CN115287818B - Yarn carrier with function of actively controlling yarn tension and method - Google Patents

Abstract

A yarn carrier with active yarn tension control function and method thereof, comprising a frame, a crimping mechanism, a control module, a tension sensor, an electric energy transmission system and a yarn guide rod; the crimping mechanism, the control module and the tension sensor are sequentially arranged at the upper part of the stand from top to bottom, and the electric energy transmission system is arranged at the lower part of the stand and connected with the stand; the yarn cylinder is connected with a main shaft of a motor, the motor is fixed at the top of a motor supporting plate, a plurality of upper connecting rods are arranged at the lower part of the motor supporting plate, the lower end of each upper connecting rod is connected with the upper surface of the frame, and the upper end of each upper connecting rod is fixed at the edge of the motor supporting plate; the singlechip is fixed in the middle of the upper connecting rod; the tension sensor is connected with the frame, and the lower end of the yarn guide rod is connected with the upper surface of the frame; the tension sensor is connected with the singlechip in a communication way, and the signal output end of the singlechip is connected with the signal input end of the motor. The utility model ensures that the structure of the braided fabric is more stable and uniform, and improves the automation degree and the braiding efficiency of three-dimensional braiding.

Description

Yarn carrier with function of actively controlling yarn tension and method

Technical Field

The utility model relates to a yarn carrier and a weaving method, in particular to a yarn carrier with a function of actively controlling yarn tension and a method thereof, belonging to the field of weaving machinery.

Background

With the wider and wider application of the composite material and the rapid development of advanced technologies in the fields of aerospace, missiles, atomic energy, high-speed vehicles and the like, compared with the traditional metal materials, the three-dimensional braiding technology is utilized to firstly braid some complex-shaped prefabricated parts on the three-dimensional braiding equipment and then process the complex-shaped prefabricated parts to form the composite material, so that the mechanical property is greatly improved, the designability of the prefabricated part structure is also greatly improved, and the requirement on the three-dimensional braiding technology is more and more strong. Research and development of three-dimensional weaving related equipment began in the late 60 s of the 20 th century. The full-automatic three-dimensional braiding machine developed in 1973 of Maister corporation of Germany is regarded as a first three-dimensional braiding device, and four-step three-dimensional braiding devices capable of continuously feeding yarns are developed in the university of North Carolina in 1989 of America, so that the braiding efficiency is obviously improved. The domestic three-dimensional knitting technology is studied later than overseas, but is developed more rapidly.

The three-dimensional braided fabric is completed through the movement of the yarn carrier on the three-dimensional braiding machine, and the application of the yarn carrier greatly enhances the applicability of the three-dimensional braiding technology. Therefore, the yarn carrier is an important link for connecting yarns and a braiding machine, so that the design of the yarn carrier is one of the important research points of domestic and overseas scientific research staff. However, the traditional yarn carrier only plays roles of carrying yarns and conveying yarns in the whole knitting process, which cannot completely meet the technological requirements, and tension control of the yarns in the knitting process by the yarn carrier becomes a key for development of the active yarn carrier.

