A thermoforming method for a plastic packaging box

Abstract

The present invention relates to the technical field of plastic packaging box thermoforming, and specifically relates to a method for thermoforming a plastic packaging box, including a limiting unit and a palletizing unit. According to the size of the concave packaging, the present invention changes the limiting and guiding size of the limiting member through an adjusting member, guides the concave packaging through the limiting member, and extrudes the concave packaging through an extruding member to ensure that the concave packagings are closely attached to each other, preventing them from dispersing during subsequent movement. As the thickness of the palletized concave packaging increases, the distance control member is driven to move through a linkage member, thereby changing the height of the moving member and enabling the height of the extruding member to adapt to the palletized concave packaging. During the entire palletizing process, only manual labor is required to take out the palletized concave packaging at the end, without the need for manual participation throughout the day, thus ensuring that the thermoformed packaging box can operate throughout the day and improving the processing efficiency of the thermoformed packaging box.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic packaging box thermoforming, and specifically provides a method for thermoforming plastic packaging boxes. Background Art

[0002] Concave packaging is used for food packaging, electronic products, toys, stationery, daily necessities, hardware parts, gifts, medicine, and cosmetics. It is mainly processed by the thermoforming process. The thermoforming process mainly includes: mold making and processing, drying and softening of the mold. After the mold is completely dried, the mold is installed on the upper iron plate of the vacuum chamber. Then, the plastic sheet is placed in a heating wooden cabinet to fix it completely. Next, the wooden cabinet together with the plastic sheet is placed on a constant temperature furnace for softening treatment. Finally, the softened plastic sheet together with the wooden cabinet is placed in the vacuum chamber, and the air suction switch is turned on to suck out all the air in the vacuum chamber. After the plastic sheet cools down, a concave packaging identical to the mold is obtained. Subsequently, the concave packaging is cut and stacked.

[0003] The existing concave packaging forming production line in large factories is fully automatic. However, due to the high cost of the fully automatic production line device, the concave packaging in small factories is only automated during the formation of the concave packaging and trimming, and then the blanking table is flipped, and the concave packaging falls from the blanking table. Subsequently, the formed concave packaging needs to be manually sorted, stacked, and palletized, and then transferred to a cutting machine to be cut into individual packaging boxes. After manual stacking, the total cost is reduced, but full-day stacking and palletizing operations cannot be carried out, thus affecting the production efficiency of the concave packaging. Moreover, during manual stacking, when encountering small-sized concave packaging, two concave packagings can be quickly stacked closely. However, when encountering large-sized concave packaging, it is difficult to quickly stack two concave packagings closely. Also, the speed of forming the concave packaging is relatively fast, which results in that manual stacking is extremely likely to have a stacking speed far behind the forming speed, or when stacking, the adjacent concave packagings cannot be stacked closely. As a result, under the same stacking height of the same thickness, the number of concave packagings that cannot be stacked closely is small, and the concave packagings are scattered during the transfer process, thus increasing the subsequent remedial processing procedures. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present application provide a method for thermoforming plastic packaging boxes to solve the technical problems in the related art that manual work cannot operate all day long and it is difficult for concave packagings to be completely stacked closely when manually stacking large-sized concave packagings. To achieve the above purpose, the embodiments of the present application provide the following technical solutions.

[0005] A method for thermoforming plastic packaging boxes according to the embodiments of the present application includes the following steps: S1. Thermoforming: Put the plastic raw material into the mold, and through the action of heating and pressure, melt the plastic and fill the mold to form the shape of the concave packaging.

[0006] S2. Forming and palletizing: After trimming the concave packages, send them to the flow table and then palletize them.

[0007] S3, transfer and cutting: transfer the stacked concave packages, and then use a cutting tool to cut the concave packages.

[0008] S4. Palletizing and packaging: The cut individual packaging boxes are then palletized and packaged for transportation.

[0009] ‌Wherein, step S2 is completed by using a palletizing device, the palletizing device includes a limiting unit and a palletizing unit, the palletizing unit is arranged on the limiting unit for pressing and palletizing between concave packages, the limiting unit is used in conjunction with the blanking table of the existing blister forming device, the limiting unit includes a horizontal platform, a limiting member is arranged on the horizontal platform, and an adjusting member is evenly arranged on the limiting member; the palletizing unit includes a rectangular groove, the horizontal platform is symmetrically provided with rectangular grooves, a bidirectional screw rod is rotatably connected in the rectangular groove, a moving member is symmetrically threadedly connected to the bidirectional screw rod front and back, a sprocket wheel is fixedly installed at the front end of the bidirectional screw rod, the left and right sprocket wheels are connected by a toothed chain belt, an extrusion member is arranged on the moving member, a control member for controlling the rotation of the extrusion member is arranged on the moving member, the control member is fixedly connected to the extrusion member, a distance control member is arranged between the corresponding moving members on the left and right, the distance control member adjusts the height of the moving member, and a linkage member is arranged between the distance control members.

