A side push flow guide plate and a processing method thereof

Abstract

The present application relates to shipbuilding technology, disclose a side thrust fairing and its processing method. Side thrust fairing includes side thrust coaming, inner circle fairing and outer circle fairing. Side thrust coaming is vertical cylindrical, the inner side of inner circle fairing is connected with the edge of side thrust coaming, inner circle fairing is first preset angle with horizontal plane, the inner side of outer circle fairing is connected with the outer side of inner circle fairing, outer circle fairing is second preset angle with horizontal plane, second preset angle is greater than first preset angle. Processing method includes: according to the preset cutting line, the steel plate master batch is cut into rectangular steel plate, first arc plate to sixth arc plate and first panel to fifth panel. The rectangular steel plate is bent into cylindrical side thrust coaming, first arc plate to sixth arc plate is connected as annular inner circle fairing, first panel to fifth panel is connected as crescent outer circle fairing. Inner circle fairing is connected with side thrust coaming and outer circle fairing respectively.

Description

Technical Field

[0001] This invention relates to shipbuilding technology, and in particular to a side thrust guide plate and its processing method. Background Technology

[0002] Currently, in omnidirectional waterjet propulsion systems for ships, the side thruster guide structure is crucial for ship handling performance and hull structural stability. Traditional side thruster guides have significant structural design shortcomings, typically employing a single-angle structure that makes it difficult to achieve a smooth transition between the hull plating and the thruster bulkhead. Due to the unreasonable design of the connection angles and shapes between the guide plate and the thruster bulkhead, as well as the hull plating, eddies and turbulence are easily generated when water flows through the guide area. This not only reduces propulsion efficiency but also causes significant impact on the hull structure, accelerating fatigue damage.

[0003] Therefore, there is an urgent need to design a side-push guide plate that can achieve a smooth transition in order to optimize water flow guidance and reduce structural impact. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to achieve a smooth transition of the guide plate.

[0005] To address the aforementioned technical problems, this invention provides a side-push guide plate and its processing method.

[0006] In a first aspect, the present invention provides a side-push guide plate, comprising: a side-push enclosure, the side-push enclosure being a vertical cylinder; an inner ring guide plate, the inner ring guide plate being annular, the inner side of the inner ring guide plate being connected to the edge of the side-push enclosure, the inner ring guide plate forming a first preset angle with the horizontal plane; and an outer ring guide plate, the outer ring guide plate being crescent-shaped, the inner side of the outer ring guide plate being connected to the outer side of the inner ring guide plate, the outer ring guide plate forming a second preset angle with the horizontal plane, the second preset angle being greater than the first preset angle.

[0007] In one embodiment, the inner ring guide plate includes a first arc-shaped plate, a second arc-shaped plate, a third arc-shaped plate, a fourth arc-shaped plate, a fifth arc-shaped plate, and a sixth arc-shaped plate connected end to end in sequence; wherein, the length of the first arc-shaped plate is equal to the length of the fifth arc-shaped plate, the length of the second arc-shaped plate is equal to the length of the fourth arc-shaped plate, the length of the first arc-shaped plate is greater than the length of the second arc-shaped plate, and the third and sixth arc-shaped plates are located at two tangent points between the outer ring guide plate and the inner ring guide plate.

[0008] In one embodiment, the outer ring guide plate includes a first panel, a second panel, a third panel, a fourth panel, and a fifth panel connected in sequence; wherein the first panel and the fifth panel are arranged symmetrically with respect to the third panel, the second panel and the fourth panel are arranged symmetrically with respect to the third panel, and the first panel and the third arc-shaped plate are correspondingly connected and have the same length, and the fifth panel and the sixth arc-shaped plate are correspondingly connected and have the same length.

[0009] In one embodiment, the first preset included angle is 13 degrees and the second preset included angle is 22 degrees.

[0010] In one embodiment, the inner guide plate has a thickness of 20 mm and the outer guide plate has a thickness of 10.5 mm.

[0011] In one embodiment, both the inner and outer guide vanes are made of DH36 steel plate.

[0012] In one embodiment, the inner guide plate is welded to the outer guide plate, the inner guide plate is welded to the side thruster plate, and the outer guide plate is welded to the hull hull plate.

