Device for detecting failure of I-shaped steel of single-girder hoisting machinery

Abstract

The invention provides a single-girder hoisting machinery I-shaped steel failure detection device, and belongs to the technical field of I-shaped steel detection. A guide rail mechanism is arranged at the top of the base, a fixed body and a movable body are arranged on two sides of the base respectively, the fixed body is mounted at the end of the guide rail mechanism, and the movable body is slidably connected with the guide rail mechanism. Driving roller mechanisms are arranged on the inner side walls of the fixed machine body and the movable machine body correspondingly. Bearing roller mechanisms are arranged at the two ends of the machine base correspondingly. A high-precision laser range finder A and a high-precision laser range finder B are arranged on each of the fixed machine body and the movable machine body. The device can replace manual high-altitude operation to reduce the safety risk, synchronously measure the abrasion loss of the I-shaped steel web and the lower flange, collect the welding seam image, associate the abrasion and the position through the roller type encoding meter to improve the efficiency precision, adapt to multi-specification I-shaped steel through an adjustable structure, and provide a supervision basis to restrain illegal replacement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of I-beam detection, and in particular to a single-girder hoisting machinery I-beam failure detection device. BACKGROUND

[0002] Single-girder hoisting machinery is widely used in the field of enterprise production due to its simple operation and low cost, accounting for about 20% of the total use of hoisting machinery. The I-beam of the main girder, as the running track of the electric hoist, is prone to wear, corrosion, weld crack and main girder deflection failure after long-term use, among which the wear of the web (waist thickness) and the lower flange (wheel tread) is particularly prominent. Usually, it may reach the scrap condition after 2-3 years of use.

[0003] The current detection of such hoisting machinery I-beam has significant defects: traditional inspection relies on manual measurement by using a lifting platform or erecting a scaffold, which is high-risk and low-efficiency for high-altitude operation, and it is difficult to locate the wear position and has poor detection accuracy. At the same time, according to the "TSG51-2023 Safety Technical Regulations for Hoisting Machinery", the replacement of the I-beam after wear is a major repair, which needs to be handled by the "Special Equipment Safety Law of the People's Republic of China" for start-up notification, but in practice, private replacement is common, which has serious safety hazards and regulatory loopholes.

[0004] Existing related detection technologies also cannot meet the needs: for example, a track center detector is disclosed in Chinese Patent Publication No. 118004230A, which can automatically move along the track, mark the center line and avoid obstacles, but its core is focused on track center line detection, and it does not involve I-beam wear measurement and weld defect identification, so it cannot adapt to the failure detection scene of hoisting machinery I-beam; for another example, a I-beam girder detection device and method based on a unmanned aerial vehicle are disclosed in Chinese Patent Publication No. CN120445119A, which can realize high-altitude I-beam girder size and deflection detection, but it relies on unmanned aerial vehicle transfer, which is difficult to realize continuous movement detection of hoisting machinery I-beam, and it does not design special measurement structure for key wear parts such as web and lower flange, and lacks precise recording function of wear position.

[0005] It can be seen that there is an urgent need in the industry for a high-efficiency detection device that can replace manual high-altitude operation, simultaneously detect the wear of the web and lower flange of the I-beam, record the wear position, and adapt to the scene of single-girder hoisting machinery, in order to solve the technical defects of low inspection efficiency, high safety risk and regulatory difficulty in the existing technology. SUMMARY

[0006] The purpose of the present application is to overcome the deficiencies of low inspection efficiency, high safety risk and regulatory difficulty in the prior art, and to provide a single-girder hoisting machinery I-beam failure detection device.

[0007] The application is realized by the technical scheme as follows: a single main girder hoisting machinery I-beam failure detection device, comprising a base; a guide rail mechanism is arranged on the top of the base, fixed bodies and mobile bodies are arranged on both sides of the base and located at both ends of the guide rail mechanism, the fixed body is installed at the end of the guide rail mechanism, and the mobile body is in sliding connection with the guide rail mechanism; drive roller mechanisms are arranged on the inner side walls of the fixed body and the mobile body respectively, supporting roller mechanisms are arranged below the drive roller mechanisms at both ends of the base; the working part of the drive roller mechanism can contact the top surface of the lower flange of the I-beam, the working part of the supporting roller mechanism can contact the bottom surface of the lower flange, the drive roller mechanism and the supporting roller mechanism can form clamping positioning of the lower flange, and the drive roller mechanism can drive the base to move along the length direction of the I-beam; high-precision laser range finders A and high-precision laser range finders B are arranged on the fixed body and the mobile body, the high-precision laser range finder A corresponding to the side surface of the web plate of the I-beam can measure the thickness of the web plate, and the high-precision laser range finder B corresponding to the top surface of the lower flange can measure the thickness of the lower flange.

