Yarn carrier of composite material three-dimensional weaving prototype and weaving method

Abstract

The invention discloses a composite material three-dimensional weaving prototype yarn carrier and a weaving method. The composite material three-dimensional weaving prototype yarn carrier comprises a yarn storage pipe, a yarn carrier base, a yarn winding and unwinding unit, a yarn guide unit and a tension control unit. The yarn guide unit comprises a yarn outlet, a movable pulley block, a fixed pulley block and a sliding rod, the yarn winding and unwinding unit comprises a pattern wheel installed below a yarn storage pipe, a direct current motor installed in a yarn carrier base and a forward / reverse rotation switch, and the tension control unit comprises a tension spring and a pair of permanent magnets; during knitting, yarn is led out from the yarn storage tube, wound on the pulley block and then penetrates out of the yarn outlet. When the tension of the yarn is increased, the sliding block ascends until the forward rotation switch is closed, and the direct current motor rotates forwards to complete yarn releasing; when the yarn tension is reduced, the permanent magnet pulls the sliding block to move downwards until the reverse switch is closed, and the direct current motor rotates reversely to complete yarn collection. The yarn carrier is light in size and longer in endurance, knitting faults such as yarn breaking, fuzzing, yarn falling and drooping are avoided during knitting, and the quality of a knitted prefabricated body is improved.

Description

Technical Field

[0001] This invention relates to the field of composite material weaving technology, specifically to a three-dimensional composite material weaving prototype yarn carrier and weaving method. Background Technology

[0002] The yarn carrier is an indispensable core component in the three-dimensional weaving process of composite materials. It is responsible for the storage and supply of yarn and participates in key aspects such as yarn feeding, yarn take-up, and tension control in three-dimensional weaving.

[0003] Currently, the market offers a full range of yarn carriers in terms of type, structure, and size, with mature solutions available for problems such as low yarn capacity, limited yarn throwing distance, and difficulties in yarn take-up and unwinding. However, existing yarn carriers struggle to stably control yarn tension during weaving. Excessive tension can lead to yarn fuzzing and breakage, while insufficient tension can cause yarn sagging and unwinding, affecting the quality of the preform and the safety of the weaving equipment. Summary of the Invention

[0004] Purpose of the invention: This invention provides a yarn carrier and weaving method for a three-dimensional composite material weaving prototype, solving the problem of tension control in the existing yarn carrier.

[0005] Technical Solution: The present invention proposes a yarn carrier for a three-dimensional composite material weaving prototype, comprising a yarn carrier base, a yarn storage tube located on the yarn carrier base, a yarn outlet, a fixing block fixed at the yarn outlet, a fixed pulley assembly installed on the outside of the fixing block, a first sliding rod installed between the fixing block and the yarn carrier base, a sliding block sleeved on the first sliding rod, and a movable pulley assembly installed on the outside of the sliding block; a tension spring is sleeved on the first sliding rod, one end of the tension spring abutting against the sliding block and the other end abutting against the fixing block, a first permanent magnet is provided at the bottom of the sliding block, and a second permanent magnet is provided on the yarn carrier base, the first permanent magnet and the second permanent magnet attracting each other; a driver for driving the yarn storage tube to rotate forward or backward is provided inside the yarn carrier base.

[0006] Preferably, it further includes a second sliding rod installed between the fixed block and the yarn carrier base and parallel to the first sliding rod, and the sliding block is slidably disposed on both the first and second sliding rods.

[0007] Preferably, a forward switch and a reverse switch are also provided; the forward switch includes a forward contact mounted on the second sliding rod and a forward contact piece mounted on the top of the sliding block; the reverse switch includes a reverse contact mounted on the bottom of the sliding block and a reverse contact piece mounted on the top of the yarn carrier base.

[0008] Preferably, the driver includes a DC motor and a pattern wheel. The base of the yarn carrier is provided with a DC motor and a pattern wheel located above the DC motor. The DC motor is connected to the pattern wheel via a coupling. The pattern wheel is located at the bottom of the yarn storage tube.

[0009] Preferably, when the forward switch is closed, the DC motor rotates forward to feed the yarn, and when the reverse switch is closed, the DC motor rotates in reverse to take in the yarn.

[0010] Preferably, the movable pulley group includes three pulleys and pulley shafts, and the fixed pulley group also includes three pulleys and pulley shafts.

