Physics teaching lever principle demonstration device

Abstract

The utility model relates to the technical field of fixing supports, in particular to a physics teaching lever principle demonstration device. The device comprises a bottom plate and a supporting frame, one side of the supporting frame is provided with a rotating device, the rotating device comprises an L-shaped plate, the short arm end of the L-shaped plate is fixedly connected with a servo motor, the output end of the servo motor is fixedly connected with a driving bevel gear, the outer portion of the driving bevel gear is meshed with a driven bevel gear, and the driven bevel gear is fixedly connected with the driving bevel gear. And a rotating shaft is fixedly connected to the interior of the driven bevel gear, threaded rods are fixedly connected to the two ends of the rotating shaft, the arc surfaces of the threaded rods are in threaded connection with internal thread sleeve rods, and one sides of the internal thread sleeve rods are in sliding connection with first graduated scales. The problems that according to a traditional physics teaching lever principle demonstration device, the length of a force arm of a lever is fixed and cannot be adjusted, and when levers with different lengths need to be demonstrated, the lever needs to be replaced repeatedly, and consequently time is consumed are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fixed brackets, in particular to a physics teaching lever principle demonstration device. Background Art

[0002] The lever principle is one of the important theorems. The lever is divided into a labor-intensive lever, a labor-saving lever and an equal-arm lever. The lever principle is also called the "lever balance condition". To balance a lever, the two moments (the product of force and lever arm) acting on the lever must be equal; that is, power × power arm = resistance × resistance arm. To balance the lever, the power arm must be several times the resistance arm, and the resistance must be several times the power.

[0003] In the conventional physics teaching lever principle demonstration device in the prior art, the lever arm length is fixed and the length cannot be adjusted. When demonstrating levers of different lengths, the lever needs to be replaced repeatedly, which takes a long time and wastes learning time. Utility Model Content

[0004] The utility model aims to solve the problem that the lever arm length of the traditional physics teaching lever principle demonstration device in the prior art is fixed, and the lever needs to be repeatedly replaced when demonstrating levers of different lengths.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a physics teaching lever principle demonstration device, comprising a base plate and a support frame, a rotating device is provided on one side of the support frame, the rotating device comprises an L-shaped plate, a servo motor is fixedly connected to the short arm end of the L-shaped plate, an active bevel gear is fixedly connected to the output end of the servo motor, the outside of the active bevel gear is meshed with the driven bevel gear, the inside of the driven bevel gear is fixedly connected to a rotating shaft, both ends of the rotating shaft are fixedly connected to threaded rods, the arc surface of the threaded rod is threadedly connected to an internally threaded sleeve rod, and the internally threaded sleeve rod is fixedly connected to the internally threaded sleeve rod. A first scale is slidably connected to one side, a rotating ring is fixedly connected to one side of the first scale, a fixed L-plate is fixedly connected to the arc surface of the rotating ring, one end of the fixed L-plate is fixedly connected to the L-shaped plate, a fixed ring is fixedly connected to one side of the first scale, a fixed rod is rotatably connected inside the fixed ring, one end of the fixed rod is fixedly connected to the support frame, two second scales are slidably connected to one side of the first scale, one end of the second scale is fixedly connected to a connecting plate, one side of the connecting plate is fixedly connected to an internally threaded sleeve rod, and one end of the internally threaded sleeve rod is fixedly connected to a hook.

[0006] The effects achieved by the above components are: the servo motor is started to drive the active bevel gear to rotate, the active bevel gear rotates to drive the meshing driven bevel gear to rotate, the driven bevel gear rotates to drive the rotating shaft to rotate, the rotating shaft rotates to drive the threaded rod to rotate, the threaded rod rotates to drive the position of the internal threaded sleeve on the threaded rod to adjust, the movement of the internal threaded sleeve drives the connecting plate to move, so that the second scale moves on the first scale.

[0007] Preferably, one side of the L-shaped plate is fixedly connected to a limiting rod, and the arc surface of the limiting rod is slidably connected to a U-shaped guide plate.

[0008] The effect achieved by the above components is that the movement of the L-shaped plate drives the limiting rod to slide inside the U-shaped guide plate.

[0009] Preferably, a fixing plate is fixedly connected to one side of the U-shaped guide plate, and one end of the fixing plate is fixedly connected to the support frame.

[0010] The effects achieved by the above components are: achieving the effect of fixing the fixing plate and the supporting frame, and the effect of fixing the U-shaped guide plate.

