JP4558034B2 - Elevator rope inspection equipment - Google Patents

Description

  The present invention relates to an elevator rope inspection apparatus, and is particularly suitable for an apparatus for inspecting a resin-coated rope for damage.

  The wire rope used in the elevator may be broken sequentially in the unlikely event that the steel wire as a constituent element is caused by fatigue or wear. There is a possibility that the number of breaks may increase over time. When the number of breaks exceeds a predetermined number, it is determined that the wire rope has reached the end of its life and is replaced. For this reason, the broken portion of the steel wire is confirmed by visual inspection or a measuring instrument through periodic inspections to evaluate whether the wire rope can be used safely.

  In elevators, in recent years, resin-covered ropes covered with a resin having excellent flexibility have begun to be used for the purpose of reducing the size of the hoisting machine and the diameter of the sheave. Causes of resin-covered ropes reaching the end of their life include fatigue caused by bending extension when passing through sheaves, fretting wear due to relative sliding between strands, wear of rope outer layer resin caused by contact with sheave groove walls, etc. Is mentioned. In making a life diagnosis of a resin-covered rope, it is considered that it is not sufficient to visually check for a broken wire or strand.

  Therefore, as a life diagnosis of a rope having a structure in which strands and schenkels covered with resin are arranged at predetermined intervals, a constant current source is connected between both ends of the strands of the resin-coated rope, current is passed to measure the electrical resistance, and the rope A device for inspecting the presence or absence of wire breakage is known, and is described in Patent Document 1, for example. For example, Patent Document 2 discloses a method in which a conductor is arranged on the outer periphery in the coating, and the damage state of the rope outer layer resin is determined by detecting that the conductor and the sheave surface are electrically connected.

Special Table 2002-540419 WO02 / 012108 publication

  In the above-described prior art, even if the wire breakage occurs, if the cut surfaces are in contact with each other, the change in electrical resistance is small, and the detection result varies depending on the state of the wire breakage, making high-precision measurement difficult. Therefore, there is a possibility that the damaged state cannot be detected until a certain number of rope strands are broken. Moreover, it is necessary to measure for each of a plurality of strands, which complicates the apparatus. In the second prior art, only damage to the outer layer coating can be detected.

  The object of the present invention is to detect the damage of the outer layer coating and the phenomenon before the strand of the resin-coated rope is broken, even in the case of a rope having a structure in which strands and schenkels covered with resin are arranged at predetermined intervals, Is to reliably detect the state of the rope damage at an early stage.

In order to achieve the above object, the present invention provides an elevator rope inspection in which strands formed by twisting metal strands are further twisted to form a schenkel, and a plurality of the schenkels are inspected in a coating resin at predetermined intervals. In the apparatus, the schenkel is further twisted and disposed in order in the circumferential direction of the rope, and is grouped every odd number and even number to detect the presence or absence of electrical contact between the odd and even schenkel.

  According to the present invention, since the presence or absence of electrical continuity between adjacent ones of a plurality of strands or schenkels is detected, it is possible to detect a break in the strands with a simple device configuration, and it is possible to grasp the rope damage state at an early stage.

  In general, a rope is formed by twisting strands formed by twisting metal strands into a rope. Alternatively, the strands are twisted to form a schenkel, which is further twisted to form a rope.

  FIG. 1 shows the configuration of the rope inspection apparatus. This rope inspection apparatus is provided with a plurality of Schenkels 8, 11, 12, 16, 17, 18, and 19 and is intended for a rope 2 whose outer layer is covered with a resin 9. In addition, the inspection device is permanently installed in the rope 2 in order to grasp the damaged state of the rope 2 every predetermined time.

  The rope 2 repeats bending every time it passes through the sheave 1 while receiving tension due to a load with the car and the counterway. If the use is continued for a long period of time, a slight speed deviation occurs between the resin and the wire, and the resin side may be gradually worn by friction between the two. As a result, the schenkel covered and independent with the resin can move within the resin, and in the unlikely event that the schenkels may contact each other. If the rope is bent in this state, the pressure is increased at the portion where the schenkels are in contact with each other, and wear may develop and the wire may break. Therefore, it is desired to grasp the sign of the rope life by detecting the contact between the schenkels before breaking.

  A continuity detector 3 is provided to detect the presence or absence of electrical continuity between adjacent schenkel among a plurality of schenkels 8, 11, 12, 17, 18, 19 in the rope. The continuity detector 3 is inputted with the Schenkels 8, 12, 18 and Schenkels 11, 17, 19 not being adjacent to each other being electrically connected. The monitoring center is provided with a diagnostic device 4 for diagnosing whether the rope has reached the end of its life based on the output result of the continuity detector 3 and an alarm device 5 for prompting a warning when it is determined that the rope has reached the end of its life. The diagnosis result from the diagnosis device 4 is transmitted to the monitoring center by communication means not shown.

