A three-dimensional braiding method for multi-port pipes

Abstract

This invention discloses a three-dimensional braiding method for multi-channel tubes. The method uses a yarn reduction technique to braid the multi-channel tubes, which is simple to operate and can achieve integrated braiding of multi-channel tubes. It achieves one-time forming and overall dimensional braiding, avoiding secondary connection processes, improving the stability and impact resistance of the braided structure, and can braid irregularly shaped fabrics of any thickness and shape as needed, with a wide range of applications.

Description

Technical Field

[0001] This invention relates to the field of three-dimensional braided material technology, specifically to a three-dimensional braiding method for multi-channel tubes. Background Technology

[0002] Currently, the main molding technologies for multi-port tubes include traditional winding methods, lay-up molding methods, and three-dimensional integral molding processes that form a reinforcing skeleton through weaving, knitting, and braiding. However, due to the complexity of the multi-port tube shape, the processes using fiber winding or fabric lay-up and braiding are cumbersome, have low automation levels, and produce unsatisfactory product quality, making them unsuitable for use as high-strength connecting tubes. Woven tubes perform reasonably well with smaller wall thicknesses, but as the size increases, the number of fabric layers and warp density increase, leading to adhesion and friction between warp yarns, potentially resulting in unclear openings and uneven tension between upper and lower warp yarns. Knitted fabrics, due to their lower structural strength, poor dimensional stability, and the susceptibility of yarn damage during processing, are also unsuitable as primary load-bearing components.

[0003] Three-dimensional braiding, as a key forming technology for high-performance advanced reinforced structural components, possesses unique near-net-shape advantages, enabling the precise weaving of various complex irregular shapes, such as T-beams, I-beams, variable cross-section braided tubes, and square tubes, thereby significantly improving the mechanical strength of materials. However, most braiding machines on the market today are limited to weaving single-branch tubular fabrics, which greatly restricts the diversity and complexity of products, especially for some special products, such as T-shaped tubes and multi-shaped tubes, which are tubular braided fabrics with branched structures. Chinese patent "Multi-way Round Tube and its Endless Yarn-Adding Integral Braiding Method and Application" (Publication No. CN116555977A) provides a multi-way round tube (three-way round tube, four-way round tube, five-way round tube, six-way round tube) and its endless yarn-adding integral braiding method. It can design and prepare near-net-shape round tube connectors in multiple forming directions, replacing laminated composite material joints that are directly processed or co-cured with metal inserts. It has a higher specific strength than metal materials. However, in other branches of the braiding mold, the yarn-drawing and yarn-adding method is used to braid branch tubes in other forming directions, which is relatively complicated in operation and not conducive to mass production. Summary of the Invention

[0004] The purpose of this invention is to provide a three-dimensional braiding method for multi-channel tubes. This method is simple to operate, enables integrated braiding of multi-channel tubes, achieves one-time forming and overall dimensional braiding, avoids secondary connection processes, improves the stability and impact resistance of the braided structure, and can braid irregularly shaped fabrics of any thickness and shape as needed, thus having a wide range of applications.

[0005] To achieve the above objectives, the solution of the present invention is:

[0006] A three-dimensional braiding method for multi-port tubes includes the following steps:

[0007] Step 1: Determine the preferred braiding direction for the multi-port tubing:

[0008] 1.1 First, assemble the braiding mold according to the shape of the multi-port pipe. Then, fix the braiding mold on the braiding fixture and then fix the braiding fixture on the braiding beam. Select the direction in which the multi-port pipe is first braided, and record it as the preferred braiding direction. The number of preferred braiding directions is ≥2 and does not exceed the number of branch pipes of the multi-port pipe.

[0009] 1.2 Arrange the yarns on the yarn carriers of the corresponding braiding machines according to the number of preferred braiding directions. Divide the yarns on each braiding machine into two braiding areas, with the direction of each braiding machine being closer to each other as the inner and the direction of each braiding machine being farther away as the outer. According to the pattern of yarn weaving, the innermost and outermost layers of yarns in each braiding area are set as stationary rows, that is, the yarns on the stationary rows do not participate in the movement during braiding. The row represents the number of layers of the multi-pass tube, denoted by m. The column represents the number of yarn columns required for the length of the multi-pass tube after flattening in the braiding direction, denoted by n. The values ​​of n and m are both greater than 0. The total number of yarns for each braiding machine is N = n × (m + 1).