[0011] Preferably, a fixing device is provided at the top of the bottom plate, and the fixing device comprises two supporting plates, one side of the two supporting plates is fixedly connected to the bottom plate, and one side of the supporting plates is fixedly connected to a connecting vertical plate.

[0012] The effects achieved by the above components are: achieving the effect of fixing the support plate and the connecting vertical plate.

[0013] Preferably, a slide bar is fixedly connected to one side of the connecting vertical plate, and arc surfaces of two slide bars are slidably connected to the support frame.

[0014] The effects achieved by the above components are: the sliding effect of the slide bar and the support frame is achieved.

[0015] Preferably, one side of the support plate is fixedly connected to a support vertical plate, one side of the support vertical plate is slidably connected to a movable plate, and one side of the two movable plates is fixedly connected to the support frame.

[0016] The effect achieved by the above components is that the movement of the support frame drives the moving plate and the supporting vertical plate to slide.

[0017] Preferably, a plurality of fixing holes are opened on one side of the movable plate, and the plurality of fixing holes are evenly distributed on the movable plate.

[0018] The effect achieved by the above components is: the effect of the fixed hole being opened on the movable plate is achieved.

[0019] Preferably, a clamping rod is slidably connected inside the fixing hole, and a pull plate is fixedly connected to one end of the clamping rod.

[0020] The effect achieved by the above components is that when the pull plate moves, it can drive the clamping rod to move in a direction away from or close to the fixing hole.

[0021] Preferably, the arc surface of the clamping rod is sleeved with a spring, and two ends of the spring are fixedly connected to the supporting vertical plate and the pulling plate respectively.

[0022] The effect achieved by the above components is that when the pull plate moves, the spring is stretched and the clamping rod is moved.

[0023] In summary, the beneficial effects of the utility model are:

[0024] In the utility model, when it is necessary to demonstrate different lever lengths, the threaded rod rotates to drive the internal threaded sleeve rod to move in directions away from or close to each other to adjust the length. The rotating device solves the problem of traditional physics teaching lever principle demonstration devices, in which the lever arm length is fixed and the lever needs to be repeatedly replaced when demonstrating levers of different lengths, resulting in a long time spent.

[0025] In the utility model, when the height of the support frame needs to be adjusted to improve the viewing experience of students in the back row during teaching, the distance between the support frame and the base plate is adjusted, and the adjusted support frame is fixed through the adaptation between the clamping rod and the fixing hole. The fixing device solves the problem of height fixation of the traditional physics teaching lever principle demonstration device, thereby making it more convenient for students at a distance to watch and improving the practicality of the demonstration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0027] Figure 2 It is a structural schematic diagram of the rotating structure of the utility model;

[0028] Figure 3 It is a partial structural schematic diagram of the rotating structure of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the fixed structure of the utility model.

[0030] Legend: 1. Base plate; 2. Rotating device; 201. L-shaped plate; 202. Servomotor; 203. Active bevel gear; 204. Driven bevel gear; 205. Rotating shaft; 206. Threaded rod; 207. Rotating ring; 208. Fixed L plate; 209. Fixed ring; 210. Fixed rod; 211. Internally threaded sleeve rod; 212. First scale; 213. Second scale; 214. Connecting plate; 215. Hook; 216. Limit rod; 217. U-shaped guide plate; 218. Fixed plate; 3. Fixing device; 31. Support plate; 32. Support vertical plate; 33. Moving plate; 34. Fixing hole; 35. Clamping rod; 36. Spring; 37. Pull plate; 38. Connecting vertical plate; 39. Slide bar; 4. Support frame. DETAILED DESCRIPTION

[0031] Reference Figure 1 As shown, the utility model provides a technical solution: a physics teaching lever principle demonstration device, comprising a base plate 1 and a support frame 4, a rotating device 2 is provided on one side of the support frame 4, and a fixing device 3 is provided on the top of the base plate 1.

[0032] The specific configuration and functions of the rotating device 2 and the fixing device 3 are described in detail below.

