CN2205557Y

CN2205557Y - Automatic vertex crack detector for steel pipe

Info

Publication number: CN2205557Y
Application number: CN 94229083
Authority: CN
Inventors: 张永和; 王晏齐; 丁丕显; 杨培有; 王仲初
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-07
Filing date: 1994-07-07
Publication date: 1995-08-16
Anticipated expiration: 2004-07-07

Abstract

The utility model relates to an automatic vortex crack detector for steel pipes, belonging to an automatic vortex crack detector suitable for the on-line or off-line crack detection of high-frequency welded pipes and seamless steel pipes. The utility model is composed of a machine body, a probe adjusting wheel, combined probes, a speed measuring wheel, etc. The utility model is controlled by a computer, and uses a probe following and rotating device, a crack detecting speed autotracking device, and three types of combined probes. The utility model has the advantages that the on-line or off-line crack detection of the steel pipes can be realized, the defect detecting rate of steel pipes can be enhanced, the false reporting rate can be efficiently lowered, and the long crack defects and the strip-shaped defects can be recognized and marked out.

Description

Automatic vertex crack detector for steel pipe

The utility model is a kind ofly to be applicable to ratio-frequency welded tube and weldless steel tube is online or the automatic eddy current testing equipment of the automatic eddy current inspection equipment-steel pipe of off-line.

At present, the online or off-line flaw detection of ratio-frequency welded tube and weldless steel tube, the defect-detecting equipment that adopts fixed electric current magnetic saturation device and probe to form, making steel pipe reach magnetic saturation by direct current supply by coil detects a flaw, its equipment is huge, and probe can not servo-actuated, and the flaw detection quality is low.

The purpose of this utility model is to provide a kind of online or off-line to carry out the automatic eddy current testing equipment of equipment-steel pipe that nondestructive examination detects for producing ratio-frequency welded tube and weldless steel tube.

The automatic eddy current testing equipment content Description of the utility model steel pipe:

The automatic eddy current testing equipment of the utility model steel pipe is by body, probe lift adjustment handwheel, adjust handwheel before and after the probe, the follower hanging scaffold, the rotating detector handwheel, the V-arrangement locating wheel, coupling probe, fifth wheel, follower spring, the follower gear frame, hanger bolt, compositions such as computer eddy current flaw detec, computer is introduced eddy current flaw detec, excitation by computer control defectoscope, receive, amplify, filtering, phase demodulation, the zero potential self-poise, speed is from motion tracking, report to the police, hinder mark, the record inspection speed, it is characterized in that: adopt probe servo-actuated and wheelwork, be to be connected with four hanger bolts by the follower hanging scaffold, by four follower springs with the follower gear frame and be fixed on two V-arrangement locating wheels at tooth rest two ends, coupling probe hangs up, contact with steel pipe by the V-arrangement locating wheel, when steel pipe fluctuateed, probe servo-actuated and wheelwork were by follower spring and steel pipe synchronization fluctuate; The inspection speed autotracker is to gather the steel pipe movement velocity by the side speed wheel that is fixed on the follower gear frame, and imports the computer eddy current flaw detec, reconciles frequency filtering automatically, thereby can eliminate the influence of inspection speed to flaw detection sensitivity; Adopt the coupling probe of three kinds of forms in the automatic eddy current testing equipment of steel pipe, i.e. (1) fan-shaped coupling probe, be by a rectangular parallelepiped shell, its bottom is screwed a rectangular magnetic conductive board, a square Nd-Fe-B permanent magnet is respectively installed at two of magnetic conductive board, fan-shaped eddy current probe is adsorbed on the middle part of magnetic conductive board by the soft iron plate top cover at its top, separate with two magnetic pole pieces, non magnetic dividing plate and magnetic conductive board two are attached together and form a yoke, can be to steel pipe magnetize saturation, in two fan-shaped circular arcs of shell body end opening, place a fan-shaped nylon jacket, coupling probe is closed; (2) normal temperature through mode coupling probe, form by probe with the magnetic saturation support that neodymium iron boron is inlayed, two groups of neodymium iron borons constitute complete magnetic pole by the magnetic conduction cylinder, probe and probe bracket keep the homogeneity of magnetic at the middle chien shih steel pipe of magnetic conduction cylinder itself, the pressure roller centralising device is installed on the coupling probe shell, and coupling probe is installed in the casing that has spring; (3) structure of high temperature through mode coupling probe is identical with normal temperature through mode coupling probe, just at the interior cover place of coupling probe by a circulation cooling water storehouse of forming by stainless steel band, coupling probe is detected a flaw at normal temperatures.

The automatic eddy current testing equipment of the utility model steel pipe can to ratio-frequency welded tube and weldless steel tube be online or the off-line flaw detection, can improve the steel tube defect recall rate, reduces rate of false alarm effectively, and can discern and mark long rift defect and strip defective.

