Three servo constant tension output device and a torque release pay-off rack

Abstract

This invention discloses a three-servo constant tension output device and a reel-out wire feeding frame, comprising a first rotating shaft, a second rotating shaft, a wire reel, a first servo motor, a second servo motor, a turntable, a third servo motor, a tension rod, and a rotating frame. The second rotating shaft is rotatably sleeved on the outside of the first rotating shaft. The first servo motor drives the first rotating shaft to rotate, and the second servo motor drives the second rotating shaft to rotate. The turntable is rotatably sleeved on the outside of the second rotating shaft, and the third servo motor drives the turntable to rotate. The tension rod is connected to the turntable. The third servo motor is equipped with an absolute encoder, which is used to detect the position of the tension rod relative to the rotating frame. The rotating frame is fixed to the front end of the second rotating shaft. The wire reel is fixed to the front end of the first rotating shaft. This invention's three-servo constant tension output device can output stable and accurate wire feeding tension and has a simple structure.

Description

Technical Field

[0001] This invention relates to a constant tension output device, and more particularly to a three-servo constant tension output device and a de-twisting wire feeding frame. Background Technology

[0002] In the cable manufacturing process, the core wire wound on the reel needs to be unwound. Unwound structures include fixed-ground unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound unwound, as the core wire radius on the reel decreases, the length of conductor unwound per revolution of the reel decreases. If the unwound speed is not adjusted in time, it will affect the unwound stability of the core wire. To ensure a more stable output of the core wire, the unwound speed of the reel needs to be adjusted promptly to maintain a constant unwound tension. Therefore, a constant tension output device with a stable and precise tension output and a simple structure is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a three-servo constant tension output device that can output stable and accurate tension, ensure wire feeding stability, and has a simple structure.

[0004] Another objective of this invention is to provide a de-twist pay-off frame that offers stable pay-off, precise pay-off tension, and a simple structure.

[0005] To achieve the above objectives, the present invention provides a three-servo constant tension output device comprising a first rotating shaft, a second rotating shaft, a coil, a first servo motor, a second servo motor, a turntable, a third servo motor, a tension rod, and a rotating frame; the second rotating shaft is rotatably sleeved on the outside of the first rotating shaft; the first servo motor drives the first rotating shaft to rotate, and the second servo motor drives the second rotating shaft to rotate; the turntable is rotatably sleeved on the outside of the second rotating shaft, and the third servo motor drives the turntable to rotate; the first rotating shaft, the second rotating shaft, the coil, and the turntable are coaxially arranged; the tension rod is connected to the turntable; the third servo motor is equipped with an absolute encoder, which is used to detect the position of the tension rod relative to the rotating frame; the rotating frame is fixed to the front end of the second rotating shaft; the coil is fixed to the front end of the first rotating shaft, so that the core wire led out from the coil can sequentially pass around the rotating frame and the tension rod.

[0006] Compared with existing technologies, this invention uses a tension bar to allow the core wire drawn from the reel to pass over the tension bar. A third servo motor then outputs torque to the tension bar, thus providing tension to the core wire. Furthermore, by incorporating an absolute encoder within the third servo motor, the positional change of the tension bar relative to the rotating frame can be detected, indirectly indicating changes in the wire feeding speed. When the midpoint of the tension bar's swing relative to the rotating frame is set as zero, if the tension bar moves forward past zero, it indicates a slow wire feeding speed on the reel, requiring the first servo motor to accelerate the feeding; conversely, if it moves backward, it indicates a fast feeding speed, requiring the first servo motor to decelerate the feeding. Therefore, this invention ensures that the core wire is always fed at a constant and precise tension and uniform speed, with a very simple and convenient structure and control. In addition, since the absolute encoder in the third servo motor can detect changes in the position of the tension rod, there is no need to use other sensors on rotating components such as the rotating frame or the tension rod. This eliminates the need for a structure using conductive rings or carbon brushes for power supply and signal transmission, thus eliminating the influence on the electrical signal and further improving the accuracy of tension control.

[0007] Preferably, the three-servo constant tension output device further includes a transmission component, the input end of which is connected to the output end of the third servo motor, and the output end of which is connected to the turntable.

[0008] Specifically, the transmission assembly includes a first transmission pulley, a second transmission pulley, and a transmission belt. The first transmission pulley is disposed at the output end of the third servo motor, the second transmission pulley is disposed on the turntable, and the transmission belt is wound around the first transmission pulley and the second transmission pulley.

