A boiler top crane mounting structure

Abstract

The utility model relates to a mounting structure of boiler furnace top equipment, specifically a boiler furnace top hoist mounting structure for installing hoist bed frame on boiler furnace top large plate beam, and is suitable for hoist mounting of boiler furnace hearth overhaul lifting platform of thermal power plant. A boiler furnace top hoist mounting structure is used for installing hoist bed frame on boiler furnace top large plate beam, and comprises: first connecting part fixedly arranged on the large plate beam, second connecting part fixedly arranged on the bed frame, and hinged shaft, wherein one of the first connecting part and the second connecting part is ear fork seat, and the other is ear fork head matched with the ear fork seat, the ear fork seat is equipped with first pin hole, the ear fork head is equipped with second pin hole, and the hinged shaft is inserted into the first pin hole and the second pin hole after alignment to realize detachable connection of the bed frame and the large plate beam.

Description

Technical Field

[0001] This utility model relates to the installation structure of boiler top equipment, specifically a boiler top hoist installation structure, used to install the hoist base frame on the boiler top large plate beam, and is suitable for the hoist installation of the boiler furnace maintenance lifting platform in thermal power plants. Background Technology

[0002] In the installation of boiler top hoists in thermal power plants, the traditional method involves directly welding the hoist's base frame to the platform of the boiler top girder. This welding process has the following problems: 1. Complex process: It requires multiple steps such as preparation, assembly, spot welding, correction, full welding, cleaning, and inspection. It has stringent requirements for the on-site environment (windproof, rainproof, and fireproof). Moreover, the boiler top is a high-temperature, flammable, explosive, and confined space for operation, which is extremely risky. 2. High cost and long cycle: It requires the cooperation of certified welders and high-altitude workers, making it difficult to allocate human resources. Welding operations cannot be carried out in parallel, and construction can only continue after non-destructive testing is passed, extending the overall construction period by about 3 times. 3. Welding deformation is difficult to control: Local heating and cooling processes are prone to generating thermal stress and thermal deformation, which leads to loss of tolerance in the base structure and affects the assembly accuracy and operating performance of the equipment; 4. Difficult to maintain: When replacing or modifying equipment, the welded parts need to be destructively removed, which damages the base material and increases maintenance costs.

[0003] To address the aforementioned problems, this utility model proposes a hinged shaft installation structure that replaces extensive welding work on-site with pin connections, enabling fast, precise, and repeatable installation. Utility Model Content

[0004] The purpose of this utility model is to provide a boiler top hoist installation structure that enables the detachable installation of the machine base frame and the large plate beam through a hinge shaft, connecting the lug seat and the lug head, thus overcoming the defects of the welding process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A boiler top hoist installation structure, used to install the hoist base frame onto the boiler top large plate beam, includes: A first connecting part fixedly installed on the large plate beam; A second connecting part fixedly mounted on the machine base frame; And the hinge shaft; The first connecting part and the second connecting part are, respectively, an ear fork seat and an ear fork head that cooperates with the ear fork seat. The ear fork seat is provided with a first pin hole and the ear fork head is provided with a second pin hole. By inserting the hinge shaft into the aligned first pin hole and second pin hole, the machine base frame and the large plate beam are detachably connected.

[0006] Furthermore, the ear fork seat includes an ear fork seat floor and two first ear plates symmetrically arranged on the ear fork seat floor; the ear fork head includes at least one second ear plate; the second ear plate of the ear fork head can be inserted between the two first ear plates.

[0007] Furthermore, the ear fork head is constructed using a single second ear plate, and the thickness of the second ear plate is 1-3 times that of the first ear plate.

[0008] Furthermore, the ear fork head uses two second ear plates to form a two-piece structure.

[0009] Furthermore, the ear fork head is an independent ear fork head assembly, which includes an ear fork head support base plate, an ear fork head support body standing on the ear fork head support base plate, and a second ear plate disposed on the ear fork head support body.

[0010] Furthermore, the ear fork head support is a square or rectangular tubular profile.

[0011] Furthermore, the ear fork seat is fixed to the large plate beam, the ear fork head is fixed to the bottom of the machine base frame, and the ear fork head and ear fork seat are inserted into each other vertically.

[0012] Furthermore, the ear fork seat is fixed to the large plate beam, the ear fork head is fixed to the side of the machine base frame, and the ear fork head and ear fork seat are inserted horizontally.

[0013] Furthermore, the hinge shaft is a single-headed pin or a double-headed pin, with a locking pin hole at its end and a locking pin inserted into the locking pin hole.

[0014] Furthermore, multiple sets of ear fork seats and ear fork heads are provided and are symmetrically arranged along the front and rear direction of the machine base frame.

[0015] Compared with the prior art, this application has at least the following technical effects: 1. Saves installation time and speeds up project progress: Large-area on-site welding is a complex process requiring multiple steps such as preparation, assembly, spot welding, alignment, full welding, cleaning, and inspection. However, the pin connection in this application only requires welding a few mounting lugs on-site, simplifying the process and reducing the amount of on-site welding work. This reduces welding work from several days to just a few hours, significantly shortening the on-site installation and commissioning cycle of the equipment.

