A suction cup, a film coating device and a filling production line

Abstract

The present invention discloses a suction cup, a film-adding device and a filling production line, which belong to the technical field of filling equipment. The suction cup includes an outer shell, an inner tube and a spring. The rear end of the outer shell is provided with a ventilation cavity, and the inner tube is provided with an airway. The suction cup also includes a suction nozzle, a vacuum breaker and a shaping disk. The front end of the inner tube is provided with a concave cavity. The suction nozzle and the vacuum breaker are arranged in the concave cavity and the vacuum breaker is sleeved on the outside of the suction nozzle. The suction nozzle is provided with an air hole. The shaping disk is sleeved on the outside of the front end of the inner tube and partially extends forward beyond the inner tube. When the suction cup places the diaphragm at the mouth of the cup, the edge of the diaphragm is bent and deformed downward under the shaping action of the shaping disk. The film-adding device includes the aforementioned suction cup, and the filling production line includes the aforementioned film-adding device. The shaping disk is used to pre-shape the diaphragm so that the edge of the diaphragm is bent and deformed and clamps the mouth of the cup, so that the diaphragm can move forward synchronously with the cup body, so that the diaphragm is in a set position after heat sealing and shaping, which is beneficial to improving the appearance of the product and also beneficial to improving the heat sealing effect of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of filling equipment, in particular to a suction cup. The present invention also relates to a film-adding device using the suction cup. In addition, the present invention also relates to a filling production line using the film-adding device. Background Art

[0002] In the field of filling technology, some products use an aluminum cover film for sealing after the cup body is filled with material. The sealing process in the existing technology is based on the linear filling process and generally includes three steps: adding the cover film, heat sealing, and shaping. In the step of adding the cover film, a rolling installation structure is generally used to place the cover film on the cup body. For example, the invention application with the announcement number CN111153209A discloses a self-rotating conveying device. In this technical solution, the suction cup is only responsible for sucking the cover film. The operating function of the entire self-rotating conveying device with respect to the cover film is limited to changing the spatial position of the cover film, that is, it only realizes the function of transporting the cover film. After the cover film is placed on the cup body, the cover film and the cup body can only interact with each other in the horizontal direction by the friction between the two. Because the cup body generally moves forward in a step-by-step manner in the linear filling process, the cover film will inevitably move relative to the cup body due to its own inertia during the process of the cup body moving from static to moving and then to static. Deviating from the set position after heat sealing and shaping, the cover film deviates from the production set position, greatly affecting the appearance of the product. In addition, if the cover film deviates a large distance when moving forward, it may easily lead to the problem of loose sealing of the product, which will seriously affect the qualified rate of the product. Summary of the Invention

[0003] In order to solve the shortcomings and deficiencies in the above-mentioned prior art, the present invention provides a suction cup, which, through structural improvement, can properly shape the diaphragm when the suction cup places the diaphragm at the cup mouth, so that the diaphragm can maintain a stable position relative to the cup body when moving forward.

[0004] In order to achieve the above technical objectives, the present invention provides a suction cup for sucking up a diaphragm and placing the diaphragm at the cup mouth of a cup body. The suction cup includes a hollow outer shell, an inner tube that can move back and forth and is arranged in the outer shell, and a spring that is sleeved on the outside of the inner tube and is used to drive the inner tube to reset. The rear end of the outer shell is provided with a ventilation cavity, and the inner tube is provided with an air duct connected to the ventilation cavity. The suction cup also includes a suction nozzle, a vacuum breaking part and a shaping disk. The front end of the inner tube is provided with a concave cavity, the suction nozzle and the vacuum breaking part are arranged in the concave cavity and the vacuum breaking part is sleeved on the outside of the suction nozzle, the suction nozzle is provided with an air hole that is arranged through front and back and is connected to the air duct, the shaping disk is sleeved on the outside of the front end of the inner tube and partially extends forward beyond the inner tube. When the suction cup places the diaphragm at the cup mouth, the edge of the diaphragm is bent and deformed downward under the shaping action of the shaping disk.

