Waterproof standard magnetic compass base and mounting method thereof

Abstract

The waterproof standard magnetic compass base comprises a base plate, the center of the base plate is open, the base plate is fixedly connected to a compass deck, a round pipe is arranged on the upper end face of the base plate, a lower side pipe opening of the round pipe is welded to the base plate, a panel is welded to an upper side pipe opening of the round pipe, the center of the panel is open, and the panel penetrates into the round pipe. Gaskets are arranged on the upper end surfaces of the panels; a water retaining ring is welded to the upper end face of the panel, and the outer wall of the water retaining ring is tightly attached to the inner wall of the gasket; the inner diameter of the panel is smaller than the inner wall diameter of the standard magnetic compass. The base is composed of all parts made of durable materials, the structure is simple, the durability is greatly improved, the replacement frequency of a hardwood pad can be remarkably reduced, the overall service life is prolonged, and the labor and material cost for maintenance is reduced; meanwhile, the formed multiple waterproof structures are used for mounting the compass, water is effectively prevented from permeating from the base, and the risk that components in the compass are damaged due to the tightness problem is reduced.

Description

Technical Field

[0001] This invention relates to the field of ship design and construction technology, and in particular to a waterproof standard magnetic compass base and its installation method. Background Technology

[0002] A standard magnetic compass is an indispensable navigational device on modern ships. As required, it is primarily installed amidships (centerline), with its heading baseline indicating the ship's heading, and an accuracy of ±0.5°. Magnetic compasses come in two forms: benchtop and vertical. Vertical standard magnetic compasses are generally installed on open decks, reliably fixed to washers or supports nailed to the deck using non-magnetic bolts. These supports are typically bases welded to the deck.

[0003] Traditional gaskets are generally made of hardwood. Although protected by waterproof covers, the physical properties of hardwood gaskets mean they are susceptible to corrosion and cracking when placed on open decks. This can affect the watertightness of the connection between the magnetic compass and the hull, potentially damaging the internal components of the magnetic compass. Therefore, frequent gasket replacements are necessary, causing inconvenience for maritime operations. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a waterproof standard magnetic compass base and its installation method, which can reduce the frequency of gasket replacement and lower the risk of damage to the internal components of the standard magnetic compass due to water tightness issues.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A waterproof standard magnetic compass base includes a pad with a central opening and fixed to a compass plate by bolts. A circular tube is provided on the upper end face of the pad, and the lower end of the circular tube is sealed and welded to the pad. A panel is sealed and welded to the upper end of the circular tube, with a central opening extending into the circular tube. A gasket is provided on the upper end face of the panel.

[0007] In a preferred embodiment, waterproof rings are provided on both the upper and lower end faces of the gasket, and a water-blocking ring is sealed and welded to the upper end face of the panel. The outer wall of the water-blocking ring is tightly attached to the inner wall of the gasket. The inner diameter of the panel is smaller than the inner wall diameter of the standard magnetic compass to facilitate the installation of the water-blocking ring.

[0008] In a preferred embodiment, an elbow plate is provided between the panel and the pad. The elbow plate is welded and fixed to the lower end face of the panel, the outer periphery of the circular tube and the upper end face of the pad, respectively. The number of elbow plates is set to multiple and distributed at intervals along the circumference of the circular tube.

[0009] In a preferred embodiment, the outer diameter of the pad is larger than the outer diameter of the panel, and the thickness of the pad is not less than the thickness of the compass plate; the outer diameter of the panel is larger than the outer diameter of the mounting panel of the standard magnetic compass; and the inner diameter of the circular tube is larger than the opening diameter of the pad.

[0010] In a preferred embodiment, the circular tube is selected from a cylinder or a seamless steel pipe rolled from a non-magnetic steel plate.

[0011] In a preferred embodiment, the washer is made of hardwood or other non-magnetic materials.

[0012] In a preferred embodiment, the bolt is a non-magnetic bolt, preferably a copper bolt or a brass bolt.

[0013] Another object of the present invention is to provide a method for installing a waterproof standard magnetic compass base, comprising the following steps:

[0014] Step a. According to the installation requirements of the standard magnetic compass, first mark the centerline at the front of the ship, and make a circular hole on the compass deck with any point on the centerline as the center.

[0015] Step b. Align the center opening of the pad with the opening of the compass deck, drill a positioning hole for the compass deck through the through hole in the pad, after drilling, apply a layer of non-magnetic sealant between the compass deck and the base plate, and apply anti-rust primer and topcoat to the through hole, and then fix the two with non-magnetic bolts.

