Usage method of a stretching and forming packaging machine for a flexible high-barrier composite film

Abstract

The present invention discloses a method for using a composite film stretching and forming packaging machine, including: a working base table, on the top of which a collaborative encapsulation mechanism, a film stretching mechanism and a smoothing mechanism are respectively fixedly installed. The collaborative encapsulation mechanism includes a load-bearing sleeve, and the load-bearing sleeve is fixedly inserted on the top of the working base table. The outer wall of the working base table is fixedly installed with a reinforcing plate A through a set of screws, and a U-shaped frame is welded on the outer wall of the reinforcing plate A. At this time, a cutting tool is used to cut the composite film covering the lower part of the box body to make it separate from the whole composite film, and then a retraction component is used to fold and regularize the composite film extending from the bottom of the box body so that it adheres to the bottom of the box body. Finally, a heating component is used to seal the composite film at the bottom of the box body.

Description

Technical Field

[0001] The present invention relates to the technical field of composite film packaging equipment, and particularly relates to a flexible high-barrier composite film stretching and forming packaging machine and a using method thereof. Background Art

[0002] The materials of the composite film include any possible combination of materials, such as a ceramic film coated on a metal oxide or an aromatic polyamide film coated on a polysulfone microporous membrane. Its flat film or spiral wound membrane needs to be reinforced with non-woven fabric to support the pressure resistance of the microporous membrane, while the hollow fiber membrane does not need to be. The composite film is attached with geotextile on one or both sides of the film to form a composite geomembrane. Its forms include one-layer fabric and one-layer film, two-layer fabric and one-layer film, with a width of 4 - 6m and a weight of 200 - 1500g per square meter. It has high physical and mechanical property indexes such as tensile strength, tear resistance, and puncture resistance. The product has the characteristics of high strength, good elongation performance, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance, and good anti-seepage performance, and can meet the needs of civil engineering such as anti-seepage, isolation, reinforcement, and crack prevention and reinforcement in water conservancy, municipal, construction, transportation, subway, tunnel, and engineering construction. Since it selects polymer materials and anti-aging agents are added in the production process, it can be used in unconventional temperature environments and is commonly used for anti-seepage treatment of dams and drainage ditches, as well as anti-pollution treatment of waste yards.

[0003] The composite film has the characteristics of high strength, tensile strength, and tear resistance. In particular, the composite film can block the entry of air, and thus the composite film can be applied to multiple fields. When the composite film is used for food packaging, since most food needs to be stored in a sealed and dry environment after production, using the characteristics of the composite film, it can fully block the external air and prevent the moisture in the air from penetrating into the food packaging box.

[0004] However, the existing composite film packaging machines have the following deficiencies:

[0005] Most of the food packaging boxes are square. When packaging the boxes, the entire surface of the box body needs to be fully covered. However, due to the relatively simple internal structure of the existing packaging machines, most of them cover the composite film on the surface of the box body by winding, and cannot accurately cut the required area of the composite film and quickly seal the intersection of the composite film.

[0006] Therefore, we propose a flexible high-barrier composite film stretching and forming packaging machine and a using method thereof to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of the present invention is to provide a stretching and forming packaging machine for a flexible high-barrier composite film and its usage method. Through a collaborative encapsulation mechanism connected to the working base, using the pressing effect generated by specified components, the area of the composite film is stretched to evenly cover the outer surface of the packaging box. When the composite film is stretched to the moving length, a cutter is used to cut the ground to separate it from the box body, and then the composite film at the bottom of the box body is softened by a heating component. Finally, the surfaces of the composite film are mutually adhered to complete the encapsulation step, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solutions: A stretching and forming packaging machine for a flexible high-barrier composite film, including: a working base, on the top of which a collaborative encapsulation mechanism, a film stretching mechanism, and a smoothing mechanism are respectively fixedly installed;

