CN108074676B

CN108074676B - Device and method for fixing twisted pair cable lay length

Info

Publication number: CN108074676B
Application number: CN201611008147.0A
Authority: CN
Inventors: 黄冬莲
Original assignee: Anhui Lianjiaxiang Special Cable Co ltd
Current assignee: Anhui Lianjiaxiang Special Cable Co ltd
Priority date: 2016-11-16
Filing date: 2016-11-16
Publication date: 2022-08-02
Anticipated expiration: 2036-11-16
Also published as: CN108074676A; WO2018090954A1

Abstract

The invention discloses a device and a method for fixing the lay length of a twisted pair cable, wherein the device comprises a pay-off system for conveying two separable wires with sheaths; the ultrasonic plastic welding machine is used for welding a sheath of a lead conveyed by the pay-off system to form an inseparable cable; and the wire take-up system is used for twisting the cable according to a preset twisting pitch to form a twisted pair cable and rolling the twisted pair cable. The method comprises the steps of wire assembly, wire welding, twisted pair cable manufacturing and twisted pair cable rolling. The invention adopts an ultrasonic plastic welding machine to melt and weld the sheaths of the leads to form an inseparable cable, and further twists the cable according to the preset twist pitch to form a twisted pair cable, thereby ensuring that the twist pitch of the twisted pair is not changed in the using process, and two leads of the twisted pair are not subjected to the phenomena of local looseness and dislocation, thereby improving the quality of signal transmission.

Description

Device and method for fixing twisted pair cable lay length

Technical Field

The invention relates to the wire and cable technology, in particular to a device and a method for fixing the twisting pitch of a twisted pair cable.

Background

Twisted pair cables are widely used as power, particularly signal transmission elements in various electrical devices. In modern communication, sensing and control technologies, electromagnetic interference is ubiquitous in air and lines, and the interference seriously affects the quality of signal transmission, especially in microelectronic line transmission and long-distance transmission, and the electromagnetic interference causes signal distortion. The signal transmission line must have the necessary capability of shielding electromagnetic interference, and the prior art generally adopts twisted pair cable to overcome the above problem, i.e. twisting two insulated wires into a spiral shape to combine them together, so that the interference generated by the electromagnetic signals coming and going on the two wires is equal in magnitude and opposite in phase, further making the interference signals cancel each other.

However, in specific use, the twisted pair used for signal transmission is difficult to bend and twist, so the lay length of the twisted pair is difficult to change, and the two insulated wires are also difficult to loose and dislocate locally, so that external interference signals cannot be offset, and the signal transmission quality of the twisted pair cable cannot be guaranteed.

Therefore, there is a need for a new device and method for fixing the twist pitch of a twisted pair cable, which can ensure that the twist pitch of the twisted pair cable is not changed during the use process, and two wires of the twisted pair cable are not loosened and dislocated locally, so as to improve the quality of signal transmission.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides an apparatus and method for fixing a lay length of a twisted pair cable, which uses an ultrasonic plastic welding machine to melt and weld sheaths of wires to form an inseparable cable, and further twists the cable according to a predetermined lay length to form a twisted pair cable, thereby ensuring that the lay length of the twisted pair cable is not changed during use, and two wires of the twisted pair cable are not loosened and dislocated locally, thereby improving the quality of signal transmission.

The technical scheme provided by the invention for the technical problem is as follows:

in one aspect, an apparatus for fixing a lay length of a twisted pair cable is provided, comprising;

the paying-off system is used for conveying two separable wires with sheaths;

the ultrasonic plastic welding machine is used for welding a sheath of a conducting wire conveyed by the pay-off system to enable the two conducting wires to form an inseparable cable;

the wire take-up system is used for twisting the cable according to a preset twisting pitch to form a twisted pair cable and rolling the twisted pair cable;

and the control system is respectively connected with the pay-off system, the ultrasonic plastic welding machine and the take-up system and is used for controlling the operation of the pay-off system, the ultrasonic plastic welding machine and the take-up system.

Preferably, the pay-off system comprises:

a wire guide roller for winding two wires;

a damper provided on the wire guide roller for providing a predetermined damping so that the wire wound on the wire guide roller is uniformly paid out;

the wire twisting mechanism is arranged on one side of the wire guide roller, comprises a speed reducing motor and a speed reducing gear (222), and is used for driving the wire guide roller to rotate around the vertical central axis X of the wire guide roller at a constant speed;

and a tension wheel, which is arranged on the path of the lead wire conveyed to the ultrasonic plastic welding machine and is used for guiding the lead wire to the ultrasonic plastic welding machine.

