RU176860U1 - Torsion Tester - Google Patents

Abstract

The utility model relates to testing equipment and can be used to study the strength properties of materials and structures with a static application of torque. The installation includes a screw-cutting lathe, the spindle of which is equipped with an active sample capture and connected to a spindle angle sensor. The installation further comprises a second grip, the shaft of which is installed in the pinhole hole of the tailstock of the machine. The second grip is equipped with a lever with a counterbalancing counterweight, which rests with its free end on an electronic dynamometer placed on the machine bed at a distance from the axis of rotation. The apparatus comprises a sample twist angle sensor mounted on its working part, and a twist angle sensor, a spindle angle sensor and an electronic dynamometer are configured to be connected to a measuring and recording system. Effect: expanding the scope of the installation for torsion testing, increasing the reliability of the results, as well as providing the ability to control the loading speed over a wide range. 1 ill.

Description

The utility model relates to testing equipment and can be used to study the strength properties of materials and structures with a static application of torque.

A known installation for testing torsion, consisting of an active grip associated with an adjustable rotation drive and a passive grip coaxially located with an active grip, is additionally equipped with a glass, in the upper part of which there is an active grip, rotatable around the axis, and in the lower part passive capture, while the glass is equipped with a purge system and is rigidly connected to a shaft equipped with a cooling system, and the drive of the active capture is equipped with brake pads. The change in torque on the shaft is fixed by strain gauges glued to the shaft.

(RU 130708, G01N 3/22, published 03/27/2013)

A disadvantage of the known installation is its small versatility, the device does not provide standard torsion tests, testing samples of various lengths, testing machine parts and structures, which limits its scope.

A device for testing torsion samples containing a bed, grips for attaching a sample, a twisting drive associated with one of the grippers associated with another gripper carriage mounted to move along the axis of the grippers and means of measuring rotation angles, and the connection of the carriage with the gripper is made in the form of a bearing, and the means of measuring the angle of rotation of the gripper associated with the carriage is made in the form of two load-bearing beams with load cells installed perpendicular to the axis of the grips in different st Orons from it and two pins mounted on the carriage parallel to the axis of the grippers, interacting when twisting the sample with the corresponding beams.

(SU 951106, G01N 3/22, published 08/15/1982).

The disadvantage of this known device is its small versatility, since a load meter of this type is designed to test samples of a certain (calculated) cross-sectional size. In addition, the use of a load meter in the form of two elastic tensometric beams complicates its design and adjustment and reduces the accuracy of torque measurement. The disadvantage of this device is the lack of a system for recording and processing information obtained during testing of information using a computer.

The closest is a device for measuring torsion strain, comprising two elements of a mechanical transmission, mounted on the sample and installed at a certain distance from each other, which are connected with angle sensors; while the rotation angle sensors are configured to connect their outputs to a displacement measuring unit, the output of which is connected to an input-output adapter coupled to a single-board computer, the output of which is connected to a human-machine interface module that allows the operator to interact with the device; moreover, the device also contains a power supply, the outputs of which are connected to the inputs of the displacement measuring unit, the input-output adapter and a single-board computer.

(RU 162954, G01N 3/22, published 06/10/2016)

When testing the twisting of a sample in the form of a pipe, the known device was implemented using a screw-cutting machine, in the three-jaw chuck of which a sample is installed, two mechanical transmission elements (gears) are mounted on the sample at a distance of 500 mm from each other, and the gears are meshed with gear wheels, on the shafts of which rotation angle sensors are installed, and a brake in the form of a square rod fixed against the bed of a screw-cutting machine is fixed on the free end of the sample. During rotation of the sample, the angles of rotation of the sample are recorded in two sections, which are converted and fixed by a measuring and recording system, including a displacement measuring unit, an input-output adapter, and a personal computer (PC).

The disadvantages of this known device are the complexity of its use for testing samples containing a working part and developed gripping heads, the complexity of installation and configuration, as well as the insufficient accuracy of the mechanical method of transmitting movement from a deformable part to rotation angle sensors. In addition, the use of this device does not provide for the measurement of torque and obtaining the dependence of the twist angle on the magnitude of the torque, which significantly narrows the scope of its application.

The objective of the utility model and its technical result is to expand the scope of the installation for torsion testing, increase the reliability of the results, as well as providing the ability to control the loading speed over a wide range.

