The New Smart Eraser Design

The paper puts forward a kind of mechanism design scheme, the mechanism can automatically detect the blackboard chalk stains


Introduction
The traditional blackboard chalk dust is a common problem in the traditional blackboard-eraser-chalk architecture (Ren, 2002).Lots of improved blackboard eraser structure came into being, but these improvements changed the original wipe, or not fundamentally solve the problem, or too costly and difficult to spread (Hu & Wan, 2008).For this reason, the design is based on the traditional blackboard-eraser-chalk called intelligent wipe chalk system, its connotation of "smart" includes moving, positioning, wipe (Wang, Song, & Wang, 2009).The design is able to achieve automated clean the blackboard and collect dust, which has a good prospect.
Bodies base on traditional blackboard and eraser size.The mechanism consists of three motors A, B, and C, three guide rails a, b, c, three sliders 1, 2, 3 and a slider-crank mechanism.Slider 1 and slider 4 are connected by rails c, and rails c is installed on them, can be moved in parallel with the slider, power-driven provided by three motors A, B, C. Motor A drives the left and right movement of beams c, and motor B drives the vertical movement of the slider 3, C is the power source of the slider-crank mechanism which driven rotary motion slider to rub c moving up and down along the rail, together with the installation in 2 below the blackboard (Chart 1).
The process is carried out as follows: the power of beam c comes from the motor A, the rail transfers the power.Motor A forward and reverse rotation drives the beam C forward or back movement.Motor B forward and reverse rotation drives the slider 3 upward and downward movement.The method is able to reach the special position, and then eraser cleans the blackboard.Motor C is installed in block 3 internal provides power for Slider-crank mechanism, pushes the slider 2 up-and-down along the rail c.Slider 2 is a combination of the movement of a, b, c, performs wipe.When the wipe is finished, A, B motor work and C motor stop, blackboard eraser returns to the original position, waiting for the next wipe.as the mage oller.
The control system software design requires software platform with easy-to-use, modular, standardize and repeatable development features.Choosing a graphical programming language LabView make it convenient for maintenance and improvement.

Image processing
Image acquisition is a very important step in the visual collection.Because the unevenness of the CCD sensitivity and quantizing noise in photovoltaic conversion process is existent, and the reason of light.Actually, the quality of the image becomes poor, we cannot get a clear image.In order to facilitate the subsequent image analysis and understanding, it is necessary for image processing.
The purpose of image smoothing is to suppress the image noise and improve image quality.In the practical application, the image noise source is come from blackboard surface's spots and the thermal noise of the flow of electron.When the noise reaches a certain intensity, will make subsequent image processing work cannot be carried out, so the image processing smoothing is required.In order to get a better picture of the edge information, the next is image sharpening.The purpose of sharpening processing of the image is mainly used to enhance the outline of the edge in the image, details and gradation to form a complete boundary of the object, to achieve the separation of the object from the image, or indicating that the surface region of the same object is detected.The Gradient and Laplace operator due to the isotropic nature, and therefore is a commonly used (3) We can get the conclusion c c c v ,α , L : Written in the form of a matrix: According to the calculation and analysis, we get a conclusion that blackboard erase is able to run smooth, and complete the expected movement.

Summary
Compared with manually wipe, smart wipe has a good effect and runs smooth with good reaction speed.The rate of rotation of the motor can be set in accordance with the requirements of the wiping speed to suit the requirements of different occasions.
1) The smart eraser has a simple structure, easy to operate, easy to obtain raw materials, manufacturing equipment simple process.
2) Control functions, and less susceptible to interference, high reliability, ease of use, can make products with high performance and low cost.
3) The product is suitable for large, medium and small institutions, the promotion of a certain significance.

Figure 1 .
Figure 1.The acquisition system Figur