A rotor bow of a near double-elliptical stream-lined cross-section

Abstract

The utility model discloses a rotor bow of near double elliptical streamline section belongs to high -speed rotating machinery component technical field, and rotor bow is equal cross section board shape bending member, and its cross section is by upper horizontal line section, upper transition class ellipse streamline, lower transition class ellipse streamline, bow guide groove and lower horizontal line section smooth connection constitution, forms the near double elliptical streamline profile of continuous curvature. The guide ring is provided on the rotor bow, and the lower surface of the guide ring is attached with the lower surface of the rotor bow, and the upper surface is the class ellipse streamline type, the inner lining is inlayed in the lower groove of the guide ring to form the wear -resisting passage. Through the combination design of near double elliptical section and streamline guide ring, the aerodynamic shape is optimized significantly, the air resistance, vibration and noise when high -speed rotating are reduced effectively, and the energy efficiency is promoted and realizes the energy -conserving and consumption -reducing.

Description

Technical Field

[0001] This utility model relates to the field of high-speed rotating mechanical components, specifically to a rotor bow with a near-double elliptical streamlined cross section. Technical Background

[0002] The twisting machine is a core piece of equipment in the production of metal products such as steel wire rope and steel cord. It achieves the twisting of multiple steel wires through the high-speed rotation of the rotor system. As a key component of the rotor, the rotor bow plays an important role in guiding and constraining the steel wires and maintaining the tension of the unwinding. Its performance directly affects the twisting quality, equipment energy consumption, and operational stability.

[0003] Widely used rotor bows mostly employ a constant cross-section design, typically rectangular or streamlined with simple rounded corners. This traditional design has significant drawbacks: its aerodynamic shape is not fully optimized, resulting in high wind resistance at high speeds, easily generating air vortices and flutter, leading to additional energy loss and causing equipment vibration and noise. The abrupt transitions at cross-sectional shape changes easily cause stress concentration, making them prone to fatigue cracks under long-term alternating loads, affecting the rotor bow's service life and operational safety.

[0004] To address the aforementioned issues, this invention aims to provide a novel rotor bow structure with a near-double elliptical streamlined cross-section. By innovatively designing the cross-sectional profile and matching it with a streamlined guide ring, it reduces wind resistance and improves stress distribution from the aerodynamic shape source, thereby achieving efficient, stable, and low-consumption twisting operations. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of existing rotor bows, such as poor aerodynamic shape, high energy consumption, and excessive vibration and noise, and to provide a low wind resistance rotor bow with a near double elliptical streamlined cross section.

[0006] To achieve the above objectives, the following technical solution is adopted.

[0007] A rotor bow with a near-double-elliptical streamlined cross-section includes a rotor bow, which is a plate-like component with a uniform cross-section that extends and bends along the longitudinal axis. Its cross-section is symmetrical about its central plane. From top to bottom, the cross-section is smoothly connected by an upper horizontal segment, an upper transitional elliptical streamline, a lower transitional elliptical streamline, a bow guide groove, and a lower horizontal segment, forming a near-double-elliptical streamlined profile with continuous curvature. The bottom of the bow guide groove is arc-shaped and smoothly transitions with the adjacent profile with continuous curvature, thereby reducing local stress concentration and optimizing the aerodynamic shape while maintaining the guiding function.

[0008] The rotor bow has positioning holes at both ends for assembly with the flywheel disc of the twisting machine; several sets of guide ring positioning holes are arranged symmetrically with respect to the length center along the length of the rotor bow, and the hole spacing gradually increases from the middle to both ends to achieve a gradual transition of steel cord tension.

[0009] A guide ring is installed on the guide ring positioning hole. The guide ring has a symmetrical structure; its lower surface conforms to the contour of the lower surface of the rotor bow at the installation position, and its upper surface is a near-elliptical streamline shape that smoothly transitions to the cross-section of the rotor bow. A groove is provided at the lower part of the guide ring, and an inner liner is tightly embedded in the groove to form a wear-resistant channel; the outer contour of the liner and the inner surface of the guide ring are equidistantly offset inward from the outer contour to form a semi-circular annular channel. A guide ring mounting groove and a smooth transition area can be provided at the guide ring mounting location to improve assembly stability.

