Three servo constant tension tape wrapping mechanism

Abstract

The application discloses a three-servo constant-tension wrapping mechanism, which comprises a three-servo constant-tension output device, a roller support and a central pipe. The three-servo constant-tension output device comprises a first rotating shaft, a second rotating shaft, a tape reel, a first servo motor, a second servo motor, a rotating disc, a third servo motor, a tension rod and a rotating frame. The second rotating shaft is rotatably sleeved on 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 rotating disc is sleeved on the second rotating shaft, and the third servo motor drives the rotating disc to rotate. The tension rod is connected with the rotating disc. An absolute encoder is arranged in the third servo motor and used for detecting 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 tape reel is fixed to the front end of the first rotating shaft. The roller support is fixed to the rotating frame. The central pipe penetrates the center of the first rotating shaft and the roller support so that a core wire is conveyed in the pipe. The application can generate stable and accurate tape unwinding tension and has a simple structure.

Description

Technical Field

[0001] This invention relates to a constant tension tape wrapping machine, and more particularly to a three-servo constant tension tape wrapping mechanism. Background Technology

[0002] In the cable manufacturing process, the core wire and wrapping tape are first output separately. Simultaneously, the wrapping tape, after being adjusted by a tension mechanism, wraps around the core wire with a certain tension, thus combining the core wire and wrapping tape to form the cable. The wrapping tape is output at a constant speed under constant tension. However, as the wrapping tape is released from the reel, the radius of the reel decreases, and the length of wrapping tape released per revolution of the reel becomes shorter. If the release speed is not adjusted in time, the stability of the wrapping tape release will be affected. To ensure more stable wrapping tape output, the release speed of the reel needs to be adjusted promptly, and the release tension of the wrapping tape needs to be kept constant. Therefore, a constant tension wrapping tape mechanism that can generate stable and precise release tension and has a simple structure is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a three-servo constant tension tape wrapping mechanism that can generate stable and precise tape release tension, ensure tape release stability, and has a simple structure.

[0004] To achieve the above objectives, the present invention provides a three-servo constant tension wrapping mechanism comprising a three-servo constant tension output device, a roller support, and a central tube. The three-servo constant tension output device includes a first rotating shaft, a second rotating shaft, a 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 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 second rotating shaft, and the third servo motor drives the turntable to rotate. The first rotating shaft, the second rotating shaft, the reel, and the turntable are coaxially arranged. The tension rod is connected to the turntable. The third servo motor contains an absolute encoder, which is used to detect the tension. The position of the tension bar relative to the rotating frame; the rotating frame is fixed to the front end of the second rotating shaft; the belt reel is fixed to the front end of the first rotating shaft; the roller support is fixed to the rotating frame and located at the front end of the rotating frame, and a first belt guide roller and a second belt guide roller are pivotally connected to the roller support. The first belt guide roller is disposed on the outer periphery of the roller support, and the second belt guide roller is located in the same diameter direction as the first belt guide roller and is offset from the center of the roller support; the first rotating shaft has a hollow shaft structure, and the central tube passes through the center of the first rotating shaft and the roller support to allow the core wire to be transported in the tube; the wrapping tape led out from the belt reel can sequentially pass around the rotating frame, the tension bar, the first belt guide roller and the second belt guide roller and then wrap around the core wire.

[0005] Compared to existing technologies, this invention utilizes a tension bar to allow the tape leading from the reel to bypass the tension bar. A third servo motor then outputs torque to the tension bar, providing tension to the tape. Furthermore, by incorporating an absolute encoder within the third servo motor, the positional change of the tension bar relative to the rotating frame is detected, indirectly indicating changes in the tape unloading speed. By setting the midpoint of the tension bar's swing relative to the rotating frame as zero, when the tension bar crosses zero and moves in the positive direction, it indicates a slow tape unloading speed, requiring the first servo motor to accelerate unloading; conversely, it indicates a fast unloading speed, requiring the first servo motor to decelerate unloading. Therefore, the tape can be consistently and precisely conveyed at a uniform speed with constant tension, and the structure and control are very simple and convenient. 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 belt tension control.

[0006] 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.

[0007] 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.

[0008] Preferably, a first transmission mechanism is provided between the first servo motor and the first rotating shaft.

[0009] 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.

[0010] Preferably, a second transmission mechanism is provided between the second servo motor and the second rotating shaft.

[0011] 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.

