Anti-winding device for ship tail shaft

Abstract

The utility model belongs to the technical field of shipbuilding, and particularly discloses a ship tail shaft anti-winding device which comprises a tail shaft, an anti-winding device and an anti-winding device. The movable blade is arranged on a propeller hub of the propeller and can cut sundries distributed in the axial direction of the tail shaft when rotating along with the propeller; the tail shaft bracket is sleeved on the tail shaft; the protective sleeve is connected to the stern shaft bracket in a sleeving manner; and the fixed blade is arranged on the protective sleeve in parallel to the central axis of the tail shaft and is used for cutting sundries distributed along the radial direction of the tail shaft. The movable blade and the fixed blade are combined to form two-stage cutting, entanglements can be fully cut into sections, foreign matters are actively removed, and a propeller and a tail shaft are effectively prevented from being wound by the foreign matters; the power of the movable blade directly comes from the propeller, a new power source is not needed, and the device is environment-friendly, practical and efficient; the fixed blade is installed on the stern shaft bracket through the protective sleeve, the protective sleeve can be fixed through a bolt or directly welded, and installation is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of shipbuilding, and particularly relates to a ship stern shaft anti-winding device. Background Art

[0002] The stern shaft is the last section of a ship's shafting, used to mount the propeller. One end of the stern shaft is connected to the propeller, and the other end is connected to the engine via a gearbox or coupling. On large ships, the stern shaft is typically mounted on two bearings: the stern bearing and the forward bearing. The stern bearing is in contact with the water, while the forward bearing connects to the engine room. While a ship is sailing, floating debris, fishing nets, cables, and other debris in the water can become entangled in the propeller and stern shaft, affecting or even damaging the propeller, leading to a loss of power and a serious accident.

[0003] At present, the commonly used methods for the technical problem of anti-entanglement of the stern shaft are mainly installing a protective cover and installing a cutting device. Although the method of isolating debris with a protective cover can prevent the stern shaft from being entangled, the debris will be entangled on the protective cover and cannot be eliminated, affecting the contact between the propeller and the water, and further affecting the navigation power of the ship; the method of cutting off the entangled debris by a cutting device can effectively prevent the stern shaft and propeller from being entangled, but it is necessary to consider the removal of axial and radial entanglements of the stern shaft at the same time. For example, in the anti-entanglement device of a ship propeller disclosed in patent CN201520077526.X, a tool is installed on the stern shaft, and the stern shaft drives the blade to cut the entangled debris. The movable blade structure of the patent can cut the axial entanglement, but the structure and installation method of the fixed blade cannot effectively guarantee the cutting effect. The entanglement passes through the blade almost tangentially and is not easy to be cut off. Instead, it may be entangled by debris.

[0004] In order to solve the problem that the blade cutting structure in the prior art has poor cutting effect on the axial and radial windings of the ship's stern shaft, it is necessary to provide a more reasonable technical solution to improve the structure of the anti-winding device to solve the current technical problem. Utility Model Content

[0005] The purpose of the utility model is to provide a ship stern shaft anti-entanglement device, which forms a two-stage cutting by combining a movable blade and a fixed blade, can fully cut the entangled object into sections, and actively remove foreign matter, effectively preventing the propeller and stern shaft from being entangled by foreign matter.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a ship stern shaft anti-winding device, comprising: a stern shaft, one end of which is fixedly connected to a propeller;

[0007] A moving blade is provided on the propeller hub so as to cut debris distributed along the axial direction of the stern shaft when rotating with the propeller;

[0008] a stern shaft frame, sleeved on the stern shaft;

[0009] A protective sleeve, sleeved on the stern shaft frame; and

[0010] A fixed blade is provided on the protective sleeve, and the blade of the fixed blade extends in a direction parallel to the central axis of the stern shaft, and is used for cutting debris distributed radially along the stern shaft.

[0011] In order to better implement the present invention, the installation of the moving blade is consistent with the dynamic balance of the propeller.

