A blister forming machine

Abstract

The application relates to the field of plastic uptake forming technology, and discloses a plastic uptake forming machine, which comprises a base, a feeding roll is sequentially arranged between two groups of support plates, two groups of cleaning cylinders are arranged above and below the feeding roll, and an upper cleaning roller and a lower cleaning roller are arranged above and below the two groups of cleaning cylinders; a frame is arranged on the top of the two groups of supports, a clamping assembly is arranged on the top of the frame, abutting assemblies are connected to the two sides of the clamping assembly, and a lifting plastic uptake mold base is slidely connected between the two groups of supports; the upper cleaning roller and the lower cleaning roller can simultaneously physically clean the upper and lower surfaces of the plastic roll, and effectively scrape off dust and impurities on the surfaces. The upper cleaning roller drives the gas collecting assembly to work, so that the cleaning cylinder blows out airflow to clean the upper and lower end surfaces of the plastic roll. When the lifting plastic uptake mold base is lifted, the clamping assembly quickly clamps the plastic roll, and the air suction pipeline system simultaneously performs plastic uptake forming operation, so that the working efficiency is improved, the operation time is reduced, and the rhythm requirement of large-scale production is met.

Description

TECHNICAL FIELD

[0001] The application relates to the field of plastic suction forming technology, and particularly relates to a plastic suction forming machine. BACKGROUND

[0002] In the medical industry, plastic suction forming technology is widely used in medical consumables and medicine packaging fields, and provides important support for the development of the medical industry. However, the plastic suction forming machine used in the current medical field has a series of problems, which seriously restricts the quality and production efficiency of medical products.

[0003] Medical products are directly related to the health of patients, and the cleanliness requirement is extremely high. When the traditional plastic suction forming machine cleans the plastic roll, the cleaning means is single, and it is difficult to comprehensively and deeply clean the upper and lower surfaces of the roll. During the production, transportation and storage of the plastic roll, a large amount of dust, impurities and oil stains will be attached to the surface of the plastic roll. If these pollutants are not effectively removed before plastic suction forming, defects such as black spots and bubbles will be easily formed on the surface of the plastic product, which seriously affects the appearance quality and performance of the product and reduces the market competitiveness of the product.

[0004] Some plastic suction forming machines use independent driving systems for each functional component during plastic suction forming, and do not have coordinated cooperation. For example, there is no effective linkage mechanism between the actions of clamping the plastic roll, plastic suction forming and demolding, which leads to a complicated operation process, low production efficiency and difficulty in meeting the needs of large-scale industrial production. Therefore, we provide a plastic suction forming machine. SUMMARY

[0005] The application aims to provide a plastic suction forming machine to solve the problems in the background.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme.

[0007] A plastic suction forming machine comprises a base, the front part of the base is provided with support plates on both sides, a feeding roll is sequentially arranged between the two groups of support plates, upper and lower cleaning cylinders are sequentially arranged between the two groups of support plates, and upper and lower cleaning rollers are arranged in an upper and lower distribution manner;

[0008] The middle part of the base is provided with supports on both sides, the top of the two groups of supports is provided with a frame, the top of the frame is provided with a clamping assembly, the clamping assembly is connected with abutting assemblies on both sides, and a lifting plastic suction mold base is slidely connected between the two groups of supports;

[0009] The upper and lower cleaning rollers rotate to clean the upper and lower end surfaces of the plastic roll respectively, and the upper cleaning roller drives the air collecting assembly to blow out air through the cleaning cylinder to clean the upper and lower end surfaces of the plastic roll respectively;

[0010] When the lifting blister mold base is lifted, the plastic roll is clamped on the upper end of the frame by the clamping assembly driving the abutting assembly to move downward, and the air in the forming cavity at the upper end of the lifting blister mold base is sucked out by the air suction assembly, until the plastic roll is formed by suction molding in the forming cavity.

[0011] Preferably, the middle fixed roller shafts of the upper and lower cleaning rollers are movably connected between the two groups of support plates, and the roller shafts of the upper and lower groups penetrate through the corresponding support plates and are respectively connected with the first and second gears, and the middle of the first gear is further fixed with a first belt pulley;

[0012] The middle of the second gear is connected to the output end of the first servo motor, and the first servo motor is fixed on the mounting frame on the corresponding support plate;

[0013] The first and second gears are of the same size, and the first gear is engaged on the top of the second gear.

[0014] Preferably, the middle of the discharge roller is provided with a discharge shaft, one end of the discharge shaft penetrates through the corresponding support plate and is fixed with a second belt pulley, the first and second belt pulleys are of the same size, and the belt is connected between the first and second belt pulleys.

[0015] The surfaces of the upper and lower cleaning rollers are evenly provided with a plurality of groups of rubber cleaning blades.

