Thermoplastic film packaging machine for juice packaging

Abstract

The present application belongs to the technical field of thermoplastic film packaging machine, especially a thermoplastic film packaging machine for fruit juice packaging, which comprises a shrinkage furnace, the inside of the shrinkage furnace is provided with a circulating system, the circulating system drives the circulation of gas in the shrinkage furnace and heats the gas, the circulating system blows hot gas from the bottom to the bottom surface of the cladding piece, and the left and right ends of the shrinkage furnace are both provided with a gas closing structure; the shrinkage furnace can transport the cladding piece to move to the right, so that the cladding piece becomes a finished product by passing through the heat shrinkage environment, the circulating system can make the hot gas flow in the shrinkage furnace circulate, the hot gas flow is recycled, the heat loss is minimized, the heat utilization rate is high, the gas loss channel of the hot gas flow can be reduced through the gas closing structure, the heat loss is further reduced, the heat utilization rate is higher, the gas loss channel of the hot gas flow can be reduced again through the elastic film on the gas closing structure, the heat loss is reduced again, and the heat utilization rate is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of thermoplastic film packaging machine technology, and more particularly to a thermoplastic film packaging machine for fruit juice packaging. Background Technology

[0002] In juice production and packaging lines, thermoplastic film packaging machines are key equipment for achieving moisture-proof, dust-proof, and fixed grouping of products. Shrink ovens are the core execution units in thermoplastic film packaging machines. They receive the packaging components output from the front-end sealing and cutting machine, and through the action of hot airflow, the thermoplastic film is heated and shrunken, tightly adhering to the product surface to complete the final packaging. The core structure of a traditional shrink oven usually includes an oven body, heating components, a conveying mechanism, and a blowing system. During operation, the packaging components are conveyed through the oven cavity at a uniform speed by the conveying mechanism. After the heating components are powered on, they heat the air inside the oven. The blowing system drives the hot air to blow onto the packaging components. Under the action of the hot airflow, the thermoplastic film softens, shrinks, and adheres to the juice bottle, ultimately forming a neat packaged product.

[0003] Existing shrink ovens used for juice packaging require large openings at both ends to accommodate the entry and exit of the packaging components. This results in a large amount of hot air leaking out of the oven, leading to low heat utilization. Furthermore, the ovens often use long-distance diffusion-type air supply, which causes significant heat loss during the diffusion process, resulting in high energy consumption, uneven heating, and difficulty in tightly fitting the bottle edges when the film shrinks, which can easily cause defects such as bubbles and wrinkles.

[0004] Therefore, we propose a thermoplastic film packaging machine for juice packaging. Summary of the Invention

[0005] To overcome the above-mentioned shortcomings in the prior art, the present invention aims to provide a thermoplastic film packaging machine for fruit juice packaging that has high heat utilization rate, uniform heating of the covering parts, and stable packaging quality.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] A thermoplastic film packaging machine for fruit juice packaging includes a shrink oven. The shrink oven has an internal circulation system that drives the gas inside the shrink oven to circulate and heat the gas. The circulation system blows hot air from below onto the bottom surface of the package. Both the left and right ends of the shrink oven are equipped with air-sealing structures. When the package moves in the air-sealing structures, it blocks part of the air passages. The shrink oven has two side blowing mechanisms and one top blowing mechanism inside. The two side blowing mechanisms are located on the front and rear sides of the top blowing mechanism, respectively. The two side blowing mechanisms approach the package from the front and rear sides and blow hot air onto the front and rear surfaces of the package. The top blowing mechanism approaches the top surface of the package from above and blows hot air onto the top surface of the package.

[0008] Preferably, the shrink furnace includes a support shell, a square tube outer shell is fixedly connected to the top surface of the support shell, a square tube inner shell is coaxially inserted inside the square tube outer shell, a circulation system is located inside the square tube inner shell, an insulation interlayer is formed between the inner wall of the square tube outer shell and the outer surface of the square tube inner shell, an outlet box is fixedly installed at both ends of the support shell, a mesh conveyor belt is installed between the two outlet boxes, a power mechanism for driving the mesh conveyor belt to rotate is installed on the outlet box, the bottom walls of the square tube outer shell and the square tube inner shell both pass through the mesh conveyor belt, a control box is fixedly installed at the right end of the top surface of the square tube outer shell, the control box is connected to the external control panel for signal transmission, and the control box is electrically connected to the power mechanism.

[0009] Preferably, the circulation system includes an outer square tube that is coaxially inserted into the inner shell of a square tube. A reflux interlayer is formed between the inner wall of the inner shell and the outer surface of the outer square tube. An inner square tube is coaxially inserted into the outer square tube. A buffer chamber is formed between the outer surface of the inner square tube and the inner wall of the outer square tube. The outer shell, inner shell, outer square tube, and left ends of the inner square tube are fixed to a square frame by bolts. The right end of the tube and the inner square tube of the partition are fixed to another square frame by bolts. The two square frames are of the same size, and the inner wall of the square frame is flush with the inner wall of the inner square tube of the partition. The bottom walls of both the outer and inner square tubes of the partition pass through the mesh conveyor belt. Spray holes are opened on the bottom surface of the inner cavity of the inner square tube of the partition. The spray holes are connected to the buffer air chamber and blow hot air onto the bottom surface of the covering. The side blowing mechanism and the top blowing mechanism are both located inside the inner square tube of the partition. Two fixing holes are symmetrically opened on the top surface of both the outer and inner square tubes. The fixing holes are located at the right end of the outer square tube. Two circulation holes are opened on the top surface of the outer square tube of the partition. The two circulation holes are aligned with the two fixing holes on the outer square tube. A power motor is fixedly inserted into the two fixing holes on the outer square tube. The bottom end of the power motor is inserted into the fixing hole on the inner square tube, and the power motor blocks the fixing hole. An impeller is fixedly sleeved on the bottom end of the output shaft of the power motor. The impeller is located inside the circulation hole. The outer side of the output shaft of the power motor is movably sleeved on the impeller. A vortex heating wire is bolted to the top surface of the inner square tube of the partition. An air outlet is opened on the top surface of the inner square tube at its right end, which connects the inner cavity of the inner square tube to the buffer air chamber. Positioning holes are opened on the front and rear surfaces of the inner and outer square tubes of the partition at their left ends. The same return pipe is fixedly inserted into the two positioning holes on the same side wall of the outer and inner square tubes of the partition, which connects the inner cavity of the inner square tube to the return interlayer cavity.

