Ground resistance test demonstration instrument

Abstract

The utility model discloses a grounding resistance test demonstration instrument, which belongs to the technical field of teaching aids and comprises a bottom plate and a transparent acrylic top plate. According to the utility model, the hand generator, the mutual inductor, the galvanometer, the gear switch, the potentiometer and the binding post form the grounding resistance test demonstration instrument main body, and the grounding resistance test demonstration instrument main body and the transparent acrylic top plate are packaged together through the bottom plate. Alternating current caused by potential difference flows through a current loop, meanwhile, a secondary side of the mutual inductor induces current which is in a fixed proportion with a primary side, phasor values of the two currents are sampled and sent into a transistor phase-sensitive rectifying circuit, and if the amplitudes or phases of the two currents are different, the phase-sensitive rectifying circuit is switched on. And if the distinguishing capability of the phase-sensitive rectification circuit exceeds the distinguishing capability of the phase-sensitive rectification circuit, the galvanometer gives a corresponding indication, and through the arrangement of the device, the grounding resistance test process can be demonstrated more intuitively, so that the teaching demonstration effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching aids, in particular to a ground resistance test demonstration instrument. Background Art

[0002] To cultivate young people's love for science, improving the quality of teaching is the key, and the accuracy of experimental instruments is an important factor in improving teaching. Good experimental instruments can make the experiments more convincing, so that students can understand things, understand natural phenomena, and inspire students' thinking, which plays an important role in improving the level of education. Therefore, various experimental instruments in teaching are constantly improving, but there are still many shortcomings.

[0003] In the existing teaching process of ground resistance test, the existing teaching aids cannot demonstrate the ground resistance test more intuitively, resulting in students not being able to fully understand and learn. Therefore, we need to propose a ground resistance test demonstration instrument. Utility Model Content

[0004] The purpose of the utility model is to provide a ground resistance test demonstration instrument, which has the advantage of being able to intuitively demonstrate the ground resistance test to improve students' learning effect, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides a ground resistance test demonstration instrument, comprising a bottom plate and a transparent acrylic top plate, a supporting assembly is arranged between the bottom plate and the transparent acrylic top plate, the transparent acrylic top plate is fixed to the top of the bottom plate through the supporting assembly, a hand-cranked generator and a mutual inductor are arranged between the top of the bottom plate and the transparent acrylic top plate, an active connection assembly is arranged between the hand-cranked generator and the mutual inductor and the bottom plate, the hand-cranked generator and the mutual inductor are adjustably installed on the top of the bottom plate through the active connection assembly, a galvanometer, a gear switch, a potentiometer and a terminal are installed on the top of the transparent acrylic top plate, and the hand-cranked generator, the mutual inductor, the galvanometer, the gear switch, the potentiometer and the terminal are electrically connected.

[0006] Preferably, the support assembly includes a support column, the bottom of the support column is fixedly mounted on the top of the base plate by a threaded connection assembly, a locking assembly is provided on the top of the support column, and the transparent acrylic top plate is locked and fixed to the top of the support column by the locking assembly.

[0007] Preferably, the threaded connection assembly includes a threaded column fixedly mounted on the top of the base plate, a threaded hole matching the threaded column is formed at the bottom end of the support column, and a surface of the threaded column is threadedly connected to an inner wall of the threaded hole.

[0008] Preferably, the locking assembly includes a locking rod fixedly mounted on the top of the support column, the top of the locking rod passes through the transparent acrylic top plate and extends to the top of the transparent acrylic top plate and is threadedly connected with a locking nut, and the bottom of the locking nut is in contact with the top of the transparent acrylic top plate.

[0009] Preferably, the movable connection assembly includes two sets of slide rails fixedly mounted on the top of the base plate, the inner cavities of the two sets of slide rails are slidably connected with sliders, the tops of the sliders penetrate the slide rails and extend to the outside of the slide rails where a connecting plate is fixedly mounted, and the hand-cranked generator and the mutual inductor are fixedly mounted on the top of the connecting plate.

[0010] Preferably, a positioning rod is provided on one side of the slide rail, one end of the positioning rod passes through the slide rail and extends to the inner cavity of the slide rail and is threadedly connected to the surface of the slider, and one end of the positioning rod passes through the slider and extends to the inner cavity of the slide rail and fits with the inner wall of the slide rail.

[0011] Preferably, a groove matched with the positioning rod is formed on one side of the slide rail, and the surface of the positioning rod is slidably connected to the inner wall of the groove.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model comprises a hand-cranked generator, a mutual inductor, a galvanometer, a gear switch, a potentiometer and a terminal to form a main body of a ground resistance test demonstration instrument, which is packaged together by a bottom plate and a transparent acrylic top plate. When working, an alternating current potential difference is first generated by the hand-cranked generator, and the alternating current caused by the potential difference flows through a current loop. At the same time, the secondary side of the mutual inductor induces a current that is in a fixed proportion to the primary side. The phasor values ​​of the two currents are respectively sampled and sent to a transistor phase-sensitive rectifier circuit. If there is a difference in the amplitude or phase of the two currents and it exceeds the resolution capability of the phase-sensitive rectifier circuit, the galvanometer will make a corresponding indication. Through the setting of the device, the ground resistance test process can be demonstrated more intuitively to enhance the teaching demonstration effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 It is a structural schematic diagram of the support assembly of the utility model;

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

[0017] Figure 4 It is a structural schematic diagram of the slide rail of the utility model;

[0018] Figure 5It is a schematic cross-sectional structural diagram of the support assembly of the utility model.

