A boiler drum utilizes a steel structure to pull into place a jack fixing frame and a beam under the frame base

Abstract

This invention provides a jack fixing frame and a base beam under the frame for lifting and positioning a boiler drum using a steel structure, relating to the field of boiler drum hoisting technology. It includes a base beam under the frame and a jack fixing frame. The base beam is detachably connected to the top of the boiler steel frame body, used to bear the hoisting load of the jack and the boiler drum and transfer it to the boiler steel frame body. The jack fixing frame is installed above the base beam. This invention uses clamping steel beams on both sides of the limiting crossbeam to laterally clamp the boiler steel frame body, and the clamping steel beams of the limiting crossbeam and the clamping bolts to vertically clamp the hoisting longitudinal beam, forming a double fixation. Simultaneously, anti-slip pads are provided at the connection points to effectively prevent displacement and shaking of the base beam during hoisting, significantly improving the stability of the jack and the entire hoisting system, reducing safety hazards, and improving the reliability of the fixation compared to existing simple bolt fixing structures.

Description

Technical Field

[0001] This invention relates to the field of boiler drum hoisting technology, and in particular to a jack fixing frame and a base pressure beam for lifting and positioning a boiler drum using a steel structure. Background Technology

[0002] The boiler drum is a core component of the boiler, and its installation position is usually at a high altitude, making drum hoisting a crucial step in boiler installation. Currently, there are two main methods for boiler drum hoisting: one is direct hoisting using a crane, which is simple to operate and highly efficient, and widely used in the hoisting of small and medium-sized boiler drums; the other is used when the boiler steel frame is installed at a high height or the installation location is limited, and a crane cannot meet the hoisting requirements. In this method, vertical jacks are fixed to the boiler steel frame, and the drum is lifted into place using these jacks. This method allows for separate construction of the boiler steel frame and the drum, without affecting the subsequent drum hoisting, and is increasingly being used in large boiler installation projects. When using wire-core vertical jacks for hoisting, a jack fixing frame and base beam must be installed to ensure the safety and stability of the hoisting process.

[0003] However, existing jack fixing frames and base pressure beams used for lifting boiler drums have the following shortcomings: First, the connection between the base pressure beam and the boiler steel frame is not firm enough, resulting in poor limiting effect. Displacement and swaying are prone to occur during hoisting, affecting the stability of the jack and even posing safety hazards. For example, some existing base pressure beams are only fixed with simple bolts without a dedicated clamping and limiting structure, making them unable to adapt to dynamic loads during hoisting. Second, the load-bearing structure design of the jack fixing frame is unreasonable, with insufficient load-bearing capacity, and no effective reinforcement structure is provided, leaving it subjected to long-term pressure from the jack. The existing technology suffers from several problems: firstly, it is prone to deformation under stress; secondly, the connection between the fixed frame and the base pressure beam is not reliable enough and is prone to loosening; and thirdly, it lacks a dedicated wire rope guiding structure, which makes the wire rope prone to deviation and jamming during the lifting process. This not only affects the lifting efficiency but also aggravates the wear of the wire rope, shortens its service life, and may even lead to wire rope breakage and safety accidents in severe cases. These problems limit the promotion and application of the jack-lifting steam drum lifting technology. Therefore, this invention proposes a jack fixed frame and a base pressure beam under the frame for lifting and positioning the boiler steam drum using a steel structure to solve the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a boiler drum jack fixing frame and a base pressure beam for lifting and positioning using a steel structure. The boiler steel frame body is laterally clamped by clamping steel beams on both sides of the limiting crossbeam. Combined with the pressing steel beams of the limiting crossbeam and the tightening bolts, the lifting longitudinal beam is vertically tightened, forming a double fixation. Simultaneously, anti-slip pads are installed at the connection points to effectively prevent displacement and swaying of the base pressure beam during lifting. This significantly improves the stability of the jack and the entire lifting system, reduces safety hazards, and enhances the reliability of the fixation compared to existing simple bolt fixing structures.

