A forming device for a PP box

Abstract

The present invention discloses a forming device for a PP box, which relates to the technical field of injection molding. It includes a first chassis and a second chassis. A material pipe is installed on the top of the first chassis, and an installation box is provided on the second chassis. A top box is arranged on the top of the installation box. It further includes: an extrusion forming mechanism: The extrusion forming mechanism includes a support frame arranged on the top of the first chassis. A hopper is installed on the top of the support frame. The bottom of the hopper communicates with the inside of the material pipe. A spiral feeding rod is connected to the inner wall of the material pipe through a bearing, and a heating system is arranged on the outer wall of the material pipe. The forming device for a PP box provided by the present invention can preheat the injection mold, effectively avoiding the problem that the quality of the injection product is reduced due to the contact between the cold mold and the high-temperature melt.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly relates to a molding device for PP boxes. Background Art

[0002] The molding of PP boxes is mainly based on injection molding technology. This technology uses an injection molding machine to inject molten PP material (polypropylene) into a preset mold, and then through cooling and solidification, the material forms the required shape in the mold, and finally the finished PP box is obtained.

[0003] After the PP raw material is melted, as the temperature drops, the molecular chains gradually separate from the melt and form an orderly crystal. The degree of crystallization of polypropylene will directly affect its material properties. The higher the degree of crystallization, the corresponding increase in Young's modulus and tensile strength, but the impact resistance and toughness will weaken, and the material becomes brittle. On the contrary, a low degree of crystallization shows better impact resistance and toughness, but the tensile strength and Young's modulus will decrease.

[0004] However, when the traditional molding equipment for PP boxes is in use, the setting of the mold is relatively simple. Before starting to use, the mold is basically in a cold state. When the cold mold contacts the high-temperature melt, it will seriously affect the crystallization degree of PP and the quality of plastic parts. Therefore, there is an urgent need for a new molding equipment for PP boxes to solve the above problems;

[0005] For example: in the early stage of processing, the mold temperature is too low, far less than 40 degrees. When the relatively hot PP melt enters the cold mold, the gloss of the plastic parts will become poor. Among them, too high a temperature will also cause the plastic parts after injection to be prone to deformation. However, there is a cooling system connected to the mold. During the process of cooling and shaping the injection parts, the temperature of the mold will be reduced. Therefore, for the new molding equipment for PP boxes, it is mainly necessary to preheat the cold mold before work. Summary of the Invention

[0006] The present invention discloses a molding device for PP boxes, aiming to solve the technical problem that when the traditional molding equipment for PP boxes is in use, the setting of the mold is relatively simple. Before starting to use, the mold is basically in a cold state. When the cold mold contacts the high-temperature melt, it will seriously affect the crystallization degree of PP and the quality of plastic parts.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A forming device for a PP box, comprising a first chassis and a second chassis. A material pipe is installed on the top of the first chassis. An installation box is provided on the second chassis. A top box is provided on the top of the installation box. It further includes: - An extrusion forming mechanism: The extrusion forming mechanism includes a support frame provided on the top of the first chassis. A hopper is installed on the top of the support frame. The bottom of the hopper communicates with the inside of the material pipe. A spiral feeding rod is connected to the inner wall of the material pipe through a bearing. A heating system is provided on the outer wall of the material pipe. One end of the material pipe is installed with a motor. The output end of the motor is connected to one end of the spiral feeding rod. One end of the material pipe is provided with an extrusion head. First and second molds are respectively provided on the inner walls of both sides of the installation box. One end of the extrusion head communicates with the inside of the first mold. The first mold is fixedly connected to the installation box. The second mold is movably connected to the installation box.

[0009] A heat guiding mechanism: The heat guiding mechanism is used to guide the heat generated by the heating system; A preheating mechanism: The preheating mechanism includes two installation sleeve blocks symmetrically arranged on the inner wall of the installation box. The inner walls of both installation sleeve blocks are of a hollow structure. And equidistantly distributed spray pipes are inclinedly arranged on the outer walls of the opposite sides of both installation sleeve blocks. The spray pipes on both installation sleeve blocks are respectively directed towards the first mold and the second mold; A cooling mechanism: The cooling mechanism is respectively connected to the first mold and the second mold; A heat preservation mechanism: The heat preservation mechanism is arranged inside the top box; A blocking mechanism: The blocking mechanism is arranged on the second chassis.

