Slide rheostat for experiment teaching

Abstract

The invention relates to the technical field of teaching appliances, and discloses a slide rheostat for experiment teaching, the slide rheostat comprises a porcelain cylinder, a coil, a lower binding post, a slide rod, an upper binding post, a main slide sheet, a main slide block and a midpoint interception assembly, the coil is fixedly arranged on the porcelain cylinder, the lower binding post is fixedly arranged on the edge of the coil, the lower binding post is in contact conduction with the coil, and the upper binding post is fixedly arranged on the middle point interception assembly. The sliding rod is located above the porcelain cylinder, the upper binding post is fixedly arranged at the end of the sliding rod, the main sliding block is arranged below the sliding rod in a sliding mode, the main sliding piece is fixedly arranged above the main sliding block, the main sliding piece is in contact conduction with the coil, the main sliding piece is in contact conduction with the sliding rod, and the midpoint intercepting assembly is arranged between the coil and the sliding rod. The invention particularly provides a slide rheostat for experiment teaching, which is provided with a midpoint interception assembly and is beneficial to visually displaying a current-resistance relationship.

Description

Technical Field

[0001] The invention relates to the technical field of teaching tools, in particular to a sliding rheostat for experimental teaching. Background Art

[0002] An invention patent with application number 201810966440.0 discloses a sliding rheostat for experimental teaching, and specifically discloses the technical solution of "providing a scale on the sliding rod to facilitate the staff to record the experimental results during the experiment, and providing a square hole at the upper end of the sliding piece to facilitate the staff to observe the experimental scale."

[0003] Although the application sets a scale to facilitate recording the coil access length and summarize the relationship between current and resistance for teaching, the teacher still needs to move the slider multiple times and record the readings, which makes the teaching less intuitive.

[0004] At the same time, in the existing middle school physics experiment teaching, when the teacher demonstrates the arrangement of magnetic flux lines of the magnetic field of the energized solenoid, a horizontal platform loaded with iron powder is placed near the energized solenoid, and the iron powder is made to jump and arrange along the direction of the magnetic flux lines by tapping the horizontal platform. The arrangement of iron powder on the horizontal platform is not convenient for students to observe, and there is also the problem of easy dispersion. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a sliding rheostat for experimental teaching. In order to solve the problem in the prior art that teachers need to read the coil access length multiple times and the teaching is not intuitive, the present invention proposes a sliding rheostat for experimental teaching with a midpoint interception component and is conducive to intuitively displaying the current-resistance relationship.

[0006] The technical solution adopted by the present invention is as follows: a sliding rheostat for experimental teaching, including a porcelain tube, a coil, a lower terminal, a sliding rod, an upper terminal, a main slider, a main slider and a midpoint interception assembly, the coil is fixed on the porcelain tube, the lower terminal is fixed on the edge of the coil, the lower terminal is in contact with the coil, the sliding rod is located above the porcelain tube, the upper terminal is fixed at the end of the sliding rod, the main slider is slidably arranged below the sliding rod, the main slider is fixed above the main slider, the main slider is in contact with the coil, the main slider is in contact with the sliding rod, and the midpoint interception assembly is arranged between the coil and the sliding rod.

[0007] Furthermore, the midpoint interception component includes a sub-slider, a frame, a sub-slide, a spring, a handle and a push rod, the sub-slider is slidably arranged under the slide rod, the frame is fixedly arranged on the sub-slider, the frame is slidably connected to the slide rod, the handle is fixedly arranged at the top of the frame, the push rod is vertically slidably arranged in the handle, the sub-slide is fixedly arranged at the bottom of the push rod, and the spring is fixedly arranged between the sub-slide and the frame.

[0008] Furthermore, the midpoint interception assembly also includes a gear, a movable rack and a fixed rack. The gear is rotatably arranged below the auxiliary slider, the movable rack is fixedly arranged on one side of the main slider, the movable rack is meshed with the gear, the fixed rack is located above the porcelain cylinder, the fixed rack is meshed with the gear, and the movable rack and the fixed rack are both horizontally arranged.

