Positive and negative pressure film packaging machine

Abstract

The present invention relates to the technical field of electronic precision workpiece body packaging, and in particular to a positive and negative pressure film packaging machine, comprising a frame; an upper vacuum box and a lower vacuum box are provided on the frame, and a first pressure relief member is provided on the upper vacuum box; the lower vacuum box is located below the upper vacuum box, and a second pressure relief member is provided on the lower vacuum box; a heating component is provided in the upper vacuum box; a film pressing component is provided on the frame and is located between the upper vacuum box and the lower vacuum box; a mold plate is provided in the lower vacuum box, and a pressure hole is provided on the mold plate, and a third pressure relief member is provided at the bottom of the mold plate; a first driving component is connected to the frame, and the movable end of the first driving component is connected to the mold plate, and the first driving component drives the mold plate to move in a vertical direction so that the mold plate contacts the film pressing component. When the mold plate contacts the film pressing component, a closed working area is formed between the mold plate and the film pressing component. Film lamination is achieved by gas pressure, and thus film lamination packaging can also be achieved for non-air-permeable packaging materials.

Description

Technical Field

[0001] The invention relates to the technical field of electronic precision workpiece body packaging, in particular to a positive and negative pressure film packaging machine. Background Art

[0002] Skin packaging is to heat the transparent plastic film to soften it, then cover it on the product lined with cardboard, and draw a vacuum from the bottom. The heated and softened plastic film adheres to the surface of the product in the shape of the product, and also adheres to the cardboard that carries the product. After cooling and forming, it becomes a novel packaging object.

[0003] Skin packaging wraps the product with a completely transparent plastic film, so the packaged product can be neatly, firmly, transparently, beautifully, colorfully, and clearly displayed on the "shelf", making the product more attractive. If colorful patterns and words are printed on the cardboard of the skin packaging, it can increase the attractiveness of the product. The product is not only clear at a glance, but also has a good shape and feel.

[0004] The existing skin packaging equipment in the market can only perform skin vacuum coating packaging on workpieces whose packaging materials are breathable (i.e. have air holes). It is impossible to achieve complete skin vacuum coating packaging on packaging materials that are not breathable, and the turnover protection of precision electronic components cannot be achieved. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problems in the prior art, the present invention provides a positive and negative pressure film packaging machine.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a positive and negative pressure film packaging machine, including a frame; an upper vacuum box, which is arranged on the frame and can move in a vertical direction relative to the frame, and the upper vacuum box is provided with a first pressure relief part; a lower vacuum box, which is arranged on the frame and located below the upper vacuum box, and the lower vacuum box is provided with a second pressure relief part; a heating component, which is arranged in the upper vacuum box; a film pressing component, which is arranged on the frame and located between the upper vacuum box and the lower vacuum box; a mold tray, which is arranged in the lower vacuum box, and a third pressure relief part is provided at the bottom of the mold tray; a first driving component, which is connected to the frame, and the movable end of the first driving component is connected to the mold tray, and the first driving component drives the mold tray to move in a vertical direction so that the mold tray contacts the film pressing component, and when the mold tray contacts the film pressing component, a closed working area is formed between the mold tray and the film pressing component.

[0007] The positive and negative pressure film packaging machine of the present invention, when working, the film pressing component makes the film be located between the upper vacuum box and the lower vacuum box, and then when the upper vacuum box and the lower vacuum box are closed, the upper vacuum box and the lower vacuum box are evacuated, and after reaching the set vacuum degree, the movable end of the first driving component drives the mold plate to move to contact with the film pressing component, and forms a closed working area between the mold plate and the film pressing component, at this time, the upper vacuum box and the lower vacuum box are depressurized by the first pressure relief part and the second pressure relief part respectively, so that the interior of the upper vacuum box and the lower vacuum box gradually changes to positive pressure, thereby causing the gas in the upper vacuum box to apply pressure to the film, and the gas mold plate in the lower vacuum box applies pressure to the workpiece, and at the same time, because the heating component keeps heating the film, the film is in a softened state, thereby causing the film to be wrapped around the workpiece; film coating is achieved by gas pressure, and thus film coating packaging can also be achieved for non-air-permeable packaging materials.

