Stay cable lifting device and method

Abstract

The invention relates to the field of lifting devices, and discloses a stay cable lifting device which comprises a frame, a lifting mechanism and a telescopic auxiliary supporting assembly, a bearing part is arranged on the top face of the tail end of the frame, and the auxiliary supporting assembly is connected to the end face of a roller. A hydraulic driving mechanism is connected between the bearing component and the auxiliary supporting assembly, and the bearing component moves downwards along with the increase of the load of the hoisting mechanism and drives the auxiliary supporting assembly to be converted into an extending state from a contraction state through the hydraulic driving mechanism. The auxiliary supporting assemblies in the stretching state are matched with the rolling wheels to jointly support the lifting mechanism. The auxiliary supporting assembly is linked through displacement feedback of the bearing component, so that the device has the capacity of automatically retracting under light load and automatically expanding under heavy load, and the intelligent responsiveness and adaptability of the system are improved; and through dynamic auxiliary supporting, the overall supporting stability is improved when the large heavy-load component is hoisted.

Description

Technical Field

[0001] This invention relates to the field of lifting devices, and more particularly to a cable-stayed cable lifting device and method. Background Technology

[0002] Steel box girders are widely used in bridge engineering, steel structure workshops, and large equipment manufacturing due to their high structural strength and short construction period. During the hoisting and transportation of steel box girders, gantry cranes, as efficient and stable lifting devices, play a crucial role. Currently, existing gantry cranes typically use multiple rollers working in conjunction with rails to achieve horizontal movement of the lifting components. They generally include a gantry frame structure, a lifting device, and a traveling mechanism for horizontal movement. Specifically, several roller assemblies are installed below the lifting components. The rollers are mounted on the car body or carriage via bearings and roll along rails set on the crossbeams, thus achieving stable horizontal movement.

[0003] However, in practical applications, especially when hoisting large-span, heavy-load steel box girder components, existing gantry cranes have revealed certain limitations. Specifically, the lifting components of traditional gantry cranes are supported by a few rollers in contact with the rails. While this can meet the operational requirements under normal working conditions, when hoisting steel box girders, the large weight of the steel box girder and the small contact area between the rollers and the rails result in high unit contact pressure, making the rollers and rails prone to damage and affecting the safety and service life of the lifting equipment. Simply adding more rollers to share the load requires higher standards for roller consistency and rail straightness. Each additional roller significantly increases the difficulty of error control. Furthermore, in the unloaded state, it increases unnecessary running resistance, leading to high friction and high energy consumption when unloaded. Summary of the Invention

[0004] The purpose of this application is to provide a cable-stayed hoisting device and method to solve the problems of existing traditional gantry cranes when hoisting steel box girders. These problems arise because the immense weight of the steel box girder leads to high contact pressure on the rollers, making them prone to damage. Furthermore, simply adding more rollers to share the load requires high consistency of the rollers and straightness of the track. Each additional roller significantly increases the difficulty of error control and, under no-load conditions, increases unnecessary running resistance, resulting in high friction and energy consumption. The specific technical solution is as follows: A cable-stayed hoisting device includes a frame, a hoisting mechanism, and a retractable auxiliary support assembly. The hoisting mechanism is equipped with rollers and is located on the top of the frame. Both ends of the frame are provided with load-bearing components. The auxiliary support assembly is connected to the end faces of the rollers. A hydraulic drive mechanism is connected between the load-bearing components and the auxiliary support assembly. As the load of the hoisting mechanism increases, the load-bearing components move downward and drive the auxiliary support assembly from a retracted state to an extended state through the hydraulic drive mechanism. In the extended state, the auxiliary support assembly, together with the rollers, supports the hoisting mechanism.

[0005] As an improvement to the above technical solution, the supporting component includes an inverted trapezoidal supporting block, and the top surface of the end of the frame is provided with a receiving groove for installing the supporting block.

[0006] As an improvement to the above technical solution, two hydraulic drive mechanisms are symmetrically arranged on both sides of the bearing block. The hydraulic drive mechanism includes a first telescopic hydraulic cylinder and a sliding block connected to the first telescopic hydraulic cylinder. The end face of the sliding block is provided with an inclined surface to match the bearing block. A pipe is connected between the first telescopic hydraulic cylinder and the auxiliary support assembly.

[0007] As an improvement to the above technical solution, the bottom of the receiving groove is provided with a return spring, and the top of the return spring is connected to a lifting block, which abuts against the bottom surface of the bearing block.