[0005] Preferably, the cross-sectional shape of the shaping disc along the front-to-back direction is a hollow trumpet shape that is wide at the front and narrow at the back.

[0006] Preferably, the shaping disc is mounted on the outside of the front end of the inner tube via a fastening sleeve, and the fastening sleeve is fixedly connected to the inner tube.

[0007] Preferably, the suction nozzle is provided with a through hole for connecting the air hole and the cavity.

[0008] Preferably, the suction nozzle is connected to the inner tube through threaded engagement, and the inner tube is provided with a threaded hole that cooperates with the suction nozzle between the airway and the concave cavity, and the rear end of the suction nozzle is screwed into the threaded hole.

[0009] Preferably, the outer shell includes a front shell and a rear shell connected together to form a ventilation cavity. The rear end of the inner tube is located in the ventilation cavity and a limiting portion protruding outward is provided on the outer wall. The limiting portion cooperates with the rear end surface of the front shell to limit the movement distance of the inner tube in the front and rear directions.

[0010] The present invention also provides a film-forming device, comprising a frame, a rotating cage assembly that can be raised and lowered on the frame, and a lifting assembly that drives the rotating cage assembly to rise and fall. The rotating cage assembly comprises a horizontally placed bracket, a rotating power component that drives the bracket to rotate, and a plurality of distribution pipes distributed on the bracket at intervals along the circumferential direction. The distribution pipes are horizontally placed and provided with air flow channels. The film-forming device also includes the suction cup described above. A plurality of suction cups are distributed at intervals along the length direction of the distribution pipe, and the ventilation cavity of the suction cup is connected to the air flow channel.

[0011] Preferably, the lifting assembly includes a motor, a transmission shaft driven by the motor, a swing arm mounted on the transmission shaft, a pull rod connected to the swing arm, and a lifting seat connected to the pull rod. The transmission shaft can be rotatably placed horizontally on the frame, and the bracket can be rotatably mounted on the lifting seat. The motor drives the cage assembly to rise and fall through the transmission shaft, swing arm, pull rod and lifting seat.

[0012] Preferably, the lifting assembly includes a seat plate fixed on the frame and a guide rod vertically arranged on the seat plate, and the lifting seat sleeve is arranged on the guide rod.

[0013] The present invention also provides a filling production line, comprising the above-mentioned film adding device.

[0014] After adopting the above technical solution, the present invention has the following advantages:

[0015] 1. The suction cup provided by the present invention has a suction nozzle and a vacuum breaker arranged in the concave cavity at the front end of the inner tube, and a shaping disc is sleeved on the outside of the front end of the inner tube and partially extends forward beyond the inner tube. When sucking the diaphragm, the ventilation cavity, airway, air hole and concave cavity are in a negative pressure state, and the diaphragm is adsorbed by the suction cup under the action of the negative pressure. When the suction cup moves to the cup mouth of the cup body and places the diaphragm at the cup mouth, the diaphragm is pushed into the cup mouth and contacts the top side of the cup body. The edge of the diaphragm located at the outer periphery of the cup mouth is bent downward by the pressure of the shaping disc to form a cover-like structure. The shaping disc is used to pre-shape the diaphragm so that the edge of the diaphragm can be bent and deformed to hold the cup mouth, so that the diaphragm can move forward synchronously with the cup body, avoiding the diaphragm from being offset relative to the cup body due to its own inertia when moving forward with the cup body, so that the diaphragm is in a set position after heat sealing and shaping, which is beneficial to improving the appearance of the product and also to improving the heat sealing effect of the product.

[0016] 2. The cross-sectional shape of the shaping disc along the front-to-back direction is set to be a trumpet shape that is wide in the front and narrow in the back. The shape of the shaping disc is reasonably set so that the shaping disc can meet the pre-shaping requirements of the diaphragm within a certain size range, which is conducive to reasonably expanding the application range of the suction cup.

[0017] 3. The shaping disc is installed on the outside of the front end of the inner tube through a fastening sleeve. The fixing structure of the shaping disc is reasonably set to facilitate assembly while ensuring the structural stability of the shaping disc.

