CN109425652B

CN109425652B - Steel pipe flaw detection method

Info

Publication number: CN109425652B
Application number: CN201710734708.3A
Authority: CN
Inventors: 吴建军; 周红波; 赵伟
Original assignee: Chongqing Iron & Steel Institute Co ltd
Current assignee: CHONGQING IRON & STEEL INSTITUTE Co.,Ltd.
Priority date: 2017-08-24
Filing date: 2017-08-24
Publication date: 2021-09-07
Anticipated expiration: 2037-08-24
Also published as: CN109425652A

Abstract

The invention discloses a steel pipe flaw detection method, which adopts a probe arranged near the surface of a steel pipe to realize steel pipe flaw detection. The invention has the advantages of simple implementation, capability of improving the flaw detection area and the flaw detection efficiency, avoidance of missed detection and improvement of flaw detection reliability.

Description

Steel pipe flaw detection method

Technical Field

The invention relates to a flaw detection technology for steel pipe surface defects; in particular to a steel pipe flaw detection method.

Background

The steel pipe is an important steel material which is widely applied, and the wall of the steel pipe has defects of longitudinal cracks, transverse cracks, folding, layering and the like due to the influence of various factors in the production process of the steel pipe. If the steel pipe is defective, the steel pipe can be broken in use to cause accidents, even serious consequences, and possibly cause heavy economic loss and even casualties. In order to ensure the quality of the steel pipe leaving the factory, the existing flaw detection methods mainly comprise ultrasonic flaw detection and eddy current flaw detection methods. The existing steel pipe flaw detection line usually uses ultrasonic flaw detection and eddy current flaw detection as independent operation systems, but two kinds of detection are often required to be completed along with the improvement of the existing steel pipe detection requirements, at the moment, an operator is required to discharge the steel pipe subjected to one kind of flaw detection and then transfer the steel pipe to the next flaw detection, and the defects of repeated work, high labor intensity, long inspection operation period and low efficiency exist, so that the flaw detection line becomes a factor for limiting the flaw detection speed of the steel pipe.

In the existing steel pipe flaw detection equipment, no matter import equipment or domestic equipment, a natural pipe can enter a flaw detection link after being rolled and formed. The surface of the rolled steel pipe is inevitably subjected to improper conveying and placing, stress aging deformation of the rolled steel pipe, or influence of external factors and the like, which cause deformation of the rolled steel pipe before flaw detection, if the rolled steel pipe is not timely treated, the deformed steel pipe has influence on flaw detection effect due to poor straightness or surface quality, and the stability of flaw detection cannot be ensured. If not cleaned in time, the flaw detection is greatly influenced, serious interference is generated in the flaw detection process, and even false alarm and even report missing can be generated.

Meanwhile, the ultrasonic automatic flaw detector is widely used in the flaw detection industry of steel pipe parts by ultrasonic detection, for example, in the automatic flaw detector for steel pipe parts. The existing online ultrasonic flaw detection of steel pipes generally adopts a probe water film coupling method to carry out online flaw detection. When automatic ultrasonic flaw detection is performed on a steel pipe, a probe is generally pressed on the outer surface of the steel pipe at a certain distance by a certain mechanical mechanism, a certain gap is reserved between the probe and the steel pipe by adjusting an adjusting system on a probe frame, water is filled to form a coupling water film, and flaw detection is performed by means of ultrasonic emission. In the actual automatic flaw detection process, because the steel pipe is in the transmission process of detection, the probe of the existing ultrasonic automatic flaw detection device is usually directly fixed on the probe support, and the probe support is fixedly connected with the flaw detection water tank, because the steel pipe models are more, the probes are fixedly arranged, and the flaw detection requirements of the steel pipes with different models cannot be met. Meanwhile, in the flaw detection process of the steel pipe, when the flaw position of the steel pipe passes through, the steel pipe is easy to touch the probe to cause the vibration and tilting of the probe, so that the amplitude of a flaw signal changes, and if the flaw detection cannot be timely adjusted, the reliability and accuracy of flaw detection can be influenced. The same problem also exists with eddy current testing.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a steel pipe flaw detection method which is simple to implement, can improve the flaw detection area and the flaw detection efficiency, avoids missed detection and improves the flaw detection reliability.

In order to solve the technical problems, the invention adopts the following technical scheme:

a steel pipe flaw detection method is characterized in that the flaw detection of the surface of a steel pipe is realized in a mode that a probe is fixed and the steel pipe advances spirally.

Like this, the mode of steel pipe with rotatory marcing for the scope of detecting a flaw of probe is bigger among the steel pipe flaw detection device, can rely on fixed probe to realize the ascending flaw detection of steel pipe circumference, avoids lou examining better, has strengthened the reliability and the stability of detecting a flaw, makes to rely on less probe to realize better effect of detecting a flaw.

The method is optimized by adopting the following steel pipe flaw detection system, wherein the steel pipe flaw detection system comprises a steel pipe transmission device for driving a steel pipe to move along the axis direction and a steel pipe flaw detection device arranged on the moving path of the steel pipe; the steel pipe flaw detection device comprises a detection box, wherein through holes are respectively formed in side plates of the front side and the rear side of the detection box along the advancing direction of a steel pipe, a set of flaw detection mechanism is respectively installed on the side plates of the front side and the rear side of the detection box, the flaw detection mechanism is provided with a flaw detection probe positioned in the detection box, the flaw detection probe is fixed at the lower end of a vertically arranged adjusting rod, the upper end of the adjusting rod is installed on the side plate of the detection box, and the probes of the two flaw detection mechanisms are respectively positioned on two sides of the advancing path of the steel pipe;

the steel pipe transmission device comprises a steel pipe advancing mechanism for driving the steel pipe to advance along the axis and a steel pipe rotating mechanism for driving the steel pipe to rotate by taking the axis as the center.

Therefore, in the steel pipe flaw detection device, the probes are arranged on the left and the right respectively, flaw detection is carried out in a mode that the probes are fixed and the steel pipe moves forwards, the full-surface flaw detection of the steel pipe can be well realized by a simpler structure, the flaw detection efficiency is improved, the missing detection is avoided, and the flaw detection reliability is improved. Furthermore, the steel pipe transmission device is used for driving the steel pipe to advance spirally, and the mode of spirally advancing the steel pipe is matched, so that the flaw detection area can be better increased, and the flaw detection efficiency is improved.

Furthermore, the steel pipe flaw detection devices are two arranged at intervals along the advancing direction of the steel pipe, the probe in one steel pipe flaw detection device is an ultrasonic detection probe and forms an ultrasonic steel pipe flaw detection device, and the probe in the other steel pipe flaw detection device is an eddy current detection probe; in the steel pipe flaw detection device with the ultrasonic detection probe, a flexible sliding sleeve which is matched with a steel pipe to form dynamic seal is arranged in a through hole of a detection box, detection liquid is filled in the detection box to realize ultrasonic water film method flaw detection, and the lower end of the detection box is arranged in a detection liquid recovery container.

Therefore, the ultrasonic water film method flaw detection is combined with eddy current flaw detection, and the two flaw detection modes are combined, so that the missed detection is effectively avoided, and the flaw detection accuracy and reliability are further improved. Furthermore, the inner ring wall of the flexible sliding sleeve is provided with a lip made of a circle of flexible plastic, and the lip is used for being in contact with the surface of the steel pipe to realize dynamic sealing.

