Wire straightening machine

Abstract

The application provides a metal wire straightening machine, and belongs to the technical field of wire straightening, which comprises a pay-off reel, a buffer mechanism, a straightening mechanism and a rewinding mechanism arranged in sequence, wherein the buffer mechanism comprises a plurality of buffer wheels, a linkage limiting assembly and a control assembly. The metal wire straightening machine controls the initial buffer wheel to continuously move to increase the buffer capacity as the wire tension decreases, and in this process, the system triggers the linkage limiting assembly step by step to realize the step-by-step expansion of the buffer capacity. Not only can the buffer demand of the wire tension fluctuation range be fully met, but also the deformation path formed by the middle to both sides is transmitted in the process of expanding the buffer capacity, so that the deformation amount of the wire presents a distribution characteristic of first increasing and then decreasing, thereby the deformation amount of the wire before entering the straightening area is at a low level, and the stability of the straightening quality and the reliability of the system work are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire straightening, in particular to a metal wire straightening machine. BACKGROUND

[0002] In the production of bolt batch cold upsetting forming, the metal wire in coils is usually used as raw material. In order to improve the performance of the wire, the wire in coils needs to be heated and spheroidized before entering the cold upsetting workshop. However, during the spheroidizing process, the wire will inevitably deform to some extent due to heating and cooling, resulting in bending, twisting or irregular stress. If it is directly used for subsequent cold upsetting, it is easy to cause problems such as poor product size precision, mold wear and even cracking. Therefore, the wire needs to be straightened before spheroidizing and cold upsetting to make the wire uniform, straight and stable in tension.

[0003] At present, the straightening treatment of metal wire coils is mainly through a straightening system composed of a unwinding mechanism, a straightening mechanism and a rewinding structure. In this system, the wire is drawn out from the unwinding mechanism, straightened by the straightening mechanism, and then wound by the rewinding structure. The straightening effect of the straightening mechanism (usually a multi-roll straightening machine) is highly dependent on the stability of the wire tension at its inlet. If the wire tension fluctuates too much, it will directly affect the quality of straightening. In order to stabilize the wire tension, the existing technology usually sets a buffer mechanism directly between the straightening mechanism and the unwinding mechanism to absorb the change of the wire tension and improve the stability of the straightening process. However, in the aforementioned straightening system, the unwinding process of the unwinding mechanism depends on the tension generated during the straightening process of the straightening mechanism. As the amount of wire in the unwinding mechanism decreases, the load of the unwinding mechanism decreases, causing the tension of the wire to decrease, and the overall tension fluctuation range is large. Therefore, the buffer mechanism usually expands its buffer capacity by increasing the stroke. However, as the buffer capacity increases, the degree of deformation of the wire in the buffer mechanism also increases, which will directly interfere with the quality of subsequent straightening and the stability of the straightening process. For this reason, some buffer mechanisms use an auxiliary active control system to monitor the wire tension in real time through a tension sensor and dynamically adjust the buffer force or unwinding speed using a PLC, servo motor and other actuators. This scheme can achieve good results, but the system structure is complex, resulting in a significant increase in equipment manufacturing and maintenance costs, making it difficult to popularize in production scenarios that focus on cost-effectiveness. SUMMARY

[0004] The application provides a metal wire straightening machine, which comprises a pay-off reel, a buffer mechanism, a straightening mechanism and a rewinding mechanism arranged in sequence, the buffer mechanism comprises a plurality of buffer wheels, a linkage limiting assembly and a control assembly, the buffer wheels are arranged in sequence along a wire conveying path, when one of the buffer wheels, which is designated as an initial buffer wheel, moves to a first predetermined stroke and continues to move in response to the wire tension, the linkage limiting assembly is triggered to drive the buffer wheels adjacent to the initial buffer wheel to move synchronously, when the driven buffer wheels move to the corresponding first predetermined stroke, the linkage limiting assembly is triggered to drive another buffer wheel adjacent to the driven buffer wheels to move to the wire, in this way, the number of effective buffer wheels and the buffer zone capacity are increased step by step, and the control assembly is used for controlling the initial buffer wheel to continuously move to the wire in response to the decrease of the wire tension.

