Double-end stranding machine and control method thereof

Abstract

The invention relates to the technical field of cable processing equipment, in particular to a double-end stranding machine and a control method thereof, and the double-end stranding machine comprises a first wire clamping and rotating mechanism; the second wire clamping rotating mechanism is arranged opposite to the first wire clamping rotating mechanism, and the first wire clamping rotating mechanism and the second wire clamping rotating mechanism are each provided with a wire clamping assembly and a rotating driving piece used for driving the wire clamping assembly to rotate; the wire pulling mechanism comprises a track arranged in the connecting direction of the first wire clamping rotating mechanism and the second wire clamping rotating mechanism, a synchronous belt parallel to the track and a wire pulling driving piece connected with the synchronous belt; wherein the second wire clamping rotating mechanism is connected with one side of the synchronous belt and can be arranged on the track in a relative sliding mode, the wire pulling driving piece is a servo motor, the wire pulling driving piece drives the synchronous belt to move in a torque mode, and when the wire pulling driving piece detects that the torque of the wire pulling driving piece is larger than a set value, the wire pulling driving piece stops moving. Through the arrangement, the wire stranding machine can adapt to wire stranding processing of wire harnesses with various lengths.

Description

Technical Field

[0001] The present invention relates to the technical field of cable processing equipment, and in particular to a double-headed twisting machine and a control method thereof. Background Art

[0002] A stranding machine is a piece of equipment used to twist multiple wires (usually copper or aluminum) together to form a composite wire. The stranding process improves the mechanical strength, flexibility, and electrical properties of the wire, making it suitable for a variety of applications such as cables, wire harnesses, and electrical connection systems.

[0003] In the related technology, for example, the Chinese utility model patent with publication number CN207938385U disclosed a double-head single-power twisting machine on October 2, 2018. In order to solve the problem that the twisting machine in the prior art is easy to loosen and shake during the operation of the equipment, the movable chuck of the two relatively arranged chucks is fixed, and the static chuck is set on the slide, and the slide is on the track of the frame. The static chuck is used to clamp one end of the wire harness, and the dynamic chuck is used to clamp the other end of the wire harness and rotate to achieve the twisting of the wire harness.

[0004] However, the above-mentioned double-head single-power stranding machine is only suitable for stranding wire harnesses of a single length when stranding wire harnesses. Once the wire harnesses of different lengths are changed for stranding, it is necessary to first adjust the distance between the dynamic clamp and the static clamp to a distance suitable for the wire harness with twisted wires, and then strand the wire harness. The efficiency and accuracy of switching and adjusting the length are low. Summary of the invention

[0005] In view of at least one of the above technical problems, the present invention provides a double-headed wire twisting machine and a control method thereof, which adopts structural improvement to improve the adaptability of the wire twisting machine.

[0006] According to a first aspect of the present invention, there is provided a double-headed stranding machine, comprising: A first thread clamping rotating mechanism; A second thread clamping rotating mechanism is arranged opposite to the first thread clamping rotating mechanism, and both the first thread clamping rotating mechanism and the second thread clamping rotating mechanism have a thread clamping assembly and a rotating driving member connected to the thread clamping assembly for driving the thread clamping assembly to rotate; The wire pulling mechanism comprises a track arranged along the connecting direction of the first wire clamping rotating mechanism and the second wire clamping rotating mechanism, a synchronous belt arranged parallel to the track, and a wire pulling driving member connected to the synchronous belt; Among them, the second wire clamping rotation mechanism is connected to one side of the synchronous belt and can be relatively slidably arranged on the track. The wire pulling drive is a servo motor. The wire pulling drive adopts a torque mode to drive the movement of the synchronous belt. When the wire pulling drive detects that its torque is greater than a set value, the wire pulling drive stops moving to obtain a tightened wire.

[0007] In some embodiments of the present invention, the first wire clamping rotation mechanism and the second wire clamping rotation mechanism are close to each other in an initial state, and the distance between them is enlarged after clamping the two ends of the wire harness respectively.

[0008] In some embodiments of the present invention, the first thread clamping rotation mechanism is fixedly arranged, and the second thread clamping rotation mechanism approaches or moves away from the first thread clamping rotation mechanism.

[0009] In some embodiments of the present invention, the rotary drive members in the first thread clamping rotation mechanism and the second thread clamping rotation mechanism are servo motors, and the rotary drive members are driven in a constant torque mode.

[0010] In some embodiments of the present invention, the rotary drive members in the first thread clamping rotation mechanism and the second thread clamping rotation mechanism are connected to a controller, and the controller controls the two rotary drive members to rotate synchronously.

