PET foaming sheet box manufacturing device

Abstract

The utility model relates to the technical field of foaming sheet box manufacturing, and provides a PET foaming 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 utility model relates to foamed sheet material box making technical field especially relates to a kind of PET foamed sheet material box making device. BACKGROUND

[0002] At present, PET foamed sheet material packaging box is usually completed in two parts, the first part is to prepare PET foamed sheet material, and the second part is to make box body indentation and cutting of PET foamed sheet material by die cutting machine. Since the two parts are produced separately, the production process is not continuous, and PET foamed sheet material cannot be cut under stable processing temperature, which changes the material properties, cannot guarantee the final toughness and strength of the material, and also causes excessive crystallization of the material, increases the waste rate in the process of box making and manufacturing cost. SUMMARY

[0003] The utility model provides a kind of PET foamed sheet material box making device to solve the defect that process temperature is unstable when PET foamed sheet material is die cut in prior art.

[0004] The utility model provides a kind of PET foamed sheet material box making device, it is characterized in that, including: sheet material preparation production line, uniform thickness mechanism and die cutting mechanism;The sheet material preparation production line is used to prepare first sheet material, and the first sheet material is PET foamed sheet material after twice foaming, the uniform thickness mechanism includes a plurality of first roller bodies, the interval between adjacent two first roller bodies is equal, a plurality of first roller bodies rotate synchronously to control the thickness of the first sheet material at preset thickness, and the first sheet material is transported to the die cutting mechanism;The die cutting mechanism includes: first box body, die cutting die, first heater and cutting knife, the both ends of the first box body are equipped with first import and first export for the first sheet material passing, 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 to make indentation to the first sheet material, the cutting knife is arranged outside the first box body, and the cutting knife is used to cut the first sheet material along the indentation.

[0005] According to the PET foamed sheet material box making device provided by the utility model, the uniform thickness mechanism further includes first roller holder, and the first shaft of a plurality of first roller bodies is rotatably connected with the first roller holder;The first shaft has a cavity, and the cavity is used to accommodate heat-conducting liquid.

[0006] According to the PET foamed sheet material box making device provided by the utility model, the uniform thickness mechanism further includes heat preservation cover, a plurality of first roller bodies are arranged in the heat preservation cover, the opposite sides of the heat preservation cover are equipped with second import and second export for the first sheet material passing, and the heat preservation cover is equipped with second heater.

[0007] The utility model provides a kind of PET foamed sheet box making device, the sheet preparation production line includes: feeding mechanism, traction mechanism and secondary foaming mechanism;The feeding mechanism is used to accommodate the second sheet of roll, the second sheet is the PET foamed sheet after first foaming, the traction mechanism is used to deliver the second sheet to the secondary foaming mechanism, the secondary foaming mechanism is used to the second sheet is second foamed, to obtain the first sheet.

[0008] The utility model provides a kind of PET foamed sheet box making device, and the secondary foaming mechanism includes: second box, a pair of conveying components and multiple third heaters, the both ends of the second box are equipped with third import and third export for the second sheet passes;A pair of the conveying components are oppositely arranged in the second box, a pair of the conveying components are synchronous transmission, to convey the second sheet, multiple the third heaters are arranged in the conveying component, so that the second sheet is second foamed in the second box.

[0009] The utility model provides a kind of PET foamed sheet box making device, and the conveying component includes: multiple rotating structures and conveying belt, the conveying belt is sleeved on multiple the rotating structure outside, each the rotating structure is provided with the third heater;Each the rotating structure includes multiple second roller bodies and frame, the second pivot of each the second roller body is rotatably connected with the frame, and the conveying belt is sleeved on multiple the second roller body outside.

[0010] The utility model provides a kind of PET foamed sheet box making device, and the traction mechanism includes: second roller frame and a pair of third roller bodies, a pair of the third roller bodies are oppositely arranged in the second roller frame, and a pair of the third roller bodies are synchronous rotation, to deliver the second sheet to the secondary foaming mechanism.

