Lateral-pushing flow guide plate and machining method thereof

Abstract

The invention relates to a ship manufacturing technology, and discloses a side thrust guide plate and a processing method thereof. The side pushing guide plate comprises a side pushing coaming, an inner ring guide plate and an outer ring guide plate. The inner side of the inner ring flow guide plate is connected with the edge of the side pushing coaming, a first preset included angle is formed between the inner ring flow guide plate and the horizontal plane, the inner side of the outer ring flow guide plate is connected with the outer side of the inner ring flow guide plate, a second preset included angle is formed between the outer ring flow guide plate and the horizontal plane, and the second preset included angle is larger than the first preset included angle. The machining method comprises the steps that a steel plate master batch is cut into the rectangular steel plate, the first arc-shaped plate to the sixth arc-shaped plate and the first panel to the fifth panel according to a preset cutting line; a rectangular steel plate is bent into a cylindrical side pushing coaming, the first arc-shaped plate to the sixth arc-shaped plate are connected end to end to form an annular inner ring flow guide plate, and the first panel to the fifth panel are connected to form a crescent outer ring flow guide plate. And the inner ring flow guide plate is connected with the side pushing coaming and the outer ring flow guide plate.

Description

Technical Field

[0001] The invention relates to shipbuilding technology, in particular to a side thrust deflector and a processing method thereof. Background Art

[0002] Currently, in a ship's omnidirectional waterjet propulsion system, the thruster deflector structure is crucial to the ship's maneuverability and hull structural stability. Traditional thruster deflectors have significant structural design deficiencies. They typically adopt a single-angle structure, making it difficult to achieve a smooth transition between the hull's outer plating and the thruster coaming. Due to the unreasonable design of the connection angles and shapes between the deflector, the thruster coaming, and the hull's outer plating, water flows through the deflector area, which easily generates eddies and turbulence. This not only reduces propulsion efficiency but also significantly impacts the hull structure, accelerating fatigue damage.

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

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

[0005] In order to solve the above technical problems, the present invention provides a side-pushing guide plate and a processing method thereof.

[0006] According to a first aspect of the present invention, a side-push guide plate is provided, which includes: a side-push enclosure plate, which is a vertical cylindrical plate; an inner ring guide plate, which is annular, the inner side of the inner ring guide plate is connected to the edge of the side-push enclosure plate, and the inner ring guide plate forms a first preset angle with the horizontal plane; and an outer ring guide plate, which is crescent-shaped, the inner side of the outer ring guide plate is connected to the outer side of the inner ring guide plate, and the outer ring guide plate forms a second preset angle with the horizontal plane, and the second preset angle is greater than the first preset angle.

[0007] In one embodiment, the inner ring guide plate includes a first curved plate, a second curved plate, a third curved plate, a fourth curved plate, a fifth curved plate and a sixth curved plate connected end to end in sequence; wherein, the length of the first curved plate is equal to the length of the fifth curved plate, the length of the second curved plate is equal to the length of the fourth curved plate, the length of the first curved plate is greater than the length of the second curved plate, and the third curved plate and the sixth curved plate 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 symmetrically arranged compared to the third panel, the second panel and the fourth panel are symmetrically arranged compared to the third panel, and the first panel and the third curved plate are correspondingly connected and have equal lengths, and the fifth panel and the sixth curved plate are correspondingly connected and have equal lengths.

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

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

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

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

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

[0014] In one embodiment, the surface roughness of the inner wall of the guide channel formed by the side thrust plate, the inner ring guide plate and the outer ring guide plate is not greater than Ra1.6 microns.

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

[0016] Compared with the prior art, the side thrust deflector and the processing method thereof according to the embodiment of the present invention have the following beneficial effects:

[0017] In this embodiment of the present invention, the inner ring of deflectors forms a first preset angle with the horizontal plane, while the outer ring of deflectors forms a second preset angle, which is greater than the first. This dual-layer arrangement at different angles allows the water to gradually change direction after exiting the thruster panels, achieving a streamlined transition with the hull plating. Compared to traditional deflectors with a single angle, this effectively reduces water flow turbulence and eddies, mitigates the impact of water on the hull structure, improves ship propulsion efficiency, and reduces energy loss.

