CN2180975Y - Infrared ray electric interruptor controlling magnetic force balancing system - Google Patents

Abstract

The utility model discloses an infrared ray electric interruptor controlling magnetic force balancing system which is composed of a lever, a permanent magnetic steel, a coil, an infrared ray electric interruptor and an electronic circuit. When the external force acts on the stressing end of the lever, the lever offsets the equilibrium position to make the shading sheet on the resistance arm of the lever enter the infrared ray electric interruptor. The optical control circuit controls the switch circuit to automatically adjust the output voltage of the voltage regulating circuit. When the coil voltage is definite, the external force (moment) and the magnetic field force are balanced. The shading sheet returns to the equilibrium position. The voltage on the resistance which is strung in the coil is detected to find out the corresponding external force. The utility model is suitable for the instrument, the meter, the weighing and the pressure detecting systems.

Description

Infrared ray electric interruptor controlling magnetic force balancing system

The utility model is a kind of improved magnetic balanced system, can be applicable to instrument, instrument, weighs, in the system such as pressure detection.

Traditional magnetic balanced system all uses measurement external force such as condenser type, inductance type to act on displacement on the coil (or magnet).This mode can be brought additive error, and linearity is also poor, and tested analog quantity is passed through circuit modifications, the circuit complexity, and measuring accuracy is low, the cost height.

The purpose of this utility model is to provide a kind of magnetic balanced system that makes positioning balance point with the infrared ray interrupter.By this systematic survey external force (square), be not the displacement of magnetic test coil (or magnet), but the resistance from be serially connected in coil is obtained simulate amount and is shown with digital voltmeter.

The utility model is achieved in that lever resistance arm end is equipped with permanent-magnet steel and anti-dazzling screen, permanent-magnet steel is at the end face at coil, anti-dazzling screen is in the middle of two infrared electro interrupters, when external force acts on the lever stress arm, anti-dazzling screen enters the infrared electro interrupter, make circuit to coil charges, when being charged to certain voltage, magnetic field force can make lever get back to the equilibrium position, when external force diminishes, anti-dazzling screen enters another infrared electro interrupter, makes coil discharge by circuit, and lever is back to the equilibrium position.In coil, seal in a resistance,, directly measure ohmically voltage drop, just know the size of external force with digital voltmeter because of the size of magnetic field force is directly proportional with electric current.

The utility model good effect is that circuit is simple and reliable, and debugging is convenient, does not have linear error, and good reproducibility does not need correction circuit, the measuring accuracy height, and cost is low, is fit to produce in batches.

Below in conjunction with accompanying drawing the utility model is elaborated:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Shown in Fig. 1-2, anti-dazzling screen (4) and permanent-magnet steel (3) are housed on lever (1) resistance arm, and are contained on the support (2), infrared electro interrupter (5), (6), coil (7), zeroing gong nail (9) are contained on the frame.

When external force F act on lever (1) be subjected to the arm of force A point time, lever (1) skew equilibrium position, anti-dazzling screen (4) enters infrared electro interrupter (6), phototriode is ended, and make LM324(A) the amplifier conducting, open analog switching circuit 4016, noble potential charges to capacitor C by resistance, LM117 regulated power supply output voltage is raise, coil voltage also raises gradually, when coil magnetic field power greatly when permanent-magnet steel is pushed back the equilibrium position, phototriode recovers conducting again, making LM324(A) amplifier ends, at this moment, just can obtain aanalogvoltage by the resistance from be serially connected in coil, otherwise, anti-dazzling screen enters infrared electro interrupter (5) when external force diminishes, and make LM324(B) conducting, capacitor C will be discharged to earth potential by 4016 mimic channels, when lever (1) when getting back to the equilibrium position, LM324(B) amplifier is recovered to end, and total system can be returned to zero by zeroing gong nail (9) and extension spring (8).

Claims (3)

1, the magnetic balanced system of a kind of infrared electro interrupter control by: the lever (1), infrared electro interrupter (5), (6), coil (7) and zeroing gong nail (9), extension spring (8) and the circuit that are contained on the frame are formed, and it is characterized in that: permanent-magnet steel (3) and anti-dazzling screen (4) are housed on lever (1) resistance arm.

2,, it is characterized in that coil (7) discharges and recharges by anti-dazzling screen (4) to enter infrared electro interrupter (5) or (6) are controlled by circuit by the system of claim 1 regulation.

3, by the system of claim 1 regulation, it is characterized in that permanent-magnet steel (3) is at coil (7) end face.

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