CN112064187B

CN112064187B - Magnetic suspension type driving method and device for longitudinal and transverse type braiding machine

Info

Publication number: CN112064187B
Application number: CN202010756334.7A
Authority: CN
Inventors: 殷俊清; 秦淑娟; 刘宽
Original assignee: Xian Polytechnic University
Current assignee: Xian Polytechnic University
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2022-09-23
Anticipated expiration: 2040-07-31
Also published as: CN112064187A

Abstract

The invention discloses a magnetic suspension type driving method and a magnetic suspension type driving device for a longitudinal and transverse type knitting machine. The device for realizing the method mainly comprises a square machine tool and the yarn carrying device, wherein the square machine tool is provided with a power-on circuit which is powered on with alternating current, the circuit is connected with a magnetic suspension driving device, the magnetic suspension driving device is divided into two parts, one part is a secondary coil winding arranged on the square machine tool, the other part is a driving block arranged at the bottom of each yarn carrying device, the secondary winding is powered on with alternating current, the secondary winding is enabled to have magnetism, magnetic poles of the secondary winding are constantly changed, and the driving of the yarn carrying device is realized by matching with the driving block. The driving method and the driving device can realize the suspension of the yarn carrier and the longitudinal and transverse weaving of the yarn carrier.

Description

Magnetic suspension type driving method and device for longitudinal and transverse type braiding machine

Technical Field

The invention belongs to the technical field of three-dimensional weaving, and particularly relates to a magnetic suspension type driving method and device for a longitudinal and transverse type weaving machine.

Background

The three-dimensional weaving technology of the four-step method enables the textile reinforced structure composite material to be developed to a three-dimensional profiling reinforcing stage from single fiber reinforcing, yarn reinforcing and two-dimensional fabric reinforcing. The composite material taking the prefabricated member formed by the weaving process as the reinforcing structure can avoid the layering phenomenon of the traditional composite material with the laminated structure, and has the advantages of low inherent mass, high strength and the like of the traditional composite material, good impact toughness, higher damage tolerance and excellent ablation resistance. Therefore, the three-dimensional knitting product of the 'four-step method' has excellent performance in a plurality of fields of application. The three-dimensional knitting machine is one of important processing equipment for forming three-dimensional composite materials and mainly comprises five parts, namely a knitting chassis, a yarn carrier, a tightening mechanism, an output curling mechanism and a control system. The weaving chassis is an important device for realizing a four-step weaving process and finishing the forming of the composite material prefabricated part, and the chassis driving device is one of the core components of the three-dimensional weaving machine. According to different shapes of woven fabrics, the three-dimensional knitting machine adopting the four-step method mainly comprises a circular machine and a square machine.

The so-called "four-step" method is a method in which one motion cycle of the knitting yarn is divided into 4 steps. Firstly, arranging yarns into a basic array according to the shape of the cross section of a fabric, wherein the motion rule is that 1, the yarns in odd rows and even rows move 1 step distance to the left and right respectively; step 2, yarns in odd-numbered rows and yarns in even-numbered rows respectively move downwards and upwards for 1 step distance; the motion of step 3 is opposite to step 1 and the motion of step 4 is opposite to step 2. The yarn is continuously moved by repeating the 4 steps. Therefore, the process characteristic of the four-step three-dimensional weaving is that the yarn carriers on the same row and the same column move synchronously, and the transverse movement (left-right movement) of the yarn carriers along with the chassis guide rail of the weaving machine and the longitudinal movement (up-down movement) of the yarn carriers in the sliding groove are two basic movements of the four-step three-dimensional weaving.

The existing chassis drive of the three-dimensional weaving square machine based on the four-step method has the following defects: (1) the structure is complex; (2) the processing cost is high; (3) the automation degree is low; (4) the fabric structure is single.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a magnetic suspension type driving method and a magnetic suspension type driving device for a longitudinal and transverse type knitting machine.

The invention provides the following technical scheme:

a magnetic suspension type driving device of a longitudinal and transverse type knitting machine comprises a square machine tool and a yarn carrier, wherein the square machine tool comprises a base, a bottom plate and an electromagnet, an alternating current circuit and a circuit communication hole are arranged on the base, n x n square groove matrixes are arranged on the base, the electromagnet is installed in each square groove, the n x n electromagnet matrixes form a secondary winding, the electromagnet consists of an iron core and a secondary coil, the bottom plate is provided with a bottom plate hole corresponding to each square groove, and the bottom plate is fixedly covered on the base;

the yarn carrying device comprises a driving block, a yarn carrying spindle and a yarn carrying rod from bottom to top in sequence, the yarn carrying rod is connected to the yarn carrying spindle, the yarn carrying spindle is fixed to the driving block, a groove is formed in the bottom of the driving block, a permanent magnet and a primary coil are installed in the groove, the bottom of each yarn carrying device is just right aligned to one of the electromagnets, the yarn carrying devices are total (n-1) x (n-1), and the yarn carrying devices are installed in a positioning device.

