Plastic film thermoforming mechanism and production process

Abstract

The invention provides a plastic film heating forming mechanism and a production process, and relates to the technical field of plastic container forming, and the plastic film heating forming mechanism comprises a heating seat, a forming lower mold, a transfer upper mold, a driving part and a plurality of annular parts. According to the invention, the heating seat and the forming lower mold are separately designed, the two groups of transfer upper molds capable of exchanging positions are designed, and the transfer upper molds and the heating seat are matched to form a heating structure, so that a sheet-shaped plastic film with a preset size can be heated to a preset stability and then transferred to the forming lower mold from the transfer upper molds; the lower forming die and the upper transferring die can form the heated sheet-shaped plastic film with the preset size into a plurality of plastic containers, single plastic containers can be obtained through simple slitting in the later period, the heating and forming waiting time can be better utilized, and the production efficiency of the plastic containers is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic container molding, in particular to a plastic film heating molding mechanism and a production process. Background Art

[0002] Nowadays, people lead a fast pace of life and the demand for disposable plastic food containers has increased dramatically. The efficiency of plastic containers produced by traditional injection molding is low and cannot meet market demand. The use of plastic film for batch heating and molding can improve the production efficiency of plastic containers.

[0003] In the process of heating and forming plastic films, there are two main ways to heat the sheet plastic films cut into predetermined sizes. One is to heat them directly on a forming mechanism, and then perform pressurization (positive pressure / negative pressure) forming, and then cool and take out the materials. This process has a long heating waiting time. The other is to heat them on a heating mechanism and then transfer them to a forming mechanism. This method has a short waiting time, and heating and forming are basically completed simultaneously. However, there is a problem that the sheet plastic films are not easy to transfer after being heated and softened. For this reason, the present invention provides a plastic film heating and forming mechanism and a production process. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a plastic film heating and forming mechanism and a production process, which solves the problem that the sheet-shaped plastic film is difficult to transfer after being heated and softened during the heating and forming of the plastic film.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A plastic film heating and forming mechanism, comprising:

[0007] A heating seat, wherein the top of the heating seat has a first annular step opening;

[0008] A molding lower die, wherein the top of the molding lower die has a second annular step opening;

[0009] A transfer upper mold, wherein two groups of transfer upper molds are provided, and the two groups of transfer upper molds correspond to the heating seat and the molding lower mold respectively, and a clamping piece is provided on the side of the transfer upper mold, and an air hole is provided at the bottom of the cavity of the transfer upper mold;

[0010] A driving member, the action end of which is fixedly mounted on the two groups of transfer upper dies, and the driving member is used to exchange the positions of the two groups of transfer upper dies;

[0011] An annular member, wherein the annular member matches both the first annular step opening and the second annular step opening.

[0012] Preferably, it also includes:

[0013] A flattening component, wherein the flattening component is used to flatten the plastic film;

[0014] A shearing assembly, which is arranged on one side of the flattening assembly and is used to shear the flattened plastic film;

[0015] A power roller, which is arranged between the shearing assembly and the flattening assembly and is used to drive the plastic film;

[0016] The heating seat is located at one side of the shearing component.

[0017] Preferably, the flattening assembly comprises:

[0018] A support platform, wherein four groups of rectangularly distributed support columns are fixedly installed on the top of the support platform, and first vertical sliding holes are opened on the sides of the support columns;

[0019] An upper pressing plate and a lower pressing plate, wherein the upper pressing plate and the lower pressing plate are both arranged on the inner side of the four groups of support columns, and the bottom of the upper pressing plate corresponds to the top of the lower pressing plate, and the sides of the upper pressing plate and the lower pressing plate are both fixedly connected with rods corresponding to the first vertical sliding holes;

[0020] A dome frame, wherein the dome frame is fixedly mounted on the top ends of the four groups of support columns, and a suspended top piece is slidably connected to the center of the dome frame along the up-down direction, the bottom end of the suspended top piece is fixedly connected to the top of the upper pressure plate, and a spring piece is arranged between the top end of the suspended top piece and the top of the dome frame;

