CN2190788Y

CN2190788Y - High sensitiveness sensor steel wire cable non-damage crack detector

Info

Publication number: CN2190788Y
Application number: CN 94209290
Authority: CN
Inventors: 窦毓棠
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-18
Filing date: 1994-04-18
Publication date: 1995-03-01
Anticipated expiration: 2004-04-18

Abstract

The utility model relates to a high sensitivity magnetic sensor steel wire cable non-damage crack detector, which is characterized in that the crack detector is provided with a probe body composed of a shielding cover (20), and a cylindric probe made of nonmetallic materials such as nylon, etc., the cylinder wall of the probe has a plurality of long wall grooves with a plurality of sensors, each end of the probe cylinder has four nylon beating seats and nylon wheel frames, the utility model also has an automatic control circuit box provided with a small bracket (14), a travel wheel (6), a following reed (15), and a travel digital magnetic disk (15). The utility model has the advantages of high sensitivity, strong antijamming performance, strong stability and reliability, and light weight, and is a multifunctional non-damage crack detector for steel wire cable.

Description

High sensitiveness sensor steel wire cable non-damage crack detector

The utility model relates to the pick-up unit of wire rope in lifting transportation and the pulling force transmission mechanical facility, a kind of high-sensitiivty magnetic sensor wire rope harmless flaw detector.

As time goes in various degree inside and surface corrosion, wearing and tearing and the inside and the surperficial fracture of wire that cause because of fatigue in use, can take place in wire rope, and the diameter drawing-down section that overload causes dwindles etc.These factors all cause dwindling of wire rope metal free area, reduce its load-bearing capacity, impel the wire rope easy fracture, effectively detect the waste of wire rope metal section in advance, for the generation that prevents rope-broken accident, very significant meaning are arranged.As far back as the beginning of this century, the scientific workers of some developed countries in the world, the wire-rope flaw detector that just begins one's study, year historical surplus in the of existing 90 so far.Since oneth century, many methods had been adopted in the world.As: ultrasound wave, infrared ray, radioactive ray, big electric current etc. all fail.Relatively think by scientific worker's experiment: the electromagnetic detection method is comparatively effective.China starts late, and since the sixties in this century, also adopts the electromagnetic detection method.It is Electromagnetic Dynamic inductive method and Hall (Hall) galvanomagnetic effect method.According to incompletely statistics, there are now more than 40 R﹠D institution of more than 20 country and company to be engaged in this device of development in the world approximately, and constantly put out a new product.Do not solve because detection by quantitative always, and promoted the use of.In recent years, China introduced the product of countries such as Japan, Germany, Britain, Switzerland respectively all owing to quantitatively inaccurate and too heavy, and reasons such as bad adaptability have been abandoned, do not add use.Domestic still employing manually detects by an unaided eye and uses hand-held cotton yarn to search situations such as wire rope surface fracture of wire, wearing and tearing, corrosion by the fracture of wire hanging wire, and for fear of rope-broken accident, generally adopts to shift to an earlier date the more way of change steel rope.According to incompletely statistics and since in advance more the waste that causes of change steel rope account for the 20%-25% of the total consumption in the whole world, be worth hundreds of millions yuan, the very surprising generation that can still can not avoid rope-broken accident.

The objective of the invention is: a kind of high-sensitiivty magnetic sensor wire rope harmless flaw detector is provided.Detection by quantitative goes out the various defectives that wire rope exists accurately and reliably.Be section waste △ s.Determine the serviceable life of wire rope, realize state-detection, rationally change and stop rope-broken accident and take place.

Described high-sensitiivty magnetic sensor steel rope flow detector has electronic automatic control circuit.Control circuit is loaded in Fig. 1 circuit box (13), the cylinder type probe body that is processed by nonmetallic materials such as nylon among Fig. 1.Also can adopt cast molding.Sensor (23) places the wall groove in the radome (20), and plurality of sensors is loaded on respectively and forms a probe in the nylon cylindrical wall groove.As same thick cyclinder, several elongated slots of processing on the barrel, respectively there are 4 nylon bearing seats at the cylinder two ends, are equipped with nylon wheel carrier (2) above, and the wheel carrier root is provided with jackscrew (21).The degree of tilt that the rotation jackscrew can be regulated angle sheave (3) makes upper and lower 8 angle sheaves embrace the wire rope of different-diameter gently, and angle sheave is made with the die casting of oil resistant abrasive rubber.Its effect is to guarantee wire rope all the time at probe endoporus central motion, and unlikely friction inwall constantly rolls along wire rope simultaneously.Small rack (14) and stroke wheel support (16) are housed, follower spring sheet (15), oil resistant abrasive rubber wheel (19) stroke digital disk (18) on the circuit box.When wire rope moves vertically, rub and rotate by rubber tire and wire rope.Sensor (26) sends the pulse of stroke coordinate by the magnetic sheet on the stroke wheel dial, to determine the position of detected impaired loci.The extension spring circular hole is equipped with extension spring in (22), and two up and down, by the constantan wire coiled.Extension spring two ends and two semicircular cylinder probes link.When with forefinger and middle finger pulling folding handle (9), two semicircular cylinders of popping one's head in are that axis opens with support (7), and finger unclamps the back and leans on the elastic force of spring to make two semi-closure.Snap in when wire rope is tested, deviate from very convenient.Hollow handle (10), aviation plug (25), multi-core controlled cable (24), the signal transmission between probe and MC microcomputer is formed by the cable of hollow handle on aviation plug jointly by tie and power lead.

