Small inland waterway vessel

Abstract

A small inland river hull comprises a main hull, a gearbox, a main engine and a propeller are arranged in the main hull, the bottom of the main hull is convex downward to form a single tail fin, the center line of the output shaft of the gearbox is located in the belly of the single tail fin, and the output shaft is arranged horizontally, and the lower half of the gearbox is located in the belly of the single tail fin; a passenger cabin or a cargo hold is arranged in the middle of the main hull, and a driving platform is arranged at the tail of the main hull. The present invention provides a small inland river hull, which optimizes the arrangement of the gearbox and the main engine, does not occupy too much space in the passenger cabin or cargo hold, and allows the passenger (cargo) area to have a larger area, while ensuring the stability of the hull movement.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a small inland river hull. Background Art

[0002] Existing medium and large inland river ships are generally equipped with work boats, which are used for transportation and small-volume cargo transfer when the ship is not docked at the quay or pontoon dock, or when personnel need to travel between ships or between ships and shore, or when small quantities of materials need to be circulated. Such small passenger (cargo) ships are widely used and in large quantities. However, the reality is that the design and construction of such ships are generally very arbitrary, and the stability, operation, performance and layout are all uneven. There are many such small passenger (cargo) ships without stability standards, and small boats frequently capsize, causing serious property and human life and property losses. Existing ships of this type generally have a small depth, but require a higher speed, a larger main engine power match, and a larger propeller diameter. The conventional design is to tilt the propeller shaft system, and install the gearbox and the main engine at an angle, which is not conducive to the stability of the gearbox and the main engine, and increases vibration and noise, which is a pain point that is difficult to solve for such small ships with small depths. In the existing small ships of this type, due to their small size, most of the propulsion main engines use hanging propellers. Since the hanging propeller is installed at the stern, the driver needs to stand at the stern to operate it. The center of gravity of the driver is high when standing, and the safety and reliability are poor. It is generally only suitable for smaller power.

[0003] In this way, it is a good choice for small passenger (cargo) ships to install the gearbox and the main engine in the cabin. Compared with the use of a larger power propulsion main engine, it is impossible to arrange the hanging propeller because the weight is larger than the hanging propeller and the machine size is larger. The area for installing the gearbox and the propulsion main engine can only be set up in the main hull of the small boat. Therefore, the area of ​​the gearbox and the main engine occupies the limited passenger (cargo) area of ​​the boat. In addition, this type of small ship needs to set up the bow and stern deck area for people to get on and off the ship. Because the size of the small boat is limited, but a larger diameter propeller is required. The principle that the larger the propeller diameter, the higher the propulsion efficiency is recognized by the industry. Generally, the propeller axis is tilted, and the gearbox and the main engine are also tilted. Such an arrangement is not conducive to the safe operation of the propulsion main engine and also reduces the propeller propulsion efficiency. In addition, it is necessary to set up a control device to steer, the gearbox reverse clutch and the control of the main engine acceleration and deceleration need to occupy a part of the space. In this way, the limited space that is already small is very little, and the difficulty of arrangement has become a major problem for this type of small ship.

[0004] Therefore, the main problem to be solved by the present invention is: how to find a more reasonable optimization combination so that the arrangement of the tail shaft and tail tube assembly and the driving device, gear box and main engine will not occupy too much space in the passenger cabin or cargo hold, so that the passenger (cargo) area has a larger area, while ensuring the stability of the hull movement.

[0005] In addition, the secondary problem to be solved by the present invention is that a small passenger (cargo) ship needs to be equipped with signal equipment and two searchlights. On such a small ship, due to the stability requirements, there should not be a superstructure or deckhouse with a large windward area and to ensure stability margin in order to reduce the center of gravity height of the ship. Generally, the canopy and deckhouse are not designed, so the arrangement of searchlights and signal lights needs to be specially designed before they can be arranged. This problem also requires exploratory design and cannot be ignored.

