CN114295716A - Surface defect detection device of crane boom - Google Patents

Abstract

The invention discloses a surface defect detection device of a crane jib, wherein a top detection assembly comprises: the first detection piece is arranged on the lower surface of the support piece; the side detection assembly includes: the upper ends of the supporting frames of the two lateral detection assemblies are respectively connected to the lower surface of the supporting piece in a left-right movable manner, and the opposite surfaces of the two supporting frames are respectively provided with the second detection piece; the bottom detection assembly includes: the device comprises at least one semicircular support ring and at least one third detection piece, wherein at least one pair of side frames are respectively connected to the lower surface of the support piece in a left-right moving mode, two ends of each semicircular support ring are respectively connected with the lower end of each pair of side frames, and the third detection piece is arranged on the inner surface of each semicircular support ring; in the detection state, the first detection piece, the two second detection pieces and the third detection piece form a detection ring in an enclosing mode. The invention can realize the positioning of the surface defects of the crane jib and the full-automatic detection.

Description

Surface defect detection device of crane boom

Technical Field

The invention relates to the technical field of crane jib defect detection, in particular to a crane jib surface defect detection device.

Background

The crane is convenient to move in place, flexible in actions such as lifting, amplitude changing, rotation and the like, and is widely applied to construction operation of hoisting and tower assembling of the angle steel tower of the power transmission line at present. The crane boom is used as a main stressed part of the crane, is influenced by alternating load, fatigue, frictional wear, corrosion and the like, is easy to generate structural defects to cause the crane boom to be broken due to strength reduction, and is a main cause for the occurrence of failure and breakage accidents of the crane boom. Therefore, the positioning detection of the structural defects of the crane jib has important significance for effectively preventing the crane jib from breaking accidents and ensuring the safe operation of the hoisting and tower assembling construction of the power transmission line crane.

After the crane is used for a certain time, the conventional maintenance generally detects whether the structural defects exist on the suspension arm through manual visual inspection, if some abnormalities exist on the suspension arm, the abnormal position is marked, and then the repeated detection is performed emphatically. Mainly depends on human eye observation and detection, and the structure defect false detection and missing detection are inevitable. Meanwhile, the crane boom has a complex cross section shape, the sizes of the cross sections of booms with different sections are different, and the detection difficulty is high.

Disclosure of Invention

The embodiment of the invention provides a surface defect detection device for a crane jib, which aims to solve the problems of false detection and missing detection easily caused by manual detection in the prior art.

The embodiment of the invention discloses the following technical scheme:

a surface defect detection device of a crane boom comprises: the device comprises a top detection assembly, two side detection assemblies and a bottom detection assembly;

the top detection assembly includes: the detection device comprises a supporting piece and a first detection piece, wherein the first detection piece is arranged on the lower surface of the supporting piece;

each of the side detection assemblies includes: the upper ends of the supporting frames of the two lateral detection assemblies are respectively connected to the lower surface of the supporting piece in a left-right movable manner, the two supporting frames are respectively symmetrically positioned at the left side and the right side of the middle part of the supporting piece, and the second detection pieces are respectively arranged on the opposite surfaces of the two supporting frames;

the bottom detection assembly comprises: the detection device comprises at least one semicircular support ring and at least one third detection piece, wherein at least one pair of side frames are respectively connected to the lower surface of the support piece in a left-right moving mode, the at least one pair of side frames are respectively symmetrically positioned at the left side and the right side of the middle part of the support piece, two ends of each semicircular support ring are respectively connected with the lower end of each pair of side frames, and the third detection piece is arranged on the inner surface of the semicircular support ring;

in a detection state, the first detection piece, the two second detection pieces and the third detection piece form a detection ring for the crane boom to pass through.

The surface defect detection device for the crane jib of the embodiment of the invention can realize the positioning of the surface defect of the crane jib, realize the full-automatic detection, realize the rapid and efficient detection, prevent the occurrence of the false detection and the missing detection of the surface defect of the crane jib, and has important significance for effectively preventing the occurrence of the breakage accident of the crane jib and ensuring the safe operation of the hoisting and tower assembling construction of the power transmission line crane.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a surface defect detection device of a crane boom according to an embodiment of the present invention;

FIG. 3 is a left side view of a surface defect detection device of a crane boom of an embodiment of the present invention;

FIG. 4 is a schematic view of a part of the structure of a surface defect detection device of a crane boom according to an embodiment of the invention;

