A glass fiber stitch-bonded fabric pretreatment apparatus

Abstract

The application relates to a glass fiber stitch-bonded fabric pretreatment device, and belongs to the technical field of glass fiber fabric production. The device comprises a pre-thread guiding device, a tensioning device, a broken thread monitoring device and a thread discharging device arranged in sequence. The broken thread monitoring device comprises a monitoring support and an input power supply. An upper contact plate and a lower contact plate are arranged on the monitoring support in an upper-lower opposite mode. A plurality of probes are arranged on the upper contact plate. A first through hole is arranged on the upper contact plate for the probes to pass through. A first thread guiding porcelain eye is arranged on the probe. When the glass fiber passing through the first thread guiding porcelain eye is kept in a tensioning state, the probe is not in contact with the lower contact plate. When the first thread guiding porcelain eye is not passed through by the glass fiber, the probe is in contact with the lower contact plate. The input power supply is connected in series with a relay and is electrically connected between the upper contact plate and the lower contact plate. The output end of the relay is connected with a PLC module loop of a stitch-bonding machine. The application is arranged at the front end of the stitch-bonding machine, can monitor the broken thread of the glass fiber and is favorable for improving the product yield of the glass fiber fabric.

Description

Technical Field

[0001] This application relates to the field of glass fiber fabric production, and in particular to a pretreatment device for glass fiber stitched fabrics. Background Technology

[0002] With the widespread application of fiberglass fabrics, the width of these fabrics is increasing, requiring more and more fiber bundles during production. This leads to fiber tangling, breakage, and missing yarns, directly impacting product quality. Current equipment cannot effectively and promptly arrange the fibers neatly, frequently resulting in yarn tangling and breakage. Furthermore, the sewing machine does not automatically stop after yarn breakage or shortages, relying entirely on manual inspections to check for missing yarns, making effective quality control impossible. Summary of the Invention

[0003] In order to facilitate the timely detection of yarn breakage and effectively improve product yield, this application provides a pretreatment device for glass fiber sewn fabric.

[0004] This application provides a pretreatment device for fiberglass sewn-woven fabrics, which adopts the following technical solution:

[0005] A pretreatment device for fiberglass sewn fabric includes a pre-guided yarn device, a tensioning device, a yarn breakage monitoring device, and a yarn discharge device arranged sequentially. The yarn breakage monitoring device includes a monitoring bracket and an input power supply. The monitoring bracket is provided with an upper contact plate and a lower contact plate, which are arranged opposite each other. A plurality of probes are passed through the upper contact plate, and the upper contact plate has a first through hole for the probes to pass through. The probes have a first yarn guide ceramic eye. When the fiberglass passing through the first yarn guide ceramic eye is kept taut, the probe does not contact the lower contact plate. When no fiberglass passes through the first yarn guide ceramic eye, the probe contacts the lower contact plate. The input power supply is connected in series with a relay and electrically connected between the upper and lower contact plates. The output terminal of the relay is connected to the PLC module circuit of the sewn fabric machine.

[0006] By adopting the above technical solution, glass fiber is fed from the yarn bobbin and sequentially passes through a pre-guided yarn device, a tensioning device, a yarn breakage monitoring device, and a yarn discharge device before entering the sewing machine for stitching. Specifically, when the glass fiber moves towards the yarn breakage monitoring device after passing the tensioning device, if the glass fiber is intact, the probe remains in a high position; if a yarn breakage occurs, the glass fiber loses tension and relaxes, causing the probe to fall and contact the lower contact plate. This activates the relay input, opening the control switch and stopping the sewing machine's PLC module. By using a drop-type probe to contact the lower contact plate and link the control to the sewing machine's PLC module, the timeliness of power-off shutdown in case of yarn breakage is improved. By placing this pretreatment device at the front end of the sewing machine, yarn breakage detection can be performed before the glass fiber enters the machine, which helps improve the product yield of glass fiber fabrics.

[0007] Optionally, the pre-guided yarn device includes a yarn guide bracket and a plurality of second yarn guide ceramic eyes disposed on the yarn guide bracket, wherein the plurality of second yarn guide ceramic eyes are arranged in a straight line along the length direction of the yarn guide bracket.

[0008] By adopting the above technical solution, the movement path of the glass fiber is guided by the second guide eye, which facilitates the smooth introduction of the glass fiber into the tensioning device.