[0012] Preferably, the rotating frame is equipped with a steering roller, and the strapping tape can be led out from the tension bar and pass around the steering roller. The steering roller allows the strapping tape to change its lead-out direction, thereby making the tape output more accurate.

[0013] Preferably, the rotating frame is equipped with a tape output roller, which is located on the outer periphery of the tape reel, and the tension bar is located on the outer periphery of the tape output roller. This effectively utilizes the space around the tape reel, improves the structural compactness of the entire device, and makes the overall device smaller.

[0014] Preferably, the roller support has a central hole at its center, through which the central tube passes; and the front end of the central tube has a wrapping eye for outputting the core wire. Attached Figure Description

[0015] Figure 1 This is a perspective view of the three-servo constant tension wrapping mechanism of the present invention.

[0016] Figure 2 This is an axial sectional view of the three-servo constant tension wrapping mechanism of the present invention.

[0017] Figure 3 This is a left view of the three-servo constant tension wrapping mechanism of the present invention.

[0018] Figure 4 This is a structural diagram of the roller support of the three-servo constant tension wrapping mechanism of the present invention. Detailed Implementation

[0019] 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.

[0020] like Figures 1 to 2As shown, the three-servo constant tension wrapping mechanism 100 of the present invention is suitable for simultaneously unloading the wrapping tape 200 and wrapping the core wire 300. It includes a three-servo constant tension output device 1, a roller support 2, and a central tube 4. 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 tape reel 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 tape reel 13 of this application winds the wrapping tape 200. The second rotating shaft 12 is a hollow shaft with both ends extending through it. The second rotating shaft 12 is rotatably sleeved on the outside of the first rotating shaft 11 via bearings installed at both ends of the inner hole. Both the front and rear ends of the first rotating shaft 11 extend beyond the second rotating shaft 12. The tape reel 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 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 belt disc 13, the bearing housing 16, and the turntable 18 are arranged coaxially. The tension bar 19 is connected to the turntable 18. The central axis of the tension bar 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 bar 19 has a rotatable cylinder to facilitate the winding and conveying of the wrapping tape 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 tape output roller 111 is provided between the front and rear plates. The tape output roller 111 is offset from the central axis of the first rotating shaft 11 and located on the outer periphery of the tape reel 13. The central axis of the tape output roller 111 is parallel to the central axis of the first rotating shaft 11. The tension bar 19 is located on the outer periphery of the revolution circle of the tape output roller 111. This can effectively utilize the space around the tape reel 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 roller 112, and the central axis of the steering roller 112 is perpendicular to the central axis of the rotating frame 110. The guide roller 112 can change the lead-out direction of the strapping tape 200, thereby making the output of the strapping tape 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 central angle between the tension rod 19 and either of the stops is 60 degrees, preferably 45 degrees.

[0021] Please see Figure 3 and Figure 4 The roller support 2 is fixed to the front end of the front plate of the rotating frame 110. A first guide roller 21 and a second guide roller 22 are pivotally connected to the roller support 2. The first guide roller 21 is disposed on the outer periphery of the roller support 2, and the second guide roller 22 is located in the same diametrical direction as the first guide roller 21 and is offset from the center of the roller support 2. More specifically, the roller support 2 is provided with an elongated groove 2a, and the first guide roller 21 is slidably disposed in the elongated groove 2a to adjust its distance relative to the center of the roller support 2, thereby adjusting the exit angle of the wrapping tape relative to the core wire 300. The wrapping tape 200, drawn from the reel 13, sequentially passes over the exit roller 111, the tension bar 19, the steering roller 112, the first guide roller 21, and the second guide roller 22 before being led forward. The first rotating shaft 11 has a hollow shaft structure. The roller support 2 has a central hole 23. The central tube 4 passes through the first rotating shaft 11 and the central hole 23 of the roller support 2 to transport the core wire 300 inside the tube. The central tube 4 is coaxial with the first rotating shaft 11. The front end of the central tube 4 has a wrapping eye 41 for outputting the core wire 300. The wrapping eye 41 can make the core wire 300 output more stably, so as to ensure the accuracy of subsequent wrapping and improve the quality of the wrapping. The wrapping tape 200 led out from the tape reel 13 passes sequentially around the output tape roller 111, the tension bar 19, the guide roller 112, the first pass tape roller 21, and the second pass tape roller 22 before wrapping around the core wire 300.

[0022] 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.

[0023] For example Figure 2As 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.

[0024] For example Figure 2 As 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.