[0010] Step 2, Preferred knitting direction:

[0011] 2.1 After the yarn is woven, it is set to the original state. First, the yarn carriers on adjacent columns of each braiding machine move in opposite directions.

[0012] 2.2 Then the yarn carriers on adjacent rows move in opposite directions. At this time, the stationary rows do not participate in the movement. Then the yarn is changed. The inner layer yarns of the two weaving areas of each weaving machine are swapped with the inner layer yarns, and the outer layer yarns are swapped with the outer layer yarns. The yarns of the stationary rows are not changed. After the yarn change is completed, the third step is performed.

[0013] The yarn movement directions in 2.3 and 2.1 are opposite;

[0014] 2.4 The yarn movement direction is opposite to that in 2.2. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0015] The yarn movement directions are opposite in 2.5 and 2.3;

[0016] 2.6 The yarn movement direction is opposite to that in 2.4. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0017] In 2.7 and 2.5, the yarns move in opposite directions;

[0018] The yarn movement direction is opposite to that in 2.8 and 2.6. Then, the yarn is changed. The yarn changing operation is the same as that in 2.2.

[0019] After the yarn carrier moves through the above eight steps, the yarn completes a cycle on the chassis of the braiding machine. The above eight braiding steps are repeated and supplemented by the corresponding manual "tightening" process to make the yarn intertwine together until the predetermined length of the preferred braiding direction is reached, thus completing the braiding of the corresponding branch tubes of the multi-channel tube.

[0020] Step 3, Braiding at the junction of multiple pipes:

[0021] 3.1 As the yarns in each preferred weaving direction are woven to the junction of the multi-pass tube, since the shape of the junction of the multi-pass tube is different from that of each branch tube and the size is also different, the method of overall yarn change plus alternating weaving is adopted. The yarns in the weaving area on the inner side of one weaving machine are transferred and exchanged with the yarns in the weaving area on the inner side of another weaving machine.

[0022] 3.2 Then perform step 2 on one of the knitting machines, and then perform step 2 on the other knitting machine to complete the knitting of the remaining knitting area;

[0023] Step 4: Knitting in the remaining directions:

[0024] Then, after the yarn has finished weaving the junction of the multi-channel tubes, each braiding machine reduces half of the yarn by reducing yarn in a "one-off" manner. Then, the remaining half of the yarn on each braiding machine is moved to the corresponding position of another braiding area on the same braiding machine by a yarn transfer method. The remaining braiding direction is continued according to step 2 until the predetermined length of the remaining braiding direction is reached, thus completing the weaving of the remaining branch tubes of the multi-channel tube.

[0025] Step 5: Remove the braiding mold to obtain the multi-port pipe.

[0026] The multi-way pipe is a tee pipe, a four-way pipe, a five-way pipe, or a six-way pipe.

[0027] The cross-section of the multi-port pipe is circular, square, or rhomboid.

[0028] The yarn is one or more of carbon fiber, silicon carbide fiber, silicon nitride fiber and aramid fiber.

[0029] The multi-port pipe is a tee pipe, and two braiding machines are required. The preferred number of braiding directions is two, which are denoted as the first braiding direction and the second braiding direction. The remaining braiding directions are denoted as the third braiding direction.

[0030] The multi-way pipe is a four-way pipe, and two braiding machines are required. The preferred number of braiding directions is two, which are denoted as the first braiding direction and the second braiding direction. The remaining braiding directions are denoted as the third braiding direction and the fourth braiding direction. Then, step 4 is replaced by: continuing to braid the remaining braiding directions according to step 2 until the predetermined length of the remaining braiding directions is reached, thus completing the braiding of the remaining branch pipes of the multi-way pipe.

[0031] The multi-way tube is a five-way tube, requiring 3 braiding machines. The preferred number of braiding directions is 3, denoted as the first braiding direction, the second braiding direction, and the third braiding direction. The remaining braiding directions are denoted as the fourth braiding direction and the fifth braiding direction. Then, step 4 is replaced by a uniform reduction of yarn in an "alternating one" manner, reducing the yarn in one of the braiding directions. At this time, the braiding machine corresponding to the third braiding direction stops braiding. Then, the remaining yarn in the braiding machine corresponding to the third braiding direction is moved by a yarn shifting method, moving the yarn of one braiding area to the corresponding position of the remaining braiding machine, and moving the yarn of another braiding area to the corresponding position of the remaining braiding machine. The remaining braiding directions are continued according to step 2 until the predetermined length of the remaining braiding directions is reached, thus completing the braiding of the remaining branch tubes of the multi-way tube.