[0011] The utility model provides a kind of PET foamed sheet box making device, and the traction mechanism further includes multiple detection components and alarm, the detection component is used to detect the position of the second sheet on the third roller body, and multiple the detection components are respectively arranged on the both sides of the second sheet;Each the detection component includes: limit block and inductive block, the limit block is arranged on one side of the second sheet, and the inductive block is arranged on the second roller frame, when the distance between the limit block and the inductive block is less than preset distance, the inductive block sends signal to the alarm, and the alarm issues alarm.

[0012] The PET foamed sheet case manufacturing device further comprises a blanking mechanism, the blanking mechanism is arranged downstream of the cutting knife along the conveying direction of the first sheet, and the blanking mechanism comprises a third roller frame, a plurality of fourth roller bodies and a winch.

[0013] The PET foamed sheet case manufacturing device further comprises a nailing machine and a mechanical hand, the nailing machine is arranged downstream of the blanking mechanism along the conveying direction of the first sheet, the nailing machine is used for nailing the first sheet into a packaging box, and the mechanical hand is used for stacking the packaging boxes.

[0014] The PET foamed sheet case manufacturing device provided by the utility model can guarantee the uniform thickness of the first sheet after secondary foaming through the arrangement of the uniform-thickness mechanism, can avoid temperature loss of the first sheet when the first sheet is pressed through the arrangement of the first box body and the first heater, guarantees the stability of the physical properties of the first sheet, improves the toughness and strength of the first sheet, and further guarantees the quality of the packaging box after molding. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0016] Figure 1 It is the structure schematic view of the PET foamed sheet case manufacturing device provided by the utility model.

[0017] Figure 2 It is Figure 1 The structure schematic view of the secondary foaming mechanism shown in the utility model.

[0018] Figure 3 It is Figure 1 The structure schematic view of the blanking mechanism shown in the utility model.

[0019] Reference signs:

[0020] 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. Unloading mechanism; 61. Third roller frame; 62. Fourth roller body; 63. Winch; 7. Nailer; 8. Robot arm. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] The following is combined Figures 1-3 This invention describes a PET foam sheet box-making apparatus.

[0023] like Figure 1 As shown in the embodiment of this utility model, the 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 rollers 11, the distance between two adjacent first rollers 11 is equal, and the plurality of first rollers 11 rotate synchronously to control the thickness of the first sheet at a preset thickness and to convey the first sheet to the die-cutting mechanism. The die-cutting mechanism includes: a first housing 21, a die-cutting mold, a first heater, and a cutting blade 24. The die-cutting mold is disposed inside the first housing 21, the first heater is disposed inside the die-cutting mold, the die-cutting mold is used to indent the first sheet, and the cutting blade 24 is disposed outside the first housing 21 and is used to cut the first sheet along the indentation.

[0024] Specifically, the PET foamed sheet after the first foaming is subjected to the second foaming on the sheet preparation production line to become the PET foamed sheet after the second foaming, and a first sheet is obtained. Considering that there may be a problem of uneven foaming in the foaming process, the first sheet prepared may have uneven thickness. Based on this, the first sheet prepared is rolled after the plurality of first roller bodies 11, so that the thickness of the first sheet is uniform. In this embodiment, the number of the plurality of first roller bodies 11 can be at least two, the two first roller bodies 11 are oppositely arranged, and the distance between the two first roller bodies 11 is the preset thickness of the first sheet. When the first sheet passes through the two first roller bodies 11, the thickness of the first sheet can be controlled within the preset thickness range, and at the same time, the first sheet can be delivered to the die-cutting mechanism. Alternatively, the number of the plurality of first roller bodies 11 can also be three, the three first roller bodies 11 are arranged in an L-shaped structure, the distance between the two first roller bodies 11 in the vertical direction is equal to the distance between the two first roller bodies 11 in the horizontal direction, forming two sets of rolling structures, and the thickness of the first sheet is more uniform after passing through the two sets of rolling structures. Alternatively, the number of the first roller bodies 11 can also be an even number, that is, the first roller bodies 11 are divided into two rows, and each row has a plurality of first roller bodies 11. In this way, the contact area between the first roller bodies 11 and the first sheet can be increased, so that the thickness of the first sheet is more uniform. In this embodiment, the distance between the adjacent two first roller bodies 11 is adjustable, so that the thickness uniformizing mechanism can meet the preparation requirements of packaging boxes with different thicknesses. The thickness of the first sheet is 2mm-10mm, and correspondingly, the distance between the adjacent two first roller bodies 11 is also 2mm-10mm.