Further, the winding directions of the secondary coils of the adjacent rows and the adjacent columns of the secondary windings around the iron core are the same, and the winding directions of the secondary coils on the adjacent iron cores of each winding are opposite.

Further, the permanent magnets on all the adjacent driving blocks are arranged in the same mode.

The driving method of the magnetic suspension type driving device of the longitudinal and transverse type knitting machine comprises the following steps: after the secondary coil in the secondary winding is electrified, the electromagnet generates magnetism, the current of the secondary coil is controlled, the secondary winding generates magnetic poles which are the same as those of the primary coil at the bottom of the yarn carrier, the two magnetic poles repel each other to realize suspension of the yarn carrier, the current direction of the secondary coil is controlled to enable the secondary winding to change the magnetic poles, the magnetic poles interact with the permanent magnet at the bottom of the yarn carrier to generate driving force for weaving in a vertical and horizontal mode, the yarn carrier is suspended at a fixed position after moving one station every time by controlling the size and the frequency of the current of the secondary coil, and when the current direction of the secondary coil is changed again, the yarn carrier can move in a reverse direction to return to the original station, so that the current direction, the size and the frequency of the secondary coil are controlled repeatedly, and the vertical and horizontal weaving is realized.

Compared with the prior art, the invention has the following beneficial effects:

(1) the device has the advantages of simple structure, convenient installation, strong flexibility, high automation degree and low processing cost.

(2) The device realizes the independent control of the transverse and longitudinal movement of the yarn carriers, and can change the number and the distribution positions of the yarn carriers according to the requirements to realize different knitting structures.

(3) The device provided by the invention simultaneously realizes the suspension of the yarn carrier and reduces the friction loss of the yarn carrier.

(4) The driving method provided by the invention is simple and feasible and has stable functions.

Drawings

FIG. 1 is a schematic view of the overall structure of a magnetic suspension driving device of a yarn carrier according to the present invention.

FIG. 2 is a top view of the magnetic levitation drive apparatus of the yarn carrier of the present invention.

FIG. 3 is a left side view of the magnetic suspension driving device of the yarn carrier of the present invention.

FIG. 4 is a schematic view of the structure of the yarn carrier of the present invention.

Fig. 5 is a schematic diagram of the suspension of the device of the present invention.

FIG. 6 is a schematic diagram of the device of the present invention for driving the yarn carrier to move to the left by one station.

The yarn carrying device comprises a base 1, a machine base 2, a bottom plate 3, an electromagnet 4, a circuit communication hole 5, an iron core 6, a secondary coil 7, a driving block 8, a yarn carrying spindle 9, a yarn carrying rod 10, a permanent magnet 11, a primary coil 12, a primary coil magnetic pole 13, a secondary coil magnetic pole 14 and a permanent magnet magnetic pole.

Detailed Description

The technical solution of the present invention is clearly and completely described below with reference to specific embodiments. It is obvious that the described embodiments are only some of the embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

As shown in fig. 1 to 4, a magnetic suspension type driving device for a longitudinal and transverse type knitting machine comprises a square machine tool and a yarn carrier, wherein the square machine tool comprises a machine base 1, a base plate 2 and an electromagnet 3, an alternating current circuit and a circuit communication hole 4 are arranged on the machine base 1, 7x7 square groove matrixes are arranged on the machine base 1, the electromagnet 3 and 7x7 matrixes of the electromagnet 3 are arranged in the square grooves to form secondary windings, the electromagnet 3 consists of an iron core 5 and a secondary coil 6, a base plate hole corresponding to the square groove is arranged on the base plate 2, and the base plate 2 is fixedly covered on the machine base 1.

The yarn carrying device sequentially comprises a driving block 7, a yarn carrying spindle 8 and a yarn carrying rod 9 from bottom to top, the yarn carrying rod 9 is connected to the yarn carrying spindle 8, the yarn carrying spindle 8 is fixed to the driving block 7, a groove is formed in the bottom of the driving block 7, a permanent magnet 10 and a primary coil 11 are installed in the groove, the bottom of each yarn carrying device is just opposite to one electromagnet 3, the number of the yarn carrying devices is 6 x 6, and the yarn carrying devices are installed in a positioning device. The winding directions of the secondary coils (6) of the adjacent rows and the adjacent columns of the secondary windings around the iron core (5) are the same, and the winding directions of the secondary coils (6) on the adjacent iron cores of each winding are opposite. The permanent magnets 10 on adjacent driving blocks 7 are arranged in the same manner.

As shown in fig. 5, the electromagnet 3 of the secondary winding cooperates with the primary coil 11 at the bottom of the yarn carrier, and after the electromagnet 3 in the secondary winding is electrified, the electromagnet becomes a magnetic pole which is the same as the magnetic pole of the primary coil 11 right above, so as to generate a repulsive force, and the primary coil 11 is driven by the upward repulsive force to move the driving block upwards, so that the yarn carrier is suspended.

