A polar transport landing craft

Abstract

The present invention provides a polar transport landing craft, which relates to the technical field of ships, and includes a hull, a bracket, a first rudder blade, a second rudder blade, a connecting rod, a first rotating shaft, a second rotating shaft and a transmission mechanism; the bracket is installed at the tail of the hull, the first rudder blade is rotatably installed on the bracket through the first rotating shaft, and the second rudder blade is rotatably installed on the bracket through the second rotating shaft; the first rudder blade includes a first expansion piece and a second expansion piece, and the two expansion pieces are alternately installed on the first rotating shaft; the connecting rod is rotatably connected with the first expansion piece and the second rudder blade respectively; a transmission mechanism is provided between the first rotating shaft, the first expansion piece and the second expansion piece, and the transmission mechanism has a switchable first transmission state and a second transmission state; the first expansion piece and the second expansion piece rotate in the same direction in the first transmission state, and rotate in the opposite direction in the second transmission state. The second expansion piece rotates to the wind duct between the first rudder blade and the second rudder blade, reducing the sliding distance and improving the performance of effective risk avoidance.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a polar transport landing craft. Background Art

[0002] Polar transport landing craft is an amphibious vessel specially designed for low-temperature and polar environments, mainly used for the transportation of personnel and materials and landing operations. This type of boat is usually able to navigate on icy sea water, snow and ice.

[0003] Polar transport landing craft travel on ice, land or sea. When encountering danger or needing to stop suddenly, they use brake devices to brake. However, the friction on the ice is too small and the braking effect is limited. The gliding distance of polar transport landing craft is still relatively long and cannot effectively avoid danger. Summary of the invention

[0004] The problem to be solved by the present invention is that the friction force on the ice surface is small, the braking effect is limited, and the polar transport landing craft cannot effectively avoid danger.

[0005] In order to solve the above problems, the present invention provides a polar transport landing craft, characterized in that it includes a hull, a bracket, a first rudder blade, a second rudder blade, a connecting rod, a first rotating shaft, a second rotating shaft and a transmission mechanism;

[0006] The bracket is installed at the tail of the hull, the first rudder blade is rotatably installed on the bracket via the first rotating shaft, the second rudder blade is rotatably installed on the bracket via the second rotating shaft, the second rotating shaft is parallel to the first rotating shaft and spaced apart, and the second rudder blade is parallel to the second rotating shaft;

[0007] The first rudder blade includes a first expansion piece and a second expansion piece, the first expansion piece and the second expansion piece are both parallel to the first rotating shaft and are alternately installed on the first rotating shaft along the axial direction of the first rotating shaft; the connecting rod is rotatably connected to the first expansion piece and the second rudder blade respectively, and the connecting rod is used to drive the first expansion piece and the second rudder blade to rotate; the transmission mechanism is provided between the first rotating shaft, the first expansion piece and the second expansion piece, and the transmission mechanism has a switchable first transmission state and a second transmission state, in the first transmission state the first expansion piece and the second expansion piece are used to rotate in the same direction, and in the second transmission state the first expansion piece and the second expansion piece are used to rotate in the opposite direction.

[0008] Optionally, the polar transport landing craft further includes a support member, wherein the support member is sleeved on the first rotating shaft, and the support member is arranged between the first expansion piece and the second expansion piece.

[0009] Optionally, the first expansion piece is provided with a first axial hole for the first rotating shaft to pass through; the transmission mechanism includes a first keyway arranged on the inner wall of the first axial hole and extending along the axial direction of the first rotating shaft, and a first transmission member installed on the first rotating shaft, and the first transmission member is slidably installed in the first keyway along the axial direction of the first rotating shaft.

[0010] Optionally, the second expansion piece is provided with a second axial hole for the first rotating shaft to pass through; the transmission mechanism also includes an annular groove and a second key groove arranged on the inner wall of the second axial hole, and a second transmission member installed on the first rotating shaft; the annular groove and the second key groove are arranged in sequence along the axial direction of the first rotating shaft, and the annular groove is connected to the second key groove; the second transmission member slides in the second key groove or the annular groove.