[0010] Preferably, the air-tight structure includes a fixed track, which is fixedly connected to the surface of the square frame away from the outer shell of the square tube. The inner wall of the square frame is flush with the inner wall of the fixed track. The fixed track is a U-shaped frame with its opening facing downwards. The end face of the fixed track is L-shaped. A fastening slide rail is fastened to the outside of the fixed track. The fastening slide rail is a U-shaped frame with its opening facing downwards. An air-tight plate is fixedly connected to the inner side wall of the fastening slide rail. The air-tight plate blocks the opening of the square frame. The bottom end of the air-tight plate is suspended above the top surface of the mesh conveyor belt. An air-tight tube located in the middle of its bottom end is fixedly inserted into the surface of the air-tight plate away from the outer shell of the square tube. The bottom end of the air-tight tube is open and is adapted to the covering. Two guide plates are fixedly connected to the end face of the air-tight tube away from the air-tight plate. The two guide plates are symmetrical front and back. The free ends of the two guide plates extend obliquely to the front and rear sides respectively. An inclined brace is fixedly connected between the top surface of the air-tight tube and the surface of the air-tight plate away from the outer shell of the square tube.

[0011] Preferably, three mounting holes are equally spaced on both the front and rear sides of the air-tight tube. The bottom of each mounting hole is open. The three mounting holes on the front side of the air-tight tube correspond one-to-one with the three mounting holes on the rear side of the air-tight tube. The same elastic membrane is inserted into the corresponding two mounting holes on the front and rear sides of the air-tight tube with an interference fit. A perforation is provided on the bottom surface of the elastic membrane. The size of the perforation is slightly smaller than that of the covering. Limit strips are fixedly connected to both the front and rear ends of the elastic membrane.

[0012] Preferably, the side-blowing mechanism includes two approach plates, which are symmetrically arranged inside the inner square tube of the partition. A telescopic approach rod is fixedly connected to the two mutually distant surfaces of each approach plate, with its inner protruding end fixedly connected to the surface of the approach plate. One end of the telescopic approach rod extends to the outside of the outer shell of the square tube, and the other end is fixedly inserted into the side wall of the outer shell, inner shell, outer square tube, and inner square tube of the partition. Guide telescopic rods are fixedly connected to the four corners of the sides of the approach plates connected to the telescopic approach rods. The inner protruding end of the guide telescopic rod is fixedly connected to the surface of the approach plate, and the other end is fixedly inserted into the side wall of the inner and outer square tubes of the partition. A rectangular shell is fixedly connected to the right end of each of the two approach plates. Multiple air distribution holes are equidistantly opened on the left end face of the rectangular shell. On the side of the approach plate away from the approach telescopic rod, a constant pressure hole is opened on the side of the rectangular shell near the approach telescopic rod. An elastic tube is fixedly connected to the side of the rectangular shell near the approach telescopic rod. The elastic tube is connected to the constant pressure hole. The end of the elastic tube away from the rectangular shell is fixedly connected to the inner wall of the inner square tube of the partition. Both the front and rear sides of the inner square tube of the partition have a transition hole at its right end. The transition hole connects the elastic tube to the buffer air chamber. A reinforcing plate is fixedly connected to the left end of both approach plates. An elastic compensation tube is fixedly connected to the side of the reinforcing plate facing the inner wall of the inner square tube of the partition. The other end of the elastic compensation tube is fixedly connected to the inner wall of the inner square tube of the partition. Multiple air distribution pipes are installed between the reinforcing plate and the rectangular shell. The multiple air distribution pipes correspond one-to-one with multiple air distribution holes. The corresponding air distribution pipes and air distribution holes are connected. Multiple air blowing holes are opened on the air distribution pipes. The distance between two adjacent air blowing holes gradually decreases from right to left.

[0013] Preferably, the outer sleeve is slidably connected to the outside of the air distribution pipe. The right end of the outer sleeve is fixedly connected to the left end face of the rectangular shell, and the left end of the outer sleeve is fixedly connected to the right end face of the reinforcing plate. An air distribution window is opened on the surface of the outer sleeve away from the approach plate, and the air distribution window is adapted to the air blowing hole.

[0014] Preferably, a first ranging probe is fixedly inserted on both the front and rear sides of the square tube shell. One end of the first ranging probe is exposed on the outside of the square tube shell, and the other end of the first ranging probe extends into the interior of the square tube inside the partition and is aligned with the approach plate.

[0015] Preferably, the top-blowing mechanism includes an electric telescopic rod, which is fixedly inserted into the center of the top surface of the square tube shell. The bottom end of the electric telescopic rod extends downward into the interior of the inner square tube of the partition. An approach bar is fixedly connected to the bottom end of the protruding rod inside the electric telescopic rod. A linkage plate is fixedly connected to the right end of the approach bar. The linkage plate is located on the right side of the side-blowing mechanism. A positioning groove is opened on the top surface of the linkage plate. A first telescopic tube is fixedly connected to the top surface of the linkage plate. The first telescopic tube communicates with the positioning groove. The top end of the first telescopic tube is fixedly connected to the top surface of the inner cavity of the inner square tube of the partition and communicates with the air outlet. A linkage block is fixedly connected to the left end of the approach bar. The linkage block is located on the left side of the side-blowing mechanism. A second telescopic tube is fixedly connected to the top surface of the linkage block. The top end of the second telescopic tube is fixedly connected to the top surface of the inner cavity of the inner square tube of the partition. Multiple top-blowing tubes are installed at equal intervals between the linkage plate and the linkage block. The right end of the top-blowing tube communicates with the positioning groove. Multiple through holes facing directly downward are opened on the surface of the top-blowing tube. The distance between two adjacent through holes gradually decreases from the right end to the left end.

[0016] Preferably, a second ranging probe is fixedly inserted into the top surface of the square tube shell, and the bottom end of the second ranging probe extends downward into the interior of the inner square tube of the partition and points towards the top surface of the approach strip.

[0017] Preferably, the right side of the linkage block has multiple cylindrical grooves at equal intervals, and the left side of the linkage block has multiple rectangular grooves at equal intervals. The rectangular grooves correspond one-to-one with the cylindrical grooves, and the corresponding cylindrical grooves and rectangular grooves are interconnected. The left end of the top blowing pipe is movably inserted into the cylindrical groove and extends into the rectangular groove, and is fixedly connected to a rectangular block. The rectangular block is inserted into the rectangular groove. The right end of the top blowing pipe is fixedly connected to a hollow cone with a vent hole. A limit stop is fixedly connected to the bottom surface of the positioning groove cavity. Multiple insertion holes are equally spaced on the left side of the linkage plate and on the limit stop. The insertion holes on the limit stop correspond to the insertion holes on the left side of the linkage plate. The multiple insertion holes on the left side of the linkage plate correspond one-to-one with the multiple cylindrical grooves on the right side of the linkage block. The limit stop divides the positioning groove into left and right chambers. An elastic strip is embedded in the left chamber. The right end of the top blowing pipe passes through the insertion holes on the linkage plate, the elastic strip, and the insertion holes on the limit stop. The hollow cone is located in the right chamber.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention enables the transport of the covered part to move to the right through the shrink furnace, so that the covered part can be transformed into a finished product through the heat shrink environment. The circulation system enables the hot air flow inside the shrink furnace to circulate and be reused, minimizing heat loss and achieving high heat utilization. The air-sealing structure reduces the heat loss channels of the hot air flow, further reducing heat loss and achieving even higher heat utilization. The elastic membrane on the air-sealing structure further reduces the heat loss channels of the hot air flow, further reducing heat loss, and significantly improving heat utilization.

