Portal crane girder bending detection device

Abstract

This invention discloses a gantry crane main beam bending detection device, relating to the field of detection equipment. It includes: a detection trolley, a marking plate, a fixing component, a distance measuring component, a distance extending component, and a controller. The controller controls the fixing component, the distance measuring component, and the distance extending component. The marking plate is installed on one side of the detection trolley and has marking points. The fixing component fixes the marking plate to one end of the main beam. The distance measuring component is installed on the other side of the detection trolley. This invention significantly reduces installation difficulty and risk, and improves the convenience of detection by installing the detection device on the main beam's track and using the detection trolley at the mid-span of the main beam in conjunction with the marking plate at one end of the main beam to detect the bending distance of the main beam track, thereby obtaining the bending distance of the main beam.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, specifically a device for detecting the bending of the main beam of a gantry crane. Background Technology

[0002] Gantry cranes are one of the core pieces of equipment for material handling and loading / unloading operations. As the most important load-bearing component of a gantry crane, the main beam may gradually deflect under long-term alternating loads. Therefore, it is necessary to accurately and efficiently detect the curvature of the main beam.

[0003] Currently, the measurement of the bending of crane main beams mainly relies on methods such as the suspension line method, the level method, and the theodolite method. All of these methods involve manual measurement, which is greatly affected by human factors. Furthermore, the measuring instruments themselves have low accuracy, and the detection methods are complex. In the existing technology, a laser measurement method is used. This method involves installing a laser transmitter at the mid-span of the main beam and a receiver at both ends of the main beam. The bending distance of the main beam is obtained by identifying the distance the laser moves on the receiver under load and no load. Although this method has high detection accuracy and is easy to operate, the installation and alignment of the laser transmitter and receiver are cumbersome, the degree of automation is low, and factors such as the bending of the main beam and dust and impurities can cause the detection benchmark to drift, resulting in changes in the laser emission height and thus causing deviations in the bending calculation results.

[0004] Therefore, the present invention provides a device for detecting the bending of the main beam of a gantry crane. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a gantry crane main beam bending detection device to solve the problems existing in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A gantry crane main beam bending detection device includes: a detection trolley, a marking plate, a fixing component, a distance measuring component, a distance extending component, and a controller; The marking plate is installed on one side of the inspection trolley, and the marking plate is provided with marking points; The fixing component is used to fix the marking plate to one end of the main beam; The ranging component is installed on the other side of the inspection vehicle. It includes a laser rangefinder, an encoder, a vision camera, and a motor. The motor is used to drive the laser rangefinder to rotate. The encoder is used to detect the angle of rotation of the laser rangefinder. The vision camera is installed on the side of the inspection vehicle near the marking plate. The distance-increasing component includes a T-shaped plate, a rotating shaft, and a cam. The distance measuring component is installed in the horizontal part of the T-shaped plate. One end of the rotating shaft is rotatably connected to the end of the vertical part of the T-shaped plate. The other end of the rotating shaft extends out to the detection trolley. The cam is fixedly connected to the other end of the rotating shaft.

[0007] Preferably, the bottom of the detection trolley is equipped with multiple sets of drive wheels on one side of the distance-extending component, and each drive wheel includes two rollers connected by a coupling.

[0008] Preferably, the fixing assembly includes a second motor, a first gear, and two clamping plates. The second motor is mounted on the inspection trolley, and the first gear is rotatably mounted on the inspection trolley. The output shaft of the second motor is fixed to the shaft of the first gear. A lead screw and a round rod are rotatably mounted on the marking plate. The threads at both ends of the lead screw, excluding the center, have opposite directions. The two clamping plates are threadedly connected to the two ends of the lead screw with opposite directions, and the clamping plates are slidably connected to the marking plate. One end of the round rod is fixedly connected to one end of the lead screw, and a second gear is mounted on the outside of the round rod, which meshes with the first gear.

[0009] Preferably, the clamping plate is composed of a square plate and a semi-circular plate, with the semi-circular plate located at one end of the square plate near the bottom of the detection trolley.

[0010] Preferably, a frustum magnet is provided on the side of the marking plate near the inspection trolley, and a frustum hole corresponding to the position of the frustum magnet is opened on the side of the inspection trolley near the marking plate, and an electromagnet is installed in the frustum hole.

