A light eye sensing device and sensing method for a doffer shaft of a doffer

Abstract

The application discloses a light eye sensing device and sensing method of a doffer shaft of a doffer, comprising a doffer, which is arranged beside a winding machine, a track arranged in front of the winding machine, and a doffing station at the end of the track; the winding machine comprises a plurality of winding positions, each of which is equipped with an independent silk cake pushing mechanism and a winding shaft, and the silk cake pushing mechanism pushes the silk cake after winding along the winding shaft to the doffer shaft of the doffer; the doffer comprises a frame capable of walking along the track, a silk seat, a doffer shaft, a light eye sensing device, a signal processor and an executing mechanism, the tail end of the doffer shaft is fixedly connected with the silk seat, the silk seat is arranged in the frame in an extendable manner, and the executing mechanism comprises a walking driving mechanism, a lifting driving mechanism and an extending driving mechanism. After the application is implemented, the damage rate of the light eye sensing device is reduced, the light eye sensing device no longer directly contacts with foreign matters, the service life is greatly prolonged, the stability and safety of equipment operation are higher, and the production efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of polyester filament production equipment, specifically to a photoelectric sensor device and sensing method for the doffing shaft of a doffing machine. Background Technology

[0002] Currently, our company relies on a fully automatic doffing machine to complete the winding of the yarn package. The winding operators are mainly responsible for maintaining the normal operation of the doffing machine and loading paper tubes, so the number of personnel is generally quite limited. If the automatic doffing machine malfunctions or alarms, it is difficult for the winding operators to detect and resolve the problem immediately, leading to a decrease in the doffing machine's efficiency and affecting normal production. The photoelectric alarm on one doffing shaft is particularly problematic. 1. Under normal circumstances (see attached...) Figure 8 1. After the pusher plate of the winding machine completely pushes the yarn cake onto the doffing shaft of the doffing machine, the shaft returns to its original position. With the photoelectric sensor at the top of the doffing shaft unobstructed and the signal clear, the entire yarn frame of the doffing machine will rise and head towards the doffing transfer station. 2. The doffing machine will trigger an alarm in the following situations (see attached diagram). Figure 9 After the pusher plate of the winding machine pushes the yarn cake onto the doffing shaft of the doffing machine, the shaft returns to its original position. However, due to a defect in the pusher plate, the last yarn cake may not reach its full position, causing the photoelectric sensor at the top of the doffing shaft to be blocked by the yarn cake paper tube. This triggers an alarm, and the entire doffing machine's yarn frame will not proceed to the next step. This situation requires manual intervention. The yarn cake is pushed towards the end of the doffing shaft until the photoelectric sensor is no longer blocked, and then the reset button is pressed. Only then can the entire doffing machine's yarn frame rise and proceed to the doffing transfer station. Over time, this leads to low efficiency of the doffing machine and an unnecessary increase in manual workload. Moreover, the manual intervention involves employees forcefully pushing the entire row of yarn cakes into the doffing shaft by hand. The contact and forceful pushing process greatly increases the likelihood of damaging the surface of the yarn cakes, thus affecting product quality and the yield rate.

[0003] The photoelectric sensor at the top of the doffing shaft being blocked by the yarn cake tube is caused by a defect in the winding machine's pusher mechanism. The pusher mechanism failed to push the yarn cake into position, and the last yarn cake blocked the photoelectric sensor. Therefore, the photoelectric sensor signal could not be transmitted to the PLC, preventing the doffing machine from proceeding to the next step and triggering an alarm. Since the number of winding machines is large, the modification cost is enormous. However, each doffing machine only has two units in each channel, making modification of the doffing machine more cost-effective. Summary of the Invention

[0004] To address the above problems, this invention provides a photoelectric sensor device and sensing method for the doffing shaft of a doffing machine.

[0005] The technical solution of the present invention is: a photoelectric sensor device for the doffing shaft of a doffing machine, comprising a doffing machine, which is located next to a winding machine, and a track is set in front of the winding machine, the track extending smoothly to the doffing station at the end; the winding machine includes multiple winding positions, each winding position is equipped with an independent pusher mechanism and a winding shaft, the pusher mechanism pushes the completed winding yarn along the winding shaft to the doffing shaft of the doffing machine. The doffing machine includes a frame that can travel along a track, a wire holder, a doffing shaft, a photoelectric sensor, a signal processor, and an actuator. The tail end of the doffing shaft is fixedly connected to the wire holder, which is retractably mounted in the frame. The actuator includes a walking drive mechanism, a lifting drive mechanism, and a telescopic drive mechanism. The walking drive mechanism drives the frame to move laterally along the track so that the doffing shaft is aligned with the winding position or moves to the doffing station at the end. The lifting drive mechanism controls the wire holder to move up and down vertically along the doffing shaft. The telescopic drive mechanism drives the wire holder to move the doffing shaft radially, moving it closer to or away from the winding machine. The front end of the wire seat is provided with a mounting base, and the photoelectric sensor is fixed on the mounting base, with its direction aligned with the last wire cake at the top of the wire dropper. The signal processor is a PLC.

