A demonstration teaching aid for sliding rheostats based on electricity teaching

Abstract

This invention discloses a sliding rheostat demonstration teaching aid based on electrical teaching, belonging to the field of teaching aids. It includes a support frame, with a resistance wire fixedly connected inside. A metal rod is fixedly connected to the upper end of the support frame, and a sliding block is slidably connected to the wall of the metal rod. A metal contact piece is provided at the lower end of the sliding block. When adjusting the resistance, moving the sliding block causes a gear to rotate. Under the action of a first protrusion and a second protrusion, a first piston block moves up and down continuously, generating a low pressure inside the moving block. This causes the second piston block to move the metal contact piece upwards. When the sliding block stops rotating, the metal contact piece disengages from the resistance wire. This effectively reduces friction between the metal contact piece and the resistance wire during movement, reducing wear on the metal contact piece, ensuring stable contact between the metal contact piece and the resistance wire, and improving the lifespan and effectiveness of the device.

Description

Technical Field

[0001] This invention relates to the field of teaching aids, and more specifically, to a demonstration teaching aid of a sliding rheostat based on electricity teaching. Background Technology

[0002] A sliding rheostat is a circuit element that can control a circuit by changing its own resistance. In circuit analysis, a sliding rheostat can be used as both a fixed resistor and a variable resistor. It is one of the commonly used devices in electricity. Its working principle is to change the resistance by changing the length of the resistance wire connected to the circuit, thereby gradually changing the magnitude of the current in the circuit. The resistance wire of a sliding rheostat is generally made of nickel-chromium alloy with a high melting point and high resistance, while the metal rod is generally made of metal with low resistance. Therefore, when the cross-sectional area of ​​the resistor is constant, the longer the resistance wire, the greater the resistance, and the shorter the resistance wire, the smaller the resistance.

[0003] The metal contacts of existing rheostats are generally elastically set and always in contact with the resistance wire. The resistance wire is wound, so the surface of the resistance wire is not smooth. This causes the metal contacts to move on the outside of the resistance wire when adjusting the resistance, resulting in greater friction and unevenness. This leads to greater damage to the metal contacts. With repeated use, poor contact between the metal contacts and the resistance wire is likely to occur, affecting the experiment.

[0004] To address this, a sliding rheostat demonstration teaching aid based on electricity teaching is proposed. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a sliding rheostat demonstration teaching aid based on electrical teaching, which can reduce the wear of metal contact pieces and improve the service life of the device.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A demonstration teaching aid for a sliding rheostat based on electricity teaching includes a support frame, characterized in that: a resistance wire is fixedly connected inside the support frame, a metal rod is fixedly connected to the upper end of the support frame, a toggle block is slidably connected to the wall of the metal rod, a metal contact piece is provided at the lower end of the toggle block, and a sliding release mechanism is provided at the upper end of the metal contact piece.

[0008] The sliding release mechanism includes a rod disposed inside a support frame. A rotating assembly is located at the upper end of the rod. A movable block is rotatably connected to the outer side of the rod. A horizontal plate is fixedly connected inside the movable block. A first piston block is slidably connected to the upper end of the inner wall of the movable block. A lifting mechanism is located at the lower end of the first piston block. A first spring is fixedly connected to the upper end of the first piston block. Rectangular grooves are formed on both sides of the movable block. A second piston block is slidably connected to the lower end of the inner wall of the movable block. A second spring is fixedly connected to the upper end of the second piston block. Air holes are formed on both sides of the movable block. A first one-way valve is provided on both sides of the horizontal plate. A second one-way valve is provided on both sides of the first piston block. A support block is fixedly connected to the lower end of the second piston block. The support block is connected to a metal contact piece.

[0009] Preferably, the lifting mechanism includes a rotating block rotatably connected to the upper end of the horizontal plate, the rotating block being fixedly connected to the rod, a first protrusion being fixedly connected to the upper end of the rotating block, and a second protrusion being fixedly connected to the lower end of the first piston block.