[0033] Reference Figure 2 and Figure 3As shown, in this embodiment: the rotating device 2 includes an L-shaped plate 201, the short arm end of the L-shaped plate 201 is fixedly connected to a servo motor 202, the output end of the servo motor 202 is fixedly connected to an active bevel gear 203, the outer portion of the active bevel gear 203 is meshed with a driven bevel gear 204, the inner portion of the driven bevel gear 204 is fixedly connected to a rotating shaft 205, both ends of the rotating shaft 205 are fixedly connected to a threaded rod 206, the arc surface of the threaded rod 206 is threadedly connected to an internally threaded sleeve rod 211, one side of the internally threaded sleeve rod 211 is slidably connected to a first scale 212, and one side of the first scale 212 is fixedly connected to a rotating shaft 205. Ring 207, the arc surface of the rotating ring 207 is fixedly connected with a fixed L-plate 208, one end of the fixed L-plate 208 is fixedly connected to the L-shaped plate 201, one side of the first scale 212 is fixedly connected with a fixed ring 209, the interior of the fixed ring 209 is rotatably connected with a fixed rod 210, one end of the fixed rod 210 is fixedly connected to the support frame 4, one side of the first scale 212 is slidably connected with two second scales 213, one end of the second scale 213 is fixedly connected with a connecting plate 214, one side of the connecting plate 214 is fixedly connected with an internally threaded sleeve rod 211, and one end of the internally threaded sleeve rod 211 is fixedly connected with a hook 215. The servo motor 202 is started to drive the active bevel gear 203 to rotate, the active bevel gear 203 rotates to drive the meshing driven bevel gear 204 to rotate, the driven bevel gear 204 rotates to drive the rotating shaft 205 to rotate, the rotating shaft 205 rotates to drive the threaded rod 206 to rotate, the threaded rod 206 rotates to drive the position of the internal threaded sleeve 211 on the threaded rod 206 to adjust, the internal threaded sleeve 211 moves to drive the connecting plate 214 to move, so that the second scale 213 moves on the first scale 212. One side of the L-shaped plate 201 is fixedly connected to the limit rod 216, and the arc surface of the limit rod 216 is slidably connected to the U-shaped guide plate 217. The L-shaped plate 201 moves to drive the limit rod 216 to slide inside the U-shaped guide plate 217. One side of the U-shaped guide plate 217 is fixedly connected to a fixed plate 218, and one end of the fixed plate 218 is fixedly connected to the support frame 4. The fixing plate 218 and the support frame 4 are fixed, and the U-shaped guide plate 217 is fixed.

[0034] Reference Figure 4As shown, in this embodiment: the fixing device 3 includes two support plates 31, one side of the two support plates 31 is fixedly connected to the bottom plate 1, and one side of the support plate 31 is fixedly connected to a connecting vertical plate 38. One side of the connecting vertical plate 38 is fixedly connected to a slide bar 39, and the arc surface of the two slide bars 39 is slidably connected to the support frame 4. The effect of the slide bar 39 and the support frame 4 sliding is achieved. One side of the support plate 31 is fixedly connected to a supporting vertical plate 32, and one side of the supporting vertical plate 32 is slidably connected to a moving plate 33, and one side of the two moving plates 33 is fixedly connected to the support frame 4. The effect of the moving of the support frame 4 driving the moving plate 33 and the supporting vertical plate 32 to slide is achieved. One side of the moving plate 33 is provided with a plurality of fixing holes 34, and the plurality of fixing holes 34 are evenly distributed on the moving plate 33. The effect of the fixing holes 34 being opened on the moving plate 33 is achieved. The interior of the fixing hole 34 is slidably connected to a clamping rod 35, and one end of the clamping rod 35 is fixedly connected to a pull plate 37. When the pull plate 37 moves, it can drive the clamping rod 35 to move away from or close to the fixing hole 34. The arc surface of the clamping rod 35 is covered with a spring 36, and the two ends of the spring 36 are respectively fixedly connected to the supporting vertical plate 32 and the pull plate 37. The movement of the pull plate 37 drives the spring 36 to stretch and the clamping rod 35 to move.

[0035] Working principle: through the rotating device 2, when it is necessary to demonstrate different lever lengths, the operator first starts the servo motor 202 to drive the active bevel gear 203 to rotate, the active bevel gear 203 rotates to drive the meshing driven bevel gear 204 to rotate, the driven bevel gear 204 rotates to drive the rotating shaft 205 to rotate, the rotating shaft 205 rotates to drive the threaded rod 206 to rotate, the threaded rod 206 rotates to drive the position of the internal threaded sleeve 211 on the threaded rod 206 to adjust the direction of the internal threaded sleeve 211 to move away from or close to each other, the movement of the internal threaded sleeve 211 drives the connecting plate 214 and the hook 215 to move, so that the second scale 213 moves on the first scale 212 to adjust the distance between them. Through the rotating device 2, the problem of the traditional physics teaching lever principle demonstration device is solved. The lever arm length is fixed and the length cannot be adjusted. When demonstrating levers of different lengths, the lever needs to be repeatedly replaced, which takes a long time and causes a waste of learning time.

