1. Coaxiality error
In the hydraulic cylinder, coaxiality error could result in the unstable running speed of the cylinder.
2. Components manufacturing precision
The manufacturing precision in the hydraulic cylinder inside wall and piston rod surface have serious impacts on the stability of the hydraulic cylinder at low running speed, such as straightness.
3. Sealing materials
In the hydraulic cylinder, sliding friction of surface is directly influenced by the strength, hardness, and following performance of adopted sealing materials, led to the change of running speed of cylinder.
4. Air mixed in hydraulic cylinder
Air mixed in hydraulic cylinder would change the volume of piston rod under the pressure. Moreover, it may even cause gas explosions under high pressure, which could lead to the instability of cylinder running speed.
5. Improper design of intervals in the hydraulic cylinder
The pressure distribution of the sliding surface uneven, the fraction uneven, and hydraulic cylinder stick-slip at low speed which are attributed to the improper design of sliding fitting intervals between the internal piston and cylinder block, the hydraulic cylinder piston rod and the guide sleeve, as well as the tolerance in manufacture.
1.The coaxiality of piston and piston rod should be adjusted appropriately.
2.Ensure the manufacturing precision in the hydraulic cylinder inside wall as well as the piston rod surface must be in the appropriate range.
3.Just replace them when the problem is caused by sealing materials.
4.Adding air exhausting devices so as to remove air.
5.Intervals between the internal piston and cylinder block, the piston rod and the guide sleeve, should be all adjusted appropriately.