Carbon fiber contact type joint detection system and method

Abstract

The invention relates to the technical field of carbon fiber joint detection, in particular to a carbon fiber contact type joint detection system and method, and the system comprises a box body which is connected with an external production line; the touch mechanism comprises a reed of which one end is fixedly connected with the box body, a contact arranged on the reed, and a contact pin arranged at the other end of the reed; the contact is fixed on the reed through a plurality of fixing points which are arranged along the length direction of the reed; the circuit mechanism comprises a circuit cathode connected with the fixed end of the reed, a contact point which is arranged opposite to the contact pin and has a set distance with the contact pin, a resistor connected with the contact point, and a circuit anode connected with the other end of the resistor; wherein the contact pin can be close to or far away from the contact point, when the contact pin is in contact with the contact point, the circuit is switched on, and when the contact pin is far away from the contact point, the circuit is switched off. By adjusting the distance between the contact and the fixed wheel in the external production line, the detection accuracy of different types of carbon fiber yarn joints is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber joint detection, and particularly to a carbon fiber contact joint detection system and method. Background Art

[0002] As a high-performance material, carbon fiber is widely used in the field of new energy commercial vehicle manufacturing. For example, the chassis of a commercial vehicle body adopts a carbon fiber pultrusion process. During the forming process, the yarn joint is one of the key factors affecting product quality. Since carbon fiber yarns need to be spliced during unwinding, winding, and processing, the thickness, strength, and other characteristics at the joint are significantly different from those of normal yarns. If not detected and processed in time during the subsequent pultrusion process, it will lead to interruption of subsequent processes or defects in the finished product. Therefore, during the unwinding process of pultrusion, it is necessary to detect the yarn.

[0003] In the prior art, the distance between a fixed contact and a fixed wheel is mostly used for detection, which cannot adapt to the thickness differences of different yarn types, and the contact pressure between the contact and the yarn is unstable, resulting in difficulties in distinguishing between joints and hair entanglement, twisting interference, etc., which may lead to misjudgment of the detection results and missed detection of joints. Therefore, developing a detection technology that can detect multiple yarn types and accurately identify joints has become the core requirement for improving the automation level of the production line and the product yield. Summary of the Invention

[0004] In view of at least one of the above technical problems, the present invention provides a carbon fiber contact joint detection system and method, which adjusts the position of the contact to change the distance relative to the fixed wheel in the external production line to achieve accurate detection of yarns with different thicknesses.

[0005] The present invention provides a carbon fiber contact joint detection system, including: A box body connected to an external production line; A triggering mechanism, including a reed with one end fixedly connected to the box body, a contact provided on the reed, and a contact pin provided on the other end of the reed; the contact is fixed on the reed through a fixed point, and a plurality of fixed points are arranged along the length direction of the reed; A circuit mechanism, including a circuit negative electrode connected to the fixed end of the reed, a contact point disposed opposite to the contact pin with a set distance, a resistor connected to the contact point, and a circuit positive electrode connected to the other end of the resistor; Wherein, the contact pin can approach or move away from the contact point. When the contact pin contacts the contact point, the circuit is turned on, and when the contact pin moves away from the contact point, the circuit is turned off.

[0006] In some embodiments of the present invention, a feedback mechanism is further included and is connected to the circuit mechanism; The feedback mechanism includes a detector for detecting the circuit state in the circuit mechanism; A counter for recording the number of times the circuit is turned on; A timer for recording the time between two adjacent circuit turn - ons.

[0007] In some embodiments of the present invention, it further includes a positioning rod, on the same side as the contact relative to the reed. One end is fixedly connected to the box body, and the other end extends along the width direction of the reed to contact the reed.

[0008] In some embodiments of the present invention, a rotating shaft is provided at one end of the box body, and the rotating shaft is fixedly connected to the external production line; the box body rotates around the axis of the rotating shaft; a pin hole is provided at the other end of the box body.

[0009] In some embodiments of the present invention, it further includes a controller for controlling the start and stop of the detection system.

