A method of installing a steel coal bucket

Abstract

The application relates to the technical field of steel structure installation and construction of thermal power plants, in particular to a steel coal hopper installation method, which comprises the following steps: coal hopper segmentation prefabrication: the coal hopper is divided into an upper hopper body section, a lower hopper body section and a cone section; lower hopper body section hoisting: hoisting the lower hopper body section to a coal hopper beam; cone penetration: hoisting the cone section so that the cone section penetrates through the lower hopper body section; upper hopper body section hoisting: hoisting the upper hopper body section to the lower hopper body section and welding the upper hopper body section and the lower hopper body section; finishing: welding the upper end of the cone section and the lower end of the lower hopper body section. The application adopts an inverse sequence penetration mode of "first middle, then lower and finally upper" to complete the segmented hoisting of the square-to-round transition steel coal hopper, and solves the problems that the traditional hoisting sequence cannot independently support the cone and it is difficult to perform high-altitude butt welding.

Description

Technical Field

[0001] This application relates to the field of steel structure installation and construction technology in thermal power plants, and in particular to a method for installing a steel coal hopper. Background Technology

[0002] Steel coal hoppers are crucial equipment in the fuel conveying system of thermal power plants. Their primary function is to receive and store coal from the raw coal bunker, and then stably and continuously transport it to the coal mill. Their structure is typically inverted conical or square pyramidal, welded from high-quality steel plates, with smooth inner walls and anti-clogging devices to ensure smooth coal flow. Large steel coal hoppers can weigh over a hundred tons each, making them impossible to install as a whole; instead, they are installed in sections.

[0003] Currently, Chinese invention patent application CN118770779A, published on October 15, 2024, proposes a reverse splicing and hoisting steel funnel for a coal blending silo and a construction method thereof. The structure includes: N splicing layers spliced ​​sequentially from bottom to top along the vertical direction, with smooth transition welding between adjacent splicing layers, the radial dimensions of the N splicing layers increasing sequentially, and the Nth splicing layer being welded to the top of the silo; each splicing layer is a funnel-shaped structure that is larger at the top and smaller at the bottom.

[0004] The steel hoppers of the coal blending silo are modularly assembled along the axial and circumferential directions. Each splicing layer is assembled and welded in the enclosed space at the bottom of the coal blending silo. Adjacent splicing layers are then assembled and hoisted in reverse from bottom to top, allowing the steel hoppers to be assembled and hoisted in a confined space.

[0005] Regarding the aforementioned technologies, the traditional segmented hoisting sequence typically adopts a "bottom-up" approach, that is, first hoisting the conical section and supporting it on a temporary support, and then hoisting the upper bucket body section. However, in actual construction, the square-to-round transition cone, due to its special inverted cone structure, has an unstable center of gravity. If it is directly supported on the coal bucket beam, independent and reliable stable support cannot be achieved, posing significant safety risks and construction difficulties. Summary of the Invention

[0006] This application provides a method for installing a steel coal hopper, which uses a reverse sequence of "middle first, then bottom, then top" to complete the segmented hoisting of the square-round transition steel coal hopper, solving the problems of the traditional hoisting sequence where the cone cannot be independently supported and high-altitude welding is difficult.

[0007] A method for installing a steel coal hopper, comprising: Coal hopper segmented prefabrication: The coal hopper is divided into the upper part of the hopper body, the lower part of the hopper body, and the cone section; Lower section hoisting: Hoist the lower section of the bucket body onto the coal bucket beam; Cone section installation: Hoist the cone section and pass it through the lower section of the bucket body; Upper bucket body hoisting: Hoist the upper bucket body onto the lower bucket body, and weld the upper bucket body to the lower bucket body; Finishing: Weld the upper end of the cone section to the lower end of the lower section of the bucket body.

[0008] By adopting the above technical solution, the pre-positioning of the lower section of the bucket not only provides a smooth passage for the conical section but also serves as a temporary support benchmark for the conical section, eliminating the need for a separate high-altitude support frame. The reverse-sequence installation process transforms the original high-altitude circumferential seam connection between the conical section and the lower section of the bucket into a relatively enclosed and stable environment inside the bucket, significantly improving working conditions. Internal operations are less affected by external factors such as wind loads, facilitating precise alignment and welding quality control, thus improving installation accuracy and enhancing construction safety.