Furthermore, in the steel pipe flaw detection device provided with the ultrasonic detection probe, a glass observation window is also arranged on the side surface of the detection box; the liquid level position of the detection liquid can be observed conveniently. Still further, set up vertical scale mark on the glass observation window, can conveniently acquire the liquid level position of position accurately and guarantee the effect of detecting a flaw.

Further, in the steel pipe flaw detection device provided with the ultrasonic detection probe, a liquid inlet pipeline is arranged above the detection box, a liquid heating container is arranged above the liquid inlet pipeline, and the liquid heating container is connected with a detection liquid recovery container through a water pump and a backflow pipeline.

Thus, the recycling of the detection liquid can be realized. And more importantly, in the method, the operating method that the detection liquid is heated by the liquid heating container and then flows back into the detection box for steel pipe flaw detection is adopted, so that micro bubbles in the detection liquid can be well eliminated, the influence on the detection effect caused by the existence and generation of the micro bubbles in the detection liquid in the detection box is greatly avoided, meanwhile, the steel pipe is further combined to advance in a rotating mode, bubbles on the surface of the steel pipe can be prevented from adhering to the steel pipe by means of rotation of the steel pipe, and the flaw detection accuracy is greatly improved.

Furthermore, in the steel pipe flaw detection device provided with the ultrasonic detection probe, one side above the detection box is provided with an overflow groove, the overflow side of the overflow groove is connected with the inner cavity of the detection box, and the lower end of the liquid inlet pipeline is arranged in the overflow groove. Therefore, the overflow of the overflow groove can be relied on, the fluctuation of the liquid level in the detection box can be better avoided, and the generation of bubbles can be better avoided, so that the better detection effect can be ensured.

Preferably, the detection box side plate is further provided with a probe adjusting device, the probe adjusting device comprises a translational adjusting mechanism, the translational adjusting mechanism comprises a hanging plate which is vertically arranged and fixed above the detection box side plate, the inner side surface of the hanging plate is provided with a translational base plate along the vertical attaching direction, the outer side of the translational base plate is provided with an outward translational bulge, the translational bulge is horizontally matched with a horizontal sliding groove in a limiting manner by the translational bulge in a horizontal sliding manner, the translational adjusting mechanism further comprises a translational adjusting screw rod, the translational adjusting screw rod is parallel to the vertical plane where the corresponding side plate is located and horizontally arranged, the inner end of the translational adjusting screw rod is screwed in a screw hole horizontally arranged on the translational bulge, the outer end of the translational adjusting screw rod rotatably penetrates out of the hanging plate and is provided with a handle, and a limiting structure for limiting the translational adjusting screw rod to axially move is arranged between the translational adjusting screw rod and the hanging plate (in the implementation, the limiting structure can be a circle of a circle which is arranged along the circumferential direction of the translational adjusting screw rod The boss and the corresponding groove); the upper end of the adjusting rod is arranged on the translational baseplate.

Therefore, the translation adjustment of the translation substrate can be realized by rotating the handle at the outer end of the translation adjusting screw rod, and the probe is driven by the adjusting rod to be close to or far away from the steel pipe along the horizontal direction, so that the detection range of the probe can be better adjusted to ensure the detection precision, and the detection position adjustment can also be realized according to the model size of the steel pipe. Has the characteristics of simple structure, convenient adjustment, stability and reliability.

And a locking mechanism is further arranged between the translational baseplate and the hanging plate, the locking mechanism comprises a dovetail groove which is formed in the concave surface of the outer side of the translational baseplate and is along the horizontal direction, a dovetail-shaped bulge is arranged on the inner side of the hanging plate in a horizontally sliding fit manner corresponding to the dovetail groove, and a locking bolt is vertically arranged and vertically penetrates through the translational baseplate from the upper end surface of the translational baseplate and abuts against the dovetail-shaped bulge to realize abutting locking. Therefore, the locking and fixing can be realized after the horizontal adjustment between the translational baseplate and the hanging plate.

Furthermore, the inner side surface of the lower part of the hanging plate and the outer side surface of the upper part of the corresponding side plate are attached to each other, the lower part of the hanging plate is provided with a positioning screw hole along the direction perpendicular to the side plate, a section of arc-shaped positioning hole which takes the positioning screw hole as the circle center is arranged above the positioning screw hole, and bolts are inserted into the arc-shaped positioning hole and the positioning screw hole respectively and penetrate through the side plate to realize the fixed connection of the side plate and the hanging plate.

Like this, the fixed connection of link plate and corresponding curb plate has been realized to simple structure, and this connection structure can also conveniently use the location screw to carry out vertical deflection to the link plate as the centre of a circle to adjust simultaneously, and then can realize adjusting the vertical deflection of the probe of adjusting lever lower extreme and adjust to adjust the detection range of probe in order to ensure the detection precision better, and can also realize detecting position according to steel pipe model size and adjust.

Furthermore, a vertical coarse adjustment mechanism is arranged on the inner side of the translational base plate, the vertical coarse adjustment mechanism comprises a vertical coarse adjustment base plate which is arranged along the inner side surface of the translational base plate in an attaching manner, a vertical sliding protrusion is arranged on the outer side of the vertical coarse adjustment base plate (the direction description uses the inner and outer directions of the detection box as the inner and outer direction description basis), the vertical sliding protrusion is vertically slidably matched in a vertical sliding groove on the translational base plate in a limiting manner by the vertical sliding protrusion, the vertical coarse adjustment mechanism further comprises a vertical coarse adjustment screw rod, the lower end of the vertical coarse adjustment screw rod is screwed in a screw hole which is vertically arranged on the vertical sliding protrusion, the upper end of the vertical coarse adjustment screw rod rotatably penetrates through the upper surface of the translational base plate and is provided with a handle, and a limiting structure for limiting the vertical coarse adjustment screw rod to axially move is arranged between the vertical coarse adjustment screw rod and the translational base plate (the limiting structure can be a circle of boss and a corresponding groove which are arranged along the circumferential direction of the vertical coarse adjustment screw rod when the limiting structure is implemented); the upper end of the adjusting rod is arranged on the vertical rough adjusting base plate.

Like this, can rely on the handle of rotating vertical coarse adjusting screw rod upper end, and then realize the preliminary adjustment to position about the regulating stem, and then drive the probe through adjusting the pole and be close to or keep away from the steel pipe along vertical direction to adjust the detection range of probe in order to ensure the detection precision better, and can also realize detecting position according to the steel pipe model size and adjust. Has the characteristics of simple structure, convenient adjustment, stability and reliability.

Furthermore, a vertical fine adjustment mechanism is further arranged on the vertical coarse adjustment substrate and comprises a vertical fine adjustment screw rod which is vertically arranged, the upper portion of the vertical fine adjustment screw rod is rotatably arranged on a mounting protrusion which transversely extends out of one side of the vertical coarse adjustment substrate, a handle is arranged at the upper end of the vertical fine adjustment screw rod and extends out of the mounting protrusion, a limiting structure used for limiting the vertical fine adjustment screw rod to move axially is further arranged between the vertical fine adjustment screw rod and the mounting protrusion, the lower end of the vertical fine adjustment screw rod is in threaded fit with a horizontally arranged vertical fine adjustment nut, the vertical fine adjustment nut is sleeved in a horizontally arranged limiting guide sleeve, the limiting guide sleeve is arranged on the vertical coarse adjustment substrate, a vertically arranged concave-convex fit structure is arranged between the inner wall of the limiting guide sleeve and the circumferential outer wall of the vertical fine adjustment nut to limit circumferential rotation of the vertical fine adjustment nut, and the lower end of the vertical fine adjustment nut is downwards fixedly provided with the adjustment rod.

