V-shaped multi-section flat bottom type racing boat and preparation process thereof

Abstract

The invention belongs to the technical field of racing boats for water sports, and aims to provide a V-shaped multi-section flat bottom type racing boat which comprises a boat body, and a multi-section flat bottom type structure is arranged at the bottom of the boat body; the boat body comprises a front deck and a tail deck, a front cover sharp corner is arranged on the front deck, a paddle frame is arranged above the front cover sharp corner, the top end of the paddle frame is connected with a paddle frame head, and the paddle frame head is connected with a paddle bolt; a sliding seat is arranged at the rear end of the paddle frame, a flat plate is arranged at the rear end of the sliding seat, and the sliding seat and the flat plate are connected to form a seat cabin; side rack sliding rails are arranged on the two sides of the front end of the tail deck, and a pedal plate is arranged between the side rack sliding rails. The rowboat has the characteristics of compact structure, good streamline, small advancing resistance and the like, is integrally formed by a mold, is matched with preparation methods of three-layer material distribution, sectional medium-temperature curing and the like, has the characteristics of simple production process, environment-friendly production process, high production efficiency and the like, and can be widely applied to the technical field of rowboat production.

Description

Technical Field

[0001] The present invention belongs to the technical field of rowing boats for water sports. Specifically, it is a V-shaped multi-section flat-bottom rowing boat and its manufacturing process. Background Art

[0002] Single scull racing is one of the traditional Olympic events. Athletes row with their backs to the direction of the boat's forward movement, using the strength of their muscles to row through the simple lever action of the oars and oarlocks, making the boat move forward. For the competition, time is the only criterion for victory or defeat. Sometimes a difference of 0.1 second can change the outcome of a race. Therefore, shortening the time is particularly important for athletes.

[0003] Traditional rowing boats usually consist of a main hull, a keel, ribs, front and rear decks, and an inner cabin structure, etc. The inner cabin structure mainly includes a foot cabin and a cockpit composed of partitions, flat plates, and support bars. The manufacturing process of rowing boats is relatively complex, requiring multiple pre-treatments, multiple curing processes, and complex post-treatment processes. The structure of rowing boats is complex, the labor intensity of production personnel is high, the production cycle is long, and the cost is high. Since the upper hull and the lower hull are cured separately, the accuracy requirements for their later fitting manufacturing process are very high, the breakage rate is high, and it is easy to rework due to incorrect dimensions.

[0004] At present, there are many introductions about the structure and production process of racing boats and single-person racing boats. For example, patent application number "201821749132.4" introduces a single-person racing boat, including a racing boat body, a seat cabin is recessed inward on the racing boat body, and the racing boat body is provided with an integrally formed and smoothly transitioned bow, hull and stern. The bow and stern are both narrow front structures. The drainage process in the seat cabin is realized through a drainage device. It is easy to operate and use, reduces the wave-breaking board and drainage pump device, and reduces the weight of the racing boat. For example, patent application number "202011191051.9" discloses a racing boat with polymer materials and a preparation method thereof, including a hull, and the hull includes an inner fiber prepreg layer, an aramid honeycomb sandwich, a PVC inner plate, and an outer fiber prepreg layer that are sequentially bonded from the inside to the outside. The steps of the production method include: the painting treatment step includes painting, baking paint, and polishing in sequence. The racing boat has the characteristics of novel structure, low cost, and friction resistance. For example, patent application number "202311489925.2" introduces a wing-shaped oar frame and a racing boat, including a main oar frame, one end of which is provided with a connecting frame connected to the blades, and the main oar frame is rotatably connected to the mounting seat; an auxiliary oar frame is provided between the main oar frame and the mounting seat. This scheme uses the Bernoulli principle to make the cross-section of the main oar frame "wing-shaped", change the pressure on the upper and lower surfaces of the main oar frame, so that the main oar frame is subjected to an upward thrust during the movement, and then the racing boat as a whole is subjected to an upward thrust, reducing the resistance of the racing boat, allowing athletes to achieve better results. However, the bottom line of existing single-person racing boats is mostly an arc-shaped structure, which will generate resistance due to the swing of the boat during the marching competition, affecting the competition results; in addition, the existing single-person racing boat manufacturing process is relatively cumbersome and costly, and the product manufacturing stability is relatively poor.

