HK1030245B - Detection of damage to the sheath of a synthetic fiber rope - Google Patents

Description

The invention relates to a device for detecting damage to the rope coat of a synthetic fibre cable, as defined in claim 1.

A rope coat is a textile product made of natural or chemical fibres, either by twisting the rope without twisting, by two or more layers of coatings and/or wrapping or by interwoven. The coat protects the rope structure from the so-called artificial fibres and produces the necessary traction for powered ropes. It is preferably made of abraded plastic material and is firmly and/or formally connected to the outer layer of the rope. The coat covers the rope as a whole or the outermost layers of the rope with a plastic coat and forms the coat.

The applicant's claim for annulment of the contested decision was based on the fact that the applicant had not provided any evidence that the applicant had not been involved in the infringement of Article 85 (1) of the Treaty and that the Commission had not taken any action to prevent the applicant from bringing an action for annulment of the contested decision.

The problem therefore arises of specifying a device for detecting damage to a rope coat which reliably detects damage to the rope coat regardless of the cause of the damage.

A damage detection system according to the invention has several advantages. Due to the breakdown device embedded in the rope coat, a permanent measurement monitoring of the rope coat is possible. A signal over a certain length is transmitted through the breakdown device. If this connection is interrupted, the rope coat has been damaged from the outside.

The break element may be an electrical conductor, a light conductor or the like, and the essential factor in the choice of the conductive material used is a resistance to continuous bending at least equivalent to that of the cable structure, so that a material failure due to operation is excluded.

For example, the break-off element may be an electrical conductor in the form of a carbon fibre or metal wire through which a control signal is sent.

In conjunction with a control device, damage to the cable-laying material can be detected by the control and appropriate measures can be taken without delay to ensure safe operation of the lift.

The transmission element is preferably wrapped around the whole rope or the ribbons of the outer shell and covered by the rope coat, preferably by the pressure-spraying process. In addition, in a version with a two-layered rope coat, the break-off element can be placed on the inner layer of the rope coat and covered by the second layer of the rope coat.

Another preferred design has several breakers parallel to the straps and/or embedded along the length of the rope around the rope in the cowl, which offers the advantage of a broadly-wide monitoring of the cowl for external mechanical damage.

The invention also provides for the additional advantage of reinforcing the rope coat by making the conductive element of a high-strength material, which can improve the bending resistance and abrasion of the rope coat.

The following illustration of the invention is given by way of example and in relation to the accompanying drawing:Figure 1, a multilayered aramid fibre rail with a transmission element wrapped around the cable in a screw-line shape and embedded in the cable housing,Figure 2, schematically a monitoring circuit for the aramid fibre rail shown in Figure 1,Figure 3, a control circuit circuit diagram.

The perspective illustration in Figure 1 shows the structure of a coated aramid fibre rail 1 of aramid fibre linings 2, which together with fillings 3 are arranged in layers around a core 4. Between an inner liner 5 and an outermost liner 6 there is a friction-reducing, preferably profiled intermediate coat 7. The outermost liner 6 is covered by the rope coat 8, preferably made of polyurethane or polyamide. Around the outermost liner 6 there is a copper wire 9 screw-like lines wrapped around the entire rope with a cup 10 of 1-4 wind lines per 60 rope perimeter. For example, the top layer of the 9 of the 8x liner is coated so that the top layer is covered in 9 mm of wire and the rope coat is covered with this.

If several breakers are used, they can in principle be arranged in any way in the rope coat on the rope, provided that they form a signal-transmitting connection over a specified length of rope and that the breakers are not touched by the surrounding rope coat material.

Instead of wrapping the copper wire 9 around the rope 1, it may also be inlaid in the cowl 8 parallel to the aramid fibres 2 of the outermost liner 6 in the cowl. However, in such a parallel arrangement it is desirable to provide for a large number of copper wires evenly distributed over the circumference of the rope 1 in order to achieve the most comprehensive monitoring of the cowl 8 possible. This arrangement is particularly advantageous in a twisted or beaten rope construction, because there the angle of impact results in a slope of the copper wires 9 - or generally the transmission elements - to the direction of the rope 1's movement, which is achieved by a coupler driven by a line 1 on the cowl, which is more advantageous, for example, as a sliding or sliding object, and which is immediately recognized as a hazardous object, for example by a sliding or sliding barrier.

Figure 2 shows the measurement of the aramid fiber wire 1 shown in Figure 1. To check whether the conductive connection made by means of the break-off element (s) (here the copper wire 9) over the length of the rope 10 or a certain section of the rope is intact, an electrical voltage can be applied to the two ends of the transmission element in a control circuit 11, for example.

The ammeter 13 may be replaced by a control lamp in the circuit which, in the event of failure, shall be switched off or on when the transmission line is interrupted, depending on the type of circuit.

In addition, damage to the cable casing 8 can be detected by means of a control circuit 21 connected to the monitoring circuit 11. A suitable circuit has been identified, for example, from EP 0 731 209 A1. In this known control circuit 21 shown in Figure 3, a constant current 15 is fed through a voltage supply 14 to the transmission element 9 for which each transmission element 9 represents a resistance R1 to Rn. A low pass filter 16 filters the incoming pulses and transmits them to a switch 17 The heavy wave switch 17 eases the measured voltages. When the specific limit values are exceeded, i.e. when a switch is passed through the transmission element 9, the resistance is increased to 20 T. This information can be stored at a speed exceeding the maximum permitted speed of the switch 18 or 19 T. This information is obtained by means of a logarithmic rate of flow of the resistance.

Each transmission element 9 is wired accordingly and constantly checked. As soon as a failure occurs, the elevator control turns off the elevator by driving the elevator cabin into the evacuation position and locking it.

Claims (7)

1. Device for damage detection for a rope sheath (8) of a synthetic fiber rope, with at least one breaking element which can be destroyed by damage, and with means of control (11, 12, 13, 21) which function together with the breaking element to make occurrence of damage detectable characterized in that the breaking element (9) is embedded in the rope sheath (8).
2. Device according to Claim 1, characterized in that the breaking element (9) is positioned around the rope (1).
3. Device according to Claim 1, characterized in that the breaking element (9) is positioned in the direction of the length of the rope.
4. Device according to one of claims 1 to 3, characterized in that the synthetic fiber rope (1) has an outermost layer of strands (6), and that the breaking element (9) is arranged helically around the outermost layer of strands (6) and/or parallel to the aramide fiber strands (2).
5. Device according to Claim 1 or 2, characterized in that at least one electrical conductor or optical conductor is provided as breaking element (9).
6. Device according to one of the Claims 1 to 5 characterized in that a control circuit (11, 21) is provided for the transmission of a control signal through the breaking element (9).
7. Elevator installation with a synthetic fiber rope as a suspension means connecting an elevator car with a counterweight, the synthetic fiber rope having a rope sheath (8) and a damage indicator according to one of the Claims 1 to 6.