[0016] 2. Reduced welder count and lower construction costs: A welding team typically requires multiple members (welders, riveters, and assistants) to work together. However, this application uses a pin-shaft connection, eliminating the need for on-site material handling and welding auxiliary materials. This can usually be easily completed by 1-2 people, directly reducing the number of skilled technicians and the total number of personnel required on-site, thus lowering labor costs and management complexity. It also alleviates the pressure of a shortage of skilled welders. Furthermore, the pin-shaft structure reduces reliance on these welders, allowing equipment installation companies to concentrate their limited pool of skilled welders on unavoidable core component welding processes, achieving optimal resource allocation.

[0017] 3. Ensure structural accuracy and avoid welding deformation: Welding is a process of localized heating and cooling, inevitably generating thermal stress and deformation. This deformation can lead to uncontrolled deformation of the welded hoist base tolerances, directly affecting the final assembly accuracy and operational performance of the equipment. This application uses welding fixtures to position the mounting lugs to be welded during the welding process, minimizing thermal deformation and keeping it within a reasonable range to ensure factory-grade accuracy is equivalent to on-site accuracy. During factory manufacturing, the pin holes are machined using high-precision CNC machine tools, ensuring perfect concentricity. During on-site installation, simply inserting the pins allows for 100% replication of the optimal state achieved during factory testing, ensuring the alignment and accuracy of the hoist's motor, winch, and drum components. This avoids additional stress on the boiler top hoist caused by deformation of the welded hoist base, ensuring precise assembly for even load distribution, reducing vibration, noise, and abnormal wear during operation, thereby significantly improving the equipment's reliability, stability, and service life.

[0018] 4. Extended equipment lifespan and easier replacement: After a period of operation, if the equipment needs to be replaced or upgraded, welding connections can only be removed by gas cutting or other destructive methods. This application uses a pin connection, which allows for easy separation of components simply by pulling out the pin. This facilitates future equipment maintenance and upgrades, reduces the overall equipment maintenance cost throughout its lifecycle, and avoids construction sites that involve large workloads and damage to the base material. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram of the installation structure of this utility model; Figure 2 for Figure 1 The front view at point A in the middle; Figure 3 This is another overall schematic diagram of the installation structure of this utility model; Figure 4 for Figure 3 The main view at point C; Figure 5 This is another overall structural diagram of the installation structure of this utility model; Figure 6 for Figure 5 The front view at point B; Figure 7 This is a schematic diagram of the ear fork head structure; Figure 8 This is a schematic diagram of the ear fork seat structure; Figure 9 A schematic diagram of an independent ear fork head structure; Figure 10 This is a schematic diagram of the assembly of the ear fork head and the square profile base frame; Figure 11 This is a schematic diagram of the assembly of the ear fork head and the airfoil base frame; Figure 12 This is a schematic diagram of the assembly of the independent ear fork head and the square profile base frame; Figure 13 This is a schematic diagram of the assembly of the independent lug head and the airfoil base frame; Figure 14 This is a schematic diagram of the assembly of the lug head located on the outside of the base frame with the airfoil base frame; Figure 15 This is a schematic diagram of the assembly of the ear fork head located on the outside of the machine base frame with the square profile base frame; In the diagram: 1. Airframe, 11. Airfoil base frame, 111. Reinforcing rib plate, 12. Square profile base frame; 2. Ear fork seat, 201. First ear plate, 2011. Ear fork seat pin hole, 202. Ear fork seat rib plate, 203. Ear fork seat floor; 3. Ear fork head, 301. Second ear plate, 3011. Ear fork head pin hole, 3012. Ear fork head slot, 3013. Ear fork head neck, 31. Independent ear fork head, 302. Ear fork head support body, 303. Ear fork head support base plate; 4. Hinge shaft, 41. Single-headed pin, 42. Double-headed pin, 401. Locking pin. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0021] like Figure 1-4 As shown in Figures 7-8, this installation structure includes a base frame 1, a fork seat 2, a fork head 3, and a hinge shaft 4. The fork seat 2 is welded to the boiler's main beam, and the fork head 3 is fixed to the bottom of the base frame 1. The fork seat 2 includes a fork seat floor 203, two symmetrically welded first ear plates 201, and an outer fork seat stiffener 202; the fork head 3 can be a single second ear plate 301 or a double second ear plate 301; the thickness of the second ear plate 301 in a single-piece fork head 3 structure should be slightly greater than the thickness of the first ear plate 201, preferably close to 1-3 times the thickness of the first ear plate 201. Figure 1 , 2As shown, during installation, insert the ear fork head 3 between the two first ear plates 201 of the ear fork seat 2, align the pin hole and insert the hinge shaft 4 (such as double-headed pin 42), and fix it with the locking pin 401; the locking pin 401 can be a cotter pin or an R-type pin.

