Friction force demonstration teaching aid for physical experiment

Abstract

The utility model discloses a friction force demonstration teaching aid for a physical experiment, which comprises a display board, four corners of the bottom end of the display board are fixedly provided with supporting columns, the bottom ends of the four supporting columns are fixedly connected with four corners of the top end of a bottom plate respectively, one side of the top end of the bottom plate is hinged with the bottom end of an adjusting screw sleeve through a connecting hinge, and the other side of the top end of the bottom plate is hinged with the bottom end of the adjusting screw sleeve. The rotating plate connected through the rotating shaft is connected with the movable clamping block, the clamping plate connected with the friction plate is provided with a clamping hole corresponding to the movable clamping block, the rotating plate is hinged to the bearing seat through the connecting hinge, the friction plate is connected with the bearing seat through the connecting hinge, and the rotating plate is connected with the movable clamping block through the connecting hinge. A limiting bearing in the bearing seat is in threaded connection with an adjusting stud connected with an adjusting screw sleeve, so that the friction force demonstration teaching aid has an adjusting function, personnel can replace different friction plates according to requirements, namely, the experiment contact surface can be changed, meanwhile, the rotating plate can be adjusted to rotate, then the inclination angle of the friction plate is changed, and it is guaranteed that a teacher conducts adjusting operation; and a better demonstration effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of demonstration teaching aids, in particular to a friction force demonstration teaching aid used in physical experiments. Background Art

[0002] The force that hinders the relative motion or relative motion trend of objects on the contact surface is called friction. The direction of friction is opposite to the direction of the relative motion or relative motion trend of the objects. In physics teaching experiments, teachers need to use friction demonstration teaching aids to demonstrate friction to students.

[0003] However, the existing friction demonstration teaching aids do not have an adjustment function. Friction is affected by different contact surfaces and tilt angles. Without an adjustment function, personnel cannot replace the contact surface according to needs, and the tilt angle cannot be adjusted, which makes it inconvenient for teachers to use and affects teaching demonstrations. At the same time, the existing friction demonstration teaching aids are not easy to measure. When using the teaching aids for teaching, the friction must be calculated based on relevant data, which is inconvenient to measure and affects personnel's use. Utility Model Content

[0004] The purpose of the utility model is to provide a friction force demonstration teaching aid for physical experiments to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a friction force demonstration teaching aid for physical experiments, comprising a display board, wherein support columns are fixedly provided at the four corners of the bottom end of the display board, the bottom ends of the four support columns are fixedly connected to the four corners of the top end of the base plate, one side of the top end of the base plate is hinged to the bottom end of the adjusting screw sleeve by a connecting hinge, the inner wall of the adjusting screw sleeve is threadedly connected to the bottom of the outer wall of the adjusting stud, a turning handle is fixedly provided at the middle of the outer wall of the adjusting stud, and the top of the outer wall of the adjusting stud is fixedly connected to the inner ring of the limit bearing. The outer ring of the limit bearing is fixedly connected to the inner wall of the bearing seat, and the top of the bearing seat is hinged to one side of the bottom end of the rotating plate through a connecting hinge. A card slot is opened at both ends of both sides of the rotating plate, and the top of each inner wall of the card slot is hinged with a movable card block through a movable hinge. One end of a return spring provided at one end of each movable card block is fixedly connected to one side of the inner wall of the corresponding card slot, and the outer wall of each movable card block is interlaced with the card hole opened in the middle of one side of the corresponding card plate, and the tops of the four card plates are fixedly connected to the four corners of the bottom end of the friction plate respectively.

[0006] Preferably, a movable hole is opened on one side of the bottom end of the display board, and two supporting ears are fixedly provided on one side of the top end of the display board. A connecting bearing is embedded on one side of each supporting ear, and the inner rings of the two connecting bearings are respectively fixedly connected to the two sides of the outer wall of the rotating shaft, and the middle part of the outer wall of the rotating shaft is fixedly connected to one end of the rotating plate. A trapezoidal placement box is fixedly provided at a corner of the top end of the display board.