[0010] According to an embodiment of the present invention, the limit member includes a bending group, which is symmetrically fixedly installed on the upper end of the horizontal platform, and the bending group is composed of an inverted bending plate 1 that is symmetrically arranged front to back, and two connecting rods are fixedly installed between the front and rear two bending plates 1, and the connecting rods are arranged up and down, and four bending plates 2 are inserted through the connecting rods on the upper and lower sides for sliding forward and backward. The two bending plates 2 are symmetrically arranged front to back, and circular stops are symmetrically fixedly installed on the upper connecting rod. In an initial state, the circular stops are tightly attached to the two bending plates 2 in the middle, and a socket 1 is provided on the upper connecting rod and on one side of the two bending plates 2 in the middle away from the circular stops, and a socket 2 is symmetrically provided on the upper connecting rod and on the front and rear sides of the other two bending plates 2, and plug posts are inserted in the sockets 1 and 2.

[0011] According to an embodiment of the present invention, a magnetic plate is fixedly installed on the upper middle end of the horizontal platform, a magnetic positioning block is evenly magnetically attracted to the upper end of the magnetic plate, grid-shaped scale lines are arranged on the magnetic plate, and a blocking plate is fixedly installed on the front side of the upper end of the horizontal platform.

[0012] According to an embodiment of the present invention, the adjustment member includes a limit groove, a limit groove is opened in the middle part of the second bending plate, a bent adjustment plate is connected in the limit groove for sliding left and right, a threaded rod is threadedly connected on the second bending plate, the end of the threaded rod is rotatably connected to the adjustment plate, and a guide rod is fixedly installed on the adjustment plate for sliding left and right and penetrating the second bending plate.

[0013] According to an embodiment of the present invention, the moving part includes a moving column 1, a bidirectional screw rod 1 symmetrically threadedly connected to a rectangular moving column 1, a compensation column slidably connected to the upper end of the moving column 1, a moving column 2 slidably connected to the upper end of the compensation column, and connecting springs are fixedly connected between the moving column 2 and the compensation column and between the moving column 1 and the compensation column.

[0014] According to an embodiment of the present invention, the extrusion member includes a rotating column, the upper end of the movable column is rotatably connected to the rotating column through a pin shaft, a torsion spring is sleeved on the pin shaft, one end of the torsion spring is fixedly connected to the rotating column, and the other end of the torsion spring is fixedly connected to the movable column. In the initial state, the torsion spring makes the rotating column move away from the center of the horizontal platform and maintain a horizontal state. Two distance control cylinders are fixedly installed on the upper end of the rotating column, and the two distance control cylinders are arranged on the left and right. A cylindrical spring is fixedly installed on the telescopic end of the distance control cylinder, and an extrusion block is fixedly installed on the end of the cylindrical spring.

[0015] According to an embodiment of the present invention, the control component includes a limit plate, a limit plate is fixedly installed at one end of the movable column 2 toward the center of the horizontal platform, a winding column is rotatably connected to the middle part of the movable column 1, and a retractable linkage rod is fixedly connected between the winding columns on the front and rear sides, the linkage rod cannot rotate relative to the winding column, and the vertical height of the winding column is lower than the height of the lower connecting rod, and a traction wire rope 1 wound on the winding column is fixedly connected to the winding column, and the winding directions of the traction wire rope 1 on the winding columns on the left and right sides are opposite, and the end of the traction wire rope 1 slides up and down to pass through the compensation column and the limit plate, and is finally fixedly connected to the rotating column, and the winding columns on the front and rear sides are fixedly connected, and a sprocket wheel 5 is fixedly installed at the front end of the front winding column, and the sprocket wheels 5 are connected through a toothed chain belt 3 transmission connection.

[0016] According to an embodiment of the present invention, the distance control member includes a distance control rod, and the distance control rod is connected to the left and right corresponding moving columns one for common rotation. The distance control rod and the moving column one are fixedly connected with a traction wire rope two wound around the distance control rod. The traction wire rope two slides up and down through the compensation column and is finally fixedly connected to the moving column two.