[0006] The next important question is: small ships should have buoyancy. When the small ship fails and tilts, it can still be a buoyant body with buoyancy. In addition, when people ride in such a small ship, they all wear life jackets to ensure that when they encounter a tilt, the people attached to the buoyancy can be safe. At the same time, the boat has buoyancy to ensure that property losses are minimized. The buoyancy body is permanently set, and the buoyancy provided by the buoyancy body is required to be greater than or equal to 110% of the weight of the empty ship; while solving all the above technical problems, it is necessary to focus on the optimization of the layout of the buoyancy body, and it is also a top priority to take into account the overall layout of the whole ship. In addition, the main dimensions of small ships are very small, and how to cleverly optimize the layout of the rudder equipment as much as possible to maximize the area of ​​the cabin (cargo hold) is also one of the factors that must be carefully considered. Summary of the invention

[0007] In view of the technical problems existing in the background technology, the present invention provides a small inland river hull, which optimizes the layout of the gearbox and the main engine, does not occupy too much space in the passenger cabin or cargo hold, and allows the passenger (cargo) area to have a larger area, while also ensuring the stability of the hull movement.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve:

[0009] A small inland river hull comprises a main hull, wherein a gear box, a main engine and a propeller are arranged inside the main hull, the bottom of the main hull bulges downward to form a single tail fin, the center line of the output shaft of the gear box is located in the abdominal cavity of the single tail fin, and the output shaft is arranged horizontally, and the lower half of the gear box is located in the abdominal cavity of the single tail fin; a passenger cabin or a cargo hold is arranged in the middle of the main hull, and a driving platform is arranged at the stern of the main hull.

[0010] In the preferred scheme, the length of the main hull is L, L≤20m, the width of the main hull is B, B=0.2~0.3L, the depth of the main hull is D, D=0.4~0.6B, the bow of the main hull is provided with a bow deck, and the stern of the main hull is provided with a stern deck, the length of the bow deck is 0.1~0.2L, and the length of the stern deck is 0.06~0.15L. The bow deck is used for personnel boarding and disembarking and ship mooring operations; a driving platform is provided on the stern deck, and the height of the driving platform is below the stern deck; a bow buoyancy tank and a stern buoyancy tank are respectively provided at the bow and stern of the main hull, and the driving control platform is arranged between the stern buoyancy tank and the gear box.

[0011] In the preferred solution, the bow deck and the stern deck are both provided with transverse bulkheads, which extend to the bottom of the ship to form a watertight buoyancy compartment. A strong deck is provided on the right and starboard sides between the bow deck and the stern deck, and the width of the strong deck is 0.6~1.0B.

[0012] In a preferred solution, a tail steering gear platform is provided at the tail of the main hull, a rudder device assembly is provided on the tail steering gear platform, and the steering gear of the rudder device assembly is installed within the frame of the tail steering gear platform.

[0013] In a preferred solution, a searchlight mast is provided at the rear of the main hull, on which a searchlight is provided; a signal light mast is provided at the middle of the main hull, on which a signal light is provided.

[0014] In the preferred scheme, the searchlight mast comprises an upper searchlight mast and a lower searchlight mast, which are hinged to each other and fixed by locking bolts; a bearing seat is provided on the upper searchlight mast, a hollow cylinder is rotatably provided on the bearing seat, the hollow cylinder is connected to the searchlight through a support frame, the searchlight and the support frame are rotatably matched, a lifting rod is inserted in the middle of the hollow cylinder, the lifting rod is hinged to the searchlight through a steering rod for elevation adjustment, a sliding rod and a sliding groove are used between the bottom end of the lifting rod and the grip rod, a handle is provided at one end of the grip rod, the other end of the grip rod is hinged to the steering rod for horizontal angle adjustment, the steering rod for horizontal angle adjustment is connected to the hollow cylinder, a locking screw is provided on the connection of the hollow cylinder, and the locking screw is used to fix the lifting rod.

[0015] In a preferred solution, the signal light mast comprises an upper signal light mast and a lower signal light mast, the upper signal light mast and the lower signal light mast are hinged and fixed by locking bolts; the upper signal light mast is located in the middle of the cabin or cargo hold; a signal light is arranged on the upper signal light mast.

[0016] In a preferred solution, left and right lights are arranged beside the left and right hatch coamings at the bow of the main hull, and a tail light is arranged at the stern of the main hull.