[0007] Preferably, a connecting plate is inserted into one end of the rotating shaft, the bottom end of the connecting plate is fixedly connected to the middle part of the top of the display board, one end of the connecting plate is fixed with a fan-shaped plate, the surface of the fan-shaped plate is engraved with an angle mark, and one end of one side of the rotating shaft is fixed with an angle indicator rod.

[0008] Preferably, a vertical ruler is fixedly provided on the other side of the top of the display board, a movable sleeve is inserted into the middle of the outer wall of the vertical ruler, and one side of the movable sleeve is fixedly connected to one end of the vertical calibration rod.

[0009] Preferably, connecting angle rods are fixedly provided at the two corners on one side of the rotating plate, and the top ends of the two connecting angle rods are fixedly connected to the two sides of the bottom end of the transverse scale plate respectively.

[0010] Preferably, a slider is slidably connected in a slide groove opened on one side of the transverse scale plate, one end of the slider is fixedly connected to one end of the movable block, and a rotating hole opened in the middle of the top of the movable block is interlaced with the bottom of the outer wall of the transverse calibration frame.

[0011] The technical effects and advantages of this utility model are:

[0012] (1) The rotating plate connected by the rotating shaft is connected to the movable clamping block, the clamping plate connected to the friction plate is provided with a clamping hole corresponding to the movable clamping block, the rotating plate is hinged to the bearing seat through a connecting hinge, and the limit bearing in the bearing seat is threadedly connected to the adjusting stud connected to the adjusting screw sleeve, so that the friction force demonstration teaching aid has an adjustment function. The personnel can replace different friction plates according to the needs, thereby changing the experimental contact surface, and at the same time, the rotating plate can be adjusted to rotate, thereby changing the inclination angle of the friction plate, ensuring that the teacher can perform the adjustment operation and having a better demonstration effect;

[0013] (2) The rotating shaft is connected to the connecting plate through an interlaced connection. The rotating shaft is connected to an angle indicating rod, the movable sleeve connected to the vertical scale plate is connected to a vertical calibration rod, and the movable block connected to the horizontal scale plate is connected to a horizontal calibration frame. This can make the friction demonstration teaching aid more convenient when measuring. When conducting a friction experiment, it can ensure that the data such as the inclination angle of the inclined plane, the height of the experimental object and the length of the inclined plane are measured, thereby ensuring the calculation of the friction force and making it more convenient for personnel to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the local structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the connection structure of the display board of the utility model;

[0017] Figure 4 It is a structural diagram of the adjustment mechanism of the utility model.

[0018] In the figure: 1. display board; 2. support column; 3. bottom plate; 4. trapezoidal placement box; 5. support ear; 6. rotating shaft; 7. connecting plate; 8. angle indicator rod; 9. sector plate; 10. rotating plate; 11. friction plate; 12. clamping plate; 13. horizontal scale plate; 14. movable block; 15. horizontal calibration frame; 16. vertical scale plate; 17. movable sleeve; 18. vertical calibration rod; 19. movable clamping block; 20. connecting hinge; 21. bearing seat; 22. adjusting stud; 23. turning handle; 24. adjusting screw sleeve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The utility model provides Figure 1-Figure 4The friction force demonstration teaching aid for physical experiments shown in the figure comprises a display board 1, wherein support columns 2 are fixedly provided at the four corners of the bottom end of the display board 1, and the bottom ends of the four support columns 2 are fixedly connected to the four corners of the top end of the base plate 3 respectively, and one side of the top end of the base plate 3 is hinged to the bottom end of the adjusting screw sleeve 24 through a connecting hinge 20, and the inner wall of the adjusting screw sleeve 24 is threadedly connected to the bottom of the outer wall of the adjusting stud 22, and a turning handle 23 is fixedly provided at the middle part of the outer wall of the adjusting stud 22, and the top of the outer wall of the adjusting stud 22 is fixedly connected to the inner ring of the limit bearing, and the outer ring of the limit bearing is fixedly connected to the inner wall of the bearing seat 21, and the top end of the bearing seat 21 is hinged to one side of the bottom end of the rotating plate 10 through the connecting hinge 20, and both ends of the two sides of the rotating plate 10 are provided with a card slot, and each card slot is fixedly provided with a turning handle 23. The top of the inner wall of the groove is hinged with a movable block 19 through a movable hinge, and one end of a return spring provided at one end of each movable block 19 is fixedly connected to one side of the inner wall of the corresponding slot, and the outer wall of each movable block 19 is interlaced with the card hole opened in the middle of one side of the corresponding card plate 12. The top of the four card plates 12 are respectively fixedly connected to the four corners of the bottom end of the friction plate 11, and a movable hole is opened on one side of the bottom end of the display board 1. Two supporting ears 5 are fixedly provided on one side of the top of the display board 1, and a connecting bearing is embedded on one side of each supporting ear 5. The inner rings of the two connecting bearings are respectively fixedly connected to the two sides of the outer wall of the rotating shaft 6, and the middle part of the outer wall of the rotating shaft 6 is fixedly connected to one end of the rotating plate 10. A trapezoidal placement box 4 is fixedly provided at a corner of the top of the display board 1;