[0019] In the figure: 1. bottom plate; 2. transparent acrylic top plate; 3. hand-cranked generator; 4. mutual inductor; 5. ammeter; 6. gear switch; 7. terminal; 8. support column; 9. threaded column; 10. threaded hole; 11. locking rod; 12. locking nut; 13. slide rail; 14. slider; 15. connecting plate; 16. positioning rod; 17. groove; 18. potentiometer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-Figure 5 The utility model provides a ground resistance test demonstration instrument, including a bottom plate 1 and a transparent acrylic top plate 2, a hand-cranked generator 3 and a mutual inductor 4 are arranged between the top of the bottom plate 1 and the transparent acrylic top plate 2, a galvanometer 5, a gear switch 6, a potentiometer 18 and a terminal 7 are installed on the top of the transparent acrylic top plate 2, and the hand-cranked generator 3, the mutual inductor 4, the galvanometer 5, the gear switch 6, the potentiometer 18 and the terminal 7 are electrically connected.

[0022] The main body of the device is composed of a bottom plate 1, a transparent acrylic top plate 2, a hand-cranked generator, a mutual inductor 4, a galvanometer 5, a gear switch 6, a potentiometer 18 and a terminal 7. When working, the hand-cranked generator 3 first generates an AC potential difference, and the AC current caused by the potential difference flows through the current loop. At the same time, the secondary side of the mutual inductor 4 induces a current that is in a fixed proportion to the primary side. The phasor values ​​of the two currents are sampled and sent to the transistor phase-sensitive rectifier circuit. If the amplitude or phase of the two currents is different and exceeds the resolution of the phase-sensitive rectifier circuit, the galvanometer 5 will make a corresponding indication, and the galvanometer 5 indication is made to zero by adjusting the sliding resistor. If the resistance value of the current passing through the sliding resistor is known, and according to the current ratio of the current mutual inductor 4, the resistance value in the current loop can be calculated. Based on the linear relationship between the resistance and the sliding resistor, the corresponding value is marked on the uniform dial connected with the sliding resistor, and the resistance value can be read. Through the setting of this device, the ground resistance test process can be demonstrated more intuitively to improve the teaching demonstration effect.

[0023] A supporting assembly is arranged between the bottom plate 1 and the transparent acrylic top plate 2, and the transparent acrylic top plate 2 is installed and fixed to the top of the bottom plate 1 through the supporting assembly, and the supporting assembly includes a supporting column 8, and the bottom of the supporting column 8 is fixedly installed on the top of the bottom plate 1 through a threaded connection assembly, and the threaded connection assembly includes a threaded column 9 fixedly installed on the top of the bottom plate 1, and a threaded hole 10 matched with the threaded column 9 is opened at the bottom end of the supporting column 8, and the surface of the threaded column 9 is threadedly connected to the inner wall of the threaded hole 10, and a locking assembly is arranged on the top of the supporting column 8, and the transparent acrylic top plate 2 is locked and fixed to the top of the supporting column 8 through the locking assembly, and the locking assembly includes a locking rod 11 fixedly installed on the top of the supporting column 8, and the top of the locking rod 11 passes through the transparent acrylic top plate 2 and extends to the top of the transparent acrylic top plate 2 and is threadedly connected with a locking nut 12, and the bottom of the locking nut 12 is in contact with the top of the transparent acrylic top plate 2.

[0024] In this embodiment, the transparent acrylic top plate 2 is installed on the top of the bottom plate 1 through the support assembly, which can demonstrate the ground resistance test process more intuitively to enhance the teaching demonstration effect. During installation, the user first tightens the support rod to the top of the bottom plate 1 through the threaded column 9 and the threaded hole 10, and then the user clamps the transparent acrylic top plate 2 on the top of the support rod. At this time, the top of the locking rod 11 will penetrate the transparent acrylic top plate 2, and then the user can tighten the locking nut 12 on the top of the locking rod 11, thereby fixing the transparent acrylic top plate 2 on the top of the support rod.

[0025] Among them, a movable connection component is arranged between the hand-cranked generator 3 and the mutual inductor 4 and the base plate 1, and the hand-cranked generator 3 and the mutual inductor 4 are adjustably installed on the top of the base plate 1 through the movable connection component, and the movable connection component includes two sets of slide rails 13 fixedly installed on the top of the base plate 1, and the inner cavities of the two sets of slide rails 13 are slidably connected with sliders 14, and the top of the slider 14 passes through the slide rail 13 and extends to the outside of the slide rail 13 where a connecting plate 15 is fixedly installed, and the hand-cranked generator 3 and the mutual inductor 4 are fixedly installed on the top of the connecting plate 15.

