Auxiliary forming device of a plastic vacuum forming machine

Abstract

The application provides an auxiliary forming device of a plastic suction machine, and belongs to the technical field of mechanical equipment. The auxiliary forming device of the plastic suction machine solves the problem of poor product quality of the existing plastic suction machine. The auxiliary forming device of the plastic suction machine, the plastic suction machine comprising a rack and a lower mold arranged on the rack and having an opening facing upward, the lower mold being provided with a suction hole in communication with an inner cavity and used for connecting a suction gas source, the auxiliary forming device comprising an upper mold connected to the rack and capable of ascending and descending, the upper mold having an opening facing downward and capable of covering the lower mold when the upper mold descends, the upper mold being provided with a mold plate capable of ascending and descending and capable of extending into the lower mold when descending, and the upper mold being further provided with a blowing hole in communication with the inner cavity and used for connecting a blowing gas source. The plastic suction machine has good product quality.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical equipment and relates to an auxiliary forming device of a plastic suction machine. BACKGROUND

[0002] The plastic suction machine, also known as a thermoforming machine, is a machine for sucking and forming various packaging and decoration boxes and frames from a roll of heated and plasticized PVC, PE, PP, PET and HIPS. The machine uses the vacuum suction force generated by a vacuum pump to suck and form various vacuum covers, suction trays and bubble shells from a heated and softened thermoplastic sheet through a mold. Therefore, the plastic suction machine at least includes a mold and a suction member capable of sucking air in the inner cavity of the mold.

[0003] As disclosed in the patent document (application number: 201811145094.6), the circulating plastic suction mechanism includes a conveying type plastic suction workbench and a sliding vacuum suction device. A plurality of circulating plates are arranged on the conveying chain of the conveying type plastic suction workbench. The circulating plate includes a mold plate with an inner cavity. An air suction pipe in communication with the inner cavity is arranged on the mold plate. The sliding vacuum suction device includes a sliding rail. A film pressing cylinder is arranged at one end of the sliding rail. An air suction butt joint pipe is arranged on the piston rod of the film pressing cylinder. The air inlet of the air suction butt joint pipe is connected to a vacuum suction pump through a hose and an electromagnetic valve. When the air suction pipe on the mold plate is opposite to the air suction butt joint pipe, the film pressing cylinder drives the air suction butt joint pipe to extend and butt joint with the air suction pipe. The electromagnetic valve controls the vacuum suction pump to suck air in the inner cavity of the mold plate.

[0004] Since the plastic film sheet passes above the mold plate and covers the mold plate as much as possible, there is still a gap between the plastic film sheet and the mold plate in the actual production process. The suction force generated by the air suction pipe is easy to leak, which makes it difficult for the plastic film sheet to be quickly sucked and adhered. Of course, if the product has a higher thickness requirement, the plastic film sheet itself will be thicker, which will also make it difficult to stretch the plastic film sheet. In order to improve the production efficiency, a mold plate usually forms a plurality of products by plastic suction. Therefore, the volume of the mold plate is usually large. The air suction pipe is connected to the air suction device on the mold plate. The air suction pipe is only at a certain position relative to the large mold plate. Therefore, the position connected to the air suction pipe forms a vacuum first during suction, and the vacuum degree is also large. The plastic film sheet is first stretched and adhered to the mold plate, and then adhered to other positions. That is, the vacuum formed in the inner cavity of the entire mold plate is not uniform, which makes the plastic film sheet not stretch uniformly and the thickness of the adhesion not uniform, affecting the product quality.

[0005] And for the problem that the plastic film is difficult to be adsorbed, the person skilled in the art will naturally think of reducing the air leakage between the plastic film and the mold, so the way of pressing foot is adopted to press the edge of the plastic film, so that the plastic film is close to the mold, the air leakage is reduced, and the air suction power to the mold is increased, such as increasing the pipe diameter of the air suction pipe, and for the problem that the vacuum in the cavity of the mold is not uniform, the person skilled in the art will easily think of increasing the number of air suction pipes on the basis of increasing the pipe diameter of the air suction pipe, and the multiple air suction pipes are uniformly distributed, that is, the air suction amount is increased, and the air flow in the cavity of the mold is more uniform. SUMMARY

[0006] The purpose of the present application is to solve the problem of poor product quality of the existing plastic suction machine forming device.

