Weft stripping device for special loom for weaving high-performance fiber multi-layer heavy fabrics

Abstract

The present invention discloses a weft releasing device for a special loom for weaving high-performance fiber multi-layer heavy fabrics, which comprises a bracket. A first hook driving device and a second hook driving device are arranged at the rear side of the top of the bracket. A hook mounting seat, a first weft withdrawing rod and a second weft withdrawing rod are arranged at the front side of the lower part of the bracket. The left and right sides of the hook mounting seat are hinged with a first weft hanging hook and a second weft hanging hook respectively. The piston rods of the first hook driving device and the second hook driving device are respectively hinged with the rear ends of the first weft hanging hook and the second weft hanging hook through corresponding connecting pieces after passing through the top of the bracket downward. The first weft hanging hook and the second weft hanging hook are located above the first weft withdrawing rod and the second weft withdrawing rod and on the right side of the first weft withdrawing rod and the second weft withdrawing rod. The structure of the present invention is simple, the weft hanging and releasing time is actively controlled, and the action sensitivity is high. The problems of multiple weft insertions during the weaving of multi-layer fabrics and the weft releasing and retraction of the weft yarn during one beating-up are solved, the fabric weaving quality is improved, and the working efficiency is enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of textiles, and particularly relates to a weft removing device for a special loom for weaving high-performance fiber multi-layer thick fabrics. Background Art

[0002] High-performance fiber multi-layer thick three-dimensional fabrics such as carbon fiber are currently rapidly developing reinforcing structural framework materials for a new type of composite material, and are also important basic materials in the fields of aviation, aerospace, national defense, and high technology. The composite material formed with the high-performance fiber multi-layer thick three-dimensional fabric as the framework has excellent properties such as low density, high specific strength, good toughness, high temperature resistance, and oxidation resistance, and thus has become a key material for the main systems such as the structure, engine, braking device, and thermal protection of aircraft and spacecraft, and can be widely applied to high-tech industries such as wind power generation, ocean exploitation, shipbuilding, and automotive lightweighting.

[0003] This kind of high-performance fiber multi-layer thick three-dimensional fabric is woven by a special loom, and the weft removing device is the core device of the weft insertion system of this special loom. Its function is to cooperate with the weft hanging trolley to remove the double-strand weft yarn led by the rapier from the weft feeding end of the loom at the other end, and then separate from the hook of the weft hanging trolley at the weaving shed, forming a looped selvedge. According to the process requirements, since multi-layer fabrics generally beat up after inserting multiple wefts, sometimes when inserting the second weft feeding, the first weft feeding retracts into the shed, resulting in weaving defects, which in turn affect the performance indicators of the subsequent composite material. Especially for composite materials applied to aviation and aerospace, such defects are fatal.

[0004] In the prior art, for example, in the Chinese invention patent application "A novel loom edge knitting mechanism" with the publication number CN102400259A, it is a two-dimensional loom selvage weft yarn clamping mechanism, which is composed of a gear-driven cam, a small rotor, a spring, and a connecting rod to effectively ensure the early closing of the waste selvage shed to clamp the introduced weft yarn terminal device; another example is the Chinese utility model patent "A loom edge knitting mechanism" with the publication number CN207159486U, which is a two-dimensional loom selvage control weft yarn tension mechanism. It is composed of a motor-driven gear, and through the cooperation of a bobbin holder, a fixed tube, a threaded tube, a sleeve rod, a first bolt, a tension rod, and a roller, it solves the problem that the tension rod of the existing loom edge knitting mechanism is not easy to adjust; another example is the Chinese utility model patent "A rapier loom edge knitting mechanism for textile use" with the publication number CN217459739U, which is a two-dimensional loom selvage control mechanism for quickly replacing the hemming needle. It consists of a frame, a cloth guiding roller, and an electric telescopic rod. The telescopic end of the electric telescopic rod is connected to the needle base through a connecting component. An installation groove is opened on one side of the top of the needle base, and a knitting needle is arranged on one side inside the installation groove. A fixing component is arranged on one side of the knitting needle, effectively solving the problem that the knitting needle does not rotate during work, making it more stable. At the same time, it can also fix knitting needles of different sizes, thereby improving the stability of the overall structure.

