Blade hoisting tool for controllable-pitch propeller

Abstract

The utility model provides a blade hoisting tool for a controllable-pitch propeller. The blade hoisting tool comprises a vertical frame, a first transverse frame and a second transverse frame, the first transverse frame and the second transverse frame are mounted in parallel in parallel in the perpendicular bisector direction of the vertical frame, and the horizontal length of the first transverse frame is larger than that of the second transverse frame; an inner space formed by the vertical frame, the first transverse frame and the second transverse frame can realize positioning of propeller blades; the roots of the propeller blades are placed below the second transverse frame, the first transverse frame is placed on the lower middle portion of the propeller blades, and the top of the vertical frame is higher than the tops of the propeller blades. The novel paddle hoisting tool can improve the safety of constructors, is high in adaptability, reduces the cost and saves the ship maintenance time.

Description

Technical Field

[0001] This utility model relates to the field of installation and maintenance of marine adjustable pitch propellers, specifically, to a propeller blade hoisting tool for adjustable pitch propellers. Background Technology

[0002] With the development of shipbuilding technology, most ship owners have begun to choose advanced controllable pitch propellers, including azimuth and side thrusters. Most propeller blades currently on the market are made of copper alloy or stainless steel, which are heavy and pose certain safety risks during blade assembly and disassembly.

[0003] Current technology typically uses ordinary lifting slings for hoisting. However, because propeller blades are irregularly shaped objects with curved surfaces, and adjustable-pitch propeller blades can weigh anywhere from 200 kg to approximately 5000 kg, finding the center of gravity during hoisting is difficult. The blade's bottom flange cannot be kept level during hoisting, posing challenges to installation when it comes into contact with the hub flange. After the blade is hoisted above the hub flange, the lifting slings must be loosened before the bolts can be installed, posing a safety risk. Furthermore, the irregular shape of the blade makes it prone to tipping over during hoisting, requiring multiple attempts to adjust the lifting slings, which also risk detachment. These factors increase the risk of accidents, ranging from equipment damage to personal injury or death.

[0004] Currently, most shipyards operate on a subcontracting system during construction, resulting in a wide range of unqualified construction workers. This can lead to issues such as the use of substandard or unqualified lifting slings, increasing the risk of safety accidents. Furthermore, when large propeller blades need to be disassembled or assembled, suitable lifting slings are often difficult to find, requiring shipyards to customize them. This can impact construction schedules, extend repair times, and cause inconvenience to shipowners. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a tool for lifting the blades of an adjustable-pitch propeller. This tool eliminates the need for blade removal using existing techniques, increases worker safety, reduces financial burdens for ship owners and shipyards, saves ship maintenance time, reduces equipment wear and tear, extends equipment lifespan, and minimizes personnel requirements.

[0006] According to the present invention, an adjustable pitch propeller blade hoisting tool includes a vertical frame, a first transverse frame, and a second transverse frame.

[0007] The first transverse frame and the second transverse frame are installed side by side in parallel along the vertical line of the vertical frame, and the horizontal length of the first transverse frame is longer than that of the second transverse frame.

[0008] The internal space formed by the vertical frame, the first transverse frame, and the second transverse frame can achieve the positioning of the propeller blades.

[0009] The root of the propeller blade is placed below the second transverse frame, the first transverse frame is placed slightly below the middle of the propeller blade, and the top of the vertical frame is higher than the top of the propeller blade.

[0010] Furthermore, a lifting shackle is provided above the vertical frame.

[0011] Furthermore, the lengths of the first transverse frame and the second transverse frame are determined according to the size of the propeller blades.

[0012] Furthermore, the vertical distance between the first and second transverse frames can cover the center of gravity area of ​​the propeller blades.

[0013] Furthermore, the vertical frame, the first transverse frame, and the second transverse frame are all constructed by fixing two curved metal strips together with bolts to form the corresponding frame structure.

[0014] Furthermore, the lifting shackle can support more than 1.5 times the weight of the propeller blade.

[0015] Furthermore, the second transverse frame is installed at the bottom of the vertical frame.

[0016] Furthermore, the center of gravity zone is the zone between 0.6R and 0.4R of the propeller blade.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This lifting tool is suitable for blades of different sizes, and the required materials can be selected locally, as the properties of marine-grade steel plates can largely meet the lifting requirements of blades. Shipowners and shipyards do not need to customize lifting slings, and the safety risks caused by the construction party using inferior lifting slings are also avoided.

[0019] 2. This lifting tool is also reusable. Ship owners and shipyards can make one and use it multiple times in future maintenance, which greatly improves economy and efficiency.

[0020] 3. This lifting tool is designed to cover the blade's center of gravity. The blade can be leveled in one go, eliminating the need for multiple adjustments. It also avoids the possibility of slings slipping and tipping over, greatly improving construction safety. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the paddle hoisting tool of this utility model;

[0023] Figure 2 This is a schematic diagram of the paddle hoisting tool of this utility model from another angle;

[0024] Figure 3 This is a schematic diagram of propeller blades with diameters of 0.6R and 0.4R.

[0025] The diagram shows: 10 vertical frame, 20 first transverse frame, 30 second transverse frame, and 11 lifting shackle. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0027] like Figures 1-2 As shown, this utility model provides a blade hoisting tool for an adjustable pitch propeller, including a vertical frame 10, a first horizontal frame 20, and a second horizontal frame 30; the first horizontal frame 20 and the second horizontal frame 30 are installed side by side in parallel along the vertical axis of the vertical frame 10, and the horizontal length of the first horizontal frame 20 is longer than that of the second horizontal frame 30; the internal space formed by the vertical frame 10, the first horizontal frame 20, and the second horizontal frame 30 can achieve the positioning of the propeller blade; the root of the propeller blade is placed below the second horizontal frame 30, the first horizontal frame 20 is placed slightly below the middle of the propeller blade, and the top of the vertical frame 10 is higher than the top of the propeller blade.