[0008] The device can directly replace the high-altitude operation mode of traditional manual riding of the lifting platform / foot scaffold, eliminate the device high-altitude falling hidden danger through clamping positioning+automatic walking, and reduce the safety risk of the inspection personnel; meanwhile, the web plate and the lower flange part most prone to wear of the I-beam are synchronously measured, the inefficiency of point-by-point manual measurement is avoided, the detection efficiency is greatly improved, the high-precision characteristics of laser ranging solve the problem of poor precision of traditional visual measurement, and reliable data support is provided for subsequent wear judgment and supervision.

[0009] Further improvement of the application is that the guide rail mechanism comprises two linear modules, the two linear modules are symmetrically arranged at both ends of the base, and the mobile body is installed on the slider of the linear module.

[0010] Further improvement of the application is that the extension direction of the linear module is perpendicular to the walking direction of the base along the I-beam.

[0011] Further improvement of the application is that the fixed body and the mobile body are each provided with a camera, and the camera is used for image acquisition of the I-beam.

[0012] Further improvement of the application is that the two high-precision laser range finders A, the two high-precision laser range finders B and the two cameras are symmetrically arranged.

[0013] Further improvement of the application is that the high-precision laser range finders A, the high-precision laser range finders B and the cameras on the fixed body and the mobile body are sequentially and spacedly arranged along the length direction of the I-beam.

[0014] Further improvements of the present application are that the high-precision laser range finder A and the camera are both installed on the top of the fixed body and the moving body through the connecting rod module, and the high-precision laser range finder B is installed on the top of the inner side wall of the fixed body and the moving body through the telescopic plate.

[0015] Further improvements of the present application are that the two driving roller mechanisms and the two supporting roller mechanisms are symmetrically arranged.

[0016] Further improvements of the present application are that the driving roller mechanism comprises two driving rollers, and the two driving rollers are respectively installed at the two ends of the fixed body and the moving body.

[0017] Further improvements of the present application are that the supporting roller mechanism is a roller type encoder.

[0018] From the above technical solutions, the beneficial effects of the present application are: 1. The device completely replaces the detection mode of manually riding the lifting platform or erecting the scaffold through the clamping and positioning design of the driving roller mechanism and the supporting roller mechanism and the cooperation with the automatic walking function, not only eliminates the double safety hazards of device falling and personnel falling, but also avoids the tedious process of frequently moving the lifting equipment, fundamentally reduces the safety risk of the inspection personnel, and ensures the safety of the high-altitude operation.

[0019] 2. The device can synchronously complete the web and lower flange wear measurement and weld seam image collection without switching detection items in stages; the symmetric arrangement of the high-precision laser range finder can reduce the single-side measurement error, the roller type encoder can accurately associate the wear data with the I-beam position, solves the problems of low efficiency of traditional manual point-by-point measurement and no traceable basis for data, greatly improves the detection efficiency, provides reliable data support for wear degree judgment, and avoids misjudgment and missed judgment due to insufficient accuracy.

[0020] 3. The device can store the visual image through the camera and the position data recorded by the encoder, which can be used as an objective basis for I-beam detection and replacement, effectively suppresses the illegal behavior of privately replacing the I-beam, and perfects the supervision procedure; the adjustable structures such as the guide rail mechanism and the connecting rod module can adapt to I-beams of different widths and wear trace positions, do not need to configure special detection devices for different specifications of equipment, reduce the detection cost of enterprises, and significantly improve the application range and practical value of the device. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of a specific embodiment of the present application.

[0023] Figure 2 is a structural schematic diagram of a driving roller mechanism and a supporting roller mechanism of a specific embodiment of the present application.

