CN2412262Y

CN2412262Y - Force synthesizing and decomposition demonstration instrument

Info

Publication number: CN2412262Y
Application number: CN 99257932
Authority: CN
Inventors: 王衡; 封琢; 包伟清
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-24
Filing date: 1999-12-24
Publication date: 2000-12-27
Anticipated expiration: 2009-12-24

Abstract

The utility model belongs to a force synthesis and decomposition demonstration instrument used in the physical teaching. The utility model comprises a demonstration plate, a demonstration plate frame, an ergometer, a pulley, a scale rod, and a hook weight, and the ergometer, the pulley, the scale rod, and the hook weight are respectively fixed on the demonstration plate; besides the utility model also comprises a crunode regulator fixed on the demonstration plate, a direction pulley which can move left and right on a transverse rod of the demonstration plate frame and a line tightener. The crunode regulator comprises a rubber rib of which the size can be adjusted and a steel strip hook. The utility model has the advantages of simple operation, high accuracy, bright colour of the scale rod and strong visibility. Besides, a plurality of aluminum strips can form the synthesis of the parallelogram of the force, and the effect of the synthesis of the parallelogram of the force is consistent with the diagram effect of the composition and the decomposition of forces taught in a textbook. The utility model is more favorable for students understand to the concept.

Description

Synthetic, the decomposition demonstrator of power

The utility model belongs to the general teaching aid in a kind of education or the demonstration equipment, relates to a kind of synthetic, decomposition demonstrator of power.

The demonstrator synthetic, that decompose of demonstrating power at present in physics teaching in secondary school has several as adopts has scale on a disk, around it, there is the mode of fixed pulley to demonstrate the synthetic of power and decompose, and the demonstrator of some other form is not often because the scale pupil sees Chu, add troublesome poeration, so the demonstration poor effect.

The purpose of this utility model provides a kind of easy and simple to handle random, synthetic, the decomposition demonstrator of the demonstration outstanding effect power that degree of accuracy is higher.

The utility model includes demonstration board, demonstration board support, is fixed on dynamometer, pulley, scale bar and hook sign indicating number on the demonstration board, it is characterized in that, also comprise the node regulator that is fixed on the demonstration board, can be on the demonstration board rack cross-bar direction pulley and the turnbuckle of move left and right; Described node regulator include an end be fixed in the other end on the regulator elastic of hook is arranged and be loaded on the regulator scalable, rotating steel bar hook.

Be described in further detail below in conjunction with the embodiment accompanying drawing.

Fig. 1 the utility model constitutes synoptic diagram.

Fig. 2 node controller structure synoptic diagram.

As shown in Figure 1, on demonstration board 4, dynamometer 1 usefulness bolt, nut and support plate are fixed, but dynamometer 1 can slightly rotate fixed-node regulator 2 on demonstration board 4 around its card center.The structure of node regulator 2 as shown in Figure 2, long steel bar hook 11 passes the radial direction through hole of locking cylinder 10, and by fishbolt top jail.Locking cylinder 10 usefulness bolts, nut are fixed on the node regulator 2, but can rotate around the axis of locking cylinder 10.And an elastic 13 ends 12 clampings by a transfusion water, and water ends 12 and is screwed on node regulator 2.A direction pulley 8 is contained on the support 9 of demonstration board 4 as shown in Figure 1, and can prolong the cross bar move left and right of support 9.One fine rule, one end hangs on the dynamometer link of dynamometer 1, the other end is walked around direction pulley 8, pass again on elastic 13 hook that turnbuckle 7 hangs over node regulator 2 at last, one group of aluminum strip 3 of representing the component size, their end with the tubular rivet riveting together, can hang on the steel bar hook 11 of node regulator 2, their other end has cord, this cord is walked around the different pulleys 5 back other ends separately and is hung up the hook sign indicating number, be decorated with different colours vitta at interval on one group of above-mentioned aluminum strip 3 and other three aluminum strips 3 respectively, on the boundary line aperture arranged at interval at different vittas as unit length.Described turnbuckle 7 has cylindrical shell cylinder axis place one in shell to have the axle of radial direction through hole to be fixed on the housing of turnbuckle 7, this axle one end also fixedly is equipped with a pinion wheel, and limit this pinion wheel counter-rotating with a spring leaf, and this shaft extension goes out outside the shell, fix a gear again at the shell axially outer end, so that with hand-drive gear and axle, above-mentioned fine rule can pass in turnbuckle 7 shells in the hole on the axle by hole on the shell.

