Spraying method

Abstract

According to the spraying method, the coating trolley is provided with a circular-tube-shaped center rod, two circular-tube-shaped lateral rods are fixed to the two sides of the center rod, the two ends of each lateral rod are each provided with a spraying rod fixing block, and bottom trundles are fixed to the two sides of each spraying rod fixing block. Lateral wheel supports are arranged at the positions close to the fixing blocks, side face supporting wheels are arranged on the two sides of a main body of each lateral wheel support, and the side face supporting wheels are horizontally arranged. A material pipe connector is fixed to the bottom of the lateral rod, the top of the lateral rod is bent outwards and connected with a side face spray nozzle, the top end of the center rod is connected with a spray rod through a spray rod butt joint, a filter is arranged in the spray rod butt joint, and a mist spray nozzle is movably connected to the end of the spray rod. And after the strength test of the pressure stabilizing cavity unit is finished, the sand blasting and coating trolley enters from the open end of the pressure stabilizing cavity to carry out sand blasting and coating on the interior of the pressure stabilizing cavity unit, and a brush is used for coating in a gas spraying hole of the pressure stabilizing cavity. According to the invention, spraying and atomization are simultaneously carried out in a narrow space, the secondary operation is reduced, and the spraying period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of ship gas drag reduction, and in particular relates to a spraying method. Background Art

[0002] Ship gas drag reduction technology is a technology that forms a stable gas lubrication layer by introducing air into the bottom of the ship during the ship's travel, thereby reducing the friction resistance of the ship's surface. The ship's air layer drag reduction system includes an air supply system, a pressure stabilization chamber, and a jet hole. The jet hole is arranged on the bottom plate of the ship and is connected to the pressure stabilization chamber. When the ship is traveling, the air supply system supplies air to the pressure stabilization chamber, and the gas in the pressure stabilization chamber is ejected to the outside of the hull through the jet hole to form a gas lubrication layer on the bottom of the hull that can reduce resistance.

[0003] In order to ensure stable pressure output, a semicircular or square pressure stabilizing chamber is usually welded inside the double bottom on the outer plate of the bottom of the ship. When the ship is moored at the dock or encounters severe sea conditions during navigation, the ship's air layer drag reduction system will be shut down. At this time, seawater will enter the pressure stabilizing chamber from the jet hole and carry marine organisms into the pressure stabilizing chamber. Since seawater is corrosive, it will corrode the hull steel plate and the pressure stabilizing chamber. If it is immersed in the seawater environment for a long time, it will cause corrosion and cracking of the pressure stabilizing chamber and the bottom plate, thereby affecting the structural safety of the ship.

[0004] The pressure stabilizing chamber is a Φ168*20.0 semicircular tube, which is directly in contact with seawater. Although the semicircular tube of the pressure stabilizing chamber is made of a special steel tube containing 1% chromium, in order to further protect the semicircular tube and the thickened outer plate, the inside of the pressure stabilizing chamber still needs to be painted. The space inside the pressure stabilizing chamber is small, and it is welded on the thickened outer plate, so conventional phosphating, galvanizing and other treatment methods cannot be used. Due to the small space, personnel cannot enter, so special sandblasting and painting equipment is required when sandblasting and painting the inside of the pressure stabilizing chamber. According to the characteristics of the pressure stabilizing chamber, sandblasting and painting equipment is designed for sandblasting and painting. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for installing a pressure stabilizing chamber unit, aiming to shorten the overall construction period to the greatest extent and improve the construction quality. The technical solution adopted is: A spraying method, a painting trolley has a circular tubular center rod, two circular tubular lateral rods are fixed on both sides of the center rod, the two lateral rods are symmetrically fixed on both sides of the center rod, the center rod and the lateral rods are fixed by a spray rod fixing block, a spray rod fixing block is respectively arranged at both ends of the lateral rod, bottom casters are fixed on both sides of the spray rod fixing block, and the bottom casters are arranged vertically.

[0006] A lateral wheel bracket is arranged near the fixed block, the lateral wheel bracket has a block-shaped main body, the center rod and the lateral rod are inserted into the main body of the lateral wheel bracket and fixed, and side support wheels are arranged on both sides of the main body of the lateral roller bracket, and the side support wheels are arranged horizontally.

