Strength test tool for pressure stabilizing cavity

Abstract

A pressure stabilizing cavity strength test tool is provided with a strip-shaped pressing plate, a plurality of sealing plugs are arranged on the lower surface of the pressing plate at equal intervals, the pressing plate is matched with a plurality of C-shaped clamps at equal intervals, one free edge of each C-shaped clamp is shorter than the other free edge, a bolt is connected to the end of the long free edge of each C-shaped clamp, and the bolt penetrates through the free end of the long edge of each C-shaped clamp and abuts against the upper surface of the pressing plate; one side of the pressure stabilizing cavity unit is inserted into the C-shaped clamp, the pressing plate is pressed on an air injection hole of the pressure stabilizing cavity unit, the sealing plug is plugged into the air injection hole, the bolt is tightened, and the pressure stabilizing cavity unit and the pressing plate are clamped by the C-shaped clamp. According to the method, efficient building of a real ship is ensured, the functional requirement is met, the problem that the pressure stabilizing cavity is difficult to repair in the closing stage is solved, and the overall construction period is shortened to the maximum extent and the construction quality is improved in the segmented large-group stage installation process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ship gas drag reduction, and particularly relates to a pressure stabilizing cavity strength test tool. BACKGROUND

[0002] The ship gas drag reduction technology is a technology of reducing the surface frictional resistance of a ship by introducing air into the bottom of the ship during the running of the ship to form a stable gas lubricating layer. The ship gas layer drag reduction system comprises a gas supply system, a gas cavity and a gas injection hole. The gas injection hole is arranged on the ship bottom plate and is in communication with the gas cavity. When the ship runs, the gas supply system supplies gas into the gas cavity, and the gas in the gas cavity is injected out of the ship body through the gas injection hole to form a gas lubricating layer on the bottom of the ship body, which can reduce the resistance.

[0003] The bottom of the ship body is arranged with structures such as a pressure stabilizing cavity, a backing plate, a baffle, a gas cavity coaming and bow and stern fairing plates. The pressure stabilizing cavity is installed on the upper surface of the outer bottom plate, and stabilizes the air pressure during navigation and injects air into seawater to form a gas layer. The backing plate, the baffle, the gas cavity coaming and the bow and stern fairing plates are installed on the lower surface of the outer bottom plate to prevent the gas from escaping too quickly and maintain the flat bottom area of the ship and the stability of the gas layer.

[0004] In addition to meeting the normal ship body construction related specification rules, the ship with the gas layer drag reduction system also needs to meet the following functional requirements, including:

[0005] (1) The surface of the narrow space structure inside the pressure stabilizing cavity and the fairing plate needs to be painted and anticorrosive.

[0006] (2) The gas injection hole needs to be coated with a first anti-fouling paint.

[0007] (3) The pressure stabilizing cavity needs to be subjected to a pressure test, which is carried out at 1.5 times the maximum working pressure for 30 minutes without pressure change.

[0008] Therefore, using small unitized pressure stabilizing cavity units (such as the structure shown in Figure 1 ) instead of installation on large sections is a key technology for the application and construction of the gas layer drag reduction ship. Since the pressure stabilizing cavity is difficult to repair during the closing stage, the pressure stabilizing cavity strength test needs to be completed during the pressure stabilizing cavity unit manufacturing stage. After closing, only the strength test of the closed adjustment position is carried out. Therefore, a pressure stabilizing cavity strength test tool is invented. SUMMARY

[0009] To solve the above problems, the application provides a pressure stabilizing cavity strength test tool, which adopts the technical scheme of:

[0010] A kind of steady pressure chamber strength test tool, there is bar-shaped pressing plate, the lower surface of pressing plate is provided with multiple closed plugs at equal intervals, pressing plate is matched with multiple C-shaped cards at equal intervals, one free edge of C-shaped card is shorter than the other free edge, the end of long free edge of C-shaped card is connected with bolt, bolt passes through the long edge free end of C-shaped card, and is placed on the upper surface of pressing plate.

[0011] Steady pressure chamber unit is inserted into C-shaped card on one side, pressing plate is pressed on the air jet hole of steady pressure chamber unit, closed plug is inserted into air jet hole, and bolt is tightened, C-shaped card clamps steady pressure chamber unit and pressing plate.

