Constant-tension pay-off drawing mechanism for tungsten filament

Abstract

The utility model provides a constant-tension pay-off drawing mechanism for tungsten filaments, which comprises a base, a pay-off servo motor, a pay-off spool, a wire passing wheel set, a traction wheel set and a drawing die, and traction motors are arranged at the end parts of a primary traction winding wheel and a secondary traction winding wheel; the pay-off servo motor and the traction motor are both connected with the HMI setting unit and the motor driver, a PID current loop is arranged in the motor driver, and the HMI setting unit and the motor driver are both connected with the controller. The servo motor can feed back the change of the torque, at the moment, the servo control system adjusts a current loop of the paying-off servo motor in real time, stable control over the target tension is achieved, the amplitude of vibration is greatly weakened, the improvement effect is quite visual, the quality abnormity problems such as wire breakage caused by shaking are solved, and the purposes of improving the product quality and the production efficiency are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of tungsten wire drawing, and specifically relates to a constant tension wire drawing mechanism for tungsten wire. Background Art

[0002] With the advancement of tungsten wire drawing technology, the process speed of wire diameters above 0.1mm has gradually increased. The conventional passive wire drawing machine basically uses a spring to adjust the belt to tighten and manually change the friction force. The tungsten wire shakes greatly during the first die drawing, causing equipment scraping and liquid throwing. Due to the unstable tension during the entire wire-paying process, problems such as abnormal product quality and wire breakage occur.

[0003] The vibration of the tungsten wire during drawing will cause the tension at the pay-off end to change, and the servo feedback torque will change accordingly, resulting in a significant increase in the amplitude. The increase in amplitude will cause quality problems such as wire breakage due to jitter, resulting in a decline in product quality and reduced production efficiency.

[0004] When the machine stops before the last die after the tungsten wire is paid off, the loose wire head will cause the tungsten wire on the take-up reel to become loose and pressed, thereby reducing the reliability of subsequent production.

[0005] When threading, the tungsten wire needs to be dragged slowly to ensure that the tungsten wire can be tautly arranged inside the wire-releasing device. This makes the threading process extremely slow and reduces the threading efficiency. Utility Model Content

[0006] In order to solve the above problems, this paper proposes a constant tension wire-paying and drawing mechanism for tungsten wire, which includes a base, a wire-paying servo motor, a wire-paying I-shaped wheel, a wire-passing wheel group, a traction wheel group and a drawing die. The axis of the wire-paying wheel group is axially connected to the wire-paying servo motor, and the outer side of the wire-paying I-shaped wheel is connected to the traction wheel group and the drawing die by tungsten wire winding. The wire-passing wheel group, the traction wheel group and the drawing die are all arranged horizontally and flush on the front side of the base, and a drawing die group is arranged between the traction wheel groups. The traction wheel group includes a primary traction winding wheel and a secondary traction winding wheel, and traction motors are arranged at the ends of the primary traction winding wheel and the secondary traction winding wheel. The pay-off servo motor and traction motor are both connected to the HMI setting unit and the motor driver. A PID current loop is provided in the motor driver. The HMI setting unit and the motor driver are both connected to the controller. Compared with conventional passive pay-off, the tungsten wire vibrates during drawing of the primary drawing die, causing the tension at the pay-off end to change. The servo motor can feedback the torque change accordingly. At this time, the servo control system adjusts the current loop of the pay-off servo motor in real time to achieve stable control of the target tension, greatly reduce the amplitude, and the improvement effect is very intuitive. It eliminates quality abnormalities such as broken wires caused by jitter, thereby achieving the purpose of improving product quality and production efficiency.

[0007] The base includes a base plate and a vertical assembly plate, a pay-off seat is provided on the left side of the base plate, a longitudinal pay-off servo motor is provided above the pay-off seat, a vertical assembly plate is provided horizontally and vertically on the right side of the pay-off seat, a wire-passing wheel group, a traction wheel group and a drawing die are provided flush on the front of the vertical assembly plate, the wheel groove of the pay-off I-shaped wheel is horizontally flush with the wire-passing wheel group, the traction wheel group and the drawing die, a tungsten wire is wound on the outer side of the pay-off I-shaped wheel, and a wire-passing wheel group is provided between the pay-off I-shaped wheel and the traction wheel group.

[0008] The first-level traction winding wheel and the second-level traction winding wheel are both horizontally flush with each other, the first-level drawing die and the second-level drawing die are both vertically flush with each other, the first-level drawing die and the second-level drawing die are both arranged between the first-level traction winding wheel and the second-level traction winding wheel, the rear ends of the first-level traction winding wheel and the second-level traction winding wheel are connected to the traction wheel group through a rotating shaft, the wire passing wheel group and the traction wheel group are both connected to the vertical assembly plate in an axle pin manner, and the drawing die is fixedly connected to the vertical assembly plate, replacing the original spring compression type passive wire release, stabilizing the tension on the line during the entire production process and improving the production yield; the servo system quickly feeds back the output of the wire release motor according to abnormal fluctuations in the tension on the line, eliminating large-scale jitter of the tungsten wire; accurately controls the downtime, reduces the wire pressing phenomenon of the take-up reel, and improves the yield of the subsequent production process; the threading mode can quickly reverse brake to avoid the loosening and falling off of the wire release reel, greatly improving the threading efficiency.

