Continuous weaving truss joint invariant spindle array weaving method
By dividing the truss into non-porous and hole-woven parts and turning the spindle trajectory in the hole-woven parts, continuous braiding of tubular truss joints is achieved, and the problems of braiding discontinuity and high cost in the prior art are solved.
Patent Information
- Application Number
- CN202411847989.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-04-08
AI Technical Summary
In the prior art, continuous braiding is difficult to achieve when manufacturing tubular truss joints, and secondary processing or additional processes are often required, resulting in high labor and time costs.
A continuous braided truss joint invariant spindle array weaving method is proposed. By dividing the truss into a non-porous braided part and a holed braided part, and the spindle trajectory running direction is changed at the holed braided part, and the circular hole section is avoided for braiding.
The spindle's operating trajectory without interference after the original track and the change of track is achieved, which meets the requirements of predetermined processing technology and reduces labor and time costs.
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Figure CN119777067A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of round tube weaving, and in particular to a method for weaving a continuous weaving truss joint-invariant spindle array. Background Art
[0002] Compared with tubular trusses made of metal materials, high-performance fiber composite tubular trusses have excellent properties such as high specific strength, specific stiffness, impact resistance and corrosion resistance. They are widely used in satellite trusses, automobile drive shafts, thermal protection components in aerospace, and pipeline transportation and other engineering occasions. The molding methods of high-performance fiber composite tubular truss preforms currently mainly include: weaving molding, fiber winding molding and laying methods. Among them, weaving molding is widely used in components with rotational geometry and multi-directional mechanical properties. Weaving technology has unique advantages. Because of its simple mechanism and convenient processing, it is widely used in the preparation of various fiber-reinforced tubular composite materials.
[0003] The existing weaving manufacturing technology usually makes an integral tube first when manufacturing tubular truss joints, and then uses the hole-opening technology to perform secondary processing on it, but this method will affect the mechanical properties of the truss joints. If the truss joints are to be woven continuously, they are limited by the existing spindle arrangement method and can only move continuously in one way. Therefore, when the truss joints are woven, when the spindles change their movement trajectory, the weaving machine will have collisions between spindles, resulting in shutdown. The current truss joint manufacturing technology lacks a spindle array that can be woven continuously. The current manufacturing is mostly carried out through secondary processing or the addition of certain manufacturing processes, which results in high labor and time costs.
[0004] Therefore, it is necessary to provide a continuous braided truss joint invariant spindle array braiding method to solve the problems in the prior art. Summary of the invention
[0005] In view of this, the present invention proposes a continuous braided truss joint invariant spindle array weaving method, aiming to solve the problems in the prior art.
[0006] The present invention proposes a continuous braided truss joint-invariant spindle array braiding method, comprising:
[0007] The truss is divided into a non-porous woven part and a perforated woven part;
[0008] The non-porous braided portion is braided in one piece, and the spindle continues to move along a circular trajectory;
[0009] When weaving at a holey weaving area, the spindle follows the arc of the track unit, changes the track running direction, and weaves avoiding the circular hole section.
[0010] Furthermore, when weaving at the hole-weaving area, the spindle follows the arc of the track unit, turns the track running direction, and avoids the circular hole section for weaving, including:
[0011] Calculate the parametric equation of the spindle motion trajectory and obtain the trajectory state relationship of different spindles in the same time dimension;
[0012] Obtaining the collision relationship of the spindle during the movement according to the trajectory state relationship;
[0013] Obtaining a minimum spindle period through a collision relationship, and calculating the number of spindle trajectory units according to the minimum spindle period;
[0014] The number of groove wheel notches that the spindles need to be spaced apart is calculated based on the number of spindle trajectory units.
