A thermoforming machine

Abstract

The present invention provides a vacuum forming machine, which belongs to the technical field of mechanical equipment. It solves the problem that the quality of products formed by existing vacuum forming machines is poor. The vacuum forming machine comprises a frame, a movable lower mold with an upward opening is provided on the frame, the lower mold is provided with an air suction hole connected to the inner cavity, a sliding seat is slidably connected to the frame, an air suction pipe that can be connected to the air suction hole when extended is slidably inserted on the sliding seat, an air extraction hole for connecting to an air suction source and connected to the air suction pipe when the air suction pipe is extended is provided on the sliding seat, an upper mold that can be raised and lowered and opened downward is provided on the frame, and can be covered on the lower mold when the upper mold descends, and the upper mold is also provided with a blowing hole that is connected to the inner cavity and used to connect to the blowing air source. The quality of products formed by the vacuum forming machine is good.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical equipment and relates to a plastic suction machine. Background Art

[0002] A plastic suction machine, also known as a thermoplastic forming machine, is a machine that sucks heat-plasticized PVC, PE, PP, PET, HIPS and other thermoplastic plastic coils into various shapes of packaging boxes, frames and other products. It uses the vacuum suction generated by a vacuum pump to suck the heated and softened thermoplastic sheet into various shapes of vacuum covers, plastic suction trays, blister shells, etc. through a mold. Therefore, a plastic suction machine at least includes a mold and a suction member capable of sucking air into the inner cavity of the mold.

[0003] For example, the circulating plastic suction mechanism disclosed in the patent document (application number: 201811145094.6) includes a conveyor-type plastic suction workbench and a sliding vacuum suction device. A plurality of circulating plates are laid on the conveyor chain of the conveyor-type plastic suction workbench. The circulating plate includes a template with an inner cavity, and an air suction pipe communicating with the inner cavity is further provided on the template. The sliding vacuum suction device includes a slide rail. One end of the slide rail is provided with a film pressing cylinder, and an air suction docking pipe is provided on the piston rod of the film pressing cylinder. The air inlet of the air suction docking pipe is connected to a vacuum suction pump through a hose and a solenoid valve. When the air suction pipe on the template is opposite to the air suction docking pipe, the film pressing cylinder drives the air suction docking pipe to extend and dock with the air suction pipe, and the solenoid valve controls the vacuum suction pump to suck air into the inner cavity of the template.

[0004] Since the plastic film passes above the template and covers the template as much as possible, there are still gaps between the plastic film and the template during actual production. The suction force generated by the suction pipe is likely to leak, making it difficult to quickly adsorb the plastic film. Of course, if the product has high thickness requirements, resulting in a relatively thick plastic film itself, this will also cause difficulties in stretching the plastic film. At the same time, to improve production efficiency, multiple products are usually formed by thermoforming on one template. Therefore, the template is usually large in volume. The template is connected to the suction device through the suction pipe. The suction pipe is only located at a certain position relative to the relatively large-volume template. Therefore, when sucking air, the position where the suction pipe is connected forms a vacuum first, and the degree of vacuum is also large, causing the plastic film to be stretched and adhered to the template first, and then adhesion occurs at other positions. That is, the vacuum formed in the entire inner cavity of the template is not uniform enough, resulting in uneven stretching of the plastic film and uneven adhesion thickness, affecting the product quality. At the same time, since the cylinder needs to move with the template during the air suction process, the suction connection pipe needs to drag the hose connected to the vacuum suction pump. Correspondingly, the hose will generate a reverse dragging force on the suction connection pipe. This dragging force will cause the suction connection pipe to rotate circumferentially. At the same time, the suction connection pipe is frequently subjected to radial forces and is prone to unilateral wear, deformation, etc., resulting in poor stability of the suction connection pipe and inaccurate docking with the suction pipe. In order to stop the air suction when the suction connection pipe is separated from the suction pipe and avoid waste of the vacuum degree of the vacuum suction pump, an independent solenoid valve needs to be set to control the on-off of the air path.

[0005] Regarding the problem that the above-mentioned plastic film is difficult to be adsorbed, those skilled in the art will naturally think of reducing the air leakage between the plastic film and the template. Therefore, the method of using a pressure foot to press down the edge of the plastic film is adopted to make the plastic film close to the template, reduce air leakage, and at the same time increase the suction power for the template, such as increasing the diameter of the suction pipe. Regarding the problem of uneven vacuum suction in the inner cavity of the above-mentioned template, those skilled in the art are likely to think of increasing the number of suction pipes on the basis of considering increasing the diameter of the suction pipe, and evenly distributing multiple suction pipes, that is, increasing the air suction volume and making the air flow in the inner cavity of the template more uniform. Regarding the dragging of the suction pipe, those skilled in the art are likely to think about how to position the suction pipe. For example, a circumferential positioning structure is set for the suction pipe. This structure is also relatively conventional and can adopt the way of spline fitting to prevent the circumferential rotation of the suction pipe, thereby increasing the stability of the suction pipe. Summary of the Invention

[0006] The object of the present invention is to address the above problems existing in the prior art and propose a thermoforming machine to solve the problem of poor product quality formed by the existing thermoforming machine.

