A PET aerosol can valve outer grab type sealing machine

Abstract

The application belongs to the technical field of sealing machines, and particularly discloses a PET aerosol can valve outer gripping type sealing machine which comprises a rack structure, a telescopic air cylinder connected to the rack structure, an outer cover fixed to the working end of the telescopic air cylinder, inner covers distributed in the outer cover, a transmission structure fixed in the outer cover, the transmission structure driving the inner covers to rotate in the outer cover, a pressing block distributed in the inner cover, a sealing ring fixed between the pressing block and the inner wall of the inner cover, the inner cover driving the pressing block to press on the valve cup of the PET aerosol through the sealing ring, and an outer gripping piece connected to the inner edge of the opening of the inner cover, wherein the outer gripping piece comprises a bent strip, an air connecting piece, an air inlet hole, a cow eye wheel, a connecting spring and a mounting ring. The PET aerosol can valve cup and the can opening can be reliably sealed through optimization of the mechanical structure and the pneumatic control mode, and the sealing quality and the production efficiency are improved.

Description

Technical Field

[0001] This invention belongs to the field of sealing machine technology, and specifically discloses a PET aerosol can valve external gripping sealing machine. Background Technology

[0002] Aerosol cans are widely used in daily chemicals, pharmaceuticals, food, and other fields, and the sealing quality of their can openings directly affects the product's performance and safety. Currently, the main method for sealing aerosol can openings is valve cup pressing, where a sealing device presses the valve cup onto the can opening to achieve a seal. Existing sealing equipment typically includes a frame, a telescopic cylinder, and a pressing head. The telescopic cylinder drives the pressing head to apply pressure to the valve cup, causing it to deform and fit tightly against the can opening. However, this type of equipment was primarily designed for metal cans and has several shortcomings when directly applied to PET aerosol cans.

[0003] First, PET material has high elasticity and low rigidity, making it far more sensitive to pressure during the sealing process than metal materials. Traditional sealing equipment often uses rigid sealing heads, which lack effective buffering mechanisms when driven by telescopic cylinders. This easily leads to irreversible deformation or even rupture of the valve cup or can opening due to excessive instantaneous pressure, severely impacting product yield. Although some existing equipment incorporates spring buffer elements between the sealing head and the cylinder, these buffer structures have limited stroke and linearly varying buffering force, making them ill-suited to the non-linear force requirements during the sealing of PET aerosol cans.

[0004] Secondly, existing sealing equipment uses a relatively simple method for pressing valve cups, typically relying solely on continuous vertical downward pressure to connect the valve cup to the can opening. During the actual pressing process, localized gaps easily appear between the lower edge of the valve cup and the valve opening of the can. Simply relying on vertical pressing makes it difficult to ensure the lower edge of the valve cup completely adheres to the can opening surface, resulting in insufficient sealing. To overcome this problem, some equipment uses a rotary roller pressing method, where the edge of the valve cup is rolled by rotating the pressing head. However, such equipment has a complex structure, with the rotary drive mechanism and the vertical pressing mechanism operating independently. The precision of their coordinated operation is difficult to guarantee, and the problem of uneven force on the valve cup persists.

[0005] Secondly, existing sealing equipment generally lacks the ability to monitor and control the pressing process in real time. Sealing quality often relies on the operator's experience or subsequent sampling inspections, making it impossible to monitor and dynamically adjust the deformation state of the valve cup and the pressing strength during the pressing process. For PET aerosol cans, the material properties of different batches of cans and valve cups vary to some extent. If process parameters cannot be adaptively adjusted according to the actual pressing state, the stability and consistency of sealing quality cannot be guaranteed.

[0006] Furthermore, with the continuous expansion of applications for PET aerosol cans, some products have placed higher demands on the connection strength and sealing level between the valve cup and the can opening, requiring large-area external gripping and pressing. However, the pressing head structure of existing sealing equipment is fixed, and its pressing range and pressing angle are not adjustable, making it unable to adapt to the diverse production needs of different can sizes and different sealing requirements. Summary of the Invention

[0007] In view of this, the purpose of this invention is to propose an external gripping sealing machine for PET aerosol can valves, which aims to achieve reliable sealing between the valve cup and the can opening of PET aerosol cans by optimizing the mechanical structure and pneumatic control method, thereby improving sealing quality and production efficiency.

