Double-layer pipe forming extruder

Abstract

The utility model relates to the technical field of extruders, in particular to a double-layer pipe forming extruder which comprises a first extrusion die, a second extrusion die is arranged in the first extrusion die, one end of the outer wall of the second extrusion die is fixed to the inner wall of the first extrusion die through a support, and a center rod is arranged in the second extrusion die. One end of the center rod is fixed to the inner wall of the second extrusion die through a support, and a first extrusion inner cavity is formed between the first extrusion die and the second extrusion die. When synchronous extrusion processing of the double-layer pipe needs to be carried out, a power supply of the first electric heating pipe is switched on in advance so that the first electric heating pipe can be heated, a first extrusion channel can be heated through the heat conduction effect of the first heating sleeve, a second electric heating pipe can be heated through switching on a power supply of the second electric heating pipe, and a second extrusion channel can be heated through the heat conduction effect of the second heating sleeve. The second extrusion channel can be heated, and then different materials are fed into the first extrusion channel and the second extrusion channel through the first hopper and the second hopper respectively.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, and in particular to a double-layer tube forming extruder. Background Technology

[0002] Double-walled pipe is a type of pipe with an inner and outer layer structure. Its design purpose is to combine the advantages of different materials to improve the performance and application range of the pipe.

[0003] An extruder is a mechanical device used to heat and plasticize thermoplastic or thermosetting materials and extrude them through a die. Extruders are widely used in the plastics, rubber, food, and pharmaceutical industries to produce various pipes, sheets, films, cables, profiles, and other products. For example, Chinese Patent Publication No. CN216885110U provides a double-layer plastic pipe extrusion molding production line, characterized by: an extruder and a vacuum shaping and cooling mechanism arranged sequentially; a double-layer extrusion molding die fixedly installed at the extrusion end of the extruder; the double-layer extrusion molding die for forming a double-layer plastic pipe with an outer tube, an inner tube, and multiple reinforcing ribs; a cavity formed between the outer tube, the inner tube, and two adjacent reinforcing ribs; an air blowing mechanism connected to the double-layer extrusion molding die for blowing air into the cavity to prevent the inner wall of the outer tube from sticking to the outer wall of the inner tube; and the vacuum shaping and cooling mechanism for simultaneously vacuum shaping and cooling the formed outer and inner tubes. This utility model has a novel overall structure, making production more flexible and convenient. It also adopts a new process, which effectively ensures the overall lightweighting of the double-layer plastic tube, while effectively saving overall production and material costs.

[0004] Currently, when producing double-layer pipes, most manufacturers produce one layer first and then process the other side. However, this method affects the fit of the double-layer pipes. In addition, producing the inner and outer layers separately also affects work efficiency. Therefore, it is necessary to design a device that can produce both layers simultaneously to meet the processing needs of double-layer pipes. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a double-layer tube forming extruder.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a double-layer tube forming extruder, including an extrusion die one, an extrusion die two is provided inside the extrusion die one, one end of the outer wall of the extrusion die two is fixed to the inner wall of the extrusion die one by a bracket, a center rod is provided inside the extrusion die two, one end of the center rod is fixed to the inner wall of the extrusion die two by a bracket, an extrusion cavity one is provided between the extrusion die one and the extrusion die two, and an extrusion cavity two is provided between the extrusion die two and the center rod;

[0008] One end of the extrusion die is provided with an extrusion channel, and the connection between the extrusion channel and the extrusion die is fixed by screws. Below the extrusion channel is an extrusion channel, and one end of the extrusion channel is provided through the extrusion die and the extrusion die in sequence. The connection between the extrusion channel and the extrusion die is fixed by screws.

[0009] The surface of the extrusion channel is covered with a heating sleeve, and the connection between the heating sleeve and the extrusion channel is fixed by screws. Several electric heating tubes are fixedly embedded inside the heating sleeve.

[0010] The surface of the second extrusion channel is covered with a second heating sleeve. The connection between the second heating sleeve and the second extrusion channel is fixed by screws. Several heating tubes are fixedly embedded inside the second heating sleeve.

[0011] In detail, a hopper is provided through one side of the upper end of the extrusion channel one, and the connection between the hopper one and the extrusion channel one is fixed by welding. A sealing plate is fixed at the end of the extrusion channel one away from the extrusion mold one.

[0012] In detail, a bearing is provided through the center of the sealing plate, and the connection between the bearing and the sealing plate is fixed by welding. An extrusion rod is provided through the inside of the bearing, and the extrusion rod is interference-fitted with the inner ring wall of the bearing.

