A three-dimensional woven preform weft insertion mechanism

Abstract

The application discloses a three-dimensional woven preform weft insertion mechanism, comprising a beating-up support, a weft selection mechanism, a rapier traction mechanism, an auxiliary yarn clamping mechanism and a yarn cutting mechanism; the weft selection mechanism is installed at one end of the beating-up support and comprises a weft selection yarn feeding mechanism, which can move vertically and left and right relative to the beating-up support; the rapier traction mechanism is installed at the other end of the beating-up support and comprises a rapier, which can move vertically and forward and backward relative to the beating-up support; the auxiliary yarn clamping mechanism is two in number and is installed at the left and right ends of the beating-up support and can move vertically relative to the beating-up support; the yarn cutting mechanism is installed at one end of the beating-up support where the weft selection mechanism is installed. The weft selection mechanism and the rapier traction mechanism are vertically moved, the rapier is used for weft insertion of yarn in different areas up and down, the application reduces the overall space occupied, the application does not need to replace the yarn accumulator, and the weaving efficiency of the three-dimensional woven preform is improved.

Description

Technical Field

[0001] This invention relates to a three-dimensional woven preform weft insertion mechanism, belonging to the field of textile machinery technology. Background Technology

[0002] Multi-layered three-dimensional preforms are typically thick, large, and complex in shape. Due to the numerous layers and diverse weft yarn specifications, the weft insertion motion becomes one of the key technologies in preform weaving. Traditional multi-layered three-dimensional preforms typically employ alternating weft insertion motions with three or more rapiers and a single-rapier movable weft insertion motion with a single specification. In the alternating weft insertion motion with three or more rapiers, the rapiers are distributed on the same side of the preform, with each rapier inserting the weft yarn within a certain area. Within this area, the rapiers sequentially introduce the weft yarn from top to bottom. This weft insertion device design is complex, occupies a large space, and has low weaving efficiency. On the other hand, the single-rapier movable weft insertion motion can only be used for one type of yarn bundle (as disclosed in Chinese invention patent application CN112522838A). If different yarn bundles are needed during the weaving of the same preform, the yarn storage device needs to be replaced, affecting weaving efficiency.

[0003] With the development trend of multi-layer three-dimensional preforms, the requirements for their weaving efficiency and quality are becoming increasingly stringent. The original woven fabrication methods can no longer meet the needs of this field. The main technical bottlenecks are the complex weft insertion process affecting weaving efficiency and the need for weft insertion of multiple specifications of yarn bundles for weaving the same fabric. Therefore, it is necessary to invent a weft insertion mechanism for multi-layer preforms to improve weaving efficiency and quality and meet the market demand for three-dimensional preforms. Summary of the Invention

[0004] The purpose of this invention is to provide a three-dimensional woven prefabricated weft insertion mechanism to solve the technical defects of existing weft insertion devices, such as large space occupation and low weaving efficiency.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a three-dimensional woven prefabricated weft insertion mechanism, including a weft insertion support, a weft selection mechanism, a rapier traction mechanism, an auxiliary yarn clamping mechanism, and a yarn cutting mechanism; the weft selection mechanism is installed at one end of the weft insertion support, and includes a weft selection and yarn feeding mechanism, which can move vertically and left and right relative to the weft insertion support. The vertical movement of the weft selection and yarn feeding mechanism is used to feed yarn to different layers of the three-dimensional woven prefabricated body, and the left and right movement of the weft selection and yarn feeding mechanism is used for left and right weft selection; the rapier traction mechanism is installed at the other end of the weft insertion support, and includes a rapier, which can move vertically and back and forth relative to the weft insertion support. The vertical movement of the rapier coordinates with the vertical movement of the weft selection and feeding mechanism to pull yarns onto the three-dimensional woven prefabricated body of different layers. The forward and backward movement of the rapier is used to clamp and pull the weft yarns on the weft selection and feeding mechanism. There are two auxiliary yarn clamping mechanisms, which are installed at the left and right ends of the weft insertion bracket and can move vertically relative to the weft insertion bracket. The auxiliary yarn clamping mechanisms are used to clamp the weft yarns from the weft selection mechanism and the rapier traction mechanism after the yarns are pulled by the rapier traction mechanism. The yarn cutting mechanism is set at one end of the weft insertion bracket where the weft selection mechanism is installed, and moves synchronously with the vertical movement of the weft selection mechanism. It is used to cut the weft yarns from the weft selection mechanism after the auxiliary yarn clamping mechanism clamps the weft yarns. This invention enables the rapier to guide weft threads into different areas by vertically moving the weft selection mechanism and the rapier traction mechanism. Therefore, this invention can achieve weft threading into different areas with only one rapier. Compared with the existing technology that uses three or more rapiers, this invention reduces the overall space occupied. Compared with the existing technology that uses a single rapier and a single specification of movable weft threading action, this invention does not require replacing the yarn storage device because both the weft selection mechanism and the rapier traction mechanism can move vertically. Therefore, it improves the weaving efficiency of the three-dimensional woven prefabricated body. This invention can achieve online automatic yarn selection for different specifications of yarn bundles, thereby improving the weaving quality.

