Drawing part of the organization and function

Drawing part of the organization and function - 2019 07 - 09 draft part institutions mainly including drawing roller, roller bearings, roller, roller bearing, aprons, apron pin, collector, pressurized structure and cotton absorption device, etc. Section on the spinning frame fa506 device is shown in figure 1. 1. Drawing roller drawing roller and roller on the roller nip, hold the yarn for drafting. The main requirements of drawing roller is: ( 1) Roller diameter and the length of fibers of the roller, roller weighting amount, bearing type, there is plenty of bending and torsional stiffness; （ 2) Has the right groove profile and conform to the requirements of surface finish, can be fully grip and not damage fiber; （ 3) Laura usually use 20 steel processing, impregnation carbon on the surface hardening; Or it is 45 # steel after high frequency quenching; There are roller surface chrome plating or other surface treatment. Laura should has high manufacturing precision, interchangeability, minimize caused by roller eccentricity, bending mechanical factors such as yarn unevenness; （ 4) The surface should have a certain hardness ( Hardness greater than hrc78) , the center layer is tenacious, abrasion resistance, as well as calibration curve. Before and after the two columns of Laura is commonly grooved roller, transmission of aprons for knurling roller in the roller. Laura section before and after the tooth shape as shown in figure 2, figure ( 1) For the groove toothed Laura, figure ( 2) For the knurling tooth form roller. The addendum is the part in contact with the top roller, the top roller is too narrow to damage and fiber, too wide, decreased grip force. Knurling roller profile is equal Angle of tooth shape, cylindrical surface with uniform distribution of the diamond convex block, avoid skidding apron. Diamond lug too sharp, easy to damage the apron. Grooved roller axial tooth have straight teeth and helical teeth and herringbone gear of three. Type fa506 spinning frame made isometric helical, herringbone symmetric distribution. 2. Roller bearing roller bearing and transmission bearings, can be divided into two major categories of sliding bearing and rolling bearing. Sliding bearing materials have cast bronze, iron or copper base powder metallurgy oil-bearing brass, nylon and phenolic laminated material, etc. Rolling bearing can be divided into two kinds of ball bearing and needle bearing. Frame fa506 type roller adopt needle roller bearing. 3. Every two ones of a roller roller, the iron shell, nitrile rubber hose, roller core shaft and roller bearing. Hose set with mechanical method on the iron shell, and on the inner wall of the hose or iron shell surface coated with adhesive, rubber hose and iron shell with tape. Grooves are common iron shell surface, to increase the iron shell and bonding force between the rubber hose, prevent the hose under the heavy pressure rotary slip from the iron shell. At present there are two kinds of new type structure of the roller, one kind is double roller, the inner layer hardness is higher, the outer layer of the soft elastic rubber roller; The other is a lining for aluminum casing, rubber vulcanization directly again on aluminum bushing on the pressure distribution in the steel casing pressure roller type without a set of differential structure. New type roller has the advantage of convenient assembly, able to bear the heavy pressure, long service life, and can be eliminated due to the disadvantages of poor. Roller quality had a great influence on yarn evenness, as a result, the production of choose roller has the strict request, mainly has the following several aspects: ( 1) Roller surface should be clean, smooth, with enough friction coefficient and absorption and release some wet and antistatic properties, in order to reduce around flowers; （ 2) Butyl cyanide rubber coated to have moderate strength, elastic, wear resistant, oil resistant, resistant to aging; （ 3) Roller roundness is better. Molecular structure of NBR wants even, smaller set of difference, prevent deformation eccentric. Around the same pair of roller on the diameter of the two roller should agree, control the difference in 0. Within 5 mm, eccentric wear, deformation, etc are not allowed to exceed the tolerance range, in order to reduce the mechanical drafting of factors on the impact of uneven; （ 4) Regular maintenance of hone. Yarn with nitrile rubber hose, cut into the required length after pressing sleeve on the roller shell. After coarse grinding, use after 3 ~ 5 months, because of the roundness, rough surface, the need to hone, can generally be 5 ~ 7 times, each time the grinding quantity about 0. It is advisable to 2 mm, smooth, polished. Grinding after 6 ~ 7 times, cladding layer becomes too thin, lack of elasticity, the article must be holding ability is very bad, must be replaced. The new roller diameter, good elasticity, appropriate is used for fine Tex yarn. Roller after successive hone, diameter decreases, and reduced elastic, adjustable to coarse yarn to use. Roller to use after a period of time, because the surface stains, hair, easy adhesion fiber, need to wipe the car cleaning and refueling. 4. Roller bearing frame with sl series roller bearings, sl for roller bearing. Type fa506 spinning frame with sl series top roller bearings, bearing capacity is big, so it is suitable for high speed and heavy load. Before and after for rubber roller, roller on using sl6819a rolling bearing, outer diameter of 19 mm, package after nitrile rubber for 28 mm; Upper roller as small iron roller, using sl6825ea ball bearing, outside diameter is 25 mm. The structure of double row ball bearing with retainer is shell and adopts fold type double seal, relatively less friction, refueling cycle is long, the yarn less pollution, flexible smooth rotation. （ Source: jin kun textile)