CN106400295B - Three-dimensional woven tube and the three dimensional knitting machine and weaving for making the three-dimensional woven tube - Google Patents

Abstract

The invention relates to a three-dimensional braided pipe and a three-dimensional braided machine and a braiding process for making the three-dimensional braided pipe. The three-dimensional braided pipe includes a plurality of representative volume units, and each representative volume unit is moved circumferentially by two corresponding circumferential yarn carriers. The circumferential yarn node formed and two radial yarn nodes formed by the radial movement of the corresponding radial yarn carrier are formed. Any yarn node in the same representative volume unit is interspersed between two adjacent yarn nodes. Between the yarn nodes, each representative volume unit is arranged into a circular tube structure in which each yarn node is connected in corresponding order in the circumferential direction and in corresponding order in the axial direction. The invention provides a three-dimensional braided tube based on space group P4, a three-dimensional braided machine and a braiding process for making the three-dimensional braided tube.

Description

Three-dimensional braided tube and three-dimensional braided machine and braiding process for making the three-dimensional braided tube

technical field

The invention relates to a three-dimensional braided tube based on space group P4 in the field of three-dimensional braided tubes, a three-dimensional braided machine and a braiding process for making the three-dimensional braided tube.

Background technique

In recent years, three-dimensional braided composite materials have been widely used as a new type of engineering material. Because of their advantages of complete structure, one-time molding, and time-saving and labor-saving, this braided fabric is widely used in various fields and has been approved by the Institute of Weaving Technology. Considerable attention.

In order to obtain braided materials with more stable geometric structure and better mechanical properties, people have been making new attempts on braided structures from space group P3 to space group P4. Chinese patent CN105063885A discloses a "three-dimensional braided material based on space group P4 symmetry", which discloses a four-yarn textile structure based on space group P4. The four-yarn textile structure includes multiple The representative volume unit connected in sequence above, as shown in Figure 1 of the public document: it includes four yarn nodes, any yarn node interspersed between two adjacent yarn nodes, Each representative volume unit is sequentially connected in the horizontal and vertical directions to form a three-dimensional woven fabric with a planar structure. The problem with the existing three-dimensional braided fabric is that the three-dimensional braided fabric has a planar structure, but in actual production and application, the tubular three-dimensional braided fabric has more application value.

Contents of the invention

The object of the present invention is to provide a three-dimensional braided pipe based on space group P4; the object of the present invention is also to provide a three-dimensional braided machine and a braiding process for making the three-dimensional braided pipe.

In order to solve the above problems, the technical scheme of the three-dimensional braided pipe in the present invention is:

The three-dimensional braided tube based on space group P4 includes multiple representative volume units, each representative volume unit consists of two circumferential yarn nodes formed by the circumferential movement of the corresponding circumferential yarn carrier and two circumferential yarn nodes formed by the corresponding radial The radial yarn section formed by the radial movement of the yarn carrier, any yarn section in the same representative volume unit is interspersed between two adjacent yarn sections, and each representative volume unit is arranged into each The yarn nodes correspond to the sequentially connected circular tube structures in the circumferential direction and sequentially connected in the axial direction.

On an axial section perpendicular to the circular tube structure, the three-dimensional braided tube includes at least two braided layers formed by a single layer of the representative volume unit.

The technical scheme of three-dimensional knitting machine among the present invention is:

The three-dimensional knitting machine includes 2n circumferential moving tracks provided on coaxial lines. The guiding movement on the circumferential moving track is equipped with a plurality of circumferential yarn carriers evenly spaced along the circumferential direction. Correspondence on different circumferential moving tracks The circumferential yarn carriers are radially distributed in the center of the circumferential moving track, and the circumferential yarn carriers on the same radial line are defined to form a row. The three-dimensional knitting machine also includes multiple rows corresponding to the number of rows of the circumferential yarn carriers. The radial yarn carriers radially distributed to the center of the moving track can move radially along the circumferential moving track, each column of radial yarn carriers is respectively located between two adjacent columns of circumferential yarn carriers, The number of radial yarn carriers in the yarn carrier is 2n, and the corresponding two radial yarn carriers in the two adjacent rows of radial yarn carriers in any row of radial yarn carriers are on the circumferential moving track On the same radius where the center is the center of the circle, each radial yarn carrier and its adjacent circumferential yarn carrier are arranged in a dislocation in the circumferential direction. The outermost radial yarn carrier of one row of radial yarn carriers is located outside the outermost circumferential yarn carrier of the row of circumferential yarn carriers and can move in the circumferential direction, and the innermost of the other row of radial yarn carriers The radial yarn carrier is located inside the innermost circumferential yarn carrier of the row of circumferential yarn carriers and can move along the circumferential direction, and n takes a positive integer.

