CN116812667A - Three-servo constant tension output device and back-twist pay-off rack - Google Patents

Abstract

The application discloses a three-servo constant tension output device and a back-torsion pay-off rack, comprising a first rotating shaft, a second rotating shaft, a wire coil, a first servo motor, a second servo motor, a turntable, a third servo motor, a tension rod and a rotating rack, wherein the first rotating shaft is connected with the first servo motor; the second rotating shaft is rotatably sleeved outside 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 rotary table is rotatably sleeved outside the second rotating shaft, and the third servo motor drives the rotary table to rotate; the tension rod is connected with the turntable; an absolute encoder is arranged in the third servo motor and is used for detecting the position of the tension rod relative to the rotating frame; the rotating frame is fixed at the front end of the second rotating shaft; the wire coil is fixed at the front end of the first rotating shaft. The three-servo constant tension output device can output stable and accurate paying-off tension and is simple in structure.

Description

Three-servo constant tension output device and back-twist pay-off rack

Technical Field

The application relates to a constant tension output device, in particular to a three-servo constant tension output device and a back-twist pay-off rack.

Background

In the production process of the cable, the core wire wound on the wire coil is required to be paid off, and the paying-off structure is divided into fixed ground paying-off, rotary frame rotary untwisting paying-off and other forms. However, for the mode of rotating the rotary frame and back-twisting the paying-off, as the core wire on the wire coil pays off, the radius of the core wire of the wire coil is smaller and smaller, and the length of the wire released by each rotation of the wire coil is shorter and shorter, if the paying-off speed is not timely adjusted, the paying-off stability of the core wire can be affected. In order to make the core wire output more stably, the paying-off speed of the wire coil needs to be adjusted in time so as to keep the paying-off tension of the core wire constant. Therefore, there is a need for a constant tension output device that can output stable and accurate tension with a simple structure.

Disclosure of Invention

The application aims to provide a three-servo constant tension output device which can output stable and accurate tension, ensure paying-off stability and has a simple structure.

The application further aims to provide a back-twist pay-off rack which is stable in pay-off, accurate in pay-off tension and simple in structure.

In order to achieve the above purpose, the three-servo constant tension output device provided by the application comprises a first rotating shaft, a second rotating shaft, a wire 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 outside 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 rotary table is rotatably sleeved outside the second rotating shaft, and the third servo motor drives the rotary table to rotate; the first rotating shaft, the second rotating shaft, the wire coil and the rotary table are coaxially arranged; the tension rod is connected with the turntable; an absolute encoder is arranged in the third servo motor and is used for detecting the position of the tension rod relative to the rotating frame; the rotating frame is fixed at the front end of the second rotating shaft; the wire coil is fixed at the front end of the first rotating shaft, so that a core wire led out of the wire coil can sequentially bypass the rotating frame and the tension rod.

Compared with the prior art, the application has the advantages that the tension rod is arranged, the core wire led out of the wire coil bypasses the tension rod, and the third servo motor is used for outputting torque to the tension rod, so that the tension rod provides tension for the core wire. And an absolute encoder is arranged in the third servo motor, and the position change of the tension rod relative to the rotating frame is detected by using the absolute encoder, so that the change of the paying-off speed can be indirectly detected. When the tension rod is arranged at the zero point relative to the middle position of the swing amplitude of the rotating frame, when the tension rod moves forward beyond the zero point, the paying-off speed of the wire coil is slow, the first servo motor needs to be controlled to accelerate paying-off, otherwise, the paying-off speed of the wire coil is fast, and the first servo motor needs to be controlled to decelerate and pay-off. Therefore, the application can always keep constant and accurate tension to convey the core wire at a constant speed, and has simple and convenient structure and control. In addition, because the absolute encoder in the third servo motor can detect the position change of the tension rod, other sensors are not needed to be used on the rotating frame or the rotating parts of the tension rod, so that a structure of a conducting ring or a carbon brush is not needed to be used for supplying power and transmitting signals, the influence on an electric signal is eliminated, and the accuracy of paying-off tension control is further improved.

Preferably, the three-servo constant tension output device further comprises a transmission assembly, wherein the input end of the transmission assembly is connected with the output end of the third servo motor, and the output end of the transmission assembly is connected with the turntable.

