CN217704641U

CN217704641U - Extrusion screw

Info

Publication number: CN217704641U
Application number: CN202221932747.7U
Authority: CN
Inventors: 何海潮; 刘雪超
Original assignee: SUZHOU JWELL PRECISION MACHINERY CO Ltd
Current assignee: SUZHOU JWELL PRECISION MACHINERY CO Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-11-01
Anticipated expiration: 2032-07-26

Abstract

The application discloses an extrusion screw, which comprises a rod body extending from front to back, wherein the rod body comprises a barrier section, the barrier section is close to the back end part of the rod body, the barrier section comprises a plurality of main edges extending spirally along the axial direction, a feed chute and a discharge chute which are parallel to the main edges are concavely arranged between every two adjacent main edges, an auxiliary edge which is parallel to the main edges is formed between the feed chute and the discharge chute, a plurality of splitter boxes for communicating the feed chute and the discharge chute are arranged on the auxiliary edge, and the splitter boxes are sequentially distributed from front to back; the utility model provides a set up the splitter box on bellied secondary arris between feed chute and the blown down tank, both guaranteed the shearing plastify effect, reduced shear temperature again, the prevention overtemperature, the protective screen section after the improvement has the effect of shearing plastify and reposition of redundant personnel mixing concurrently, makes output and plastify quality further improve.

Description

Extrusion screw

Technical Field

The application relates to the technical field of plastic extrusion equipment, in particular to an extrusion screw.

Background

The barrier structure for plastic extrusion screw at present is all through setting up barrier business turn over, go out the groove to hinder solid phase to pass through, and impel solid phase fused, only be less than the barrier clearance after the material melts, can go from barrier business turn over groove to barrier business turn over groove. The barrier gap thus controls the intensity of the shear and the melt throughput, but the throughput and the shear effect are in a conflicting relationship, thus limiting the functional effect of such elements.

Disclosure of Invention

The purpose of this application is to solve among the prior art melt flow volume little, increase melt flow volume can influence the problem of shearing force.

In order to achieve the purpose, the technical scheme is as follows: the utility model provides an extrude screw rod, includes the body of rod that extends from preceding backward, the body of rod include the barrier section, the barrier section be close to the back tip of the body of rod, the barrier section include a plurality of main arriss that extend along axial spiral, adjacent two main arriss between concave be equipped with parallel feed chute and blown down tank of main arriss, the feed chute with the blown down tank between form with the parallel vice arris of main arris, vice arris on be provided with the intercommunication the feed chute with a plurality of splitter box of blown down tank, a plurality of the splitter box distribute in proper order from preceding backward.

In the above technical solution, it is further preferable that the main ridge and the axial line of the rod body form an included angle θ, and the included angle θ is 30 ° to 45 °.

In the above technical solution, it is further preferable that each of the splitter boxes has a center line perpendicular to the axial line, and a distance d between center lines of two adjacent splitter boxes on each of the minor ridges is 10mm to 20mm.

In the above technical solution, it is further preferable that the depth H of the splitter box is 1mm to 2mm.

In the above technical solution, it is further preferable that the front end face of the barrier segment and a plane perpendicular to the axial line form an included angle γ₁The back end face of the barrier section and a plane perpendicular to the axial lead form an included angle gamma₂Said angle γ being included₁And said angle gamma₂Equal, said angle γ₁Is 30-45 degrees.

In the above technical solution, it is further preferable that the front end of the feed chute is open, the rear end of the feed chute is closed, and an included angle α is formed between the chute bottom of the rear end of the feed chute and the chute wall surface, and the included angle α is 150 ° to 170 °.

In the above technical solution, it is further preferable that the front end of the discharge chute is closed, the rear end of the discharge chute is open, an included angle β is formed between the bottom of the front end of the discharge chute and the wall surface of the discharge chute, and the included angle β is 150 ° to 170 °.

Compared with the prior art, the application has the following beneficial effects:

the utility model provides a set up the splitter box on bellied secondary arris between feed chute and the blown down tank, both guaranteed the shearing plastify effect, reduced shear temperature again, the prevention overtemperature, the protective screen section after the improvement has the effect of shearing plastify and reposition of redundant personnel mixing concurrently, makes output and plastify quality further improve.