[0008] To achieve the above objectives, the present invention provides a PET aerosol can valve external gripping sealing machine, including a frame structure, a telescopic cylinder connected to the frame structure, an outer cover fixed to the working end of the telescopic cylinder, an inner cover distributed inside the outer cover, the telescopic cylinder driving the inner cover to adjust the working height through the outer cover, a transmission structure fixed inside the outer cover, the transmission structure driving the inner cover to rotate inside the outer cover; In the above technical solution, further, the inner cover has pressing blocks distributed inside, and a sealing ring is fixed between the pressing blocks and the inner wall of the inner cover. The inner cover drives the pressing blocks to press against the valve cup of the PET aerosol through the sealing ring. An outer gripper is connected to the inner edge of the opening of the inner cover. In the above technical solution, the outer gripper further includes a bending strip, an air receiving component, an air inlet, a bullseye wheel, a connecting spring, and a mounting ring; In the above technical solution, the mounting ring is further fixed to the inner wall of the inner cover, the bending strips are evenly distributed in the inner cavity of the inner cover with the pressing block as the center, the hinge is connected between the upper end of the bending strip and the mounting ring, and is used to drive the bending strip to rotate on the mounting ring, the air receiving component is connected between the bending strip and the inner cover, the connecting spring is connected between the bending strip and the inner cover, the connecting spring cooperates with the air receiving component to support the bending strip, the bullseye wheel is fixed to the lower fold of the bending strip, and is used to roll and press the outer edge of the lower part of the valve cup, the pressing block is connected to the air supply structure through the inner cavity formed by the sealing ring and the inner cover, and a pressure detector is fixed on the inner cover to detect the air pressure inside the inner cover.

[0009] In the above technical solution, the air supply structure further includes an external air pump, an air supply pipe, and a telescopic pipe; In the above technical solution, the air supply pipe is further fixed on the outer cover, and the exhaust end of the outer cover is fixed with a telescopic pipe, which is connected to the inner cavity of the inner cover.

[0010] In the above technical solution, the air receiving component further includes an annular cavity, an air inlet, a sliding column, a sleeve, and a piston block; In the above technical solution, further, the annular cavity is opened at the lower part of the inner cover, the air inlet is opened at equal intervals on the inner cover with the pressure block as the center, the inner cavity of the inner cover is connected to the inner cavity of the annular cavity through the air inlet, the sleeve is fixed at equal intervals on the inner edge of the inner cover with the pressure block as the center, the inner cavity of the sleeve is connected to the inner cavity of the annular cavity, the sliding column passes through the sleeve, the end of the sliding column away from the sleeve is rotatably connected to the bending strip, the piston block is fixed at the end of the sliding column inserted into the sleeve, the piston block slides inside the sleeve, and the end of the sleeve away from the sliding column is connected to the inner cavity of the annular cavity through the hose.

[0011] In the above technical solution, the transmission structure further includes a columnar rod, a transmission motor, a transmission gear, and a driven gear; In the above technical solution, the columnar rod is further fixed in the middle of the outer wall of the inner cover, the driven gear is fixed at the upper end of the columnar rod, the transmission motor is distributed on one side of the driven gear, the transmission gear is fixed at the output end of the transmission motor, and the transmission gear and the driven gear mesh.

[0012] In the above technical solution, the transmission motor is further fixed to the inner wall of the outer cover by a fixed seat. The transmission motor drives the driven gear to rotate through the transmission gear. The rotation angle of the output shaft of the transmission motor is an acute angle. The transmission motor drives the driven gear on the inner cover to rotate through the transmission gear, thereby realizing the rotation of the inner cover on the sealing ring.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides an elastic sealing ring between the inner cover and the pressure block, allowing the pressure block to undergo a buffer displacement relative to the inner cover when the telescopic cylinder is pressed down. This buffer structure utilizes the elastic deformation of the sealing ring to absorb instantaneous impact forces, effectively preventing irreversible damage such as indentations or cracks in the valve cup or PET can opening caused by excessive cylinder stroke or pressure fluctuations. It is particularly suitable for sealing PET aerosol cans made of softer materials.

