PET foaming sheet box manufacturing device

Abstract

The invention relates to the technical field of foamed sheet box manufacturing, and provides a PET foamed sheet box manufacturing device which comprises a sheet manufacturing production line, a thickness uniformizing mechanism and a die cutting mechanism. The sheet preparation production line is used for preparing a first sheet, the thickness uniformizing mechanism comprises a plurality of first roller bodies, the distances between every two adjacent first roller bodies are equal, and the first roller bodies rotate synchronously; the die cutting mechanism comprises a first box body, a die cutting die, a first heater and a cutting knife, the die cutting die is arranged in the first box body, the first heater is arranged in the die cutting die, the die cutting die is used for carrying out indentation on the first sheet, and the cutting knife is arranged outside the first box body and used for cutting the first sheet along the indentation. According to the PET foaming sheet box making device, when the first sheet is subjected to indentation, temperature loss of the first sheet can be avoided, the stability of the physical property of the first sheet is guaranteed, the toughness and strength of the first sheet are improved, and then the quality of a formed packaging box is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of foam sheet box making, in particular to a PET foam sheet box making device. Background Art

[0002] At present, the production of packaging boxes using PET foam sheets is usually completed in two parts: the first part is the preparation of PET foam sheets, and the second part is the box body indentation and cutting of the PET foam sheets through a die-cutting machine. Since these two parts are produced separately, the production process is not coherent, and the die-cutting of PET foam sheets cannot be carried out at a stable processing temperature, resulting in changes in the physical properties of the material, and the final toughness and strength of the material cannot be guaranteed. It also causes excessive crystallization of the material, which increases the scrap rate in the box making process and increases the manufacturing cost. Summary of the invention

[0003] The invention provides a PET foam sheet box making device, which is used to solve the defect of unstable process temperature during die-cutting of the PET foam sheet in the prior art.

[0004] The present invention provides a PET foam sheet box making device, which is characterized by comprising: a sheet preparation production line, a thickness uniformity mechanism and a die-cutting mechanism; the sheet preparation production line is used to prepare a first sheet, the first sheet is a PET foam sheet that has been foamed twice, the thickness uniformity mechanism comprises a plurality of first rollers, the spacing between two adjacent first rollers is equal, the plurality of first rollers rotate synchronously to control the thickness of the first sheet within a preset thickness, and convey the first sheet to the die-cutting mechanism; the die-cutting mechanism comprises: a first box, a die-cutting die, a first heater and a cutting knife, the first two ends of the first box are provided with a first inlet and a first outlet for the first sheet to pass through, the die-cutting die is arranged in the first box, the first heater is arranged in the die-cutting die, the die-cutting die is used to indent the first sheet, the cutting knife is arranged outside the first box, and the cutting knife is used to cut the first sheet along the indentation.

[0005] According to a PET foam sheet box making device provided by the present invention, the thickness uniformity mechanism also includes a first roller frame, and the first rotating shafts of the plurality of first roller bodies are rotatably connected to the first roller frame; the first rotating shaft has a cavity, and the cavity is used to accommodate a heat-conducting liquid.

[0006] According to a PET foam sheet box making device provided by the present invention, the thickness uniforming mechanism also includes a heat-insulating cover, a plurality of the first rollers are arranged in the heat-insulating cover, a second inlet and a second outlet for the first sheet to pass through are provided on opposite sides of the heat-insulating cover, and a second heater is provided in the heat-insulating cover.

[0007] According to a PET foam sheet box making device provided by the present invention, the sheet preparation production line includes: a feeding mechanism, a traction mechanism and a secondary foaming mechanism; the feeding mechanism is used to accommodate a rolled second sheet, the second sheet is a PET foam sheet that has been foamed once, the traction mechanism is used to transport the second sheet to the secondary foaming mechanism, and the secondary foaming mechanism is used to perform secondary foaming on the second sheet to obtain the first sheet.

