A control loop for variable filling pressure and its control method

Abstract

The invention relates to a control loop capable of changing a filling pressure and a control method thereof. The control loop comprises an air supply, an electromagnetic valve, a pilot overflow valve, a remote pressure regulating valve and a PLC (programmable logic controller), wherein the air supply is connected with the remote pressure regulating valve, and then is connected with a remote control port of the pilot overflow valve through the electromagnetic valve so as to be used for achieving the remote control of the filling pressure; the pilot overflow valve is mounted on a filling loop; an overflow port is connected with a liquid storing tank through a hydraulic pipeline; and the PLC is connected with the electromagnetic valve and can further send an instruction to control the connection, the disconnection and the switching of the electromagnetic valve, so that pressure regulating valves with different pressures are connected with a remote control end of the overflow valve to be used for achieving the automatic switching of a high filling pressure and a low filling pressure.

Description

technical field [0001] The invention relates to a control loop for variable filling pressure and a control method thereof. Background technique [0002] During the production process of automobile assembly, automobiles need to be filled with antifreeze fluid, brake fluid, washer fluid, power steering fluid and other fluids online. The fluid filling process of the filling equipment on the existing automobile assembly line is as follows: First, install the filling nozzle on the corresponding tank mouth of the automobile → the equipment vacuumizes the automobile fluid pipeline system → leak detection (vacuum protection Pressure)→filling→filling and keeping pressure. After a whole set of filling process is completed, the operator takes out the gun head again, and the filling is completed. [0003] At present, the liquid filling method of the filling equipment visible on the market is: the equipment filling pump (gear pump, plunger pump, etc.) extracts the original liquid from ...

AI Technical Summary

Problems solved by technology

This method of liquid filling mainly has the following defects: This pressure control method mainly has the following defects: 1. If the filling pressure is low, the equipment will be filled slowly, which will affect the production cycle; 2. If the filling pressure is high, the pipeline of the automobile system will It is easy to be burst by the liquid pressure; 3, and the accuracy of liquid addition is poor

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