Spring coiling device for coiling compression spring with large wire diameter and large pitch
By employing a design in the spring coiling machine where multiple coiling wheels are tangent to the spring steel wire, combined with variable diameter and variable pitch components, the problems of coiling wheel chipping and wire scratches are solved, thereby improving the durability of the coiling wheels and the surface quality of the spring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AN QING XIE DE ER QI CHE LING BU JIAN YOU XIAN GONG SI
- Filing Date
- 2025-07-10
- Publication Date
- 2026-05-26
AI Technical Summary
When existing spring coiling machines wind large-diameter, large-pitch compression springs, the arc-shaped groove of the winding wheel is prone to chipping due to excessive stress concentration, resulting in structural damage and scratches on the surface of the steel wire, affecting the quality of the spring.
The design employs multiple winding wheels tangential to the spring steel wire, combined with variable diameter and pitch components. Through the synergistic effect of the winding wheels and pitch cutter, stress concentration at the edge of the winding wheels is avoided, and the bending direction of the steel wire is controlled by limiting posts and annular grooves to ensure the integrity of the steel wire surface.
This effectively prevents chipping of the winding wheel, increases the service life of the device, improves the surface quality of the compression spring, and ensures the integrity of the steel wire and the performance of the spring.
Smart Images
Figure CN224273092U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of spring manufacturing technology, specifically to a coiling spring device for winding large-diameter, large-pitch compression springs. Background Technology
[0002] Large-diameter, large-pitch compression springs are typically located between the clutch pressure plate and the clutch cover. They are evenly distributed along the circumference of the pressure plate and fixed to the clutch cover with bolts, acting directly on the back of the pressure plate. The engagement of this compression spring with other components in the clutch is usually driven by the pressure plate. The clamping force of the compression spring is transmitted through the pressure plate to the friction plates, ensuring a tight fit between them and the flywheel.
[0003] like Figure 1 As shown, the existing device for winding this compression spring is a spring coiling machine. The existing spring coiling machine 6 includes a straightening mechanism 61 for eliminating wire bending, a feeding mechanism 62 for conveying straight wire, a diameter-changing mechanism 63 for adjusting the outer diameter of the compression spring, a pitch-changing mechanism 64 for adjusting the spring pitch, and a cutting mechanism 65 for cutting the wire. (Combined with...) Figure 2 As shown, the diameter-changing mechanism 63 includes two push rods 631 and a diameter-changing cam 632 that drives the push rods 631 to move relative to the steel wire. The top of the push rod 631 that contacts the steel wire forms an arc-shaped groove 633, which guides the steel wire to bend and deform to gradually form a compression spring. The pitch-changing mechanism 64 includes an existing pitch cutter 641 and a pitch-changing cam or linear transmission linkage structure that drives the existing pitch cutter 641 to move relative to the bent steel wire. The existing pitch cutter 641 forms an inclined working surface to guide the bent steel wire to bend along the axis, thereby forming the pitch of the compression spring.
[0004] In the process of processing large-diameter, large-pitch compression springs using an existing coil spring machine, the inventors of this application discovered that the wire diameter of the compression spring is directly proportional to its strength. As the wire diameter increases, its bending strength increases. When the arc-shaped groove at the top of the push rod guides the deformation of the large-diameter steel wire, the large-diameter steel wire exerts a huge lateral force on the two ends of the arc-shaped groove, causing the local stress at the two ends of the arc-shaped groove to far exceed the yield strength of the push rod. This results in chipping at the top of the push rod, requiring the push rod to be replaced, which affects the processing of the steel wire. At the same time, the sharp edge formed by the chipping will scratch the surface of the steel wire, reducing the surface quality of the compression spring. Utility Model Content
[0005] This utility model addresses the problem of structural component damage during the winding of large-diameter, large-pitch compression springs using existing spring coiling machines. It provides a spring coiling device for winding large-diameter, large-pitch compression springs, with the specific technical solution as follows:
[0006] A coiling spring device for winding large-diameter, large-pitch compression springs includes: an auxiliary assembly for straightening, conveying, and cutting large-diameter spring steel wires; a diameter-changing assembly including at least two winding wheels whose radial sides are tangent to the spring steel wires, the winding wheels being capable of helically bending the spring steel wires to form a plurality of helical wires, the axes L of the helical wires all coinciding and increasing in number along the axis L; and a pitch-changing assembly capable of bending each helical wire along the axis L to increase the distance between adjacent helical wires.