[0008] According to a PET foam sheet box making device provided by the present invention, the secondary foaming mechanism includes: a second box body, a pair of conveying components and a plurality of third heaters, and the two ends of the second box body are respectively provided with a third inlet and a third outlet for the second sheet to pass through; a pair of the conveying components are relatively arranged in the second box body, and the pair of the conveying components are synchronously driven to convey the second sheet, and the plurality of the third heaters are arranged in the conveying components so that the second sheet can be secondary foamed in the second box body.

[0009] According to a PET foam sheet box making device provided by the present invention, the conveying component includes: a plurality of rotating structures and a conveyor belt, the conveyor belt is sleeved outside the plurality of rotating structures, each of the rotating structures is provided with the third heater; each of the rotating structures includes a plurality of second rollers and a frame, the second rotating shaft of each of the second rollers is rotatably connected to the frame, and the conveyor belt is sleeved outside the plurality of second rollers.

[0010] According to a PET foam sheet box making device provided by the present invention, the traction mechanism includes: a second roller frame and a pair of third rollers, the pair of third rollers are relatively arranged on the second roller frame, and the pair of third rollers rotate synchronously to convey the second sheet to the secondary foaming mechanism.

[0011] According to a PET foam sheet box making device provided by the present invention, the traction mechanism also includes multiple pairs of detection components and alarms, the detection components are used to detect the position of the second sheet on the third roller body, and the multiple pairs of detection components are respectively arranged on both sides of the second sheet; each pair of detection components includes: a limit block and a sensing block, the limit block is arranged on one side of the second sheet, and the sensing block is arranged on the second roller frame, when the distance between the limit block and the sensing block is less than a preset distance, the sensing block sends a signal to the alarm, and the alarm sounds an alarm.

[0012] A PET foam sheet box making device provided according to the present invention also includes a blanking mechanism, which is arranged downstream of the cutting knife along the conveying direction of the first sheet; the blanking mechanism includes: a third roller frame, a plurality of fourth rollers and a winch; the plurality of fourth rollers are rotatably arranged on the third roller frame, the fourth rollers are used to convey the first sheet after cutting the tailings, and the winch is used to wind up the tailings.

[0013] According to a PET foam sheet box making device provided by the present invention, it also includes a box nailing machine and a robot. Along the conveying direction of the first sheet, the box nailing machine is arranged downstream of the blanking mechanism. The box nailing machine is used to bind the first sheet into a packaging box; the robot is used to stack the packaging boxes.

[0014] The PET foam sheet box making device provided by the present invention can ensure that the thickness of the first sheet after secondary foaming is uniform by arranging a thickness uniformity mechanism; by arranging a first box body and a first heater, the temperature loss of the first sheet can be avoided when the first sheet is indented, thereby ensuring the stability of the physical properties of the first sheet, improving the toughness and strength of the first sheet, and further ensuring the quality of the packaging box after molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the PET foam sheet box making device provided by the present invention.

[0017] Figure 2 yes Figure 1 Schematic diagram of the structure of the secondary foaming mechanism shown in FIG.

[0018] Figure 3 yes Figure 1 The structural schematic diagram of the blanking mechanism is shown in FIG.

[0019] Reference numerals: 11. First roller body; 12. First roller frame; 13. Insulation cover; 21. First box body; 22. Upper mold; 23. Lower mold; 24. Cutting knife; 3. Feeding mechanism; 41. Second roller frame; 42. Third roller body; 5. Secondary foaming mechanism; 51. Second box body; 52. Conveyor belt; 53. Second roller body; 54. Frame; 55. Third heater; 6. Blanking mechanism; 61. Third roller frame; 62. Fourth roller body; 63. Winch; 7. Stitching machine; 8. Robot. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Combine the following Figure 1-Figure 3 The PET foam sheet box-making device of the present invention is described.

