Device and method for detecting disc wear of paper mill

Abstract

The invention discloses a papermaking disc grinder millstone wear detection device and method which can adapt to a high speed, high temperature and high pressure working environment of a disc grinder. Wear condition of grinding teeth can be effectively detected, and convenience of installation and low cost are realized. The device comprises a wear detecting rod mounted on the grinding teeth of a millstone and a data processing unit connected with the wear detecting rod. A top end of the wear detecting rod is level with tooth faces of the grinding teeth. The wear detecting rod comprises a rod body, a sleeve cylinder, a step central spindle which is plugged into the rod body axially and a sliding rheostat which is arranged on a bottom end of the rod body, wherein the rod body is nested in the sleeve cylinder in an integrated manner, a top end of the step central spindle is level with a top end of the rod body, a bottom end of the step central spindle extends beyond a bottom end of the rod body, a gasket is fixed on the bottom end of the step central spindle, a spring sleeves the step central spindle, two ends of the spring are respectively connected with the gasket and the bottom end of the rod body, the gasket is fixedly connected with a sliding sheet of the sliding rheostat, and the data processing unit is connected with a conductor of the sliding rheostat and is used for obtaining displacement of the sliding sheet according to changing resistor signals. Thus wear extent can be monitored and detected in real time.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a device and method for detecting wear of a papermaking disc refiner. Background technique [0002] In the pulp and paper industry, the high-consistency disc refiner often plays a vital role. The performance of the high-consistency disc refiner directly determines the quality of the pulp, and is the key to directly converting wood chips into fibers in the entire pulping production line. After the equipment, wood chips or preheated wood chips are fed into the disc refiner, under the action of the high-speed rotating grinding disc, the wood chips are divided into filaments and separated into fibers. Due to the strong friction, a large amount of heat energy is generated to soften the lignin. and fiber separation. [0003] In this process, the wear of the grinding disc is inevitable. Excessive wear of the grinding teeth of the grinding disc will reduce the refining e...

AI Technical Summary

Problems solved by technology

[0005] During the operation of the disc grinder, it is difficult to detect the wear amount of the grinding disc. On the one hand, due to the small gap between the moving disc and the fixed disc, and the high temperature and high pressure, the optical method cannot be detected, and the electrical method used for non-contact measurement The eddy current sensor can detect the gap between the grinding discs, but there are teeth and grooves distributed on the surface of the grinding disc. During the rotation of the moving disc, the eddy current signal can only collect the average value, and the eddy current sensor needs special protection, otherwise it will be worn out soon and cause Damaged, very expensive to detect

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