Multi-core wire stranding machine

Abstract

The invention discloses a multi-core-wire stranding machine which comprises a rack, a rotating support, a rotating shaft, a driving mechanism and at least two constant-tension pay-off devices. The constant-tension pay-off device is arranged on the rotating bracket and is used for paying off a core wire; the driving mechanism drives the rotating shaft and the rotating bracket to rotate; the constant-tension pay-off device comprises a frame and a pay-off reel, a pay-off servo motor, a roller, a flexible connecting piece, a rotary servo motor, a tension take-up wheel, a displacement detection assembly and a servo controller which are arranged in the frame, the output end of the pay-off servo motor is connected with a rotary shaft of the pay-off reel, and the roller is arranged on the frame in a linear moving mode; an output shaft of the rotary servo motor is connected with the tension coiling wheel; the displacement detection assembly detects the rotation angle of the output shaft of the rotary servo motor or detects the displacement of the roller. The core wire pay-off tension of the stranding machine can be automatically controlled, so that the tension and the linear speed of a cable are kept constant, digital and intelligent production is realized, and the production efficiency and the quality of the cable are effectively improved.

Description

Technical Field

[0001] The present invention relates to intelligent cable manufacturing equipment, in particular to a multi-core wire stranding machine. Background Art

[0002] In the field of wire and cable manufacturing, there is a type of equipment called a stranding machine, which generally includes a pay-off machine, a stranding machine, a wrapping machine, and a take-up machine. When producing wire, the pay-off machine delivers the center wire to the center of the stranding machine. The stranding machine then releases multiple core wires, which are twisted together with the center wire to form a stranded wire. The wrapping machine then releases a tape to wrap the stranded wire to form a cable. Finally, the cable is wound and unloaded by the take-up machine. However, in the process of paying out the core wire from the existing stranding machine, as the core wire on the reel is continuously paid out, the core wire radius of the reel becomes smaller and smaller, and the length of the core wire released with each rotation of the reel becomes shorter and shorter. If the speed of the pay-off motor is not adjusted in time, the pay-off tension of the core wire will be affected, which in turn affects the pay-off stability, affecting the stranding of the core wire and the subsequent wrapping. In order to ensure more stable output of the core wire, it is necessary to adjust the pay-off speed of the reel in a timely manner to keep the pay-off tension of the core wire constant to improve the twisting and wrapping quality of the cable. Summary of the Invention

[0003] The purpose of the present invention is to provide a multi-core wire stranding machine, which can automatically control the tension of the core wire pay-off, so that the tension and line speed of the cable remain constant, realize digital and intelligent production, and effectively improve production efficiency and cable quality.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a multi-core wire twisting machine including a frame, a rotating bracket, a rotating shaft, a driving mechanism and at least two constant tension wire-releasing devices; the constant tension wire-releasing devices are evenly distributed on the rotating bracket around the central axis of the rotating bracket; the rotating bracket is coaxially fixed to the rotating shaft; the rotating shaft is transversely arranged on the frame, and the rotating shaft is provided with a center hole passing through both ends along its center axis, and the center line passes through the center hole; the rotating shaft is provided with a channel corresponding to the constant tension wire-releasing device one by one and deviating from the center hole, and the constant tension wire-releasing device releases the core wire so that the core wire passes through the channel and approaches the center line; the driving mechanism is arranged on the frame and drives the rotating shaft and the rotating bracket to rotate so that the core wire is twisted with the center line; the constant tension wire-releasing device includes a frame and a wire-releasing disk, a wire-releasing servo motor, The apparatus comprises a roller, a flexible connector, a rotary servo motor, a tension take-up wheel, a displacement detection assembly, and a servo controller. The pay-off drum is pivotally connected to the frame. The output end of the pay-off servo motor is connected to the rotating shaft of the pay-off drum to drive the pay-off drum to rotate and pay out the core wire. The roller rotates around a central axis, and the central axis is linearly movable on the frame. The core wire is paid out after passing around the roller. One end of the flexible connector is connected to the central axis of the roller, and the other end of the flexible connector is eccentrically connected to the tension take-up wheel. The output shaft of the rotary servo motor is connected to the tension take-up wheel to output torque to the tension take-up wheel, thereby pulling the roller through the flexible connector to provide tension to the core wire. The displacement detection assembly detects the rotation angle of the output shaft of the rotary servo motor or detects the displacement of the roller, thereby controlling the output speed of the pay-off servo motor through the servo controller. The displacement detection assembly, the rotary servo motor, and the pay-off servo motor are each electrically connected to the servo controller.

