An electromagnetic auxiliary device and method for positioning and drilling water holes in a sea valve box.

Abstract

This invention discloses an electromagnetic auxiliary device and method for drilling water holes in a sea passage valve box. The device includes a body equipped with a magnetic rod and a current regulator, a switch for controlling the power supply, an adjustment knob for controlling the current magnitude to change the magnetic force of the magnetic rod, and a storage box containing a template circle and iron beads. The method includes: determining the center of the water hole inside the sea passage valve box and marking the water hole positioning mark; using the electromagnetic auxiliary device to sequentially transfer the water hole positioning mark inside the sea passage valve box to the outside of the hull plate; and drilling and processing the water holes on the outside of the hull plate. This invention achieves precise positioning of the water hole drilling by first locating the water hole inside the sea passage valve box and then using the electromagnetic auxiliary device to magnetically attract iron beads to map the water hole position to the outside of the hull plate, avoiding the possibility of drilling the water hole into nearby oil or water tanks; it also reduces the positioning difficulty and improves construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shipbuilding equipment, and particularly relates to an electromagnetic auxiliary device and method for positioning and drilling of a flow hole of a sea valve box. BACKGROUND

[0002] The sea valve box is an important component of a ship cooling system and is a passage connecting seawater and pipeline inlet and outlet. Generally, seawater from outside is collected through the sea valve box and then transported to each device through the pipeline system. The sea valve box is usually composed of a sea valve, an air vent valve, a blow valve, a sacrificial anode, an anti-fouling and anti-corrosion device, and a flow hole. The flow hole is arranged on the four corners of the sea valve box and is mainly used for discharging the silt in the sea valve box when the ship is docked at the wharf. When the ship is docked, the water and silt in the sea bottom door can be discharged through the flow hole.

[0003] When the position of the flow hole is determined, if the drilling is positioned inside the sea valve box, the distance from the bulkhead is about 100 mm, and since the distance from the bulkhead to the flow hole position is short, it is basically in a straight line state, which is convenient for measurement. However, the internal space of the sea valve box of some ships is limited, and the flow hole can only be drilled from the outside of the ship to the inside of the ship.

[0004] When the position of the flow hole is determined, if the drilling is positioned on the outside of the ship body outer plate outside the sea valve box, since it is difficult to confirm the position of the bulkhead welding seam, positioning errors are easily generated, and therefore the distance from the grating on the sea valve box is generally measured, but the distance from the grating to the flow hole is large, the sea valve box is generally more than 1 m, and it is also difficult to measure the long circular arc curved surface, which is time-consuming and laborious and is also prone to large positioning errors.

[0005] In addition, there are cases where the flow hole of the sea valve box is mistakenly drilled into the oil and water tank near the sea valve box, thereby causing the problem of replacing the outer plate, increasing the rework cost; in more serious cases, when the flow hole is mistakenly drilled into the oil and water tank near the sea valve box and is not discovered in time, it will also affect the time node of the undocking.

[0006] The existing Chinese invention application file with the publication number CN113843474A discloses a kind of ship side pipe connecting plate opening positioning device and method, "the present application discloses a kind of ship side pipe connecting plate opening positioning device and method, the device is fixed on the side valve by magnetic base, the scale on scale ruler is used to simulate the length of the first side of side pipe connecting, the angle of the pointer of angle indicator is used to simulate the elbow angle of side pipe connecting, laser beam is used to simulate the second side of side pipe connecting, laser beam is projected to the point on the hull plate along the elbow angle, it is the center point of the opening of side pipe connecting on hull plate, again with the pipe size on the part drawing of side pipe connecting, it can be obtained that the opening contour of side pipe connecting on hull plate by expanding outside this center point", but, the plate opening positioning method is complex, is applied to side pipe connecting plate, more attention is paid to pipe angle, cannot be extended to the through sea valve box with higher opening position requirement. SUMMARY

[0007] To solve the problems existing in the prior art described above, the purpose of the present application is to provide an electromagnetic auxiliary device and method for positioning and drilling of through sea valve box water hole, which solves the problem of large positioning error of through sea valve box water hole drilling from the outside of the ship to the inside of the ship, and even misdrilling the water hole into the adjacent oil and water tank.