[0015] Furthermore, the calculation of the spindle motion trajectory parameter equation to obtain the trajectory state relationship of different spindles in the same time dimension includes:
[0016] Calculate the parametric equation of the spindle motion trajectory, introduce the time parameter, and obtain the trajectory state relationship under the same time dimension:
[0017]
[0018] In the above formula, n represents the position number of the spindle, n∈[0,1,2,3,······,k], R represents the impeller radius, ω represents the impeller rotation angular velocity, t represents time, x0 represents the movement position of the spindle on the x-axis that changes with time during the movement, and y0 represents the movement position of the spindle on the y-axis that changes with time during the movement.
[0019] Furthermore, when the collision relationship of the spindle during the movement is obtained according to the trajectory state relationship, it includes:
[0020] According to the different directions of movement, the slots storing the two running directions are marked separately;
[0021] The collision relationship of the spindle during the movement is obtained according to the trajectory state relationship.
[0022] Furthermore, the minimum spindle period is obtained through the collision relationship, and the number of spindle trajectory units is calculated according to the minimum spindle period, including:
[0023] The number of spindle track units is calculated by the following formula:
[0024] q = 3j;
[0025] In the above formula, q represents the number of spindle track units, that is, the number of slot sheaves, and j represents any positive integer.
[0026] Further, the number of groove wheel notches that need to be spaced between spindles is calculated according to the number of spindle trajectory units; the number of groove wheel notches that need to be spaced between spindles is calculated according to the number of spindle trajectory units, including:
[0027] The number of spindle track units and the number of groove wheel slots that the spindles need to be spaced apart are calculated using the following formula:
[0028]
[0029] In the above formula, q represents the number of spindle track units, that is, the number of slotted sheaves, j represents any positive integer, and p max Indicates the maximum number of spindles that can be accommodated in the track.
[0030] Compared with the prior art, the beneficial effect of the present invention lies in that the number of spindle trajectory units and the number of spindles of the present invention are in a qualitative relationship, which meets the requirements of the predetermined processing technology and realizes the requirement that the running trajectories of the spindles in the spindle group on the original track and the running trajectories after the track is changed do not interfere with each other. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0032] Figure 1 A diagram of a truss joint structure provided by an embodiment of the present invention;
[0033] FIG2( a ) is a schematic diagram of a three-way truss weaving process provided by an embodiment of the present invention;
[0034] FIG2( b ) is a schematic diagram of a four-way truss weaving process provided by an embodiment of the present invention;
[0035] FIG3( a ) is a schematic diagram of joint tracks at non-joint intersections and joint intersections of a three-way truss provided by an embodiment of the present invention;
[0036] FIG3( b ) is a schematic diagram of joint tracks at non-joint intersections and joint intersections of a four-way truss provided by an embodiment of the present invention;
[0037] Figure 4 A flow chart of a continuous braided truss joint invariant spindle array braiding method provided by an embodiment of the present invention;
[0038] Figure 5 A simplified schematic diagram of a spindle track and a schematic diagram of a weaving position provided in an embodiment of the present invention;
[0039] Figure 6A schematic diagram of the spatial state of a spindle trajectory provided by an embodiment of the present invention;
[0040] Figure 7 The motion trajectory of a single spindle provided by an embodiment of the present invention;
[0041] Figure 8 The motion trajectories of the multiple spindles provided in the embodiment of the present invention;
[0042] Fig. 9 A schematic diagram of the initial position arrangement of spindles provided in an embodiment of the present invention;
[0043] Fig.10 A schematic diagram is provided for the reasonable arrangement of spindles for integrally weaving truss joints provided in an embodiment of the present invention. DETAILED DESCRIPTION
[0044] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0045] A truss is a structure consisting of bars that are usually hinged or rigidly connected at both ends to form a stable triangular unit grid. Truss joints are the connection points in the truss where two or more bars meet. Different structural models are as follows: Figure 1 shown.
[0046] The joint structure of the truss joint varies according to the position of use. According to the type of truss structure, it can be divided into two parts, one is the whole circular tube and the other is the joint connection. Therefore, its weaving state can be roughly divided into two types: at the whole circular tube, the circular track is woven in a whole circle; at the joint, the circular weaving track is intermittently divided to bypass other rods at the joint. Taking the three-way truss joint and the four-way truss joint as examples, the weaving schematic diagrams of different positions are shown in Figure 2. Figure 2 (a) is a schematic diagram of the weaving process of the three-way truss, and Figure 2 (b) is a schematic diagram of the weaving process of the four-way truss.
