Weft-catching device for air-jet loom

Abstract

The present application relates to a weft catching device of an air jet loom, which includes a mounting frame, a guide tube, a negative pressure assembly and a clamping assembly for clamping weft yarn, one end of the guide tube is arranged on the mounting frame, the mounting frame is provided with a connecting hole, the connecting hole is arranged coaxially with the guide tube, the negative pressure assembly includes a negative pressure ring fan, a plurality of negative pressure tubes, a plurality of connecting tubes and a driving member, the negative pressure ring fan is rotatably connected to the inner side wall of the connecting hole, the driving member is used to drive the negative pressure ring fan to rotate, one end of the connecting tube is arranged on the mounting frame and is connected to the air outlet end of the negative pressure ring fan, a plurality of negative pressure tubes correspond to a plurality of connecting tubes one by one, one end of the negative pressure tube is arranged on the other end of the connecting tube, the other end of the negative pressure tube penetrates into the guide tube and faces the connecting hole, and the clamping assembly is located on the side of the negative pressure ring fan away from the guide tube. The present application has the effect of facilitating the weft yarn to enter the weft catcher.

Description

Technical Field

[0001] This application relates to the field of air-jet looms, and particularly to a weft-catching device for an air-jet loom. Background Art

[0002] An air-jet loom is a device that uses compressed air jets to draw the weft yarn, passing the weft yarn through the shed for fabric weaving, featuring high weaving speed and high labor productivity.

[0003] Air-jet weft insertion is a passive weft insertion method. The weft yarn has low tension and no control when flying through the shed. Therefore, a weft-catching device is provided on the side opposite to the air-jet orifice of the air-jet loom. The weft-catching device is used to attract and clamp the weft yarn passing through the shed. The air-jet loom will perform hemming operations on the weft yarn to fix the weft yarn on the fabric.

[0004] Currently, Chinese Patent Publication No. CN105671751A discloses a sliding positioning type weft catcher, including a frame-shaped track provided at the weft-catching end of the loom. A frame-shaped optical sensor is provided at the rear side of the frame-shaped track. Four chutes are provided inside the frame-shaped track. Two sliders driven by motors are provided in each chute. The sliders in the relatively arranged chutes are correspondingly connected by two parallel metal wires. The motors and the sliders are electrically connected to the frame-shaped optical sensor. The metal wires are driven by the motors to rotate in opposite directions. In the present invention, when the frame-shaped optical sensor detects that the weft yarn has passed through, the motors are started, and the sliders drive the parallel metal wires to move quickly towards each other from the edge of the frame-shaped track. Since the quadrilateral formed by the four parallel metal wires becomes smaller and smaller, finally the weft yarn is limited to the center of the frame-shaped track. At the same time, since the mutually parallel metal wires rotate inwards, the weft yarn can be tightened to prevent it from falling off.

[0005] Regarding the above related technologies, the inventor believes that there are the following defects: The weft yarn is light in texture, and the air jet of the air-jet loom is the only power source for the weft yarn to fly. When the weft yarn leaves the air-jet orifice of the air-jet loom, the weft yarn is affected by its own gravity, impurities at the shed, and messy fluff, resulting in a decrease in speed. The speed of the weft yarn drops too fast, resulting in a decrease in the moving distance of the head of the weft yarn, and even unable to reach the weft catcher. The weft yarn woven on the fabric cannot be tightened, resulting in poor fabric quality. Summary of the Invention

[0006] In order to facilitate the weft yarn to enter the weft catcher, this application provides a weft-catching device for an air-jet loom.

[0007] A weft-catching device for an air-jet loom provided by this application adopts the following technical solution:

[0008] A weft-catching device for a jet loom, comprising a mounting frame, a guiding tube, a negative pressure assembly, and a clamping assembly for clamping the weft yarn. One end of the guiding tube is arranged on the mounting frame. The mounting frame is provided with a communication hole, and the communication hole is coaxially arranged with the guiding tube. The negative pressure assembly includes a negative pressure ring fan, a plurality of negative pressure tubes, a plurality of connecting tubes, and a driving member. The negative pressure ring fan is rotatably connected to the inner side wall of the communication hole. The driving member is used to drive the negative pressure ring fan to rotate. One end of the connecting tube is arranged on the mounting frame and communicated with the air outlet end of the negative pressure ring fan. A plurality of negative pressure tubes correspond to the plurality of connecting tubes one by one. One end of the negative pressure tube is arranged on the other end of the connecting tube, and the other end of the negative pressure tube penetrates into the guiding tube and faces the communication hole. The clamping assembly is located on the side of the negative pressure ring fan away from the guiding tube.