FIG. 5 is a schematic diagram of a second partial structure of the surface defect detection device for the boom of the crane according to the embodiment of the invention;

FIG. 6 is a schematic diagram of a part of the structure of the surface defect detection device of the crane boom according to the embodiment of the invention;

FIG. 7 is a schematic diagram of a part of the structure of the surface defect detection device of the crane boom according to the embodiment of the invention;

FIG. 8 is a schematic diagram of a partial structure of the surface defect detection device of the crane boom according to the embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, the boom 1 of the conventional mobile crane is generally U-shaped in cross section, that is, the upper surface and two side surfaces of the boom 1 are flat surfaces, and the lower surface is an approximately arc surface.

The embodiment 1 of the invention discloses a surface defect detection device for a crane boom, which is used for detecting the boom 1 with the cross section shape. As shown in fig. 1 to 8, the surface defect detecting apparatus includes: top detection component, two lateral part detection components and bottom detection component.

Wherein, top determine module includes: a support member 2 and a first detection member. The first detecting member is provided on the lower surface of the support member 2. The supporting member 2 is a hollow cavity in which a control device, a power supply, a data acquisition and transmission device and the like can be arranged.

Wherein, each side detection component includes: a support frame 3 and a second detection piece. The upper ends of the supporting frames 3 of the two lateral detection assemblies are respectively connected on the lower surface of the supporting piece 2 in a left-right movable manner. The two support frames 3 are respectively symmetrically positioned at the left side and the right side of the middle part of the support member 2. The opposite surfaces of the supporting frames 3 of the two lateral detection assemblies are respectively provided with a second detection piece. The left and right directions in the embodiment of the present invention refer to the width direction on the cross section of the boom 1, and the front and back directions refer to the length extending direction of the boom 1, which will not be described in detail below.

Wherein, bottom detection component includes: at least one semicircular support ring 4 and at least one third detection member. At least one pair of side frames 5 are respectively attached to the lower surface of the support member 2 to be movable left and right. At least one pair of side frames 5 are symmetrically positioned at left and right sides of the middle portion of the supporter 2, respectively. Both ends of each semicircular support ring 4 are connected to the lower ends of each pair of side frames 5, respectively. The third detector is arranged on the inner surface of the semicircular support ring 4.

In the detection state, the first detection piece, the two second detection pieces and the third detection piece form a detection ring in an enclosing mode. The detection ring is based on the cross-sectional shape profile of boom 1, and therefore, the detection ring is letter U-shaped with the upper seal.

When the crane boom detection ring is used, the boom 1 of the crane is arranged in the detection ring in a penetrating mode, so that the detection end of the first detection piece is attached to the upper surface of the boom 1, the detection ends of the two second detection pieces are respectively attached to the two side surfaces of the boom 1, and the detection end of the third detection piece is attached to the arc-shaped lower surface of the boom 1, so that the defects of the corresponding surface of the boom 1 are respectively detected. Through the automatic detection mode of the instrument, the problems of false detection and missed detection easily caused by manual detection can be solved.

Example 2

The embodiment 2 of the invention discloses a surface defect detection device for a crane boom. As shown in FIGS. 1 to 8, the surface defect inspection apparatus of example 2 is the same as that of example 1. In addition, embodiment 2 specifically discloses an implementation structure of a power member for driving the surface detection device to travel on the boom 1.

Specifically, the lower surface of the support member 2 is provided with four bearing seats 5, which are mounted by means of threaded engagement using bolts. Two bearing blocks 5 are located at the front end of the first detection member, and the other two bearing blocks 5 are located at the rear end of the first detection member. The front and back directions in the embodiment of the present invention refer to the length direction of the boom 1, i.e. the left and right directions shown in fig. 3, and are not described in detail below. Two bearing blocks 5 at the same end (front end or rear end) are provided with a rotatable transmission shaft 6, and specifically, the transmission shaft 6 is installed in an inner hole of a rolling bearing. Each transmission shaft 6 is sleeved with at least one walking wheel 7, and the walking wheels 7 can be fixed on the transmission shafts 6 through jackscrews or shaft keys. More preferably, two walking wheels 7 are uniformly arranged on the same transmission shaft 6 at intervals, and the distance between the two walking wheels 7 is adjustable, so that the lifting arm 1 with different section widths can be adapted, and the walking wheels 7 are always ensured to contact and roll with the upper surface of the lifting arm 1. Preferably, the supporting member 2 is i-shaped, and the traveling wheels 7 at the front end and the rear end are respectively positioned at the grooves formed at the front end and the rear end of the i-shaped structure. Two driven wheels 8 are respectively sleeved at two ends of each transmission shaft 6. Four motors 9 are installed near four corners in the cavity of the support member 2, four motor fixing plates 10 are installed in the cavity of the support member 2 through concrete passing, and the motors 9 are installed on the motor fixing plates 10 through screws and flanges. The output shaft of each motor 9 is sleeved with a driving wheel 11, and specifically, the driving wheel 11 is sleeved on the output shaft of each motor 9 after the output shaft of each motor 9 passes through the motor fixing plate 10. Each driving wheel 11 is sleeved with a transmission belt 12, each transmission belt 12 penetrates through the lower surface of the supporting piece 2 to be sleeved on each driven wheel 8, and the driven wheels 8 can reduce the rotating speed and increase the torque.