[0005] Compared to the prior art, the present invention employs at least two constant-tension pay-off devices mounted on a rotating support. These devices are equipped with a pay-off servo motor, rollers, a flexible connector, a rotary servo motor, and a tension take-up wheel. The core wire is released by wrapping it around the rollers. The flexible connector connects the rollers and the tension take-up wheel, and the rotary servo motor outputs a torque to the tension take-up wheel, generating a constant tension between the rollers and the tension take-up wheel. Furthermore, a displacement detection assembly is provided to automatically detect the rotation angle of the output shaft of the rotary servo motor or the displacement of the roller. Upon detecting a change in the output shaft rotation angle or the position of the roller, a servo controller adjusts the speed of the pay-off servo motor, thereby automatically adjusting the core wire's linear speed. This achieves automatic control of the core wire tension and maintains constant wire tension and travel speed. The entire process requires only setting the output torque of the rotary servo motor via the servo controller and monitoring and providing feedback using the displacement detection assembly in conjunction with the servo controller. Therefore, this solution can digitally adjust and set parameters of the rotary servo motor, displacement detection component and servo controller, which is conducive to realizing digital and intelligent production, effectively improving production efficiency and improving the quality of cables.

[0006] Preferably, the displacement detection component is an angular displacement sensor.

[0007] Specifically, the angular displacement sensor is an absolute encoder, which is provided on the tail of the output shaft of the rotary servo motor and electrically connected to the servo controller to detect the rotation angle of the output shaft of the rotary servo motor.

[0008] Preferably, the displacement detection component is a linear displacement sensor.

[0009] Specifically, the linear displacement sensor includes a Hall effect sensor and a sensing plate. The Hall effect sensor is mounted on the frame and electrically connected to the servo controller. The sensing plate is connected to the central axis and equipped with a magnet. The Hall effect sensor detects the position of the sensing plate. By providing the position sensor and sensing plate, the displacement of the roller can be detected, allowing the servo controller to automatically adjust the speed of the payout servo motor, thereby automatically controlling the core wire tension and payout speed, and maintaining constant wire tension and travel speed.

[0010] Specifically, a transmission mechanism is provided between the pay-off servo motor and the rotating shaft of the pay-off reel. By providing the transmission mechanism, the transmission mechanism can reduce the output speed of the pay-off servo motor, thereby adapting to the pay-off speed of the pay-off reel.

[0011] Specifically, the transmission mechanism includes a driving pulley, a driven pulley and a transmission belt. The driving pulley is connected to the output end of the pay-off servo motor, the driven pulley is connected to one end of the rotating shaft of the pay-off reel, and the transmission belt is respectively wrapped around the driving pulley and the driven pulley.

[0012] Specifically, the frame is equipped with two parallel and spaced-apart guide rails. The ends of the central axis are connected to sleeves that slide onto the guide rails. The guide rails allow the roller to slide along them, achieving position adjustment. Simultaneously, the flexible connector drives the tension take-up wheel, which in turn drives the output shaft of the rotary servo motor, rotating it to a certain angle for detection by the absolute encoder, achieving constant tension output.

[0013] Specifically, the constant tension pay-off device further includes a connecting frame, one end of which is fixedly connected to one end of the central axis, and the other end of which is fixedly connected to the other end of the central axis. The flexible connector is connected to the middle of the connecting frame. By arranging the connecting frame, the flexible connector is located in the middle of the roller and directly opposite the tension take-up wheel, thereby achieving force balance and improving the stability of the device operation.

[0014] Specifically, the constant tension pay-off device further includes a guide wheel, which is pivotally connected to the frame and located between the pay-off drum and the roller. The core wire is output around the guide wheel after passing through the roller.