[0018] 4. The suction nozzle is provided with a through hole connecting the air hole and the concave cavity. When negative pressure is generated inside the suction cup to suck the diaphragm, the air in the concave cavity can quickly flow to the air hole through the through hole, which helps to improve the efficiency of negative pressure generation and thus improve the suction effect of the diaphragm. When the suction cup returns from the negative pressure state to the normal pressure state, the air flowing to the air hole can flow to the concave cavity through the through hole, which can promptly release the suction effect of the concave cavity on the diaphragm.

[0019] 5. The nozzle is connected to the inner tube through a threaded fit. The rear end of the nozzle is screwed into the threaded hole. A reasonable fixed fit structure between the nozzle and the inner tube is provided to facilitate assembly while effectively ensuring the connection strength between the nozzle and the inner tube.

[0020] 6. The housing adopts a split structure with a front shell and a rear shell, which simplifies the molding of the housing and the assembly of the inner tube and other components. A limiter is provided at the rear end of the inner tube. The limiter cooperates with the rear end of the shell to limit the movement of the inner tube in the front-to-back direction, preventing the inner tube from separating from the shell, which helps to improve the overall structural stability of the suction cup.

[0021] 7. The film-coating device provided by the present invention utilizes the aforementioned suction cups, which are spaced apart along the length of the dispensing tube. The venting cavities of the suction cups communicate with the airflow channels on the dispensing tube. When the suction cups are moved to the mouth of the cup body and the film is placed there, a shaping disk is used to pre-shape the film, allowing the edges of the film to bend and deform to grip the cup mouth. This allows the film to move forward synchronously with the cup body, preventing the film from shifting relative to the cup body due to its own inertia as it moves forward with the cup body. This ensures that the film remains in a set position after heat sealing and shaping, which improves the product's aesthetic appearance and heat sealing effect.

[0022] 8. The motor of the lifting assembly drives the rotating cage assembly up and down through the drive shaft, swing arm, pull rod, and lifting seat. When the rotating cage assembly rotates to the point where the suction cup faces upward, the lifting assembly drives the rotating cage assembly upward a certain distance so that the suction cup can smoothly absorb the membrane. When the rotating cage assembly rotates to the point where the suction cup faces downward, the lifting assembly drives the rotating cage assembly downward a certain distance so that the membrane can be stably pre-installed at the cup mouth of the cup body. The lifting assembly structure is rationally designed to meet the structural requirements for driving the rotating cage assembly up and down.

[0023] 9. The lifting seat is mounted on a vertical guide rod, which is beneficial to improving the stability of the lifting seat when it moves up and down, thereby improving the lifting stability of the cage assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of the suction cup along the front-to-back direction in Example 1;

[0025] Figure 2 This is an exploded view of part of the structure of the suction cup in Example 1;

[0026] Figure 3 This is a structural diagram of the film adding device in Example 1.

[0027] In the figure, 100-suction cup, 110-housing, 111-front housing, 112-rear housing, 113-ventilation cavity, 120-inner tube, 121-airway, 122-concave cavity, 123-positioning part, 124-threaded hole, 130-spring, 140-sucking nozzle, 141-air hole, 142-protrusion, 143-through hole, 150-vacuum breaking part, 151-sleeve hole, 160- Shaping disk, 170-fastening sleeve, 180-limiting sleeve, 181-flanging, 190-guide sleeve, 200-diaphragm, 300-frame, 410-bracket, 421-rotating power part, 422-distribution pipe, 430-air path assembly, 510-motor, 520-drive shaft, 530-swing arm, 540-pull rod, 550-lifting seat, 560-seat plate, 570-guide rod. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following terms indicating orientations or positional relationships, such as "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," are based solely on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0029] Example 1