[0020] 2. This invention uses two side-blowing mechanisms to spray hot air from the front and rear sides of the covering component to the front and rear surfaces of the covering component, and a top-blowing mechanism to spray hot air from the top of the covering component to the top surface of the covering component. A circulation system sprays hot air from the bottom of the covering component to the bottom surface of the covering component, achieving the purpose of close-range air supply to the covering component. This can quickly transfer heat to the surface of the thermoplastic film, resulting in better heat transfer efficiency and avoiding energy waste caused by the diffusion of hot air in the furnace. The hot air sprayed close to the surface has a certain airflow impact force. While the film material softens due to heat, the impact force can press the film material to fit the edges of the bottle, reducing bubbles and wrinkles formed after the film material shrinks.

[0021] 3. By adjusting the side-blowing mechanism, the present invention can adapt the side-blowing mechanism to the height of the covering material, and by adjusting the top-blowing mechanism, it can adapt the top-blowing mechanism to the width of the covering material. This not only allows the hot airflow to act precisely on the surface of the membrane material, but also makes the heating of each part of the covering material more uniform and the heat shrinkage quality better. At the same time, the side-blowing mechanism and the top-blowing mechanism will not spray out useless airflow, avoiding heat waste and further improving heat utilization efficiency. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 For the present invention Figure 1 A schematic diagram of the three-dimensional structure after being cut along the center plane;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention 1 after being cut along another central plane;

[0025] Figure 4 For the present invention Figure 1 A schematic diagram of the three-dimensional structure after the right end is opened;

[0026] Figure 5 For the present invention Figure 4 A three-dimensional structural diagram of the square tube inside the central partition;

[0027] Figure 6 For the present invention Figure 1 A three-dimensional structural diagram of the central airtight structure;

[0028] Figure 7 For the present invention Figure 6 A schematic diagram of the three-dimensional structure from another perspective;

[0029] Figure 8 For the present invention Figure 7 A schematic diagram of the three-dimensional structure of a medium elastic membrane;

[0030] Figure 9 For the present invention Figure 2A three-dimensional structural diagram of the middle side blowing mechanism and the top blowing mechanism;

[0031] Figure 10 For the present invention Figure 9 A schematic diagram of the three-dimensional structure from another perspective;

[0032] Figure 11 For the present invention Figure 10 A three-dimensional structural diagram of the side-blowing mechanism;

[0033] Figure 12 For the present invention Figure 11 A three-dimensional structural diagram of the central approach plate;

[0034] Figure 13 For the present invention Figure 11 A three-dimensional structural diagram of the inner and outer jacket;

[0035] Figure 14 For the present invention Figure 10 A three-dimensional structural diagram of the top blowpipe.

[0036] In the diagram: 1. Shrink oven; 101. Support shell; 102. Square tube outer shell; 103. Square tube inner shell; 104. Insulation interlayer; 105. Outlet box; 106. Mesh conveyor belt; 107. Control box;

[0037] 2. Circulation system; 201. Outer square tube of partition; 202. Return jacket; 203. Inner square tube of partition; 204. Buffer chamber; 205. Fixing hole; 206. Circulation hole; 207. Power motor; 208. Impeller; 209. Vortex heating wire; 210. Air outlet; 211. Positioning hole; 212. Return pipe;

[0038] 3. Air-tight structure; 301. Fixed track; 302. Snap-on slide rail; 303. Air-tight plate; 304. Air-tight tube; 305. Guide plate; 306. Mounting hole; 307. Elastic membrane; 308. Perforation; 309. Limiting strip; 310. Diagonal brace;

[0039] 4. Side-blowing mechanism; 401. Approach plate; 402. Approach telescopic rod; 403. Guide telescopic rod; 404. Rectangular shell; 405. Air distribution hole; 406. Constant pressure hole; 407. Elastic tube; 408. Reinforcing plate; 409. Elastic compensation tube; 410. Air distribution tube; 411. Air blowing hole; 412. Outer tube; 413. Air distribution window; 414. Adapter hole; 415. First ranging probe;

[0040] 5. Top blowing mechanism; 501. Electric telescopic rod; 502. Approach bar; 503. Linkage plate; 504. Positioning groove; 505. First telescopic tube; 506. Linkage block; 507. Second telescopic tube; 508. Top blowing pipe; 509. Second ranging probe; 510. Cylindrical groove; 511. Rectangular groove; 512. Rectangular block; 513. Hollow cone; 514. Vent hole; 515. Limiting stop bar; 516. Insertion hole; 517. Elastic strip. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] In this embodiment, refer to Figure 1-14 This solution provides a thermoplastic film packaging machine for juice packaging, which includes a shrink oven 1. The shrink oven 1 is equipped with a circulation system 2. The circulation system 2 drives the gas inside the shrink oven 1 to circulate and heat the gas. The hot gas circulation can reduce heat loss.

[0043] The circulation system 2 blows hot air from below to the bottom surface of the covering. Both ends of the shrink furnace 1 are equipped with air-sealing structures 3. When the covering moves in the air-sealing structure 3, it blocks part of the air passage, reducing the amount of hot air leakage and further reducing heat loss.

[0044] The shrink furnace 1 is equipped with two side-blowing mechanisms 4 and one top-blowing mechanism 5. The two side-blowing mechanisms 4 are located on the front and rear sides of the top-blowing mechanism 5, respectively. The two side-blowing mechanisms 4 approach the covering from the front and rear sides and blow hot air onto the front and rear sides of the covering. The top-blowing mechanism 5 approaches the top surface of the covering from above and blows hot air onto the top surface of the covering. The side-blowing mechanism 4 and the top-blowing mechanism 5 approach the surface of the covering and blow hot air, which can quickly transfer heat to the surface of the thermoplastic film, resulting in better heat transfer efficiency and avoiding energy waste caused by the diffusion of hot air in the furnace. The hot air sprayed at close range has a certain airflow impact force. While the film material is softened by heat, the impact force can press the film material to fit the edges of the bottle body, reducing the bubbles and wrinkles formed after the film material shrinks.

