Propeller protection device

Abstract

The invention relates to the technical field of amphibious landing boats, and discloses a propeller protection device which comprises a protection shell wrapping a propeller, a spiral shaft and the periphery of a full-support rudder, the protection shell comprises a shaft sleeve shell, a flow guide shell and a propeller periphery shell, the shaft sleeve shell wraps the periphery of the spiral shaft, and the flow guide shell is arranged on the periphery of the propeller. Flow inlet holes are symmetrically formed in the shaft sleeve shell with the spiral shaft as the axis, the flow guide shell wraps the periphery of the connecting position of the spiral shaft and the propeller, flow guide holes are symmetrically formed in the position, at the center height of the spiral shaft, of the flow guide shell, and the flow guide shell is connected between the shaft sleeve shell and the propeller periphery shell in a linear transition reducing mode from the shaft sleeve shell to the propeller periphery shell. The periphery of the propeller is wrapped with the propeller periphery shell, flow drainage holes are symmetrically formed in the propeller periphery shell with the propeller as the axis, the shaft sleeve shell, the flow guide shell and the propeller periphery shell are connected into a whole in the extending direction of the spiral shaft, and the sides, facing the bottom of the ship body, of the shaft sleeve shell, the flow guide shell and the propeller periphery shell are open. According to the invention, the propeller, the screw shaft and the full-support rudder can be physically protected.

Description

Technical Field

[0001] This invention relates to the field of amphibious landing craft technology, and in particular to a propeller protection device. Background Technology

[0002] When amphibious landing craft conduct landing operations, they need to beach themselves and retreat. During this process, they are susceptible to damage to propellers and rudder jamming due to various obstacles in the mudflats and shallow waters. Since propeller and rudder malfunctions directly affect the mission performance of amphibious landing craft, it is necessary to protect the propellers and rudder equipment.

[0003] However, existing amphibious landing craft lack sufficient protection for propellers and rudder equipment, relying mainly on manual emergency handling, which affects the efficiency of amphibious landing craft in round-trip transportation. Summary of the Invention

[0004] This invention provides a propeller protection device that can physically protect the propeller, propeller shaft, and full-support rudder while minimizing the impact on water flow.

[0005] This invention provides a propeller protection device, comprising:

[0006] A protective casing surrounding the propeller, propeller shaft, and all-support rudder, wherein the protective casing includes:

[0007] The bushing housing is wrapped around the outer circumference of the spiral shaft, and the bushing housing has inlet holes symmetrically opened about the spiral shaft as an axis.

[0008] The flow guide shell is wrapped around the outer circumference where the propeller shaft and the propeller meet. The flow guide shell has symmetrical flow guide holes at the center height of the propeller shaft. The flow guide shell is connected between the shaft sleeve shell and the propeller circumference shell in a straight transition diameter form.

[0009] The propeller circumferential shell, which surrounds the propeller and the fully support rudder, has vent holes symmetrically opened about the propeller axis. The bushing shell, the guide shell, and the propeller circumferential shell are connected as one unit along the extension direction of the propeller shaft. The bushing shell, the guide shell, and the propeller circumferential shell are open to the side facing the bottom of the hull.

[0010] Optionally, it also includes a movable panel that can be closed onto the side of the protective hull near the stern plate, the movable panel including:

[0011] The top grid plate is connected to the stern plate at the first end.

[0012] Multiple central grid panels are hinged together in sequence, with the first end of the topmost central grid panel hinged to the second end of the top grid panel.

[0013] The bottom grid plate has its first end hinged to the second end of the middle grid plate located at the bottom.

[0014] The towing component is connected in sequence to the top grid plate, the middle grid plate and the bottom grid plate. One end of the towing component extends out of the top grid plate. By pulling the towing component toward the stern plate, the bottom grid plate and the middle grid plate will fold toward the stern plate. There are flow holes on the top grid plate, the middle grid plate and the bottom grid plate.

[0015] Optionally, one-way hinges are installed between the top grid plate and the middle grid plate, between multiple middle grid plates, and between the middle grid plate and the bottom grid plate. The one-way hinges are used to control the folding direction.

[0016] Optionally, the fully supported rudder includes a rudder stock that extends out of the hull, with an anti-jamming assembly attached to the rudder stock. The anti-jamming assembly can cut off objects that become entangled in the water when they become entangled in the rudder stock.

