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What factors determine the flexibility of industrial robots?

Release time:2020-06-05 source:Yihua shoes Technology Research Co., Ltd

With the rapid development of the robot industry, industrial robots have been widely used in all walks of life, from material handling to machine maintenance, from welding to cutting, from assembly to spraying. We find that these industrial robots have different shapes and different functions and performances, so what determines the flexibility and range of activities of industrial robots? This problem is more complex, But there is a key factor that determines the flexibility and range of motion of the robot to a large extent, that is, the degree of freedom of the industrial robot, usually also known as the number of axes.

What is the degree of freedom of industrial robots?
Usually, as the technical index of robot, it reflects the flexibility of robot action, which can be expressed by the number of straight-line movement, swing or rotation of axis. The number of joints that a robot mechanism can move independently is called the degree of freedom of the robot mechanism, which is abbreviated by DOF. At present, the control method of industrial robots is to treat each joint of the manipulator as a separate servo mechanism, that is, each axis corresponds to a server, each server is controlled by the bus, and controlled and coordinated by the controller.

Is08373's explanation to industrial robots: "robots have automatic control, reprogrammable and multi-purpose functions. Robot operators have three or more programmable axes. In industrial automation applications, the robot base can be fixed or movable.". It can be seen that the number of axes of industrial robots is an important technical index.

Application of robots with different degrees of freedom in industry

The number of robot axes determines its degree of freedom. Is the more freedom, the better? The more freedom, the closer to the action function of human hand, the better universality; but the more freedom, the more complex structure, the higher the overall requirements of the robot, which is a contradiction in robot design. With the increase of the number of axes, the flexibility of the robot increases. However, in the current industrial applications, the most commonly used industrial robots are three-axis, four axis, five axis double arm and six axis. The choice of the number of axes usually depends on the specific application. This is because, in some applications, there is no need for high flexibility, and three-axis and four-axis robots have higher cost-effectiveness, and three-axis and four-axis robots also have great advantages in speed. If it's just for simple applications, such as picking and placing parts between conveyor belts, a four-axis robot is enough. If the robot needs to work in a narrow space, and the manipulator needs to twist and reverse, the robot with six or seven axes is the best choice.

At present, six axis robot is widely used in industry. The industrial robot with six joints is very similar to the human arm. It has the same parts as shoulder, elbow and wrist. Its "shoulder" is usually installed on a fixed base structure. The function of the human arm is to move the hand to different positions, while the function of the six axis robot is to move the end actuator. Various actuators suitable for specific application scenarios are installed at the end of the mechanical arm, such as claw, blowtorch, drill and paint sprayer, to complete different tasks.

Recently, robot manufacturers have released the latest man-machine cooperative robots, almost all of which are redundant industrial robots with seven axes. International famous robot manufacturers have launched new products of seven axis robot to seize the high-end new market. However, compared with the traditional four-axis and six axis industrial robots, the real seven axis industrial robots have a significant gap in product types and sales.

Development trend of redundant DOF robot

Six degrees of freedom is the minimum number of degrees of freedom with the ability to complete spatial positioning, which is more than six axes. It is called redundant degree of freedom robot. The research of robot kinematics aims to solve the movement or rotation of each joint when the end effector of robot manipulator reaches a certain pose in space, which is the cornerstone and key of the whole robotics. With the rapid development of human civilization, the work in many industrial, high altitude, deep sea, nuclear waste and dangerous working environment needs robot to complete, which puts forward higher requirements for the reliability, operability and intelligence of robot motion control. In the future, with the increasing of its accuracy, redundant DOF robots have more advantages in obstacle avoidance, singularity overcoming, flexibility and fault tolerance. Facing the complex working environment and changing operation requirements, redundant DOF industrial robots will have more use of weapons. It is believed that in the near future, it will replace manual operation for more precise operation.

This article comes from the network, from the shoes automatic production line automatic cutting machine Dongguan Yili Automation Technology Co., Ltd. hotline: 13662739081


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