[0010] In order to ensure that the raw materials can maintain an appropriate temperature and fluidity during transportation and plasticization, the heating system needs to be turned on to heat the material pipe before feeding the material. And in this solution, part of the heat generated by heating is guided to the two installation sleeve blocks in the preheating mechanism through the provided heat guiding mechanism. Before injection molding, the first mold and the second mold are kept in a separated state. The spray pipes on the two installation sleeve blocks can specifically preheat the cold first mold and the second mold, effectively avoiding the adverse effects after the cold first mold and the second mold come into contact with the high-temperature melt, and ensuring the quality of the injection-molded products.

[0011] In a preferred embodiment, the heat guiding mechanism includes an adapter rod disposed on one side of the support frame. One end of the adapter rod is provided with a mounting pad, and an air pump is disposed on the top outer wall of the mounting pad. The intake end of the air pump is installed with a mounting pipe, and the outlet end of the air pump is installed with a lead-out pipe. Three connectors are provided on the lead-out pipe, and each of the three connectors is connected to a guiding pipe. Two of the guiding pipes located at the two side positions are respectively connected to the two mounting sleeve blocks, and one of the guiding pipes located in the middle position is connected to the heat preservation mechanism. A connecting sleeve is provided at the gap of the heating system, and a cavity is formed between the connecting sleeve, the material pipe and the heating system. The outer wall of the connecting sleeve is provided with equally spaced narrow slits, and the mounting pipe is communicated with the interior of the cavity.

[0012] No heat insulation treatment is performed at the gap of the provided heating system, and the cavity formed between the connecting sleeve, the material pipe and the heating system also has a high-temperature heating effect. Through the guidance of the air pump, air can be pumped from the interior of the cavity through the mounting pipe, and the air enters through the dispersed narrow slits and is easily heated by the heating system to become high-temperature gas. Thus, it can be guided into the preheating mechanism and the heat preservation mechanism through the guiding pipe. By using the preheating process of the heating system for the material pipe, the first mold and the second mold are preheated synchronously with strong linkage and synchronism, avoiding the trouble of separate preheating for the two, and indirectly improving the processing efficiency.

[0013] In a preferred embodiment, the cooling mechanism includes a first water-cooling joint disposed on the outer wall of one side of the second chassis and a second water-cooling joint disposed on the outer wall of one side of the installation box. Cooling pipelines are provided on the inner walls of the first mold and the second mold. The first water-cooling joint is connected to the cooling pipeline in the second mold, and the second water-cooling joint is connected to the cooling pipeline in the first mold.

[0014] Both overcooling and overheating of the first mold and the second mold will affect the quality of the injection-molded product. The preheating mechanism can preheat the first mold and the second mold, solving the influence of overcooling of the first mold and the second mold. The provided water-cooling mechanism can cool the first mold and the second mold during the cooling and forming process, preventing them from reaching too high a temperature, and thus avoiding the adverse influence of overheating on the quality of the injection-molded product.

[0015] In a preferred embodiment, the heat preservation mechanism includes a mounting groove disposed inside the top box. The inner wall of the mounting groove is installed with a spiral plate, and the spiral plate and the mounting groove form a vortex channel. A plurality of air holes are provided on the bottom inner wall of the vortex channel, and a plurality of cushion pads are installed on the two inner walls of the vortex channel. The positions of the plurality of cushion pads correspond to those of the plurality of air holes one by one. A central guiding hole is provided at the central position of the vortex channel, and the central guiding hole is located directly above the first mold.

[0016] By means of the provided heat preservation mechanism, the hot air guided by the guide pipe can be introduced downward into the interior of the installation box along the path of the vortex channel, which is mainly used to improve the heat preservation effect on the outside of the first mold and the second mold after mold closing (after mold closing, the second mold is inserted into the interior of the first mold as an inner mold). Among them, the dispersed air holes can comprehensively heat and insulate the first mold and the second mold after mold closing, and the central guide hole heats and insulates the first mold exposed to the outside, ensuring that after the injection molding process starts, the temperature of the preheated first mold and the second mold will not drop, thereby assisting in ensuring the quality of the injection molded product.

