CN209297579U - A kind of lever balance experimental provision - Google Patents

Abstract

The utility model relates to teaching aid technical fields, more particularly to a kind of lever balance experimental provision, it is hinged on bracket at the center of the four-bladed vane, four-bladed vane two sides are hung with object and respectively via rotation adjustments, the pedestal lower end level is equipped with the meter ruler for reading, lever main body is " cross " lever, finds out the arm of force by lever itself adjusting；When measuring arm of force, by rotating scale ruler, corresponding integer graduation mark is found out, similar figures is recycled to prove out lever principle；When probing into lever principle, hook code can not had to, the object of any weight can be used to probe into.

Description

A kind of lever balance experimental provision

Technical field:

The utility model relates to teaching aid technical fields, and in particular to a kind of lever balance experimental provision.

Background technique:

Teaching demonstration is teacher in teaching, shows student to see in kind or audio-visual aids, or the reality of presenting a demonstration property It tests, perceptual knowledge is obtained to illustrate and confirm the method for taught knowledge by actual observation, teaching demonstration can be such that student obtains Lively and intuitive perceptual knowledge deepens the impression to learning object, and theoretical knowledge on books and practical things are connected, Form correct and deep concept；The ability of some images can be provided, cause the interest of study, collect the attention of middle school student Power facilitates deep understanding, memory and consolidation to knowledge；Student can be made by observation and thinking, carry out thinking activities, Development Watch power, imagination and thinking ability.The method of demonstration refers to that in teaching process, teacher uses intuitive teaching aid, and cooperation is said Award and carry out exemplary operation demonstration, make student from obtain a kind of teaching side of perceptual knowledge or proof theory knowledge Method.

In middle school physical experiment, lever balance experiment is a key points and difficulties of teaching, because being abstracted after all, It often uses teaching aid and carrys out lecture experiment.In demonstration, branch is arranged usually using experimental bench in current teaching aid on experimental bench Point installs lever on fulcrum, rises to the bait in lever and link up with code, adjusts the weight of fulcrum two sides torque arm length and hook code, comes so that thick stick Bar balance, but the device can only demonstrate lever in demonstration, the meeting of student's anxiety is so that lever run-off the straight causes counterweight de- It falls, and the device can only use counterweight, test effect is unsatisfactory.

Therefore, be based on drawbacks described above, in teaching aid technical field, for lever balance experimental provision there are still research and Improved demand, this is also a research hotspot and emphasis in current teaching aid technical field, and even more the utility model obtains Where the starting point of completion and power.

Utility model content:

The utility model overcomes the deficiencies of existing technologies, and provides a kind of lever balance experimental provision.

Technical problem to be solved in the utility model is implemented with the following technical solutions: a kind of lever balance experiment dress It sets, including bracket and equilateral four-bladed vane, is hinged on bracket at the center of the four-bladed vane, four-bladed vane two sides are hung respectively There is object, the pedestal lower end level is equipped with the meter ruler for reading.

Preferably, the four-bladed vane is hinged on the protrusion of bracket via the through-hole of the center, the protrusion and The connection of light rope one end, the light rope other end are connected with counterweight.

Preferably, the meter ruler includes the graduated scale for being symmetricly set on light rope both sides, zero quarter in the graduated scale It is overlapped at degree with light rope.

Preferably, the four-bladed vane is equipped with several hooks for hanging object.

Preferably, each edge is equipped with nut and screw rod for adjustment error on the four-bladed vane, described Nut driving is on screw rod.

Preferably, the object includes counterweight and stone.

Compared with prior art, the utility model has the following beneficial effects:

1. lever main body is " cross " four-bladed vane, the arm of force is found out by lever itself adjusting；

2. when measuring arm of force, by rotating scale ruler, finding out corresponding integer graduation mark, similar figures is recycled to prove out lever original Reason；

3. probe into lever principle, hook code can not had to, the object of any weight can be used to probe into.

Detailed description of the invention:

FIG. 1 is a schematic structural view of the utility model；

Fig. 2 is the utility model four-bladed vane structural schematic diagram；

In figure: 1~bracket；2~four-bladed vane；21~through-hole；22~protrusion；3~meter ruler；4~gently restrict；5~hook；6~ Nut；7~screw rod.

Specific embodiment:

In order to be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, under Face combination is specifically illustrating and embodiment, furthers elucidate the utility model.

