Equipment collection box hoisting method

Abstract

The present invention discloses a method for hoisting an equipment collection box, comprising: step one: providing a first collection box and a hoisting tunnel; wherein the height of the first collection box is greater than the length; step two: laying the first collection box down and placing it flat on the initial position, and then hoisting the first collection box horizontally to the front end thereof into the entrance of the hoisting tunnel; step three: tilting the front end of the first collection box downward by vertical rotation until it rests on a translation mechanism provided at the entrance; step four: using the front end of the first collection box as a fulcrum, rotating the rear end of the first collection box forward and entering the hoisting tunnel until the first collection box stands upright on the translation mechanism; step five: rotating the first collection box horizontally 90 degrees on the translation mechanism and then dropping it so that the splicing surface of the first collection box faces the entrance of the hoisting tunnel. The present invention can utilize the short time of equipment maintenance to deliver large equipment collection boxes into a factory building, move them horizontally into place, and complete the installation in a confined space environment.

Description

Technical Field

[0001] The present invention relates to the technical field of building installation, and in particular to a hoisting method for a large equipment collection box under the conditions of a narrow construction space and a complex construction environment. Background Art

[0002] The sintering ultra-low emission boiler is a new product used in sintering machines that was created to meet the requirements of the "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Steel Industry" issued by the Ministry of Ecology and Environment in April 2019. It is a renovation project for the main exhaust pipe of an existing sintering machine.

[0003] Taking the third sintering unit of Baosteel Iron and Steel Plant as an example, which was built in 2016, the main pollutant emission indicators are: NOx emission concentration in flue gas: ≤110mg / Nm 3 ;Dust emission concentration: ≤20mg / Nm 3 , cannot meet the new emission standards.

[0004] A waste heat boiler was added to the high-temperature section of the sintering flue to cool the flue gas, reducing the flue temperature before the main exhaust fan from the current 150°C to around 126°C (lowering the temperature further would increase the possibility of corrosion in the subsequent flue and electrostatic precipitator). The flue gas temperature after the main exhaust fan was reduced from the current 170°C to around 146°C. The deaerator in the flue boiler on the flue from the mixer to the booster fan cools the flue gas from around 146°C to around 142°C. The flue gas then passes through a heat pipe heat exchanger, ultimately cooling it to around 138°C, meeting ultra-low emission requirements.

[0005] This boiler is a modification of online production equipment. It is a direct-connected boiler on the main exhaust pipe of the sintering machine. The existing platform and cable tray outside the factory building cannot be changed. One side is affected by the pipeline and the components cannot directly enter the factory building. The factory building is affected by facilities such as cable trays, air ducts, and slide pipes, resulting in a poor construction environment. It is installed between the 7m platform and the 15.3m platform, with a small construction space. The boiler header is installed during the sintering maintenance period, and the construction time is tight and the difficulty is great.

[0006] The main header of a sintered ultra-low emission boiler is large in size (the maximum half-header size is 6900×3400×1440mm), resulting in a narrow construction space and a complex construction environment. Currently, there is no relevant reference experience for this technology. Summary of the Invention

[0007] In view of the above problems, the present invention discloses a method for hoisting an equipment header, comprising the following steps:

[0008] Step 1: Provide a first header and a hoisting tunnel; wherein the height of the first header is greater than its length;

[0009] Step 2: Lay down the first header and place it flat at its initial position, then hoist the first header horizontally to the front end so that it enters the entrance of the hoisting tunnel;

[0010] Step 3: by vertically rotating, tilt the front end of the first header downward until it rests on the translation mechanism provided at the inlet;

[0011] Step 4: Using the front end of the first header as a fulcrum, rotate the rear end of the first header forward and move it into the hoisting tunnel until the first header stands upright on the translation mechanism;

[0012] Step 5: Rotate the first header horizontally 90 degrees on the translation mechanism and then drop it so that the splicing surface of the first header faces the entrance of the hoisting tunnel.

