Application Scenarios of Joint Shaft Coupling
Joint shaft coupling as a key component for connecting two shafts (master and slave) to transfer motion and power, its application scenarios cover a wide range of fields such as industry, transportation, and energy, etc. Different types of couplings (e.g., rigid coupling, flexible coupling, safety coupling) are adapted to different working conditions due to differences in their characteristics. Different types of couplings (such as rigid couplings, flexible couplings, safety couplings) are adapted to different working conditions due to differences in characteristics.
First, industrial automation equipment
Servomotor and ball screw connection
In the precision drive system of automated production line, the output shaft of servomotor and ball screw are often connected by flexible couplings (e.g., diaphragm coupling, plum blossom coupling). The diaphragm coupling, with zero clearance and high rigidity, ensures that the angular displacement of the servomotor is accurately transmitted to the screw, which is suitable for the positioning requirements of ±0.001mm in semiconductor packaging equipment; the plum blossom coupling absorbs the mounting deviation of the motor and screw (radial deviation ≤0.2mm) through the urethane elastomer to minimize the vibration impact on the precision guideway, which is commonly used in the high-speed transplantation mechanism of the 3C industry.
Conveyor belt drive system
The gear motor of the conveyor belt of the assembly line is connected to the roller shaft by rigid coupling (such as keyway type rigid coupling) or universal coupling. Rigid coupling is suitable for two axes with high coaxiality of the scene (such as food packaging line short distance drive), simple structure and transmission torque; universal coupling can adapt to the installation of the conveyor belt angle deviation (maximum angle of 30 °), in the logistics sorting line of the turning drum is widely used to ensure stable transmission of power.
Second, machine tools and metalworking equipment
spindle and motor connection
CNC machine tool spindle system, the motor and spindle connection needs to take into account the high speed and high torque, drum tooth coupling and hydraulic coupling is more common. Drum tooth coupling compensates axial and radial deviation through tooth meshing (speed up to 3000r/min), which is suitable for spindle transmission of horizontal lathe; hydraulic coupling transmits power through oil, which cushions the shock load when heavy milling machine is started to avoid deformation of spindle due to instantaneous overload, and protects the tool and workpiece.
Feed system transmission
The feed axes (such as X/Y axes) of milling machines and grinding machines often use elastic pin coupling, which transmits torque through nylon pins, allowing the two axes to have small parallelism deviation (≤0.1mm/m), and also absorbing high-frequency vibration in the feed movement to enhance the surface finish of the workpiece (Ra ≤0.8μm).
Third. Traffic and Transportation Equipment
Automotive Power Transmission
Automotive gearboxes and drive axles are connected by universal couplings (cross shaft type) to adapt to changes in the relative positions of the gearbox and drive axle when the vehicle is running (such as angular offset on bumpy roads); the motors and reducers of new energy vehicles mostly use rigid spline couplings, with no The motor and reducer of new energy vehicles mostly adopt rigid spline couplings, with no elastic element design to reduce energy loss and improve range, and at the same time, meet the transmission requirements of high speed (more than 10,000r/min).
Rail transportation drive
Diaphragm couplings are used to connect traction motors and wheelset axles of subways and light railways, and their metal diaphragms can withstand axial runout (±2mm) and angular deviation (≤1°), suppress impact torque during train startup and braking, and work with the braking system to realize smooth deceleration and safeguard passenger comfort.
Energy and Heavy Machinery
Wind Turbine Generators
The main shaft of wind turbine is connected with the generator by expansion sleeve coupling or flexible coupling. Expansion sleeve coupling transmits large torque (up to 1000kN・m) through friction, and is easy to install and dismantle, which is suitable for the maintenance needs of offshore wind power; while elastic coupling absorbs torque fluctuation when the blades are rotating through the rubber elastomer, which protects the bearing of the generator and prolongs its service life.
Metallurgical equipment
Rolling mills use gear couplings to connect the motor to the rolls, and their tooth structure can compensate for the thermal expansion and contraction of the rolls at high temperatures (axial displacement up to 50mm), while transmitting huge rolling torque (up to 5000kN・m for a single mill); the crystallizer drive system of continuous casting mills uses safety couplings (e.g., shear pin couplings), and when the crystallizer gets stuck, the shear pin breaks to cut off the power. When the crystallizer is jammed, the shear pin breaks and cuts off the power, preventing the motor and reducer from being overloaded and damaged.
Five. Medical Devices and Precision Instruments
Medical Equipment Transmission
In the rotating frame drive of CT scanner, the motor and rotating shaft are connected through a bellows coupling, and its thin-walled bellows structure can realize zero return error to ensure the angular accuracy (±0.01°) during scanning; the robotic arm joints of surgical robots use micro-elastic couplings (OD ≤ 20mm), which absorbs the tiny vibration of hand operation while transmitting power and improves the control precision of surgical instruments.
Laboratory Instruments
The centrifuge uses high torque flexible coupling to connect the motor and the rotary head shaft, which ensures the concentricity of the centrifuge tube when rotating at high speed (15,000r/min) and prevents the centrifuge tube from breaking due to vibration; in the transmission system of the spectrometer, the magnetic particle coupling controls the torque by adjusting the excitation current, realizing stepless speed change of the sample stage and adapting to different wavelengths. variable speed, adapting to the detection needs of different wavelengths.
The core of coupling application is "adapting shaft system deviation and working condition characteristics": rigid couplings emphasize efficient transmission, suitable for high coaxiality and shock-free scenarios; flexible couplings focus on buffering and compensation, adapting to vibration, deviation of the transmission; safety couplings focus on the protection of the equipment as the core, cutting off the power in the event of overload. From microscopic precision instruments to macroscopic heavy machinery, couplings through the type of choice to achieve power transfer "precision matching", becoming an indispensable connection hub of the mechanical system.
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