[0005] To achieve the objectives of this invention, the invention is implemented through the following technical solution: a jack fixing frame and a base beam under the frame for lifting and positioning a boiler drum using a steel structure, comprising a base beam under the frame and a jack fixing frame. The base beam under the frame is detachably connected to the top of the boiler steel frame body and is used to bear the lifting load of the jack and the boiler drum and transfer it to the boiler steel frame body. The jack fixing frame is installed above the base beam under the frame and is used to fix the wire-driven jack and guide the lifting wire rope to move smoothly.

[0006] The base beam under the frame includes a limiting crossbeam and two parallel lifting longitudinal beams. The limiting crossbeam is clamped and fixed to the boiler steel frame body, and the lifting longitudinal beams are fastened to the limiting crossbeam. The jack fixing frame is detachably connected to the lifting longitudinal beams. The overall structure is adapted to the installation of the threaded jack and the traction of the lifting wire rope, so as to realize the lifting and positioning of the boiler drum.

[0007] Further improvements include: the limiting beam includes a limiting beam base plate, clamping steel beams on both sides of the limiting beam, a pressing steel beam of the limiting beam, abutting bolts, and nuts. The limiting beam base plate is fitted to the top of the boiler steel frame body. The clamping steel beams on both sides of the limiting beam are symmetrically fixed to both sides of the limiting beam base plate. The pressing steel beam of the limiting beam spans across the clamping steel beams on both sides of the limiting beam, and its upper wing plate has mounting holes for the abutting bolts. The nuts are welded to the bottom wing plate of the pressing steel beam of the limiting beam. The abutting bolts are threadedly connected to the nuts. Tightening the abutting bolts can achieve the abutting and fixing of the hoisting longitudinal beam. Anti-slip pads are provided at the connection points between the limiting beam and the boiler steel frame body and the hoisting longitudinal beam.

[0008] Further improvements include: the lifting longitudinal beam is made of H-beams, with its bottom fitting against the bottom plate of the limiting crossbeam and its sides fitting against the clamping steel beams on both sides of the limiting crossbeam; the wing plates of the lifting longitudinal beam have multiple bolt holes for detachable connection with the limiting crossbeam and the jack fixing frame; the length of the lifting longitudinal beam is adapted to the span of the boiler steel frame and the number of jacks installed; and the spacing between the two lifting longitudinal beams matches the base size of the wire-driven jack.

[0009] A further improvement is made in that: the jack fixing frame includes a load-bearing box plate, a maintenance steel frame, a cable puller, and a cable collector. The load-bearing box plate is installed above the hoisting longitudinal beam. The wire-threaded jack sits on the load-bearing box plate. The maintenance steel frame is fixed to the top of the load-bearing box plate. The cable puller is installed on the upper part of the maintenance steel frame. The cable collector is installed on one side of the top of the maintenance steel frame. The hoisting wire rope passes through the wire-threaded jack, the cable puller, and the cable collector in sequence and is connected to the lifting lug of the boiler drum.

[0010] A further improvement is made in that: the load-bearing box plate includes a bottom plate, stiffening plates, fixing bolts, and an upper top plate of the load-bearing box. The bottom plate of the load-bearing box is attached to the hoisting longitudinal beam and connected to the flange of the hoisting longitudinal beam by fixing bolts. The stiffening plates are vertically connected between the bottom plate and the upper top plate of the load-bearing box and are arranged in an alternating and uniform manner. The upper top plate of the load-bearing box has a hole reserved in the middle for the hoisting wire rope to pass through. The edge of the hole is provided with an arc-shaped transition structure to avoid wear on the hoisting wire rope.

[0011] Further improvements include: the maintenance steel frame includes a frame and a top mounting plate for a cable straightener, a bottom fixing plate for the maintenance frame, and bolt holes. The bottom fixing plate for the maintenance frame is bolted to the upper top plate of the load-bearing box through the bolt holes. The top mounting plate for the cable straightener is fixed to the top of the maintenance steel frame, and the cable straightener is fixed to the top mounting plate for the cable straightener. The middle part of the maintenance steel frame has reserved space for placing a cable-threading jack. The frame is made of welded square steel and has reinforcing diagonal braces on the inner side to improve overall stability.

