RU221277U1 - Topformer for paper making machine - Google Patents

Abstract

The utility model improves the method of paper production.

The technical result of the claimed utility model is the improvement of the paper manufacturing method, which makes it possible to produce heavier grades of paper with a smoother top layer and increased mechanical characteristics, and reduces the fragility of thick paper formats. A topformer for a paper making machine, containing an AC motor controlled by a frequency converter, a drive shaft, a tension shaft, a seamless forming mesh on the topformer, an upper three-chamber suction box with holes in which the chambers of the box are capable of operating in different ranges independently of each other, two lower suction boxes that facilitate the separation of moisture from the paper pulp, to which are connected a vacuum line for removing water from the boxes, a pneumatic mesh straightening shaft, a scraper for cleaning the shaft from fiber, a pneumatic mesh stretcher, a spray for wetting the forming mesh, electromechanical jacks and frame racks that fix all the elements topformer.

Description

The utility model improves the method of paper production.

The technical result of the claimed utility model is the improvement of the paper manufacturing method, which makes it possible to produce heavier grades of paper with a smoother top layer and increased mechanical characteristics, and reduces the fragility of thick paper formats.

Among the existing analogues, we can highlight patent RU 2752200 “Machine and method for producing a web of fibrous material” and patent RU 2667591 “Device and method for controlling the states of at least one belt circulating in a paper-making machine, and a paper-making machine containing the specified device.” A distinctive feature from existing similar devices is that due to the suction of water by the upper three-chamber suction box, small parts of the paper pulp are attracted to the mesh and form the same layer as on the lower mesh. As a result, the top layer becomes smooth and durable, adding mechanical strength to the entire paper web. The advantages of the proposed utility model of the installation in comparison with this device is the production of paper of a certain quality according to mechanical parameters without an additional filling table.

The utility model is clearly illustrated by the following figures:

Fig. 1. Topformer for paper machine in three-chamber model

Fig. 2. Topformer for paper machine in 2D model

The topformer for a paper machine is an eguette-type installation that combines the process of forming a paper web with effective dewatering while maximizing the removal of water from the outer surface. The topformer is controlled using the paper machine control panel.

In this case, the entire installation is driven by an AC motor through a frequency converter. This is necessary to synchronize the speed of the grid table and the topformer.

The inventive topformer (Fig. 1, 2) for a paper-making machine consists of the following elements:

1. AC motor controlled by a frequency converter, which drives the drive shaft.

2. A rubber-coated drive shaft that drives the forming mesh of the topformer.

3. The driven shaft is involved in the movement of the mesh. A mesh is stretched between the drive and driven shafts, which is the forming and main working part of the topformer.

4. The tension shaft tightens the mesh part of the topformer.

5. The forming mesh on the topformer is forming, through which the paper pulp is dehydrated during the process of forming the paper web. Seamless mesh is used.

6. Top three-chamber suction box with holes. A vacuum is maintained in each of the three chambers, and the chambers can operate in different ranges independently of each other. Using a vacuum, the box through the mesh takes away part of the water from the mass flow located between the topformer and the mesh of the paper machine's mesh table, partially lifting the paper fiber and forming an even and uniform layer

7. Two lower suction boxes promote moisture separation and change the concentration of mass in the working area of the topformer. They support the wire part of the paper machine, keeping the gap between the screens of the paper machine and the topformer constant.

8. A vacuum line is connected to the outlets of the suction chambers on the back side of the vacuum boxes - water leaves the boxes through them.

9. All elements of the topformer are fixed to the frame posts.

10. Electromechanical jacks regulate the gap between the paper machine mesh and the topformer mesh.

11. The pneumatic mesh straightening shaft, moving where the pneumatic straightening is located, causes the mesh to move from side to side, holding it in one position.

12. Scraper - a device for cleaning the shaft surface from fiber.

13. Pneumatic mesh tensioner tensions the forming mesh of the topformer.

14. The spray wets the mesh to avoid fiber sticking.

Claims (1)

A topformer for a paper making machine, containing an AC motor controlled by a frequency converter, a drive shaft, a tension shaft, a seamless forming mesh on the topformer, an upper three-chamber suction box with holes, two lower suction boxes that facilitate the separation of moisture from the paper pulp, to which a vacuum line is connected for removing water from the boxes, a pneumatic mesh straightening shaft, a scraper for cleaning the shaft from fiber, a pneumatic mesh stretcher, a spray for wetting the forming mesh, electromechanical jacks and frame stands that fix all the elements of the topformer.