[0009] The collaborative encapsulation mechanism includes a load-carrying sleeve, which is fixedly inserted on the top of the working base. The outer wall of the working base is fixedly installed with a reinforcing plate A through a set of screws. The outer wall of the reinforcing plate A is welded with a U-shaped frame. A round hole is preset on the top of the U-shaped frame, and a connecting ring B is fixedly installed on the inner wall of the round hole. A hydraulic rod is fixedly inserted into the inner wall of the connecting ring B. The output end of the hydraulic rod is fixedly sleeved with a reinforcing plate B. The bottom of the reinforcing plate B is fixedly installed with a top cover. Four grooves are opened at the bottom of the top cover. Between the two inner walls of each of the four grooves, a metal rod is fixedly inserted, and a movable plate is movably sleeved on the outer wall of each metal rod. The bottoms of the four movable plates are all fixedly installed with pressing plates. Inner connecting grooves A are opened at the bottoms of the four pressing plates. A flat-headed pin cutter is movably arranged inside each of the four inner connecting grooves A. Inner connecting grooves B are opened on the opposite sides of two of the four pressing plates. Conductive plates are fixedly installed inside the two inner connecting grooves B.

[0010] Preferably, a plurality of support rods are fixedly inserted at the bottom of the load-carrying sleeve. A connecting ring A is fixedly sleeved between the outer walls of the plurality of support rods. An electric telescopic rod A is fixedly inserted into the inner wall of the connecting ring A. The output end of the electric telescopic rod A penetrates the bottom of the load-carrying sleeve and is located inside the load-carrying sleeve. The output end of the electric telescopic rod A is fixedly sleeved with a tray.

[0011] Preferably, four external frames A are fixedly installed on the outer wall of the top cover. A set of pneumatic rods A are fixedly inserted into each of the four external frames A. The output ends of each set of pneumatic rods A are respectively connected to the outer wall of the pressing plate.

[0012] Preferably, a set of pneumatic rods B are fixedly installed on the top of the inner wall of each of the four inner connecting grooves A. The output ends of each set of pneumatic rods B are respectively connected to the top of the flat-headed pin cutter.

[0013] Preferably, the film stretching mechanism includes two slideways, the bottoms of the two slideways are fixedly installed on the top of the working base, and electric telescopic rods B are fixedly installed on the inner walls of the two slideways.

[0014] Preferably, sliders are movably arranged inside the two slideways, the output ends of the two electric telescopic rods B are respectively fixedly inserted into the sliders, an external frame B is fixedly installed between the tops of the two sliders, and an electromagnet plate is fixedly installed inside the external frame B.

[0015] Preferably, two metal sliding rods are movably inserted into the top of the external frame B, a metal baffle is fixedly installed between the bottoms of the two metal sliding rods, limit buckles are fixedly installed on the tops of the two metal sliding rods, and active springs are welded between the bottom of each of the two limit buckles and the top of the external frame B.

[0016] Preferably, the flattening mechanism includes a reinforcing plate C, the outer wall of the reinforcing plate C is fixedly installed on the rear surface of the working base, a supporting metal frame is welded on the outer wall of the reinforcing plate C, two track grooves are opened on the top of the supporting metal frame, two bearing plates are fixedly installed on the top of the working base, four linkage rods are movably inserted between the opposite sides of the two bearing plates, roller rods are fixedly sleeved on the outer walls of the four linkage rods, rollers are fixedly sleeved on one ends of the outer walls of the four linkage rods, belts are movably sleeved between the outer walls of every two of the four rollers, and four supporting feet are fixedly inserted into the top of the working base.

[0017] A usage method of a flexible high-barrier composite film stretching and forming packaging machine includes the following steps:

[0018] Step 1: First, place the rolled composite film between the two track grooves, then place the port of the composite film between the external frame B and the metal baffle, energize the electromagnet plate in the external frame B, and its generated adsorption effect quickly attracts the metal baffle, and finally fix one end of the composite film between the external frame B and the metal baffle.

[0019] Step 2: Further start the electric telescopic rod B in the slideway and execute the contraction command. At this time, drive the slider to move in the slideway and make the external frame B with one end of the composite film continue to move forward. Before that, place the boxes to be processed into the loading sleeves in turn. When the external frame B pulls part of the composite film to cover the top of the box, start the electric telescopic rod A in the connecting ring A to drive the box on the tray to move upward and lift part of the composite film.

[0020] Step 3: Start the hydraulic rod in the U-shaped frame to drive the top cover to move downward and gradually contact the plastic film. At this time, the downward pressure of the extrusion plate forces the composite film to be stretched in length and causes a quantitative deformation of the composite film, and finally the composite film completely covers the outer surface of the box body.