[0005] In view of this, studying a new structure of single-person racing rowing to reduce the resistance generated when the boat swings will be beneficial to improving competition results; in addition, introducing new preparation process methods to further reduce the production cost of the rowing and improve process stability will be of great value to the further promotion of rowing. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a V-shaped multi-section flat-bottomed racing boat and a preparation process thereof. The V-shaped multi-section flat-bottomed racing boat has the characteristics of compact structure, good streamline, and small running resistance. The preparation method adopts integral molding of a mold, combined with three-layer cloth, segmented medium-temperature curing and other preparation methods. It has the characteristics of simple production process, environmentally friendly production process and high production efficiency, and can be widely used in the field of racing boat production technology.

[0007] To solve the above problems, the V-shaped multi-section flat-bottomed rowing boat of the present invention includes a boat body, and a multi-section flat-bottomed structure is provided at the bottom of the boat body; the boat body includes a front deck and a rear deck, a front cover sharp corner is provided on the front deck, an oar rack is provided above the front cover sharp corner, the top end of the oar rack is connected to an oar rack head, and the oar rack head is connected to an oar bolt; a sliding seat is provided at the rear end of the oar rack, a flat plate is provided at the rear end of the sliding seat, and the sliding seat and the flat plate are connected to form a seat cabin; side rack slide rails are provided on both sides at the front end of the rear deck, and a footrest plate is provided in the middle of the side rack slide rails.

[0008] As an improvement of the present invention, the bottom of the boat body is a V-shaped multi-section flat-bottomed structure, and both sides are provided with angular structures.

[0009] As an improvement of the present invention, the angular structure includes a section of arc surface structure, a section of vertical inclined surface structure and a section of horizontal inclined surface structure, the arc surface structure is an inward arc, the included angle between the vertical inclined surface structure and the vertical direction is less than 60°, and the included angle between the horizontal inclined surface structure and the horizontal direction is less than 10°.

[0010] As an improvement of the present invention, the boat body is composed of three-layer structures of an inner layer, an intermediate layer and an outer layer.

[0011] As an improvement of the present invention, an anti-collision ball is provided on the top of the front deck.

[0012] As an improvement of the present invention, a stabilizing rudder is provided at the bottom of the rear deck, and the stabilizing rudder has a trapezoidal thin surface structure.

[0013] The present invention also provides a preparation method for the above-mentioned V-shaped multi-section flat-bottomed rowing boat, which specifically includes the following steps:

[0014] (1) Material selection: Select materials according to the performance requirements of the inner layer, intermediate layer and outer layer respectively. Among them, the inner layer uses lightweight PVC foam or PMI foam core material to reduce the weight of the boat body, the intermediate layer uses aramid fiber or glass fiber reinforced epoxy resin to improve the impact resistance of the boat body, and the outer layer uses high modulus carbon fiber prepreg to improve the load-bearing strength of the boat body and reduce the weight of the boat body;

[0015] (2) Mold preparation: According to the design drawings of the rowing boat, use a numerical control machine tool to process an aluminum alloy male mold and a female mold, and at the same time polish the surface to mirror precision;

[0016] (3) Boat body forming: Layer by layer lay the inner layer, intermediate layer and outer layer with a specified thickness on the surface of the prepared male mold. Among them, the intermediate layer and the outer layer are alternately laid at 0°, 45° and 90°, and a vacuum bag pressing is used to remove air bubbles and improve the density; after laying, a high-temperature curing process is used to obtain a boat body blank, and the curing temperature fluctuation needs to be ≤±2°C to avoid uneven resin curing;

[0017] (4) Skeleton and fitting assembly: The keel, ribs are adhesively bonded to the hull using epoxy resin or mechanically fastened with bolts and rivets. The cockpit slide rail system is fixed inside the hull through an aluminum alloy bracket, and oar racks and footrest fittings are installed. The horizontal height error of the oar racks on both sides is ≤ 1 mm;

[0018] (5) Surface treatment: Grind and polish the hull, and spray anti-ultraviolet varnish or personalized coating;

[0019] (6) Performance test: Check whether the joints of the hull are water-leaking. Apply a pressure of 0.1 MPa and maintain the pressure for 5 minutes without leakage. Ensure that the hull is symmetrical left and right to avoid yaw; Check the weight balance of the hull, and the weight difference of the whole boat is ≤ 0.5%.

[0020] As an improvement of the present invention, in the step (2), a honeycomb sandwich structure or 3D printed alloy components are used to prepare the male mold and the female mold to improve the mold forming efficiency.

