CN215408075U - Non-contact one-way electromagnetic door closer control circuit - Google Patents
Non-contact one-way electromagnetic door closer control circuit Download PDFInfo
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- CN215408075U CN215408075U CN202121743693.5U CN202121743693U CN215408075U CN 215408075 U CN215408075 U CN 215408075U CN 202121743693 U CN202121743693 U CN 202121743693U CN 215408075 U CN215408075 U CN 215408075U
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Abstract
The utility model relates to a non-contact one-way electromagnetic door closer control circuit which comprises a rectifying circuit, a key control circuit, a magnetic induction switch control circuit and a driving circuit, wherein the rectifying circuit is electrically connected with an external alternating current power supply, the rectifying circuit is electrically connected with the key control circuit, the key control circuit is electrically connected with the magnetic induction switch control circuit, the magnetic induction switch control circuit is electrically connected with the driving circuit, and the driving circuit is electrically connected with an electromagnet. When the door is manually pushed and opened and the sliding block and the magnet are driven to move to the limiting position, the magnetic induction switch control circuit is conducted and charges the driving circuit, after the key control circuit is pressed down, the key control circuit is opened, the driving circuit discharges electricity and drives the electromagnet to act, so that the door is automatically closed, the whole circuit does not need to be electrified for a long time to organize the hydraulic device to automatically close the door, the power consumption of the whole circuit is reduced, the non-contact type magnetic induction switch control circuit avoids mechanical abrasion, the reliability of the whole door closer is enhanced, and the service life is greatly prolonged.
Description
Technical Field
The utility model relates to the technical field of security equipment, in particular to a non-contact one-way electromagnetic door closer control circuit.
Background
The door closer is used as a common security component and a matching component of a safety door, and is widely applied to passages of various houses, office buildings and markets, the existing door closer needs to be electrified for a long time to keep electromagnetic force, so that the limiting device is started, the hydraulic device is prevented from automatically closing the door, the power consumption of an electromagnet of the door closer is large, a circuit is very complex, the door closer is inconvenient to assemble, the production cost is high, and the process is complex. In addition, in the existing door closer circuit, a contact switch is adopted, mechanical abrasion exists when the door is opened and closed every time, so that the reliability of the whole door closer is influenced after the time is long, and the service life is greatly reduced.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a non-contact one-way electromagnetic door closer control circuit, aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a non-contact one-way electromagnetism door closer control circuit, includes rectifier circuit, button control circuit, magnetic induction switch control circuit and drive circuit, rectifier circuit's input is connected with outside alternating current power supply electricity, rectifier circuit's output with button control circuit's input electricity is connected, button control circuit's output with magnetic induction switch control circuit's input electricity is connected, magnetic induction switch control circuit's output with drive circuit's input electricity is connected, drive circuit's output and electro-magnet electricity are connected, open the door after to the limiting position manually magnetic induction switch control circuit is closed, pass through when closing the door button control circuit control drive circuit drive electro-magnet action to make door self-closing.
The utility model has the beneficial effects that: the non-contact one-way electromagnetic door closer control circuit of the utility model rectifies the input alternating current by the rectifying circuit and then converts the rectified alternating current into direct current for supplying power, when the door is manually pushed and the slide block and the magnet are driven to move to the limit position, the magnetic induction switch control circuit is conducted and charges the driving circuit, when the key control circuit is pressed down, the key control circuit is opened, the drive circuit discharges electricity and drives the electromagnet to act, so that the door can be automatically closed, the whole circuit does not need to be electrified for a long time to organize the hydraulic device to automatically close the door, the power consumption of the whole circuit is greatly reduced, and the non-contact magnetic induction switch control circuit avoids mechanical abrasion, enhances the reliability of the whole door closer, greatly prolongs the service life, has simple circuit structure and low cost, is convenient to assemble and produce in batches, and is convenient to install and use.
On the basis of the technical scheme, the utility model can be further improved as follows:
further: rectifier circuit includes rectifier bridge chip DB1 and adjustable circuit R4, two alternating current input ends of rectifier bridge chip DB1 correspond the electricity with outside alternating current power supply's positive negative pole respectively and are connected, be connected with between rectifier bridge chip DB 1's the positive input end of alternating current and the negative input end of alternating current adjustable circuit R4, rectifier bridge chip DB 1's positive output of direct current with key control circuit's input electricity is connected, rectifier bridge chip DB 1's direct current negative output end ground connection.
