CN211427648U

CN211427648U - Angular momentum conservation law demonstration instrument

Info

Publication number: CN211427648U
Application number: CN201820412055.7U
Authority: CN
Inventors: 张计才; 赵秋枝; 陈玲; 祝慧昌
Original assignee: Henan Normal University
Current assignee: Henan Normal University
Priority date: 2018-03-26
Filing date: 2018-03-26
Publication date: 2020-09-04
Anticipated expiration: 2028-03-26

Abstract

The utility model discloses an angular momentum conservation law demonstration appearance, fixed pulley one sets up in the inside lateral wall of vertical hollow rod, the clip sets up in the outside lateral wall of vertical hollow rod, the photogate is connected with the outside lateral wall of vertical hollow rod through horizontal connecting rod, the inside outer lane fixed connection with rolling bearing of hollow vertical rod upper end, the rolling bearing inner circle is provided with hollow rotating shaft, hollow rotating shaft's top and horizontal transparent hollow rod fixed connection, the horizontal transparent hollow rod internal symmetry of hollow rotating shaft both sides is provided with the mobilizable little iron ball of symmetry, horizontal transparent hollow rod internal symmetry between two little iron balls is provided with fixed pulley two, the one end of wire is fixed on the clip, the other end is connected with wire one and wire two, the horizontal transparent hollow rod outer wall directly over the photogate is provided with the piece that is in the light, the utility model is simple in operation, be favorable to arousing the study interest of student to physics.

Description

Angular momentum conservation law demonstration instrument

Technical Field

The utility model relates to a physics teaching aid technical field, concretely relates to angular momentum conservation law demonstration appearance for physical teaching.

Background

The angular momentum conservation law demonstrator in the market at present can only qualitatively demonstrate the phenomenon of angular momentum conservation, cannot quantitatively analyze the phenomenon, and is not beneficial to students to learn and understand relevant physical knowledge.

Disclosure of Invention

The utility model provides a technical problem provide an angular momentum conservation law demonstration appearance, the device is simple, verify that the principle is understandable, the repeatability of experimental operation is high, can verify angular momentum conservation law with accurate experimental data to arouse the student to the learning interest of physics.

In order to achieve the above object, the technical solution of the present invention is: angular momentum conservation law demonstration appearance, its characterized in that: the photoelectric door comprises a metal base, a hollow vertical rod, a rotating bearing, a first fixed pulley, a clamp, a lead, a photoelectric door and a transverse transparent hollow rod, wherein the first fixed pulley is arranged on the inner side wall of the vertical hollow rod, the clamp is arranged on the outer side wall of the vertical hollow rod, the photoelectric door is connected with the outer side wall of the vertical hollow rod through a horizontal connecting rod, the bottom of the hollow vertical rod is arranged on the metal base, the inner part of the upper end of the hollow vertical rod is fixedly connected with the outer ring of the rotating bearing, the inner ring of the rotating bearing is provided with a hollow rotating shaft, the top of the hollow rotating shaft is fixedly connected with the transverse transparent hollow rod, small symmetrical movable iron balls are symmetrically arranged in the transverse transparent hollow rod on two sides of the hollow rotating shaft, a second fixed pulley is symmetrically arranged in the transverse transparent hollow rod between the two small iron balls, one end of the lead sequentially passes through the vertical hollow rod and the hollow rotating shaft and is connected with a, the outer wall of the transverse transparent hollow rod right above the photoelectric door is provided with a light blocking sheet.

Furthermore, scale marks are arranged on the pipe wall of the transverse transparent hollow pipe along the axial direction of the transverse transparent hollow pipe.

Furthermore, a level bar is arranged on the upper surface of the metal base.

Furthermore, a leveling screw is arranged on the lower surface of the metal base.

Furthermore, one side of the small ball far away from the fixed pulley is provided with a third wire which is connected with the end part of the transverse transparent hollow rod.

Furthermore, baffles are arranged on the surfaces of the grooves of the first fixed pulley and the second fixed pulley.

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

1. the rotation period is tested by using a photoelectric gate, and the law of conservation of angular momentum is verified by using accurate data;

2. the phenomenon of observing the conservation of angular momentum in the past is more convincing;

3. the demonstrator is simple to operate and is beneficial to arousing the learning interest of students on physics.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Description of the drawings: 1. the photoelectric door comprises a metal base, 2, a hollow vertical rod, 3, a rotating bearing, 4, a first fixed pulley, 5, a clamp, 6, a wire, 7, a photoelectric door, 8, a transverse transparent hollow rod, 9, a hollow rotating shaft, 10, a small iron ball, 11, a second fixed pulley, 12, a first wire, 13, a second wire, 14, a light blocking sheet, 15, a horizontal ruler, 16, a leveling screw, 17 and a third wire.

