Automatic production line for high-flame-retardant PET insulating sleeve

Abstract

The invention relates to an automatic production line for a high-flame-retardant PET insulating sleeve, and belongs to the technical field of PET insulating sleeve production, the automatic production line comprises a device main body, the device main body comprises a feeding cylinder and a screw extruder, the screw extruder is arranged on a discharging path of the feeding cylinder, a preheating assembly is arranged in the feeding cylinder, and the preheating assembly is arranged in the discharging path of the feeding cylinder. An adjusting cylinder is arranged on one side of the screw extruder, a conveying opening is formed in the inner wall of the feeding cylinder, and the adjusting cylinder conveys recycled heat to the conveying opening through a preheating assembly; an air supply assembly is arranged in the feeding cylinder, and a fixing rod is arranged on the inner wall of the feeding cylinder. According to the heat conveying pipe and the conveying opening, when the screw extruder is used for heating extrusion molding of insulation pipe production raw materials, the valve arranged on the outer wall of the heat conveying pipe is opened, heat is conveyed into the first heat storage pipe in the feeding cylinder, and the heat is conveyed into the feeding cylinder through the conveying opening; the raw materials in the feeding cylinder are preheated, stirred and discharged.

Description

Technical Field

[0001] The present invention relates to the technical field of PET insulating sleeve production, and more specifically, to an automated production line for high-flame-retardant PET insulating sleeves. Background Art

[0002] An insulating sleeve is a product used for electrical insulation protection, made of a material that resists UV, cold, corrosion, and wear. The inside of the insulating sleeve can cover wires and cables, preventing them from being affected by mechanical damage, oxidation, corrosion, etc. During the production and processing of insulating sleeves, an automated production equipment is required to perform production and processing operations on the insulating sleeves.

[0003] In the prior art, there is an insulating sleeve packaging production line and its control and use method with the publication number CN119240105A. The production line includes a feeding system, a detection system, a cutting and pulling tube system, a conveying system, a waste collection system, and a bundling and packing system. The insulating sleeve is conveyed to the detection system through the feeding system. When the detection system detects a qualified product, the qualified product is pulled to the conveying system through the cutting and pulling tube system and is packed through the bundling and packing system. When the detection system detects a defective product, it is cut separately in the cutting and pulling tube system and the waste is collected through the waste collection system. This invention can detect the defects of the sleeve itself. The detection device uses sensors to detect defective sleeves without manual intervention and without damaging the sleeves while the packaging line is running, achieving quality control of the sleeves in an automated manner, improving the detection accuracy, and saving a large amount of manpower and material resources.

[0004] In the prior art, there is a raw material mixing and stirring device for producing glass fiber insulating sleeves with the publication number CN217340897U. The device includes a stirring barrel. Heating layers are embedded in the middle positions on both sides of the inner wall of the stirring barrel. A discharge hopper is arranged at the bottom of the stirring barrel. A stirring assembly is arranged in the middle of the stirring barrel. A motor is installed on one side of the top of the stirring barrel, and a feeding hopper is fixed on the side of the top of the stirring barrel away from the motor. By starting the motor and using the cooperation of the driving bevel gear, upper bevel gear, lower bevel gear, etc., the outer tube and the inner rod are rotated simultaneously, so that the outer tube rotates clockwise and drives the stirring rod and the scraper to rotate synchronously to stir the materials in the barrel and scrape off the materials attached to the inner wall of the barrel. At the same time, the inner rod rotates counterclockwise and conveys the materials at the bottom of the barrel upward through the spiral blades arranged on the rod body to prevent the raw materials from piling up and avoid uneven mixing.