[0045] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4The shrink furnace 1 includes a support shell 101. A square tube outer shell 102 is fixedly connected to the top surface of the support shell 101. A square tube inner shell 103 is coaxially inserted inside the square tube outer shell 102. A circulation system 2 is located inside the square tube inner shell 103. An insulation interlayer 104 is formed between the inner wall of the square tube outer shell 102 and the outer surface of the square tube inner shell 103. Outlet boxes 105 are fixedly installed at both ends of the support shell 101. A mesh conveyor belt 106 is installed between the two outlet boxes 105. A power mechanism for driving the mesh conveyor belt 106 to rotate is installed on the outlet boxes 105. The bottom walls of the square tube outer shell 102 and the square tube inner shell 103 both pass through the mesh conveyor belt 106. A control box 107 is fixedly installed at the right end of the top surface of the square tube outer shell 102. The control box 107 is connected to the external control panel for signal transmission and is electrically connected to the power mechanism.

[0046] The control panel is used to display information and set parameters.

[0047] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 The circulation system 2 includes an outer square tube 201, which is coaxially inserted into the inner square tube shell 103. A reflux interlayer 202 is formed between the inner wall of the inner square tube shell 103 and the outer surface of the outer square tube 201. An inner square tube 203 is coaxially inserted into the outer square tube 201. A buffer chamber 204 is formed between the outer surface of the inner square tube 203 and the inner wall of the outer square tube 201. The outer square tube shell 102 and the inner square tube shell 103 are also mentioned. 03. The left ends of the outer square tube 201 and the inner square tube 203 of the partition are fixed to a square frame with bolts. The right ends of the outer square tube shell 102, the inner square tube shell 103, the outer square tube 201 and the inner square tube 203 of the partition are fixed to another square frame with bolts. The two square frames are the same size. The inner wall of the square frame is flush with the inner wall of the inner square tube 203 of the partition. The square frame is used to seal the end openings of the insulation interlayer 104, the return interlayer 202 and the buffer air chamber 204.

[0048] The bottom walls of both the outer square tube 201 and the inner square tube 203 of the partition pass through the mesh conveyor belt 106. A spray hole is provided on the bottom surface of the inner cavity of the inner square tube 203, and the spray hole is connected to the buffer air chamber 204. The spray hole blows hot air onto the bottom surface of the covering. The side-blowing mechanism 4 and the top-blowing mechanism 5 are both located inside the inner square tube 203. Two fixing holes 205 are symmetrically provided on the top surfaces of both the outer and inner square tube shells 102 and 103. The fixing holes 205 are located at the right end of the outer square tube shell 102. Two circulation holes 206 are provided on the top surface of the outer square tube 201, and the two circulation holes 206 are aligned with the two fixing holes 205 on the outer square tube shell 102. A power motor 207 is fixedly inserted into the interior of each of the two fixing holes 205 on the outer square tube shell 102. The bottom end of the power motor 207 is inserted into the fixing hole 205 on the inner square tube shell 103. The power motor 207 moves the fixing hole... 205 is blocked. An impeller 208 is fixedly sleeved at the bottom end of the output shaft of the power motor 207. The impeller 208 is located inside the circulation hole 206. A vortex heating wire 209 is movably sleeved on the outside of the output shaft of the power motor 207, located above the impeller 208. The vortex heating wire 209 is bolted to the top surface of the inner square tube 203 of the partition. An air outlet 210 is opened on the top surface of the inner square tube 203, located at its right end. 10. The inner cavity of the partition inner square tube 203 is connected to the buffer air chamber 204. The front and rear surfaces of the partition outer square tube 201 and the inner cavity of the partition inner square tube 203 are provided with positioning holes 211 located at their left ends. The same return pipe 212 is fixedly inserted into the two positioning holes 211 on the same side wall of the partition outer square tube 201 and the partition inner square tube 203. The return pipe 212 connects the inner cavity of the partition inner square tube 203 with the inner cavity of the return interlayer 202.

[0049] The power motor 207 and the vortex heating wire 209 are both electrically connected to the control box 107. Temperature sensors are installed on the inner walls of the air outlet 210 and the return pipe 212. The two temperature sensors are connected to the control box 107 for signal transmission. The control box 107 determines the temperature difference between the left and right ends based on the data monitored by the two temperature sensors, and then controls the power of the vortex heating wire 209.

[0050] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The airtight structure 3 includes a fixed track 301, which is fixedly connected to the surface of the square frame away from the square tube outer shell 102. The inner wall of the square frame is flush with the inner wall of the fixed track 301. The fixed track 301 is a U-shaped frame with its opening facing downwards. The end face of the fixed track 301 is L-shaped. A snap-fit ​​slide rail 302 is fastened to the outside of the fixed track 301. The snap-fit ​​slide rail 302 is a U-shaped frame with its opening facing downwards. An airtight plate 303 is fixedly connected to the inner wall of the snap-fit ​​slide rail 302. The airtight plate 303 blocks the opening of the square frame, and the bottom end of the airtight plate 303 is suspended from the grid. Above the top surface of the conveyor belt 106, an air-sealing pipe 304 located at the middle of its bottom end is fixedly inserted into the surface of the air-sealing plate 303 away from the square tube shell 102. The bottom end of the air-sealing pipe 304 is open and is adapted to the covering. Two guide plates 305 are fixedly connected to the end face of the air-sealing pipe 304 away from the air-sealing plate 303. The two guide plates 305 are symmetrical front and back, and the free ends of the two guide plates 305 extend obliquely to the front and rear sides respectively. An inclined brace 310 is fixedly connected between the top surface of the air-sealing pipe 304 and the surface of the air-sealing plate 303 away from the square tube shell 102.

[0051] The airtight structure 3, excluding the fixed track 301, forms the replacement body. Through the snap-fit ​​action between the fixed track 301 and the snap-fit ​​slide rail 302, people can replace the replacement body more conveniently. When replacing, people only need to pull the replacement body upward to remove it.

[0052] There is a very small gap between the bottom surface of the air-sealing plate 303, the air-sealing pipe 304, and the guide plate 305 and the top surface of the mesh conveyor belt 106, ensuring that the mesh conveyor belt 106 rotates normally.

[0053] Please see Figure 6 , Figure 7 ,and Figure 8 Three mounting holes 306 are equally spaced on both the front and rear sides of the air-tight tube 304. The bottom of the mounting holes 306 is open. The three mounting holes 306 on the front side of the air-tight tube 304 correspond one-to-one with the three mounting holes 306 on the rear side of the air-tight tube 304. The same elastic membrane 307 is inserted into the corresponding two mounting holes 306 on the front and rear sides of the air-tight tube 304 with an interference fit. A through hole 308 is opened on the bottom surface of the elastic membrane 307. The size of the through hole 308 is slightly smaller than the size of the covering. Limit strips 309 are fixedly connected to both the front and rear ends of the elastic membrane 307.

