Agitating – Rubber or heavy plastic working – With specified feed means
Reexamination Certificate
2000-03-02
2001-10-09
Cooley, Charles E. (Department: 1723)
Agitating
Rubber or heavy plastic working
With specified feed means
C366S085000
Reexamination Certificate
active
06299340
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a feeding apparatus and method for the extruder which is used for processing rubber, plastic and cellulose etc. (including rubber plasticator, briquetting press, etc.), and in particular to a feeding apparatus and method in spiral engagement of extruder.
BACKGROUND OF THE INVENTION
The material was fed by gravity in the early extruders. Due to the backpressure at the outlet, this feeding method often led to material accumulation at the inlet when material was oversupplied and material slippage when material was undersupplied, resulting in low efficiency and low stability of the extruder. Thereafter, a new extruder was proposed which had a lateral pressure roller being provided at the inlet, and material was fed by means of this roller. This feeding method alleviated the problems of the material accumulation and slippage, however, due to the structure of the feeding apparatus, this method led to material leakage and material being forced into the bearings on both ends of the lateral pressure roller and thus failure of the roller. Although the currently used feeding method using a lateral pressure roller can improve the efficiency and stability of the extruder, the feeding apparatus has a high rate of failure, complicated structure and is difficult to manufacture. In order to overcome above drawbacks and improve the existing feeding method, the persons skilled in the art have proposed that the axial channels and spiral channels used in the feeding apparatus of plastic extruder be introduced into cold feed extruder, but no ideal results have been obtained therefrom. As a result, cold feed extruder still uses lateral pressure roller for the feeding of the material.
SUMMARY OF THE INVENTION
The object of the invention is to overcome the drawbacks of the feeding method and apparatus for the conventional extruder, and provide a feeding method and apparatus for extruder which is used for processing of rubber, plastic and cellulose. Based on the conventional feeding apparatus using a lateral pressure roller, the invention aims to design a feeding apparatus in spiral engagement to achieve the feeding method and apparatus in spiral engagement.
In order to achieve above object, there is provided a feeding method for extruder, the feeding apparatus of the extruder comprises: a cylinder having a material outlet and a material inlet formed thereon, the materials entering the feeding apparatus through the inlet; a screw received in the cylinder and extending along the transfer direction of the materials, the screw having helical flights and used to transfer the materials fed through the inlet by rotating along the cylinder, the method including the steps of:
providing at the inlet a feeding roller, which extends along the transfer direction of the materials and has helical flights which can mesh with the helical flights of the screw;
making the helical flights of the feeding roller engage with the helical flights of the screw untightly;
making the feeding roller and the screw rotate in opposite directions when the extruder operates, thereby the materials being forced into the gaps between the two helical flights under the action of the pressure produced by the helical flights on the feeding roller and entering the extruder under the action of helical flights on the screw.
According to another aspect of the invention, there is provided a feeding apparatus for extruder, the feeding apparatus comprises: a cylinder having a material outlet and a material inlet formed thereon, the materials entering the feeding apparatus through the inlet; a screw received in the cylinder and extending along the transfer direction of the materials, the screw having helical flights and used to transfer the materials fed through the inlet by rotating along said cylinder, the feeding apparatus further comprising a feeding roller provided at the inlet, which extends along the transfer direction of the materials and has helical flights, the helical flights on the feeding roller meshing with the helical flights on the screw untightly, and the feeding roller and the screw rotating in opposite direction when the extruder operates in order for the materials to be fed into the feeding apparatus and transferred.
Preferably, the two journals of the feeding roller are supported by two bearings mounted in the base of the feeding apparatus; the power input end of the feeding roller is provided with a power transmission gear; the feeding roller is covered by a closure for sealing the feeding roller; the base, closure and cylinder form a closed space for transferring materials.
Compared with the prior art, the inventive apparatus is easy to manufacture, has high efficiency and good stability, and especially, it can eliminate the drawback of high rate of failure present in the conventional feeding apparatus and method using lateral pressure roller.
REFERENCES:
patent: 1977515 (1934-10-01), Klippel
patent: 2441222 (1948-05-01), Fuller
patent: 2581451 (1952-01-01), Sennet
patent: 2592476 (1952-04-01), Sennet
patent: 2693762 (1954-11-01), Sennet
patent: 3078511 (1963-02-01), Street
patent: 3085288 (1963-04-01), Street
patent: 3203370 (1965-08-01), Haug et al.
patent: 3310837 (1967-03-01), Wittrock
patent: 3744770 (1973-07-01), Ocker et al.
patent: 3749374 (1973-07-01), Buchheit
patent: 3929322 (1975-12-01), Hanslik
patent: 3929323 (1975-12-01), Smith
patent: 4025058 (1977-05-01), Mizuguchi
patent: 4268176 (1981-05-01), Muller
patent: 4723901 (1988-02-01), Sarumaru
patent: 4764020 (1988-08-01), Moriyama
patent: 4773763 (1988-09-01), Weber
patent: 4786180 (1988-11-01), Chszaniecki et al.
patent: 4877390 (1989-10-01), Ocker et al.
patent: 5096302 (1992-03-01), Durina
patent: 5106198 (1992-04-01), Muller
patent: 5156794 (1992-10-01), Nakanishi et al.
patent: 87102395 A (1987-10-01), None
patent: 87102980 A (1987-12-01), None
patent: 1040167 (1990-03-01), None
patent: 0806280 A2 (1997-12-01), None
Rubber Industry Handbook (1992) pp. 210-212.
Rubber Machinery Design (1984) pp. 307-309.
Liu Pengzhen
Liu Yanchang
Lu Baiyuan
Cooley Charles E.
Kilyk & Bowersox P.L.L.C.
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