Hydraulic cylinder assembly notes

  First, the preparation work

(1) the tools and equipment used in the assembly, the cleaning oil must be ready, the assembly work table and the site to keep clean.

(2) the parts to be installed must pass the qualification examination, the burr, flash and dirt on the parts should be removed.

Two, assembly points

Assembly of hydraulic cylinders, the first part of the seal should be loaded into the relevant parts, and then from the inside to the outside of the installation, the installation should pay attention to the following points:

(1) no damage to seals.

When assembling the sealing ring, it should be noted that the sealing ring can not be scratched by burr or sharp angle, especially with the lip of the seal ring and the new type of coaxial seal, in particular, should pay attention to. If there is a vent or oil hole on the inner wall of the cylinder, check and remove the burr. The cylinder and the oil inlet hole and the air exhaust hole communicated with parts of soft material in, reload the piston assembly to seal through the orifice when scratching and crush. And check with the sealing ring contact or friction of the corresponding surface, such as scratches, must be grinding, correction. When the sealing ring through the threaded part, in thread roll up a layer of plastic film (Figure 1), the plastic tape coated with some grease, and then install.

In the hydraulic cylinder assembly process, the cleaning liquid composition containing antirust oil or washing, each part can be washed, and then dry with compressed air in the cylinder surface and the sealing ring apply some grease (recommended butter). In this way, the sealing ring can be easily loaded, and the sealing ring can not be damaged when assembled.

(2) to properly install the sealing device everywhere, do not mistake the installation direction of the sealing ring, installation can not produce the phenomenon of twist extrusion.

O (a) when installing the ring, do not pull it to the extent of permanent deformation, and do not roll edge package, or may be distorted due to the formation of oil spills.

V (b) to install the Y shape and the shape of the sealing ring, should pay attention to its installation direction, to avoid the installation of oil instead. On the Y shape sealing ring, the lips should be facing the pressure of the oil chamber; in addition, Yx shaped sealing ring should also pay attention to the distinction between the shaft or the hole, do not install the wrong. V ring, support ring by different shape sealing ring and a press ring, when the pressure ring sealing ring, support ring can make the sealing ring deformation and sealing function, the installation should be seal ring opening for pressure oil chamber; adjust the pressure ring, should be limited to not leak can not be pressed too tight, sealed to prevent excessive resistance.

C sealing device, such as the sliding surface with the assembly should be coated with appropriate amount of hydraulic oil.

O (d) after the removal of the sealing ring and the sealing ring should be replaced.

(3) after assembling the piston rod and piston, it is necessary to ensure the concentricity and straightness.

(4) after the piston assembly is loaded into the cylinder, it should be ensured that it is flexible in the cylinder, without blocking and uneven.

(5) when the assembly guide sleeve, cylinder head and other parts are blocked, they can not be pressed or beat hard.

(6) when the cylinder head is connected with the screw, the force of the cylinder head is forced in turn, and the force is uniform, so that the piston rod can move freely in the full range of motion. After tightening, then tighten the torque wrench again, in order to achieve the appropriate tightening torque and torque consistency.

Three, pollution control

(1) the hydraulic parts are assembled by the "dry assembly" method, that is, after cleaning the parts, in order not to make the cleaning fluid to retain the surface of the parts and affect the assembly quality, should be on the surface of the parts after the assembly.

(2) hydraulic parts assembly, such as the need to combat, prohibit the use of iron can be hammered with wooden hammer, rubber hammer, copper and copper (Figure 2).

(3) do not wear gloves when assembling, do not wipe the mounting surface with a cloth to prevent the intrusion of fiber like dirt.

(4) hydraulic components has been assembled, the component shall be carried out when assembled, all of them should be the oil port bulkhead block (Figure 3), and covered with plastic film to be assembled components (Figure 4).

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