[0011] Optionally, the transmission mechanism also includes a transmission gear set located between the adjacent first expansion piece and the second expansion piece, the transmission gear set includes a first gear, a second gear and a third gear, the first gear and the third gear are mounted on the first rotating shaft, the first gear is mounted on the first rotating shaft and is close to the first expansion piece, the second gear is rotatably mounted on an end of the second expansion piece close to the first expansion piece, the third gear is mounted on an end of the second expansion piece close to the first expansion piece, the first gear and the second gear are external gears, the third gear is an internal gear, the second gear is meshed with the third gear, and when the second transmission member is in the annular groove, the first gear is meshed with the second gear.

[0012] Optionally, the support member is a hollow cylindrical structure, the support member is sleeved on the first rotating shaft, and the first gear, the second gear and the third gear are arranged in the support member.

[0013] Optionally, the polar transport landing craft further includes a first steering gear, which is mounted on the bracket, and a driving end of the first steering gear is connected to the first rotating shaft for driving the first rotating shaft to move axially along the first rotating shaft.

[0014] Optionally, the length of the annular groove is greater than the length of the second transmission member, and the sum of the lengths of the second keyway and the annular groove is less than or equal to the length of the first keyway.

[0015] Optionally, the polar transport landing craft further includes a second steering gear, which is mounted on the bracket, and a driving end of the second steering gear is connected to the connecting rod.

[0016] Optionally, the first rudder blade is arranged on both sides of the second rudder blade.

[0017] The beneficial effects of a polar transport landing craft of the present invention are:

[0018] The bracket is installed at the stern of the hull, and a propeller is installed in the bracket. When the propeller rotates, it pushes the polar transport landing craft forward; the connecting rod is rotatably connected with the first expansion piece and the second rudder blade respectively, and a transmission mechanism is provided between the first rotating shaft, the first expansion piece and the second expansion piece, and the transmission mechanism has a switchable first transmission state and a second transmission state; in the first transmission state, the first expansion piece and the second expansion piece can rotate in the same direction; in the second transmission state, the first expansion piece and the second expansion piece can rotate in opposite directions; when the transmission mechanism is in the first transmission state, the driving force of the connecting rod is transmitted from the first expansion piece to the second expansion piece, and the first expansion piece and the second expansion piece rotate in the same direction. At this time, the first expansion piece and the second expansion piece are coplanar, and at this time, the first rudder blade and the second rudder blade move in the same direction at the same time. Since the first rotating shaft and the second rotating shaft are parallel, the first rudder blade and the second rudder blade The blades remain parallel to form an air duct, which guides the wind direction of the propeller, making it easier to push the landing craft forward and control the steering of the landing craft; when emergency braking is required, the propeller 3 can be controlled to stop and the brake can be controlled to brake, and the transmission mechanism can be adjusted to the second transmission state, and the driving force of the connecting rod is transmitted from the first expansion piece to the second expansion piece, and the first expansion piece and the second expansion piece rotate in opposite directions. At this time, the second expansion piece rotates to the air duct between the first rudder blade and the second rudder blade, disrupting the air flow direction at the rudder blade of the landing craft, reducing the driving force on the landing craft, and increasing the wind resistance of the landing craft, further reducing the forward ability of the landing craft, and this method is not affected by the ground conditions. Even if the landing craft is on the ice, it can still further reduce the forward power of the landing craft, reduce the sliding distance of the polar transport landing craft when braking, and improve the performance of effective risk avoidance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A front view of a polar transport landing craft provided by an embodiment of the present invention;

[0020] Figure 2 A top view of a polar transport landing craft provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the installation of a rudder blade for a polar transport landing craft provided by an embodiment of the present invention;

[0022] Figure 4 A schematic structural diagram of a second rudder blade provided in an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a first rudder blade provided in an embodiment of the present invention;

[0024] Figure 6 for Figure 5 A local enlarged schematic diagram of the middle A;

[0025] Figure 7 for Figure 6 Cross-sectional view at FF;

[0026] Figure 8 is a schematic diagram of the internal structure of the first axial hole;

[0027] Fig. 9 Schematic diagram of the internal structure of the second axial hole.