The utility model discloses a device for controlling yarn tension of a yarn carrier, which has the application number of 201720458645.9 and is named as a device for controlling yarn tension of the yarn carrier, and comprises a unidirectional self-locking mechanism, an arc-shaped supporting plate, a cross beam and a supporting frame; the unidirectional self-locking mechanism is fixedly connected to the base through bolts, the yarn cylinder shaft is arranged on the base, the yarn cylinder is arranged on the yarn cylinder shaft, and the base is provided with an arc-shaped supporting plate and is positioned behind the yarn cylinder shaft. The upper and lower of the yarn cylinder are respectively provided with a yarn cylinder lower stop block and a yarn cylinder upper stop block, the yarn cylinder lower stop block and the yarn cylinder upper stop block are respectively welded at the upper and lower ends of the yarn cylinder, and the yarn cylinder lower stop block is kept in contact with the unidirectional self-locking mechanism. Two springs are vertically and downwards arranged at the other ends of the two cross beams, a cross beam upper shaft is vertically arranged in the middle of the two cross beams, two ends of the cross beam upper shaft respectively penetrate through the two cross beams, two support columns are connected at two end parts extending out of the cross beams, the support columns are vertical to the cross beam upper shaft, and the cross beam upper shaft can rotate in the cross beams. The middle part of the upper shaft of the cross beam is provided with a pulley, and an adhesive connection mode is adopted; the end-to-end connection of two support columns has the crossbeam lower shaft, and the middle part of crossbeam lower shaft is provided with the pulley, and spring one end is connected with the crossbeam, and the other end is connected on the crossbeam lower shaft, and two springs are located the both sides of pulley respectively and are close to the position of support column, adopt sticky connected mode. The utility model provides a take yarn ware to the control of yarn tension, but the spring is elastic component, and its compensation tension is unstable, can't guarantee that yarn tension moment is in the optimal range to the controllable volume of yarn is also very limited, and when the yarn length that can control is exceeded to take yarn ware travel path, this patent application can't continue to control yarn tension, consequently, is not applicable to the braider that the travel distance is long, in addition, this structure is bulky, can't satisfy numerous take yarn ware simultaneous working, engineering application is limited.

The utility model application with the application number of 202111618873.5, named as a knitting method and a special device of a three-dimensional knitted fabric, discloses a knitting method and a special device of the three-dimensional knitted fabric, models a three-dimensional knitted prefabricated member through computer software, analyzes and calculates knitting process parameters, fits movement steps and movement tracks of yarns, then issues the knitting process parameters to a rechargeable intelligent control movement module provided with a yarn carrier with tension control feedback, the intelligent control movement module moves on a knitting disc according to instructions issued by a computer, divides the knitting disc into a plurality of virtual grids through a computer program, divides movement paths for the intelligent movement control module according to time sequences and coordinates, drives the yarns to move, the lower movement unit moves to complete knitting, and an upper lifting mechanism lifts the knitted prefabricated member upwards. The yarn carrier is fitted with the movement step of yarn through computer software and then is controlled to move through a wireless network, the control module adopts a charging type, although the whole intelligence is strong, the adoption of the wireless control module can lead to the enlargement of the volume of the yarn carrier, the adoption of charging type electric energy supply can generate the problems of heat dissipation, wear, installation and the like, in a large-scale braiding machine, if thousands of yarn carriers work together, the problems reflected by the volume of the yarn carrier and the charging mode can be amplified infinitely, in addition, the cost of the whole process intelligent control is high, so the patent application can not meet the requirement of a large-scale three-dimensional braiding machine, and engineering application is limited.

Disclosure of Invention

The utility model provides a yarn carrier with an active yarn tension control function and a method thereof, which aim to overcome the defects of the prior art. The yarn carrier overcomes the periodic fluctuation of yarn tension in the traditional braiding machine, can actively control the yarn tension to be constant, ensures that the structure of the braided fabric is more stable and uniform, and improves the automation degree and the braiding efficiency of three-dimensional braiding.

A yarn carrier with an active yarn tension control function comprises a rack, a crimping mechanism, a control module, a tension sensor, an electric energy transmission system and a yarn guide rod; the crimping mechanism, the control module and the tension sensor are sequentially arranged at the upper part of the stand from top to bottom, and the electric energy transmission system is arranged at the lower part of the stand and is connected with the stand;

the crimping mechanism comprises a yarn cylinder, a motor supporting plate and upper connecting rods, wherein the yarn cylinder is connected with a main shaft of the motor, the motor is fixed at the top of the motor supporting plate, a plurality of upper connecting rods are arranged at the lower part of the motor supporting plate, the lower end of each upper connecting rod is connected with the upper surface of the frame, and the upper end of each upper connecting rod is fixed at the edge of the motor supporting plate;

