 36 is arranged at one end of the pen holder 35, which is positioned in the movable hole 38, the second magnet 37 is arranged at the bottom of the movable hole 38, and the first magnet 36 and the second magnet 37 are arranged in a homopolar repulsion manner;

the workbench surface 29 is provided with a plurality of mobile phone screen 23 fixing components, and the rotating frame 26 drives the scribing pen to scribe on the mobile phone screen 23 when rotating.

Wherein, further, a mounting block 33 is arranged at the lower end of the electric push rod 30, a containing cavity 27 is arranged in the mounting block 33, one end of the fixing part 34 is hinged in the containing cavity 27, two springs 39 are symmetrically arranged at two sides of the fixing part 34, and one end of the spring 39 far away from the fixing part 34 is connected with the wall of the containing cavity 27; the first spring 39 is used to provide a rebound force when the fixing portion 34 rotates.

When the mobile phone screen is fixed, the mobile phone screen is possibly fixed to be uneven due to the clamp or the problem of staff, namely, the situation that one side is high and the other side is low appears, the scribing pen is easy to damage one side of the mobile phone screen when scribing is performed on the mobile phone screen in a back-and-forth mode, through the technical scheme, when the mobile phone screen is scribed, if the mobile phone screen is uneven, the scribing pen can compress the spring to be in an inclined state when the mobile phone screen is scribed on the side higher than the mobile phone screen, and damage to the mobile phone screen can be effectively prevented.

Wherein, in order to prevent that the installation piece from deviating in the in-process of up-and-down motion from taking place the both sides of installation piece 33 are provided with guide block 32, be provided with the guiding hole on the guide block 32, be provided with guide bar 31 in the guiding hole, the upper end and the swivel mount 26 of guide bar 31 are connected, realize the direction to the installation piece operation through the cooperation between guide bar and the guide block.

Specifically, the mobile phone screen fixing assembly comprises a bottom plate 2 and a limiting fixing assembly arranged on the bottom plate 2; the limiting and fixing assembly comprises a clamping air bag 4 and two L-shaped plates 1, wherein the two L-shaped plates 1 are symmetrically arranged on 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-shaped fixing cavity, the clamping air bag 4 is matched with the fixing cavity in shape, and the clamping air bag 4 is communicated with an external air source.

Through setting up bottom plate, two L shaped plates and clamping gasbag, when fixed cell-phone, the external air supply of control is ventilated the clamping gasbag, and the clamping gasbag is inflated after ventilating, because the spacing of bottom plate and both sides L shaped plate for the clamping gasbag can only be in the direction inflation that deviates from bottom plate and L shaped plate, thereby realized that mobile phone level and two vertical directions are spacing fixed simultaneously, it is more convenient to fix, the clamping gasbag has certain cushioning effect simultaneously, can form flexible fixation to the mobile phone screen, thereby the effectual probability that reduces the mobile phone screen and damage, and, because the clamping gasbag has certain deformability, make this scheme can fix the mobile phone screen of multiple width and thickness, have higher universal performance.

Wherein, in order to more conveniently fix a position the mobile phone screen, still be provided with the limiting plate in one side of bottom plate, the limiting plate is perpendicular with two L shaped plates.

When fixed mobile phone screen, first pack into fixed intracavity with mobile phone screen from one side of bottom plate, until one side and limiting plate contact of mobile phone screen, then control external air supply and ventilate the clamping gasbag, the clamping gasbag is inflated after ventilating, because the spacing of bottom plate and both sides L shaped plate for the clamping gasbag can only be in the direction inflation that deviates from bottom plate and L shaped plate, thereby it is fixed to have realized simultaneously that mobile phone level and vertical two directions carry out spacing, it is more convenient to fix, the clamping gasbag has certain cushioning effect simultaneously, can effectually reduce the probability that mobile phone screen damaged, and, because the setting of clamping gasbag, make this scheme can fix the mobile phone screen of multiple width and thickness, this scheme has higher universal performance promptly.

As shown in fig. 5 and fig. 9, the clamping airbag 4 includes a horizontal section and L-shaped limiting sections disposed at two ends of the horizontal section; more specifically, the L-shaped limiting section comprises a first limiting section 21 and a second limiting section 22, a fold section 6 is arranged at the joint of the first limiting section 21 and the second limiting section 22, and the fold section 6 can be unfolded when inflated.

In the prior art, curved screen electronic devices capable of displaying pictures on both the front and side surfaces of the electronic device are competing fields of various manufacturers. The curved surface screen of the mobile phone, namely, the four sides of the screen of the mobile phone have a certain radian transition, so that the sides of the curved surface screen are not easy to fix.

In the scheme, the fold section 6 is arranged at the joint of the first limit section 21 and the second limit section 22, and the fold section 6 can be unfolded when being inflated, so that when the curved screen is fixed, one part of the fold section can be well attached to two arc-shaped side edges of the curved screen, and the stability of fixing the mobile phone screen is improved; in addition, the invention adopts the air bag mode to fix, when the air bag is fixed, the surface of the air bag is pressed by the air and is attached to the mobile phone screen, and meanwhile, the fold section has certain ductility, so that the air bag can be attached to the side edge of the mobile phone screen when the normal mobile phone screen is fixed.