[0017] According to an embodiment of the present invention, the linkage member includes a second sprocket. The right ends of the distance control rods are fixedly connected with the second sprockets. The right end of the horizontal platform is rotatably connected with third sprockets symmetrically before and after. The middle of the right end of the horizontal platform is fixedly installed with a fixing plate. The middle of the fixing plate is rotatably connected with a second bidirectional screw rod. The second bidirectional screw rod is threadedly connected with rectangular blocks symmetrically up and down. The middle of the fixing plate is rotatably connected with a limiting rod that slidably penetrates through the rectangular blocks up and down. The left ends of the rectangular blocks are rotatably connected with tension wheels symmetrically up and down. In the initial state, the second sprockets, the third sprockets, the uppermost tension wheel, and the lowermost tension wheel are commonly connected by a second toothed chain belt for transmission.

[0018] According to an embodiment of the present invention, the linkage rod includes a fixed round rod. Fixed round rods are fixedly connected between the corresponding winding columns before and after. A moving round rod is slidably connected between the fixed round rods commonly before and after. A fixed spring is fixedly connected between the moving round rod and the fixed round rod.

[0019] From the above technical solutions, it can be seen that the present invention has the following advantages:

[0020] 1. In the present invention, according to the size of the concave package, the limiting and guiding size of the limiting member is changed through the adjusting member. The concave package is guided through the limiting member, and the concave package is extruded through the extruding member to ensure that the concave packages are closely attached to each other, preventing them from being scattered during subsequent movement. As the thickness of the stacked concave packages increases, the distance control member is driven by the linkage member to move, thereby changing the height of the moving member and making the height of the extruding member adapt to the stacked concave packages. During the entire stacking process, only manual labor is required to take out the stacked concave packages at the end, and there is no need for manual participation throughout the day, thereby ensuring that the plastic suction packaging box can operate throughout the day and improving the processing efficiency of the plastic suction packaging box.

[0021] 2. In the present invention, according to the size of the concave package stacked each time, the number and position of the positioning blocks are adjusted. Through the scale lines, it is convenient to adjust the positioning blocks. By rotating the threaded rod, under the guidance of the guiding rod, the horizontal displacement of the adjusting plate is changed to adapt to the width size of the concave package.

[0022] 3. In the present invention, by rotating the second bidirectional screw rod, the distance between the rectangular blocks is changed, thereby adjusting whether the second sprocket contacts the second toothed chain belt, so as to achieve the purpose of cooperatively driving the distance control rod to rotate synchronously or smoothly taking out the completely stacked concave packages.

[0023] In addition to the technical problems solved by the embodiments of the present application described above, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions, other technical problems that can be solved by the plastic packaging box thermoforming method provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0025] Figure 1 Shows the working flow chart of the present invention.

[0026] Figure 2 Shows the front view three-dimensional structural schematic diagram of the palletizing device.

[0027] Figure 3 Shows Figure 2 The partial enlarged view at position N of

[0028] Figure 4 Shows the front view three-dimensional structural schematic diagram of the limiting member and the adjusting member.

[0029] Figure 5 Shows the front view three-dimensional structural schematic diagram of the moving member, the pressing member, the control member and the linkage member.

[0030] Figure 6 Shows the sectional plane structural schematic diagram of the connecting spring and the traction steel wire rope two.

[0031] Figure 7 Shows Figure 6 The partial enlarged view at position M of

[0032] Figure 8 Shows the top view sectional plane structural schematic diagram of the fixed round rod and the moving round rod.

[0033] Figure 9 Shows the right view plane structural schematic diagram of the linkage member.

[0034] Figure 10 Shows the structural schematic diagram of the concave packaging.

[0035] Among them, the above-mentioned drawings include the following reference numerals:

[0036] 1. Limiting unit; 11. Horizontal platform; 111. Magnetic suction plate; 112. Positioning block; 113. Baffle plate; 12. Limiting member; 121. First bent plate; 122. Connecting rod; 123. Second bent plate; 124. Circular stop block; 125. First jack; 126. Second jack; 127. Insertion post; 13. Adjusting member; 131. Limiting groove; 132. Adjusting plate; 133. Threaded rod; 134. Guide rod; 2. Palletizing unit; 21. Rectangular groove; 22. First bidirectional screw; 23. Moving member; 231. First moving column; 232. Compensation column; 233. Second moving column; 234. Connecting spring; 24. First sprocket; 25. First toothed chain belt; 26. Extrusion member; 261. Rotating column; 262. Torsion spring; 263. Distance control cylinder; 264. Cylindrical spring; 265. Extrusion block; 27. Control member; 271. Limit plate; 272. Winding column; 273. Linking rod; 2721. Fixed round rod; 2722. Movable round rod; 2723. Fixed spring; 274. First traction steel wire rope; 275. Fifth sprocket; 276. Third toothed chain belt; 28. Distance control member; 281. Distance control rod; 282. Second traction steel wire rope; 29. Linking member; 291. Second sprocket; 292. Third sprocket; 293. Fixed plate; 294. Second bidirectional screw; 295. Rectangular block; 296. Tensioning wheel; 297. Second toothed chain belt; 298. Limit rod. Detailed implementation manners

[0037] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0038] Refer to Figure 1 With Figure 10 , a plastic packaging box thermoforming method, comprising the following steps: S1. Thermoforming: Put plastic raw materials into a mold, and through the action of heating and pressure, melt the plastic and fill the mold to form the shape of a concave package.