[0006] As a further improvement of the present invention, the weft selection mechanism further includes a weft selection lifting plate, a weft selection lifting drive device, and left and right drive motors. The weft selection lifting plate is mounted on the weft-beating bracket and forms a vertical moving pair with the weft-beating bracket. The weft selection and yarn feeding mechanism is mounted on the weft selection lifting plate and can slide on the weft selection lifting plate in the left and right direction. The weft selection lifting drive device is connected to the weft selection lifting plate and is used to drive the weft selection lifting plate to move vertically on the weft-beating bracket. The left and right drive motors are mounted on the weft selection lifting plate and are used to drive the weft selection and yarn feeding mechanism to move left and right on the weft selection lifting plate. The present invention, by setting a weft selection lifting plate, drives the weft selection lifting plate to move vertically, causing the weft selection and yarn feeding mechanism mounted on the weft selection lifting plate to move up and down relative to the weft-beating bracket. The left and right drive motors drive the weft selection and yarn feeding mechanism to move left and right on the weft selection lifting plate. Since the weft selection lifting plate can only move vertically relative to the weft-beating bracket and cannot move left and right, the left and right movement of the weft selection and yarn feeding mechanism relative to the weft selection lifting plate causes the weft selection and yarn feeding mechanism to move left and right relative to the weft-beating bracket.

[0007] As a further improvement of the present invention, the weft selection mechanism further includes a weft selection and yarn feeding mounting base, which includes two weft selection side plates, a weft selection base plate, a motor mounting plate, and multiple guide rods. The two weft selection side plates are respectively installed on the left and right sides of the weft selection lifting plate and move synchronously with the vertical movement of the weft selection side plates. The two ends of the weft selection base plate are respectively connected to the two weft selection side plates and move synchronously with the movement of the weft selection side plates. The weft selection and yarn feeding mechanism is slidably installed on the weft selection base plate, and the yarn cutting mechanism is installed on the weft selection base plate. The motor mounting plate is located below the weft selection base plate, and the two ends of the motor mounting plate are respectively connected to the two weft selection side plates. The left and right drive motors are installed on the motor mounting plate. The two ends of the guide rods are respectively connected to the two weft selection side plates. The weft yarn passes around the guide rods and through the weft selection and yarn feeding mechanism, and is fed by the weft selection and yarn feeding mechanism. This invention features a weft selection and yarn feeding mounting base, which is installed on a weft selection lifting plate. The weft selection and yarn feeding mechanism is then slidably mounted on the mounting base, facilitating the sliding installation of the weft selection and yarn feeding mechanism and the weft selection lifting plate. In use, the weft yarn bypasses the guide rod, which then feeds the weft yarn, preventing tangling and knotting, thus facilitating the continuous weaving of the three-dimensional woven prefabricated body.

[0008] As a further improvement of the present invention, it also includes a weft selection fixing plate, which is mounted on the weft insertion bracket using multiple horizontal weft selection support columns, and a space for accommodating the weft selection lifting plate is formed between the weft selection fixing plate and the weft insertion bracket; the weft selection lifting plate is disposed between the weft selection fixing plate and the weft insertion bracket, and is slidably mounted on the weft selection fixing plate by means of a guide rail and a slider. The present invention, by setting the weft selection fixing plate and placing the weft selection lifting plate between the weft selection fixing plate and the weft insertion bracket, improves the stability of the weft selection lifting plate installation.

[0009] As a further improvement of the present invention, the yarn shearing mechanism includes a stationary blade, a moving blade, and a yarn shearing drive cylinder; the stationary blade is mounted on the weft selection lifting plate; the moving blade is rotatably mounted on the weft selection lifting plate via a scissor shaft; the yarn shearing drive cylinder is mounted on the weft selection lifting plate, and the piston rod of the yarn shearing drive cylinder is rotatably connected to one end of the moving blade. The extension and retraction of the piston rod of the yarn shearing drive cylinder is used to drive the moving blade to rotate relative to the weft selection lifting plate, and cooperate with the stationary blade to cut the weft yarn. In the present invention, the shearing mechanism is changed from a motor-driven cutting blade to a system of stationary and moving blades. The moving blade is driven to rotate by the yarn shearing drive cylinder to cut the yarn. The overall structure is more compact and flexible, requiring only one yarn shearing drive cylinder, while the stationary blade remains stationary. The operation time of the present invention is shorter, and it is safer and more reliable.

[0010] As a further improvement of the present invention, the rapier traction mechanism further includes a rapier lifting plate and a linear module; the rapier lifting plate is mounted on the weft insertion bracket and forms a vertical sliding pair with the weft insertion bracket; a rapier support is mounted on the upper part of the rapier lifting plate, the rapier is mounted on the rapier support, and can move along the front-back direction on the rapier support; the linear module is mounted on the rapier support and connected to the rapier, and is used to drive the rapier to move on the rapier support. In the present invention, the rapier lifting plate is slidably mounted on the weft insertion bracket, and the rapier traction mechanism moves vertically on the weft insertion bracket by the vertical movement of the rapier lifting plate relative to the weft insertion bracket.

[0011] As a further improvement of the present invention, the rapier traction mechanism also includes a traction fixing plate. The traction fixing plate is mounted on the weft insertion bracket using multiple horizontal traction support columns, forming a space between the traction fixing plate and the weft insertion bracket to accommodate the rapier lifting plate. The rapier lifting plate is located between the traction fixing plate and the weft insertion bracket and is slidably mounted on the traction fixing plate using a guide rail and slider combination. The present invention, by setting up a traction fixing plate, allows the rapier lifting plate to move vertically on the weft insertion bracket through the relative sliding between the rapier lifting plate and the traction fixing plate, and the fixed connection between the traction fixing plate and the weft insertion bracket. Because the rapier lifting plate is located between the traction fixing plate and the weft insertion bracket, the overall installation structure of the rapier lifting plate has better stability.

[0012] As a further improvement of the present invention, a roller support bracket is installed on the top of the rapier lifting plate, and four rollers are rotatably mounted on the roller support bracket. These four rollers support the rapier from the top, bottom, left, and right, respectively, and rotate relative to the rapier when it is moving. The present invention, by setting up rollers, provides support and guidance for the rapier, and the rotation of the rollers reduces the resistance during the movement of the rapier.