[0012] Further improvements are made in the following method for lifting and positioning the boiler drum using this device: S1, installing the limiting beam on the top of the boiler steel frame body, adjusting the clamping steel beams on both sides of the limiting beam to fit the boiler steel frame body, and tightening the bolts to fix the limiting beam; S2, installing two lifting longitudinal beams on the limiting beam and tightening them with bolts to ensure that the lifting longitudinal beams are parallel and the spacing meets the requirements; S3, installing the load-bearing box plate on the lifting device with fixing bolts. Above the longitudinal beam, install and secure the reinforcing plate; S4, place the wire-operated jack on the load-bearing box plate, and adjust its position so that the through hole of the jack is aligned with the hole in the upper top plate of the load-bearing box; S5, install the maintenance steel frame, wire guide, and wire collector, and pass the hoisting wire rope through the through hole, wire guide, and wire collector in sequence to connect the boiler drum; S6, start the wire-operated jack and slowly lift the boiler drum, guiding the wire rope smoothly through the wire guide and wire collector until the drum is in place.

[0013] A further improvement is made in S6, where the rated load capacity of the threaded jack meets the hoisting requirements, and its rated load capacity P is calculated according to the following formula: Where P is the rated load capacity of the jack (unit: kN), K is the safety factor, with a value range of 1.2 to 1.5, and G is the weight of the boiler drum (unit: kN). The total weight (in kN) of the lifting accessories, including the lifting wire rope and lifting lugs; the safety factor K needs to be adjusted according to the lifting height and the ambient wind speed. The higher the lifting height and the greater the wind speed, the larger the value of K.

[0014] A further improvement is made in S6, where the tension of a single hoisting wire rope is controlled within a safe range, and the tension T of a single wire rope is calculated using the following formula: Where T is the tension of a single hoisting wire rope (unit: kN), and G is the weight of the boiler drum (unit: kN). The total weight of the lifting accessories is given in kN, n is the number of lifting wire ropes, and θ is the angle between the lifting wire ropes and the vertical direction. When T is greater than the allowable tension of the wire rope, increase the number of wire ropes or adjust the included angle of the wire ropes. .

[0015] Further improvements include: the limiting crossbeam, hoisting longitudinal beam, load-bearing box plate, and maintenance steel frame are all made of Q355B steel, and the surfaces are all treated with anti-corrosion and rust removal. Anti-loosening washers are installed at all bolt connection parts. The rollers of the cable puller are made of wear-resistant rubber material, and a guide bushing is installed inside the cable collector to further reduce the wear of the wire rope.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention uses clamping steel beams on both sides of the limiting crossbeam to laterally clamp the boiler steel frame body, and the pressing steel beams of the limiting crossbeam and the clamping bolts to vertically clamp the lifting longitudinal beam, forming a double fixation. At the same time, anti-slip pads are set at the connection points to effectively prevent displacement and shaking of the base pressure beam during the lifting process, significantly improving the stability of the jack and the entire lifting system, reducing safety hazards, and improving the fixation reliability compared to the existing simple bolt fixing structure.

[0018] 2. This invention features staggered and evenly arranged reinforcing plates between the bottom plate and the top plate of the load-bearing box, enhancing the load-bearing capacity and deformation resistance of the load-bearing box plate. It can effectively withstand the pressure of the jacks and the lifting load of the steam drum. At the same time, the load-bearing box plate and the lifting longitudinal beam are connected by bolts for easy installation, disassembly and maintenance. It is adaptable to the installation requirements of jacks of different specifications, improves the load-bearing capacity, and can meet the lifting requirements of large-tonnage steam drums.

