Mobile phone protective film strength detection device

Abstract

The invention relates to the technical field of strength detection devices, in particular to a mobile phone protective film strength detection device which comprises a lifting test bench and a circulating loading and unloading assembly, an impact head is mounted on the lifting test bench, and the circulating loading and unloading assembly comprises a base, a pushing module, a cylinder roller, a driving shaft, an intermittent transmission module and an adsorption module. The cylinder roller is rotationally installed at the top end of the base, and the number of the adsorption modules is four. According to the device, through the arrangement of the circulating loading and unloading assembly, when the driving shaft rotates, the intermittent transmission module drives the cylinder roller to rotate intermittently, when the adsorption module rotates to the lower position, materials are adsorbed and then transferred to the upper position, the impact head moves downwards to impact the materials, and the cylinder roller rotates again; and then, the adsorption module on the left side rotates to the lower portion, circulating grabbing and releasing of the materials are completed, and therefore a plurality of materials can be conveniently tested, and the testing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of strength detection devices, in particular to a mobile phone protective film strength detection device. Background Art

[0002] When people use mobile phones, they often use protective films on the phone screen. Among them, tempered film is the most enhanced protective product for protecting the screen. It can completely cover the original screen surface to prevent damage and scratches from external forces. It also increases the impact absorption and will not affect the video effect of the screen. As people use mobile phones more and more frequently, there are more and more types of tempered films.

[0003] The surface of the tempered film is hard enough and scratch-resistant, which reduces the hidden damage of the glass panel and ensures the safety of users. At the same time, it prevents accidental scratches that affect the appearance of the mobile phone. The screen has high light transmittance. The disadvantage is that the film is relatively thick. Due to the hard and brittle characteristics of tempered glass, it is fragile as a whole. Therefore, multiple layers of functional material coatings are coated on the glass surface, such as anti-fouling and explosion-proof. Therefore, in the process of tempered film production and research and development, a large number of strength tests are required on the tempered film. The existing detection devices mostly manually put in and unload the film, and the detection efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to provide a mobile phone protective film strength detection device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A mobile phone protective film strength testing device comprises a lifting test platform and a cyclic loading and unloading component, wherein an impact head is installed on the lifting test platform, and the cyclic loading and unloading component comprises:

[0007] A base, with a drive motor mounted on one end;

[0008] The drum roller is rotatably mounted at the top position of the base;

[0009] There are four adsorption modules, and the four adsorption modules are installed on the drum roller at equal angles in a ring. The adsorption modules are used to adsorb and release materials. The adsorption modules include a main air pipe, a support plate and a piston tube. The main air pipe is fixedly installed on the outside of the drum roller, and the piston tube is fixedly installed on the inner wall of the drum roller. One end of the main air pipe is connected to one end of the piston tube. Two auxiliary pipes are connected to the main air pipe, and one end of the auxiliary pipe is fixedly connected to a suction cup. Both ends of the support plate are fixedly connected to a support seat between the drum roller;

[0010] A driving shaft is rotatably connected to the base, the driving shaft is located in the middle of the drum roller, the output end of the driving motor is transmission-connected to the driving shaft, and when the driving shaft rotates, negative pressure is provided to the suction cup through the piston tube;

[0011] There are two intermittent transmission modules, which are respectively located at the two ends of the drum roller. When the driving shaft rotates continuously, the drum roller is driven to rotate intermittently through the intermittent transmission module;

[0012] The pushing module is located directly below the drum roller and is installed on the base. The pushing module is used to feed the adsorption module.

[0013] Furthermore, both ends of the drum roller are provided with neck portions, and blocks are fixedly connected on both sides of the outer wall of the neck portion, and the intermittent transmission module includes a fixed ring seat, and the neck portion is rotatably connected to the inner wall of the fixed ring seat at the adjacent end, and four annular baffle rods arranged at equal angles are slidably inserted on the fixed ring seat, and a supporting ring seat is provided on one side of the baffle rod, and the bottom ends of the baffle rod and the supporting ring seat are fixedly connected to the base, and the inner wall of the support ring seat is rotatably connected with a ring cylinder, and a wave groove is provided on the outer wall of the ring cylinder, and a torsion spring is fixedly connected between the inner wall of the neck portion and the inner wall of the adjacent ring cylinder, the ring cylinder is transmission-connected to the drive shaft, and one end of the baffle rod is slidably connected to the inner wall of the wave groove.