[0017] In a preferred embodiment, the longitudinal section contour line of the downward convex single tail fin includes the bottom line of the downward convex single tail type line, inner and outer angle lines and the tail end circle line. The bottom line of the downward convex single tail type line and the inner and outer angle lines are all arc-shaped smooth curves, the tail end circle line is a straight line segment, and the inner and outer angle lines are the lines connecting the downward convex single tail fin and the main hull; the upward-looking contour line of the downward convex single tail fin is a fusiform line with long pointed ends; the maximum width of the downward convex single tail fin is equal to 1.2 to 1.5 times the width of the gear box, and the length of the downward convex single tail fin is 3.0 to 5.0 times the sum of the gear box length, the elastic coupling length and the main engine length.

[0018] This patent can achieve the following beneficial effects:

[0019] 1. The present invention provides a small inland river hull, which optimizes the arrangement of the gearbox and the main engine, does not occupy too much space in the passenger cabin or cargo hold, and allows a larger passenger (cargo) area while ensuring the stability of the hull movement.

[0020] 2. This type of ship can be equipped with a powerful main engine and a large-diameter propeller. The main engine installation inclination angle can be reduced to make it run smoothly, and a larger space can be freed up in the engine room. The downward convex single-stern hull line with the advantage of good speed has broad prospects for application in inland waters. At the same time, it provides a safe and applicable auxiliary operation workboat for large and medium-sized ships.

[0021] 3. This type of ship is the first to install searchlights and signal lights on a small ship, and can ensure the stability of the hull without a canopy deck.

[0022] 4. Reasonable arrangement of buoyancy tanks can give this type of ship a greater carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] Figure 1 It is the front view of the present invention;

[0025] Figure 2 A top view of the present invention;

[0026] Figure 3 It is the layout diagram of each buoyancy compartment of the present invention;

[0027] Figure 4 This is a structural diagram of the connection between the searchlight and the searchlight mast of the present invention;

[0028] Figure 5 This is a structural diagram of the connection between the searchlight and the upper searchlight mast of the present invention;

[0029] Figure 6 for Figure 4 Middle A side view;

[0030] Figure 7 This is a structural diagram of a signal light mast of the present invention;

[0031] Figure 8 It is a longitudinal section outline diagram of a single tail fin of the present invention;

[0032] Fig. 9 The single tail fin main hull baseline contour line diagram of the present invention;

[0033] Fig.10 It is a cross-sectional outline diagram of a single tail fin of the present invention;

[0034] Fig.11 The figure is a size ratio diagram between the single tail fin and the main hull of the present invention.

[0035] In the figure: main engine 1, gear box 2, passenger cabin 3, bow buoyancy tank 4, stern buoyancy tank 5, driving platform 6, double bottom buoyancy tank 7, searchlight 8, signal light 9, bearing seat 10, hollow cylinder 11, support frame 12, lifting rod 13, steering rod for elevation adjustment 14, grip rod 15, handle 16, steering rod for horizontal angle adjustment 17, locking screw 18, bottom line of downward convex single tail type line 101, inner and outer angle lines 102, tail end circle line 103, bottom line of downward convex single tail type line 104, main hull baseline 105, and center line of shafting 106. DETAILED DESCRIPTION

[0036] Embodiment 1:

[0037] The preferred solution is Figures 1 to 7 As shown, a small inland river hull includes a main hull, a gearbox and a main engine are arranged in the main hull, the output shaft of the gearbox is used to drive the propeller to rotate, the bottom of the main hull bulges downward to form a single tail fin, that is, a downward convex single tail, and the shaft system is arranged in the downward convex single tail, that is, the center line of the output shaft of the gearbox is located in the belly of the single tail fin, and the output shaft is arranged horizontally, and the lower half of the gearbox is located in the belly of the single tail fin; a passenger cabin or a cargo hold is arranged in the middle of the main hull, and a driving platform is arranged at the tail of the main hull. The gearbox and the main engine are arranged in the cabin at the front end of the tail shaft, so that the center of gravity height of the main engine will be greatly reduced, so that the overall center of gravity height of the small ship of the present invention is lowered, which is conducive to improving the stability margin of the small ship. The horizontally arranged axis is better than the inclined axis, which can avoid the defects of unstable operation and large vibration caused by the inclined installation of the gearbox and the main engine.