[0021] A sliding card, wherein two groups of sliding card are provided, and the two groups of sliding card are slidably installed on a group of symmetrical sides of the support platform, and an arch frame is fixedly connected between the two groups of sliding card, a horizontal telescopic member is fixedly installed on the bottom of the support platform, and the telescopic end of the horizontal telescopic member is fixedly installed on the arch frame, and a vertical driving plate is fixedly installed on the top of the sliding card, and the top and bottom ends of the vertical driving plate are fixedly installed with cross bars, and the sides of the upper pressure plate and the lower pressure plate are fixedly connected with arch members, and the cross bars correspond to the arched parts of the arch members.

[0022] Preferably, the shearing assembly comprises:

[0023] A first frame, wherein a second vertical sliding hole is formed on a side of the first frame;

[0024] An upper shearing piece and a lower shearing piece, wherein the upper shearing piece and the lower shearing piece are both slidably mounted on the inner side of the second vertical sliding hole, and the bottom of the upper shearing piece corresponds to the top of the lower shearing piece;

[0025] An elastic block is arranged between the upper shearing piece and the lower shearing piece;

[0026] The ends of the upper shearing piece and the lower shearing piece are fixedly connected with matching rods, and the side of the vertical driving plate is fixedly installed with a transverse driving plate, and the end of the transverse driving plate has a contraction opening. When the contraction opening horizontally squeezes the matching rods at the ends of the upper shearing piece and the lower shearing piece, the upper shearing piece and the lower shearing piece are sheared;

[0027] The bottom of the lower shearing piece is fixedly connected with an elastic frame.

[0028] Preferably, a guide frame is provided between the shearing assembly and the heating seat.

[0029] Preferably, the heating seat comprises: a base, a heating plate is fixedly mounted on the top of the base, and a first annular step opening is formed on the outer side of the heating plate and on the top of the base.

[0030] Preferably, the molding lower mold comprises:

[0031] A water tank, wherein circulating cooling water is arranged inside the water tank;

[0032] The model shell is fixedly installed inside the water tank, a plurality of molding cavities are opened on the top of the model shell, and a second annular step opening is opened on the outer side of the top of the model shell.

[0033] Preferably, the transfer upper mold comprises:

[0034] A cavity, wherein an air inlet interface and an air outlet interface are arranged at the top of the cavity, and a second frame is fixedly mounted on the side of the top of the cavity;

[0035] The clamping member comprises a bidirectional telescopic member, the main body of the bidirectional telescopic member is fixedly mounted on the top of the cavity, and clamping plates are fixedly mounted on both telescopic ends of the bidirectional telescopic member.

[0036] Preferably, the driving member comprises:

[0037] A frame, a rotating part is fixedly installed on the inner bottom of the frame, a beam is fixedly installed on the output end of the rotating part, vertical telescopic parts are fixedly installed on both ends of the beam, two groups of vertical telescopic parts correspond to two groups of transfer upper molds, and the vertical telescopic parts are fixedly connected to the second frame of the transfer upper mold.

[0038] A production process of a plastic film heating and forming mechanism, using the above-mentioned plastic film heating and forming mechanism, comprises the following steps:

[0039] S1, first buckle the annular member at the first annular step of the heating seat, then place a sheet of plastic film of a predetermined size on the heating seat, and operate one of the transfer upper molds of the driving member to press on the heating seat, and the heating seat heats the sheet of plastic film of the predetermined size;

[0040] S2, after the heating is completed, controlling the clamping member of the transfer upper mold located above the heating seat to clamp the annular member, so that a sealed space is formed between the bottom of the transfer upper mold located above the heating seat and the sheet-like plastic film of a predetermined size, and extracting the gas inside the cavity of the transfer upper mold located above the heating seat, so that a negative pressure is formed inside the cavity of the transfer upper mold located above the heating seat, and then a negative pressure is formed in the sealed space;

[0041] S23, the driving member controls the transfer upper mold located above the heating seat to carry the heated sheet plastic film of predetermined size to the molding lower mold, and then fills the cavity of the transfer upper mold at the molding lower mold with high-pressure gas to mold the heated sheet plastic film of predetermined size.