[0009] Optionally, the lower section of the bucket body includes several support rods, and the same number of embedded parts as the support rods are pre-embedded in the coal bucket beam. The support rods abut against the embedded parts and are fixedly connected by welding.

[0010] By adopting the above technical solution, the load of the lower section of the bucket body can be effectively transferred to the embedded parts in the coal bucket beam through the support rod, and then distributed to the main structure, which enhances the stability and load-bearing capacity of the overall structure. At the same time, the on-site welding method facilitates construction adjustment and helps to ensure installation accuracy and connection strength.

[0011] Optionally, the lower section of the bucket body further includes guide blocks in the same number as the support rods. The guide blocks are disposed on the support rods, and the embedded part has a guide groove, into which the guide blocks are inserted.

[0012] By adopting the above technical solution, during the hoisting and positioning process of the lower section of the bucket body, each guide block can be aligned and placed into the corresponding guide groove, thereby achieving the initial positioning and guidance of the lower section of the bucket body, ensuring that it can be quickly and accurately aligned during installation, and improving installation efficiency and structural docking accuracy.

[0013] Optionally, when hoisting the lower section of the bucket body, several detachable movable lifting lugs are used. The detachable movable lifting lugs include movable lifting lugs, pins, and locking components. The lower section of the bucket body has several waist-shaped holes, and the pins pass through the waist-shaped holes and are locked to the movable lifting lugs by the locking components.

[0014] By adopting the above technical solution, when using the detachable movable lifting lug, the locking device is removed, the pin is taken out of the movable lifting lug, the movable lifting lug is aligned with the oblong hole, the pin is passed through the oblong hole and the movable lifting lug, and the locking device is used to fix the pin and the movable lifting lug. This achieves quick and reliable connection and separation between the lifting lug and the lower section of the bucket body. The oblong hole provides the necessary adjustment margin to handle minor alignment deviations. The detachable design avoids the subsequent gas cutting and grinding process required for traditional welding and fixing of the lifting lug, which not only protects the integrity of the base material and improves construction efficiency, but also eliminates the safety hazards of high-altitude cutting operations, and allows the lifting lug to be reused, saving construction costs.

[0015] Optionally, the conical segment includes four rounded corner plates, four triangular plates, and a square top frame. The rounded corner plates are disposed on the waist of the triangular plates, and the square top frame is disposed on the bottom edge of the triangular plates. The bottom of the conical segment is circular, and the top part is square.

[0016] By adopting the above technical solutions, the traditional square-to-round coal hopper, with its right-angle splicing structure at the four corners, suffers from dead angles at these points, making it easy for coal dust and wet coal to accumulate, arch, and stick to the walls, leading to frequent coal blockages. The conical section uses independent rounded corner plates to replace right-angle welds, ensuring all four corners are smooth, rounded surfaces with no sharp angles or dead angles. This allows for smooth coal descent, eliminating coal accumulation, sticking, and blockages at the structural source and significantly reducing the workload of cleaning and maintenance. The square-to-round diameter transition area is a high-stress concentration zone. Traditional straight-plate right-angle structures suffer from concentrated welds and stress, making them prone to bulging and weld cracking under long-term coal impact. In the conical section, four triangular plates and four rounded corner plates alternately close. The triangular plates utilize the stable force-bearing characteristics of triangles, while the rounded corner plates form a continuous arc-shaped reinforcing structure, evenly distributing structural stress at the diameter transition area, improving overall rigidity and vibration resistance, and effectively preventing deformation and weld cracking under long-term loads. The rounded corner plates and triangular plates are neatly spliced ​​together, with a smooth and continuous transition, without any uneven steps. The coal flow is stable, with no turbulence or local eddy dust accumulation, effectively reducing dust and coal powder disturbance during the coal falling process and improving on-site environmental protection conditions.

[0017] Optionally, expansion joints are provided at the four corners of the square top frame.

[0018] By adopting the above technical solution, during assembly, the upper end diameter of the conical section is relatively close to the corresponding installation part size of the lower section of the bucket body. Direct insertion might cause interference. By setting expansion joints, the upper end of the conical section can undergo slight elastic deformation through the gaps at the four corners when subjected to external installation forces, thereby achieving radial fine-tuning and repositioning. This not only facilitates the smooth insertion of the conical section into the lower section of the bucket body, but also allows it to recover its original shape through material elasticity after assembly, maintaining a tight fit with the lower section of the bucket body, thus improving assembly efficiency and connection reliability.