[0025] In summary and in combination Figure 2 and Figure 3 The working principle of the three-servo constant tension tape machine 100 of the present invention will be described in detail below:

[0026] First, the core wire 300 is led forward along the central tube 4, passing through the central tube 4 and the roller support 2, and then leading forward from the central axis of the roller support 2. Next, the reel 13, fully wound with the tape 200, is installed at the front end of the first rotating shaft 11, leading the tape 200 out and sequentially passing it over the output roller 111, the tension bar 19, the guide roller 112, the first pass roller 21, and the second pass roller 22. During tape release, the control system starts the first servo motor 14, which drives the first drive pulley 117a. The first drive pulley 117a 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 reel 13 to release the tape 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 drive the tension rod 19, thereby generating a constant tension on the strapping 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 tape output roller 111 of the rotating frame 110 rotates circumferentially around its central axis, simultaneously pulling the tension rod 19 under the winding action of the strapping 200. At this point, the wrapping tape 200 is output with constant tension and, after passing through the guide roller 112, the first tape guide roller 21, and the second tape guide roller 22, wraps around the core wire 300. The core wire 300 is continuously led forward, and at the same time, the wrapping tape is continuously output and wraps around the core wire 300, ultimately forming a cable with an insulating outer layer.

[0027] 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 tape 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 unloading speed of the tape reel 13. The tension rod 19 then returns to the zero point, maintaining constant and precise unloading tension, and the tape 200 outputs at a uniform speed. Conversely, when the output speed of the tape 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 speed, and the tension rod 19 returns to the zero point, thus slowing down the unloading speed of the tape reel 13, maintaining constant unloading tension, and ensuring uniform tape output.

[0028] Compared with the prior art, the present invention provides tension to the tape by setting a tension rod 19, allowing the tape 200 led from the reel 13 to bypass the tension rod 19, and then using a third servo motor 17 to output torque to the tension rod 19. 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 tape unloading speed. By setting the midpoint of the swing amplitude of the tension rod 19 relative to the rotating frame 110 as the zero point, when the tension rod 19 crosses the zero point and moves in the positive direction, it indicates that the tape unloading speed of the reel 13 is slow, requiring control of the first servo motor 14 to accelerate the unloading; conversely, it indicates that the tape unloading speed of the reel 13 is fast, requiring control of the first servo motor 14 to decelerate the unloading. Therefore, the tape can be consistently and precisely conveyed at a uniform speed with constant tension, 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 tension control of the tension rod 19.

[0029] 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 wrapping mechanism, characterized in that: The device includes a three-servo constant tension output device, a roller support, and a central tube. The three-servo constant tension output device comprises a first rotating shaft, a second rotating shaft, a pulley, 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 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 second rotating shaft, and the third servo motor drives the turntable to rotate. The first rotating shaft, the second rotating shaft, the pulley, and the turntable are coaxially arranged. The tension rod is connected to the turntable. The third servo motor contains 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 tape reel is fixed to the front end of the first rotating shaft; the roller support is fixed to the rotating frame and located at the front end of the rotating frame, and a first guide roller and a second guide roller are pivotally connected to the roller support. The first guide roller is disposed on the outer periphery of the roller support, and the second guide roller is located on the same diameter direction as the first guide roller and is offset from the center of the roller support. The first rotating shaft has a hollow shaft structure, and the central tube passes through the center of the first rotating shaft and the roller support to allow the core wire to be transported inside the tube. The wrapping tape led out from the tape reel can sequentially pass around the rotating frame, the tension bar, the first guide roller and the second guide roller and then wrap around the core wire.

2. The three-servo constant tension wrapping mechanism 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 wrapping mechanism 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 wrapping mechanism 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 wrapping mechanism 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 wrapping mechanism 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 wrapping mechanism 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. The three-servo constant tension wrapping mechanism as described in claim 1, characterized in that: The rotating frame is equipped with a steering roller, and the strap can be led out from the tension bar and pass around the steering roller.

9. The three-servo constant tension wrapping mechanism as described in claim 1, characterized in that: The rotating frame is equipped with a tape output roller; the tape output roller is located on the outer periphery of the tape reel, and the tension bar is located on the outer periphery of the tape output roller.

10. The three-servo constant tension wrapping mechanism as described in claim 1, characterized in that: The roller support has a central hole at its center, through which the central tube passes; and the front end of the central tube has a wrapping eyepiece for core wire output.

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