[0018] The inner side of the annular inner ring guide plate is connected to the edge of the vertical cylindrical side thrust panel, and the inner side of the crescent-shaped outer ring guide plate is connected to the outer side of the inner ring guide plate. This structural design enables the side thrust guide plate to fit tightly with the side thrust panel and the hull outer plate 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axial schematic diagram of a side thrust deflector shown as an example in an embodiment of the present invention.

[0020] Figure 2 The figure is a top view schematically showing a side thrust deflector according to an embodiment of the present invention.

[0021] Figure 3 1 is a schematic cross-sectional view of a side thrust guide plate taken at AA, exemplarily shown in an embodiment of the present invention.

[0022] Figure 4 1 is a schematic cross-sectional view of a side thrust guide plate taken at position BB, exemplarily illustrating an embodiment of the present invention.

[0023] Figure 5 1 is a schematic cross-sectional view of a side thrust deflector at CC, exemplarily shown in an embodiment of the present invention.

[0024] Figure 6 It is a flow chart of a method for processing a side-pushing guide plate exemplarily shown in an embodiment of the present invention.

[0025] Reference numerals:

[0026] 1. Side thrust guide plate, 11. Side thrust panel, 12. Inner ring guide plate, 13. Outer ring guide plate, α, first preset angle, β, second preset angle, 111. Annular reinforcement rib, 121, first curved plate, 122, second curved plate, 123, third curved plate, 124, fourth curved plate, 125, fifth curved plate, 126, sixth curved plate, 131, first panel, 132, second panel, 133, third panel, 134, fourth panel, 135, fifth panel, 2. Hull outer plate, 3. Base panel. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish similar objects and are not used to describe specific structures. It should be understood that such terms are interchangeable where appropriate so that the embodiments of the present invention can be implemented in structures other than those shown or described. In addition, "including", "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 components or units explicitly listed, but may also include other components or units that are not explicitly listed but are inherent to these products or devices. The dotted lines in the drawings of the present invention are auxiliary lines made to facilitate understanding of the scheme of the present invention and are not used to limit the actual structure of the present invention.

[0029] Currently, in a ship's omnidirectional waterjet propulsion system, the thruster deflector structure is crucial to the ship's maneuverability and hull structural stability. Traditional thruster deflectors have significant structural design deficiencies. They typically adopt a single-angle structure, making it difficult to achieve a smooth transition between the hull's outer plating and the thruster coaming. Due to the unreasonable design of the connection angles and shapes between the deflector, the thruster coaming, and the hull's outer plating, water flows through the deflector area, which easily generates eddies and turbulence. This not only reduces propulsion efficiency but also significantly impacts the hull structure, accelerating fatigue damage.

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

[0031] Among them, the side thrust plate 11 is a vertical cylindrical shape, the inner ring guide plate 12 is annular, the inner side of the inner ring guide plate 12 is connected to the edge of the side thrust plate 11, and the inner ring guide plate 12 is at a first preset angle α with the horizontal plane; 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, and the outer ring guide plate 13 is at a second preset angle β with the horizontal plane, and the second preset angle β is greater than the first preset angle α.