Preferably, the ultrasonic plastic welding machine includes:

a column;

the ultrasonic generator is arranged on the upright post and is connected with the control system;

the handpiece comprises an energy converter and an amplitude transformer, the top end of the energy converter is connected with the ultrasonic generator, and the bottom end of the energy converter is connected with the top end of the amplitude transformer;

the mould is connected to the bottom end of the amplitude transformer and is used for providing a channel for fixing the two conducting wires and contacting the sheaths of the two conducting wires;

the workbench is arranged below the machine head and used for providing an operating platform for the welding operation;

the machine head lifting device is respectively connected with the machine head and the control system and is used for driving the machine head to move downwards so that the mold forms the channel, and when the two leads are fixed in the channel of the mold, pressure is applied to the mold so that the sheaths of the two leads are contacted; the control system is used for controlling the movement of the machine head lifting device and controlling the machine head lifting device to apply pressure to the die;

the control system is also used for controlling the ultrasonic generator to provide ultrasonic frequency alternating electric energy for the transducer, so that the transducer, the amplitude transformer and the die generate ultrasonic vibration, the two wires which are positioned on the workbench and fixed on the die vibrate relatively, high-frequency friction is generated at the contact position of the two sheaths, friction heat is generated, the sheaths of the two wires are melted and welded to form the cable, and the cable can pass through the channel and is conveyed to the take-up system.

Preferably, the mold is a continuous welding mold comprising:

the upper die body is fixed at the bottom end of the amplitude transformer and the lower die body is fixed on the workbench; the upper die body comprises an upper die base connected with the bottom end of the amplitude transformer, an upper die base hole is formed in the upper die base, and a driven roller is movably matched in the upper die base hole; the lower die body comprises a lower die base fixed on the workbench, a lower die base hole is formed in the lower die base, and a driving roller is movably matched in the lower die base hole;

the output shaft of the motor is connected with a driving gear, and the driving gear is meshed with a driven gear fixed on the driving roller shaft; the motor drives the driven gear to rotate by driving the driving gear to rotate, and the driving roller is driven to roll by the rotation of the driven gear;

initiative gyro wheel and driven gyro wheel periphery are equipped with the annular circular arc groove that the specification is the same, and the groove width matches with the wire respectively, just when annular circular arc groove position corresponds, two the wire is respectively, and partial card is established the annular circular arc groove of initiative gyro wheel and in the annular circular arc inslot of driven gyro wheel, and can follow two pass through in the passageway that forms between the annular circular arc groove, and enter into the receipts line system.

Preferably, the mold is an intermittent welding mold including:

the upper die is fixed at the bottom end of the amplitude transformer and the lower die is fixed on the workbench;

go up the mould and be equipped with the semicircle groove that the specification is the same, and the groove width matches with the wire on the lower mould respectively, just when semicircle groove position corresponds, two separable wire of taking the sheath is respectively, and the part card is established the semicircle groove of going up the mould and the semicircle inslot of lower mould, and can follow two pass through in the passageway that forms between the semicircle groove, and enter into receive the line system.

Preferably, the wire take-up system comprises:

the traction mechanism is used for forcing the cable formed after welding to be twisted according to a preset twist pitch and guiding the twisted pair cable formed after twisting to pass through;

the take-up roller assembly is used for rolling the twisted pair cable formed after welding;

and the untwisting mechanism is arranged on one side of the wire take-up roller and is used for releasing torsional stress generated in the twisting process of the cable.

Preferably, the traction mechanism includes:

a traction motor disposed downstream of the ultrasonic plastic welding machine;

a traction wheel connected with an output shaft of the traction motor;

the traction motor and the traction wheel are used for continuously pulling the cable out of the ultrasonic plastic welding machine at a stable speed;

and a guide wheel set comprising at least two pairs of twisted wire guide wheels and at least one pair of traction stressing wheels; the at least two pairs of twisted wire guide wheels are used for forcing the cable formed in the ultrasonic plastic welding machine to pass in a spiral line according to a preset twist pitch to form the twisted pair cable; the pair of traction stress application wheels are symmetrically arranged on two sides of the traction wheel respectively and used for increasing the wrap angle of the twisted-pair cable in contact with the traction wheel and the friction force between the twisted-pair cable and the traction wheel;

the take-up roller assembly comprises:

the wire take-up roller can rotate and can be used for winding the twisted-pair cable; the torque motor drives the wire take-up roller to rotate, the torque motor is connected with the control system, and the control system is connected and used for controlling the torque motor to operate;

the untwisting mechanism comprises:

the speed reducing motor is arranged on one side of the take-up roller; and a reduction gear connected with the reduction motor.