Specifically, the transmission assembly comprises a first transmission belt pulley, a second transmission belt pulley and a transmission belt, wherein the first transmission belt pulley is arranged at the output end of the third servo motor, the second transmission belt pulley is arranged on the turntable, and the transmission belt is wound on the first transmission belt pulley and the second transmission belt pulley.

Preferably, a first transmission mechanism is arranged between the first servo motor and the first rotating shaft.

Specifically, the first transmission mechanism comprises a first driving belt pulley, a first driven belt pulley and a first belt, wherein the first driving belt pulley is arranged at the output end of the first servo motor, the first driven belt pulley is arranged on the first rotating shaft, and the first belt is wound on the first driving belt pulley and the first driven belt pulley.

Preferably, a second transmission mechanism is arranged between the second servo motor and the second rotating shaft.

Specifically, the second transmission mechanism comprises a second driving belt pulley, a second driven belt pulley and a second belt, wherein the second driving belt pulley is arranged at the output end of the second servo motor, the second driven belt pulley is arranged on the second rotating shaft, and the second belt is wound on the second driving belt pulley and the second driven belt pulley.

Preferably, the rotating frame is provided with a steering guide wheel, and the core wire can bypass the steering guide wheel after being led out from the tension rod. The guiding direction of the core wire can be changed by using the steering guide wheel, and the core wire is further discharged from the central guide wheel of the rotating frame.

Preferably, the rotary frame is provided with an outgoing line guide wheel, the outgoing line guide wheel is positioned at the periphery of the wire coil, and the tension rod is positioned at the periphery of the outgoing line guide wheel. Therefore, the peripheral space of the wire coil can be effectively utilized, the structural compactness of the whole device is improved, and the whole device is smaller in size.

The back-twist pay-off rack comprises a guide wheel support and a three-servo constant-tension output device, wherein the guide wheel support is fixed on the rotating frame and positioned at the front end of the rotating frame, a first wire passing guide wheel and a second wire passing guide wheel are pivoted on the guide wheel support, the first wire passing guide wheel is arranged on the guide wheel support, the second wire passing guide wheel is arranged in the middle of the guide wheel support, and a core wire can be led out along the central axis direction of the guide wheel support after bypassing the first wire passing guide wheel and the second wire passing guide wheel.

Drawings

Fig. 1 is a perspective view of a back-twist pay-off rack according to a first embodiment of the present application.

FIG. 2 is a schematic diagram of an axial cross-section of a three-servo constant tension output device according to a first embodiment of the present application.

Fig. 3 is an axial cross-sectional view of a back-twist pay-off rack according to a first embodiment of the present application.

Fig. 4 is a left side view of a back-twist pay-off rack according to a first embodiment of the present application.

Fig. 5 is a block diagram of a guide pulley bracket of a back-twist pay-off rack according to a first embodiment of the present application.

Fig. 6 is an axial cross-sectional view of a back-twist pay-off rack according to a second embodiment of the present application.

Detailed Description

In order to describe the technical content, the constructional features and the effects achieved by the present application in detail, the following description is made with reference to the embodiments in conjunction with the accompanying drawings.

Fig. 1 to 5 show a structure of a back-twist pay-off rack 100 according to a first embodiment of the present application.

