Disposable plastic lunch box forming device

Abstract

The application discloses a disposable plastic lunch box forming device and relates to the field of plastic products.The technical scheme is as follows: a frame is arranged with a marking mechanism, a hot-pressing mechanism, an ejection mechanism and an output mechanism arranged in sequence from the front end to the rear end; the output mechanism is used for pulling the softened plastic sheet into the device; the hot-pressing mechanism is used for hot-pressing the plastic sheet into a lunch box blank; the ejection mechanism is used for ejecting the blank after the lunch box is cut; the marking mechanism comprises a mounting frame fixedly connected to the front end of the frame; the vertical rods of the mounting frame are provided with cooling pieces at the middle of the opposite surfaces; the user can adjust the distance between the adjacent cutter discs according to the size of the lunch box; the cutter discs with different outer diameters can be replaced to match the width of the lunch box; the distance between the longitudinal marks can be adjusted according to the requirement; the longitudinal marks and the transverse marks are matched to form a grid-shaped mark pattern suitable for different sizes of lunch boxes, and the application range and the adjustment flexibility of the device are further improved.

Description

Technical Field

[0001] This invention relates to the field of plastic product molding, and more specifically, to a disposable plastic lunch box molding apparatus. Background Technology

[0002] Disposable plastic lunch boxes are widely used in catering, food packaging and fast food delivery due to their advantages such as being lightweight, hygienic and inexpensive. Disposable plastic lunch boxes are mainly manufactured using thermoforming technology: after heating and softening rolled plastic sheets, they are pressed into lunch box blanks through a thermoforming mold, and then cut to obtain the finished product.

[0003] In the thermoforming process, softened plastic sheets move continuously forward via a conveyor belt, sequentially entering the thermoforming station and the cutting station. The thermoforming process shapes the sheet into the three-dimensional shape of a lunchbox. Subsequently, the cutting process uses a special transverse cutting tool to divide the continuous sheet into individual finished products. In actual production, due to diversified market demand, it is often necessary to alternately produce multiple different specifications of lunchboxes on the same production line. Each specification of lunchbox must be equipped with a precisely matched special transverse cutting tool to ensure smooth cutting edges and qualified dimensional tolerances.

[0004] This multi-specification mixed production mode directly leads to the problem of frequent tool changes. When switching batches, operators need to disassemble the entire set of cutting tools currently installed, install the new specification corresponding tools, and readjust the alignment and gaps. The tool system is no longer a single transverse cutting tool, but a tool group composed of multiple tools arranged in a specific way. Once a specification needs to be changed, not only must each tool be disassembled and installed one by one, but the relative position, synchronization, and matching relationship with the conveyor belt speed of each tool must also be adjusted as a whole, making the debugging more difficult.

[0005] Therefore, in order to solve the above-mentioned technical problems, this application proposes a disposable plastic lunch box forming device. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a disposable plastic lunch box forming device.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a disposable plastic lunch box forming device, comprising a frame, wherein an indentation mechanism, a hot pressing mechanism, an ejection mechanism and an output mechanism are sequentially arranged from the front end to the rear end of the frame;

[0008] The output mechanism is used to pull the heated and softened plastic sheet into the device, the hot pressing mechanism is used to hot press the plastic sheet into a lunch box blank, and the ejection mechanism is used to eject the blank after the lunch box is cut.

[0009] The indentation mechanism includes a mounting frame fixedly connected to the front end of the frame. A cooling component is provided in the middle of the opposite side of the vertical rod of the mounting frame. The cooling component includes a pipe rotatably connected to the mounting frame and an output roller disposed below the pipe and rotatably connected to the mounting frame. A plastic sheet passes through the gap between the pipe and the output roller.

[0010] A connecting plate is fixedly connected to the middle and right end of the pipe. Multiple valves are fixedly connected to the outer ring of the connecting plate. Copper pipes are connected to the corresponding valves between two connecting plates. A transverse cutting tool is fixedly connected to the side of the copper pipe away from the pipe.

