Development Trend of Domestic High-production Carding Machines for Domestic Card Clothing

In the history of carding technology development, the development of carding equipment and carding machines has always been mutual cause and effect and complement each other. Only with excellent combing elements can the performance of the new carding machine be supported. Modern high-output carding machines have put forward higher requirements for clothing.

Geometry to precision development

After the high-speed and high-output of the carding machine, it is necessary to increase the fiber stripping and stripping ability, and in particular, to solve the problem of fiber transfer and high-speed airflow caused by short, shallow, dense and small working angles of cylinder clothing. The Doffer clothing adopts a small working angle, a circular arc-shaped tip, and a combined tooth profile, which can increase the transfer stripping ability and gripping ability and also take into account the flexural strength, while increasing the tooth height to increase the interdental volume and guidance. High-speed airflow.

In the case of a corresponding increase in the speed of the licker-in, the cylinder speed is gradually increased from 360 rpm to 450 to 600 rpm. The increase in speed of cylinders results in an increase in centrifugal force and an increase in the tendency of the fibers to slip on the comb needles; in order to improve the ability to hold the carding, the working angle of the needle teeth must be reduced accordingly. As the output of the carding machine is increased from 25 to 35 kilograms per unit to 45 to 140 kilograms per unit, the clothing load increases and the carding degree decreases. In order to reduce the clothing load and increase the carding degree, the total height of the cylinder clothing must be reduced accordingly, and the tooth density is then encrypted.

The licker-in section is to hold the fibers and cotton bundles and remove the impurities. In order to ensure the carding effect with sufficient number of teeth, in addition to keeping the speed ratio of the cylinder and the licker-in at a high speed and without increasing the fiber damage, the needle teeth must be encrypted in the horizontal and vertical directions. Increase the number of teeth acting on the same tuft. Secondly, in order to transfer the carded fibers to cylinders and to improve the efficiency of misalignment, the working angle of serrations must be appropriately increased.

In order to adapt to the requirements of short, small, low, shallow, sharp, and dense fitting of high-speed, high-output carding machines, the flat clothing must improve the arrangement of the needles and reduce the lateral needle point distance. The use of transverse, dense and transverse dense, longitudinally increasing curved line arrangements can be adapted to the cylinder clothing with a base thickness reduced to 0.5 to 0.4.

Installing a fixed cover on a carding machine is a powerful measure to achieve high output, and it is also a development trend of the industry. The fixed cover plate at the rear of the cylinder is fully utilizing the cylinder needle surface to pre-strip the fed fibers and cotton skein, so that the cotton bouquet entering the carding area of ​​the cover plate is reduced and reduced; the uniform cylinder needle surface load is increased. The combing and mixing effects of the carding machine are beneficial to the cover plate to reduce the gauge, increase the needle density, and prolong the service life. The fixed cover plate at the front of the cylinder improves the carding ability of the carding machine, reduces the amount of fiber assembly collected in a single time, increases the number of single fibers, appropriately reduces the fiber transfer rate, and improves the clarity of the web and the fiber of the sliver. Straightness.

Material Technology Professional Intelligence

In order to produce highly wear-resistant metal clothing and additional splitting pieces, China's clothing manufacturers began to directly use imported high-quality finished steel wire, including the German high-resistant alloy steel materials. In addition, the clothing manufacturer also adopts the atmosphere controllable hood furnace for metal wire cloth strips and billets without decarburization and oxidation heat treatment. The atmosphere controllable hood furnace adopts the advanced technology of the world today and realizes the full control and management of the computer. Through hydrogen and nitrogen protection in the furnace, no decarburization, no oxidation, and even hardness of the heat treated steel wire or billet are less than 10Hv. This effectively solves the wire rods caused by the vacuum nitrogen-filled well-type annealing furnace commonly used in China. Decarburization affects the life of the clothing.

In the high-speed carding machine, the centrifugal force of the fiber is large, and it easily flies away from the needle teeth and becomes a floating fiber between adjacent components. Due to the large speed difference between adjacent parts, the floating fibers were severely rubbed, resulting in a large number of neps. In order to make the fiber single, separate impurities and fibers, increase fiber carding length, increase fiber separation and equal extension, reduce nep formation, must be between the licker and the cotton plate, cylinder and cover plate, Xilin and the fixed cover plate, the ligature and the carding board take a tight distance, the implementation of strong carding. The tighter the gauge, the higher the accuracy of the needle teeth. Therefore, high-precision clothing can meet the requirements of high-speed, high-output carding and carding machines.