[0016] Preferably, the air collecting assembly comprises a third gear and a fourth gear movably connected to the corresponding support plate, an air collecting cover is fixed outside the support plate, and the other end of the upper roller shaft penetrates through the support plate and is fixed with a fifth gear;

[0017] The outer side of the third gear is fixed with a sixth gear, the fifth gear is engaged on the top of the third gear, the sixth gear is engaged on the side of the fourth gear, and the outer side of the fourth gear is further fixed with a fan blade;

[0018] The third, sixth, fourth, fan blade and fifth gears are located in the air collecting cover, and the middle of the outer side of the air collecting cover is connected to the cleaning cylinder by an exhaust pipe.

[0019] Preferably, the cleaning cylinder is hollow, and the surface of the cleaning cylinder is uniformly distributed with exhaust holes;

[0020] The size of the fifth gear is larger than that of the third gear, the size of the sixth gear is larger than that of the third gear, and the size of the sixth gear is larger than that of the fourth gear;

[0021] The inner wall of the air collecting cover is fixed with an air guide horn pipe opposite to the fan blade, and the cleaning cylinder is in communication with the air guide horn pipe through the exhaust pipe;

[0022] The top inner side of the gas collection hood is connected to an air inlet box, and a filter element is inserted into the opening at the outer end of the air inlet box.

[0023] Preferably, the clamping assembly includes a bottom clamping frame and a top frame whose top is fixed by a first spring, and the light rod at the top of the frame passes through the bottom clamping frame and the top frame in sequence;

[0024] The abutment assembly includes a pin fixed to the upper part of the support and a first abutment rod and a second abutment rod distributed in an X shape. The first abutment rod and the second abutment rod are movably connected by the pin.

[0025] The bottom of the first abutting rod and the second abutting rod are equipped with abutting wheels, and the top inner side of the first abutting rod and the second abutting rod are fixed with sliding rods, which slide in the groove on the side of the bottom pressing frame;

[0026] The extension plates on both sides of the lifting vacuum forming mold base extend through the slots on the support, and the abutment wheel abuts against the upper surface of the extension plate.

[0027] The upper end of the base is equipped with an electric cylinder located directly below the lifting vacuum forming mold base, and the piston rod at the output end of the electric cylinder is connected to the middle of the lower end of the lifting vacuum forming mold base.

[0028] Preferably, a limiting seat is provided at the corner of the lifting vacuum forming mold base, and the limiting seat slides in the vertical limiting groove on the inner wall of the support;

[0029] The suction assembly includes a cylinder body fixed to the upper end of the base, a piston inside the cylinder body, a pull rope fixed in the middle of the piston, a guide wheel installed at the bottom of the vertical limiting groove, and a suction pipe system that connects the inner end of the cylinder body to the molding cavity.

[0030] The pull rope extends out of the outer end of the cylinder body and passes around the bottom of the corresponding guide wheel before connecting to the bottom of the limiting seat;

[0031] The bottom of the inner wall of the molding cavity is provided with a protruding frame, and a reserved opening is provided in the center of the bottom of the molding cavity;

[0032] The intake pipe system includes a five-way pipe connected to the inner end of the cylinder body via an intake hose, a hollow pipe connected to the top of the five-way pipe, and a sealing plate that extends into the molding cavity through a pre-reserved opening and is then fixed.

[0033] The hollow tube is provided with an air intake hole at the top, and a second spring is sleeved on the top of the hollow tube. The second spring is located between the sealing plate and the bottom wall of the forming cavity. The size of the sealing plate is consistent with the inner diameter of the protrusion frame.

[0034] Compared with existing technologies, the advantages of this invention are as follows: The upper and lower cleaning rollers rotate synchronously, enabling simultaneous physical cleaning of the upper and lower surfaces of the plastic roll material, effectively removing surface dust and impurities. Simultaneously, the upper cleaning roller drives the air collection assembly, causing the cleaning cylinder to blow airflow, cleaning the upper and lower surfaces of the plastic roll material. This combination of physical and airflow cleaning achieves comprehensive deep cleaning of the plastic roll material, ensuring a high level of cleanliness before entering the thermoforming process, improving the quality of thermoformed products, and reducing product defects caused by unclean roll surfaces.