[0009] By adopting the above technical solution, the driving member drives the negative pressure ring fan to rotate. The negative pressure ring fan blows air towards the connecting tube, and then blows towards the negative pressure tube through the connecting tube. The negative pressure tube faces the inside of the communication hole, greatly increasing the gas flow rate in the communication hole, and greatly reducing the air pressure in the communication hole and the guiding tube. After the weft yarn leaps, due to the low air pressure in the guiding tube, the weft yarn moves towards the inside of the guiding tube. As the weft yarn gradually enters the deep part of the guiding tube, the air pressure is even lower until the weft yarn enters the communication hole and is tightened. Then, the clamping assembly clamps and catches the weft yarn, keeping the weft yarn in a tightened state.

[0010] Optionally, the clamping assembly includes a clamping member, an infrared sensor, and a driving member. The clamping member includes two clamping rods. The two clamping rods are circumferentially distributed along the axis of the communication hole. One end of the clamping rod is rotatably connected to the mounting frame along the axis parallel to the axis of the communication hole. The clamping rod penetrates into the communication hole. The infrared sensor is arranged in the communication hole. The infrared sensor is used to control the driving member, and the driving member is used to drive the two clamping rods to approach each other.

[0011] By adopting the above technical solution, when the infrared sensor senses that the weft yarn enters the communication hole, the infrared sensor controls the driving member to start. The driving member drives the two clamping rods to rotate, and the clamping rods rotate to clamp the weft yarn. The structure of the clamping assembly is simple, facilitating the operation of catching the weft yarn.

[0012] Optionally, the clamping assembly includes two clamping members. The two clamping members are distributed along the axis direction of the communication hole, and the two clamping members are used to clamp the weft yarn in different directions.

[0013] By adopting the above technical solution, through the combined action of the two clamping members on the weft yarn, the weft yarn is parallel to the axis of the communication hole. By the two clamping members, the unique position of the weft yarn capture is ensured, and the position of clamping the weft yarn each time is unified, improving the parallelism of each weft and the weaving quality of the fabric.

[0014] Optionally, the driving member includes four driving gears, a driving internal gear ring, a mounting strip, a sliding rod, and a driving cylinder. The four driving gears correspond to the four clamping rods one by one. The driving gears are arranged on the rotation axes of the clamping rods. The driving internal gear ring is rotatably connected to the mounting frame. The driving gears are meshed with the driving internal gear ring. One end of the mounting strip is arranged on the driving internal gear ring. The sliding rod is slidably connected to the mounting strip along the radial direction of the driving internal gear ring. The cylinder block of the driving cylinder is arranged on the mounting frame. The sliding rod is arranged on the piston rod of the driving cylinder.

[0015] By adopting the above technical solution, after the infrared sensor receives the signal that the weft yarn enters the communication hole, the infrared sensor drives the piston rod of the driving cylinder to contract. The sliding rod slides on the mounting strip under the contraction of the driving cylinder. The mounting strip drives the driving internal gear ring to rotate. The driving internal gear ring drives the four driving gears to rotate. The clamping rods corresponding to the driving gears rotate. The clamping rods of the same clamping member approach each other to clamp the weft yarn. The driving member has a simple structure and high transmission efficiency, and realizes rapid clamping, improves the weft-catching efficiency, and is convenient for adapting to the working efficiency of rapid weaving of air-jet looms.

[0016] Optionally, the guiding tube is in a horn shape. The narrow end of the guiding tube is arranged on the mounting frame. The flared end of the guiding tube faces the moving direction of the weft yarn.

[0017] By adopting the above technical solution, the horn-shaped guiding tube improves the tolerance for the weft yarn to enter the position of the guiding tube; even if the weft yarn is affected by gravity or stray yarn and causes the weft yarn to drop too fast longitudinally, the weft yarn at a lower position can be attracted through the flared end of the horn shape, which is convenient for the weft yarn to enter the weft-catching device.

