Demonstration pulley for junior high school physics teaching

Abstract

The utility model relates to the technical field of physics teaching, in particular to a pulley for demonstration of physics teaching in junior high schools, which comprises a base, two upright posts are mounted on the base, the two upright posts are arranged left and right, and a round rod is connected between the tops of the two upright posts; the device further comprises two wheel carriers, rolling wheels are rotationally installed on the wheel carriers, recording assemblies are arranged on the two stand columns, and each recording assembly comprises a connecting frame. Through the arrangement of the recording assembly, a first pen and a third pen can respectively record the moving distance of a weight and the stretching distance of a pull rope on a first plate and a second plate during an experiment, so that a user can conveniently observe and record, the operation step of manually comparing gears is reduced, the efficiency is improved, and the recording precision is relatively high; and through the cooperation of the second pen and the third pen, the user can convert the tension value through the two tracks on the second plate, and the functionality of the recording assembly is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to physical teaching technical field, concretely is a demonstration pulley for junior high school physics teaching. BACKGROUND

[0002] The pulley is a small wheel with a groove on the periphery and can rotate around the shaft, which is composed of a disc with a groove that can rotate around the central shaft and a flexible cable that crosses the disc. The pulley block is a simple machine that can rotate around the central shaft, which is assembled by multiple movable pulleys and fixed pulleys. It can save labor and change the direction of force. The demonstration pulley for junior high school physics teaching is a demonstration device that demonstrates the principle of saving labor and changing the direction of force by using a pulley block during the process of middle school physics teaching.

[0003] Chinese patent CN217506756U discloses a "middle school physics pulley block experiment demonstration device", which includes a demonstration device body, a sliding column is arranged above the demonstration device body, a sliding block is arranged on the sliding column, a connecting shaft is arranged in front of the sliding block, a support rod is connected to the outer side of the connecting shaft, a spring is arranged on the left side of the support rod, and a pull rope is arranged on the right side of the support rod, and the pull rope is wound around the rotating shaft. The middle school physics pulley block experiment demonstration device is provided with a rotating shaft for adjusting the width of the device body according to the requirement to change the floor area, so as to adjust the floor area of the device, and the pulley block is provided with a simple disassembly and assembly clamping structure, which can clamp the pull rope in the movable pulley rope slot. Even if the pull rope is separated from the clamping slot, the movable pulley will not fall and be damaged.

[0004] However, in the actual use process of the prior art, the distance moved by the pulley block before and after is recorded manually, which is relatively cumbersome and has the problem of unstable recording accuracy. Therefore, a demonstration pulley for junior high school physics teaching is proposed to solve the above-mentioned problems. Utility model content

[0005] The utility model provides a demonstration pulley for junior high school physics teaching solves the problem of manual record of the distance of pulley group moving back and forth in the actual use process, and manual record is more complicated, and there is the problem of unstable record accuracy. In order to realize above -mentioned purpose, the utility model is realized through following technical scheme: a demonstration pulley for junior high school physics teaching, including base, two upright posts are installed on the base, two the upright post is set as left and right, and the top of two upright posts is connected with round bar, still including two wheel supports, the gyro wheel is rotatably installed on the wheel support, two the wheel support is set as left and right, the wheel support of left side hangs on the round bar, the top of the upright post of right side is connected with pull rope, the inner wall of the upright post of left side is connected with hole block, and the gyro wheel on the wheel support of right side is placed on the pull rope, record assembly is arranged on two upright posts, and the record assembly includes connecting frame, the connecting frame is installed on the wheel support of right side, the connecting frame is connected with slide bar, the inner wall of the slide block of the upright post of right side is slidably installed, the slide bar is slidably connected with the inner wall of slide block, a pen is installed on the slide block, a frame is installed on the upright post of right side, a plate is installed on the frame, the pen contacts with the plate, and the plate is provided with scale line.

[0006] Preferably, a guide wheel rod is slidably installed on the base, a guide wheel is arranged at the top of the guide wheel rod, and one section of the pull rope is in contact with the bottom of the guide wheel of the guide wheel rod.

[0007] Preferably, one section of the pull rope is placed on the gyro wheel of the left side, a circular hole is arranged in the hole block, and the end of the pull rope away from the upright post of the right side passes through the circular hole of the hole block.

[0008] Preferably, the end of the pull rope passing through the hole block is connected with a first block, the first block is connected with a second block through a spring, a second pen is connected to the second block, a third pen is connected to the first block, a second frame is connected to the upright post of the left side, and a second plate is installed on the second frame.

[0009] Preferably, the second pen and the third pen are arranged in an up-and-down staggered manner, the second pen and the third pen are in contact with the second plate, and the second plate is provided with two groups of scale lines.

