Foreword
Spinning yarn is the last process in the cotton spinning mill to produce yarn. The quality, output, consumption, labor productivity and equipment productivity of this process are a comprehensive reflection of the quality of production technology and management of cotton spinning mills. Spinning quality is the key to determining the survival and development of an enterprise. The quality management of the spinning process is a highly comprehensive management work. The solution and improvement of product quality problems involve various management tasks in the workshop. The five basic managements of raw materials, equipment, processes, operations, and air conditioning in technical management are first developed around quality management.
Strengthen equipment and process management and improve product quality
1 Equipment maintenance and repair
·Cycle management
Domestic spinning equipment maintenance generally adopts a fixed cycle. The major and minor repair cycles are 4 years and 6 months. The partial maintenance (spindle calibration) cycle is based on Production status and vehicle speed are generally based on a three-month cycle. The scope of maintenance work is large, the area is wide, and the requirements for standardization and unification of components are high. Because the equipment is always in operation, the key maintenance cycle should be appropriately shortened to 8 to 12 days, with each person inspecting two vehicles per day. Shift maintenance work must be carried out quickly, and operation maintenance workers must strengthen patrol inspections, refueling inspections, and processing shutdown work to ensure that there are no empty spindles on duty, no broken cars in production, and ensure that the equipment is always in good condition. The setting of the wipe cycle is mainly to prevent the drafting and winding parts from flying and clogging, as well as the lack of oil in the roller bearings. The high resistance of the roller and apron will cause jitter and affect the product quality. The accumulation of dust on the lower apron should be removed in time to ensure the normal and flexible rotation of the apron. Generally within 15 days. When arranging maintenance plans, attention should be paid to even intervals to avoid interference from adjacent stations.
The leveling, wiping and inspection areas correspond to each other, and the work is divided and coordinated. Each takes its own responsibility and supervises each other to facilitate handover and acceptance.
·Quality inspection
In order to ensure the comprehensive quality of all maintenance work To meet the required standards, quality inspections must be carried out. To detect problems, analyze the causes, fix them in time, and keep records. The content of quality inspection should be comprehensive. In addition to the required inspection items specified in the handover technical conditions, intact technical conditions and maintenance technical conditions, it should also include the wear limit of some machine parts increased according to production needs, installation tolerances and other items related to production quality. The equipment after leveling repair must be flat (level, flat, flush), accurate (installation specifications are accurate, spacing is accurate), stable (operating smoothly, vibration is small), tight (contact surface is tight, screws are tightened), and smooth. (channels and contact surfaces are smooth), straight (vertical, straight without bends), light (turning briskly, and the car body is brisk), flexible (flexible movement, flexible shaking) and craftsmanship, safe production, satisfactory operation, and no mechanical breakdown. , No responsibility for defects. No dryness or oily yarn is allowed to appear after wiping. The maintenance of rubber rollers, cradle, steel rings, spindles, upper pin frames and other special parts are strictly controlled, random sampling is carried out, and inspections are carried out according to technical conditions.
·Hand-over and acceptance
For repaired equipment, large or small, Handover and acceptance must be carried out one by one. That is to say, the security department will deliver each major or minor repaired equipment to the maintenance section, which will inspect and accept it according to the “handover technical conditions”. The operation maintenance worker must inspect the front gear for abnormal noise, step heating, drum vibration, and cotton absorption. Box damage, air leakage, drafting gear bite, etc. For other machines after maintenance, such as wiping, partial maintenance, key maintenance, etc., due to their large scope and wide scope, simplified handover and acceptance procedures can generally be implemented, and the opinions of the machine operators and operation maintenance workers can be actively solicited, and the evaluation can be carried out according to the unified technical conditions.
2 Carry out equipment transformation and improve the spinning quality of the equipment
Pair of spinning drafting devices Quality levels such as yarn evenness, yarn defects, and single yarn strength have a great impact. Therefore, the transformation of spinning equipment should mainly focus on the transformation of drafting devices. How to improve the quality of spinning yarn drafting involves the structure of the input product, drafting type, drafting pressure, drafting elements, manufacturing and processing accuracy of drafting transmission, assembly accuracy, and the quality of the equipment used in the drafting part. Selection of performance, matching of spinning process, etc. The performance and quality of the drafting element itself have a close relationship with the drafting uniformity and yarn quality during the spinning process.
3 Use special spinning equipment to stabilize product quality
Encountered some products during production For problems with poor quality, it is often necessary to find the cause in the spinning equipment. For example: when the spun yarn is not evenly dry, the first thing to do is to check whether there is any problem with the rubber roller; when the spun yarn has a high breakage rate and it is difficult for workers to operate, the first thing to do is to check whether there is any problem with the steel ring or wire ring. Therefore, in order to improve product quality, attention should be paid to the selection of excellent spinning equipment. The quality and performance of rubber rollers and aprons are closely related to yarn evenness, yarn strength, end breakage rate, rubber roller tangle rate and its own life. The rubber roller and the roller form a drafting and holding jaw under the action of pressure. The deformation of the rubber roller after being pressed mainly depends on the hardness. The lower the hardness, the greater the deformation. However, deformation is an instantaneous manifestation during operation. The spinning process requires that the rubber roller must be able to recover quickly after the pressure disappears, otherwise the drafting motion will run in waves along the circumferential direction. Therefore, the hardness and resilience technical indicators of the rubber roller are very important for spinning drafting, and are also an important factor for excellent spinning quality. Requirements for rubber roller hardness spinning pure cotton yarn in Shao�The idea of serving one shift creates conditions for the next shift; the successors focus on inspections and make preparations for production on the shift. It is necessary to avoid the situation where production and quality fluctuate due to the lack of communication and understanding between each shift about the production situation, so that continuous production can continue normally and stably.