[0028] Description of reference numerals:

[0029] 1. Hull; 2. Bracket; 3. Propeller; 4. First rudder blade; 41. First extension piece; 42. Second extension piece; 43. First shaft hole; 44. Second shaft hole; 5. Second rudder blade; 6. Connecting rod; 7. Second steering gear; 8. Second rotating shaft; 9. First rotating shaft; 10. Support member; 11. First steering gear; 12. Sleeve; 13. First keyway; 14. First transmission member; 15. First gear; 16. Second gear; 17. Third gear; 18. Second transmission member; 19. Ring groove; 20. Second keyway. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0031] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0032] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0033] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a polar transport landing craft.

[0034] like Figure 1-Figure 3 As shown, a polar transport landing craft provided by an embodiment of the present invention includes a hull 1, a bracket 2, a first rudder blade 4, a second rudder blade 5, a connecting rod 6, a first rotating shaft 9, a second rotating shaft 8 and a transmission mechanism;

[0035] The bracket 2 is installed at the tail of the hull 1, the first rudder blade 4 is rotatably installed on the bracket 2 through the first rotating shaft 9, the second rudder blade 5 is rotatably installed on the bracket 2 through the second rotating shaft 8, the second rotating shaft 8 is parallel to the first rotating shaft 9 and is arranged at an interval, and the second rudder blade 5 is arranged parallel to the second rotating shaft 8;

[0036] The first rudder blade 4 includes a first expansion piece 41 and a second expansion piece 42, the first expansion piece 41 and the second expansion piece 42 are both parallel to the first rotating shaft 9, and are alternately installed on the first rotating shaft 9 along the axial direction of the first rotating shaft 9; the connecting rod 6 is rotatably connected with the first expansion piece 41 and the second rudder blade 5 respectively, and the connecting rod 6 is used to drive the first expansion piece 41 and the second rudder blade 5 to rotate; the transmission mechanism is provided between the first rotating shaft 9, the first expansion piece 41 and the second expansion piece 42, and the transmission mechanism has a switchable first transmission state and a second transmission state. In the first transmission state, the first expansion piece 41 and the second expansion piece 42 are used to rotate in the same direction, and in the second transmission state, the first expansion piece 41 and the second expansion piece 42 are used to rotate in the opposite direction.

[0037] Specifically, Figure 1 As shown, the bracket 2 is installed at the tail of the hull 1, and a propeller 3 is installed in the bracket 2. When the propeller 3 rotates, it pushes the polar transport landing craft forward. Figure 2 As shown, the first rudder blade 4 and the second rudder blade 5 are installed on the bracket 2. Figure 3 As shown, the first rudder blade 4 may be provided on both sides of the second rudder blade 5. Figure 3 As shown, since the first rotating shaft 9 and the second rotating shaft 8 are parallel, the first rudder blade 4 is installed in parallel on the first rotating shaft 9, and the second rudder blade 5 is installed in parallel on the second rotating shaft 8, the first rudder blade 4 and the second rudder blade 5 are arranged in parallel, and a wind channel is formed between the two rudder blades. When the landing craft wants to move forward in a straight line, the first rudder blade 4 and the second rudder blade 5 are maintained as Figure 3The position shown in the figure makes the air duct parallel to the straight forward direction of the landing craft, so that the air discharged backward through the air duct pushes the landing craft forward; if you want to make the landing craft turn, you need to change the angle of the first rudder blade 4 and the second rudder blade 5, so that the air duct is tilted, and the air passing through the air duct is discharged to one side of the landing craft along the tilted air duct, thereby pushing the tail of the landing craft to move sideways, so that the landing craft turns and completes the purpose of turning. In order to facilitate the turning operation of the air duct and maintain the air duct with good ventilation, it is necessary to keep the first rudder blade 4 and the second rudder blade 5 in a parallel state at all times, which requires the first rudder blade 4 and the second rudder blade 5 to move synchronously, such as Figure 3 As shown, a connecting rod 6 is arranged between the first rudder blade 4 and the second rudder blade 5. Both ends of the connecting rod 6 are rotatably mounted on the first rudder blade 4 and the second rudder blade 5. When the connecting rod 6 is driven, for example, Figure 3 In the embodiment, the connecting rod 6 is driven upward, which can simultaneously drive the first rudder blade 4 and the second rudder blade 5 to move synchronously. If the first rudder blade 4 is a complete rudder blade, similar to the second rudder blade 5, when the connecting rod 6 moves, the first rudder blade 4 and the second rudder blade 5 rotate synchronously in the same direction, which can ensure that the first rudder blade 4 and the second rudder blade 5 are always parallel, and only the inclination angle of the air duct is changed, so that the landing craft can still maintain a high propulsion force during the turning process. The air duct formed by the first rudder blade 4 and the second rudder blade 5 can produce a strong propulsion performance, but it becomes a disadvantage when the landing craft wants to brake and reduce the propulsion force. In order to solve this disadvantage while taking into account the advantages of the synchronous movement of multiple rudder blades, the present invention designs the first rudder blade 4 into a split type, splits the first rudder blade 4 into multiple first expansion pieces 41 and multiple second expansion pieces 42, and adds a transmission mechanism for the synchronous transmission between the multiple first expansion pieces 41 and the multiple second expansion pieces 42.

