CN213042512U

CN213042512U - High school physics frictional force presentation device

Info

Publication number: CN213042512U
Application number: CN202022499349.8U
Authority: CN
Inventors: 李龙新
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2021-04-23
Anticipated expiration: 2030-11-02

Abstract

The utility model discloses a high school physics frictional force presentation device belongs to experimental device technical field, the on-line screen storage device comprises a base, the tensiometer, clutch blocks and dead lever, the pole wall connection of supporting mechanism and dead lever is passed through in the upper end left side of base, the equal fixedly connected with fixed plate in both ends of dead lever, the one end that the dead lever was kept away from to two fixed plates is passed through the rotation axis and is connected with the upper end rotation of base, the upper end of base is equipped with first roller and second roller, first roller and second roller are common around having the drive belt, the both ends of first roller and second roller are all with axle center fixedly connected with pivot, and the one end of pivot is passed through antifriction bearing and is connected with the lateral wall rotation of fixed. The utility model discloses, can make things convenient for the mr to demonstrate multiple physics frictional force on presentation device and teach, improved presentation device's application scope to need not the motion state of the manual demonstration clutch blocks of mr, improved the efficiency of demonstration teaching.

Description

High school physics frictional force presentation device

Technical Field

The utility model relates to an experimental device technical field especially relates to a high school physics frictional force presentation device.

Background

When two objects, which are in contact with each other and pressed against each other, move or have a tendency to move relative to each other, a force is generated on the contact surfaces that counteracts the relative movement or the tendency to move relative to each other, which force is called a friction force. The direction of the friction force is opposite to the direction of the relative motion or relative motion trend of an object, in real life, the friction force between solid surfaces is divided into sliding friction, rolling friction, static friction and rolling friction, in the high school physics discipline, the sliding friction, the rolling friction, the static friction and the rolling friction are one of important teaching contents of discipline units, but because the friction force is relatively abstract, a physical model is required to be used for demonstration teaching during teaching, so that students can quickly and definitely know the friction force change process.

At present, when physical teaching, the frictional force presentation device pertinence that the teaching was used is stronger, by the motion state of mr manual operation control clutch blocks when the demonstration, just can read the vertical change of dynamometer, and whole demonstration process duration is shorter, needs the multiple operation demonstration to be able detailed teaching when necessary, and the mr of being not convenient for uses when the demonstration.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the motion state by mr manual operation control clutch blocks when demonstrating among the prior art, just can read the vertical change of dynamometer, whole demonstration process duration is shorter, needs the multiple operation demonstration when necessary and just can detailed teaching, the problem that the mr of being not convenient for used when the demonstration, and the high school physics frictional force presentation device that provides.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a high school physics friction force demonstration device, which comprises a base, a tension meter, a friction block and a fixed rod, the left side of the upper end of the base is connected with the rod wall of the fixed rod through a supporting mechanism, the two ends of the fixed rod are both fixedly connected with fixed plates, one ends of the two fixed plates far away from the fixed rod are rotatably connected with the upper end of the base through a rotating shaft, the upper end of the base is provided with a first roller and a second roller, the first roller and the second roller are jointly wound and connected with a transmission belt, both ends of the first roller and the second roller are coaxially and fixedly connected with a rotating shaft, one end of the rotating shaft is rotationally connected with the side wall of the fixed plate through a rolling bearing, one side of the fixed plate is fixedly connected with a motor, the output of motor passes antifriction bearing and with the one end of pivot with axle center fixed connection, the upper end fixedly connected with mounting panel of dead lever, one side of mounting panel is equipped with measuring mechanism.

Preferably, the measuring mechanism comprises two supporting plates fixed on the mounting plate, the tension meter is fixedly connected with one of the two supporting plates, the upper end of the supporting plate is fixedly connected with the measuring rod, one end of the measuring rod of the tension meter is fixedly connected with a connecting rope, one end of the connecting rope is fixedly connected with a rectangular rod, one end of the rectangular rod is fixedly connected with a connecting frame, one end of the connecting frame is rotatably connected with the center of the friction block through a sealing bearing, and the friction block is slidably connected with the upper end of the driving belt.