[0014] Furthermore, the wave groove includes two wave crests and two wave troughs.

[0015] Furthermore, one end of the ring tube is fixedly connected to an inner gear ring, one side of the inner gear ring is provided with an outer gear ring and gear 1, the outer gear ring is fixedly sleeved with the drive shaft, the gear 1 is rotatably installed on the base, one side of the gear 1 is fixedly connected to gear 2, the outer gear ring is meshed with gear 1, the gear 2 is meshed with the inner gear ring, and the outer diameter of gear 2 is smaller than the outer diameter of gear 1.

[0016] Furthermore, the auxiliary pipe is slidably connected with the main air pipe, and a horizontal plate is fixedly connected between the two auxiliary pipes on the same adsorption module, and limiting rings are arranged at both ends of the outer side of the drum roller, and the limiting rings are fixed on the base, and a limiting groove is arranged on one side of the limiting ring, and both ends of the horizontal plate are slidably connected with the adjacent limiting grooves.

[0017] Furthermore, the outer diameters of the upper part and the lower part of the limiting groove are different, and the outer diameter of the lower part of the limiting groove is larger than the outer diameter of the upper part of the limiting groove.

[0018] Furthermore, an extrusion spring is arranged in the piston tube, one end of the extrusion spring is slidably connected to the inner wall of the piston tube, a connecting rod is arranged between the piston tube and the driving shaft, a driving block is arranged at one end of the connecting rod, the other end of the piston tube is fixedly connected to the other end of the connecting rod, an external thread roller is fixedly sleeved in the middle position of the driving shaft, and a thread groove matching the external thread roller is opened on the driving block.

[0019] Furthermore, the driving shaft and the drum roller are in an eccentric state, the axis of the driving shaft is located on the right side of the axis of the drum roller, and the distance between the axis of the driving shaft and the axis of the drum roller is one half to one times the depth of the thread groove on the driving shaft.

[0020] Furthermore, a slider is fixedly connected to one end of the connecting rod, the driving block and the slider are slidably inserted, a return spring is fixedly connected between the driving block and the inner bottom surface of the slider, two sliding rods are arranged between the piston tube and the driving shaft, one end of the sliding rod is fixedly connected to the inner wall of one end of the drum roller, and the slider is slidably sleeved on the sliding rod.

[0021] Furthermore, a compression spring is arranged on the inner wall of the piston tube, one end of the compression spring is fixedly connected to the inner wall of the piston tube, and the other end of the compression spring contacts and compresses the other end of the piston rod.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Through the setting of the cyclic loading and unloading components, when the driving shaft rotates, the intermittent transmission module drives the drum roller to rotate intermittently, so that the drum roller rotates 90 degrees each time, thereby rotating the support plate to the next position. When the adsorption module rotates to the lower position, the material on the top sheet in the pushing module is adsorbed. Then the adsorption module rotates the material to the right, and then rotates again to transfer the material to the upper position. The impact head moves down to impact the material. The drum roller rotates again, and the corresponding adsorption module rotates from the upper side to the left side, and releases the processed material. Then the adsorption module on the left rotates back to the bottom to complete the cyclic grabbing and releasing of the material, so as to facilitate the continuous supply of the material to the bottom of the impact head and withdraw it, so as to facilitate the testing of multiple materials and improve the testing efficiency;

[0024] 2. Through the setting of the intermittent rotation module and the adsorption module, when the adsorption module is located in the lower position, the auxiliary pipe extends downward, so that the suction cup extends downward out of the support plate, thereby facilitating the suction cup to contact and adsorb the material. Subsequently, when the adsorption module rotates from bottom to right, the outer diameter of the upper part of the limit ring is reduced, causing the auxiliary pipe to retract, so that the suction cup drives the material to move toward the support plate, so that the material is squeezed and pressed against the surface of the support plate, so that when the impact head impacts the material, the support plate can receive the material. The setting that the suction cup can extend and retract can avoid interference with the material in the pushing module when the support plate rotates, and at the same time facilitate stable contact with the material for adsorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the cyclic loading and unloading assembly in the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the drum roller in the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the intermittent transmission module in the present invention;

[0029] Figure 5 It is a schematic diagram of the internal structure of the intermittent transmission module in the present invention;

[0030] Figure 6 It is a schematic diagram of the ring tube structure in the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of the limiting ring in the present invention;

[0032] Figure 8 It is a schematic diagram of the piston tube structure in the present invention;

[0033] Fig. 9 It is a schematic diagram of the position of the drive shaft and the adsorption module in the present invention;

[0034] Fig.10 It is a schematic diagram of the internal structure of the piston tube in the present invention.