[0011] Preferably, the T-shaped plate has a slot, and the ranging component also includes a mounting sleeve located in the slot. The mounting sleeve consists of a housing for mounting the laser rangefinder and two rotating rods, which are respectively fixed to the output shafts of the encoder and the motor.

[0012] Preferably, the detection trolley has a T-shaped groove, the T-shaped plate is slidably installed in the T-shaped groove, a ring is fixedly connected to the outside of the rotating shaft, and a square rod and a square rod are fixed on the ring. The square rod is inclined and the square rod is horizontal. A cylinder and a cylinder are installed at the bottom of the detection trolley. One end of the cylinder is fixedly connected to the output shaft of the cylinder, and the other end of the cylinder is located above the square rod. A block is set between the square rod and the square rod, and the included angle between the block and the adjacent side of the square rod is 90°.

[0013] Preferably, the detection trolley is provided with a protrusion, the protrusion having a square groove inside, and a connecting block is provided on the outside of the rotating shaft. The connecting block consists of a second ring, a second square block, and a rotating wheel. The second ring and the second square block are fixedly connected. The rotating wheel is rotatably installed on the outside of the second ring, and the rotating shaft is rotatably installed inside the second ring. One end of the second square block is slidably connected in the square groove, and a spring is installed in the square groove on the protrusion. The two ends of the spring are fixedly connected to the protrusion and the second square block, respectively.

[0014] Preferably, the detection trolley is equipped with an angle sensor, two cylinders, and two cylinders. The cylinders are fixedly connected to the output ends of the cylinders and are located at the bottom of the detection trolley.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses a distance-extending component as the core, combined with a separate automatic clamping, active leveling, and integrated rotating distance measuring structure, to achieve stable reference, automatic impurity removal, unattended operation throughout the process, and synchronous compensation for multiple errors. It takes into account the convenience of installation, operational safety, and measurement accuracy, and solves the pain points of existing equipment such as easy reference drift and poor adaptability to working conditions.

[0016] 2. This invention integrates the ranging component into the T-shaped plate by setting a T-shaped sliding plate with a T-shaped groove sliding structure, so that the ranging unit can be raised and lowered synchronously with the cam; at the same time, the cam mechanically adheres to the outer bottom plate of the track to form a fixed reference, and with the double protection of spring floating clamping and trolley active leveling, the deflection calculation error caused by the reference variable is reduced.

[0017] 3. This invention uses a rotating cam to scrape away dust and debris from the track base plate, preventing debris from raising the cam and changing the detection value. Furthermore, the hard limit of the square rod and block ensures that the cam rotation angle is unique, eliminating the need for manual calibration of the cam position. The controller can establish the benchmark with one click. Attached Figure Description

[0018] Figure 1 This is a front perspective view of the detection device of the present invention; Figure 2 This is a three-dimensional view of the marking plate of the present invention; Figure 3 This is a three-dimensional view of the structure of the detection vehicle of the present invention; Figure 4 This is a front cross-sectional view of the detection vehicle of the present invention; Figure 5 For the present invention Figure 6 A magnified view of part A in the image; Figure 6 For the present invention Figure 6 A magnified view of part B in the image; Figure 7 This is a three-dimensional structural view of the ranging component and the distance-increasing component of the present invention; Figure 8 This is a rear-view perspective view of the detection device of the present invention; Figure 9 This is a schematic diagram of the detection method of the present invention.

[0019] Figure label: 1. Inspection trolley; 11. Drive wheel; 12. Frustum-shaped hole; 13. Electromagnet; 14. T-slot; 15. Tilt sensor; 16. Cylinder II; 17. Cylinder II; 2. Marking plate; 21. Marking point; 22. Frustum-shaped magnet; 3. Fixing assembly; 31. Motor II; 32. Gear I; 33. Clamping plate; 34. Lead screw; 35. Round rod; 36. Gear II; 4. Distance measuring assembly; 41. Laser rangefinder; 42. Encoder; 43. Vision camera; 44. Motor 1; 45. Mounting sleeve; 5. Extender assembly; 51. T-shaped plate; 52. Rotating shaft; 53. Cam; 54. Slot 1; 55. Square rod 1; 56. Square rod 2; 57. Cylinder 1; 58. Cylindrical rod 1; 59. Block 1; 510. Protrusion; 511. Connecting block; 512. Square groove; 513. Block 2; 514. Rotating wheel; 515. Spring. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in this technical field.