[0032] The multi-way pipe is a six-way pipe, requiring 3 braiding machines. The preferred number of braiding directions is 3, denoted as the first braiding direction, the second braiding direction, and the third braiding direction. The remaining braiding directions are denoted as the fourth braiding direction, the fifth braiding direction, and the sixth braiding direction. Then, step 4 is replaced by: continuing to braid the remaining braiding directions according to step 2 until the predetermined length of the remaining braiding directions is reached, thus completing the braiding of the remaining branch pipes of the multi-way pipe.

[0033] In step 3, after the yarns in the first and second weaving directions are changed, the yarns from the two weaving areas after the yarn change are used to weave the junction. The yarn is cut according to the calculated yarn required for the junction. Then, the part corresponding to the junction is manually interwoven according to the interlacing pattern of the yarns in the pattern. The yarns in the third weaving direction beyond the junction are continued to be woven using the remaining yarns from the two weaving areas until the weaving is completed.

[0034] By adopting the above technical solution, the present invention provides a three-dimensional braiding method for multi-channel tubes. In the steps, the multi-channel tubes are braided by reducing yarn thickness. The operation is simple and can realize the integrated braiding of multi-channel tubes, achieving one-time forming and overall braiding of net size, avoiding the secondary connection process, improving the stability and impact resistance of the braided structure, and can braid irregularly shaped woven materials of any thickness and shape as needed, with a wide range of applications. Attached Figure Description

[0035] Figure 1This is a schematic diagram of the weaving mold in Example 1;

[0036] Figure 2 This is a schematic diagram of the fabric yarns and weaving in the first and second weaving directions in Example 1;

[0037] Figure 3 This is a schematic diagram of the movement of the tracer yarn in Examples 1-3;

[0038] Figure 4 The diagram shows the motion trajectory of the tracer yarn in Examples 1-3;

[0039] Figure 5 This is a schematic diagram of the braiding at the junction of the three-way pipes in Example 1;

[0040] Figure 6 This is a schematic diagram of the fabric yarn and weaving in the third weaving direction in Example 1;

[0041] Figure 7 This is a schematic diagram of the weaving mold in Example 2;

[0042] Figure 8 This is a schematic diagram of the fabric yarns and weaving in the first and second weaving directions in Example 2;

[0043] Figure 9 This is a schematic diagram of the braiding at the junction of the four-way pipes in Example 2;

[0044] Figure 10 This is a schematic diagram of the fabric yarns and weaving in the third and fourth weaving directions in Example 2;

[0045] Figure 11 This is a schematic diagram of the weaving mold in Example 3;

[0046] Figure 12 This is a schematic diagram of the fabric yarns and weaving in the first, second, and third weaving directions in Example 3;

[0047] Figure 13 This is a schematic diagram of the braiding at the junction of the five-way pipes in Example 3;

[0048] Figure 14 This is a schematic diagram of the fabric yarn and weaving in the fourth and fifth weaving directions in Example 3.

[0049] In the picture:

[0050] Weaving mold 1 First straight rod 11

[0051] Second straight bar 12, Third straight bar 13

[0052] 1' weaving mold 1' 11' first straight bar

[0053] Second straight bar 12' Third straight bar 13'

[0054] Fourth straight bar 14' braiding mold 1”

[0055] First straight bar 11” Second straight bar 12”

[0056] Third straight bar 13” Fourth straight bar 14”

[0057] Fifth straight bar 15” woven workwear 2

[0058] Knitting area 10 Knitting area 20 Detailed Implementation

[0059] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0060] Example 1

[0061] A three-dimensional braiding method for a tee pipe includes the following steps:

[0062] Step 1: Determine the preferred braiding direction for the tee pipe:

[0063] 1.1 First, follow the shape of the tee pipe, such as... Figures 1-2 As shown, the braiding mold 1 is assembled. The braiding mold 1 includes a first straight bar 11, a second straight bar 12, and a third straight bar 13 that are detachably connected. The braiding mold 1 is Y-shaped and has a circular cross-section. Then, the first straight bar 11 and the second straight bar 12 of the braiding mold 1 are fixed on the braiding fixture 2. The braiding fixture 2 is then fixed on the braiding beam. The braiding direction of the first straight bar 11 after fixing is taken as the first braiding direction, the braiding direction of the second straight bar 12 after fixing is taken as the second braiding direction, and the braiding direction of the third straight bar 13 after fixing is taken as the third braiding direction. The direction in which the T-shaped pipe is braided first is selected, with the first braiding direction and the second braiding direction being the preferred braiding directions.