[0030] like Figure 1 、 Figure 2 As shown, a suction cup 100 provided in the first embodiment of the present invention is used to suck up a diaphragm 200 and place the diaphragm 200 at the cup mouth of the cup body. The suction cup 100 includes a hollow outer shell 110, an inner tube 120 that can move back and forth and is arranged in the outer shell 110, and a spring 130 that is sleeved on the outside of the inner tube 120 and is used to drive the inner tube 120 to return. A ventilation cavity 113 is provided at the rear end of the outer shell 110, and the inner tube 120 is provided with an air channel 121 connected to the ventilation cavity 113. The suction cup 100 also includes a suction nozzle 140, a vacuum breaker 150 and a shaping disk 160. A concave cavity 122 is provided at the front end of the inner tube 120. The suction nozzle 140 and the vacuum breaker 150 are arranged in the concave cavity 122, and the vacuum breaker 150 is sleeved on the outside of the suction nozzle 140. The suction nozzle 140 is provided with an air hole 141 that is arranged through the front and back and connected to the air channel 121. The shaping disk 160 is sleeved on the outside of the front end of the inner tube 120 and partially extends forward beyond the inner tube 120. When the suction cup 100 places the diaphragm 200 at the mouth of the cup, the edge of the diaphragm 200 is bent and deformed downward under the shaping action of the shaping disk 160.

[0031] When the diaphragm is sucked in, the ventilation cavity, air passage, air hole and concave cavity are in a negative pressure state, and the diaphragm is sucked by the suction cup under the action of the negative pressure. When the suction cup moves to the cup mouth of the cup body and places the diaphragm at the cup mouth, the diaphragm is pushed into the cup mouth and contacts the top side of the cup body. The edge of the diaphragm located on the outer periphery of the cup mouth is bent downward by the pressure of the shaping disk to form a cover-like structure. The shaping disk is used to pre-shape the diaphragm so that the edge of the diaphragm can bend and deform to hold the cup mouth, so that the diaphragm can move forward synchronously with the cup body, avoiding the diaphragm from shifting relative to the cup body due to its own inertia when moving forward with the cup body, so that the diaphragm is in a set position after heat sealing and shaping, which is beneficial to improving the appearance of the product and also to improving the heat sealing effect of the product.

[0032] Combine Figure 2The cross-sectional shape of the shaping disc 160 along the front-to-back direction is preferably configured as a hollow trumpet shape that is wide in the front and narrow in the back. This allows the shaping disc 160 to meet the pre-shaping requirements of the diaphragm 200 within a certain size range, which helps to reasonably expand the scope of application of the suction cup 100. The front end of the inner tube 120 is provided with a positioning portion 123 having a trumpet-shaped outer wall. The shaping disc 160 is sleeved on the exterior of the positioning portion 123, and the front end of the shaping disc 160 protrudes forward from the front end surface of the inner tube 120. In this embodiment, the suction cup 100 also includes a fastening sleeve 170. The shaping disc 160 is sleeved on the exterior of the positioning portion 123 via the fastening sleeve 170, and the fastening sleeve 170 is fixedly connected to the inner tube 120. Specifically, the fastening sleeve 170 and the inner tube 120 are fixed by welding.

[0033] The suction nozzle 140 is connected to the inner tube 120 by a threaded fit. The inner tube 120 has a threaded hole 124 between the airway 121 and the cavity 122, which is adapted to fit the suction nozzle 140. The rear end of the suction nozzle 140 is screwed into the threaded hole 124 by a threaded fit. The vacuum breaker 150 has a sleeve hole 151 that is loosely fitted with the suction nozzle 140. The vacuum breaker 150 is mounted on the outside of the suction nozzle 140 and can be moved back and forth through the sleeve hole 151. The front end of the suction nozzle 140 is provided with a protrusion 142 to prevent the vacuum breaker 150 from detaching from the suction nozzle 140. The outer diameter of the protrusion 142 is larger than the inner diameter of the sleeve hole 151. The outer diameter of the vacuum breaker 150 and the inner diameter of the cavity 122 are loosely fitted, allowing the vacuum breaker 150 to move back and forth relative to the inner tube 120. When the diaphragm 200 is released, the vacuum breaker 150 slides downward relative to the suction nozzle 140 under its own weight, causing the diaphragm 200 to detach from the suction cup 100.

