Manhole hinge structure of horizontal dehydrogenation tower

Abstract

The utility model discloses a manhole hinge structure of a horizontal dehydrogenation tower, which belongs to the technical field of pressure vessels and comprises a manhole flange, a flange cover, a rotating arm component and a hoisting component. The rotating arm assembly comprises a fixed frame, the fixed frame extends vertically, and the lower end of the fixed frame is fixedly connected with the manhole flange; the upper end of the fixed frame is rotationally connected with a supporting arm through a rotating shaft; an expansion arm is arranged on the supporting arm, and the supporting arm can rotate until the expansion arm is located above the manhole flange; the flange cover is arranged on the extension arm through the hoisting assembly and can slide in the length direction of the extension arm. In the initial stage of opening the manhole flange, the flange cover slides along the expansion arm, so that the flange cover leaves the manhole flange in the axial direction of the manhole flange; therefore, in the radial direction of the dehydrogenation tower, the flange cover is away from the dehydrogenation tower by a certain distance, and the flange cover has a rotating space to completely open the manhole flange.

Description

Technical Field

[0001] This utility model relates to the field of pressure vessel technology, specifically to a manhole hinge structure for a horizontal dehydrogenation tower. Background Technology

[0002] m-Phenylenediamine is an important fine chemical with wide applications in industrial production. It is generally produced using a catalytic hydrogenation process involving isophthalonitrile, which requires a dehydrogenation tower. Depending on equipment maintenance needs, horizontal dehydrogenation towers typically have manhole flanges, sealed with flange covers. When maintenance is required, the flange cover is opened; when the dehydrogenation tower is operating, the flange cover is used to seal the manhole flange. Existing flange covers are usually vertically hoisted. For example, invention patent CN104089008A discloses a manhole cover opening device where the manhole cover is hoisted on a crane arm and rotates away from the manhole flange as the crane arm rotates. Because the flange cover maintains a small distance from the main body of the dehydrogenation tower after rotation, conventional vertical hoisting methods encounter difficulties when opening the flange cover for manholes in special locations, such as when the main body of the dehydrogenation tower is a conical shell. The structure of the dehydrogenation tower itself can interfere with the rotation of the flange cover. To avoid this problem, the extension of the manhole flange is usually increased. This not only makes the dehydrogenation tower occupy a large production space, but also wastes materials and increases manufacturing costs. Summary of the Invention

[0003] To address the problems existing in the prior art, this utility model provides a manhole hinge structure for a horizontal dehydrogenation tower, which can effectively prevent interference between the flange cover and the main body of the dehydrogenation tower after the flange cover is opened.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a manhole hinge structure for a horizontal dehydrogenation tower, including a manhole flange, a flange cover, a rotating arm assembly, and a lifting assembly. The rotating arm assembly includes a fixed frame that extends vertically and is fixedly connected at its lower end to the manhole flange. A support arm is rotatably connected to the upper end of the fixed frame via a rotating shaft. An extension arm is provided on the support arm, which can rotate to a position above the manhole flange. The flange cover is mounted on the extension arm via the lifting assembly and can slide along the length of the extension arm. In the initial stage of opening the manhole flange, the flange cover slides along the extension arm, causing the flange cover to move away from the manhole flange axially.

[0006] In the above-mentioned manhole hinge structure of a horizontal dehydrogenation tower, the rotating shaft is fixedly connected to the support arm, and a reinforcing support rod is provided between the support arm and the rotating shaft.

[0007] In the aforementioned manhole hinge structure of a horizontal dehydrogenation tower, when the flange cover seals the manhole flange, the length direction of the extension arm is parallel to the axial direction of the manhole flange.

[0008] In the aforementioned manhole hinge structure of a horizontal dehydrogenation tower, a limiting block is provided at the free end of the extended arm.

[0009] In the aforementioned manhole hinge structure of a horizontal dehydrogenation tower, the limiting block is located at the upper part of the extension arm.

[0010] In the aforementioned manhole hinge structure of a horizontal dehydrogenation tower, the hoisting assembly includes a guide plate with a sliding channel formed within it. The extension arm passes through the sliding channel, allowing the guide plate to slide and move on the extension arm.

[0011] In the aforementioned manhole hinge structure of a horizontal dehydrogenation tower, a roller is provided in the sliding channel, and the roller is rotatably mounted on the guide plate, so that the roller makes rolling contact with the extension arm.