[0035] When the lifting vacuum forming mold rises, the clamping components quickly clamp the plastic roll material via the abutment assembly, while the vacuum forming process continues through the suction pipe system. Conversely, as the lifting vacuum forming mold descends, the clamping and abutment components quickly reset, releasing the plastic roll material and facilitating demolding after forming. This interconnected mechanism ensures that the plastic roll material is clamped and released at the appropriate time during the vacuum forming process, facilitating demolding, improving work efficiency, reducing operation time, and meeting the demands of large-scale production. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural diagram of the initial state of the present invention;

[0037] Figure 2 For the present invention Figure 1 A schematic diagram of the three-dimensional structure from another perspective;

[0038] Figure 3 This is a schematic diagram of the gas collection component of the present invention;

[0039] Figure 4 For the present invention Figure 3 A schematic diagram of the three-dimensional structure from another perspective;

[0040] Figure 5 This is a schematic diagram of the structure of the air guide bell tube of the present invention;

[0041] Figure 6 A schematic diagram of the structure of the support of the present invention;

[0042] Figure 7 This is a schematic diagram of the connection between the clamping component and the abutment component of the present invention;

[0043] Figure 8 This is a schematic diagram of the structure of the lifting vacuum forming mold base of the present invention;

[0044] Figure 9 This is a schematic diagram showing the connection between the sealing plate, the second spring, the hollow tube, the five-way tube, and the suction hose of the present invention.

[0045] Figure 10 This is a three-dimensional structural diagram showing the connection between the clamping component, the abutment component, the lifting vacuum forming mold base, and the suction pipe system in the initial state of the present invention.

[0046] Figure 11 For the present invention Figure 10 A schematic diagram of the cross-sectional structure;

[0047] Figure 12 This is a three-dimensional structural diagram showing the connection between the clamping component, the abutment component, and the lifting vacuum forming mold base in the initial state of the present invention;

[0048] Figure 13 For the present invention Figure 12 A schematic diagram of the three-dimensional structure from another perspective;

[0049] Figure 14 For the present invention Figure 12 A schematic diagram of the cross-sectional structure;

[0050] Figure 15 This is a schematic diagram of the structure of the plastic roll material of the present invention during release;

[0051] Figure 16 This is a schematic diagram of the structure of the present invention when performing negative pressure thermoforming on plastic rolls;

[0052] Figure 17 This is a schematic diagram of the structure of the plastic roll after being combined with the molding cavity according to the present invention.

[0053] In the diagram: 1. Base; 2. Gas collection hood; 3. Air inlet box; 301. Filter element; 4. Exhaust pipe; 5. Feeding drum; 6. Cleaning drum; 61. Exhaust port; 7. Second pulley; 8. Belt; 9. Upper cleaning roller; 10. Second gear; 11. First servo motor; 12. First pulley; 13. Mounting bracket; 14. First gear; 15. Support; 151. Slot; 152. Frame; 153. Vertical limiting slot; 154. Smooth rod; 16. Abutment assembly; 161. Pin; 162. First abutment rod; 163. Abutment wheel; 164. Second abutment rod; 165. Sliding rod; 17. Clamping assembly; 171. Top frame; 172. Bottom clamping frame; 173. 174. First spring; 18. Slide groove; 19. Lifting vacuum forming mold base; 10. Limiting seat; 11. Extension plate; 12. Forming cavity; 13. Protruding frame; 14. Reserved opening; 15. Cylinder body; 26. Guide wheel; 27. Support plate; 28. Lower cleaning roller; 29. ​​Rubber cleaning scraper; 20. Third gear; 20. Sixth gear; 21. Fourth gear; 22. Fan blade; 23. Fifth gear; 24. Air guide horn pipe; 35. Electric cylinder; 36. Sealing plate; 37. Second spring; 38. Hollow tube; 39. Five-way pipe; 30. Suction hose; 31. Suction hole; 32. Pull rope; 33. Piston; 44. Piston rod; 50. Plastic roll; 41. Tension spring. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Example:

[0056] Please see Figures 1-17 The present invention provides a technical solution:

[0057] A vacuum forming machine includes a base 1, with support plates 21 on both sides of the front part of the base 1, and a feeding roll 5, two sets of cleaning rolls 6, and an upper cleaning roller 9 and a lower cleaning roller 22 distributed vertically between the two sets of support plates 21.

[0058] The upper cleaning roller 9 and the lower cleaning roller 22 are fixed in the middle of the roller shaft and are movably connected between the two sets of support plates 21. The upper and lower roller shafts pass through the corresponding support plates 21 and are respectively connected to the first gear 14 and the second gear 10. The first gear 14 is also fixed in the middle of the first pulley 12.

[0059] The middle part of the second gear 10 is connected to the output end of the first servo motor 11, and the first servo motor 11 is fixed on the mounting bracket 13 on the corresponding bracket plate 21; the first servo motor 11 is controlled by a PLC.