[0008] To achieve the above-mentioned purpose and other related purposes, the present application adopts the following technical solutions:

[0009] In a first aspect of the present application, an electromagnetic auxiliary device for positioning and drilling of through sea valve box water hole is provided, which comprises a body, a magnetic rod, a current regulator, a switch and a storage box, the body is provided with a magnetic rod and a current regulator; one end of the magnetic rod extends out of the bottom of the body, the magnetic rod, the current regulator and the switch are electrically connected by wires, at the same time, the magnetic rod is connected to the power supply by wires, the switch is used to control the on-off of the power supply, and the switch is located on the outer side of the body; the current regulator is provided with an adjusting knob for controlling the current size to change the magnetic force of the magnetic rod, and the adjusting knob is exposed on the outer side of the body; the top end of the body is detachably connected with the storage box, the storage box is provided with a sample circle and a plurality of iron balls, the sample circle is a circular metal plate, and a center hole for marking the center of the water hole is formed at the center position of the sample circle.

[0010] Preferably, the receiving box is further provided with an iron bead collecting box, the iron beads are placed in the iron bead collecting box, the top of the iron bead collecting box is provided with an openable opening, and the sidewall of the iron bead collecting box has the same curvature as the hull plate at the installation position of the sea valve box.

[0011] Further preferably, the magnetic rod comprises an iron rod and a wire, the iron rod is cylindrical, the wire is wound around the iron rod to form a coil, the diameter of the iron rod is the same as the diameter of the water hole, and a protective sleeve is arranged on one end of the magnetic rod extending out of the bottom of the body.

[0012] Further preferably, the current regulator is a sliding rheostat.

[0013] Further preferably, the material of the receiving box is organic glass.

[0014] Further preferably, the iron beads are fine particles, and the outer surface of the iron beads is provided with a colored layer.

[0015] In a second aspect, the application provides an electromagnetic auxiliary method for positioning and drilling the water hole of the sea valve box by using the device, comprising the following steps,

[0016] S1, determining the center of the water hole in the sea valve box, and marking the positioning mark of the water hole:

[0017] According to the arrangement and installation drawing of the sea valve box, the center positions of the water holes in the sea valve box are determined, and the positioning marks of the center and circumference of the water hole are marked on the inner side plate surface of the sea valve box;

[0018] S2, transplanting the positioning mark of the water hole in the sea valve box to the outer side of the hull plate:

[0019] One end of the magnetic rod is placed in the inner side of the sea valve box, so that the center of the end face of the magnetic rod coincides with the center position of the water hole; the magnetic rod is electrified and the current is adjusted to generate a magnetic force; the iron beads are placed at the position where the magnetic force is generated on the outer side of the hull plate, so that the iron beads are adsorbed on the hull plate to form an iron bead adsorption circle; the size of the current is adjusted to change the size of the magnetic force of the magnetic rod, so that the circumference edge of the sample circle with a center hole is aligned and coincides with the circumference edge of the iron bead adsorption circle, and the center position of the water hole is marked at the center hole to obtain the center position of the water hole; the current is reduced until the power is off, and the magnetic beads are recovered;

[0020] S3, repeating step S2, transplanting the positioning mark of the water hole in the sea valve box to the outer side of the hull plate in sequence;

[0021] S4, opening each water hole on the outer side of the hull plate and processing.

[0022] As a preferred technical solution, in the step S1, the specific steps are as follows:

[0023] S1-1, according to the sea valve box arrangement installation drawing, the position of the center of each water hole is determined;

[0024] According to the drawing, the distance between the water hole center and the longitudinal bulkhead of the sea valve box is LB, and the distance between the water hole center and the transverse bulkhead of the sea valve box is LA;

[0025] S1-2, mark and draw the positioning mark of the water hole in the sea valve box;

[0026] By measuring the water hole center position marked at the four corners of the inner side plate of the sea valve box, and according to the radius R of the water hole, the circumferential position of the water hole is drawn.

[0027] As a preferred technical solution, in the step S2, the specific steps include:

[0028] S2-1, when the radius r of the magnetic rod is different from the radius R of the water hole, the circumferential position of the magnetic rod is drawn on the inner side plate of the sea valve box according to the water hole center and the radius r of the magnetic rod;

[0029] S2-2, the circumferential position of one end of the magnetic rod coincides with the circumferential position of the sea valve box inside and is supported stably;

[0030] S2-3, close the switch of the power supply, and adjust the output current to the maximum through the adjusting knob on the current regulator, so that the magnetic force generated by the magnetic rod is the strongest;

[0031] S2-4, use the sample circle to confirm the position of the magnetic force generated on the outside of the ship's outer plate where the water hole is prepared to be opened, and the iron beads are adsorbed on the outside of the ship's outer plate to form an iron bead adsorption circle;

[0032] S2-5, adjust the adjusting knob to change the size of the magnetic force of the electromagnet until the diameter of the iron bead adsorption circle is equal to the diameter of the sample circle;

[0033] S2-6, align the circumferential edge of the sample circle with the edge of the iron bead adsorption circle, mark at the center hole of the sample circle, so as to determine the positioning position of the water hole center on the outside of the ship's outer plate, and obtain the water hole center of the ship's outer plate;

[0034] S2-7, adjust the adjusting knob to the minimum and then close it completely, and recover the iron beads.

