A cable box for a hazardous area of a ship and a threading method thereof

Abstract

The application provides a ship dangerous area cable box, which comprises a mounting seat, the mounting seat comprises a back plate connected with a bulkhead, two parallel side plates are vertically arranged on the back plate, and a reinforcing structure is arranged on the top of the mounting seat; and an explosion-proof box body, the explosion-proof box body comprises a rectangular box structure, two opposite side faces of the explosion-proof box body are fixedly connected with the two side plates of the mounting seat, and threading holes are formed in the two side faces of the explosion-proof box body connected with the mounting seat. The application solves the cable pulling and laying problem of a special cabin under the premise that the cabin space of a ship is limited, greatly improves the implementability of the non-essential safety cable pulling and laying work with a large number and a complex type, reduces the complexity of cable pipe threading, greatly reduces the construction difficulty and the workload of workers, and also makes the later maintenance simple and easy to operate, reduces a large amount of material investment and personnel investment.

Description

Technical Field

[0001] This invention belongs to the field of ship design technology, and specifically relates to a cable box for dangerous areas of a ship and a method for wiring the cable thereon. Background Technology

[0002] Existing cable boxes are mainly used in coal mines, petrochemicals, fire protection and other fields. They are mainly for the physical isolation and operation of equipment and hazardous areas, and do not cover solutions for laying non-intrinsically safe cables in hazardous areas.

[0003] Currently, the shipbuilding industry mainly uses double-walled pipes and matching ventilation systems as solutions for cable laying in explosion-proof areas.

[0004] Double-walled pipe systems achieve isolation between the inner pipe and the environment through ventilation in the interlayer of the double-layered pipes. When the number of cables in the explosion-proof area is large or there are multiple types of cables that need to be laid separately (there are relevant process requirements when laying cables with different sensitivities), the piping structure of the double-walled pipe system will be complex and large. The difficulty of production, space occupation, sealing, installation and maintenance will all increase exponentially. At the same time, the design difficulty and the aesthetics of the compartment will also be significantly affected.

[0005] The "one cable, one conduit" method is only suitable for situations with a small number of cables or large compartments due to the standard distance between conduits. When the number of cables is large and the available space for running them through conduits is very limited, there may be insufficient space or even be no way to carry out the work.

[0006] In summary, existing technologies are resource-intensive, have complex and unattractive structures, require technical support, are uneconomical, increase design difficulty, and cannot effectively facilitate the convergence and redistribution of a large number of cables in the same hazardous area on ships. Summary of the Invention

[0007] To address the problems existing in the prior art, a cable box for hazardous areas of ships is proposed. The cable box for hazardous areas of ships includes: The mounting base includes a back plate connected to the bulkhead, two parallel side plates vertically arranged on the back plate, and a reinforcing structure on the top of the mounting base; An explosion-proof enclosure, comprising a rectangular enclosure structure, wherein two opposite sides of the explosion-proof enclosure are fixedly connected to two side plates of the mounting base, and wire through holes are provided on the two sides of the explosion-proof enclosure connected to the mounting base.

[0008] Furthermore, an inspection port is provided on the bottom surface of the explosion-proof enclosure.

[0009] Furthermore, the bottom surface of the explosion-proof enclosure is provided with a seat ring arranged around the inspection port, and several studs are vertically arranged on the seat ring.

[0010] Furthermore, the internal dimensions of the seat ring are larger than the inspection port, ensuring a 5-10mm gap between the inner edge of the seat ring and the inspection port.

[0011] Furthermore, it also includes a cover plate that matches the inspection port, and the cover plate has a through hole that mates with the stud.

[0012] Furthermore, a sealing strip is provided between the cover plate and the seat ring. The sealing strip has the same shape as the seat ring and is pre-drilled according to the position of the stud.

[0013] Furthermore, the explosion-proof enclosure, the cover plate, and the seat ring are all made of 6mm thick steel plate.