[0009] Beneficial effects:

[0010] Compared with conventional passive pay-off, the tungsten wire vibrates during drawing by the first-level drawing die, causing changes in the tension at the pay-off end. The servo motor can feedback the torque change accordingly. At this time, the servo control system adjusts the current loop of the pay-off servo motor in real time to achieve stable control of the target tension, greatly reduce the amplitude, and the improvement effect is very intuitive, eliminating quality abnormalities such as wire breakage caused by jitter, thereby achieving the purpose of improving product quality and production efficiency.

[0011] According to the real-time acquisition of motor running speed and other parameters by the servo pay-off system, the machine can be accurately controlled to stop before the last die after the tungsten wire pay-off is completed, completely eliminating the loose wire pressing phenomenon of the tungsten wire on the take-up reel caused by the loose wire head at the end of pay-off, and improving the reliability of subsequent production.

[0012] When threading, you can drag quickly, and the constant tension control will react quickly and brake in the reverse direction, tightening the tungsten wire at the pay-off end in real time to improve threading efficiency.

[0013] It replaces the original spring-loaded passive pay-off, stabilizes the tension on the line during the entire production process, and improves production yield. The servo system quickly feeds back the pay-off motor output according to abnormal fluctuations in the tension on the line, eliminating large-scale jitter of the tungsten wire. It accurately controls downtime, reduces the phenomenon of wire pressing on the take-up reel, and improves the yield of subsequent production processes. The threading mode can quickly reverse brake to prevent the pay-off reel from loosening and falling off, greatly improving threading efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a constant tension pay-off and drawing mechanism for tungsten wire;

[0015] Figure 2 It is a working front view of a constant tension pay-off and drawing mechanism for tungsten wire;

[0016] In the figure; 1. base plate, 2. vertical assembly plate, 3. pay-off seat, 4. pay-off wheel, 5. wire passing wheel group, 6. primary traction winding wheel, 7. primary drawing die, 8. secondary traction winding wheel, 9. secondary drawing die, 10. pay-off servo motor, 11. traction motor. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0018] Base plate 1, vertical assembly plate 2, pay-off seat 3, pay-off wheel 4, wire passing wheel group 5, primary traction winding wheel 6, primary drawing die 7, secondary traction winding wheel 8, secondary drawing die 9, pay-off servo motor 10, traction motor 11.

[0019] like Figure 1 , 2 As shown;

[0020] A constant tension wire-paying and drawing mechanism for tungsten wire, the wire-paying and drawing mechanism comprising a base, a wire-paying servo motor, a wire-paying I-shaped wheel, a wire-passing wheel group, a traction wheel group and a drawing die, the axis of the wire-paying wheel group is axially connected to the wire-paying servo motor, the outer side of the wire-paying I-shaped wheel is connected to the traction wheel group and the drawing die by tungsten wire winding, the wire-passing wheel group, the traction wheel group and the drawing die are all arranged horizontally and flush on the front side of the base, a drawing die group is arranged between the traction wheel groups, the traction wheel group comprises a primary traction winding wheel and a secondary traction winding wheel, the ends of the primary traction winding wheel and the secondary traction winding wheel are both provided with traction motors, the wire-paying servo motor and the traction motor are both connected to an HMI setting unit and a motor driver, a PID current loop is arranged in the motor driver, the HMI setting unit and the motor driver are both connected to a controller, the base comprises a base plate and a vertical assembly plate, the left side of the base plate is provided with A wire pay-off seat, wherein a longitudinal wire pay-off servo motor is arranged above the wire pay-off seat, a vertical assembly plate is arranged horizontally and vertically on the right side of the wire pay-off seat, a wire passing wheel group, a traction wheel group and a drawing die are arranged flush on the front side of the vertical assembly plate, the wheel groove of the wire pay-off I-shaped wheel is horizontally flush with the wire passing wheel group, the traction wheel group and the drawing die, tungsten wire is wound around the outer side of the wire pay-off I-shaped wheel, a wire passing wheel group is arranged between the wire pay-off I-shaped wheel and the traction wheel group, the primary traction winding wheel and the secondary traction winding wheel are horizontally flush with each other, the primary drawing die and the secondary drawing die are vertically flush with each other, the primary drawing die and the secondary drawing die are arranged between the primary traction winding wheel and the secondary traction winding wheel, the rear ends of the primary traction winding wheel and the secondary traction winding wheel are connected to the traction wheel group through a rotating shaft, the wire passing wheel group and the traction wheel group are connected to the vertical assembly plate in an axle pin manner, and the drawing die is fixedly connected to the vertical assembly plate.

