Carbon fiber broken yarn detection device and method

Abstract

The invention relates to the technical field of carbon fiber broken yarn detection, in particular to a carbon fiber broken yarn detection device and method. The center of the trigger wheel is rotationally connected with a fixed shaft which is fixedly connected with the support frame; the end, facing the supporting frame, of the trigger wheel sinks inwards to form a containing cavity. A baffle is mounted in the accommodating cavity; the proximity switch is arranged on the supporting frame; one side of the proximity switch close to the trigger wheel is provided with a detection port; the detection opening profile allows the baffle to pass through; the trigger wheel is driven by carbon fiber yarn on a production line to rotate around the fixed shaft, and the baffle passes through the detection opening at a constant speed. According to the invention, the carbon fiber production line equipment is effectively utilized to improve the detection effect on the broken carbon fiber yarn.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber broken yarn detection, and particularly to a carbon fiber broken yarn detection device and method. Background Art

[0002] Due to the wide range of application fields of carbon fiber, the production demand is large. In the continuous production process, carbon fiber yarns need to run at a high speed with a constant tension. However, broken yarns will lead to production interruption, material waste, and even equipment damage. Therefore, real-time detection of broken yarns is a key link to ensure production efficiency and product quality. Traditional manual inspection or passive shutdown detection can no longer meet the requirements of modern industry for high efficiency and high precision, and there is an urgent need to develop reliable automated broken yarn detection technology.

[0003] In the prior art, the detection of related yarn broken yarns requires an additional externally installed independent detection device, including equipment such as a driving motor or a transmission mechanism, which occupies the production line space and causes signal delay due to separation from the yarn guide wheel; it also increases energy consumption and requires regular calibration and cleaning; moreover, in order to adapt the independent detection device to the production line, complex processing and assembly are required, increasing the modification cost.

[0004] Therefore, it is necessary to design a detection device that can complete the timely detection of carbon fiber yarn broken yarns by using the existing production line. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present invention provides a carbon fiber broken yarn detection device and method, which directly uses the movement of the yarn during winding to drive the trigger wheel to rotate, so as to reduce the detection cost and achieve the effect of timely detecting carbon fiber yarn broken yarns.

[0006] The present invention provides a carbon fiber broken yarn detection device, including: A support frame; A trigger wheel, the center of which is rotationally connected to a fixed shaft, and the fixed shaft is fixedly connected to the support frame; one end of the trigger wheel facing the support frame is recessed inward to form a receiving cavity; a baffle is installed in the receiving cavity; A proximity switch, arranged on the support frame; a detection port is opened on one side of the proximity switch close to the trigger wheel; the outline of the detection port allows the baffle to pass through; Wherein, the trigger wheel rotates around the fixed shaft driven by the carbon fiber yarn on the production line, and the baffle passes through the detection port at a uniform speed.

[0007] In some embodiments of the present invention, a periodic triggering mechanism is arranged on one side of the trigger wheel; and a sensor assembly is further included, which is fixedly connected to the support frame and faces the triggering mechanism.

[0008] In some embodiments of the present invention, the triggering mechanism includes a trigger ring, arranged on the side of the trigger wheel away from the support frame; evenly distributed trigger pieces are circumferentially arranged on the trigger ring, and the trigger pieces protrude from the outer circular surface of the trigger wheel.

[0009] In some embodiments of the present invention, the sensor assembly includes a first sensor and a second sensor, both of which are located within the circular ring range formed by the trigger piece to the outer circular surface of the trigger wheel.

[0010] In some embodiments of the present invention, it further includes a control unit, which is connected to both the proximity switch and the sensor assembly.

[0011] In some embodiments of the present invention, a spiral groove is provided on the outer circular surface of the trigger wheel from one end surface to the other end of the trigger wheel; a guide vane is arranged in the accommodating cavity, one end of which is electrically connected to the fixed shaft through a rotational connection structure, and the other end is fixedly connected to the spiral groove to maintain electrical conduction.