During the use, starter motor 9 drives action wheel 11 and rotates, and action wheel 11 drives drive belt 12 and removes, and drive belt 12 drives from driving wheel 8 and rotates, drives transmission shaft 6 from driving wheel 8 and rotates, and transmission shaft 6 drives walking wheel 7 and rotates, makes whole device can follow the fore-and-aft direction and remove on davit 1 to carry out the full coverage to the length direction of davit 1 and detect.

Example 3

The embodiment 3 of the invention discloses a surface defect detection device for a crane boom. As shown in FIGS. 1 to 8, the surface defect detecting apparatus of example 3 is the same as that of example 1 or 2. In addition, embodiment 3 specifically discloses an implementation structure of the top detection assembly.

Specifically, the first detection member includes: a first magneto-sensitive sensor array 13. The first magneto-sensitive sensor array 13 is arranged in a bar-shaped first sensor box 14 covering the top of the cross section of the boom 1, in particular can be encapsulated in the first sensor box 14 by epoxy glue. First magnets 15 are respectively arranged in grooves at the front end and the rear end of the first sensor box 14, and the first sensor box 14 can be specifically sealed in an epoxy resin glue mode. The first magneto sensor array 13 should extend from the left side of the boom 1 to the right side of the boom 1 so that a full coverage detection in the width direction of the boom 1 can be achieved. Likewise, the first magnet 15 should also extend from the left side of the boom 1 to the right side of the boom 1. The poles of the two first magnets 15 are of opposite polarities, i.e. one is S-pole and the other is N-pole, so that excitation can be performed on the upper surface of the boom 1 and an excitation loop can be formed, and a leakage magnetic field is generated in the area where the defect (such as a crack) exists on the upper surface of the boom 1, so that the leakage magnetic field can be detected by the first magnetic sensor array 13 to determine whether the surface defect exists.

At least one first guide rod 16 is inserted through the upper and lower surfaces of the support member 2. Preferably, the number of the first guide rods 16 is four, and the first guide rods are arranged in parallel at regular intervals in the left-right direction of the support member 2 and are located on the central axis of the support member 2 in the front-rear direction. The upper surface of the first sensor housing 14 is coupled to the lower end of at least a first guide rod 16, such as by a threaded engagement. The first sensor case 14 is located between the traveling wheels 7 at the front and rear ends. The upper end of the at least one first guide rod 16 is connected to a first limit plate 17, for example, by a screw engagement. The first limit plate 17 plays a limiting role. In particular, each first guide bar 16 may be arranged on the support 2 by means of a first linear bearing 18. Two first linear bearings 18 are fixedly arranged on the upper and lower surfaces of the support member 2. Each first guide bar 16 is fixedly inserted into the holes of the corresponding two first linear bearings 18. The first linear bearing 18 guides the first guide bar 16.

Preferably, each first guiding rod 16 is sleeved with a first compression spring 19. The upper end of the first pressure spring 19 is in contact with the lower surface of the support member 2, and the lower end of the first pressure spring 19 is in contact with the upper surface of the first sensor cartridge 14. The first pressure spring 19 can apply force to the first sensor box 14, and even if the section size of the suspension arm 1 is small due to different specifications of the suspension arm 1 or the section size of the suspension arm 1 is reduced along with different sections, the height of the first sensor box 14 can be adjusted through the elastic force of the first pressure spring 19, so that the first magnetic sensor array 13 can still fit the upper surface of the suspension arm 1.