[0022] like Figure 7 , 10 As shown in -11 and 14-15, the base frame 1 is divided into various types such as airfoil base frame 11 and square base frame 12, depending on the selection of main limb materials. The second ear plate 301 needs to be machined with the opening shape of the ear fork head groove 3012 to match the different specifications and models of the main limb materials of the base frame 1. The second ear plate 301 has ear fork head pin holes 3011. The length of the front and rear ear fork head groove necks 3013 should not be too short, and the length of the weld should meet the requirements of welding strength. Example

[0023] For the airfoil base frame 11, such as Figure 11 As shown, a reinforcing rib plate 111 needs to be installed at the welding position of the ear fork head 3 to increase the welding contact surface. The thickness of the reinforcing rib plate 111 shall not be less than the thickness of the airfoil base 11, the width shall not be less than the height of the airfoil base 11, and the length shall be calculated and determined according to the height of the airfoil base 11. Example

[0024] like Figure 5-6 As shown in 9, 12-13, the ear fork head 3 can be designed as an independent ear fork head 31 in the form of a component, including an ear fork head support base plate 303, an ear fork head support body 302, and a second ear plate 301. The independent ear fork head 31 is welded to the bottom of the main limb of the base frame 1 and is inserted into the ear fork seat 2 in an upright alignment, which is suitable for base frames of various profiles. Example

[0025] like Figure 3 , 4 As shown in Figures 14 and 15, the ear fork head 3 can be mounted on the side of the base frame 1 and horizontally inserted into the ear fork seat 2 welded to the large plate beam. This method is suitable for installation scenarios with limited space and height. After insertion, it is fixed by the hinge shaft 4.

[0026] Installation steps 1. Calculate the specifications and quantity (usually no less than 4 sets) of the ear fork seat 2, ear fork head 3 and hinge shaft 4 based on the rated load of the hoist. 2. When manufacturing the machine base frame 1 in the factory, the ear fork head 3 is welded to the bottom or side of the machine base frame 1; 3. On site, the ear fork seat 2 is temporarily connected to the ear fork head 3 on the machine base frame 1 through the hinge shaft 4, and the machine base frame 1 is used as the tooling for welding the ear fork seat 2; 4. Adjust the position of the machine base frame 1 so that its center line is aligned with the design drawing, and then level the lug seat 2 after calibrating with a level. 5. Weld and fix the ear fork seat 2 to the large plate beam, and remove the hinge shaft 4 and the machine base frame 1 after cooling; 6. The hoisting and lifting mechanism assembly is installed so that the ear fork head 3 of the base frame 1 is aligned and inserted with the ear fork seat 2, and the hinge shaft 4 is inserted and locked.

[0027] This utility model achieves rapid installation, precise alignment, and convenient disassembly of the hoist through standardized hinge shaft connection, significantly improving construction efficiency and equipment reliability.

Claims

1. A boiler top hoist installation structure for mounting the hoist base frame onto the boiler top beam, characterized in that, include: A first connecting part fixedly installed on the large plate beam; A second connecting part fixedly mounted on the machine base frame; And the hinge shaft; The first connecting part and the second connecting part are, respectively, an ear fork seat and an ear fork head that cooperates with the ear fork seat. The ear fork seat is provided with a first pin hole and the ear fork head is provided with a second pin hole. By inserting the hinge shaft into the aligned first pin hole and second pin hole, the machine base frame and the large plate beam are detachably connected.

2. The boiler top hoist installation structure according to claim 1, characterized in that, The ear fork seat includes an ear fork seat floor and two first ear plates symmetrically arranged on the ear fork seat floor; the ear fork head includes at least one second ear plate; the second ear plate of the ear fork head can be inserted between the two first ear plates.

3. The boiler top hoist installation structure according to claim 2, characterized in that, The ear fork head uses a single second ear plate as a structure, and the thickness of the second ear plate is 1-3 times that of the first ear plate.

4. The boiler top hoist installation structure according to claim 2, characterized in that, The ear fork head uses two second ear plates to form a two-piece structure.

5. The boiler top hoist installation structure according to claim 2, characterized in that, The ear fork head is an independent ear fork head assembly, which includes an ear fork head support base plate, an ear fork head support body standing on the ear fork head support base plate, and a second ear plate disposed on the ear fork head support body.

6. The boiler top hoist installation structure according to claim 5, characterized in that, The ear fork head support is a square or rectangular tubular profile.

7. The boiler top hoist installation structure according to claim 1, characterized in that, The ear fork seat is fixed to the large plate beam, and the ear fork head is fixed to the bottom of the machine base frame. The ear fork head and the ear fork seat are inserted into each other vertically.

8. The boiler top hoist installation structure according to claim 1, characterized in that, The ear fork seat is fixed to the large plate beam, and the ear fork head is fixed to the side of the machine base frame. The ear fork head and the ear fork seat are inserted horizontally.

9. The boiler top hoist installation structure according to claim 1, characterized in that, The hinge shaft is a single-headed pin or a double-headed pin, with a locking pin hole at its end and a locking pin inserted into the locking pin hole.

10. The boiler top hoist installation structure according to claim 1, characterized in that, Multiple sets of ear fork seats and ear fork heads are provided and are symmetrically arranged along the front and rear direction of the machine base frame.

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