[0060] The first gear 14 and the second gear 10 are the same size. The first gear 14 meshes with the top of the second gear 10, so that the upper cleaning roller 9 and the lower cleaning roller 22 rotate at the same speed, and the two sets of rotations rotate in opposite directions. Figure 15 As shown, the upper cleaning roller 9 rotates clockwise, and the lower cleaning roller 22 rotates counterclockwise, while the plastic roll 40 moves backward (i.e., ...). Figure 15 When the upper cleaning roller 9 and the lower cleaning roller 22 move (to the right), the rubber cleaning scrapers 23 on the surfaces of the upper cleaning roller 9 and the lower cleaning roller 22 can clean the upper and lower surfaces of the plastic roll 40.

[0061] The feeding drum 5 has a feeding shaft in the middle. One end of the feeding shaft passes through the corresponding support plate 21 and is fixed with a second pulley 7. The first pulley 12 and the second pulley 7 have the same size, and a belt 8 connects the first pulley 12 and the second pulley 7.

[0062] The first servo motor 11 drives the second gear 10 and the lower cleaning roller 22 to rotate. At the same time, the second gear 10 drives the upper cleaning roller 9 and the first pulley 12 to rotate through the first gear 14. The first pulley 12 drives the feeding drum 5 through the belt 8 and the second pulley 7, so as to release the plastic roll 40 on the feeding drum 5.

[0063] The base 1 is also equipped with a take-up drum driven by a second servo motor. The second servo motor is controlled by a PLC. After vacuum forming, the remaining part of the plastic roll 40 is not disconnected from the plastic roll 40 on the feeding drum 5. The remaining part of the plastic roll 40 after vacuum forming is wound onto the take-up drum. The second servo motor drives the take-up drum to work, so that the plastic roll 40 moves backward as a whole.

[0064] Several sets of rubber cleaning scrapers 23 are evenly spaced on the surfaces of the upper cleaning roller 9 and the lower cleaning roller 22. When the upper cleaning roller 9 and the lower cleaning roller 22 rotate, the rubber cleaning scrapers 23 come into contact with the surface of the plastic roll 40 to scrape off the dust on the surface of the plastic roll 40, thereby cleaning the upper and lower surfaces of the plastic roll 40.

[0065] The meshing of the first gear 14 and the second gear 10, and the connection between the first pulley 12 and the second pulley 7 via the belt 8, ensure the synchronous rotation of the unloading drum 5 and the two cleaning rollers (i.e., the upper cleaning roller 9 and the lower cleaning roller 22), ensuring that the plastic roll 40 can be cleaned in time during the unloading process. This transmission method has high stability and accuracy, and can effectively reduce the probability of failure.

[0066] The base 1 has supports 15 on both sides of the middle part, and a frame 152 is provided on the top of the two sets of supports 15. A clamping component 17 is provided on the top of the frame 152. Abutment components 16 are connected on both sides of the clamping component 17. A lifting vacuum forming mold base 18 is slidably connected between the two sets of supports 15.

[0067] The clamping assembly 17 includes a bottom clamping frame 172 and a top frame 171 fixed at the top of the bottom clamping frame 172 by a first spring 173. The light rod 154 at the top of the frame 152 passes through the bottom clamping frame 172 and the top frame 171 in sequence.

[0068] The combination of the bottom clamping frame 172, the top frame 171, and the first spring 173 ensures appropriate clamping force for plastic rolls 40 of different thicknesses, preventing movement of the rolls during thermoforming, while also avoiding damage to the rolls due to excessive clamping force. The cooperation between the sliding rod 165 and the sliding groove 174 allows the abutment component 16 to accurately drive the clamping component 17.

[0069] The abutment assembly 16 includes a pin 161 fixed to the upper part of the support 15 and a first abutment rod 162 and a second abutment rod 164 distributed in an X shape. The first abutment rod 162 and the second abutment rod 164 are movably connected by the pin 161.

[0070] The bottom of the first abutting rod 162 and the second abutting rod 164 are equipped with abutting wheels 163. The top inner side of the first abutting rod 162 and the second abutting rod 164 are fixed with sliding rods 165, which slide in the groove 174 on the side of the bottom pressing frame 172.

[0071] The extension plates 183 on both sides of the lifting vacuum forming mold base 18 extend through the slots 151 on the support 15, and the abutment wheel 163 abuts against the upper surface of the extension plate 183.

[0072] An electric cylinder 30 is located at the upper end of the base 1, directly below the lifting vacuum forming mold base 18. The piston rod 39 at the output end of the electric cylinder 30 is connected to the middle of the lower end of the lifting vacuum forming mold base 18.

[0073] The lifting vacuum forming mold base 18 achieves lifting and lowering through the cooperation of the extension plate 183 and the abutment wheel 163. Simultaneously, the sliding contact between the limiting seat 182 and the vertical limiting groove 153 ensures the stability and accuracy of the lifting process. The connection of the pull rope 37, guide wheel 20, and piston 38 synchronizes the rising of the lifting vacuum forming mold base 18 with the suction action, improving the efficiency of vacuum forming. In the suction pipe system, the size matching between the sealing plate 31 and the raised frame 185, along with the placement of the second spring 32, ensures the sealing of the forming cavity 184, facilitating the formation of a stable negative pressure environment and guaranteeing the quality of vacuum forming.