[0005] However, these prior arts still have the following disadvantages: The prior arts all target single-layer fabrics with ordinary fiber yarns for weaving lightweight fabrics, solving the problems of early closing of the waste selvage shed to clamp the introduced weft yarn terminal, the problem that the tension rod in the edge knitting is not easy to adjust, and the stability problem of the knitting needle during work and the hemming control problem; however, the prior arts cannot solve the problem of the edge knitting of high-performance fiber thick multi-layer fabrics, that is, actively controlling the yarn shedding time of each layer of edge yarn, and cannot meet the requirement of holding the weft yarn without retracting in the shed under the process state of multiple weft insertions and one beating-up in the edge knitting of multi-layer fabrics, resulting in quality defects in the weaving of multi-layer fabrics and greatly affecting the improvement of work efficiency. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a weft yarn shedding device for a special loom for weaving high-performance fiber thick multi-layer fabrics to solve the problem of weft yarn shedding and retraction during multiple weft insertions and one beating-up in the weaving process of multi-layer fabrics.

[0007] To solve the above technical problems and achieve the above technical effects, the present invention is realized through the following technical solutions:

[0008] Weft releasing device for a special loom for weaving high-performance fiber multi-layer heavy fabrics, comprising a bracket, a first hook driving device, a second hook driving device, a first weft hanging hook, a second weft hanging hook, a hook mounting seat, a first yarn withdrawing rod and a second yarn withdrawing rod; the first hook driving device and the second hook driving device are respectively arranged side by side at the rear side of the top of the bracket, the hook mounting seat, the first yarn withdrawing rod and the second yarn withdrawing rod are all arranged at the front side of the lower part of the bracket, the first weft hanging hook and the second weft hanging hook are respectively located on the left and right sides of the hook mounting seat, and the middle and rear parts of the first weft hanging hook and the second weft hanging hook are respectively hinged to the left and right sides of the hook mounting seat, the radius of curvature of the first weft hanging hook is slightly larger than that of the second weft hanging hook, and the driving rods of the first hook driving device and the second hook driving device are respectively hinged to the rear ends of the first weft hanging hook and the second weft hanging hook through corresponding connecting pieces after passing through the top of the bracket downward; the first weft hanging hook and the second weft hanging hook are both located above the first yarn withdrawing rod and the second yarn withdrawing rod and are respectively located on the right sides of the first yarn withdrawing rod and the second yarn withdrawing rod. During installation, the position of the first yarn withdrawing rod is slightly lower than that of the second yarn withdrawing rod.

[0009] Furthermore, the first weft hanging hook and the second weft hanging hook are symmetrically arranged on the left and right sides of the hook mounting seat, and the distances between the first weft hanging hook and the first yarn withdrawing rod and between the second weft hanging hook and the second yarn withdrawing rod are equal.

[0010] Furthermore, the connecting pieces are a slider seat, a first slider and a second slider. The slider seat is arranged on the bracket. The first slider and the second slider are respectively slidably arranged on the left and right sides of the slider seat. The upper ends of the first slider and the second slider are respectively fixedly connected to the driving rods of the first hook driving device and the second hook driving device. The lower ends of the first slider and the second slider are respectively hinged to the rear ends of the first weft hanging hook and the second weft hanging hook.

[0011] Furthermore, the bracket is a C-shaped bracket composed of an upper cross plate, a rear vertical plate and a lower cross plate. The first hook driving device and the second hook driving device are respectively arranged side by side on the rear part of the upper cross plate of the C-shaped bracket. The hook mounting seat is arranged on the front part of the lower cross plate of the C-shaped bracket, and the front side surface of the hook mounting seat is flush with the front side surface of the lower cross plate of the C-shaped bracket. The first yarn withdrawing rod and the second yarn withdrawing rod are fixed on the front part of the lower cross plate of the C-shaped bracket, and the first yarn withdrawing rod and the second yarn withdrawing rod both extend forward beyond the front side surface of the lower cross plate of the C-shaped bracket. The slider seat is fixed on the rear vertical plate of the C-shaped bracket.

