SU718517A1 - Paper-making machine wire section - Google Patents

Description

one

The invention relates to the costruction of the grid part of a papermaking machine, namely to its dewatering device.

Lime technical solutions for filing on a paper web on the grid part of the greyush, its environment 1.

The closest in technical sushitnosti is the grid part of the paper machine, containing, and the two grids, the inlet device, the mold shaft, the flat section formed by both grids behind the mold, the shaft and supplied with dewatering equipment w; ika, feed, it to the grids air under pressure, water gathering, iy with supporting strips.

The purpose of the invention is to intensify the dehydration of the paper web on the grid part of the paper machine.

This is achieved by the fact that the suction hose of the compressor is connected by a pipeline, having a water separator, with a water collecting cable.

The drawing shows a schematic diagram of the grid part.

The inner mesh 1 bends around the forming shaft 2, the suction shaft 3 of the built-in press and the mesh rollers 4. Outside

The mesh is supported by a mesh-leading roller 5. The outer mesh 6, the outer surface, lies on the forming shaft 2 and covers the upper shaft 7 of the built-in edge, the mesh-leading rollers 8. In the flat area formed by the grids 1 and 6, between the forming shaft 2 and the suction shaft 3, the top of the air box is located 9 and below the water collecting box 10 with

with support strips. The paper web from the net 1 is absorbed into sukio 11, which encloses the resistive shaft 12. There is an inlet 13 for feeding the pulp.

The box 10 is connected via a pipe 14 with a water separator 15 to the suction pipe of the compressor 16. The pressure pipe of the compressor is connected to the air box 9 by pipe 17, on which the control valve 18 is installed. The grid part works as follows.

The fibrous mass exits the inlet 13 and enters the gap

inner 1 and outer 6 grids. In the gap between the grids, a pressure is created, under the action of which the molding and dehydration of the fibrous mass occurs. Further dewatering of the formed paper web is performed on an inclined flat area of the grids. In this zone, the moving grids rest on the plaques of the water collecting box, between which the water flows. Further, the paper web, having passed between the suction roll 3 and the upper roll 7 of the built-in press, is transferred to the cloth 11 and enters the press section of the maschine.

From the compressor 16 through the pipeline 17 to the air box 9 enters the compressed air heated in the compressor due to the work of compression. From the water collecting box 10, air is sucked off by the same compressor 16. Under the action of the pressure difference above the outer screen 6 and under the inner screen 1, water from the paper web is squeezed into the water collecting box 10 and removed at its bottom. The air-water mixture from the water-collecting shnink enters through the pipe 14 into the water separator 15, in which the air separates, the moisture is removed from the water separator, and the drained air is sucked in by the compressor 16. The pressure drop on the paper web is determined by the degree of pressure increase in the compressor 16 and the hydraulic resistance of the pipeline 17, the air box 9, the gap between the air box and the external grid 6, the grids and the paper web between them, the water collecting box 10, the suction side 1, its pipeline 14 with water separation 15, and may also be changed by means of a control valve 18.

The offered net part has advantages in comparison with the existing ones. Compressor-discharge line energy technology circuit - dewatering device (lift box) - paper web between grids - water collecting box - suction line - compressor allows the choice of the degree of pressure increase in the compressor and changing the flow cross section of the control valve to increase the pressure differential across the paper sheet thickness, intensify by his very

dehydration, or maintain the optimum regulated value of this differential. The heat generated by the compression operation in the compressor is utilized to heat the paper web. With a small relative removal of the dewatering device from the suction roll and high speeds of movement of the paper web, favorable conditions are created.

for the operation of the suction roll, since due to the increased difference between the pressure in the paper web and the vacuum in the suction roll, the suction effect is enhanced. When limiting the degree of dehydration on the grid part of the press section 5, but the proposed design, due to the intensification of the dewatering process, ensures a reduction in the size of the grid part of the paper machine.

The proposed grid part can be applied in the designed two- and multigrid paper machines, as well as during the modernization of the operated

machines.

Claims (2)

Invention Formula The grid part of the paper machine, comprising an inlet, forming shaft, two grids forming a flat area of joint movement, an air box mounted above the grids and connected to the compressor discharge pipe, and water-supporting A box located under the grids, characterized in that, in order to intensify the dewatering process, the suction inlet of the compressor is connected by a pipeline with a water separator to a water collecting valve. Sources of information taken into account by the expertise 1. US Patent N ° 3925906, cl. 34-18, 1974. 2. USSR author's certificate No. 316804, cl. D 21F 1/00, 1969 (prototn).