Device and method for detecting defects of crane jib

Abstract

The invention discloses a crane jib defect detection device and a detection method thereof, and belongs to the technical field of cranes. Comprising walking wheel assemblies, a connecting rod and a detection assembly, the two walking wheel assemblies and the detection assembly are arranged on the connecting rod, and the walking wheel assemblies are located on the two sides of the detection assembly; the walking wheel assembly comprises a roller assembly, a belt I, a driving assembly and a permanent magnet adsorption assembly; a first belt is arranged on the roller assemblies, a driving assembly and a permanent magnet adsorption assembly are arranged between the roller assemblies, and the driving assembly is arranged at the upper end of the permanent magnet adsorption assembly; the detection assembly comprises a traction assembly, a fixing frame, a fixing plate and a detection part; the fixing plate is arranged on the connecting rod through a fixing frame, and a traction assembly and a detection part are arranged on the fixing plate. The device disclosed by the invention is high in sensitivity, capable of detecting the surface and internal defects of the crane jib, free from falling off from the crane jib, flexible and convenient to use.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and particularly relates to a crane boom defect detection device and a method thereof. Background Art

[0002] The crane boom defect is an important component of the crane, and its quality is crucial for ensuring the safe operation of the crane. Defects such as pores, sand holes, inclusions and scratches in the crane boom are likely to cause cracks to expand during the operation of the crane boom, resulting in safety accidents. At present, manual visual inspection is mainly used, supplemented by ultrasonic flaw detection. Manual visual inspection is prone to omissions and low efficiency; ultrasonic is mainly used to detect internal defects. Although it has high sensitivity, its sensitivity to surface defects of the crane is relatively low; and in order to ensure that the existing defect detection device does not fall off the crane boom, the defect detection device is relatively bulky and inflexible.

[0003] Therefore, there is an urgent need for a crane boom defect detection device and a method thereof to solve the above technical problems. Summary of the Invention

[0004] The purpose of the invention is to provide a crane boom defect detection device and a method thereof to solve the above technical problems.

[0005] To achieve the above purpose, the invention provides the following technical solution: A crane boom defect detection device includes a walking wheel assembly, a connecting rod and a detection assembly. There are two walking wheel assemblies and a detection assembly arranged on the connecting rod, and the walking wheel assemblies are located on both sides of the detection assembly; the walking wheel assembly includes a roller assembly, a first belt, a driving assembly and a permanent magnet adsorption assembly; a first belt is arranged on the roller assembly, and a driving assembly and a permanent magnet adsorption assembly are arranged between the roller assemblies, and the driving assembly is arranged above the permanent magnet adsorption assembly; the detection assembly includes a traction assembly, a fixed frame, a fixing plate and a detection part; the fixing plate is arranged on the connecting rod through the fixed frame, and a traction assembly and a detection part are arranged on the fixing plate.

[0006] The traction assembly is arranged on at least one side of the fixing plate, the traction assembly is located outside the detection part, and the traction assembly includes two rotating shafts, at least two traction wheels and at least one second belt; the two rotating shafts are arranged in parallel in the fixing plate, the traction wheels are rotatably arranged on the rotating shafts, and the second belt is rotatably arranged outside the traction wheels.

[0007] The detection part includes a detection sensor, a power supply and a control component; the detection sensor is arranged at a gap at the bottom of the fixing plate; the power supply is electrically connected to the detection sensor and the control component, and the detection sensor and the control component are connected by wire.

[0008] The fixing brackets are arranged on both sides of the fixing plate. The upper ends of the fixing brackets are fixed on the connecting rod, and the lower ends of the fixing brackets are fixed on the upper surface of the fixing plate.