[0042] The present invention provides a plastic film heating and forming mechanism and production process, which has the following beneficial effects:

[0043] 1. The present invention separately designs a heating seat and a molding lower mold, and designs two groups of transfer upper molds that can exchange positions. The transfer upper mold cooperates with the heating seat to form a heating structure, which can heat a sheet of plastic film of a predetermined size to a predetermined stability, and then transfer it to the molding lower mold by the transfer upper mold. The molding lower mold and the transfer upper mold can form the heated sheet of plastic film of a predetermined size into a plurality of plastic containers, and a single plastic container can be obtained by simple cutting in the later stage. This method can make good use of the waiting time for heating and molding, and improve the production efficiency of plastic containers. In addition, the present invention also has a first annular step opening on the top of the heating seat, a second annular step opening on the top of the molding lower mold, and a clamping member on the side of the transfer upper mold, which is used in conjunction with the annular member for auxiliary production, so that when transferring the sheet of plastic film of a predetermined size after heat softening, the sheet of plastic film of a predetermined size after heat softening can be stably fixed, and negative pressure can be formed in the transfer upper mold to further stabilize the sheet of plastic film of a predetermined size after heat softening.

[0044] 2. The present invention, by designing structures such as a flattening component, a shearing component, and a power roller, can first flatten the plastic material rolled up on the drum and then cut it into sheet-like plastic films of a predetermined size, which can be automatically and efficiently produced, further improving the production efficiency of plastic containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A three-dimensional diagram of a plastic film heating and forming mechanism proposed by the present invention;

[0046] Figure 2 A front view of a plastic film heating and forming mechanism proposed by the present invention;

[0047] Figure 3 A top view of a plastic film heating and forming mechanism proposed by the present invention;

[0048] Figure 4 A side view of a plastic film heating and forming mechanism proposed by the present invention;

[0049] Figure 5 for Figure 3 Section view of the section line at AA;

[0050] Figure 6 A three-dimensional diagram of a partial structure of a plastic film heating and forming mechanism proposed by the present invention;

[0051] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0052] Figure 8 A three-dimensional diagram of a transfer upper mold of a plastic film heating and forming mechanism proposed by the present invention;

[0053] Fig. 9 A three-dimensional diagram of a flattening and shearing assembly of a plastic film heating and forming mechanism proposed by the present invention;

[0054] Fig.10 A three-dimensional diagram of a flattening and shearing assembly of a plastic film heating and forming mechanism proposed by the present invention;

[0055] Fig.11 A three-dimensional diagram of a flattening component of a plastic film heating and forming mechanism proposed by the present invention;

[0056] Fig.12 This is an exploded view of an upper pressing plate of a plastic film heating and forming mechanism proposed by the present invention.

[0057] Among them, 1. plastic film; 2. flattening component; 201. support platform; 202. support column; 203. dome frame; 204. upper pressure plate; 204a. plate body; 204b. shell; 204c. heating tube; 205. lower pressure plate; 206. suspended top member; 207. spring member; 208. horizontal telescopic member; 209. sliding card; 2010. vertical drive plate; 2011. cross bar; 2012. arch member; 2013. horizontal drive plate; 2014. bow frame; 3. shearing component; 301. first frame; 302. upper shear member; 303. lower shear member; 30 3a, elastic frame; 304, elastic block; 4, power roller; 5, heating seat; 501, base; 502, heating plate; 6, molding lower mold; 601, water tank; 602, model shell; 603, molding cavity; 7, transfer upper mold; 701, cavity; 701a, air hole; 702, clamping part; 702a, clamping plate; 702b, two-way telescopic part; 703, second frame; 704, air inlet interface; 705, air outlet interface; 8, guide frame; 9, driving part; 901, frame; 902, rotating part; 903, beam frame; 904, vertical telescopic part; a, ring part. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Embodiment 1:

[0060] like Figure 1-Figure 12 As shown, an embodiment of the present invention provides a plastic film heating and forming mechanism, comprising: a heating seat 5, a forming lower mold 6, a transfer upper mold 7, a driving member 9 and a plurality of annular members a.