the control module comprises a singlechip, a plurality of holes are drilled on the edge of a system board of the singlechip for the upper connecting rod to pass through, and the singlechip is fixed in the middle of the upper connecting rod; the tension sensor is connected with the frame and fixed on the upper surface of the frame, and the lower end of the yarn guide rod is connected with the upper surface of the frame; the tension sensor is connected with the singlechip in a communication way, the signal output end of the singlechip is connected with the signal input end of the motor, and the electric energy transmission system is a sliding contact electricity transmission system and comprises: a current collecting unit and a rectifying unit; the collecting unit collects alternating current on the ground network; the rectification unit comprises a rectifier, wherein the rectifier is fixed on the lower surface of the frame, and the alternating current collected by the current collecting unit is converted into direct current which can be directly used by the motor, the singlechip and the tension sensor.

A braiding method of a yarn carrier with an active yarn tension control function comprises the following steps;

s1: the ground screen is powered on with alternating current according to requirements, the conductive wheel moves on the ground screen to collect the alternating current, the alternating current is transmitted to the rectifier, rectified into direct current and then transmitted to the motor, the singlechip and the tension sensor, and the yarn carrier starts to work;

s2: the yarn starts from the yarn cylinder, passes through the yarn guide rod to the tension sensor, returns to the yarn guide rod, and is conveyed out from the top end of the yarn guide rod to be woven, wherein the yarn tension meets the rated yarn tension at the moment, and the motor rotates forward to rotate the yarn cylinder to discharge yarn;

s3: the single chip microcomputer receives tension signals transmitted by the tension sensor in real time, when displacement close to the direction of the braided fabric is generated, yarn tension measured by the tension sensor is smaller than a rated yarn tension value, the single chip microcomputer sends a winding instruction to the motor, and the motor rotates reversely to rotate the yarn drum reversely to receive yarn;

s4: when the yarn tension measured by the tension sensor meets the rated yarn tension value again, the singlechip sends a release instruction to the motor, and the motor rotates forward so that the yarn cylinder rotates to discharge yarns;

s5: and when the weaving process is finished, disconnecting the power supply of the grounding grid, and stopping working in each link.

Compared with the prior art, the utility model has the beneficial effects that:

1. the yarn tension is actively controlled through the mutual cooperation of the crimping mechanism, the tension sensor and the control module, so that the yarn can be uniformly released at the optimal knitting speed, and the redundant yarn can be completely rewound under any condition, so that the unprecedented active yarn releasing and active yarn collecting are realized, the simultaneous operation of any number of yarn carriers can be satisfied, the yarn tension control device is suitable for a large three-dimensional knitting machine, the yarn tension in the whole knitting process is ensured to be in the optimal range, and the comprehensive mechanical property and the quality stability of the knitting are improved.

2. The electric energy transmission system is in a sliding contact power transmission mode, so that the problem of power line winding of a yarn carrier in the working process caused by wired power supply is avoided, and the problems of heat dissipation, service life and installation and replacement caused by battery power supply are also solved; the yarn carrier is suitable for any working environment, ensures the continuous and stable current of the yarn carrier in the working process, and provides reliable energy guarantee for the effective control of the yarn carrier on the yarn.

3. The utility model has compact structural design, arranges each component in the vertical direction of the frame, compresses the area of the maximum cross section of the yarn carrier to the greatest extent, ensures the minimum volume under the condition of meeting the working requirement, and further increases the maximum number of yarn carriers which can participate in knitting at the same time, thereby being applicable to large-scale three-dimensional knitting machines.

4. The crimping mechanism adopts the motor to control the yarn cylinder, has small volume and stable output power, and can cope with large braided fabrics with any shape; the control module is controlled by the singlechip, has low voltage and low energy consumption, is convenient to produce and install, and has high reliability; the yarn tension is measured through the real-time detection of the tension sensor, the integration and the intellectualization are realized, the data are accurate, and the installation is simple.

The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples:

drawings

FIG. 1 is an overall three-dimensional schematic of the present utility model;

FIG. 2 is a three-dimensional schematic of a crimping mechanism;

FIG. 3 is a three-dimensional schematic of a control module and a detection mechanism;

FIG. 4 is a three-dimensional schematic of a frame;

FIG. 5 is a three-dimensional schematic of an electrical energy transfer system;

fig. 6 is a schematic diagram of a ground grid and power transmission system for collecting electricity and transmitting electricity.