[0064] 1.2 such as Figure 2 As shown, the yarns are arranged on the yarn carriers of the corresponding braiding machines according to the first and second braiding directions. The yarns on each braiding machine are divided into braiding area 10 and braiding area 20. The direction in which the braiding machines are close together is the inside, and the direction in which the braiding machines are far apart is the outside. According to the pattern of yarn weaving, the innermost and outermost layers of yarns in each braiding area are set as stationary rows. That is, the yarns on the stationary rows do not participate in the movement during weaving. The row represents the number of layers of the braided three-way tube, denoted by m. The column represents the number of yarn columns required for the length of the three-way tube after it is flattened in the corresponding braiding direction, denoted by n. The values ​​of n and m are both greater than 0. The total number of yarns for each braiding machine is N = n × (m + 1).

[0065] Step 2, Preferred knitting direction:

[0066] 2.1 After the yarn is woven, it is set to the original state. First, the yarn carriers on adjacent columns of each braiding machine move in opposite directions.

[0067] 2.2 Then the yarn carriers on adjacent rows move in opposite directions. At this time, the stationary rows do not participate in the movement. Then the yarn is changed. The inner layer of one weaving area of ​​each weaving machine is exchanged with the inner layer of another weaving area, and the outer layer of one weaving area is exchanged with the outer layer of another weaving area. The yarn of the stationary rows is not changed. After the yarn change is completed, the third step is performed.

[0068] The yarn movement directions in 2.3 and 2.1 are opposite;

[0069] 2.4 The yarn movement direction is opposite to that in 2.2. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0070] The yarn movement directions are opposite in 2.5 and 2.3;

[0071] 2.6 The yarn movement direction is opposite to that in 2.4. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0072] In 2.7 and 2.5, the yarns move in opposite directions;

[0073] The yarn movement direction is opposite to that in 2.8 and 2.6. Then, the yarn is changed. The yarn changing operation is the same as that in 2.2.

[0074] like Figures 3-4 As shown, a single yarn is used as a tracer yarn. The movement pattern of the tracer yarn is the movement pattern of the yarn. After the eight steps of movement of the yarn carrier, the yarn completes a cycle on the chassis of the braiding machine. The above eight braiding steps are repeated and supplemented with the corresponding manual "tightening" process to make the yarns intertwine together until the predetermined length of the preferred braiding direction is reached, thus completing the braiding of the corresponding branch tube of the three-way tube.

[0075] Step 3, Braiding at the junction of the tee pipes:

[0076] 3.1 such as Figure 5 As shown, as the yarns in each preferred weaving direction are woven to the junction of the three-way tube, since the shape of the junction of the three-way tube is different from that of each branch tube, and the size is also different, the method of overall yarn change plus alternating weaving is adopted. The yarns of the inner weaving area 20 of one weaving machine are transferred and exchanged with the yarns of the inner weaving area 20 of another weaving machine.

[0077] 3.2 Then perform step 2 on one of the braiding machines, and then perform step 2 on the other braiding machine to complete the braiding of the remaining braided area at the junction of the tee pipe;

[0078] Step 4: Knitting in the remaining directions:

[0079] Then, after the yarn has finished weaving the junction of the three-way tube, as follows: Figure 6 As shown, each braiding machine reduces half of the yarn by a "one-off" yarn reduction method. Then, the remaining half of the yarn from each braiding machine is moved to the corresponding position in another braiding area 10 by a yarn transfer method. The remaining braiding direction is continued according to step 2 until the predetermined length of the third braiding direction is reached, thus completing the braiding of the remaining branch tubes of the three-way tube.

[0080] Step 5: Remove the braiding mold to obtain a T-shaped pipe with a circular cross-section.

[0081] In step 3, to save yarn, after the yarn in the first weaving direction and the yarn in the second weaving direction are changed, the yarn from the two weaving areas after the yarn change is used to weave the junction. The yarn is cut according to the calculated yarn required for weaving the junction. Then, the part corresponding to the junction is manually interwoven according to the interlacing pattern of the yarn in the pattern. The yarn in the third weaving direction beyond the junction is continued to be woven using the remaining yarn from the two weaving areas. The "skip one minus one" operation is omitted in step 4 until the weaving is completed.