[0032] like Figure 3 As shown, the inner ring guide plates 12 form a first preset angle α with the horizontal plane, while the outer ring guide plates 13 form a second preset angle β with the horizontal plane, which is greater than the first preset angle α. This dual-layer arrangement at different angles allows the water to gradually change direction after flowing out of the thrust coaming plate 11, achieving a streamlined transition with the hull plating 2. Compared with traditional guide plates with a single angle, this effectively reduces water flow turbulence and eddies, lessens 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 ring guide plate 12 is connected to the edge of the vertical cylindrical side thrust panel 11, and the inner side of the crescent-shaped outer ring guide plate 13 is connected to the outer side of the inner ring guide plate 12. This structural design enables the side thrust guide plate 1 to fit tightly with the side thrust panel 11 and the hull outer plate 2 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, if Figure 2 As shown, the inner ring guide plate 12 may include a first curved plate 121, a second curved plate 122, a third curved plate 123, a fourth curved plate 124, a fifth curved plate 125 and a sixth curved plate 126 connected end to end in sequence; wherein, the length of the first curved plate 121 is equal to the length of the fifth curved plate 125, the length of the second curved plate 122 is equal to the length of the fourth curved plate 124, the length of the first curved plate 121 is greater than the length of the second curved plate 122, and the third curved plate 123 and the sixth curved 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 plate 12 is split into six curved plates, with the third and sixth curved plates 123 and 126 located at the tangent point between the outer and inner guide plates 13 and 12. This design better aligns with the overall streamlined structure of the guide plates. This allows for more refined water flow guidance, reducing flow separation and eddies caused by sudden changes in the guide plate profile as the water flows from the thruster plate 11 through the inner guide plate 12 to the outer guide plate 13. This results in a smoother flow transition, further reducing the impact of the water on the hull structure and improving the efficiency of the ship's propulsion system.

[0036] The inner ring guide plate 12 is divided into multiple arc-shaped plate parts. Compared with the integrally formed inner ring guide plate 12, the size of a single part is smaller, which makes it easier to perform forming operations such as cutting and bending during the processing, reducing the processing difficulty and processing equipment requirements.

[0037] At the same time, the symmetrical setting of the length of each arc plate facilitates nesting and layout during the steel cutting stage, reducing steel waste, improving material utilization, and reducing manufacturing costs.

[0038] Furthermore, the segmented curved plates are easier to adjust and position during installation, effectively improving installation efficiency and accuracy. Although the multiple curved plates are flat, they can be connected with a slight tilt to form an annular inner ring guide plate 12 with an inclination relative to the horizontal plane at any position.

[0039] Based on this, in another embodiment of the present invention, reference 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, which are connected in sequence. The first panel 131 and the fifth panel 135 are symmetrically arranged relative to the third panel 133, and the second panel 132 and the fourth panel 134 are symmetrically arranged relative to the third panel 133. The first panel 131 and the third curved plate 123 are connected to each other and have the same length, and the fifth panel 135 and the sixth curved plate 126 are connected to each other and have the same length.

[0040] The symmetrical arrangement of the five panels precisely matches the six curved plates of the inner ring deflector 12. In particular, the corresponding connections and equal lengths of the first panel 131 and the third curved plate 123, as well as the fifth panel 135 and the sixth curved plate 126, ensure continuity of the contours of the inner and outer ring deflectors 13 at their tangent points. This allows the crescent-shaped outer ring deflector 13 to smoothly connect at its tip and achieve a preset inclination angle. This continuous inclination effectively reduces energy loss in the transition zone, minimizing eddies and turbulence, allowing the water to flow more smoothly from the thruster panel 11 to the hull plating 2, further improving the ship's propulsion efficiency.

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

[0042] The improvement of the angle based on the solution of the present invention does not require additional work, so the improved solution also falls within the scope of protection of the present invention.

[0043] In one embodiment, the inner ring deflector 12 is 20 mm thick, while the outer ring deflector 13 is 10.5 mm thick. As the primary load-bearing component, the inner ring deflector 12, with a thickness of 20 mm, ensures it can withstand the direct impact of the side thrust. Because the outer ring deflector 13 forms a tight connection with the lower hull, a thickness of 10.5 mm is used. This ensures sufficient support strength while reducing overall weight, in line with the principles of lightweight ship structure design.

[0044] In addition, in order to improve the structural strength, in one embodiment of the present invention, Figure 1 As shown, annular reinforcement ribs can be welded on the side thrust panel 11.

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

[0046] It should be understood that, in this disclosure, the "D" in DH36 steel plate represents the quality grade, indicating that the steel has passed the -20°C impact test; the "H" designates weldable high-strength structural steel; and the "36" indicates that the steel has a yield strength of no less than 355 MPa. Its Chinese name, "High-Strength Hull Structural Steel Grade D," is a type of marine steel plate characterized by high strength, good toughness, fatigue resistance, and excellent weldability.