[0011] A weaving method using a yarn carrier for a three-dimensional composite material weaving prototype includes the following steps: During weaving, the yarn is drawn from the yarn storage tube, wound sequentially around a movable pulley group and a fixed pulley group, and then exits from the yarn outlet. When the yarn tension increases, the movable pulley group moves upward, and the tension spring is compressed until the forward rotation contact contacts the forward rotation contact piece. When the forward rotation switch is closed, the DC motor drives the yarn storage tube to rotate forward to complete the yarn release. At this time, the yarn tension decreases, the tension spring extends, and the sliding block moves downward. When the yarn tension is less than a specific value, the first permanent magnet pulls the sliding block downward until the reverse rotation contact contacts the reverse rotation contact piece. When the reverse rotation switch is closed, the DC motor reverses to complete the yarn take-up, and the yarn tension increases.

[0012] Preferably, during weaving, the upward force F generated by the yarn on the sliding block and the length l0 of the tension spring satisfy the following relationship:

[0013]

[0014] In the formula, n0 is the number of times the yarn wraps back and forth, and F S denoted as yarn tension, r as pulley radius, and l1 as the distance between pulleys in the same group.

[0015] Preferably, during weaving, the attractive force F generated between the first permanent magnet and the second permanent magnet... C The length l0 of the tension spring satisfies the following relationship:

[0016]

[0017] In the formula, μ0 is the permeability of vacuum, m1 and m2 are the magnetic moments of the two permanent magnets, l is the original length of the tension spring, and θ is the angle between the magnetic moments of the two permanent magnets.

[0018] Preferably, during weaving, when the sliding block is in equilibrium, the yarn tension F S The length l0 of the tension spring satisfies the following relationship:

[0019]

[0020] In the formula, k is the spring constant of the tension spring.

[0021] Beneficial effects: (1) By setting up a yarn tension control unit composed of a tension spring and a permanent magnet, the present invention can supplement the yarn tension, stabilize the yarn tension fluctuation range, avoid weaving failures such as yarn breakage, pilling, yarn shedding and sagging, and improve the quality of the woven preform; (2) By setting up a cooperative structure of a moving pulley group, a sliding rod, a sliding block and a forward / reverse switch, the present invention can automatically adjust the position of the sliding block according to the yarn tension during the weaving process to close or open the forward / reverse switch, thereby realizing the active yarn feeding and tension adjustment of the yarn carrier; (3) By setting up a cooperative structure of a yarn storage tube, a pattern wheel, a coupling and a DC motor, the present invention can prevent the yarn storage tube from slipping during the weaving process, which would cause the yarn to fall off, and ensure the normal operation of the weaving equipment; (4) Compared with the active yarn carrier that uses a PLC scheme to control the tension, the yarn carrier provided by the present invention is lightweight and has a longer battery life. Attached Figure Description

[0022] Figure 1 This is an overall schematic diagram of the yarn carrier of the present invention;

[0023] Figure 2 This is a schematic diagram of the yarn guiding unit of the yarn carrier of the present invention;

[0024] Figure 3 This is a schematic diagram of the yarn take-up and release unit of the yarn carrier of the present invention;

[0025] Figure 4 This is a schematic diagram of the tension control unit of the yarn carrier of the present invention;

[0026] Figure 5 This is a schematic diagram of the yarn tension in the yarn carrier of the present invention;

[0027] Figure 6 The yarn tension F in this invention S Curve relationship F between the length l0 of the tension spring and the tension spring. S =f(l0) schematic diagram. Detailed Implementation

[0028] Example 1

[0029] like Figure 1 As shown, this embodiment provides a yarn carrier for a three-dimensional composite material weaving prototype, including a yarn carrier body and a yarn carrier base 1, a yarn storage tube 2, a yarn guiding unit, a yarn take-up and release unit, and a tension control unit disposed on the yarn carrier body. The yarn carrier base 1 is located at the bottom of the yarn carrier body, and the yarn storage tube 2 is located in the middle of the yarn carrier body.

[0030] like Figure 2As shown, the yarn guiding unit of the yarn carrier is located on one side of the yarn carrier body and is mounted on the yarn carrier base 1. It includes a yarn outlet 3 mounted on the top of the yarn carrier, a movable pulley group 4, a fixed pulley group 5, a sliding block 6, and a fixed block 7. The movable pulley group 4 and the fixed pulley group 5 have similar structures, both consisting of three pulleys and pulley shafts. The fixed pulley group 5 is mounted on the fixed block 7 near the yarn outlet 3, and the movable pulley group is mounted on the sliding block 6 away from the yarn outlet 3, and can move up and down with the sliding block. The yarn guiding unit also includes a first sliding rod 8 and a second sliding rod 9 sleeved between the movable pulley group 4 and the fixed pulley group 5. One end is fixed inside the fixed block 7, and the other end is inserted into the yarn carrier base 1, serving as a guide for the movement of the sliding block 6.