[0009] The roller assembly includes a driving wheel, a driven wheel, a driving disc, a driving shaft, a fixed shaft, an outer fixing plate and an inner fixing plate; both ends of the driving shaft pass through the driving disc and are fixedly provided with driving wheels. The driving disc is fixed on one side of the driving wheel close to the driving shaft; the driven wheel is rotatably arranged at both ends of the fixed shaft, and outer fixing plates are fixed at both ends of the fixed shaft. Inner fixing plates are arranged on the inner sides of the outer fixing plates on both sides; the rear end of the inner fixing plate is fixed on the fixed shaft, the front end of the inner fixing plate is fixed to the driving assembly, and the front ends of the inner fixing plate and the outer fixing plate are fixed through a connecting block; there are gaps between both sides of the driven wheel and the outer fixing plate and the inner fixing plate respectively.

[0010] The first belt is wound around the driving disc and the driven wheel.

[0011] The driving assembly includes a motor, a speed reducer and a speed reducer mounting seat; the motor is connected to the speed reducer, the speed reducer is arranged in the speed reducer mounting seat, and the speed reducer is connected to the driving shaft.

[0012] The permanent magnet adsorption assembly includes a plurality of permanent magnets and a permanent magnet mounting seat. The permanent magnets are fixed to the lower end of the speed reducer mounting seat through the permanent magnet mounting seat.

[0013] Both ends of the connecting rod pass through the outer fixing plate and the inner fixing plate.

[0014] A detection method for a crane boom defect detection device includes the following steps: S1. Adjust the angles of the traveling wheel assembly and the detection assembly; S2. Place the detection device on the crane boom, and the permanent magnets are adsorbed on the crane boom; S3. The motor drives the driving wheel through the driving shaft connected to the speed reducer, and the first belt rotates on the driving disc and the driven wheel; S4. The detection sensor picks up signals from the contact surface of the crane boom, and the control component transmits the analog-to-digital conversion of the data.

[0015] Compared with the prior art, the beneficial effects of the present invention are: By setting the traveling wheel assembly and the detection assembly, the present invention enables the detection device to perform detection while traveling, improving the detection efficiency; The driving assembly of the present invention drives the driving wheel to rotate, and the first belt rotates, enabling the detection device to travel. Moreover, the setting of the first belt enables the device to travel smoothly on contact surfaces with different heights, preventing the internal structure of the traveling wheel assembly from being exposed and reducing the service life; The permanent magnet adsorption component of the present invention adsorbs to the crane boom, so that when the traveling wheel assembly is moving, the driven wheel is always above the driving wheel, so that the detection component on the connecting rod always maintains the initial setting direction to detect the crane boom; The traction component of the present invention can make the detection component move more conveniently on the crane boom. When any one of the traction wheels in the traction component fails, the rotation of the remaining traction wheels will not affect the traction effect of the traction component, ensuring the movement of the detection component; The detection part of the present invention has very high sensitivity and can detect the surface and internal defects of the crane boom; The fixed frame of the present invention has a stable structure, ensuring that the detection component is firmly arranged on the connecting rod, and can also reduce the weight of the detection device and the production cost; The device of the present invention has high sensitivity, can detect the surface and internal defects of the crane boom, will not fall off from the crane boom, is flexible and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a device and method for detecting defects of a crane boom; Figure 2 It is a cross-sectional schematic diagram of a device and method for detecting defects of a crane boom; Figure 3 It is a bottom schematic diagram of the detection component; In the figure: 1. Traveling wheel assembly; 11. Roller assembly; 111. Driving wheel; 112. Driven wheel; 113. Driving disc; 114. Driving shaft; 115. Fixed shaft; 116. Outer fixing plate; 117. Inner fixing plate; 12. Belt 1; 13. Driving component; 131. Motor; 132. Reducer; 133. Reducer mounting seat; 14. Permanent magnet adsorption component; 141. Permanent magnet; 142. Permanent magnet mounting seat; 2. Connecting rod; 3. Detection component; 31. Traction component; 311. Rotating shaft; 312. Traction wheel; 313. Belt 2; 32. Fixed frame; 33. Fixing plate; 34. Detection part; 341. Detection sensor; 342. Power supply; 343. Control part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 - 3, the present invention provides a technical solution: a crane boom defect detection device, including a walking wheel assembly 1, a connecting rod 2 and a detection assembly 3. There are two walking wheel assemblies 1 and a detection assembly 3 provided on the connecting rod 2, and the walking wheel assemblies 1 are located on both sides of the detection assembly 3; the walking wheel assembly 1 includes a roller assembly 11, a first belt 12, a driving assembly 13 and a permanent magnet adsorption assembly 14; a first belt 12 is provided on the roller assembly 11, and a driving assembly 13 and a permanent magnet adsorption assembly 14 are provided between the roller assemblies 11, and the driving assembly 13 is arranged at the upper end of the permanent magnet adsorption assembly 14; the detection assembly 3 includes a traction assembly 31, a fixing frame 32, a fixing plate 33 and a detection part 34; the fixing plate 33 is arranged on the connecting rod 2 through the fixing frame 32, and a traction assembly 31 and a detection part 34 are provided on the fixing plate 33.

