An automatic film covering and hot cutting assembly for a hearing aid main housing

Abstract

The utility model provides a kind of automatic film covering packaging and hot cutting assembly for hearing aid host shell, it is related to film processing technical field.The automatic film covering packaging and hot cutting assembly for hearing aid host shell includes film covering table and two support side plates fixedly installed in the bottom of film covering table, the top of film covering table is equipped with filling port, lifting platform is equipped in filling port, one of the support side plate is fixedly installed with rodless cylinder one, the sliding block of rodless cylinder one is fixedly installed with connecting folding table, rotating shell is fixedly installed on connecting folding table, rotating shaft is rotatably installed in rotating shell, rotating arm is fixedly set on rotating shaft, servo motor one is fixedly installed on the side outer wall of rotating shell.The utility model has the advantages of higher degree of automation, can reduce the number of manual intervention, and has higher working efficiency.

Description

Technical Field

[0001] This utility model relates to the field of film coating technology, specifically to an automatic film coating and heat-cutting assembly for the shell of a hearing aid main unit. Background Technology

[0002] Hearing aids are electronic devices used to help hearing-impaired patients improve their hearing. By amplifying sound signals and optimizing sound quality, they enable patients to perceive sounds more clearly. During the production process of hearing aids, the outer shell of the hearing aid unit needs to be coated with a transparent film to prevent external dust from entering and provide protection. The common coating method is to manually place the outer shell of the unit on the coating machine and then coat it with film. After coating, the film is cut using a heat-cutting method. However, the film is relatively loose at this point. In order to tightly wrap it around the outer shell of the unit, the coated outer shell of the unit needs to be sent into a film shrink oven, where hot air is used to heat the film to make it adhere tightly to the outer shell of the unit.

[0003] However, during the lamination process, after the main body shell of one hearing aid is laminated, the next main body shell needs to be placed on the lamination work surface to continue lamination. Furthermore, the laminated main body shell still needs to be manually sent into the shrink oven for heating and shrinking. The entire process involves a lot of manual intervention, which slows down the lamination effect.

[0004] Therefore, it is necessary to provide a new automated film-coating and heat-cutting assembly for the housing of a hearing aid main unit to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide an automated film-coating and heat-cutting assembly for the housing of a hearing aid unit that has a high degree of automation, reduces the number of manual interventions, and has high work efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides an automatic film-coating and heat-cutting assembly for a hearing aid main unit shell, comprising: a film-coating platform and two supporting side plates fixedly installed at the bottom of the film-coating platform. The top of the film-coating platform has a filling opening, and a lifting platform is provided inside the filling opening. A rodless cylinder is fixedly installed on one of the supporting side plates. A connecting folding platform is fixedly installed on the slider of the rodless cylinder. A rotating shell is fixedly installed on the connecting folding platform. A rotating shaft is rotatably installed inside the rotating shell. A rotating arm is fixedly sleeved on the rotating shaft. A servo motor is fixedly installed on one outer wall of the rotating shell. The output shaft of the servo motor is fixedly connected to one end of the rotating shaft. The top of the rotating arm is fixedly connected to the lifting platform. The two supporting side plates... Two U-shaped frames, one on each side and one on the opposite side, are fixedly installed. Each U-shaped frame contains a film-laying mechanism. A rodless cylinder is fixedly installed on the top of the U-shaped frame. An installation frame is fixedly installed on the slider of the rodless cylinder. A central shaft is rotatably installed at the bottom of the installation frame. A servo motor is fixedly installed inside the installation frame. The output shaft of the servo motor is fixedly connected to the top of the central shaft. A clamping mechanism is provided on the central shaft. Telescopic cylinders are fixedly installed on the top of both U-shaped frames. Connecting arms are fixedly installed on the output shafts of both telescopic cylinders. A rectangular sleeve is fixedly installed on the side of the two connecting arms that are close to each other. A heat-cutting assembly is provided on the rectangular sleeve.

[0007] Preferably, the film feeding mechanism includes four roller supports, which are respectively fixedly installed on the top inner wall and bottom inner wall of the U-shaped frame one and the U-shaped frame two. The lower two roller supports are respectively rotatably mounted with a lower feeding roller and a lower take-up roller, and the upper two roller supports are respectively rotatably mounted with an upper feeding roller and an upper take-up roller. A servo motor three is fixedly installed on one outer wall of each of the four roller supports, and the output shafts of the four servo motors three are respectively fixedly connected to the ends of the lower feeding roller, the lower take-up roller, the upper feeding roller, and the upper take-up roller.