[0031] like Figure 3 As shown, the yarn take-up and release unit of the yarn carrier is located at the bottom of the main body of the yarn carrier, and includes a pattern wheel 10, a DC motor 11, a forward switch 12, a reverse switch 13, and a coupling 14. The pattern wheel 10 is installed at the bottom of the yarn storage tube 2 and engages with the key at the bottom of the yarn storage tube 2 via a spline. It plays a limiting and driving role during weaving, preventing the yarn storage tube 2 from slipping or vibrating and causing the yarn to fall off. The DC motor 11 is connected to the pattern wheel 10 via the coupling 14. The forward switch 12 includes a forward contact 121 installed on the first sliding rod 9 and a forward contact piece 122 installed on the top of the sliding block 6. The reverse switch 13 includes a reverse contact 131 installed on the bottom of the sliding block 6 and a contact piece 132 installed on the top of the yarn carrier base 1. The start and stop are controlled by the forward switch 12 and the reverse switch 13. When the forward switch 12 is closed, that is, the forward contact 121 contacts the forward contact piece 122, and the DC motor 11 rotates forward to feed the yarn. When the reverse switch 13 is closed, that is, the reverse contact 131 contacts the reverse contact piece 132, and the DC motor 11 rotates in reverse to take in the yarn.

[0032] like Figure 4 As shown, the tension control unit of the yarn carrier is located on one side of the yarn carrier body, including a tension spring 15, a first permanent magnet 16 installed at the bottom of the sliding block 6 and a second permanent magnet 17 installed at the top of the yarn carrier base 1, which can compensate for insufficient yarn tension.

[0033] Example 2

[0034] This embodiment provides a weaving method for the yarn carrier of the composite material three-dimensional braiding prototype in Embodiment 1. For example... Figure 5 As shown, the yarn is drawn from the yarn storage tube 2, wound around the movable pulley group 4 and the fixed pulley group 5, and then exits from the yarn outlet 3. When the yarn tension increases, the movable pulley group 4 moves upward, and the tension spring 15 is compressed until the forward rotation switch 12 is closed. The DC motor 11 drives the yarn storage tube 1 to rotate forward and release the yarn. At this time, when the yarn tension decreases, the tension spring 15 extends, and the sliding block moves downward.

[0035] During weaving, the upward force F exerted by the yarn on the sliding block 6 and the length l0 of the tension spring 15 satisfy the following relationship:

[0036]

[0037] In the formula, the number of times the yarn wraps back and forth, n0, is 3, and F S denoted as yarn tension, r as pulley radius, and l1 as the distance between pulleys in the same group.

[0038] The attractive force F generated by the permanent magnet C The length l0 of the tension spring satisfies the following relationship:

[0039]

[0040] In the formula, μ0 is the permeability of vacuum, m1 and m2 are the magnetic moments of the two permanent magnets, l is the original length of the tension spring 15, and θ is the angle between the magnetic moments of the two permanent magnets.

[0041] like Figure 6 As shown, when the sliding block is in equilibrium, the yarn tension F S The length l0 of the tension spring satisfies the following relationship:

[0042]

[0043] In the formula, k is the elastic coefficient of the tension spring 15. When the yarn tension is lower than F... S min When the permanent magnet 16 pulls the sliding block 6 downwards quickly, the reversing switch 13 closes, the DC motor 11 reverses to tighten the yarn, and the sliding block moves upwards, and the yarn carrier enters the normal weaving state.

[0044] Based on the yarn tension requirements during the weaving process, this embodiment selects a magnetic moment of 5 Am. 2 Permanent magnets 16 and 17 have an elastic modulus of 300 N / m. Tension spring 15 has an original length of 135 mm. The specified length range for the tension spring during weaving is 50-127.5 mm. The yarn tension F is calculated. S The range of variation is 1.10-4.25N.

[0045] This invention utilizes a yarn tension control unit composed of a tension spring and a permanent magnet to supplement yarn tension, stabilize yarn tension fluctuations, and prevent weaving defects such as yarn breakage, pilling, yarn slippage, and sagging, thereby improving the quality of the woven preform. Simultaneously, a cooperative structure consisting of a movable pulley group, a sliding block, a sliding rod, and a forward / reverse switch is incorporated. During weaving, the sliding block automatically adjusts its position according to the yarn tension, causing the forward / reverse switch to close or open, enabling active yarn feeding and tension adjustment by the yarn carrier. Furthermore, a cooperative structure involving a yarn storage tube, a pattern wheel, a coupling, and a DC motor prevents the yarn storage tube from slipping during weaving, thus preventing yarn scattering and ensuring the normal operation of the weaving equipment. Finally, compared to active yarn carriers that use PLC-controlled tension, the yarn carrier provided by this invention is compact and has a longer operating time.