In the figure: 1 is a frame, 2 is a crimping mechanism, 21 is a yarn cylinder, 22 is a motor, 23 is a motor supporting plate, 24 is an upper connecting rod, 25 is a nut, 31 is a single chip microcomputer, 32 is a bolt, 41 is a tension sensor, 5 is an electric energy transmission system, 51 is a rectifier, 52 is a conductive wheel, 53 is a wheel carrier, 54 is a lower connecting rod, 55 is a nut, 61 is a yarn guide rod, 71 is a conductive strip, and 72 is an insulating strip.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.

It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

As shown in fig. 1 to 3, a yarn carrier having a function of actively controlling yarn tension includes a frame 1, a crimping mechanism 2, a control module, a tension sensor 41, an electric power transmission system 5, and a yarn guide bar 61;

the crimping mechanism 2, the control module and the tension sensor 41 are sequentially arranged at the upper part of the frame 1 from top to bottom, and the electric energy transmission system 5 is arranged at the lower part of the frame 1 and is connected with the frame 1;

the crimping mechanism 2 comprises a yarn cylinder 21, a motor 22, a motor supporting plate 23 and upper connecting rods 24, wherein the yarn cylinder 21 is connected with a main shaft of the motor 22, the motor 22 is fixed at the top of the motor supporting plate 23, a plurality of upper connecting rods 24 are arranged at the lower part of the motor supporting plate 23, the lower end of each upper connecting rod 24 is in threaded connection with the upper surface of the frame 1, and the upper end of each upper connecting rod 24 is fixed at the edge of the motor supporting plate 23; the upper end of the upper connecting rod 24 is fixed to the edge of the motor supporting plate 23 through two nuts A25 which are respectively used for fixing the upper surface and the lower surface of the motor supporting plate 23,

alternatively, the upper surface of the motor support plate 23 is 5mm to 8mm from the top end of the upper link 24; the nut is convenient to fix and use, and reliable and stable installation is ensured.

The control module 3 comprises a single chip microcomputer 31, a plurality of holes are formed in the edge of a system board of the single chip microcomputer 31, the upper connecting rod 24 passes through the holes, the single chip microcomputer is fixed in the middle of the upper connecting rod 24, a nut B32 is used for fixing the single chip microcomputer 31 in the middle of the upper connecting rod 24, the tension sensor 41 is connected with the frame 1 through screws and is fixed on the upper surface of the frame 1, the lower end of the yarn guide rod 61 is connected with the upper surface of the frame 1, the tension sensor 41 is connected with the single chip microcomputer 31 in a communication mode, and the signal output end of the single chip microcomputer 31 is connected with the signal input end of the motor 22. In this embodiment, the singlechip 31 inputs a specific program, so as to ensure that the control module 3 can analyze and process the yarn tension signal transmitted from the tension sensor 41 in real time, and send a corresponding instruction to the motor 22 of the crimping mechanism 2 according to the corresponding signal, thereby controlling the release and winding of the yarn.

The electric energy transmission system 5 is a sliding contact electricity transmission system, adopts a ground network electricity transmission system, and comprises: a current collecting unit and a rectifying unit; the collecting unit collects alternating current on the ground network; the rectifying unit comprises a rectifier 51, wherein the rectifier 51 is fixed on the lower surface of the frame 1, and converts the alternating current collected by the current collecting unit into direct current which can be directly used by the motor 22, the singlechip 31 and the tension sensor 41.

In general, the motor 22 is preferably a miniature DC reduction motor.

Further, as a possible embodiment, the rack 1 is an oval thick plate, the upper part of the oval thick plate is provided with the curling mechanism 2 and the control module 3, and the lower part of the oval thick plate is provided with the electric energy transmission system 5.

