How does the aircraft refuel? How does the airport transport aviation gasoline? Referring to these issues, one must mention the special transport vehicle for airport refueling - aircraft refuelling vehicles. Before we learn about aircraft refueling vehicles, let's understand how much oil an aircraft can add and how much oil an airport needs.
How much more oil is needed for a single aircraft? Xiao Bian has checked it because the size of the fuel tank is different. The amount of fuel is not the same. We often hear that the Boeing 747 is a large aircraft with a full tank of 210,000 litres of oil. This is the Airbus A320. Approximately 90,000 liters of oil are for medium-sized aircraft. The data is probably the same. We use the Boeing 747 as an example. A ton of oil is equal to about 1,355 liters of gasoline, so if you count a Boeing aircraft, you need 154 tons of oil. It can be said that if you don’t know it or not, it’s a shock. So how did this aircraft refuel?
Below the main apron of the large airport, there are pipelines for oil delivery. The pipelines connect the oil depots and the apron. When the aircraft is refueled, it is sufficient to have a pump truck to pump the oil to the tank of the aircraft. However, not every airport in the country will stop at the Boeing family of planes. It will not be necessary to add so much oil, so many small airports will not be equipped with fuel lines. If you do not have a fuel line, you must use a refuelling vehicle to refuel the aircraft. There are also special circumstances, such as the refueling pipeline for maintenance, the airport will use refueling vehicles to refuel the aircraft.
In small airports we can often see many refuelling vehicles. The most common one is the Dongfeng aircraft refueling vehicle. When the aircraft refuels, the staff will connect the refueling pipe to the refueling port on the wing side to refuel by operating the refueling panel. Like the Dongfeng aircraft refueling truck comes with a fuel pump, you can directly add oil to the aircraft tank. The vehicle is equipped with a 1.8-ton front axle, a 3.5-ton rear axle, direction assistance, air brakes, no break brake, clutch assistance, ABS, front loading, speed limit, 7.00R16 wire tyres. This refuelling car configuration should be quite high.
However, the speed of aircraft refueling vehicles in the airport is not flattering, ah, really slow, it should be the airport to do special requirements to avoid any unexpected circumstances, such as the Shanghai Pudong International Airport, there have been things like refueling vehicles.
Cross Roller Bearing is a special type bearing. Because of the inner ring or outer ring were separated, after loading the roller and the cage, it is fixed with the cross roller shaft ring to prevent the separation, so the operation is simple when installing the cross roller shaft ring. Since the rollers are intersected, only one set of cross roller bearings can withstand the load in each direction, which is three to four times more rigid than the traditional model. At the same time, because the inner ring or outer ring of the cross Roller Bearing is a two-part structure, the bearing clearance can be adjusted, and even if it is preloaded, it can obtain a high-precision rotary motion. Moreover, because of its special structure, it is commonly used in industrial robots as joint bearings.
The classification and model series of cross roller bearings are below:
RB type (outer ring segment)
RB series models for cross roller bearing, basic, inner and outer ring size is minimal to miniaturization, its structure is the outer ring is divided, the inner ring design is an organic whole, the inner ring spinning of high precision parts suitable for requirements.
RE type (inner ring segment)
The RE series is a new type of XRB design concept, which is the same size as the XRB type.The structure of the inner ring is the split type and the outer ring is one design, which is suitable for the parts with high rotating precision of outer ring.
RU type (inner and outer circle)
The RU series model is not required to be fixed flange and support base due to the processing of mounting holes.In addition, due to the adoption of the integrated inner and outer ring structure of the belt, the installation has little effect on the performance, thus achieving stable rotation precision and torque.Can be used for outer ring and inner ring rotation.
RBC type (outer ring segment)
The RBC series model (corresponding to the CRBC series of IKO company) is composed of the outer ring is the split type, the inner ring is one design, and the belt is fully loaded with roller bearings.Suitable for high rotation accuracy of inner ring.
CRBH type (inner and outer ring)
CRBH series model, outer ring and outer ring are integral structure, used for outer ring and inner ring rotation.
RA type (outer circle segmentation, ultrathin type)
The RA series model is the compact type that reduces the thickness of RB and outer ring to the limit.Suitable for areas with light weight and compact design, such as rotating parts of robot and manipulator.
SX type (outer ring segment)
The structure of SX series is similar to that of RB series. The outer ring is a two-part structure, which is designed with three spring card rings and the inner ring, which is suitable for the place where the inner ring has high rotation precision.
XRU08 type (inside and outside)
XSU08 series is similar to the RU series, and the inner and outer rings have been machined with holes, so no fixed flange and support seats are required.Due to the adoption of the integrated inner and outer ring structure, the installation has little effect on the performance, thus achieving stable rotation precision and torque.Can be used for outer ring and inner ring rotation.
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Cross Roller Bearing
Cross Roller Bearing,Excavator Parts Cross Roller Bearings,High Precision Cross Roller Bearing,Thin Section Cross Roller Slewing Bearing
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