[0019] 3. This invention maintains the steel frame by installing a wire rope straightener and a wire rope collector. The wire rope straightener can laterally limit the wire rope to prevent it from deviating, while the wire rope collector can organize and guide multiple wire ropes to ensure smooth movement. At the same time, the wear-resistant rubber rollers of the wire rope straightener and the guide bushings of the wire rope collector effectively reduce the wear of the wire rope, extend its service life, improve hoisting efficiency, and reduce the amount of wire rope wear. Attached Figure Description

[0020] Figure 1 This is the front view of the present invention;

[0021] Figure 2 This is a schematic diagram illustrating the lifting principle of the present invention;

[0022] Figure 3 This is a schematic diagram of the upper structure of the limiting crossbeam and the hoisting longitudinal beam of the present invention;

[0023] Figure 4 This is a cross-sectional view of the upper structure of the limiting crossbeam and the hoisting longitudinal beam of the present invention;

[0024] Figure 5 This is a cross-sectional view of the installation of the limiting crossbeam and the hoisting longitudinal beam of the present invention;

[0025] Figure 6 This is a top view of the installation of the limiting crossbeam and the hoisting longitudinal beam of the present invention;

[0026] Figure 7 A schematic diagram of the cable straightener mounting top plate and the cable straightener of the present invention;

[0027] Figure 8 This is a schematic diagram of the bottom fixing plate and bolt holes of the maintenance frame of the present invention;

[0028] Figure 9 This is a schematic diagram of the upper top plate of the load-bearing box of the present invention;

[0029] Figure 10 This is a schematic diagram of the stiffening plate of the present invention.

[0030] The components include: 1. Boiler steel frame body; 2. Limiting crossbeam; 21. Limiting crossbeam base plate; 22. Clamping steel beams on both sides of the limiting crossbeam; 23. Pressing steel beams of the limiting crossbeam; 24. Tightening bolts; 25. Nuts; 3. Lifting longitudinal beams; 4. Load-bearing box plate; 41. Load-bearing box base plate; 42. Reinforcing plate; 43. Fixing bolts; 44. Upper top plate of the load-bearing box; 5. Wire-driven jack; 6. Lifting wire rope; 7. Maintenance steel frame; 71. Top plate for cable straightener installation; 72. Cable straightener; 73. Bottom fixing plate of maintenance frame; 74. Bolt holes; 8. Cable collector; 9. Boiler steam drum. Detailed Implementation

[0031] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0032] Example 1

[0033] according to Figure 1-10 As shown in the figure, this embodiment proposes a jack fixing frame and a base pressure beam for lifting and positioning a boiler drum using a steel structure. It is suitable for lifting and positioning a small and medium-sized boiler drum 9. The boiler drum 9 weighs 800kN, the hoisting height is 30m, and the ambient wind speed is ≤5m / s.

[0034] A jack fixing frame and a base beam under the frame are used to lift and position a boiler drum using a steel structure. The jack fixing frame includes a base beam under the frame and a jack fixing frame. The base beam under the frame is detachably connected to the top of the boiler steel frame body 1, and the jack fixing frame is installed above the base beam under the frame.

[0035] The limiting beam 2 is made of Q355B steel welded together. The bottom plate 21 of the limiting beam has a size of 1200mm×300mm×20mm. The clamping steel beams 22 on both sides of the limiting beam are made of channel steel, model 16a. The pressing steel beams 23 of the limiting beam are made of I-beams, model 14a. The tightening bolts 24 are made of M24 high-strength bolts. The nuts 25 are matched with the bolts. The anti-slip pads at the connection parts are made of rubber with a thickness of 5mm.

[0036] The hoisting longitudinal beam 3 is made of H-beam steel, model H200×200×8×12, with a length of 2000mm. The distance between the two hoisting longitudinal beams 3 is 800mm. φ26 bolt holes are opened on the flange plate with a spacing of 200mm.

[0037] The bottom plate 41 and the top plate 44 of the load-bearing box 4 are both made of 20mm thick Q355B steel plate with a size of 800mm×800mm. The stiffening plate 42 is made of 16mm thick steel plate with a size of 800mm×150mm. They are arranged in an alternating pattern with a spacing of 200mm. The fixing bolts 43 are M24 high-strength bolts. The hole diameter of the top plate 44 of the load-bearing box is 100mm, and the radius of the edge arc transition is 10mm.

[0038] The maintenance steel frame 7 is made of welded square steel, with a specification of 80×80×5 and a height of 1500mm. The top mounting plate 71 for the cable straightener and the bottom fixing plate 73 of the maintenance frame are both made of 16mm thick steel plate, with dimensions of 500mm×500mm. Bolt holes 74 are... The cable straightener 72 is a roller type cable straightener, and the roller is made of wear-resistant rubber. The cable collector 8 is a circular cable collector, and the internal guide bushing is made of nylon.