[0008] As an improvement to the above technical solution, the auxiliary support assembly includes several arc-shaped support members arranged in a ring. A second telescopic hydraulic cylinder is provided in the middle of the arc-shaped support members. The second telescopic hydraulic cylinder is provided with several telescopic ends. The arc-shaped support members and the telescopic ends are matched one-to-one and the arc-shaped support members are connected to the telescopic ends. The pipe is connected to the second telescopic hydraulic cylinder.

[0009] As an improvement to the above technical solution, the lifting mechanism is rectangular, and the rollers are rotatably connected to the four corners of the bottom surface of the lifting mechanism.

[0010] As an improvement to the above technical solution, each of the rollers is connected to the two opposite end faces of the auxiliary support assembly, and the arc-shaped support members of one auxiliary support assembly are staggered with the arc-shaped support members of another auxiliary support assembly.

[0011] As an improvement to the above technical solution, a pressure valve is connected to the pipeline, and the pressure valve is opened when the load of the lifting mechanism increases to a threshold.

[0012] A method for lifting a stay cable, applied to the aforementioned stay cable lifting device, includes the following steps: S1. Drive the lifting mechanism to move along the frame until the lifting mechanism reaches either end of the frame, so that the lifting mechanism is above the steel box girder; S2. Connect and fix the lifting mechanism to the steel box girder; S3. The lifting mechanism is driven by the gravity of the steel box girder to move the load-bearing components downward. The load-bearing components use a hydraulic drive mechanism to drive the arc-shaped support to extend outward, so that the outer side of part of the arc-shaped support contacts the frame. S4. Drive the lifting mechanism to move along the frame until the lifting mechanism reaches the middle section of the frame; S5. Drive the lifting mechanism to lower the steel box girder and disconnect the lifting mechanism from the steel box girder.

[0013] As an improvement to the above technical solution, in step S4, as the lifting mechanism moves toward the middle section of the frame, the bearing component gradually resets, and the reset is completed before the lifting mechanism leaves the bearing component.

[0014] The beneficial effects of this application are as follows: By linking the displacement feedback of the load-bearing components with the auxiliary support assembly, the device has the ability to "automatically retract under light load and automatically expand under heavy load," improving the system's intelligent responsiveness and adaptability; the auxiliary support assembly assists in bearing the load under heavy load, effectively distributing the force on the rollers, reducing the unit contact pressure between the rollers and the track, extending the roller life, and reducing track wear; under no-load conditions, it avoids friction between excess components and the track, reducing energy consumption and rolling resistance during operation, and improving the overall vehicle operating efficiency; there is no need to increase the number of fixed rollers, and the load-bearing problem is solved through a telescopic structure, avoiding structural uncertainties and installation error accumulation caused by multiple rollers; through dynamic auxiliary support, the overall support stability is improved when lifting large heavy-duty components; The return spring can work with the hydraulic drive mechanism to reset the load-bearing block, that is, push the load-bearing block back to its original height, thus achieving structural self-reset. When an auxiliary support component is in the extended state, there is still a gap between two adjacent arc-shaped support members. Therefore, if the arc-shaped support member of the other auxiliary support component is deflected at a certain angle, when one auxiliary support component rotates to the point where it can no longer provide support due to the gap, the other auxiliary support component can provide support, making the support surface more dense and evenly distributed, further improving stability and load-bearing capacity.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the load-bearing component of the present invention.

[0019] Figure 3 This is another structural schematic diagram of the support component of the present invention.

[0020] Figure 4 This is a schematic diagram of the retracted state of the auxiliary support component of the present invention.

[0021] Figure 5 This is a schematic diagram of the extended state of the auxiliary support component of the present invention.

[0022] Figure 6 This is a schematic diagram of another auxiliary support component of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure of the roller of the present invention.

[0024] Figure 8 This is a schematic diagram of another structure of the roller of the present invention.

[0025] Figure 9 This is a framework diagram of the present invention.