[0074] The electric cylinder 30 is controlled by a PLC. When the electric cylinder 30 is working, the piston rod 39 is used to raise and lower the lifting vacuum forming mold base 18.

[0075] The plastic roll 40 on the feeding drum 5 passes sequentially between the upper and lower cleaning drums 6, between the upper cleaning roller 9 and the lower cleaning roller 22, and between the clamping assembly 17 and the frame 152;

[0076] The upper cleaning roller 9 and the lower cleaning roller 22 rotate to clean the upper and lower surfaces of the plastic roll 40 respectively. At the same time, the upper cleaning roller 9 drives the air collection assembly to blow air out through the cleaning cylinder 6 to clean the upper and lower surfaces of the plastic roll 40 respectively.

[0077] The gas collection assembly includes a third gear 24 and a fourth gear 26 movably connected to the corresponding support plate 21. A gas collection hood 2 is fixed to the outside of the support plate 21, and a fifth gear 28 is fixed to the other end of the upper roller shaft after it extends through the support plate 21.

[0078] The sixth gear 25 is fixed to the outer end of the third gear 24, the fifth gear 28 meshes with the top of the third gear 24, the sixth gear 25 meshes with the side of the fourth gear 26, and the fan blade 27 is also fixed to the outer end of the fourth gear 26.

[0079] The third gear 24, the sixth gear 25, the fourth gear 26, the fan blade 27 and the fifth gear 28 are all located inside the air collection hood 2, and the middle of the outer end of the air collection hood 2 is connected to the cleaning cylinder 6 by an exhaust pipe 4.

[0080] The cleaning cylinder 6 is hollow, and the surface of the cleaning cylinder 6 is evenly distributed with vent holes 61;

[0081] The fifth gear 28 is larger than the third gear 24, the sixth gear 25 is larger than the third gear 24, and the sixth gear 25 is larger than the fourth gear 26;

[0082] An air guide horn 29 is fixed on the inner wall of the air collection hood 2, facing the fan blade 27. The cleaning cylinder 6 is connected to the air guide horn 29 through the exhaust pipe 4.

[0083] When the fan blade 27 rotates at high speed inside the air collection hood 2, it generates a high-speed airflow. The unique horn-shaped structure of the air guide horn pipe 29 can precisely guide the direction of the airflow generated by the fan blade 27, directing it towards the exhaust pipe 4, preventing the airflow from running wildly inside the air collection hood 2, thus ensuring the high efficiency and stability of airflow transmission, and providing a stable and powerful air source for the cleaning cylinder 6.

[0084] The trumpet-shaped design results in a larger diameter at the end of the air guide trumpet 29 near the fan blade 27 and a smaller diameter at the end connecting to the exhaust pipe 4. According to fluid dynamics principles, the airflow velocity gradually increases as it flows from the larger diameter end to the smaller diameter end. This characteristic significantly increases the airflow velocity through the air guide trumpet 29, enhancing the impact force of the airflow blown from the exhaust port 61 of the cleaning cylinder 6. The high-speed airflow can more effectively blow away dust and impurities from the surface of the plastic roll 40, improving the cleaning effect and ensuring that the plastic roll 40 achieves a high level of cleanliness before entering the thermoforming process.

[0085] The top inner side of the air collection hood 2 is connected to the air inlet box 3, and a filter element 301 is inserted into the opening at the outer end of the air inlet box 3.

[0086] The coordination of the fifth gear 28, the third gear 24, the sixth gear 25, and the fourth gear 26 converts the rotation of the upper cleaning roller 9 into the rotation of the fan blades 27, thereby generating airflow to clean the plastic roll 40. The different sizes of the gears allow for accelerated rotation of the fan blades 27 through gear ratios, enhancing the cleaning effect. The placement of the air inlet box 3 and the filter element 301 ensures that the air entering the air collection hood 2 is clean, preventing secondary contamination of the plastic roll 40.

[0087] When the lifting vacuum forming mold base 18 is raised, the clamping component 17 drives the abutment component 16 to move down and clamp the plastic roll 40 to the upper end of the frame 152. At the same time, the lifting vacuum forming mold base 18 drives the air suction component to suck out the air in the forming cavity 184 at the upper end of the lifting vacuum forming mold base 18 until the plastic roll 40 is vacuum formed in the forming cavity 184.