Preferably, the line receiving system further comprises:

the wiring mechanism is used for driving the wire collecting roller to move up and down along the vertical central axis Y of the wire collecting roller so as to uniformly and densely wind the twisted-pair cables on the wire collecting roller, and comprises:

the gear pair comprises a forward rotation driving gear and a forward rotation driven gear; the counter gear pair comprises a counter driving gear and a counter driven gear; the forward rotation driving gear and the reverse rotation driving gear are coaxially fixed at the top end and the bottom end of the rotating shaft of the take-up roller;

the reversing lead screw nut pair comprises a lead screw, and the lead of the lead screw is equal to the width of the twisted-pair cable; the top end and the bottom end of the screw rod are respectively connected with the forward driven gear and the reverse driven gear through sliding keys;

the two sets of reversing clutches respectively comprise jaw clutch discs, the jaw clutch discs are respectively connected with the top end and the bottom end of the lead screw, driving discs of the jaw clutch discs are respectively fixedly connected with the forward driven gear and the reverse driven gear, and driven discs of the jaw clutch discs are respectively coaxially and fixedly connected with the top end and the bottom end of the lead screw;

when the twisted pair cable winds the winding roller for a layer of the lifting, the lead screw pushes the reversing clutch to change connection, and the winding roller is driven to reversely move along the vertical central axis Y.

Preferably, the ultrasonic plastic welding machine further comprises:

the cooling system comprises a cooling liquid tank arranged on the workbench, and the cooling liquid tank is used for storing cooling liquid;

and the spray header is used for absorbing the cooling liquid stored in the cooling liquid tank and spraying the cooling liquid at the welding position of the two leads so as to cool and solidify the welding seam.

10. A method of maintaining a fixed lay length of a twisted pair cable, comprising the steps of:

s1, assembling a lead: winding two separable, sheathed wires around a payout system for conveying the wires;

s2, wire welding: conveying the lead to an ultrasonic plastic welding machine; the ultrasonic plastic welding machine is used for melting and welding the contact part of the sheaths of the two leads to form a continuous or discontinuous inseparable cable;

s3, manufacturing the twisted-pair cable: twisting the cable according to a preset twisting pitch by adopting a twisting guide wheel in a take-up system to form a twisted pair cable;

s4, winding twisted-pair cable: and winding the twisted pair cable on a take-up roller of the take-up system.

The technical effects brought by the technical scheme of the invention are as follows: the twisted-pair cable can effectively prevent the phenomena of twist pitch change, local looseness and dislocation of two lines in the using process of the twisted-pair cable, can completely offset electromagnetic interference and improves the signal transmission quality.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic front view of an apparatus for fixing a lay length of a twisted pair cable according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a wire releasing system according to an embodiment of the present invention;

fig. 3 is a schematic top view of an apparatus for fixing the lay length of a twisted pair cable according to one embodiment of the present invention;

FIG. 4 is a schematic view of an ultrasonic plastic welder in accordance with one embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a progressive welding die according to an embodiment of the present invention;

FIG. 6 is a schematic side view of a continuous welding mold of a wire twisting machine according to an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of an interrupted welding die according to an embodiment of the present invention;

FIG. 8 is a schematic side view of a welding mold according to an embodiment of the present invention;

FIG. 9 is an enlarged schematic view of a take-up system according to a first embodiment of the present invention;

fig. 10 is a flowchart of a method for fixing the lay length of a twisted pair cable according to a second embodiment of the present invention.

Detailed Description

The invention provides equipment and a method for fixing the twisted pair cable lay, aiming at the defects that the twisted pair cable lay is easy to change, the local parts of two leads are easy to loosen and misplace, so that the electromagnetic interference can not be completely counteracted, and the signal transmission quality can not be improved in the prior art.