[0021] like Figure 1-Figure 2 As shown, a connecting plate 7 is inserted into one end of the rotating shaft 6, and the bottom end of the connecting plate 7 is fixedly connected to the middle part of the top of the display board 1. A fan-shaped plate 9 is fixed to one end of the connecting plate 7, and an angle mark is engraved on the surface of the fan-shaped plate 9. An angle indicating rod 8 is fixed to one end of one side of the rotating shaft 6, and a vertical scale plate 16 is fixed to the other side of the top of the display board 1. A movable sleeve 17 is inserted into the middle of the outer wall of the vertical scale plate 16, and one side of the movable sleeve 17 is fixedly connected to one end of the vertical calibration rod 18. Connecting angle rods are fixed at the two corners on one side of the rotating plate 10, and the tops of the two connecting angle rods are respectively fixedly connected to the two sides of the bottom end of the horizontal scale plate 13. A slider is slidably connected in the sliding groove opened on one side of the horizontal scale plate 13, and one end of the slider is fixedly connected to one end of the movable block 14. The rotating hole opened in the middle of the top of the movable block 14 is inserted into the bottom of the outer wall of the horizontal calibration frame 15.

[0022] The working principle of the utility model is as follows: when using the teaching aid, personnel can replace the friction plate 11 according to needs. The card plate 12 connected to the friction plate 11 is provided with a card hole, and the card hole is connected with the movable card block 19. The card slot provided on the rotating plate 10 is hinged with the movable card block 19 through a movable hinge. The movable card block 19 is connected with a reset spring, which can ensure the replacement of the friction plate 11 and adjust the inclination angle of the rotating plate 10 at the same time. The personnel rotates the turning handle 23 connected to the adjusting stud 22, and the adjusting stud 22 rotates in the limit bearing in the bearing seat 21. At the same time, the adjusting stud 22 rotates in the adjusting screw sleeve 24, which can change the length formed by the adjusting stud 22 and the adjusting screw sleeve 24. The adjusting screw sleeve 24 is hinged to the base plate 3 through the connecting hinge 20, and the bearing seat 21 is hinged to the rotating plate 10 through the connecting hinge 20, which can support the rotating plate 10 to rotate. The rotating shaft 6 connected to the rotating plate 10 rotates in the connecting bearing in the supporting ear 5 to ensure the change of the angle. When the rotating shaft 6 rotates, the rotating shaft 6 rotates in the connecting plate 7, and the rotating shaft 6 drives the angle indicating rod 8 to rotate. The connecting plate 7 is connected to the fan-shaped plate 9. The tilt angle can be observed by cooperating with the angle indicating rod 8 and the fan-shaped plate 9. At the same time, the personnel can move the movable sleeve 17 on the vertical scale plate 16, and the movable sleeve 17 is connected to the vertical calibration rod 18 to measure the height of the experimental object. The connecting angle rod connected to the rotating plate 10 is connected to the horizontal scale plate 13, and the horizontal scale plate 13 can rotate with the rotating plate 10. The personnel can move the movable block 14, and the slider connected to the movable block 14 slides in the slide groove opened on the horizontal scale plate 13. When the experimental object moves on the friction plate 11, the personnel can point to the initial point of the object movement in sequence through the upper part of the horizontal calibration frame 15, and the moving distance of the object on the friction plate 11 can be calculated through the bottom of the horizontal calibration frame 15.

