Twin-screw extruder for producing cable sheath material

Abstract

The utility model provides a double-screw extruder for producing a cable sheath material, and belongs to the technical field of double-screw extruders. Comprising a bottom plate and a double-screw extruder body, and a conveying part is arranged on the double-screw extruder body. Through the design of different spiral angles of the first conveying sheet and the second conveying sheet, proper thrust can be provided according to material states at different positions, materials are slowly introduced at a material inlet at a smaller spiral angle, and accumulation is prevented; the large spiral angle provides enough thrust before materials enter the extruder, it is ensured that the materials are stably conveyed, the risks of adhesion and blockage are reduced, meanwhile, the friction force between the materials and the conveying pieces can be increased by arranging the protruding blocks, material balls can be scattered easily, and adhesion of the materials in the conveying process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of twin-screw extruders, and particularly relates to a twin-screw extruder for producing cable sheath materials. Background Art

[0002] A twin-screw extruder is a high-precision polymer processing device, mainly used for material mixing, co-mixing and granulation. This device plays an important role in the polymer industry and is widely used in the research and production of various materials. Cable sheath materials are usually composite materials composed of multiple components such as base resin, filler, plasticizer, stabilizer, antioxidant, etc. The twin-screw extruder can achieve efficient mixing and dispersion of materials in a short time through its unique meshing screw design, so it is used in the production of cable sheath materials.

[0003] At present, during the use of the existing twin-screw extruder, a conveying device is usually used to convey materials into the twin-screw extruder. However, when the existing conveying device conveys viscous materials, due to the strong intermolecular attraction, an adhesion layer is easily formed on the inner wall of the conveying device. This adhesion layer gradually thickens over time, resulting in a reduction in the effective cross-sectional area of the conveying channel, an increase in the material flow resistance, and thus a decrease in the conveying speed. In severe cases, the material may completely block the conveying channel. Therefore, this application provides a twin-screw extruder for producing cable sheath materials to meet the requirements. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a twin-screw extruder for producing cable sheath materials to solve the problem that when the existing twin-screw extruder is in use, a conveying device is usually used to convey materials into the twin-screw extruder, and the materials are easily adhered to the inside of the conveying device, causing the conveying channel to be blocked.

[0005] To solve the above technical problem, the utility model provides the following technical solutions:

[0006] A twin-screw extruder for producing cable sheathing material, comprising a bottom plate and a twin-screw extruder body. A conveying part is arranged on the twin-screw extruder body. The conveying part includes: a conveying cylinder arranged on the twin-screw extruder body, and the conveying cylinder is communicated with the twin-screw extruder body through a conveying pipe; a driving motor arranged on one side of the conveying cylinder; a conveying rod, one end of which is arranged in the conveying cylinder and the other end is connected to the output end of the driving motor; a first conveying piece arranged on the conveying rod; a second conveying piece, one end of which is arranged on the conveying rod and the other end is connected to the first conveying piece; and the spiral angle of the first conveying piece is smaller than that of the second conveying piece; a plurality of bumps are respectively arranged on the first conveying piece and the second conveying piece; the bumps are made of wear-resistant materials, possibly hardened steel, to ensure durability during material conveying.

[0007] It further includes: a pretreatment part arranged above the conveying part. The pretreatment part includes: a treatment tank arranged on the twin-screw extruder body through a support column, and the bottom of the treatment tank is communicated with the conveying cylinder through a connecting pipe; a stepping motor arranged on the top of the treatment tank.

[0008] It further includes: a rotating rod, one end of which is arranged in the treatment tank and the other end penetrates through the treatment tank and is connected to the output end of the stepping motor; two first stirring rods arranged on the rotating rod, and the first stirring rods are in an L shape.

[0009] It further includes: a plurality of second stirring rods arranged on the rotating rod, and the plurality of second stirring rods are distributed alternately.

[0010] The second stirring rod includes: an outer layer; an inner layer arranged inside the outer layer; a heating layer arranged between the outer layer and the inner layer; the heating layer is made of a material with good thermal conductivity, such as copper or aluminum, combined with resistance wires or electric heating elements to ensure uniform heat transfer to the material; the outer layer is made of a heat-conducting material and the inner layer is made of a heat-insulating material.

