CN106854792A - Based on the device and method that three-dimensional loom fabric tissue is compensated to warp tension - Google Patents

Abstract

The invention provides a device for compensating warp yarn tension based on the fabric structure of a three-dimensional loom. The three-dimensional loom includes a warp beam, and the warp yarn coming out of the warp beam passes through a layered frame, passes through a heald frame and is interwoven with a weft yarn to form a fabric; The device for compensating warp tension includes tension roller and its drive device for synchronously compensating warp elongation or shrinkage caused by the up and down movement of the heald frame. Each warp beam is correspondingly equipped with a tension roller. The warp yarn passes over the tension roller in a U shape, then passes through the layered frame, passes through the heald frame and interweaves with the weft yarn. The invention also provides a method for compensating the warp tension based on the fabric structure of the three-dimensional loom. The active compensation device provided by the invention is simple in structure and reliable in performance, and can well adapt to the weaving of high-performance fibers such as carbon fibers with poor elasticity, and can meet the compensation requirements of multi-opening three-dimensional looms and frequent changes in the same heald frame, and improve improved loom efficiency and fabric quality.

Description

Device and method for compensating warp tension based on three-dimensional loom fabric structure

technical field

The invention relates to the technical field of textile machinery, in particular to a device and method for actively compensating warp tension based on the fabric structure of a three-dimensional loom.

Background technique

Carbon fiber textile composites have become an important material because of their light weight, high specific stiffness, excellent fatigue properties, and higher corrosion resistance than common metal alloys. Textile composites are widely used in advanced engineering structures such as aerospace, marine, construction, sports, and automobiles. Three-dimensional textile composites overcome the weaknesses of laminated composites such as poor out-of-plane properties, low interlaminar shear strength and low fracture toughness. The monolithic structure of the 3D fabric improves damage tolerance, eliminates delamination that occurs on laminated 2D structures, and can withstand multiaxial mechanical stress. The three-dimensional textiles currently used to reinforce composite materials are mainly organic fabrics, knitted fabrics, braided fabrics and non-woven fabrics. One of the most widely used types is woven composite materials.

When weaving on traditional looms, the warp tension compensation mainly includes mechanical negative compensation and swing back beam compensation based on cam or eccentric wheel control. The structure of the mechanical negative compensation mechanism is complex, there are many connecting rods, and the inertial force and frictional resistance of the parts will affect the sensitivity of warp let-off and tension control, so the vibration is large and the control precision is low, so it is not suitable for high speed. The swinging back beam compensation mechanism can compensate the warp path expansion and contraction changes caused by the movement of the heald frame, and has better control accuracy than the mechanical negative compensation method. It is more practical for yarns with better elastic modulus, but it is not suitable for fibers with poor elasticity, and it is easy to cause damage to yarns. Moreover, the traditional back beam tension adjustment range is small, which belongs to passive compensation.

Chinese patent CN101392427A discloses a three-dimensional loom tension control system. The yarn tension adjustment is realized by changing the sliding surface contact between the steel shaft and the yarn into rolling contact through the rotation of the bearing. However, in this device, the magnitude of the tension is determined by the magnitude of the friction, and the friction itself will damage the yarn, especially the high-performance fiber. At the same time, its tension adjustment is passive adjustment, which cannot be satisfied with the large fluctuation warp tension adjustment.

Chinese patent CN204875008U discloses a warp tension adjusting device of a loom. The back rest is improved. Positive follow-up compensation of heald frame mechanism with variable stroke.

Chinese patent CN102587010A discloses a carbon fiber multi-layer angle chain loom piece yarn tension adjustment device, a tension adjustment bracket is installed on the frame, and a warp let-off roller and a swing tension roller are installed on the adjustment bracket. The spring compresses the swing arm to drive the swing tension roller on the support shaft of the swing arm to compress the yarn so that the yarn is in a taut state. The same is to adjust the tension in a mechanical negative way.