[0013] The above-mentioned equipment collection box lifting method, wherein, a first lifting lug is provided at the center position of the left and right sides of the first collection box, the first lifting lug is connected to the lifting device of a lifting machinery, and a rotational fit is formed, and at the same time, a second lifting lug is provided at the front end position of the first collection box, and the second lifting lug is connected to the lifting device through a lifting mechanism; wherein in step three, the distance between the front end and the lifting device is adjusted by operating the lifting mechanism, so that the first collection box rotates vertically with the first lifting lug as the rotation fulcrum; in step four, the lifting machinery is operated to extend the lifting device into the lifting corridor, driving the rear end of the first collection box to rotate forward and enter the lifting corridor; in step five, the lifting machinery is operated to rotate the lifting device, driving the first collection box to rotate horizontally on the translation mechanism.

[0014] In the above-mentioned equipment collection box lifting method, the first lifting ear includes a capped steel pipe, the first lifting ear and the lifting device are connected by a rope sleeved on the capped steel pipe, and a rotational fit is formed between the capped steel pipe and the rope.

[0015] In the above-mentioned equipment collection box hoisting method, the hoisting mechanism includes a hand hoist or an electric hoist.

[0016] In the above-mentioned equipment collection box lifting method, the lifting machinery includes a crane, the crane is provided with a boom, and the boom is connected to the lifting device through a hook.

[0017] In the above-mentioned equipment collection box hoisting method, the translation mechanism includes parallel tracks laid along the hoisting corridor and a plurality of pulleys arranged thereon.

[0018] The above-mentioned equipment collection box hoisting method further includes: providing a second collection box, and according to steps one to five, horizontally rotating the second collection box on the translation mechanism until the splicing surface faces the splicing surface of the first collection box; then, by manipulating the translation mechanism, the second collection box is brought closer to the first collection box, so that the splicing surface of the second collection box is closed with the splicing surface of the first collection box, and the second collection box and the first collection box are assembled into an integral equipment collection box.

[0019] The above-mentioned equipment collection box hoisting method further includes: transporting the equipment collection box along the hoisting corridor to the installation position by operating the translation mechanism; then, lifting the equipment collection box and removing the translation mechanism to allow the equipment collection box to fall into place at the installation position.

[0020] In the above-mentioned method for hoisting the equipment collection box, the hoisting corridor is formed by temporarily removing part of the obstacles between the installation position and the initial position, and is restored after the equipment collection box is installed in place.

[0021] In the above-mentioned equipment header hoisting method, the equipment header includes a boiler header.

[0022] The above invention has the following advantages or beneficial effects:

[0023] The present invention discloses a method for hoisting equipment manifolds. By moving the equipment manifold horizontally through a confined space (i.e., the space occupied by the hoisting tunnel), erecting the manifold after passage, and then horizontally moving it to the installation location, the method solves the previous problem of being unable to install equipment manifolds in confined spaces. Using the method, large equipment manifolds can be brought into a factory building, horizontally moved into position, and installed in a confined space environment, utilizing the brief time available for equipment maintenance.

[0024] This invention can be applied to ultra-low emission adaptive retrofit projects in the steel industry. With increasing environmental protection requirements, ultra-low emission adaptive retrofit projects for sintering machines, for example, will become increasingly common, demonstrating its significant potential for widespread adoption. The method described in this invention can be used for hoisting ultra-low emission boiler headers or other boiler headers installed within confined spaces, demonstrating its broad market potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention and its features, configurations, and advantages will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings. Like reference numerals indicate like parts throughout the drawings. The drawings are not necessarily drawn to scale, emphasis being placed on illustrating the subject matter of the present invention.