[0011] It further includes: a plurality of exhaust ports arranged on the twin-screw extruder body; an exhaust part arranged on the bottom plate. The exhaust part includes: a U-shaped pipe detachably arranged on the exhaust port; an exhaust pipe communicated with the bottom of the U-shaped pipe.

[0012] It further includes: a protection frame arranged on the bottom plate; an exhaust fan arranged inside the protection frame; a purification box arranged inside the protection frame, and the suction end of the exhaust fan is communicated with the purification box; a channel pipe, one end of which is communicated with the purification box and the other end is communicated with the exhaust pipe.

[0013] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0014] In the above solution, by setting different spiral angles for the first conveying sheet and the second conveying sheet, it is possible to provide appropriate thrust according to the material state at different positions. A smaller spiral angle slowly introduces the material at the material inlet to prevent accumulation; a larger spiral angle provides sufficient thrust before the material enters the extruder to ensure smooth conveying of the material, reduce the risk of adhesion and blockage. At the same time, by setting the bumps, the friction between the material and the conveying sheet can be increased, which helps to break up the material mass and reduce the adhesion of the material during conveying.

[0015] By setting up a pretreatment section, the material can be pre-mixed and heated in advance to improve the fluidity of the material, reduce the viscosity, thereby reducing the adhesion tendency of the material during subsequent conveying, and improving the extrusion efficiency and product quality of the twin-screw extruder. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of a twin-screw extruder for producing cable sheathing material.

[0017] Figure 2 It is a schematic diagram of the exhaust pipe structure.

[0018] Figure 3 It is a schematic diagram of the structure of the exhaust fan.

[0019] Figure 4 It is a schematic diagram of the structure of the conveying section.

[0020] Figure 5 It is a sectional view of the structure of the treatment tank.

[0021] Figure 6 It is a schematic diagram of the structure of the heating layer.

[0022] [Reference Signs]

[0023] 1, bottom plate; 2, twin-screw extruder body; 3, exhaust port; 4, exhaust section; 5, conveying section; 6, pretreatment section; 41, U-shaped pipe; 42, exhaust pipe; 43, protection frame; 44, channel pipe; 45, purification box; 46, exhaust fan; 51, drive motor; 52, conveying cylinder; 53, bump; 54, second conveying sheet; 55, first conveying sheet; 56, conveying rod; 61, stepping motor; 62, treatment tank; 63, first stirring rod; 64, second stirring rod; 65, rotating rod; 641, inner layer; 642, heating layer; 643, outer layer.

[0024] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure. However, this is only for schematic purposes and is not intended to limit the present invention to this specific structure, device, and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and the adjustments or modifications still fall within the scope of the appended claims. Detailed implementation manners

[0025] The following describes in detail a polymer material injection molding device provided by the present invention with reference to the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; and the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0026] As Figure 1 - Figure 6 shown, an embodiment of the present invention provides a twin-screw extruder for producing cable sheath materials, including a bottom plate 1 and a twin-screw extruder body 2. A conveying part 5 is arranged on the twin-screw extruder body 2. The conveying part 5 includes: a conveying cylinder 52 arranged on the twin-screw extruder body 2, and the conveying cylinder 52 is communicated with the twin-screw extruder body 2 through a conveying pipe; a driving motor 51 arranged on one side of the conveying cylinder 52; a conveying rod 56, one end of which is arranged in the conveying cylinder 52 and the other end of which is connected to the output end of the driving motor 51; a first conveying piece 55 arranged on the conveying rod 56; a second conveying piece 54, one end of which is arranged on the conveying rod 56 and the other end of which is connected to the first conveying piece 55; and the spiral angle of the first conveying piece 55 is smaller than that of the second conveying piece 54; a plurality of bumps 53 are respectively arranged on the first conveying piece 55 and the second conveying piece 54.

[0027] By setting the spiral angle of the first conveying piece 55 to be smaller than that of the second conveying piece 54, the smaller spiral angle provides a gentle pushing force at the material inlet, which helps the material to smoothly enter the conveying system and avoid accumulation and blockage. And the larger spiral angle provides a stronger pushing force when the material approaches the extruder inlet, ensuring that the material can smoothly enter the extruder and at the same time perform deeper mixing and plasticization; by setting a plurality of bumps 53, at least two or more, the friction between the material and the conveying piece can be increased, which helps to break up the material mass and promote the dispersion and mixing of the material. Especially when dealing with viscous materials, the bumps 53 can break the adhesion between the materials and reduce the adhesion and agglomeration of the material during the conveying process.