[0009] Preferably, a first transmission mechanism is provided between the first servo motor and the first rotating shaft.

[0010] Specifically, the first transmission mechanism includes a first driving pulley, a first driven pulley, and a first belt. The first driving pulley is located at the output end of the first servo motor, the first driven pulley is located on the first rotating shaft, and the first belt is wound around the first driving pulley and the first driven pulley.

[0011] Preferably, a second transmission mechanism is provided between the second servo motor and the second rotating shaft.

[0012] Specifically, the second transmission mechanism includes a second driving pulley, a second driven pulley, and a second belt. The second driving pulley is located at the output end of the second servo motor, the second driven pulley is located on the second rotating shaft, and the second belt is wound around the second driving pulley and the second driven pulley.

[0013] Preferably, the rotating frame is provided with a steering guide wheel, and the core wire can be led out from the tension rod and pass around the steering guide wheel. The steering guide wheel can be used to change the lead-out direction of the core wire, thereby allowing the core wire to be released from the central guide wheel of the rotating frame.

[0014] Preferably, the rotating frame is equipped with a wire guide wheel, which is located on the outer periphery of the wire spool, and the tension rod is located on the outer periphery of the wire guide wheel. This effectively utilizes the space around the wire spool, improves the structural compactness of the entire device, and makes the overall device smaller.

[0015] A wire unwinding and pay-off frame includes a guide wheel bracket and a three-servo constant tension output device. The guide wheel bracket is fixed on the rotating frame and located at the front end of the rotating frame. A first wire guide wheel and a second wire guide wheel are pivotally connected to the guide wheel bracket. The first wire guide wheel is disposed on the guide wheel bracket, and the second wire guide wheel is disposed in the middle of the guide wheel bracket. The core wire can pass around the first wire guide wheel and the second wire guide wheel and then be led out along the central axis of the guide wheel bracket. Attached Figure Description

[0016] Figure 1 This is a perspective view of the untwisting wire laying frame according to Embodiment 1 of the present invention.

[0017] Figure 2 This is an axial cross-sectional view of the three-servo constant tension output device according to Embodiment 1 of the present invention.

[0018] Figure 3 This is an axial sectional view of the untwisting wire laying frame according to Embodiment 1 of the present invention.

[0019] Figure 4 This is a left view of the untwisting wire laying frame according to Embodiment 1 of the present invention.

[0020] Figure 5 This is a structural diagram of the guide wheel bracket of the unwinding wire feeding frame according to Embodiment 1 of the present invention.

[0021] Figure 6 This is an axial sectional view of the untwisting wire laying frame according to Embodiment 2 of the present invention. Detailed Implementation

[0022] To illustrate the technical content, structural features, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] Figures 1 to 5 The structure of the untwisting wire feeder 100 according to Embodiment 1 of the present invention is shown.

[0024] like Figures 1 to 3As shown, the un-twisting and un-twisting wire release frame 100 of the present invention is suitable for releasing and un-twisting core wire 200, and includes a three-servo constant tension output device 1 and a guide wheel bracket 2. The three-servo constant tension output device 1 is mounted on a frame 3 and includes a first rotating shaft 11, a second rotating shaft 12, a wire spool 13, a first servo motor 14, a second servo motor 15, a bearing seat 16, a third servo motor 17, a turntable 18, a tension rod 19, and a rotating frame 110. The wire spool 13 in this application is a wire spool for winding the core wire 200. The second rotating shaft 12 is a hollow shaft with both ends through it, and the second rotating shaft 12 is rotatably sleeved on the outside of the first rotating shaft 11 through bearings installed at the front and rear ends of the inner hole. The front and rear ends of the first rotating shaft 11 extend out of the second rotating shaft 12; in this embodiment, the first rotating shaft 11 is solid. The wire spool 13 is fixed to the front end of the first rotating shaft 11. The first servo motor 14 is mounted on the frame 3 and drives the first rotating shaft 11 to rotate. The second servo motor 15 is mounted on the frame 3 and drives the second rotating shaft 12 to rotate. The bearing housing 16 is sleeved on the second rotating shaft 12. Bearings are provided between the front and rear ends of the second rotating shaft 12 and the bearing housing 16. The turntable 18 is rotatably sleeved on the second rotating shaft 12, and the third servo motor 17 can drive the turntable 18 to rotate. The third servo motor 17 is mounted on the frame 3 and has an absolute encoder (not shown in the figure) inside. The absolute encoder is electrically connected to the control system and can detect the position of the tension rod 19 relative to the rotating frame 110. The first rotating shaft 11, the second rotating shaft 12, the coil 13, the bearing housing 16, and the turntable 18 are arranged coaxially. The tension rod 19 is connected to the turntable 18. The central axis of the tension rod 19 is offset from the central axis of the first rotating shaft 11 and parallel to the central axis of the first rotating shaft 11. The tension rod 19 has a rotatable cylinder to facilitate the winding and conveying of the core wire 200. The rotating frame 110 is fixed to the front end of the second rotating shaft 12 and located at the front end of the turntable 18. The rotating frame 110 has front and rear plates, and a wire guide wheel 111 is provided between the front and rear plates. The wire guide wheel 111 is offset from the central axis of the first rotating shaft 11 and located on the outer periphery of the wire spool 13. The central axis of the wire guide wheel 111 is parallel to the central axis of the first rotating shaft 11. The tension rod 19 is located on the outer periphery of the revolution circle of the wire guide wheel 111. This can effectively utilize the space around the wire spool 13, improve the structural compactness of the entire device, and make the entire device smaller. The rotating frame 110 is also provided with a steering guide wheel 112. The central axis of the steering guide wheel 112 is perpendicular to the central axis of the rotating frame 110. The steering guide wheel 112 can be used to change the lead-out direction of the core wire 200, thereby making the output of the core wire 200 more accurate.The rotating frame 110 is also provided with two stops (not shown in the figure), and the tension rod 19 is located between the two stops. The stops can prevent the tension rod 19 from swinging excessively. When the tension rod 19 is located in the middle position between the two stops, the maximum angle between the tension rod 19 and either stop is 60 degrees, preferably 45 degrees.

