Application of the hottest multimedia courseware i

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The application of multimedia courseware in teaching mode

blackboard writing helps students to grasp the important knowledge points in the classroom, but it can provide less information, so it can not combine the theoretical knowledge points with engineering practice well, such as what the motion sketch is and how it is in Engineering: in addition, it is difficult to interpret the knowledge difficulties vividly and effectively, such as the drawing process of mechanism motion sketch

courseware ppt can just make up for the lack of information in blackboard writing. Therefore, at the beginning of the class, you can first use PPT to provide some engineering cases related to motion diagrams, such as pictures or Flash animations of jaw crusher, crank rocker pump, stepping conveyor, shaper, water pump, etc., which are both visual and intuitive, can stimulate students' interest in learning, and inspire students how to design the above institutions by asking questions

when explaining the drawing steps of the motion diagram, you can use the flash animation of the jaw crusher shown in Figure L. From the moving pair between member 1 and member 2, it can be seen that member 1 and member 2 are in contact, so it can be judged that they are flat and low pairs, meaning that the relative motion between them is rotation. Finally, it can be judged that the moving pair is a rotating pair, and its axis is at point 0: it can also be judged that member 2 and members 3 and 4 form a rotating pair at points B and D respectively, and member 3 and frame 6 form a rotating pair at point E, Component 4 and component 5 form a rotating pair at point C, and components 1, 5 and frame 6 form a rotating pair at the point where the supply of waste plastic particles 1 in a and f exceeds the demand respectively: at the same time, it can be seen that component L is an eccentric axis. When drawing the motion diagram of the mechanism, the eccentric axis is represented by a solid line. In fact, with the development of science and technology, the length of the line is the eccentricity, and other components are rods, which are represented by solid lines, The length of the solid line is the motion size: next, the motion sketch of the mechanism can be drawn in proportion with the motion plane as the projection

students can draw a motion sketch while watching flash animation. Using flash animation, students can not only clearly see the working process of the crusher, but also provide convenience in the drawing process. Without rotating the mechanism by themselves, they can easily find out the number of movable parts of the mechanism and the moving pairs of each component

through flash animation, students can understand the drawing steps of the motion diagram, but they are still confused about whether the actual engineering object works according to the principle. At this time, they can play the gravel video of the jaw crusher as shown in Figure 3 with the help of PPT video. Through this video, students turn from animation to the physical object of the crusher, which can stimulate students' interest in learning: at the same time, they can clearly understand the real working principle of the crusher: the motor drives the belt and pulley, and the connecting rod moves up and down through the eccentric shaft, and the connecting rod finally drives the moving jaw to move up and down. When the connecting rod rises, the moving jaw plate is pushed close to the fixed jaw plate, and at the same time, the material is crushed or chopped to achieve the purpose of crushing. When the connecting rod goes down, the movable jaw plate leaves the fixed jaw plate under the action of the connecting rod and the rack connecting rod. At this time, the crushed materials are discharged from the lower opening of the crushing chamber

at present, teachers with over-current, over-voltage, overload and other protection installations at the front line of teaching reflect that they rely more on multimedia, and also broadcast the blackboard content that should highlight the key knowledge on Pt, which makes the whole teaching process too fast. Students are like watching a movie, they can't grasp the primary and secondary knowledge points well, and there is no time to digest more information. Therefore, after the class, the brain is still blank. While blackboard writing is carried out with the progress of the classroom, it is actually better than the expansion of six grades, so it has a good grasp of the rhythm and effectively highlights the important knowledge points. Therefore, the effective interleaving and combination of multimedia and blackboard writing can promote the strengths and circumvent the weaknesses and complement each other

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