[0023] Please refer to Figures 1-9 This embodiment proposes a gantry crane main beam bending detection device, which is installed on the track on the main beam of the gantry crane and includes: detection trolley 1, marking plate 2, fixing component 3, distance measuring component 4, distance extending component 5, and controller; The controller is used to control the fixed component 3, the ranging component 4, and the distance extending component 5; Marking plate 2 is installed on one side of the inspection trolley 1, and marking points 21 are provided on marking plate 2; Fixing component 3 is used to fix the marking plate 2 to one end of the main beam; The ranging component 4 is installed on the other side of the detection carriage 1. It includes a laser rangefinder 41, an encoder 42, a vision camera 43, and a motor 44. The motor 44 is used to drive the laser rangefinder 41 to rotate, the encoder 42 is used to detect the angle of rotation of the laser rangefinder 41, and the vision camera 43 is installed on the side of the detection carriage 1 near the marking plate 2. The distance-extending assembly 5 includes a T-shaped plate 51, a rotating shaft 52, and a cam 53. The distance measuring assembly 4 is installed in the horizontal part of the T-shaped plate 51. One end of the rotating shaft 52 is rotatably connected to the end of the vertical part of the T-shaped plate 51, and the other end of the rotating shaft 52 extends out of the detection trolley 1. The cam 53 is fixedly connected to the other end of the rotating shaft 52.

[0024] During load testing, the gantry crane's moving trolley moves to the mid-span of the main beam and loads the rated weight. The controller controls the fixing assembly 3 to fix the marking plate 2 to one end of the main beam, and then controls the testing trolley 1 to move along the track to one side of the moving trolley, so that the rotating shaft 52 and cam 53 are inserted into the track side at the bottom of the trolley, and the cam 53 is located at the center of the main beam. The rotating shaft 52 in the distance-extending assembly 5 rotates 90°, so that the midpoint of the protrusion of the cam 53 rotates to contact the outer bottom plate of the track. At this time, the laser rangefinder 41 in the distance measuring assembly 4 on the T-shaped plate 51 is activated, illuminating the marking plate 2 with laser light. The controller starts motor 44, driving the laser rangefinder 41 to rotate. At the same time, the vision camera 43 performs visual recognition on the marking plate 2. When the point illuminated by the laser rangefinder 41 on the marking plate 2 coincides with the marking point 21 on the marking plate 2, the laser rangefinder 41 records the current distance between itself and the marking point 21. Similarly, during no-load testing, the trolley is moved to the outrigger position of the gantry crane to unload the load on the main beam, and the distance between the laser rangefinder 41 and the marking point 21 is recorded by the above method. At the same time, the encoder 42 records the rotation angle of the laser rangefinder 41.

[0025] like Figure 9 As shown, S2 is the main beam under load, and the distance increased by the distance-extending component 5 is L, which is the distance from the T-shaped plate 51 to the midpoint of the protrusion of the cam 53. The distance recorded by the laser rangefinder 41 under load is D2, and the angle of rotation of the laser rangefinder 41 detected by the encoder 42 is a2. S1 is the main beam under load, and the distance increased by the distance-extending component 5 is L. The distance recorded by the laser rangefinder 41 under no-load is D1, and the angle of rotation of the laser rangefinder 41 detected by the encoder 42 is a1. The bending distance of the main beam under load and no-load is l2, because l2+b=l1+b=L. Therefore, the length of l1 can be calculated from D1, D2, a1, and a2, and thus the length of l2 can be obtained, and the bending distance of the main beam can be obtained.

[0026] This embodiment installs the detection device on the track of the main beam, and uses the detection trolley 1 at the mid-span of the main beam in conjunction with the marking plate 2 at one end of the main beam to detect the bending distance of the main beam track, thereby obtaining the bending distance of the main beam. This greatly reduces the installation difficulty and risk, and improves the convenience of detection. Furthermore, this embodiment uses the distance extender 5 to convert the position of the mid-span of the main beam into the position of the laser rangefinder 41, and uses the laser rangefinder 41 to measure the distance from the laser rangefinder 41 to the marking point 21 under load and no load, and calculates the bending distance of the main beam under load and no load. The detection method is simple and effective, and the detection difficulty is low.