[0035] As a further preferred technical solution, in the step S2-7, after the iron beads are recovered, if the iron beads are magnetized after being used for many times, high temperature demagnetization treatment is carried out.

[0036] As a further preferred technical solution, in step S2-6, if the distance between the obtained hull plate water hole center and the hull plate weld is < 50 mm, the position of the hull plate water hole center is adjusted until the distance between the hull plate water hole center and the hull plate weld is ≥ 50 mm.

[0037] As a preferred technical solution, in step S4, the specific steps include:

[0038] S4-1, according to the water hole radius R required by the drawing, select a magnet drill bit with the same radius, according to the transplanted water hole center positioning mark, align the magnet drill bit with the hull plate water hole center and perpendicular to the outer side of the hull plate, and then drill, repeat the operation until each water hole is completed on the hull plate;

[0039] S4-2, after the water hole is drilled, each water hole is deburred;

[0040] S4-3, repair the inner surface of each water hole and the surrounding damaged areas.

[0041] As described above, the present application has the following beneficial effects:

[0042] (1) The electromagnetic auxiliary device and method for positioning and drilling of the sea valve box water hole of the present application first positions the position of the water hole inside the sea valve box, and then adjusts the magnetic force of the iron ball to copy the position of the water hole to the outer side of the hull plate, realizes accurate positioning of the water hole drilling, avoids the possibility of drilling the water hole into the nearby oil and water cabin, reduces the positioning difficulty, and improves the construction efficiency.

[0043] (2) The electromagnetic auxiliary device and method for positioning and drilling of the sea valve box water hole of the present application uses a sample circle and an iron ball, which can be conveniently adsorbed and removed, and is convenient to position and can be reused through high-temperature demagnetization treatment.

[0044] (3) The electromagnetic auxiliary device and method for positioning and drilling of the sea valve box water hole of the present application has simple structure, low cost, convenient use, and is easy to popularize and apply. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is the front view of the electromagnetic auxiliary device in the present application.

[0046] Figure 2 is the left view of the electromagnetic auxiliary device in the present application.

[0047] Figure 3 is the circuit diagram of the electromagnetic auxiliary device in the present application.

[0048] Figure 4 is the front view of the sample circle in the present application.

[0049] Figure 5 is the sectional view of the storage box in the embodiment 1 of the present application.

[0050] Figure 6 is the sectional view of the storage box and the iron bead collecting box in the embodiment 2 of the present application.

[0051] Figure 7 is the top view of the sea valve box in the embodiment 3 of the present application.

[0052] Figure 8 is the expanded view of the outer plate of the sea valve box in the embodiment 3 of the present application.

[0053] Figure 9 is the flow chart of the electromagnetic auxiliary method for positioning and drilling the water hole of the sea valve box in the present application.

[0054] Figure 10 is the flow chart of step S2 in the electromagnetic auxiliary method for positioning and drilling the water hole of the sea valve box in the present application.

[0055] In which, the reference signs are specifically described as follows:

[0056] 1, the body; 2, the storage box; 21, the iron bead; 22, the sample circle; 221, the center hole; 23, the iron bead collecting box; 3, the switch; 31, the power supply; 4, the current regulator; 41, the adjusting knob; 5, the magnetic rod; 51, the coil; 52, the wire; 53, the iron rod; 6, the protective sleeve; 7, the sea valve box; 8, the water hole; 9, the grid; 10, the longitudinal bulkhead; 11, the transverse bulkhead. DETAILED DESCRIPTION

[0057] In order to better understand the purpose, structure and function of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0058] In the description of the present application, it should be noted that the position relationship indicated in the specification such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the position relationship based on the position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular direction, and therefore cannot be understood as a limitation on the present application.

[0059] Embodiment 1

[0060] AsFigures 1-5 The embodiment shown provides an electromagnetic auxiliary device for positioning and drilling of a flow hole of a sea valve box, which comprises a body 1, a magnetic bar 5, a protective sleeve 6, a power supply 31, a switch 3, a current regulator 4, an adjusting knob 41, a storage box 2, a sample circle 22 and a plurality of iron beads 21.