The first embodiment is as follows:

fig. 1 provides a front view of an apparatus for fixing the lay length of a twisted pair cable, comprising:

a payout system 20 for delivering two separable jacketed conductors;

the ultrasonic plastic welding machine 10 is used for welding a sheath of a conducting wire conveyed by the pay-off system 20, so that the two conducting wires form an inseparable cable;

the wire take-up system 30 is used for twisting the cable according to a preset twisting pitch to form a twisted pair cable and rolling the twisted pair cable;

and the control system (not shown) is respectively connected with the wire releasing system 20, the ultrasonic plastic welding machine 10 and the wire collecting system 30 and is used for controlling the operation of the wire releasing system 20, the ultrasonic plastic welding machine 10 and the wire collecting system 30.

Further, as can be seen in connection with fig. 2-3, the payout system 20 comprises:

two wire guide rollers 21 around which two of the wires can be wound; the lead is provided with a sheath, and the sheath is made of polyethylene, polypropylene, polyvinyl chloride, nylon and other materials with good ultrasonic welding performance; each of the guide rollers 21 is provided with a damper 211 for providing a predetermined damping so that

The wire wound on the wire guide roller 21 is uniformly paid out;

the wire twisting mechanism 22 is arranged on one side of the wire guide roller 21, comprises a speed reducing motor 221 and a speed reducing gear 222, and is used for driving the wire guide roller 21 to rotate around the vertical central axis X of the wire guide roller 21 at a constant speed;

and a tension wheel 23 disposed on a path along which the wire is fed to the ultrasonic plastic welder 10 for guiding the wire to the ultrasonic plastic welder 10.

As shown in fig. 4, the ultrasonic plastic welding machine 10 includes:

a column 15;

an ultrasonic generator 14 mounted on the upright 15 and connected to the control system;

a handpiece 11 which comprises a transducer 111 and a horn 112, wherein the top end of the transducer 111 is connected with the ultrasonic generator 14, and the bottom end of the transducer is connected with the top end of the horn 112;

a die 12 attached to the bottom end of the horn 112 for lifting a channel that holds the two wires and brings the sheaths of the two wires into contact;

a workbench 13 arranged below the machine head 11 and used for providing an operation platform for the welding operation;

the machine head lifting device is respectively connected with the machine head 11 and the control system and is used for driving the machine head 11 to move downwards so that the die 12 forms the channel, and when the two leads are fixed in the channel of the die 12, pressure is applied to the die 12 so that the sheaths of the two leads are contacted; the control system is used for controlling the movement of the machine head lifting device and controlling the machine head lifting device to apply pressure to the mould 12;

meanwhile, the ultrasonic plastic welding machine 10 may further include:

a cooling system including a cooling liquid tank 352 disposed on the work table 13, the cooling liquid tank 352 being configured to store cooling liquid;

and a spray header 351 for sucking the cooling liquid stored in the cooling liquid tank 352 and spraying the cooling liquid at the welding position of the two wires to cool and solidify the welding seam.

As shown in fig. 1, the mold 12 is a continuous welding mold 12A, which can be seen in fig. 5 to 6, and specifically includes: an upper mold body 12A1 fixed at the bottom end of the amplitude transformer 112 and a lower mold body 12A2 fixed on the workbench 13; the upper die body 12a1 comprises an upper die base 12a11 connected with the bottom end of the amplitude transformer 112, an upper die base hole 121 is formed in the upper die base 12a11, and a driven roller 12a12 is movably matched in the upper die base hole 121; the lower die body 12a2 includes a lower die base 12a21 fixed on the workbench 13, a lower die base hole 122 is opened on the lower die base 12a21, and a driving roller 12a22 is movably matched in the lower die base hole 122;

the device also comprises a motor 12A23, an output shaft of which is connected with a driving gear 12A24, wherein the driving gear 12A24 is meshed with a driven gear 12A25 fixed on the shaft of the driving roller 12A 22; the motor 12a23 drives the driving gear 12a24 to rotate so as to drive the driven gear 12a25 to rotate, and the driven gear 12a25 rotates so as to drive the driving roller 12a22 to roll;

the peripheries of the driving roller 12A22 and the driven roller 12A12 are respectively provided with

annular arc grooves

123 and 124 with the same specification and the groove width matched with the wires, and when the positions of the

annular arc grooves

123 and 124 correspond, the wires are respectively and partially clamped in the annular arc groove 123 of the driving roller 12A22 and the annular arc groove 124 of the driven roller 12A12 and can pass through a channel formed between the two

annular arc grooves

123 and 124 and enter the take-up system 30.

