A carbon fiber cloth automatic deviation detection and correction device and control method thereof

Abstract

The invention discloses an automatic deflection detection and correction device for carbon fiber cloth and a control method thereof. The invention utilizes an optical fiber sensor to detect the deflection of the carbon fiber cloth, thereby reducing the cost. At the same time, a color sensor is provided to determine, based on information from the color sensor, that the optical fiber sensor detects the carbon fiber cloth, rather than other foreign matter, thereby eliminating the possibility of misjudgment and improving reliability. Based on the deflection detection result, the carbon fiber cloth is corrected by a grabbing structure driven by a telescopic structure, thereby avoiding the disadvantages of a traditional mechanical deflection correction device.

Description

Technical Field

[0001] The invention belongs to the technical field of deflection correction devices, and in particular relates to an automatic deflection correction device for carbon fiber cloth and a control method thereof. Background Art

[0002] Carbon fiber has a high carbon content and is a fibrous material with excellent properties such as high temperature resistance, corrosion resistance, and friction resistance. It is urgent to develop the carbon fiber manufacturing industry and master the core technology of carbon fiber manufacturing. In the carbon fiber cloth extrusion process production line, carbon fiber needs to go through resin tank infiltration, preforming, heating and curing, pulling, cutting and other processes to produce carbon fiber cloth. However, the following problems often occur in actual engineering applications. In the carbon fiber cloth extrusion process production line, the preformed carbon fiber cloth may deviate to the left or right during the transmission process before entering the heating and curing mold, resulting in cloth jam.

[0003] Traditional correction devices, such as mechanical correction devices, when the carbon fiber cloth deviates, the axis of the correction device roller deviates around the rotation center in the corresponding direction by a certain angle, thereby generating a lateral friction force perpendicular to the running direction of the carbon fiber cloth between the roller and the carbon fiber cloth, so that the carbon fiber cloth returns to the correct position; the image-based intelligent correction system is based on visual detection and uses image recognition technology to monitor and adjust the deviation of the carbon fiber cloth during operation, etc.

[0004] The inventors found that traditional correction devices have the following disadvantages: the correction ability of mechanical correction devices will be significantly reduced as the deviation of carbon fiber cloth increases, and the reliability is low, so sometimes manual correction is required, and the real-time performance is poor; mechanical correction devices have strict requirements on the quality of transmission rollers and are costly; the image recognition technology used in the image-based intelligent correction system requires a CCD camera system and a high-performance processor, which is costly; the intelligent correction system based on infrared sensors is easily affected by ambient light, which can easily cause system misjudgment and has poor reliability. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes an automatic deflection detection and correction device for carbon fiber cloth and a control method thereof. The present invention utilizes an optical fiber sensor to detect the deflection of the carbon fiber cloth, thereby reducing the cost. At the same time, a color sensor is equipped to determine, based on the information of the color sensor, that the optical fiber sensor detects the carbon fiber cloth, rather than other foreign matter, thereby eliminating the possibility of misjudgment and improving reliability. Based on the deflection detection result, the carbon fiber cloth is corrected by a grabbing structure driven by a telescopic structure, thereby avoiding the shortcomings of a traditional mechanical deflection correction device.

[0006] In order to achieve the above-mentioned purpose, in the first aspect, the present invention proposes a carbon fiber cloth automatic deviation detection and correction device, which adopts the following technical scheme:

[0007] A carbon fiber cloth automatic deviation detection and correction device, comprising:

[0008] A first control host and a second control host are symmetrically arranged on both sides of the carbon fiber cloth;

[0009] On the first control host and the second control host, fixing rods for installing optical fiber sensors are fixed at the upper and lower sides of the carbon fiber cloth;

[0010] A light emitter array and a color sensor are installed on the fixing rod located on the upper side of the carbon fiber cloth; a plurality of first light detectors and a plurality of second light detectors are installed on the fixing rod located on the lower side of the carbon fiber cloth; the light beam emitted by the light emitter array is equal to the width of the carbon fiber cloth; the vertical downward projection of the carbon fiber cloth covers the first light detector, and the edge coincides with the edge of the first light detector; the vertical downward projection of the carbon fiber cloth does not cover the second light detector, and the edge coincides with the edge of the second light detector;

[0011] A telescopic structure is vertically fixed on both the first control host and the second control host, and a grabbing structure for clamping the carbon fiber cloth is installed on the telescopic structure.