[0012] In the above-mentioned manhole hinge structure of a horizontal dehydrogenation tower, the roller includes a rolling sleeve, an end support sleeve, and a connecting shaft;

[0013] The connecting shaft is mounted on the guide plate;

[0014] Both the rolling sleeve and the end support sleeve are fitted onto the outside of the connecting shaft; wherein there are two end support sleeves, which are located between the two ends of the rolling sleeve and the connecting shaft, respectively, to support and limit the rolling sleeve.

[0015] In the aforementioned manhole hinge structure of a horizontal dehydrogenation tower, the hoisting assembly further includes a first connector, a connecting sleeve, and a second connector; the connecting sleeve is threadedly connected to the lower end of the first connector and the upper end of the second connector; the upper end of the first connector is connected to the guide plate; and the lower end of the second connector is connected to the flange cover.

[0016] In the above-mentioned manhole hinge structure of a horizontal dehydrogenation tower, the connecting sleeve includes a connecting part, a threaded hole is machined in the connecting part, and an operating part is provided on the outer wall of the connecting part;

[0017] And / or, a lifting ring is provided at the upper end of the flange cover, and a hook is provided at the lower end of the first connector, the hook being connected to the lifting ring.

[0018] The beneficial effects of this utility model are as follows:

[0019] The novel manhole hinge structure for special locations uses an extension arm to allow the flange cover to slide along the extension arm during the initial stage of opening the manhole flange. This causes the flange cover to move away from the manhole flange axially, and in turn, it moves a certain distance away from the dehydrogenation tower radially, ensuring that the flange cover has room to rotate and thus fully opening the manhole flange.

[0020] The technical solution of this application has a relatively simple structure and is easy to assemble. It has a wider range of applications than conventional vertical hanging cover manholes. For manholes opened on conical shells, it solves the opening problem without the need for auxiliary opening devices, and is welcomed by users in actual production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the manhole hinge structure of the horizontal dehydrogenation tower of this utility model;

[0022] Figure 2 This is a schematic diagram of the rotating arm assembly in the manhole hinge structure of the horizontal dehydrogenation tower of this utility model;

[0023] Figure 3 This is a schematic diagram of the hoisting assembly in the manhole hinge structure of the horizontal dehydrogenation tower of this utility model;

[0024] Figure 4 This is a schematic diagram of the roller structure in the manhole hinge structure of the horizontal dehydrogenation tower of this utility model;

[0025] Figure 5 This is a schematic diagram of the first connecting member in the manhole hinge structure of the horizontal dehydrogenation tower of this utility model.

[0026] Figure 6 This is a schematic diagram of the second connecting member in the manhole hinge structure of the horizontal dehydrogenation tower of this utility model.

[0027] Figure 7 This is a schematic diagram of the connecting sleeve in the manhole hinge structure of the horizontal dehydrogenation tower of this utility model;

[0028] Figure 8 This is a schematic diagram of the first state during the opening process of the manhole hinge structure of the horizontal dehydrogenation tower of this utility model;

[0029] Figure 9 This is a schematic diagram of the second state during the opening process of the manhole hinge structure of the horizontal dehydrogenation tower of this utility model.

[0030] In the picture:

[0031] 100-Manhole Flange;

[0032] 200-Flange Cover;

[0033] 300 - Swing arm assembly; 310 - Fixed frame; 320 - Connecting block; 330 - Rotating shaft; 340 - Support arm; 350 - Reinforcing support rod; 360 - Extending arm; 370 - Limit stop;

[0034] 400-Lifting assembly; 410-Guide plate; 420-Roller; 421-Rolling sleeve; 422-Connecting shaft; 423-End support sleeve; 430-Reinforcing plate; 440-First connector; 441-End limiting platform; 442-First threaded connection; 450-Connecting sleeve; 451-Connecting part; 452-Operating part; 460-Second connector; 461-Hook; 462-Second threaded connection. Detailed Implementation

[0035] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0036] Please refer to Figure 1 This invention provides an embodiment of a manhole hinge structure for a horizontal dehydrogenation tower, comprising a manhole flange 100, a flange cover 200, a swing arm assembly 300, and a lifting assembly 400. The manhole flange 100 is welded and fixed to the dehydrogenation tower, and a manhole passage for personnel to pass through is formed inside the manhole flange 100. The flange cover 200 seals the manhole passage of the manhole flange 100 when the dehydrogenation tower is in use. The swing arm assembly 300 is installed on the manhole flange 100, and the flange cover 200 is connected to the swing arm assembly 300 via the lifting assembly 400. Thus, during the opening or closing of the manhole flange 100, the swing arm assembly 300 supports the weight of the flange cover 200, reducing the labor intensity of manual operation.

