Loader Hydraulic Components & Pressure Monitoring Overview

First, the loader hydraulic components
1 Power Components
Loader hydraulic power units mainly. Pump is to provide pressurized hydraulic fluid to a hydraulic component is a pump, it is steel roller conveyor relying on sealed volume variation principle to

work, it is generally referred to as displacement hydraulic pump. It is the function of the power machine (such as electric motors and

An internal combustion engine, etc.) of the mechanical flexible conveyor energy is converted into a liquid pressure energy. Pump has the following features: having a plurality of sealing a space

and because changes can periodically; absolute pressure of the liquid in the tank must always be equal to or greater than atmospheric pressure; has a corresponding assignment

mechanism.
(2) the control element
Control element is mainly speed control valve, steering servo valve, steering flow control valve, the working hydraulic system control valve and the part of the relief valve,

safety valve and so on.
Relief valve, the pressure relief valve should be according to the liquid movement, and to control the pressure of the liquid, the main performance parameter is the control

pressure. In addition to steering loader relief valve is a pilot operated relief valve, the rest are direct-acting relief valve and safety valve type, adjust the valves are hand

wheel or adjusting screw

Mother.
Directional control valve has a boom cylinder valve and the bucket cylinder valve, used to control the transfer bucket and boom cylinder direction of movement of the hydraulic

cylinder, the bucket and boom can be parked in a position and can control the valve opening degree of the hydraulic cylinder to obtain different speeds. The bucket

Hydraulic cylinder valve is three six-way spool valve, it can control the bucket forward, backward, and in a fixed position in three movements, the boom cylinder is four six-way

valve spool valve, it can control boom rising, falling, fixed and floating four movements. Boom float position allows the load

Machine on flat stacking operation, with the situation on the ground working device can float freely.
Buffer fill valve (double acting valve) is overload valve and non-return valves, mounted in parallel with the bucket hydraulic cylinder back on the road, and its role consists

of three:
When the bucket hydraulic cylinder slide valve in the neutral position, the bucket cylinder chambers were closed after death, such as buckets subject to additional impact load,

causing a sudden rise in local oil pressure will result between the valve and the hydraulic cylinder components , pipeline damage. Set the overload valve that is able to buffer

the hydraulic overload.
The boom lifting process, so that the bucket cylinder automatic drain and fill oil. Loader linkage stopper is provided, when the boom in the lift to a certain position, the

linkage may occur interference phenomenon.
Loader unloading, to achieve rapid weight bucket by the next turn. And homeopathic hit the stopper so that the remaining material hopper unloading the net. When unloading, the

pressure oil into the front chamber of the bucket cylinder to achieve the bucket. The center of gravity over the bucket when the bucket dumplings point, the bucket under the

action of gravity acceleration flipped. But

Fuel pump speed is the speed limit, because the buffer fill oil Yan in the one-way valve in a timely manner prior to the transfer bucket cylinder chamber up the oil, the bucket

can quickly scroll down, hit the stopper, the realization hit the bucket discharge. In order to improve operational efficiency loader, the system uses a double pump confluence,

diversion,

Steering priority unloading system. When the steering, the steering pump to work the system to provide extra oil. Not steering, steering pump fluid through the confluence of all

the one-way valve into the working device system. When working device system pressure reaches the unloading valve set pressure adjustment, steering pump to work wear

Set the oil back into the tank through the unloading valve, allowing hydraulic mechanical transmission provides greater Digging force. Rational use of the engine power, improve

the overall operational efficiency.
3 actuators
Mainly refers to the hydraulic cylinder. The main function of the hydraulic cylinder parameters of its action function and pressure resistance, as the working medium fluid

through the sealed volume changes to transmit motion, by means of the internal pressure fluid to transmit power.
Second, the loader pressure monitoring
To ensure the loader hydraulic system's overall performance and technical indicators on hydraulic components for testing and adjustment, the hydraulic system as a whole should

also be detailed and thorough testing, in order to achieve proper coordination of each component work to ensure the stability of hydraulic system reliable.
Hydraulic system as a whole, including load testing and debugging debugging and load debugging. In the specific testing prior to a comprehensive inspection to be debugged loader

hydraulic system installed correctly, correct and reliable hydraulic lines, hydraulic oil grade is correct, whether compliance cleanliness requirements,

Oil inside the tank height meets the requirements, identify and correct before proceeding to the overall debugging.
A no-load monitoring and debugging
The purpose is to check the no-load debugging of hydraulic components in the system is working properly and the parameters of the various hydraulic components in the system to

adjust to the technical requirements, the machine stable and reliable performance.
When debugging, start the pump first load to rated speed operation, check the hydraulic system if there is abnormal sound transmission, while observing the instrument panel

indicates the number of oil pressure and oil temperature is normal, everything is normal, then the following operation.
Determine the hydraulic pump is working properly, then followed by manipulating the joystick, so that all elements are performed under no-load operation, speed from slow to

fast, the trip should be gradually increased until full speed run to exclude the air present in the system. Then, in no-load conditions, so that the implementation of the

components in the positive

Under normal operating procedures no-load operation. Check the correctness of each action and coordination, inspection of the action to start, stop, speed, smoothness of

transitions, check malfunction and "crawl", the impact of the phenomenon. Average load running 1-2h, and then check the oil pressure, oil temperature,

Leakage and so meet the requirements.
Although the components carried out during commissioning and testing of various parameters to adjust, no-load debugging process, but also a reasonable adjustment system pressure

value of each component regulator to ensure that the entire system is working properly and stable. Because the system pressure is adjusted improperly can cause both hydraulic

energy

Loss, so that the temperature rise would affect movement coordination, a run-up to the mechanical failure. Adjust the pressure value according to the actual use of technical

provisions or conditions of use, while actual use of the specific structure of various types of hydraulic components, the quantity and the circumstances of the specific sub-

pipeline

Analysis to determine the pressure range.
2 Load monitoring and debugging
Load debugging purposes is to check the hydraulic system after the load to bear, is able to achieve the intended work requirements, such as speed load characteristics, leakage

is serious, whether design or operational capacity maintenance requirements, the hydraulic system oil temperature is within the allowable range, etc. .
Load commissioning should be in a variety of possible conditions to test its ability to adapt to various working conditions. Entire commissioning process must be based from

simple to complex, from a single action to the principle of compound action, and test all work equipment movements. During the test, the pressure and flow

Volume, temperature, noise, leakage, etc. for the entire monitor, identify problems and timely recorded. A serious problem occurs, they should immediately be shut down for

inspection and exclusion.
Debugging process applications for performance parameter values ​​are not accurate, according to their works to the relevant adjustment device to adjust, so that the whole process

of debugging the various performance parameters gradually become normal, adjustment is ineffective when the analysis should be checked to find out reason, the components of the

repair or

Replacement.