[0023] In the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can all be customized according to the description and the drawings.

[0025] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A friction force demonstration teaching aid for physical experiments, comprising a display board (1), characterized in that: The four corners at the bottom of the display board (1) are fixed with support columns (2), and the bottom ends of the four support columns (2) are fixedly connected to the four corners at the top of the bottom plate (3). One side of the top of the bottom plate (3) is hinged to the bottom end of the adjusting screw sleeve (24) through a connecting hinge (20). The inner wall of the adjusting screw sleeve (24) is threadedly connected to the bottom of the outer wall of the adjusting stud (22). A turning handle (23) is fixedly provided in the middle of the outer wall of the adjusting stud (22). The top of the outer wall of the adjusting stud (22) is fixedly connected to the inner ring of the limit bearing, and the outer ring of the limit bearing is fixedly connected to the inner wall of the bearing seat (21). The top of the bearing seat (21) is hinged to one side of the bottom end of the rotating plate (10) through a connecting hinge (20), and both ends of the two sides of the rotating plate (10) are provided with a card slot, and the top of the inner wall of each card slot is hinged to a movable card block (19) through a movable hinge, and one end of a return spring provided at one end of each movable card block (19) is fixedly connected to one side of the inner wall of the corresponding card slot, and the outer wall of each movable card block (19) is interlaced with the card hole opened in the middle of one side of the corresponding card plate (12), and the tops of the four card plates (12) are fixedly connected to the four corners of the bottom end of the friction plate (11).

2. A friction force demonstration teaching aid for physical experiments according to claim 1, characterized in that: A movable hole is provided on one side of the bottom end of the display board (1), and two supporting ears (5) are fixedly provided on one side of the top end of the display board (1). A connecting bearing is embedded on one side of each supporting ear (5), and the inner rings of the two connecting bearings are fixedly connected to the two sides of the outer wall of the rotating shaft (6), respectively. The middle part of the outer wall of the rotating shaft (6) is fixedly connected to one end of the rotating plate (10), and a trapezoidal placement box (4) is fixedly provided at a corner of the top end of the display board (1).

3. A friction force demonstration teaching aid for physical experiments according to claim 2, characterized in that: A connecting plate (7) is inserted through one end of the rotating shaft (6), the bottom end of the connecting plate (7) is fixedly connected to the middle of the top end of the display board (1), one end of the connecting plate (7) is fixedly provided with a fan-shaped plate (9), the surface of the fan-shaped plate (9) is engraved with an angle mark, and one end of one side of the rotating shaft (6) is fixedly provided with an angle indicating rod (8).

4. A friction force demonstration teaching aid for physics experiments according to claim 3, characterized in that: A vertical ruler (16) is fixedly provided on the other side of the top of the display board (1), a movable sleeve (17) is inserted into the middle of the outer wall of the vertical ruler (16), and one side of the movable sleeve (17) is fixedly connected to one end of a vertical calibration rod (18).

5. The friction force demonstration teaching aid for physics experiments according to claim 1, characterized in that: Connecting angle rods are fixedly provided at two corners on one side of the rotating plate (10), and the top ends of the two connecting angle rods are fixedly connected to the two sides of the bottom end of the transverse ruler plate (13) respectively.

6. A friction force demonstration teaching aid for physical experiments according to claim 5, characterized in that: A slider is slidably connected in a sliding groove opened on one side of the transverse ruler (13), one end of the slider is fixedly connected to one end of the movable block (14), and a rotating hole opened in the middle of the top of the movable block (14) is interlaced and connected with the bottom of the outer wall of the transverse calibration frame (15).

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