Like this, can rely on the handle of rotating vertical fine tuning screw rod upper end, and then realize the accurate adjustment to the position about the regulating stem, make its coarse adjustment first fine tuning again, can adjust the detection range of confirming the probe more accurately in order to ensure the detection precision, and can also realize detecting position according to the steel pipe model size and adjust. Has the characteristics of simple structure, convenient adjustment, stability and reliability.

Furthermore, a horizontal deflection adjusting mechanism is further arranged on the vertical coarse adjustment substrate and comprises a limiting guide sleeve, worm teeth are arranged on the outer surface of the limiting guide sleeve to form a worm wheel, the worm wheel is installed in a worm seat fixed on the vertical coarse adjustment substrate, a horizontally arranged worm is further installed on the worm seat, the worm and the worm wheel are meshed in a self-locking mode, and one end of the worm extends out of the worm seat and is provided with a handle.

Like this, can rely on the handle that rotates the worm outer end, rely on the worm gear transmission pair to drive the horizontal rotation of regulation pole, and then drive the adjustment that the probe realized horizontal deflection position, can adjust the detection range of confirming the probe more accurately in order to ensure the detection precision, and can also realize detecting position according to the steel pipe model size and adjust. Meanwhile, the structure skillfully combines a worm gear transmission pair and a screw nut mechanism together, and realizes the self-rotation limit of a nut in the screw nut mechanism by means of the self-locking function of the worm gear; therefore, the functions of adjusting the up-and-down movement and the autorotation of the adjusting rod are realized by a simple structure. Has the characteristics of simple structure, convenient adjustment, stability and reliability.

Preferably, the steel pipe advancing mechanism comprises a pair of advancing rollers, the circumferential surfaces of the advancing rollers are provided with inwards concave arc-shaped friction grooves, the friction grooves on the circumferential surfaces of the advancing rollers are oppositely arranged and used for clamping the steel pipe in the steel pipe advancing mechanism, the two advancing rollers are respectively in transmission connection with the same steel pipe advancing motor through a set of advancing roller transmission mechanism, and the steel pipe advancing motor is used for driving the two advancing rollers to rotate relatively so as to drive the steel pipe to advance.

Therefore, the steel pipe is driven to advance by the pair of advancing rollers rotating synchronously and relatively, the advancing reliability of the steel pipe is guaranteed, the steel pipe is prevented from being deformed to influence subsequent flaw detection due to unbalanced force application, and the flaw detection effect is better guaranteed.

Preferably, the steel pipe advancing mechanism further comprises an advancing roller mounting frame with a rectangular frame structure, two advancing roller shafts arranged in parallel at intervals are rotatably mounted in the inner cavity of the advancing roller mounting frame, the planes of the two advancing roller shafts are perpendicular to the movement path of the steel pipe, the advancing rollers are mounted on the advancing roller shafts, the advancing roller transmission mechanism comprises the advancing roller shafts and intermediate shafts arranged in parallel at intervals with the advancing roller shafts, the intermediate shafts are rotatably mounted on the advancing roller mounting frame and provided with power input ends extending out of the advancing roller mounting frame, the power input ends of the respective intermediate shafts in the two advancing roller transmission mechanisms extend out of different sides of the advancing roller mounting frame, the parts of the intermediate shafts located in the advancing roller mounting frame are in transmission connection with the corresponding advancing roller shafts through a pair of external gears, and worm gears are mounted on the power input ends of the intermediate shafts located outside the advancing roller mounting frame, worm wheel and a worm that is on a parallel with steel pipe motion path direction and sets up at the roller mounting bracket lateral surface that advances mesh, and two sets of roller drive mechanism's that advances worm is provided with gear and a power input gear meshing in the one end of equidirectional separately, power input gear perpendicular to steel pipe motion path sets up and rotationally installs on the outer terminal surface of roller mounting bracket that advances, the roller mounting bracket that advances all leaves the space that supplies the steel pipe to pass through along steel pipe motion path direction's front and back both ends terminal surface and power input gear middle part, and the one end and the steel pipe of power input gear advance and connect with motor drive.

This steel pipe mechanism that advances like this can rely on same steel pipe to advance and drive two rollers of advancing relatively synchronous revolution simultaneously with electronic, realizes the transmission of steel pipe better. Meanwhile, the steel pipe advancing mechanism has the advantages of simple structure, ingenious and compact layout, reliable transmission and the like. Further, one end of the power input gear is connected with the steel pipe in a transmission mode through a motor in a forward mode through a belt, the structure is simple, transmission is reliable, further, the steel pipe is located on the bottom plate below the forward roller mounting frame in a forward mode through the motor, and the structure is simple, installation is convenient, and power transmission is convenient.

As optimization, still be provided with steel pipe friction guiding mechanism in the steel pipe advancing mechanism, steel pipe friction guiding mechanism is including a pair of lever drive plate that the interval set up side by side, and lever drive plate place plane is parallel with steel pipe advancing direction, and the lever drive plate rotationally installs at same root on the jackshaft, one is installed to the one end that the lever drive plate is located the advancing roller mounting bracket the advancing roller axle and constituting the regulation with advancing the roller axle, a horizontal fixedly connected with regulating plate between two lever drive plate rear ends, be provided with the regulation hole of a bar along steel pipe advancing direction on the regulating plate, be provided with an adjusting bolt in the regulation hole perpendicularly, adjusting bolt one end is fixed on the advancing roller mounting bracket, and adjusting bolt is located the upper and lower surface of regulating plate and respectively has connect a set nut soon.

In the structure, the adjusting position is transferred to the outer position of the advancing roller mounting frame by adopting the lever transmission plate, so that the adjusting operation is more convenient and labor-saving, and meanwhile, the lever transmission plate takes the intermediate shaft as a rotating axis, so that the transmission structure of the advancing roller transmission mechanism is not influenced in the adjusting process; therefore, the adjustable adjusting device has the advantages of simple structure, reliable, convenient, fast and labor-saving adjustment and the like. Meanwhile, the structure can be conveniently adjusted to realize the compression transmission of steel pipes with different sizes and models.

Preferably, the steel pipe rotating mechanism comprises a main transmission box body, guide sleeves are rotatably arranged at the front end and the rear end of the main transmission box body along the direction of the advancing path of the steel pipe, a hollow main shaft is fixedly connected between the guide sleeves, the guide sleeves and the inner cavity of the hollow main shaft form the advancing path of the steel pipe, the front end and the rear end of the advancing roller mounting frame are fixedly arranged on the hollow main shaft, a rotating output wheel is further fixedly arranged on the hollow main shaft, and the rotating output wheel is in transmission connection with a motor for rotating the steel pipe.

Like this, can rely on the steel pipe rotation to pass through the belt pulley with the motor and drive hollow main shaft rotatory, and then drive whole roller mounting bracket that gos forward rotatory for the steel pipe is driven when being driven to go forward and is rotated. Therefore, the steel pipe rotating mechanism can drive the steel pipe to rotate, meanwhile, the advancing of the steel pipe is not influenced, and the steel pipe rotating mechanism has the advantages of simple structure, reliable transmission, stable rotating output and the like.