[0007] The object of the present invention can be achieved by the following technical solutions: A plastic blister machine includes a frame, on which a lower mold capable of moving and having an upward opening is provided. The lower mold is provided with air suction holes communicating with the inner cavity. It is characterized in that a sliding seat is slidably connected to the frame, and an air suction pipe that can be slidably inserted into the sliding seat and can be docked and communicated with the air suction holes when extended is provided on the sliding seat. A suction hole for connecting an air suction source and capable of being communicated with the air suction pipe when the air suction pipe extends is provided on the sliding seat. An upper mold capable of lifting and having a downward opening is provided on the frame. When the upper mold descends, it can cover the lower mold. The upper mold is also provided with a blowing hole communicating with the inner cavity and used for connecting a blowing air source.

[0008] Inside the lower mold is a concave mold core whose inner side surface conforms to the shape of the product. By adhering the plastic film to the concave mold, the corresponding product is formed. The air suction source can adopt vacuum equipment such as a vacuum pump. The air suction source is always communicated with the suction hole of the sliding seat through a hose. The blowing air source can adopt an air pump, etc. The blowing air source is always communicated with the blowing hole of the upper mold through a hose. When the plastic film covers the lower mold and the lower mold moves to make the air suction holes opposite to the air suction pipe, the upper mold descends and covers the lower mold. The inner cavity of the upper mold and the inner cavity of the lower mold form a substantially closed cavity. The blowing air source blows air into the upper mold through the blowing hole, so that the upper mold is inflated and forms a positive pressure. The positive pressure air flow in the upper mold can act on the upper side of the plastic film, so that the plastic film is stretched and expanded into the lower mold. At the same time, the air suction pipe extends and docks with the lower mold, and the air suction pipe is communicated with the air suction holes of the lower mold. At the same time, the air suction pipe is also communicated with the suction hole of the sliding seat. The lower mold drives the sliding seat to move together through the air suction pipe. During the movement, the air suction source sucks air into the inner cavity of the lower mold through the suction hole and the air suction pipe, so as to form a negative pressure in the inner cavity of the lower mold. Among them, when the upper mold covers the lower mold, it can play a role in pressing the plastic film, so as to avoid air leakage between the plastic film and the lower mold. The upper mold blows air downward, and the air flow acts evenly on the upper side of the plastic film, so that the plastic film is uniformly stretched in advance, that is, a positive pressure is formed in the inner cavity of the upper mold to assist the negative pressure generated in the inner cavity of the lower mold. The combination of the two makes the plastic film uniformly adhere to the concave mold core of the lower mold, improving the product forming quality. Compared with the existing hose connection of the air suction source to the air suction pipe, the hose of the present air suction source is connected to the sliding seat, and the sliding seat is slidably connected to the frame. Therefore, during the movement, the dragging force of the hose of the air suction source is applied to the sliding seat, which will not affect the telescopic movement and stability of the air suction pipe, avoiding the rotation and unilateral excessive wear of the air suction pipe caused by lateral dragging, ensuring the accuracy of the telescopic position of the air suction pipe and the stability of docking with the air suction holes on the lower mold, avoiding air leakage during the air suction process of the air suction pipe, and thus ensuring sufficient air suction volume and improving the product forming quality.

[0009] In the above-mentioned plastic thermoforming machine, a guide rail is provided on the frame along the moving direction of the lower mold. The sliding seat is slidably connected to the guide rail. One end of the guide rail is provided with a reset cylinder, and the other end is provided with a limit post. The piston rod of the reset cylinder faces the limit post. When the suction pipe is docked with the suction hole of the lower mold, the lower mold can drive the suction pipe to move towards the end where the reset cylinder is located. The guide rail provides guidance for the movement of the sliding seat and ensures the stability of the sliding seat when the hose of the suction air source exerts a dragging force on the sliding seat. During the plastic thermoforming process, the lower mold drives the sliding seat to move closer to the reset cylinder. When the plastic thermoforming is completed and the suction pipe is separated from the lower mold, the reset cylinder can push the sliding seat to reset and move towards the limit post to prepare for docking with the next lower mold. The limit post can limit the position of the sliding seat, making the position of the sliding seat after reset more accurate and ensuring more stable docking with the lower mold.

[0010] In the above-mentioned plastic thermoforming machine, a guide hole is formed on the sliding seat. The above-mentioned extraction hole is communicated with the guide hole. The suction pipe is slidably inserted into the guide hole. An air passing hole is formed on the side wall of the suction pipe. When the suction pipe extends and is docked and communicated with the suction hole of the lower mold, the air passing hole can be communicated with the extraction hole. When the suction pipe retracts inward, the air passing hole can be blocked. When the suction pipe retracts, the air passing hole can be blocked, and when it extends, the air passing hole is communicated with the extraction hole, realizing the mechanical opening and closing of the air path. There is no need to install a solenoid valve to block the air path. Therefore, there is no need to install a solenoid valve, reducing the use of electronic control components, which not only reduces costs but also further improves stability.