[0036] Through the fixing device 3, when it is necessary to adjust the height of the support frame 4 so as to improve the viewing experience of the students in the back row during the teaching process, the operator first pulls the pull plate 37 in the direction away from the support vertical plate 32. The pull plate 37 is subjected to the tension to drive the clamping rod 35 to move and the spring 36 to stretch. When the clamping rod 35 is completely away from the fixing hole 34 opened on the movable plate 33, the support frame 4 is moved to adjust the distance between the support frame 4 and the bottom plate 1. When the support frame 4 moves to the required height, the pulled pull plate 37 is released. At this time, the spring 36 contracts and drives the pull plate 37 to move, so that the clamping rod 35 moves in the direction close to the fixing hole 34 until it is completely moved into the inside of the clamping rod 35, so that the height of the support frame 4 is fixed. Through the fixing device 3, the problem of the traditional physics teaching lever principle demonstration device with a fixed height, which reduces the viewing experience of students who are far away from the physics teaching lever demonstration device, is solved.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

Claims

1. A physics teaching lever principle demonstration device, comprising a base plate (1) and a support frame (4), characterized in that: A rotating device (2) is provided on one side of the support frame (4), and the rotating device (2) comprises an L-shaped plate (201), a short arm end of the L-shaped plate (201) is fixedly connected to a servo motor (202), an output end of the servo motor (202) is fixedly connected to an active bevel gear (203), the outside of the active bevel gear (203) is meshed with a driven bevel gear (204), the inside of the driven bevel gear (204) is fixedly connected to a rotating shaft (205), both ends of the rotating shaft (205) are fixedly connected to a threaded rod (206), the arc surface of the threaded rod (206) is threadedly connected to an internally threaded sleeve rod (211), one side of the internally threaded sleeve rod (211) is slidably connected to a first scale (212), and one side of the first scale (212) is fixedly connected to A rotating ring (207) is connected, the arc surface of the rotating ring (207) is fixedly connected to a fixed L-plate (208), one end of the fixed L-plate (208) is fixedly connected to the L-shaped plate (201), one side of the first scale (212) is fixedly connected to a fixed ring (209), the interior of the fixed ring (209) is rotatably connected to a fixed rod (210), one end of the fixed rod (210) is fixedly connected to the support frame (4), one side of the first scale (212) is slidably connected to two second scales (213), one end of the second scale (213) is fixedly connected to a connecting plate (214), one side of the connecting plate (214) is fixedly connected to an internally threaded sleeve rod (211), and one end of the internally threaded sleeve rod (211) is fixedly connected to a hook (215).

2. A physics teaching lever principle demonstration device according to claim 1, characterized in that: One side of the L-shaped plate (201) is fixedly connected to a limiting rod (216), and the arc surface of the limiting rod (216) is slidably connected to a U-shaped guide plate (217).

3. A physics teaching lever principle demonstration device according to claim 2, characterized in that: A fixing plate (218) is fixedly connected to one side of the U-shaped guide plate (217), and one end of the fixing plate (218) is fixedly connected to the support frame (4).

4. A physics teaching lever principle demonstration device according to claim 1, characterized in that: A fixing device (3) is provided at the top end of the bottom plate (1), and the fixing device (3) comprises two support plates (31), one side of the two support plates (31) is fixedly connected to the bottom plate (1), and one side of the support plates (31) is fixedly connected to a connecting vertical plate (38).

5. A physics teaching lever principle demonstration device according to claim 4, characterized in that: A sliding bar (39) is fixedly connected to one side of the connecting vertical plate (38), and the arc surfaces of the two sliding bars (39) are slidably connected to the support frame (4).

6. A physics teaching lever principle demonstration device according to claim 5, characterized in that: One side of the support plate (31) is fixedly connected to a support vertical plate (32), one side of the support vertical plate (32) is slidably connected to a movable plate (33), and one side of the two movable plates (33) is fixedly connected to a support frame (4).

7. A physics teaching lever principle demonstration device according to claim 6, characterized in that: A plurality of fixing holes (34) are provided on one side of the movable plate (33), and the plurality of fixing holes (34) are evenly distributed on the movable plate (33).

8. A physics teaching lever principle demonstration device according to claim 7, characterized in that: A clamping rod (35) is slidably connected inside the fixing hole (34), and a pull plate (37) is fixedly connected to one end of the clamping rod (35).

9. A physics teaching lever principle demonstration device according to claim 8, characterized in that: The arc surface of the clamping rod (35) is sleeved with a spring (36), and the two ends of the spring (36) are respectively fixedly connected to the supporting vertical plate (32) and the pulling plate (37).

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