Furthermore, the rotary output wheel is a belt pulley and is in transmission connection with a motor for rotating the steel pipe through a belt mechanism; the structure is simple, the cost is low, the implementation is facilitated, and the cost is low. Still further, the motor for rotating the steel pipe is arranged below the main transmission box body and is arranged in parallel with the motor for advancing the steel pipe, so that the steel pipe forward-moving device is compact in structure, convenient to install and reliable in transmission.

In conclusion, the method has the advantages of being simple to implement, capable of improving the flaw detection area and the flaw detection efficiency, avoiding missed detection and improving the flaw detection reliability.

Drawings

FIG. 1 is a schematic structural view of a steel pipe flaw detection system for carrying out the method of the present invention. The steel pipe feeding and straightening device is partially in a state that a regulating side plate is cut away so as to show the internal structure.

FIG. 2 is a top view of the steel pipe feed straightener in FIG. 1.

Fig. 3 is a schematic structural diagram of the straightening roll adjusting mechanism in fig. 2.

Fig. 4 is a schematic view showing a connection structure of the reference straightening roll and the reference side plate in fig. 2 (only one reference straightening roll is shown).

Fig. 5 is a schematic perspective view of the steel pipe transmission device of fig. 1 (the positioning nut and the adjusting bolt are omitted).

Fig. 6 is a view of fig. 5 rotated at an angle.

FIG. 7 is a front view of the steel pipe flaw detector shown in FIG. 1 (the bolt is omitted in the drawing).

Fig. 8 is a schematic structural view of fig. 7 after being rotated by an angle.

Fig. 9 is a schematic structural view of fig. 7 rotated by another angle.

Fig. 10 is a vertical sectional view of the steel pipe flaw detector.

Detailed Description

In the specific implementation: the steel pipe flaw detection method is characterized in that the flaw detection on the surface of the steel pipe is realized by adopting a mode that the probe is fixed and the steel pipe advances spirally.

The present invention will be described in further detail below with reference to a steel pipe flaw detection system for carrying out the method of the present invention and its accompanying drawings.

As shown in fig. 1-10. The steel pipe flaw detection system comprises a bottom plate, wherein a steel pipe transmission device 1 used for driving a steel pipe to move along the axis direction and a steel pipe flaw detection device 2 arranged on the moving path of the steel pipe are arranged on the bottom plate, the steel pipe flaw detection system further comprises a steel pipe feeding and straightening device 3 arranged on the bottom plate, and the steel pipe feeding and straightening device 3 is arranged at the feeding end of the steel pipe transmission device and used for achieving steel pipe straightening.

Therefore, the steel pipe is straightened and then fed for flaw detection, the influence of poor straightness or surface quality caused by self deformation of the steel pipe on flaw detection effect can be better avoided, and the accuracy and reliability of flaw detection are improved.

Wherein, steel pipe feeding straightener 3 is including the straightener roller 4 that sets up in pairs, and straightener roller 4 circumferential surface is the arc of middle part indent, and every is two straightener rollers 4 in straightener roller 4 to arrange in the left and right sides of steel pipe motion route, and the axial lead of two straightener rollers 4 along the steel pipe motion direction dislocation slope setting from top to bottom for two straightener rollers 4 form two symmetrical helices with the steel pipe surface separately and contact.

Therefore, the steel pipe and the straightening rollers form two symmetrical spiral lines to be in contact with each other to realize straightening in the advancing process of the steel pipe, so that the straightening of one section of the steel pipe in the length direction can be realized only by one pair of the straightening rollers, and the steel pipe straightening device is balanced in stress, simple in structure and good in straightening effect. Preferably, each spiral line formed by the contact of the straightening roller and the surface of the steel pipe rotates 180 degrees in the circumferential direction of the surface of the steel pipe; the spiral line of a pair of straightening rollers forms 360 surrounds in the whole circumference of steel pipe just like this, ensure that the steel pipe surface receives balanced aligning force in circumference, the steel pipe outer wall is rolled extrusion to the steel pipe central direction simultaneously by the straightening roller of both sides, with the pipe wall flattening of surperficial unevenness, can also guarantee the rounding effect in circumference when guaranteeing the straightening effect in the whole length direction of steel pipe, make its aligning and rounding effect reach the best, improve steel pipe bending condition and surface defect, and then guarantee the reliability of follow-up flaw detection better.

The steel pipe feeding and straightening device 3 comprises a reference side plate 5 and an adjusting side plate 6 which are vertically and oppositely arranged on the left side and the right side of a steel pipe movement path, and the reference side plate 5 and the adjusting side plate 6 are arranged along the direction of the steel pipe movement path and are parallel to each other; the inner side surface of the reference side plate 5 is fixedly provided with a row of straightening roll bottom plates 7 along the direction of a steel pipe movement path, the straightening rolls arranged on the row of straightening roll bottom plates 7 form straightening rolls for reference, the inner side surface of the adjusting side plate 6 and the straightening rolls for reference are just opposite to the row of straightening roll bottom plates 7, and straightening roll adjusting mechanisms are respectively arranged on the row of straightening roll bottom plates 7, the straightening roll adjusting mechanisms are just opposite to the front ends of the steel pipes and are provided with straightening rolls 4 to form straightening rolls for adjustment, the straightening rolls for reference and the straightening rolls for adjustment are arranged in pairs one by one and are used for realizing compression and straightening of the steel pipes, and the straightening roll adjusting mechanisms are used for changing the distance between the straightening rolls for adjustment and the steel pipes.

Therefore, the pressing and straightening force of each pair of straightening rollers to the steel pipe can be adjusted once by means of the straightening roller adjusting mechanism, the pressing and straightening force is sequentially increased progressively along the advancing direction of the steel pipe, the steel pipe is gradually extruded and straightened for multiple times in the feeding straightening device, the final straightening effect is improved, and the reliability of follow-up flaw detection is better guaranteed. Meanwhile, the straightening roller for the reference on one side of the steel pipe can be used as a positioning reference for adjustment, so that the central line of the steel pipe is better ensured to be consistent with the motion path, and the straightness of the steel pipe after final straightening is ensured. Preferably, the contact pressure between the straightening roll for the reference and the steel pipe is gradually increased from small to large along the moving direction of the steel pipe. Therefore, the central line of the steel pipe is still consistent with the movement path after the pressing and straightening forces of each pair of straightening rollers are adjusted to be sequentially increased along the movement direction of the steel pipe; better guarantee the straightening effect.

The reference side plate 5 is provided with a driving helical gear 8 and a driven helical gear 9 which are meshed with each other corresponding to the reference straightening roller, the driving helical gear 8 is in transmission connection with a steel pipe advancing motor in the steel pipe transmission device 1, and the driven helical gear 9 is coaxially and fixedly connected with the reference straightening roller.

Therefore, the straightening roller for the benchmark can actively rotate to apply force to the steel pipe by relying on the motor which is arranged in the steel pipe transmission device and used for driving the steel pipe to advance, and can actively apply force to the steel pipe, so that the straightening effect of the steel pipe can be better ensured. The adoption of the connection of the straightening roller for the reference and the motor can ensure the stability and the reliability of transmission.

