Air cushion pressure regulation device for fluid pulp box and regulation method

Abstract

The invention discloses an air cushion pressure regulation device for a fluid pulp box and a regulation method. The regulation device comprises a pressure regulation barrel, a pressure regulation pipe and a standard ruler, the pressure regulation pipe is arranged on the middle part of the pressure regulation barrel and its lower end extends into the pressure regulation barrel, the upper end of the pressure regulation pipe is communicated with an air cushion chamber of the fluid pulp box, the standard ruler is fixed on the top face of the pressure regulation barrel and is arranged in parallel with the pressure regulation pipe; a supplement water pipe is arranged on the upper side of the pressure regulation barrel, and an overflow pipe is arranged on the side wall of the pressure regulation barrel. The method comprises the steps that the depth of the pressure regulation pipe extending into the water in the pressure regulation barrel is regulated in advance, so that the depth of the pressure regulation pipe extending into the water is the same as the height of a water column corresponding to the air cushion pressure; in the using process of the fluid pulp box, when the air cushion pressure changes, through the regulation of the opening extent of an air venting outlet, the size of the air cushion pressure and the depth of the pressure regulation pipe extending into the water are kept stable. According to the air cushion pressure regulation device and the regulation method, the stability of the air cushion pressure in the air cushion room is effectively maintained, the device is simple in structure, the regulation cost is very low, and the adoption of precision control components and complex control systems is not necessary.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to an air cushion pressure regulating device and method for a headbox. Background technique [0002] The headbox is known as the "heart" of the paper machine. It is one of the key components of the paper machine and the hub connecting the two parts of "flow delivery" and "forming". It is also one of the fastest-growing components on the modern paper machine. [0003] In papermaking, the function of the headbox is to send the pulp that meets the requirements, has been processed by various necessary auxiliary equipment, and has various characteristics that meet the process conditions, to the forming wire according to the requirements of the forming part of the paper machine. Good shaping provides the necessary prerequisites. Therefore, the headbox must be able to maintain a stable relationship between the slurry speed and the net speed according to the process require...

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Problems solved by technology

[0007] There are two problems with this method. One is high cost and needs to be equipped with high-precision sensors, control valves and controllers. The other is that the adjustment accuracy is affected by the measurement accuracy of the sensor and the adjustment accuracy of the control valve. An existing problem will affect the size of the air cushion pressure, thereby affecting the spraying speed of the headbox. Therefore, the stability of the spraying speed of the headbox is difficult to be well controlled

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