The control system is used for controlling the ultrasonic generator 14 to provide ultrasonic frequency alternating electric energy for the transducer 111, so that the transducer 111, the amplitude transformer 112 and the die 12 generate ultrasonic vibration, and the two wires which are positioned on the worktable 13 and fixed on the die 12 vibrate relatively, and high-frequency friction is generated at the contact part of the two sheaths, so that friction heat is generated, the sheaths of the two wires are melted and welded to form the cable, and the cable can pass through the channel and is conveyed to the take-up system 30.

Specifically, when the die 12 is the intermittent welding die 12A, the wire take-up roller 31 of the wire take-up system 30 and the wire guide roller 21 of the wire pay-off system may continuously rotate under the control of the control system, and continuously move forward with the two wires. A head lifting device moves the head 11 downwards to close the upper die body 12a1 and the lower die body 12a2, the two circular arc grooves of the driving roller 12a22 and the driven roller 12a12 are close to each other and form an oblong passage through which two wires to be welded continuously pass, and the head lifting device continuously applies a certain pressure to the upper die body 12a1 so that the contact point of the two wires becomes a contact line. Further, the ultrasonic generator 14 continuously provides ultrasonic frequency alternating electric energy to the transducer 111, so that the transducer 111, the horn 112 and the upper die body 12a1 continuously generate ultrasonic vibration, thereby vibrating the two wires relatively to generate high-frequency friction continuously on the contact line of the two wires, generating a large amount of friction heat, melting the contact line of the plastic sheath of the wires, and further, the spray head 351 directly sprays the cooling liquid on the weld joint to enable the cooling liquid to be immediately solidified into a whole. The motor 12a23 continuously rotates the driving roller 12a22 via the driving gear 12a24 and the driven gear 12a25, so that the soldered wires continuously advance, and the contact wires between the two wires are continuously welded together to form an inseparable cable.

Preferably, the mold 12 may also be an intermittent welding mold 12B, as shown in fig. 7 to 8, which specifically includes:

an upper die 12B1 fixed at the bottom end of the horn 112 and a lower die 12B2 fixed on the table 13;

the upper die 12B1 and the lower die 12B2 are respectively provided with

semicircular grooves

125 and 126 which have the same specification and the groove width matched with the wires, and when the

semicircular grooves

125 and 126 correspond in position, the two separable wires with the sheath are respectively and partially clamped in the semicircular groove 125 of the upper die 12B1 and the semicircular groove 126 of the lower die 12B2, and can pass through a channel formed between the two

semicircular grooves

125 and 126 and enter the take-up system 30.

Further, as shown in fig. 1,2 and 9, the wire rewinding system 30 includes:

the traction mechanism 32 is used for forcing the cable formed after welding to be twisted according to a preset twist pitch and guiding the twisted pair cable formed after twisting to pass through;

and a releasing mechanism 33 disposed at one side of the wire take-up roller 31 for releasing torsional stress generated during twisting of the wire.

Wherein the pulling mechanism 32 comprises:

a traction motor 321 disposed downstream of the ultrasonic plastic welder 10;

a traction wheel 3211 connected to an output shaft of the traction motor 321;

the traction motor 321 and the traction wheel 3211 are used for continuously pulling the cable out of the ultrasonic plastic welding machine 10 at a stable speed;

and a guide wheel set 322 comprising at least two pairs of twisted wire guide wheels 3221 and at least one pair of traction stressing wheels 3222; the at least two pairs of twisted wire guide wheels 3221 are configured to force the cable formed in the ultrasonic plastic welding machine 10 to pass through in a spiral line according to a predetermined twisting pitch to form the twisted pair cable; the at least one pair of traction stress rollers 3222 are symmetrically disposed on two sides of the traction wheel 3211, and are configured to increase a wrap angle between the twisted pair cable and the traction wheel 3211 and a friction force therebetween;

the take-up roller assembly comprises:

a take-up roller 31 which is rotatable and around which the twisted pair cable is wound; the torque motor 34 drives the wire take-up roller 31 to rotate, the torque motor 34 is connected with the control system, and the control system is connected and used for controlling the torque motor 34 to operate;

the torque release mechanism 33 includes:

a reduction motor 331 provided on one side of the take-up roller 31; and a reduction gear 332 connected to the reduction motor 331.

