Introduction to Type of robot arm
The robot arm is the most widely used automated mechanical device in the field of robot technology.It can be seen in industrial manufacturing,medical treatment,entertainment services,military,semiconductor manufacturing,space exploration and other fields.Although their forms are different,they all have a common feature,that is,they can accept instructions and accurately locate a point in three-dimensional(or two-dimensional)space for operation.
Introduction to mechanical arm types:
1.Hydraulic transmission manipulator
This kind of mechanical arm drives the actuator to move by compressing the pressure of liquid.The hydraulic transmission device on the mechanical arm is a kind of energy conversion device,which transfers power depending on the change of sealing volume and the pressure inside the oil.The input drive element of the hydraulic transmission manipulator is a hydraulic pump with two delivery directions,and the input drive motion is introduced to the drive shaft of the hydraulic pump as a rotary motion.
The main characteristics of the hydraulic transmission manipulator are:it usually has a large lifting capacity,stable transmission,quick movement,compact structure and good explosion-proof performance,but it has high requirements for the manufacturing accuracy and sealing performance of the sealing device,otherwise the oil leakage will have a great impact on the working performance of the manipulator,and the change of oil temperature will also affect the working performance of the manipulator,Therefore,it is not suitable for working in high or low temperature environment.
2.Pneumatic manipulator
The mechanical arm converts the pressure energy of compressed gas into mechanical energy to drive the actuator to move.The pneumatic actuator is generally composed of air cylinder,air valve and motor.In fact,the principle of pneumatic manipulator is basically the same as that of hydraulic manipulator.The difference is that the pressure energy of compressed air is converted into mechanical energy instead of liquid.
The main characteristics of pneumatic transmission manipulator:convenient air source,simple structure,low cost and quick action,but it is difficult to control the speed.The air source pressure is low,so the lifting capacity is low.Under the same lifting conditions,its structure is larger than the hydraulic transmission manipulator,so it is suitable for working in high-speed,high temperature,light load and dusty environments.
3.Electric drive manipulator
Electric drive manipulator is a kind of mechanical arm that is used more frequently at present.The displacement or angular rotation of the mechanical arm is controlled by the motor.The coordinated control of each joint motor is more important in the motion control of the electrical drive mechanical arm.In the electric drive robot arm,the common drive motors generally include servo motor,DC motor,AC motor and stepping motor.Among them,DC motor is the main drive motor at present because of its fast response,good reliability and accurate rotation angle.
The main features of the electric drive manipulator are:convenient power supply,fast response,large driving force,convenient processing,and a variety of flexible control schemes can be used,which can be applied to industrial assembly,machinery manufacturing and other fields.
4.Mechanical transmission manipulator
The power of mechanical transmission manipulator is transmitted by working machinery,and its mechanical transmission mechanism includes cam,connecting rod,gear and rack.Mechanical transmission manipulator is only used for fixed occasions,and generally uses cam or linkage to achieve the specified movement.
The main characteristics of mechanical transmission manipulator:accurate and reliable movement,high speed of action,low cost,but large structure,difficult to adjust,and often used for feeding and blanking of the working host.