[0014] A wiring method for cable boxes in hazardous areas of ships, as described above, includes the following steps: Collect statistics on the specifications, quantity, and type of all cables that need to pass through this hazardous area; Before cables enter the explosion-proof area, the cable route should be planned first. Cables with large sections of the same route should be gathered together, entered into the cable box through the flange, and then run through a single large pipe. In areas with a large number of devices, explosion-proof cable boxes are installed again, and the cables are run through the conduits to the equipment ends, starting from the cable boxes. The cable conduit and equipment are finally connected via a flexible cable hose to ensure the airtightness of the entire line.

[0015] Furthermore, cable boxes are connected to each other via flanges and cable conduits. The specifications of the cable conduits are calculated based on the specifications and quantity of the cables that need to be passed through. Typically, the main conduit in the initial cable box is the largest, and the main conduits in subsequent cable boxes decrease progressively.

[0016] The design method for cable boxes in hazardous areas of ships provided by this invention has the following advantages over existing technologies: This invention solves the problem of cable laying in special compartments under the premise of limited space in ship cabins, greatly improving the feasibility of laying a large number and variety of non-intrinsically safe cables; it reduces the complexity of cable conduit installation, greatly reduces construction difficulty and the workload of workers; at the same time, it makes subsequent maintenance simple and easy to operate, reducing a lot of material and personnel input. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cable path of the present invention; Figure 2 This is a schematic diagram (front view) of the cable box conduit installation according to the present invention. Figure 3 This is a schematic diagram (perspective view) of the cable box conduit installation of the present invention (II). Figure 4 This is a schematic diagram of the cable box structure of the present invention; Figure 5 This is a schematic diagram of the cable box mounting base of the present invention; Figure 6 This is a schematic diagram of the installation of the cable box and mounting base of the present invention; Figure 7 This is a schematic diagram of the welding of the seat ring stud of the present invention; Figure 8 This is a schematic diagram showing the relationship between the seat ring and the access port of the present invention; Figure 9 Comparison of cable box installation before and after using this invention (before use); Figure 10 Comparison of cable box before and after installation in conduit for this invention (after use). Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] This application proposes a cable box for hazardous areas of a ship and a wiring method thereof, referring to... Figures 1-3 The wiring method of the cable box in the dangerous area of ​​the ship is as follows ( Figure 1 The large rectangular box represents the cable box; the other items in magenta represent electrical equipment; and the green area represents the cable route. Collect statistics on the specifications, quantity, and type of all cables that need to pass through this hazardous area; Before cables enter the explosion-proof area, the cable route should be planned first. Cables with large sections of the same route should be gathered together, entered into the cable box through the flange, and then run through a single large pipe. In areas with a large number of devices, explosion-proof cable boxes are installed again, and the cables are run through the conduits to the equipment ends, starting from the cable boxes. Cable boxes are connected to each other via flanges and cable conduits. The specifications of the cable conduits are calculated based on the specifications and quantity of the cables to be passed through. Typically, the main conduit in the first cable box is the largest, and the main conduits in subsequent cable boxes decrease progressively. The cable conduit and equipment are finally connected via a flexible cable hose to ensure the airtightness of the entire line.

[0020] Composition, material selection, and process requirements of cable boxes in hazardous areas of ships Combination Figures 4-6 The cable box in this hazardous area mainly consists of two parts: the box body and the conduit.

[0021] The enclosure includes: an explosion-proof enclosure, a mounting ring, a cover plate, and sealing strips. Because the cable box enclosure requires double-sided welding, and the enclosure and cover plate must not undergo excessive deformation during the welding process, sufficient space must be provided for the access panel to ensure the enclosure's functionality and airtightness. A minimum access panel size of 400*500 mm is recommended. The enclosure surface should be smooth, free of burrs, cracks, and sharp edges should be rounded.

[0022] The mounting base for installing the explosion-proof enclosure includes a back plate connected to the bulkhead. The back plate is fixed to the vertical bulkhead of the ship's cabin, and two parallel side plates are vertically provided on the back plate. The top of the mounting base is provided with a reinforcing structure, and the two side plates are formed into an arc-shaped structure that transitions from the top surface of the mounting base to the plane of the back plate.

[0023] The main structure of the enclosure is rectangular. Two opposite side edges of the explosion-proof enclosure are formed into arcs that match the side panels of the mounting base. After wire holes are opened on the two arc-shaped side panels, they are fixedly connected to the two side panels of the mounting base.