[0047] During the truss weaving process, weaving is carried out in the weaving direction, the connection parts of the rods at the joints are reserved, and the truss is woven continuously. After weaving in one direction is completed, the core shaft placement method is changed, and weaving is carried out in the same weaving method to complete the truss joint structure.
[0048] Based on this process, the following article explores the reasonable arrangement rules of its spindle trajectory units and the number of spindles.
[0049] The tubular braided track is of "∞" type, with spindles evenly arranged along a fixed circumference and connected end to end to form a closed-loop overall track.
[0050] Truss joint weaving, when analyzing the relative motion relationship between the spindles in the motion state during the weaving process, can be equivalently simplified into two parts. One part is the band weaving with the two ends of the track interconnected (the head end and the end end are in a spatial superposition state. That is, the spindle moves in the reverse direction along the x-axis to the head end position, that is, it continues to move in the positive direction of the x-axis from the head end; conversely, the spindle moves in the positive direction along the x-axis to the end position, that is, it continues to move in the negative direction of the x-axis from the end.); the other part is the band weaving of a limited length track. According to the different structural forms of the truss joints, the cutting and conversion of the spindle track is also different, and its schematic diagram is shown in Figure 3 (taking the three-way truss and the four-way truss as examples). Figure 3 (a) is a schematic diagram of the joint track at the non-joint intersection and joint intersection of the three-way truss, and Figure 3 (b) is a schematic diagram of the joint track at the non-joint intersection and joint intersection of the four-way truss.
[0051] In some embodiments of the present application, see Figure 4 As shown, this embodiment provides a continuous braided truss joint invariant spindle array braiding method, comprising the following steps:
[0052] S100, dividing the truss into a non-porous woven part and a perforated woven part;
[0053] S200, performing integrated weaving on the non-porous weaving portion, and the spindle continues to move along a circular trajectory;
[0054] S300, when weaving at a hole-weaving area, the spindle follows the arc of the track unit, changes the track running direction, and weaves avoiding the circular hole section.
[0055] Specifically, the simplified schematic diagram of the spindle track and the schematic diagram of the weaving position are as follows: Figure 5 shown.
[0056] In some embodiments of the present application, when weaving at a holey weaving location, the spindle follows the arc of the track unit, turns the track running direction, and avoids the circular hole section for weaving, including:
[0057] Calculate the parametric equation of the spindle motion trajectory and obtain the trajectory state relationship of different spindles in the same time dimension;
[0058] Obtaining the collision relationship of the spindle during the movement according to the trajectory state relationship;
[0059] Obtaining a minimum spindle period through a collision relationship, and calculating the number of spindle trajectory units according to the minimum spindle period;
[0060] The number of groove wheel notches that the spindles need to be spaced apart is calculated based on the number of spindle trajectory units.
[0061] Preferably, a four-slot impeller is commonly used in weaving at present, so the four-slot impeller is taken as the analysis subject to analyze the motion state of its spindle.
[0062] See also Figure 6 As shown, Figure 6 is a schematic diagram of the spatial state of the spindle trajectory. In some embodiments of the present application, the calculation of the spindle motion trajectory parameter equation to obtain the trajectory state relationship of different spindles in the same time dimension includes:
[0063] Calculate the parametric equation of the spindle motion trajectory, introduce the time parameter, and obtain the trajectory state relationship under the same time dimension:
[0064]
[0065] In the above formula, n represents the position number of the spindle, n∈[0,1,2,3,······,k], R represents the impeller radius, ω represents the impeller rotation angular velocity, t represents time, x0 represents the movement position of the spindle on the x-axis that changes with time during the movement, and y0 represents the movement position of the spindle on the y-axis that changes with time during the movement.
