Special lifting appliance for workshop span lifting dead angle and lifting method of special lifting appliance
By designing a special spreader for factory spans, the high cost and safety risks of car cranes in the traditional warehouse roller replacement mode are solved, and efficient and safe roller replacement operations are achieved, which significantly improves operating efficiency and reduces costs.
Patent Information
- Application Number
- CN202510418666.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2025-05-30
AI Technical Summary
The traditional inter-store roller replacement model relies on car cranes, resulting in high usage costs and safety risks. It is impossible to directly lift 42 inlet and outlet rollers, and a complex lifting process is required with the help of a riding crane.
Design a special sling for dead corners of the factory span, including hanging beams, counterweights and hanging lugs. The sling is lifted and moved to above the object to be hoisted by double hook clamping, and is hung to both ends of the object to be hoisted by hanging ropes, and the double hook clamping is controlled to lift up to transport the object to be hoisted to the designated position.
This special spreader significantly improves the working efficiency of roller replacement, avoids the high cost of use and safety risks of car cranes, realizes lifting operations without dead corners, and reduces the direct cost of single roller replacement.
Smart Images
Figure CN120057719A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of lifting tools, and particularly to a special lifting tool for the lifting dead angle of the plant bay and a lifting method thereof. Background Art
[0002] Taking Xichang Steel Vanadium Plate Factory as an example, the inlet and outlet roller tables of its hot rolling heating furnace are distributed between four slab warehouses from the steelmaking area to the hot rolling section. These three slab warehouses are adjacent to each other in pairs, and the workshops between them are supported by columns. Two synchronous double-hook clamp cranes with a lifting capacity of 20 - 20T are equipped between each warehouse area. Between the adjacent warehouses of Slab Warehouse 1, Slab Warehouse 2 and Slab Warehouse 3, the column spacing is 4 meters, and a safety walkway with a height of 2 meters is erected above the feeding roller table. However, due to the limited operation limit of the clamp crane trolley, it is impossible to lift and transport the damaged inlet and outlet slab roller tables between the warehouses.
[0003] All along, the traditional mode of replacing the roller table between warehouses requires the clamp crane to first lift the truck crane to the position of the damaged roller table, and then rely on the truck crane to carry out the lifting and replacement operation of the damaged roller table. For the two-way roller systems from the steelmaking warehouse to Slab Warehouse 3, namely the AB roller table at the inlet end of the heating furnace and the E roller table at the outlet end of the heating furnace, a total of 42 inlet and outlet roller tables cannot be directly lifted by the clamp crane. According to past experience, the replacement period of the roller table is 1 year / time, which means that on average, 42 roller tables between warehouses need to be replaced every year. When carrying out the replacement operation each time, a 25T truck crane must be called, and the single crane shift cost is 1500 yuan. Moreover, the truck crane cannot directly reach the location of the roller table, and it is necessary to use a gantry crane to lift the truck crane from the west side of the slab warehouse to the side of the roller system before the replacement work can be carried out. In this way, new potential safety risks are generated, greatly increasing the difficulty of safety control.
[0004] If the use of the truck crane for the lifting task is abandoned, then a special replacement and lifting platform has to be built, which will cause the labor cost of the replacement operation to increase exponentially. At the same time, new dangerous factors will also be generated during the process of manufacturing the roller table replacement rack, which undoubtedly further raises the labor cost. Summary of the Invention
[0005] Aiming at the above problems, the purpose of the present invention is to provide a special lifting tool for the lifting dead angle of the plant bay and a lifting method thereof, which can not only completely avoid the high use cost of the truck crane, but also significantly improve the operation efficiency of roller table replacement.
[0006] The technical solution adopted by the present invention is as follows:
[0007] A special lifting tool for the dead angle of hoisting in the bay of a factory building, comprising a lifting beam, a counterweight and lifting lugs; the counterweight is fixedly arranged in the middle of the lifting beam; the lifting lugs are respectively fixedly arranged on the left and right sides of the middle of the upper end face of the lifting beam, and the two sides of the lifting lugs are symmetrical about the counterweight.
[0008] Further, the lifting beam is an I-beam.
[0009] Further, tension bars are respectively fixedly arranged between the left and right sides of the lifting beam and the left and right end faces of the counterweight.
