Screw and extruder for extruding modified plastic particles for vehicles

Abstract

The utility model discloses a screw rod for extruding modified plastic particles for vehicles. The screw rod comprises a rod body, wherein the rod body sequentially comprises a transmission connection section, a feeding section, a compression section and a homogenization section from left to right; a cooling cavity is formed in the shell; the cooling assembly is detachably inserted into the cooling cavity, and the cooling assembly is matched with the inner wall of the cooling cavity to form a spiral cooling channel; the cooling assembly comprises a main shaft, spiral blades which are spirally distributed in the length direction of the main shaft and are in movable sealing fit with the inner wall of the cooling cavity, a water inlet channel formed in the central axis in the main shaft, and a water inlet formed in the inner side end of the main shaft and communicated with the water inlet channel. The water outlet is formed in the outer side end of the main shaft and is communicated with the water inlet channel; the bidirectional rotating joint is arranged at the tail part of the rod body and is communicated with the water inlet channel; and cooling water is introduced and discharged. Due to the design, the screw rod is fast and uniform in cooling. The utility model further discloses an extruder.

Description

Technical Field

[0001] This utility model relates to the field of extrusion equipment, and in particular to a screw and extruder for extruding modified plastic granules for automobiles. Background Technology

[0002] Common production methods for modified plastic granules for automobiles include blending modification, filler modification, fiber reinforcement modification, and chemical modification. Extruders are required in all of these production processes.

[0003] The working principle of a screw extruder is to rely on the pressure and shear force generated by the rotation of the screw to fully plasticize and uniformly mix the material, and finally form it through the die. Therefore, sometimes a single extruder can complete a series of processes such as mixing, plasticizing and forming at the same time, thus enabling continuous production.

[0004] In the production operation of screw extruders, the working condition of the screw directly affects the quality of the subsequent products. If the screw temperature is too high, it will cause defects such as carbonization of plastic particles, directly leading to the scrapping of subsequent products. It will also accelerate the wear of the screw, so timely cooling is necessary. However, existing cooling methods cannot cool the screw evenly and quickly, often resulting in uneven cooling and large temperature differences in different parts of the screw, leading to poor cooling effect. Utility Model Content

[0005] The purpose of this invention is to provide a screw for extruding modified plastic granules for automotive applications that provides rapid and uniform cooling.

[0006] The purpose of this utility model is achieved as follows: A screw for extruding modified plastic granules for automobiles includes a rod body, which, from left to right, includes a transmission connecting section, a feeding section, a compression section, and a homogenization section; a cooling chamber is provided inside; a cooling assembly is detachably inserted into the cooling chamber, and it cooperates with the inner wall of the cooling chamber to form a spiral cooling channel; the cooling assembly includes a main shaft, spiral blades spirally distributed along the length of the main shaft and movably sealingly cooperate with the inner wall of the cooling chamber, a water inlet channel disposed on the central axis inside the main shaft, a water inlet disposed on the inner end of the main shaft and connected to the water inlet channel, and a water outlet disposed on the outer end of the main shaft and connected to the water inlet channel; a bidirectional rotary joint is disposed at the tail of the rod body and connected to the water inlet channel; it is used to introduce and discharge cooling water.

[0007] Furthermore, the tail end of the aforementioned spindle is provided with an end cap and a positioning protrusion, the outer periphery of the aforementioned positioning protrusion is provided with a sealing groove, and a sealing ring is provided in the aforementioned sealing groove.

[0008] Furthermore, the aforementioned bidirectional rotary joint includes a housing, an inlet pipe and an outlet pipe on the outside of the housing, and an outer pipe and an inner pipe at the connection end between the housing and the cooling assembly. The outer pipe and the inner pipe extend through the end cap and into the outer end of the inlet channel. A flange is provided on the outer pipe and is fixed to the end cap by the flange. A sealing ring is provided at the outer end of the inner pipe to movably seal with the inner wall of the inlet channel. The inlet is connected to the inlet channel on the right side of the sealing ring, and the outlet is connected to the inlet channel on the left side of the sealing ring.

[0009] An extruder includes the aforementioned screw for extruding modified plastic pellets for automotive applications.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The screw provided by this utility model has a cooling chamber inside the rod body, and a cooling component is inserted in the cooling chamber. It cooperates with the inner wall of the cooling chamber to form a spiral cooling channel. A bidirectional rotary joint is also provided for water intake and drainage of the cooling channel. This design allows the cooling water to flow through the screw for a longer path and a larger contact area with the screw, resulting in more thorough contact, more uniform and rapid cooling, and also ensuring the structural strength of the screw. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the screw structure described in this utility model.

[0012] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0013] The components are as follows: 1. Transmission connection section; 2. Feeding section; 3. Compression section; 4. Homogenization section; 5. Cooling chamber; 6. Cooling channel; 7. Main shaft; 8. Spiral blade; 9. Water inlet channel; 10. Water inlet; 11. Water outlet; 12. End cover; 13. Positioning protrusion; 13a. Sealing groove; 13b. Sealing ring; 14. Housing; 15. Water inlet pipe; 16. Water outlet pipe; 17. Outer pipe; 17a. Flange; 18. Inner pipe; 18a. Sealing ring. Detailed Implementation

[0014] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0015] Combined with appendix Figure 1 , 2As shown, a screw for extruding modified plastic granules for automobiles includes a rod body, which, from left to right, includes a transmission connecting section 1, a feeding section 2, a compression section 3, and a homogenization section 4; a cooling chamber 5 is provided inside the rod body; a cooling assembly is detachably inserted into the cooling chamber 5, and it cooperates with the inner wall of the cooling chamber 5 to form a spiral cooling channel 6; the cooling assembly includes a main shaft 7, spiral blades 8 spirally distributed along the length of the main shaft 7 and movably sealingly cooperate with the inner wall of the cooling chamber 5, a water inlet channel 9 disposed on the central axis inside the main shaft 7, a water inlet 10 disposed on the inner end of the main shaft 7 and connected to the water inlet channel 9, and a water outlet 11 disposed on the outer end of the main shaft 7 and connected to the water inlet channel 9; and a bidirectional rotary joint disposed at the tail of the rod body and connected to the water inlet channel 9, which is used to introduce and discharge cooling water;