[0066] Thus, the collision relationship of the spindle during the movement can be obtained. Here, according to the above settings, the slots storing the two running directions are marked respectively according to the different movement directions, and the marking method of the first group is: I n (n is the spindle code), the second group is marked as: II n (n is the spindle code). The specific arrangement position diagram is as follows Fig. 9 shown. Fig. 9 Schematic diagram of the initial position arrangement of the spindles.
[0067] Specifically, see Figure 7 , Figure 7 is the motion trajectory of a single spindle. After being expressed in a plane form, in order to analyze the motion trajectory of the spindle, the spindle is placed in the xy coordinate system, and x0 and y0 are the motion positions of the spindle that change with time during the motion process.
[0068] See also Figure 8 , Figure 8is the motion trajectory of multiple spindles. n represents the position number of the spindle. n is the spindle number. During the movement of the knitting machine, the spindle group is composed of multiple spindles. The positions of the spindles in the initial state of the movement are parameterized to obtain the motion trajectories of the spindles in different initial positions.
[0069] In some embodiments of the present application, obtaining the collision relationship of the spindle during the movement according to the trajectory state relationship includes:
[0070] According to the different directions of movement, the slots storing the two running directions are marked separately;
[0071] The collision relationship of the spindle during the movement is obtained according to the trajectory state relationship.
[0072] Specifically, according to the schematic diagram of the initial position arrangement of the spindles and the spatial motion trajectory of the spindles, it can be known that during the movement of the spindles, the collision relationship between the spindles is shown in Table 1. Table 1 shows the collision relationship between the spindles.
[0073] Table 1
[0074]
[0075]
[0076] When the spindle moves to the end in the positive direction along the x-axis, or moves to the starting end in the reverse direction along the x-axis, the spindle changes its running direction along the track. At this time, according to the trajectory equation described above, the collision relationship with the preset spindles in the same group can be known, as shown in Table 2. Table 2 shows the motion interference between spindles in the same group after changing the motion trajectory.
[0077] Table 2
[0078]
[0079] Depend on Figure 6 The schematic diagram of the spindle trajectory space state and the collision relationship of the spindle are shown in Table 1 and Table 2:
[0080] Case 1: When weaving in a place without circular holes, a spindle has N / 2 slot positions that collide with itself. Combined with the movement of two groups of spindles and the interference and collision between them, the track can accommodate N spindles at most. At this time, the number of spindles that the track can accommodate is m: m∈[1,N).
[0081] Case 2: When knitting at the circular hole, the spindles not only collide with the spindles in the track slot of another group, but also collide with the spindles in this group after changing the running direction at the track end. Any spindle has a collision relationship with N / 2 spindles in another group of spindles, and has a collision relationship with (N / 2-1) spindles in this group. It can be seen that the conditions that the spindle arrangement needs to meet are:
[0082] (1) A trajectory unit contains two slot positions in one direction, so the period must be at least 2;
[0083] (2) Considering the collision between spindles in the same group after the trajectory conversion, the spindle period cannot be 4;
[0084] (3) Considering that the spindle needs to cross-split the trajectory during movement, the circular tube weaving is split into a ribbon-like weaving. Considering the splitting situation, the spindle arrangement period should be 2c (c is a positive integer).
[0085] Combining the above situations 1 and 2, the spindle arrangement must meet both situations 1 and 2 to achieve the integrated weaving of the perforated circular tube. Therefore, based on the above situations, it can be known that the minimum spindle period that meets all situations is 6.
[0086] Then the number of spindle track units (number of four-slot sheaves) q and the maximum number of spindles that can be accommodated in the track are:
[0087]
[0088] Where: q is the number of track units, that is, the number of four-slot sheaves; p max is the maximum number of spindles that can be accommodated in the track; j is an arbitrary positive integer. From this, the collision relationship between the spindles during movement can be obtained, and according to Figure 5 The two ways of spindle movement along the track shown in FIG. 2 show that the spindle needs to meet both conditions at the same time to achieve continuous weaving of the truss joint. Therefore, combined with the above conditions, it can be known that the minimum spindle period that meets all conditions is 6.