[0022] like Figure 1 As shown, in an embodiment of the present invention, a PET foam sheet box making device includes: a sheet preparation production line, a thickness equalization mechanism and a die-cutting mechanism. The sheet preparation production line is used to prepare a first sheet, wherein the first sheet is a PET foam sheet that has undergone secondary foaming. The thickness equalization mechanism includes a plurality of first roller bodies 11, and the spacing between two adjacent first roller bodies 11 is equal. The plurality of first roller bodies 11 rotate synchronously to control the thickness of the first sheet to a preset thickness, and convey the first sheet to the die-cutting mechanism. The die-cutting mechanism includes: a first box body 21, a die-cutting mold, a first heater and a cutting knife 24, the die-cutting mold is arranged in the first box body 21, the first heater is arranged in the die-cutting mold, the die-cutting mold is used to indent the first sheet, the cutting knife 24 is arranged outside the first box body 21, and the cutting knife 24 is used to cut the first sheet along the indentation.

[0023] Specifically, the PET foam sheet after the first foaming is foamed for the second time on the sheet preparation production line to become a PET foam sheet after the second foaming, and the first sheet is obtained. Considering that there may be a problem of uneven foaming during the foaming process, the prepared first sheet may have uneven thickness. Based on this, the prepared first sheet can be made uniform in thickness after being rolled by multiple first rollers 11. In this embodiment, the number of the multiple first rollers 11 can be at least two, and the two first rollers 11 are arranged opposite to each other. The distance between the two first rollers 11 is the preset thickness of the first sheet. When the first sheet passes through the two first rollers 11, not only can the thickness of the first sheet be controlled within the preset thickness range, but also the first sheet can be conveyed to the die-cutting mechanism. Optionally, the number of the plurality of first roller bodies 11 may also be three, and the three first roller bodies 11 are arranged in an L-shaped structure, and the distance between the two first roller bodies 11 located vertically is equal to the distance between the two first roller bodies 11 located horizontally, forming two sets of rolling structures. After the first sheet passes through the two sets of rolling structures, its thickness is more uniform. Optionally, the number of the first roller bodies 11 may also be an even number, that is, the first roller bodies 11 are divided into two rows, and each row has multiple first roller bodies 11, so that the contact area between the first roller bodies 11 and the first sheet can be increased, and the thickness of the first sheet can be more uniform. In this embodiment, the spacing between two adjacent first roller bodies 11 is adjustable so that the uniform thickness mechanism can meet the preparation requirements of packaging boxes of different thicknesses. The thickness of the first sheet is 2mm-10mm, and accordingly, the spacing between two adjacent first roller bodies 11 is also 2mm-10mm.

[0024] The first sheet after rolling enters the die-cutting die in the first box body 21 through the first inlet of the first box body 21 for indentation, and the first sheet after indentation is transported to the cutting knife 24 through the first outlet of the first box body 21 for cutting. In this embodiment, the cavity of the die-cutting die is the same as the pre-molded shape of the packaging box, and the die-cutting die is provided with a first heater so that the material properties of the PET foam sheet are stable and will not change during die-cutting. At the same time, the die-cutting die is set in the first box body 21 to avoid rapid heat loss, ensuring that the temperature of the PET foam sheet is constant during die-cutting and the material properties will not change. The first sheet after indentation is transported to the cutting knife 24, and the cutting knife 24 cuts along the indentation to form the plane shape of the packaging box before binding.

[0025] The PET foam sheet box making device provided in the embodiment of the present invention can ensure the uniform thickness of the first sheet after secondary foaming by providing a uniform thickness mechanism; by providing a first box body and a first heater, the temperature loss of the first sheet can be avoided when the first sheet is indented, thereby ensuring the stability of the physical properties of the first sheet, improving the toughness and strength of the first sheet, and further ensuring the quality of the packaging box after molding.