[0012] The present invention also provides a carbon fiber broken yarn detection method, which includes the following steps: S10: Start the yarn production line, and the carbon fiber yarn travels to drive the trigger wheel to rotate uniformly; calculate the theoretical cycle time T; S20: The proximity switch detects the first pulse signal generated by the baffle passing through the detection port in real time, and records the actual interval time t between two adjacent first pulse signals; S30: Compare the size relationship between the interval time t and the cycle time T in real time, and generate a first path determination result; Among them, in the first path determination result, when at least two consecutive interval times t are greater than the cycle time T, it is determined that the carbon fiber yarn is broken and an alarm is triggered.

[0013] In some embodiments of the present invention, in step S10, calculating the theoretical cycle time T is specifically: Calculate T = π·D / V; Wherein, D is the diameter of the trigger wheel; V is the traveling speed of the carbon fiber yarn.

[0014] In some embodiments of the present invention, it further includes: S40: Set the rotational speed threshold Ny of the trigger wheel; detect the periodic movement of the trigger piece in real time through the sensor assembly to generate a second pulse signal; S50: Calculate the real-time rotational speed Ns of the trigger wheel according to the second pulse signal; S60: Compare the real-time rotational speed Ns with the rotational speed threshold Ny to generate a second path determination result; Among them, in the second path determination result, when the real-time rotational speed Ns is less than the rotational speed threshold Ny for a certain period of time, it is determined that the carbon fiber yarn is broken.

[0015] In some embodiments of the present invention, it further includes: S70: Synchronously analyze the first path determination result and the second path determination result; Among them, when the determination of carbon fiber yarn breakage is satisfied simultaneously, it is confirmed as a real yarn breakage; when only one determination result is a carbon fiber yarn breakage, record the path to which this determination result belongs.

[0016] The beneficial effects of the present invention are as follows: The present invention improves the yarn guide wheel in the carbon fiber production line into a trigger wheel, saves independent detection equipment, and reduces the detection cost; the proximity switch is triggered by the baffle plate one by one to intuitively display whether the yarn is broken; through the dual cooperation detection of the baffle plate and the trigger piece, combined with cross-verifying the detection results, the false detection rate of yarn breakage is reduced, and it accurately identifies whether the yarn is broken; by removing the static electricity on the surface of the trigger wheel, the adsorption of dust and electromagnetic interference is eliminated, and the detection accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is the overall schematic diagram of the carbon fiber yarn breakage detection device in the embodiment of the present invention; Figure 2 It is the side view structure schematic diagram of the carbon fiber yarn breakage detection device in the embodiment of the present invention; Figure 3 It is the top view structure schematic diagram of the carbon fiber yarn breakage detection device in the embodiment of the present invention; Figure 4 It is the front view structure schematic diagram of the carbon fiber yarn breakage detection device in the embodiment of the present invention; Figure 5 It is the step schematic diagram of the carbon fiber yarn breakage detection method in the embodiment of the present invention.

[0019] Reference numerals: 1, support frame; 2, trigger wheel; 21, fixed shaft; 22, accommodation cavity; 23, baffle plate; 24, trigger mechanism; 241, trigger ring; 242, trigger piece; 25, spiral groove; 26, guide vane; 27, rotational connection structure; 3, proximity switch; 31, detection port; 4, sensor assembly; 41, first sensor; 42, second sensor. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] like Figures 1 to 4 The carbon fiber yarn break detection device and method shown include: The support frame 1 can directly adopt a support on the carbon fiber yarn production line to carry the device required for the yarn break detection function; The trigger wheel 2 is centrally rotatably connected to the fixed shaft 21, and the fixed shaft 21 is fixedly connected to the support frame 1; the trigger wheel 2 is recessed inwardly toward one end of the support frame 1 to form an accommodating cavity 22; a baffle 23 is installed in the accommodating cavity 22; In some embodiments of the present invention, the trigger wheel 2 is obtained by improving the yarn guide wheel in the production line; the yarn guide wheel is used to ensure that the yarn runs along a preset path to avoid deviation or entanglement. The outer cylindrical surface of the yarn guide wheel is in contact with the yarn, and the yarn tension is controlled by the winding angle and friction force to maintain a constant running speed.