[0012] Further, the light emitter array is vertically aligned with the first light detector and the second light detector.

[0013] Furthermore, when the carbon fiber cloth deviates, at least the first light detector receives the light signal; when the carbon fiber cloth deviates, at least one second light detector does not receive the light signal.

[0014] Furthermore, the telescopic structure is a DC push-pull rod, and the grasping structure is a mechanical claw.

[0015] Furthermore, the DC motor in the DC push-pull rod is an H-bridge drive circuit.

[0016] Furthermore, the optical fiber sensor is driven by square wave pulses.

[0017] Furthermore, the signal transceiver channel of the optical fiber sensor is provided with a switch which is controlled by the main control module, and the switch is closed only when transmitting or receiving signals.

[0018] Furthermore, the first control host and the second control host are provided with a main control module, a driving circuit module, a detection circuit module, an execution circuit module and a communication circuit module;

[0019] The transmitting switch between the main control module and the optical transmitter includes a waveform generator, a programmable amplifier, a voltage follower, a voltage-to-current converter, an emitter follower, a short-circuit protector and a switch;

[0020] A switch, a current-to-voltage converter, a differential amplifier, a programmable amplifier, a voltage comparator, a smoothing capacitor and a TTL level converter are arranged between the first light detector, the second light detector and the main control module.

[0021] Furthermore, the color sensor is used to determine whether the fiber optic sensor detects carbon fiber cloth, thereby eliminating misjudgment.

[0022] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also proposes a control method for an automatic deviation detection and correction device for carbon fiber cloth, which adopts the following technical scheme:

[0023] A control method for an automatic deflection correction device for carbon fiber cloth, using the automatic deflection correction device for carbon fiber cloth as described in the first aspect, comprising:

[0024] When the carbon fiber cloth deviates, the first light detector receives the light signal, while the second light detector does not receive the light signal; the main control module determines whether the fiber optic sensor detects the carbon fiber cloth based on the information of the color sensor, thereby eliminating misjudgment;

[0025] The main control module drives the DC push-pull rod and mechanical claws to clamp the carbon fiber cloth and pull it back.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention utilizes an optical fiber sensor to detect the deflection of the carbon fiber cloth, thereby reducing the cost. At the same time, a color sensor is equipped to determine that the optical fiber sensor detects the carbon fiber cloth, rather than other foreign matter, based on the information of the color sensor, thereby eliminating the possibility of misjudgment and improving reliability. Based on the deflection detection result, the carbon fiber cloth is corrected by a grabbing structure driven by a telescopic structure, thereby avoiding the shortcomings of a traditional mechanical deflection correction device.

[0028] 2. The present invention can complete the detection and correction by using an optical fiber sensor and a low-performance processor, which greatly saves costs;

[0029] 3. The optical fiber sensor of the present invention is driven by square wave pulses; the signal transceiver channel is provided with a switch, which is controlled by the main control module and is closed only when the signal is transmitted and received; the detection circuit module is provided with a differential signal input; and a color sensor is used to assist in deflection detection, so that the detection result will not be affected by ambient light or foreign matter in the production line, and the anti-interference ability is strong;

[0030] 4. The present invention performs program-controlled amplification, smoothing and TTL level conversion on the received signal, and flexibly adjusts the reference voltage value of the voltage comparator and the number, arrangement and radial extension distance of the optical fiber sensor array according to different sites, and the detection speed is accurate and fast;

[0031] 5. The correction method of using a DC push-pull rod to connect the mechanical claw can quickly pull the carbon fiber cloth back once deviation is detected. When the main control module determines that the carbon fiber cloth is back to the right position, the DC push-pull rod and the mechanical claw stop moving, and the deviation correction capability is stable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0033] Figure 1 This is a schematic diagram of a carbon fiber cloth extrusion process production line according to Example 1 of the present invention;