[0015] Specifically, a mounting bracket is provided on the outside of the frame, and the servo controller is mounted on the mounting bracket. This allows the servo controller to rotate with the rotation of the frame, simplifies the connection, avoids the servo controller being placed outside the rotating bracket, simplifies the connection structure, and provides very stable control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the multi-core stranded wire wrapping machine of the present invention.

[0017] Figure 2 It is a top view of the multi-core stranded wire wrapping machine of the present invention.

[0018] Figure 3 It is a structural diagram of a multi-core wire stranding machine of the present invention.

[0019] Figure 4 It is a side view of the multi-core wire stranding machine of the multi-core wire stranding wrapping machine of the present invention.

[0020] Figure 5 It is a structural diagram of the constant tension pay-off device of the multi-core wire stranding machine of the present invention.

[0021] Figure 6 It is a top view of the constant tension pay-off device of the multi-core wire stranding machine of the present invention.

[0022] Figure 7 Schematic diagram of electrical connections of modules of the multi-core wire stranding machine of the present invention.

[0023] Figure 8 It is a structural diagram of another embodiment of the constant tension pay-off device of the multi-core wire stranding machine of the present invention. DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0025] See also Figure 1 、 Figure 2 and Figure 7 The present invention discloses a multi-core stranded wire wrapping machine 100, comprising a center wire pay-off machine (not shown in the figure), a multi-core stranded wire machine 1, a forming die 2, a wrapping device 3, a double-wheel take-up device 4, a take-up machine 5, and a control system 6, which are arranged in sequence. The center wire pay-off machine pays out a center wire 200 to the multi-core stranded wire machine 1, and the multi-core stranded wire machine 1 pays out a plurality of core wires 300 and twists the core wires with the center wire 200 to form stranded wires. The wrapping device 3 pays out a wrapping tape and wraps the stranded wires to form a cable, and the take-up machine 5 takes up the cable. The forming die 2 is arranged between the multi-core stranded wire machine 1 and the wrapping device 3, and the stranded wire passes through the forming die 2. The double-wheel take-up device 4 is arranged between the wrapping device 3 and the take-up machine 5, and the cable is respectively wound on the two take-up wheels of the double-wheel take-up device 4. The center wire pay-off machine, the multi-core wire stranding machine 1 , the wrapping device 3 and the take-up machine 5 are respectively connected to the control system 6 for communication, and signals can be transmitted to each other through wireless connection, for example.

[0026] See also Figure 3 and Figure 4The multi-core wire stranding machine 1 includes a frame 11, a rotating bracket 12, a rotating shaft 13, a driving mechanism 14 and at least two constant tension pay-off devices 15; the number of the constant tension pay-off devices 15 described in this embodiment is four; the four constant tension pay-off devices 15 are evenly distributed on the rotating bracket 12 around the central axis of the rotating bracket 12, and the structures of the four constant tension pay-off devices 15 are the same. The rotating bracket 12 is coaxially fixed to the rotating shaft 13. The rotating shaft 13 is transversely arranged on the frame 11 and is rotatably arranged on the frame 11 at both ends through bearings. The rotating shaft 13 is provided with a center hole 131 passing through both ends along its center axis, and the center line 200 passes through the center hole 131. The rotating shaft 13 is provided with channels 132 corresponding one to one with the constant tension pay-off devices 15 and offset from the center hole 131. Each constant tension pay-off device 15 simultaneously pays out a core wire 300, causing each core wire 300 to pass through each channel 132 and finally exit from an outlet and approach the center wire 200. The driving mechanism 14 is disposed on the frame 11 and drives the rotating shaft 13 and the rotating bracket 12 to rotate, so that all the core wires 300 are twisted with the center wire 200.

[0027] For example Figure 4 As shown, the driving mechanism 14 includes a motor 141, a first driving pulley 142, a first driven pulley 143 and a first belt 144. The motor 141 is arranged on the frame 11, the first driving pulley 142 is connected to the output end of the motor 141, the first driven pulley 143 is connected to the rotating shaft 13, and the first belt 144 is wrapped around the first driving pulley and the first driven pulley 143.