[0011] In some embodiments of the present invention, the controller further comprises a control panel for inputting twisting wire parameters.

[0012] In some embodiments of the present invention, the wire clamping assembly includes a bearing seat, a hollow shaft rotatably connected to the bearing seat, a drive shaft axially movable in the hollow shaft, two clamping arms rotatably connected in the middle and rotatably connected to the drive shaft at the other end, and a clamping drive member for controlling the axial movement of the drive shaft; Wherein, the hollow rotating shaft is connected to the rotating driving member, the clamping driving member is rotationally connected to the driving shaft, and the driving shaft rotates synchronously with the hollow rotating shaft.

[0013] In some embodiments of the present invention, the wire clamping assembly also includes a wire clamping frame, which is fixed to the end of the hollow rotating shaft, and the middle part of the clamping arm is rotatably connected to the wire clamping frame. The wire clamping frame has a wire release groove for placing the wire harness, and the two clamping arms clamp the wire harness at the wire release groove.

[0014] In some embodiments of the present invention, the wire clamping frame further comprises a reserved groove extending in a direction away from the wire placing groove, a slidable locking block is provided in the reserved groove, and scales are provided on both sides of the reserved groove.

[0015] According to a second aspect of the present invention, there is also provided a control method for the double-headed twisting machine described in any one of the first aspects, comprising the following steps: Obtain the wire lay length information of the wire harness to be processed; Detecting the action of the wire clamping assembly, and when detecting that the wire clamping assembly is closed, driving the second wire clamping rotating mechanism away from the first wire clamping rotating mechanism; Detecting the torque on the wire-pulling driving member, and stopping the movement of the second wire clamping rotating mechanism when the torque on the wire-pulling driving member is greater than a set value; Acquire the moving distance of the second wire clamping rotating mechanism, and synchronously drive the two rotating driving members to rotate a set number of turns in a constant torque mode according to the acquired wire lay length information; Drive the two wire clamping components to open and complete the wire twisting operation of the wire harness.

[0016] The beneficial effects of the present invention are as follows: the present invention sets the wire pulling driving member that drives the second wire clamping rotating mechanism away from the first wire clamping rotating mechanism as a servo motor, and sets the servo motor to a torque mode. When the second wire clamping rotating mechanism is driven away from the first wire clamping rotating mechanism, the action of the wire pulling driving member is stopped when it is detected that the torque of the wire pulling driving member is greater than a set value. Compared with the prior art, there is no need to adjust the length of the wire harness. Automatic wire twisting processing of wire harnesses of various lengths can be achieved only according to the set twist pitch and the moving distance of the second wire clamping rotating mechanism. Compared with the prior art, the adaptability of the wire twisting machine is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a double-headed stranding machine in an embodiment of the present invention; Figure 2 It is a front view of a double-headed stranding machine in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the second wire clamping rotation mechanism in an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a wire pulling mechanism in an embodiment of the present invention; Figure 5 It is a structural schematic diagram of the first wire clamping rotation mechanism in an embodiment of the present invention; Figure 6 A schematic diagram of a cross-sectional structure of a bearing seat and its interior in an embodiment of the present invention; Figure 7 In the embodiment of the present invention Figure 5 A local enlarged view of point A in FIG. Figure 8 It is a flow chart of the steps of the double-head twisting machine control method in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] like Figures 1 to 7 The double-headed wire twisting machine shown in the figure comprises a first wire clamping rotating mechanism 1, a second wire clamping rotating mechanism 2 and a wire pulling mechanism 3, as shown in FIG. Figure 2 As shown in , the second clamping rotation mechanism 2 is arranged opposite to the first clamping rotation mechanism 1, and both the first clamping rotation mechanism 1 and the second clamping rotation mechanism 2 have a clamping assembly 11 and a rotating driving member 12 connected to the clamping assembly 11 for driving the clamping assembly 11 to rotate; Figure 3 As shown in FIG. 1 , the clamping assembly 11 is used to clamp the ends of the twisted pair, and the rotary drive member 12 is used to drive the clamping assembly to rotate. In the embodiment of the present invention, the first clamping rotating mechanism 1 and the second clamping rotating mechanism 2 both rotate the wire harness to improve the processing efficiency. Figure 4As shown in, in an embodiment of the present invention, the wire pulling mechanism 3 includes a track 31 arranged along the connecting direction of the first wire clamping rotating mechanism 1 and the second wire clamping rotating mechanism 2, a synchronous belt 32 arranged parallel to the track 31, and a wire pulling drive 33 connected to the synchronous belt 32; in an embodiment of the present invention, one end of the synchronous belt 32 can be rotatably connected by a synchronous wheel, and the wire pulling drive 33 is also rotatably connected to the synchronous belt 32 by a synchronous wheel. The track 31 can be arranged in the middle of the synchronous belt 32 or on both sides; specifically, the second wire clamping rotating mechanism 2 is connected to one side of the synchronous belt 32 and can be relatively slidably arranged on the track 31, the wire pulling drive 33 is a servo motor, and the wire pulling drive 33 adopts a torque mode to drive the movement of the synchronous belt 32. When the wire pulling drive 33 detects that its torque is greater than the set value, the wire pulling drive 33 stops moving to obtain a tightened wire.

