Improvement on hydraulic control of mill roller for quick lifting Henan Hongxing

波多野结衣在线

  • Your current location is: Home page > Industry news >Improvement on hydraulic control of mill roller for quick lifting
Product search:

Improvement on hydraulic control of mill roller for quick lifting

With the development of modern powder industry, the milling enterprises also put forward higher requirements for grinding equipment. Red Star mill manufacturer For the details of the new pulverizer control system, see the following.

In the past, the hydraulic control system of the pulverizer has not been raised rapidly. When there are large particles between the grinding plate and the grinding roller, the pressure of the system rises sharply, which seriously damages the equipment and affects the stability of the system. Therefore, a new hydraulic control system is designed in our factory. The speed sensor is installed on the grinding roller. In case of any emergency, the speed of the grinding roller will decrease immediately, the sensor will send out a signal, the system will respond, and the grinding roller will lift up quickly, which will play a certain role in protecting the equipment. The hydraulic fast lifting process has the advantages of sensitive response and reliable action.

 New mill

1. Principle of hydraulic control system

The hydraulic control system is composed of variable pump, relief valve, one-way valve, pressure relay, electromagnetic directional valve, accumulator and hydraulic cylinder.

The working process is as follows:

(1) When the hydraulic cylinder moves to the working position, the variable displacement pump starts to work, and the right side of the electromagnetic directional valve 9 is energized. The output flow makes the piston move downward to the set working position. At this time, the pressure relay has not reached the set pressure;

(2) When the oil charging stop valve 12 is opened, the variable displacement pump charges oil into the accumulator to make the accumulator reach the pressure value set by the relay;

(3) When the pressure relay reaches the set pressure value, it will send a signal to unload the variable displacement pump. At this time, the right side of the electromagnetic directional valve 10 is energized, and the energy is supplied by the accumulator to maintain the normal operation of the system;

(4) When there are large particles between the grinding plate and the grinding roller, the speed of the grinding roller decreases and the sensor sends out a signal. At this time, the left side of the electromagnetic directional valve 9 is powered on, the pump and the accumulator supply oil to the rod chamber of the hydraulic cylinder at the same time, and the piston drives the grinding roller to lift up quickly, which makes the system work and plays a certain protective role.

2. Simulation of roller rapid lifting process

The fourth-order Runge Kutta method with fixed step size is used to solve the above-mentioned state differential equations by writing simulation program on MATLAB software. The main parameters of the simulation system are: the volume of the accumulator is 0.04m3, the charging pressure of the accumulator is 8Mpa, the charging pressure of the accumulator is 12MPa, the diameter of the hydraulic cylinder is 0.25m, the diameter of the piston is 0.16m, the stroke is 0.6m, the diameter of the hose is 0.01M, the length of the hose is 3M, the input flow is 37l / min, and the simulation time is 0.1s.

It can be seen from the simulation results that the fast lifting process takes a short time, about 0.005s, when the piston lifts 30mm, the accumulator pressure decreases instantaneously and the piston speed reaches. The pressure in the oil discharge chamber increases instantaneously due to the rapid lifting of the piston; after 0.030s, the system tends to normal working state. It can be seen from the simulation results that when there are large particles between the grinding plate and the grinding roller, the system will quickly lift to a certain height, thus playing a certain role in protection. The experiment shows that the system design is feasible.

3. Conclusion

(1) Through the design of the rapid lifting process of grinding roller in hydraulic control system, a simplified model of rapid lifting process of grinding roller is obtained, which lays a foundation for further research of similar systems.

(2) Based on the power bond graph method, the bond graph model of the roller rapid lifting process is established, and the state differential equation of the model is derived. The simulation results show that the power bond graph method is effective for the study of the system.

(3) In order to meet the requirements of the system parameters, the roller must be lifted to a reasonable height.

Copyright (c) 2015-2016 address: No.8 Tanxiang Road, high tech Zone, Zhengzhou City, Henan Province Business license