A measuring servo liquid level gauge for oil tanks

Abstract

The invention relates to the technical field of liquid level measurement and discloses a measurement servo liquid level meter for an oil tank, the measurement servo liquid level meter comprises an oiltank and a vertical steel pipe, the vertical steel pipe is vertically and fixedly installed in the oil tank, the oil tank is filled with a large amount of oil, the oil tank is not fully filled with the oil, and the vertical steel pipe is provided with uniformly distributed through holes. A movable floater and a signal receiver are arranged; laser sensors can measure the distance from the surfaceof the oil liquid to a tank top in real time; signals are transmitted to the outside; the laser sensors are used for measuring the length within several meters; the precision can be up to micron, themeasurement precision of the liquid level meter is greatly improved; and two groups of laser sensors are arranged on the movable floater such that two groups of data are measured at the same time andaveraged, the measurement precision of the liquid level meter is further improved, the liquid level fluctuation caused by the in and out of oil in the oil tank is effectively prevented, the signal receiver is driven to shake, and the error of liquid level height measurement is reduced.

Description

technical field [0001] The invention relates to the technical field of liquid level measurement, in particular to a measuring servo liquid level gauge for oil tanks. Background technique [0002] At present, most of the oil tanks and spherical tanks in domestic refineries use the following instrument level gauges: float steel strip level gauge, static pressure / differential pressure level gauge, servo level gauge, radar level gauge, among which servo level gauge It is generally composed of a stepping motor, a magnetic coupling disc, a wheel hub, a steel wire, a float, a force sensor and corresponding electronic circuits. The bottom can move up and down, and the torque generated by the gravity of the float reacts on the force sensor. Since the buoyancy of the float in different density media is different, the reaction force to the force sensor is also different. Therefore, by measuring the size of the reaction force, the position of the float can be determined. It is in the a...

AI Technical Summary

Problems solved by technology

[0003] The servo liquid level gauge relies on the threaded groove on the hub. When the steel wire enters the threaded groove and is positioned by its thread, the moving distance of the float must be exactly the same for each step of the stepping motor, otherwise errors will occur. Therefore, the servo liquid level gauge The machining accuracy of the wheel hub, stepping motor and corresponding transmission mechanism is very high, which makes the processing cost very high. At the same time, the stepper motor moves the float up and down by about 10mm per rotation of the stepping motor. Each rotation is divided into 200 steps, so each step It is equivalent to 0.05mm, which greatly limits the measurement accuracy of the liquid level gauge, and the servo liquid level gauge needs to change the reaction force applied to the float through the force sensor to make the float in the oil liquid It is impossible to detect the online height of both in real time at the same time, and it is impossible to provide timely information about the oil in the tank.

Images