[0010] Preferably, the rotating assembly includes a limiting horizontal block fixedly connected to the front and rear positions of the upper end of the support frame. The front limiting horizontal block has toothed blocks evenly fixedly connected inside. Gears are slidably connected to the opposite sides of the two limiting horizontal blocks. The gears mesh with the toothed blocks. The upper end of the gear is rotatably connected to the lower end of the actuating block. The lower end of the gear is connected to the upper end of the rod.

[0011] Preferably, a ring is fixedly connected to both sides of the lower end of the movable block, a cleaning block is rotatably connected inside the ring, a movable rod is uniformly fixedly connected to the outer side of the cleaning block, a round block is fixedly connected to the lower end of the rod, an arc-shaped groove is uniformly opened on the outer side of the round block, and the cleaning block is located outside the resistance wire.

[0012] Preferably, a rubber block is slidably connected to the inner wall of the cleaning block, and a third spring is fixedly connected to one end of the rubber block, with one end of the third spring connected to the cleaning block.

[0013] Preferably, the interiors of both the first piston block and the second piston block are slidably connected to the rod.

[0014] Preferably, a wire is fixedly connected to the upper end of the metal contact piece, and the upper end of the wire is connected to the toggle block.

[0015] Preferably, a rectangular block is fixedly connected to the upper end of the actuating block, and threaded rods are rotatably connected to both sides of the inner side of the rectangular block. Limiting blocks are threadedly connected to the walls of the threaded rods, and the limiting blocks fit against the inner wall of the rectangular block. The upper and lower limiting blocks are respectively provided with round holes on the left and right sides. The lower end of the threaded rod on the left side is fixedly connected to the upper end of the gear, and a moving groove is provided inside the metal rod.

[0016] Preferably, a ruler is fixedly connected to the right side of the rectangular block, and a pointer is fixedly connected to the right side of the upper limiting block.

[0017] Preferably, a support plate is fixedly connected to the lower end of the support frame, a rotating plate is fixedly connected to the lower end of the support plate, and a base is rotatably connected to the lower end of the rotating plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) When adjusting the resistance, the gear is rotated by moving the toggle block. Under the action of the first and second protrusions, the first piston block moves up and down continuously, which generates a low pressure inside the toggle block. This causes the second piston block to move the metal contact piece upward. When the toggle block stops rotating, the metal contact piece is released from the resistance wire. This effectively reduces the friction between the metal contact piece and the resistance wire when the metal contact piece moves, reduces the wear of the metal contact piece, stabilizes the contact between the metal contact piece and the resistance wire, and improves the service life and performance of the device.

[0020] (2) When the moving block moves, it drives the ring to move. The rotating rod drives the round block to rotate. The round block causes the arc groove to move. When the arc groove moves, it drives the moving rod to move in sequence. The moving rod causes the cleaning block to rotate. The cleaning block drives the rubber block to rotate. Under the action of the third spring, the rubber block wipes the dust adhering to the outside of the resistance wire, thereby ensuring the contact effect between the metal contact piece and the resistance wire and making the conductivity stable.

[0021] (3) When adjusting the resistance each time, first adjust the toggle block to the right position, rotate the right threaded rod to move the upper limit block. The movement of the limit block drives the upper limit block to move. Observe the distance the upper limit block moves through the scale and judge the size of the resistance by the distance. When the toggle block is on the right, the lower limit block is at the lower end of the rectangular block. When the toggle block moves, the gear drives the left threaded rod to rotate, causing the lower limit block to move upward. The upper limit block limits the lower limit block. This can fix the movement of the resistance and improve the applicability of the device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a partial structural diagram of the present invention;

[0024] Figure 3 This is a partial cross-sectional view of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0026] Figure 5 This is a schematic diagram of the movable block structure of the present invention;

[0027] Figure 6 This is a schematic cross-sectional view of the movable block structure of the present invention;

[0028] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0029] Figure 8 This is a schematic cross-sectional view of the cleaning block of the present invention;

[0030] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C.