[0009] Optionally, the tensioning device includes a tensioning bracket and a plurality of tensioning components disposed on the tensioning bracket. The tensioning components include two springs, which are vertically arranged and gradually approach each other from one end near the pre-guided yarn device to the other end near the yarn breakage monitoring device.

[0010] By adopting the above technical solution, when the glass fiber passes through the tensioning component, the springs on both sides of the glass fiber squeeze and clamp the passing glass fiber, thereby making it easier for the glass fiber to be in a taut state and achieving the purpose of tensioning the glass fiber.

[0011] Optionally, the tensioning assembly further includes a mounting frame and a first front guide yarn eye and a first rear guide yarn eye disposed on the mounting frame. The mounting frame is disposed on the tensioning bracket, and the spring is mounted on the mounting frame through a positioning assembly. The two springs are disposed between the first front guide yarn eye and the first rear guide yarn eye.

[0012] By adopting the above technical solution, the setting of the first front guide yarn ceramic eye and the first rear guide yarn ceramic eye ensures that the glass fiber can smoothly enter between the two springs, reducing the possibility of the glass fiber detaching from between the springs and causing insufficient tension of the glass fiber.

[0013] Optionally, the positioning component includes a fixed post and a threaded post disposed on the fixed post. The spring is fixed to the fixed post by screws. The mounting bracket is provided with a second through hole for the threaded post to pass through. A locking nut is threaded onto the threaded post.

[0014] By adopting the above technical solution, the spring and the mounting bracket are detachably connected, facilitating the replacement and installation of the spring when it is severely worn. Furthermore, the mutual tilt angle of the two springs can be adjusted according to the fiber thickness of the fiber, thereby adjusting the fiber tension; the larger the mutual tilt angle, the higher the fiber tension. To adjust the mutual tilt angle of the two springs, simply loosen the locking nut and rotate the fixing post a certain angle according to the required fiber tension. After adjustment, tighten the locking nut to secure the fixing post to the mounting bracket. The adjustment is convenient and quick.

[0015] Optionally, the yarn feeding device includes a yarn feeding bracket and a yarn feeder mounted on the yarn feeding bracket. The yarn feeding bracket is provided with a guide roller for guiding the glass fiber after it has been fed by the yarn feeder into the sewing machine. The guide roller is rotatably connected to the yarn feeding bracket. The yarn feeding bracket is also provided with a plurality of third guide ceramic eyes. The third guide ceramic eyes are located on the side of the yarn feeder near the yarn breakage monitoring device.

[0016] By adopting the above technical solution, the glass fiber led out from the yarn breakage monitoring device is introduced into the yarn arranger using the third yarn guide ceramic eye. The yarn arranger arranges the glass fiber before it enters the sewing machine, which makes it easier to arrange the glass fiber neatly and improves the product yield.

[0017] Optionally, the monitoring bracket is provided with a plurality of correspondingly arranged second front guide yarn ceramic eyes and second rear guide yarn ceramic eyes, and the first guide yarn ceramic eye is correspondingly arranged between the second front guide yarn ceramic eyes and the second rear guide yarn ceramic eyes.

[0018] By adopting the above technical solution, the setting of the second front guide yarn ceramic eye and the second rear guide yarn ceramic eye ensures that the glass fiber can pass smoothly through the first guide yarn ceramic eye, and the first guide yarn ceramic eye is suspended by the tensioned glass fiber. The glass fiber passing through the first guide yarn ceramic eye is simultaneously subjected to the downward pressure of the first guide yarn ceramic eye. The second front guide yarn ceramic eye and the second rear guide yarn ceramic eye can support both sides of the glass fiber pressure section, reducing the up-and-down swaying amplitude of the glass fiber when passing through the first guide yarn ceramic eye.

[0019] Optionally, the lower end of the probe is provided with a cone, and the lower contact plate is provided with a cone hole adapted to the cone, the cone hole penetrating the lower contact plate.

[0020] By adopting the above technical solution, the cone head is guided through the conical hole, ensuring stable and reliable contact between the probe and the lower contact plate. Furthermore, after the cone head fits against the wall of the conical hole, the probe and the lower contact plate make surface contact, resulting in lower and more stable contact resistance at the contact point. This reduces the possibility of poor contact between the probe and the lower contact plate, thereby improving the stability of the relay's control over the sewing machine.

