CN205384793U - Physical lever teaching aid convenient to carry and demonstrate - Google Patents

Abstract

A physical lever teaching aid that is easy to carry and demonstrate, relates to the field of teaching aids for physics teaching. The device is simple and elegant, not redundant, can be quickly disassembled and disassembled without other tools, and can be assembled and disassembled manually. After disassembly, put it into the storage box, which is low in weight and easy to carry. The base of the device is provided with a column shaft, and the fulcrum column is embedded on the top of the column shaft through a balance direction control plate and an embedded groove. The left and right sides of the fulcrum column are symmetrical structures, and the inner shell of the dynamic resistance arm is marked with scales Can move back and forth, the outer casing of the dynamic resistance arm and the inner casing of the dynamic resistance arm are fixed by fixing nuts, and the weight includes a hook and a hanging beam, and is connected with a hanging ring arranged at one end of the inner casing of the dynamic resistance arm by a hanging wire.

Description

A physical lever teaching aid that is easy to carry and demonstrate

technical field

The utility model relates to the field of teaching aids for physics teaching, in particular to a physical lever teaching aid which is easy to carry and demonstrate.

Background technique

Physics is a natural science that studies the most basic structure of the material world, the most common interaction, the most general law of motion, and the experimental methods and thinking methods used. In the existing physics teaching, many physical experiments are required to demonstrate to students, so as to better combine classroom theoretical knowledge with practice. Many concepts, laws, and laws in physics textbooks are introduced, derived, and verified through experiments, especially in the field of mechanics. In the physical lever balance test, the length of the lever is not adjustable when the lever is balanced. Obtaining multiple sets of data requires levers of different lengths, which is cumbersome to operate, time-consuming and laborious, not easy to carry, and low in teaching efficiency.

In physics textbooks, there are no special teaching aids when studying the balance conditions of levers. Teachers can only let students understand the principle of levers theoretically, and cannot explain them in real objects. It is difficult for students to understand. Therefore, lever teaching apparatus has appeared on the market, and existing lever teaching apparatus still has many problems when using:

1. Most of the existing physical lever teaching devices with adjustable length are inconvenient to control the length of the left and right sides of the lever, and the operation is inconvenient.

2. When the lever is out of balance, the sliders at the left and right ends that are used to connect the counterweights will slide on the cross bar, causing the counterweights to fall and injure the user.

3. The device is complicated and difficult to carry.

4. The assembly is complicated, which affects the teaching efficiency.

Utility model content

The utility model aims at the problems existing in the design of the current physical lever teaching aid, and proposes a physical lever teaching aid which is easy to carry and demonstrate.

The technical scheme adopted by the utility model to solve the above technical problems is: a physical lever teaching aid that is easy to carry and demonstrate, mainly including a base, a column shaft, a fulcrum column, a dynamic resistance arm outer shell, a dynamic resistance arm inner shell, a fixing nut and a weight code, characterized in that:

A column shaft is arranged on the base, and the column shaft and the base are of an integrated structure; a semicircular groove is arranged on the upper end of the column shaft, and a balance direction control board is built in the groove; the lower part of the fulcrum column is a semicircular convex body, and the convex body The lower part is provided with an embedded groove of the balance direction control plate, and the fulcrum column is embedded on the top end of the column shaft through the balance direction control plate and the embedded groove,

The left and right sides of the fulcrum column are symmetrical structures, and its two ends are respectively connected with the outer shell of the dynamic resistance arm through end threads, and one end of the inner shell of the dynamic resistance arm is embedded in the outer shell of the dynamic resistance arm, and the inner shell of the dynamic resistance arm There are scales marked on it, which can move back and forth. The outer shell of the dynamic resistance arm and the inner shell of the dynamic resistance arm are fixed by fixing nuts. The weight includes a hook and a hanging beam. connect.

The base, the column shaft, the fulcrum column, the outer shell of the dynamic resistance arm and the inner shell of the dynamic resistance arm are all made of light aluminum alloy.

The beneficial effects of the utility model: the device is simple and generous, not redundant, quick disassembly and quick disassembly, no other tools are needed, and all can be manually assembled and disassembled. After disassembly, put it into the storage box, which is low in weight and easy to carry.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

Fig. 2 is an enlarged view of the structure of the weight of the utility model.

