CN215565305U - Be applicable to two door magnetic switch circuits of normally closed door - Google Patents
Be applicable to two door magnetic switch circuits of normally closed door Download PDFInfo
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- CN215565305U CN215565305U CN202121599029.8U CN202121599029U CN215565305U CN 215565305 U CN215565305 U CN 215565305U CN 202121599029 U CN202121599029 U CN 202121599029U CN 215565305 U CN215565305 U CN 215565305U
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Abstract
The utility model discloses a double-door magnetic switch circuit suitable for normally closed doors, which comprises a communication module, a power supply module, a monitoring module, a control module and a state indication module, wherein the communication module and the monitoring module are connected with the control module, the communication module, the monitoring module and the control module are connected with the power supply module and then get electricity, the monitoring module is connected with the control module and then sends a feedback signal to the control module, the input end of the communication module is connected with a fourth wiring terminal, the communication module is connected with an external signal source through the fourth wiring terminal, and the output end of the communication module is connected with the power supply module.
Description
Technical Field
The utility model relates to the technical field of fire alarms, in particular to a magnetic switch circuit applicable to a normally closed double door.
Background
Along with rapid development of economy and science and technology, the density of urban personnel is continuously improved, when a fire disaster occurs, a fire source is rapidly isolated, the fire range is effectively controlled, and good conditions can be created for fighting the fire disaster and evacuating and escaping people. Therefore, fire partitions such as fire doors are widely used in fire protection design of building engineering, but due to unreasonable design, improper type selection, inadequate monitoring and the like, the fire doors cannot fully exert the isolation function, especially the existing fire doors are single door installed door magnets, and when a fire occurs, one door cannot completely isolate a fire source, so that the working states of two fire doors are monitored and controlled in real time, which is an important measure for preventing fire spreading and smoke diffusion, and therefore, a double-door fire door monitoring system is in operation. The door magnetic switch of the fireproof door in the system is internally provided with a pair of normally-open reed pipes, when the permanent magnet and the reed pipes are close to each other, for example, the distance between the permanent magnet and the reed pipes is less than 5 millimeters, the door magnetic sensor is in a working waiting state, and when the permanent magnet is away from the reed pipes for a certain distance, for example, the distance between the permanent magnet and the reed pipes is more than 5 millimeters, the door magnetic sensor is in a normally-open state.
The fire door in the prior art needs to be accessed into the system through an additional access module, so that the monitoring function is realized, the production process of the fire door is complex, the operation is unstable, and the overall manufacturing cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a magnetic switch circuit suitable for a normally closed double door, which aims to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a be applicable to two door magnetic switch circuits of normal close door, includes communication module, power module, monitoring module, control module and status indication module, its characterized in that: the communication module and the monitoring module are connected with the control module, the communication module, the monitoring module and the control module are connected with the power supply module and then get electricity, the monitoring module is connected with the control module and then sends a feedback signal to the control module, the input end of the communication module is connected with a fourth wiring terminal and is connected with an external signal source through the fourth wiring terminal, and the output end of the communication module is connected with the power supply module;
the monitoring module comprises a first reed pipe and a second reed pipe, the first reed pipe is connected with the control module through a first wiring terminal, and the second reed pipe is connected with the control module through a second wiring terminal;
the control module comprises a main control chip, the main control chip is a single chip microcomputer with fourteen pins, and the connection structure of each pin of the main control chip is as follows:
power pack pin:
the first pin is connected with the output end of the power supply module 200 to get electricity;
the fourth pin is grounded;
the fourteenth pin is grounded;
a crystal oscillation group pin:
the second pin is used for inputting level, with programmable level pull-up and pin level change interruption, and crystal oscillator input;
the third pin is used for inputting level, with programmable level pull-up and pin level change interruption, and outputting by a crystal oscillator;
input level group pin: the first pin, the second pin, the third pin, the fourth pin, the sixth pin, the seventh pin, the eighth pin, the ninth pin and the tenth pin are included;
the sixth pin is connected with the communication module and then acquires a switching signal generated by the communication module, and the switching signal is defined as an ANS pin;
the seventh pin is connected with the communication module and then acquires an amplification signal generated by the communication module, and the seventh pin is defined as a DAT pin;
the second indication unit LED2 of the ninth pin connection status indication unit 500;
the first indication unit LED1 of the tenth pin connection state indication unit 500;
comparator input pin: comprises an eleventh pin, a twelfth pin and a thirteenth pin,
the eleventh pin is a Schmitt trigger input level, and has programmable pull-up, pin change interruption and external interruption;
the twelfth pin is connected with the second reed pipe 2 of the monitoring module 300 to obtain a feedback signal, which is defined as an AD1 pin;
the thirteenth pin is connected with the first reed pipe 1 of the monitoring module 300 to obtain a feedback signal, which is defined as an AD0 pin;
in addition, a seventh capacitor C7 is connected between the first pin and the fourteenth pin.