[0011] Multiple mounting plates are detachably connected to the surface of the pipe located between two connecting plates. A cutter head is fixedly connected to the outer ring of the mounting plate. The radius of the cutter head is the same as the farthest distance from the transverse cutting blade to the center of the pipe. When the pipe rotates, it drives the copper pipe, the cutter head, and the transverse cutting blade to rotate synchronously. The cutter head moves in the pipe. Multiple longitudinal cutting blades are fixedly connected to the middle of the outer ring of the cutter head, which can form transverse and longitudinal indentations on the plastic sheet respectively, combined into a grid-like indentation, and cut corresponding intermittent cut marks at the grid-like indentation.

[0012] Preferably, it also includes a drive component for rotating the pipe and an inlet and an outlet for introducing cooling water into the pipe. The drive component is located on the top left side of the mounting bracket, the inlet is rotatably connected to the right side port of the pipe, and the outlet is rotatably connected to the left side port of the pipe.

[0013] Preferably, the surface of the pipe has multiple through slots arranged in a ring array at the position of the connecting plate, and the inside of the connecting plate has a first connecting pipe at the position of the through slots. The cooling water in the pipe enters the inside of the connecting plate, then flows into the inside of the copper pipe through the valve, and flows along the copper pipe to the connecting plate on the other side to form a circulating heat exchange loop.

[0014] Preferably, the surface of the cutter disc is provided with a receiving groove, which is evenly distributed along the outer edge of the cutter disc and its shape is adapted to the outer diameter of the copper tube, so as to accommodate the copper tube when the copper tube rotates with the connecting disc.

[0015] Preferably, the surface of the pipe is slidably connected with a plurality of triangular blocks, the cross-sectional shape of the triangular blocks being isosceles triangles. The portion of the triangular block near the mounting plate passes through the pipe and extends to the outside of the pipe, while the bottom area of ​​the triangular block is located inside the pipe. When the mounting plate moves along the axial direction of the pipe, it can squeeze the triangular block, causing it to move into the pipe and forming a gap between the triangular block and the pipe for cooling water to flow out.

[0016] Preferably, the front and rear surfaces of the triangular block are provided with grooves, and the end of the pipe near the groove extends into the groove, restricting the triangular block to move only in a direction perpendicular to the axis of the pipe. The groove is provided with a return spring welded to the pipe, which is used to reset the triangular block when it is not squeezed.

[0017] Preferably, the mounting plate has an annular groove inside, a third through hole corresponding to the position of the triangular block inside the mounting plate, a second through hole communicating with the annular groove on the outer ring surface of the mounting plate, a receiving cavity inside the cutter head, and a first through hole communicating with the annular groove and the receiving cavity on the inner ring of the cutter head. Cooling water enters the receiving cavity through the second through hole and the first through hole to cool the cutter head.

[0018] Preferably, sealing gaskets are fixedly connected to both the left and right sides of the inner surface of the mounting plate to prevent cooling water from leaking from the gap between the mounting plate and the pipe. A triangular groove is provided between the two third through holes, and the top of the triangular block opposite to the mounting plate extends out of the pipe and is inserted into the triangular groove.

[0019] Preferably, the bottom of the triangular block is provided with an inclined groove, the inclined surface of which is opposite to the flow direction of the cooling water. When the cooling water flows, it impacts the inclined groove and generates an upward thrust on the triangular block, thereby enhancing the sealing between the triangular block and the pipe and the restraining force on the mounting plate.

[0020] Preferably, the mounting plate is slidably connected to the surface of the pipe and its position can be adjusted along the axial direction of the pipe. The cutter head and the mounting plate are detachably connected to the pipe. The driving component includes a motor fixed to the top left side of the mounting bracket and gears fixed to the motor output shaft and the left end of the pipe, respectively. A gear ring is meshed between the two gears.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This solution involves setting up an indentation mechanism before the hot pressing process. A rotating copper tube and a cutting disc form a grid-like indentation on the softened plastic sheet. Intermittent cuts are then made at the indentation using transverse and longitudinal cutting blades. The number of transverse cutting blades and the position of the longitudinal cutting blades can be adjusted to suit different sizes of lunch boxes. After being cooled by circulating cooling water, the indented area hardens rapidly to form a mesh support structure. This support structure divides the large softened area into multiple independent small areas, effectively suppressing the shaking of the plastic sheet during conveying and cutting, avoiding the undesirable situation of a thick bottom and thin edges in the lunch box, and significantly improving the product molding quality and material utilization rate.