The beneficial effects of the further scheme are as follows: the rectifier bridge chip DB1 can rectify external alternating voltage and form direct current voltage signals, and the direct current voltage signals are output to the key control circuit, so that the driving circuit is conveniently powered.
Further: the rectifier bridge chip DB1 is a rectifier bridge chip with the model of MB 6S.
Further: the key control circuit comprises a capacitor C2, a switch SW1, a resistor R5 and a triode T1, wherein the output end of the rectifying circuit is electrically connected with the collector electrode of the triode T1, the resistor R5 is electrically connected between the collector electrode and the base electrode of the triode T1, the collector electrode of the triode T1 is grounded through the capacitor C2, the switch SW1 is electrically connected between the base electrode of the triode T1 and the ground, and the emitter electrode of the triode T1 is electrically connected with the input end of the driving circuit as the output end.
The beneficial effects of the further scheme are as follows: when the door is pushed manually and the slider and the magnet are driven to move to the limiting position, the magnetic induction switch control circuit is conducted, the driving circuit is charged, and when the switch SW1 is closed, the collector electrode and the emitter electrode of the triode T1 are disconnected, so that the driving circuit is powered off, the driving circuit drives the electromagnet to act in the discharging process, the door is automatically closed, the whole circuit does not need to be kept in the power-on state in most of time, and the power consumption of the whole circuit is greatly reduced.
Further: the magnetic induction switch control circuit comprises a resistor R8, a resistor R9, a magnetic switch sensor chip U3, a triode Q3, a resistor R11, a resistor R10 and a MOS tube U2, wherein the resistor R9 and the resistor R8 are sequentially connected in series between the output end of the key control circuit and the ground, the common end of the resistor R9 and the resistor R8 is electrically connected with the input end of the magnetic switch sensor chip U3, the grounding end of the magnetic switch sensor chip U3 is grounded, the output end of the magnetic switch sensor chip U3 is electrically connected with the base of the triode Q3, the collector of the triode Q3 is electrically connected with the output end of the key control circuit, the emitter of the triode Q3 is grounded through the resistor R10, the emitter of the triode Q3 is electrically connected with the gate of the MOS tube U2, the source of the MOS tube U2 is electrically connected with the output end of the key control circuit, the drain of the MOS tube U2 is electrically connected with the input end of the drive circuit as the output end, and when the door is manually pushed, the door drives the sliding block and the magnet to move to the position corresponding to the magnetic switch sensor chip U3, the magnetic switch sensor chip U3 senses the magnet and starts, the input end and the output end of the magnetic switch sensor chip U3 are conducted, and the sliding block is driven to be clamped in the limiting position.
The beneficial effects of the further scheme are as follows: the voltage is divided through the resistor R8 and the resistor R9, the divided voltage VCC is used as an input end of the magnetic switch sensor chip U3, a sliding block can be driven to be communicated with a magnet to move according to the movement of a door, so that the switch sensor chip U3 is turned off, the MOS tube U2 is turned on, the driving circuit is charged, the driving circuit is powered off when the switch SW1 is pressed down to close the key control circuit, the discharging is carried out, a door closing signal is output, an electromagnet is driven to act, the resistance of the hydraulic device for automatically closing the door is eliminated, and the door is automatically closed.
When the door is not pushed to the limit position, the magnetic switch sensor chip U3 does not sense a magnet, the magnetic switch sensor chip U3 is conducted, the output voltage VCC is output to the triode Q3, the triode Q3 is conducted, so that the gate of the MOS tube U2 generates a high level, at the moment, the triode U2 is cut off, the driving circuit does not work, when the door is pushed to the limit position, the slider drives the magnet to move to the position corresponding to the magnetic switch sensor chip U3, the magnetic switch sensor chip U3 senses the magnet and is disconnected, the base of the triode Q3 is in a low level state, the triode Q3 is turned off, so that the gate of the MOS tube U2 generates a low level, at the moment, the triode U2 is conducted, the driving circuit works, and the charging is started.