Embodiment:

Fig. 1 is the automatic eddy current testing equipment structure of a steel pipe front elevation;

Fig. 2 is the automatic eddy current testing equipment structure side of a steel pipe view;

Fig. 3 is fan-shaped coupling probe structural drawing;

Fig. 4 is normal temperature (high temperature) through mode coupling probe structural drawing;

See Fig. 1, Fig. 2, the 1st, body, adjust handwheel 3 before and after at first adjusting probe lift adjustment handwheel 2 and probe during flaw detection, make V-type locating wheel 6 correctly drop on the steel pipe, keep certain distance with probe 7, adjust rotating detector handwheel 5 rotation probes 7 according to the position of weld seam in producing and align with weld seam, probe can be adjusted in 60 ° of scopes on the welded tube circumference.Coupling probe 7 by follower spring 9 can with the steel pipe synchronization fluctuate, thereby eliminate the influence of Lift-off effect, probe sensitivity is remained unchanged.Gather the steel pipe movement velocity by fifth wheel 8, and import computer eddy current flaw detec 12, regulate frequency filtering automatically, thereby can eliminate the influence of inspection speed flaw detection sensitivity.Probe servo-actuated and wheelwork, be to be connected with four hanger bolts 11 by follower hanging scaffold 4, by four follower springs 9 follower gear frame 10 and two the V-arrangement locating wheels 6, the coupling probe 7 that are fixed on the tooth rest two ends are hung up, contact with steel pipe by V-arrangement locating wheel 6, when steel pipe fluctuateed, probe servo-actuated and wheelwork were by follower spring 9 and steel pipe synchronization fluctuate.Coupling probe 7 has three kinds of forms, i.e. (1) fan-shaped coupling probe (Fig. 3), be by a rectangular parallelepiped shell 14, its bottom is screwed a rectangular magnetic conductive board 15, a foursquare Nd-Fe-B permanent magnet 16 is respectively installed at two of magnetic conductive board 15, fan-shaped eddy current probe 13 is adsorbed on the middle part of magnetic conductive board by the soft iron plate top cover at its top, separate with two magnetic pole pieces 18, non magnetic dividing plate 17 is attached together with magnetic conductive board 15 two and forms a yoke, can be to steel pipe magnetize saturation, in two fan-shaped circular arcs of shell body 14 end openings, place a fan-shaped nylon jacket 19, coupling probe is closed; (2) normal temperature through mode coupling probe (Fig. 4) is formed by probe 21 with the magnetic saturation support 25 that neodymium iron boron 28 is inlayed, and two groups of neodymium iron borons 28 constitute complete magnetic pole by magnetic conduction cylinder 20, make steel pipe reach magnetic saturation.Probe 21 and probe bracket 26 make steel pipe itself keep the homogeneity of magnetic in the centre of magnetic conduction cylinder 20.Keep with one heart when making steel pipe pass through coupling probe, but 23 automatic centerings of pressure roller centralising device are housed on the coupling probe shell 24.For making coupling probe 21 keep synchronization fluctuate with steel pipe, thereby eliminate the influence of Lift-off effect, coupling probe 21 is installed in the casing 22 that has spring 27; (3) structure of high temperature through mode probe is identical with normal temperature through mode probe, just at the interior cover place of coupling probe 21 by a circulation cooling water storehouse 29 of forming by stainless steel band, coupling probe is remained under the normal temperature detects a flaw.

Claims

1, the automatic eddy current testing equipment of a kind of steel pipe, be by body, probe lift adjustment handwheel, adjust handwheel before and after the probe, the follower hanging scaffold, the rotating detector handwheel, the V-arrangement locating wheel, coupling probe, fifth wheel, follower spring, the follower gear frame, hanger bolt, compositions such as computer eddy current flaw detec, computer is introduced eddy current flaw detec, excitation by computer control defectoscope, receive, amplify, filtering, phase demodulation, the zero potential self-poise, speed is from motion tracking, report to the police, hinder mark, the record inspection speed, it is characterized in that: adopt probe servo-actuated and wheelwork, be to be connected with four hanger bolts by the follower hanging scaffold, by four follower springs with the follower gear frame and be fixed on two V-arrangement locating wheels at tooth rest two ends, coupling probe hangs up, and is contacted with steel pipe by the V-arrangement locating wheel; The inspection speed autotracker is to gather the steel pipe movement velocity by the side speed wheel that is fixed on the follower gear frame, and imports the computer eddy current flaw detec; In the automatic eddy current testing equipment of steel pipe, adopt the coupling probe of three kinds of forms, i.e. (1) fan-shaped coupling probe, be by a rectangular parallelepiped shell, its bottom is screwed a rectangular magnetic conductive board, a square Nd-Fe-B permanent magnet is respectively installed at two of magnetic conductive board, fan-shaped eddy current probe is adsorbed on the middle part of magnetic conductive board by the soft iron plate top cover at its top, separate with two magnetic pole pieces, non magnetic dividing plate and magnetic conductive board two are attached together and form a yoke, in two fan-shaped circular arcs of shell body end opening, place a fan-shaped nylon jacket, coupling probe is closed; (2) normal temperature through mode coupling probe, form by probe with the magnetic saturation support that neodymium iron boron is inlayed, two groups of neodymium iron borons constitute complete magnetic pole by the magnetic conduction cylinder, probe and probe bracket keep the homogeneity of magnetic at the middle chien shih steel pipe of magnetic conduction cylinder itself, the pressure roller centralising device is housed on the coupling probe shell, and coupling probe is installed in the casing that has spring; (3) structure of high temperature through mode coupling probe is identical with normal temperature through mode coupling probe, just at the interior cover place of coupling probe by a circulation cooling water storehouse of forming by stainless steel band.