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How to add hydraulic oil to the electro-hydraulic push rod How to add hydraulic oil to the electro-hydraulic push rod The electro-hydraulic push rod is attributed to hydraulic transmission, so it cannot do without hydraulic oil. Therefore, hydraulic oil is the working medium of the electro-hydraulic push rod. The elastic actuator is realized by controlling the forward and reverse rotation of the motor. Electro-hydraulic push rods should select different hydraulic oils according to the requirements of the operating environment. Generally, there are two trademarks of hydraulic oils: 32# and 46#. Select according to the operating pressure of the system For conventional electro-hydraulic push rods, those with the highest operating pressure below 3.5MPa or 8 MPa can choose general hydraulic oil (46# hydraulic oil). If the operating pressure of the special electro-hydraulic push rod is 10MPa or more, or the pressure fluctuates violently, use anti-wear hydraulic oil (but general hydraulic oil may also be used in medium and high pressure systems with a pressure of 8MPa-16MPa). For high-pressure systems above 16MPa, use high-grade anti-wear hydraulic oil with good abrasion resistance to reduce conflict wear. Select according to the operating environment temperature The upper limit of the operating temperature (thermal equilibrium temperature) is 60℃ or 70℃, or the electro-hydraulic push rod is around 80℃, and the lower limit is -20℃, or the temperature change is larger, and hydraulic pressure with higher viscosity index can be selected. Oil (low temperature hydraulic oil, thickened hydraulic oil, etc.). If the lower limit of operating temperature is -30℃, low temperature hydraulic oil or aviation hydraulic oil (32# hydraulic oil) should be used in severe cold area. In short, the freezing point of the hydraulic oil used must be more than 10°C lower than the temperature of the environment. It is necessary to ensure that the hydraulic oil still has the necessary low-temperature fluidity at the ambient temperature to ensure that the electro-hydraulic push rod starts at low temperatures. If the upper limit of the operating temperature exceeds 70℃ or 80℃, consider the use of fire-resistant hydraulic fluids such as phosphate esters and fatty acid esters with good thermal and chemical stability. The domestic industry commonly speaks of "South 46" and "North 32" (namely, South 46# hydraulic oil, North 32# hydraulic oil). The trademark of hydraulic oil refers to the different viscosity of the oil. How much hydraulic oil is required for the first use of the electro-hydraulic push rod? It can be seen from the composition of the electro-hydraulic push rod that the hydraulic oil is provided to the hydraulic oil pump, and the motor drives the hydraulic pump. Therefore, the first time it is used, the hydraulic oil is injected. Make it flow over the hydraulic oil pump, start the motor to drive the hydraulic pump to fill the entire cavity with hydraulic oil, and then add an appropriate amount of hydraulic oil to make the oil level higher than the oil pump. The electro-hydraulic push rod insists on not running out of oil.
Three problems in using hydraulic cylinder If the hydraulic cylinder can maintain the normal working condition, then can help us to complete a lot of work tasks, and if there are some problems, it will affect the normal performance of its work, so as a user, we need to find out the specific reason in time and deal with it. Below we pass a few problems to analyze the operation of hydraulic cylinder matters needing attention. The first problem, the hydraulic oil in the hydraulic cylinder presents the problem how to do? Trust that every user friend knows, and very clear understanding of the importance of hydraulic oil for the entire system. And in the operation, if the hydraulic oil appears muddy rust color or mixed with a certain amount of water, we must cause attention. In fact, if there is such a problem, we think it is probably due to the simultaneous sealing of the problem. At this time we need to see whether there is oil in the water system, if found seal ring damage should be replaced in time. Second question, in the hydraulic system the main hydraulic cylinder Piston Rod presents the vibration question how to return a responsibility? When encountered in the operation of this problem, we need to carry out a full view, the first to see whether there is a problem of low oil level, such as the need to increase to regular oil level; Secondly, we should check whether there is air leakage in the oil suction system of the main oil pump; thirdly, we should check whether the v-shaped sealing ring of the pushing mechanism is too tight; finally, we should check whether the oil temperature of the hydraulic cylinder is too high. The final question is, what if the temperature of the hydraulic oil used in the hydraulic cylinder is too high? If the operation presents this problem, a time we are very difficult to determine the specific reasons, at this time also need to carry out a series of ability to find specific reasons. Check whether the hydraulic cylinder of the hydraulic pump is in normal load condition; check whether the main relief valve is faulty and often overflow; check whether the hydraulic oil is overheating, sticky and other issues.
Introduction of connecting Structure Between Piston and Piston Rod in hydraulic cylinder manufacturer Hydraulic cylinder manufacturers, in fact, connecting Piston and Piston Rod, we can choose a lot of different methods. In this way, it is equivalent to give us a greater degree of selection. For different users, due to the different environmental conditions, so in the selection of Hydraulic Cylinder Piston and Piston Rod joint structure will have different requirements. So, as it stands now, what is the most commonly used link structure first? Hydraulic Cylinder Manufacturers Think, now more commonly used connection structure is a nut (grain) type, compared to this method of connection has a lot of advantages, including, first of all, the connection is stable and reliable, and between the Piston and the Piston Rod there is no axial service requirements, but its disadvantages lie in the processing and installation of thread is more trouble. In addition, there is a link structure called the welding type. The manufacturer of the hydraulic cylinder explained that the connecting structure is relatively simple and convenient to operate, but the disadvantage is that it is not convenient to dismantle, the requirements for the coaxiality and straightness of the inner and outer diameter of the Piston, the diameter of the Piston Rod of the hydraulic cylinder and the four surfaces at the joint of the end face are higher. In addition to the above two methods of connection structure, there is a called clasp (key) type. According to the hydraulic cylinder manufacturer, this kind of connection structure is also very simple, and the disassembly type is also relatively convenient. The Piston has a small amount of floating by means of the radial clearance, and it is not easy to cause the problem of sticking. However, this will lead to axial service between the Piston and the Piston Rod, it may also cause unnecessary movement of the Piston and Piston Rod. In general, this method is widely used in low speed hydraulic cylinder. According to the hydraulic cylinder manufacturer, in fact, in addition to these linking structures, there are some other structural methods actually used, such as split (combined) structural methods, etc. . Different methods have different advantages and disadvantages, in the selection of time also need to be compared.