[0007] Furthermore, the auxiliary component includes a limiting post whose axis is parallel to the axis L of the spiral steel wire, and the radial side of the limiting post is tangent to the concave side of the spirally bent spring steel wire; the radial side of the winding wheel forms an annular groove for placing the spring steel wire, at least two annular grooves are tangent to the convex side of the spring steel wire, and the tangency points of the annular grooves with at least two spring steel wires and the tangency points of the limiting post with the spring steel wire can form a circle O with a defined diameter and center, and circle O is the cross-section of the spiral steel wire.
[0008] Preferably, the diameter-changing assembly further includes a movable rod that is movably or detachably connected to the winding wheel, the movable rod being able to push the winding wheel and the annular groove closer to or away from the limiting post to change the diameter of the circle O.
[0009] Preferably, the pitch-changing assembly includes a pitch cutter connected to a helical steel wire and a telescopic rod that drives the pitch cutter to move; the surface of the pitch cutter tangent to the helical steel wire forms an inclined surface M; the movement trajectory of the pitch cutter driven by the telescopic rod is parallel to the axis L, and the angle between the inclined surface M and the straight direction of the pitch cutter away from the winding wheel is an acute angle. When the telescopic rod drives the pitch cutter away from the winding wheel, the inclined surface M guides the helical steel wire to bend along the axis L, and the bending direction is the direction of the pitch cutter away from the winding wheel, so as to increase the spacing between adjacent helical steel wires.
[0010] Furthermore, the pitch-changing assembly also includes an L-shaped support with its short and long sides perpendicular to each other. The long side of the L-shaped support is connected to the telescopic rod, and the short side of the L-shaped support is connected to the pitch cutter. The long side is aligned with the length direction of the pitch cutter, and the short side is perpendicular to the length direction of the pitch cutter. The distance between the pitch cutter and the long side is adjustable to adjust the distance between the inclined surface M and the axis L.
[0011] Preferably, the auxiliary components include: a straightening member for straightening spring steel wire, a feeding member for conveying spring steel wire, and a cutting member for cutting spring steel wire.
[0012] As can be seen from the above technical solution, this utility model has the following beneficial effects:
[0013] This invention sets multiple winding wheels that are tangent to the spring steel wire, so that the spring steel wire can only be pressured through the tangent point. This avoids the winding wheels from chipping due to excessive stress concentration at the edge, which would cause structural damage. At the same time, it also avoids the chipping location from causing scratches on the surface of the spring steel wire. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of an existing spring coiling machine embodiment.
[0015] Figure 2 for Figure 1 Enlarged view of the structure at point A in the image;
[0016] Figure 3 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0017] Figure 4 for Figure 3 Enlarged view of the structure at point B in the image;
[0018] Figure 5 A schematic diagram of a compression spring machined using a pitch cutter.
[0019] In the diagram: 1. Variable diameter assembly; 11. Winding wheel; 12. Annular groove; 13. Moving rod; 2. Variable pitch assembly; 21. Pitch knife; 22. L-shaped support; 23. Telescopic rod; 24. Inclined surface M; 3. Auxiliary assembly; 31. Straightening component; 32. Feeding component; 33. Cutting component; 34. Limiting post; 4. Spring steel wire; 5. Compression spring; 6. Existing spring coiling machine; 61. Straightening mechanism; 62. Feeding mechanism; 63. Variable diameter mechanism; 631. Top rod; 632. Variable diameter cam; 633. Arc groove; 64. Variable pitch mechanism; 641. Existing pitch knife; 65. Cutting mechanism. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0022] like Figure 3 and Figure 4 As shown, this embodiment is a coiling spring device for winding a large-diameter, large-pitch compression spring 5, including: an auxiliary component 3 for straightening, conveying, and cutting large-diameter spring steel wire 4; a diameter changing component 1, which includes at least two winding wheels 11 whose radial sides are tangent to the spring steel wire 4, the winding wheels 11 being able to helically bend the spring steel wire 4 to form a plurality of helical wires, the axes L of the helical wires all coinciding and increasing in number along the axis L; and a pitch changing component 2, which is able to bend each helical wire along the axis L to increase the distance between adjacent helical wires.
