Technical parameters are the direct manifestation of the gap between different industrial robots. Different characteristics of technical parameters of robots correspond to their different application areas. Industrial robots are high-precision modern mechanical equipment with many parameters. What parameters should enterprises pay attention to when selecting industrial robots?
Next, let's look at the seven technical parameters of industrial robots that deserve our attention.
1. Degree of Freedom
The degree of freedom can be explained by the number of axes of the robot. The more the number of axes of the robot, the more the degree of freedom, the more flexible the movement of the mechanical structure, and the stronger the versatility. However, with the increase of DOF, the structure of the manipulator becomes more complex, which will reduce the rigidity of the robot. When the degree of freedom on the manipulator is more than the degree of freedom needed to complete the work, the redundant degree of freedom can provide a certain obstacle avoidance ability for the robot. At present, most robots have 3 to 6 degrees of freedom, which can be selected according to the complexity and obstacles of actual work.
2. Driving mode
Driving mode mainly refers to the power source form of joint actuator. Generally, there are hydraulic drive, pneumatic drive and electrical drive. Different driving modes have their own advantages and characteristics. According to their actual work needs, they are selected. Now the more commonly used is the electric drive mode. The main advantage of hydraulic drive is that it can output larger driving force with smaller actuator, but the disadvantage is that oil is easy to leak and pollute the environment; the main advantage of pneumatic drive is that it has better cushioning effect and can realize stepless speed change, and the disadvantage is that it is noisy; the advantage of electric drive is high driving efficiency and easy to use. And the cost is low.
3. Control mode
Robot control mode is also called control axis mode, which is mainly used to control the trajectory of the robot. Generally speaking, there are two control modes: one is servo control, the other is non-servo control. Servo control methods can be subdivided into continuous trajectory control and point control. Compared with non-servo control robots, servo control robots have larger memory storage space, can store more point addresses, and can make the operation process more complex and stable.
4. Working speed
Working speed refers to the angle or distance of the center of mechanical interface or tool in a unit time when the robot moves at a uniform speed under a reasonable working load. Simply put, the higher the maximum working speed, the higher the working efficiency. However, the working speed will take more time to accelerate or decelerate, or the maximum acceleration or deceleration rate of industrial robots will be higher.
Workspace means that the origin of the coordinate system of the end effector can move in the maximum range of space when the robot operates normally, or that the point can reach the space volume occupied by all points. The size of the workspace is not only related to the size of each link, but also to the overall structure of the robot. The shape and size of the workspace is very important. Robots may not complete tasks because of the presence of deadzone that can not be reached by the hands when performing a task.
6. Working load
When the robot works within the specified performance range, the maximum load that the wrist of the robot can bear. The working load depends not only on the quality of the load, but also on the speed and acceleration of the robot. In order to ensure safety, the working load is defined as the bearing capacity of high-speed operation. Usually, the working load refers not only to the mass of the load, but also to the mass of the end effector of the robot.
7. Working accuracy, repetition accuracy and resolution
Simply speaking, the working accuracy of a robot is the error produced by locating a position each time. Repetitive accuracy is the mean of the error produced by locating a position repeatedly. Resolution is the smallest moving distance or the smallest rotating angle that each axis of the robot can achieve. These three parameters work together on the accuracy of the robot.