Flour measuring and coutrolling method for electromagnetic valve

Abstract

The invention is a flow measuring and control method for measurable and controllable electromagnetic valves, belonging to the automation technical field. And the invention firstly makes measurable and controllable flow electromagnetic valve, signal processing controller and power switch compose a flow measuring and control system, where the measurable and controllable flow electromagnetic valve transmits pressure difference between upper and lower valve fluids to the pressure input port of a pressure difference sensor so that the fluid pressure difference is converted through the pressure difference sensor into fluid pressure difference electric signal to output to the input end of the signal processing controller, the signal processing controller calculates the current detected flow according to the input fluid pressure difference and the output current of an electrified coil and compares it with the given flow to output control instruction to change the current of the electrified coil so as to control the valve opening and achieve the purpose of flow control. And the invention implements integration of flow measurement and control, and can conveniently control regulating rule of the valve opening by algorithm.

Description

Technical field [0001] The invention relates to a control method in the field of automation technology, in particular to a flow measurement and control method of a measurable and controllable solenoid valve. Background technique [0002] As we all know, solenoid valves play an important role in controlling flow in automated production systems. However, general solenoid valves only play the role of fully opening or fully closing the fluid flow, and do not have the function of continuously changing the valve opening. There is no self-checking function for flow control effect. In order to observe the flow, a special flow detection device must be installed separately, and a regulating valve must be used to make the flow continuously adjustable. [0003] After searching the literature of the prior art, it is found that the Chinese Patent Application No. 02136159.2, entitled "On-line Moisture Measurement and Control Device for Moisture Mixing in Moulding Sand and Its Use Method", intro...

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Problems solved by technology

[0003] After searching the literature of the prior art, it was found that the invention of Chinese patent application number: 02136159.2, named "on-line moisture measurement and control device for molding sand mixing process and its use method", introduces an online moisture measurement and control device for molding sand mixing process and its use method , by inserting the moisture sensor in the molding sand in the sand mixer to detect the moisture in the molding sand mixing process, and send the obtained moisture information to the computer, and the computer receives the above information and compares it with the preset moisture content of the molding sand to calculate the moisture content. For the amount of water to be added, the computer controls the electromagnetic valve and flow meter in the water source pipeline to add an appropriate amount of water to the sand mixer, but the flow detection and control method used in this invention is performed separately by the moisture sensor and the electromagnetic valve. However, the direct measurement of the flow rate cannot be realized, nor can the continuous control of the solenoid valve opening be realized. At the same time, the measurement error is relatively large, and the lag time of the control output is increased.

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