[0031] Explanation of the labels in the diagram:

[0032] 1. Support frame; 2. Resistance wire; 3. Support plate; 4. Metal rod; 5. Arc groove; 6. Moving block; 7. Actuating block; 8. Circular ring; 9. Metal contact piece; 10. Wire; 11. Rectangular block; 12. Crossbar; 13. Cleaning block; 14. Rubber block; 15. Third spring; 16. Moving rod; 17. Circular block; 18. Rod; 19. Limiting crossbar; 20. Toothed block; 21. Support block; 22. Tooth 23. Wheel; 24. Air hole; 25. First piston block; 26. Second one-way valve; 27. First spring; 28. Rectangular groove; 29. ​​Second spring; 20. Rotating block; 31. First protrusion; 32. Horizontal plate; 33. First one-way valve; 34. Second protrusion; 35. Second piston block; 36. Moving groove; 37. Threaded rod; 38. Scale; 39. Limiting block; 40. Round hole; 41. Rotating plate; 42. Base. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-9 A demonstration teaching aid for a sliding rheostat based on electricity teaching includes a support frame 1, a resistance wire 2 fixedly connected inside the support frame 1, a metal rod 4 fixedly connected to the upper end of the support frame 1, and terminals provided on both sides of the metal rod 4 and both sides of the resistance wire 2 for connecting external circuits. A toggle block 7 is slidably connected to the wall of the metal rod 4, and the toggle block 7 can move on the outside of the metal rod 4. A metal contact piece 9 is provided at the lower end of the toggle block 7. The movement of the toggle block 7 causes the metal contact piece 9 to move, thereby changing the resistance. A sliding release mechanism is provided at the upper end of the metal contact piece 9.

[0035] The sliding disengagement mechanism includes a rod 18 disposed inside the support frame 1. A rotating component is provided at the upper end of the rod 18. A limiting block 19 is fixedly connected to the upper end of the support frame 1. Gear blocks 20 are evenly fixedly connected inside the front limiting block 19. A gear 22 is slidably connected to one side of each limiting block 19. The gear 22 can move left and right inside the limiting block 19. The gear 22 meshes with the gear blocks 20, so the gear 22 rotates when it moves. The upper end of the gear 22 is rotatably connected to the lower end of the actuating block 7. The movement of the actuating block 7 drives the gear 22 to move. A rod 18 is fixedly connected to the lower end of the first piston block 24. The movement of the gear 22 causes the rod 18 to move, and the rotation of the gear 22 causes the rod 18 to rotate. A moving block 6 is rotatably connected to the outer side of the rod 18. When the rod 18 moves left or right, it causes the moving block 6 to move. A horizontal plate 31 is fixedly connected inside the moving block 6. A lifting mechanism is provided at the lower end of the first piston block 24. A rotating block 29 is rotatably connected to the upper end of the horizontal plate 31. The rotating block 29 rotates relative to the horizontal plate 31. The rotating block 29 is fixedly connected to the rod 18. The rotation of the rod 18 causes the rotating block 29 to move. A first protrusion 30 is fixedly connected to the upper end of the rotating block 29. The rotation of the rotating block 29 causes the first protrusion 30 to move. The upper end of the inner wall of the movable block 6 is slidably connected to a first piston block 24, which can move up and down relative to the movable block 6. The lower end of the first piston block 24 is fixedly connected to a second protrusion 33. The first protrusion 33 moves and contacts the second protrusion 33, causing the second protrusion 33 to move upward. The second protrusion 33 causes the first piston block 24 to move upward. The upper end of the first piston block 24 is fixedly connected to a first spring 26, which exerts a downward pushing force on the first piston block 24. Rectangular grooves 27 are provided on both sides of the movable block 6. The lower end of the inner wall of the movable block 6 is slidably connected to a second piston block 34. The second piston block 34 moves up and down relative to the movable block 6. The interior of the moving block 6 can move up and down. The upper end of the second piston block 34 is fixedly connected to the second spring 28. The second spring 28 exerts a downward thrust on the second piston block 34. Air holes 23 are provided on both sides of the moving block 6. The two sides of the horizontal plate 31 are provided with the first one-way valve 32. The two sides of the first piston block 24 are provided with the second one-way valve 25. The first one-way valve 32 and the second one-way valve 25 are opposite in direction. The movement of the second piston block 34 drives the support block 21 to move. The lower end of the second piston block 34 is fixedly connected to the support block 21. The support block 21 is fixedly connected to the metal contact piece 9. The movement of the support block 21 drives the metal contact piece 9 to move.

