Slide rheostat demonstration teaching aid based on electricity teaching

Abstract

The invention discloses a slide rheostat demonstration teaching aid based on electricity teaching, and belongs to the field of teaching aids, the slide rheostat demonstration teaching aid comprises a support frame, a resistance wire is fixedly connected in the support frame, a metal rod is fixedly connected to the upper end of the support frame, and a shifting block is slidably connected to the rod wall of the metal rod. When the resistor is adjusted, the shifting block is moved to enable the gear to rotate, under the action of the first protruding block and the second protruding block, the first piston block continuously moves up and down, low pressure is generated in the moving block, the second piston block drives the metal contact piece to move upwards, and therefore the resistor is adjusted. And when the shifting block stops rotating, the metal contact piece and the resistance wire are released, so that the friction between the metal contact piece and the resistance wire can be effectively reduced when the metal contact piece moves, the loss of the metal contact piece is reduced, the contact between the metal contact piece and the resistance wire is stable, the service life of the device is prolonged, and the use effect of the device is improved.

Description

Technical Field

[0001] The present invention relates to the field of teaching aids, and more particularly to a sliding rheostat demonstration teaching aid based on electrical teaching. Background Art

[0002] A sliding rheostat is a circuit element that can change its own resistance to control the circuit. In circuit analysis, a sliding rheostat can be used as both a fixed resistor and a variable resistor. A sliding rheostat is one of the commonly used devices in electrical engineering. Its working principle is to change the resistance by changing the length of the resistance wire connected to the circuit, thereby gradually changing the current in the circuit. The resistance wire of a sliding rheostat is generally a nickel-chromium alloy with a high melting point and high resistance, and the metal rod is generally a 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 contact piece of the existing variable resistor is generally elastically set and always fits between the resistance wire. The resistance wire is wound, so the surface of the resistance wire is not smooth. As a result, when adjusting the resistance, the metal contact piece moves on the outside of the resistance wire, causing large friction and unevenness, resulting in greater damage to the metal contact piece. After being used many times, it is easy for the metal contact piece and the resistance wire to have poor contact, affecting the experiment.

[0004] Therefore, a sliding rheostat demonstration teaching aid based on electrical teaching is proposed. Summary of the Invention

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

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

[0007] A sliding rheostat demonstration teaching aid for electrical teaching, comprising a support frame, characterized in that: a resistance wire is fixedly connected to the interior of 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 rod wall of the metal rod, a metal contact piece is provided at the lower end of the toggle block, and a sliding disengagement mechanism is provided at the upper end of the metal contact piece; The sliding disengagement mechanism includes a rod member arranged inside the support frame, the upper end of the rod member is provided with a rotating assembly, the outer side of the rod member is rotatably connected to a moving block, the interior of the moving block is fixedly connected to a cross plate, the upper end of the inner wall of the moving block is slidably connected to a first piston block, the lower end of the first piston block is provided with a lifting mechanism, the upper end of the first piston block is fixedly connected to a first spring, rectangular grooves are provided on both sides of the moving block, the lower end of the inner wall of the moving block is slidably connected to a second piston block, the upper end of the second piston block is fixedly connected to a second spring, air holes are provided on both sides of the moving block, first one-way valves are provided on both sides of the cross plate, second one-way valves are provided on both sides of the first piston block, the lower end of the second piston block is fixedly connected to a support block, and the support block is connected to a metal contact piece.

[0008] Preferably, the lifting mechanism includes a rotating block rotatably connected to the upper end of the transverse plate, the rotating block is fixedly connected to the rod, the upper end of the rotating block is fixedly connected to a first protrusion, and the lower end of the first piston block is fixedly connected to a second protrusion.

[0009] Preferably, the rotating assembly includes a limiting cross block fixedly connected to the front and rear positions of the upper end of the support frame, and a tooth block is evenly fixedly connected to the inside of the limiting cross block at the front end, and a gear is slidably connected to the opposite side of the two limiting cross blocks, and the gear is meshed with the tooth block. The upper end of the gear is rotatably connected to the lower end of the toggle block, and the lower end of the gear is connected to the upper end of the rod.

[0010] Preferably, circular rings are fixedly connected on both sides of the lower end of the movable block, a cleaning block is rotatably connected inside the circular ring, a movable rod is evenly fixedly connected to the outside of the cleaning block, the lower end of the rod is fixedly connected to a circular block, arc grooves are evenly opened on the outside of the circular block, and the cleaning block is located on the outside of the resistance wire.