And a twenty-fifth resistor R25 is connected between the first pin and the fourth pin.
Preferably, the fourth pin of the main control chip is grounded through an eighth capacitor.
Preferably, the first indicating unit of the status indicating module adopts a light emitting diode with a green light source color;
the second indicating unit adopts a light emitting diode with a yellow light source color.
Preferably, the communication module comprises a first transient voltage suppressor, a first rectifying unit, a switching signal generating unit, an amplified signal generating unit and a fourth connection terminal, the fourth connection terminal comprises a positive terminal and a negative terminal, wherein,
two ends of the first transient voltage suppressor are respectively left on two binding posts of the fourth binding post;
the input end of the first rectifying unit is connected to the two binding posts of the fourth wiring terminal, the output end of the first rectifying unit outputs rectifying signals, and the output end of the first rectifying unit is connected with the switching signal generating unit and the amplifying signal generating unit;
the output end of the switching signal generating unit is connected with the main control chip;
the output end of the amplification signal generation unit is connected with the main control chip;
preferably, the first rectifying unit is a diode rectifying bridge composed of four 1n4148 type switching diodes.
Preferably, the power supply module includes a first voltage stabilization unit and a second rectification unit, wherein,
the input end of the power supply module is connected with the rectification signal output end and the output end of the first rectification unit of the communication module to generate working voltage for the control module and the monitoring module to work;
the anode of the first voltage stabilizing unit is grounded, and the cathode of the first voltage stabilizing unit is connected with the input end of the second rectifying unit and the rectifying signal output end of the first rectifying unit of the communication module through a fourth triode;
the base electrode of the fourth triode is connected with the first voltage stabilizing unit, the emitting electrode of the fourth triode is connected with the input end of the second rectifying unit, and the collecting electrode of the fourth triode is connected with the rectifying signal output end of the first rectifying unit of the communication module;
the output end of the second rectifying unit generates working voltage for the control module and the monitoring module to work.
Preferably, the first voltage regulation unit adopts a voltage regulation diode.
Preferably, the second rectifying unit adopts an HT7133-1 type voltage stabilizing chip, which has three pins, wherein the three pins are set as: the first pin is grounded, the second pin is an input end of the first pin, and the third pin is an output end of the third pin.
Preferably, the monitoring module comprises a first reed switch, a second reed switch, a first connecting terminal and a second connecting terminal;
the first wiring terminal comprises a first wiring terminal and a second wiring terminal, two poles of the first reed switch are respectively connected to the two wiring terminals of the first wiring terminal, the first wiring terminal of the first wiring terminal is connected with the control module, and the second wiring terminal is grounded;
the first binding post of the first binding post is also connected with the output end of the power supply module through a thirteenth resistor;
the second connecting terminal comprises a first connecting terminal and a second connecting terminal, two poles of the second reed switch are respectively connected to the two connecting terminals of the second connecting terminal, the first connecting terminal of the second connecting terminal is connected with the control module, and the second connecting terminal is grounded;
the first binding post of the second binding post is also connected with the output end of the power supply module through a fourteenth resistor.
Compared with the prior art, the utility model has the beneficial effects that: the utility model simplifies the connection relation between circuits, has integrated design, low cost and stable operation, can simultaneously control two doors by adopting a double reed pipe structure, and further improves the fireproof effect.
