Adjustable rack for overhauling lifting hook group of hoisting and conveying mechanical equipment
By designing an adjustable stand and using pulleys and chains to fix the hook group, the problem of time-consuming and labor-intensive hook group maintenance is solved, efficient and safe hook group maintenance is achieved, and it is suitable for hook groups of different sizes, reducing equipment maintenance time and costs.
Patent Information
- Application Number
- CN202410320782.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-09-23
AI Technical Summary
In the prior art, when repairing the hook assembly, scaffolds of different sizes need to be erected, which is time-consuming and labor-intensive, and the hook assembly components are easily damaged, resulting in low repair efficiency.
An adjustable platform is designed with two separate triangular movable supports equipped with pulleys, chains and corrugated rubber pads. The pulleys are locked and the chains are fixed to achieve stable fixation and mobile adaptability of the hook group.
It greatly shortens the maintenance time of the hook group, reduces the equipment downtime, improves maintenance efficiency and equipment safety, and reduces manpower and time costs.
Smart Images
Figure CN120680468A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of equipment operation and maintenance, and in particular relates to an adjustable stand for repairing a hook assembly of a lifting and conveying mechanical equipment. Background Art
[0002] Lifting and conveying equipment, such as bridge cranes, port machinery, dock cranes, and loading and unloading machinery, are among the most common electromechanical equipment in industry and are widely used in pillar industries of the national economy, including equipment manufacturing, transportation and logistics, shipbuilding, water conservancy and hydropower construction, and nuclear power construction. During operation, the hook assembly, the lifting and load-bearing component of this lifting and conveying machinery, requires the safety and reliability of all its components. Therefore, the hook assembly's movable pulleys must be regularly inspected, maintained, and disassembled for repair. Because large-tonnage hook assemblies have larger components, maintenance often requires the erection of scaffolding, placing the hook assembly on a stand to facilitate grease replacement and repair of the movable pulleys. To facilitate inspection, maintenance, and disassembly of the hook assembly, an adjustable stand has been designed for hook assembly maintenance on lifting and conveying machinery. This adjustable stand accommodates hook assemblies of varying sizes, facilitating emergency repairs by maintenance personnel. Summary of the Invention
[0003] The purpose of the present invention is to provide an adjustable stand for maintenance of the hook assembly of lifting and conveying mechanical equipment, so as to carry out maintenance work such as replacing grease and wire rope on the hook assembly of the lifting equipment.
[0004] In order to achieve the above object, the technical solution adopted by the present invention is:
[0005] The utility model relates to an adjustable stand for inspecting and repairing a hook assembly of a lifting and conveying mechanical equipment. The adjustable stand comprises two separate triangular movable supports. Each support leg of the support is provided with a set of pulleys. The two supports can be connected and fixed by a chain.
[0006] The width of the support is wider than the width of the hook.
[0007] There is a pulley locking device inside the pulley.
[0008] A corrugated rubber pad is provided at one corner of the upper part of the support.
[0009] The rubber pad is provided with corrugated strips not less than 3 mm in height.
[0010] The top surface of the support has a slope near the outer side.
[0011] Use the pulley under the support to move the support to the appropriate position in advance, move the position of the lifting equipment trolley, move the hook group horizontally to the top of the two supports, and then lower the hook group. After the hook group drops to a distance of half a meter from the support position, stop lowering. At this time, adjust the position of the two supports so that the spacing between the supports matches the size of the hook group cover. The support has a chain box as an accessory. The chain is placed in the chain box. Adjust the closed length of the chain to adapt to the distance enclosed by the hook group and the support, further limit the movement of the support, so that the hook group can be safely and stably fixed on the support, pull out the chain in the chain box, wrap it around and lock it Form a closed loop on the support, place it on the chain table at the middle height of the support, and slowly lower the hook group. When the outer cover of the hook group contacts the corrugated rubber pad on the support, adjust the support position and check the chain status to confirm whether the chain needs to be tightened or loosened. When the hook group falls on the support, adjust the locking length of the chain. When the weight of the hook group falls completely on the support, the chain can restrain the movement of the support on the platform, and carry out maintenance of the hook group or the wire rope lifting equipment. After completing the maintenance work of the lifting equipment, raise the hook group, release the chain, and remove the support in the reverse order of the previous installation of the fixed support.