[0017] Optional anti-jamming components include:

[0018] The first actuator is fixed to the upper fin;

[0019] A reciprocating rod is connected to a drive unit. A wear-resistant block is connected to the reciprocating rod. The wear-resistant block is located between the upper fin and the rudder plate. The first drive unit drives the reciprocating rod to move back and forth so that the wear-resistant block moves back and forth along the gap between the upper fin and the rudder plate.

[0020] Optionally, it also includes a reverse obstacle-breaking device, which includes a auger bit. By symmetrically arranging the auger bit at the stern, if an obstacle blocks the stern during the ship's reverse movement, the auger bit can break through the obstacle or push it into the mud, allowing the ship to pass over the obstacle.

[0021] Optionally, the retreat obstacle-breaking device includes:

[0022] The support base is fixedly connected to the stern plate. A second drive is connected to the support base, which provides power and control signals to the second drive.

[0023] The obstacle-breaking reamer is connected to the second actuator, which can drive the obstacle-breaking reamer to retract into the support for protection.

[0024] Optionally, the obstacle-breaking reamer includes a cutter head and a multi-stage telescopic rod connected to the cutter head. The multi-stage telescopic rod is connected to a driver so that the multi-stage telescopic rod extends and retracts in stages, thereby causing the cutter head to extend or retract into the carrier.

[0025] Optionally, a purging system may also be included, which uses high-pressure air to blow away any obstructions entangled within the protective housing.

[0026] Optional, the purging system includes:

[0027] The control cabinet is installed in the stern compartment.

[0028] Auxiliary gas cylinder, installed in the stern compartment;

[0029] A vertical air tube, with its upper end connected to an auxiliary air tank;

[0030] The longitudinal air tube extends along the bottom plate of the ship and is connected at one end to the lower end of the vertical air tube.

[0031] The front-mounted nozzle is installed at the bottom of the ship and is raised. The front-mounted nozzle is adjacent to the bushing housing and the nozzle nozzle faces downward.

[0032] The rear nozzle is installed at the bottom of the ship and raised. The rear nozzle is adjacent to the propeller circumference shell and the nozzle of the rear nozzle is horizontal. The front nozzle and the rear nozzle are connected to the longitudinal air pipe.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] This invention provides a propeller protection device that protects the propeller shaft through a bushing shell, the propeller itself through a blade circumferential shell, and the connection between the propeller shaft and the propeller through a flow guide shell, thus providing all-around protection for the propeller. It also protects the full-support rudder within the protective shell. The bushing shell, flow guide shell, and blade circumferential shell are sequentially provided with inlet holes, flow guide holes, and outlet holes, allowing water to enter the propeller through these holes, ensuring propeller flow and balancing physical protection with smooth water flow. This ensures that the propeller's normal propulsion is not affected by the flow. Since the flow guide holes in the bushing shell are along the water flow direction, the flow rate is limited. By designing the flow guide shell as a straight transition diameter type, i.e., a trumpet-shaped transition, the opening faces the water flow direction, allowing for a larger flow rate. This reduces the impact of the protective shell and provides all-around protection for the propeller, propeller shaft, and full-support rudder. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural schematic diagram of a propeller protection device provided in an embodiment of the present invention;

[0036] Figure 2 A side view of a propeller protection device provided in an embodiment of the present invention;

[0037] Figure 3 This is a bottom view of a propeller protection device provided in an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the movable plate provided in an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of the fully supported rudder provided in an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the anti-jamming and anti-pulling component provided in an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of the retreat obstacle-breaking device provided in an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the structure of the obstacle-breaking reamer provided in the embodiment of the present invention when the cutting head is extended;

[0043] Figure 9 This is a structural schematic diagram of the multi-stage telescopic rod provided in an embodiment of the present invention;

[0044] Figure 10 This is a schematic diagram of the structure of the obstacle-breaking reamer provided in the embodiment of the present invention when the cutting head is retracted;