[0011] In the above-mentioned plastic suction machine, the aperture of the guiding hole is larger than the outer diameter of the suction pipe. At both ends inside the guiding hole, sliding sleeves are fixed. The suction pipe slides through the two sliding sleeves. An air suction cavity is formed between the end faces of the two sliding sleeves. The above-mentioned air extraction hole is communicated with the air suction cavity. When the suction pipe extends and is butt-connected and communicated with the air suction hole of the lower mold, the air passing hole can be communicated with the air suction cavity. When the suction pipe retracts inward, the air passing hole is blocked by the inner peripheral surface of one of the sliding sleeves. The suction pipe is in sliding fit with the two sliding sleeves to ensure the stability of the suction pipe. And only the suction pipe needs to be subjected to thermal process treatment and the smoothness of its outer wall is ensured, thereby ensuring the airtightness between the inner peripheral wall of the sliding sleeve and the outer peripheral wall of the suction pipe. There is no need to perform thermal process treatment on the sliding seat, and the cost is relatively low. Since the aperture of the guiding hole is larger than the outer diameter of the suction pipe, a gap is formed between the two. Then, the two ends are blocked by the two sliding sleeves to form an air suction cavity. The processing technology is simpler, and the coaxiality between the suction pipe and the guiding hole is ensured. Furthermore, the width of the air suction cavity is circumferentially uniform, and the air suction cavity has a larger passing area. When the suction pipe extends, the air extraction hole and the air passing hole only need to be communicated with the air suction cavity, without the need for the air extraction hole and the air passing hole to be precisely butted, reducing the requirement for the matching accuracy of the sliding seat and the suction pipe. At the same time, it avoids the limitation of the gas flow caused by the incomplete alignment of the air extraction hole and the air passing hole. When the suction pipe retracts, the air passing hole is blocked by the sliding sleeve. At this time, it is equivalent to the sliding seat blocking the hose of the air suction source, and there is no need to set up a solenoid valve to realize the on-off control of the air path.

[0012] In the above-mentioned plastic suction machine, a driving cylinder is fixed at the end of the sliding seat. The driving cylinder blocks one end of the guiding hole. The piston rod of the driving cylinder extends into the guiding hole and is fixedly connected to the inner end of the suction pipe. The suction pipe is controlled to expand and contract by the driving cylinder to ensure the stability of the expansion and contraction of the suction pipe and the accuracy of the stroke.

[0013] In the above-mentioned plastic suction machine, a number of guiding shafts are horizontally fixed on the frame. The number of guiding shafts is perpendicular to the moving direction of the lower mold. An adjusting seat is slidably sleeved on the guiding shafts. A long-strip-shaped adjusting frame is fixedly arranged along the length direction on the guide rail. An adjusting screw rod is vertically fixed on the adjusting frame. The adjusting screw rod vertically passes through the adjusting seat and is locked and fixed by a locking nut. The adjusting seat is locked and fixed on the guiding shaft by a locking bolt. The height position of the sliding seat can be adjusted by the adjusting screw rod, and the distance between the sliding seat and the lower mold can be adjusted by the adjusting seat. Furthermore, the relative position of the suction pipe and the lower mold when the suction pipe extends can be adjusted to be applicable to lower molds of different sizes and improve the applicability.

[0014] In the above-mentioned thermoforming machine, a film pressing cylinder vertically downward is fixed on the inner top surface of the upper mold. A template is horizontally fixed at the end of the piston rod of the film pressing cylinder. There is a gap between the edge of the template and the inner wall of the upper mold. When the upper mold descends and covers the lower mold, the film pressing cylinder can drive the template to descend and extend into the lower mold. When the upper mold covers the lower mold, the film pressing cylinder can drive the template to descend, and the template can downwardly press the plastic film sheet, thereby pressing the plastic film sheet into the lower mold. The downward pressing of the template can generate sufficient pressure on the plastic film sheet, avoiding the defect that it is difficult to be adsorbed due to the relatively thick plastic film sheet, pressing sufficient plastic film sheet into the lower mold, and making the plastic film sheet opposite to the core of the lower mold, avoiding uneven thickness caused by insufficient raw materials and improving the product forming quality.

[0015] In the above-mentioned thermoforming machine, there are two air blowing holes symmetrically opened on the top surface of the upper mold. Both of the two air blowing holes are located above the template and opposite to the upper side surface of the template. The upper mold has a relatively large inner cavity. The symmetric arrangement of the two air blowing holes can ensure sufficient air pressure and make the air flow uniform. And the air blowing holes are opposite to the upper side surface of the template, so that the blown air flow can act on the template and then spread around, rather than directly acting on the plastic film sheet, making the air flow uniform and avoiding a large impact on a local area of the plastic film sheet.

[0016] In the above-mentioned thermoforming machine, a liftable lifting plate is horizontally connected to the frame. A plurality of through holes are opened on the lifting plate. A plurality of guide rods are vertically fixed on the top surface of the upper mold. The plurality of guide rods respectively pass upward through the plurality of through holes, and a limit nut is screwed on the upper end of the guide rods. Buffer springs are sleeved on the guide rods, and the buffer springs are tensioned between the upper mold and the lifting plate. The cooperation between the guide rods and the through holes ensures the stability of the lifting of the upper mold. And the height position of the upper mold can be adjusted through the limit nut, thereby adjusting the cooperation degree between the upper mold and the lower mold when the upper mold descends and being applicable to lower molds of different heights. The buffer springs provide buffering for the descent of the upper mold, enabling the upper mold and the lower mold to abut and cooperate stably.

