(1) Cohesion effect of doffer Because the fibers of slow doffer on the building area of an enterprise unit are transferred and gathered from the management area of many work units of fast xinjinlong, the effect between xinjinlong and doffer can be called China Cohesive social action (carding action). 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. Special equipment for the textile industry on the winder.
As the last process of spinning and the first process of weaving, winding is the link between the past and the next.“bridge”Therefore, it occupies an important position in the textile field. 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 needle teeth of Xinjinlong and Doffer needle face are arranged in parallel, so the function between the two needle faces is essentially a combing function.
The section of Xinjinlong and Doffer's carding action is about 30mm on a general carding machine. (2) Doffer transfer rate (1) Definition and calculation of transfer rateαf and return workloadαThe amount of fibers in b participates in carding in different degrees, and the transfer rate of the doffer should be =αd/(αfr=αd/αb), during normal operationαd=αd/αbαCalculation method of f transfer rate r1=g/Q0×100%, (usually can be used to study metal clothing) r2=g/Qc×100%; R2 =αDVD/αC×100% G of Vc - Cylinder around fiber with doffer volume. G = P×1000/(NC×60) P - output (kg/unit hour), nc - Xinjinlong speed (r.p.m.) Q0 - free fiber amount QC - hourly the amount of needle cylinder converted into fiber surface in 1 week from the working area of plane load carding cylinder (including replica needle cylinder Load load) (hard test) (2) The relationship between the average carding working time and the transfer rate From the transfer situation, after repeated carding at different times, the fibers fed at one time are transferred to Daofu.
The carding time of fibers varies greatly, and the average carding time is used to represent the carding effect. tn=Q0/g=1/(g/Q0)=1/r1 Reciprocal of conveying rate and average carding time: The conveying rate is large, and the carding time is short. If R1 = 10%, TN = 1/10% = 10 RPM; if 1/6 second per revolution, TN = 1/6×10 = 1.7 seconds big r1, small q0, small tn; small r1, big q0, big.
Considering the carding time and the needle load, r1 and tn are selected according to factors such as feed, product, and process. (3) Transmission rate of influencing factors (a) Xinjinlong speed nc∵r1=g/Q0×100%=P/(ncQ0)×100%, ∴ output (P) remains unchanged, nc↑,Q 0↓(free and fiber amount) when g (transfer at a time) and r1? Experimental Results, Start: NC↑↓R1; later: NC↑↑R1. (b) Yield P: The living sliver quantification can be determined by the speed of the sliver quantification and Doffer thinks the undead :p on→nd, q0 down, r1 up.
Cotton sliver ratio: p→ nd constant, g, r1 (q0 also increases, but slower than g) P is constant, the product of lobe quantification and isokinetic doffer. (c) Gauge C～D Gauge: Gauge↓Doffer Grab Work Capability↑, r1↑. This general pressure gauge is about 0.12mm.
(d) Card clothing company specifications:αd small,αc is big, r1 is big; hd is big, hc is small, r1 is big. Fiber shape: fineness, maturity, moisture content. (C) The experimental study of the fiber mesh and hook structure confirmed that various social forms and the arrangement of fibers can be in the mesh, and most of the fibers are in the hook state.
Back hook fibers account for more than 50% of the total fiber production in the web, and front hook fibers account for about 10%.