A stepwise advancing type plastic extruder

Abstract

The utility model discloses a kind of hierarchical advancing type plastic extruders, it is related to extruder equipment technical field, including advancing rod, first helical blade, second helical blade, first baffle and second baffle.The first helical blade and second helical blade in the utility model carry out helical advancing treatment to plastic raw materials on advancing rod outer wall, and further realize the hierarchical advancing treatment to plastic raw materials;First baffle carries out check treatment in the helical conveying process of first helical blade, second baffle carries out check treatment in the helical conveying process of second helical blade, so that plastic raw materials can be blocked backflow treatment to plastic raw materials in helical advancing conveying process, so that plastic raw materials can be continuously backflow mixing treatment in helical advancing conveying process, can effectively improve the mixing uniformity of plastic raw materials in molten state, so that subsequent plastic extrusion molding product quality is better.

Description

Technical Field

[0001] This utility model relates to the field of extruder equipment technology, specifically a staged propulsion type plastic extruder. Background Technology

[0002] Plastic extruders (main machines) can be matched with various plastic molding auxiliary machines such as pipes, films, strapping, rods, monofilaments, flat wires, extruded mesh, sheets, profiles, cable sheathing, and granulation machines to form various plastic extrusion molding production lines for producing various plastic products. Extrusion is mainly used for molding thermoplastic plastics, but it can also be used for some thermosetting plastics. In the production process of urine bags or drainage bags, the raw materials need to be extruded first, and then other operations are carried out.

[0003] Patent (CN222201600U) discloses a plastic extruder, including an extruder body and a pad block disposed at the bottom of the extruder body. A feed pipe is fixedly connected to the extruder body, and a feed hopper is fixedly connected to the feed pipe. The feed hopper is provided with a crushing mechanism for crushing large-volume plastic. The crushing mechanism includes two crushing rollers. The feed pipe is provided with spiral blades for feeding. This utility model uses a crushing mechanism to crush large-volume plastic. The crushed plastic falls into the feed pipe. A first motor drives the spiral blades to rotate, thereby conveying the plastic in the feed pipe into the extruder body. The crushing mechanism allows the extruder body to quickly melt large-volume plastic, and then convey it through the rotating spiral blades, avoiding plastic blockage in the feed pipe.

[0004] The plastic extruder in the aforementioned patent uses a single-rotation spiral blade to transport plastic raw materials, and at the same time heats and melts the plastic raw materials during the transport process. However, the plastic raw materials are basically transported in the same direction of rotation, resulting in poor uniformity of mixing of the molten plastic raw materials, which leads to poor quality of the subsequent plastic extrusion products. Utility Model Content

[0005] The purpose of this invention is to provide a graded propulsion type plastic extruder to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a graded propulsion type plastic extruder, including an extruder main unit, a feeding cylinder vertically provided at one end of the top of the extruder main unit, a rotatably connected propulsion rod provided inside the extruder main unit, a first helical blade provided at one end of the outer wall of the propulsion rod, a second helical blade provided at the other end of the outer wall of the propulsion rod, and the first helical blade and the second helical blade are connected, the first helical blade and the second helical blade have the same rotation direction, a plurality of first baffles are provided on the outer wall of the propulsion rod at the helical gap of the first helical blade, and a plurality of second baffles are provided on the outer wall of the propulsion rod at the helical gap of the second helical blade.

[0007] Furthermore, the first baffle has a spiral structure, the inner and outer diameters of the first baffle and the first spiral blade are the same, the spiral angles of the first baffle and the first spiral blade are opposite, and the number of spiral turns of the first baffle is greater than one-third and less than two-thirds.

[0008] Furthermore, the second baffle has a spiral structure, and the inner and outer diameters of the second baffle and the second spiral blade are the same. The spiral angles of the second baffle and the second spiral blade are opposite, and the number of spiral turns of the second baffle is greater than one-third and less than two-thirds.

[0009] Furthermore, the extruder main unit also includes a first servo motor. The output shaft of the first servo motor is connected to one end of the push rod through a reducer and a coupling. The first helical blade is located on the outer wall of the push rod near the end of the first servo motor. The pitch of the first helical blade gradually decreases from the end near the first servo motor to the other end. The pitch of the second helical blade is less than the minimum pitch of the first helical blade.