[0025] 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 to be indented, and the first sheet after indentation is delivered to the cutting knife 24 to be cut. In this embodiment, the cavity of the die-cutting die is the same as the preformed shape of the packaging box, and the die-cutting die is provided with a first heater, so that the material properties of the PET foamed sheet are stable during die-cutting and do not change. At the same time, the die-cutting die is arranged in the first box body 21, so that the heat is not quickly lost, and the temperature of the PET foamed sheet is constant during die-cutting, and the material properties do not change. The first sheet after indentation is delivered to the cutting knife 24, and is cut along the indentation by the cutting knife 24 to form the planar shape of the packaging box before binding.

[0026] The PET foamed sheet box preparation device provided in the embodiment of the utility model can guarantee the uniform thickness of the first sheet after the second foaming through the arrangement of the thickness uniformizing mechanism; the first box body and the first heater are arranged, so that the temperature loss of the first sheet can be avoided during indentation of the first sheet, the stability of the material properties of the first sheet is guaranteed, the toughness and strength of the first sheet are improved, and the quality of the packaging box after forming is guaranteed.

[0027] Further, in the embodiment of the utility model, the die cutting die includes: upper die 22 and lower die 23, first heater is set to lower die 23, and first heater is used to heat upper die 22 and lower die 23, in this embodiment, the temperature of upper die 22 and lower die 23 is controlled at 70 DEG C-100 DEG C, to avoid PET foamed sheet crystallization. Upper die 22 is driven by hydraulic cylinder and acts, and upper die 22 and lower die 23 design cutter die structure according to the box type of packaging box. Lower die 23 is equipped with injection molding hole, and the injection molding hole can spray safety mark, PET recyclable mark, this face upward and other reminding marks commonly used in packaging box on the first sheet when the first sheet is indented, to reduce the use of printing ink, reduce energy consumption, realize green environmental protection. Optionally, in the embodiment of the utility model, the forming time of stamping injection molding is 6s / mould-10s / mould. The first heater can be an electric heater.

[0028] As Figure 1 Indicated, in the embodiment of the utility model, the uniform thickness mechanism further includes first roller bracket 12, and the first pivot of multiple first roller bodies 11 is rotatably connected with first roller bracket 12, and the first pivot has a cavity, and the cavity is used to accommodate heat-conducting liquid.

[0029] Specifically, the cavity can be communicated with the oil tank through a pipeline, and a heater is arranged below the oil tank to keep the temperature of the heat-conducting oil within a certain range. When the first sheet enters between the multiple first roller bodies 11, in order to avoid that the temperature of the first sheet is too low, a heat-conducting liquid with a higher temperature is injected into the cavity of the first pivot to prevent the temperature of the first sheet from being too low and the physical properties from changing. Optionally, the heat-conducting liquid can be heat-conducting oil, and the temperature of the heat-conducting oil is 70 DEG C-100 DEG C.

[0030] Further, the uniform thickness mechanism further includes a heat preservation cover 13, and opposite sides of the heat preservation cover 13 are provided with a second inlet and a second outlet, so that the first sheet passes through the heat preservation cover 13. The multiple first roller bodies 11 and the first roller bracket 12 are arranged in the heat preservation cover 13, and a second heater is arranged in the heat preservation cover 13 to ensure that the temperature of the first sheet is constant and avoid that the temperature of the first sheet is lost to cause the physical properties to change. Optionally, the second heater can be an electric heater or a quartz heating tube.

[0031] In the embodiment of the utility model, by controlling the temperature of the heat-conducting oil and the temperature of the die cutting die to be 70 DEG C-100 DEG C, which is below the crystallization temperature of the PET foamed sheet, the brittle fracture caused by crystallization of the PET foamed sheet can be avoided, the quality of the final product is ensured, and the yield of the packaging box is improved.