[0013] In one embodiment, a transition fillet is provided at the connection between the inner and outer guide vanes, and the radius of the transition fillet is 10-20 mm.

[0014] In one embodiment, the surface roughness of the inner wall of the flow channel formed by the side thrust plate, the inner ring guide plate and the outer ring guide plate is no greater than Ra1.6 micrometers.

[0015] In a second aspect, the present invention provides a method for processing a side-push guide plate. The method includes: cutting a steel plate master material into a rectangular steel plate, a first arc-shaped plate to a sixth arc-shaped plate, and a first panel to a fifth panel according to a preset dividing line; bending the rectangular steel plate into a cylindrical side-push enclosure; connecting the first arc-shaped plate to the sixth arc-shaped plate end to end to form an annular inner ring guide plate; connecting the first panel to the fifth panel to form a crescent-shaped outer ring guide plate; connecting the inner edge of the inner ring guide plate to the side-push enclosure; and connecting the outer edge of the inner ring guide plate to the inner edge of the outer ring guide plate.

[0016] Compared with the prior art, the side-push guide plate and its processing method of this invention have the following advantages:

[0017] In this embodiment of the invention, the inner guide vane forms a first preset angle with the horizontal plane, while the outer guide vane forms a second preset angle with the horizontal plane that is greater than the first preset angle. This double-layered design with different angles allows the water flow to gradually change direction after exiting the side thrusters, achieving a streamlined transition with the hull hull. Compared to traditional single-angle guide vanes, this design effectively reduces water flow turbulence and eddy current generation, lowers the impact of water flow on the hull structure, improves ship propulsion efficiency, and reduces energy loss.

[0018] The inner ring of the deflector plate is connected to the edge of the vertical cylindrical side thruster plate, and the inner ring of the crescent-shaped outer ring of the deflector plate is connected to the outer ring of the inner ring of the deflector plate. This structural design allows the side thruster deflector plate to fit tightly against the side thruster plate and the hull plate in a 360-degree direction, forming a continuous and smooth deflector surface, which can reduce the water flow resistance of propulsion in a 360-degree direction. Attached Figure Description

[0019] Figure 1 This is an axial side schematic diagram of a side-push guide plate, as exemplarily shown in an embodiment of the present invention.

[0020] Figure 2 This is a top view schematic diagram of a side-push guide plate exemplarily shown in an embodiment of the present invention.

[0021] Figure 3 This is a schematic cross-sectional view of the AA section of a side guide vane, as exemplarily shown in an embodiment of the present invention.

[0022] Figure 4 This is a schematic cross-sectional view of the BB section of a side guide vane, as exemplarily shown in an embodiment of the present invention.

[0023] Figure 5 This is a schematic cross-sectional view at the CC position of a side pusher plate, as exemplarily shown in an embodiment of the present invention.

[0024] Figure 6 This is a schematic flowchart illustrating a processing method for a side-push guide plate, as exemplarily shown in an embodiment of the present invention.

[0025] Figure label:

[0026] 1. Side thrust guide plate; 11. Side thrust cofferdam; 12. Inner ring guide plate; 13. Outer ring guide plate; α. First preset angle; β. Second preset angle; 111. Annular reinforcing rib; 121. First arc plate; 122. Second arc plate; 123. Third arc plate; 124. Fourth arc plate; 125. Fifth arc plate; 126. Sixth arc plate; 131. First panel; 132. Second panel; 133. Third panel; 134. Fourth panel; 135. Fifth panel; 2. Outer hull plate; 3. Base panel. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0028] In the description of this invention, it should be understood that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are intended to distinguish similar objects and are not used to describe a specific structure. It should be understood that such terms are interchangeable where appropriate so that embodiments of the invention can be implemented in structures other than those illustrated or described. Furthermore, "comprising," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a product or device comprising a series of components or units is not necessarily limited to those explicitly listed, but may also include other components or units not explicitly listed but inherent to these products or devices. The dashed lines in the accompanying drawings are auxiliary lines used to facilitate understanding of the invention and are not intended to limit the actual structure of the invention.