[0009] Furthermore, it also includes a base and a side bracket, the base is located below the porcelain cylinder, the side bracket is fixed between the porcelain cylinder and the base, and the fixed rack is fixed on the side bracket.

[0010] Furthermore, the side bracket, the lower terminal and the upper terminal are each provided with two symmetrical ones.

[0011] Furthermore, a semicircular rail is provided on the side bracket, a traction member is slidably engaged in the semicircular rail, a demonstration box is fixedly provided on one side of the traction member, and a light-transmitting cover is slidably provided on the top of the demonstration box.

[0012] Furthermore, the main slider, the auxiliary slider, the frame, the spring, the handle and the push rod are all made of insulating materials.

[0013] The beneficial effects achieved by the present invention using the above structure are as follows: 1. In view of the problem that the traditional single-slider sliding rheostat is not convenient for teachers to demonstrate the relationship between the coil access length and the current resistance, the present invention removes the insulating handle on the main slide and correspondingly sets a midpoint interception component including auxiliary slides, handles and other components. During the teaching demonstration, the teacher can drive the auxiliary slide to slide simultaneously with the main slide by moving the handle, and ensure that the access length of the auxiliary slide when it is in contact with the coil is half of the previous access length of the main slide through the mechanical transmission relationship of the gear, fixed rack and movable rack, so as to demonstrate the current resistance relationship without the teacher having to measure and read the access length.

[0014] 2. In view of the problems existing in the traditional demonstration of the magnetic field of an energized solenoid, the present invention is provided with a side bracket with a semicircular rail, a demonstration box and a light-transmitting cover plate, which has the effect of knocking the demonstration box on a horizontal plane to make the internal iron powder arranged along the direction of the magnetic flux lines, and then rotating the demonstration box to a vertical plane for students to observe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a three-dimensional schematic diagram of a sliding rheostat for experimental teaching.

[0016] Figure 2 The present invention is a cross-sectional schematic diagram of a sliding rheostat for experimental teaching.

[0017] Figure 3 It is a front view schematic diagram of the porcelain cylinder, coil, lower terminal, slide rod, upper terminal, main slide and midpoint interception assembly of the present invention.

[0018] Figure 4 It is a three-dimensional schematic diagram of the midpoint interception component of the present invention.

[0019] Figure 5 It is a cross-sectional schematic diagram of the midpoint interception component of the present invention.

[0020] Figure 6 It is a three-dimensional schematic diagram of the demonstration box, the light-transmitting cover plate and the traction member of the present invention.

[0021] Among them, 1. base, 2. side bracket, 201. semicircular rail, 3. porcelain cylinder, 4. coil, 5. lower terminal, 6. slide rod, 7. upper terminal, 8. main slide, 9. main slider, 10. midpoint interception component, 1001. auxiliary slider, 1002. frame, 1003. auxiliary slide, 1004. spring, 1005. handle, 1006. push rod, 1007. gear, 1008. moving rack, 1009. fixed rack, 11. demonstration box, 12. light-transmitting cover plate, 13. traction member.

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0023] 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. Obviously, 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.

[0024] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figure 1 to Figure 6 As shown, a sliding rheostat for experimental teaching includes a porcelain tube 3, a coil 4, a lower terminal 5, a slide bar 6, an upper terminal 7, a main slide 8, a main slider 9 and a midpoint interception component 10, wherein the coil 4 is fixed on the porcelain tube 3, the lower terminal 5 is fixed on the edge of the coil 4, the lower terminal 5 is in contact and conduction with the coil 4, the slide bar 6 is located above the porcelain tube 3, the upper terminal 7 is fixed at the end of the slide bar 6, the main slider 9 is slidably arranged below the slide bar 6, the main slide 8 is fixed above the main slider 9, the main slide 8 is in contact and conduction with the coil 4, the main slide 8 is in contact and conduction with the slide bar 6, and the midpoint interception component 10 is arranged between the coil 4 and the slide bar 6.