[0032] As Figure 1As shown, in an embodiment of this utility model, 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 a roll of second sheet material. In this embodiment, the second sheet material is a PET foamed sheet material that has undergone primary foaming. The feeding mechanism 3 can be multiple roller frames. The roll of second sheet material is placed on the rotating shaft of the roller frame, and the traction mechanism transports the second sheet material to the secondary foaming mechanism 5. The second sheet material undergoes secondary foaming in the secondary foaming mechanism 5 to obtain the first sheet material.

[0033] 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 disposed opposite to each other on the second roller frame 41. The pair of third roller bodies 42 rotate synchronously to transport the second sheet into the secondary foaming mechanism 5.

[0034] Furthermore, the traction mechanism also includes multiple pairs of detection components and an alarm. The detection components are used to detect the position of the second sheet on the third roller 42. Each pair of detection components includes a limit block and a sensing block. The limit block is disposed on one side of the second sheet, and the sensing block is disposed 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.

[0035] Specifically, the length of the third roller 42 is greater than the width of the second sheet. When the second sheet is conveyed by a pair of third rollers 42, the position of the second sheet on the third roller 42 may shift. In this embodiment, there are two detection components. The two limiting blocks of the two detection components are respectively set on both sides of the second sheet, and the two sensing blocks of the two detection components are set opposite to each other on the second roller frame 41. During the conveying of the second sheet, if the position of the second sheet on the third roller 42 shifts, the distance between the limiting block on one side of the second sheet and the sensing block on the corresponding side will inevitably be less than a preset distance. At this time, the sensing block sends a signal to the alarm, the alarm sounds, and the position of the second sheet can be manually adjusted so that the second sheet can enter the secondary foaming mechanism 5.

[0036] like Figure 2 As shown, the secondary foaming mechanism includes: a second housing 51, a pair of conveying components, and multiple third heaters 55. The second housing 51 has a third inlet and a third outlet at both ends for the passage of the second sheet. The pair of conveying components are arranged opposite each other within the second housing 51, and the pair of conveying components drive synchronously to convey the second sheet. The multiple third heaters 55 are arranged within the conveying components to heat the second sheet, causing the second sheet to undergo secondary foaming within the second housing 51.

[0037] In an optional embodiment of the utility model, the conveying assembly can be a structure of synchronous wheel and synchronous belt, and the synchronous belt is driven to convey the second sheet.

[0038] In another optional embodiment of the utility model, the conveying assembly comprises a plurality of rotating structures and a conveying belt 52, the conveying belt 52 is sleeved on 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 100-130 DEG C. In this embodiment, a plurality of third heaters 55 are arranged on both sides of the second sheet to heat the second sheet simultaneously from top to bottom, thereby improving the heating efficiency and production efficiency. In this embodiment, in order to prevent the second sheet from being transversely shrunk due to heating, the conveying belt 52 is made of polytetrafluoroethylene conveying belt, which has good heat resistance and can ensure that the second sheet is evenly heated during conveying and no additional heat loss occurs.

[0039] Further, as shown in Figure 2 each rotating structure comprises a plurality of second roller bodies 53 and a frame 54, the second rotating shaft of each second roller body 53 is rotationally connected with the frame 54, and the conveying belt 52 is sleeved on the plurality of second roller bodies 53.

[0040] Specifically, in the embodiment shown in Figure 2 the frame 54 of the rotating structure above the second sheet is a rectangular frame, the upper side and the lower side of the rectangular frame are provided with a plurality of second roller bodies 53, and the plurality of second roller bodies 53 drive the conveying belt 52 to rotate when rotating. The frame 54 of the rotating structure below the second sheet is a trapezoidal frame, and the plurality of second roller bodies 53 are arranged on the upper side and the lower side of the trapezoidal frame, and the plurality of second roller bodies 53 drive the conveying belt 52 to rotate when rotating. The third heater is arranged on the frame 54.

