Automatic film coating machine for mobile phone middle frame

Abstract

The invention discloses a mobile phone middle frame automatic film coating machine, and relates to the technical field, the mobile phone middle frame automatic film coating machine comprises a placing disc and a middle frame piece placed on the placing disc, a battery cell needing film coating is integrally arranged on the middle frame piece, a film pressing piece is arranged above the placing disc, and the film pressing piece comprises a hot pressing ring for pressing a film body and an auxiliary pressing strip; one end of the auxiliary pressing strip is inserted below the hot pressing ring and the film body, the film pressing piece further comprises a cutter for trimming the film body, and the film body wrapping the outer side of the battery cell is torn down by pulling the auxiliary pressing strip, so that the film tearing convenience is improved; in the film coating process, the deformed auxiliary pressing strip serves as an exhaust channel to be used for exhausting gas in a film, the film body is prevented from expanding and breaking due to excessive air in the film in the film coating process, the film is prevented from losing efficacy, and the film body is prevented from falling off due to the fact that a hot-pressing part is prone to losing efficacy due to excessive air in the film and extrusion in the conveying process.

Description

Technical Field

[0001] The present invention relates to the technical field of battery core coating, and in particular to an automatic coating machine for a mobile phone middle frame. Background Art

[0002] The battery cell integrated mobile phone middle frame combines the battery cell with the mobile phone middle frame to reduce the later assembly procedures. The integrated design enables the mobile phone middle frame to protect the battery cell before assembly.

[0003] Before the overall assembly, a film needs to be affixed to the surface of the battery cell to cover the sensitive parts of the battery cell. Protective materials can be used to cover it to prevent damage from static electricity or external forces, and to prevent scratches on the battery cell before assembly. When the mobile phone components need to be assembled later, the protective film can be torn off and assembled again.

[0004] During the film pasting process, the film is pressed onto the middle frame outside the battery cell by hot pressing. In the process of pressing the film down, the film is expanded and pressed on the outside of the battery cell, resulting in air between the film and the battery cell, and the overall covering film pressing causes the air between the film and the battery cell to be unable to be discharged. When there is too much air in the film during the filming process, the film will cause it to expand and rupture, resulting in film failure. When the internal air-type film expands, it is easy to cause failure of the hot pressing part when it is squeezed during the transportation of the mobile phone middle frame, causing the film to fall off. Summary of the invention

[0005] The purpose of the present invention is to provide an automated film coating machine for a mobile phone middle frame, which has an auxiliary pressure strip that is deformed during the film coating process and serves as an exhaust channel for exhausting the gas inside the film coating, thereby preventing excessive air in the film during the film coating process from causing the film body to expand and rupture, resulting in film failure. It also avoids excessive air inside the film, which may cause extrusion during transportation and easily lead to failure of the hot pressing part, resulting in the film falling off.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic film coating machine for a mobile phone middle frame, comprising a placing tray and a middle frame member placed on the placing tray, a battery cell to be coated is integrally arranged on the middle frame member, a film pressing member is arranged above the placing tray, the film pressing member comprises a hot pressing ring for pressing a film body, and an auxiliary pressure strip, one end of the auxiliary pressure strip is inserted and arranged below the hot pressing ring and the film body, the film pressing member also comprises a tool for trimming the film body, the hot pressing ring presses down to press the film body onto the middle frame member, and the film body is coated on the outside of the battery cell, and a pressure rod for assisting the deformation of the pressure strip is also arranged above the auxiliary pressure strip; The heat pressing ring is used to press the film body onto the outside of the battery cell, forming a wrapping space between the film body and the battery cell. One end of the auxiliary pressure strip is pressed into the wrapping space between the film body and the middle frame. When the heat pressing ring is pressed down, the pressure rod squeezes the auxiliary pressure strip into a U shape to form an arc-shaped channel. The arc-shaped channel is used as an exhaust channel for the wrapping space to communicate with the outside space.

[0007] Furthermore, the die pressing part also includes a conical pressing platform, a hot pressing ring is arranged below the conical pressing platform, a tool is arranged on the conical pressing platform, and the top of the conical pressing platform is connected to the output end of the driver, and the driver drives the conical pressing platform to press downward.