Further: the driving circuit comprises a resistor R1, a resistor R7, a triode Q2, a resistor R3, a light emitting diode H1, a diode D1, a resistor R6, a capacitor C1, a capacitor C3, a resistor R2 and a MOS tube U1, wherein the output end of the magnetic induction switch control circuit is electrically connected with the base electrode of the triode Q2 through the resistor R1, the output end of the magnetic induction switch control circuit is electrically connected with the collector electrode of the triode Q2 through the resistor R7, the capacitor C3 and the resistor R2 are connected in parallel between the emitter electrode of the triode Q2 and the ground, the emitter electrode of the triode Q2 is electrically connected with the gate electrode of the MOS tube U1, the source electrode of the MOS tube U1 is electrically connected with the cathode electrode of the diode D1 through the resistor R6, the anode electrode of the diode D1 is electrically connected with the output end of the magnetic induction switch control circuit, and the output end of the magnetic induction switch control circuit is electrically connected with the anode electrode of the light emitting diode H1 through the resistor R3, the cathode of the light emitting diode H1 is grounded, the source of the MOS tube U1 is grounded through the capacitor C1, and the drain of the MOS tube U1 is electrically connected with the input end of the electromagnet as the output end.
The beneficial effects of the further scheme are as follows: when the magnetic induction switch control circuit is switched on and outputs voltage, the capacitor C1 of the driving circuit is charged, so that after the capacitor C1 is charged, when a door needs to be closed, the switch SW1 is closed, the key control circuit is switched off, the whole driving circuit is powered off, the capacitor C1 discharges electricity, the drain electrode of the MOS tube U1 discharges electricity and drives the electromagnet to act, the iron core of the electromagnet is separated from a limiting position, and the door is automatically closed under the action of a hydraulic device, so that the magnetic induction switch control circuit is simple in structure, low in power consumption and low in cost; the manual limiting is more reliable.
Drawings
Fig. 1 is a schematic structural diagram of a non-contact one-way electromagnetic door closer control circuit according to an embodiment of the present invention;
fig. 2 is a circuit schematic diagram of a non-contact one-way electromagnetic door closer control circuit according to an embodiment of the utility model.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1, a non-contact one-way electromagnetic door closer control circuit comprises a rectifying circuit, a key control circuit, a magnetic induction switch control circuit and a driving circuit, wherein an input end of the rectifying circuit is electrically connected with an external alternating current power supply, an output end of the rectifying circuit is electrically connected with an input end of the key control circuit, an output end of the key control circuit is electrically connected with an input end of the magnetic induction switch control circuit, an output end of the magnetic induction switch control circuit is electrically connected with an input end of the driving circuit, an output end of the driving circuit is electrically connected with an electromagnet, the magnetic induction switch control circuit is closed after a door is manually opened to a limit position, and the driving circuit drives the electromagnet to act through the key control circuit when the door is closed, so that the door is automatically closed.
The non-contact one-way electromagnetic door closer control circuit of the utility model rectifies the input alternating current by the rectifying circuit and then converts the rectified alternating current into direct current for supplying power, when the door is manually pushed and the slide block and the magnet are driven to move to the limit position, the magnetic induction switch control circuit is conducted and charges the driving circuit, when the key control circuit is pressed down, the key control circuit is opened, the drive circuit discharges electricity and drives the electromagnet to act, so that the door can be automatically closed, the whole circuit does not need to be electrified for a long time to organize the hydraulic device to automatically close the door, the power consumption of the whole circuit is greatly reduced, and the non-contact magnetic induction switch control circuit avoids mechanical abrasion, enhances the reliability of the whole door closer, greatly prolongs the service life, has simple circuit structure and low cost, is convenient to assemble and produce in batches, and is convenient to install and use.