[0034] Figure 2 The system structure of the automatic deflection detection and correction device for carbon fiber cloth according to embodiment 1 of the present invention;

[0035] Figure 3 This is a system block diagram of the deviation correction device according to Embodiment 1 of the present invention;

[0036] Figure 4 This is a typical connection method of XTR111 in Example 1 of the present invention;

[0037] Figure 5 The post-processing circuit of Embodiment 1 of the present invention;

[0038] Among them, 1. carbon fiber, 2. first surface material, 3. resin tank, 4. heat curing mold, 5. traction device, 6. cutting device, 7. second surface material, 8. DC push-pull rod, 9. mechanical claw, 10. light emitter, 11. color sensor, 12. fixing rod, 13. carbon fiber cloth, 14. first light detector, 15. second light detector, 16. communication line, 17. first control host, 18. second control host. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Explanation of professional terms:

[0041] Fiber optic sensor: Fiber optic sensor is a type of photoelectric sensor. It uses the light emitted by a light-emitting tube or a laser tube to transmit it to the object to be detected through the optical fiber. After the detection signal is modulated, it is reflected multiple times along the optical fiber and sent to the photodetector. After demodulation, it is converted into an electrical signal.

[0042] Color sensor: A color sensor is also called a color recognition sensor or a color sensor. It detects color by comparing the color of an object with a previously taught reference color. When the two colors match within a certain error range, the detection result is output.

[0043] Embodiment 1:

[0044] like Figure 1 As shown, it shows a carbon fiber cloth extrusion process production line. The carbon fiber needs to go through the processes of resin tank 3 impregnation, preforming, heating and curing of heating and curing mold 4, traction by traction device 5, cutting by cutting device 6, etc., to produce carbon fiber cloth; however, the following problems often occur in actual engineering applications. On the carbon fiber cloth extrusion process production line, the preformed carbon fiber cloth may deviate to the left or right during the transmission process before entering the heating and curing mold, resulting in cloth jamming.

[0045] In order to solve the problem of automatic deflection detection and correction of carbon fiber cloth, this embodiment provides an automatic deflection detection and correction device for carbon fiber cloth, comprising:

[0046] A first control host 17 and a second control host 18 are symmetrically arranged on the left and right sides of the carbon fiber cloth 13;

[0047] On the first control host 17 and the second control host 18, fixing rods 12 for installing optical fiber sensors are fixed at the upper and lower sides of the carbon fiber cloth 13;

[0048] An array of light emitters 10 and a color sensor 11 are installed on the fixing rod located on the upper side of the carbon fiber cloth; a plurality of first light detectors 14 and a plurality of second light detectors 15 are installed on the fixing rod located on the lower side of the carbon fiber cloth; the light beam emitted by the array of light emitters 10 is equal to the width of the carbon fiber cloth 13; the vertical downward projection of the carbon fiber cloth 13 covers the first light detector 14, and the edge coincides with the edge of the first light detector 14; the vertical downward projection of the carbon fiber cloth 13 does not cover the second light detector 15, and the edge coincides with the edge of the second light detector 15;

[0049] A telescopic structure is vertically fixed on both the first control host 18 and the second control host 18 , and a gripping structure for clamping the carbon fiber cloth is installed on the telescopic structure.

[0050] Specifically, the automatic deviation detection and correction device for carbon fiber cloth is composed of two deviation correction devices on the left and right, each of which includes a control host, a DC push-pull rod, a mechanical claw, a light emitter 10, a first light detector 17, a second light detector 18, a color sensor 11 and a fixing rod 12. The two deviation correction devices are connected in the middle by a communication line 16, and each deviation correction device has a fixing 12 on the upper and lower sides for fixing the sensor array. The light emitter 10 should be vertically aligned with the first light detector. When the carbon fiber cloth 13 deviates, the first light detector 14 can receive the light signal emitted by the light emitter 10; the second light detector 15 should be installed next to the first light detector 14, and the second light detector 15 should receive the same amount of ambient light as the first light detector 14, and when the carbon fiber cloth 13 deviates, the second light detector 15 cannot receive the light signal emitted by the light emitter 10; in the middle of the deviation correction device is an action module composed of a DC push-pull rod 8 and a mechanical claw 9, the carbon fiber cloth 13 and the center of the mechanical claw 9 are kept on a horizontal plane, and the DC push-pull rod 8 is fixed on the housing of the control host.

