Weft insertion and selection device of air jet loom

Abstract

The invention discloses a weft insertion and selection device of an air-jet loom in the technical field of air-jet looms, which comprises a mounting frame, a weft insertion mechanism and a weft selection mechanism, the spraying pipe is horizontally arranged on the mounting frame, a plurality of conical barrels are coaxially communicated with the interior of the spraying pipe, a plurality of gas ring shells are arranged on the outer wall of the spraying pipe in an array mode, and the gas ring shells correspond to the conical barrels one to one; a plurality of annularly-distributed air pipes are communicated between the air ring shell and the conical barrel and correspond to the spiral grooves in a one-to-one mode. The air supply mechanism comprises an air pump arranged on the mounting frame, and the air outlet end of the air pump is connected with a plurality of first conveying pipes communicating with the multiple air ring shells one to one through a branch through head. Multi-stage pushing is formed through the design of a conical barrel, high-pressure air is guided through a spiral groove, spiral wind power is generated, yarn is centered and positioned, and the yarn quality is improved. And in cooperation with axial high-pressure wind power, the efficiency and accuracy of weft insertion guiding of the yarn can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of air jet looms, in particular to a weft insertion and selection device of an air jet loom. Background Art

[0002] The air jet loom is a shuttleless loom that uses jet airflow to pull the weft yarn through the shed. The working principle is to use air as the weft insertion medium, and use the jetted compressed airflow to generate friction traction on the weft yarn to pull the weft yarn through the shed, and achieve the purpose of weft insertion through the jet generated by the air jet; After searching the invention with patent publication number CN213113709U, it is found that a multi-color weft insertion device for a jet loom is disclosed, which merges the yarns through a paralleling device to increase the yarn strength, and increases the power of the air inside the entire device by reducing the length of the entire device, preventing the yarn from being unable to go out due to small force at the end, thereby causing blockage. However, there are certain problems in its use. First, it is blown into the chute from the outlet bin by a blower, and a filter plate is arranged in the outlet bin. Although the filter plate can filter impurities in the air, it will also increase wind resistance and reduce the air pressure of the airflow, so that the wind pressure at the front end is small. At the same time, its chute is only a single straight cylinder. Although its length is shortened, its wind pressure driving force on the yarn is small, the yarn's neutralization is poor, and the centering stability when the yarn is inserted is insufficient, thereby reducing the efficiency of the subsequent weft insertion of the yarn. Therefore, the present application proposes a weft insertion and selection device for a jet loom. Summary of the invention

[0003] The purpose of the present invention is to solve the problems that the existing weft insertion device has a small wind pressure driving force on the yarn, poor yarn centering performance, insufficient centering stability when the yarn is inserted, thereby reducing the efficiency of subsequent yarn insertion. The present invention provides a weft insertion and selection device for an air jet loom.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: The weft insertion and selection device of the air jet loom comprises: A mounting frame, one end of which is provided with a placing frame for placing the yarn bobbin; A nozzle is horizontally arranged on a mounting frame, wherein a plurality of conical cylinders are coaxially connected in the nozzle, a plurality of spiral grooves distributed in an annular pattern are opened on the inner wall of the conical cylinder, a plurality of gas ring shells are arranged in an array on the outer wall of the nozzle, the plurality of gas ring shells correspond to the plurality of conical cylinders one by one, a plurality of gas pipes distributed in an annular pattern are connected between the gas ring shell and the conical cylinder, and the plurality of gas pipes correspond to the plurality of spiral grooves one by one; The air supply mechanism comprises an air pump arranged on a mounting frame, wherein the air outlet end of the air pump is connected with a plurality of first delivery pipes through a branching head, and the plurality of first delivery pipes are respectively connected with a plurality of air ring casings one by one.

[0005] Furthermore, a fixed-length weft storage device is provided on the placing rack, and a guide ring is connected to the placing rack via a support rod.