[0037] To overcome the problems in the prior art, this application improves the swing arm assembly 300. Please refer to... Figure 1 , Figure 2The swing arm assembly 300 includes a fixed frame 310 that extends vertically. The lower end of the fixed frame 310 is fixedly connected to the manhole flange 100 via a connecting block 320, preferably by welding, which minimizes assembly space requirements. A rotating shaft 330 is rotatably mounted on the upper end of the fixed frame 310, and the rotating shaft 330 also extends vertically. A support arm 340 is fixedly connected to the rotating shaft 330, and the rotating shaft 330 and the support arm 340 can rotate synchronously. The support arm 340 can be an L-shaped structure or a horizontally extending rod-like structure. Preferably, a reinforcing support rod 350 is also provided between the support arm 340 and the rotating shaft 330, which increases the connection strength between the rotating shaft 330 and the support arm 340. An extension arm 360 is fixed to the support arm 340. Preferably, the extension arm 360 is located at the end of the support arm 340 away from the rotating shaft 330. When the support arm 340 rotates with the rotating shaft 330, the extension arm 360 can rotate to the top of the manhole flange 100. When the flange cover 200 is in the closed manhole flange 100 state, the length direction of the extension arm 360 can be parallel to the axial direction of the manhole flange 100, or it can have a certain angle with the axial direction of the manhole flange 100. For example, the angle between the extension arm 360 and the support arm 340 can be designed to be in the range of 60°-120°. This can ensure that when the flange cover 200 is opened, it first moves away from the manhole flange 100 by a certain distance along the extension arm 360, and then rotates the flange cover 200 to avoid the space for equipment maintenance.

[0038] Furthermore, a limiting block 370 is provided at the free end of the extension arm 360 to limit the lifting assembly 400 and prevent it from slipping off the extension arm 360 as it moves along the extension arm 360. Since the lifting assembly 400 slides in contact with the upper outer surface of the extension arm 360, the limiting block 370 is preferably located at the upper part of the extension arm 360.

[0039] like Figure 1 , Figure 3 As shown, the lifting assembly 400 includes a guide plate 410 with a sliding channel formed within it. An extension arm 360 passes through this sliding channel, allowing the guide plate 410 to slide and move along the length of the extension arm 360. Preferably, a roller 420 is provided within the sliding channel, rotatably mounted on the guide plate 410, causing the roller 420 to roll into contact with the extension arm 360, thereby reducing the resistance when the guide plate 410 and the extension arm 360 slide relative to each other. Specifically, as... Figure 3 , Figure 4As shown, the roller 420 includes a rolling sleeve 421, an end support sleeve 423, and a connecting shaft 422. Both the rolling sleeve 421 and the end support sleeve 423 are fitted onto the outside of the connecting shaft 422. There are two end support sleeves 423, located at the two ends of the rolling sleeve 421. The end support sleeves 423 are fixed to the connecting shaft 422, and the two ends of the rolling sleeve 421 are fitted onto the outside of the end support sleeves 423, making rolling contact between them. The two ends of the connecting shaft 422 are mounted on a guide plate 410 and can be limited by pins.

[0040] Preferably, the end support sleeve 423 is provided with an end baffle, and the rolling sleeve 421 is located between the end baffles of the two end support sleeves 423, thereby limiting the two ends of the rolling sleeve 421.

[0041] The hoisting assembly 400 also includes a first connector 440, a connecting sleeve 450, and a second connector 460. The lower end of the guide plate 410 has a through hole, and the first connector 440, being a round rod, passes through the through hole; as shown... Figure 3 , Figure 5 As shown, the first connector 440 has an end limiting platform 441 at its upper end and a first threaded connection portion 442 at its lower end. The end limiting platform 441 ensures that the first connector 440 does not pass through the through hole on the guide plate 410 from top to bottom, thus ensuring the connection between the first connector 440 and the guide plate 410. Preferably, a reinforcing plate 430 is fixed to the lower end of the guide plate 410 to enhance the connection strength between the first connector 440 and the guide plate 410.

[0042] like Figure 3 , Figure 6 As shown, the upper end of the second connector 460 is provided with a second threaded connection part 462, and the lower end is provided with a hook 461.

[0043] like Figure 3 , Figure 7 As shown, the connecting sleeve 450 includes a connecting part 451, which has a threaded hole. The upper end of the connecting part 451 is screwed and connected to the first threaded connecting part 442 of the first connecting member 440; the lower end of the connecting part 451 is screwed and connected to the second threaded connecting part 462.

[0044] An operating part 452 is provided on the outer wall of the connecting part 451. The operating part 452 protrudes out of the connecting part 451 and is non-cylindrical, such as hexagonal prism, so as to facilitate the application of rotational force on the connecting sleeve 450 and adjust the distance between the first connecting member 440 and the second connecting member 460.