[0061] The annular part a is an auxiliary part independent of the plastic film heating and forming mechanism.

[0062] The top of the heating seat 5 has a first annular step opening, and the annular member a can be sleeved at the first annular step opening. The top of the molding lower mold 6 has a second annular step opening, and the annular member a can also be sleeved at the second annular step opening. Two groups of transfer upper molds 7 are provided, and the two groups of transfer upper molds 7 correspond to the heating seat 5 and the molding lower mold 6 respectively, wherein the transfer upper mold 7 and the heating seat 5 can constitute a heating structure, and the transfer upper mold 7 and the molding lower mold 6 can constitute a molding structure. A clamping member 702 is provided on the side of the transfer upper mold 7, and an air hole 701a is provided at the bottom of the cavity 701 of the transfer upper mold 7. The action end of the driving member 9 is fixedly installed with the two groups of transfer upper molds 7. The driving member 9 is used to exchange the positions of the two groups of transfer upper molds 7. The annular member a matches the first annular step opening and the second annular step opening.

[0063] When in use, one group of transfer upper molds 7 and the heating seat 5 form a heating structure to heat the plastic film, and the other group of transfer upper molds 7 and the molding lower mold 6 form a molding structure to mold the heated plastic film. When the positions of the two groups of transfer upper molds 7 are exchanged, one group of transfer upper molds 7 transfers the molded product and moves it to the top of the heating seat 5 to prepare to form a heating structure with the heating seat 5, and the other group of transfer upper molds 7 carries the heated plastic film to the molding lower mold 6, and forms a molding structure with the molding lower mold 6 to mold the heated plastic film. Such a cycle can realize efficient production of plastic containers.

[0064] In the process of transferring the upper mold 7 carrying the heated plastic film to the molding lower mold 6, the clamping part 702 can clamp the annular part a under the plastic film, and the annular part a and the bottom of the transfer upper mold 7 squeeze the edge of the heated plastic film, and draw a negative pressure into the cavity 701 of the transfer upper mold 7. At this time, the heated plastic film can be stably connected to the transfer upper mold 7, thereby solving the problem that the sheet plastic film is difficult to transfer after heating and softening.

[0065] In one embodiment, it also includes: a flattening component 2, a shearing component 3 and a power roller 4.

[0066] The flattening component 2 is used to flatten the plastic film 1. The shearing component 3 is arranged on one side of the flattening component 2 and is used to shear the flattened plastic film 1. The power roller 4 is arranged between the shearing component 3 and the flattening component 2 and is used to drive the plastic film 1.

[0067] The power roller 4 generally adopts a double-roller structure, and the double rollers are directly driven to rotate by a motor, so that the plastic film 1 can move forward. Since the plastic film 1 is wound around the roller, the plastic film 1 is relatively bent when it is untied from the roller. When passing through the flattening component 2, the flattening component 2 flattens the plastic film 1. The flattened plastic film 1 passes through the shearing component 3. The shearing component 3 can cut the flattened plastic film 1 into sheets of predetermined size according to a predetermined length. The heating seat 5 is located on one side of the shearing component 3. A guide frame 8 is also provided between the shearing component 3 and the heating seat 5. The cut sheet of predetermined size of the plastic film falls along the guide frame 8 onto the heating seat 5, realizing automatic loading on the heating seat 5, thereby improving production efficiency and reducing labor costs.

[0068] In one embodiment, the flattening assembly 2 includes: a support platform 201, an upper pressing plate 204, a lower pressing plate 205, a dome frame 203, a sliding clamp 209, etc.

