The pipe line of the hydraulic pressure pipe is formally installed
Three. Threaded pipe threads (GB 7306 is the same as ISO7/1)1. thread sealed pipe threads, without padding or sealing, can prevent leakage. The pipe thread with screw thread has two connecting forms: cylindrical internal thread and tapered outer thread, tapered inner thread and tapered outer thread. When the pressure is below 5 * 105Pa, the former connection is close enough, and the latter connection is usually used only at high temperature and high pressure.2. thread sealed pipe thread, there are two kinds of thread cone, cylinder. The external thread has only one form of taper. Tooth type is as follows: taper 1:16, tooth shape angle 55 degrees, old thread standard example: ZG3/8;
2.2. common thread is used for the connection and fastening between the mechanical parts, and the general thread connection is mainly made of coarse thread. The thread strength of the fine tooth thread is slightly higher than that of the same nominal diameter, and the self-locking performance is better.Mark 3. metric screw thread: M20-6H, M20 * 1.5LH-6g-40, where M represents a common thread metric, 20 nominal diameter thread is 20mm, 1.5 pitch, LH said, 6G 6H left, said thread precision grade, precision grade of internal thread uppercase, lowercase precision grade of said external thread, 40 screwing length;3.1. commonly used metric ordinary coarse thread pitch as shown in the following table (threaded hole diameter: carbon steel = nominal diameter P = nominal diameter cast iron; 1.05~1.1P; processing thread rod diameter = nominal diameter: 0.13P):Table 1 diameter / pitch of common metric coarse tooth threadThe nominal diameter of P cast iron bottom steel bottom thread rod diameter pitch P cast iron bottom bottom rod diameter of external thread steel
Hydraulic pipe fittings - thread standard twoClassification of threadsThe 1. threaded internal and external threads two;2. according to the shape of teeth can be divided into: 1) triangular thread 2) trapezoidal thread 3) rectangular thread 4) sawtooth thread;3. by line, single, head and multi thread;4., according to the direction of rotation, two kinds of left and right threads, the right is not marked, left plus LH, such as M24 * 1.5LH;5. according to different uses are: metric common thread, thread sealed pipe thread, non threaded sealing pipe thread, 60 degrees taper pipe thread, metric taper thread, etc.Two. Metric general threads1. metric screw thread with a capital M, tooth type angle 2 degrees =60 (alpha tooth type half angle);2. metric ordinary thread by pitch, coarse teeth, ordinary thread and fine teeth, two kinds of ordinary thread;2.1. coarse tooth ordinary thread mark generally does not indicate the pitch, such as M20 means coarse thread; fine tooth thread mark must indicate the pitch, such as M30 * 1.5 for fine tooth thread, in which pitch is 1.5.
The cleaned pipe shall be installed and filled as soon as possible(1) connect all the pipes in line by the print mark;(2) the fourth chapter according to the method of fastening all pipe joints, pay attention to remove the O-ring into the original;(3) all piping shall be firm and not loose;(4) all the oil pipes can be connected to the distributor, the oil outlet and the lubrication point until they are filled with grease