[0026] In the figure: 1. Frame; 2. Lifting mechanism; 3. Bearing component; 4. Roller; 5. Hydraulic drive mechanism; 6. Auxiliary support assembly; 7. Lifting block; 8. Return spring; 11. Receiving groove; 51. First telescopic hydraulic cylinder; 52. Sliding block; 53. Inclined surface; 61. Second telescopic hydraulic cylinder; 62. Arc-shaped support component. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Traditional gantry cranes typically employ a hoisting mechanism 2 mounted on top of the frame 1, using rollers 4 moving along a track to complete the lifting operation. However, when hoisting large, heavy-duty components such as steel box girders, the limited contact area between the rollers 4 of the hoisting mechanism 2 and the track due to the weight of the steel box girder leads to a significant increase in unit contact pressure. This causes wear, indentation, and fatigue damage to the rollers 4 and the track, which can severely impact the operational safety and stability of the entire hoisting system.

[0029] To reduce the load pressure on rollers 4, existing technologies often use the method of increasing the number of rollers 4 to distribute the load. However, this method has many drawbacks: on the one hand, increasing the number of rollers 4 makes the lifting mechanism 2 a multi-point support structure (statically indeterminate system), which places extremely high demands on the consistency of roller installation and the straightness and rigidity of the track; on the other hand, in actual construction or field use environments, the track laying accuracy is difficult to guarantee completely, resulting in multiple rollers 4 not being evenly stressed, which exacerbates the overload failure problem of individual rollers 4.

[0030] Furthermore, when the hoisting mechanism 2 is in an unloaded or low-load operating state, the excess rollers 4 not only fail to provide actual load-bearing capacity but also increase unnecessary frictional resistance and energy consumption due to continuous contact with the track, thus reducing the overall operating efficiency of the lifting equipment. Therefore, how to enhance load-bearing capacity under heavy loads while reducing operating resistance under unloaded or light-load conditions is a key technical problem that urgently needs to be solved for current gantry crane equipment; please refer to [link / reference]. Figures 1-9 The present invention provides some embodiments to solve the above problems, specifically including a cable-stayed hoisting device, including a frame 1, a hoisting mechanism 2, and a retractable auxiliary support assembly 6, which constitute a three-dimensional support structure and serve as the main load-bearing body of the hoisting system. The hoisting mechanism 2 is equipped with rollers 4 and is located on the top of the frame 1. The hoisting mechanism 2 can move in the horizontal direction. Both ends of the frame 1 are equipped with load-bearing components 3. The auxiliary support assembly 6 is connected to the end face of the rollers 4. A hydraulic drive mechanism 5 is connected between the load-bearing components 3 and the auxiliary support assembly 6. As the load of the hoisting mechanism 2 increases, the load-bearing components 3 move downward and drive the auxiliary support assembly 6 from a retracted state to an extended state through the hydraulic drive mechanism 5. The auxiliary support assembly 6 in the extended state, together with the rollers 4, supports the hoisting mechanism 2.

[0031] When the lifting mechanism 2 is in an unloaded or lightly loaded state, the auxiliary support component 6 is in a retracted state and will not contact the frame 1 or the track on the frame 1 to reduce running resistance. When the lifting mechanism 2 lifts heavy objects such as steel box girders, as the load increases, the bearing component 3 sinks slightly. This displacement is triggered by the hydraulic drive mechanism 5, which drives the auxiliary support component 6 to gradually extend and contact the track and participate in the support. Thus, under heavy load, it shares the weight of the lifting mechanism 2 with the main roller 4, effectively reducing the unit pressure on the main roller 4 and reducing the risk of track wear.

[0032] By linking the displacement feedback of the load-bearing component 3 with the auxiliary support component 6, the device has the ability to "automatically retract under light load and automatically expand under heavy load," improving the system's intelligent responsiveness and adaptability. Under heavy load, the auxiliary support component 6 assists in bearing the weight, effectively distributing the force on the rollers 4, reducing the unit contact pressure between the rollers 4 and the track, extending the life of the rollers 4, and reducing track wear. Under no-load conditions, it avoids friction between excess components and the track, reducing energy consumption and rolling resistance during operation, and improving the overall vehicle operating efficiency. There is no need to increase the number of fixed rollers 4; the load-bearing problem is solved through a telescopic structure, avoiding structural uncertainties and installation error accumulation caused by multiple rollers 4. Through dynamic auxiliary support, the overall support stability is improved when lifting large heavy-duty components.

