Drop volume measuring device

Abstract

The invention discloses a drop volume measuring device, particularly to a drop measuring device for automatically measuring liquid volume in petrochemical industry. A drop volume detecting device is mounted at a to-be-detected liquid outlet and includes a funnel, a funnel cover, a photoelectric sensor, a level bubble, a mirror and magnetic steel. The to-be-detected liquid outlet is inserted into the eccentric liquid intake opening of the funnel cover and contacted with the liquid collecting wall of the funnel so as to be fixed. The drop drips out of a dripping outlet and falls for a distance, and then the double-peak pulse width produced by drop is measured by the photoelectric sensor, as a result, the liquid volume is measured according to a certain proportional relation.

Description

technical field [0001] The invention relates to a liquid drop volume measuring device, in particular to a liquid drop measuring device for automatic determination of liquid volume in petrochemical industry. Background technique [0002] At present, the known liquid level detection uses a photoelectric detection device to measure the height of the liquid level in the measuring cylinder, and the output deviation signal drives the stepping motor to drive the rack and pinion up and down, so that the photoelectric detection device can track the liquid level and move up and down. According to the distance between the photoelectric detection device The height of the bottom of the graduated cylinder is indirectly converted to the volume of the liquid in the graduated cylinder. [0003] The above-mentioned known solutions have the following problems: 1. The technology is complicated, many parts are used, the cost is high, the volume is large, and the reliability is low. 2. The liqui...

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Problems solved by technology

[0003] The above-mentioned known solutions have the following problems: 1. The technology is complex, many parts are used, the cost is high, the volume is large, and the reliability is low

5ml liquid volume), the liquid level tracking error is large

3. The rack and pinion gap error cannot be eliminated

4. The quantization error of the stepper motor step cannot be eliminated

5. It is required that the measuring cylinder must ensure consistent diameter and roundness from top to bottom, otherwise the error will increase greatly, which is almost impossible for glass-blown measuring cylinders

6. The processing of high-precision measuring cylinders is complicated, and the price is as high as more than 1,000 yuan. The glass cylinder body is easily broken. Once damaged, it will not only cause economic losses, but also bring the need to re-calibrate the conversion relationship between the height of the photoelectric detection device and the volume of the liquid. Trouble

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