SU678357A1 - Apparatus for testing devices for monitoring tensile stress of reinforcement - Google Patents

Description

one

The invention relates to a force-measuring technique and can be used for testing devices for monitoring the tension force of an armature, as well as for testing force-measuring devices for other purposes.

Apparatus for testing devices for controlling the tension force of armature are known, which include a mechanism for coupling with an instrument with the device, a loading mechanism for the device under test, and a measuring device made in the form of a DS DC-01 model dynamometer with a dial indicator. A disadvantage of the known devices is the low sensitivity and accuracy testing, as well as a limited range of conceptual 4JJ effort.

The aim of the invention is to increase the sensitivity and accuracy of tests and to expand the range of controlled efforts. Specified: The goal is achieved by the fact that in the described device the measuring device is made in the form of a fallen cylindrical elastic element and an elastic frame with TB resistors placed inside the cylindrical elastic element and connected from one side to

the articulation mechanism with the test device and, on the other hand, with the loading mechanism, and the loading mechanism is equipped with a reverser, while the cylindrical elastic element is installed inside the reverser connected with one of its branches with the loading mechanism 1a

Fig; 1 shows the described

The device in FIG. 2 is a node T; FIG. 3 is a section along A-A in FIG. 1,

It consists of frame 1, the mechanism of articulation with the test device,

measuring device and loading mechanism. The mechanism of articulation with the device under test contains the axis 2 and loop 3, the measuring device contains a sensitive element and a secondary device. The sensing element contains a frame with plates 4, on which are applied resistance strain gages 5 and b, included in the two opposite arms of the balanced bridge,

cylinder 7 with. cuts, on the outside of which are glued resistance strain gauges 8 and 9 included in the remaining two opposite arms of the equilibrium custa, reverser, state,

Claims (1)

of two branches 10 and 11, size 3. 6 whelping on a common axis. The secondary device contains a circuit 12 included in the circuits of a balanced bridge, an indicator 13 and a box 14c with transistors and a power supply unit. The loading mechanism contains a screw 15, a nut 16,. Retainers 17, ball bearings 18 and a flywheel 19. The individual elements of the device are interconnected as follows: the lower end of the axis 2 is fastened to the upper bar of the branch 10 of the reverser and to the upper part of the frame with plates 4 on which the strain gauges 5 and 6 are pasted. The lower part of the frame with the plates 4 together with the lower bar of the branch 11 of the reverser is attached to the screw 15. The upper bar of the branch 11 of the reverser rests against the upper base of the cylinder 7 with the notches and glued strain gauges 8 and 9. The lower base The cylinder 7 rests on the lower bar of the branch 10 of the reverser, the screw 15 is coupled with the nut 16, which is placed on the flywheel axis and installed together with the ball bearings 18 mounted on it on the frame 1. The retainers 17 are mounted on the frame and attached to it Mon restrict movement nuts 16 vertically. A secondary device with a reohord 12, indications 13, h with the transistor and power supply unit 14 is placed at a distance of 5 6 from the strain gages, the bee is connected to the lower wires. In preparation for work, set the test set to frame 1, Turning the handwheel 19 counterclockwise, provide translational movement of the screw 15. Together with the zingsm, the sensitive element of the measuring device moves upwards, as well as the axis 2 with the loop 3, devices provide their grip. To test the crankshaft by turning the handwheel 19 clockwise, move the screw 15 downwards, which will give the lower bar of the branch 11 of the reverser, the frame with the plates 4 and pasted 1 "w of the tensor resistor 5 and 6. cylinder 7 with strain gauges 8 and 9, and the strip with plates 4 and strain gauges 5 and 6 is stretched. Thus, two strain gauges 5 and 6, placed in the opposite shoulders of the bridge, work from stretching, and two strain gauges B and 9, placed in the remaining opposite shoulders of the bridge, work in compression. The loading force of the tested device is determined by the value of the introduced resistance of the reichord 12, necessary to compensate for the unbalance of the bridge formed during loading and taken into account by the indicator 13. The determination of the calibration characteristics is reduced to a comparison of the testimony of the device under test with the readings recorded by the rheochord at various stages of loading. The minimum reading recorded by the test surfactant determines its threshold of sensitivity. Apparatus of the invention for testing devices for monitoring the tension force of an armature, comprising a mechanism for coupling with a test device, a loading mechanism for a device under test and a measuring device, characterized in that, in order to increase the sensitivity and accuracy of testing and expand the range of controlled forces made in the form of a hollow cylindrical elastic element and an elastic frame with strain gauges placed inside the cylindrical elastic element and connected on one side with a The mechanism of articulation with the device under test, and on the other hand, with the loading mechanism, and the loading mechanism is equipped with a reverser, while the cylindrical elastic element is installed inside the reverser connected with one branch with the loading mechanism I with another - with the articulation mechanism. Phi1 Z