[0008] Preferably, the clamping mechanism includes an open frame, which is fixedly installed on the central shaft. Two telescopic cylinders are fixedly installed inside the open frame. Clamping bars are fixedly installed on the output shafts of the two telescopic cylinders. The clamping bars are located on one side between the lower roll and the upper roll.

[0009] Preferably, the hot-cutting assembly includes a rectangular recess, which is formed at the bottom of the rectangular sleeve. A rectangular heating element is disposed within the rectangular recess. A common connecting frame is fixedly mounted on the top of the two connecting arms. Two telescopic cylinders are fixedly mounted on the inner top wall of the connecting frame. A common bearing plate is fixedly mounted on the output shaft of the two telescopic cylinders. Four sliding rods are fixedly mounted on the bottom of the bearing plate. A common rectangular ring cutter is fixedly mounted on the bottom end of the four sliding rods. The bottom of the rectangular ring cutter is higher than the bottom end face of the rectangular heating element, and the inner wall of the rectangular ring cutter is flush with the bottom surface of the rectangular heating element. The outer walls of the rectangular sleeve are fitted together, and the two sliding rods respectively pass through the two connecting arms and are slidably connected to the corresponding connecting arms. A sliding joint rod is slidably installed on the bearing plate, and a cross connecting rod is fixedly installed at the bottom end of the sliding joint rod. The four ends of the cross connecting rod extend into the rectangular groove and are fixedly connected to the rectangular heating element. The cross connecting rod is slidably connected to the four inner walls of the rectangular sleeve. A circular connecting piece is fixedly sleeved on the sliding joint rod, and a return spring is sleeved on the sliding joint rod. The top end of the return spring is fixedly connected to the bearing plate, and its bottom end is fixedly connected to the circular connecting piece.

[0010] Preferably, a guide roller is fixedly installed on the side of the coating table near the lower take-up roller, and the guide roller is adapted to the lower take-up roller.

[0011] Preferably, the rectangular sleeve has slides on all four sides, and the cross connecting rod passes through the four slides and contacts the inner wall of the four slides.

[0012] Compared with related technologies, the automatic film-coating and heat-cutting assembly for hearing aid main unit shell provided by this utility model has the following advantages:

[0013] This invention, through the cooperation of components such as a rodless cylinder, a rotating arm, and a lifting platform, allows the lifting platform to be rotated to an inclined state. This automatically feeds the un-shrinked main unit casing wrapped in film into the film shrink oven for shrinkage. Furthermore, through the cooperation of components such as a rodless cylinder, a central shaft, and a telescopic cylinder, the next main unit casing to be coated can be automatically clamped onto the coating table for coating. This significantly reduces manual intervention, resulting in a high degree of automation and improved coating efficiency. In addition, the cooperation of a rectangular heating element and a rectangular ring cutter can wrap the main unit casing in film and create a heat-cutting effect, thereby increasing the tightness of the film wrapping the main unit casing and improving the protective effect. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the automatic film-coating and heat-cutting assembly for the housing of a hearing aid main unit provided by this utility model;

[0015] Figure 2 This is a schematic diagram of the oblique upward view structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the connection structure between the rotating arm and the lifting platform in this utility model;

[0017] Figure 4 This is an assembly diagram of the rectangular sleeve and the rectangular ring cutter in this utility model;

[0018] Figure 5 This is a cross-sectional view of the rectangular sleeve in this utility model;

[0019] Figure 6 This is a bottom view of the assembly of the rectangular sleeve and the rectangular heating element in this utility model;

[0020] Figure 7 This is a schematic diagram of the connection structure between the rectangular heating element and the cross-shaped connecting rod in this utility model;

[0021] Figure 8 This is a schematic diagram of the film coating working state in this utility model;

[0022] Figure 9 This is a schematic diagram of the internal structure of the spiral frame one and spiral frame two in this utility model;

[0023] Figure 10 This is a schematic diagram of the connection structure between the telescopic cylinder and the clamping bar in this utility model.

