A special construction platform for radiation beams in a granulation chamber and its installation method

Abstract

The present invention provides a special construction platform for a radiation beam in a granulation chamber and an installation method thereof, wherein the construction platform includes a rotating support mechanism, a column, and a first workbench. The rotating support mechanism is fixedly arranged, and the upper end of the column is rotatably mounted on the rotating support mechanism and driven to rotate by the rotating support mechanism. The first workbench is arranged horizontally and its middle portion is fixedly connected to the middle portion of the column. Second workbench are distributed in a circular array around the first workbench. The second workbench is a downwardly inclined strip structure. The upper end of the strip structure is fixedly connected to the first workbench, and a support structure is fixedly connected to the lower portion of the column in the middle portion of the strip structure. The workbench is arranged below the granulation chamber and the radiation beam by the rotating support mechanism and the column. The rotation of the workbench is achieved by rotating the column, thereby allowing workers on the workbench to operate on the radiation beam at the corresponding position. The present invention has a reasonable structural design, is convenient for assembly, disassembly, and construction, and has a short construction period.

Description

Technical Field

[0001] The invention relates to a maintenance technology of a supporting structure below a granulation chamber in a granulation tower, and in particular to a special construction platform for a radiation beam of a granulation chamber and an installation method thereof. Background Art

[0002] A urea granulation tower is a device used to produce granular urea. Urea solution is concentrated to over 99.5% by evaporation. The resulting urea melt is pumped to the top of the granulation tower, where it is sprayed by nozzles as falling droplets. These droplets then come into contact with air in a countercurrent, cooling and solidifying into granular urea particles with a diameter of 0.8 to 2.5 mm. The granulation tower is typically a vertical, hollow cylindrical structure cast in reinforced concrete. It features an exhaust vent and an operating chamber at the top, a nozzle in the center of the upper tower, an air inlet and a material collection device (a conical hopper and scraper) at the bottom, and sometimes a fluidized bed cooler. To prevent urea dust from contaminating the environment, the tower is equipped with a filter or a water spray wet dust removal system. Because urea is highly corrosive to cement, the inner wall of the tower must be protected by a coating typically made of polyurethane or epoxy resin, though acid-resistant bricks and other materials may be used for lining. The protective layer must be smooth and dense. The tower's height should ensure that the droplets have sufficient time to solidify and cool in contact with air.

[0003] Among them, a granulation chamber is provided at the top end of the granulation tower. The granulation chamber is suspended and fixedly connected to the inner wall of the granulation tower through an inclined radiation beam. The radiation beams are evenly distributed around the lower part of the granulation chamber and the upper end thereof is fixedly connected to the granulation chamber. The radiation beams are made of reinforced concrete and a corrosion-resistant coating needs to be provided on the radiation beams. However, the coating on the radiation beams needs to be renovated after four to five years. With the requirements of construction, it is now necessary to design a special construction platform for the radiation beams for renovating the coating on the radiation beams, which needs to be easy to assemble and construct. Summary of the Invention

[0004] In response to the needs in the prior art, the present invention provides a special construction platform for a radiation beam in a granulation chamber and an installation method thereof.

[0005] A special construction platform for a radiation beam in a granulation chamber, comprising a rotating support mechanism, a column and a first workbench, wherein the rotating support mechanism is fixedly arranged, the upper end of the column is rotatably mounted on the rotating support mechanism and driven to rotate by the rotating support mechanism, the first workbench is horizontally arranged and the middle part thereof is fixedly connected to the middle part of the column, a second workbench is distributed in a circular array around the first workbench, the second workbench is a downwardly inclined strip structure, the upper end of the strip structure is fixedly connected to the first workbench, and a support structure is fixedly connected to the lower part of the column in the middle part of the strip structure.

[0006] The working principle of the present invention is as follows: the rotating support mechanism is fixedly arranged in the granulation chamber, the upper end of the column is inserted into the granulation chamber and rotatably installed on the rotating support mechanism, the first workbench and the second workbench are suspended below the granulation chamber through the column, and a person-high distance is left between the first workbench and the bottom of the granulation chamber. The second workbench is arranged parallel to the radiation beam and a half-person-high distance is left between the two. The length of the second workbench matches the length of the radiation beam. The worker prepares the paint on the first workbench and then operates on the radiation beam on the second workbench; in addition, when the radiation beam near the second workbench needs to be operated, the second workbench can be rotated and moved to the radiation beam through the rotating support mechanism.