[0026] Figures 1-4 Schematic diagram of the structure of a sling in one embodiment of the present invention;

[0027] Figure 5-Figure 6 This is a schematic diagram of the first lifting ear structure in one embodiment of the present invention;

[0028] Figure 7-Figure 8 This is a schematic diagram of the second lifting ear structure in one embodiment of the present invention;

[0029] Figures 9-11 Schematic diagram of the translation mechanism structure in one embodiment of the present invention;

[0030] Figure 12-17 The figure is a flow chart of a method for hoisting an equipment header in one embodiment of the present invention. DETAILED DESCRIPTION

[0031] The core idea of ​​the present invention is to disclose a method for lifting an equipment collection box, including providing a first collection box and a lifting corridor, wherein the height of the first collection box is greater than the length (width) of the first collection box; laying the first collection box down and placing it flat in the initial position, and then lifting the first collection box horizontally until its front end enters the entrance of the lifting corridor; by vertically rotating, the front end of the first collection box is tilted downward until it is placed on a translation mechanism provided at the entrance; with the front end of the first collection box as a fulcrum, the rear end of the first collection box is rotated forward and enters the lifting corridor until the first collection box stands upright on the translation mechanism; the first collection box is horizontally rotated 90 degrees on the translation mechanism and then falls, so that the splicing surface of the first collection box faces the entrance of the lifting corridor.

[0032] The present invention solves the problem that equipment headers cannot be installed in confined spaces. Using the method of the present invention, large equipment headers can be brought into the factory, moved horizontally into place, and installed in a confined space environment during a short period of equipment maintenance.

[0033] The method and related structures of the present invention are further described below with reference to the accompanying drawings and specific embodiments, but are not intended to limit the present invention.

[0034] Taking the application of the present invention in the adaptive transformation project of the three-sintering ultra-low emission boiler of Baosteel Iron and Steel Plant as an example, in an equipment header hoisting method disclosed in the present invention, the present invention can be implemented according to the following steps.

[0035] The first step is to demolish the wall.

[0036] Before shutting down, remove the wall panels and wall purlins at the locations where they need to be installed, as well as the wall panels and wall purlins between lines 15 and 17 and between 7m and 15.3m.

[0037] The second step is to dismantle the flue and affected areas.

[0038] Remove the air guide pipes, slide pipes and other facilities that affect the placement of the boiler (equipment);

[0039] Remove the main exhaust duct and corresponding ash hopper at the installation location.

[0040] At this point, the lifting corridor is formed.

[0041] The third step is to make the slings and lifting ears.

[0042] Due to the limited transportation conditions of the boiler header (equipment header) (the boiler header in this embodiment has an outer shape of about 6900×6800 mm), the boiler header is divided into two half headers (the first header and the second header) for delivery to the site.

[0043] At the same time, due to the limited space in the factory building, the boiler headers, once assembled outside the factory, could not be brought inside and had to be reassembled inside. Therefore, a specialized lifting device was required. Steel pipe lifting lugs (primary lifting lugs) were installed on the sides of the front and rear half boiler headers to allow the wire ropes connected to the lifting device to rotate. Steel ring lifting lugs (secondary lifting lugs) were installed at the corners of the boiler headers to connect the hoist (lifting mechanism) to the lifting device.

[0044] In a preferred embodiment of the present invention, the sling structure can refer to Figures 1-4 .in, Figure 2 for Figure 1 Middle 1-1 view, Figure 3 for Figure 2 Middle 2-2 view, Figure 4 for Figure 2 Middle 3-3 view.

[0045] In a preferred embodiment of the present invention, the first hanging ear structure can refer to Figure 5-Figure 6 , which is in the form of a capped steel pipe. Figure 6 for Figure 5 Middle 4-4 view.

[0046] In a preferred embodiment of the present invention, the second hanging ear structure can refer to Figure 7-Figure 8 , which is in the form of a steel ring. Figure 8 for Figure 7 Middle 5-5 view

[0047] The fourth step is to make the transport platform and pulley (translation mechanism).