[0038] In this optional embodiment, if Figure 4 As shown, the second rotating shaft 8 is mounted on the bracket 2, and the second rudder blade 5 is rotatably mounted on the second rotating shaft 8. When the connecting rod 6 transmits power to the second rudder blade 5, the second rudder blade 5 rotates on the second rotating shaft 8. In addition, the second rudder blade 5 can also be fixed on the second rotating shaft 8, and the second rotating shaft 8 is rotatably mounted on the bracket 2. In this case, the second rudder blade 5 can also rotate under the drive of the connecting rod 6. Figure 5As shown, the first rudder blade 4 includes a first expansion piece 41 and a second expansion piece 42, and the first expansion piece 41 and the second expansion piece 42 are alternately installed on the first rotating shaft 9, and the connecting rod 6 drives the first expansion piece 41 to rotate, and the connecting rod 6 is respectively rotatably connected with the first expansion piece 41 and the second rudder blade 5, and a transmission mechanism is provided between the first rotating shaft 9, the first expansion piece 41 and the second expansion piece 42, and the transmission mechanism has a switchable first transmission state and a second transmission state; in the first transmission state, the first expansion piece 41 and the second expansion piece 42 can rotate in the same direction; in the second transmission state, the first expansion piece 41 and the second expansion piece 42 can rotate in opposite directions; in the first transmission state, the driving force of the connecting rod 6 is transmitted from the first expansion piece 41 to the second expansion piece 42 through the transmission mechanism, and the first expansion piece 41 and the second expansion piece 42 rotate in the same direction, and the first expansion piece 41 and the second expansion piece 42 remain coplanar. At this time, the first rudder blade 4 and the second rudder blade 5 can move in the same direction at the same time, and the first rudder blade 4 and the first rudder blade 4 and the second expansion piece 42 can move in the same direction at the same time. The two rudder blades 5 remain parallel to form an air duct, which guides the wind direction of the propeller 3, making it easier to push the landing craft forward and control the steering of the landing craft; when emergency braking is required, the propeller 3 can be controlled to stop and the brake can be controlled to brake, and the transmission mechanism is adjusted to the second transmission state, and the driving force of the connecting rod 6 is transmitted from the first expansion piece 41 to the second expansion piece 42, and the first expansion piece 41 and the second expansion piece 42 rotate in opposite directions. At this time, the first expansion piece 41 and the second rudder blade 5 rotate in the same direction, and the second expansion piece 42 rotates in the opposite direction to the air duct between the first rudder blade 4 and the second rudder blade 5, disrupting the air flow direction at the rudder blades of the landing craft, reducing the driving force on the landing craft, and increasing the wind resistance of the landing craft, further reducing the forward ability of the landing craft, and this method is not affected by the ground conditions. Even if the landing craft is on the ice, it can still further reduce the forward power of the landing craft, reduce the sliding distance of the polar transport landing craft when braking, and improve the performance of effective risk avoidance.