Compared with ordinary fabrics, the weaving of three-dimensional fabrics has multiple openings during the weaving process. For some fabrics, the heald frame often has multiple displacement changes according to different fabrics, which makes warp fluctuations and warp required stretching changes greatly. The tension fluctuates greatly, especially when weaving high-performance fibers such as carbon fibers. Compared with ordinary yarns, high-performance fibers are almost inelastic and not wear-resistant, making the weaving process extremely difficult.

Therefore, the yarn tension compensation method using traditional looms is no longer suitable for the weaving of new three-dimensional looms.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the traditional negative compensation response that is not timely, causing large fluctuations in warp tension, increasing warp and mechanical friction and fluffing, and providing a weaving method that can well adapt to high-performance fibers such as carbon fibers with poor elasticity. , a warp tension compensation device that can meet the compensation requirements of multi-opening three-dimensional looms and the same heald frame requiring frequent stroke changes.

In order to solve the above technical problems, the technical solution of the present invention is to provide a device for compensating the warp tension based on the fabric structure of the three-dimensional loom. Interweaving with the weft yarn to form a fabric; it is characterized in that: the device for compensating the tension of the warp yarn includes a tension roller and its driving device for synchronously compensating the elongation or shrinkage of the warp yarn caused by the up and down movement of the heald frame by moving up and down, each A tension roller is arranged correspondingly to the warp beam, and the warp yarn coming out of the warp beam is U-shaped and bypasses the tension roller, then passes through the layered frame, passes through the heald frame and interweaves with the weft yarn.

Preferably, the two ends of the tension roller are respectively arranged on a correction base, and the correction base is arranged on a carrier; the carrier is arranged on a guide rail, and the carrier can move up and down along the guide rail; the guide rail is arranged on the frame of the three-dimensional loom Above; the electric cylinder and the servo motor used to drive the electric cylinder are set on the frame, and the push rod of the electric cylinder is connected to the carrier.

More preferably, the push rod of the electric cylinder is connected to the carrier through the bottom plate.

More preferably, when the servo motor drives the push rod of the electric cylinder to move up and down, it drives the carrier to move up and down, and the carrier carries the tension roller to move up and down along the guide rail.

A method for compensating warp tension based on the fabric structure of a three-dimensional loom, characterized in that: using the above-mentioned device for compensating warp tension based on the fabric structure of a three-dimensional loom, when controlling the heald frame to move up and down, synchronously control the tension roller up and down Movement, synchronous compensation for warp elongation or shrinkage caused by heald frame moving up and down.

Preferably, the specific steps are:

Step 1: Calculate the warp elongation or shrinkage caused by the opening movement of the corresponding fabric according to the fabric weaving diagram and cardboard diagram corresponding to the required weaving;

Step 2: According to the elongation or shrinkage of the warp yarn caused by the opening movement of the corresponding fabric structure, the movement distance of the tension roller is obtained, and then the rotation direction and movement distance of the servo motor are obtained;

Step 3: According to the rotation direction and stroke of the servo motor obtained in step 2, when the heald frame is moving, synchronously control the tension roller to compensate for the warp let-off, so as to actively compensate the warp elongation or shrinkage caused by the opening of the fabric weave.

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

1. Transform the traditional mechanical compensation into digital compensation, which improves the intelligent control level of the three-dimensional loom;

2. The servo electric tension compensation device composed of servo electric push rod, guide rail, tension roller, etc. is adopted, which simplifies the mechanical structure and facilitates installation;

3. Realize the active compensation of warp stretching, which can overcome the untimely response of negative compensation, causing large fluctuations in warp tension, increasing the warp and mechanical friction fluffing and other problems; it can well adapt to the weaving of high-performance fibers such as carbon fibers with poor elasticity; can meet Three-dimensional looms have multiple openings, and the same heald frame needs to be compensated for frequent changes in travel;

4. The compensation method is active synchronous compensation, which is beneficial to improve the speed and accuracy of compensation, reduce the fluctuation of warp tension, and improve the efficiency of loom and fabric quality.