[0061] The body 1 is provided with the magnetic bar 5 and the current regulator 4, one end of the magnetic bar 5 extends out of the bottom of the body 1 and is sleeved with the protective sleeve 6. The magnetic bar 5, the current regulator 4 and the switch 3 are electrically connected through the wire 52, at the same time, the magnetic bar 5 is connected to the external power supply 31 through the wire 52, the external power supply 31 can provide direct current for the electromagnetic auxiliary device, the switch 3 controls the on-off of the power supply 31, and the switch 3 is located on the outer side of the body 1.

[0062] The magnetic bar 5 comprises an iron bar 53 and a wire 52, the iron bar 53 is cylindrical, the diameter of the iron bar 53 is not greater than the diameter of the flow hole 8, in the embodiment, the diameter of the iron bar 53 is the same as the diameter of the flow hole 8, which is convenient for accurate positioning; the wire 52 is regularly and closely wound on the outer surface of the iron bar 53 to form a coil 51, and the iron bar 53 generates magnetic force after being electrified.

[0063] In the embodiment, according to the arrangement and installation drawing of the sea valve box 7, it can be known that the distance between the center of the flow hole 8 and the longitudinal bulkhead 10 of the sea valve box is LB, the distance between the center of the flow hole 8 and the transverse bulkhead 11 of the sea valve box is LA, the distance between the center of the magnetic bar 5 and the upper and lower edges of the body 1 is La, and the distance between the center of the magnetic bar 5 and the left and right edges of the body 1 is Lb, La=Lb<LA=LB, which avoids the collision between the body 1 and the longitudinal bulkhead 10 and the transverse bulkhead 11 of the sea valve box after the magnetic bar 5 is placed.

[0064] The adjusting knob 41 is arranged on the current regulator 4, the adjusting knob 41 is exposed on the outer side of the body 1, the adjusting knob 41 is used for controlling the current size, the resistance size of the current regulator 4 can be adjusted through the adjusting knob 41, so as to change the current size delivered by the power supply 31 to the coil 51, and then change the magnetic force size of the magnetic bar 5, in the embodiment, the current regulator 4 is a sliding rheostat.

[0065] The body 1 top detachable connection has a storage box 2, the storage box 2 is equipped with a sample plate circle 22 and several iron beads 21. The storage box 2 is made of organic glass material, which is convenient to check the adsorption condition; the iron beads 21 are fine particles, and the outer surface of the iron beads 21 is provided with a colored layer, that is, the outer surface of the iron beads 21 is coated with a very thin color, which is convenient to check the edge of the iron beads 21 for positioning; the sample plate circle 22 is made of a circular thin metal plate, and a center hole 221 is formed in the center position of the sample plate circle 22, which can pass the pen head of a marker pen, used for marking the center of the water hole 8.

[0066] In actual work, according to the layout drawing of the sea valve box 7, the center of the water hole 8 is marked on the inside plate of the sea valve box 7, and the circumferential positioning mark of the water hole 8 is drawn; the end of the magnetic rod 5 is aligned with the circumference of the water hole 8; the device is powered on through the switch 3, and the resistance of the current regulator 4 is adjusted to the minimum through the adjusting knob 41, at this time the current of the power supply 31 through the iron rod 53 is the largest, so that the magnetic force of the magnetic rod 5 is the largest, and the range of the magnetic force of the magnetic rod 5 is confirmed on the ship body outer plate by using the sample plate circle 22; remove the sample plate circle 22, and place the storage box 2 containing the iron beads 21 close to the ship body outer plate, and move from the highest position of the ship body outer plate with magnetic force to the bottom, so that the iron beads 21 in the storage box 2 are adsorbed on the ship body outer plate to form an iron bead adsorption circle; then adjust the storage box 2 to open upward and close to the ship body outer plate, and place it at the lowermost end of the iron bead adsorption circle, adjust the resistance of the sliding rheostat through the adjusting knob 41, reduce the magnetic force of the magnetic rod 5, so that the iron beads 21 automatically fall into the storage box 2, until the diameter of the iron bead adsorption circle is equal to the diameter of the sample plate circle 22; align the circumferential edge of the sample plate circle 22 with the edge of the iron bead adsorption circle, and mark at the center hole 221 of the sample plate circle 22 to determine the positioning position of the center of the water hole 8.

[0067] Example 2

[0068] As shown in Figures 1-4 and Figure 6 The embodiment provides another storage box 2 stored in the storage cabinet for the electromagnetic auxiliary device for positioning and drilling the water hole 8 of the sea valve box 7, which includes a body 1, a magnetic rod 5, a power supply 31, a switch 3, a current regulator 4, an adjusting knob 41, a storage box 2, a sample plate circle 22, several iron beads 21 and an iron bead collecting box 23.