[0013] As a further improvement of the present invention, the rapier traction mechanism further includes a rapier fixing seat, which is slidably mounted on the rapier support and driven by the linear module to move back and forth on the rapier support. The end of the rapier away from the weft selection mechanism is fixed to the rapier fixing seat, and the movement of the rapier fixing seat on the rapier support pushes the rapier to move back and forth. The present invention provides a rapier fixing seat, which moves on the rapier support to push the rapier to move back and forth on the rapier support.

[0014] As a further improvement of the present invention, the auxiliary yarn clamping mechanism includes a mounting plate, an up-and-down drive cylinder, a left-and-right drive cylinder, a clamp A, and a clamp B. The mounting plate is mounted on the weft insertion bracket. The cylinder body of the up-and-down drive cylinder is mounted on the mounting plate. The cylinder body of the left-and-right drive cylinder is mounted on the piston rod of the up-and-down drive cylinder, and the piston rod of the up-and-down drive cylinder extends and retracts to drive the left-and-right drive cylinder to move up and down. Clamp A is mounted on the cylinder body of the left-and-right drive cylinder, and the piston rod of the left-and-right drive cylinder passes through clamp A. Clamp B is mounted on the piston rod of the left-and-right drive cylinder, and the extension and retraction of the piston rod of the left-and-right drive cylinder drives clamp B to move toward or away from clamp A, for clamping or releasing the weft yarn located between clamp B and clamp A. In this invention, the extension and retraction of the piston rod of the left-and-right drive cylinder drives clamp B to move toward or away from clamp A, thereby clamping or releasing the weft yarn. The up-and-down drive cylinder drives the left-and-right drive cylinder to move up and down. When the rapier is drawing yarn, clamp A and clamp B are pulled downwards to avoid interfering with the rapier's yarn drawing process.

[0015] In summary, the beneficial effects of this invention are as follows: This invention reduces waiting time and improves efficiency. The addition of two auxiliary yarn clamping mechanisms allows the weft yarn to be quickly clamped after the rapier returns to its original position with the weft yarn. The rapier clamping mechanism can release the yarn directly without waiting, while the yarn cutting mechanism cuts the yarn simultaneously. This reduces the number of actions requiring control in the clamping mechanism, improves weft insertion efficiency, increases work efficiency, and enhances the automation level of the equipment. The cutting mechanism in this invention changes from a motor-driven cutting blade to a scissor-type cutting blade, driven by a cylinder. This results in a more compact and flexible structure, requiring only one cylinder for driving while the other half of the cutting blade remains stationary, leading to shorter action time and greater safety and reliability. This invention employs a weft selection and feeding mechanism in conjunction with the weft insertion rapier to pull the weft yarn, mimicking the nozzle of an air-jet loom. By adjusting the air pressure to control the speed and intensity of the airflow, the weft yarn is kept in a fixed position for easy clamping by the rapier clamp, shortening the action time. This invention effectively reduces costs, improves production efficiency, generates good economic benefits, and possesses high technical value. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a top view of the weft selection mechanism in this invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the weft selection mechanism in this invention.

[0019] Figure 4 This is a three-dimensional structural diagram of the weft selection mechanism in this invention from another angle.

[0020] Figure 5 yes Figure 4A magnified view of a portion of point A in the middle.

[0021] Figure 6 This is a three-dimensional structural diagram of the rapier traction mechanism in this invention.

[0022] Figure 7 This is a three-dimensional structural diagram of the rapier traction mechanism in this invention from another angle.

[0023] Figure 8 This is a three-dimensional structural diagram of the auxiliary yarn clamping mechanism in this invention.

[0024] The components include: 1. Weft selection mechanism; 101. Weft selection lifting drive device; 102. Weft selection lifting motor mounting plate; 103. Weft selection coupling; 104. Weft selection lead screw connecting plate; 105. Weft selection lead screw slider; 106. Weft selection ball screw; 107. Weft selection bearing seat; 108. Weft selection fixing plate; 109. Weft selection slider; 110. Left and right drive motors; 111. Weft selection lifting plate; 112. Motor mounting plate. 113. Mounting plate; 114. Rack; 115. Gear; 116. Weft selection support column; 117. Weft selection base plate; 118. Left and right linear guide rails; 119. Yarn cutting mechanism; 110. Stationary blade; 1111. Moving blade; 1121. Scissor shaft; 113. Yarn cutting drive cylinder; 114. Weft selection yarn feeding mechanism; 125. Weft selection top plate; 126. Guide rod; 127. Weft selection side plate; 128. Weft selection protective plate.

[0025] 2. Rapier traction mechanism; 201. Rapier lifting motor; 202. Rapier lifting motor mounting plate; 203. Rapier lifting plate; 204. Traction support column; 205. Support roller; 206. Support roller fixing plate; 207. Support roller bracket; 208. Rapier; 209. Rapier fixing component; 210. Rapier support component; 211. Rapier fixing seat; 212. Linear module; 213. Rapier coupling; 214. Traction fixing plate; 215. Rapier lead screw connecting plate; 216. Rapier lead screw slider; 217. Rapier lead screw bearing seat; 218. Rapier slider; 219. Rapier ball screw; 220. Traction protection plate.

[0026] 3. Auxiliary yarn clamping mechanism; 301. Mounting plate; 302. Cylinder fixing seat; 303. Left and right drive cylinders; 304. Gripper A; 305. Gripper B; 306. Up and down drive cylinders.

