Physical and electrical teaching experiment table

Abstract

The utility model relates to a kind of physical electrical teaching experiment table, including experiment table, experimental platform on desktop, table apron and electrical instrument storage box in experiment table lower part;Power supply master switch, alternating current power indicator light, alternating current power socket, alternating current voltmeter, direct current power output binding post, direct current voltmeter, direct current voltage output adjusting knob and direct current power overload short-circuit alarm are sequentially arranged and installed on the table apron;The electrical instrument storage box is divided into left and right two parts;Right part is drawer structure;Left part layer board structure;The lowermost space of the electrical instrument storage box of left part is installed with 1 isolation transformer and 1 adjustable direct current stabilized power supply;The utility model is convenient and flexible to meet the requirement of electrical experiment in physics, use safe and convenient, and overload, overflow automatic protection measure is good, is the essential experimental equipment of modern physics laboratory.

Description

Technical Field

[0001] This utility model belongs to the field of electrical safety experiment technology, specifically, it relates to a physical electricity teaching experiment platform. Background Technology

[0002] In physics electricity experiments, not only do teachers need to demonstrate experiments, but students also need to complete them themselves. When students conduct electricity experiments, the electrical instruments are relatively large and numerous, and power supplies are indispensable. There are also many power cords, and the instruments take up a lot of space on the table, leaving less space for students to conduct experiments, thus affecting both the effectiveness and safety of the experiments. Current technologies widely use storage cabinets on the lab benches to solve the problem of electrical instruments taking up too much space on the table, and use residual current devices (RCDs) to ensure student electrical safety.

[0003] For example, on August 20, 2014, Chinese Utility Model Authorization Announcement No. CN 203786982 U disclosed a power supply control device for a teaching experimental platform, including: a teacher demonstration platform and a student experimental platform, with a power input, a first air switch, a leakage current protector, a second air switch group, and a student desk power supply control signal output connected in sequence; the student experimental platform includes a student desk power supply control signal input and a relay connected in sequence. Although this experimental platform has automatic overload and overcurrent protection measures, the leakage current protector only trips the power after leakage occurs. Although the leakage current is in the milliampere range, it has already caused discomfort and harm to the human body. Utility Model Content

[0004] The purpose of this utility model is to solve the problems existing in the prior art by proposing a physical electricity teaching experimental platform.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A physics electrical teaching experimental platform includes an experimental table, an experimental platform on the tabletop, a tabletop baffle, and an electrical instrument storage box at the bottom of the experimental table. The tabletop baffle is characterized by: the tabletop baffle being 150-200 mm higher than the experimental platform, semi-enclosing it; a main power switch, an AC power indicator light, an AC power socket, an AC voltmeter, a DC power output terminal block, a DC voltmeter, a DC voltage output adjustment knob, and a DC power overload / short circuit alarm are sequentially arranged on the tabletop baffle; the electrical instrument storage box is divided into left and right parts; the right part is a drawer structure; the left part is a shelf structure; the bottom shelf of the left part houses an isolation transformer and an adjustable DC regulated power supply; the primary and secondary winding ratio of the isolation transformer is 1:1; the input of the isolation transformer is connected to a 220V AC power supply via the main power switch on the tabletop baffle, and the output of the isolation transformer is connected to the AC power socket on the tabletop baffle via an overcurrent protection relay. The adjustable DC regulated power supply is powered from the output of the aforementioned isolation transformer; the voltage adjustment knob of the adjustable DC regulated power supply is mounted on the tabletop baffle; the positive and negative output terminals of the adjustable DC regulated power supply are connected to the positive and negative terminals on the tabletop baffle via an overload and short circuit protection device; the overload and short circuit protection device is connected to an overload and short circuit alarm; and a DC voltmeter is connected in parallel between the positive and negative terminals.

[0006] The isolation transformer has a copper foil shielding layer between its primary and secondary windings, and the copper foil shielding layer is connected to the grounding device through a 1.5 square millimeter braided soft copper lead.

[0007] The beneficial effects of using this utility model.

[0008] 1. The electrical instrument storage box on the right side of this utility model has a drawer structure for storing connecting wires, electrical tools and loose small parts of the instrument; the electrical instrument storage box on the left side has a shelf structure for storing electrical instruments with a larger overall volume; thus, it is convenient to store electrical instruments and loose small parts on the tabletop.

[0009] 2. This utility model does not use a leakage current protection device. Instead, it selects an isolation transformer and connects a copper foil shielding layer between the primary and secondary windings of the isolation transformer. This achieves complete physical isolation between the power supply to the student's experimental platform and the mains power, avoiding the discomfort and harm to the human body caused by the leakage current protection device which only cuts off the power after leakage occurs.

[0010] 3. This utility model is convenient and flexible, meeting the requirements of electrical experiments in physics. It is safe and convenient to use, with good automatic overload and overcurrent protection measures, making it an essential experimental device for modern physics laboratories. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a physics electricity teaching experimental platform proposed in this utility model.

[0012] Figure 2 This is a schematic diagram of the circuit principle structure of a physics electricity teaching experimental platform proposed in this utility model.