[0039] Alternatively, if Figure 5 As shown, the polar transport landing craft further includes a support member 10 , which is sleeved on the first rotating shaft 9 , and the support member 10 is disposed between the first extension piece 41 and the second extension piece 42 .

[0040] In this optional embodiment, if Figure 5 As shown, a support member 10 is provided between the first expansion piece 41 and the second expansion piece 42. By installing the support member 10, an installation space is left between the first expansion piece 41 and the second expansion piece 42, which is convenient for installing the transmission mechanism. The support member 10 can be designed as a separate part and installed between the first expansion piece 41 and the second expansion piece 42; or the support member 10 can be fixedly installed on the top of each first expansion piece 41 and the second expansion piece 42, and the support member 10 and the first expansion piece 41 and the second expansion piece 42 are designed as a whole, which reduces the steps of installation and taking.

[0041] Alternatively, if Figure 6 and Figure 8 As shown, the first expansion piece 41 is provided with a first axial hole 43 for the first rotating shaft 9 to pass through; the transmission mechanism includes a first keyway 13 arranged on the inner wall of the first axial hole 43 and extending along the axial direction of the first rotating shaft 9, and a first transmission member 14 installed on the first rotating shaft 9, and the first transmission member 14 is slidably installed in the first keyway 13 along the axial direction of the first rotating shaft 9.

[0042] In this optional embodiment, the first transmission member 14 may be a non-standard rectangular parallelepiped part or a standard long key, such as Figure 5 and Figure 6 As shown, since the first transmission member 14 is installed in the first key groove 13, the first transmission member 14 can slide in the first key groove 13 along the axial direction of the first rotating shaft 9, but cannot rotate in the first key groove 13 along the circumferential direction of the first rotating shaft 9, so that the first rotating shaft 9 and the first expansion piece 41 can only slide relative to each other along the axial direction of the first rotating shaft 9, and maintain synchronous movement in the circumferential direction of the first rotating shaft 9. Therefore, when the first expansion piece 41 is pushed and rotated by the connecting rod 6, it will drive the first rotating shaft 9 to rotate, and when the first rotating shaft 9 rotates, it will drive other first expansion pieces 41 on the first rotating shaft 9 to rotate together, so that multiple first expansion pieces 41 rotate synchronously.

[0043] Alternatively, if Figure 6 and Fig. 9 As shown, the second expansion piece 42 is provided with a second shaft hole 44 for the first rotating shaft 9 to pass through; the transmission mechanism also includes an annular groove 19 and a second key groove 20 provided on the inner wall of the second shaft hole 44, and a second transmission member 18 installed on the first rotating shaft 9; the annular groove 19 and the second key groove 20 are sequentially arranged along the axial direction of the first rotating shaft 9, and the annular groove 19 is connected with the second key groove 20; the second transmission member 18 slides in the second key groove 20 or the annular groove 19. The dimension of the annular groove 19 in the axial direction of the first rotating shaft 9 is the length of the annular groove 19, and the dimensions of the first key groove 13, the first transmission member 14, the second transmission member 18 and the second key groove 20 in the axial direction of the first rotating shaft 9 are all defined as length dimensions, the length of the annular groove 19 is greater than the length of the second transmission member 18, and the sum of the length of the second key groove 20 and the length of the annular groove 19 is less than or equal to the length of the first key groove 13, so that the second transmission member 18 can completely enter the annular groove 19, and the moving distance of the first transmission member 14 will not limit the movement of the second transmission member 18.