[0008] Furthermore, a second driving assembly is disposed on the frame, a movable end of the second driving assembly is connected to the upper vacuum box, and the movable end of the second driving assembly moves in a vertical direction.

[0009] Furthermore, the heating assembly includes a heating frame and a heating tube, the heating frame is connected to the upper vacuum box, the heating tube is arranged in the heating frame, and the heating frame has an opening arranged toward the lower vacuum box.

[0010] Furthermore, the film pressing assembly includes a sealing cover plate, a pressure plate and a first telescopic member. The sealing cover plate is connected to the lower vacuum box, and a sealing groove is provided on the sealing cover plate; one end of the first telescopic member is hinged to the frame, and the other end is hinged to the middle part of the pressure plate, and the pressure plate is also hinged to the frame. The pressure plate has a loose state and a tightened state, and the first telescopic member drives the pressure plate to switch between the loose state and the tightened state; when the pressure plate is in the tightened state, the pressure plate is pressed on the top of the sealing cover plate; when the pressure plate is in the loose state, the pressure plate is separated from the sealing cover plate.

[0011] Furthermore, a loading rack is provided on the frame, a loading rod is provided on the loading rack, two limiting cones are sleeved on the loading rod, and the small ends of the two limiting cones are arranged opposite to each other.

[0012] Furthermore, the feeding rack is provided with a rotating bearing, and two groups of the rotating bearings are arranged along the axial direction of the feeding rod, and each group of the rotating bearings is provided with two. The feeding rod is provided with a limiting ring groove for inserting the rotating bearing, and the limiting ring grooves are provided with two and are arranged corresponding to the two groups of rotating bearings.

[0013] Furthermore, a fixed plate is provided on the frame, a limiting frame is connected to the fixed plate, a second telescopic member is connected to the limiting frame, and a movable end of the second telescopic member is connected to the limiting plate; when the movable end of the second telescopic member is retracted, a limiting gap is formed between the limiting plate and the fixed plate; when the movable end of the second telescopic member is extended, the limiting plate is pressed on the fixed plate.

[0014] Furthermore, the mold plate is provided with placement protrusions, and the placement protrusions are arranged in a plurality of groups along the length direction of the mold plate, and each group of the placement protrusions is arranged in a plurality along the width direction of the mold plate, and grooves are formed between adjacent placement protrusions.

[0015] Furthermore, a sealing strip is provided on the mold disc, and the sealing strip is arranged around the mold disc. A sealing ear is connected to the sealing strip, and an empty groove is formed between the sealing ear and the sealing strip. The sealing ear is used to contact the sealing cover plate.

[0016] Furthermore, a vacuum pump is provided on the frame, and the vacuum pump is connected to both the upper vacuum box and the lower vacuum box.

[0017] The beneficial effects of the present invention are:

[0018] 1. During operation, the film pressing assembly makes the film located between the upper vacuum box and the lower vacuum box. Then, when the upper vacuum box and the lower vacuum box are closed, the upper vacuum box and the lower vacuum box are evacuated. After reaching the set vacuum degree, the movable end of the first driving assembly drives the die plate to move to contact with the film pressing assembly, and forms a closed working area between the die plate and the film pressing assembly. At this time, the upper vacuum box and the lower vacuum box are depressurized through the first pressure relief member and the second pressure relief member respectively, so that the internal pressure of the upper vacuum box and the lower vacuum box gradually changes to positive pressure, so that the gas in the upper vacuum box exerts pressure on the film, and the gas in the lower vacuum box exerts pressure on the workpiece through the die plate. At the same time, because the heating assembly keeps heating the film, the film is in a softened state, so that the film is wrapped around the workpiece; the film is coated by gas pressure, so that the non-air-permeable packaging material can also be coated and packaged;

[0019] 2. The groove is provided so that when the third pressure relief member releases pressure, gas can flow through the groove, thereby facilitating pressure relief;

[0020] 3. Through the arrangement of the sealing strip, the sealing ear and the vacant groove, the vacant groove enables the sealing ear to better fit with the sealing cover plate to improve the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the positive and negative pressure film packaging machine in the present invention.

