SU1203167A2 - Arrangement for straightening the web - Google Patents

Description

The invention relates to the pulp and paper industry and is intended for use in the press section of paper and cardboard machines to prevent the formation and melting of folds and moss on the endless felt, acceleration of cloth in width (from the middle to the edges). The device can be used for the same purpose as paper-shafts installed after the drying part and calender, as well as on finishing machines.

The invention may also be used in other industries, for example in the chemical, textile, industry for the same purposes.

The purpose of the invention is to improve the quality of the products produced and the reliability of the device due to the increase. the stiffness of the shaft.

The drawing shows a schematic diagram of a proposed device.

The device contains an accelerating shaft 1. fixed in the end supports 2 and provided with a drive 3 for changing its deflection.

The accelerating shaft 1 is made in the form of a pipe 4 with through screw slots 5 of alternating pitch symmetrical with respect to the middle of the shaft, increasing from the edge to the middle of the shaft.

In the inner cavity of the pipe there are a core 6 with a length from 0.5 to 0.8 of its length, mounting rings 7 and rings of elastic material 8.

The core 6 is mounted in a pipe by means of adjusting rings 7 fixed on its ends and is in contact with

the inner surface of the pipe through the rings 8 of elastic material.

The device works as follows.

By driving the drive 3 to change the deflection of the acceleration shaft when transmitting a bending moment to its edge, its deflection is caused. During the deflection of the accelerating shaft, the elastic rings 8 are deformed (compressed) with. The forces from the compressed rings 8 are transmitted to the core 6, 0 which also bends. Thus, the deflection of the accelerating shaft 1 will be determined not only by its stiffness, but also by the specific stiffness of the elastic rings and the core. By selecting the stiffness of the elastic rings and the core, any stiffness of the acceleration shaft can be ensured.

By varying the stiffness, a change in the natural frequency of the shaft oscillations is achieved, therefore, for each frequency of rotation of the shaft, it is possible to ensure that the frequency Q of the natural oscillations of the shaft does not coincide with the frequency of rotation, and to prevent resonance and vibration.

The elastic rings, when made of rubber, which is a vibration-suppressing material, also reduce EShbration.

Ensuring the need for my rigidity can be achieved by choosing the size of the cores and elastic elements and their number. The maximum deformation during lateral bending of the acceleration shaft takes place in the middle, the deflections near its edges are much smaller, therefore, in order to increase its rigidity, it is advisable to reduce the deflection primarily in the middle. That is why the length of the core is from 0.5 to 0.8 times the length of the pipe of the accelerating shaft.

Claims (1)

DEVICE FOR EDITING CANVAS by ed. St. No. 962393, characterized in that, in order to improve the quality of products and the reliability of the device by increasing the stiffness of the shaft, it has a core length from 0.5 to 0.8 pipe lengths, mounting rings and rings of elastic material, moreover, the core mounted in the pipe by means of mounting rings fixed at its ends, and is in contact with the inner surface of the pipe through rings of elastic material. > the inner surface of the pipe through rings 8 of elastic material. The device operates as follows. By means of the drive 3, the deflection of the accelerating shaft of the bending moment is called its deflection.