[0021] Implementation examples;

[0022] During operation, the initial torque and production speed of the pay-off servo motor are set through the HMI setting unit to maintain a certain tension on the line; the controller collects the speed and position signals of the motor driver and the traction motor of the pay-off servo motor in real time, and provides real-time feedback. The controller calculates the real-time linear speed of the tungsten wire according to the rotation of the first-level traction reel, which is consistent with the linear speed calculated by the rotation of the pay-off I-shaped reel, thereby calculating the diameter of the pay-off reel in real time. Then, according to the pay-off reel tension F=pay-off servo motor 1 torque T / reel diameter / 2, the controller automatically calculates and changes the vertical torque of the pay-off motor according to the diameter change of the pay-off reel to ensure that the tension on the line at the beginning of pay-off is consistent with that on the tail section. The tungsten wire is drawn through the first-level drawing die, and the tension on the tungsten wire line fluctuates greatly. The pay-off servo motor feeds back the torque. The controller is used to control the pay-off servo motor in the torque control mode. The PID current loop control of the motor driver of the pay-off servo motor adjusts the motor output current and torque fluctuation amplitude in real time to stabilize the torque fluctuation amplitude and suppress the jitter on the line.

[0023] At the end of wire pay-off, when the positive pulling force of the first-stage traction reel disappears, the wire pay-off servo motor quickly stops or reverses due to the reverse torque. The controller collects the motor driver signal of the wire pay-off servo motor in real time and starts to calculate the downtime, so that the tungsten wire stops at the front end of the second-stage drawing die, and the tungsten wire and the take-up reel are in a straight state, ensuring that the tungsten wire and the take-up reel are in a straight state to prevent the take-up reel from loosening. At the same time, an audible and visual alarm is issued to indicate the end of production.

[0024] When threading, the controller automatically sets the reverse torque to adapt to the threading speed. The pay-off servo motor responds quickly and in real time to the reverse braking through the threading speed, so that the pay-off segment is always in a straight state, ensuring that the pay-off segment is always in a straight state to prevent the pay-off reel from loosening, greatly improving the threading efficiency.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A constant tension wire drawing mechanism for tungsten wire, the wire drawing mechanism comprising a base, a wire drawing servo motor, a wire drawing I-shaped wheel, a wire passing wheel group, a traction wheel group and a drawing die, characterized in that: The axis of the pay-off wheel group is axially connected to the pay-off servo motor, and the outer side of the pay-off I-shaped wheel is connected to the traction wheel group and the drawing die through tungsten wire winding. The wire passing wheel group, traction wheel group and drawing die are all arranged horizontally and flush on the front side of the base, and a drawing die group is arranged between the traction wheel groups. The traction wheel group includes a primary traction winding wheel and a secondary traction winding wheel. Traction motors are arranged at the ends of the primary traction winding wheel and the secondary traction winding wheel. The pay-off servo motor and the traction motor are both connected to the HMI setting unit and the motor driver. A PID current loop is arranged in the motor driver, and the HMI setting unit and the motor driver are both connected to the controller.

2. A constant tension wire drawing mechanism for tungsten wire according to claim 1, characterized in that: The base includes a base plate and a vertical assembly plate. A wire pay-off seat is provided on the left side of the base plate, a longitudinal wire pay-off servo motor is provided above the wire pay-off seat, a vertical assembly plate is provided horizontally and vertically on the right side of the wire pay-off seat, and a wire passing wheel group, a traction wheel group and a drawing die are provided flush on the front side of the vertical assembly plate.

3. A constant tension wire drawing mechanism for tungsten wire according to claim 1, characterized in that: The wheel groove of the wire-paying I-shaped wheel is horizontally flush with the wire-passing wheel group, the traction wheel group and the drawing die. Tungsten wire is wound around the outer side of the wire-paying I-shaped wheel, and a wire-passing wheel group is arranged between the wire-paying I-shaped wheel and the traction wheel group.

4. A constant tension wire drawing mechanism for tungsten wire according to claim 1, characterized in that: The primary traction winding wheel and the secondary traction winding wheel are both horizontally flush with each other, the primary drawing die and the secondary drawing die are both vertically flush with each other, and the primary drawing die and the secondary drawing die are both arranged between the primary traction winding wheel and the secondary traction winding wheel.

5. A constant tension wire drawing mechanism for tungsten wire according to claim 1, characterized in that: The rear ends of the primary traction winding wheel and the secondary traction winding wheel are connected to the traction wheel group through a rotating shaft.

6. A constant tension wire drawing mechanism for tungsten wire according to claim 2, characterized in that: The wire passing wheel set and the traction wheel set are both connected to the vertical assembly plate in an axle pin manner, and the drawing die is fixedly connected to the vertical assembly plate.

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