A straightening mechanism based on constant tension hot drawing straightening of tungsten wire

Abstract

The utility model provides a straightening mechanism based on tungsten wire constant tension heat straightening, relates to tungsten wire straightening technology, specifically discloses main traction structure, and it is used for drawing tungsten wire of the output of guide wire structure, the output end of main traction structure is installed with auxiliary traction structure, and main traction structure includes main traction rack, and the lateral wall of main traction rack is installed with first guide pulley, first rewinding structure and second rewinding structure for guiding tungsten wire, the output of first rewinding structure and the output of second rewinding structure all are installed with guide pulley structure, and tungsten wire can obtain enough friction on first rewinding structure and second rewinding structure to form straightening tension, and adopt load cell sensor to detect tungsten wire straightening tension, then together with the straightening tension of main, auxiliary traction servo motor to tungsten wire forms closed loop control, and the curled tungsten wire is heated again through straightening furnace under the action of constant straightening tension, makes tungsten wire occur slight stretch plastic deformation, thereby realizes the straightening to tungsten wire.

Description

Technical Field

[0001] This utility model relates to the field of tungsten wire straightening technology, and more specifically, to a straightening mechanism based on constant tension thermal stretching of tungsten wire. Background Technology

[0002] Tungsten wire, a material with excellent properties such as high strength, high melting point, and low vapor pressure, is widely used in high-tech fields such as electric light sources, vacuum electronic devices, high-temperature furnace heating elements, semiconductor manufacturing equipment, cutting wires, and composite material reinforcements. In these applications, the straightness, residual stress state, and diameter uniformity of the tungsten wire are key indicators that directly affect its performance (such as heating uniformity, anti-sagging ability, processing accuracy, and fracture strength).

[0003] Traditional straightening equipment often uses a single traction system (such as a single traction wheel set or take-up machine) to control tension. Tension regulation methods are mostly open-loop or rely on angular displacement sensors (such as potentiometers) or linear displacement sensors (such as LVDTs) to detect the offset of the swing arm or floating roller to indirectly estimate tension. These indirect measurement methods suffer from problems such as response lag, low resolution, and insufficient accuracy. Especially when the tungsten wire is running at high speed (e.g., >1.5 m / s), the system's response speed to tension fluctuations (caused by coil eccentricity, material fluctuations, transmission fluctuations, etc.) cannot keep up, making it difficult to stabilize the straightening tension near the process set value. Tension fluctuations often exceed ±0.2 N. For high-performance tungsten wires with small diameters (e.g., <0.2 mm), excessive tension fluctuations can easily lead to wire breakage, uneven wire diameter (local stretching or loosening), or insufficient straightening. Utility Model Content

[0004] The purpose of this invention is to provide a straightening mechanism based on constant tension thermal straightening of tungsten wire, which addresses the shortcomings of existing technologies and solves the problems mentioned in the background.

[0005] The technical solution of this utility model is implemented as follows: This utility model provides a straightening mechanism based on constant tension thermal straightening of tungsten wire, including a main traction structure for pulling tungsten wire output from the guide wire structure; an auxiliary traction structure is installed at the output end of the main traction structure; the main traction structure includes a main traction frame; a first guide wheel for guiding the tungsten wire is installed on the side wall of the main traction frame; and a first rewinding structure for isolating the tension transmission of the tungsten wire is installed at the output end of the first guide wheel. The auxiliary traction structure includes an auxiliary traction frame, on the side wall of which a third guide wheel for guiding the tungsten wire is installed, and at the output end of the third guide wheel a second rewinding structure for isolating the tension transmission of the tungsten wire is installed. Both the output ends of the first and second rewinding structures are equipped with guide wheel structures.

[0006] In some technical solutions of this utility model, the first rewinding structure includes a flat wheel rotatably disposed at the bottom of the main traction frame, a wire-dividing wheel is installed on the top of the main traction frame, a plurality of wire-dividing grooves are opened on the outer circumferential surface of the wire-dividing wheel, and a drive mechanism connected to the flat wheel is provided on the side wall of the main traction frame.

[0007] In some technical solutions of this utility model, the first rewinding structure and the second rewinding structure have the same structure.

[0008] In some technical solutions of this utility model, the cross-section of the wire-splitting groove is V-shaped.

[0009] In some technical solutions of this utility model, the ratio of the outer diameter of the flat wheel to the bottom diameter of the V-groove of the wire-splitting wheel is ≥2:1.

[0010] In some technical solutions of this utility model, the guide wheel structure includes a mounting frame installed at the output end of the wire splitting wheel. A Load Cell sensor for measuring the traction force of tungsten wire is cantilevered on the mounting frame. The mounting frame is fixed to the side wall of the main traction frame. The free end of the Load Cell sensor is allowed to deform at the nanoscale and a gap is left between it and the side wall of the mounting frame. The second guide wheel is fixed to the free end of the Load Cell sensor.

