CN215182632U

CN215182632U - Magnetic suction type lever variable pulley demonstration instrument

Info

Publication number: CN215182632U
Application number: CN202120895645.1U
Authority: CN
Inventors: 朱飞; 杨广武; 张守超; 江越
Original assignee: Tianjin Yiyang Huarui Technology Co ltd; Tianjin Chengjian University
Current assignee: Tianjin Yiyang Huarui Technology Co ltd; Tianjin Chengjian University
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-12-14
Anticipated expiration: 2031-04-28

Abstract

The utility model relates to a physical teaching demonstration instrument technical field, especially a formula lever becomes pulley demonstration appearance is inhaled to magnetism. The device comprises a lever group consisting of at least four levers, namely a first lever, a second lever, a third lever and a fourth lever, wherein the middles of the four levers are connected together through a central shaft and locked through nuts, two ends of each lever are respectively provided with a combined groove, the combined groove is formed by fixing two side blocks and two middle blocks in the middle through screw holes, the length of each side block is greater than that of the middle block, one side block in the first lever and the fourth lever is fixed with the lever into a whole, one middle block in the second lever and the third lever is fixed with the lever into a whole, the first lever and the fourth lever are arranged in a mirror image mode, and the second lever and the third lever are arranged in a mirror image mode. The device has the advantages of simple structure, convenient assembly, portability, easy adsorption on the surfaces of flat plates such as a blackboard and the like, convenient demonstration, convenient observation for students, visual image and capability of improving the teaching effect and quality.

Description

Magnetic suction type lever variable pulley demonstration instrument

Technical Field

The utility model relates to a physical teaching demonstration instrument technical field, especially a formula lever becomes pulley demonstration appearance is inhaled to magnetism.

Background

The lever and the pulley are common tools in daily life and production and are simple machines contacted by junior middle school physical students. The lever is a hard rod which can rotate around a fixed point under the action of force. The pulley is a small wheel with a groove on the periphery and capable of rotating around a shaft. In fact, the pulley is a deformation mode of the lever, and the student can hardly understand visually in the teaching process. The current teaching equipment can not be changed into a pulley through a lever, and the aim of visual teaching can not be achieved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a problem among the above-mentioned background of effectual solution has proposed a formula lever becomes pulley demonstration appearance is inhaled to magnetism.

The specific technical scheme is as follows;

the utility model provides a formula lever becomes pulley demonstration appearance is inhaled to magnetism which characterized in that: the device comprises a lever group which is composed of at least four levers, namely a first lever, a second lever, a third lever and a fourth lever, wherein the middles of the four levers are connected together through a central shaft and locked through nuts, a circular magnet is fixed at one end of the central shaft, combination grooves are formed in two ends of each lever respectively and are formed by fixing two side blocks and two middle blocks in the middle through screw holes, the length of each side block is larger than that of the middle block, one side block in the first lever and one side block in the fourth lever are fixed with the lever into a whole, one middle block in the second lever and one middle block in the third lever are fixed with the lever into a whole, the first lever and the fourth lever are arranged in a mirror image mode, and the second lever and the third lever are arranged in a mirror image mode.

Preferably, the combined groove width of each lever is one fourth of the lever, and the thickness of the inner recess is 2 times of the thickness of the single lever.

Preferably, the first lever, the second lever, the third lever and the fourth lever are respectively provided with a linear state limiting hole and a rice state limiting hole, and are fixedly matched through screws.

Compared with the prior art, the beneficial effects of the utility model are that: simple structure, the equipment is convenient, and portable adsorbable in dull and stereotyped surfaces such as blackboard, the demonstration is convenient, makes things convenient for the student to observe, and is directly perceived image, can improve teaching effect and quality.

Drawings

FIG. 1 is a side view cross-sectional view of the present invention;

fig. 2 is an exploded side view of the lever of the present invention;

fig. 3 is a front view of the present invention;

fig. 4 is a developed 'rice' shaped drawing of the utility model.