[0023] Specifically, auxiliary component 3 conveys the spring steel wire 4 wound on the drum to the position for straightening treatment. The straightening treatment restores it to a straight state and contacts the diameter reducing component 1. The straightening treatment of spring steel wire 4 refers to applying multi-directional pressure to it by mechanical means, thereby repeatedly plastically deforming it to destroy the original internal stress. The key is to use the "overcorrection" strategy, that is, to apply a reverse deformation amount exceeding the actual curvature to offset the springback effect, thereby restoring it to a straight state.
[0024] Secondly, the starting end of the spring steel wire 4 requires the operator to use the auxiliary components and the diameter-changing assembly 1 to bend and deform it, so that it bends and deforms relative to the winding wheel 11. In this embodiment, two winding wheels 11 are included. The radial side of the winding wheel 11 is tangent to the bent spring steel wire 4, and the tangent points of the winding wheel 11 and the bent spring steel wire 4 do not coincide. The auxiliary component 3 pushes the straight spring steel wire 4 towards the winding wheel 11, and then the straight spring steel wire 4 bends and deforms under the pressure of the first winding wheel 11 to form a bent spring steel wire 4 with a large curvature. The bent spring steel wire 4 is bent and deformed under the pressure of the second winding wheel 11 to further reduce the curvature of the bent spring steel wire 4. During this process, both winding wheels 11 guide the bent spring steel wire 4 to bend in a direction away from itself. The bending deformation in both directions causes the spring steel wire 4 to form several spiral wires, and the direction of the increase in the number of spiral wires is away from the winding wheel 11. Secondly, during the formation of the spiral wires, the axes of each spiral wire coincide to form the axis L, and the length direction of the axis L is consistent with the direction away from the winding wheel 11.
[0025] During this process, the radial side of the winding wheel 11 is tangent to the large-diameter spring steel wire 4 at only one point. The position of this tangent point can be set in the middle of the radial side of the winding wheel 11 to avoid the spring steel wire 4 from exerting excessive pressure on it, thereby avoiding the winding wheel 11 from chipping, improving the service life of the winding wheel 11, and preventing it from scratching the surface of the spring steel wire 4.
[0026] Secondly, the pitch-changing assembly 2 is set on the periphery of the spiral steel wire. When the straight spring steel wire 4 moves continuously toward the winding wheel 11, the winding wheel 11 continuously bends and deforms it to form a spiral steel wire. The spiral steel wire continuously rotates around the axis L to increase its number of turns. At the same time, the pitch-changing assembly 2 applies a force parallel to the axis L to the adjacent spiral steel wires, so that the two move away from each other along the direction of the axis L during rotation. The axial distance between the center lines of the two is the pitch of the large-diameter, large-pitch compression spring 5.
[0027] Furthermore, the auxiliary component 3 includes a limiting post 34 whose axis is parallel to the axis L of the spiral steel wire. The radial side of the limiting post 34 is tangent to the concave side of the spirally bent spring steel wire 4. The radial side of the winding wheel 11 forms an annular groove 12 for placing the spring steel wire 4. At least two annular grooves 12 are tangent to the convex side of the spring steel wire 4. The tangent points of the annular grooves 12 and the spring steel wire 4, as well as the tangent points of the limiting post 34 and the spring steel wire 4, can form a circle O with a defined diameter and center. The circle O is the cross-section of the spiral steel wire.
[0028] Specifically, the length direction of the limiting post 34 is consistent with the straight direction of the axis L, and its outer surface has an arc-shaped surface. This arc-shaped surface is tangent to the concave side of the spirally bent spring steel wire 4, and applies a force away from the axis L to it, so as to prevent the spiral steel wire from continuing to bend in the direction of the axis L during rotation and bending deformation, thereby preventing the curvature of the bent spring steel wire 4 from continuing to decrease, and thus preventing the diameter of the spiral steel wire from continuing to decrease.
[0029] Secondly, this embodiment includes two winding wheels 11, and annular grooves 12 are formed on the radial sides of both winding wheels 11. The bottom of the annular grooves 12 is tangent to the outer side of the bent spring steel wire 4, and the annular grooves 12 are inclined in the direction away from the pitch component 2, so that they can apply an inward bending force to the bent spring steel wire 4 and bend along the axis L in the direction away from the pitch component 2 to form a spiral wire.
[0030] Secondly, the tangent points of the two annular grooves 12 and the bent spring steel wire 4, as well as the tangent points of the limiting post 34 and the bent spring steel wire 4, can determine the diameter and center of the circle, i.e., circle O. Circle O is the cross-section of the spiral wire, which in turn is the cross-section of the large-diameter, large-pitch compression spring 5, and thus its cross-sectional shape is determined.