[0005] In a possible implementation, the initial buffer wheel is located in the middle of the buffer mechanism, and when the initial buffer wheel moves to the first predetermined stroke, the two buffer wheels adjacent to the initial buffer wheel are synchronously driven to move, then when the two buffer wheels adjacent to the initial buffer wheel move to the corresponding first predetermined stroke, the other buffer wheels adjacent to the two buffer wheels are synchronously driven to move, and the process is continuously and sequentially performed.

[0006] In a possible implementation, a limiting wheel is arranged between the adjacent buffer wheels, the limiting wheel cooperates with the buffer wheels to form a wavy wire buffer path by limiting the wire, and the wave amplitude gradually decreases from the middle to the two sides.

[0007] In a possible implementation, a ring-shaped constraint groove is formed in the buffer wheel.

[0008] In a possible implementation, the rewinding mechanism comprises a winding reel, a rewinding reel located above the winding reel and a wire pressing column provided with a spiral wire pressing groove, the winding reel and the wire pressing column rotate reversely synchronously, the wire is limited by the spiral wire pressing groove, so that the wire is wound on the winding reel in a spiral manner and is dynamically fed downward, and the wire falls to the winding reel after being separated from the winding reel.

[0009] In a possible implementation, the number of the wire columns is two, and the two wire columns are distributed in a central symmetric manner with respect to the axis of the winding reel.

[0010] In a possible implementation, the buffer wheel is located below the wire, the control assembly comprises a main elastic member and a secondary elastic member, the main elastic member is used for controlling the movement of the initial buffer wheel, and the secondary elastic member corresponds to each of the other buffer wheels and is in a compressed energy storage state before the corresponding buffer wheel moves.

[0011] In a possible implementation manner, the linkage limiting assembly comprises sliding seats corresponding to the buffer wheels one by one and the buffer wheels are rotationally installed on the corresponding sliding seats; the limiting structure limits the sliding seats to move synchronously.

[0012] The one or more technical solutions in the embodiments of the present application have the following technical effects: according to the metal wire straightening machine provided by the embodiments of the present application, the control assembly controls the initial buffer wheel to continuously move to increase the buffer capacity as the wire tension decreases, and in this process, the linkage limiting assembly is triggered step by step, so that the buffer capacity is expanded step by step, which not only can fully meet the buffer requirement of a large wire tension fluctuation range, but also forms a deformation path from the middle to both sides in the process of expanding the buffer capacity, so that the deformation amount of the wire presents a distribution characteristic of first increasing and then decreasing, so that the deformation amount of the wire before entering the straightening area is at a low level, thereby being beneficial to improving the stability of the straightening quality and the reliability of the system work. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a whole structure schematic diagram of a metal wire straightening machine provided by the embodiments of the present application.

[0014] Figure 2 is a partial sectional structure schematic diagram of a metal wire straightening machine provided by the embodiments of the present application.

[0015] Figure 3 is a structure schematic diagram of a control assembly and a linkage limiting assembly of a metal wire straightening machine provided by the embodiments of the present application.

[0016] Figure 4 is a structure schematic diagram of a limiting structure and a limiting head of a metal wire straightening machine provided by the embodiments of the present application.

[0017] Figure 5 is a structure schematic diagram of a rewinding mechanism of a metal wire straightening machine provided by the embodiments of the present application.

[0018] In the figure: 1, a pay-off reel; 2, a buffer mechanism; 21, a buffer wheel; 22, a linkage limiting assembly; 221, a limiting structure; 222, a sliding seat; 223, a limiting head; 23, a control assembly; 231, a main elastic member; 232, a secondary elastic member; 24, a limiting wheel; 25, a constraint groove; 26, a sliding rail structure; 3, a straightening mechanism; 4, a rewinding mechanism; 41, a take-up reel; 42, a rewinding reel; 43, a spiral wire pressing groove; 44, a wire pressing column; 5, a rack; 6, a protective cabin. DETAILED DESCRIPTION

[0019] In order to make the above objectives, features and advantages of the present application more obvious and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0020] Referring to Figure 1 and Figure 2 , a metal wire straightening machine comprises a wire reel 1, a buffer mechanism 2, a straightening mechanism 3 and a rewinding mechanism 4 (as shown in Figure 2 ) arranged in sequence from right to left, and further comprises a machine frame 5 provided with a protective cabin 6. The buffer mechanism 2 and the straightening mechanism 3 are both installed in the protective cabin 6, and the protective cabin 6 is provided with through openings at both ends for the wire to pass through.