In one or more embodiments of the present invention, as shown in fig. 2, the rectifier circuit includes a rectifier bridge chip DB1 and an adjustable circuit R4, two ac input terminals of the rectifier bridge chip DB1 are electrically connected to the positive and negative terminals of an external ac power source, the adjustable circuit R4 is electrically connected between an ac positive input terminal and an ac negative input terminal of the rectifier bridge chip DB1, a dc positive output terminal of the rectifier bridge chip DB1 is electrically connected to the input terminal of the key control circuit, and a dc negative output terminal of the rectifier bridge chip DB1 is grounded. The rectifier bridge chip DB1 can rectify external alternating voltage and form direct current voltage signals, and the direct current voltage signals are output to the key control circuit, so that the driving circuit is conveniently powered.
Optionally, in one or more embodiments of the present invention, the rectifier bridge chip DB1 is a rectifier bridge chip with a model number MB 6S.
In one or more embodiments of the present invention, the key control circuit includes a capacitor C2, a switch SW1, a resistor R5, and a transistor T1, an output end of the rectification circuit is electrically connected to a collector of the transistor T1, the resistor R5 is electrically connected between a collector and a base of the transistor T1, a collector of the transistor T1 is grounded through the capacitor C2, the switch SW1 is electrically connected between a base of the transistor T1 and ground, and an emitter of the transistor T1 is electrically connected as an output end to an input end of the driving circuit. When the door is pushed manually and the slider and the magnet are driven to move to the limiting position, the magnetic induction switch control circuit is conducted, the driving circuit is charged, and when the switch SW1 is closed, the collector electrode and the emitter electrode of the triode T1 are disconnected, so that the driving circuit is powered off, the driving circuit drives the electromagnet to act in the discharging process, the door is automatically closed, the whole circuit does not need to be kept in the power-on state in most of time, and the power consumption of the whole circuit is greatly reduced.
In one or more embodiments of the present invention, the magnetic induction switch control circuit includes a resistor R8, a resistor R9, a magnetic switch sensor chip U3, a transistor Q3, a resistor R11, a resistor R10, and a MOS tube U2, the resistor R9 and the resistor R8 are sequentially connected in series between the output terminal of the key control circuit and the ground, a common terminal of the resistor R9 and the resistor R8 is electrically connected to the input terminal of the magnetic switch sensor chip U3, a ground terminal of the magnetic switch sensor chip U3 is grounded, an output terminal of the magnetic switch sensor chip U3 is electrically connected to a base of the transistor Q3, a collector of the transistor Q3 is electrically connected to the output terminal of the key control circuit, an emitter of the transistor Q3 is grounded via the resistor R10, an emitter of the transistor Q3 is electrically connected to a gate of the MOS tube U2, a source of the MOS tube U2 is electrically connected to the output terminal of the key control circuit, the drain electrode of the MOS tube U2 is used as an output end and is electrically connected with the input end of the driving circuit, when the door is manually pushed, the door drives the sliding block and the magnet to move to the position corresponding to the magnetic switch sensor chip U3, the magnetic switch sensor chip U3 senses the magnet and starts, the input end and the output end of the magnetic switch sensor chip U3 are conducted, and meanwhile the sliding block is driven to be clamped into a limiting position. The voltage is divided through the resistor R8 and the resistor R9, the divided voltage VCC is used as an input end of the magnetic switch sensor chip U3, a sliding block can be driven to be communicated with a magnet to move according to the movement of a door, so that the switch sensor chip U3 is turned off, the MOS tube U2 is turned on, the driving circuit is charged, the driving circuit is powered off when the switch SW1 is pressed down to close the key control circuit, the discharging is carried out, a door closing signal is output, an electromagnet is driven to act, the resistance of the hydraulic device for automatically closing the door is eliminated, and the door is automatically closed.
