Safety platform suitable for being installed in air duct

Abstract

A safety platform suitable for being installed in an air duct is characterized in that a manhole is formed in the bulkhead of the air duct, the air duct is arranged on one side of the manhole, an external deck is arranged on the other side of the manhole, a square grating plate is arranged on the side, located in the air duct, of the manhole, a manhole cover is fixed to the grating plate, and the manhole cover corresponds to the manhole in position and is matched with the manhole; the bottom of the grating plate is movably connected with the bulkhead through a shaft, shaft sleeves are fixed to the two ends of the shaft and fixed to the bulkhead, the grating plate is wider than the manhole, a seat ring is fixed to the side, located on the air duct, of the manhole and along the circumferential edge of the manhole, a circle of bolt holes are formed in the circumferential direction of the seat ring, and the bolt holes formed in the seat ring correspond to the bolt holes formed in the circumferential direction of the manhole. And bolts penetrate through the bolt holes from one side of the deck outside the manhole to fix the manhole cover on the manhole. The ventilation capacity is not interfered by the platform, the technology is advanced, the conception is ingenious, the manufacturing difficulty is low, the installation is simple, and the technical advantages are particularly obvious.

Description

Technical Field

[0001] This invention belongs to the field of marine vessel ventilation system design and construction, specifically relating to a safety platform suitable for installation inside a ventilation duct. Background Technology

[0002] Shipboard ventilation systems utilize numerous structural air ducts. These ducts are typically very large, usually square, ranging from 1 to 3 meters in length and width, and exceeding 10 meters in height. Their function is to exhaust stale air from the engine room to the outside and to bring in clean outdoor air. This provides fresh air for personnel and cools the equipment within the engine room. For maintenance and ease of construction, the ducts require ladders and manholes for access from various platforms. However, too many outfitting components cannot be installed within the ducts, as this would affect airflow and speed. Therefore, the design of these maintenance access routes requires careful consideration.

[0003] In the past, most ships only installed straight ladders in their structural ventilation ducts to minimize the impact on wind speed and volume. However, providing only straight ladders is insufficient for personnel safety. For excessively tall straight ladders, it is recommended to add buffer platforms, especially for manhole access passages. Otherwise, entering the ventilation duct through the manhole would require climbing the straight ladder directly, which is extremely dangerous. However, finding a way to add a safe platform without compromising ventilation remains a challenge. Summary of the Invention

[0004] To address the above problems, this invention proposes a safety platform suitable for installation within air ducts, the technical solution of which is as follows:

[0005] A safety platform suitable for installation inside a wind duct is provided. A manhole is provided on the wind duct wall. One side of the manhole is the wind duct, and the other side is the external deck. A square grating plate is provided on the side of the manhole located inside the wind duct. A manhole cover is fixed on the grating plate. The thickness of the grating plate at the manhole cover is less than the thickness of the grating plate in other places. The position of the manhole cover corresponds to the manhole and is adapted to the manhole.

[0006] The bottom of the grating is movably connected to the bulkhead via a shaft. Both ends of the shaft are fixed with bushings, which are fixed to the bulkhead. The width of the grating is greater than the width of the manhole. On the side of the manhole located in the air duct, a seat ring is fixed along the circumferential edge of the manhole. A ring of bolt holes is provided along the circumference of the seat ring. The bolt holes on the seat ring correspond to the bolt holes provided around the manhole. Bolts pass through the bolt holes from the outer deck side of the manhole to fix the manhole cover to the manhole.

[0007] Furthermore, the aforementioned safety platform suitable for installation inside air ducts has a manhole size of 400mm × 600mm and a manhole height of 600mm from the ground.

[0008] Furthermore, the aforementioned safety platform suitable for installation inside the air duct has a support rod fixed below the bushing, with the end of the support rod fixed to the bulkhead. When the grating plate is laid flat, the other end of the support rod contacts the grating plate.

[0009] Furthermore, the aforementioned safety platform suitable for installation inside air ducts is further provided with a handle on the upper part of the manhole cover. The handle cooperates with a hook rod, which is used to open and close the manhole cover.

[0010] Furthermore, the aforementioned safety platform suitable for installation inside air ducts has a sealing gasket bonded to the outer surface of the seat ring.