[0010] Furthermore, a rotating stirring shaft is vertically connected to the center of the feeding cylinder, and a second servo motor is provided at the top of the feeding cylinder. The second servo motor is connected to the top of the stirring shaft through a reducer and a coupling. A feed inlet is provided on one side of the top of the feeding cylinder.

[0011] Furthermore, a first spiral frame is horizontally provided on one side of the top of the outer wall of the stirring shaft, a third spiral blade is provided at the bottom of the outer wall of the stirring shaft, a second spiral frame is provided on the other side of the outer wall of the stirring shaft above the third spiral blade, a plurality of third and fourth spiral frames are inclinedly provided on one side of the outer wall of the stirring shaft below the first spiral frame, and a plurality of fifth spiral frames are inclinedly provided on the other side of the outer wall of the stirring shaft above the second spiral frame.

[0012] Furthermore, the third and fourth spiral frames are inclined downwards on the outer wall of the stirring shaft, and the fifth spiral frame is inclined upwards on the outer wall of the stirring shaft.

[0013] Furthermore, the fourth spiral frame is positioned below the third spiral frame, and the length of the fourth spiral frame is less than the length of the third spiral frame.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0015] 1. This utility model, by setting up a push rod, a first spiral blade, a second spiral blade, a first baffle, and a second baffle, allows the push rod to rotate and propel the plastic raw material inside the extruder. The plastic raw material undergoes primary propulsion under the spiral action of the first spiral blade and secondary propulsion under the spiral action of the second spiral blade, thus achieving graded propulsion of the plastic raw material. The first baffle and the second baffle provide obstruction during the spiral conveying process of the first and second spiral blades, preventing backflow of the plastic raw material during the spiral propulsion process. The plastic raw material undergoes a backflow motion once for each spiral gap advanced by the first and second spiral blades, resulting in continuous backflow mixing during the spiral propulsion process. This effectively improves the mixing uniformity of the plastic raw material in the molten state, leading to better quality extruded products.

[0016] 2. In this utility model, during the rotation of the stirring shaft, the first spiral frame performs horizontal circumferential spiral stirring on the top of the inner wall of the feeding cylinder, and the third spiral blade performs spiral stirring on the bottom of the feeding cylinder on the outer wall of the stirring shaft. This effectively prevents blockage of the plastic material when it is conveyed to the extruder main unit. The second spiral frame performs horizontal circumferential spiral stirring on the plastic material above the third spiral blade. The third and fourth spiral frames perform inclined circumferential spiral stirring on the plastic material below the first spiral frame, and the fifth spiral frame performs inclined circumferential spiral stirring on the plastic material above the second spiral frame. The movement trajectories of the first, second, third, fourth, and fifth spiral frames inside the feeding cylinder intersect, which can effectively improve the stirring and mixing effect of the plastic material. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the push rod structure of this utility model;

[0020] Figure 3 This is a structural schematic diagram of the push rod of this utility model from another angle;

[0021] Figure 4 This is a schematic diagram of the structure of the stirring shaft of this utility model;