Preferably, the upper end of base is equipped with the diaphragm, the both ends of diaphragm respectively with two fixed plate relative one side fixed connection, two baffles of the upper end fixedly connected with of diaphragm, two the common fixedly connected with portal frame in upper end of baffle, the crossbeam center department of portal frame has cup jointed the locating lever of rectangle structure through the square hole slip, the board is placed to the upper end fixedly connected with of locating lever, the lower extreme of locating lever passes the square hole and has transversely seted up the rectangle through-hole, there is positioning bolt crossbeam one side of portal frame through first screw hole threaded connection.

Preferably, the supporting mechanism includes the bracing piece of vertical setting, the sliding sleeve has been cup jointed in the slip on the pole wall of bracing piece, there is the bolt one side of sliding sleeve through second screw hole threaded connection, fixedly connected with connecting block on the pole wall of dead lever, the both sides that the sliding sleeve is relative all rotate with the connecting block through the pin and are connected, the lower extreme of bracing piece is passed through the connecting axle and is connected with the upper end rotation of base.

Preferably, one side of the connecting frame is in threaded connection with a limiting bolt through a third threaded hole, and one end of the limiting bolt penetrates through the third threaded hole and is in sliding connection with the upper side of the friction block.

Compared with the prior art, the utility model provides a high school physics frictional force presentation device possesses following beneficial effect:

1. this high school physics frictional force presentation device, through the motor that is equipped with, the starter motor drives the pivot and makes the second roller rotatory, the rotatory drive belt of second roller makes first roller rotatory, and then can utilize the frictional force of drive belt and the frictional force demonstration object of clutch blocks lower extreme, and when the drive belt slows down gradually until stall, relative stillness between clutch blocks and the drive belt, vertical when the object is static frictional force on the tensiometer this moment, thereby can make things convenient for mr's circulation demonstration between dynamic frictional force and static frictional force, need not the manual operation demonstration, teaching efficiency has been improved.

2. This high school physics frictional force presentation device, through the rectangle pole that is equipped with, insert the rectangle pole in the rectangle through-hole on the locating lever, utilize rectangle through-hole and rectangle pole cooperation this moment, keep the vertical placing on the drive belt of clutch blocks, then the measuring stick of connecting rope and tensiometer is connected, operation motor operation according to the same afterwards, the drive belt drives the clutch blocks and is rolling motion around sealed bearing this moment, and then can demonstrate the rolling frictional force when the object rolls, and place experimental for the balancing weight on placing the board, transmit weight to the rectangle pole on by the dead lever when placing the weight increase on the board, the rectangle pole atress drives the link and carries out the pressure testing to the clutch blocks, thereby can carry out the rolling frictional force of pressure boost demonstration object to rolling object, and then can improve presentation device's application scope.

The part that does not relate to in the device all is the same with prior art or can adopt prior art to realize, the utility model discloses, can make things convenient for the mr to demonstrate multiple physics frictional force on presentation device and teach, improved presentation device's application scope to need not the motion state of the manual demonstration clutch blocks of mr, improved the efficiency of demonstration teaching.

Drawings

Fig. 1 is a schematic structural view of a high school physical friction force demonstration device provided by the present invention;

fig. 2 is a demonstration effect diagram of the utility model provides a high school physics frictional force presentation device.

In the figure: 1. a base; 2. a fixing plate; 3. a first roller; 4. a baffle plate; 5. a transmission belt; 6. a friction block; 7. a limit bolt; 8. a connecting frame; 9. a rectangular bar; 10. positioning the bolt; 11. placing the plate; 12. positioning a rod; 13. connecting ropes; 14. a tension meter; 15. a support plate; 16. mounting a plate; 17. a motor; 18. fixing the rod; 19. a sliding sleeve; 20. a support bar; 21. A bolt; 22. a second roller; 23. a transverse plate; 24. a portal frame.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being 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.