[0044] In this optional embodiment, if Figure 5 and Figure 6As shown, the first rotating shaft 9 is rotatably mounted on the bracket 2, and the first rotating shaft 9 can also slide along the axial direction of the first rotating shaft 9 relative to the bracket 2, the first expansion piece 41 and the second expansion piece 42. When the second transmission member 18 on the first rotating shaft 9 is in the second key groove 20, the transmission mechanism is in the first transmission state, and the first rotating shaft 9 is mutually limited with the second expansion piece 42 along its circumferential direction. As the first rotating shaft 9 rotates, the second expansion piece 42 is rotated together with it; when the first rotating shaft 9 moves along its axial direction, so that the second transmission member 18 completely slides from the second key groove 20 to the annular groove 19, the transmission mechanism is in the first transmission state. The driving mechanism is in the second transmission state, and the circumferential limit of the first rotating shaft 9 and the second expansion piece 42 is released. When the first rotating shaft 9 rotates, the second transmission member 18 rotates in the annular groove 19, and cannot drive the second expansion piece 42 to rotate with the first rotating shaft 9. At this time, the rotation of the first expansion piece 41 can be transmitted to the second expansion piece 42 through other transmission components (such as the transmission gear set mentioned later), so that the rotation directions of the first expansion piece 41 and the second expansion piece 42 are opposite, so that the second expansion piece 42 rotates to the wind duct, disturbing the air, reducing the driving force of the air, increasing wind resistance, and reducing the forward ability of the landing craft.

[0045] Alternatively, if Figure 6 and Figure 7 As shown, the transmission mechanism also includes a transmission gear set located between adjacent first expansion pieces 41 and second expansion pieces 42. Starting from the end of the first rotating shaft 9 close to the bracket 2, one first expansion piece 41 and one second expansion piece 42 are divided into a expansion piece group in sequence. The transmission gear set is located between the first expansion piece 41 and the second expansion piece 42 in each expansion piece group. The transmission gear set includes a first gear 15, a second gear 16 and a third gear 17. The first gear 15 and the third gear 17 are sleeved on the first rotating shaft 9. The first gear 15 is fixedly mounted on the first rotating shaft 9 and close to the first expansion piece 41. The second gear 16 is rotatably mounted on one end of the second expansion piece 42 close to the first expansion piece 41. The third gear 17 is fixedly mounted on one end of the second expansion piece 42 close to the first expansion piece 41. The first gear 15 and the second gear 16 are external gears, the third gear 17 is an internal gear, the second gear 16 is meshed with the third gear 17, and when the second transmission member 18 is in the annular groove 19, the first gear 15 is meshed with the second gear 16.

[0046] In this optional embodiment, if Figure 5 As shown, starting from the bottom end of the first rotating shaft 9 in the figure, a first expansion sheet 41 and a second expansion sheet 42 are divided into an expansion sheet group, and the same first expansion sheet 41 or the same second expansion sheet 42 is not divided repeatedly, that is, the expansion sheets in the two expansion sheet groups are not repeated. Figure 6 and Figure 7 As shown, the first gear 15 is fixedly mounted on the first rotating shaft 9, the second gear 16 is rotatably mounted on the bottom of the second spreading piece 42, and the third gear 17 is mounted on the bottom of the second spreading piece 42, for example Figure 6 When the first rotating shaft 9 is pushed upward along its axial direction, the first transmission member 14 slides in the first key groove 13, and the second transmission member 18 slides from the second key groove 20 into the annular groove 19. At this time, the first gear 15 moves axially to mesh with the second gear 16. When the first expansion piece 41 rotates, it drives the first rotating shaft 9 to rotate, the first rotating shaft 9 drives the first gear 15 to rotate, and the first gear 15 drives the second gear 16 to rotate. The second gear 16 is equivalent to a planetary gear, which rotates while revolving around the first gear 15. The second gear 16 drives the third gear 17 to rotate. Since the third gear 17 is fixedly mounted on the second expansion piece 42, the second expansion piece 42 can rotate with the third gear 17. In addition, since the first gear 15 and the second gear 16 are It is a mutual meshing transmission between external gears, so the rotation directions of the first gear 15 and the second gear 16 are opposite. Since the second gear 16 and the third gear 17 are meshing transmission between external gears and internal gears, the rotation directions of the second gear 16 and the third gear 17 are the same, so the rotation directions of the first gear 15 and the third gear 17 are opposite. Since the rotation direction of the first gear 15 is the same as the rotation direction of the first expansion sheet 41, and the rotation direction of the second expansion sheet 42 is the same as the rotation direction of the third gear 17, the rotation directions of the first expansion sheet 41 and the second expansion sheet 42 can be opposite. When the first expansion sheet 41 and the second expansion sheet 42 rotate in opposite directions, the second expansion sheet 42 rotates into the air duct to increase wind resistance and reduce air driving force. In addition, if the air duct between the first rudder blade 4 and the second rudder blade 5 is completely blocked, the wind resistance is large, the pressure on the rudder blade or the expansion piece entering the air duct is large, and the rudder blade or the expansion piece is easy to break, so the first expansion piece 41 and the second expansion piece 42 are not allowed to enter the air duct, but the second expansion piece 42 arranged at intervals is entered into the air duct, and the first expansion piece 41 is still kept parallel to the second rudder blade 5, which can not only reduce the wind resistance, but also prevent the second expansion piece 42 from being subjected to large air pressure. In addition, when the first rudder blades 4 are arranged on both sides of the second rudder blade 5, the second expansion pieces 42 in the two first rudder blades 4 are all entered into the air duct, which can further reduce the wind resistance, and can maintain the force balance on both sides of the second rudder blade 5, thereby ensuring the balance of the polar transport landing craft.