[0021] As an improvement of the present invention, in the step (3), the inner layer thickness is 5 - 30 mm, the middle layer thickness is 3 - 15 mm, the outer layer thickness is 0.5 - 5 mm, and strain sensors are embedded when laying the middle layer to monitor the stress distribution of the hull in real time.

[0022] As an improvement of the present invention, in the step (3), the high-temperature curing process adopts a segmented curing process. First, pre-cure at a low temperature of 80 °C for 2 - 8 h, and then finally cure at a high temperature of 130 °C for 2 - 6 h.

[0023] The beneficial effects of the present invention are as follows: A V-shaped multi-section flat-bottomed racing boat and its preparation process have the characteristics of compact structure, good streamline, and small traveling resistance. By designing the bottom of the racing boat as a V-shaped multi-section flat-bottom structure with angular styles on both sides, it helps the boat move straight forward during traveling, reduces the resistance generated by the boat swing, and improves the race performance; Designed in combination with aspects such as the buoyancy support of water and the forward inertia of the racing boat, it reduces the forward resistance caused by the undulating posture during the rowing process of the racing boat, increases the inertia of the boat rowing, reduces the loss of athletes' strength, and thus improves the rowing speed of the boat.

[0024] The preparation method of the present invention includes processes such as material selection, mold preparation, hull forming, skeleton and fitting assembly, surface treatment, and performance test. By using advanced 3D printing technology to prepare the mold, the mold preparation accuracy and efficiency are improved; The hull adopts a three-layer laying structure of an inner layer, a middle layer, and an outer layer, effectively reducing the weight of the hull by 15 - 30%, while ensuring the impact resistance strength of the hull. Description of the Drawings

[0025] Figure 1 : The front view of the V-shaped multi-section flat-bottomed racing boat of the present invention;

[0026] Figure 2 : Top view of the V-shaped multi-section flat-bottomed rowing boat of the present invention;

[0027] Figure 3 : Side view of the V-shaped multi-section flat-bottomed rowing boat of the present invention

[0028] Figure 4 : Schematic cross-sectional structure diagram of the V-shaped multi-section flat-bottomed rowing boat of the present invention;

[0029] Figure 5 : Process flow chart for the preparation of the V-shaped multi-section flat-bottomed rowing boat of the present invention.

[0030] In the figure: 1, hull; 2, front deck; 3, rear deck; 4, front cover sharp corner; 5, oar rack; 6, oar rack head; 7, oar bolt; 8, sliding seat; 9, flat plate; 10, side rack slide rail; 11, footrest board; 12, angular structure; 13, anti-collision ball; 14, stabilizing rudder; 121, arc surface structure; 122, vertical inclined surface structure; 123, horizontal inclined surface structure; 21, inner layer; 22, middle layer; 23, outer layer. Detailed implementation manners

[0031] In order to better understand the above technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with embodiments.

[0032] As Figures 1 to 3 shown, the V-shaped multi-section flat-bottomed rowing boat of the present invention includes a hull 1, and a multi-section flat-bottomed structure is provided at the bottom of the hull 1; the hull 1 includes a front deck 2 and a rear deck 3, a front cover sharp corner 4 is provided on the front deck 2, an oar rack 5 is provided above the front cover sharp corner 4, the top end of the oar rack 5 is connected to an oar rack head 6, and the oar rack head 6 is connected to an oar bolt 7; a sliding seat 8 is provided at the rear end of the oar rack 5, a flat plate 9 is provided at the rear end of the sliding seat 8, and the sliding seat 8 and the flat plate 9 are connected to form a seating cabin; side rack slide rails 10 are provided on both sides of the front end of the rear deck 3, and a footrest board 11 is provided in the middle of the side rack slide rails 10.

[0033] Furthermore, the bottom of the hull 1 is a V-shaped multi-section flat-bottomed structure, and angular structures 12 are provided on both sides; specifically, the angular structure 12 includes an arc surface structure 121, a vertical inclined surface structure 122 and a horizontal inclined surface structure 123, the arc surface structure 121 is an inward arc, the angle between the vertical inclined surface structure 122 and the vertical direction is less than 60°, preferably 30-45°; the angle between the horizontal inclined surface structure 123 and the horizontal direction is less than 10°, preferably 3-8°; as Figure 2 shown, the whole hull is in a V-shaped structure, as Figure 3As shown in the figure, the side of the bottom of the hull has a multi-section angular structure. The composition angles of the corners are obtained through hydrodynamic calculations and are designed in combination with aspects such as the buoyancy support of water and the inertia of the rowing boat moving forward, reducing the forward resistance caused by the undulating posture during the rowing process of the rowing boat, increasing the inertia of the boat rowing, reducing the loss of the athlete's strength, thereby effectively improving the rowing speed of the boat and improving the competition results.