[0019] Optionally, the conical section further includes four pull ring plates and several conical pull rings, the pull ring plates being disposed on the square top frame, and the conical pull rings being disposed on the pull ring plates.

[0020] By adopting the above technical solution, if the outer edge of the square top frame is slightly too large due to installation errors or structural interference during the downward insertion of the conical section into the lower section of the bucket body, preventing it from passing smoothly through the lower section, multiple manual hoists can be used for adjustment. Specifically, the hooks at both ends of each manual hoist are hooked onto the conical pull rings on two opposing pull ring plates, forming a symmetrical force arrangement. Then, these manual hoists are operated synchronously to gradually tighten the chain, applying a horizontal inward pulling force to the square top frame through the pull ring plates. Under this tightening force, the square top frame undergoes controllable elastic deformation, with its four corners slightly contracting inward, thus reducing the width of the originally reserved deformation joint. The outer contour dimension of the entire conical section's upper opening can shrink by approximately -mm. This temporary dimensional adjustment is sufficient to allow it to pass smoothly through the constrained space of the lower section of the bucket body. After the conical section is in place, all manual hoists are slowly released and removed, and the square top frame automatically returns to its original shape and size due to the material's elasticity. Finally, after confirming that the position is accurate, the expansion joint can be welded and fixed, thus completing the installation of this section. This facilitates the installation of the conical section.

[0021] Optionally, the conical pull ring is tightened using a tensioning fixture, which includes a mounting plate and a rotating body. The rotating body is rotatably mounted on the mounting plate, and one hook of the manual hoist is hooked onto the rotating body, while the other hook is hooked onto the mounting plate.

[0022] By adopting the above technical solution, the conical pull rings at both ends of the connecting ring plate are connected to the rotating body via steel wire ropes. Tightening the manual hoist causes it to rotate, which in turn moves the steel wire rope, pulling the conical pull rings. This applies a horizontal inward pulling force to the square top frame through the pull ring plate, reducing the number of manual hoists required and effectively achieving the folding and adjustment of the square top frame. Compared to the traditional method of using multiple manual hoists simultaneously, this solution significantly reduces the number of manual hoists used through a mechanical linkage structure, improving operational efficiency and reducing equipment costs while ensuring construction accuracy.

[0023] Optionally, the tensioning fixture further includes four connecting rods and four connecting wire ropes. The connecting rods are slidably mounted on the mounting plate, and one end of each connecting wire rope is connected to the connecting rod, while the other end is connected to the rotating body.

[0024] By adopting the above technical solution, each conical pull ring on the connecting pull ring plate is connected to a connecting rod via a steel wire rope, and the steel wire ropes on the same pull ring plate are kept horizontal. Tightening the manual hoist causes the rotating body to rotate, which in turn moves the connecting steel wire rope. The connecting steel wire rope pulls the connecting rod, and the four connecting rods move synchronously. The connecting rod pulls the steel wire rope, which in turn pulls the conical pull ring. This tension is applied evenly and comprehensively to the sides of the square top frame through the pull ring plate, achieving stable and controllable tightening and fixing of the entire frame structure.

[0025] Optionally, it also includes temporary welding of the cone to the lower section of the bucket body. After the cone section passes through the lower section of the bucket body, while the hoisting equipment is not unhooked, fine adjustment is used to align it, and several stiffening plates are used to temporarily weld the upper opening of the cone section to the lower opening of the lower section of the bucket body.

[0026] By adopting the above technical solutions, the relative position of components can be effectively controlled during hoisting, preventing displacement caused by wind or operational swaying. At the same time, it provides a reliable alignment benchmark for subsequent formal welding, improving installation accuracy and construction safety.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The reverse-sequence assembly process employed in this invention transforms the circumferential seam connection operation, originally located at high altitude between the conical section and the lower section of the bucket body, into an operation conducted within the relatively enclosed and stable environment inside the bucket body, significantly improving working conditions. Internal operations are less affected by external factors such as wind loads, facilitating precise alignment and welding quality control, thus improving installation accuracy and enhancing the safety of the construction process.