[0069] The body 1 is provided with a magnetic bar 5 and a current regulator 4, one end of the magnetic bar 5 extends out of the bottom of the body 1 and is sleeved with a protective sleeve 6. The magnetic bar 5, the current regulator 4 and the switch 3 are electrically connected through the wire 52, at the same time, the magnetic bar 5 is connected to the external power supply 31 through the wire 52, the external power supply 31 can provide direct current for the electromagnetic auxiliary device, the switch 3 controls the on-off of the power supply 31, and the switch 3 is located on the outer side of the body 1.

[0070] The magnetic bar 5 includes an iron bar 53 and a wire 52, the iron bar 53 is cylindrical, the diameter of the iron bar 53 is not greater than the diameter of the water flow hole 8, in this embodiment, the diameter of the iron bar 53 is the same as the diameter of the water flow hole 8, which is convenient for accurate positioning; the wire 52 is regularly and closely wound on the outer surface of the iron bar 53 to form a coil 51, and the iron bar 53 generates magnetic force after being electrified.

[0071] The current regulator 4 is provided with an adjusting knob 41, the adjusting knob 41 is exposed on the outer side of the body 1, the adjusting knob 41 is used for controlling the current size, the resistance size of the current regulator 4 can be adjusted through the adjusting knob 41, so as to change the current size of the power supply 31 to the coil 51, and then change the magnetic force size of the magnetic bar 5, in this embodiment, the current regulator 4 is a sliding rheostat.

[0072] The top of the body 1 is detachably connected with a storage box 2, the storage box 2 is internally provided with a sample circle 22, a plurality of iron beads 21 and an iron bead collecting box 23. The storage box 2 is made of organic glass material, which is convenient for checking the adsorption condition; the iron beads 21 are fine particles, and the outer side surface of the iron beads 21 is provided with a coloring layer, that is, the outer side surface of the iron beads 21 is coated with a very thin color, which is convenient for checking the edge of the iron beads 21 for positioning; the sample circle 22 is made of a circular thin metal plate, a center hole 221 is formed at the central position of the sample circle 22, the center hole 221 can pass the pen head of a marking pen, and is used for marking the center of the water flow hole 8.

[0073] The top of the iron bead collecting box 23 is provided with an openable opening, in this embodiment, a box cover is arranged, the iron beads 21 are placed in the iron bead collecting box 23, and the side wall of the iron bead collecting box 23 has the same curvature as the outer plate of the ship body at the installation position of the sea valve box 7, so that the iron bead collecting box 23 can better fit the outer plate of the ship body, so as to effectively collect the iron beads 21 falling due to the decrease of the magnetic force of the magnetic bar 5.

[0074] In practical work, according to the layout and installation drawings of the sea valve box 7, the center of the water flow hole 8 is marked on the inner side plate of the sea valve box 7, thus marking the circumferential positioning mark of the water flow hole 8; align the circumference of the end of the magnetic rod 5 with the circumference of the quasi-water flow hole 8; power on the device through the switch 3, and adjust the resistance of the current regulator 4 to the minimum through the adjustment knob 41. At this time, the current through the iron rod 53 of the power supply 31 is the maximum, thus maximizing the magnetic force of the magnetic rod 5. Use the template circle 22 to confirm the range of magnetic attraction generated by the magnetic rod 5 on the outer plate of the ship; remove the template circle 22, and place the opening of the iron ball collection box 23 containing the iron ball 21 close to the outer plate of the ship, from the magnetic... The highest point of the suction force moves downward, causing the iron balls 21 in the iron ball collection box 23 to adhere to the outer plate of the ship and form an iron ball adsorption circular surface. Then, the iron ball collection box 23 is adjusted so that the opening faces upward and is close to the outer plate of the ship, and placed at the bottom of the iron ball adsorption circular surface. The resistance of the sliding rheostat is adjusted by adjusting the knob 41 to reduce the magnetic force of the magnetic rod 5, so that the iron balls 21 automatically fall into the iron ball collection box 23 until the diameter of the iron ball adsorption circular surface is equal to the diameter of the template circle 22. The circumferential edge of the template circle 22 is aligned with the edge of the iron ball adsorption circular surface, and a mark is made at the center hole 221 of the template circle 22 to determine the positioning position of the center of the water flow hole 8.