[0008] Furthermore, a rotating member is installed on the conical pressing platform, and the rotating member is connected to the tool. The rotating member can drive the tool to rotate to cut the film body after hot pressing.

[0009] Furthermore, the tool is arranged in an oblique shape, and the inclination angle of the tool matches the inclined surface of the conical pressing platform.

[0010] Furthermore, an auxiliary rod is provided at the side end of the conical pressing platform, and a plurality of placement plates are arranged in a circular array on the outer wall of the auxiliary rod, each placement plate is provided with a placement groove, and an auxiliary press strip is placed in the placement groove.

[0011] Furthermore, auxiliary pressure strips are arranged in the placement grooves, and the pressure rods are arranged in the placement grooves and above the auxiliary pressure strips.

[0012] Furthermore, an extrusion groove is opened on the outer wall of the auxiliary rod, one end of the placement plate is arranged in the extrusion groove through a bent plate, and the lower part of the bent plate is connected to the inner plate of the extrusion groove through a spring.

[0013] Furthermore, the outer wall of the auxiliary rod is connected to an extrusion ring through a bearing, the extrusion ring is connected to the output end of the driver through a connecting rod, an inner pressure plate is provided on the inner wall of the extrusion ring, a movable groove is provided on the outer wall of the bearing, the inner pressure plate is provided in the movable groove, the upper end of the auxiliary rod is connected to the motor, and when the auxiliary rod rotates, the extrusion grooves on its surface are aligned with the movable groove in turn, and when one of the extrusion grooves is aligned with the movable groove, the inner pressure plate moves downward in the movable groove and the extrusion groove to extrude the bent plate in the extrusion groove.

[0014] Furthermore, the placing plate is hingedly mounted with a first pressure plate and a second pressure plate, the two ends of the first pressure plate are end a and end b respectively, the two ends of the second pressure plate are end c and end d, the end a of the first pressure plate is in contact with the upper end surface of the pressure rod, the end b of the first pressure plate is arranged above the end c of the second pressure plate, and an outer pressure plate is arranged on the outer wall of the extrusion ring, and the outer pressure plate is arranged above the end d of the second pressure plate.

[0015] Furthermore, the battery cells of the middle frame are base paper made of nano-scale cellulose, carbon nanotubes are embedded in the base paper, and the outer side of the base paper is covered with a layer of solidified charged polystyrene plastic solution.

[0016] Technical effects and advantages of the present invention: 1. The pressure rod of the present invention squeezes the auxiliary pressure strip into a U shape to form an arcuate channel, and the arcuate channel is used as an exhaust channel for the wrapped space to communicate with the external space. The auxiliary pressure strip is deformed into a U shape, and one end of the U-shape of the auxiliary pressure strip is arranged under the film body. When the film is pressed, the U-shaped film body is used to press and exhaust at the same time. During the film pressing process, the auxiliary pressure strip serves as an exhaust structure. When the film pressing is completed, the auxiliary pressure strip can also be used as an auxiliary tearing strip. By pulling the auxiliary pressure strip, the film body wrapped on the outside of the battery cell is torn off, thereby improving the convenience of film tearing. During the film wrapping process, the deformed auxiliary pressure strip is used as an exhaust channel for exhausting the gas inside the film wrapping, so as to prevent the film body from expanding and rupturing due to excessive air in the film during the film wrapping process, thereby preventing the film body from failing due to expansion and rupture, thereby preventing the film from failing. It also avoids excessive air inside the film, which may cause failure of the hot pressing part due to extrusion during transportation, thereby causing the film body to fall off.