Drawings

FIG. 1 is a schematic view of a barrier section of an extrusion screw according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the barrier segment of FIG. 1 in an expanded configuration;

FIG. 3 isbase:Sub>A partial cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a partial cross-sectional view taken along line B-B of FIG. 2;

fig. 5 is a partially schematic view of the minor rib of fig. 2 in an expanded configuration.

Wherein: 1. a barrier section; 11. a main edge; 12. a feed chute; 13. a discharge chute; 14. a minor edge; 15. a splitter box.

Detailed Description

To explain the technical content, the structural features, the achieved objects and the functions of the application in detail, the technical solutions in the embodiments of the application will be described below with reference to the drawings in the embodiments of the application, and it is obvious that the described embodiments are only a part of the embodiments of the application, and not all embodiments. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. Moreover, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the particular shapes, configurations and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

In the description of the present application, "a plurality" means two or more unless otherwise specified.

The terms "front" and "back" as used herein refer to the front and back as shown in FIG. 1.

The embodiment of the application provides an extrusion screw, this extrusion screw includes the body of rod that extends from preceding back, and the body of rod includes the barrier section 1 of neighbouring back tip, includes many main arriss 11 along the direction spiral extension of the axial lead X1 of the body of rod on the barrier section 1, and the concave feed chute 12 and the blown down tank 13 that are parallel with main arris 11 that are equipped with between two adjacent main arriss 11, form the vice arris 14 parallel with main arris 11 between feed chute 12 and the blown down tank 13, still seted up a plurality of splitter box 15 on the vice arris 14.

As shown in fig. 1 and 2, a plurality of main ribs 11 are equidistantly distributed along the radial direction of the rod body, and each main rib 11 forms an included angle theta with the axial lead X1, wherein the included angle theta is 30-45 degrees.

As shown in fig. 1, 2 and 3, the feed chute 12 extends spirally along the axis X1 in parallel with the main edge 11, the front end of the feed chute 12 is an opening capable of communicating with the previous section, the rear end of the feed chute 12 is closed, an included angle α of 150 ° to 170 ° is formed between the chute bottom and the chute wall surface at the rear end of the feed chute 12, and an arc with a radius of R15 to R30 is formed between the chute bottom and the chute wall surface.

As shown in fig. 1, 2 and 4, the discharge chute 13 extends spirally along the axial line X1 in parallel with the main edge 11, the front end of the discharge chute 13 is closed, the rear end of the discharge chute 13 is an opening capable of being connected with the rear section, an included angle β of 150 ° to 170 ° is formed between the bottom of the front end of the discharge chute 13 and the wall surface of the chute, and an arc with the radius of R15 to R30 is formed between the bottom of the chute and the wall surface of the chute. The angle design of feed chute 12 and blown down tank 13 has avoided screw motion to change rectilinear motion's energy loss and root vortex and stock phenomenon, accords with the screw rod rotary motion trend, prevents to cross the plastify, and the burnt material blackens, improves conveying efficiency and plastify effect, and the circular arc gentle slope transition of tank bottom also makes the material stream can cross the protective screen clearance more steadily, prevents to extrude undulant production.

As shown in fig. 1 and 2, a minor rib 14 is formed between the feed chute 12 and the discharge chute 13 between two adjacent major ribs 11, and the minor rib 14 is used for preventing solid-phase material in the feed chute 12 from passing through the discharge chute 13 and cooperating with the major ribs 11 under rotation of the screw to increase shearing force to the material in the feed chute 12.

As shown in fig. 1, 2 and 5, each secondary edge 14 is further provided with a plurality of splitter boxes 15 distributed sequentially from front to back, and each splitter box 15 has a center line X2 perpendicular to the axis line X1; on each secondary edge 14, a distance d of 10-20 mm is formed between central lines X2 of two adjacent splitter boxes 15; the width W of each splitter box 15 is 1.5mm-3mm, and the depth H is 1mm-2mm; the splitter box 15 on each secondary land 14 will communicate with the feed chute 12 and the discharge chute 13 adjacent to that secondary land 14. Each diversion channel 15 enables part of liquid-phase materials in the feeding channel 12 to flow into the corresponding discharging channel 13, so that the auxiliary ribs 14 are guaranteed to have original shearing performance, meanwhile, the flow rate of the liquid-phase materials in the barrier section 1 is improved, and the purpose of improving the yield of the extrusion screw is achieved. The auxiliary edge 14 provided with the splitter box 15 ensures the shearing plasticizing effect, reduces the shearing temperature, prevents the material from being over-heated in the barrier section 1, and the auxiliary edge 14 provided with the splitter box 15 also has the mixing effect, so that the plasticizing effect of the material is improved.