[0024] Figure 3 is a detection operation demonstration diagram of a specific embodiment of the present application.

[0025] In the figure: 1, base; 2, guide rail mechanism; 201, linear module; 3, fixed body; 4, moving body; 5, driving roller mechanism; 501, driving roller; 6, supporting roller mechanism; 7, high-precision laser range finder A; 8, high-precision laser range finder B; 9, camera; 10, connecting rod module; 11, telescopic plate; 12, I-beam. DETAILED DESCRIPTION

[0026] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be clearly and completely described below in combination with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present patent.

[0027] Reference will now be made to Figures 1-3 , and specific embodiments will be described as follows: The I-beam failure detection device of a single main girder hoisting machinery according to the present application comprises a base 1; a guide rail mechanism 2 is arranged on the top of the base 1; a fixed body 3 and a moving body 4 are respectively arranged on the two sides of the base 1 and located at the two ends of the guide rail mechanism 2; the fixed body 3 is installed at the end of the guide rail mechanism 2; the moving body 4 is in sliding connection with the guide rail mechanism 2; the guide rail mechanism 2 can drive the moving body 4 to move along the width direction of the I-beam 12; driving roller mechanisms 5 are respectively arranged on the inner side walls of the fixed body 3 and the moving body 4; supporting roller mechanisms 6 are respectively arranged at the two ends of the base 1 and located below the driving roller mechanisms 5; the working part of the driving roller mechanism 5 can contact the top surface of the lower flange of the I-beam 12; the working part of the supporting roller mechanism 6 can contact the bottom surface of the lower flange; the driving roller mechanism 5 and the supporting roller mechanism 6 can form clamping positioning of the lower flange; the driving roller mechanism 5 can drive the base 1 to move along the length direction of the I-beam 12; high-precision laser range finders A 7 and high-precision laser range finders B 8 are arranged on the fixed body 3 and the moving body 4; the high-precision laser range finder A 7 corresponding to the side surface of the web of the I-beam 12 can measure the thickness of the web; the high-precision laser range finder B 8 corresponding to the top surface of the lower flange can measure the thickness of the lower flange.

[0028] In use, first, the mobile body 4 is driven to slide along the width direction of the I-beam 12 by the guide rail mechanism 2 at the top of the base 1, the distance between the fixed body 3 and the mobile body 4 is adjusted, and the two are adapted to the width of the I-beam 12 to be detected; then the drive roller mechanism 5 on the inner side wall of the fixed body 3 and the mobile body 4 cooperates with the supporting roller mechanism 6 at the corresponding position of the two ends of the base 1 to respectively contact and form clamping positioning from the top surface and the bottom surface of the lower flange of the I-beam 12, so as to avoid the device from falling off the high-altitude I-beam; the drive roller mechanism 5 is started, which drives the base 1 as a whole to move along the length direction of the I-beam 12 through the friction with the top surface of the lower flange, and the high-precision laser range finder A7 on the fixed body 3 and the mobile body 4 is aligned with the web side of the I-beam 12, and the high-precision laser range finder B8 is aligned with the top surface of the lower flange, so as to synchronously measure the real-time thickness of the web and the lower flange, i.e. the thickness after wear.

[0029] The device can directly replace the high-altitude operation mode of traditional manual riding of the lifting platform / foot scaffold, eliminate the hidden danger of falling off the device at high altitude through "clamping positioning + automatic walking", and reduce the safety risk of the inspector; at the same time, the web and the lower flange part of the I-beam 12 which are most prone to wear are synchronously measured, the inefficiency of point-by-point manual measurement is avoided, the detection efficiency is greatly improved, and the high-precision characteristics of laser ranging solve the problem of poor precision of traditional visual measurement, providing reliable data support for subsequent wear judgment and supervision.

[0030] Specifically, referring to Figure 2 , the guide rail mechanism 2 comprises two linear modules 201, and the two linear modules 201 are symmetrically arranged at the two ends of the base 1, and the mobile body 4 is installed on the sliding block of the linear module 201.