[0018] Optionally, the driving member includes a driving gear ring, a driving gear, and a driving motor. The driving gear ring is sleeved on the negative pressure ring fan. The driving motor is arranged on the mounting frame. The driving gear is arranged on the output shaft of the driving motor. The driving gear is meshed with the driving gear ring.

[0019] By adopting the above technical solution, the driving motor drives the driving gear to rotate. The driving gear drives the driving gear ring to rotate. The driving gear ring drives the negative pressure ring fan to rotate. The rotation of the negative pressure ring fan causes the gas to sequentially pass through the connecting pipe and enter the negative pressure pipe. The gas in the negative pressure pipe blows into the communication hole, reducing the negative pressure in the communication hole, which is convenient for the weft yarn to move towards the communication hole. And the negative pressure ring fan reduces the direct contact between the weft yarn and the fan blades, and the weft yarn can pass through the center of the negative pressure ring fan until it reaches the clamping assembly. The driving member has a simple structure, is convenient for driving the rotation of the negative pressure ring fan, and has a reasonable structure.

[0020] Optionally, the connecting pipe includes a fixed pipe and a corrugated pipe. One end of the fixed pipe communicates with the air outlet end of the negative pressure ring fan. One end of the corrugated pipe is connected to the other end of the fixed pipe, and the other end of the corrugated pipe is connected to the end of the negative pressure pipe away from the guiding pipe. The negative pressure pipe is rotatably connected to the guiding pipe along the tangential direction of the guiding pipe, and an adjusting assembly for adjusting the air outlet direction of a plurality of negative pressure pipes is arranged on the mounting rack.

[0021] By adopting the above technical solution, for different qualities of weft yarns, if the weft yarn is too tightly stretched, it is easy to cause the elasticity of the fabric to decrease or even break; the staff can adjust the air outlet direction of the negative pressure pipe through the adjusting assembly to change the negative pressure in the communication hole; the negative pressure pipe is connected to the fixed pipe through the corrugated pipe, and the angle change between the negative pressure pipe and the fixed pipe is compensated by the corrugated pipe, so that the negative pressure pipe can stably blow air into the communication hole.

[0022] Optionally, the adjusting assembly includes a plurality of sliding sleeves, a plurality of sliding blocks, a sliding ring and a control member. The plurality of sliding blocks correspond to the plurality of negative pressure pipes one by one. The sliding blocks are slidably connected to the guiding pipe along the flaring direction of the side wall of the guiding pipe. The plurality of sliding sleeves correspond to the plurality of sliding blocks one by one. The sliding sleeves are sleeved on the negative pressure pipes. The sliding sleeves are rotatably connected to the sliding blocks along the tangential direction of the guiding pipe. The sliding ring is coaxially arranged with the guiding pipe and is slidably connected to the mounting rack along the axial direction of the guiding pipe. The sliding blocks are slidably connected to the sliding ring, and the control member is used to control the movement of the sliding ring.

[0023] By adopting the above technical solution, the control member drives the sliding ring to move, the sliding ring drives the sliding blocks to move, and the sliding blocks drive the sliding sleeves to move. Since the negative pressure pipe is rotatably connected to the guiding pipe, the sliding sleeves drive the negative pressure pipe to rotate. When the negative pressure pipe rotates, the direction of the gas blown out by the negative pressure pipe changes. The direction of the gas blown out by the negative pressure pipe changes the air flow rate in the communication hole, and by changing the flow rate, the air pressure in the communication hole is changed, thereby changing the tension degree of the weft yarn.

[0024] Optionally, the control member includes an internally threaded pipe and a plurality of turning handles. The internally threaded pipe is coaxially arranged with the sliding ring. The internally threaded pipe is rotatably connected to the frame, and the sliding ring is threadedly connected to the internally threaded pipe. The plurality of turning handles are arranged on the outer side wall of the internally threaded pipe.

[0025] By adopting the above technical solution, the staff rotates the handle, the handle drives the internally threaded tube to rotate, the internally threaded tube drives the sliding ring to approach or move away from the guiding tube, the sliding ring drives a number of speech blocks to move, the movement of the sliding block drives the sliding sleeve to move, the movement of the sliding sleeve drives the negative pressure tube to rotate, the rotation of the negative pressure tube changes the blowing direction of the negative pressure tube, and the air pressure in the communication hole is changed by the control member. The change in the air pressure in the communication hole changes the tension degree of the weft yarn, making the equipment applicable to weft yarns with different tension degrees, improving the quality of the woven fabric, and expanding the applicable range of the equipment.