[0028] See also Figures 5 to 7The constant tension pay-off device 15 includes a frame 151 and a pay-off drum 152, a pay-off servo motor 153, a roller 154, a flexible connector 155, a rotary servo motor 156, a tension take-up wheel 157, a displacement detection component and a servo controller 159 arranged in the frame 151. The displacement detection component in this embodiment is an angular displacement sensor, specifically, the angular displacement sensor is an absolute encoder 158. The frame 151 is an elongated structure, and its two ends are respectively fixedly connected to the rotating bracket 12. The pay-off drum 152 is pivotally connected to the frame 151, and the output end of the pay-off servo motor 153 is connected to the rotating shaft 1521 of the pay-off drum 152 to drive the pay-off drum 152 to rotate and pay out the core wire 300. The rotating shaft 1521 of the pay-off drum 152 is perpendicular to the central axis of the center hole 131. The roller 154 rotates around a central axis 1541, which is linearly and movably mounted on the frame 151. The central axis of the central axis 1541 is perpendicular to the central axis of the center hole 131. The core wire is fed in a direction opposite to the feeding direction of the center wire 200. After passing around the roller 154 from the outside, it is released from the inside in the same direction as the feeding direction of the center wire 200 and enters the channel 132. One end of the flexible connector 155 is connected to the central axis 1541 of the roller 154, and the other end of the flexible connector 155 is eccentrically connected to the tension take-up wheel 157; the flexible connector 155 is a steel wire rope. The output shaft of the rotary servo motor 156 is connected to the tension take-up wheel 157 to output torque to the tension take-up wheel 157, thereby pulling the roller 154 through the flexible connector 155 to provide tension to the core wire. The absolute encoder 158 is mounted on the tail of the output shaft of the rotary servo motor 156 and is electrically connected to the servo controller to detect the rotation angle of the output shaft of the rotary servo motor 156. The absolute encoder 158, the rotary servo motor 156, and the pay-off servo motor 153 are each electrically connected to the servo controller 159. Specifically, the absolute encoder 158 can detect the rotation angle of the output shaft of the rotary servo motor 156. Half of this angle can be defined on the absolute encoder 158 as the origin of the output shaft, i.e., the zero-point angle. Clockwise rotation from the zero-point angle is set as positive. When the absolute encoder 158 detects that the output shaft has rotated to this angle, it outputs a positive value. Counterclockwise rotation from the zero-point angle is set as negative. When the absolute encoder 158 detects that the output shaft has rotated to this angle, it outputs a negative value. This positive or negative value is then fed back to the servo controller 159. The servo controller 159 is communicatively connected to the control system 6. In this embodiment, the angular displacement sensor may also be an angular displacement sensor of other known forms, such as an inductive angular displacement sensor, a potentiometer angular displacement sensor, an incremental encoder, etc.

[0029] like Figure 8 As shown, in another embodiment, the displacement detection component is a linear displacement sensor. Specifically, the linear displacement sensor includes a Hall sensor 160 and a sensing plate 161. The Hall sensor 160 is disposed on the frame 151 and is electrically connected to the servo controller 159. The sensing plate 161 is connected to the central axis 1541 and is provided with a magnet. The sensing plate 161 has an inductive slope, and the magnet is disposed on the inductive slope. The distance between each point on the inductive slope and the Hall sensor 160 gradually changes. Specifically, the distance between the two gradually decreases along the moving direction of the roller 154 approaching the pay-off reel 152. The Hall sensor 160 detects the position of the sensing plate 161. Specifically, the roller 154 moves a certain amount of displacement, and half of this displacement can be defined as the origin of the roller 154, that is, the 0-point position. The 0-point position is set as positive on the side close to the pay-off reel 152, and the Hall sensor 160 detects that the roller 154 is at this position, which is a positive value. The opposite side of the 0-point position is set as negative, and the Hall sensor 160 detects that the roller 154 is at this position, which is a negative value. This positive or negative value is then fed back to the servo controller 159. By providing the Hall sensor 160 and the sensor plate 161, the displacement of the roller 154 can be detected, and the speed of the pay-off servo motor 153 can be automatically adjusted by the servo controller 159, thereby achieving automatic control of the tension of the core wire and the pay-off line speed, and maintaining the wire tension and wire moving speed constant. Of course, the linear displacement sensor can also adopt other known forms of linear displacement sensors, such as inductive linear displacement sensors, capacitive linear displacement sensors, etc.