[0017] In a preferred solution, the blocking mechanism includes mounting seats arranged on both sides of the top outer wall of the second base frame, and the same plug plate is slidably connected to the opposite side of the two mounting seats, and a baffle is provided on the bottom outer wall of the plug plate, and the baffle is arranged as a "冖" structure, and two connecting blocks are provided on the outer wall of one side of the plug plate, and telescopic rods are connected to the bottom outer walls of the two connecting blocks, and the outer wall of the piston rod of the telescopic rod is sleeved with a second return spring, and hooks are connected to the outer walls of both sides of the plug plate through hinges, and slots are provided on the outer walls of one side of the two mounting seats, and the hooks and the slots are adapted to each other.

[0018] The blocking mechanism can be used in conjunction with the preheating process before the injection molding operation. The staff presses the plug plate downward so that the baffle of the "冖" structure blocks the through-hole position inside the chassis. After blocking, the hook is hung in the slot on the mounting base to prevent the hot air in the preheating process from being cooled down by the external gas, thereby ensuring the preheating effect.

[0019] As can be seen from the above, a forming device for a PP box includes a first chassis and a second chassis. A material pipe is installed on the top of the first chassis, and an installation box is provided on the second chassis. A top box is provided on the top of the installation box. The device further includes: an extrusion forming mechanism: the extrusion forming mechanism includes a support frame arranged on the top of the first chassis. A hopper is installed on the top of the support frame. The bottom of the hopper communicates with the inside of the material pipe. A spiral feeding rod is connected to the inner wall of the material pipe through a bearing. A heating system is provided on the outer wall of the material pipe. One end of the material pipe is installed with a motor, and the output end of the motor is connected to one end of the spiral feeding rod. An extrusion head is provided at one end of the material pipe. A first mold and a second mold are respectively provided on the inner walls of both sides of the installation box. One end of the extrusion head communicates with the inside of the first mold. The first mold is fixedly connected to the installation box, and the second mold is movably connected to the installation box; a heat guiding mechanism: the heat guiding mechanism is used to guide the heat generated by the heating system; a preheating mechanism: the preheating mechanism includes two installation sleeve blocks symmetrically arranged on the inner wall of the installation box. The inner walls of both installation sleeve blocks are of a hollow structure, and spray pipes are inclined and evenly distributed on the outer walls of the opposite sides of both installation sleeve blocks. The spray pipes on the two installation sleeve blocks respectively face the first mold and the second mold; a cooling mechanism: the cooling mechanism is respectively connected to the first mold and the second mold; a heat preservation mechanism: the heat preservation mechanism is arranged inside the top box; a plugging mechanism: the plugging mechanism is arranged on the second chassis. The forming device for a PP box provided by the present invention can preheat the injection mold, effectively avoiding the problem that the quality of the injection product is reduced due to the contact between the cold mold and the high-temperature melt. Description of the Drawings

[0020] Figure 1 Fig. is a schematic diagram of the overall structure of a forming device for a PP box proposed by the present invention.

[0021] Figure 2 Fig. is a side view of a forming device for a PP box proposed by the present invention.

[0022] Figure 3 Fig. is a structural diagram of the installation pipe installation of a forming device for a PP box proposed by the present invention.

[0023] Figure 4 Fig. is a side view sectional view of the material pipe of a forming device for a PP box proposed by the present invention.

[0024] Figure 5 Fig. is a side view sectional view of the installation box of a forming device for a PP box proposed by the present invention.

[0025] Figure 6 Fig. is a schematic diagram of the installation structure of the installation sleeve block of a forming device for a PP box proposed by the present invention.

[0026] Figure 7 Schematic diagram of the nozzle installation structure of a forming device for a PP box proposed by the present invention.

[0027] Figure 8 Schematic diagram of the installation structure of a spiral plate of a forming device for a PP box proposed by the present invention.

[0028] Figure 9 Schematic diagram of the baffle installation structure of a forming device for a PP box proposed by the present invention.