[0006] Furthermore, the nozzle is rotatably connected to the mounting frame, the air ring shell includes an annular air shell arranged on the nozzle, the outer peripheral side of the annular air shell has an annular opening and an annular sealing plate is rotatably arranged in the annular opening, the air pipe is connected to the annular air shell, the first delivery pipe is connected to the annular sealing plate, a motor is arranged on the mounting frame, and a first pulley assembly is connected between the output shaft of the motor and the nozzle.

[0007] Furthermore, the inner wall of the annular air shell is configured with a guiding slope, and a plurality of air pipes are arranged at an inclination.

[0008] Furthermore, a rotating sealing ring is provided between the annular sealing plate and the annular gas casing.

[0009] Furthermore, an auxiliary suction nozzle coaxial with the nozzle is provided at one end of the mounting frame away from the nozzle through a support plate, and a second delivery pipe is connected between the auxiliary suction nozzle and the air suction end of the air pump.

[0010] Furthermore, the second delivery pipe is connected to a filter box disposed on a mounting frame, and a filter screen is disposed in the filter box.

[0011] Furthermore, a shaft is rotatably inserted through the filter box, the filter screen is enclosed in a cylindrical shape and is coaxially arranged on the shaft through a connecting rod, the inner wall of the filter box is provided with baffles with two ends overlapping the filter screen, and the mounting frame is provided with a driving member for driving the shaft to rotate.

[0012] Furthermore, the driving member includes a first guide rod and a second guide rod rotatably arranged on the mounting frame, one end of the first guide rod is connected to the motor, the first guide rod and the second guide rod are transmission-connected via a bevel gear assembly, and a second pulley assembly is connected between the second guide rod and the shaft rod.

[0013] Furthermore, a ring plate is provided at one end of the nozzle close to the placement rack, and a guide tube is provided inside the nozzle and between two adjacent conical tubes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, high-pressure gas is delivered to a plurality of air ring shells through a plurality of first delivery pipes by an air pump, and the high-pressure gas in the air ring shells is then circumferentially circulated into the conical cylinder through a plurality of air pipes. Due to the conical structure, the diameter is gradually reduced, so that the wind speed is increased, and the yarn can be effectively pushed by wind pressure. The design of the plurality of conical cylinders forms a multi-stage push to ensure that the weft yarn has sufficient travel force. The high-pressure gas is guided by a spiral groove to generate a spiral wind force, thereby centering the yarn. At the same time, the axial high-pressure wind force is combined to effectively improve the efficiency and accuracy of weft guiding of the yarn.

[0015] 2. In the present invention, an auxiliary suction nozzle is arranged on the mounting frame, and a second delivery pipe is connected between the auxiliary suction nozzle and the suction end of the air pump. When the air pump supplies high-pressure gas to the nozzle, the second delivery pipe is used to meet the air intake of the air pump, so that the auxiliary suction nozzle generates suction. The suction force generated by the auxiliary suction nozzle is used to assist in attracting the ejected yarn, thereby reducing the diffusion of the airflow, further improving the penetration force of the yarn, and improving the efficiency of yarn weft insertion.

[0016] 3. In the present invention, the filter box is connected to the second conveying pipe, and a shaft is rotatably set in the filter box. The filter screen is enclosed in a cylindrical shape and set on the shaft. The motor drives the shaft to rotate, thereby driving the filter screen to rotate. When it rotates, two baffles scrape and brush its outer surface, so that the filter screen can not only filter the airflow and intercept impurities, but also, due to the scraping of the baffles, the surface of the filter screen always has a ventilation area, and will not be blocked due to long-term use, thereby ensuring the normal passage of airflow and the stable supply of airflow, thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the present invention; Figure 2 It is a partial three-dimensional structural diagram of the present invention; Figure 3 It is a sectional view of a part of the three-dimensional structure of the present invention; Figure 4 This is another part of the three-dimensional structural diagram of the present invention; Figure 5 A sectional view of another part of the three-dimensional structure of the present invention; Figure 6 It is another three-dimensional structural diagram of the present invention; Figure 7 It is a sectional view of another part of the three-dimensional structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle.