[0021] Optionally, the probe has a microchannel extending downward to the lower end of the cone, and the microchannel is connected to a flexible tube, with an air compressor connected to the end of the flexible tube away from the microchannel.

[0022] By employing the above technical solution, compressed air generated by the air compressor is transmitted to the micro-cavity via a flexible hose, and then output from the lower end of the cone head through the micro-cavity. Since the cone head is directly opposite the cone hole below, the high-pressure airflow ejected from the lower opening of the micro-cavity can blow away the inner wall of the cone hole, achieving targeted cleaning of the lower contact plate. This removes dust adhering to the inner wall of the cone hole, ensuring its cleanliness and further reducing the possibility of poor contact between the probe and the lower contact plate. Furthermore, by directional cleaning of the cone hole, it is not necessary to ensure complete cleaning of the lower contact plate, reducing the difficulty of cleaning.

[0023] Optionally, the first guide eye is provided with an annular cavity, and the inner wall of the first guide eye is provided with a plurality of micro-spray holes. The micro-spray holes are connected to the cavity, and the micro-cavity extends upward into the cavity. The output end of the air compressor is connected to a negative ion generator, and the output end of the negative ion generator is connected to the end of the hose away from the micro-cavity.

[0024] By adopting the above technical solution, the high-pressure airflow generated by the air compressor is introduced into the negative ion generator. The negative ion generator converts the high-pressure airflow into a negative ion airflow. The negative ion airflow enters the micro-cavity through a hose and flows along the micro-cavity. Part of it flows upward and is ejected from the lower end of the cone to achieve directional cleaning of the inner wall of the cone hole; the other part flows upward and enters the cavity and is ejected through the micro-spray holes. The micro-spray holes are set on the outside of the glass fiber. When the glass fiber passes through the tensioning device and two springs, it rubs against the springs, thereby generating static electricity. Compared with metal materials, glass fiber has a higher triboelectric polarity. The negative ion airflow removes the static electricity of the glass fiber, avoiding phenomena such as flying yarn, tangling, and knotting caused by static electricity in subsequent production. It is also less likely to attract dust from the air, which is beneficial to improving the production and appearance quality of the product.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. By configuring a probe, a first guide eye, an upper contact plate, a lower contact plate, an input power supply, and a relay, when the glass fiber moves towards the yarn breakage monitoring device after passing through the tensioning device, if the glass fiber is intact, the probe remains in a high position; if a yarn breakage occurs, the glass fiber loses tension and relaxes, causing the probe to fall and contact the lower contact plate. This connects the input power to the relay, causing the relay to activate and disconnect the control switch, thus stopping the PLC module of the sewing machine. The drop-type probe's contact with the lower contact plate and the linkage control of the sewing machine's PLC module improves the timeliness of power-off shutdown in case of yarn breakage. By placing this pretreatment device at the front end of the sewing machine, yarn breakage detection can be performed before the glass fiber enters the machine, which helps improve the product yield of glass fiber fabrics.

[0027] 2. The positioning component allows for a detachable connection between the spring and the mounting bracket, facilitating replacement and installation when the spring is severely worn. Furthermore, the mutual tilt angle of the two springs can be adjusted according to the fiber thickness of the fiber, thereby regulating the fiber tension. A larger tilt angle results in higher fiber tension. Adjusting the mutual tilt angle is simple: loosen the locking nut and rotate the fixing post a certain angle according to the required fiber tension. After adjustment, tighten the locking nut to secure the fixing post to the mounting bracket. The adjustment is quick and easy.

[0028] 3. Through the arrangement of the conical bore, micro-channel, hose, and air compressor, compressed air generated by the air compressor is transmitted to the micro-channel via the hose, and then output from the lower end of the conical head through the micro-channel. Since the conical head is directly facing the conical bore below, the high-pressure airflow ejected from the lower opening of the micro-channel can blow away the inner wall of the conical bore, achieving targeted cleaning of the lower contact plate. This blows off the dust adhering to the inner wall of the conical bore, ensuring its cleanliness and further reducing the possibility of poor contact between the probe and the lower contact plate. In addition, by directional cleaning of the conical bore, it is not necessary to ensure the complete cleaning of the lower contact plate, reducing the cleaning difficulty.