[0045] Figure 11 This is a schematic diagram of the structure of the lower limit of the first-stage rotating rod and the lower limit of the second-stage telescopic rod provided in an embodiment of the present invention.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1-Protective housing, 11-Sleeve housing, 111-Inlet hole, 12-Guide housing, 121-Guide hole, 13-Propeller shaft housing, 131-Drain hole, 2-Fully supported rudder, 21-Upper fin, 22-Rudder plate, 23-Lower fin, 24-Rudder stock, 25-Anti-jamming assembly, 251-First actuator, 252-Reciprocating rod, 253-Wear-resistant block, 26-Servo motor, 3-Retreating obstacle-breaking device, 31-Obstacle-breaking cutter, 311-Cutter head, 312-First-stage rotating rod, 3121-Lower limit of first-stage rotating rod, 313-Second-stage telescopic rod, 3131-Lower limit of second-stage telescopic rod, 3132-Upper limit of second-stage telescopic rod, 3133-Second-stage telescopic rod slider, 314-Third-stage telescopic rod, 3141-Third-stage telescopic rod slider, 315-Sealing sleeve, 31 6-Modible hydraulic pipe fitting, 317-Hydraulic hose, 318-Sealed pipe fitting, 319-Hydraulic pipe, 32-Second actuator, 321-Limit threaded sleeve, 322-Electromagnetic sleeve actuator, 33-Bearing seat, 331-Cut tool sleeve, 4-Blowout system, 41-Control cabinet, 42-Auxiliary air tank, 43-Vertical air pipe, 44-Longitudinal air pipe, 45-Front nozzle, 46-Rear nozzle, 5-Modible plate, 51-Top grid plate, 511-Upper grid hole, 52-Middle top grid plate, 521-Middle top grid hole, 53-Middle bottom grid plate, 531-Middle bottom grid hole, 54-Bottom grid plate, 55-Traction component, 56-Guide hole, 57-One-way hinge, 61-Propeller, 62-Propeller shaft, 7-Stern plate, 8-Bottom of hull lifting. Detailed Implementation

[0048] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 the technical solution of this invention 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 invention.

[0050] When amphibious landing craft conduct landing operations, they need to beach themselves and retreat. During this process, they are susceptible to damage to propellers and rudder jamming due to various obstacles in the mudflats and shallow waters. Since propeller and rudder malfunctions directly affect the mission performance of amphibious landing craft, it is necessary to protect the propellers and rudder equipment.

[0051] However, existing amphibious landing craft lack sufficient protection for propellers and rudder equipment, relying mainly on manual emergency handling, which affects the efficiency of amphibious landing craft in round-trip transportation.

[0052] To address the aforementioned technical problems, embodiments of the present invention provide a propeller protection device that can physically protect the propeller, propeller shaft, and all-support rudder while minimizing the impact on water flow. The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Figure 1 This is a three-dimensional structural schematic diagram of a propeller protection device provided in an embodiment of the present invention. Figure 2 This is a side view of a propeller protection device provided in an embodiment of the present invention. Figure 3 This is a bottom view of a propeller protection device provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the movable plate provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of the fully supported rudder provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the anti-jamming and anti-pulling component provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of the structure of the retreat obstacle-breaking device provided in an embodiment of the present invention. Figure 8 This is a schematic diagram of the structure of the obstacle-breaking reamer provided in the embodiment of the present invention when the cutter head is extended. Figure 9 This is a structural schematic diagram of the multi-stage telescopic rod provided in an embodiment of the present invention. Figure 10 This is a schematic diagram of the structure of the obstacle-breaking reamer provided in the embodiment of the present invention in the retracted state. Figure 11 This is a schematic diagram of the structure of the lower limit of the first-stage rotating rod and the lower limit of the second-stage telescopic rod provided in an embodiment of the present invention.

[0053] like Figure 1-3 As shown in the figure, an embodiment of the present invention provides a propeller protection device, comprising: a protective outer shell 1 that surrounds the propeller 61, the propeller shaft 62, and the full-support rudder 2. The protective outer shell 1 includes: a bushing outer shell 11, a flow guide outer shell 12, and a propeller circumferential outer shell 13. The bushing outer shell 11 surrounds the outer periphery of the propeller shaft 62 and has symmetrically opened inlet holes 111 about the propeller shaft 62. The flow guide outer shell 12 surrounds the outer periphery of the junction between the propeller shaft 62 and the propeller 61 and has symmetrically opened flow guide holes at the center height of the propeller shaft 62. 121. The guide shell 12 is connected between the bushing shell 11 and the propeller circumferential shell 13 in a straight transition diameter form. The propeller circumferential shell 13 wraps around the outer periphery of the propeller 61. The propeller circumferential shell 13 has vent holes 131 symmetrically opened about the propeller 61. The bushing shell 11, the guide shell 12 and the propeller circumferential shell 13 are connected as a whole along the extension direction of the propeller shaft 62. The bushing shell 11, the guide shell 12 and the propeller circumferential shell 13 are open to the side facing the bottom of the hull. In this embodiment, the propeller circumferential shell 13 has three vent holes 131 symmetrically opened on the left and right sides.