[0026] Further, in an embodiment of the present invention, the die-cutting die includes: an upper die 22 and a lower die 23, a first heater is arranged on the lower die 23, and the first heater is used to heat the upper die 22 and the lower die 23. In this embodiment, the temperature of the upper die 22 and the lower die 23 is controlled at 70°C-100°C to avoid crystallization of the PET foam sheet. The upper die 22 is driven by a hydraulic cylinder, and the upper die 22 and the lower die 23 are designed with a die structure according to the box type of the packaging box. The lower die 23 is provided with a spray hole, and when the first sheet is indented, the spray hole can spray a safety mark, a PET recyclable mark, and a reminder mark commonly used for packaging boxes on the first sheet to reduce the use of printing ink, reduce energy consumption, and achieve green environmental protection. Optionally, in an embodiment of the present invention, the molding time of stamping and spraying is 6s / mold-10s / mold. The first heater can be an electric heater.

[0027] like Figure 1 As shown, in an embodiment of the present invention, the thickness-leveling mechanism further comprises a first roller frame 12, and the first rotating shafts of the plurality of first roller bodies 11 are rotatably connected to the first roller frame 12, and the first rotating shaft has a cavity, and the cavity is used to accommodate the heat-conducting liquid.

[0028] Specifically, the cavity can be connected to the oil tank through a pipeline, and a heater is provided under the oil tank to keep the temperature of the heat transfer oil within a certain range. When the first sheet enters between the first rollers 11, in order to prevent the temperature of the first sheet from being too low, a heat transfer liquid with a higher temperature is injected into the cavity of the first rotating shaft to prevent the temperature of the first sheet from being too low and the physical properties from changing. Optionally, the heat transfer liquid can be heat transfer oil, and the temperature of the heat transfer oil is 70°C-100°C.

[0029] Furthermore, the thickness uniforming mechanism further includes a heat preservation cover 13, and a second inlet and a second outlet are provided on opposite sides of the heat preservation cover 13 so that the first sheet passes through the heat preservation cover 13. The plurality of first roller bodies 11 and the first roller frame 12 are all arranged in the heat preservation cover 13, and a second heater is provided in the heat preservation cover 13 to ensure that the temperature of the first sheet is constant and to prevent the first sheet from changing its physical properties due to temperature loss. Optionally, the second heater can be an electric heater or a quartz heating tube.

[0030] In an embodiment of the present invention, by controlling the temperature of the heat transfer oil and the temperature of the die-cutting mold at 70°C-100°C, which is below the crystallization temperature of the PET foam sheet, the brittle cracking of the PET foam sheet during crystallization can be avoided, thereby ensuring the quality of the final product and improving the yield rate of the packaging box.

[0031] like Figure 1As shown, in an embodiment of the present invention, the sheet preparation production line includes: a feeding mechanism 3, a traction mechanism and a secondary foaming mechanism 5. The feeding mechanism 3 is used to accommodate the rolled second sheet. In this embodiment, the second sheet is a PET foamed sheet that has been foamed once. The feeding mechanism 3 can be a plurality of roller racks, and the rolled second sheet is sleeved on the rotating shaft of the roller rack. The traction mechanism transports the second sheet to the secondary foaming mechanism 5, and the second sheet is foamed twice in the secondary foaming mechanism 5 to obtain the first sheet.

[0032] like Figure 1 As shown, in this embodiment, the traction mechanism includes: a second roller frame 41 and a pair of third roller bodies 42, the pair of third roller bodies 42 are relatively arranged on the second roller frame 41, and the pair of third roller bodies 42 rotate synchronously to convey the second sheet into the secondary foaming mechanism 5.

[0033] Furthermore, the traction mechanism further includes a plurality of pairs of detection components and alarms, and the detection components are used to detect the position of the second sheet on the third roller body 42. Each pair of detection components includes: a limit block and a sensing block, the limit block is arranged on one side of the second sheet, and the sensing block is arranged on the second roller frame 41. When the distance between the limit block and the sensing block is less than a preset distance, the sensing block sends a signal to the alarm, and the alarm sounds an alarm.