The combined annular probe of described high-sensitiivty magnetic sensor wire rope harmless flaw detector is that several high-sensitiivty magnetic sensors are installed in the wall groove of cylinder, forms annulus.Cutting Fig. 1 open obtain Fig. 2 along A-A and look and resemble an annulus, is the transversal section of tested wire rope in the middle of the annulus.Each sensor is made up of two solenoid L1, L2.The vibration of high frequency vibration source E produces alternating source i1, and L1 connects with capacitor C 1 and constitutes resonant circuit.L2 is skew electromagnetism line chart.Change the resistance of potentiometer R, i2 changes, and the L2 ampere turns is changed, and the bias magnetic field HP that L2 produces changes.D3, D4 are isolating diodes.

The circuit working principle of sensor: L1 is high conducting magnet core coil and inductance thereof, and L2 is the skew solenoid, and H1 is the main leakage field from wire rope.When improving current potential when potentiometer changes resistance in the circuit, increase current i 2, the L2 ampere turns is increased, bias magnetic field HP strengthens, the L1 height is led iron core push critical saturation point to, in case the fracture of wire point on the wire rope moves to set sensor near point with wire rope at this moment, the local stray field △ h of fracture of wire point passes L1 iron core and HP addition; The height of L1 is led iron core push the saturation region to, make inductance L 1 weaken greatly, become L1min, its reactance XL1 becomes XL1min, and i1 is increased, and faint magnetic leakage signal becomes voltage ug, and Ug obtains the magnetic amplification; Simultaneously, L1 and c1 series connection constitute humorous loop again, and the vibration of high frequency source E has been satisfied the resonant condition of ω L1min=1/ ω c1 again when L1 becomes L1min, make △ h signal become Ug, and then ug obtains amplifying for the second time.△ h has the variation of 0.01Gs.Ug can reach the variation of 1v.Owing to adopted adjustable potentiometer, can change i2 electric current changing value by the hand-screw potentiometer, can also change the i2 value by computer search scanning, realized adjustability.The application result of bias magnetic field plays the effect that magnetic amplifies and improve sensitivity equally to fluxgate type sensor, uses very extensive.In addition under the cooperation of L2, the all right comprehensive a plurality of signals of L1, be about to the main leakage field H1 on wire rope surface, the magnetic that L1 itself produces is hindered H2, the magnetic-field component H3 that surrounding environment exists, the magnetic that L2 produces is hindered Hp, the fracture of wire corrosion is worn and torn and is waited the △ h that produces all comprehensively to arrive together, and promptly interlinkage together, realize associated adjustment, compensating non-linear is poor.Wire rope and its steel wire to different-diameter can both directly detect its amount of damage △ S or fracture of wire radical.

Experimental results show that: any high conducting magnet core coil, although the shape difference as long as connect the high frequency vibration source, is added bias magnetic field and is all possessed the magnetic amplification.If series capacitance can form resonance circuit again, as satisfy ω l=1/ ω c condition and can possess the resonance amplification again, and the effect of comprehensive a plurality of signals is arranged, form high-sensitiivty magnetic sensor.

The utility model high-sensitiivty magnetic sensor wire rope not damaged instrument has following advantage: the conversion of signal be with sensor this as the master, circuit is enlarged into auxilliary, so the signal to noise ratio (S/N ratio) height is highly sensitive, antijamming capability is strong, and is reliable and stable.The comprehensive a plurality of signals of sensor energy can be realized automatic associated adjustment and linear compensation, so the accuracy height can be realized detection by quantitative.Manual and the demarcation automatically of realization is convenient in the application of damaged area bias magnetic field Hp, and nonmetallic materials such as probe body structure employing nylon have alleviated the weight of instrument greatly, than the light 5-22.5 of similar products at home and abroad times.Can indicate the impaired loci coordinate again by detection by quantitative damage section, be a kind of Full Featured wire rope harmless flaw detector.And detection speed can be from the 0-9 meter per second.Occupy first of the existing defectoscope.Experimental results show that: alternative existing other the various defectoscopes of the appearance of this defectoscope, remove and can bring direct economic benefit, also be that society creates great riches.

Below in conjunction with the description of drawings specific embodiment:

Fig. 1: high-sensitiivty magnetic sensor wire rope nondestructive examination instrument probe overall schematic.