[0024] The diagram is labeled as follows: 1. Laminating table; 2. Supporting side plate; 3. Filling port; 4. Lifting platform; 5. Rodless cylinder one; 6. Connecting folding table; 7. Rotating outer shell; 8. Rotating arm; 9. U-shaped frame one; 10. U-shaped frame two; 11. Roller bracket; 12. Lower roll; 13. Lower take-up roll; 14. Upper roll; 15. Upper take-up roll; 16. Rodless cylinder two; 17. Mounting frame; 18. Central shaft; 19. Opening frame; 20. Telescopic cylinder one; 21. Clamping strip; 22. Telescopic cylinder two; 23. Connecting arm; 24. Rectangular sleeve; 25. Rectangular sink; 26. Rectangular heating element; 27. Telescopic cylinder three; 28. Bearing plate; 29. ​​Sliding rod; 30. Rectangular ring cutter; 31. Connecting frame; 32. Sliding rod; 33. Cross connecting rod; 34. Circular connecting piece; 35. Return spring. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please refer to the following: Figures 1-10The automatic film-coating and heat-cutting assembly for hearing aid housings includes: a film-coating platform 1 and two supporting side plates 2 fixedly installed at the bottom of the film-coating platform 1. A filling port 3 is provided at the top of the film-coating platform 1, and a lifting platform 4 is provided inside the filling port 3. A rodless cylinder 5 is fixedly installed on one of the supporting side plates 2, and a connecting folding table 6 is fixedly installed on its built-in slider. A rotating housing 7 is fixedly installed on the connecting folding table 6, and a rotating shaft is rotatably installed inside the rotating housing. A rotating arm 8 is fixedly sleeved on the rotating shaft. A servo motor 1 is fixedly installed on one outer wall of the rotating housing 7, and its output shaft is fixedly connected to one end of the rotating shaft. The top of the rotating arm 8 is fixedly connected to the lifting platform 4. By running the servo motor 1, the lifting platform 4 can be rotated, thereby tilting it and automatically sending the housing wrapped with film into an external film shrink oven for heat shrinking treatment. A U-shaped... The system comprises a frame 1 (9) and a U-shaped frame 2 (10). Both frames have a film-laying mechanism. A rodless cylinder 2 (16) is fixedly mounted on the top of the U-shaped frame 1 (9), and an installation frame 17 is fixedly mounted on its slider. A central shaft 18 is rotatably mounted on the bottom of the installation frame 17. A servo motor 2 (2) is fixedly mounted inside the installation frame 17, and its output shaft is fixedly connected to the top of the central shaft 18. A clamping mechanism is provided on the central shaft 18 to clamp the main unit casing to be coated, automatically clamping the main unit casing onto the coating table 1 for coating. Telescopic cylinders 22 (22) are fixedly mounted on the top of both the U-shaped frame 1 (9) and the U-shaped frame 2 (20). Connecting arms 23 are fixedly mounted on the output shafts of both telescopic cylinders 22. A rectangular sleeve 24 is fixedly mounted on the side of the two connecting arms 23 that are close to each other. The rectangular sleeve 24 is equipped with a heat-cutting component, which can heat-cut the film to ensure a tight seal around the main unit casing.

[0027] The aforementioned film feeding mechanism includes four roller supports 11. The four roller supports 11 are respectively fixedly installed on the top inner wall and bottom inner wall of the U-shaped frame 1 9 and the U-shaped frame 2 10 by bolts. The two roller supports 11 located at the bottom are respectively rotatably mounted with a lower feeding roller 12 and a lower take-up roller 13. The two roller supports 11 located at the top are respectively rotatably mounted with an upper feeding roller 14 and an upper take-up roller 15. Servo motors 3 are fixedly installed on one outer wall of each of the four roller supports 11. The output shafts of the four servo motors 3 are respectively fixedly connected to the ends of the lower feeding roller 12, the lower take-up roller 13, the upper feeding roller 14, and the upper take-up roller 15. This allows the two rolls of film to be distributed one above the other, placing the main unit housing between the two rolls of film, thereby wrapping the main unit housing. Furthermore, a guide roller is fixedly installed on the side of the laminating table 1 near the lower take-up roller 13. The guide roller is adapted to the lower take-up roller 13 and can guide the film.

[0028] The aforementioned clamping mechanism includes an open frame 19 fixedly installed on the central shaft 18, and two telescopic cylinders 20 are fixedly installed inside the open frame 19. Clamping bars 21 are fixedly installed on the output shafts of the two telescopic cylinders 20, and the clamping bars 21 are located on one side between the lower roll 12 and the upper roll 14.