[0035] In the figure: 100, base; 110, drive motor; 200, pusher module; 300, drum roller; 310, neck portion; 320, clamping block; 400, drive shaft; 410, external thread roller; 500, intermittent transmission module; 510, fixed ring seat; 520, ring cylinder; 521, wave groove; 522, inner gear ring; 530, stop rod; 540, torsion spring; 550, outer gear ring; 551, Gear 1; 552, gear 2; 560, support ring seat; 600, adsorption module; 610, support seat; 620, support plate; 630, main air pipe; 640, auxiliary pipe; 641, cross plate; 650, piston tube; 651, piston rod; 652, extrusion spring; 653, connecting rod; 660, sliding rod; 670, sliding block; 671, driving block; 700, limiting ring; 710, limiting groove. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1 to Figure 7In an embodiment of the present invention, a mobile phone protective film strength detection device includes a lifting test platform and a cyclic loading and unloading assembly. The lifting test platform is equipped with an impact head. The cyclic loading and unloading assembly includes a base 100, a pushing module 200, a drum roller 300, a driving shaft 400, an intermittent transmission module 500 and an adsorption module 600. A driving motor 110 is installed at one end of the base 100. The drum roller 300 is rotatably installed at the top position of the base 100. There are four adsorption modules 600, and the four adsorption modules 600 are annularly installed on the drum roller 300 at equal angles. The adsorption module 600 is used to adsorb and release materials. The adsorption module 600 includes a main air pipe 630, a support plate 620 and a piston tube 650. The main air pipe 630 is fixedly installed on the outer side of the drum roller 300, and the piston tube 650 is fixedly installed on the inner side wall of the drum roller 300. The main air pipe 630 One end of the main air pipe 630 is connected to one end of the piston tube 650, and two auxiliary pipes 640 are connected to the main air pipe 630, and one end of the auxiliary pipe 640 is fixedly connected to a suction cup. Both ends of the support plate 620 are fixedly connected to the drum roller 300 with a support seat 610, the drive shaft 400 is rotatably connected to the base 100, the drive shaft 400 is located in the middle position of the drum roller 300, and the output end of the drive motor 110 is connected to the drive shaft 400. When the drive shaft 400 rotates, negative pressure is provided to the suction cup through the piston tube 650. There are two intermittent transmission modules 500, which are respectively located at the two ends of the drum roller 300. When the drive shaft 400 rotates continuously, the drum roller 300 is driven to rotate intermittently through the intermittent transmission module 500. The pushing module 200 is located directly below the drum roller 300 and is installed on the base 100. The pushing module 200 is used to feed the adsorption module 600.

[0038] Specifically, the stack of materials is placed in the pushing module 200, and the driving motor 110 drives the driving shaft 400 to rotate. When the driving shaft 400 rotates, the intermittent transmission module 500 drives the drum roller 300 to rotate intermittently, so that the drum roller 300 rotates ninety degrees each time, thereby rotating the support plate 620 to the next position. When the adsorption module 600 rotates to the lower position, the top material in the pushing module 200 is adsorbed, and then the adsorption module 600 rotates the material to the right, and then rotates again to transfer the material to the upper position, and the impact head moves down to impact the material. The drum roller 300 rotates again, and the corresponding adsorption module 600 rotates from the upper side to the left side, and releases the processed material. Then the adsorption module 600 on the left rotates to the bottom to complete the cyclic grabbing and releasing of the material, thereby facilitating the continuous supply of material to the bottom of the impact head and withdrawal, thereby facilitating the testing of multiple materials.