[0030] For example Figure 5 and Figure 6 As shown, a transmission mechanism 162 is provided between the pay-off servo motor 153 and the rotating shaft of the pay-off reel 152. By providing the transmission mechanism 162, the transmission mechanism 162 can reduce the output speed of the pay-off servo motor 153, thereby adapting the pay-off speed of the pay-off reel 152. Specifically, the transmission mechanism 162 includes a second driving pulley 1621, a second driven pulley 1622 and a transmission belt 1623. The second driving pulley 1621 is connected to the output end of the pay-off servo motor 153, the second driven pulley 1622 is connected to one end of the rotating shaft of the pay-off reel 152, and the transmission belt 1623 is respectively wrapped around the second driving pulley 1621 and the second driven pulley 1622.

[0031] See also Figure 5 and Figure 6The frame 151 is provided with two parallel and spaced-apart guide rails 1511. The ends of the central axis 1541 are connected to sleeves 1542, which slide onto the two guide rails 1511. The guide rails 1511 are cylindrical polished rods, and the sleeves 1542 are linear bearings. The guide rails 1511 allow the roller 154 to slide along them, adjusting its position. Simultaneously, the flexible connector 155 drives the tension take-up wheel 157, which in turn drives the output shaft of the rotary servo motor 156, rotating it to a certain angle for detection by the belt absolute encoder 158, thereby achieving constant tension output.

[0032] See also Figure 5 and Figure 6 The constant tension pay-off device 15 further includes a connecting frame 163, one end of which is fixedly connected to one end of the central axis 1541, and the other end of which is fixedly connected to the other end of the central axis 1541. The flexible connector 155 is connected to the middle of the connecting frame 163. The connecting frame 16 is a U-shaped rod. By providing the connecting frame 163, the connection point of the flexible connector 155 is positioned in the middle of the roller 154 and directly opposite the tension take-up wheel 157, thereby achieving force balance and improving the stability of the equipment operation.

[0033] See also Figure 5 and Figure 6 The constant tension pay-off device 15 also includes a guide wheel 164, which is pivotally connected to the frame 151 and located between the pay-off disk 152 and the roller 154. In addition, the guide wheel 164 is located on the inner side of the frame 151 close to the rotating bracket 12. The core wire 300 passes around the roller 154 and then around the guide wheel 164 before entering the channel 132.

[0034] For example Figure 5 As shown, a mounting bracket 1512 is provided on one side of the middle portion of the frame 151, and the servo controller 159 is mounted on the mounting bracket 1512. This allows the servo controller 159 to rotate along with the rotation of the frame 151, simplifies the connection, avoids the servo controller 159 being disposed outside the rotating bracket 12, simplifies the connection structure, and provides very stable control.

[0035] For example Figure 5 As shown, a counterweight wheel 1522 is provided at one end of the rotating shaft 1521 away from the second driven pulley 1622. This allows the pay-off drum 152 to be evenly stressed, thereby reducing vibration and extending the service life of the rotating shaft of the pay-off drum 152.