[0075] Example 3

[0076] like Figures 7-10 As shown, this embodiment provides an electromagnetic-assisted method for positioning and drilling water holes in a sea valve box using Embodiment 2. The method includes the following steps:

[0077] S1. According to the layout and installation drawings of the Tonghai valve box 7, determine the center position of each water flow hole 8 on the inner side of the Tonghai valve box 7 and mark the center of the water flow hole 8 on the inner side plate of the Tonghai valve box 7.

[0078] S1-1. Based on the layout and installation drawings of the sea valve box 7, determine the position of the center of each water outlet 8.

[0079] According to the drawings, the distance between the center of the water outlet 8 and the longitudinal bulkhead 10 of the sea valve box is LB, and the distance between the center of the water outlet 8 and the transverse bulkhead 11 of the sea valve box is LA.

[0080] S1-2. Mark and mark the positioning marks of the water flow hole 8 inside the sea valve box 7.

[0081] The center positions of the water outlets 8 are marked at the four corners of the inner side plate of the sea valve box 7 by measurement. At the same time, the circumference of the water outlets 8 is drawn using a compass according to the radius R of the water outlets 8. The radius of the water outlets 8 is generally determined according to the sea valve and the siltation inside the sea valve box 7, and is generally at least about 10mm.

[0082] S2, the electromagnetic auxiliary device is used to transplant and copy the position mark of the water hole 8 in the sea valve box 7 to the outside of the hull plate.

[0083] S2-1, when the radius r of the magnetic rod 5 is different from the radius R of the water hole 8, the compass is used to draw the placement circle position of the magnetic rod 5 on the inside plate of the sea valve box 7 according to the center of the water hole 8 and the radius r of the magnetic rod 5.

[0084] S2-2, the one end of the magnetic rod 5 of the electromagnetic auxiliary device is coincided with the placement circle position in the sea valve box 7 and is supported and stabilized.

[0085] S2-3, the switch 3 of the electromagnetic auxiliary device is closed, and the output current is adjusted to the maximum through the adjusting knob 41 on the current regulator 4, at this time the magnetic force generated by the magnetic rod 5 is the strongest.

[0086] S2-4, the position of the magnetic force generated on the outside of the hull plate is confirmed, and the iron beads 21 are adsorbed on the outside of the hull plate.

[0087] The range of the magnetic force generated by the magnetic rod 5 is confirmed on the hull plate where the water hole 8 is prepared to be opened, the opening of the storage box 2 containing the iron beads 21 is closely attached to the hull plate above the position of the hull plate outside, and the iron beads 21 in the storage box 2 are adsorbed on the hull plate to form an iron bead adsorption circle surface from the highest position of the hull plate with magnetic force.

[0088] S2-5, the magnetic force of the electromagnet is adjusted by adjusting the adjusting knob 41 until the diameter of the iron bead adsorption circle surface is equal to the diameter of the sample circle 22.

[0089] The storage box 2 is adjusted to be opened upward and closely attached to the hull plate, and the storage box 2 is placed at the lowermost end of the iron bead adsorption circle surface, the resistance of the sliding rheostat is adjusted through the adjusting knob 41, the magnetic force of the magnetic rod 5 is reduced, the iron beads 21 are automatically dropped into the storage box 2, and the diameter of the iron bead adsorption circle surface is equal to the diameter of the sample circle 22.

[0090] Adjusting the size of the magnetic force can prevent the edge of the iron beads 21 from being dispersed after being adsorbed due to the excessive magnetic attraction of the magnetic rod 5 caused by the thin hull plate, and finally the purpose of adjusting the size of the magnetic force can make the edge of the circle surface formed after the iron beads 21 are adsorbed more concentrated, so that the center of the water hole 8 obtained by positioning is more accurate.

[0091] S2-6, the circumferential edge of the sample circle 22 is aligned with the edge of the iron bead adsorption circle surface, and the center hole 221 of the sample circle 22 is marked to determine the positioning position of the center of the water hole 8 on the outside of the hull plate, and the center of the water hole 8 of the hull plate is obtained.

[0092] S2-7, adjust until the electromagnetic auxiliary device is closed, and the iron beads 21 are recovered.

[0093] The storage box 2 is placed below the adsorbed iron beads 21, the adjusting knob 41 of the electromagnetic auxiliary device is gradually adjusted to be smaller until it is completely closed, and then the electromagnetic auxiliary device is stored, at this time the iron beads 21 adsorbed on the outside of the hull plate will fall into the storage box 2, which is convenient for next use. When the iron beads 21 are magnetized after being used for many times, high-temperature demagnetization treatment is carried out.

