CN210651807U

CN210651807U - Conical double screw rod

Info

Publication number: CN210651807U
Application number: CN201921668335.5U
Authority: CN
Inventors: 何海潮; 姬广林
Original assignee: SUZHOU JWELL PRECISION MACHINERY CO Ltd
Current assignee: SUZHOU JWELL PRECISION MACHINERY CO Ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-06-02
Anticipated expiration: 2029-10-08

Abstract

The utility model discloses a awl twin-screw, including intermeshing and revolve to opposite a pair of toper body of rod, arrange along circumference corresponding on the toper body of rod and extend to the spiral shell arris of head from the afterbody of this toper body of rod, the toper body of rod divide into feed section, precompression section, compression section, the mixed section of melting, homogenization section, exhaust section and extrude the section in proper order from its afterbody to head the feed section on with in the precompression section, the spiral shell arris angle and the intermediate diameter clearance of spiral shell arris all follow correspondingly on the toper body of rod the afterbody to the head direction of the toper body of rod reduces gradually, and the meshing clearance between the tooth root of spiral shell arris reduces gradually on the addendum of spiral shell arris and another toper body of rod on one of them toper body of rod. Thereby reducing the material and leaking and backward flow from between the screw rod, strengthening the positive displacement conveying capacity of screw rod, improving material conveying efficiency, thereby improving feeding efficiency and output.

Description

Conical double screw rod

Technical Field

The utility model relates to a plastics extrude technical field, in particular to a awl twin-screw for plastics extruder.

Background

The traditional conical twin-screw extruder is usually used for extrusion molding of various recycled materials, such as conical twin-screw disclosed in the Chinese patent application with the publication number of CN102490340A, and can be used for extruding plastic products such as granulation and pipe making of fillers such as PE, PP, PVC and the like, plastic wallboards, integrated wall decorations and the like. However, in the conventional conical twin-screw, because the screw ridge angle and the middle diameter clearance of the screw ridges on the feeding section and the pre-compression section are relatively large, and when the two screws are in meshing transmission, the meshing clearance between the tooth crest of the screw ridge of one screw and the tooth root of the other screw is too large, the material is easy to leak and flow back from the two conical rod bodies, the material conveying capacity is low and unstable, and the feeding efficiency is not high; secondly, the screw edge on the conical rod body of the existing conical double screw is usually a continuous screw edge extending in the circumferential direction, so that the mixing and shearing efficiency of materials is not high, the plasticizing and melting efficiency is not ideal, and the micro-foaming effect of plastics is not good; finally, in the homogenizing section, because the pitch diameter gap of the screw edges of the two screws is relatively large, the conveying capacity of the material is poor, the retention time of the material on the section is long, the condition of excessive plasticization is easy to occur, and the extrusion quality of the product is influenced. Therefore, the traditional conical double-screw structure has low feeding efficiency and is unstable; the plasticizing effect is poor, and the micro-foaming effect is not ideal; low product qualification rate and low production efficiency.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a feeding section material transport capacity is better, feed efficiency is higher.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

the utility model provides a awl twin-screw, includes that intermeshing and revolve to opposite a pair of toper body of rod, arrange in corresponding along circumference on the toper body of rod and extend to the spiral shell arris of head from the afterbody of this toper body of rod, the toper body of rod divide into feeding section, precompression section, compression section, melting mixing section, homogenization section, exhaust section and extrusion section from its afterbody to head in proper order the feeding section on with on the precompression section, the spiral shell arris angle and the intermediate diameter clearance of spiral shell are all followed correspondingly on the pair of toper body of rod the afterbody to the head direction of the toper body of rod reduces gradually, and the meshing clearance between the tooth crest of spiral shell on one of them toper body of rod and the tooth root of spiral shell on another toper body of rod reduces gradually.

In the above technical solution, preferably, in the melt-kneading section, the screw flight on the pair of tapered rod bodies has a plurality of grooves arranged along the circumferential direction.

In the above technical solution, preferably, the depth and the width of the slot gradually increase along a direction from the tail portion to the head portion of the corresponding tapered rod body.

In the above technical solution, preferably, the cross-sectional shape of the slot is U-shaped.

In the above technical solution, preferably, in the homogenizing section, a pitch diameter gap between the screw ridges on the pair of tapered rod bodies is gradually reduced along a direction from a tail portion to a head portion of the corresponding tapered rod body.

In the above technical solution, preferably, the screw angle is 3 to 7 °.

In the above technical solution, preferably, the intermediate diameter gap is 1 to 2 mm.

In the above technical solution, preferably, the engagement gap is 1 to 3 mm.

In the foregoing technical solution, preferably, a distance between the groove bottom of the slot and the outer peripheral surface of the corresponding tapered rod body is 3 to 12 mm.

In the above technical solution, preferably, the slotting width is 15-30 mm.

The utility model discloses an on feed section and precompression section, the spiral shell arris angle and the pitch diameter clearance of spiral shell arris all reduce gradually along afterbody to the head direction from this toper body of rod on the toper body of rod, and the meshing clearance between the tooth root of spiral shell arris on the tooth top of spiral shell arris and another toper body of rod reduces gradually on one of them toper body of rod to reduce the material and follow between the screw rod and leak stream and backward flow, strengthen the positive displacement transport capacity of screw rod, improve material conveying efficiency, thereby improve feed efficiency, improve the output.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the angle of the screw edge on one of the tapered rods according to the present invention;

FIG. 3 is a schematic view of the pitch diameter clearance and the meshing clearance between the screw ridges of the two tapered rods of the present invention;

FIG. 4 is a schematic structural view of a melt-kneading section of one of the tapered rods according to the present invention;

3 FIG. 3 5 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 34 3; 3

Wherein, 1, a conical rod body; 11. a feeding section; 12. a pre-compression section; 13. a compression section; 14. a melting and mixing section; 15. a homogenization section; 16. an exhaust section; 17. an extrusion section; 2. a screw edge; 21. and (4) slotting.