[0051] Fiber optic sensor is a type of photoelectric sensor. It uses the light emitted by the light emitter (such as light emitting tube, laser tube) to transmit to the detected object through the optical fiber. After the detected signal is modulated, it is reflected multiple times along the optical fiber and sent to the light detector (such as photosensitive tube). After demodulation, it becomes an electrical signal. The fiber optic sensor is composed of optical fiber, light emitter, and light detector. The light emitter is a current-driven device, which requires the circuit to have a strong load capacity. The more light the light detector receives, the greater the current signal. Using this feature, the carbon fiber cloth can be used to block the amount of light signal emitted by the light emitter to determine whether the carbon fiber cloth is deviated. Optical signals have the advantages of strong anti-interference ability, high sensitivity, and electrical insulation. Therefore, the use of optical signals is very suitable for bias detection.

[0052] like Figure 3 As shown, the control host is composed of a main control module, a drive circuit module, a detection circuit module, an execution circuit module and a communication circuit module; the sensor array is composed of an optical fiber sensor array and a color sensor 11, wherein the optical fiber sensor array is composed of a light emitter 10, a first light detector 14 and a second light detector 15; the action module is composed of a DC push-pull rod 8 and a mechanical claw 9.

[0053] The working process is as follows: first, the waveform generation module of the driving circuit module sends a square wave pulse signal of a specific frequency as an excitation signal, and the frequency is regulated by the main control module, thereby realizing precise control of the driving current of the optical fiber sensor. The driving current can be flexibly adjusted to cope with different environments, making the device more stable and universal; the excitation signal passes through the process control amplification module to obtain the required waveform, and the voltage gain is flexibly adjusted by the main control module according to different needs; the voltage follower plays a role of buffering and isolation, and can improve the load capacity; after the excitation signal passes through the voltage-current conversion module, the voltage signal is linearly converted into a current signal. For example, the current output chip XTR111 can be used, and its typical connection method is as follows Figure 4 As shown. The emitter follower can further improve the load capacity; short-circuit protection can effectively protect the circuit when a short-circuit fault occurs; the transmission channel switch is controlled by the main control module, and the switch is closed only when the signal is transmitted, which can further reduce the interference caused by ambient light. The emitted excitation signal drives the optical transmitter 10 of the optical fiber sensor to emit a light signal, and the light signal is irradiated onto the carbon fiber cloth 13. When the carbon fiber cloth 13 deviates, the first light detector can receive the light signal emitted by the light transmitter 10.

[0054] The optical detector of the optical fiber sensor receives the optical signal and converts it into a current signal; at this time, the optical signal, after being modulated by the detected object, contains information on whether the carbon fiber cloth 13 is deviated, and the converted current signal also retains this information; the receiving channel switch is also controlled by the main control module, and is closed only when the main control module sends a signal, which can further weaken the interference caused by ambient light; the current signal is converted linearly into a voltage signal through current-voltage conversion; the voltage signal is differentially amplified to eliminate the voltage signal generated by the ambient light, and only the voltage signal generated by the light emitted by the optical transmitter is retained to shield the interference caused by the ambient light; the voltage signal is then program-controlled amplified to facilitate comparison processing by the subsequent circuit; the input signal is amplified in two stages and then handed over to the subsequent circuit for processing, and the subsequent circuit is as follows Figure 5 As shown. After the voltage comparator, it is compared with the preset reference voltage. If it exceeds the reference voltage, it means that the received light signal is sufficient and there is an output signal; if it is lower than the reference voltage, it means that the light signal is weak; there is no output signal (the voltage comparator uses a single power supply); the voltage signal output by the voltage comparator passes through the smoothing capacitor and becomes a more stable DC signal; finally, it passes through the TTL level conversion module and the transistor switch circuit. When the signal smoothing capacitor has a voltage output, it means that the received light signal is sufficient, the transistor is turned on, and the output is a low level; otherwise, the transistor is turned off and the output is a high level. Therefore, through the TTL level signal, it can be quickly determined whether the carbon fiber cloth is deviated; in addition, the main control module must also determine that the optical fiber sensor detects the carbon fiber cloth, not other foreign matter, based on the information of the color sensor 11, to eliminate the possibility of misjudgment.