[0082] Example 2

[0083] A three-dimensional braiding method for a four-way conduit includes the following steps:

[0084] Step 1: Determine the preferred braiding direction for the four-way connector:

[0085] 1.1 First, follow the shape of the four-way pipe, such as... Figures 7-8 As shown, the braiding mold 1' is assembled. The braiding mold 1' includes a first straight bar 11', a second straight bar 12', a third straight bar 13', and a fourth straight bar 14' that can be detachably connected. The braiding mold 1' is X-shaped and has a circular cross-section. Then, the first straight bar 11' and the second straight bar 12' of the braiding mold 1' are fixed on the braiding fixture 2. The braiding fixture 2 is then fixed on the braiding crossbeam. The braiding direction of the first straight bar 11' after fixing is taken as the first braiding direction, the braiding direction of the second straight bar 12' after fixing is taken as the second braiding direction, the braiding direction of the third straight bar 13' after fixing is taken as the third braiding direction, and the braiding direction of the fourth straight bar 14' after fixing is taken as the fourth braiding direction. The direction in which the four-way pipe is braided first is selected, with the first and second braiding directions being the preferred braiding directions.

[0086] To facilitate weaving, when assembling the weaving mold, first assemble the first straight bar 11' and the second straight bar 12'. When weaving to the junction of the four-way pipe, then assemble the third straight bar 13' and the fourth straight bar 14' completely.

[0087] 1.2 Arrange the yarns on the yarn carriers of the corresponding braiding machines according to the first and second braiding directions. Divide the yarns on each braiding machine into braiding area 10 and braiding area 20. The direction in which the braiding machines are close together is the inside, and the direction in which the braiding machines are far apart is the outside. According to the pattern of yarn weaving, the innermost and outermost layers of yarns in each braiding area are set as stationary rows. That is, the yarns on the stationary rows do not participate in the movement during weaving. The row represents the number of layers of the four-way tube, denoted by m. The column represents the number of yarn columns required for the length of the four-way tube after it is flattened in the braiding direction, denoted by n. The values ​​of n and m are both greater than 0. The total number of yarns for each braiding machine is N = n × (m + 1).

[0088] Step 2, Preferred knitting direction:

[0089] 2.1 After the yarn is woven, it is set to the original state. First, the yarn carriers on adjacent columns of each braiding machine move in opposite directions.

[0090] 2.2 Then the yarn carriers on adjacent rows move in opposite directions. At this time, the stationary rows do not participate in the movement. Then the yarn is changed. The inner layer of one weaving area of ​​each weaving machine is exchanged with the inner layer of another weaving area, and the outer layer of one weaving area is exchanged with the outer layer of another weaving area. The yarn of the stationary rows is not changed. After the yarn change is completed, the third step is performed.

[0091] The yarn movement directions in 2.3 and 2.1 are opposite;

[0092] 2.4 The yarn movement direction is opposite to that in 2.2. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0093] The yarn movement directions are opposite in 2.5 and 2.3;

[0094] 2.6 The yarn movement direction is opposite to that in 2.4. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0095] In 2.7 and 2.5, the yarns move in opposite directions;

[0096] The yarn movement direction is opposite to that in 2.8 and 2.6. Then, the yarn is changed. The yarn changing operation is the same as that in 2.2.

[0097] like Figures 3-4As shown, after the above eight steps of movement of the yarn carrier, the yarn completes one cycle on the chassis of the braiding machine. The above eight braiding steps are repeated and supplemented by the corresponding manual "tightening" process to make the yarn intertwine together until the predetermined length of the preferred braiding direction is reached, thus completing the braiding of the corresponding branch tube of the four-way tube.

[0098] Step 3, Braiding at the junction of the four-way pipes:

[0099] 3.1 such as Figure 9 As shown, as the yarns in each preferred weaving direction are woven to the junction of the four-way tube, since the shape of the junction of the four-way tube is different from that of each branch tube, and the size is also different, the method of overall yarn change plus alternating weaving is adopted. The yarns in the weaving area on the inner side of one weaving machine are transferred and exchanged with the yarns in the weaving area on the inner side of another weaving machine.

[0100] 3.2 Then perform step 2 on one of the knitting machines, and then perform step 2 on the other knitting machine to complete the knitting of the remaining knitting area;

[0101] Step 4: Knitting in the remaining directions:

[0102] Then, after the yarn has finished weaving the junction of the four-way tube, as follows: Figure 10 As shown, without reducing yarn, the yarns in the inner braiding areas of the two braiding machines are moved back and exchanged. Then, the yarns of the braiding machine that originally corresponded to the first braiding direction continue to braid along the fourth braiding direction, and the yarns of the braiding machine that originally corresponded to the second braiding direction continue to braid along the third braiding direction, until the predetermined length of the remaining braiding direction is reached, thus completing the braiding of the remaining branch tubes of the four-way tube.

