Automatic timing device and automatic timing capillary viscosity measuring device

Abstract

The invention belongs to the field of measuring and metering science, and relates to an automatic timing device and an automatic timing capillary viscosity measuring device. The automatic timing device comprises a timing device (10), a trigger device (20) and a longitudinal displacement device (30), wherein the timing device (10) comprises a clock (11); the trigger device (20) comprises a first optoelectronic switch (21), a second optoelectronic switch (22), a first switch limiting clamp (23) and a second switch limiting clamp (24); the longitudinal displacement device (30) comprises a first positioning knob (31), a second positioning knob (32) and a connecting rod (33). According to the timing device and the automatic timing capillary viscosity measuring device, which are provided by the invention, infrared rays emitted by the optoelectronic switches are adopted to induce the time that the concave meniscus of a liquid sample flows to an upper timing scale mark and a lower timing scale mark, so that the time of outflow can be automatically measured, the measuring accuracy is high, and the operation is simple and convenient; through the adoption of the longitudinal displacement device, the positions of the upper optoelectronic switch and the lower optoelectronic switch can be freely adjusted, so that the automatic timing device can be suitable for capillary viscometers of different sizes.

Description

technical field [0001] The invention belongs to the field of measurement and metrology science, and more specifically relates to an automatic timing device for viscosity capillary measurement and viscometer calibration and an automatic timing capillary viscosity measurement device including the automatic timing device. Background technique [0002] Viscosity characterizes the state of internal friction of a liquid, and is closely related to the tendency of liquid to move under the action of external force. It is an important physical and chemical parameter and is involved in viscosity measurement in many fields such as military and national defense, petrochemical, medical and health. Viscosity measurement can be divided into capillary method, rotation method, outflow cup method and falling ball method according to different principles. Among them, the measurement uncertainty is the smallest and the most widely used is the capillary method. Without exception, all countries in...

AI Technical Summary

Problems solved by technology

[0003] At present, the timing in the process of capillary viscosity measurement and viscometer calibration is still mostly done manually by the measurement personnel holding an electronic stopwatch, which consumes a lot of energy of relevant practitioners and cannot carry out multiple sets of experiments at the same time, which limits the efficiency improvement.

Observing the meniscus of the liquid through the bath wall with the naked eye for a long time is troublesome and has a great impact on the eyesight of the experimenter, and there are errors in judgment

[0004] The automatic timing device used on the CAV series automatic capillary viscometer produced by American Cannon Company is a thermal switch. The probe is pre-buried on the capillary timing scale line, and the measurement repeatability is good, but the biggest problem of this device is Cannot be promoted, only for Cannon's automatic viscometer, less than 1% coverage

[0005] Another way to achieve automatic timing of viscosity measurement is to install a high-speed camera directly in front of the scale line of the viscometer. When it detects that the meniscus of the sample is tangent to the scale line, the timing is triggered. The disadvantage of this device is that the position of the high-speed camera is relatively Fixed, different sizes of viscometers may cause deviations in measurement results due to the angle of looking up and down

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