The utility model operation steps is illustrated in figure 1 as:

1, end 12 regulated at will as the length available water of " stressed object " elastic 13, the application point that the hook of elastic 13 ends is considered as component, makes a concerted effort is hereinafter to be referred as " application point of power ".

2, one group of one end riveting has the aluminum strip 3 of tubular rivet, tubular rivet is hung on " application point of power ", hang up the hook sign indicating number of the vitta number of expression power size on the corresponding aluminum strip 3 on the cord not holding of these two aluminum strips 3, and with cord around hanging on the selected pulley 5, can change the angle of component by the length of selecting different pulley 5 and elastic 13, be elongated at elastic 13 under the acting in conjunction of two component and be parked on a certain position.

3, unscrewing above the elastic 13 the fixedly bolts of steel bar hook 11, is tubular rivet with " application point of power ", and the end that moves to steel wire hook 11 is linked up with, and elastic 13 returns to the length that does not have when stressed at this moment.

4, the cord end that will link to each other with dynamometer 1, walk around direction pulley 8 and by hanging over behind the turnbuckle 7 on the hook of elastic 13 ends, the tangential direction that take turns therewith the position of adjusting direction pulley 8, the direction of fine rule is overlapped with the direction of steel bar hook 11, and the disk that rotates dynamometer 1 again makes the direction of dynamometer 1 metal rod consistent with fine rule.Clockwise direction is twisted the shell outer rotor of turnbuckle 7 then, at this moment fine rule is tightened up, elastic 13 is elongated gradually, the reading of dynamometer 1 also increases gradually, when point of resultant force is pulled to hook position, steel bar hook 11 lower ends, the reading of dynamometer 1 is the size of making a concerted effort, and the drop-down direction of fine rule is the direction of making a concerted effort.

What 5, will be fixed together with fishbolt is two weak points in three aluminum strips 3, form parallelogram on the aluminum strip 3 lower end nails of riveting by tubular rivet of selecting certain aperture to hang over to represent the component size, 3 of long aluminum strips are tightened the fishbolt of these three aluminum strips 3 after fixing along diagonal.At this moment the number that is positioned at different vittas on the aluminum strip 3 of diagonal positions is the size of making a concerted effort, and its numerical value is identical with the reading of dynamometer 1, releases or verify " parallelogram of forces " rule thus.

The utility model has the advantage of easy and simple to handlely, accuracy is higher, and several scale bars are aluminum strip 3 Represent separately the size of power with different vittas, namely hang with the number of hook code. Thereby bright and lustrous, can Strong depending on property, and several aluminum strip 3 can form the power said on the form of parallelogram of forces and the textbook Diagram effect synthetic, that decompose is consistent, is more conducive to the student to the understanding of this concept.

Claims

1, a kind of synthetic, decomposition demonstrator of power, include demonstration board, demonstration board support, be fixed on dynamometer on the demonstration board, the hook sign indicating number of pulley, scale bar, it is characterized in that, also comprise the node regulator that is fixed on the demonstration board, can be on the demonstration board rack cross-bar direction pulley and the turnbuckle of move left and right; Described node regulator include an end be fixed in the other end on the regulator elastic of hook is arranged and be loaded on the regulator scalable, rotating steel bar hook; The described dynamometer that is fixed on the demonstration board, can be on its facade left-right rotation.