사출 성형기 유압 시스템의 고장 가능성 및 진단 단계

When using an injection molding machine, 사출 성형기의 유압 시스템의 고장 가능성은 다양합니다.. 여러 가지 요인이 복합적으로 작용한 결과입니다, 그리고 분산이 상대적으로 크다.. 그러므로, 결함 진단을 수행할 때, 고장을 일으키는 요인을 하나씩 분석하는 것이 필요합니다., pay attention to their internal connections, and find out the main contradictions, so that they can be resolved relatively easily.

정상적인 상황에서는, the failure of the hydraulic system of the injection molding machine is not accidental. Any failure will be accompanied by various abnormal signs before it evolves into a major failure. These signs can be summarized as:

(1) There are abnormal sounds, such as pumps, motors, and thermostatic valves.
…
(2) The operating speed of the hydraulic motors for slewing, walking, and hoisting, as well as the hydraulic cylinders of various working devices, is reduced and weak.
…
(3) The oil tank level drops and the oil deteriorates.
…
(4) Oil leakage occurred on the outer surface of hydraulic components.
…
(5) The oil temperature is too high.
…
(6) Pipeline damage, looseness and vibration occur.
…
(7) The smell of focal nucleus appears and so on.
All of the above phenomena can be discovered by naked eye observation, hand touch, and nose smell as long as you pay careful attention during use. In actual work, people use this on-site method as the first-hand information to analyze the failure, and then based on experience, synthesize these first-hand information to analyze the actual problem and find out the cause of the failure as early as possible. Be resolved.

하지만, in actual work, it is often impossible to accurately diagnose the cause of the failure at one time. 이때, several iterations are required, 그건, repeated analysis and repeated inspections until the cause of the failure is found.

…
In actual work, engineering and technical personnel often follow the following steps to deal with faults in the hydraulic system.
…
(1) Understand the system
When a certain 사출 성형기 has a hydraulic failure, you should first understand the hydraulic system. It is to be familiar with the relevant technical data and reports, understand the working principle of the liquefied gas pressure system, understand the basic structure of various components and the specific functions in the system, and be able to find out the liquid flow process under various working conditions. Before inspecting the equipment, observe the working conditions of the system and record the necessary technical data, such as working speed, 압력, 흐름, 사이클 시간, 등.
(2) Ask the operator
Interrogate the operator operating the malfunctioning injection molding machine. Ask about the characteristics of the equipment and its functional characteristics; ask about the basic phenomena when the equipment fails, such as whether the hydraulic pump can be started, whether the system oil temperature is too high, whether the system noise is too high, whether the hydraulic cylinder can drive the load, 등.
…
(3) Verify the phenomenon provided by the operator and check carefully
The phenomenon proposed by the operator is further verified by observing the meter readings, working speed, listening to the sound, checking whether the oil and actuators have malfunctions, 등.; then, according to the fluid flow in the system, look carefully along the loop from the tank in turn, and on time Record the observation.