[0013] The diagram is labeled as follows: 1. Experimental table; 2. Experimental platform; 3. Tabletop baffle; 4. Main power switch; 5. AC power indicator light; 6. AC power socket; 7. AC voltmeter; 8. DC power output positive and negative terminals; 9. DC voltmeter; 10. DC voltage output adjustment knob; 11. Overload and short circuit alarm; 12. Electrical instrument storage box (right side); 13. Electrical instrument storage box (left side); 14. Isolation transformer; 15. Adjustable DC regulated power supply; 16. Overcurrent protection relay; 17. Overload and short circuit protection device; 18. Copper foil shielding layer. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1 As shown, a physics electrical teaching experimental platform includes an experimental table 1, an experimental platform 2 on the tabletop, a tabletop baffle 3, and an electrical instrument storage box under the experimental table. The tabletop baffle 3 is 150-200 mm higher than the experimental platform 2, forming a semi-enclosed state. The tabletop baffle 3 is equipped with, in sequence, a main power switch 4, an AC power indicator light 5, an AC power socket 6, an AC voltmeter 7, DC power output positive and negative terminals 8, a DC voltmeter 9, a DC voltage output adjustment knob 10, and an overload / short circuit alarm 11. The electrical instrument storage box is divided into left and right parts. The right part, 12, is a drawer structure for storing connecting wires, electrical tools, and loose small instruments. The left part, 13, is a shelf structure for storing larger electrical instruments. The bottom shelf of the left part, 13, houses a 1000-1500 cubic meter electrical instrument. W's isolation transformer 14 and an adjustable DC regulated power supply 15.

[0016] like Figure 2 As shown, the turns ratio of the primary winding and the secondary winding of the isolation transformer 14 is 1:1; the input terminal of the isolation transformer 14 is connected to a 220V AC power supply through the main power switch 4 on the platform baffle 3, and the output terminal of the isolation transformer 14 is connected to the AC power socket 6 on the platform baffle 3 through the overcurrent protection relay 16. The adjustable DC regulated power supply 15 is powered by the output of the isolation transformer 14. The voltage adjustment knob of the adjustable DC regulated power supply 15 is mounted on the tabletop baffle 3. The positive and negative output terminals of the adjustable DC regulated power supply 15 are connected to the positive and negative DC power output terminals 8 on the tabletop baffle 3 through an overload and short circuit protection device 17. An overload and short circuit alarm 11 is connected to the overload and short circuit protection device 17. A DC voltmeter 9 is also connected in parallel between the positive and negative DC power output terminals 8.

[0017] Furthermore, an AC power indicator light 5 is connected in parallel to the input terminal of the isolation transformer 14, and an AC voltmeter 7 is connected in parallel to the output terminal of the isolation transformer 14.

[0018] Furthermore, a copper foil shielding layer 18 is connected between the primary winding and the secondary winding of the isolation transformer 14, and the copper foil shielding layer 18 is externally connected to the grounding device through a 1.5 square millimeter braided soft copper lead.

[0019] Furthermore, the overload and short circuit alarm 11 can determine the on-site usage conditions and issue two different alarm sounds: overload or short circuit.

[0020] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A physics electricity teaching experimental platform, comprising an experimental table (1), an experimental platform (2) on the tabletop, a tabletop baffle (3), and an electrical instrument storage box under the experimental table; characterized in that: The tabletop baffle (3) is 150-200mm higher than the experimental platform (2), forming a semi-enclosed state of the experimental platform (2); the tabletop baffle (3) is equipped with the following components in sequence: main power switch (4), AC power indicator light (5), AC power socket (6), AC voltmeter (7), DC power output positive and negative terminals (8), DC voltmeter (9), DC voltage output adjustment knob (10), and overload and short circuit alarm (11); the electrical instrument storage box is divided into left and right parts; the right part of the electrical instrument storage box (12) is a drawer structure; the left part of the electrical instrument storage box (13) is a shelf structure; the bottom space of the left part of the electrical instrument storage box (13) is equipped with an isolation transformer (14) with a capacity of 1000-1500 W and an adjustable DC regulated power supply (15). The ratio of the primary winding to the secondary winding of the isolation transformer (14) is 1:1; the input terminal of the isolation transformer (14) is connected to a 220V AC power supply through the main power switch (4) on the table baffle (3); the output terminal of the isolation transformer (14) is connected to the AC power socket (6) on the table baffle (3) through the overcurrent protection relay (16). The power supply of the adjustable DC regulated power supply (15) is taken from the output terminal of the isolation transformer (14); the voltage adjustment knob of the adjustable DC regulated power supply (15) is installed on the table baffle (3); the positive and negative output terminals of the adjustable DC regulated power supply (15) are connected to the positive and negative DC power output terminals (8) on the table baffle (3) through the overload and short circuit protection device (17); the overload and short circuit protection device (17) is connected to an overload and short circuit alarm (11); a DC voltmeter (9) is also connected in parallel between the positive and negative DC power output terminals (8).

2. The physics electricity teaching experimental platform according to claim 1, characterized in that: An AC power indicator light (5) is connected in parallel to the input terminal of the isolation transformer (14), and an AC voltmeter (7) is connected in parallel to the output terminal of the isolation transformer (14).

3. The physics electricity teaching experimental platform according to claim 1, characterized in that: A copper foil shielding layer (18) is connected between the primary winding and the secondary winding of the isolation transformer (14), and the copper foil shielding layer (18) is connected to the ground device through a 1.5 square braided soft copper lead.

4. The physics electricity teaching experimental platform according to claim 1, characterized in that: The overload and short circuit alarm (11) can determine the on-site usage and issue two different alarm sounds: overload or short circuit.

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