As shown in fig. 1 to 3, the untwisting pay-off stand 100 of the present application is suitable for paying off and untwisting a 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 arranged on a frame 3 and comprises a first rotating shaft 11, a second rotating shaft 12, a wire coil 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 coil 13 of the present application is a wire coil for winding the core wire 200. The second rotating shaft 12 is a hollow shaft with two through ends, and the second rotating shaft 12 is rotatably sleeved outside the first rotating shaft 11 through bearings arranged at the front end and the rear end 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 shaft 11 is solid. The wire coil 13 is fixed to the front end of the first rotating shaft 11. The first servo motor 14 is arranged on the frame 3 and drives the first rotating shaft 11 to rotate, and the second servo motor 15 is arranged on the frame 3 and drives the second rotating shaft 12 to rotate; the bearing seat 16 is sleeved outside the second rotating shaft 12; bearings are arranged between the second rotating shaft 12 and the front and rear ends of the bearing seat 16. The turntable 18 is rotatably sleeved outside the second rotating shaft 12, and the third servo motor 17 can drive the turntable 18 to rotate. The third servo motor 17 is disposed on the frame 3, and an absolute encoder (not shown in the figure) is disposed in the third servo motor 17, and the absolute encoder is electrically connected to a 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 wire coil 13, the bearing seat 16 and the turntable 18 are coaxially arranged. The tension rod 19 is connected with the turntable 18, the central axis of the tension rod 19 deviates from the central axis of the first rotating shaft 11 and is parallel to the central axis of the first rotating shaft 11, and a rotatable cylinder is arranged on the tension rod 19 so as to facilitate winding and conveying of the core wire 200. The rotating frame 110 is fixed at the front end of the second rotating shaft 12 and is located at the front end of the turntable 18, the rotating frame 110 has a front plate and a rear plate, an outgoing guide wheel 111 is disposed between the front plate and the rear plate, the outgoing guide wheel 111 is offset from the central axis of the first rotating shaft 11 and is located at the periphery of the wire coil 13, and the central axis of the outgoing guide wheel 111 is parallel to the central axis of the first rotating shaft 11. The tension rod 19 is positioned at the periphery of the revolution circumference of the wire outlet guide wheel 111; therefore, the surrounding space of the wire coil 13 can be effectively utilized, the structural compactness of the whole device is improved, and the whole device is smaller in size. The rotating frame 110 is further provided with a steering guide wheel 112, and the central axis of the steering guide wheel 112 is perpendicular to the central axis of the rotating frame 110. The guiding direction of the core wire 200 can be changed by using the steering guide wheel 112, so that the core wire 200 can be output more accurately. The rotating frame 110 is further provided with two stoppers (not shown), and the tension rod 19 is located between the two stoppers, and the stoppers can prevent the tension rod 19 from excessively swinging. When the tension rod 19 is located at the middle position of the two stoppers, the maximum angle of the central angle between the tension rod 19 and any stopper is 60 degrees, preferably 45 degrees.

Referring to fig. 4 and 5, the guide wheel bracket 2 is fixed to the front end of the front plate of the rotating frame 110. The guide wheel bracket 2 is pivoted with a first wire passing guide wheel 21 and a second wire passing guide wheel 22, the first wire passing guide wheel 21 is arranged on the periphery of the guide wheel bracket 2, the second wire passing guide wheel 22 is arranged in the middle of the guide wheel bracket 2, and a core wire 200 led out from the wire coil 13 sequentially bypasses the wire outlet guide wheel 111, the tension rod 19, the steering guide wheel 112, the first wire passing guide wheel 21 and the second wire passing guide wheel 22 and is led out forwards along the central axis direction of the guide wheel bracket 2.

Referring to fig. 2 and 3, the three-servo constant tension output device 1 further includes a transmission assembly 113, an input end of the transmission assembly 113 is connected to an output end of the third servo motor 17, and an 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 with the turntable 18, and the transmission belt 113c is wound on the first transmission pulley 113a and the second transmission pulley 113 b.

As shown in fig. 2 and 3, a first transmission mechanism 117 is provided between the first servomotor 14 and the first rotary 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.

As shown in fig. 2 and 3, a second transmission mechanism 118 is disposed between the second servomotor 15 and the second rotary shaft 12. Specifically, the second transmission mechanism 118 includes a second driving pulley 118a, a second driven pulley 118b, and a second belt 118c, wherein the second driving pulley 118a is disposed at the output end of the second servo motor 15, the second driven pulley 118b is disposed 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.

In summary, with reference to fig. 3 and 4, the following describes the working principle of the untwisted wire stand 100 according to the first embodiment in detail, as follows:

first, the wire coil 13 wound with the core wire 200 is mounted on the front end of the first rotating shaft 11, the core wire 200 is led out and sequentially wound through the wire outlet guide wheel 111, the tension rod 19, the steering guide wheel 112, the first wire passing guide wheel 21 and the second wire passing guide wheel 22, and finally the core wire 200 can be led to the front wire twisting machine, which is not an important point of the present application, and thus the structure thereof is not stated. During paying off, the control system controls the first servo motor 14 to start, the first servo motor 14 drives the first driving belt pulley 117a, and the first driving belt pulley 117a drives the first driven belt pulley 117b through the first belt 117 c. The first driven pulley 117b drives the first rotating shaft 11 to rotate, and the first rotating shaft 11 drives the wire coil 13 to rotate to release the core wire 200. At the same time, the control system controls the third servo motor 17 to start, at this time, the third servo motor 17 drives the turntable 18 through the transmission assembly 113, and the turntable 18 transmits torque to drive the tension rod 19, so as to generate a constant tension on the core wire 200 on the tension rod 19. And, the control system controls the second servo motor 15 to start simultaneously with the first servo motor 14, the second servo motor 15 drives the second driving pulley 118a, and the second driving pulley 118a drives the second driven pulley 118b through the second belt 118 c. The second driven pulley 118b drives the second rotating shaft 12 to rotate, the second rotating shaft 12 drives the rotating frame 110 to rotate, the wire outlet guide wheel 111 of the rotating frame 110 rotates circumferentially around the central axis of the rotating frame 110, and simultaneously pulls the tension rod 19 under the winding action of the core wire 200. The core wire 200 is then output at a constant tension, and is output in the wire twisting machine direction along the central axis direction of the rotating frame 110 via the steering guide wheel 112, the first wire guide wheel 21, and the second wire guide wheel 22. In addition, since the rotating frame 110 continuously rotates while the core wire 200 is output, the core wire 200 passing through the front of the second wire guide wheel 22 rotates circumferentially around the central axis of the rotating frame 110, so that the core wire 200 can be untwisted.

The intermediate position of the swing of the tension rod 19 with respect to the rotating frame 110 is set as a zero point, and when the output speed of the core wire 200 becomes slow, the tension rod 19 moves forward across the zero point. At this time, the absolute encoder may detect the position change of the tension rod 19 and send a signal to the control system, and the control system controls the output rotation speed of the first servo motor 14 through the signal, so as to increase the rotation speed, thereby achieving the purpose of increasing the paying-off speed of the wire coil 13. At this time, the tension rod 19 returns to the zero position, so that the paying-off tension is kept constant and accurate, and the core wire 200 is output at a constant speed. Conversely, when the output speed of the core wire 200 becomes high, the tension rod 19 moves in the negative direction across the zero point. At this time, the absolute encoder may detect the position change of the tension rod 19 and send a signal to the control system, and the control system controls the output rotation speed of the first servo motor 14 through the signal, so as to slow down the output rotation speed, and the tension rod 19 may return to the zero position, so as to achieve the purpose of slowing down the paying-off speed of the wire coil 13. At this time, the tension lever 19 returns to the zero position again, thereby maintaining the constant paying-out tension and allowing the core wire 200 to be output at a constant speed.

Compared with the prior art, the application has the advantages that the tension rod 19 is arranged, so that the core wire led out of the wire coil 13 bypasses the tension rod 19, and the third servo motor 17 is used for outputting torque to the tension rod 19, so that the tension rod 19 provides tension for the core wire. Further, by providing an absolute encoder in the third servo motor 17, the change in the wire paying-out speed can be indirectly detected by detecting the change in the position of the tension lever 19 with respect to the rotating frame 110 by the absolute encoder. When the middle position of the tension rod 19, which is set to be the zero point, with respect to the swing of the rotating frame 110, is set, when the tension rod 19 moves forward beyond the zero point, it is indicated that the paying-off speed of the wire coil 13 is slow, and the first servo motor 14 needs to be controlled to accelerate the paying-off, whereas, it is indicated that the paying-off speed of the wire coil 13 is fast, and it is indicated that the first servo motor 14 needs to be controlled to decelerate the paying-off. Therefore, the present application can always maintain constant and accurate tension for the core wire 200 to be conveyed at a constant 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, it is not necessary to use other sensors on the rotating frame 110 or the rotating parts of the tension rod 19, so that a structure of a conductive ring or a carbon brush is not necessary to supply power and transmit signals, the influence on the electric signal is eliminated, and the accuracy of controlling the paying-off tension is further improved.