[0023] In this design, the copper tubes are detachably connected to the first connecting tube of the connecting plate. Users can flexibly increase or decrease the number of copper tubes according to the required size of the lunch box. When producing small-sized lunch boxes, the number of copper tubes is increased to improve the indentation density and enhance the constraint effect on the softened area. When producing large-sized lunch boxes, the number of copper tubes is reduced to reduce the indentation density and avoid excessive indentation from affecting the subsequent forming performance of the sheet. This design enables the device to adapt to the production needs of lunch boxes of various specifications and significantly improves the versatility of the equipment.

[0024] In this design, the mounting plate is slidably connected to the pipe surface and its position can be adjusted axially. At the same time, the cutter head and the mounting plate are detachably connected. Users can adjust the spacing between adjacent cutter heads according to the size of the lunch box and replace the cutter heads with different outer diameters to match the width of the lunch box. The spacing of the longitudinal indentations can be adjusted as needed, and together with the transverse indentations, they form a grid-like indentation pattern that adapts to different lunch box sizes, further improving the applicability and adjustment flexibility of the device.

[0025] This solution achieves on-demand distribution of cooling water by setting a sliding triangular block inside the pipeline, in conjunction with the sealing gasket and triangular groove structure on the inner surface of the mounting plate. When the mounting plate moves to different positions along the pipeline axis, the triangular block can always cooperate with the triangular groove on the mounting plate, ensuring that cooling water is supplied only at the location of the cutter head. Regardless of how the position of the mounting plate is adjusted, the cutter head can be effectively cooled. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is an overall view of the molding device in this invention;

[0028] Figure 2 This is an overall side view of the molding apparatus in this invention;

[0029] Figure 3 This is a top view of the molding apparatus in this invention;

[0030] Figure 4 This is an overall view of the indentation mechanism in this invention;

[0031] Figure 5 This is an overall view of the indentation mechanism after the motor has been removed in this invention;

[0032] Figure 6 This is a connection diagram of the pipes, connecting disc, cutter head, and mounting disc in this invention;

[0033] Figure 7This is a cross-sectional view of the pipe, connecting disc, cutter head, and mounting disc in this invention.

[0034] Figure 8 This is a diagram showing the internal structure of the connecting disk in this invention;

[0035] Figure 9 In this invention Figure 7 Enlarged view of part A;

[0036] Figure 10 This is a structural diagram of the installation disk in this invention;

[0037] Figure 11 This is a diagram showing the internal structure of the cutter head in this invention;

[0038] Figure 12 This is a cross-sectional view showing the connection between the cutter head, mounting plate, and triangular block in this invention;

[0039] Figure 13 In this invention Figure 12 Enlarged view of part B.

[0040] 1. Frame; 11. Ejection mechanism; 12. Hot pressing mechanism; 13. Output mechanism; 2. Indentation mechanism; 21. Motor; 22. Output roller; 23. Cooling component; 231. Water inlet; 232. Water outlet; 233. Pipe; 234. Through groove; 24. Mounting bracket; 25. Connecting plate; 251. Copper pipe; 252. Transverse cutting tool; 252. First connecting pipe; 253. Valve; 26. Cutting disc; 261. Receiving cavity; 262. First through hole; 263. Receiving groove; 264. Longitudinal cutting tool; 27. Mounting plate; 271. Second through hole; 272. Annular groove; 273. Third through hole; 274. Sealing gasket; 275. Triangular groove; 28. Drive component; 281. Gear ring; 282. Gear; 29. ​​Triangular block; 291. Inclined groove; 292. Return spring; 293. Slide groove. Detailed Implementation

[0041] like Figure 1-13 As shown, the present invention provides a disposable plastic lunch box forming device, including a frame 1, which serves as the supporting foundation for the entire device. From the front end to the rear end, the frame 1 is provided with an indentation mechanism 2, a hot pressing mechanism 12, an ejection mechanism 11, and an output mechanism 13. The output mechanism 13 is used to pull the heated and softened rolled plastic sheet into the interior of the device, so that the plastic sheet is continuously conveyed in the device in a predetermined direction. The plastic sheet first enters the hot pressing mechanism 12 for hot pressing and is hot-pressed into a lunch box blank. Then, the ejection mechanism 11 ejects the formed lunch box blank, and finally the finished lunch box is obtained.

