Surface defect detection device for crane boom

Abstract

The present invention discloses a surface defect detection device for a crane boom, wherein a top detection assembly comprises: a support member and a first detection member, wherein the first detection member is arranged on the lower surface of the support member; a side detection assembly comprises: a support frame and a second detection member, wherein the upper ends of the support frames of the two side detection assemblies are respectively connected to the lower surface of the support member so as to be movable left and right, and the second detection members are respectively arranged on the opposite surfaces of the two support frames; a bottom detection assembly comprises: at least one semicircular support ring and at least one third detection member, wherein at least one pair of side frames are respectively connected to the lower surface of the support member so as to be movable left and right, wherein the two ends of each semicircular support ring are respectively connected to the lower end of each pair of side frames, and the third detection member is arranged on the inner surface of the semicircular support ring; in a detection state, the first detection member, the two second detection members, and the third detection member form a detection ring. The present invention can locate surface defects of a crane boom and realize fully automated detection.

Description

Technical Field

[0001] The present invention relates to the technical field of crane boom defect detection, and in particular to a surface defect detection device for a crane boom. Background Art

[0002] Cranes are widely used in the installation and construction of angle steel towers for power transmission lines due to their ease of maneuverability and flexible lifting, luffing, and slewing. As the crane's primary load-bearing component, the boom is susceptible to structural defects caused by alternating loads, fatigue, friction, wear, and corrosion, leading to reduced strength and breakage. This is a major cause of crane boom failure and fracture. Therefore, locating and detecting structural defects in crane booms is crucial for effectively preventing boom breakage and ensuring the safe operation of transmission line crane installation and tower assembly.

[0003] After a crane has been in use for a while, routine maintenance typically involves visual inspection of the boom for structural defects. If any abnormalities are detected, the location is marked and subsequently re-inspected. This reliance on visual inspection inevitably leads to false detections and missed inspections of structural defects. Furthermore, the complex cross-sectional shape of crane booms, with varying cross-sectional dimensions for different boom sections, complicates inspection. Summary of the Invention

[0004] An embodiment of the present invention provides a surface defect detection device for a crane boom, so as to solve the problem that manual detection in the prior art easily causes misdetection and missed detection.

[0005] The embodiment of the present invention discloses the following technical solutions:

[0006] A surface defect detection device for a crane boom, comprising: a top detection component, two side detection components, and a bottom detection component;

[0007] The top detection assembly includes: a support member and a first detection member, wherein the first detection member is arranged on the lower surface of the support member;

[0008] Each of the side detection assemblies comprises: a support frame and a second detection member, wherein the upper ends of the support frames of the two side detection assemblies are respectively connected to the lower surface of the support member so as to be movable left and right, the two support frames are respectively symmetrically located on the left and right sides of the middle portion of the support member, and the second detection members are respectively provided on the opposite surfaces of the two support frames;

[0009] The bottom detection assembly includes: at least one semicircular support ring and at least one third detection member, at least one pair of side frames are respectively connected to the lower surface of the support member so as to be movable left and right, at least one pair of side frames are respectively symmetrically located on the left and right sides of the middle part of the support member, both ends of each semicircular support ring are respectively connected to the lower end of each pair of side frames, and the third detection member is arranged on the inner surface of the semicircular support ring;

[0010] In a detection state, the first detection member, the two second detection members and the third detection member form a detection ring for the crane boom to pass through.

[0011] The surface defect detection device for the crane boom of the embodiment of the present invention can locate the surface defects of the crane boom and realize fully automated detection. The detection is fast and efficient, and the occurrence of false detection and missed detection of surface defects of the crane boom is prevented. It is of great significance for effectively preventing the occurrence of crane boom breakage accidents and ensuring the safe construction of transmission line crane tower assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] Figure 1 2 is a schematic diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention in use;

[0014] Figure 2 2 is a schematic structural diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention;

[0015] Figure 3 2. It is a left side view of a surface defect detection device for a crane boom according to an embodiment of the present invention;

[0016] Figure 4 This is a partial structural diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention. Figure 1 ;

[0017] Figure 5 This is a partial structural diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention. Figure 2 ;

[0018] Figure 6 This is a partial structural diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention. Figure 3 ;

[0019] Figure 7 This is a partial structural diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention. Figure 4 ;

[0020] Figure 8 This is a partial structural diagram of a surface defect detection device for a crane boom according to an embodiment of the present invention. Figure 5 . DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figure 1 As shown, the cross-sectional shape of the boom 1 of the existing mobile crane is mostly U-shaped, that is, the upper surface and two side surfaces of the boom 1 are flat, and the lower surface is approximately an arc surface.