Preferably, the rated voltages of the motor 22 and the tension sensor 41 are the same, and the forward rotation of the motor 22 drives the yarn drum 21 to release the yarn at a speed consistent with the yarn running speed in the knitting process. The rated voltage of the motor 22 and the rated voltage of the yarn drum 21 are ensured to be the same, and the principle of minimum volume is met, so that the speed of releasing the yarn by the motor 22 which rotates positively is ensured to be consistent with the running speed of the yarn in the knitting process.

The ground network type electricity transmission is a sliding contact electricity transmission mode, the electricity collection unit comprises a conductive wheel 52, a conductive wheel frame 53 and lower connecting rods 54, the conductive wheel 52 is in insulating connection with the conductive wheel frame 53 and can rotate 360 degrees relative to the conductive wheel frame 53, the upper portion of the conductive wheel frame 53 is provided with a plurality of lower connecting rods 54, the upper end of each lower connecting rod 54 is connected with the lower surface of the frame 1, and the lower end of each lower connecting rod 54 is fixed at the edge of the conductive wheel frame 53.

Typically, the number of upper links 24 and lower links 54 is 4, and this is arranged to ensure stability of the connection in a minimum number.

The ground grid type electricity transmission is a sliding contact electricity transmission mode, the ground grid is conductive strips 71 paved in parallel on a plane or a curved surface, the conductive strips 71 are separated by insulating strips 72, the adjacent conductive strips 71 are not connected with the same alternating current power supply, three conductive wheels 52 are arranged in an equilateral triangle shape, any two conductive wheels 52 and the adjacent conductive strips 71 form a loop, and the conductive wheels 52 collect alternating current from the ground grid.

As shown in fig. 6, in one possible embodiment, at least 5 conductive strips are laid in parallel on a plane or a curved surface, the conductive strips are separated by an insulating strip 72, and adjacent conductive strips 71 are ensured not to be connected with the same alternating current power supply (zero line and live line), so as to form the grounding grid; the current collecting unit collects alternating current from the grounding grid through the three conductive wheels 52, the three conductive wheels 52 are arranged in an equilateral triangle shape, so that the single current collecting unit can be guaranteed to run to the place, the three conductive wheels 52 are not located on the same conductive strip 71 on the grounding grid at the same time, any two conductive wheels 52 and adjacent conductive strips 71 of the grounding grid form a loop, the conductive wheels 52 collect alternating current from the grounding grid, and continuous and stable current is guaranteed.

Based on the above scheme, as a possible implementation manner, the alternating current transportation from the conductive wheel 52 to the rectifier 51 and the direct current transportation from the rectifier 51 to the motor 22, the singlechip 31 and the tension sensor 41 respectively adopt wired transportation, and 3-5 holes through which wires can pass are arranged at the edges of the frame 1 and the conductive wheel frame 53.

Based on the above-mentioned scheme, as another possible implementation manner, there is also provided a knitting method of a yarn carrier actively controlling yarn tension, including the following steps;

s1: the ground screen is connected with alternating current according to the requirement, the conductive wheel 52 moves on the ground screen to collect alternating current, the alternating current is transmitted to the rectifier 51, rectified into direct current and then transmitted to the motor 22, the singlechip 31 and the tension sensor 41, and the yarn carrier starts to work;

s2: the yarn starts from the yarn cylinder 21, passes through the yarn guide rod 61 to the tension sensor 41, returns to the yarn guide rod 61, and is conveyed out from the top end of the yarn guide rod 61 to be knitted, and at this time, the yarn tension meets the rated yarn tension, the motor 22 rotates forward and the yarn cylinder 21 rotates to discharge yarn;

s3: the singlechip 31 receives the tension signal transmitted by the tension sensor 41 in real time, when displacement close to the knitting direction is generated, the yarn tension measured by the tension sensor 41 is smaller than a rated yarn tension value, the singlechip 31 sends a rewinding command to the motor 22, and the motor 22 reversely rotates so that the yarn drum 21 reversely rotates to receive yarns;

s4: when the yarn tension measured by the tension sensor 41 meets the rated yarn tension value again, the singlechip 31 sends a release instruction to the motor 22, and the motor 22 rotates forward so that the yarn drum 21 rotates to discharge yarns;

s5: and when the weaving process is finished, disconnecting the power supply of the grounding grid, and stopping working in each link.