[0021] During operation, the coiled wire is placed on the wire reel 1 and is drawn out from the wire reel 1, passes through the buffer mechanism 2 and the straightening mechanism 3 in sequence, and is finally wound up by the rewinding mechanism 4, thereby forming a continuous wire unwinding, straightening and rewinding integrated straightening system. The unwinding process of the straightening system relies on the traction force generated by the straightening mechanism 3 during straightening, and under the action of the traction force, the wire reel 1 is pulled to rotate and automatically perform the unwinding work.

[0022] During the unwinding process, as the remaining wire on the wire reel 1 decreases, the load decreases, which easily causes the wire tension to fluctuate and result in uneven tightness. The buffer mechanism 2 can dynamically adjust the buffer amount according to the actual slack degree of the wire, effectively absorb the tension change, ensure the smooth straightening process, and effectively adjust within a larger tension fluctuation range, and can effectively avoid the wire deformation being too large to affect the straightening effect and the stability of operation.

[0023] Referring to Figure 2 and Figure 3 , the buffer mechanism 2 comprises a linkage limiting assembly 22, a control assembly 23 and a plurality of buffer wheels 21. As shown in Figure 3As shown, the five buffer wheels 21 are arranged in sequence from right to left, and are all located below the wire. The middle buffer wheel 21 is the initial buffer wheel 21. When the wire tension decreases, the initial buffer wheel 21 moves upward to increase the buffer amount. As the wire tension further decreases, the initial buffer wheel 21 continues to move upward after moving to a first predetermined stroke, which will trigger the linkage limiting assembly 22 to drive the two adjacent buffer wheels 21 on the left and right to move upward synchronously, thereby further expanding the buffer capacity. Subsequently, as the wire tension continues to decrease, the buffer wheels 21 on the left and right sides will continue to move upward after reaching the respective predetermined strokes, and again trigger the linkage limiting assembly 22 to drive the buffer wheels 21 at the left and right ends to move upward synchronously, thereby realizing the step-by-step expansion of the buffer capacity.

[0024] Through the above multi-stage linkage mechanism, the buffer mechanism 2 can automatically and dynamically adjust the buffer amount according to the change of the wire tension, effectively inhibiting the influence of the tension fluctuation on the straightening process. And in the whole dynamic adjustment process, the deformation of the wire is transmitted from the middle to the two sides, and the deformation amount increases first and then decreases, so that the deformation amount of the wire before entering the straightening zone is at a low level, which is beneficial to improve the straightening quality and stability.

[0025] Referring to Figure 3 and Figure 4 , the linkage limiting assembly 22 includes a sliding seat 222 and a limiting structure 221. The sliding seat 222 corresponds to the buffer wheel 21 one by one, and the sliding seat 222 is vertically slidingly installed on the rear side wall of the protection cabin 6, and the buffer wheel 21 is rotatably installed on the corresponding sliding seat 222. The limiting structure 221 is located between adjacent buffer wheels 21. Among them, the limiting structure 221 between the initial buffer wheel 21 and the adjacent buffer wheels 21 on the left and right is an integral body, and the integral body is in the shape of an inverted T and is fixedly installed on the sliding seat 222 where the initial buffer wheel 21 is located, as shown in Figure 4As shown, the limiting structure 221 is located at the front side of the sliding seat 222, and the left and right ends of the T-shaped limiting structure 221 are vertically slidably installed in the protective bin 6 through the slide rail structure 26. The left and right sides of the initial buffer wheel 21 are provided with protruding limiting heads 223 on the sliding seats 222 adjacent to the buffer wheels 21. When the middle buffer wheel 21 moves up to the first predetermined stroke, the T-shaped limiting structure 221 abuts against the limiting heads 223 of the left and right adjacent sliding seats 222 from below, thereby forming linkage. Then, with the continuous upward movement of the middle buffer wheel 21, the left and right adjacent buffer wheels 21 are synchronously moved up. The limiting structure 221 between the left and right adjacent buffer wheels 21 and the left and right end buffer wheels 21 is an integral whole, which is in a linear shape and connects the sliding seats 222 of the left and right adjacent buffer wheels 21 to form an integral whole. The left and right ends of the linear limiting structure 221 are vertically slidably installed in the protective bin 6 through the slide rail structure 26, and the left and right ends of the sliding seats 222 are provided with protruding limiting heads 223. When the left and right adjacent buffer wheels 21 move up to the predetermined stroke, the linear limiting structure 221 abuts against the limiting heads 223 of the left and right ends of the sliding seats 222 from below, and when the adjacent buffer wheels 21 continue to move up, the left and right ends of the buffer wheels 21 are synchronously moved up.