[0005] However, when the existing automated production equipment is in use, although it can perform a series of complete automated production operations on the insulating sleeve relatively well, when the insulating sleeve is extruded and formed by a screw extruder, the multi-path recycling effect of the heat generated by the extruder is not high. Moreover, when recovering heat, the sufficient preheating effect of the insulating sleeve raw material in the feeding cylinder is not high, resulting in a relatively long time for the insulating sleeve at room temperature to be thermoplastically softened in the extruder, reducing the processing efficiency of the equipment for the insulating sleeve. Also, when recycling heat, the hardening synchronization of the cutting area of the insulating sleeve by the cutting knife is not high, causing wrinkles to appear at the cutting part of the insulating sleeve due to the softness of the insulating sleeve during cutting, reducing the production and forming quality of the insulating sleeve, with many defective products, increasing the production cost of the insulating sleeve, and not meeting people's usage requirements. Therefore, we propose an automated production line for high-flame-retardant PET insulating sleeves. Summary of the Invention

[0006] To solve the problems mentioned in the above background, the present invention provides an automated production line for high-flame-retardant PET insulating sleeves to solve the problems of low multi-path recycling effect of the heat generated by the extruder, and when recovering heat, the insufficient preheating effect of the insulating sleeve raw material in the feeding cylinder, resulting in a relatively long time for the insulating sleeve at room temperature to be thermoplastically softened in the extruder, reducing the processing efficiency of the equipment for the insulating sleeve, and the low hardening synchronization of the cutting area of the insulating sleeve by the cutting knife, causing wrinkles to appear at the cutting part of the insulating sleeve due to the softness of the insulating sleeve during cutting, reducing the production and forming quality of the insulating sleeve as mentioned in the above background technology.

[0007] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows: An automated production line for high-flame-retardant PET insulating sleeves, including a device main body. The device main body includes a feeding cylinder and a screw extruder. The screw extruder is arranged on the feeding path of the feeding cylinder. A preheating assembly is arranged inside the feeding cylinder. An adjusting cylinder is arranged on one side of the screw extruder. A conveying port is opened on the inner wall of the feeding cylinder. The adjusting cylinder conveys the recovered heat to the conveying port through the preheating assembly. A gas supply assembly is arranged inside the feeding cylinder. A fixing rod is arranged on the inner wall of the feeding cylinder. A stirring rod is fixedly connected to the outer wall of the fixing rod. Air holes are opened on the surface of the stirring rod. The feeding cylinder conveys gas to the air holes through the gas supply assembly. With the provided heat transfer pipe and conveying port, when heating and extruding the raw material of the insulating pipe through the screw extruder, by opening the valve arranged on the outer wall of the heat transfer pipe, the heat is conveyed into the first heat storage pipe inside the feeding cylinder, and through the opening of the conveying port, the heat is conveyed into the feeding cylinder to preheat, stir, and feed the raw material inside the feeding cylinder.

[0008] Preferably, a feeding port is provided at the top of the screw extruder and is located below the feeding barrel. An extrusion die is provided on the outer wall of the device body and is located at one end of the screw extruder. A traction frame is provided on the outer wall of the device body and is located on one side of the extrusion die. A heat transfer pipe fixedly connected to the outer wall of the adjustment cylinder is fixedly connected to the outer wall of the screw extruder. A return pipe fixedly connected to the outer wall of the feeding barrel is fixedly connected to the outer wall of the adjustment cylinder, which plays a role in recycling the heat generated by the screw extruder through multiple paths.

[0009] Preferably, the preheating assembly includes a first heat storage pipe, a second heat storage pipe, a through pipe, and a heat transfer cavity. One end of the return pipe is fixedly connected to the first heat storage pipe provided inside the feeding barrel. The through pipe is fixedly connected to the outer wall of the first heat storage pipe. The second heat storage pipe is fixedly connected to the outer wall of the through pipe. A filter screen is provided on the inner wall of the feeding port, so that the transferred heat is transferred into the second heat storage pipe through the first heat storage pipe, achieving the effect of covering the inner wall of the feeding barrel with heat in all directions, playing a role in improving the full heating and stirring of the raw materials, and through the setting of the filter screen, playing a role in effectively blocking the raw materials for stirring and feeding.

[0010] Preferably, both the first heat storage pipe and the second heat storage pipe are annularly arranged in the feeding barrel, and a connection cavity is provided at the connection part between the inner wall of the feeding barrel and the first heat storage pipe. The first heat storage pipe and the second heat storage pipe are interconnected through the through pipe, playing a role in evenly transferring the recovered heat to the inner wall of the feeding barrel and improving the all-round preheating use inside the feeding barrel.