[0016] It should be noted that the pitch of the spiral blades 8 in the cooling chamber 5 corresponding to the compression section 3 and homogenization section 4 is narrower than that in the cooling chamber 5 corresponding to the feeding section 2. This design increases the flow path of the cooling channel 6 in the compression section 3 and homogenization section 4. Heating coils are provided on the outside of the barrel in the compression section 3 and homogenization section 4 of the rod body. Therefore, the temperature of the compression section 3 and homogenization section 4 of the rod body is also higher. In order to ensure the cooling effect, the cooling water needs to be in contact for a longer time.

[0017] The tail of the main shaft 7 is provided with an end cap 12 and a positioning protrusion 13. The outer periphery of the positioning protrusion 13 is provided with a sealing groove 13a, and a sealing ring 13b is provided in the sealing groove 13a. It should be noted that the end cap 12 is fixedly connected to the tail end of the rod by screws. The positioning protrusion 13 is fitted into the cooling cavity 5 at the tail end of the rod and is in a movable sealing fit with it.

[0018] The aforementioned bidirectional rotary joint includes a housing 14, with an inlet pipe 15 and an outlet pipe 16 on the outside of the housing 14. The connection end between the housing 14 and the cooling assembly is provided with an outer pipe 17 and an inner pipe 18. The outer pipe 17 and the inner pipe 18 extend through the end cap 12 and into the outer end of the water inlet channel 9. The outer pipe 17 is provided with a flange 17a and is fixed to the end cap 12 by the flange 17a. The outer end of the inner pipe 18 is provided with a sealing ring 18a that is movably sealed to the inner wall of the water inlet channel 9. The water inlet 10 is connected to the water inlet channel 9 on the right side of the sealing ring 18a, and the water outlet 11 is connected to the water inlet channel 9 on the left side of the sealing ring 18a.

[0019] It should be noted that the outer tube 17 can also be fixedly connected to the end cap 12 by threads.

[0020] An extruder includes the aforementioned screw for extruding modified plastic pellets for automotive applications.

[0021] When the screw is cooled, the cooling water flows into the housing 14 from the inlet pipe 15, flows into the inlet channel 9 on the right side of the sealing ring 18a through the inner pipe 18, reaches the inlet 10 after flowing through the inlet channel 9, enters the spiral cooling channel 6 through the inlet 10, flows into the inlet channel 9 on the left side of the sealing ring 18a through the outlet 11, then flows back into the housing 14 through the outer pipe 17, and finally flows out from the outlet pipe 16.

[0022] It should be noted that during the process of cooling water flowing through cooling channel 6, it comes into full contact with the inner wall of the rod, quickly and evenly absorbing the heat from all parts of the rod, thereby achieving a rapid and uniform cooling effect.

[0023] The straight-through water inlet channel 9 has low flow resistance, allowing cooling water to reach the innermost end of the rod cooling chamber 5 more quickly, thereby rapidly contacting the hotter parts of the rod and achieving a rapid cooling effect.

[0024] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A screw for extruding modified plastic granules for automotive applications, characterized in that: The screw includes The rod body, from left to right, includes a transmission connection section (1), a feeding section (2), a compression section (3), and a homogenization section (4); and has a cooling chamber (5) inside. The cooling assembly is detachably inserted into the cooling chamber (5), and it forms a spiral cooling channel (6) with the inner wall of the cooling chamber (5); the cooling assembly includes a main shaft (7), spiral blades (8) spirally distributed along the length of the main shaft (7) and movably sealed with the inner wall of the cooling chamber (5), a water inlet channel (9) disposed on the central axis inside the main shaft (7), a water inlet (10) disposed on the inner end of the main shaft (7) and connected to the water inlet channel (9), and a water outlet (11) disposed on the outer end of the main shaft (7) and connected to the water inlet channel (9). A bidirectional rotary joint is provided at the tail of the rod and is connected to the water inlet channel (9); it is used to introduce and discharge cooling water.

2. The screw for extruding modified plastic granules for automotive applications according to claim 1, characterized in that: The tail of the main shaft (7) is provided with an end cap (12) and a positioning protrusion (13). The outer periphery of the positioning protrusion (13) is provided with a sealing groove (13a), and a sealing ring (13b) is provided in the sealing groove (13a).

3. The screw for extruding modified plastic granules for automotive applications according to claim 2, characterized in that: The bidirectional rotary joint includes a housing (14), with an inlet pipe (15) and an outlet pipe (16) on the outside of the housing (14). The connection end between the housing (14) and the cooling assembly is provided with an outer pipe (17) and an inner pipe (18). The outer pipe (17) and the inner pipe (18) extend through the end cap (12) into the outer end of the water inlet channel (9). The outer tube (17) is provided with a flange (17a) and is fixed to the end cover (12) by the flange (17a); the outer end of the inner tube (18) is provided with a sealing ring (18a) that is movably sealed to the inner wall of the water inlet channel (9); the water inlet (10) is connected to the water inlet channel (9) on the right side of the sealing ring (18a), and the water outlet (11) is connected to the water inlet channel (9) on the left side of the sealing ring (18a).

4. An extruder, characterized in that: The extruder includes a screw for extruding modified plastic pellets for automobiles as described in any one of claims 1 to 3.

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