SU1364960A1 - Arrangement for testing specimens of elastomeric materials for friction and wear - Google Patents

Description

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The invention relates to a test apparatus for determining the mechanical characteristics of products, namely for testing the friction and wear of elastomer specimens in hydro-pneumatic cylinders of reciprocating motion.

Any elastomeric sealant can be used as a test sample: a ring of circular, oval and rectangular cross section, a cuff, a combined sealant, etc.

The purpose of the invention is to increase the test accuracy at high pressures of the working medium.

Figure 1 shows a device for testing samples of elastomeric materials; figure 2 - section aa in figure 1.

The device (Fig. 1) contains a cylinder 1 with a working medium, a rod 2 installed therein, a holder 3 of sample 4, a drive 5 of reciprocating movement, a force detection unit 6. The holder 3 is mounted on the rod 2 with a predetermined gap inside the cylinder 1, and the registration unit 6 (FIG. 2) is executed in the form of beams; rectangular section, connecting in the radial direction cylinder 1 and holder 3.

Cylinder 1 is fitted with clamps 7 and fixed to plate 8. In covers 7 you

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annular grooves for seals 9 are filled, preventing leakage of working medium from cylinder 1. Inside the latter there is a thrust stan 10 for fixing the node 6, which is connected to the measuring complex 11 by means of a sealed connector 12. The holder 3 is fixed by means of a retaining ring 13, A hole 14 is made in cylinder 1 for inlet

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the working environment in the cavity of the cylinder 1. The stem 2 with the actuator 5 is connected by a pull 15. As a sample 3, a material with a module not lower than 3 MPa is used,

The device works in the following manner.

Sample 4 is installed in the seat of the holder 3, which is then inserted into the node 6 and secured with a retaining ring 13. The node 6 with the holder 3 and the test sample 4 is installed in the cylinder 1 and secured by means of an anvil cup 10.

Through a sealed connector 12, the node 6 is connected to the measuring complex 12. Seals 9 are inserted into the seats of the covers 7 and screwed into the cylinder 1. A slot 2 is installed in the guide 7 of cylinder 1 of the cylinder 1, and a gap is formed between the holder 3 and the stem 2, which excludes the friction of the holder 3 on the rod 2. The rod 2 is connected by a rod 15 to the drive 5 of the reciprocating movement. From a source (not shown) of constant pressure, through the opening 14 into the cavity of cylinder 1, the working medium is supplied under a certain pressure, acting on the test sample 4 from two sides. The drive 5 of the reciprocating motion and the measuring complex 11 are turned on. At the same time, the measuring complex 11 continuously records the frictional force that occurs only between the studied elastomeric sample 4 and the surface of the rod 2 for a given radial deformation of the sample 4 and a constant working pressure. The wear of the elastomeric sample 4 is determined by the difference in mass of the sample before and after testing on an analytical balance.

FIG. 2

Claims (1)

DEVICE FOR TESTING SAMPLES FROM ELASTOMERIC MATERIALS FRICTION AND WEAR, containing a cylinder with a working medium, a rod, a sample holder, a drive for reciprocating movement of the holder and a force measuring unit, characterized in that, in order to increase the accuracy of the test at high pressures of the working medium, the holder is mounted on the rod with a given clearance inside the cylinder, and the registration unit efforts made in the form of beams of rectangular cross section, connecting in the radial direction of the cylinder and the holder. SU „„ 1364960 Figure 1