Truss crane track offset detector

Abstract

The utility model relates to the technical field of track offset detection of truss cranes, in particular to a track offset detector of a truss crane. Comprising a steel wire rope, winding mechanisms are arranged at the two ends of the steel wire rope, each winding mechanism comprises an assembling box, a top plate is arranged on the upper side of each assembling box, and an electric telescopic rod is vertically and fixedly installed on the upper side wall of each top plate. In the process that the displacement mechanisms on the two winding mechanisms synchronously adjust the extending positions of the steel wire ropes of the winding rollers on the two sides, the spring drives the two clamping plates to be close to each other, and the assembling box is clamped and fixed to the track through the two clamping plates, so that the assembling box can be rapidly installed, and the assembling efficiency is improved. And the tightening section of the steel wire rope is accurately aligned with the theoretical center line of the truss crane track, so that the straightening section of the steel wire rope and the theoretical center line of the track are kept parallel in the whole process, an accurate three-dimensional geometric reference basis is provided for track deformation measurement, and the accuracy of track detection data is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of gantry crane track offset detection technology, and more specifically, to a gantry crane track offset detector. Background Technology

[0002] A truss crane is a type of lifting equipment that uses a truss structure. Detecting whether the truss crane's tracks are misaligned is a crucial step in ensuring the safe operation of the equipment.

[0003] In existing technologies, the wire-stretching method is used to inspect long-distance tracks: First, special supports are installed at both ends of the track, extending 10-20cm above the top surface. A constant-force tensioner or a 10kg standard counterweight is used to continuously tension the calibration wire, ensuring that the wire is strictly parallel and horizontal to the theoretical centerline of the track (double-calibrated by a theodolite and a bubble level). For horizontal offset testing, measuring points are set every 2m along the track. A 0.5mm vernier caliper is placed vertically at the center of the track's top surface, and the horizontal distance between the caliper's reference edge and the wire is measured point by point, with the deviation recorded. For vertical offset testing, a laser rangefinder is used to determine the vertical distance from the track's top surface to the wire. For locally concave areas, a feeler gauge is used for millimeter-level precision supplementary measurements. Throughout the process, the wire tension (150N±5N) and ambient temperature (20±5℃) must be strictly controlled. Three repeated measurements are performed, and the average value is taken. The maximum allowable deviation between adjacent measuring points should not exceed ±3mm.

[0004] In existing technologies, the following problems are encountered when using the wire rope method to detect long-distance track deviations: 1. Due to strength requirements, the threaded holes in the track structure are limited, making it impossible to reliably fix the detection bracket with bolts. Rapid fixing and installation of the bracket is difficult, and it is hard to achieve stable support on complex track structures; 2. Precise adjustment of the end position of the wire rope is difficult to achieve, making it difficult to ensure that the wire rope is strictly parallel and horizontally aligned with the theoretical center line of the track; 3. After the detection operation is completed, the efficiency of rapid winding and storage of the wire rope is low, which makes the wire rope prone to wear or plastic deformation during repeated use. Utility Model Content

[0005] The purpose of this invention is to provide a track offset detector for truss cranes to solve the problems mentioned in the background art.

[0006] The track structure's strength requirements limit the opening of threaded holes, making it impossible to reliably fix the testing bracket with bolts, and posing difficulties for rapid fixing and installation of the bracket.

[0007] To address the above problems, the present invention aims to provide a gantry crane track offset detector, comprising a wire rope, with a winding mechanism at both ends of the wire rope. The winding mechanism includes an assembly box, a top plate on the upper side of the assembly box, an electric telescopic rod vertically fixed to the upper side wall of the top plate, a roller frame fixed to the piston rod end of the electric telescopic rod, a winding roller horizontally rotatable inside the roller frame, and the end of the wire rope wound and fixed to the winding roller. The assembly box contains a displacement mechanism for driving the top plate to move horizontally. Two clamping plates are symmetrically arranged on both sides of the assembly box, and two traction mechanisms are symmetrically arranged between the two clamping plates. When the displacement mechanism drives the top plate to move towards the center of the assembly box, the traction mechanisms drive the two clamping plates to move closer together.

[0008] As a further improvement to this technical solution, the displacement mechanism includes a lead screw that is horizontally rotatably disposed inside the assembly box. Guide rods that are horizontally fixed inside the assembly box are provided on both sides of the lead screw. A slide is threadedly connected to the lead screw, and the slide is slidably sleeved on the two guide rods.