[0017] In the above-mentioned thermoforming machine, a driving structure capable of driving the lifting plate to lift is further provided on the frame, and when the upper mold abuts against the lower mold, the driving structure can drive the upper mold to move together with the lower mold. When the upper mold abuts against the lower mold, the driving structure can horizontally push and pull the upper mold, so that the upper mold and the lower mold move together.

[0018] In the auxiliary forming device of the above-mentioned plastic suction machine, the driving structure includes a driving motor, two first pull rods, two L-shaped swing rods, two connecting rods and a connecting plate. The middle parts of the two L-shaped swing rods are hinged to the frame, one end of the L-shaped swing rod faces upward, and the other end faces the side. The lower ends of the two connecting rods are both hinged to the connecting plate, and the upper ends are respectively hinged to one ends of the two L-shaped swing rods facing the side. The driving motor is fixed on the frame, and a driving gear is fixed to the output end of the driving motor. One end of one of the first pull rods is hinged to the eccentric position of the driving gear, and the other end is hinged to the upward end of one of the L-shaped swing rods. The two ends of the other first pull rod are respectively hinged to the upward ends of the two L-shaped swing rods. The lifting plate is fixedly connected to the connecting plate. The driving motor drives the driving gear to rotate. The driving gear can reciprocally push and pull the first pull rod, and the first pull rod can drive the L-shaped swing rod to reciprocally swing, so as to drive the connecting plate to reciprocally lift through the connecting rod, realizing the lifting of the upper die.

[0019] In the auxiliary forming device of the above-mentioned plastic suction machine, the driving mechanism further includes two second pull rods and a transmission rod. The middle part of the transmission rod is hinged to the frame. A transmission gear is also rotatably connected to the frame, and the transmission gear meshes with the driving gear. One end of one of the second pull rods is hinged to the eccentric position of the transmission gear, and the other end is hinged to the upper end of the transmission rod. One end of the other second pull rod is hinged to the middle part of one of the connecting rods, and the other end is hinged to the lower end of the transmission rod. Since the lower die is in a continuous moving state, when the upper die descends and abuts against the lower die, the upper die needs to stay on the lower die for a while to supply air to the upper die and suck air from the lower die. Therefore, the second pull rods and the transmission rod are provided. When the upper die descends, the transmission gear can push the upper second pull rod, and the upper second pull rod pushes and pulls the lower second pull rod through the transmission rod, so that the lower die reciprocally moves in the horizontal direction. This function needs to be combined with a buffer spring. The lifting plate is in continuous descending or ascending and does not stay. The upper die is slidably connected to the lifting plate through a guide rod. When the upper die abuts against the lower die, the lifting plate continues to descend and compresses the buffer spring, and then the lifting plate ascends and releases the buffer spring. During this process, the upper die always abuts against the lower die and moves with the lower die under the action of the second pull rod, so as to provide time for blowing air to the upper die and sucking air from the lower die.

[0020] In the auxiliary forming device of the above-mentioned plastic suction machine, a strip-shaped hole is formed in the lower end of the transmission rod along the length direction, and the other second pull rod is hinged to the transmission rod through an adjusting bolt passing through the strip-shaped hole. The hinged position of the second pull rod on the transmission rod can be adjusted through the adjusting bolt, so as to adjust the horizontal moving distance of the upper die, ensuring that the upper die stably abuts against the lower die and maintaining for a sufficient time. The driving structure can also adopt the method of a vertical screw rod and a horizontal screw rod, that is, the vertical screw rod drives the lifting plate to move up and down, and the horizontal screw rod drives the upper die to move with the lower die.

[0021] Compared with the prior art, the present plastic suction machine has the following advantages:

[0022] 1. Since the upper mold can descend and cover the lower mold, and the upper mold blows air downward, the air flow acts uniformly on the upper side of the plastic film, causing the plastic film to be uniformly stretched in advance, which has an auxiliary effect on the suction in the lower mold. That is, by combining the suction in the lower mold with the blowing in the upper mold, the plastic film is uniformly adhered to the core of the lower mold, improving the product quality.

[0023] 2. Since there is also a template in the upper mold, this template can press down, exerting sufficient pressure on the plastic film, avoiding the defect that it is difficult to be adsorbed due to the relatively thick plastic film. At the same time, enough plastic film is pressed into the lower mold, and the plastic film is made to face the core of the lower mold, avoiding uneven thickness caused by insufficient raw materials.

[0024] 3. Since the dragging force of the hose of the external vacuum source during the movement is applied to the sliding seat, and the sliding seat is restricted by the guide rail, this dragging force can be eliminated, and it will not affect the telescoping and stability of the suction pipe. It avoids the rotation and unilateral excessive wear of the suction pipe caused by lateral dragging, ensuring the accuracy of the telescoping position of the suction pipe and the stability of the docking with the connecting pipe on the mold.

[0025] 4. Since when the driving part drives the suction pipe to retract, the air passing hole or the air extraction hole can be blocked, realizing mechanical blocking, and there is no need for a solenoid valve to block the air path. Therefore, there is no need to install a solenoid valve, reducing the use of electrical control components, which not only reduces costs but also further improves stability.

