CN211942009U

CN211942009U - Ultrahigh molecular material extrusion screw structure

Info

Publication number: CN211942009U
Application number: CN202020626734.1U
Authority: CN
Inventors: 吴宝东
Original assignee: Yangzhou Weidong Transmission Equipment Co ltd
Current assignee: Yangzhou Weidong Transmission Equipment Co ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-11-17
Anticipated expiration: 2030-04-23

Abstract

The utility model discloses an ultra-high molecular material extrusion screw structure, which comprises a charging barrel and a screw, wherein the screw comprises a first sub-screw, and the outer surface of the first sub-screw is provided with a positive spiral thread; the charging barrel comprises a first sub-charging barrel, a feeding hole is formed in the side face, close to the initial end of the first sub-charging barrel, reverse spiral threads are formed in the inner surface of the first sub-charging barrel, a discharging hole is formed in the side face, close to the tail end of the first sub-charging barrel, and the distance between the discharging hole and the initial end of the first sub-charging barrel is 0.50-0.70 of the length of the charging barrel. The structure can ensure that the ultrahigh molecular powder injected from the feed inlet is extruded from the discharge outlet when the ultrahigh molecular powder does not reach a molten state, the state of the ultrahigh molecular material during production is changed, the difficulty caused by the special melt property of the ultrahigh molecular material is avoided, and the bamboo joint phenomenon can not occur on the surface of a finished product of the ultrahigh molecular material, so that the surface smoothness of the finished product is not influenced.

Description

Ultrahigh molecular material extrusion screw structure

Technical Field

The utility model relates to a super high molecular material production technical field, concretely relates to super high molecular material extrudes screw rod structure.

Background

The processing and molding of the ultra-high molecular weight polyethylene material generally adopts a screw extrusion method. The extrusion system of the extruder in the prior art is composed of a charging barrel, a screw, a base, a bracket and the like. An axial groove is formed in the charging barrel, the bolt is provided with threads which are connected end to end and are in the same direction, and the tail end of the charging barrel is connected with the discharging port and the die. The ultrahigh molecular polyethylene material is injected from a feed port of a charging barrel, and is subjected to screw conveying, the powdery ultrahigh molecular polyethylene material is gradually melted and plasticized under the actions of screw shearing and external heat of the charging barrel, is extruded under high temperature and high pressure of a die at a discharge port and is then cooled and formed, and is heated, sheared and plasticized in the screw conveying process of the screw, and finally is continuously extruded, so that automatic production is realized.

Due to the macromolecular chain characteristics of the ultrahigh molecular material, the extrusion molding of the ultrahigh molecular material requires longer time due to intermolecular structural stress, and melt fracture also occurs, which affects the production efficiency and quality. Meanwhile, in the production process, the finished product of the ultrahigh molecular material has bamboo joint phenomenon, which affects the surface smoothness of the finished product.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides an ultra-high molecular material extrusion screw structure to solve the problem that the finished product of ultra-high molecular material in the prior art has bamboo joint phenomenon on the surface, which affects the surface smoothness, but does not affect the compaction density and strength quality of the finished product.

In order to achieve the above object, the present invention provides the following technical solutions:

according to the utility model, an ultra-high molecular material extrusion screw structure is provided, which comprises a charging barrel and a screw, wherein the screw comprises a first sub-screw, and the outer surface of the first sub-screw is provided with a positive spiral thread; the feed cylinder includes first sub-feed cylinder, first sub-feed cylinder is being close to be equipped with the feed inlet on the side of first sub-feed cylinder initial end, the internal surface of first sub-feed cylinder is equipped with reverse spiral screw, first sub-feed cylinder is close to the terminal side department of first sub-feed cylinder is equipped with the discharge gate, the discharge gate with distance between the first sub-feed cylinder initial end is 0.50-0.70 of feed cylinder length.

Further, the screw rod further comprises a second sub-screw rod, the second sub-screw rod and the first sub-screw rod are integrally arranged, wherein the tail end of the first sub-screw rod is connected with the initial end of the second sub-screw rod; the outer surface of the second sub screw rod is provided with a reverse spiral thread;

the material barrel further comprises a second sub material barrel which is integrally arranged with the first sub material barrel, wherein the tail end of the first sub material barrel is connected with the initial end of the second sub material barrel; and the inner surface of the second sub-charging barrel is provided with a positive spiral thread.

