CN212084466U

CN212084466U - Demonstration lever for accurately reading force arm

Info

Publication number: CN212084466U
Application number: CN202020821481.3U
Authority: CN
Inventors: 刘信生; 周江; 刘蒙
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-12-04
Anticipated expiration: 2030-05-18

Abstract

The utility model discloses a demonstration lever of the accurate arm of force that reads of physics lever experiment teaching technical field, including demonstration lever main part and weight portion of accomodating. The utility model discloses a rotatory scale plate with the pivot with the lever makes scale plate scale mark and the silk thread coincidence that hangs the weight, can comparatively accurately directly read out arm of force numerical value, and the weight drops and keeps the experiment back weight when utilizing the weight portion of accomodating to reduce the experiment simultaneously, compares with current demonstration lever, has solved the arm of force and has directly read the difficulty and the weight drops and damage, lose the problem.

Description

Demonstration lever for accurately reading force arm

Technical Field

The utility model relates to a physics lever experiment teaching field specifically is a demonstration lever of the accurate arm of force that reads.

Background

Many concepts, laws and laws in junior high school physics textbooks are introduced, derived and verified through experiments. In teaching, the lever principle is demonstrated, so that students can understand the theorem of the lever more vividly, and the lever principle is one of important principles in physical knowledge according to the requirements of physical teaching.

But demonstration lever in the school is learned at present, the arm of force directly reads the difficulty and often hangs the weight earlier and lead to the lever slope because of one of them one end of lever when beginning the experiment, and the weight drops, causes the damage to the weight, and the weight is preserved improperly after the experiment festival, loses, and the follow-up experiment of influence goes on.

Based on this, the utility model designs a demonstration lever of the accurate reading arm of force to solve above-mentioned problem.

Disclosure of Invention

An object of the utility model is to provide a theme to the arm of force that proposes in solving above-mentioned background art directly reads the problem that difficulty and weight fragile are lost.

In order to achieve the above object, the utility model provides a following technical scheme: a demonstration lever for accurately reading a force arm comprises a demonstration lever main body and a weight storage part, wherein the weight storage part is in sliding fit with the demonstration lever main body;

the lever main body comprises a base, a supporting rod is fixedly connected to the base, a supporting plate is fixedly connected to the supporting rod, a rotating shaft is fixedly connected to the top end of the supporting rod, a scale plate is rotatably connected to one side of the rotating shaft, a lever is rotatably connected to the top end of the rotating shaft for demonstration, balance nuts are respectively fixedly connected to two ends of the lever, the lever is slidably connected with a sliding block, a fastening screw is in threaded connection with the top end of the sliding block, a silk thread is fixedly connected with the sliding block, a hook is fixedly connected with the silk thread, a fixed pulley is in; the existing demonstration lever is often directly measured through a ruler when the force arm is read, the ruler directly measures the force arm because the axis position of a lever rotating shaft is difficult to accurately measure, and the experimental result has larger error;

the weight storage part comprises a lifting plate which is assembled on the support rod in a sliding mode, the top of the lifting plate is connected with a storage box in a sliding mode, the bottom plate is fixedly connected with a shielding shell, the bottom plate is fixedly connected with a lead screw nut, the lead screw nut is connected with a lead screw in a threaded mode, and the lead screw is rotatably connected with the base; present demonstration lever often hangs the weight earlier because of lever one of them end and leads to the lever slope when beginning the experiment, and the weight drops, causes the damage to the weight, and the weight is preserved improper simultaneously, and easy rust is lost, and the follow-up experiment of influence goes on, the utility model discloses a drive lead screw drives screw-nut to realize the regulation of lifter plate height, when beginning the experiment, the weight of hanging in lever one end first can be placed on the lifter plate, can prevent effectively that the weight from droing, after the experiment, places the weight in the containing box, prevents that the weight from damaging, loses.

As a further scheme of the utility model, the shielding shell is fixed with a guide frame, the guide frame is connected with a guide rod in a sliding manner, one end of the guide rod is fixedly connected with an arc-shaped slider, and a reset spring is arranged between the arc-shaped slider and the guide frame; the experiment is ended, and after the receiver was placed to the weight, when pushing away the receiver to deepest, the receiver contacted with the arc slider, forced reset spring compression, and the guide bar moves to the right side, and the receiver moves to deepest, and reset spring drives the guide bar and moves to the left and resets, prevents the receiver back-and-forth movement.