[0028] 2. This invention utilizes the gap structure at the four corners to achieve slight elastic deformation, thereby enabling radial fine-tuning and clearance. This not only facilitates the smooth insertion of the conical section into the lower section of the bucket body, but also allows the material to elastically restore its original shape after assembly, maintaining a tight fit with the lower section of the bucket body, thus improving assembly efficiency and connection reliability.

[0029] 3. The conical section of this invention uses four triangular plates and four rounded corner plates to enclose the upper square top frame, forming an upper circular structure. On the one hand, the rounded corner plates eliminate dead corners where coal accumulates, effectively preventing coal powder from sticking to the wall and blocking material. On the other hand, the combination of triangular plates and rounded corner plates enhances the overall structural strength of the coal hopper and disperses stress at the point where the square changes to a circle and the diameter changes. At the same time, the modular disassembly of components facilitates prefabrication in the factory, adapts to the bottom-up segmented inverted construction of steel coal hoppers, and improves the accuracy of on-site assembly and docking and the safety of hoisting. Attached Figure Description

[0030] Figure 1 This is a flowchart of the installation process according to an embodiment of this application; Figure 2This is a schematic diagram of the three-dimensional structure of the coal hopper according to an embodiment of this application; Figure 3 This is a partial exploded view of an embodiment of this application; Figure 4 This is a partial three-dimensional structural diagram of the lower section of the bucket body and the detachable movable lifting lugs according to an embodiment of this application; Figure 5 This is a schematic diagram of the three-dimensional structure of the conical segment and the tensioning fixture according to an embodiment of this application; Figure 6 This is a three-dimensional structural diagram of an embodiment of this application.

[0031] Figure label: 100. Upper part of the bucket body; 110. Upper bucket body; 120. Top cover; 130. Upper hanging lugs; 200. Lower section of bucket body; 210. Lower bucket body body; 220. Support rod; 230. Guide block; 240. Waist-shaped hole; 250. Reinforcing plate; 300. Conical section; 310. Rounded corner plate; 320. Triangular plate; 330. Square top frame; 340. Pull ring plate; 350. Conical pull ring; 360. Expansion joint; 400. Coal hopper beam; 500. Embedded parts; 510. Guide groove; 600. Detachable movable lifting lug; 610. Movable lifting lug; 620. Pin; 630. Locking component; 700. Tensioning fixture; 710. Mounting plate; 711. Dovetail groove; 720. Rotating body; 721. Rotating body body; 722. Driven ring; 723. Driving ring; 730. Connecting rod; 731. Connecting crossbar; 732. Connecting guide rod; 733. First connecting ring; 734. Second connecting ring; 740. Connecting wire rope; 750. Positioning ring; 800, manual hoist; 900. Steel wire rope. Detailed Implementation

[0032] The following combination Figures 1 to 6 This application will be described in further detail.

[0033] refer to Figure 1 This embodiment provides a method for installing a steel coal hopper, the method comprising: S1: Segmented prefabrication: The steel coal hopper is prefabricated in three segments. A 100mm expansion joint of 360° is reserved at the four corners of the upper opening of the cone, and a 350° cone pull ring is welded on.

[0034] S2: Lower section hoisting: A reinforcing plate 250 with elongated holes is welded to the upper part of the lower section 200 wall panel, and movable lifting lugs 610 are inserted through it. A crane lifts the lower section 200 onto the coal bucket beam 400, positioning and welding the 20 support points on the lower section 200 to the embedded parts 500 on the coal bucket beam 400. Personnel remove the movable lifting lugs 610 via a steel ladder.

[0035] S3: Cone Installation: To prevent interference with the installation of the steel coal hopper cone, the lifting lugs are located inside the cone's wall panel. Traditional welded lifting lugs are used. A horizontal safety net is installed inside the steel coal hopper cone to protect personnel welding the cone to the lower section of the bucket body. The crane lifts the cone to 200mm above the lower section of the bucket body and slowly lowers it into the bucket body. If it gets stuck, use a hand-operated hoist to tighten the 800mm hook and pull ring. The upper opening of the cone should then be retracted inwards by about 10-20mm to allow it to pass through.

[0036] S4: Temporary welding of the cone to the lower section of the bucket body: After the steel coal bucket cone is passed through, with the crane not unhooked, use a chain hoist to finely adjust and align it, and use 4 stiffening plates to temporarily weld the upper opening of the cone to the lower opening of the bucket body.

