The quality difference between spinning spindles, commonly known as spindle difference, mainly refers to the quality difference between each spindle position on the spinning machine. Such as differences in evenness, weight, twist, strength, etc. The differences between ingots exist objectively. Although they cannot be eliminated, measures can be actively taken to minimize them.
Factors that affect the quality difference between spinning spindles: mainly the quality and operation quality of spinning personnel; the advancement of equipment and equipment and the quality of their maintenance; the adaptability and optimization of the process; the quality of temperature and humidity control and uniformity of distribution; The quality of cotton distribution and semi-finished products; the level of quality testing and monitoring, the level of comprehensive enterprise management, etc.
Refined measures to reduce quality differences between spinning spindles
(1) Technical measures
To reduce the difference in evenness and weight between spindles, the focus should be on unwinding, drafting mechanisms and related components:
1. Roving spindle. It is required to be flexible, align the spinning spindle position, and pay attention to the positioning of the hanging spindle next to the roving frame column. Do not cause the roving bar to be scratched by the friction of the yarn guide rod arm. The position of the yarn guide rod must be adapted to the unwinding of the roving hanging spindle. (The operation operation must ensure that two adjacent roving strips do not cross-feed).
2. Trumpet. It is required to be firmly fixed on the flat iron. According to different spinning methods, determine the corresponding range of movement and adjust it appropriately so that it is basically located in the middle of the top roller when traversing (if there is no yarn guide movement, it should also be basically located in the top roller) The middle part); the interior should be smooth and free of burrs, damage, dirt, grease, and accumulation of flowers, etc.
3. Cradle. The cradle base should be fixed on the cradle support and cannot be loose. It is required to work normally. Use a digital pressure gauge to calibrate the front, middle and rear pressures one by one, and control them according to the standard pressure ±5 Newtons; the “three open gears” must be consistent. The top roller, iron shell, and upper pin must be parallel to the roller (unqualified cradle claws and circlips must be replaced in time), and the pressurization position must be correct. For spring cradle, attention should be paid to ensuring the elasticity of the spring to prevent failure. If it is unqualified, it should be replaced in time and cannot be used beyond the service period; for pneumatic cradle, attention should be paid to ensuring the stability and balance of air pressure.
4. Rollers and roller bearings. The roller is required to be firmly supported, work normally, have a radial jump of <0.03mm, and rotate briskly and flexibly; the surface of the roller must be intact, undamaged and clean. When wiping the car, use a copper brush to clean the grooves, and then wipe it with a soft cloth dipped in anhydrous alcohol or gasoline to completely remove cotton wax and small impurities adhered to the surface. The roller bearings must be intact and run flexibly, and oil must be refueled on time. The uniformity of the roller bearings and roller neck rotation must be checked every day, and any unqualified items must be removed promptly.
5. Roller distance. It must be calibrated with a roller gauge to ensure accuracy and basically no difference. After the front roller is leveled, the distance between the front, middle and front and rear rollers must be carefully adjusted. The looseness and tightness should be within 0~0.03mm. The adjustable roller spacing gauge must be calibrated with a vernier caliper before each use. If conditions permit, the front and middle roller spacing gauges can be customized to a fixed value such as 18 or 17.5mm.
6. Positioning of the top roller, upper iron shell and upper pin. The forward impulse of the front top roller relative to the center of the front roller, the centering of the upper iron shell and the rear top roller respectively, the center of the rear roller must be accurate and consistent, and the leading edge of the upper pin and the lower pin must be flush. In the pressurized state, visually check the distance between the apron jaws and the surface of the front roller (commonly known as the one-line-to-day gap), so as not to see the difference (when changing varieties and adjusting the distance block, the one-to-one gap should also be checked need to do so).
7. Upper pin middle leaf spring (if it is a carbon fiber upper pin, this is not required). If it is found that the pressure difference is large or the installation is not in place, it should be replaced or adjusted in time. Generally, all of them should be replaced every 2 to 3 years.
8. Upper and lower pins (if it is a carbon fiber upper pin, there is no need to do upper pin shaping). The upper and lower pins need to be fully calibrated and repaired every 4 to 6 months, using special tools and in accordance with quality standards. Do not use the lower pin as a crowbar while working (common bad behavior).
9. Spacer block and rubber ring jaws. It is advisable to use arc-shaped single-sided spacer blocks and divide them into 0.25mm steps. The spacer blocks on the same type of machine should not only have the same specifications and colors, but also the left and right feet of each spacer block should be pressed down firmly at the same time. On the surface of the front plane of the lower pin, it is advisable that the 0.05mm feeler gauge cannot be inserted. The jaws of the rubber ring should be flush, that is, the upper pin should be flush with the front edge of the lower pin.
10. Lower apron tension hook. Every time you wipe the car, check the tension hook of the apron to ensure that it swings flexibly and can be tensioned well to eliminate unqualified phenomena such as too tight or too loose tension.
11. Leather ring. The model, manufacturer, new and old, and combination of old and new aprons, etc., must be consistent for each vehicle of each type. A reasonable replacement and scrap cycle should be developed. The apron cleaning cycle should be determined according to the type of spinning. After picking up the apron for cleaning, it should be washed and dried with a special detergent. When replacing the apron in cold weather, the apron must be preheated before getting on the car and make it reach the same or similar temperature as the workshop before getting on the car.
12. Top roller. It must be carefully made and ground back regularly to minimize the differences in the top roller itself. It must be cleaned and used correctly. It is required that the diameter, service life, manufacturer, model, surface treatment, etc. of the front and rear top rollers of the same type must be consistent; in order to ensure the perfect operation of the front top roller on the machine, a dedicated or part-time person must be responsible for touching the machine every day. roller, timely detection and removal of defective front rollers. coldto detection.
5. Reasonably select raw materials, strengthen pre-spinning quality management, improve roving quality (including packaging, forming and unwinding quality), reduce the quality difference between roving spindles, and do a good job in protecting the transfer between processes.
6. Strengthen operation management and clean the machine, especially the drafting area, to prevent poor cleaning of some machines and certain areas.
7. Strengthen operation and technical management to prevent human defects, such as touching wool slivers and wearing out rovings.
8. Improve the consistency of employees’ operating skills and prevent operators whose operating skills are not up to standard from operating on the vehicle.
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