SU1634990A1 - Strain gauge linear displacement transducer - Google Patents

Abstract

The invention relates to a measurement technique, namely, to means for measuring linear displacements. The purpose of the invention is to improve the measurement accuracy, manufacturability and durability of the converter. The centers of elastic plates 2 parallel to each other and the strain gages 3 are rigidly interconnected by measuring rod 4, and along the edges of the plate are equally attached to the housing 1, each at two points separated from the rod symmetric identical slots 5 3 Il.

Description

(Rig.2

The invention relates to a measurement technique, namely, to means for measuring linear displacements.

The purpose of the invention is to improve the measurement accuracy, manufacturability and durability of the converter.

FIG. 1 and 2 shows a strain gauge transducer for linear displacements, two sections; in fig. 3 - elastic converter plate with an extended range of measured displacements.

The transducer consists of a housing 1 and a pair of elastic plates 2 by resistors 3. The plates 2 are parallel to each other and rigidly connected to each other in the center by a common measuring rod 4, intended for communication with the object of measurement (not shown). Plates 2 are equally attached along the edges of housing 1 each at two points, lying on the same axis of symmetry of the plane of the plate and separated from the stem 4 by symmetric identical slots 5. The resistance strain gages 3 are located in the middle working part of the plate 2, which bends, t . between the slots 5 and symmetrically on both sides of the rod 4, which determines the linearity of the function of converting linear displacements of the rod into an electrical output signal of a strain gauge circuit (not shown). The range of measurable displacements is determined by the deformation capacity of the working part of the plates 2, which can be increased both by simply increasing the size of the slits 5 and by changing the shape of the latter: the deformability of the working part of the plate shown in FIG. 3, higher than that shown in FIG. 2. The converter may be equipped with a spring b supported on the protrusion of the rod 4 and an adjusting screw 7.

The Converter operates as follows.

The housing 1 is fixed in place. Rotation of the adjusting screw 7 presses the free end of the stem 4 protruding from the body 1 to the object of measurement with the force developed by the spring being compressed at the same time 6. The zero reading of the strain gauge circuit is fixed. Subsequent linear displacements of the measurement object cause, respectively, the longitudinal displacements of the rod 2 and the bending of the working part of the plates 2, recorded by the strain gages 3.

In the proposed converter, the outlet of the housing 1 does not

Claims (1)

the function of directing linear displacements of the rod 4, since this function is performed by a pair of parallel sensing elements that are parallel to the distance and rigidly connected to the rod and body of the plates. Due to this, the measurement error due to friction in the sliding guides is excluded. The converter is simple to manufacture, small in size, can be operated for a long time under vacuum conditions and at elevated temperatures (with appropriate performance of strain gages). The invention of the strain gauge transducer linear displacement, consisting of a body, a pair of parallel plates separated from each other and interconnected elastic plates with strain gauges, the centers of which are rigidly connected to the measuring rods, intended for connection with the object of measurement, characterized in that in order to improve measurement accuracy, manufacturability and durability of the converter, the plates are interconnected by measuring rods, integrated into a whole, and are equally attached to a coil sensor body, each at two points lying on the same axis of symmetry plane of the plate and separated from the stem symmetrical identical slots. B // /////// 7/7/7 /////////// -Fig.d 5 5