[0039] S2. Forming and palletizing: After trimming the concave package, send it to a conveyor table, and then palletize the concave package.

[0040] S3. Transferring and cutting: Transfer the palletized concave package, and then use a cutting tool to cut the concave package so that the large concave package is cut into individual independent concave packaging boxes.

[0041] S4. Palletizing and packaging: Then palletize the cut individual packaging boxes and perform packaging and transportation on them.

[0042] ‌See Figure 2 , wherein step S2 is completed by using a palletizing device, the palletizing device includes a limiting unit 1 and a palletizing unit 2, the palletizing unit 2 is arranged on the limiting unit 1 for pressing and palletizing between concave packages, the limiting unit 1 is used in conjunction with the blanking table of the existing blister forming device, the limiting unit 1 includes a horizontal platform 11, a limiting member 12 is arranged on the horizontal platform 11, and an adjusting member 13 is evenly arranged on the limiting member 12; the palletizing unit 2 includes a rectangular groove 21, the horizontal platform 11 is symmetrically provided with rectangular grooves 21, and the rectangular grooves 21 are rotatably connected with double The bidirectional screw 22 and the bidirectional screw 22 are symmetrically threadedly connected with a moving part 23, and a sprocket 24 is fixedly installed at the front end of the bidirectional screw 22. The left and right sprockets 24 are connected by a toothed chain belt 25. An extrusion part 26 is arranged on the moving part 23, and a control part 27 for controlling the rotation of the extrusion part 26 is arranged on the moving part 23. The control part 27 is fixedly connected to the extrusion part 26. A distance control part 28 is commonly arranged between the corresponding moving parts 23 on the left and right, and the distance control part 28 adjusts the height of the moving part 23. A linkage part 29 is commonly arranged between the distance control parts 28.

[0043] According to the size of the concave package, the limiting guide size of the limiting member 12 is changed by the adjusting member 13, and the concave package formed by blistering falls downward in the form of a large piece, such as Figure 10 As shown, each sheet includes a plurality of concave packaging boxes, the concave packaging is guided by the limit member 12, and the control member 27 is driven by the external motor to move, thereby driving the extrusion member 26 to rotate 180° toward the center of the horizontal platform 11 to extrude the concave packaging, and then the control member 27 is driven by the external motor to move, driving the extrusion member 26 to rotate 180° toward the side away from the center of the horizontal platform 11, and the next concave packaging continues to fall downward, and the external motor continues to drive the control member 27 to move, thereby driving the extrusion member 26 to rotate 180° toward the center of the horizontal platform 11 to extrude the next concave packaging. Press, and then repeat the operation. As the thickness of the stacked concave packages increases, the distance control member 28 is driven to move through the linkage member 29, thereby changing the height of the movable member 23, so that the height of the extrusion member 26 adapts to the gradually increasing concave packages, and then continue to repeat the operation of blanking and extruding until the thickness of the stacked concave packages on the horizontal platform 11 reaches the requirement, and the limit member 12 is manually adjusted to no longer limit the left and right sides of the concave packages. At the same time, the bidirectional screw 22 is driven to rotate by an external motor to drive the movable member 23 to move in opposite directions to prevent it from interfering with the removal of the concave packages, and then the stacked concave packages are taken out.

[0044] See also Figure 2 and Figure 4The limiting member 12 includes a bending group, and a bending group is fixedly installed symmetrically on the upper end of the horizontal platform 11. The bending group is composed of an inverted 亂-shaped bending plate 121 arranged symmetrically front and back. Two connecting rods 122 are fixedly installed between the front and rear two bending plates 121. The connecting rods 122 are arranged up and down, and four bending plates 123 are inserted through the connecting rods 122 on the upper and lower sides. A circular stopper 124 is fixedly installed symmetrically front and back on the upper connecting rod 122. In the initial state, the circular stopper 124 is tightly attached to the two bending plates 123 in the middle, and the upper connecting rod 122 A socket 125 is provided on one side of the two middle bending plates 123 away from the circular stopper 124, and a socket 126 is symmetrically provided on the upper connecting rod 122 and on the front and rear sides of the other two bending plates 123, and plug posts 127 are inserted into the sockets 125 and 126. The circular stopper 124 limits the opposite ends of the two middle bending plates 123, and when it is necessary to take out the stacked concave packages, the plug posts 127 are taken out, and the bending plate 123 is manually moved toward the bending plate 121 to prevent the bending plate 123 from interfering with the removal of the stacked concave packages.

