Screen cloth of spiral press master and spiral press master containing same

Abstract

The invention discloses a press master screen cloth, comprising an inlet section screen cloth and an outlet section screen cloth, wherein the plate thickness of the inlet section screen cloth is less than or equal to the pore size of an opening thereon, the outlet section screen cloth is a double-layer structure, and the plate thickness of each layer of screen cloth is less than or equal to the pore size of the opening thereon. The invention also discloses a spiral press master containing the screen cloth of the press master. In the invention, the double-layer structure is adopted at the outlet section of the press master, thereby the strength of the screen cloth is high and the phenomenon that the screen cloth is pressed to be broken is prevented. The plate thicknesses of the inner and outer screen cloths are less than or equal to the pore size, and a punching method can be adopted in processing, thereby the processing efficiency is high and the manufacturing cost is low.

Description

technical field [0001] The invention relates to a screen for a screw press and a screw press including the screen, belonging to the technical field of pulp manufacturing equipment. Background technique [0002] At present, screw presses in the field of pulping and papermaking use variable-diameter and variable-pitch screws combined with external screens for dehydration to increase pulp concentration. The screw press machine is composed of a base, a screw shaft, a screen, a screen frame, an inlet, an outlet and a transmission mechanism. It is continuously dehydrated and sent to the discharge port, and the dehydrated water is discharged through the holes on the screen. The screen structure is 2-3mm thick plate with holes of 2-3mm in diameter. In order to allow the liquid to escape smoothly and reduce the slurry loss caused by the slurry being discharged together with the liquid, the screen requires a small opening diameter and a With a high opening rate, tens of thousands of...

AI Technical Summary

Problems solved by technology

Using the EDM method to process the screen holes, there are disadvantages such as uneven hole distribution, rough holes, difficult to guarantee accuracy, especially low processing efficiency, etc.

[0003] Because the pulp is squeezed, the screen at the outlet of the pulper is subjected to a large radial force. Although the screen is usually supported by the screen frame, due to the small thickness of the screen and insufficient strength, the screen at the outlet of the pulper is often broken. The phenomenon of crushing will affect the normal use of the pulping machine

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