[0055] If the carbon fiber cloth 13 is determined to be deviated, the execution circuit module and the communication circuit module of the main control module start working; first, the main control module checks the working status of the other correction device through the communication circuit. If the other correction device is in an idle state, a working status signal is sent; the isolation circuit isolates the zero potential reference points of the two devices, so that the two can work independently and stably; then the main control module drives the DC push-pull rod 8 and the mechanical claw 9 to clamp the carbon fiber cloth and pull it back, and the DC motor in the DC push-pull rod can be driven by the H-bridge drive circuit; until the main control module determines that the carbon fiber cloth 13 is back to the right position, the DC push-pull rod 8 and the mechanical claw 9 stop moving, and the correction capability is stable and efficient.

[0056] The driving part of the device uses a programmable amplifier circuit with adjustable gain. The main control module controls the gain of the generated waveform, thereby achieving precise control of the driving current of the optical fiber sensor. The driving current can be flexibly adjusted to cope with different environments, making the device more stable and universal. Voltage followers and emitter followers are used to improve the load capacity.

[0057] In terms of shielding interference signals, the optical fiber sensor is driven by square wave pulses; the signal receiving and transmitting channel is provided with a switch, which is controlled by the main control module, and the switch is closed only when transmitting and receiving signals; the detection circuit module is provided with a differential signal input; and the color sensor 11 is used to assist in deflection detection, so the detection results will not be affected by ambient light or foreign matter in the production line, and the anti-interference ability is strong.

[0058] The detection part of the device performs program-controlled amplification, smoothing and TTL level conversion on the received signal, and flexibly adjusts the reference voltage value of the voltage comparator and the number, arrangement and radial extension distance of the optical fiber sensor array according to different sites, so that the main control module can accurately and quickly determine whether the carbon fiber cloth 13 is deviated.

[0059] The action module of the device uses a correction method of connecting a DC push-pull rod to a mechanical claw 9. Once deviation is detected, it can quickly pull the carbon fiber cloth 13 back until the main control module determines that the carbon fiber cloth 13 is straightened. Then the DC push-pull rod 8 and the mechanical claw 9 stop moving, and the deviation correction capability is stable and efficient.

[0060] The waveform generation module may use a digital frequency synthesizer or an analog / digital chip.

[0061] The programmable amplifier module can be implemented using other amplifiers with adjustable gain.

[0062] The color sensor 11 is used to assist in deflection detection, and may also be assisted by an ultrasonic distance measuring sensor or other sensors.

[0063] Dual device communication is isolated using relays, or implemented using optocouplers or other isolation switches.

[0064] Dual-device communication does not necessarily require wired transmission; wireless transmission (such as Bluetooth) can also be used to achieve communication.

[0065] The H-bridge drive circuit used by the DC push-pull rod can also use other solutions to achieve forward and reverse rotation of the motor, such as using relays.

[0066] In the automatic deflection correction device for carbon fiber cloth of this embodiment, the optical fiber sensor is driven by square wave pulses; the signal transceiver channel is provided with a switch, which is controlled by the main control module, and the switch is closed only when the signal is received and sent; the detection circuit module is provided with a differential signal input; and the color sensor 11 is used to assist in deflection correction, so that the detection result will not be affected by ambient light or foreign matter in the production line, and the anti-interference ability is strong. The received signal is program-controlled to be amplified, smoothed and converted to TTL level, and the reference voltage value of the voltage comparator and the number, arrangement and radial extension distance of the optical fiber sensor array are flexibly adjusted according to different sites, so that the main control module can accurately and quickly determine whether the carbon fiber cloth is deviated. The correction method using a DC push-pull rod to connect a mechanical claw, once the deviation is detected, the carbon fiber cloth can be quickly pulled back until the main control module determines that the carbon fiber cloth is back to the right position, and the DC push-pull rod and the mechanical claw stop moving, and the deviation correction ability is stable and efficient.

