Pick to: through the analysis of the drawing frame mechanical wave, think that the roller oil shortage or shaft center hole wear roller beating or swimming is the main cause of mechanical wave. In FA302 and FA306A drawing frame test and promote new article and the roller core shaft sleeve, avoid design, reduce the pollution of the sliver, oil defects, eliminate the roller beating and moving mechanical wave, reduce the maintenance workload, save machine material consumption, improve the quality of cotton yarn level.
Article and the process is an important process in spinning production, the main purpose of the drawing frame is sliver drafting of merger, to improve the degree of fiber parallel straight, the purpose of reducing weight irregularity. Drafting roller as important components, whether its quality fit and unfit quality and running smoothly, will directly affect the quality of the product. My company since 2005 in FA302 drawing frame and FA306A to use the new drawing frame and a roller core shaft sleeve, popularize the use of nearly 100 units, has achieved good effect.
1. Drawing frame and the cause of mechanical wave analysis
In the sampling test and all dry, often can appear the mechanical wave peaks at about 10 cm. To Laura repeatedly check has not been found that the problem, after replacement of top roller, mechanical wave to eliminate, so bad condition of roller is the main cause of mechanical wave.
Found in the daily inspection on roller skin roller head beat is more, a lot of roller and the phenomenon of axial swimming, swimming the largest amount to about 3 mm. Will beat of the large amount of serious and walk roller replacement to the former experiments respectively, are severe mechanical wave, and laboratory tests and all dry coincided basically with the mechanical wave, and all the CV % value slightly worse, but the CV % value of yarn.
Article through analysis, and 10 cm of mechanical wave after roving frame and spinning frame of draft, on the yarn spectrogram reflecting wavelength in about 20 to 30 m, belong to the long piece not divide evenly. On the evenness tester to test yarn evenness CV % value, the cutting length is 8 mm, adoption is spun yarn is short clips of uneven situation, to produce it for article and the reasons of 20 ~ 30 m wavelength uneven impact, so the CV % value of spinning yarn. Bad but drawing roller mechanical wave, often produces fine weft, weft yarn and the defects of cloth, seriously affect the quality of cloth.
2. The roller to beat and the analysis of the causes of swimming
2.1 roller beating
Inspection on beating serious roller, find bearing bad more, a few core shaft bending. Bad bearings mainly because of lack of oil. Article and roller maintenance cycle is 15 days, because the roller high-speed operation, embellish lub oil issue from the socket easily after heating, the cycle gas found short of oil is relatively common. Article also in the process, and the roller wrapped around flowers, the value of Turner often wind flowers, from under the side wipe under wipe around flowers as well as the embellish skin roller head slide grease erase, cause the roller run short of oil.
2.2 roller winding
Will swim roller sleeve off, some roller winding phenomenon largely disappeared, but also has the very big part of the problem still exists. Open winding roller sleeve, sleeve to check our internal and spindle, found that the skin of the swimming roll shaft Head of center hole all have varying degrees of wear, some internal DingZhu sleeve have wear. Article and the roller in operation, the axial is fixed by DingZhu and center hole, the axial force is small. After the DingZhu or central hole wear, it fit problems, generate vibration in the operation, will give skin roller to generate thrust, swimming around the roller in the operation process.
Article 3. The new type and the use of roller core shaft sleeve
Solve the problem of beating and roller path and swimming, usually to shorten the maintenance period, increase the number of refueling, timely replace worn core shaft and sleeve, but the maintenance workload and machine material consumption will increase significantly.
In October 2005, we test on FA302 type and type FA306A drawing frame and gradually promote the use of the new article and the roller core shaft sleeve (commonly known as the roller), get on the car after thoroughly eliminate the phenomenon of the roller beating and swimming.
3.1 the new article and roller core and the structure characteristics of shaft sleeve
(1) using double row deep groove ball bearing to replace the original needle roller bearing, the total heat dropped to 60% of the conventional structure, the use of new structure bearing temperature rise are much smaller than the conventional structure.
(2) the internal storage space is large, and USES the labyrinth dust, oil spill prevention, lubrication condition is good.
(3) the inner ring of the bearing structure, and the core shaft and the inner ring relative static friction, and so are not wear spindle head.
(4) core shaft and bearing inner ring cooperate with gradient combination, good concentricity, convenient installation.
(5) core without axial channeling between shaft and shaft sleeve (only collar around the axial clearance of 0.08 mm), and conventional core shaft and shaft sleeve axial clearance rash move up to 1-3 mm.
(6) the ideal heat treatment ways, make the spindle there are both enough strength and good toughness.
(7) core shaft and shaft sleeve head part of the chrome plated surface, package of rubber vulcanization and use at ordinary times is not easy to rust.
3.2 use effect
After two years of use, the new article and the roller core shaft sleeve get in the car after the fever is small, smooth operation, found no damage, and article 10 cm mechanical wave basically eliminated, achieved good results.
3.2.1 cotton yarn quality level
After new article and the roller core shaft sleeve on the CV % of the article and the improved obviously, and fine, coarse weft weft and the defects is significantly reduced. But for spinning yarn quality have little impact on test results, this is mainly due to the yarn evenness CV % value reflects the short fragments of yarn unevenness unevenness, and for the article and the long segment uneven defects caused by poor roller is not obvious. New article and the roller core shaft sleeve on a dry level before and after comparison of the results are shown in table 1.
Table 1 new article and the roller core shaft sleeve on a dry level before and after contrast (C14.5 Tex)
3.2.2 solved the original socket leak, pollution sliver problem
The new article and use sealed bearing roller core shaft sleeve, avoid design, so there will be no oil flow in the run. Original roller in use process, often pollution clean Turner's hand tools and values, indirect cause oil pollution sliver, or in the value of lathe processing roller around flowers, the cause to take the oil.
3.2.3 extended maintenance cycle and reduce the maintenance workload
New article and the roller core shaft sleeve don't have to go, only when the maintenance of the roller surface clean. According to usage, the roller maintenance cycle consists of 15 days to 30 days still can meet the quality requirements.
3.2.4 machine material consumption saving
My company is the original article and the roller sleeve to increase around 1200 sets per year, calculated at each only 22 yuan, consumption costs about $26400 a year. But this kind of consumption is still can't satisfy the quality requirements, because after the core shaft wear is unlikely to change entirely, so roller winding will not completely solved, if change the spindle, greater consumption of rubber hose.
New article and the roller core shaft sleeve, each 110 yuan, according to the calculated using 2 years (2 years factory warranty), the average annual cost is 46640 yuan. From now on the use of roller, using 3 years there will be no problem, we first test of roller core and sleeve have been used in 28 months, still running normally. If calculated at three years of a complete set of replacement, the cost is about 31093 yuan a year. The core wastage in use, however, after a one-time investment, later need to replace the axle sleeve, calculated at three years only replace collar, only need 26000 yuan every year, the cost and purchase sleeve is the same as the ordinary, but high quality significantly.
Ordinary roller bearing gas fee per each year only about 0.06 ~ 0.08 kg, 106 drawing frame calculation according to my company, only a year and a roller oil lubrication need about 60 kg, value of 1500 yuan, and after using the new type roller core shaft sleeve, refueling, and also can save the cost.
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