[0039] Embodiment 1

[0040] like Figure 3 to Figure 6As shown, in the present embodiment, neck portions 310 are provided at both ends of the drum roller 300, and blocks 320 are fixedly connected to both sides of the outer wall of the neck portion 310, and the intermittent transmission module 500 includes a fixed ring seat 510, and the neck portion 310 is rotatably connected to the inner wall of the fixed ring seat 510 at the adjacent end, and four annular blocking rods 530 arranged at equal angles are slidably inserted on the fixed ring seat 510, and a supporting ring seat 560 is provided on one side of the blocking rod 530, and the bottom ends of the blocking rod 530 and the supporting ring seat 560 are fixedly connected to the base 100, and the inner wall of the supporting ring seat 560 is rotatably connected to a ring cylinder 520, and a wave groove 521 is opened on the outer wall of the ring cylinder 520, and the inner wall of the neck portion 310 is connected to the inner wall of the adjacent ring cylinder 520. A torsion spring 540 is fixedly connected between the walls, the annular tube 520 is transmission-connected to the driving shaft 400, one end of the blocking rod 530 is slidingly connected to the inner wall of the wave groove 521, the wave groove 521 includes two wave crests and two wave troughs, one end of the annular tube 520 is fixedly connected to an inner gear ring 522, one side of the inner gear ring 522 is provided with an outer gear ring 550 and a gear 1 551, the outer gear ring 550 is fixedly sleeved with the driving shaft 400, the gear 1 551 is rotatably mounted on the base 100, one side of the gear 1 551 is fixedly connected to a gear 2 552, the outer gear ring 550 is meshed with the gear 1 551, the gear 2 552 is meshed with the inner gear ring 522, and the outer diameter of the gear 2 552 is smaller than the outer diameter of the gear 1 551.

[0041] In this embodiment, the driving motor 110 drives the driving shaft 400 to rotate forward, and the driving shaft 400 drives the gear 1 551 to rotate in the opposite direction through the outer gear ring 550. The gear 1 551 drives the ring cylinder 520 to rotate in the opposite direction through the gear 2 552 and the inner gear ring 522. When the ring cylinder 520 rotates, it drives the two opposite blocking rods 530 to withdraw, and the other two blocking rods 530 extend. After the withdrawn blocking rods 530 reach a certain distance, the blocking of the block 320 is released, and the ring cylinder 520 drives the drum roller 300 to rotate in the opposite direction through the torsion spring 540. , so that the drum roller 300 rotates ninety degrees in the opposite direction, and the block 320 is blocked by the extended blocking rod 530, so that after the ring drum 520 continues to rotate ninety degrees, the drum roller 300 rotates ninety degrees and then stops under the torsion of the torsion spring 540. The stopping rotation gap of the torsion spring 540 facilitates the impact head to impact the material, and at the same time facilitates the lower suction cup to stably adsorb the material. Through the setting of gear 2 552 and gear 1 551, the driving shaft 400 rotates several times and then drives the ring drum 520 to rotate ninety degrees.

[0042] like Figure 7-Figure 8As shown, in the present embodiment, the auxiliary pipe 640 is slidably connected with the main air pipe 630, and a transverse plate 641 is fixedly connected between the two auxiliary pipes 640 on the same adsorption module 600, and limiting rings 700 are arranged at both ends of the outer side of the drum roller 300, the limiting rings 700 are fixed on the base 100, and a limiting groove 710 is provided on one side of the limiting ring 700, and both ends of the transverse plate 641 are slidably connected with the adjacent limiting grooves 710, and the upper and lower parts of the limiting grooves 710 have different outer diameters, and the outer diameter of the lower part of the limiting groove 710 is larger than the outer diameter of the upper part of the limiting groove 710.

[0043] In specific implementation, when the adsorption module 600 is located in the lower position, the auxiliary tube 640 extends downward, so that the suction cup protrudes downward from the support plate 620, thereby facilitating the suction cup to contact and adsorb the material. Subsequently, when the adsorption module 600 rotates from bottom to right, the outer diameter of the upper part of the limiting ring 700 is reduced, causing the auxiliary tube 640 to retract, so that the suction cup drives the material to move toward the support plate 620, so that the material is squeezed and attached to the surface of the support plate 620, so that when the impact head impacts the material, the support plate 620 receives the material. The setting that the suction cup can extend and retract can avoid interference with the material in the pushing module 200 when the support plate 620 rotates, and at the same time facilitates stable contact with the material for adsorption.

