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中文简体The contact yarn breakage automatic stop device is a type of device widely used in early warping machines. Its basic principle is to detect yarn breakage by changing the contact state between the warp stop plate and the electrode. During normal warping, the warp tension makes the warp stop plate suspended, and the electrodes are in an open circuit state at this time; once the warp ends are broken, the warp stop plate falls due to its own weight, connects the electrodes, forms a circuit, triggers the automatic stop switch, and stops the warping machine.
This device has a simple structure, low cost, and low environmental requirements. Therefore, it is still used in some textile enterprises that are more sensitive to costs or have relatively stable environmental conditions. However, the contact yarn breakage automatic stop device also has obvious limitations. For example, flying flowers and oil stains are easily accumulated on the electrodes, resulting in poor contact, which causes false stops or missed stops. In addition, with the continuous increase in warping speed, the response speed of the contact device may not meet the needs of high-speed warping, thereby affecting production efficiency.
In order to overcome the shortcomings of the contact device, the photoelectric yarn breakage automatic stop device came into being. The device uses the principle of photoelectric conversion. The parallel light beam emitted by the transmitter is irradiated onto the receiver, and the warp yarn passes through the circular hole above the warp stop plate. When the warp yarn is not broken, the warp stop plate is suspended above the optical path, and the light beam is directly projected onto the photosensitive tube inside the receiver. The photosensitive tube converts the light signal into a high-potential signal; when the warp yarn is broken, the warp stop plate falls to block the light beam, and the photosensitive tube outputs a low-potential signal, which triggers the warping machine to stop after amplification and processing.
The photoelectric yarn breakage automatic stop device has the advantages of high sensitivity, fast response speed, and non-contact detection. It can effectively avoid the problem of false stop or missed stop caused by flying flowers and oil accumulation in the contact device. At the same time, its detection accuracy is not affected by the warping speed and is suitable for high-speed warping machines. In addition, the photoelectric device also has the characteristics of simple structure, easy installation, and low maintenance cost, so it has been widely used in modern textile enterprises.
However, the photoelectric yarn breakage automatic stop device also has certain limitations. For example, the stability of the light source and the cleanliness of the light path are required to be high, and the aging of the light source or the pollution of the light path may lead to a decrease in detection accuracy. In addition, in strong or weak light environments, the performance of the photoelectric device may be affected to a certain extent, and corresponding protective measures need to be taken.
The electrostatic induction yarn breakage automatic stop device is a device that uses the electrostatic induction phenomenon generated during the yarn running process to detect yarn breakage. The device is usually installed at the yarn introduction port of each bobbin and consists of a U-shaped porcelain device, a circuit box and other components. During warping, the yarn is tightly attached to the surface of the U-shaped groove under tension and passes at a certain speed. Static electricity is generated by friction, which induces current on the plate of the porcelain capacitor and generates voltage. Due to the jitter of the yarn during operation and the uneven surface of the yarn, the generated voltage waveform is similar to the noise voltage. The signal amplifier circuit in the circuit box amplifies, rectifies, filters and re-amplifies the noise voltage, and inputs it into the control circuit to enable the warping machine to operate normally. When the yarn breaks, this noise voltage disappears immediately, and the control circuit issues a stop command to stop the machine.
The electrostatic induction yarn breakage automatic stop device has the advantages of sensitive action and rapid response, and is particularly suitable for high-speed warping machines. The detection process does not require contact with the yarn, so it will not damage the yarn, which is conducive to maintaining the quality and performance of the yarn. In addition, the structure of the device is relatively simple, and it is easy to install and maintain. However, the electrostatic induction yarn breakage automatic stop device has high requirements for the control of workshop humidity, because excessive humidity may cause the static electricity on the U-shaped groove to weaken, thereby causing the phenomenon of unexplained parking.
With the continuous development of computer vision technology, the image sensing yarn breakage automatic stop device has gradually become a hot topic of research. The device collects and generates image data of the yarn piece through the image sensing device, and sends it to the image acquisition processing and wire breakage control device. The control device processes the received image data to find out whether there is a broken thread or heavy yarn. If a broken thread or heavy yarn is detected, the control device will control the warping machine to stop and prompt the broken thread position.
The image sensing yarn breakage automatic stop device has the advantages of high detection accuracy, strong anti-interference ability, and can realize the broken thread position prompt. Through in-depth analysis and processing of image data, the device can accurately identify the state of the yarn, including broken thread, heavy yarn, uneven thickness and other problems. The image sensing device is not affected by factors such as ambient light and humidity, and has good stability and reliability. In addition, the device can also be integrated with other intelligent systems to achieve automatic control and optimized management of the warping process.
However, there are also some challenges with the image sensing yarn breakage automatic stop device. For example, the image acquisition and processing process requires high computing power and storage resources, and has high performance requirements for hardware equipment. In addition, the cost of image sensors is relatively high, which may increase the manufacturing cost of the whole machine.
As a key component in the textile industry, the performance of the yarn breakage automatic stop device of the warping machine directly affects the operating stability and product quality of the warping machine. With the continuous development of textile technology, the yarn breakage automatic stop device is also constantly updated, from contact type to photoelectric type, electrostatic induction type, and then to image sensing type. The detection technology is constantly improving, and the detection accuracy and reliability are constantly improving.
In practical applications, the appropriate yarn breakage automatic stop device should be selected according to the specific needs of the warping machine, the working environment and the cost budget. The daily maintenance and maintenance of the device should also be strengthened, and the key components should be cleaned and inspected regularly to ensure the normal operation and detection accuracy of the device.