[0012] The beneficial effects achieved by the present invention are:
[0013] The present invention innovatively utilizes a movable stand, allowing maintenance personnel to easily adjust the stand to suit the size of the hook and the location of the lifting equipment. The stand can adapt to almost any terrain, making it highly adaptable. The present invention has a compact structure and is easy to maintain. The components of the present invention are all common and mature structures in the market, making manufacturing relatively simple. The present invention can reduce or enlarge the support according to user needs to meet the needs of various types of lifting equipment hook assembly maintenance. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a front view of a hook of a lifting and conveying mechanical equipment;
[0015] Figure 2 This is a schematic diagram of an adjustable stand for inspecting and repairing the hook assembly of a lifting and conveying mechanical equipment;
[0016] Figure 3 A three-dimensional diagram of an adjustable stand for inspecting and repairing the hook assembly of a lifting and conveying mechanical equipment;
[0017] Figure 4 It is the left view of the hook of a lifting and conveying mechanical equipment. DETAILED DESCRIPTION
[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] Construction and equipment installation involve extensive equipment transportation. As the load-bearing component of lifting and conveying machinery, the hook assembly must meet extremely high safety and reliability requirements. However, during installation and production, the hook assembly and wire rope often become skewed, causing the hook assembly to bear horizontal tension, which can damage components such as the movable pulley bearings, wire ropes, and anti-slip grooves. In these cases, the crane hook assembly must be lowered to the ground and then raised to repair or replace damaged components. For example, at the Tianwan Nuclear Power Plant, the crane equipment at Units 3 and 4 required lowering and raising the hook assembly 106 times in 2022 due to damaged wire ropes, replacement of movable pulley bearings, damage to anti-slip grooves, replacement of hook assembly grease, or other inspections. Each operation required setting up scaffolding of varying sizes to accommodate the hook assembly's varying lifting capacities. This time-consuming and labor-intensive repetitive work could be completely avoided.
[0020] To address this issue, an adjustable scaffolding system for inspecting and repairing hook assemblies on lifting and conveying machinery has been designed, significantly reducing the time required for hook assembly repairs. On average, erecting a scaffolding system to repair a hook assembly defect requires one shift (8 hours). Using this system, the time required to erect a hook assembly is reduced to 0.06 shifts (0.5 hours), significantly reducing the downtime of the lifting machinery due to maintenance.
[0021] The present invention is an adjustable stand for inspecting and servicing the hook group of a lifting and conveying mechanical equipment. It has pulleys on the legs, which can facilitate the movement of personnel and provide convenience for the inspection and maintenance of different lifting equipment on site. The entire stand is composed of two separate independent movable supports. The top surface has a slope near the outside, which is used to match the slope of the side of the hook group outer cover. It is used to cooperate with the protective side cover of the hook group. The two supports can be connected and fixed by a chain. After the force of the hook group is applied to the support, the support will not move. The present invention is an adjustable stand for inspecting and servicing the hook group of a lifting mechanical equipment. It is composed of two separate supports, a corrugated rubber pad, a chain box, a chain, a pulley and other components.
[0022] The adjustable stand for maintenance of the hook group of this lifting and conveying mechanical equipment is composed of two separate supports. In order to reliably and stably support the hook, the supports are triangular in shape. The width of the support can be designed to be wider than the width of the general hook. The supports shown in the picture are only for reference. There is a set of pulleys on each leg of the support. Only two pulleys are shown in the picture as a reference. In practice, more than four pulleys are needed to ensure stability. The pulleys are assembled to facilitate the movement of the entire stand and to adjust the stand position. In past maintenance experiences, there have been many cases where the maintenance stand was difficult to move. After the pulleys are installed, there is a pulley locking device inside the pulley, which can be fixed in the specified position after moving to the specified position. The installation of pulleys provides great convenience for maintenance. A corrugated rubber pad is added to the upper corner of the support to prevent hard contact between the support and the hook, which could cause damage. Additionally, a corrugated strip no less than 3mm high is added to the rubber to increase friction between the support and the hook, providing an anti-slip effect and securing the hook more securely and stably to the support. The chain box and chain are standard external components, not shown in the figure.
[0023] The specific usage of this device is as follows:
[0024] The first step is to use the pulley under the support to move the support to the appropriate position in advance to facilitate the placement of the hook assembly. There is a locking device on the pulley to prevent the pulley from rolling and ensure that the support cannot move.
[0025] The second step is to move the position of the lifting equipment trolley, move the hook group horizontally to the top of the two supports, and then lower the hook group. After the hook group drops to a distance of half a meter from the support position, stop lowering. At this time, adjust the position of the two supports so that the spacing between the supports and the size of the hook group cover can match each other.
[0026] The third step is that the support has an accessory chain box, in which a complete chain of sufficient length is placed. The chain closing length can be adjusted to adapt to the distance enclosed by the hook group and the support, further limiting the movement of the support so that the hook group can be safely and stably fixed on the support.