Preferably, at least one first U-shaped frame 20 is clamped on the outer surface of the first sensor box 14, and the first U-shaped frame 20 can be fixedly mounted in a mode that a bolt penetrates through the first U-shaped frame 20 and is in threaded engagement with the upper surface of the first sensor box 14. When there are a plurality of first U-shaped frames 20, the plurality of first U-shaped frames 20 are uniformly distributed at intervals. The front end and the rear end of the first U-shaped frame 20 are respectively connected with a first guide wheel 21 for guiding in the detection process, so as to assist the first detection assembly to move upwards in the front-rear direction of the upper surface of the suspension arm 1, and in addition, the first guide wheel 21 can reduce the friction force generated by adsorption because the first magnet 15 can generate the adsorption force on the suspension arm 1.

Example 4

The embodiment 4 of the invention discloses a surface defect detection device for a crane boom. As shown in fig. 1 to 8, the surface defect detecting apparatus of example 4 is the same as that of example 1, 2 or 3. Further, embodiment 4 specifically discloses an implementation structure of the side detection assembly.

The second detection member includes: a second array of vertically arranged magnetic sensors 22 in the form of strips. The second magnetic sensor array 22 is disposed in a second sensor box 23, and may be specifically sealed in the second sensor box 23 by epoxy resin. The grooves at the front end and the rear end of the second sensor box 23 are respectively provided with a second magnet 24, and the second magnet can be specifically sealed in the second sensor box 23 through epoxy resin. The second magneto sensor array 22 and the second magnet 24 should extend vertically from the upper end of the outer side wall of the boom 1 to the lower end of the boom 1 so that full coverage detection of the side surface of the boom 1 can be achieved. The detection principle of the second magnetic sensor array 22 and the second magnet 24 is the same as that of the first magnetic sensor array 13 and the first magnet 15, and the description thereof is omitted.

The lower surface of the support member 2 is provided with a first linear guide 25 on each of the left and right sides symmetrical to the middle of the support member 2. Each first linear guide 25 is provided with a movable first slider 26. Preferably, the end of each first linear guide 25 facing the edge of the support 2 is provided with a first limit stop 27 to prevent the first slider 26 from falling off. In one specific embodiment, the first slider 26 is movably coupled to the first linear guide 25 by: the first linear guide rail 25 is in a strip shape with an I-shaped section, the first slide block 26 is in a U shape, and convex blocks extend from the inner surfaces of two side walls of the U shape and are clamped in the I-shaped grooves; a first sliding groove 28 parallel to the first linear guide rail 25 is formed in the lower surface of the support member 2 and is symmetrical to the front end and the rear end of each first linear guide rail 25, first convex plates extend from the front end and the rear end of the first sliding block 26, a threaded rod of at least one bolt sequentially penetrates through each first convex plate and the first sliding groove 28, and after the position of the first sliding block 26 is adjusted, the position of the first sliding block 26 is locked through screwing of a nut. The size of the nut is larger than the width of the first runner 28 so that the first slider 26 can move on the first linear guide 25 and cannot fall.

The lower surface of each first sliding block 26 is connected to the upper end of each support frame 3 in the shape of a vertically downward frame strip, and the lower surface of each first sliding block can be engaged and connected through threads. Each support frame 3 is provided with at least one second guide rod 29. Preferably, the number of the second guide rods 29 penetrating through the support frame 3 at the same height is two, and two second guide rods 29 are respectively penetrating through the support frame 3 near the upper end and the lower end. Specifically, the support frame 3 is composed of two vertical plates parallel to each other. Two risers of support frame 3 are near the position of upper end respectively at front and back both ends and respectively extend a boss on the riser surface, and similarly, two risers of support frame 3 are near the position of lower extreme respectively at front and back both ends and extend a boss. Each second guide bar 29 may be arranged on the support frame 3 by means of a second linear bearing 30. Each second linear bearing 30 is fixedly installed at each boss through a flange. Two second guide rods 29 are inserted into the holes of the second linear bearings 30 at the same height and opposite bosses on the same side. The second linear bearing 30 guides the second guide rod 29. One end of each second guiding rod 29 on the same side of each supporting frame 3 is connected with the outer surface of the second sensor box 23 on the same side, and the connection can be realized through threaded engagement. The other end of the second guiding rod 29 at the same height on the same side of each supporting frame 3, which is far away from the suspension arm 1, is connected with a second limiting plate 31, which can be connected through threaded engagement. The second limit plate 31 functions as a limit.