[0048] A transport platform is installed on the existing concrete frame and steel beams of the factory building located in the hoisting tunnel. The transport platform can be composed of two main steel beams (parallel tracks), and two pulleys can be installed on each main steel beam, for a total of four pulleys. The present invention is not limited to this.

[0049] In a preferred embodiment of the present invention, the transport platform and the pulley structure can refer to Figures 9-11 .in, Figure 10 for Figure 9 Middle 6-6 view, Figure 11 for Figure 9 Middle 7-7 view.

[0050] Step 5: Hoisting and assembling the boiler header.

[0051] Due to the limited height of the opening in the factory building, the boiler header could not be hoisted into the factory building as a whole. Therefore, we separated the boiler header into two parts (the first and second headers) for hoisting. They could only be hoisted in a flat position, and then rotated and adjusted on the hooks to place them in the assembly position.

[0052] First, place the front half of the boiler header (the first header) flat on the wooden blocks (initial position) at the temporary lifting site, and weld the steel pipe lifting lugs to the center positions on both sides of the front half of the boiler header. Then, use a steel wire rope to hang it on the designed lifting fixture as the main force point for lifting, and after the steel wire rope is put on the steel pipe lifting lug, it can form relative rotation. Next, use a hoist and a steel wire rope to connect the steel ring lifting lug (the second lifting lug) and the lifting fixture at the lower part of the front half of the boiler header (the front end of the first header) as an auxiliary force point to keep the front half of the boiler header balanced, such as Figure 12 shown.

[0053] When lifting the front half of the boiler header to the wall at the entrance of the plant (the entrance of the hoisting tunnel), use a car hook to send the front half of the boiler header to the wall (the entrance of the hoisting tunnel), and then use the loose gourd to gradually tilt the front half of the boiler header equipment. Figure 13 shown.

[0054] When the front half of the boiler header falls on the transport platform, the crane extends the boom head (front end of the boom) into the factory building, then completely loosens the hoist and extends the crane boom head forward a short distance, and the front half of the boiler header can be fully erected. Figure 14 shown.

[0055] Since there is a 90° deviation between the equipment direction of the front half of the boiler header (i.e. the orientation of the splicing surface at this time) and the installation direction of the equipment, it is necessary to rotate the hook on the truck crane to rotate the front half of the boiler header 90°, and then place the front half of the boiler header on the transport platform. Figure 15 At this time, the right side of the figure is the splicing surface of the front half of the boiler header.

[0056] Next, the rear half of the boiler header (the second header) can be hoisted in the same way as above. After the rear half of the boiler header is also rotated 90° and placed on the transport platform, the splicing surface of the rear half of the boiler header will face the splicing surface of the front half of the boiler header. Then, the rear half of the boiler header and the front half of the boiler header can be moved closer together by manipulating the pulleys located under the rear half of the boiler header and the front half of the boiler header, so that the splicing surfaces of the rear half of the boiler header and the front half of the boiler header are closed. Then, the front half of the boiler header and the rear half of the boiler header can be assembled and welded on the transport platform, so that the rear half of the boiler header and the front half of the boiler header can be reassembled into a complete boiler header, such as Figure 16 shown.

[0057] Step 6: Move horizontally into position.

[0058] After the boiler header is assembled, it is placed on four transport pulleys. A hand winch can be used in conjunction with the transport pulleys below the boiler header to slide the boiler header along the steel beam track to the final installation position. Then, the boiler header is lifted and the pulleys are removed to allow the boiler header to fall to the installation position and be installed in place. Figure 17 shown.

[0059] After installation, the lifting corridor can be removed and the original structure of the factory building can be restored.

[0060] In summary, the present invention easily solves the problem that the boiler header cannot be installed in a confined space in the past by first disassembling the boiler header and then making them pass horizontally through the confined space, then standing the boiler header up to reassemble it, and further moving it horizontally to the installation position. Moreover, the method of the present invention is simple and easy to operate, and the slings used are also particularly easy to use, thus saving a lot of time and improving the installation efficiency of the boiler header. By applying the method of the present invention, the short time of sintering machine maintenance can be utilized to complete multiple processes such as sending large-scale sintering ultra-low emission boiler headers into the factory and moving them horizontally into place in a confined space environment. With the continuous improvement of environmental protection requirements, there will be more and more ultra-low emission adaptive modification projects for sintering machines, so the present invention has great promotion value and a very broad market application prospect.

