A poly-position aramid fiber spinning air gap layer regulating device based on visual detection

Abstract

The utility model provides a kind of based on visual inspection's alignment aramid fiber spinning multi-spindle air gap layer regulation and control device, comprising: rack;Multiple coagulation bath accelerators are respectively correspondingly set in each spinning spindle position;Lifting mechanism is connected with coagulation bath accelerator, for driving its lifting movement;Laser range finder camera is used to detect the height of air gap layer between each spinning spindle position coagulation bath liquid level and spinneret;Moving mechanism, laser range finder camera is set on the moving mechanism, and it is moved between each spinning spindle position by the moving mechanism;Servo drive mechanism is used to drive lifting mechanism;Central controller is used to receive the detection data of laser range finder camera, and compare with preset height value, when deviation exceeds allowable range, drive lifting mechanism and coagulation bath accelerator movement to adjust air gap layer height.The utility model realizes the intelligent monitoring and automatic adjustment to multi-spindle air gap layer height, and enhances the intelligence and security.

Description

Technical Field

[0001] This utility model relates to the field of aramid spinning production technology, specifically to a visual inspection-based device for regulating the air gap layer of multi-spindle aramid spinning. Background Technology

[0002] In aramid spinning, the air gap layer is a crucial transition region between the spinneret and the coagulation bath accelerator. Located between the spinneret and the coagulation bath (typically 1–15 mm), the air gap layer first generates a liquid crystal solution jet as the fiber passes through it. High-stretching and molecular chain orientation occur within the air gap, forming a highly ordered liquid crystal structure. Secondly, the solvent in the fiber rapidly evaporates, allowing the molecular chains to complete pre-orientation before coagulation, directly affecting the fiber's crystallinity and orientation. Uneven air gaps lead to differences in the fiber's core-sheath structure, significantly reducing strength uniformity. In the large-scale production of para-aramid products with performance dispersion, differences in air gap layer height are the main cause of fiber strength dispersion; precise control of air gap consistency can significantly reduce strength fluctuations.

[0003] In existing technologies, air gap layer control mainly relies on manual adjustment or traditional mechanical positioning devices, which has the following drawbacks: 1. Low detection accuracy: Traditional methods (such as visual inspection or mechanical contact measurement) are easily affected by environmental interference and operational errors, resulting in large fluctuations in the air gap spacing and significant dispersion in fiber properties.

[0004] 2. Slow positioning response: Existing positioning devices mostly use mechanical transmission, which has insufficient response speed and makes it difficult to adjust the distance between the spinneret and the coagulation bath in real time, affecting the uniformity of the fiber structure.

[0005] 3. Low level of automation: Frequent manual intervention limits production efficiency and poses safety hazards in high-temperature and corrosive environments.

[0006] 4. Poor uniformity of air gap layer among multiple spindles: Under visual inspection or mechanical contact measurement, the height error of air gap layer is large at different spindle positions, and it is difficult to achieve unified real-time control of different spindle positions.

[0007] For example, Chinese utility model patent CN215925157U discloses a device for automatically adjusting the air layer height. This device includes a laser rangefinder mounted on a spinneret to detect the height of the spinneret from the surface of the coagulation bath. A floating object is placed on the coagulation bath and aligned with the laser rangefinder to provide feedback on the distance between the spinneret and the liquid surface. A PLC controller receives the signal from the laser rangefinder, compares it with a set value, and sends a signal to drive a motor. This device uses the laser rangefinder to detect the distance between the spinneret and the floating object and feeds it back to the PLC controller, adjusting the air layer height by adjusting the height of the spinneret. However, this device indirectly reflects the liquid level height by measuring the distance to the "floating object," and the measurement accuracy heavily depends on whether the floating object can consistently and accurately float with the liquid surface. In actual production, the coagulation bath surface may fluctuate, turbulent, or contain foam, easily causing the floating object to drift, tilt, or even sink, thus introducing significant measurement errors and leading to control system malfunction. Furthermore, a single floating object can only reflect the liquid level at a localized point, and the liquid level in a large coagulation bath may not be perfectly horizontal, causing the measurement value to be unable to represent the true liquid level state of the entire spinning area. Most importantly, the laser rangefinder of this device is a fixed installation "set on the spinneret," meaning that each spinning position (spindle) requires an independent laser rangefinder and floating object, which increases equipment costs, complicates wiring, and reduces economy and practicality.