[0006] Preferably, the photosensitive device is an infrared reflective sensor, and the mounting base is an angle-adjustable mounting base.

[0007] Preferably, the winding machine also includes a relay and a shaft origin signal. The shaft origin signal is connected to the relay to generate a signal connection. When the lead seat leaves the origin, the shaft origin signal is disconnected, the relay is normally closed, and the photoelectric sensor works. When the lead seat returns to the origin, the shaft origin signal is transmitted to the relay, the relay is disconnected, the photoelectric sensor is shielded, and the photoelectric sensor does not generate a sensing effect.

[0008] As a further preferred embodiment, the shaft origin signal is detected by an inductive proximity switch, which is mounted on the frame and has an origin iron piece on the lead frame. When the origin iron piece moves with the lead frame to outside the sensing area of ​​the inductive proximity switch, the inductive proximity switch outputs a low-level signal, and the shaft origin signal is disconnected. When the origin iron piece moves with the lead frame into the sensing area of ​​the inductive proximity switch, the inductive proximity switch outputs a high-level signal, and the shaft origin signal is connected.

[0009] A sensing method implemented by a photoelectric sensor on the doffing shaft of a doffing machine includes the following steps: S1. After the winding machine completes the winding of the yarn cake, it calls the unwinding machine. S2. Upon receiving the call signal, the drum winding machine automatically moves along the track to the corresponding winding position. S3. The lifting drive mechanism lowers the wire seat to the preset height, and the wire drop shaft is aligned with the center of the winding shaft. S4. The telescopic drive mechanism pushes the lead seat forward, the lead seat leaves the origin, the shaft origin signal is disconnected, the relay is normally closed, and the photoelectric sensor is normally lit and starts working. S5. The pusher mechanism of the winding machine pushes the yarn cake into the doffing shaft; S6. The photoelectric sensor detects in real time whether the yarn cake is completely inserted into the top of the yarn doffing shaft; S7. When the photoelectric sensor detects that the top of the first yarn cake has reached the preset position, the lifting drive mechanism drives the yarn seat to rise, which compensates for the lower height of the yarn drop shaft due to the weight of the yarn cake, and keeps the yarn drop shaft aligned with the center of the winding shaft again until the yarn pusher mechanism completes the yarn pusher action and stops. S8. When the pusher mechanism pushes out all the yarn cakes and triggers the limit position signal set at the winding position, the winding machine call signal disappears, the pusher mechanism resets, and the photoelectric sensor continuously monitors the stacking height of the yarn cakes. When the stacking height reaches the preset threshold, the telescopic drive mechanism drives the yarn holder to return to its original position. S9. During the wire seat reset process, the origin iron piece re-enters the sensing area of ​​the inductive proximity switch, the shaft origin signal is connected, the relay is disconnected, and the photoelectric sensor is shielded. S10. The doffing machine confirms that the yarn cake stacking is complete and sends a completion signal to the winding machine. The lifting mechanism drives the yarn seat to rise to a safe position with the doffing shaft. The traveling drive mechanism drives the frame to return to the doffing station at the end of the track to unload the yarn cake and complete a single doffing operation. All data is synchronized to the central control system. S11. Repeat steps S1-S10 to perform the next round of tube dropping task.

[0010] Compared with existing technologies, the beneficial effects of this invention are as follows: After the implementation of this invention, the damage rate of the photoelectric sensor is reduced, the photoelectric sensor no longer comes into direct contact with external objects, its service life is greatly extended, the stability and safety of equipment operation are higher, and production efficiency is higher. Simultaneously, the precise feedback of the shaft origin signal controls the wire seat reset error within ±0.1mm, effectively avoiding wire shaft skew or jamming caused by reset deviation; combined with real-time calibration by the central control system, the system can dynamically correct accumulated errors, ensuring that the positioning accuracy remains better than ±0.05mm after hundreds of consecutive operations. Attached Figure Description

[0011] Figure 1 This is a top view of the doffing shaft of the doffing machine of the present invention aligned with the winding shaft.