Description of drawings

Figure 1 is a schematic diagram of a device for compensating warp tension based on the fabric structure of a three-dimensional loom provided in this embodiment;

Figure 2 is a schematic diagram of the assembly between the guide rail, the carrier, and the correction base;

Fig. 3 is a schematic diagram of the compensation device provided by this embodiment installed on the three-dimensional loom;

Fig. 4 is a kind of fabric structure diagram and upper machine pattern; (a) is the fabric structure diagram; (b) is upper machine pattern; (c) is the schematic diagram of drafting;

Fig. 5 is a schematic diagram of the movement of the heald frame and the tension roller.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

FIG. 1 is a schematic diagram of a device for compensating warp tension based on the fabric structure of a three-dimensional loom provided in this embodiment. The device for compensating warp tension based on a fabric structure of a three-dimensional loom includes a guide rail 18, a frame 19, and a carrier 20. , Push rod 21, base plate 22, correction base 23, tension roller 24, electric cylinder 25, servo motor 26, etc.

Both ends of the tension roller 24 are installed on the correction base 23. With reference to Fig. 2, the correction base 23 is installed on the carrier 20; Be fixed on the frame 19 by bolts. The electric cylinder body 25 and the servo motor 26 are fixed on the frame 19, and the servo motor 26 drives the electric cylinder body 25 to work. The push rod 21 of the electric cylinder 25 is connected to the bottom plate 22 by bolts, and the bottom plate 22 is connected to the carrier 20 by bolts.

It can be seen from Fig. 1 that the device for compensating the warp tension based on the fabric structure of the three-dimensional loom provided by this embodiment is a bilaterally symmetrical mechanism. When the servo motor 26 drives the push rod 21 to move up and down, it drives the carrier 20 to move up and down, and the carrier 20 carries the tension roller 24 to move vertically up and down along the guide rail 18 .

The device for compensating warp tension based on the fabric structure of the three-dimensional loom provided in this embodiment is installed on the three-dimensional loom, as shown in FIG. 3 . Eight warp beams 1 to 8 in the let-off system 11 supply yarn, and each warp beam is correspondingly equipped with a tension roller 24 , and the movement of the tension roller 24 is controlled by the corresponding first driver 9 and the first control system 10 . The warp yarn 17 that warp beam comes out is U-shaped and walks around tension roller 24, then through layered frame, passes through heald frame 16 (comprising I, II, III, IV four pages) and single or a plurality of heddle eyes on it, The movement of the heald frame 16 is controlled by the corresponding second driver 11 and the second control system 12 . The heald frame 16 moves up and down to form a shed, the weft yarn 14 interweaves with the warp yarn 17, and the reed 15 beats the weft yarn 14 to the weaving fell to form a fabric 13, and the fabric 13 is drawn away from the weaving heel by a corresponding take-up mechanism.

Wherein, the device composed of the tension roller 24, the first driver 9 and the first control system 10 is the device for actively compensating the warp tension based on the fabric structure of the three-dimensional loom provided in this embodiment.

When the heald frame is controlled to move up and down, the tension roller 24 is synchronously controlled to move up and down to compensate synchronously for warp yarn elongation or shrinkage caused by the heald frame moving up and down.

The control method is as follows:

1. Corresponding to the weaving fabric weave diagram and cardboard diagram, the fabric weave diagram determines the shedding motion requirements in a fabric weave cycle, based on which the elongation or shrinkage of the warp yarn caused by the weaving movement of the corresponding fabric weave can be calculated.

2. According to the elongation or shrinkage of the warp caused by the opening movement of the corresponding fabric structure, the movement distance of the tension roller is obtained, and the rotation direction and movement distance of the servo motor of the warp compensation device are also obtained.