[0045] See also Figure 2 and Figure 10 A magnetic plate 111 is fixedly installed on the upper middle end of the horizontal platform 11, and a magnetic positioning block 112 is uniformly magnetically attracted on the upper end of the magnetic plate 111. A grid-shaped scale line (not shown in the figure) is set on the magnetic plate 111. A blocking plate 113 is fixedly installed on the front side of the upper end of the horizontal platform 11. The bottom size of the regular prism-shaped positioning block 112 is larger than the size of the packaging box; the front end of the concave package is limited and blocked by the blocking plate 113, and the concave package is positioned by the positioning block 112 being close to the concave package, and the concave package at the lower side will not directly contact the horizontal platform 11 under the restriction of the positioning block 112, so as to facilitate the removal of the concave package after palletizing, and the number and position of the positioning block 112 are adjusted according to the size of the concave package to be palletized each time, and the positioning block 112 is quickly positioned through the scale line.

[0046] See also Figure 4 The adjusting member 13 includes a limiting groove 131, a limiting groove 131 is provided in the middle of the second bending plate 123, a bent adjusting plate 132 is slidably connected to the limiting groove 131, a threaded rod 133 is threadedly connected to the second bending plate 123, the end of the threaded rod 133 is rotatably connected to the adjusting plate 132, and a guide rod 134 is fixedly installed on the adjusting plate 132 and slides left and right through the second bending plate 123; by rotating the threaded rod 133, under the guidance of the guide rod 134, the horizontal displacement of the adjusting plate 132 is changed to adapt to the width size of the concave packaging.

[0047] See also Figure 5 , Figure 6and Figure 7 The moving member 23 includes a first moving column 231. The first bidirectional screw rod 22 is symmetrically and threadedly connected with the rectangular first moving column 231 before and after. A compensation column 232 is slidably connected to the upper end of the first moving column 231 in the vertical direction. A second moving column 233 is slidably connected to the upper end of the compensation column 232 in the vertical direction. Connecting springs 234 are fixedly connected between the second moving column 233 and the compensation column 232, and between the first moving column 231 and the compensation column 232.

[0048] Refer to Figure 5 and Figure 6 The squeezing member 26 includes a rotating column 261. The upper end of the second moving column 233 is rotatably connected to the rotating column 261 through a pin shaft. A torsion spring 262 is sleeved on the pin shaft. One end of the torsion spring 262 is fixedly connected to the rotating column 261, and the other end of the torsion spring 262 is fixedly connected to the second moving column 233. In the initial state, the torsion spring 262 keeps the rotating column 261 away from the center of the horizontal platform 11 and in a horizontal state. Two distance control cylinders 263 are fixedly installed at the upper end of the rotating column 261. The two distance control cylinders 263 are arranged left and right. A cylindrical spring 264 is fixedly installed at the telescopic end of the distance control cylinder 263. An extrusion block 265 is fixedly installed at the end of the cylindrical spring 264. When the control member 27 pulls the rotating column 261 to rotate 180° toward the center of the horizontal platform 11, the distance control cylinder 263 drives the cylindrical spring 264 and the extrusion block 265 to move downward to squeeze the concave package, ensuring that adjacent concave packages are closely attached to each other, thereby preventing the stacked concave packages from becoming loose during the movement. Moreover, the stacking height of the closely attached concave packages is less than the stacking height of the not fully attached concave packages. When the rotating column 261 is no longer pulled by the control member 27, the torsion spring 262 drives the rotating column 261 to rotate back to the initial state.

[0049] Continue to refer to Figure 5 and Figure 6The control member 27 includes a limit plate 271, a limit plate 271 is fixedly installed at one end of the movable column 233 toward the center of the horizontal platform 11, a winding column 272 is rotatably connected to the middle of the movable column 231, and a retractable linkage rod 273 is fixedly connected between the winding columns 272 on the front and rear sides, and the linkage rod 273 cannot rotate relative to the winding column 272. The vertical height of the winding column 272 is lower than the height of the lower connecting rod 122 to avoid obstruction when taking out the concave package. A traction wire rope 274 wound around the winding column 272 is fixedly connected to the winding column 272, and the traction wire rope 274 on the winding columns 272 on the left and right sides is fixedly connected to the winding column 272. The winding direction of the wire rope 274 is opposite, and the end of the traction wire rope 274 slides up and down to pass through the compensation column 232 and the limit plate 271, and is finally fixedly connected to the rotating column 261. The winding columns 272 on the front and rear sides are fixedly connected, and a sprocket five 275 is fixedly installed at the front end of the front winding column 272, and the sprocket five 275 are connected by a toothed chain belt three 276. The sprocket five 275 on the right side is driven to rotate by an external motor, and with the cooperation of the toothed chain belt three 276 and the linkage rod 273, all the winding columns 272 rotate together, thereby winding the traction wire rope 274 and pulling the rotating column 261 to rotate.