[0029] The aforementioned heat-cutting assembly includes a rectangular recess 25 formed at the bottom of the rectangular sleeve 24. A rectangular heating element 26 is housed within this recess 25. This rectangular heating element 26 is a common type of heating element, rectangular in shape, and powered by a common electrical wire. Furthermore, the tops of the two connecting arms 23 are fixedly mounted with the same connecting frame 31. Two telescopic cylinders 27 are fixedly mounted on the inner top wall of the connecting frame 31. The output shafts of the two telescopic cylinders 27 are fixedly mounted with the same bearing plate. 28. Four sliding rods 29 are fixedly installed at the bottom of the support plate 28. A rectangular ring cutter 30 is fixedly installed at the bottom end of the four sliding rods 29. The bottom of the rectangular ring cutter 30 is higher than the bottom end face of the rectangular heating element 26, and the inner wall of the rectangular ring cutter 30 is in contact with the outer wall of the rectangular sleeve 24. Two of the sliding rods 29 pass through two connecting arms 23 respectively and are slidably connected to the corresponding connecting arms 23. A sliding connecting rod 32 is slidably installed on the support plate 28. A cross connecting rod is fixedly installed at the bottom end of the sliding connecting rod 32. 33. The four ends of the cross link 33 extend into the rectangular recess 25 and are fixedly connected to the rectangular heating element 26. The cross link 33 is slidably connected to the four inner walls of the rectangular sleeve 24. A circular connecting piece 34 is fixedly sleeved on the sliding rod 32. A return spring 35 is sleeved on the sliding rod 32. The top end of the return spring 35 is fixedly connected to the bearing plate 28, and its bottom end is fixedly connected to the circular connecting piece 34. By setting the bottom of the rectangular ring cutter 30 slightly higher than the bottom end face of the rectangular heating element 26, the telescopic movement can be activated. When cylinder 3 27 extends, the rectangular heating element 26 first contacts the film, causing the upper and lower films to thermally adhere. Then, under the elastic action of the return spring 35, the rectangular ring cutter 30 continues to descend and finally cuts off the film covering the main unit casing. In addition, the sliding connection between the cross link 33 and the four inner walls of the rectangular sleeve 24 mentioned above is achieved by providing slides on all four sides of the rectangular sleeve 24, allowing the cross link 33 to pass through the four slides and contact the inner walls of the four slides.

[0030] The working principle of the automatic film-coating and heat-cutting assembly for the hearing aid main unit shell provided by this utility model is as follows:

[0031] This device is used in conjunction with an external belt feeding assembly and a film shrinking furnace. The belt conveyor assembly delivers the hearing aid main unit housing to a position that the clamping bar 21 can grip. The belt conveyor assembly and the rodless cylinder 16 are vertically distributed. In addition, the film shrinking furnace can be used in conjunction with the lifting platform 4, which is located on one side of the lifting platform 4.

[0032] In the initial state, both the lower unwinding roller 12 and the upper unwinding roller 14 are wrapped with film. Before use, the corresponding servo motor 3 is started, which drives the lower unwinding roller 12 and the upper unwinding roller 14 to rotate and start unwinding. At this time, the ends of the two rolls of film are picked up and pulled. When the ends of the two rolls of film are pulled to the positions of the lower take-up roller 13 and the upper take-up roller 15 respectively, the servo motor 3 that was started is turned off. Then, the ends of the two rolls of film are fixed on the lower take-up roller 13 and the upper take-up roller 15 respectively. After that, the servo motor 3 corresponding to the lower take-up roller 13 is started, so that the lower take-up roller 13 performs the take-up operation until the film between the lower unwinding roller 12 and the lower take-up roller 13 is taut. Then, the servo motor 3 is turned off. The taut film is above the laminating table 1 and in contact with the top of the laminating table 1. At this time, the film between the upper unwinding roller 14 and the upper take-up roller 15 is loose.

