CN2441929Y - Electromagnetic lock monitor - Google Patents

Abstract

The utility model relates to an electromagnetic lock monitor, which comprises a door switch, a sucking coil and a power-off retaining circuit thereof, and is composed of a monitor sampling resistor, a bidirectional thyristor, an output resistor, two immediate and delay comparison circuits, an anti-misreport delay circuit and a pulse generating circuit, wherein, one end of the monitor sampling resistor is grounded and the other end is connected with one end of the sucking coil of an electromagnetic lock; one main terminal of the bidirectional thyristor is connected with the other end of the sucking coil and the other main terminal is an output end of the device; the output resistor is connected in series in a main loop of the bidirectional thyristor; the immediate and delay comparison circuits, the comparison voltage of which is provided by the monitor sampling resistor, are connected in parallel with a gate of the bidirectional thyristor. The utility model has the advantages of novel design, reliable monitoring, convenient installation and high performance value, and can improve the security performance of electromagnetic locks.

Description

The electromagnetic lock monitoring device

The utility model relates to the annex of lock, relates in particular to a kind of electromagnetic lock monitoring device.

Be widely used as building residence intercommunication security door, escape and the gate control system of safety, fire fighting device, be that the sucker that relies on electromagnetism to lock a door opens the door with discharging to close to the adhesive of force block, its the suction-combining force is limited, in easily being forced open the door by lawless person's tool using, sometimes can occur also that door is stuck, abnormal conditions such as the corrosion of lock body adhesive face, pickup and force block dislocation, cause the electromagnetic lock adhesive not gone up or suction obviously weakens, Men Wei is fastened or do not shut, have a strong impact on the theftproof performance that electromagnetism is locked a door.But there is not pair electromagnetic lock duty to carry out device for monitoring at present as yet.

The purpose of this utility model is to remedy the deficiencies in the prior art, proposes a kind of electromagnetic lock monitoring device.

The purpose of this utility model is achieved by the following technical programs.

This electromagnetic lock monitoring device, comprise the electromagnetic lock gate control circuit in, the outer door switch, electromagnetic lock sucker coil and outage holding circuit thereof is characterized in that the monitoring sample resistance that the other end is connected with an end of sucker coil by an end ground connection, one main terminal be connected with the other end of sucker coil and another main terminal be this device output bidirectional triode thyristor and be serially connected in the output resistance of its major loop, two provide comparative voltage parallel the instant of bidirectional triode thyristor gate pole and the time-delay comparison circuit of inserting by the monitoring sample resistance respectively, provide the pulse generating circuit of pulse current to form through amplifier of sucker coil blackout holding circuit to the sucker coil to the anti-wrong report delay circuit of the output power supply of time-delay comparison circuit with by its control.

The utility model is novel, and monitoring is reliable, and easy for installation, the performance value ratio is higher, and supporting interlink warning component groups becomes security system, can prevent a quilt sled effectively, Men Wei fastens or not close first-class abnormal conditions generation, improves the theftproof performance that electromagnetism is locked a door.

Accompanying drawing is circuit theory diagrams of the present utility model.Terminal VCC is+12 volts of dc power supply terminals, terminal OUT is the monitor signal output, in the frame of broken lines is part electromagnetic lock gate control circuit, wherein inside and outside closing and opening side doors S1, S2 adopt BH-1-2 type switch, the inductance of sucker coil L is 850 milihenries, and sucker coil blackout holding circuit is made up of charging capacitor C (4.7 microfarad), discharge resistance R1, comparison circuit IC1C (1/4 KM339) and triode VT1 (C1815), VT2 (A1013).

Below in conjunction with embodiment and contrast accompanying drawing the utility model is made an explanation.

Embodiment is made up of monitoring sample resistance R (2.7 Europe/3 watt), bidirectional triode thyristor SCR (97A6), output resistance R0 (4.7 kilo-ohms), instant comparison circuit IC1A (1/4 LM339), time-delay comparison circuit IC1B (1/4 LM339), anti-wrong report delay circuit IC2A, IC2B (CD4098) and pulse generating circuit IC3 (NE555).