[0094] S2-8, if the distance between the center of the hull plate water hole 8 obtained by positioning according to the drawing and the hull plate weld is less than 50mm, the center of the hull plate water hole 8 is adjusted until the center of the hull plate water hole 8 is greater than or equal to 50mm from the hull plate weld, so as to avoid the water hole 8 being too close to the hull plate weld and damaging the connection strength of the plate.

[0095] S3, repeat step S2 to transplant the positioning marks of the water holes 8 in the sea valve box 7 to the outside of the hull plate in turn.

[0096] S4, each water hole 8 is opened on the outside of the hull plate and processed.

[0097] S4-1, according to the required radius R of the water hole 8 according to the drawing, an iron adsorption drill bit with the same radius is selected, the iron adsorption drill bit is aligned with the center of the hull plate water hole 8 according to the transplanted center positioning mark of the water hole 8, the power 31 of the iron adsorption drill is turned on to adsorb the iron adsorption drill on the outside of the hull plate, the drill bit is adjusted to be perpendicular to the curved surface of the outside of the hull plate, and then the iron adsorption drill is used to drill holes on the outside of the hull plate, and the operation is repeated until each water hole 8 is opened on the hull plate.

[0098] S4-2, after the water hole 8 is drilled, the burr of each water hole 8 is scraped.

[0099] S4-3, the inner surface of each water hole 8 and the surrounding damaged places are repaired to prevent seawater corrosion.

[0100] The above only describes the preferred embodiments of the present application and does not limit the present application. Any person skilled in the art can make various changes or equivalent replacements to the features and embodiments without departing from the spirit and scope of the present application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the present application without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. An electromagnetic assist device for use in the positioning of a drill hole for a sea chest flow aperture, characterised in that, The utility model relates to a magnetic force adjustable flow hole marking device, including body (1), magnetic bar (5), current regulator (4), switch (3) and receiving box (2), the body (1) is provided with magnetic bar (5) and current regulator (4) in, and one end of magnetic bar (5) extends out the bottom of body (1), and magnetic bar (5), current regulator (4) and switch (3) are electrically connected through wire (52), simultaneously, magnetic bar (5) is connected to power supply (31) through wire (52), and switch (3) is used for controlling the on-off of power supply (31), and switch (3) is located on the outside of body (1), and current regulator (4) is equipped with the regulating button (41) for controlling the current size to change the magnetic force size of magnetic bar (5) on, and regulating button (41) is exposed on the outside of body (1), and the detachable connection of receiving box (2) is established to the top of body (1), and receiving box (2) is loaded with sample plate circle (22) and a plurality of iron beads (21), and sample plate circle (22) is circular metal plate, and the center hole (221) for marking the center of flow hole (8) is formed in the central position of sample plate circle (22), Receiving box (2) is also loaded with iron bead collecting box (23), and iron bead (21) is placed in iron bead collecting box (23), and the opening of iron bead collecting box (23) top is movably closed, and the curvature of the side wall of iron bead collecting box (23) is same with the curvature of the hull plate of sea valve box (7) installation place. Magnetic bar (5) includes iron bar (53) and wire (52), the iron bar (53) is cylindrical, wire (52) is wound on iron bar (53) and forms coil (51), the diameter of iron bar (53) is same with the diameter of flow hole (8), and the end of magnetic bar (5) extending out the bottom of body (1) is provided with protective sleeve (6).

2. An electromagnetic assist device for use in the positioning of a flow hole for a sea chest valve box according to claim 1, characterised in that, Current regulator (4) is sliding rheostat.

3. An electromagnetic assist device for use in the positioning of a flow hole for a sea chest valve box according to claim 1, characterised in that, The material of receiving box (2) is organic glass.

4. An electromagnetic assist device for use in the positioning of a flow hole for a sea chest valve box according to claim 1, characterised in that, Iron bead (21) is fine particle, and the outside surface of iron bead (21) is provided with coloring layer.