[0044] Embodiment 2

[0045] On the basis of the first embodiment, in order to facilitate the adsorption module 600, the suction cup generates adsorption force when it rotates to the bottom, right, and top, and releases the adsorption when it rotates to the left, so as to achieve the effect of adsorbing and releasing the material.

[0046] like Figure 7 to Figure 10As shown, in this embodiment, an extrusion spring 652 is provided in the piston tube 650, one end of the extrusion spring 652 is slidably connected to the inner wall of the piston tube 650, a connecting rod 653 is provided between the piston tube 650 and the drive shaft 400, one end of the connecting rod 653 is provided with a driving block 671, the other end of the piston tube 650 is fixedly connected to the other end of the connecting rod 653, an externally threaded roller 410 is fixedly sleeved in the middle position of the drive shaft 400, a thread groove matching the externally threaded roller 410 is provided on the driving block 671, the drive shaft 400 is in an eccentric state with the drum roller 300, the axis of the drive shaft 400 is located on the right side of the axis of the drum roller 300, and the axis of the drive shaft 400 is aligned with the drum roller 300. The distance between the axis centers of the rollers 300 is from half to one times the depth of the thread groove on the drive shaft 400. A slider 670 is fixedly connected to one end of the connecting rod 653. The driving block 671 is slidably plugged into the slider 670. A return spring is fixedly connected between the driving block 671 and the inner bottom surface of the slider 670. Two sliding rods 660 are arranged between the piston tube 650 and the drive shaft 400. One end of the sliding rod 660 is fixedly connected to the inner wall of one end of the roller 300. The slider 670 is slidably sleeved with the sliding rod 660. An extrusion spring 652 is arranged on the inner wall of the piston tube 650. One end of the extrusion spring 652 is fixedly connected to the inner wall of the piston tube 650. The other end of the extrusion spring 652 contacts and squeezes the other end of the piston rod 651.

[0047] In specific implementation, through the eccentric setting of the driving shaft 400, when the driving block 671 rotates to the lower, right and upper positions, the driving block 671 is partially engaged or fully engaged with the driving shaft 400. When the driving block 671 rotates to the left, the driving block 671 is disengaged from the driving shaft 400. Therefore, when the driving block 671 is in the lower position, the driving shaft 400 rotates to partially engage with the driving block 671, so that the driving shaft 400 rotates to drive the driving block 671 to move forward, and the driving block 671 drives the piston rod 651 to move forward through the connecting rod 653. The suction cup is evacuated so that negative pressure is formed on the suction cup to adsorb the material, and when the adsorption module 600 rotates from the bottom to the top, the drive shaft 400 continues to rotate and the piston rod 651 continues to move forward, so that negative pressure is continuously provided in the suction cup. Until the adsorption module 600 rotates to the left, the drive block 671 is disengaged from the drive shaft 400, and the piston rod 651 is reset under the action of negative pressure and the elastic force of the extrusion spring 652, so that the negative pressure in the suction cup disappears and the material is released, so that when the adsorption module 600 stays in the lower position, the suction cup continues to generate negative pressure to absorb the material.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mobile phone protective film strength testing device, comprising a lifting test platform and a cyclic loading and unloading component, wherein an impact head is installed on the lifting test platform, characterized in that: The cycle loading and unloading components include: A base, with a drive motor mounted on one end; The drum roller is rotatably mounted at the top position of the base; There are four adsorption modules, and the four adsorption modules are installed on the drum roller at equal angles in a ring. The adsorption modules are used to adsorb and release the materials. The adsorption modules include a main air pipe, a support plate and a piston tube. The main air pipe is fixedly installed on the outside of the drum roller, and the piston tube is fixedly installed on the inner wall of the drum roller. One end of the main air pipe is connected to one end of the piston tube. Two auxiliary pipes are connected to the main air pipe, and one end of the auxiliary pipe is fixedly connected to a suction cup. Both ends of the support plate are fixedly connected to the drum roller with a support seat; The driving shaft is rotatably connected with the base, the driving shaft is located in the middle of the drum roller, the output end of the driving motor is transmission-connected with the driving shaft, and when the driving shaft rotates, negative pressure is provided to the suction cup through the piston tube; There are two intermittent transmission modules, which are located at both ends of the drum roller. When the driving shaft rotates continuously, the drum roller is driven to rotate intermittently through the intermittent transmission module. The pusher module is located directly below the drum roller and installed on the base.