[0012] Figure 2 This is a top view of the pushing mechanism of the present invention pushing out the silk cake.

[0013] Figure 3 This is a top view of the pusher mechanism of the present invention when the yarn cake is fully pushed onto the yarn dropper.

[0014] Figure 4 This is a side view of the doffing shaft of the doffing machine of the present invention aligned with the winding shaft.

[0015] Figure 5 This is a side view of the pushing mechanism of the present invention pushing out the silk cake.

[0016] Figure 6 This is a side view of the present invention when the pushing mechanism pushes the yarn cake onto the doffing shaft, and the lifting mechanism drives the yarn holder to rise to a safe position with the doffing shaft.

[0017] Figure 7 This is a signal interaction logic diagram of the photoelectric sensor, relay, inductive proximity switch and PLC control module of the present invention.

[0018] Figure 8 This refers to the current technology of photoelectric sensing.

[0019] Figure 9 This refers to the situation where the photoelectric sensor fails to alarm in the existing technology.

[0020] Label Explanation 1: Winding position; 2: Wire feeding mechanism; 3: Winding machine; 4: Wire dosing station; 5: Track; 6: Winding shaft; 7: Wire dosing shaft; 8: Frame; 9: Photoelectric sensor; 10: Inductive proximity switch; 11: Origin iron plate; 12: Wire holder; K1: Relay. Detailed Implementation

[0021] like Figure 1-7 As shown, a photoelectric sensor device for the doffing shaft of a doffing machine includes a doffing machine located next to a winding machine 3. A track 5 is installed in front of the winding machine 3, extending smoothly to the doffing station 4 at its end. The winding machine 3 includes multiple winding positions 1, each equipped with an independent pusher mechanism 2 and a winding shaft 6. The pusher mechanism 2 pushes the completed winding yarn along the winding shaft 6 to the doffing shaft 7 of the doffing machine. The doffing machine includes a frame 8 that can travel along the track 5, a yarn holder 12, a doffing shaft 7, a photoelectric sensor 9, a signal processor, and an actuator. The tail end of the doffing shaft 7 is fixedly connected to the yarn holder 12. 12 is retractably mounted in the frame 8. The actuator includes a walking drive mechanism, a lifting drive mechanism, and a telescopic drive mechanism. The walking drive mechanism drives the frame 8 to move laterally along the track 5 so that the dosing shaft 7 is aligned with the winding position 1 or moves to the dosing position 4 at the end. The lifting drive mechanism controls the wire seat 12 to lift and lower the dosing shaft 7 in the vertical direction. The telescopic drive mechanism drives the wire seat 12 to drive the dosing shaft 7 to extend and retract radially along the dosing shaft 7, moving closer to or away from the winding machine 3. The lifting mechanism, telescopic mechanism, and walking mechanism work together to form a three-dimensional precise positioning closed loop, which is existing technology and will not be described in detail here.

[0022] The front end of the wire seat 12 is provided with a mounting base, and the photosensitive device 9 is fixed on the mounting base, with its direction aligned with the last wire cake at the top of the wire drop shaft 7. The signal processor is a PLC.

[0023] In this embodiment, the photosensitive device 9 is an infrared reflective sensor, and the mounting base is an angle-adjustable mounting base. The angle of the mounting base is adjustable so that the infrared reflective sensor is always aligned with the last yarn cake at the top of the yarn dowel 7. As long as the winding machine 3 pushes the yarn cake to this position, the infrared light is reflected and the signal receiving part of the sensor is detected. When the winding machine 3 has pushed all the yarn cakes, the photosensitive device 9 can also sense whether the last yarn cake is completely in place.

[0024] In this embodiment, the winding machine also includes a relay K1 and a shaft origin signal. The shaft origin signal is connected to the relay K1 to generate a signal connection: when the wire seat 12 leaves the origin, the shaft origin signal is disconnected, the relay K1 is normally closed, and the photoelectric sensor 9 works; when the wire seat 12 returns to the origin, the shaft origin signal is transmitted to the relay K1, the relay K1 is disconnected, the photoelectric sensor 9 is shielded, and the photoelectric sensor 9 does not generate a sensing effect.

[0025] In this embodiment, the shaft origin signal is detected by an inductive proximity switch 10, which is mounted on the frame 8. An origin iron piece 11 is provided on the lead screw 12. When the origin iron piece 11 moves with the lead screw 12 to outside the sensing area of ​​the inductive proximity switch 10, the inductive proximity switch 10 outputs a low-level signal, and the shaft origin signal is disconnected. When the origin iron piece 11 moves with the lead screw 12 into the sensing area of ​​the inductive proximity switch 10, the inductive proximity switch 10 outputs a high-level signal, and the shaft origin signal is connected.