[0029] Currently, in omnidirectional waterjet propulsion systems for ships, the side thruster guide structure is crucial for ship handling performance and hull structural stability. Traditional side thruster guides have significant structural design shortcomings, typically employing a single-angle structure that makes it difficult to achieve a smooth transition between the hull plating and the thruster bulkhead. Due to the unreasonable design of the connection angles and shapes between the guide plate and the thruster bulkhead, as well as the hull plating, eddies and turbulence are easily generated when water flows through the guide area. This not only reduces propulsion efficiency but also causes significant impact on the hull structure, accelerating fatigue damage.

[0030] Based on this, such as Figure 1 As shown, a side-push guide plate 1 of a preferred embodiment of the present invention may include: a side-push enclosure 11, an inner guide plate 12, and an outer guide plate 13.

[0031] The side thrust plate 11 is a vertical cylinder, the inner guide plate 12 is annular, the inner side of the inner guide plate 12 is connected to the edge of the side thrust plate 11, and the inner guide plate 12 forms a first preset angle α with the horizontal plane. The outer guide plate 13 is crescent-shaped, the inner side of the outer guide plate 13 is connected to the outer side of the inner guide plate 12, and the outer guide plate 13 forms a second preset angle β with the horizontal plane. The second preset angle β is greater than the first preset angle α.

[0032] like Figure 3 As shown, the inner guide vane 12 forms a first preset angle α with the horizontal plane, while the outer guide vane 13 forms a second preset angle β with the horizontal plane, which is greater than the first preset angle α. This double-layered design with different angles allows the water flow to gradually change direction after exiting the side thruster 11, achieving a streamlined transition with the hull hull 2. Compared to traditional single-angle guide vanes, this design effectively reduces water flow turbulence and eddy current generation, lowers the impact of water flow on the hull structure, improves ship propulsion efficiency, and reduces energy loss.

[0033] The inner side of the annular inner guide plate 12 is connected to the edge of the vertical cylindrical side thruster plate 11, and the inner side of the crescent-shaped outer guide plate 13 is connected to the outer side of the inner guide plate 12. This structural design allows the side thruster guide plate 1 to fit tightly against the side thruster plate 11 and the outer plate 2 of the hull in a 360-degree direction, forming a continuous and smooth guide surface, which can reduce the water flow resistance of propulsion in a 360-degree direction.

[0034] In one embodiment, such as Figure 2 As shown, the inner ring guide plate 12 may include a first arc-shaped plate 121, a second arc-shaped plate 122, a third arc-shaped plate 123, a fourth arc-shaped plate 124, a fifth arc-shaped plate 125, and a sixth arc-shaped plate 126 connected end to end in sequence; wherein, the length of the first arc-shaped plate 121 is equal to the length of the fifth arc-shaped plate 125, the length of the second arc-shaped plate 122 is equal to the length of the fourth arc-shaped plate 124, the length of the first arc-shaped plate 121 is greater than the length of the second arc-shaped plate 122, and the third arc-shaped plate 123 and the sixth arc-shaped plate 126 are located at two tangent points between the outer ring guide plate 13 and the inner ring guide plate 12.

[0035] The inner guide vane 12 is divided into six arc-shaped plates, with the third arc-shaped plate 123 and the sixth arc-shaped plate 126 located at the tangent point between the outer guide vane 13 and the inner guide vane 12. This design allows for a better fit to the overall streamlined structure of the guide vane. It enables more precise guidance of the water flow, reducing water separation and vortex phenomena caused by abrupt changes in the guide vane profile as the water flows from the side thruster 11 through the inner guide vane 12 to the outer guide vane 13. This results in a smoother water flow transition, further reducing the impact of the water flow on the hull structure and improving the efficiency of the ship's propulsion system.

[0036] The inner ring guide plate 12 is disassembled into multiple arc-shaped plate parts. Compared with the integrally formed inner ring guide plate 12, the size of each part is smaller, making it easier to perform cutting, bending and other forming operations during processing, thus reducing the processing difficulty and processing equipment requirements.

[0037] Meanwhile, the symmetrical arrangement of the lengths of each arc plate facilitates nesting and layout during the steel cutting stage, reducing steel waste, improving material utilization, and lowering manufacturing costs.

[0038] Furthermore, the segmented arc-shaped plates are easier to adjust and position during installation, effectively improving installation efficiency and accuracy. Although the multiple arc-shaped plates are flat, they can be slightly tilted during connection to form an annular inner guide plate 12 that has an angle relative to the horizontal plane at any position.