[0034] To enhance suction efficiency of membrane 200, nozzle 140 is provided with a through-hole 143 connecting air hole 141 with cavity 122. When negative pressure is generated within suction cup 100 to absorb membrane 200, air within cavity 122 can quickly flow toward air hole 141 through through-hole 143, effectively increasing the efficiency of generating negative pressure and, consequently, enhancing suction efficiency of membrane 200. When suction cup 100 returns from negative pressure to normal pressure, the airflow directed toward air hole 141 can flow toward cavity 122 through through-hole 143, effectively releasing the suction force exerted by cavity 122 on membrane 200.

[0035] In this embodiment, the outer shell 110 is hollow and includes a front shell 111 and a rear shell 112 connected together. The ventilation cavity 113 is formed by the front shell 111 and the rear shell 112. The rear end of the inner tube 120 is located in the ventilation cavity 113. In order to limit the movement distance of the inner tube 120 in the front-to-back direction, the rear end of the inner tube 120 is provided with a limiting portion protruding outward. The limiting portion cooperates with the rear end surface of the front shell 111 to limit the movement distance of the inner tube 120 in the front-to-back direction. Specifically, the rear end of the inner tube 120 is provided with a limiting sleeve 180. The top side of the limiting sleeve 180 is provided with a flange 181, and the flange 181 forms a limiting portion. When the inner tube 120 moves forward until the flange 181 contacts the rear end surface of the front shell 111, the inner tube 120 moves forward to its proper position, thereby preventing the inner tube 120 from excessively moving forward.

[0036] A guide sleeve 190 is sleeved on the front of the housing 120. This sleeve 190 abuts against a stepped surface on the inner wall of the front housing 111 to achieve axial positioning. A spring 130 is located within the front housing 111. The front end of the spring 130 abuts against a stepped surface on the outer wall of the inner tube 120, contacting the inner tube 120. The rear end of the spring 130 abuts against a stepped surface on the rear inner wall of the front housing 111 to achieve positioning. When the inner tube 120 moves rearward relative to the housing 110 under negative pressure, the spring 130 is compressed. When the diaphragm 200 is released, the spring 130, having recovered its deformation, drives the inner tube 120 forward relative to the housing 110 to reset.

[0037] Combine Figure 3 This embodiment provides a film coating device, comprising a frame 300, a rotatable cage assembly mounted on the frame 300, and a lifting assembly for driving the rotatable cage assembly upward and downward. The rotatable cage assembly comprises a horizontally mounted bracket 410, a rotating power member 421 for driving the bracket 410, and a plurality of distribution pipes 422 spaced circumferentially on the bracket 410. The distribution pipes 422 are horizontally mounted and have airflow channels. The film coating device also includes the aforementioned suction cups 100, which are spaced apart along the length of the distribution pipes 422. The ventilation cavities 113 of the suction cups 100 communicate with the airflow channels of the distribution pipes 422.

[0038] In this embodiment, the horizontal orientation of bracket 410 means that the length of bracket 410 is horizontal. Rotating power element 421 is preferably a rotary cylinder, which drives bracket 410 to rotate via a gear structure. An air circuit assembly 430 is provided at one end of bracket 410. Air circuit assembly 430 is connected to a pump for pumping gas. The pump can pump gas to switch the interior of suction cup 100 to a negative pressure state, and can also pump gas to restore the interior of suction cup 100 to a normal pressure state.

[0039] The lifting assembly includes a motor 510, a transmission shaft 520 driven by the motor 510, a swing arm 530 mounted on the transmission shaft 520, a pull rod 540 connected to the swing arm 530, and a lifting seat 550 connected to the pull rod 540. The transmission shaft 520 can be rotatably placed horizontally on the frame 300, and the bracket 410 can be rotatably mounted on the lifting seat 550. The motor 510 drives the cage assembly to rise and fall through the transmission shaft 520, the swing arm 530, the pull rod 540 and the lifting seat 550. In this embodiment, the transmission shaft 520 is arranged at the bottom of the rotating cage assembly, and the axial direction of the transmission shaft 520 is arranged parallel to the axial direction of the distribution pipe 422. Two swing arms 530 are provided and are respectively mounted on the two ends of the transmission shaft 520. Two lifting seats 550 are provided and are distributed at intervals along the axial direction of the transmission shaft 520. The two ends of the bracket 410 are rotatably mounted on the lifting seat 550 through bearings. Correspondingly, two pull rods 540 are provided, and the bottom end of the pull rod 540 is rotatably connected to the corresponding swing arm 530, and the top end of the pull rod 540 is rotatably connected to the corresponding lifting seat 550.