[0038] The length of the main hull is L, L≤20m, the width of the main hull is B, B=0.2~0.3L, the depth of the main hull is D, D=0.4~0.6B, the bow of the main hull is provided with a bow deck, the stern of the main hull is provided with a stern deck, the length of the bow deck is 0.1~0.2L, the length of the stern deck is 0.06~0.15L, the bow deck is used for boarding and disembarking personnel and for ship mooring operations; a driving platform is provided on the stern deck, and the height of the driving platform is located below the stern deck; the bow and stern of the main hull are respectively provided with a bow buoyancy tank and a stern buoyancy tank, and the driving control platform is provided between the stern buoyancy tank and the gear box. Specifically, the driving control platform is provided between the front of the stern buoyancy tank box of the double hull with the stern sealing plate facing forward and the gear box.

[0039] The bow deck and the quarter deck are both equipped with transverse bulkheads, which extend to the bottom of the ship to form a watertight buoyancy compartment. Strong decks are set on the right and starboard sides between the bow deck and the quarter deck, and the width of the strong deck is 0.6~1.0B.

[0040] The height of the control console is set below the main deck. The platform has a certain height from the bottom of the ship, and forms a buoyancy body with the hull at this height. The buoyancy body has the effect of increasing the buoyancy of the ship. The reduction of the platform height can reduce the overall center of gravity of the equipment and the driver, which is beneficial to stability. The control console is installed in the front position of this platform. There is enough operating position for the driver between the control console and the front of the double-hull stern buoyancy tank with the stern cover forward, which can be operated conveniently. There is a good driving sight in front of the control console. The control console includes a steering device. The driver can turn the rudder blade from 35° on one side to 35° on the other side through the steering gear direction control to make the ship move forward or backward, and adjust the course or turn around. Including the gearbox forward and backward clutch or parking; the acceleration and deceleration of the main engine, all operations are integrated with the control console. This arrangement is convenient to operate and reasonably optimizes the overall layout of small ships.

[0041] A tail steering gear platform is arranged at the tail of the main hull, a rudder device assembly is arranged on the tail steering gear platform, and the steering gear of the rudder device assembly is installed in the frame of the tail steering gear platform.

[0042] A searchlight mast is arranged at the rear of the main hull, on which a searchlight is arranged; a signal light mast is arranged in the middle of the main hull, on which a signal light is arranged.

[0043] The searchlight mast comprises an upper searchlight mast and a lower searchlight mast, which are hinged to each other and fixed by locking bolts; a bearing seat is provided on the upper searchlight mast, a hollow cylinder is rotatably provided on the bearing seat, the hollow cylinder is connected to the searchlight through a support frame, the searchlight and the support frame are rotatably matched, a lifting rod is inserted in the middle of the hollow cylinder, the lifting rod is hinged to the searchlight through a steering rod for elevation adjustment, a sliding rod and a sliding groove are used between the bottom end of the lifting rod and the grip rod, a handle is provided at one end of the grip rod, the other end of the grip rod is hinged to the steering rod for horizontal angle adjustment, the steering rod for horizontal angle adjustment is connected to the hollow cylinder, a locking screw is provided on the connection of the hollow cylinder, and the locking screw is used to fix the lifting rod. The searchlight mast can be folded. When there is an obstacle ahead, the searchlight can be folded from top to bottom to lower the clearance height. The searchlight can rotate 360° and the elevation angle can be adjusted up and down, so that it can illuminate any target during night flight according to the driver's intention, thereby ensuring night flight safety. The structure of the hollow tube is not a standard cylindrical shape, and the diameter of the outer wall is a variable diameter design. The design purpose of the hollow tube is to ensure that the hollow tube drives the support frame to rotate together, and drives the hollow tube to rotate driven by the steering rod for horizontal angle adjustment.

[0044] The signal light mast is located in the middle of the cabin or cargo hold; the signal light mast includes an upper signal light mast and a lower signal light mast, the upper signal light mast and the lower signal light mast are hinged and fixed by locking bolts; the upper signal light mast is located in the middle of the cabin or cargo hold; a signal light is arranged on the upper signal light mast. The signal light mast can be folded, and when there is an obstacle in front, the searchlight is folded from top to bottom to lower the clearance height.

[0045] Port and starboard lights are arranged beside the port and starboard hatch coamings at the bow of the main hull, and a tail light is arranged at the stern of the main hull.