The technical scheme of weaving process among the present invention is:

The weaving process includes a plurality of repeated weaving step units, and each weaving step unit includes the following steps. In the first step, the circumferential yarn carriers on two adjacent circumferential moving tracks respectively face in opposite directions along the corresponding circumferential moving tracks Move a circumferential angle, and the circumferential angle is equal to the angle between two adjacent rows of circumferential yarn carriers; in the second step, the adjacent two rows of radial yarn carriers move one Radial distance, the radial distance is equal to the distance between two adjacent radial yarn carriers in the same row of radial yarn carriers; the third step, among the two adjacent rows of radial yarn carriers, the distance from the center of the circumferential moving track is closest The radial yarn carrier and the radial yarn carrier farthest from the center of the circumferential moving track move in the opposite direction along the circumferential direction by one of the circumferential angles.

The beneficial effects of the present invention are: in the present invention, the circumferential movement of the circumferential yarn carrier along the circumferential moving track forms a circumferential yarn node, and the radial yarn carrier moves radially to form a radial yarn segment, each representing The volume units are all composed of two circumferential yarn nodes and two radial yarn nodes, thus forming a three-dimensional braided tube based on space group P4, which has a wider space than the planar P4 braid. Value.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of a three-dimensional braided pipe in the present invention;

Fig. 2 is the theoretical model figure of Fig. 1;

Fig. 3 is an enlarged view of place A in Fig. 1;

Fig. 4 is a schematic structural view of a single representative volume unit in an intermediate position in Fig. 1;

Fig. 5 is a perspective view of Fig. 4;

Fig. 6 is a schematic structural view of a single representative volume unit at an inner edge position in Fig. 1;

Fig. 7 is a schematic structural view of a single representative volume unit at an outer edge position in Fig. 1;

Fig. 8 is a topological structure diagram of a representative volume unit in the present invention;

Fig. 9 is a schematic diagram of movement of each circumferential yarn carrier and radial yarn carrier in the three-dimensional knitting process of the present invention.

Detailed ways

The embodiment of the three-dimensional braided tube based on space group P4 is shown in FIGS. The circumferential yarn segment 12 formed corresponding to the circumferential movement of the circumferential yarn carrier and two radial yarn segments 13 formed by the radial movement of the corresponding radial yarn carrier are formed. In the same representative volume unit 11 Any one yarn node is interspersed between two adjacent yarn nodes. Each representative volume unit is arranged into a circular tube structure in which each yarn node is connected in corresponding order in the circumferential direction and in corresponding order in the axial direction.

Due to multiple braided layers, the representative volume units at the inner edge position, the representative volume units at the outer edge position, and the middle positions (i.e., the second, third and fourth layers counted from the inner to the outer The radial yarn nodes of the representative volume unit of ) will be different, the structure of the representative volume unit at the middle position is shown in Figure 4-5, and the structure of the representative volume unit at the inner edge position is shown in Figure 6 The structure of the representative volume unit at the outer edge position is shown in Figure 7. It can be seen from the figure that the inner end of the radial yarn node of the representative volume unit at the inner edge position has an inner corner in the circumferential direction Structure, the outer end of the radial yarn node of the representative volume unit at the outer edge position has an outer corner in the circumferential direction, while the radial yarn node of the representative volume unit at the middle position has no above-mentioned corner structure, in the top view The trajectory of radial yarn nodes in the direction is a square ring. The shapes of the circumferential yarn nodes of the representative volume units at different positions are the same, but differ in radius, the radius of the circumferential yarn nodes of the representative volume units of the outer layer will be larger than that of the representative volume units of the inner layer The radius of the circumferential yarn node of the volume element. In the figure, △θ is the central angle of each representative unit; γ' indicates the angle between the circumferential yarn segment 12 and the radial yarn segment 13, which is greater than 90 degrees; △R indicates the radius increase of the representative unit The amount; α', β' represent the braiding angle; h' represents the height of the representative unit.