[0026] 5. Since an air extraction hole for connecting the hose of the external vacuum source is opened on the sliding seat, a hose with a larger diameter can be connected, thus avoiding being restricted by the flow rate and improving the suction efficiency. Description of the Drawings

[0027] Figure 1 is a three-dimensional structural schematic diagram of a plastic suction machine.

[0028] Figure 2 is Figure 1 the enlarged structural view of part A in

[0029] Figure 3 is a structural sectional view of the plastic suction machine when the upper mold descends.

[0030] Figure 4 is Figure 1 the enlarged structural view of part B in

[0031] Figure 5 is a partial structural sectional view at the adjusting frame.

[0032] Figure 6 is a structural schematic diagram of the sliding seat and the suction pipe.

[0033] Figure 7 isFigure 3 Enlarged view of the structure at position C in the middle.

[0034] Figure 8 It is a sectional view of the structure when the suction pipe in the sliding seat retracts.

[0035] Figure 9 It is a partial sectional view of the plastic suction machine at the driving structure.

[0036] In the figure, 1 is the frame; 11 is the conveyor chain; 12 is the guide shaft; 13 is the transmission gear; 14 is the connecting shaft; 2 is the adjusting frame; 21 is the guide rail; 22 is the return cylinder; 23 is the limit post; 24 is the adjusting screw; 25 is the locking nut; 26 is the adjusting seat; 27 is the locking bolt; 3 is the lower mold; 31 is the suction hole; 32 is the connecting pipe; 4 is the upper mold; 41 is the blowing hole; 42 is the pipe joint; 43 is the guide rod; 44 is the limit nut; 45 is the buffer spring; 5 is the film pressing cylinder; 51 is the template; 511 is the plate body; 512 is the core; 6 is the lifting plate; 61 is the adjusting screw; 7 is the sliding seat; 71 is the guide hole; 72 is the extraction hole; 73 is the suction cavity; 74 is the slider; 75 is the sliding sleeve; 76 is the adjusting pad; 761 is the avoidance hole; 77 is the driving cylinder; 771 is the screw hole; 772 is the fixing bolt; 8 is the suction pipe; 81 is the air passing hole; 82 is the connecting part; 821 is the annular groove; 83 is the buffer gasket; 84 is the connecting flange; 9 is the driving structure; 91 is the driving motor; 911 is the driving gear; 92 is the first pull rod; 93 is the L-shaped swing rod; 931 is the rotating sleeve; 94 is the connecting rod; 95 is the connecting plate; 96 is the second pull rod; 97 is the transmission rod; 971 is the strip hole; 972 is the adjusting bolt. Detailed implementation mode

[0037] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0038] As Figure 1 shown, a plastic suction machine includes a frame 1, on which a conveyor chain 11 is provided. A plurality of lower molds 3 are connected to the conveyor chain 11. The plurality of lower molds 3 are arranged in sequence and move cyclically with the conveyor chain 11. When the lower mold 3 moves to the upper side, the opening of the lower mold 3 faces upward. The lower mold 3 is a concave mold with an inner concave mold core inside and has a flat upper end surface. A liftable lifting plate 6 is horizontally connected to the frame 1, and an upper mold 4 is connected to the lifting plate 6. The upper mold 4 is in a rectangular frame shape, and the opening of the upper mold 4 faces downward and has a flat lower end surface. Two blowing holes 41 are opened on the top surface of the upper mold 4. The two blowing holes 41 communicate with the inner cavity of the upper mold 4 and are symmetrically arranged. The outer ends of the two blowing holes 41 are both connected with pipe joints 42, and the pipe joints 42 are connected to an external blowing air source through a hose. The blowing air source can adopt an air pump or the like.

[0039] Specifically, in combination with Figure 2 As shown, a plurality of through holes are formed in the lifting plate 6, and a plurality of guide rods 43 are vertically fixed on the top surface of the upper die 4. The plurality of guide rods 43 respectively pass upward through the plurality of through holes. A limit nut 44 is screwed on the upper end of the guide rod 43. The limit nut 44 is located above the lifting plate 6. Buffer springs 45 are sleeved on the guide rods 43. The upper end of the buffer spring 45 abuts against the lower side surface of the lifting plate 6, and the lower end abuts against the upper side surface of the upper die 4. That is, the buffer spring 45 is tensioned between the upper die 4 and the lifting plate 6, so that the limit nut 44 abuts against the upper side surface of the lifting plate 6. In combination with Figure 3 As shown, a film pressing cylinder 5 is vertically fixed on the inner top surface of the upper die 4. A template 51 is fixed at the end of the piston rod of the film pressing cylinder 5. The template 51 includes a horizontally arranged plate body 511. The plate body 511 is rectangular and is located at the central position of the upper die 4 in the horizontal direction. The inner walls of the upper die 4 are all vertical surfaces. There is a gap between the edge of the plate body 511 and the inner wall of the upper die 4. Both blowing holes 41 are located above the plate body 511 and are opposite to the upper side surface of the plate body 511. A plurality of cores 512 are fixed on the lower side surface of the plate body 511. The cores 512 protrude downward. The shape of the cores 512 is adapted to the shape of the inner die core in the lower die 3. When the lower die 3 moves to be directly below the upper die 4, the upper die 4 can descend and cover the lower die 3. At this time, the lower end surface of the upper die 4 is in contact and abuts against the upper end surface of the lower die 3, and the upper die 4 covers the inner cavity of the lower die 3. The inner cavity of the upper die 4 and the inner cavity of the lower die 3 form a closed cavity. When the film pressing cylinder 5 drives the plate body 511 to descend, the cores 512 can extend into the lower die 3.