2 Operation management
Employees must strictly abide by operating procedures and A unified operating method cannot be used by people in front of others and behind the scenes, let alone go their own way and become a free law, and regular inspections of implementation must be organized. Equipped with full-time trainers to measure the operating quality of lathe workers and doffing workers, analyze the advantages and disadvantages, provide on-site assistance and guidance, and point out the direction of efforts. Establish an operation technology file card to record measurement results, stand quotas and production quality completion status on a monthly (quarterly) basis. Give full play to the role of coaches and operational experts, and provide assistance and training through technical classes, master-apprentice contracts, etc., and also actively carry out weekly training, monthly measurement, quarterly exchanges, and annual summary activities to achieve institutionalized and regular change.
Holding operation competitions and using intuitive video and audio-visual education methods are also effective measures to mobilize the enthusiasm of employees, learn and promote operation experience, and generally improve the level of operation technology. Special attention should be paid to the operational technical training of new workers. New workers entering the factory must undergo a certain period of operational technical classes and basic skills training before they can be assigned to shift positions. At the same time, older workers with better ideas and skills should be designated to work with them. Establish a master-apprentice contract, carry out mentoring and mentoring, and carry out training in a planned manner. Gradually increase the quota of its stands, and only after passing the technical assessment can it be officially started to operate independently. In order to better encourage employees to step up their learning of operating techniques, the operating level of employees is linked to their salary levels. Higher-level operators have higher salary levels, while lower-level operators have lower salary levels, so that employees can consciously learn and practice operations diligently, and their technical level can be improved. Improve quickly.
Innovative management of operating methods has a great role in improving spinning quality. As the market’s requirements for gauze quality continue to increase, the operating methods of the spinners in the spinning process must also keep up with the quality needs. Organize operators and operating experts to develop the “untwisting joint method” to ensure normal production. After many analyzes and tests, it was found that the main cause of the yarn defect was the roving joint. After the cause was discovered, the operating method of spinning yarn blocking was changed. After the roving yarn was spliced, the spun yarn was interrupted and rejoined, and the yarn defects were reduced to a few yarn defects per day, which met the needs of users.
Air conditioning and management
1 Air conditioning and Management methods
According to the important impact of temperature and humidity on production quality and human health, a more suitable temperature and humidity range should be determined as the control target, and adjustment work should be strengthened to strive to control the temperature and humidity between day and night. , temperature and humidity differences between classes and regions.
When encountering climate change, it will inevitably affect the changes in temperature and humidity in the workshop. In addition, there are many people in the workshop and high mobility (especially during shift change), which will also Fluctuations in temperature and humidity are all unfavorable factors for controlling temperature and humidity. Therefore, it is necessary to regularly adjust temperature and humidity. The focus is to strengthen research and grasp the laws of climate change, improve the level of adjustment technology, make predictive adjustments, reduce fluctuations, and strive to achieve the temperature and humidity indicators required for production quality. Good air conditions required for operating workers. Achieve “two initiatives, two diligence, and two checks”. Actively observe outdoor climate changes and listen to weather forecasts; actively strengthen patrols to experience the actual conditions of temperature and humidity. Visit operating workers frequently to solicit opinions; adjust relevant air-conditioning equipment frequently so that they can play their due role in a timely and reasonable manner. Turn off the cold engine, preheat and adjust the air volume; turn off the power during power outages, and take corresponding adjustment measures.
2 To prevent and control coal ash yarn, we must do a good job in preventing and controlling coal ash yarn
First of all, we should master the rules of its production. In terms of climate change, coal ash yarn generally occurs when the atmospheric pressure is low, the air flow is slow, and the outdoor moisture content is high. Secondly, we must do a good job in the normal management of air conditioning, and adjust the relationship between the fresh air from the outside, the return air from the cotton suction and the return air from the workshop. When smoke and dust invade, the return air is mainly used to ensure that the spinning workshop is in a positive pressure state. , to prevent unfiltered and washed outdoor smoke and dust air from pouring into the workshop from the door and window intervals. To maintain the efficiency of the air-conditioning clean room, pay attention to the increase in resistance of the filter equipment, and clean and update the filter layer in a timely manner. Third, in combination with actual production conditions, the washing room should use multiple nozzles, multi-suction pumps, and add soap or synthetic detergent spray to improve washing efficiency. Fourth, when smoke and dust penetrate into the workshop, the bobbin should be raised or doffed in advance, and the car stopper and doffer should wash their hands frequently; when soot yarn is produced, use a sizing brush to follow the spindle rotation direction, Brush the lower part of the bobbin yarn 1 to 2 times quickly; the post-processing process should be to separate the coal ash yarn into tubes according to the weight and classify it for packaging.
Conclusion
Quality is the life of an enterprise. The quality management of the spinning process plays an important role in the quality management of cotton spinning enterprises. The environmental suitability of the spinning process, the condition of the equipment, the quality of the spinning equipment, the correctness of the process and process loading, as well as the operating level and sense of responsibility of the operators, all have an impact on the production of the spinning process. Quality has a direct impact. Strengthening the management of various related factors that have a greater impact on product quality in the spinning process can effectively improve the spinning quality of this process, and even achieve twice the result with half the effort.
, can effectively improve the spinning quality of this process, and even achieve twice the result with half the effort. </p
