CN201503413U

CN201503413U - Sensor of magnetic flaw tester for wire ropes

Info

Publication number: CN201503413U
Application number: CN2009202097415U
Authority: CN
Inventors: 董信华; 杨鸿石; 何冬环
Original assignee: SHANGHAI QIEHUA VIRTUAL INSTRUMENT Co Ltd; SHANGHAI ERHUA DUMMY INSTRUMENT MANUFACTURE CO Ltd
Current assignee: SHANGHAI QIEHUA VIRTUAL INSTRUMENT Co Ltd; SHANGHAI ERHUA DUMMY INSTRUMENT MANUFACTURE CO Ltd
Priority date: 2009-09-16
Filing date: 2009-09-16
Publication date: 2010-06-09
Anticipated expiration: 2019-09-16

Abstract

A sensor of a magnetic flaw tester for wire ropes comprises a housing formed by a top baseplate, a compound plate and an end plate, wherein a guide sleeve allowing a steel wire rope to pass through is arranged in the housing, a pair of left permanent magnet steels and a pair of right permanent magnet steels which are connected through an armature are mounted on the outer wall of the guide sleeve, members forming the housing are made of ferromagnetic materials, and the top baseplate is in close fit and contact with the armature; and an aggregate spacer made of pure iron is embedded in the inner wall of the guide sleeve, a magnetic sensitive element is embedded in the aggregate hafu ring. By adopting the top baseplate made of ferromagnetic materials, certain functions of the armature are replaced,; the aggregate hafu ring made of pure iron is embedded in the inner wall of the guide sleeve to be close to a tested steel wire rope directly and to maximally collect signals generated by the leakage of a magnet and the change of magnetic flux due to the defect of a lead-in steel wire rope; and the magnetic sensitive element is embedded in the aggregate hafu ring to obtain better magnetic induction signals. The sensor can be used in the environment with explosive gas in the industries such as coal mine, petroleum and the like.

Description

The sensor of wire rope magnetic flaw detector

[technical field]

The utility model relates to the Non-Destructive Testing detector device, specifically, is a kind of sensor of wire rope magnetic flaw detector.

[background technology]

The appearance of wire rope electromagnetic nondestructive device has more than 100 year history, develops so far, and the technical method of the wire rope magnetic flaw detector of various models is similar substantially, is made up of sensor and processor two big critical pieces.The basic structure of sensor and principle of work are seen shown in Figure 1: the left and right sides permanent-magnet steel 01 in the sensor links by armature 02, when wire rope 00 passes through sensor, make wire rope 00 magnetization and reach capacity, form magnetic line of force trend and be the magnetic loop of the N utmost point → armature → S utmost point → wire rope → N utmost point, by be looped around around the wire rope magneto sensor 03 (Hall element) detection magnetic loop signal.The leakage field that defectives such as the fracture of wire of wire rope 00, corrosion, wearing and tearing, sectional area variation produce and the signal of magnetic flux change are received and output by magneto sensor 03.

Existing wire rope magnetic flaw detector sensor realizes that the said structure principle is to adopt following technological means:

The good armature of magnetoconductivity that one, enough volumes must be arranged, can make wire rope reach magnetically saturated magnetic field to guarantee that permanent-magnet steel, wire rope and armature form to reach, be subjected under the condition of shell restriction in length and width, the armature of use is generally thicker, and sensor is heavier.

Two, in order to guarantee and avoid the leakage field of defect in rope generation and the signal diffusion of flux change, formation is enough to make wire rope to reach magnetically saturated magnetic field, casing components such as the top board of sensor, base plate, compound plate and end plate adopt the nonferromagnetic material manufacturing, so existing similar products at home and abroad is usually selected alloy aluminum or plastics or nylon for use.

Three, for reducing the friction of tested wire rope in guide pin bushing, guide pin bushing adopts copper material, and all magnetic elements are as magnet steel, armature with have the periphery that Half ring is installed in guide pin bushing of gathering of Hall element.

For safety, standard GB 3836 and international standard eqv IEC 60079 " explosive gas atmosphere electrical installation " have special restriction to the sensor outer housing that adopts nonferromagnetic material manufacturings such as plastics, alloy aluminum in explosive gas atmosphere.Until now, the said goods both domestic and external can't use in industry explosive gas atmospheres such as colliery and oil.