[0029] 4. By setting up a negative ion generator, cavity, and micro-spray holes, the negative ion generator converts high-pressure airflow into negative ion airflow. The negative ion airflow enters the micro-cavity through a hose and flows along the micro-cavity. Part of it flows upward and is sprayed out from the lower end of the cone to achieve directional cleaning of the inner wall of the cone hole; the other part flows upward and enters the cavity and is sprayed out through the micro-spray holes. The negative ion airflow removes static electricity from the glass fiber, avoiding phenomena such as flying yarn, tangling, and knotting caused by static electricity in subsequent production. It is also less likely to attract dust from the air, which is beneficial to improving the production and appearance quality of the product. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0031] Figure 2 This is a schematic diagram illustrating the structure of the tensioning device in Embodiment 1 of this application.

[0032] Figure 3 This is a schematic diagram illustrating the structure of the tensioning component and the positioning component in Embodiment 1 of this application.

[0033] Figure 4 yes Figure 3 Sectional view at point AA.

[0034] Figure 5 This is a structural schematic diagram illustrating one perspective of the yarn breakage monitoring device in Embodiment 1 of this application.

[0035] Figure 6 This is a structural schematic diagram illustrating the yarn breakage monitoring device of Embodiment 1 of this application from another perspective.

[0036] Figure 7 This is a circuit control diagram illustrating the working principle of the yarn breakage monitoring device in Embodiment 1 of this application.

[0037] Figure 8 This is a schematic diagram illustrating the structure of the yarn feeding device in Embodiment 1 of this application.

[0038] Figure 9 This is a cross-sectional view illustrating the internal structure of the probe and the first guide yarn ceramic eye in Embodiment 2 of this application.

[0039] Figure 10 This is a cross-sectional view illustrating the structure of the lower contact plate in Embodiment 2 of this application.

[0040] Figure 11 This is a schematic diagram illustrating the connection relationship between the air compressor and the negative ion generator in Embodiment 2 of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Pre-guided yarn device; 11. Yarn guide bracket; 12. Second yarn guide eye; 2. Tensioning device; 21. Tensioning bracket; 211. Crossbeam; 212. U-bolt; 22. Tensioning assembly; 221. Spring; 2211. Screw; 222. Mounting bracket; 2221. Second perforation; 223. First front yarn guide eye; 224. First rear yarn guide eye; 23. Positioning assembly; 231. Fixing post; 2311. Positioning pin; 232. Threaded post; 233. Locking nut; 234. First washer; 235. Second washer; 3. Yarn breakage monitoring device; 31. Monitoring bracket 311. Second front guide yarn ceramic eye; 312. Second rear guide yarn ceramic eye; 32. Input power supply; 33. Upper contact plate; 331. First through hole; 34. Lower contact plate; 341. Conical hole; 35. Fixing plate; 36. Probe; 361. Conical head; 362. Micro-cavity; 363. Flexible tube; 37. First guide yarn ceramic eye; 371. Cavity; 372. Micro-spray hole; 38. Relay; 381. Switch; 4. Yarn feeding device; 41. Yarn feeding bracket; 411. Guide roller; 412. Third guide yarn ceramic eye; 42. Yarn feeder; 5. Yarn bobbin; 6. PLC module; 7. Air compressor; 8. Negative ion generator. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail below.

[0043] Example 1:

[0044] Embodiment 1 of this application discloses a pretreatment device for glass fiber sewn fabrics. (Refer to...) Figure 1 A pretreatment device for fiberglass sewn fabric includes a pre-guided yarn device 1, a tensioning device 2, a yarn breakage monitoring device 3, and a yarn arrangement device 4 arranged sequentially. The pre-guided yarn device 1 guides the fiberglass drawn from the yarn bobbin 5; the tensioning device 2 tensions the fiberglass; the yarn breakage monitoring device 3 monitors for yarn breaks, allowing operators to promptly identify and reconnect broken yarns; and the yarn arrangement device 4 arranges the fiberglass, improving the production quality of the subsequent sewing machine.