[0023] In an embodiment of the present invention, a servo motor is used to drive the rotation of the synchronous belt 32, and the synchronous belt 32 is used to drive the movement of the second wire clamping rotating mechanism 2. The torque mode means that the servo motor drives the synchronous belt 32 with a constant torque to drive the movement of the second wire clamping rotating mechanism 2. In some embodiments of the present invention, the torque is generally set at 1000 N•m. This force can drive the second wire clamping rotating mechanism 2 to move on the track 31. Ignoring the gravity of the wire itself, after clamping the wire harness at both ends, the wire pulling drive 33 drives the movement of the second wire clamping rotating mechanism 2 with a set torque. When the wire is tightened, the load of the wire pulling drive 33 will exceed the set force. When it is detected that the torque is greater than the set force, the servo motor will stop moving and tighten the wire harness. In addition, it should be pointed out here that in an embodiment of the present invention, the length of the currently tightened wire, that is, the actual twisted length, can also be obtained through the movement of the second wire clamping rotating drive mechanism, and then the number of turns required to reach the set twist length can be calculated to complete the processing of the twisted wire.

[0024] In the above embodiment, by setting the wire pulling drive member 33 that drives the second wire clamping rotating mechanism 2 away from the first wire clamping rotating mechanism 1 as a servo motor, and setting the servo motor to a torque mode, when the second wire clamping rotating mechanism 2 is driven away from the first wire clamping rotating mechanism 1, the action of the wire pulling drive member 33 is stopped when it is detected that the torque of the wire pulling drive member 33 is greater than the set value. Compared with the prior art, there is no need to adjust the length of the wire harness. Automatic wire twisting processing of wire harnesses of various lengths can be achieved only according to the set twist pitch and the moving distance of the second wire clamping rotating mechanism 2. Compared with the prior art, the adaptability of the wire twisting machine is improved.

[0025] Based on the above embodiments, in some embodiments of the present invention, Figure 2As shown in the figure, the first clamping rotating mechanism 1 and the second clamping rotating mechanism 2 are close to each other in the initial state, and the distance between them is enlarged after clamping the two ends of the wire harness respectively. The close proximity here means that the ends of the two clamping members are against each other. Through the setting of this structural form, when the second clamping rotating mechanism 2 clamps the wire harness away from the first clamping rotating mechanism 1 until the wire harness is tightened, the length of the wire harness can be known. The specific calculation method can determine the distance according to the number of rotations of the servo motor.

[0026] In some embodiments of the present invention, in order to further improve the stability of the wire pulling, the first wire clamping rotating mechanism 1 is fixedly arranged, and the second wire clamping rotating mechanism 2 moves closer to or away from the first wire clamping rotating mechanism 1. In addition, in some embodiments of the present invention, the rotating drive member 12 in the first wire clamping rotating mechanism 1 and the second wire clamping rotating mechanism 2 is a servo motor, and the rotating drive member 12 is driven in a constant torque mode. The constant torque mode means that the force of each rotation of the two rotating drive members 12 is constant, so as to ensure the accuracy of the wire bundle twisting.

[0027] In an embodiment of the present invention, the rotary drive members 12 in the first clamping rotating mechanism 1 and the second clamping rotating mechanism 2 are connected to a controller (not shown in the figure), and the controller controls the two rotary drive members 12 to rotate synchronously. When performing the twisting operation, the controller controls the two rotary drive members 12 to rotate synchronously in the same direction and in the opposite direction in equal proportion, because when the wire harness rotates forward on the twisting machine, each strand in the wire harness will be twisted, which will generate stress inside the wire harness material, and it will form an internal tension in one direction in the wire harness material. By performing a proportional reverse rotation immediately after the forward rotation, the stress in the wire harness will apply the same torque in the opposite direction, and this reverse rotation will offset a part of the previously formed stress, so that the stress inside the wire harness tends to balance; in an embodiment of the present invention, by rotating the wire harness forward and reverse in equal proportion, the stress on the wire is eliminated, so that the finished stranded wire will not shrink, and its precise twisting distance is guaranteed.

