Control circuit of automatic air door of coal mine well, automatic air door control box and ventilation system

Abstract

The utility model relates to a control circuit of an automatic air door of a coal mine well, an automatic air door control box and a ventilation system, the output end of a signal detection unit is connected with the input end of a switch control unit, the input end and the output end of the signal detection unit are both connected with a power supply, and the input end and the output end of the switch control unit are both connected with the power supply. The signal detection unit is arranged in the area of the automatic air door close to the first pedestrian door; the switch control unit is arranged in the area of the automatic air door close to the second pedestrian door; the signal detection unit is used for detecting a first signal representing that the first pedestrian door is in an open state and inputting the first signal into the switch control unit; and the switch control unit is used for controlling the second pedestrian door to be in a closed state when receiving the first signal. The situation that the first pedestrian door and the second pedestrian door are opened at the same time can be prevented, then the situation that airflow is short-circuited can be reduced, and meanwhile the risk of workers in a coal mine can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of control technologies, and in particular, to a control circuit for an automatic air door in a coal mine shaft, an automatic air door control box, and a ventilation system. Background Art

[0002] The automatic air door in a coal mine shaft is mainly a passage for automatically controlling the air flow in the ventilation system of the coal mine shaft. Usually, a pedestrian door for employees to pass through is provided on the automatic air door, and there may be a situation where the pedestrian door leaks air, which may cause the air flow to be short-circuited, increasing the operation risk of employees in the coal mine shaft. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide a control circuit for an automatic air door in a coal mine shaft, an automatic air door control box, and a ventilation system to solve the technical problems existing in the above related technologies.

[0004] To achieve the above purpose, in a first aspect, the present disclosure provides a control circuit for an automatic air door in a coal mine shaft, including a signal detection unit, a power supply, and a switch control unit. The output end of the signal detection unit is connected to the input end of the switch control unit, the input end and the output end of the signal detection unit are both connected to the power supply, the input end and the output end of the switch control unit are both connected to the power supply. The signal detection unit is arranged in the area of the automatic air door close to the first pedestrian door, and the switch control unit is arranged in the area of the automatic air door close to the second pedestrian door;

[0005] The signal detection unit is configured to detect a first signal indicating that the first pedestrian door is in an open state, and input the first signal into the switch control unit;

[0006] The switch control unit is configured to control the second pedestrian door to be in a closed state when receiving the first signal.

[0007] Optionally, the switch control unit includes a relay module and an electromagnet. The first port of the relay module is connected to the signal detection unit, the second port of the relay module is connected to the power supply through the electromagnet, and the third port of the relay module is connected to the power supply;

[0008] The relay module is configured to control the electromagnet to conduct electricity after receiving the first signal, so that the second pedestrian door is in a closed state.

[0009] Optionally, the relay module includes a relay coil and a normally closed switch. One end of the relay coil is connected to the signal detection unit, the other end of the relay coil is connected to the power supply, one end of the normally closed switch is connected to the electromagnet, and the other end of the normally closed switch is connected to the power supply;

[0010] The relay coil is used to control the normally closed switch to be in a closed state when receiving the first signal, so as to conduct the electromagnet.

[0011] Optionally, the electromagnet includes a first electromagnet and a second electromagnet. The first electromagnet is disposed at any position on the first frame, the second frame, and the third frame of the second doorframe of the automatic air door, and the second electromagnet is disposed at the position of the second pedestrian door corresponding to the first electromagnet, wherein the first frame, the second frame, and the third frame are frames not connected to the second pedestrian door.

[0012] Optionally, the number of the electromagnets is at least one.

[0013] Optionally, the signal detection unit includes a proximity switch. The VCC port of the proximity switch is connected to the positive pole of the power supply, the GND port of the proximity switch is connected to the negative pole of the power supply, and the OUT port of the proximity switch is connected to the input end of the switch control module.

[0014] Optionally, the proximity switch is disposed at any position on the fourth frame, the fifth frame, and the sixth frame of the first doorframe of the automatic air door, and the fourth frame, the fifth frame, and the sixth frame are frames not connected to the first pedestrian door.

[0015] Optionally, the proximity switch is an NPN type proximity switch or a three-wire proximity switch.

[0016] Optionally, the number of the proximity switches is at least one.

[0017] In a second aspect, the present disclosure further provides an automatic air door control box, including the control circuit according to any one of the first aspects of the present disclosure.

[0018] In a third aspect, the present disclosure further provides a ventilation system, including the automatic air door control box according to the first aspect of the present disclosure.

[0019] Through the above technical solutions, a signal detection unit is disposed in the area near the first pedestrian door, a switch control unit is disposed in the area near the second pedestrian door, and the signal detection unit detects a first signal indicating that the first pedestrian door is in an open state and inputs the first signal into the switch control unit. After receiving the first signal, the switch control unit controls the second pedestrian door to be in a closed state, so that when the first pedestrian door is in an open state, the second pedestrian door is in a closed state, which can prevent the situation that the first pedestrian door and the second pedestrian door are opened simultaneously, thereby reducing the occurrence of the short-circuit of the air flow and reducing the risk of employees in the coal mine underground.