[0026] A sensing method implemented by a photoelectric sensor on the doffing shaft of a doffing machine includes the following steps: S1. After the winding machine 3 completes the winding of the yarn cake, it calls the unwinding machine. S2. Upon receiving the call signal, the winding machine 8 automatically moves along the track 5 to the corresponding winding position 1. Figure 1 As shown; S3. The lifting drive mechanism lowers the wire holder 12 to a preset height, and the wire drop shaft 7 is aligned with the center of the winding shaft 6. Figure 4 As shown; S4. The telescopic drive mechanism pushes the lead seat 12 forward. The lead seat 12 leaves the origin. The inductive proximity switch 10 can no longer sense it. The shaft origin signal is disconnected. The relay K1 is normally closed. The photoelectric sensor 9 is constantly lit and starts to work. S5. The pusher mechanism 2 of the winding machine 3 pushes the wire cake into the doffing shaft 7; S6. The photoelectric sensor 9 detects in real time whether the silk cake is completely inserted into the top of the doffing shaft 7. S7. When the photosensitive device 9 detects that the top of the first silk cake has reached the preset position, such as... Figure 2 and Figure 4 As shown, the lifting drive mechanism drives the wire holder 12 to rise, compensating for the lower height of the wire drop shaft 7 due to the weight of the wire cake, and keeping the wire drop shaft 7 aligned with the center of the winding shaft 6 again until the wire cake pushing mechanism 2 stops after completing the wire pushing action. S8, the pushing mechanism 2 pushes out all the silk cakes, such as Figure 3 As shown, when the limit position signal set at the winding position 1 is triggered (a limit sensor is set at the end of the winding position 1 on the winding machine 3; when the pusher mechanism 2 pushes out all the yarn cakes and reaches the limit sensor, the limit position signal will be triggered), the call signal of the winding machine 3 disappears, the pusher mechanism 2 resets, and the photoelectric sensor 9 continuously monitors the stacking height of the yarn cakes. When the stacking height reaches the preset threshold, the telescopic drive mechanism drives the yarn holder 12 to return to its original position. During the reset process of S9 and the screw seat 12, the origin iron piece 11 re-enters the sensing area of ​​the inductive proximity switch 10. The inductive proximity switch 10 senses the shaft origin signal and connects, the relay K1 disconnects, and the photoelectric sensor 9 is shielded. S10. The doffing machine confirms that the yarn cake stacking is complete and sends a completion signal to the winding machine 3. The lifting mechanism drives the yarn holder 12, carrying the doffing shaft 7, to rise to a safe position. The traveling drive mechanism drives the frame 8 to return along the track 5 to the doffing station 4 at the end to unload the yarn cake. Figure 6 As shown, a single cylinder lowering operation is completed; all data is synchronized to the central control system. S11. Repeat steps S1-S10 to perform the next round of tube dropping task.

[0027] In this complete sensing method, the photoelectric sensor, inductive proximity switch, relay, PLC, wire feeding mechanism of the winding machine, limit sensor, and central control system form a closed-loop feedback network. This ensures that every wire dropping action is precise, traceable, and has a millisecond-level response. The action process is clear, reliable, and without any lag, truly achieving industrial-grade "zero misjudgment" and "self-calibration" capabilities. In the description of this invention, it should be understood that the terms "front end", "end", "upper", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0028] In this invention, unless otherwise explicitly specified and limited, the term "connection" and other such terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to a mechanical connection, a circuit connection, or a signal connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photoelectric sensor device for the doffing shaft of a doffing machine, characterized in that... The system includes a doffing machine located next to the winding machine (3), with a track (5) in front of the winding machine (3) extending smoothly to the doffing station (4) at the end. The winding machine (3) includes multiple winding positions (1), each equipped with an independent pusher mechanism (2) and a winding shaft (6). The pusher mechanism (2) pushes the completed winding yarn along the winding shaft (6) to the doffing shaft (7) of the doffing machine. The doffing machine includes a frame (8) that can travel along the track (5), a yarn holder (12), a doffing shaft (7), a photoelectric sensor (9), a signal processor, and an actuator. The doffing shaft (7) The tail end is fixedly connected to the wire seat (12), which is telescopically located in the frame (8). The actuator includes a walking drive mechanism, a lifting drive mechanism, and a telescopic drive mechanism. The walking drive mechanism drives the frame (8) to move laterally along the track (5) so that the wire dosing shaft (7) is aligned with the winding position (1) or moves to the dosing position (4) at the end. The lifting drive mechanism controls the wire seat (12) to lift and lower the wire dosing shaft (7) in the vertical direction. The telescopic drive mechanism drives the wire seat (12) to drive the wire dosing shaft (7) to extend and retract radially along the wire dosing shaft (7), moving closer to or away from the winding machine (3). The front end of the wire seat (12) is provided with a mounting base, and the photosensitive device (9) is fixed on the mounting base, with its direction aligned with the last wire cake at the top of the wire drop shaft (7). The signal processor is a PLC.