[0022] In the diagram: 1. Extruder main unit; 101. First servo motor; 2. Feeding cylinder; 201. Stirring shaft; 202. Second servo motor; 203. Feed inlet; 204. First screw frame; 205. Third screw blade; 206. Second screw frame; 207. Third screw frame; 208. Fourth screw frame; 209. Fifth screw frame; 3. Push rod; 4. First screw blade; 5. Second screw blade; 6. First baffle; 7. Second baffle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4This utility model provides a technical solution: a graded propulsion type plastic extruder, including an extruder main unit 1, a feeding cylinder 2 vertically mounted at one end of the top of the extruder main unit 1, a rotatably connected propulsion rod 3 inside the extruder main unit 1, a first helical blade 4 at one end of the outer wall of the propulsion rod 3, and a second helical blade 5 at the other end of the outer wall of the propulsion rod 3, with the first helical blade 4 and the second helical blade 5 connected, the first helical blade 4 and the second helical blade 5 having the same direction of rotation, a plurality of first baffles 6 provided on the outer wall of the propulsion rod 3 at the helical gap of the first helical blade 4, and a plurality of second baffles 7 provided on the outer wall of the propulsion rod 3 at the helical gap of the second helical blade 5; the first baffles 6 have a helical structure, and the inner and outer diameters of the first baffles 6 and the first helical blade 4 are the same, the first baffles 6 and the first helical blade 4 are connected, and the first helical blade 4 and the second helical blade 5 are connected, with the first helical blade 4 and the second helical blade 5 having the same direction of rotation, ... The spiral angles of the blades 4 are opposite. The number of spiral turns of the first baffle 6 is greater than one-third and less than two-thirds. The second baffle 7 has a spiral structure. The inner and outer diameters of the second baffle 7 and the second spiral blade 5 are the same. The spiral angles of the second baffle 7 and the second spiral blade 5 are opposite. The number of spiral turns of the second baffle 7 is greater than one-third and less than two-thirds. The extruder main unit 1 also includes a first servo motor 101. The output shaft of the first servo motor 101 is connected to one end of the push rod 3 through a reducer and a coupling. The first spiral blade 4 is located on the outer wall of the push rod 3 near the end of the first servo motor 101. The pitch of the first spiral blade 4 gradually decreases from the end near the first servo motor 101 to the other end. The pitch of the second spiral blade 5 is less than the minimum pitch of the first spiral blade 4.

[0025] In one embodiment, a rotating stirring shaft 201 is vertically and rotatably connected to the center of the feeding cylinder 2. A second servo motor 202 is provided at the top of the feeding cylinder 2. The second servo motor 202 is connected to the top of the stirring shaft 201 through a reducer and a coupling. A feed inlet 203 is provided on one side of the top of the feeding cylinder 2. The feed inlet 203 is used to feed plastic raw materials into the feeding cylinder 2. The second servo motor 202 can drive the stirring shaft 201 to rotate through the reducer and coupling. The stirring shaft 201 stirs the plastic raw materials inside the feeding cylinder 2, which can effectively improve the mixing uniformity of the plastic raw materials.

[0026] In one embodiment, a first spiral frame 204 is horizontally arranged on one side of the top of the outer wall of the stirring shaft 201, a third spiral blade 205 is arranged at the bottom of the outer wall of the stirring shaft 201, a second spiral frame 206 is arranged on the other side of the outer wall of the stirring shaft 201 above the third spiral blade 205, a plurality of third spiral frames 207 and fourth spiral frames 208 are inclinedly arranged on one side of the outer wall of the stirring shaft 201 below the first spiral frame 204, and a plurality of fifth spiral frames 209 are inclinedly arranged on the other side of the outer wall of the stirring shaft 201 above the second spiral frame 206. During the rotation of the stirring shaft 201, the first spiral frame 204 performs horizontal circumferential spiral stirring on the top of the inner wall of the feed cylinder 2, and the third spiral blade 205 is on the outer wall of the stirring shaft 201. The spiral stirring of the plastic raw material at the bottom of the feeding cylinder 2 can effectively prevent blockage when the plastic raw material is conveyed to the extruder main unit 1. The second spiral frame 206 performs horizontal circumferential spiral stirring of the plastic raw material above the third spiral blade 205. The third spiral frame 207 and the fourth spiral frame 208 perform inclined circumferential spiral stirring of the plastic raw material below the first spiral frame 204. The fifth spiral frame 209 performs inclined circumferential spiral stirring of the plastic raw material above the second spiral frame 206. The movement trajectories of the first spiral frame 204, the second spiral frame 206, the third spiral frame 207, the fourth spiral frame 208 and the fifth spiral frame 209 inside the feeding cylinder 2 intersect, which can effectively improve the stirring and mixing effect of the plastic raw material.