[0012] Further, the first weft-retreating rod and the second weft-retreating rod have the same structure, both being a metal rod with multiple bending structures, including a first horizontal rod section, a vertical rod section, a second horizontal rod section, and an inclined rod section. The first horizontal rod section is horizontally and forwardly fixed at the lower part of the bracket. The vertical rod section is vertically and downwardly connected to the front end of the first horizontal rod section. The second horizontal rod section is horizontally and forwardly connected to the bottom end of the vertical rod section. The inclined rod section is forward and inclined upwardly connected to the front end of the second horizontal rod section.

[0013] Further, the first weft-hanging hook and the second weft-hanging hook both include a straight connecting section and an arc hook section. A connecting piece hinge hole for hinging with the connecting piece is provided at the rear end of the straight connecting section. A hook mounting seat hinge hole for hinging with the hook mounting seat is provided at the rear end of the straight connecting section. The rear end of the arc hook section is connected to the front end of the straight connecting section. The whole of the arc hook section is gradually bent downward, and the front end of the arc hook section is round-headed. The curvature radius of the arc hook section of the first weft-hanging hook is slightly larger than that of the arc hook section of the second weft-hanging hook.

[0014] Further, the hook mounting seat hinge hole is designed as an oval hole, which is convenient for fine-tuning the positions of the first weft-hanging hook and the second weft-hanging hook during installation.

[0015] Further, the first hook driving device and the second hook driving device are respectively equipped with a set of independent electrical circuits. At the same time, the first hook driving device and the second hook driving device are both connected to a controller to control the working sequence and working duration of the first hook driving device and the second hook driving device.

[0016] Further, the first hook driving device and the second hook driving device both adopt pen-shaped cylinders. The piston rods of the two pen-shaped cylinders pass through the top of the bracket downward and are respectively hinged to the rear ends of the first weft-hanging hook and the second weft-hanging hook through corresponding connecting pieces.

[0017] A control method for a weft-unwinding device of a special loom for weaving high-performance fiber multi-layer thick fabrics as described above includes:

[0018] When guiding the odd-numbered weft yarn, the first weft-hanging hook drops to hook the weft yarn loop, and the first weft-retreating rod is responsible for pressing the weft yarn loop; at the same time, the second weft-hanging hook remains in the raised state;

[0019] When drawing the even-numbered weft yarns, the second weft-hooking hook descends to hook the loop of this weft yarn, and at the same time, the second yarn-releasing rod is responsible for pressing down the loop of this weft yarn; meanwhile, the first weft-hooking hook rises to release the loop of the weft yarn it has hooked, and only the first yarn-releasing rod is responsible for pressing down the loop of the weft yarn released by the first weft-hooking hook.

[0020] According to the above sequence, the first weft-hooking hook and the second weft-hooking hook are made to alternately descend and rise in a cyclic manner to achieve weft hooking and weft releasing during multiple weft insertions for multi-layer fabrics.

[0021] According to the weaving requirements, after one or several cycles of weft hooking and weft releasing procedures, the loops of the weft yarns pressed under the first yarn-releasing rod and the second yarn-releasing rod will be led away from the first yarn-releasing rod and the second yarn-releasing rod by the corresponding mechanisms.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The weft-releasing device of the present invention has a simple structure, high transmission efficiency, can actively control the time of weft hooking and weft releasing, has high action sensitivity, and effectively solves the problems of weft releasing and retraction during multiple weft insertions and one beating-up for multi-layer fabric weaving, that is, actively controls the weft releasing time of each layer of edge yarns of high-performance fiber thick multi-layer fabrics, realizes the state of holding the weft yarns without retraction in the shuttle box during multiple weft insertions and one beating-up for the woven edge of multi-layer fabrics, and has an obvious effect on improving the weaving quality of fabrics and enhancing work efficiency.

[0024] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the invention and implement it in accordance with the content of the specification, the following takes the preferred embodiments of the present invention and combines with the attached drawings to elaborate in detail as follows. The specific implementation manners of the present invention are given in detail by the following embodiments and their attached drawings. Description of the Drawings

[0025] The attached drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is a left view of the weft-releasing device of the present invention in the initial state;

[0027] Figure 2 is Figure 1 a top view of the weft-releasing device;

[0028] Figure 3 is a left view of the weft-releasing device of the present invention when the first weft-hooking hook is in the working state;

[0029] Figure 4The left view when the second weft hanging hook of the weft removing device of the present invention is in the working state. Detailed implementation manners

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to more clearly understand the purpose, features and advantages of the invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0031] In the following description, certain specific details are set forth in order to provide a thorough understanding of various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.

