Planar connecting rod mechanism demonstration device

Abstract

The invention relates to a planar connecting rod mechanism demonstration device, a hinge four-rod mechanism comprises a rack, a first side link, a first connecting rod and a second side link, the rackis fixed on a support frame, and the rack comprises a first transverse rod and a second transverse rod which are arranged in parallel; the first connecting rod is connected with the first side link and the second side link through revolute pairs, the second side link is connected with the second transverse rod through revolute pairs, and a first adjusting piece is arranged on the first side linkand used for adjusting the connecting position of the first side link and the first connecting rod in the axial direction of the first side link; a second adjusting piece is arranged on the first connecting rod and used for adjusting the connecting position of the first connecting rod and the second side link in the axial direction of the first connecting rod; a third adjusting piece is arranged on the second transverse rod and used for adjusting the connecting position of the second side link and the second transverse rod; and a driving mechanism is used for driving the first side link to rotate. Based on the device, the working principles and basic structures of various planar connecting rod mechanisms can be demonstrated.

Description

technical field [0001] The invention belongs to the technical field of teaching aids, and in particular relates to a demonstration device for a planar linkage mechanism. Background technique [0002] The planar four-bar mechanism is a widely used mechanism. It plays an important role in the course of mechanical principles. Help students understand and master the characteristics of the four-bar mechanism. At present, teachers usually use simulation animations in combination with PPT and four-bar mechanism teaching model display cabinets to demonstrate. Due to the bulky and large size of the display cabinets, they are usually placed in the laboratory and separated from the classroom, which greatly reduces the teaching effect; and now Some teaching aids cannot effectively show the quick-return characteristics of the mechanism, so that students' understanding of the concept can only stay in the reasoning and analysis of the formula. The size remains the same, and each form of ...

AI Technical Summary

Problems solved by technology

At present, teachers usually use simulation animations in combination with PPT and four-bar mechanism teaching model display cabinets to demonstrate. Due to the bulky and large size of the display cabinets, they are usually placed in the laboratory and separated from the classroom, which greatly reduces the teaching effect; and now Some teaching aids cannot effectively show the quick-return characteristics of the mechanism, so that students' understanding of the concept can only stay in the reasoning and analysis of the formula. The size remains the same, and each form of four-bar mechanism requires a teaching model to display, which is large in number, bulky, and inconvenient to carry; the conventional four-bar mechanism test bench generally adopts the replacement of connecting rods to adapt to different lengths of rods. Experimental requirements, this kind of experimental bench needs to prepare a large number of connecting rods for replacement, and the rods need to be disassembled and assembled continuously during the experimental process, the experimental operation is inconvenient and time-consuming

[0003] With the development of education, all kinds of professional teaching aids are more and more favored by teachers and students. They need to achieve intuitive teaching, enrich classroom content, and broaden students' thinking. Many of the current mechanical principle teaching aids cannot meet the requirements. The intuitive demonstration of various mechanisms cannot realize the comparison of the motion characteristics of different mechanisms. In many cases, only a single fixed structure teaching aid demonstration cannot be distinguished and compared. At the same time, the four-bar mechanism test bench and teaching showcase on the market are single and expensive.

In order to overcome the shortcomings of the traditional four-bar mechanism teaching showcase, such as rigid display effect, inconvenient portability, numerous models, and inconvenient disassembly and assembly of rod parts, it is necessary to design and develop a convenient and practical planar linkage mechanism experimental device.

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