[0027] In one embodiment, the third spiral frame 207 and the fourth spiral frame 208 are inclined downwards and disposed on the outer wall of the stirring shaft 201, while the fifth spiral frame 209 is inclined upwards and disposed on the outer wall of the stirring shaft 201. This arrangement results in the movement trajectories of the third spiral frame 207 and the fourth spiral frame 208 exhibiting a conical structure distribution, and the movement trajectory of the fifth spiral frame 209 exhibiting an inverted conical structure distribution. This can effectively improve the diversity of the stirring motion of the plastic raw material inside the feed cylinder 2 and improve the stirring uniformity of the plastic raw material.

[0028] In one embodiment, the fourth spiral frame 208 is located below the third spiral frame 207, and the length of the fourth spiral frame 208 is less than the length of the third spiral frame 207, so that the rotational stirring radii of the third spiral frame 207 and the fourth spiral frame 208 inside the feed cylinder 2 are different, which can further improve the stirring and mixing effect of plastic raw materials.

[0029] The working principle of this utility model:

[0030] Refer to the instruction manual appendix Figures 1-4This invention utilizes a push rod 3, a first helical blade 4, a second helical blade 5, a first baffle 6, and a second baffle 7. The extruder main unit 1 is used for extruding plastic raw materials, and the feeding cylinder 2 is used for feeding the extruder main unit 1. The push rod 3 rotates and propels the plastic raw material inside the extruder main unit 1. The first helical blade 4 and the second helical blade 5 spirally propel the plastic raw material on the outer wall of the push rod 3. The plastic raw material undergoes primary propulsion under the spiral action of the first helical blade 4 and secondary propulsion under the spiral action of the second helical blade 4, thus achieving graded propulsion of the plastic raw material. The first baffle 6 provides obstruction during the spiral conveying process of the first helical blade 4, ensuring that the plastic raw material... During the spiral conveying process, the plastic raw material can be blocked and refluxed. Each time the first spiral blade 4 advances one spiral gap, the plastic raw material undergoes a reflux motion, allowing for continuous reflux mixing during the spiral conveying process. The second baffle 7 further blocks the flow of the plastic raw material during the spiral conveying process of the second spiral blade 5, preventing reflux. Each time the second spiral blade 5 advances one spiral gap, the plastic raw material undergoes a reflux motion, allowing for continuous reflux mixing during the spiral conveying process. This effectively improves the mixing uniformity of the plastic raw material in the molten state, resulting in better quality products after subsequent plastic extrusion molding.

[0031] The first baffle 6 is designed with a spiral structure, and the inner and outer diameters of the first baffle 6 and the first spiral blade 4 are the same. The spiral angles of the first baffle 6 and the first spiral blade 4 are opposite, which can effectively prevent the molten plastic material from passing through the gap between the outer wall of the first baffle 6 and the inner wall of the extruder main unit 1. This allows the molten plastic material to move only along the surface of the first baffle 6, and the molten plastic material is returned along a spiral motion opposite to the spiral conveying direction of the first spiral blade 4. The number of spiral turns of the first baffle 6 is greater than one-third and less than two-thirds, ensuring that the first baffle 6 can normally block the spiral gap of the first spiral blade 4, while preventing the first baffle 6 from completely closing the spiral gap of the first spiral blade 4. This allows the first baffle 6 to normally block the backflow of the molten plastic material, while also ensuring that the molten plastic material can be normally pushed and conveyed.

[0032] The second baffle 7 is designed with a spiral structure, and the inner and outer diameters of the second baffle 7 and the second spiral blade 5 are the same. The spiral angles of the second baffle 7 and the second spiral blade 5 are opposite, which can effectively prevent the molten plastic material from passing through the gap between the outer wall of the second baffle 7 and the inner wall of the extruder main unit 1. This allows the molten plastic material to move only along the surface of the second baffle 7, and the molten plastic material is returned along a spiral motion opposite to the spiral conveying direction of the second spiral blade 5. The number of spiral turns of the second baffle 7 is greater than one-third and less than two-thirds, ensuring that the second baffle 7 can normally block the spiral gap of the second spiral blade 5, while preventing the second baffle 7 from completely closing the spiral gap of the second spiral blade 5. This allows the second baffle 7 to normally block the backflow of the molten plastic material, while also ensuring that the molten plastic material can be normally pushed and conveyed.