Claims

1. A yarn carrier for a three-dimensional braiding prototype of a composite material, characterized in that, The device includes a yarn carrier base (1), a yarn storage tube (2) located on the yarn carrier base (1), a yarn outlet (3), a fixing block (7) fixed at the yarn outlet (3), a fixed pulley group (5) installed on the outside of the fixing block (7), a first sliding rod (8) installed between the fixing block (7) and the yarn carrier base (1), a sliding block (6) sleeved on the first sliding rod (8), and a movable pulley group (4) installed on the outside of the sliding block (6); a tension spring (15) is sleeved on the first sliding rod (8), one end of the tension spring (15) abuts against the sliding block (6) and the other end abuts against the fixing block (7), a first permanent magnet (16) is provided at the bottom of the sliding block (6), and a second permanent magnet (17) is provided on the yarn carrier base (1), and the first permanent magnet (16) and the second permanent magnet (17) attract each other; the yarn carrier base (1) is provided with a driver to drive the yarn storage tube (2) to rotate forward or backward.

2. The yarn carrier for a three-dimensional composite material weaving prototype according to claim 1, characterized in that, It also includes a second sliding rod (9) installed between the fixed block (7) and the yarn carrier base (1) and parallel to the first sliding rod (8), and the sliding block (6) is simultaneously slidably disposed on the first sliding rod (8) and the second sliding rod (9).

3. The yarn carrier for a three-dimensional composite material braiding prototype according to claim 2, characterized in that, It is also provided with a forward switch (12) and a reverse switch (13); the forward switch includes a forward contact (121) installed on the second sliding rod (9) and a forward contact piece (122) installed on the top of the sliding block (6); the reverse switch (13) includes a reverse contact (131) installed on the bottom of the sliding block (6) and a reverse contact piece (132) installed on the top of the yarn carrier base (1).

4. The yarn carrier for a three-dimensional composite material weaving prototype according to claim 1, characterized in that, The driver includes a DC motor (11) and a pattern wheel (10). The yarn carrier base (1) is equipped with a DC motor (11) and a pattern wheel (10) located above the DC motor (11). The DC motor (11) is connected to the pattern wheel (10) via a coupling (14). The pattern wheel (10) is located at the bottom of the yarn storage tube (2).

5. The yarn carrier for a three-dimensional composite material braiding prototype according to claim 4, characterized in that, When the forward switch (12) is closed, the DC motor (11) rotates forward to release the yarn, and when the reverse switch (13) is closed, the DC motor (11) rotates in reverse to retract the yarn.

6. The yarn carrier for a three-dimensional composite material weaving prototype according to claim 1, characterized in that, The movable pulley group (4) includes three pulleys and pulley shafts, and the fixed pulley group (5) also includes three pulleys and pulley shafts.

7. A weaving method using the yarn carrier of a three-dimensional composite material weaving prototype according to any one of claims 1-5, characterized in that, The process includes the following steps: When weaving, the yarn is drawn out from the yarn storage tube (2), wound around the movable pulley group (4) and the fixed pulley group (5) in sequence, and then passed out from the yarn outlet (3). When the yarn tension increases, the movable pulley group (4) moves upward, and the tension spring (15) is compressed until the forward contact (121) contacts the forward contact piece (122). When the forward switch (12) is closed, the DC motor (11) drives the yarn storage tube (12) to rotate forward to complete the yarn release. At this time, the yarn tension decreases, the tension spring (15) extends, and the sliding block (6) moves downward. When the yarn tension is less than a specific value, the first permanent magnet (16) pulls the sliding block (6) downward until the reverse contact (131) contacts the reverse contact piece (132). When the reverse switch (13) is closed, the DC motor (11) reverses to complete the yarn take-up, and the yarn tension increases.

8. The weaving method for the yarn carrier of a three-dimensional composite material weaving prototype according to claim 7, characterized in that, During weaving, the upward force F exerted by the yarn on the sliding block (6) and the length l0 of the tension spring (15) satisfy the following relationship: In the formula, n0 is the number of times the yarn wraps back and forth, and F S denoted as yarn tension, r as pulley radius, and l1 as the distance between pulleys in the same group.

9. The weaving method for the yarn carrier of a three-dimensional composite material weaving prototype according to claim 7, characterized in that, During weaving, the attractive force F generated between the first permanent magnet (16) and the second permanent magnet (17) C The length l0 of the tension spring (15) satisfies the following relationship: In the formula, μ0 is the permeability of vacuum, m1 and m2 are the magnetic moments of the two permanent magnets, l is the original length of the tension spring (15), and θ is the angle between the magnetic moments of the two permanent magnets.

10. The weaving method for the yarn carrier of a three-dimensional composite material weaving prototype according to claim 9, characterized in that, During weaving, when the sliding block is in equilibrium, the yarn tension F S The length l0 of the tension spring (15) satisfies the following relationship: In the formula, k is the elastic coefficient of the tension spring (15).

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