Why Is The Difference In Elongation Between Roving Front And Back? Why Does Ring Spinning Machine Clamp Aprons? Sword And Sword Belt Wear Replacement Principle?

Question 1: why is the difference between the elongation and the percentage of roving before and after roving?

　　 Answer: The elongation difference between the front and rear rows of roving is due to the fact that the distance between the front flyer and the front roller is larger than that of the rear row, and the front row is more severe than the rear row, which causes the jitter and twisting phenomenon to be more serious. The following measures can be taken:

1) make the front row of yarn slid around the 3/4 circle on the top of the flyer, or turn around the 3 circles on the palm of the hand, the back yarn will circle the 1/4 circle at the top of the flyer or turn around the 2 circles on the pallet, thus increasing the winding tension of the front row and reducing the spinning tension, reducing the elongation of the yarn above the top of the flyer, and making the increment of the winding diameter of each layer less, so as to reduce the winding speed and reduce the elongation of the front roving.

2) when feeding with large cotton sliver canister, the rear cotton sliver will be drafted with large draft, and the rear spindle will be supplied. The front row of cotton sliver has small draft, and the front row spindle will be supplied to reduce the elongation difference between the front and rear rows of roving.

3) adjust the specifications of the front and rear rows of false twisters.

Question two: why do ring spinning machines clip aprons?

　　 Answer: The reasons for ring aprons are as follows.

A) the torsion of the rubber ring of the spinning apron is too small, and the lower apron presents tension relaxation.

B) the distance between the front and middle rollers of the spinning machine is too small, causing the apron to run in front of the apron, and the apron is blocked and the turning is not good.

C) the front roller's winding is serious, resulting in the obstruction of the lower apron running channel.

D) after adopting the new pin, the friction resistance between the inner and lower pins of the lower apron increases with the increase of the surface of the lower pin.

E) the relative humidity of the workshop is too large, the apron is humid, or the inner layer of the rubber ring is attached with flying flowers, and the friction resistance increases.

F) the internal friction problem of the rubber ring increases the frictional resistance between the inner layer and the lower pin rod.

G) the pressure of the spun spacer block is too small and the pressure of the upper and the lower pins is too large, which leads to the increase of the operation resistance of the lower apron.

Question three: the principle of wearing and replacing the sword head sword?

　　 Answer: The swords and rapier bands will wear out in different degrees during wear and tear. They must be replaced and repaired. The following conditions must be replaced and replaced: (1) the wear of the sword head bearing; second, the thickness of the belt body is more than 1.5 mm, the thickness of the sword head is more than 1 mm, the wear of the belt hole is more than 1 mm; 3. The weft hooks are bent, broken and seriously worn.