[0069] Four groups of rectangular support columns 202 are fixedly installed on the top of the support platform 201, and a first vertical sliding hole is opened on the side of the support column 202. The upper pressing plate 204 and the lower pressing plate 205 are both arranged on the inner side of the four groups of support columns 202, and the bottom of the upper pressing plate 204 corresponds to the top of the lower pressing plate 205. The upper pressing plate 204 and the lower pressing plate 205 can flatten the plastic film passing therebetween, and the sides of the upper pressing plate 204 and the lower pressing plate 205 are fixedly connected with rods corresponding to the first vertical sliding holes, and the rods slide up and down in the first vertical sliding holes, thereby guiding the movement of the upper pressing plate 204 and the lower pressing plate 205. The dome frame 203 is fixedly installed on the top of the four groups of support columns 202, and the four groups of support columns 202 are composed of two groups of arch frames. The center of the dome frame 203 is slidably connected with a suspended top piece 206 along the up and down direction, and the bottom end of the suspended top piece 206 is connected to the upper pressing plate 204 The top of the dome frame 203 is fixedly connected, a spring member 207 is arranged between the top of the suspended top member 206 and the top of the dome frame 203, under the action of the spring member 207 and the suspended top member 206, the elastic suspension of the upper pressure plate 204 is realized, two groups of sliding clamps 209 are arranged, the two groups of sliding clamps 209 are slidably installed on a group of symmetrical sides of the support platform 201, and an arch frame 2014 is fixedly connected between the two groups of sliding clamps 209, a horizontal telescopic member 208 is fixedly installed at the bottom of the support platform 201, and the telescopic end of the horizontal telescopic member 208 is fixedly installed with the arch frame 2014, a vertical driving plate 2010 is fixedly installed on the top of the sliding clamp 209, and a cross bar 2011 is fixedly installed on the top and bottom of the vertical driving plate 2010, and the sides of the upper pressure plate 204 and the lower pressure plate 205 are fixedly connected with arch members 2012, and the cross bar 2011 corresponds to the arched part of the arch member 2012.

[0070] When working, the horizontal telescopic member 208 pushes the bow frame 2014 to move horizontally, and then pushes the sliding card 209 to slide along the side of the support platform 201, and the sliding card 209 drives the vertical driving plate 2010 to slide horizontally, and the cross bar 2011 squeezes the arched part of the arch member 2012, so that the upper pressure plate 204 and the lower pressure plate 205 are squeezed toward the middle (the upper pressure plate 204 overcomes the elastic force of the elastic suspension and moves downward, and the lower pressure plate 205 overcomes gravity and moves upward), so as to flatten the plastic film.

[0071] The upper pressing plate 204 and the lower pressing plate 205 have the same structure and are symmetrically positioned up and down; the upper pressing plate 204 includes a shell 204b, a heating tube 204c is arranged inside the shell 204b, a plate body 204a is fixedly installed on the top of the shell 204b, the heating tube 204c heats the shell 204b, and when the shell 204b contacts the plastic film, the plastic film is softened and then flattened.

[0072] In one embodiment, the shearing assembly 3 includes: a first frame 301, an upper shearing piece 302, and a lower shearing piece 303. A second vertical sliding hole is opened on the side of the first frame 301. The upper shearing piece 302 and the lower shearing piece 303 are both slidably installed on the inner side of the second vertical sliding hole, and the bottom of the upper shearing piece 302 corresponds to the top of the lower shearing piece 303.

[0073] An elastic block 304 is arranged between the upper shearing piece 302 and the lower shearing piece 303, and the elastic block 304 separates the upper shearing piece 302 and the lower shearing piece 303. The ends of the upper shearing piece 302 and the lower shearing piece 303 are fixedly connected with matching rods. A horizontal driving plate 2013 is fixedly installed on the side of the vertical driving plate 2010. The end of the horizontal driving plate 2013 has a contraction opening. When the contraction opening horizontally squeezes the matching rods at the ends of the upper shearing piece 302 and the lower shearing piece 303, the upper shearing piece 302 and the lower shearing piece 303 perform a shearing action.

