LU503847B1

LU503847B1 - Airboat and manufacturing method therefor

Info

Publication number: LU503847B1
Application number: LU503847A
Authority: LU
Inventors: Lin Jia; Xiaodan Wang; Dandan Wang; Shu Wang; Zhongyang Zhang; Ye Tian
Original assignee: Fushun Fuyun Anyi Lifesaving Equip Co Ltd
Priority date: 2021-08-19
Filing date: 2022-07-08
Publication date: 2023-06-05
Also published as: WO2023020153A1; CN113525587A

Abstract

The invention discloses an airboat and a manufacturing method therefor. A hull is divided into a front cabin and an rear cabin. Side decks are disposed on both of left and right sides of the rear cabin. The front cabin is separated from the rear cabin by a front cabin closing plate on the rear of the front cabin. An integral buoyant body is disposed on a bottom and side walls inside the rear cabin, and the buoyant body is covered with a plurality of closing battens arranged from front to rear. A closing plate is formed by the closing battens, and the closing plate is closed together with the front cabin closing plate, an rear cabin stern plate and the side decks to form an accommodating cavity for the buoyant body. According to the airboat disclosed by the invention, the buoyant body is fully filled between a bottom plate of the hull and a U-shaped inner cabin plate by using an open box type spraying method, so that the bearing capacity of a cabin is improved.

Description

AIRBOAT AND MANUFACTURING METHOD THEREFOR

LU503847

Field

The present invention relates to an airboat, in particular to an airboat used for water rescue and provided with a hull filled with a buoyant body and a manufacturing method therefor.

Background

À water rescue airboat is mainly used for rescue work in complex water environments such as urban waterlogging, flash floods as well as ice breakup and drift. During work in such water areas where underwater environments are extremely complicated, it is inevitable that a hull may collide and be damaged. Once the hull is damaged and a water pump of the hull is incapable of discharging water in time, the entire boat will be in risk of sinking. Therefore, it is essential to perform sinking-resistant treatment on the water rescue airboat. Sinking resistance is not only one of important safety indexes for a boat, but also one of important safety indexes for the water rescue airboat.

At present, the sinking resistance of a boat is mainly achieved by using a method of a plurality of sealed buoyancy tanks. In recent years, the sinking resistance of a small boat is achieved by adopting a method for filling of a buoyant body. The buoyant body of the small boat mainly employs foam blocks, pontoons or polyurethane foam for filling. The polyurethane foam mainly employs pouring polyurethane foam for filling, and some boats are also filled by spraying foam.

However, due to constraints such as a limited filling space of the buoyant body in terms of the structure of the water rescue airboat, existing buoyant body filling methods for spraying of the polyurethane foam, the foam blocks, the pontoons have the defects of weak bonding between the hull and a filler, low space utilization, etc. An existing method for filling the pouring polyurethane foam has the defects of lower foam density, long reaction time and easily- deformable hull. Therefore, the existing methods for filling the buoyant body cannot meet design requirements for the buoyant body of the hull of the water rescue airboat.

Summary

An objective of the present invention is to provide an airboat which is novel and unique in structure, convenient to use and capable of achieving the full filling of a buoyant body. A specific technical solution is described as follows.

Provided is an airboat of which a hull is divided into a front cabin and an rear cabin. Side decks are disposed on both of left and right sides of the rear cabin. The front cabin is separated from the rear cabin by a front cabin closing plate on the rear of the front cabin. An integral buoyant body is disposed on a bottom and side walls inside the rear cabin, and the buoyant body is covered with a plurality of closing battens arranged from front to rear. The closing battens constitute a closing plate, and the closing plate is closed together with the front cabin closing 503847 plate, an rear cabin stern plate and the side decks to form an accommodating cavity for the buoyant body.

The present invention further provides a manufacturing method for the above-mentioned airboat, including the following steps: 1) additionally mounting a first closing batten in the rear cabin, and forming the backwards- opened accommodating cavity for the buoyant body by the closing battens, the front cabin closing plate and the side decks; 2) starting a polyurethane foaming machine to uniformly spray a layer of foaming agent with the thickness of 0.3 to 0.5 mm to a front wall of the accommodating cavity for the buoyant body; turning off the polyurethane foaming machine; and after the foaming agent is foamed and shaped, overlaying the next layer of foaming agent until a distance from the buoyant body formed by the foaming agent to an opening of the accommodating cavity is less than 2 cm; 3) additionally mounting the next closing batten, and repeating step 2) until contraction parts on tail ends of the side decks are left; 4) additionally mounting auxiliary closing battens that fill in the contraction parts in the side decks, and repeating step 2); 5) spraying the foaming agent layer by layer on the remaining bottom plate until the height of the foamed and shaped foaming agent is slightly less than the height of a bottom of each closing batten; 6) after the foaming agent is foamed and shaped, cutting off filled-in parts of the side decks, brushing the foaming agent on a surface of the buoyant body, and additionally mounting the last closing batten to completely close the buoyant body; 7) extruding the closing battens to the surface of the buoyant body by using a support and a heavy object to avoid the deformation of the closing battens; and 8) removing the support and the heavy object to complete the mounting of the buoyant body.