[0032] Unless the context requires otherwise, throughout the specification and claims, the words "comprise" and its variations such as "comprises" and "having" should be understood in an open, inclusive sense, i.e., to be interpreted as "including, but not limited to".

[0033] References throughout the specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" throughout the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0034] As used in this specification and the appended claims, the singular forms "a" and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally used in its inclusive sense of "and / or" unless the context clearly dictates otherwise.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] See Figure 1 、 2 As shown in, the weft removing device for a special loom for weaving high-performance fiber multi-layer thick fabrics includes a bracket 2, a first hook driving device 101, a second hook driving device 102, a first weft hanging hook 501, a second weft hanging hook 502, a hook mounting seat 7, a first yarn withdrawing rod 601, and a second yarn withdrawing rod 602.

[0037] As an embodiment of the present invention, the bracket 2 is composed of an upper horizontal plate, a rear vertical plate, and a lower horizontal plate, and the upper horizontal plate, the rear vertical plate, and the lower horizontal plate structurally form a C-shaped bracket.

[0038] As an embodiment of the present invention, the first hook driving device 101 and the second hook driving device 102 are respectively arranged side by side on the rear part of the upper horizontal plate of the C-shaped bracket, and the first hook driving device 101 and the second hook driving device 102 are respectively equipped with a set of independent electrical circuits. At the same time, the first hook driving device 101 and the second hook driving device 102 are both connected to a controller to control the working sequence and working duration of the first hook driving device 101 and the second hook driving device 102.

[0039] As an embodiment of the present invention, the first hook driving device 101 and the second hook driving device 102 preferably adopt pen-shaped cylinders. The piston rods of the two pen-shaped cylinders pass through the top of the bracket 2 downward and are respectively connected to the rear ends of the first weft hanging hook 501 and the second weft hanging hook 502 through corresponding connecting pieces.

[0040] As an embodiment of the present invention, the first hook driving device 101 and the second hook driving device 102 can also adopt a motor lead screw nut mechanism to replace the pen-shaped cylinder to realize the lifting and falling of the first weft hanging hook 501 and the second weft hanging hook 502.

[0041] As an embodiment of the present invention, the hook mounting seat 7 is arranged at the front part of the lower horizontal plate of the C-shaped bracket, and the front side surface of the hook mounting seat 7 is flush with the front side surface of the lower horizontal plate of the C-shaped bracket. The first yarn withdrawing rod 601 and the second yarn withdrawing rod 602 are fixed at the front part of the lower horizontal plate of the C-shaped bracket, and the first yarn withdrawing rod 601 and the second yarn withdrawing rod 602 both extend forward beyond the front side surface of the lower horizontal plate of the C-shaped bracket. The position of the first yarn withdrawing rod 601 is slightly lower than the position of the second yarn withdrawing rod 602. Preferably, the position of the first yarn withdrawing rod 601 is 1.5 - 2 mm lower than the position of the second yarn withdrawing rod 602.

[0042] As an embodiment of the present invention, the first yarn withdrawing rod 601 and the second yarn withdrawing rod 602 have the same structure and are both a metal rod with multiple bending structures, including a first horizontal rod section, a vertical rod section, a second horizontal rod section, and an inclined rod section. The first horizontal rod section is horizontally fixed in the lower part of the bracket 2, the vertical rod section is vertically connected to the front end of the first horizontal rod section, the second horizontal rod section is horizontally connected to the bottom end of the vertical rod section, and the inclined rod section is connected to the front end of the second horizontal rod section forward and inclined upward.

[0043] As an embodiment of the present invention, the first weft hanging hook 501 and the second weft hanging hook 502 are symmetrically arranged on the left and right sides of the hook mounting seat 7, and the middle and rear parts of the first weft hanging hook 501 and the second weft hanging hook 502 are respectively hinged to the left and right sides of the hook mounting seat 7. The radius of curvature of the first weft hanging hook 501 is slightly larger than that of the second weft hanging hook 502, so as to avoid mutual interference between the first weft hanging hook 501 and the second weft hanging hook 502 during their respective operations; preferably, the overall length of the first weft hanging hook 501 is 95 mm, the overall length of the second weft hanging hook 502 is 93 mm, and the radius of curvature of the first weft hanging hook 501 is 2 mm larger than that of the second weft hanging hook 502; the piston rods of the first hook driving device 101 and the second hook driving device 102 pass through the upper cross plate of the bracket 2 downward and are respectively hinged to the rear ends of the first weft hanging hook 501 and the second weft hanging hook 502 through corresponding connecting members.