[0021] Step 4: When the composite film reaches a certain length, start the pneumatic rod B in the internal connection groove A to quickly push the flat head pin cutter to cut the composite film to be used. When it is completed, quickly retract it. Then start the pneumatic rod A on the external connection frame A. Using the movable connection between the groove and the metal rod, push the extrusion plate to fold the composite film extending at the bottom of the box body. At the same time, the box body disengages from the tray and enters the top cover.

[0022] Step 5: When the extended composite film is folded neatly, energize the conductive plate in the internal connection groove B. The high temperature generated inside it will gradually soften the composite film at the bottom of the box body. Finally, the partially melted and decomposed composite film will adhere to the upper composite film to complete the encapsulation step.

[0023] Preferably, in the above Step 1: After the coiled composite film is installed at the track groove, find the port of the composite film and first pass it through between the four roller rods. When the external connection frame B is pulled, the composite film generates forward power, which will drive the four roller rods to roll and flatten the unfolded part of the composite film.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. By setting a collaborative encapsulation mechanism, the present invention first moves part of the composite film onto the packaging box body, starts the downward pressing component in the mechanism, and uses the method of extrusion molding to evenly cover part of the complete composite film on the surface of the box body. As the downward pressing height decreases, part of the composite film completely adheres to the outer surface of the box body. When the downward pressing component works, it will generate a downward pulling force, prompting the composite film to deform and extending a certain length of the composite film at the bottom of the box body. At this time, use a tool to cut the composite film covering the lower part of the box body to make it separate from the whole composite film, and then use the retracting component to fold and regularize the composite film extending at the bottom of the box body to make it adhere to the bottom of the box body. Finally, seal the composite film at the bottom of the box body through the heating component, so that the area of the composite film required for each packaging box can reach an appropriate amount, avoiding waste of the composite film.

[0026] 2. By setting a film stretching mechanism, using the principle of magnetic material adsorption on metal components, the area of the components in contact with the composite film is increased, so that part of the composite film is fully clamped between the electromagnetic components and the metal material. When the length of the composite film needs to be stretched, it avoids the problem that the composite film falls off during stretching due to the loose connection between the composite film and the clamping components, improving the continuous working ability of the equipment.

[0027] 3. In the present invention, by providing a flattening mechanism, after the production of the composite film is completed, winding treatment is required. As the storage time of the wound composite film increases, slight deformation will occur. When it is unrolled and used again, local bending will occur on the surface of the composite film. While pulling the composite film by the stretching component, the composite film is first flattened by this mechanism, effectively preventing the phenomenon of curling on the surface of the composite film. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional front view structure diagram of a flexible high-barrier composite film stretching and forming packaging machine and its using method according to the present invention.

[0029] Figure 2 It is a three-dimensional top view structure diagram of a flexible high-barrier composite film stretching and forming packaging machine and its using method according to the present invention.

[0030] Figure 3 It is a three-dimensional bottom view structure diagram of a flexible high-barrier composite film stretching and forming packaging machine and its using method according to the present invention.

[0031] Figure 4 It is a three-dimensional disassembled structure diagram of a flexible high-barrier composite film stretching and forming packaging machine and its using method according to the present invention.

[0032] Figure 5 It is a three-dimensional enlarged structure diagram of a part of a flexible high-barrier composite film stretching and forming packaging machine and its using method according to the present invention.

[0033] Figure 6 It is a flexible high-barrier composite film stretching and forming packaging machine and its using method according to the present invention Figure 5 The three-dimensional enlarged structure diagram of the structure at A in the figure.

[0034] Figure 7 It is a flexible high-barrier composite film stretching and forming packaging machine and its using method according to the present invention Figure 3 The three-dimensional enlarged structure diagram of the structure at B in the figure.