[0074] Specifically, the shrinkage opening is "V"-shaped. When the shrinkage opening squeezes the matching rods on the upper shearing piece 302 and the lower shearing piece 303, the upper shearing piece 302 and the lower shearing piece 303 overcome the elastic force of the elastic block 304, and the upper shearing piece 302 and the lower shearing piece 303 close to cut the plastic film.

[0075] The bottom of the lower shearing piece 303 is fixedly connected with an elastic frame 303a, and the elastic frame 303a is elastically supported at the bottom of the second vertical sliding hole to prevent the lower shearing piece 303 from colliding with the bottom of the second vertical sliding hole when falling.

[0076] In one embodiment, the heating seat 5 includes: a base 501, a heating plate 502 is fixedly installed on the top of the base 501, and a first annular step is formed on the outer side of the heating plate 502 and located on the top of the base 501. The top surface of the base 501 is larger than the bottom surface of the heating plate 502 to form the first annular step, and the heating plate 502 is an electric heating plate.

[0077] In one embodiment, the lower molding die 6 includes: a water tank 601 and a model shell 602 .

[0078] The inside of the water tank 601 is provided with circulating cooling water, that is, the inside of the water tank 601 is filled with water, and water inlet and outlet pipes are provided, so that the water inside the water tank 601 can be replaced in time. The model shell 602 is fixedly installed inside the water tank 601, and a plurality of molding cavities 603 are opened on the top of the model shell 602, and a second annular step opening is opened on the outer side of the top of the model shell 602.

[0079] Since the model shell 602 is fixedly installed inside the water tank 601, the temperature of the model shell 602 is relatively low, and the plastic container can be quickly cooled after being formed.

[0080] In one embodiment, the transfer upper mold 7 includes: a cavity 701, an air inlet interface 704 and an air outlet interface 705 are arranged on the top of the cavity 701, and a pump body and a pipeline are installed corresponding to the air inlet interface 704 and the air outlet interface 705. When the pump body is working, high-pressure gas can be filled into the cavity 701 from the air inlet interface 704. When the other pump body is working, air can be drawn from the air outlet interface 705 to form a negative pressure inside the cavity 701. A second frame 703 is fixedly installed on the top side of the cavity 701.

[0081] The clamping member 702 includes a bidirectional telescopic member 702b, the main body of the bidirectional telescopic member 702b is fixedly installed on the top of the cavity 701, and clamping plates 702a are fixedly installed on both telescopic ends of the bidirectional telescopic member 702b.

[0082] The bidirectional telescopic member 702b drives the two clamping plates 702a to move inward, and the two clamping plates 702a can clamp the annular member a.

[0083] In one embodiment, the driving member 9 includes: a frame 901, a rotating member 902 is fixedly installed on the inner bottom of the frame 901, a beam frame 903 is fixedly installed on the output end of the rotating member 902, and vertical telescopic members 904 are fixedly installed on both ends of the beam frame 903. Two groups of vertical telescopic members 904 correspond to two groups of transfer upper molds 7, and the vertical telescopic members 904 are fixedly connected to the second frame body 703 of the transfer upper mold 7.

[0084] The two vertical telescopic members 904 can independently telescope in the up and down directions, and the rotating member 902 can drive the beam frame 903 to rotate. Through the cooperation of the above two vertical telescopic members 904 and the rotating member 902, the position exchange of the two sets of transfer upper molds 7 can be achieved.

[0085] Embodiment 2:

[0086] A production process of a plastic film heating and forming mechanism, using the plastic film heating and forming mechanism in the first embodiment, comprises the following steps:

[0087] S1. First, buckle the annular member at the first annular step of the heating seat, and then place a sheet of plastic film of a predetermined size on the heating seat. The driving member operates one of the transfer upper molds to press on the heating seat. The heating seat heats the sheet of plastic film of the predetermined size. The other transfer upper mold is cooperating with the molding lower mold to complete the molding of the plastic film. Heating and molding can be carried out simultaneously.