Further, the foaming agent is prepared by mixing a material A with a material B.

Further, each of a material A output pipe and a material B output pipe of the polyurethane foaming machine is provided with a flow regulating valve to control a ratio of the material A to the material B and a spray flow rate.

Further, the ratio of the material A to the material B is about 1: 1.05 to 1: 1.1.

Further, the spray flow rate is 3 - 5 kg/min.

Further, the polyurethane foaming machine has an air source pressure which is 0.5-0.8 MPa and an air flow which is greater than or equal to 0.9 m*/min.

Further, the foaming agent has a foam density which is greater than or equal to 45 kg/m?® and a foam water absorption which is less than or equal to 4%.

According to the airboat disclosed by the present invention, the buoyant body fully fills between the bottom plate of the hull and a U-shaped inner cabin plate by using an open box YP 503847 spraying method, so that the bearing capacity of a cabin is improved.

Brief Description of the Drawings

Fig. 1 is an analytical diagram showing a spraying solution;

Fig. 2 is a schematic diagram showing atomization of a spray gun;

Fig. 3 is a schematic diagram showing hull spraying; and

Fig. 4 is a diagram showing a flow direction of liquid after refitting.

In the drawings: 1, front cabin; 101, front cabin closing plate; 2, rear cabin; 201, rear cabin stern plate; 3, side deck; 4, closing batten; and 5, buoyant body.

Detailed Description of the Embodiments

The present invention will be more comprehensively described below with embodiments.

The present invention can be embodied in many different forms, but should not be understood as being limited to exemplary embodiments described herein.

For facilitating description, relative spatial terms such as “upper”, “lower”, “left” and “right” used herein are intended to describe a relative relationship between an element or feature and another element or feature shown in the drawings. It should be understood that the spatial terms are intended to include different orientations of an apparatus in use and operation in addition to orientations shown in the drawings. For example, if the apparatus in the drawings is inverted, an element described to be “below” other elements or features will be located “on” other elements or features. Therefore, the exemplary term “below” may include both of an above orientation and a below orientation. The apparatus can be located in other manners (rotated for 90 DEG or located on other orientations). The relative spatial description used herein can be correspondingly explained.

As shown in Fig. 1 and Fig. 3, a hull to be sprayed is placed in a paint spray room, closing plates are laid on an entire boat according to design requirements and a foam spraying position.

The closing plates cannot be fixed during laying, and the closing plates are numbered after being laid on the entire boat, thereby increasing the assembling speed. Then, the closing plates are taken out one by one for later use.

When the closing plates are additionally mounted, attention needs to be paid to the shaping of the closing plates. Since a space where foam is sprayed is an open space, no overhigh pressure is applied to surrounding closing plates in a foam spraying process, and the shapes of the closing plates are basically unchanged. Therefore, attention needs to be paid to mounting positions and sizes of the closing plates when the closing plates are mounted, thereby ensuring that the plurality of closing plates are mounted smoothly.

A U-shaped closing plate is fixed at a first section, and the U-shaped closing plate is connected and fixed with a front cabin closing plate as well as left and right decks. The width of the closing plate is 300 mm, and a position to be sprayed is shaped like an open box. LU503847

According to the calculation that a filling volume of a buoyant body is about 2 m°, it is estimated that used materials include 50 kg of material À and 55 kg of material B.

Device preparation: a refitted polyurethane foaming machine, and an air compressor which is required to have an air source pressure which is 0.5 - 0.8 MPa and an air flow = 0.9 m®min.

A nozzle of a spray gun can select a circular nozzle or a strip nozzle according to different spraying positions. Due to the adoption of the closing plate on a hull of an airboat, the spraying space is smaller, and the circular nozzle is selected. The nozzle is perpendicular to the closing plate of the hull to spray, and a distance from the nozzle to a spraying plane is determined according to a spray mist diffusion situation. As shown in Fig. 2 which is a schematic diagram showing atomization of a spray gun, a distance from a bottom plate of the boat to the U-shaped closing plate is about 200 mm, the width of spray mist is about 200 mm when the spray mist of the spray gun is at a distance about 500 mm from the spraying plane, and therefore, a distance from the spray gun to the spraying plane is about 500 mm.