[0007] Further: the rotating support mechanism includes a slewing bracket and a lifting rope, the upper end of the lifting rope is fixedly arranged, the lower end of the lifting rope is fixedly connected to a rotating hook, the rotating hook is clamped on the upper end of the column, and a slewing support is installed between the column and the slewing bracket, and the slewing support is driven to rotate by a reducer fixed on the slewing bracket.

[0008] Furthermore, the hoisting rope is wound around a winch, which is fixedly connected to the hoisting bracket and is located directly above the slewing support. The hoisting rope is raised and lowered by the winch, driving the uprights up and down, thereby installing the first and second workbenches on the uprights on the ground, and then raising the workbenches to a working height.

[0009] Furthermore, a rope guide mechanism is fixedly provided on the hoisting bracket at a position corresponding to the hoisting rope. The rope guide mechanism includes two grooved wheels arranged in parallel. The grooves of the two grooved wheels are arranged opposite to each other and a circular groove is formed between the grooves. The hoisting rope is passed through the circular groove. The hoisting rope is confined between the circular grooves to prevent the hoisting rope from swinging left and right.

[0010] Further: The first workbench includes a central platform and a connecting platform. The central platform includes a first frame structure with a regular polygonal upper plane. The center position of the first frame structure is fixedly connected to the column. The connecting platform is a second frame structure with a rectangular upper plane. The second workbench is fixedly connected to the second frame structure in the first workbench. The inner end of the second frame is fixedly connected to the side of the central platform. The outer end of the second frame structure is fixedly connected to the upper end of the first workbench. First handrails are fixedly connected to the opposite side edges of the connecting platform. A first aisle is formed between the first handrail and the upper plane of the connecting platform. The first workbench is split into two parts to facilitate the production and assembly of the first workbench.

[0011] Furthermore: the supporting structure is supported below the connecting platform to increase the structural strength of the first workbench.

[0012] Further: The strip structure of the second workbench includes an inclined ladder, with second handrails fixedly connected on both sides of the ladder, forming a second aisle between the ladder and the second handrail, and the support structure is supported under the ladder in the second workbench, and the ladder in the second workbench is fixedly connected to the connecting platform.

[0013] Furthermore, the ladder includes an upper ladder, which is arranged parallel to the radial beams. The upper end of the upper ladder is fixedly connected to the connecting platform, and the lower end of the upper ladder is fixedly connected to two lower ladders, which are symmetrically arranged about a downward extension of the upper ladder. When working, workers sometimes need to work on the side walls of the radial beams between adjacent radial beams. The gap between the lower ends of adjacent radial beams is large, making it inconvenient to operate with one ladder. Therefore, two lower ladders are arranged close to the side walls of two adjacent radial beams, respectively. This facilitates workers to work on the side walls of the lower ends of adjacent radial beams.

[0014] Furthermore, the invention further comprises a lifting basket, the lifting basket being located between adjacent connecting platforms, the lifting basket comprising a crossbeam and a basket, the crossbeam being arranged across the adjacent connecting platforms and being fixedly connected to the corresponding connecting platforms, and the lifting ropes at both ends of the basket being fixedly connected to the crossbeam. The provision of the lifting basket facilitates the transport of materials from the ground to the work platform and facilitates workers to get on and off the work platform.

[0015] A method for installing a special construction platform for a radiation beam in a granulation chamber, wherein a mounting opening is provided at the center of a bottom plate of the granulation chamber, comprising the following steps:

[0016] Step 1: a rotating support mechanism is fixedly arranged on the bottom plate of the granulation chamber at the installation opening;

[0017] Step 2: A winch is fixedly installed on the top plate of the granulation chamber at a position corresponding to the rotating support mechanism;

[0018] Step 3: Fix the first workbench, the second workbench and the supporting structure on the pillars on the ground;

[0019] Step 4: Pass the hoisting rope wound on the hoist through the installation opening and drop it to the ground, and fix the rotating hook at the lower end of the hoisting rope. The optional hook is clamped on the upper end of the column;

[0020] Step 5: Lift the column by the hoisting rope and place the upper end of the column in the rotating support mechanism;

[0021] Step 6: The rotating support mechanism includes a slewing bracket, a slewing support and a reducer. The slewing bracket is fixedly connected to the bottom plate of the granulation chamber. The slewing support and the reducer are fixedly installed on the slewing bracket and the slewing support and the reducer are linked. The column is fixedly installed on the slewing support and rotates with the slewing support.