[0039] Based on this, in another embodiment of the present invention, reference is made to... Figure 2The outer ring guide plate 13 may include a first panel 131, a second panel 132, a third panel 133, a fourth panel 134, and a fifth panel 135 connected in sequence. Among them, the first panel 131 and the fifth panel 135 are arranged symmetrically with respect to the third panel 133, the second panel 132 and the fourth panel 134 are arranged symmetrically with respect to the third panel 133, and the first panel 131 is correspondingly connected to the third arc plate 123 and has the same length, and the fifth panel 135 is correspondingly connected to the sixth arc plate 126 and has the same length.

[0040] The symmetrical arrangement of the five panels precisely matches the six arc-shaped plates of the inner guide vane 12. In particular, the corresponding connections between the first panel 131 and the third arc-shaped plate 123, and between the fifth panel 135 and the sixth arc-shaped plate 126, with equal lengths, ensure the continuity of the profile of the inner and outer guide vanes 13 at the tangent points. This allows the crescent-shaped outer guide vane 13 to form a smooth connection at its tip and achieve the preset angle. This continuous angle variation effectively reduces energy loss in the transition zone, minimizes the generation of eddies and turbulence, and allows water to flow more smoothly from the side thrusters 11 to the hull hull plating 2, further improving the ship's propulsion efficiency.

[0041] Preferably, in one embodiment of the present invention, the first preset included angle α can be 13 degrees, and the second preset included angle β can be 22 degrees. The angle difference between 13 degrees and 22 degrees forms a gradual flow guiding channel, which effectively disperses the impact force of the water flow and reduces stress concentration at the hull connection parts.

[0042] The improvement in angle based on the solution of this invention requires no additional effort, therefore the improved solution also falls within the protection scope of this invention.

[0043] In one embodiment, the inner guide vane 12 has a thickness of 20 mm, and the outer guide vane 13 has a thickness of 10.5 mm. The inner guide vane 12, as the main load-bearing component, has a thickness of 20 mm to ensure it can withstand the direct impact of the lateral thrust flow. The outer guide vane 13, since it can form a tight connection with the underside of the hull, has a thickness of 10.5 mm, which reduces the overall weight while meeting the required support strength, conforming to the principle of lightweight ship structure design.

[0044] Furthermore, in order to improve structural strength, in one embodiment of the present invention, such as Figure 1 As shown, annular reinforcing ribs can be welded onto the side push plate 11.

[0045] In one embodiment, both the inner guide vane 12 and the outer guide vane 13 are made of DH36 steel plate.

[0046] It is understood that in this invention, "D" in DH36 steel plate represents a quality grade, indicating that the steel has passed an impact test at -20℃; "H" indicates that it is a weldable high-strength structural steel; and "36" indicates that the yield strength of the steel is not less than 355MPa. Its Chinese name is High-Strength Ship Structure Steel Grade D, a type of marine steel plate, possessing high strength, good toughness, fatigue resistance, and excellent weldability.

[0047] DH36, as a high-strength structural steel for ship hulls, has a yield strength ≥355MPa, meeting the structural strength requirements of the deflector plate under high-pressure water flow impact. Simultaneously, its alloying elements (such as manganese and nickel) endow the material with excellent seawater corrosion resistance, reducing the corrosion rate in marine environments by more than 50% compared to ordinary carbon steel, extending the service life of the deflector plate to over 15 years. DH36 has a low carbon equivalent (≤0.42%), resulting in lower hardness in the weld heat-affected zone, significantly reducing the risk of weld cracking.

[0048] Other materials may also be used, depending on the actual project needs and budget. This invention does not impose any specific restrictions.

[0049] In one embodiment, the inner guide vane 12 is welded to the outer guide vane 13, the inner guide vane 12 is welded to the side thruster 11, and the outer guide vane 13 is welded to the hull hull plating 2. This fully welded structure eliminates the risk of loosening that may exist with bolted connections, making the guide vane system a continuous, rigid whole. Furthermore, the welded structure eliminates the need for periodic bolt preload checks, reducing daily maintenance workload.