[0027] like Figure 3 , Figure 8 As shown, the bottom of the detection trolley 1 is equipped with multiple sets of drive wheels 11 on one side of the distance-extending component 5. Each drive wheel 11 includes two rollers connected by a coupling. The drive wheels 11 are driven by a drive motor mounted on the detection trolley 1, and the two rollers are located on both sides of the track for limiting.

[0028] like Figure 1 , Figure 2 , Figure 3 As shown, the fixing assembly 3 includes a second motor 31, a first gear 32, and two clamping plates 33. The second motor 31 is mounted on the detection carriage 1, and the first gear 32 is rotatably mounted on the detection carriage 1. The output shaft of the second motor 31 is fixed to the shaft of the first gear 32. A lead screw 34 and a round rod 35 are rotatably mounted on the marking plate 2. The threads at both ends of the lead screw 34 outside the center have opposite directions. The two clamping plates 33 are threadedly connected to the two ends of the lead screw 34 with opposite directions of thread, and the clamping plates 33 are slidably connected to the marking plate 2. One end of the round rod 35 is fixedly connected to one end of the lead screw 34, and a second gear 36 is mounted on the outside of the round rod 35, which meshes with the first gear 32. Plate 33 is located on both sides of the track. When fixed, the controller starts motor 2 31, drives gear 1 32 to rotate, and drives gear 2 36, which meshes with gear 1 32, to rotate. In turn, the round rod 35 drives the lead screw 34 to rotate. Since the threads at both ends of the lead screw 34 outside the center turn in opposite directions, and the two clamping plates 33 are slidably connected to the marking plate 2, the rotation of the lead screw 34 drives the two clamping plates 33 to move closer to each other, clamping the track and fixing it. After fixing is completed, the detection trolley 1 moves through the drive wheel 11 and separates from the marking plate 2. It should be noted that when the detection trolley 1 returns to the marking plate 2, gear 2 36 meshes with gear 1 32 again.

[0029] like Figure 1 As shown, the clamping plate 33 is composed of a square plate and a semi-circular plate. The semi-circular plate is located at one end of the square plate near the bottom of the detection trolley 1. The clamping plate 33 maintains contact with the outer bottom plate of the track through the plane of the semi-circular plate, thereby ensuring the stability of the clamping plate 33.

[0030] like Figure 2, Figure 3 As shown, a frustum magnet 22 is provided on the side of the marking plate 2 near the detection carriage 1. A frustum hole 12 corresponding to the position of the frustum magnet 22 is opened on the side of the detection carriage 1 near the marking plate 2, and an electromagnet 13 is installed in the frustum hole 12. When the detection carriage 1 separates from the marking plate 2, the controller de-energizes the electromagnet 13, releasing the attraction of the frustum magnet 22. When the detection carriage 1 and the marking plate 2 are reset, the frustum magnet 22 on the marking plate 2 is inserted into the frustum hole 12, and the electromagnet 13 is energized to attract the frustum magnet 22. When the frustum magnet 22 is inserted into the frustum hole 12, the shape of the two matches to achieve automatic reset of the marking plate 2.

[0031] like Figure 4 , Figure 5 As shown, a slot 54 is provided on the T-shaped plate 51. The ranging assembly 4 also includes a mounting sleeve 45, which is located in the slot 54. The mounting sleeve 45 consists of a housing for mounting the laser rangefinder 41 and two rotating rods. The two rotating rods are fixed to the output shafts of the encoder 42 and the motor 44, respectively. When the motor 44 is started, it can drive the laser rangefinder 41 inside the mounting sleeve 45 to rotate through one of the rotating rods. The rotation of the mounting sleeve 45 drives the other rotating rod to rotate, thereby measuring the angle of rotation of the laser rangefinder 41 through the encoder 42 connected to the other rotating rod.