[0010] The present invention also provides a detection method for a carbon fiber contact joint, including the following steps: S10: One end of the box body is rotatably arranged on the external production line through a rotating shaft, and the box body is fixed on the external production line by inserting a pin rod into the pin hole; S20: Adjust the position of the contact relative to the fixed pulley in the external production line according to the thickness of the carbon fiber yarn; S30: Start the external production line to drive the carbon fiber to move forward, detect the circuit state of the circuit mechanism, and generate a circuit state result; S40: According to the circuit state result, calculate the comprehensive score P, and judge the yarn condition of the carbon fiber through the comprehensive score P.

[0011] In some embodiments of the present invention, in step S20, adjusting the position of the contact relative to the fixed pulley in the external production line specifically is: Calculate D = D0 + k·(Ts - Tb); Wherein, D is the actual distance between the contact and the fixed pulley; D0 is the initial distance between the contact and the fixed pulley set artificially; k is the adjustment coefficient set artificially, which is a constant; Ts is the actual thickness of the carbon fiber yarn; Tb is the standard thickness of the carbon fiber yarn.

[0012] In some embodiments of the present invention, calculating the comprehensive score P in step S40 specifically is: Construct P = α·N + β / Δt; Wherein, α is the number coefficient set artificially, which is a constant; N is the number of times the circuit is turned on per unit time; β is the time coefficient set artificially, which is a constant; Δt is the time interval between two circuit turn - ons.

[0013] In some embodiments of the present invention, in step S40, it further includes thickness correction for the comprehensive score P during twisting: Establish Ph = P·(1 - γ·Tj / Tb); Among them, Ph is the comprehensive score after thickness correction; γ is the artificially set thickness correction coefficient, which is a constant; Tj is the twist thickness of the carbon fiber yarn.

[0014] In some embodiments of the present invention, it further includes: S50: Generate a yarn judgment result according to the yarn condition, send a shearing signal for the yarn belonging to the carbon fiber joint, and send a cleaning signal for the yarn belonging to the hairiness entanglement.

[0015] The beneficial effects of the present invention are as follows: Through the design of the rotating shaft and the pin hole of the box body, the system can be quickly installed and fixed, adapting to different production line layouts. When it is necessary to cut the joint and clean the hairiness, the downtime of the production line can be reduced, ensuring the continuity of the yarn. By adjusting the position of the contact on the reed, the distance between the contact and the fixed wheel in the external production line can be adjusted, and the detection system can adapt to carbon fiber yarns of different types and thicknesses for detection, improving the detection accuracy. Description of the Drawings

[0016] 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.

[0017] Figure 1 It is a schematic side sectional view of the carbon fiber contact joint detection system in the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the carbon fiber contact joint detection system in the external production line in the embodiment of the present invention; Figure 3 It is a schematic structural diagram of the interior of the box body in the carbon fiber contact joint detection system in the embodiment of the present invention; Figure 4 It is a schematic step diagram of the carbon fiber contact joint detection method in the embodiment of the present invention.

[0018] Reference numerals: 1. Box body; 11. Rotating shaft; 12. Pin hole; 2. Trigger mechanism; 21. Reed; 22. Contact; 23. Contact pin; 3. Circuit mechanism; 31. Circuit negative electrode; 32. Contact point; 33. Resistor; 34. Circuit positive electrode; 4. Positioning rod. Detailed Embodiments

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with 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 the embodiments.

[0020] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate 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.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] A carbon fiber yarn joint refers to a joint formed by connecting two sections of yarn through physical or chemical methods during the production or processing of carbon fiber due to yarn breakage, reel change or process requirements; the joint usually shows an increase in local thickness, disordered fiber arrangement or adhesive residue. The fiber arrangement at the joint is discontinuous, resulting in local stress concentration, which reduces the tensile strength. Under dynamic load, the joint is prone to become a crack initiation point, accelerating material failure. Therefore, it is necessary to remove the joints on the carbon fiber yarn.

[0023] As Figures 1 to 3 shown, the carbon fiber contact joint detection system includes: A box body 1, connected to an external production line, for accommodating the components of the entire detection device; A trigger mechanism 2, including a reed 21 with one end fixedly connected to the box body 1, a contact 22 arranged on the reed 21, and a probe 23 arranged on the other end of the reed 21; the contact 22 is fixed on the reed 21 through a fixed point, and several fixed points are arranged along the length direction of the reed 21; due to the elastic deformation of the reed 21 itself, when the contact 22 is touched by the carbon fiber yarn, the reed 21 generates a deforming force, pressing down the other end that is not fixed and has the probe 23; the form of the fixed point here can adopt a threaded connection method, fixing the contact 22 with a screw, or can adopt a form of designing a buckle on the reed 21 to fix the contact 22, or can also adopt forms such as a spring clip to fix the contact 22.