Further, the feed inlet is funnel-shaped or cylindric.

Further, the distance between the discharge hole and the initial end of the first sub-charging barrel is 0.67 of the length of the charging barrel.

Further, still include the mould, the mould with the discharge gate adopts the components of a whole that can function independently setting mode, the mould with the end connection of discharge gate.

Further, the screw rod is made of alloy steel.

Further, the material of feed cylinder is metal.

The utility model has the advantages of as follows:

the utility model discloses a set up the discharge gate in the terminal side department of first sub-feed cylinder, and make the distance between discharge gate and the first sub-feed cylinder initial end be 0.50-0.70 of feed cylinder length, can make the super high molecular powder that injects from the feed inlet, through screw rod screw transport, powdered super high molecular material is under screw rod shearing and the external heating effect of feed cylinder, when not reaching the molten condition completely, extrude from the discharge gate, this structure has changed the state during production of super high molecular material, extrude from the fuse-element to become non-fuse-element, accord with the physicochemical property of super high molecular material itself, avoid the difficulty brought because of the special fuse-element property of super high molecular material, and can make the surface of the finished product of super high molecular material can not appear the bamboo joint phenomenon, do not influence its surface smoothness, the reverse spiral thread of second sub-screw rod, utilize the reverse spiral thrust of second sub-screw rod self, preventing the ultra-high material molecules from overflowing from the end of the cartridge.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

FIG. 1 is a schematic illustration of a screw according to an exemplary embodiment;

FIG. 2 is a schematic structural view of a cartridge shown in accordance with an exemplary embodiment;

in the figure: 11. a first sub-screw; 12. a second sub-screw; 13. a first sub-cartridge; 14. a second sub-cartridge; 15. a feed inlet; 16. a discharge port; 17. spline grooves.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

According to the embodiment of the utility model, an ultra-high molecular material extrusion screw structure is provided, including feed cylinder and screw rod, as shown in fig. 1, the screw rod includes first sub-screw rod 11, wherein, be equipped with positive helical thread on the surface of first sub-screw rod 11; as shown in fig. 2, the cartridge comprises a first sub-cartridge 13, the first sub-cartridge 13 is provided with a feed port 15 on the side near the initial end of the first sub-cartridge, the inner surface of the first sub-cartridge 13 is provided with a reverse spiral thread, the side of the first sub-cartridge 13 near the end of the first sub-cartridge is provided with a discharge port 16, and the distance L1 between the discharge port 16 and the initial end of the first sub-cartridge is 0.50-0.70 of the length L of the cartridge.

Wherein the positive helical thread on the outer surface of the first sub-screw 11 is continuous and penetrates through the outer surface of the first sub-screw 11, and the negative helical thread on the inner surface of the first sub-cylinder 13 is continuous and penetrates through the inner surface of the first sub-cylinder 13.

The embodiment of the utility model arranges the discharge port 16 at the side of the end of the first sub-charging barrel, and the distance L1 between the discharge port 16 and the initial end of the first sub-barrel is 0.50-0.70 of the length L of the barrel, the ultra-high molecular powder injected from the feed inlet 15 is conveyed by the screw in a spiral way, and under the shearing action of the screw and the external heat action of the charging barrel, when the material is not completely melted, the material is extruded from the discharge port 16, the structure changes the state of the ultrahigh molecular material during production, the melt extrusion is changed into non-melt extrusion, the physical and chemical properties of the ultrahigh molecular material are met, the difficulty caused by the special melt property of the ultrahigh molecular material is avoided, and the bamboo joint phenomenon can not occur on the surface of the finished product of the ultrahigh molecular material, the surface smoothness of the finished product is not influenced, and the compaction density and the strength quality of the finished product are not influenced.

In some optional embodiments, the screw further comprises a second sub-screw 12, the second sub-screw 12 is integrally disposed with the first sub-screw 11, wherein the end of the first sub-screw 11 is connected with the initial end of the second sub-screw 12; the outer surface of the second sub-screw 12 is provided with a reverse spiral thread; the reverse screw flight of the second sub-screw 12 prevents the ultra-high material molecules from overflowing from the end of the barrel by the reverse screw thrust of the second sub-screw 12 itself.