[0007] The purpose of the present application can be realized by the following technical scheme: an auxiliary forming device of a plastic suction machine, the plastic suction machine comprising a rack and a lower mold arranged on the rack and having an opening facing upward, the lower mold being provided with an air suction hole connected with an inner cavity and used for connecting an air suction source, characterized in that the auxiliary forming device comprises an upper mold connected with the rack and capable of ascending and descending, the upper mold having an opening facing downward and being capable of covering the lower mold when the upper mold descends, the upper mold being provided with a mold plate capable of ascending and descending and being capable of extending into the lower mold when descending, and the upper mold being further provided with a gas blowing hole connected with the inner cavity and used for connecting a gas blowing source.

[0008] The lower mold is provided with a concave mold core with an inner side surface adapted to the shape of the product, and the corresponding product is formed by adhering the plastic film to the concave mold. The air suction source can be a vacuum pump or the like, and the air blowing source can be an air pump or the like. When the plastic film is covered on the upper mold, the upper mold is lowered and covers the lower mold, and the inner cavities of the upper mold and the lower mold form a substantially closed cavity. The mold plate can be lowered to press the plastic film downward, so as to press the plastic film into the lower mold. In this process, the air blowing source can be connected to the air suction hole of the lower mold, and the air blowing hole is connected to the air blowing source. The air blowing source blows air into the upper mold through the air blowing hole, so that the upper mold is filled with air and forms a positive pressure. The positive pressure airflow 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 source sucks the air in the inner cavity of the lower mold through the air suction hole. When the gas below the plastic film is sucked and vacuumized, the plastic film can be adhered to the lower mold core to form the product. When the upper mold covers the lower mold, it can press the plastic film tightly, so as to avoid air leakage between the plastic film and the lower mold. At the same time, the lower pressure of the mold plate can generate enough pressure on the plastic film, avoiding the defect that the plastic film is difficult to be adsorbed due to its thickness. The plastic film is pressed into the lower mold, and the plastic film is opposite to the lower mold core, avoiding the insufficient raw material from causing uneven thickness. The upper mold blows air downward, and the airflow uniformly acts on the upper side of the plastic film, so that the plastic film is uniformly stretched in advance. The air suction in the lower mold and the air blowing in the upper mold have an auxiliary effect, that is, the plastic film is uniformly adhered to the lower mold core by combining the air suction in the lower mold and the air blowing in the upper mold, improving the product quality.

[0009] In the auxiliary forming device of the vacuum forming machine, the lower end surface of the upper mold abuts against the upper end surface of the lower mold when the upper mold is lowered, and the inner cavity of the lower mold is covered by the upper mold. The lower end port of the upper mold is adapted to the shape of the upper end port of the lower mold, so that a substantially closed inner cavity is formed after the upper mold covers the lower mold, avoiding air leakage when the upper mold blows air, so that the upper mold forms a uniform downward air pressure on the plastic film. At the same time, the upper mold can press the plastic film tightly on the lower mold, so as to avoid air leakage when the lower mold sucks air.

[0010] In the auxiliary forming device of the vacuum forming machine, the inner top surface of the upper mold is fixed with a vertical downward film pressing air cylinder, the mold plate is horizontally fixed at the end of the piston rod of the film pressing air cylinder, and the edge of the mold plate has a gap with the inner wall of the upper mold. After the upper mold is lowered, the film pressing air cylinder drives the mold plate to lower and press the plastic film, and the gap between the mold plate and the inner wall of the upper mold is used for airflow to pass through. The airflow can uniformly act downward on the plastic film from the four sides of the mold plate.

[0011] In the auxiliary forming device of the blister machine, the upper mold is in the shape of a rectangular frame, and the mold plate is in the shape of a rectangular plate and is located at the center of the upper mold in the horizontal direction. The gap between the mold plate located at the center and the inner wall of the upper mold is more uniform, and the downward airflow is more uniform.