[0028] It further includes: a pretreatment unit 6, arranged above the conveying unit 5. The pretreatment unit 6 includes: a processing tank 62, which is arranged on the twin-screw extruder body 2 through support columns, and the bottom of the processing tank 62 is communicated with the conveying cylinder 52 through a connecting pipe; a stepping motor 61, arranged on the top of the processing tank 62.

[0029] By setting the processing tank 62, its main function is to perform premixing and pretreatment on the material before it enters the twin-screw extruder body 2. By carrying out preliminary mixing and heating of the material inside the processing tank 62, the fluidity of the material can be improved, the adhesion tendency of the viscous material during subsequent conveying can be reduced, and at the same time, it is also helpful for the uniform plasticization of the material. Two feed valves are arranged on the top of the processing tank 62, and a control valve is arranged on the connecting pipe to control the opening or closing of the connecting pipe.

[0030] It further includes: a rotating rod 65, one end of which is arranged inside the processing tank 62, and the other end penetrates through the processing tank 62 and is connected to the output end of the stepping motor 61; two first stirring rods 63, arranged on the rotating rod 65, and the first stirring rods 63 are in an L shape.

[0031] By setting the first stirring rods 63 in an L shape, a local stirring and tumbling effect can be generated inside the processing tank 62, which is helpful for the uniform mixing of the material. The L-shaped design can reach the corner areas of the tank body, ensuring no dead corners and making the material mixing more thorough.

[0032] It further includes: a plurality of second stirring rods 64, arranged on the rotating rod 65, and the plurality of second stirring rods 64 are staggeredly distributed. By setting a plurality of second stirring rods 64, at least two or more, the staggered distribution design of the second stirring rods 64 can generate a more complex flow field, which is complementary to the L-shaped stirring mode of the first stirring rods 63, forming a multi-level material stirring and further improving the mixing efficiency.

[0033] The second stirring rod 64 includes: an outer layer 643; an inner layer 641, arranged inside the outer layer 643; a heating layer 642, arranged between the outer layer 643 and the inner layer 641. By setting the heating layer 642, its main function is to heat the material inside the processing tank 62. By heating, the viscosity of the material is reduced, the fluidity is improved, and at the same time, the plasticization and uniform mixing of the material are promoted, which is helpful for improving the processing performance of the material.

[0034] It further includes: a plurality of exhaust ports 3, arranged on the twin-screw extruder body 2; an exhaust unit 4, arranged on the bottom plate 1. The exhaust unit 4 includes: a U-shaped pipe 41, detachably arranged on the exhaust port 3; an exhaust pipe 42, communicatively arranged at the bottom of the U-shaped pipe 41.

[0035] By setting the exhaust port 3, its main function is to allow the gases or vapors generated within the twin-screw extruder body 2 to be discharged, avoiding pressure buildup and potential explosion risks, while removing volatile organic compounds or other harmful gases that the material may release during the heating and mixing processes; the U-shaped tube 41 can be connected by flange connection, snap connection, or quick connector connection.

[0036] It further includes: a protection frame 43, arranged on the bottom plate 1; an exhaust fan 46, arranged within the protection frame 43; a purification box 45, arranged within the protection frame 43, and the suction end of the exhaust fan 46 communicates with the purification box 45; a channel pipe 44, with one end communicatively arranged on the purification box 45 and the other end communicating with the exhaust pipe 42.

[0037] By setting the purification box 45, its function is to filter and purify the exhaust gas discharged from the twin-screw extruder body 2, removing harmful substances, dust, and volatile organic compounds therein to meet environmental protection standards, protecting the environment and the health of the staff. Meanwhile, the purification box 45 includes filters, activated carbon adsorption layers, chemical reactors, etc.