[0024] Embodiment 1 of the present invention discloses a surface defect detection device for a crane boom, which is used to detect the boom 1 having the above-mentioned cross-sectional shape. Figures 1 to 8 As shown, the surface defect detection device includes: a top detection component, two side detection components and a bottom detection component.

[0025] The top detection assembly includes a support member 2 and a first detection member. The first detection member is arranged on the lower surface of the support member 2. The support member 2 is a hollow cavity, in which control components, power supply, data acquisition and transmission components, etc. can be built.

[0026] Wherein, each side detection assembly includes: a support frame 3 and a second detection member. The upper ends of the support frames 3 of the two side detection assemblies are respectively connected to the lower surface of the support member 2 so as to be movable left and right. The two support frames 3 are respectively symmetrically located on the left and right sides of the middle of the support member 2. Second detection members are respectively arranged on the opposite surfaces of the support frames 3 of the two side detection assemblies. The left and right mentioned in the embodiment of the present invention refers to the width direction along the cross section of the boom 1, and the front and back refers to the length extension direction along the boom 1, which will not be repeated below.

[0027] The bottom detection assembly includes at least one semicircular support ring 4 and at least one third detection member. At least one pair of side frames 39 are movably connected to the lower surface of the support member 2. The at least one pair of side frames 39 are symmetrically located on the left and right sides of the center of the support member 2. The two ends of each semicircular support ring 4 are respectively connected to the lower ends of each pair of side frames 39. The third detection member is disposed on the inner surface of the semicircular support ring 4.

[0028] In the detection state, the first detection member, the two second detection members and the third detection member form a detection ring. The detection ring is based on the cross-sectional shape of the boom 1, and thus is in the shape of a letter U with a closed upper portion.

[0029] During use, the crane's boom 1 is placed through the detection ring, with the detection end of the first detection member attached to the upper surface of the boom 1, the detection ends of the two second detection members attached to the two side surfaces of the boom 1, and the detection end of the third detection member attached to the curved lower surface of the boom 1, so as to detect defects on the corresponding surfaces of the boom 1. This automatic detection method can solve the problem of false detection and missed detection caused by manual detection.

[0030] Example 2

[0031] Embodiment 2 of the present invention discloses a surface defect detection device for a crane boom. Figures 1 to 8 As shown, the surface defect detection device of embodiment 2 is the same as that of embodiment 1. In addition, embodiment 2 specifically discloses an implementation structure of a power member for driving the surface detection device to move on the boom 1.

[0032] Specifically, four bearing seats 5 are installed on the lower surface of the support member 2, which can be installed by bolts through threaded engagement. Two bearing seats 5 are located at the front end of the first detection member, and the other two bearing seats 5 are located at the rear end of the first detection member. The front and back in the embodiment of the present invention refers to the length direction of the boom 1, that is, Figure 3The left and right directions shown are not described in detail below. A rotatable transmission shaft 6 is provided on the two bearing seats 5 located at the same end (front end or rear end). Specifically, the transmission shaft 6 is installed in the inner hole of the rolling bearing. Each transmission shaft 6 is provided with at least one running wheel 7. Specifically, the running wheel 7 can be fixed to the transmission shaft 6 by a top screw or a shaft key. More preferably, two running wheels 7 are evenly spaced on the same transmission shaft 6, and the spacing between the two running wheels 7 is adjustable, so as to adapt to booms 1 with different cross-sectional widths, and always ensure that the running wheels 7 are in contact and rolling contact with the upper surface of the boom 1. Preferably, the support member 2 is I-shaped, and the running wheels 7 at the front and rear ends are respectively located in the grooves formed by the I-shaped structure at the front and rear ends. A driven wheel 8 is provided at each end of each transmission shaft 6. Four motors 9 are installed near the four corners in the cavity of the support member 2. Specifically, four motor fixing plates 10 are installed in the cavity of the support member 2, and the motors 9 are mounted on the motor fixing plates 10 by screws and flanges. A driving pulley 11 is mounted on the output shaft of each motor 9. Specifically, the output shaft of the motor 9 passes through a motor fixing plate 10 and is then mounted on the driving pulley 11. A transmission belt 12 is mounted on each driving pulley 11, and each transmission belt 12 passes through the lower surface of the support member 2 and is mounted on each driven pulley 8. The driven pulley 8 can reduce the speed and increase the torque.