[0036] When resistance adjustment is needed, the toggle block 7 is moved. The movement of toggle block 7 moves gear 22, which in turn moves rod 18. Rod 18 moves moving block 6. Gear 22 rotates under the action of gear block 20, causing rod 18 to rotate, which in turn rotates rotating block 29. Rotating block 29 moves first protrusion 30, bringing it into contact with second protrusion 33. The tangential force causes second protrusion 33 to move upwards, moving first piston block 24 upwards and simultaneously compressing first spring 26. When first protrusion 30 and second protrusion 33 are misaligned, the first spring 26 causes first piston block 24 to move downwards. Under the continuous rotation of the sample rotating block 29, the first piston block 24 moves up and down continuously. When the first piston block 24 moves upward, the first one-way valve 32 is open and the second one-way valve 25 is closed. This causes the first piston block 24 to move upward, drawing out the gas at the upper end of the second piston block 34. When the first piston block 24 moves downward, the first one-way valve 32 is closed and the second one-way valve 25 is open, allowing the gas between the horizontal plate 31 and the first piston block 24 to be discharged upward. The rectangular groove 27 is used to discharge the gas. As the first piston block 24 moves up and down continuously, the air pressure at the upper end of the second piston block 34 continuously decreases. This causes the second piston block 34 to move upward, compressing the second spring 28. The movement of the second piston block 34 drives the support block 21 to move upward, which in turn drives the metal contact piece 9 to move upward, causing the metal contact piece 9 to disengage from the resistance wire 2. When the actuating block 7 stops moving, the first piston block 24 no longer moves. At this time, gas enters the upper end of the second piston block 34 through the vent 23, restoring the internal air pressure. Under the action of the second spring 28, the second piston block 34 moves downward, causing the metal contact piece 9 to move downward and contact the resistance wire 2. It should be noted that the vent 23 has a small diameter. When a negative pressure is generated at the upper end of the second piston block 34, gas enters through the vent 23. The gas inside the moving block 6 is insufficient to affect its exhaust. When resistance adjustment is needed, the gear 22 rotates by moving the toggle block 7. Under the action of the first protrusion 30 and the second protrusion 33, the first piston block 24 moves up and down continuously, creating low pressure inside the moving block 6. This causes the second piston block 34 to move the metal contact piece 9 upward. When the toggle block 7 stops rotating, the metal contact piece 9 contacts the resistance wire 2. This effectively reduces the friction between the metal contact piece 9 and the resistance wire 2 during movement, reduces the wear of the metal contact piece 9, stabilizes the contact between the metal contact piece 9 and the resistance wire 2, and improves the service life and performance of the device.

[0037] like Figure 2As shown, the support frame 1 is fixedly connected to the front and rear positions of the crossbars 12. The crossbars 12 are slidably connected to the front and rear positions of the movable block 6. The crossbars 12 make the movable block 6 more stable when it moves.

[0038] like Figure 5-7 As shown, both sides of the lower end of the movable block 6 are fixedly connected to rings 8. A cleaning block 13 is rotatably connected inside the rings 8. The cleaning block 13 can rotate relative to the rings 8. Movable rods 16 are evenly fixedly connected to the outer side of the cleaning block 13. A circular block 17 is fixedly connected to the lower end of the rod 18. The rotation of the rod 18 drives the circular block 17 to move. An arc-shaped groove 5 is evenly opened on the outer side of the circular block 17. The rotation of the circular block 17 causes the arc-shaped groove 5 to move. The movement of the arc-shaped groove 5 moves the movable rod 16, thereby causing the cleaning block 13 to rotate. The cleaning block 13 is located outside the resistance wire 2. A rubber block 14 is evenly slidably connected to the inner wall of the cleaning block 13. A third spring 15 is fixedly connected to one end of the rubber block 14. The third spring 15 provides support for the rubber block 14, making the rubber block 14 fit with the resistance wire 2. One end of the third spring 15 is fixedly connected to the cleaning block 13.