[0023] Figure 2 It is a schematic diagram of the second pressure relief member in the present invention.

[0024] Figure 3 It is a schematic cross-sectional view of a discharge plate in the present invention.

[0025] Figure 4 It is a schematic diagram of the first driving component in the present invention.

[0026] Figure 5 It is a schematic diagram of a heating component in the present invention.

[0027] Figure 6 yes Figure 3 A partial enlarged view of part B in the middle.

[0028] Figure 7 yes Figure 1 A partial enlarged view of part A in the middle.

[0029] Figure 8 It is a schematic diagram of a pressing plate in the present invention.

[0030] Fig. 9 It is a schematic diagram showing the front side of the clamping tool in the present invention.

[0031] Fig.10 It is a schematic diagram showing the reverse side of the clamping tool in the present invention.

[0032] Fig.11 It is a schematic diagram of a loading and conveying platform in the present invention.

[0033] In the figure: 1, frame; 11, vacuum pump; 12, loading rack; 121, V-shaped groove; 122, rotating bearing; 13, loading rod; 131, limiting cone; 132, limiting ring groove; 14, fixing plate; 141, limiting rack; 142, second telescopic member; 143, limiting plate; 2, upper vacuum box; 21, first pressure relief member; 22, heating assembly; 221, heating frame; 222, heating tube; 23, second driving assembly; 3, lower vacuum box; 31, second pressure relief member; 32, first driving assembly; 321, lifting cylinder; 322, guide plate; 323, guide rod; 33, mold plate; 332, third pressure relief member Parts; 333, placement protrusion; 334, groove; 335, sealing strip; 3351, sealing ear; 3352, vacant slot; 4, film pressing assembly; 41, sealing cover plate; 411, sealing slot; 42, pressing plate; 421, hinged rod; 422, hinged plate; 43, first telescopic part; 5, feeding conveyor platform; 51, conveying slot; 52, conveyor belt; 53, feeding slot; 6, clamping tool; 61, first clamping plate; 611, second waist-shaped slot; 612, handle; 62, second clamping plate; 621, first waist-shaped slot; 622, sliding rod; 623, anti-slip rod; 634, support rod; 63, L-shaped clamping rod. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The invention discloses a positive and negative pressure film-sticking packaging machine.

[0037] Reference Figures 1 to 8 A positive and negative pressure film packaging machine includes a frame 1, on which an upper vacuum box 2, a lower vacuum box 3 and a film pressing assembly 4 are arranged. The upper vacuum box 2 can move in a vertical direction relative to the frame 1, and a first pressure relief member 21 is arranged on the upper vacuum box 2. The lower vacuum box 3 is located below the upper vacuum box 2, and a second pressure relief member 31 is arranged on the lower vacuum box 3. A heating assembly 22 is arranged in the upper vacuum box 2 to heat the film. The film pressing assembly 4 is located between the upper vacuum box 2 and the lower vacuum box 3 to limit the film. A mold tray 33 is arranged in the lower vacuum box 3 for placing workpieces, and a third pressure relief member 332 is arranged at the bottom of the mold tray 33. The frame 1 is fixedly connected with a first driving assembly 32 and a second driving assembly 23. The movable end of the first driving assembly 32 is fixed to the bottom of the mold plate 33. The first driving assembly 32 drives the mold plate 33 to move in the vertical direction so that the mold plate 33 contacts the film pressing assembly 4. When the mold plate 33 contacts the film pressing assembly 4, a closed working area is formed between the mold plate 33 and the film pressing assembly 4. The movable end of the second driving assembly 23 is fixedly connected to the upper vacuum box 2. The movable end of the second driving assembly 23 moves in the vertical direction so as to drive the upper vacuum box 2 to move toward the lower vacuum box 3.

[0038] Specifically, the first drive assembly 32 has the same structure as the second drive assembly 23, and the first drive assembly 32 is used as an example for description. The first drive assembly 32 includes a lifting cylinder 321, a guide plate 322, and a guide rod 323. The lifting cylinder 321 is fixedly connected to the frame 1, and the piston rod of the lifting cylinder 321 is fixedly connected to the bottom of the mold plate 33. The guide rod 323 is arranged through the guide plate 322, and one end of the guide rod 323 is fixedly connected to the guide plate 322. In this embodiment, four guide rods 323 are provided.

