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The main function of the hydraulic oil tank is to store the oil. In addition, it also plays a role in the heat dissipation of the oil, the precipitation of impurities and the escape of air in the oil. According to whether the liquid level of the fuel tank is open to the atmosphere, the fuel tank can be divided into two types: open type and closed type. Open oil tanks are used in general hydraulic systems; closed oil tanks are used in underwater hydraulic systems that have strict requirements on working stability and noise.
The capacity of the oil tank must ensure that when the equipment stops running, the oil in the system can all return to the hydraulic oil tank under its own weight. The effective volume of the fuel tank (the volume of the fuel tank when the height of the hydraulic oil tank is only 80% of the height of the hydraulic oil tank) is generally more than 3 times the flow rate of the pump per minute (1.5 to 2 times for the walking device). Generally, in a low-pressure system, the effective volume of the fuel tank is 2 to 4 times the flow rate per minute, and for a medium-high pressure system, it is 5 to 7 times the flow rate per minute; if it is a high-pressure closed circulation system, the effective volume of the fuel tank should be externally circulated. The amount of oil or supplementary oil depends on the amount of oil; for a hydraulic system with a large workload and long-term continuous operation, the capacity of the oil tank needs to be determined by calculation according to the calorific value of the hydraulic system.
(1) Store enough hydraulic working medium required by the hydraulic drive system;
(2) Provide installation locations for components in the hydraulic transmission system;
(3) Precipitating pollutants in hydraulic working medium;
(4) Escape the air that penetrates into the hydraulic working medium;
(5) It should be able to effectively prevent the intrusion of external pollutants;
(6) Dissipate the heat generated during the working process of the hydraulic transmission system.
Hydraulic oil tank is a special container, in addition to storing hydraulic oil, it also has the function of dissipating heat and depositing grease. Therefore, in addition to cleaning the oil tank of the hydraulic oil tank, the upper cover cannot be opened casually, and an air filter is arranged on the oil tank to make the atmosphere communicate with the air in the oil tank through the filter. The hydraulic oil tank is generally composed of main components such as quick refueling joint, air filter, thermometer, oil level gauge, oil suction self-sealing device, tank body, and sewage valve.
The purpose of each component is as follows:
·Air filter: prevent foreign matter from entering, filter the air, and balance the pressure between the fuel tank and the atmosphere.
·Oil level gauge: used to observe the amount of oil in the oil tank. When the pump is working, the oil level must be above the middle position of the oil level.
·Thermometer: Displays the hydraulic oil temperature.
·Quick refueling joint: used for refilling hydraulic oil.
·Drain valve: It is used for draining dirty oil when cleaning the fuel tank. It is usually closed.
According to the structure, it can be divided into integral hydraulic oil tank and separate hydraulic oil tank; according to the shape. It can be divided into rectangular hydraulic oil tank and cylindrical hydraulic oil tank; according to whether the liquid level of the hydraulic oil tank is open to the atmosphere. Can be divided into closed hydraulic oil tank and open hydraulic oil tank.
The closed hydraulic oil tank is completely isolated from the atmosphere. The hydraulic oil tank is completely sealed, and an airbag or spring piston is arranged in it to pressurize the oil in the hydraulic oil tank. The characteristic of the closed liquid claw tank is that the hydraulic pump has good oil suction conditions, but the drain and return pipes of the hydraulic transmission system have to withstand back pressure. They are commonly used in the hydraulic transmission system of aircraft or high altitude areas or underwater operation machinery.
Separated hydraulic oil tank is mainly composed of tank body, tank cover, oil suction pipe, air filter, oil return pipe, liquid level gauge, partition and partition, filter, etc. The baffle and the baffle in the fuel tank are mainly used to prevent precipitated pollutants from entering the oil suction pipe, the oil drain valve is used to discharge the precipitated pollutants, and the air filter has both the function of ventilation and refueling.
Integral hydraulic oil tank uses the cavity of the main engine as a hydraulic oil tank. It is characterized by compact structure and easy recovery of leaking oil, but it adds complicated parts of the main engine, which is inconvenient to maintain and has poor heat dissipation conditions. The separate hydraulic oil tank is set separately and separated from the main machine, so it is flexible in layout and convenient to maintain, reducing the influence of the heating and vibration of the hydraulic oil tank on the working accuracy of the main machine. Therefore, it has been widely used and is commonly used in walking machinery and fixed operating machinery. System.