Method for regulating vacuum degree of stock discharge box

Abstract

The invention discloses a method and a device for regulating the vacuum degree of a stock discharge box. The device comprises a water storage bucket, a pressure regulation cylinder and a pressure regulation pipe; the lower end of the pressure regulation cylinder extends into the water storage bucket; the lower end of the pressure regulation pipe extends into the pressure regulation cylinder from the upper end of the pressure regulation cylinder; and the joint between the pressure regulation pipe and the pressure regulation cylinder is provided with a movable sealing assembly. In the using process of the device and the method, a vacuum region of the stock discharge box is communicated with the pressure regulation cylinder by a pipeline; the depth of the pressure regulation pipe in the pressure regulation cylinder is regulated; when the vacuum degree in the stock discharge box is greater than that required by the stock discharge box, the air can overcome the water pressure to enter the stock discharge box from the pressure regulation pipe through the pipeline; and when no air enters the pressure regulation pipe, a result that the vacuum degree in the stock discharge box is just suitable or insufficient is illustrated and at the time, the pressure and flow of an air-bleed system of the stock discharge box need to be improved until the air enters the stock discharge box from the pressure regulation cylinder. According to the method and the device, the problem of difficulty in accurately regulating the vacuum degree in the stock discharge box is solved; the vacuum degree in the stock discharge box is reasonable and stable; and the requirement of the papermaking speed on the vacuum degree in the stock discharge box is met.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a method and device for adjusting the vacuum degree of a headbox. Background technique [0002] The headbox is a key part of the paper machine, and it is the hub connecting the two parts of "flowing" and "forming". The pulp whose characteristics meet the technological conditions is sent to the forming wire according to the requirements of the forming part of the paper machine, which provides the necessary prerequisite for the good forming of the paper web. Therefore, the headbox must be able to maintain a stable relationship between the slurry speed and the net speed according to the process requirements, and can conveniently control and adjust the speed, jet angle and screen impact of the spray. [0003] For the headbox, the spraying speed of the headbox is determined by the liquid level of the weir tank in the headbox and the pressure of the air cushion in the ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming and deficiency of above-mentioned prior art, provide a kind of headbox vacuum adjustment method and device, solve the problem that the size of the vacuum in the headbox is difficult to adjust accurately, make the vacuum in the headbox The vacuum degree is reasonable and stable, meeting the requirements of papermaking speed on the vacuum degree in the headbox

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