[0018] In the figure: 1, mounting frame; 2, placing frame; 3, nozzle; 4, conical cylinder; 5, spiral groove; 6, air ring shell; 7, air pipe; 8, air supply mechanism; 9, fixed length weft storage device; 10, guide ring; 11, motor; 12, first pulley assembly; 13, guiding slope; 14, rotating sealing ring; 15, support plate; 16, auxiliary suction nozzle; 17, second conveying pipe; 18, filter box; 19, filter screen; 20, shaft rod; 21, baffle; 22, driving member; 23, ring plate; 24, guide cylinder; 601, annular air shell; 602, annular sealing plate; 801, air pump; 802, branch head; 803, first conveying pipe; 2201, first guide rod; 2202, second guide rod; 2203, bevel gear assembly; 2204, second pulley assembly. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] The weft insertion and selection device of the air jet loom provided in this embodiment is mainly used to solve the problem that the existing weft insertion device has a small wind pressure driving force on the yarn, poor yarn centering, insufficient centering stability when the yarn is inserted, thereby reducing the efficiency of subsequent yarn insertion, and provides the following technical solutions. Figure 1-Figure 8 Make a detailed description: The weft insertion and selection device of the air jet loom comprises: A mounting frame 1, one end of which is provided with a placing frame 2 for placing a yarn bobbin, the mounting frame 1 is used to be installed on the air jet loom, the placing frame 2 includes a vertical plate arranged on the mounting frame 1, one side of the vertical plate is connected to a horizontal plate, a vertical column is arranged on the horizontal plate, and the yarn bobbin is movably sleeved on the vertical column; The nozzle 3 is horizontally arranged on the mounting frame 1. The mounting frame 1 is constructed with two vertical plates. The nozzle 3 is arranged on the two vertical plates. A plurality of conical tubes 4 are coaxially connected in the nozzle 3. The end of the conical tube 4 with a large opening is connected to the nozzle 3, and the end with a small opening is away from the placing frame 2. The inner wall of the conical tube 4 is provided with a plurality of spiral grooves 5 distributed in an annular manner. The outer wall array of the nozzle 3 is provided with a plurality of air ring shells 6. The plurality of air ring shells 6 correspond to the plurality of conical tubes 4 one by one. The air ring shells 6 and the conical tubes 4 are connected with a plurality of air pipes 7 distributed in an annular manner, and the plurality of air pipes 7 correspond to the plurality of spiral grooves 5 one by one. When the yarn is inserted into the weft, the yarn tube is placed on the placing frame 2, and the ends of the yarn are moved through the plurality of conical tubes 4 in sequence to distribute the high-pressure airflow to the plurality of air ring shells 6. The high-pressure gas in the air ring shells 6 is then discharged through the plurality of air pipes 7. The annular diversion is transferred to the conical cylinder 4. When the high-pressure gas flows along the conical cylinder 4, due to the conical structure, its diameter gradually decreases, so that the wind speed increases, and the yarn can be effectively pushed by wind pressure. The design of several conical cylinders 4 forms a multi-stage push when the yarn is pushed to move by wind pressure, thereby improving the pushing effect of wind pressure on the yarn, ensuring that the weft yarn has sufficient running force, and ensuring that the yarn can move smoothly and quickly. By providing a spiral groove 5 on the inner wall of the conical cylinder 4, and the air pipe 7 is connected to the spiral groove 5, when the air flow flows from the air pipe 7 into the conical cylinder 4, it is guided by the spiral groove 5, and the air flow flows in a spiral manner. The spiral circulation of the air flow not only further improves the pushing and ejecting effect of the yarn, but also uses the spiral wind force generated by the spiral flow to center the yarn. At the same time, combined with the axial high-pressure wind force, it can effectively improve the efficiency and accuracy of weft guidance of the yarn. The air supply mechanism 8 includes an air pump 801 disposed on the mounting frame 1. The air outlet end of the air pump 801 is connected to a plurality of first delivery pipes 803 through a branching head 802. The plurality of first delivery pipes 803 are respectively connected to a plurality of air ring shells 6 one by one. When supplying air, the air pump 801 works, draws in external air and circulates it through the branching head 802 to the plurality of first delivery pipes 803, and then divides it into the plurality of air ring shells 6, thereby completing the air supply work; In this solution, the air pump 801 delivers high-pressure gas to several air ring shells 6 through several first delivery pipes 803. The high-pressure gas in the air ring shells 6 then flows in a ring shape through several air pipes 7 to the conical tube 4. Due to the conical structure, the diameter gradually decreases, so that the wind speed increases, and the yarn can be effectively pushed by wind pressure. The design of several conical tubes 4 forms a multi-stage push, thereby improving the pushing effect of wind pressure on the yarn, ensuring that the weft yarn has sufficient travel force, and ensuring that the yarn can move smoothly and quickly. The spiral groove 5 is used to guide the high-pressure gas, and the spiral wind force generated by the spiral flow is used to center the yarn. At the same time, combined with the axial high-pressure wind force, the efficiency and accuracy of the weft guiding of the yarn can be effectively improved.