[0027] We pull the chain out of the chain box, wrap it around and lock it to form a closed loop, and place it on the chain table at the middle height of the support.
[0028] The fourth step is to slowly lower the hook assembly. When the outer cover of the hook assembly contacts the corrugated rubber pad on the support, adjust the support position and check the chain status to confirm whether the chain needs to be tightened or loosened. When the hook assembly falls onto the support, adjust the locking length of the chain. When the weight of the hook assembly falls completely on the support, the chain can restrain the movement of the support on the platform.
[0029] The fifth step is to inspect the hook group or lifting equipment such as wire ropes.
[0030] In the sixth step, after the maintenance of the lifting equipment is completed, the hook assembly needs to be raised, the chain is released, and the support is removed in the reverse order of the previous installation of the fixed support. Compared with the method of setting up scaffolding to fix the hook assembly, the method of the present invention saves a lot of manpower and time, providing great convenience for the maintenance of the lifting equipment.
[0031] 1. The present invention innovatively adopts the form of a chain fixed support, which makes the support have strong environmental adaptability. The support interval width can be adjusted according to the on-site environment to adapt to hook groups of different sizes. Therefore, the present invention has a high adaptability.
[0032] 2. The present invention can solve the problem of damaged hook groups of various lifting equipment and the inconvenience of replacing damaged wire ropes, and has reference significance for the engineering of lifting machinery.
[0033] 3. The present invention has a compact structure and is easy to maintain.
[0034] 4. All components of the present invention are common and mature structures in the market and are not difficult to manufacture.
[0035] 5. The present invention can reduce or enlarge the size of the replacement wire rope according to user needs, meeting the needs of various types of lifting machinery hook group maintenance and other maintenance.
[0036] 6. The centering pulley design of this invention provides excellent convenience for the movement of the support, requiring minimal space. The support position can be adjusted freely to accommodate the placement of the hook assembly. Compared to immovable devices such as scaffolding, this design offers excellent mobility and convenience. It reduces the overall working time for hook maintenance, shortens the time for a single maintenance project, and reduces the overall maintenance time for the project, thus positively impacting the on-schedule completion of the project.
Claims
1. An adjustable stand for inspecting and repairing the hook assembly of a lifting and conveying mechanical equipment, characterized by: It consists of two separate triangular movable supports with a set of pulleys on each leg of the support, and the two supports can be connected and fixed by a chain.
2. The adjustable stand for maintenance of the hook assembly of a lifting and conveying mechanical equipment according to claim 1 is characterized in that: The width of the support is wider than the width of the hook.
3. The adjustable stand for maintenance of the hook assembly of a lifting and conveying mechanical equipment according to claim 1 is characterized in that: There is a pulley locking device inside the pulley.
4. The adjustable stand for maintenance of the hook assembly of a lifting and conveying mechanical equipment according to claim 1 is characterized in that: A corrugated rubber pad is provided at one corner of the upper part of the support.
5. The adjustable stand for inspecting and repairing the hook assembly of a lifting and conveying mechanical equipment according to claim 4 is characterized in that: The rubber pad is provided with corrugated strips not less than 3 mm in height.
6. The adjustable stand for maintenance of the hook assembly of a lifting and conveying mechanical equipment according to claim 1 is characterized in that: The top surface of the support has a slope near the outer side.
7. The adjustable stand for maintenance of the hook assembly of a lifting and conveying mechanical equipment according to claim 1 is characterized in that: Use the pulley under the support to move the support to the appropriate position in advance, move the position of the lifting equipment trolley, move the hook group horizontally to the top of the two supports, and then lower the hook group. After the hook group drops to a distance of half a meter from the support position, stop lowering. At this time, adjust the position of the two supports so that the spacing between the supports matches the size of the hook group cover. The support has a chain box as an accessory. The chain is placed in the chain box. Adjust the closed length of the chain to adapt to the distance enclosed by the hook group and the support, further limit the movement of the support, so that the hook group can be safely and stably fixed on the support, pull out the chain in the chain box, wrap it around and lock it Form a closed loop on the support, place it on the chain table at the middle height of the support, and slowly lower the hook group. When the outer cover of the hook group contacts the corrugated rubber pad on the support, adjust the support position and check the chain status to confirm whether the chain needs to be tightened or loosened. When the hook group falls on the support, adjust the locking length of the chain. When the weight of the hook group falls completely on the support, the chain can restrain the movement of the support on the platform, and carry out maintenance of the hook group or the wire rope lifting equipment. After completing the maintenance work of the lifting equipment, raise the hook group, release the chain, and remove the support in the reverse order of the previous installation of the fixed support.