[0029] In the figure: 1, first chassis; 2, second chassis; 3, conveyor belt; 4, installation box; 5, top box; 6, support frame; 7, hopper; 8, material pipe; 9, motor; 10, heating system; 11, guiding pipe; 12, extrusion head; 14, first water-cooling joint; 15, second water-cooling joint; 16, connecting sleeve; 17, installation pipe; 18, air pump; 19, outlet pipe; 20, connecting rod; 21, spiral feeding rod; 22, cavity; 23, first mold; 24, second mold; 25, installation sleeve block; 26, spiral plate; 27, support plate; 28, first return spring; 29, nozzle; 30, air hole; 31, cushion; 32, central guiding hole; 33, installation seat; 34, insertion plate; 35, connecting block; 36, telescopic rod; 37, second return spring; 38, hook; 39, clamping groove; 40, baffle. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] A forming device for a PP box disclosed by the present invention is mainly applied to the scenario where in the use of a traditional forming device for a PP box, the setting of the mold is relatively simple. Before starting to use, the mold is basically in a cold state. When the cold mold comes into contact with the high-temperature melt, it will seriously affect the crystallization degree of PP and the quality of the plastic part. Therefore, there is an urgent need for a new forming device for a PP box to solve the above problems.

[0032] Refer to Figures 1 to 9, A forming device for a PP box, comprising a first chassis 1 and a second chassis 2. A material pipe 8 is installed on the top of the first chassis 1. An installation box 4 is provided on the second chassis 2. A top box 5 is provided on the top of the installation box 4. It further includes: - Extrusion forming mechanism: The extrusion forming mechanism includes a support frame 6 provided on the top of the first chassis 1. A hopper 7 is installed on the top of the support frame 6. The bottom of the hopper 7 communicates with the inside of the material pipe 8. A spiral feeding rod 21 is connected to the inner wall of the material pipe 8 through a bearing. A heating system 10 is provided on the outer wall of the material pipe 8. One end of the material pipe 8 is installed with a motor 9. The output end of the motor 9 is connected to one end of the spiral feeding rod 21. One end of the material pipe 8 is provided with an extrusion head 12. On the two inner walls of the installation box 4, a first mold 23 and a second mold 24 are respectively provided. One end of the extrusion head 12 communicates with the inside of the first mold 23. The first mold 23 is fixedly connected to the installation box 4. The second mold 24 is movably connected to the installation box 4. - Heat guiding mechanism: The heat guiding mechanism is used to guide the heat generated by the heating system 10. - Preheating mechanism: The preheating mechanism includes two installation sleeve blocks 25 symmetrically provided on the inner wall of the installation box 4. The inner walls of the two installation sleeve blocks 25 are of hollow structure, and on the outer walls of the opposite sides of the two installation sleeve blocks 25, spray pipes 29 are inclined and evenly distributed. The spray pipes 29 on the two installation sleeve blocks 25 respectively face the first mold 23 and the second mold 24. - Cooling mechanism: The cooling mechanism is respectively connected to the first mold 23 and the second mold 24. - Heat preservation mechanism: The heat preservation mechanism is provided inside the top box 5. - Sealing mechanism: The sealing mechanism is provided on the second chassis 2.

[0033] During the actual use process, in order to ensure that the raw materials can maintain appropriate temperature and fluidity during transportation and plasticization, the heating system 10 needs to be turned on to heat the material pipe 8 before feeding the material. And in this solution, part of the heat generated by heating is guided to the two installation sleeve blocks 25 in the preheating mechanism through the provided heat guiding mechanism. Before injection molding, the first mold 23 and the second mold 24 are kept in a separated state. The spray pipes 29 on the two installation sleeve blocks 25 can specifically preheat the cold first mold 23 and second mold 24, effectively avoiding the adverse effects after the cold first mold 23 and second mold 24 come into contact with the high-temperature melt, and ensuring the quality of the injection-molded products.

[0034] Among them, the spray pipes 29 on the two installation sleeve blocks 25 are opposite and staggered. When the spray pipes 29 on the two installation sleeve blocks 25 jet air, the hot air jetted by the spray pipes 29 on both sides will not interfere with each other.

[0035] Refer to Figure 3 、 Figure 4 、 Figure 6 and Figure 7, in a preferred embodiment, the heat guiding mechanism includes an adapter rod 20 disposed on one side of the support frame 6. One end of the adapter rod 20 is provided with a mounting pad, and an air pump 18 is provided on the top outer wall of the mounting pad. An installation pipe 17 is installed at the intake end of the air pump 18, and an outlet pipe 19 is installed at the outlet end of the air pump 18. Three connectors are provided on the outlet pipe 19, and all three connectors are connected to a guiding pipe 11. Two of the guiding pipes 11 located on both sides are respectively connected to two mounting sleeve blocks 25, and one of the guiding pipes 11 located in the middle is connected to the heat preservation mechanism. A connecting sleeve 16 is provided at the gap of the heating system 10, and a cavity 22 is formed between the connecting sleeve 16, the material pipe 8 and the heating system 10. Equally spaced slits are formed on the outer wall of the connecting sleeve 16, and the installation pipe 17 is communicated with the inside of the cavity 22.