Wherein, steel pipe feeding straightener 3 includes a straightening case, and the straightening case includes two blocks of curb plates that are located steel pipe motion route left and right sides direction and two end plates 10 that are located steel pipe motion route direction of vertical setting, and two blocks of curb plates and two end plates enclose into rectangular frame and fix on the bottom plate, and the opening that supplies the steel pipe to pass through is seted up at two end plate middle parts, and two blocks of curb plates form benchmark curb plate 5 and regulation curb plate 6.

Therefore, the straightening box can better ensure the installation of the straightening rollers and the straightening pipe adjusting mechanism as a whole, ensure the mutual position relation among the straightening rollers and better ensure the straightening effect.

Wherein, still horizontal fixed connection is provided with horizontal stiffener between two blocks of curb plates. Therefore, the strength of the straightening box can be better improved, and the strength of the mutual force applied by each pair of straightening rollers is ensured to be enough to meet the straightening effect.

Wherein, two sections of arc holes 9 'for adjusting are arranged on the bottom plate 7 of the straightening roll, the two sections of arc holes for adjusting are arranged based on the same circle center, the circle center position is horizontally opposite to the center position of the straightening roll on the bottom plate 7 of the straightening roll, bolts are respectively arranged on the side plates corresponding to the two sections of arc holes for adjusting and penetrate through the arc holes 9' for adjusting, and the fixation is realized by nuts.

Therefore, the installation angle of the bottom plate of the straightening roller can be changed by means of two sections of arc-shaped holes for adjustment, and the straightening roller and the steel pipe are pressed and adjusted in a spiral line contact pressing mode, so that the pressing force of the end part of the straightening roller on the steel pipe can be changed by rotating the straightening roller along the central position of the straightening roller, and further the pressing force of the straightening roller can be adjusted. Particularly, the straightening roll for the reference on the reference side plate needs to be used as a reference for pressing adjustment, so that once the distance position from the straightening roll to the steel pipe is set, the adjustment cannot be changed, the straightening pressure is reduced after the surface of the straightening roll is worn for a period of time, and the straightening effect cannot be guaranteed. At the moment, only a new straightening roller can be replaced; however, after the installation structure of the arc-shaped hole for adjustment is adopted, when the surface of the straightening roller for the reference on the reference side plate is abraded to reduce the straightening pressure, the pressing force of the straightening roller on the steel pipe can be improved by changing the installation angle of the straightening roller, so that the service life of the straightening roller can be prolonged to a certain extent, and the production cost is greatly saved.

Wherein, the straightening roll bottom plate 7 is a circular plate, the circle center of the circular plate is the same as the corresponding circle center of the arc-shaped hole for adjustment, an angle scale 11 is arranged on the side plate outside the upper end of the straightening roll bottom plate 7, and an angle pointer line is arranged on the straightening roll bottom plate 7 just opposite to the angle scale 11.

Therefore, when the angle of the bottom plate of the straightening roller needs to be adjusted in a rotating mode, the required angle can be adjusted better according to the angle scale.

Wherein, the straightening roller adjusting mechanism comprises a circular table 12 which protrudes out of the middle part of the outer side surface of a straightening roller base plate and penetrates through the outer surface of a side plate, the circular table 12 and the side plate are fixedly arranged, the middle part of the circular table 12 penetrates through the circular table 12 and the straightening roller base plate 7 along the axial lead and is provided with a through hole, the outer end of the through hole is provided with a small-diameter section, the inner end of the through hole is provided with a large-diameter section, an adjusting rod 13 is coaxially arranged in the small-diameter section of the through hole and can be rotationally matched, the outer end of the adjusting rod 13 extends out of the circular table 12 and is fixedly provided with an adjusting handle 14, an axial limiting structure for limiting the axial movement of the adjusting rod 13 is arranged between the adjusting rod 13 and the small-diameter section of the through hole, the large-diameter section of the through hole can be connected with the end part of a roller base connecting cylinder 15 in a matching manner in an axial sliding manner, and a circumferential limiting structure for limiting the rotation of the roller base connecting cylinder 15 is arranged between the large-diameter section of the through hole and the roller base connecting cylinder 15, the inner peripheral surface of the end of the roller seat connecting cylinder 15, which is positioned in the through hole, is provided with an internal thread, the internal thread is matched and connected with the external thread on the adjusting rod, and the end of the roller seat connecting cylinder 15, which is far away from the through hole, is provided with a roller seat 16 for installing a straightening roller.

Therefore, the adjusting handle is rotated, the roller seat connecting cylinder can be driven to do telescopic motion along the axial direction by means of the rotation of the adjusting rod, and then the roller seat and the straightening roller on the roller seat are driven to approach or keep away from the direction opposite to the direction of the steel pipe, and further the adjustment of the pressing force of the straightening roller is realized. Has the advantages of simple structure, convenient, fast and reliable adjustment, etc.

Wherein, adjust the axial limit structure between pole 13 and the through-hole minor diameter section and obtain by adjusting the cooperation of ascending round arch of circumference and recess between pole 13 surface and the through-hole inner wall. The limiting device has the characteristics of simple structure and reliable limiting.

Wherein, the circumference limit structure between through-hole large diameter section and the roller holder connecting cylinder 15 is obtained by a protruding and recess cooperation along axial between the roller holder connecting cylinder 15 surface and the through-hole inner wall. The limiting device has the characteristics of simple structure and reliable limiting.

Wherein, the peripheral surface of the round platform 12 is also vertically penetrated and screwed with a fastening bolt, and the inner end of the fastening bolt is used for contacting with the adjusting rod 13 to realize the compression and fixation. Like this, after rotating adjustment handle rotation regulation and finishing, can rely on fastening bolt to realize the location lock and die, prevent to become flexible.

The steel pipe transmission device 1 comprises a steel pipe advancing mechanism for driving the steel pipe to advance along the axis, and a steel pipe rotating mechanism for driving the steel pipe to rotate by taking the axis as the center.

Therefore, the steel pipe rotates while advancing, so that the steel pipe is in a state of rotating and advancing when being straightened, the contact area range of the straightening roller and the steel pipe in unit time is enlarged, and the straightening effect and the straightening efficiency are improved. Meanwhile, the steel pipe advances in a rotating mode, so that the flaw detection range of a probe in the steel pipe flaw detection device is larger, flaw detection in the circumferential direction of the steel pipe can be realized by the aid of the fixed probe, missed detection is better avoided, the reliability and stability of flaw detection are enhanced, and better flaw detection effect can be realized by the aid of fewer probes.

The steel pipe advancing mechanism comprises a pair of advancing rollers 17, the circumferential surfaces of the advancing rollers 17 are provided with inwards concave arc-shaped friction grooves, the friction grooves on the circumferential surfaces of the advancing rollers 17 are oppositely arranged and used for clamping a steel pipe in the steel pipe advancing mechanism, the two advancing rollers 17 are in transmission connection with a same steel pipe advancing motor 18 through a set of advancing roller transmission mechanism, and the steel pipe advancing motor is used for driving the two advancing rollers 17 to rotate relatively so as to drive the steel pipe to advance.