The technical result is achieved by the fact that the torsion testing installation includes a screw-cutting lathe, the spindle of which is equipped with an active grip of the sample and connected to the spindle angle sensor, the installation further comprising a second grip, the shaft of which is installed in the pinhole of the tailstock of the machine, the second grip is equipped with a lever with a balancing counterweight, which rests with its free end on an electronic dynamometer placed on the machine bed at a distance from the axis of rotation, The lug contains a twist angle sensor for the working part of the sample, and the twist angle sensor, spindle angle sensor and electronic dynamometer are made with the possibility of connection with a measuring and recording system, and the screw-cutting machine engine is equipped with a frequency rotation controller.

The technical result is also achieved by the fact that the grips are made in the form of a three-jaw cartridge.

The implementation of the installation according to the utility model of its purpose can be illustrated by an example using a figure, where:

1 - sample subjected to torsion;

2 - active capture - three-jaw cartridge;

3 - second capture - three-jaw cartridge;

4 - engine of a screw-cutting lathe;

5 - quill of the tailstock;

6 - lever;

7 - electronic dynamometer;

8 - spindle angle sensor;

9 - measuring and recording system;

10 - frequency regulator of rotation of the engine;

11 - personal electronic computer;

12 - spindle of a screw-cutting lathe.

13 - counterweight

14 - twist angle sensor

Preparation of the installation according to the utility model for operation is as follows.

In the active grip 2, placed on the spindle 12 of the screw-cutting machine, and the second grip 3, the shaft of which is placed in the pinhole 5 of the tailstock of the machine, set the sample 1, subjected to torsion. As captures, three-jaw, as well as four-jaw chucks of a screw-cutting machine can be used. On the working part of the sample 1 subjected to torsion, a twist angle sensor 14 of the working part of the sample is placed, made with the possibility of connection with the measuring and recording system 9. The second gripper 3 is equipped with a lever 6, which rests on its free end on an electronic dynamometer 7 located on the machine bed and made with the possibility of connection with the measuring and recording system 9. To increase the accuracy and reliability of the measurement results, the lever 6 is equipped with a balancing counterweight 13. In this case, the spindle shaft 12, rotate driven by the engine of the screw-cutting machine 4, is connected to the sensor of the angle of rotation 8 of the spindle, made with the possibility of connection with the measuring and recording system 9.

By turning the second capture 3 combine the free end of the lever 6, which is rigidly connected to the second capture 3, with an electronic dynamometer 7.

Using the machine’s gearbox, the required spindle speed is set to 12. To ensure accurate regulation of the loading speed over a wide range, a frequency controller 10 connected to the machine’s engine 4 is used in the installation,

To conduct torsion tests, the machine engine is turned on and the test specimen is loaded with torque at the required loading speed. Data from the angle sensor 8, the electronic dynamometer and the angle sensor 14, located on the working part of the sample, enter the measuring and recording system 9, which processes them and transfers them to a personal computer PC for recording and displaying the deformation curve on the screen sample: the dependence of the angle of rotation of the active capture and / or the angle of twisting of the working part of the sample on the magnitude of the applied torque.

As a test sample, both standard samples of circular cross-section and samples of non-circular cross-section, as well as machine parts and structures, can be used.

The use of a rotation angle sensor of one grip in combination with an electronic dynamometer connected to the second grip, as well as a twisting angle sensor, ensures the achievement of the set technical result: expanding the scope of the installation for torsion testing, increasing the reliability of the results, and also providing the possibility of speed regulation loading within wide limits.

The sensor data of the installation according to the utility model can be used for digital processing of the obtained results using a computer.

Claims (2)

1. Installation for torsion testing, including a screw-cutting lathe, the spindle of which is equipped with an active grip of the sample and connected to a spindle angle sensor, characterized in that the installation further comprises a second grip, the shaft of which is installed in the pinhole of the tailstock of the machine, the second the grip is equipped with a lever with a balancing counterweight, which rests with its free end on an electronic dynamometer located on the machine bed at a distance from the axis of rotation, and the installation contains an angle sensor and twisting the working portion of the sample, wherein the twist angle sensor, the rotation angle of the spindle and an electronic dynamometer adapted to be connected to a measuring and recording system, and the engine screw-cutting machine is provided with a rotation frequency regulator. 2. Installation according to claim 1, characterized in that the grippers are made in the form of a three-jaw cartridge.

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