[0011] Preferably, the air supply assembly includes an annular pipe and an air supply pipe. A grid-shaped connection frame is fixedly connected to the top of the feeding barrel. A stirring motor is fixedly connected to the top of the connection frame. The output end of the stirring motor is fixedly connected to a connection column fixedly connected to the outer wall of the fixed rod. An air supply cavity communicating with the air supply hole is provided inside the fixed rod. The annular pipe is embedded in the inner side wall of the connection column. The air supply pipe fixedly connected to the outer wall of the annular pipe is connected to an external air supply device through a booster pump. The provided through pipe enables the transferred heat to be transferred into the second heat storage pipe through the first heat storage pipe, achieving the effect of covering the inner wall of the feeding barrel with heat in all directions, playing a role in improving the full heating and stirring of the raw materials.

[0012] Preferably, the connection column and the annular pipe are rotatably connected, and a through hole located above the air supply cavity is provided at the bottom of the annular pipe, playing a role in maintaining the use stability of the annular pipe.

[0013] Preferably, a connection box is fixedly connected to the outer wall of the adjusting cylinder, a servo motor is fixedly connected to the outer wall of the connection box, an output end of the servo motor is fixedly connected to a worm that is rotatably connected to the inner wall of the connection box, a worm gear is meshed with the outer wall of the worm, a conversion cylinder that is rotatably connected to the inner wall of the adjusting cylinder is fixedly connected to a rotation center of the worm gear through a rotating shaft, a connection pipe is fixedly connected to the outer wall of the adjusting cylinder, and a heat delivery nozzle is fixedly connected to one end of the connection pipe. When a gas delivery cavity is provided and an insulating pipe raw material in a feeding cylinder is stirred and fed by a stirring rod, in order to improve the sufficient heating effect of the raw material in the cylinder, gas is delivered into the gas delivery cavity through a through hole formed in an outer wall of an annular pipe through a gas delivery pipe, and the gas is delivered through a gas delivery hole formed in an upper outer wall of the stirring rod, so as to play a role in improving the heating uniformity of the raw material in the cylinder and improving the heating efficiency of the raw material in the extruder.

[0014] Preferably, a connection hole with a T-shaped cross section is formed in an outer wall of the conversion cylinder, and the connection holes formed in a surface of the conversion cylinder are respectively arranged corresponding to a return pipe, a connection pipe, and a heat delivery pipe, so as to play a role in conveniently converting a heat delivery path of the recovered heat for use.

[0015] Preferably, an electric push rod is fixedly connected to an outer wall of the device main body, a lifting rod that is slidably connected to the outer wall of the device main body is fixedly connected to one end of the electric push rod, a cutting tool body is rotatably connected to an outer wall of the lifting rod through a control motor, and an insulating pipe body penetrates through an outer wall of the extrusion die. When the heat of the extruder is recovered and used, the recovered heat is blown to a cutting part of the insulating pipe through the heat delivery nozzle by adjusting the conversion cylinder, so as to reduce the situation that the insulating pipe is wrinkled due to softening during cutting.

[0016] Preferably, the heat delivery nozzle is arranged on a movement track of the cutting tool body, and the heat delivery nozzle is arranged in an inclined shape, so that the recovered heat is blown to a cutting part of the insulating pipe through the heat delivery nozzle, and the situation that the insulating pipe is wrinkled due to softening during cutting is reduced.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The heat delivery pipe and delivery ports provided in the present invention, when heating and extruding a production raw material of an insulating pipe through a screw extruder, by opening a valve provided on an outer wall of the heat delivery pipe, heat is delivered into a first heat storage pipe in the feeding cylinder, and through the formation of the delivery ports, the heat is delivered into the feeding cylinder to preheat, stir, and feed the raw material in the feeding cylinder.

[0018] 2. The through pipe provided in the present invention enables the delivered heat to be delivered from the first heat storage pipe to the second heat storage pipe, achieving an all-round effect of heat covering the inner wall of the feeding cylinder, and playing a role in improving the full heating and stirring of the raw material.