By moving the first slide block 26, the positions of the support frames 3 can be adjusted, so that the distance between the two support frames 3 can be changed according to the width of the boom 1, the second magnetic sensor arrays 22 on the two sides of the boom 1 are respectively attached to the two side surfaces of the boom 1, and the boom is suitable for the boom with different widths to detect the defects of the side surfaces.

Preferably, each second guiding rod 29 is sleeved with a second compression spring 32. One end of each second pressure spring 32 is in contact with the outer surface of the vertically arranged strip-shaped second sensor box 23 on the same side, and the other end of each second pressure spring 32 is in contact with the support frame 3 on the same side. The second pressure spring 32 can apply force to the second sensor box 23, and even if the cross-sectional dimension of the boom 1 is shrunk, the distance between the second sensor box 23 and the side surface of the boom 1 can be adjusted by the elastic force of the second pressure spring 32, so that the second magnetic sensor array 22 can still fit the side surface of the boom 1.

Preferably, at least one second U-shaped frame 33 is clamped on the outer surface of the second sensor box 23, and the second sensor box 23 can be fixedly mounted by a bolt which passes through the second U-shaped frame 33 and is in threaded engagement with the outer surface of the second sensor box 23. The front and rear ends of the second U-shaped frame 33 are connected to the second guide wheels 34, respectively, to assist the second detecting member to move in the front and rear directions of the side surface of the boom 1, and the second guide wheels 34 can reduce the friction force generated by the attraction due to the attraction force generated by the second magnet 24 to the boom 1.

Preferably, two second linear guides 35 parallel to the first linear guides 25 are symmetrically disposed at front and rear ends of each first linear guide 25 on the lower surface of the support member 2, respectively. Each second linear guide 35 is provided with a movable second slider 36. Preferably, a second limit stop 37 is provided at an end of each second linear guide 35 facing the edge of the supporting member 2 to prevent the second slider 36 from falling off. In one specific embodiment, the second slider 36 is movably coupled to the second linear guide 35 by: the second linear guide rail 35 is in an I shape, the second sliding block 36 is in a U shape, and convex blocks extend from the inner surfaces of two side walls of the U shape and are clamped in the I-shaped grooves; a second sliding groove 38 parallel to the second linear guide rail 35 is respectively formed at the front end and the rear end of each second linear guide rail 35 symmetrically on the lower surface of the support member 2, second convex plates extend from the front end and the rear end of the second sliding block 36, a threaded rod of at least one bolt sequentially penetrates through each second convex plate and the second sliding groove 38, the position of the second sliding block 36 is locked by screwing a nut, and the size of the nut is larger than the width of the second sliding groove 38, so that the second sliding block 36 can move on the second linear guide rail 35 and cannot fall.

The lower surface of each second slider 36 is connected to a side frame 39. At least one third guide wheel 40 is provided on the opposite surfaces of the side frames 39 on the left and right sides, respectively. Specifically, the side frame 39 may be composed of two parallel vertical plates, the fixing seat 41 is installed between the two parallel vertical plates of the side frame 39, and the third guide wheel 40 is installed on the fixing seat 41. Preferably, the third guide wheels 40 are located at a hollow position formed in the middle of the side frame 39, and the number of the third guide wheels 40 at each side is two. The third guide wheel 40 can run in the front-rear direction on the side surface of the boom 1. By moving the second slider 36, the position of the side frames 39 can be adjusted, so that the distance between the side frames 39 on both sides can be changed according to the width of the boom 1, so that the third guide wheels 40 on both sides of the boom 1 respectively fit both side surfaces of the boom 1, and the boom can adapt to different widths of booms to walk on the side surfaces. When the detection device detects the suspension arm 1, in order to prevent the detection device from deviating during movement, the third guide wheel 40 has a limiting effect on the straightness of the whole detection route.

Preferably, the lower end of each side frame 39 is connected to a hinge base 42 by screws. Two ends of the third U-shaped frame 43 are fixedly connected with the hinge seats 42 at the lower ends of the two side frames 39 on the same side. The third U-shaped frame 43 is used to increase the rigidity of the side frame 39 and prevent the side frame 39 from bending and deforming due to the suspension connection manner when the third guide wheel 40 is stressed during the detection process.

More preferably, one end of the blocking rod 44 passes through a threaded hole in the center of the third U-shaped frame 43 and abuts against the supporting frame 3 on the same side, so as to support the supporting frame 3 and prevent the supporting frame 3 from bending under stress.