[0026] like Figure 1 to Figure 6 As shown, the midpoint interception component 10 includes a sub-slider 1001, a frame 1002, a sub-slide 1003, a spring 1004, a handle 1005 and a push rod 1006, the sub-slider 1001 is slidably arranged below the slide rod 6, the frame 1002 is fixedly arranged on the sub-slider 1001, the frame 1002 is slidably connected with the slide rod 6, the handle 1005 is fixedly arranged at the top of the frame 1002, the push rod 1006 is vertically slidably arranged in the handle 1005, the sub-slide 1003 is fixedly arranged at the bottom of the push rod 1006, and the spring 1004 is fixedly arranged between the sub-slide 1003 and the frame 1002.

[0027] like Figure 1 to Figure 6 As shown, the midpoint interception component 10 also includes a gear 1007, a movable rack 1008 and a fixed rack 1009. The gear 1007 is rotatably arranged below the auxiliary slider 1001, and the movable rack 1008 is fixedly arranged on one side of the main slider 9. The movable rack 1008 is meshed and connected with the gear 1007. The fixed rack 1009 is located above the porcelain cylinder 3. The fixed rack 1009 is meshed and connected with the gear 1007. The movable rack 1008 and the fixed rack 1009 are both horizontally arranged.

[0028] like Figure 1 to Figure 6 As shown, it also includes a base 1 and a side bracket 2, the base 1 is located below the porcelain cylinder 3, the side bracket 2 is fixed between the porcelain cylinder 3 and the base 1, and the fixed rack 1009 is fixed on the side bracket 2.

[0029] like Figure 1 to Figure 6 As shown, the side bracket 2, the lower terminal 5 and the upper terminal 7 are all provided with two symmetrical ones.

[0030] like Figure 1 to Figure 6As shown, the side bracket 2 is provided with a semicircular rail 201, a traction member 13 is slidably engaged in the semicircular rail 201, a demonstration box 11 is fixedly provided on one side of the traction member 13, and a light-transmitting cover plate 12 is slidably provided on the top of the demonstration box 11.

[0031] like Figure 1 to Figure 6 As shown, the main slider 9, the auxiliary slider 1001, the frame 1002, the spring 1004, the handle 1005 and the push rod 1006 are all made of insulating materials.

[0032] When using the device, the teacher demonstrates the current-resistance relationship by connecting a lower terminal 5 near the midpoint interception assembly 10 to an external power source and an ammeter with a wire, and connects any upper terminal 7 to an external power source to form a circuit. The teacher drives the box 1002, the auxiliary slider 1001, and the gear 1007 to move left and right by holding the handle 1005. Since the upper and lower sides of the gear 1007 are in meshing connection with the movable rack 1008 and the fixed rack 1009 respectively, the gear 1007 rotates when sliding left and right due to the meshing relationship with the fixed rack 1009 below, and further drives the upper movable rack 1008 to move quickly through the meshing relationship, so that the movable rack 1008 slides left and right twice the stroke of the gear 1007. Since the main slide 8 , the main slider 9 are rigidly connected to the movable rack 1008 , the auxiliary slide 1003 , the auxiliary slider 1001 , and the gear 1007 move synchronously in the vertical direction, the main slide 8 always slides left and right twice the stroke of the auxiliary slide 1003 .

[0033] Based on the characteristic that the main slide 8 always slides left and right twice the stroke of the auxiliary slide 1003, the teacher can slide the handle 1005 arbitrarily when demonstrating the current-resistance relationship under a constant voltage source, and the ammeter displays the reading corresponding to the access length of the coil 4. Subsequently, the teacher presses down the push rod 1006 without moving the handle 1005, and the push rod 1006 overcomes the resistance of the spring 1004 and drives the auxiliary slide 1003 to move downward, so that the auxiliary slide 1003 is in contact with the slide bar 6 for conduction. At this time, between the previous power supply, the lower terminal 5, the access part of the coil 4, the main slide 8 and the slide bar 6, the auxiliary slide 1003 is inserted between the access part of the coil 4 and the slide bar 6, so that the main slide 8 is short-circuited, and the length of the access part of the coil 4 becomes half of the previous one, so that the corresponding ammeter reading becomes twice the previous one, thereby achieving the effect of intuitively demonstrating the relationship between the current and resistance changes without measuring the readings.