3. According to the rotation direction and stroke of the servo motor of the warp compensation device calculated above, when the upper computer controls the movement of the open heald frame servo motor, through calculation, the corresponding speed and direction signals are synchronously output to control the tension roller to perform warp let-off compensation. Thus, the warp elongation or shrinkage caused by shedding is actively compensated.

Taking a multi-layer fabric loop as an example, combined with the tension compensation device and control method, the features of the present invention and the kinematic coordination relationship between the various components are described.

For a multi-layer fabric as shown in Figure 4, when the first weft yarn is introduced, the heald frames on the first and third pages are raised to a height. Due to the high rigidity of carbon fibers and poor resilience, after the completion of the first weft weaving, the shed occurs. Change; when the second weft yarn is introduced, the heald frames on the second and fourth pages are raised to a certain height, and the warp yarns controlled by the heald frames on the first and third pages return to the heald level position, and the warp yarn tension decreases, resulting in uneven warp yarn tension and uneven shedding. Clear, difficult to weave. Therefore, when the heald frames on the second and fourth pages are raised to a certain height, in order to ensure that the warp tension remains constant, it is necessary to increase the let-off amount of the warp yarns on the heald frames. When the heald frames on the first and third pages return to the heald flat state, in order to ensure that the warp tension remains unchanged, the warp must be rolled back.

It can be seen from Figure 2(a) of the fabric structure that 8 warp beams are used. Each warp beam corresponds to a group of warp yarns in the weave. Four heald frames are required, and the method of passing through is adopted, and there are two heald eyes on the heald wire. Fig. 2(b) is a pattern diagram of the fabric, and Fig. 2(c) is a schematic diagram of drafting. The lifting height of the multi-eye heald heald frame must be an integer multiple of the distance between the heald eyes.

When the fabric weave is drawing the first weft, as shown in Figure 2(b), the heald frame I and the heald frame III need to be raised to a height relative to the flat position of the heald, and move from position A' to position B' (as shown in Figure 5), and Warp elongation, calculating the movement distance of the tension roller, and obtaining the movement distance and rotation direction of the servo motor, and then the host computer sends out a signal synchronously to control the servo motor, so that the tension rollers 1', 3', 5 corresponding to the warp thread worn on the heald frame ', 7' (as shown in Figure 3) move upward from position A to position B as shown in Figure 5 for compensation; heald frame II and heald frame IV are in the heald flat state, and the corresponding tension roller positions remain unchanged.

When drawing the second weft, the heald frame II and the heald frame IV are raised by a height relative to the previous weft, and move from position A' to B' to obtain the elongation of the warp, calculate the stroke of the tension roller, and obtain the stroke of the servo motor and direction of rotation. At this time, the host computer should send a signal synchronously to control the servo motor, so that the tension rollers 2', 4', 6', and 8' corresponding to the warp thread worn on the heald frame move upward from position A to position B; III is in the shed level position, descending a height relative to the previous weft, from position B' to position A', get the shrinkage of the warp, calculate the movement distance of the tension roller, and obtain the movement distance and rotation direction of the servo motor. At this time, the host computer should send a signal synchronously to control the servo motor, so that the corresponding tension rollers 1', 3', 5', 7' move down from position B to position A.

When drawing the third weft yarn, the heald frame I is raised two heights, moves upward from position A' to position C', obtains the elongation of the warp yarn, calculates the movement distance of the tension roller, and obtains the movement distance and rotation direction of the servo motor. At the same time, the host computer should send a signal to control the servo motor at the same time, so that the corresponding tension roller 1', 5' moves upward from position A to position C for compensation; the position of heald frame 2 remains unchanged, and the corresponding tension roller does not need to move; The heald frame 3 moves from position A' to position B' to obtain the elongation of the warp yarn, calculate the movement distance of the tension roller, and obtain the movement distance and rotation direction of the servo motor. Corresponding tension rollers 3', 7' move from position A to position B; heald frame 4 moves from position B to position A, get warp shrinkage, calculate tension roller movement, get servo motor movement and rotation direction , at this time, the host computer should send a signal synchronously to control the servo motor, so that the corresponding tension rollers 4' and 8' move from position B' to position A'.