[0010] Preferably, a cleaning assembly is arranged on the wheel support, the cleaning assembly includes two sliding frames, the sliding frames are slidably installed on the wheel support, the sliding frames are respectively located on both sides of the gyro wheel, slide shafts are respectively installed on both sides of the gyro wheel, mounting rods are respectively connected to both sides of the sliding frames, and brushes are installed on the mounting rods.

[0011] Preferably, the slide shafts are respectively in contact with the inner sides of the sliding frames when moving, and the brushes are in contact with the surface of the pull rope.

[0012] As can be seen from the above technical solutions, the demonstration pulley for junior high school physics teaching provided in the embodiments of this specification has at least the following beneficial effects:

[0013] (1) By setting up the recording component, this utility model enables the No. 1 pen and the No. 3 pen to record the distance of the weight movement and the distance of the rope stretching on the No. 1 and No. 2 plates respectively during the experiment, which is convenient for users to observe and record, reduces the operation steps of manually comparing gears, improves efficiency, and has high recording accuracy; by cooperating with the No. 2 pen and the No. 3 pen, users can calculate the pulling force value through the two tracks on the No. 2 plate, which increases the functionality of the recording component.

[0014] (2) By setting up the cleaning component, the four brushes clean the pull rope near the roller by moving back and forth when the roller is driven by the pull rope, keeping the pull rope clean and avoiding the increase of friction due to the accumulation of dust on the surface of the pull rope after long-term use, which would have a certain impact on the experimental data. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the recording component in this utility model;

[0018] Figure 3 This is a schematic diagram of the guide wheel rod in this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of plate number two in this utility model;

[0020] Figure 5 This is a schematic diagram of the cleaning component in this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the carriage in this utility model.

[0022] In the diagram: 1. Base; 2. Column; 3. Wheel frame; 4. Roller; 5. Round rod; 6. Recording component; 61. Connecting frame; 62. Slide rod; 63. Slider; 64. Pen No. 1; 65. Frame No. 1; 66. Plate No. 1; 67. Block No. 1; 68. Block No. 2; 69. Pen No. 2; 610. Pen No. 3; 611. Frame No. 2; 612. Plate No. 2; 7. Cleaning component; 71. Slide frame; 72. Slide shaft; 73. Mounting rod; 74. Brush; 8. Guide wheel rod; 9. Pull rope; 10. Hole block. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] Example 1

[0025] Please refer to Figures 1-4As shown, a demonstration pulley for junior high school physics teaching, including base 1, two columns 2 are installed on the base 1, two columns 2 are left and right, the top of two columns 2 is connected with round bar 5;It also includes two wheel frames 3, the roller 4 is rotatably installed on the wheel frame 3, two wheel frames 3 are left and right, the left wheel frame 3 is hung on the round bar 5, the right column 2 top is connected with the pull rope 9, the left column 2 inner wall is connected with the hole block 10, the roller 4 on the right wheel frame 3 is placed on the pull rope 9, the guide wheel rod 8 is slidably installed on the base 1, the top of the guide wheel rod 8 is provided with a guide wheel, one section of the pull rope 9 is in contact with the bottom of the guide wheel of the guide wheel rod 8, the guide wheel rod 8 and the hole block 10 guide the pull rope 9;Two columns 2 are provided with recording assembly 6, recording assembly 6 includes connecting frame 61, connecting frame 61 is installed on the right wheel frame 3, connecting frame 61 is connected with slide rod 62, the inner wall of the right column 2 is slidably installed with sliding block 63, the inner wall of the sliding block 63 is slidably connected with the slide rod 62, the sliding block 63 is installed with No. 1 pen 64, the right column 2 is installed with No. 1 frame 65, No. 1 frame 65 is installed with No. 1 plate 66, No. 1 pen 64 is in contact with No. 1 plate 66, No. 1 plate 66 is provided with scale line, when the right wheel frame 3 moves upward, the slide rod 62 is driven to slide upward on the right column 2 through the connecting frame 61, the slide rod 62 drives No. 1 pen 64 to move upward through the sliding block 63, No. 1 pen 64 records the motion trail on No. 1 plate 66 in the process of moving upward, the distance of the weight movement can be obtained by comparing the motion trail on No. 1 plate 66 with the scale line;One section of the pull rope 9 is placed on the left roller 4, the hole block 10 is provided with a circular hole, the end of the pull rope 9 away from the right column 2 passes through the circular hole of the hole block 10, the end of the pull rope 9 passing through the hole block 10 is connected with No. 1 block 67, No. 1 block 67 is connected with No. 2 block 68 through spring, No. 2 block 68 is provided with pull ring on one side, when No. 2 block 68 is pulled, No. 2 block 68 first stretches the spring, after the spring stops stretching, No. 2 block 68 pulls No. 1 block 67 left through the spring, No. 2 block 68 is connected with No. 2 pen 69, No. 1 block 67 is connected with No. 3 pen 610, the left column 2 is connected with No. 2 frame 611, No. 2 frame 611 is installed with No. 2 plate 612, No. 2 pen 69 and No. 3 pen 610 are arranged staggered up and down, No. 2 pen 69 and No. 3 pen 610 are in contact with No. 2 plate 612, No. 2 plate 612 is provided with two groups of scale lines, the movement of the pull rope 9 makes No. 2 block 68 first drive No. 2 pen 69 to record the motion trail on No. 2 plate 612, after No. 2 pen 69 moves a certain distance, which is the stretching distance of the spring, No. 1 block 67 drives No. 3 pen 610 to record the motion trail on No. 2 plate 612, the distance of the pull rope 9 movement can be obtained by comparing the group of scale lines close to No. 3 pen 610 on No. 2 plate 612.Since the distance between the first block 67 and the second block 68 is fixed, and the distance of the movement track generated by the first block 67 and the second block 68 is not the same due to the action of the spring, the difference between the two movement tracks minus the distance between the first block 67 and the second block 68 can obtain the extension amount of the spring, and the extension amount of the spring can be converted into the tension value.

