Auxiliary device for regular inspection of interior of low-temperature ethylene spherical tank

Abstract

The utility model discloses an auxiliary device for regular inspection of the interior of a low-temperature ethylene spherical tank, which comprises a spherical tank, an arc-shaped overhaul support is arranged in the spherical tank, the radian of the overhaul support is consistent with that of the inner side wall of the spherical tank, and a winding stair platform is arranged in the middle of the overhaul support. Steps are welded to the upper inner arc face and the lower outer arc face of the overhauling support, a top bearing and a bottom bearing are arranged at the top and the bottom in the spherical tank respectively, and the upper end and the lower end of the overhauling support are rotationally connected with the top bearing and the bottom bearing respectively. Compared with the prior art, in order to reduce unnecessary high-risk measures, the arc-shaped overhauling support is arranged in the spherical tank, welding seams at all positions of the spherical surface of the spherical tank can be overhauled by manually pushing the overhauling support to rotate, various requirements of later regular inspection are met, and operation is safe, convenient and fast.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical industry, in particular to an auxiliary device for periodic inspection of the interior of a low-temperature ethylene spherical tank. Background Art

[0002] Currently in the petrochemical field, the conventional design of spherical tanks is to arrange a rotating spiral ladder on the external spherical shell plate of the equipment, and there are some internal extension pipes inside. When the welds and surfaces of the spherical shell plate need to be inspected regularly during the manufacturing or use process, the conventional method is to use a scaffolding method inside or outside. This method is very complicated in actual operation and has many risk points, such as cleaning, replacement, high-altitude operations, and open flames. In order to reduce these unnecessary high-risk measures, this design plans to set up a maintenance auxiliary device inside the spherical tank, which can meet the various needs of subsequent regular inspections, which is safe, convenient and fast. Utility Model Content

[0003] The purpose of the utility model is to provide an auxiliary device for periodic inspection of the interior of a low-temperature ethylene spherical tank which solves the above-mentioned problem.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an auxiliary device for regular inspection of the inside of a low-temperature ethylene spherical tank, comprising a spherical tank, wherein an arc-shaped maintenance bracket is provided inside the spherical tank, the maintenance bracket has the same curvature as the inner wall of the spherical tank, a spiral staircase platform is provided on the middle part of the maintenance bracket, steps are welded on the upper inner arc surface and the lower outer arc surface of the maintenance bracket, a top bearing and a bottom bearing are respectively provided on the top and bottom of the spherical tank, and the upper and lower ends of the maintenance bracket are rotatably connected to the top bearing and the bottom bearing respectively.

[0005] Preferably, the bottom bearing consists of an upper bearing support, a lower bearing support, a bearing ball and a bearing guide sleeve, the bearing ball is positioned between the upper bearing support and the lower bearing support through the bearing guide sleeve, and the upper bearing support and the lower bearing support are rotatably connected through the bearing ball.

[0006] Preferably, a bottom base for mounting a bottom bearing is fixedly provided on the inner bottom surface of the spherical tank, and the lower bearing support is fixedly connected to the bottom base via a flange.

[0007] Preferably, a lower connecting seat is provided at the lower end of the maintenance bracket, and the lower bearing support is fixedly connected to the lower connecting seat via a flange.

[0008] Preferably, the top bearing consists of a bearing inner ring, a bearing outer ring, a connecting shaft and a guide sleeve, the bearing inner ring is fixed to the lower end of the connecting shaft, the bearing outer ring is fixed to the bearing inner ring through the guide sleeve, and is rotatably connected to the bearing inner ring.

[0009] Preferably, a top base for mounting a top bearing is fixedly provided on the inner top surface of the spherical tank, and the connecting shaft is fixedly connected to the top base via a flange.

[0010] Preferably, an upper connecting seat is provided at the upper end of the maintenance bracket, and the outer ring of the bearing is fixedly connected to the upper connecting seat via a flange.

