Characteristics and composition of electric and manual translation stations

- May 07, 2020-

The translation stage is a one-dimensional nano positioning stage with a large stroke. The mechanism adopts a magnifying structure, and the high-precision piezoelectric ceramic is used as the internal drive.

Positioning and supporting transmission are connected by flexure hinge to realize one-dimensional micro nano movement of worktable, with X-axis travel of 200 μ m and Z-direction travel of 100 μ m. This series of micro motion table can be combined into two-dimensional and three-dimensional micro motion table products, and can also be combined with different models and series of micro motion tables into two-dimensional, three-dimensional, four-dimensional, five-dimensional micro motion table products

Translation platform mainly includes electric translation platform and manual translation platform

The application and composition of the translation table: because of its high precision, strong controllability, high practicability and simple maintenance, the translation table is widely used in scientific research, laser application, automatic measurement and testing equipment, industrial automation and other fields; as well as the realization of translation control in vacuum, pollution, sterility, radiation and other environments

Full name of electronic control translation table: the electronic control translation system is basically composed of three parts: translation table (mechanical part), driving motor (driving part), controller (control part). The driving motor and controller mainly determine driving torque, resolution, acceleration and deceleration, signal processing, use functions (such as scanning, arc interpolation) and other performance parameters. The translation table is the heart of the system, The main technical indexes such as translation accuracy, stroke, load, stability, applicable environment and overall dimension are determined by them

Compared with the electric translation table, the manual translation table mainly changes the driving part to the handwheel, and removes the control part, and directly uses the hand to control the manual translation. Because of its simple driving and flexible use, the manual translation table is also widely used in various occasions requiring precise translation without online automatic control

Several main technical indexes of precision translation table are introduced:

◆ resolution: refers to the minimum position increment that can be resolved by the mobile system;

◆ accuracy: for a given input, the maximum difference between the actual position and the ideal position;

◆ repeated positioning accuracy: refers to the ability of the translation system to reach an existing fixed point multiple times;

◆ load capacity: refers to the amount of the resultant force that is allowed to act on the center of the platform and perpendicular to the direction of motion and the platform

What are the characteristics of the electric translation platform?

1. The electric translation table can convert the rotation motion of the motor into linear motion quantitatively, and its energy conversion efficiency can reach up to 70% (ball screw). This index directly improves the load capacity of the electric translation table

2. The motion accuracy of the electric translation table is high. The positioning accuracy and repeated positioning accuracy can reach micron level. For example, if the driving motor is a stepping motor, The step angle of the motor is 1.8 °. The pitch of the driving lead screw is 4mm. When the motor rotates for a circle, the linear translation reflected by 200 steps on the translation table is 4mm. Then the linear translation of the motor is 4 / 200 = 0.02mm for each step. In addition, the driver of the step motor has the function of pulse subdivision Every action of the motor can be subdivided. If 8 subdivision is adopted, then every action of the motor and the linear translation of the electric moving platform can reach submicron level theoretically

3. The high-speed movement can be realized by changing different motion conversion forms. In many applications, it is necessary to improve the movement speed of the translation table. In such cases, the electric movement table usually appears in such forms. The drive is high-speed servo motor, the drive is large pitch lead screw, or tooth tooth bar drive, tooth belt, etc. in this way, the movement speed is improved without sacrificing the accuracy and stability

4. When the electric translation table is used in combination, the tools installed on it can reach any point on the three-dimensional space. Through the linear interpolation control, the complex motion track can be realized

The cross slide composed of two electric translation tables is widely used in machine tools. When the workpiece is fixed on it, the interpolation motion can be realized by controlling the motor. It can make the plane motion track of the workpiece become complex and changeable. In addition, it can make the workpiece reach any point on the two-dimensional space

In the same way, if the three-dimensional combination of the electric rotary table is used, one of the translation tables is installed vertically, and the fixed workpiece or tool is installed on the movable table, the complex three-dimensional space trace of the workpiece and tool can be realized, and the workpiece or tool can reach any point on the three-dimensional space.