[0050] See also Figure 6 and Figure 7 The distance control member 28 includes a distance control rod 281, and the distance control rod 281 is connected to the corresponding movable columns 231 on the left and right sides. A traction wire rope 282 wound around the distance control rod 281 is fixedly connected on the distance control rod 281 and located inside the movable column 231. The traction wire rope 282 slides up and down and passes through the compensation column 232, and is finally fixedly connected to the movable column 233; the distance control rods 281 on the front and rear sides are driven to rotate through the linkage member 29, so as to relax the traction wire rope 282, and the distance between the movable column 231 and the movable column 233 is increased under the reaction force of the connecting spring 234.

[0051] See also Figure 2 , Figure 3 , Figure 5 and Figure 9, the linkage member 29 includes a second sprocket 291. A second sprocket 291 is fixedly connected to the right end of each of the distance control rods 281. A third sprocket 292 is rotatably connected to the front and rear of the right end of the horizontal platform 11 symmetrically. A fixing plate 293 is fixedly installed in the middle of the right end of the horizontal platform 11. A second bidirectional screw 294 is rotatably connected to the middle of the fixing plate 293. A rectangular block 295 is threadedly connected to the second bidirectional screw 294 symmetrically up and down. A limiting rod 298 that slides up and down through the rectangular block 295 is rotatably connected to the middle of the fixing plate 293. Tension wheels 296 are rotatably connected to the left end of the rectangular block 295 symmetrically up and down. In the initial state, the second sprocket 291, the third sprocket 292, the uppermost tension wheel 296, and the lowermost tension wheel 296 are jointly connected by a second toothed chain belt 297 for transmission; by rotating the second bidirectional screw 294 to change the distance between the rectangular blocks 295, when it is necessary to drive the distance control rods 281 to rotate synchronously, the second bidirectional screw 294 drives the rectangular blocks 295 to move towards each other, so that the second toothed chain belt 297 meshes with the second sprocket 291 for transmission. When it is necessary to take out the completely palletized concave packaging, rotate the second bidirectional screw 294 to increase the distance between the rectangular blocks 295, so that there is no contact between the second sprocket 291 and the second toothed chain belt 297. At the same time, take out the insertion post 127, and manually move the second bending plate 123 towards the first bending plate 121 to prevent the second bending plate 123 from interfering with the taking out of the palletized concave packaging.

[0052] Refer to Figure 8 , the linkage rod 273 includes a fixed round rod 2721. A fixed round rod 2721 is fixedly connected between the corresponding winding columns 272 before and after. A moving round rod 2722 is slidably connected between the fixed round rods 2721 jointly before and after. A fixed spring 2723 is fixedly connected between the moving round rod 2722 and the fixed round rod 2721.

[0053] The front and rear distance control rods 281 are driven to rotate by the linkage member 29, so as to relax the second traction steel wire rope 282. Under the reaction force of the connecting spring 234, the distance between the first moving column 231 and the second moving column 233 is increased.

[0054] Working principle: According to the size of the concave packaging box, adjust the number and position of the positioning blocks 112. Through the scale lines, it is convenient for the positioning blocks 112 to be quickly positioned. By rotating the threaded rod 133, under the guidance of the guide rod 134, the horizontal displacement of the adjusting plate 132 is changed to adapt to the width size of the concave packaging. The front end of the concave packaging is limited and blocked by the blocking plate 113. The suction-molded concave packaging drops downward in the form of a large sheet, and each sheet includes a plurality of concave packaging boxes. The concave packaging is positioned by being closely attached to the positioning blocks 112. And the lowermost concave packaging is restricted by the positioning blocks 112 and will not directly contact the horizontal platform 11, so as to facilitate the taking out of the palletized concave packaging.