[0011] Preferably, the spiral staircase platform is a revolving spiral staircase, consisting of an upper spiral staircase platform and a lower spiral staircase platform, the upper spiral staircase platform is located at the upper part of the maintenance bracket, the lower spiral staircase platform is located at the lower part of the maintenance bracket, and the upper spiral staircase platform and the lower spiral staircase platform are connected by a walkway.

[0012] Preferably, the upper steps of the inspection bracket are connected to the upper spiral staircase platform, and the lower steps are connected to the lower spiral staircase platform.

[0013] Preferably, the maintenance support is mainly composed of four arc-shaped steel frames arranged in parallel, and connecting rods and inclined tie bars for reinforcement are welded between the four arc-shaped steel frames.

[0014] Compared with the prior art, the utility model has the following advantages: in order to reduce unnecessary high-risk measures, the utility model provides an arc-shaped maintenance bracket inside the spherical tank. By manually pushing the maintenance bracket to rotate, the welds at various locations on the spherical surface of the spherical tank can be inspected to meet various needs of subsequent regular inspections. The operation is safe, convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall assembly of the utility model;

[0016] Figure 2 It is a schematic diagram of the middle part of the maintenance bracket of the utility model;

[0017] Figure 3 It is a schematic diagram of the lower part of the maintenance bracket of the utility model;

[0018] Figure 4 It is a schematic diagram of the upper part of the maintenance bracket of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the bottom bearing of the utility model;

[0020] Figure 6 It is a schematic cross-sectional view of the bottom bearing of the utility model taken along the line AA;

[0021] Figure 7 It is a structural schematic diagram of the top bearing of the utility model.

[0022] In the figure, 1. spherical tank; 11. bottom base; 12. top base; 2. maintenance bracket; 21. arc-shaped steel frame; 22. connecting rod; 23. oblique tie rod; 24. lower connecting seat; 25. upper connecting seat; 3. spiral staircase platform; 31. upper spiral staircase platform; 32. lower spiral staircase platform; 33. walkway; 4. stair steps; 5. top bearing; 51. connecting shaft; 52. outer ring of bearing; 53. guide sleeve; 54. inner ring of bearing; 6. bottom bearing; 61. upper bearing support; 62. lower bearing support; 63. bearing guide sleeve; 64. bearing ball. DETAILED DESCRIPTION

[0023] The utility model will be further described below.

[0024] An auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank, see Figures 1 to 7 , including a spherical tank 1, wherein an arc-shaped maintenance bracket 2 is arranged inside the spherical tank 1, wherein the maintenance bracket 2 is consistent with the curvature of the inner wall of the spherical tank 1, wherein a spiral staircase platform 3 is arranged in the middle of the maintenance bracket 2, wherein a top bearing 5 and a bottom bearing 6 are arranged at the top and the bottom of the spherical tank 1, respectively, wherein the upper and lower ends of the maintenance bracket 2 are rotatably connected to the top bearing 5 and the bottom bearing 6, respectively. In order to reduce these unnecessary high-risk measures, the utility model arranges an arc-shaped maintenance bracket 2 inside the spherical tank 1, and by manually pushing the maintenance bracket 2 to rotate, the welds at various places on the spherical surface of the spherical tank 1 can be inspected to meet various needs of periodic inspections in the later stage, and the operation is safe, convenient and fast.

[0025] The bottom bearing 6 consists of an upper bearing support 61, a lower bearing support 62, a bearing ball 64 and a bearing guide sleeve 63. The bearing ball 64 is positioned between the upper bearing support 61 and the lower bearing support 62 through the bearing guide sleeve 63. The upper bearing support 61 and the lower bearing support 62 are rotatably connected through the bearing ball 64, and the lower end of the maintenance bracket 2 is rotatably connected through the bottom bearing 6.

[0026] The inner bottom surface of the spherical tank 1 is fixedly provided with a bottom base 11 for installing a bottom bearing 6, and the lower bearing support 62 is fixedly connected to the bottom base 11 through a flange. The lower end of the maintenance bracket 2 is provided with a lower connecting seat 24, and the lower bearing support 62 is fixedly connected to the lower connecting seat 24 through a flange. The connection between the inner maintenance bracket 2 and the bottom bearing 6 and the bottom base 11 of the spherical tank 1 is realized through the flange, and installation and disassembly are also very convenient.

