RU185825U1 - Device for measuring wear of samples on a friction machine - Google Patents

Abstract

The utility model relates to the field of materials testing for wear and can be used to measure the total linear wear of structural materials. The device comprises a block, a roller, a drive shaft, a loading device, a linear wear sensor. The linear wear sensor is an elastic plate on which two strain resistances are fixed, one on the upper and lower plane of the plate, electrically connected to each other by a bridge circuit, and is configured to connect to a circuit for measuring electrical resistance and processing information, the elastic plate being one the end is rigidly fixed to the friction machine, and the second rests on the upper surface of the pads. Effect: reduce the time required for measuring wear of the test sample, as well as providing the ability to take into account the change in linear dimensions due to temperature. 3 ill.

Description

The utility model relates to the field of materials testing for wear and can be used to measure the total linear wear of structural materials.

A device is known for measuring wear of samples on a friction machine, described in a method for measuring wear of samples on a friction machine and containing test samples, a block, a roller, a drive shaft, a loading device, a linear wear sensor, a recording device and a bath with oil for lubricating the samples (see RF patent No. 2141107, G01N 3/56.

The disadvantage of this device is to determine the total linear wear only within one test, after which the sample must be removed and weighed, thereby it is necessary to produce a tribotechnical pair again. Also, this device does not allow to take into account the change in linear dimensions due to temperature.

The technical task of the utility model is to reduce the time required for measuring wear of the test sample, as well as to provide the ability to take into account the change in linear dimensions due to temperature.

The problem is solved in that in the known device for measuring the total linear wear on a friction machine containing a block, a roller, a drive shaft, a loading device, a linear wear sensor, according to the change, the linear wear sensor is an elastic plate on which two strain resistances are fixed, one on the upper and lower plane of the plate, electrically connected to each other by a bridge circuit, and is configured to connect to a circuit for measuring electrical resistance and processing and information, wherein the elastic plate with one end rigidly secured to friction machine, and the second is supported on the upper surface pads.

The essence of the utility model is illustrated by drawings, where:

- in FIG. 1 schematically shows the inventive device;

- in FIG. 2 schematically depicts an electrical diagram of the connection of strain resistances to each other;

- in FIG. 3 schematically shows the calibration of strain resistance.

A device for measuring the wear of samples on a friction machine contains a block 1 for attaching the test sample (not shown in Fig.), A roller 2 (Fig. 1), a linear wear sensor, which is a strain gauge 3 (Fig. 1, 3) in the form of an elastic plates made of spring steel, for example, grade 40KHNM (GOST 10994-74) with a high modulus of elasticity (E = 200000 MPa). The elastic plate 3 at one end is rigidly fixed to the friction machine, and the second rests on the upper surface of the block 1, to the lower surface of which the test sample is attached. On the elastic plate 3 are fixed two strain resistance 4 (Fig. 1, 3), for example, grades 2PKB-10-200 (TU 2B-01-100-68) one at a time on the upper and lower plane of the plate 3. The linear wear sensor is configured to connecting to a circuit for measuring electrical resistance and processing information, including strain gauge 5, digital voltmeter 6, interface unit 7 and computer 8 (Fig. 1). The strain resistance 4 are electrically connected to each other according to the bridge circuit (Fig. 2) and connected to the strain gauge 5.

The inventive device provides an increase in its sensitivity due to the location of strain resistance in the zone of tensile and compressive stresses, and also allows you to take into account the change in linear dimensions due to temperature. Correction of temperature changes is made by a variable resistance until the voltmeter readings are zero. In this device, a signal amplifier 8ANCH-7M can be used to amplify the signal.

A device for measuring wear of samples on a friction machine operates as follows.

After installing the samples in a working position, a wear sensor is installed on the friction machine body so that the preliminary deflection of the strain gauge 3 is 1 mm, which approximately corresponds to 3V according to the digital indication of the voltmeter 6. The friction pair is loaded along the axis of force N (Fig. 1). During the study, as the test sample is erased, the strain gauge 3 is bent after the lowering block 1. Information about the resulting bending of the strain gauge 3 is transmitted to the electronic computer complex using a digital voltmeter 6, which converts the analog information to digital and transfers it to computer 8 through the interface unit 7 where there is statistical processing of information and the issuance of results in the form of digital information.

Calibration of strain resistance 4 is carried out by setting strain gauge 3 to zero by indicator 9 and micrometer screw 10 (Fig. 3). Digital information from strain resistance is recorded by the computer complex.

Thus, the inventive utility model allows to reduce the time required for measuring wear of the test sample, as well as to provide the ability to take into account the change in linear dimensions due to temperature. In addition, the inventive device provides an increase in its sensitivity due to the location of strain resistance in the zone of tensile and compressive stresses.

Claims (1)

A device for measuring the total linear wear on a friction machine, comprising a pad, a roller, a drive shaft, a loading device, a linear wear sensor, characterized in that the linear wear sensor is an elastic plate on which two strain resistances are fixed, one on the upper and lower plane plates, electrically connected to each other by a bridge circuit, and configured to connect to a circuit for measuring electrical resistance and processing information, moreover, the elastic plate in one con ohm rigidly secured to friction machine, and the second is supported on the upper surface pads.

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