CN216100334U

CN216100334U - Special conical double screw for PVC foaming plate for extruder

Info

Publication number: CN216100334U
Application number: CN202122638355.1U
Authority: CN
Inventors: 王海龙
Original assignee: Zhoushan Yuxin Machinery Co ltd
Current assignee: Zhoushan Yuxin Machinery Co ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2022-03-22
Anticipated expiration: 2031-11-01

Abstract

The utility model provides a conical double screw special for a PVC foaming plate for an extruder, and solves the problem that a melt and a foaming agent cannot be efficiently mixed by the traditional conical double screw. The method is characterized in that: the mixing section is provided with a mixing head, the mixing head is provided with at least two groups of convex teeth, a space is arranged between every two adjacent groups of convex teeth, and the space is in a wave-fold shape. The melt and the foaming agent are shunted by the convex teeth at the mixing head, then the mixture is mixed by the distance between the front convex teeth and the rear convex teeth, the mixture is shunted again, the wave-shaped distance enables the mixing effect to be better, and the quality of the extruded product is ensured.

Description

Special conical double screw for PVC foaming plate for extruder

Technical Field

The utility model relates to the technical field of extruders, in particular to a conical double screw special for a PVC (polyvinyl chloride) foaming plate for an extruder.

Background

The PVC foaming board has the advantages of water resistance, flame retardance, acid and alkali resistance, moth prevention, light weight, heat preservation, sound insulation, shock absorption and the like, and is simple in preparation process, rich in raw materials, low in price and widely applied to various industries.

The PVC foaming plate is formed by extrusion through an extrusion device, a screw is one of core parts of the extrusion device, and the foaming screw mainly has the function of converting PVC powder into a plastic melt with stable and uniform PVC and uniformly dispersed foaming agent through the steps of conveying, compressing, compacting, plasticizing, exhausting, homogenizing, metering and the like, and outputting the plastic melt to a die head foaming and auxiliary device to produce a foaming product meeting the requirements. The traditional conical twin-screw is simple in structure, and the melt and the foaming agent cannot be efficiently mixed, so that the quality and the service performance of the product are influenced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the background art, the utility model provides the conical double-screw special for the PVC foaming plate for the extruder, and solves the problem that the traditional conical double-screw cannot efficiently mix the melt and the foaming agent.

The technical scheme adopted by the utility model is as follows:

the special awl twin-screw of PVC foaming board for the extruder, including the body of rod, be equipped with feeding section, compression section, measurement section, exhaust section and mixing section on the body of rod in proper order, mixing section is equipped with the mixing head, the mixing head is equipped with at least two sets of dogtooths, is equipped with the interval between adjacent two sets of dogtooths, the interval is the wave and rolls over the shape.

The front end and the rear end of each convex tooth are in an isosceles triangle shape.

And a backflow groove is formed in the top of the screw ridge on the compression section.

The compression section is provided with a stirring column arranged on the circumferential rod body.

The stirring columns are at least two rows, and the front and the back adjacent stirring columns are arranged in a staggered manner.

And the top surfaces of the spiral edges on the compression section, the metering section, the exhaust section and the mixing section are provided with wear-resistant alloy layers.

And a cooling channel is arranged in the rod body along the axial direction.

The utility model has the beneficial effects that:

the melt and the foaming agent are shunted by the convex teeth at the mixing head, then the mixture is mixed by the distance between the front convex teeth and the rear convex teeth, the mixture is shunted again, the wave-shaped distance enables the mixing effect to be better, and the quality of the extruded product is ensured.

Drawings

FIG. 1 is a schematic of the present invention.

Fig. 2 is an expanded schematic view of the mixing head of the present invention.

Fig. 3 is a schematic cross-sectional view at a in fig. 1 of the present invention.

FIG. 4 is a cross-sectional view of the rod of the present invention.

The device comprises a rod body 1, a feeding section 2, a compression section 3, a metering section 4, an exhaust section 5, a mixing section 6, a mixing head 7, convex teeth 8, a gap 9, a reflux groove 10, a stirring column 11, a wear-resistant alloy layer 12 and a cooling channel 13.