[0036] Combining the above and Figure 1 and Figure 2 The working principle of the multi-core stranded wire wrapping machine 100 of the present invention is described in detail below: First, the preliminary threading is carried out before work. Specifically, the center line 200 of the center line pay-off machine is passed through the center hole 131 of the multi-core wire stranding machine 1, the forming die 2, the wrapping device 3, the double-wheel drawing device 4 and the take-up machine 5 in sequence. At the same time, each constant tension pay-off device 15 on the multi-core wire stranding machine 1 releases a section of core wire 300, so that these core wires 300 pass through the center hole 131 of the multi-core wire stranding machine 1 and the forming die 2, the wrapping device 3, the double-wheel drawing device 4 to be twisted with the center line 200 to form a section of cable, and finally the cable is taken up by the take-up machine 5. During operation, the control system 6 controls the centerline payoff machine, the multi-core stranding machine 1, the wrapping device 3, and the take-up machine 5 to start. The centerline payoff machine pays out the centerline 200, and the four constant tension pay-off devices 15 simultaneously pay out the core wires 300. At the same time, the drive mechanism 14 drives the rotating shaft 13 to rotate, thereby driving the rotating bracket 12 to rotate. During the rotation process, the four core wires 300 are paid out and converge with the centerline 200 at the forming die 2. Under the action of the rotation of the rotating bracket 12, the four core wires 300 are twisted together around the centerline 200 to form a stranded wire. Afterwards, the stranded wire moves forward through the center hole 131 of the wrapping device 3. At the same time, the wrapping device 3 pays out the tape. Driven by the rotating bracket 12 of the wrapping device 3, the tape rotates around the stranded wire and wraps around the outer surface of the stranded wire to form a cable. Then, the cable moves forward, is wound around the double-wheel drawing device 4, and is taken up by the take-up machine 5.

[0037] Furthermore, the constant tension pay-off device 15 operates as follows: the pay-off servo motor 153 and the rotary servo motor 156 are activated, with the rotary servo motor 156 outputting a constant torque and applying tension to the core wire via the tension take-up wheel 157 and the flexible connector 155. The pay-off servo motor 153 drives the pay-off drum 152 to rotate via the transmission mechanism 162. The pay-off drum 152 continuously pays out the core wire 300, which then winds around the roller 154 and guide wheel and enters the channel 132. Finally, it exits the channel 132 and converges near the center wire 200. As the pay-off drum 152 continuously pays out the core wire 300, the diameter of the core wire 300 on the pay-off drum 152 decreases with each turn. The length of the core wire per turn decreases, and the pay-off tension increases, thereby driving the roller 154 toward the pay-off drum 152. The roller 154 drives the tension take-up wheel 157 to rotate a certain angle through the flexible connector 155, and the tension take-up wheel 157 drives the output shaft of the rotary servo motor 156 to rotate a certain angle. At this time, the absolute encoder 158 detects the rotation of the output shaft and sends a positive signal to the servo controller 159 (in another embodiment, the Hall effect sensor 160 can detect the position of the roller 154 and send a positive signal to the servo controller 159). The servo controller 159 controls the pay-off servo motor 153 to increase the output speed, thereby increasing the speed of the pay-off reel 152 and accelerating the pay-off speed, ensuring that the pay-off speed tends to be consistent with the initial speed until the output shaft of the rotary servo motor 156 returns to its initial position. In this way, the tension of the core wire 300 and the pay-off speed are always maintained constant.

[0038] Compared with the prior art, the present invention provides at least two constant tension pay-off devices 15 on a rotating bracket 12, and provides a pay-off servo motor 153, a roller 154, a flexible connector 155, a rotary servo motor 156 and a tension take-up wheel 157 on the constant tension pay-off device 15. The core wire is paid out by wrapping it around the roller 154, and the flexible connector 155 is used to connect the roller 154 and the tension take-up wheel 157. The rotary servo motor 156 then outputs a torque to the tension take-up wheel 157, so that a constant tension is generated between the roller 154 and the tension take-up wheel 157. Furthermore, by setting an absolute value encoder 158 at the output end of the rotary servo motor 156, the absolute value encoder 158 is used to automatically detect the rotation angle of the output shaft of the rotary servo motor 156. When a change in the rotation angle of the output shaft is detected, the rotation speed of the pay-off servo motor 153 can be adjusted by the control system 6, thereby automatically adjusting the linear speed of the core wire 300, thereby achieving automatic control of the tension of the core wire 300 and keeping the wire tension and wire moving speed constant. The entire process only requires setting the output torque of the rotary servo motor 156 through the servo controller 159 and using the absolute value encoder 158 in combination with the servo controller 159 to monitor and provide feedback on the output shaft of the rotary servo motor 156. Therefore, this solution can digitally adjust and set parameters for the rotary servo motor 156 and the absolute value encoder 158, which is conducive to realizing digital and intelligent production, effectively improving production efficiency, and improving the quality of cables.

[0039] The above disclosure is merely a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made within the scope of the present invention are still within the scope of the present invention.

