CN2157517Y

CN2157517Y - Wire rope flaw detector

Info

Publication number: CN2157517Y
Application number: CN 93217598
Authority: CN
Inventors: 张德万; 韩文彬; 刘贵才; 张清华; 王永贵; 胡立志
Original assignee: 韩文彬
Priority date: 1993-07-09
Filing date: 1993-07-09
Publication date: 1994-02-23
Anticipated expiration: 2003-07-09

Abstract

The utility model relates to a wire rope flaw detector which is mainly composed of a detecting head and a display instrument and is designed according to the principle of a circuit flaw detecting method. The detecting head is provided with a permanent magnet of high magnetic field intensity, and a sensor. The display instrument is provided with a local flaw detecting circuit, a cross section loss detecting circuit, a storing and memorizing circuit, an acoustic and optic signal control circuit and a printer. The utility model can detect the local defects of the surfaces of the wire ropes and the internal defects and can detect under dynamic condition.

Description

Wire rope flaw detector

The utility model relates to a kind of steel rope flow detector, especially a kind of magnetic crack detector.

Existing wire rope detection method, the overwhelming majority adopts examination---visual method and the diameter measurement method of wiping.These two kinds of methods all can only detect the defective on the wire rope outside surface, can not detect the wire rope inherent vice.And be under wire rope is in static state, to detect, can not in its operate as normal, detect.

The purpose of this utility model provides and a kind ofly can detect the wire rope appearance defect, can detect internal defects again, both can detect under wire rope is in static state, also can be at the steel rope flow detector that dynamically detects down.

The purpose of this utility model is achieved in that by detecting head and display instrument two parts forms defectoscope.Detecting head partly comprises two groups of magnetic poles, be installed in the two ends of detecting head respectively, every group of magnetic pole has 6, is star-arrangement around the magnetic boots, the magnetic boots are that an outside is hexagon and inner hollow cylinder for circle, and the outside of magnetic pole is separately fixed on corresponding 6 blocks of magnetic conductance plates.At the middle part of two blocks of relative magnetic conductance plates one group of sensor is housed respectively.Detecting head be can deciliter the two halves of symmetry, be separately fixed on the shell of detecting head, one side of two housing sections is linked to each other by hinge, is convenient to deciliter.Four guide wheels are housed altogether, so that cable wire by probe, does not also have counter to measure the length of cable wire on a guide wheel therein on the detecting head shell.The display instrument part is made up of local defect testing circuit, section loss testing circuit, storing memory circuit, sound and light signal control circuit and printer, is contained in the housing altogether.Be provided with on display board that local defect indicator gauge, electronic digital percentages show device, testing result printing are strong, the long-pending defective indicator gauge of cross section metal and function adjusting knob.Between detecting head and display instrument, link to each other by cable.

Defectoscope of the present utility model can detect the appearance defect of wire rope, can detect internal defects again, and can dynamically detect down.Because automatic measurement length device has been installed on detecting head, it can accurately measure tested rope capacity and accurate recording defective locations.This defectoscope also has advantages such as volume is little, in light weight, easy to operate, sensitivity height.

Describe the utility model in detail below in conjunction with accompanying drawing.

Fig. 1 is the utility model steel rope flow detector structural representation;

Fig. 2 detects schematic diagram;

Fig. 3 is the leakage flux synoptic diagram;

Fig. 4 detects the long-pending loss of cross section metal schematic diagram;

Fig. 5 detects the head synoptic diagram;

Fig. 6 is a wire rope local defect detection system circuit block diagram;

Fig. 7 is the long-pending defect detecting system circuit block diagram of wire rope cross section metal;

Fig. 8 is the cross sectional representation of magnetic boots.

Referring to Fig. 5, detecting head partly is the two halves of symmetry, comprises two groups of magnetic poles 1.Be installed in the two ends of detecting head respectively, every group of magnetic pole has six, is shape and is arranged in around the magnetic boots 2.Connect by magnetic conductance plate 3 between two magnetic poles, to form magnetic loop.Be separately installed with one group of sensor 5 that detects the sensor 4 of leakage field energy variation and detect magnetic resistance change rate at the middle part of two magnetic conductance plates that inspection is put.Magnetic boots 2 are the inner hollow cylinder (Fig. 8) for circle of hexagon for the outside.Tested wire rope 6 can pass through from the detecting head middle part.Magnetic pole 1 is rare thorium permanent magnet, and its magnetic field intensity is more than 3500 Gausses.