Example 5

The embodiment 5 of the invention discloses a surface defect detection device for a crane boom. As shown in fig. 1 to 8, the surface defect detecting apparatus of example 5 is the same as that of example 1, 2, 3 or 4. In addition, embodiment 5 specifically discloses an implementation structure of the bottom detection assembly.

Specifically, the third detecting member includes: a third array of magneto-sensitive sensors 45. The third magnetic sensor array 45 is disposed in a third sensor housing 46, and may be specifically encapsulated in the third sensor housing 46 by epoxy glue. The grooves at the front and rear ends of the third sensor case 46 are provided with third magnets 47, and the third sensor case 46 can be specifically sealed by epoxy resin. The detection principle of the third magnetic sensor array 45 and the third magnet 47 is the same as that of the first magnetic sensor array 13 and the first magnet 15, and the description thereof is omitted.

The lower end of the side frame 39 on one side is hinged to one end of a semicircular support ring 4 and the lower end of the opposite side frame 39 on the other side is hinged to the other end of the same semicircular support ring 4 by means of a connecting piece 48. For example, the hinge may be accomplished by the hinge seats 42 as described above, i.e., when the hinge seats 42 are coupled to the lower end of the side frame 39, one end of the semicircular support ring 4 is hinged to the lower end of the hinge seat 42 on one side, and the other end of the same semicircular support ring 4 is hinged to the lower end of the opposite hinge seat 42 on the other side by the coupling member 48. The connector 48 may be in the form of a hinged hook.

The position of the connecting member 48 and the lower end of the connected side frame 39 is adjustable. Preferably, when the hinge base 42 is coupled to the lower end of the side frame 39, the position of the coupling member 48 and the coupled hinge base 42 is adjustable. The adjustable hinging position is achieved, for example, by providing pins of different heights on the side frames 39 or the hinging seats 42.

When in use, one end of the semicircular support ring 4 with the connecting piece 48 is lifted, the semicircular support ring 4 can be hung on the pin shaft at the lower end of the side frame 39 or the hinge seat 42 at the corresponding side through the connecting piece 48, so that the detection ring surrounds the suspension arm 1, and the connecting piece 48 can be taken down from the pin shaft at the lower end of the side frame 39 or the hinge seat 42 at the corresponding side, so that the detection ring is opened, so that the suspension arm 1 can be removed.

Each semicircular support ring 4 is penetrated with a plurality of third guide rods 49. The inner surface side of each semicircular supporting ring 4 has a plurality of third sensor housings 46 so that the inner side of the semicircular supporting ring 4 from one end to the other end is filled with a third magnetic sensor array 45 to achieve full coverage detection of the lower surface of the boom 1. It should be appreciated that the third sensor housing 46 is also arcuate to match the shape of the semi-circular support ring 4. The outer surface of each third sensor case 46 is connected to the upper end of at least one third guide rod 49, which is engaged with a screw. Each third retainer plate 50 is connected to a lower end of at least one third guide rod 49, and may be engaged with a screw. Preferably, an outer surface of one third sensor case 46 is coupled to upper ends of the two third guide rods 49, and thus, one third stopper plate 50 is coupled to lower ends of the two third guide rods 49, thereby making the coupling more stable. In particular, each third guide rod 49 can also be arranged on the semicircular support ring 4 by means of a third linear bearing 51. Each third linear bearing 51 is fixedly arranged on the outer surface of the semicircular supporting ring 4. Each third guide rod 49 is fixedly inserted into a hole of each third linear bearing 51. The third linear bearing 51 guides the third guide rod 49.

More preferably, when the number of the side frames 39 on the same side is at least two, the number of the semicircular supporting rings 4 is also at least two, and the side frames 39 corresponding to the two sides are respectively connected. The third sensor housings 46 on the at least two semicircular support rings 4 are staggered. In a specific embodiment of the invention, the number of the lateral frames 39 on the same side is two, the number of the semicircular supporting rings 7 is two, and the second sensor case 23 is located between the two semicircular supporting rings 7. Because the two adjacent third sensor boxes 46 on each semicircular support ring 4 are separated by a gap, missing detection can be avoided, namely, the gap between the adjacent third sensor boxes 46 on one semicircular support ring 4 can be covered and detected by the third sensor box 46 on the other semicircular support ring 4, and further, full-coverage detection of the arc-shaped lower surface of the suspension arm 1 is realized.