[0026] In the experiment, the first pen 64 and the third pen 610 can record the distance of the weight movement and the distance of the rope 9 stretching on the first plate 66 and the second plate 612 respectively, which is convenient for the user to observe and record, reduces the manual operation steps of comparing the gear, improves the efficiency, and the recording precision is higher. Through the cooperation of the second pen 69 and the third pen 610, the user can convert the tension value through the two tracks on the second plate 612, which increases the functionality of the recording assembly 6.

[0027] Embodiment 2

[0028] Please refer to Figures 5-6 As shown in the figure, the wheel frame 3 is provided with a cleaning assembly 7, the cleaning assembly 7 includes two sliding frames 71, the two sliding frames 71 are slidingly installed on the wheel frame 3, the two sliding frames 71 are located on the two sides of the roller 4 respectively, the roller 4 is provided with a sliding shaft 72 on each side, the two sliding shafts 72 are in contact with the inner sides of the two sliding frames 71 respectively when moving, the brush 74 is in contact with the surface of the rope 9, the roller 4 drives the sliding shaft 72 to rotate when rotating, the sliding shaft 72 drives the sliding frame 71 to move back and forth when rotating, the sliding frame 71 drives the two brushes 74 to move back and forth through the two mounting rods 73, so that the four brushes 74 of the cleaning assembly 7 can clean the rope 9 by moving back and forth.

[0029] In the embodiment, when the roller 4 is driven by the rope 9, the four brushes 74 clean the rope 9 near the roller 4 by moving back and forth, which keeps the cleanliness of the rope 9, avoids the rope 9 from attaching too much dust on the surface after a long time of use, and increases the friction, which affects the experimental data.

[0030] The utility model discloses a demonstration pulley for junior high school physics teaching is in use, and the guide pulley 8 and hole block 10 guide the pull rope 9, after hanging the weight on the bottom of wheel support 3 right side, through the pull ring, pull the pull rope 9 to left, and wheel support 3 and gyro wheel 4 form a pulley, and two wheel supports 3, two gyro wheels 4 and pull rope 9 form a pulley block, when pulling pull rope 9, wheel support 3 right side moves up, and wheel support 3 right side drives slide bar 62 to slide up on the right side of stand 2 through connecting frame 61, and slide bar 62 drives no. 1 pen 64 to move up through sliding block 63, and no. 1 pen 64 moves up and records the motion trail on no. 1 board 66, when pulling no. 2 block 68, no. 2 block 68 first stretches the spring, and when the spring stops stretching, no. 2 block 68 pulls no. 1 block 67 left through the spring, and pull rope 9 moves, so that no. 2 block 68 first drives no. 2 pen 69 and records the motion trail on no. 2 board 612, and after no. 2 pen 69 moves a certain distance, that is the stretching distance of spring, no. 1 block 67 drives no. 3 pen 610 and records the motion trail on no. 2 board 612, and no. 1 board 66 can be detached from no. 1 frame 65, and no. 2 board 612 can be detached from no. 2 frame 611, which is convenient for the user to observe and clean, and the distance of the weight movement can be obtained by comparing the scale line on the motion trail on no. 1 board 66, and the distance of pull rope 9 movement can be obtained by comparing the scale line on no. 2 board 612 close to no. 3 pen 610, since the distance between no. 1 block 67 and no. 2 block 68 is fixed, and the motion trail distance produced by the two is not the same due to the effect of spring, the difference between the two motion trails minus the distance between no. 1 block 67 and no. 2 block 68, and the extension amount of spring can be obtained, and the extension amount of spring can be converted into the tension value, through the setting of recording assembly 6, no. 1 pen 64 and no. 3 pen 610 can record the distance of the weight movement and the distance of the pull rope 9 stretching on no. 1 board 66 and no. 2 board 612 respectively during the experiment, which is convenient for the user to observe and record, reduces the manual comparison gear operation steps, improves the efficiency, and the recording precision is higher, through the cooperation of no. 2 pen 69 and no. 3 pen 610, the user can convert the tension value through the two trails on no. 2 board 612, which increases the functionality of recording assembly 6.