[0010] A hoisting method for a special hoisting tool for the dead angle of hoisting in the bay of a factory building, the method comprising the following steps:
[0011] S1. Use a double-hook clamp crane to lift the hoisting tool and move it above the object to be hoisted;
[0012] S2. Hang the two ends of the object to be hoisted on the end of the lifting beam through lifting ropes respectively;
[0013] S3. Control the double-hook clamp crane to rise and transport the object to be hoisted to the designated position.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] Fully verified by a large number of on-site practices, the present invention demonstrates excellent performance advantages and effectively meets the actual needs of production.
[0016] From the perspective of operation convenience, the present invention is exquisitely designed and has a compact structure, fully fitting the complex and changeable on-site working environment. In a specific area where the traveling hook head is difficult to reach due to factors such as space limitation and insufficient working radius, the operator only needs to use a double-hook clamp crane to accurately mount this hoisting tool. With its unique mechanical conduction and balance design, the operator can smoothly and accurately lift the component to be replaced to the preset working position. Whether it is the main body of the roller path or key components such as the reducer closely related to it, efficient and accurate replacement can be achieved, greatly reducing the cumbersome pre-preparation time in the traditional operation mode and significantly improving the overall operation rhythm and operation efficiency.
[0017] Compared with the traditional roll replacement mode that relies on the assistance of truck cranes, the present invention demonstrates significant advantages in terms of application flexibility and cost-effectiveness. Once the spreader is fabricated and completed, it can be strategically placed in the designated storage area beside the two-way roll system according to the production layout and operation frequency requirements. When faced with the task of roll replacement, on-site operators only need to conveniently transport it to the target slab yard, quickly mount it with the double-hook clamp crane, and immediately start the efficient replacement process. This process not only completely gets rid of the complex dispatching and lifting processes of truck cranes, avoiding high-cost and high-risk links such as secondary lifting by gantry cranes due to site restrictions, but also fundamentally reduces a series of high-cost expenditures such as truck crane rental and shift operation, greatly reducing the direct cost of single roll replacement and providing a solid cost control foundation for the long-term stable operation of the enterprise.
[0018] Compared with the traditional emergency plan of erecting a roll replacement frame, the innovation of this lifting tool is even more prominent. Erecting a roll replacement frame not only requires a large amount of manpower and material resources for preliminary preparation, but also during the erection process, due to various factors such as on-site welding technology and material selection, it is extremely easy to have potential safety hazards such as insufficient structural strength and loose welding joints, seriously endangering the lives of on-site operators and the stable operation of equipment and facilities. In addition, the long erection period directly occupies normal production time, resulting in an implicit loss of production efficiency. In sharp contrast, the present invention, with its highly integrated and modular design, resolves the above dilemmas from the source, saving a large amount of labor input and ensuring the rapid and safe progress of each roll replacement operation with its stable and reliable structural design, bringing considerable economic benefits to the enterprise, and at the same time reducing safety risks and enhancing production stability. Brief Description of the Drawings
[0019] Figure 1 is a schematic structural diagram of the use effect of the present invention;
[0020] Figure 2 is a schematic top view structure diagram of the present invention.
[0021] Among them, reference numerals: 1 - lifting beam; 2 - counterweight; 3 - lifting lug; 4 - double-hook clamp crane; 5 - roller; 6 - tension bar. Detailed Embodiment
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating that the device or component must have a specific orientation, be constructed and operated in a specific orientation.
[0024] As Figure 1-2 shown, a special lifting tool for the dead corner of the factory building bay proposed in this embodiment includes a lifting beam 1, a counterweight 2 and a lifting lug 3; the counterweight 2 is fixedly arranged in the middle of the lifting beam 1; the lifting lugs 3 are respectively fixedly arranged on the left and right sides of the middle of the upper end face of the lifting beam 1, and the two sides of the lifting lugs 3 are symmetrical about the counterweight 2.
[0025] Symmetrical tension bars 6 are respectively fixedly arranged between the front and rear ends of the left end face of the counterweight 2 and the front and rear ends of the left part of the lifting beam 1; symmetrical tension bars 6 are respectively fixedly arranged between the front and rear ends of the right end face of the counterweight 2 and the front and rear ends of the right part of the lifting beam 1. And the tension bars 6 on the left part of the lifting beam 1 are symmetrical with the tension bars 6 on the right part.