Preferably, a third compression spring 52 is sleeved on each third guiding rod 49. An upper end of each third compressed spring 52 is in contact with the outer surface of the corresponding third sensor case 46, and a lower end of each third compressed spring 52 is in contact with the inner surface of the corresponding semicircular support ring 4. The third pressure spring 52 can apply force to the third sensor box 46, and even if the section of the boom 1 is contracted, the position of the third sensor box 46 can be adjusted by the elastic force of the third pressure spring 52, so that the third magnetic sensor array 45 can still be attached to the lower surface of the boom 1.

Preferably, at least one fourth guide wheel 53 is symmetrically disposed on the front and rear surfaces of each third sensor housing 46 for assisting the third sensor housing 46 to travel in the front and rear direction of the lower surface of the boom 1.

The detection device of the embodiment adopts the magnetic flux leakage detection technology combined with the actual cross section size of the crane jib 1, and considers the difference of the sizes of different sections of jibs 1 of the same-tonnage crane, the design of the whole detection device is consistent with the cross section shape of the jib 1, meanwhile, the first detection piece, the second detection piece and the third detection piece respectively correspond to four surfaces of the jib 1 and are mutually independent, each independent detection piece can respectively realize the joint detection of each surface of the jib 1 through movement and independent pressure springs, the influence of the detection lift-off value on a detection signal is prevented, and meanwhile, when the cross section size of the jib 1 changes, each surface of the jib 1 can be still jointed in a certain range under the action of the pressure springs on each surface, so that the detection range of the detection device has broad range.

When in use, for example, when the size of the boom 1 of cranes with different tonnages is changed too much, the detection device is designed to detect the boom 1 of an 80t crane. When the 50t crane boom 1 is detected, the cross section size of the 50t crane boom 1 is certainly smaller than that of the 80t crane boom 1, and the change range of the pressure spring cannot compensate the reduced value of the cross section size of the boom 1. Under this condition, top determine module need not to change, and two lateral part determine module can take place empty mining only, do not have the influence to the detected signal. The first slide block 26 can be manually moved towards the center of the boom 1 to reduce the distance between the support frames 3 on both sides, so as to adapt to the section width of the boom 1 of a 50t crane. In addition, the detection of the suspension arms 1 of cranes with different tonnages can be realized only by replacing the third sensor boxes 46 with different radiuses. The whole detection device has a larger detection range, does not need to rely on external force, can carry out full-automatic detection, and realizes the acquisition of magnetic field signals of the surface defects of the suspension arm 1. The traveling wheels 7 are driven to travel, so that the whole suspension arm 1 is detected in a full-coverage mode, and the surface defects of the suspension arm 1 are prevented from being detected by mistake and being missed.

In summary, the surface defect detection device for the crane jib of the embodiment of the invention can position the surface defect of the crane jib, realize full-automatic detection, realize quick and efficient detection, prevent the occurrence of false detection and missing detection of the surface defect of the crane jib, and has important significance for effectively preventing the occurrence of breakage accidents of the crane jib and ensuring the safe operation of hoisting and tower assembling construction of a power transmission line crane.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A surface defect detection device of a crane boom is characterized by comprising: the device comprises a top detection assembly, two side detection assemblies and a bottom detection assembly;

the top detection assembly includes: the detection device comprises a supporting piece and a first detection piece, wherein the first detection piece is arranged on the lower surface of the supporting piece;

each of the side detection assemblies includes: the upper ends of the supporting frames of the two lateral detection assemblies are respectively connected to the lower surface of the supporting piece in a left-right movable manner, the two supporting frames are respectively symmetrically positioned at the left side and the right side of the middle part of the supporting piece, and the second detection pieces are respectively arranged on the opposite surfaces of the two supporting frames;

the bottom detection assembly comprises: the detection device comprises at least one semicircular support ring and at least one third detection piece, wherein at least one pair of side frames are respectively connected to the lower surface of the support piece in a left-right moving mode, the at least one pair of side frames are respectively symmetrically positioned at the left side and the right side of the middle part of the support piece, two ends of each semicircular support ring are respectively connected with the lower end of each pair of side frames, and the third detection piece is arranged on the inner surface of the semicircular support ring;

in a detection state, the first detection piece, the two second detection pieces and the third detection piece form a detection ring for the crane boom to pass through.