[0050] Furthermore, in a preferred embodiment of the present invention, a transition fillet is provided at the connection between the inner ring guide plate 12 and the outer ring guide plate 13, with a radius of 10-20 mm. The transition fillet allows the water flow to smoothly change direction at the connection between the inner and outer ring guide plates 13, avoiding water flow separation caused by right-angle inflection points. Additionally, the stress concentration coefficient in the fillet transition area is low, effectively preventing fatigue cracks caused by stress concentration. The fillet area provides more space for welding operations, facilitating the adjustment of the welding torch angle and reducing defects such as incomplete fusion and porosity.

[0051] In one embodiment, the surface roughness of the inner wall of the flow channel formed by the side thrust plate 11, the inner ring guide plate 12, and the outer ring guide plate 13 is no greater than Ra 1.6 micrometers. A surface roughness Ra ≤ 1.6 micrometers makes the inner wall of the flow channel nearly mirror-like, reducing the thickness of the water boundary layer and decreasing frictional resistance. The smooth surface reduces the likelihood of marine organism attachment, and the area for fouling organism attachment is smaller compared to a rough surface.

[0052] Accordingly, as shown in the figure, the present invention also provides a method for processing the side-push guide plate 1, the processing method including:

[0053] S101. Cut the steel plate master material into rectangular steel plates, first arc plate 121 to sixth arc plate 126 and first panel 131 to fifth panel 135 according to the preset dividing line.

[0054] S102. The rectangular steel plate is bent into a cylindrical side push plate 11, the first arc plate 121 to the sixth arc plate 126 are connected end to end to form an annular inner guide plate 12, and the first panel 131 to the fifth panel 135 are connected to form a crescent-shaped outer guide plate 13.

[0055] S103. Connect the inner edge of the inner guide plate 12 to the side thrust plate 11, and connect the outer edge of the inner guide plate 12 to the inner edge of the outer guide plate 13.

[0056] The processing method of this invention adopts a modular manufacturing concept, which significantly improves processing efficiency and product quality through step-by-step cutting, shaping and assembly.

[0057] First, the steel plate master material is precisely cut into basic components such as rectangular steel plates, curved plates, and panels according to the preset dividing lines. This simplifies the processing flow, reduces the reliance on complex processing equipment and special processes, significantly shortens the processing cycle, and reduces costs. Each component is formed independently before being connected, which not only ensures dimensional accuracy and avoids error accumulation, but also allows for flexible adjustment of position and angle during installation, improving assembly efficiency.

[0058] Secondly, during the molding and assembly process, the arc-shaped plates are connected to form an inner ring guide plate 12, and the panel is connected to form a crescent-shaped outer ring guide plate 13. Then, the components are connected in an orderly manner to ensure uniform stress distribution and effectively avoid stress concentration. Welding and other connection methods ensure that the components are tightly combined, which enhances the overall structural strength and stability of the guide plate. At the same time, the modular design facilitates later maintenance and replacement, extends the service life of the guide plate, and improves the versatility and adaptability of the product.

[0059] Furthermore, in one embodiment, before connecting the inner ring guide plate 12 and the outer ring guide plate 13 in S102, the processing method may further include: using a cold bending process to bend and shape the first arc plate 121 to the sixth arc plate 126 and the first panel 131 to the fifth panel 135 respectively, so that they meet the angle parameters required by the first preset angle α and the second preset angle β.

[0060] In addition, the inner wall of the flow channel can be mechanically polished to make its surface roughness meet the requirement of no more than Ra1.6 micrometers.

[0061] In another embodiment, the processing method may further include: machining a transition fillet at the connection between the inner ring guide plate 12 and the outer ring guide plate 13; sandblasting the entire side thrust guide plate 1 to remove rust; and spraying an anti-corrosion coating.

[0062] This invention provides a side thrust guide plate 1 and its processing method. The side thrust guide plate 1, through a double-layer structure design of an annular inner guide plate 12 and a crescent-shaped outer guide plate 13, combined with differentiated angle settings of 13 degrees and 22 degrees, achieves a streamlined transition between the hull plate 2 and the side thrust coaming 11. The segmented design of the inner six-arc plate and the outer five-panel plate optimizes the water flow guidance path and improves processing adaptability. The differentiated plate thickness of 20 mm / 10.5 mm and the application of DH36 high-strength steel ensure a balance between structural strength and lightweight. Welded connections, transition fillets, and low roughness treatment of the inner wall further enhance the flow guidance efficiency and structural reliability.