[0011] Preferably, a rubber block is evenly and slidably connected to the inner wall of the cleaning block, one end of the rubber block is fixedly connected to a third spring, and one end of the third spring is connected to the cleaning block.

[0012] Preferably, the interiors of the first piston block and the second piston block are both slidably connected to the rod.

[0013] 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.

[0014] Preferably, the upper end of the toggle block is fixedly connected to a rectangular block, and threaded rods are rotatably connected on both sides of the interior of the rectangular block. The rod walls of the threaded rods are threadedly connected to limit blocks, and the limit blocks are fitted with the inner walls of the rectangular block. The upper and lower limit blocks are respectively located on the left and right sides and are provided with circular holes. The lower end of the threaded rod on the left is fixedly connected to the upper end of the gear, and a movable groove is provided inside the metal rod.

[0015] 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 limit block.

[0016] Preferably, the lower end of the support frame is fixedly connected to a support plate, the lower end of the support plate is fixedly connected to a rotating plate, and the lower end of the rotating plate is rotatably connected to a base.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) When adjusting the resistance, the gear rotates by moving the toggle block. Under the action of the first and second protrusions, the first piston block continuously moves up and down, so that low pressure is generated inside the moving block, and the second piston block drives the metal contact piece to move up. When the toggle block stops rotating, the metal contact piece is released from the resistance wire, which can effectively reduce the friction between the metal contact piece and the resistance wire when it moves, reduce the loss of the metal contact piece, make the contact between the metal contact piece and the resistance wire stable, and improve the service life and use effect of the device.

[0018] (2) When the moving block moves, it drives the circular ring to move. The rotation of the rod drives the circular block to rotate. The circular block causes the arc groove to move. When the arc groove moves, it drives the moving rod to move in turn. 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 moves to the outside of the resistance wire to wipe off the dust attached to the outside of the resistance wire, thereby ensuring the contact effect between the metal contact piece and the resistance wire and making the conduction stable.

[0019] (3) Each time the resistance is adjusted, the toggle block is first adjusted to the right position, and the threaded rod on the right is rotated to move the upper limit block. The movement of the limit block drives the distance moved by the upper limit block to be observed through the ruler, and the size of the resistance is judged by the distance. When the toggle block is located on the right, the lower limit block is located at the lower end of the rectangular block. When the toggle block moves, the gear drives the threaded rod on the left to rotate, so that the lower limit block moves upward, and the upper limit block limits the lower limit block. In this way, the movement of the resistance can be determined, which improves the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the present invention; Figure 3 It is a partial cross-sectional structural schematic diagram of the present invention; Figure 4 For the present invention Figure 3 A in the middle is an enlarged structural diagram; Figure 5 It is a schematic diagram of the structure of the moving block of the present invention; Figure 6 It is a schematic cross-sectional structural diagram of the moving block of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle; Figure 8 This is a schematic cross-sectional view of the cleaning block of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C in the middle.