[0014] 2. This invention utilizes a combination of a bending strip, a bullseye wheel, an air inlet, and a connecting spring. During initial pressing, a sudden increase in air pressure within the inner cover drives the bullseye wheel to rapidly strike the lower edge of the valve cup, causing localized deformation and initial contact with the can opening. Subsequently, continuous air supply keeps the bullseye wheel pressing against the outer edge of the valve cup, achieving a secondary pressing. This two-step method solves the problem of localized gaps easily generated by traditional single vertical pressing, significantly improving the uniformity and reliability of the seal between the valve cup and the can opening.

[0015] 3. This invention features a pressure detector fixed to the inner cover, capable of real-time monitoring of internal cavity pressure changes and transmitting the signal to an external computer. By analyzing the pressure data, the downward displacement and pressing intensity of the bullseye wheel can be indirectly determined, thereby dynamically adjusting the air supply strategy and pressing stroke. This closed-loop monitoring method overcomes the shortcomings of traditional equipment that relies on manual experience or post-production sampling, ensuring that each batch of products meets the set sealing standards, significantly improving production stability and product qualification rate.

[0016] 4. In a preferred embodiment, this invention adds a rotary transmission structure consisting of a columnar rod, a drive motor, a drive gear, and a driven gear. This structure can drive the inner cover and the bending strip to rotate as a whole at a certain acute angle after the secondary pressing is completed, causing the bullseye wheel to roll along the outer edge of the valve cup. This rolling action ensures that the lower edge of the valve cup completely and evenly fits against the tank opening, meeting high-standard sealing requirements. Simultaneously, by controlling the rotation angle and air supply pressure, it can flexibly adapt to the production needs of different tank sizes and different sealing levels, significantly improving the equipment's versatility and process adjustment capabilities. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view showing the connection between the sealing ring, the outer cover, and the inner cover in this invention. Figure 3 This is a structural diagram showing the connection between the inner cover and the outer cover in this invention via a sealing ring; Figure 4 This is a schematic diagram showing the distribution of the telescopic tube, inner cover, and outer cover in this invention; Figure 5 This is a diagram showing the connection structure between the transmission gear and the driven gear in this invention; Figure 6 This is a schematic diagram showing the distribution of the pressure blocks inside the inner cover component in this invention; Figure 7 for Figure 4 Enlarged view of B in the middle; Figure 8 for Figure 3 Enlarged view of A in the middle; Figure 9 for Figure 4 A magnified view of C.

[0018] 1. Mounting frame; 11. Testing structure; 12. Telescopic cylinder; 13. Column; 2. Outer cover; 21. Inner cover; 22. Air supply pipe; 23. Sealing ring; 24. Pressing block; 25. Drive motor; 26. Drive gear; 27. Driven gear; 28. Air pressure detector; 29. ​​Sealing ring; 210. Telescopic tube; 3. Bending strip; 31. Annular cavity; 32. Air inlet; 33. Sliding column; 34. Sleeve; 35. Piston block; 36. Bullseye wheel; 37. Connecting spring; 38. Mounting ring; 39. Hinge; 4. Column rod. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0021] Example 1: Please refer to Figures 1-9 As shown, the present invention provides a technical solution: This invention is a PET aerosol can valve external gripping sealing machine, including a frame structure, a telescopic cylinder 12 connected to the frame structure, an outer cover 2 fixed to the working end of the telescopic cylinder 12, an inner cover 21 distributed inside the outer cover 2, and a transmission structure fixed inside the outer cover 2. The inner cover 21 has pressing blocks 24 distributed inside, and a sealing ring 29 is fixed between the pressing blocks 24 and the inner wall of the inner cover 21. An outer gripper is connected to the inner edge of the opening of the inner cover 21. The outer gripper includes a bending strip 3, an air inlet 32, an eyelet wheel 36, a connecting spring 37, and a mounting ring 38; The mounting ring 38 is fixed to the inner wall of the inner cover 21. The bent strips 3 are evenly distributed in the inner cavity of the inner cover 21 with the pressing block 24 as the center. The hinge 39 is connected between the upper end of the bent strip 3 and the mounting ring 38. The air connector is connected between the bent strip 3 and the inner cover 21. The connecting spring 37 is connected between the bent strip 3 and the inner cover 21. The bullseye wheel 36 is fixed to the lower fold of the bent strip 3.