[0025] Please see Figure 4 and Figure 5 The guide wheel bracket 2 is fixed to the front end of the front plate of the rotating frame 110. A first wire guide wheel 21 and a second wire guide wheel 22 are pivotally connected to the guide wheel bracket 2. The first wire guide wheel 21 is disposed on the outer periphery of the guide wheel bracket 2, and the second wire guide wheel 22 is disposed in the middle of the guide wheel bracket 2. The core wire 200 led out from the wire reel 13 passes sequentially around the exit guide wheel 111, the tension rod 19, the steering guide wheel 112, the first wire guide wheel 21 and the second wire guide wheel 22 and then leads forward along the central axis of the guide wheel bracket 2.

[0026] Please see again Figure 2 and Figure 3 The three-servo constant tension output device 1 further includes a transmission assembly 113. The input end of the transmission assembly 113 is connected to the output end of the third servo motor 17, and the output end of the transmission assembly 113 is connected to the turntable 18. Specifically, the transmission assembly 113 includes a first transmission pulley 113a, a second transmission pulley 113b, and a transmission belt 113c. The first transmission pulley 113a is disposed at the output end of the third servo motor 17, the second transmission pulley 113b is disposed on the turntable 18 and fixedly connected to the turntable 18, and the transmission belt 113c is wound around the first transmission pulley 113a and the second transmission pulley 113b.

[0027] For example Figure 2 and Figure 3 As shown, a first transmission mechanism 117 is provided between the first servo motor 14 and the first rotating shaft 11. Specifically, the first transmission mechanism 117 includes a first driving pulley 117a, a first driven pulley 117b, and a first belt 117c. The first driving pulley 117a is disposed at the output end of the first servo motor 14, the first driven pulley 117b is disposed at the rear end of the first rotating shaft 11, and the first belt 117c is wound around the first driving pulley 117a and the first driven pulley 117b.

[0028] For example Figure 2 and Figure 3As shown, a second transmission mechanism 118 is provided between the second servo motor 15 and the second rotating shaft 12. Specifically, the second transmission mechanism 118 includes a second driving pulley 118a, a second driven pulley 118b, and a second belt 118c. The second driving pulley 118a is located at the output end of the second servo motor 15, the second driven pulley 118b is located at the rear end of the second rotating shaft 12, and the second belt 118c is wound around the second driving pulley 118a and the second driven pulley 118b.

