The power assisted robotic arm is an automatic mechanical device that has been widely used in the field of robotics. It can be found in industrial manufacturing, medicine, entertainment services, military, semiconductor manufacturing, and space exploration. Although they have different shapes, they all have a common feature, which is that they can accept instructions and operate at a certain point in three-dimensional (or two-dimensional) space. So what are the design requirements for such a high demand power assisted robotic arm? Below, the editor will introduce to you:
1、 The power assisted robotic arm should have a large load-bearing capacity, good stiffness, and light weight
The rigidity of the power assisted robotic arm directly affects its stability, speed, and positioning accuracy when grasping the workpiece. If the stiffness is poor, it will cause bending deformation in the vertical plane and lateral torsional deformation in the horizontal plane of the power assisted robotic arm. The power assisted robotic arm will vibrate, or the workpiece will be stuck and unable to work during movement. For this reason, the arm generally uses rigid guide rods to increase the stiffness of the arm, and the stiffness of each support and connection also requires certain requirements to ensure that it can withstand the required driving force.
2、 The motion speed of the power assisted robotic arm should be appropriate and the inertia should be small
The movement speed of a robotic arm is generally determined based on the production rhythm of the product, but it is not advisable to blindly pursue high speed. The power assisted robotic arm starts when it reaches normal motion speed from a stationary state and stops when it stops at normal speed. The variable speed process is a speed characteristic curve. The weight of the assist robotic arm is very light, making starting and stopping very smooth.
3、 The action of the assist robotic arm should be flexible
The structure of the power assisted robotic arm should be compact and compact, so that the movement of the power assisted robotic arm can be light and flexible. Adding rolling bearings or using ball guides on the boom can also make the boom move quickly and smoothly. In addition, for cantilever manipulators, consideration should also be given to the arrangement of the components on the arm, that is, calculating the offset torque of the weight of the moving parts on the rotation, lifting, and support centers. Unbalanced torque is not conducive to assisting the movement of the robotic arm. Excessive unbalanced torque can cause vibration of the power assisted robotic arm, causing sinking during lifting, and also affecting the flexibility of movement. In severe cases, the assist robotic arm and column may get stuck. Therefore, when designing a power assisted robotic arm, try to make the center of gravity of the arm pass through the center of rotation or as close to the center of rotation as possible to reduce the deflection torque. For a robotic arm that operates simultaneously with both arms, the layout of the arms should be as symmetrical as possible with the center to achieve balance.
4、 The action of the assist robotic arm should be flexible
The structure of the power assisted robotic arm should be compact and compact, so that the movement of the power assisted robotic arm can be light and flexible. Adding rolling bearings or using ball guides on the boom can also make the boom move quickly and smoothly. In addition, for cantilever manipulators, consideration should also be given to the arrangement of the components on the arm, that is, calculating the offset torque of the weight of the moving parts on the rotation, lifting, and support centers. Unbalanced torque is not conducive to assisting the movement of the robotic arm. Excessive unbalanced torque can cause vibration of the power assisted robotic arm, causing sinking during lifting, and also affecting the flexibility of movement. In severe cases, the assist robotic arm and column may get stuck. Therefore, when designing a power assisted robotic arm, try to make the center of gravity of the arm pass through the center of rotation or as close to the center of rotation as possible to reduce the deflection torque. For a robotic arm that operates simultaneously with both arms, the layout of the arms should be as symmetrical as possible with the center to achieve balance.
Post time: Apr-26-2023