[0035] In the figure: 1, working base; 201, load sleeve; 202, support rod; 203, connecting ring A; 204, electric telescopic rod A; 205, tray; 206, reinforcing plate A; 207, U-shaped frame; 208, connecting ring B; 209, hydraulic rod; 210, reinforcing plate B; 211, top cover; 212, groove; 213, movable plate; 214, extrusion plate; 215, external frame A; 216, pneumatic rod A; 217, internal slot A; 218, pneumatic rod B; 219, flat head pin cutter; 220, internal slot B; 221, conductive plate; 301, slideway; 302, electric telescopic rod B; 303, slider; 304, external frame B; 305, electromagnetic plate; 306, metal slide bar; 307, limit buckle; 308, metal baffle; 309, active spring; 401, reinforcing plate C; 402, support metal frame; 403, track groove; 404, bearing plate; 405, linkage rod; 406, roller rod; 407, roller; 408, belt; 5, support feet. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1-7 As shown in the figure, the present invention provides a technical solution: a flexible high-barrier composite film stretching and forming packaging machine, including: a working base 1, and a collaborative encapsulation mechanism, a film stretching mechanism, and a flattening mechanism are respectively fixedly installed on the top of the working base 1.

[0038] According to Figures 1-6As shown in the figure, the co-packaging mechanism includes a load-carrying sleeve 201. The load-carrying sleeve 201 is fixedly inserted at the top of the working base 1. A reinforcing plate A206 is fixedly installed on the outer surface wall of the working base 1 through a set of screws. A U-shaped frame 207 is welded on the outer surface wall of the reinforcing plate A206. A round hole is preset at the top of the U-shaped frame 207, and a connecting ring B208 is fixedly installed on the inner surface wall of the round hole. A hydraulic rod 209 is fixedly inserted into the inner surface wall of the connecting ring B208. A reinforcing plate B210 is fixedly sleeved on the output end of the hydraulic rod 209. A top cover 211 is fixedly installed at the bottom of the reinforcing plate B210. Four grooves 212 are opened at the bottom of the top cover 211. Metal rods are fixedly inserted between the two inner walls of each of the four grooves 212, and a movable plate 213 is movably sleeved on the outer surface wall of each metal rod. A pressing plate 214 is fixedly installed at the bottom of each of the four movable plates 213. An inner connecting groove A217 is opened at the bottom of each of the four pressing plates 214. A flat-headed pin cutter 219 is movably arranged inside each of the four inner connecting grooves A217. Inner connecting grooves B220 are opened on the opposite sides of two of the four pressing plates 214. Conductive plates 221 are fixedly installed inside each of the two inner connecting grooves B220. When the top cover 211 works under the action of the hydraulic rod 209, it continuously presses the packaging box in the tray 205, and makes the composite film evenly cover the outer wall of the box body. Then, the flat-headed pin cutter 219 is used to cut the required part of the composite film. After the cutting is completed, the pressing plate 214 is retracted to fold and regularize the part of the composite film extending at the bottom of the box body. Finally, by energizing the conductive plate 221, the composite film in contact with it is melted and adhered to the surface of the upper layer of the composite film.

[0039] According to Figures 1-4 As shown in the figure, a plurality of support rods 202 are fixedly inserted at the bottom of the load-carrying sleeve 201. A connecting ring A203 is fixedly sleeved between the outer surface walls of the plurality of support rods 202. An electric telescopic rod A204 is fixedly inserted into the inner surface wall of the connecting ring A203. The output end of the electric telescopic rod A204 penetrates the bottom of the load-carrying sleeve 201 and is located inside the load-carrying sleeve 201. A tray 205 is fixedly sleeved on the output end of the electric telescopic rod A204. By setting the electric telescopic rod A204, the box body placed on the tray 205 can be lifted to provide height support for the packaging of the box body.

[0040] According to Figures 1-5 As shown in the figure, four external frames A215 are fixedly installed on the outer surface wall of the top cover 211. A set of pneumatic rods A216 are fixedly inserted into each of the four external frames A215. The output ends of each set of pneumatic rods A216 are respectively connected to the outer surface wall of the pressing plate 214. By setting the pneumatic rods A216, after the composite film cutting is completed, the pressing plate 214 is quickly pushed to fold the extended part of the composite film and make it fully contact the bottom of the box body.

[0041] According to Figures 1-6As shown, at the top of the inner wall of each of the four inscribed grooves A217, a set of pneumatic rods B218 are fixedly installed. The output ends of each set of pneumatic rods B218 are respectively connected to the top of the flat head pin cutter 219. By setting the pneumatic rods B218, the flat head pin cutter 219 can be quickly pushed, enabling the flat head pin cutter 219 to have a downward impact force and quickly cut the composite film.