Embodiment 1:

As depicted in figs. 1 and 2, a kind of lever balance experimental provision, including bracket 1 and equilateral four-bladed vane 2, four-bladed vane 2 Center at be hinged on bracket 1,2 two sides of four-bladed vane are hung with object respectively, and 1 lower end level of bracket is equipped with the rice for reading Ruler 3.

In middle school physical experiment, lever balance experiment is a key points and difficulties of teaching, because being abstracted after all, It often uses teaching aid and carrys out lecture experiment.In demonstration, branch is arranged usually using experimental bench in current teaching aid on experimental bench Point installs lever on fulcrum, rises to the bait in lever and link up with code, adjusts the weight of fulcrum two sides torque arm length and hook code, comes so that thick stick Bar balance, but the device can only demonstrate lever in demonstration, the meeting of student's anxiety is so that lever run-off the straight causes counterweight de- It falling, and the device can only use counterweight, test effect is unsatisfactory, a kind of lever balance device provided by the utility model, Lever main body is " cross " four-bladed vane 2, finds out the arm of force by lever itself adjusting；When measuring arm of force, by rotating scale ruler, Corresponding integer graduation mark is found out, similar figures is recycled to prove out lever principle；When probing into lever principle, hook code can not had to, it can It is probed into using the object of any weight.

As depicted in figs. 1 and 2, specifically, four-bladed vane 2 is hinged on the protrusion 22 of bracket 1 via the through-hole 21 of the center On, protrusion 22 is connected with 4 one end of light rope, and 4 other ends of light rope are connected with counterweight.

As shown in Figure 1, four-bladed vane 2 is equipped with the hook 5 for hanging object, in this way, being equipped with hook 5 on four-bladed vane 2 Counterweight can be replaced in 2 different location of cross convenient for experimenter.

The utility model is after the preparation, it is contemplated that four-bladed vane is not that quality is uniform, and four-bladed vane exists during fabrication to be added Work error can cause centainly so that the four-bladed vane 2 being hinged on protrusion 22 is not at dynamic balance state when rotated to experiment Error improve experimental precision and accuracy, each edge is equipped with flat for adjusting on four-bladed vane 2 to overcome the error The nut 6 and screw rod 7 for the error that weighs, nut 6 are screwed on screw rod 7.

In order to improve the applicability of the utility model, the object of suspended bag can be counterweight and stone on four-bladed vane 2.

Embodiment 2:

As shown in Figure 1, the present embodiment structure and 1 structure of embodiment are essentially identical, something in common is no longer repeated, difference It is, when carrying out probing into lever principle experiment using the utility model, needs the weight and object distance cross of binding object The horizontal distance of 2 center of plate is probed into, and for the ease of reading, meter ruler 3 is the scale for being symmetricly set on 4 both sides of light rope Ruler is overlapped at the zero graduation in graduated scale with light rope 4, we can read level of the left-right position apart from rotation center easily Position.

The characteristics of basic principles and main features and the utility model of the utility model have been shown and described above.Current row The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also It will have various changes and improvements, these changes and improvements are both fallen in the range of claimed invention.This is practical new The claimed range of type is defined by the appending claims and its equivalent thereof.

Claims (6)

1. a kind of lever balance experimental provision, including bracket (1) and equilateral four-bladed vane (2), which is characterized in that the cross It is hinged at the center of plate (2) on bracket (1), four-bladed vane (2) two sides are hung with object, the bracket (1) lower end water respectively The flat meter ruler (3) being equipped with for reading.

2. lever balance experimental provision according to claim 1, which is characterized in that the four-bladed vane (2) is via wherein Through-hole (21) at the heart is hinged on the protrusion (22) of bracket (1), and the protrusion (22) are connected with light rope (4) one end, described Light rope (4) other end be connected with counterweight.

3. lever balance experimental provision according to claim 1, which is characterized in that the meter ruler (3) includes symmetrically setting The graduated scale on gently rope (4) both sides is set, is overlapped at the zero graduation in the graduated scale with light rope (4).

4. lever balance experimental provision according to claim 1, which is characterized in that the four-bladed vane is equipped with several use In the hook of hanging object.

5. lever balance experimental provision according to claim 1 or 4, which is characterized in that the four-bladed vane (2) is every upper While being equipped with the nut (6) and screw rod (7) for adjustment error, the nut (6) is screwed on screw rod (7).

6. lever balance experimental provision according to claim 1, which is characterized in that the object includes counterweight and stone Block.