[0042] The indentation mechanism 2 includes a mounting frame 24 fixedly connected to the front end of the frame 1. The mounting frame 24 has an inverted U-shaped structure with two vertical rods and one horizontal rod. A cooling component 23 is provided in the middle of the opposite face of the vertical rods of the mounting frame 24. The cooling component 23 includes a pipe 233 rotatably connected to the middle of the opposite face of the two vertical rods of the mounting frame 24. The pipe 233 is horizontally arranged and can rotate around its own axis. An output roller 22 rotatably connected to the mounting frame 24 is provided at the bottom of the pipe 233. The output roller 22 is also horizontally arranged and parallel to the pipe 233. The plastic sheet passes through the gap between the pipe 233 and the output roller 22. The bottom of the plastic sheet always remains in contact with the top of the output roller 22 during rotation. The output roller 22 is passively rotated under the drive of the plastic sheet, which plays a supporting and guiding role for the plastic sheet.

[0043] During the conveying of the plastic sheet, a connecting plate 25 is fixedly connected to the middle and right end of the pipe 233. The distance between the two connecting plates 25 is greater than the width of the plastic sheet, ensuring that the plastic sheet can pass through the two connecting plates 25. The connecting plates 25 can be rotated synchronously by rotating the pipe 233. Multiple valves 253 arranged in a ring array are fixedly connected to the outer ring of the connecting plate 25. The valves 253 are openable and closable joint structures. Copper pipes 251 are fixedly connected between the valves 253 facing each other on the surfaces of the two connecting plates 25. The copper pipes 251 are set horizontally and parallel to the pipe 233. Multiple copper pipes 251 are evenly distributed along the circumference of the connecting plate 25.

[0044] During the movement of the softened plastic sheet, as the pipe 233 rotates, the copper pipe 251 moves in a circular motion around the axis of the pipe 233. When the copper pipe 251 rotates to the lowest position, the outer wall of the copper pipe 251 contacts the upper surface of the plastic sheet and applies pressure to it, causing the softened plastic sheet to be compressed and form a transverse indentation. The transverse indentation extends along the width direction of the plastic sheet, and the distance between two adjacent transverse indentations is determined by the included angle between adjacent copper pipes 251.

[0045] Multiple equally spaced mounting discs 27 are detachably connected to the surface of pipe 233 between two connecting discs 25. The mounting discs 27 are fitted onto the outer surface of pipe 233 and fixedly connected to it. A cutter disc 26 is fixedly connected to the outer ring of the mounting disc 27. The cutter disc 26 has a disc-shaped structure, and its outer diameter is the same as the furthest distance from the transverse cutting blade 252 to the center of pipe 233. During the rotation of pipe 233, pipe 233 carries the mounting discs 27 and the cutter disc 26. The outer edge of the cutter disc 26 and the cutting edge of the transverse cutting blade 252 are at the same radius of rotation. When the cutter disc 26 rotates to its lowest position, its outer edge applies pressure to the plastic sheet, forming longitudinal indentations. These longitudinal indentations extend along the length of the plastic sheet. The spacing between two adjacent longitudinal indentations is determined by the axial distance between adjacent mounting discs 27. Receiving grooves 263 are formed on the surface of the cutter disc 26, and these grooves are evenly distributed along the outer edge of the cutter disc 26. The shape is adapted to the outer diameter of the copper tube 251. When the copper tube 251 rotates with the connecting disc 25 to the position where it intersects with the cutter disc 26, the copper tube 251 passes precisely through the receiving groove 263, thereby avoiding mechanical interference between the two and ensuring that the copper tube 251 and the cutter disc 26 can independently and continuously apply indentations to the plastic sheet. A transverse cutting blade 252 is fixedly connected to the side of the copper tube 251 away from the pipe 233 to form transverse and longitudinal indentations on the plastic sheet, which are combined to form a grid-like indentation. The blades are indented and cut into a grid pattern at the indentation. Multiple longitudinal cutting blades 264 are fixedly connected to the middle of the outer ring of the blade disc 26. The bottom of the longitudinal cutting blades 264 is on the same plane as the edge of the blade disc 26. When the edge of the blade disc 26 indents the plastic sheet, the longitudinal cutting blades 264 cut at the indentation. The multiple longitudinal cutting blades 264 are arranged in a ring array at the edge of the blade disc 26, with gaps between each pair, so that the transverse blades are intermittent, which facilitates subsequent pressing.