2. The crane boom surface defect detection apparatus of claim 1, wherein: support piece's lower surface mounting has four bearing framves, and two bearing frame symmetric positions the front end of first detection piece, two other bearing frame symmetric positions the rear end of first detection piece is located two of homopolar be provided with a rotatable transmission shaft, each on the bearing frame the cover is equipped with at least walking wheel, each on the transmission shaft the both ends of transmission shaft are respectively overlapped and are equipped with one from the driving wheel, support piece's cavity is close to four corners department and installs four motors, each the cover is equipped with the action wheel on the output shaft of motor, each the cover is established a drive belt on the action wheel, and each drive belt passes support piece's lower surface cover is established at each from the driving wheel.

3. The crane boom surface defect detecting apparatus as claimed in claim 1, wherein said first detecting member comprises: the first magnetic sensor array is arranged in a first sensor box, and first magnets are respectively arranged in grooves at the front end and the rear end of the first sensor box;

at least one first guide bar is arranged on the upper surface and the lower surface of the support piece in a penetrating mode, the upper surface of the first sensor box is connected with at least one of the lower end of the first guide bar and the upper end of the first guide bar, and the first limiting plate is connected with the upper end of the first guide bar.

4. The crane boom surface defect detection apparatus of claim 3, wherein: a first pressure spring is sleeved on each first guide rod, the upper end of each first pressure spring is in contact with the lower surface of the support piece, and the lower end of each first pressure spring is in contact with the upper surface of the first sensor box;

the outer surface of the first sensor box is provided with at least one first U-shaped frame in a clamping mode, and two ends of the first U-shaped frame are connected with first guide wheels respectively.

5. The crane boom surface defect detecting apparatus as claimed in claim 1, wherein said second detecting member comprises: the second magnetic sensor array is arranged in a second sensor box, and second magnets are respectively arranged in grooves at the front end and the rear end of the second sensor box;

the lower surface symmetry of support piece in the left and right sides at support piece's middle part respectively is provided with a first linear guide, each be provided with mobilizable first slider on the first linear guide, each the lower surface of first slider is connected each the upper end of support frame, each at least one second guide bar is worn to be equipped with by the support frame, each of support frame homonymy the one end of second guide bar is connected the homonymy the surface of second sensor box, each the same height of support frame homonymy a second limiting plate is connected to the other end of second guide bar.

6. The crane boom surface defect detection apparatus of claim 5, wherein: a second pressure spring is sleeved on each second guide rod, one end of each second pressure spring is in contact with the outer surface of the second sensor box on the same side, and the other end of each second pressure spring is in contact with the support frame on the same side;

at least one second U-shaped frame is clamped on the outer surface of the second sensor box, and two ends of the second U-shaped frame are connected with second guide wheels respectively.

7. The crane boom surface defect detection apparatus of claim 5, wherein: two second linear guide rails parallel to the first linear guide rails are symmetrically arranged at the front end and the rear end of each first linear guide rail on the lower surface of the supporting piece respectively, a movable second sliding block is arranged on each second linear guide rail, the lower surface of each second sliding block is connected with a lateral frame, and at least one third guide wheel is arranged on the opposite surfaces of the lateral frames on the left side and the right side respectively.

8. The crane boom surface defect detecting apparatus as claimed in claim 7, wherein said third detecting member comprises: the third magnetic sensor array is arranged in a third sensor box, and third magnets are arranged in grooves at the front end and the rear end of the third sensor box;

the lower extreme that is located one side the lateral part frame articulates one the one end of semi-circular support ring, is located the opposite side the lower extreme of lateral part frame passes through the connecting piece and articulates same the other end of semi-circular support ring, the connecting piece with be connected the position of the lower extreme of lateral part frame is adjustable, and a plurality of third guide bars are worn to be equipped with by each semi-circular support ring, and each the internal surface side of semi-circular support ring has a plurality ofly the third sensor box, each the surface connection of third sensor box is at least one the upper end of third guide bar, every third limiting plate connection is at least one the lower extreme of third guide bar.

9. The crane boom surface defect detection apparatus of claim 8, wherein: a third pressure spring is sleeved on each third guide rod, the upper end of each third pressure spring is in contact with the outer surface of the corresponding third sensor box, and the lower end of each third pressure spring is in contact with the inner surface of the corresponding semicircular support ring;

and at least one fourth guide wheel is symmetrically arranged on the surface of the front end and the surface of the rear end of each third sensor box.

10. The crane boom surface defect detection apparatus of claim 8, wherein: when the number of the semicircular supporting rings is at least two, the third sensor boxes on the at least two semicircular supporting rings are arranged in a staggered mode.

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