[0011] Furthermore, in the aforementioned safety platform suitable for installation within an air duct, the support rod is located below the bushing, and the bushing and support rod are connected to the bulkhead via a pad.

[0012] This invention changes the manhole cover from an outward-opening design to an inward-opening design, embedding it within the grille walkway. When personnel enter the air duct, the foldable safety platform remains in the unfolded state; conversely, when personnel leave the air duct and the manhole cover needs to be closed, the platform is strictly folded, ensuring that ventilation capacity is not interfered with by the platform. This invention is technologically advanced, ingeniously conceived, easy to manufacture, and simple to install, exhibiting particularly significant technical advantages. Attached Figure Description

[0013] Figure 1 A schematic diagram of the manhole cover when closed;

[0014] Figure 2 A side view of the manhole cover when it is open;

[0015] Figure 3 A side view of the manhole cover when closed;

[0016] Figure 4 This is a schematic diagram showing the actual installation location of the present invention in a structural air duct;

[0017] Figure 5 A schematic diagram showing the use of iron chains to open and close manhole covers;

[0018] Among them, 1-deck, 2-bulls, 4-bolts, 5-seat ring, 6-manhole, 8-manhole cover, 10-handle, 11-grating plate, 12-shaft, 13-shaft sleeve, 14-support rod, 15-pad plate, 19-hook rod. Detailed Implementation

[0019] The invention will be further described with reference to the accompanying drawings. Example

[0020] like Figure 1 , 2As shown in Figures 1 and 3, the left side of bulkhead 2 is the interior of the air duct, and the right side is the deck 1. Conventionally, manhole covers are placed on the right side of bulkhead 2, but as shown in Figure AA, this invention places the manhole cover 8 on the left side of bulkhead 2, that is, inside the structural air duct, which can also be accessed from... Figure 4 The installation location of the invention can be seen more intuitively.

[0021] The present invention requires a manhole 6 to be made on the bulkhead 2. The manhole 6 is an elliptical structure with a typical opening size of 400mm x 600mm, with the long side in the vertical direction. The bottom of the opening is about 600mm above the deck 1, which is a suitable height for personnel to enter and exit.

[0022] A ring of evenly spaced bulkhead bolt holes needs to be drilled around manhole 6, with a diameter approximately 2mm to 4mm larger than that of bolt 4. Seat ring 5 is located on the left side of bulkhead 2, inside the structural air duct, welded to the left side of bulkhead 2. Seat ring 5 also has a ring of evenly spaced seat ring bolt holes 1, identical in number and diameter to the bulkhead bolt holes, and perfectly aligned. From... Figure 1 AA view and Figure 2 As can be seen from the DD view, bolt 4 needs to pass through the bulkhead bolt hole and seat ring bolt hole 1, and be tightened onto the manhole cover bolt hole to fix the manhole cover 8 onto the seat ring 5.

[0023] To ensure a tight seal, a gasket is placed between the manhole cover 8 and the seat ring 5. The gasket has the same dimensions as the seat ring 5 and serves as the seal. For ease of installation, the gasket is adhered to the seat ring 5, ensuring it will not fall off after the manhole cover 8 is opened.

[0024] The manhole cover 8 is oval-shaped, with an outer ring size identical to the seat ring 5. To reduce weight, the central area of ​​the manhole cover uses a thinner plate, approximately 6-8mm thick. A handle 10 is installed near the top center for opening and closing. The handle 10 is recessed, flush with the right side of the manhole cover 8, with the handle guard recessed to the left of the manhole cover 8. This design ensures a flat front surface when the manhole cover is open, preventing tripping over the handle. Figure 2 The DD view is shown.

[0025] like Figure 1 As shown in the B-direction view, the manhole cover 8 is integrated with the grille plate 11. When opened, the front of the manhole cover 8, together with the grille plate 11, forms a safety platform. Figure 2 The DD view is shown.

[0026] The grille plate 11 uses a rotating shaft opening mechanism, as shown in the diagram. From Figure 1 and Figure 2Its detailed structure can be seen. The grating plate 11 is welded to the shaft 12, and the two sides of the shaft 11 are respectively inserted into the bushing 1 and can rotate around the bushing 1, ensuring that when closed, the manhole cover 8 can seal with the seat ring 5. When opened, it can be rotated to a horizontal position, presenting a safety platform state.