Detailed Description

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

The following detailed description of the preferred embodiments of the present invention is provided in connection with the accompanying drawings. As shown in fig. 1-3, a magnetic type lever-variable pulley demonstrator comprises a combination groove 1, a lever group 2, a central shaft hole 3, a central shaft 4, a nut 5, a circular magnet 6, a linear-shaped position limiting hole 7 and a linear-shaped position limiting hole 8; the lever variable pulley demonstration instrument has two use states, wherein the initial state is in a straight shape, and the lever variable pulley demonstration instrument is used as a lever as shown in figure 3; the unfolded state is in a shape of Chinese character 'mi', and the roller is used as a deformation pulley as shown in figure 4.

A first lever 2-1, a second lever 2-2, a third lever 2-3 and a fourth lever 2-4 with a combined groove structure in the figure 2 are combined by adopting 3 movable squares and a single lever, then the four levers in the figure 2 are sequentially stacked from left to right, then a central shaft 4, a nut 5 and a circular magnet 6 are used for fixing, then a long screw is inserted into a linear state limiting hole 7 for fixing, the magnet 6 is adsorbed on a flat plate such as a blackboard, and the linear state lever is seen from side as in figure 1 and from front as in figure 3.

The limit screw is taken down, the four levers are unfolded to be in a shape like the Chinese character 'mi', the limit screw is inserted into the limit hole 8 in the shape like the Chinese character 'mi', the limit screw rotates around the central shaft 4 as shown in figure 4, the track of the groove is shown by a dotted line in the figure, and the limit screw is the deformed pulley in the shape like the Chinese character 'mi'. The rope stridees across the recess with the cotton rope static state, and heavy object is hung to cotton rope one end, and the cotton rope is slowly pulled to the other end with the dynamometer or bare-handed, can realize the pulley demonstration effect.

Operation example:

the lever is used, a straight-line-shaped lever shown in figure 3 is assembled, a fixing screw is installed in a straight-line-shaped limiting hole 7, the beam at two ends of the fulcrum is sleeved with a rope buckle, a proper number of hook codes are hung at the lower end of the lever, the position of the rope buckle is adjusted, the lever is in a horizontal balance state, a scale is attached to the lever, the number of scales is read, the exploration experiment of the balance condition of the lever can be completed, and the principle demonstration experiment of a physical balance can be performed in the state.

The deformable pulley is used, namely a fixed pulley is used by detaching a fixing screw of the linear-shaped limiting hole 7, unfolding the demonstration instrument into a linear-shaped state shown in figure 4, inserting the fixing screw into the linear-shaped limiting hole 8, and adsorbing the round magnet 6 on the blackboard. Two to three circles are wound by a cord with proper thickness in a combined groove of the pulley, one end of the cord is tied with a hook code, and the other end of the cord is pulled by hands or a dynamometer slowly, so that the deformation of the lever, and the nature and the characteristics of the fixed pulley can be demonstrated.

The magnet is removed, the pulley is slowly rotated and lifted by virtue of the thread rope, the hook code and the dynamometer, and the essence and the characteristics of the movable pulley can be demonstrated.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a formula lever becomes pulley demonstration appearance is inhaled to magnetism which characterized in that: the device comprises a lever group which is composed of at least four levers, namely a first lever, a second lever, a third lever and a fourth lever, wherein the middles of the four levers are connected together through a central shaft and locked through nuts, a circular magnet is fixed at one end of the central shaft, combination grooves are formed in two ends of each lever respectively and are formed by fixing two side blocks and two middle blocks in the middle through screw holes, the length of each side block is larger than that of the middle block, one side block in the first lever and one side block in the fourth lever are fixed with the lever into a whole, one middle block in the second lever and one middle block in the third lever are fixed with the lever into a whole, the first lever and the fourth lever are arranged in a mirror image mode, and the second lever and the third lever are arranged in a mirror image mode.

2. The magnetically-attracted lever variable pulley demonstration instrument according to claim 1, wherein the combined groove width of each lever is one quarter of the lever, and the internal depression thickness is 2 times the thickness of a single lever.

3. The magnetic attraction type lever-variable pulley demonstration instrument according to claim 1, wherein the first lever, the second lever, the third lever and the fourth lever are respectively provided with a linear state limiting hole and a rice state limiting hole and are fixedly matched with each other through screws.