[0039] The rated load capacity of the threaded jack 5 is calculated according to the formula. Calculate, where K=1.2, G=800kN, =50kN, calculated P=1020kN, select a wire-type jack with a rated load capacity of 1200kN; the hoisting wire rope 6 is 6×19S+FC-15.5-1770, with an allowable tension of 120kN, number of ropes n=8, and included angle According to the formula The calculation shows that T≈109.8kN, which is less than the allowable tension and meets the requirements.

[0040] Lifting process: Follow the steps in the above technical plan. After starting the jack, slowly lift the steam drum. The wire rope guides the wire rope smoothly without deviation or jamming. The base pressure beam does not shake. Finally, the steam drum is successfully placed in place. The lifting process is safe and efficient.

[0041] Example 2

[0042] according to Figure 1-10 As shown in the figure, this embodiment proposes a jack fixing frame and a base pressure beam for lifting and positioning a boiler drum using a steel structure. It is suitable for lifting and positioning a medium and large boiler drum 9. The boiler drum 9 weighs 1500kN, the hoisting height is 45m, and the ambient wind speed is ≤8m / s.

[0043] The difference between this embodiment and Embodiment 1 is as follows: the bottom plate 21 of the limiting beam 2 has dimensions of 1500mm×350mm×25mm; the clamping steel beams 22 on both sides of the limiting beam are 20a channel steel; the pressing steel beams 23 of the limiting beam are 16a I-beams; and the clamping bolts 24 are M30 high-strength bolts; the hoisting longitudinal beam 3 has a model number of H250×250×10×14 and a length of 2500mm. The spacing is 1000mm; the bottom plate and top plate of the load-bearing box 4 are 1000mm×1000mm in size and 25mm thick; the stiffening plate 42 is 20mm thick and 1000mm×200mm in size, with a spacing of 180mm; the maintenance steel frame 7 is made of 100×100×6 square steel and has a height of 1800mm; in the rated load calculation of the wire-driven jack 5, K=1.4 and G=1500kN. =80kN, calculated P=2212kN, select a wire jack with a rated load capacity of 2500kN; hoisting wire ropes 6, number n=12, included angle The calculated value is T≈133.5kN. A wire rope with an allowable tension of 150kN is selected, which meets the requirements.

[0044] During the hoisting process, the base pressure beam was firmly fixed, the load-bearing box plate was not deformed, the wire rope moved smoothly without obvious wear, the gas drum was lifted steadily, and the positioning accuracy was high, which fully met the hoisting requirements of medium and large gas drums.

[0045] Example 3

[0046] according to Figure 1-10 As shown in the figure, this embodiment proposes a jack fixing frame and a base pressure beam for lifting and positioning a boiler drum using a steel structure. It is suitable for lifting and positioning a large boiler drum 9, which weighs 2200kN, has a lifting height of 60m, and an ambient wind speed of ≤10m / s.

[0047] The difference between this embodiment and embodiments one and two is as follows: the bottom plate 21 of the limiting beam 2 has dimensions of 1800mm×400mm×30mm; the clamping steel beams 22 on both sides of the limiting beam are 24a channel steel; the pressing steel beams 23 of the limiting beam are 20a I-beams; and the clamping bolts 24 are M36 high-strength bolts; the hoisting longitudinal beams 3 are H300×300×10×15, with a length of 3000mm and a spacing of 1200mm; the bottom plate of the load-bearing box plate 4... The upper top plate measures 1200mm × 1200mm and is 30mm thick. The reinforcing slabs (42) are 25mm thick, 1200mm × 250mm in size, and spaced 150mm apart. The number of reinforcing slabs has been increased to eight to enhance load-bearing capacity. The maintenance steel frame (7) is made of 120×120×8 square steel with a height of 2000mm. Two reinforcing diagonal braces have been added between the frames to improve stability. The rated load-bearing capacity of the wire-driven jack (5) is calculated as K=1.5 and G=2200kN. =100kN, calculated P=3450kN, select a wire jack with a rated load capacity of 4000kN; hoisting wire ropes 6, number n=16, included angle The calculated value is T≈144.3kN. A wire rope with an allowable tension of 160kN is selected, which meets the requirements.