[0034] Specifically, the length of the third roller body 42 is greater than the width of the second sheet. When a pair of third roller bodies 42 convey the second sheet, the position of the second sheet on the third roller body 42 may be offset. In this embodiment, there are two detection components, and the two limit blocks of the two detection components are respectively arranged on both sides of the second sheet, and the two sensing blocks of the two detection components are relatively arranged on the second roller frame 41. During the conveying process of the second sheet, if the position of the second sheet on the third roller body 42 is offset, the distance between the limit block on one side of the second sheet and the sensing block on the corresponding side must be less than the preset distance. At this time, the sensing block sends a signal to the alarm, and the alarm sounds an alarm. The position of the second sheet can be manually adjusted so that the second sheet can enter the secondary foaming mechanism 5.

[0035] like Figure 2 As shown, the secondary foaming mechanism includes: a second box 51, a pair of conveying components and a plurality of third heaters 55. The second box 51 is provided with a third inlet and a third outlet for the second sheet to pass through at both ends. The pair of conveying components are relatively arranged in the second box 51, and the pair of conveying components are synchronously driven to convey the second sheet. The plurality of third heaters 55 are arranged in the conveying components to heat the second sheet so that the second sheet is subjected to secondary foaming in the second box 51.

[0036] In an optional embodiment of the present invention, the conveying assembly may be a structure of a synchronous wheel and a synchronous belt, and the synchronous belt is driven to convey the second sheet.

[0037] In another optional embodiment of the present invention, the conveying assembly includes: a plurality of rotating structures and a conveyor belt 52, the conveyor belt 52 is sleeved outside the plurality of rotating structures, and each rotating structure is provided with a third heater 55. In this embodiment, the heating temperature of the third heater 55 is 100°C-130°C. In this embodiment, a plurality of third heaters 55 are provided on both sides of the second sheet material to heat the second sheet material up and down at the same time, thereby improving the heating efficiency and production efficiency. In this embodiment, in order to prevent the second sheet material from shrinking laterally due to heating, the conveyor belt 52 uses a polytetrafluoroethylene conveyor belt, which has good heat resistance and can ensure that the second sheet material is heated evenly during transportation without additional heat loss.

[0038] Furthermore, if Figure 2 As shown, each rotating structure includes a plurality of second rollers 53 and a frame 54 . The second rotating shaft of each second roller 53 is rotatably connected to the frame 54 , and the conveyor belt 52 is sleeved outside the plurality of second rollers 53 .

[0039] Specifically, in Figure 2 In the illustrated embodiment, the frame 54 of the rotating structure located above the second sheet is a rectangular frame, and a plurality of second rollers 53 are provided on the upper and lower sides of the rectangular frame. When the plurality of second rollers 53 rotate, the conveyor belt 52 is driven to rotate. The frame 54 of the rotating structure located below the second sheet is a trapezoidal frame, and a plurality of second rollers 53 are provided on the upper and lower sides of the trapezoidal frame. When the plurality of second rollers 53 rotate, the conveyor belt 52 is driven to rotate. The third heater is provided on the frame 54.

[0040] It can be understood that the structures of the frames 54 located on both sides of the second sheet can be the same or different, and the shape of the frames 54 can be a rectangular frame, a trapezoidal frame or other shapes.

[0041] The second sheet enters the second box 51 through the third inlet of the second box 51 , is foamed twice in the second box 51 , and is then transported to the thickness equalization mechanism through the third outlet of the second box 51 .

[0042] Optionally, the third heater may be an electric heater, which may be disposed on the frame 54; the third heater may also be a plurality of heating tubes, and the rotating shaft of each second roller 53 has a cavity, in which heat-conducting oil with a relatively high temperature is disposed to heat the second sheet.

[0043] In an embodiment of the present invention, by providing a second box body 51 in the secondary foaming mechanism 5 and a heat preservation cover 13 in the thickness uniforming mechanism, the heating temperature of the PET foam sheet can be always controlled above the softening temperature and below the crystallization temperature, thereby reducing the scrap rate in the box making process.