[0046] The transverse and longitudinal indentations intersect and combine to form a grid-like indentation, dividing the surface of the softened plastic sheet into multiple rectangular or square small areas. The plastic at the indentation is compressed and becomes thinner, and then rapidly cools and hardens upon contact with the cooling element 23, forming a grid-like support skeleton. These hardened grid skeletons can support and constrain adjacent uncompressed softened areas, preventing the plastic sheet from swaying during subsequent movement. Since the plastic sheet is divided into multiple independent softened small areas, the area of ​​each small area is much smaller than the original large softened area, and its anti-sway ability is significantly enhanced. Even if a softened area in one grid undergoes local deformation, it will not affect the softened areas in other grids, thus ensuring the molding quality of the subsequent hot pressing mechanism 12.

[0047] A motor 21 is fixedly connected to the top left side of the mounting bracket 24. The left end of the pipe 233 passes through the left vertical rod of the mounting bracket 24 and continues to extend outward. A drive unit 28 is provided on the left side of the mounting bracket 24. The drive unit 28 is used to transmit the power of the motor 21 to the pipe 233. The drive unit 28 includes gears 282 fixed to the output shaft of the motor 21 and the left end of the pipe 233, respectively. A gear ring 281 meshes between the two gears 282. By controlling the rotation of the motor 21, the gear 282 at the output shaft end of the motor 21 rotates accordingly. The gear 282 drives the gear 282 at the end of the pipe 233 to rotate through the gear ring 281, thereby driving the pipe 233 to rotate around its own axis, so that the rotation speed of the pipe 233 can be precisely matched with the conveying speed of the plastic sheet.

[0048] A water outlet 232 is rotatably connected to the left end of pipe 233, and a water inlet 231 is rotatably connected to the right end of pipe 233, passing through mounting bracket 24. Both water inlet 231 and water outlet 232 are hollow pipe joint structures used to connect to external cooling water circulation pipes. Cooling water is supplied into the interior of pipe 233 from water inlet 231. The cooling water flows along the internal channel of pipe 233 and is discharged through water outlet 232 after passing through pipe 233, forming a circulating cooling loop. During the process of cooling water flowing through the interior of pipe 233, it exchanges heat with copper pipe 251 and cutter head 26 through the pipe wall of pipe 233. The copper tube 251 and the cutter head 26 are cooled, and the inlet end 231 and the outlet end 232 are rotatably connected to the pipe 233. When the pipe 233 rotates, the inlet end 231 and the outlet end 232 remain fixed and do not rotate with the pipe 233, thereby avoiding the impact of the pipe 233's rotation on the delivery of cooling water and ensuring a continuous and stable supply of cooling water. After the softened plastic sheet is pressed, when the low-temperature copper tube 251 and the cutter head 26 come into contact with the plastic sheet, they can quickly remove the heat from the plastic at the indentation, accelerate the curing and hardening of the indentation, and enable the cured area to form a stable support structure more quickly.

[0049] Multiple through slots 234 arranged in a ring array are formed on the surface of pipe 233 at the location of connecting plate 25. These through slots 234 penetrate the pipe wall of pipe 233, connecting the interior of pipe 233 to the interior of connecting plate 25. A first connecting pipe 252 is formed inside connecting plate 25 at the location corresponding to the through slots 234. The first connecting pipe 252 is a channel structure inside connecting plate 25, allowing cooling water from pipe 233 to reach the interior of connecting plate 25 through the through slots 234 and the first connecting pipe 252. Valve 253 communicates with the interior of connecting plate 25 and copper pipe 251. Cooling water flows from the interior of connecting plate 25 into copper pipe 251 through valve 253, flows axially along copper pipe 251 to the left side of connecting plate 25, and then through valve 25 on the left side. 3. The water enters the left connecting plate 25 and then enters the pipe 233 again through the first connecting pipe 252 and the through groove 234 on the left. Cooling water flows from the right connecting plate 25 through the copper pipe 251 to the left connecting plate 25, forming a complete heat exchange loop. This circulates and cools the copper pipe 251, accelerating the curing effect of the indentation. Multiple valves 253 are arranged in a ring array. Users can selectively install copper pipes 251 on the valves 253 according to the size of the lunch box. When producing small-sized lunch boxes, the number of copper pipes 251 is increased, resulting in a higher pressing frequency and greater indentation density of the softened plastic sheet, thus providing a stronger constraint effect on the softened area. When producing large-sized lunch boxes, the number of copper pipes 251 is reduced to decrease the indentation density and avoid excessive indentation that could affect the subsequent molding performance of the sheet.