Drawings
FIG. 1 is a schematic view of the structural connection of the present invention;
FIG. 2 is a schematic structural diagram of a communication module according to the present invention;
FIG. 3 is a schematic diagram of a control module according to the present invention;
FIG. 4 is a schematic diagram of a power module according to the present invention;
FIG. 5 is a schematic diagram of a monitoring module according to the present invention;
fig. 6 is a schematic structural diagram of a status indication module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the utility model provides a be applicable to two door magnetism switch circuits of normally closed door, including communication module 100, power module 200, monitoring module 300, control chip 400, status indication module 500, communication module 100 connects control chip 400, get the electricity after control chip 400 and monitoring module 300 connect power module 200, monitoring module 300 connects control chip 400 back and sends feedback signal to control chip 400, fourth binding post J4 is connected to communication module 100's input, connect external signal source through fourth binding post J4, in order to obtain external signal.
The output terminal of the communication module 100 is connected to the power module 200, so that the acquired external signal is transmitted to the power module 200, and then converted into the working voltage for the control chip 400 and the monitoring module 300.
The monitoring module 300 comprises a first reed switch 1 and a second reed switch 2, wherein the first reed switch 1 is connected with the control chip 400 through a first connecting terminal J1, and the second reed switch 2 is connected with the control chip 400 through a second connecting terminal J2.
In some embodiments, the power module 200 may output an operating voltage of + 3.3V.
In some embodiments, referring to fig. 1 and 2, the control chip 400 includes a main control chip U2, the main control chip U2 is a single chip with fourteen pins, and the connection structure of the pins of the main control chip U2 is as follows:
power pack pin:
the first pin is connected with the output end of the power supply module 200 to get electricity;
the fourth pin is grounded;
the fourteenth pin is grounded;
a crystal oscillation group pin:
the second pin is used for inputting level, with programmable level pull-up and pin level change interruption, and crystal oscillator input;
the third pin is used for inputting level, with programmable level pull-up and pin level change interruption, and outputting by a crystal oscillator;
input level group pin: the first pin, the second pin, the third pin, the fourth pin, the sixth pin, the seventh pin, the eighth pin, the ninth pin and the tenth pin are included;
in a preferred embodiment of the present invention,
the sixth pin is connected with the communication module and then acquires a switching signal generated by the communication module, and the switching signal is defined as an ANS pin;
in a preferred embodiment of the present invention,
the seventh pin is connected with the communication module and then acquires an amplification signal generated by the communication module, and the seventh pin is defined as a DAT pin;
in a preferred embodiment of the present invention,
the second indication unit LED2 of the ninth pin connection status indication unit 500;
in a preferred embodiment of the present invention,
the first indication unit LED1 of the tenth pin connection state indication unit 500;
comparator input pin: comprises an eleventh pin, a twelfth pin and a thirteenth pin,
the eleventh pin is a Schmitt trigger input level, and has programmable pull-up, pin change interruption and external interruption;
the twelfth pin is connected with the second reed pipe 2 of the monitoring module 300 to obtain a feedback signal, which is defined as an AD1 pin;
the thirteenth pin is connected with the first reed pipe 1 of the monitoring module 300 to obtain a feedback signal, which is defined as an AD0 pin;
in addition, a seventh capacitor C7 is connected between the first pin and the fourteenth pin.
And a twenty-fifth resistor R25 is connected between the first pin and the fourth pin.
In some preferred embodiments, the fourth pin of the main control chip U2 is grounded through an eighth capacitor C8.
In some preferred embodiments, the first indication unit LED1 is a light emitting diode with a green color, and the tenth pin of the main control chip U2 is connected to the first indication unit LED1 through a resistor R15.
In some preferred embodiments, the second indication unit LED2 is a yellow light emitting diode, and the nine pins of the main control chip U2 are connected to the second indication unit LED2 through a sixteenth resistor R16.
In some preferred embodiments, the main control chip U2 uses an MDT10F676 type single chip.