[0054] This invention provides a propeller protection device that protects the propeller shaft through a bushing shell, the propeller itself through a blade circumferential shell, and the connection between the propeller shaft and the propeller through a flow guide shell, thus providing all-around protection for the propeller. It also protects the full-support rudder within the protective shell. The bushing shell, flow guide shell, and blade circumferential shell are sequentially provided with inlet holes, flow guide holes, and outlet holes, allowing water to enter the propeller through these holes, ensuring propeller flow and balancing physical protection with smooth water flow. This ensures that the propeller's normal propulsion is not affected by the flow. Since the flow guide holes in the bushing shell are along the water flow direction, the flow rate is limited. By designing the flow guide shell as a straight transition diameter type, i.e., a trumpet-shaped transition, the opening faces the water flow direction, allowing for a larger flow rate. This reduces the impact of the protective shell and provides all-around protection for the propeller, propeller shaft, and full-support rudder.

[0055] refer to Figure 4The propeller protection device provided in this embodiment of the invention also includes a movable plate 5 that can be closed on the side of the protective shell 1 near the stern plate 7. The movable plate 5 includes: a top grid plate 51, a plurality of middle grid plates, a bottom grid plate 54, and a traction member 55. The first end of the top grid plate 51 is connected to the stern plate 7. The plurality of middle grid plates are sequentially hinged to a single unit. The first end of the topmost middle grid plate is hinged to the second end of the top grid plate 51. The first end of the bottom grid plate 54 is hinged to the second end of the bottommost middle grid plate. The traction member 55 is sequentially connected to the top grid plate 51, the middle grid plates, and the bottom grid plate 54. One end of the traction member 55 extends out of the top grid plate 51. By pulling the traction member 55 toward the stern plate 7, the bottom grid plate 54 and the middle grid plates are folded toward the stern plate 7. The top grid plate 51, the middle grid plate, and the bottom grid plate 54 are all provided with flow holes.

[0056] In this embodiment, the movable plate 5 is a curtain-type movable plate, and the multiple middle grid plates include a middle top grid plate 52, a middle bottom grid plate 53, and a bottom grid plate 54. The traction member 55 is a traction rope. Guide holes 56 are provided on the stern plate 7 and each grid plate. The raising and lowering of the movable plate 5 is controlled by the traction rope. The top grid plate 51 has three parallel upper grid holes 511, the middle top grid plate 52 has two parallel middle top grid holes 521, and the middle bottom grid plate 53 has one middle bottom grid hole 531, so that the upper grid holes 511, the middle top grid holes 521, and the middle bottom grid holes 531 can serve as flow holes.

[0057] Optionally, one-way hinges 57 are installed between the top grid plate 51 and the middle grid plate, between multiple middle grid plates, and between the middle grid plate and the bottom grid plate 54. The one-way hinges 57 are used to control the folding direction. One-way hinges 57 are also installed between the top grid plate 51 and the middle top grid plate 52, between the middle top grid plate 52 and the middle bottom grid plate 53, and between the middle bottom grid plate 53 and the bottom grid plate 54 to control the folding direction.

[0058] This invention employs retractable curtain-type movable panels, controlled by traction ropes for downward and upward movement, with one-way hinges controlling the folding direction between the panels. When the amphibious landing craft is moving forward, the movable panels are retracted to ensure normal propulsion efficiency; when retreating on the mudflats, the panels are lowered to protect the propulsion system's safety.