[0024] A circuit mechanism 3, including a circuit negative electrode 31 connected to the fixed end of the reed 21, a contact point 32 arranged opposite to the probe 23 with a set distance, a resistor 33 connected to the contact point 32, and a circuit positive electrode 34 connected to the other end of the resistor 33; Among them, the stylus 23 can approach or move away from the contact point 32. When the stylus 23 contacts the contact point 32, the circuit is turned on. When the stylus 23 moves away from the contact point 32, the circuit is turned off.

[0025] The working principle of the present invention is specifically as follows: Install each component in the box body 1. One end of the box body 1 is rotatably installed on the frame of the external production line. At this time, the box body 1 can rotate around one end on the frame; the other end of the box body 1 is fixed on the frame by a detachable and convenient fixing method, so that the box body 1 cannot rotate. According to the type of yarn thickness, select the distance between the contact 22 and the fixed wheel that transports the carbon fiber yarn on the external production line, so that joints of different models of yarn can be detected.

[0026] When the yarn travels, the joint or hair entanglement will collide with the contact 22 in the triggering mechanism 2. The joint is due to the fact that at the location of the joint on the yarn, there is the thickness of the yarn itself and the thickness of the joint, so it exceeds the normal yarn thickness. And the distance between the contact 22 and the yarn is less than the thickness of the joint, so the joint will collide with the contact 22; the hair is because during the production process, the fixed wheel on the production line will entangle the hair on the yarn, and the detection system is installed on one side of the fixed wheel. When there is more hair entangled on the fixed wheel, the original single thickness of the hair is very thin, but after superposition, the thickness can also collide with the contact 22, forming a periodic and regular collision with the contact 22; the contact 22 presses down the reed 21 and drives the stylus 23 at one end of the reed 21 to move downward until it contacts the contact point 32 on the circuit mechanism 3. At this time, the stylus 23 serves as a conductor to connect the positive electrode 34 of the circuit at one end of the resistor 33 in the circuit mechanism 3 and the negative electrode 31 of the circuit at one end of the reed 21, so that the circuit is turned on; at this time, it can be used as the detection result of detecting the carbon fiber yarn once.

[0027] However, due to the existence of hair entanglement or other interference situations, it may not be the joint on the yarn that causes the circuit to be turned on. Therefore, we still need to further distinguish whether it is the joint on the yarn; use the feedback mechanism to monitor the circuit state in real time, record the number of times N of circuit conduction and the interval time Δt between two circuit conductions during the detection process, and judge whether it is the joint or the hair entanglement that triggers the circuit conduction by calculating the comprehensive score P. The data intuitively shows that when it is periodically triggered, it is the hair entanglement that is detected, and when it is triggered irregularly and in a short time, it is the joint that is detected. If there is a twisting process, it is also necessary to further correct the comprehensive score P to eliminate the interference of the twisting process on the detection result. It is also possible to avoid the situation where the twisting triggers the contact 22 by adjusting the distance between the contact 22 and the fixed wheel, so as to improve the detection accuracy.

[0028] When a joint is detected, a shearing signal is sent to the staff, and after the joint is sheared off, it is rewound; when filament entanglement is detected, a cleaning signal is sent to the staff to remove the filaments wound around the fixed wheel, so that the entire detection system will not conduct the circuit due to the filaments colliding with the contact 22 again within a certain period of time.

[0029] Preferably, it further includes a feedback mechanism, which is connected to the circuit mechanism 3; The feedback mechanism includes a detector that detects the circuit state (conducting state or non-conducting state) in the circuit mechanism 3 and captures each contact event between the contact pin 23 and the contact point 32; A counter is used to record the number of times N that the circuit conducts within a unit time, which helps to subsequently determine whether it is a joint or filament entanglement that triggers the circuit to conduct; A timer is used to record the time Δt between two adjacent circuit conductions; combined with the conduction times N, the regularity of triggering the circuit to conduct can be better analyzed, thereby assisting the detection of the detection system.

