What are the preparations for the fault diagnosis of the hydraulic system of construction machinery?
Due to the poor construction site conditions, do not have the hydraulic system testing equipment, in the field diagnosis of construction machinery hydraulic failure, requiring equipment maintenance personnel using simple and practical methods to solve the problem.
Fault diagnosis should abide by the principle is: in an analysis to determine the fault location and scope, to follow the easier after the first principle, prohibited any blind demolition, collapse or adjust the hydraulic components, so as not to cause trouble or expand the scope of new fault, the original fault complex.
Preparation of fault diagnosis
Hydraulic equipment is composed of mechanical, hydraulic, electrical and instrument units. The system fault analysis is a complex problem affected by various factors. So the fault analysis must have a clear understanding of the whole hydraulic system working principle, structure characteristics, and then according to the fault phenomena of judgment, step by step, purpose and direction to gradually narrow the scope to determine the area of the site, until an element.
(1) using the sense organ of human to make preliminary diagnosis of the equipment, that is, listening, smelling, touching, looking, asking. Listen - listen to the noise, such as sound, suction friction sound, vibration and sound, knocking; smell that smell smell, odor, such as oil, rubber friction plate burning overheating; touch --- using elements of system temperature, touch vibration etc.; see, observe the the movement system velocity component size speed, thrust, rotary torque, hydraulic pipe fittings, valve plate joint, hydraulic cylinder, hydraulic pump cover shaft end such as oil spills, and the piston rod and tubing beating; ask - access equipment operator, understand the equipment usually operation, especially fault after the abnormal situation.
(2) read the hydraulic system diagram. Using hydraulic system diagram to analyze the cause of failure is the basic method adopted by engineering and technical personnel at present. It is the basic condition of fault diagnosis and elimination to master hydraulic system principle diagram carefully. To understand the structure of the hydraulic system, to know what the hydraulic system is composed of loops, what is the characteristics of each loop, the circuit is how to dissolve into one, and so on. If the hydraulic principle diagram of some of the equipment has been unable to find, requires maintenance personnel according to the actual situation of the equipment, repeatedly pondering scrutiny, understand the designer's intentions and ideas, draw the part grass equipment principle diagram of hydraulic system, in order to accurately diagnose the trouble.