[0040] In combination with Figure 4 、 Figure 5As shown in the figure, an air suction hole 31 is formed on one side of the lower die 3, and the air suction hole 31 is communicated with the inner cavity of the lower die 3. A connecting pipe 32 is connected to the air suction hole 31. The connecting pipes 32 of two adjacent lower dies 3 face in opposite directions. Two pairs of guide shafts 12 are horizontally and fixedly arranged on the frame 1. The guide shafts 12 are perpendicular to the moving direction of the lower die 3, that is, the guide shafts 12 are arranged parallel to the connecting pipe 32. Adjusting seats 26 are slidably sleeved at both ends of the same pair of guide shafts 12. The adjusting seats 26 are locked and fixed on the guide shafts 12 through locking bolts 27. Through holes are vertically formed in the adjusting seats 26. On both sides of the conveyor chain 11 of the frame 1, long strip-shaped adjusting frames 2 are provided. Two adjusting screws 24 are vertically fixedly connected to the adjusting frames 2. The two adjusting screws 24 are respectively inserted into the through holes of the two adjusting seats 26 on the same side and are locked and fixed through locking nuts 25. Guide rails 21 are fixedly arranged on the adjusting frames 2, that is, there are two guide rails 21, and the two guide rails 21 are respectively located on both sides of the conveyor chain 11. The two guide rails 21 are both arranged along the moving direction of the lower die 3. A return cylinder 22 is fixed at one end of the guide rail 21 of the adjusting frame 2, and a limit post 23 is fixed at the other end. The return cylinder 22 is arranged along the length direction of the guide rail 21, and the piston rod of the return cylinder 22 faces the limit post 23. Combined with Figure 6 As shown in the figure, on the guide rails 21, sliding seats 7 are slidably connected through sliders 74. A guide hole 71 is formed in the sliding seat 7. The axial direction of the guide hole 71 is perpendicular to the guide rail 21. An air suction pipe 8 is slidably inserted into the guide hole 71, and the outer end of the air suction pipe 8 extends out of the guide hole 71 and faces the lower die 3. A driving cylinder 77 is fixed at one end of the sliding seat 7 away from the lower die 3. When the connecting pipe 32 of one lower die 3 is opposite to the air suction pipe 8 on one side of the sliding seat 7, the driving cylinder 77 can drive the air suction pipe 8 to extend out and be opposite to the connecting pipe 32. At this time, the lower die 3 drives the sliding seat 7 to move closer to the return cylinder 22. At this time, the air suction pipe 8 on the other side of the sliding seat 7 is used to be opposite to the connecting pipe 32 of the next adjacent lower die 3. The air suction pipes 8 on the two sliding seats 7 are alternately connected. When the air suction pipe 8 is separated from the connecting pipe 32 on the lower die 3, the return cylinder 22 can push the sliding seat 7 towards the limit post 23 for resetting the sliding seat 7.

[0041] Combined with Figure 7 、 Figure 8As shown, the aperture of the guiding hole 71 is larger than the outer diameter of the suction pipe 8. At both ends within the guiding hole 71, sliding sleeves 75 are fixed. The suction pipe 8 slidably penetrates through the two sliding sleeves 75, and the outer peripheral wall of the suction pipe 8 is in sliding guiding cooperation with the inner peripheral wall of the sliding sleeves 75. An air suction cavity 73 is formed between the two sliding sleeves 75. An air extraction hole 72 is formed on the top surface of the sliding seat 7. The inner end of the air extraction hole 72 penetrates through to the guiding hole 71 and is connected to the air suction cavity 73. The outer end of the air extraction hole 72 is connected with a pipe joint 42, and the pipe joint 42 is connected to an air suction source through a hose. The external air suction source can adopt conventional equipment such as a vacuum pump. On the side wall of the suction pipe 8, there are two air passing holes 81, one facing upward and the other facing downward. On the inner wall of the inner end orifice of the suction pipe 8, there is a circumferential connecting flange 84. At one end of the sliding seat 7 away from the lower die 3, an adjusting pad 76 is fixed. The adjusting pad 76 is fixed by bolts. An avoidance hole 761 is formed on the adjusting pad 76. The avoidance hole 761 is coaxially arranged with the guiding hole 71. The driving cylinder 77 is fixed on the adjusting pad 76 and blocks the avoidance hole 761. The piston rod of the driving cylinder 77 passes through the avoidance hole 761 and is butted against the end of the suction pipe 8. A threaded hole 771 is formed on the end face of the piston rod of the driving cylinder 77. A fixing bolt 772 passes through the inner hole of the connecting flange 84 and is screwed into the threaded hole 771 of the piston rod, realizing the fixation of the suction pipe 8 and the piston rod of the driving cylinder 77. At the same time, the locking bolt 27 blocks the inner hole of the connecting flange 84. The outer end of the suction pipe 8 has a tubular connecting portion 82. The connecting portion 82 is located outside the sliding seat 7. The inner diameter of the connecting portion 82 is larger than the inner diameter of the suction pipe 8. The edge of the outer end orifice of the connecting portion 82 has a circumferential bevel chamfer, thus forming a flared shape. On the inner wall of the connecting portion 82, there is a circumferential annular groove 821. An annular buffer gasket 83 is clamped in the annular groove 821. The buffer gasket 83 is made of rubber material and abuts against the end face of the suction pipe 8. The driving cylinder 77 can drive the suction pipe 8 to expand and contract. When the driving cylinder 77 drives the suction pipe 8 to extend outwards, the air passing holes 81 move into the air suction cavity 73 and are connected to the air suction cavity 73, and the upward air passing hole 81 is opposite to the air extraction hole 72. When the driving cylinder 77 drives the suction pipe 8 to retract inwards, the air passing holes 81 move into the sliding sleeve 75 and are blocked by the inner peripheral surface of the sliding sleeve 75.

