What are the types and functions of carding roller racks in air spinning?

The state of carding roller directly affects the quality of rotor yarn. Therefore, strengthening the correct maintenance of carding roller is very important to stabilize product quality.

First, the role and characteristics of carding roller clothing

The function of the carding roller rack is to comb the sliver into a single fiber and remove impurities, and transport the fiber flow to the fiber conveying channel. There are several kinds of carding roller racks, such as rack type, needle type, tooth type and integral type, among which rack type is the most. According to different working angles and geometric dimensions, rack models can be divided into many types. In order to adapt to spinning fiber raw materials with different properties, the selection and maintenance of rack is very important, which requires not only high hardness, strength and surface roughness, but also good carding performance. The geometric dimensions that affect the carding efficiency of carding roller rack mainly include: the longitudinal pitch of clothing, the sharpness of tooth tip, the geometric shape of working face, the surface smoothness of tooth body, the density of needle teeth and so on.

Second, rotor spinning carding roller clothing

Maintenance requirements and typical problems

2. 1 Usage and maintenance requirements of carding roller clothing

The teeth of carding roller clothing should have good puncture ability, without hanging flowers and winding flowers; Reasonable tooth arrangement structure, combing and impurity removal; The card clothing roller runs smoothly, and the bearing has no abnormal sound and poor shaking. In use, it is necessary to ensure the reasonable cooperation between needle tooth type and fiber characteristics, so as to ensure carding effect and reduce fiber damage. It is necessary to reasonably select the tooth profile of card clothing, ensure the maintenance cycle, and reduce the bad phenomena such as broken teeth and broken tips; Ensure the good basic state of carding roller body and the requirements of dynamic balance review.

2.2 Typical problems of carding roller clothing

In the application of carding roller clothing, typical problems mainly include: bearing damage of carding roller, poor maintenance of roller body function, broken teeth, broken tip, poor maintenance of coating, inconsistent start and end of coating, improper tooth profile selection and poor carding effect, which affect the stability and quality of operation.

Third, rotor spinning carding roller clothing

Analysis and control of typical application problems

3. 1 Comb roller bearing wear

3. 1. 1 Reasons for wear of carding roller bearing

3. 1.2 Control measures for carding roller bearing wear

(1) Reasonable selection of carding roller speed. For the new automatic or semi-automatic rotor spinning machine, the reasonable range of carding roller speed is between 5000 and 9000 r/min. When the speed is high, it is beneficial to improve the degree of fiber decomposition and impurity removal, but it is easy to damage the fiber, and the needle teeth may break the long fiber and affect the yarn strength. Therefore, on the premise of meeting or reaching the requirements of yarn quality, the rotating speed of carding roller should be controlled as low as possible to prolong the service life of carding roller bearing and rack.

(2) Correct the dynamic balance in time. The carding roller coated with card clothing must correct the dynamic balance. Dynamic balance is the basis to ensure stability, and the carding roller must also correct the dynamic balance to ensure the stability of operation, otherwise it will vibrate greatly during operation, which will easily lead to the rapid wear and fall off of the tooth tip.

(3) Properly refuel and maintain. Timely oiling and replenishing oil is the basis to ensure the good running state of carding roller. Dust and impurities accumulated in the spiral grooves and measuring holes at the upper and lower end faces of the aluminum wheel of the carding roller, and oil stains at both ends of the bearing and winding yarn should be cleaned in time; The melted ribbon scraps stuck on the ribbon disc of the carding roller should be polished regularly with fine sand cloth to keep the carding roller in a flexible running state, so as to avoid the bearing heating due to the increase of resistance and shorten the service life.

3.2 Causes and control of broken needles and tips of carding roller clothing

3.2. 1 Causes and effects of needle breakage of carding roller

When the needle teeth of carding roller are broken, the inverted teeth will make the fibers transferred to the spinning cup gather together, thus forming thick knots. There are two main reasons for the broken needles of the carding roller: First, there are many impurities in the raw materials, and the needles of the carding roller encounter hard impurities, heavy impurities or long-term wear, and the sharpness decreases, and sometimes the needles are broken, bent and dropped. Secondly, the geometric size of carding roller clothing is not wear-resistant, which leads to the damage and fracture of clothing.