[0013] In detail, the extrusion rod is provided with a spiral blade at one end inside the extrusion channel. The inner spiral position of the spiral blade is welded and fixed to the surface of the extrusion rod, and the outer spiral position of the spiral blade is in close contact with the inner wall of the extrusion channel. The outer end of the extrusion rod is provided with a motor. The outer wall of the motor is fixedly assembled with the sealing plate through a bracket. The motor is provided with a drive shaft. The end of the drive shaft is fixedly connected to the end of the extrusion rod through a coupling.

[0014] In detail, a hopper is provided through the upper two sides of the extrusion channel two, and the connection between the hopper two and the extrusion channel two is fixed by welding. A sealing plate is fixed at the two ends of the extrusion channel two away from the extrusion mold one.

[0015] In detail, a bearing is provided through the center of the sealing plate 2, and the connection between the bearing 2 and the sealing plate 2 is fixed by welding. An extrusion rod 2 is provided through the inside of the bearing 2, and the extrusion rod 2 is interference-fitted with the inner ring wall of the bearing 2.

[0016] In detail, the extrusion rod 2 is located inside the extrusion channel 2 and has spiral blades 2 at both ends. The inner spiral position of the spiral blades 2 is welded and fixed to the surface of the extrusion rod 2, and the outer spiral position of the spiral blades 2 is in close contact with the inner wall of the extrusion channel 2. The outer end of the extrusion rod 2 is equipped with a motor 2. The outer wall of the motor 2 is fixedly assembled with the sealing plate 2 through a bracket. The motor 2 has a rotating shaft 2 for driving inside. The end of the rotating shaft 2 is fixedly connected to the end of the extrusion rod 2 through a coupling.

[0017] The design scheme proposed in this utility model has the following beneficial effects in application:

[0018] 1. When synchronous extrusion processing of double-layer tubes is required, first turn on the power supply of heating tube one so that heating tube one can be heated. Through the heat conduction effect of heating sleeve one, extrusion channel one can be heated. Turn on the power supply of heating tube two so that heating tube two can be heated. Through the heat conduction effect of heating sleeve two, extrusion channel two can be heated. Then, feed different materials into extrusion channel one and extrusion channel two through hopper one and hopper two respectively. Turn on the power supply of motor one and motor two respectively. Motor one can drive extrusion rod one to rotate through shaft one so that spiral blade one can perform spiral feeding. Motor two can drive extrusion rod two to rotate through shaft two so that spiral blade two can perform spiral feeding.

[0019] 2. The material pushed out by the first extrusion channel will enter the first extrusion cavity formed between the first extrusion die and the second extrusion die. The material pushed out by the second extrusion channel will enter the second extrusion cavity formed by the second extrusion die and the center rod. As the material is continuously fed outward, a double-layer pipe-within-a-pipe structure can be formed, thereby realizing the processing of double-layer pipes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the central rod and extrusion die structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the overall internal structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the front shape of the center rod and the extrusion die of this utility model.

[0024] In the diagram: 1. Extrusion die one; 11. Extrusion die two; 12. Center rod; 13. Extrusion channel one; 14. Extrusion channel two; 15. Heating jacket one; 16. Heating tube one; 17. Heating jacket two; 18. Heating tube two; 2. Hopper one; 21. Sealing plate one; 22. Bearing one; 23. Extrusion rod one; 24. Spiral blade one; 25. Motor one; 3. Hopper two; 31. Sealing plate two; 32. Bearing two; 33. Extrusion rod two; 34. Spiral blade two; 35. Motor two. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figures 1-4 A double-layer tube forming extruder includes an extrusion die 1, an extrusion die 2 11 inside the extrusion die 1, one end of the outer wall of the extrusion die 2 11 being fixed to the inner wall of the extrusion die 1 1 by a bracket, a center rod 12 inside the extrusion die 2 11, one end of the center rod 12 being fixed to the inner wall of the extrusion die 2 11 by a bracket, an extrusion cavity 1 between the extrusion die 1 1 and the extrusion die 2 11, and an extrusion cavity 2 between the extrusion die 2 11 and the center rod 12.

[0027] One end of the extrusion die 1 is provided with an extrusion channel 13. The connection between the extrusion channel 13 and the extrusion die 1 is fixed by screws. Below the extrusion channel 13, there is an extrusion channel 2 14. One end of the extrusion channel 2 14 is provided through the extrusion die 1 and the extrusion die 2 11 in sequence, and the connection between the extrusion channel 2 14 and the extrusion die 1 is fixed by screws.