[0038] The technical solution provided by the present utility model imports the material into the treatment tank 62 through the feed valve, and it is conducive for the external controller to start the operation of the stepping motor 61 and the heating layer 642. The stepping motor 61 rotates, driving the rotating rod 65 to rotate, causing the first stirring rod 63 and the second stirring rod 64 to rotate, and then heating the material through the heating layer 642 to promote the premixing and preliminary plasticization of the material; the pretreated material flows into the conveying cylinder 52 through the connecting pipe. Meanwhile, it is conducive for the external controller to start the operation of the driving motor 51. The driving motor 51 drives the conveying rod 56 to rotate, causing the first conveying piece 55 and the second conveying piece 54 to rotate, pushing the material forward. Meanwhile, the convex block 53 increases the contact area between the material and the first conveying piece 55 and the second conveying piece 54, improving the mixing effect. The material that has been pretreated and preliminarily mixed enters the twin-screw extruder body 2 through the conveying pipe, and undergoes in-depth melting and mixing of the material. Meanwhile, the exhaust fan 46 is started to operate. The exhaust gas generated during the extrusion process enters the U-shaped tube 41 through the exhaust port 3, passes through the exhaust pipe 42 and the channel pipe 44 into the purification box 45, where the exhaust gas is purified, and the purified air is discharged through the exhaust end of the exhaust fan 46.

[0039] The present utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the essence and scope of the present utility model. To enable the public to have a thorough understanding of the present utility model, specific details have been described in detail in the above preferred embodiments of the present utility model. However, those skilled in the art can fully understand the present utility model even without the description of these details. Additionally, to avoid unnecessary confusion to the essence of the present utility model, well-known methods, processes, procedures, components, and circuits, etc. have not been described in detail.

[0040] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A twin-screw extruder for producing cable sheath material, comprising a base plate (1) and a twin-screw extruder body (2), characterized in that: The twin-screw extruder body (2) is provided with a conveying part (5), and the conveying part (5) comprises: A conveying cylinder (52) is arranged on the twin-screw extruder body (2), and the conveying cylinder (52) is connected to the twin-screw extruder body (2) through a conveying pipe; A driving motor (51) is arranged on one side of the conveying cylinder (52); A conveying rod (56), one end of which is disposed in the conveying cylinder (52) and the other end of which is connected to the output end of the driving motor (51); A first conveying sheet (55) is arranged on the conveying rod (56); A second conveying sheet (54), one end of which is arranged on the conveying rod (56) and the other end of which is connected to the first conveying sheet (55); The spiral angle of the first conveying sheet (55) is smaller than that of the second conveying sheet (54); A plurality of protrusions (53) are respectively arranged on the first conveying sheet (55) and the second conveying sheet (54).

2. The twin-screw extruder for producing cable sheath material according to claim 1, characterized in that: Also includes: The pretreatment section (6) is arranged above the conveying section (5), and the pretreatment section (6) comprises: A processing tank (62) is arranged on the twin-screw extruder body (2) via a support column, and the bottom of the processing tank (62) is connected to the conveying cylinder (52) via a connecting pipe; A stepping motor (61) is arranged on the top of the processing tank (62).

3. The twin-screw extruder for producing cable sheath material according to claim 2, characterized in that: Also includes: A rotating rod (65), one end of which is disposed in the processing tank (62), and the other end of which passes through the processing tank (62) and is connected to the output end of the stepping motor (61); Two first stirring rods (63) are arranged on the rotating rod (65), and the first stirring rods (63) are L-shaped.

4. The twin-screw extruder for producing cable sheath material according to claim 3, characterized in that: Also includes: A plurality of second stirring rods (64) are arranged on the rotating rod (65), and the plurality of second stirring rods (64) are distributed in a staggered manner.

5. The twin-screw extruder for producing cable sheath material according to claim 4, characterized in that: The second stirring rod (64) comprises: Outer layer (643); An inner layer (641) disposed inside the outer layer (643); The heating layer (642) is arranged between the outer layer (643) and the inner layer (641).

6. The twin-screw extruder for producing cable sheath material according to claim 1, characterized in that: Also includes: A plurality of exhaust ports (3) are arranged on the twin-screw extruder body (2); An exhaust portion (4) is arranged on the bottom plate (1), and the exhaust portion (4) comprises: A U-shaped tube (41) detachably arranged on the exhaust port (3); An exhaust pipe (42) is arranged in communication with the bottom of the U-shaped pipe (41).

7. The twin-screw extruder for producing cable sheath material according to claim 6, characterized in that: Also includes: A protection frame (43) is arranged on the bottom plate (1); An exhaust fan (46) is arranged in the protection frame (43); A purification box (45) is arranged in the protection frame (43), and the air suction end of the exhaust fan (46) is connected to the purification box (45); A channel pipe (44) has one end connected to the purification box (45) and the other end connected to the exhaust pipe (42).

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