[0016] Step c. Align the center of the round tube with the center of the pad, and use non-magnetic welding wire to seal the joint between the round tube and the pad.

[0017] Step d. Align the panel with the center of the tube and use non-magnetic welding wire to seal the joint between the panel and the tube.

[0018] Step e. Mark the welding positions of the elbow plate along the outer circumference of the round tube, and use non-magnetic welding wire to weld the same elbow plate to the pad, round tube and panel one by one.

[0019] Step f. Align the water-retaining ring with the center of the panel and use non-magnetic welding wire to seal and weld the joint between the water-retaining ring and the panel.

[0020] Step g. Stack the lower waterproof ring, gasket, and upper waterproof ring in sequence from bottom to top, aligning them with the center of the panel to complete the assembly of the waterproof standard magnetic compass base.

[0021] By adopting the above technical solution, the present invention has the following beneficial effects:

[0022] 1. The waterproof standard magnetic compass base provided by this invention comprises conventional components such as a pad, a round tube, a panel, a washer, a waterproof ring, and a water-retaining ring. Its simple structure, compared to traditional hardwood pad bases, replaces easily worn hardwood pads with durable materials, significantly improving durability and reducing the frequency of hardwood pad replacements, thereby lowering maintenance labor and material costs and extending overall service life. Furthermore, the multiple waterproof designs formed by the water-retaining ring, washer, and waterproof ring effectively prevent water infiltration, greatly reducing the risk of damage to internal components of the standard magnetic compass due to airtightness issues, and ensuring long-term stable operation of the equipment in complex environments such as water exposure and humidity.

[0023] 2. The installation method of the waterproof standard magnetic compass base provided by another aspect of the present invention fixes the base to the deck using only mature processes such as bolt fixing and sealing welding, without the need for complex processing equipment and special technology, making manufacturing and installation convenient and efficient. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is an installation schematic diagram of Embodiment 1 of the present invention (viewed from above on the compass deck).

[0026] Figure 2 This is the present invention. Figure 1 Sectional view at point AA.

[0027] Figure 3 This is an installation schematic diagram of Embodiment 2 of the present invention (viewed from above on the compass deck).

[0028] Figure 4 This is the present invention. Figure 3 Sectional view at BB.

[0029] Attached reference numerals: 1. Pad plate; 2. Round tube; 3. Panel; 4. Washer; 5. Waterproof ring; 6. Water-retaining ring; 7. Elbow plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The connection between the mounting panel and the base of a standard magnetic compass requires gaskets for magnetic isolation and demagnetization. These gaskets must be made of non-magnetic materials, typically hardwood. However, hardwood gaskets are susceptible to corrosion and cracking, which can compromise the watertightness of the connection between the magnetic compass and the hull, potentially damaging internal components. Therefore, improvements to the base design must address the waterproofing issues within the standard magnetic compass and upgrade the gasket material. Ideally, the gasket material should be easy to process and inexpensive.

[0032] Example 1

[0033] Based on this, the present invention proposes a waterproof standard magnetic compass base, see [link to relevant documentation]. Figures 1-2 (The figure shows some structural dimensions in mm.) It includes a pad 1, which is a circular plate with a central opening. Pad 1 must be made of demagnetizing steel and has multiple through holes arranged around it. The opening position of the compass deck is located on the ship's longitudinal centerline (center line), and the selected position must provide a 360° unobstructed horizontal view and ensure that there are no magnetic interference sources within at least one circle. The position and size of the central opening of pad 1 should correspond to the opening of the compass deck, and through holes should be correspondingly provided on the compass deck at the locations of the through holes in pad 1. Before fixing, the holes must be treated for rust and water resistance, and a layer of non-magnetic sealant (such as polysulfide sealant) should be applied between the compass deck and pad 1. Then, pad 1 and the compass deck are fixed with bolts. The bolts used must be non-magnetic (usually copper or brass bolts).

[0034] A circular tube 2 is provided on the upper end face of the base plate 1. The circular tube 2 should be a cylinder rolled from a demagnetized steel plate or a seamless steel pipe. The outer circumference of the lower end face of the circular tube 2 is sealed and fixedly connected to the base plate 1 by welding. The inner diameter of the circular tube 2 is slightly larger than the opening diameter of the base plate 1, so that the base plate 1 provides support for the circular tube 2. A panel 3 is provided on the upper end face of the circular tube 2. The panel 3 is used to connect with the standard magnetic compass. The panel 3 is a circular plate structure with a central opening. The diameter of the opening is slightly smaller than the inner diameter of the circular tube 2, so that the circular tube 2 can provide support for the panel 3. The contact position between the panel 3 and the outer circumference of the circular tube 2 is also sealed and fixedly connected by welding. Both of the above-mentioned welds are performed using non-magnetic ER307Si pure austenitic stainless steel welding wire to avoid the influence of welding materials on the standard magnetic compass.