[0045] like Figure 1-7As shown, a lifting ring is provided at the upper end of the flange cover 200 for connection with the hook 461. The lifting ring is welded and fixed to the flange cover 200. The hook 461 of the second connecting piece 460 is engaged with the lifting ring. By rotating the operating part 452 in the middle of the connecting sleeve 450, the second connecting piece 460 can be easily moved up and down, thereby realizing the vertical displacement adjustment of the flange cover 200, which is convenient for installation and disassembly.

[0046] A roller 420 is installed inside the guide plate 410, allowing movement along the length of the extension arm 360 and stopping at the limit stop 370. The support arm 340 is connected to the fixed frame 310 via a rotating shaft 330, allowing free rotation within the support arm 340. The reinforcing support rod 350 is fixed at both ends to the rotating shaft 330 and the support arm 340, respectively, and can rotate together with the support arm 340 and the rotating shaft 330. Please refer to... Figures 1-9 When the flange cover 200 needs to be opened for maintenance, in the initial stage of opening the manhole flange 100, the flange cover 200 slides along the extension arm 360, causing the flange cover 200 to move away from the manhole flange 100 axially. After the flange cover 200 and the lifting assembly 400 move synchronously along the extension arm 360 to the limit stop 370, the support arm 340 is rotated, causing the flange cover 200 to rotate and fully open the manhole passage. Because the flange cover 200 has a certain amount of radial displacement in the dehydrogenation tower body, moving away from the dehydrogenation tower body, it will no longer interfere with the dehydrogenation tower body after rotation.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A manhole hinge structure for a horizontal dehydrogenation tower, comprising a manhole flange (100), a flange cover (200), a swing arm assembly (300), and a lifting assembly (400); the swing arm assembly (300) includes a fixed frame (310), the fixed frame (310) extending vertically and its lower end fixedly connected to the manhole flange (100); characterized in that, The upper end of the fixed frame (310) is rotatably connected to a support arm (340) via a rotating shaft (330); the support arm (340) is provided with an extension arm (360), and the support arm (340) can be rotated so that the extension arm (360) is above the manhole flange (100); the flange cover (200) is set on the extension arm (360) via the lifting assembly (400) and can slide along the length direction of the extension arm (360); in the initial stage of opening the manhole flange (100), the flange cover (200) slides along the extension arm (360) so that the flange cover (200) leaves the manhole flange (100) axially.

2. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 1, characterized in that, The rotating shaft (330) is fixedly connected to the support arm (340), and a reinforcing support rod (350) is provided between the support arm (340) and the rotating shaft (330).

3. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 1, characterized in that, When the flange cover (200) seals the manhole flange (100), the length direction of the extension arm (360) is parallel to the axial direction of the manhole flange (100).

4. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 1, characterized in that, The free end of the extended arm (360) is provided with a limiting stop (370).

5. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 4, characterized in that, The limiting block (370) is located on the upper part of the extending arm (360).

6. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 1, characterized in that, The hoisting assembly (400) includes a guide plate (410) with a sliding channel formed therein. The extension arm (360) passes through the sliding channel, allowing the guide plate (410) to slide and move on the extension arm (360).

7. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 6, characterized in that, The sliding channel is provided with a roller (420), which is rotatably mounted on the guide plate (410) so that the roller (420) makes rolling contact with the extension arm (360).

8. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 7, characterized in that, The roller (420) includes a rolling sleeve (421), an end support sleeve (423), and a connecting shaft (422). The connecting shaft (422) is mounted on the guide plate (410); The rolling sleeve (421) and the end support sleeve (423) are both fitted on the outside of the connecting shaft (422); wherein there are two end support sleeves (423), which are located between the two ends of the rolling sleeve (421) and the connecting shaft (422) respectively, to support and limit the rolling sleeve (421).

9. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 6, characterized in that, The hoisting assembly (400) further includes a first connector (440), a connecting sleeve (450), and a second connector (460); the connecting sleeve (450) is threadedly connected to the lower end of the first connector (440) and the upper end of the second connector (460); the upper end of the first connector (440) is connected to the guide plate (410); and the lower end of the second connector (460) is connected to the flange cover (200).

10. The manhole hinge structure of a horizontal dehydrogenation tower according to claim 9, characterized in that, The connecting sleeve (450) includes a connecting part (451), a threaded hole is machined in the connecting part (451), and an operating part (452) is provided on the outer wall of the connecting part (451). And / or, the upper end of the flange cover (200) is provided with a lifting ring, and the lower end of the first connector (440) is provided with a hook (461), the hook (461) being connected to the lifting ring.

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