[0054] When the covering passes through the air-sealing tube 304, it applies a deformation force to the elastic membrane 307. The perforation 308 enlarges under the action of the deformation force, ensuring that the covering can pass through the perforation 308, while also further narrowing the air passage, resulting in less heat loss.

[0055] Please see Figure 2 , Figure 3 , Figure 4 , Figure 9 , Figure 10 and Figure 11 , Figure 12 , Figure 13 The side-blowing mechanism 4 includes two approach plates 401, which are symmetrically arranged inside the inner square tube 203 of the partition. A telescopic approach rod 402 located at the center of each of the two mutually distant surfaces of the approach plates 401 is fixedly connected to the inner end of the telescopic approach rod 402, which is fixedly connected to the surface of the approach plate 401. One end of the telescopic approach rod 402, away from the approach plate 401, extends to the outside of the square tube outer shell 102, and the other end of the telescopic approach rod 402 is fixedly inserted into the square tube outer shell 102, the inner square tube shell 103, the outer square tube 201 of the partition, and the partition wall. On the side wall of the inner square tube 203, guide telescopic rods 403 are fixedly connected to the four corners of the side of the approach plate 401 that connect to the approach telescopic rod 402. The end of the guide telescopic rod 403 extending inside is fixedly connected to the surface of the approach plate 401, and the other end of the guide telescopic rod 403 is fixedly inserted into the side wall of the inner square tube 203 and the outer square tube 201 of the partition. A rectangular shell 404 is fixedly connected to the right end of both approach plates 401. Multiple air holes 405 are evenly spaced on the left end face of the rectangular shell 404. The air holes 405 are located on the approach plate 401 away from the approach telescopic rod. On one side of the rod 402, a constant pressure hole 406 is provided on the side of the rectangular housing 404 near the telescopic rod 402. An elastic tube 407 is fixedly connected to the side of the rectangular housing 404 near the telescopic rod 402. The elastic tube 407 is connected to the constant pressure hole 406. The end of the elastic tube 407 away from the rectangular housing 404 is fixedly connected to the inner wall of the inner square tube 203 of the partition. Both the front and rear sides of the inner square tube 203 of the partition have a transition hole 414 located at its right end. The transition hole 414 connects the elastic tube 407 to the buffer air chamber 204. The left ends of the two approach plates 401 are fixed. A reinforcing plate 408 is fixedly connected. An elastic compensating tube 409 is fixedly connected to the side of the reinforcing plate 408 facing the inner wall of the inner square tube 203 of the partition. The other end of the elastic compensating tube 409 is fixedly connected to the inner wall of the inner square tube 203 of the partition. Multiple air distribution pipes 410 are installed between the reinforcing plate 408 and the rectangular shell 404. The multiple air distribution pipes 410 correspond one-to-one with multiple air distribution holes 405. The corresponding air distribution pipes 410 and air distribution holes 405 are connected. Multiple air blowing holes 411 are opened on the air distribution pipes 410. The distance between two adjacent air blowing holes 411 gradually decreases from right to left.

[0056] The telescopic rod 402 is connected to the control box 107 for signal transmission.

[0057] The air holes 411 with varying density are used to compensate for the attenuation of airflow pressure inside the air distribution pipe 410, ensuring uniform airflow in each area.

[0058] An outer sleeve 412 is slidably connected to the outside of the air distribution pipe 410. The right end of the outer sleeve 412 is fixedly connected to the left end face of the rectangular shell 404, and the left end of the outer sleeve 412 is fixedly connected to the right end face of the reinforcing plate 408. An air distribution window 413 is opened on the surface of the outer sleeve 412 away from the approach plate 401. The air distribution window 413 is adapted to the air blowing hole 411.

[0059] A first ranging probe 415 is fixedly inserted on both the front and rear sides of the square tube shell 102. One end of the first ranging probe 415 is exposed on the outside of the square tube shell 102, and the other end of the first ranging probe 415 extends into the interior of the inner square tube 203 of the partition and is aligned with the approach plate 401.

[0060] The first ranging probe 415 is connected to the control box 107 for signal transmission. The first ranging probe 415 is used to monitor the position of the approach plate 401, and then control the distance between the two approach plates 401 so that the gap between the two side blowing mechanisms 4 is adapted to the covering.

[0061] The number of air distribution pipes 410 in use is matched with the height of the covering. The higher the covering, the more air distribution pipes 410 are used, and the lower the covering, the fewer air distribution pipes 410 are used. The air distribution pipes 410 near the bottom of the approach plate 401 are used first, and the air distribution pipes 410 higher than the covering are not used. When the air distribution pipes 410 are not used, rotate the air distribution pipes 410. The air distribution pipes 410 rotate with the air blowing holes 411. Then the air blowing holes 411 enter the inner wall of the outer sleeve 412 and are blocked by the inner wall of the outer sleeve 412, so as to achieve the purpose of adjustment according to the height characteristics of the covering.

[0062] Please see Figure 2 , Figure 3 , Figure 4 , Figure 9 , Figure 10 and Figure 14The top-blowing mechanism 5 includes an electric telescopic rod 501, which is fixedly inserted into the center of the top surface of the square tube outer shell 102. The bottom end of the electric telescopic rod 501 extends downward into the interior of the inner square tube 203 of the partition. An approach bar 502 is fixedly connected to the bottom end of the protruding rod inside the electric telescopic rod 501. A linkage plate 503 is fixedly connected to the right end of the approach bar 502. The linkage plate 503 is located on the right side of the side-blowing mechanism 4. A positioning groove 504 is provided on the top surface of the linkage plate 503. A first telescopic tube 505 is fixedly connected to the top surface of the linkage plate 503. The first telescopic tube 505 communicates with the positioning groove 504. The top end of the first telescopic tube 505 is fixedly... A linkage block 506 is fixedly connected to the top surface of the inner cavity of the square tube 203 in the partition and communicates with the air outlet 210. A linkage block 506 is fixedly connected to the left end of the approach bar 502. The linkage block 506 is located on the left side of the side blowing mechanism 4. A second telescopic tube 507 is fixedly connected to the top surface of the linkage block 506. The top end of the second telescopic tube 507 is fixedly connected to the top surface of the inner cavity of the square tube 203 in the partition. Multiple top blowing pipes 508 are installed at equal distances between the linkage plate 503 and the linkage block 506. The right end of the top blowing pipe 508 communicates with the positioning groove 504. Multiple through holes facing directly downward are opened on the surface of the top blowing pipe 508. The distance between two adjacent through holes gradually decreases from the right end to the left end.

[0063] Hot air is blown onto the top surface of the cladding through the through hole.

