HK1029148B - Synthetic fibre cable - Google Patents

Description

The invention relates to a synthetic fibre rail, preferably of aromatic polyamide, as defined in claim 1.

Ropes are an important and highly demanding machine element, especially in conveyor technology, such as elevators, crane construction and mining, etc. The use of driven ropes, such as those used in elevator construction, is particularly complex.

For example, in elevator systems large rope lengths are necessary and the requirement of the smallest possible mass is made for energy reasons. High-strength synthetic fiber ropes, for example from aromatic polyamides or aramides with highly oriented molecular chains, fulfill these requirements better than conventional steel ropes.

The Aramid rope described above has satisfactory values in terms of service life, high abrasion resistance and bending resistance; however, the twisted artificial fibre rope under tensile stress tends to rotate around the longitudinal axis and/or twist upwards.

The purpose of the invention is to avoid the disadvantages of the known artificial fibre rail and to specify a permanently reliable rotating artificial fibre rail.

This task is solved by a synthetic fibre strand with the characteristics specified in claim 1, which is described in the dependent claims as a useful development and improvement of the invention specified in claim 1.

The advantages of the invention are that the interlayer with interlayer profiles adapted to adjacent beds provides a larger contact area with the beds and thus completely bridges the bed spaces of the beds adjacent to it. The fixed connection of inner and outer bed layers achieves a higher torsional stiffness of the bed rope, which prevents the rope from twisting regardless of the type of attacking rotor.

The invention therefore provides for a larger supporting and/or supporting cover surface even in the loaded state of the rope, which in turn results in a comparative moment introduction over the entire cover surface to the inside of the rope.

The appropriate elasticity allows the interlayer to accommodate different longitudinal movements of adjacent strips without relative displacement of the strips relative to the interlayer, which gives advantages in terms of bending and bending behaviour of the rope.

Further advantageous details are explained below by means of an example of the use of the interlayer of the invention shown in the figure. Figure 1, a perspective representation of a lift rope with an intermediate coat according to the invention,Figure 2, a cross-sectional view of the lift rope from Figure 1.

Figure 1 shows a rope 1 as used in elevator systems as a support and conveyor, for example to drive by a rope disc or rope drum. A cab frame of a cab in a lift shaft and a counterweight are connected by a rope. To raise and lower the cab and the counterweight, the rope runs over a drive drive driven by a drive motor. The drive torque is printed under the friction lock on the rope section above the corner of encirclement.

The rope 1 consists of a core sling 2 around which five identical sling 4 of a first seat 5 are placed in a screw-line in a first direction of impact 3 and with which ten sling 4, 7 of a second seat 8 are attached in parallel stroke under a balanced ratio between seat and rope rotation.

The second supporting structure 8 consists of two types of alternating arrangement of five identical strands 4, 7 each. The rope cross section shown in Figure 2 shows five more strands 7 of larger diameter, which lie in a screw-line shape in the valleys of the first supporting structure 5 while five strands 4 of the first supporting structure 5 of the same diameter lie on the heads of the first supporting structure 5 and fill the gaps between three adjacent strands 7 of greater diameter. In this way, the two parallel strands 9 obtain a second supporting structure 8 of almost circular diameter, which have the same advantages as described below. The resulting load is distributed in the direction of the first supporting structure 9 in the direction opposite to the second supporting structure 11 in the direction of the second supporting structure.

Between the second stroke-secured cover layer 11 12 and the second seat layers 4, 7 8, there is a gap 13 The gap 13 is made of an elastically deformable material such as polyurethane or polyester elastomers and is injected or extruded onto the secured rope cores 9 In this process, the newly formed gap 13 is plastically deformed, closely attaching to the perimeter contours of the seat layers 8 and 12, filling all the gaps and retaining the imprinted grooves 18, 19 of the adjacent lines 8, 12.

The profiled interlayer 13 envelops the second seat 8 in a tubular form, thus preventing the straps 4, 7 from coming into contact with the straps 10. In this way it avoids the straps 4, 7, 10 from wearing out due to friction between them when the rope 1 is running over the drive, as a result of relative displacements of the straps 4, 7, 10 between themselves, which they make to compensate for tension differences, e.g. by shifting the rope under the load on the drive.

The intermediate sheath 13 also provides a smooth and uniform transmission of torque built up under load on cable 1 in the cover cleat position 12 to the second seat position 8 and thus on the rope core 9, the parallel distribution of which creates torque opposite to the direction of impact 3.

At the same time, the frictional resistance between the strips 4.7,10 and the interlayer 13 is chosen with u > 0.15 in such a way that there is almost no relative movement between strips and the interlayer 13, but the interlayer 13 follows the compensatory movements by elastic deformation.

The radial distance of the cover layer 12 from the axis of rotation of the rope 1 can be controlled over thickness 20 of the intermediate layer 13 to neutralize the torque ratio of the opposite-directional torques of the cover layer 12 and the parallel-swept core 9 acting on the loaded layer 1 in order to control it. Thickness 20 of the cover layer 13 must be chosen with increasing diameters of the layers 10 and 4 and 7 respectively. In any case, the thickness 20 of the cover layer 13 must be dimensioned so that in the loaded state, with fully filled spaces 21, 22 between the layers, a residual plastic cover thickness of 0,1 of layers 4,7 and 10 of the layers 12 and 8 of the loaded layer can be neutralized. The minimum deformation effect between the layers 4 and 7 is ensured by measuring the volume of the interlayer by the volume of the second layer.

In addition to its use as a simple support rope, the rope can be used in a wide variety of conveyor systems, e.g. for elevators, shaft conveyor systems in mining, load cranes such as construction, hall or ship cranes, cableways and ski lifts, as well as as a means of pulling on escalators.

Claims (7)

1. Synthetic fiber rope consisting of at least an inner and an outer concentric layer of load-bearing synthetic fiber strands (2, 4, 7, 10) laid together, and between the inner layer of strands (5, 8) and the outer layer of strands (12) hose-shaped intersheath (13) which surrounds the inner layer of strands (5, 8), characterised in that the intersheath (13) has circumferential sheath surfaces which are adapted to the external contours of the adjacent layers of strands (8, 12).
2. Synthetic fiber rope according to claim 1, characterised in that the coefficient of friction u between the strands (4, 7, 10) and the intersheath (13) is greater than 0.15.
3. Synthetic fiber rope according to claim 1, characterised in that the total elongation of the intersheath (13) is greater than the maximum occurring relative movement of the strands (4, 7, 10) amongst one another.
4. Synthetic fiber rope according to claim 1, characterised in that the sheath surfaces are grooved.
5. Synthetic fiber rope according to claim 1, characterised in that the grooves (18, 19) are formed to be helical, wherein the direction (11) of rotation on the outer surface of the sheath is opposite to the direction (3) of rotation of the grooves (19) on the inner surface of the sheath.
6. Synthetic fiber rope according to claim 1, characterised in that the thickness s of the sheath (20) at the thinnest point is 0.1 mm.
7. Elevator installation with a synthetic fiber rope according to one of claims 1 to 6 for drive by a traction sheave or a rope drum.