CN210880812U

CN210880812U - 80 conical double-screw extruder

Info

Publication number: CN210880812U
Application number: CN201921668281.2U
Authority: CN
Inventors: 魏锋
Original assignee: Hangzhou Wansu Machinery Technology Co ltd
Current assignee: Hangzhou Wansu Machinery Technology Co ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-06-30
Anticipated expiration: 2029-10-08

Abstract

The utility model relates to an 80-conical double-screw extruder, wherein double screws which are symmetrically arranged are arranged in an extrusion channel, external threads which are mutually symmetrical are arranged on the outer surfaces of the double screws, the external diameters of the external threads of the screws are gradually reduced from a big head end to a small head end, and the diameter of the extruded small head of each screw is 80 mm; the external thread of the screw is sequentially divided into a feeding thread, a plasticizing mixing thread, an extruding thread and a pushing thread from a large head end to a small head end, and the maximum axial length of the plasticizing mixing thread is 200 mm. The outside screw thread of adjusting screw shortens the plastify length, and the axial length of control plastify compounding screw thread is the maximum 200mm to will extrude microcephaly diameter control at 80mm, thereby make PP granule material can carry out direct plastify and extrude, avoid twining jar surface blistering, raise the efficiency simultaneously, reduce the energy consumption.

Description

80 conical double-screw extruder

Technical Field

The utility model relates to an extruder especially relates to an 80 toper double screw extruder.

Background

When manufacturing a winding plastic tank, the common material is PVC, and the adopted molding process is mostly extrusion winding.

PVC adopts and throws the material with the form of powder, but the restriction of PVC self characteristic, and PVC plastic tank receives certain restriction in use, consequently people also adopt PP granule material to throw the material gradually and extrude.

However, the particle diameters of the PVC powder and the PP granules are different, and the plasticizing requirements are different, so that when the PP granules are extruded by an extruder used for extruding the PVC powder to be wound, the surface of a plastic tank is easy to foam, the surface of the plastic tank is unqualified, and the interior of the plastic tank has defects, so that the extruder needs to be improved to adapt to the extruding and plasticizing requirements of the PP granules.

Disclosure of Invention

The utility model provides an 80 toper double screw extruder improves the twin-screw, and the screw thread is extruded on adjusting screw surface, and the diameter of end is extruded to adjusting screw simultaneously to when making the PP material that double screw extruder extruded to carry out the winding of plastic tank, surface foaming can not appear.

The utility model discloses a concrete technical scheme does: an 80-conical double-screw extruder is characterized in that double screws are symmetrically arranged in an extrusion channel, external threads which are mutually symmetrical are arranged on the outer surfaces of the double screws, the external diameters of the external threads of the screws are gradually reduced from a large head end to a small head end, and the diameter of an extruded small head of each screw is 80 mm; the external thread of the screw is sequentially divided into a feeding thread, a plasticizing mixing thread, an extruding thread and a pushing thread from a large head end to a small head end, and the maximum axial length of the plasticizing mixing thread is 200 mm.

The outside screw thread of adjusting screw shortens the plastify length, and the axial length of control plastify compounding screw thread is the maximum 200mm to will extrude microcephaly diameter control at 80mm, thereby make PP granule material can carry out direct plastify and extrude, avoid twining jar surface blistering, raise the efficiency simultaneously, reduce the energy consumption.

Further preferably, the feeding thread is a double-start thread, the extruding thread is a triple-start thread, and the pushing thread is a triple-start thread.

Preferably, the plasticizing and mixing screw thread is divided into three sections, namely a first section, a second section and a third section, wherein the first section is close to the feeding screw thread, the third section is close to the extruding screw thread, and the second section is positioned between the first section and the third section; wherein, the first section is double thread, and the second section is double thread, and the third section is single thread.

Further preferably, in the plasticizing and mixing screw thread, the tooth thickness of the second section of screw thread is the smallest, the tooth thickness of the first section of screw thread is the largest, the screw pitch of the second section of screw thread is the smallest, and the screw pitch of the first section of screw thread is the largest.

More preferably, the second section of the screw thread is provided with 5 backflow grooves which are uniformly distributed along the circumference.

Preferably, the pitch of the extrusion thread of the screw is the largest, and the pitch of the pushing thread gradually increases from the end close to the extrusion thread to the small end, and the largest pitch of the pushing thread is equal to the pitch of the extrusion thread.

Preferably, the axial center of the screw is provided with a cooling water hole, and the cooling water hole is closed at the small end of the screw and opened at the large end of the screw.