[0021] like Figure 1 As shown, in this embodiment, a fixed-length weft accumulator 9 is provided on the placing rack 2, and a guide ring 10 is connected to the placing rack 2 through a support rod. The fixed-length weft accumulator 9 can quickly wind the yarn into its own electronic controller, and can be released at an extremely fast speed when needed, and can be retracted at an extremely fast speed when needed, and provide appropriate tension to ensure that the weft yarn can be evenly supplied, so as to increase the weaving speed and reduce the breakage rate. Through the fixed-length weft accumulator 9 and the guide ring 10, when the yarn is released, the end of the yarn is first wound around the fixed-length weft accumulator 9, and then moved through the guide ring 10. The guide ring 10 performs preliminary centering and positioning on the yarn, and finally the yarn is passed through the nozzle 3, which can not only improve the smoothness of the yarn release, but also increase the weaving speed and reduce the breakage rate, thereby improving practicality.

[0022] like Figure 1 and Figure 2As shown, in this embodiment, the nozzle 3 is rotatably connected to the mounting frame 1, and the nozzle 3 is rotatably connected to the two vertical plates. The air ring shell 6 includes an annular air shell 601 arranged on the nozzle 3, and the outer peripheral side of the annular air shell 601 has an annular opening and an annular sealing plate 602 is rotatably arranged in the annular opening. The air pipe 7 is connected to the annular air shell 601, and the first conveying pipe 803 is connected to the annular sealing plate 602. A motor 11 is arranged on the mounting frame 1, and a first pulley assembly 12 is connected between the output shaft of the motor 11 and the nozzle 3. Preferably, in order to make the device more reasonable, the first conveying pipe 803 adopts a hard pipe (iron pipe), which can not only convey the airflow to the air ring shell 6, but also support the annular sealing plate 602. If The plurality of air pipes 7 are distributed in a circular array, and the first conveying pipe 803 is connected to the air ring shell 6 at a fixed position. The air ring shell 6 is composed of an annular air shell 601 and an annular sealing plate 602, and the two are rotatably connected. The motor 11 performs work, and its output shaft drives the nozzle 3 to rotate through the first pulley assembly 12, thereby driving the plurality of annular air shells 601 to rotate synchronously. When the annular air shell 601 rotates, the high-pressure gas conveyed to the annular air shell 601 by the first conveying pipe 803 can flow more evenly and smoothly through the plurality of air pipes 7 to the conical cylinder 4, so that the plurality of airflows can be uniformly conveyed in an annular direction, so that the airflow conveyed in the conical cylinder 4 is stable, the pushing effect on the yarn is improved, and the sufficient penetration force of the yarn is ensured, thereby improving practicality.