[summary of the invention]

The utility model improves existing sensors, and it can be used in the explosive gas atmosphere of industries such as colliery, oil.

The technical solution of the utility model is: a kind of sensor of wire rope magnetic flaw detector, comprise the shell of forming by roof and floor, compound plate and end plate, have in the shell and hold the guide pin bushing that wire rope is walked, the guide pin bushing outer wall is equipped with the left and right two pairs of permanent-magnet steels that connected by armature, it is characterized in that: the member of forming shell is made by ferromagnetic material, and roof and floor wherein fits tightly with armature and contacts; One is gathered the inwall that Half ring is embedded in guide pin bushing by what pure iron was made, and magneto sensor is flush-mounted in and gathers in the Half ring.

The nonferromagnetic material that the utility model uses ferromagnetic material to substitute prior art is made the sensor outer housing of wire rope magnetic flaw detector, has avoided the restriction of standard GB 3836 and international standard eqvIEC 60079, can be easy to reach the regulation of above-mentioned standard.But leakage field and flux change signal that the shell of ferromagnetic material causes to external space diffusion defect in rope easily for this reason by way of compensation, reduce armature thickness in the prior art, substitute the effect of a part of armature with the roof and floor of ferromagnetic material; Make the inwall that gathers Half ring and be embedded in guide pin bushing with pure iron, directly press close to be examined wire rope, assemble importing leakage field and the flux change signal that defect in rope causes as much as possible; Magneto sensor is flush-mounted in and gathers in the Half ring, obtains magnetic induction signal preferably.

According to the above, the technical solution of the utility model can achieve the goal, and can use in the explosive gas atmosphere of industries such as colliery, oil.

[description of drawings]

Fig. 1 is the sensor General Principle figure of wire rope magnetic flaw detector.

Fig. 2 is the utility model example structure synoptic diagram.

Fig. 3 is guide pin bushing structure and a scheme of installation in the present embodiment.

Fig. 4 is an A-A sectional view among Fig. 3, expression magneto sensor and guide pin bushing annexation.

[embodiment]

Be described further below in conjunction with the utility model embodiment and accompanying drawing thereof.

See the sensor of the wire rope magnetic flaw detector shown in Fig. 2,3, shell 7 is by roof and floor 71, left and right sides compound plate 72 and front and back end plate 73 surround assembled up and down, top board 71 tops are equipped with the rocking arm 3 that handle 4 and coding ranging are used, have in the shell 7 and hold the guide pin bushing 2 that wire rope is walked, guide pin bushing 2 outer walls are equipped with the left and right two pairs of permanent-magnet steels 1 that connected by armature 5, member roof and floor 71, compound plate 72 and the end plate 73 of composition shell 7 and handle 4, rocking arm 3 are made by ferromagnetic material A3 steel, and roof and floor 71 wherein fits tightly with armature 5 and contacts; One is gathered the inwall that Half ring 6 is embedded in guide pin bushing 2 by what pure iron was made, and simultaneously referring to Fig. 4, magneto sensor 61 is flush-mounted in and gathers in the Half ring 6.Because ferromagnetic material shell 7, especially roof and floor 71 has the magnetic conduction effect, armature 5 thickness that present embodiment uses are half of original armature, sensor weight reduces a lot, but require the armature 5 and the surface of contact of roof and floor 71 must reach higher smooth finish, both can fit tightly, even roof and floor 71 can be designed to an one-piece construction with armature 5, and are integrally manufactured.

Claims

1. the sensor of a wire rope magnetic flaw detector, comprise the shell of forming by roof and floor, compound plate and end plate, have in the shell and hold the guide pin bushing that wire rope is walked, the guide pin bushing outer wall is equipped with the left and right two pairs of permanent-magnet steels that connected by armature, it is characterized in that: the member of forming shell is made by ferromagnetic material, and roof and floor wherein fits tightly with armature and contacts; One is gathered the inwall that Half ring is embedded in guide pin bushing by what pure iron was made, and magneto sensor is flush-mounted in and gathers in the Half ring.

2. the sensor of wire rope magnetic flaw detector according to claim 1 is characterized in that roof and floor and armature are an one-piece construction.