[0017] 2. In the present invention, while the end b of the first pressure plate is lifted, the end a of the first pressure plate is pressed down, and then the pressure rod is squeezed to drive the auxiliary pressure strip to deform. This embodiment utilizes the power of the film pressing member pressing down to achieve the auxiliary pressure strip alignment, and can also drive the pressure rod to press down to deform the auxiliary pressure strip, thereby reducing the driving cost. The auxiliary pressure strip alignment is achieved by utilizing the power of the film pressing member pressing down, and the downward pressure of a single placement plate does not affect the discharge of other placement plates, thereby improving the convenience of discharge. Without affecting the discharge of materials, a single placement plate can be driven downward without restriction to align the auxiliary pressure strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the separation structure of the film pressing part and the middle frame part of the present invention; Figure 3 It is a bottom view of the structure of the film pressing member of the present invention; Figure 4 This is a schematic diagram of the undeformed structure of the auxiliary layering strip of the present invention; Figure 5 It is a schematic diagram of the deformation structure of the auxiliary pressure strip of the present invention; Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the structure of the film pressing member and the placement plate according to the second embodiment of the present invention; Figure 8 It is a schematic diagram of the placement plate structure of the present invention; Fig. 9A half-section diagram of the auxiliary rod structure of the present invention; Fig.10 For the present invention Fig. 9 A magnified image of point A; Fig.11 For the present invention Fig. 9 Enlarged view of point B.

[0019] In the figure: 1. Placement plate; 2. Middle frame; 21. Battery cell; 3. Film pressing part; 31. Hot pressing ring; 32. Auxiliary pressing strip; 321. Pressing rod; 33. Cutting tool; 34. Conical pressing table; 341. Rotating part; 35. Driver; 5. Auxiliary rod; 51. Placement plate; 511. Placement groove; 512. Bending plate; 513. First pressing plate; 514. Second pressing plate; 52. Extrusion groove; 53. Extrusion ring; 531. Inner pressing plate; 532. Outer pressing plate. DETAILED DESCRIPTION

[0020] 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.

[0021] In order to better understand the automatic film coating machine for the mobile phone middle frame provided by the present embodiment, the existing film coating equipment is briefly introduced below. The existing film coating equipment is arranged in the process of coating the battery cell, and the film is directly pressed to expand the film body and coat the outside of the battery cell. After the coating is completed, it is necessary to perform a secondary patch on the outside of the film body, and paste the auxiliary patch on the film coating. When the mobile phone middle frame with the battery cell needs to be assembled, the film coating needs to be torn off. At this time, the film coating is torn off by pulling the auxiliary patch. However, the above method does not take into account the subsequent needs of the mobile phone middle frame before assembly. The transportation and storage require extrusion problems, and the laminating and sticking processes are handled separately, which increases the complexity of processing. The specification aims to solve the above technical problems. The embodiment of the present application provides an automatic film coating machine for a mobile phone middle frame. The auxiliary pressure strip 32 is deformed during the film coating. The deformed auxiliary pressure strip 32 is used as an exhaust channel for exhausting the gas inside the film during the film coating process to prevent the film from expanding and rupturing due to excessive air in the film during the film coating process, resulting in film failure. It also avoids excessive air inside the film, which may cause failure of the hot pressing part due to extrusion during transportation, resulting in film falling off.

[0022] Example 1: Reference Figure 1 - Figure 5, which is the first embodiment of the present invention, provides an automatic film coating machine for a mobile phone middle frame, including a placement tray 1 and a middle frame member 2 placed on the placement tray 1, a battery cell 21 to be coated is integrally arranged on the middle frame member 2, a film pressing member 3 is arranged above the placement tray 1, the film pressing member 3 includes a hot pressing ring 31 for pressing a film body, and an auxiliary pressure strip 32, one end of the auxiliary pressure strip 32 is inserted and arranged below the hot pressing ring 31 and the film body, the film pressing member 3 also includes a tool 33 for trimming the film body, the hot pressing ring 31 presses down to press the film body onto the middle frame member 2, and the film body is coated on the outside of the battery cell 21, and a pressure rod 321 for deforming the auxiliary pressure strip 32 is also arranged above the auxiliary pressure strip 32; The heat pressing ring 31 is used to press the film body onto the outside of the battery cell 21, forming a coating space between the film body and the battery cell 21, and one end of the auxiliary pressure strip 32 is pressed into the coating space between the film body and the middle frame 2. When the heat pressing ring 31 is pressed down, the pressure rod 321 squeezes the auxiliary pressure strip 32 into a U shape to form an arc channel. The arc channel is used as an exhaust channel for the coating space to communicate with the external space. The auxiliary pressure strip 32 is deformed into a U shape, and one end of the U-shaped auxiliary pressure strip 32 is arranged under the film body. When the film is pressed, the U-shaped film body is used to press and exhaust at the same time. During the film pressing process, the auxiliary pressure strip 32 serves as an exhaust structure. When the film pressing is completed, the auxiliary pressure strip 32 can also be used as an auxiliary tear strip. By pulling the auxiliary pressure strip 32, the film body coated on the outside of the battery cell 21 can be torn off, thereby improving the convenience of film tearing.