[0088] A limiting seat 182 is provided at the corner of the lifting vacuum forming mold base 18, and the limiting seat 182 is slidably connected in the vertical limiting groove 153 on the inner wall of the support 15;

[0089] The suction assembly includes a cylinder body 19 fixed to the upper end of the base 1, a piston 38 inside the cylinder body 19, a pull rope 37 fixed in the middle of the piston 38, a guide wheel 20 installed at the bottom of the vertical limiting groove 153, and a suction pipe system that connects the inner end of the cylinder body 19 to the molding cavity 184.

[0090] The pull rope 37 extends out of the outer end of the cylinder body 19 and passes around the bottom of the corresponding guide wheel 20 before being connected to the bottom of the limit seat 182;

[0091] A raised frame 185 is provided at the bottom of the inner wall of the molding cavity 184, and a pre-reserved opening 186 is provided at the center of the bottom of the molding cavity 184.

[0092] The intake piping system includes a five-way pipe 34 connected to the inner end of the cylinder body 19 via an intake hose 35, a hollow pipe 33 connected to the top of the five-way pipe 34, and a sealing plate 31 that extends into the molding cavity 184 through a pre-reserved opening 186 and is then fixed.

[0093] The hollow tube 33 has an air intake hole 36 at the top and a second spring 32 is sleeved on the top of the hollow tube 33. The second spring 32 is located between the sealing plate 31 and the bottom wall of the forming cavity 184. The size of the sealing plate 31 is consistent with the inner diameter of the protrusion frame 185.

[0094] Specifically, during use, in the feeding stage: the first servo motor 11 starts, and its output drives the second gear 10 to rotate. Since the first gear 14 and the second gear 10 are the same size and mesh with each other, the first gear 14 rotates synchronously. The first pulley 12 in the middle of the first gear 14 also rotates together, driving the second pulley 7 to rotate through the belt 8, thereby causing the feeding drum 5 to rotate and feeding out the plastic roll 40.

[0095] Cleaning process: When the first servo motor 11 drives the second gear 10 to rotate, the second gear 10 drives the first gear 14 meshing with it to rotate, which in turn drives the upper cleaning roller 9 and the lower cleaning roller 22 to rotate in opposite directions.

[0096] The roller shaft of the upper cleaning roller 9 drives the fifth gear 28 to rotate. The fifth gear 28 meshes with the third gear 24, causing the third gear 24 to rotate. The sixth gear 25 on the outside of the third gear 24 rotates accordingly. The sixth gear 25 meshes with the fourth gear 26, causing the fourth gear 26 to rotate. The fan blade 27 at the outer end of the fourth gear 26 rotates at high speed in the air collection hood 2, drawing outside air into the air collection hood 2 through the air inlet box 3. The air is then blown out through the air guide horn pipe 29 and the exhaust pipe 4 from the exhaust hole 61 on the surface of the cleaning cylinder 6, performing preliminary airflow cleaning on the plastic roll 40.

[0097] At the same time, as the upper cleaning roller 9 and the lower cleaning roller 22 rotate in opposite directions, the rubber cleaning scraper 23 performs secondary physical cleaning on the upper and lower surfaces of the plastic roll 40.

[0098] Vacuum forming:

[0099] Mold lifting and roll clamping: The electric cylinder 30 is activated, the piston rod 39 extends, and pushes the lifting vacuum forming mold base 18 to rise. The extension plates 183 on both sides of the lifting vacuum forming mold base 18 push the abutment wheel 163, causing the first abutment rod 162 and the second abutment rod 164 to rotate around the pin 161, driving the sliding rod 165 to slide in the slide groove 174 of the bottom clamping frame 172. The top frame 171 drives the bottom clamping frame 172 to descend, clamping the plastic roll 40 between the bottom clamping frame 172 and the frame 152.

[0100] Vacuum forming: When the lifting vacuum forming mold base 18 continues to rise, the abutment component 16 will continuously drive the top frame 171 of the clamping component 17 to move downward. At this time, the first spring 173 is gradually in a compressed state, so that the top frame 171 continuously applies downward pressure to the bottom clamping frame 172 through the first spring 173. This can ensure that the lifting vacuum forming mold base 18 continues to rise, and also ensure that the bottom clamping frame 172 clamps the plastic roll 40 to the upper end of the frame 152.

[0101] In the initial state, due to the elastic force of the second spring 32 on the sealing plate 31, the height of the sealing plate 31 is higher than that of the protruding frame 185 (e.g., Figure 14 and 16 As shown in the figure, the suction hole 36 is connected to the molding cavity 184;

[0102] The top frame 171 is also equipped with an electric heating rod that is powered by a PLC. After the electric heating rod is powered on, it transfers the temperature to the plastic roll 40 directly below it, so that the plastic roll 40 is heated and its hardness and viscosity are reduced, while its flexibility and extensibility are increased.

