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Damage detecting device for wire rope

A flaw detection device and wire rope technology, which is applied in the direction of material magnetic variables, etc., can solve the problems of complex wire rope structure, wire breakage, and small output of electromagnetic detection sensors.

Active Publication Date: 2011-06-01
HITACHI BUILDING SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, the use of wire ropes has become more and more, and the structure of wire ropes has become more and more complicated, so sometimes the wires inside the wire ropes are broken.
[0009] The flaw detection devices shown in the above-mentioned Patent Document 1 and Patent Document 2 evaluate whether the steel wire is broken according to whether the output waveform obtained by the magnetic detection unit has a peak value, so the broken position of the steel wire exists in the inside of the steel wire rope, the broken part and the electromagnetic detection unit. When the distance from the sensor is long, the output of the electromagnetic detection sensor becomes smaller, and the damage degree of the wire rope cannot be correctly judged.

Method used

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  • Damage detecting device for wire rope
  • Damage detecting device for wire rope
  • Damage detecting device for wire rope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, the flaw detection device of the steel wire rope in this example is mainly composed of the following components: a magnetizer (the magnetization unit) 2 that magnetizes the steel wire rope 1 along the length direction; electromagnetic sensors (magnetic detection units) 3a~3p, thus surrounding the steel wire rope 1; a corrector 4 for correcting the output signal values ​​of these 16 electromagnetic sensors 3a~3p; The first memory (storage unit) 5a for the correction value and position information of the sensors 3a-3p; the comparator 6 for comparing the output signal values ​​of the electromagnetic sensors 3a-3p corrected by the corrector 4; 4 The sum of the output signal values ​​of the corrected electromagnetic sensors 3a to 3p is used to determine the calculation part 7 of the damage degree of the steel wire rope; the second memory (storage part) 5b that stores the coefficient used by the calculation part 7; An output device 8 for outputting...

Embodiment 2

[0060] Figure 9 A flaw detection device for a steel wire rope according to Example 2 is shown. The wire rope flaw detection device of this example is characterized in that time delay circuits 9a to 9p are provided in the preceding stage of the calculation unit 10; the calculation unit 10 multiplies coefficients by the electromagnetic sensors 3a passing through these time delay circuits 9a, 9b, 9c... ~ 3P output signal.

[0061] Like the flaw detection device of the steel wire rope in Embodiment 1, the flaw detection device of the steel wire rope of this example also has: the magnetizer 2 that magnetizes the steel wire rope 1 along the longitudinal direction; The electromagnetic sensors 3a to 3p surround the steel wire rope 1 . The outputs of the electromagnetic sensors 3a to 3p are input to the calculator 10 after passing through the time delay circuits 9a to 9p.

[0062] Calculator 10 reads in sequence according to the output of time delay circuit 9a, the output of time d...

Embodiment 3

[0065] Figure 11A flaw detection device for a steel wire rope according to Example 3 is shown. The wire rope flaw detection device of this example is characterized in that: the outputs of the electromagnetic sensors 3a, 3b, 3c, 3d, and 3e are respectively input into time delay circuits 9a and 9q, 9b and 9r, 9c and 9s, and 9d with different time constants. and 9t, 9e and 9u (in Figure 11 The illustration of 9t and 9u is omitted in ).

[0066] Like the flaw detection device of the steel wire rope in Embodiment 1, the flaw detection device of the steel wire rope of this example also has: the magnetizer 2 that magnetizes the steel wire rope 1 along the longitudinal direction; The electromagnetic sensors 3a to 3p surround the steel wire rope 1 . The outputs of the electromagnetic sensors 3a-3p are input to the calculator 11 after passing through the time delay circuits 9a-90.

[0067] In the wire rope flaw detection device of this example, the outputs of the electromagnetic s...

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Abstract

The invention provides a detecting device of a wire rope, comprising: a magnetizing means (2) which magnetizes a wire rope (1) along a longitudinal direction; two or more magnetism detecting means (3a to 3p) arranged at the circumferencial direction of the wire rope; a comparator (6), an operation part (7). Said comparator specifies a magnetism detecting means of preset number and the said outputsignal value was beforehand determined to descending for both sides of a longitudinal direction of said wire rope, and a hoop direction. Said operation part calculates a fracture position of a steel wire based on the output signal value of a magnetism detecting means arranged in a magnetism detecting means with said largest output signal value, and its neighbors. The damage degree of said wire rope is judged based on the sum of each output signal value which multiplied by a coefficient according to distance of these each magnetism detecting means and fracture positions of said steel wire, andby which the coefficient concerned was able to multiply. Therefore the damage degree of said wire rope is accurately judged independent of the fracture positions of said steel wire.

Description

technical field [0001] The present invention relates to a flaw detection device for a steel wire rope, and in particular to a calculation unit in a flaw detection device that magnetizes a steel wire rope along its longitudinal direction and detects leakage magnetic flux from a damaged part by using a plurality of magnetic detection units arranged in the circumferential direction of the steel wire rope structure. Background technique [0002] Steel wire ropes used in elevators, hoists, cable cars, cranes, etc. are gradually broken due to fatigue and wear. This breaking amount increases with time, and when it exceeds a predetermined amount, it is judged that the service life has been reached and replacement is required. Therefore, it is necessary to measure the amount of wire breakage through regular inspections to evaluate whether the wire rope can be used safely. [0003] Conventionally, as a method of checking the breaking amount of a steel wire rope in use, visual ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/83
Inventor 浅井大辅长沼清
Owner HITACHI BUILDING SYST CO LTD