[0023] like Figure 5 As shown, in this embodiment, the inner wall of the annular gas shell 601 is configured with a guiding slope 13, and a plurality of gas pipes 7 are arranged at an angle. Figure 5 As shown, by constructing a guiding slope 13 in the annular air shell 601 and tilting the air pipe 7, the inclined guiding of the guiding slope 13 and the air pipe 7 is utilized to enable the high-pressure airflow in the annular air shell 601 to flow more smoothly into the conical cylinder 4, thereby reducing the resistance of the airflow flowing from the annular air shell 601 to the air pipe 7 and improving the effect of pushing and ejecting the yarn.

[0024] like Figure 5 As shown, in this embodiment, a rotating sealing ring 14 is arranged between the annular sealing plate 602 and the annular gas shell 601. The rotating sealing ring 14 is also called a rotating shaft lip sealing ring, which can ensure the sealing of the annular sealing plate 602 and the annular gas shell 601 and ensure that under the action of air pressure, the air flow can flow through the air pipe 7 to the conical cylinder 4. At the same time, it can ensure the rotation smoothness between the annular sealing plate 602 and the annular gas shell 601, thereby improving practicality.

[0025] like Figure 1As shown, in this embodiment, the end of the mounting frame 1 away from the nozzle 3 is provided with an auxiliary suction nozzle 16 coaxial with the nozzle 3 through a support plate 15, and a second conveying pipe 17 is connected between the auxiliary suction nozzle 16 and the suction end of the air pump 801. Preferably, when the mounting frame 1 is installed on the air jet loom, the nozzle 3 and the auxiliary suction nozzle 16 are respectively located at the two ends of the air jet loom, and the warp yarn and the weft yarn are located therebetween. Through the auxiliary suction nozzle 16, and the auxiliary suction nozzle 16 and the suction end of the air pump 801 are connected. Through the second delivery pipe 17, when the air pump 801 supplies high-pressure gas to the nozzle 3, the second delivery pipe 17 is used to meet the air intake of the air pump 801, so that the auxiliary suction nozzle 16 generates suction. When the yarn is ejected from the nozzle 3, the suction force generated by the auxiliary suction nozzle 16 is used to assist in attracting the ejected yarn. At the same time, the auxiliary suction nozzle 16 can also absorb the airflow ejected from the nozzle 3 to reduce the diffusion of the airflow, further improve the penetration force of the yarn, and improve the efficiency of yarn weft insertion, thereby improving practicality.

[0026] like Figure 6 and Figure 8 As shown, in this embodiment, the second conveying pipe 17 is connected to a filter box 18 arranged on the mounting frame 1, and a filter screen 19 is arranged in the filter box 18. When the yarn is inserted into the weft for weaving, the introduced yarn needs to be cut to cooperate with the warp for weaving. Debris (fiber fluff) will be generated in the process of cutting the thread. At the same time, dust and impurities will exist in the air. By connecting the filter box 18 to the second conveying pipe 17 and arranging the filter screen 19 in the filter box 18, when the airflow is transported from the second conveying pipe 17 to the air pump 801, the filter screen 19 filters the airflow to trap impurities such as dust and fluff in the filter box 18, which can not only prevent impurities such as dust and fluff from entering the air pump 801 to protect the air pump 801, but also prevent impurities from adhering to the sprayed weft yarn during use, thereby ensuring the aesthetics of the fabric and improving practicality.

[0027] like Figure 6 and Figure 8As shown, in this embodiment, a shaft 20 is rotatably penetrated in the filter box 18, and the filter screen 19 is enclosed in a cylindrical shape and is coaxially arranged on the shaft 20 through a connecting rod. The inner wall of the filter box 18 is provided with baffles 21 with two ends overlapping the filter screen 19, and the mounting frame 1 is provided with a driving member 22 for driving the shaft 20 to rotate. Preferably, the second conveying pipe 17 is divided into two sections and is respectively connected to the left and right sides of the filter box 18, and the two baffles 21 are respectively arranged on the left and right inner walls of the filter box 18, and the two baffles 21 are arranged in an upper and lower staggered manner. When the filter screen 19 filters and intercepts impurities in the airflow, impurities such as dust and lint will also adhere to the surface of the filter screen 19 under the action of wind. The filter screen 19 is cylindrical and coaxially arranged on the shaft 20, and the shaft 20 is driven to rotate by the driving member 22, thereby driving the filter screen 19 to rotate. When it rotates, the two baffles 21 scrape and brush the outer surface, so that the filter screen 19 can not only filter the airflow and intercept impurities, but also, due to the scraping of the baffle 21, the surface of the filter screen 19 always has a ventilation area (the lateral flow area between the second conveying pipes 17 at both ends), which will not be blocked due to long-term use, thereby ensuring the normal passage of the airflow and the stable supply of the airflow, thereby improving the practicality.