[0026] Optionally, a number of guiding grooves are provided on the inner side wall of the guiding tube, and the number of guiding grooves corresponds to the number of negative pressure tubes one by one. The guiding grooves are used to guide the gas in the negative pressure tube to move towards the communication hole.

[0027] By adopting the above technical solution, the guiding grooves are used to gather the gas in the negative pressure tube, and better move the gas blown out of the negative pressure tube towards the communication hole.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The negative pressure assembly is used to guide the weft yarn to move towards the clamping assembly, facilitating the clamping of the weft yarn by the clamping assembly;

[0030] 2. The driving member is used to drive the two groups of clamping members to move simultaneously, and the weft yarn is clamped by the clamping rods of the clamping members;

[0031] 3. The adjusting assembly is used to adjust the blowing direction of the air flow in the negative pressure tube. Description of the Drawings

[0032] Figure 1 is the weft catching device of an air-jet loom.

[0033] Figure 2 is Figure 1 the cross-sectional view along the A-A section line in

[0034] Figure 3 is Figure 1 the cross-sectional view of the installation tube in

[0035] Figure 4 is Figure 3 the enlarged view of part A in

[0036] Figure numerals: 1, mounting frame; 11, mounting plate; 12, first vertical plate; 13, second vertical plate; 14, mounting column; 141, connecting hole; 142, mounting groove; 143, accommodating ring groove; 144, adapting groove; 2, guide tube; 21, matching groove; 22, guide groove; 3, negative pressure assembly; 31, negative pressure ring fan; 311, outer ring; 312, inner ring; 313, fan blade; 32, negative pressure tube; 33, connecting tube; 331, fixing tube; 332, bellows; 34, driving member; 341, driving gear ring; 342, driving Gear; 343, drive motor; 4, clamping assembly; 41, clamping member; 411, clamping rod; 42, infrared sensor; 43, driving member; 431, driving gear; 432, driving inner ring; 433, mounting strip; 434, sliding rod; 435, driving cylinder; 436, driving groove; 5, adjusting assembly; 51, sliding sleeve; 52, sliding block; 521, sliding plate; 522, connecting rod; 523, rotating block; 53, sliding ring; 531, sliding groove; 54, control member; 541, threaded tube; 542, turning handle. DETAILED DESCRIPTION

[0037] The following is combined with Figures 1-4 This application is described in further detail.

[0038] The present application embodiment discloses a weft catching device for an air jet loom. Figure 1 and Figure 2 A weft catching device of an air jet loom comprises a mounting frame 1, a guide tube 2, a negative pressure assembly 3 and a clamping assembly 4. The mounting frame 1 comprises a mounting plate 11, a first vertical plate 12, a second vertical plate 13 and a mounting column 14. The mounting plate 11 is horizontally arranged. The first vertical plate 12 and the second vertical plate 13 are distributed along the flying direction of the weft. The end surface of the first vertical plate 12 and the end surface of the second vertical plate 13 are perpendicular to the flying direction of the weft. The first vertical plate 12 is fixedly arranged on the upper end surface of the mounting plate 11. The second vertical plate 13 is located at the first vertical plate 12 away from the launching direction of the weft. direction, the second vertical plate 13 is fixedly arranged on the upper end surface of the mounting plate 11, the length direction of the mounting column 14 is parallel to the flying direction of the latitude, the mounting column 14 is fixedly arranged on the upper end surface of the second vertical plate 13, and the mounting column 14 is provided with a connecting hole 141 along the flying direction of the latitude, the connecting hole 141 penetrates the mounting column 14, the guide tube 2 is coaxially arranged with the mounting column 14, the guide tube 2 is trumpet-shaped, the end of the guide tube 2 with a larger diameter faces the launching direction of the latitude, the end of the guide tube 2 with a smaller diameter is fixed on one end of the mounting column 14, and the guide tube 2 is connected with the connecting hole 141.

[0039] refer to Figure 2 and Figure 3, the negative pressure assembly 3 includes a negative pressure ring fan 31, a plurality of negative pressure pipes 32, a plurality of connecting pipes 33 and a driving member 34. An installation groove 142 is formed on the end face of the installation column 14 facing away from the guiding pipe 2. The installation groove 142 is coaxially arranged with the communication hole 141 and extends along the length direction of the installation column 14. The negative pressure ring fan 31 includes an outer ring 311, an inner ring 312 and a plurality of fan blades 313. The outer ring 311 is coaxially arranged with the installation column 14, and the outer ring 311 is rotatably connected to the inner side wall of the installation groove 142. The plurality of fan blades 313 are evenly distributed circumferentially along the axis of the outer ring 311. One end of the fan blade 313 is fixedly arranged on the inner side wall of the outer ring 311. The inner ring 312 is coaxially arranged with the outer ring 311, and the other end of the fan blade 313 is fixedly arranged on the outer side wall of the inner ring 312. A receiving ring groove 143 is formed on the inner side wall of the installation groove 142. The driving member 34 includes a driving gear ring 341, a driving gear 342 and a driving motor 343. The driving gear ring 341 is coaxially arranged with the outer ring 311. The driving gear ring 341 is located in the receiving ring groove 143 and is fixedly arranged on the outer side wall of the outer ring 311. The driving motor 343 is fixedly arranged on the second vertical plate 13. The output shaft of the driving motor 343 is parallel to the axis direction of the installation column 14. The driving gear 342 is vertically arranged and is fixedly arranged on the output shaft of the driving motor 343. The driving gear 342 penetrates into the receiving ring groove 143 and meshes with the driving gear ring 341.

[0040] Reference Figure 2 and Figure 3 , the plurality of connecting pipes 33 are evenly distributed circumferentially along the axis of the installation column 14. The connecting pipe 33 includes a fixed pipe 331 and a corrugated pipe 332. The fixed pipe 331 is located outside the guiding pipe 2. One end of the fixed pipe 331 is fixedly arranged on the end face of the installation column 14 facing the weft yarn emission direction. The fixed pipe 331 is communicated with the installation groove 142. One end of the corrugated pipe 332 is fixedly arranged on the end of the fixed pipe 331 facing away from the installation column 14. The plurality of negative pressure pipes 32 correspond to the plurality of connecting pipes 33 one by one. One end of the negative pressure pipe 32 is fixedly arranged on the end of the corrugated pipe 332 facing away from the fixed pipe 331. A plurality of matching grooves 21 are formed on the end face of the guiding pipe 2 facing away from the installation column 14. The matching grooves 21 extend along the length direction of the guiding pipe 2. The plurality of matching grooves 21 correspond to the plurality of negative pressure pipes 32 one by one. The negative pressure pipe 32 is rotatably connected to the matching groove 21 along the radial direction of the guiding pipe 2. The end of the negative pressure pipe 32 facing away from the corrugated pipe 332 faces the axis direction of the communication hole 141. A guiding groove 22 is formed on the end face of the matching groove 21 facing away from the installation column 14. The guiding groove 22 is communicated with the inner side wall of the negative pressure pipe 32. The angle between the length direction of the guiding groove 22 and the axis direction of the guiding pipe 2 is smaller than the inclination angle of the pipe wall of the guiding pipe 2.

[0041] Reference Figure 2 and Figure 4, an adjusting assembly 5 for adjusting the angle of the negative pressure pipe 32 is arranged on the first vertical plate 12. The adjusting assembly 5 includes a plurality of sliding sleeves 51, a plurality of sliding blocks 52, a sliding ring 53 and a control member 54. The control member 54 includes a threaded pipe 541 and a plurality of turning handles 542. The threaded pipe 541 is coaxially arranged with the guiding pipe 2. The threaded pipe 541 is rotatably connected to the first vertical plate 12. The length direction of the turning handle 542 is parallel to the radial direction of the threaded pipe 541. One end of the turning handle 542 is fixedly arranged on the outer side wall of the threaded pipe 541. The plurality of turning handles 542 are evenly distributed circumferentially along the axis of the threaded pipe 541. The sliding ring 53 is threadedly connected to the threaded pipe 541. A plurality of sliding grooves 531 are formed on the end face of the sliding ring 53 facing the guiding pipe 2. The sliding grooves 531 extend along the axial direction of the sliding ring 53. The length direction of the sliding grooves 531 is parallel to the radial direction of the sliding ring 53. The plurality of sliding grooves 531 correspond to the plurality of negative pressure pipes 32 one by one. The plurality of sliding blocks 52 correspond to the plurality of sliding grooves 531 one by one. The sliding block 52 includes a sliding plate 521, two connecting rods 522 and two rotating blocks 523. The sliding plate 521 is slidably connected to the sliding groove 531. The two connecting rods 522 are distributed along the tangent direction of the sliding block 52. The length direction of the connecting rod 522 is parallel to the inclination angle of the pipe wall of the guiding pipe 2. One end of the connecting rod 522 is fixedly arranged on the sliding plate 521. The two rotating blocks 523 correspond to the two connecting rods 522 one by one. The rotating block 523 is fixedly arranged on the end of the connecting rod 522 away from the sliding plate 521. The plurality of sliding sleeves 51 correspond to the plurality of sliding blocks 52 one by one. The sliding sleeve 51 is located between the two rotating blocks 523. The sliding sleeve 51 is sleeved on the negative pressure pipe 32. The sliding sleeve 51 is rotatably connected to the rotating block 523.

[0042] Reference Figure 2 and Figure 3 , the clamping assembly 4 is located on the side of the negative pressure ring fan 31 away from the guiding pipe 2. The clamping assembly 4 is located in the mounting groove 142. The clamping assembly 4 includes two clamping members 41, an infrared sensor 42 and a driving member 43. The two clamping members 41 are distributed along the extending direction of the mounting groove 142. The clamping member 41 includes two clamping rods 411. The two clamping rods 411 are evenly distributed circumferentially along the axis of the mounting groove 142. The two clamping members 41 are perpendicular to each other along the axis of the mounting groove 142. Four fitting grooves 144 are formed on the inner side wall of the mounting groove 142. The four fitting grooves 144 penetrate through the mounting groove 142. The four fitting grooves 144 correspond to the four clamping rods 411 one by one. One end of the clamping rod 411 is rotatably connected to the fitting groove 144. The infrared sensor 42 is fixedly arranged on the inner side wall of the mounting groove 142.

[0043] Reference Figure 2 and Figure 3, the driving member 43 includes four driving gears 431, a driving internal gear ring 432, a mounting bar 433, a sliding rod 434, and a driving cylinder 435. The four driving gears 431 correspond to the four clamping rods 411 one by one. The driving gears 431 and the rotating axes of the clamping rods 411 are coaxially arranged. The driving gears 431 are fixedly arranged on the rotating axes of the clamping rods 411. The driving internal gear ring 432 is sleeved on the outer side wall of the mounting column 14. The driving internal gear ring 432 is rotatably connected to the mounting column 14. The driving internal gear ring 432 meshes with the four driving gears 431. The length direction of the mounting bar 433 is parallel to the radial direction of the driving internal gear ring 432. One end of the mounting bar 433 is fixedly arranged on the outer side wall of the driving internal gear ring 432. A driving groove 436 is formed in the mounting bar 433 along the length direction of the mounting bar 433. The driving groove 436 penetrates through the mounting bar 433. The driving cylinder 435 is vertically arranged. The cylinder body of the driving cylinder 435 is fixedly arranged on the upper end surface of the mounting plate 11. The sliding rod 434 is horizontally arranged. The sliding rod 434 is fixedly arranged on the piston rod of the driving cylinder 435. The sliding rod 434 is slidably connected in the driving groove 436.

[0044] The implementation principle of the weft catching device of a jet loom in an embodiment of the present application is as follows: When the shuttleless loom works, high-speed air is ejected from the jet orifice. The high-speed air drives the weft yarn to fly through the shed. After the weft yarn passes through the shed, under the action of the negative pressure assembly 3, it enters the guiding tube 2. Through the guiding of the negative pressure tube 32 in the guiding tube 2, the weft yarn is tightened in the communication hole 141. The weft yarn is clamped by the clamping assembly 4 to maintain a tightened state. Then, the weft yarn is fixed on the fabric by the selvage twisting assembly to complete the weaving of one weft.

[0045] The weft catching device drives the driving gear 342 to rotate by driving the motor 343. The driving gear 342 drives the driving internal gear ring 341 to rotate. The driving internal gear ring 341 drives the negative pressure ring fan 31 to rotate. The negative pressure ring fan 31 allows air to enter the fixed tube 331. Through the fixed tube 331, it enters the corrugated tube 332. Then, through the corrugated tube 332, it enters the negative pressure tube 32. The air in the negative pressure tube 32 moves towards the communication hole 141, greatly increasing the air flow rate at the communication hole 141. A negative pressure is generated at the communication hole 141, facilitating the straightening of the weft yarn at the communication hole 141.

[0046] Due to the different diameters of the weft yarns, the forces required to tighten the weft yarns are different. If a thinner weft yarn is subjected to a greater tightening force, it is likely to break. The staff can adjust the adjustment component 5 to adapt to weft yarns of different diameters. The staff rotates the handle 542, and the handle 542 drives the threaded tube 541 to rotate. The rotation of the threaded tube 541 causes the sliding ring 53 to move. The sliding ring 53 drives the sliding block 52 to move, and the sliding block 52 drives the sliding sleeve 51 to move. Driven by the movement of the sliding sleeve 51, the negative pressure tube 32 rotates on the guide tube 2. The rotation of the negative pressure tube 32 changes the orientation of the air flow direction inside the negative pressure tube 32, changes the air volume in the communication hole 141 in the negative pressure tube 32, changes the negative pressure in the communication hole 141, and changes the tension degree of the weft yarn. The guide groove 22 facilitates the movement of air into the communication hole 141 as much as possible when the negative pressure tube 32 is closely attached to the guide tube 2.

[0047] When the weft yarn is tightened in the communication hole, the infrared sensor 42 detects the weft yarn. The infrared sensor 42 drives the piston rod of the cylinder to contract. The piston rod drives the sliding rod 434 to move. The sliding rod 434 slides in the driving groove 436 and rotates the mounting strip 433 along the mounting column 14. The mounting strip 433 drives the driving internal gear ring 432 to rotate. The driving internal gear ring 432 drives the driving gear 431 to rotate. The four driving gears 431 rotate, and the four driving gears 431 drive the four clamping rods 411 to rotate. The four clamping rods 411 act on each other in pairs to clamp the weft yarn and keep the weft yarn always on the axis of the mounting column 14, maintaining the tension position of the weft yarn unchanged and improving the weaving quality of the weft yarn.

[0048] The above are all the preferred embodiments of this application. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A weft-catching device for a jet loom, characterized in that: It includes a mounting bracket (1), a guiding tube (2), a negative pressure assembly (3), and a clamping assembly (4) for clamping the weft yarn. One end of the guiding tube (2) is arranged on the mounting bracket (1). The mounting bracket (1) is provided with a communication hole (141), and the communication hole (141) is coaxially arranged with the guiding tube (2). The negative pressure assembly (3) includes a negative pressure ring fan (31), a plurality of negative pressure tubes (32), a plurality of connecting tubes (33), and a driving member (34). The negative pressure ring fan (31) is rotatably connected to the inner side wall of the communication hole (141). The driving member (34) is used to drive the negative pressure ring fan (31) to rotate. One end of the connecting tube (33) is arranged on the mounting bracket (1) and is communicated with the air outlet end of the negative pressure ring fan (31). A plurality of negative pressure tubes (32) correspond to the plurality of connecting tubes (33) one by one. One end of the negative pressure tube (32) is arranged on the other end of the connecting tube (33). The other end of the negative pressure tube (32) penetrates into the guiding tube (2) and faces the communication hole (141). The clamping assembly (4) is located on the side of the negative pressure ring fan (31) away from the guiding tube (2). The driving member (34) includes a driving gear ring (341), a driving gear (342), and a driving motor (343). The driving gear ring (341) is sleeved on the negative pressure ring fan (31). The driving motor (343) is arranged on the mounting bracket (1). The driving gear (342) is arranged on the output shaft of the driving motor (343). The driving gear (342) meshes with the driving gear ring (341). The connecting tube (33) includes a fixed tube (331) and a corrugated tube (332). One end of the fixed tube (331) is communicated with the air outlet end of the negative pressure ring fan (31). One end of the corrugated tube (332) is connected to the other end of the fixed tube (331). The other end of the corrugated tube (332) is connected to the end of the negative pressure tube (32) away from the guiding tube (2). The negative pressure tube (32) is rotatably connected to the guiding tube (2) along the tangential direction of the guiding tube (2). An adjusting assembly (5) for adjusting the air outlet direction of a plurality of negative pressure tubes (32) is arranged on the mounting bracket (1).The adjusting assembly (5) includes a plurality of sliding sleeves (51), a plurality of sliding blocks (52), a sliding ring (53) and a control member (54). The plurality of sliding blocks (52) correspond to the plurality of negative pressure pipes (32) one by one. The sliding blocks (52) are slidably connected to the guiding pipe (2) along the flaring direction of the side wall of the guiding pipe (2). The plurality of sliding sleeves (51) correspond to the plurality of sliding blocks (52) one by one. The sliding sleeves (51) are sleeved on the negative pressure pipes (32). The sliding sleeves (51) are rotatably connected to the sliding blocks (52) along the tangential direction of the guiding pipe (2). The sliding ring (53) is coaxially arranged with the guiding pipe (2). The sliding ring (53) is slidably connected to the mounting bracket (1) along the axial direction of the guiding pipe (2). The sliding blocks (52) are slidably connected to the sliding ring (53) along the radial direction of the sliding ring (53). The control member (54) is used to control the movement of the sliding ring (53).; 2. The weft catching device of a jet loom according to claim 1, characterized in that: The clamping assembly (4) includes a clamping member (41), an infrared sensor (42), and a driving member (43). The clamping member (41) includes two clamping rods (411). The two clamping rods (411) are circumferentially distributed along the axis of the communication hole (141). One end of the clamping rod (411) is rotatably connected to the mounting bracket (1) along an axis parallel to the axis of the communication hole (141). The clamping rod (411) penetrates into the communication hole (141). The infrared sensor (42) is arranged in the communication hole (141). The infrared sensor (42) is used to control the driving member (43), and the driving member (43) is used to drive the two clamping rods (411) to approach each other.

3. The weft catching device of a jet loom according to claim 2, characterized in that: The clamping assembly (4) includes two clamping members (41). The two clamping members (41) are distributed along the axis direction of the communication hole (141). The two clamping members (41) are used to clamp the weft yarn in different directions.

4. The weft catching device of a jet loom according to claim 3, characterized in that: The driving member (43) includes four driving gears (431), a driving internal gear ring (432), a mounting strip (433), a sliding rod (434), and a driving cylinder (435). The four driving gears (431) correspond to the four clamping rods (411) one by one. The driving gear (431) is arranged on the rotation axis of the clamping rod (411). The driving internal gear ring (432) is rotatably connected to the mounting bracket (1). The driving gear (431) meshes with the driving internal gear ring (432). One end of the mounting strip (433) is arranged on the driving internal gear ring (432). The sliding rod (434) is slidably connected to the mounting strip (433) along the radial direction of the driving internal gear ring (432). The cylinder body of the driving cylinder (435) is arranged on the mounting bracket (1). The sliding rod (434) is arranged on the piston rod of the driving cylinder (435).

5. The weft catching device of a jet loom according to claim 1, characterized in that: The guiding tube (2) is in a trumpet shape. The narrow end of the guiding tube (2) is arranged on the mounting bracket (1). The flared end of the guiding tube (2) faces the moving direction of the weft yarn.

6. The weft catching device of a jet loom according to claim 1, characterized in that: The control member (54) includes an internally threaded tube (541) and a plurality of turning handles (542). The internally threaded tube (541) is coaxially arranged with the sliding ring (53). The internally threaded tube (541) is rotatably connected to the frame. The sliding ring (53) is threadedly connected to the internally threaded tube (541). A plurality of turning handles (542) are arranged on the outer side wall of the internally threaded tube (541).

7. The weft-catching device of a jet loom according to claim 1, characterized in that: A plurality of guiding grooves (22) are formed on the inner side wall of the guiding tube (2). The plurality of guiding grooves (22) correspond to the plurality of negative pressure tubes (32) one by one. The guiding grooves (22) are used to guide the gas in the negative pressure tubes (32) to move towards the communication hole (141).

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