[0024] The proximity switch 3 is arranged on the support frame 1; a detection port 31 is provided on a side of the proximity switch 3 close to the trigger wheel 2; the contour of the detection port 31 accommodates the baffle 23 to pass through, so as to avoid mutual collision between components; the proximity switch 3 is a general term, referring to a sensor that detects the approach of an object in a non-contact manner, and different proximity switches 3 can be selected according to the material of the baffle 23, such as an inductive proximity switch 3 that can detect a metal baffle 23, a capacitive proximity switch 3 that can detect a metal or non-metal baffle 23, and a Hall proximity switch 3 that can detect a magnetic baffle 23; The trigger wheel 2 is driven by the carbon fiber yarn on the production line to rotate around the fixed axis 21, and the baffle 23 passes through the detection port 31 at a constant speed.

[0025] The specific working principle of the present invention is as follows: The carbon fiber yarn continuously travels on the production line. When it passes through the trigger wheel 2, i.e., the yarn guide wheel, it drives the trigger wheel 2 to rotate around the fixed shaft 21 through friction. The end face of the trigger wheel 2 facing the support frame 1 is provided with a receiving cavity 22, and the baffle 23 installed in the cavity rotates synchronously with the trigger wheel 2. With the production line speed unchanged, the baffle 23 also uniformly passes through the detection port 31 of the proximity switch 3. When the baffle 23 passes through the detection port 31 circle by circle as it travels along the production line, it triggers the proximity switch 3 to periodically output high-level pulse signals. When the pulse signals are no longer output, it means that the yarn guide wheel has stopped rotating. The only reason for the yarn guide wheel to stop rotating is the termination of the yarn movement. On a normally operating production line, the direct reason for the termination of the yarn movement is usually yarn breakage. The goal of the detection device is to quickly detect the stop of the yarn movement, rather than accurately locate the breakage point. Regardless of the position of the breakage point, as long as the overall movement of the yarn is interrupted, the yarn guide wheel will surely stop rotating. Therefore, the triggering of the yarn breakage detection device has nothing to do with the position of the breakage point and only depends on whether the yarn guide wheel stops rotating. In this way, it can be judged that the yarn has broken.

[0026] At this time, a fixed time can also be set according to the production line speed so that the baffle 23 passes around the proximity switch 3 within this fixed time during the yarn winding process. Thus, during the yarn winding process, if no trigger signal of the proximity switch 3 is detected within the fixed time, it can be determined that the yarn has broken, and the detection device automatically alarms and stops, saving the manual judgment time and improving the timeliness of detecting yarn breakage. It can also be determined that the yarn has broken by judging the interval time between each trigger signal. If the interval time suddenly becomes longer, and the subsequent several intervals are also very long or even no trigger occurs, it can also be determined that the yarn has broken. There can be multiple judgment methods, as long as they can be realized based on the above detection device.

[0027] In some embodiments of the present invention, as Figure 2 shown, a periodic triggering mechanism 24 is provided on one side of the trigger wheel 2 and rotates with the rotation of the trigger wheel 2; It further includes a sensor assembly 4, which is fixedly connected to the support frame 1 and faces the triggering mechanism 24. When the triggering mechanism 24 rotates with the trigger wheel 2, it continuously passes through the sensor assembly 4, and the sensor assembly 4 receives periodic signals in real time to determine whether the yarn has broken.

[0028] By adding the triggering mechanism 24 and the sensor assembly 4, a second method for detecting yarn breakage is added, which combines with the baffle 23 to form a dual-path detection method, improving the detection accuracy of yarn breakage. Moreover, such a design can be used as a backup detection path under normal working conditions, not only saving energy consumption but also enabling timely activation when the proximity switch 3 and the baffle 23 detection fail, reducing the necessity of production line shutdown for maintenance and improving the anti-interference ability of the overall detection device.