[0027] 4. Weft insertion bracket; 401. Front upright plate; 402. Rear upright plate; 403. Connecting base plate; 404. Triangular reinforcing plate. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1The three-dimensional woven prefabricated weft insertion mechanism shown includes a weft insertion bracket 4, a weft selection mechanism 1, a rapier traction mechanism 2, an auxiliary yarn clamping mechanism 3, and a yarn cutting mechanism 118. The weft insertion bracket 4 includes a front upright plate 401, a rear upright plate 402, a connecting base plate 403, and a triangular reinforcing plate 404. The front upright plate 401 and the rear upright plate 402 are arranged in parallel. The front and rear ends of the connecting base plate 403 are fixedly connected to the bottom of the front upright plate 401 and the rear upright plate 402, respectively, so that the entire weft insertion bracket 4 is in the shape of a "U". Triangular reinforcing plates 404 are fixed at the connection between the front upright plate 401 and the connecting base plate 403 and at the connection between the rear upright plate 402 and the connecting base plate 403 to improve the overall connection strength of the weft insertion bracket 4.

[0030] like Figures 2 to 4 As shown, the weft selection mechanism 1 is installed on the front upright plate 401 of the weft insertion bracket 4. The weft selection mechanism 1 includes a weft selection and yarn feeding mechanism 119. The weft selection and yarn feeding mechanism 119 in this invention is prior art and will not be described in detail in this invention. The weft selection and yarn feeding mechanism 119 can move vertically and horizontally relative to the weft insertion bracket 4. The vertical movement of the weft selection and yarn feeding mechanism 119 is used to feed yarn to different layers of three-dimensional woven preforms. After weaving one layer of preform, the weft selection and yarn feeding mechanism 119 moves upward to weave another layer of structure on the top of the preform, thereby weaving a complete multi-layer preform. The horizontal movement of the weft selection and yarn feeding mechanism 119 is used for left and right weft selection.

[0031] like Figures 2 to 4 As shown, in order to move the weft selection and feeding mechanism 119 left and right, the weft selection mechanism 1 of the present invention is provided with a weft selection lifting plate 111, a weft selection lifting drive device 101, and a left and right drive motor 110; the weft selection lifting plate 111 is installed on the front upright plate 401 of the weft insertion bracket 4 and forms a vertical moving pair with the front upright plate 401 of the weft insertion bracket 4; the weft selection and feeding mechanism 119 is installed on the weft selection lifting plate 111 and can slide on the weft selection lifting plate 111 in the left and right direction; the present invention uses the vertical movement of the weft selection lifting plate 111 on the front upright plate 401... The weft selection and feeding mechanism 119 moves vertically on the weft insertion bracket 4, while the weft selection and feeding mechanism 119 moves left and right on the weft selection lifting plate 111, thus realizing the left and right movement of the weft selection and feeding mechanism 119 on the weft insertion bracket 4; the weft selection lifting drive device 101 in this invention is connected to the weft selection lifting plate 111 to drive the weft selection lifting plate 111 to move vertically on the weft insertion bracket 4, and the left and right drive motor 110 is installed on the weft selection lifting plate 111 to drive the weft selection and feeding mechanism 119 to move left and right on the weft selection lifting plate 111.

[0032] like Figures 2 to 4As shown, in order to facilitate the installation of the weft selection and feeding mechanism 119 on the weft selection lifting plate 111, the weft selection mechanism 1 of the present invention is provided with a weft selection and feeding mounting base. The weft selection and feeding mounting base includes two weft selection side plates 122, a weft selection bottom plate 116, a motor mounting plate 112, a weft selection top plate 120, and multiple guide rods 121. The two weft selection side plates 122 are parallel and are detachably installed on the left and right sides of the weft selection lifting plate 111 by bolts. The weft selection side plates 122 move synchronously with the vertical movement of the weft selection side plates 122. The left and right ends of the weft selection top plate 120 are detachably installed on the top of the two weft selection side plates 122 by bolts. A notch is opened on the top of the weft selection top plate 120 for the weft yarn to pass through in the use state. The two ends of the weft-selecting base plate 116 are detachably connected to the two weft-selecting side plates 122 by bolts, and the weft-selecting base plate 116 moves synchronously with the movement of the weft-selecting side plates 122. The weft-selecting yarn feeding mechanism 119 is slidably mounted on the weft-selecting base plate 116. In this invention, left and right linear guide rails 117 are detachably mounted on the weft-selecting base plate 116 in the left and right direction by bolts. Left and right sliders (not shown in the figure) are detachably mounted on the bottom of the weft-selecting yarn feeding mechanism 119 by bolts. The left and right sliders cooperate with the left and right linear guide rails 117. The linear sliding of the left and right sliders on the left and right linear guide rails 117 causes the weft-selecting yarn feeding mechanism 119 to move left and right on the weft-selecting base plate 116, thereby causing the weft-selecting yarn feeding mechanism 119 to move left and right relative to the weft-selecting lifting plate 111. The yarn-cutting mechanism 118 in this invention is mounted on the weft-selecting base plate 116. In this invention, the motor mounting plate 112 is located below the weft selection base plate 116, and both ends of the motor mounting plate 112 are detachably connected to the two weft selection side plates 122 by bolts. The left and right drive motors 110 are detachably mounted on the motor mounting plate 112 by bolts. In this invention, a gear 114 is mounted on the output shaft of the left and right drive motors 110, and a rack 113 is detachably mounted on the bottom of one side of the weft selection and yarn feeding mechanism 119 by bolts. The teeth of the rack 113 are located at the bottom of the rack 113, and the gear 114 meshes with the rack 113. The left and right drive motors 110 drive the gear 114 to rotate, and the gear 114 drives the rack 113 to move left and right. The movement of the rack 113 drives the weft selection and yarn feeding mechanism 119 to move left and right. The number of guide rods 121 in this invention is preferably set to three. The two ends of the three guide rods 121 are respectively connected to two weft selection side plates 122. The weft yarn passes around the guide rods 121 in sequence and then passes through the weft selection yarn feeding mechanism 119, which feeds the yarn.