[0042] According to Figures 1-4 and Figure 7 As shown, the film stretching mechanism includes two slideways 301. The bottoms of the two slideways 301 are fixedly installed on the top of the working base 1. Electric telescopic rods B302 are fixedly installed on the inner walls of the two slideways 301. By setting the electric telescopic rods B302, power support is provided for stretching the composite film.

[0043] According to Figures 1-4 and Figure 7 As shown, sliders 303 are movably arranged inside the two slideways 301. The output ends of the two electric telescopic rods B302 are respectively fixedly inserted into the sliders 303. An external frame B304 is fixedly installed between the tops of the two sliders 303. An electromagnet plate 305 is fixedly installed inside the external frame B304. By utilizing the movable connection between the sliders 303 and the slideways 301, after retracting the electric telescopic rods B302, the components on the external frame B304 can be driven to move forward.

[0044] According to Figures 1-4 and Figure 7 As shown, two metal slide rods 306 are movably inserted into the top of the external frame B304. A metal baffle 308 is fixedly installed between the bottoms of the two metal slide rods 306. Limit buckles 307 are fixedly installed on the tops of the two metal slide rods 306. Active springs 309 are welded between the bottom of each of the two limit buckles 307 and the top of the external frame B304. By energizing the electromagnet plate 305, the generated adsorption effect gradually acts on the metal baffle 308, causing it to move upward and clamp a part of the composite film placed therein. When the metal baffle 308 moves upward, the active springs 309 will be stretched, and the generated reaction force provides conditions for the reset of the metal baffle 308.

[0045] According to Figures 1-4As shown, the smoothing mechanism includes a reinforcing plate C401, the outer wall of the reinforcing plate C401 is fixedly installed on the rear surface of the working base 1, the outer wall of the reinforcing plate C401 is welded with a supporting metal frame 402, the top of the supporting metal frame 402 is provided with two track grooves 403, two bearing plates 404 are fixedly installed on the top of the working base 1, four linkage rods 405 are movably inserted on the opposite sides of the two bearing plates 404, the outer walls of the four linkage rods 405 are all fixedly sleeved with rollers 406, one end of the outer walls of the four linkage rods 405 are all fixedly sleeved with rollers 407, and the outer walls of every two of the four rollers 407 are movably sleeved with belts 408, and the top of the working base 1 is fixedly inserted with four supporting legs 5, and by utilizing the mass of the rollers 406 themselves, when the composite film is located in the rollers 406, the surface of the composite film can be quickly flattened.

[0046] The effect achieved by the entire mechanism is as follows: first, the device is moved to the designated working area, the rolled composite film is placed between the two track grooves 403, and then the box body to be packaged is placed in the loading sleeve 201 and placed on the top of the tray 205, the port of the composite film is found, and part of the composite film is pulled and placed between the external frame B304 and the metal baffle 308, and the electromagnetic plate 305 is energized, and the generated magnetic force will adsorb the metal baffle 308, so that the metal baffle 308 rises to a certain height and finally fits on the top of the inner wall of the external frame B304 to fix the composite film, start the external frame B304 in the slide 301, pull the composite film fixed on the external frame B304, extract a part of the composite film to cover the top of the box body, and then start the electric telescopic rod A204 to drive the box body on the tray 205 to move upward continuously, and finally make the box body completely detach from the loading sleeve 2 01, so that the top of the box body is fully in contact with the bottom surface of the composite film, at this time, the hydraulic rod 209 is started to drive the top cover 211 to descend, and when the extrusion plate 214 contacts the surface of the composite film, it is pressed against the outer wall of the box body and undergoes quantitative deformation under the action of pressure, and the pneumatic rod B218 is further started to quickly push the flat-head pin knife 219 in the inner groove A217 to cut the composite film, and then the pneumatic rod A216 is started, and the movable connection between the metal rod and the movable plate 213 is used to push the extrusion plate 214 to cover the cut part of the composite film on the bottom of the box body. At the same time, the entire box body together with part of the composite film enters the top cover 211 and is separated from the tray 205, and finally the conductive plate 221 in the inner groove B220 is energized, and the height generated on its surface will gradually melt the composite film in contact with it, and then the power supply in the conductive plate 221 is disconnected, and the melted part of the composite film will adhere to the upper layer of composite film after drying.