[0030] As Figure 3 shown, in some embodiments of the present invention, it further includes a positioning rod 4, which is on the same side as the contact 22 relative to the reed 21. One end is fixedly connected to the box body 1, and the other end extends along the width direction of the reed 21 to contact the reed 21. By physically restricting the rebound amplitude of the reed 21, it is prevented that after the contact 22 is collided, the reed 21 is driven to press down and then rebounds excessively and impacts the box body 1; by physically restricting the rebound amplitude of the reed 21, it is prevented that the reed 21 rebounds excessively and impacts the box body 1 after being triggered, avoiding fatigue damage of the reed 21 caused by the impact on the box body 1, and at the same time preventing the box body 1 from being damaged due to frequent impacts, improving the stability of the detection system; it also ensures that the reed 21 can return to the preset initial position every time it rebounds, so that the distance between the contact 22 and the fixed wheel in the external production line returns to the set length, preparing for triggering the contact 22 when the yarn travels next time, avoiding false triggering or missed detection caused by inaccurate reset, and improving the reliability of the detection result.

[0031] In some embodiments of the present invention, please refer to Figure 2 , a rotating shaft 11 is provided at one end of the box body 1, and the rotating shaft 11 is fixedly connected to the external production line; the box body 1 rotates around the axis of the rotating shaft 11; a pin hole 12 is provided at the other end of the box body 1; this design allows the detection system to adjust the angle or position of the box body 1 relative to the external production line rack according to actual production needs, ensuring the best contact position between the contact 22 and the yarn; the position of the box body 1 can be quickly fixed by inserting a pin rod, preventing the box body 1 from accidentally moving during the detection process and ensuring the detection stability.

[0032] When the operator needs to repair the detection system or production line, replace components such as the contact 22 and the contact pin 23, or replace the yarn, the box body 1 can be freely rotated around the rotating shaft 11 by gravity by pulling out the pin rod, which will not interfere with the production line and the yarn, supports seamless switching of multiple processes and multiple yarn types, reduces installation and maintenance time, and significantly improves detection and production efficiency.

[0033] Preferably, it further includes a controller to control the start and stop of the detection system, ensuring that the system can quickly enter the working state or safely shut down when needed; when manually cleaning the fluff, it may accidentally touch the detection system. By adding a controller to control the start or stop of the system, the detection function can be turned off during fluff cleaning to reduce the accidental touch rate; a fault warning function can also be added. When it is detected that the contact 22 is stuck or there is a circuit fault, the controller automatically shuts down and issues an alarm to avoid equipment damage or production interruption.

[0034] The present invention also provides a method for detecting a carbon fiber contact joint, as Figure 3 shown, including the following steps: S10: One end of the box body 1 is rotatably arranged on the external production line through the rotating shaft 11. The box body 1 is fixed on the external production line by inserting the pin rod into the pin hole 12; through the design of the rotating shaft 11 and the pin hole 12, the box body 1 can be flexibly rotated to the optimal detection angle and quickly fixed, ensuring that the detection system is adapted to the production line layout. The installation time is greatly reduced compared with the traditional method. After being installed in place, the box body 1 is also more stable through the support at both ends.

[0035] S20: Adjust the position of the contact 22 relative to the fixed wheel in the external production line according to the thickness of the carbon fiber yarn; if the same position is adopted, when detecting a carbon fiber model with a relatively thick thickness, the contact 22 will be continuously collided, resulting in the conduction of the entire circuit mechanism 3 and unable to effectively identify the joint on the yarn.

[0036] S30: Start the external production line to drive the carbon fiber to move forward, detect the circuit state of the circuit mechanism 3, and generate a circuit state result; S40: According to the circuit state result, calculate the comprehensive score P, and judge the yarn condition of the carbon fiber through the comprehensive score P.