[0037] S5: Hoisting of the upper section of the bucket: The lifting lugs of the upper section 100 of the steel coal bucket are set on the top of the steel coal bucket cover. Before hoisting, the positioning of the coal dropping channel on the top cover of the coal bucket should be determined in advance, and it should correspond to the holes of the conveyor belt. Hoist the upper section 100 of the bucket, including the top cover, directly above the lower section 200 of the bucket body, and weld the circumferential seam.

[0038] S6: Finishing: Weld the conical expansion joint and all circumferential joints, and perform 100% ultrasonic testing according to the secondary weld standard. Example

[0039] S1: The coal hopper is divided into the upper part of the hopper body 100, the lower part of the hopper body 200, and the conical section 300; the four corners of the upper opening of the conical section 300 are reserved with deformation joints 360 and conical pull rings 350.

[0040] refer to Figure 2 The coal hopper is divided into three sections: the upper section of the hopper body (100mm), the lower section of the hopper body (200mm), and the cone section (300mm).

[0041] refer to Figure 3 The upper part 100 of the bucket body includes an upper bucket body 110, a top cover 120 and a plurality of upper lifting lugs 130. The top cover 120 is installed on the upper bucket body 110 and the upper lifting lugs 130 are installed on the upper bucket body 110.

[0042] refer to Figure 3 and 4The lower section 200 of the bucket body includes a lower bucket body 210, a plurality of support rods 220, a number of guide blocks 230 equal to the number of support rods 220, and a plurality of reinforcing plates 250. The support rods 220 are evenly installed on the outer wall of the lower bucket body 210. The guide blocks 230 are installed at the lower ends of the support rods 220, and their corners are rounded. The reinforcing plates 250 can be installed on the inner wall of the lower bucket body 210 or on the outer wall of the lower bucket body 210. When the reinforcing plates 250 are installed on the inner wall of the lower bucket body 210, they need to be removed when hoisting the conical section 300. The reinforcing plates 250 are provided with waist-shaped holes 240.

[0043] refer to Figure 3 and 5 The conical segment 300 includes four rounded corner plates 310, four triangular plates 320, a square top frame 330, four pull ring plates 340, and several conical pull rings 350. The bottom of the conical segment 300 is circular, and the top is square. The rounded corner plates 310 are installed on the waist of the triangular plates 320, and the square top frame 330 is installed on the bottom edge of the triangular plates 320. Expansion joints 310 are respectively opened at the four corners of the square top frame 330. The pull ring plates 340 are installed on the square top frame 330, and the conical pull rings 350 are installed on the pull ring plates 340.

[0044] Traditional square-to-round coal hoppers have right-angled joints at the four corners, creating dead angles where coal dust and wet coal easily accumulate, arch, and stick to the walls, leading to frequent blockages. The conical section 300 replaces right-angle welds with independent rounded corner plates 310, ensuring smooth, curved transitions at all four corners, eliminating sharp angles and dead angles. This allows for smooth coal descent, preventing coal accumulation, sticking, and blockages at the structural source, significantly reducing cleaning and maintenance workload. The transition from square to round is a high-stress concentration area. Traditional straight-plate right-angle structures suffer from concentrated welds and stress, making them prone to bulging and weld cracking under long-term coal impact. In the conical section 300, four triangular plates 320 and four rounded corner plates 310 alternately close. The triangular plates 320 utilize the stable force-bearing characteristics of triangles, while the rounded corner plates 310 form a continuous arc-shaped reinforcement structure, evenly distributing structural stress at the transition point, improving overall rigidity and vibration resistance, and effectively preventing deformation and weld cracking under long-term loads. The rounded corner plate 310 and the triangular plate 320 are neatly spliced ​​together, with a smooth and continuous transition, without any uneven steps. The coal flow is stable, with no turbulence or local eddy dust accumulation, effectively reducing dust and coal powder disturbance during the coal falling process and improving on-site environmental protection conditions.

[0045] The upper 100mm section, lower 200mm section, and conical section 300mm are all spliced ​​steel plates using butt welds. Before aligning the steel plates, the spliced ​​steel plates must be ground and cleaned to remove surface oil, welding spatter, and other debris. During alignment, the flatness of the steel plates must be ensured to avoid misalignment. The weld grade is Class II. It is recommended to install arc-starting plates at both ends of the butt welds, with a slit shape identical to the main material. These arc-starting plates should be removed after welding. The inner surface of the splice joint should be smooth, all slit welds should be fully penetrated, and the horizontal welds should be ground smooth to prevent coal accumulation.