[0019] 3. The air supply cavity provided in the present invention, when the stirring rod is used to stir and load the insulating tube raw materials in the feeding cylinder, in order to improve the full heating effect of the raw materials in the cylinder, the gas is transported through the through holes opened on the outer wall of the annular tube through the air supply pipe and into the air supply cavity, and the gas is transported through the air supply holes opened on the outer wall of the stirring rod, which plays a role in improving the heating uniformity of the raw materials in the cylinder and improving the heating efficiency of the raw materials in the extruder.

[0020] 4. The heat supply nozzle provided in the present invention, when recycling the heat of the extruder, through the adjustment of the conversion cylinder, the recycled heat is blown to the cutting part of the insulating tube through the heat supply nozzle, reducing the situation of wrinkles caused by softening during the cutting of the insulating tube. Description of the Drawings

[0021] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the overall side view structural schematic diagram of the present invention; Figure 3 is the overall structural schematic diagram of the present invention in another direction; Figure 4 is the structural schematic diagram of the connection between the worm and the worm gear of the present invention; Figure 5 is the structural schematic diagram of the position distribution of the conversion cylinder of the present invention; Figure 6 is the sectional view structural schematic diagram of the feeding cylinder of the present invention; Figure 7 is the structural schematic diagram of the position distribution of the conveying port of the present invention; Figure 8 is the structural schematic diagram of the position distribution of the air supply holes of the present invention; Figure 9 is the structural schematic diagram of the position distribution of the air supply cavity of the present invention; Figure 10 is the structural schematic diagram of the position distribution of the through holes of the present invention; Figure 11 is the structural schematic diagram of the position distribution of the heat transfer cavity of the present invention; Figure 12 is the structural schematic diagram of the position distribution of the heat supply nozzle of the present invention; Figure 13 is the structural schematic diagram of the position distribution of the cutting tool body of the present invention.

[0022] The reference numerals in the drawings are: 1. Device main body; 2. Feeding cylinder; 3. Screw extruder; 4. Feeding port; 5. Extrusion die; 6. Traction frame; 7. Heat transfer pipe; 8. Adjusting cylinder; 9. Return pipe; 10. Connecting pipe; 11. First heat storage pipe; 12. Second heat storage pipe; 13. Through pipe; 14. Heat transfer cavity; 15. Delivery port; 16. Filter screen; 17. Connecting frame; 18. Stirring motor; 19. Connecting column; 20. Fixed rod; 21. Air supply cavity; 22. Stirring rod; 23. Air supply hole; 24. Annular pipe; 25. Air supply pipe; 26. Through hole; 27. Heat supply nozzle; 28. Connecting box; 29. Servo motor; 30. Worm; 31. Worm gear; 32. Conversion cylinder; 33. Electric push rod; 34. Lifting rod; 35. Cutting tool body; 36. Insulating pipe body. Detailed implementation manner

[0023] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in conjunction with the accompanying drawings and preferred embodiments, describe in detail the specific implementation manner, structure, features and effects of the present invention as follows.

[0024] Embodiment 1: Please refer to Figures 1 to 13 , this embodiment provides an automated production line for high-flame-retardant PET insulating sleeves, including a device main body 1. The device main body 1 includes a feeding cylinder 2 and a screw extruder 3. The screw extruder 3 is arranged on the feeding path of the feeding cylinder 2. A preheating assembly is arranged inside the feeding cylinder 2. An adjusting cylinder 8 is arranged on one side of the screw extruder 3. A delivery port 15 is opened on the inner wall of the feeding cylinder 2. The adjusting cylinder 8 conveys the recovered heat to the delivery port 15 through the preheating assembly; An air supply assembly is arranged inside the feeding cylinder 2. A fixed rod 20 is arranged on the inner wall of the feeding cylinder 2. A stirring rod 22 is fixedly connected to the outer wall of the fixed rod 20. Air supply holes 23 are opened on the surface of the stirring rod 22. The feeding cylinder 2 conveys gas to the air supply holes 23 through the air supply assembly.