[0044] In view of the fact that the thickness of the PET foam sheet is relatively thin and does not meet the thickness requirements of the packaging box, in actual use, a method of composite bonding of double-layer PET foam sheets is usually used to increase the thickness of the packaging box. This method has problems such as weak bonding and uneven thickness. After the packaging box is finally formed, the bonding position is very likely to crack when stacked under pressure. In this embodiment, the thickness of the PET foam sheet can be thickened by performing secondary foaming on the PET foam sheet in the secondary foaming mechanism 5, and there is no need to bond and stick the double-layer PET foam sheet, thereby improving the quality and stability of the physical properties of the packaging box after forming.

[0045] like Figure 3 As shown, in an embodiment of the present invention, the PET foam sheet box making device further includes a blanking mechanism 6. Along the conveying direction of the first sheet, the blanking mechanism 6 is located downstream of the cutting knife 24. When the first sheet after indentation is conveyed to the cutting knife 24, the cutting knife 24 cuts off the leftovers, and the leftovers are the tailings. The blanking mechanism 6 includes: a third roller frame 61, a plurality of fourth roller bodies 62 and a winch 63. The plurality of fourth roller bodies 62 are rotatably arranged on the third roller frame 61, and the fourth roller bodies 62 are used to convey the first sheet after the tailings are cut, and the tailings are wound up by the winch 63.

[0046] like Figure 1 As shown, in an embodiment of the present invention, the PET foam sheet box making device further includes a box nailing machine 7 and a robot 8. Along the conveying direction of the first sheet, the box nailing machine 7 is arranged downstream of the blanking mechanism 6, and the first sheet with the tail removed is conveyed to the box nailing machine 7 through a plurality of fourth rollers 62, and the first sheet is stapled into a packaging box by the box nailing machine 7. The robot 8 grabs the packaging box and stacks it. The box nailing machine 7 can staple the first sheet into a packaging box by laser welding or ultrasonic welding.

[0047] The PET foam sheet box making device also includes a temperature control cabinet and an electric control cabinet. The temperature control cabinet is used to adjust the temperature of each heater, and the electric control cabinet is used to control the traction mechanism, the secondary foaming mechanism 5, the thickness uniforming mechanism, the die-cutting mechanism, the blanking mechanism 6, the box nailing machine 7 and the robot 8 to move or stop.

[0048] In an embodiment of the present invention, the rolled second sheet is arranged on a roller frame, and when a pair of third rollers 42 rotate, the PET foam sheet can be continuously conveyed so that the PET foam sheet passes through each workstation in turn to achieve continuous production, which not only ensures the stability of the physical properties of the PET foam sheet, but also improves the production efficiency.

[0049] The PET foam sheet box-making device provided in the embodiment of the present invention can make the thickness of the first sheet twice or more than the thickness of the second sheet by performing secondary foaming on the PET foam sheet, thereby reducing the raw material cost of box-making to more than half of the original cost, and utilize the residual heat after the secondary foaming heating to perform one-time stamping and shaping on the first sheet, so that the first sheet has lower density, better integrity, and a smooth and beautiful appearance; the number of repeated heating of the PET foam sheet is reduced, and cold die cutting is changed to hot stamping, so that the force is more uniform during the processing process, the toughness of the PET foam sheet is better, the scrap rate in the production process is reduced, and the purpose of reducing costs is achieved.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A PET foam sheet box making device, characterized in that: include: Sheet preparation line, thickness leveling mechanism and die-cutting mechanism; The sheet preparation production line is used to prepare a first sheet, the first sheet is a PET foamed sheet after secondary foaming, the thickness uniforming mechanism comprises a plurality of first rollers, the spacing between two adjacent first rollers is equal, the plurality of first rollers rotate synchronously to control the thickness of the first sheet to a preset thickness, and the first sheet is transported to the die-cutting mechanism; The die-cutting mechanism includes: a first box body, a die-cutting mold, a first heater and a cutting knife. The first box body has a first inlet and a first outlet at both ends for the first sheet to pass through. The die-cutting mold is arranged in the first box body. The first heater is arranged in the die-cutting mold. The die-cutting mold is used to indent the first sheet. The cutting knife is arranged outside the first box body. The cutting knife is used to cut the first sheet along the indentation.

