DE6604989U - EXTENSION MEASUREMENT STRIPS - Google Patents

Description

nadmler-LSenz Aktiengesellschaft Da im

Stilt tfart subdivision turkhoiin 1 2. On% 1

O ^ trump

The invention relates to strain gauges with a larger number of equally spaced side by side to form one Dohnungsmoss stripe chain on a carrier strip or tape ■ United measurement grids.

The invention consists in that the measuring grids are arranged at an angle with respect to the carrier strelfen-Mitte.lach.se. Dioser can be of any size, the same or different for all measuring grids. AiLsh one can combine these inclined grids with measuring grids whose measuring wires between the strip center line are perpendicular or parallel. The arrangement of the grids is based on the suspected course of the stresses on the workpiece to be tested.

It is already known, on small plaques or rosettes

a few millimeters in diameter or elongation

individual measuring grids angular, e.g. in V or star shape or J

to be arranged at right angles to each other. However, these allow f

only a purely local measurement of the voltage curve. You I

are not suitable for measuring a voltage gradient along i ι

-Z- DaiiTi

a certain surface line of the workpiece to be tested. It is true that for such a measurement a larger number of the above-mentioned rosettes can also be placed next to each other. However, this is an extremely laborious and imprecise measure, because it is hardly possible to get the small rosettes in gonau equal distances are to be found exactly along the planned test line to fix. Thanks to the innovation, this is possible without difficulty in a few simple steps.

In the drawing, the subject of the innovation is illustrated in two exemplary embodiments and in an application example. Show it:

Fig. 1 is a plan view of a Dohnungsmoßstroifen with a measuring grid chain with measuring wire groups lying at right angles to one another;

Fig. 2 is a plan view of a strain gauge

with a measuring grid chain at an acute angle as well as parallel and perpendicular to the longitudinal center line of the strip lying measuring wire groups, *,

3 shows the stress diagram of a strain gauge according to Fig.1 and

FIG. H shows the section of an eccentric shaft in a side view, with a strain gauge provided at the transition from the shaft to the eccentric.

Fig. 1 shows a strain gauge 1 with, for example, seven arranged at the same distance and flush side by side

66 ^ 4989

- 3 - Oa. ± m687h / h

neton measuring grids 2,3, whose measuring wire groups alternate are right to each other. The wire groups exist in itself from a zig-zag-like laid piece of wire, both ends of which have small tabs 4 with individual connection lamellas 5.6 on both sides of the carrier strip 1 are connected. The current-carrying parts consist of materials known for such purposes, such as constantan and nickel chromium or the like. The carrier strip 1 consists in particular of Fiberglass. If necessary, the connection lamellas or 6 can also be used through a continuous common connection strip substitute. The carrier strip 1 can also be provided with an edge marking on one or both sides a length measure or the like. Mistake. The arrangement of longitudinal marking strips is also possible. The length of the measuring strip and the number of those applied to it Measurement grid is arbitrary within the scope of the invention. The strip can be marketed as a roll. Likewise is the width of the strips and the dimensioning of its metallic supports or inserts as desired.

The majority of the measuring grid wire groups 3 ^a on the strip 1 a of FIG. 2 lie at an angle of, for example, 15 longitudinal center line of the strip. Only the wire groups 2a of the end grids are, for example, parallel thereto.

Since the voltage maxima in the case of voltage gradients lie in the middle of the measuring chain and the ends of the measuring chain only measure the voltage run-off, as for example the diagram according to FIG. 3 shows, the strip according to FIG. 1 is preferably used. In this, the markings on the base line correspond to the number of measuring points

DaIm

len, the voltage curve a increases the voltages in the grids 2, and the voltage curve b increases the voltages in the grids 3 lying at right angles to them, for example a measuring strip 1 which, according to Pig. k ζ.-B-. on an eccentric shaft 7 »namely at the transition curve of shaft 7 and eccentric is ο

66t)

Claims (1)

- 5 - Daim Claims : 1. Strain gauges with a larger number of in equal distances next to each other to form a strain gauge chain on a carrier strip or tape combined measuring grids, characterized in that the Measuring grid (2,3a) opposite the longitudinal center line of the carrier strip are arranged at an angle. 2. Strain gauge according to claim 1, characterized in that that all measuring grids are inclined at the same angle to the longitudinal center line of the carrier strip. 3 strain gauges according to claim 1, characterized in that that the measuring grids are inclined at different angles to the longitudinal line of the carrier strip. 4. Strain gauges according to claims 1 to 3, characterized in that the carrier strip (1) in addition to the angularly arranged measuring grids (3j3 ^a ) is also provided with those (2,2a) whose measuring wires are perpendicular or parallel to the longitudinal center line of the strip. 5 · Strain gauges according to claims 1 to 4, thereby characterized in that the measuring grid (2,2a, 3, Ta) of the measuring chain on both sides with a single solder connection joint] 1p (5,6) are provided. " 1 -G- Daim \ 6. Strain gauges according to claims 1 to 5 »thereby ': characterized in that the measuring grid (2.2a, 3.3a) on a ξ side of the electrode to a common through • outgoing solder connection strips are connected. 7. strain gauges according to claims 1 and 3 to 6, characterized by a measuring grid combination in which alternately a measuring grid (2), parallel to the carrier ^! striped longitudinal center line and vertical, arranged in addition net is.