Key points that should be paid attention to when using the collective doffing spinning car
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In recent years, cotton textile and weaving enterprises have accelerated industrial upgrading, intensified technological transformation, and equipment transformation has continued to progress in the direction of continuity, automation, high speed, and informationization. In particular, the use of overall doffing with spun yarn belts has increased significantly. .
According to statistics, at the end of 2015, there were approximately 20 million spindles in the national cotton textile and weaving industry. As a highly automated spinning equipment, the overall level of the domestic overall doffing spinning car has been greatly improved. The China Cotton Industry Association advocates accelerating technological progress and transformation. In order to make good use of the equipment and exert its due efficiency, according to experts suggestions, summarizing the following key points that should be noted:
1. The body of the spinning frame is long. During the drafting process, the roller is prone to torsional vibration, which will affect the quality of the yarn. Therefore, the drafting multiple in the rear area should be controlled on the small side.
2. Some parts have a high failure rate, such as the pipe grabber is easily damaged, the spindle is prone to crooked spindles, the roller sensor is damaged or malfunctions, the ring plate is misaligned, etc. For this reason, equipment maintenance and management should be strengthened. Each pipe grabber must be inspected every day and every shift, and damaged pipe grabbers must be replaced in time. Since the load of the running parts of the long car is heavier than that of the short car, the grease should be changed to effectively reduce the wear of the components. ; The mechanical oil on the spindle should also be replaced to reduce energy consumption and wear.
3. Because the distance between the dragon rib and the car surface is short and the spinning machine is large, the yarn guide angle increases, the distance from the twisting area to the yarn guide hook increases, and the change in the spinning yarn tension increases, so the end-breakage is high. Matching special parts should be selected, such as steel rings, travelers and other special equipment, all of which should be made in China. The high speed of the spindle should generally not exceed 16000r/min; in order to reduce end-breaks during driving, the winding of the short spindle at the starting position of spinning needs to be changed. Winding method: first let the steel ring rise to the middle position and wind it for a few times, then lower it to the starting position at the bottom of the tube for normal spinning.
4. It is normal for long spinning machines to consume more energy per ton of yarn. Generally speaking, the longer the spinning machine, the greater the energy consumption. Compared with short spinning machines under the same conditions, the energy consumption is more than 15% higher. Appropriate energy saving and reduction measures should be taken. Consumption measures should be taken to appropriately reduce the weighting arm pressure while ensuring the quality of the yarn. Each spinning machine can save at least 1 to 2kW·h per hour; a normally closed flute can be designed, similar to the rotor spinning machine. The probe rod that detects the tension of the spinning yarn is connected to a sealing cover at one end of the probe rod. The sealing cover is tilted and opened when the spinning yarn is broken. This method can save the energy consumption of the spinning yarn suction fan.
5. Long doffing time has a great impact on production efficiency. Production efficiency is closely related to the effective time coefficient, empty spindle rate, rubber roller fraying rate, and yarn recovery rate. The time for shutdown, doffing, and machine blocking workers to deal with empty spindles should be reasonably arranged, and daily repair and maintenance of the equipment should be done well to improve the overall improvement. Productivity.
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