[0047] Alternatively, if Figure 7 As shown, the support member 10 is a hollow cylindrical structure, the support member 10 is sleeved on the first rotating shaft 9, and the first gear 15, the second gear 16 and the third gear 17 are arranged in the support member 10. The cylindrical support member 10 protects the first gear 15, the second gear 16 and the third gear 17, thereby extending the service life.

[0048] Alternatively, if Figure 6 As shown, the polar transport landing craft further includes a first steering gear 11, which is mounted on the bracket 2, and a driving end of the first steering gear 11 is connected to the first rotating shaft 9, and is used to drive the first rotating shaft 9 to move along the axial direction of the first rotating shaft 9. Figure 6 As shown, a sleeve 12 can also be added at the bottom of the bracket 2 or inside the bracket 2, and the first rotating shaft 9 is installed in the sleeve 12. When the first rotating shaft 9 rotates, the sleeve 12 limits the end shaking of the first rotating shaft 9 to ensure that the end of the first rotating shaft 9 connected to the first servo 11 does not shake, thereby preventing the shaft end shaking caused by the rotation of the first rotating shaft 9 from being transmitted to the first servo 11.

[0049] In this optional embodiment, the first steering gear 11 may be a cylinder or an electric telescopic cylinder, etc. When the driving end of the first steering gear 11 is extended, the first rotating shaft 9 is pushed upward, thereby switching the rotation direction of the second expansion piece 42 .

[0050] Alternatively, if Figure 3 As shown, the polar transport landing craft further includes a second steering gear 7 , which is mounted on the bracket 2 , and a driving end of the second steering gear 7 is connected to the connecting rod 6 .

[0051] In this optional embodiment, the second steering gear 7 can be a cylinder or an electric telescopic cylinder. When the driving end of the second steering gear 7 telescopes, it drives the connecting rod 6 to move in a certain direction. Figure 3 The first rudder blade 4 and the second rudder blade 5 move up and down, thereby driving the first rudder blade 4 and the second rudder blade 5 to rotate.