[0028] like Figure 6 and Figure 7 As shown, in this embodiment, the driving member 22 includes a first guide rod 2201 and a second guide rod 2202 rotatably arranged on the mounting frame 1, one end of the first guide rod 2201 is connected to the motor 11, and the first guide rod 2201 and the second guide rod 2202 are connected to each other through a bevel gear assembly 2203, the bevel gear assembly 2203 includes two bevel gears, and the two bevel gears are respectively fixed on the first guide rod 2201 and the second guide rod 2202 and the teeth of the two are meshed, and a second pulley assembly 2204 is connected between the second guide rod 2202 and the shaft rod 20, when the motor 11 does work to drive the nozzle 3 to rotate, it will also drive the first guide rod 2201 to rotate synchronously, and the linkage of the bevel gear assembly 2203 is utilized to drive the second guide rod 2202 to rotate, and the linkage of the second pulley assembly 2204 is utilized to achieve the effect of driving the shaft rod 20 to rotate, so that the rotation of the drive shaft rod 20 and the rotation of the nozzle 3 share the same motor 11 as the driving force, thereby improving practicality.

[0029] like Figure 3As shown, in this embodiment, a ring plate 23 is provided at one end of the nozzle 3 close to the placement rack 2, and a guide tube 24 is provided inside the nozzle 3 and between two adjacent conical tubes 4. Preferably, the guide tube 24 is constructed in a conical shape, and its end with a small opening is connected to the end of the conical tube 4 with a small opening, and its end with a large opening is connected to the end of the adjacent conical tube 4 with a large opening. The ring plate 23 and the guide tube 24 can not only ensure that the yarn can pass smoothly, but also keep the airflow flowing smoothly from the left side to the right side, reduce the airflow from the left side, and avoid the airflow from causing turbulence between the two adjacent conical tubes 4, thereby improving practicality.

[0030] The working process of the present invention is as follows: the yarn bobbin is placed on the placing rack 2, the end portion of the yarn is wound on the fixed-length weft storage device 9, and then the yarn is moved through the guide ring 10, the guide ring 10 performs preliminary centering and positioning of the yarn, and finally the yarn is passed through the nozzle 3, the air pump 801 delivers the high-pressure gas to the several air ring shells 6 through the several first delivery pipes 803, and the high-pressure gas in the air ring shells 6 is then circumferentially circulated to the conical cylinder 4 through the several air pipes 7. Due to the conical structure, its diameter is gradually reduced, so that the wind speed is increased, and the yarn can be effectively pushed by wind pressure. The design of the conical cylinder 4 forms a multi-stage push, thereby improving the pushing effect of the wind pressure on the yarn, ensuring that the weft yarn has sufficient travel force, and ensuring that the yarn can move smoothly and quickly. The spiral groove 5 is used to guide the high-pressure gas, and the spiral wind force generated by the spiral flow is used to center the yarn. At the same time, the axial high-pressure wind force is used to guide the yarn for weft insertion and ejection, and the suction force generated by the auxiliary suction nozzle 16 is used to assist in attracting the ejected yarn, reducing the diffusion of the airflow, further improving the travel force of the yarn, and can effectively improve the efficiency and accuracy of the weft guidance of the yarn.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A weft insertion and selection device for an air jet loom, characterized in that: include: A mounting frame (1), one end of which is provided with a placement frame (2) for placing a yarn bobbin; A nozzle (3) is horizontally arranged on a mounting frame (1), wherein a plurality of conical cylinders (4) are coaxially connected inside the nozzle (3), wherein the inner wall of the conical cylinder (4) is provided with a plurality of spiral grooves (5) distributed in an annular shape, and an outer wall of the nozzle (3) is provided with a plurality of gas ring shells (6) in an array, wherein the plurality of gas ring shells (6) correspond one-to-one to the plurality of conical cylinders (4), and a plurality of gas pipes (7) distributed in an annular shape are connected between the gas ring shells (6) and the conical cylinder (4), and the plurality of gas pipes (7) correspond one-to-one to the plurality of spiral grooves (5); The air supply mechanism (8) comprises an air pump (801) arranged on the mounting frame (1), wherein the air outlet end of the air pump (801) is connected to a plurality of first delivery pipes (803) via a branching head (802), and the plurality of first delivery pipes (803) are respectively connected to a plurality of air ring casings (6) one by one.