[0048] During the hoisting process, the double-fixed structure ensured that the base pressure beam did not shift, the stiffening plate effectively distributed the load, the load-bearing box plate did not deform, and the wire rope guide and hub effectively guided the wire rope to avoid deviation and jamming. Even under high wind speeds, the hoisting system remained stable, the steam drum was successfully positioned, and both hoisting efficiency and safety were effectively guaranteed.

[0049] Validation data:

[0050] This invention has undergone practical application testing in three embodiments, and all performance indicators are superior to existing technologies. Specific data are as follows: the connection reliability between the base beam and the boiler steel frame is improved by more than 60% compared to existing technologies; there is no displacement or swaying during hoisting; the jack fixing deviation is ≤2mm, meeting hoisting accuracy requirements; the load-bearing capacity of the load-bearing box plate is improved by more than 40% compared to existing structures, capable of withstanding steam drum hoisting loads of 2200kN and above without deformation or damage; during hoisting, the wire rope exhibits no deviation or jamming, and the smoothness of movement is improved by more than 30%. Rope wear is reduced by more than 50%, and service life is extended by more than 100%. Compared with existing equipment, hoisting efficiency is increased by more than 30%, and the hoisting and positioning time for small and medium-sized steam drums is shortened to 4-6 hours, while the hoisting and positioning time for large steam drums is shortened to 8-10 hours. All components are made of Q355B steel and treated with anti-corrosion coating, with a service life of more than 15 years, which is more than 5 years longer than existing equipment. It can be used with boiler drums of different weights (800kN-2200kN) and different hoisting heights (30m-60m), and is compatible with different specifications of wire-driven jacks, making it highly versatile.

[0051] The boiler drum utilizes a steel-structured jack mounting frame and a base pressure beam to laterally clamp the boiler steel frame body 1 via clamping steel beams 22 on both sides of the limiting crossbeam. This, combined with the clamping steel beams 23 of the limiting crossbeam and the tightening bolts 24, vertically clamps the lifting longitudinal beam 3, forming a double fixation. At the same time, anti-slip pads are installed at the connection points to effectively prevent displacement and shaking of the base pressure beam during lifting. This significantly improves the stability of the jack and the entire lifting system, reduces safety hazards, and enhances the reliability of the fixation compared to existing simple bolt fixing structures. This invention features staggered and evenly arranged reinforcing plates 42 between the bottom plate 41 and the top plate 44 of the load-bearing box, enhancing the load-bearing capacity and deformation resistance of the load-bearing box plate 4. This effectively withstands the pressure of the jacks and the lifting load of the steam drum. Simultaneously, the load-bearing box plate 4 and the lifting longitudinal beam 3 are detachably connected by bolts, facilitating installation, disassembly, and maintenance. This adapts to the installation requirements of jacks of different specifications, improving load-bearing capacity and meeting the lifting needs of large-tonnage steam drums. Furthermore, this invention utilizes a maintenance steel frame 7 to install a wire rope straightener 72 and a wire rope collector 8. The wire rope straightener 72 provides lateral restraint to prevent wire rope deviation, while the wire rope collector 8 organizes and guides multiple wire ropes, ensuring smooth wire rope movement. Additionally, the wear-resistant rubber rollers of the wire rope straightener 72 and the guide bushings of the wire rope collector 8 effectively reduce wire rope wear, extend wire rope service life, improve lifting efficiency, and reduce wire rope wear.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A jack fixing frame and a base beam under the frame for lifting and positioning a boiler steam drum using a steel structure, comprising a base beam under the frame and a jack fixing frame, characterized in that: The under-frame base pressure beam is detachably connected to the top of the boiler steel frame body (1) to bear the lifting load of the jack and steam drum and transfer it to the boiler steel frame body (1); the jack fixing frame is installed above the under-frame base pressure beam to fix the wire-driven jack (5) and guide the lifting wire rope (6) to move smoothly. The base pressure beam under the frame includes a limiting crossbeam (2) and two parallel lifting longitudinal beams (3). The limiting crossbeam (2) is clamped and fixed to the boiler steel frame body (1). The lifting longitudinal beam (3) is tightly connected to the limiting crossbeam (2). The jack fixing frame is detachably connected to the lifting longitudinal beam (3). The overall structure is adapted to the installation of the threaded jack (5) and the traction of the lifting wire rope (6), so as to realize the lifting and positioning of the boiler drum (9).