[0033] When it is necessary to apply a film to the hearing aid main body shell, first start the servo motor 2 in the forward direction. Its output shaft drives the central shaft 18 to rotate, which in turn drives the open frame 19 to rotate. After the open frame 19 rotates 90°, the two clamping strips 21 are positioned above the belt conveyor assembly. Then, the main body shell is conveyed between the two clamping strips 21 through the belt conveyor assembly. After that, the output shafts of the two telescopic cylinders 20 are extended, and the two clamping strips 21 move closer to each other, finally clamping one main body shell. Then, start the servo motor 2 in the reverse direction, and the clamping strips 21 rotate 90°. Next, start the rodless cylinder 16. The slider on it moves the clamped main body shell upwards towards the film application table 1. After moving to the final position, start the output shaft of the telescopic cylinder 20 to retract, which releases the main body shell, allowing it to fall onto the film on the film application table 1. Then, start the rodless cylinder 16 to bring the clamping strips 21 back to their original position.

[0034] Subsequently, the output shafts of the two telescopic cylinders 22 extend, and the rectangular sleeve 24 descends under the drive of the connecting arm 23. During the descent, it gradually covers the main unit casing. When its bottom contacts the loose film, it presses the film down, eventually causing the upper and lower films to adhere. Then, the output shafts of the two telescopic cylinders 27 extend, and the rectangular heating element 26 and the rectangular ring cutter 30 descend under the influence of the bearing plate 28. Because the bottom end face of the rectangular heating element 26 is lower than the bottom of the rectangular ring cutter 30, it will contact the film first. At this time, affected by the heat of the rectangular heating element 26, the upper and lower films will form a thermal adhesion effect. At the same time, under the elastic cooperation of the return spring 35, the rectangular ring cutter 30 continues to descend. When it finally contacts the film, it cuts the film. At this time, the main unit casing is in a space formed by the upper and lower films.

[0035] Then, the output shaft of telescopic cylinder 27 is retracted to bring the rectangular heating element 26 and the rectangular ring cutter 30 back to their original positions. Next, the output shaft of telescopic cylinder 22 is retracted to bring the rectangular sleeve 24 back to its original position. Then, rodless cylinder 5 is activated, and its slider lowers the rotating housing 7. At this time, the main housing wrapped in film also falls down, eventually bringing it to the bottom of the laminating table 1. Then, servo motor 1 is activated, and its output shaft drives the rotating shaft to rotate, which in turn rotates the lifting platform 4. When the lifting platform 4 rotates to the tilted state, it aligns with the inlet of the external film shrinking oven. At this time, the main housing wrapped in film falls directly into the film shrinking oven for shrinking, thus completing the laminating work of one main housing. Then, four servo motors 3 are activated to rewind the cut end of the film. After a section of film is moved back to the bottom of the rectangular sleeve 24, the four servo motors 3 are turned off.

[0036] While the above process is in progress, the servo motor can be started again in the forward direction to rotate the clamping bar 21 back to the top of the belt conveyor and clamp the next main unit housing to be coated. After the previous main unit housing is coated, the next main unit housing can be quickly brought to the coating table 1, so that the next coating work can be carried out quickly. This process is repeated until all the main unit housings are coated.

[0037] Compared with related technologies, the automatic film-coating and heat-cutting assembly for hearing aid main unit shell provided by this utility model has the following advantages:

[0038] This invention provides an automatic film-coating and heat-cutting assembly for hearing aid main unit shells. Through the cooperation of components such as a rodless cylinder 5, a rotating arm 8, and a lifting platform 4, the lifting platform 4 can be rotated to an inclined state, automatically feeding the main unit shell, which is not yet fully shrunken and wrapped in film, into a film shrink oven for shrinking. Furthermore, through the cooperation of components such as a rodless cylinder 16, a central shaft 18, and a telescopic cylinder 20, the next main unit shell to be coated can be automatically clamped onto the coating table 1 for coating, thus significantly reducing manual intervention, achieving a high degree of automation, and effectively improving coating efficiency. In addition, the cooperation of a rectangular heating element 26 and a rectangular ring cutter 30 can wrap the main unit shell within the film and achieve a heat-cutting effect, thereby increasing the tightness of the film wrapping the main unit shell and improving the protective effect.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An automated lamination and heat-cutting assembly for a hearing aid main unit shell, comprising a lamination platform and two supporting side plates fixedly installed at the bottom of the lamination platform, characterized in that, The top of the laminating table has a filling port, and a lifting platform is installed inside the filling port. A rodless cylinder is fixedly mounted on one of the supporting side plates. A connecting folding table is fixedly mounted on the slider of the rodless cylinder. A rotating housing is fixedly mounted on the connecting folding table. A rotating shaft is rotatably mounted inside the rotating housing. A rotating arm is fixedly sleeved on the rotating shaft. A servo motor is fixedly mounted on one outer wall of the rotating housing. The output shaft of the servo motor is fixedly connected to one end of the rotating shaft. The top of the rotating arm is fixedly connected to the lifting platform. A U-shaped frame one and a U-shaped frame two are fixedly mounted on the opposite sides of the two supporting side plates. A film-laying mechanism is provided within the first and second spiral-shaped frames. A rodless cylinder is fixedly installed on the top of the first spiral-shaped frame, and an installation frame is fixedly installed on the slider of the rodless cylinder. A central shaft is rotatably installed at the bottom of the installation frame, and a servo motor is fixedly installed inside the installation frame. The output shaft of the servo motor is fixedly connected to the top of the central shaft, and a clamping mechanism is provided on the central shaft. Telescopic cylinders are fixedly installed on the top of both the first and second spiral-shaped frames, and connecting arms are fixedly installed on the output shafts of both telescopic cylinders. A rectangular sleeve is fixedly installed on the side of the two connecting arms that are close to each other, and a heat-cutting assembly is provided on the rectangular sleeve.