In some embodiments, referring to fig. 1 and 3, the communication module 100 includes a first transient voltage suppressor D1, a first rectifying unit, a switching signal generating unit, an amplifying signal generating unit, and a fourth connection terminal J4, the fourth connection terminal J4 includes a positive terminal and a negative terminal, wherein,
two ends of the first transient voltage suppressor D1 are respectively connected to two connection rods of the fourth connection terminal J4;
the input end of the first rectifying unit is connected to the two connecting rod posts of the fourth connecting terminal J4, the output end of the first rectifying unit outputs a rectifying signal S + +, and the output end of the first rectifying unit is connected with the switching signal generating unit and the amplifying signal generating unit;
the output end of the amplification signal generation unit is connected with a DAT pin of the main control chip U2. The amplification signal generation unit comprises a first triode Q1, the first triode Q1 is an NPN type triode, the base electrode of the triode is grounded through a fourth resistor R4, the emitter electrode of the triode is grounded, the collector electrode of the triode is used as the output end of the amplification signal generation unit and is connected with the seventh pin of the main control chip U2, the collector electrode of the triode is further connected with the power module 200 through a fifth resistor R5 to obtain electricity, the base electrode of the first triode Q1 is further connected with the positive output end of the first rectification unit through a third resistor R3, a second resistor R2 and a first capacitor C1, the base electrode of the triode Q1 is connected with the S + + signal output end, and a fourteenth capacitor C14 is connected to the third resistor R3 and the fourth resistor R4 in parallel;
the output end of the switching signal generating unit is connected with an ANS pin of the main control chip U2, the switching signal generating unit comprises a second triode Q2 and a third triode Q3, the second triode Q2 is an NPN type triode, the third triode Q3 is a PNP type triode, the base electrode of the second triode Q2 is connected with the sixth pin of the main control chip U2 through a sixth resistor R6, the collector electrode of the second triode Q2 is connected with the base electrode of the third triode Q3, and the transmitter is grounded through a third sixteen resistor R36; the transmitter of the third triode Q3 is connected to the S + + signal output terminal of the first rectifying unit through an eighth resistor R8, the collector is grounded through a sixteenth resistor R36, and the base of the second triode Q2 is also grounded through a seventh resistor R7.
In some preferred embodiments, the first rectifying unit is a diode rectifying bridge composed of four 1n4148 type switching diodes, the four 1n4148 type switching diodes are diode D1, diode D2, diode D3 and diode D4, the positive pole of the output end outputs S + + signal, and the negative pole is grounded.
In some preferred embodiments, the first transistor Q1, the second transistor Q2 are 3904 transistors, the third transistor Q3 is 5401 transistors, and the first transient voltage suppressor D1 is an SMBJ36CA transient suppressor diode.
In some embodiments, referring to fig. 1 and 4, the power module 200 includes a first voltage stabilizing unit D6 and a second rectifying unit U1, wherein an input end of the power module 200 is connected to a positive electrode (S + + output end) of a rectified signal output end of the first rectifying unit of the communication module 100, and an output end generates a working voltage for the control chip 400 and the monitoring module 300 to operate;
the positive electrode of the first voltage stabilizing unit D6 is grounded, and the negative electrode is connected to the input terminal (vin terminal) of the second rectifying unit U1 and the rectified signal output terminal (S + + output terminal) of the first rectifying unit of the communication module 100 through the fourth transistor Q4, and in addition, a third capacitor C3 is connected between the positive electrode and the negative electrode of the first voltage stabilizing unit D6;
the fourth triode Q4 is an NPN type triode, a base of the fourth triode Q4 is connected to a negative electrode of the first voltage stabilization unit D6, an emitter thereof is connected to an input terminal of the second rectification unit U1 through an eleventh resistor R11, a collector thereof is connected to a rectified signal output terminal (S + + output terminal) of the first rectification unit of the communication module 100 through a ninth resistor R9, and a tenth resistor R10 is connected between the collector and the base of the fourth triode Q4; the output terminal of the second rectifying unit U1 generates an operating voltage for the control chip 400 and the monitoring module 300 to operate.
In some preferred embodiments, the first voltage regulation unit D6 employs a zener diode.
In some preferred embodiments, the second regulator unit U1 is a HT7133-1 type regulator chip, which has three pins, including a first pin grounded, a second pin as its input, a third pin as its output, a fourth capacitor C4 between the first pin and the second pin, and a fifth capacitor C5 between the first pin and the third pin.