[0032] like Figure 4 , Figure 6 , Figure 7 As shown, the inspection trolley 1 has a T-shaped groove 14, and a T-shaped plate 51 is slidably installed in the T-shaped groove 14. A ring 1 is fixedly connected to the outside of the rotating shaft 52. A square rod 1 55 and a square rod 2 56 are fixed on the ring 1. The square rod 1 55 is inclined, and the square rod 2 56 is horizontal. A cylinder 1 57 and a cylinder 1 58 are installed at the bottom of the inspection trolley 1. One end of the cylinder 1 58 is fixedly connected to the output shaft of the cylinder 1 57, and the other end of the cylinder 1 58 is located above the square rod 1 55. A block 1 59 is set between the square rod 1 55 and the square rod 2 56 in the inspection trolley 1. The block 1 59 and the square rod 2 56 are connected... The included angle between adjacent sides is 90°. During detection, the controller starts cylinder 57, causing its cylinder 58 to move downward and push the square rod 55, thereby causing the rotating shaft 52 connected to the square rod 55 via the ring to rotate, and causing the cam 53 at one end of the rotating shaft 52 to rotate. When the cam 53 rotates, the protruding part of the cam 53 contacts the outer base plate of the track and moves upward due to the restriction of the outer base plate of the track, thereby driving the rotating shaft 52 to move upward and driving the T-shaped plate 51 to slide upward along the T-shaped groove 14, so that the distance between the laser rangefinder 41 on the T-shaped plate 51 and the outer base plate of the track is always L.

[0033] It should be noted that when cylinder 58 pushes square rod 55 to rotate 90°, square rod 56 also rotates 90° and comes into contact with block 59. Block 59 limits square rod 56, thus ensuring that square rod 55 and shaft 52 only rotate 90°.

[0034] It should be noted that when the cam 53 rotates, it contacts the outer base plate of the track through its edge to remove dust from the outer base plate of the track, ensuring that the distance L increased by the distance-extending component 5 remains unchanged.

[0035] like Figure 6 , Figure 7 As shown, the inspection trolley 1 is equipped with a protrusion 510, and a square groove 512 is formed inside the protrusion 510. A connecting block 511 is provided on the outside of the rotating shaft 52. The connecting block 511 consists of a ring 2, a square block 2 513, and a rotating wheel 514. The ring 2 and the square block 2 513 are fixedly connected. The rotating wheel 514 is rotatably mounted on the outside of the ring 2. The rotating shaft 52 is rotatably mounted inside the ring 2. One end of the square block 2 513 is slidably connected in the square groove 512. A spring 515 is installed in the square groove 512 of the protrusion 510. The two ends of the spring 515 are respectively connected to the protrusion 510. 0. Block 2 513 is fixedly connected; when not in the detection state, spring 515 applies downward pressure to block 2 513, causing the rotating wheel 514 below the connecting block 511 to contact the outer base plate of the track. When the trolley moves, the rotating wheel 514 moves with it and rolls on the outer base plate of the track; the rotating shaft 52 and cam 53 maintain a certain distance from the outer base plate of the track through the rotating wheel 514; during detection, the spring 515 applies downward pressure to the rotating shaft 52, so that the center of the protruding part of the cam 53 is always in contact with the outer base plate of the track, ensuring that the distance L increased by the distance-extending component 5 remains unchanged.

[0036] like Figure 3 , Figure 8 As shown, the detection trolley 1 is equipped with an inclination sensor 15, two cylinders 16, and two cylinders 17. The cylinders 17 are fixedly connected to the output ends of the cylinders 16 and are located at the bottom of the detection trolley 1. The two cylinders 16 and the two cylinders 17 are respectively installed on both sides of the detection trolley 1. When under load or unloaded, the track bends upward or downward. The inclination sensor 15 detects the inclination angle of the detection trolley 1 and transmits the signal to the controller. The controller starts the cylinders 16, causing the cylinders 17 to move downward, increasing the distance on one side of the detection trolley 1, keeping the detection trolley 1 horizontal, thereby further ensuring that the distance L increased by the distance-extending component 5 remains unchanged.

[0037] It should be noted that, in order to resist the bending of the main beam, existing technology usually designs the main beam as an upward arch during production, so the track will bend upward when unloaded.

[0038] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A device for detecting the bending degree of the main beam of a gantry crane, characterized in that, include: The detection vehicle (1), marking plate (2), fixing component (3), ranging component (4), distance extending component (5), and controller; The marking plate (2) is installed on one side of the detection trolley (1), and the marking plate (2) is provided with marking points (21). The fixing component (3) is used to fix the marking plate (2) to one end of the main beam; The ranging component (4) is installed on the other side of the detection trolley (1), and includes a laser rangefinder (41), an encoder (42), a vision camera (43) and a motor (44). The motor (44) is used to drive the laser rangefinder (41) to rotate, the encoder (42) is used to detect the angle of rotation of the laser rangefinder (41), and the vision camera (43) is installed on the side of the detection trolley (1) near the marking plate (2). The distance-extending component (5) includes a T-shaped plate (51), a rotating shaft (52), and a cam (53). The distance measuring component (4) is installed in the horizontal part of the T-shaped plate (51). One end of the rotating shaft (52) is rotatably connected to the end of the vertical part of the T-shaped plate (51). The other end of the rotating shaft (52) extends out of the detection trolley (1). The cam (53) is fixedly connected to the other end of the rotating shaft (52).

