Performance characteristics of industrial robots
1. Degree of freedom degrees of freedom are the main indicators for measuring the level of robotics. The so-called degree of freedom refers to the independent motion of the moving part relative to the fixed coordinate system. Each degree of freedom requires a servo axis to drive, so the higher the degree of freedom, the more complex the robot can perform, the more versatile, the wider the application range, but the greater the technical difficulty. In general, general industrial robots have 3-6 degrees of freedom.
2. The working space refers to the spatial range in which the robot applies the claws to work. The wrist reference point describing the workspace can be selected at the center of the hand, at the center of the wrist, or at the fingertips of the finger. The reference point is different, and the size and shape of the workspace are different. The working space of the robot depends on the structural form of the robot and the range of motion of each joint. Work space is an important performance indicator for industrial robots and an important indicator for designing industrial robots.
3. Carrying capacity The carrying capacity refers to the maximum weight that the robot can bear in any position within the working range. The carrying capacity depends on the quality of the load, the speed and direction of the acceleration, and the direction of the industrial robot. It can be roughly divided into: 1 micro-robot - carrying capacity is below 10N; 2 small robot - carrying capacity is 10-50N; 3 medium-sized robot - carrying capacity is 50-300N; 4 large-scale robot carrying capacity is 300-500N; 5 heavy-duty robot - The carrying capacity is 500N or more.
4. The speed of motion speed affects the working efficiency and motion period of the robot. It has a close relationship with the gravity and position accuracy extracted by the robot. The moving speed is high, and the dynamic load that the robot is subjected to increases will inevitably bear a large inertia force during acceleration and deceleration, affecting the work stability and position accuracy of the robot. As far as the current state of the art is concerned, the maximum linear motion speed of general-purpose robots is mostly below 1000 mm/s, and the maximum rotational speed is generally not more than 120 °/s.
5. Positional accuracy It is another technical indicator to measure the quality of robot work. The positional accuracy of industrial robots includes positioning accuracy and repeatability. Positioning accuracy depends on the position control method and the accuracy and rigidity of the moving parts of the robot. It is also closely related to the factors such as gravity and motion speed. Repeated positioning accuracy is the accuracy of the robot's repeated positioning of a certain position. The typical industrial robot positioning accuracy is generally in the range of O.02mm~±5mm.
Technical parameters of industrial robots
1, the robot load
The load is the maximum weight that the robot can withstand while working. If you need to buy a palletizing robot, you should calculate the weight of the cargo and the weight of the robot gripper in the load. The weight of the cargo is 140 kg, and the weight of the gripper is 15 kg. For example, you can choose the robot model MPL160. The load is 160kg.
2, repeat accuracy
The choice of this parameter also depends on the application. Repeatability is the accuracy/difference of the robot to the same position after each cycle. If the robot is used to make a circuit board, you need a robot with super high repeatability. If the accuracy of the application is not high, then the repeatability of the robot can be not as high. For example, the accuracy is usually expressed in "2" in the 2D view. In fact, since the robot is not linear, it can be anywhere within the tolerance radius.
3, robot arm exhibition
When choosing a robot, you need to know the robot's wingspan, which is the maximum distance that can be reached. Choosing a robot depends not only on the load, but also on its maximum range of motion. Each company gives the range of motion of the robot, and you can see if it fits your application. The maximum vertical motion range is the range between the lowest point that the robot's wrist can reach (usually below the base of the robot) and the highest point. The maximum horizontal motion range is the distance between the farthest point that the robot wrist can reach horizontally and the center line of the robot base. You also need to refer to the maximum range of motion (in degrees). These robots with different specifications are very different and have limitations for certain applications.
4, robot weight
Robot weight is also an important parameter for designing robot units. If an industrial robot needs to be installed on a custom workbench or even a track, you need to know its weight and design the appropriate support.
If you feel that the robots on the market today are not suitable for the work you need, you can tell the robot manufacturer what needs to be designed and improved according to your actual situation until you are satisfied.
Speed is different for different user needs. It depends on when the work needs to be completed. The specification sheet usually only gives the maximum speed, and the robot can provide a speed between 0 and the maximum speed. The unit is usually degrees/second.