[0008] Therefore, in order to ensure the stability of the para-aramid spinning process, a control system is needed that can automatically monitor and precisely adjust the air gap layer of the multi-spindle para-aramid spinning process. Utility Model Content

[0009] The purpose of this invention is to overcome the shortcomings of the prior art, to automatically monitor and precisely adjust the air gap layer of multi-spindle para-aramid spinning, to ensure the stability of the para-aramid spinning process, and to provide a vision-based device for regulating the air gap layer of multi-spindle para-aramid spinning.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A vision-based detection-based device for regulating the air gap layer of multi-spindle para-aramid spinning, comprising: frame; Multiple coagulation bath accelerators are respectively set at each spinning spindle position for spinning and forming; A lifting mechanism, installed on the frame and connected to the coagulation bath accelerator, is used to drive it to perform lifting movements; A laser rangefinder camera is used to detect the height of the air gap layer between the coagulation bath surface and the spinneret at each spinning spindle position. A moving mechanism is installed on the frame, and the laser rangefinder is set on the moving mechanism, which drives it to move between each spinning spindle position. A servo drive mechanism, connected to the lifting mechanism, is used to drive the lifting mechanism; The central controller is connected to the laser rangefinder camera, the moving mechanism, and the servo drive mechanism via signals, respectively. The central controller receives the detection data from the laser rangefinder and compares it with a preset height value. When the deviation exceeds the allowable range, it outputs a height control signal to the servo drive mechanism to drive the lifting mechanism and the solidification bath accelerator to adjust the air gap layer height.

[0011] This invention achieves automated and precise control of the air gap layer height in multi-spindle systems. Through a combination of a laser rangefinder camera and a moving mechanism, a single testing device can perform cyclic testing on multiple spinning spindles, ensuring testing accuracy while significantly reducing equipment costs. The central controller drives a servo mechanism to automatically adjust the height of the coagulation bath accelerator based on real-time testing data, solving the problems of low efficiency and poor consistency associated with traditional manual adjustments.

[0012] Preferably, the laser rangefinder camera is a range sensor based on the principle of laser triangulation.

[0013] Preferably, the moving mechanism includes a horizontally arranged guide rail, a slider that slides with the guide rail, and a motor that drives the slider to move, and the laser rangefinder is mounted on the slider.

[0014] Preferably, the lifting mechanism includes a vertically arranged lead screw, a nut that cooperates with the lead screw, and a mounting base plate. The coagulation bath accelerator is fixed on the mounting base plate, and the servo drive mechanism is a servo motor, the output shaft of which is connected to the lead screw.

[0015] Preferably, the lead screw is a ball screw, the servo motor is directly connected to the ball screw via a coupling, and the mounting base plate is slidably connected to the linear guide pair.

[0016] Preferably, there are two moving mechanisms, located on both sides of the solidification bath accelerator. Each moving mechanism is equipped with a laser rangefinder camera to measure the height of the air gap layer on its respective side. The central controller receives and processes the detection data from each laser rangefinder camera and compares the processed detection data with a preset height value.

[0017] Preferably, the laser rangefinder is provided with a protective cover, which is made of a corrosion-resistant transparent material to isolate the corrosive gases volatilized from the condensation bath.

[0018] Preferably, it also includes a light source, the controlled end of which is connected to the central controller, and the light source is used to provide illumination for the laser rangefinder camera.

[0019] Preferably, the system also includes an audible and visual alarm connected to the central controller. When the air gap layer height deviation continues to exceed the allowable range for a preset duration, or when the servo drive mechanism malfunctions, the central controller triggers the audible and visual alarm to sound an alarm.

[0020] Preferably, the central controller is equipped with an independent PID controller corresponding to each spinning spindle position, which is used to perform closed-loop control of the air gap layer height of each spindle position.

[0021] The beneficial effects of this utility model are: The use of a laser rangefinder for non-contact measurement avoids direct contact with the solidification bath surface, effectively preventing corrosion of the measuring devices and improving the stability and reliability of the detection system. The protective cover design further isolates corrosive gases, extending the equipment's lifespan. The symmetrical arrangement of dual laser rangefinders eliminates potential errors from single-point measurements, ensuring the accuracy of the detection data.