[0012] In the auxiliary forming device of the blister machine, the mold plate includes a plate body arranged horizontally and a core fixed to the lower side of the plate body and protruding downward, and the core can extend into the lower mold when the mold plate descends. The shape of the core is adapted to the shape of the concave mold core in the lower mold, so that the core can make the plastic film uniformly approach the uneven concave mold core in the lower mold when the mold plate presses the plastic film downward, and then quickly adsorb the plastic film when the suction hole sucks air, avoiding air leakage.

[0013] In the auxiliary forming device of the blister machine, the two blow holes are symmetrically arranged on the top surface of the upper mold, and the two blow holes are located above the mold plate and opposite to the upper side of the mold plate. The upper mold has a large inner cavity, and the two blow holes are symmetrically arranged to ensure sufficient air pressure and uniform airflow. The blow hole is opposite to the upper side of the mold plate, so that the airflow blown by the blow hole can act on the mold plate and diffuse to the surrounding, instead of directly acting on the plastic film, so that the airflow is uniform and the local impact on the plastic film is avoided.

[0014] In the auxiliary forming device of the blister machine, the frame is horizontally connected with a lifting plate that can be lifted and lowered, the lifting plate is provided with a plurality of guide holes, a plurality of guide rods are vertically fixed on the top surface of the upper mold, the plurality of guide rods respectively pass through the plurality of guide holes upward, and a limiting nut is screwed on the upper end of the guide rod. A buffer spring is sleeved on the guide rod, and the buffer spring is tensioned between the upper mold and the lifting plate. The guide rod cooperates with the guide hole to ensure the stability of the lifting of the upper mold, and the height position of the upper mold can be adjusted by the limiting nut, so as to adjust the cooperation degree of the upper mold and the lower mold when the upper mold descends, and be suitable for lower molds of different heights. The buffer spring provides buffer for the descent of the upper mold, so that the upper mold and the lower mold are stably matched.

[0015] In the auxiliary forming device of the blister machine, the driving structure comprises a driving motor, two 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 hingedly connected to the frame, one end of each of the L-shaped swing rods faces upward, and the other end of each of the L-shaped swing rods faces the side, the lower ends of the two connecting rods are hingedly connected to the connecting plate, and the upper ends of the two connecting rods are respectively hingedly connected to one end of each of the two L-shaped swing rods facing the side, the driving motor is fixed to the frame, and a driving gear is fixed to the output end of the driving motor, one end of one of the pull rods is hingedly connected to the eccentric position of the driving gear, and the other end of the pull rod is hingedly connected to one end of one of the L-shaped swing rods facing upward, the two ends of the other pull rod are respectively hingedly connected to one end of each of the two L-shaped swing rods facing upward, and the lifting plate is fixedly connected to the connecting plate. The driving motor drives the driving gear to rotate, the driving gear can reciprocatingly push and pull the pull rod, the pull rod can reciprocatingly swing the L-shaped swing rod, and the connecting plate is driven by the connecting rod to reciprocatingly lift, so that the upper die is lifted and lowered.

[0016] In the auxiliary forming device of the blister machine, the driving mechanism further comprises two pull rods and a transmission rod, the middle part of the transmission rod is hingedly connected to the frame, and a transmission gear is rotatably connected to the frame and engaged with the driving gear, one end of one of the pull rods is hingedly connected to the eccentric position of the transmission gear, the other end of the pull rod is hingedly connected to the upper end of the transmission rod, one end of the other pull rod is hingedly connected to the middle part of one of the connecting rods, and the other end of the pull rod is hingedly connected to the lower end of the transmission rod. Since the lower die is in a continuous moving state, when the upper die is lowered and abuts against the lower die, the upper die needs to stay on the lower die for a moment to provide time for the upper die to blow air and the lower die to suck air, and therefore the pull rod and the transmission rod are arranged, when the upper die is lowered, the transmission gear can push the pull rod above, the pull rod above pushes and pulls the pull rod below through the transmission rod, so that the lower die reciprocatingly moves in the horizontal direction, and this function needs to be combined with the buffer spring, the lifting plate continuously descends or ascends and does not stay, and the upper die and the lifting plate are slidably connected through the guide rod, when the upper die abuts against the lower die, the lifting plate continues to descend and compresses the buffer spring, then the lifting plate ascends and releases the buffer spring, and in this process, the upper die always abuts against the lower die and moves with the lower die under the action of the pull rod, so as to provide time for the upper die to blow air and the lower die to suck air.