[0022] The pressure block 24 moves up and down on the inner cover 21 via the sealing ring 29. The pressure block 24 is connected to the air supply structure through the inner cavity formed by the sealing ring 29 and the inner cover 21. The sealing ring 29 is elastic and preferably made of silicone rubber with a Shore hardness of 40 to 60 degrees and a compression deformation rate of not less than 20%. The sealing ring 29 is an annular seal embedded between the outer periphery of the pressure block 24 and the inner wall of the inner cover 21. When the pressure block 24 moves upward, the sealing ring 29 undergoes elastic deformation but still maintains a sealing contact.

[0023] A sealing ring 23 is rotatably mounted on the outer edge of the opening of the inner cover 21. The sealing ring 23 is fixed on the inner edge of the opening of the outer cover 2. The sealing ring 23 seals the gap between the outer cover 2 and the inner cover 21. A pressure detector 28 is fixed on the inner cover 21.

[0024] The air supply structure includes an external air pump, an air supply pipe 22, and a telescopic pipe 210; The air supply pipe 22 is fixed on the outer cover 2. The exhaust end of the outer cover 2 is fixed with a telescopic pipe 210. The telescopic pipe 210 is connected to the inner cavity of the inner cover 21. Both the air supply pipe 22 and the telescopic pipe 210 are elastic.

[0025] The air receiving component includes an annular cavity 31, an air inlet 32, a sliding column 33, a sleeve 34, and a piston block 35; An annular cavity 31 is formed at the lower part of the inner cover 21. An air inlet 32 ​​is formed at equal intervals on the inner cover 21 with the pressure block 24 as the center. The inner cavity of the inner cover 21 is connected to the inner cavity of the annular cavity 31 through the air inlet 32. A sleeve 34 is fixed at equal intervals on the inner edge of the inner cover 21 with the pressure block 24 as the center. The inner cavity of the sleeve 34 is connected to the inner cavity of the annular cavity 31. A sliding column 33 passes through the sleeve 34. The end of the sliding column 33 away from the sleeve 34 is rotatably connected to the bending strip 3. A piston block 35 is fixed at the end of the sliding column 33 that is inserted into the sleeve 34. The piston block 35 slides inside the sleeve 34.