[0059] refer to Figure 5The fully supported rudder 2 includes an upper fin 21, a rudder plate 22, a lower fin 23, and a rudder stock 24. The upper fin 21 is connected to the bottom lifting 8 of the hull, and the lower fin 23 is connected to the propeller circumferential shell 13. The rudder plate 22 is installed between the upper fin 21 and the lower fin 23, connected in series via the rudder stock 24. An anti-jamming assembly 25 is connected to the rudder stock 24. When an object in the water becomes entangled in the rudder stock 22, the anti-jamming assembly 25 can cut the object. This invention uses a rod-type anti-jamming device on the fully supported rudder to assist in clearing the rudder from twisting difficulties in a sludge environment, without affecting the normal rotation of the rudder plate, ensuring that the amphibious landing craft remains directionally controllable at all times.

[0060] For details, please refer to the following: Figure 6 The anti-jamming assembly 25 includes a first actuator 251 and a reciprocating rod 252. The first actuator 251 is fixed to the upper fin 21, and the reciprocating rod 252 is connected to the first actuator 251. A wear-resistant block 253 is connected to the reciprocating rod 252, and the wear-resistant block 253 is located between the upper fin 21 and the rudder plate 22. The first actuator 251 drives the reciprocating rod 252 to move back and forth so that the wear-resistant block 253 moves back and forth along the gap between the upper fin 21 and the rudder plate 22. The reciprocating rod 252 is connected to the wear-resistant block 253, which is U-shaped. The wear-resistant block 253 rubs back and forth between the upper fin 21 and the rudder, pushing away any debris stuck in the gap, thereby allowing the rudder plate to rotate smoothly under the drive of the rudder stick without jamming.

[0061] Since propeller and rudder malfunctions directly affect the mission execution capability of amphibious landing craft, it is necessary to protect the propeller and rudder equipment and enable them to actively overcome obstacles in a variable and complex environment. Therefore, the propeller protection device provided in this embodiment of the invention also includes a retreat obstacle-breaking device 3. The retreat obstacle-breaking device 3 includes a spiral drill bit. By symmetrically arranging the spiral drill bit at the stern, if an obstacle blocks the stern during the hull's retreat, the spiral drill bit can break through the obstacle or push it into the mud, allowing the hull to pass over the obstacle.

[0062] refer to Figure 7 The retreat obstacle-breaking device 3 includes a support base 33 and an obstacle-breaking scissor 31. The support base 33 is fixedly connected to the stern plate 7. A second actuator 32 is connected to the support base 33, providing power and control signals to the second actuator 32. The obstacle-breaking scissor 31 is connected to the second actuator 32, and the second actuator 32 can drive the obstacle-breaking scissor 31 to retract into the support base 33 for protection. This invention uses a scissor-type retreat obstacle-breaking device to improve the retreat capability on tidal flats with many rocks and fixed obstacles, breaking up large, hard objects that hinder propulsion, and improving the retreat passability of the landing craft.

[0063] refer to Figures 8 to 11The obstacle-breaking reamer 31 includes a cutter head 311 and a multi-stage telescopic rod connected to the cutter head 311. The multi-stage telescopic rod is connected to the second driver 32 so that the multi-stage telescopic rod extends and retracts step by step, thereby causing the cutter head 311 to extend or retract into the support seat 33.

[0064] The second actuator 32 engages with the first-stage rotating rod 312 via threaded rotation. The cutter head 311 is protected by retracting into the integrated bearing 33. The hydraulic station regulates the pressure within the sealing sleeve 315 via hydraulic pipe 319, sealing pipe joint 318, hydraulic hose 317, and movable hydraulic pipe joint 316. When the pressure increases, the third-stage telescopic rod 314 and the second-stage telescopic rod 313 extend outward; when the pressure decreases, they shorten. During pressurization, the lower limit 3121 of the first-stage rotating rod limits the stroke of the second-stage telescopic rod slider 3133, and the lower limit 3131 of the second-stage telescopic rod limits the stroke of the third-stage telescopic rod slider 3141. During pressurization, the upper limit 3132 of the second-stage telescopic rod limits the stroke of the third-stage telescopic rod slider 3141.

[0065] This invention employs a reamer-type retreat obstacle-breaking device to improve the retreat capability on tidal flats with many rocks and fixed obstacles, breaking up large, hard objects that hinder propulsion and improving the landing craft's retreat passability.

[0066] Optionally, a blow-off system 4 is also included, which uses high-pressure air to blow away obstacles entangled inside the protective housing 1.