[0017] In the auxiliary forming device of the blister machine, the lower end of the transmission rod is provided with a strip-shaped hole in the length direction, and the other pull rod is hingedly connected to the transmission rod through the strip-shaped hole and the adjusting bolt. The hinged position of the pull rod on the transmission rod can be adjusted through the adjusting bolt, so that the horizontal moving distance of the upper die is adjusted, and the upper die and the lower die are stably abutted and kept for a sufficient time. The transmission structure can also adopt a vertical screw rod and a horizontal screw rod, that is, the vertical screw rod drives the lifting plate to ascend and descend, and the horizontal screw rod drives the upper die to move with the lower die.

[0018] Compared with the prior art, the auxiliary forming device of the blister machine has the following advantages:

[0019] 1、Since the upper mold can be lowered and covered on the lower mold, and the upper mold blows air downward, the air flow uniformly acts on the upper side of the plastic film, so that the plastic film is uniformly stretched in advance, and the suction in the lower mold is assisted, that is, the suction in the lower mold and the blowing in the upper mold are combined, so that the plastic film is uniformly adhered to the lower mold core, and the product quality is improved.

[0020] 2、Since the upper mold also has a mold plate, the mold plate can be pressed down to generate enough pressure on the plastic film, avoiding the defect that the plastic film is difficult to be adsorbed due to its thickness, and at the same time, enough plastic film is pressed into the lower mold, and the plastic film is opposite to the lower mold core, avoiding the insufficient raw material leading to uneven thickness.

[0021] 3、Since the upper mold blowing and the mold plate pressing are combined, that is, the mold plate pressing can make the plastic film deform and be stretched to a certain extent, so that the plastic film forms a concave side, and at this time, the upper mold blowing can better act on the plastic film and make it uniformly stretched.

[0022] 4、Since the lower end surface of the upper mold and the upper end surface of the lower mold are fitted and abutted when the upper mold is lowered, the upper mold can press the plastic film tightly on the lower mold, thereby avoiding air leakage when the lower mold sucks air. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the three-dimensional structure of the plastic suction machine.

[0024] Figure 2 is a structure sectional view of the plastic suction machine when the upper mold is lowered.

[0025] Figure 3 is Figure 1 is an enlarged view of the structure at A in the plastic suction machine.

[0026] Figure 4 is Figure 2 is an enlarged view of the structure at B in the plastic suction machine.

[0027] Figure 5 is a local structure sectional view of the plastic suction machine at the driving structure.

[0028] In the figure, 1, rack; 11, conveying chain; 12, guide rail; 13, transmission gear; 14, connecting shaft; 2, lower mold; 21, air suction hole; 22, connecting pipe; 3, upper mold; 31, air blowing hole; 32, pipe joint; 33, guide rod; 34, limiting nut; 35, buffer spring; 4, film pressing cylinder; 41, mold plate; 411, plate body; 412, core; 5, lifting plate; 51, adjusting screw rod; 6, air suction device; 61, sliding seat; 611, guide hole; 612, air suction cavity; 613, air suction hole; 62, air suction pipe; 621, air passing hole; 63, driving cylinder; 64, sliding sleeve; 7, driving structure; 71, driving motor; 711, driving gear; 72, pull rod one; 73, L-shaped swing rod; 731, rotating sleeve; 74, connecting rod; 75, connecting plate; 76, pull rod two; 77, transmission rod; 771, strip-shaped hole; 772, adjusting bolt. DETAILED DESCRIPTION