The polyurethane foaming machine is started, and an air pump is started. After it is checked that machine parameters enable normal operation, the air pump is connected to the machine. À foaming agent adopts a foaming agent in the prior art. For example, composite polyether is selected as the material A, and isocyanate is selected as the material B. À temperature control system is started according to an actual temperature, wherein the temperature of the material B is 35°C, the temperature of the material A is 25°C and the temperature of a pipeline is 30°C. An entire reading of an air pressure gauge of the device is greater than or equal to 0.6 MPa, and a reading of a hydraulic gauge of the pipeline of the spray gun is greater than or equal to 2.0 MPa.

A spray flow rate of the device is regulated to be 3 to 5 kg/min, and preferably, 4 kg/min. Spraying can be performed when device parameters meet spraying conditions (the air temperature is about 25°C).

In the north where the temperature is lower, the temperature of the material B is regulated to 35°C, the temperature of the material A is regulated to 35°C, and the temperature of the pipeline is controlled at 40°C. At the same time, raw materials in a material barrel are required to be heated. The temperatures of the raw materials are kept at about 30°C by heating through heating bands or water. If an environmental temperature is extremely low, spraying is not suggested.

Each of two output pipes of the foaming machine is connected to a flow regulating valve for regulating a mixing ratio of the two materials. As shown in Fig. 4, the flow regulating valve can adopt an adjustable flow divider, and a part of material returns to the material barrel by flow division to achieve flow regulation. The material returning from the adjustable flow divider can promote the flowing of the materials in the material barrel, so that the materials are more uniform.

A mixed spraying ratio of the material A to the material B is regulated. As shown in a diagram showing flow directions of materials, the flow divider for the material A is regulated so that a ratio of the returned material A to the sprayed material A is 1 : 9. The flow divider for the material B IS Us03847 regulated, and a return valve for the material B is switched off, so that no material B returns. A ratio of the material A to the material B at the spray gun is approximately 1 : 1.1. The ratio of the material B is slightly higher, which can ensure that sprayed polyurethane foam is higher in 5 hardness. After the flow dividers are subjected to ratio regulation, experimental spraying is performed. The hardness of the sprayed foam is observed, and after reaction heat of the foam is completely dissipated, the foam is pressed with hands, and if there is no obvious deformation on the foam and there is a rigid plastic feeling during pressing, the design requirement can be basically met. When the hardness of the foam is low, the flow divider for the material A is regulated to increase the return flow of the material A, and reduce the spraying amount of the material A, and the spraying amount of the material B is kept unchanged, so that the hardness of the foam is improved. When the foam is pulverized, the flow divider for the material B is regulated to increase the return flow of the material B, and reduce the spraying amount of the material B, and the spraying amount of the material A is kept unchanged, so that the hardness of the foam is lowered.

The buoyant body on the bottom plate of the boat is sprayed. Firstly, a polyurethane material that is unfoamed after being heated on a front end in a charging pipe is sprayed out. Sample spraying is performed after a foam gun has stable spray mist. The hardness of the sprayed foam is checked after the foam is stabilized and cooled, and the flow dividers are regulated to make the hardness of the foam meet a spraying requirement. Then, the hull is sprayed, wherein the one-time spraying thickness is 0.3 - 0.5 mm, and the thickness after foaming is 10 mm - 15 mm.

If the one-time spraying thickness is extremely large, the hardness of the foam can be low, and if the thickness of the foam is extremely small, insufficient foaming can be caused, and the weight can be increased. During spraying, a moving speed of the nozzle is about 0.5 - 0.8 m/s.

When the buoyant body is foamed, layer-by-layer spraying is performed after the foaming is stably initiated. During spraying, the hull is tightly filled and fully sprayed, and gaps are not allowed to be present.

