SU175694A1 - REMOVABLE DEFORMATION SENSOR - Google Patents

Description

Known removable instruments for measuring deformations with static short-term and long-term tests have a limited range of measurements, although they have sufficient sensitivity, and with a wide range they do not have sufficient sensitivity and accuracy.

The proposed removable electrostatic sensor measures deformations and displacements with different sensitivity and in different ranges, without interrupting the measurement process.

For this, the sensor is equipped with an additional, higher strain-gauge characteristics, a sensitive element in the form of a clamp with increased rigidity with resistance sensors attached to it and a special adjusting nut to activate an additional sensitive element at any test site.

The drawing shows the design of a removable sensor for measuring strain.

The sensor comprises a housing /, a steel movable rod 2, a coarse bracket 3 and a sensitive bracket 4 with resistance sensors 8 glued onto the latter, a yoke 5 mounted on the movable rod 2, a regulating nut 6, and a rod with thread and plug.

The sensor is mounted on the sample by a non-contact ball, mounted with special clamps on the structure (not shown on the drawing). The thrust balls enter the recesses of the movable rod and the body. When the sensor is installed, the stem moves with the crossmember, bending the coarse brace. In this case, the clip is free to move with the rod 7.

and adjusting nut 6 in the same direction. When the sample is deformed, the spacing between the balls changes, resulting in the brush 2 and the cross bar 5 not moving, bending the coarse bracket 3. The load cells 5 glued to the bracket.

The resistors will apply an electrical signal to the amplifier and then to the oscilloscope. If it is necessary to measure the deformation on a specific area, turn the adjusting nut 6 with full precision and turn on the sensitive bracket 4, which, in parallel with the rough bracket 3, will react to the deformation of the test specimen. Including the second bracket 4, it is possible to measure in a narrower range of deformations. In the measurement process, both sensitive brackets can be used separately or in parallel, and the second bracket 4 can be turned on at any measurement stage. If necessary

the zone has the possibility of not mounting the sensitive bracket 4 without interchanging the removable sensor as a whole. The continuity of measurements in this case is provided by the coarse clamp 3, which remains incorporated into the measuring circuit. The device can be manufactured with replaceable bases.

Subject invention

Removable strain sensor, comprising a housing, a movable rod and a sensitive element in the form of a bracket with glued on it

resistance strain gauges, characterized in that, in order to increase sensitivity and measurement accuracy at any deformation site without interchanging the device and interrupting measurements, the sensor is equipped with an additional, with higher tensometric characteristics, sensitive element in the form of a bracket with increased rigidity glued to it resistance strain gages and a special adjusting nut for switching on an additional sensitive element at any test site.