[0047] The present invention also provides a method for using a flexible high-barrier composite film stretching and forming packaging machine, comprising the following steps:

[0048] Step 1: First, place the rolled composite film between the two track grooves 403, and then place the end of the composite film between the external frame B304 and the metal baffle 308. Electrify the electromagnetic plate 305 in the external frame B304, and the adsorption effect it generates quickly attracts the metal baffle 308, finally fixing one end of the composite film between the external frame B304 and the metal baffle 308.

[0049] Step 2: Further start the electric telescopic rod B302 in the slideway 301 and execute the contraction command. At this time, drive the slider 303 to move in the slideway 301, and make the external frame B304 with one end of the composite film continue to move forward. Before that, place the boxes to be processed into the loading sleeves 201 in turn. When the external frame B304 pulls part of the composite film to cover the top of the box, start the electric telescopic rod A204 in the connecting ring A203, drive the box on the tray 205 to move upward, and lift part of the composite film.

[0050] Step 3: Start the hydraulic rod 209 in the U-shaped frame 207 to drive the top cover 211 to move downward and gradually contact the plastic film. At this time, the downward pressure of the extrusion plate 214 forces the composite film to be stretched in length and makes the composite film undergo a quantitative deformation, finally making the composite film completely cover the outer surface of the box.

[0051] Step 4: When the composite film reaches a certain length, start the pneumatic rod B218 in the internal slot A217 to quickly push the flat head pin cutter 219 to cut the composite film to be used. When it is completed, quickly retract it. Then start the pneumatic rod A216 on the external frame A215, and use the movable connection between the groove 212 and the metal rod to push the extrusion plate 214 to fold the composite film extending at the bottom of the box. At the same time, the box detaches from the tray 205 and enters the top cover 211.

[0052] Step 5: When the extended composite film is folded neatly, electrify the conductive plate 221 in the internal slot B220. The high temperature generated inside it will gradually soften the composite film at the bottom of the box. Finally, part of the melted and decomposed composite film will adhere to the upper composite film to complete the encapsulation step.

