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Chapter 5 Hydraulic Auxiliary Components Mind Map
This is a mind map about Chapter 5 of hydraulic auxiliary components, including pipelines, pipe joints, fuel tanks, filters, sealing devices, etc. Hope this helps!
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Chapter 5 Hydraulic Auxiliary Components Mind Map
- bacteria
This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
- Plant asexual reproduction
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
- Reproductive development of animals
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
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- Outline
Hydraulic auxiliary components
pipeline
To connect hydraulic components and transport hydraulic oil, oil pipes need to be selected according to the working pressure and installation location of the hydraulic system.
Pipe joint
The detachable connectors between pipe fittings and hydraulic components, and between pipe fittings and pipe fittings, should meet the requirements of easy disassembly and assembly, firm connection, reliable sealing, small liquid resistance, compact structure, and small pressure loss.
Welded pipe joints: reliable work, working pressure, up to 32MPa or higher, but the assembly workload is large and requires high welding quality, not suitable for thin-walled steel pipes
Tube joints: no need for welding, no additional seals, small size, easy to assemble and disassemble, widely used in high-pressure systems
Flared pipe joint: simple structure, good reusability, suitable for medium and low pressure systems where thin-walled pipe connections generally do not exceed 8MPa
Hose joints: Hose joints are available in detachable and crimped types. Depending on the pipe diameter, they can be used in hydraulic systems with working pressures of 4-40MPa.
Quick connector: The full name is quick assembly and disassembly pipe joint. No assembly and disassembly tools are required. It is suitable for frequent assembly and disassembly.
tank
It stores oil and also plays the role of dissipating heat in the oil, escaping gas mixed in the oil, and precipitating dirt in the oil.
Overall type: The inner cavity of the main engine is used as the oil tank. Its structure is compact and various leaked oils are easy to recover. However, the heat dissipation is poor and it is easy to cause thermal deformation of adjacent components, affecting the accuracy of mechanical equipment and making maintenance inconvenient.
Separate type: an independent device separated from the main engine. It has flexible layout and easy maintenance. It can reduce the impact of fuel tank heating and hydraulic vibration on working accuracy, and facilitates the design of generalized and serialized products.
Design considerations
The fuel tank should have sufficient rigidity and strength
The fuel tank must have sufficient effective volume
The oil suction pipe and oil return pipe should be as far apart as possible to prevent oil contamination.
Prevent oil contamination
Easy to dissipate heat and maintain
Oil temperature control in the fuel tank
The inner wall of the fuel tank needs to be processed
filter
Filter the impurities mixed in the hydraulic oil to reduce the pollution of the oil entering the hydraulic system and ensure the normal operation of the system
Surface filter: The surface of the filter element of the surface filter is in contact with the hydraulic medium. This filter material acts like a screen to retain impurity particles on its surface.
Depth filter: In a depth filter, the oil must flow through complex gaps to achieve the purpose of filtration.
Intermediate filter: The filtration method of the intermediate filter is between the above two
basic requirements
Have sufficient filtering accuracy
Have sufficient filtering capacity
The filter should have a certain mechanical strength and not be damaged by hydraulic pressure.
The filter element has good corrosion resistance and can work permanently under the specified temperature.
The filter element should be easy to clean and replace, and easy to disassemble and maintain.
Select
Select the filter model based on the requirements of the hydraulic components and system for pollution level or filtration precision, the system's working pressure, oil temperature and oil viscosity, etc.
The filter must have sufficient flow capacity and should be selected based on the installation position of the filter in the system. Flow capacity refers to the maximum flow allowed through the filter under a certain pressure drop.
The filter must have a certain mechanical strength and not be damaged by hydraulic pressure.
For hydraulic systems that cannot be shut down, a filter with a switchable structure must be selected, and the filter element can be replaced without stopping the machine.
Installation location
Installed on the suction port of the hydraulic pump
Installed on the outlet oil line of the hydraulic pump
Installed on the oil return line of the system
Installed on the branch oil line of the system
separate filtration system
Sealing means
Require
Within the working pressure and a certain temperature range, it should have good sealing performance, and can automatically improve the sealing performance as the pressure increases.
The friction between the sealing device and the moving parts should be small, and the friction coefficient should be stable
It has strong corrosion resistance, is not easy to age, has a long working life and good wear resistance, and can automatically compensate to a certain extent after wear.
It has simple structure, convenient use and maintenance, and low price.
type
gap seal
O-ring
Lip seal
Combined sealing device
Rotary shaft sealing device
Accumulator
The energy storage component in the hydraulic system stores excess pressure oil and releases it to the system when needed.
type
Gravity type
spring type
inflatable
Diaphragm type
Piston
Air bag type
Function
as auxiliary power source
Maintain pressure and make up for leaks
Alleviates shocks and absorbs pressure pulsations
Installation location: When absorbing hydraulic shock or pressure pulsation, it should be installed near the impact source or pulsation source; when replenishing oil and maintaining pressure, it should be installed as close to the corresponding actuator as possible
Installation Precautions
In principle, the air bag accumulator should be installed vertically (with the oil port facing downward), otherwise it will affect the normal use of the air bag.
The accumulator installed on the pipeline must be fixed with a support plate or bracket
A stop valve should be installed between the accumulator and the piping system for charging and maintenance.
A one-way valve should be installed between the accumulator and the hydraulic pump to prevent the pressure oil stored in the accumulator from flowing back when the hydraulic pump stops working.