[0010] In a preferred embodiment, the bottom of the bow guide groove can be defined by a circular arc profile determined by three points; correspondingly, the arc profile of the lower groove of the guide ring can also be defined by a circular arc determined by three points, so as to ensure the curvature continuity and dimensional fit with the near-double elliptical composite section.

[0011] Compared with the prior art, this utility model has the following beneficial effects: through the synergistic design of near-double elliptical composite cross section and streamlined guide ring, a smooth aerodynamic shape with continuous curvature is achieved under the condition of equal cross section, which can effectively guide airflow, delay separation, and reduce air resistance and eddies during high-speed rotation; combined with the symmetrical incremental arrangement of guide ring positioning holes and the wear-resistant guide structure with inner lining of groove, vibration and noise can be suppressed, and the guiding stability and wear life can be improved, thereby achieving a comprehensive effect of low wind resistance, low energy consumption and high reliability. Attached Figure Description

[0012] Figure 1 This is a top view of the overall structure of the rotor bow of this utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0014] Figure 3 This is a schematic diagram of the cross-sectional structure of the rotor bow of this utility model;

[0015] Figure 4 This is a schematic diagram of the cross-sectional structure of the guide ring of this utility model;

[0016] 1. Rotor bow; 2. Bow guide groove; 3. Lower horizontal line segment; 4. Lower transition elliptical streamline; 5. Upper transition elliptical streamline; 6. Upper horizontal line segment; 7. Positioning hole; 8. Guide ring positioning hole; 9. Guide ring; 10. Liner. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. It should be understood that the embodiments described are for illustration and not limitation of the present invention; all equivalent substitutions and modifications made without departing from the claims shall fall within the protection scope of the present invention.

[0018] See Figure 1 A rotor bow with a near-double elliptical streamlined cross-section includes a rotor bow 1, which is a plate-like component with a uniform cross-section that bends and extends along the longitudinal axis. Positioning holes 7 are machined at both ends of the rotor bow for assembly and positioning with the flywheel disc of a twisting machine. Along the middle of the rotor bow's length direction, several sets of guide ring positioning holes 8 are symmetrically distributed for installing guide rings 9; the spacing between each set of holes is symmetrically and non-linearly increasing along the length direction with the length center as the plane of symmetry, gradually increasing from the middle to both ends, to match the gradual transition of the path and tension of the steel cord during high-speed twisting.

[0019] See Figure 2 The core of this invention lies in the fact that the cross-section of the rotor bow is a uniform cross-section and a near-double elliptical streamline. This cross-section is symmetrical about the central plane and is composed of the following geometric elements connected smoothly with continuous curvature from top to bottom: upper horizontal line segment 6, upper transition elliptical streamline 5, lower transition elliptical streamline 4, bow guide groove 2, and lower horizontal line segment 3. Among them, the guide groove 2 is located in the middle of the plate thickness direction, and its bottom is an arc-shaped profile, using a circular arc determined by three points, and is tangent to / continuously transitioning with the adjacent transition curves. All adjacent curves or line segments are connected by tangent or continuous curvature to ensure the smooth continuity of the cross-sectional profile and aerodynamic integration.

[0020] See Figure 3 The guide ring 9 has a symmetrical structure. The upper surface of the guide ring has a streamlined elliptical profile. The streamline can be determined by the geometric constraints of the highest vertex and two symmetrical side points on the central symmetry plane, and it smoothly transitions with the near-double-elliptical composite section of the rotor bow. Its lower surface fits the surface profile of the rotor bow at the installation position to ensure stable assembly. The lower part of the guide ring 9 is provided with a groove. The groove profile is arc-shaped and defined by a three-point arc: the two outer endpoints of the horizontal line segment 3 at the lower part of the rotor bow section and a point located directly below the highest vertex of the elliptical streamline on the upper surface of the guide ring 9 and at a predetermined vertical distance from the lower horizontal line segment (3) form three points, thereby ensuring the curvature continuity between the groove and the guide profile. The inner liner 10 is tightly embedded in the groove. The inner liner 10 is made of tungsten-chromium-cobalt alloy. The outer surface profile of the inner liner 10 and the inner surface of the guide ring 9 are offset inward from the outer profile to form a semi-circular annular channel, providing a highly wear-resistant passage path for the steel cord and improving the guiding stability.