[0019] Further, the walking wheel assemblies 1 are fixedly arranged at both ends of the connecting rod 2 for the walking of the detection device; the detection assembly 3 is fixedly arranged in the middle of the connecting rod 2, and the bottom surface of the detection assembly 3 is arranged parallel to the horizontal plane for detecting the crane boom.

[0020] The permanent magnet adsorption assembly 14 is arranged at the lower end of the driving assembly 13, and the permanent magnet adsorption assembly 14 has an adsorption effect on the lower end of the crane boom. When the device of the present invention moves forward, the driving assembly 13 and the permanent magnet adsorption assembly 14 are in a static state relative to the roller assembly 11. At this time, the driving assembly 13 and the permanent magnet adsorption assembly 14 are arranged parallel to the surface of the crane boom.

[0021] The roller assembly 11 includes a driving wheel 111, a driven wheel 112, a driving disc 113, a driving shaft 114, a fixed shaft 115, an outer fixing plate 116 and an inner fixing plate 117; both ends of the driving shaft 114 pass through the driving disc 113 and are fixedly provided with driving wheels 111, and the driving disc 113 is fixed on the side of the driving wheel 111 close to the driving shaft 114; the driven wheel 112 is rotatably arranged at both ends of the fixed shaft 115, and outer fixing plates 116 are fixed at both ends of the fixed shaft 115, and inner fixing plates 117 are arranged on the inner sides of the outer fixing plates 116 on both sides; the rear end of the inner fixing plate 117 is fixed on the fixed shaft 115, the front end of the inner fixing plate 117 is fixed to the driving assembly 13, and the front ends of the inner fixing plate 117 and the outer fixing plate 116 are fixed through a connecting block; there are gaps between both sides of the driven wheel 112 and the outer fixing plate 116 and the inner fixing plate 117 respectively.

[0022] Furthermore, the driving wheel 111 is a rubber wheel, which can increase the friction between the driving wheel 111 and the crane boom, so that the detection component 3 between the walking wheel assembly 1 has sufficient time to detect the crane boom; at the same time, the rubber material is elastic, so that when the driving wheel 111 is moving, the permanent magnet in the roller assembly 11 adsorbs the crane boom, and the driving wheel 111 has deformation space.

[0023] Furthermore, the driving disc 113 is fixed on both sides of the driving shaft 114, and the driving disc 113 is fixed on the inner side of the driving wheel 111, so that when the driving shaft 114 rotates, the driving discs 113 on both sides are driven to rotate, thereby rotating the driving wheel 111 and causing the walking wheel assembly 1 to move.

[0024] Furthermore, the diameter of the driving disc 113 is smaller than the diameter of the driving wheel 111, so that when the driving wheel 111 rotates, the driving disc 113 will not directly contact the surface of the crane boom.

[0025] Furthermore, the material of the driving disk 113 is preferably a material that avoids affecting the permanent magnet, such as aluminum, aluminum magnetic alloy, etc.

[0026] The material of the passive wheel 112 is preferably a material that avoids affecting the permanent magnet, ensuring that the permanent magnet is only adsorbed on the crane boom. It can be preferably a rubber wheel, an aluminum wheel, or an aluminum magnetic alloy wheel, etc. according to production cost or use effect.