Fig. 3 is a schematic diagram of the explosion structure of the utility model.

detailed description

Below in conjunction with Fig. 1, Fig. 2 and 3 examples the utility model is described in further detail.

The technical scheme of the utility model is: a physical lever teaching aid that is easy to carry and demonstrate, mainly including a base 1, a column shaft 2, a fulcrum column 3, a dynamic resistance arm outer shell 4, a dynamic resistance arm inner shell 5, a fixed nut 9 and a weight Code 6, characterized in that:

The base 1 is provided with a column shaft 2, and the column shaft 2 is integrated with the base 1; the upper end of the column shaft 2 is provided with a semicircular groove, and a balance direction control plate 8 is built in the groove; the lower part of the fulcrum column 3 It is a semicircular convex body, and the lower part of the convex body is provided with an embedded groove of a balance direction control plate 8, and the fulcrum column 3 is embedded in the top end of the column shaft 2 through the balance direction control plate 8 and the embedded groove,

The left and right sides of the fulcrum column 3 are symmetrical structures, and its two ends are respectively connected with the power resistance arm shell 4 through end threads, and one end of the power resistance arm inner shell 5 is embedded in the power resistance arm shell 4. The resistance arm inner shell 5 is marked with a scale, which can move back and forth. The dynamic resistance arm outer shell 4 and the dynamic resistance arm inner shell 5 are fixed by the fixing nut 9. The weight 6 includes a hook 6-1 and a hanging beam 6-2. It is connected with the hanging ring 7 arranged at one end of the inner casing 5 of the dynamic resistance arm through a hanging wire.

Specific principles:

The utility model is a demonstration test device for the principle of physical leverage. The base and the column shaft are used for support, the fulcrum column is a flat mass point, the inner shell is stretched to be a dynamic resistance arm, and the weight is an external force. The balance direction control plate in the groove on the upper part of the column shaft controls the rotation of the semicircular convex body at the bottom of the fulcrum column, that is, it can only swing up and down, not left and right.

Device demo steps:

1. Calculate the length of the power arm, the resistance arm, the size of the external load force, and the mass of the added weight.

2. The dynamic resistance arm is adjusted and fixed on the fulcrum column according to the calculated length.

3. Hang the weight on the end ring of the dynamic resistance arm to demonstrate physical balance.

4. It can be freely combined according to the length of the force arm and the mass of the loaded weight, and the students can calculate and demonstrate.

The foregoing content has described the specific embodiment of the present utility model with reference to Fig. 1, Fig. 2 and Fig. 3, and those skilled in the art should understand that the product of the present utility model is not only limited to the embodiment described above, without departing from the utility model Various modifications can be made within the spirit of the invention, and the modifications should also be included within the scope of the present invention. The scope of the present invention should be defined by the appended claims and their equivalents.

Claims (2)

1. the lever used for physics teaching being easy to carry and demonstrate, mainly include base (1), axis of a cylinder (2), pivot pole (3), dynamic drag arm shell (4), dynamic drag arm inner shell (5), fixing nut (9) and counterweight (6), it is characterised in that:

Being provided with axis of a cylinder (2) on described base (1), described axis of a cylinder (2) and base (1) are integral type structure；Axis of a cylinder (2) upper end is provided with semicircle groove, and groove is built-in with balance direction controlling plate (8)；Described pivot pole (3) bottom is semicircle convex body, convex body bottom is provided with the interior caulking groove of balance direction controlling plate (8), described pivot pole (3) is embedded in the top of axis of a cylinder (2) by balance direction controlling plate (8) and interior caulking groove

The left and right sides of described pivot pole (3) is symmetrical structure, its two ends are connected by end thread with dynamic drag arm shell (4) respectively, one end of dynamic drag arm inner shell (5) is embedded in dynamic drag arm shell (4), described dynamic drag arm inner shell (5) is marked with yardstick, can move back and forth, dynamic drag arm shell (4) and dynamic drag arm inner shell (5) are fixed by fixing nut (9), described counterweight (6) includes hook (6-1) and drop in beam (6-2), it is connected with the link (7) being arranged on dynamic drag arm inner shell (5) one end by hanging wire.

2. a kind of lever used for physics teaching being easy to carry and demonstrating according to claim 1, it is characterised in that described base (1), axis of a cylinder (2), pivot pole (3), dynamic drag arm shell (4) and dynamic drag arm inner shell (5) all use light aluminum alloy material to make.