The wire retrieving system 30 may further include:

the wiring mechanism 36 is configured to drive the take-up roller 31 to move up and down along the vertical central axis Y thereof, so as to uniformly and densely wind the twisted pair cables around the take-up roller 31, and includes:

a forward rotation gear pair 361 and a reverse rotation gear pair 362, the forward rotation gear pair 361 including a forward rotation drive gear 365 and a forward rotation driven gear 367; the counter gear pair 362 includes a counter drive gear 368 and a counter driven gear 369; the forward driving gear 365 and the reverse driving gear 368 are coaxially fixed at the top end and the bottom end of the rotating shaft of the take-up roller 31;

the reversing lead screw nut pair comprises a lead screw 363, and the lead of the lead screw 363 is equal to the width of the twisted-pair cable; the top end and the bottom end of the lead screw 363 are respectively connected with the forward rotation driven gear 367 and the reverse rotation driven gear 369 through sliding keys;

two sets of reversing clutches 364, each of which includes a dog clutch disc, the dog clutch discs are respectively connected to the top end and the bottom end of the lead screw 363, the driving discs of the dog clutch discs are respectively fixedly connected to the forward driven gear 367 and the reverse driven gear 369, and the driven discs of the dog clutch discs are respectively coaxially and fixedly connected to the top end and the bottom end of the lead screw 363;

when the twisted pair cable winds up to a layer corresponding to the winding-up roller 31, the lead screw 363 pushes the reversing clutch 364 to change over, so as to drive the winding-up roller 31 to move reversely along the vertical central axis Y.

When the die 12 is the intermittent welding die 12B, the wire take-up roller 31 of the wire take-up system 30 and the wire guide roller 21 of the wire pay-off system may intermittently rotate under the control of the control system for a certain period, and intermittently pause and intermittently move forward the two wires, the head lifting device moves the head 11 downward to make the upper die 12B1 and the lower die 12B2 approach, the semicircular groove 125 approaches the semicircular groove 126 and forms an oblong passage through which the two wires to be welded intermittently pass. When the wires are halted, handpiece lift means intermittently applies a pressure to upper die 12B1 such that the contact of two of the wires is a point of contact. The ultrasonic generator 14 provides ultrasonic frequency alternating electric energy to the transducer 111, so that the transducer 111, the horn 112 and the upper die 12B1 generate ultrasonic vibration, thereby generating high frequency friction at the contact point of the two wires, generating a large amount of friction heat, melting the contact point of the plastic sheath of the wire, further, the spray head 351 sprays cooling liquid directly on the weld joint, so that the cooling liquid is immediately solidified into a solidification point, and then the wire moves forward for a certain distance to enter the next welding point. Repeating the above steps, the contact positions of the two leads form uniform and discontinuous welding points to form an inseparable cable.

Moreover, the intermittent rotation of the take-up roller 31 and the guide roller 21, the intermittent pressure application of the handpiece lifting device and the intermittent supply of ultrasonic frequency alternating electric energy to the transducer 111 by the ultrasonic generator 14 are all strictly synchronous and are uniformly controlled by the control system.

Example two:

fig. 10 shows a method of keeping the lay length of a twisted pair cable fixed, comprising the steps of:

s3, manufacturing the twisted-pair cable: twisting the cable according to a preset twisting distance by adopting a twisting guide wheel in a take-up system to form a twisted-pair cable;

s4, winding of twisted pair cables: and winding the twisted pair cable on a take-up roller of the take-up system.

The structure and the function of the paying-off system, the ultrasonic plastic welding machine and the take-up system are the same as those of the first embodiment, and are not described in detail herein. In summary, in the apparatus and method for fixing the twisted pair cable lay length of the present invention, an ultrasonic plastic welding machine is used to melt and weld the sheaths of the wires to form an inseparable cable, and the cable is further twisted according to a predetermined lay length to form a twisted pair cable, so as to ensure that the twisted pair lay length is not changed during the use process, and two wires of the twisted pair are not loosened and dislocated locally, thereby improving the quality of signal transmission.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An apparatus for fixing the lay length of a twisted pair cable, comprising;

a payout system (20) for delivering two separable jacketed conductors;

the ultrasonic plastic welding machine (10) is used for welding a sheath of a conducting wire conveyed by the pay-off system (20) so that the two conducting wires form an inseparable cable;

and a take-up system (30) for twisting the cable according to a predetermined twisting pitch to form a twisted pair cable and taking up the twisted pair cable;