2. A mobile phone protective film strength detection device according to claim 1, characterized in that: Both ends of the drum roller are provided with neck parts, and blocks are fixedly connected on both sides of the outer wall of the neck part. The intermittent transmission module includes a fixed ring seat, and the neck part is rotatably connected to the inner wall of the fixed ring seat at the adjacent end. Four annular baffle rods arranged at equal angles are slidably inserted on the fixed ring seat, and a supporting ring seat is provided on one side of the baffle rod. The bottom ends of the baffle rod and the supporting ring seat are fixedly connected to the base. The inner wall of the support ring seat is rotatably connected with a ring cylinder, and a wave groove is provided on the outer wall of the ring cylinder. A torsion spring is fixedly connected between the inner wall of the neck part and the inner wall of the adjacent ring cylinder. The ring cylinder is transmission-connected to the drive shaft, and one end of the baffle rod is slidably connected to the inner wall of the wave groove.

3. A mobile phone protective film strength detection device according to claim 2, characterized in that: The wave trough includes two wave crests and two wave troughs.

4. A mobile phone protective film strength detection device according to claim 3, characterized in that: One end of the ring cylinder is fixedly connected with an inner gear ring, one side of the inner gear ring is provided with an outer gear ring and gear one, the outer gear ring is fixedly sleeved with the driving shaft, gear one is rotatably installed on the base, one side of gear one is fixedly connected with gear two, the outer gear ring is meshed with gear one, gear two is meshed with the inner gear ring, and the outer diameter of gear two is smaller than the outer diameter of gear one.

5. A mobile phone protective film strength detection device according to claim 1, characterized in that: The auxiliary pipe is slidably connected to the main air pipe, and a horizontal plate is fixedly connected between the two auxiliary pipes on the same adsorption module. Limiting rings are arranged at both ends of the outer side of the drum roller. The limiting rings are fixed on the base. A limiting groove is arranged on one side of the limiting ring. Both ends of the horizontal plate are slidably connected to the adjacent limiting grooves.

6. A mobile phone protective film strength detection device according to claim 5, characterized in that: The outer diameters of the upper part and the lower part of the limiting groove are different, and the outer diameter of the lower part of the limiting groove is greater than the outer diameter of the upper part of the limiting groove.

7. A mobile phone protective film strength detection device according to claim 5, characterized in that: An extrusion spring is arranged in the piston tube, one end of the extrusion spring is slidably connected to the inner wall of the piston tube, a connecting rod is arranged between the piston tube and the driving shaft, a driving block is arranged at one end of the connecting rod, the other end of the piston tube is fixedly connected to the other end of the connecting rod, an external thread roller is fixedly sleeved in the middle position of the driving shaft, and a thread groove matching the external thread roller is opened on the driving block.

8. A mobile phone protective film strength detection device according to claim 7, characterized in that: The drive shaft and the drum roller are in an eccentric state, the axis of the drive shaft is located on the right side of the axis of the drum roller, and the distance between the axis of the drive shaft and the axis of the drum roller is one half to one times the depth of the thread groove on the drive shaft.

9. A mobile phone protective film strength detection device according to claim 7, characterized in that: A slider is fixedly connected to one end of the connecting rod, the driving block and the slider are slidably inserted, a return spring is fixedly connected between the driving block and the inner bottom surface of the slider, two sliding rods are arranged between the piston tube and the driving shaft, one end of the sliding rod is fixedly connected to the inner wall of one end of the drum roller, and the slider is slidably sleeved with the sliding rod.

10. A mobile phone protective film strength detection device according to claim 9, characterized in that: The inner wall of the piston tube is provided with an extrusion spring, one end of the extrusion spring is fixedly connected to the inner wall of the piston tube, and the other end of the extrusion spring contacts and extrudes the other end of the piston rod.

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