[0046] Specifically, in order to solve the technical problem of the small ship sailing at night in the rapids section, a signal light must be set. The present invention arranges left red and right green edge lights beside the left and right hatch coamings of the bow, and arranges a signal light mast. The signal light mast is arranged in the middle of the double bottom of the passenger (cargo) ship. A signal light is arranged on the signal light mast. The upper end of the mast is connected to the lower end by a hinge arranged in the middle, and the mast can be quickly and conveniently flipped by the hinge to sleep. When the navigation needs to pass through the waters that are not high enough for the ship to pass, the method of sleeping the mast is adopted. This mast arrangement position is to arrange the mast in the middle of the cross section of the ship, at a position far away from the two sides of the ship, so that it will not collide with other ships or docks during navigation, thereby ensuring the reliability of the signal lamps and lanterns, thereby ensuring the safety of night navigation.

[0047] There are two searchlights in the present invention. Since the ship of the present invention has no deck house and no canopy deck, the searchlights cannot be installed in the form of conventional ships. Therefore, the searchlights are installed on both sides of the driving control platform of the small ship, and a special searchlight mast is set. The driver can conveniently manually operate the searchlight handle to realize the searchlight irradiation direction according to the driver's wishes, thereby ensuring night navigation safety.

[0048] The main power supply of this small passenger (cargo) ship is supplied by 2 sets of energy storage batteries. Since the single voyage time of this ship is less than 2 hours, the charging power is provided by the medium and large ships themselves. When the ship is in operation, it is lifted by the davit through the steel cable and arranged in the appropriate position of the medium and large ships. When the ship needs to be operated, the davit is lowered into the waters through the steel cable, and personnel get on and off this small passenger (cargo) ship through the boarding ladder.

[0049] like Figure 8-11 As shown, the line structure of the single tail fin is as follows: the longitudinal section contour line of the downward convex single tail fin includes the bottom line of the downward convex single tail line, the inner and outer corner lines and the tail end circle line. The bottom line of the downward convex single tail line and the inner and outer corner lines are arc-shaped smooth curves, the tail end circle line is a straight line segment, and the inner and outer corner lines are the lines connecting the downward convex single tail fin and the main hull; the upward-looking contour line of the downward convex single tail fin is a fusiform line with long sharp ends; the maximum width of the downward convex single tail fin is equal to 1.2~1.5 times the width of the gearbox, and the length of the downward convex single tail fin is 3.0~5.0 times the sum of the length of the gearbox plus the length of the elastic coupling plus the length of the main engine. Further, the horizontal line tangent to the lowest end of the bottom line of the downward convex single tail line is the bottom baseline of the downward convex single tail line; the height between the bottom baseline of the downward convex single tail line and the main hull baseline is the height of the downward convex single tail fin, and the center line of the propeller shaft system is located in the same horizontal plane as the main hull baseline or lower than the main hull baseline. The height of the downward convex single tail fin is 2.5 to 4.0 times the height of the main hull. Figure 3As shown, H1 = (1.2-1.5) * H2. The tail end face of the downward convex single tail fin is circular, and the diameter of the tail end face is equal to the diameter of the tail tube of the output shaft of the reduction gearbox. The distance L3 between the tail end face of the downward convex single tail fin and the stern = the leading edge of the rudder blade + the gap between the propeller and the leading edge of the rudder blade + the length of the propeller + the length of the sealing device + the extension length of the tail tube + the length determined by the appropriate gap. The end face of the downward convex single tail fin is an inclined thin column facing forward and upward. The cross-section of the overall downward convex single tail forms a teardrop shape, the waterline surface is a shuttle streamline, the longitudinal section is a sharp and thin drooping arc streamline, the first section is a sharp and thin shuttle streamline, and the end of the tail section is tilted upward, so that the tail section and the end face are circularly transitioned into a rounded teardrop shape. In this way, the width of the overall downward convex single tail fin is only 1.2~1.5 times the width of the gearbox, which can form a downward convex single body line that makes the propeller flow smooth and has very small viscous pressure resistance. The connection with the main hull adopts a smooth connection with left and right angle lines. The spacing H3 between the main hull baseline and the bottom of the hull at the rear is equal to 1 / 2 of the propeller diameter plus the gap between the propeller and the bottom plate. The downward convex single tail fin of the present invention reduces the height of the center line of the shaft system, and the bottom of the hull at the rear is only slightly raised. With the center line of the shaft system as the center of the circle, the propeller radius + the required clearance with the bottom plate of the ship can use a propeller with a larger diameter. The gearbox and the main engine connected to the gearbox sink to the belly of the downward convex single tail fin to lower the center of gravity of the hull, which is beneficial to increase the stability margin of the ship. The gearbox and the main engine of the existing single tail fin ship are all located at the bottom baseline of the downward convex single tail line. The downward convex single tail fin of the present ship is convex downward, so that the gearbox and the lower half of the main engine are located in the belly of the downward convex single tail fin.