[0050] Multiple triangular blocks 29 are slidably connected to the surface of pipe 233. The cross-sectional shape of the triangular blocks 29 is an isosceles triangle, with the apex of the triangular block extending out of the outer surface of pipe 233. The part of the triangular block 29 near the mounting plate 27 passes through pipe 233 and extends to the outside of pipe 233, while the bottom part of the triangular block 29 is inside pipe 233. This structure facilitates the adjustment of the position of the mounting plate 27 by moving axially along the surface of pipe 233. The inner wall of the mounting plate 27 can apply a squeezing force to the top of the triangular block 29. After being squeezed, the triangular block 29 moves into the inside of pipe 233. When the triangular block 29 moves down, a gap appears between the triangular block 29 and pipe 233. At this time, the cooling water in pipe 233 can flow out from the gap.

[0051] An annular groove 272 is formed inside the mounting plate 27, which is an annular groove surrounding the inner wall of the mounting plate 27. A third through hole 273 is formed inside the mounting plate 27 corresponding to the position of the triangular block 29. The third through hole 273 penetrates the wall thickness of the mounting plate 27, with one end connected to the annular groove 272 and the other end extending to the inner wall surface of the mounting plate 27. When the triangular block 29 moves down, the cooling water in the pipe 233 flows into the gap between the inner wall of the mounting plate 27 and the outer wall of the pipe 233 through the gap between the triangular block 29 and the pipe 233, and then is delivered to the annular groove 272 through the third through hole 273. The outer ring surface of the mounting plate 27 is formed with... A second through hole 271 connects the outside to the annular groove 272, allowing cooling water in the annular groove 272 to be transported outward through the second through hole 271 and finally enter the cutter head 26. The cutter head 26 has a receiving cavity 261 inside, which is an annular cavity inside the cutter head 26. A first through hole 262 is provided at the inner ring of the cutter head 26 to connect the annular groove 272 and the receiving cavity 261, so that the cooling water in the annular groove 272 can reach the inside of the receiving cavity 261 through the first through hole 262, allowing the cooling water to enter the receiving cavity 261 and cool the cutter head 26 as a whole, accelerating the curing of the indentation formed by the press of the cutter head 26, and enhancing the uniformity of heat dissipation.

[0052] Both the front and rear surfaces of the triangular block 29 are provided with grooves 293. The grooves 293 are elongated grooves extending along the sliding direction of the triangular block 29. One end of the pipe 233 extends into the groove 293, and the groove 293 cooperates with the protruding structure on the pipe 233 to guide and limit the movement of the triangular block 29, ensuring that the triangular block 29 can only move up and down in a direction perpendicular to the axis of the pipe 233, preventing the triangular block 29 from shifting or rotating. A return spring 292, welded to the pipe 233, is installed inside the groove 293. One end of the return spring 292 is fixed to the pipe 233, and the other end abuts against the bottom of the groove 293. The return spring 292 is in a naturally extended state when the triangular block 29 extends out of the pipe 233. After being squeezed by the mounting plate 27, the triangular block 29 moves downward, and the return spring 292 changes from a naturally extended state to a compressed and tense state. When the mounting plate 27 is removed, the triangular block 29 returns to its original position under the elastic restoring force of the return spring 292, so that the device can be reused. There are multiple sets of triangular blocks 29, which are distributed along the axial direction of the pipe 233. The user can select to fix the mounting plate 27 at any position corresponding to any set of triangular blocks 29 according to the required lunch box size, so as to adjust the spacing between adjacent mounting plates 27 and make the device work better. After the triangular block 29 extends out of the pipe 233, the side of the triangular block 29 blocks the gap between the pipe 233 and the triangular block 29, preventing the cooling water from flowing out of the gap, and ensuring that the cooling water is only supplied at the location of the mounting plate 27.