[0028] In an embodiment of the present invention, for ease of operation, the controller further includes a control panel (not shown in the figure) for inputting the twisted wire parameters. Through this form of setting, the twist pitch of the twisted wire can be adjusted as needed, and the controller determines the number of turns according to the length of the wire harness and the twist pitch.

[0029] In some embodiments of the present invention, a specific structure of the clamping assembly 11 is as follows: Figure 5 As shown in the figure, the clamping assembly 11 includes a bearing seat 11a, a hollow shaft 11b rotatably connected to the bearing seat 11a, a driving shaft 11c axially movable in the hollow shaft 11b, two clamping arms 11d rotatably connected in the middle and connected to the driving shaft 11c at the other end, and a clamping driving member 11e for controlling the axial movement of the driving shaft 11c; Figure 6 The bearing seat 11a is used to carry the hollow shaft 11b. The hollow shaft 11b can be rotatably arranged on the bearing seat 11a. Please refer to Figure 3 or Figure 5 In the embodiment of the present invention, the hollow shaft 11b can be driven to rotate by a synchronous belt; the hollow shaft 11b is connected to the rotating drive member 12, the clamping drive member 11e is rotationally connected to the drive shaft 11c, and the drive shaft 11c rotates synchronously with the hollow shaft 11b. In addition, the clamping drive member can be a linear drive member such as a cylinder. When the connection is made, the outer ring of the bearing can be connected to the cylinder, and the inner ring can be connected to the drive shaft 11c. In this way, the clamping arm 11d can be driven to clamp or release the wire, and the rotation of the clamping assembly 11 is not affected.

[0030] Alternatively, if Figure 7 As shown in , in order to facilitate the placement of the wire harness end, the wire clamping assembly 11 also includes a wire clamping frame 13, which is fixed to the end of the hollow shaft 11b, and the middle part of the clamping arm 11d is rotatably connected to the wire clamping frame 13. The wire clamping frame 13 has a wire release groove 13a for placing the wire harness, and the two clamping arms 11d clamp the wire harness at the wire release groove 13a. Figure 7 As shown in , when placing the wire harness, it is only necessary to place the wire harness end in the wire release groove 13a, and then the ends of the two clamping arms 11d are brought close to each other to clamp the wire harness end. This structural setting can prevent the wire harness from falling during placement; in addition, in order to further adjust the length of the cable end, in some embodiments of the present invention, the wire clamping frame 13 also has a reserved groove 13b extending in a direction away from the wire release groove 13a, and a slidable locking block 13c is provided in the reserved groove 13b, and scales are provided on both sides of the reserved groove 13b. The scale here can start from the outside of the wire release groove 13a, and then the position of the locking block 13c is adjusted according to the length requirement of the cable end, and this position is the distance at which the cable end does not participate in the twisting of the wires; the locking block 13c has a variety of structural forms, for example, it can be adjusted as follows Figure 7 The handle shown in the figure adjusts and locks the position of the locking block 13c by the support of the bolt. Through the arrangement of this structural form, the consistency of the two ends of the wiring harness can be improved.

[0031] In an embodiment of the present invention, a control method for the above-mentioned double-head twisting machine is also provided. Figure 8 As shown in , the following steps are included: S10: obtaining the lay length information of the wire harness to be processed; the acquisition here may be manually input through the control panel, or the lay length information may be pre-stored in the controller, and those skilled in the art may select it according to the needs.

[0032] S20: Detect the action of the wire clamping assembly 11. When it is detected that the wire clamping assembly 11 is closed, drive the second wire clamping rotating mechanism 2 away from the first wire clamping rotating mechanism 1. The action of the wire clamping assembly 11 can be detected by detecting the movement of the cylinder. Of course, those skilled in the art can also achieve this by setting a laser sensor in the wire release groove 13a.

[0033] S30: Detect the torque on the wire pulling drive 33. When the torque on the wire pulling drive 33 is greater than the set value, stop the movement of the second wire clamping rotating mechanism 2. At this time, the wire harness has been tightened, and the twisted wire length of the wire harness can also be obtained based on the moving distance of the second wire clamping rotating mechanism 2.

[0034] S40: Obtain the moving distance of the second wire clamping rotating mechanism 2, and synchronously drive the two rotating drive components 12 to rotate a set number of circles in a constant torque mode according to the obtained wire twisting pitch information; as described above, when rotating specifically, equal proportional forward and reverse rotations can be performed first to eliminate stress and avoid the wire from shrinking after the twisting is completed, and then normal twisting operations can be performed.