The embodiment of the three-dimensional knitting machine is shown in Figure 9: it includes the circumferential moving track 22 provided with 2n coaxial lines. In this embodiment, n is 2, and the value of n means the number of braided layers. The three-dimensional knitting machine can weave a two-layer three-dimensional braided tube, and the guide movement on the circumferential moving track 22 is equipped with a plurality of circumferential yarn carriers 20 (represented by solid points in Fig. 9 ) that are evenly spaced along the circumferential direction. The corresponding circumferential yarn carriers on the circumferential moving track are radially distributed in the center of the circumferential moving track, and the circumferential yarn carriers on the same radial line are defined to form a row. The three-dimensional knitting machine also includes a row of circumferential yarn carriers. The radial yarn carriers 21 (represented by hollow circles in Fig. 9 ) that are radially distributed in the center of the circumferential moving track and radially move along the circumferential moving track for multiple rows corresponding to the numbers, each row of radial yarn carrying devices are respectively located at Corresponding between two adjacent rows of circumferential yarn carriers, the number of radial yarn carriers in each row of radial yarn carriers is 2n, that is, 4, and the adjacent two rows of radial yarn carriers in any row of radial yarn carriers The corresponding two radial yarn carriers in the yarn device are located on the same radius with the center of the circumferential moving track as the center of the circle, and each radial yarn carrier and its adjacent circumferential yarn carrier are staggered in the circumferential direction. Among the adjacent two rows of radial yarn carriers of a row of circumferential yarn carriers, the outermost radial yarn carrier of one row of radial yarn carriers is located at the outermost circumferential yarn carrier of the row of circumferential yarn carriers The outermost radial yarn carrier of another row of radial yarn carriers is located inside the innermost circumferential yarn carrier of the row of circumferential yarn carriers and can move along the circumferential direction. The circumferential yarn carriers on the same radius are evenly spaced along the circumferential direction, and the radial yarn carriers on the same radius are evenly spaced along the circumferential direction, that is, the angle between two adjacent rows of circumferential yarn carriers and the adjacent The included angles of the two rows of radial yarn carriers are the same.

In other embodiments of the present invention, n may also take other positive integers such as 1, 3, and 4 according to the number of layers to be woven.

The embodiment of the braiding process of using the above-mentioned three-dimensional braiding machine to make a three-dimensional braided tube is shown in Figure 9: it includes a plurality of repeated braiding step units, and the braiding step unit includes the following steps, the first step is shown in A in Figure 9, adjacent The circumferential yarn carriers on the two circumferential moving tracks respectively move a circumferential angle in the opposite direction along the corresponding circumferential moving tracks, and the circumferential angle is equal to the angle between two adjacent rows of circumferential yarn carriers; the second step is as follows: As shown in B in Figure 9, two adjacent rows of radial yarn carriers move a radial distance in the opposite direction along the radial direction of the circumferential moving track, and the radial distance is equal to that of two adjacent rows of radial yarn carriers in the same row. The distance between two radial yarn carriers; the third step is as shown in C in Fig. 9, among two adjacent rows of radial yarn carriers, the nearest radial yarn carrier from the center of the circumferential moving track is the distance from the circumferential moving The farthest radial yarn carrier in the center of the track moves in the opposite direction along the circumferential direction by one of the circumferential angles. After three steps, each yarn carrier returns to the original arrangement, and then tightens. Repeat the above steps several times to obtain a The prefabricated part of the new three-dimensional braided tube satisfying the symmetry of space group P4, from the top view direction, the movement track of the circumferential yarn carrier is a circular ring, and the movement track of the radial yarn carrier is a square ring.