[0022] A lifting mechanism employing a ball screw and linear guide pair, combined with a servo motor drive, achieves precise vertical positioning of the solidification bath accelerator. This mechanism not only boasts high transmission efficiency and accurate positioning but also exhibits excellent rigidity and smooth operation, providing reliable mechanical assurance for stable control of the air gap height and optimizing the transmission accuracy and stability of the mechanical structure.

[0023] Closed-loop control of each spindle position is achieved through independent PID controllers, ensuring that each spinning unit maintains optimal process parameters. Audible and visual alarms promptly alert operators to abnormal situations, preventing production quality accidents. Intelligent monitoring and automatic adjustment of the air gap layer height across multiple spindle positions are implemented, enhancing both intelligence and safety.

[0024] This invention effectively solves the technical problem of controlling the air gap layer height during para-aramid spinning while maintaining low equipment costs. It provides a reliable technical means to improve product quality stability and production efficiency, and has good practicality and economy, with significant value for promotion and application. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the moving mechanism of this utility model; Figure 3 This is a schematic diagram of the lifting mechanism of this utility model.

[0026] Explanation of reference numerals in the attached figures: 1-Spinneret; 2-Coagulation bath accelerator; 3-Air gap layer; 4-First laser rangefinder camera; 5-Second laser rangefinder camera; 601-Guide rail; 602-Slider; 701-Lead screw; 702-Nut; 703-Servo motor; 704-Coupling. Detailed Implementation

[0027] like Figure 1 As shown, this utility model provides a vision-based detection-based multi-spindle air gap layer control device for para-aramid spinning, comprising: frame; Multiple coagulation bath accelerators 2 are respectively set at each spinning spindle position for spinning and forming; The lifting mechanism is installed on the frame and connected to the coagulation bath accelerator 2 to drive it to move up and down. A laser rangefinder camera is used to detect the height of the air gap layer 3 between the coagulation bath surface and the spinneret 1 at each spinning spindle position; A moving mechanism is mounted on the frame, and a laser rangefinder is mounted on the moving mechanism, which drives the camera to move between each spinning spindle position. Servo drive mechanism, connected to the lifting mechanism, is used to drive the lifting mechanism; The central controller is connected to the laser rangefinder camera, the moving mechanism, and the servo drive mechanism via signals. The central controller receives the detection data from the laser rangefinder and compares it with the preset height value. When the deviation exceeds the allowable range, it outputs a height control signal to the servo drive mechanism to drive the lifting mechanism and the solidification bath accelerator 2 to move in order to adjust the height of the air gap layer 3.

[0028] The laser rangefinder is a distance sensor based on the principle of laser triangulation. The laser rangefinder is positioned at the same horizontal height as the center of the spindle head 1. By aligning the laser rangefinder with the center of the spindle head 1, the laser rangefinder measures the distance between itself and the spindle head 1, as well as the distance between itself and the surface of the coagulation bath. Then, using the laser triangulation principle, it calculates the height of the air gap layer 3 between the surface of the coagulation bath and the spindle head 1 at each spinning spindle position. This achieves non-contact measurement, avoids direct contact with the coagulation bath surface, effectively prevents corrosion of the measuring device, and improves the stability and reliability of the detection system.

[0029] The laser rangefinder camera is equipped with a protective cover made of corrosion-resistant transparent material to isolate it from corrosive gases emitted from the condensation bath. This protective cover further isolates the corrosive gases and extends the equipment's lifespan.

[0030] like Figure 2As shown, the moving mechanism includes a horizontally arranged guide rail 601, a slider 602 that slides with the guide rail 601, and a motor that drives the slider 602 to move. A laser rangefinder camera is mounted on the slider 602. The laser rangefinder camera is fixed to the moving mechanism by a fixing rod. In this embodiment, the moving mechanism uses a synchronous belt linear module.

[0031] Two moving mechanisms are configured, located on either side of the solidification bath accelerator 2. Each moving mechanism is equipped with a laser rangefinder camera to measure the height of the air gap layer 3 on its respective side. The central controller receives and processes the detection data from each laser rangefinder camera and compares the processed data with a preset height value. The two moving mechanisms are designated as a first moving mechanism and a second moving mechanism. The first moving mechanism has a first laser rangefinder camera 4 fixed to it via a first fixed rod. The second moving mechanism has a second laser rangefinder camera 5 fixed to it via a second fixed rod. This symmetrical arrangement of the two laser rangefinder cameras eliminates potential errors from single-point measurements, ensuring the accuracy of the detection data.