[0055] The external motor drives the sprocket five 275 on the right side to rotate. With the cooperation of the tooth chain belt three 276 and the linkage rod 273, all the winding columns 272 rotate together, thereby winding the traction steel wire rope one 274. After pulling the rotating column 261 to rotate 180° towards the center side of the horizontal platform 11, the control distance cylinder 263 drives the cylindrical spring 264 and the extrusion block 265 to move downward, squeezing the concave-shaped packages to ensure that adjacent concave-shaped packages are closely attached to each other, thereby preventing the stacked concave-shaped packages from becoming loose during movement. Then, the external motor drives the sprocket five 275 on the right side to rotate in the reverse direction. When the rotating column 261 is no longer pulled by the winding column 272, the torsion spring 262 drives the rotating column 261 to rotate back to the initial state. Then, the next concave-shaped package continues to fall downward, and the external motor continues to drive the sprocket five 275 to rotate, causing the rotating column 261 to flip downward again, and the extrusion block 265 to move downward to squeeze the next concave-shaped package, and then the operation is repeated.

[0056] As the thickness of the stacked concave-shaped packages increases, the distance between the rectangular blocks 295 is changed by rotating the two-way screw rod two 294. When it is necessary to drive the control distance rod 281 to rotate synchronously, the two-way screw rod two 294 drives the rectangular blocks 295 to move towards each other, causing the tooth chain belt two 297 to mesh and drive with the sprocket two 291. When it is necessary to take out the completely stacked concave-shaped packages, rotate the two-way screw rod two 294 to increase the distance between the rectangular blocks 295, so that the sprocket two 291 and the tooth chain belt two 297 are not in contact. At the same time, take out the insertion post 127, and manually move the bending plate two 123 towards the bending plate one 121 to prevent the bending plate two 123 from interfering with the taking out of the stacked concave-shaped packages. The control distance rods 281 on the front and back sides are driven to rotate through the linkage member 29, thereby relaxing the traction steel wire rope two 282. Under the reaction force of the connecting spring 234, the distance between the moving column one 231 and the moving column two 233 is increased, so that the height of the extrusion member 26 adapts to the gradually increasing concave-shaped packages. Then, continue to repeat the operation of feeding and squeezing until the thickness of the concave-shaped packages stacked on the horizontal platform 11 reaches the requirement. Manually adjust the limiting member 12 to no longer limit the left and right sides of the concave-shaped packages. At the same time, drive the two-way screw rod one 22 by the external motor to drive the moving member 23 to move away from each other to prevent it from interfering with the taking out of the concave-shaped packages, and then take out the stacked concave-shaped packages.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "middle part", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "end", "axial direction", "circumferential direction", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0058] In addition, the terms "first", "second", "No. 1", "No. 2", "one", and "two" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0059] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, a sliding connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A thermoforming method for a plastic packaging box, characterized in that , including the following steps: S1. Blister molding: The plastic raw material is fed into the mold. After heating and pressurization, the plastic melts and fills the mold to form a concave packaging shape; S2, forming and palletizing: after trimming the concave packages, send them to the flow table, and then palletize the concave packages; S3, transfer and cutting: transfer the palletized concave packages and cut them with a cutting tool; S4. Palletizing and packaging: Palletizing the cut individual packaging boxes and packaging them for transportation; ‌Wherein, step S2 is completed by using a palletizing device, the palletizing device includes a limiting unit and a palletizing unit, the palletizing unit is arranged on the limiting unit for pressing and palletizing concave packages, the limiting unit is used in conjunction with a blanking table of an existing blister forming device, the limiting unit includes a horizontal platform, a limiting member is arranged on the horizontal platform, and adjustment members are evenly arranged on the limiting member; The stacking unit comprises a rectangular groove, which is symmetrically provided on the horizontal platform, in which a bidirectional screw is rotatably connected, and a moving part is symmetrically threadedly connected to the bidirectional screw, and a sprocket is fixedly installed at the front end of the bidirectional screw, and the left and right sprockets are connected by a toothed chain belt for transmission, an extrusion part is arranged on the moving part, and a control part for controlling the rotation of the extrusion part is arranged on the moving part, and the control part is fixedly connected to the extrusion part, and a distance control part is commonly provided between the corresponding moving parts on the left and right, and the distance control part adjusts the height of the moving part, and a linkage part is commonly provided between the distance control parts.

2. A thermoforming method for a plastic packaging box according to claim 1, characterized in that: The limiting member includes a bending group, which is symmetrically fixedly installed on the upper end of the horizontal platform, and the bending group is composed of an inverted bending plate 1 that is symmetrically arranged front to back, and two connecting rods are fixedly installed between the front and rear two bending plates 1, and the connecting rods are arranged up and down, and four bending plates 2 are inserted through the connecting rods on the upper and lower sides for sliding forward and backward. The two bending plates 2 are symmetrically arranged front to back, and circular blocks are symmetrically fixedly installed on the upper connecting rod. In the initial state, the circular blocks are tightly attached to the two bending plates 2 in the middle, and a socket 1 is provided on the upper connecting rod and on the side of the two bending plates 2 in the middle away from the circular block, and a socket 2 is symmetrically provided on the upper connecting rod and on the front and rear sides of the remaining two bending plates 2, and plug posts are inserted in the sockets 1 and 2.