[0027] The top bearing 5 is composed of a bearing inner ring 54, a bearing outer ring 52, a connecting shaft 51 and a guide sleeve 53. The bearing inner ring 54 is fixed to the lower end of the connecting shaft 51. The bearing outer ring 52 is fixed to the bearing inner ring 54 through the guide sleeve 53 and is rotatably connected to the bearing inner ring 54. The lower end of the maintenance bracket 2 is rotatably connected through the bottom bearing 6.

[0028] The top surface of the spherical tank 1 is fixedly provided with a top base 12 for installing the top bearing 5, and the connecting shaft 51 is fixedly connected to the top base 12 via a flange. The upper end of the inspection bracket 2 is provided with an upper connecting seat 25, and the outer ring 52 of the bearing is fixedly connected to the upper connecting seat 25 via a flange. The connection between the inner inspection bracket 2 and the top bearing 5 and the top base 12 of the spherical tank 1 is realized through the flange, and installation and disassembly are also very convenient.

[0029] The spiral staircase platform 3 is a revolving spiral staircase, which consists of an upper spiral staircase platform 31 and a lower spiral staircase platform 32. The upper spiral staircase platform 31 is located at the upper part of the maintenance bracket 2, and the lower spiral staircase platform 32 is located at the lower part of the maintenance bracket 2. The upper spiral staircase platform 31 and the lower spiral staircase platform 32 are connected by a walkway 33. The spiral staircase platform 3 serves as a transfer platform for safe switching between the upper steps 4 and the lower steps 4. Maintenance personnel can rest on the spiral staircase platform 3 and inspect the welds in the middle of the spherical tank 1.

[0030] Steps 4 are welded on the upper inner arc surface and the lower outer arc surface of the maintenance bracket 2, the upper step 4 is connected to the upper spiral staircase platform 31, and the lower step 4 is connected to the lower spiral staircase platform 32. When the inspector is inspecting the lower weld of the spherical tank 1, the personnel is located at the lower part of the maintenance bracket 2, and the force-bearing surface of the maintenance bracket 2 is concentrated on the outer arc surface. Welding the steps 4 on the outer arc surface can not only increase the structural strength of the outer arc surface of the maintenance bracket 2, but also the maintenance brackets 2 on both sides can also play a safety protection role; when the inspector is inspecting the upper weld of the spherical tank 1, the personnel is located at the upper part of the maintenance bracket 2, and the force-bearing surface of the maintenance bracket 2 is concentrated on the inner arc surface. Welding the steps 4 on the inner arc surface can not only increase the structural strength of the inner arc surface of the maintenance bracket 2, but also the maintenance brackets 2 on both sides can also play a safety protection role.

[0031] The maintenance bracket 2 is mainly composed of four parallel arc-shaped steel frames 21, and connecting rods 22 and inclined reinforcement bars 23 are welded between the four arc-shaped steel frames 21. The four arc-shaped steel frames 21 are connected into one by the connecting rods 22 to form an arc-shaped maintenance bracket 2. The inclined reinforcement bars 23 are designed to improve the structural strength of the entire maintenance bracket 2.

[0032] To facilitate the implementation of the project, under the action of the self-weight and rated working load of the maintenance bracket 2, ANSYS analysis was used to simulate the strength and stiffness characteristics of the ladder and the upper and lower bearings through structural static simulation, and analyze their stress and deformation; ADAMS mechanical system simulation software was used to simulate the rotation starting torque of the ladder under human power through multi-body dynamics simulation. 3 Take the pressurized ethylene spherical tank 1 as an example, the maintenance bracket 2 is entered, such as Figure 1The outer diameter of the maintenance support 2 is 19.5m, the inner diameter is 17.5m, and the overall weight is about 4400kg. Determine the relevant parameters:

[0033] Material parameters

[0034]

[0035] Bearing friction parameters

[0036]

[0037] Conclusion: 1. The inspection bracket 2 is bounded by the spiral staircase platform 3, with the upper part under tension and the lower part under compression. Without considering the stress concentration at the joints of round steel and angle steel, the overall stress level is below 100MPa, and the strength meets the requirements, but attention should still be paid to the welding quality at the joints of the rods to ensure sufficient welding area. There is a high stress area on the inner edge of the upper bearing outer ring 52, and the strength of the lower bearing meets the requirements.

