JPH08112508A - Production of screen basket and screw press cylinder, screen basket and screw press cylinder - Google Patents

Abstract

PURPOSE: To obtain a screw basket and a screw press cylinder as well as to efficiently produce a metal tube having many small holes used as a screen and the heart of a screw press. CONSTITUTION: Many grooves 2 are cut in a band metal 1 at intervals and the band metal 1 is wound in a tube shape 4 as shown by the figure. The grooves 2 form small holes 3.

Description

Detailed Description of the Invention

[0001]

[Industrial application] In the paper industry, pulp industry, chemical industry, food industry, sludge treatment plant, and other industries, the process of selecting foreign substances contained in liquid, and liquid There is the step of separating the mixture of solids. In carrying out the above steps, there are various machines such as a screen (Fig. 2), a screw press (Fig. 3), etc., and the metal cylinder having many small holes of the present invention is the screen (Fig. 2). , Used as the heart of a screw press (Fig. 3).

2. Description of the Related Art When manufacturing a cylinder having a large number of small holes made of metal used in the above machine, holes are drilled directly on the cylinder or on a flat plate by a drill or the like. When making a hole in a flat plate, it is processed into a cylinder after making the hole.

[0003]

When a metal tube having a large number of small holes used for a screen (FIG. 2) and a screw press (FIG. 3) is manufactured by a conventional method, the smaller the holes are, the smaller the holes are. Since the diameter of the drill will be small and it will break, it is necessary to open the hole over time. For example, 0.5 mm
It would take tremendous time to make one tube if you tried to make a hole in it, making it economically impossible. Further, in the case of another method of making a hole by utilizing heat, for example, in the case of an electron beam or a laser, the inside of the hole is melted by heat and it is impossible to make a stable hole. The above problems can be easily solved by the present invention.

[0004]

[Means for Solving the Problems] A large number of grooves (2) are previously cut in a metal strip (1) at intervals and wound as shown in FIG. 1 to form a tubular shape (4). it can. Further, the portion of the groove (2) becomes the hole (3).

[0005]

Function: The groove (2) is cut on the surface of the metal strip (1). Since this groove (2) becomes a hole (3), the shape or size of the groove (2) is selected as semi-circle, semi-ellipse, triangle, square and other shapes according to the purpose of use. When it is necessary to increase the total area of the holes (3) with respect to the surface area of the tube (4), the grooves (2) are cut on both sides of the strip plate (1). The thickness, width (height) and shape of the metal strip (1) also have a rectangular cross section, a trapezoidal shape, and other shapes depending on the purpose and conditions of use, for example, the pressure difference during operation in the machine. It is selected according to ΔP and the like. The produced tube (4) is finished in a structure in which the strips are partially welded and strengthened by a frame or the like so as not to deform and have sufficient strength.

[0006]

EXAMPLE A cylinder (hole size of 1.0 mm or less) of the present invention was used as a screen basket (9) with a screen (FIG. 2) and used paper was dedusted at a processing concentration of 0.8% to obtain quality. Good product (paper) was made. Screw the cylinder of the present invention (hole size 1.0 mm or less) with a screw press (Fig. 3).
When it was used as a cylinder (13), the pressure inside the screw press could be increased because the small solids would be difficult to flow out because of the small size of the pores, and the dewatering efficiency would rise significantly.

[0007]

According to the present invention, since the metal cylinder (4) having a large number of small holes can be manufactured at low cost, it is economically excellent, and the holes can be made small, which has the following advantages. For example,
When the cylinder (4) of the present invention is used for the screen (FIG. 2) to remove dust from used paper, the paper is of good quality because of its excellent precision. This will increase the use of waste paper, preserve trees and contribute to greening. When the sludge is dehydrated by using the cylinder (4) of the present invention with a screw press (Fig. 3), the efficiency is remarkably increased, so that the amount can be reduced. As a result, pollution can be reduced, and when burning, heavy oil can be saved because the sludge contains less water. Therefore, the effect of the present invention is epoch-making.

[Brief description of drawings]

FIG. 1 is a perspective view showing a manufacturing method of the present invention.

FIG. 2 is a cross-sectional view of a general screen.

FIG. 3 is a cross-sectional view of a general screw press.

[Explanation of symbols]

 1 Metal Strip 2 Groove 3 Hole 4 Cylinder 5 Screen Inlet 6 Screen Outlet 7 Reject Outlet 8 Rotor 9 Screen Basket 10 Screw Press Inlet 11 Screw Press Outlet 12 Filtrate 13 Cylinder 14 Screw Woo 15 Conical Closure

Claims (3)

[Claims] 1. A method for producing a metal cylinder, wherein a plurality of grooves are preliminarily cut on a surface of a metal strip plate at intervals to form a wound cylinder, and the groove portions become holes. 2. A screen basket made of metal and having a large number of small holes made by the method of claim 1. 3. A screw press cylinder of a metal cylinder having a large number of small holes manufactured by the method of claim 1.