[0032] like Figure 3 As shown, the lifting mechanism includes a vertically arranged lead screw 701, a nut 702 that mates with the lead screw 701, and a mounting base plate. The coagulation bath accelerator 2 is fixed on the mounting base plate. The servo drive mechanism is a servo motor 703, whose output shaft is connected to the lead screw 701. The lead screw 701 is a ball screw, and the servo motor 703 is directly connected to the ball screw via a coupling 704. The mounting base plate is slidably connected to the linear guide pair.

[0033] A lifting mechanism employing a ball screw and linear guide pair, driven by a servo motor 703, achieves precise vertical positioning of the solidification bath accelerator 2. This mechanism not only boasts high transmission efficiency and accurate positioning but also exhibits excellent rigidity and smooth operation, providing reliable mechanical assurance for the stable control of the air gap layer 3 height and optimizing the transmission accuracy and stability of the mechanical structure.

[0034] The preset height values ​​for the air gap layer 3 include a minimum height value and a maximum height value, which are 2.5 mm and 14.5 mm, respectively.

[0035] In actual production, the height of the air gap layer 3 and the stretching rate jointly determine the degree of molecular chain orientation. If the height of the air gap layer 3 is too small, the solvent evaporation is insufficient, the fiber solidifies too quickly, and the molecular chains are not fully extended, ultimately resulting in low bundle strength. If the height of the air gap layer 3 is too large, excessive jet stretching can lead to fiber breakage, or excessive solvent evaporation can cause structural defects, ultimately resulting in a decrease in bundle strength. Therefore, to ensure the stability of bundle strength, the height of the air gap layer 3 is in the range of 2.5mm-14.5mm.

[0036] It also includes a light source, the controlled end of which is connected to the central controller, and the light source is used to provide illumination for the laser rangefinder camera.

[0037] It also includes an audible and visual alarm connected to the central controller. When the height deviation of the air gap layer 3 continuously exceeds the allowable range for a preset time, or when the servo drive mechanism malfunctions, the central controller triggers the audible and visual alarm. The audible and visual alarm can promptly remind operators to handle abnormal situations and avoid production quality accidents.

[0038] The central controller is equipped with an independent PID controller corresponding to each spinning spindle position, which is used to perform closed-loop control of the air gap layer 3 height of each spindle position.

[0039] The central controller is also connected to a human-machine interface, which is used to display the real-time height of the air gap layer 3, the preset height value, and the equipment operating status of each spindle position, and is used to input control parameters.

[0040] The specific working principle of this utility model is as follows: A moving mechanism drives the laser rangefinder cameras to their respective detection positions at each spinning spindle. Upon reaching the designated position, the laser rangefinder cameras emit lasers towards both the spindle head 1 and the coagulation bath surface. By receiving the reflected light signals, the actual height of the air gap layer 3 between the coagulation bath surface and the spindle head 1 is calculated. Simultaneous measurements are performed by the first laser rangefinder camera 4 and the second laser rangefinder camera 5, respectively positioned on both sides, eliminating potential errors from single-point measurements and ensuring the accuracy of the detection data.

[0041] The laser rangefinder camera transmits the detected real-time altitude data to the central controller. The central controller compares the real-time altitude data with a preset altitude value and calculates the deviation. When the detected altitude deviation exceeds the allowable range, the central controller initiates an adjustment program.

[0042] The central controller sends a height control signal to the servo motor 703, which starts and drives the ball screw to rotate via the coupling 704. The rotational motion of the ball screw is converted into the linear motion of the nut 702, which drives the mounting plate and the solidification bath accelerator 2 fixed on it to perform vertical lifting and lowering movements. The linear guide pair ensures that the lifting and lowering process is smooth and without deviation.

[0043] Each spinning spindle has an independent PID controller that continuously monitors and adjusts the height of the air gap layer 3. By calculating the adjustment amount and speed, the height of the air gap layer 3 is precisely controlled until it stabilizes within the range required by the process. The calculation and control of the adjustment amount and speed by the PID controller is existing technology and will not be described in detail here.