[0012] To better implement the present invention, the movable blade includes a positioning blade and a cutting blade. The positioning blade is an annular structure fixedly sleeved on the propeller hub; the cutting blade is provided with at least two pieces and is evenly spaced along the circumferential direction of the positioning blade.

[0013] In order to better realize the present invention, the outer edges of the positioning blade and the cutting blade are both cutting edges, and the cutting blade is provided with two symmetrical concave cutting edges.

[0014] In order to better implement the present invention, at least two fixed blades are provided, and both are triangular prism-shaped. The multiple fixed blades are parallel to the central axis of the protective sleeve and are evenly spaced along the circumferential direction of the protective sleeve.

[0015] In order to better implement the present invention, the three side surfaces of the fixed blade are all concave curved surfaces, and the contact surface between the fixed blade and the protective sleeve is formed as a concave surface so as to fit the protective sleeve.

[0016] In order to better implement the present invention, the edge of the fixed blade at one end close to the movable blade is formed into a smooth and curled shape.

[0017] In order to better implement the present invention, the fixed blade portion protrudes from the protective sleeve, and there is a gap between the fixed blade and the movable blade.

[0018] Beneficial effects:

[0019] The area between the propeller and the stern shaft frame is the most vulnerable position to entanglement by debris. The utility model forms a two-stage cutting by combining the movable blade and the fixed blade, which can fully cut the entangled objects into segments and actively remove foreign objects, effectively preventing the propeller and the stern shaft from being entangled by foreign objects; the movable blade is directly installed on the propeller hub, and the power comes directly from the propeller, without the need for an additional power source, which is green, environmentally friendly, practical and efficient; the fixed blade is installed on the stern shaft frame through a protective sleeve, and the protective sleeve can be fixed with bolts or directly welded, which is easy to install.

[0020] The utility model fixes the moving blade at the optimal position of the propeller hub by positioning the blade, so that it is highly consistent with the dynamic balance of the propeller and does not affect the propeller's propulsion efficiency; the outer edges of the positioning blade and the cutting blade are both set as cutting edges, and the cutting blades are set with symmetrical inwardly concave cutting edges, so that after the debris contacts the cutting edge, there will be a stuck action, as long as the entangled debris contacts the outer edges of the positioning blade and the cutting blade, it can be cut, and the cutting effect is fully guaranteed.

[0021] The utility model provides a triangular prism-shaped fixed blade, and sets the three side surfaces into inwardly concave curved surfaces, which can ensure the strength of the blade body and improve the sharpness of the blade edge, thereby making it easy to cut entangled objects; and the triangular prism-shaped fixed blade has a cutting edge in three directions, and the multiple fixed blades work together to have cutting edges in multiple directions, so that miscellaneous objects in different directions can be cut into segments.

[0022] The three edges of the triangular prism-shaped fixed blade of this utility model are arranged in a smoothly tilted structure, forming an inward-concave cutting edge. This causes debris to become stuck when it contacts the cutting edge, making it easier to cut compared to a straight cutting edge. Furthermore, as the propeller rotates and drives debris to be cut by the upturned cutting edge, the upturned curved cutting edge causes the debris to gradually move from the inside outward. At this point, the rotating force of the propeller further utilizes to fling the debris out and carry it away in the wake, thus achieving the effect of actively removing foreign matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the overall structural diagram of the anti-winding device of the utility model;

[0024] Figure 2 This is a side view of the overall structure of the anti-winding device of the utility model;

[0025] Figure 3 This is a structural diagram of the movable blade of the utility model;

[0026] Figure 4 This is a three-dimensional structural diagram of the protective sleeve and fixed blade of the utility model;

[0027] Figure 5 This is a structural diagram of the protective sleeve and fixed blade of the utility model from an axial perspective.