[0029] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0030] As shown in Figure 1 , Figure 2 , an auxiliary forming device of a vacuum forming machine, the vacuum forming machine comprising a rack 1, the rack 1 being provided with a conveying chain 11, a plurality of lower molds 2 being connected to the conveying chain 11, the plurality of lower molds 2 being arranged in sequence and moving circularly with the conveying chain 11, when the lower mold 2 moves to the upper side, the opening of the lower mold 2 faces upward, the lower mold 2 is a concave mold with a concave mold core on the inner side and has a flat upper end face, an air suction hole 21 is formed in the side part of the lower mold 2, the air suction hole 21 is communicated with the inner cavity of the lower mold 2, and a connecting pipe 22 is connected at the air suction hole 21, the connecting pipe 22 is used to connect with an external air suction source through an air suction device 6, and the air suction source can adopt a vacuum pump or other vacuum equipment. The auxiliary forming device comprises an upper mold 3, the upper mold 3 is connected to the rack 1 and can be lifted and lowered, the upper mold 3 is in the shape of a rectangular frame, the opening of the upper mold 3 faces downward, and the upper mold 3 has a flat lower end face, two air blowing holes 31 are formed in the top surface of the upper mold 3, the two air blowing holes 31 are communicated with the inner cavity of the upper mold 3 and are symmetrically arranged, the outer ends of the two air blowing holes 31 are connected with pipe joints 32, the pipe joints 32 are connected with an external air blowing source through a hose, the air blowing source can adopt an air pump or the like, a film pressing cylinder 4 is fixed on the inner top surface of the upper mold 3 and vertically downward, a mold plate 41 is fixed on the piston rod end of the film pressing cylinder 4, the mold plate 41 is horizontally arranged, when the lower mold 2 moves to the lower side of the upper mold 3 and faces directly, the upper mold 3 can be lowered and covered on the lower mold 2, at this time, the lower end face of the upper mold 3 is in close contact with the upper end face of the lower mold 2, and the inner cavity of the upper mold 3 covers the inner cavity of the lower mold 2, the inner cavity of the upper mold 3 and the inner cavity of the lower mold 2 form a closed cavity, and the mold plate 41 is opposite to the lower mold 2, and the film pressing cylinder 4 can drive the mold plate 41 to descend.

[0031] Specifically, in combination with Figure 3 As shown in the drawings, the lifting plate 5 is horizontally connected to the rack 1 and can be lifted, the lifting plate 5 is provided with a plurality of through holes, the top surface of the upper die 3 is vertically fixed with a plurality of guide rods 33, the plurality of guide rods 33 respectively pass through the plurality of through holes upward, the upper end of the guide rod 33 is screwed with a limiting nut 34, the limiting nut 34 is located above the lifting plate 5, the guide rod 33 is sleeved with a buffer spring 35, the upper end of the buffer spring 35 abuts on the lower side of the lifting plate 5, and the lower end abuts on the upper side of the upper die 3, that is, the buffer spring 35 is tightly expanded between the upper die 3 and the lifting plate 5, so that the limiting nut 34 abuts on the upper side of the lifting plate 5. The template 41 comprises a horizontally arranged plate body 411, the plate body 411 is rectangular, and the plate body 411 is located at the central position in the horizontal direction of the upper die 3, the inner wall of the upper die 3 is a vertical surface, and the plate body 411 has a gap between the edge and the inner wall of the upper die 3, a plurality of cores 412 are fixed on the lower side of the plate body 411, the cores 412 protrude downward, the shape of the core 412 is adapted to the shape of the concave core in the lower die 2, and the core 412 can extend into the lower die 2 when the upper die 3 is covered on the lower die 2 and the plate body 411 is lowered. The two air blowing holes 31 are located above the plate body 411 and opposite to the upper side of the plate body 411.