It should be noted that, because of different requirements, the specifications of the mobile phone screens are different, some mobile phone screens are thicker, if the air is conveyed to the clamping air bag according to the normal air inflow, the pressure in the air bag is increased, and if the pressure in the air bag is too large, the mobile phone screens are crushed or the clamping air bag is damaged by air leakage.

Therefore, in this embodiment, the limiting fixing assembly further includes a pressure release mechanism, and the pressure release mechanism is used for releasing pressure when the air pressure in the clamping air bag 4 is too high.

Specifically, relief mechanism includes outlet duct 17, disk seat 3, piston 18 and spring two 9, be equipped with movable chamber 8 in the disk seat 3, piston 18 movable mounting is in movable chamber 8, outlet duct 17 one end is connected with clamping gasbag 4, and the other end communicates with movable chamber 8, spring two 9 one end is connected with piston 18 one end of keeping away from outlet duct 17, and the other end is connected with the chamber bottom of movable chamber 8, be equipped with vertical relief hole 7 on the disk seat 3, relief hole 7 communicates with movable chamber 8, and when the internal atmospheric pressure of clamping gasbag 4 was too high, gas extrusion piston 18 in clamping gasbag 4 made piston 18 move in movable chamber 8, then gaseous outflow from the relief hole 7.

In the above scheme, when the second spring is specifically designed, the formula f=kx is calculated according to the spring force of the second spring, where: k is an elastic coefficient, x is a deformation amount, and the distance from the leftmost end of the movable cavity to the pressure relief hole (deformation amount of the spring) is only required to be multiplied by the elastic coefficient K of the spring to be equal to or slightly smaller than the set maximum pressure.

In order to improve the sealing performance between the piston and the movable cavity, gas is prevented from leaking from a gap between the piston and the movable cavity, an annular mounting groove is formed in the circumferential surface of the piston 18, an annular sealing ring 19 is arranged in the annular mounting groove, and the sealing performance between the piston and the movable cavity can be effectively improved through the annular sealing ring.

The valve seat 3 is internally provided with a vent pipe 13, the clamping airbag 4 is provided with an air inlet pipe 16, one end of the air inlet pipe 16, far away from the clamping airbag 4, is communicated with the vent pipe 13, the vent pipe 13 is provided with a control valve 14, a specific external air source is communicated with one end of the vent pipe, and air enters the air inlet pipe through the vent pipe and finally flows into the clamping airbag.

In this embodiment, the pressure release mechanism further includes a transmission assembly, and the piston 18 drives the transmission assembly to operate when moving, so as to drive the control valve 14 to control the on-off of the air inlet pipe 16.

Still further, the drive assembly includes drive rack 20, drive gear 11, be equipped with installation cavity 10 in the disk seat 3, installation cavity 10 and activity chamber 8 intercommunication, drive rack 20 level sets up in the one end of piston 18, and drive gear 11 rotates the setting in installation cavity 10, drive gear 11 is connected with the control lever transmission of control valve 14.

Specifically, the specific transmission structure of the transmission gear and the control rod is as follows: the transmission gear 11 is coaxially provided with a first synchronizing wheel 12, the control rod of the control valve 14 is coaxially provided with a second synchronizing wheel 15, and the first synchronizing wheel 12 is connected with the second synchronizing wheel 15 through a synchronous belt 24.

The piston can move rightwards in the process of air conveying the clamping air bag due to certain pressure of air in the air bag, and the transmission assembly drives the control rod to rotate to cause the air conveying terminal in the process, so that in the scheme, the piston needs to move rightwards by a certain distance (the distance can be calculated according to experiments) and then the transmission gear is meshed with the transmission rack.

It should be noted that, in the above solution, the resistance caused by the transmission assembly is relatively small, so the influence on the movement of the piston is negligible.

When the air pressure in the clamping air bag is overlarge, the pressure release mechanism is opened, air flows out from the pressure release hole, if the clamping air bag is inflated continuously at the moment, the pressure release mechanism can be opened continuously, the air waste is caused, the clamping air bag is still easy to be caused to be continuously under higher air pressure, the service life is influenced, by the scheme, when the pressure release mechanism starts, the piston moves to the right, the transmission rack is meshed with the transmission gear, the transmission gear rotates, the synchronous wheel coaxially arranged with the transmission gear drives the synchronous wheel II to rotate, the control rod is driven to rotate, the control rod rotates to further control the control valve to be closed, and accordingly the air transmission to the clamping air bag is interrupted.

Above-mentioned scheme drives the control lever and rotates when opening through the relief valve and close the control valve to break the gas transmission to clamping gasbag, can close the gas transmission when the pressure release, can prevent to lead to pressure release mechanism to open continuously, can not cause gaseous waste simultaneously, can also prevent simultaneously that clamping gasbag from continuously being in under higher atmospheric pressure influence life.

The specific structure of the control valve belongs to the prior art, and the control rod can control the flow of the gas passing through the control valve by rotating, so that the specific structure is not repeated.