[0053] Sealing gaskets 274 are fixedly connected to both the left and right sides of the inner surface of the mounting plate 27. The sealing gaskets 274 are annular elastic washers, tightly fitted between the inner wall of the mounting plate 27 and the outer wall of the pipe 233. The sealing gaskets 274 restrict the flow of cooling water through the gap between the mounting plate 27 and the pipe 233, preventing leakage of cooling water from both axial sides of the mounting plate 27. A triangular groove 275 is formed between the two third through holes 273. The triangular groove 275 is a V-shaped groove formed on the inner wall of the mounting plate 27, its shape matching the tip of the triangular block 29. The top of the triangular block 29, opposite to the mounting plate 27, extends out of the pipe 233 and engages with the interior of the triangular groove 275. The tip of the triangular block 29 cooperates with the V-shaped bottom of the triangular groove 275, achieving axial positioning and fixation of the mounting plate 27, preventing leakage. As the mounting plate 27 rotates in the pipe 233, it slides axially. The bottom of the triangular block 29 has an inclined groove 291. The inclined surface of the inclined groove 291 is opposite to the flow direction of the cooling water. When the cooling water flows inside the pipe 233, the water flow impacts the inclined surface of the inclined groove 291, generating an upward thrust on the triangular block 29. Because the inclined groove 291 is impacted by the water, the triangular block 29 is always subjected to the thrust of the water flow. Therefore, the triangular block 29 always has an upward tendency to move, squeezing the inner wall of the pipe 233. This structure increases the sealing between the triangular block 29, which is not squeezed by the mounting plate 27, and the pipe 233. At the same time, it increases the restraining force of the triangular block 29, which is squeezed by the mounting plate 27, on the mounting plate 27, making the mounting plate 27 more firmly fixed and the device more effective.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Those skilled in the art can readily implement the invention based on the accompanying drawings and the description above. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, using the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A disposable plastic lunchbox forming device, comprising a frame (1), characterized in that: The frame (1) is provided with an indentation mechanism (2), a hot pressing mechanism (12), an ejection mechanism (11) and an output mechanism (13) in sequence from the front end to the rear end. The output mechanism (13) is used to pull the heated and softened plastic sheet into the device, the hot pressing mechanism (12) is used to hot press the plastic sheet into a lunch box blank, and the ejection mechanism (11) is used to eject the blank after cutting the lunch box. The indentation mechanism (2) includes a mounting frame (24) fixedly connected to the front end of the frame (1). A cooling element (23) is provided in the middle of the opposite side of the vertical rod of the mounting frame (24). The cooling element (23) includes a pipe (233) rotatably connected to the mounting frame (24) and an output roller (22) located below the pipe (233) and rotatably connected to the mounting frame (24). The plastic sheet passes through the gap between the pipe (233) and the output roller (22). A connecting plate (25) is fixedly connected to the middle and right end of the pipe (233). Multiple valves (253) are fixedly connected to the outer ring of the connecting plate (25). A copper pipe (251) is connected to the corresponding valve (253) between two connecting plates (25). A transverse cutting tool (252) is fixedly connected to the side of the copper pipe (251) away from the pipe (233). The pipe (233) is located on the surface between two connecting discs (25) and multiple mounting discs (27) are detachably connected. A cutter disc (26) is fixedly connected to the outer ring of the mounting disc (27). The radius of the cutter disc (26) is the same as the farthest distance from the transverse cutting tool (252) to the center of the pipe (233). When the pipe (233) rotates, it drives the copper pipe (251), the cutter disc (26) and the transverse cutting tool (252) to rotate synchronously. The cutter disc (26) moves in the pipe (233). Multiple longitudinal cutting tools (264) are fixedly connected in the middle of the outer ring of the cutter disc (26), which can form transverse and longitudinal indentations on the plastic sheet respectively, combine them into a grid-like indentation, and cut out corresponding intermittent knife marks at the grid-like indentation.