[0028] The surface of the extrusion channel 13 is covered with a heating sleeve 15. The connection between the heating sleeve 15 and the extrusion channel 13 is fixed by screws. Several electric heating tubes 16 are fixedly embedded inside the heating sleeve 15.

[0029] The surface of the extrusion channel 2 14 is covered with a heating sleeve 2 17. The connection between the heating sleeve 2 17 and the extrusion channel 2 14 is fixed by screws. Several electric heating tubes 2 18 are fixedly embedded inside the heating sleeve 2 17.

[0030] It should be further explained that a hopper 2 is installed through one side of the upper end of the extrusion channel 13. The connection between the hopper 2 and the extrusion channel 13 is fixed by welding. A sealing plate 21 is fixed at the end of the extrusion channel 13 away from the extrusion die 1. The extrusion channel 13 can be used as a material attack for the outer tube.

[0031] It should be further explained that a bearing 22 is installed through the center of the sealing plate 21. The connection between the bearing 22 and the sealing plate 21 is fixed by welding. An extrusion rod 23 is installed through the inside of the bearing 22. The extrusion rod 23 is interference-fitted with the inner ring wall of the bearing 22. The bearing 22 is a sealed bearing, which can ensure the stable driving of the extrusion rod 23.

[0032] It should be further explained that a spiral blade 24 is provided at one end of the extrusion rod 23 inside the extrusion channel 13. The inner spiral position of the spiral blade 24 is welded and fixed to the surface of the extrusion rod 23, and the outer spiral position of the spiral blade 24 is in close contact with the inner wall of the extrusion channel 13. A motor 25 is provided at the outer end of the extrusion rod 23. The outer wall of the motor 25 is fixedly assembled with the sealing plate 21 through a bracket. A drive shaft is provided inside the motor 25. The end of the drive shaft is fixedly connected to the end of the extrusion rod 23 through a coupling. The spiral blade 24 can be used for spiral feeding in the extrusion channel 13.

[0033] It should be further explained that hoppers 2 and 3 are installed through the upper two sides of the extrusion channel 2 14. The connection between hoppers 2 and 3 and the extrusion channel 2 14 is fixed by welding. Sealing plates 2 and 31 are fixed at the two ends of the extrusion channel 2 14 away from the extrusion die 1. The extrusion channel 2 14 can transport materials to the inner tube.

[0034] It should be further explained that a bearing 32 is installed through the center of the sealing plate 31. The connection between the bearing 32 and the sealing plate 31 is fixed by welding. An extrusion rod 33 is installed through the inside of the bearing 32. The extrusion rod 33 is interference-fitted with the inner ring wall of the bearing 32. The bearing 32 is a sealed bearing, which can ensure the stable rotation of the extrusion rod 33.

[0035] It should be further explained that the extrusion rod 2 33 is located inside the extrusion channel 2 14 and has spiral blades 2 34 at both ends. The inner spiral position of the spiral blades 2 34 is welded and fixed to the surface of the extrusion rod 2 33, and the outer spiral position of the spiral blades 2 34 is in close contact with the inner wall of the extrusion channel 2 14. The outer end of the extrusion rod 2 33 is equipped with a motor 2 35. The outer wall of the motor 2 35 is fixedly assembled with the sealing plate 2 31 through a bracket. The motor 2 35 has a rotating shaft 2 for driving inside. The end of the rotating shaft 2 is fixedly connected to the end of the extrusion rod 2 33 through a coupling. The spiral blades 2 34 can ensure the stable material conveying in the extrusion channel 2 14.

[0036] Working method: When synchronous extrusion processing of double-layer tubes is required, first turn on the power supply of heating tube 16 to heat it. Through the heat conduction effect of heating sleeve 15, extrusion channel 13 can be heated. Turn on the power supply of heating tube 2 to heat it. Through the heat conduction effect of heating sleeve 2 17, extrusion channel 2 14 can be heated. Then, different materials are fed into extrusion channel 13 and extrusion channel 2 14 through hopper 1 2 and hopper 2 3 respectively. Turn on the power supply of motor 1 25 and motor 2 35 respectively. Motor 1 25 can drive extrusion rod 23 to rotate through shaft 1, so that spiral blade 24 can perform spiral feeding. Motor 2 35 can drive extrusion rod 2 33 to rotate through shaft 2, so that spiral blade 2 34 can perform spiral feeding.