[0031] The guide rail mechanism 2 adopts two linear modules 201 symmetrically arranged at the two ends of the base 1, and the mobile body 4 is fixed on the sliding block of the linear module 201; when it is necessary to adapt to I-beams 12 of different widths, the linear module 201 drives the sliding block to move along the module track, thereby driving the mobile body 4 to approach or move away from the fixed body 3, so as to adapt to I-beams 12 of different widths.

[0032] The device ensures that the mobile body 4 slides uniformly and stably in force and trajectory through the symmetrically arranged linear modules 201, and avoids body deviation caused by unilateral adjustment; compared with the manual adjustment of the distance between the bodies, the automatic adjustment of the linear module greatly shortens the adaptation time, and can accurately adapt to single-girder crane I-beams of different specifications, thereby improving the universality of the device.

[0033] Specifically, the extension direction of the linear module 201 is perpendicular to the walking direction of the base 1 along the I-beam 12.

[0034] The extension direction of the linear module 201 is perpendicular to the walking direction of the base 1 along the I-beam 12. That is, the linear module 201 only drives the moving body 4 in the direction "perpendicular to the length of the I-beam", that is, along the width direction of the I-beam, to ensure that the adjustment trajectory of the moving body 4 is always consistent with the width direction of the I-beam 12 and there will be no deviation along the walking direction.

[0035] This device, by limiting the direction as described above, can avoid trajectory deviation during the adjustment of the moving fuselage 4, ensuring that the fixed fuselage 3 and the moving fuselage 4 are always symmetrically distributed on both sides of the I-beam 12. This ensures that the subsequent high-precision laser rangefinders A and B can accurately align with the web and lower wing flange measurement positions, avoiding measurement errors caused by fuselage offset and further improving detection accuracy.

[0036] Specifically, refer to Figure 1 and Figure 2 Both the fixed body 3 and the mobile body 4 are equipped with cameras 9, which are used for image acquisition of the I-beam 12.

[0037] Cameras 9 are added to the fixed body 3 and the movable body 4. When the drive roller mechanism 5 drives the base 1 to move along the I-beam 12, the camera 9 simultaneously captures images of the surface of the I-beam 12, especially the weld area, and records the appearance of the weld in real time.

[0038] This device adds a "visual inspection of weld defects" function to the "wear measurement" function, eliminating the need for inspection personnel to visually inspect weld cracks, corrosion and other defects from high altitudes, thus completely eliminating the safety risks of high-altitude visual operations; at the same time, the image acquisition can retain inspection records, solving the problem of traditional manual inspection having no objective image evidence, and providing visual support for subsequent supervision and traceability.

[0039] Specifically, refer to Figure 1 and Figure 2 The two high-precision laser rangefinders A7, the two high-precision laser rangefinders B8, and the two cameras 9 are all arranged symmetrically.

[0040] Two high-precision laser rangefinders A7, two high-precision laser rangefinders B8, and two cameras 9 are symmetrically arranged on the fixed fuselage 3 and the moving fuselage 4 with the longitudinal centerline of the I-beam 12 as the axis of symmetry, respectively. During inspection, the symmetrical rangefinders simultaneously measure the thickness of the web / lower flange from both sides of the I-beam 12, and the symmetrical cameras simultaneously acquire weld images from both sides.

[0041] This device uses a symmetrical arrangement to allow the rangefinder to acquire data from both sides of the same measurement section. By comparing the data, the random errors of unilateral measurement are eliminated, further improving the reliability of wear detection. At the same time, the cameras on both sides can cover the weld area on both sides of the I-beam 12, avoiding blind spots in the field of view of unilateral shooting and ensuring that no weld defects are missed.

[0042] Specifically, refer to Figure 1 and Figure 2 The high-precision laser rangefinder A7 and the camera 9 are both mounted on the top of the fixed body 3 and the movable body 4 via the connecting rod module 10. The high-precision laser rangefinder B8 is mounted on the top of the inner wall of the fixed body 3 and the movable body 4 via the telescopic plate 11.