[0007] A material pipe joint is fixed at the bottom of the lateral rod, the top of the lateral rod is bent outward at a bending angle of 15°~30°, and is connected to a side nozzle. The top of the center rod is connected to the spray rod through a spray rod butt joint, a filter is arranged in the spray rod butt joint, and the end of the spray rod is movably connected to a mist nozzle.

[0008] After the strength test of the pressure stabilizing chamber unit is completed, the sandblasting and painting trolley enters from the open end of the pressure stabilizing chamber to sandblast and paint the inside of the pressure stabilizing chamber unit, and a brush is used to paint the air jet hole of the pressure stabilizing chamber.

[0009] Multiple pressure-stabilizing chamber units are closed to form an integral pressure-stabilizing chamber. The sealing box at the end of the pressure-stabilizing chamber is opened, and a painting trolley enters from the sealing box to repaint the inside of the pressure-stabilizing chamber. After repainting, the watertight manhole cover and the sealing box are sealed.

[0010] The above-mentioned spraying method is characterized in that the central rod and the lateral rod pass through the spray rod fixing block and are fixed to the spray rod fixing block by bolts.

[0011] The above-mentioned spraying method is characterized in that the diameter of the spray rod is smaller than the diameter of the center rod, and the length of the spray rod is 0.15 to 0.2 times the length of the center rod.

[0012] The above-mentioned spraying method is characterized in that the lateral rod starts to bend from the bottom to the top at 4 / 5 of its length.

[0013] The above-mentioned spraying method is characterized in that the top of the spray rod fixing block is arc-shaped and the bottom is horizontal.

[0014] The above-mentioned spraying method is characterized in that the side support wheels, the central rod and the lateral rod are located on the same horizontal plane.

[0015] The above-mentioned spraying method is characterized in that the atomizing nozzles around the front end are detachable and replaceable.

[0016] The present invention solves the problem of spraying in a narrow space and is a key equipment in the air layer rent reduction system. The present invention ensures that the spraying device sprays in a narrow space by setting forward and lateral rollers. At the same time, the atomizing spray rod of the equipment is in front and the side nozzle is in the back. Atomization and spraying are carried out simultaneously, reducing secondary operations. The spraying cycle is shortened, and unmanned spraying in a narrow space can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the pressure-stabilizing chamber painting trolley; Figure 2It is a schematic diagram of the sealing box structure at both ends of the pressure stabilizing cavity; Among them, 1-material pipe joint, 2-spray rod fixing block, 3-lateral wheel bracket, 4-bottom caster, 5-side support wheel, 6-side nozzle, 7-spray rod joint, 8-spray rod, 9-mist nozzle, 10-center rod, 11-lateral rod. DETAILED DESCRIPTION

[0018] The present invention will be further described in conjunction with the accompanying drawings.

[0019] like Figure 1 The pressure-stabilizing chamber painting trolley shown in the figure has a center rod 10, a spray rod joint 7, a spray rod 8 and a surrounding atomizing nozzle 9 are arranged at the front end of the center rod, the rear section of the center rod is connected to the compressor of the spraying equipment, the surrounding atomizing nozzle 9 at the front end is detachable and replaceable, and the spray rod joint 7 has a built-in filter. The spray rod 8 should not be too long, its diameter is smaller than the center rod 10, and its length is 0.15 to 0.2 times the length of the center rod, so as to avoid the front mass being too large and the joint 7 touching the ground. The surrounding atomizing nozzle 9 is a surrounding spray type nozzle, which can spray gas 360° inside the pressure-stabilizing chamber to facilitate the subsequent paint adhesion.

[0020] The spraying device has two lateral rods 11, and a bend is set at 1 / 5 of the front end of the lateral rod. A side nozzle 6 is set at the front end of the lateral rod. The bending angle is approximately 15°~30°. The reason for the bending is to have greater contact with the inside of the pressure stabilizing chamber when spraying paint sideways. The maximum width of the bending does not exceed the maximum width of the lateral wheel. The larger the angle, the better. A material pipe joint 1 is set at the rear end, and the sleeve joint 1 has a built-in filter connected to the spraying equipment.