[0064] A second ranging probe 509 is fixedly inserted into the top surface of the square tube shell 102. The bottom end of the second ranging probe 509 extends downward into the interior of the inner square tube 203 of the partition and points towards the top surface of the strip 502.

[0065] The second ranging probe 509 is connected to the control box 107 for signal transmission. The second ranging probe 509 is used to detect the position of the approach bar 502, and then measure the distance between the approach bar 502 and the top surface of the cover, so as to provide data support for controlling the distance between the approach bar 502 and the cover.

[0066] Multiple cylindrical grooves 510 are evenly spaced on the right side of the linkage block 506, and multiple rectangular grooves 511 are evenly spaced on the left side of the linkage block 506. Each rectangular groove 511 corresponds to one of the cylindrical grooves 510, and the corresponding cylindrical grooves 510 and rectangular grooves 511 are interconnected. The left end of the top blowing pipe 508 is movably inserted into the cylindrical groove 510 and extends into the rectangular groove 511, where it is fixedly connected to a rectangular block 512. The rectangular block 512 is inserted into the rectangular groove 511. A hollow pointed cone 513 is fixedly connected to the right end of the top blowing pipe 508. A vent hole 514 is provided on the hollow pointed cone 513. A limit stop is fixedly connected to the bottom surface of the inner cavity of the positioning groove 504. Multiple insertion holes 516 are equally spaced on the left side of the linkage plate 503 and the limiting stop 515. The insertion holes 516 on the limiting stop 515 correspond to the insertion holes 516 on the left side of the linkage plate 503. The multiple insertion holes 516 on the left side of the linkage plate 503 correspond one-to-one with the multiple cylindrical grooves 510 on the right side of the linkage block 506. The limiting stop 515 divides the positioning groove 504 into left and right chambers. An elastic strip 517 is embedded in the left chamber. The right end of the top blowing pipe 508 passes through the insertion holes 516 on the linkage plate 503, the elastic strip 517, and the insertion holes 516 on the limiting stop 515. The hollow pointed cone 513 is located in the right chamber.

[0067] After the top blowing pipe 508 is pulled out from the elastic strip 517, the elastic strip 517 elastically resets and blocks the insertion hole 516. The number of top blowing pipes 508 used is limited by the width of the covering. The wider the covering, the more top blowing pipes 508 are used, and the narrower the covering, the fewer top blowing pipes 508 are used, so as to achieve the purpose of adjustment according to the width characteristics of the covering.

[0068] The insertion of rectangular block 512 and rectangular slot 511 ensures that the through hole faces downward.

[0069] Working principle

[0070] First, remove the two replacement parts. Then, adjust the side-blowing mechanism 4 through the openings of the square tube 203 inside the frame and partition. During adjustment, rotate the air distribution pipe 410 above the covering until the air hole 411 is blocked by the inner wall of the outer tube 412. Next, determine the number of top-blowing pipes 508 to use based on the width of the covering. Then, pick up one top-blowing pipe 508 and install it into the central cylindrical groove 510. During operation, align the hollow cone 513 with the central rectangular groove 511 and cylindrical groove 510, and then push the top-blowing pipe 508 to the right. Then, the hollow cone 513 and the top-blowing pipe 508... 08 passes through rectangular slot 511, cylindrical slot 510, insertion hole 516, and elastic strip 517. Hollow cone 513 moves to the right chamber until rectangular block 512 is inserted into the corresponding rectangular slot 511. Then, in the same manner, the remaining top blowing pipes 508 are symmetrically installed on the front and rear sides of this top blowing pipe 508 until all top blowing pipes 508 are installed. Then, the replacement body that conforms to the cover is taken out, and then the replacement body is installed on the fixed track 301. Then, the width and height data of the cover are entered in the control panel. Then, the control panel controls the control box 107 according to the width data of the cover. Two approach telescopic rods 402 extend, then the approach telescopic rods 402 drive the approach plate 401 to move towards the center. During this process, the elastic tube 407 and the elastic compensation tube 409 elastically extend. Afterwards, the control box 107 monitors the position of the approach plate 401 in real time through the first ranging probe 415. When the approach plate 401 moves into place, the control box 107 controls the corresponding approach telescopic rod 402 to stop. At this time, the gap between the two side blowing mechanisms 4 matches the width of the covering. Then, the control panel controls the electric telescopic rod 501 to extend according to the height data of the covering through the control box 107. Then the electric telescopic rod 501 extends. The rod 501 moves downwards with the approach bar 502. Then the approach bar 502 moves downwards with the linkage plate 503 and the linkage block 506. The linkage plate 503 pulls the first telescopic tube 505, and the linkage block 506 pulls the second telescopic tube 507. The first telescopic tube 505 and the second telescopic tube 507 are elastically stretched. Then the control box 107 monitors the position of the approach bar 502 in real time through the second ranging probe 509. When the approach bar 502 moves downwards into place, the control box 107 controls the electric telescopic rod 501 to stop. At this time, the top blowing pipe 508 is suspended near the top of the covering part, and the debugging is completed.

[0071] Then, the preheating is started using the control panel. The control panel then controls the operation of the power motor 207 and the vortex heating wire 209 via the control box 107. The power motor 207 drives the impeller 208 to rotate, while the vortex heating wire 209 heats up. The impeller 208 then drives the gas inside the partition inner square tube 203 to enter the return jacket 202 from the return pipe 212 and enter the buffer gas chamber 204 through the circulation hole 206. When the gas passes through the vortex heating wire 209, the vortex heating wire 209 heats the gas and forms a hot airflow. The hot airflow then returns to the partition inner square tube 203 through three paths. The first path is that the hot airflow inside the buffer chamber 204 enters the inner cavity of the inner square tube 203 through the nozzle on the bottom surface of the inner square tube 203 and is blown towards the bottom surface of the covering. The second path is that the hot airflow inside the buffer chamber 204 passes sequentially through the air outlet 210, the first telescopic tube 505, the right chamber inside the positioning groove 504, the vent 514, the inner cavity of the hollow cone 513, the inner cavity of the top blowing tube 508, and the through hole at the bottom of the top blowing tube 508, entering the inner cavity of the inner square tube 203 and being blown towards the top surface of the covering. The third path is that the hot airflow inside the buffer chamber 204 passes sequentially through the transition hole 414 and the elastic tube 40 7. The constant pressure hole 406, the inner cavity of the rectangular shell 404, the air distribution hole 405, the inner cavity of the air distribution pipe 410, and the blowing hole 411 enter the inner cavity of the partition inner square tube 203 and blow air onto the front and rear sides of the covering. Then, as the hot airflow circulates, the vortex heating wire 209 continuously heats the hot airflow. Next, the control box 107 monitors the temperature of the airflow passing through the air outlet 210 and the return pipe 212 through a temperature sensor. When the airflow temperature at the air outlet 210 is lower than the set value, the control box 107 controls the vortex heating wire 209 to increase its power. When the airflow temperature at the air outlet 210 is higher than the set value, the control box 107 controls the vortex heating wire 209 to increase its power. Control box 107 controls the vortex heating wire 209 to reduce power, thereby dynamically balancing the temperature at the air outlet 210. When the airflow temperature at the air outlet 210 reaches the standard but the airflow temperature at the return pipe 212 is lower than the set temperature, control box 107 controls the power motor 207 to accelerate. When the airflow temperature at the air outlet 210 reaches the standard but the airflow temperature at the return pipe 212 is higher than the set temperature, control box 107 controls the power motor 207 to decelerate. This dynamically balances the temperature difference between the two airflows until the airflow temperatures at both locations reach the set temperature range, thus completing the preheating process.