[0044] The protection mechanism is activated when the following abnormal conditions are detected: the air gap layer height deviation continuously exceeds the allowable range for a preset time, the servo drive mechanism malfunctions, or the central controller communication is interrupted. In this case, the central controller immediately triggers an audible and visual alarm to alert the operator to handle the situation promptly.

[0045] The entire device achieves automatic monitoring and precise control of the height of the multi-spindle air gap layer 3 through a closed-loop control mode of "detection-comparison-adjustment-feedback", ensuring the stability of the para-aramid spinning process and the uniformity of product quality.

[0046] This invention achieves automated and precise control of the air gap layer height in multi-spindle spinning. Through a combination of a laser rangefinder camera and a moving mechanism, a single testing device can perform cyclic testing on multiple spinning spindles, ensuring testing accuracy while significantly reducing equipment costs. The central controller drives the servo mechanism to automatically adjust the height of the coagulation bath accelerator based on real-time testing data, solving the problems of low efficiency and poor consistency associated with traditional manual adjustment. Simultaneously, while maintaining low equipment costs, it effectively solves the technical challenge of air gap layer height control during para-aramid spinning, providing a reliable technical means to improve product quality stability and production efficiency. It possesses good practicality and economic benefits, and has significant value for widespread application.

[0047] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope defined in the claims.

Claims

1. A vision-based detection-based device for regulating the air gap layer of multi-spindle para-aramid spinning, characterized in that, include: frame; Multiple coagulation bath accelerators are respectively set at each spinning spindle position for spinning and forming; A lifting mechanism, installed on the frame and connected to the coagulation bath accelerator, is used to drive it to perform lifting movements; A laser rangefinder camera is used to detect the height of the air gap layer between the coagulation bath surface and the spinneret at each spinning spindle position. A moving mechanism is installed on the frame, and the laser rangefinder is set on the moving mechanism, which drives it to move between each spinning spindle position. A servo drive mechanism, connected to the lifting mechanism, is used to drive the lifting mechanism; The central controller is connected to the laser rangefinder camera, the moving mechanism, and the servo drive mechanism via signals, respectively. The central controller receives the detection data from the laser rangefinder and compares it with a preset height value. When the deviation exceeds the allowable range, it outputs a height control signal to the servo drive mechanism to drive the lifting mechanism and the solidification bath accelerator to adjust the air gap layer height.

2. The apparatus according to claim 1, characterized in that, The laser rangefinder camera is a range sensor based on the principle of laser triangulation.

3. The apparatus according to claim 1, characterized in that, The moving mechanism includes a horizontally arranged guide rail, a slider that slides with the guide rail, and a motor that drives the slider to move. The laser rangefinder camera is mounted on the slider.

4. The apparatus according to claim 1, characterized in that, The lifting mechanism includes a vertically arranged lead screw, a nut that cooperates with the lead screw, and a mounting base plate. The coagulation bath accelerator is fixed on the mounting base plate. The servo drive mechanism is a servo motor, and its output shaft is connected to the lead screw.

5. The apparatus according to claim 4, characterized in that, The lead screw is a ball screw, the servo motor is directly connected to the ball screw through a coupling, and the mounting base plate is slidably connected to the linear guide pair.

6. The apparatus according to claim 1, characterized in that, There are two moving mechanisms, located on both sides of the solidification bath accelerator. Each moving mechanism is equipped with a laser rangefinder camera to measure the height of the air gap layer on its respective side. The central controller receives and processes the detection data from each laser rangefinder camera and compares the processed detection data with a preset height value.

7. The apparatus according to claim 1, characterized in that, The laser rangefinder is equipped with a protective cover made of corrosion-resistant transparent material to isolate corrosive gases volatilized from the condensation bath.

8. The apparatus according to claim 1, characterized in that, It also includes a light source, the controlled end of which is connected to the central controller, and the light source is used to provide illumination for the laser rangefinder camera.

9. The apparatus according to claim 1, characterized in that, It also includes an audible and visual alarm connected to the central controller. When the air gap layer height deviation continues to exceed the allowable range for a preset time, or when the servo drive mechanism fails, the central controller triggers the audible and visual alarm to sound an alarm.

10. The apparatus according to claim 1, characterized in that, The central controller is equipped with an independent PID controller corresponding to each spinning spindle position, which is used to perform closed-loop control of the air gap layer height of each spindle position.

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