[0024] The seat ring needs to be pre-drilled, the studs welded on, and the welded surface ground smooth (see...). Figure 7 The inner diameter of the seat ring must be larger than the inspection port at the bottom of the housing, ensuring a 5-10mm welding allowance on each side (see...). Figure 8 The seat ring is welded using full welding. During welding, pay attention to the welding sequence and welding current to avoid deformation.

[0025] The cable box cover should be designed to ensure the screw holes are positioned accurately; otherwise, it will not fit.

[0026] The enclosure, cover, and seat ring used by our company are all made of 6mm thick steel plate.

[0027] The sealing strip is made of neoprene rubber, 5mm thick, and its shape must match that of the seat ring. Holes should be pre-drilled according to the positions of the seat ring studs, and the strip should be placed between the cover plate and the seat ring to ensure the cable box is airtight.

[0028] The piping components include flanges, stuffing boxes, pipes, and explosion-proof cable hoses. The selection should be based on the actual cable model, specifications, and quantity, and in accordance with process requirements. Our company's process requirements stipulate that the cross-sectional area of ​​the cable in the conduit must be less than or equal to 0.3 times the cross-sectional area of ​​the inner diameter of the cable conduit.

[0029] contrast Figure 9 and Figure 10By using this type of cable box for hazardous areas on ships, the problem of cable laying in special compartments with limited space has been solved, significantly improving the feasibility of laying a large number and variety of non-intrinsically safe cables. It reduces the complexity of cable conduit installation, greatly decreasing construction difficulty and worker workload. This ensures the smooth, high-quality, and aesthetically pleasing completion of the company's production tasks, while also simplifying subsequent maintenance. It also significantly reduces the need for substantial material and personnel input.

[0030] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification are within the scope of the present invention.

Claims

1. A cable box for hazardous areas of a ship, characterized in that, include: The mounting base includes a back plate connected to the bulkhead, two parallel side plates vertically arranged on the back plate, and a reinforcing structure on the top of the mounting base; An explosion-proof enclosure, comprising a rectangular enclosure structure, wherein two opposite sides of the explosion-proof enclosure are fixedly connected to two side plates of the mounting base, and wire through holes are provided on the two sides of the explosion-proof enclosure connected to the mounting base.

2. The cable box according to claim 1, characterized in that: The bottom surface of the explosion-proof enclosure has an inspection port.

3. The cable box according to claim 2, characterized in that: The bottom surface of the explosion-proof enclosure is provided with a seat ring arranged around the inspection port, and several studs are vertically arranged on the seat ring.

4. The cable box according to claim 3, characterized in that: The internal dimensions of the seat ring are larger than the inspection port, ensuring a 5-10mm gap between the inner edge of the seat ring and the inspection port.

5. The cable box according to claim 4, characterized in that: It also includes a cover plate that matches the inspection port, and the cover plate has a through hole that mates with the stud.

6. The cable box according to claim 5, characterized in that: A sealing strip is provided between the cover plate and the seat ring. The sealing strip has the same shape as the seat ring and is pre-drilled according to the position of the stud.

7. The cable box according to claim 6, characterized in that: The explosion-proof enclosure, the cover plate, and the seat ring are all made of 6mm thick steel plate.

8. A method for threading cables through a cable box in a hazardous area of ​​a ship as described in claims 1-7, characterized in that, Includes the following steps: Collect statistics on the specifications, quantity, and type of all cables that need to pass through this hazardous area; Before cables enter the explosion-proof area, the cable route should be planned first. Cables with large sections of the same route should be gathered together, entered into the cable box through the flange, and then run through a single large pipe. In areas with a large number of devices, explosion-proof cable boxes are installed again, and the cables are run through the conduits to the equipment ends, starting from the cable boxes. The cable conduit and equipment are finally connected via a flexible cable hose to ensure the airtightness of the entire line.

9. The method according to claim 8, characterized in that: Cable boxes are connected to each other via flanges and cable conduits. The specifications of the cable conduits are calculated based on the specifications and quantity of the cables to be passed through. Typically, the main conduit in the first cable box is the largest, and the main conduits in subsequent cable boxes decrease progressively.

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