[0033] The second servo motor 101 drives the push rod 3 to rotate via a reducer and coupling. The plastic material first enters the first spiral blade 4 on the outside of the push rod 3, so that the first spiral blade 4 first performs spiral propulsion and conveying of the plastic material, and then the second spiral blade 4 performs spiral propulsion and conveying of the plastic material. The pitch of the first spiral blade 4 is designed to gradually decrease from one end close to the first servo motor 101 to the other end, so that after the plastic material enters the outside of the push rod 3, the large pitch of the first spiral blade 4 has a better receiving effect on the plastic material and a better conveying effect on the plastic material.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A staged propulsion type plastic extruder, comprising an extruder main unit (1), characterized in that: The extruder main unit (1) has a feed cylinder (2) vertically mounted at one end of its top. The extruder main unit (1) has a rotating push rod (3) inside. One end of the outer wall of the push rod (3) has a first helical blade (4), and the other end of the outer wall of the push rod (3) has a second helical blade (5). The first helical blade (4) and the second helical blade (5) are connected. The first helical blade (4) and the second helical blade (5) have the same rotation direction. The outer wall of the push rod (3) has several first baffles (6) in the helical gap of the first helical blade (4), and the outer wall of the push rod (3) has several second baffles (7) in the helical gap of the second helical blade (5).

2. The graded propulsion type plastic extruder according to claim 1, characterized in that: The first baffle (6) has a spiral structure. The inner diameter and outer diameter of the first baffle (6) and the first spiral blade (4) are the same. The spiral angles of the first baffle (6) and the first spiral blade (4) are opposite. The number of spiral turns of the first baffle (6) is greater than one-third and less than two-thirds.

3. The graded propulsion type plastic extruder according to claim 1, characterized in that: The second baffle (7) has a spiral structure. The inner diameter and outer diameter of the second baffle (7) and the second spiral blade (5) are the same. The spiral angles of the second baffle (7) and the second spiral blade (5) are opposite. The number of spiral turns of the second baffle (7) is greater than one-third and less than two-thirds.

4. A staged propulsion type plastic extruder according to claim 1, characterized in that: The extruder main unit (1) also includes a first servo motor (101). The output shaft of the first servo motor (101) is connected to one end of the push rod (3) through a reducer and a coupling. The first helical blade (4) is located on the outer wall of the push rod (3) near the end of the first servo motor (101). The pitch of the first helical blade (4) gradually decreases from one end near the first servo motor (101) to the other end. The pitch of the second helical blade (5) is less than the minimum pitch of the first helical blade (4).

5. A staged propulsion type plastic extruder according to claim 1, characterized in that: The feeding cylinder (2) has a vertically connected stirring shaft (201) at its center. The top of the feeding cylinder (2) has a second servo motor (202). The second servo motor (202) is connected to the top of the stirring shaft (201) through a reducer and a coupling. The top side of the feeding cylinder (2) has a feed inlet (203).

6. A staged propulsion type plastic extruder according to claim 5, characterized in that: A first spiral frame (204) is horizontally arranged on one side of the top of the outer wall of the stirring shaft (201). A third spiral blade (205) is arranged at the bottom of the outer wall of the stirring shaft (201). A second spiral frame (206) is arranged above the third spiral blade (205) on the other side of the outer wall of the stirring shaft (201). Several third spiral frames (207) and fourth spiral frames (208) are inclinedly arranged below the first spiral frame (204) on one side of the outer wall of the stirring shaft (201). Several fifth spiral frames (209) are inclinedly arranged above the second spiral frame (206) on the other side of the outer wall of the stirring shaft (201).

7. A staged propulsion type plastic extruder according to claim 6, characterized in that: The third spiral bracket (207) and the fourth spiral bracket (208) are inclined downwards on the outer wall of the stirring shaft (201), and the fifth spiral bracket (209) is inclined upwards on the outer wall of the stirring shaft (201).

8. A staged propulsion type plastic extruder according to claim 7, characterized in that: The fourth spiral frame (208) is located below the third spiral frame (207), and the length of the fourth spiral frame (208) is less than the length of the third spiral frame (207).

Images