As a further proposal of the utility model, the upper surface of the bottom plate is provided with a chute, and a slide block arranged at the bottom of the storage box is assembled in the chute in a sliding way; through slider and spout cooperation, realize the directional removal of receiver.

As a further proposal of the utility model, a baffle plate is arranged inside the storage box; weights used in the experiment are placed into corresponding partition plates according to the specification, and the weights are orderly stored.

As a further scheme of the utility model, lead screw top fixedly connected with hand wheel increases the arm of force, is convenient for rotate the lead screw.

Compared with the prior art, the invention has the beneficial effects that:

1. the utility model makes the scale mark of the scale plate coincide with the silk thread of the hanging weight by rotating the scale plate which is the same with the rotating shaft of the lever, directly and accurately reads the force arm value, and solves the problem that the force arm is difficult to accurately read;

2. the utility model discloses an adjust the height of lifter plate, make and hang the weight in lever one end earlier and can place on the lifter plate, can prevent effectively that the weight from droing, after the experiment, place the weight in the containing box, prevent that the weight from damaging, losing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first schematic view of the overall structure of the present invention (hidden right shielding shell);

FIG. 2 is a second schematic view of the structure of FIG. A (hidden right shielding shell) of the present invention;

FIG. 3 is an enlarged view of FIG. 1 at A;

in the drawings, the components represented by the respective reference numerals are listed below:

the device comprises a base 11, a support rod 12, a support plate 13, a scale plate 14, a lever 15, a slide block 16, a fastening screw 17, a silk thread 18, a hook 19, a fixed pulley 110, a fastening nut 111, a balance nut 112, a rotating shaft 113, a lifting plate 21, a storage box 22, a shielding shell 23, a screw nut 24, a screw rod 25, a guide frame 231, a guide rod 232, an arc-shaped slide block 233, a return spring 234 and a hand wheel 251.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a demonstration lever for accurately reading a force arm comprises a demonstration lever main body and a weight storage part, wherein the weight storage part is in sliding fit with the demonstration lever main body;

the demonstration lever main body comprises a base 11, a supporting rod 12 is fixedly connected with the base 11, a supporting plate 13 is fixedly connected with the supporting rod 12, a rotating shaft 113 is fixedly connected with the top end of the supporting rod, a scale plate 14 is rotatably connected to one side of the rotating shaft 113, a lever 15 is rotatably connected with the top end of the rotating shaft 113, two ends of the lever 15 are respectively fixedly connected with a balance nut 112, the lever 15 is slidably connected with a sliding block 16, a fastening screw 17 is in threaded connection with the top end of the sliding block 16, a silk thread 18 is fixedly connected with the sliding block 16, a hook 19 is fixedly connected with the silk thread 18, a; the existing demonstration lever is usually calculated through an angle or directly measured through a ruler when the force arm is read, the calculation of the angle usually needs to consume a large amount of time and is not suitable for a plurality of groups of experiments, the direct measurement of the ruler can be realized because the axle center position of a lever rotating shaft is difficult to accurately measure, and the experiment result has large errors, the utility model discloses an adjusting a balance nut 112 to adjust a lever 15 to a horizontal position and then adjusting a fixed pulley 110 to change the direction of the acting force of a weight and the number of the weights during the experiment, rotating a scale plate 14 to enable scale lines on the scale plate 14 to coincide with a silk thread 18 when the force arm is measured, and the size of the force;

the weight storage part comprises a lifting plate 21 which is assembled on the support rod 12 in a sliding mode, the top of the lifting plate 21 is connected with a storage box 22 in a sliding mode, a shielding shell 23 is fixedly connected with a bottom plate 21, a lead screw nut 24 is fixedly connected with the bottom plate 21, the lead screw nut 24 is connected with a lead screw 25 in a threaded mode, the lead screw 25 and the base 11 are rotatably connected with an existing demonstration lever, and when an experiment is started, the lever is always inclined due to the fact that weights are hung at one end of the lever firstly, the weights; meanwhile, the weights are improperly stored, easily rusted and lost, and subsequent experiments are influenced, the screw rod nut is driven by the screw rod 25, so that the height of the lifting plate 21 is adjusted, when the experiment is started, the weights which are firstly hung at one end of the lever 15 can be placed on the lifting plate 21, the weights can be effectively prevented from falling off, and after the experiment is finished, the weights are placed in the storage box 22, so that the weights are prevented from being damaged and lost;