[0034] As Figure 4 shown, further, the hull is composed of three layers: an inner layer 21, an intermediate layer 22, and an outer layer 23; specifically, the inner layer 21 uses a lightweight PVC foam or PMI foam core material, the intermediate layer 22 uses aramid fiber or glass fiber reinforced epoxy resin, and the outer layer 23 uses a high-modulus carbon fiber prepreg; more specifically, the thickness of the inner layer 21 is 5-30 mm, preferably 10-20 mm, the thickness of the intermediate layer 22 is 3-15 mm, preferably 3-10 mm, and the thickness of the outer layer 23 is 0.5-5 mm, preferably 1-3 mm.

[0035] Further, a collision ball 13 is provided on the top of the front deck 2; specifically, the collision ball 13 is made of polyurethane or rubber and has a diameter of φ40-60 mm.

[0036] Further, a stabilizing rudder 14 is provided at the bottom of the rear deck 3, and the stabilizing rudder 14 has a trapezoidal thin surface structure; specifically, the stabilizing rudder 14 has a thin surface structure of a symmetric airfoil.

[0037] As Figure 5 shown, the present invention also provides a preparation method for the above V-shaped multi-section flat-bottom rowing boat, adopting a preparation process of layered laying and segmented curing, specifically including the following steps:

[0038] (1) Material selection: Select materials according to the performance requirements of the inner layer 21, the intermediate layer 22, and the outer layer 23 respectively. Among them, the inner layer 21 uses a lightweight PVC foam or PMI foam core material to reduce the weight of the hull, the intermediate layer 22 uses aramid fiber or glass fiber reinforced epoxy resin to improve the impact resistance of the hull, and the outer layer 23 uses a high-modulus carbon fiber prepreg to improve the load-bearing strength of the hull and reduce the weight of the hull;

[0039] (2) Mold preparation: According to the design drawings of the rowing boat, use a numerically controlled machine tool to process an aluminum alloy male mold and a female mold, and at the same time polish the surface to mirror precision;

[0040] (3) Hull Molding: Lay the inner layer 21, the middle layer 22, and the outer layer 23 with a specified thickness layer by layer on the prepared male mold surface. Among them, the middle layer 22 and the outer layer 23 are laid alternately at 0°, 45°, and 90°, and the vacuum bag pressing method is used to remove air bubbles to improve the density. After the laying is completed, the high-temperature curing process is adopted to obtain the hull blank. The curing temperature fluctuation should be ≤ ±2°C to avoid uneven resin curing;

[0041] (4) Assembly of Skeleton and Fittings: The keel, ribs are bonded to the hull, and epoxy resin or mechanical fastening with bolts and rivets is used. The cockpit slide rail system is fixed inside the hull through an aluminum alloy bracket, and accessories such as oar racks and footrests are installed. The horizontal height error of the oar racks on both sides is ≤ 1mm;

[0042] (5) Surface Treatment: Polish the hull and spray anti-ultraviolet varnish or personalized painting;

[0043] (6) Performance Testing: Check whether the joints of the hull are water-permeable. Apply a pressure of 0.1 MPa and keep the pressure for 5 minutes without leakage. Ensure that the hull is symmetrical left and right to avoid yaw; Check the weight balance of the hull, and the weight difference of the whole boat is ≤ 0.5%.

[0044] Further, in the step (2), a honeycomb sandwich structure or 3D printed alloy components are used to prepare the male mold and the female mold to improve the mold forming efficiency.

[0045] Further, in the step (3), the thickness of the inner layer 21 is 5 - 30 mm, the thickness of the middle layer 22 is 3 - 15 mm, and the thickness of the outer layer 23 is 0.5 - 5 mm. A strain sensor is embedded when laying the middle layer, and the stress distribution of the hull is monitored in real time through the strain sensor.

[0046] Further, in the step (3), the high-temperature curing process adopts a segmented curing process. First, pre-cure at a low temperature of 80°C for 2 - 8 h, and then cure at a high temperature of 130°C for 2 - 6 h.