[0041] It can be understood that the structures of the frames 54 on both sides of the second sheet can be the same or different, and the shapes of the frames 54 can be rectangular frames, trapezoidal frames or other shapes.

[0042] The second sheet enters the second box body 51 through the third inlet of the second box body 51, is foamed again in the second box body 51, and is conveyed to the thickness uniformizing mechanism through the third outlet of the second box body 51.

[0043] Optionally, the third heater can be an electric heater, which can be arranged on the frame 54; the third heater can also be a plurality of heating pipes, the rotating shaft of each second roller body 53 has a cavity, and high-temperature heat-conducting oil is arranged in the cavity to heat the second sheet.

[0044] In the embodiment of the utility model, through setting second box body 51 in secondary foaming mechanism 5, setting heat preservation cover 13 in uniform thickness mechanism, can make the heating temperature of PET foamed sheet always control above softening temperature, below crystallization temperature, reduced the reject rate in the process of making box.

[0045] In view of the fact that the thickness of PET foamed sheet is relatively thin and does not satisfy the thickness for use in packaging box, in actual use, the method of double-layer PET foamed sheet composite bonding is usually adopted to improve the thickness of packaging box, and this method has problems such as poor bonding, uneven thickness, etc., and after the packaging box is finally formed, cracking easily occurs at the bonding position when bearing pressure and stacking.

[0046] As shown in Figure 3 In the embodiment of the utility model, PET foamed sheet box making device further includes blanking mechanism 6. Along the conveying direction of first sheet, blanking mechanism 6 is located downstream of cutting knife 24, and the first sheet after marking is conveyed to cutting knife 24, and the edge corner excess material is cut off by cutting knife 24, and the edge corner excess material is tail material. Blanking mechanism 6 includes third roller frame 61, a plurality of fourth roller bodies 62 and winch 63. A plurality of fourth roller bodies 62 are rotatably arranged on third roller frame 61, and fourth roller body 62 is used for conveying the first sheet after cutting tail material, and the tail material is wound by winch 63.

[0047] As shown in Figure 1 In the embodiment of the utility model, PET foamed sheet box making device further includes nailing machine 7 and manipulator 8. Along the conveying direction of first sheet, nailing machine 7 is arranged downstream of blanking mechanism 6, and the first sheet after removing tail material is conveyed to nailing machine 7 by a plurality of fourth roller bodies 62, and the first sheet is stapled into packaging box by nailing machine 7. Manipulator 8 grabs and stacks the packaging box. Nailing machine 7 can staple the first sheet into the packaging box by laser welding or ultrasonic welding.

[0048] PET foamed sheet box making device further includes temperature control cabinet and electric control cabinet, temperature control cabinet is used for adjusting the temperature of each heater, and electric control cabinet is used for controlling the action or stopping action of traction mechanism, secondary foaming mechanism 5, uniform thickness mechanism, die cutting mechanism, blanking mechanism 6, nailing machine 7 and manipulator 8.

[0049] In the embodiment of the utility model, the second sheet in roll is arranged on the roller support, and when the pair of third roller bodies 42 rotates, the PET foamed sheet can be continuously conveyed, so that the PET foamed sheet passes through each station in turn, realizing continuous production, which not only ensures the stability of the physical properties of the PET foamed sheet, but also improves the production efficiency.

[0050] The PET foamed sheet material box manufacturing device provided by the embodiment of the utility model can make the thickness of the first sheet material be twice or more than twice of the thickness of the second sheet material by twice foaming of the PET foamed sheet material, can reduce the raw material cost of the box manufacturing to more than half of the original, and can make the first sheet material have lower density and better integrity by one-time stamping and setting of the first sheet material by the afterheat of the twice foaming, so that the first sheet material is smooth and beautiful in appearance; the number of repeated heating of the PET foamed sheet material is reduced, cold die cutting is changed into hot stamping, the stress is more uniform in the processing process, the toughness of the PET foamed sheet material is better, the waste rate in the production process is reduced, and the purpose of reducing the cost is achieved.