[0103] In this way, under the lifting and negative pressure of the vacuum forming mold base 18, the plastic roll 40 can fit more tightly and closely to the inner wall of the forming cavity 184. Especially for some complex forming cavities, the heated plastic roll 40 can better fill the details, thereby improving the precision and quality of vacuum forming and reducing the occurrence of forming defects such as wrinkles and bubbles.

[0104] During the upward movement of the lifting vacuum forming mold base 18, the plastic roll 40 directly above it is lifted upward. The limiting seat 182 slides upward within the vertical limiting groove 153, pulling the pull rope 37. The pull rope 37 passes around the guide wheel 20, driving the piston 38 in the cylinder body 19 to move, creating negative pressure in the forming cavity 184. The air in the forming cavity 184 is extracted through the suction pipe system, namely through the suction hose 35, the five-way pipe 34, and the hollow pipe 33, and through the suction hole 36 at the top of the hollow pipe 33.

[0105] Under negative pressure, the plastic roll 40 adheres to the inner wall of the molding cavity 184, especially to the raised frame 185, and finally completes the vacuum forming process.

[0106] As the plastic roll 40 gradually adheres to the inner wall of the molding cavity 184, the plastic roll 40 gradually presses down on the sealing plate 31 until the second spring 32 is fully compressed. At this point, the top of the sealing plate 31 is flush with the top of the raised frame 185. At this time, the suction hole 36 is no longer connected to the molding cavity 184. When the lifting vacuum forming mold base 18 continues to rise, the cylinder body 19 can only continue to draw air from the space between the sealing plate 31 and the raised frame 185, and no longer draw air from the molding cavity 184. Therefore, after the plastic roll 40 adheres to the inner wall of the molding cavity 184, the raised frame 185 and the bottom of the sealing plate 31, the bottom of the plastic roll 40 will not undergo excessive vacuum forming deformation due to negative pressure.

[0107] When the electric cylinder 30 is activated and the piston rod 39 retracts, causing the lifting vacuum forming mold base 18 to descend, the following steps and the corresponding movements and working principles of other components will also be involved:

[0108] The actions of clamping components and abutting components:

[0109] When the lifting vacuum forming mold base 18 descends, the extension plates 183 on both sides of it also descend. Since the abutment rollers 163 abut against the upper surface of the extension plates 183, the descent of the extension plates 183 will cause the abutment rollers 163 to lose the upward thrust from the extension plates 183.

[0110] At this time, under the elastic force of the first spring 173, the top frame 171 gradually moves upward, causing the abutment component 16 to gradually reset. The abutment component 16 will drive the bottom pressing frame 172 to move upward through the top frame 171.

[0111] Because the sliding rods 165 on the inner top sides of the first abutment rod 162 and the second abutment rod 164 slide into the grooves 174 on the side of the bottom clamping frame 172, the upward movement of the bottom clamping frame 172 will cause the first abutment rod 162 and the second abutment rod 164 to rotate around the pin 161, causing the abutment wheel 163 to move closer to each other, thereby loosening the clamping state on the plastic roll 40. This process allows the plastic roll 40 to be unloaded and other operations in the future, preparing it for the next thermoforming process.

[0112] Furthermore, to ensure the top frame 171 moves upward and resets, a reset spring can be fitted onto the light rod 154. The reset spring is located between the bottom clamping frame 172 and the frame 152. The reset spring is not shown in the figure.

[0113] Changes to the intake components:

[0114] When the lifting vacuum forming mold base 18 descends, the limiting seat 182 at the corner also slides downward within the vertical limiting groove 153 on the inner wall of the support 15. Since the inner end of the piston 38 is also connected to the tension spring 41, the tension spring 41 drives the piston 38 to move and reset within the cylinder body 19.

[0115] As the piston 38 moves, the air pressure inside the cylinder 19 gradually returns to normal, and the negative pressure in the suction pipe system connected to the forming cavity 184 also gradually disappears. At this time, the sealing plate 31 moves upward under the elastic force of the second spring 32, pushing the formed plastic roll 40 away from the bottom wall of the forming cavity 184 to achieve demolding, and at the same time preparing for the formation of negative pressure in the next vacuum forming.