[0026] One end of the sleeve 34 away from the sliding column 33 is connected to the inner cavity of the annular cavity 31 through a hose. The air connector cooperates with the spring 37 to support the bending strip 3. The bending strip 3 rotates on the mounting ring 38 with the hinge 39 as the center. In actual use, the PET aerosol can is placed on the mounting frame 1 in advance, and then the valve cup is placed on the can opening. Then the telescopic cylinder 12 is started. The telescopic cylinder 12 can drive the pressing block 24 on the inner cover 21 to abut against the valve cup through the outer cover 2, thereby achieving the sealing of the can opening of the can by the valve cup. When the pressure block 24 presses against the valve cup of the tank, the pressure block 24 is connected to the inner cover 21 through the sealing ring 29. The pressure block 24 can move upward on the inner cover 21 through the sealing ring 29, thereby realizing that the pressure block 24 can be buffered on the inner cover 21, and preventing the pressure block 24 from damaging the valve cup on the tank when the telescopic cylinder 12 drives the inner cover 21 to move downward through the outer cover 2. The external end of the air supply pipe 22 is connected to an external air pump. The output end of the external air pump and the air supply pipe 22 are connected to a control valve. When the pressure block 24 presses down on the valve cup on the tank, the control valve is closed and the external air pump does not work. This can prevent the pressure block 24 from causing the gas inside the inner cover 21 to flow back into the external air pump, thereby preventing the external air pump from being damaged. When the pressing block 24 on the inner cover 21 instantly presses the valve cup against the tank, the air pressure inside the inner cover 21 increases instantly. Then, the gas inside the inner cover 21 can pass through the air inlet 32 ​​and enter the interior of the annular cavity 31. Then, the gas inside the annular cavity 31 can enter the interior of the sleeve 34. The gas inside the sleeve 34 can drive the sliding column 33 to extend through the piston block 35, thereby driving the bending strip 3 to rotate upward around the hinge 39, so that the bullseye wheel 36 on the bending strip 3 can strike the outer edge of the lower part of the valve cup, thus achieving the initial pressing of the valve cup and the valve port of the tank. It should be noted that when the valve cup is pressed against the valve opening of the tank, a gap appears between the lower edge of the valve cup and the valve opening of the tank. When the bullseye wheel 36 on the bending strip 3 strikes the lower outer edge of the valve cup, it will not cause the valve opening of the tank to deform. This design is to enable the lower edge of the valve cup to deform quickly, thereby achieving the initial pressing of the lower edge of the valve cup against the valve opening of the tank, so that the bullseye wheel 36 can drive the lower edge of the valve cup to press against the valve opening of the tank. When the lower edge of the valve cup is initially pressed against the valve opening of the can, the upward-flipping bending strip 3 can stretch the connecting spring 37, thereby enabling the connecting spring 37 to store power. Under the action of its own restoring force, the connecting spring 37 can drive the bending strip 3 away from the valve cup, thereby enabling the bullseye wheel 36 to move away from the valve cup after being struck, thus preventing the vibration generated by the valve cup due to the strike from being continuously transmitted to the bullseye wheel 36, ensuring that the bullseye wheel 36 will not be damaged by the vibration. When the bullseye wheel 36 strikes the valve cup, the working end of the telescopic cylinder 12 drives the pressing block 24 on the inner cover 21 through the outer cover 2 to continuously press down on the valve cup, thereby moving the part of the bullseye wheel 36 that contacts the valve cup downward. At this time, the air pressure detector 28 detects the air pressure inside the inner cover 21. The air pressure detector 28 can transmit the detected value to an external computer. The external computer has an analysis program installed inside, and then analyzes the distance the bullseye wheel 36 moves downward through the information transmitted by the air pressure detector 28. When the bullseye wheel 36 moves downward, it means that the contact part between the bullseye wheel 36 and the valve cup is below the part of the valve cup that is being struck. When the valve cup is struck, the lower part of the striking point of the valve cup will tilt upward. As the bullseye wheel 36 moves downward, the bullseye wheel 36 can squeeze the tilted part of the valve cup, thereby ensuring stable contact between the bullseye wheel 36 and the part of the valve cup that is about to be pressed together, and ensuring that the part of the valve cup that is subsequently pressed together does not separate from the bullseye wheel 36. When the part of the valve cup about to be pressed comes into contact with the bullseye wheel 36, the external air pump supplies air to the inside of the inner cover 21 through the air supply pipe 22 and the telescopic pipe 210. The air supply pressure of the external air pump is preferably 0.3 to 0.6 MPa. At this time, the air pressure in the inner cavity formed by the inner cover 21, the sealing ring 29, and the pressure block 24 increases. Then, the gas inside the inner cover 21 passes through the air inlet 32 ​​and enters the interior of the annular cavity 31. Then, the gas inside the annular cavity 31 can enter the interior of the sleeve 34. The gas inside the sleeve 34 can drive the sliding column 33 to extend through the piston block 35, thereby driving the bending strip 3 to rotate upward around the hinge 39, so that the bullseye wheel 36 on the bending strip 3 abuts against the part of the valve cup being pressed, and the bending strip 3 achieves secondary external gripping and pressing of the valve cup on the can opening. The bullseye wheel 36 has a universal ball bearing structure, including a housing and balls rotatably disposed in the housing. The balls protrude from the surface of the housing and are used to roll and contact the outer edge of the valve cup. The preferred material for the balls is a wear-resistant metal. The external gripper refers to the component that applies pressure to the valve cup from the outside through the bending strip 3, in order to distinguish it from the pressure block 24 which applies pressure directly from above the valve cup.

[0027] Depending on the different sealing requirements of existing PET aerosol cans, some PET aerosol cans require a large-area external gripping and pressing when connecting the valve cup and the can opening. In order to meet these requirements, the following structure is proposed. Example 2: Please refer to Figures 1-9 As shown, based on Embodiment 1, the present invention provides a technical solution: The transmission structure includes a column rod 4, a transmission motor 25, a transmission gear 26, and a driven gear 27; The columnar rod 4 is fixed in the middle of the outer wall of the inner cover 21. The axis of the columnar rod 4 and the spherical distribution of the inner cover 21 are on the same straight line. The driven gear 27 is fixed at the upper end of the columnar rod 4. The drive motor 25 is distributed on one side of the driven gear 27. The drive gear 26 is fixed at the output end of the drive motor 25. The drive gear 26 and the driven gear 27 mesh.