[0033] When in use, the starting motor 9 drives the driving wheel 11 to rotate, the driving wheel 11 drives the transmission belt 12 to move, the transmission belt 12 drives the driven wheel 8 to rotate, the driven wheel 8 drives the transmission shaft 6 to rotate, and the transmission shaft 6 drives the walking wheel 7 to rotate, so that the entire device can move in the front and rear directions on the boom 1, thereby performing full coverage detection in the length direction of the boom 1.

[0034] Example 3

[0035] Embodiment 3 of the present invention discloses a device for detecting surface defects of a crane boom. Figures 1 to 8 As shown, the surface defect detection device of embodiment 3 is the same as embodiment 1 or 2. In addition, embodiment 3 specifically discloses an implementation structure of the top detection component.

[0036] Specifically, the first detection element includes a first magnetic sensor array 13. The first magnetic sensor array 13 is housed in a first sensor box 14, which is strip-shaped and covers the top of the cross-section of the boom 1. Specifically, the box 14 can be sealed with epoxy resin. First magnets 15 are located in grooves at the front and rear ends of the first sensor box 14, respectively. Specifically, the box 14 can be sealed with epoxy resin. The first magnetic sensor array 13 should extend from the left side to the right side of the boom 1, thereby achieving full coverage inspection across the width of the boom 1. Similarly, the first magnets 15 should also extend from the left side to the right side of the boom 1. The two first magnets 15 have opposite magnetic poles, one with an S pole and the other with an N pole. This allows for excitation on the upper surface of the boom 1, forming an excitation circuit. Areas of the upper surface of the boom 1 with defects (such as cracks) will generate a leakage magnetic field, which can be detected by the first magnetic sensor array 13 to determine whether the surface defect exists.

[0037] At least one first guide rod 16 passes through the upper and lower surfaces of the support member 2. Preferably, the number of the first guide rods 16 is four, which are evenly spaced and arranged in parallel along the left and right directions of the support member 2, and are located on the central axis of the front and back directions of the support member 2. The upper surface of the first sensor box 14 is connected to the lower end of the at least one first guide rod 16, for example, by threaded engagement. The first sensor box 14 is located between the front and rear walking wheels 7. The upper end of the at least one first guide rod 16 is connected to the first limit plate 17, for example, by threaded engagement. The first limit plate 17 plays a role of limiting. Specifically, each first guide rod 16 can be set on the support member 2 through a first linear bearing 18. Two first linear bearings 18 are fixedly passed through the upper and lower surfaces of the support member 2. Each first guide rod 16 is fixedly passed through the holes of the corresponding two first linear bearings 18. The first linear bearings 18 play a guiding role for the first guide rods 16.

[0038] Preferably, each first guide rod 16 is sleeved with a first compression spring 19. The upper end of the first compression spring 19 contacts the lower surface of the support member 2, and the lower end of the first compression spring 19 contacts the upper surface of the first sensor box 14. The first compression spring 19 can apply force to the first sensor box 14. Even if the cross-sectional dimensions of the boom 1 are smaller due to different specifications, or the cross-sectional dimensions of the boom 1 decrease with different sections, the elastic force of the first compression spring 19 can adjust the height of the first sensor box 14, so that the first magnetic sensor array 13 can still fit in contact with the upper surface of the boom 1.