[0067] Optionally, the purging system 4 includes: a control cabinet 41, an auxiliary air tank 42, a vertical air pipe 43, a longitudinal air pipe 44, a front nozzle 45, and a rear nozzle 46. The control cabinet 41 is installed in the stern compartment, the auxiliary air tank 42 is installed in the stern compartment, the upper end of the vertical air pipe 43 is connected to the auxiliary air tank 42, the longitudinal air pipe 44 extends along the bottom plate of the ship and one end is connected to the lower end of the vertical air pipe 43, the front nozzle 45 is installed in the bottom lifting 8 of the ship and is adjacent to the bushing housing 11. The nozzle of the front nozzle 45 faces downward. The rear nozzle 46 is installed in the bottom lifting 8 of the ship and is adjacent to the propeller housing 13. The nozzle of the rear nozzle 46 is horizontal. The front nozzle 45 and the rear nozzle 46 are connected to the longitudinal air pipe 44.

[0068] The purging control cabinet 41 and auxiliary air tank 42 are installed in the stern compartment for easy operation. Air is supplied downwards through a vertical air pipe 43 and then transferred to the front nozzle 45 and rear nozzle 46 through a longitudinal air pipe 44. The front nozzle 45 and rear nozzle 46 are installed on the bottom lifting 8 of the ship. The front nozzle 45 is adjacent to the bushing housing 11 and is arranged longitudinally to improve longitudinal purging capacity. The rear nozzle 46 is adjacent to the propeller circumferential housing 13 and is arranged laterally to improve lateral purging capacity. This invention uses a forward and backward counter-directional purging system, using high-pressure air. The front longitudinal nozzle purifies the naturally accumulated sediment in front of the propeller, while the rear transverse nozzle purifies the sediment accumulated behind the propeller, preventing the propulsion system from getting stuck in the sediment.

[0069] Because the hull is made of steel, the ship needs a rudder for navigation. The rudder is also protected within the protective hull. The lower fin is welded to the hull and is used to clear mud and debris from the rudder gaps. The obstacle-breaking device consists of symmetrically arranged auger drills. If obstacles such as shell fragments or cement blocks block the landing craft's retreat, the drills can break through or push them into the mud, allowing the ship to pass. Seaweed and kelp entangled within the protective hull will become trapped inside the protective cage. High-pressure air can blow away the entanglement. The longitudinal direction refers to the "bow-stern" direction. It runs diagonally along the hull.

[0070] This invention proposes a protective device for the propeller of an amphibious landing craft, combining physical protection with obstacle-clearing methods to ensure the amphibious landing craft maintains its operational capability in complex and ever-changing battlefield environments. The steel perforated protective cage, with its stepped diameter variation, minimizes its impact on water flow. A curtain-like movable panel is installed at the stern of the protective cage, which retracts during forward movement and lowers during reverse movement to prevent fishing nets, wire mesh, metal debris, etc., from getting caught in the propeller and rudder in mudflats. Two reverse obstacle-clearing devices are installed on the stern bottom plate, using a reamer to clear obstacles such as rocks or concrete blocks, thus clearing the path. Inside the protective cage, two sets of blowing devices are installed at the raised section of the hull bottom for clearing deep mud, preventing the craft from getting stuck.

[0071] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A propeller protection device, characterized in that, include: A protective outer shell (1) enclosing the propeller (61), propeller shaft (62), and fully supported rudder (2), wherein the protective outer shell (1) comprises: The bushing housing (11) is wrapped around the outer periphery of the spiral shaft (62), and the bushing housing (11) has an inlet hole (111) symmetrical about the spiral shaft (62); The flow guide shell (12) is wrapped around the outer periphery of the junction between the spiral shaft (62) and the propeller (61). The flow guide shell (12) has symmetrical flow guide holes (121) at the center height of the spiral shaft (62). The flow guide shell (12) is connected between the shaft sleeve shell (11) and the propeller circumference shell (13) in a straight transition diameter form. The propeller periphery shell (13) is wrapped around the outer periphery of the propeller (61) and the full support rudder (2). The propeller periphery shell (13) has a vent hole (131) symmetrical about the propeller (61). The bushing shell (11), the flow guide shell (12) and the propeller periphery shell (13) are connected as one unit along the extension direction of the propeller shaft (62). The bushing shell (11), the flow guide shell (12) and the propeller periphery shell (13) are open to the side facing the bottom of the hull.