[0021] Since the sandblasting device needs to slide in the pressure stabilizing chamber, two spray rod fixing blocks 2 are provided. The cross section of the fixing block 2 is a circular arc at the top and a rectangular structure at the bottom. Wheels 4 are provided on the left and right sides of the rectangular structure at the bottom, and the wheels can roll forward in the pressure stabilizing chamber. The center rod and the lateral rod are installed between the circular arc block and the rectangular block, fixed by screws, and can be disassembled. One of the fixing blocks is set at the rear end of the entire spraying device, and the other fixing block is set in the middle of the entire spraying device. This is to move the center of gravity of the spraying device backward to avoid excessive weight in the front and the mist nozzle touching the ground.

[0022] A lateral wheel bracket 3 is arranged in front of the spray rod fixing block 2. The bracket 3 is in a convex shape. It helps to fix the central rod and the lateral rod. At the same time, a side support wheel is arranged on the side. The side support wheel 5 runs on the inner wall of the pressure stabilizing chamber to ensure that the running direction of the entire trolley is not deviated.

[0023] The maximum width of the lateral wheel bracket 3 is smaller than the width of the inner wall of the pressure stabilizing chamber.

[0024] The maximum width of the spray bar fixing block 2 is not greater than the maximum width of the lateral wheel bracket 3 . Specific implementation methods

[0025] The internal painting of the pressure stabilizing chamber is carried out in two stages. After the pressure stabilizing chamber unit strength test is completed, the sandblasting and painting trolley enters from the open end of the pressure stabilizing chamber to sandblast and paint the inside of the pressure stabilizing chamber unit, and the air jet hole is painted with a brush; after the pressure stabilizing chamber is completely connected in the closing stage, the closing adjustment pipe area needs to be repainted, such as Figure 2 As shown, open the sealing boxes at both ends of the pressure stabilizing chamber, put them into the painting trolley for touch-up coating, and then replace the watertight manhole cover on the dead sealing box after touch-up coating.

Claims

1. A spraying method, characterized in that: The painting trolley has a circular tubular center rod (10), two circular tubular lateral rods (11) are fixed on both sides of the center rod, the two lateral rods are symmetrically fixed on both sides of the center rod, the center rod and the lateral rods are fixed by spray rod fixing blocks (2), a spray rod fixing block is respectively arranged at both ends of the lateral rod, bottom casters (4) are fixed on both sides of the spray rod fixing block, and the bottom casters are arranged vertically; A lateral wheel bracket (3) is arranged near the fixed block, the lateral wheel bracket has a block-shaped main body, the center rod and the lateral rod are inserted into the main body of the lateral wheel bracket and fixed, and side support wheels (5) are arranged on both sides of the main body of the lateral roller bracket, and the side support wheels are arranged horizontally; A material pipe joint (1) is fixed at the bottom of the lateral rod, the top of the lateral rod is bent outward at a bending angle of 15° to 30° and is connected to a side nozzle (6), the top of the central rod is connected to the spray rod (8) through a spray rod joint (7), a filter is arranged in the spray rod joint, and a mist nozzle (9) is movably connected to the end of the spray rod; After the strength test of the pressure stabilizing chamber unit is completed, the sandblasting and painting trolley enters from the open end of the pressure stabilizing chamber to sandblast and paint the inside of the pressure stabilizing chamber unit, and a brush is used to paint the inside of the air jet hole of the pressure stabilizing chamber; Multiple pressure-stabilizing chamber units are closed to form an integral pressure-stabilizing chamber. The sealing box at the end of the pressure-stabilizing chamber is opened, and a painting trolley enters from the sealing box to repaint the inside of the pressure-stabilizing chamber. After repainting, the watertight manhole cover and the sealing box are sealed.

2. A spraying method according to claim 1, characterized in that: The center rod and the lateral rod pass through the spray rod fixing block and are fixed to the spray rod fixing block by bolts.

3. A spraying method according to claim 1, characterized in that: The diameter of the spray boom is smaller than the diameter of the center rod, and the length of the spray boom is 0.15~0.2 times the length of the center rod.

4. A spraying method according to claim 1, characterized in that: The lateral rod starts to bend from the bottom to the top at 4 / 5 of its length.

5. A spraying method according to claim 1, characterized in that: The top of the spray boom fixing block is arc-shaped and the bottom is horizontal.

6. A spraying method according to claim 1, characterized in that: The side support wheels are located on the same horizontal plane as the center rod and the lateral rods.

7. A spraying method according to claim 1, characterized in that: The atomizing nozzles (9) around the front end are detachable and replaceable.

Images