2. The PET foam sheet box making device according to claim 1, characterized in that: The thickness equalization mechanism further comprises a first roller frame, and the first rotating shafts of the plurality of first roller bodies are rotatably connected to the first roller frame; The first rotating shaft has a cavity, and the cavity is used to accommodate heat-conducting liquid.

3. The PET foam sheet box making device according to claim 1 or 2, characterized in that: The thickness-leveling mechanism further comprises a heat-insulating cover, a plurality of the first rollers are arranged in the heat-insulating cover, a second inlet and a second outlet for the first sheet to pass through are arranged on opposite sides of the heat-insulating cover, and a second heater is arranged in the heat-insulating cover.

4. The PET foam sheet box making device according to claim 1, characterized in that: The sheet material preparation production line comprises: a feeding mechanism, a traction mechanism and a secondary foaming mechanism; The feeding mechanism is used to accommodate the rolled second sheet material, which is a PET foamed sheet material that has been foamed once. The traction mechanism is used to transport the second sheet material to the secondary foaming mechanism, and the secondary foaming mechanism is used to perform secondary foaming on the second sheet material to obtain the first sheet material.

5. The PET foam sheet box making device according to claim 4, characterized in that: The secondary foaming mechanism comprises: a second box, a pair of conveying components and a plurality of third heaters, and the two ends of the second box are respectively provided with a third inlet and a third outlet for the second sheet to pass through; A pair of the conveying components are relatively arranged in the second box body, and the pair of the conveying components are synchronously driven to convey the second sheet material. A plurality of the third heaters are arranged in the conveying components to allow the second sheet material to undergo secondary foaming in the second box body.

6. The PET foam sheet box-making device according to claim 5, characterized in that: The conveying assembly comprises: a plurality of rotating structures and a conveyor belt, wherein the conveyor belt is sleeved outside the plurality of rotating structures, and each of the rotating structures is provided with the third heater; Each of the rotating structures includes a plurality of second rollers and a frame. The second rotating shaft of each of the second rollers is rotatably connected to the frame. The conveyor belt is sleeved outside the plurality of second rollers.

7. The PET foam sheet box-making device according to claim 4, characterized in that: The traction mechanism includes: a second roller frame and a pair of third roller bodies, wherein the pair of third roller bodies are arranged opposite to the second roller frame, and the pair of third roller bodies rotate synchronously to convey the second sheet to the secondary foaming mechanism.

8. The PET foam sheet box-making device according to claim 7, characterized in that: The traction mechanism further includes a plurality of pairs of detection components and alarms, wherein the detection components are used to detect the position of the second sheet on the third roller body, and the plurality of pairs of detection components are respectively arranged on both sides of the second sheet; Each pair of the detection components includes: a limit block and a sensing block, the limit block is arranged on one side of the second sheet, and the sensing block is arranged on the second roller frame. When the distance between the limit block and the sensing block is less than a preset distance, the sensing block sends a signal to the alarm, and the alarm sounds an alarm.

9. The PET foam sheet box-making device according to claim 1, characterized in that: It also includes a material dropping mechanism, which is arranged downstream of the cutting knife along the conveying direction of the first sheet material; The blanking mechanism comprises: a third roller frame, a plurality of fourth roller bodies and a winch; The plurality of fourth roller bodies are rotatably arranged on the third roller frame, the fourth roller bodies are used for conveying the first sheet material after the cutting of the tailings, and the winch is used for winding up the tailings.

10. The PET foam sheet box-making device according to claim 9, characterized in that: It also includes a box stitching machine and a robot, wherein the box stitching machine is arranged downstream of the blanking mechanism along the conveying direction of the first sheet material, and the box stitching machine is used to stitch the first sheet material into a packaging box; The robot is used for palletizing the packaging boxes.

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