[0063] In summary, the embodiments of the present invention achieve significant breakthroughs in reducing water flow impact, improving propulsion efficiency, and extending service life of the guide vane through the synergistic optimization of fluid mechanics and structural mechanics. At the same time, the modular processing technology reduces manufacturing costs, providing an efficient, reliable, and economical guide solution for omnidirectional waterjet propulsion systems of ships.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A side-push guide vane, characterized in that, The side-push guide plate (1) includes: Side push panel (11), wherein the side push panel (11) is a vertical cylinder; The inner ring guide plate (12) is annular, and the inner side of the inner ring guide plate (12) is connected to the edge of the side push plate (11). The inner ring guide plate (12) forms a first preset angle (α) with the horizontal plane. The inner ring guide plate (12) includes a first arc plate (121), a second arc plate (122), a third arc plate (123), a fourth arc plate (124), a fifth arc plate (125), and a sixth arc plate (126) connected end to end in sequence. The outer ring guide plate (13) is crescent-shaped. The inner side of the outer ring guide plate (13) is connected to the outer side of the inner ring guide plate (12). The outer ring guide plate (13) forms a second preset angle (β) with the horizontal plane. The second preset angle (β) is greater than the first preset angle (α). The outer ring guide plate (13) includes a first panel (131), a second panel (132), a third panel (133), a fourth panel (134), and a fifth panel (135) connected in sequence. Wherein, the length of the first arc plate (121) is equal to the length of the fifth arc plate (125), the length of the second arc plate (122) is equal to the length of the fourth arc plate (124), the length of the first arc plate (121) is greater than the length of the second arc plate (122), the third arc plate (123) and the sixth arc plate (126) are located at two tangent points between the outer ring guide plate (13) and the inner ring guide plate (12); the first panel (131) and the fifth panel (135) are compared with the third panel (135). 3) Symmetrical arrangement: the second panel (132) and the fourth panel (134) are symmetrically arranged compared to the third panel (133), and the first panel (131) and the third arc plate (123) are correspondingly connected and have the same length. The fifth panel (135) and the sixth arc plate (126) are correspondingly connected and have the same length. The inner ring guide plate (12) and the outer ring guide plate (13) are welded together. The inner ring guide plate (12) and the side thrust plate (11) are welded together. The outer ring guide plate (13) and the outer hull plate (2) are welded together.

2. The side-push guide plate according to claim 1, characterized in that, The first preset included angle (α) is 13 degrees, and the second preset included angle (β) is 22 degrees.

3. The side-push guide plate according to claim 1, characterized in that, The inner guide plate (12) has a thickness of 20 mm, and the outer guide plate (13) has a thickness of 10.5 mm.

4. The side-push guide plate according to claim 1, characterized in that, The inner guide plate (12) and the outer guide plate (13) are both made of DH36 steel plate.

5. The side-push guide plate according to claim 1, characterized in that, The connection between the inner ring guide plate (12) and the outer ring guide plate (13) is provided with a transition fillet, the radius of which is 10-20 mm.

6. The side-push guide plate according to claim 1, characterized in that, The surface roughness of the inner wall of the flow channel formed by the side push plate (11), the inner ring guide plate (12) and the outer ring guide plate (13) is no greater than Ra1.6 micrometers.

7. A method for processing a side-push guide plate, characterized in that, The processing method is applied to the side thrust guide plate as described in any one of claims 1-6, and the processing method includes: The steel plate master material is cut into rectangular steel plates, first arc plate (121) to sixth arc plate (126) and first panel (131) to fifth panel (135) according to the preset dividing line. The rectangular steel plate is bent into a cylindrical side push plate (11), the first arc plate (121) to the sixth arc plate (126) are connected end to end to form an inner ring guide plate (12), and the first panel (131) to the fifth panel (135) are connected to form a crescent-shaped outer ring guide plate (13). Connect the inner edge of the inner ring guide plate (12) to the side push plate (11), and connect the outer edge of the inner ring guide plate (12) to the inner edge of the outer ring guide plate (13).

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