[0032] In combination with Figure 4 As shown in the drawings, the connecting pipe 22 of the lower die 2 is connected with the vacuum air source through the air suction device 6, and the air suction device 6 comprises a sliding seat 61, an air suction pipe 62 and a driving cylinder 63, the guide rail 12 is fixed on the rack 1, the sliding seat 61 is slidingly connected to the guide rail 12, the guide hole 611 penetrating through both ends is formed in the sliding seat 61, the sliding sleeve 64 is fixed at both ends in the guide hole 611, the air suction pipe 62 is slidingly arranged in the two sliding sleeves 64, one end of the air suction pipe 62 extends out of one end of the sliding seat 61, the driving cylinder 63 is fixed at the other end of the sliding seat 61, and the piston rod of the driving cylinder 63 is fixedly connected with the other end of the air suction pipe 62, the air suction cavity 612 is formed between the two sliding sleeves 64, the air suction hole 613 is formed in the top surface of the sliding seat 61, the inner end of the air suction hole 613 is communicated with the air suction cavity 612, the outer end is connected with the air suction source through the hose, the air passing hole 621 is formed in the side wall of the air suction pipe 62, when the driving cylinder 63 drives the air suction pipe 62 to extend outward and connect and communicate with the connecting pipe 22 of the lower die 2, the air passing hole 621 moves into the air suction cavity 612 and communicates with the air suction cavity 612, when the driving cylinder 63 drives the air suction pipe 624 to retract inward, the air passing hole 621 moves into the sliding sleeve 64 and is blocked by the inner wall of the sliding sleeve 64.

[0033] In combination with Figure 5As shown, the rack 1 is further provided with a driving structure 7 capable of driving the lifting plate 5 to lift, the driving structure 7 comprises a driving motor 71, two pull rods 72, two L-shaped swing rods 73, two connecting rods 74 and a connecting plate 75, the rack 1 is horizontally fixed with two connecting shafts 14, the two connecting shafts 14 are both perpendicular to the moving direction of the lower mold 2, the rotating sleeve 731 of the two L-shaped swing rods 73 is fixed at the rotating position, the rotating sleeve 731 of the two L-shaped swing rods 73 is rotatably sleeved on the two connecting shafts 14 respectively, so that one end of the L-shaped swing rod 73 is upward and the other end is towards the side of the rotating sleeve 731, the lower ends of the two connecting rods 74 are both hingedly connected on the upper side of the connecting plate 75, the upper ends are both hingedly connected with one end of the two L-shaped swing rods 73 towards the side, and the upper side of the lifting plate 5 is vertically fixed with two adjusting screws 51, the upper ends of the two adjusting screws 51 pass through the connecting plate 75 and are screw-fixed with the connecting plate 75, the driving motor 71 is fixed on the rack 1, and the output end of the driving motor 71 is fixed with a driving gear 711, one end of one of the pull rods 72 is hingedly connected at the eccentric position of the driving gear 711, and the other end is hingedly connected with one end of one of the L-shaped swing rods 73 upward, and the two ends of the other pull rod 72 are respectively hingedly connected with one end of the two L-shaped swing rods 73 upward. The driving mechanism 7 further comprises two pull rods 76 and a transmission rod 77, the middle part of the transmission rod 77 is hingedly connected on the rack 1, the lower end of the transmission rod 77 is provided with a strip-shaped hole 771 along the length direction, the rack 1 is further rotatably connected with a transmission gear 13, the transmission gear 13 is located above the driving gear 711 and is engaged with the driving gear 711, one end of one of the pull rods 76 is hingedly connected with the eccentric position of the transmission gear 13, and the other end is hingedly connected with the upper end of the transmission rod 77, one end of the other pull rod 76 is hingedly connected with the middle part of one of the connecting rods 74, and the other end is hingedly connected on the transmission rod 77 through an adjusting bolt 772 passing through the strip-shaped hole 771.