[0039] The heating assembly 22 includes a heating frame 221 and a heating tube 222. The heating frame 221 is fixedly connected to the upper vacuum box 2 and is located inside the upper vacuum box 2. The heating tube 222 is fixedly connected inside the heating frame 221, and there are multiple heating tubes 222 arrayed along the width direction of the heating frame 221 to achieve uniform heating. In order to better concentrate heat on the film below the heating frame 221, the heating frame 221 is provided with an opening facing the lower vacuum box 3.

[0040] Specifically, the film pressing assembly 4 includes a sealing cover plate 41, a pressing plate 42 and a first telescopic member 43. The sealing cover plate 41 is fixedly connected to the lower vacuum box 3, and a sealing groove 411 is provided on the sealing cover plate 41. One end of the first telescopic member 43 is hinged to the frame 1, and the other end is hinged to the middle of the pressing plate 42. The end of the pressing plate 42 is also fixedly connected to a hinged rod 421, and a hinged plate 422 is fixedly connected to the frame 1, and the hinged plate 422 is hinged to the hinged rod 421. The pressing plate 42 has a loose state and a clamped state, and the first telescopic member 43 drives the pressing plate 42 to switch between the loose state and the clamped state. When the pressing plate 42 is in the clamped state, the pressing plate 42 is pressed on the top of the sealing cover plate 41 to clamp the film. When the pressing plate 42 is in the loose state, the pressing plate 42 is separated from the sealing cover plate 41 so that the operator can place a new film.

[0041] It should be noted that a vacuum pump 11 is fixedly connected to the frame 1 , and the vacuum pump 11 is connected to both the upper vacuum box 2 and the lower vacuum box 3 so as to evacuate the upper vacuum box 2 and the lower vacuum box 3 .

[0042] The mold plate 33 is fixedly connected with placement protrusions 333, and there are multiple groups of placement protrusions 333 arrayed along the length direction of the mold plate 33. Each group of placement protrusions 333 is arrayed along the width direction of the mold plate 33, and a groove 334 is formed between adjacent placement protrusions 333. A sealing strip 335 is fixedly connected with the mold plate 33, and the sealing strip 335 is arranged around the mold plate 33. A sealing ear 3351 is connected to the sealing strip 335, and an empty groove 3352 is formed between the sealing ear 3351 and the sealing strip 335. The empty groove 3352 enables the sealing ear 3351 to better fit with the sealing cover plate 41 to improve the sealing performance.

[0043] The first pressure relief member 21, the second pressure relief member 31 and the third pressure relief member 332 can all adopt pressure relief valves. The second pressure relief valve is arranged on the side wall of the lower vacuum box 3. When the first driving component 32 drives the discharge plate to abut against the sealing cover plate 41, the second pressure relief member 31 is lower than the discharge plate to relieve pressure on the part of the lower vacuum box 3 located below the discharge plate.

[0044] The frame 1 is provided with a loading frame 12, and a loading rod 13 is provided on the loading frame 12. Two limiting cones 131 are sleeved on the loading rod 13, and the small ends of the two limiting cones 131 are arranged opposite to each other. The limiting cones 131 are made of rubber and have an interference fit with the loading rod 13 so as to limit the film rolled on the loading rod 13.

[0045] Specifically, the loading rack 12 is rotatably connected with a rotating bearing 122, and two groups of rotating bearings 122 are provided along the axial direction of the loading rod 13, and each group of rotating bearings 122 is provided with two. The side wall of the loading rod 13 is provided with a limiting ring groove 132 for inserting the rotating bearings 122, and two limiting ring grooves 132 are provided, and are correspondingly arranged with the two groups of rotating bearings 122. The loading rack 12 is also provided with a V-shaped groove 121 for placing the loading rod 13.