[0035] A gasket is typically placed at the connection between a standard magnetic compass and its base because standard magnetic compasses are highly sensitive to any surrounding ferromagnetic materials. Ships, being steel structures, generate a fixed magnetic field that can interfere with the compass reading. The added gasket must be made of a non-magnetic material, physically separating the compass mount from the steel deck or mounting platform, minimizing magnetic interference from the underlying ship structure.

[0036] Based on this, a washer 4 is provided on the upper surface of panel 3. The washer 4 has a circular plate structure, and its inner and outer diameters are the same as those of panel 3. When connected with a standard magnetic compass, it can play the roles of magnetic isolation and demagnetization, seawater isolation, leveling, and vibration reduction.

[0037] Traditionally, washers are made of hardwood, but hardwood washers are prone to corrosion and cracking over time, allowing seawater to seep into the magnetic compass. Washers are consumable materials; therefore, the selection criteria for washer materials should follow the principles of ease of processing and low cost.

[0038] Table 1 lists the non-magnetic materials available for washers.

[0039]

[0040] Among them, austenitic stainless steel must pass magnetic testing, and marine plywood must be free of any metal impurities or fasteners.

[0041] See Figure 2 To ensure the base can stably support the standard magnetic compass, multiple elbow plates 6 are provided at the junction between the outer wall of the circular tube 2, the panel 3, and the pad 1. These elbow plates 6 are spaced apart circumferentially along the circular tube 2. Each elbow plate 6 is simultaneously welded and fixed to the lower end face of the panel 3, the outer ring of the circular tube 2, and the upper end face of the pad 1, thereby providing sufficient support for the base.

[0042] As the lowest part of the base, the pad 1 bears the greatest pressure. Therefore, the outer diameter of the pad 1 must be greater than the outer diameter of the panel 3, and the thickness of the pad 1 should not be less than the thickness of the compass plate to increase the strength and stability of the base.

[0043] Panel 3 is the part that directly connects to the standard magnetic compass and directly bears the weight of the standard magnetic compass. Therefore, the outer diameter of panel 3 must be larger than the outer diameter of the mounting panel of the standard magnetic compass. This facilitates the operation of construction personnel during the installation of the standard magnetic compass and provides reliable support and stability for the standard magnetic compass after installation.

[0044] Example 2

[0045] Based on Example 1, if the gasket 4 is corroded and cracked, it is necessary to prevent water from flowing into the standard magnetic compass and the base through the connection between the standard magnetic compass and the base.

[0046] Based on this, see Figures 3-4 A waterproof ring 5 is provided on the upper and lower end faces of the gasket 4. The waterproof ring 5 is preferably made of rubber. In addition, a water-blocking ring 6 is fixedly installed on the upper end face of the panel 3. The outer diameter of the water-blocking ring 6 is slightly smaller than the inner diameter of the gasket 4. The water-blocking ring 6 is sealed and welded to the upper end of the panel 3. When installing the gasket 4, the inner wall of the gasket 4 is tightly attached to the outer circumference of the water-blocking ring 6. The water-blocking ring 6 is preferably made of non-magnetic steel and is in close contact with the upper and lower waterproof rings to form an annular waterproof space, blocking water inside the gasket 4.

[0047] Furthermore, the inner diameter of panel 3 must be smaller than the inner diameter of the standard magnetic compass. The size of the inner diameter of panel 3 should be suitable for installing the water-retaining ring 6. The height of the water-retaining ring 6 must be higher than the height of the waterproof ring 5 located on the upper end face of the gasket 4. After the standard magnetic compass is installed, the water-retaining ring 6 will be in close contact with the inner wall of the standard magnetic compass, thus isolating water at the gap between the standard magnetic compass and the waterproof ring 5.

[0048] When installing a waterproof standard magnetic compass base, the installation sequence is as follows:

[0049] Step a. According to the installation requirements of the standard magnetic compass, first mark the centerline at the front of the ship, and make a circular hole on the compass deck with any point on the centerline as the center.

[0050] Step b. Align the center opening of the pad 1 with the opening of the compass deck, drill a positioning hole for the compass deck through the through hole of the pad 1, after drilling, apply a layer of non-magnetic sealant between the compass deck and the base plate, and apply anti-rust primer and topcoat to the through hole, and then fix the two with non-magnetic bolts.

