CN2320396Y

CN2320396Y - Steady feeding screw extruder

Info

Publication number: CN2320396Y
Application number: CN 98204112
Authority: CN
Inventors: 李泰华; 赵慧民; 李刚
Original assignee: BEIJING RESEARCH CENTRE OF DEGRADATIVE PLASTICS
Current assignee: BEIJING RESEARCH CENTRE OF DEGRADATIVE PLASTICS
Priority date: 1998-04-29
Filing date: 1998-04-29
Publication date: 1999-05-26
Anticipated expiration: 2008-04-29

Abstract

The utility model relates to a steady feeding screw extruder, which comprises a material barrel, a threaded rod, a motor, a speed reducer, a material hopper and a material feeding threaded rod. A stirring paddle is arranged in the material hopper. The material feeding threaded rod is a hollow threaded rod with one head. The phenomena of material bridging and no material feeding can be avoided by the steady feeding screw extruder. The stable material feeding can be achieved and the material feeding efficiency can be enhanced. Thus the utility model is especially suitable for processing the plastic whose cohesive force is larger.

Description

A kind of screw extruder of stable material-supplying

The utility model relates to a kind of screw extruder of stable material-supplying, particularly a kind of screw extruder that is suitable for the big raw material of cohesive force.

Charging aperture under the existing double screw extruder hopper is a long and narrow mouth normally, its width W is similar to double screw extruder feed screw diameter, length is generally 2W or 3W, the raw material that the feed screw top is about to enter in the screw channel forms an arch just, when the raw material that uses in the extrusion was added with the oiliness auxiliary agent, the self-adhesion of compound tendency will increase, when this autohesion arrives to a certain degree greatly, the gravity of raw material with regard to deficiency so that raw material fall, thereby form " bridge formation " phenomenon.

In addition, the feed screw of existing double screw extruder is solid, double thread, pitch is 0.5D (D is a screw diameter), the raw material that cohesive force is big will " wrap up " on the spiral shell rib and screw rod core of feed screw, less pitch makes spiral shell rib and screw rod core become the skeleton of raw material, the gravity of raw material can not or overcome this cohesive force inadequately, causes not feeding or feeding decrease in efficiency phenomenon, in addition occur can not feeding situation.

Take place to build bridge and the feeding ability drop will influence the stability of product quality, even cause product to interrupt, for some sensitiveness raw material such as PVC etc., remaining on the twin-screw raw material can not in time extrude, and also can cause raw material to decompose, and needs shutdown clear up the screw rod head.

The purpose of this utility model provides a kind of screw extruder of stable material-supplying, and this machine can avoid occurring material " bridge formation ", " not feeding " phenomenon, improves feeding efficient.

For achieving the above object, the utility model is taked following design: the screw extruder of this stable material-supplying comprises: barrel, screw rod, motor, decelerator, hopper, feed screw, one paddle is installed in the described hopper, and described feed screw is single head, cored screw.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is material distribution schematic diagram in the existing extruder hopper

Fig. 2 is the side view of Fig. 1

Fig. 3 is the utility model structural representation

Fig. 4 a is the interior paddle schematic diagram of hopper among Fig. 3

Fig. 4 b is the vertical view of Fig. 4 a

Fig. 5 is a feed screw structural representation among Fig. 3

Fig. 6 is Fig. 5 side view

Among Fig. 1, Fig. 2, feed screw 5 is supported on the bearing 1, and 6 for being positioned at the hopper of feed screw top, and hopper 6 is supported on the

hopper seat

4, and 3 be the feeding barrel, and the extruder of existing structure occurs the raw material accumulation easily and overarches 7, is unfavorable for processing.

Among Fig. 3, Fig. 4 a, Fig. 4 b, a paddle is installed in hopper 6, wherein 11 is stirring motor, 12 is bearing block, and the paddle structure is a central shaft, and it upper and lower has two supports, both sides are installed puddler respectively, and axle one end is connected an end and is supported on the bearing block with stirring motor.10 is feeding motor among the figure, and driven by motor feed screw, feed screw of the present utility model are single-head screw and are cored screw that its pitch is diameter D (screw diameter).12 is extruder master motor among the figure, and 13 is the double screw extruder barrel.

Through testing: feeding efficient improves a lot under same rotational speed, still turns round under the economical rationality rotating speed for making motor, should strengthen the gear ratio of the reduction box that connects with feeding motor.

The utility model has the advantages that adopt the change feed screw to be single-head screw, pitch is D (screw diameter), And be cored screw, making on the downward charging aperture direction of screw front end, poly-raw material volume to together is greatly Increase, its weight also increases on year-on-year basis, and under Action of Gravity Field, raw material can fall into twin-screw extrusion at an easy rate In the machine inlet capable, feed screw is through after so changing, and feeding efficient improves a lot under the same rotational speed, adopts Behind paddle, make feeding more stable, avoid solid accumulation.

Claims

1, a kind of screw extruder of stable material-supplying, it comprises: barrel, screw rod, motor, decelerator, hopper, feed screw is characterized in that: a paddle is installed in the described hopper, and described feed screw is single head, cored screw.

2, the screw extruder of stable material-supplying according to claim 1 is characterized in that: the pitch of described single head cored screw is identical with screw diameter.