11 basic knowledge of the maintenance instructions of the excavator
1 is the slewing bearing and the central rotary joint a thing? How can the rotary motor do not turn on the body when the car rotates?
2, there is a noun called "flange component" in the book. What is this?
3 distribution valve and multi-channel valve is not a thing? What does the control valve do? What does the retaining valve do?
4 Where is the electromagnetic proportional valve located? It seems to be related to the pilot pipeline. What is the working principle?
The principle of 5 accumulator?
6 P1-P2- pump - hydraulic pump and pilot pump principle?
7 Why is there no flywheel on the excavator? What is the use of flywheels?
8 is the relief valve in the cylinder? Is the hydraulic oil returned to the hydraulic tank directly?
In which working device is the 9 pilot circuit controlled high-pressure oil circuit controlled?
10 is the oil-water separator not used to separate the oil and water from the air? Why is there a diesel pipe?
11 why is there a filter for the hydraulic oil of diesel oil?
The 11 basic questions of the excavator maintenance Note answer:
1 revolving support is a mechanical connection to the upper and lower body of a thing, the central rotary joint used to connect the upper and lower body of a hydraulic oil road component, you think, the car can be 360 degrees of turn, it is impossible to use the tubing to connect the upper and lower oil roads, so it is used in the central rotary joint. Rotary motor actually you can imagine The relationship between the helicopter propeller and the fuselage, the friction between the body and the ground, of course, can not be turned. If the machine is lifted, it will rotate.
The 2 flange is a part that connects the pipe and the pipe, and is connected to the pipe end. There are holes on the flange, and the bolts make the two flanges tightly connected.
3 control valve should be called the main control valve, the main function is to control which valve is played by hydraulic oil, controlled by the operating lever and foot board in the cab. The retaining valve should be called the bleaching valve. The function is to prevent the drop of the machine's size arm when it is flameout or without falling operation.
The 4 electromagnetic proportional valve is to control the opening and closing size of the pilot oil throttle, which is realized directly by the joystick. The displacement of the joystick controls the current size, thus commands the electromagnetic switch to control the size of the pilot throttle.
The 5 accumulator is very simple, the function is that in a small period of time after the engine stops, the manipulator can still put the machine into a safe posture, such as the engine is not flameout in the working state and can not start, when the arm is suspended in the air, it is bound to be hidden, and the storage pressure of the accumulator can be operated at this time. Under the operation of the personnel, open the arm oil way and let the big arm fall to a safe posture.
The 6 engine gives the power to the hydraulic pump, P1P2 is the right and left pump of the hydraulic pump, the left pump provides hydraulic power for a few movements, the right pump gives power to the other movements, and sometimes the two pumps provide power to an action that requires a large power. Controller, people press it, but it has to install batteries first, the pilot pump is the battery.
The 7 flywheel is used to connect the engine and the drive shaft, which is equivalent to a power transfer switch. When the car is changing, the clutch is disconnected, then shifting, then releasing the clutch, and reconnecting the power. The excavator has no transmission. It is not necessary to use the connection and disconnection of the power transmission, so there is no fly. So there is no fly. Wheel.
8 should be at the tail of the oil cylinder. It's just a container. The oil back is basically back to the mailbox. There are some special places that don't necessarily see the work and the switch of some valves.
9 in the main valve, pilot oil controls each valve's switch to control each cylinder.
10 the separation of oil and water is, of course, the separation of oil and water. Of course, there is oil. The oil-water separator is used to purify diesel oil and prevent water from entering the engine.
11 the hydraulic system of the excavator is a very precise system. The processing of each component needs very precise processing. It is a shortcoming of the hydraulic work piece. It requires very strict. The filtration of the filtrate of the diesel oil is all the fine impurities, the units are nanometers, and the larger impurities will easily lead to friction between the components. At present, most of the engines in domestic excavators are in Japan and the United States, with the largest number of Japan, MITSUBISHI and Yanmar in Japan, and the most in Cummins in the United States. These engines have high precision and high requirements for oil, and the quality of the domestic oil can not meet the requirements of these engines at present. A filter must be added in order to avoid a failure of the engine.