[0009] As a further improvement to this technical solution, the displacement mechanism also includes two connecting frames symmetrically fixed on the slide table, the upper ends of which extend to the outside of the assembly box and are fixed to the lower side wall of the top plate.

[0010] As a further improvement to this technical solution, the traction mechanism includes a square frame horizontally fixed to the top of one side of the clamping plate. A positioning block is slidably arranged inside the square frame. The positioning block is fixed to the side wall of the assembly box. A spring is arranged between the side of the positioning block away from the clamping plate and the inner wall of the square frame. The spring pushes the positioning block away from the middle position of the assembly box.

[0011] As a further improvement to this technical solution, the traction mechanism also includes a gear rotatably disposed in the middle of the side wall of the assembly box. Two racks are symmetrically meshed on the upper and lower sides of the gear, and the ends of the two racks are respectively fixed to the side walls of the two frames in the horizontal direction.

[0012] As a further improvement to this technical solution, the traction mechanism also includes a protrusion fixedly installed on the top of the frame. When the top plate is located on the upper side of the assembly box near the edge, the side of the protrusion away from the clamping plate contacts the connecting frame, and a certain gap is maintained between the clamping plate and the assembly box.

[0013] As a further improvement to this technical solution, a sliding rod is horizontally fixed to the inner wall of the frame, a positioning block is slidably disposed on the sliding rod, and a spring is slidably sleeved on the sliding rod.

[0014] As a further improvement to this technical solution, a dust cover is horizontally fixed on the upper side of the assembly box, and a gap is left between the lower side wall of the dust cover and the upper side wall of the assembly box, and the connecting frame is slidably disposed in the gap.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. In this truss crane track offset detector, during the synchronous adjustment of the wire rope extension position of the two winding rollers on the displacement mechanism of the two winding mechanisms, the spring drives the two clamping plates to move closer to each other. The two clamping plates clamp and fix the assembly box on the track. While realizing the rapid installation of the assembly box, it also ensures that the taut section of the wire rope is precisely aligned with the theoretical center line of the truss crane track. This ensures that the taut section of the wire rope remains parallel to the theoretical center line of the track throughout the entire process, providing a precise three-dimensional geometric reference for track deformation measurement and ensuring the accuracy of track detection data.

[0017] 2. After the inspection is completed, the track offset detector of this truss crane can rotate the winding roller to wind up the wire rope. This action not only protects and manages the wire rope, but also shortens the length of the wire rope so that the two winding mechanisms can be brought together easily, effectively reducing the space occupied by the device. While ensuring the safety of the equipment, it significantly improves the overall portability of the device and facilitates subsequent warehousing and transportation operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of the winding mechanism of this utility model;

[0020] Figure 3 This is a partial structural schematic diagram of the winding mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the clamping plate and traction mechanism of this utility model;

[0022] Figure 5 This is a partial structural diagram of the clamping plate and traction mechanism of this utility model.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Steel wire rope;

[0025] 2. Winding mechanism; 21. Assembly box; 22. Top plate; 23. Electric telescopic rod; 24. Roller frame; 25. Winding roller;

[0026] 26. Displacement mechanism; 261. Lead screw; 262. Guide rod; 263. Slide table; 264. Connecting frame;

[0027] 27. Dust cover; 28. Plywood;

[0028] 29. Traction mechanism; 291. Frame; 292. Positioning block; 293. Spring; 294. Rack; 295. Gear; 296. Protrusion. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] Please see Figure 1 As shown, the purpose of this embodiment is to provide a gantry crane track offset detector, including a wire rope 1. Both ends of the wire rope 1 are provided with a winding mechanism 2 for winding and unwinding the wire rope 1. The two winding mechanisms 2 are respectively fixed to both ends of the wire rope 1. By synchronously adjusting the winding mechanisms 2 at both ends, it is ensured that the wire rope 1 between the two ends is always in a straight and taut state, thereby meeting the technical requirements for detecting the track offset of the gantry crane using the wire method.