[0047] DH36, a high-strength hull structural steel with a yield strength of ≥355MPa, meets the structural strength requirements of deflectors under high-pressure water impact. Furthermore, its alloying elements (such as manganese and nickel) impart excellent seawater corrosion resistance to the material, reducing its corrosion rate in marine environments by over 50% compared to ordinary carbon steel, extending the service life of deflectors to over 15 years. DH36 has a low carbon equivalent (≤0.42%) and a low hardness in the heat-affected zone (HAZ), significantly reducing the risk of weld cracking.

[0048] In addition, other materials may be used, depending on the actual project requirements and budget, and the present invention does not impose any specific limitations.

[0049] In one embodiment, the inner and outer ring deflectors 12 and 13 are welded together. The inner and outer ring deflectors 12 and 13 are welded together to the thrust plate 11, and the outer ring deflectors 13 are welded together to the hull plating 2. This fully welded structure eliminates the risk of loosening associated with bolted connections, forming a continuous, rigid structure. Furthermore, the welded structure eliminates the need for regular bolt preload checks, reducing routine maintenance workload.

[0050] Furthermore, in a preferred embodiment of the present invention, a transition fillet is provided at the junction of the inner and outer ring guide plates 12, 13. The radius of the transition fillet is 10-20 mm. This transition fillet ensures smooth water flow diversion at the junction of the inner and outer ring guide plates 13, avoiding the formation of a right-angle inflection point that could cause water flow separation. Furthermore, the stress concentration factor in the rounded transition area is low, effectively preventing fatigue cracks caused by stress concentration. The rounded corner provides more space for welding operations, facilitating torch angle adjustment and reducing defects such as lack of fusion and porosity.

[0051] In one embodiment, the inner wall surface roughness of the diversion channel formed by the side thrust panels 11, inner ring guide plates 12, and outer ring guide plates 13 is no greater than Ra 1.6 microns. A surface roughness of Ra ≤ 1.6 microns creates a mirror-like finish on the inner wall of the diversion channel, reducing the thickness of the water boundary layer and frictional resistance. A smooth surface reduces the likelihood of marine organisms attaching, and the area where fouling organisms can attach is reduced compared to a rough surface.

[0052] Correspondingly, as shown in the figure, the present invention also provides a method for processing a side thrust guide plate 1, which may include:

[0053] S101 , cutting a steel plate mother material into rectangular steel plates, first to sixth curved plates 121 to 126 , and first to fifth panels 131 to 135 according to preset dividing lines.

[0054] S102, bend the rectangular steel plate into a cylindrical side thrust plate 11, connect the first to sixth curved plates 121 to 126 end to end to form an annular inner ring guide plate 12, and connect the first to fifth panels 131 to 135 to form a crescent-shaped outer ring guide plate 13.

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

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

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

[0058] Secondly, during the forming and assembly process, the arc-shaped plate is connected to form an annular inner ring guide plate 12, and the panel is connected to form a crescent-shaped outer ring guide plate 13, and then the components are connected in order to make the structural stress evenly distributed and effectively avoid stress concentration; welding and other connection methods ensure that the components are tightly combined, thereby enhancing the overall structural strength and stability of the guide plate. At the same time, the modular design also facilitates subsequent 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 the inner ring guide plate 12 and the outer ring guide plate 13 are connected in S102, the processing method may also include: using a cold bending process to bend the first curved plate 121 to the sixth curved 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 guide channel can be mechanically polished to make its surface roughness meet the requirement of surface roughness not greater than Ra1.6 microns.

[0061] In another embodiment, the processing method may further include: processing a transition fillet at the connection between the inner ring guide plate 12 and the outer ring guide plate 13. Sandblasting and rust removal are performed on the entire side thrust guide plate 1, and an anti-corrosion coating is sprayed.