[0045] Reference Figure 1 The pre-guided yarn device 1 includes a yarn guide bracket 11 and a plurality of second yarn guide ceramic eyes 12 mounted on the yarn guide bracket 11. The plurality of second yarn guide ceramic eyes 12 are arranged in a straight line along the length direction of the yarn guide bracket 11. In this embodiment, the plurality of second yarn guide ceramic eyes 12 are arranged at equal intervals. The second yarn guide ceramic eyes 12 guide the movement path of the glass fiber, making it easier to smoothly introduce the glass fiber into the tensioning device 2.

[0046] Reference Figure 1-4The tensioning device 2 includes a tensioning bracket 21 and several tensioning components 22 mounted on the tensioning bracket 21. Each tensioning component 22 includes two springs 221, which are vertically arranged and gradually move from one end near the pre-guided yarn device 1 towards the end near the yarn breakage monitoring device 3. When the glass fiber passes through the tensioning component 22, the springs 221 on both sides of the glass fiber compress and clamp it, thus ensuring the glass fiber is taut and achieving the purpose of tensioning the glass fiber.

[0047] Reference Figure 2-4 The tensioning assembly 22 also includes a mounting frame 222 and a first front guide yarn ceramic eye 223 and a first rear guide yarn ceramic eye 224 mounted on the mounting frame 222. A crossbeam 211 is fixed to the upper side wall of the tensioning bracket 21. The mounting frame 222 is fixed to the crossbeam 211 by U-bolts 212. The mounting frame 222 is arranged in an inverted U-shape. The first front guide yarn ceramic eye 223 is fixed to the side of the mounting frame 222 near the pre-guide yarn device 1. The first rear guide yarn ceramic eye 224 is fixed to the side of the mounting frame 222 near the yarn breakage monitoring device 3. The spring 221 is mounted on the mounting frame 222 by the positioning assembly 23. The two springs 221 are located between the first front guide yarn ceramic eye 223 and the first rear guide yarn ceramic eye 224. By setting the first front guide yarn ceramic eye 223 and the first rear guide yarn ceramic eye 224, it is ensured that the glass fiber can smoothly enter between the two springs 221, reducing the possibility of the glass fiber detaching from between the springs 221 and causing insufficient tension of the glass fiber.

[0048] Reference Figure 3-4 The positioning component 23 includes a fixed post 231 and a threaded post 232 fixed to the upper end of the fixed post 231. A spring 221 is fixed to the fixed post 231 by a screw 2211. A second through hole 2221 is provided on the mounting bracket 222 for the threaded post 232 to pass through. A locking nut 233 is threaded onto the threaded post 232. A first washer 234 is fitted between the locking nut 233 and the outer side of the top wall of the mounting bracket 222. A positioning pin 2311 is fixed to the side wall of the fixed post 231, and a second washer 235 is fitted between the positioning pin 2311 and the inner side of the top wall of the mounting bracket 222. Thus, the spring 221 is detachably connected to the mounting bracket 222, facilitating the replacement and installation of the spring 221 when it is severely worn. Furthermore, the mutual tilt angle of the two springs 221 can be adjusted according to the fiber thickness of the glass fiber, thereby adjusting the tension of the glass fiber. The larger the mutual tilt angle, the higher the tension of the glass fiber. When adjusting the mutual tilt angle of the two springs 221, simply loosen the locking nut 233 and turn the positioning pin 2311 to rotate the fixing post 231 by a certain angle according to the required glass fiber tension. After the adjustment is completed, tighten the locking nut 233 to fix the fixing post 231 to the mounting bracket 222. The adjustment is convenient and quick.

[0049] Reference Figure 5-7The yarn breakage monitoring device 3 includes a monitoring bracket 31 and an input power supply 32. An upper contact plate 33 and a lower contact plate 34 are mounted on the monitoring bracket 31. The upper contact plate 33 and the lower contact plate 34 are arranged vertically opposite each other and are both along the length of the monitoring bracket 31. Both ends of the upper contact plate 33 and the lower contact plate 34 are fixed by fixing plates 35. The fixing plates 35 are made of insulating material, and one of the fixing plates 35 is fixed to the monitoring bracket 31 by bolts. In this embodiment, the fixing plate 35 is made of polytetrafluoroethylene. A plurality of probes 36 are inserted through the upper contact plate 33, and the probes 36 are evenly spaced along the length of the upper contact plate 33. A first through hole 331 is opened on the upper contact plate 33 for the probes 36 to pass through. A first yarn guide ceramic eye 37 is fixed to the upper end of each probe 36. When the glass fiber passing through the first guide eye 37 remains taut, the probe 36 does not contact the lower contact plate 34; when no glass fiber passes through the first guide eye 37, the probe 36 contacts the lower contact plate 34. The input power supply 32 is connected in series with a relay 38 and electrically connected between the upper contact plate 33 and the lower contact plate 34. The output terminal of the relay 38 is connected to the PLC module 6 circuit of the sewing machine. In this embodiment, the input power supply voltage is 24V.