[0037] The material pushed out by the extrusion channel 13 will enter the extrusion cavity 1 formed between the extrusion die 1 and the extrusion die 2 11. The material pushed out by the extrusion channel 2 14 will enter the extrusion cavity 2 formed by the extrusion die 2 11 and the center rod 12. When the material is continuously fed outward, a double-layer pipe-within-a-pipe structure can be formed, thereby realizing the processing of double-layer pipe.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A double-layer tube forming extruder, comprising an extrusion die (1), characterized in that: The extrusion die one (1) is provided with an extrusion die two (11) inside. One end of the outer wall of the extrusion die two (11) is fixed to the inner wall of the extrusion die one (1) by a bracket. The extrusion die two (11) is provided with a central rod (12) inside. One end of the central rod (12) is fixed to the inner wall of the extrusion die two (11) by a bracket. An extrusion cavity one is provided between the extrusion die one (1) and the extrusion die two (11). An extrusion cavity two is provided between the extrusion die two (11) and the central rod (12). One end of the extrusion die (1) is provided with an extrusion channel (13), and the connection between the extrusion channel (13) and the extrusion die (1) is fixed by screws. Below the extrusion channel (13) is an extrusion channel (14), and one end of the extrusion channel (14) is provided through the extrusion die (1) and the extrusion die (11) in sequence. The connection between the extrusion channel (14) and the extrusion die (1) is fixed by screws. The surface of the extrusion channel 1 (13) is covered with a heating sleeve 1 (15). The connection between the heating sleeve 1 (15) and the extrusion channel 1 (13) is fixed by screws. Several electric heating tubes 1 (16) are fixedly embedded inside the heating sleeve 1 (15). The surface of the second extrusion channel (14) is covered with a second heating sleeve (17). The connection between the second heating sleeve (17) and the second extrusion channel (14) is fixed by screws. Several heating tubes (18) are fixedly embedded inside the second heating sleeve (17).

2. The double-layer tube forming extruder according to claim 1, characterized in that: A hopper (2) is provided through one side of the upper end of the extrusion channel (13). The connection between the hopper (2) and the extrusion channel (13) is fixed by welding. A sealing plate (21) is fixed at the end of the extrusion channel (13) away from the extrusion mold (1).

3. The double-layer tube forming extruder according to claim 2, characterized in that: A bearing (22) is provided through the center of the sealing plate (21). The bearing (22) and the sealing plate (21) are fixed by welding. An extrusion rod (23) is provided through the inside of the bearing (22). The extrusion rod (23) and the inner ring wall of the bearing (22) are interference fit.

4. The double-layer tube forming extruder according to claim 3, characterized in that: The extrusion rod (23) is located inside the extrusion channel (13) and has a spiral blade (24) at one end. The inner spiral position of the spiral blade (24) is welded and fixed to the surface of the extrusion rod (23). The outer spiral position of the spiral blade (24) is in close contact with the inner wall of the extrusion channel (13). The outer end of the extrusion rod (23) is equipped with a motor (25). The outer wall of the motor (25) is fixedly assembled with the sealing plate (21) through a bracket. The motor (25) is equipped with a drive shaft. The end of the drive shaft is fixedly connected to the end of the extrusion rod (23) through a coupling.

5. The double-layer tube forming extruder according to claim 4, characterized in that: The upper two sides of the extrusion channel two (14) are provided with hopper two (3), and the connection position between hopper two (3) and extrusion channel two (14) is fixed by welding. The two ends of the extrusion channel two (14) away from the extrusion mold one (1) are fixed with sealing plate two (31).

6. The double-layer tube forming extruder according to claim 5, characterized in that: A bearing 2 (32) is provided through the center of the sealing plate 2 (31). The connection between the bearing 2 (32) and the sealing plate 2 (31) is fixed by welding. An extrusion rod 2 (33) is provided through the inside of the bearing 2 (32). The extrusion rod 2 (33) and the inner ring wall of the bearing 2 (32) are configured with interference fit.

7. The double-layer tube forming extruder according to claim 6, characterized in that: The extrusion rod 2 (33) is located inside the extrusion channel 2 (14) and has a spiral blade 2 (34) at both ends. The inner spiral position of the spiral blade 2 (34) is welded and fixed to the surface of the extrusion rod 2 (33). The outer spiral position of the spiral blade 2 (34) is in close contact with the inner wall of the extrusion channel 2 (14). The outer end of the extrusion rod 2 (33) is equipped with a motor 2 (35). The outer wall of the motor 2 (35) is fixedly assembled with the sealing plate 2 (31) through a bracket. The motor 2 (35) is equipped with a rotating shaft 2 for driving inside. The end of the rotating shaft 2 is fixedly connected to the end of the extrusion rod 2 (33) through a coupling.

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