An equal cross-section rotor bow with gradually increasing center distance of mold core fit

Abstract

The utility model discloses a kind of equal-section rotor bow of mould core center distance gradual increase cooperation, belong to metal wire twisting equipment technical field.The rotor bow is bent along longitudinal direction, and its cross section is consistent in length direction;Arch guide groove is equipped in the middle of plate thickness direction, notch side is horizontal extension section, and extension section outside is connected with outer end surface through smooth transition zone of continuous curvature by beveling.The positioning hole column matched with mould core is set along length direction, and the distance of adjacent mould core is increasing from length center to both ends;Hard alloy lining is embedded in mould core lower part channel groove.Under the premise of not increasing the number of pieces, reduce high-speed rotation pneumatic resistance and noise, reduce energy consumption and improve wear resistance and life, suitable for steel cord, steel strand and other twisting equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of metal wire twisting equipment, specifically to a rotor bow with an equal cross-section and gradually increasing center distance of the die core. Technical Background

[0002] The stranding machine is a core piece of equipment in the production of metal products such as steel wire rope, steel strand, and steel cord. It uses the rotational motion of a rotor system to twist multiple steel wires together to form strands. The rotor bow, as a key load-bearing and guiding component of the stranding machine rotor, is typically a curved plate structure with guide grooves or guide wheels. It guides and constrains the steel wires during high-speed rotation, maintaining a constant payoff tension and playing a decisive role in ensuring the stability of the lay length and the quality of the strands.

[0003] Currently, traditional rotor bows mostly employ rectangular or simple streamlined cross-sectional designs, which have significant shortcomings. The aerodynamic shape of these rotor bows is suboptimal, resulting in substantial air resistance during high-speed rotation and a significant increase in energy consumption. Furthermore, the non-streamlined aerodynamic shape easily generates eddies and flutter, causing severe vibrations and high-decibel noise in the rotor bow and the entire twisting machine system. This not only affects twisting accuracy, causing uneven strand quality and even strand breakage, but also deteriorates the working environment. Traditional designs also suffer from abrupt transitions at cross-sectional shape changes, easily leading to stress concentration. Under alternating loads, this can trigger fatigue cracks, shortening the rotor bow's service life and affecting equipment operational safety.

[0004] To address these issues, this invention provides a novel rotor bow structure. By optimizing the cross-sectional shape, it effectively reduces aerodynamic resistance during high-speed rotation, suppresses vibration and noise, and improves stress distribution, thereby enhancing the energy efficiency, operational stability, and product twisting quality of the twisting machine. Utility Model Content

[0005] The technical problem to be solved by this utility model is: addressing the issues of excessive aerodynamic resistance and energy loss, significant vibration and noise, stress concentration at the cross-sectional edges, and insufficient wear resistance of existing rotor bows under high-speed rotation conditions, this utility model provides a low-resistance, noise-reducing, and energy-saving rotor bow with a gradually increasing center distance between the mold cores. Through a smooth cross-section design and an increasing arrangement of mold core hole spacing, and by setting an inner liner in the channel groove, the aerodynamic resistance and noise are reduced, stress concentration is alleviated, and wear life is improved.

[0006] To achieve the above objectives, the following technical solution is adopted: a rotor bow with a gradually increasing center distance between the mold cores, comprising a plate extending longitudinally with a consistent cross-section along its length and a mold core installed below the plate, a bow guide groove being provided in the middle of the plate in the thickness direction, the bottom of the bow guide groove being an arc, and horizontal extension sections being formed on both sides of the groove opening; the outer side of each horizontal extension section is connected to the outer end face of the plate through a bevel, and a smooth transition zone with continuous curvature or a rounded corner treatment is provided between the bevel and the outer end face.

[0007] Positioning holes that match the mold core are set along the length of the plate. With the length center as the plane of symmetry, the distance between adjacent holes increases from the length center to both ends, and the holes are symmetrical from left to right. The hole spacing increment ratio is in the range of 0.5 to 1.50. There are 10 to 14 sets of positioning holes.

[0008] The mold core is installed in the row of positioning holes, which has a symmetrical structure. The lower surface of the mold core fits the contour of the lower surface of the rotor bow; the upper surface contour of the mold core is a streamlined ellipse, and its width matches the total width of the rotor bow in the horizontal direction.