As the supplement, the singlechip program design requirement is as follows:

s1: setting a certain rated yarn tension value, and receiving yarn tension signals measured by a detection mechanism in real time;

s2: when the yarn tension signal measured by the detection mechanism is judged to be greater than or equal to the rated value, a yarn releasing instruction is sent to the crimping mechanism;

s3: and when the yarn tension signal measured by the detection mechanism is judged to be smaller than the rated value, sending a yarn rewinding command to the crimping mechanism.

As a supplement to the above, wherein:

s1: mounting of the tension sensor 41;

a tension sensor 41 is fixed on the upper surface of the frame 1 by a screw;

s2: mounting a control module 3;

the lower end of the upper connecting rod 24 is screwed into a threaded hole on the upper surface of the frame 1, the upper end of the upper connecting rod 24 passes through a corresponding hole of a system board of the singlechip 31, the system board of the singlechip 31 descends to the end of the upper end thread of the upper connecting rod 24 to be clamped, and then a nut 32 is screwed into the upper end of the upper connecting rod 24 and fastens the system board of the singlechip 31;

s3: mounting of the crimping mechanism 2;

the nut A25 is screwed into the upper end of the upper connecting rod 24, the position 8mm to 10mm away from the upper end of the upper connecting rod 24 is stopped, the upper end of the upper connecting rod 24 passes through a corresponding hole of the motor supporting plate 23, the nut A25 is screwed into the upper end of the upper connecting rod 24 to fasten the motor supporting plate 23, the position of the nut screwed into the upper connecting rod 24 is ensured to be the same, the motor 22 is fixed in a middle groove of the motor supporting plate 23 in a bolt or pasting mode, and a main shaft of the motor 22 is inserted into a corresponding groove hole of the yarn cylinder 21;

s4: the yarn guide mechanism 6 is installed;

the lower end of the yarn guide rod 61 is screwed into a threaded hole on the upper surface of the frame 1;

s5: installation of the power transmission system 5;

the rectifier 51 is fixed on the lower surface of the frame 1 by adopting screws, the upper end of the lower connecting rod 54 is screwed into a threaded hole on the lower surface of the frame 1, the lower end of the lower connecting rod 54 is inserted into a hole on the edge of the conductive wheel frame 53, the conductive wheel frame 53 is fastened by the nut B55, and the conductive wheel 52 is installed on the lower surface of the conductive wheel frame 53 in a universal (360 DEG rotation) insulating mode.

The present utility model has been described in terms of preferred embodiments, but is not limited to the utility model, and any equivalent embodiments can be made by those skilled in the art without departing from the scope of the utility model, as long as the equivalent embodiments are possible using the above-described structures and technical matters.

Claims (4)

1. A take yarn ware that possesses initiative control yarn tension function, its characterized in that: comprises a frame (1), a crimping mechanism (2), a control module, a tension sensor (41), an electric energy transmission system (5) and a yarn guide rod (61);

the crimping mechanism (2), the control module (3) and the tension sensor (41) are sequentially arranged at the upper part of the frame (1) from top to bottom, and the electric energy transmission system (5) is arranged at the lower part of the frame (1) and is connected with the frame (1);

the crimping mechanism (2) comprises a yarn cylinder (21), a motor (22), a motor supporting plate (23) and upper connecting rods (24), wherein the yarn cylinder (21) is connected with a main shaft of the motor (22), the motor (22) is fixed at the top of the motor supporting plate (23), a plurality of upper connecting rods (24) are arranged at the lower part of the motor supporting plate (23), the lower end of each upper connecting rod (24) is connected with the upper surface of the frame (1), and the upper end of each upper connecting rod (24) is fixed at the edge of the motor supporting plate (23);