When the fourth weft yarn is introduced, the position of the heald frame I moves from B' to A', and the height of the previous weft is lowered by one height, and the shrinkage of the warp is obtained, and the movement of the tension roller is calculated, and the movement and rotation of the servo motor are obtained. At this time, the host computer should send a signal synchronously to control the servo motor, so that the corresponding tension rollers 1' and 5' should move from position B to position A; the height of heald frame II is C', which is increased by one height compared to the previous weft. At this time, the host computer should simultaneously send a signal to control the servo motor, so that the tension roller moves from position B to position C; the heald frame III is at the heald level position A, and it is lowered by a height relative to the previous weft heald frame, and the shrinkage of the warp yarn is calculated. The movement distance of the tension roller can be obtained from the movement distance and rotation direction of the servo motor. At this time, the host computer should send a signal to control the servo motor at the same time, so that the corresponding tension roller needs to move from position B to position A; Height, located at position B', to obtain the warp elongation, calculate the tension roller movement, and obtain the servo motor movement and rotation direction. At this time, the host computer should send a signal to control the servo motor at the same time, so that the corresponding tension roller moves from the position A rises to position B.

When drawing the fifth weft yarn, the heald frame I moves from the position B' of the last weft to the position C', lifts up a height relative to the last weft, obtains the elongation of the warp yarn, calculates the movement distance of the tension roller, and obtains the servo Motor stroke and rotation direction. At this time, the host computer should send a signal to control the servo motor at the same time, so that the corresponding tension roller rises from position B to position C; the heald frame II descends from position C' of the last weft to position B', so that Out of the warp shrinkage, calculate the movement distance of the tension roller, and obtain the movement distance and rotation direction of the servo motor. At this time, the host computer should send a signal to control the servo motor synchronously, so that the corresponding tension rollers 2' and 6' are synchronously lowered from position C to position B; The heald frame III rises from the position A' of the last weft to the position C' to obtain the elongation of the warp, calculate the movement distance of the tension roller, and obtain the movement distance and rotation direction of the servo motor. The signal controls the servo motor so that the corresponding tension rollers 3' and 7' rise from position A to position C for compensation; the position of the heald frame IV remains unchanged relative to the previous weft, and no compensation is required.

When drawing the sixth weft, the heald frame I is lowered from the position C' of the previous weft to the position B', and the shrinkage of the warp yarn is obtained, and the movement distance of the tension roller is calculated to obtain the movement distance and rotation direction of the servo motor. At the same time, a signal is sent to control the servo motor, so that the corresponding tension rollers 1' and 5' move downward from position C to position B; the heald frame II rises from position B' to position C' relative to the previous weft, and the warp elongation is obtained. Calculate the movement distance of the tension roller to obtain the movement distance and rotation direction of the servo motor. At this time, the host computer should send a signal to control the servo motor at the same time, so that the corresponding tension roller 2' and 6' rise from position B to position C; The warp yarn is lowered from position C' to position B' relative to the previous weft, and the shrinkage of the warp yarn is obtained, and the movement distance of the tension roller is calculated to obtain the movement distance and rotation direction of the servo motor. At this time, the host computer should simultaneously send a signal to control the servo motor. The corresponding tension rollers 3' and 7' are lowered from position C to position B; the heald frame IV is raised from position B' to position C' relative to the previous weft, and the elongation of the warp is obtained, and the movement distance of the tension roller is calculated to obtain Servo motor stroke and rotation direction. At this time, the host computer should send a signal to control the servo motor at the same time, so that the corresponding tension rollers 4' and 8' rise from position B to position C. At this time, a fabric weave cycle is completed, and the tension roller is compensated for the weaving of the fabric weaving.