  FIG. 2 is a cross-sectional view of a rope that is a target of the rope inspection apparatus. In the rope 2, a strand 15 formed by twisting metal strands 13 is further twisted to form a schenkel 12, which is further twisted to form the rope 2. A core schenkel 16 is arranged at the center of the rope 2, and a plurality of schenkels 8, 11, 12, 17, 18, 19 are arranged at substantially equal intervals in the circumferential direction of the rope 2. An inner layer resin 10 made of polyurethane, for example, is provided between the core Schenkel 16 and the Schenkel 8, 11, 12, 17, 18, 19.

  Further, an outer layer resin 9 made of polyurethane, for example, is provided around the schenkels 8, 11, 12, 17, 18, and 19. Therefore, each Schenkel is individually covered and protected by resin. Of the Schenkels 8, 11, 12, 17, 18, and 19, the non-adjacent Schenkels 11, 17, and 19 are referred to as odd Schenkels 7, and the remaining non-adjacent Schenkels 8, 12, and 18 are referred to as even Schenkels 6.

  FIG. 3 shows a detection circuit of the continuity detector of the rope inspection apparatus. The odd Schenkel 7 is grounded through a resistor R4. The even Schenkel 6 is connected to a + 5V power supply via a resistor R1. The odd terminal Schenkel 7 is connected to the base terminal of the transistor Q1 through a resistor R3. The collector terminal of the transistor Q1 is connected to the + 5V power source via the resistor R2, and the emitter terminal is connected to the ground terminal. Here, the change in the voltage Va between the collector terminal and the emitter terminal of the transistor Q1 is monitored to detect the presence or absence of contact between adjacent schenkels.

  FIG. 4 shows a method of connecting the rope and the continuity detector. The rope end is generally connected to the rope end support member 21 via the rope socket 23, the thimble lot 22, and the elastic member 20. Reference numeral 24 denotes a rope clip. Here, the connection between the rope 25 and the continuity detector is performed by peeling off the resin at the end of the rope after being bound by the rope clip 24 at the rope socket 23, and odd schenkel 7 (11, 17, 19) and even schenkel respectively. 6 (8, 12, 18) are bundled separately and connected to the extension cables 43, 44 by, for example, crimp terminals (not shown) and connected to the continuity detector. After the resin is removed so that the odd-numbered and even-numbered schenkels do not come into contact with each other at the crimping portion, for example, measures such as insulating the side surfaces of the schenkel are taken.

  Next, as shown in FIG. 5, the operation when the adjacent schenkel 8 and schenkel 19 of the rope 2 are in contact with each other inside the rope will be described.

  In FIG. 3, when the schenkels are not in contact with each other, no current flows through the base terminal of the transistor Q1, so no current flows from the collector terminal side to the emitter terminal side of the transistor Q1, and the collector-emitter voltage Va. Is about 5V. On the other hand, when the Schenkels 8 and 19 are in contact with each other (when the broken line 26 is connected), the current 27 flows through the base terminal of the transistor Q1, the transistor Q1 operates, and the emitter terminal side from the collector terminal side Current 28 flows to the collector, and the collector-emitter voltage Va becomes approximately 0V. Therefore, the contact between Schenkels can be detected by detecting the change in the collector-emitter voltage Va. The same operation is performed even if other odd-numbered and even-numbered schenkels come into contact with each other. In addition, since this detection circuit is provided with a ground terminal and can output a voltage based on the ground terminal, it can be taken into an elevator control board or the like, and this output voltage value can be easily sent to the monitoring center by communication means. It becomes.

  FIG. 6 is a cross-sectional view of a flat rope whose outer layer is covered with a resin. A plurality of strands in which strands are twisted (or a schenkel in which strands are further twisted) 36 to 40 are covered with a resin 41 and are arranged at intervals in the lateral direction. Even in such a flat resin rope 34, if the change in the contact state between adjacent strands (Schenkel) is detected by the continuity detector 42, the unbalanced state of the rope components can be detected and the rope replacement time can be grasped.

  Next, a description will be given of a rope inspection device that detects the life of a rope by simultaneously detecting the wear of the rope outer layer covering in addition to detecting the contact between Schenkels.