[0047] The V-shaped multi-section flat-bottomed racing boat and its preparation method of the present invention are further introduced below with specific examples.

[0048] Example 1:

[0049] The V-shaped multi-section flat-bottomed racing boat in this example is prepared through the following steps:

[0050] (1) Material Selection: Select materials according to the performance requirements of the inner layer 21, the middle layer 22, and the outer layer 23 respectively. Among them, the inner layer 21 uses lightweight PVC foam to reduce the hull weight, the middle layer 22 uses aramid fiber-reinforced epoxy resin to improve the impact resistance of the hull, and the outer layer 23 uses high-modulus carbon fiber prepreg to improve the load-bearing strength of the hull and reduce the hull weight;

[0051] (2) Mold Preparation: According to the design drawings of the rowing boat, numerically controlled machine tools are used to machine the aluminum alloy male mold and female mold, and the surface is polished to mirror precision at the same time;

[0052] (3) Hull Molding: The 10-mm thick inner layer 21, 3-mm thick middle layer 22, and 0.8-mm thick outer layer 23 are laid layer by layer on the surface of the prepared male mold. Among them, the middle layer 22 and the outer layer 23 are laid alternately at 0° and 45°, and a vacuum bag press is used to remove air bubbles to improve the density; after laying, it is pre-cured at a low temperature of 80°C for 2 h, and then finally cured at a high temperature of 130°C for 2 h to obtain a hull blank. The curing temperature fluctuation needs to be ±2.0°C to avoid uneven resin curing;

[0053] (4) Assembly of Skeleton and Fittings: The keel, ribs are adhesively bonded to the hull, and epoxy resin is used for fastening. The cockpit slide rail system is fixed inside the hull through an aluminum alloy bracket, and fittings such as oarlocks and footrests are installed. The horizontal height error of the oarlocks on both sides is ≤1 mm;

[0054] (5) Surface Treatment: The hull is polished, and an anti-ultraviolet clear varnish or personalized coating is sprayed;

[0055] (6) Performance Testing: Check whether the joints of the hull are water-permeable. Apply a pressure of 0.1 MPa and keep the pressure for 5 minutes without leakage. Ensure that the hull is symmetric left and right to avoid yaw; check the weight balance of the hull. The weight difference of the whole boat is ≤0.5%.

[0056] The V-shaped multi-section flat-bottom rowing boat prepared through the above steps, after relevant tests, the drag coefficient is reduced to 28.929 N, the maximum speed is increased to 26.5 Km / h, and the strength of the hull is higher, reaching 150 MPa, improving the impact resistance performance, and the service life is significantly extended. The comparison table of effects and parameters is shown in Table 1.

[0057] Table 1 Comparison of Structural Parameters between Different Bottom Structures and the V-shaped Multi-section Flat-bottom Structure of the Present Invention

[0058]

[0059] Example 2:

[0060] The V-shaped multi-section flat-bottom rowing boat in this example is prepared through the following steps:

[0061] (1) Material Selection: Materials are selected respectively according to the performance requirements of the inner layer 21, the middle layer 22, and the outer layer 23. Among them, the inner layer 21 uses PMI foam core material to reduce the weight of the hull, the middle layer 22 uses glass fiber reinforced epoxy resin to improve the impact resistance of the hull, and the outer layer 23 uses high modulus carbon fiber prepreg to improve the load-bearing strength of the hull and reduce the weight of the hull;

[0062] (2) Mold preparation: According to the design drawings of the rowing boat, numerically controlled machine tools are used to process the aluminum alloy male mold and female mold, and the surface is polished to mirror precision at the same time;

[0063] (3) Hull forming: Layers of an inner layer 21 with a thickness of 20 mm, an intermediate layer 22 with a thickness of 5 mm, and an outer layer 23 with a thickness of 1.5 mm are laid on the surface of the prepared male mold layer by layer. Among them, the intermediate layer 22 and the outer layer 23 are laid alternately at 0° and 90°, and a vacuum bag press is used to remove air bubbles to improve the density; after laying, it is pre-cured at a low temperature of 80 °C for 4 h, and then finally cured at a high temperature of 130 °C for 4 h to obtain a hull blank. The curing temperature fluctuation needs to be ±1.5 °C to avoid uneven resin curing;

[0064] (4) Assembly of the skeleton and fittings: The keel, ribs are bonded to the hull, and epoxy resin is used for fastening. The cockpit slide rail system is fixed inside the hull through an aluminum alloy bracket, and fittings such as oarlocks and footrests are installed. The horizontal height error of the oarlocks on both sides is ≤1 mm;

[0065] (5) Surface treatment: The hull is polished, and an anti-ultraviolet varnish or personalized coating is sprayed;

[0066] (6) Performance test: Check whether the joints of the hull are water-permeable. Apply a pressure of 0.1 MPa and keep the pressure for 5 minutes without leakage. Ensure that the hull is symmetrical left and right to avoid yaw; check the weight balance of the hull. The weight difference of the whole boat is ≤0.5%.