[0046] The frame 1 is fixedly connected with a fixed plate 14, the fixed plate 14 is fixedly connected with a limiting frame 141, the limiting frame 141 is fixedly connected with a second telescopic member 142, and the movable end of the second telescopic member 142 is fixedly connected with a limiting plate 143. When the movable end of the second telescopic member 142 is retracted, a limiting gap is formed between the limiting plate 143 and the fixed plate 14 to allow the film to pass through. When the movable end of the second telescopic member 142 is extended, the limiting plate 143 is pressed on the fixed plate 14 to fix the film.

[0047] It should be noted that the first telescopic member 43 and the second telescopic member 142 may be cylinders.

[0048] In addition, refer to Figures 9 to 11 Since multiple workpieces are placed on the mold plate 33 each time, in order to improve the workpiece placement efficiency, the workpieces are transported through the loading and conveying platform 5, and the loading is achieved through the clamping tooling 6.

[0049] Specifically, the clamping tool 6 includes a first clamping plate 61 and a second clamping plate 62, and an L-shaped clamping rod 63 is fixedly connected to the first clamping plate 61. The position and number of the L-shaped clamping rod 63 are set according to the workpiece to be placed as needed. In this embodiment, there can be five or nine L-shaped clamping rods 63. A first waist-shaped groove 621 is provided on the second clamping plate 62 along its width direction, and the first waist-shaped groove 621 is used for the L-shaped clamping rod 63 to pass through, and at the same time, it is convenient for the L-shaped clamping rod 63 to move along the width direction of the second clamping plate 62. Two second waist-shaped grooves 611 are provided on the first clamping plate 61 along the width direction of the second clamping plate 62, and two sliding rods 622 are fixedly connected to the second clamping plate 62, each sliding rod 622 slides in a second waist-shaped groove 611 respectively, and the same anti-slip rod 623 is inserted into the two sliding rods 622. A handle 612 is also fixedly connected to the first clamping plate 61 for easy gripping by the operator.

[0050] The feeding and conveying platform 5 is provided with a plurality of conveying grooves 51 along its length direction, and a conveyor belt 52 is installed in each conveying groove 51. The top surface of the conveyor belt 52 is not lower than the top surface of the feeding and conveying platform 5, and a part of each workpiece is located on the conveyor belt 52, and the other part is located above the feeding and conveying platform 5, so as to realize the conveyance of the workpiece. The feeding and conveying platform 5 is provided with a feeding groove 53, which is arranged on one side of the conveyor belt 52, and the number of the feeding grooves 53 is the same as that of the L-shaped clamping rods 63, and is used to place the L-shaped clamping rods 63. At least four support rods 634 are also fixedly connected to the end of the second clamping plate 62 away from the first clamping plate 61, so that when the second clamping plate 62 is placed on the feeding and conveying platform 5, there is a sufficient gap between the second clamping plate 62 and the feeding and conveying platform 5 for passing through. The end of the first clamping plate 61 away from the second clamping plate 62 is provided with a scale, so that when the workpiece is placed on the mold plate 33, it can be compared with the scale on the inner wall of the lower vacuum box 3 to quickly determine the position of the workpiece. The clamping fixture 6 can put all the workpieces in place at one time, and one loading workbench can correspond to multiple positive and negative pressure film packaging machines, with high loading efficiency.

[0051] Working principle: When working, the workpiece is loaded first. When loading, the operator places the clamping tool 6 on the loading workbench so that the support rod 634 contacts the loading workbench and the L-shaped clamping rod 63 is located in the placement groove. Then the conveyor belt 52 conveys the workpiece so that a part of the workpiece is located between the L-shaped clamping rod 63 and the second clamping plate 62. At this time, the conveyor belt 52 stops conveying. Then the operator holds the handle 612 and presses the anti-slip rod 623 so that the second clamping plate 62 cooperates with the L-shaped clamping rod 63 to clamp the workpiece. Then the clamping tool 6 is placed on the mold plate 33 so that the workpiece is located on the mold plate 33 and the L-shaped clamping rod 63 is located in the groove 334. At this time, the operator continues to press the anti-slip rod 623 and moves the first clamping plate 61 so that the L-shaped clamping rod 63 is separated from the workpiece. Then the operator holds the handle 612 to take out the clamping tool 6, and the loading of the workpiece is completed.

