一种学生用定位凳

该发明要解决的技术问题是在教学中使用的板凳,在进行移动位置时,很容易产生噪音,影响了教学和学习的效率。当板凳使用时,通过按下开关按钮,伸缩杆伸长,吸盘从凳腿套管内伸出,高于凳腿套管;同时人在板凳上有压力,吸盘内气体被挤出通过通气管送达气囊形成真空环境,采用保险环达到预防漏气的效果,从而吸附地板并达到定位的效果,当板凳不被使用时,气囊内气体由于压强过大通过通气管送达吸盘,吸盘吸入空气离开地板。

Comparison Between Two Solutions Based on the Relationship of Load-deflection Character of a Large Deflection Rubber Circular Plate

The rubber circular plate is considered as a kind of membrane. Based on the character that there exists no bending moment inside a membrane, the geometric behavior of the rubber circular plate in expanding state was described with the aid of a group of mathematic method. The relationship between deflection and load was attained by means of calculating stress and strain inside the curved surface of rubber plate. Meantime, based on Hencky method, the relationship between deflection and load was attained and considered as the Hencky solution. The different results given rise by the two different resolving methods were compared. The deviation results from the Hencky method was discussed, and a kind of correcting method was put forward.