In some preferred embodiments, referring to fig. 1 and 5, the monitoring module 300 includes a first reed pipe 1, a second reed pipe 2, a first connection terminal J1 and a second connection terminal J2, the first connection terminal J1 includes a first terminal and a second terminal, two poles of the first reed pipe 1 are respectively connected to two terminals of the first connection terminal J1, the second connection terminal J2 includes a first terminal and a second terminal, two poles of the second reed pipe 2 are respectively connected to two terminals of the second connection terminal J2, the first terminal of the first connection terminal J1 is connected to an AD0 pin of a main control chip U2 of the control chip 400, the second terminal is grounded, and the first terminal of the second connection terminal J2 is connected to an AD1 pin of the main control chip U2 of the control chip 400 and the second grounded terminal;
the first terminal of the first connection terminal J1 is connected to the output terminal of the power module 200 through a thirteenth resistor R13 to obtain electricity, and a sixth capacitor C6 is connected between two terminals of the first connection terminal J1.
The first terminal of the second terminal J2 is connected to the output terminal of the power module 200 through a fourteenth resistor R14 to obtain power, and a ninth capacitor C9 is connected between two terminals of the second terminal J2.
The working principle is as follows: in operation, the fourth connection terminal J4 is connected to the communication module 100, the communication module 100 is connected to the control module 400, the communication module 100, the control module 400, and the monitoring module 300 are connected to the power module 200, the fourth connection terminal J4 provides a carrier signal for the communication module 100, the carrier signal is decoded in the communication module 100 and then provided to the control module 400, the control module 400 provides a driving signal for the status display module 500 to light the LED1, and the communication module 100 provides a voltage for the power module 200, the power module 200 reduces the voltage provided by the communication module 100 and then provides a working voltage for the monitoring module 300 and the control module 400, and the control module 400 detects a feedback signal from the monitoring module 300 and then provides a driving signal for the status display module 500 to light the LED 2.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a be applicable to two door magnetic switch circuits of normal close door, includes communication module, power module, monitoring module, control module and status indication module, its characterized in that: the communication module and the monitoring module are connected with the control module, the communication module, the monitoring module and the control module are connected with the power supply module and then get electricity, the monitoring module is connected with the control module and then sends a feedback signal to the control module, the input end of the communication module is connected with a fourth wiring terminal and is connected with an external signal source through the fourth wiring terminal, and the output end of the communication module is connected with the power supply module;
the monitoring module comprises a first reed pipe and a second reed pipe, the first reed pipe is connected with the control module through a first wiring terminal, and the second reed pipe is connected with the control module through a second wiring terminal;
the control module comprises a main control chip, the main control chip is a single chip microcomputer with fourteen pins, and the connection structure of each pin of the main control chip is as follows:
power supply pin group:
the first pin is connected with the power supply module and then gets electricity;
the fourth pin is grounded;
the fourteenth pin is grounded;
crystal oscillator pin group: comprises a second pin and a third pin,
the second pin is used for inputting level, with programmable level pull-up and pin level change interruption, and crystal oscillator input;
the third pin is used for inputting level, with programmable level pull-up and pin level change interruption, and outputting by a crystal oscillator;
input level pin group: comprises a fifth pin, a sixth pin, a seventh pin, an eighth pin, a ninth pin and a tenth pin,
the fifth pin is an input level pin;
the sixth pin is connected with the communication module and then acquires a switching signal generated by the communication module;
the seventh pin is connected with the communication module and then acquires an amplified signal generated by the device;
the ninth pin is connected with the first indicating unit of the state indicating module and used for indicating the working state;
the tenth pin is connected with a second indicating unit of the state indicating module and used for indicating the working state;
comparator input pin: comprises an eleventh pin, a twelfth pin and a thirteenth pin,
the eleventh pin is a Schmitt trigger input level, and has programmable pull-up, pin change interruption and external interruption;
the twelfth pin is connected with a second reed switch of the monitoring module and then acquires a monitoring signal;
the thirteenth pin is connected with a first reed switch of the monitoring module and then acquires a monitoring signal;
a seventh capacitor is connected between the first pin and the fourteenth pin;
a twenty-fifth resistor is connected between the first pin and the fourth pin;
the second pin, the third pin, the fifth pin, the eighth pin and the eleventh pin are vacant pins.