In one or more embodiments of the present invention, the driving circuit includes a resistor R1, a resistor R7, a transistor Q2, a resistor R3, a light emitting diode H1, a diode D1, a resistor R6, a capacitor C1, a capacitor C3, a resistor R2, and a MOS tube U1, an output end of the magnetic induction switch control circuit is electrically connected to a base of the transistor Q2 through the resistor R1, an output end of the magnetic induction switch control circuit is electrically connected to a collector of the transistor Q2 through the resistor R7, the capacitor C3 and the resistor R2 are connected in parallel between an emitter of the transistor Q2 and the ground, an emitter of the transistor Q2 is electrically connected to a gate of the MOS tube U1, a source of the MOS tube U1 is electrically connected to a cathode of the diode D1 through the resistor R6, an anode of the diode D1 is electrically connected to an output end of the magnetic induction switch control circuit, and an output end of the magnetic induction switch control circuit is electrically connected to an anode of the light emitting diode H1 through the resistor R3 The cathode of the light emitting diode H1 is grounded, the source of the MOS tube U1 is grounded through the capacitor C1, and the drain of the MOS tube U1 is electrically connected with the input end of the electromagnet as the output end. When the magnetic induction switch control circuit is switched on and outputs voltage, the capacitor C1 of the driving circuit is charged, so that after the capacitor C1 is charged, when a door needs to be closed, the switch SW1 is closed, the key control circuit is switched off, the whole driving circuit is powered off, the capacitor C1 discharges electricity, the drain electrode of the MOS tube U1 discharges electricity and drives the electromagnet to act, the iron core of the electromagnet is separated from a limiting position, and the door is automatically closed under the action of a hydraulic device, so that the magnetic induction switch control circuit is simple in structure, low in power consumption and low in cost; the manual limiting is more reliable.
The utility model relates to a control circuit of a one-way electromagnet door closer, which has the working principle that:
specifically, when the door is not pushed to the limit position, the magnetic switch sensor chip U3 does not sense a magnet, the magnetic switch sensor chip U3 is turned on, and the output voltage VCC is up to the triode Q3, and the triode Q3 is turned on, so that the gate of the MOS transistor U2 generates a high level, at this time, the triode U2 is turned off, the driving circuit does not work, when the door is pushed to the limit position, the slider drives the magnet (the magnet placed in the slider) to move to the position corresponding to the magnetic switch sensor chip U3, the magnetic switch sensor chip U3 senses the magnet and is turned off, the base of the triode Q3 is in a low level state, the triode Q3 is turned off, so that the gate of the MOS transistor U2 generates a low level, at this time, the triode U2 is turned on, the driving circuit works, and the capacitor C1 starts to charge. When the door needs to be closed, the switch SW1 is pressed, the collector and the emitter of the triode T1 are disconnected, the driving circuit is powered off, the capacitor C1 starts to discharge, the current at the output end of the drain electrode of the MOS tube U1 drives the iron core of the electromagnet to act, the iron core of the electromagnet is separated from the limiting position, the door is automatically closed under the action of a hydraulic device, the electromagnet acts in a single direction, the structure is simple, the power consumption is low, and the cost is low; the manual limiting is more reliable.
According to the non-contact one-way electromagnet door closer control circuit, the current of the circuit can be reduced to 0.8mA, the power consumption of the whole circuit is greatly reduced, the limiting can be performed more stably in a manual limiting mode, the existing contact type microswitch is optimized, when the sliding block moves to the limiting position, the magnetic induction switch starts to work after sensing a magnet, and the capacitor is charged, so that the structure and the circuit can be better optimized, the manual limiting is firmer, the door can be automatically closed after power failure, the production cost is greatly reduced, the electromagnet performs one-way action, the circuit structure is simple, the action is sensitive, and the reliable action can be performed for 10 ten thousand times through a durability test.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides a one-way electromagnetism door closer control circuit of non-contact which characterized in that: including rectifier circuit, button control circuit, magnetic induction switch control circuit and drive circuit, rectifier circuit's input is connected with outside alternating current power supply electricity, rectifier circuit's output with button control circuit's input electricity is connected, button control circuit's output with magnetic induction switch control circuit's input electricity is connected, magnetic induction switch control circuit's output with drive circuit's input electricity is connected, drive circuit's output is connected with the electro-magnet electricity, opens the door after limiting position manually magnetic induction switch control circuit is closed, passes through when closing the door drive circuit drive electro-magnet action to make door self-closing.
2. The non-contact one-way electromagnetic door closer control circuit of claim 1, wherein: rectifier circuit includes rectifier bridge chip DB1 and adjustable circuit R4, two alternating current input ends of rectifier bridge chip DB1 correspond the electricity with outside alternating current power supply's positive negative pole respectively and are connected, be connected with between rectifier bridge chip DB 1's the positive input end of alternating current and the negative input end of alternating current adjustable circuit R4, rectifier bridge chip DB 1's positive output of direct current with key control circuit's input electricity is connected, rectifier bridge chip DB 1's direct current negative output end ground connection.