[0072] Then, the control box 107 drives the mesh conveyor belt 106 to rotate via the power mechanism. Next, the shrink film sealing and cutting machine at the front end of the process places the covering parts at equal intervals in the middle position on the top surface of the mesh conveyor belt 106. Then, the mesh conveyor belt 106 moves the covering parts to the right. Then, the two guide plates 305 calibrate the position of the covering parts. Then, the covering parts enter the air-sealing tube 304. Then, the covering parts pass through the perforations 308 one by one. Then, when the front end of the covering part enters the inner square tube 203 of the partition and the rear end is still inside the air-sealing tube 304, the second covering part enters the air-sealing tube 304, so that the air-sealing tube 304 is always blocked by the covering parts to reduce the loss of hot airflow. Then, the covering parts that enter the inner square tube 203 of the partition first are heated and shrunk into finished products. Then, the finished products move out from the air-sealing structure 3 at the right end of the square tube shell 102.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A thermoplastic film packaging machine for fruit juice packaging, comprising a shrink oven, characterized in that, The shrink furnace is equipped with a circulation system inside, which drives the gas inside the shrink furnace to circulate and heat the gas. The circulation system blows hot air from below to the bottom surface of the covering. Both the left and right ends of the shrink furnace are equipped with air-sealing structures. When the covering moves in the air-sealing structures, it blocks part of the air passages. The shrink furnace is equipped with two side blowing mechanisms and one top blowing mechanism inside. The two side blowing mechanisms are located on the front and rear sides of the top blowing mechanism, respectively. The two side blowing mechanisms approach the covering from the front and rear sides and blow hot air onto the front and rear surfaces of the covering. The top blowing mechanism approaches the top surface of the covering from above and blows hot air onto the top surface of the covering. The shrink furnace includes a support shell, a square tube outer shell is fixedly connected to the top surface of the support shell, a square tube inner shell is coaxially inserted inside the square tube outer shell, a circulation system is located inside the square tube inner shell, an outlet box is fixedly installed at both ends of the support shell, a mesh conveyor belt is installed between the two outlet boxes, and the bottom walls of both the square tube outer shell and the square tube inner shell pass through the mesh conveyor belt. The circulation system includes an outer square tube that is coaxially inserted into the inner shell of the square tube. A reflux interlayer is formed between the inner wall of the inner shell and the outer surface of the outer square tube. An inner square tube is coaxially inserted into the outer square tube. A buffer chamber is formed between the outer surface of the inner square tube and the inner wall of the outer square tube. The bottom walls of both the outer and inner square tubes pass through a mesh conveyor belt. A spray hole is opened on the bottom surface of the inner cavity of the inner square tube, and the spray hole communicates with the buffer chamber. Hot air is blown onto the bottom surface of the covering. Both the side-blowing mechanism and the top-blowing mechanism are located inside the inner square tube. Two fixing holes are symmetrically opened on the top surfaces of both the outer and inner shells of the square tube, located at the right end of the outer shell. Two circulation holes are opened on the top surface of the outer square tube, and these two circulation holes are aligned with the two fixing holes on the outer shell. A power motor is fixedly inserted into the two fixing holes on the outer shell of the square tube. The bottom end of the power motor is inserted into the fixing hole on the inner shell of the square tube, and the power motor blocks the fixing hole. An impeller is fixedly sleeved at the bottom end of the output shaft of the power motor. The impeller is located inside the circulation hole. A vortex heating wire is movably sleeved on the outside of the output shaft of the power motor, located above the impeller. The vortex heating wire is bolted to the top surface of the inner square tube of the partition. An air outlet is opened on the top surface of the inner square tube of the partition at its right end. The air outlet connects the inner cavity of the inner square tube of the partition with the buffer air chamber. Positioning holes are opened on the front and rear surfaces of the inner and outer square tubes of the partition at their left ends. The same return pipe is fixedly inserted into the two positioning holes on the same side wall of the outer and inner square tubes of the partition. The return pipe connects the inner cavity of the inner square tube of the partition with the inner cavity of the return interlayer.

2. The thermoplastic film packaging machine for fruit juice packaging according to claim 1, characterized in that, An insulation layer is formed between the inner wall of the square tube shell and the outer surface of the inner shell of the square tube. A power mechanism for driving the mesh conveyor belt to rotate is installed on the lead-out box. A control box is fixedly installed on the right end of the top surface of the square tube shell. The control box is connected to the external control panel for signal transmission and is electrically connected to the power mechanism.

3. A thermoplastic film packaging machine for fruit juice packaging according to claim 2, characterized in that, The outer shell of the square tube, the inner shell of the square tube, the outer square tube of the partition, and the left end of the inner square tube of the partition are fixed to a square frame with bolts. The right ends of the outer shell of the square tube, the inner shell of the square tube, the outer square tube of the partition, and the inner square tube of the partition are fixed to another square frame with bolts. The two square frames are the same size, and the inner wall of the square frame is flush with the inner wall of the inner square tube of the partition.

4. A thermoplastic film packaging machine for fruit juice packaging according to claim 3, characterized in that, The airtight structure includes a fixed track, which is fixedly connected to the surface of the square frame away from the outer shell of the square tube. The inner wall of the square frame is flush with the inner wall of the fixed track. The fixed track is a U-shaped frame with its opening facing downwards. The end face of the fixed track is L-shaped. A snap-fit ​​slide rail is fastened to the outside of the fixed track. The snap-fit ​​slide rail is also a U-shaped frame with its opening facing downwards. An airtight plate is fixedly connected to the inner side wall of the snap-fit ​​slide rail. The airtight plate blocks the opening of the square frame. The bottom end of the airtight plate is suspended above the top surface of the mesh conveyor belt. An airtight tube located in the middle of its bottom end is fixedly inserted into the surface of the airtight plate away from the outer shell of the square tube. The bottom end of the airtight tube is open and adapts to the covering. Two guide plates are fixedly connected to the end face of the airtight tube away from the airtight plate. The two guide plates are symmetrical front and back. The free ends of the two guide plates extend obliquely to the front and rear sides respectively. A diagonal brace is fixedly connected between the top surface of the airtight tube and the surface of the airtight plate away from the outer shell of the square tube.