[0067] The V-shaped multi-section flat-bottom rowing boat prepared by the above steps, after relevant tests, the drag coefficient is reduced to 28.955 N, the maximum speed is increased to 26.2 Km / h, it can reach 180 MPa, the impact resistance performance is improved, and the service life is significantly extended. The comparison table of the effects is shown in Table 2.

[0068] Table 2 Comparison of the structural parameters of different bottom structures and the V-shaped multi-section flat-bottom structure of the present invention

[0069]

[0070] Example 3:

[0071] The V-shaped multi-section flat-bottom rowing boat in this example is prepared through the following steps:

[0072] (1) Material selection: Materials are selected respectively according to the performance requirements of the inner layer 21, the intermediate layer 22, and the outer layer 23. Among them, the inner layer 21 uses lightweight PVC foam to reduce the hull weight, the intermediate layer 22 uses glass fiber-reinforced epoxy resin to improve the impact resistance of the hull, and the outer layer 23 uses high-modulus carbon fiber prepreg to improve the load-bearing strength of the hull and reduce the hull weight;

[0073] (2) Mold Preparation: According to the design drawings of the rowing boat, 3D printing alloy components are used to prepare the male mold and the female mold, and the surface is polished to mirror precision at the same time;

[0074] (3) Hull Molding: Layers of an inner layer 21 with a thickness of 30 mm, an intermediate layer 22 with a thickness of 10 mm, and an outer layer 23 with a thickness of 3 mm are laid layer by layer on the surface of the prepared male mold. Among them, the intermediate layer 22 and the outer layer 23 are laid alternately at 45° and 90°, and a vacuum bag press is used to remove air bubbles to improve the density; after laying, it is pre-cured at a low temperature of 80 °C for 8 h, and then finally cured at a high temperature of 130 °C for 6 h to obtain a hull blank. The curing temperature fluctuation should be ±1.0 °C to avoid uneven resin curing;

[0075] (4) Skeleton and Fitting Assembly: The keel, ribs are bonded to the hull, and epoxy resin is used for fastening. The cockpit slide rail system is fixed inside the hull through an aluminum alloy bracket, and oar racks and footrest fittings are installed. The horizontal height error of the oar racks on both sides is ≤1 mm;

[0076] (5) Surface Treatment: The hull is polished, and an anti-ultraviolet clear varnish or personalized coating is sprayed;

[0077] (6) Performance Testing: Check whether the joints of the hull are water-permeable. Apply a pressure of 0.1 MPa and hold the pressure for 5 minutes without leakage. Ensure that the hull is symmetric left and right to avoid yaw; check the weight balance of the hull. The weight difference of the whole boat is ≤0.5%.

[0078] The V-shaped multi-section flat-bottom rowing boat prepared through the above steps, after relevant tests, the drag coefficient is reduced to 28.965 N, the maximum speed is increased to 25.8 Km / h, and the strength of the hull is higher, reaching 350 MPa, improving the impact resistance performance, and the service life is significantly extended. The comparison table of the effects is shown in Table 3.

[0079] Table 3 Comparison of Structural Parameters between Different Bottom Structures and the V-shaped Multi-section Flat-bottom Structure of the Present Invention

[0080]

[0081] Finally, it should be noted that those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as it is within the scope of the essential spirit of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A V-shaped multi-section flat-bottomed racing boat, comprising a hull (1), characterized in that: The bottom of the hull (1) is provided with a multi-section flat bottom structure; the hull (1) comprises a front deck (2) and a stern deck (3); the front deck (2) is provided with a front cover corner (4); an oar rack (5) is provided above the front cover corner (4); the top of the oar rack (5) is connected to an oar rack head (6); the oar rack head (6) is connected to an oar bolt (7); a slide seat (8) is provided at the rear end of the oar rack (7); a flat plate (9) is provided at the rear end of the slide seat (8); the slide seat (8) and the flat plate (9) are connected to form a seat cabin; side rack slide rails (10) are provided on both sides of the front end of the stern deck (3); a footrest (11) is provided in the middle of the side rack slide rail (10).