[0033] In some embodiments, the supporting component 3 includes a support block in the shape of an inverted trapezoid. The top surface of the end of the frame 1 is provided with a receiving groove 11 for installing the support block. The bottom of the receiving groove 11 is provided with a return spring 8. The top of the return spring 8 is connected to a lifting block 7. The lifting block 7 abuts against the bottom surface of the support block. Specifically, the receiving groove 11 is used to limit the vertical movement of the support block. The bottom of the groove is provided with a set of return springs 8. The top of each return spring 8 is connected to a lifting block 7. The lifting block 7 abuts against the bottom surface of the support block. The return spring 8 can cooperate with the hydraulic drive mechanism 5 to reset the support block, that is, to push the support block up to the original height, so as to realize the self-resetting of the structure.

[0034] Two hydraulic drive mechanisms 5 are symmetrically arranged on both sides of the load-bearing block. The hydraulic drive mechanism 5 includes a first telescopic hydraulic cylinder 51 and a sliding block 52 connected to the first telescopic hydraulic cylinder 51. The end face of the sliding block 52 is provided with an inclined surface 53 to match the load-bearing block. A pipe is connected between the first telescopic hydraulic cylinder 51 and the auxiliary support assembly 6. It can be understood that when the lifting mechanism 2 causes the load-bearing block to be pressed down due to the lifting of a heavy object, the descent of the load-bearing block triggers the first telescopic hydraulic cylinder 51 to work. The first hydraulic cylinder is connected to the auxiliary support assembly 6 through a hydraulic pipe to transmit hydraulic oil to the auxiliary support structure. Regarding the auxiliary support assembly 6, the auxiliary support assembly 6 includes several arc-shaped support members 62 arranged in a ring. A second telescopic hydraulic cylinder 61 is provided in the middle of the arc-shaped support members 62. The second telescopic hydraulic cylinder 61 has several telescopic ends. The arc-shaped support members 62 are matched and correspond one-to-one with the telescopic ends, and the arc-shaped support members 62 are connected to the telescopic ends. Pipes are connected to the second telescopic hydraulic cylinder 61. Specifically, after the second telescopic hydraulic cylinder 61 receives hydraulic oil from the first telescopic hydraulic cylinder 51, it drives the telescopic ends to extend, causing the arc-shaped support members 62 to change from a retracted state to an open state. Part of the arc-shaped support members 62 contact the frame 1, forming additional load-bearing fulcrums. It should be noted that the first telescopic hydraulic cylinder 51 and the second telescopic hydraulic cylinder 61 are driven by the hydraulic oil of the first telescopic hydraulic cylinder 51, and the first telescopic hydraulic cylinder 51 and the second telescopic hydraulic cylinder 61 are connected to the hydraulic system. Preferably, a pressure valve is connected to the pipeline. The pressure valve opens when the load on the lifting mechanism 2 increases to a threshold value. Specifically, when the actual load on the lifting mechanism 2 reaches a preset threshold value, the pressure valve automatically opens or hydraulic oil forces open the pressure valve, allowing hydraulic oil to flow into the second telescopic hydraulic cylinder 61 to complete the expansion action of the support structure. Conversely, when the load decreases below the threshold value, the pressure valve closes, the hydraulic oil flows back through the hydraulic system, and the auxiliary support structure returns to its original contracted state under the contraction action of the hydraulic cylinder.

[0035] In some embodiments, the lifting mechanism 2 is rectangular, and rollers 4 are rotatably connected to the four corners of the bottom surface of the lifting mechanism 2. Each roller 4 has an auxiliary support component 6 connected to its two opposite end faces. Several arc-shaped support members 62 of one auxiliary support component 6 are staggered with several arc-shaped support members 62 of another auxiliary support component 6. In order to achieve a more uniform support effect, the arc-shaped support members 62 in the two oppositely arranged auxiliary support components 6 are arranged in a staggered manner. It can be understood that there is still a gap between two adjacent arc-shaped support members 62 of one auxiliary support component 6 in the extended state. Therefore, if the arc-shaped support members 62 of the other auxiliary support component 6 are deflected at a certain angle, when one auxiliary support component 6 rotates to the point where it can no longer provide support due to the gap, the other auxiliary support component 6 can provide support, making the support surface more dense and evenly distributed, and further improving stability and load-bearing capacity.