[0022] Furthermore, the hoist is located outside the granulation chamber and on the top plate of the granulation chamber. A through hole for passing a lifting rope is provided at a position corresponding to the mounting opening on the top plate. The lifting rope is positioned within the through hole. A rope guide mechanism is fixedly provided on the lifting bracket at a position corresponding to the lifting rope. The rope guide mechanism comprises two grooved wheels arranged in parallel, the grooves of the two grooved wheels being arranged opposite to each other and forming a circular through groove between the grooves. The lifting rope is passed through the circular through groove. The rotating support mechanism is located within the granulation chamber and on the bottom plate of the granulation chamber. The upright post is provided through the mounting opening. This facilitates the installation and fixation of the hoist and prevents the through hole from rubbing against the lifting rope.

[0023] The beneficial effects of the present invention are as follows: the workbench is arranged below the granulation chamber and the radiation beam by means of a rotating support mechanism and a column, and the rotation of the workbench is achieved by rotating the column, so that the workers on the workbench can operate on the radiation beam at the corresponding position; the rotating support mechanism is arranged on the bottom plate and the top plate of the granulation chamber, the structure is stable, easy to set up, and has a strong load-bearing capacity; the rotating support mechanism, the column and the workbench are easy to assemble and disassemble, which facilitates rapid construction and shortens the construction period; the structural design of the present invention is reasonable, easy to assemble, disassemble and construct, and the construction period is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the construction platform of the present invention;

[0025] Figure 2 This is a schematic diagram of the assembly structure of the slewing bracket, slewing support and reducer in the construction platform;

[0026] Figure 3 This is a schematic diagram of the assembly structure of the workbench and columns in the construction platform;

[0027] Figure 4 This is a schematic diagram of the assembly structure of the winch and lifting bracket in the construction platform;

[0028] Figure 5 This is a schematic diagram of the assembly structure connecting the platform and the lifting basket in the construction platform;

[0029] Figure 6 This is a schematic diagram of the structure of the ladder in the construction platform from a bird's-eye view;

[0030] Figure 7 This is a top view of the relationship between the ladder and the radial beam;

[0031] Figure 8 This is a cross-sectional rendering of the positional relationship among the construction platform, granulation chamber, and radiation beam.

[0032] In the figure, 1. rotating support mechanism; 11. lifting rope; 12. slewing bracket; 13. slewing support; 14. lifting bracket; 15. winch; 16. reinforcing rope; 17. reducer; 18. rope guide mechanism; 2. workbench; 21. first workbench; 211. central platform; 212. connecting platform; 213. first handrail; 22. second workbench; 221. ladder; 222. second handrail; 2211. upper ladder; 2212. lower ladder; 3. column; 4. supporting structure; 5. lifting basket; 51. crossbeam; 52. basket; 6. granulation chamber; 61. ventilation wall; 62. cantilever crane; 63. granulation chamber top plate; 64. granulation chamber bottom plate; 7. radiation beam; 8. granulation tower. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings. The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. The terms such as left, center, right, top, and bottom in the examples of the present invention are merely relative concepts or are based on the normal use state of the product and should not be considered as restrictive.

[0034] A special construction platform for radiation beams in a granulation chamber, comprising a rotating support mechanism 1, a column 3 and a first workbench 21. The rotating support mechanism 1 is fixedly arranged, and the upper end of the column 3 is rotatably mounted on the rotating support mechanism 1 and driven to rotate by the rotating support mechanism 1. The first workbench 21 is horizontally arranged and the middle part thereof is fixedly connected to the middle part of the column 3. A second workbench 22 is distributed in a circular array around the first workbench 21. The second workbench 22 is a downwardly inclined strip structure. The upper end of the strip structure is fixedly connected to the first workbench 21, and a support structure 4 is fixedly connected to the lower part of the column 3 in the middle part of the strip structure.

[0035] The rotating support mechanism 1 includes a slewing bracket 12 and a lifting rope 11. The upper end of the lifting rope 11 is fixedly arranged, and the lower end of the lifting rope 11 is fixedly connected to a rotating hook. The rotating hook is clamped to the upper end of the column 3. A slewing support 13 is installed between the column 3 and the slewing bracket 12. The slewing support 13 is driven to rotate by a reducer 17 fixed to the slewing bracket 12. The lifting rope 11 is wound around a winch 15, which is fixedly connected to the lifting bracket 14. The winch 15 is located directly above the slewing support 13. A rope guide mechanism 18 is fixedly arranged on the lifting bracket 14 at a position corresponding to the lifting rope 11. The rope guide mechanism 18 includes two grooved wheels arranged in parallel. The grooves of the two grooved wheels are arranged opposite to each other and form a circular through groove between the two grooves. The lifting rope 11 is passed through the circular through groove.