[0103] Step 5: Remove the braiding mold to obtain a four-way pipe with a circular cross-section.

[0104] Example 3

[0105] A three-dimensional braiding method for a five-way connector includes the following steps:

[0106] Step 1: Determine the preferred braiding direction for the bottom bracket:

[0107] 1.1 First, follow the shape of the bottom bracket, such as... Figures 11-12As shown, the braiding mold 1” is assembled. The braiding mold 1” includes a first straight bar 11”, a second straight bar 12”, a third straight bar 13”, a fourth straight bar 14”, and a fifth straight bar 15” that can be detachably connected. The braiding mold is ★-shaped and the cross-section of the braiding mold 1” is circular. Then, the first straight bar 11”, the second straight bar 12”, and the third straight bar 13” of the braiding mold 1” are fixed on the braiding fixture 2. The braiding fixture 2 is then fixed on the braiding crossbeam. The braiding direction of the first straight bar 11” after fixing is taken as the first braiding direction, the braiding direction of the second straight bar 12” after fixing is taken as the second braiding direction, the braiding direction of the third straight bar 13” after fixing is taken as the third braiding direction, the braiding direction of the fourth straight bar 14” after fixing is taken as the fourth braiding direction, and the braiding direction of the fifth straight bar 15” after fixing is taken as the fifth braiding direction. The direction in which the five-way pipe is braided first is selected, with the first braiding direction, the second braiding direction, and the third braiding direction being the preferred braiding directions.

[0108] To facilitate weaving, when assembling the weaving mold 1”, first assemble the first straight bar 11”, the second straight bar 12” and the third straight bar 13”. When weaving to the junction of the five-way pipe, then assemble the fourth straight bar 14” and the fifth straight bar 15” completely.

[0109] 1.2 Arrange the yarns on the yarn carriers of the corresponding braiding machines according to the first, second, and third braiding directions. Divide the yarns on each braiding machine into braiding area 10 and braiding area 20. The direction in which the braiding machines are close together is the inside, and the direction in which the braiding machines are far apart is the outside. According to the pattern of yarn weaving, the innermost and outermost layers of yarns in each braiding area are set as stationary rows. That is, the yarns on the stationary rows do not participate in the movement during weaving. The row represents the number of layers of braiding the five-way tube, denoted by m. The column represents the number of yarn columns required for the length of the five-way tube after flattening in the braiding direction, denoted by n. The values ​​of n and m are both greater than 0. The total number of yarns for each braiding machine is N = n × (m + 1).

[0110] Step 2, Preferred knitting direction:

[0111] 2.1 After the yarn is woven, it is set to the original state. First, the yarn carriers on adjacent columns of each braiding machine move in opposite directions.

[0112] 2.2 Then the yarn carriers on adjacent rows move in opposite directions. At this time, the stationary rows do not participate in the movement. Then the yarn is changed. The inner layer of one weaving area of ​​each weaving machine is exchanged with the inner layer of another weaving area, and the outer layer of one weaving area is exchanged with the outer layer of another weaving area. The yarn of the stationary rows is not changed. After the yarn change is completed, the third step is performed.

[0113] The yarn movement directions in 2.3 and 2.1 are opposite;

[0114] 2.4 The yarn movement direction is opposite to that in 2.2. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0115] The yarn movement directions are opposite in 2.5 and 2.3;

[0116] 2.6 The yarn movement direction is opposite to that in 2.4. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.2.

[0117] In 2.7 and 2.5, the yarns move in opposite directions;

[0118] The yarn movement direction is opposite to that in 2.8 and 2.6. Then, the yarn is changed. The yarn changing operation is the same as that in 2.2.

[0119] like Figures 3-4 As shown, after the above eight steps of movement of the yarn carrier, the yarn completes a cycle on the chassis of the braiding machine. The above eight braiding steps are repeated and supplemented by the corresponding manual "tightening" process to make the yarn intertwine together until the predetermined length of the preferred braiding direction is reached, thus completing the braiding of the corresponding branch tube of the five-way tube.