Detailed Description

To explain the technical content, structural features, achieved objects and functions of the present invention in detail, the following detailed description is made with reference to the accompanying drawings.

The utility model discloses on the mainly used plastics extruder, it is used for the plastic products such as granulation, tubulation and plastics wallboard, integrated wall decorations of stopping such as PE, PP and PVC of extrusion molding production. Wherein, the PE refers to polyethylene and is thermoplastic resin prepared by polymerizing ethylene; the PP is polypropylene and is a colorless, odorless, nontoxic and semitransparent solid substance; the PVC refers to polyvinyl chloride, and is a polymer formed by polymerizing vinyl chloride monomers under the action of initiators such as peroxides and azo compounds, or under the action of light and heat according to a free radical polymerization reaction mechanism.

As shown in figure 1, the conical double screw of the present invention comprises a pair of conical rod bodies 1 which are engaged with each other and have opposite rotation directions, and a screw rib 2 which is arranged on the corresponding conical rod body 1 along the circumferential direction and extends from the tail part of the conical rod body 1 to the head part, wherein the conical rod body 1 is divided into a feeding section 11, a pre-compression section 12, a compression section 13, a melting and mixing section 14, a homogenizing section 15, an exhaust section 16 and an extrusion section 17 in sequence from the tail part to the head part of the corresponding conical rod body 1 from the tail part to the head part of the conical rod body 1 from the tail part to the pre-compression section 12. in combination with figure 2, the screw rib angle α and the intermediate diameter gap ξ of the screw rib 2 on the pair of conical rod bodies 1 are gradually reduced from the tail part to the head part of the corresponding conical rod body 1, in combination with figure 3, the meshing gap theta between the tooth crest of the screw rib 2 on one conical rod body 1 and the tooth root of the screw rib 2 on the other conical rod body 1 is gradually reduced.

In order to enhance the plasticizing and melting capacity of the material and improve the micro-foaming effect of the plastic, the screw ribs 2 on the pair of conical rod bodies 1 are provided with a plurality of circumferentially arranged slots 21 on the melting and mixing section 14, and the depth and the width of each slot 21 are gradually increased along the direction from the tail part to the head part of the corresponding conical rod body 1. As shown in fig. 4-5, the groove 21 of the screw rib 2 on the tapered rod body 1 is U-shaped, the width of the U-shaped groove is indicated by letter B, the distance between the bottom of the U-shaped groove and the outer circumferential surface of the tapered rod body 1 is indicated by letter H, and the smaller the H, the greater the depth of the U-shaped groove.

In order to enhance the material conveying capacity of the homogenizing section 15 and avoid the situation that the material stays on the homogenizing section for too long time to cause excessive plasticization, the pitch diameter gap of the screw ridges 2 on the pair of conical rod bodies 1 on the homogenizing section 15 is gradually reduced along the direction from the tail part to the head part of the corresponding conical rod body 1.

in this example, the range of the screw angle α is preferably 3 to 7 °, the range of the intermediate diameter clearance ξ is preferably 1 to 2 mm, the range of the meshing clearance θ is preferably 1 to 3 mm, the range of the distance H between the groove bottom of the screw thread groove and the outer surface of the tapered rod body is preferably 3 to 12 mm, and the range of the width B of the groove is preferably 15 to 30 mm.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A conical twin-screw comprising a pair of conical rod bodies (1) which are mutually engaged and have opposite rotation directions, and screw ridges (2) which are arranged on the corresponding conical rod bodies (1) along the circumferential direction and extend from the tail parts to the head parts of the conical rod bodies (1), wherein the conical rod bodies (1) are sequentially divided into a feeding section (11), a pre-compression section (12), a compression section (13), a melting and mixing section (14), a homogenizing section (15), a gas exhaust section (16) and an extrusion section (17) from the tail parts to the head parts, and is characterized in that: on the feeding section (11) and the pre-compression section (12), the thread angle and the pitch diameter clearance of the thread ridges (2) on the pair of conical rod bodies (1) are gradually reduced along the direction from the tail part to the head part of the corresponding conical rod body (1), and the meshing clearance between the tooth crest of the thread ridge (2) on one conical rod body (1) and the tooth root of the thread ridge (2) on the other conical rod body (1) is gradually reduced.

2. The conical twin screw of claim 1, wherein: in the melting and mixing section (14), the spiral rib (2) on the pair of conical rod bodies (1) is provided with a plurality of grooves (21) arranged along the circumferential direction.

3. The conical twin screw of claim 2, wherein: the depth and the width of the slot (21) are gradually increased along the direction from the tail part to the head part of the corresponding conical rod body (1).

4. The conical twin screw of claim 2, wherein: the section of the slot (21) is U-shaped.

5. The conical twin screw of claim 1, wherein: in the homogenizing section (15), the pitch diameter clearance of the screw ridges (2) on the pair of conical rod bodies (1) is gradually reduced along the direction from the tail part to the head part of the corresponding conical rod body (1).

6. The conical twin screw of claim 1, wherein: the angle of the screw edge is 3-7 degrees.

7. The conical twin screw of claim 1, wherein: the medium-diameter clearance is 1-2 mm.

8. The conical twin screw of claim 1, wherein: the meshing gap is 1-3 mm.

9. The conical twin screw of claim 2, wherein: the distance between the groove bottom of the open groove (21) and the outer peripheral surface of the corresponding conical rod body (1) is 3-12 mm.

10. The conical twin screw of claim 2, wherein: the width of the slot (21) is 15-30 mm.