[0034] When demonstrating the distribution of magnetic flux lines of a powered solenoid, the teacher taps the demonstration box 11 in a horizontal state, causing the iron powder inside to jump and distribute along the direction of the magnetic flux lines. The teacher then presses the transparent cover plate 12, causing the iron powder to be squeezed between the transparent cover plate 12 and the demonstration box 11 and unable to move. At this time, the teacher moves the demonstration box 11 to a nearly vertical state through the pulling member 13, so that the students can intuitively observe the distribution of magnetic flux lines of the powered solenoid.

[0035] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sliding rheostat for experimental teaching, characterized in that: The invention comprises a porcelain cylinder (3), a coil (4), a lower terminal (5), a slide bar (6), an upper terminal (7), a main slide plate (8), a main slider (9) and a midpoint interception assembly (10), wherein the coil (4) is fixedly arranged on the porcelain cylinder (3), the lower terminal (5) is fixedly arranged on the edge of the coil (4), the lower terminal (5) is in contact and conduction with the coil (4), the slide bar (6) is located above the porcelain cylinder (3), the upper terminal (7) is fixedly arranged at the end of the slide bar (6), the main slider (9) is slidably arranged below the slide bar (6), the main slide plate (8) is fixedly arranged above the main slider (9), the main slide plate (8) is in contact and conduction with the coil (4), the main slide plate (8) is in contact and conduction with the slide bar (6), and the midpoint interception assembly (10) is arranged between the coil (4) and the slide bar (6).

2. A sliding rheostat for experimental teaching according to claim 1, characterized in that: The midpoint interception component (10) comprises a secondary slider (1001), a square frame (1002), a secondary slide (1003), a spring (1004), a handle (1005) and a push rod (1006); the secondary slider (1001) is slidably arranged below the slide rod (6); the square frame (1002) is fixedly arranged on the secondary slider (1001); the square frame (1002) is slidably connected to the slide rod (6); the handle (1005) is fixedly arranged at the top of the square frame (1002); the push rod (1006) is vertically slidably arranged in the handle (1005); the secondary slide (1003) is fixedly arranged at the bottom of the push rod (1006); and the spring (1004) is fixedly arranged between the secondary slide (1003) and the square frame (1002).

3. A sliding rheostat for experimental teaching according to claim 2, characterized in that: The midpoint interception component (10) further comprises a gear (1007), a movable rack (1008) and a fixed rack (1009), wherein the gear (1007) is rotatably arranged below the auxiliary slider (1001), the movable rack (1008) is fixedly arranged on one side of the main slider (9), the movable rack (1008) is meshedly connected with the gear (1007), the fixed rack (1009) is located above the porcelain cylinder (3), the fixed rack (1009) is meshedly connected with the gear (1007), and the movable rack (1008) and the fixed rack (1009) are both arranged horizontally.

4. A sliding rheostat for experimental teaching according to claim 3, characterized in that: It also comprises a base (1) and a side bracket (2), wherein the base (1) is located below the porcelain cylinder (3), the side bracket (2) is fixedly arranged between the porcelain cylinder (3) and the base (1), and the fixed rack (1009) is fixedly arranged on the side bracket (2).

5. A sliding rheostat for experimental teaching according to claim 4, characterized in that: The side bracket (2), the lower terminal (5) and the upper terminal (7) are each provided with two symmetrical portions.

6. The sliding rheostat for experimental teaching according to claim 5, characterized in that: The side bracket (2) is provided with a semicircular rail (201), a traction member (13) is slidably engaged in the semicircular rail (201), a demonstration box (11) is fixedly provided on one side of the traction member (13), and a light-transmitting cover plate (12) is slidably provided on the top of the demonstration box (11).

7. The sliding rheostat for experimental teaching according to claim 6, characterized in that: The main slider (9), the auxiliary slider (1001), the frame (1002), the spring (1004), the handle (1005) and the push rod (1006) are all made of insulating materials.

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