as a further scheme of the present invention, the shielding shell 23 fixes the guiding frame 231, the guiding frame 231 is slidably connected with the guiding rod 232, one end of the guiding rod 232 is fixedly connected with the arc-shaped sliding block 233, and a return spring 234 is arranged between the arc-shaped sliding block 233 and the guiding frame 231; the experiment is ended, and after receiver 22 was placed to the weight, when pushing away receiver 22 to the deepest, receiver 22 and arc slider 233 contacted, force reset spring 234 compression, and guide bar 232 moves to the right, and receiver 22 goes to the deepest, and reset spring 234 drives guide bar 2352 and moves left and resets, prevents receiver 22 back-and-forth movement.

As a further proposal of the utility model, the upper surface of the bottom plate 21 is provided with a chute, and a slide block arranged at the bottom of the storage box 22 is assembled in the chute in a sliding way; through slider and spout cooperation, realize receiver 22's directional removal.

As a further proposal of the utility model, a baffle is arranged inside the storage box 22; weights used in the experiment are placed into corresponding partition plates according to the specification, and the weights are orderly stored.

As a further aspect of the present invention, the lead screw 25 top fixedly connected with hand wheel 251 increases the force arm, and is convenient for rotating the lead screw 25.

The working principle is as follows: during the experiment, rotate hand wheel 251 drive lead screw 15, make lifter plate 21 rise to suitable height, adjust balance nut 112, make lever 15 arrange horizontal position in, according to specific experiment demand, adjust 16 behind the suitable position of slider, screw up fastening screw 17, then adjust fixed pulley 110 position, screw up fastening nut 111, hang the weight on couple 19, place the weight in the lifter plate 21 after, then hang the opposite side weight, make lever 15 arrange the level in, rotate scale mark and silk thread 18 coincidence on scale plate 14 after that, can be directly and more accurate read out the arm of force size, after the experiment is accomplished, place the weight in receiver 22, at last, push away receiver 22 to deepest.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides an accurate demonstration lever that reads arm of force, includes demonstration lever main part and weight portion of accomodating, its characterized in that: the weight containing part is in sliding fit with the demonstration lever main body;

the demonstration lever main body comprises a base (11), the upper surface of the base (11) is fixedly connected with a supporting rod (12), a supporting plate (13) is fixedly connected on the left side of the supporting rod (12), a rotating shaft (113) is fixedly connected at the top end of the supporting rod, one side of the rotating shaft (113) is rotatably connected with a scale plate (14), the top end of the rotating shaft (113) is rotatably connected with a lever (15), two ends of the lever (15) are respectively and fixedly connected with a balance nut (112), two sides of the lever (15) are respectively and slidably connected with a sliding block (16), the top end of the sliding block (16) is connected with a fastening screw (17) in a threaded manner, the sliding block (16) is fixedly connected with a silk thread (18), the silk thread (18) is fixedly connected with a hook (19), the supporting plate (13) is connected with a fixed pulley (110) in a sliding mode, and a rotating shaft of the fixed pulley (110) is connected with a fastening nut (111) in a threaded mode;

the weight storage part comprises a lifting plate (21) assembled on the support rod (12) in a sliding mode, the top of the lifting plate (21) is connected with a storage box (22) in a sliding mode, the lifting plate (21) is fixedly connected with a shielding shell (23), the lifting plate (21) is fixedly connected with a lead screw nut (24), the lead screw nut (24) is connected with a lead screw (25) in a threaded mode, and the lead screw (25) is connected with the base (11) in a rotating mode.

2. A demonstration lever for accurate reading of moment arms according to claim 1 wherein: the shielding shell (23) is fixed with a guide frame (231), the guide frame (231) is connected with a guide rod (232) in a sliding mode, one end of the guide rod (232) is fixedly connected with an arc-shaped sliding block (233), and a reset spring (234) is arranged between the arc-shaped sliding block (233) and the guide frame (231).

3. A demonstration lever for accurate reading of moment arms according to claim 1 wherein: the sliding groove is formed in the upper surface of the lifting plate (21), and a sliding block arranged at the bottom of the storage box (22) is assembled in the sliding groove in a sliding mode.

4. A demonstration lever for accurate reading of moment arms according to claim 1 wherein: the storage box (22) is internally provided with a partition plate.

5. A demonstration lever for accurate reading of moment arms according to claim 1 wherein: the top end of the screw rod (25) is fixedly connected with a hand wheel (251).