Constant pressure oil line system and control method in process of graphitizing carbon product

Abstract

The invention discloses a constant pressure oil line system and a constant pressure control method in the process of graphitizing a carbon product. The method comprises the following steps of 1, inputting a load characteristic curve of a hydraulic cylinder into a control system; 2, starting an oil pump, and injecting hydraulic oil into the hydraulic cylinder and an energy accumulator through a three-position reversing valve and a two-position reversing valve respectively; and 3, comparing the load characteristic curve input into the control system and the preset load characteristic curve according to data fed back by a pressure sensor and a displacement sensor, wherein (a) when pressure of a rear cavity of the hydraulic cylinder and displacement of a piston of the hydraulic cylinder are on the load characteristic curve, the control system adjust output pressure of a proportional pressure-reducing valve in advance; (b) when deltaP is smaller than or equal to the adaptive pressure adjusting range of the constant pressure oil line system, the proportional pressure-reducing valve adjusts the output pressure; (c) when deltaP is greater than the adaptive pressure adjusting range of the constant pressure oil line system, the control system controls the output pressure of the proportional pressure-reducing valve; and (d) when the deltaP exceeds the pressure adjustment range of the control system, the control system controls the hydraulic system for emergency stop. By adoption of the constant pressure oil line system and the constant pressure control method, contact pressure output by the hydraulic cylinder can be accurately controlled.

Description

technical field [0001] The invention belongs to the field of hydraulic technology, in particular to a constant pressure oil circuit system and a control method in the graphitization process of carbon products. Background technique [0002] The process of directly connecting carbon products in series to apply a constant contact pressure, pass in a current, and use the heat generated by the product's own resistance to convert electrical energy into heat energy, thereby graphitizing the product, is called series graphitization. Applying mechanical pressure on the product can promote the graphitization of carbon products and increase the degree of graphitization of the product. At the same time, applying pressure is also conducive to the volume shrinkage of the material. Relative sliding with preferred orientation is produced, which promotes the elimination of structural defects such as micropores, and creates favorable conditions for the three-dimensional ordered stacking of ca...

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Problems solved by technology

This solution is simple and reliable, but it generates a lot of heat and the control accuracy is not high enough, so

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