[0046] S2: Lower section hoisting: Insert the detachable movable lifting lug 600, and the crane lifts the lower section 200 of the bucket body onto the coal bucket beam 400, so that the 20 support rods 220 are positioned and welded to the embedded parts 500 on the coal bucket beam 400. Personnel remove the detachable movable lifting lug 600 via a steel ladder.

[0047] refer to Figure 4 The detachable movable lifting lug 600 includes a movable lifting lug 610, a pin 620, and a locking member 630. The lower section 200 of the bucket body has several waist-shaped holes 240. The pin 620 passes through the waist-shaped holes 240 and is locked to the movable lifting lug 610 by the locking member 630.

[0048] The locking component 630 can be a bolt, a clip, a lock, etc., and in this embodiment, a bolt is preferred.

[0049] refer to Figure 4 When using the detachable movable lifting lug 600, remove the locking piece 630, remove the pin 620 from the movable lifting lug 610, align the movable lifting lug 610 with the oblong hole 240, pass the pin 620 through the oblong hole 240 and the movable lifting lug 610, and use the locking piece 630 to fix the pin 620 and the movable lifting lug 610. This achieves quick and reliable connection and separation between the lifting lug and the lower section 200 of the bucket body. The oblong hole 240 provides the necessary adjustment margin to accommodate minor alignment deviations. The detachable design avoids the subsequent gas cutting and grinding process required for traditional welded lifting lug fixing, which not only protects the integrity of the base material and improves construction efficiency, but also eliminates the safety hazards of high-altitude cutting operations and allows the lifting lug to be reused, saving construction costs.

[0050] refer to Figure 2 The embedded part 500 is provided with a guide groove 510, and the guide block 230 is inserted into the guide groove 510. During the hoisting and positioning of the lower section 200 of the bucket body, each guide block 230 can be aligned and placed into the corresponding guide groove 510, thereby achieving the initial positioning and guidance of the lower section 200 of the bucket body, ensuring that it can be quickly and accurately aligned during installation, and improving the installation efficiency and the accuracy of structural connection.

[0051] The support rod 220 is positioned and welded to the embedded part 500. This effectively transfers the load of the lower section 200 of the bucket body to the embedded part 500 in the coal bucket beam 400 through the support rod 220, thereby distributing it throughout the main structure. This enhances the stability and load-bearing capacity of the overall structure. At the same time, the on-site welding method facilitates construction adjustments and helps ensure installation accuracy and connection strength.

[0052] To ensure uniform force transmission, the elevation of each embedded part 500 must be strictly leveled before installing the steel coal hopper. The design considers that the relative vertical deformation difference between any two embedded parts 500 on the beam after the coal hopper is filled with coal should not exceed 5mm. Therefore, the leveling of the elevation of each embedded part 500 on the coal hopper beam 400 should be strictly controlled before the installation of the steel coal hopper, and the error should be strictly controlled during the casting of the reinforced concrete components.

[0053] S3 Cone Installation: To prevent interference with the installation of cone section 300, lifting lugs are installed inside the cone section 300 wall panel. Traditional welded lifting lugs are used. A horizontal safety net is installed inside cone section 300 to protect personnel welding the cone to the lower section of the bucket body. The crane lifts cone section 300 above the lower section of the bucket body and slowly lowers it into the lower section 200. If jamming occurs, use a hand-operated hoist to hook and tighten the cone pull ring 350. The upper opening of cone section 300 will then retract inward by approximately 10-20mm to allow passage.