[0012] The above-mentioned kind of steady pressure chamber strength test tool, further, the distance between adjacent two C-shaped cards is 1 meter.

[0013] The above-mentioned kind of steady pressure chamber strength test tool, further, closed plug is made of elastic material.

[0014] The present application ensures efficient construction of real ship and meets functional requirements, avoids the problem that steady pressure chamber is difficult to repair in the stage of closing, and shortens the overall construction period to the maximum extent when installing in the stage of large group of section, and improves construction quality. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is steady pressure chamber structure schematic diagram;

[0016] Figure 2 It is the structure schematic diagram of the present application;

[0017] Among them, 1-steady pressure chamber unit, 3-pressing plate, 4-bolt, 5-C-shaped card, 6-closed plug. DETAILED DESCRIPTION

[0018] The present application is further described in conjunction with the drawings.

[0019] As Figure 2 Shown in the drawing, a kind of steady pressure chamber strength test tool, there is bar-shaped pressing plate 3, the lower surface of pressing plate is provided with multiple closed plugs 6 at equal intervals, pressing plate is matched with multiple C-shaped cards 5 at equal intervals, the distance between adjacent two C-shaped cards is 1 meter, one free edge of C-shaped card is shorter than the other free edge, the end of long free edge of C-shaped card is connected with bolt 4, bolt passes through the long edge free end of C-shaped card, and is placed on the upper surface of pressing plate.

[0020] Steady pressure chamber unit 1 is inserted into C-shaped card on one side, pressing plate is pressed on the air jet hole of steady pressure chamber unit, closed plug is inserted into air jet hole, and bolt is tightened, C-shaped card clamps steady pressure chamber unit and pressing plate.

[0021] Place the welded pressure-stabilizing chamber unit between the C-shaped clamps. The lower side of the C-shaped clamp should not exceed the distance from the bottom plate boundary to the pressure-stabilizing chamber boundary. The furthest end of the upper side should be aligned with the opening on the bottom outer plate. First, use a sealing plug made of elastic material to block all the openings. Then, press the pressure plate onto the sealing plug, ensuring that the sealing plug does not pop out. Finally, fasten the pressure plate to the bottom outer plate with bolts. Place two C-shaped clamps at 1m intervals, with the C-shaped clamps 100mm~200mm away from the pressure plate boundary to prevent excessive pressure from causing the clamps to fail to hold.

[0022] After the pressure stabilizing chamber unit is fabricated, temporary sealing plates are welded to both ends of the pressure stabilizing chamber (for pressure stabilizing chamber units with sealing boxes, only one end is sealed; the other end is sealed with a manhole cover on the sealing box). Blind flanges are used to seal the side pipes, and sealing plugs are used to block the air vents on the outer bottom plate. C-clamps, bolts, and pressure plates are used to hold the sealing plug in place to prevent it from flying out during the strength test. Air is injected into the pressure stabilizing chamber at a test pressure of 3.3 bar, and the pressure is maintained for 30 minutes. After the strength test, the temporary sealing plates at the open end of the pressure stabilizing chamber are removed.

Claims

1. A pressure-stabilizing chamber strength testing fixture, characterized in that, There is a strip-shaped pressure plate, and multiple sealing plugs are evenly spaced on the lower surface of the pressure plate. Multiple C-shaped clips are evenly spaced on the pressure plate. One free side of the C-shaped clip is shorter than the other free side. A bolt is connected to the end of the long free side of the C-shaped clip. The bolt passes through the long free end of the C-shaped clip and presses against the upper surface of the pressure plate. Insert the C-type clip into one side of the pressure stabilizing chamber unit, press the pressure plate onto the air jet of the pressure stabilizing chamber unit, insert the sealing plug into the air jet, tighten the bolt, and the C-type clip will clamp the pressure stabilizing chamber unit and the pressure plate together.

2. The pressure-stabilizing chamber strength testing fixture according to claim 1, characterized in that, The distance between two adjacent C-type cards is 1 meter.

3. The pressure-stabilizing chamber strength testing fixture according to claim 1, characterized in that, The sealing plug is made of an elastic material.

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