5. An electromagnetic assist device for use in the positioning of a flow hole for a sea chest valve box according to claim 1, characterised in that, It includes the following steps, 6. An electromagnetic assisted method for positioning a flow hole drilling of a sea chest valve box using the electromagnetic assisting device as claimed in claim 1, characterized in that, S1, the center of flow hole (8) is determined in sea valve box (7), and the positioning mark of flow hole (8) is drawn: According to the layout drawing of sea valve box (7), the center position of each flow hole (8) is determined in the inside of sea valve box (7), and the positioning mark of the center and circumference of flow hole (8) is drawn on the inside plate surface of sea valve box (7); S2, the positioning mark of flow hole (8) in sea valve box (7) is transplanted to the outside of hull plate: One end of magnetic bar (5) is placed in the inside of sea valve box (7), so that the end surface center of magnetic bar (5) coincides with the center position of flow hole (8), and the magnetic force is generated after the current of magnetic bar (5) is electrified and adjusted, and the iron bead (21) is placed in the position of magnetic force on the outside of hull plate, so that the iron bead (21) is adsorbed on the hull plate and forms the iron bead adsorption circle surface. ​ Adjusting the current size, changing the magnetic force of the magnetic rod (5), aligning the circumferential edge of the sample circle (22) with the circumferential edge of the iron bead adsorption circle, marking at the center hole (221) of the sample circle (22), and obtaining the center position of the water hole (8); reduce the current until the power is off, and recover the magnetic beads at the same time; S3, repeat step S2, and transplant the positioning marks of the water hole (8) in the sea valve box (7) to the outside of the ship body plate in turn; S4, open each water hole (8) on the outside of the ship body plate and process it.

7. An electromagnetic assisted method for positioning a flow hole of a sea chest valve box according to claim 6, characterized in that, In step S1, the specific steps are as follows: S1-1, according to the sea valve box (7) arrangement installation drawing, determine the position of the center of each water hole (8); According to the drawing, the distance between the center of the water hole (8) and the longitudinal bulkhead (10) of the sea valve box is LB, and the distance between the center of the water hole (8) and the transverse bulkhead (11) of the sea valve box is LA; S1-2, mark and draw the positioning mark of the water hole (8) in the sea valve box (7); By measuring the four corners of the inside plate of the sea valve box (7), mark the center position of the water hole (8), and at the same time, draw the circumferential position of the water hole (8) according to the radius R of the water hole (8).

8. An electromagnetic assisted method for positioning a flow bore of a sea chest according to claim 6, characterized in that, The specific steps of step S2 include: S2-1, when the radius r of the magnetic rod (5) is different from the radius R of the water hole (8), draw the circumferential position of the magnetic rod (5) on the inside plate of the sea valve box (7) according to the center of the water hole (8) and the radius r of the magnetic rod (5); S2-2, align the circumferential end of the magnetic rod (5) with the circumferential position of the sea valve box (7) and support it stably; S2-3, close the switch (3) of the power supply, adjust the output current to the maximum through the adjusting knob (41) on the current regulator (4), so that the magnetic force generated by the magnetic rod (5) is the strongest; S2-4, use the sample circle (22) to confirm the position of the magnetic force generated on the outside of the ship body plate to prepare to open the water hole (8), and adsorb the iron beads (21) on the outside of the ship body plate to form an iron bead adsorption circle; S2-5, adjust the adjusting knob (41) to change the magnetic force of the electromagnet, until the diameter of the iron bead adsorption circle is equal to the diameter of the sample circle (22); S2-6, align the circumferential edge of the sample circle (22) with the edge of the iron bead adsorption circle, mark at the center hole (221) of the sample circle (22), so as to determine the positioning position of the center of the water hole (8) on the outside of the ship body plate, and obtain the center of the water hole (8) of the ship body plate; S2-7, adjust the adjusting knob (41) to the minimum until it is completely closed, and recover the iron beads (21) at the same time. In step S2-7, after recovering the iron beads (21), if the iron beads (21) are magnetized after being used for many times, high-temperature demagnetization treatment is carried out.

9. An electromagnetic assisted method for positioning a flow bore of a sea chest according to claim 8, characterized in that In step S2-6, if the distance between the obtained center of the water hole (8) of the ship body plate and the weld of the ship body plate is <50mm, adjust the position of the center of the water hole (8) of the ship body plate until the distance between the center of the water hole (8) of the ship body plate and the weld of the ship body plate is ≥50mm.

10. An electromagnetic assisted method for positioning a flow bore of a sea chest according to claim 8, characterized in that, In step S4, the specific steps include:

11. An electromagnetic assisted method for positioning a flow bore of a sea chest according to claim 6, characterized in that ​ S4-1, according to the radius R of the flow hole (8) on the drawing, select a magnet drill bit with the same radius, mark the center of the flow hole (8) according to the transplanted flow hole (8) center, align the magnet drill bit with the center of the flow hole (8) and perpendicular to the outer side of the hull plate, then drill, repeat until each flow hole (8) is completed on the hull plate; S4-2, after the flow hole (8) is drilled, the burr of each flow hole (8) is scraped; S4-3, repair the damaged parts on the inner surface and around of each flow hole (8).

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