[0029] As Figure 3As shown, preferably, the trigger mechanism 24 includes a trigger ring 241 disposed on the side of the trigger wheel 2 away from the support frame 1. The trigger ring 241 can achieve the effect of quick disassembly and assembly by means of magnetic adsorption or snap fixation, etc. The trigger ring 241 is circumferentially provided with uniformly distributed trigger pieces 242 protruding from the outer circular surface of the trigger wheel 2 to avoid being blocked by the yarn and thus not being recognized by the sensor assembly 4.

[0030] In some embodiments of the present invention, as Figure 4 shown, the sensor assembly 4 includes a first sensor 41 and a second sensor 42. Both the first sensor 41 and the second sensor 42 are located within the circular ring range formed by the trigger piece 242 to the outer circular surface of the trigger wheel 2. Two different types of sensors, such as Hall sensors and photoelectric sensors, can be used to cope with the detection environments under different working conditions, and also avoid misjudgment caused by the failure of a single sensor, improving the reliability of detection.

[0031] Preferably, it further includes a control unit connected to both the proximity switch 3 and the sensor assembly 4.

[0032] There are two detection paths in the detection device, one is the inner baffle 23 and the other is the outer trigger piece 242. The control unit will receive the signals of these two paths simultaneously. When the yarn is running normally, the signals on both sides should change synchronously. If only one side's signal has a problem (for example, the detection port 31 is blocked by dust), the control unit will not alarm first but check the signal of the other path. Only when both sides show abnormalities will it be confirmed that the yarn is broken, thus avoiding false alarms due to a certain component failure or dust interference, and making the detection result more reliable. It is also possible to only activate one path (the baffle 23 and the proximity switch 3 or the trigger piece 242 and the sensor assembly 4) that is more suitable for the detection environment according to the different detection environments to save energy consumption. If the production line needs continuous detection, but one of the detection paths has a problem, the other detection path can be used for separate detection in time, so that the production line does not need to be shut down urgently for maintenance, and it can be dealt with when this batch of yarn is finished or during regular maintenance, reducing the losses caused by sudden shutdown. In some embodiments of the present invention, as Figures 1 to 3 shown, a spiral groove 25 is formed on the outer circular surface of the trigger wheel 2 from one end face of the trigger wheel 2 to the other end. The rotation direction of the spiral groove 25 is coordinated with the movement direction of the yarn to form a "slide effect" of charge migration. A flow guide piece 26 is disposed in the accommodation cavity 22. One end is electrically connected to the fixed shaft 21 through a rotational connection structure 27, and the other end is fixedly connected to the spiral groove 25 to maintain electrical conduction.

[0033] When the carbon fiber yarn is in frictional contact with the surface of the yarn guide wheel, due to the triboelectrification effect, charge transfer will occur between the yarn and the yarn guide wheel. If the charge is not removed in time, electrostatic adsorption may cause fiber entanglement and dust accumulation, affecting the sensor and resulting in false detection. The spiral groove 25 forms a continuous conduction path on the surface of the yarn guide wheel. The electric field lines formed by the static charges on the surface of the yarn guide wheel will preferentially extend along the diversion groove, reducing the charge diffusion resistance. The static charges can move along the spiral groove 25 towards the grounding end. Then, at the end of the spiral groove 25 near the support frame 1, it is transmitted to the rotating connection structure 27 through the diversion piece 26. The rotating connection structure 27 rotates around the fixed shaft 21 with the trigger wheel 2. In this way, when the trigger wheel 2 rotates, the static charges can also be transmitted to the fixed shaft 21. By adding a grounding wire to the production line or the detection device, the static charges can be guided to the ground to complete the charge transfer, making the detection result more reliable.