[0026] The structure realizes step-by-step and collaborative expansion of the buffer capacity, ensures the orderly and controllable deformation of the wire, and provides stable feeding conditions for subsequent straightening work.

[0027] Referring to Figure 3 The limiting wheel 24 is arranged between the adjacent buffer wheels 21, is located above the wire, and is rotatably installed on the protective bin 6 and used for cooperating with the buffer wheels 21 to constrain the wire, thereby forming a wave-shaped wire buffer path. The amplitude of the wave-shaped path gradually decreases from the middle to the sides, which helps to realize gradient distribution of the wire deformation amount and further improves the stability and controllability of the buffer process.

[0028] Referring to Figure 3 The control assembly 23 includes a main elastic member 231 and a secondary elastic member 232. The main elastic member 231 is used for controlling the movement of the middle buffer wheel 21. When the system is initially operated, the wire tension is large, and the main elastic member 231 is in a compressed state. Then, with the decrease of the wire amount on the pay-off reel 1 and the decrease of the load, the wire tension decreases, and the main elastic member 231 gradually releases the elastic potential energy to move the middle buffer wheel 21 upward. With the continuous decrease of the wire tension, the main elastic member 231 continuously releases the elastic potential energy to continuously move the middle buffer wheel 21 upward, and then the remaining buffer wheels 21 are sequentially moved upward in a preset order through the linkage limiting assembly 22.

[0029] The secondary elastic member 232 corresponds to each buffer wheel 21. In the initial state, each secondary elastic member 232 is in a pre-compressed state under the action of gravity of the corresponding buffer wheel 21, storing elastic potential energy. When the linkage limiting assembly 22 triggers and the corresponding buffer wheel 21 needs to move upwards, the secondary elastic member 232 releases the elastic force at the same time, assisting the upward movement of the buffer wheel 21. This design effectively reduces the external driving force required for the upward movement of the buffer wheel 21, thereby reducing the load of the primary elastic member 231, improving the sensitivity of system response, energy efficiency, and smoothness of system operation.

[0030] The entire buffering process is based on pure mechanical linkage and elastic driving, without relying on complex electrical control systems. In addition, the control assembly 23 can also use a simple electrical control scheme, such as driving the preliminary buffer wheel 21 to move upwards by a pneumatic cylinder. In specific implementation, the unwinding time of the pay-off disc 1 can be divided into stages, and the preliminary buffer wheel 21 is controlled to move upwards step by step in an intermittent manner, combined with the linkage limiting assembly 22 to realize the step-by-step and collaborative expansion of the buffer zone capacity.

[0031] Referring to Figure 4 To further ensure the stability of system operation, a ring-shaped constraint groove 25 is provided on the surface of each buffer wheel 21, which is used to constrain the wire in the front and rear directions to prevent lateral sliding of the wire during the buffering process, ensuring smooth movement along the predetermined path.