[0040] In order to improve the stability of the lifting assembly in driving the cage assembly to lift, the lifting assembly also includes a seat plate 560 fixed on the frame 300 and a guide rod 570 vertically arranged on the seat plate 560. The lifting seat 550 is sleeved on the guide rod 570, and the top end of the pull rod 540 passes through the seat plate 560 and is connected to the lifting seat 550.

[0041] This embodiment also provides a filling production line, including the film adding device described above, with a film storage device provided above the film adding device, and the devices at other workstations of the filling production line are specifically configured according to specific products.

[0042] The rotating power part 421 drives the bracket 410 to rotate. When the bracket 410 rotates until the suction cup 100 is facing upward and opposite to the film storage device, the lifting assembly drives the rotating cage assembly to move up a distance so that the suction cup 100 can smoothly absorb the membrane 200 under the action of negative pressure, and then drives the rotating cage assembly to move downward and reset. When the rotating power part 421 drives the bracket 410 to rotate so that the suction cup 100 is facing downward and opposite to the cup body, the diaphragm 200 is clamped between the suction cup 100 and the cup mouth of the cup body, and the lifting assembly drives the cage assembly to move down a certain distance. The diaphragm 200 is pushed into the cup mouth and contacts the top side of the cup body. The edge of the diaphragm 200 located on the outer periphery of the cup mouth is bent downward by the pressure of the shaping disk 160 to form a cover-like structure, thereby realizing the pre-shaping of the diaphragm 200, so that the edge of the diaphragm 200 can bend and deform to hold the cup mouth, so that the diaphragm 200 can move forward synchronously with the cup body, avoiding the situation where the diaphragm 200 is offset relative to the cup body due to its own inertia when moving forward with the cup body. After the pre-shaping is completed, the negative pressure state inside the suction cup 100 returns to the normal pressure state, and the spring 130 resets to make the inner tube 120 move down and press the diaphragm 200. The vacuum breaking component 150 moves down under the action of its own weight and presses the diaphragm 200 until the space between the diaphragm 200 and the front end of the suction cup 100 is filled with air and returns to the normal pressure state. The diaphragm 200 is completely separated from the suction cup 100, and then the lifting assembly drives the rotating cage assembly to move up and reset.

[0043] It is understandable that the distance that the front end of the shaping disk 160 exceeds the front end surface of the inner tube 120 can be set to a suitable distance value such as 3 mm, 4 mm, or 5 mm.

[0044] It is understandable that the fastening sleeve 170 may be omitted, and the shaping disc 160 may be directly fixed to the inner tube 120 .

[0045] It is understandable that the fastening sleeve 170 and the inner tube 120 can also be fixed by other reasonable structures such as a threaded fitting structure.

[0046] It is understandable that the suction nozzle 140 can also be fixedly connected to the inner tube 120 through other reasonable structures, such as interference fit.

[0047] It is understandable that the rotating power member 421 may also be a motor.

[0048] It is understandable that the gas circuit assembly 430 and the pump adopt existing technology.

[0049] It can be understood that the membrane storage device refers to the prior art.

[0050] It can be understood that other devices of the filling production line can refer to the prior art.

[0051] In addition to the above preferred embodiments, the present invention has other implementation modes. Those skilled in the art can make various changes and modifications based on the present invention. As long as they do not depart from the spirit of the present invention, they should all fall within the scope defined in the claims of the present invention.

