2 fish spur logic flow and hydraulic system analysis method.
For example, in the casting line, after the new dust ring is replaced by the hydraulic cylinder of the sand compactor, the plunger stops moving under the impact when starting, and the restart is still the same.
It can be analyzed according to 1 box. Horizontally press the person already, in order, and vertically press the arrow to point to the search. After searching and testing, it was found that insufficient pressure was the main cause of failure. The working pressure is the same as before the replacement of the dust ring. Although the external load is not increased, the piston rod movement resistance increases due to the excessive compression of the lip and the plunger surface of the new dust ring. The pressure value of the relief valve is increased from 6 to 3 to 6.3 river 3, and the movement of the compacting plunger cylinder returns to normal.
example. Various reasons for the crawling of the grinding table are marked on the fishbone, and then analyzed and tested to confirm the main reason.
In addition, the corresponding protection measures are taken on the load of 0 output, which can reduce the line interference noise, protection, Huangfu cough, improve the service life of 10 control systems.
Because the user does not have the ability to repair the main control board, the failure of the main control unit in 0, such as the 0-port failure, is best repaired by the replacement method, that is, replacing the faulty board with a new main control board, which can make the repair work quickly and minimize Downtime. Therefore, it is necessary to reserve a fixed number of spare parts.
Communication address Xi'an Xingfu South Road No. 1 Zip code 710043 telephone 029 from which can be initially determined that the main cause of crawling failure is hydraulic pump suction oil temperature is too high, oil viscosity is too low, poor lubrication performance, hydraulic cylinder assembly accuracy is poor, hydraulic cylinder axis and The guide rails are not parallel and the frictional resistance is uneven.
The fishbone analysis method can be widely used because it can closely combine equipment maintenance management with fault diagnosis.
The logic flow analysis logic flow is based on the basic principle of hydraulic system engineering to carry out logic analysis, reduce the suspect object, gradually approach, and finally find out the location of the fault, and analyze the cause of the fault.
The computer is used to find the fault location of the hydraulic equipment and the cause of the problem has been researched and applied. It is the logic diagnosis process designed by the fault diagnosis expert to make a logical judgment on the cause of the fault, and to find out the cause of the fault step by step. The logic flow is programmed into the computer for storage. When a certain part is in an abnormal state, the location and cause of the fault can be found in time by means of a computer, and the analysis and understanding of the iron group company's motorized phase of the city, the so-called evaluation hydraulic system that generates the fault is hydraulic and Advancement is the setting of hydraulic system, such as temperature rise noise impact, etc., which are not fully considered and are not excluded when appropriate.
In the following, the use of the hydraulic cylinder in the 3 hydraulic system is taken as an example to illustrate the use of the logic diagnosis process.
Hydraulic System Analysis Method The application of hydraulic system to analyze the cause of the fault is the basic method currently widely used. It is the basis of fault diagnosis, and other methods are based on this. Therefore, mastering the hydraulic system principle is the basic condition for fault diagnosis and elimination.
1. Understand the hydraulic system. The hydraulic system of the reading station hydraulic system solves the author's ideas and design intentions.
1 Understand the working conditions. It is to analyze the requirements of the load on the force speed stroke position and the duty cycle. Analyze how the designer of the hydraulic system is required to ensure these conditions of the load.
A general understanding of the structure of the hydraulic system. What are the circuits of the hydraulic system, what are the characteristics of each circuit, how the circuits are merged between the circuits, and so on. All of this must be made clear that if a place is misunderstood, it is impossible to effectively eliminate the failure of the hydraulic system.
It is necessary to confirm the function of each component and the adaptability to the hydraulic system, that is, each component must meet the requirements of the hydraulic system; it is necessary to understand the structural principle of the hydraulic component itself and its quality indicators. In addition, you should also understand the cleanliness of the oil and the level of filtration and purification.
Whether it does not meet the requirements of hydraulic system design, low level of installation and debugging, hydraulic system motor dynamic balance is not 0, voltage and current are unstable, motor speed, hydraulic pressure, creeping, irregular rail surface, non-clean rail contact surface, uneven friction, uneven assembly accuracy, hydraulic cylinder Friction guide surface with human hydraulic cylinder is not parallel Oil pump output pulsation Large guide rail clearance is small or pressure plate is adjusted too tight Piston rod rigidity difference Oil pollution serious Pipeline resonance Hydraulic cylinder internal and external leakage Lubricating oil source Abnormal stabilizer failure Rail surface lubrication Oil tank uneven or unreasonable temperature rise causes viscosity change When the pressure valve is damped, the pressure valve is oscillated, the pressure is pulsating, the back pressure is adjusted improperly, the guide rail is not uniformly distributed, the new hydraulic system is installed, or the downtime is too long. The difference in viscosity of the lubricating oil is unreasonable. The oil lubrication performance is poor. The oil number is not correct. The oil pipe is exposed. The oil is lubricated at the time of idling, and the pump cover is pumped. , and the suction port joint suction port and the seal is poorly close to the oil port too close and there is no intermediate baffle grinder work table crawling. The current 4 tank liquid level low suction pipe is not deep enough under the oil surface. The serious passing capacity is less than the specified position i+i The oil absorption filter has poor ability to pass through the air into the air when crawling irregularly and the amplitude is large. The suction pipe is too fine. The hydraulic cylinder has no action to communicate with the hydraulic cylinder. The pressure regulating spring is bent and broken. The work must understand the characteristics of the design of the installation and commissioning system. Reasonable defects, even wrong ones, are often easier to grasp the reason for the replacement of the purification or replacement inspection and analysis of the reasons for the design, the exclusion check solenoid valve
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