[0039] Preferably, at least one first U-shaped frame 20 is fixed on the outer surface of the first sensor box 14, and can be fixed by means of bolts passing through the first U-shaped frame 20 and engaging with the upper surface of the first sensor box 14 through threads. When there are multiple first U-shaped frames 20, the multiple first U-shaped frames 20 are evenly spaced. The front and rear ends of the first U-shaped frame 20 are respectively connected to first guide wheels 21, which are used to play a guiding role during the detection process and assist the first detection component in moving in the front and rear directions of the upper surface of the boom 1. In addition, since the first magnet 15 generates an adsorption force on the boom 1, the first guide wheels 21 can reduce the friction generated by the adsorption.

[0040] Example 4

[0041] Embodiment 4 of the present invention discloses a device for detecting surface defects of a crane boom. Figures 1 to 8 As shown, the surface defect detection device of embodiment 4 is the same as embodiment 1, 2 or 3. In addition, embodiment 4 specifically discloses an implementation structure of the side detection component.

[0042] The second detection component includes: a second magnetic sensor array 22 arranged vertically in a strip shape. The second magnetic sensor array 22 is arranged in a second sensor box 23, and can be specifically sealed in the second sensor box 23 by epoxy resin. Second magnets 24 are respectively arranged in the grooves at the front and rear ends of the second sensor box 23, and can be specifically sealed in the second sensor box 23 by epoxy resin. The second magnetic 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 as to achieve full coverage detection of the side surface of the boom 1. The detection principle of the second magnetic sensor array 22 and the second magnet 24 is the same as the detection principle of the aforementioned first magnetic sensor array 13 and the first magnet 15, and will not be repeated here.

[0043] A first linear guide 25 is provided on the lower surface of the support member 2, symmetrically at the left and right sides of the middle portion of the support member 2. A movable first slider 26 is provided on each first linear guide 25. Preferably, a first stopper 27 is provided at one end of each first linear guide 25 facing the edge of the support member 2 to prevent the first slider 26 from falling off. In a specific embodiment, the first slider 26 is movably connected to the first linear guide 25 via the following structure: the first linear guide 25 is in the shape of an I-shaped strip, the first slider 26 is in the shape of a U, and protrusions extend from the inner surfaces of the two side walls of the U, which are engaged in the grooves of the I-shaped strip. A first slide 28 parallel to the first linear guide 25 is provided on the lower surface of the support member 2, symmetrically at the front and rear ends of each first linear guide 25. A first protrusion extends from the front and rear ends of the first slider 26. The threaded rod of at least one bolt is sequentially passed through each first protrusion and the first slide 28. After the position of the first slider 26 is adjusted, the position of the first slider 26 is locked by tightening a nut. The size of the nut is larger than the width of the first sliding groove 28 , so that the first sliding block 26 can move on the first linear guide rail 25 without falling.

[0044] The lower surface of each first slider 26 is connected to the upper end of each vertically downwardly extending frame-shaped strip of support frame 3, specifically by threaded engagement. Each support frame 3 is provided with at least one second guide rod 29. Preferably, two second guide rods 29 are provided at the same height on each support frame 3, with two second guide rods 29 provided near the upper and lower ends of each support frame 3, respectively. Specifically, the support frame 3 comprises two parallel vertical plates. Each vertical plate of the support frame 3 has a boss extending from its surface at both the front and rear ends near the upper end. Similarly, each vertical plate of the support frame 3 has a boss extending from its surface at both the front and rear ends near the lower end. Each second guide rod 29 can be mounted on the support frame 3 via a second linear bearing 30. Each second linear bearing 30 is fixedly mounted on each boss via a flange. The two second guide rods 29 are inserted into holes in the second linear bearing 30 located at two opposing bosses at the same height on the same side. The second linear bearing 30 guides the second guide rods 29. One end of each second guide rod 29 on the same side of each support frame 3 is connected to the outer surface of the second sensor box 23 on the same side, specifically through a threaded engagement. The other end of the second guide rod 29 on the same side of each support frame 3, located at the same height and facing away from the boom 1, is connected to a second stop plate 31, specifically through a threaded engagement. This second stop plate 31 serves as a stop.

[0045] By moving the first slider 26, the position of the support frame 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, so that the second magnetic sensor arrays 22 on both sides of the boom 1 are respectively attached to the two side surfaces of the boom 1, adapting to booms of different widths to perform defect detection on the side surfaces.