Fig. 6 shows the structure of a untwisted wire holder 100' according to a second embodiment of the present application. As shown in the drawing, the structure of this embodiment is the same as that of the first embodiment, except that the first rotating shaft 11 'is provided with a central hole 11a' through which two ends are penetrated, and the core wire 200 sequentially bypasses the wire outlet guide wheel 111, the tension rod 19, the steering guide wheel 112, the first wire passing guide wheel 21 and the second wire passing guide wheel 22, and then extends backward along the central axis direction of the guide wheel bracket 2 and is led out after passing through the central hole 11a 'of the first rotating shaft 11'. The core wire 200 of the untwisting wire holder 100' of the second embodiment is different from that of the first embodiment only in the direction of extraction, and other technical effects are the same as those of the first embodiment, and the description thereof will not be repeated.

The foregoing disclosure is merely illustrative of the principles of the present application, and thus, it is intended that the scope of the application be limited thereto and not by this disclosure, but by the claims appended hereto.

Claims (10)

1. A three-servo constant tension output device is characterized in that: the device comprises a first rotating shaft, a second rotating shaft, a wire 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 outside 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 rotary table is rotatably sleeved outside the second rotating shaft, and the third servo motor drives the rotary table to rotate; the first rotating shaft, the second rotating shaft, the wire coil and the rotary table are coaxially arranged; the tension rod is connected with the turntable; an absolute encoder is arranged in the third servo motor and is used for detecting the position of the tension rod relative to the rotating frame; the rotating frame is fixed at the front end of the second rotating shaft; the wire coil is fixed at the front end of the first rotating shaft, so that a core wire led out of the wire coil can sequentially bypass the rotating frame and the tension rod.

2. The three-servo constant tension output device as defined in claim 1, wherein: the three-servo constant tension output device further comprises a transmission assembly, wherein the input end of the transmission assembly is connected with the output end of the third servo motor, and the output end of the transmission assembly is connected with the turntable.

3. The three-servo constant tension output device as defined in claim 2, wherein: the transmission assembly comprises a first transmission belt pulley, a second transmission belt pulley and a transmission belt, wherein the first transmission belt pulley is arranged at the output end of the third servo motor, the second transmission belt pulley is arranged on the turntable, and the transmission belt is wound on the first transmission belt pulley and the second transmission belt pulley.

4. The three-servo constant tension output device as defined in claim 1, wherein: a first transmission mechanism is arranged between the first servo motor and the first rotating shaft.

5. The three-servo constant tension output device as defined in claim 4, wherein: the first transmission mechanism comprises a first driving belt pulley, a first driven belt pulley and a first belt, wherein the first driving belt pulley is arranged at the output end of the first servo motor, the first driven belt pulley is arranged on the first rotating shaft, and the first belt is wound on the first driving belt pulley and the first driven belt pulley.

6. The three-servo constant tension output device as defined in claim 1, wherein: and a second transmission mechanism is arranged between the second servo motor and the second rotating shaft.

7. The three-servo constant tension output device as defined in claim 6, wherein: the second transmission mechanism comprises a second driving belt pulley, a second driven belt pulley and a second belt, wherein the second driving belt pulley is arranged at the output end of the second servo motor, the second driven belt pulley is arranged on the second rotating shaft, and the second belt is wound on the second driving belt pulley and the second driven belt pulley.

8. The three-servo constant tension output device as defined in claim 1, wherein: the rotating frame is provided with a steering guide wheel, and the core wire can bypass the steering guide wheel after being led out from the tension rod.

9. The three-servo constant tension output device as defined in claim 1, wherein: the wire outlet guide wheel is arranged on the rotating frame, the wire outlet guide wheel is positioned at the periphery of the wire coil, and the tension rod is positioned at the periphery of the wire outlet guide wheel.

10. A back-twist pay-off rack, characterized in that: the three-servo constant tension output device comprises a guide wheel support and the three-servo constant tension output device according to any one of claims 1 to 9, wherein the guide wheel support is fixed on the rotating frame and is positioned at the front end of the rotating frame, a first wire passing guide wheel and a second wire passing guide wheel are pivoted on the guide wheel support, the first wire passing guide wheel is arranged on the periphery of the guide wheel support, the second wire passing guide wheel is arranged in the middle of the guide wheel support, and a core wire can be led out along the central axis direction of the guide wheel support after bypassing the first wire passing guide wheel and the second wire passing guide wheel.