[0043] The high-precision laser rangefinder A7 and camera 9 are mounted on the top of the fixed fuselage 3 and the movable fuselage 4 via the linkage module 10. By adjusting the length and angle of the linkage module 10, the rangefinder A7 can be aligned with the wear mark area of ​​the web plate of the I-beam 12, and the camera 9 can be aligned with the critical area of ​​the weld. The high-precision laser rangefinder B8 is mounted on the top of the inner wall of the fuselage via the telescopic plate 11. The lateral position of the rangefinder B8 can be adjusted by extending and retracting the telescopic plate 11, so that it is aligned with the wear area of ​​the wheel tread on the lower flange.

[0044] This device, through the adjustable design of the connecting rod module 10 and the telescopic plate 11, enables the rangefinder and camera to accurately adapt to the wear position of the I-beams of different single-beam cranes. Because the running trajectory of the electric hoist is different, the location of the wear marks may vary, eliminating the need to replace the special detection device and greatly improving the adaptability of the device. At the same time, it can focus on the wear area for targeted measurement, avoiding data interference from non-wear areas and improving the effectiveness of the detection data.

[0045] Specifically, refer to Figure 2 The two driving roller mechanisms 5 and the two supporting roller mechanisms 6 are arranged symmetrically.

[0046] Two drive roller mechanisms 5 are symmetrically arranged on the inner sidewalls of the fixed body 3 and the movable body 4, respectively. Two support roller mechanisms 6 are symmetrically arranged at both ends of the base 1 below the corresponding drive roller mechanisms 5. During testing, the symmetrical drive roller mechanisms 5 apply uniform pressure from both sides of the top surface of the lower flange of the I-beam 12, and the symmetrical support roller mechanisms 6 provide uniform support from both sides of the bottom surface of the lower flange, together forming a stable clamping structure.

[0047] This device, through a symmetrically arranged roller mechanism, ensures uniform force distribution on the lower flange of the I-beam 12, preventing tilting or displacement of the base 1 caused by unilateral force. Especially when traveling at heights, it effectively prevents the device from tipping over and falling off, further enhancing the safety of high-altitude inspections. At the same time, the uniform clamping force ensures stable friction between the drive roller mechanism 5 and the top surface of the lower flange, preventing slippage and resulting travel interruptions, and ensuring the continuity of the inspection process.

[0048] Specifically, refer to Figure 2 The drive roller mechanism 5 includes two drive rollers 501, which are respectively installed at both ends of the fixed body 3 and the movable body 4.

[0049] Each drive roller mechanism 5 includes two drive rollers 501, which are respectively installed at both ends of the fixed fuselage 3 or the movable fuselage 4 along the length of the I-beam. When started, the drive rollers 501 at both ends of the same fuselage rotate synchronously and, through the friction with the top surface of the lower flange of the I-beam 12, jointly drive the base 1 to move along the length of the I-beam.

[0050] This device uses a dual-drive roller 501 design at both ends of the same body to distribute the driving force, avoid slippage caused by insufficient friction of a single drive roller, and ensure stable travel speed of the base 1. At the same time, the increased number of support points of the dual rollers can further improve the stability of the base 1 when traveling at high altitudes, reduce detection interruptions caused by failure of a single roller, and improve the reliability of the device.

[0051] Specifically, the supporting roller mechanism 6 is a roller-type encoder.

[0052] The roller support mechanism 6 adopts a roller-type encoder. When the base 1 moves along the length of the I-beam 12, the bottom surface of the lower flange of the I-beam 12 drives the roller of the roller-type encoder to rotate. The encoder calculates the real-time travel distance of the base 1 by the number of rotations of the roller, and then associates the wear data measured by the high-precision laser rangefinders A7 and B8 with the corresponding I-beam position.

[0053] This device can accurately record the wear location using a roller-type encoder, solving the problems of low efficiency and large error in traditional manual marking of wear locations. It achieves a one-to-one correspondence between "wear amount and location", which facilitates the accurate location of I-beam sections that need repair or replacement. At the same time, this location data can serve as a basis for supervision, effectively tracing the wear of I-beams, curbing unauthorized replacement of I-beams, and improving the supervision process.

[0054] In one embodiment, reference Figure 1 and Figure 2 The high-precision laser rangefinder A7, high-precision laser rangefinder B8, and camera 9 on the fixed body 3 and the mobile body 4 are arranged sequentially at intervals along the length of the I-beam 12.