[0033] like Figures 2 to 4As shown, to facilitate the sliding connection between the weft selection lifting plate 111 and the weft insertion bracket 4, the present invention provides a weft selection fixing plate 108. This weft selection fixing plate 108 is mounted on the front upright plate 401 of the weft insertion bracket 4 using multiple horizontal weft selection support columns 115. A space is formed between the weft selection fixing plate 108 and the weft insertion bracket 4 to accommodate the weft selection lifting plate 111. The present invention optimally provides four weft selection support columns 115, with two upper and two lower weft selection support columns 115 on each of the left and right sides of the weft selection fixing plate 108. The two ends of the weft selection support columns 115 are detachably connected to the weft selection fixing plate 108 and the front upright plate 401 respectively using bolts. The weft fixing plate 108 is fixed to the front upright plate 401. In this invention, the weft selection lifting plate 111 is disposed between the weft selection fixing plate 108 and the weft insertion bracket 4. Two weft selection linear guide rails are installed on the side of the weft selection fixing plate 108 near the front upright plate 401. The two weft selection linear guide rails are parallel and both are arranged in the vertical direction. Multiple weft selection sliders 109 are detachably installed on the side of the weft selection lifting plate 111 near the weft selection fixing plate 108 by bolts. The weft selection sliders 109 cooperate with the weft selection linear guide rails. The sliding of the weft selection sliders 109 on the weft selection linear guide rails causes the weft selection lifting plate 111 to slide vertically relative to the front upright plate 401. The weft selection lifting drive device 101 in this invention preferably employs a weft selection lifting drive motor. A weft selection lifting motor mounting plate 102 is detachably bolted to the bottom of the weft selection fixing plate 108. The weft selection lifting drive motor is detachably bolted to the weft selection lifting motor mounting plate 102, and the output axis of the weft selection lifting drive motor passes through the weft selection lifting motor mounting plate 102. A weft selection ball screw 106 is provided on the weft selection fixing plate 108 between two weft selection linear guide rails. A weft selection bearing seat 107 is rotatably connected to the weft selection fixing plate 108 at both the top and bottom ends of the weft selection ball screw 106. Next, a weft selection screw connecting plate 104 is installed on the weft selection lifting plate 111. A weft selection screw slider 105 is provided on the weft selection screw connecting plate 104. The weft selection ball screw 106 passes through the weft selection screw connecting plate 104 and the weft selection screw slider 105, and the weft selection ball screw 106 is threadedly engaged with the weft selection screw slider 105. The bottom end of the weft selection ball screw 106 is connected to the output shaft of the weft selection lifting drive motor by a weft selection coupling 103. The weft selection lifting drive motor drives the weft selection ball screw 106 to rotate. The threaded engagement between the weft selection ball screw 106 and the weft selection screw slider 105 drives the weft selection lifting plate 111 to slide up and down. In the optimal embodiment of the present invention, a weft selection protective plate 123 is detachably installed on the weft selection fixing plate 108 using screws. The weft selection protective plate 123 in the present invention is made by bending the left and right ends of a metal plate 90 degrees toward the weft selection lifting plate 111.

[0034] like Figure 4As shown, the yarn cutting mechanism 118 is located at one end of the weft selection mechanism 1 mounted on the weft insertion bracket 4, and moves synchronously with the vertical movement of the weft selection mechanism 1. It is used to cut the weft yarn from the weft selection mechanism 1 after the auxiliary yarn clamping mechanism 3 clamps the weft yarn. Figure 5 As shown, the yarn shearing mechanism 118 of the present invention includes a stationary blade 1181, a moving blade 1182, and a yarn shearing drive cylinder 1184. The bottom of the stationary blade 1181 is detachably bolted to the weft selection base plate 116 on the weft selection lifting plate 111. The middle part of the moving blade 1182 is rotatably mounted on the weft selection base plate 116 on the weft selection lifting plate 111 via a scissor shaft 1183. The cutting edges of the moving blade 1182 and the stationary blade 1181 face each other. The yarn shearing drive cylinder 1184 is mounted on the weft selection base plate 116 on the weft selection lifting plate 111. The piston rod of the yarn shearing drive cylinder 1184 is rotatably connected to the bottom end of the moving blade 1182. The extension and retraction of the piston rod of the yarn shearing drive cylinder 1184 is used to drive the moving blade 1182 to rotate relative to the weft selection lifting plate 111, and cooperate with the stationary blade 1181 to cut the weft yarn.

[0035] like Figure 6 and Figure 7 As shown, the rapier traction mechanism 2 is installed on the rear upright plate 402 of the weft insertion bracket 4. The rapier traction mechanism 2 includes a rapier 208, which can be made of square steel. The structure of the rapier 208 itself is also existing technology. The rapier 208 can move vertically and back and forth relative to the weft insertion bracket 4. The vertical movement of the rapier 208 is coordinated with the vertical movement of the weft selection and yarn feeding mechanism 119. That is, while the weft selection and yarn feeding mechanism 119 moves vertically, the rapier 208 moves vertically at the same time to pull the yarn of the three-dimensional woven prefabricated body of different layers. The back and forth movement of the rapier 208 is used to clamp and pull the weft yarn on the weft selection and yarn feeding mechanism 119.

[0036] like Figure 6 and Figure 7As shown, the rapier traction mechanism 2 of the present invention is provided with a rapier lifting plate 203 and a linear module 212. The rapier lifting plate 203 is installed on the rear upright plate 402 of the weft insertion bracket 4 and forms a vertical moving pair with the rear upright plate 402 of the weft insertion bracket 4. A rapier support member 210 is installed on the upper part of the rapier lifting plate 203. The rapier support member 210 is made of aluminum profile. A rapier fixing member 209 is detachably installed on one end of the rapier support member 210 near the rapier lifting plate 203 by multiple bolts. The rapier fixing member 209 is detachably installed on the rapier lifting plate 203 by bolts, so that the rapier support member 210 is fixed on the rapier lifting plate 203. The rapier 208 of the present invention is installed on the rapier support member 210 and can move along the front and rear directions on the rapier support member 210. In this invention, the linear module 212 is installed on the end of the spar support 210 away from the spar lifting plate 203, and the linear module 212 is connected to the spar 208. The linear module 212 is used to drive the spar 208 to move on the spar support 210.