[0067] Embodiment 2:

[0068] This embodiment provides a control method for an automatic deflection detection and correction device for carbon fiber cloth, which uses the automatic deflection detection and correction device for carbon fiber cloth as described in Example 1, including:

[0069] When the carbon fiber cloth deviates, the first light detector receives the light signal, while the second light detector does not receive the light signal; the main control module determines whether the fiber optic sensor detects the carbon fiber cloth based on the information of the color sensor 11, thereby eliminating misjudgment;

[0070] The main control module drives the DC push-pull rod and mechanical claws to clamp the carbon fiber cloth and pull it back.

[0071] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A carbon fiber cloth automatic deviation correction device, It is characterized in that include: A first control host and a second control host are symmetrically arranged on both sides of the carbon fiber cloth; On the first control host and the second control host, fixing rods for installing optical fiber sensors are fixed at the upper and lower sides of the carbon fiber cloth; A light emitter array and a color sensor are installed on the fixing rod located on the upper side of the carbon fiber cloth; a plurality of first light detectors and a plurality of second light detectors are installed on the fixing rod located on the lower side of the carbon fiber cloth; the light beam emitted by the light emitter array is equal to the width of the carbon fiber cloth; the vertical downward projection of the carbon fiber cloth covers the first light detector, and the edge coincides with the edge of the first light detector; the vertical downward projection of the carbon fiber cloth does not cover the second light detector, and the edge coincides with the edge of the second light detector; A telescopic structure is vertically fixed on both the first control host and the second control host, and a gripping structure for clamping the carbon fiber cloth is installed on the telescopic structure; An array of light emitters is vertically aligned with the first light detector and the second light detector.

2. The automatic deviation detection and correction device for carbon fiber cloth according to claim 1, It is characterized in that When the carbon fiber cloth deviates, at least the first light detector receives the light signal; when the carbon fiber cloth deviates, at least one second light detector does not receive the light signal.

3. The automatic deviation detection and correction device for carbon fiber cloth according to claim 1, It is characterized in that The telescopic structure is a DC push-pull rod, and the grasping structure is a mechanical claw.

4. The automatic deviation detection and correction device for carbon fiber cloth as claimed in claim 3, It is characterized in that The DC motor in the DC push-pull rod is an H-bridge drive circuit.

5. The automatic deviation detection and correction device for carbon fiber cloth according to claim 1, It is characterized in that The optical fiber sensor is driven by square wave pulses.

6. The automatic deviation detection and correction device for carbon fiber cloth according to claim 1, It is characterized in that The signal receiving and sending channel of the optical fiber sensor is provided with a switch which is controlled by the main control module and is closed only when the signal is being sent and received.

7. The automatic deviation detection and correction device for carbon fiber cloth according to claim 1, It is characterized in that The first control host and the second control host are provided with a main control module, a driving circuit module, a detection circuit module, an execution circuit module and a communication circuit module; The transmitting switch between the main control module and the optical transmitter includes a waveform generator, a programmable amplifier, a voltage follower, a voltage-to-current converter, an emitter follower, a short-circuit protector and a switch; A switch, a current-to-voltage converter, a differential amplifier, a programmable amplifier, a voltage comparator, a smoothing capacitor and a TTL level converter are arranged between the first light detector, the second light detector and the main control module.

8. The automatic deviation detection and correction device for carbon fiber cloth according to claim 1, It is characterized in that The color sensor is used to determine whether the fiber optic sensor detects carbon fiber cloth to eliminate misjudgment.

9. A control method for an automatic deviation correction device for carbon fiber cloth, It is characterized in that The carbon fiber cloth automatic deviation detection and correction device according to any one of claims 1 to 8 is adopted, comprising: When the carbon fiber cloth deviates, the first light detector receives the light signal, while the second light detector does not receive the light signal; the main control module determines whether the fiber optic sensor detects the carbon fiber cloth based on the information of the color sensor, thereby eliminating misjudgment; The main control module drives the DC push-pull rod and mechanical claws to clamp the carbon fiber cloth and pull it back.

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