3. A thermoforming method for a plastic packaging box according to claim 1, characterized in that: A magnetic plate is fixedly installed on the upper middle end of the horizontal platform, a magnetic positioning block is evenly magnetically attracted to the upper end of the magnetic plate, a grid-shaped scale line is arranged on the magnetic plate, and a blocking plate is fixedly installed on the front side of the upper end of the horizontal platform.

4. A thermoforming method for a plastic packaging box according to claim 2, characterized in that: The adjustment member includes a limit groove, a limit groove is provided in the middle of the second bending plate, a bent adjustment plate is connected in the limit groove for sliding left and right, a threaded rod is threadedly connected on the second bending plate, the end of the threaded rod is rotationally connected to the adjustment plate, and a guide rod is fixedly installed on the adjustment plate for sliding left and right and penetrating the second bending plate.

5. A thermoforming method for a plastic packaging box according to claim 1, characterized in that: The moving part includes a moving column 1, a bidirectional screw rod 1 symmetrically threadedly connected to a rectangular moving column 1, a compensation column slidably connected to the upper end of the moving column 1, a moving column 2 slidably connected to the upper end of the compensation column, and a connecting spring fixedly connected between the moving column 2 and the compensation column and between the moving column 1 and the compensation column.

6. A thermoforming method for a plastic packaging box according to claim 5, characterized in that: The extrusion part includes a rotating column, and the upper end of the second moving column is rotatably connected to the rotating column through a pin shaft, and a torsion spring is sleeved on the pin shaft. One end of the torsion spring is fixedly connected to the rotating column, and the other end of the torsion spring is fixedly connected to the second moving column. In the initial state, the torsion spring makes the rotating column away from the center of the horizontal platform to maintain a horizontal state. Two distance control cylinders are fixedly installed on the upper end of the rotating column, and the two distance control cylinders are arranged on the left and right. A cylindrical spring is fixedly installed on the telescopic end of the distance control cylinder, and an extrusion block is fixedly installed on the end of the cylindrical spring.

7. A thermoforming method for a plastic packaging box according to claim 5, characterized in that: The control component includes a limit plate, a limit plate is fixedly installed at one end of the movable column second toward the center of the horizontal platform, a winding column is rotatably connected to the middle part of the movable column, a retractable linkage rod is fixedly connected between the winding columns on the front and rear sides, the linkage rod cannot rotate relative to the winding column, the vertical height of the winding column is lower than the height of the lower connecting rod, a traction wire rope 1 is fixedly connected to the winding column and the winding directions of the traction wire rope 1 on the winding columns on the left and right sides are opposite, the end of the traction wire rope 1 slides up and down through the compensation column and the limit plate, and is finally fixedly connected to the rotating column, the winding columns on the front and rear sides are fixedly connected, a sprocket wheel 5 is fixedly installed at the front end of the front winding column, and the sprocket wheels 5 are connected through a toothed chain belt 3 transmission connection.

8. A thermoforming method for a plastic packaging box according to claim 5, characterized in that: The distance control member includes a distance control rod, and the distance control rod is connected to the left and right corresponding moving columns for common rotation. The distance control rod and the moving column are fixedly connected with two traction wire ropes wound around the distance control rod. The traction wire ropes slide up and down and pass through the compensation column, and are finally fixedly connected to the moving column.

9. A thermoforming method for a plastic packaging box according to claim 8, characterized in that: The linkage parts include sprocket two, the right end of the distance control rod is fixedly connected to sprocket two, the right end of the horizontal platform is symmetrically connected to sprocket three for front and rear rotation, a fixed plate is fixedly installed in the middle of the right end of the horizontal platform, the middle of the fixed plate is rotatably connected to bidirectional screw two, the bidirectional screw two is symmetrically threaded with a rectangular block, the middle of the fixed plate is rotatably connected to a limit rod that slides up and down and penetrates the rectangular block, the left end of the rectangular block is symmetrically connected to the tensioning wheel for upper and lower rotation, and in the initial state, sprocket two, sprocket three and the uppermost tensioning wheel and the lowermost tensioning wheel are connected through toothed chain belt two.

10. A plastic packaging box thermoforming method according to claim 7, characterized in that: The linkage rod comprises a fixed round rod, the front and rear corresponding winding columns are fixedly connected with the fixed round rod, the fixed round rods are connected with a movable round rod for forward and backward sliding movement, and the movable round rod and the fixed round rod are fixedly connected with a fixed spring.

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