[0037] like Figure 6 and Figure 7As shown, in order to facilitate the sliding installation of the rapier lifting plate 203 and the weft insertion bracket 4, the rapier traction mechanism 2 of the present invention is provided with a traction fixing plate 214. The traction fixing plate 214 is installed on the weft insertion bracket 4 by multiple horizontal traction support columns 204. The present invention preferably uses four traction support columns 204 to connect the traction fixing plate 214 and the rear upright plate 402 of the weft insertion bracket 4. Two traction support columns 204 are provided on each of the left and right sides of the traction fixing plate 214. The front and rear ends of the traction support columns 204 are detachably connected to the traction fixing plate 214 and the rear upright plate 402 by bolts, so as to fix the traction fixing plate 214 on the rear upright plate 402 of the weft insertion bracket 4, and a space for accommodating the rapier lifting plate 203 is formed between the traction fixing plate 214 and the rear upright plate 402 of the weft insertion bracket 4. In this invention, the rapier lifting plate 203 is located between the traction fixing plate 214 and the weft insertion bracket 4. Two rapier linear guide rails are detachably installed on the side of the traction fixing plate 214 near the rapier lifting plate 203 using bolts. Both rapier linear guide rails are arranged vertically. A rapier slider 218 is detachably installed on the rapier lifting plate 203 near the traction fixing plate 214 using bolts. The rapier slider 218 cooperates with the rapier linear guide rails. The sliding of the rapier slider 218 on the rapier linear guide rails causes the rapier lifting plate 203 to slide vertically on the traction fixing plate 214, thereby realizing the vertical sliding of the rapier lifting plate 203 relative to the weft insertion bracket 4. In this invention, a rapier lifting motor mounting plate 202 is detachably bolted to the bottom of the traction fixing plate 214. A rapier lifting drive device is detachably bolted to the rapier lifting motor mounting plate 202 to drive the rapier lifting plate 203 to move up and down. Preferably, the rapier lifting drive device is a rapier lifting motor 201, wherein the output shaft of the rapier lifting motor 201 is vertically upward and passes through the rapier lifting motor mounting plate 202. Two upper and lower rapier screw bearing seats 217 are detachably bolted to the traction fixing plate 214, and a rapier ball screw 219 is rotatably mounted on the two rapier screw bearing seats 217. The bottom end of the ball screw 219 is connected to the output shaft of the rapier lifting motor 201 via a rapier coupling 213. A rapier screw connecting plate 215 is fixed on the rapier lifting plate 203, and a rapier screw slider 216 is installed on the rapier screw connecting plate 215. The rapier ball screw 219 passes through the rapier screw connecting plate 215 and the rapier screw slider 216 vertically, and the rapier ball screw 219 and the rapier screw slider 216 are threaded together. The rapier lifting motor 201 drives the rapier ball screw 219 to rotate, and the rapier ball screw 219 drives the rapier screw connecting plate 215 and the rapier screw slider 216 to move up and down, thereby causing the rapier lifting plate 203 to slide vertically.Preferably, the present invention has a traction protection plate 220 detachably installed on the traction fixing plate 214 by screws. The traction protection plate 220 is made by bending a steel plate at 90 degrees from both ends toward the rapier lifting plate 203.

[0038] like Figure 6 and Figure 7 As shown, the present invention has a roller support bracket 207 installed on the top of the rapier lifting plate 203. In the optimal embodiment, a roller fixing plate 206 is detachably bolted to the side of the top of the rapier lifting plate 203 away from the linear module 212. The roller support bracket 207 is then detachably bolted to the roller fixing plate 206. Four rollers 205 are rotatably mounted on the roller support bracket 207. The four rollers 205 support the rapier 208 from the top, bottom, left, and right. When the rapier 208 is moving, the four rollers 205 rotate relative to the rapier 208. The four rollers 205 guide the rapier 208 while reducing the resistance to the movement of the rapier 208. The rapier traction mechanism 2 of the present invention is provided with a rapier fixing seat 211, which is slidably mounted on the rapier support member 210. For example, the bottom of the rapier fixing seat 211 is provided with a guide groove with the same cross-sectional shape as the rapier support member 210, so that the rapier fixing seat 211 slides on the rapier support member 210. The rapier fixing seat 211 is driven by the linear module 212 to move back and forth on the rapier support member 210. The end of the rapier 208 away from the weft selection mechanism 1 is fixed on the rapier fixing seat 211. The movement of the rapier fixing seat 211 on the rapier support member 210 pushes the rapier 208 to move back and forth. The structures of the linear module 212, the rapier fixing seat 211, and the sliding structure on the rapier support member 210 driven by the linear module 212 are all prior art. For details, please refer to the Chinese invention patent application with publication number CN112522838A filed by the applicant on November 26, 2020. Other parts of this invention that are not described in detail can also be referred to the above patent application, and will not be described in detail here.

[0039] like Figure 1 As shown, there are two auxiliary yarn clamping mechanisms 3 in this invention, which are respectively installed on the front plate 401 and the rear plate 402 of the weft insertion bracket 4, and can move vertically relative to the weft insertion bracket 4. The auxiliary yarn clamping mechanism 3 is used to clamp the weft yarn from the weft selection mechanism 1 and the rapier traction mechanism 2 after the rapier traction mechanism 2 pulls the yarn.