[0032] The structure of winding mechanism 2 is detailed below, referring to... Figure 2The winding mechanism 2 includes an assembly box 21. A top plate 22 is provided on the upper side of the assembly box 21. An electric telescopic rod 23 is vertically fixed to the upper side wall of the top plate 22. The electric telescopic rod 23 has a built-in battery, which powers the electric telescopic rod 23, eliminating the need for external wiring and improving portability. A roller frame 24 is fixedly installed at the end of the piston rod of the electric telescopic rod 23. A winding roller 25 is horizontally rotatable inside the roller frame 24. One end of the winding roller 25 passes through the side wall of the roller frame 24 and is coaxially fixed with a ratchet mechanism. A linkage ratchet tooth and elastic plate assembly are configured on the corresponding position of the roller frame 24. The ratchet tooth restricts the rotation direction of the winding roller 25 through meshing, ensuring the positioning of the wire rope 1 after winding. Simultaneously, the ratchet tooth can adjust the direction of restriction, allowing the winding roller 25 to rotate during both unwinding and winding. The ratchet mechanism and ratchet teeth are the current technologies used in normal rotation. Their working principle and structure will not be illustrated or described in words here. At the other end of the take-up roller 25, a crank handle is rotated through the side wall of the roller frame 24 and fixed coaxially. The end of the wire rope 1 is wound and fixed on the take-up roller 25. The operator holds the crank handle to rotate the take-up roller 25, which can wind and unwind the wire rope 1. At the same time, the piston rod of the electric telescopic rod 23 extends and retracts, driving the roller frame 24 to rise and fall as a whole. The suspension height of the end of the wire rope 1 can be precisely adjusted. When the two ends of the wire rope 1 are synchronously leveled to the same horizontal height, the taut section of the wire rope 1 can form a baseline that is strictly parallel to the ground. This stable horizontal state fully meets the technical specifications for testing the vertical offset of the gantry crane track using the string method, providing an accurate geometric reference for track deformation measurement.

[0033] Meanwhile, a displacement mechanism 26 is installed inside the assembly box 21 to drive the top plate 22 to move horizontally. When the displacement mechanism 26 drives the top plate 22 to move horizontally, the position of the wire rope 1 extending from the winding roller 25 is adjusted accordingly. By adjusting the position of the wire rope 1 extending from its respective winding roller 25 at both ends, it is aligned with the theoretical center line of the gantry crane track. This ensures that the taut section of the wire rope 1 is always parallel to the theoretical center line of the track. This structural design strictly follows the technical specifications for detecting the horizontal deviation of the track using the string method. By establishing a geometric benchmark that precisely corresponds to the theoretical center line, a high-precision spatial reference system is provided for track deformation measurement, effectively ensuring the accuracy of the detection data.

[0034] The structure of displacement mechanism 26 is detailed below, referring to... Figure 3The displacement mechanism 26 includes a lead screw 261 horizontally rotatably disposed inside the assembly box 21. One end of the lead screw 261 rotatably passes through the side wall of the assembly box 21 and is coaxially fixed with a knob. Guide rods 262 are horizontally fixed inside the assembly box 21 on both sides of the lead screw 261, with the axis of the guide rods 262 parallel to the axis of the lead screw 261. A slide 263 is threaded onto the lead screw 261, and the slide 263 is slidably sleeved on the two guide rods 262, allowing the slide 263 to move only along the axis of the guide rods 262. The displacement mechanism 26 also includes two... A symmetrical connecting bracket 264 is fixed on the slide table 263. The upper end of the connecting bracket 264 extends to the outside of the assembly box 21 and is fixed to the lower side wall of the top plate 22. At the same time, a dust cover 27 is horizontally fixed on the upper side of the assembly box 21. A gap is left between the lower side wall of the dust cover 27 and the upper side wall of the assembly box 21. The connecting bracket 264 is slidably disposed in the gap. The dust cover 27 effectively prevents external pollutants from entering the interior of the assembly box 21, avoids dust accumulation on the threaded working surface of the lead screw 261, and ensures the reliability of the threaded transmission between the lead screw 261 and the slide table 263.

[0035] When the operator holds the knob to turn the lead screw 261, the guide rod 262 restricts the slide 263 to rotate with the lead screw 261. Through the threaded connection between the lead screw 261 and the slide 263, the slide 263 moves along the axis of the lead screw 261. The moving slide 263 drives the top plate 22 to move synchronously through the connecting frame 264, so as to horizontally adjust the position of the wire rope 1 extending from the winding roller 25, so that the taut section of the wire rope 1 is kept parallel to the theoretical center line of the track.

