In the old carding machine after transformation, some adopt the belt stripping device composed of belt, guide roller, belt roller and skinning roller, and its structure is shown in Figure 3-34. 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 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 belt is supported by strippers and belt rollers and driven by guide rollers.
The position of the belt roller can be adjusted back and forth, so that the belt is separated from the doffer by about 1 mm under the action of the peeling gravity (about 3.25 kg). Through the friction of the rotating apron, the cotton net on the doffer falls off, and the output is between the yarn guide and the apron. The surface speed of the carding apron is equal to the doffer, that is, the idle large base sheep cotton guide roller and pressure roller of the drafting cotton configuration, which is attracted to the appropriate size between all the weak tension, easy to pull the cotton web to break Between too large and too small, cathode fall cotton, generally doffer 30 rpm, can be equipped with a 1.35 times.
The effect is mainly dependent on the stripper apron, for normal operation, the figure claims the skin is soft (eg, 1mm thick), the brain's ~ operation butyric acid production scale view at temperatures not higher than rubber 20 by non-occurring and unexpected Reduce jump elongation hard, low humidity (50% or less) generates less static electricity; smooth surface to avoid stripping stations larger than or below ills such as adherent fibers. On the low-yield carding machines of some old factories, a chopper stripping device is also used, as shown in Figure 3-35. In each swing of the chopper, the upward movement is empty, and it does not play the role of stripping cotton.
When moving to the next movement, at the distance point H), it is also generally free travel. The starting point c of stripping is near the distance point b, and it can play a stripping role between it and the lowest horizontal position d of the chopper swinging, which is the effective stroke of the chopper for stripping cotton. Due to the tension control of the cotton web and the social impact of the chopper on the cotton web by swinging at a high speed, when the chopper swings actively upwards from point d, a small section continues to peel off from the doffer.
From this we can see that the chopper is intermittently stripping the cotton web from the doffer, and the cotton web that can be peeled off each time is only a short period of time. Since the product of the number of swinging movements of the chopping knife per minute and the length of the net for each peeling off is approximately equal to the speed of surface treatment that Doffer thinks; therefore, when Doffer is turned into a fan and the knife is turned in a small proportion, the natural swing frequency is increased. , then the length of the cotton web peeled off by the chopper should be increased each time, and at this time, the enterprise starts to peel off the point c and move it up to the top of the distance point b. Therefore, it is necessary to use a carding machine with a chopper stripping cotton in production. When increasing the doffer speed, the measures to improve and extract efficiency mainly include: (1) Increase the number of vibrations per minute of the chopper; (2) Increase the Chopping oscillation stroke; (3) The knife cuts the corresponding stroke position to shorten the idling.
Practice has shown that the conventional means of shredder speed generally does not exceed 2000 rpm, and the stroke movement of the swing position is increased, and their respective swing increases are effective strokes. However, the hem chop position is too low so that the chopper is too far from the doffer surface, a uniform stripping action can damage the fleece structure, the stripping start point is too high, and the uniformity of the nonwoven is compromised.