[0035] S50: Drive the two wire clamping assemblies 11 to open and complete the wire twisting operation of the wire harness. It should also be pointed out here that after each wire twisting is completed, the two wire clamping assemblies are arranged in a structure with the wire release groove 13a facing upward, so as to facilitate the placement of the wire harness next time. Through the above settings, the controller can automatically calculate the length of the twisted wire and execute the number of turns according to the twist pitch, and the double-head processing can not only improve the efficiency of the twisting wire, but also achieve the effect of eliminating stress. Compared with the prior art, it can adapt to the twisting processing tasks of various wire lengths, and the processing efficiency and accuracy are improved.

[0036] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A double-end stranding machine, characterized in that: include: A first thread clamping rotating mechanism; A second thread clamping rotating mechanism is arranged opposite to the first thread clamping rotating mechanism, and both the first thread clamping rotating mechanism and the second thread clamping rotating mechanism have a thread clamping assembly and a rotating driving member connected to the thread clamping assembly for driving the thread clamping assembly to rotate; The wire pulling mechanism comprises a track arranged along the connecting direction of the first wire clamping rotating mechanism and the second wire clamping rotating mechanism, a synchronous belt arranged parallel to the track, and a wire pulling driving member connected to the synchronous belt; Among them, the second wire clamping rotation mechanism is connected to one side of the synchronous belt and can be relatively slidably arranged on the track. The wire pulling drive is a servo motor. The wire pulling drive adopts a torque mode to drive the movement of the synchronous belt. When the wire pulling drive detects that its torque is greater than a set value, the wire pulling drive stops moving to obtain a tightened wire.

2. The double-end stranding machine according to claim 1, characterized in that: The first wire clamping rotating mechanism and the second wire clamping rotating mechanism are close to each other in an initial state, and the distance between them is enlarged after clamping the two ends of the wire harness respectively.

3. The double-end stranding machine according to claim 2, characterized in that: The first thread clamping rotating mechanism is fixedly arranged, and the second thread clamping rotating mechanism approaches or moves away from the first thread clamping rotating mechanism.

4. The double-end stranding machine according to claim 1, characterized in that: The rotary drive members in the first thread clamping rotating mechanism and the second thread clamping rotating mechanism are servo motors, and the rotary drive members are driven in a constant torque mode.

5. The double-end stranding machine according to claim 4, characterized in that: The rotary drive members in the first thread clamping rotating mechanism and the second thread clamping rotating mechanism are connected to a controller, and the controller controls the two rotary drive members to rotate synchronously.

6. The double-end stranding machine according to claim 5, characterized in that: The controller further comprises a control panel for inputting the stranding parameters.

7. The double-end stranding machine according to claim 1, characterized in that: The clamping assembly includes a bearing seat, a hollow shaft rotatably connected to the bearing seat, a drive shaft axially movable in the hollow shaft, two clamping arms rotatably connected in the middle and rotatably connected to the drive shaft at the other end, and a clamping drive member for controlling the axial movement of the drive shaft; Wherein, the hollow rotating shaft is connected to the rotating driving member, the clamping driving member is rotationally connected to the driving shaft, and the driving shaft rotates synchronously with the hollow rotating shaft.

8. The double-end stranding machine according to claim 7, characterized in that: The wire clamping assembly also includes a wire clamping frame, which is fixed to the end of the hollow rotating shaft. The middle part of the clamping arm is rotatably connected to the wire clamping frame. The wire clamping frame has a wire release groove for placing the wire harness, and the two clamping arms clamp the wire harness at the wire release groove.

9. The double-end stranding machine according to claim 8, characterized in that: The wire clamping frame also has a reserved groove extending in a direction away from the wire placing groove, a slidable locking block is provided in the reserved groove, and scales are provided on both sides of the reserved groove.

10. A control method for a double-end twisting machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: Obtain the wire lay length information of the wire harness to be processed; Detecting the action of the wire clamping assembly, and when detecting that the wire clamping assembly is closed, driving the second wire clamping rotating mechanism away from the first wire clamping rotating mechanism; Detecting the torque on the wire-pulling driving member, and stopping the movement of the second wire clamping rotating mechanism when the torque on the wire-pulling driving member is greater than a set value; Acquire the moving distance of the second wire clamping rotating mechanism, and synchronously drive the two rotating driving members to rotate a set number of turns in a constant torque mode according to the acquired wire lay length information; Drive the two wire clamping components to open and complete the wire twisting operation of the wire harness.

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