2. The photoelectric sensor device for the doffing shaft of a doffing machine according to claim 1, characterized in that... The photosensitive device (9) is an infrared reflective sensor, and the mounting base is an angle-adjustable mounting base.

3. The photoelectric sensor device for the doffing shaft of a doffing machine according to claim 1, characterized in that... The winding machine also includes a relay (K1) and a shaft origin signal. The shaft origin signal is connected to the relay (K1) to generate a signal connection: when the wire seat (12) leaves the origin, the shaft origin signal is disconnected, the relay (K1) is normally closed, and the photoelectric sensor (9) works; when the wire seat (12) returns to the origin, the shaft origin signal is transmitted to the relay (K1), the relay (K1) is disconnected, the photoelectric sensor (9) is shielded, and the photoelectric sensor (9) does not generate a sensing effect.

4. The photoelectric sensor device for the doffing shaft of a doffing machine according to claim 3, characterized in that... The shaft origin signal is detected by an inductive proximity switch (10), which is mounted on the frame (8). An origin iron piece (11) is set on the lead screw (12). When the origin iron piece (11) moves with the lead screw (12) to outside the sensing area of ​​the inductive proximity switch (10), the inductive proximity switch (10) outputs a low-level signal, and the shaft origin signal is disconnected. When the origin iron piece (11) moves with the lead screw (12) into the sensing area of ​​the inductive proximity switch (10), the inductive proximity switch (10) outputs a high-level signal, and the shaft origin signal is connected.

5. A sensing method implemented by the photoelectric sensor (9) of the doffing machine's doffing shaft as described in any one of claims 1-4, characterized in that... Includes the following steps: S1. After the winding machine (3) completes the winding of the yarn cake, it calls the unwinding machine. S2. When the drum breaker receives the call signal, the frame (8) automatically moves along the track (5) to the corresponding winding position (1). S3. The lifting drive mechanism lowers the wire seat (12) to a preset height, and the wire drop shaft (7) is aligned with the center of the winding shaft (6); S4. The telescopic drive mechanism pushes the wire seat (12) forward, the wire seat (12) leaves the origin, the shaft origin signal is disconnected, the relay (K1) is normally closed, and the photoelectric sensor (9) is normally lit and starts to work. S5. The pusher mechanism (2) of the winding machine (3) pushes the yarn into the doffing shaft (7); S6, The photoelectric sensor (9) detects in real time whether the silk cake is completely inserted into the top of the silk doffing shaft (7); S7. When the photosensitive device (9) detects that the top of the first yarn cake has reached the preset position, the lifting drive mechanism drives the yarn seat (12) to rise, to compensate for the lower height of the yarn drop shaft (7) due to the weight of the yarn cake, and to keep the yarn drop shaft (7) aligned with the center of the winding shaft (6) again until the yarn push mechanism (2) stops after completing the yarn push action. S8. When the pusher mechanism (2) has pushed out all the yarn cakes and triggered the limit position signal set at the winding position (1), the call signal of the winding machine (3) disappears, the pusher mechanism (2) resets, and the photoelectric sensor (9) continuously monitors the stacking height of the yarn cakes. When the stacking height reaches the preset threshold, the telescopic drive mechanism drives the yarn seat (12) to return to the original position. During the reset process of S9 and the wire seat (12), the origin iron piece (11) re-enters the sensing area of ​​the inductive proximity switch (10), the shaft origin signal is connected, the relay (K1) is disconnected, and the photoelectric sensor (9) is shielded. S10. The doffing machine confirms that the yarn cake stacking is complete and sends a completion signal to the winding machine (3). The lifting mechanism drives the yarn seat (12) to rise to a safe position with the doffing shaft (7). The walking drive mechanism drives the frame (8) to return to the doffing station (4) at the end of the track (5) to unload the yarn cake and complete a single doffing operation. The data throughout the process is synchronized to the central control system. S11. Repeat steps S1-S10 to perform the next round of tube dropping task.

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