[0039] When the moving block 6 moves, it drives the ring 8 to move. The rod 18 rotates, which drives the round block 17 to rotate. The round block 17 causes the arc groove 5 to move. When the arc groove 5 moves, it drives the moving rod 16 to move in sequence. The moving rod 16 causes the cleaning block 13 to rotate. The cleaning block 13 drives the rubber block 14 to rotate. Under the action of the third spring 15, the rubber block 14 wipes away the dust adhering to the outside of the resistance wire 2, thereby ensuring the contact effect between the metal contact piece 9 and the resistance wire 2 and making the conductivity stable.

[0040] like Figure 7 As shown, the interiors of the first piston block 24 and the second piston block 34 are both slidably connected.

[0041] like Figure 5 As shown, a wire 10 is fixedly connected to the upper end of the metal contact piece 9, and the upper end of the wire 10 is fixedly connected to the toggle block 7, so that the wire 10 electrically connects the metal contact piece 9 and the metal rod 4.

[0042] like Figure 3 and Figure 4As shown, a rectangular block 11 is fixedly connected to the upper end of the actuating block 7. Threaded rods 36 are rotatably connected to both sides of the interior of the rectangular block 11. Limiting blocks 38 are threadedly connected to the walls of the threaded rods 36. Each of the two threaded rods 36 is threadedly connected to a limiting block 38. The limiting blocks 38 fit against the inner wall of the rectangular block 11. When the threaded rods 36 rotate, the rectangular block 11 can move stably up and down. The upper and lower limiting blocks 38 are respectively provided with round holes 39 on the left and right sides. In this way, the limiting blocks 38 are only acted upon by one threaded rod 36. The lower end of the left threaded rod 36 is fixedly connected to the upper end of the gear 22. When the gear 22 rotates, it drives the threaded rod 36 to rotate. The metal rod 4 has a moving groove 35 inside. A scale 37 is fixedly connected to the right side of the rectangular block 11, and a pointer is fixedly connected to the right side of the upper limiting block 38.

[0043] Each time the resistance is adjusted, first adjust the toggle block 7 to the right position, then rotate the right threaded rod 36 to move the upper limit block 38. The movement of the limit block 38 drives the movement of the upper limit block 38. The distance moved by the upper limit block 38 can be observed through the scale 37 to determine the resistance value. When the toggle block 7 is on the right, the lower limit block 38 is located at the lower end of the rectangular block 11. When the toggle block 7 moves, the gear 22 drives the left threaded rod 36 to rotate, causing the lower limit block 38 to move upward. The upper limit block 38 limits the lower limit block 38, thus fixing the movement of the resistor and improving the applicability of the device. When the resistor is not fixed, simply move the upper limit block 38 to the top of the rectangular block 11.

[0044] like Figure 1 As shown, a support plate 3 is fixedly connected to the lower end of the support frame 1, a rotating plate 40 is fixedly connected to the lower end of the support plate 3, and a base 41 is rotatably connected to the lower end of the rotating plate 40. By rotating the rotating plate 40 relative to the base 41, it is easier to show the device to students from different angles.