Claims

1. A multi-core wire stranding machine, characterized in that: The invention comprises a frame, a rotating support, a rotating shaft, a driving mechanism and at least two constant tension pay-off devices; the constant tension pay-off devices are evenly distributed on the rotating support around the central axis of the rotating support; the rotating support is coaxially fixed to the rotating shaft; the rotating shaft is transversely arranged on the frame, and the rotating shaft is provided with a center hole passing through both ends along its central axis, and the center line passes through the center hole; the rotating shaft is provided with a channel corresponding to the constant tension pay-off device and deviating from the center hole, and the constant tension pay-off device pays out the core wire so that the core wire passes through the channel and approaches the center line; the driving mechanism is arranged on the frame and drives the rotating shaft and the rotating support to rotate so that the core wire is twisted with the center line; The constant tension pay-off device includes a frame and a pay-off drum, a pay-off servo motor, a roller, a flexible connector, a rotary servo motor, a tension take-up wheel, a displacement detection component and a servo controller arranged in the frame. The pay-off drum is pivotally connected to the frame, and the output end of the pay-off servo motor is connected to the rotating shaft of the pay-off drum to drive the pay-off drum to rotate and pay out the core wire. The roller rotates around a central axis, and the central axis is arranged on the frame in a linear motion. The core wire is paid out after passing around the roller; one end of the flexible connector is connected to the central axis of the roller. The other end of the flexible connector is eccentrically connected to the tension take-up wheel; the output shaft of the rotary servo motor is connected to the tension take-up wheel to output torque to the tension take-up wheel, and then the roller is pulled by the flexible connector to provide tension for the core wire; the displacement detection component detects the rotation angle of the output shaft of the rotary servo motor or detects the displacement of the roller, and then controls the output speed of the pay-off servo motor through the servo controller; the displacement detection component, the rotary servo motor and the pay-off servo motor are electrically connected to the servo controller respectively.

2. The multi-core wire stranding machine according to claim 1, characterized in that: The displacement detection component is an angular displacement sensor, and the angular displacement sensor is an absolute value encoder. The absolute value encoder is arranged on the tail of the output shaft of the rotary servo motor and is electrically connected to the servo controller to detect the rotation angle of the output shaft of the rotary servo motor.

3. The multi-core wire stranding machine according to claim 1, characterized in that: The displacement detection component is a linear displacement sensor, which includes a Hall sensor and a sensing plate. The Hall sensor is arranged on the frame and electrically connected to the servo controller. The sensing plate is connected to the central axis and is provided with a magnet. The Hall sensor detects the position of the sensing plate.

4. The multi-core wire stranding machine according to claim 1, characterized in that: A transmission mechanism is provided between the pay-off servo motor and the rotating shaft of the pay-off reel.

5. The multi-core wire stranding machine according to claim 4, characterized in that: The transmission mechanism includes a second driving pulley, a second driven pulley and a transmission belt, the second driving pulley is connected to the output end of the pay-off servo motor, the second driven pulley is connected to one end of the rotating shaft of the pay-off disk, and the transmission belt is respectively wrapped around the second driving pulley and the second driven pulley.

6. The multi-core wire stranding machine according to claim 1, characterized in that: The frame is provided with two parallel and spaced guide rails. The two ends of the central axis are connected with sliding sleeves, and the sliding sleeves are slidably sleeved on the guide rails.

7. The multi-core wire stranding machine according to claim 1, characterized in that: The constant tension pay-off device also includes a connecting frame, one end of the connecting frame is fixedly connected to one end of the central axis, the other end of the connecting frame is fixedly connected to the other end of the central axis, and the flexible connector is connected to the middle of the connecting frame.

8. The multi-core wire stranding machine according to claim 1, characterized in that: The constant tension pay-off device further comprises a guide wheel, which is pivotally connected to the frame and is located between the pay-off disc and the roller. The core wire is wound around the roller and then around the guide wheel to be output.

9. The multi-core wire stranding machine according to claim 1, characterized in that: A mounting bracket is provided on the outer side of the frame, and the servo controller is mounted on the mounting bracket.

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