Using this circling machine advantageously supplies the feeding point cotton layer with a substantially constant thickness and a uniform strip; the calling card table is more flexible, adapting to changing yarn varieties, and small batch production turns. Carding machines are used to process cotton fibers and chemical fibers and belong to textile machinery. According to the spinning process, carding is an important process.
The front process of the carding machine is the opening and cleaning machine, and the latter process is the drawing frame (carding process) or the sliver coiler (combing process). During the spinning process of the spinning frame, the semi-finished roving or sliver is drafted, twisted, and wound into a spinning machine. The combed sliver and the needle-carding machine combine the sliver, the needle row is drafted to improve the sliver structure, and the roving is further spun into spun yarn on the ring spinning frame, which is the main spinning machine. The structure of the double twisting unit of the double twisting machine mainly includes the spindle braking device, the spindle part of the double twisting machine, the yarn winding device, and the special device of the double twisting unit.
The disadvantage is the heavy labor of unwinding, transportation and coiling; when the unwinding layers adhere to each other, the volume of the fibers present in a uniform strip is seriously affected. Since the 1970s, in order to meet the requirements of high-production machine carding (30 kg/h yield), most domestic and foreign textile mills have introduced carding machines, that is, netting machines that remove the slip gold process. From a beater through the final fine opening of the fan into the pneumatic conveying tube clumps of cotton pickers are blown into each tank feeding table.
The output of the pneumatic conveyor with definite carding capacity, roughly circular arc per cotton carding unit and 6-8 units open to the pneumatic feed associated in two ways: (1) No return line, i.e., the pneumatic conveying closes one After the last pipe on the card, and in the inner duct, the cotton clumps are all assigned to each feed hopper table in Figure 2-44, when all the feed hoppers enter the air without cotton filling, the duct acts as an electric switch, Stop cleaning the cotton beater to remove the tube. (2) There are backflow and pipelines, that is, the pipelines of the pneumatic conveying equipment are in a loop. As shown in Figure 2-45, the excess cotton clumps in the pipeline that are not selected by each cotton feeding box are returned from the mass cotton pipe to the cotton storage box. Inside, it can be sent to each feeding box by the fan again, but such a processing problem is easy to cause neps, and the enlargement needs to be based on the former. There are also two types of research on the development of the feeding box: one is a single section, which is used for cotton storage and cotton feeding.
The other is double-section, the upper box is used for cotton storage, and the lower box (for feeding cotton together, there is only a beater in the middle part of the upper and lower boxes to make the cotton clump advance) to further open and uniform. Now most of the enterprises in our country use the latter. The blowing and carding machine abandons the lap feeding method, and is suitable for high-speed and continuous use in large-scale social production in China.
Because at present, the machine uses a lot of power to convey and distribute cotton. The density of the fed cotton layer on the carding machine cannot be kept stable and relatively uniform, so it also causes the deviation and unevenness of the weight of the long sliver (or ultra-long time segment). In order to ensure the cultivation in the feeding box In the process of uniform density distribution of the output cotton layer, attention should be paid to the following points: (1) The starting degree of the cotton clump should be higher than the opening degree of the conventional rolling machine (2) The lowering and lowering of the cotton feeding box The pressure on the output cotton layer of the box should be uniform, harmonious and stable.
Therefore, in addition to requiring students to be relatively uniform in the horizontal direction of the cotton storage in each box, it is also required to increase the minimum cotton storage height and the constant changing range of the height to reduce the influence of the large change in the self-weight of the stored cotton. The static pressure of the airflow has the effect of compacting the cotton clumps, so it must also be stable. Another important aspect is to pay more attention to reducing and stabilizing the output of the cotton layer in the control box as the resistance to movement, that is, there must be a smooth surface and no air leakage between the inner walls of the lower box. (3) The design of the cotton conveying pipeline and the selection of wind speed and wind pressure should conform to all the basic principles of pneumatic conveying. The inner wall of the pipeline material should be smooth without air leakage. The form and structure of the brocade conveying fan should facilitate the smooth passage of the cotton clumps. Not because of osmanthus.
According to the relevant theory and practical experience, it is proved that there are no backflow pneumatic cotton supply systems for 7 carding systems. Using 10m/s wind speed data in the 300mm diameter cotton conveying pipe can complete the cotton conveying requirements to the second floor carding machine. , There should be fewer right-angle elbows in the pipeline, preferably no more than 3 per system.