[0045] Working principle: When resistance needs to be adjusted, the toggle block 7 is moved. The movement of toggle block 7 drives gear 22 to move, which in turn drives rod 18 to move. Rod 18 drives moving block 6 to move. Gear 22 rotates under the action of gear block 20. The rotation of gear 22 drives rod 18 to rotate, which in turn drives rotating block 29 to rotate. Rotating block 29 drives the first protrusion 30 to move. The first protrusion 30 comes into contact with the second protrusion 33. The tangential force causes the second protrusion 33 to move upward. The second protrusion 33 drives the first piston block 24 to move upward, while simultaneously compressing the first spring 26. When the first protrusion 30 and the second protrusion 33 are misaligned, the first piston block 24 moves downward under the action of the first spring 26. As the rotating block 29 continues to rotate, the first piston block 24 moves up and down continuously. When the first piston block 24 moves upward, the first one-way valve 32 is open and the second one-way valve 25 is closed. This causes the first piston block 24 to move upward, drawing out the gas at the top of the second piston block 34. When the first piston block 24 moves downward, the first one-way valve 32 is closed and the second one-way valve 25 is open, allowing the gas between the horizontal plate 31 and the first piston block 24 to be discharged upward. The rectangular groove 27 is used to discharge the gas. As the first piston block 24 moves up and down continuously, the air pressure at the top of the second piston block 34 continuously decreases. The pressure decreases, causing the second piston block 34 to move upward, compressing the second spring 28. The movement of the second piston block 34 drives the support block 21 to move upward, which in turn drives the metal contact piece 9 to move upward, causing the metal contact piece 9 to disengage from the resistance wire 2. When the actuating block 7 stops moving, the first piston block 24 no longer moves. At this point, gas enters the upper end of the second piston block 34 through the vent 23, restoring the internal air pressure. Under the action of the second spring 28, the second piston block 34 moves downward, causing the metal contact piece 9 to move downward and contact the resistance wire 2. It should be noted that the vent 23 has a small diameter; when a negative pressure is generated at the upper end of the second piston block 34, the vent 23... The gas entering the movable block 6 is insufficient to affect its exhaust. When resistance adjustment is needed, the gear 22 rotates by moving the toggle block 7. Under the action of the first protrusion 30 and the second protrusion 33, the first piston block 24 moves up and down continuously, creating low pressure inside the movable block 6. This causes the second piston block 34 to move the metal contact piece 9 upward. When the toggle block 7 stops rotating, the metal contact piece 9 contacts the resistance wire 2. This effectively reduces the friction between the metal contact piece 9 and the resistance wire 2 during movement, reduces the wear of the metal contact piece 9, stabilizes the contact between the metal contact piece 9 and the resistance wire 2, and improves the service life and performance of the device.

[0046] Furthermore, when the moving block 6 moves, it drives the ring 8 to move, the rod 18 rotates and drives the round block 17 to rotate, the round block 17 causes the arc groove 5 to move, and when the arc groove 5 moves, it drives the moving rod 16 to move in sequence, the moving rod 16 causes the cleaning block 13 to rotate, the cleaning block 13 drives the rubber block 14 to rotate, and the rubber block 14, under the action of the third spring 15, wipes away the dust adhering to the outside of the resistance wire 2, thereby ensuring the contact effect between the metal contact piece 9 and the resistance wire 2, and making the conductivity stable;

[0047] Furthermore, each time the resistance is adjusted, the toggle block 7 is first adjusted to the right position, and the right threaded rod 36 is rotated to move the upper limit block 38. The movement of the limit block 38 drives the distance the upper limit block 38 moves to be observed through the scale 37. The resistance value is judged by the distance. When the toggle block 7 is on the right, the lower limit block 38 is located at the lower end of the rectangular block 11. When the toggle block 7 moves, the gear 22 drives the left threaded rod 36 to rotate, causing the lower limit block 38 to move upward. The upper limit block 38 limits the lower limit block 38. This can fix the movement of the resistor and improve the applicability of the device. When the resistor is not fixed, it is only necessary to move the upper limit block 38 to the top of the rectangular block 11.

[0048] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A demonstration teaching aid for a sliding rheostat based on electricity teaching, comprising a support frame (1), characterized in that: A resistance wire (2) is fixedly connected inside the support frame (1). A metal rod (4) is fixedly connected to the upper end of the support frame (1). A toggle block (7) is slidably connected to the wall of the metal rod (4). A metal contact piece (9) is provided at the lower end of the toggle block (7). A sliding release mechanism is provided at the upper end of the metal contact piece (9). The sliding release mechanism includes a rod (18) disposed inside the support frame (1). The upper end of the rod (18) is provided with a rotating assembly. A moving block (6) is rotatably connected to the outer side of the rod (18). A horizontal plate (31) is fixedly connected inside the moving block (6). A first piston block (24) is slidably connected to the upper end of the inner wall of the moving block (6). A lifting mechanism is provided at the lower end of the first piston block (24). A first spring (26) is fixedly connected to the upper end of the first piston block (24). Both sides of the moving block (6) are provided with... A rectangular groove (27) is provided. A second piston block (34) is slidably connected to the lower end of the inner wall of the moving block (6). A second spring (28) is fixedly connected to the upper end of the second piston block (34). Air holes (23) are provided on both sides of the moving block (6). A first one-way valve (32) is provided on both sides of the horizontal plate (31). A second one-way valve (25) is provided on both sides of the first piston block (24). A support block (21) is fixedly connected to the lower end of the second piston block (34). The support block (21) is connected to the metal contact piece (9).