[0027] The two ends of the fixed shaft 115 are fixed on the inner wall of the outer fixed plate 116, and the inner fixed plate 117 is fixed on the fixed shaft 115, so that the outer fixed plate 116 and the inner fixed plate 117 have space for arranging the passive wheel 112, and there are gaps between the two sides of the passive wheel 112 and the outer fixed plate 116 and the inner fixed plate 117 respectively, so that the passive wheel 112 can rotate.

[0028] Furthermore, there is a gap between the front end of the outer fixing plate 116 and the driving wheel 111, so that when the driving wheel 111 rotates, there will be no friction between the outer fixing plate 116. The front end of the outer fixing plate 116 is fixed to the inner fixing plate 117, and the rear end of the outer fixing plate 116 is fixed to the fixed shaft 115, so that the outer fixing plate 116 can be set on the outside of the roller assembly 11, and the structure inside the roller assembly 11 can be closed from both sides.

[0029] Furthermore, the front end of the inner fixing plate 117 is fixed to the outer walls on both sides of the driving assembly 13 , and the rear end of the inner fixing plate 117 is fixed to the fixed shaft 115 , so that the driving assembly 13 is fixed between the driving wheels 111 .

[0030] The first belt 12 is wound around the driving disc 113 and the driven wheel 112. During operation, when the driving wheel 111 rotates, the driving disc 113 is driven to rotate, and the first belt 12 rotates around the outer circles of the driving disc 113 and the driven wheel 112. The arrangement of the first belt 12 enables an increase in the contact area between the device of the present invention and the crane boom during crawling, allowing the device of the present invention to transmit more smoothly when moving forward. Especially for contact surfaces with different heights, it can move forward smoothly. At the same time, the relatively wide first belt 12 can enclose the internal structure of the walking wheel assembly 1, preventing the exposure of each internal structure and reducing the service life.

[0031] The driving assembly 13 can supply energy to the walking wheel assembly 1. The driving assembly 13 includes a motor 131, a speed reducer 132, and a speed reducer mounting base 133; the motor 131 is connected to the speed reducer 132, the speed reducer 132 is arranged within the speed reducer mounting base 133, and the speed reducer 132 is connected to the driving shaft 114.

[0032] Further, the speed reducer mounting base 133 includes a speed reducer mounting frame and a mounting lower base. The upper end of the mounting lower base fixes the speed reducer mounting frame, and the lower end of the mounting lower base fixes the permanent magnet adsorption assembly 14; the speed reducer 132 is arranged within the speed reducer mounting frame, and the motor 131 is arranged at the rear end of the speed reducer mounting frame; the speed reducer mounting base 133 integrates the motor 131, the speed reducer 132, and the permanent magnet adsorption assembly 14.

[0033] Further, the material of the speed reducer mounting base 133 is preferably a material that does not affect the permanent magnet, such as aluminum, aluminum magnetic alloy, etc.

[0034] The permanent magnet adsorption assembly 14 includes a plurality of permanent magnets 141 and a permanent magnet mounting base 142. The permanent magnets 141 are fixed to the lower end of the speed reducer mounting base 133 via the permanent magnet mounting base 142.

[0035] The permanent magnet adsorption assembly 14 is located in the middle of the permanent magnet adsorption assembly 14.

[0036] Further, the permanent magnet mounting base 142 includes a permanent magnet mounting frame and a mounting upper base. The mounting upper base is fixed to the mounting lower base, the lower end of the mounting upper base fixes the permanent magnet mounting frame, and a plurality of permanent magnets are fixedly arranged on the permanent magnet mounting frame. There is an air gap between the permanent magnets and the crane boom.

[0037] Further, the material of the permanent magnet mounting base 142 is preferably a material that does not affect the permanent magnet, such as aluminum, aluminum magnetic alloy, etc.