The cartridge further comprises a second sub-cartridge 14, the second sub-cartridge 14 is integrally arranged with the first sub-cartridge 13, wherein the tail end of the first sub-cartridge 13 is connected with the initial end of the second sub-cartridge 14; the inner surface of the second sub-barrel 14 is provided with a positive helical thread.

Wherein the positive helical thread on the outer surface of the second sub-screw 12 is continuous and runs through the outer surface of the second sub-screw 12, and the negative helical thread on the inner surface of the second sub-barrel 14 is continuous and runs through the inner surface of the second sub-barrel 14.

By arranging the reverse spiral threads on the outer surface of the second sub-screw 12 and the positive spiral threads on the inner surface of the second sub-barrel 14, the reverse spiral thrust can be matched between the reverse spiral threads and the positive spiral threads to supply ultrahigh molecular powder in the barrel, so that the powder is prevented from overflowing from the tail end of the barrel, namely from the tail end of the second sub-barrel 14.

In some alternative embodiments, the feed opening 15 is funnel-shaped or cylindrical. By providing the feed opening 15 in a funnel shape or a cylindrical shape, the ultra-high molecular powder can be more easily introduced into the barrel.

In some alternative embodiments, the distance L1 between the discharge port 16 and the first sub-cartridge initial end is 0.67 of the cartridge length L.

The location of the outlet 16 is of critical importance, in which the ultrahigh-molecular powder does not reach the molten state and does not become a melt. If the discharge port 16 is disposed near the end of the second sub-barrel 14, the ultrahigh-molecular powder may be in a completely molten state, which is disadvantageous for forming a smooth surface.

In some optional embodiments, the device further includes a mold (not shown), the mold and the discharge port are separately disposed, and the mold is connected to the end of the discharge port 16.

The mould is arranged at the discharge port 16, so that the shape processing of a finished product of the ultra-high molecular powder can be realized, the required shape can be produced, the mould can be conveniently replaced by adopting split arrangement, products with different shapes can be conveniently produced, and the corresponding mould can be selected and replaced according to the extruded product in specific requirements.

In some optional embodiments, the screw is made of alloy steel.

The screw rod is made of alloy steel, so that the screw rod is high-temperature resistant, corrosion resistant and long in service life.

In some optional embodiments, the material of the barrel is metal.

The material of the charging barrel is selected to be metal, so that the ultrahigh molecular powder can be heated by utilizing the heat-conducting property of the metal.

In some alternative embodiments, the left end of the first sub-screw 11 is provided with a spline groove 17 for connecting with other power mechanism to drive the screw to move.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The ultrahigh molecular material extrusion screw structure comprises a charging barrel and a screw, and is characterized in that the screw comprises a first sub-screw, wherein the outer surface of the first sub-screw is provided with a positive spiral thread;

the feed cylinder includes first sub-feed cylinder, first sub-feed cylinder is being close to be equipped with the feed inlet on the side of first sub-feed cylinder initial end, the internal surface of first sub-feed cylinder is equipped with reverse spiral screw, first sub-feed cylinder is close to the terminal side department of first sub-feed cylinder is equipped with the discharge gate, the discharge gate with distance between the first sub-feed cylinder initial end is 0.50-0.70 of feed cylinder length.

2. The ultra-high molecular material extrusion screw structure of claim 1, wherein the screw further comprises a second sub-screw integrally disposed with the first sub-screw, wherein a terminal end of the first sub-screw is connected to a terminal end of the second sub-screw; the outer surface of the second sub screw rod is provided with a reverse spiral thread;

3. The ultra-high molecular material extrusion screw structure of claim 1, wherein the feed inlet is funnel-shaped or cylindrical.

4. The ultra-high molecular material extrusion screw structure of claim 1, wherein the distance between the discharge port and the initial end of the first sub-barrel is 0.67 of the length of the barrel.

5. The ultra-high molecular material extrusion screw structure of claim 1, further comprising a mold, wherein the mold and the discharge port are arranged in a split manner, and the mold is connected with the tail end of the discharge port.

6. The ultra-high molecular material extrusion screw structure of claim 1, wherein the screw is made of alloy steel.

7. The ultra-high molecular material extrusion screw structure of claim 1, wherein the material of the barrel is metal.