[0052] Then the operator pulls the film and places it on the sealing cover plate 41. At this time, the piston rod of the first telescopic member 43 extends, so that the pressure plate 42 is pressed on the film, and the second drive assembly 23 drives the upper vacuum box 2 to move, so that the upper vacuum box 2 abuts against the sealing cover plate 41, and the upper vacuum box 2 and the lower vacuum box 3 are closed. At this time, the upper vacuum box 2 and the lower vacuum box 3 are evacuated simultaneously by the vacuum pump 11. After reaching the set vacuum degree, the active end of the first drive assembly 32 drives the mold plate 33 to move to abut against the sealing cover plate 41, and a closed working area is formed between the mold plate 33 and the film. At this time, the upper vacuum box 2 and the lower vacuum box 3 are depressurized by the first pressure relief member 21 and the second pressure relief member 31 respectively, so that the internal pressure of the upper vacuum box 2 and the lower vacuum box 3 gradually changes to positive pressure, so that the gas in the upper vacuum box 2 applies pressure to the film, and the gas in the lower vacuum box 3 applies pressure to the workpiece through the mold plate 33. At the same time, because the heating assembly 22 keeps heating the film, the film is in a softened state, so that the film is wrapped on the workpiece.

[0053] After the coating is completed, the third pressure relief member 332 relieves the pressure on the working area above the mold plate 33, the second drive assembly 23 drives the upper vacuum box 2 to reset, and the first telescopic member 43 drives the pressing plate 42 to enter a loose state. At this time, the operator takes out the coated workpiece.

[0054] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A positive and negative pressure film packaging machine, characterized in that: include Rack (1); An upper vacuum box (2) is arranged on the frame (1) and is movable in a vertical direction relative to the frame (1); a first pressure relief member (21) is provided on the upper vacuum box (2); A lower vacuum box (3) is arranged on the frame (1) and is located below the upper vacuum box (2); a second pressure relief member (31) is provided on the lower vacuum box (3); A heating component (22) is arranged in the upper vacuum box (2); A film pressing assembly (4) is arranged on the frame (1) and is located between the upper vacuum box (2) and the lower vacuum box (3); A mold plate (33) is arranged in the lower vacuum box (3), and a third pressure relief member (332) is arranged at the bottom of the mold plate (33); A first driving component (32) is connected to the frame (1); a movable end of the first driving component (32) is connected to the die plate (33); the first driving component (32) drives the die plate (33) to move in a vertical direction so that the die plate (33) contacts the film pressing component (4); when the die plate (33) contacts the film pressing component (4), a closed working area is formed between the die plate (33) and the film pressing component (4); The mold plate (33) is provided with placement protrusions (333), and the placement protrusions (333) are arranged in a plurality of groups along the length direction of the mold plate (33), and each group of the placement protrusions (333) is arranged in a plurality of groups along the width direction of the mold plate (33), and grooves (334) are formed between adjacent placement protrusions (333); A plurality of workpieces are placed on the mold plate (33) at a time, and the workpieces are conveyed via the loading and conveying platform (5), while a plurality of products are simultaneously loaded via the clamping tool (6); The clamping tool (6) includes a first clamping plate (61) and a second clamping plate (62), the first clamping plate (61) is fixedly connected to an L-shaped clamping rod (63), the position and number of the L-shaped clamping rod (63) are set according to the workpiece to be placed, the second clamping plate (62) is provided with a first waist-shaped groove (621) along its width direction, the first waist-shaped groove (621) is used for the L-shaped clamping rod (63) to pass through, the first clamping plate (61) is provided with two second waist-shaped grooves (611) along the width direction of the second clamping plate (62), the second clamping plate (62) is fixedly connected to two sliding rods (622), each of the sliding rods (622) slides in a second waist-shaped groove (611) respectively, and the two sliding rods (622) are penetrated by the same anti-slip rod (623); The loading conveyor platform (5) is provided with a plurality of conveyor slots (51) along its length direction, and a conveyor belt (52) is installed in each of the conveyor slots (51). The top surface of the conveyor belt (52) is not lower than the top surface of the loading conveyor platform (5), and a part of each workpiece is located on the conveyor belt (52) and the other part is located above the loading conveyor platform (5); The loading and conveying platform (5) is provided with a loading trough (53), which is arranged on one side of the conveyor belt (52). The number of the loading troughs (53) is the same as the number of the L-shaped clamping rods (63), and the L-shaped clamping rods (63) are used to place the L-shaped clamping rods (63). The end of the second clamping plate (62) away from the first clamping plate (61) is also fixedly connected to at least four support rods (634), so that when the second clamping plate (62) is placed on the loading and conveying platform (5), there is a gap between the second clamping plate (62) and the loading and conveying platform (5) that is sufficient for the workpiece to pass through. The end of the first clamping plate (61) away from the second clamping plate (62) is provided with a scale, so that when the workpiece is placed on the mold plate (33), it can be compared with the scale provided on the inner wall of the lower vacuum box (3), thereby quickly determining the position of the workpiece.