[0042] Combined with Figure 9As shown in the figure, a driving structure 9 capable of driving the lifting plate 6 to lift is further provided on the frame 1. The driving structure 9 includes a driving motor 91, two first pull rods 92, two L-shaped swing rods 93, two connecting rods 94 and a connecting plate 95. Two connecting shafts 14 are horizontally fixed on the frame 1, and both of the two connecting shafts 14 are perpendicular to the moving direction of the lower die 3. Rotating sleeves 931 are fixed at the corner positions of the two L-shaped swing rods 93, and the rotating sleeves 931 of the two L-shaped swing rods 93 are respectively rotatably sleeved on the two connecting shafts 14, so that one end of the L-shaped swing rod 93 faces upward and the other end faces the side of the rotating sleeve 931. The lower ends of the two connecting rods 94 are respectively hinged on the upper side surface of the connecting plate 95, and the upper ends are respectively hinged to the ends of the two L-shaped swing rods 93 facing the side. Two adjusting screws 61 are vertically fixed on the upper side surface of the lifting plate 6. The upper ends of the two adjusting screws 61 pass through the connecting plate 95 and are screwed and fixed to the connecting plate 95. The driving motor 91 is fixed on the frame 1, and a driving gear 911 is fixed at the output end of the driving motor 91. One end of one of the first pull rods 92 is hinged at the eccentric position of the driving gear 911, and the other end is hinged to the upward end of one of the L-shaped swing rods 93. The two ends of the other first pull rod 92 are respectively hinged to the upward ends of the two L-shaped swing rods 93. The driving mechanism 9 further includes two second pull rods 96 and a transmission rod 97. The middle of the transmission rod 97 is hinged on the frame 1. A strip-shaped hole 971 is opened along the length direction at the lower end of the transmission rod 97. A transmission gear 13 is also rotatably connected on the frame 1. The transmission gear 13 is located above the driving gear 911 and meshes with the driving gear 911. One end of one of the second pull rods 96 is hinged at the eccentric position of the transmission gear 13, and the other end is hinged to the upper end of the transmission rod 97. One end of the other second pull rod 96 is hinged to the middle of one of the connecting rods 94, and the other end is hinged to the transmission rod 97 through an adjusting bolt 972 passing through the strip-shaped hole 971.

[0043] During operation, when a lower mold 3 moves to directly below an upper mold 4, the connecting pipe 32 of the lower mold 3 faces the connection part 82 of an intake pipe 8 on one side. A driving cylinder 77 drives the intake pipe 8 to extend. The connection part 82 of the intake pipe 8 can be sleeved on the end of the connecting pipe 32. The end of the connecting pipe 32 abuts against a buffer gasket 83 to achieve sealing between the two. At the same time, the lower mold 3 moves together with a sliding seat 7. While the intake pipe 8 extends, a through-hole 81 communicates with an intake cavity 73. Meanwhile, a driving structure 9 drives the upper mold 4 to descend and cover the lower mold 3, and the driving structure 9 pushes the upper mold 4 to move together with the lower mold 3. The lower end face of the upper mold 4 and the upper end face of the lower mold 3 press a plastic film tightly. A film pressing cylinder 5 drives a template 51 to descend and press down the plastic film. The plastic film is stretched and pressed into the lower mold 3. At the same time, a blowing air source blows air into the inner cavity of the upper mold 4 through a blow hole 41, and an intake air source sucks air from the inner cavity of the lower mold 3 through the intake pipe 8. Blister molding of a product is achieved through the positive pressure inside the upper mold 4 and the negative pressure inside the lower mold 3. After blister molding is completed, the upper mold 4 rises and resets. The driving cylinder 77 drives the intake pipe 8 to retract and reset. The intake pipe 8 separates from the connecting pipe 32, and after retracting, the through-hole 81 enters a sliding sleeve 75 and is blocked by the inner peripheral wall of the sliding sleeve 75. A reset cylinder 22 pushes the sliding seat 7 to move and reset.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0045] Although terms such as a frame 1, a conveyor chain 11, a guide shaft 12, etc. are used more frequently herein, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A plastic suction machine, comprising a frame (1), wherein a lower mold (3) which can move and has an upward opening is arranged on the frame (1), and the lower mold (3) is provided with suction holes (31) communicated with the inner cavity. It is characterized in that, The frame (1) is slidably connected to a slide seat (7), and a suction pipe (8) is slidably inserted on the slide seat (7) and can be connected to the suction hole (31) when extended. The slide seat (7) is provided with an exhaust hole (72) for connecting to a suction air source and can be connected to the suction pipe (8) when the suction pipe (8) is extended. The frame (1) is provided with an upper mold (4) that can be raised and lowered and has an opening facing downward, and can cover the lower mold (3) when the upper mold (4) is lowered. The upper mold (4) is also provided with a blowing hole (41) that is connected to the inner cavity and is used to connect to a blowing air source.