[0028] In the figure: 1, stern shaft; 2, propeller; 21, propeller hub; 3, moving blade; 31, positioning blade; 32, cutting blade; 4, stern shaft frame; 5, protective sleeve; 6, fixed blade. DETAILED DESCRIPTION

[0029] Example

[0030] like Figure 1 、 Figure 2As shown, a ship stern shaft anti-winding device includes: a stern shaft 1, one end of which is fixedly connected to a propeller 2;

[0031] The movable blade 3 is mounted on the hub 21 of the propeller 2 so as to cut debris distributed along the axial direction of the stern shaft 1 when the propeller 2 rotates;

[0032] The stern shaft frame 4 is sleeved on the stern shaft 1;

[0033] The protective sleeve 5 is sleeved on the stern shaft frame 4; and

[0034] The fixed blade 6 is provided on the protective sleeve 5 , and the blade of the fixed blade 6 extends in a direction parallel to the central axis of the stern shaft 1 , and is used for cutting debris distributed radially along the stern shaft 1 .

[0035] By combining the movable blade 3 and the fixed blade 6, a two-stage cutting is formed, which can fully cut the entangled objects into segments, effectively preventing the propeller 2 and the stern shaft 1 from being entangled by foreign objects; the movable blade 3 is directly mounted on the hub 21 of the propeller 2, and the power comes directly from the propeller 2, without the need for an additional power source, which is green, environmentally friendly, practical and efficient; the fixed blade 6 is mounted on the stern shaft frame 4 through the protective sleeve 5, and the protective sleeve 5 can be fixed with bolts or directly welded, which is convenient to install; specifically: when foreign objects are rolled up by the propeller 2 and form a rotational motion, they will be cut into segments by the fixed blade 6; and foreign objects distributed axially along the stern shaft 1 will be cut into segments by the movable blade 3 during the rotation process, and the movable blade 3 can follow the propeller 2 to rotate forward and reverse, thereby effectively reducing the risk of the stern shaft 1 being entangled.

[0036] Preferably, the installation of the moving blade 3 is in accordance with the dynamic balance of the propeller 2 .

[0037] By performing dynamic balancing correction on the moving blade 3, it is made to be highly consistent with the dynamic balance of the propeller 2, without affecting the propulsion efficiency of the ship at all.

[0038] Preferably, if Figure 3 As shown, the movable blade 3 includes a positioning blade 31 and a cutting blade 32. The positioning blade 31 is an annular structure fixedly sleeved on the hub 21 of the propeller 2; the cutting blade 32 is provided with at least two pieces and is evenly spaced along the circumferential direction of the positioning blade 31.

[0039] The moving blade 3 is fixed to the optimal position of the propeller 2 hub by positioning the blade 31, so that it is highly consistent with the dynamic balance of the propeller 2 and does not affect the propulsion efficiency of the propeller 2; a space is formed between the multiple cutting blades 32, and the debris distributed along the axial direction will pass through these spaces, which is more conducive to the rotating cutting knife to cut these debris in half.

[0040] The outer edges of the positioning blade 31 and the cutting blade 32 are both cutting edges, and the cutting blade 32 is provided with two symmetrical concave cutting edges.

[0041] By setting the outer edges of the positioning blade 31 and the cutting blade 32 as cutting edges, during high-speed rotation, as long as the entangled debris contacts the outer edges of the positioning blade 31 and the cutting blade 32, it can be cut. If a blunt edge that cannot be cut appears, it will inevitably be entangled again; when the debris contacts the straight cutting edge, it will inevitably slip and be difficult to be cut. However, the concave cutting edge will cause the debris to be stuck after contacting the cutting edge, making it easier to be cut off.

[0042] like Figure 4 and Figure 5 As shown, there are at least two fixed blades 6 , both of which are triangular prism-shaped, and the multiple fixed blades 6 are evenly spaced along the circumferential direction of the protective sleeve 5 .

[0043] Ordinary sheet-shaped knives are easily broken, and the triangular prism-shaped fixed blade 6 can enhance the strength of the blade body; and the debris will inevitably not make completely regular circular motion under the rotation of the propeller 2, and the triangular prism-shaped fixed blade 6 has cutting edges in three directions. The combined effect of multiple fixed blades 6 has cutting edges in multiple directions, so that the debris in different directions and in a disorderly manner can be cut into segments.

[0044] The three side surfaces of the fixed blade 6 are all concave curved surfaces, and the contact surface between the fixed blade 6 and the protective sleeve 5 is formed as a concave surface so as to fit the protective sleeve 5 .