[0046] Preferably, a second compression spring 32 is mounted on each second guide rod 29. One end of each second compression spring 32 contacts the outer surface of the second vertically disposed strip-shaped sensor box 23 on the same side, and the other end of each second compression spring 32 contacts the support frame 3 on the same side. The second compression spring 32 applies force to the second sensor box 23. Even if the cross-sectional dimensions of the boom 1 shrink, the elastic force of the second compression spring 32 allows the distance between the second sensor box 23 and the side surface of the boom 1 to be adjusted, so that the second magnetic sensor array 22 can still conform to the side surface of the boom 1.

[0047] Preferably, at least one second U-shaped bracket 33 is fixed to the outer surface of the second sensor box 23. Specifically, the second sensor box 23 can be fixed by bolts passing through the second U-shaped bracket 33 and engaging with the outer surface of the second sensor box 23. The front and rear ends of the second U-shaped bracket 33 are respectively connected to second guide wheels 34, which can assist the second detection assembly in moving in the front-to-back direction on the side surface of the boom 1. In addition, because the second magnet 24 generates an attractive force on the boom 1, the second guide wheels 34 can reduce the friction caused by the attractive force.

[0048] Preferably, two second linear guides 35 are symmetrically disposed at the front and rear ends of each first linear guide 25 on the lower surface of the support member 2, parallel to the first linear guide 25. Each second linear guide 35 is provided with a movable second slider 36. Preferably, a second stopper 37 is disposed at one end of each second linear guide 35 facing the edge of the support member 2 to prevent the second slider 36 from falling off. In a specific embodiment, the second slider 36 is movably connected to the second linear guide rail 35 through the following structure: the second linear guide rail 35 is I-shaped, the second slider 36 is U-shaped, and the inner surfaces of the two side walls of the U-shape are extended with protrusions, which are clamped in the I-shaped grooves; on the lower surface of the support member 2, a second slide groove 38 parallel to the second linear guide rail 35 is opened symmetrically at the front and rear ends of each second linear guide rail 35, and the front and rear ends of the second slider 36 are extended with second convex plates, and the threaded rod of at least one bolt is sequentially passed through each second convex plate and second slide groove 38, and the position of the second slider 36 is locked by tightening a nut, and the size of the nut is larger than the width of the second slide groove 38, so that the second slider 36 can move on the second linear guide rail 35 and will not fall.

[0049] 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 opposing surfaces of the left and right side frames 39. Specifically, the side frame 39 can be composed of two parallel vertical plates, with a fixing seat 41 mounted between the two parallel vertical plates of the side frame 39. The third guide wheel 40 is mounted on the fixing seat 41. Preferably, the third guide wheel 40 is located in the hollow space formed in the center of the side frame 39, with two third guide wheels 40 on each side. The third guide wheels 40 can move forward and backward along the side surface of the boom 1. By moving the second slider 36, the position of the side frame 39 can be adjusted, thereby varying the distance between the side frames 39 according to the width of the boom 1. This allows the third guide wheels 40 on either side of the boom 1 to conform to the two side surfaces of the boom 1, adapting to booms of different widths and allowing them to move along the side surfaces. When the detection device is inspecting the boom 1, the third guide wheels 40 limit the straightness of the entire inspection route to prevent the detection device from deviating during movement.

[0050] Preferably, the lower end of each side frame 39 is connected to a hinged seat 42 via screws. The ends of a third U-shaped frame 43 are fixedly connected to the hinged seats 42 at the lower ends of the two side frames 39 on the same side. The third U-shaped frame 43 serves to increase the rigidity of the side frames 39, preventing the third guide wheel 40 from being subjected to stress during testing, which could cause the side frames 39 to bend and deform due to the suspended connection.

[0051] More preferably, one end of the blocking rod 44 passes through the threaded hole in the center of the third U-shaped frame 43 and abuts against the support frame 3 on the same side, thereby supporting the support frame 3 and preventing the support frame 3 from bending under stress.