[0051] Step c. Align the center of the round tube 2 with the center of the pad 1, and use non-magnetic welding wire to seal and weld the joint between the round tube 2 and the pad 1.

[0052] Step d. Align the center of panel 3 with the center of round tube 2, and use non-magnetic welding wire to seal and weld the joint between panel 3 and round tube 2.

[0053] Step e. Mark the welding positions of the elbow plate 7 along the outer circumference of the round tube 2, and use non-magnetic welding wire to weld the same elbow plate 7 to the pad plate 1, the round tube 2 and the panel 3 one by one.

[0054] Step f. Align the water-blocking ring 6 with the center of the panel 3 and use non-magnetic welding wire to seal and weld the joint between the water-blocking ring 6 and the panel 3.

[0055] Step g. Stack the lower waterproof ring, gasket 4, and upper waterproof ring from bottom to top in sequence, and align them with the center of panel 3 to complete the assembly of the waterproof standard magnetic compass base.

[0056] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0057] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0058] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A waterproof standard magnetic compass base, characterized in that: Includes a pad (1), the pad (1) has a central opening and is fixedly connected to the compass deck by bolts, the upper end face of the pad (1) is provided with a round tube (2), the lower end of the round tube (2) is sealed and welded to the pad (1), the upper end of the round tube (2) is sealed and welded with a panel (3), the panel (3) has a central opening and extends into the round tube (2), and the upper end face of the panel (3) is provided with a washer (4).

2. The waterproof standard magnetic compass base according to claim 1, characterized in that: Waterproof rings (5) are provided on both the upper and lower end faces of the gasket (4), and a water-blocking ring (6) is sealed and welded on the upper end face of the panel (3). The outer wall of the water-blocking ring (6) is tightly attached to the inner wall of the gasket (4). The inner diameter of the panel (3) is smaller than the inner wall diameter of the standard magnetic compass, so as to facilitate the installation of the water-blocking ring (6).

3. The waterproof standard magnetic compass base according to claim 2, characterized in that: An elbow plate (7) is provided between the panel (3) and the pad (1). The elbow plate (7) is welded and fixed to the lower end face of the panel (3), the outer periphery of the round tube (2) and the upper end face of the pad (1) respectively. The number of elbow plates (7) is set to multiple and distributed at intervals along the circumference of the round tube (2).

4. A waterproof standard magnetic compass base according to claim 3, characterized in that: The outer diameter of the pad (1) is greater than the outer diameter of the panel (3), and the thickness of the pad (1) is not less than the thickness of the compass plate; the outer diameter of the panel (3) is greater than the outer diameter of the mounting panel of the standard magnetic compass; the inner diameter of the round tube (2) is greater than the opening diameter of the pad (1).

5. A waterproof standard magnetic compass base according to claim 1, characterized in that: The round tube (2) is selected from a cylinder or a seamless steel pipe made of non-magnetic steel plate.

6. A waterproof standard magnetic compass base according to claim 1, characterized in that: The washer (4) is made of hardwood or other non-magnetic materials.

7. A waterproof standard magnetic compass base according to claim 1, characterized in that: The bolts used are non-magnetic bolts.

8. The installation method of the waterproof standard magnetic compass base according to claim 4, characterized in that, Includes the following steps: Step a. According to the standard magnetic compass installation requirements, first mark the centerline at the front of the ship, and make a circular hole on the compass deck with any point on the centerline as the center; Step b. Align the center opening of the pad (1) with the opening of the compass deck, drill a positioning hole for the compass deck from the through hole of the pad (1), after drilling, apply a layer of non-magnetic sealant between the compass deck and the pad (1) of the base, and apply anti-rust primer and topcoat to the through hole, and then use non-magnetic bolts to fix the two together. Step c. Place the round tube (2) and the pad (1) with their centers aligned, and use non-magnetic welding wire to seal the joint between the round tube (2) and the pad (1); Step d. Align the center of the panel (3) with the center of the round tube (2), and use non-magnetic welding wire to seal the joint between the panel (3) and the round tube (2); Step e. Mark the welding position of the elbow plate (7) along the outer periphery of the round tube (2), and use non-magnetic welding wire to weld the same elbow plate (7) to the pad (1), the round tube (2) and the panel (3) one by one; Step f. Align the water-blocking ring (6) with the center of the panel (3) and use non-magnetic welding wire to seal the joint between the water-blocking ring (6) and the panel (3); Step g. Stack the lower waterproof ring, gasket (4), and upper waterproof ring from bottom to top in sequence, and align them with the center of the panel (3) to complete the assembly of the waterproof standard magnetic compass base.

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