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Chapter 3 Hydraulic Actuator Mind Map
This is a mind map about Chapter 3 of hydraulic actuators, including the main performance parameters and characteristics of hydraulic motors and hydraulic cylinders. Hope this helps!
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Chapter 3 Hydraulic Actuator 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
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- Outline
Hydraulic actuator
hydraulic motor
An energy conversion device that converts the pressure energy of liquid into mechanical energy of continuous rotational motion
High speed hydraulic motor
Basic forms: gear type, vane type, axial piston type
Main features: high speed, small moment of inertia, easy starting and braking, high adjustment sensitivity, low output torque
Low speed hydraulic motor
Basic form: radial plunger type
Main features: large displacement, large volume, low speed, large output torque
Vane hydraulic motor
Advantages: small size, small moment of inertia, sensitive action, suitable for high commutation frequency
Disadvantages: Large leakage, poor low-speed stability, often used in high-speed and low-torque applications
Main parameters performance
Working pressure: the actual pressure of the oil input into the motor, the size is determined by the motor load
Motor pressure difference: the difference between input pressure and outlet pressure
Rated pressure: the highest pressure for the motor to operate continuously and normally. If it exceeds this value, it is overloaded.
Displacement: The volume of oil required for one revolution of the motor output shaft when there is no internal or external leakage.
Theoretical flow rate: The flow rate of oil input when the motor reaches the required speed when there is no leakage.
Actual flow: Enter the actual flow of the motor
Volumetric efficiency
Rotating speed
Torque
Without considering the loss of the motor, its output power is equal to the input power
Theoretical torque
actual torque
Mechanical efficiency
total efficiency
Hydraulic cylinder
Used to realize linear reciprocating motion of the mechanism, and can also realize swing
The input quantities are the flow and pressure of the liquid, and the output quantities are the speed and force
Its function is to convert hydraulic energy into mechanical energy
Piston hydraulic cylinder
Double rod piston cylinder
Installation form
cylinder fixed
Piston rod fixed
The diameters of the piston rods at both ends are equal: used to require the same reciprocating speed
Single rod piston cylinder
Rodless cavity oil inlet
Oil inlet into rod cavity
Reciprocating speed ratio: When the diameter of the piston rod is smaller, the speed ratio is closer to 1, and the speed difference of the piston in the two directions is smaller; if the piston rod is thicker, the speed difference of the piston in the two directions is smaller. Larger
Differential hydraulic cylinder
When differentially connected, the worktable moves quickly and is widely used in the rapid movement of the hydraulic power slide of combined machine tools.
plunger hydraulic cylinder
The plunger hydraulic cylinder is single-acting, and its return stroke needs to be completed with the help of its own weight or other external forces such as springs.
If you want to obtain two-way motion, two-piston hydraulic cylinders can be used in pairs. In order to reduce the weight of the plunger, a hollow plunger is sometimes made.
Swing cylinder
single blade type
Output torque
Angular velocity
Double blade type
Compact structure, large output torque, but difficult to seal, generally only suitable for medium and low pressure systems
Booster cylinder
Type
single acting
double action
Used in certain hydraulic systems that require high-pressure liquid for a short period of time or locally.
Pressure ratio: represents the pressurization capacity
telescopic cylinder
It is composed of two or more piston hydraulic cylinders. The piston of the previous stage piston cylinder is the cylinder barrel of the subsequent stage piston steel.
Features: The extended stroke of the piston rod is long, and the structural size after contraction is small.
Gear cylinder: It consists of two plunger cylinders and a set of rack transmission devices. The gear drives the working parts to perform periodic reciprocating rotation.
composition
Connection between cylinder barrel and cylinder head
Flange connection
half ring connection
Threaded connection
Piston and piston rod connection
Threaded connection
snap ring connection
Sealing device: To prevent oil leakage, dynamic seals at the piston and piston rod and static seals at the cylinder head
Buffer device: seals part of the oil at the end of the stroke, forcing it to squeeze out from small holes or slits, generating oil return resistance, braking the working parts, gradually slowing down the movement speed, and preventing the piston and cylinder head from colliding with each other.
Interstitial buffer device
Adjustable orifice buffer device
Orifice changing buffer device
Exhaust device: For hydraulic cylinders with high speed stability requirements, special exhaust devices, such as exhaust plugs and exhaust valves, are often installed at the highest point of the hydraulic cylinder.