2. The sliding rheostat demonstration teaching aid based on electricity teaching according to claim 1, characterized in that: The lifting mechanism includes a rotating block (29) rotatably connected to the upper end of the horizontal plate (31). The rotating block (29) is fixedly connected to the rod (18). A first protrusion (30) is fixedly connected to the upper end of the rotating block (29), and a second protrusion (33) is fixedly connected to the lower end of the first piston block (24).

3. The sliding rheostat demonstration teaching aid based on electricity teaching according to claim 1, characterized in that: The rotating assembly includes a limiting block (19) fixedly connected to the front and rear positions of the upper end of the support frame (1). The front limiting block (19) has a toothed block (20) evenly fixedly connected inside. A gear (22) is slidably connected to the opposite side of the two limiting blocks (19). The gear (22) meshes with the toothed block (20). The upper end of the gear (22) is rotatably connected to the lower end of the actuating block (7). The lower end of the gear (22) is connected to the upper end of the rod (18).

4. The sliding rheostat demonstration teaching aid based on electricity teaching according to claim 1, characterized in that: The support frame (1) is fixedly connected to the front and rear positions of the crossbar (12), and the crossbar (12) is slidably connected to the front and rear positions of the moving block (6).

5. A sliding rheostat demonstration teaching aid based on electricity teaching according to claim 1, characterized in that, Both sides of the lower end of the moving block (6) are fixedly connected to a ring (8). A cleaning block (13) is rotatably connected inside the ring (8). A moving rod (16) is evenly fixedly connected to the outer side of the cleaning block (13). A round block (17) is fixedly connected to the lower end of the rod (18). An arc groove (5) is evenly opened on the outer side of the round block (17). The cleaning block (13) is located outside the resistance wire (2).

6. A sliding rheostat demonstration teaching aid based on electricity teaching according to claim 5, characterized in that: The inner wall of the cleaning block (13) is uniformly slidably connected with a rubber block (14), and a third spring (15) is fixedly connected to one end of the rubber block (14). One end of the third spring (15) is fixedly connected to the cleaning block (13). The interiors of the first piston block (24) and the second piston block (34) are slidably connected to the rod (18).

7. A sliding rheostat demonstration teaching aid based on electricity teaching according to claim 1, characterized in that: The upper end of the metal contact piece (9) is fixedly connected to a wire (10), and the upper end of the wire (10) is connected to the toggle block (7).

8. A sliding rheostat demonstration teaching aid based on electricity teaching according to claim 1, characterized in that: The upper end of the actuating block (7) is fixedly connected to a rectangular block (11). Both sides of the rectangular block (11) are rotatably connected to threaded rods (36). The walls of the threaded rods (36) are threadedly connected to limit blocks (38). The limit blocks (38) fit against the inner wall of the rectangular block (11). The upper and lower limit blocks (38) are respectively located on the left and right sides and have round holes (39). The lower end of the threaded rod (36) on the left side is fixedly connected to the upper end of the gear (22). The metal rod (4) has a moving groove (35) inside.

9. A sliding rheostat demonstration teaching aid based on electricity teaching according to claim 8, characterized in that: A ruler (37) is fixedly connected to the right side of the rectangular block (11), and a pointer is fixedly connected to the right side of the upper limiting block (38).

10. A sliding rheostat demonstration teaching aid based on electricity teaching according to claim 1, characterized in that: The lower end of the support frame (1) is fixedly connected to a support plate (3), the lower end of the support plate (3) is fixedly connected to a rotating plate (40), and the lower end of the rotating plate (40) is rotatably connected to a base (41).

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