When forcing open the door, sucker and force block moment disengagement, the variation of contact surface causes that the inductance value of sucker coil L reduces, and flows through the corresponding increase of DC current of sucker coil L and monitoring sample resistance R, and monitoring sample resistance R goes up the also corresponding increase of voltage, the PIN7 voltage of instant comparison circuit IC1A increases, the PIN1 of instant comparison circuit IC1A becomes high level, makes bidirectional triode thyristor SCR conducting, at this moment, switch triode VT2 is in conducting state, and monitor signal is exported from output resistance R0.

After opening door switch S1 or S2, set time-delay 20 ± 1 seconds, normally come in and go out for personnel.For preventing to send the monitor signal of wrong report during this period of time, be provided with anti-wrong report delay circuit IC2A, IC2B.Press door switch S1 or S2, sucker coil L outage, electromagnetic lock is opened, bidirectional triode thyristor SCR ends, dc source VCC charges to charging capacitor C through triode VT2, the PIN4 voltage of comparison circuit IC1C in the sucker coil blackout holding circuit is increased, the PIN2 of comparison circuit ICIC becomes low level, triode VT1, VT2 ends, at this moment, sucker coil L keeps outage, along with charging capacitor C discharged about 7 ± 1 seconds to discharge resistance R, the PIN4 voltage of comparison circuit IC1C is decreased to and is lower than PIN5 voltage, the PIN2 of comparison circuit IC1C becomes high level, triode VT1, the VT2 conducting, sucker coil L energising, with the said process while, the upper edge pulse of charging capacitor C charging is through anti-wrong report delay circuit IC2A, IC2B time-delay 20 ± 1 seconds, it at the PIN10 output pulse width of anti-wrong report delay circuit IC2B 3 seconds high level, make switch triode VT0 saturation conduction, both the output PIN14 to time-delay comparison circuit IC1B powered, limit this circuit only after opening the door 20 ± 1 seconds just to the output of monitoring sample resistance R carry out moment monitoring rate, to prevent wrong report, simultaneously provide power supply again to pulse generating circuit IC3, it is produced continue 3 seconds pulse signal, through being in the triode VT1 of conducting state, sucker coil L is flow through in the VT2 amplification, if a 20 ± second back door is not fastened for some reason or is not shut opening the door, the inductance value of sucker coil L will reduce, flow through the pulse current increase that sucker coil L continues 3 seconds, make monitoring sample resistance R go up the also corresponding increase of voltage, the PIN9 voltage of time-delay comparison circuit IC1B increases, and the PIN14 of time-delay comparison circuit IC1B is a high level by switch triode VT0 power supply, bidirectional triode thyristor SCR conducting, monitor signal is exported from output resistance R0.

In a word, the abnormal conditions that the 20 seconds back doors of occurring forcing open the door and open the door are not fastened or do not shut all will be exported monitor signal on the output resistance R0, be reported to the police by the interlink warning assembly of supporting employing.

Claims (1)

1, a kind of electromagnetic lock monitoring device, comprise the electromagnetic lock gate control circuit in, the outer door switch, electromagnetic lock sucker coil and outage holding circuit thereof is characterized in that the monitoring sample resistance that the other end is connected with an end of sucker coil by an end ground connection, one main terminal be connected with the other end of sucker coil and another main terminal be this device output bidirectional triode thyristor and be serially connected in the output resistance of its major loop, two provide comparative voltage parallel the instant of bidirectional triode thyristor gate pole and the time-delay comparison circuit of inserting by the monitoring sample resistance respectively, provide the pulse generating circuit of pulse current to form through amplifier of sucker coil blackout holding circuit to the sucker coil to the anti-wrong report delay circuit of the output power supply of time-delay comparison circuit with by its control.