As shown in fig. 1, the front end surface of the barrier segment 1 forms an included angle γ 1 with a plane perpendicular to the axis X1, the rear end surface of the barrier segment 1 forms an included angle γ 2 with the plane perpendicular to the axis X1, the included angle γ 1 is equal to the included angle γ 2, and the included angle γ 1 is 30 ° to 45 °. The inclination angles of the front end and the rear end of the barrier section 1 facilitate a smooth transition of the material between the barrier section 1 and the segment connected to the barrier section 1, reducing pressure fluctuations.

The method comprises the following steps that materials including solid phase and liquid phase flow into a barrier section 1 under positive displacement conveying of a screw, the materials enter a feeding groove 12 with an opening at the front end part, when the screw rotates around an axial lead X1, the materials are violently sheared at the barrier section 1, the liquid phase materials flow into an adjacent discharge groove 13 from a gap between a shunting groove 15 and a secondary edge 14 and a barrier of a machine barrel, and then flow to the next section of a rod body from the rear end part of the discharge groove 13 communicated with the next section; the solid phase material is blocked in the feeding groove 12 by the secondary ribs 14 and the main ribs 11, and is melted under the action of shearing, and the melted liquid phase material flows into the discharging groove 13 from the barrier gaps of the secondary ribs 14 and the diversion grooves 15 and then flows out of the barrier section.

Offer the splitter box 15 on bellied secondary arris 14 between the feed chute 12 of this application and the blown down tank 13, both guaranteed the shearing plastify effect, reduce shear temperature again, the prevention overtemperature, the mixed effect of barrier section 1 of improving has shearing plastify and reposition of redundant personnel concurrently, makes output and plastify quality further improve.

The foregoing shows and describes the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are presented solely for purposes of illustrating the principles of the application, and that various changes and modifications may be made without departing from the spirit and scope of the application, which is defined by the appended claims, the specification, and equivalents thereof.

Claims

1. The utility model provides an extrusion screw, includes the body of rod that extends from preceding back, its characterized in that, the body of rod include barrier section (1), barrier section (1) be close to the rear end portion of the body of rod, barrier section (1) include a plurality of main arriss (11) that extend along axial spiral, adjacent two main arriss (11) between concave be equipped with main arris (11) parallel feed chute (12) and blown down tank (13), feed chute (12) with blown down tank (13) between form with main arris (11) parallel vice arris (14), vice arris (14) on be provided with the intercommunication feed chute (12) with a plurality of splitter box (15) of blown down tank (13), a plurality of splitter box (15) distribute in proper order from preceding back.

2. Extrusion screw according to claim 1, characterised in that the main rib (11) has an angle θ with the axis of the shank, said angle θ being between 30 ° and 45 °.

3. The extrusion screw according to claim 2, wherein each of the splitter boxes (15) has a center line perpendicular to the shaft axis, and the center line of each of the adjacent splitter boxes (15) on each of the ribs (14) is spaced apart by a distance d of 10mm to 20mm.

4. The extrusion screw according to claim 1, characterised in that the dividing channel (15) has a channel depth H of 1mm to 2mm.

5. Extrusion screw according to claim 2, characterised in that the front face of the barrier section (1) has an angle γ with a plane perpendicular to the axial line₁The rear end surface of the barrier section (1) forms an included angle gamma with a plane vertical to the axial lead₂Said angle γ₁And said angle gamma₂Equal, said angle γ₁Is 30-45 degrees.

6. The extrusion screw according to claim 1, wherein the feed channel (12) is open at the front end and closed at the rear end, the feed channel (12) having a rear end with a channel bottom and a channel wall surface forming an angle α of 150 ° to 170 °.

7. The extrusion screw according to claim 6, wherein the discharge chute (13) is closed at its front end, the discharge chute (13) is open at its rear end, and an angle β is formed between the bottom of the discharge chute (13) at its front end and the wall surface of the discharge chute, said angle β being 150 ° to 170 °.