As shown in Fig. 2, when the bottom of the boat is sprayed with the buoyant body, the spray gun is aligned to the backwards-opened accommodating cavity defined by the U-shaped closing plate and the hull such that the spray gun is perpendicular to the front cabin closing plate of the boat to spray. During spraying, a spraying position is the bottom of the hull while the position of a human body is relatively higher than the spraying position, which tends to cause insufficient spraying of a bottom surface of the U-shaped closing plate during spraying, and therefore, the nozzle of the spray gun is slightly upward during spraying to ensure that no gaps are present in the spraying space. The foam is sprayed in a narrow and elongated closed space, and may release a great deal of heat after reaction. The foam will react to release heat during spraying on each layer, so that the strength of the sprayed foam is guaranteed. During spraying, the nozzle is enabled to move in parallel for spraying, so that the foam is sprayed smoothly. After spraying,

the spray gun will not be aligned to unfoamed foam because an air flow of the spray gun will blow 503847 away the foam which is being defoamed.

A closing plate at a first section is sprayed with the foam according to the spraying requirement.

After the first section is to be fully sprayed, a certain distance is properly left and is not sprayed. A joint of the U-shaped closing plate is cleaned, a closing plate at a second section is additionally mounted after cleaning, and the closing plate at the second section is tightly fitted to and is level to the closing plate at the first section without gaps when being additionally mounted.

Further spraying is performed after the closing plate at the second section is additionally mounted and fixed. In this spraying manner, the two sections of closing plates can be better bonded together by the foam, so that the closing plates are firmer and good in integrality. The rest can be done in the same manner until the second-to-last section is sprayed.

When the last section is sprayed, it is only necessary to form the buoyant body on the bottom.

Therefore, firstly, the foam needs to be sprayed downwards to the bottom of the rear cabin, and the foam is shaped after being fully sprayed, so that a gap which is about 1 mm is left between the buoyant body and the closing batten at the last section. After shaping, an exposed surface of the buoyant body is brushed with a foaming agent, and after brushing, the closing plate at the last section is rapidly mounted and fixed and is tightly pressed by using a flat heavy object, thereby preventing the phenomenon that pouring foam is foamed to cause the deformation of the closing plate at the last section. After the pouring foam is completely foamed, the heavy object is removed, and the foam excluded from the gap is cleaned.

Spraying the buoyant body for the entire boat is completed.

In order to provide a larger operation space for a driver, side decks 3 may not extend to an rear cabin stern plate 201, and contraction parts gradually contracting are disposed on rear parts of the side decks 3.

In this case, an auxiliary closing batten provided with a horizontal top surface needs to be disposed and cooperates with top surfaces of the contraction parts to form an accommodating cavity having the same shape as above. At the moment, layer-by-layer spraying is performed according to a spraying manner of the first section to form the buoyant body. After the foaming agent is shaped, redundant parts are cut off, and the closing battens corresponding to the contraction parts are mounted.

It can be decided whether to extend the buoyant body to a bottom between a tail end of each of the side decks 3 and the rear cabin stern plate 201 as required. If the buoyant body extends, processing can be performed according to the foregoing spraying method for the last section.

For the hull manufactured by using the above-mentioned method, the entire buoyant body is formed on the bottom of the rear cabin and below the side decks, and firm seamless connection between the buoyant body and the hull can be achieved. When the hull is damaged, water can be prevented from entering between the buoyant body and the hull or entering the buoyant body,

thereby giving full play to the effect of the buoyant body. By contrast, it is very difficult for a poured 03847 buoyant body and hull to achieve seamless connection, and water is very difficult to discharge in time once entering the buoyant body or a gap between the buoyant body and the hull, which affects the effect of the buoyant body.

A front cabin 1 and an rear cabin 2 of the hull are separated by a front cabin closing plate 101. The buoyant body 5 is disposed in the rear cabin 2. In order to enable the buoyant body 5 to be wirelessly and fixedly connected to the accommodating cavity for the buoyant body in the rear cabin 2, the closing plate forming the accommodating cavity for the buoyant body in the rear cabin 2 is formed by splicing a plurality of closing battens 4, which facilitates sectional construction to form the entire buoyant body 5. The foaming agent for forming the buoyant body 5 has viscidity and can firmly bond the buoyant body 5 with an inner wall of the accommodating cavity for the buoyant body, so that water can be prevented from entering the accommodating cavity for the buoyant body while the buoyant body is prevented from being separated from the hull, and sufficient buoyancy can be provided for the airboat even if the surface of the hull is damaged, which provides sufficient safety guarantee for recuse.