[0025] As Figure 7 shown, a feeding port 4 located below the feeding cylinder 2 is opened at the top of the screw extruder 3. An extrusion die 5 is arranged on the outer wall of the device main body 1 at one end of the screw extruder 3. A traction frame 6 is arranged on the outer wall of the device main body 1 on one side of the extrusion die 5. A heat transfer pipe 7 fixedly connected to the outer wall of the adjusting cylinder 8 is fixedly connected to the outer wall of the screw extruder 3. A return pipe 9 fixedly connected to the outer wall of the feeding cylinder 2 is fixedly connected to the outer wall of the adjusting cylinder 8, which plays a role in conveniently converting the heat transfer path recovered by the extruder.

[0026] As Figure 6As shown in the figure, the preheating component includes a first heat storage pipe 11, a second heat storage pipe 12, a through pipe 13 and a heat transfer cavity 14. One end of the return pipe 9 is fixedly connected to the first heat storage pipe 11 arranged inside the feeding cylinder 2. The outer wall of the first heat storage pipe 11 is fixedly connected to the through pipe 13, and the outer wall of the through pipe 13 is fixedly connected to the second heat storage pipe 12. A filter screen 16 is arranged on the inner wall of the delivery port 15, which is beneficial to preheat and feed the raw materials in the feeding cylinder 2 through the first heat storage pipe 11 and the second heat storage pipe 12.

[0027] As Figure 6 shown in the figure, both the first heat storage pipe 11 and the second heat storage pipe 12 are arranged in a ring shape in the feeding cylinder 2, and a connection cavity is formed at the connection part between the inner wall of the feeding cylinder 2 and the first heat storage pipe 11. The first heat storage pipe 11 and the second heat storage pipe 12 are connected to each other through the through pipe 13, which is beneficial to the all-round preheating of the feeding cylinder 2 by the mutual connection of the first heat storage pipe 11 and the second heat storage pipe 12 through the through pipe 13.

[0028] As Figure 7 shown in the figure, the air supply component includes an annular pipe 24 and an air supply pipe 25. The top of the feeding cylinder 2 is fixedly connected with a grid-shaped connection frame 17. The top of the connection frame 17 is fixedly connected with a stirring motor 18. The output end of the stirring motor 18 is fixedly connected with a connection column 19 fixedly connected to the outer wall of the fixed rod 20. An air supply cavity 21 communicating with the air supply hole 23 is formed in the inner wall of the fixed rod 20. The annular pipe 24 is embedded in the inner side wall of the connection column 19. The outer wall of the annular pipe 24 is fixedly connected with an air supply pipe 25 connected to an external air supply device through a booster pump, which is beneficial to the convenient air outlet of the raw materials in the feeding cylinder 2 and improves the uniformity of heat absorption of the raw materials in the feeding cylinder 2 through the annular pipe 24 and the air supply pipe 25.

[0029] As Figures 8 - 9 shown in the figure, the connection column 19 and the annular pipe 24 are rotatably connected. A through hole 26 is formed at the bottom of the annular pipe 24 above the air supply cavity 21, which is beneficial to ensure the use stability of the annular pipe 24 through the rotatable connection between the connection column 19 and the annular pipe 24.

[0030] As Figure 8As shown in the figure, a connection box 28 is fixedly connected to the outer wall of the adjusting cylinder 8. A servo motor 29 is fixedly connected to the outer wall of the connection box 28. The output end of the servo motor 29 is fixedly connected to a worm 30 that is rotatably connected to the inner wall of the connection box 28. A worm gear 31 is meshed with the outer wall of the worm 30. The rotation center of the worm gear 31 is fixedly connected to a conversion cylinder 32 that is rotatably connected to the inner wall of the adjusting cylinder 8 through a rotating shaft. A connection pipe 10 is fixedly connected to the outer wall of the adjusting cylinder 8. One end of the connection pipe 10 is fixedly connected to a heat supply spray pipe 27. When it is necessary to convert the heat transfer path for use, the servo motor 29 is turned on. Through the rotation of the worm 30, the worm gear 31 is driven to perform a rotational motion. The rotation of the worm gear 31 drives the conversion cylinder 32 to rotate along the inner wall of the adjusting cylinder 8, playing a role in conveniently switching the heat transfer path for use.