  FIG. 7 shows a rope inspection device. The difference from the above-described contact detection between schenkels is that a conduction state between a sheave around which a rope is wound and a schenkel disposed in the rope is detected. There are three combinations that need to grasp the conduction state: odd number Schenkel and even number Schenkel, odd number Schenkel and sheave, and even number Schenkel and sheave.

  FIG. 8 is a continuity detection circuit, and the sheave is grounded through a resistor R4. The odd Schenkel is connected to the + 10V power supply through resistor R5. The even schenkel is connected to the + 5V power line through resistor R1. And the detection circuit used with the conduction | electrical_connection detector between Schenkel mentioned above is applied to the circuit for detecting the conduction | electrical_connection state of even number Schenkel and sheave 1. FIG. On the other hand, transistors Q2, Q3 and Q4 are arranged between the + 10V power source and the ground. The transistors Q3 and Q4 constitute a current mirror circuit, and the voltage level of the voltage Vb changes in the range of 0 to 5V as a configuration in which the current flowing through Q3 is duplicated and sent to Q4. Then, by monitoring changes in the collector-emitter voltages Va and Vb of the transistors Q1 and Q4, the presence or absence of contact between adjacent schenkels and the presence or absence of contact between schenkels and sheaves are detected. When the schenkel and the sheave are not in contact, no current flows through the transistors Q1 to Q4, and the voltages Va and Vb indicate about 5V.

  When the Schenkel 19 (odd Schenkel 7) contacts the sheave 1 (when the alternate long and short dash line 29 is connected), the transistor Q2 operates and a current 31 flows between the collector and the emitter. Along with this, the transistors Q3 and Q4 also operate, and currents 32 and 33 flow. Therefore, the voltage Vb of the transistor Q4 changes from about 5V to about 0V. Further, the transistor Q1 also operates, the current 28 flows, and the voltage Va changes from about 5V to about 0V.

  When Schenkel 18 (even Schenkel 6) and Schenkel 19 (odd Schenkel 7) are in contact (when broken line 43 is connected), transistors Q2, Q3 and Q4 operate and voltage Vb changes from about 5V to about 0V. However, since the transistor Q1 does not operate, the voltage Va remains at about 0V. When Schenkel 18 (even Schenkel 6) and sheave 14 come into contact, only transistor Q1 operates, voltage Va changes from 0V to + 5V, and voltage Vb remains at 5V.

  The continuity detection circuit as described above can detect three sets of continuity states by monitoring voltage changes of the voltages Va and Vb. The detected voltage value or its information is sent from time to time to the monitoring center by communication means to diagnose whether the rope is at the end of its life or not with a diagnostic device. Prompt.

  Further, if the rope core schenkel 16 is electrically connected to the sheave, the contact between the side schenkel and the core schenkel can also be detected. Since the core schenkel 16 does not contact the sheave 1 before the side schenkel, it is not necessary to detect the continuity between the core schenkel 16 and the sheave.

  The continuity detector may not be connected to the rope at all times but may be connected and inspected only during periodic inspection. Furthermore, the rope inspection device may be used as an acceptance inspection device for the manufactured rope, and the initial rope defective product can be easily selected.

The apparatus block diagram which shows one Embodiment of the rope inspection apparatus by this invention. The rope sectional view of one embodiment of the rope inspection device by the present invention. The conduction | electrical_connection detection circuit of one Embodiment of the rope inspection apparatus by this invention. The rope end part connection block diagram by one Embodiment. The figure explaining the rope damage state by one embodiment. Rope sectional drawing which shows other embodiment. The apparatus block diagram which shows other embodiment. The conduction detection circuit which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheave 2 Resin rope 3 Continuity detector 4 Diagnosis device 5 Alarm device 8, 11, 12, 17, 18, 19 Schenkel 9 Outer coating resin 16 Core Schenkel 34 Flat resin rope Q1-Q4 Transistor R1-R7 Resistor

Claims (4)

In an elevator rope inspection device for inspecting a rope in which a strand obtained by twisting metal strands is further twisted into a schenkel, and a plurality of the schenkels are arranged at predetermined intervals in the coating resin,
The schenkel is further twisted and arranged in order in the circumferential direction of the rope. apparatus. The elevator rope inspection apparatus according to claim 1, wherein the rope is bundled at odd and even numbers at the end of the rope. The elevator rope inspection according to claim 1, further comprising a sheave around which the rope is wound, and detecting the presence or absence of electrical contact between the odd-numbered schenkel and the sheave and the even-numbered schenkel and the sheave. apparatus.   The elevator rope inspection apparatus according to claim 1, wherein information based on the detected result is transmitted to a monitoring center, and the rope life is diagnosed at the monitoring center.

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