[0036] Specifically, no heat insulation treatment is performed at the gap of the provided heating system 10, and the cavity 22 formed between the connecting sleeve 16, the material pipe 8 and the heating system 10 also has a high-temperature heating effect. Through the guidance of the air pump 18, air can be extracted from the inside of the cavity 22 through the installation pipe 17, and the gas enters through the dispersed slits and is easily heated by the heating system 10 to become high-temperature gas. Thus, it can be guided into the preheating mechanism and the heat preservation mechanism through the guiding pipe 11. During the preheating process of the material pipe 8 by the heating system 10, the first mold 23 and the second mold 24 are preheated synchronously, with strong linkage and synchronism, avoiding the trouble of separate preheating of the two, and indirectly improving the processing efficiency.

[0037] Refer to Figure 2 、 Figure 5 and Figure 6 , in a preferred embodiment, the cooling mechanism includes a first water cooling joint 14 disposed on the outer wall of the second chassis 2 and a second water cooling joint 15 disposed on the outer wall of the installation box 4. Cooling pipelines are provided on the inner walls of both the first mold 23 and the second mold 24. The first water cooling joint 14 is connected to the cooling pipeline in the second mold 24, and the second water cooling joint 15 is connected to the cooling pipeline in the first mold 23.

[0038] Specifically, both overcooling and overheating of the first mold 23 and the second mold 24 will affect the quality of the injection molded product. The preheating mechanism can be used to preheat the first mold 23 and the second mold 24, solving the influence of overcooling of the first mold 23 and the second mold 24. The provided water cooling mechanism can cool the first mold 23 and the second mold 24 during the cooling and forming process, preventing them from reaching too high a temperature, and thus avoiding the adverse influence of overheating on the quality of the injection molded product.

[0039] Refer to Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 and Figure 8In a preferred embodiment, the heat preservation mechanism includes a mounting groove arranged inside the top box 5, a vortex plate 26 is installed on the inner wall of the mounting groove, the vortex plate 26 and the mounting groove form a vortex channel, a plurality of air holes 30 are provided on the bottom inner wall of the vortex channel, a plurality of baffles 31 are installed on the inner walls on both sides of the vortex channel, the plurality of baffles 31 correspond to the positions of the plurality of air holes 30 one by one, a central guide hole 32 is provided at the central position of the vortex channel, and the central guide hole 32 is located directly above the first mold 23.

[0040] By means of the provided heat preservation mechanism, the hot air guided by the guide tube 11 can be introduced downwardly into the interior of the installation box 4 along the path of the vortex channel, which is mainly used to improve the heat preservation effect on the outside of the first mold 23 and the second mold 24 when the mold is closed (after the mold is closed, the second mold 24 is inserted into the interior of the first mold 23 as an inner mold). Among them, the dispersed air holes 30 can comprehensively heat and insulate the first mold 23 and the second mold 24 after the mold is closed, and the central guide hole 32 heats and insulates the first mold 23 exposed to the outside, thereby ensuring that after the injection molding process starts, the temperature of the preheated first mold 23 and the second mold 24 will not drop, thereby helping to ensure the quality of the injection molded product.

[0041] In particular, a cover plate is provided on the top outer wall of the top box 5, a handle is provided on one side outer wall of the top box 5, and a mounting joint is provided on one side outer wall of the top box 5, one of the guide tubes 11 is adapted to the mounting joint, and the top box 5 is connected to one side of the top outer wall of the installation box 4 by a hinge, wherein the entire top box 5 is connected to the top of the installation box 4 by a hinge, serving as a cover of the installation box 4, and when the first mold 23 and the second mold 24 need to be replaced and repaired, the entire top box 5 can be opened by the handle for disassembly and replacement, and in this process, one of the guide tubes 11 connected to the top box 5 can be removed from the mounting joint first to avoid the guide tube 11 being pulled and broken.

