What do you mean by single-section and double-section manipulators?

The difference between a single manipulator and a double manipulator lies in the upper arm and the lower arm. If the up-and-down stroke of a single manipulator is 900, its height is 900, while the double manipulator uses the principle of double-speed structure of belt to make the stroke of the upper and lower arms of the manipulator unchanged at 900, and the height can be reduced to 450. The advantages of two-section manipulator are as follows: firstly, it runs faster up and down, and is suitable for installation in lower workshops.