[0037] In some embodiments of the present invention, in step S20, adjusting the position of the contact 22 relative to the fixed wheel in the external production line specifically is: Calculate D = D0 + k • (Ts - Tb); Among them, D is the actual distance from the contact 22 to the fixed wheel; D0 is the initial distance from the contact 22 to the fixed wheel set artificially; k is the adjustment coefficient set artificially, which is a constant. The initial adjustment coefficient k can be set based on the yarn type and production line speed, referring to historical data or industry experience. Subsequently, it can be further adjusted according to the test run observation and detection structure; Ts is the actual thickness of the carbon fiber yarn; Tb is the standard thickness of the carbon fiber yarn; The formula adopts a linear relationship, controls the sensitivity through the adjustment coefficient k, and balances the detection accuracy and anti-interference ability; when the actual thickness Ts is greater than the standard thickness Tb, the actual distance D will be greater than the initial distance D0 due to calculation, avoiding damage caused by the contact 22 pressing on the yarn excessively; when the actual thickness Ts is less than the standard thickness Tb, the actual distance D will be less than the initial distance D0 due to calculation, ensuring that the contact 22 can contact the joint on the yarn and preventing missed detection; by dynamically adjusting the actual distance from the contact 22 to the fixed wheel, different yarn types are tested, avoiding misjudgment caused by changes in yarn thickness, and improving the detection accuracy.

[0038] Preferably, in step S40, calculating the comprehensive score P is specifically: Construct P = α•N + β / Δt; Among them, α is the number coefficient set artificially, which is a constant; N is the number of circuit conduction times per unit time; β is the time coefficient set artificially, which is a constant; Δt is the interval time between two circuit conductions; Hairiness winding usually shows multiple periodic triggers, while joints are usually single triggers; through such a design, the formula will give a higher score to multiple triggers through α•N, facilitating the distinction between hairiness winding and joints; the trigger interval of hairiness winding is usually short and regular, while the interval time Δt of joints or other interferences is irregular; the formula gives a higher score to triggers within a short interval through β / Δt, further strengthening the identification of hairiness winding with periodic characteristics; on this basis, a threshold Py can be preset according to historical data or human experience. When P≥Py, it is determined as hairiness winding, otherwise it is determined as a joint or other interference, and then the joint or other interference can be distinguished; because hairiness winding is the largest interference item when detecting joints, only hairiness winding is described separately, and other interferences can be analyzed specifically.

[0039] In some embodiments of the present invention, in step S40, thickness correction is also included during twisting for the comprehensive score P: Establish Ph = P•(1 - γ•Tj / Tb); Among them, Ph is the comprehensive score after thickness correction; γ is the thickness correction coefficient set artificially, which is a constant; Tj is the twisting thickness of the carbon fiber yarn.

[0040] In textile and fiber manufacturing, the twisting process refers to the process of imparting twist to fibers or yarns through mechanical rotation, aiming to change their physical structure, enhance performance, or meet specific application requirements; in carbon fiber production, the twisting process specifically refers to the process of rotating multiple fibers or a single yarn along the axial direction to form a helical structure; the periodic thickness change of the twisted yarn may be misjudged as the regular trigger of hairiness entanglement, or it may also cause the distance between the contact 22 and the yarn to become smaller due to the increased thickness of the twisted yarn, resulting in the yarn constantly colliding with the contact 22 and causing the circuit to conduct, so that the joints that should have been detected cannot be detected; therefore, it is necessary to correct the thickness of the comprehensive score of carbon fiber yarns when there is a twisting process.

[0041] The ratio of the twisting thickness Tj to the standard thickness Tb reflects the relative amplitude of the thickness change. Adding this amplitude to the formula and then performing linear correction reduces the original comprehensive score P. Such a formula is simple to calculate, does not require strong computing power, and reduces costs; when comparing with the preset threshold py in this way, the influence of the twisting thickness on the reduction of the distance between the yarn and the fixed wheel is reduced, and the detection errors or missed detection rates that may be caused by the thickness are removed. In some embodiments of the present invention, it further includes: S50: Generate a yarn judgment result according to the yarn condition, send a shearing signal for the yarn belonging to the carbon fiber joint, and send a cleaning signal for the yarn belonging to the hairiness entanglement, which can timely allow the staff to clean the hairiness, reduce the wear of the equipment caused by the hairiness entanglement, extend the equipment life, and reduce the maintenance cost; on the basis of this embodiment, a shearing mechanism can also be added to the production line, which can quickly shear and rewind after receiving the shearing signal to realize the continuous operation of the production line.

