Manhole structure of lower sealing head

Abstract

The utility model relates to a lower seal head manhole structure, which comprises a manhole connecting pipe welded with a lower seal head, a flange, a flange cover and a steering mechanism, the steering mechanism comprises a rotating shaft, a support plate welded with the manhole connecting pipe, a guide plate welded with the flange, a connecting plate welded with the flange cover and a rotating wheel mechanism arranged at the top of the rotating shaft, the rotating shaft sequentially penetrates through the supporting plate, the guide plate and the connecting plate, the rotating shaft is welded to the connecting plate, the rotating shaft is rotatably connected with the supporting plate and the guide plate, the rotating wheel mechanism comprises a stud, a first rotating wheel, a second rotating wheel, a first nut and a second nut, the stud vertically penetrates through the rotating shaft, and the first rotating wheel is connected with the second rotating wheel. The first rotating wheel and the first nut are located on one side of the rotating shaft, the second rotating wheel and the second nut are located on the other side of the rotating shaft, and when the flange cover is put down, the first rotating wheel and the second rotating wheel are supported on the supporting plate, so that the labor intensity of workers is reduced, and the service life of the manhole structure is prolonged.

Description

[Technical Field]

[0001] This utility model relates to the field of reaction vessels, and in particular to a manhole structure for the lower end cap of a reaction vessel. [Background Technology]

[0002] A reaction vessel is a container used to complete physical or chemical reactions of a medium. In industrial production, especially in the chemical, pharmaceutical, fertilizer, and refining industries, reaction vessels are widely used as pressure-bearing equipment due to process requirements.

[0003] Manhole structures are installed on the reaction vessel for ease of maintenance. Please refer to [link / reference]. Figure 1 , Figure 1 This invention discloses a manhole structure installed at the lower head of a vertical reaction vessel. Due to the high operating temperature of the vertical reaction vessel, heat-insulating linings are provided inside both the reaction vessel and the manhole. The manhole structure includes: a manhole connector 2' welded to the lower head 1', a flange 3', a flange cover 4', and a steering mechanism 5'. The steering mechanism 5' includes: a rotating shaft 50', a guide plate 51' welded to the manhole connector 2', a support plate 52' welded to the flange 3', and a connecting plate 53' welded to the flange cover 4'. The rotating shaft 50' passes sequentially through the guide plate 51', the support plate 52', and the connecting plate 53', and is welded to the connecting plate 53'. The rotating shaft 50' forms a rotatable connection with the guide plate 51' and the support plate 52'. A retaining ring 54' is welded to the rotating shaft 50' at a position between the guide plate 51' and the support plate 52'. Because the manhole structure is installed at the lower head of a vertical reaction vessel, the industry standard is to design the manhole flange cover as a horizontal opening structure, rather than a vertical opening structure. If designed as a vertical opening structure, it would be dangerous for workers operating from below, and pushing the flange cover upwards would be difficult. Therefore, the industry generally designs the manhole structure at the lower head of a vertical reaction vessel as a horizontal opening structure. Since the manhole has an insulating lining 6', the flange cover 4' is opened as follows: after removing the fastener 7', lower the flange cover 4' by 100mm (because the insulating lining 6' is 100mm thick, only by lowering the flange cover 4' can it be opened). Flange cover 4' needs to be lowered by 100mm to open horizontally. After the flange cover 4' is lowered by 100mm, since the rotating shaft 50' is fixedly connected to the flange cover 4', the rotating shaft 50' also lowers by 100mm along with the flange cover 4', so that the retaining ring 54' on the rotating shaft 50' is supported on the support plate 52'. Then, the worker rotates the flange cover 4' horizontally to open the flange cover 4'. In our daily work, we found that because the retaining ring 54' is supported on the support plate 52 for rotation, it is relatively difficult for the worker to operate. Therefore, we thought about how to improve the above structure to make the horizontal opening operation of the flange cover 4' easier. TECHNICAL SOLUTION

[0004] In order to solve the above problems, the utility model discloses a lower head manhole structure convenient for workers to operate.

[0005] In order to achieve the above object, the utility model takes the technical scheme as follows: a lower head manhole structure, comprising: a manhole connecting pipe welded with a lower head, a flange, a flange cover and a steering mechanism, the steering mechanism comprising: a rotating shaft, a support plate welded with the manhole connecting pipe, a guide plate welded with the flange, a connecting plate welded with the flange cover and a rotating wheel mechanism arranged at the top of the rotating shaft, the rotating shaft sequentially passes through the support plate, the guide plate and the connecting plate, the rotating shaft is welded with the connecting plate, and the rotating shaft is rotatably connected with the support plate and the guide plate, the rotating wheel mechanism comprising: a stud, a first rotating wheel, a second rotating wheel, a first nut and a second nut, the stud is vertically arranged in the rotating shaft, the first rotating wheel and the first nut are located on one side of the rotating shaft, the second rotating wheel and the second nut are located on the other side of the rotating shaft, and when the flange cover is lowered, the first rotating wheel and the second rotating wheel are supported on the support plate.