[0044] As an embodiment of the present invention, the connecting member is a slider seat 3, a first slider 401 and a second slider 402. The slider seat 3 is fixed on the rear vertical plate of the C-shaped bracket. The first slider 401 and the second slider 402 are respectively slidably arranged on the left and right sides of the slider seat 3. The upper ends of the first slider 401 and the second slider 402 are respectively fixedly connected to the driving rods of the first hook driving device 101 and the second hook driving device 102, and the lower ends of the first slider 401 and the second slider 402 are respectively hinged to the rear ends of the first weft hanging hook 501 and the second weft hanging hook 502.

[0045] As an embodiment of the present invention, both the first weft hanging hook 501 and the second weft hanging hook 502 are located above the first yarn withdrawing rod 601 and the second yarn withdrawing rod 602, and are respectively located on the right sides of the first yarn withdrawing rod 601 and the second yarn withdrawing rod 602. During installation, the position of the first yarn withdrawing rod 601 is slightly lower than that of the second yarn withdrawing rod 602. Preferably, the position of the first yarn withdrawing rod 601 is 1.5 - 2 mm lower than that of the second yarn withdrawing rod 602, and the distances between the first weft hanging hook 501 and the first yarn withdrawing rod 601 and between the second weft hanging hook 502 and the second yarn withdrawing rod 602 are equal.

[0046] When the first hook driving device 101 drives the first weft hanging hook 501 to lift, the position of the front end of the first weft hanging hook 501 is above the first yarn withdrawing rod 601. When the first hook driving device 101 drives the first weft hanging hook 501 to fall, the position of the front end of the first weft hanging hook 501 is below the first yarn withdrawing rod 601; when the second hook driving device 102 drives the second weft hanging hook 502 to lift, the position of the front end of the second weft hanging hook 502 is below the second yarn withdrawing rod 602. When the second hook driving device 102 drives the second weft hanging hook 502 to fall, the position of the front end of the second weft hanging hook 502 is below the second yarn withdrawing rod 602; the first yarn withdrawing rod 601 and the second yarn withdrawing rod 602 are separated left and right, respectively playing the role of pressing the edges of the weft yarn.

[0047] As an embodiment of the present invention, both the first weft hanging hook 501 and the second weft hanging hook 502 include a straight connecting section and an arc hook section. A connecting piece hinge hole for hinging with the connecting piece is provided at the rear end of the straight connecting section, and a hook mounting seat hinge hole for hinging with the hook mounting seat 7 is provided at the rear end of the straight connecting section. The rear end of the arc hook section is connected to the front end of the straight connecting section. The whole of the arc hook section gradually bends downward, and the front end of the arc hook section is round-headed; the structures of the first weft hanging hook 501 and the second weft hanging hook 502 are basically the same, only the curvature radius of the arc hook section of the first weft hanging hook 501 is slightly larger than the curvature radius of the arc hook section of the second weft hanging hook 502; preferably, the overall length of the first weft hanging hook 501 is 95 mm, and the overall length of the second weft hanging hook 502 is 93 mm. Preferably, the curvature radius of the arc hook section of the first weft hanging hook 501 is 2 mm larger than the curvature radius of the arc hook section of the second weft hanging hook 502, so as to avoid mutual interference between the first weft hanging hook 501 and the second weft hanging hook 502 during their respective weft hanging and weft shedding.

[0048] As an embodiment of the present invention, the hook mounting seat hinge hole is designed as a waist-shaped hole, which is convenient for fine-tuning the positions of the first weft hanging hook 501 and the second weft hanging hook 502 during installation.