[0062] The present invention provides a side-thrust deflector 1 and a processing method thereof. The side-thrust deflector 1 realizes a streamlined transition between the hull outer plate 2 and the side-thrust panel 11 through a double-layer structural design of an annular inner ring deflector 12 and a crescent-shaped outer ring deflector 13, combined with differentiated angle settings of 13 degrees and 22 degrees; the block design of the inner ring six-arc plates and the outer ring five-panel plates optimizes the water flow guide path and improves processing adaptability; the differentiated plate thickness of 20 mm / 10.5 mm and the use of DH36 high-strength steel ensure a balance between structural strength and lightweight; the welding connection, transition fillet and low-roughness treatment of the inner wall further enhance the diversion 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 plates through the coordinated 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 the ship's omnidirectional waterjet propulsion system.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A side thrust deflector, characterized in that: The side thrust guide plate (1) comprises: A side push panel (11), wherein the side push panel (11) is a vertical cylindrical shape; An inner ring guide plate (12), the inner ring guide plate (12) is annular, the inner side of the inner ring guide plate (12) is connected to the edge of the side thrust plate (11), and the inner ring guide plate (12) forms a first preset angle (α) with the horizontal plane; An outer ring guide plate (13), 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 a horizontal plane, and the second preset angle (β) is greater than the first preset angle (α).

2. The side thrust deflector according to claim 1, characterized in that: The inner ring guide plate (12) comprises a first curved plate (121), a second curved plate (122), a third curved plate (123), a fourth curved plate (124), a fifth curved plate (125), and a sixth curved plate (126) which are sequentially connected end to end; The length of the first curved plate (121) is equal to the length of the fifth curved plate (125), the length of the second curved plate (122) is equal to the length of the fourth curved plate (124), the length of the first curved plate (121) is greater than the length of the second curved plate (122), and the third curved plate (123) and the sixth curved plate (126) are located at two tangent points between the outer ring guide plate (13) and the inner ring guide plate (12).

3. The side thrust deflector according to claim 2, characterized in that: The outer ring guide plate (13) comprises a first panel (131), a second panel (132), a third panel (133), a fourth panel (134) and a fifth panel (135) which are connected in sequence; The first panel (131) and the fifth panel (135) are symmetrically arranged relative to the third panel (133), the second panel (132) and the fourth panel (134) are symmetrically arranged relative to the third panel (133), and the first panel (131) and the third curved plate (123) are correspondingly connected and have the same length, and the fifth panel (135) and the sixth curved plate (126) are correspondingly connected and have the same length.

4. The side thrust deflector according to claim 1, characterized in that: The first preset angle (α) is 13 degrees, and the second preset angle (β) is 22 degrees.

5. The side thrust deflector according to claim 1, characterized in that: The thickness of the inner ring guide plate (12) is 20 mm, and the thickness of the outer ring guide plate (13) is 10.5 mm.

6. The side thrust deflector according to claim 1, characterized in that: The inner ring guide plate (12) and the outer ring guide plate (13) are both made of DH36 steel plates.

7. The side thrust deflector according to claim 1, characterized in that: The inner ring guide plate (12) is welded to the outer ring guide plate (13), the inner ring guide plate (12) is welded to the side thrust plate (11), and the outer ring guide plate (13) is welded to the hull outer plate (2).

8. The side thrust deflector according to claim 1, characterized in that: A transition fillet is provided at the connection between the inner ring guide plate (12) and the outer ring guide plate (13), and the radius of the transition fillet is 10-20 mm.

9. The side thrust deflector according to claim 1, characterized in that: The surface roughness of the inner wall of the guide channel formed by the side thrust plate (11), the inner ring guide plate (12) and the outer ring guide plate (13) is not greater than Ra1.6 microns.

10. A method for processing a side thrust guide plate, characterized in that: The processing method comprises: Cutting the steel plate masterbatch into rectangular steel plates, first to sixth curved plates (121) to (126) and first to fifth panels (131) to (135) according to preset dividing lines; The rectangular steel plate is bent into a cylindrical side thrust plate (11), the first arc plate (121) to the sixth arc plate (126) are connected end to end to form an annular 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); The inner edge of the inner ring guide plate (12) is connected to the side thrust plate (11), and the outer edge of the inner ring guide plate (12) is connected to the inner edge of the outer ring guide plate (13).

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