JSS30A type digital display convergence counting display convergence meter tunnel convergence meter wholesale price

Model digital display convergence counting display convergence meter tunnel convergence meter tunnel convergence meter wholesale price
1. Overview
Model digital display convergence meter is suitable for measuring tunnels, laneways, cave chambers and other engineering enclosures The distance between two points in any direction around the rock changes slightly to achieve the purpose of assessing the stability of the project, studying the deformation development rules of the surrounding rock and support of the project, and determining reasonable support parameters.
2. [Main technical indicators]
, Measuring range: ~, Numerical display value: ~, Measuring accuracy:, Resolution:, Numerical display value stability: no greater than.
Power supply: R section of silver oxide button battery, overall dimensions: **, weight:
3. [Instrument features]
Novel structure, easy operation, high measurement accuracy, small size, light weight, tight sealing good.
The series convergence meter is the main instrument used to measure and monitor tunnel deformation. It consists of three parts: connection, force measurement and distance measurement.
4. [Convergence meter structure]
. Connection steering: The connection steering is realized by micro bearings, which can realize rotation in any direction of space
. Force measuring spring: used to calibrate the tension of the steel ruler , thereby improving the accuracy of reading
Distance measuring device: Distance measurement is composed of a steel ruler and a micrometer. The steel ruler measures distances greater than the above. There is a positioning hole every other on the steel ruler. The minimum reading of the spiral micrometer is. The reading of the distance measuring steel ruler + the reading of the spiral micrometer. During measurement, when the convergence meter is suspended between two measuring points and the micrometer is screwed in, the tension of the steel ruler increases until it reaches the specified tension, and the reading is taken.
5. [Usage]
Hang the instrument and adjust the tension of the steel ruler
Before measuring, estimate the approximate distance between the two measuring points, and fix the steel ruler to the required length (pull out the steel ruler) Use the ruler to fix the positioning hole in the positioning pin), screw the screw micrometer to the maximum reading position (), hang the two axis holes of the instrument on the previously buried cylindrical measuring points, hold the instrument with one hand and the other hand Screw in the screw micrometer until the scale line on the inner guide rod coincides with the scale line on the sleeve, and the reading can be taken.
, reading
The reading of the steel ruler at the positioning pin is called the first number of the length, and the reading of the spiral micrometer is the last number.
Distance measurement first digit + last digit
Generally, the operation should be repeated three times to read three sets of values, and a weighted average calculation should be performed to determine the measurement value to reduce visual errors during measurement.
Calculation of convergence value and convergence speed
The convergence value is the change in distance between two measuring points within a certain period of time. Suppose the observed value at time is, the observed value at time is, then the convergence value △+
Convergence speed △()△△ Among them: △
, temperature correction calculation
Both mechanical convergence meters have Temperature error, so each measured reading should also be added with a temperature correction value, that is
The length of the steel ruler after the correction of the actual measured value + the reading of the micrometer
That is: [()]
In the formula: is the actual length of the steel ruler after temperature correction
is the length reading of the steel ruler at the time of the first observation
is the linear expansion coefficient of the steel ruler, and takes ℃
as the ambient temperature at the time of the first observation (℃)
is the ambient temperature (℃) at the time of the first observation
6. [Maintenance and repair of the convergence meter]
After each measurement, the micrometer should be rotated back to the zero position
. After checking whether all parts are back in place, put the instrument into the instrument box for safekeeping
. After returning home, wipe off dust and other contaminants on the surface of the instrument, apply engine oil on the surface of the instrument, and place it in the inner guide rod. Add a few drops of engine oil for packaging
After the front end of the steel ruler is broken, you can use a punch to punch a rivet hole in the front end of the steel ruler, re-rivet it at the original rivet position, and you can continue to use it.