the control module comprises a singlechip (31), wherein a plurality of holes are drilled on the edge of a system board of the singlechip (31) for the connecting rod (24) to pass through, and the singlechip (31) is fixed in the middle of the upper connecting rod (24); the tension sensor (41) is connected with the frame (1) and is fixed on the upper surface of the frame (1), the lower end of the yarn guide rod (61) is connected with the upper surface of the frame (1), the tension sensor (41) is connected with the singlechip (31) in a communication way, and the signal output end of the singlechip (31) is connected with the signal input end of the motor (22);

the electric energy transmission system (5) is a sliding contact electricity transmission system, comprising: a current collecting unit and a rectifying unit; the collecting unit collects alternating current on the ground network; the rectification unit comprises a rectifier (51), wherein the rectifier (51) is fixed on the lower surface of the frame (1) and converts alternating current collected by the current collecting unit into direct current which can be directly used by the motor (22), the singlechip (31) and the tension sensor (41);

the current collecting unit comprises a conductive wheel (52), a conductive wheel frame (53) and lower connecting rods (54), wherein the conductive wheel (52) is in insulating connection with the conductive wheel frame (53) and can rotate 360 degrees relative to the conductive wheel frame (53), the upper part of the conductive wheel frame (53) is provided with a plurality of lower connecting rods (54), the upper end of each lower connecting rod (54) is connected with the lower surface of the frame (1), and the lower end of each lower connecting rod (54) is fixed at the edge of the conductive wheel frame (53); the ground network is formed by conducting strips (71) paved in parallel on a plane or a curved surface, the conducting strips (71) are separated by insulating strips (72), the adjacent conducting strips (71) are not connected with the same alternating current power supply, three conducting wheels (52) are arranged in an equilateral triangle shape, any two conducting wheels (52) and the adjacent conducting strips (71) form a loop, and the conducting wheels (52) collect alternating current from the ground network.

2. A yarn carrier with active yarn tension control function as in claim 1, wherein: the rated voltages of the motor (22) and the tension sensor (41) are the same, and the motor (22) rotates positively to drive the yarn drum (21) to release yarn at the same speed as the yarn running speed in the knitting process.

3. A yarn carrier with active yarn tension control function as in claim 1, wherein: the alternating current transportation from the conductive wheel (52) to the rectifier (51) and the direct current transportation from the rectifier (51) to the motor (22), the singlechip (31) and the tension sensor (41) respectively adopt wired transportation, and holes capable of passing through wires are formed in the edges of the frame (1) and the conductive wheel frame (53).

4. A method of knitting a yarn carrier having an active yarn tension control function as claimed in claim 1, characterized by: comprises the following steps of;

s1: the ground network is powered on with alternating current according to requirements, the conductive wheel (52) moves on the ground network to collect the alternating current, the alternating current is transmitted to the rectifier (51), the alternating current is rectified into direct current, and then the direct current is transmitted to the motor (22), the singlechip (31) and the tension sensor (41), and the yarn carrier starts to work;

s2: the yarn starts from the yarn cylinder (21), passes through the yarn guide rod (61) to the tension sensor (41), returns to the yarn guide rod (61), and is conveyed out from the top end of the yarn guide rod (61) to be knitted, wherein the yarn tension meets the rated yarn tension at the moment, and the motor (22) rotates forward to rotate the yarn cylinder (21) to discharge the yarn;

s3: the single chip microcomputer (31) receives tension signals transmitted by the tension sensor (41) in real time, when displacement close to the direction of the braided fabric is generated, yarn tension measured by the tension sensor (41) is smaller than a rated yarn tension value, the single chip microcomputer (31) sends a winding instruction to the motor (22), and the motor (22) rotates reversely to rotate the yarn drum (21) reversely to collect yarns;

s4: when the yarn tension measured by the tension sensor (41) meets the rated yarn tension value again, the singlechip (31) sends a release instruction to the motor (22), and the motor (22) rotates forward to rotate the yarn drum (21) to discharge yarns;

s5: and when the weaving process is finished, disconnecting the power supply of the grounding grid, and stopping working in each link.