[0034] The present invention also provides a method for detecting broken carbon fiber yarns, as Figure 5 shown, including the following steps: S10: Start the yarn production line, and the advancing carbon fiber yarn drives the trigger wheel 2 to rotate at a constant speed; calculate the theoretical cycle time T; S20: The proximity switch 3 continuously detects the first pulse signal generated by the baffle 23 passing through the detection port 31, and records the actual interval time t between two adjacent first pulse signals; S30: Continuously compare the size relationship between the interval time t and the cycle time T in real time, and generate a first path determination result; Among them, in the first path determination result, when at least two consecutive interval times t are greater than the cycle time T, it is determined that the carbon fiber yarn is broken and an alarm is triggered.

[0035] Preferably, in step S10, calculating the theoretical cycle time T specifically is: Calculate T = π • D / V; where D is the diameter of the trigger wheel 2; V is the advancing speed of the carbon fiber yarn; Converting the linear motion of the yarn into the rotation period of the trigger wheel 2, even if different diameters of the trigger wheel 2 are replaced or the yarn speed is adjusted, the theoretical cycle time T can be quickly calculated, providing a dynamic reference for broken yarn determination.

[0036] In some embodiments of the present invention, it further includes: S40: Set the rotation speed threshold Ny of the trigger wheel 2; continuously detect the periodic motion of the trigger piece 242 through the sensor assembly 4 to generate a second pulse signal; S50: Calculate the real-time rotation speed Ns of the trigger wheel 2 according to the second pulse signal; the real-time rotation speed Ns can be calculated by Ns = k / T, where k is a safety factor preset by humans and is a constant; S60: Compare the real-time rotational speed Ns with the rotational speed threshold Ny to generate a second path determination result; Among them, in the second path determination result, when the real-time rotational speed Ns is less than the rotational speed threshold Ny for a certain period of time, it is determined that the carbon fiber yarn is broken.

[0037] By setting the rotational speed threshold Ny of the trigger wheel 2 and detecting the pulse signal of the trigger piece 242 on the trigger ring 241 in real time, the system constructs a second detection path independent of the inner wall baffle 23. The sensor assembly 4 captures the second pulse signal generated by the periodic movement of the trigger piece 242, dynamically calculates the real-time rotational speed Ns based on the pulse interval, and continuously compares it with the preset rotational speed threshold Ny: when the real-time rotational speed Ns is lower than the rotational speed threshold Ny and the duration exceeds the fault tolerance threshold, that is, a certain time preset by humans, it is determined as yarn breakage; the problem of misjudgment caused by changes in production parameters due to the traditional fixed threshold is solved, and at the same time, the "continuous overrun" (when the real-time rotational speed Ns is less than the rotational speed threshold Ny for a certain period of time) determination mechanism effectively filters out instantaneous jitter or voltage fluctuation interference, improving the accuracy of detection.

[0038] In some embodiments of the present invention, it further includes: S70: Synchronously analyze the first path determination result and the second path determination result; Among them, when the determination of carbon fiber yarn breakage is satisfied simultaneously, it is confirmed as real yarn breakage; when only one determination result is carbon fiber yarn breakage, record the path to which this determination result belongs.

[0039] This step realizes dual verification and fault tolerance management by synchronously analyzing the first path judgment result generated by the baffle 23 in the accommodation cavity 22 and the second path judgment result generated by the trigger piece 242 on the trigger ring 241; when both paths determine yarn breakage, it is confirmed as real yarn breakage and the machine stops immediately to avoid ineffective shutdown caused by misjudgment of a single path; if only a single path is abnormal (such as the baffle 23 being blocked by dust or the trigger piece 242 being damaged), the faulty path is recorded but production is not interrupted, and at the same time, it automatically switches to the normal path for continuous detection, which not only ensures the continuity and reliability of detection but also provides clear guidance for subsequent maintenance.