[0021] Description of the numbers in the figure: 1. Support frame; 2. Resistance wire; 3. Support plate; 4. Metal rod; 5. Arc groove; 6. Moving block; 7. Toggle block; 8. 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. Round block; 18. Rod; 19. Limiting cross block; 20. Tooth block; 21. Support block; 22. Tooth Wheel; 23. Air hole; 24. First piston block; 25. Second one-way valve; 26. First spring; 27. Rectangular groove; 28. Second spring; 29. ​​Rotating block; 30. First protrusion; 31. Cross plate; 32. First one-way valve; 33. Second protrusion; 34. Second piston block; 35. Moving groove; 36. Threaded rod; 37. Ruler; 38. Limit block; 39. Round hole; 40. Rotating plate; 41. Base. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-9A sliding rheostat demonstration teaching aid based on electrical teaching includes a support frame 1, a resistance wire 2 is fixedly connected to the inside of the support frame 1, a metal rod 4 is fixedly connected to the upper end of the support frame 1, both sides of the metal rod 4 and the resistance wire 2 are provided with terminal blocks for connecting to external circuits, a toggle block 7 is slidably connected to the rod wall of the metal rod 4, the toggle block 7 can move outside 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 drives the metal contact piece 9 to move, thereby changing the size of the resistance, and a sliding disengagement mechanism is provided at the upper end of the metal contact piece 9; The sliding disengagement mechanism includes a rod 18 arranged inside the support frame 1, and a rotating assembly is provided at the upper end of the rod 18. The upper end of the support frame 1 is fixedly connected to the limiting horizontal block 19, and the interior of the front limiting horizontal block 19 is evenly fixedly connected with a tooth block 20. The opposite side of the two limiting horizontal blocks 19 is slidably connected with a gear 22. The gear 22 can move left and right inside the limiting horizontal block 19. The gear 22 is meshed with the tooth block 20. The gear 22 is meshed with the tooth block 20, so the gear 22 will rotate when it moves. The upper end of the gear 22 is rotatably connected to the lower end of the toggle block 7. The movement of the toggle block 7 drives the gear 22 to move. The gear 22 The lower end of the rod 18 is fixedly connected, and the gear 22 moves to drive the rod 18 to move, and the gear 22 rotates to drive the rod 18 to rotate. The outer side of the rod 18 is rotatably connected to the moving block 6. When the rod 18 moves left and right, the moving block 6 is driven to move. The inside of the moving block 6 is fixedly connected to the cross plate 31. The lower end of the first piston block 24 is provided with a jacking mechanism. The upper end of the cross plate 31 is rotatably connected to the rotating block 29. The rotating block 29 rotates relative to the cross plate 31. The rotating block 29 is fixedly connected to the rod 18. The rotation of the rod 18 drives the rotating block 29 to move. The upper end of the rotating block 29 is fixedly connected to the first protrusion 30. The rotating block 29 drives the first protrusion 30 to move. The first piston block 24 is slidably connected to the upper end of the inner wall of the moving block 6, and the first piston block 24 can move up and down relative to the moving block 6. The lower end of the first piston block 24 is fixedly connected to the second protrusion 33. The first protrusion 30 moves and contacts with the second protrusion 33, so that the second protrusion 33 moves upward, and 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 the first spring 26, and the first spring 26 has a downward thrust on the first piston block 24. Rectangular grooves 27 are provided on both sides of the moving block 6. The lower end of the inner wall of the moving block 6 is slidably connected to the second piston block 34. The second piston block 34 moves The interior of the movable block 6 can move up and down, and the upper end of the second piston block 34 is fixedly connected to the second spring 28. The second spring 28 has a downward thrust on the second piston block 34. Air holes 23 are provided on both sides of the movable block 6, and first one-way valves 32 are provided on both sides of the cross plate 31. Second one-way valves 25 are provided on both sides of the first piston block 24. The first one-way valve 32 and the second one-way valve 25 are in opposite directions. 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. When the resistance needs to be adjusted, the toggle block 7 is moved, and the movement of the toggle block 7 drives the gear 22 to move, and the movement of the gear 22 drives the rod 18 to move, and the rod 18 drives the moving block 6 to move. The gear 22 rotates under the action of the tooth block 20, and the rotation of the gear 22 drives the rod 18 to rotate, and the rotation of the rod 18 drives the rotating block 29 to rotate, and the rotating block 29 drives the first protrusion 30 to move, and the first protrusion 30 moves and contacts the second protrusion 33. The tangential force causes the second protrusion 33 to move upward, and the second protrusion 33 drives the first piston block 24 to move upward, and at the same time compresses 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. Under the action of the continuous rotation of the sample rotating block 29, the first piston block 24 is continuously moved up and down. When the first piston block 24 moves upward, the first one-way valve 32 is in an open state and the second one-way valve 25 is in a closed state. Then the first piston block 24 moves upward, so that the gas at the upper end of the second piston block 34 is sucked out. When the first piston block 24 moves downward, the first one-way valve 32 is in a closed state and the second one-way valve 25 is in an open state. In this way, the gas between the cross plate 31 and the first piston block 24 can be discharged upward, and the rectangular groove 27 is used to discharge the gas. In this way, the first piston block 24 continuously moves up and down, so that the air pressure at the upper end of the second piston block 34 is continuously reduced, thereby The second piston block 34 moves upward, compressing the second spring 28. The movement of the second piston block 34 drives the support block 21 to move upward, and the support block 21 drives the metal contact piece 9 to move upward, so that the metal contact piece 9 is separated from the resistance wire 2. When the toggle block 7 stops moving, the first piston block 24 no longer moves. At this time, the upper end of the second piston block 34 enters the gas through the air hole 23, so that the internal air pressure is restored. Under the action of the second spring 28, the second piston block 34 moves downward, and then the metal contact piece 9 moves downward. The metal contact piece 9 moves and contacts the resistance wire 2. It should be noted that the diameter of the air hole 23 is small. When negative pressure is generated at the upper end of the second piston block 34, the air hole 23 enters The gas inside the moving block 6 is not enough to affect the exhaust of the moving block 6. In this way, when the resistance needs to be adjusted, the gear 22 is rotated by moving the toggle block 7. Under the action of the first protrusion 30 and the second protrusion 33, the first piston block 24 is continuously moved up and down, so that low pressure is generated inside the moving block 6, so that the second piston block 34 drives the metal contact piece 9 to move upward. When the toggle block 7 stops rotating, the metal contact piece 9 is in contact with the resistance wire 2. This can effectively reduce the friction between the metal contact piece 9 and the resistance wire 2 when it moves, reduce the loss of the metal contact piece 9, make the contact between the metal contact piece 9 and the resistance wire 2 stable, and improve the service life and use effect of the device.