[0061] Those skilled in the art should understand that they can implement variations by combining the prior art with the above embodiments, which will not be described in detail here. Such variations do not affect the essence of the present invention and will not be described in detail here.

[0062] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A method for hoisting an equipment header, characterized by: The following steps are involved: Step 1: Provide a first header and a hoisting tunnel; wherein the height of the first header is greater than its length; Step 2: Lay down the first header and place it flat at its initial position, then hoist the first header horizontally to the front end so that it enters the entrance of the hoisting tunnel; Step 3: by vertically rotating, tilt the front end of the first header downward until it rests on the translation mechanism provided at the inlet; Step 4: Using the front end of the first header as a fulcrum, rotate the rear end of the first header forward and move it into the hoisting tunnel until the first header stands upright on the translation mechanism; Step 5: Rotate the first header horizontally 90 degrees on the translation mechanism and then drop it so that the splicing surface of the first header faces the entrance of the hoisting tunnel; A first lifting eye is provided at the center position of the left and right sides of the first collection box, and the first lifting eye is connected to a sling of a lifting machinery to form a rotational fit. At the same time, a second lifting eye is provided at the front end position of the first collection box, and the second lifting eye is connected to the sling through a lifting mechanism; wherein in step three, the distance between the front end and the sling is adjusted by operating the lifting mechanism, so that the first collection box rotates vertically with the first lifting eye as the rotation fulcrum; in step four, the lifting machinery is operated to extend the sling into the lifting tunnel, thereby driving the rear end of the first collection box to rotate forward and enter the lifting tunnel; in step five, the lifting machinery is operated to rotate the sling, thereby driving the first collection box to rotate horizontally on the translation mechanism; The first lifting eye comprises a capped steel pipe, and the first lifting eye is connected to the lifting device via a rope sleeved on the capped steel pipe, serving as a main force point for lifting, and forming a rotational fit between the capped steel pipe and the rope; The second lifting lug is a steel ring lifting lug, which is connected to the steel ring lifting lug and the lifting device at the front end of the first header by the lifting mechanism and the steel wire rope, and serves as an auxiliary force point to maintain the balance of the first header; The lifting mechanism includes a hand hoist or an electric hoist; the lifting machinery includes a crane, the crane is provided with a boom, and the boom is connected to the sling via a hook.

2. The equipment collection box hoisting method according to claim 1, characterized in that: The translation mechanism includes parallel tracks laid along the hoisting corridor and a plurality of pulleys arranged thereon.

3. The equipment collection box hoisting method according to any one of claims 1-2, characterized in that: Also includes: Provide a second collection box, and according to steps one to five, horizontally rotate the second collection box on the translation mechanism until the splicing surface faces the splicing surface of the first collection box; then, by manipulating the translation mechanism, bring the second collection box closer to the first collection box so that the splicing surface of the second collection box is closed with the splicing surface of the first collection box, and assemble the second collection box and the first collection box into an integral equipment collection box.

4. The equipment collection box hoisting method according to claim 3, characterized in that: Also includes: The equipment collection box is transported to the installation position along the hoisting corridor by operating the translation mechanism; then, the equipment collection box is lifted and the translation mechanism is removed, so that the equipment collection box falls into place at the installation position.

5. The equipment collection box hoisting method according to claim 3, characterized in that: The hoisting corridor is formed by temporarily removing part of the obstacles between the installation position and the initial position, and is restored after the equipment collection box is installed in place.

6. The equipment collection box hoisting method according to claim 4 or 5, characterized in that: The equipment header includes a boiler header.

Images