Referring to fig. 1-2, a high school physics friction force demonstration device, comprising a base 1, a tension meter 14, a friction block 6 and a fixed rod 18, wherein the left side of the upper end of the base 1 is connected with the rod wall of the fixed rod 18 through a support mechanism, the support mechanism comprises a vertically arranged support rod 20, a sliding sleeve 19 is sleeved on the rod wall of the support rod 20 in a sliding manner, one side of the sliding sleeve 19 is connected with a bolt 21 through a second threaded hole and a thread, the rod wall of the fixed rod 18 is fixedly connected with a connecting block, two opposite sides of the sliding sleeve 19 are rotatably connected with the connecting block through pins, the lower end of the support rod 20 is rotatably connected with the upper end of the base 1 through a connecting shaft, two ends of the fixed rod 18 are fixedly connected with fixed plates 2, one ends of the two fixed plates 2 far away from the fixed rod 18 are rotatably connected with the upper, first roller 3 and second roller 22 are the common round connection has drive belt 5, the equal axle center fixedly connected with pivot in both ends of first roller 3 and second roller 22, and the one end of pivot is passed through antifriction bearing and is connected with the lateral wall rotation of fixed plate 2, one side fixedly connected with motor 17 of fixed plate 2, the model of motor 17 is RF380, and its power input end passes through wire and speed governing switch and external power source electric connection, this technique has been widely used in the life, technical personnel in the art should know, therefore do not too much repeated, the output of motor 17 passes antifriction bearing and with axle center fixedly connected of one end of pivot, the upper end fixedly connected with mounting panel 16 of dead lever 18, one side of mounting panel 16 is equipped with measuring mechanism.

The measuring mechanism comprises two supporting plates 15 fixed on a mounting plate 16, a tension meter 14 is fixedly connected with the upper end of one of the supporting plates 15, one end of a measuring rod of the tension meter 14 is fixedly connected with a connecting rope 13, one end of the connecting rope 13 is fixedly connected with a rectangular rod 9, one end of the rectangular rod 9 is fixedly connected with a connecting frame 8, one end of the connecting frame 8 is rotatably connected with the center of a friction block 6 through a sealed bearing, one side of the connecting frame 8 is in threaded connection with a limit bolt 7 through a third threaded hole, one end of the limit bolt 7 passes through the third threaded hole and is in sliding connection with the upper side of the friction block 6, a transverse plate 23 is arranged at the upper end of the friction block 6 and the upper end of a driving belt 5 in sliding connection with the upper end of a base 1, two ends of the transverse plate 23 are respectively and fixedly connected with one side opposite to the two fixing plates 2, two baffle plates, the crossbeam center department of portal frame 24 has cup jointed the locating lever 12 of rectangle structure through the square hole slip, and the board 11 is placed to the upper end fixedly connected with of locating lever 12, and the lower extreme of locating lever 12 passes the square hole and has transversely seted up the rectangle through-hole, and there is positioning bolt 10 crossbeam one side of portal frame 24 through first screw hole threaded connection.