[0049] When the weft shedding device of the present invention is in use, it is installed on the left side in front of the special loom, opposite to the weft feeding device on the right side in front of the special loom. Based on this, referring to Figure 1 、 3 、shown in Figure 4, the present invention also provides a control method for a weft shedding device of a special loom for weaving high-performance fiber multi-layer thick fabrics, including:

[0050] When drawing the first single weft yarn, the first weft - hanging hook 501 drops to hook the loop of this weft yarn, and the first yarn - withdrawing rod 601 is responsible for pressing down on the loop of this weft yarn; at the same time, the second weft - hanging hook 502 remains in the raised state;

[0051] When drawing the second even - numbered weft yarn, the second weft - hanging hook 502 drops to hook the loop of this weft yarn, and at the same time the second yarn - withdrawing rod 602 is responsible for pressing down on the loop of this weft yarn; at the same time, the first weft - hanging hook 501 rises to release the loop of the weft yarn it has hooked, and only the first yarn - withdrawing rod 601 is responsible for pressing down on the loop of the weft yarn released by the first weft - hanging hook 501;

[0052] According to the above sequence, the first weft - hanging hook 501 and the second weft - hanging hook 502 work in an alternating cycle of dropping and rising, achieving weft - hanging and weft - releasing during multiple weft insertions for multi - layer fabrics;

[0053] According to the weaving requirements, after one or several cycles of weft - hanging and weft - releasing procedures, the loops of weft yarn pressed under the first yarn - withdrawing rod 601 and the second yarn - withdrawing rod 602 will be drawn away from the first yarn - withdrawing rod 601 and the second yarn - withdrawing rod 602 by the corresponding mechanism.

[0054] The specific process of weft - hanging and weft - releasing is as follows:

[0055] S1. When the rapier sword finishes drawing the sword, the weft - feeding carriage holds the loop of the weft yarn to the positions of the first weft - hanging hook 501 and the second weft - hanging hook 502. At this time, the first weft - hanging hook 501 and the second weft - hanging hook 502 are both in the raised state driven by the first hook driving device 101 and the second hook driving device 102;

[0056] S2. When drawing the first weft yarn, the first hook driving device 101 drives the first weft - hanging hook 501 to rotate downward, hook the loop of the first weft yarn, and the first yarn - withdrawing rod 601 presses down on the loop of the first weft yarn; at this time, the second weft - hanging hook 502 remains in the raised state;

[0057] S3. When drawing the second weft yarn, the second hook driving device 102 drives the second weft - hanging hook 502 to rotate downward, hook the loop of the second weft yarn, and the second yarn - withdrawing rod 602 presses down on the loop of the second weft yarn; at the same time, the first hook driving device 101 drives the first weft - hanging hook 501 to rotate upward, release the loop of the first weft yarn, preparing for weft - hanging when drawing the third weft yarn. The loop of the first weft yarn after weft - releasing is pressed by the first yarn - withdrawing rod 601;

[0058] S4. When the third weft yarn is inserted, the first hook driving device 101 drives the first weft-hanging hook 501 to rotate downward to hook the third weft yarn loop, and the first yarn-releasing rod 601 presses the first and third weft yarn loops simultaneously. At the same time, the second hook driving device 102 drives the second weft-hanging hook 502 to rotate upward to remove the second weft yarn loop, preparing for hanging the weft yarn when the fourth weft yarn is inserted. The second weft yarn loop after weft removal is pressed by the second yarn-releasing rod 602.

[0059] S5. When the fourth weft yarn is inserted, the second hook driving device 102 drives the second weft-hanging hook 502 to rotate downward to hook the fourth weft yarn loop, and the second yarn-releasing rod 602 presses the second and fourth weft yarn loops simultaneously. At the same time, the first hook driving device 101 drives the first weft-hanging hook 501 to rotate upward to remove the third weft yarn loop, preparing for hanging the weft yarn when the fifth weft yarn is inserted. The first and third weft yarn loops after weft removal are pressed by the first yarn-releasing rod 601.

[0060] S6. Then, continue to work in cycles according to the steps of S2 to S5, thereby realizing the weft-holding non-retracting shed in the process of multiple weft insertions and single beat-up for the woven edge of multi-layer fabrics.