[0006] Preferably, the lower head manhole structure in the utility model is further provided with a gasket above the support plate.

[0007] Preferably, the lower head manhole structure in the utility model is further provided with three flange cover lifting lugs uniformly distributed in the circumferential direction of the flange cover, and the lower head is correspondingly provided with three lower head lifting lugs, and the flange cover lifting lug and the lower head lifting lug are connected through a manual hoist.

[0008] Preferably, the lower head manhole structure in the utility model is further provided with a plurality of fixing members connecting the flange cover and the flange.

[0009] Preferably, the fixing member is a stud and a nut.

[0010] Preferably, the lower head manhole structure in the utility model is further provided with the support plate, the guide plate and the connecting plate, and the three are arranged in parallel, and the rotating shaft is arranged vertically with the support plate, the guide plate and the connecting plate.

[0011] Preferably, the lower head manhole structure in the utility model is further provided with a heat insulation lining in the manhole.

[0012] Preferably, when the flange cover is not lowered, the distance between the rotating wheel mechanism and the support plate is greater than the thickness of the heat insulation lining.

[0013] Compared with the prior art, the utility model has the following beneficial effects: The lower head manhole structure in the utility model has the following improvements compared with the manhole structure in the prior art: The support plate and the guide plate are arranged on the manhole, the retaining ring in the prior art is removed, and a rotating wheel mechanism is additionally arranged on the top of the rotating shaft, when the flange cover is lowered, the rotating wheel of the rotating wheel mechanism is supported on the support plate, the rotating shaft rotates to horizontally open the flange cover, at this time, the rotating wheel moves in a circular path on the support plate with the rotating shaft as the center, therefore, the technical problem that the retaining ring and the support plate are not only severely abraded, but also difficult to rotate for workers in the prior art is avoided, after the above structural improvement, not only the labor intensity of workers is reduced, the workers are facilitated to rotate the rotating shaft, but also the service life of the manhole structure is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the lower head manhole structure in the prior art.

[0015] Figure 2 It is a structural schematic view of the lower head manhole structure in the utility model.

[0016] Figure 1 In it: 1`, lower head, 2`, manhole connecting pipe, 3`, flange, 4`, flange cover, 5`, rotating mechanism, 50`, rotating shaft, 51`, guide plate, 52`, support plate, 53`, connecting plate, 54`, retaining ring, 6`, heat insulation lining, 7`, fastener.

[0017] Figure 2 In it: 1, lower head, 10, lower head lifting lug, 2, manhole connecting pipe, 3, flange, 4, flange cover, 40, flange cover lifting lug, 5, rotating mechanism, 50, rotating shaft, 51, support plate, 52, guide plate, 53, connecting plate, 54, rotating wheel mechanism, 540, stud, 541, first rotating wheel, 542, second rotating wheel, 543, first nut, 544, second nut, 55, gasket, 6, hand-operated hoist, 7, fixing piece, 8, heat insulation lining. DETAILED DESCRIPTION

[0018] The lower head manhole structure described in the utility model is described in further detail below through specific embodiments.

[0019] Reference Figure 2As shown, a lower head manhole structure includes a manhole connecting pipe 2, a flange 3, a flange cover 4 and a turning mechanism 5 welded with the lower head 1, the flange cover 4 is uniformly distributed with three flange cover lifting lugs 40, the lower head 1 is correspondingly provided with three lower head lifting lugs 10, the flange cover lifting lug 40 and the lower head lifting lug 10 are connected by a manual hoist 6. The flange cover 4 and the flange 3 are connected by a plurality of fixing members 7, in this embodiment, the fixing member 7 is a stud and a nut.

[0020] The turning mechanism 5 includes a rotating shaft 50, a support plate 51 welded with the manhole connecting pipe 2, a guide plate 52 welded with the flange 3, a connecting plate 53 welded with the flange cover 4 and a rotating wheel mechanism 54 provided on the top of the rotating shaft 50, the support plate 51, the guide plate 52 and the connecting plate 53 are arranged in parallel, the rotating shaft 50 is arranged vertically with the support plate 51, the guide plate 52 and the connecting plate 53. The rotating shaft 50 passes through the support plate 51, the guide plate 52 and the connecting plate 53 in turn, the rotating shaft 50 is welded with the connecting plate 53, the rotating shaft 50 and the support plate 51 and the guide plate 52 form a rotatable connection, the rotating wheel mechanism 54 includes a stud 540, a first rotating wheel 541, a second rotating wheel 542, a first nut 543 and a second nut 544, the stud 540 is vertically provided in the rotating shaft 50, the first rotating wheel 541 and the first nut 543 are located on one side of the rotating shaft 50, the second rotating wheel 542 and the second nut 544 are located on the other side of the rotating shaft 50, a gasket 55 is provided above the support plate 51, the gasket 55 can prolong the service life of the support plate 51, and the support plate 51 is protected, and only the gasket 55 needs to be replaced regularly after long-term use.