2. The automatic film-coating and heat-cutting assembly for the hearing aid main unit shell according to claim 1, characterized in that, The film feeding mechanism includes four roller supports, which are respectively fixedly installed on the top inner wall and bottom inner wall of the U-shaped frame one and the U-shaped frame two. The lower roller supports are respectively rotatably mounted with a lower feeding roller and a lower take-up roller, and the upper roller supports are respectively rotatably mounted with an upper feeding roller and an upper take-up roller. A servo motor three is fixedly installed on one outer wall of each of the four roller supports, and the output shafts of the four servo motors three are respectively fixedly connected to the ends of the lower feeding roller, the lower take-up roller, the upper feeding roller, and the upper take-up roller.

3. The automatic film-coating and heat-cutting assembly for the hearing aid main unit shell according to claim 2, characterized in that, The clamping mechanism includes an open frame, which is fixedly installed on the central shaft. Two telescopic cylinders are fixedly installed inside the open frame. Clamping bars are fixedly installed on the output shafts of the two telescopic cylinders. The clamping bars are located on one side between the lower roll and the upper roll.

4. The automatic film-coating and heat-cutting assembly for the hearing aid main unit shell according to claim 1, characterized in that, The hot-cutting assembly includes a rectangular recess, which is formed at the bottom of the rectangular sleeve. A rectangular heating element is disposed within the rectangular recess. A common connecting frame is fixedly mounted on the top of the two connecting arms. Two telescopic cylinders are fixedly mounted on the inner top wall of the connecting frame. A common bearing plate is fixedly mounted on the output shaft of the two telescopic cylinders. Four sliding rods are fixedly mounted on the bottom of the bearing plate. A common rectangular ring-cutting blade is fixedly mounted on the bottom end of the four sliding rods. The bottom of the rectangular ring-cutting blade is higher than the bottom end face of the rectangular heating element, and the inner wall of the rectangular ring-cutting blade is flush with the bottom surface of the rectangular heating element. The outer walls of the rectangular sleeve are fitted together, and the two sliding rods respectively pass through the two connecting arms and are slidably connected to the corresponding connecting arms. A sliding joint rod is slidably installed on the bearing plate, and a cross connecting rod is fixedly installed at the bottom end of the sliding joint rod. The four ends of the cross connecting rod extend into the rectangular groove and are fixedly connected to the rectangular heating element. The cross connecting rod is slidably connected to the four inner walls of the rectangular sleeve. A circular connecting piece is fixedly sleeved on the sliding joint rod, and a return spring is sleeved on the sliding joint rod. The top end of the return spring is fixedly connected to the bearing plate, and its bottom end is fixedly connected to the circular connecting piece.

5. The automatic film-coating and heat-cutting assembly for the hearing aid main unit shell according to claim 2, characterized in that, A guide roller is fixedly installed on the side of the coating table near the lower take-up roller, and the guide roller is adapted to the lower take-up roller.

6. The automatic film-coating and heat-cutting assembly for the hearing aid main unit shell according to claim 4, characterized in that, The rectangular sleeve has slides on all four sides, and the cross connecting rod passes through the four slides and contacts the inner walls of the four slides.

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