SU1474450A1 - Strain-gauge displacement transducer - Google Patents

Abstract

The invention relates to a measurement technique, namely to means of measuring displacements. The purpose of the invention is to improve accuracy in an extended measurement range by obtaining a piecewise linear conversion function with two sensitivity coefficients. For this, the sensing element is made in the form of a pair of elastic elements - a deformation ring 5 fixed on an undeformable body element 1, and a plate 6 fixed on a rod 2 freely moving inside the deformation ring 5 and resting on the inner surface of the deformation ring 5, and strain gages 7 ÷ 14, pasted symmetrically on the deformation ring and on the plate, are included in the common pavement measuring circuit. 1 il.

Description

15

The drawing shows a transducer, B is selected, the movements of the rod 2 begin to be transmitted and the deformation ring 5, which is drawn out and thereby causes changes in the resistances of the strain gages 11-14. And since plate 6 is deformed together with the deformation ring 5, at this second stage the imbalance of the bridge measuring circuit is already determined by changes in resistance of all strain gages 7-14.

Thus, using the proposed converter, it is possible to measure in a wide range of object movements, governed by the dimensions and elastic properties of the plate 6 and the deformation ring 5, with increased sensitivity in part of the range.

general form.

The converter consists of a rigid non-deformable body element 1, in the guide hole of which the rod 2 is placed with the possibility of reciprocating motion, provided with a stop 3 and on which the compression spring 4 is coaxially mounted, one end of which is rigidly fixed on the support 3, and the other end is fixed on the case element 1. The sensing element of the transducer is made in the form of an elastic deformation ring 5 and an elastic plate 6 with a central hole. The deformation ring 5 is fixed on the housing element 1 and has two through holes, with -1 axis, to the guide hole of the housing element 1 and the central hole of the plate 5 through which

the rod 2 passes. Plate 6, the minimum rigidity of which is less than the rigidity of the deformation ring 5 and in the minimum rigidity plane of which the axis of the rod 2 lies, symmetrically 35 and rigidly fixed to the rod 2 and rests with its edges on the internal surface of the deformation ring 5. Strain gages 7-10 pasted sim20

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Claims (2)

30 claims A strain gauge displacement transducer consisting of a rigid non-deformable housing element with a guide hole in which a rod is placed with the possibility of reciprocating motion, a compression spring coaxially with the rod and one end connected to it. Invention Formula A strain gauge displacement transducer consisting of a rigid non-deformable housing element with a guide hole in which a rod is placed with the possibility of reciprocating motion, a compression spring coaxially with the rod and one end connected to it. metrically on the working surface of the plate- 40 M ° SCHUYu stop, and sensitive ele45 Tina 6 in the plane of its minimum stiffness near the stem 2, and the strain gauges 11-14 are pasted on the deformation ring 5 in the circumferential direction at points lying on the axis of the deformation ring 5 perpendicular to the axis of the rod 2. All strain gauges are included in the overall pavement measuring circuit. The Converter operates as follows. With the free end, the rod 2 is brought into contact with the measurement object and the transducer is fixed, rigidly fixing the position of the body element gs 1, for example, by means of a fixed tripod gripper (not shown). The object moves are transferred to the stock. 2, as a result, begins to szh50 with a glued strain gauge, characterized in that, in order to increase accuracy in an extended measurement range by obtaining a piecewise linear conversion function with two sensitivity coefficients, the compression spring is rigidly connected to the abutment and the second end to the body element, the sensitive element is designed as an elastic deformation ring, fixed on the body element and having two through holes, coaxial with the guide hole of the body element, and an elastic plate with a central hole iem, the minimum stiffness which is less than the stiffness of the deformation of the ring and wherein the minimum stringency plane lies five s 0 with a glued strain gauge, characterized in that, in order to increase accuracy in an extended measurement range by obtaining a piecewise linear conversion function with two sensitivity coefficients, the compression spring is rigidly connected to the abutment and the second end to the body element, the sensitive element is designed as an elastic deformation ring fixed on the body element and having two through holes, coaxial with the guide hole of the body element, and an elastic plate with a central hole iem, the minimum stiffness which is less than the stiffness of the deformation of the ring and wherein the minimum stringency plane lies 314744504 the axis of the rod passing through the hole into the common measuring bridge circuit, these deformation rings, and the flat part of the strain gauges is glued on the symmetin, symmetrically and rigidly fixed-metrically on the plate in its plane on the rod with its edges of minimal stiffness near the rod, on the inner surface of the deformation, and the rest on the deformation ring of the ring, and the transducer in the circumferential direction at the points provided with additional strain gages - lying on the axis of the deformation colters, all strain gauges included, perpendicular to the axis of the rod.