[0040] like Figure 8As shown, the auxiliary yarn clamping mechanism 3 of this invention includes a mounting plate 301, an up-and-down driving cylinder 306, a left-and-right driving cylinder 303, a gripper A 304, and a gripper B 305. The mounting plate 301 is L-shaped, and its bottom is detachably mounted to the weft insertion bracket 4 with bolts. The cylinder body of the up-and-down driving cylinder 306 is detachably mounted to the mounting plate 301 with bolts through a cylinder fixing seat 302. The cylinder body of the left-and-right driving cylinder 303 is mounted on the piston rod of the up-and-down driving cylinder 306, and the extension and retraction of the piston rod of the up-and-down driving cylinder 306 is used to drive the left-and-right driving cylinder 303. The gripper A304 is detachably bolted to the cylinder body of the left and right drive cylinders 303, and the piston rod of the left and right drive cylinders 303 passes through the gripper A304. The gripper B305 is mounted on the piston rod of the left and right drive cylinders 303. The piston rod of the left and right drive cylinders 303 extends and retracts to drive the gripper B305 to move toward or away from the gripper A304, for clamping or releasing the weft yarn located between the gripper B305 and the gripper A304. In this invention, anti-slip textures are provided on the opposite side of the gripper A304 and the gripper B305 to facilitate clamping the weft yarn.

[0041] When using this invention: 1. During initial operation, the weft yarn is manually passed through the weft selection and feeding mechanism 119 of the weft selection lifting mechanism 1 and pulled between the two clamps of the rapier 207. Wait for the rapier 207 to clamp the weft yarn. The left and right drive motors 110, rack 113, and gear 114 drive the weft selection and feeding mechanism 119 to perform left and right weft selection, choosing the desired yarn. After turning on the air source of the weft selection and feeding mechanism 119, the airflow of the weft selection and feeding mechanism 119 pushes the weft yarn between the two clamps of the rapier 207. At the clamp, the clamp of the rapier 207 of the rapier traction mechanism 2 pulls the weft yarn to the other end through the linear module 209; after the clamp of the rapier 207 of the rapier traction mechanism 2 pulls the weft yarn to the other end, the auxiliary yarn clamping mechanisms 3 on both sides of the rapier 207 move upward through the pneumatically controlled up and down drive cylinders 306, and the left and right drive cylinders 303 control the clamps A304 and B305 to close and clamp the weft yarn. At this time, the clamp of the rapier 207 of the rapier traction mechanism 2 is released. In this invention, after the auxiliary yarn clamping mechanism 3 clamps the weft yarn, it is driven downward by the upper and lower drive cylinders 306. When the auxiliary yarn clamping mechanism 3 clamps the weft yarn and moves to the lower limit, the rapier 207 of the rapier traction mechanism 2 continues to clamp the next bundle of weft yarn. At the same time, the yarn cutting mechanism 118 of the weft selection lifting mechanism 1 cuts the yarn. After cutting the yarn, the grippers A304 and B305 of the auxiliary yarn clamping mechanism 3 are released, and it continues to wait for the next yarn clamping.

[0042] Unless otherwise specified in the above description, all parts are prior art, or can be implemented using existing technology. Furthermore, the specific embodiments described in this invention are merely preferred embodiments and are not intended to limit the scope of this invention. That is, all equivalent changes and modifications made within the scope of this invention should be considered within the technical scope of this invention.

Claims

1. A three-dimensional woven prefabricated weft insertion mechanism, characterized in that: include (4) The weft selection mechanism (1) is installed at one end of the weft insertion bracket (4), and includes a weft selection and yarn feeding mechanism (119). The weft selection and yarn feeding mechanism (119) can move vertically and left and right relative to the weft insertion bracket (4). The vertical movement of the weft selection and yarn feeding mechanism (119) is used to feed yarn to the three-dimensional woven prefabricated body of different layers. The left and right movement of the weft selection and yarn feeding mechanism (119) is used for left and right weft selection. Rapier traction mechanism (2), which is installed at the other end of the weft insertion bracket (4), includes a rapier (208), which can move vertically and back and forth relative to the weft insertion bracket (4). The vertical movement of the rapier (208) cooperates with the vertical movement of the weft selection and yarn feeding mechanism (119) to pull yarn on the three-dimensional woven prefabricated body of different layers. The back and forth movement of the rapier (208) is used to clamp and pull the weft yarn on the weft selection and yarn feeding mechanism (119). Auxiliary yarn clamping mechanism (3), there are two auxiliary yarn clamping mechanisms (3), which are installed at the left and right ends of the weft insertion bracket (4) respectively, and can move vertically relative to the weft insertion bracket (4). The auxiliary yarn clamping mechanism (3) is used to clamp the weft yarn from the weft selection mechanism (1) and the rapier traction mechanism (2) after the rapier traction mechanism (2) pulls the yarn. After clamping the weft yarn, the auxiliary yarn clamping mechanism (3) moves downward. When the auxiliary yarn clamping mechanism (3) clamps the weft yarn and moves to the lower limit, the rapier traction mechanism (2) continues to clamp the next bundle of weft yarn. The yarn cutting mechanism (118) is located at one end of the weft selection mechanism (1) mounted on the weft insertion bracket (4) and moves synchronously with the vertical movement of the weft selection mechanism (1). It is used to cut the weft yarn from the weft selection mechanism (1) after the auxiliary yarn clamping mechanism (3) clamps the weft yarn.