[0021] The manhole is internally provided with a heat insulation lining 8, and the distance between the rotating wheel mechanism 54 and the supporting plate 51 is greater than the thickness of the heat insulation lining 8 when the flange cover 4 is not lowered, so that the heat insulation lining 8 inside the flange cover 4 can be completely dropped out of the flange 3 when the flange cover 4 is lowered, because the heat insulation lining 8 inside the flange cover 4 cannot be dropped out of the flange 3, the flange cover 4 cannot be horizontally opened. When the flange cover 4 needs to be opened, first, a plurality of fixing members 7 for fixing the flange cover 4 and the flange 3 are removed, then a worker operates the manual hoist 6 to slowly lower the flange cover 4, because the rotating shaft 50 is connected with the flange cover 4 through the connecting plate 53, so that the rotating shaft 50 is lowered along with the flange cover 4 in the process of lowering the flange cover 4, until the rotating wheel mechanism 54 at the top of the rotating shaft 50 is lowered to the position of the gasket 55 above the supporting plate 51, at this time, the flange cover 4 and the rotating shaft 50 are stopped from lowering, and the heat insulation lining 8 inside the flange cover 4 has also been completely dropped out of the flange 3, then the worker rotates the rotating shaft 50 to horizontally open the flange cover 4, in the process of rotating the rotating shaft 50, the first rotating wheel 541 and the second rotating wheel 542 of the rotating wheel mechanism 54 are supported on the gasket 55 above the supporting plate 51 and perform circumferential walking motion with the rotating shaft 50 as the center.

[0022] In summary, the lower head manhole structure in the utility model adds the rotating wheel mechanism 54, not only reduces the labor intensity of the worker, but also facilitates the rotating operation of the rotating shaft, and improves the service life of the manhole structure.

[0023] The above-mentioned embodiments only exemplarily illustrate the principle and effect of the utility model creation, and part of the applied embodiments, and are not used to limit the utility model; it should be pointed out that, for ordinary skilled in the art, without departing from the utility model creation concept, a number of deformations and improvements can be made, which all belong to the protection scope of the utility model.

Claims

1. A lower head manhole structure comprising: The manhole connecting pipe, flange, flange cover and turning mechanism welded with the lower head, characterized in that the turning mechanism comprises a rotating shaft, a support plate welded with the manhole connecting pipe, a guide plate welded with the flange, a connecting plate welded with the flange cover and a rotating wheel mechanism arranged on the top of the rotating shaft, the rotating shaft sequentially passes through the support plate, the guide plate and the connecting plate, the rotating shaft is welded with the connecting plate, the rotating shaft and the support plate and the guide plate are rotatably connected, the rotating wheel mechanism comprises a stud, a first rotating wheel, a second rotating wheel, a first nut and a second nut, the stud is vertically arranged in the rotating shaft, the first rotating wheel and the first nut are arranged on one side of the rotating shaft, the second rotating wheel and the second nut are arranged on the other side of the rotating shaft, when the flange cover is lowered, the first rotating wheel and the second rotating wheel are supported on the support plate.

2. A bottom head manhole structure as defined in claim 1, wherein: A gasket is arranged above the support plate.

3. A bottom closure manhole structure as claimed in claim 1, wherein: The flange cover is circumferentially and uniformly provided with three flange cover lifting lugs, and the lower head is correspondingly provided with three lower head lifting lugs, the flange cover lifting lug and the lower head lifting lug are connected through a manual hoist.

4. A bottom closure manhole structure as claimed in claim 1, wherein: The flange cover and the flange are connected through a plurality of fixing members.

5. A bottom closure manhole structure as claimed in claim 4, wherein: The fixing member is a stud and a nut.

6. A bottom closure manhole structure as claimed in claim 1, wherein: The support plate, the guide plate and the connecting plate are arranged in parallel, and the rotating shaft is arranged perpendicularly to the support plate, the guide plate and the connecting plate.

7. A bottom closure manhole structure as claimed in claim 1, wherein: A heat insulation lining is arranged in the manhole.

8. A bottom closure manhole structure as claimed in claim 7, wherein: When the flange cover is not lowered, the distance between the rotating wheel mechanism and the support plate is greater than the thickness of the heat insulation lining.

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