Tests have shown that after the compensation device of the present invention is installed, the warp tension is actively compensated based on the fabric structure, which can overcome the problems of untimely response of traditional negative compensation, large fluctuations in warp tension, increased warp and mechanical friction and fluffing, etc., and can be well It is suitable for the weaving of high-performance fibers such as carbon fibers with poor elasticity, and can meet the compensation requirements of multi-opening three-dimensional looms and frequent stroke changes of the same heald frame. It is beneficial to improve the speed and accuracy of compensation, reduce warp tension fluctuations, and improve loom efficiency and fabric quality.

The invention is suitable for warp tension compensation in the weaving process of three-dimensional fabrics with various organizational structures, especially for the weaving of high-performance fibers such as carbon fibers. It is also suitable for warp tension compensation on conventional looms. This device can replace the backrest device on traditional looms.

Claims (6)

1. a kind of device compensated to warp tension based on three-dimensional loom fabric tissue, three-dimensional loom includes warp beam, warp beam Warp thread (17) out interweaves by layering frame, through heald frame (16) and weft yarn (14), forms fabric；It is characterized in that：It is described The device compensated to warp tension includes moving up and down heald frame (16) for moving up and down the warp thread for causing elongation or receives The jockey pulley (24) and its drive device of row synchroballistic are retracted, each warp beam is corresponding to set a jockey pulley (24), warp Axle warp thread (17) out is U-shaped to bypass jockey pulley (24), then by layering frame, through heald frame (16) and weft yarn (14) hands over Knit.

2. a kind of device compensated to warp tension based on three-dimensional loom fabric tissue as claimed in claim 1, it is special Levy and be：The two ends of the jockey pulley (24) are respectively arranged on a correction base (23), and correction base (23) is located at carrier (20) On；On guide rail (18), carrier (20) can be moved up and down carrier (20) along guide rail (18)；Guide rail (18) is located at three-dimensional loom In frame (19)；Electronic cylinder body (25) and the servomotor (26) for driving electronic cylinder body (25) to work are located at frame (19) On, the push rod (21) of electronic cylinder body (25) is connected with carrier (20).

3. a kind of device compensated to warp tension based on three-dimensional loom fabric tissue as claimed in claim 2, it is special Levy and be：The push rod (21) of the electronic cylinder body (25) is connected by base plate (22) with carrier (20).

4. a kind of device compensated to warp tension based on three-dimensional loom fabric tissue as claimed in claim 2, it is special Levy and be：When the servomotor (26) drives the push rod (21) of electronic cylinder body (25) to move up and down, carrier (20) is driven up and down Mobile, carrier (20) carries jockey pulley (24) and is moved up and down along guide rail (18).

5. a kind of method compensated to warp tension based on three-dimensional loom fabric tissue, it is characterised in that：Using such as right It is required that the device compensated to warp tension based on three-dimensional loom fabric tissue described in 1~4 any one, in control heald frame (16) when moving up and down, Synchronization Control jockey pulley (24) move up and down, heald frame (16) is moved up and down cause warp thread elongation or Contraction carries out synchroballistic.

6. as claimed in claim 5 to be based on the method that three-dimensional loom fabric tissue is compensated to warp tension, its feature exists In concretely comprising the following steps：

Step 1：Correspondence requires woven fabric organization chart and pegging plan, and calculating correspondence fabric tissue according to fabric organization chart opens Warp thread elongation or amount of contraction that mouth motion is caused；

Step 2：The warp thread elongation or amount of contraction caused according to correspondence fabric tissue harness motion, show that jockey pulley (24) is moved Journey, and then draw the rotation direction and traverse of servomotor (26)；

Step 3：The rotation direction and traverse of the servomotor (26) drawn according to step 2, when heald frame (16) is moved, synchronous control Jockey pulley (24) processed carries out warp let-off compensation, so as to the warp thread elongation or amount of contraction active compensation that are caused to fabric tissue opening.