[0032] Referring to Figure 2 and Figure 5 The rewinding mechanism 4 includes a winding disc 41, a rewinding disc 42 located above the winding disc 41, and two wire pressing columns 44 provided with spiral wire pressing grooves 43. The wire pressing columns 44 are pressed against the surface of the rewinding disc 42 by a pneumatic cylinder and can rotate synchronously in the opposite direction with the rewinding disc 42. The rewinding disc 42 is rotatably installed on the frame 5. The two wire pressing columns 44 are centrally symmetrically distributed with the axis of the winding disc 41 as the reference. During the winding process of the wire, the spiral wire pressing grooves 43 on the surface of the wire pressing columns 44 axially limit the wire, so that the wire is wound on the rewinding disc 42 in a spiral manner and is dynamically fed downward. After the wire finally separates from the rewinding disc 42, it falls onto the winding disc 41. The winding disc 41 and the rewinding disc 42 can be driven by a servo motor (not shown in the figure) respectively.

[0033] The winding disc 41 and the rewinding disc 42 rotate synchronously in the same direction, and generate a traction force during the rewinding process of the rewinding disc 42, which cooperates with the straightening mechanism 3 to jointly ensure the continuity and smoothness of the straightening process. The winding disc 41 and the pay-off disc 1 have similar structures, both being rotary discs with a limiting frame at the center, having good wire containing and guiding ability.

[0034] In the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0035] In the description of the present application, it should also be noted that, unless specifically defined and limited otherwise, the terms "provided", "connected", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, or slidingly connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The embodiments of the specific implementation are the preferred embodiments of the present application, not limited to the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A metal wire straightening machine, characterized in that: It includes a pay-off reel, a buffer mechanism, a straightening mechanism, and a rewinding mechanism arranged in sequence; The buffer mechanism includes: Several buffer rollers are arranged sequentially along the wire conveying path; When one of the buffer wheels designated as the initial buffer wheel moves towards the wire in response to the wire tension and continues to move, the linkage limiting component is triggered and drives the buffer wheel adjacent to the initial buffer wheel to move synchronously. After the driven buffer wheel moves to its corresponding first predetermined stroke, the linkage limiting component is triggered to drive the other adjacent buffer wheel to move towards the wire. This is triggered sequentially in this way, thereby gradually increasing the number of effective buffer wheels and the buffer capacity. A control component for responding to a decrease in wire tension, the control component controlling the initial buffer wheel to continuously move toward the wire; The initial buffer wheel is the buffer wheel located in the middle of the buffer mechanism. After the buffer wheel moves to the first predetermined stroke, it synchronously drives the adjacent buffer wheels on both sides to move. Then, after the adjacent buffer wheels on both sides move to the corresponding first predetermined stroke, they synchronously drive the other adjacent buffer wheel to move. This process continues in sequence.

2. The metal wire straightening machine according to claim 1, characterized in that: A limiting wheel is provided between the adjacent buffer wheels. The limiting wheel limits the wire and works with the buffer wheels to form a wave-shaped wire buffer path, and the wave amplitude gradually decreases from the middle to both sides.

3. A metal wire straightening machine according to any one of claims 1-2, characterized in that: The buffer wheel has an annular constraint groove.

4. A metal wire straightening machine according to claim 1, characterized in that: The rewinding mechanism includes a take-up reel, a rewinding plate located above the take-up reel, and a pressure post with a spiral pressure groove. The rewinding plate and the pressure post rotate synchronously in opposite directions. The spiral pressure groove limits the wire, causing the wire to be wound around the rewinding plate in a spiral manner and dynamically fed downwards. After leaving the rewinding plate, the wire falls onto the take-up reel.

5. A metal wire straightening machine according to claim 4, characterized in that: The number of pressure posts is two, and they are distributed in a centrally symmetrical manner with respect to the axis of the winding reel.

6. A metal wire straightening machine according to claim 1, characterized in that: The buffer wheel is located below the wire. The control component includes a main elastic element and a secondary elastic element. The main elastic element is used to control the initial movement of the buffer wheel. The secondary elastic element corresponds one-to-one with the other buffer wheels and is in a compressed energy storage state before the corresponding buffer wheel moves.

7. A metal wire straightening machine according to claim 1 or 6, characterized in that: The linkage limiting component includes: a sliding seat, which corresponds one-to-one with the buffer wheel and the buffer wheel is rotatably mounted on the corresponding sliding seat; The limiting structure is set on the sliding seat and limits the adjacent sliding seats, so that the adjacent sliding seats move synchronously.

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