[0031] As Figure 9 shown in the figure, a connection hole with a T-shaped cross-section is opened on the outer wall of the conversion cylinder 32, and the connection holes opened on the surface of the conversion cylinder 32 correspond to the return pipe 9, the connection pipe 10, and the heat transfer pipe 7 respectively. It is beneficial to open a connection hole with a T-shaped cross-section on the outer wall of the conversion cylinder 32 to play a role in multi-path conveying of the recovered heat for use.

[0032] As Figure 10 shown in the figure, an electric push rod 33 is fixedly connected to the outer wall of the device main body 1. One end of the electric push rod 33 is fixedly connected to a lifting rod 34 that is slidably connected to the outer wall of the device main body 1. A cutting tool body 35 is rotatably connected to the outer wall of the lifting rod 34 through a control motor. An insulating pipe body 36 penetrates through the outer wall of the extrusion die 5. It is beneficial to set the cutting tool body 35 to play a role in automatically cutting the formed insulating sleeve.

[0033] As Figure 9 shown in the figure, the heat supply spray pipe 27 is arranged on the movement track of the cutting tool body 35, and the heat supply spray pipe 27 is arranged in an inclined shape. It is beneficial to set the heat supply spray pipe 27 on the movement track of the cutting tool body 35 for the sleeve, reducing the situation of wrinkles caused by softening during the cutting of the insulating pipe.

[0034] Working principle: As Figures 1 - 13 shown in the figure, when the PET insulating sleeve automatic production equipment is in use, first, when the insulating pipe production raw materials are heated and extruded into shape by the screw extruder 3, the valve arranged on the outer wall of the heat transfer pipe 7 is opened, and the heat is transported into the first heat storage pipe 11 in the feeding cylinder 2. Through the opening of the conveying port 15, the heat is transported into the feeding cylinder 2 to preheat, stir, and feed the raw materials in the feeding cylinder 2. Next, when stirring and feeding the insulating tube raw materials in the feeding cylinder 2 through the stirring rod 22, in order to improve the sufficient heating effect of the raw materials in the cylinder, the gas is transported through the through holes 26 formed in the outer wall of the annular tube 24 through the air supply pipe 25 and into the air supply cavity 21, and the gas is transported through the air supply holes 23 formed in the outer upper wall of the stirring rod 22, which plays a role in improving the uniformity of the raw materials heated in the cylinder and improving the heating efficiency of the raw materials in the extruder; Finally, when recycling the heat of the extruder, through the adjustment of the conversion cylinder 32, the recycled heat is blown to the cutting part of the insulating tube through the heat supply nozzle 27, reducing the wrinkles caused by softening during the cutting of the insulating tube.

[0035] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the above-disclosed technical content without departing from the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An automated production line for high flame-retardant PET insulating sleeves, comprising a device main body (1), characterized in that: The device main body (1) includes a feeding cylinder (2) and a screw extruder (3). The screw extruder (3) is arranged on the feeding path of the feeding cylinder (2). A preheating assembly is arranged inside the feeding cylinder (2). One side of the screw extruder (3) is provided with an adjusting cylinder (8). A conveying port (15) is formed in the inner wall of the feeding cylinder (2). The adjusting cylinder (8) conveys the recovered heat to the conveying port (15) through the preheating assembly. A gas supply assembly is arranged inside the feeding cylinder (2). A fixing rod (20) is arranged on the inner wall of the feeding cylinder (2). A stirring rod (22) is fixedly connected to the outer wall of the fixing rod (20). Air supply holes (23) are formed on the surface of the stirring rod (22). The feeding cylinder (2) conveys gas to the air supply holes (23) through the gas supply assembly.

2. The automated production line of a highly flame-retardant PET insulating sleeve according to claim 1, characterized in that: A feeding port (4) located below the feeding cylinder (2) is formed at the top of the screw extruder (3). An extrusion die (5) located at one end of the screw extruder (3) is arranged on the outer wall of the device main body (1). A traction frame (6) located on one side of the extrusion die (5) is arranged on the outer wall of the device main body (1). A heat transfer pipe (7) fixedly connected to the outer wall of the adjusting cylinder (8) is fixedly connected to the outer wall of the screw extruder (3). A return pipe (9) fixedly connected to the outer wall of the feeding cylinder (2) is fixedly connected to the outer wall of the adjusting cylinder (8).