[0050] When the glass fiber moves towards the yarn breakage monitoring device 3 after passing through the tensioning device 2, if the glass fiber is intact, the probe 36 remains in a high position; if a yarn breakage occurs, the glass fiber will lose tension and relax, the probe 36 will fall and contact the lower contact plate 34, thereby connecting the input power supply 32 to the input terminal of the relay 38. The relay 38 then starts working, causing the switch 381 on its own control terminal to open, thereby stopping the PLC module 6 of the sewing machine. By using the drop-type probe 36 to contact and link with the lower contact plate 34 to control the PLC module 6 of the sewing machine, the timeliness of power-off shutdown of the sewing machine in case of yarn breakage is improved. By setting this pretreatment device at the front end of the sewing machine, yarn breakage can be detected in time before the glass fiber enters the sewing machine, which is beneficial to improving the product yield of glass fiber fabrics.

[0051] Reference Figure 5-6 The monitoring bracket 31 is also equipped with several correspondingly arranged second front guide yarn ceramic eyes 311 and second rear guide yarn ceramic eyes 312, with a first guide yarn ceramic eye 37 correspondingly arranged between the second front guide yarn ceramic eyes 311 and the second rear guide yarn ceramic eyes 312. The arrangement of the second front guide yarn ceramic eyes 311 and the second rear guide yarn ceramic eyes 312 ensures that the glass fiber can smoothly pass through the first guide yarn ceramic eye 37, and the first guide yarn ceramic eye 37 is suspended by the tensioned glass fiber. The glass fiber passing through the first guide yarn ceramic eye 37 is simultaneously subjected to downward pressure from the first guide yarn ceramic eye 37. The second front guide yarn ceramic eyes 311 and the second rear guide yarn ceramic eyes 312 can support both sides of the glass fiber under pressure, reducing the vertical swaying amplitude of the glass fiber when passing through the first guide yarn ceramic eye 37.

[0052] Reference Figure 1The yarn feeding device 4 includes a yarn feeding bracket 41 and a yarn feeder 42 mounted on the yarn feeding bracket 41. A guide roller 411 is installed on the yarn feeding bracket 41 to guide the glass fiber fed by the yarn feeder 42 into the sewing machine. The guide roller 411 is rotatably connected to the yarn feeding bracket 41. Several third guide ceramic eyes 412 are also installed on the yarn feeding bracket 41, located on the side of the yarn feeder 42 closest to the yarn breakage monitoring device 3. Thus, the glass fiber drawn from the yarn breakage monitoring device 3 is guided into the yarn feeder 42 using the third guide ceramic eyes 412. The yarn feeder 42 then feeds the glass fiber before it enters the sewing machine, facilitating neat fiber fiber arrangement and improving product yield.

[0053] The implementation principle of the glass fiber sewn fabric pretreatment equipment in this application embodiment is as follows: The equipment is installed at the front end of the sewing machine. When the equipment is working, the glass fiber is fed from the yarn tube 5 and passes through the pre-guided yarn device 1, tensioning device 2, yarn breakage monitoring device 3, and yarn discharge device 4 in sequence before entering the sewing machine for sewing. When the glass fiber moves towards the yarn breakage monitoring device 3 after passing through the tensioning device 2, if the glass fiber is intact, the probe 36 remains in a high position; if a yarn breakage occurs, the glass fiber will lose tension and relax, the probe 36 will fall and contact the lower contact plate 34, thereby connecting the input power supply 32 to the input terminal of the relay 38, and the relay 38 starts to work, causing the switch 381 of the control terminal to open, thereby stopping the PLC module 6 of the sewing machine. The PLC module 6 of the sewing machine is controlled by contacting the drop probe 36 and the lower contact plate 34 to improve the timeliness of power-off shutdown of the sewing machine when yarn breakage occurs. By setting this pretreatment device at the front end of the sewing machine, yarn breakage can be detected in time before the glass fiber enters the sewing machine, which is conducive to improving the product yield of glass fiber fabric.