[0024] like Figure 2As shown, the front and rear positions of the support frame 1 are fixedly connected with cross bars 12, and the cross bars 12 are slidably connected to the front and rear positions of the moving block 6. The setting of the cross bars 12 makes the moving block 6 more stable when moving.

[0025] like Figure 5-7 As shown, both sides of the lower end of the moving block 6 are fixedly connected with a circular ring 8, and the inner rotation of the circular ring 8 is connected to the cleaning block 13, and the cleaning block 13 can rotate relative to the circular ring 8. The outer side of the cleaning block 13 is evenly fixedly connected with a moving rod 16, and the lower end of the rod 18 is fixedly connected with a circular block 17. The rotation of the rod 18 drives the circular block 17 to move. The outer side of the circular block 17 is evenly provided with an arc groove 5. The rotation of the circular block 17 causes the arc groove 5 to move. The movement of the arc groove 5 drives the moving rod 16 to move, thereby causing the cleaning block 13 to rotate. The cleaning block 13 is located on the outer side of the resistance wire 2, and the inner wall of the cleaning block 13 is evenly slidably connected with a rubber block 14. One end of the rubber block 14 is fixedly connected to a third spring 15. The third spring 15 has a supporting effect on the rubber block 14, so that the rubber block 14 fits the resistance wire 2, and one end of the third spring 15 is fixedly connected to the cleaning block 13; When the moving block 6 moves, it drives the ring 8 to move, and the rotation of the rod 18 drives the circular block 17 to rotate. The circular block 17 makes the arc groove 5 move. When the arc groove 5 moves, it drives the moving rod 16 to move in turn. The moving rod 16 makes the cleaning block 13 rotate, and the cleaning block 13 drives the rubber block 14 to rotate. Under the action of the third spring 15, the rubber block 14 moves to the outside of the resistance wire 2 to wipe off the dust attached to the outside of the resistance wire 2, thereby ensuring the contact effect between the metal contact piece 9 and the resistance wire 2, making the conductivity stable.

[0026] like Figure 7 As shown, the interiors of the first piston block 24 and the second piston block 34 are both slidably connected.

[0027] like Figure 5 As shown, 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 fixedly connected to the toggle block 7 , so that the wire 10 electrically connects the metal contact piece 9 and the metal rod 4 .

[0028] like Figure 3 and Figure 4As shown, the upper end of the toggle block 7 is fixedly connected to the rectangular block 11, and the inner sides of the rectangular block 11 are rotatably connected to threaded rods 36, and the rod walls of the threaded rods 36 are threadedly connected to limit blocks 38. The two threaded rods 36 are respectively threadedly connected to a limit block 38, and the limit blocks 38 fit the inner wall of the rectangular block 11. When the threaded rod 36 rotates, the rectangular block 11 can move up and down stably. The upper and lower limit blocks 38 are respectively located at the left and right sides and are provided with circular holes 39. In this way, the limit block 38 is only affected 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, the threaded rod 36 is driven to rotate. A moving groove 35 is provided inside the metal rod 4. The right side of the rectangular block 11 is fixedly connected to a ruler 37, and the right side of the upper limit block 38 is fixedly connected to a pointer. Each time the resistance is adjusted, the toggle block 7 is first adjusted to the right position, and the threaded rod 36 on the right is rotated to move the upper limit block 38. The limit block 38 moves and drives the distance moved by the upper limit block 38 through the ruler 37. The size of the resistance is judged by the distance. When the toggle block 7 is located 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 threaded rod 36 on the left to rotate, so that the lower limit block 38 moves upward, and the upper limit block 38 limits the lower limit block 38. In this way, the movement of the resistance can be fixed, which improves the applicability of the device. When the resistance does not need to be fixed, it is only necessary to move the upper limit block 38 to the uppermost end of the rectangular block 11.