[0036] The first workbench 21 includes a central platform 211 and a connecting platform 212. The central platform 211 includes a first frame structure with a regular polygonal upper plane. The center position of the first frame structure is fixedly connected to the column 3. A flange structure is fixedly provided at the center position of the first frame structure. The first frame structure is fixedly connected to the column 3 through the flange structure. The connecting platform 212 is a second frame structure with a rectangular upper plane. The second workbench 22 is fixedly connected to the second frame structure in the first workbench 21. The inner end of the second frame structure is fixedly connected to the side of the central platform 211. The outer end of the second frame structure is fixedly connected to the upper end of the first workbench 21. First handrails 213 are fixedly connected to the opposite side edges of the connecting platform 212. A first aisle is formed between the first handrail 213 and the upper plane of the connecting platform 212. The support structure is also supported below the connecting platform.

[0037] In addition, the strip-shaped structure of the second workbench 22 includes an inclined ladder 221, with second handrails 222 fixedly connected to both sides of the ladder 221, forming a second aisle between the ladder 221 and the second handrail 222. The support structure 4 is supported below the ladder 221 in the second workbench 22, and the ladder 221 in the second workbench 22 is fixedly connected to the connecting platform 212. The ladder 221 includes an upper ladder 2211, which is arranged parallel to the radiating beam 7. The upper end of the upper ladder 2211 is fixedly connected to the connecting platform 212, and two lower ladders 2212 are fixedly connected to the lower end of the upper ladder 2211. The two lower ladders 2212 are symmetrically arranged about the downward extension line of the upper ladder 2211. It also includes a lifting basket 5, which is located between adjacent connecting platforms 212. The lifting basket 5 includes a crossbeam 51 and a basket 52. The crossbeam 51 is arranged across between adjacent connecting platforms 212 and is fixedly connected to the corresponding connecting platforms. The lifting ropes at both ends of the basket 52 are fixedly connected to the crossbeam 51.

[0038] The present invention operates as follows: a rotating support mechanism is fixedly mounted within the granulation chamber, the upper end of a column is inserted into the chamber and rotatably mounted on the rotating support mechanism. A first workbench and a second workbench are suspended below the granulation chamber via the column, with a clearance of one person's height between the first workbench and the chamber floor. The second workbench is parallel to the radial beams, with a clearance of half a person's height between them. The length of the second workbench matches the length of the radial beams. Workers prepare paint on the first workbench and then work on the radial beams on the second workbench. Furthermore, when work is needed on the radial beams near the second workbench, the second workbench can be rotated and moved to the radial beams via the rotating support mechanism. Workers sometimes need to work on the sides of adjacent radial beams between them. The gap between the lower ends of adjacent radial beams is large, making it difficult to operate with a single ladder. Two lower ladders, one near each of the adjacent radial beams, are provided to facilitate access. A lifting basket is provided to facilitate transporting materials from the ground to the workbench and for workers to access the workbench.

[0039] A method for installing a special construction platform for a radiation beam in a granulation chamber, comprising: Figure 8 As shown, a mounting opening is provided at the center of the granulation chamber bottom plate 64, and the steps include:

[0040] Step 1: A rotating support mechanism 1 is fixedly installed at the installation opening on the granulation chamber bottom plate 64;

[0041] Step 2: A hoist 15 is fixedly installed on the top plate 63 of the granulation chamber at a position corresponding to the rotating support mechanism 1;

[0042] Step 3: Fix the first workbench 21, the second workbench 22 and the support structure 4 on the column 3 on the ground;

[0043] Step 4: Pass the hoisting rope 11 wound on the hoist 15 through the installation opening and drop it to the ground. Fix a rotating hook to the lower end of the hoisting rope 11. The optional hook is clamped to the upper end of the column 3.

[0044] Step 5: Lift the column 3 by the hoisting rope 11 and place the upper end of the column 3 in the rotating support mechanism 1;

[0045] Step 6: The rotating support mechanism 1 includes a slewing bracket 12, a slewing support 13 and a reducer 17. The slewing bracket 12 is fixedly connected to the bottom plate 64 of the granulation chamber. The slewing support 13 and the reducer 17 are fixedly installed on the slewing bracket 12 and the slewing support 13 and the reducer 17 are linked. The column 3 is fixedly installed on the slewing support 13 and rotates with the slewing support 13.