[0038] The number of the permanent magnets can be increased or decreased according to requirements so that the permanent magnets can be adsorbed on the crane boom. During use, the traveling wheel assembly 1 contacts the crane boom through the driving wheel 111. There is an adsorption force between the permanent magnet adsorption assembly 14 in the middle of the driving wheel 111 and the crane boom, and the adsorption force deforms the rubber driving wheel 111; at the same time, the compression deformation of the driving wheel 111 causes the air inside the driving wheel 111 to be squeezed, the air pressure rises, the stiffness of the driving wheel 111 increases, which hinders the further compression deformation of the driving wheel 111, and finally realizes the balance between the adsorption force and the deformation of the driving wheel 111.

[0039] The setting of the permanent magnet adsorption assembly 14 enables the detection device to keep the driven wheel 112 always above the driving wheel 111 regardless of whether the traveling direction is forward or backward, upward or downward, so that the detection assembly 3 on the connecting rod 2 always maintains the initial setting direction to detect the crane boom.

[0040] Both ends of the connecting rod 2 are arranged through the outer fixing plate 116 and the inner fixing plate 117.

[0041] Further, both ends of the connecting rod 2 are sequentially arranged through the outer fixing plate 116, the inner fixing plate 117, the inner fixing plate 117 and the outer fixing plate 116, and the connecting rod 2 extends out of the outer fixing plate 116. A nut is fastened at the connection between the connecting rod 2 and the outer fixing plate 116. The traveling wheel assemblies 1 are arranged at both ends of the connecting rod 2, and the traveling wheel assemblies 1 on both sides move synchronously.

[0042] The fixing frame 32 is arranged on both sides of the fixing plate 33. The upper end of the fixing frame 32 is fixed on the connecting rod 2, and the lower end of the fixing frame 32 is fixed on the upper surface of the fixing plate 33.

[0043] Further, the fixing frame 32 is of a triangular structure. The top of the triangular structure is fixed on the connecting rod 2, and the bottom of the triangular structure is fixed on both sides of the upper end of the fixing plate 33.

[0044] Further, in order to reduce the weight of the fixing frame 32, the fixing frame 32 can adopt a hollow triangular structure, which can ensure the stability of the fixation of the detection assembly 3, can also reduce the weight of the detection device, and reduce the production cost.

[0045] The traction assembly 31 is at least arranged on one side of the fixing plate 33. The traction assembly 31 is located outside the detection part 34. The traction assembly 31 includes two rotating shafts 311, at least two traction wheels 312 and at least one second belt 313; the two rotating shafts 311 are arranged in parallel in the fixing plate 33, the traction wheels are rotatably arranged on the rotating shafts 311, and the second belt 313 is rotatably arranged outside the traction wheels 312.

[0046] Further, the traction assemblies 31 are arranged on the front and rear sides of the fixed plate 33. When the traction assemblies 31 are moving forward, the traction assemblies 31 on the front and rear sides rotate, reducing the hysteresis of the traction assemblies 31, so that both sides of the detection assembly 3 are pulled. The traction assemblies 31 can move forward together with the walking wheel assemblies 1 on both sides.

[0047] At least one opening and a sensor mounting groove are provided on the fixed plate 33. The opening is arranged on one side of the fixed plate 33, and the traction assembly 31 is arranged in the opening. The number and structural size of the openings are adapted to the traction assembly 31; the sensor mounting groove is provided at the lower surface of the fixed plate 33 at intervals.

[0048] Further, the fixed plate 33 is made of a non-magnetic material, so as not to have a significant impact on the magnetic sensor.

[0049] Further, the rotating shaft 311 is rotatably arranged in the opening on the fixed plate 33. In the embodiment of the present invention, a plurality of traction wheels 312 are arranged at intervals on the same rotating shaft 311, and a second belt 313 is rotatably arranged on two parallel traction wheels 312. The plurality of traction wheels 312 and the second belt 313 arranged at intervals make the traction efficiency of the traction assembly 31 high. Especially when any one of the traction wheels 312 fails, the rotation of the remaining traction wheels 312 will not affect the traction effect of the traction assembly 31, ensuring the movement of the detection assembly 3.