2. The three-dimensional woven prefabricated weft insertion mechanism according to claim 1, characterized in that: The latitude selection mechanism (1) also includes The weft selection lifting plate (111) is installed on the weft insertion bracket (4) and forms a vertical moving pair with the weft insertion bracket (4). The weft selection and yarn feeding mechanism (119) is installed on the weft selection lifting plate (111) and can slide on the weft selection lifting plate (111) in the left and right directions. Weft selection lifting drive device (101), which is connected to weft selection lifting plate (111) for driving the weft selection lifting plate (111) to move vertically on the weft insertion bracket (4); A left and right drive motor (110) is mounted on the weft selection lifting plate (111) to drive the weft selection and yarn feeding mechanism (119) to move left and right on the weft selection lifting plate (111).

3. The three-dimensional woven prefabricated weft insertion mechanism according to claim 2, characterized in that: The weft selection mechanism (1) also includes a weft selection and yarn feeding mounting base, which includes... Two weft selection side plates (122) are installed on the left and right sides of the weft selection lifting plate (111) respectively, and move synchronously with the vertical movement of the weft selection side plates (122); The weft selection base plate (116) is connected to two weft selection side plates (122) at both ends and moves synchronously with the movement of the weft selection side plates (122). The weft selection and yarn feeding mechanism (119) is slidably installed on the weft selection base plate (116), and the yarn cutting mechanism (118) is installed on the weft selection base plate (116). Motor mounting plate (112) is located below the weft selection base plate (116), and both ends of the motor mounting plate (112) are connected to two weft selection side plates (122) respectively. The left and right drive motors (110) are mounted on the motor mounting plate (112). Multiple guide rods (121) are connected to two weft selection side plates (122) at both ends. The weft yarn passes around the guide rods (121) and through the weft selection yarn feeding mechanism (119), and is fed by the weft selection yarn feeding mechanism (119).

4. The three-dimensional woven prefabricated weft insertion mechanism according to claim 2 or 3, characterized in that: Also includes The weft selection fixing plate (108) is installed on the weft insertion bracket (4) by multiple horizontal weft selection support columns (115), and a space is formed between the weft selection fixing plate (108) and the weft insertion bracket (4) to accommodate the weft selection lifting plate (111). The weft selection lifting plate (111) is located between the weft selection fixing plate (108) and the weft insertion bracket (4), and is slidably installed on the weft selection fixing plate (108) by means of guide rail and slider.

5. The three-dimensional woven prefabricated weft insertion mechanism according to claim 2 or 3, characterized in that: The yarn shearing mechanism (118) includes A stationary blade (1181) is mounted on a weft selection lifting plate (111); The moving blade (1182) is rotatably mounted on the weft selection lifting plate (111) by means of a scissor shaft (1183); A yarn-cutting drive cylinder (1184) is mounted on a weft-selection lifting plate (111). The piston rod of the yarn-cutting drive cylinder (1184) is rotatably connected to one end of the moving blade (1182). The extension and retraction of the piston rod of the yarn-cutting drive cylinder (1184) is used to drive the moving blade (1182) to rotate relative to the weft-selection lifting plate (111) and cooperate with the stationary blade (1181) to cut the weft yarn.

6. The three-dimensional woven prefabricated weft insertion mechanism according to claim 1, characterized in that: The rapier traction mechanism (2) also includes Rapier lifting plate (203), which is installed on weft insertion bracket (4) and forms a vertical moving pair with weft insertion bracket (4), a rapier support (210) is installed on the upper part of the rapier lifting plate (203), the rapier (208) is installed on the rapier support (210) and can move along the front and back direction on the rapier support (210); A linear module (212) is mounted on the rapier support (210) and connected to the rapier (208) for driving the rapier (208) to move on the rapier support (210).

7. The three-dimensional woven prefabricated weft insertion mechanism according to claim 6, characterized in that: The rapier traction mechanism (2) also includes The traction fixing plate (214) is installed on the weft insertion bracket (4) by multiple horizontal traction support columns (204), forming a space between the traction fixing plate (214) and the weft insertion bracket (4) to accommodate the rapier lifting plate (203). The rapier lifting plate (203) is located between the traction fixing plate (214) and the weft insertion bracket (4), and is slidably installed on the traction fixing plate (214) by means of guide rail and slider cooperation.

8. The three-dimensional woven prefabricated weft insertion mechanism according to claim 6 or 7, characterized in that: A support roller bracket (207) is installed on the top of the rapier lifting plate (203). Four support rollers (205) are rotatably installed on the support roller bracket (207). The four support rollers (205) support the rapier (208) from the top, bottom, left and right respectively. When the rapier (208) is moving, the four support rollers (205) rotate relative to the rapier (208).

9. The three-dimensional woven prefabricated weft insertion mechanism according to claim 8, characterized in that: The rapier traction mechanism (2) also includes a rapier fixing seat (211), which is slidably mounted on the rapier support (210) and driven by the linear module (212) to move back and forth on the rapier support (210). The end of the rapier (208) away from the weft shifting mechanism (1) is fixed on the rapier fixing seat (211), and the rapier fixing seat (211) moves on the rapier support (210) to push the rapier (208) to move back and forth.

10. The three-dimensional woven prefabricated weft insertion mechanism according to claim 1, characterized in that: The auxiliary yarn clamping mechanism (3) includes Mounting plate (301), which is mounted on weft insertion bracket (4); Up and down drive cylinder (306), the cylinder body of which is mounted on mounting plate (301); A left and right drive cylinder (303) has its cylinder body mounted on the piston rod of an up and down drive cylinder (306), and the piston rod of the up and down drive cylinder (306) extends and retracts to drive the left and right drive cylinder (303) to move up and down. Gripper A (304) is mounted on the cylinder body of the left and right drive cylinders (303), and the piston rod of the left and right drive cylinders (303) passes through gripper A (304). Gripper B (305) is mounted on the piston rod of the left and right drive cylinders (303). The piston rod of the left and right drive cylinders (303) extends and retracts to drive gripper B (305) to move toward or away from gripper A (304) to clamp or release the weft yarn located between gripper B (305) and gripper A (304).

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