The utility model has the advantages that: the outside screw thread of adjusting screw shortens the plastify length, and the axial length of control plastify compounding screw thread is the maximum 200mm to will extrude microcephaly diameter control at 80mm, thereby make PP granule material can carry out direct plastify and extrude, avoid twining jar surface blistering, raise the efficiency simultaneously, reduce the energy consumption.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the present invention taken along line A-A of FIG. 1;

in the figure: 1. feeding screw thread, 2 plasticizing and mixing screw thread, 3 extruding screw thread, 4 pushing screw thread, 5 third section, 6 second section, 7 first section, 8 reflux groove, 9 screw rod, 10 cooling water hole.

Detailed Description

The invention will be further described with reference to specific embodiments and with reference to the accompanying drawings.

Example (b):

as shown in figure 1 and figure 2, in the 80-conical double-screw extruder, double screws which are symmetrically arranged are arranged in an extrusion channel, external threads which are mutually symmetrical are arranged on the outer surfaces of the double screws, the external diameter of the external threads of the screw 9 is gradually reduced from a large head end to a small head end, and the diameter of the small head of the screw is 80 mm. The external thread of the screw is sequentially divided into a feeding thread 1, a plasticizing mixing thread 2, an extruding thread 3 and a pushing thread 4 from a large head end to a small head end, and the maximum axial length of the plasticizing mixing thread is 200 mm. The feeding thread adopts a double-end thread, the extruding thread adopts a triple-end thread, and the pushing thread adopts a triple-end thread.

The plasticizing and mixing screw thread is divided into three sections, namely a first section 7, a second section 6 and a third section 5, wherein the first section is close to the feeding screw thread, the third section is close to the extrusion screw thread, and the second section is arranged between the first section and the third section. The three sections of threads are discontinuous and have a gap on the circumference. Wherein, the first section is double thread, and the second section is double thread, and the third section is single thread. In the plastify compounding screw thread, the tooth thickness of second section screw thread is minimum, and the tooth thickness of first section screw thread is the biggest, and the pitch of second section screw thread is minimum, and the pitch of first section screw thread is the biggest. The second section of screw thread is provided with 5 backflow grooves 8 which are evenly distributed along the circumference. The reflux groove is in an open U shape, and the U-shaped bottom faces the axis of the screw rod. The pitch of the extrusion screw thread is the largest, the pitch of the pushing screw thread is gradually increased from the end close to the extrusion screw thread to the small head end, and the maximum pitch is equal to the pitch of the extrusion screw thread.

The axis of the screw is provided with a cooling water hole 10 which is closed at the small end of the screw and opened at the big end of the screw.

The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent transformation of doing above embodiment the utility model discloses technical scheme's protection scope.

Claims

1. An 80-conical double-screw extruder is characterized in that double screws which are symmetrically arranged are arranged in an extrusion channel, external threads which are mutually symmetrical are arranged on the outer surfaces of the double screws, the external diameters of the external threads of the screws are gradually reduced from a large head end to a small head end, and the diameter of an extrusion small head of each screw is 80 mm; the external thread of the screw is sequentially divided into a feeding thread, a plasticizing mixing thread, an extruding thread and a pushing thread from a large head end to a small head end, and the maximum axial length of the plasticizing mixing thread is 200 mm.

2. The 80-cone twin-screw extruder according to claim 1, wherein the feed screw is a double-start screw, the extrusion screw is a triple-start screw, and the pushing screw is a triple-start screw.

3. The 80-cone twin-screw extruder of claim 1 or 2, characterized in that the plasticised compounding screw is segmented into three sections, a first section, a second section and a third section, respectively, the first section being adjacent to the feeding screw, the third section being adjacent to the extrusion screw, the second section being between the first and third sections; wherein, the first section is double thread, and the second section is double thread, and the third section is single thread.

4. The 80-cone twin screw extruder of claim 3 wherein the plasticized mixing flight has a minimum thickness of the second flight, a maximum thickness of the first flight, a minimum pitch of the second flight, and a maximum pitch of the first flight.

5. The 80-cone twin-screw extruder according to claim 3, wherein the second-stage screw is provided with 5 backflow grooves which are uniformly distributed along the circumference.

6. The 80-cone twin-screw extruder of claim 1, wherein the pitch of the extrusion flights of the screws is at a maximum, and the pitch of the pushing flights increases gradually from near the end of the extrusion flights to a small end and at a maximum equal to the pitch of the extrusion flights.

7. The 80-cone twin-screw extruder according to claim 1, 2 or 6, wherein the axial center portion of the screw is provided with cooling water holes, and the cooling water holes are closed at the small end of the screw and open at the large end of the screw.