[0052] Example 5

[0053] Embodiment 5 of the present invention discloses a surface defect detection device for a crane boom. Figures 1 to 8 As shown, the surface defect detection device of embodiment 5 is the same as embodiment 1, 2, 3 or 4. In addition, embodiment 5 specifically discloses an implementation structure of the bottom detection component.

[0054] Specifically, the third detection component includes a third magnetic sensor array 45. The third magnetic sensor array 45 is disposed within a third sensor housing 46, which may be sealed within the housing 46 using epoxy resin. Third magnets 47 are disposed within grooves at the front and rear ends of the third sensor housing 46 and may be sealed within the housing 46 using epoxy resin. The detection principles of the third magnetic sensor array 45 and the third magnet 47 are the same as those of the first magnetic sensor array 13 and the first magnet 15 described above, and are not further described here.

[0055] The lower end of the side frame 39 on one side is hingedly connected to one end of the semicircular support ring 4, while the lower end of the opposite side frame 39 on the other side is hingedly connected to the other end of the same semicircular support ring 4 via a connector 48. For example, this hinge connection can be achieved via the aforementioned hinge seat 42. That is, when the lower end of the side frame 39 is connected to the hinge seat 42, one end of the semicircular support ring 4 is hingedly connected to the lower end of the hinge seat 42 on one side, and the other end of the same semicircular support ring 4 is hingedly connected to the lower end of the opposite hinge seat 42 on the other side via the connector 48. The connector 48 can be in the form of a hinged hook.

[0056] The position of the connecting member 48 and the lower end of the connected side frame 39 is adjustable. Preferably, when the lower end of the side frame 39 is connected to the hinge seat 42, the position of the connecting member 48 and the hinge seat 42 is adjustable. For example, by providing pins at different heights on the side frame 39 or the hinge seat 42, the hinge position can be adjusted.

[0057] When in use, lift up one end of the semicircular support ring 4 with the connecting piece 48, and the semicircular support ring 4 can be hung on the side frame 39 of the corresponding side or the pin shaft at the lower end of the hinge seat 42 through the connecting piece 48, so that the detection ring embraces the boom 1. In addition, the connecting piece 48 can also be removed from the side frame 39 of the corresponding side or the pin shaft at the lower end of the hinge seat 42 to open the detection ring so that the boom 1 can be removed.

[0058] Each semicircular support ring 4 is provided with a plurality of third guide rods 49. The inner surface of each semicircular support ring 4 is provided with a plurality of third sensor boxes 46, so that the inner surface of the semicircular support ring 4 is covered with the third magnetic sensor array 45 from one end to the other, thereby achieving full coverage detection of the lower surface of the boom 1. It should be understood that the third sensor boxes 46 are also arc-shaped to match the shape of the semicircular support ring 4. The outer surface of each third sensor box 46 is connected to the upper end of at least one third guide rod 49, specifically by threaded engagement. Each third limit plate 50 is connected to the lower end of at least one third guide rod 49, specifically by threaded engagement. Preferably, the outer surface of one third sensor box 46 is connected to the upper ends of two third guide rods 49, and thus, one third limit plate 50 is connected to the lower ends of two third guide rods 49, thereby making the connection more stable. Specifically, each third guide rod 49 can also be set on the semicircular support ring 4 via a third linear bearing 51. Each third linear bearing 51 is fixedly mounted on the outer surface of the semicircular support 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.

[0059] More preferably, when the number of side frames 39 on the same side is at least two, the number of semicircular support rings 4 is also at least two, which are respectively connected to the corresponding side frames 39 on both sides. The third sensor boxes 46 on at least two semicircular support rings 4 are staggered. In a specific embodiment of the present invention, the number of side frames 39 on the same side is two, the number of semicircular support rings 4 is two, and the second sensor box 23 is located between the two semicircular support rings 4. Since there is a gap between the two adjacent third sensor boxes 46 on each semicircular support ring 4, missed detection can be avoided, that is, 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, further achieving full coverage detection of the curved lower surface of the boom 1.

