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Development trend of domestic card clothing high production carding machine
In the history of carding technology, the development of carding equipment and carding machine has been mutually causal and complementary. Only with excellent carding elements can the performance of new carding machine be supported. Modern high production carding machine has higher requirements for clothing.
Geometric specification to precision development
After high speed and high yield of carding machine, it is necessary to increase the ability of fiber transfer and stripping, especially to solve the problem of fiber transfer and guiding high speed air flow caused by the short, shallow, dense and small working angle of Cylinder cloth. Doffer card clothing uses small working angle, circular arc tooth tip, combined tooth profile, which can increase the transfer stripping ability and grip ability and take into account the bending strength, while increasing the tooth height to increase the capacity between teeth and guide high-speed air flow.
With the increase of taker speed, the cylinder speed gradually increased from 360 rpm to 450-600 rpm. The increase of cylinder speed leads to the increase of centrifugal force and the tendency of fiber slippage on the carding needle. With the increase of carding machine output from 25-35 kg/desk hour to 45-140 kg/desk hour, the carding load increases and carding degree decreases. In order to reduce the load of the card clothing and increase the carding degree, the total height of the cylinder card clothing must be reduced and the tooth density must be densified accordingly.
The part of the needle roller should be gripping and cleaning the fibers and cotton bundles. In order to have enough acting teeth to ensure the carding effect, besides keeping the high speed ratio between cylinder and taker and not increasing fiber damage, the taker should also densify the needle teeth and increase the number of teeth acting on the same bundle both transversely and longitudinally. Secondly, in order to transfer the combed fibers to cylinder perfectly and improve the impurity rejection efficiency, it is necessary to increase the working angle of sawtooth properly.
In order to meet the requirements of low, small, low, shallow, sharp and dense Cylinder card clothing of high-speed and high-yield carding machine, the arrangement of planting needles must be improved and the transverse needle-point distance must be reduced. The arrangement of curves with transverse density, sparse density and transverse density and longitudinal increment can be adapted to the Cylinder card clothing whose base thickness is reduced to 0.5-0.4.
Fixed flat on carding machine is a powerful measure to achieve high yield, and it is also the development trend of the industry. The fixed cover plate at the back of Cylinder makes full use of the Cylinder needle surface to pre-comb the fiber and bundle fed into the flat carding area so as to reduce and reduce the cotton bundle entering the flat carding area; to uniformly load the Cylinder needle surface and improve the carding and blending effect of the carding machine; to reduce the gauge, increase the density of the needle and prolong the service life of the flat. The fixed cover plate at the front of the cylinder improves the carding ability of the carding machine at one time, reduces the aggregates of the fibers carding at one time in the cotton net, increases the single fibers, reduces the transfer rate of the fibers appropriately, and improves the clearness of the cotton net and the fiber straightness of the sliver.
Intellectualization of material technology specialty
In order to produce high wear-resistant metal card clothing and additional carding pieces, domestic card clothing manufacturers began to directly select imported high-quality finished steel wire, including German high-friction alloy steel materials. In addition, the manufacturers of card clothing also use controlled atmosphere bell furnace for non-decarbonization and oxidation heat treatment of metal card clothing steel wire and billet. The atmosphere controllable bell furnace adopts the advanced technology in the world and realizes the whole process control and management of the computer. Through the protection of hydrogen and nitrogen in the furnace, the hardness uniformity of steel wire or billet without decarbonization and oxidation is less than 10Hv. It effectively solves the problem of decarbonization of wire rod caused by well-type annealing furnace with vacuum and nitrogen filling protection, which affects the service life of card clothing.
In high-speed carding machine, fiber centrifugal force is big, easy to throw away the needle teeth, become floating fiber between adjacent parts. Because of the great speed difference between adjacent parts, the planktonic fiber is rubbed violently, resulting in a large number of neps. In order to separate impurities from fibers, increase fiber carding length, increase fiber separation and equal straightness, and reduce neps formation, a tight separation distance must be adopted between taker and feeder, between cylinder and cover, between cylinder and fixed cover, between taker and carding board, and between 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 yield carding and carding machine.。