[0034] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0035] Although the terms such as rack 1, conveying chain 11, guide rail 12 and the like are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present application; any interpretation of them as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. An auxiliary forming device for a vacuum forming machine, the vacuum forming machine comprising a frame (1) and a lower mold (2) disposed on the frame (1) with its opening facing upward, the lower mold (2) having an air suction hole (21) communicating with an inner cavity and used for connecting to an air suction source, characterized in that, The auxiliary molding device includes an upper mold (3) connected to the frame (1) and capable of being raised and lowered. The opening of the upper mold (3) faces downward and can cover the lower mold (2) when the upper mold (3) is lowered. The upper mold (3) is provided with a template (41) that can be raised and lowered and can extend into the lower mold (2) when it is lowered. The upper mold (3) is also provided with an air blowing hole (31) that communicates with the inner cavity and is used to connect to the air blowing source. A lifting plate (5) that can be raised and lowered is horizontally connected to the frame (1). The frame (1) is provided with a lifting plate that can carry... The driving structure (7) for lifting the movable lifting plate (5) includes a drive motor (71), two pull rods (72), two L-shaped swing rods (73), two connecting rods (74), and a connecting plate (75). The middle part of the two L-shaped swing rods (73) is hinged to the frame (1), and one end of the L-shaped swing rod (73) faces upward and the other end faces to the side. The lower ends of the two connecting rods (74) are both hinged to the connecting plate (75), and the upper ends are respectively hinged to the side ends of the two L-shaped swing rods (73). The machine (71) is fixed on the frame (1), and the output end of the drive motor (71) is fixed with a drive gear (711). One end of one of the pull rods (72) is hinged to the eccentric position of the drive gear (711), and the other end is hinged to the upward end of one of the L-shaped swing rods (73). The two ends of the other pull rod (72) are respectively hinged to the upward ends of the two L-shaped swing rods (73). The lifting plate (5) is fixed on the connecting plate (75). The drive structure (7) also includes two pull rods (76) and A transmission rod (77) is hinged in the middle to a frame (1). A transmission gear (13) is also rotatably connected to the frame (1). The transmission gear (13) meshes with a drive gear (711). One end of a tie rod (76) is hinged to the eccentric position of the transmission gear (13), and the other end is hinged to the upper end of the transmission rod (77). One end of another tie rod (76) is hinged to the middle of a connecting rod (74), and the other end is hinged to the lower end of the transmission rod (77).

2. The auxiliary forming device for a vacuum forming machine according to claim 1, characterized in that, When the upper mold (3) descends, the lower end face of the upper mold (3) fits against the upper end face of the lower mold (2), and the upper mold (3) seals the inner cavity of the lower mold (2).

3. The auxiliary forming device for a vacuum forming machine according to claim 2, characterized in that, A vertically downward pressing cylinder (4) is fixed on the inner top surface of the upper mold (3), and the template (41) is horizontally fixed at the end of the piston rod of the pressing cylinder (4). There is a gap between the edge of the template (41) and the inner wall of the upper mold (3).

4. The auxiliary forming device for a vacuum forming machine according to claim 1, 2, or 3, characterized in that, The upper mold (3) is rectangular, the template (41) is rectangular, and the template (41) is located at the center of the upper mold (3) in the horizontal direction.

5. The auxiliary forming device for a vacuum forming machine according to claim 4, characterized in that, The template (41) includes a horizontally arranged plate (411) and a core (412) fixed on the lower side of the plate (411) and protruding downward. When the template (41) descends, the core (412) can extend into the lower mold (2).

6. The auxiliary forming device for a vacuum forming machine according to claim 4, characterized in that, There are two air holes (31) symmetrically opened on the top surface of the upper mold (3). Both air holes (31) are located above the template (41) and opposite to the upper side of the template (41).

7. The auxiliary forming device for a vacuum forming machine according to claim 1, 2, or 3, characterized in that, The lifting plate (5) has several through holes. Several guide rods (33) are vertically fixed on the top surface of the upper mold (3). The guide rods (33) pass through the several through holes upwards respectively, and a limit nut (34) is screwed on the upper end of the guide rod (33). A buffer spring (35) is sleeved on each guide rod (33). The buffer spring (35) is tensioned between the upper mold (3) and the lifting plate (5).

8. The auxiliary forming device for a vacuum forming machine according to claim 7, characterized in that, The lower end of the transmission rod (77) has a strip hole (771) along its length direction, and the other pull rod (76) is hinged to the transmission rod (77) through the strip hole (771) by means of an adjusting bolt (772).

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