2. The V-shaped multi-section flat-bottomed racing boat according to claim 1, characterized in that: The bottom of the hull (1) is a V-shaped multi-section flat-bottom structure, and both sides are provided with angular structures (12).

3. The V-shaped multi-section flat-bottomed racing boat according to claim 2, characterized in that: The angular structure (12) comprises a circular arc surface structure (121), a vertical inclined surface structure (122) and a horizontal inclined surface structure (123); the circular arc surface structure (121) is an inward circular arc; the vertical inclined surface structure (122) forms an angle less than 60° with the vertical direction; and the horizontal inclined surface structure (123) forms an angle less than 10° with the horizontal direction.

4. The V-shaped multi-section flat-bottomed racing boat according to claim 1, characterized in that: The hull (1) is composed of a three-layer structure of an inner layer (21), a middle layer (22) and an outer layer (23).

5. The V-shaped multi-section flat-bottomed racing boat according to claim 1, characterized in that: An anti-collision ball (13) is provided on the top of the front deck (2).

6. The V-shaped multi-section flat-bottomed racing boat according to claim 1, characterized in that: A stabilizing rudder (14) is provided at the bottom of the tail deck (3), and the stabilizing rudder (14) is a trapezoidal thin-surface structure.

7. A method for preparing the V-shaped multi-section flat-bottomed racing boat according to claim 1, comprising the following steps: (1) Material selection: Material selection is performed according to the performance requirements of the inner layer (21), the middle layer (22) and the outer layer (23), wherein the inner layer (21) is made of lightweight PVC foam or PMI foam core material to reduce the weight of the hull, the middle layer (22) is made of aramid fiber or glass fiber reinforced epoxy resin to improve the impact resistance of the hull, and the outer layer (23) is made of high modulus carbon fiber prepreg to improve the bearing strength of the hull and reduce the weight of the hull; (2) Mold preparation: According to the design drawings of the rowing boat, the aluminum alloy male and female molds are processed by CNC machine tools, and the surfaces are polished to mirror accuracy; (3) Hull forming: Laying an inner layer (21) of a specified thickness layer by layer on the surface of the prepared male mold. The middle layer (22) and the outer layer (23), wherein the middle layer (22) and the outer layer (23) are 0°, The paving is done alternately at 45° and 90°, and vacuum bag pressure is used to remove bubbles and improve density. After completion, a high temperature curing process is used to obtain the hull blank. The curing temperature fluctuation must be ≤±2℃ to avoid Uneven curing of the resin; (4) Assembly of frame and accessories: The keel, ribs and hull are glued together using epoxy resin or screw The cockpit slide rail system is fixed inside the hull through an aluminum alloy bracket. The horizontal height error of the paddle racks and pedal accessories on both sides is ≤1mm; (5) Surface treatment: grinding and polishing the hull, spraying with UV-proof varnish or personalized painting; (6) Performance test: Check whether there is water leakage at the joints of the hull, pressurize to 0.1 MPa, and maintain the pressure for 5 No leakage for 30 minutes, ensure the left and right symmetry of the boat body, avoid yaw; check the weight balance of the boat body, and the weight of the whole boat The quantity difference is ≤0.5%.

8. The method for preparing a high-efficiency novel room-temperature dechlorinating agent according to claim 7, characterized in that: In the step (2), a honeycomb sandwich structure or 3D printed alloy parts is used to prepare the male mold and the female mold, thereby improving the mold forming efficiency.

9. The method for preparing a high-efficiency novel room-temperature dechlorinating agent according to claim 7, characterized in that: In the step (3), the thickness of the inner layer (21) is 5 to 30 mm, the thickness of the middle layer (22) is 3 to 15 mm, and the thickness of the outer layer (23) is 0.5 to 5 mm. When laying the middle layer, a strain sensor is embedded to monitor the stress distribution of the hull in real time.

10. The method for preparing a novel high-efficiency room-temperature dechlorinating agent according to claim 7, characterized in that: The high temperature curing process in step (3) adopts a segmented curing process, firstly pre-curing at 80° C. for 2 to 8 hours, and then final curing at 130° C. for 2 to 6 hours.

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