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WHY IS THEHYDRAULIC BREAKER CYLINDER ALWAYS STRAINED?

The fit clearance between the piston and the cylinder is affected by factors such as material, heat treatment and high temperature. Generally speaking, the material will deform with the change of temperature. When designing the fitting clearance between the piston and the cylinder, the deformation factor must be considered. Otherwise, the small fitting clearance after heat treatment will easily lead to the piston strain.

The piston and cylinder of the hydraulic breaker are always strained. Do you know these reasons? The hydraulic breaker supporting the excavator is a must-have for construction now, and it brings a lot of convenience to the construction operation. The piston is the heart of hydraulic breaker hammer. Many customers do not understand the importance of the piston in the whole machine, and the cylinder will cause a lot of trouble. This article will explain to you the causes of cylinder strain.

What is a pull cylinder?

The friction damage between the piston and the cylinder is referred to as the cylinder

The reasons for pulling the cylinder are simply listed as follows:

1. The influence of hydraulic oil

(1) Influence of hydraulic oil temperature

When the temperature rises to a certain level, the dynamic viscosity of the hydraulic oil drops rapidly, and the ability to resist shear deformation is almost eliminated.

Affected by the dead weight and the inertia of the piston during reciprocating motion, the hydraulic oil film may not be established, so that the piston may not be established.

The hydraulic support between the cylinder and the cylinder is damaged, causing the piston to be pulled.

(2) Influence of impurities in hydraulic oil

If the hydraulic oil is mixed with pollutants, the gap between the piston and the cylinder will be affected, which will not only increase the friction between the cylinder and the piston, but also affect the hydraulic support between the piston and the cylinder, thus causing the cylinder to pull

2. Machining accuracy of piston and cylinder

If there is eccentricity or taper in the process of reprocessing and assembly between the piston and the cylinder, the pressure difference generated during the movement will cause the piston to receive lateral force, aggravate the friction between the cylinder and the piston, and cause the piston to be pulled;

3. Fitting clearance between piston and cylinder

The fit clearance between the piston and the cylinder is affected by factors such as material, heat treatment and high temperature. Generally speaking, the material will deform with the change of temperature. When designing the fitting clearance between the piston and the cylinder, the deformation factor must be considered. Otherwise, the small fitting clearance after heat treatment will easily lead to the piston strain.

4. The chisel is biased during the working process of the hydraulic breaker

In the actual working process of the hydraulic breaker, the phenomenon of partial strike of the drill rod often occurs, which will generate lateral force and cause the piston to be pulled.

5. Low hardness value of piston and cylinder

The piston is affected by external force during movement, and due to the low hardness of the surface of the piston and the cylinder, it is easy to cause strain. Its characteristics are: shallow depth and large area.

original source: https://www.hmbhydraulicbreaker.com/news/why-is-thehydraulic-breaker-cylinder-always-strained/

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