[0031] Furthermore, the variable diameter assembly 1 also includes a movable rod 13 that is movably or detachably connected to the winding wheel 11. The movable rod 13 is capable of pushing the winding wheel 11 and the annular groove 12 closer to or away from the limiting post 34 to change the diameter of the circle O.
[0032] Specifically, one end of the moving rod 13 is bolted to the winding wheel 11, and the other end is connected to the deformable cam transmission mechanism, gear and rack transmission mechanism, or cylinder transmission mechanism, so that it can move in a straight line. Its movement trajectory passes through the bottom of the annular groove 12 and the tangent point of the bent spring steel wire 4. Thus, when the two moving rods 13 move the same distance at the same time and approach the axis L, the diameter of the circle O decreases. When the two moving rods 13 move the same distance at the same time and move away from the axis L, the diameter of the circle O increases, thereby controlling the diameter of the large-diameter, large-pitch compression spring 5.
[0033] like Figure 5 As shown, the pitch-changing assembly 2 includes a pitch cutter 21 connected to a spiral steel wire and a telescopic rod 23 that drives the pitch cutter 21 to move. The surface of the pitch cutter 21 that is tangent to the spiral steel wire forms an inclined surface M24. The movement trajectory of the pitch cutter 21 driven by the telescopic rod 23 is parallel to the axis L. The angle between the inclined surface M24 and the straight direction of the pitch cutter 21 away from the winding wheel 11 is an acute angle. When the telescopic rod 23 drives the pitch cutter 21 away from the winding wheel 11, the inclined surface M24 guides the spiral steel wire to bend along the axis L. The bending direction is the direction of the pitch cutter 21 away from the winding wheel 11, so as to increase the spacing between adjacent spiral steel wires.
[0034] Specifically, Figure 5 The side view shows the process of the pitch cutter 21 machining adjacent spiral steel wires. The movement trajectory of the telescopic rod 23 is parallel to the axis L. Driven by the gear and rack transmission mechanism or the cylinder transmission mechanism, it can drive the pitch cutter 21 to move. Secondly, the side of the pitch cutter 21 away from the telescopic rod 23 is tangent to the spiral steel wire. This side is the inclined surface M24. The inclined surface M24 is inclined to the right, away from the annular groove 12, with an included angle of 70°. During the process of the telescopic rod 23 driving the pitch cutter 21 to move to the right to machine the spiral steel wire, the inclined surface M24 continuously applies an upward force to the spiral steel wire, causing it to bend and deform to the right. Since the spiral steel wire has a large diameter and a large elastic modulus, the inclined surface M24 applies a component force pointing towards the axis L, causing it to elastically deform to one side. When the pitch cutter 21 finishes machining, a large-diameter, large-pitch compression spring 5 is formed. When it separates from the spiral steel wire, the compression spring 5 resets itself to form a hollow cylinder, which meets the production requirements.
[0035] Furthermore, the pitch-changing assembly 2 also includes an L-shaped support 22 with its short and long sides perpendicular to each other. The long side of the L-shaped support 22 is connected to the telescopic rod 23, and the short side of the L-shaped support 22 is connected to the pitch cutter 21. The long side is aligned with the length direction of the pitch cutter 21, and the short side is perpendicular to the length direction of the pitch cutter 21. The distance between the pitch cutter 21 and the long side is adjustable to adjust the distance between the inclined surface M24 and the axis L.
[0036] Specifically, the long side of the L-shaped support 22 is longer than the short side. Its long side is fixedly connected to the telescopic rod 23 by bolts and fixing blocks. Its long side and short side are integrally formed or welded together. Its short side is fixedly connected to the pitch cutter 21 by bolts, so that the pitch cutter 21 can be disassembled at any time for easy replacement and maintenance. As the pitch cutter 21 gradually moves away from the winding wheel 11, the inclined surface M24 always applies a component force pointing towards the axis L to the spiral steel wire, which in turn applies a bending moment to the compression spring 5, causing the compression spring 5 to gradually deviate from the axis L, and causing the inclined surface M24 to gradually deviate from the compression spring 5. The pitch cutter 21 is perpendicular to the short side, and the short side can shorten the distance between the pitch cutter 21 and the axis L. While limiting the total length of the compression spring 5, the inclined surface M24 is always in contact with the spiral steel wire, preventing it from detaching from the spiral steel wire during processing and causing a production accident.