2. The boiler drum steam drum using a steel-structured lifting and positioning jack fixing frame and its underlying base pressure beam as described in claim 1, characterized in that: The limiting beam (2) includes a limiting beam base plate (21), clamping steel beams (22) on both sides of the limiting beam, a pressing steel beam (23) of the limiting beam, a clamping bolt (24) and a nut (25). The limiting beam base plate (21) is fitted to the top of the boiler steel frame body (1). The clamping steel beams (22) on both sides of the limiting beam are symmetrically fixed to both sides of the limiting beam base plate (21). The pressing steel beam (23) of the limiting beam spans across the bottom of the boiler. Above the clamping steel beams (22) on both sides of the limiting beam, the upper wing plate is provided with mounting holes for the clamping bolts. The nut (25) is welded to the bottom wing plate of the clamping steel beam (23) of the limiting beam. The clamping bolt (24) is threadedly connected to the nut (25). Tightening the clamping bolt (24) can achieve the clamping and fixing of the hoisting longitudinal beam (3). The connection parts of the limiting beam (2) with the boiler steel frame body (1) and the hoisting longitudinal beam (3) are all provided with anti-slip pads.

3. The boiler drum steam drum using a steel-structured lifting and positioning jack fixing frame and its underlying base pressure beam as described in claim 2, characterized in that: The hoisting longitudinal beam (3) is made of H-beams. Its bottom is attached to the bottom plate (21) of the limiting crossbeam, and its sides are attached to the clamping steel beams (22) on both sides of the limiting crossbeam. The wing plate of the hoisting longitudinal beam (3) has multiple bolt holes for detachable connection with the limiting crossbeam (2) and the jack fixing frame. The length of the hoisting longitudinal beam (3) is adapted to the span of the boiler steel frame body (1) and the number of jacks installed. The spacing between the two hoisting longitudinal beams (3) matches the base size of the wire-type jack (5).

4. The boiler drum steam drum using a steel-structured lifting and positioning jack fixing frame and its underlying base pressure beam as described in claim 3, characterized in that: The jack fixing frame includes a load-bearing box plate (4), a maintenance steel frame (7), a cable puller (72), and a cable collector (8). The load-bearing box plate (4) is installed above the hoisting longitudinal beam (3). The wire-through jack (5) sits on the load-bearing box plate (4). The maintenance steel frame (7) is fixed to the top of the load-bearing box plate (4). The cable puller (72) is installed on the upper part of the maintenance steel frame (7). The cable collector (8) is installed on one side of the top of the maintenance steel frame (7). The hoisting wire rope (6) passes through the wire-through jack (5), the cable puller (72), and the cable collector (8) in sequence and is connected to the lifting lug of the boiler drum (9).

5. The boiler drum steam drum using a steel-structured lifting and positioning jack fixing frame and its underlying base pressure beam as described in claim 4, characterized in that: The load-bearing box plate (4) includes a bottom plate (41), a stiffening plate (42), fixing bolts (43), and an upper top plate (44) of the load-bearing box. The bottom plate (41) of the load-bearing box is attached to the hoisting longitudinal beam (3) and connected to the wing plate of the hoisting longitudinal beam (3) by fixing bolts (43). The stiffening plate (42) is vertically connected between the bottom plate (41) of the load-bearing box and the upper top plate (44) of the load-bearing box, and is arranged in an alternating and uniform manner. The upper top plate (44) of the load-bearing box has a hole reserved in the middle for the hoisting wire rope (6) to pass through. The edge of the hole is provided with an arc transition structure to avoid wear on the hoisting wire rope (6).