[0026] Among them, the main body of the lifting beam 1 is made of 1 - 2 I-beams with a length of 12 meters and a specification of 200 mm; the vertical distance between the 4 hook heads of the double-hook clamp crane is 4.5 meters. Measure 2.25 meters accurately from the center point of the lifting beam 1 to the left and right sides respectively, and weld the lifting lugs 3 at the two corresponding positions to ensure stable connection with the double hooks of the double-hook clamp crane 4 and achieve efficient force transmission.
[0027] Correspondingly, the relevant design calculation formula of the lifting tool:
[0028] The entire lifting beam 1 is made of 200 mm I-beam, with a mass of 55 kg / m. The hook spacing of the double-hook clamp crane 4 is 4.5 meters. The left and right hooks are both 3.75 meters away from the end points of the lifting beam 1. For the convenience of operators, the counterweight 2 is set as a fixed type. Between the two hooks, the center of gravity of the counterweight 2 is 2.25 meters away from the left and right hooks.
[0029] Taking the lifting of the roller 5 as an example, usually the weight of the roller 5 < 3000 kg. Assuming the weight of the roller 5 is 3000 kg and using the left side of the lifting beam 1 for the replacement of the roller path hoisting, then the center of gravity uses the left hook as the balance point. The left hook is 3.75 meters away from the lifting point, the left hook is 2.25 meters away from the counterweight, and the length of the left part of the lifting beam 1 on the right side of the left hook is 8.25 meters. According to the lever balance formula calculation:
[0030] F_roller × L_left = F_right × L_right
[0031] (F_roller + F_left_lifting_beam) × 3.75 meters = (F_counterweight × 2.25 meters) + (F_right_lifting_beam × 8.25 meters)
[0032] That is
[0033] F counterweight = [2.25 m × (3000 kg + 55 kg / m) × 3.75 m - 55 kg × 8.25 m] = 4890 kg. Ignoring the weight of the lifting beam, then
[0034] F roller × L left = F counterweight × 2.25 m
[0035] 3000 kg × 3.75 m = F counterweight × 2.25 m
[0036] That is, F counterweight = 5000 kg
[0037] Since the weight of roller 5 is less than 3000 kg, it meets the requirements. For safer lifting, the counterweight is adjusted by 20% according to the lifting requirements, and the counterweight 2 is adjusted to 5500 kg to meet the lifting requirements
[0038] Based on the counterweight requirements accurately calculated in the previous design stage, making full use of waste slab resources, and according to the actual working conditions on site, the counterweight 2 is precisely welded onto the lifting beam 1. During this process, to ensure that the lifting beam 1 has sufficient structural strength to bear the lifting load, various strengthening measures can be flexibly taken, such as adding a lifting beam 1 in a timely manner according to the actual stress situation, or reasonably arranging the tension bars 6 to optimize the internal stress distribution, comprehensively improving the overall rigidity and stability of the lifting tool, and ensuring safety and reliability in complex lifting operations
[0039] There is a 6 - meter spacing area between the slab warehouses. Taking the area between the first and second warehouses as an example, the spacing is 6 meters, and the total length of the designed lifting tool is 12 meters. After deducting the reserved space for the limit operation position of the hook head, there is still 3.5 meters of effective vertical operation distance on each side. When the operation position is close to the first warehouse, the lifting tool is conveniently transferred to the area of the first warehouse, and the crane equipped in the first warehouse is used for lifting operations; conversely, if it is close to the second warehouse side, the crane in the second warehouse is used to perform the tasks of hanging and lifting the lifting tool, so as to ensure that the entire area between the warehouses can be fully covered and dead - angle - free operation can be achieved
[0040] Taking the lifting of roller 5 as an example, the lifting method specifically includes the following steps
[0041] S1. Use the double - hook clamp crane 4 to lift the lifting tool and move it above the roller 5 to be replaced
[0042] S2. At the end of the lifting beam 1, hang it to both ends of the roller 5 to be replaced through two groups of lifting ropes respectively
[0043] S3. Control the double - hook clamp crane 4 to rise and lift the roller 5 to be replaced to the designated position
[0044] Similarly, when lifting the replaced roller 5, the lifting method is the same as the above steps
[0045] Compared with the operation method of replacing the auxiliary roller table with a truck crane: The successful application of the present invention completely abandons the dependence on truck cranes for the replacement of the roller table between warehouses, fundamentally saving the rental and usage costs of truck cranes and avoiding the complicated and high-risk process of hoisting truck cranes. In the past, before the replacement operation, a large amount of manpower and time were required to hoist the truck crane to the designated work station. After the roller table replacement was completed, the truck crane had to be hoisted again to the end of the slab warehouse. This process was not only inefficient but also extremely likely to generate many uncontrollable risk factors due to the cramped site and complex hoisting links. Now, with this special lifting tool, the potential risks brought by the above hoisting links are directly eliminated, greatly improving the safety, smoothness, and efficiency of the operation.