(1) main body framework: the bearing seat at two ends and main body framework are to hold in both hands material by a nylon to process.(2): the angle sheave support: upper and lower totally 8 make by nylon.(3) angle sheave is totally 8, is made by the oil resistant abrasive rubber.(4) wheel shaft, brass axle.(5) hinge bracket.(6) the hinge support is connected with two semicircular cylinders respectively.(7) brass support shaft.(8) nylon folding key.(9) nylon folding handle.(10) nylon hollow handle.(11) connector (nylon, below do not annotate material be nylon).(12) circuit lid.(13) circuit box.(14) ramuscule stand.(15) stroke wheel carrier.(16) follower spring (60si2mn).(17) stroke wheel shaft.(18) number of strokes may letter disk is equipped with the roundlet magnetic sheet above.(19) stroke wheel, rubber.(20) stainless steel shielding cover.(21) copper jackscrew is adjusted the angle sheave inclination angle, upper and lower totally 8.(22) extension spring hole, the extension spring of interior dress constantan wire, upper and lower two.(23) sensor, its extension line is drawn out to (24) polycore cable from circular hole.(25) aviation plug.(26) stroke sensor.(27) the side-looking wall groove on the semicircular cylinder skeleton.

The B-B view is the vertical view of Fig. 1

Fig. 2: the combined annular probe skeleton synoptic diagram of high-sensitiivty magnetic sensor wire rope nondestructive examination instrument probe inside.(28) hole.(29) strand wire.(30) hemp center.

Fig. 3: high-sensitiivty magnetic sensor circuit working schematic diagram

The MC-microcomputer; The L1-height is led iron core sensing coil and inductance thereof; The L2-solenoid; The E-oscillation source; The Hp-bias magnetic field; The DC current that i2-direct supply and microcomputer provide through potentiometer and isolating diode D3 or isolating diode D4 respectively; Cl-electric capacity; △ h-impaired loci stray field; The main field of H1-wire rope (stray field); The Ug-signal voltage; △ s-damaged area.ω-angular frequency=2 π f.

The probe physical construction all be workpiece, by other part figure process qualified after, be assembled by total figure.Circuit part is made printed panel and is packed in the circuit box.Cabling is by the line hole between the wall groove, passes from the macropore between the angle sheave of probe upper end at last, enters into circuit box through plastic tube, then through the hollow handle to aviation plug, connect the flat plug of 25 cores through cable again, connect with microcomputer, after microcomputer MC handles, file by micro-printer printout paper tape.Potentiometer R is contained in to be convenient on the circuit box cover plate adjust.Each road sensor pilot lamp is housed on the circuit box panel, in testing process,, therefore generally can be with COMPUTER DETECTION at every turn for new wire rope according to the quantity and the time discovery wire rope sectional area extent of deterioration of pilot lamp flicker.Only probe is mixed battery and just can detect, and sound and light alarm is arranged.

Claims

1, a kind of high-sensitiivty magnetic sensor wire rope harmless flaw detector, it is made up of the automatic control circuit and the cylinder type probe body of a device in circuit box, of the present utility model being characterised in that, the cylinder type probe that described probe body has a radome (20) and processed by nonmetallic materials such as nylon, the a plurality of longwell grooves of processing on the barrel, device has a sensor in each wall groove, respectively there are four nylon bearing seats at the cylinder two ends, be equipped with the nylon wheel carrier above, the wheel carrier root is provided with jackscrew (21), small rack (14) and stroke wheel support (16) is housed, follower spring sheet (15) on the circuit box, wear-resistance and oil-resistance rubber wheel (19), stroke digital disk (18).

2, high-sensitiivty magnetic sensor wire rope harmless flaw detector as claimed in claim 1, it is characterized in that: the sensor in each wall groove of described probe inner cylinder, each is made up of its each sensor two solenoid L1, L2, high-frequency agitation source E vibration produces alternating source i1, L1 connects with capacitor C 1 and constitutes resonant circuit, L2 is for being offset solenoid to realize adjustability, R is a potentiometer, 12 change in resistance with R, the ampere turns of L2 changes, and D3, D4 realize manual adjustments and self-regulating isolating diode.

3, the sensor of high-sensitiivty magnetic sensor wire rope harmless flaw detector as claimed in claim 2, it is characterized in that: the coil of described sensor is that L1 and L2 solenoid two ends can connect the oval iron core of formation with high conducting magnet core, two oval long limits are coiling L1 and L2 respectively, also can be respectively around 1/2 of total number of turns on two long limits of oval iron core, L1, L2 are being grown on the limit respectively around 1/2 of total number of turns, and then centering on two long limit iron cores around a L3, L3 one end ground connection, the other end is connected with C1.L1 one end is by vibration source ground connection, and the other end is ground connection also.

4, high-sensitiivty magnetic sensor wire rope harmless flaw detector as claimed in claim 1, it is characterized in that: described wire rope harmless flaw detector also has nylon folding handle (9), nylon folding key (8) hinge support (5), brass support shaft (7), hinge support are connected with two halves probe cylinder respectively.