Wherein, the steel tube advancing mechanism also comprises an advancing roller mounting rack 19 with a rectangular frame structure, two advancing roller shafts 20 which are arranged in parallel at intervals are rotatably arranged in the inner cavity of the advancing roller mounting rack 19, the planes of the two advancing roller shafts 20 are vertical to the motion path of the steel tube, the advancing roller 17 is arranged on the advancing roller shafts 20, the advancing roller transmission mechanism comprises the advancing roller shafts 20 and intermediate shafts 21 which are arranged in parallel at intervals with the advancing roller shafts 20, the intermediate shafts 21 are rotatably arranged on the advancing roller mounting rack 19 and are provided with a power input end which extends out of the advancing roller mounting rack 19, the power input ends of the respective intermediate shafts 21 in the two advancing roller transmission mechanisms extend out of different sides of the advancing roller mounting rack 19, the parts of the intermediate shafts in the advancing roller mounting rack 19 are in transmission connection with the corresponding advancing roller shafts 20 through a pair of external gears, and the power input ends of the intermediate shafts 21 outside the advancing roller mounting rack 19 are provided with worm gears 22 for advancing the steel tube, the steel pipe advancing worm wheel 22 is meshed with a steel pipe advancing worm 23 which is arranged on the outer side surface of the advancing roller mounting frame 19 in a direction parallel to the moving path direction of the steel pipe, one end of each of the steel pipe advancing worms 23 of the two advancing roller transmission mechanisms in the same direction is provided with a gear 24 which is meshed with a power input gear 25, the power input gear 25 is arranged perpendicular to the moving path of the steel pipe and is rotatably mounted on the outer end surface of the advancing roller mounting frame 19, spaces for the steel pipe to pass through are reserved on the front end surface and the rear end surface of the advancing roller mounting frame 19 in the moving path direction of the steel pipe and in the middle of the power input gear 25, and one end of the power input gear 25 is in transmission connection with the steel pipe advancing motor 18.

Wherein, still be provided with steel pipe friction guiding mechanism in the steel pipe advances the mechanism, steel pipe friction guiding mechanism is including a pair of lever drive plate 26 that the interval set up side by side, and lever drive plate 26 place plane and steel pipe direction of advance are parallel, and lever drive plate 26 rotationally installs at same root on the jackshaft 21, and one is installed to the one end that lever drive plate 26 is located advance roller mounting bracket 19 advance roller 20 and constitute the regulation and use the roller axle that advances, and horizontal fixedly connected with one regulating plate 27 between two lever drive plate 26 rear ends, be provided with the regulation hole of a bar along the steel pipe direction of advance on the regulating plate 27, be provided with an adjusting bolt in the regulation hole perpendicularly, adjusting bolt one end is fixed on advancing roller mounting bracket 19, and adjusting bolt is located the upper and lower surface of regulating plate and respectively has connect a set nut soon (adjusting bolt and set nut do not show in the picture.

The steel pipe rotating mechanism comprises a main transmission box 28, guide sleeves 29 are rotatably arranged at the front end and the rear end of the main transmission box 28 along the direction of the advancing path of the steel pipe, a hollow main shaft 30 is fixedly connected between the guide sleeves 29, the inner cavity of the hollow main shaft 30 forms the advancing path of the steel pipe, the front end and the rear end of the advancing roller mounting frame 19 are fixedly arranged on the hollow main shaft 30, a rotating output wheel 31 is fixedly arranged on the hollow main shaft 30, and the rotating output wheel 31 is in transmission connection with a motor for rotating the steel pipe.

Wherein, the rotary output wheel 31 is a belt pulley and is in transmission connection with a motor for rotating the steel tube through a belt mechanism; the structure is simple, the cost is low, the implementation is facilitated, and the cost is low. Still further, the motor for rotating the steel pipe is arranged below the main transmission box body and is arranged in parallel with the motor for advancing the steel pipe, so that the steel pipe forward-moving device is compact in structure, convenient to install and reliable in transmission.

The steel pipe flaw detection device 2 comprises a detection box 32, through holes are respectively formed in side plates of the front side and the rear side of the detection box 32 along the advancing direction of a steel pipe, a set of flaw detection mechanism is respectively installed on the side plates of the front side and the rear side of the detection box 32, the flaw detection mechanism is provided with a flaw detection probe 33 located inside the detection box 32, the flaw detection probe 33 is fixed at the lower end of a vertically arranged adjusting rod 34, the upper end of the adjusting rod 34 is installed on the side plates of the detection box 32, and the probes of the two flaw detection mechanisms are respectively located on two sides of the advancing path of the steel pipe and are just opposite to the advancing path of the steel pipe.

Therefore, in the steel pipe flaw detection device, the probes are arranged on the left and the right respectively, the mode that the steel pipe advances spirally is matched, flaw detection is carried out in the mode that the probes are fixed and the steel pipe advances spirally, flaw detection on the whole surface of the steel pipe can be well realized by a simpler structure, the flaw detection efficiency is improved, the missing detection is avoided, and the flaw detection reliability is improved.

The steel pipe flaw detection devices are two arranged at intervals along the advancing direction of the steel pipe, the probe in one steel pipe flaw detection device is an ultrasonic detection probe, and the probe in the other steel pipe flaw detection device is an eddy current detection probe; in the steel pipe flaw detection device provided with the ultrasonic detection probe, a flexible sliding sleeve 35 which is matched with a steel pipe to form dynamic seal is arranged in a through hole of a detection box, the detection box is filled with detection liquid to realize ultrasonic water film method flaw detection, and the lower end of the detection box is arranged in a detection liquid recovery container 36.

In the steel pipe flaw detection device provided with the ultrasonic detection probe, a glass observation window 37 is also arranged on the side surface of the detection box 32; the liquid level position of the detection liquid can be observed conveniently. Still further, the glass observation window 37 is provided with vertical scale marks, so that the height position of the liquid level can be conveniently and accurately acquired to ensure the flaw detection effect.

In the steel pipe flaw detection device provided with the ultrasonic detection probe, a liquid inlet pipeline (not shown in the figure) is arranged above the detection box 32, a liquid heating container (not shown in the figure) is arranged above the liquid inlet pipeline, and the liquid heating container is connected with a detection liquid recovery container through a water pump and a backflow pipeline.

Thus, the recycling of the detection liquid can be realized. More importantly, the detection liquid flows back into the detection box after being heated by the liquid heating container, micro bubbles in the detection liquid can be well eliminated, the detection effect is greatly prevented from being influenced by the micro bubbles existing in the detection liquid in the detection box, meanwhile, the steel pipe is further combined to advance in a rotary mode, bubbles on the surface of the steel pipe can be prevented from being attached by the rotation of the steel pipe, and therefore the flaw detection accuracy is greatly improved.

In the steel pipe flaw detection device provided with the ultrasonic detection probe, an overflow groove 38 is arranged on one side above a detection box 32, the overflow side of the overflow groove 38 is connected with the inner cavity of the detection box 32, and the lower end of a liquid inlet pipeline is arranged in the overflow groove. Therefore, the overflow of the overflow groove can be relied on, the fluctuation of the liquid level in the detection box can be better avoided, and the generation of bubbles can be better avoided, so that the better detection effect can be ensured.