[0061] It should be noted that the weft yarn loop after weft removal is not always pressed under the first yarn-releasing rod 601 and the second yarn-releasing rod 602, nor is it immediately pulled away from the first yarn-releasing rod 601 and the second yarn-releasing rod 602. Instead, according to the weaving requirements, after going through one or several cycles of weft hanging and weft removal procedures, it will be gradually or batchwise pulled away from the first yarn-releasing rod 601 and the second yarn-releasing rod 602 by the corresponding mechanism, preparing for the subsequent beat-up work of weaving.

[0062] The weft-removing device of the present invention has a simple structure and high transmission efficiency. It can actively control the weft hanging and weft removal time with high action sensitivity, effectively solving the problem of weft retraction during multiple weft insertions and single beat-up in multi-layer fabric weaving, that is, actively controlling the weft removal time of each layer of edge yarn in high-performance fiber thick multi-layer fabrics, realizing the weft-holding non-retracting shed in the process of multiple weft insertions and single beat-up for the woven edge of multi-layer fabrics, and having an obvious effect on improving the fabric weaving quality and enhancing the working efficiency.

[0063] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Weft stripping device for special loom for weaving high-performance fiber multi-layer heavy fabrics, characterized in that: It includes a bracket (2), a first hook driving device (101), a second hook driving device (102), a first weft hanging hook (501), a second weft hanging hook (502), a hook mounting seat (7), a first yarn withdrawing rod (601) and a second yarn withdrawing rod (602); the first hook driving device (101) and the second hook driving device (102) are respectively arranged side by side at the rear side of the top of the bracket (2), the hook mounting seat (7), the first yarn withdrawing rod (601) and the second yarn withdrawing rod (602) are all arranged at the front side of the lower part of the bracket (2), the first weft hanging hook (501) and the second weft hanging hook (502) are respectively located on the left and right sides of the hook mounting seat (7), and the middle and rear parts of the first weft hanging hook (501) and the second weft hanging hook (502) are respectively hinged to the left and right sides of the hook mounting seat (7), the radius of curvature of the first weft hanging hook (501) is slightly larger than that of the second weft hanging hook (502), and the driving rods of the first hook driving device (101) and the second hook driving device (102) are respectively hinged to the rear ends of the first weft hanging hook (501) and the second weft hanging hook (502) through corresponding connecting parts after passing through the top of the bracket (2) downward; both the first weft hanging hook (501) and the second weft hanging hook (502) are located above the first yarn withdrawing rod (601) and the second yarn withdrawing rod (602), and are respectively located on the right sides of the first yarn withdrawing rod (601) and the second yarn withdrawing rod (602). During installation, the position of the first yarn withdrawing rod (601) is slightly lower than that of the second yarn withdrawing rod (602).

2. The weft stripping device for a special loom for weaving high-performance fiber multi-layer heavy fabrics according to claim 1, characterized in that: The first weft hanging hook (501) and the second weft hanging hook (502) are symmetrically arranged on the left and right sides of the hook mounting seat (7), and the distance between the first weft hanging hook (501) and the first yarn withdrawing rod (601) is equal to the distance between the second weft hanging hook (502) and the second yarn withdrawing rod (602).

3. The weft releasing device for the special loom for weaving high-performance fiber multi-layer heavy fabrics according to claim 1, characterized in that: The connecting parts are a slider seat (3), a first slider (401) and a second slider (402). The slider seat (3) is arranged on the bracket (2), the first slider (401) and the second slider (402) are respectively slidably arranged on the left and right sides of the slider seat (3) up and down, the upper ends of the first slider (401) and the second slider (402) are respectively fixedly connected to the driving rods of the first hook driving device (101) and the second hook driving device (102), and the lower ends of the first slider (401) and the second slider (402) are respectively hinged to the rear ends of the first weft hanging hook (501) and the second weft hanging hook (502).

4. The weft decelerating device for the special loom for weaving high-performance fiber multi-layer thick fabrics according to claim 3, characterized in that: The bracket (2) is a C-shaped bracket consisting of an upper horizontal plate, a rear vertical plate, and a lower horizontal plate. The first hook driving device (101) and the second hook driving device (102) are respectively arranged side by side on the rear part of the upper horizontal plate of the C-shaped bracket. The hook mounting seat (7) is arranged on the front part of the lower horizontal plate of the C-shaped bracket, and the front side surface of the hook mounting seat (7) is flush with the front side surface of the lower horizontal plate of the C-shaped bracket. The first yarn withdrawal rod (601) and the second yarn withdrawal rod (602) are fixed on the front part of the lower horizontal plate of the C-shaped bracket, and the first yarn withdrawal rod (601) and the second yarn withdrawal rod (602) both extend forward from the front side surface of the lower horizontal plate of the C-shaped bracket. The slider seat (3) is fixed on the rear vertical plate of the C-shaped bracket.

