CN114525618A

CN114525618A - Yarn gripper for air-jet loom

Info

Publication number: CN114525618A
Application number: CN202210324003.5A
Authority: CN
Inventors: 黄振军
Original assignee: Nantong Xingtai Ginkgo Textile Machinery Co ltd
Current assignee: Nantong Xingtai Ginkgo Textile Machinery Co ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-05-24
Anticipated expiration: 2042-03-29
Also published as: CN114525618B

Abstract

The invention provides a yarn gripper for an air-jet loom, which comprises a bottom plate arranged below yarns, wherein the upper end of the bottom plate is fixedly connected with a mounting box, the upper end of the bottom plate is fixedly connected with a mounting block positioned on one side of the mounting box, one side of the mounting box is provided with a mounting plate, the side wall of the mounting plate is fixedly connected with a driving rod, the tail end of the driving rod penetrates through the mounting box and extends into the mounting box, the side walls of the mounting plate and the mounting block are fixedly connected with yarn gripping blocks, and a driving mechanism capable of driving the driving rod to move in a reciprocating mode is arranged in the mounting box. The yarn clamping device can tension loose yarn parts in the yarn clamping process, and the problem of limiting the yarn is solved.

Description

Yarn gripper for air-jet loom

Technical Field

The invention relates to the technical field of textile equipment, in particular to a yarn gripper for an air-jet loom.

Background

The air jet loom is one of the textile modes, is applied to industrial production in the last 70 th century, can realize high-speed textile production through years of improvement and production, and has the advantages of low material consumption, high efficiency, low noise and the like.

The yarn clamping device is an important component of the air jet loom, the yarn clamping device intermittently clamps a fabric in the weft insertion process to provide tension and prevent untwisting, but the yarn at the feeding end of the yarn clamping device can rapidly shake under the action of force at the moment of clamping and loosening in the yarn clamping process, dust hair adhered to the surface of the yarn clamping device can be shaken off in the shaking process, the yarn floats around to influence production, the yarn deviates from a preset position in the shaking process, unified and accurate processing cannot be realized, and the yarn clamping device for the air jet loom is needed for solving the problems.

Disclosure of Invention

In order to solve the problems, the invention provides a yarn gripper for an air-jet loom, which can tension loose yarn in the yarn gripping process and solve the problem of limiting the yarn.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a yarn gripper for an air-jet loom comprises a bottom plate arranged below yarns, wherein the upper end of the bottom plate is fixedly connected with an installation box, the upper end of the bottom plate is fixedly connected with an installation block positioned on one side of the installation box, an installation plate is arranged on one side of the installation box, a driving rod is fixedly connected to the side wall of the installation plate, the tail end of the driving rod penetrates through the installation box and extends into the installation box, yarn gripping blocks are fixedly connected to the side walls of the installation plate and the installation block, and a driving mechanism capable of driving the driving rod to reciprocate is arranged in the installation box;

the yarn pressing device comprises a base plate and is characterized in that a first mounting frame and a second mounting frame are fixedly connected to the upper end of the base plate, two yarn pressing barrels are installed between the first mounting frame and the second mounting frame and located on the upper side and the lower side of yarns respectively, a yarn pressing mechanism capable of driving the yarn pressing barrels to move is arranged on the base plate, and the yarn pressing mechanism can limit the yarns in the process of yarn clamping.

Preferably, actuating mechanism is including being fixed in the inside first motor of mounting box, the terminal fixedly connected with cam of first motor output shaft, the cam is located actuating lever one side and cooperates with it, be connected with first spring between mounting panel and the mounting box outer wall.

Preferably, press yarn mechanism including being located two first spacing framves of pressing the first side of yarn section of thick bamboo, two sleeves of fixedly connected with on the first spacing frame, the sleeve internal rotation is connected with flexible pivot, two flexible pivot is flexible terminal respectively with two pressure yarn section of thick bamboo lateral wall fixed connection, first the sleeve rotates with the second mounting bracket to be connected, be connected with torque spring between first spacing frame and the second mounting bracket, the pipe is dragged to bottom plate upper end fixedly connected with be located first spacing frame below, it has first piston to drag intraductal sliding connection, first piston upper end fixedly connected with pulls the pole, it runs through and pulls the pipe to pull the pole end, it is connected through the rope between pole end and the first spacing frame to pull, be equipped with the control mechanism that can drive and pull the pole removal in the installation piece.

Preferably, control mechanism is including inlaying the control tube of locating the installation piece inside, sliding connection has the second piston in the control tube, be connected with the second spring between second piston and the control tube inner wall, the control tube with pull and communicate through the connecting pipe between the pipe, the second piston has magnetism, the embedded magnet that is equipped with second piston matched with of mounting panel.

Preferably, two equal fixedly connected with band pulley of flexible pivot base end, two the band pulley overcoat is equipped with the belt, fixedly connected with second motor on the second mounting bracket, second motor output shaft end and one of them band pulley fixed connection, this band pulley is located first sleeve one side.

Preferably, the surface of the yarn pressing barrel is provided with a plurality of hair sucking ports, the hair sucking ports are communicated with a negative pressure pipe, and the negative pressure pipe is externally connected with a negative pressure device.

Preferably, fixedly connected with control tube on the first mounting bracket, sliding connection has the third piston in the control tube, third piston lateral wall fixedly connected with adjusts the pole, two press yarn section of thick bamboo second side to install the spacing frame of second, adjust the pole end and run through the control tube and rotate with the spacing frame of second and be connected, it has first pipeline and second pipeline to pull the pipe intercommunication, all be equipped with the check valve in first pipeline and the second pipeline, first pipeline end and control tube intercommunication, be connected with the third spring between third piston and the control tube inner wall, control tube one side is equipped with the pressure relief mechanism that can control the third piston position.

Preferably, the pressure relief mechanism includes the pressure release pipe with regulating tube one side fixed connection, sliding connection has the fourth piston in the pressure release pipe, fourth piston lateral wall fixed connection has the trigger bar, the terminal extension of trigger bar is in the regulating tube, communicate through the drain pipe between regulating tube and the pressure release pipe, the pressure release pipe lateral wall intercommunication has the fluid-discharge tube.

Preferably, a pair of clamping plates made of elastic materials is arranged in the pressure release pipe, the first clamping plate is fixedly connected with the pressure release pipe, and the second clamping plate is fixedly connected with the trigger rod.

The invention has the beneficial effects that:

1. through setting up two pressure yarn section of thick bamboos and be equipped with on pressing the yarn section of thick bamboo and inhale the mouth, when the yarn passed between two pressure yarn section of thick bamboos, press the yarn section of thick bamboo and can adsorb the dirt hair on yarn surface, guarantee that the local clean and tidy of yarn clamp guarantees normal production.

2. Can be close to the in-process of pressing the yarn at two clamp yarn pieces and pull first spacing frame through setting up yarn pressing mechanism, and then can make the position of pressing a yarn section of thick bamboo change, support the yarn and press, carry on spacingly to the relaxed yarn of pay-off end, guaranteed the yarn at the stability of transportation process, standardize the yarn process of pressing.

3. Through setting up second motor and two band pulleys can make two synchronous rotations of pressing a yarn section of thick bamboo, strengthen the clearance to yarn surface dirt hair, guarantee neatly.

4. Through setting up structure such as governing pipe, pressure release pipe, its reciprocating motion that can control yarn section of thick bamboo rule, further enhancement is to the clearance effect on yarn surface, guarantees yarn normal production.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A of the present invention;

FIG. 3 is a schematic perspective view of a yarn pressing cylinder according to the present invention;

FIG. 4 is a schematic view of the internal structure of the regulator tube and the pressure relief tube of the present invention;

FIG. 5 is a schematic view of the internal structure of the control tube according to the present invention;

FIG. 6 is a schematic view of the interior of a pull tube according to the present invention;

FIG. 7 is a schematic top view of the present invention;

FIG. 8 is a side view of the present invention.

In the figure: 1 bottom plate, 2 mounting boxes, 3 spacing ears, 4 yarns, 5 mounting blocks, 6 yarn clamping blocks, 7 mounting plates, 8 driving rods, 9 first springs, 10 first mounting frames, 11 second mounting frames, 12 pulling pipes, 13 second motors, 14 adjusting pipes, 15 sleeves, 16 telescopic rotating shafts, 17 yarn pressing cylinders, 18 first pipelines, 19 adjusting rods, 20 third pistons, 21 pressure relief pipes, 22 liquid outlet pipes, 23 liquid outlet pipes, 24 fourth pistons, 25 trigger rods, 26 clamping plates, 27 control pipes, 28 second pistons, 29 second springs, 30 connecting pipes, 31 second pipelines, 32 first pistons, 33 third springs, 34 pulling rods, 35 ropes, 36 belt wheels, 37 first limiting frames and 38 second limiting frames.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Referring to fig. 1-8, a yarn gripper for air-jet loom, including installing in bottom plate 1 of yarn 4 below, bottom plate 1 upper end fixedly connected with

mounting box

2, 1 upper end fixedly connected with of bottom plate is located the installation piece 5 of mounting box 2 one side, mounting box 2 one side is equipped with

mounting panel

7, 7 lateral wall fixedly connected with actuating lever 8 of mounting panel, 8 ends of actuating lever run through mounting box 2 and extend to its inside, the equal fixedly connected with of 5 lateral walls of mounting panel 7 and mounting block presss from both sides yarn piece 6, install spacing ear 3 in bottom plate 1 upper end, two spacing ears 3 are located the both sides of two clamp yarn pieces 6, spacing mouthful have been opened on the spacing ear 3, yarn 4 passes two spacing ears 3 and enters into between two clamp yarn pieces 6, two spacing ears 3 can realize further spacing to yarn 4, guaranteed yarn 4 in the middle of the process of walking the line stable.

Be equipped with the actuating mechanism that can drive 8 reciprocating motion of actuating lever in the mounting box 2, actuating mechanism is including being fixed in the inside first motor of mounting box 2, the terminal fixedly connected with cam of first motor output shaft, the cam is located 8 one sides of actuating lever and cooperates with it, be connected with first spring 9 between 2 outer walls of mounting panel 7 and the mounting box, first motor drives cam pivoted process and can protruding one side promote actuating lever 8 and move towards 5 directions of mounting block in, and then realize two processes of pressing from both sides the clamp yarn between the yarn piece 6, when the other one side of cam rotates to actuating lever 8 one side, 7 return stroke motion of mounting panel are pulled under the effect of first spring 9 this moment, from here the reciprocating motion process of mounting panel 7 has been realized, the double-layered yarn function of two double-layered yarn pieces 6 has been accomplished.

The utility model discloses a bottom plate 1 upper end fixedly connected with first mounting bracket 10 and second mounting bracket 11, install two pressure yarn section of thick bamboos 17 between first mounting bracket 10 and the second mounting bracket 11, two pressure yarn section of thick bamboos 17 are located the upper and lower both sides of yarn 4 respectively, it has a plurality of feather sucking ports to press yarn section of thick bamboo 17 surface to open, a plurality of feather sucking ports and negative pressure pipe intercommunication, the external negative pressure equipment of negative pressure pipe, two press yarn section of thick bamboo 17 to be located yarn 4 upper and lower both sides and the surface rather than offsetting, can be to pressing yarn section of thick bamboo 17 contact in the middle of the process of yarn 4 walking the yarn, can dispel its surperficial unnecessary dirt hair in the middle of the frictional process, and adsorb the dirt hair of will dispeling through negative pressure equipment, make can not produce too much dirt hair in the middle of the process of follow-up double-layered yarn vibrations, such accurate effective of hair absorption side formula, dirt hair becomes to absorb in the part, it is high to inhale the hair efficiency.

The bottom plate 1 is provided with a yarn pressing mechanism capable of driving the yarn pressing barrels 17 to move, wherein the yarn pressing mechanism can limit yarns in the yarn clamping process, the yarn pressing mechanism comprises a first limiting frame 37 positioned on the first side of the two yarn pressing barrels 17, the first limiting frame 37 is fixedly connected with two sleeves 15, telescopic rotating shafts 16 are rotationally connected in the sleeves 15, the telescopic tail ends of the two telescopic rotating shafts 16 are respectively and fixedly connected with the side walls of the two yarn pressing barrels 17, the base parts of the telescopic rotating shafts 16 rotate in the sleeves 15, the tail ends of the telescopic rotating shafts are connected with the yarn pressing barrels 17 and can keep stable, the yarn pressing barrels 17 can be driven to translate in the rotating process subsequently, the first sleeves 15 are rotationally connected with the second mounting frame 11, torsion springs are connected between the first limiting frame 37 and the second mounting frame 11, under the action of the torsion springs, the first limiting frame 37 is in a stable state, and the two yarn pressing barrels 17 can be ensured to be in a stable position in the state, the two yarn pressing barrels 17 are guaranteed to be abutted against the yarns 4, but cannot deform the yarns, and normal yarn running of the yarns 4 is guaranteed.

The pipe 12 of dragging that bottom plate 1 upper end fixedly connected with is located first spacing 37 below, it has first piston 32 to drag intraductal sliding connection of pipe 12, first piston 32 upper end fixedly connected with pulls pole 34, it runs through and pulls the pipe 12 to pull pole 34 end, it is connected through rope 35 to pull between pole 34 end and the first spacing 37, in the middle of the process of pulling rope 35, can be indirect drive first spacing 37 one side and move down, first spacing 37 one end is the centre of a circle this moment, other one end rotates round the centre of a circle, it extrudees 17 downwards to drive another pressure yarn section of thick bamboo this moment, and then can carry out spacing extrusion to the yarn 4 that send the material end lax in the middle of the process of pressing the yarn, can be further spacing to yarn 4, avoid its follow-up skew preset position of shaking of taking place, the yarn process is pressed violently in the influence.

The mounting block 5 is internally provided with a control mechanism capable of driving the pulling rod 34 to move, the control mechanism comprises a control tube 27 embedded in the mounting block 5, a second piston 28 is connected in the control tube 27 in a sliding manner, a second spring 29 is connected between the second piston 28 and the inner wall of the control tube 27, the control tube 27 is communicated with the pulling tube 12 through a connecting tube 30, the second piston 28 has magnetism, a magnet matched with the second piston 28 is embedded in the mounting plate 7, the connecting part of the connecting tube 30 and the control tube 27 is positioned on the left side, the connecting part of the connecting tube 30 and the pulling tube 12 is positioned on the upper side, in the process that the mounting plate 7 moves towards the mounting block 5, as the second piston 28 and the magnet repel each other, the second piston 28 pumps driving liquid on the left side of the second piston 28 above the first piston 32, and then pushes the first piston 32 to move downwards, and the downwards movement of the power pulling rod 34 is realized to achieve the effect of pulling, and in the process of the return stroke of the mounting plate 7, at the moment, under the action of the second spring 29, the second piston 28 is reset, at the moment, the liquid flows back to drive the first piston 32 to move, the whole reset is realized, and the initial state is returned.

The equal fixedly connected with band pulley 36 in two flexible pivot 16 base ends, two band pulley 36 overcoat are equipped with the belt, fixedly connected with second motor 13 on the second mounting bracket 11, second motor 13 output shaft end and one of them band pulley 36 fixed connection, this band pulley 36 is located first sleeve 15 one side, the belt is the cover of "8" word form and establishes in two band pulley 36 outsides, drive two synchronous rotations of pressing a yarn section of thick bamboo 17 under the drive of second motor 13, two press a yarn section of thick bamboo 17 and the partial rotation direction of yarn 4 contact and yarn 4 reverse opposite of walking the yarn, press a yarn section of thick bamboo 17 can guarantee the level and smooth of yarn 4 surface in the middle of the pivoted process, and can further strengthen getting rid of yarn 4 surface dust hair, strengthen the clearance effect.

The yarn pressing barrels 17 are in line contact with the yarns 4 in the rotating process, the hair absorption efficiency is gradually reduced in the long-term hair absorption process of the contact parts, and blockage can be caused under severe conditions, in order to further enhance the hair absorption effect, the adjusting pipe 14 is fixedly connected to the first mounting frame 10, the third piston 20 is connected in the adjusting pipe 14 in a sliding mode, the side wall of the third piston 20 is fixedly connected with the adjusting rod 19, the second limiting frames 38 are installed on the second sides of the two yarn pressing barrels 17, the two yarn pressing barrels 17 are respectively connected with the second limiting frames 38 in a rotating mode, the tail end of the adjusting rod 19 penetrates through the adjusting pipe 14 and is connected with the second limiting frames 38 in a rotating mode, the pulling pipe 12 is communicated with the first pipeline 18 and the second pipeline 31, one-way valves are arranged in the first pipeline 18 and the second pipeline 31, the tail end of the first pipeline 18 is communicated with the adjusting pipe 14, the first piston 32 can suck external driving liquid through the second pipeline 31 in the reciprocating moving process, and the liquid pumped into the adjusting pipe 14 through the first pipeline 18 pushes the third piston 20 to move, and the position of the yarn pressing barrel 17 is controlled through the adjusting rod 19, so that different parts of the yarn pressing barrel 17 can be in contact with the surface of the yarn 4, and the wool absorption effect is enhanced.

When the third piston 20 moves to the limit position, the hydraulic pressure inside the third piston 20 gradually increases, the position of the third piston 20 does not change, and the liquid in the adjusting tube 14 needs to be emptied periodically and reset, which is inconvenient in such an operation that, in order to achieve automatic discharge of the liquid, a third spring 33 is connected between the third piston 20 and the inner wall of the adjusting tube 14, one side of the adjusting tube 14 is provided with a pressure relief mechanism capable of controlling the position of the third piston 20, the pressure relief mechanism comprises a pressure relief tube 21 fixedly connected with one side of the adjusting tube 14, a fourth piston 24 is slidably connected in the pressure relief tube 21, the side wall of the fourth piston 24 is fixedly connected with a trigger rod 25, the tail end of the trigger rod 25 extends into the adjusting tube 14, the adjusting tube 14 is communicated with the pressure relief tube 21 through a liquid outlet tube 22, the part of the liquid outlet tube 22 communicated with the pressure relief tube 21 is located on the other side, when the hydraulic pressure in the adjusting tube 14 gradually increases, the liquid enters the pressure relief pipe 21 to push the fourth piston 24 to move, and then the subsequent liquid discharge is completed.

The side wall of the pressure relief pipe 21 is communicated with a liquid discharge pipe 23, in an initial state, the side wall of the fourth piston 24 shields the liquid discharge pipe 23, at this time, liquid cannot be discharged from the side wall, a pair of clamping plates 26 made of elastic materials is arranged in the pressure relief pipe 21, the first clamping plate 26 is fixedly connected with the pressure relief pipe 21, the second clamping plate 26 is fixedly connected with the trigger rod 25, under the limit of the clamping plates 26, the fourth piston 24 can move only under certain pressure, the pumped liquid firstly pushes the third piston 20 to move, when the internal pressure reaches a rated threshold value, the fourth piston 24 is pushed to move towards the direction of the adjusting pipe 14 under the action of force, at this time, the fourth piston 24 and the liquid discharge pipe 23 are staggered, under the action of a third spring 33, the liquid in the third piston is discharged, the liquid discharge rate of the liquid discharge pipe 23 is greater than that of the first pipeline 18, and the resetting of the third piston 20 is further realized, when the third piston 20 is reset to the initial state, the third piston 20 pushes the trigger rod 25 to reset the fourth piston 24 to shield the drain pipe 23, at this time, the whole body is reset to the initial state, and the yarn pressing drum 17 performs the automatic reciprocating motion of the next round.

In the working process of the invention, in the normal yarn running process of the yarn 4, the driving rod 8 pushes the yarn clamping block 6 on the side wall of the mounting plate 7 to move towards the other yarn clamping block 6 in a reciprocating manner so as to finish the yarn clamping process.

In the process, the second piston 28 is moved towards the direction of the connecting pipe 30 under the action of magnetic force, the driving liquid in the second piston is pumped into the pulling pipe 12 to push the first piston 32 to move, the pulling rod 34 is further driven to move through the rope 35 to drive the first limiting frame 37, the rope 35 is at the end of pulling the first limiting frame 37, the relative position of the yarn pressing barrel 17 connected with the second mounting frame 11 is unchanged, the other yarn pressing barrel 17 moves downwards, the moving process is offset with the yarn 4 to further limit the yarn 4, and the yarn 4 moving process is more accurate and stable.

In addition, in the process, the second motor 13 can drive the yarn pressing drum 17 to rotate through the two belt pulleys 36, and the hair absorbing opening in the surface of the yarn pressing drum 17 can absorb dust and hair on the surface of the yarn 4 under the action of negative pressure, so that the local cleanness of the yarn is ensured.

The first piston 32 can suck the driving liquid through the second pipeline 31 in the process of reciprocating movement and finally discharge the driving liquid into the adjusting pipe 14 through the first pipeline 18, and the third piston 20 is gradually pushed to move in the process, so that the position of the yarn pressing barrel 17 is controlled.

When the third piston 20 moves to the limit position, the pressure inside the third piston 20 is increased by the liquid continuously pumped in at the moment, the high-pressure liquid enters the pressure relief pipe 21 through the liquid outlet pipe 22 to push the fourth piston 24 to move, the liquid outlet pipe 23 is opened after the fourth piston 24 moves, the liquid in the adjusting pipe 14 is extruded out under the action of the third spring 33 at the moment, and then the return movement of the third piston 20 is realized.

When the third piston 20 moves to the initial position in the return stroke, the third piston 20 extrudes the trigger rod 25 at the moment, so that the trigger rod 25 pushes the fourth piston 24 to return to the initial position, the side wall of the fourth piston 24 shields the liquid discharge pipe 23 at the moment, the liquid cannot be discharged at the moment, the first pipeline 18 continuously pumps the liquid, and then the steps are repeatedly completed, the yarn pressing cylinder 17 reciprocates in the rotating process, different positions of the yarn pressing cylinder 17 are in contact with the yarns 4, the adsorption effect on dust and hair on the yarns 4 is further enhanced, and the normal production is ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. The yarn clamping device for the air-jet loom comprises a bottom plate (1) arranged below yarns (4), and is characterized in that the upper end of the bottom plate (1) is fixedly connected with a mounting box (2), the upper end of the bottom plate (1) is fixedly connected with a mounting block (5) positioned on one side of the mounting box (2), one side of the mounting box (2) is provided with a mounting plate (7), the side wall of the mounting plate (7) is fixedly connected with a driving rod (8), the tail end of the driving rod (8) penetrates through the mounting box (2) and extends into the mounting box, the side walls of the mounting plate (7) and the mounting block (5) are both fixedly connected with yarn clamping blocks (6), and a driving mechanism capable of driving the driving rod (8) to move in a reciprocating mode is arranged in the mounting box (2);

bottom plate (1) upper end fixedly connected with first mounting bracket (10) and second mounting bracket (11), install two between first mounting bracket (10) and second mounting bracket (11) and press a yarn section of thick bamboo (17), two press a yarn section of thick bamboo (17) to be located the upper and lower both sides of yarn (4) respectively, be equipped with on bottom plate (1) and drive the yarn pressing mechanism that a yarn pressing section of thick bamboo (17) removed, wherein press yarn mechanism can carry on spacingly to the yarn in the middle of pressing from both sides the process of yarn.

2. The yarn gripper for the air jet loom according to claim 1, wherein the driving mechanism comprises a first motor fixed inside the mounting box (2), the tail end of an output shaft of the first motor is fixedly connected with a cam, the cam is positioned on one side of the driving rod (8) and matched with the driving rod, and a first spring (9) is connected between the mounting plate (7) and the outer wall of the mounting box (2).

3. The yarn gripper for the air-jet loom according to claim 1, wherein the yarn pressing mechanism comprises a first limiting frame (37) positioned on a first side of two yarn pressing drums (17), two sleeves (15) are fixedly connected to the first limiting frame (37), a telescopic rotating shaft (16) is rotatably connected to each sleeve (15), telescopic ends of the two telescopic rotating shafts (16) are fixedly connected to side walls of the two yarn pressing drums (17), a first sleeve (15) is rotatably connected to a second mounting frame (11), a torsion spring is connected between the first limiting frame (37) and the second mounting frame (11), a pulling pipe (12) positioned below the first limiting frame (37) is fixedly connected to the upper end of the bottom plate (1), a first piston (32) is slidably connected to the pulling pipe (12), a pulling rod (34) is fixedly connected to the upper end of the first piston (32), the pull rod (34) end penetrates through the pull pipe (12), the pull rod (34) end is connected with the first limiting frame (37) through a rope (35), and a control mechanism capable of driving the pull rod (34) to move is arranged in the mounting block (5).

4. The yarn gripper for the air-jet loom according to claim 3, characterized in that the control mechanism comprises a control tube (27) embedded inside the mounting block (5), a second piston (28) is slidably connected in the control tube (27), a second spring (29) is connected between the second piston (28) and the inner wall of the control tube (27), the control tube (27) is communicated with the pulling tube (12) through a connecting tube (30), the second piston (28) has magnetism, and a magnet matched with the second piston (28) is embedded in the mounting plate (7).

5. The yarn gripper for air-jet looms as claimed in claim 3, characterized in that the two base ends of said telescopic rotating shaft (16) are fixedly connected with a pulley (36), a belt is sleeved on the two pulleys (36), a second motor (13) is fixedly connected to said second mounting bracket (11), the end of the output shaft of said second motor (13) is fixedly connected with one of said pulleys (36), and said pulley (36) is located on one side of the first sleeve (15).

6. The yarn gripper for the air-jet loom according to claim 1, characterized in that a plurality of hair suction ports are formed on the surface of the yarn pressing drum (17), the hair suction ports are communicated with a negative pressure pipe, and the negative pressure pipe is externally connected with a negative pressure device.

7. The yarn gripper for the air-jet loom according to claim 3, characterized in that an adjusting tube (14) is fixedly connected to the first mounting frame (10), a third piston (20) is slidably connected to the adjusting tube (14), an adjusting rod (19) is fixedly connected to the side wall of the third piston (20), a second limiting frame (38) is installed on the second side of each of the two yarn pressing drums (17), the tail end of the adjusting rod (19) penetrates through the adjusting tube (14) and is rotatably connected with the second limiting frame (38), the pulling tube (12) is communicated with a first pipeline (18) and a second pipeline (31), one-way valves are respectively arranged in the first pipeline (18) and the second pipeline (31), the tail end of the first pipeline (18) is communicated with the adjusting tube (14), and a third spring (33) is connected between the third piston (20) and the inner wall of the adjusting tube (14), and a pressure relief mechanism capable of controlling the position of the third piston (20) is arranged on one side of the adjusting pipe (14).

8. The yarn gripper for the air-jet loom according to claim 7, characterized in that the pressure relief mechanism comprises a pressure relief pipe (21) fixedly connected with one side of the adjusting pipe (14), a fourth piston (24) is slidably connected in the pressure relief pipe (21), a trigger rod (25) is fixedly connected to the side wall of the fourth piston (24), the tail end of the trigger rod (25) extends into the adjusting pipe (14), the adjusting pipe (14) is communicated with the pressure relief pipe (21) through a liquid outlet pipe (22), and a liquid outlet pipe (23) is communicated with the side wall of the pressure relief pipe (21).

9. A yarn gripper for an air-jet loom according to claim 8, characterized in that a pair of clamping plates (26) made of an elastic material is arranged in the pressure release tube (21), a first of the clamping plates (26) is fixedly connected with the pressure release tube (21), and a second of the clamping plates (26) is fixedly connected with the trigger lever (25).