[0009] The inner liner is tightly fitted into the channel groove below the mold core. The shape of the inner liner is formed by equidistant offsets from the outline of the channel groove, and corresponds to the shape of the mold core mounting groove. The Rockwell hardness is HRA≥88.

[0010] The bow guide groove adopts a circular arc groove bottom structure with an opening width of 3 to 11 mm and a groove depth of 0.2 to 1.5 mm. In a preferred configuration, the outline of the lower channel groove of the bow is formed by a three-point circular arc or elliptical arc, which is determined by the two outer endpoints of the horizontal line segment at the bottom of the rotor bow cross section and a point located directly below the highest vertex of the elliptical curve.

[0011] The horizontal span of the bevel in the plate section coordinate system is 3-12 mm, and the vertical span is 0.10-0.8 mm. The angle between the bevel and the horizontal extension is 30°-65°. The smooth transition zone between the bevel and the outer end face has continuous normal curvature and a minimum equivalent fillet radius ≥0.1 mm. Or, when using fillet treatment, the minimum arc radius is ≥0.02 mm.

[0012] The nominal thickness of the plate is 1.20 to 2.0 mm; the plate is made of high-strength alloy material, selected from titanium alloy or manganese steel, and is heat-treated to obtain mechanical properties with a yield strength ≥900 MPa.

[0013] The overall length of the rotor bow is 500–1200 mm and the width is 14–30 mm to fit the flywheel disc of the twisting machine; positioning holes for assembly are provided at both ends.

[0014] This invention provides a uniform cross-section rotor bow with gradually increasing center-to-center spacing of the mold cores. Through the continuous curvature smooth design of the guide grooves, horizontal extension sections, bevels, and outer end faces, it reduces separation and eddies induced by abrupt changes in cross-section, thereby reducing aerodynamic drag and energy consumption. The symmetrical arrangement of the mold cores with increasing hole spacing allows for a gradual transition in the wire harness path and tension, which helps suppress vibration and noise. The lining placed within the channel grooves enhances wear resistance and extends the lifespan of critical components. Ensuring the strength grade of the plate and the smoothing treatment of the cross-section edges together alleviate stress concentration and improve fatigue resistance under alternating loads. This rotor bow is suitable for twisting equipment for steel cords and steel strands. Attached Figure Description

[0015] Figure 1 This is a top view of the overall assembly of the rotor bow of this utility model;

[0016] Figure 2 This is a schematic diagram of the rotor bow assembly cross-section structure of Embodiment 1 (rounded corner transition) of this utility model;

[0017] Figure 3 This is a schematic diagram of the rotor bow assembly cross-section structure of Embodiment 2 (elliptical transition) of this utility model;

[0018] Figure 4 yes Figure 3 A partial structural diagram of the area where the mold core is installed.

[0019] 1. Plate body; 2. Bow guide groove; 3. Horizontal extension section; 4. Bevel; 5. Outer end face; 6. Smooth transition zone; 8. Positioning hole two; 9. Mold core mounting groove; 10. Smooth transition zone; 11. Mold core; 12. Inner liner. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection. Other embodiments that can be obtained by those skilled in the art without inventive effort based on the concept of the present invention should be included within the scope of the claims of the present invention.

[0021] See Figures 1-4 As shown, this utility model provides a rotor bow with a gradually increasing center distance between the mold cores and a uniform cross-section, including a plate that extends longitudinally with a consistent cross-section in the length direction and a mold core installed below the plate. The plate has a bow guide groove in the middle of its thickness direction, the bottom of the bow guide groove is an arc, and horizontal extension sections are formed on both sides of the groove opening. The outer side of each horizontal extension section is connected to the outer end face of the plate through a bevel, and a smooth transition zone with continuous curvature or a rounded corner treatment is provided between the bevel and the outer end face. The middle side of the mold core has a steel cord channel groove, and an inner liner is tightly embedded in the steel cord channel groove.

[0022] Regarding the overall structure of the rotor bow:

[0023] See Figure 3 The rotor bow is a plate-shaped component that bends and extends along the longitudinal axis. Its overall length is 917 mm and its width is 24 mm. The above dimensions fall within the adaptation range of 500-1200 mm in length and 14-30 mm in width of this utility model, and the cross section maintains a constant cross section in the length direction.