The yarn trajectory in the preform of the 3D braided tube is shown in Fig. 8: '1-6' indicates the topology of each yarn. '1-4' is the topology of radial yarn nodes. 1 and 2 represent the topology of the outer and inner surface yarns, respectively. 3 and 4 represent the movement law of the radial yarn nodes in the preform. 5 and 6 are the topological structures of the circumferential yarn nodes, repeating Step1, Step2, Step3 and tightening can form a new three-dimensional braided tube. The theoretical model of the novel 3D braided tube can be obtained through the translational symmetry operation of space group P4.

Claims (4)

1. The three-dimensional knitting machine is characterized in that: it includes 2n circumferential moving tracks arranged on coaxial lines, and the guiding movement on the circumferential moving track is equipped with a plurality of circumferential yarn carriers evenly spaced along the circumferential direction. The corresponding circumferential yarn carriers on the moving track are radially distributed in the center of the circumferential moving track, and it is defined that the circumferential yarn carriers on the same radial line form a row, and the three-dimensional knitting machine also includes Multiple rows of radial yarn carriers that radially distribute along the center of the circumferential moving track can move radially along the circumferential moving track, and each row of radial yarn carriers is located between the corresponding two adjacent rows of circumferential yarn carriers The number of radial yarn carriers in each row of radial yarn carriers is 2n, and the corresponding two radial yarn carriers in two adjacent rows of radial yarn carriers in any row of radial yarn carriers are in the On the same radius with the center of the circumferential moving track as the center of the circle, each radial yarn carrier and its adjacent circumferential yarn carrier are staggered in the circumferential direction, and any two adjacent rows of circumferential yarn carriers radially Among the yarn carriers, the outermost radial yarn carrier of one row of radial yarn carriers is located outside the outermost circumferential yarn carrier of the row of circumferential yarn carriers and can move along the circumferential direction, and the other row of radial carriers The innermost radial yarn carrier of the yarn device is located inside the innermost circumferential yarn carrier of the row of circumferential yarn carriers and can move along the circumferential direction, and n is a positive integer. 2. use the three-dimensional braiding machine as claimed in claim 1 to make the braiding process of three-dimensional braided tube, it is characterized in that: comprise a plurality of repeated braiding step units, each braiding step unit comprises the following steps, the first step, adjacent two The circumferential yarn carriers on the two circumferential moving tracks respectively move a circumferential angle in the opposite direction along the corresponding circumferential moving tracks, and the circumferential angle is equal to the angle between two adjacent rows of circumferential yarn carriers; in the second step, Two adjacent rows of radial yarn carriers respectively move a radial distance in the opposite direction along the radial direction of the circumferential moving track, and the radial distance is equal to the distance between two adjacent radial yarn carriers in the same row of radial yarn carriers; In the third step, among two adjacent rows of radial yarn carriers, the radial yarn carrier closest to the center of the circumferential moving track and the radial yarn carrier farthest from the center of the circumferential moving track move in the opposite direction along the circumferential direction one of said circumferential angles. 3. use the three-dimensional braided tube based on space group P4 that braiding process as claimed in claim 2 is made, it adopts three-dimensional braiding machine as claimed in claim 1 to make, it is characterized in that: comprise a plurality of representative volume units, each Each representative volume unit is formed by two circumferential yarn nodes formed by the circumferential movement of the corresponding circumferential yarn carrier in the 3D knitting machine and two radial segments formed by the radial movement of the corresponding radial yarn carrier in the 3D knitting machine Any one yarn node in the same representative volume unit is interspersed between two adjacent yarn nodes, and each representative volume unit is arranged so that each yarn node corresponds to Sequentially connected, corresponding to the sequentially connected circular tube structure in the axial direction. 4. The three-dimensional braided pipe based on space group P4 according to claim 3, characterized in that: on the axial section perpendicular to the circular pipe structure, the three-dimensional braided pipe comprises at least two representative volume units composed of a single layer formed braided layer.