[0036] A method for lifting a stay cable, applied to the aforementioned stay cable lifting device, includes the following steps: S1. Drive the lifting mechanism 2 to move along the frame 1 until the lifting mechanism 2 reaches either end of the frame 1, so that the lifting mechanism 2 is above the steel box girder; S2. Connect and fix the lifting mechanism 2 to the steel box girder; S3. The lifting mechanism 2 is driven by the gravity of the steel box girder to move the bearing component 3 downward. The bearing component 3 uses the hydraulic drive mechanism 5 to drive the arc support 62 to extend outward, so that the outer side of part of the arc support 62 contacts the frame 1. S4. Drive the lifting mechanism 2 to move along the frame 1 until the lifting mechanism 2 reaches the middle section of the frame 1; S5. Drive the lifting mechanism 2 to lower the steel box girder and disconnect the connection between the lifting mechanism 2 and the steel box girder.

[0037] In step S4, as the lifting mechanism 2 moves toward the middle section of the frame 1, the supporting component 3 gradually resets, and the reset is completed before the lifting mechanism 2 leaves the supporting component 3.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] It should be noted that the terms “first”, “second”, etc., used in this document are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A cable-stayed bridge lifting device, characterized in that, The system includes a frame, a lifting mechanism, and a retractable auxiliary support assembly. The lifting mechanism is equipped with rollers and is located on top of the frame. Both ends of the frame have load-bearing components on their top surfaces. The auxiliary support assembly is connected to the end faces of the rollers. A hydraulic drive mechanism connects the load-bearing components and the auxiliary support assembly. As the load of the lifting mechanism increases, the load-bearing components move downwards and drive the auxiliary support assembly from a retracted state to an extended state through the hydraulic drive mechanism. In the extended state, the auxiliary support assembly, together with the rollers, supports the lifting mechanism.

2. The cable-stayed bridge lifting device according to claim 1, characterized in that: The supporting component includes an inverted trapezoidal supporting block, and the top surface of the end of the frame is provided with a receiving groove for installing the supporting block.

3. The cable-stayed bridge lifting device according to claim 2, characterized in that: Two hydraulic drive mechanisms are symmetrically arranged on both sides of the bearing block. Each hydraulic drive mechanism includes a first telescopic hydraulic cylinder and a sliding block connected to the first telescopic hydraulic cylinder. The end face of the sliding block is provided with an inclined surface to match the bearing block. A pipe connects the first telescopic hydraulic cylinder and the auxiliary support assembly.

4. A cable-stayed bridge lifting device according to claim 2, characterized in that: The bottom of the receiving groove is provided with a return spring, and the top of the return spring is connected to a lifting block, which abuts against the bottom surface of the bearing block.

5. A cable-stayed bridge lifting device according to claim 3, characterized in that: The auxiliary support assembly includes several arc-shaped support members arranged in a ring. A second telescopic hydraulic cylinder is provided in the middle of the arc-shaped support members. The second telescopic hydraulic cylinder has several telescopic ends. The arc-shaped support members and the telescopic ends are matched one-to-one and connected to the telescopic ends. The pipe is connected to the second telescopic hydraulic cylinder.

6. A cable-stayed bridge lifting device according to claim 5, characterized in that: The lifting mechanism is rectangular, and the rollers are rotatably connected to the four corners of the bottom surface of the lifting mechanism.

7. A cable-stayed bridge lifting device according to claim 6, characterized in that: Each of the rollers is connected to an auxiliary support assembly on its two opposite end faces, and a plurality of arc-shaped support members of one auxiliary support assembly are staggered with a plurality of arc-shaped support members of another auxiliary support assembly.

8. A cable-stayed bridge lifting device according to claim 5, characterized in that: A pressure valve is connected to the pipeline, and the pressure valve is opened when the load of the lifting mechanism increases to a threshold value.

9. A method for lifting a cable-stayed bridge, applied to the cable-stayed bridge lifting device as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Drive the lifting mechanism to move along the frame until the lifting mechanism reaches either end of the frame, so that the lifting mechanism is above the steel box girder; S2. Connect and fix the lifting mechanism to the steel box girder; S3. The lifting mechanism is driven by the gravity of the steel box girder to move the load-bearing components downward. The load-bearing components use a hydraulic drive mechanism to drive the arc-shaped support to extend outward, so that the outer side of part of the arc-shaped support contacts the frame. S4. Drive the lifting mechanism to move along the frame until the lifting mechanism reaches the middle section of the frame; S5. Drive the lifting mechanism to lower the steel box girder and disconnect the lifting mechanism from the steel box girder.

10. A method for lifting a cable-stayed bridge according to claim 9, characterized in that: In step S4, as the lifting mechanism moves toward the middle section of the frame, the supporting component gradually resets and completes the reset before the lifting mechanism leaves the supporting component.

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