During the inspection, carefully check the oil in the fuel tank to determine whether dirt enters the system. Affect the normal operation of each component of the system; touch it by hand to check whether the oil inlet pipe and high-pressure oil pipe are proliferated, softened, leaked, or damaged; check the pipe joints of the control components and the mounting screws of the housing if they are loose; finally check the oil and Piston rod of hydraulic cylinder. In each step of the inspection, attention should be paid to whether there is improper operation or maintenance to find the cause of the failure.
(4) List the possible causes of failure based on the information obtained from understanding, inquiry, verification and inspection
이때, it should be kept in mind that a failure phenomenon may be caused by two or more reasons. 예를 들어, the speed of the actuator may decrease, which may be due to the wear of hydraulic pump parts, or the internal leakage of the hydraulic cylinder may increase; 예를 들어, If the oil temperature is too high, it may be that the amount of oil in the oil tank is not enough, or that the oil pollution blocks the heat dissipation surface, or the pressure of the overflow valve is adjusted too high.
…
(5) Make a conclusion
According to the list of failure causes, the inspection sequence is arranged according to the principle of “easy first and then difficult”. First select those that can be restored to normal after a simple inspection or repair, so that the inspection work can be completed in the shortest time.
…
(6) Verification conclusion
Once through the above steps, find out the cause of the failure of the injection molding machine, start troubleshooting. Troubleshooting includes checking pressure and flow with appropriate test equipment, disassembling the casing cover, and checking pumps, motors and other components. These test inspections are the basis for judging the replacement of parts and hydraulic components. In actual work, there is often no suitable test device to carry out inspections. 이때, it is necessary to replace the pump, motor, hydraulic valve and other component assemblies as an effective means of troubleshooting.In the process of finding and troubleshooting faults, you should be careful, 주의 깊은, cautious, and strive to be accurate, avoid blindly disassembling parts, or use improper methods to deal with faults, so as to avoid new damages caused by this. Except when necessary, do not easily disassemble the hydraulic components, because unnecessary and premature disassembly and assembly will reduce the service life of these components.

유압 시스템의 이상적인 작동 온도는 다음 사이여야 합니다. 45 학위와 50 학위. 그 이유는 선택된 압력유 점도에 따라 유압 시스템이 설계되었기 때문입니다., 하지만 점도는 오일 온도에 따라 변합니다., 시스템 작업에 영향을 미치는. 구성요소, 오일 실린더와 같은, 유압 밸브, 등., 제어 정확도 및 응답 감도 감소, 특히 정밀사출기의 경우.
NS
동시에, 온도가 너무 높으면, 씰의 노화를 가속화하고 씰이 굳어지고 갈라지는 원인이 됩니다.; 온도가 너무 낮으면, the processing energy will be consumed and the operating speed will decrease. 그러므로, 유압유의 작동 온도에 세심한 주의가 필요합니다. 오일 온도가 높은 데에는 여러 가지 이유가 있습니다., 그러나 대부분은 오일 회로의 고장이나 냉각 시스템의 고장으로 인한 것입니다..
NS
Insufficient oil will cause the oil temperature to rise easily, and the air will easily dissolve into the oil, which will affect the oil quality and the normal operation of the hydraulic system. Insufficient oil is usually caused by oil leakage or loss during repairs. 이러한 이유로, you should pay attention to check whether there is any leakage. If necessary, replace worn seals and tighten loose joints as soon as possible. After maintenance, check the amount of oil in the tank and replenish it in time.

One of the important properties of hydraulic oil is its chemical stability, 그건, oxidation stability. Oxidation is the most important factor that determines the effective service life of hydraulic oil. The insoluble matter such as wood tar, sludge and carbon residue generated by oxidation will contaminate the hydraulic system, increase the wear of hydraulic components, reduce various gaps, block small holes, and eventually cause The hydraulic system is malfunctioning.

The oxidation rate of hydraulic oil depends on many factors such as itself and working conditions, among which temperature is one of the main factors. 그러므로, it is necessary to use suitable hydraulic oil and regularly check the oxidation degree of the hydraulic oil (judged from the darker color of the oil itself) ), it is absolutely necessary to actively change the oil after a certain number of working hours.　　
NS
During the use of the 사출 성형기, always check the pressure oil level, the pressure of the oil pump and the cleanliness of the pressure oil. When encountering wet weather, the concentration of the pressure oil must be checked daily, and the water pipes must be checked frequently to prevent water from being mixed in. In the pressure oil, the oil filter is blocked. Check the fuel tank frequently to keep it clean to prevent debris from falling in. Replenish pressure oil on time.
For the lubrication of the moving parts, the travel switch, the tightening of the screws, and whether the oil hoses and joints are leaking, they should be routinely checked once a week to keep them in good condition. If they are loose, they should be replaced or tightened.　　
…
게다가, if a pressure oil is used for too long or too long, the pressure oil can be replaced, so as to extend the life of the oil switch, oil pump and sealing ring.