[0116] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum forming machine, comprising a base, characterized in that: The base has support plates on both sides of the front part, and between the two sets of support plates are a feeding drum, two sets of cleaning drums, and an upper cleaning roller and a lower cleaning roller distributed vertically. The base has supports on both sides of the middle section, and a frame is provided on the top of the two sets of supports. A clamping component is provided on the top of the frame, and abutment components are connected on both sides of the clamping component. A lifting vacuum forming mold base is slidably connected between the two sets of supports. The upper and lower cleaning rollers rotate to clean the upper and lower surfaces of the plastic roll respectively. At the same time, the upper cleaning roller drives the air collection assembly to blow air out through the cleaning cylinder to clean the upper and lower surfaces of the plastic roll respectively. When the lifting vacuum forming mold base is raised, the clamping component drives the abutment component to move down and clamp the plastic roll material to the upper end of the frame. At the same time, the lifting vacuum forming mold base drives the air suction component to suck out the air in the forming cavity at the upper end of the lifting vacuum forming mold base until the plastic roll material is vacuum formed in the forming cavity. The gas collection assembly includes a third gear and a fourth gear movably connected to a corresponding support plate, and a gas collection hood is fixed to the outside of the support plate. The other end of the upper roller shaft extends through the support plate and is fixed with a fifth gear; The outer end of the third gear is fixed with a sixth gear, the fifth gear meshes with the top of the third gear, the sixth gear meshes with the side of the fourth gear, and the outer end of the fourth gear is also fixed with a fan blade. The third gear, sixth gear, fourth gear, fan blade and fifth gear are all located inside the gas collection hood, and the middle of the outer end of the gas collection hood is connected to the cleaning cylinder by an exhaust pipe; The cleaning cylinder is hollow, and the surface of the cleaning cylinder is evenly distributed with vent holes; The fifth gear is larger than the third gear, the sixth gear is larger than the third gear, and the sixth gear is larger than the fourth gear; An air guide horn tube facing the fan blades is fixed on the inner wall of the air collection hood, and the cleaning cylinder is connected to the air guide horn tube through the exhaust pipe. The top inner side of the gas collection hood is connected to an air inlet box, and a filter element is inserted into the opening at the outer end of the air inlet box. The clamping assembly includes a bottom clamping frame and a top frame fixed at the top of the bottom clamping frame by a first spring, and the light rod at the top of the frame passes through the bottom clamping frame and the top frame in sequence; The abutment assembly includes a pin fixed to the upper part of the support and a first abutment rod and a second abutment rod distributed in an X shape. The first abutment rod and the second abutment rod are movably connected by the pin. The bottom of the first abutting rod and the second abutting rod are equipped with abutting wheels, and the top inner side of the first abutting rod and the second abutting rod are fixed with sliding rods, which slide in the groove on the side of the bottom pressing frame; The extension plates on both sides of the lifting vacuum forming mold base extend through the slots on the support, and the abutment wheel abuts against the upper surface of the extension plate. The upper end of the base is equipped with an electric cylinder located directly below the lifting vacuum forming mold base, and the piston rod at the output end of the electric cylinder is connected to the middle of the lower end of the lifting vacuum forming mold base.

2. The vacuum forming machine according to claim 1, characterized in that: The upper and lower cleaning rollers are fixed in the middle of the roller shafts and are movably connected between the two sets of support plates. The upper and lower roller shafts pass through the corresponding support plates and are respectively connected to the first gear and the second gear. The first gear is also fixed in the middle of the first pulley. The middle part of the second gear is connected to the output end of the first servo motor, and the first servo motor is fixed on the mounting bracket on the corresponding support plate; The first gear and the second gear are the same size, and the first gear meshes with the top of the second gear.

3. The vacuum forming machine according to claim 2, characterized in that: The feeding drum is provided with a feeding shaft in the middle. One end of the feeding shaft passes through the corresponding support plate and is fixed with a second pulley. The first pulley and the second pulley are the same size, and a belt connects the first pulley and the second pulley.

4. The vacuum forming machine according to claim 1, characterized in that: The surfaces of the upper and lower cleaning rollers are each provided with several sets of rubber cleaning scrapers at equal intervals.

5. The vacuum forming machine according to claim 1, characterized in that: A limiting seat is provided at the corner of the lifting vacuum forming mold base, and the limiting seat slides in the vertical limiting groove on the inner wall of the support; The suction assembly includes a cylinder body fixed to the upper end of the base, a piston inside the cylinder body, a pull rope fixed in the middle of the piston, a guide wheel installed at the bottom of the vertical limiting groove, and a suction pipe system that connects the inner end of the cylinder body to the molding cavity. The pull rope extends out of the outer end of the cylinder body and passes around the bottom of the corresponding guide wheel before connecting to the bottom of the limiting seat; The bottom of the inner wall of the molding cavity is provided with a protruding frame, and a reserved opening is provided in the center of the bottom of the molding cavity; The intake pipe system includes a five-way pipe connected to the inner end of the cylinder body via an intake hose, a hollow pipe connected to the top of the five-way pipe, and a sealing plate that extends into the molding cavity through a pre-reserved opening and is then fixed. The hollow tube is provided with an air intake hole at the top, and a second spring is sleeved on the top of the hollow tube. The second spring is located between the sealing plate and the bottom wall of the forming cavity. The size of the sealing plate is consistent with the inner diameter of the protrusion frame.

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