5. The weft stripping device for a special loom for weaving high-performance fiber multi-layer heavy fabrics according to claim 1, characterized in that: The first yarn withdrawing rod (601) and the second yarn withdrawing rod (602) have the same structure and are both a metal rod with a plurality of bending structures, comprising a first cross bar section, a vertical bar section, a second cross bar section and an oblique bar section, wherein the first cross bar section is fixed horizontally forward to the lower part of the bracket (2), the vertical bar section is vertically downwardly connected to the front end of the first cross bar section, the second cross bar section is horizontally forwardly connected to the bottom end of the vertical bar section, and the oblique bar section is connected forwardly and obliquely upward to the front end of the second cross bar section.

6. The weft stripping device for a special loom for weaving high-performance fiber multi-layer heavy fabrics according to claim 1, characterized in that: The first weft hanging hook (501) and the second weft hanging hook (502) both comprise a straight connecting section and an arc hook section, the rear end of the straight connecting section being provided with a connecting piece hinge hole for being hinged to the connecting piece, the rear end of the straight connecting section being provided with a hook mounting seat hinge hole for being hinged to the hook mounting seat (7), the rear end of the arc hook section being connected to the front end of the straight connecting section, the entire arc hook section being gradually bent downward, and the front end of the arc hook section being rounded, the curvature radius of the arc hook section of the first weft hanging hook (501) being slightly larger than the curvature radius of the arc hook section of the second weft hanging hook (502).

7. The weft stripping device for a special loom for weaving high-performance fiber multi-layer thick fabrics according to claim 6, characterized in that: The hinge hole of the hook mounting seat adopts a waist-shaped hole design, which facilitates fine adjustment of the position of the first weft hanging hook (501) and the second weft hanging hook (502) during installation.

8. The weft decelerating device for the special loom for weaving high-performance fiber multi-layer heavy fabrics according to claim 1, characterized in that: The first hook driving device (101) and the second hook driving device (102) are each equipped with a set of independent electrical circuits. At the same time, the first hook driving device (101) and the second hook driving device (102) are both connected to a controller to control the working sequence and working duration of the first hook driving device (101) and the second hook driving device (102).

9. The weft releasing device for the special loom for weaving high-performance fiber multi-layer thick fabrics according to claim 1, characterized in that: The first hook driving device (101) and the second hook driving device (102) both use pen-shaped cylinders, and the piston rods of the two pen-shaped cylinders pass downward through the top of the bracket (2) and are respectively hinged to the rear ends of the first weft hanging hook (501) and the second weft hanging hook (502) through corresponding connecting pieces.

10. A control method for a weft decelerating device according to any one of claims 1-9, characterized in that, include: When drawing the first single weft yarn, the first weft-hanging hook (501) drops to hook the loop of this weft yarn, and the first yarn-retreating rod (601) is responsible for pressing down the loop of this weft yarn; at the same time, the second weft-hanging hook (502) remains in the raised state; When drawing the second even weft yarn, the second weft-hanging hook (502) drops to hook the loop of this weft yarn, and at the same time the second yarn-retreating rod (602) is responsible for pressing down the loop of this weft yarn; at the same time, the first weft-hanging hook (501) lifts up to release the loop of the weft yarn it has hooked, and only the first yarn-retreating rod (601) is responsible for pressing down the loop of the weft yarn released by the first weft-hanging hook (501); According to the above sequence, the first weft-hanging hook (501) and the second weft-hanging hook (502) alternately drop and lift in a cyclic manner to achieve weft hanging and weft releasing during multiple weft insertions for multi-layer fabrics; According to the weaving requirements, after one or several cycles of weft hanging and weft releasing procedures, the loops of the weft yarns pressed under the first yarn-retreating rod (601) and the second yarn-retreating rod (602) will be led away from the first yarn-retreating rod (601) and the second yarn-retreating rod (602) by the corresponding mechanisms.

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