Maintenance points of piston rod, hollow double piston cylinder manufacturer will answer your questions

Manufacturers of hollow double-piston cylinders believe that if the piston rod is improperly operated, it is prone to scratches and abrasions, which will inevitably affect its performance. So how should this problem be solved? When the piston rod cracks, it should generally be scrapped; the cylindrical surface of the piston has suffered limited wear due to the friction of the piston ring, so it is usually not repaired; when the diameter of the boring cylinder increases, a new plug should be selected based on the increased diameter. Repairs should only be made if the piston is worn or if the piston ring grooves and cylindrical piston pin bore are worn.

The hollow double-piston cylinder manufacturer believes that if the piston rod is scratched, bruised, etc. Can be processed using files. First, grinding wounds and nodules can be carefully filed with a file, and then polished and lubricated with a whetstone. After treatment, a hydraulic pressure test should be carried out. The water pressure is generally the working pressure . 15 times Keep it for 10 minutes without leakage or residual deformation. The piston rod will inevitably have some failures in daily use, so how should we check and prevent the piston rod?

1. Under normal circumstances, a thin layer of carbon deposit is allowed on the piston top and piston ring set, and the color should be black or gray. If there is too much carbon deposit, the hard carbon layer will remain after wiping off the floating carbon, which will be difficult to remove. You should consider checking whether the gasoline contains too much lead or the lubricating oil is of poor quality.

2. The manufacturer of the hollow double-piston cylinder believes that there should be no scars on the top surface of the piston. This may be caused by valve collision, loose connecting rod big end bearing or excessive fitting clearance of the crankshaft main bearing.

3. If there are twists and turns on the top surface of the piston, it may be due to thermal creep of the piston made of aluminum alloy above 350°C, mostly due to local high temperature and local large pressure gradient caused by slight detonation.

4. After the piston surface is clean, we can visually inspect the carbon deposits on the top surface to see if there is any fault.

5. Carbon deposits are not allowed in the oil return hole and skirt of the piston. Otherwise, the roundness of the cylinder and the light leakage of the piston ring in the cylinder should be checked to find out the cause of oil leakage.

Hollow double-piston cylinder manufacturers believe that if piston rods are produced in small batches, in order to effectively improve production efficiency, free forging blanks should be used as much as possible. However, when the blank is made by free forging, the size and shape of the blank need to be judged:

1. Shape. Generally speaking, if piston rods are produced in small batches, try to choose cylindrical blanks. However, due to different requirements for machining accuracy of different parts, the dimensional tolerance level of forgings needs to be set at level 8-12.

2. Size. Since the blank is free casting, according to the proportion requirements of the piston rod part drawing and the actual processing requirements, the casting size should be set to 62 mm in diameter and 1150 mm in length, then the blank size should be: 80 mm in diameter and 760 mm in length.

Hollow double-piston cylinder manufacturers believe that after determining the manufacturing method, size and tolerance of the blank, the piston rod should be turned, shaped and ground first. However, when turning and grinding, the center holes at both ends must be used as a precise reference for positioning (in line with the principle of unified reference). The center hole can be machined first and then rough turned.