[0029] like Figure 1 As shown, the lower end of the support frame 1 is fixedly connected to the support plate 3, the lower end of the support plate 3 is fixedly connected to the rotating plate 40, and the lower end of the rotating plate 40 is rotatably connected to the base 41. By rotating the rotating plate 40 relative to the base 41, it is convenient to show the device to students from different angles.

[0030] Working principle: When the resistance needs to be adjusted, the toggle block 7 is moved, and the movement of the toggle block 7 drives the gear 22 to move, and the movement of the gear 22 drives the rod 18 to move, and the rod 18 drives the moving block 6 to move. The gear 22 rotates under the action of the tooth block 20, and the rotation of the gear 22 drives the rod 18 to rotate, and the rotation of the rod 18 drives the rotating block 29 to rotate, and the rotating block 29 drives the first protrusion 30 to move, and the first protrusion 30 moves and contacts the second protrusion 33. The tangential force causes the second protrusion 33 to move upward, and the second protrusion 33 drives the first piston block 24 to move upward, and at the same time compresses the first spring 26. When the first protrusion 30 and the second protrusion 33 are misaligned, the first piston block 24 is moved downward under the action of the first spring 26. The first piston block 24 is moved upward, and the first one-way valve 32 is in an open state and the second one-way valve 25 is in a closed state. Then, the first piston block 24 moves upward, so that the gas at the upper end of the second piston block 34 is sucked out. When the first piston block 24 moves downward, the first one-way valve 32 is in a closed state and the second one-way valve 25 is in an open state. In this way, the gas between the cross plate 31 and the first piston block 24 can be discharged upward, and the rectangular groove 27 is used to discharge the gas. In this way, the first piston block 24 continuously moves up and down, so that the air pressure at the upper end of the second piston block 34 continuously decreases. The second piston block 34 moves downward, compressing the second spring 28. The movement of the second piston block 34 drives the support block 21 to move upward, and the support block 21 drives the metal contact piece 9 to move upward, so that the metal contact piece 9 is separated from the resistance wire 2. When the toggle block 7 stops moving, the first piston block 24 no longer moves. At this time, the upper end of the second piston block 34 enters the gas through the air hole 23, so that the internal air pressure is restored. Under the action of the second spring 28, the second piston block 34 moves downward, thereby moving the metal contact piece 9 downward, and the metal contact piece 9 moves to contact the resistance wire 2. It should be noted that the diameter of the air hole 23 is small. When the negative pressure is generated at the upper end of the second piston block 34, the air hole 23 The gas entering the moving block 6 is not enough to affect the exhaust of the moving block 6. In this way, when the resistance needs to be adjusted, the gear 22 is rotated by moving the toggle block 7. Under the action of the first protrusion 30 and the second protrusion 33, the first piston block 24 is continuously moved up and down, so that low pressure is generated inside the moving block 6, so that the second piston block 34 drives the metal contact piece 9 to move upward. When the toggle block 7 stops rotating, the metal contact piece 9 is in contact with the resistance wire 2. This can effectively reduce the friction between the metal contact piece 9 and the resistance wire 2 when the metal contact piece 9 moves, reduce the loss of the metal contact piece 9, make the contact between the metal contact piece 9 and the resistance wire 2 stable, and improve the service life and use effect of the device; Furthermore, when the moving block 6 moves, it drives the ring 8 to move, and the rod 18 rotates to drive the circular block 17 to rotate. The circular block 17 causes the arc groove 5 to move. When the arc groove 5 moves, it drives the moving rod 16 to move in turn. The moving rod 16 causes the cleaning block 13 to rotate, and the cleaning block 13 drives the rubber block 14 to rotate. Under the action of the third spring 15, the rubber block 14 moves on the outside of the resistance wire 2 to wipe off the dust attached to the outside of the resistance wire 2, thereby ensuring the contact effect between the metal contact piece 9 and the resistance wire 2, making the conduction stable. Furthermore, each time the resistance is adjusted, the toggle block 7 is first adjusted to the right position, and the threaded rod 36 on the right is rotated to move the upper limit block 38. The limit block 38 moves and drives the distance moved by the upper limit block 38 to be observed through the scale 37, and the size of the resistance is judged by the distance. When the toggle block 7 is located 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 threaded rod 36 on the left to rotate, so that the lower limit block 38 moves upward, and the upper limit block 38 limits the lower limit block 38. In this way, the movement of the resistance can be fixed, which improves the applicability of the device. When the resistance does not need to be fixed, it is only necessary to move the upper limit block 38 to the uppermost end of the rectangular block 11.