3. The non-contact one-way electromagnetic door closer control circuit of claim 2, wherein: the rectifier bridge chip DB1 is a rectifier bridge chip with the model of MB 6S.
4. The non-contact one-way electromagnetic door closer control circuit of claim 1, wherein: the key control circuit comprises a capacitor C2, a switch SW1, a resistor R5 and a triode T1, wherein the output end of the rectifying circuit is electrically connected with the collector electrode of the triode T1, the resistor R5 is electrically connected between the collector electrode and the base electrode of the triode T1, the collector electrode of the triode T1 is grounded through the capacitor C2, the switch SW1 is electrically connected between the base electrode of the triode T1 and the ground, and the emitter electrode of the triode T1 is electrically connected with the input end of the driving circuit as the output end.
5. The non-contact one-way electromagnetic door closer control circuit of claim 1, wherein: the magnetic induction switch control circuit comprises a resistor R8, a resistor R9, a magnetic switch sensor chip U3, a triode Q3, a resistor R11, a resistor R10 and a MOS tube U2, wherein the resistor R9 and the resistor R8 are sequentially connected in series between the output end of the key control circuit and the ground, the common end of the resistor R9 and the resistor R8 is electrically connected with the input end of the magnetic switch sensor chip U3, the grounding end of the magnetic switch sensor chip U3 is grounded, the output end of the magnetic switch sensor chip U3 is electrically connected with the base of the triode Q3, the collector of the triode Q3 is electrically connected with the output end of the key control circuit, the emitter of the triode Q3 is grounded through the resistor R10, the emitter of the triode Q3 is electrically connected with the gate of the MOS tube U2, the source of the MOS tube U2 is electrically connected with the output end of the key control circuit, the drain of the MOS tube U2 is electrically connected with the input end of the drive circuit as the output end, and when the door is manually pushed, the door drives the sliding block and the magnet to move to the position corresponding to the magnetic switch sensor chip U3, the magnetic switch sensor chip U3 senses the magnet and starts, the input end and the output end of the magnetic switch sensor chip U3 are conducted, and the sliding block is driven to be clamped in the limiting position.
6. The non-contact one-way electromagnetic door closer control circuit of claim 1, wherein: the driving circuit comprises a resistor R1, a resistor R7, a triode Q2, a resistor R3, a light emitting diode H1, a diode D1, a resistor R6, a capacitor C1, a capacitor C3, a resistor R2 and a MOS tube U1, wherein the output end of the magnetic induction switch control circuit is electrically connected with the base electrode of the triode Q2 through the resistor R1, the output end of the magnetic induction switch control circuit is electrically connected with the collector electrode of the triode Q2 through the resistor R7, the capacitor C3 and the resistor R2 are connected in parallel between the emitter electrode of the triode Q2 and the ground, the emitter electrode of the triode Q2 is electrically connected with the gate electrode of the MOS tube U1, the source electrode of the MOS tube U1 is electrically connected with the cathode electrode of the diode D1 through the resistor R6, the anode electrode of the diode D1 is electrically connected with the output end of the magnetic induction switch control circuit, and the output end of the magnetic induction switch control circuit is electrically connected with the anode electrode of the light emitting diode H1 through the resistor R3, the cathode of the light emitting diode H1 is grounded, the source of the MOS tube U1 is grounded through the capacitor C1, and the drain of the MOS tube U1 is electrically connected with the input end of the electromagnet as the output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121743693.5U CN215408075U (en) | 2021-07-29 | 2021-07-29 | Non-contact one-way electromagnetic door closer control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121743693.5U CN215408075U (en) | 2021-07-29 | 2021-07-29 | Non-contact one-way electromagnetic door closer control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215408075U true CN215408075U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121743693.5U Active CN215408075U (en) | 2021-07-29 | 2021-07-29 | Non-contact one-way electromagnetic door closer control circuit |
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| CN (1) | CN215408075U (en) |
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2021
- 2021-07-29 CN CN202121743693.5U patent/CN215408075U/en active Active
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