2. The weft insertion and selection device of the air jet loom according to claim 1, characterized in that: A fixed-length weft storage device (9) is provided on the placing rack (2), and a guide ring (10) is connected to the placing rack (2) via a support rod.

3. The weft insertion and selection device of the air jet loom according to claim 1, characterized in that: The nozzle (3) is rotatably connected to the mounting frame (1); the air ring shell (6) comprises an annular air shell (601) arranged on the nozzle (3); the outer peripheral side of the annular air shell (601) has an annular opening and an annular sealing plate (602) is rotatably arranged in the annular opening; the air pipe (7) is connected to the annular air shell (601); the first delivery pipe (803) is connected to the annular sealing plate (602); a motor (11) is arranged on the mounting frame (1); and a first pulley assembly (12) is connected between the output shaft of the motor (11) and the nozzle (3).

4. The weft insertion and selection device of the air jet loom according to claim 3, characterized in that: The inner wall of the annular air shell (601) is configured with a guiding inclined surface (13), and a plurality of air pipes (7) are arranged at an inclination.

5. The weft insertion and selection device of the air jet loom according to claim 3, characterized in that: A rotating sealing ring (14) is provided between the annular sealing plate (602) and the annular gas shell (601).

6. The weft insertion and selection device of the air jet loom according to claim 3, characterized in that: An auxiliary suction nozzle (16) coaxial with the nozzle (3) is provided at one end of the mounting frame (1) away from the nozzle (3) through a support plate (15), and a second delivery pipe (17) is connected between the auxiliary suction nozzle (16) and the air extraction end of the air pump (801).

7. The weft insertion and selection device of the air jet loom according to claim 6, characterized in that: The second delivery pipe (17) is connected to a filter box (18) arranged on the mounting frame (1), and a filter screen (19) is arranged in the filter box (18).

8. The weft insertion and selection device of the air jet loom according to claim 7, characterized in that: A shaft (20) is rotatably inserted through the filter box (18); the filter screen (19) is enclosed in a cylindrical shape and is coaxially arranged on the shaft (20) via a connecting rod; the inner wall of the filter box (18) is provided with a baffle (21) whose ends overlap the filter screen (19); and a driving member (22) for driving the shaft (20) to rotate is provided on the mounting frame (1).

9. The weft insertion and selection device of the air jet loom according to claim 8, characterized in that: The driving member (22) comprises a first guide rod (2201) and a second guide rod (2202) rotatably arranged on the mounting frame (1); one end of the first guide rod (2201) is connected to the motor (11); the first guide rod (2201) and the second guide rod (2202) are transmission-connected via a bevel gear assembly (2203); and a second pulley assembly (2204) is connected between the second guide rod (2202) and the shaft rod (20).

10. The weft insertion and selection device of the air jet loom according to claim 1, characterized in that: A ring plate (23) is provided at one end of the nozzle (3) close to the placement rack (2), and a guide cylinder (24) is provided inside the nozzle (3) and between two adjacent conical cylinders (4).

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