RU2374627C1 - Device for ropes fastening at their testing - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: device for fastening ropes during their testing comprises fastening means which is made as a race with a groove for the rope placement with its width being equal to the rope diametre and depth being defined on the basis of the relation H≤D-d, where D stands for the rope diametre, d - for the minimal diametre of the wire in the rope strand outer layer; the race face ends are fitted by pressure plates.

EFFECT: expanded device functionality at defining friction characteristics of the rope.

4 cl, 8 dwg

Description

The device relates to the field of experimental methods of mechanics of a deformable solid and can be used as a device for attaching a steel rope, in particular when evaluating its frictional characteristics (coefficient / friction force, wear resistance, etc.).

A device is known for testing a rope hoist with a friction pulley (see Andreev A.V. Friction transmission. - M.: Mashinostroenie, 1978, p. 91, Fig. 49). The device contains a properly controlled rope, a friction pulley, loads and a device for fixing loads in the system (dynamometer).

The disadvantage of the analog device is the impossibility of its application for the entire range of frictional characteristics, because it is intended only to determine the coefficient of friction.

The closest in technical essence to the claimed device is a device selected as a prototype for determining the coefficient of friction, containing pressure plates, a piece of edging, a dynamometer (see Andreev A.V. Friction transfer. - M.: Mechanical Engineering, 1978, p.90 , fig. 48). With this device, the coefficient of friction is determined by pulling a rope with a compressed load P between two plates.

The disadvantage of the prototype device is that this design does not include wear tests and, in addition, the length of the test cable must be of considerable length.

The objective of the invention is to expand the functionality of the device when determining the frictional characteristics of the rope.

The problem is solved in that:

1. The device contains a clip with a groove for accommodating the rope. The width of the groove is equal to the diameter of the rope for better fixation. The depth of the groove is determined from the design of the rope and is determined from the ratio:

H≤D-d,

where D is the rope diameter, d is the minimum wire diameter of the outer layer of the rope strand.

For better rope fixation, clamping strips are placed on the ends of the cage.

The proposed device can be used on testing machines that make it possible to control the frictional characteristics of the rope, for example, a friction machine of the brand SRV-III (Germany).

Figure 1 schematically shows a device for attaching ropes when they are tested. Figure 2 shows a cross section of the proposed device.

The device comprises a block 1, in which there is a groove 2, clamping strips 3, which are attached to the ends of the cage with screws 4.

The device operates as follows.

In the groove 2 of the block 1, a segment of a steel rope 5 impregnated with rope lubricant is laid. In order to better grip the rope with the clip and prevent it from turning during the test, a composition is introduced that is capable of providing strong adhesion between the test specimen and the clip (item 6), for example, the adhesive composition of the ED-6 brand. To prevent the longitudinal movement of the segment of the rope during the test from the ends of the pads there are clamping straps 3, which are attached to the block 1 with screws 4.

2. The device may contain a clip that differs from claim 1 in that the groove 2 has a cylindrical shape. Moreover, the diameter of the groove 2 is equal to the diameter of the rope. The depth of the groove is determined from the ratio:

H≤D-d.

For better rope fixation, clamping strips 3 are placed on the ends of the cage.

Figure 3 schematically shows a device for attaching ropes during their testing. Figure 4 shows a cross section of the proposed device.

The device comprises a block 1, in which there is a cylindrical groove 2, clamping strips 3, screws 4.

The device operates as follows.

In a cylindrical groove 2 pads 1 fit a piece of rope 5, impregnated with lubricant. In order to better grip the rope with the clip and prevent it from turning during the test, a composition is introduced that is capable of providing strong adhesion between the test specimen and the clip (item 6), for example, the adhesive composition of the ED-6 brand. To prevent the longitudinal movement of the segment of the rope during the test from the ends of the pads there are clamping straps 3, which are attached to the block with screws 4.

3. The device may include a clip 1 with a groove 2 for accommodating the rope. This device differs from the device according to claim 1 in that it has additional patch plates 3 that form a groove 4. The depth of the groove in the clip is determined from the specified ratio

H <D-d-h,

where h is the thickness of the plate

Figure 5 schematically shows a device for attaching ropes when they are tested. Figure 6 shows a cross section of the proposed device.

The device comprises a ferrule 1, in which there is a groove 2, a pressure plate 3, in which there is a through groove 4, screws 5.

The device operates as follows.

A piece of rope 6 is laid in the groove 2 of the holder 1. A patch plate 3 is laid on top and fixed with screws 5. Moreover, the patch plate 3 reliably clamps the rope 6 between the clip 1 and the plate 3.

4. The proposed device can be made in the form of a cylinder with radial grooves, which are located on the generatrix of the clip.

Figure 7 schematically shows a device for attaching ropes during their testing. On Fig shows a cross section of the proposed device.

The device contains a clip 1, made in the form of a cylinder. Radial grooves 2 are made on the forming collar, into which the tested rope 3 is placed.

The device operates as follows.

In the groove 2 of the cage 1 fits a piece of rope 3, impregnated with lubricant. The rope is fastened to the roller using a composition that provides reliable adhesion between the segment of the rope and the clip (key 4), for example, the adhesive composition of the ED-6 brand.

Claims (4)

1. A device for attaching ropes during their testing, containing means for attaching it, characterized in that the attachment means is made in the form of a clip with a groove for accommodating a rope with a width equal to the diameter of the rope and a depth determined from the relation H≤Dd,
where D is the diameter of the rope, d is the minimum diameter of the wire of the outer layer of the strand of the rope, while the clamping bars are placed on the ends of the cage. 2. A device for attaching ropes during their testing according to claim 1, characterized in that the groove has the shape of a cylinder with a diameter equal to the diameter of the rope. 3. The device for attaching the ropes when tested according to claim 1, characterized in that the cage is made by the team and is equipped with additional patch plates forming a groove, and the depth of the groove is determined from the specified ratio
H≤Ddh,
where h is the thickness of the plate. 4. A device for attaching ropes when tested according to claim 1, characterized in that the cage is made in the form of a cylinder with radial grooves located on the generatrix of the cage.

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