[0120] Step 3, Braiding at the junction of the bottom bracket:

[0121] 3.1 such as Figure 13 As shown, as the yarns in each preferred weaving direction weave to the junction of the five-way tube, since the shape of the junction of the five-way tube is different from that of each branch tube, and the size also varies, an overall yarn change plus alternating weaving method is adopted. The yarns of the inner weaving area of ​​the first weaving machine are moved to the corresponding position of the inner weaving area of ​​the second weaving machine, the yarns of the inner weaving area of ​​the second weaving machine are moved to the corresponding position of the inner weaving area of ​​the third weaving machine, and the yarns of the inner weaving area of ​​the third weaving machine are moved to the corresponding position of the inner weaving area of ​​the first weaving machine.

[0122] 3.2 Then perform step 2 on one of the knitting machines, and then perform step 2 on the other knitting machine to complete the knitting of the remaining knitting area;

[0123] Step 4: Knitting in the remaining directions:

[0124] Then, after the yarn has finished weaving the junction of the five-way tube, as follows: Figure 14As shown, each braiding machine reduces yarn in one braiding direction according to the "one-off" yarn reduction method. At this time, the braiding machine corresponding to the third braiding direction stops braiding. Then, the remaining yarn of the braiding machine corresponding to the third braiding direction is transferred by moving the yarn from one braiding area 10 to the corresponding position of the remaining braiding machine, and the yarn from another braiding area 20 to the corresponding position of the remaining braiding machine. Then, the yarn of the braiding machine originally corresponding to the first braiding direction continues to braid along the fourth braiding direction, and the yarn of the braiding machine originally corresponding to the second braiding direction continues to braid along the fifth braiding direction. The remaining braiding directions are continued according to step 2 until the predetermined length of the remaining braiding direction is reached, thus completing the braiding of the remaining branch tubes of the five-way tube.

[0125] Step 5: Remove the braiding mold to obtain a five-way pipe with a circular cross-section.

[0126] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A three-dimensional braiding method for multi-channel tubes, characterized by comprising the following steps: Step 1: Determine the preferred braiding direction for the multi-port tubing: 1.1 First, assemble the braiding mold according to the shape of the multi-port pipe. Then, fix the braiding mold on the braiding fixture and then fix the braiding fixture on the braiding beam. Select the direction in which the multi-port pipe is first braided, and record it as the preferred braiding direction. The number of preferred braiding directions is ≥2 and does not exceed the number of branch pipes of the multi-port pipe. 1.2 Arrange the yarns on the yarn carriers of the corresponding braiding machines according to the number of preferred braiding directions. Divide the yarns on each braiding machine into two braiding areas, with the direction of each braiding machine being closer to each other as the inner and the direction of each braiding machine being farther away as the outer. According to the pattern of yarn weaving, the innermost and outermost layers of yarns in each braiding area are set as stationary rows, that is, the yarns on the stationary rows do not participate in the movement during braiding. The row represents the number of layers of the multi-pass tube, denoted by m. The column represents the number of yarn columns required for the length of the multi-pass tube after flattening in the braiding direction, denoted by n. The values ​​of n and m are both greater than 0. The total number of yarns for each braiding machine is N = n × (m + 1). Step 2, Preferred knitting direction: 2.1 After the yarn is woven, it is set to the original state. First, the yarn carriers on adjacent columns of each braiding machine move in opposite directions. 2.2 Then the yarn carriers on adjacent rows move in opposite directions. At this time, the stationary rows do not participate in the movement. Then the yarn is changed. The inner layer yarns of the two weaving areas of each weaving machine are swapped with the inner layer yarns, and the outer layer yarns are swapped with the outer layer yarns. The yarns of the stationary rows are not changed. After the yarn change is completed, the third step is performed. The yarn movement directions are opposite to those in 2.3 and 2.1; 2.4 The yarn movement direction is opposite to that in 2.

2. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.