[0052] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A polar transport landing craft, characterized in that: It comprises a hull (1), a bracket (2), a first rudder blade (4), a second rudder blade (5), a connecting rod (6), a first rotating shaft (9), a second rotating shaft (8) and a transmission mechanism; The bracket (2) is mounted on the stern of the hull (1); the first rudder blade (4) is rotatably mounted on the bracket (2) via the first rotating shaft (9); the second rudder blade (5) is rotatably mounted on the bracket (2) via the second rotating shaft (8); the second rotating shaft (8) is parallel to the first rotating shaft (9) and is arranged at an interval; and the second rudder blade (5) is arranged parallel to the second rotating shaft (8); The first rudder blade (4) comprises a first expansion piece (41) and a second expansion piece (42), the first expansion piece (41) and the second expansion piece (42) are parallel to the first rotating shaft (9), and are alternately mounted on the first rotating shaft (9) along the axial direction of the first rotating shaft (9); the connecting rod (6) is rotatably connected to the first expansion piece (41) and the second rudder blade (5) respectively, and the connecting rod (6) is used to drive the first expansion piece (41) and the second rudder blade (5) to rotate; the transmission mechanism is provided between the first rotating shaft (9), the first expansion piece (41) and the second expansion piece (42), and the transmission mechanism has a switchable first transmission state and a second transmission state, in the first transmission state the first expansion piece (41) and the second expansion piece (42) are used to rotate in the same direction, and in the second transmission state the first expansion piece (41) and the second expansion piece (42) are used to rotate in opposite directions; It also comprises a support member (10), wherein the support member (10) is sleeved on the first rotating shaft (9), and the support member (10) is arranged between the first expansion piece (41) and the second expansion piece (42); The first expansion piece (41) is provided with a first shaft hole (43) for the first rotating shaft (9) to pass through; the transmission mechanism comprises a first keyway (13) provided on the inner wall of the first shaft hole (43) and extending along the axial direction of the first rotating shaft (9), and a first transmission member (14) mounted on the first rotating shaft (9), the first transmission member (14) being slidably mounted in the first keyway (13) along the axial direction of the first rotating shaft (9); The second expansion piece (42) is provided with a second shaft hole (44) for the first rotating shaft (9) to pass through; the transmission mechanism further comprises an annular groove (19) and a second key groove (20) arranged on the inner wall of the second shaft hole (44), and a second transmission member (18) mounted on the first rotating shaft (9); the annular groove (19) and the second key groove (20) are arranged in sequence along the axial direction of the first rotating shaft (9), and the annular groove (19) is connected to the second key groove (20); the second transmission member (18) slides in the second key groove (20) or the annular groove (19).

2. The polar transport landing craft according to claim 1, characterized in that: The transmission mechanism further comprises a transmission gear set located between the adjacent first expansion piece (41) and the second expansion piece (42), the transmission gear set comprising a first gear (15), a second gear (16) and a third gear (17), the first gear (15) and the third gear (17) being sleeved on the first rotating shaft (9), the first gear (15) being mounted on the first rotating shaft (9) and close to the first expansion piece (41), the second gear (16) being rotatably mounted on one end of the second expansion piece (42) close to the first expansion piece (41), the third gear (17) being mounted on one end of the second expansion piece (42) close to the first expansion piece (41), the first gear (15) and the second gear (16) being external gears, the third gear (17) being an internal gear, the second gear (16) being meshed with the third gear (17), and when the second transmission member (18) is in the annular groove (19), the first gear (15) is meshed with the second gear (16).

3. The polar transport landing craft according to claim 2, characterized in that: The support member (10) is a hollow cylindrical structure; the support member (10) is sleeved on the first rotating shaft (9); the first gear (15), the second gear (16) and the third gear (17) are arranged inside the support member (10).

4. The polar transport landing craft according to claim 2, characterized in that: It also comprises a first steering gear (11), the first steering gear (11) being mounted on the bracket (2), the driving end of the first steering gear (11) being connected to the first rotating shaft (9) and being used for driving the first rotating shaft (9) to move along the axial direction of the first rotating shaft (9).

5. The polar transport landing craft according to claim 1, characterized in that: The length of the annular groove (19) is greater than the length of the second transmission member (18), and the sum of the lengths of the second key groove (20) and the annular groove (19) is less than or equal to the length of the first key groove (13).

6. The polar transport landing craft according to claim 1, characterized in that: The polar transport landing craft further comprises a second steering gear (7), wherein the second steering gear (7) is mounted on the bracket (2), and a driving end of the second steering gear (7) is connected to the connecting rod (6).

7. The polar transport landing craft according to claim 1, characterized in that: The first rudder blade (4) is arranged on both sides of the second rudder blade (5).

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