[0028] The fixed end of the drive motor 25 is fixed to the inner wall of the outer cover 2. The drive motor 25 drives the driven gear 27 to rotate through the drive gear 26. The rotation angle of the output shaft of the drive motor 25 is an acute angle.

[0029] The frame structure includes a mounting frame 1, a detection structure 11 and a column 13. The detection structure 11 is a vision detector used to detect the connection strength between the valve cup and the can opening. The detection structure 11 transmits the detection information to the internal computer of an external computer, which makes it easier for staff to understand the connection strength between the valve cup and the can opening. The detection structure 11 and the column 13 are both fixed on the mounting frame 1. The column 13 is fixed on one side of the detection structure 11, and the telescopic cylinder 12 is fixed on the column 13. This implementation scheme is based on Example 1. After the bullseye wheel 36 presses against the valve cup on the can opening for the second time, the air pressure detector 28 is used to detect the air pressure value inside the inner cover 21 in real time, and converts the detected air pressure signal into an electrical signal and transmits it to an external computer (or PLC controller). The external computer has a built-in comparison and judgment program to compare the real-time air pressure value with the preset air pressure value. When the real-time air pressure value reaches the preset value, the external computer determines that the pressing strength of the bullseye wheel 36 against the valve cup has met the requirements of roller sealing, and then sends a control signal to start the drive motor 25 to work; if the real-time air pressure value does not reach the preset value, the external computer adjusts the air supply pressure of the external air pump through the control valve to raise the air pressure inside the inner cover 21 to the preset value. The preset air pressure value is determined through calibration experiments: using a force sensor placed below the pressure block 24, the actual pressure values ​​measured by the force sensor under different air supply pressures are recorded, and a "supply pressure-pressure" relationship curve is plotted to establish a mapping table. According to Pascal's law, the relationship between the cylinder output force F and the supply pressure P is F=η×P×A, where η is the comprehensive efficiency coefficient (taken as 0.5~0.85), and A is the effective area of ​​the piston. According to the sealing requirements of different specifications of PET aerosol cans, the preset pressure range is 100N~500N, and the corresponding preset air supply pressure range is 0.15MPa~0.40MPa. The specific values ​​should be determined through calibration experiments based on the can material, wall thickness, and valve cup specifications. The output shaft of the drive motor 25 drives the driven gear 27 to rotate forward through the drive gear 26. Then, the output shaft of the drive motor 25 drives the driven gear 27 to rotate backward through the drive gear 26, thereby realizing the rolling of the bullseye wheel 36 on the pressing part of the valve cup. It should be noted that the angle at which the drive gear 26 drives the driven gear 27 to rotate is an acute angle. It should be noted that there are at least five equally spaced bending strips 3 connected to the mounting ring 38. When the drive motor 25 drives the bullseye wheel 36 to rotate between 30 degrees and 90 degrees through the bending strips 3, the outer edge of the lower part of the valve cup can be completely rolled by the bullseye wheel 36, thereby achieving a complete seal connection of the valve cup to the mouth of the tank, and thus achieving an absolute seal between the valve cup and the tank. The rotation angle of the output shaft of the drive motor 25 is between 30 degrees and 90 degrees, and its rotation direction is reciprocating. After the valve cup seals the opening of the tank, the external computer-controlled drive motor 25 stops working, and then the telescopic cylinder 12 resets, and the external pump stops supplying air to the inside of the inner cover 21.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A PET aerosol can valve external gripping sealing machine, characterized in that, Includes a frame structure, on which a telescopic cylinder (12) is connected, and an outer cover (2) is fixed at the working end of the telescopic cylinder (12). An inner cover (21) is distributed inside the outer cover (2), and a transmission structure is fixed inside the outer cover (2). The inner cover (21) has pressing blocks (24) distributed inside, and a sealing ring (29) is fixed between the pressing blocks (24) and the inner wall of the inner cover (21). An outer gripper is connected to the inner edge of the opening of the inner cover (21). The outer gripper includes a bending strip (3), an air inlet, an air inlet (32), a bullseye wheel (36), a connecting spring (37), and a mounting ring (38); The mounting ring (38) is fixed to the inner wall of the inner cover (21). The bending strip (3) is evenly distributed in the inner cavity of the inner cover (21) with the pressing block (24) as the center. The hinge (39) is connected between the upper end of the bending strip (3) and the mounting ring (38). The air connector is connected between the bending strip (3) and the inner cover (21). The connecting spring (37) is connected between the bending strip (3) and the inner cover (21). The bullseye wheel (36) is fixed to the lower fold of the bending strip (3).