[0031] When the pull rope 9 is pulled, the roller 4 in contact with the pull rope 9 is driven to rotate, the roller 4 drives the sliding shaft 72 to rotate, the sliding shaft 72 drives the sliding frame 71 to reciprocate left and right, the sliding frame 71 drives the two brushes 74 to reciprocate left and right through the two mounting rods 73, so that the four brushes 74 of the cleaning assembly 7 can clean the pull rope 9 through reciprocating movement, the brush 74 is lightweight, the friction between the brush 74 and the pull rope 9 is extremely small, and the influence on the experimental data is extremely small, through the setting of the cleaning assembly 7, when the roller 4 is driven by the pull rope 9, the four brushes 74 clean the pull rope 9 near the roller 4 through reciprocating movement, the cleanliness of the pull rope 9 is maintained, and the surface of the pull rope 9 is prevented from being attached with much dust after long-time use, so that the friction is increased, and the experimental data is affected to a certain extent.

[0032] The above embodiments are only used for describing the embodiments of the present application, and are not intended to limit the embodiments of the present application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions belong to the scope of the embodiments of the present application, and the patent protection scope of the embodiments of the present application should be defined by the claims.

Claims

1. A demonstration pulley for junior high school physics teaching, comprising a base (1), characterized in that: Two columns (2) are installed on the base (1), and the two columns (2) are arranged left and right, and a round rod (5) is connected between the top of the two columns (2); Two wheel frames (3) are further included, the wheel frames (3) are rotatably installed with rollers (4), and the two wheel frames (3) are arranged left and right, the left wheel frame (3) is hung on the round rod (5), the top of the right column (2) is connected with a pull rope (9), the inner wall of the left column (2) is connected with a hole block (10), and the roller (4) on the right wheel frame (3) is placed on the pull rope (9). Recording assemblies (6) are arranged on the two columns (2), the recording assemblies (6) include connecting frames (61), the connecting frames (61) are installed on the right wheel frame (3), the connecting frames (61) are connected with sliding rods (62), the inner wall of the right column (2) is slidably installed with sliding blocks (63), the sliding rods (62) are slidably connected with the inner wall of the sliding blocks (63), the sliding blocks (63) are installed with first pens (64), the right column (2) is installed with a first rack (65), the first rack (65) is installed with a first plate (66), the first pens (64) are in contact with the first plate (66), and the first plate (66) is provided with scale lines.

2. The demonstration pulley for junior high school physics teaching according to claim 1, characterized in that: The base (1) is slidably installed with a guide wheel rod (8), the top of the guide wheel rod (8) is provided with a guide wheel, and one section of the pull rope (9) is in contact with the bottom of the guide wheel of the guide wheel rod (8).

3. The demonstration pulley for junior high school physics teaching according to claim 2, characterized in that: One section of the pull rope (9) is placed on the roller (4) on the left side, the hole block (10) is provided with a circular hole, and the end of the pull rope (9) away from the right column (2) penetrates through the circular hole of the hole block (10).

4. The demonstration pulley for junior high school physics teaching according to claim 3, characterized in that: The end of the pull rope (9) penetrating through the hole block (10) is connected with a first block (67), the first block (67) is connected with a second block (68) through a spring, the second block (68) is connected with a second pen (69), the first block (67) is connected with a third pen (610), the left column (2) is connected with a second rack (611), and the second rack (611) is installed with a second plate (612).

5. The demonstration pulley for junior high school physics teaching according to claim 4, characterized in that: The second pen (69) and the third pen (610) are arranged in an up-down staggered manner, the second pen (69) and the third pen (610) are in contact with the second plate (612), and the second plate (612) is provided with two groups of scale lines.

6. The demonstration pulley for junior high school physics teaching according to claim 5, characterized in that: The wheel frame (3) is provided with a cleaning assembly (7), the cleaning assembly (7) includes two sliding frames (71), the two sliding frames (71) are slidably installed on the wheel frame (3), and the two sliding frames (71) are respectively located on the two sides of the roller (4).

7. The demonstration pulley for junior high school physics teaching according to claim 6, characterized in that: The two sliding shafts (72) are in contact with the inner sides of the two sliding frames (71) when moving, and the brush (74) is in contact with the surface of the pull rope (9).

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