RU2456575C1 - Laboratory stand for evaluation of antiwear properties of rope wire, wire coating and lubricants - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: test stand consists of a mechanism for reciprocal movement, of a load with wire patterns and the lubricant feeder in the contact zone. The test stand is designed as a reference frame with wire samples fastened on it and vertical guides, with the ability of reciprocal movement of the carriage, with attached guide rollers and connected with the mechanism of the reciprocal movement.

EFFECT: simplified testing, simplification and optimisation of design, through implementation of the guide rollers on a carriage, which makes reciprocal movement, and moving the place of twisting of the wire samples.

1 dwg, 1 tbl

Description

The invention relates to techniques for the study of the tribotechnical properties of wire rope, wire coatings and lubricants.

A known friction machine (RU No. 2290622, G01N 3/56, 12/27/2006) containing a base, a counter sample holder mounted on it, a horizontal carriage and a test sample holder moving from a reciprocating drive, a loading device and a loading drive. The friction machine is equipped with a vertical movement carriage mounted on a horizontal movement carriage, with a sample holder fixed to it, a balancing device associated with the vertical movement carriage, a control computer, a matching device, a reciprocating drive control unit, a loading drive control unit, a force meter loading, an analog signal amplifier and an analog-to-digital converter.

A disadvantage of the known device is the study of the tribological properties of lubricants in limited conditions.

Known test bench "RSV - wire rope" (Kombalov VS Methods and means of testing for friction and wear of structural and lubricants: a reference. M .: Engineering, 2008, p. 384), consisting of two pairs of pulleys, with fixed on them with wire threads that rotate about an axis at a given distance, moving in such a way that the threads perform a longitudinal motion relative to each other. The application of the load is carried out by increasing the weight acting on the shoulders of the lever and pulleys, i.e. on the principle of a free roller. To the places of twisting of wire threads (360 °) through a rotary lubricating device, consisting of two felt pillows, lubricant is supplied. It is injected into the strand of the rope by shifting the cross-section of the rope joint under the action of tensile forces and by alternately bending the contact lines of individual wire strands in areas of low pressure. The drive is carried out by an electric motor with a worm and V-belt drive.

The signs of this device, coinciding with the essential features of the claimed invention:

- wire threads (samples);

- load;

- a lubricating device.

The disadvantages of the known device is the design complexity.

The objective of the invention is to simplify testing, simplify and optimize the design by performing guide rollers on the carriage, making a reciprocating motion, and moving the place of twisting of the wire samples.

The problem is achieved in that the test bench, consisting of a reciprocating mechanism, a load with wire samples and a lubricant supply device, according to the invention is made in the form of a support frame, with wire samples and vertical guides fixed thereon, with the possibility of reciprocating translational movement of the carriage along them, with guide rollers mounted on it and connected to a reciprocating movement mechanism.

Salient features of the claimed device, distinctive from the prototype, are:

- vertical guides;

- carriage;

- guide rollers.

The guide rollers provide longitudinal movement of the place of the friction unit (the place of twisting of the wire samples), prevent the unwinding of wire samples and allow you to adjust the contact angle of the wire samples.

The essence of the device is illustrated in the drawing, which shows a laboratory bench for evaluating the anti-wear properties of wire coatings and lubricants (hereinafter - laboratory bench).

The laboratory stand is a supporting frame 1, with vertical guides 2, with the possibility of reciprocating movement of the carriage 3 along them, with guide rollers 4 mounted on it, twisted wire samples 5 relative to each other, fixedly fixed on the frame 1 and connected to the loads 6 located at the bottom of the laboratory bench, and the mechanism of the reciprocating movement 7, located at the top of the laboratory bench, connected to the carriage 3.

The laboratory stand works as follows. The wire samples 5 are 360 ° twisted relative to each other and fixedly mounted on the frame 1, the free end of the wire samples 5 is loaded with a predetermined weight of the weights 6. The guide rollers 4 and the tension of the wire samples 5 prevent their self-unwinding. A lubricant is applied to the contact zone of the wire samples 5, then the reciprocating movement mechanism 7 is started. During the cyclic movement of the carriage 3, by means of the reciprocating movement 7, the friction unit (the place of twisting of the wire threads) performs longitudinal movement, due to which wear of wire samples 5.

Before and after the tests, the wire samples 5 are degreased, weighed, and the total wear is determined at various total loads according to formulas (1) and (2).

where And _i is the wear of one wire sample;

B ₁ - the weight of the wire sample before testing;

In ₂ - the weight of the wire sample after the test.

And _sum - total wear of wire samples;

And ₁ - wear of the first wire sample;

And ₂ - wear of the second wire sample.

It should be noted that to create the required contact angle of the wire samples 5, the guide rollers 4 can be mounted on the carriage plate 3 at the desired location, which is determined structurally, as well as to create a constant lubrication mode for the wire samples 5. In the contact zone of the wire images 5, a device can be installed constant lubricant supply (not shown in the drawing), which is a container for lubricant with holes for wire threads, or felt pads for liquid lubricants to.

The table presents the test results of the wear resistance of wire rope with a diameter of 1 mm, according to GOST 7372-79 "Steel wire rope. Specifications ”, Tests were carried out using rope lubricants and without lubrication. The value of weight wear was evaluated under identical conditions after 3000 cycles of carriage movement.

Table The results of tests conducted on a laboratory bench to assess the anti-wear properties of wire rope, wire coatings and lubricants Grease No. Spanish Total wear, gr 10 ^-5 No grease one 340,000 2 345,000 3 343,000 Grease 1 one 33,500 2 30,000 3 31,500 Grease 2 one 73,500 2 75,000 3 70,000

As can be seen from the table, the total wear of wire samples without lubrication is an order of magnitude higher than when using greases, thus, the device allows you to evaluate, by comparing the results, antiwear properties of wire rope, wire coatings and lubricants.

So, the claimed invention allows to simplify testing by simplifying and optimizing the design of the device.

Claims (1)

Test bench, consisting of a mechanism for reciprocating movement, cargo with wire samples and a device for supplying lubricant to the contact zone, characterized in that it is made in the form of a support frame with fixed wire samples and vertical guides with the possibility of reciprocating movement along a carriage with guide rollers mounted on it and connected to a reciprocating mechanism.