[0031] 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 person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A sliding rheostat demonstration teaching aid based on electrical teaching, comprising a support frame (1), characterized in that: The support frame (1) is fixedly connected to a resistance wire (2), the upper end of the support frame (1) is fixedly connected to a metal rod (4), the rod wall of the metal rod (4) is slidably connected to a toggle block (7), the lower end of the toggle block (7) is provided with a metal contact piece (9), and the upper end of the metal contact piece (9) is provided with a sliding disengagement mechanism; The sliding disengagement mechanism comprises a rod (18) arranged inside the support frame (1), a rotating assembly is provided at the upper end of the rod (18), a moving block (6) is rotatably connected to the outer side of the rod (18), a transverse plate (31) is fixedly connected to the interior of 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), and both sides of the moving block (6) are provided with A rectangular groove (27) is provided, the lower end of the inner wall of the moving block (6) is slidably connected to a second piston block (34), the upper end of the second piston block (34) is fixedly connected to a second spring (28), air holes (23) are provided on both sides of the moving block (6), first one-way valves (32) are provided on both sides of the transverse plate (31), second one-way valves (25) are provided on both sides of the first piston block (24), the lower end of the second piston block (34) is fixedly connected to a support block (21), and the support block (21) is connected to the metal contact piece (9).

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

3. The sliding rheostat demonstration teaching aid for electrical teaching according to claim 1, characterized in that: The rotating assembly includes a limiting horizontal block (19) fixedly connected to the front and rear positions of the upper end of the support frame (1), a tooth block (20) is evenly fixedly connected inside the front limiting horizontal block (19), and a gear (22) is slidably connected to the opposite side of the two limiting horizontal blocks (19), the gear (22) is meshed with the tooth block (20), the upper end of the gear (22) is rotatably connected to the lower end of the toggle block (7), and the lower end of the gear (22) is connected to the upper end of the rod (18).

4. The sliding rheostat demonstration teaching aid for electrical teaching according to claim 1, characterized in that: The front and rear positions of the support frame (1) are fixedly connected to a cross bar (12), and the cross bar (12) is slidably connected to the front and rear positions of the moving block (6).

5. The sliding rheostat demonstration teaching aid based on electrical teaching according to claim 1, characterized in that: Both sides of the lower end of the movable block (6) are fixedly connected to circular rings (8), the interior of the circular ring (8) is rotatably connected to a cleaning block (13), the outer side of the cleaning block (13) is evenly fixedly connected to a movable rod (16), the lower end of the rod (18) is fixedly connected to a circular block (17), the outer side of the circular block (17) is evenly provided with arc grooves (5), and the cleaning block (13) is located outside the resistance wire (2).

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

7. The sliding rheostat demonstration teaching aid for electrical 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. The sliding rheostat demonstration teaching aid for electrical teaching according to claim 1, characterized in that: The upper end of the toggle block (7) is fixedly connected to a rectangular block (11), and threaded rods (36) are rotatably connected to both sides of the interior of the rectangular block (11). The rod walls of the threaded rod (36) are threadedly connected to a limit block (38), and the limit block (38) is fitted with 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 are provided with circular holes (39). The lower end of the threaded rod (36) on the left is fixedly connected to the upper end of the gear (22), and a movable groove (35) is provided inside the metal rod (4).

9. The sliding rheostat demonstration teaching aid for electrical 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 limit block (38).

10. The sliding rheostat demonstration teaching aid for electrical 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).

Images