3. An automated production line for a highly flame-retardant PET insulating sleeve according to claim 1, characterized in that: The preheating assembly includes a first heat storage pipe (11), a second heat storage pipe (12), a through pipe (13), and a heat transfer cavity (14). One end of the return pipe (9) is fixedly connected to the first heat storage pipe (11) arranged inside the feeding cylinder (2). A through pipe (13) is fixedly connected to the outer wall of the first heat storage pipe (11). A second heat storage pipe (12) is fixedly connected to the outer wall of the through pipe (13). A filter screen (16) is arranged on the inner wall of the conveying port (15).

4. An automated production line for a highly flame-retardant PET insulating sleeve according to claim 3, characterized in that: Both the first heat storage pipe (11) and the second heat storage pipe (12) are arranged in a ring shape in the feeding cylinder (2). A connection cavity is formed at the connection part between the inner wall of the feeding cylinder (2) and the first heat storage pipe (11). The first heat storage pipe (11) and the second heat storage pipe (12) are connected to each other through the through pipe (13).

5. An automated production line for a highly flame-retardant PET insulating sleeve according to claim 1, characterized in that: The gas supply assembly includes an annular pipe (24) and a gas supply pipe (25). A grid-shaped connection frame (17) is fixedly connected to the top of the feeding cylinder (2). A stirring motor (18) is fixedly connected to the top of the connection frame (17). An output end of the stirring motor (18) is fixedly connected to a connection column (19) fixedly connected to the outer wall of the fixing rod (20). An air supply cavity (21) communicating with the air supply holes (23) is formed in the inner wall of the fixing rod (20). The annular pipe (24) is embedded in the inner side wall of the connection column (19). The gas supply pipe (25) fixedly connected to the outer wall of the annular pipe (24) through a booster pump is connected to an external gas supply device.

6. The automated production line for a highly flame-retardant PET insulating sleeve according to claim 1, characterized in that: The connection column (19) and the annular pipe (24) are rotatably connected. A through hole (26) located above the air supply cavity (21) is formed at the bottom of the annular pipe (24).

7. An automated production line for a highly flame-retardant PET insulating sleeve according to claim 1, characterized in that: The outer wall of the adjusting cylinder (8) is fixedly connected with a connection box (28). The outer wall of the connection box (28) is fixedly connected with a servo motor (29). The output end of the servo motor (29) is fixedly connected with a worm (30) rotatably connected to the inner wall of the connection box (28). The outer wall of the worm (30) is engaged with a worm gear (31). The rotation center of the worm gear (31) is fixedly connected with a conversion cylinder (32) rotatably connected to the inner wall of the adjusting cylinder (8) through a rotating shaft. The outer wall of the adjusting cylinder (8) is fixedly connected with a connecting pipe (10). One end of the connecting pipe (10) is fixedly connected with a heat supply spray pipe (27).

8. An automated production line for a highly flame-retardant PET insulating sleeve according to claim 7, characterized in that: The outer wall of the conversion cylinder (32) is provided with a connection hole having a T-shaped cross-section, and the connection holes formed on the surface of the conversion cylinder (32) are respectively arranged corresponding to the reflux pipe (9), the connecting pipe (10), and the heat transfer pipe (7).

9. An automated production line for a highly flame-retardant PET insulating sleeve according to claim 1, characterized in that: The outer wall of the device main body (1) is fixedly connected with an electric push rod (33). One end of the electric push rod (33) is fixedly connected with a lifting rod (34) slidably connected to the outer wall of the device main body (1). The outer wall of the lifting rod (34) is rotatably connected with a cutting tool body (35) through a control motor. An insulating pipe body (36) penetrates through the outer wall of the extrusion die (5).

10. An automated production line for a highly flame-retardant PET insulating sleeve according to claim 9, characterized in that: The heat supply spray pipe (27) is arranged on the movement track of the cutting tool body (35), and the heat supply spray pipe (27) is arranged in an inclined shape.

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