[0029] In summary and in combination Figure 3 and Figure 4 The working principle of the un-twist pay-off frame 100 in this embodiment is described in detail below:

[0030] First, the coil 13, fully wound with core wire 200, is installed at the front end of the first rotating shaft 11. The core wire 200 is then led out and sequentially wound through the lead-out guide wheel 111, the tension rod 19, the steering guide wheel 112, the first guide wheel 21, and the second guide wheel 22. Finally, the core wire 200 can be led forward to the stranding machine. The stranding machine is not the focus of this application, so its structure will not be described further. During the unwinding process, the control system starts the first servo motor 14. The first servo motor 14 drives the first drive pulley 117a, which in turn drives the first driven pulley 117b via the first belt 117c. The first driven pulley 117b drives the first rotating shaft 11 to rotate, which in turn drives the coil 13 to rotate and release the core wire 200. Simultaneously, the control system starts the third servo motor 17. The third servo motor 17 drives the turntable 18 via the transmission assembly 113. The turntable 18 transmits torque to the tension rod 19, thereby generating a constant tension on the core wire 200 on the tension rod 19. Furthermore, the control system starts the second servo motor 15 simultaneously with the first servo motor 14. The second servo motor 15 drives the second driving pulley 118a, which drives the second driven pulley 118b via the second belt 118c. The second driven pulley 118b drives the second rotating shaft 12 to rotate, which in turn drives the rotating frame 110 to rotate. The lead-out guide wheel 111 of the rotating frame 110 rotates circumferentially around the central axis of the rotating frame 110, simultaneously pulling the tension rod 19 under the winding action of the core wire 200. At this time, the core wire 200 is output with a constant tension and passes through the steering guide wheel 112, the first wire guide wheel 21, and the second wire guide wheel 22, and is output towards the stranding machine along the central axis of the rotating frame 110. In addition, since the rotating frame 110 rotates continuously while the core wire 200 is being output, the core wire 200 before passing the second wire guide wheel 22 will rotate circumferentially around the central axis of the rotating frame 110, thus achieving the purpose of untwisting the core wire 200.

[0031] The tension rod 19 is set to its zero point relative to the midpoint of the swing amplitude of the rotating frame 110. When the output speed of the core wire 200 slows down, the tension rod 19 moves past the zero point in the positive direction. At this time, the absolute encoder detects the position change of the tension rod 19 and sends a signal to the control system. The control system then controls the output speed of the first servo motor 14 to increase the speed, thereby accelerating the unwinding speed of the wire reel 13. The tension rod 19 then returns to the zero point, maintaining constant and precise unwinding tension, and the core wire 200 is output at a uniform speed. Conversely, when the output speed of the core wire 200 increases, the tension rod 19 moves past the zero point in the negative direction. The absolute encoder detects the position change of the tension rod 19 and sends a signal to the control system. The control system then controls the output speed of the first servo motor 14 to decrease the output speed, and the tension rod 19 returns to the zero point, thus slowing down the unwinding speed of the wire reel 13. At this time, the tension bar 19 can return to the zero position, thereby maintaining a constant wire tension and allowing the core wire 200 to be output at a uniform speed.

[0032] Compared with the prior art, the present invention, by setting a tension rod 19, allows the core wire led from the coil 13 to bypass the tension rod 19, and then uses a third servo motor 17 to output torque to the tension rod 19, thereby enabling the tension rod 19 to provide tension to the core wire. Furthermore, by installing an absolute encoder within the third servo motor 17, the positional change of the tension rod 19 relative to the rotating frame 110 can be detected, thus indirectly detecting changes in the wire feeding speed. When the midpoint of the swing amplitude of the tension rod 19 relative to the rotating frame 110 is set as zero, when the tension rod 19 crosses zero and moves in the positive direction, it indicates that the wire feeding speed of the coil 13 is slow, requiring control of the first servo motor 14 to accelerate the wire feeding; conversely, it indicates that the wire feeding speed of the coil 13 is fast, requiring control of the first servo motor 14 to decelerate the wire feeding. Therefore, the present invention can ensure that the core wire 200 is always fed at a constant and precise tension and uniform speed, and the structure and control are very simple and convenient. In addition, since the absolute encoder in the third servo motor 17 can detect the position change of the tension rod 19, there is no need to use other sensors on the rotating components such as the rotating frame 110 or the tension rod 19. Therefore, there is no need to use a structure of conductive ring or carbon brush for power supply and signal transmission, eliminating the influence on the electrical signal and further improving the accuracy of wire tension control.

[0033] Figure 6The structure of the untwisting wire release frame 100' according to Embodiment 2 of the present invention is shown. As shown in the figure, the structure of this embodiment is the same as that of Embodiment 1, except that the first rotating shaft 11' has a central hole 11a' that extends through both ends. The core wire 200 passes sequentially around the lead-out guide wheel 111, the tension rod 19, the steering guide wheel 112, the first wire guide wheel 21, and the second wire guide wheel 22, and then extends rearward along the central axis of the guide wheel bracket 2 and passes through the central hole 11a' of the first rotating shaft 11' before being led out. The only difference between the core wire 200 of the untwisting wire release frame 100' in Embodiment 2 and Embodiment 1 is the direction of its lead-out; the other technical effects are the same as those in Embodiment 1, and will not be repeated here.