2. The disposable plastic lunch box forming device according to claim 1, characterized in that: It also includes a drive unit (28) for rotating the pipe (233) and an inlet end (231) and an outlet end (232) for introducing cooling water into the pipe (233). The drive unit (28) is located on the top left side of the mounting bracket (24). The inlet end (231) is rotatably connected to the right port of the pipe (233), and the outlet end (232) is rotatably connected to the left port of the pipe (233).

3. The disposable plastic lunch box forming device according to claim 1, characterized in that: The surface of the pipe (233) is provided with multiple through slots (234) arranged in a ring array at the position of the connecting plate (25). The inside of the connecting plate (25) is provided with a first connecting pipe (252) corresponding to the position of the through slots (234). The cooling water in the pipe (233) enters the inside of the connecting plate (25), and then flows into the inside of the copper pipe (251) through the valve (253), and flows along the copper pipe (251) to the connecting plate (25) on the other side, forming a circulating heat exchange loop.

4. The disposable plastic lunch box forming device according to claim 1, characterized in that: The surface of the cutter head (26) is provided with a receiving groove (263). The receiving groove (263) is evenly distributed along the outer edge of the cutter head (26) and its shape is adapted to the outer diameter of the copper tube (251). It is used to receive the copper tube (251) when the copper tube (251) rotates with the connecting plate (25).

5. The disposable plastic lunch box forming device according to claim 1, characterized in that: Multiple triangular blocks (29) are slidably connected to the surface of the pipe (233). The cross-sectional shape of the triangular blocks (29) is an isosceles triangle. The part of the triangular block (29) near the mounting plate (27) passes through the pipe (233) and extends to the outside of the pipe (233). The bottom area of ​​the triangular block (29) is located inside the pipe (233). When the mounting plate (27) moves along the axial direction of the pipe (233), it can squeeze the triangular block (29) and make it move into the inside of the pipe (233), forming a gap between the triangular block (29) and the pipe (233) for cooling water to flow out.

6. The disposable plastic lunch box forming device according to claim 5, characterized in that: The front and rear surfaces of the triangular block (29) are provided with grooves (293). One end of the pipe (233) near the groove (293) extends into the groove (293) to restrict the triangular block (29) to move only in a direction perpendicular to the axis of the pipe (233). The groove (293) is provided with a return spring (292) welded to the pipe (233). The return spring (292) is used to reset the triangular block (29) when it is not squeezed.

7. The disposable plastic lunch box forming device according to claim 5, characterized in that: The mounting plate (27) has an annular groove (272) inside. The mounting plate (27) has a third through hole (273) at the position corresponding to the triangular block (29) inside. The outer ring surface of the mounting plate (27) has a second through hole (271) connecting the annular groove (272). The cutter head (26) has a receiving cavity (261) inside. The inner ring of the cutter head (26) has a first through hole (262) connecting the annular groove (272) and the receiving cavity (261). Cooling water enters the receiving cavity (261) through the second through hole (271) and the first through hole (262) to cool the cutter head (26).

8. The disposable plastic lunch box forming device according to claim 5, characterized in that: The inner surface of the mounting plate (27) is fixedly connected with sealing gaskets (274) on both the left and right sides to prevent cooling water from leaking from the gap between the mounting plate (27) and the pipe (233). A triangular groove (275) is provided between the two third through holes (273). The top of the triangular block (29) opposite to the mounting plate (27) extends out of the pipe (233) and is inserted into the triangular groove (275).

9. The disposable plastic lunch box forming device according to claim 5, characterized in that: The bottom of the triangular block (29) is provided with a sloping groove (291). The inclined surface of the sloping groove (291) is opposite to the flow direction of the cooling water. When the cooling water flows, it impacts the sloping groove (291) and generates an upward thrust on the triangular block (29), so as to enhance the sealing between the triangular block (29) and the pipe (233) and the limiting force on the mounting plate (27).

10. The disposable plastic lunch box forming device according to claim 2, characterized in that: The mounting plate (27) is slidably connected to the surface of the pipe (233) and its position can be adjusted along the axial direction of the pipe (233). The cutter head (26) and the mounting plate (27) are detachably connected to the pipe (233). The driving component (28) includes a motor (21) fixed to the top left side of the mounting bracket (24) and gears (282) fixed to the output shaft of the motor (21) and the left end of the pipe (233) respectively. A gear ring (281) meshes between the two gears (282).

Images