2. The positive and negative pressure film packaging machine according to claim 1, characterized in that: The frame (1) is provided with a second driving assembly (23), the movable end of the second driving assembly (23) is connected to the upper vacuum box (2), and the movable end of the second driving assembly (23) moves in a vertical direction.

3. The positive and negative pressure film packaging machine according to claim 1, characterized in that: The heating assembly (22) comprises a heating frame (221) and a heating tube (222); the heating frame (221) is connected to the upper vacuum box (2); the heating tube (222) is arranged in the heating frame (221); and the heating frame (221) has an opening arranged toward the lower vacuum box (3).

4. The positive and negative pressure film packaging machine according to claim 3, characterized in that: The film pressing assembly (4) comprises a sealing cover plate (41), a pressing plate (42) and a first telescopic member (43); the sealing cover plate (41) is connected to the lower vacuum box (3); and a sealing groove (411) is provided on the sealing cover plate (41); One end of the first telescopic member (43) is hinged to the frame (1), and the other end is hinged to the middle of the pressing plate (42); the pressing plate (42) is also hinged to the frame (1); the pressing plate (42) has a loose state and a tight state; the first telescopic member (43) drives the pressing plate (42) to switch between the loose state and the tight state; When the pressing plate (42) is in a pressed state, the pressing plate (42) is pressed on the top of the sealing cover plate (41); When the pressing plate (42) is in a loosened state, the pressing plate (42) is separated from the sealing cover plate (41).

5. The positive and negative pressure film packaging machine according to claim 1, characterized in that: The frame (1) is provided with a loading frame (12), the loading frame (12) is provided with a loading rod (13), the loading rod (13) is sleeved with two limiting cones (131), and the small ends of the two limiting cones (131) are arranged opposite to each other.

6. The positive and negative pressure film packaging machine according to claim 5, characterized in that: The loading frame (12) is provided with a rotating bearing (122), and two groups of the rotating bearings (122) are provided along the axial direction of the loading rod (13), and each group of the rotating bearings (122) is provided with two. The loading rod (13) is provided with a limiting ring groove (132) for the rotating bearings (122) to be inserted, and the limiting ring grooves (132) are provided with two and are arranged corresponding to the two groups of rotating bearings (122).

7. The positive and negative pressure film packaging machine according to claim 5, characterized in that: The frame (1) is provided with a fixing plate (14), the fixing plate (14) is connected to a limiting frame (141), the limiting frame (141) is connected to a second telescopic member (142), and the movable end of the second telescopic member (142) is connected to the limiting plate (143); When the movable end of the second telescopic member (142) is retracted, a limited gap is formed between the limiting plate (143) and the fixed plate (14); When the movable end of the second telescopic member (142) is extended, the limiting plate (143) is pressed on the fixed plate (14).

8. The positive and negative pressure film packaging machine according to claim 7, characterized in that: The mold plate (33) is provided with a sealing strip (335), the sealing strip (335) is arranged around the mold plate (33), the sealing strip (335) is connected to a sealing ear (3351), an empty groove (3352) is formed between the sealing ear (3351) and the sealing strip (335), and the sealing ear (3351) is used to contact the sealing cover plate (41).

9. The positive and negative pressure film packaging machine according to claim 1, characterized in that: The frame (1) is provided with a vacuum pump (11), and the vacuum pump (11) is connected to both the upper vacuum box (2) and the lower vacuum box (3).

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