[0036] Before adjusting the relative position of the taut section of the wire rope 1 and the gantry crane rail, the assembly box 21 needs to be fixed by the following steps: First, place the assembly box 21 on the top surface of the gantry crane rail, which is a square column structure. Two clamping plates 28 are symmetrically arranged on both sides of the assembly box 21. When the top plate 22 is in the initial state, it is located on the upper side of the assembly box 21 near the edge. A certain gap is maintained between the clamping plates 28 and the assembly box 21. After the operator places the assembly box 21 on the upper side wall of the gantry crane rail, the two clamping plates 28 are located on both sides of the gantry crane rail. Two traction mechanisms 29 are symmetrically arranged between the two clamping plates 28. When the displacement mechanism 26 moves the top plate 22 toward the middle position of the assembly box 21, the traction mechanism 29 moves the two clamping plates 28 closer to each other. As the top plate 22 continues to move, the gap between the clamping plates 28 and the sides of the rail is gradually eliminated. Finally, the assembly box 21 is clamped and fixed on the gantry crane rail by the two clamping plates 28.

[0037] The structure of the traction mechanism 29 is described in detail below, with reference to... Figure 4 and Figure 5The traction mechanism 29 includes a rectangular frame 291 horizontally fixed to the top of one side of the clamping plate 28. A positioning block 292 is slidably disposed inside the rectangular frame 291. The positioning block 292 is fixed to the side wall of the assembly box 21. A spring 293 is disposed between the side of the positioning block 292 away from the clamping plate 28 and the inner wall of the rectangular frame 291. The spring 293 pushes the positioning block 292 away from the center position of the assembly box 21. A sliding rod is horizontally fixed to the inner wall of the rectangular frame 291. The positioning block 292 is slidably disposed on the sliding rod, and the spring 293 is slidably sleeved on the sliding rod. The sliding rod, on the one hand, ensures the stability of the spring 293... In addition to improving telescopic stability, the traction mechanism 29 also includes a gear 295 rotatably disposed in the middle of the side wall of the assembly box 21. Two racks 294 are symmetrically meshed on the upper and lower sides of the gear 295. The ends of the two racks 294 are fixed horizontally to the side walls of the two frames 291 respectively. The traction mechanism 29 also includes a protrusion 296 fixedly disposed on the top of the frame 291. The protrusion 296 cooperates with the connecting frame 264 to restrict the movement of the frame 291.

[0038] When the top plate 22 is located on the upper side of the assembly box 21 near the edge, the spring 293 is in an elastic contraction and energy storage state. The side of the protrusion 296 away from the clamping plate 28 contacts the connecting frame 264, preventing the spring 293 from rebounding, so that the clamping plate 28 and the assembly box 21 maintain a certain gap. When the connecting frame 264 drives the top plate 22 to move towards the middle position of the assembly box 21, the spring 293 rebounds and pushes the corresponding square frame 291 close to the gear 295. The square frame 291 drives the corresponding rack 294 to move synchronously in a straight line, thereby driving the gear 295 to generate rotational motion. The rotating gear 295, through meshing, links the rack 294 on the other side to move in the opposite direction, driving the corresponding square frame 291 to perform symmetrical motion. This bidirectional reciprocating transmission mechanism finally realizes the synchronous closing motion of the clamping plates 28 on both sides, forming a clamping and fixing of the side wall of the track.

[0039] When using this device, the operator first positions the assembly box 21 on the side wall of the track, ensuring that the two clamping plates 28 are positioned on both sides of the track. Then, the displacement mechanism 26 is activated to drive the top plate 22 towards the center of the assembly box 21, causing the clamping plates 28 to close towards each other, thus achieving a stable clamping of the assembly box 21 on the side wall of the track. After fixing the assembly box 21, the displacement mechanism 26 synchronously adjusts the extension position of the wire rope 1 on both sides of the winding rollers 25, ensuring that the taut section of the wire rope 1 is precisely aligned with the theoretical centerline of the gantry crane track, thereby ensuring the stability of the wire rope 1. The taut section remains parallel to the theoretical centerline of the track throughout its length. Based on this, the operator manipulates the electric telescopic rod 23 to extend and retract the piston rod, driving the roller frame 24 to rise and fall vertically as a whole, precisely calibrating the suspension height of the end of the wire rope 1. After this dual adjustment, the taut section of the wire rope 1 remains parallel to the theoretical centerline of the track and forms a strictly horizontal spatial reference line on the ground, providing an accurate three-dimensional geometric reference for track deformation measurement. This reference line simultaneously meets the requirements of axis alignment and levelness, effectively ensuring the accuracy of track detection data.