5. A thermoplastic film packaging machine for fruit juice packaging according to claim 4, characterized in that, The air-tight tube has three mounting holes at equal intervals on both its front and rear side walls. The bottom of each mounting hole is open. The three mounting holes on the front side wall of the air-tight tube correspond one-to-one with the three mounting holes on the rear side wall of the air-tight tube. The same elastic membrane is inserted into the corresponding two mounting holes on the front and rear side walls of the air-tight tube with an interference fit. A perforation is opened on the bottom surface of the elastic membrane. The size of the perforation is slightly smaller than that of the covering. Limit strips are fixedly connected to both the front and rear ends of the elastic membrane.

6. A thermoplastic film packaging machine for fruit juice packaging according to claim 5, characterized in that, The side-blowing mechanism includes two approach plates, symmetrically arranged inside the inner square tube of the partition. A telescopic approach rod is fixedly connected to the center of each of the two approach plates on their two mutually distant surfaces. The end of the telescopic approach rod extending from its interior is fixedly connected to the surface of the approach plate. One end of the telescopic approach rod extends to the outside of the square tube shell, and the other end is fixedly inserted into the side wall of the square tube shell, the inner square tube shell, the outer square tube of the partition, and the inner square tube of the partition. Guide telescopic rods are fixedly connected to the four corners of the sides of the approach plates connected to the telescopic approach rods. The end of the guide telescopic rod extending from its interior is fixedly connected to the surface of the approach plate, and the other end is fixedly inserted into the side wall of the inner and outer square tubes of the partition. A rectangular shell is fixedly connected to the right end of each of the two approach plates. Multiple air distribution holes are equidistantly opened on the left end face of the rectangular shell. The air distribution holes are located at the... The side of the near plate away from the telescopic rod has a constant pressure hole on the side of the rectangular shell near the telescopic rod. An elastic tube is fixedly connected to the side of the rectangular shell near the telescopic rod, and the elastic tube is connected to the constant pressure hole. The end of the elastic tube away from the rectangular shell is fixedly connected to the inner wall of the inner square tube of the partition. Both the front and rear sides of the inner square tube of the partition have a transition hole at its right end, which connects the elastic tube to the buffer air chamber. A reinforcing plate is fixedly connected to the left end of both near plates. An elastic compensation tube is fixedly connected to the side of the reinforcing plate facing the inner wall of the inner square tube of the partition. The other end of the elastic compensation tube is fixedly connected to the inner wall of the inner square tube of the partition. Multiple air distribution pipes are installed between the reinforcing plate and the rectangular shell. Each air distribution pipe corresponds to a multiple air distribution hole. The corresponding air distribution pipes and air distribution holes are connected. Multiple air blowing holes are opened on the air distribution pipes. The distance between two adjacent air blowing holes gradually decreases from right to left.

7. A thermoplastic film packaging machine for fruit juice packaging according to claim 6, characterized in that, The outer sleeve is slidably connected to the outside of the air distribution pipe. The right end of the outer sleeve is fixedly connected to the left end face of the rectangular shell, and the left end of the outer sleeve is fixedly connected to the right end face of the reinforcing plate. An air distribution window is opened on the surface of the outer sleeve away from the approach plate, and the air distribution window is adapted to the air blowing hole.

8. A thermoplastic film packaging machine for fruit juice packaging according to claim 7, characterized in that, The first ranging probe is fixedly inserted into both the front and rear sides of the square tube shell. One end of the first ranging probe is exposed on the outside of the square tube shell, and the other end of the first ranging probe extends into the interior of the square tube inside the partition and is aligned with the approach plate.

9. A thermoplastic film packaging machine for fruit juice packaging according to claim 8, characterized in that, The top-blowing mechanism includes an electric telescopic rod, which is fixedly inserted into the center of the top surface of the square tube shell. The bottom end of the electric telescopic rod extends downward into the interior of the inner square tube of the partition. An approach bar is fixedly connected to the bottom end of the protruding rod inside the electric telescopic rod. A linkage plate is fixedly connected to the right end of the approach bar. The linkage plate is located on the right side of the side-blowing mechanism. A positioning groove is opened on the top surface of the linkage plate. A first telescopic tube is fixedly connected to the top surface of the linkage plate. The first telescopic tube communicates with the positioning groove. The top end of the first telescopic tube is fixedly connected to the top surface of the inner cavity of the inner square tube of the partition and communicates with the air outlet. A linkage block is fixedly connected to the left end of the approach bar. The linkage block is located on the left side of the side-blowing mechanism. A second telescopic tube is fixedly connected to the top surface of the linkage block. The top end of the second telescopic tube is fixedly connected to the top surface of the inner cavity of the inner square tube of the partition. Multiple top-blowing tubes are installed at equal intervals between the linkage plate and the linkage block. The right end of the top-blowing tube communicates with the positioning groove. Multiple through holes facing directly downward are opened on the surface of the top-blowing tube. The distance between two adjacent through holes gradually decreases from the right end to the left end. A second ranging probe is fixedly inserted into the top surface of the square tube shell. The bottom end of the second ranging probe extends downward into the interior of the square tube inside the partition and points towards the top surface of the approach strip.

10. A thermoplastic film packaging machine for fruit juice packaging according to claim 9, characterized in that, The right side of the linkage block has multiple cylindrical slots at equal intervals, and the left side of the linkage block has multiple rectangular slots at equal intervals. The rectangular slots correspond one-to-one with the cylindrical slots, and the corresponding cylindrical and rectangular slots are interconnected. The left end of the top blowing pipe is movably inserted into the cylindrical slot and extends into the rectangular slot, where it is fixedly connected to a rectangular block. The rectangular block is inserted into the rectangular slot. The right end of the top blowing pipe is fixedly connected to a hollow cone with a vent hole. A limit stop is fixedly connected to the bottom surface of the positioning groove cavity. Multiple insertion holes are equally spaced on the left side of the linkage plate and on the limit stop. The insertion holes on the limit stop correspond to the insertion holes on the left side of the linkage plate. The multiple insertion holes on the left side of the linkage plate correspond one-to-one with the multiple cylindrical slots on the right side of the linkage block. The limit stop divides the positioning groove into left and right chambers. An elastic strip is embedded in the left chamber. The right end of the top blowing pipe passes through the insertion holes on the linkage plate, the elastic strip, and the insertion holes on the limit stop. The hollow cone is located in the right chamber.

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