The side plate of the detection box is also provided with a probe adjusting device, the probe adjusting device comprises a translational adjusting mechanism, the translational adjusting mechanism comprises a hanging plate 39 which is vertically arranged and fixed above the side plate of the detection box 32, the inner side surface of the hanging plate 39 is vertically attached with a translational base plate 40, the outer side of the translational base plate 40 is provided with an outward translational bulge 41, the outward translational bulge 41 is horizontally and slidably matched in a horizontal sliding groove on the hanging plate 39 through the translational bulge 41, the translational adjusting mechanism further comprises a translational adjusting screw rod 42, the translational adjusting screw rod 42 is parallel to the vertical plane where the corresponding side plate is located and horizontally arranged, the inner end of the translational adjusting screw rod 42 is screwed in a screw hole horizontally arranged on the translational bulge 41, the outer end of the translational adjusting screw rod 42 rotatably penetrates through the hanging plate 39 and is provided with a handle 43 for the translational adjusting screw rod, and a limiting structure for limiting the axial movement of the translational adjusting screw rod 42 is arranged between the translational adjusting screw rod 42 and the hanging plate 39 (implementation) The limit structure can be a circle of bosses and corresponding grooves which are arranged along the circumferential direction of the translational adjusting screw rod); the upper end of the adjustment rod 34 is mounted on a translation base plate 40.

A locking mechanism is further arranged between the translation substrate 40 and the hanging plate 39, the locking mechanism comprises a dovetail groove which is formed in the outer side surface of the translation substrate 40 in a concave mode and is along the horizontal direction, a dovetail-shaped protrusion is arranged on the inner side surface of the hanging plate 39 in a matched mode and can horizontally slide corresponding to the dovetail groove, a locking bolt (not shown in the figure) is vertically arranged, and the locking bolt vertically penetrates through the translation substrate 40 from the upper end surface of the translation substrate 40 and abuts against the dovetail-shaped protrusion to achieve abutting locking. Therefore, the locking and fixing can be realized after the horizontal adjustment between the translational baseplate and the hanging plate.

Wherein, the inner side surface of the lower part of the hanging plate 39 is attached to the outer side surface of the upper part of the corresponding side plate, the lower part of the hanging plate 39 is provided with a positioning screw hole along the direction vertical to the side plate, a section of arc-shaped positioning hole taking the positioning screw hole as the circle center is arranged above the positioning screw hole, and bolts (not shown in the figure) are respectively inserted into the arc-shaped positioning hole and the positioning screw hole and penetrate through the side plate to realize the fixed connection of the side plate and the hanging plate 39.

The inner side of the translation substrate 40 is further provided with a vertical coarse adjustment mechanism, the vertical coarse adjustment mechanism comprises a vertical coarse adjustment substrate 44 which is attached to the inner side surface of the translation substrate 40, a vertical sliding protrusion is arranged on the outer side of the vertical coarse adjustment substrate 44 (the direction description is based on the inner and outer directions of the detection box), the vertical sliding protrusion is vertically slidably matched with a vertical sliding groove on the translation substrate 40 in a limiting manner, the vertical coarse adjustment mechanism further comprises a vertical coarse adjustment screw 45, the lower end of the vertical coarse adjustment screw 45 is screwed into a screw hole vertically arranged on the vertical sliding protrusion, the upper end of the vertical coarse adjustment screw 45 rotatably penetrates through the upper surface of the translation substrate and is provided with a handle, and a limiting structure for limiting the axial movement of the vertical coarse adjustment screw 45 is arranged between the vertical coarse adjustment screw 45 and the translation substrate 40 (in the implementation process, the limiting structure can be a circle of bosses and corresponding grooves which are arranged along the circumference of the vertical coarse adjustment screw to obtain a circle ) (ii) a The upper end of the adjustment bar 34 is mounted on a vertical coarse adjustment base 44. In the specific embodiment, the translation substrate is composed of two vertical single plates fixed in parallel, one single plate close to the outside is used for setting a structure matched with the hanging plate, and the other single plate close to the inside is used for setting a structure matched with the vertical coarse adjustment substrate, so that the structure is more conveniently set and installed.

Wherein, the vertical rough adjusting base plate 44 is also provided with a vertical fine adjusting mechanism, the vertical fine adjusting mechanism comprises a vertical fine adjusting screw rod 46 which is vertically arranged, the upper part of the vertical fine adjusting screw rod 46 is rotatablely arranged on a mounting bulge 47 which transversely extends out of one side of the vertical rough adjusting base plate 44, the upper end of the vertical fine adjusting screw rod 46 extends out of the mounting bulge 47 and is provided with a handle, a limit structure which is used for limiting the vertical fine adjusting screw rod 46 to move along the axial direction is also arranged between the vertical fine adjusting screw rod 46 and the mounting bulge 47, the lower end of the vertical fine adjusting screw rod 46 is in threaded fit in a vertical fine adjusting nut 48 which is horizontally arranged, the vertical fine adjusting nut 48 is sleeved and arranged in a horizontal limit guide sleeve 49, the limit guide sleeve 49 is arranged on the vertical rough adjusting base plate 44, a vertical concave-convex fit structure which is arranged between the inner wall of the limit guide sleeve 49 and the circumferential outer wall of the vertical fine adjusting nut 48 is used for limiting the circumferential rotation of the vertical fine adjusting nut 48, the lower end of the vertical fine adjustment nut 48 is downwards fixedly provided with the adjusting rod 34.

The vertical rough adjusting base plate 44 is further provided with a horizontal deflection adjusting mechanism, the horizontal deflection adjusting mechanism comprises a limiting guide sleeve 49, worm teeth are arranged on the outer surface of the limiting guide sleeve 49 to form a worm wheel for deflection adjustment, the worm wheel for deflection adjustment is installed in a worm seat 50 fixed on the vertical rough adjusting base plate 44, a horizontally arranged worm 51 for deflection adjustment is further installed on the worm seat 50, the worm 51 for deflection adjustment and the worm wheel for deflection adjustment are meshed in a self-locking mode, and one end of the worm 51 for deflection adjustment extends out of the worm seat 50 and is provided with a handle.

Like this, can rely on the handle that rotates the adjustment of deflecting with the worm outer end, rely on the worm gear transmission pair to drive the horizontal rotation of regulation pole, and then drive the adjustment that the probe realized the horizontal deflection position, can adjust the detection range of confirming the probe more accurately in order to ensure the detection precision, and can also realize detecting position according to the steel pipe model size and adjust. Meanwhile, the structure skillfully combines a worm gear transmission pair and a screw nut mechanism together, and realizes the self-rotation limit of a nut in the screw nut mechanism by means of the self-locking function of the worm gear; therefore, the functions of adjusting the up-and-down movement and the autorotation of the adjusting rod are realized by a simple structure. Has the characteristics of simple structure, convenient adjustment, stability and reliability.

Claims

1. A steel pipe flaw detection method, adopt the probe that sets up near the surface of steel pipe to realize the steel pipe flaw detection in the method, characterized by that, in the method, adopt the probe to be fixed, the way that the steel pipe advances spirally realizes the steel pipe surface flaw detection;

the steel pipe flaw detection system comprises a steel pipe transmission device and a steel pipe flaw detection device, wherein the steel pipe transmission device is used for driving a steel pipe to move along the axis direction; the steel pipe flaw detection device comprises a detection box, wherein through holes are respectively formed in side plates of the front side and the rear side of the detection box along the advancing direction of a steel pipe, a set of flaw detection mechanism is respectively installed on the side plates of the front side and the rear side of the detection box, the flaw detection mechanism is provided with a flaw detection probe positioned in the detection box, the flaw detection probe is fixed at the lower end of a vertically arranged adjusting rod, the upper end of the adjusting rod is installed on the side plate of the detection box, and the probes of the two flaw detection mechanisms are respectively positioned on two sides of the advancing path of the steel pipe and are arranged opposite to the advancing path of the steel pipe;