[0045] A regular triangular prism, with its three edges being too angled, is not sharp enough during cutting, making it difficult to achieve the desired cutting effect. Therefore, the present invention provides a blade with three concave curved surfaces, ensuring both blade strength and sharpness, making it easier to cut through entangled materials. One of the curved surfaces is configured to have the same curvature as the protective sleeve 5, allowing the fixed blade 6 to be mounted more securely and reliably.

[0046] The edge of the fixed blade 6 at one end close to the movable blade 3 is formed in a smooth and curled shape.

[0047] According to the design principle of the same cutting blade 32, the upturned edge forms an inward-concave cutting edge, so that when debris contacts the cutting edge, it will be stuck and more easily cut off compared to a straight cutting edge.

[0048] Moreover, when the propeller 2 rotates and drives the debris to be cut by the upturned blade, the upturned arc-shaped blade will cause the debris to move gradually from the inside to the outside. At this time, the rotational force of the propeller 2 can be further utilized to throw the debris out and carry it away by the wake, thereby achieving the effect of actively removing foreign matter.

[0049] The fixed blade 6 partially protrudes from the protective sleeve 5 , and there is a gap between the fixed blade 6 and the movable blade 3 .

[0050] There is usually a certain distance between the propeller 2 and the stern shaft frame 4. Debris is most likely to be entangled in this distance. If entangled at this position, the operation of the propeller 2 will be affected the most directly. The fixed blade 6 is placed as close as possible to the movable blade 3, so that this distance most likely to be entangled is protected by the fixed blade 6. Once foreign matter is entangled, it will be cut into sections by the fixed blade 6 and the movable blade 3.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A ship stern shaft anti-winding device, characterized in that: include: A stern shaft (1), one end of which is fixedly connected to a propeller (2); A moving blade (3) is provided on the hub (21) of the propeller (2) so as to be able to cut debris distributed along the axial direction of the stern shaft (1) when rotating with the propeller (2); A stern shaft frame (4) is sleeved on the stern shaft (1); A protective sleeve (5) is sleeved on the stern shaft frame (4); and A fixed blade (6) is provided on the protective sleeve (5), and the blade of the fixed blade (6) extends in a direction parallel to the central axis of the stern shaft (1) and is used for cutting debris distributed radially along the stern shaft (1).

2. A ship stern shaft anti-winding device according to claim 1, characterized in that: The installation of the moving blade (3) is in accordance with the dynamic balance of the propeller (2).

3. A ship stern shaft anti-winding device according to claim 1, characterized in that: The movable blade (3) comprises a positioning blade (31) and a cutting blade (32); the positioning blade (31) is an annular structure fixedly sleeved on the propeller hub (21) of the propeller (2); and the cutting blade (32) is provided with at least two pieces and is evenly spaced along the circumferential direction of the positioning blade (31).

4. A ship stern shaft anti-winding device according to claim 3, characterized in that: The outer edges of the positioning blade (31) and the cutting blade (32) are both cutting edges, and the cutting blade (32) is provided with two symmetrical inwardly concave cutting edges.

5. A ship stern shaft anti-winding device according to claim 1, characterized in that: There are at least two fixed blades (6), both of which are in the shape of triangular prisms. The plurality of fixed blades (6) are evenly spaced along the circumferential direction of the protective sleeve (5).

6. A ship stern shaft anti-winding device according to claim 5, characterized in that: The three side surfaces of the fixed blade (6) are all concave curved surfaces, and the contact surface between the fixed blade (6) and the protective sleeve (5) is formed as a concave surface so as to fit the protective sleeve (5).

7. A ship stern shaft anti-winding device according to claim 1, characterized in that: The edge of the fixed blade (6) at one end close to the movable blade (3) is formed into a smooth and curled shape.

8. A ship stern shaft anti-winding device according to claim 1, characterized in that: The fixed blade (6) partially protrudes from the protective sleeve (5), and there is a gap between the fixed blade (6) and the movable blade (3).

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