In the utility model, the demonstration device is assembled by referring to fig. 1, the starting motor 17 drives the rotating shaft to rotate the second roller 22, the second roller 22 rotates to drive the transmission belt 5 to rotate the first roller 3, so that the sliding friction force of the object can be demonstrated by using the friction force of the lower ends of the transmission belt 5 and the friction block 6, and when the transmission belt 5 is gradually decelerated until stopped rotating, the friction block 6 and the transmission belt 5 are relatively static, at the moment, the vertical position on the tension meter 14 is the static friction force when the object is static, thereby being convenient for the teacher to circularly demonstrate between the dynamic friction force and the static friction force, without manual operation demonstration, the teaching efficiency is improved, when the rolling friction force demonstration is needed, the demonstration device is assembled to the friction block 6 according to fig. 2, the rectangular rod 9 is inserted into the rectangular through hole on the positioning rod 12, at the moment, the rectangular through hole is matched with the rectangular rod 9, keep the vertical placing of clutch blocks 6 on drive belt 5, then will connect rope 13 and the measuring stick of tensiometer 14 and be connected, operation motor 17 operation according to the same afterwards, drive belt 5 this moment drives clutch blocks 6 and is rolling motion around sealed bearing, and then can demonstrate the rolling frictional force when the object rolls, and place experimental balancing weight on placing board 11, transmit weight to rectangular rod 9 on by dead lever 12 when placing the weight increase on board 11, rectangular rod 9 atress drives link 8 and carries out the pressure testing to clutch blocks 6, thereby can carry out the rolling frictional force of pressure boost demonstration object to rolling object, and then can improve presentation device's application scope.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A high school physics friction force demonstration device comprises a base (1), a tension meter (14), a friction block (6) and a fixed rod (18), and is characterized in that the left side of the upper end of the base (1) is connected with the rod wall of the fixed rod (18) through a supporting mechanism, the two ends of the fixed rod (18) are fixedly connected with fixed plates (2), one ends of the two fixed plates (2) far away from the fixed rod (18) are rotatably connected with the upper end of the base (1) through rotating shafts, the upper end of the base (1) is provided with a first roller (3) and a second roller (22), the first roller (3) and the second roller (22) are jointly wound and connected with a transmission belt (5), the two ends of the first roller (3) and the second roller (22) are fixedly connected with a rotating shaft in the same axis, and one end of the rotating shaft is rotatably connected with the side wall of the fixed plate (2) through a rolling bearing, one side fixedly connected with motor (17) of fixed plate (2), the output of motor (17) pass antifriction bearing and with the one end of pivot with axle center fixed connection, the upper end fixedly connected with mounting panel (16) of dead lever (18), one side of mounting panel (16) is equipped with measuring mechanism.

2. The high school physics friction demonstration device according to claim 1, characterized in that, the measuring mechanism comprises two supporting plates (15) fixed on a mounting plate (16), the tension meter (14) is fixedly connected with the upper end of one of the supporting plates (15), one end of the measuring rod of the tension meter (14) is fixedly connected with a connecting rope (13), one end of the connecting rope (13) is fixedly connected with a rectangular rod (9), one end of the rectangular rod (9) is fixedly connected with a connecting frame (8), one end of the connecting frame (8) is rotatably connected with the center of the friction block (6) through a sealed bearing, and the friction block (6) is slidably connected with the upper end of the transmission belt (5).

3. The high school physics friction force presentation device of claim 1, characterized in that, the upper end of base (1) is equipped with diaphragm (23), the both ends of diaphragm (23) respectively with two fixed plate (2) relative one side fixed connection, the upper end fixedly connected with two baffles (4) of diaphragm (23), two the common fixedly connected with portal frame (24) in upper end of baffle (4), the crossbeam center department of portal frame (24) has cup jointed locating lever (12) of rectangular structure through the square hole slip, the upper end fixedly connected with of locating lever (12) places board (11), the lower extreme of locating lever (12) passes the square hole and has transversely seted up the rectangle through-hole, crossbeam one side of portal frame (24) has positioning bolt (10) through first screw hole threaded connection.

4. The high school physics friction demonstration device of claim 1, characterized in that, the supporting mechanism includes the bracing piece (20) of vertical setting, sliding sleeve (19) has been cup jointed on the pole wall of bracing piece (20) in the slip, there is bolt (21) one side of sliding sleeve (19) through second screw hole threaded connection, fixedly connected with connecting block on the pole wall of dead lever (18), the both sides that sliding sleeve (19) is relative all are connected with the connecting block rotation through the pin, the lower extreme of bracing piece (20) is connected with the upper end rotation of base (1) through the connecting axle.

5. High school physics friction force demonstration device according to claim 2 characterized in that one side of said link (8) is connected with a limit bolt (7) through a third threaded hole, one end of said limit bolt (7) passes through the third threaded hole and is connected with the upper side of the friction block (6) in a sliding way.