[0037] Secondly, the position between the pitch cutter 21 and the short side is adjustable, thereby adjusting the distance between the pitch cutter 21 and the axis L, and then adjusting the position of the pitch cutter 21 according to the diameter of the compression spring 5. The specific adjustment details vary depending on the experience of those skilled in the art, the bending strength of the compression spring 5, and the on-site production conditions.
[0038] Furthermore, the auxiliary component 3 includes: a straightening member 31 for straightening the spring steel wire 4, a feeding member 32 for conveying the spring steel wire 4, and a cutting member 33 for cutting the spring steel wire 4.
[0039] Specifically, as can be seen from the conventional structure in the field of spring coiling machines, the straightening component 31 applies pressure at different angles to the side of the spring steel wire 4 through rollers arranged with cross axes, so as to form a straight spring steel wire 4. The feeding component 32 squeezes the spring steel wire 4 through the rolling rollers, and then moves towards the diameter changing component 1 and the pitch changing component 2 under the drive of friction. The cutting component 33 cuts the spiral steel wire through the cutter that can move relative to the axis L of the spiral steel wire, thereby forming a large-diameter, large-pitch compression spring 5 with the same length, pitch, and number of turns.
[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
[0041] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.
Claims
1. A coiling device for winding a large pitch compression spring with a large wire diameter, characterized in that include: Auxiliary components (3) for straightening, conveying and cutting large-diameter spring steel wires (4); A diameter-changing assembly (1) includes at least two winding wheels (11) whose radial sides are tangent to the spring steel wire (4). The winding wheels (11) are capable of helically bending the spring steel wire (4) to form a plurality of helical wires, the axes L of which coincide and the number increases along the axis L. The pitch component (2) is capable of bending each of the spiral wires along axis L to increase the distance between adjacent spiral wires.
2. The coil spring device of claim 1, wherein: The auxiliary component (3) includes a limiting post (34) whose axis is parallel to the axis L of the spiral steel wire, and the radial side of the limiting post (34) is tangent to the concave side of the spirally bent spring steel wire (4). The radial side of the winding wheel (11) forms an annular groove (12) for placing the spring steel wire (4). At least two of the annular grooves (12) are tangent to the outer convex side of the spring steel wire (4). The tangent points of the annular grooves (12) and at least two of the spring steel wires (4) and the tangent points of the limiting post (34) and the spring steel wire (4) can form a circle O with a defined diameter and center. The circle O is the cross-section of the spiral wire.
3. The coil spring device of claim 2, wherein: The variable diameter assembly (1) further includes a movable rod (13) that is movably or detachably connected to the winding wheel (11). The movable rod (13) is capable of pushing the winding wheel (11) and the annular groove (12) closer to or away from the limiting post (34) to change the diameter of the circle O.
4. The coil spring device according to claim 1, characterized in that: The pitch assembly (2) includes a pitch cutter (21) connected to the spiral steel wire and a telescopic rod (23) that drives the pitch cutter (21) to move. The pitch blade (21) forms an inclined surface M (24) with the surface tangent to the spiral steel wire; The telescopic rod (23) drives the pitch cutter (21) to move along a path parallel to the axis L. The angle between the inclined surface M (24) and the straight direction of the pitch cutter (21) away from the winding wheel (11) is an acute angle. When the telescopic rod (23) drives the pitch cutter (21) away from the winding wheel (11), the inclined surface M (24) guides the spiral wire to bend along the axis L. The bending direction is the direction of the pitch cutter (21) away from the winding wheel (11), so as to increase the spacing between adjacent spiral wires.
5. The coil spring device according to claim 4, characterized in that: The variable pitch assembly (2) further includes an L-shaped support (22) with its short side and long side perpendicular to each other. The long side of the L-shaped support (22) is connected to the telescopic rod (23), and the short side of the L-shaped support (22) is connected to the pitch cutter (21). The long side is in the same direction as the length of the pitch cutter (21), and the short side is perpendicular to the length of the pitch cutter (21). The distance between the pitch cutter (21) and the long side is adjustable to adjust the distance between the inclined surface M (24) and the axis L.
6. The coil spring device according to claim 1, characterized in that: The auxiliary component (3) includes: a straightening member (31) for straightening the spring steel wire (4), a feeding member (32) for conveying the spring steel wire (4), and a cutting member (33) for cutting the spring steel wire (4).