[0042] Reference Figure 1 , Figure 2 and Figure 9 In a preferred embodiment, the blocking mechanism includes mounting seats 33 arranged on both sides of the top outer wall of the second base frame 2, and the same plug plate 34 is slidably connected to the opposite side of the two mounting seats 33, and a baffle 40 is provided on the bottom outer wall of the plug plate 34, and the baffle 40 is set to a "冖" structure, and two connecting blocks 35 are provided on the outer wall of one side of the plug plate 34, and the bottom outer walls of the two connecting blocks 35 are connected to telescopic rods 36, and the outer wall of the piston rod of the telescopic rod 36 is sleeved with a second return spring 37, and the outer walls of both sides of the plug plate 34 are connected with hooks 38 through hinges, and the outer walls of one side of the two mounting seats 33 are provided with card slots 39, and the hooks 38 and the card slots 39 are adapted to each other.

[0043] Specifically, the blocking mechanism can be used in conjunction with the preheating process before the injection molding operation. The staff presses the plug plate 34 downward so that the baffle 40 of the "冖" structure blocks the through-hole position inside the chassis. After blocking, the hook 38 is hooked into the slot 39 on the mounting seat 33 to prevent the hot air in the preheating process from being cooled by the external gas, thereby ensuring the preheating effect.

[0044] Reference Figure 1 , Figure 2 and Figure 3 In a preferred embodiment, a conveyor belt 3 is installed on the inner wall of the second base frame 2, and a support plate 27 is connected to the inner wall of one side of the second base frame 2 through a hinge. A row of first return springs 28 are provided on the bottom outer wall of the support plate 27, and the bottom end of the support plate 27 is higher than the upper plane of the conveyor belt 3, and the baffle 40 is adapted to the conveyor belt 3.

[0045] The support plate 27 can cooperate with the first return spring 28 to play an elastic buffering effect, thereby preventing the newly-injected product from hard collision with the support plate 27 after demoulding, thereby ensuring product quality to a certain extent.

[0046] Working principle: When in use, first separate the first mold 23 and the second mold 24 from each other, then turn on the heating system 10 on the outer wall of the material tube 8, and the heating system 10 starts to preheat the material tube 8. During this process, through the guidance of the air pump 18, air can be evacuated from the inside of the cavity 22 through the mounting tube 17, and the gas enters through the dispersed slits, and is easily heated by the heating system 10 to become a high-temperature gas, so that it can be guided into the preheating mechanism and the heat preservation mechanism through the guide tube 11. The heating system 10 is used to preheat the material tube 8, and the first mold 23 and the second mold 24 are preheated synchronously, and then the dried PP raw material is poured into the hopper 7, and the first mold 23 and the second mold 24 are closed at the same time, and the motor 9 is started to drive the spiral feeding rod 21 to feed the material. During this process, the PP raw material will be heated to a melt at a high temperature, and finally extruded into the closed mold of the first mold 23 and the second mold 24 through the extruder head 12, and then cooled and formed by the cooling mechanism, and finally transported and exported through the conveyor belt 3.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PP box forming device, comprising a first base frame (1) and a second base frame (2), wherein a material pipe (8) is installed on the top of the first base frame (1), an installation box (4) is provided on the second base frame (2), and a top box (5) is provided on the top of the installation box (4), characterized in that: Also includes: Extrusion molding mechanism: The extrusion molding mechanism comprises a support frame (6) arranged on the top of the first base frame (1), a hopper (7) is installed on the top of the support frame (6), the bottom of the hopper (7) is communicated with the inside of the material pipe (8), a spiral feeding rod (21) is connected to the inner wall of the material pipe (8) through a bearing, a heating system (10) is provided on the outer wall of the material pipe (8), a motor (9) is installed at one end of the material pipe (8), the output end of the motor (9) is connected to one end of the spiral feeding rod (21), an extrusion head (12) is provided at one end of the material pipe (8), a first mold (23) and a second mold (24) are respectively provided on the inner walls of both sides of the installation box (4), one end of the extrusion head (12) is communicated with the inside of the first mold (23), the first mold (23) is fixedly connected to the installation box (4), and the second mold (24) is movably connected to the installation box (4); Preheating mechanism: the preheating mechanism comprises two mounting blocks (25) symmetrically arranged on the inner wall of the mounting box (4), the inner walls of the two mounting blocks (25) are both hollow structures, and nozzles (29) are obliquely arranged on the outer walls of the two mounting blocks (25) on opposite sides and distributed at equal distances, the nozzles (29) located on the two mounting blocks (25) are respectively directed toward the first mold (23) and the second mold (24); A heat guiding mechanism: the heat guiding mechanism is used to guide the heat generated by the heating system (10), the heat guiding mechanism comprises a connecting rod (20) arranged on one side of the support frame (6), a mounting pad is arranged at one end of the connecting rod (20), an air pump (18) is arranged on the top outer wall of the mounting pad, a mounting pipe (17) is arranged on the air inlet end of the air pump (18), an outlet pipe (19) is arranged on the air outlet end of the air pump (18), three joints are arranged on the outlet pipe (19), and the three joints are all connected to a guide pipe (11), wherein two guide pipes (11) located at two sides are respectively connected to two mounting sleeve blocks (25), a connecting sleeve (16) is arranged at the gap of the heating system (10), a cavity (22) is formed between the connecting sleeve (16), the material pipe (8) and the heating system (10), and fine slits distributed at equal distances are opened on the outer wall of the connecting sleeve (16), and the mounting pipe (17) is connected to the inside of the cavity (22); Cooling mechanism: the cooling mechanism is connected to the first mold (23) and the second mold (24) respectively; Heat preservation mechanism: The heat preservation mechanism is arranged inside the top box (5). The heat preservation mechanism includes an installation groove arranged inside the top box (5). The inner wall of the installation groove is provided with a spiral plate (26). The spiral plate (26) and the installation groove form an eddy current channel. A plurality of air holes (30) are arranged on the bottom inner wall of the eddy current channel. A plurality of cushion pads (31) are installed on the two side inner walls of the eddy current channel. The positions of the plurality of cushion pads (31) correspond to those of the plurality of air holes (30) one by one. A central guide hole (32) is arranged at the central position of the eddy current channel. The central guide hole (32) is located directly above the first mold (23). A cover plate is arranged on the top outer wall of the top box (5). A handle is arranged on one side outer wall of the top box (5). And an installation joint is arranged on one side outer wall of the top box (5). One of the guiding pipes (11) is adapted to the installation joint. The top box (5) is connected to one side of the top outer wall of the installation box (4) through a hinge. One of the guiding pipes (11) located in the middle position is connected to the heat preservation mechanism; Sealing mechanism: The sealing mechanism is arranged on the second chassis (2).