[0042] Those skilled in the art 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 contact joint detection system, characterized in that, Including: A box body (1) connected to an external production line; A triggering mechanism (2), including a reed (21) with one end fixedly connected to the box body (1), a contact head (22) arranged on the reed (21), and a contact pin (23) arranged on the other end of the reed (21); the contact head (22) is fixed on the reed (21) through a fixed point, and a plurality of fixed points are arranged along the length direction of the reed (21); A circuit mechanism (3), including a circuit negative electrode (31) connected to the fixed end of the reed (21), a contact point (32) arranged opposite to the contact pin (23) with a set distance, a resistor (33) connected to the contact point (32), and a circuit positive electrode (34) connected to the other end of the resistor (33); Wherein, the contact pin (23) can approach or move away from the contact point (32). When the contact pin (23) contacts the contact point (32), the circuit is turned on. When the contact pin (23) moves away from the contact point (32), the circuit is turned off.

2. The carbon fiber contact joint detection system according to claim 1, characterized in that It further includes a feedback mechanism communicated with the circuit mechanism (3); The feedback mechanism includes a detector for detecting the circuit state in the circuit mechanism (3); A counter for recording the number of times the circuit is turned on; A timer for recording the time between two adjacent circuit turn-ons.

3. The carbon fiber contact joint detection system according to claim 1, wherein, It further includes a positioning rod (4) on the same side as the contact head (22) relative to the reed (21), with one end fixedly connected to the box body (1) and the other end extending along the width direction of the reed (21) to contact the reed (21).

4. The carbon fiber contact joint detection system according to claim 1, characterized in that A rotating shaft (11) is arranged at one end of the box body (1), and the rotating shaft (11) is fixedly connected to the external production line; the box body (1) rotates around the axis of the rotating shaft (11); a plug hole (12) is arranged at the other end of the box body (1).

5. The carbon fiber contact joint detection system according to claim 1, characterized in that, It further includes a controller for controlling the start and stop of the detection system.

6. A detection method for carbon fiber contact joints, characterized in that, Including the following steps: S10: One end of the box body (1) is rotatably arranged on the external production line through the rotating shaft (11), and the box body (1) is fixed on the external production line by inserting a plug rod into the plug hole (12); S20: Adjust the position of the contact head (22) relative to the fixed pulley in the external production line according to the thickness of the carbon fiber yarn; S30: Start the external production line to drive the carbon fiber to move forward, detect the circuit state of the circuit mechanism (3), and generate a circuit state result; S40: According to the circuit state result, calculate the comprehensive score P, and judge the yarn condition of the carbon fiber through the comprehensive score P.

7. The carbon fiber contact joint detection method according to claim 6, wherein In step S20, adjusting the position of the contact head (22) relative to the fixed pulley in the external production line is specifically: Calculate D = D0 + k • (Ts - Tb); Wherein, D is the actual distance from the contact head (22) to the fixed pulley; D0 is the initial distance from the contact head (22) to the fixed pulley set artificially; k is the adjustment coefficient set artificially and is a constant; Ts is the actual thickness of the carbon fiber yarn; Tb is the standard thickness of the carbon fiber yarn.

8. The carbon fiber contact joint detection method according to claim 6, characterized in that, In step S40, calculating the comprehensive score P is specifically: Construct P = α • N + β / Δt; Wherein, α is a manually set number coefficient, which is a constant; N is the number of circuit conduction times per unit time; β is a manually set time coefficient, which is a constant; and Δt is the interval time between two circuit conductions.

9. The carbon fiber contact joint detection method according to claim 8, characterized in that, Step S40 also includes performing thickness correction on the comprehensive score P during twisting: Establish Ph = P • (1 - γ • Tj / Tb); Wherein, Ph is the comprehensive score after thickness correction; γ is a manually set thickness correction coefficient, which is a constant; and Tj is the twisting thickness of the carbon fiber yarn.

10. The carbon fiber contact joint detection method according to claim 6, characterized in that, It also includes: S50: Generate a yarn judgment result according to the yarn condition, send a shearing signal for the yarn belonging to the carbon fiber joint, and send a cleaning signal for the yarn belonging to the hairiness entanglement.

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