2. The propeller protection device as described in claim 1, characterized in that, It also includes a movable plate (5) capable of being closed on the side of the protective shell (1) near the stern plate (7), the movable plate (5) comprising: The top grid plate (51) is connected at its first end to the stern plate (7); Multiple middle grid plates are hinged together in sequence, with the first end of the top middle grid plate hinged to the second end of the top grid plate (51). The bottom grid plate (54) has its first end hinged to the second end of the middle grid plate located at the bottom. A traction member (55) is connected in sequence to the top grid plate (51), the middle grid plate and the bottom grid plate (54). One end of the traction member (55) extends out of the top grid plate (51). By pulling the traction member (55) toward the stern plate (7), the bottom grid plate (54) and the middle grid plate are folded toward the stern plate (7). The top grid plate (51), the middle grid plate and the bottom grid plate (54) are all provided with flow holes.

3. The propeller protection device as described in claim 2, characterized in that, One-way hinges (57) are installed between the top grid plate (51) and the middle grid plate, between multiple middle grid plates, and between the middle grid plate and the bottom grid plate (54). The one-way hinges (57) are used to control the folding direction.

4. The propeller protection device as described in claim 1 or 3, characterized in that, The fully supported rudder (2) includes a rudder stock (24) extending out of the hull, and an anti-jamming assembly (25) is connected to the rudder stock (24). The anti-jamming assembly (25) is capable of cutting the object when it gets entangled in the rudder stock (22) in the water.

5. The propeller protection device as described in claim 4, characterized in that, The anti-jamming component (25) includes: The first actuator (251) is fixed to the upper fin (21); A reciprocating rod (252) is connected to the first driver (251). A wear-resistant block (253) is connected to the reciprocating rod (252). The wear-resistant block (253) is located between the upper fin (21) and the rudder plate (22). The first driver (251) drives the reciprocating rod (252) to move back and forth so that the wear-resistant block (253) moves back and forth along the gap between the upper fin (21) and the rudder plate (22).

6. The propeller protection device as described in claim 1 or 3, characterized in that, It also includes a retreat obstacle-breaking device (3), which includes a spiral drill bit. By symmetrically arranging the spiral drill bit at the stern, if an obstacle blocks the stern during the ship's retreat, the spiral drill bit can break the obstacle or push it into the mud, allowing the ship to pass over the obstacle.

7. The propeller protection device as described in claim 6, characterized in that, The regressive obstacle-breaking device (3) includes: The support base (33) is fixedly connected to the stern plate (7), and a second driver (32) is connected to the support base (33). The support base (33) provides power and control signals to the second driver (32). The obstacle-breaking reamer (31) is connected to the second driver (32), which is capable of driving the obstacle-breaking reamer (31) to retract into the support (33) for protection.

8. The propeller protection device as described in claim 7, characterized in that, The obstacle-breaking reamer (31) includes a cutter head (311) and a multi-stage telescopic rod connected to the cutter head (311). The multi-stage telescopic rod is connected to a second driver (32) so that the multi-stage telescopic rod extends and retracts step by step, thereby causing the cutter head (311) to extend or retract into the support seat (33).

9. The propeller protection device as described in claim 1 or 3, characterized in that, It also includes a blow-out system (4) that blows out obstacles entangled in the protective housing (1) using high-pressure air.

10. The propeller protection device as described in claim 9, characterized in that, The blowing system (4) includes: Control cabinet (41), installed in the stern compartment; Auxiliary gas cylinder (42) is installed in the stern compartment; A vertical air pipe (43) is connected at its upper end to the auxiliary air tank (42); A longitudinal air pipe (44) extends along the bottom plate of the ship and is connected at one end to the lower end of the vertical air pipe (43); A front nozzle (45) is installed on the bottom of the ship and raised (8). The front nozzle (45) is adjacent to the bushing housing (11) and the nozzle of the front nozzle (45) faces downward. A rear nozzle (46) is installed at the bottom of the ship and raised (8). The rear nozzle (46) is adjacent to the paddle circumferential shell (13). The nozzle of the rear nozzle (46) is horizontal. The front nozzle (45) and the rear nozzle (46) are connected to the longitudinal air pipe (44).

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