[0026] In this embodiment, the positions of the hand-cranked generator 3 and the mutual inductor 4 installed on the bottom plate 1 can be adjusted by setting the movable connection assembly. When other experiments are required, the position of the connecting plate 15 can also be adjusted to install other electrical components. During adjustment, the user can move the position of the connecting plate 15 to adjust the installation position of the electrical components. After the adjustment is completed, the user can install and fix the hand-cranked generator 3 and the mutual inductor 4 on the top of the connecting plate 15, and then fix them on the top of the bottom plate 1.

[0027] It is worth mentioning that a positioning rod 16 is provided on one side of the slide rail 13, one end of the positioning rod 16 penetrates the slide rail 13 and extends to the inner cavity of the slide rail 13 and is threadedly connected to the surface of the slider 14, one end of the positioning rod 16 penetrates the slider 14 and extends to the inner cavity of the slide rail 13 and fits with the inner wall of the slide rail 13, and a groove 17 matched with the positioning rod 16 is opened on one side of the slide rail 13, and the surface of the positioning rod 16 is slidably connected to the inner wall of the groove 17.

[0028] By setting the positioning rod 16, after adjusting the use position of the connecting plate 15, the user can tighten the positioning rod 16. The rotation of the positioning rod 16 will cause one end of the positioning rod 16 to pass through the slide rail 13 and the slider 14 in turn and extend to the inner cavity of the slide rail 13 to fit the inner wall of the slide rail 13, thereby positioning and fixing the use position of the slider 14 and the connecting plate 15. By setting the groove 17, a moving space can be provided for the positioning rod 16, and when the slider 14 is moved, the positioning rod 16 will be driven to slide in the inner cavity of the groove 17.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ground resistance test demonstration instrument, comprising a bottom plate (1) and a transparent acrylic top plate (2), characterized in that: A support assembly is provided between the bottom plate (1) and the transparent acrylic top plate (2); the transparent acrylic top plate (2) is fixedly mounted on the top of the bottom plate (1) through the support assembly; a hand-cranked generator (3) and a mutual inductor (4) are provided between the top of the bottom plate (1) and the transparent acrylic top plate (2); a movable connection assembly is provided between the hand-cranked generator (3) and the mutual inductor (4) and the bottom plate (1); the hand-cranked generator (3) and the mutual inductor (4) are adjustably mounted on the top of the bottom plate (1) through the movable connection assembly; a galvanometer (5), a gear switch (6), a potentiometer (18) and a terminal (7) are installed on the top of the transparent acrylic top plate (2); the hand-cranked generator (3), the mutual inductor (4), the galvanometer (5), the gear switch (6), the potentiometer (18) and the terminal (7) are electrically connected.

2. A ground resistance test demonstration instrument according to claim 1, characterized in that: The support assembly comprises a support column (8), the bottom of the support column (8) is fixedly mounted on the top of the base plate (1) via a threaded connection assembly, a locking assembly is provided on the top of the support column (8), and the transparent acrylic top plate (2) is locked and fixed to the top of the support column (8) via the locking assembly.

3. A ground resistance test demonstration instrument according to claim 2, characterized in that: The threaded connection assembly comprises a threaded column (9) fixedly mounted on the top of the base plate (1); a threaded hole (10) matching the threaded column (9) is provided at the bottom end of the support column (8); and the surface of the threaded column (9) is threadedly connected to the inner wall of the threaded hole (10).

4. A ground resistance test demonstration instrument according to claim 2, characterized in that: The locking assembly comprises a locking rod (11) fixedly mounted on the top of the support column (8); the top of the locking rod (11) penetrates the transparent acrylic top plate (2) and extends to the top of the transparent acrylic top plate (2) and is threadedly connected with a locking nut (12); the bottom of the locking nut (12) is in contact with the top of the transparent acrylic top plate (2).

5. A ground resistance test demonstration instrument according to claim 1, characterized in that: The movable connection assembly comprises two groups of slide rails (13) fixedly mounted on the top of the base plate (1), the inner cavities of the two groups of slide rails (13) are slidably connected with sliders (14), the tops of the sliders (14) penetrate the slide rails (13) and extend to the outside of the slide rails (13) where a connecting plate (15) is fixedly mounted, and the hand-cranked generator (3) and the mutual inductor (4) are fixedly mounted on the tops of the connecting plates (15).

6. A ground resistance test demonstration instrument according to claim 5, characterized in that: A positioning rod (16) is provided on one side of the slide rail (13), one end of the positioning rod (16) passes through the slide rail (13) and extends to the inner cavity of the slide rail (13) and is threadedly connected to the surface of the slider (14), and one end of the positioning rod (16) passes through the slider (14) and extends to the inner cavity of the slide rail (13) and is in contact with the inner wall of the slide rail (13).

7. A ground resistance test demonstration instrument according to claim 6, characterized in that: A groove (17) adapted to the positioning rod (16) is provided on one side of the slide rail (13), and the surface of the positioning rod (16) is slidably connected to the inner wall of the groove (17).

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