[0021] See Figure 4The guide ring 9 is mounted on the rotor bow through the guide ring positioning hole 8. To reduce the impact of geometric abrupt changes in this area on local stress, a guide ring mounting groove and a smooth transition zone can be provided at the mounting position of the guide ring 9, so that the upper and lower surfaces of the guide ring 9 and the rotor bow 1 remain in close contact and smooth in the assembled state. The streamlined shape of the guide ring 9 combined with the near-double-elliptical streamlined cross-section of the rotor bow can further optimize the local aerodynamic shape and reduce air resistance and vortices during high-speed rotation.

[0022] This invention achieves excellent aerodynamic integration while maintaining its guiding function through the coordinated design of the near-double elliptical composite cross section, smooth continuous curvature, streamlined guide ring 9, and inner liner 10. It can effectively guide airflow, delay separation, reduce air resistance and eddies during high-speed rotation, and suppress vibration and noise. This results in a comprehensive technical effect of low wind resistance, low energy consumption, and high reliability, making it particularly suitable for high-speed twisting machine applications.

Claims

1. A rotor bow with a near-double elliptical streamlined cross section, comprising a rotor bow (1), characterized in that: The rotor bow (1) is a plate-shaped component with a uniform cross section that bends and extends along the longitudinal axis. The cross section of the rotor bow (1) is symmetrical about the central plane and is composed of an upper horizontal line segment (6), an upper transition elliptical streamline (5), a lower transition elliptical streamline (4), a bow guide groove (2), and a lower horizontal line segment (3) that are connected smoothly in sequence to form a near-double elliptical streamline profile with continuous curvature. The bottom of the bow guide groove is arc-shaped and transitions with the adjacent profile in a continuous curvature manner. The rotor bow (1) is provided with a guide ring (9), the lower surface of the guide ring (9) is in contact with the lower surface of the rotor bow (1), and the upper surface (11) of the guide ring is an elliptical streamline shape; the lower part of the guide ring (9) is provided with a groove, and the groove is fitted with an inner liner (10) to form a wear-resistant channel.

2. The rotor bow with a near-double elliptical streamlined cross-section according to claim 1, characterized in that: The bow guide groove (2) is a circular arc determined by three points, including the two inner endpoints of the lower horizontal line segment (3) and a point located on the central symmetry plane at a certain distance from the lower horizontal line segment (3).

3. The rotor bow with a near-double elliptical streamlined cross-section according to claim 2, characterized in that: The rotor bow (1) has positioning holes (7) at both ends for mounting onto the flywheel disc of the twisting machine.

4. The rotor bow with a near-double elliptical streamlined cross-section according to claim 3, characterized in that: Several sets of guide ring positioning holes (8) are set along the length direction of the rotor bow (1), which are arranged symmetrically with respect to the length center, and the hole spacing gradually increases from the middle to both ends.

5. The rotor bow with a near-double elliptical streamlined cross-section according to claim 4, characterized in that: The guide ring (9) has a symmetrical structure. Its lower surface fits the contour of the upper / lower surface of the rotor bow (1) at the installation position. Its upper surface is an elliptical streamline shape and smoothly transitions with the cross section of the rotor bow (1). The installation part of the guide ring (9) can be provided with a guide ring (9) installation groove and a smooth transition area.

6. The rotor bow with a near-double elliptical streamlined cross-section according to claim 5, characterized in that: The groove at the bottom of the guide ring (9) has an arc-shaped profile and corresponds to the bow guide groove. The inner liner (10) is tightly embedded in the groove. The outer shape of the inner liner (10) and the inner surface of the guide ring (9) are offset inward from the outer contour to form a semi-circular wear-resistant channel.

7. The rotor bow with a near-double elliptical streamlined cross-section according to any one of claims 3-6, characterized in that: The outline of the groove of the guide ring (9) is defined by a circular arc determined by three points, including the two outer endpoints of the lower horizontal line segment (3) of the rotor bow (1) section and a point located directly below the highest vertex of the elliptical streamline on the upper surface of the guide ring (9) and a predetermined vertical distance from the lower horizontal line segment (3).

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