[0011] In some technical solutions of this utility model, both the main traction structure and the auxiliary traction structure are driven by servo motors, which, together with the Load Cell sensor (5), form a closed-loop control of the tungsten wire straightening tension.

[0012] Some technical solutions of this utility model also include a straightening furnace installed between the main traction structure and the auxiliary traction structure.

[0013] Compared with existing technologies, this invention has at least the following advantages or beneficial effects: The tungsten wire can obtain sufficient friction in the first and second rewinding structures to form straightening tension, while isolating the mutual influence of straightening tension, drawing tension, and winding tension. A Load Cell sensor is used to detect the tungsten wire straightening tension, and together with the main and auxiliary traction servo motors, a closed-loop control is formed for the tungsten wire straightening tension. That is, the control system controls the real-time rotational speed of the first rewinding structure directly driven by the main traction servo motor and the second rewinding structure directly driven by the auxiliary traction servo motor based on the Load Cell sensor signal feedback. This allows for real-time adjustment of the tungsten wire's linear speed, thereby ensuring that the tungsten wire straightening tension remains stable at the setpoint. This allows the coiled tungsten wire to pass through the straightening furnace under approximately constant straightening tension, during which the tungsten wire undergoes slight stretching plastic deformation, guaranteeing the straightening effect of this structure. In the main and auxiliary winding structure, the tungsten wire is wound around the flat wheel multiple times, which significantly increases the effective contact length and wrap angle. The tungsten wire obtains sufficient friction on the flat wheel, which provides driving force for the straightening and effectively prevents the tungsten wire from slipping on the traction wheel during high-speed operation, ensuring the true and effective transmission of linear speed and applied tension. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first installation structure of the straightening structure in this utility model.

[0015] Figure 2 This is a schematic diagram of the second installation structure of the straightening structure in this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the main traction structure in this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the Load Cell sensor in this utility model.

[0018] Reference numerals in the attached diagram: 1. Main traction frame; 2. Flat wheel; 3. Wire separating wheel; 4. First guide wheel; 5. Load Cell sensor; 6. Mounting bracket; 7. Second guide wheel; 8. Auxiliary traction frame; 9. Third guide wheel; 10. Auxiliary traction servo motor; 11. Straightening furnace. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0021] Example This utility model provides a straightening mechanism based on constant tension thermal straightening of tungsten wire, such as... Figure 1 , Figure 2 As shown, it includes a straightening furnace 11, which is a long, box-shaped structure used to heat the tungsten wire to be straightened. A straightening channel for the tungsten wire to pass through is opened on the side wall of the straightening furnace 11. A main traction structure is installed on one side of the straightening furnace 11, and an auxiliary traction structure is installed on the other side of the straightening furnace 11. The main traction structure includes a main traction frame 1. A first guide wheel 4 for guiding the tungsten wire is installed on the side wall of the main traction frame 1 through a shaft. A first rewinding structure for isolating the tension transmission of the tungsten wire is installed at the output end of the first guide wheel 4. A guide wheel structure is installed at the output end of the first rewinding structure. The auxiliary traction structure includes an auxiliary traction frame 8, on the side wall of which a third guide wheel 9 for guiding tungsten wire is installed, and at the output end of the third guide wheel 9 a second rewinding structure for isolating the tension transmission of tungsten wire is installed.

[0022] After the tungsten wire emerges from the last set of drawing dies, it is positioned by the first guide wheel 4 and then guided into the flat wheel 2 within the first rewinding structure. It then rewinds multiple times between the separating wheel 3 and the flat wheel 2, with a total of 6 rewinds. The flat wheel 2 is the driving wheel, directly driven by the main traction servo motor, providing power to the tungsten wire wound on its surface. The separating wheel 3 is the driven wheel, separating the individual turns of tungsten wire. The finished tungsten wire is then guided by the guide wheel to the third guide wheel 9, and subsequently enters the flat wheel 2 within the second rewinding structure. It then rewinds multiple times between the separating wheel 3 and the flat wheel 2, before being guided into the take-up mechanism from the last groove of the separating wheel 3. The main traction structure provides a stable linear velocity V for straightening the tungsten wire. Z The auxiliary traction structure can stabilize the straightening tension by making minor real-time adjustments based on this stable linear velocity.