[0088] S2. After the heating is completed, the clamping member of the transfer upper mold located above the heating seat is controlled to clamp the annular member, so that a sealed space is formed between the bottom of the transfer upper mold located above the heating seat and the sheet-like plastic film of a predetermined size, and the gas inside the cavity of the transfer upper mold located above the heating seat is extracted to form a negative pressure inside the cavity of the transfer upper mold located above the heating seat, thereby forming a negative pressure in the sealed space.

[0089] S23, the driving member controls the transfer upper mold located above the heating seat to carry the heated sheet plastic film of predetermined size to the molding lower mold, and then fills the cavity of the transfer upper mold at the molding lower mold with high-pressure gas to mold the heated sheet plastic film of predetermined size.

[0090] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic film heating and forming mechanism, characterized in that: include: A heating seat (5), wherein the top of the heating seat (5) has a first annular step opening; A lower molding die (6), wherein the top of the lower molding die (6) has a second annular step opening; A transfer upper mold (7), wherein two groups of the transfer upper mold (7) are provided, and the two groups of the transfer upper mold (7) correspond to the heating seat (5) and the molding lower mold (6) respectively, and a clamping piece (702) is provided on the side of the transfer upper mold (7), and an air hole (701a) is provided at the bottom of the cavity (701) of the transfer upper mold (7); A driving member (9), the action end of which is fixedly mounted on the two groups of transfer upper dies (7), and the driving member (9) is used to exchange the positions of the two groups of transfer upper dies (7); An annular component (a), wherein the annular component (a) matches both the first annular step opening and the second annular step opening.

2. A plastic film heating and forming mechanism according to claim 1, characterized in that , also includes: A flattening component (2), wherein the flattening component (2) is used to flatten the plastic film (1); A shearing component (3), the shearing component (3) being arranged on one side of the flattening component (2) and being used for shearing the flattened plastic film (1); A power roller (4), the power roller (4) being arranged between the shearing component (3) and the flattening component (2), the power roller (4) being used to drive the plastic film (1); The heating seat (5) is located on one side of the shearing component (3).

3. A plastic film heating and forming mechanism according to claim 2, characterized in that: The flattening assembly (2) comprises: A support platform (201), wherein four groups of support columns (202) distributed in a rectangular shape are fixedly mounted on the top of the support platform (201), and first vertical sliding holes are opened on the sides of the support columns (202); An upper pressing plate (204) and a lower pressing plate (205), wherein the upper pressing plate (204) and the lower pressing plate (205) are both arranged on the inner side of the four groups of support columns (202), and the bottom of the upper pressing plate (204) corresponds to the top of the lower pressing plate (205), and the sides of the upper pressing plate (204) and the lower pressing plate (205) are both fixedly connected with a rod corresponding to the first vertical sliding hole; A dome frame (203), wherein the dome frame (203) is fixedly mounted on the top ends of the four groups of support columns (202), and a suspension member (206) is slidably connected to the center of the dome frame (203) along the up-down direction, the bottom end of the suspension member (206) is fixedly connected to the top of the upper pressure plate (204), and a spring member (207) is provided between the top end of the suspension member (206) and the top of the dome frame (203); A sliding card (209), wherein two groups of the sliding card (209) are provided, and the two groups of the sliding card (209) are slidably mounted on a group of symmetrical side surfaces of the support platform (201), and an arch frame (2014) is fixedly connected between the two groups of the sliding card (209), and a horizontal telescopic member (208) is fixedly mounted on the bottom of the support platform (201), and the telescopic end of the horizontal telescopic member (208) is fixedly mounted on the arch frame (2014), and a vertical driving plate (2010) is fixedly mounted on the top of the sliding card (209), and a cross bar (2011) is fixedly mounted on the top and bottom ends of the vertical driving plate (2010), and the sides of the upper pressing plate (204) and the lower pressing plate (205) are fixedly connected with an arch member (2012), and the cross bar (2011) corresponds to the arch portion of the arch member (2012).

