(1) serious tank tank temperature plays a “hot flywheel” effect, can prevent the absorption of heat in the short term, it can be prevented in the cold environment of the hydraulic system of short-term idling is excessive cooling, but the tank is still the main contradiction “warm l. ” The temperature rise will result in severe multiple hydraulic system failure. The causes serious tank temperature.
(2) severe fuel tank fuel tank temperature plays a “hot flywheel” effect, can prevent the absorption of heat in the short term, it can be prevented in the cold environment of the hydraulic system of short-term idling is excessive cooling, but the tank is still the main contradiction “warm l. ” The temperature rise will result in severe multiple hydraulic system failure. The causes serious tank temperature.
① Gao tank set up in the vicinity of radiation temperature, ambient temperature, Gao, and molten plastic injection molding machine. With a high-power heating means are provided in this environment
② various hydraulic system pressure loss, such as overflow losses, throttling losses, losses along the pipeline and local losses, caused by the oil temperature will be converted into heat
③ oil viscosity inappropriate choice, too Gao or too low.
④ tank design and inadequate cooling area. Way to solve the serious rise follows.
① try to avoid the heat, but the plastic machinery 〖such as injection molding machines, extruders, etc.) because they have to melt the plastic, there must be a “source.”
② proper design of the hydraulic system, such as system should uninstall the loop, using the pressure, flow and power matching circuits and other high hydraulic accumulator system, to reduce the overflow losses, throttling losses and pipeline losses, reduce heat rise
③ Select Gao efficient components, precision machining and assembly efforts to raise Gao precision hydraulic components, reducing leakage losses, the volume of losses and mechanical losses caused by heating phenomenon.
④ correct piping: reduce too small for too long, too much bending branches along with the bus improperly brought loss and partial loss.
⑤ Select the correct oil viscosity.
⑥ tank design should be considered when there is sufficient heat dissipation area A.
(3) the oxidative degradation of oil produces oil tank oxidative degradation and oil type, temperature, rest time and the presence of the oxidation catalyst related. When selecting seed oil according to the working conditions and working environment, select species and performance in line with the oil viscosity, temperature at 30 ~ 55 ℃ rest means: Do not break too short, otherwise it will accelerate the deterioration of oil oxidation.
(4) inside the fuel tank oil tank oil pollution contaminants from outside intrusion, there is internally generated, there are remnants of the assembly.
① assembly remaining pieces such as peeling paint, welding slag. Before cleaning the tank assembly must be strictly surface and go strictly to rust oil, and then paint the inner wall of the tank.
② from outside intrusion of dust seal should be noted that at this time the tank and install air filter and air at the top of the tank connected, so that the air is filtered before entering the tank. Often doubles as a fuel inlet air filter, now have been standard parts (EF type) for sale. Can be equipped with about 100 mesh copper mesh filter to filter added to the oil tank; also useful filter paper core, the better, but the atmosphere’s ability badly, so Zhixin larger capacity cartridges. In order to prevent outside intrusion of dirt inside the tank is sucked into the pump, the fuel tank to install partitions, to separate oil return area and absorbing areas. By partitions, extended back into the oil tank time to rest, to prevent oxidative degradation of oil, on the other hand is also conducive to the precipitation of dirt. Separator for oil level height of 3/4, as shown in Fig 3-88. Tank bottom should be tilted floor depending on the degree of tilt tank size and viscosity oil used, are generally set at the lowest part of the tank bottom drain plug at the bottom of the tank so that the accumulation of dirt to get cleared. Distance from the floor most of the suction pipe from Gao to be 150 plus 10 more, to prevent dirt being sucked people, as shown in Figure 3-89.
③ reduce contamination within the system generates a fuel tank to prevent condensation of moisture produced: it is necessary to select a sufficiently large capacity air cleaner, so that the heated air from the tank top as quickly as possible, does not condense into the cold water tank cover beads drop in the tank; the other large-capacity air cleaner or air vent, the top of the tank to eliminate the difference in space and atmospheric pressure, and prevent the top layer is lower than atmospheric pressure, from the outside into the dust. b. Use a good anti-rust performance lubricant reduces wear and rust generated material.
(5) oil tank air bubbles are difficult to separate oil return due to agitation in the tank, and easy to produce bubbles suspended in the oil folder, if they are with a person of the hydraulic system will generate a lot of it is chant (such as pump noise, cavitation and hydraulic cylinder crawling, etc.]. In order to prevent air bubbles in the fluid before it is sucked not eliminate the human pump. Set partition separated zone and back to the oil pump suction area, back to the oil separator was baffled, slow flow rates, which will help the bubble separation and the oil spill. But in this way is difficult to separate fine bubbles, the separation efficiency Gao.