Detailed Description

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The technical scheme of the utility model is described in detail with the attached drawings, the demonstration instrument for the conservation law of angular momentum comprises a metal base 1, a hollow vertical rod 2, a rolling bearing 3, a fixed pulley I4, a clamp 5, a lead 6, a photoelectric door 7 and a transverse transparent hollow rod 8, wherein the fixed pulley I is arranged on the side wall inside the vertical hollow rod, the clamp is arranged on the side wall outside the vertical hollow rod, the photoelectric door is connected with the side wall outside the vertical hollow rod through a horizontal connecting rod, the bottom of the hollow vertical rod is arranged on the metal base, the inside of the upper end of the hollow vertical rod is fixedly connected with the outer ring of the rolling bearing, the inner ring of the rolling bearing is provided with a hollow rotating shaft 9, the top of the hollow rotating shaft is fixedly connected with the transverse transparent hollow rod, symmetrical movable small iron balls 10 are symmetrically arranged in the transverse transparent hollow rod at the two sides of the hollow rotating shaft, and fixed pulleys II 11 are, one end of a wire is fixed on a clamp, the other end of the wire sequentially passes through a vertical hollow rod and a hollow rotating shaft and is connected with a first wire 12 and a second wire 13 which are respectively connected with small iron balls and then pass through a fixed pulley II, a light blocking sheet 14 is arranged on the outer wall of a transverse transparent hollow rod right above a photoelectric door, when demonstration is needed, the wire is pulled to drive a first wire falling and the second wire to pull the small balls to a symmetrical position, then the clamp is used for clamping and fixing the wire, the transverse transparent hollow rod is pulled to rotate by hands, the rotation period of the transverse transparent hollow rod is tested through the photoelectric door and the light blocking sheet, the clamp is released after the photoelectric door detects the rotation period of the transverse transparent hollow rod, the small iron balls do centrifugal motion under the action of centrifugal force, the clamp is used for fixing the position again after the small iron balls move to a proper position, the rotation period at the moment is detected through, the rotation radius can be changed for many times, multiple groups of experimental data are measured, the relation between the rotation period and the rotation radius is compared, and the conservation of angular momentum is verified.

The pipe wall of the transverse transparent hollow pipe along the axial direction is provided with scale marks, so that the position of the small ball is conveniently measured, the surfaces of the grooves of the fixed pulley I and the fixed pulley II are provided with baffles, the wire can be effectively prevented from being separated from the grooves of the first fixed pulley and the second fixed pulley 2 when the wire is in a loose state, the level ruler 15 is arranged on the upper surface of the metal base, whether the metal base is parallel or not is measured through the level ruler, a leveling screw 16 is arranged on the lower surface of the metal base, which can level the uneven metal base and ensure the accuracy of the experiment, a third lead 17 is arranged on one side of the small ball far away from the fixed pulley and is connected with the end part of the transverse transparent hollow rod, the position of the small ball can be changed through the pulling action of the third wire, and the small ball can be effectively prevented from moving when the clamp loosens the wires, the problem of experimental accidents caused by the fact that small balls fly out of the transverse transparent hollow rod due to artificial errors.

The foregoing shows and describes the general principles of the present invention, with its principal features and advantages, and further, various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. Angular momentum conservation law demonstration appearance, its characterized in that: the photoelectric door comprises a metal base, a hollow vertical rod, a rotating bearing, a first fixed pulley, a clamp, a lead, a photoelectric door and a transverse transparent hollow rod, wherein the first fixed pulley is arranged on the inner side wall of the vertical hollow rod, the clamp is arranged on the outer side wall of the vertical hollow rod, the photoelectric door is connected with the outer side wall of the vertical hollow rod through a horizontal connecting rod, the bottom of the hollow vertical rod is arranged on the metal base, the inner part of the upper end of the hollow vertical rod is fixedly connected with the outer ring of the rotating bearing, the inner ring of the rotating bearing is provided with a hollow rotating shaft, the top of the hollow rotating shaft is fixedly connected with the transverse transparent hollow rod, small symmetrical movable iron balls are symmetrically arranged in the transverse transparent hollow rod on two sides of the hollow rotating shaft, a second fixed pulley is symmetrically arranged in the transverse transparent hollow rod between the two small iron balls, one end of the lead sequentially passes through the vertical hollow rod and the hollow rotating shaft and is connected with a, the outer wall of the transverse transparent hollow rod right above the photoelectric door is provided with a light blocking sheet.

2. The angular momentum conservation law demonstrator according to claim 1, wherein: the pipe wall of the transverse transparent hollow pipe along the axial direction is provided with scale marks.

3. The angular momentum conservation law demonstrator according to claim 1, wherein: the upper surface of the metal base is provided with a level bar.

4. The angular momentum conservation law demonstrator according to claim 1, wherein: the lower surface of the metal base is provided with a leveling screw.

5. The angular momentum conservation law demonstrator according to claim 1, wherein: and one side of the small ball far away from the fixed pulley is provided with a third conducting wire which is connected with the end part of the transverse transparent hollow rod.

6. The angular momentum conservation law demonstrator according to claim 1, wherein: and baffle plates are arranged on the surfaces of the grooves of the first fixed pulley and the second fixed pulley.