[0027] To ensure that the grating plate 11 remains stable in a horizontal position after opening, a support rod 14 needs to be installed below the grating plate 11, as shown in the figure. Figure 2 As shown in the DD view. Two support rods 14 need to be installed, one on each side of the grating plate 11, and it is necessary to ensure that the support rods are on the grating plate 11.

[0028] The support rod 14 and the bushing 1 share the same pad 15, with two sets of each, located on both sides of the grating plate 11. This ensures the accuracy of installation and avoids errors.

[0029] like Figure 4 As shown, when closing the manhole cover, personnel can stand outside the manhole 6, i.e., on the deck 1, and use the hook rod 1 to pass through the manhole 6 and hook it onto the manhole cover handle 10. This allows them to pull up the grating plate 11 and close the manhole cover 8. Then, bolts 4 are passed through the manhole cover bolt holes and seat ring bolt holes 1 and screwed onto the manhole cover bolt holes to tighten and fix the cover, thus completing the operation.

[0030] When opening, loosen bolt 4, and the grating plate 11 opens to the left by gravity, along with the manhole cover 8. It can also be slowly released using hook rod 1 to avoid impact.

[0031] After entering the structural ventilation duct, personnel can step onto the safety platform of this invention and then climb the straight ladder, which greatly increases the safety level of personnel.

[0032] like Figure 5 As shown, both the manhole cover seat 5 and the manhole cover 8 are installed on the right side of the bulkhead 2, which is the outer side of the structural air duct, which is a conventional installation method for manhole covers. However, in order to ensure the safe deployment and retraction of the platform, an iron chain is welded to the top of the grating plate 11, and a hook is welded to the left side of the bulkhead 2, which is inside the structural air duct, near the upper part of the manhole cover.

[0033] When entering the structural air duct, the iron chain is loosened, the grating plate 11 is lowered and placed on the support 14 in a horizontal position, and then the structural air duct can be entered through the manhole 6.

[0034] After leaving the structural air duct, pull the chain to lift the grating panel 11. Once it is lifted into a vertical position, hang the chain on the hook, selecting the appropriate chain rings as needed. The grating panel 11 is then fixed in place, minimizing any impact on ventilation.

[0035] This design also ensures that the safety platform is open before personnel enter the structural air duct, guaranteeing personnel safety. Even if personnel forget to retract the grille panel 11 when leaving, the grille panel's design has minimal impact on ventilation, so overall it won't cause a significant problem.

Claims

1. A safety platform suitable for installation inside an air duct, characterized in that, Manholes are provided on the bulkhead of the air duct. One side of the manhole is the air duct, and the other side is the outer deck. A square grating plate is provided on the side of the manhole located inside the air duct. A manhole cover is fixed on the grating plate. The thickness of the grating plate at the manhole cover is less than the thickness of the grating plate in other places. The position of the manhole cover corresponds to the manhole and is adapted to the manhole. The bottom of the grating is movably connected to the bulkhead via a shaft. Both ends of the shaft are fixed with bushings, which are fixed to the bulkhead. The width of the grating is greater than the width of the manhole. On the side of the manhole located in the air duct, a seat ring is fixed along the circumferential edge of the manhole. A ring of bolt holes is provided along the circumference of the seat ring. The bolt holes on the seat ring correspond to the bolt holes provided around the manhole. Bolts pass through the bolt holes from the outer deck side of the manhole to fix the manhole cover to the manhole.

2. A safety platform suitable for installation in an air duct according to claim 1, characterized in that, The manhole measures 400mm x 600mm and is 600mm above the ground.

3. A safety platform suitable for installation in an air duct according to claim 1, characterized in that, A support rod is fixed below the bushing, and the end of the support rod is fixed to the bulkhead. When the grating plate is flat, the other end of the support rod contacts the grating plate.

4. A safety platform suitable for installation in an air duct according to claim 1, characterized in that, The manhole cover is equipped with a handle on the top, which works in conjunction with a hook rod to open and close the manhole cover.

5. A safety platform suitable for installation in an air duct according to claim 1, characterized in that, A sealing gasket is bonded to the outer surface of the seat ring.

6. A safety platform suitable for installation in an air duct according to claim 3, characterized in that, The support rod is located below the bushing, and the bushing and support rod are connected to the bulkhead through a pad.

Images