[0023] The film pressing member 3 also includes a conical pressing platform 34, a hot pressing ring 31 is arranged below the conical pressing platform 34, a tool 33 is arranged on the conical pressing platform 34, and the top of the conical pressing platform 34 is connected to the output end of the driver 35. The tool 33 is arranged obliquely, and the inclination angle of the tool 33 matches the inclined surface of the conical pressing platform 34. The driver 35 drives the conical pressing platform 34 to press down, and the conical pressing platform 34 presses down the film body. The hot pressing ring 31 is arranged below the conical pressing platform 34, and the hot pressing ring 31 presses the film body onto the outer side of the battery cell 21. The film starts to heat up and is hot-pressed into the middle frame 2. The cutting end of the tool 33 is set at the edge of the large truncated cone of the conical pressing platform 34. When the hot-pressing ring 31 presses the film onto the middle frame 2, the conical pressing platform 34 presses the film into an inverted cone shape, so that the deformed film fits with the large truncated cone edge of the conical pressing platform 34, so that the cutting end of the tool 33 contacts the film. At this time, the tool 33 rotates to cut off the film at the edge of the truncated cone, so that the hot-pressed film is wrapped inside the middle frame 2. When the film pressing part 3 moves up, the pressed film will not be pulled away.

[0024] A rotating member 341 is installed on the conical pressing platform 34, and the rotating member 341 is connected to the tool 33. The rotating member 341 can drive the tool 33 to rotate to cut the film body after hot pressing. The rotating member 341 includes an annular plate connected to the tool 33, and a power component that drives the annular plate to rotate. The rotation of the annular plate then drives the tool 33 to rotate to cut and trim the film body.

[0025] The side end of the conical pressing platform 34 is provided with a plate body for placing the auxiliary pressure strip 32, and the plate body is provided with a groove for accommodating the auxiliary pressure strip 32, and the plate body is provided with a driving member for driving the pressure rod 321 to press down, and the auxiliary pressure strip 32 is squeezed and deformed by the pressure rod 321 pressing down. It should be noted that the groove is semi-circular, and the auxiliary pressure strip 32 is placed above the groove. When it is squeezed by the pressure rod 321, the auxiliary pressure strip 32 is pressed into the groove. Limited by the shape of the semi-circular groove, the auxiliary pressure strip 32 is adaptively deformed in the groove, thereby realizing the deformation of the auxiliary pressure strip 32 into a U shape. In this embodiment, the auxiliary pressure strip 32 is deformed during the film coating. During the film coating process, the deformed auxiliary pressure strip 32 is used as an exhaust channel for exhausting the gas inside the film coating, so as to prevent the film from expanding and rupturing due to excessive air in the film during the film coating process, resulting in film failure, and also avoiding excessive air inside the film. Extrusion during transportation easily causes failure of the hot pressing part, resulting in film falling off.