[0050] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A small inland river hull, comprising a main hull, a gearbox, a main engine and a propeller are arranged in the main hull, characterized in that: The bottom of the main hull bulges downward to form a single tail fin, the centerline of the output shaft of the gearbox is located in the belly of the single tail fin, and the output shaft is arranged horizontally, and the lower half of the gearbox is located in the belly of the single tail fin; a passenger cabin or a cargo hold is provided in the middle of the main hull, and a driving platform is provided at the tail of the main hull; The length of the main hull is L, L≤20m, the width of the main hull is B, B=0.2~0.3L, the depth of the main hull is D, D=0.4~0.6B, a bow deck is provided at the bow of the main hull, and a stern deck is provided at the stern of the main hull. The length of the bow deck is 0.1~0.2L, and the length of the stern deck is 0.06~0.15L. The bow deck is used for boarding and disembarking of personnel and for ship mooring operations; a driving platform is provided on the stern deck, and the height of the driving platform is located below the stern deck; a bow buoyancy tank and a stern buoyancy tank are provided at the bow and stern of the main hull respectively, and the driving control platform is provided between the stern buoyancy tank and the gear box; Both the bow and the quarter decks are equipped with transverse bulkheads, which extend to the bottom of the ship to form a watertight buoyancy compartment. Strong decks are set on the right and starboard sides between the bow and quarter decks, and the width of the strong decks is 0.6~1.0B; A searchlight mast is arranged at the rear of the main hull, on which a searchlight is arranged; a signal light mast is arranged in the middle of the main hull, on which a signal light is arranged; The searchlight mast comprises an upper searchlight mast and a lower searchlight mast, the upper searchlight mast and the lower searchlight mast are hinged and fixed by locking bolts; a bearing seat is provided on the upper searchlight mast, a hollow cylinder is rotatably provided on the bearing seat, the hollow cylinder is connected to the searchlight through a support frame, the searchlight and the support frame are rotatably matched, a lifting rod is inserted in the middle of the hollow cylinder, the lifting rod is hinged to the searchlight through a steering rod for elevation adjustment, a sliding rod and a sliding groove are matched between the bottom end of the lifting rod and the grip rod, a handle is provided at one end of the grip rod, the other end of the grip rod is hinged to the steering rod for horizontal angle adjustment, the steering rod for horizontal angle adjustment is connected to the hollow cylinder, a locking screw is provided on the connection of the hollow cylinder, and the locking screw is used to fix the lifting rod; The line structure of the single tail fin is as follows: the longitudinal section contour line of the downward convex single tail fin includes the bottom line of the downward convex single tail line, the inner and outer angle lines and the tail end circle line. The bottom line of the downward convex single tail line and the inner and outer angle lines are all arc-shaped smooth curves, the tail end circle line is a straight line segment, and the inner and outer angle lines are the lines connecting the downward convex single tail fin and the main hull; the upward-looking contour line of the downward convex single tail fin is a fusiform line with long pointed ends; the maximum width of the downward convex single tail fin is equal to 1.2~1.5 times the width of the gearbox, and the length of the downward convex single tail fin is 3.0~5.0 times the sum of the gearbox length plus the elastic coupling length plus the main engine length.

2. The small inland river boat according to claim 1, characterized in that: A tail steering gear platform is arranged at the tail of the main hull, a rudder device assembly is arranged on the tail steering gear platform, and the steering gear of the rudder device assembly is installed in the frame of the tail steering gear platform.

3. The small inland river boat according to claim 1, characterized in that: The signal light mast comprises an upper signal light mast and a lower signal light mast, the upper signal light mast and the lower signal light mast are hinged and fixed by locking bolts; the upper signal light mast is located in the middle of the cabin or cargo hold; a signal light is arranged on the upper signal light mast.

4. The small inland river boat according to claim 1, characterized in that: Port and starboard lights are arranged beside the port and starboard hatch coamings at the bow of the main hull, and a tail light is arranged at the stern of the main hull.

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