[0050] The detection part 34 includes a detection sensor 341, a power supply 342 and a control part 343; the detection sensor 341 is arranged at the bottom of the fixed plate 33 at intervals; the power supply 342 is electrically connected to the detection sensor 341 and the control part 343, and the detection sensor 341 and the control part 343 are connected by wire.

[0051] Further, the detection sensor 341 is arranged in the sensor mounting groove of the fixed plate 33, and the detection sensor 341 is used for defect detection of the crane boom.

[0052] Further, a Hall sensor, a rare earth permanent magnet, a magnetic yoke, a magnetic concentrating body, and a high magnetic permeability material are arranged in the detection sensor 341. When the Hall sensor senses the crane boom, it passes through the high magnetic permeability material to the rare earth permanent magnet and the magnetic yoke, and then returns to the crane boom through the magnetic concentrating body to form a magnetic circuit for defect detection. When the Hall sensor changes, the original magnetic balance is broken, and the Hall sensor generates an output signal; the crane boom is detected by measuring the change in magnetic resistance, and the size of the defect is in direct proportion to the amount of change in magnetic resistance.

[0053] A detection method for a crane boom defect detection device includes the following steps: S1. Adjust the angles of the walking wheel assembly 1 and the detection assembly 3; S2. Place the detection device on the crane boom, and the permanent magnet 141 is adsorbed on the crane boom; S3. The motor 131 drives the driving wheel 111 through the drive shaft 114 connected to the speed reducer 132, and the first belt 12 rotates on the drive disc 113 and the driven wheel 112; S4. The detection sensor 341 picks up signals from the contact surface of the crane boom, and the control member 343 transmits the analog-to-digital conversion of the data.

[0054] Further, in S1, by adjusting the fastening nut at the junction of the connecting rod 2 and the outer fixing plate 116, the walking wheel assembly 1 can move, and the angle of the walking wheel assembly 1 is adjusted so that the bottom end of the detection assembly 3 is parallel to the crane boom. The permanent magnet adsorption assembly 14 in the walking wheel assembly 1 is located above the crane boom to adsorb the crane boom.

[0055] Further, during the movement of the driving wheel 111, the permanent magnet 141 is always adsorbed on the crane boom.

[0056] Further, the magnetic lines of force when the N pole of the permanent magnet in the detection sensor 341 enters the crane boom are propagated along two paths. One part directly returns to the S pole along the crane boom, and the other part returns to the S pole through the magnetic circuit composed of high-permeability materials and magnetic concentrating bodies.

[0057] Further, the detection sensor 341 is used to pick up damage signals of the crane boom; a data acquisition single-chip microcomputer and a communication structure are provided in the control member 343. The data acquisition single-chip microcomputer completes the analog-to-digital conversion of the data of the detection sensor 341. The communication structure converts the data signal into the CAN bus mode and is converted into a USB signal for transmission to an external computer after transmission; the computer is responsible for collecting and processing data, displaying graphics, storing data, analyzing and judging the defect type, locating the damage position, and generating a detection report; the power supply 342 provides energy for the detection sensor 341 and the control member 343.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crane boom defect detection device, characterized in that: The invention comprises a walking wheel assembly (1), a connecting rod (2) and a detection assembly (3); the connecting rod (2) is provided with two walking wheel assemblies (1) and a detection assembly (3); the walking wheel assembly (1) is located on both sides of the detection assembly (3); the walking wheel assembly (1) comprises a roller assembly (11), a belt (12), a driving assembly (13) and a permanent magnetic adsorption assembly (14); the roller assembly (11) is provided with a belt (12); the driving assembly (13) and the permanent magnetic adsorption assembly (14) are provided between the roller assemblies (11); the driving assembly (13) and the permanent magnetic adsorption assembly (14) are provided at the upper end of the permanent magnetic adsorption assembly (14); the detection assembly (3) comprises a traction assembly (31), a fixing frame (32), a fixing plate (33) and a detection unit (34); the fixing plate (33) is provided on the connecting rod (2) via the fixing frame (32); the traction assembly (31) and the detection unit (34) are provided on the fixing plate (33).