[0026] Example 2: Reference Figure 6 - Fig.11, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that an auxiliary rod 5 is provided at the side end of the conical pressing platform 34. The outer wall of the auxiliary rod 5 has a plurality of placement plates 51 in a circular array. Each placement plate 51 is provided with a placement groove 511. It should be noted that a semicircular pressing groove is also provided below the placement groove 511 to adapt to the deformation shape of the auxiliary pressure strip 32. An auxiliary pressure strip 32 is provided in each placement groove 511. The pressure rod 321 is provided in the placement groove 511 and is located above the auxiliary pressure strip 32. An extrusion groove 52 is provided on the outer wall of the auxiliary rod 5. One end of the placement plate 51 is provided in the extrusion groove 52 through a bent plate 512, and the lower part of the bent plate 512 is connected to the inner plate of the extrusion groove 52 through a spring. The outer wall of the auxiliary rod 5 is connected with an extrusion ring 53 through a bearing. The extrusion ring 53 is connected to the output end of the driver 35 through a connecting rod. The inner wall of the extrusion ring 53 is provided with an inner pressure plate 531. The outer wall of the bearing is provided with a moving groove, and the inner pressure plate 531 is provided in the moving groove. The upper end of the auxiliary rod 5 is connected to the motor. When the auxiliary rod 5 rotates, the extrusion grooves 52 on its surface are aligned with the moving grooves in turn. When one of the extrusion grooves 52 is aligned with the moving groove, the inner pressure plate 531 moves down in the moving groove and the extrusion groove 52 to squeeze the bent plate 512 in the extrusion groove 52. The extrusion ring 53 is pressed down together with the film pressing part 3. The extrusion ring 53 drives the auxiliary rod 5 to be pressed down. Each placement plate 51 can, when the auxiliary rod 5 is limited by the frame of the middle frame part 2 and cannot continue to be pressed down, the extrusion ring 5 As the film pressing member 3 continues to be pressed downward, the squeezing ring 53 drives the placement plate 51 below the film pressing member 3 to be pressed downward, so that one end of the auxiliary pressure strip 32 on the placement plate 51 is arranged above the battery cell 21, and the auxiliary pressure strip 32 is aligned by the power of the film pressing member 3 being pressed downward, and the downward pressing of a single placement plate 51 does not affect the discharge of other placement plates 51, thereby improving the convenience of discharge, and can drive a single placement plate 51 to be pressed downward without restriction to align the auxiliary pressure strip 32 without affecting the discharge.

[0027] Specifically, the inner pressure plate 531 of the extrusion ring 53 is pressed downward in the moving groove, thereby driving the bending plate 512 to be pressed downward, and driving the single placement plate 51 to be pressed downward.

[0028] The first pressing plate 513 and the second pressing plate 514 are hingedly installed on the placing plate 51, the two ends of the first pressing plate 513 are end a and end b respectively, the two ends of the second pressing plate 514 are end c and end d, the end a of the first pressing plate 513 contacts the upper end surface of the pressing rod 321, the end b of the first pressing plate 513 is arranged above the end c of the second pressing plate 514, the outer wall of the extrusion ring 53 is provided with an outer pressing plate 532, and the outer pressing plate 532 is arranged above the end d of the second pressing plate 514. When the extrusion ring 53 moves downward, the outer pressing plate 532 presses down on the first pressing plate 513. The d end of the second pressure plate 514 is squeezed, the d end of the second pressure plate 514 moves downward, and the c end is lifted. While the c end of the second pressure plate 514 is lifted, the b end of the first pressure plate 513 is lifted, and while the b end of the first pressure plate 513 is lifted, the a end of the first pressure plate 513 is pressed downward, and then the pressure rod 321 is squeezed to drive the auxiliary pressure strip 32 to deform. This embodiment utilizes the power of the pressing film 3 to press down, and at the same time, it can also drive the pressure rod 321 to press down to deform the auxiliary pressure strip 32, thereby reducing the driving cost.

[0029] Embodiment 3: This is the third embodiment of the present invention. This embodiment is different from the second embodiment in that the battery cell 21 of the middle frame 2 can be a base paper made of nano-cellulose, carbon nanotubes are embedded in the base paper, and a layer of solidified charged polystyrene plastic solution is covered on the outside of the base paper. The base paper can act as a battery. It should be noted that the battery cell 21 can be a coil layer for wireless charging of the battery. The automatic coating machine is used to coat the surface of the battery cell 21 to protect the battery cell 21.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic film coating machine for a mobile phone middle frame, comprising a placement tray (1) and a middle frame member (2) placed on the placement tray (1), wherein a battery cell (21) to be coated is integrally arranged on the middle frame member (2), characterized in that: A film pressing member (3) is arranged above the placement plate (1), the film pressing member (3) comprising a heat pressing ring (31) for pressing the film body, and an auxiliary pressing strip (32), one end of the auxiliary pressing strip (32) being inserted and arranged below the heat pressing ring (31) and the film body, the film pressing member (3) also comprising a tool (33) for trimming the film body, the heat pressing ring (31) pressing down to press the film body onto the middle frame member (2), and wrapping the film body onto the outside of the battery cell (21), and a pressure rod (321) for deforming the auxiliary pressing strip (32) is also arranged above the auxiliary pressing strip (32); The heat pressing ring (31) is used to press the membrane body onto the outside of the battery cell (21), so that a wrapping space is formed between the membrane body and the battery cell (21); one end of the auxiliary pressure strip (32) is pressed into the wrapping space between the membrane body and the middle frame member (2); while the heat pressing ring (31) is pressed downward, the pressure rod (321) squeezes the auxiliary pressure strip (32) into a U shape to form an arc-shaped channel, and the arc-shaped channel is used as an exhaust channel for the wrapping space to communicate with the external space.