[0055] The high-precision laser rangefinder A7, high-precision laser rangefinder B8, and camera 9 on the fixed fuselage 3 and the moving fuselage 4 are arranged sequentially at intervals along the length of the I-beam 12—that is, the direction of travel of the base 1. When the base 1 moves, the device first measures the web thickness through the rangefinder A, then measures the lower flange thickness through the rangefinder B, and finally collects the weld image through the camera. There is no spatial interference between the functional modules.

[0056] This device avoids obstruction caused by spatial overlap between the rangefinder and the camera due to the spacing along the walking direction. This prevents the rangefinder from blocking the camera's field of view or the camera from interfering with the laser beam path. It ensures that the wear measurement and image acquisition functions operate independently and smoothly, eliminating the need to frequently start and stop the device to switch detection items and improving overall detection efficiency.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A failure detection device for I-beams in a single-girder crane, comprising a base (1), characterized in that, The top of the base (1) is provided with a guide rail mechanism (2). The base (1) is provided with a fixed body (3) and a movable body (4) located at both ends of the guide rail mechanism (2). The fixed body (3) is installed at the end of the guide rail mechanism (2), and the movable body (4) is slidably connected to the guide rail mechanism (2). The inner sidewalls of the fixed body (3) and the movable body (4) are respectively provided with drive roller mechanisms (5). The two ends of the base (1) are respectively provided with supporting roller mechanisms (6) located below the drive roller mechanisms (5). The working part of the drive roller mechanism (5) can contact the top surface of the lower flange of the I-beam (12). The working part of the supporting roller mechanism (6) can contact the bottom surface of the lower flange. The driving roller mechanism (5) and the supporting roller mechanism (6) can form a clamping and positioning of the lower flange. The driving roller mechanism (5) can drive the base (1) to move along the length direction of the I-beam (12). The fixed fuselage (3) and the moving fuselage (4) are equipped with a high-precision laser rangefinder A (7) and a high-precision laser rangefinder B (8). The high-precision laser rangefinder A (7) can measure the thickness of the web plate corresponding to the side of the web plate of the I-beam (12). The high-precision laser rangefinder B (8) can measure the thickness of the lower flange corresponding to the top surface of the lower flange.

2. The single-girder crane I-beam failure detection device according to claim 1, characterized in that, The guide rail mechanism (2) includes two linear modules (201), which are symmetrically arranged at both ends of the base (1). The moving body (4) is mounted on the slider of the linear module (201).

3. The single-girder crane I-beam failure detection device according to claim 2, characterized in that, The extension direction of the linear module (201) is perpendicular to the walking direction of the base (1) along the I-beam (12).

4. The failure detection device for I-beams in single-girder cranes according to claim 1, characterized in that, Both the fixed body (3) and the mobile body (4) are equipped with cameras (9), which are used for image acquisition of the I-beam (12).

5. The single-girder crane I-beam failure detection device according to claim 4, characterized in that, The two high-precision laser rangefinders A (7), the two high-precision laser rangefinders B (8), and the two cameras (9) are all arranged symmetrically.

6. The failure detection device for I-beams in single-girder cranes according to claim 5, characterized in that, The high-precision laser rangefinder A (7), high-precision laser rangefinder B (8), and camera (9) on the fixed body (3) and the mobile body (4) are arranged sequentially at intervals along the length of the I-beam (12).

7. The failure detection device for I-beams in single-girder cranes according to claim 6, characterized in that, The high-precision laser rangefinder A (7) and the camera (9) are both installed on the top of the fixed body (3) and the mobile body (4) via the linkage module (10), and the high-precision laser rangefinder B (8) is installed on the top of the inner wall of the fixed body (3) and the mobile body (4) via the telescopic plate (11).

8. The failure detection device for I-beams in single-girder cranes according to claim 1, characterized in that, The two drive roller mechanisms (5) and the two support roller mechanisms (6) are arranged symmetrically.

9. A failure detection device for I-beams in single-girder cranes according to claim 8, characterized in that, The drive roller mechanism (5) includes two drive rollers (501), which are respectively installed at both ends of the fixed body (3) and the movable body (4).

10. A failure detection device for I-beams in single-girder cranes according to claim 9, characterized in that, The supporting roller mechanism (6) is a roller encoder.

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