[0023] Sufficient friction can be obtained in the first and second rewinding structures of the tungsten wire to form straightening tension. Furthermore, the first rewinding structure directly driven by the main traction servo motor and the second rewinding structure directly driven by the auxiliary traction servo motor 10 can enable the finished tungsten wire to obtain a stable linear velocity V. Z This allows the finished tungsten wire to move at a uniform speed through the straightening furnace 11, improving the straightening effect of this structure on the tungsten wire.

[0024] In some technical solutions of this utility model, the first rewinding structure includes a flat wheel 2 rotatably mounted on the bottom of the main traction frame 1 via a shaft. A wire-dividing wheel 3 is installed on the top of the main traction frame 1. Several wire-dividing grooves are formed on the outer circumferential surface of the wire-dividing wheel 3, with a total of 6 sets of grooves. A drive mechanism connected to the flat wheel 2 is provided on the side wall of the main traction frame 1. Due to the large straightening tension exerted on the tungsten wire by the main traction structure and the auxiliary traction structure, the tungsten wire needs to be rewinded multiple times between the wire-dividing wheel 3 and the flat wheel 2 in the first rewinding structure. After being output from the first rewinding structure, it is rewinded multiple times again between the wire-dividing wheel 3 and the flat wheel 2 in the second rewinding structure. This allows the tungsten wire to be wound for a sufficient length on the surface of the flat wheel 2, utilizing the sufficient friction force on the flat wheel 2 to form straightening tension. The multiple rewinding prevents the tungsten wire on the rewinding structure from slipping due to insufficient friction. The main traction servo motor located in the first rewinding structure drives the flat wheel 2 at a constant speed to obtain a stable linear speed V. Z The stability of the main traction linear velocity applied to the tungsten wire by the first rewinding structure is the basis for ensuring the control accuracy of the tension and take-up tension of the straightened tungsten wire after the second rewinding structure in the subsequent auxiliary traction structure cooperates with the first rewinding structure.

[0025] Preferably, the drive mechanism is a servo motor.

[0026] In some technical solutions of this utility model, the first rewinding structure and the second rewinding structure have the same structure. This can save costs, simplify the installation process, and improve the versatility of the equipment.

[0027] In some technical solutions of this utility model, the cross-section of the wire-separating groove is V-shaped. The wire-separating wheel 3 is a driven wheel, and at least 6 V-shaped grooves are evenly distributed on the surface of the wire-separating wheel 3. The tungsten wire is wound in an arc shape around one V-shaped groove of the wire-separating wheel 3 for a small half turn, and then spirally wound around the cylindrical surface of the flat wheel 2 for a large half turn. After spirally winding around the cylindrical surface of the flat wheel 2 for a large half turn, the tungsten wire enters the next V-shaped groove of the wire-separating wheel 3 to continue winding. In this way, the tungsten wires of each turn are evenly distributed after multiple windings, avoiding the tungsten wires from getting tangled together and scratching each other.

[0028] The tungsten wire forms a semi-circular spiral on the cylindrical surface of the flat wheel 2, and the axial movement distance of any two adjacent spirals is equal to the V-groove spacing of the wire-splitting wheel 3.

[0029] In some technical solutions of this utility model, the flat wheel 2 is the driving wheel, and the ratio of the outer diameter of the flat wheel 2 to the bottom diameter of the V-groove of the wire separating wheel 3 is ≥2:1. The wire separating wheel 3 is designed to have a smaller diameter than the flat wheel 2, so that the tungsten wire can obtain a larger wrap angle when it is wound on the flat wheel 2, thereby maximizing the contact length between the tungsten wire and the flat wheel 2 and thus obtaining greater friction.

[0030] In some technical solutions of this utility model, the guide wheel structure includes a mounting frame 6 installed at the output end of the wire splitting wheel 3 and a second guide wheel 7. A load cell sensor 5 is mounted on the mounting frame 6, which is fixed to the side wall of the main traction frame 1. One end of the load cell sensor 5 is cantilevered and fixed to the side wall of the mounting frame 6. A 0.4mm gap is left between the free end of the load cell sensor 5 and the side wall of the mounting frame 6, allowing for nanoscale deformation. The second guide wheel 7 is fixed to the free end of the load cell sensor 5. The load cell sensor 5 is used to feedback the pressure signal applied by the tungsten wire to the second guide wheel 7. Since the load cell sensor only requires nanoscale deformation to respond, this tension detection method of the load cell sensor has much higher sensitivity and response speed than sensors that detect angular or linear displacement.

[0031] In some technical solutions of this utility model, a step is provided on the side wall of the mounting bracket 6, and the Load Cell sensor 5 is partially embedded in the step. This is to prevent the Load Cell sensor 5 from being damaged due to excessive force, and to provide a certain degree of protection for the Load Cell sensor 5.