The technical solution provided by the present invention has the following beneficial effects: 1. According to the present invention, the blank in domestic water rescue airboats without buoyant bodies is filled, and the sinking resistance and safety of the water rescue airboats are improved. 2. The foam filing method for the hull of the airboat provided by the present invention overcomes the defects of low foaming space utilization, incomplete filling and poor bearing capacity of the hull. The method not only can be used for filling of the buoyant body in the hull of the airboat, but also can be used for filling of buoyant bodies in other boats. 3. By additionally mounting the flow dividers in the present invention, the material A and the material B are mixed according to different ratios for spraying, such that the hardness of the foam and the gap of the foam are more rapidly and conveniently regulated. 4. By filling the foam in the hull of the airboat in the present invention, the entire strength of the hull is improved, and the airboat can still be slowly pulled in to shore even if the hull is damaged accidentally to cause a phenomenon that a great deal of water leaks. 5. By using the open box type spraying method in the present invention, the foam does not generate a compressive stress on the hull, and the entire boat is smooth inside and outside and does not deform after being sprayed. 6. By using the open box type spraying method in the present invention, the filling space for the buoyant body of the hull of the airboat is more sufficiently utilized. 7. According to the present invention, spraying is performed in the open box, and the foaming spray mist is completely foamed in the open box, so that there is no waste caused by external ejection or waste caused by shaping irregular shapes after spraying, the raw materials are saved, and the economic efficiency is increased.

8. By using the open box type spraying method in the present invention, a space between 8 1503847 bottom plate of the hull and a U-shaped inner cabin plate is fully filled, and at the same time, the high-density foaming agent is selected to be sprayed, so that the bearing capacity in a cabin is greatly improved. A safe and reliable platform is provided for loading cargos and mounting a device in the airboat. 9. By using the open box type spraying method in the present invention, original manpower and material resource wastes caused by subsequent supplementary filling due to incomplete foaming and caused by cut-off for shaping are reduced, so that the work efficiency of filling the buoyant body is increased.

The above-mentioned examples are merely intended to describe the present invention. In addition, there are still many different implementations that can be envisioned by those skilled in the art after they comprehend the concept of the present invention. Therefore, the implementations will not be listed one by one herein.

Claims

1. An airboat, a hull of the airboat is divided into a front cabin and an rear cabin, characterized in that side decks are disposed on both of left and right sides of the rear cabin, the front cabin is separated from the rear cabin by a front cabin closing plate on the rear of the front cabin, an integral buoyant body is disposed on a bottom and side walls inside the rear cabin, and the buoyant body is covered with a plurality of closing battens arranged from front to rear, the closing battens constitute a closing plate, and the closing plate is closed together with the front cabin closing plate, an rear cabin stern plate and the side decks to form an accommodating cavity for the buoyant body.

2. A manufacturing method for the airboat according to claim 1, characterized in that the following steps are included: 1) additionally mounting a first closing batten in the rear cabin, and forming the backwards-opened accommodating cavity for the buoyant body by the closing battens, the front cabin closing plate and the side decks; 2) starting a polyurethane foaming machine to uniformly spray a layer of foaming agent with the thickness of 0.3 to 0.5 mm to a front wall of the accommodating cavity for the buoyant body; turning off the polyurethane foaming machine; and after the foaming agent is foamed and shaped, overlaying the next layer of foaming agent until a distance from the buoyant body formed by the foaming agent to an opening of the accommodating cavity is less than 2 cm; 3) additionally mounting the next closing batten, and repeating step 2) until contraction parts on tail ends of the side decks are left; 4) additionally mounting auxiliary closing battens that fill in the contraction parts in the side decks, and repeating step 2); 5) spraying the foaming agent layer by layer on the remaining bottom plate until the height of the foamed and shaped foaming agent is slightly less than the height of a bottom of each closing batten; 6) after the foaming agent is foamed and shaped, cutting off filled-in parts of the side decks, brushing the foaming agent on a surface of the buoyant body, and additionally mounting the last closing batten to completely close the buoyant body.

3. The manufacturing method according to claim 2, characterized in that the foaming agent is prepared by mixing a material À with a material B.

4. The manufacturing method according to claim 2, characterized in that each of a material A output pipe and a material B output pipe of the polyurethane foaming machine is provided 03847 with a flow regulating valve to control a ratio of the material A to the material B and a spray flow rate.

5. The manufacturing method according to claim 4, characterized in that the ratio of the material A to the material B is about 1 : 1.05 to 1: 1.1.

6. The manufacturing method according to claim 4, characterized in that the spray flow rate is 3 - 5 kg/min.

7. The manufacturing method according to claim 2, characterized in that the polyurethane foaming machine has an air source pressure which is 0.5 - 0.8 MPa and an air flow which is greater than or equal to 0.9 m*/min.

8. The manufacturing method according to claim 2, characterized in that the foaming agent has a foam density which is greater than or equal to 45 kg/m® and a foam water absorption which is less than or equal to 4%.