2. A PP box forming device according to claim 1, characterized in that: The spray pipes (29) located on the two installation sleeve blocks (25) are opposite and staggered.

3. A PP box forming device according to claim 1, characterized in that: The cooling mechanism includes a first water cooling joint (14) arranged on one side outer wall of the second chassis (2) and a second water cooling joint (15) arranged on one side outer wall of the installation box (4). Cooling pipelines are arranged on the inner walls of the first mold (23) and the second mold (24). The first water cooling joint (14) is connected to the cooling pipeline in the second mold (24). The second water cooling joint (15) is connected to the cooling pipeline in the first mold (23).

4. A PP box forming device according to claim 1, characterized in that: The sealing mechanism includes mounting seats (33) arranged on both sides of the top outer wall of the second chassis (2). The same plug board (34) is slidably connected to the opposite sides of the two mounting seats (33). A baffle (40) is arranged on the bottom outer wall of the plug board (34). The baffle (40) is arranged in a "冖" structure.

5. A PP box forming device according to claim 4, characterized in that: Two connecting blocks (35) are arranged on one side outer wall of the plug board (34). Expansion rods (36) are connected to the bottom outer walls of the two connecting blocks (35). A second return spring (37) is sleeved on the piston rod outer wall of the expansion rod (36). Hooks (38) are connected to both side outer walls of the plug board (34) through hinges. Card slots (39) are arranged on one side outer walls of the two mounting seats (33). The hooks (38) and the card slots (39) are adapted to each other.

6. A PP box forming device according to claim 5, characterized in that: A conveyor belt (3) is installed on the inner wall of the second chassis (2). A support plate (27) is connected to one side inner wall of the second chassis (2) through a hinge. A row of first return springs (28) are arranged on the bottom outer wall of the support plate (27). The bottom end of the support plate (27) is higher than the upper plane of the conveyor belt (3). The baffle (40) is adapted to the conveyor belt (3).

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