Special parts for twisting equipment a. Spindle Spindle […]
Special parts for twisting equipment
Spindle is the core component of winding and the key equipment to realize high-speed spinning. The basic requirements of high-speed spinning for the spindle are: ① stable and reliable operation, low noise, generally in 25kr/min space-time spindle vibration range is not more than 0.03 mm, noise is not more than 70db; ② low fuel consumption and easy maintenance, with NOVlBRA, TEXPARTS as For example, one time of oil change in 1a operation is equivalent to 23 times of oil replenishment for ordinary spindles; ③ Energy-saving and low-consumption, the diameter of the spindle is reduced from 20.5 mm to 19 mm (18.5 mm), or even 17 mm, which is improved. The purpose of spindle speed without increasing the energy consumption of the host. The main structural features of high-speed spindles: ① Using small-diameter upper bearings and small-diameter spindles, the diameter of the upper bearing is reduced from 7.8 mm to 6.8 mm, or even lower (5.8 mm); ② The lower bearing adopts a composite bearing , The radial dynamic pressure bearing and the axial plane thrust bearing respectively bear the radial force and the axial force, and the spindle tip is changed from a small spherical surface to a large spherical surface; ③ It adopts a labyrinth-type dust-proof and anti-flying oil device; ④ Double elastic spindle structure. At present, domestic high-speed spindles are not much different in structural design compared with imported spindles, but there are still gaps in the processing technology, the quality level of raw materials, and the detection and control of product parts, resulting in product reliability, stability and The maintenance and use are not as good as imported products.
Compared with other special equipment, most spinning companies often ignore the role of the bobbin, starting from the customization of the bobbin, they do not pay enough attention to it. Since the bobbin and the spindle rotate at the same speed, they need to have good dynamic balance and avoid Head shaking and tube skipping problems occur at high speeds. The quality of the bobbin is generally required: ① The bobbin is sleeved on a standard spindle, the gap between the bottom hole and the spindle is not more than 0.10 mm, and the contact area between the spindle core hole and the spindle is not less than 85%; ② The bobbin is at a spindle speed of 18kr/min. When running on the spindle, the average vibration range of the empty tube at the top is not more than 0.15 mm, the average vibration range of the full tube is not more than 0.25 mm, and the middle and lower vibration range is less than the top vibration range.
c. Ingot ribbon
The requirements of high-speed spinning on the spindle belt: ① Good wear resistance, low elongation, the elongation required by the spindle belt factory is not more than 3‰; ② The contact surface with the spindle disk should be smooth, but can maintain a certain amount of friction Force; ③ Long service life. In daily production, attention should be paid to the maintenance of the ingots, such as avoiding the abrasion of the ingots caused by the incorrect position of the ingots; the joints of the ingots are firm, and the ingots that have been used for a long time must be replaced due to excessive elongation.
d. Ring traveler
Rings and travellers are the key equipment for achieving high-speed spinning. When the ingot speed reaches 20kr/min and the ring diameter is 38 mm, the linear speed of the traveler can reach 40 m/s, and when the ring diameter is 42 mm, the linear speed of the traveler can reach 44 m/s, which is so high. The speed puts forward very high requirements on the wear resistance and heat dissipation of the traveler. From the statistical analysis of spun yarn broken ends, it can be seen that the number of broken ends caused by wear-out of travellers, flying rings, etc., accounts for more than 1/3 of the total number of broken ends. The basic requirements of high-speed spinning for ring and traveler are: ① Long service life; ② Short maturity period and less end breakage; ③ Stable yarn quality and less hairiness. Requirements for the use of steel collars and travellers: ① Choose different specifications and models according to different varieties; ② Matching of steel collars and travellers; ③ Strengthen daily use management. After the steel collar has been used for a period of time, it needs to be inspected. The main contents of the inspection are shown in Table 4.
e. Balloon ring
Most domestic spinning frames are short ones, which use manual yarn drawing and spindles.
The speed is not high, and the balloon ring has been in a state of being abandoned. In fact, the balloon ring effectively reduces the spinning tension (can be reduced by 25%) by turning the large balloon into a small balloon, which is very effective in reducing end breaks and increasing the spinning speed. Therefore, foreign spinning frames have adopted the balloon The ring is a necessary accessory. The requirements for the use of the balloon ring are: ① Select the balloon ring with appropriate specifications, materials and processing requirements; ② The surface is wear-resistant and the surface roughness is good; ③ The height of the balloon ring is reasonably determined; ④ The balloon ring is maintained in time to ensure that the balloon ring is in place. normal status.
f. Yarn guide hook
Yarn guide hooks are often not taken seriously by people. Careful inspection on the car will find that the inner holes of the guide hooks are not smooth or even grooves. This is related to the surface treatment method of the guide hooks. The traditional treatment method is hard chromium plating, with a hardness of 650 HV to 750 HV, which is not wear-resistant; in recent years, the use of nitriding treatment has made the surface hardness layer uniform, and the hardness, surface roughness, and wear resistance have been improved. The guide hooks can be selected according to the following methods: ① For spinning yarns above 14.58 tex, the diameter of the guide hooks is 2.5 mm ~ 3.5 mm; for yarns below 14.58 tex, the diameter of the guide hooks is 2.5 mm; For yarns below 7.289 tex, the hole diameter of the guide hook is 2.0 mm; ② For spinning pure cotton yarn, the hardness of the guide hook is not less than 900 HV, and the thickness of the wear-resistant layer is not less than 0.02 mm; for spinning chemical fiber or blended yarn , Choose the guide hook hardness not less than 1 000 HV, and the thickness of the wear-resistant layer not less than 0.045mm; ③ For spinning medium and thick yarns, use single-loop guide hooks, spinning fine-gauge yarns, and multi-loop guide hooks.