4. A plastic film heating and forming mechanism according to claim 3, characterized in that: The shearing assembly (3) comprises: A first frame (301), wherein a second vertical sliding hole is formed on a side surface of the first frame (301); An upper shearing piece (302) and a lower shearing piece (303), wherein the upper shearing piece (302) and the lower shearing piece (303) are both slidably mounted on the inner side of the second vertical sliding hole, and the bottom of the upper shearing piece (302) corresponds to the top of the lower shearing piece (303); An elastic block (304) is provided between the upper shearing piece (302) and the lower shearing piece (303); The ends of the upper shearing piece (302) and the lower shearing piece (303) are fixedly connected with matching rods, and the side of the vertical driving plate (2010) is fixedly installed with a transverse driving plate (2013), and the end of the transverse driving plate (2013) has a contraction opening, and when the contraction opening horizontally squeezes the matching rods at the ends of the upper shearing piece (302) and the lower shearing piece (303), the upper shearing piece (302) and the lower shearing piece (303) perform a shearing action; The bottom of the lower shearing piece (303) is fixedly connected with an elastic frame (303a).

5. A plastic film heating and forming mechanism according to claim 2, characterized in that: A guide frame (8) is provided between the shearing assembly (3) and the heating seat (5).

6. A plastic film heating and forming mechanism according to claim 1, characterized in that: The heating seat (5) comprises: a base (501), a heating plate (502) is fixedly mounted on the top of the base (501), and a first annular step opening is formed on the outside of the heating plate (502) and located on the top of the base (501).

7. A plastic film heating and forming mechanism according to claim 1, characterized in that: The lower molding die (6) comprises: A water tank (601), wherein circulating cooling water is arranged inside the water tank (601); A model shell (602) is fixedly installed inside the water tank (601), a plurality of molding cavities (603) are opened on the top of the model shell (602), and a second annular step opening is opened on the outer side of the top of the model shell (602).

8. A plastic film heating and forming mechanism according to claim 1, characterized in that: The transfer upper mold (7) comprises: A cavity (701), wherein the top of the cavity (701) is provided with an air inlet interface (704) and an air outlet interface (705), and a second frame (703) is fixedly mounted on the top side of the cavity (701); The clamping member (702) comprises a bidirectional telescopic member (702b), the main body of the bidirectional telescopic member (702b) being fixedly mounted on the top of the cavity (701), and clamping plates (702a) being fixedly mounted on both telescopic ends of the bidirectional telescopic member (702b).

9. A plastic film heating and forming mechanism according to claim 8, characterized in that: The driving member (9) comprises: A frame (901) is provided, wherein a rotating member (902) is fixedly installed at the inner bottom of the frame (901), a beam frame (903) is fixedly installed at the output end of the rotating member (902), vertical telescopic members (904) are fixedly installed at both ends of the beam frame (903), two groups of vertical telescopic members (904) correspond to two groups of transfer upper molds (7), and the vertical telescopic members (904) are fixedly connected to the second frame body (703) of the transfer upper mold (7).

10. A production process for a plastic film heating and forming mechanism, characterized in that: Using the plastic film heating and forming mechanism according to any one of claims 1 to 9 comprises the following steps: S1, first buckle the annular member at the first annular step of the heating seat, then place a sheet of plastic film of a predetermined size on the heating seat, and operate one of the transfer upper molds of the driving member to press on the heating seat, and the heating seat heats the sheet of plastic film of the predetermined size; S2, after the heating is completed, controlling the clamping member of the transfer upper mold above the heating seat to clamp the annular member, so that a sealed space is formed between the bottom of the transfer upper mold above the heating seat and the sheet-like plastic film of a predetermined size, and extracting the gas inside the cavity of the transfer upper mold above the heating seat, so that a negative pressure is formed inside the cavity of the transfer upper mold above the heating seat, and then a negative pressure is formed in the sealed space; S23, the driving member controls the transfer upper mold located above the heating seat to carry the heated sheet plastic film of predetermined size to the molding lower mold, and then fills the cavity of the transfer upper mold at the molding lower mold with high-pressure gas to mold the heated sheet plastic film of predetermined size.

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