[0060] Preferably, a third compression spring 52 is mounted on each third guide rod 49. The upper end of each third compression spring 52 contacts the outer surface of the corresponding third sensor box 46, and the lower end of each third compression spring 52 contacts the inner surface of the corresponding semicircular support ring 4. The third compression spring 52 applies force to the third sensor box 46. Even if the cross-section of the boom 1 shrinks, the elastic force of the third compression spring 52 allows the position of the third sensor box 46 to be adjusted, so that the third magnetic sensor array 45 can still be in contact with the lower surface of the boom 1.

[0061] Preferably, at least one fourth guide wheel 53 is symmetrically provided on the surfaces of the front and rear ends of each third sensor box 46 to assist the third sensor box 46 in moving in the front and rear directions on the lower surface of the boom 1 .

[0062] The detection device of the above embodiment adopts the leakage magnetic detection technology combined with the actual cross-sectional dimensions of the crane boom 1, and takes into account the differences in the dimensions of different sections of the boom 1 of cranes with the same tonnage. The design of the entire detection device is consistent with the cross-sectional shape of the boom 1. At the same time, the first detection component, the two second detection components and the third detection component correspond to the four surfaces of the boom 1 respectively and are independent of each other. Each independent detection component can realize the fit detection of each surface of the boom 1 by moving and using its own independent compression spring, thereby preventing the influence of the detection lift-off value on the detection signal. At the same time, when the cross-sectional dimensions of the boom 1 change, it can still fit each surface of the boom 1 within a certain range under the action of the compression springs on each surface, so that the detection range of the detection device is wide.

[0063] During use, for example, when the dimensions of the boom 1 of cranes of different tonnages vary greatly, it is assumed that the boom 1 designed to be inspected by the detection device is the boom 1 of an 80t crane. When inspecting the boom 1 of a 50t crane, the cross-sectional dimensions of the boom 1 of the 50t crane must be smaller than the cross-sectional dimensions of the boom 1 of the 80t crane. At this time, the range of variation of the compression spring cannot compensate for the reduced cross-sectional dimensions of the boom 1. In this case, the top detection assembly does not need to be replaced, only the two side detection assemblies will be empty, which has no effect on the detection signal. The first slider 26 can be manually moved toward the center of the boom 1 to reduce the distance between the two side support frames 3 to adapt to the cross-sectional width of the boom 1 of the 50t crane. In addition, by simply replacing the third sensor box 46 with a different radius, the boom 1 of cranes of different tonnages can be inspected. The entire detection device has a larger detection range. At the same time, the entire detection device does not rely on external force and can be fully automatic to detect and collect magnetic field signals of surface defects of the boom 1. By driving the traveling wheels 7 to travel, full coverage detection of the entire boom 1 is achieved, thereby preventing the occurrence of false detection and missed detection of surface defects of the boom 1.

[0064] In summary, the surface defect detection device of the crane boom in the embodiment of the present invention can locate the surface defects of the crane boom and realize fully automated detection. The detection is fast and efficient, and the occurrence of false detection and missed detection of surface defects of the crane boom is prevented. It is of great significance for effectively preventing the occurrence of crane boom breakage accidents and ensuring the safe construction of the crane hoisting and tower assembly of the transmission line.