[0040] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon fiber yarn breakage detection device, characterized in that, Including: Support frame (1); Trigger wheel (2), centrally rotationally connected to a fixed shaft (21), and the fixed shaft (21) is fixedly connected to the support frame (1); one end of the trigger wheel (2) facing the support frame (1) is recessed inward to form a receiving cavity (22); a baffle (23) is installed in the receiving cavity (22); Proximity switch (3), arranged on the support frame (1); a detection port (31) is opened on one side of the proximity switch (3) close to the trigger wheel (2); the outline of the detection port (31) allows the baffle (23) to pass through; Wherein, the trigger wheel (2) rotates around the fixed shaft (21) driven by the carbon fiber yarn on the production line, and the baffle (23) passes through the detection port (31) at a constant speed.

2. The carbon fiber broken yarn detection device according to claim 1, wherein A periodic triggering mechanism (24) is arranged on one side of the trigger wheel (2); It further includes a sensor assembly (4), fixedly connected to the support frame (1) and facing the triggering mechanism (24).

3. The carbon fiber broken yarn detection device according to claim 2, characterized in that, The triggering mechanism (24) includes a trigger ring (241), arranged on the side of the trigger wheel (2) away from the support frame (1); evenly distributed trigger pieces (242) are arranged circumferentially on the trigger ring (241), and the trigger pieces (242) protrude from the outer circular surface of the trigger wheel (2).

4. The carbon fiber broken yarn detection device according to claim 3, characterized in that, The sensor assembly (4) includes a first sensor (41) and a second sensor (42), and both the first sensor (41) and the second sensor (42) are located within the range of the circular ring formed by the trigger piece (242) to the outer circular surface of the trigger wheel (2).

5. The carbon fiber broken yarn detection device according to claim 2, characterized in that, It further includes a control unit, connected to both the proximity switch (3) and the sensor assembly (4).

6. The carbon fiber broken yarn detection device according to claim 1, characterized in that, A spiral groove (25) is opened on the outer circular surface of the trigger wheel (2) from one end face to the other end of the trigger wheel (2); a flow guiding piece (26) is arranged in the receiving cavity (22), one end is electrically connected to the fixed shaft (21) through a rotational connection structure (27), and the other end is fixedly connected to the spiral groove (25) to maintain electrical conduction.

7. A carbon fiber broken yarn detection method, which uses the carbon fiber broken yarn detection device according to any one of claims 1 to 6, characterized in that, Including the following steps: S10: Start the yarn production line, and the carbon fiber yarn travels to drive the trigger wheel to rotate at a constant speed; calculate the theoretical cycle time T; S20: The proximity switch detects the first pulse signal generated by the baffle passing through the detection port in real time, and records the actual interval time t between two adjacent first pulse signals; S30: Compare the size relationship between the interval time t and the cycle time T in real time, and generate a first path determination result; Wherein, in the first path determination result, when at least two consecutive interval times t are greater than the cycle time T, it is determined that the carbon fiber yarn is broken and an alarm is triggered.

8. The carbon fiber broken yarn detection method according to claim 7, characterized in that, In step S10, calculating the theoretical cycle time T specifically is: Calculate T = π·D / V; Wherein, D is the diameter of the trigger wheel; V is the traveling speed of the carbon fiber yarn.

9. The carbon fiber yarn breakage detection method according to claim 8, wherein, It further includes: S40: Set the rotational speed threshold Ny of the trigger wheel; detect the periodic movement of the trigger piece in real time through the sensor assembly to generate a second pulse signal; S50: Calculate the real-time rotational speed Ns of the trigger wheel according to the second pulse signal; S60: Compare the real-time rotational speed Ns with the rotational speed threshold Ny to generate a second path determination result; Among them, in the second path determination result, when the real-time rotation speed Ns is less than the rotation speed threshold Ny for a certain period of time, it is determined that the carbon fiber yarn is broken.

10. The carbon fiber broken yarn detection method according to claim 9, wherein It further includes: S70: Synchronously analyze the first path determination result and the second path determination result; Among them, when the determination of the carbon fiber yarn breakage is satisfied simultaneously, it is confirmed as a real yarn breakage; When only one determination result is the carbon fiber yarn breakage, record the path to which this determination result belongs.

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