[0054] Example 2:

[0055] Embodiment 2 of this application discloses a pretreatment apparatus for glass fiber sewn fabrics. (Refer to...) Figure 9-10 The difference between this second embodiment and the first embodiment is that the lower end of the probe 36 is integrally formed with a cone head 361, which is frustoconical in shape. A conical hole 341, adapted to the cone head 361, is provided on the lower contact plate 34, and the conical hole 341 extends through the lower contact plate 34. The cone head 361 is guided by the conical hole 341, ensuring stable and reliable contact between the probe 36 and the lower contact plate 34. Furthermore, after the cone head 361 fits against the wall of the conical hole 341, the probe 36 and the lower contact plate 34 make surface contact, resulting in a smaller and more stable contact resistance at the contact point. This reduces the possibility of poor contact between the probe 36 and the lower contact plate 34, thereby improving the stability of the relay 38's control over the sewing machine.

[0056] Reference Figure 9 and Figure 11The probe 36 has a micro-cavity 362 extending downwards to the lower end of the cone 361. A flexible hose 363 is connected to the side wall of the probe 36, with one end of the hose connected to the micro-cavity 362 and the other end connected to an air compressor 7. Compressed air generated by the air compressor 7 is transmitted to the micro-cavity 362 via the hose 363, and then output from the lower end of the cone 361 through the micro-cavity 362. Since the cone 361 is directly facing the cone hole 341 below, the high-pressure airflow ejected from the lower opening of the micro-cavity 362 can blow away the inner wall of the cone hole 341, achieving targeted cleaning of the lower contact plate 34. This blows away dust adhering to the inner wall of the cone hole 341, ensuring the cleanliness of the inner wall of the cone hole 341 and further reducing the possibility of poor contact between the probe 36 and the lower contact plate 34. In addition, by directional cleaning of the cone hole 341, it is not necessary to ensure the complete cleaning of the lower contact plate 34, reducing the cleaning difficulty.

[0057] Reference Figure 9 and Figure 11 An annular cavity 371 is formed within the first guide eye 37. Several micro-spray holes 372 are formed on the inner wall of the first guide eye 37, arranged in a circular array along the circumference of the eye. The micro-spray holes 372 communicate with the cavity 371. A micro-channel 362 extends upwards into the cavity 371. A negative ion generator 8 is connected to the output end of the air compressor 7. The output end of the negative ion generator 8 is connected to the end of the flexible hose 363 furthest from the micro-channel 362.