[0054] During the downward insertion of the conical section 300 into the lower section 200 of the bucket body, if the outer edge of the square top frame 330 is slightly too large due to installation errors or structural interference, preventing it from passing smoothly through the lower section, multiple manual hoists 800 can be used for adjustment. Specifically, the hooks at both ends of each manual hoist 800 are hooked onto the conical pull rings 350 on two opposing pull ring plates 340, forming a symmetrical force distribution. Then, these manual hoists 800 are operated synchronously to gradually tighten the chain, applying a horizontal inward pulling force to the square top frame 330 through the pull ring plates 340. Under this tightening force, the square top frame 330 undergoes controllable elastic deformation, with its four corners slightly contracting inward. This reduces the width of the originally reserved deformation joint 310, and the outer contour of the entire upper opening of the conical section 300 shrinks by approximately 10-20 mm. This temporary dimensional adjustment is sufficient to allow it to pass smoothly through the constrained space of the lower section 200 of the bucket body. After the conical section 300 is installed in place, slowly release and remove all manual hoists 800. The square top frame 330 will automatically return to its original shape and size due to the elasticity of the material. Finally, after confirming that the position is accurate, the expansion joint 310 can be welded and fixed, thus completing the installation of this section. This facilitates the installation of the conical section 300.

[0055] S4: Temporary welding of the cone section and the lower section of the bucket body: After the cone section 300 is passed through, with the crane not unhooked, use a chain hoist to finely adjust and align it, and use 4 stiffening plates to temporarily weld the upper opening of the cone section 300 to the lower opening of the lower section 200 of the bucket body.

[0056] S5: Hoisting of the upper section of the bucket: Before hoisting, determine the location of the coal dropping channel on the top cover 120 of the coal bucket, and align it with the holes of the conveyor belt. Hoist the upper section 100 of the bucket to directly above the lower section 200 of the bucket and weld the circumferential seam.

[0057] The intersecting parts are full penetration butt welds, and the weld quality must be strictly guaranteed. There should be specific guarantee measures for high-altitude welding on site. Weld inspection should be 100% ultrasonic monitoring in addition to ordinary monitoring. If the defects cannot be judged, radiographic testing must be used to assist in the judgment.

[0058] S6: Finishing: Weld the expansion joints 360° and all circumferential joints, and perform 100% ultrasonic testing according to the secondary weld standard. Example

[0059] The difference from Embodiment 1 is that in S4, the conical pull ring 350 is tightened using a tensioning fixture 700.

[0060] refer to Figure 5 and 6 The tensioning fixture 700 includes a mounting plate 710, a rotating body 720, four connecting rods 730, four connecting wire ropes 740, and a positioning ring 750. The mounting plate 710 has four dovetail grooves 711. The connecting rods 730 are slidably disposed in the dovetail grooves 711. One end of the connecting wire rope 740 is connected to the connecting rod 730, and the other end is connected to the rotating body 720. The rotating body 720 is bearing-connected to the mounting plate 710. The positioning ring 750 is mounted on the mounting plate 710. One hook of the manual hoist 800 is hooked on the rotating body 720, and the other hook is hooked on the positioning ring 750.

[0061] refer to Figure 6 The rotating body 720 includes a rotating body body 721, four driven rings 722 and a driving ring 723. The rotating body body 721 is bearing-connected to the center of the mounting plate 710. The driven rings 722 are evenly installed on the rotating body body 721 along the circumferential direction. The driving ring 723 is installed on the rotating body body 721. One hook of the manual hoist 800 is hooked on the driving ring 723. One end of the connecting wire rope 740 is connected to the driven ring 722.

[0062] refer to Figure 6The connecting rod 730 includes a connecting crossbar 731, a connecting guide rod 732, a plurality of first connecting rings 733 and second connecting rings 734. The connecting guide rod 732 is slidably disposed in the dovetail groove 711. The connecting crossbar 731 is installed at one end of the connecting guide rod 732. The first connecting rings 733 are installed on the connecting crossbar 731. The second connecting rings 734 are installed at the other end of the connecting guide rod 732. The other end of the connecting wire rope 740 is connected to the second connecting ring 734.

[0063] refer to Figure 6 The centers of the circular holes on the first connecting ring 733, the second connecting ring 734, the driven ring 722, the driving ring 723, and the positioning ring 750 are all in the same horizontal plane.