[0046] Compared with the operation method of making a simple roller table replacement rack: In the past, the mode of making a simple roller table replacement rack was adopted. Each time of erection required multiple operators, took a long time, and only one roller table replacement task could be completed each time. If the second roller table needed to be replaced, the roller table replacement rack had to be erected again, which undoubtedly caused a great waste of human resources. At the same time, during the erection process, due to the limitations of on-site conditions and processes, the structural strength of the roller table rack was only determined by estimation. In actual use, there was a high risk of collapse and deformation due to insufficient strength, posing a serious threat to the personal safety of on-site operators. In contrast, now, by directly using the lifting tool for roller table replacement, various dangerous and harmful factors generated during the erection and demolition of the roller table rack are avoided from the source, significantly improving the safety factor of the operation site, ensuring the safety of personnel and equipment, saving human resources, and reducing the labor intensity.
[0047] Cost and operation efficiency optimization: After the present invention is manufactured, whether it is for the AB roller table at the charging end of the heating furnace or the E roller table at the discharging end of the heating furnace, convenient and efficient roller table replacement operations can be realized. The operator only needs to firmly hang the steel wire rope on the lifting tool and quickly hook it to the synchronous double-hook clamp crane 4 according to the operation requirements, and then can flexibly shuttle between the AB / E roller table areas. Moreover, with the billets on the roller system as auxiliary supports, the linkage use between the steelmaking warehouse, slab warehouses 1, 2, and 3 can be realized, greatly expanding the operation scope and flexibility, and significantly reducing the labor cost and operation cost.
[0048] Fully verified by practice, the present invention has significant advantages such as simple structure, convenient operation, safety and reliability. Only by accurately and scientifically calculating the counterweight of the device according to the lever principle and combining with the actual specifications of the hoisted heavy objects and the operation conditions can the safety and stability of the entire hoisting process be ensured.
[0049] In all operation scenarios equipped with synchronous hook cranes, it can be popularized and applied, effectively solving the hoisting problems in special positions and completely eliminating unsafe operation behaviors such as oblique pulling and dragging.
[0050] In the field of modern industrial production, continuous transportation lines are widely distributed in various industrial plants. Whether it is the production process of wire, track, or sheet metal, etc., the continuous transportation lines are often blocked by the supporting columns of the plant, forming special operation areas that cannot be reached by existing cranes.
[0051] Based on the innovative design concept of the present invention, according to the required specifications of heavy objects, the lever principle is flexibly applied for targeted adjustment, and different types of special lifting tools can be quickly customized for hoisting operations in such areas. All of them can achieve the goals of shortening the equipment replacement and maintenance time, reducing costs, and reducing the labor intensity of operators, and have broad prospects for industry promotion.
[0052] Matters not detailed in the present invention are well-known technologies.
[0053] The embodiments described above are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.
Claims
1. A special hoist for lifting blind spots across plant spans, characterized by: The sling comprises a hanging beam, a counterweight and a lifting lug; the counterweight is fixedly arranged in the middle of the hanging beam; the lifting lugs are respectively fixedly arranged on the left and right sides of the middle of the upper end surface of the hanging beam, and the lifting lugs on both sides are symmetrical about the counterweight.
2. The special lifting device for lifting blind spots in factory spans according to claim 1 is characterized by: The hanging beam is an I-beam.
3. The special lifting device for lifting blind spots in factory spans according to claim 1 is characterized by: Tie bars are fixedly arranged between the left and right sides of the hanging beam and the left and right end faces of the counterweight.
4. A method for hoisting a special hoisting device for a dead angle of a plant span according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: S1. Use a double hook clamp to lift the sling and move it above the object to be hoisted; S2, hang the ends of the lifting beam to the two ends of the object to be lifted through the lifting ropes; S3, control the double hook clamp to lift up and transport the object to be hoisted to the designated location.