[0040] After the inspection is completed, the operator first drives the displacement mechanism 26 to reset the top plate 22 to the edge of the assembly box 21, releases the clamping and fixing of the two side clamps 28 to the assembly box 21, and then the operator rotates the winding roller 25 to wind up the wire rope 1. This action not only achieves the protection and management of the wire rope 1, but also allows the two winding mechanisms 2 to be easily brought together by shortening the length of the wire rope 1, effectively reducing the space occupied by the device. While ensuring the safety of the equipment, it significantly improves the overall portability of the device and facilitates subsequent warehousing and transportation operations.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A track offset detector for a truss crane, comprising a wire rope (1), characterized in that: Both ends of the wire rope (1) are provided with a winding mechanism (2). The winding mechanism (2) includes an assembly box (21). A top plate (22) is provided on the upper side of the assembly box (21). An electric telescopic rod (23) is vertically fixed on the upper side wall of the top plate (22). A roller frame (24) is fixedly provided at the end of the piston rod of the electric telescopic rod (23). A winding roller (25) is horizontally rotatably provided inside the roller frame (24). The end of the wire rope (1) is wound and fixed on the winding roller (25). A displacement mechanism (26) for driving the top plate (22) to move horizontally is provided inside the assembly box (21). Two clamping plates (28) are symmetrically provided on both sides of the assembly box (21). Two traction mechanisms (29) are symmetrically provided between the two clamping plates (28). When the displacement mechanism (26) drives the top plate (22) to move towards the middle position of the assembly box (21), the traction mechanism (29) drives the two clamping plates (28) to move closer to each other.

2. The gantry crane track offset detector according to claim 1, characterized in that: The displacement mechanism (26) includes a lead screw (261) that is horizontally rotatably disposed inside the assembly box (21). Guide rods (262) that are horizontally fixed inside the assembly box (21) are provided on both sides of the lead screw (261). A slide (263) is threadedly connected to the lead screw (261). The slide (263) is slidably sleeved on the two guide rods (262).

3. The gantry crane track offset detector according to claim 2, characterized in that: The displacement mechanism (26) also includes two connecting frames (264) symmetrically fixed on the slide (263), the upper ends of which extend to the outside of the assembly box (21) and are fixed to the lower side wall of the top plate (22).

4. The gantry crane track offset detector according to claim 1, characterized in that: The traction mechanism (29) includes a square frame (291) horizontally fixed to the top of one side of the clamping plate (28). A positioning block (292) is slidably arranged inside the square frame (291). The positioning block (292) is fixed to the side wall of the assembly box (21). A spring (293) is arranged between the side of the positioning block (292) away from the clamping plate (28) and the inner wall of the square frame (291). The spring (293) pushes the positioning block (292) away from the middle position of the assembly box (21).

5. The gantry crane track offset detector according to claim 4, characterized in that: The traction mechanism (29) further includes a gear (295) that is rotatably disposed in the middle of the side wall of the assembly box (21). The gear (295) has two racks (294) that are symmetrically meshed on its upper and lower sides. The ends of the two racks (294) are fixed to the side walls of the two squares (291) in the horizontal direction.

6. The gantry crane track offset detector according to claim 4, characterized in that: The traction mechanism (29) also includes a protrusion (296) fixedly installed on the top of the frame (291). When the top plate (22) is located on the upper side of the assembly box (21) near the edge, the side of the protrusion (296) away from the clamping plate (28) contacts the connecting frame (264), and a certain gap is maintained between the clamping plate (28) and the assembly box (21).

7. The gantry crane track offset detector according to claim 4, characterized in that: The inner wall of the frame (291) is horizontally fixed with a sliding rod, the positioning block (292) is slidably mounted on the sliding rod, and the spring (293) is slidably sleeved on the sliding rod.

8. The gantry crane track offset detector according to claim 3, characterized in that: A dust cover (27) is horizontally fixed on the upper side of the assembly box (21). A gap is left between the lower side wall of the dust cover (27) and the upper side wall of the assembly box (21). The connecting frame (264) is slidably disposed in the gap.

Images