2. The yarn movement directions are opposite in 2.5 and 2.3; 2.6 The yarn movement direction is opposite to that in 2.

4. Then, the yarn is changed. The yarn changing operation is the same as the yarn changing operation in 2.

2. In 2.7 and 2.5, the yarns move in opposite directions; The yarn movement direction is opposite to that in 2.8 and 2.

6. Then, the yarn is changed. The yarn changing operation is the same as that in 2.

2. After the yarn carrier moves through the above eight steps, the yarn completes a cycle on the chassis of the braiding machine. The above eight braiding steps are repeated and supplemented by the corresponding manual "tightening" process to make the yarn intertwine together until the predetermined length of the preferred braiding direction is reached, thus completing the braiding of the corresponding branch tubes of the multi-channel tube. Step 3, Braiding at the junction of multiple pipes: 3.1 As the yarns in each preferred weaving direction are woven to the junction of the multi-pass tube, since the shape of the junction of the multi-pass tube is different from that of each branch tube and the size is also different, the method of overall yarn change plus alternating weaving is adopted. The yarns in the weaving area on the inner side of one weaving machine are transferred and exchanged with the yarns in the weaving area on the inner side of another weaving machine. 3.2 Then perform step 2 on one of the knitting machines, and then perform step 2 on the other knitting machine to complete the knitting of the remaining knitting area; Step 4: Knitting in the remaining directions: Then, after the yarn has finished weaving the junction of the multi-channel tubes, each braiding machine reduces half of the yarn by reducing yarn in a "one-off" manner. Then, the remaining half of the yarn on each braiding machine is moved to the corresponding position of another braiding area on the same braiding machine by a yarn transfer method. The remaining braiding direction is continued according to step 2 until the predetermined length of the remaining braiding direction is reached, thus completing the weaving of the remaining branch tubes of the multi-channel tube. Step 5: Remove the braiding mold to obtain the multi-port pipe.

2. A method of three-dimensional braiding of a multi-lumen tube according to claim 1, wherein: The multi-way pipe is a tee pipe, a four-way pipe, a five-way pipe, or a six-way pipe.

3. The method of claim 1 wherein: The cross-section of the multi-port pipe is circular, square, or rhomboid.

4. The three-dimensional braiding method for a multi-channel tube according to claim 1, characterized in that: The yarn is one or more of carbon fiber, silicon carbide fiber, silicon nitride fiber and aramid fiber.

5. The three-dimensional braiding method for a multi-channel tube according to claim 1, characterized in that: The multi-port pipe is a tee pipe, and two braiding machines are required. The preferred number of braiding directions is two, which are denoted as the first braiding direction and the second braiding direction. The remaining braiding directions are denoted as the third braiding direction.

6. The three-dimensional braiding method for a multi-channel tube according to claim 1, characterized in that: The multi-way pipe is a four-way pipe, requiring two braiding machines. The preferred number of braiding directions is two, denoted as the first braiding direction and the second braiding direction. The remaining braiding directions are denoted as the third braiding direction and the fourth braiding direction. Then, step 4 is replaced by: continuing to braid the remaining braiding directions according to step 2 until the predetermined length of the remaining braiding directions is reached, thus completing the braiding of the remaining branch pipes of the multi-way pipe.

7. The three-dimensional braiding method for a multi-channel tube according to claim 1, characterized in that: The multi-way tube is a five-way tube, requiring 3 braiding machines. The preferred number of braiding directions is 3, denoted as the first braiding direction, the second braiding direction, and the third braiding direction. The remaining braiding directions are denoted as the fourth braiding direction and the fifth braiding direction. Then, step 4 is replaced by a uniform reduction of yarn in an "alternating one-to-one" manner, reducing the yarn in one braiding direction. At this time, the braiding machine corresponding to the third braiding direction stops braiding. Then, the remaining yarn in the braiding machine corresponding to the third braiding direction is moved by a yarn shifting method, moving the yarn of one braiding area to the corresponding position of the remaining braiding machine, and moving the yarn of another braiding area to the corresponding position of the remaining braiding machine. The remaining braiding directions are continued according to step 2 until the predetermined length of the remaining braiding directions is reached, thus completing the braiding of the remaining branch tubes of the multi-way tube.

8. The three-dimensional braiding method for a multi-channel tube according to claim 1, characterized in that: The multi-way pipe is a six-way pipe, requiring 3 braiding machines. The preferred number of braiding directions is 3, denoted as the first braiding direction, the second braiding direction, and the third braiding direction. The remaining braiding directions are denoted as the fourth braiding direction, the fifth braiding direction, and the sixth braiding direction. Then, step 4 is replaced by: continuing to braid the remaining braiding directions according to step 2 until the predetermined length of the remaining braiding directions is reached, thus completing the braiding of the remaining branch pipes of the multi-way pipe.

9. The three-dimensional braiding method for a multi-channel tube according to claim 1, characterized in that: In step 3, after the yarns in the first and second weaving directions are changed, the yarns from the two weaving areas after the yarn change are used to weave the junction. The yarn is cut according to the calculated yarn required for the junction. Then, the part corresponding to the junction is manually interwoven according to the interlacing pattern of the yarns in the pattern. The yarns in the third weaving direction beyond the junction are continued to be woven using the remaining yarns from the two weaving areas until the weaving is completed.

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