[0024] The rotor bow has mounting holes at both ends for mounting it onto the flywheel of the twisting machine, which are consistent with the claims regarding the positioning of the two ends for assembly, and there is no limitation on the number of holes.

[0025] Twelve sets of positioning holes 8 are arranged along the middle of the length of the plate 1 for installing the mold core 11 to precisely limit the position of the steel cord. Each set of positioning holes 8 includes holes for fixing the mold core 11, meeting the installation requirements of the mold core 11 and the plate 1.

[0026] The 12 sets of positioning holes 8 are symmetrically and non-equidistantly distributed. The spacing is symmetrical about the length center and gradually increases from the middle of the rotor bow length direction to both ends. The increase ratio of the adjacent hole spacing is in the range of 0.5 to 1.50. They are symmetrically set on the left and right to achieve a gradual transition of tension and path and suppress vibration and noise.

[0027] Regarding the local structure at the mounting point of mold core 11: See [link / reference] Figure 1 and Figure 4 It shows the detailed structure of the mold core mounting position.

[0028] Positioning holes 8 are provided on both sides of the mold core mounting groove 9 to facilitate the positioning and fastening of the mold core 11 in the mounting groove.

[0029] The mold core mounting groove 9 is a rectangular groove, and in one embodiment its length is 10 mm and its width is 9 mm; this geometry is only an example value for ease of processing and assembly and does not constitute an additional limitation on the claims.

[0030] A smooth transition zone 10, for example, a transition section with a length of about 7 mm, can be set on both sides of the mold core mounting groove 9 to avoid stress concentration caused by local geometric abrupt changes; the specific length of the transition zone can be adjusted according to the actual structure and process.

[0031] Positioning holes 8 are used to install the mold core 11. The mold core 11 has a symmetrical structure, with its lower surface conforming to the contour of the lower surface of the rotor bow; the upper surface contour of the mold core 11 is a streamlined ellipse, and its lateral width matches the total width of the rotor bow in the horizontal direction. The lower part of the mold core 11 has a steel cord channel groove, the contour of which is formed by a three-point circular arc or elliptical arc determined by the two outer endpoints of the horizontal line segment 3 at the lower part of the rotor bow cross-section and a point located directly below the highest vertex of the elliptical curve. A liner 12 is tightly fitted inside the steel cord channel groove. The shape of the liner 12 is formed by offsetting the channel groove contour inwards at equal intervals, and corresponds to the shape of the mold core mounting groove 9. The liner 12 is made of hard alloy such as WC-Co or ceramic, with a Rockwell hardness HRA≥88, to improve wear resistance and guiding stability. The shape of the liner 12 is formed by offsetting the channel groove contour inwards by a certain distance.

[0032] Example 1

[0033] See Figure 2 This embodiment provides a rotor bow with equal cross-section, low resistance, noise reduction, and low energy consumption, with gradually increasing center distance between the mold cores.

[0034] The rotor bow is made of high-strength alloy material, selected from titanium alloy or manganese steel such as 65Mn, and is heat-treated to obtain mechanical properties with a yield strength ≥900 MPa.

[0035] The cross-section of the rotor bow is a constant cross-section.

[0036] The cross-sectional structure includes a plate 1 and a bow guide groove 2 located in the middle of the thickness direction of the plate 1.

[0037] The bottom of the guide groove 2 is an arc, which can be determined by the coordinates of three points: −4.5, 0, (4.5, 0) and (0, 0.6), so that the opening width of the guide groove 2 is 9.0 mm and the groove depth is 0.6 mm. The above parameters fall within the range of opening width 3 to 11 mm and groove depth 0.2 to 1.5 mm, respectively.

[0038] Horizontal extension sections 3 are provided on both sides of the opening of the bow guide groove 2.

[0039] The outer side of the horizontal extension section 3 is connected to the outer end face 5 of the plate 1 via the bevel 4.

[0040] The bevel 4 is an inclined surface with a horizontal span of 6.0 mm and a vertical span of 0.56 mm in the coordinate system of the plate 1 section, and forms an angle of about 45° with the horizontal extension 3; the above values ​​fall within the limited range of 3 to 12 mm, 0.10 to 0.8 mm and 30° to 65° respectively.

[0041] The bevel 4 and the outer end face 5 are connected by a smooth transition zone 6.