[0051] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A PET foamed sheet box making apparatus characterized by, The utility model relates to a sheet preparation production line, a thickness uniformizing mechanism and a die cutting mechanism. The sheet preparation production line is used for preparing a first sheet, the first sheet is a PET foamed sheet which is secondarily foamed, the thickness uniformizing mechanism comprises a plurality of first roller bodies, the interval between two adjacent first roller bodies is equal, and the plurality of first roller bodies rotate synchronously to control the thickness of the first sheet at a preset thickness and deliver the first sheet to the die cutting mechanism. The die cutting mechanism comprises a first box body, a die cutting die, a first heater and a cutting knife, two ends of the first box body 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 body, the first heater is arranged in the die cutting die, the die cutting die is used for making an 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. The thickness uniformizing mechanism further comprises a first roller frame, and first rotating shafts of the plurality of first roller bodies are rotationally connected to the first roller frame.

2. The PET foamed sheet case making apparatus according to claim 1, characterized by The first rotating shaft has a cavity for accommodating a heat-conducting liquid. The thickness uniformizing mechanism further comprises a heat preservation cover, the plurality of first roller bodies are arranged in the heat preservation cover, opposite sides of the heat preservation cover are provided with a second inlet and a second outlet for the first sheet to pass through, and the heat preservation cover is provided with a second heater.

3. The PET foamed sheet case making apparatus according to claim 1 or 2, characterized by, The sheet preparation production line comprises a feeding mechanism, a traction mechanism and a secondary foaming mechanism.

4. The PET foamed sheet case making apparatus according to claim 1, characterized by The feeding mechanism is used for accommodating a rolled second sheet, the second sheet is a PET foamed sheet which is first foamed, the traction mechanism is used for delivering the second sheet to the secondary foaming mechanism, and the secondary foaming mechanism is used for secondarily foaming the second sheet to obtain the first sheet. The secondary foaming mechanism comprises a second box body, a pair of conveying assemblies and a plurality of third heaters, 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.

5. The PET foamed sheet case making apparatus according to claim 4, wherein, The pair of conveying assemblies are oppositely arranged in the second box body, and the pair of conveying assemblies are synchronously driven to convey the second sheet, and the plurality of third heaters are arranged in the conveying assemblies to make the second sheet secondarily foam in the second box body. The conveying assembly comprises a plurality of rotating structures and a conveying belt, the conveying belt is sleeved on the plurality of rotating structures, and each rotating structure is provided with the third heater.

6. The PET foamed sheet case making apparatus according to claim 5, wherein, Each rotating structure comprises a plurality of second roller bodies and a frame, a second rotating shaft of each second roller body is rotationally connected to the frame, and the conveying belt is sleeved on the plurality of second roller bodies. The traction mechanism comprises a second roller frame and a pair of third roller bodies, the pair of third roller bodies are oppositely arranged in the second roller frame, and the pair of third roller bodies rotate synchronously to deliver the second sheet to the secondary foaming mechanism.

7. The PET foamed sheet case making apparatus according to claim 4, characterized by The traction mechanism further comprises a plurality of detection assemblies and an alarm, the detection assembly is used for detecting the position of the second sheet on the third roller body, and a plurality of detection assemblies are arranged on two sides of the second sheet, respectively.

8. The PET foamed sheet case making apparatus according to claim 7, wherein, ​ Each pair of the detection assemblies comprises a limiting block and a sensing block, the limiting block is arranged on one side of the second sheet, the sensing block is arranged on the second roller frame, when the distance between the limiting block and the sensing block is less than a preset distance, the sensing block sends a signal to the alarm, and the alarm gives an alarm.

9. The PET foamed sheet box making apparatus of claim 1, wherein, The blanking mechanism is arranged downstream of the cutting knife along the conveying direction of the first sheet. 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 to convey the first sheet after cutting the tail material, and the winch is used to wind the tail material.

10. The PET foamed sheet box making apparatus according to claim 9, wherein, The nailer and the manipulator are further included, the nailer is arranged downstream of the blanking mechanism along the conveying direction of the first sheet, the nailer is used to bind the first sheet into a packaging box, and the manipulator is used to stack the packaging boxes. The manipulator is used to stack the packaging boxes.

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