As shown in Figure 1, two parts of detecting head are separately fixed on the shell 7, and one side of two housing sections is linked to each other by hinge 9, also is provided with handle 8 on shell.Connect on the detecting head shell 7 four cable wire guide wheels 17 are housed altogether, so that cable wire also is provided with rope length counter 18 on a guide wheel therein by probe.

The display instrument part is made up of display board and housing 16, is provided with local defect indicator gauge 11, electronic digital percentages show device 12, testing result printing key 13, the long-pending defective indicator gauge 14 of cross section metal and multiple function adjusting knob 15 on display board.Local defect detection system circuit and sectional area defect detecting system circuit are housed in the inside of housing, and storing memory circuit, sound and light signal control circuit computing machine and printer.Connect by cable 10 between detecting head and the display instrument.

As shown in Figure 2, when wire rope 6 passed through detecting head, its tested part was in the high magnetized magnetic field, and sensor 4 and sensor 5 are experienced the tested part of cable wire respectively in magnetic field leakage flux changes and magnetic resistance change rate.

As shown in Figure 3, after cable wire 6 tested parts are by saturated magnetization, in local defect position 19(for example fracture of wire, etch pit or mechanical damage) two the different magnetic pole of bipolarity can appear, the magnetic loop of this opposite pole is different with main pole magnetic loop direction, is referred to as leakage flux 20.Sensor 4 converts thereof into electric signal after detecting leakage flux, just can obtain a detection signal relevant with the wire rope local defect through processing of circuit again, according to the various signs of detection signal, can judge the size that has or not local defect and defective.

As shown in Figure 4, it is the equivalent circuit diagram of Fig. 2, wherein represents the voltage on the E sensor, and this voltage is represented the magnetic potential in the magnetic loop.Electric current I is first magnetic flux, represents the magnetization magnetic flux of magnetic loop, and IoPP is second magnetic flux, represents the counter magnetic flux amount.R represents the magnetic resistance of wire rope self, and Rg represents the magnetic resistance in the space between pole magnetization and the wire rope.Ammeter A represents the magnetic induction sensor 5 in the loop.When having the long-pending loss of cross section metal to exist on the cable wire, then the magnetic resistance R of cable wire changes, and the variation of R causes the equivalent electrical circuit out of trim, just can obtain one from sensor 5 and amass with cross section metal and to lose the relevant detection signal of defective.The power of signal is directly proportional with the large and small of section loss defective.

As shown in Figure 6, wherein S is the simplified electrical circuit diagram of detection head, and its detected wire rope local defect signal is defeated by signal display apparatus after filtering, detection and electric current amplify.Oscillator shown in other square frame, power amplifier, phase-shifter, phase locking unit, frequency divider, frequency selector etc. can provide a stable frequency of operation for detection signal, so that detect.

Fig. 7 is the long-pending defect detecting system circuit block diagram of wire rope cross section metal, and each several part circuit function is identical with Fig. 6, has just increased zero-bit adjustment and hand control part, and to adjust because of tested wirerope diameter difference, the signal that magnetic resistance R difference causes shows indeterminate.

Claims

1, a kind of steel rope flow detector, form by detecting head and display instrument two parts, it is characterized in that detecting head partly comprises two groups of magnetic poles (1), be installed in the two ends of detecting head respectively, every group of magnetic pole has 6, be star-arrangement on every side at magnetic boots (2), magnetic boots (2) are that an outside is hexagon and inner hollow cylinder for circle, the outside of magnetic pole is separately fixed on corresponding six blocks of magnetic conductance plates (3), at the middle part of opposed two blocks of magnetic conductance plates one group of sensor (4 is housed respectively, 5), detecting head be can deciliter the two halves of symmetry, be separately fixed on the shell (7) of detecting head, one side of two housing sections is linked to each other by hinge (9), be convenient to deciliter, the display instrument part is by the local defect testing circuit, the section loss testing circuit, the storing memory circuit, sound and light signal control circuit and printer composition are contained in the housing (16) altogether, on display board, be provided with local defect indicator gauge (11), electronic digital percentages show device (12), (13) are good in the testing result printing, long-pending defective indicator gauge (14) of cross section metal and function adjusting knob (15) are linked to each other by cable (10) between detecting head and display instrument.

2, steel rope flow detector as claimed in claim 1 is characterized in that magnetic pole (1) is rare thorium permanent magnet, and magnetic field intensity is more than 3500 Gausses.

3, steel rope flow detector as claimed in claim 1 is characterized in that four guide wheels (17) are housed on the detecting head shell (7), so that cable wire is by detecting head, guide wheel is provided with a counter of measuring rope length therein simultaneously.