2. The plastic suction machine according to claim 1, characterized in that, The frame (1) is provided with a guide rail (21) arranged along the moving direction of the lower mold (3), the slide seat (7) is slidably connected to the guide rail (21), one end of the guide rail (21) is provided with a reset cylinder (22), and the other end is provided with a limit column (23), the piston rod of the reset cylinder (22) faces the limit column (23), when the suction pipe (8) is connected to the suction hole (31) of the lower mold (3), the lower mold (3) can move with the suction pipe (8) to the end where the reset cylinder (22) is located.

3. The plastic suction machine according to claim 2, characterized in that, The slide seat (7) is provided with a guide hole (71), the exhaust hole (72) is connected to the guide hole (71), the suction pipe (8) is slidably arranged in the guide hole (71), and the side wall of the suction pipe (8) is provided with an air hole (81), and when the suction pipe (8) is extended and connected with the suction hole (31) of the lower mold (3), the air hole (81) can be connected with the exhaust hole (72), and when the suction pipe (8) is retracted inward, the air hole (81) can be blocked.

4. The plastic suction molding machine according to claim 3, wherein, The aperture of the guide hole (71) is larger than the outer diameter of the suction pipe (8), and sliding sleeves (75) are fixed at both ends of the guide hole (71). The suction pipe (8) slides through the two sliding sleeves (75), and a suction cavity (73) is formed between the end surfaces of the two sliding sleeves (75). The above-mentioned air extraction hole (72) is connected with the suction cavity (73). When the suction pipe (8) is extended and connected with the suction hole (31) of the lower mold (3), the air hole (81) can be connected with the suction cavity (73). When the suction pipe (8) is retracted inward, the air hole (81) is blocked by the inner circumference of one of the sliding sleeves (75).

5. The plastic suction machine according to claim 3 or 4, characterized in that, A driving cylinder (77) is fixed to the end of the slide seat (7), and the driving cylinder (77) blocks one end of the guide hole (71). The piston rod of the driving cylinder (77) extends into the guide hole (71) and is fixedly connected to the inner end of the suction pipe (8).

6. The plastic suction machine according to claim 2 or 3 or 4, characterized in that, A plurality of guide shafts (12) are horizontally fixed on the frame (1), the plurality of guide shafts (12) are perpendicular to the moving direction of the lower mold (3), an adjustment seat (26) is slidably sleeved on the guide shaft (12), an adjustment frame (2) is fixed on the guide rail (21) along the length direction, an adjustment screw (24) is vertically fixed on the adjustment frame (2), the adjustment screw (24) vertically passes through the adjustment seat (26) and is locked and fixed by a locking nut (25), and the adjustment seat (26) is locked and fixed on the guide shaft (12) by a locking bolt (27).

7. The plastic suction machine according to any one of claims 1 to 4, characterized in that, A film pressing cylinder (5) vertically downward is fixed on the inner top surface of the upper die (4). A template (51) is horizontally fixed at the end of the piston rod of the film pressing cylinder (5). There is a gap between the edge of the template (51) and the inner wall of the upper die (4). When the upper die (4) descends and covers the lower die (3), the film pressing cylinder (5) can drive the template (51) to descend and extend into the lower die (3).

8. The plastic suction machine according to claim 7, characterized in that There are two air blowing holes (41) symmetrically arranged on the top surface of the upper die (4). Both of the two air blowing holes (41) are located above the template (51) and opposite to the upper side surface of the template (51).

9. The plastic suction machine according to claim 7, characterized in that, A liftable lifting plate (6) is horizontally connected to the frame (1). A number of through holes are formed in the lifting plate (6). A number of guide rods (43) are vertically fixed on the top surface of the upper die (4). The number of guide rods (43) respectively pass upward through the number of through holes, and a limit nut (44) is screwed at the upper end of the guide rod (43). Buffer springs (45) are sleeved on the guide rods (43). The buffer springs (45) are tensioned between the upper die (4) and the lifting plate (6).

10. The plastic suction machine according to claim 9, characterized in that, A driving structure (9) capable of driving the lifting plate (6) to lift is further provided on the frame (1). When the upper die (4) abuts against the lower die (3), the driving structure (9) can drive the upper die (4) to move together with the lower die (3).

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