[0042] In this embodiment, the smooth transition zone 6 is a circular arc segment with continuous normal curvature, and its minimum equivalent fillet radius R is 0.20 mm, which satisfies ≥0.1 mm; it can also be treated with rounded corners and the minimum arc radius is ≥0.02 mm.

[0043] The nominal thickness of plate 1 is 1.70 mm, falling within the range of 1.20 to 2.0 mm.

[0044] Example 2

[0045] See Figure 3 The basic structure, materials, overall and local dimensions of this embodiment are exactly the same as those of Embodiment 1.

[0046] The difference between this embodiment and Embodiment 1 lies in the geometry of the smooth transition zone 6.

[0047] The smooth transition zone 6 is part of an elliptic curve with a major semi-axis a of 1.04 mm and a minor semi-axis b of 0.38 mm. The elliptic curve transitions tangentially to the bevel 4 and the outer end face 5 of the plate 1, forming a smooth and continuous profile.

[0048] This invention effectively reduces aerodynamic resistance and energy consumption during high-speed rotation, suppresses vibration and noise, and improves stress distribution by optimizing the cross-sectional shape and overall layout of the rotor bow, thereby significantly improving the energy utilization efficiency, working stability, and product twisting quality of the twisting machine.

Claims

1. A rotor bow with a gradually increasing center distance between the mold cores and a uniform cross-section, comprising a plate (1) extending longitudinally and having a consistent cross-section along its length, and a mold core (11) mounted below the plate (1), characterized in that: The plate (1) has a bow guide groove (2) in the middle of its thickness direction. The bottom of the bow guide groove (2) is an arc, and horizontal extension sections (3) are formed on both sides of the groove opening. The outer side of each horizontal extension section (3) is connected to the outer end face (5) of the plate (1) through a bevel (4), and a smooth transition zone (6) with continuous curvature or rounded corner treatment is provided between the bevel (4) and the outer end face (5). The mold core (11) has a steel cord channel groove on its middle side, and the steel cord channel groove is tightly fitted with an inner liner (12).

2. The rotor bow with gradually increasing center distance of the mold core according to claim 1, characterized in that: The smooth transition zone between the bevel (4) and the outer end face (5) is continuous in normal curvature, and the minimum equivalent fillet radius is ≥0.1 mm.

3. The rotor bow with gradually increasing center distance of the mold core according to claim 1, characterized in that: The bevel (4) and the outer end face (5) are rounded, with a minimum arc radius ≥ 0.02 mm.

4. A rotor bow with a gradually increasing center distance of the mold core according to any one of claims 1-3, characterized in that: It also includes positioning holes (8) that are set along the length of the plate (1) and match the mold core (11), with the hole spacing increasing from the middle to both ends; the channel groove below the mold core (11) is provided with an inner liner (12) that corresponds to the shape of the mold core mounting groove (9) and is offset inward at equal intervals.

5. A rotor bow with a gradually increasing center distance of the mold core according to any one of claims 1-3, characterized in that: The hole spacing of adjacent positioning holes (8) increases from the center line of the plate (1) to both ends at a rate of 0.5 to 1.

50.

6. A rotor bow with a gradually increasing center distance between mold cores according to claim 5, characterized in that: The horizontal span of the bevel (4) in the plate section coordinate system is 3 to 12 mm and the vertical span is 0.10 to 0.8 mm; the angle between the bevel (4) and the horizontal extension (3) is 30° to 65°.

7. A rotor bow with a gradually increasing center distance between mold cores according to claim 6, characterized in that: The opening width corresponding to the half-height of the bottom arc of the bow guide groove (2) is 3-11 mm, and the groove depth is 0.2-1.5 mm.

8. A rotor bow with a gradually increasing center distance of the mold core according to claim 7, characterized in that: The nominal thickness of the plate (1) is 1.20 to 2.0 mm.

9. A rotor bow with a gradually increasing center distance of the mold core according to claim 8, characterized in that: The overall length of the plate (1) is 500-1200 mm and the width is 14-30 mm, so as to be compatible with the flywheel disc of the twisting machine.

10. A rotor bow with a gradually increasing center distance of the mold core according to claim 9, characterized in that: A mold core (11) is installed on the positioning hole (8). The upper surface of the mold core (11) has an elliptical streamline shape, and the width of the elliptical streamline shape is adapted to the total width of the rotor bow in the horizontal direction. The inner liner (12) is formed by offsetting the outline of the steel cord channel groove inward by a certain distance.

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