the control system is respectively connected with the pay-off system (20), the ultrasonic plastic welding machine (10) and the take-up system (30) and is used for controlling the operation of the pay-off system (20), the ultrasonic plastic welding machine (10) and the take-up system (30);

wherein the ultrasonic plastic welding machine (10) comprises:

a column (15);

an ultrasonic generator (14) mounted on the upright (15) and connected to the control system;

the handpiece (11) comprises a transducer (111) and a horn (112), the top end of the transducer (111) is connected with the ultrasonic generator (14), and the bottom end of the transducer is connected with the top end of the horn (112);

a die (12) attached to the bottom end of the horn (112) for providing a channel for securing the two wires and for contacting the sheaths of the two wires;

the workbench (13) is arranged below the machine head (11) and is used for providing an operation platform for the welding operation;

the machine head lifting device is respectively connected with the machine head (11) and the control system and is used for driving the machine head (11) to move downwards so that the mold (12) forms the channel, and when the two leads are fixed in the channel of the mold (12), pressure is applied to the mold (12) so that the sheaths of the two leads are contacted; the control system is used for controlling the movement of the machine head lifting device and controlling the machine head lifting device to apply pressure to the mould (12);

the control system is also used for controlling the ultrasonic generator (14) to provide ultrasonic frequency alternating electric energy for the transducer (111), so that the transducer (111), the amplitude transformer (112) and the mould (12) generate ultrasonic vibration, two conducting wires which are positioned on the workbench (13) and fixed on the mould (12) vibrate relatively, high-frequency friction is generated at the contact position of the sheaths of the two conducting wires, friction heat is generated, the sheaths of the two conducting wires are melted and welded to form the cable, and the cable can pass through the channel and is conveyed to the wire take-up system (30).

2. The apparatus of claim 1, wherein the payoff system (20) comprises:

a wire guide roller (21) around which two of the wires can be wound;

a damper (211) provided on the wire guide roller (21) for providing a predetermined damping so that the wire wound on the wire guide roller (21) is uniformly paid out;

the wire twisting mechanism (22) is arranged on one side of the wire guide roller (21), comprises a speed reducing motor (221) and a speed reducing gear (222), and is used for driving the wire guide roller (21) to rotate around the vertical central axis X of the wire guide roller (21) at a constant speed;

and a tension wheel (23) arranged on the path of the wire conveyed to the ultrasonic plastic welding machine (10) for guiding the wire to the ultrasonic plastic welding machine (10).

3. The apparatus of claim 1, wherein: the die (12) is a continuous welding die (12A) comprising:

an upper die body (12A1) fixed at the bottom end of the amplitude transformer (112) and a lower die body (12A2) fixed on the workbench (13); the upper die body (12A1) comprises an upper die base (12A11) connected with the bottom end of the amplitude transformer (112), an upper die base hole (121) is formed in the upper die base (12A11), and a driven roller (12A12) is movably matched in the upper die base hole (121); the lower die body (12A2) comprises a lower die base (12A21) fixed on the workbench (13), a lower die base hole (122) is formed in the lower die base (12A21), and a driving roller (12A22) is movably matched in the lower die base hole (122);

a motor (12A23) having an output shaft connected to a drive gear (12A24), wherein the drive gear (12A24) is engaged with a driven gear (12A25) fixed to the shaft of the drive roller (12A 22); the motor (12A23) drives the driving gear (12A24) to rotate so as to drive the driven gear (12A25) to rotate, and the driven gear (12A25) rotates so as to drive the driving roller (12A22) to roll;

the periphery of the driving roller (12A22) and the driven roller (12A12) is respectively provided with annular arc grooves (123,124) with the same specification and the groove width matched with the wires, when the positions of the annular arc grooves (123,124) correspond, the wires are respectively arranged in the annular arc groove (123) of the driving roller (12A22) and the annular arc groove (123) of the driven roller (12A12) in a partially clamped mode, and the wires can pass through the annular arc grooves (123,124) in a channel formed between the annular arc grooves (123,124) and enter the take-up system (30).