the steel pipe transmission device comprises a steel pipe advancing mechanism for driving the steel pipe to advance along the axis and a steel pipe rotating mechanism for driving the steel pipe to rotate by taking the axis as the center;

the steel pipe advancing mechanism comprises a pair of advancing rollers, the circumferential surfaces of the advancing rollers are provided with inwards concave arc-shaped friction grooves, the friction grooves on the circumferential surfaces of the advancing rollers are oppositely arranged and used for clamping the steel pipe in the advancing rollers, the two advancing rollers are respectively in transmission connection with the same steel pipe advancing motor through a set of advancing roller transmission mechanism, and the steel pipe advancing motor is used for driving the two advancing rollers to rotate relatively so as to drive the steel pipe to advance; the steel pipe advancing mechanism also comprises an advancing roller mounting frame with a rectangular frame structure, two advancing roller shafts which are arranged in parallel at intervals are rotatably arranged in the inner cavity of the advancing roller mounting frame, the planes of the two advancing roller shafts are perpendicular to the movement path of the steel pipe, the advancing rollers are arranged on the advancing roller shafts, the advancing roller transmission mechanism comprises the advancing roller shafts and intermediate shafts which are arranged in parallel at intervals with the advancing roller shafts, the intermediate shafts are rotatably arranged on the advancing roller mounting frame and are provided with power input ends extending out of the advancing roller mounting frame, the power input ends of the respective intermediate shafts in the two advancing roller transmission mechanisms extend out of different sides of the advancing roller mounting frame, the parts of the intermediate shafts positioned in the advancing roller mounting frame are in transmission connection with the corresponding advancing roller shafts through a pair of external gears, worm gears are arranged on the power input ends of the intermediate shafts positioned outside the advancing roller mounting frame, and are meshed with a worm which is arranged on the outer side surface of the advancing roller mounting frame in a direction parallel to the movement path of the steel pipe, the worm of each of the two sets of advancing roller transmission mechanisms is provided with a gear and a power input gear which are meshed with each other at one end in the same direction, the power input gear is perpendicular to the movement path of the steel pipe and is rotatably arranged on the outer end face of the advancing roller mounting frame, spaces for the steel pipe to pass through are reserved on the end faces of the front end and the rear end of the advancing roller mounting frame in the movement path direction of the steel pipe and in the middle of the power input gear, and one end of the power input gear is in transmission connection with a motor for advancing the steel pipe.

2. The steel tube flaw detection method according to claim 1, wherein a probe adjustment device is further provided on the side plate of the detection box, the probe adjustment device includes a translation adjustment mechanism, the translational adjusting mechanism comprises a hanging plate which is vertically arranged and fixed above a side plate of the detection box, a translational base plate is vertically attached to the inner side surface of the hanging plate, an outward translational bulge is arranged on the outer side of the translational base plate, the translational base plate can be horizontally and slidably matched in a horizontal sliding groove in the hanging plate by virtue of the translational bulge in a limiting manner, the translational adjusting mechanism also comprises a translational adjusting screw rod, the translational adjusting screw rod is parallel to a vertical plane where the corresponding side plate is located and is horizontally arranged, the inner end of the translational adjusting screw rod is screwed in a screw hole horizontally arranged in the translational bulge, the outer end of the translational adjusting screw rod can rotatably penetrate through the hanging plate and is provided with a handle, and a limiting structure used for limiting the axial movement of the translational adjusting screw rod is arranged between the translational adjusting screw rod and the hanging plate; the upper end of the adjusting rod is arranged on the translational baseplate.

3. The steel pipe flaw detection method of claim 2, wherein the inner side surface of the lower portion of the hanging plate and the outer side surface of the upper portion of the corresponding side plate are attached to each other, the lower portion of the hanging plate is provided with a positioning screw hole along a direction perpendicular to the side plate, an arc-shaped positioning hole with the positioning screw hole as a circle center is arranged above the positioning screw hole, and bolts are inserted into the arc-shaped positioning hole and the positioning screw hole respectively and penetrate through the side plate to fixedly connect the side plate and the hanging plate.

4. The steel tube flaw detection method according to claim 2, wherein a vertical coarse adjustment mechanism is further arranged on the inner side of the translational base plate, the vertical coarse adjustment mechanism comprises a vertical coarse adjustment base plate which is attached to and arranged along the inner side surface of the translational base plate, a vertical sliding protrusion is arranged on the outer side of the vertical coarse adjustment base plate, the vertical sliding protrusion is vertically slidably matched in a vertical sliding groove in the translational base plate in a limiting manner, the vertical coarse adjustment mechanism further comprises a vertical coarse adjustment screw rod, the lower end of the vertical coarse adjustment screw rod is screwed in a screw hole which is vertically arranged in the vertical sliding protrusion, the upper end of the vertical coarse adjustment screw rod rotatably penetrates through the upper surface of the translational base plate and is provided with a handle, and a limiting structure for limiting the vertical coarse adjustment screw rod to axially move is further arranged between the vertical coarse adjustment screw rod and the translational base plate; the upper end of the adjusting rod is arranged on the vertical rough adjusting base plate.

5. The steel pipe flaw detection method according to claim 4, wherein the vertical rough adjustment base plate is further provided with a vertical fine adjustment mechanism, the vertical fine adjustment mechanism comprises a vertically arranged vertical fine adjustment screw, the upper part of the vertical fine adjustment screw is rotatably mounted on a mounting protrusion extending transversely from one side of the vertical rough adjustment base plate, a handle is arranged on the vertical fine adjustment screw extending out of the mounting protrusion, a limit structure for limiting the vertical fine adjustment screw to move axially is arranged between the vertical fine adjustment screw and the mounting protrusion, the lower end of the vertical fine adjustment screw is in threaded fit with a horizontally arranged vertical fine adjustment nut, the vertical fine adjustment nut is sleeved in a horizontally arranged limit guide sleeve, the limit guide sleeve is mounted on the vertical rough adjustment base plate, a vertically arranged concave-convex fit structure is arranged between the inner wall of the limit guide sleeve and the circumferential outer wall of the vertical fine adjustment nut to limit the circumferential rotation of the vertical fine adjustment nut, the lower end of the vertical fine adjustment nut is downwards fixedly provided with the adjusting rod.

6. The steel pipe flaw detection method according to claim 5, wherein a horizontal deflection adjusting mechanism is further arranged on the vertical rough adjusting base plate, the horizontal deflection adjusting mechanism comprises the limiting guide sleeve, worm teeth are arranged on the outer surface of the limiting guide sleeve to form a worm wheel, the worm wheel is installed in a worm seat fixed on the vertical rough adjusting base plate, a horizontally arranged worm is further installed on the worm seat, the worm and the worm wheel are meshed in a self-locking manner, and one end of the worm extends out of the worm seat and is provided with a handle.

7. The steel pipe flaw detection method according to claim 1, wherein the steel pipe rotating mechanism comprises a main transmission box, guide sleeves are rotatably arranged at the front end and the rear end of the main transmission box along the direction of the steel pipe advancing path, a hollow main shaft is fixedly connected between the guide sleeves, the guide sleeves and the inner cavity of the hollow main shaft form the steel pipe advancing path, the front end and the rear end of the advancing roller mounting frame are fixedly arranged on the hollow main shaft, a rotating output wheel is fixedly arranged on the hollow main shaft, and the rotating output wheel is in transmission connection with the steel pipe through a motor.