[0038] 2. Constrained by load and boundary, the maximum deformation of the spiral staircase occurs in the transition area between the middle and lower parts, which is 20.9 mm. The stiffness meets the requirements, and the main direction of deformation is vertical. The bearing deformation meets the stiffness requirements.

[0039] 3. With the cooperation of two staff members, the thrust of 400N of a single adult can overcome inertia and static friction and realize the rotation start of the spiral staircase.

[0040] The above is a detailed introduction to the auxiliary device and process for periodic inspection of the interior of a low-temperature ethylene spherical tank provided by the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope, and changes and improvements to the utility model will be possible without exceeding the concept and scope specified in the attached claims. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. An auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank, characterized in that: It comprises a spherical tank, wherein an arc-shaped maintenance bracket is arranged inside the spherical tank, the maintenance bracket has the same curvature as the inner wall of the spherical tank, a spiral staircase platform is arranged in the middle of the maintenance bracket, steps are welded on the upper inner arc surface and the lower outer arc surface of the maintenance bracket, a top bearing and a bottom bearing are arranged at the top and the bottom of the spherical tank respectively, and the upper and lower ends of the maintenance bracket are rotatably connected to the top bearing and the bottom bearing respectively.

2. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 1, characterized in that: The bottom bearing is composed of an upper bearing support, a lower bearing support, a bearing ball and a bearing guide sleeve. The bearing ball is positioned between the upper bearing support and the lower bearing support through the bearing guide sleeve. The upper bearing support and the lower bearing support are rotatably connected through the bearing ball.

3. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 2, characterized in that: A bottom base for mounting a bottom bearing is fixedly arranged on the inner bottom surface of the spherical tank, and the lower bearing support is fixedly connected to the bottom base via a flange.

4. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 2, characterized in that: A lower connecting seat is provided at the lower end of the inspection bracket, and the lower bearing support is fixedly connected to the lower connecting seat through a flange.

5. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 1, characterized in that: The top bearing is composed of a bearing inner ring, a bearing outer ring, a connecting shaft and a guide sleeve. The bearing inner ring is fixed to the lower end of the connecting shaft, and the bearing outer ring is fixed to the bearing inner ring through the guide sleeve and is rotatably connected to the bearing inner ring.

6. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 5, characterized in that: A top base for mounting a top bearing is fixedly provided on the inner top surface of the spherical tank, and the connecting shaft is fixedly connected to the top base via a flange.

7. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 5, characterized in that: An upper connecting seat is provided at the upper end of the maintenance bracket, and the outer ring of the bearing is fixedly connected to the upper connecting seat through a flange.

8. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 1, characterized in that: The spiral staircase platform is a revolving spiral staircase, which consists of an upper spiral staircase platform and a lower spiral staircase platform. The upper spiral staircase platform is located at the upper part of the maintenance bracket, and the lower spiral staircase platform is located at the lower part of the maintenance bracket. The upper spiral staircase platform and the lower spiral staircase platform are connected by a walkway.

9. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 8, characterized in that: The steps at the upper part of the inspection bracket are connected to the upper spiral staircase platform, and the steps at the lower part are connected to the lower spiral staircase platform.

10. The auxiliary device for periodic inspection of the interior of a cryogenic ethylene spherical tank according to claim 1, characterized in that: The maintenance support is mainly composed of four arc-shaped steel frames arranged in parallel, and connecting rods and inclined tie bars for reinforcement are welded between the four arc-shaped steel frames.

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