Claims

1. A suction cup for sucking up a diaphragm and placing it on the mouth of a cup body. The suction cup comprises a hollow outer shell, an inner tube movable back and forth within the outer shell, and a spring sleeved on the outer portion of the inner tube for driving the inner tube to return to its original position. The rear end of the outer shell is provided with a vent cavity, and the inner tube is provided with an air passage communicating with the vent cavity. The suction cup is characterized in that: The suction cup further includes a suction nozzle, a vacuum breaker and a shaping disk. A concave cavity is provided at the front end of the inner tube. The suction nozzle and the vacuum breaker are arranged in the concave cavity, and the vacuum breaker is sleeved on the outside of the suction nozzle. The suction nozzle is provided with an air hole that is arranged through-through and connected to the airway. The shaping disk is sleeved on the outside of the front end of the inner tube and partially extends forward beyond the inner tube. When the suction cup places the diaphragm at the mouth of the cup, the edge of the diaphragm is bent and deformed downward under the shaping action of the shaping disk. The vacuum breaker is provided with a sleeve hole that fits the gap with the suction nozzle. The vacuum breaker is mounted on the outside of the suction nozzle through the sleeve hole and can move back and forth. The front end of the suction nozzle is provided with a protrusion to prevent the vacuum breaker from separating from the suction nozzle. The outer diameter of the protrusion is larger than the inner diameter of the sleeve hole. The suction nozzle is provided with a through hole for connecting the air hole and the concave cavity. When negative pressure is generated inside the suction cup to suck the diaphragm, the air in the concave cavity quickly flows to the air hole through the through hole. After the pre-shaping is completed, the negative pressure state inside the suction cup returns to normal pressure, the spring resets the inner tube to move down and press the diaphragm, and the vacuum breaker moves down under the action of its own weight to press the diaphragm until the space between the diaphragm and the front end of the suction cup is filled with air and returns to normal pressure, and the diaphragm is completely separated from the suction cup.

2. The suction cup according to claim 1, wherein The cross-section of the shaping disc along the front-to-back direction is in the shape of a hollow trumpet that is wide at the front and narrow at the back.

3. The suction cup according to claim 1, wherein The suction nozzle comprises a fastening sleeve, and the shaping disc is sleeved on the outside of the front end of the inner tube through the fastening sleeve, and the fastening sleeve is fixedly connected to the inner tube.

4. The suction cup according to claim 1, wherein The suction nozzle is connected to the inner tube through threaded fitting. The inner tube is provided with a threaded hole matching with the suction nozzle between the airway and the concave cavity. The rear end of the suction nozzle is screwed into the threaded hole.

5. The suction cup according to claim 1, wherein The outer shell includes a front shell and a rear shell connected together to form a ventilation cavity. The rear end of the inner tube is located in the ventilation cavity and an outwardly protruding limiting portion is provided on the outer wall. The limiting portion cooperates with the rear end surface of the front shell to limit the movement distance of the inner tube in the front and rear directions.

6. A film coating device comprising a frame, a rotatable cage assembly mounted on the frame and capable of being raised and lowered, and a lifting assembly for driving the rotatable cage assembly to rise and fall, wherein the rotatable cage assembly comprises a horizontally mounted bracket, a rotating power member for driving the bracket to rotate, and a plurality of distribution pipes distributed on the bracket at intervals along the circumference, wherein the distribution pipes are horizontally mounted and provided with air flow channels, characterized in that: The film applying device further comprises the suction cup according to any one of claims 1 to 5, wherein a plurality of the suction cups are spaced apart along the length direction of the distribution pipe, and the ventilation cavity of the suction cup is connected to the air flow channel.

7. The film coating device according to claim 6, characterized in that: The lifting assembly includes a motor, a transmission shaft driven by the motor, a swing arm sleeved on the transmission shaft, a pull rod connected to the swing arm, and a lifting seat connected to the pull rod. The transmission shaft can be rotatably placed horizontally on the frame, and the bracket can be rotatably mounted on the lifting seat. The motor drives the cage assembly to rise and fall through the transmission shaft, swing arm, pull rod and lifting seat.

8. The film applying device according to claim 7, characterized in that: The lifting assembly comprises a seat plate fixed on the frame and a guide rod vertically arranged on the seat plate, and the lifting seat sleeve is arranged on the guide rod.

9. A filling production line, characterized in that: The invention comprises the film adding device according to any one of claims 6 to 8.

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