[0053] The usage method of the whole flexible high-barrier composite film stretching and forming packaging machine is roughly the same as that of the above flexible high-barrier composite film stretching and forming packaging machine. The main difference is that when there is a rolled composite film at the track groove 403, find the end of the composite film, first pass through between the four roller rods 406. When the external frame B304 is pulling, it generates forward power for the composite film, which will drive the four roller rods 406 to roll at this time. During this process, the rollers 407 on the linkage rod 405 rotate synchronously. Under the action of the belt 408, the rotation speeds of every two rollers 407 reach coordination, and the unfolded part of the composite film is flattened.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for using a stretching and forming packaging machine for a flexible high-barrier composite film, characterized in that: The flexible high-barrier composite film stretching and forming packaging machine includes a working base (1), and a cooperative encapsulation mechanism, a film stretching mechanism, and a smoothing mechanism are respectively fixedly installed on the top of the working base (1); The cooperative encapsulation mechanism includes a load-carrying sleeve (201), the load-carrying sleeve (201) is fixedly inserted on the top of the working base (1), a reinforcing plate A (206) is fixedly installed on the outer wall of the working base (1) through a set of screws, a U-shaped frame (207) is welded on the outer wall of the reinforcing plate A (206), a round hole is preset on the top of the U-shaped frame (207), and a connecting ring B (208) is fixedly installed on the inner wall of the round hole. A hydraulic rod (209) is fixedly inserted into the inner wall of the connecting ring B (208), a reinforcing plate B (210) is fixedly sleeved on the output end of the hydraulic rod (209), a top cover (211) is fixedly installed at the bottom of the reinforcing plate B (210), four grooves (212) are opened at the bottom of the top cover (211), metal rods are fixedly inserted between the two sides of the inner wall of each of the four grooves (212), and a movable plate (213) is movably sleeved on the outer wall of each metal rod. A pressing plate (214) is fixedly installed at the bottom of each of the four movable plates (213), an inner connecting groove A (217) is opened at the bottom of each of the four pressing plates (214), a flat-head pin cutter (219) is movably arranged inside each of the four inner connecting grooves A (217), inner connecting grooves B (220) are opened on the opposite sides of two of the four pressing plates (214), and a conductive plate (221) is fixedly installed inside each of the two inner connecting grooves B (220); A plurality of support rods (202) are fixedly inserted at the bottom of the load-carrying sleeve (201), a connecting ring A (203) is fixedly sleeved between the outer walls of the plurality of support rods (202), an electric telescopic rod A (204) is fixedly inserted into the inner wall of the connecting ring A (203), the output end of the electric telescopic rod A (204) penetrates through the bottom of the load-carrying sleeve (201) and is located inside the load-carrying sleeve (201), and a tray (205) is fixedly sleeved on the output end of the electric telescopic rod A (204); Four external frames A (215) are fixedly installed on the outer wall of the top cover (211), a set of pneumatic rods A (216) are fixedly inserted into the inside of each of the four external frames A (215), and the output ends of each set of pneumatic rods A (216) are respectively connected to the outer wall of the pressing plate (214); A set of pneumatic rods B (218) are fixedly installed on the top of the inner wall of each of the four inner connecting grooves A (217), and the output ends of each set of pneumatic rods B (218) are respectively connected to the top of the flat-head pin cutter (219); The film stretching mechanism includes two slideways (301), the bottoms of the two slideways (301) are fixedly installed on the top of the working base (1), and electric telescopic rods B (302) are fixedly installed on the inner walls of the two slideways (301); Sliders (303) are movably arranged inside both of the two slideways (301). The output ends of the two electric telescopic rods B (302) are respectively fixedly inserted into the insides of the sliders (303). An external frame B (304) is fixedly installed between the tops of the two sliders (303). An electromagnet plate (305) is fixedly installed inside the external frame B (304); Two metal slide rods (306) are movably inserted into the top of the external frame B (304). A metal baffle (308) is fixedly installed between the bottoms of the two metal slide rods (306); The flattening mechanism includes a reinforcing plate C (401). The outer wall of the reinforcing plate C (401) is fixedly installed on the rear surface of the working base (1). A supporting metal frame (402) is welded to the outer wall of the reinforcing plate C (401). Two track grooves (403) are formed in the top of the supporting metal frame (402). Two bearing plates (404) are fixedly installed on the top of the working base (1). Four linkage rods (405) are movably inserted into the opposite sides of the two bearing plates (404). Roller rods (406) are fixedly sleeved on the outer walls of the four linkage rods (405); Comprising the following steps: S1: First, place the rolled composite film between the two track grooves (403), and then place the port of the composite film between the external frame B (304) and the metal baffle (308). Power on the electromagnet plate (305) in the external frame B (304). The adsorption effect generated by it quickly attracts the metal baffle (308), and finally fixes one end of the composite film between the external frame B (304) and the metal baffle (308); S2: Further start the electric telescopic rod B (302) in the slideway (301) and execute the contraction command. At this time, drive the slider (303) to move in the slideway (301), and make the external frame B (304) with one end of the composite film continue to move forward. Before that, sequentially place the boxes to be processed into the load sleeves (201). When the external frame B (304) pulls part of the composite film to cover the top of the box, start the electric telescopic rod A (204) in the connecting ring A (203) to drive the box on the tray (205) to move upward and lift part of the composite film; S3: Start the hydraulic rod (209) in the U-shaped frame (207) to drive the top cover (211) to move downward and gradually contact the plastic film. At this time, the downward pressure of the pressing plate (214) forces the composite film to be stretched in length and causes a quantitative deformation of the composite film, and finally makes the composite film completely cover the outer surface of the box; S4: When the composite film reaches a certain length, start the pneumatic rod B (218) in the internal slot A (217) to quickly push the flat head pin cutter (219) to cut the composite film to be used. After completion, quickly retract it. Then start the pneumatic rod A (216) on the external frame A (215). Utilize the movable connection between the groove (212) and the metal rod to push the extrusion plate (214) to fold the composite film extending at the bottom of the box body. At the same time, the box body detaches from the tray (205) and enters the top cover (211). S5: When the extended composite film is folded neatly, energize the conductive plate (221) in the internal slot B (220). The high temperature generated inside will gradually soften the composite film at the bottom of the box body. Eventually, the partially melted and decomposed composite film will adhere to the upper composite film to complete the encapsulation step. In the said S1: When a roll of composite film is installed at the track groove (403), find the port of the composite film and first pass it through between the four roller rods (406). When the external frame B (304) is pulled, it generates forward power for the composite film. At this time, it will drive the four roller rods (406) to roll and flatten the unfolded part of the composite film.

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