1. Prevent impurities and dirt from entering the system The hydraulic system is powered by hydraulic oil. Its hydraulic components such as pumps, valves, cylinders, and motors have good mating surfaces between the pairs of motion components. The machining accuracy is high and the surface roughness is small. There are many small holes, throttling gaps, and tiny holes in the element. Therefore, keep the hydraulic oil clean during use and prevent contamination of contaminants. Otherwise, the system components will be damaged, the service life will be reduced, and various failures will occur. Such as scratching the surface of the hydraulic component movement, to accelerate the wear of relative moving parts, so that the leakage increases; impurities will be stuck in the spool, so that the spool failure; impurity will be safety valve or return valve pad and drain, resulting in the promotion of farm tools Slow; may not work properly; make the fuel tank filter blocked, causing the pump to empty or system overload; dirt will also make the oil deteriorate quickly and lose good performance. According to the survey, at least 75% of the failures in the hydraulic system were caused by impurities in the oil. The main measures to prevent oil contamination include the following: 1) Before installation, except that the pipes must be cleaned and the ears must be cleaned, the castings must be thoroughly cleaned, including mechanical cleaning and chemical cleaning (such as cleaning in trichloroethylene, and then using compression. Air blow dry; all components can be washed with kerosene before assembly, but it is forbidden to wipe with fabrics with fibers (eg cotton yarn). 2) After the hydraulic system completes the final assembly, it should be contaminated by the empty circulating dirt, and then restored after cleaning. 3) The fuel tank should be sealed reasonably and the air filter should be installed in the atmosphere. The seal must be reliable. It is forbidden to use oil-resistant seals and hoses. 4) Periodically replace the hydraulic stains. The used hydraulic oil should be cleaned. Clean the filter on time. The filter and copper pads must not be damaged when the cleaning ear listens. 2. Preventing air from entering the system air into the low pressure pipeline will generate cavitation, making the oil discontinuous and affecting party work. When the air enters the high pressure pipeline, it is compressed rapidly under the impact of pressure oil, causing the hydraulic system to generate noise; and when the gas is suddenly compressed, it will emit a large amount of heat, causing local overheating, accelerating the temperature rise of the hydraulic fluid, and damaging the hydraulic components or oil. The liquid quickly deteriorates, which reduces the service life of the oil. In addition, due to the large air compressibility, the oil is discontinuous, the hydraulic system is unstable, the fuel tank is slowly lifted, or the vibrations occur during the lift, and even the implements cannot be raised. The main measures to prevent air from entering the hydraulic system are as follows: 1) Except for the discharge pipe, both the suction pipe and the return pipe should be inserted below the oil level, and keep enough concentration to prevent air from entering when the system stops working. 2) Always maintain the height of the oil level in the tank to ensure that the oil pump suction pipe is completely intruded into the oil. Each part of the system should also maintain the fullness of the oil. In the oil pump, a one-way valve can be installed at the outlet of the oil pump and a back pressure valve can be installed on the return oil line. 3) Keep a good seal of the fitting, especially the suction line. If the seal is not good and the oil pressure is lower than atmospheric pressure, the air will enter the hydraulic system from the defective seal. 4) The strainer or filter at the fuel tank outlet should be kept clean and cannot be blocked. Otherwise, under the effect of the oil suction of the oil pump, vacuum will be formed in the filter and the pipeline, so that a large amount of air is sucked from the filter and the pipe joint. 5) Before the hydraulic system works or after replacing the oil, exhaust 3 should be performed to prevent the hydraulic oil temperature from being too high. If no hydraulic pressure is found to be too high during the working process, it must be promptly searched for reasons to eliminate it. Otherwise, the following adverse effects will occur. Consequences and consequences: 1) The oil temperature is too high, the viscosity of the oil is reduced, the speed of the oil cylinder or the oil motor slows down, the agricultural implement is lifted slowly, and the oil return mechanism Han has a work; in addition, the lubrication performance of the oil is deteriorated, and the components are increased. Grinding operation. 2) If the oil temperature is too high, the oxidation of the oil will be accelerated, resulting in deterioration of the oil; in addition, precipitations such as asphalt precipitated in the oil will also clog pores or bulge, and the clearance will become smaller, affecting the movement of the spool. The possibility of being stuck; In addition, the rubber parts of the sealing device are rapidly deteriorated and the sealing performance is lost. In order to prevent the oil temperature from being too high, it should be done: 1) Before the worker checks the oil level of the fuel tank, when it is not enough, he must add fuel in time. 2) Correctly select the viscosity of hydraulic oil. 3) Clean the filter frequently to prevent clogging. 4) The dispenser handle should not be in the "up" or "pressure drop" position for a long time. 4, to prevent the hydraulic oil temperature is too low When the hydraulic oil temperature is too low, due to the increase in liquid viscosity, it may cause some failures, such as the suction pipe oil flow slowly forms a vacuum, inhaled air; oil pump suction is insufficient, the amount of hydraulic oil into the cylinder Inadequate, resulting in slower increase of agricultural tools; oil flow resistance increases, hydraulic loss, easy to form a plug phenomenon; return mechanism pressure drop, can not automatically return; valve malfunction and so on. For this reason, it should be noted that: 1) Use a hydraulic oil of suitable viscosity depending on the temperature. 2) Pre-heating before work, so that the oil temperature exceeds 20 degrees Celsius before starting work. However, it is not allowed to use an open flame to grill the hydraulic system, otherwise it is easy to produce a series of adverse consequences, such as damage to the rubber seal. 5, to prevent the system from overloading Although the hydraulic system has a safety valve from the plant protection, but the overload work, the safety valve is often in the unloading work state, easy to make the oil temperature rise, have adverse consequences; if the role of the safety valve failure, It will destroy the system. In order to ensure the safety of the system, Qing tried to prevent the system from working in an overloaded state.
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