4. The apparatus of claim 1, wherein: the die (12) is an interrupted welding die (12B) comprising:

an upper die (12B1) fixed at the bottom end of the amplitude transformer (112) and a lower die (12B2) fixed on the workbench (13);

the upper die (12B1) and the lower die (12B2) are respectively provided with semicircular grooves (125,126) with the same specification and the groove width matched with the wires, when the semicircular grooves (125,126) correspond in position, the two separable wires with the sheaths are respectively and partially clamped in the semicircular grooves (125) of the upper die (12B1) and the semicircular grooves (126) of the lower die (12B2) and can pass through the passage formed between the semicircular grooves (125,126) and enter the take-up system (30).

5. The apparatus of claim 1, wherein: the wire take-up system (30) comprises:

the traction mechanism (32) is used for forcing the cable formed after welding to be twisted according to a preset twist pitch and guiding the twisted pair cable formed after twisting to pass through;

and a torque release mechanism (33) arranged on one side of the wire take-up roller (31) and used for releasing the torsional stress generated in the twisting process of the cable.

6. The apparatus according to claim 5, wherein the traction mechanism (32) comprises:

a traction motor (321) disposed downstream of the ultrasonic plastic welder (10);

a traction wheel (3211) connected to an output shaft of the traction motor (321);

the traction motor (321) and the traction wheel (3211) are used for continuously pulling the cable out of the ultrasonic plastic welding machine (10) at a stable speed;

and a guide wheel set (322) comprising at least two pairs of twisted guide wheels (3221) and at least one pair of traction stressing wheels (3222); the at least two pairs of twisted guide wheels (3221) are used for forcing the cable formed in the ultrasonic plastic welding machine (10) to pass in a spiral line according to a preset twisting pitch to form the twisted pair cable; the at least one pair of traction stress rollers (3222) are symmetrically arranged on two sides of the traction roller (3211) in a splitting manner and used for increasing the wrap angle of the twisted pair cable in contact with the traction roller (3211) and the friction force between the twisted pair cable and the traction roller;

the take-up roller assembly comprises:

a take-up roller (31) which is rotatable and around which the twisted pair cable is wound; the torque motor (34) drives the wire take-up roller (31) to rotate, the torque motor (34) is connected with the control system, and the control system is connected and used for controlling the torque motor (34) to operate;

the torque release mechanism (33) includes:

a speed reduction motor (331) provided on one side of the take-up roller (31); and a reduction gear (332) connected to the reduction motor (331).

7. The apparatus according to claim 5, wherein the take-up system (30) further comprises:

the wiring mechanism (36) is used for driving the wire collecting roller (31) to move up and down along the vertical central axis Y thereof so as to uniformly and densely wind the twisted pair cables on the wire collecting roller (31), and comprises:

a forward rotation gear pair (361) and a reverse rotation gear pair (362), the forward rotation gear pair (361) including a forward rotation drive gear (365) and a forward rotation driven gear (367); the counter gear pair (362) includes a counter drive gear (368) and a counter driven gear (369); the forward rotation driving gear (365) and the reverse rotation driving gear (368) are coaxially fixed at the top end and the bottom end of the rotating shaft of the wire take-up roller (31);

the reversing lead screw and nut pair comprises a lead screw (363), and the lead of the lead screw (363) is equal to the width of the twisted pair cable; the top end and the bottom end of the lead screw (363) are respectively connected with the positive rotation driven gear (367) and the reverse rotation driven gear (369) through sliding keys;

two sets of reversing clutches (364) respectively comprise jaw clutch discs, the jaw clutch discs are respectively connected with the top end and the bottom end of the lead screw (363), a driving disc of each jaw clutch disc is respectively and fixedly connected with the positive rotation driven gear (367) and the negative rotation driven gear (369), and a driven disc of each jaw clutch disc is respectively and coaxially and fixedly connected with the top end and the bottom end of the lead screw (363);

when the twisted pair cable is fully wound around the take-up roller (31) by one layer, the lead screw (363) pushes the reversing clutch (364) to change, and the take-up roller (31) is driven to move reversely along the vertical central axis Y.

8. The apparatus of claim 1 wherein the ultrasonic plastic welder (10) further comprises:

the cooling system comprises a cooling liquid tank (352) arranged on the workbench (13), and the cooling liquid tank (352) is used for storing cooling liquid;

and the spray head (351) is used for sucking the cooling liquid stored in the cooling liquid groove (352) and spraying the cooling liquid at the welding position of the two leads so as to cool and solidify the welding seam.

9. A method for keeping the lay length of a twisted pair cable fixed, based on the implementation of the device according to any of claims 1 to 8, characterized in that it comprises the following steps: