Yarn breakage detection device

Abstract

The present invention relates to the field of textile machinery, and in particular to a yarn break detection device, comprising a mounting seat, a yarn drum mounted on the mounting seat, the mounting seat being fixed to a mounting plate, a line-adjusting portion, a first line wheel, a trigger mechanism and a measuring mechanism being sequentially mounted on the mounting plate, the yarn drum, the line-adjusting portion, the first line wheel and the trigger mechanism being used together for tensioning the yarn wound on the yarn drum, and the trigger mechanism being used for detecting whether the line is broken, the measuring mechanism being used for measuring the line break position after the line is broken, a positioning mechanism being further mounted on the mounting plate, the positioning mechanism being used for signal guidance of the detected line break position. The present invention can detect the line break time and stop the machine in time, predict the line break position by the yarn position when the line is broken, and enable the operator to quickly find the line break position for subsequent operations by signal guidance, thereby saving time, reducing the difficulty of operation, and being convenient and quick.

Description

Technical Field

[0001] The invention relates to the field of textile machinery, and in particular to a yarn breakage detection device. Background Art

[0002] During the high-speed operation of automatic textile machinery, the yarn wound on the yarn bobbin often breaks due to quality or production process problems. Once the yarn breaks, the product is prone to quality defects such as thread derailment and missing thread. Therefore, when the yarn breaks, the machine must be shut down immediately to ensure product quality. However, there is inevitably a delay in the machine shutdown operation through operator observation, which causes cost waste and product quality problems.

[0003] The Chinese patent with authorization announcement number CN202744106U and name "yarn breakage detection device" discloses a yarn breakage detection device, the detection method of which is to use a large number of infrared probes for detection and send the detection signal to the power device to stop it from working. However, it is difficult to detect the breakage signal using the infrared probe, and too many infrared probes will increase the maintenance and production costs of the equipment.

[0004] In addition, after the yarn breaks, it often takes a lot of time for the operator to find the location of the yarn break and rethread the yarn. The above-mentioned public document does not provide a corresponding solution, so the break location cannot be intuitively fed back to the operator in a timely manner. The operator still needs to spend a long time looking for the location of the break, which greatly reduces production efficiency. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a yarn break detection device, which can send a signal to stop the machine at the first time when the yarn breaks, so as to avoid product quality problems and material waste caused by the break without stopping the machine; the device determines the break position of the yarn bobbin according to the direction of the yarn at the moment of breakage, and drives the positioning light to indicate the corresponding position, so as to solve the problem that it is difficult for operators to find the broken thread ends and the operation time is long, which is specifically achieved through the following technical solutions:

[0006] A yarn breakage detection device comprises a mounting seat, which is fixed to a mounting plate, a rotating seat is rotatably mounted on the mounting seat, a brake part is mounted on the side of the rotating seat, and a yarn tube is fixed on the rotating seat.

[0007] The first end of the yarn is wound on the yarn tube, and the second end of the yarn passes through the line-following part in sequence, bypasses the top of the trigger mechanism, bypasses the bottom of the first wire wheel and then enters the textile machine. The line-following part and the first wire wheel are respectively fixed on the mounting plate.

[0008] The trigger mechanism and the measuring mechanism are sequentially mounted on the mounting plate. The trigger mechanism includes a second wheel, which is located above the middle of the line-following portion and the first wheel and is used to tension the yarn. The second wheel is connected to a pressure sensor via an elastic mechanism. The pressure sensor is mounted on the mounting plate and is used to detect whether the line is broken.

[0009] The measuring mechanism comprises a laser transmitter and a laser receiver, the yarn is arranged between the laser transmitter and the laser receiver, and the measuring mechanism can record the shielding state of the yarn to the laser at the moment of breaking.

[0010] A positioning mechanism is installed on the mounting seat. The positioning mechanism includes a motor. The motor is fixed to the mounting seat and can drive the horizontal laser instrument to move up and down.

[0011] The mounting seat is fixed to the controller, and the controller is respectively connected to the pressure sensor, the laser transmitter, the laser receiver, the motor, and the horizontal laser instrument.

[0012] Preferably, the elastic mechanism includes a mounting shaft, the mounting shaft is fixed to the mounting plate, a rotating sleeve is rotatably mounted on the mounting shaft, a torsion spring is surrounded by the rotating sleeve, the first end of the torsion spring is fixed to the mounting shaft, and the second end of the torsion spring is fixed to the rotating sleeve.

[0013] The rotating sleeve is fixed to the first connecting rod, the second wire wheel is rotatably mounted on the first connecting rod, the yarn is passed over the second wire wheel, the first connecting rod is fixedly connected to the trigger plate, the trigger plate can overlap with the pressing pin, the pressing pin is arranged in the guide hole and moves along the guide hole, the guide hole is opened on the mounting shaft, the pressing pin is fixed to the first end of the spring, the second end of the spring is fixed to the pressure sensor, and the pressure sensor is fixed on the mounting shaft.

[0014] Preferably, the measuring mechanism further comprises a front plate, the front plate is fixed to the mounting plate, the laser emitter is mounted on the front plate, the laser emitter is simultaneously connected to a plurality of emission points, and the emission points are mounted on the front plate.

[0015] The front plate is fixed to the rear plate, a plurality of receiving points are installed on the rear plate, the receiving points correspond to the transmitting points one by one, the receiving points are connected to the laser receiver, and the laser receiver is installed on the rear plate.

[0016] Preferably, the output end of the motor is coaxially fixed with the screw, the screw is rotatably mounted on the mounting seat, the screw is threadedly connected to the slider, the slider is provided with a through hole, a guide rod is arranged in the through hole and slides relative to the through hole, the guide rod is fixed to the mounting seat, and the horizontal laser is mounted on the slider.

[0017] Preferably, the line-aligning portion comprises a line-aligning ring and a support rod, two of the line-aligning rings are coaxially fixed via a plurality of the support rods, and the support rods are fixed to the mounting plate.

[0018] Preferably, the brake part comprises a friction belt and a fixing clamp, the two ends of the friction belt are respectively fixedly clamped to hold the fixing clamp, the fixing clamp is fixed to the mounting seat, and the friction belt overlaps the rotating seat.

[0019] Preferably, the trajectory of the trigger plate is in the shape of an arc, and the center of the arc coincides with the axis of the rotating sleeve.

[0020] Preferably, the distance from the center of the pressing pin to the axis of the rotating sleeve is equal to the radius of the trajectory of the trigger plate.

[0021] Preferably, a chamfer is provided on a side of the pressing pin close to the torsion spring and close to the first connecting rod.

[0022] Preferably, the height center of the yarn tube is flush with the height center of the rear plate, and the height center is horizontally aligned with the axis of the line-aligning ring.

[0023] After adopting the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The yarn tension is used as the basis for judging whether the yarn is broken. When the yarn is broken, the machine can be stopped immediately to avoid product quality problems and raw material waste caused by the continued operation of the machine, which is more reliable.

[0025] 2. By measuring the direction of the yarn, the broken position of the yarn tube can be accurately determined with small judgment error and high accuracy.

[0026] 3. Use the positioning mechanism to timely calibrate the broken wire position, which is convenient for operators to find and operate the broken wire ends, thereby greatly reducing the difficulty of operation and reducing the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a front view of the yarn breakage detection device;

[0029] Figure 2 Axonometric diagram of the distribution and installation of components of the yarn breakage detection device;

[0030] Figure 3 for Figure 1 A partial enlarged view of

[0031] Figure 4 for Figure 2 A partial enlarged view of the first part;

[0032] Figure 5 for Figure 2 A partial enlarged view of the second part;

[0033] Figure 6 is a front cross-sectional view of the trigger mechanism;

[0034] Figure 7 Axonometric drawing of the first perspective of the measuring mechanism;

[0035] Figure 8 An axonometric drawing of the second viewing angle of the measuring mechanism;

[0036] Fig. 9 It is a schematic diagram of the working principle of the measuring mechanism;

[0037] Fig.10 for Figure 1 Left view of .

[0038] Description of reference numerals:

[0039] 101-mounting seat, 102-mounting plate, 103-yarn bobbin, 104-yarn, 104a-first yarn, 104b-second yarn, 105-first line wheel, 106-rotating seat, 110-line-adjusting part, 111-line-adjusting ring, 112-support rod, 120-brake part, 121-friction belt, 122-fixing clamp;

[0040] 200-trigger mechanism, 201-installation shaft, 202-rotating sleeve, 203-torsion spring, 204-first connecting rod, 205-second wire wheel, 206-trigger plate, 207-pressing pin, 208-guide hole, 209-spring, 210-pressure sensor;

[0041] 300-measuring mechanism, 301-front plate, 302-laser transmitter, 303-transmitting point, 304-rear plate, 305-receiving point, 305a-first receiving point, 305b-second receiving point, 305c-third receiving point, 306-laser receiver;

[0042] 400-positioning mechanism, 401-motor, 402-screw, 403-slider, 404-guide rod, 405-horizontal laser instrument;

[0043] 500-controller, A-first position, B-second position, C-third position. DETAILED DESCRIPTION

[0044] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0045] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0046] The embodiment of the present invention provides a yarn breakage detection device, see Figure 1-4 The yarn breakage detection device includes a mounting seat 101, a mounting plate 102 is fixedly mounted on the side of the mounting seat 101, a rotating seat 106 is rotatably mounted on the mounting seat 101, a brake portion 120 mounted on the mounting seat 101 is provided on the side of the rotating seat 106, the brake portion 120 is used for braking and decelerating the rotating seat 106, a yarn tube 103 is coaxially fixedly mounted on the rotating seat 106, a first end of the yarn 104 is wound around the yarn tube 103, the second end of the yarn 104 passes through the line-aligning portion 110 in sequence, bypasses the trigger mechanism 200, bypasses the bottom of the first wheel 105 and then enters the textile machine, the line-aligning portion 110 and the first wheel 105 are respectively fixedly mounted on the mounting plate 102.

[0047] The mounting plate 102 is fixedly mounted with a trigger mechanism 200 and a measuring mechanism 300 in sequence from away from the mounting seat 101 to close to the mounting seat 101. The trigger mechanism 200 is located above the middle of the line-following portion 110 and the first wire wheel 105, and is used to tension the yarn 104 and detect whether the thread is broken. The measuring mechanism 300 is used to measure the position of the thread break on the yarn tube 103.

[0048] A positioning mechanism 400 is fixedly mounted on the mounting base 101, and the positioning mechanism 400 includes a motor 401 and a horizontal laser 405. The horizontal laser 405 can emit horizontal laser lines, and the motor 401 can drive the horizontal laser 405 to move to the same horizontal height according to the broken position on the yarn tube 103 measured by the measuring mechanism 300 when the line is broken.

[0049] A controller 500 is fixedly mounted on the front of the mounting base 101 , and the controller 500 is connected to the trigger mechanism 200 , the measuring mechanism 300 , the motor 401 , and the horizontal laser instrument 405 , respectively.

[0050] Among them, the line-aligning part 110 includes a line-aligning ring 111 and a support rod 112. The two line-aligning rings 111 are fixedly connected by a number of support rods 112 evenly distributed in a ring shape. The support rod 112 is fixedly connected to the mounting plate 102. The two line-aligning rings 111 are coaxially arranged, and the line-aligning ring 111 is internally provided with a yarn 104 moving along it. The purpose of this design is to guide the yarn 104 and fix a path point of the yarn 104 to facilitate the measurement of the pointing position of the yarn 104.

[0051] Among them, the brake part 120 includes a friction belt 121 and a fixing clamp 122. The two ends of the friction belt 121 are respectively fixedly clamped with the fixing clamps 122. The fixing clamps 122 are fixedly connected to the mounting seat 101. The side of the friction belt 121 overlaps with the outer surface of the rotating seat 106, and the friction belt 121 is made of rubber. In the present invention, the friction belt 121 is clamped, fixed and tensioned by the two fixing clamps 122. The friction belt 121 is overlapped with the outer surface of the rotating seat 106, so that the rotating seat 106 needs to overcome the sliding friction between the friction belt 121 and the rotating seat 106 when rotating, thereby playing a deceleration and braking role on the rotating seat 106, thereby ensuring the tensioning effect of the yarn 104.

[0052] like Figure 1-4 As shown, in this embodiment, during the textile production process, the yarn 104 flows toward the textile machine under the pulling action, and is gradually unwound from the yarn bobbin 103, thereby driving the synchronous rotation of the yarn bobbin 103 and the rotating seat 106. Due to the overlapping relationship between the rotating seat 106 and the friction belt 121, the sliding friction between the two needs to be overcome during the rotation of the rotating seat 106. Therefore, under the dual action of friction and pulling force, the yarn 104 is always in a tensioned state.

[0053] In addition, the yarn 104 passes through the line-following portion 110 in sequence, bypasses the trigger mechanism 200 and bypasses the first wire wheel 105, so that the tension of the yarn 104 also acts on the trigger mechanism 200. Therefore, once the yarn 104 breaks, the trigger mechanism 200 can detect it in the first time and send a break signal to the controller 500. At this time, the controller 500 controls the measuring mechanism 300 to measure the directional position of the yarn 104 and transmits the measured data to the controller 500. The controller 500 further calculates the break position on the yarn tube 103 based on the measured data, controls the motor 401 to drive the horizontal laser 405 to move to the same horizontal height as the break position, so that the horizontal laser line emitted by the horizontal laser 405 is projected onto the yarn tube 103. The operator finds the broken thread end through the position marked by the laser line, thereby greatly reducing the difficulty of finding and improving work efficiency.

[0054] For further explanation of the present invention, see Figure 5 , Figure 6 The trigger mechanism 200 includes a mounting shaft 201, a rotating sleeve 202, a torsion spring 203, a first connecting rod 204, a second wire wheel 205, a trigger plate 206, a pressing pin 207, a guide hole 208, a spring 209, and a pressure sensor 210. The mounting plate 102 is fixedly connected to the mounting shaft 201, and the rotating sleeve 202 is rotatably mounted on the outer surface of the mounting shaft 201. The outer surface of the rotating sleeve 202 is surrounded by a torsion spring 203. The first end of the torsion spring 203 is fixedly connected to the mounting shaft 201, and the second end of the torsion spring 203 is fixedly connected to the outer surface of the rotating sleeve 202.

[0055] The outer surface of the rotating sleeve 202 is also fixedly connected to the first end of the first connecting rod 204, and the second end of the first connecting rod 204 is rotatably mounted with the second wire wheel 205, and the yarn 104 is wound above the outer surface of the second wire wheel 205. The middle part of the first connecting rod 204 is fixedly connected to the first end of the trigger plate 206, and the second end of the trigger plate 206 can overlap with the first end of the pressing pin 207. The pressing pin 207 is arranged in the guide hole 208 and moves along it. The guide hole 208 is opened on the mounting shaft 201, and the second end of the pressing pin 207 is fixedly connected to the first end of the spring 209. The second end of the spring 209 is fixedly connected to the pressure sensor 210. The pressure sensor 210 is fixedly mounted on the mounting shaft 201, and the pressure sensor 210 is connected to the controller 500.

[0056] Among them, a chamfer is set on the side of the first end of the pressing pin 207 close to the first connecting rod 204. The purpose is that when the second end of the trigger plate 206 begins to overlap with the first end of the pressing pin 207, after setting the chamfer, the trigger plate 206 can more easily push the pressing pin 207 to retract into the guide hole 208, thereby transmitting a pressure signal to the pressure sensor 210.

[0057] Among them, the trajectory shape of the trigger plate 206 is an arc shape, and the center of the trajectory of the trigger plate 206 coincides with the axis of the rotating sleeve 202. In addition, the distance from the center of the pressing pin 207 to the axis of the rotating sleeve 202 is equal to the radius of the trajectory of the trigger plate 206. The purpose of the above design is that when the trigger plate 206 rotates, the trigger plate 206 can smoothly overlap with the pressing pin 207.

[0058] Among them, the cross-sectional shape of the pressing pin 207 is a square, and the cross-sectional shape of the guide hole 208 is a square that matches the cross-sectional shape of the pressing pin 207. The purpose is that the guide hole 208 guides the pressing pin 207 to ensure that the pressing pin 207 can only slide back and forth along the length direction of the guide hole 208.

[0059] Through the above structure, when the yarn 104 does not break, under the action of the pulling force of the yarn 104, the second pulley 205 is subjected to a downward force. At this time, the second pulley 205 drives the first connecting rod 204 and the trigger plate 206 to rotate downward along the axis of the rotating sleeve 202 by a certain angle, and at the same time, a balanced state is reached under the action of the elastic force of the torsion spring 203. At this time, the trigger plate 206 does not overlap with the pressing pin 207.

[0060] When the yarn 104 breaks, the yarn 104 no longer exerts a downward force on the second wheel 205. At this time, the equilibrium state is broken. The second wheel 205, the trigger plate 206, and the first connecting rod 204 rotate upward around the axis of the rotating sleeve 202 under the elastic force of the torsion spring 203. When the second end of the trigger plate 206 rotates to overlap with the first end of the pressing pin 207, under the action of the chamfer of the pressing pin 207, the trigger plate 206 easily squeezes the pressing pin 207 into the guide hole 208, further compressing the spring 209. The spring 209 transmits the elastic force to the pressure sensor 210, and the pressure sensor 210 transmits the disconnection signal to the controller 500. The controller 500 controls the shutdown as soon as it receives the disconnection signal, and drives the measuring mechanism 300 and the positioning mechanism 400 to complete subsequent operations.

[0061] For further explanation of the present invention, see Figure 7 , Figure 8 , Fig. 9The measuring mechanism 300 includes a front plate 301, a laser emitter 302, an emission point 303, a rear plate 304, a receiving point 305, and a laser receiver 306. The front plate 301 is fixedly connected to the mounting plate 102. The laser emitter 302 is fixedly installed on the front plate 301. The laser emitter 302 is connected to the controller 500. The laser emitter 302 is also connected to a plurality of emission points 303 at the same time. The emission points 303 are vertically and evenly arranged along the height direction of the front plate 301. The front plate 301 is fixedly connected to the rear plate 304, and the rear plate 304 is arranged parallel to the front plate 301. The rear plate 304 is evenly arranged with a plurality of receiving points 305 along the height direction. The number of receiving points 305 is equal to that of the emission points 303 and the receiving points 305 correspond to the emission points 303 one by one. The plurality of receiving points 305 are simultaneously connected to the laser receiver 306. The laser receiver 306 is fixedly installed on the rear plate 304 and the laser receiver 306 is connected to the controller 500.

[0062] Each emitting point 303 can emit a laser, each receiving point 305 can receive the laser emitted by the emitting point 303 , the yarn 104 is arranged in the gap between the front plate 301 and the rear plate 304 , and the yarn 104 can partially block the laser emitted by the emitting point 303 .

[0063] Among them, Fig. 9 As shown, the height center of the yarn tube 103 is flush with the height center of the rear plate 304 , and the height center is horizontally aligned with the axis of the thread-aligning ring 111 . The above design facilitates the determination of the thread break position on the yarn tube 103 .

[0064] When the trigger mechanism 200 sends a wire break signal to the controller 500, and the controller 500 controls the measuring mechanism 300 to start working, the position of the yarn 104 has not shifted too much under inertia conditions. At this time, the controller 500 controls the laser transmitter 302 to emit lasers through all the emission points 303. The laser passes through the gap between the front plate 301 and the rear plate 304 and is emitted to each receiving point 305. Each receiving point 305 transmits the receiving signal back to the controller 500 through the laser receiver 306. Since the yarn 104 is arranged between the front plate 301 and the rear plate 304, the yarn 104 will inevitably block part of the laser. Therefore, the controller 500 obtains the position of the yarn 104 when the wire is broken through the difference in laser signals received by each receiving point 305, and determines that the intersection of the extension line of the yarn 104 and the side of the yarn tube 103 is the wire break position, and further drives the horizontal laser instrument 405 to move to the same horizontal height as the wire break position to remind the operator of the wire break position.

[0065] The above determination method is further explained by taking an example. Fig. 9As shown, when the yarn 104 only blocks the signal reception at the first receiving point 305a, the intersection of the extended line of the line connecting the center of the linear ring 111 and the center of the first receiving point 305a and the side of the yarn tube 103 (first position A) is used as the determined broken line position. Similarly, when the yarn 104 only blocks the signal reception at the second receiving point 305b, the second position B is determined to be the broken line position. When the yarn 104 only blocks the signal reception at the third receiving point 305c, the third position C is determined to be the broken line position.

[0066] When the yarn 104 blocks the signal reception of the two receiving points 305 at the same time, as shown in FIG. Fig. 9 As shown in the positions of the first yarn 104a and the second yarn 104b, the first yarn 104a blocks the signal reception of the first receiving point 305a and the second receiving point 305b at the same time. At this time, the middle position between the first position A and the second position B (the intersection position of the extension line of the first yarn 104a and the side of the yarn tube 103) is determined to be the broken position, and the second yarn 104b blocks the signal reception of the second receiving point 305b and the third receiving point 305c at the same time. At this time, the middle position between the second position B and the third position C (the intersection position of the extension line of the second yarn 104b and the side of the yarn tube 103) is determined to be the broken position.

[0067] The controller 500 further controls the motor 401 to drive the horizontal laser 405 to move to the same horizontal height as the broken wire position by determining the broken wire position. At this time, the controller 500 drives the horizontal laser 405 to radiate a horizontal laser line and projects the laser line onto the side of the yarn tube 103, thereby ensuring that the operator can quickly find the broken wire position under the guidance of the laser line.

[0068] As a further explanation of the present invention, Fig.10 , Figure 1 , Figure 2 As shown, the positioning mechanism 400 also includes a screw 402, a slider 403, and a guide rod 404. The output end of the motor 401 is coaxially fixed with the first end of the screw 402. The screw 402 is rotatably mounted on the mounting base 101. The screw 402 is threadedly connected to the slider 403. The slider 403 is provided with a through hole parallel to the length direction of the screw 402. The through hole is provided with a guide rod 404 that can slide relative to the screw 402. The guide rod 404 is fixedly mounted on the mounting base 101, and a horizontal laser 405 is fixedly mounted on the slider 403.

[0069] Among them, those skilled in the art can adjust the pitch of the screw 402 to meet the accuracy requirements when the horizontal laser 405 moves up and down.

[0070] On the basis of the above structure, when the controller 500 drives the screw 402 to rotate through the motor 401, due to the threaded connection relationship between the screw 402 and the slider 403, and the guiding condition of the guide rod 404 to the slider 403, the rotation of the screw 402 drives the slider 403 to reciprocate in the height direction, thereby driving the horizontal laser 405 to reach the same horizontal height for determining the broken wire position, and then the controller 500 controls the horizontal laser 405 to radiate a horizontal laser line, thereby conveniently guiding the operator to find the broken wire position.

[0071] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A yarn breakage detection device, comprising a mounting seat (101), characterized in that: The mounting seat (101) is fixed to the mounting plate (102); a rotating seat (106) is rotatably mounted on the mounting seat (101); a brake portion (120) is mounted on a side of the rotating seat (106); and a yarn bobbin (103) is fixed on the rotating seat (106); The first end of the yarn (104) is wound around the yarn bobbin (103), and the second end of the yarn (104) sequentially passes through the thread-following portion (110), bypasses the top of the trigger mechanism (200), bypasses the bottom of the first thread wheel (105), and then enters the textile machine. The thread-following portion (110) and the first thread wheel (105) are respectively fixed to the mounting plate (102); The trigger mechanism (200) and the measuring mechanism (300) are sequentially mounted on the mounting plate (102); the trigger mechanism (200) comprises a second wire wheel (205); the second wire wheel (205) is located above the middle of the thread-straightening portion (110) and the first wire wheel (105) and is used to tension the yarn (104); the second wire wheel (205) is connected to a pressure sensor (210) via an elastic mechanism; the pressure sensor (210) is mounted on the mounting plate (102); and the pressure sensor (210) is used to detect whether the thread is broken; The measuring mechanism (300) comprises a laser transmitter (302) and a laser receiver (306); the yarn (104) is arranged between the laser transmitter (302) and the laser receiver (306); and the measuring mechanism (300) is capable of recording the shielding state of the yarn (104) against the laser at the moment of breaking; A positioning mechanism (400) is mounted on the mounting seat (101), the positioning mechanism (400) comprising a motor (401), the motor (401) being fixed to the mounting seat (101), and the motor (401) being capable of driving a horizontal laser instrument (405) to move up and down; The mounting seat (101) is fixed to the controller (500), and the controller (500) is respectively connected to the pressure sensor (210), the laser transmitter (302), the laser receiver (306), the motor (401), and the horizontal laser instrument (405); The elastic mechanism comprises a mounting shaft (201), the mounting shaft (201) being fixed to the mounting plate (102), a rotating sleeve (202) being rotatably mounted on the mounting shaft (201), a torsion spring (203) being wound around the rotating sleeve (202), a first end of the torsion spring (203) being fixed to the mounting shaft (201), and a second end of the torsion spring (203) being fixed to the rotating sleeve (202); The rotating sleeve (202) is fixed to the first connecting rod (204); the second wire wheel (205) is rotatably mounted on the first connecting rod (204); the second wire wheel (205) passes over the yarn (104); the first connecting rod (204) is fixedly connected to a trigger plate (206); the trigger plate (206) can overlap with a pressing pin (207); the pressing pin (207) is arranged in a guide hole (208) and moves along the guide hole (208); the guide hole (208) is provided on the mounting shaft (201); the pressing pin (207) is fixed to a first end of a spring (209); the second end of the spring (209) is fixed to the pressure sensor (210); and the pressure sensor (210) is fixed to the mounting shaft (201); The measuring mechanism (300) further comprises a front plate (301), the front plate (301) being fixed to the mounting plate (102), the laser emitter (302) being mounted on the front plate (301), the laser emitter (302) being connected to a plurality of emission points (303) at the same time, and the emission points (303) being mounted on the front plate (301); The front plate (301) is fixed to the rear plate (304); a plurality of receiving points (305) are installed on the rear plate (304); the receiving points (305) correspond to the transmitting points (303) one by one; the receiving points (305) are connected to the laser receiver (306); and the laser receiver (306) is installed on the rear plate (304).

2. The yarn breakage detection device according to claim 1, characterized in that: The output end of the motor (401) is coaxially fixed with the screw rod (402), the screw rod (402) is rotatably mounted on the mounting seat (101), the screw rod (402) is threadedly connected to the slider (403), the slider (403) is provided with a through hole, a guide rod (404) is arranged in the through hole and slides relative to the guide rod (404), the guide rod (404) is fixed to the mounting seat (101), and the horizontal laser instrument (405) is mounted on the slider (403).

3. The yarn breakage detection device according to claim 1, characterized in that: The line-aligning portion (110) comprises a line-aligning ring (111) and a support rod (112); the two line-aligning rings (111) are coaxially fixed via a plurality of support rods (112); and the support rods (112) are fixed to the mounting plate (102).

4. The yarn breakage detection device according to claim 3, characterized in that: The brake part (120) comprises a friction belt (121) and a fixing clamp (122), the fixing clamp (122) being fixedly clamped at both ends of the friction belt (121), the fixing clamp (122) being fixed to the mounting seat (101), and the friction belt (121) being overlapped with the rotating seat (106).

5. The yarn breakage detection device according to claim 1, characterized in that: The trajectory of the trigger plate (206) is in the shape of an arc, and the center of the arc coincides with the axis of the rotating sleeve (202).

6. The yarn breakage detection device according to claim 5, characterized in that: The distance from the center of the pressing pin (207) to the axis of the rotating sleeve (202) is equal to the radius of the trajectory of the trigger plate (206).

7. The yarn breakage detection device according to claim 6, characterized in that: A chamfer is provided on one side of the pressing pin (207) that is close to the torsion spring (203) and close to the first connecting rod (204).

8. The yarn breakage detection device according to claim 4, characterized in that: The height center of the yarn tube (103) is flush with the height center of the rear plate (304), and the height center is horizontally aligned with the axis of the linear ring (111).

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