2. The PET aerosol can valve external gripping sealing machine according to claim 1, characterized in that, The pressure block (24) moves up and down on the inner cover (21) through the sealing ring (29). The pressure block (24) is connected to the air supply structure through the inner cavity formed by the sealing ring (29) and the inner cover (21). The sealing ring (29) is elastic.

3. The PET aerosol can valve external gripping sealing machine according to claim 1, characterized in that, The outer edge of the opening of the inner cover (21) is rotatably covered with a sealing ring (23), which is fixed to the inner edge of the opening of the outer cover (2). The sealing ring (23) seals the gap between the outer cover (2) and the inner cover (21). A pressure detector (28) is fixed on the inner cover (21).

4. The PET aerosol can valve external gripping sealing machine according to claim 2, characterized in that, The air supply structure includes an external air pump, an air supply pipe (22), and a telescopic pipe (210). The air supply pipe (22) is fixed on the outer cover (2), and the exhaust end of the outer cover (2) is fixed with a telescopic pipe (210). The telescopic pipe (210) is connected to the inner cavity of the inner cover (21), and both the air supply pipe (22) and the telescopic pipe (210) are elastic.

5. The PET aerosol can valve external gripping sealing machine according to claim 1, characterized in that, The air receiving component includes an annular cavity (31), an air inlet (32), a sliding column (33), a sleeve (34), and a piston block (35). The annular cavity (31) is located at the lower part of the inner cover (21). The air inlet (32) is located on the inner cover (21) at equal intervals with the pressure block (24) as the center. The inner cavity of the inner cover (21) is connected to the inner cavity of the annular cavity (31) through the air inlet (32). The sleeve (34) is fixed at equal intervals with the pressure block (24) as the center. The inner cavity of the sleeve (34) is connected to the inner cavity of the annular cavity (31). The sliding column (33) passes through the sleeve (34). The end of the sliding column (33) away from the sleeve (34) is rotatably connected to the bending strip (3). The piston block (35) is fixed at the end of the sliding column (33) inserted into the sleeve (34). The piston block (35) slides inside the sleeve (34).

6. The PET aerosol can valve external gripping sealing machine according to claim 5, characterized in that, The end of the sleeve (34) away from the sliding column (33) is connected to the inner cavity of the annular cavity (31) through a hose. The air inlet is connected to the spring (37) to support the bending strip (3). The bending strip (3) rotates on the mounting ring (38) with the hinge (39) as the center.

7. The PET aerosol can valve external gripping sealing machine according to claim 1, characterized in that, The transmission structure includes a column rod (4), a transmission motor (25), a transmission gear (26), and a driven gear (27). The columnar rod (4) is fixed in the middle of the outer wall of the inner cover (21). The axis of the columnar rod (4) and the spherical distribution of the inner cover (21) are on the same straight line. The driven gear (27) is fixed at the upper end of the columnar rod (4). The drive motor (25) is distributed on one side of the driven gear (27). The drive gear (26) is fixed at the output end of the drive motor (25). The drive gear (26) and the driven gear (27) mesh.

8. A PET aerosol can valve external gripping sealing machine according to claim 7, characterized in that, The fixed end of the drive motor (25) is fixed to the inner wall of the outer cover (2). The drive motor (25) drives the driven gear (27) to rotate through the drive gear (26). The rotation angle of the output shaft of the drive motor (25) is an acute angle.

9. A PET aerosol can valve external gripping sealing machine according to claim 1, characterized in that, The frame structure includes a mounting frame (1), a detection structure (11), and a column (13). The detection structure (11) and the column (13) are both fixed on the mounting frame (1). The column (13) is fixed on one side of the detection structure (11), and the telescopic cylinder (12) is fixed on the column (13).

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