2. A crane boom defect detection device according to claim 1, characterized in that: The traction assembly (31) is at least arranged on one side of the fixed plate (33). The traction assembly (31) is located outside the detection portion (34). The traction assembly (31) comprises two rotating shafts (311), at least two traction wheels (312) and at least one second belt (313). The two rotating shafts (311) are arranged in parallel inside the fixed plate (33). A traction wheel is rotatably arranged on the rotating shaft (311), and a second belt (313) is rotatably arranged outside the traction wheel (312).

3. A crane boom defect detection device according to claim 1, characterized in that: The detection portion (34) comprises a detection sensor (341), a power source (342) and a control element (343); the detection sensor (341) is disposed at a gap at the bottom of the fixing plate (33); the power source (342) and the detection sensor (341) and the control element (343) are electrically connected, and the detection sensor (341) and the control element (343) are connected via a wire.

4. A crane boom defect detection device according to claim 1, characterized in that: The fixing frame (32) is arranged on both sides of the fixing plate (33), the upper end of the fixing frame (32) is fixed on the connecting rod (2), and the lower end of the fixing frame (32) is fixed on the upper surface of the fixing plate (33).

5. A crane boom defect detection device according to claim 1, characterized in that: The roller assembly (11) comprises a driving wheel (111), a driven wheel (112), a driving disk (113), a driving shaft (114), a fixed shaft (115), an outer fixed plate (116) and an inner fixed plate (117); both ends of the driving shaft (114) pass through the driving disk (113) and are fixedly provided with driving wheels (111); the driving disk (113) is fixed to a side of the driving wheel (111) close to the driving shaft (114); the driven wheel (112) is rotatably provided at both ends of the fixed shaft (115) and is fixed The ends of both ends of the shaft (115) are fixed with outer fixing plates (116), and inner fixing plates (117) are arranged inside the outer fixing plates (116) on both sides; the rear end of the inner fixing plate (117) is fixed to the fixed shaft (115), the front end of the inner fixing plate (117) is fixed to the driving assembly (13), and the inner fixing plate (117) and the front end of the outer fixing plate (116) are fixed via a connecting block; and there are gaps between the two sides of the passive wheel (112) and the outer fixing plate (116) and the inner fixing plate (117), respectively.

6. A crane boom defect detection device according to claim 5, characterized in that: The belt 1 (12) is arranged around the driving disc (113) and the driven wheel (112).

7. A crane boom defect detection device according to claim 1, characterized in that: The driving assembly (13) comprises a motor (131), a reducer (132) and a reducer mounting seat (133); the motor (131) and the reducer (132) are connected, the reducer (132) is arranged in the reducer mounting seat (133), and the reducer (132) and the driving shaft (114) are connected.

8. The crane boom defect detection device according to claim 1, characterized in that: The permanent magnet adsorption component (14) comprises a plurality of permanent magnets (141) and a permanent magnet mounting seat (142); the permanent magnets (141) are fixed to the lower end of the reducer mounting seat (133) via the permanent magnet mounting seat (142).

9. The crane boom defect detection device according to claim 1, characterized in that: Two ends of the connecting rod (2) are arranged through an outer fixing plate (116) and an inner fixing plate (117).

10. A method for detecting a crane boom defect detection device, using the detection device as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1. Adjusting the angles of the walking wheel assembly (1) and the detection assembly (3); S2. The detection device is placed on the crane boom, and the permanent magnet (141) is adsorbed on the crane boom; S3. The motor (131) drives the driving wheel (111) through the drive shaft (114) connected to the reducer (132), and the belt (12) rotates on the driving disc (113) and the driven wheel (112); S4. The detection sensor (341) picks up signals from the contact surface of the crane boom, and the control component (343) converts the data into analog-to-digital signals for transmission.

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