[0058] When using this equipment, the high-pressure airflow generated by the air compressor 7 is introduced into the negative ion generator 8. The negative ion generator 8 converts the high-pressure airflow into a negative ion airflow. The negative ion airflow enters the micro-cavity 362 through the hose 363 and flows along the micro-cavity 362. Part of it flows upward and is sprayed out from the lower end of the cone head 361 to achieve directional cleaning of the inner wall of the cone hole 341. The other part flows upward and enters the cavity 371 and is sprayed out through the micro-spray hole 372. The micro-spray hole 372 is set on the outside of the glass fiber. When the glass fiber passes through the tensioning device 2 and passes through the two springs 221, it rubs against the springs 221, thereby generating static electricity. Compared with metal materials, glass fiber has a higher triboelectric polarity. The negative ion airflow removes the static electricity of the glass fiber, avoiding phenomena such as flying yarn, tangling, and knotting caused by static electricity in subsequent production. It is also less likely to adhere to dust in the air, which is beneficial to improving the production and appearance quality of the product.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pretreatment device for glass fiber sewn fabric, characterized in that: The device includes a pre-guided yarn device (1), a tensioning device (2), a yarn breakage monitoring device (3), and a yarn discharge device (4) arranged sequentially. The yarn breakage monitoring device (3) includes a monitoring bracket (31) and an input power supply (32). The monitoring bracket (31) is provided with an upper contact plate (33) and a lower contact plate (34), which are arranged opposite each other. Several probes (36) are inserted through the upper contact plate (33), and the upper contact plate (33) is provided with a first through hole (331) through which the probes (36) pass. The probe (36) is provided with a first yarn guide ceramic eye (37). When the glass fiber passing through the first yarn guide ceramic eye (37) is kept taut, the probe (36) does not contact the lower contact plate (34). When no glass fiber passes through the first yarn guide ceramic eye (37), the probe (36) contacts the lower contact plate (34). The input power supply (32) is connected in series with a relay (38) and electrically connected between the upper contact plate (33) and the lower contact plate (34). The output terminal of the relay (38) is connected to the PLC module (6) circuit of the sewing machine. The lower end of the probe (36) is provided with a cone (361), and the lower contact plate (34) is provided with a cone hole (341) that is adapted to the cone (361), and the cone hole (341) passes through the lower contact plate (34). The probe (36) is provided with a micro-cavity (362), which extends downward to the lower end of the cone (361). The micro-cavity (362) is connected to a flexible tube (363), and the end of the flexible tube (363) away from the micro-cavity (362) is connected to an air compressor (7). The first yarn guide ceramic eye (37) is provided with an annular cavity (371). The inner wall of the eye hole of the first yarn guide ceramic eye (37) is provided with a plurality of micro-spray holes (372). The micro-spray holes (372) are connected to the cavity (371). The micro-cavity channel (362) extends upward into the cavity (371). The output end of the air compressor (7) is connected to a negative ion generator (8). The output end of the negative ion generator (8) is connected to the end of the hose (363) away from the micro-cavity channel (362).

2. The glass fiber sewn fabric pretreatment equipment according to claim 1, characterized in that: The pre-guided yarn device (1) includes a yarn guide bracket (11) and a plurality of second yarn guide ceramic eyes (12) provided on the yarn guide bracket (11). The plurality of second yarn guide ceramic eyes (12) are arranged in a straight line along the length direction of the yarn guide bracket (11).

3. The glass fiber sewn fabric pretreatment equipment according to claim 1, characterized in that: The tensioning device (2) includes a tensioning bracket (21) and a plurality of tensioning components (22) disposed on the tensioning bracket (21). The tensioning component (22) includes two springs (221), which are vertically arranged and gradually arranged from one end near the pre-guided yarn device (1) to the end near the yarn breakage monitoring device (3).

4. The glass fiber sewn fabric pretreatment equipment according to claim 3, characterized in that: The tensioning assembly (22) further includes a mounting frame (222) and a first front guide yarn eyelet (223) and a first rear guide yarn eyelet (224) disposed on the mounting frame (222). The mounting frame (222) is disposed on the tensioning bracket (21). The spring (221) is mounted on the mounting frame (222) through the positioning assembly (23). The two springs (221) are disposed between the first front guide yarn eyelet (223) and the first rear guide yarn eyelet (224).

5. The glass fiber sewn fabric pretreatment equipment according to claim 4, characterized in that: The positioning component (23) includes a fixed post (231) and a threaded post (232) provided on the fixed post (231). The spring (221) is fixed to the fixed post (231) by a screw (2211). The mounting bracket (222) is provided with a second through hole (2221) for the threaded post (232) to pass through. A locking nut (233) is threaded onto the threaded post (232).

6. The glass fiber sewn fabric pretreatment equipment according to claim 1, characterized in that: The yarn feeding device (4) includes a yarn feeding bracket (41) and a yarn feeder (42) provided on the yarn feeding bracket (41). The yarn feeding bracket (41) is provided with a guide roller (411) for introducing the glass fiber after being fed by the yarn feeder (42) into the sewing machine. The guide roller (411) is rotatably connected to the yarn feeding bracket (41). The yarn feeding bracket (41) is also provided with a plurality of third guide ceramic eyes (412). The third guide ceramic eyes (412) are located on the side of the yarn feeder (42) near the yarn breakage monitoring device (3).

7. The glass fiber sewn fabric pretreatment equipment according to claim 1, characterized in that: The monitoring bracket (31) is provided with a plurality of corresponding second front guide yarn ceramic eyes (311) and second rear guide yarn ceramic eyes (312), and the first guide yarn ceramic eye (37) is correspondingly arranged between the second front guide yarn ceramic eyes (311) and the second rear guide yarn ceramic eyes (312).

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