A driving method adopting a magnetic suspension type driving device of a longitudinal and transverse type knitting machine comprises the following steps: after a secondary coil 6 in a secondary winding is electrified, an electromagnet 3 generates magnetism, the current of the secondary coil 6 is controlled, the secondary winding generates magnetic poles which are the same as the magnetic poles of a primary coil 11 at the bottom of a yarn carrier, the magnetic poles repel each other pairwise to realize suspension of the yarn carrier, the current direction of the secondary coil 6 is controlled to enable the magnetic poles of the secondary winding to be changed to interact with a permanent magnet 10 at the bottom of the yarn carrier to generate driving force for weaving in a longitudinal and transverse mode, the yarn carrier can hover at a fixed position after moving one station every time by controlling the size and the frequency of the current of the secondary coil 6, and when the current direction of the secondary coil 6 is changed again, the yarn carrier can move in a reverse mode to return to the original station, so that the current direction, the size and the frequency of the secondary coil 6 are controlled repeatedly, and the longitudinal and transverse weaving is realized.

As shown in fig. 6, the principle of the process of driving the yarn carrier to move to the left by one station is as follows:

the permanent magnets 10 on the secondary winding and the driving block are mutually matched, the electromagnet 3 is continuously changed between N, S magnetic poles by changing the direction of the current in the secondary winding 6, if the transverse yarn carrier is moved leftwards, the S pole of the permanent magnet 10 at the bottom of the yarn carrier is attracted by the N pole of the electromagnet arranged on the secondary winding near the left, and is repelled by the S pole of the electromagnet arranged on the right of the secondary winding, and the driving block drives the yarn carrier to move leftwards under the action of the left attraction force and the right repulsion force; after the yarn carrier reaches the middle position of the two stations, the current direction of the secondary winding is changed, the N pole of the secondary winding is changed into the S pole, and the S pole is changed into the N pole, so that the S pole of the electromagnet 3 at the lower right of the yarn carrier generates leftward repulsive force to the S pole of the permanent magnet 10 of the yarn carrier, and meanwhile, the S pole of the permanent magnet 10 at the bottom of the yarn carrier generates attractive force to the N pole of the permanent magnet 10 at the right of the yarn carrier.

After the yarn carrier arrives at the next station, the yarn carrier moves rightwards, only the current direction needs to be changed again, the driving principle is similar to the principle of realizing the leftwards movement of the whole row of yarn carriers, and meanwhile, the longitudinal front-back driving principle is also the same; the longitudinal and transverse driving of the yarn carrier is realized by controlling the secondary winding and the permanent magnet at the bottom of the yarn carrier by changing the current direction, and in the movement process of the yarn carrier, the movement speed and the stroke of the yarn carrier can be adjusted by adjusting the frequency and the size of alternating current in the secondary coil, so that the yarn carrier can hover after moving to a specified position.

Claims

1. A magnetic suspension type driving device of a longitudinal and transverse type knitting machine comprises a square machine tool and a yarn carrier, and is characterized in that the square machine tool comprises a base (1), a bottom plate (2) and electromagnets (3), an alternating current circuit and a circuit communication hole (4) are arranged on the base (1), n multiplied by n square groove matrixes are arranged on the base (1), the electromagnets (3) are installed in the square grooves, the n multiplied by n electromagnet matrixes (3) form a secondary winding, the electromagnets (3) consist of an iron core (5) and a secondary coil (6), bottom plate holes corresponding to the square grooves are formed in the bottom plate (2), and the bottom plate (2) is fixedly covered on the base (1);

the yarn carrying device sequentially comprises a driving block (7), yarn carrying spindles (8) and a yarn carrying rod (9) from bottom to top, the yarn carrying rod (9) is connected to the yarn carrying spindles (8), the yarn carrying spindles (8) are fixed to the driving block (7), grooves are formed in the bottom of the driving block (7), permanent magnets (10) and primary coils (11) are installed in the grooves, the bottom of each yarn carrying device is right opposite to one electromagnet (3), the number of the yarn carrying devices is (n-1) x (n-1), the yarn carrying devices are installed right above the electromagnets (3), and the arrangement modes of the permanent magnets (10) on all adjacent driving blocks (7) are the same;

after the secondary coil (6) in the secondary winding is electrified, the electromagnet (3) generates magnetism, the secondary winding generates magnetic poles which are the same as the primary coil (11) at the bottom of the yarn carrier by controlling the current of the secondary coil (6), the two magnetic poles repel each other to realize the suspension of the yarn carrier, the secondary winding changes the magnetic poles by controlling the current direction of the secondary coil (6), the magnetic poles interact with the permanent magnet (10) at the bottom of the yarn carrier to generate a vertically and horizontally woven driving force, the yarn carrier can reversely move to return to the original station by controlling the size and the frequency of the current of the secondary coil (6) after moving one station every time, and the current direction, the size and the frequency of the secondary coil (6) are repeatedly controlled, thereby realizing the vertical and horizontal weaving.