[0064] In use, each conical pull ring 350 on the connecting pull ring plate 340 is connected to the first connecting ring 733 via a steel wire rope 900, with the steel wire ropes 900 on the same pull ring plate 340 kept horizontal. Tightening the manual hoist 800 causes the driving ring 723 to move, which in turn causes the rotating body 721 to rotate. The rotating body 721 then causes the driven ring 722 to move, which in turn causes the steel wire rope 740 to move. The steel wire rope 740 pulls the second connecting ring 734, which in turn causes the connecting guide rod 732 to move along the dovetail groove 711. The guide rod 732 then causes the connecting crossbar 731 and the first connecting ring 733 to move. The first connecting ring 733 drives the steel wire rope 900 to move, and the steel wire rope 900 pulls the conical pull ring 350. This pulling force is applied evenly to the side of the square top frame 330 through the pull ring plate 340. When the square top frame 330 is tightened, the center of the circular hole of the conical pull ring 350 is close to the center of the circular hole of the first connecting ring 733, which ensures the balance of force during the tightening operation, reduces the structural tilting or twisting, and achieves stable and controllable tightening and fixing of the entire frame structure.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for installing a steel coal hopper, characterized in that, include: Prefabricated coal hopper in sections: The coal hopper is divided into the upper part of the hopper body (100), the lower part of the hopper body (200), and the cone section (300). Lower section hoisting: The lower section (200) of the bucket body is hoisted onto the coal bucket beam (400); Cone section installation: Hoist the cone section (300) and pass it through the lower section (200) of the bucket body; Hoisting of the upper part of the bucket body: Hoist the upper part of the bucket body (100) onto the lower part of the bucket body (200), and weld the upper part of the bucket body (100) to the lower part of the bucket body (200). Finishing: Weld the upper end of the cone section (300) to the lower end of the bucket body section (200).

2. The installation method of the steel coal hopper according to claim 1, characterized in that: The lower section (200) of the bucket body includes several support rods (220). The coal bucket beam (400) has a number of embedded parts (500) that are the same as the number of support rods (220). The support rods (220) abut against the embedded parts (500) and are fixedly connected by welding.

3. The installation method of the steel coal hopper according to claim 2, characterized in that: The lower section (200) of the bucket body also includes guide blocks (230) in the same number as the support rods (220). The guide blocks (230) are disposed on the support rods (220). The embedded part (500) has a guide groove (510). The guide blocks (230) are inserted into the guide groove (510).

4. The installation method of the steel coal hopper according to claim 1, characterized in that: When hoisting the lower section of the bucket body, several detachable movable lifting lugs (600) are used. The detachable movable lifting lugs (600) include movable lifting lugs (610), pins (620) and locking parts (630). The lower section of the bucket body (200) is provided with several waist-shaped holes (240). The pins (620) are inserted into the waist-shaped holes (240) and locked to the movable lifting lugs (610) by the locking parts (630).

5. The method for installing a steel coal hopper according to any one of claims 1 to 4, characterized in that: The conical segment (300) includes four rounded corner plates (310), four triangular plates (320), and a square top frame (330). The rounded corner plates (310) are located on the waist of the triangular plates (320), and the square top frame (330) is located on the bottom edge of the triangular plates (320). The bottom of the conical segment (300) is circular, and the top part is square.

6. The installation method of the steel coal hopper according to claim 5, characterized in that: The square top frame (330) has expansion joints (360) at its four corners.

7. The method for installing a steel coal hopper according to claim 5, characterized in that: The conical section (300) also includes four pull ring plates (340) and several conical pull rings (350), the pull ring plates (340) are disposed on the square top frame (330), and the conical pull rings (350) are disposed on the pull ring plates (340).

8. The method for installing a steel coal hopper according to claim 7, characterized in that: The conical pull ring (350) is tightened using a tensioning fixture (700), which includes a mounting plate (710) and a rotating body (720). The rotating body (720) is rotatably mounted on the mounting plate (710). One hook of the manual hoist (800) is hooked on the rotating body (720), and the other hook is hooked on the mounting plate (710).

9. The method for installing a steel coal hopper according to claim 8, characterized in that: The tensioning fixture (700) also includes four connecting rods (730) and four connecting wire ropes (740). The connecting rods (730) are slidably mounted on the mounting plate (710). One end of the connecting wire rope (740) is connected to the connecting rod (730), and the other end is connected to the rotating body (720).

10. The method for installing a steel coal hopper according to claim 1, characterized in that: It also includes temporary welding of the cone section to the lower section of the bucket body. After the cone section (300) passes through the lower section of the bucket body (200), the upper opening of the cone section (300) is temporarily welded to the lower opening of the lower section of the bucket body (200) with several stiffening plates while the hoisting equipment is not unhooked.

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