2. According to claim 1, the automatic film coating machine for mobile phone middle frame is characterized in that: The film pressing member (3) further comprises a conical pressing platform (34), a hot pressing ring (31) is arranged below the conical pressing platform (34), a tool (33) is arranged on the conical pressing platform (34), and the top of the conical pressing platform (34) is connected to the output end of a driver (35), and the driver (35) drives the conical pressing platform (34) to press downward.

3. According to claim 2, the mobile phone middle frame automatic film coating machine is characterized in that: A rotating member (341) is installed on the conical pressing platform (34); the rotating member (341) is connected to the cutter (33); the rotating member (341) can drive the cutter (33) to rotate, thereby cutting the film body after heat pressing.

4. The mobile phone middle frame automatic film coating machine according to claim 3, characterized in that: The tool (33) is arranged in an oblique shape, and the inclination angle of the tool (33) matches the inclined surface of the conical pressing platform (34).

5. The mobile phone middle frame automatic film coating machine according to claim 4, characterized in that: An auxiliary rod (5) is provided at the side end of the conical pressing platform (34), and a plurality of placement plates (51) are provided in a circular array on the outer wall of the auxiliary rod (5). Each placement plate (51) is provided with a placement groove (511), and an auxiliary pressure strip (32) is placed in the placement groove (511).

6. The mobile phone middle frame automatic film coating machine according to claim 5, characterized in that: The placement grooves (511) are each provided with an auxiliary pressure strip (32), and the pressure rod (321) is provided in the placement grooves (511) and is located above the auxiliary pressure strip (32).

7. The mobile phone middle frame automatic film coating machine according to claim 6, characterized in that: An extrusion groove (52) is provided on the outer wall of the auxiliary rod (5), one end of the placement plate (51) is arranged in the extrusion groove (52) via a bent plate (512), and the lower part of the bent plate (512) is butted against the inner plate of the extrusion groove (52) via a spring.

8. The mobile phone middle frame automatic film coating machine according to claim 7, characterized in that: The outer wall of the auxiliary rod (5) is connected to an extrusion ring (53) via a bearing, the extrusion ring (53) is connected to the output end of the driver (35) via a connecting rod, the inner wall of the extrusion ring (53) is provided with an inner pressure plate (531), the outer wall of the bearing is provided with a movable groove, the inner pressure plate (531) is arranged in the movable groove, the upper end of the auxiliary rod (5) is connected to the motor, when the auxiliary rod (5) rotates, the extrusion grooves (52) on its surface are aligned with the movable grooves in sequence, when one of the extrusion grooves (52) is aligned with the movable groove, the inner pressure plate (531) moves downward in the movable groove and the extrusion groove (52) to extrude the bent plate (512) in the extrusion groove (52).

9. The mobile phone middle frame automatic film coating machine according to claim 8, characterized in that: The placement plate (51) is hingedly mounted with a first pressing plate (513) and a second pressing plate (514), respectively; the two ends of the first pressing plate (513) are end a and end b, respectively; the two ends of the second pressing plate (514) are end c and end d; the end a of the first pressing plate (513) is in contact with the upper end surface of the pressing rod (321); the end b of the first pressing plate (513) is arranged above the end c of the second pressing plate (514); an outer pressing plate (532) is arranged on the outer wall of the extrusion ring (53); and the outer pressing plate (532) is arranged above the end d of the second pressing plate (514).

10. The mobile phone middle frame automatic film coating machine according to claim 9, characterized in that: The battery cell (21) of the middle frame (2) is a base paper made of nano-scale cellulose, carbon nanotubes are embedded in the base paper, and the outer side of the base paper is covered with a layer of solidified charged polystyrene plastic solution.

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