[0032] In some technical solutions of this utility model, a fixing hole is provided on the side wall of the main traction frame 1, and a screw structure is installed in the fixing hole to facilitate the installation of the equipment.

[0033] During tungsten wire straightening: The main traction servo motor located within the main traction structure drives the flat wheel 2 within the first rewinding structure at a set linear speed V. Z The system operates at a constant speed, with the auxiliary traction servo motor 10, located within the auxiliary traction structure, using this constant speed as a feedforward reference speed for real-time speed adjustment. The control system performs PID calculations based on feedback signals from the Load Cell sensor 5 to control the real-time speed of the auxiliary traction servo motor 10: when the straightening tension detected by the Load Cell sensor 5 is equal to the set value, the auxiliary traction servo motor 10 operates at the reference speed; when the straightening tension detected by the Load Cell sensor 5 is greater than the set value, the real-time speed of the auxiliary traction servo motor 10 decreases, reducing the linear speed of the flat wheel 2 within the second rewinding structure, thereby relaxing the tungsten wire and reducing the straightening tension; when the straightening tension detected by the Load Cell sensor 5 is smaller than the set value, the real-time speed of the auxiliary traction servo motor 10 increases, increasing the linear speed of the flat wheel 2 within the second rewinding structure, thereby tightening the tungsten wire and increasing the straightening tension on the tungsten wire. The entire straightening system maintains a basically stable tungsten wire straightening tension through continuous dynamic adjustments.

[0034] When the tungsten wire travels at a high speed of 2 meters per second, the straightening system can ensure a straightening tension control accuracy of ≤0.05N. At the same time, tension adjustment is very convenient; the straightening tension setting value can be input as needed through the HMI (Human Machine Interface) window, and the control system can quickly and automatically apply the set tension to the tungsten wire for straightening.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A straightening mechanism based on constant tension thermal straightening of tungsten wire, characterized in that, It includes a main traction structure for pulling tungsten wires output from the guide wire structure; an auxiliary traction structure is installed at the output end of the main traction structure; the main traction structure includes a main traction frame (1); a first guide wheel (4) for guiding tungsten wires is installed on the side wall of the main traction frame (1); a first rewinding structure for isolating the tension transmission of tungsten wires is installed at the output end of the first guide wheel (4); The auxiliary traction structure includes an auxiliary traction frame, on the side wall of which a third guide wheel (9) for guiding tungsten wire is installed, and at the output end of the third guide wheel (9) a second rewinding structure for isolating the tension transmission of tungsten wire is installed; Both the output ends of the first and second rewinding structures are equipped with guide wheel structures.

2. The straightening mechanism based on constant tension thermal straightening of tungsten wire according to claim 1, characterized in that, The first rewinding structure includes a flat wheel (2) rotatably mounted at the bottom of the main traction frame (1), a wire splitting wheel (3) mounted on the top of the main traction frame (1), a number of wire splitting grooves are opened on the outer circumference of the wire splitting wheel (3), and a drive mechanism connected to the flat wheel (2) is provided on the side wall of the main traction frame (1).

3. A straightening mechanism based on constant tension thermal straightening of tungsten wire according to claim 1 or 2, characterized in that, The first rewinding structure and the second rewinding structure have the same structure.

4. The straightening mechanism based on constant tension thermal straightening of tungsten wire according to claim 2, characterized in that, The cross-section of the wire-splitting groove is V-shaped.

5. A straightening mechanism based on constant tension thermal straightening of tungsten wire according to claim 2, characterized in that, The ratio of the outer diameter of the flat wheel (2) to the bottom diameter of the V-groove of the splitting wheel (3) is ≥2:

1.

6. A straightening mechanism based on constant tension thermal straightening of tungsten wire according to claim 2, characterized in that, The guide wheel structure includes a mounting bracket (6) installed at the output end of the wire splitting wheel (3). A Load Cell sensor (5) for measuring the traction force of tungsten wire is fixed on the mounting bracket (6). The mounting bracket (6) is fixed to the side wall of the main traction frame (1). The free end of the Load Cell sensor (5) is allowed to deform at the nanoscale and a gap is left between it and the side wall of the mounting bracket (6). The second guide wheel (7) is fixed to the free end of the Load Cell sensor (5).

7. A straightening mechanism based on constant tension thermal straightening of tungsten wire according to claim 6, characterized in that, LoadCell sensor (5) detects the tungsten wire straightening tension. The main traction structure and the auxiliary traction structure are both driven by servo motors. The three work together to form a closed-loop control of the tungsten wire straightening tension.

8. A straightening mechanism based on constant tension thermal straightening of tungsten wire according to claim 1, characterized in that, It also includes a straightening furnace (11) installed between the main traction structure and the auxiliary traction structure.

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