The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The mobile phone screen detection device comprises a rack (25), wherein a workbench surface (29) is arranged on the upper end surface of the rack (25); the method is characterized in that: a rotatable frame (26) capable of controlling rotation is arranged on the stand (25), and a scribing assembly is arranged on the rotatable frame (26);

the scribing assembly comprises an electric push rod (30) and a plurality of scribing pens, the scribing pens are arranged at the lower end of the electric push rod (30), each scribing pen comprises a pen holder (35), a first magnet (36), a second magnet (37) and a fixing portion (34), an axial movable hole (38) is formed in each fixing portion (34), one end of each pen holder (35) stretches into each movable hole (38), the first magnet (36) is arranged at one end, located in each movable hole (38), of each pen holder (35), the second magnet (37) is arranged at the bottom of each movable hole (38), and the first magnets (36) and the second magnets (37) are arranged in a homopolar repulsion mode;

the mobile phone screen scribing test device is characterized in that a plurality of mobile phone screen fixing assemblies are arranged on the workbench surface (29), and the scribing pen is driven to conduct scribing test on the mobile phone screen (23) when the rotating frame (26) rotates.

2. The mobile phone screen detection device according to claim 1, wherein: the electric push rod is characterized in that a mounting block (33) is arranged at the lower end of the electric push rod (30), a containing cavity (27) is arranged in the mounting block (33), one end of the fixing part (34) is hinged in the containing cavity (27), two springs I (39) are symmetrically arranged on two sides of the fixing part (34), and one end, far away from the fixing part (34), of each spring I (39) is connected with a wall of the containing cavity (27); the first spring (39) is used for providing rebound force when the fixed part (34) rotates.

3. The mobile phone screen detection device according to claim 2, wherein: guide blocks (32) are arranged on two sides of the mounting block (33), guide holes are formed in the guide blocks (32), guide rods (31) are arranged in the guide holes, and the upper ends of the guide rods (31) are connected with the rotating frame (26).

4. The mobile phone screen detection device according to claim 1, wherein: the mobile phone screen fixing assembly comprises a bottom plate (2) and a limiting fixing assembly arranged on the bottom plate (2); the limiting and fixing assembly comprises a clamping air bag (4) and two L-shaped plates (1), wherein the two L-shaped plates (1) are symmetrically arranged on 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-shaped fixing cavity, the clamping air bag (4) is matched with the shape of the fixing cavity, and the clamping air bag (4) is communicated with an external air source.

5. The mobile phone screen detection device according to claim 4, wherein: the clamping air bag (4) comprises a horizontal section and L-shaped limiting sections arranged at two ends of the horizontal section; the L-shaped limiting section comprises a first limiting section (21) and a second limiting section (22), wherein a fold section (6) is arranged at the joint of the first limiting section (21) and the second limiting section (22), and the fold section (6) can be unfolded when inflated.

6. The mobile phone screen detection device according to claim 4, wherein: the limiting and fixing assembly further comprises a pressure relief mechanism, wherein the pressure relief mechanism is used for relieving pressure when the air pressure in the clamping air bag (4) is too high; the pressure relief mechanism comprises an air outlet pipe (17), a valve seat (3), a piston (18) and a second spring (9), wherein a movable cavity (8) is formed in the valve seat (3), the piston (18) is movably installed in the movable cavity (8), one end of the air outlet pipe (17) is connected with a clamping air bag (4), the other end of the air outlet pipe is communicated with the movable cavity (8), one end of the second spring (9) is connected with one end of the piston (18) away from the air outlet pipe (17), the other end of the second spring is connected with the cavity bottom of the movable cavity (8), a vertical pressure relief hole (7) is formed in the valve seat (3), the pressure relief hole (7) is communicated with the movable cavity (8), and when the air pressure in the clamping air bag (4) is too high, the piston (18) is extruded by air in the clamping air bag (4) to enable the piston (18) to move in the movable cavity (8), and then air flows out of the pressure relief hole (7).

7. The mobile phone screen detection device according to claim 6, wherein: still be equipped with breather pipe (13) in disk seat (3), be provided with intake pipe (16) on clamping gasbag (4), the one end and breather pipe (13) intercommunication of clamping gasbag (4) are kept away from to intake pipe (16), be provided with control valve (14) on breather pipe (13).

8. The mobile phone screen detection device according to claim 7, wherein: the pressure release mechanism further comprises a transmission assembly, and the piston (18) drives the transmission assembly to operate when moving so as to drive the control valve (14) to control the on-off of the air inlet pipe (16).

9. The mobile phone screen detection device according to claim 8, wherein: the transmission assembly comprises a transmission rack (20) and a transmission gear (11), a mounting cavity (10) is formed in the valve seat (3), 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), the transmission gear (11) is rotatably arranged in the mounting cavity (10), and the transmission gear (11) is in transmission connection with a control rod of the control valve (14).

10. The mobile phone screen detection device according to claim 9, wherein: the transmission gear (11) is coaxially provided with a first synchronizing wheel (12), the control rod of the control valve (14) is coaxially provided with a second synchronizing wheel (15), and the first synchronizing wheel (12) is connected with the second synchronizing wheel (15) through a synchronous belt (24).