Detailed Description

The utility model will be further illustrated with reference to the following examples and drawings:

in the embodiment, as shown in fig. 1 and 2, the conical twin-screw special for the PVC foam board for the extruder comprises a rod body 1, wherein a feeding section 2, a compression section 3, a metering section 4, an exhaust section 5 and a mixing section 6 are sequentially arranged on the rod body 1, the mixing section 6 is provided with a mixing head 7, the mixing head 7 is provided with at least two groups of convex teeth 8, a space 9 is arranged between two adjacent groups of convex teeth 8, and the space 9 is in a wave-fold shape. The melt and the foaming agent are shunted by the convex teeth at the mixing head 7, then enter into the space 9 between the front convex teeth and the rear convex teeth to be mixed, and are shunted again after being mixed, the space 9 of the wave-shaped shape enables the mixing effect to be better, and the quality of the extruded product is ensured.

In an embodiment, as shown in fig. 2, the front and rear ends of the teeth 8 are isosceles triangles. Play the effect of direction and reduce the fuse-element resistance, make the compounding enter into the clearance of adjacent dogtooth 8 along 8 inclined planes of dogtooth, can not pile up at 8 front ends of dogtooth.

In the embodiment, as shown in fig. 1 and 3, the top of the screw ridge on the compression section 3 is provided with a backflow groove 10. Two reflux grooves 10 of the left screw and the right screw are staggered with each other, materials can be melted again after being melted in the compression section 3, the materials are completely melted, and the melting efficiency of the materials is improved.

In an embodiment, as shown in fig. 1, the compression section 3 is provided with mixing struts 11 arranged on the circumferential rod body 1. The stirring column 11 is arranged at the front end of the reflux tank 10, and the stirring column 11 stirs materials after various materials are melted, so that the melting materials are uniformly mixed.

In the embodiment, as shown in fig. 1, the stirring pillars 11 are at least two rows, and the stirring pillars 11 adjacent to each other in front and back are arranged in a staggered manner. The stirring column 62 is used for fully stirring the mixed materials, so that the mixed materials are good in effect.

In the embodiment, as shown in fig. 1 and 3, the top surfaces of the spiral ridges on the compression section 3, the metering section 4, the exhaust section 5 and the mixing section 6 are all provided with the wear-resistant alloy layer 12. The wear-resistant alloy layer 12 is a nickel-chromium alloy layer or a high manganese steel alloy layer or a chromium carbide alloy layer, so that the wear of the screw edge is reduced, and the service life of the screw is prolonged.

In an embodiment, as shown in fig. 4, a cooling channel 13 is axially disposed in the rod body 1. Can let in cooling water and circulation simultaneously in barrel and the 1 inside of the body of rod, guarantee that the temperature between screw rod outer wall and the barrel inner wall is all even, the phenomenon that different positions temperature is different can not appear in the fuse-element, guarantees product quality.

It should be understood that the above-described embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. There is no need or no way to give poor examples of all embodiments. And such obvious changes and modifications which are within the spirit of the utility model are deemed to be covered by the present invention.

Claims

1. Special awl twin-screw of PVC foaming board for extruder, including the body of rod (1), be equipped with feeding section (2), compression section (3), measurement section (4), exhaust section (5) and mixing section (6) on the body of rod (1) in proper order, its characterized in that: the mixing section (6) is provided with a mixing head (7), the mixing head (7) is provided with at least two groups of convex teeth (8), a space (9) is arranged between every two adjacent groups of convex teeth (8), and the space (9) is in a wave-fold shape.

2. The conical twin-screw special for the PVC foaming plate for the extruder as claimed in claim 1, is characterized in that: the front end and the rear end of the convex teeth (8) are in an isosceles triangle shape.

3. The conical twin-screw special for the PVC foaming plate for the extruder as claimed in claim 1, is characterized in that: and a backflow groove (10) is arranged at the top of the screw ridge on the compression section (3).

4. The conical twin-screw special for the PVC foaming plate for the extruder as claimed in claim 1, is characterized in that: the compression section (3) is provided with a stirring column (11) arranged on the circumferential rod body (1).

5. The conical twin-screw special for the PVC foaming board for the extruder as claimed in claim 4, characterized in that: the stirring columns (11) are at least two rows, and the front and the rear adjacent stirring columns (11) are arranged in a staggered manner.

6. The conical twin-screw special for the PVC foaming plate for the extruder as claimed in claim 1, is characterized in that: and the top surfaces of the spiral edges on the compression section (3), the metering section (4), the exhaust section (5) and the mixing section (6) are provided with wear-resistant alloy layers (12).

7. The conical twin-screw special for the PVC foaming plate for the extruder as claimed in claim 1, is characterized in that: and a cooling channel (13) is arranged in the rod body (1) along the axial direction.