[0028] Specifically, a lifting shackle 11 is installed on the top of the vertical frame 10, capable of supporting approximately 1.5 times the weight of the propeller blades. The lifting shackle 11 is fixed to the bolt holes at the top of the vertical frame 10. The lengths of the first transverse frame 20 and the second transverse frame 30 are determined according to the size of the propeller blades.

[0029] like Figure 3As shown, the vertical distance between the first transverse frame 20 and the second transverse frame 30 can cover the center of gravity area of ​​the propeller blade. Preferably, the center of gravity area is the distance between 0.6R and 0.4R of the propeller blade. The horizontal length of the first transverse frame 20 can cover the horizontal width of the upper blade within the center of gravity area of ​​the propeller blade. Preferably, the upper blade within the center of gravity area is the horizontal width at 0.6R of the propeller blade. The horizontal length of the second transverse frame 30 can cover the horizontal width of the lower blade within the center of gravity area of ​​the propeller blade. Preferably, the lower blade within the center of gravity area is the horizontal width at 0.4R of the propeller blade.

[0030] The vertical frame 10, the first transverse frame 20, and the second transverse frame 30 can all be constructed by bolting two curved metal strips together to form the corresponding frame structure. The metal strips can be made of flat steel, and the tensile strength and yield strength of the flat steel must exceed the lifting weight of the blade. 10.9 grade bolts with an outer thread diameter of 16mm should be selected.

[0031] The specific work method is as follows:

[0032] 1. Material Preparation: Prepare flat steel bars of different sizes according to the different blade sizes, for constructing the vertical frame 10, the first transverse frame 20, and the second transverse frame 30. The tensile strength and yield strength of the flat steel bars must exceed the lifting weight of the blade. Select four 10.9 grade bolts with an outer diameter of 16mm. Prepare a lifting shackle 11 that is 1.5 times the weight of the blade.

[0033] 2. Measure the length and height spacing d at 0.6R and 0.4R of the blade.

[0034] 3. Draw the blueprints based on the data obtained in the above steps, and have them fabricated on-site by shipyard workers. Fabricate the first transverse frame 20 to a length of 0.6R for the propeller blade, and the second transverse frame 30 to a length of 0.4R for the propeller blade. Install the second transverse frame 30 at the bottom of the vertical frame 10, and install the first transverse frame 20 at a position d away from the bottom of the vertical frame 10.

[0035] 4. Using the materials prepared above, install the tooling onto the blades; two bolt holes are respectively made at both ends of the two flat steels of the first transverse frame 20 and the second transverse frame 30, and fixed with the selected bolts. One bolt hole is made at the top of the vertical frame 10, and fixed with the selected lifting shackle 11.

[0036] This tool is suitable for propeller blades of various sizes, allowing shipyards to select materials locally, as marine-grade steel plates generally meet the lifting requirements for propeller blades. Shipowners and shipyards no longer need to customize lifting slings, avoiding the safety risks associated with contractors using substandard slings. Furthermore, the tool is reusable; a single tool can be reused multiple times in subsequent maintenance, significantly improving economy and efficiency.

[0037] Since the blade's center of gravity is typically between 0.4R and 0.6R, this fixture is designed to precisely cover this area. It allows for one-time blade leveling, eliminating the need for multiple adjustments. Furthermore, it avoids the possibility of slippage and tipping over that can occur with slings, significantly improving construction safety.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A blade hoisting tool for an adjustable pitch propeller, characterized in that, It includes a vertical frame (10), a first transverse frame (20), and a second transverse frame (30); The first transverse frame (20) and the second transverse frame (30) are installed side by side in parallel along the vertical line of the vertical frame (10), and the horizontal length of the first transverse frame (20) is longer than that of the second transverse frame (30). The internal space formed by the vertical frame (10), the first transverse frame (20), and the second transverse frame (30) can realize the positioning of the propeller blades. The root of the propeller blade is placed below the second transverse frame (30), the first transverse frame (20) is placed slightly below the middle of the propeller blade, and the top of the vertical frame (10) is higher than the top of the propeller blade.

2. The blade lifting tool according to claim 1, characterized in that, A lifting shackle (11) is provided above the vertical frame (10).

3. The blade lifting tool according to claim 1, characterized in that, The lengths of the first transverse frame (20) and the second transverse frame (30) are determined according to the size of the propeller blades.

4. The blade lifting tool according to claim 1, characterized in that, The vertical distance between the first transverse frame (20) and the second transverse frame (30) can cover the center of gravity action area of ​​the propeller blade.

5. The blade lifting tool according to claim 1, characterized in that, The vertical frame (10), the first horizontal frame (20), and the second horizontal frame (30) are all fixed into corresponding frame structures by two curved metal strips with bolts.

6. The blade lifting tool according to claim 2, characterized in that, The lifting shackle (11) can bear more than 1.5 times the weight of the propeller blade.

7. The blade lifting tool according to claim 1, characterized in that, The second transverse frame (30) is installed at the bottom of the vertical frame (10).

8. The blade lifting tool according to claim 4, characterized in that, The center of gravity zone is the zone between 0.6R and 0.4R of the propeller blade.

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