[0065] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A surface defect detection device for a crane boom, characterized in that: include: a top detection assembly, two side detection assemblies, and a bottom detection assembly; The top detection assembly includes: a support member and a first detection member, wherein the first detection member is arranged on the lower surface of the support member; Each of the side detection assemblies comprises: a support frame and a second detection member, wherein the upper ends of the support frames of the two side detection assemblies are respectively connected to the lower surface of the support member so as to be movable left and right, the two support frames are respectively symmetrically located on the left and right sides of the middle portion of the support member, and the second detection members are respectively provided on the opposite surfaces of the two support frames; The bottom detection assembly includes: at least one semicircular support ring and at least one third detection member, at least one pair of side frames are respectively connected to the lower surface of the support member so as to be movably left and right, at least one pair of side frames are respectively symmetrically located on the left and right sides of the middle part of the support member, both ends of each semicircular support ring are respectively connected to the lower end of each pair of side frames, and the third detection member is arranged on the inner surface of the semicircular support ring; In a detection state, the first detection member, the two second detection members and the third detection member form a detection ring for the crane boom to pass through; The second detection member includes: a second magnetic sensor array, the second magnetic sensor array is arranged in a second sensor box, and second magnets are respectively arranged in grooves at the front and rear ends of the second sensor box; The lower surface of the support member is symmetrically provided with a first linear guide on the left and right sides of the middle part of the support member, each of the first linear guide rails is provided with a movable first slider, the lower surface of each first slider is connected to the upper end of each support frame, each support frame is penetrated by at least one second guide rod, one end of each second guide rod on the same side of each support frame is connected to the outer surface of the second sensor box on the same side, and the other end of the second guide rod at the same height on the same side of each support frame is connected to a second limit plate; Two second linear guides parallel to the first linear guides are symmetrically arranged at the front and rear ends of each of the first linear guides on the lower surface of the support member, each of the second linear guides is provided with a movable second slider, the lower surface of each of the second sliders is connected to a side frame, and at least one third guide wheel is respectively provided on the opposite surfaces of the side frames on the left and right sides; The third detection member includes: a third magnetic sensor array, the third magnetic sensor array is arranged in a third sensor box, and third magnets are arranged in grooves at the front and rear ends of the third sensor box; The lower end of the side frame on one side is hinged to one end of the semicircular support ring, and the lower end of the opposite side frame on the other side is hinged to the other end of the same semicircular support ring through a connecting piece. The position of the connecting piece and the lower end of the connected side frame is adjustable. Each semicircular support ring is penetrated by a plurality of third guide rods, and the inner surface side of each semicircular support ring has a plurality of third sensor boxes. The outer surface of each third sensor box is connected to the upper end of at least one third guide rod, and each third limit plate is connected to the lower end of at least one third guide rod.

2. The surface defect detection device for a crane boom according to claim 1, characterized in that: Four bearing seats are installed on the lower surface of the support member, two bearing seats are symmetrically located at the front end of the first detection member, and the other two bearing seats are symmetrically located at the rear end of the first detection member. A rotatable transmission shaft is provided on the two bearing seats located at the same end, and each transmission shaft is sleeved with at least one walking wheel, and each end of each transmission shaft is sleeved with a driven wheel. Four motors are installed near the four corners in the cavity of the support member, and a driving wheel is sleeved on the output shaft of each motor, and a transmission belt is sleeved on each driving wheel, and each transmission belt passes through the lower surface of the support member and is sleeved on each driven wheel.

3. The surface defect detection device for a crane boom according to claim 1, characterized in that: The first detection member includes: a first magnetic sensor array, the first magnetic sensor array is arranged in a first sensor box, and first magnets are respectively arranged in grooves at the front and rear ends of the first sensor box; At least one first guide rod passes through the upper and lower surfaces of the support member, the upper surface of the first sensor box is connected to the lower end of at least one first guide rod, and the upper end of at least one first guide rod is connected to the first limiting plate.

4. The surface defect detection device for a crane boom according to claim 3, characterized in that: A first compression spring is sleeved on each of the first guide rods, the upper end of the first compression spring contacts the lower surface of the support member, and the lower end of the first compression spring contacts the upper surface of the first sensor box; At least one first U-shaped frame is clamped on the outer surface of the first sensor box, and both ends of the first U-shaped frame are respectively connected to the first guide wheels.

5. The surface defect detection device for a crane boom according to claim 1, characterized in that: A second compression spring is sleeved on each of the second guide rods, one end of each of the second compression springs contacts the outer surface of the second sensor box on the same side, and the other end of each of the second compression springs contacts 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 both ends of the second U-shaped frame are respectively connected to the second guide wheels.

6. The surface defect detection device for a crane boom according to claim 1, characterized in that: A third compression spring is sleeved on each of the third guide rods, the upper end of each of the third compression springs contacts the outer surface of the corresponding third sensor box, and the lower end of each of the third compression springs contacts the inner surface of the corresponding semicircular support ring; At least one fourth guide wheel is symmetrically arranged on the surfaces of the front and rear ends of each of the third sensor boxes.

7. The surface defect detection device for a crane boom according to claim 6, characterized in that: When the number of the semicircular support rings is at least two, the third sensor boxes on at least two of the semicircular support rings are staggered.

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