[0034] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention shall still fall within the scope of the present invention.

Claims

1. A three-servo constant tension output device, characterized in that: The device includes a first rotating shaft, a second rotating shaft, a coil, a first servo motor, a second servo motor, a turntable, a third servo motor, a tension rod, and a rotating frame. The second rotating shaft is rotatably sleeved on the outside of the first rotating shaft. The first servo motor drives the first rotating shaft to rotate, and the second servo motor drives the second rotating shaft to rotate. The turntable is rotatably sleeved on the outside of the second rotating shaft, and the third servo motor drives the turntable to rotate. The first rotating shaft, the second rotating shaft, the coil, and the turntable are coaxially arranged. The tension rod is connected to the turntable. The third servo motor is equipped with an absolute encoder, which is used to detect the position of the tension rod relative to the rotating frame. The spool is fixed to the front end of the first rotating shaft; the rotating frame is fixed to the front end of the second rotating shaft; the rotating frame is provided with a wire guide wheel, the wire guide wheel is located on the outer periphery of the spool, and the tension rod is located on the outer periphery of the circumference of the wire guide wheel; The central axis of the tension bar is offset from the central axis of the first rotating shaft and is parallel to the central axis of the first rotating shaft, and the tension bar has a rotatable cylinder to facilitate the winding and conveying of the core wire; The rotating frame is also provided with two stops, and the tension rod is located between the two stops. The stops can prevent the tension rod from swinging excessively. When the tension rod is located in the middle position between the two stops, the maximum angle between the tension rod and either stop is 60 degrees. The rotating frame is also equipped with a steering guide wheel, the central axis of which is perpendicular to the central axis of the rotating frame; the core wire passes sequentially around the lead-out guide wheel, the tension rod, and the steering guide wheel. The absolute encoder, the first servo motor, the second servo motor, and the third servo motor are all electrically connected to the control system. The absolute encoder detects the position change signal of the tension rod relative to the rotating frame and sends it to the control system. The control system adjusts the speed of the first servo motor based on the signal feedback.

2. The three-servo constant tension output device as described in claim 1, characterized in that: The three-servo constant tension output device also includes a transmission component, the input end of which is connected to the output end of the third servo motor, and the output end of which is connected to the turntable.

3. The three-servo constant tension output device as described in claim 2, characterized in that: The transmission assembly includes a first transmission pulley, a second transmission pulley, and a transmission belt. The first transmission pulley is located at the output end of the third servo motor, the second transmission pulley is located on the turntable, and the transmission belt is wound around the first transmission pulley and the second transmission pulley.

4. The three-servo constant tension output device as described in claim 1, characterized in that: A first transmission mechanism is provided between the first servo motor and the first rotating shaft.

5. The three-servo constant tension output device as described in claim 4, characterized in that: The first transmission mechanism includes a first driving pulley, a first driven pulley, and a first belt. The first driving pulley is disposed at the output end of the first servo motor, the first driven pulley is disposed on the first rotating shaft, and the first belt is wound around the first driving pulley and the first driven pulley.

6. The three-servo constant tension output device as described in claim 1, characterized in that: A second transmission mechanism is provided between the second servo motor and the second rotating shaft.

7. The three-servo constant tension output device as described in claim 6, characterized in that: The second transmission mechanism includes a second driving pulley, a second driven pulley, and a second belt. The second driving pulley is located at the output end of the second servo motor, the second driven pulley is located on the second rotating shaft, and the second belt is wound around the second driving pulley and the second driven pulley.

8. A de-twisting wire feeder, characterized in that: The device includes a guide wheel bracket and a three-servo constant tension output device as described in any one of claims 1 to 7. The guide wheel bracket is fixed to the rotating frame and located at the front end of the rotating frame. A first wire guide wheel and a second wire guide wheel are pivotally connected to the guide wheel bracket. The first wire guide wheel is disposed on the outer periphery of the guide wheel bracket, and the second wire guide wheel is disposed in the middle part of the guide wheel bracket. The core wire passes through the output guide wheel, the tension rod, the steering guide wheel, the first wire guide wheel and the second wire guide wheel in sequence and is then led forward along the central axis of the guide wheel bracket.

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