[0046] The winch 15 is located outside the granulation chamber 6 and on the top plate 63 of the granulation chamber. A through hole for passing the lifting rope 11 is opened at a position corresponding to the installation opening on the top plate 63 of the granulation chamber. The lifting rope 11 is located in the through hole. A rope guide mechanism 18 is fixedly provided on the lifting bracket 14 at a position corresponding to the lifting rope 11. The rope guide mechanism 18 includes two grooved wheels arranged in parallel, and the grooves of the two grooved wheels are arranged relative to each other and a circular through groove is formed between the grooves of the two wheels. The lifting rope 11 is passed through the circular through groove; the rotating support mechanism 1 is located in the granulation chamber 6 and on the bottom plate 64 of the granulation chamber, and the column 3 is arranged through the installation opening.

[0047] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for installing a special construction platform for radiation beams in a granulation chamber, wherein a mounting opening is provided at the center of the bottom plate of the granulation chamber, characterized in that: The following steps are involved: Step 1: a rotating support mechanism is fixedly arranged on the bottom plate of the granulation chamber at the installation opening; Step 2: A winch is fixedly installed on the top plate of the granulation chamber at a position corresponding to the rotating support mechanism, and the winch is fixedly connected to the lifting bracket; Step 3: On the ground, the first workbench, the second workbench, and the support structure are fixedly installed on the column. The first workbench is arranged horizontally and the middle part thereof is fixedly connected to the middle part of the column. The second workbench is distributed in a circular array around the first workbench. The second workbench is a downwardly inclined strip structure. The upper end of the strip structure is fixedly connected to the first workbench, and the support structure is fixedly connected to the lower part of the column in the middle part of the strip structure. Step 4: Pass the hoisting rope wound on the winch through the installation opening and drop it to the ground. Fix the rotating hook at the lower end of the hoisting rope and clip the optional hook to the upper end of the column. Step 5: Lift the column by the hoisting rope and place the upper end of the column in the rotating support mechanism; Step 6: The rotating support mechanism includes a slewing bracket, a slewing support and a reducer. The slewing bracket is fixedly connected to the bottom plate of the granulation chamber. The slewing support and the reducer are fixedly installed on the slewing bracket and the slewing support and the reducer are linked. The column is fixedly installed on the slewing support and rotates with the slewing support.

2. The method for installing a special construction platform for radiation beams in a granulation chamber according to claim 1, characterized in that: The winch is located outside the granulation chamber and on the top plate of the granulation chamber, and a through hole for passing a lifting rope is opened at a position corresponding to the mounting opening on the top plate, and the lifting rope is located in the through hole. A rope guide mechanism is fixedly provided on the lifting bracket at a position corresponding to the lifting rope, and the rope guide mechanism includes two groove wheels arranged in parallel, the grooves of the two groove wheels are arranged opposite to each other and a circular through groove is formed between the grooves of the two grooves, and the lifting rope is passed through the circular through groove; the rotating support mechanism is located in the granulation chamber and on the bottom plate of the granulation chamber, and the column is arranged through the mounting opening.

3. The installation method of a special construction platform for radiation beams in a granulation chamber according to claim 1, characterized in that: The first workbench includes a central platform and a connecting platform. The central platform includes a first frame structure with an upper plane being a regular polygon. The center position of the first frame structure is fixedly connected to the column. The connecting platform is a second frame structure with an upper plane being a rectangle. The second workbench is fixedly connected to the second frame structure in the first workbench. The inner end of the second frame is fixedly connected to the side of the central platform. The outer end of the second frame structure is fixedly connected to the upper end of the first workbench. First handrails are fixedly connected to the opposite side edges of the connecting platform. A first aisle is formed between the first handrail and the upper plane of the connecting platform.

4. The method for installing a dedicated construction platform for radiation beams in a granulation chamber according to claim 3, characterized in that: The strip structure of the second workbench includes an inclined ladder, with second handrails fixedly connected to both sides of the ladder, forming a second aisle between the ladder and the second handrail, and the supporting structure is supported under the ladder in the second workbench, and the ladder in the second workbench is fixedly connected to the connecting platform.

5. The method for installing a special construction platform for radiation beams in a granulation chamber according to claim 4, characterized in that: The ladder comprises an upper ladder, the upper end of which is fixedly connected to the connecting platform, and two lower ladders are fixedly connected to the lower end of the upper ladder, and the two lower ladders are symmetrically arranged about a downward extension line of the upper ladder.

6. The method for installing a dedicated construction platform for radiation beams in a granulation chamber according to claim 3, characterized in that: It comprises a lifting basket, which is located between adjacent connecting platforms.

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