6. The jack fixing frame and the base pressure beam under the frame for lifting and positioning a boiler drum using a steel structure, as described in claim 5, is characterized in that: The maintenance steel frame (7) includes a frame and a top plate (71) for mounting a cable straightener on the frame, a bottom fixing plate (73) for the maintenance frame, and bolt holes (74). The bottom fixing plate (73) for the maintenance frame is bolted to the upper top plate (44) of the load-bearing box through the bolt holes (74). The top plate (71) for mounting a cable straightener is fixed to the top of the maintenance steel frame (7). The cable straightener (72) is fixed to the top plate (71) for mounting a cable straightener. The middle part of the maintenance steel frame (7) is reserved for placing a cable-threading jack (5). The frame is made of square steel welded together and reinforced diagonal bracing is provided on the inner side to improve the overall stability.

7. The jack fixing frame and the base pressure beam of the boiler drum using a steel structure for lifting and positioning, as described in claim 6, is characterized in that: The method for lifting and positioning the boiler drum using this device includes the following steps: S1, installing the limiting beam (2) on the top of the boiler steel frame body (1), adjusting the clamping steel beams (22) on both sides of the limiting beam to fit against the boiler steel frame body (1), and tightening the abutment bolts (24) to fix the limiting beam (2); S2, installing two lifting longitudinal beams (3) on the limiting beam (2), and tightening them with bolts to ensure that the lifting longitudinal beams (3) are parallel and the spacing meets the requirements; S3, installing the load-bearing box plate (4) above the lifting longitudinal beam (3) with fixing bolts (43), and installing the reinforcing plate. (42) and tighten; S4, place the threaded jack (5) on the load-bearing box plate (4), adjust the position so that the through hole of the jack is aligned with the hole of the upper top plate (44) of the load-bearing box; S5, install the maintenance steel frame (7), the wire puller (72) and the wire collector (8), and pass the hoisting wire rope (6) through the through hole, the wire puller (72) and the wire collector (8) in sequence, and connect it to the boiler drum (9); S6, start the threaded jack (5), slowly lift the boiler drum (9), and guide the wire rope to travel smoothly through the wire puller (72) and the wire collector (8) until the drum is in place.

8. The jack fixing frame and the base pressure beam of the boiler drum using a steel structure for lifting and positioning, as described in claim 7, is characterized in that: In S6, the rated load capacity of the wire-type jack (5) meets the hoisting requirements, and its rated load capacity P is calculated according to the following formula: Where P is the rated load capacity of the jack (unit: kN), K is the safety factor, with a value range of 1.2 to 1.5, and G is the weight of the boiler drum (9) (unit: kN). The total weight of the lifting accessories, including the lifting wire rope (6) and the lifting lugs (unit: kN); the value of the safety factor K needs to be adjusted according to the lifting height and the ambient wind speed. The higher the lifting height and the greater the wind speed, the larger the value of K.

9. The jack fixing frame and the base pressure beam of the boiler drum using a steel structure for lifting and positioning, as described in claim 8, is characterized in that: In S6, the tension of a single hoisting wire rope (6) is controlled within a safe range, and the tension T of a single wire rope is calculated according to the following formula: Where T is the tension of a single hoisting wire rope (6) (unit: kN) and G is the weight of the boiler drum (9) (unit: kN). The total weight of the lifting accessories is given in kN, and n is the number of lifting wire ropes (6). The angle between the hoisting wire rope (6) and the vertical direction When T is greater than the allowable tension of the wire rope, increase the number of wire ropes or adjust the included angle of the wire ropes. .

10. The jack fixing frame and the base pressure beam of the boiler drum using a steel structure for lifting and positioning, as described in claim 4, is characterized in that: The limiting crossbeam (2), hoisting longitudinal beam (3), load-bearing box plate (4) and maintenance steel frame (7) are all made of Q355B steel, and the surface is treated with anti-corrosion and rust removal. Anti-loosening washers are provided at each bolt connection part. The roller of the cable puller (72) is made of wear-resistant rubber material. The cable collector (8) is equipped with a guide bushing to further reduce the wear of the wire rope.

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