SU457764A1 - Wet suction box - Google Patents

Description

one

The invention relates to the mesh part of a paper machine and can be used in the pulp and paper industry.

Wet suction boxes are known, comprising a housing and a lid formed by dewatering sheets.

The purpose of the invention is to intensify the dewatering process. For its implementation, additional strips are installed between the dewatering strips for washing out the mass, the working surfaces of which are beveled at an obtuse angle to the direction of the web movement, and the Additional strips can be mounted with the possibility of reciprocating along the web motion direction using, for example, a screw mechanism.

FIG. 1 - wet box, cross section; in fig. 2 - the same, longitudinal section.

The wet box includes a housing 1 and a composing cover 2. The housing 1 is provided with a support cover 3 with longitudinal slits and jumpers, with the supports 4 located at the ends of the housing. In the lower part of the housing there is a pocket 5 with a hydraulic lock. On the drive side of the machine, the housing is provided with a pipe 6 for connection to a vacuum pump. The cover 2 is made of transverse (relative to the progress of the grid) strips 7 and 8, which are sharp with the grid

and obtuse angles, and longitudinal locking plates 9. The slats 7 and 8 and the plates 9 are attached to the body support cover. The distance between the strips 7 and 8 can, if necessary, be changed, while the strips are moved along the guide grooves of the plates 9 by means of a screw mechanism 10.

During operation of the box in the case 1, a vacuum is created, under the influence of which the web is dewatered on a grid moving along the cover 2 of the box. The magnitude of the vacuum is established by means of valves on the nozzle 6. Water from the mass layer under the influence of vacuum passes through the grid and is discharged through the slots between the strips 7 and 8 into the housing 1, where it is removed from the box through the pocket 5 with a hydraulic lock. The hydraulic lock provides sealing of the housing from the external environment and thus maintains the required vacuum in the housing. During dehydration of the web at the first peaks between the first strips 7 with sharp front edges established by the vacuum in the body along the web, the flow of water filtered through the net gets to the front edges of the dewatering bars and is diverted to the body 1 of the box. In this case, a layer of water hanging under the screen is also scraped off by sharp edges and also directed into the housing. After the dehydration of the web, the compaction at the first shear of the box occurs.

a layer of fibers located on the grid and an increase in the filtration resistance of water from the mass above this layer. In order to prevent this phenomenon, strips 8 are installed on the lid with beveled front edges, which form a reflected flow of water, one part of which blurs the canvas and the other is diverted to the box. The ratio between these flows can be adjusted by changing the distance between the strips 7 and 8 with the help of the screw mechanism 10.

Subject invention

Claims (2)

1. A wet suction box, comprising a housing and a lid formed by dewatering bars, characterized in that, in order to intensify the dewatering process, additional bars for erosion of the mass are installed between the dewatering bars, the working surfaces of which are sloped at a dull angle to the direction of web movement. 2. The box according to claim 1, characterized in that the additional strips are mounted with the possibility of reciprocating movement along the direction of movement of the web using, for example, a screw mechanism. 8 10 L-e.1