[0089] Specifically, the minimum spindle period is obtained through the collision relationship, and the number of spindle trajectory units is calculated according to the minimum spindle period; when the number of groove wheel notches that the spindles need to be spaced according to the number of spindle trajectory units is calculated, it includes:
[0090] The number of spindle track units and the number of groove wheel slots that the spindles need to be spaced apart are calculated using the following formula:
[0091]
[0092] In the above formula, q represents the number of spindle track units, that is, the number of slotted sheaves, j represents any positive integer, and p maxIndicates the maximum number of spindles that can be accommodated in the track.
[0093] Thus, a reasonable arrangement of spindles for integrally braided truss joints can be obtained, such as Fig.10 shown.
[0094] In summary, the existing tubular maypole weaving process can only realize the weaving of mandrels with fixed cross-section changes. When weaving the joints of tubular trusses, the circular weaving track needs to be discontinuously divided to achieve the joint connection on the tube wall. However, if the spindle running track is changed at this time, the spindles will collide with each other, resulting in shutdown. According to the design method proposed in the above research, the number of track units and the number of spindles need to be in a qualitative relationship to meet the requirements of the predetermined processing technology and realize the requirement that the running tracks of the spindles in the spindle group on the original track and the running tracks after the track change do not interfere with each other.
[0095] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
[0096] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0097] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.
[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.
[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A method for weaving a continuous truss joint-invariant spindle array, characterized in that: include: The truss is divided into a non-porous woven part and a perforated woven part; The non-porous braided portion is braided in one piece, and the spindle continues to move along a circular trajectory; When weaving at a holey weaving area, the spindle follows the arc of the track unit, changes the track running direction, and weaves avoiding the circular hole section.
2. The continuous braided truss joint-invariant spindle array braiding method according to claim 1, characterized in that: When weaving at the hole-weaving area, the spindle follows the arc of the track unit, changes the track running direction, and avoids the circular hole section to weave, including: Calculate the parametric equation of the spindle motion trajectory and obtain the trajectory state relationship of different spindles in the same time dimension; Obtaining the collision relationship of the spindle during the movement according to the trajectory state relationship; Obtaining a minimum spindle period through a collision relationship, and calculating the number of spindle trajectory units according to the minimum spindle period; The number of groove wheel notches that the spindles need to be spaced apart is calculated based on the number of spindle trajectory units.
3. The continuous braided truss joint-invariant spindle array braiding method according to claim 2, characterized in that: The calculation of the spindle motion trajectory parameter equation to obtain the trajectory state relationship of different spindles in the same time dimension includes: Calculate the parametric equation of the spindle motion trajectory, introduce the time parameter, and obtain the trajectory state relationship under the same time dimension: In the above formula, n represents the position number of the spindle, n∈[0,1,2,3,······,k], R represents the impeller radius, ω represents the impeller rotation angular velocity, t represents time, x0 represents the movement position of the spindle on the x-axis that changes with time during the movement, and y0 represents the movement position of the spindle on the y-axis that changes with time during the movement.
4. The continuous braided truss joint-invariant spindle array braiding method according to claim 3 is characterized in that: The step of obtaining the collision relationship of the spindle during the movement according to the trajectory state relationship includes: According to the different directions of movement, the slots storing the two running directions are marked separately; The collision relationship of the spindle during the movement is obtained according to the trajectory state relationship.
5. The continuous braided truss joint-invariant spindle array braiding method according to claim 4, characterized in that: The minimum spindle period is obtained through the collision relationship, and the number of spindle trajectory units is calculated according to the minimum spindle period; When calculating the number of groove wheel notches that the spindles need to be spaced apart according to the number of spindle trajectory units, it includes: The number of spindle track units and the number of groove wheel slots that the spindles need to be spaced apart are calculated using the following formula: In the above formula, q represents the number of spindle track units, that is, the number of slotted sheaves, j represents any positive integer, and p max Indicates the maximum number of spindles that can be accommodated in the track.