2. The gantry crane main beam bending detection device as described in claim 1, characterized in that: The bottom of the detection trolley (1) is equipped with multiple sets of drive wheels (11) on one side of the distance-extending component (5). Each drive wheel (11) includes two rollers, which are connected by a coupling.

3. The gantry crane main beam bending detection device as described in claim 1, characterized in that: The fixing component (3) includes a second motor (31), a first gear (32), and two clamping plates (33). The second motor (31) is mounted on the detection trolley (1), and the first gear (32) is rotatably mounted on the detection trolley (1). The output shaft of the second motor (31) is fixed to the shaft of the first gear (32). A lead screw (34) and a round rod (35) are rotatably mounted on the marking plate (2). The threads at both ends of the lead screw (34) outside the center are opposite in direction. The two clamping plates (33) are respectively threaded to the two ends of the lead screw (34) with opposite threads. The clamping plates (33) are slidably connected to the marking plate (2). One end of the round rod (35) is fixedly connected to one end of the lead screw (34). A second gear (36) is mounted on the outside of the round rod (35). The second gear (36) meshes with the first gear (32).

4. The gantry crane main beam bending detection device as described in claim 3, characterized in that: The clamp (33) is composed of a square plate and a semi-circular plate, with the semi-circular plate located at one end of the square plate near the bottom of the detection trolley (1).

5. The gantry crane main beam bending detection device as described in claim 1, characterized in that: The marking plate (2) is provided with a frustum magnet (22) on the side near the detection trolley (1). The detection trolley (1) is provided with a frustum hole (12) on the side near the marking plate (2) that corresponds to the position of the frustum magnet (22). An electromagnet (13) is installed in the frustum hole (12).

6. The gantry crane main beam bending detection device as described in claim 1, characterized in that: The T-shaped plate (51) has a slot (54) and the ranging component (4) also includes a mounting sleeve (45). The mounting sleeve (45) is located in the slot (54). The mounting sleeve (45) consists of a housing for mounting the laser rangefinder (41) and two rotating rods. The two rotating rods are respectively fixed to the output shafts of the encoder (42) and the motor (44).

7. The gantry crane main beam bending detection device as described in claim 1, characterized in that: The detection trolley (1) has a T-shaped groove (14) inside. The T-shaped plate (51) is slidably installed in the T-shaped groove (14). A ring is fixedly connected to the outside of the rotating shaft (52). A square rod (55) and a square rod (56) are fixed on the ring. The square rod (55) is inclined and the square rod (56) is horizontal. A cylinder (57) and a cylinder (58) are installed at the bottom of the detection trolley (1). One end of the cylinder (58) is fixedly connected to the output shaft of the cylinder (57). The other end of the cylinder (58) is located above the square rod (55). A block (59) is set between the square rod (55) and the square rod (56) in the detection trolley (1). The included angle between the block (59) and the adjacent side of the square rod (56) is 90°.

8. The gantry crane main beam bending detection device as described in claim 1, characterized in that: The detection trolley (1) is provided with a protrusion (510), and a square groove (512) is provided in the protrusion (510). A connecting block (511) is provided on the outside of the rotating shaft (52). The connecting block (511) consists of a ring II, a square II (513) and a rotating wheel (514). The ring II and the square II (513) are fixedly connected. The rotating wheel (514) is rotatably installed on the outside of the ring II. The rotating shaft (52) is rotatably installed in the ring II. One end of the square II (513) is slidably connected in the square groove (512). A spring (515) is installed in the square groove (512) of the protrusion (510). The two ends of the spring (515) are fixedly connected to the protrusion (510) and the square II (513) respectively.

9. The gantry crane main beam bending detection device as described in claim 1, characterized in that: The detection trolley (1) is equipped with an angle sensor (15), two cylinders (16) and two cylinders (17). The cylinders (17) are fixedly connected to the output ends of the cylinders (16) and are located at the bottom of the detection trolley (1).

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