Disc refiner constant pressure pulping method and device

Abstract

The invention provides a disc refiner constant pressure beating method, specifically, during the beating process, the pressure in the grinding zone is kept constant according to the set value, and the beating intensity is controlled by the pressure in the grinding zone; the pressure in the grinding zone is kept constant according to the set value The constant is achieved by changing the gap between the grinding discs in the grinding area according to the pressure change. The minimum value of the gap between the grinding discs is preset and remains unchanged during the working process. The gap between the grinding discs The gap change is realized through the control and adjustment of the hydraulic system; a constant pressure beating device of a disc refiner, including a moving disc, a static disc, a main shaft, including a hydraulic cylinder, a piston, a thrust cylinder, a pressure control component, a minimum gap control component for grinding discs, and a piston installed In the hydraulic cylinder and positioned and socketed outside the thrust cylinder, the thrust cylinder is positioned and socketed outside the main shaft and connected with the pressure control component, and the grinding disc minimum gap control component is socketed with the thrust cylinder. The invention can keep the grinding zone pressure constant during the beating process of medium and high consistency, and ensure the high quality and stability of beating.

Description

technical field [0001] The invention relates to disc refiner beating technology, in particular to a disc refiner constant pressure beating method and a device thereof. Background technique [0002] For the paper industry, medium and high-consistency beating technology is more and more widely used. During medium and high-consistency beating, due to the high concentration of pulp, the fiber is no longer in the grinding area of ​​the disc refiner like low-consistency beating. The beating effect is caused by the direct mechanical action on the fiber, but the beating effect on the fiber itself is caused by the friction between the fibers, such as dissolving, splitting, brooming and fibrillation, and the direct effect of the grinding disc on the fiber is secondary. s position. In the existing beating technology, the strength and quality of the beating action are mainly adjusted by adjusting the distance between the grinding discs. The gap between the mov...

AI Technical Summary

Problems solved by technology

In the existing beating technology, the strength and quality of the beating action are mainly adjusted by adjusting the distance between the grinding discs. The gap between the moving plate and the fixed plate is set in advance before the disc refiner works, and is mechanically adjusted. or hydraulic methods to ensure that the disc refiner remains at this set value during work. This fixed-distance beating method continues from low-consistency beating to medium- and high-consistency beating, without considering the medium- and high-consistency beating. Compared with the low-consistency beating, the beating mechanism has undergone fundamental changes. Since the medium- and high-consistency beating is not mainly based on the direct mechanical action of the grinding discs on the fibers, when the pressure in the grinding area changes, due to the friction between the grinding discs The gap is not allowed to change, and the working pressure in the grinding area will inevitably rise. When factors such as the feeding amount of the disc refiner change, the working pressure in the grinding area will also change. Friction is the main factor, and the pressure change in the grinding area directly affects the beating quality and quality stability of the disc refiner. Therefore, this method of adjusting the grinding area at a fixed distance is the most important parameter for the stability of the medium and high-consistency beating quality and as a quality control parameter. Unfavorable; to solve this problem, it is very important for medium and high consistency beating

Images