2. The magnetic switch circuit for the normally closed double door according to claim 1, wherein: and the fourth pin of the main control chip is grounded through an eighth capacitor.
3. The magnetic switch circuit for the normally closed double door according to claim 1, wherein: a first indicating unit of the state indicating module adopts a light emitting diode with a green light source color;
the second indicating unit adopts a light emitting diode with a yellow light source color.
4. The magnetic switch circuit for the normally closed double door according to claim 1, wherein: the communication module comprises a first transient voltage suppressor, a first rectifying unit, a switching signal generating unit, an amplifying signal generating unit and a fourth wiring terminal, wherein the fourth wiring terminal comprises a positive wiring terminal and a negative wiring terminal,
two ends of the first transient voltage suppressor are respectively left on two binding posts of a fourth binding post;
the input end of the first rectifying unit is connected to the two binding posts of the fourth wiring terminal, the output end of the first rectifying unit outputs rectifying signals, and the output end of the first rectifying unit is connected with the switching signal generating unit and the amplifying signal generating unit;
the output end of the switching signal generating unit is connected with the main control chip;
the output end of the amplification signal generation unit is connected with the main control chip.
5. The magnetic switch circuit for the normally closed double door according to claim 4, wherein: the first rectifying unit is a diode rectifying bridge consisting of four 1n4148 type switching diodes.
6. The magnetic switch circuit for the normally closed double door according to claim 1, wherein: the power supply module comprises a first voltage stabilizing unit and a second rectifying unit, wherein,
the input end of the power supply module is connected with the rectification signal output end and the output end of the first rectification unit of the communication module to generate working voltage for the control module and the monitoring module to work;
the positive electrode of the first voltage stabilizing unit is grounded, and the negative electrode of the first voltage stabilizing unit is connected with the input end of the second rectifying unit and the rectifying signal output end of the first rectifying unit of the communication module through a fourth triode;
the base electrode of the fourth triode is connected with the first voltage stabilizing unit, the emitting electrode of the fourth triode is connected with the input end of the second rectifying unit, and the collecting electrode of the fourth triode is connected with the rectifying signal output end of the first rectifying unit of the communication module;
and the output end of the second rectifying unit generates working voltage for the control module and the monitoring module to work.
7. The magnetic switch circuit for the normally closed double door according to claim 6, wherein: the first voltage stabilizing unit adopts a voltage stabilizing diode.
8. The magnetic switch circuit for the normally closed double door according to claim 7, wherein: the second rectifying unit adopts a three-terminal type voltage stabilizing module with +3.3v of output voltage, the three-terminal type voltage stabilizing module is provided with three pins, and the three pins are arranged as follows: the first pin is grounded, the second pin is an input end of the first pin, and the third pin is an output end of the third pin.
9. The magnetic switch circuit for the normally closed double door according to claim 1, wherein: the monitoring module comprises a first reed switch, a second reed switch, a first wiring terminal and a second wiring terminal;
the first wiring terminal comprises a first wiring terminal and a second wiring terminal, two poles of the first reed switch are respectively connected to the two wiring terminals of the first wiring terminal, and the first wiring terminal of the first wiring terminal is connected with the control module and the second wiring terminal is grounded;
the first binding post of the first binding post is also connected with the output end of the power supply module through a thirteenth resistor;
the second connecting terminal comprises a first connecting terminal and a second connecting terminal, two poles of the second reed switch are respectively connected to the two connecting terminals of the second connecting terminal, and the first connecting terminal of the second connecting terminal is connected with the control module and the second connecting terminal is grounded;
and the first binding post of the second binding post is also connected with the output end of the power supply module through a fourteenth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121599029.8U CN215565305U (en) | 2021-07-14 | 2021-07-14 | Be applicable to two door magnetic switch circuits of normally closed door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121599029.8U CN215565305U (en) | 2021-07-14 | 2021-07-14 | Be applicable to two door magnetic switch circuits of normally closed door |
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| CN215565305U true CN215565305U (en) | 2022-01-18 |
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| CN202121599029.8U Active CN215565305U (en) | 2021-07-14 | 2021-07-14 | Be applicable to two door magnetic switch circuits of normally closed door |
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