[0020] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. Brief Description of the Drawings

[0021] The accompanying drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0022] Figure 1 is a schematic diagram showing a control circuit of an automatic air door in a coal mine shaft according to an exemplary embodiment of the present disclosure.

[0023] Figure 2 is a schematic diagram showing an automatic air door according to an exemplary embodiment of the present disclosure.

[0024] Figure 3 is a schematic diagram showing a control circuit according to an exemplary embodiment of the present disclosure.

[0025] Figure 4 is a schematic circuit diagram showing that an automatic air door includes two pedestrian doors according to an exemplary embodiment of the present disclosure.

[0026] Figure 5 is a block diagram showing a controller according to an exemplary embodiment.

[0027] Figure 6 is a block diagram showing a ventilation system according to an exemplary embodiment.

[0028] Description of the Reference Numerals

[0029] 1. Power supply; 2. Signal detection unit; 3. Switch control unit; 4. Automatic air door; 5. Second pedestrian door; 6. First pedestrian door; 7. First position; 8. Second position; 9. Relay coil; 10. Proximity switch; 11. Normally closed switch; 12. Electromagnet; 500. Controller; 501. Control circuit of the automatic air door; 600. Ventilation system. Detailed Description

[0030] The following is a detailed description of the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present disclosure, and are not used to limit the present disclosure.

[0031] In the automatic air doors in coal mine shafts, usually two pedestrian doors are provided, and these two pedestrian doors can be important channels for ensuring ventilation of the working environment in coal mine shafts.

[0032] However, the inventor found that when the two pedestrian doors in the automatic air door are opened simultaneously, it may cause the short - circuit of the air flow, thereby increasing the risk to the operating personnel in the coal mine shaft.

[0033] In view of this, the present disclosure provides a control circuit for an automatic air door in a coal mine shaft, an automatic air door control box, and a ventilation system to solve the technical problems existing in the related art.

[0034] As Figure 1 shown, Figure 1 FIG. is a schematic diagram of a control circuit for an automatic air door 4 in a coal mine shaft according to an exemplary embodiment of the present disclosure. Referring to Figure 1 , it includes a signal detection unit 2, a power supply 1, and a switch control unit 3. The output end of the signal detection unit 2 is connected to the input end of the switch control unit 3. The input end and the output end of the signal detection unit 2 are both connected to the power supply 1. The input end and the output end of the switch control unit 3 are both connected to the power supply 1. The signal detection unit 2 is arranged in the area of the automatic air door 4 close to the first pedestrian door 6, and the switch control unit 3 is arranged in the area of the automatic air door 4 close to the second pedestrian door 5;

[0035] The signal detection unit 2 is configured to detect a first signal indicating that the first pedestrian door 6 is in an open state and input the first signal into the switch control unit 3;

[0036] The switch control unit 3 is configured to control the second pedestrian door 5 to be in a closed state when receiving the first signal.

[0037] Through the above technical solution, the signal detection unit 2 is arranged in the area close to the first pedestrian door 6, the switch control unit 3 is arranged in the area close to the second pedestrian door 5, and the signal detection unit 2 detects the first signal indicating that the first pedestrian door 6 is in an open state and inputs the first signal into the switch control unit 3. After receiving the first signal, the switch control unit 3 controls the second pedestrian door 5 to be in a closed state, so that when the first pedestrian door 6 is in an open state, the second pedestrian door 5 is in a closed state, which can prevent the situation that the first pedestrian door 6 and the second pedestrian door 5 are opened simultaneously, thereby reducing the occurrence of the short-circuit of the air flow and reducing the risk of employees in the coal mine shaft at the same time.

[0038] To enable those skilled in the art to better understand the control circuit of the automatic air door 4 in the coal mine shaft provided by the present disclosure, the above steps will be described in detail with examples below.

[0039] Exemplarily, the power supply 1 can be the power supply 1 provided on the fan control box. This power supply 1 can be used to supply power to the signal detection unit 2 and the switch control unit 3. The signal detection unit 2 can be set in the area of the automatic air door 4 near the first pedestrian door 6, for example, it can be set on the door frame where the first pedestrian door 6 is installed. The switch control unit 3 can be set in the area near the second pedestrian door 5, for example, it can be set on the second door frame where the second pedestrian door 5 is installed. The first pedestrian door 6 and the second pedestrian door 5 are pedestrian doors at different positions on the automatic air door 4, as Figure 2 shown Figure 2 in, the first position 7 in Figure 2 can be set with the first pedestrian door 6, Figure 2 the second position 8 in can be set with the second pedestrian door 5. In this regard, the embodiments of the present disclosure do not make specific limitations.

[0040] In the signal detection unit 2, the state signal of the first pedestrian door 6 can be detected in real time. For example, when the first pedestrian door 6 is in the open state, the signal detection unit 2 can detect a first signal used to represent that the first pedestrian door 6 is in the open state, and then this first signal can be input into the switch control unit. Among them, this first signal can be a voltage signal or a current signal.

[0041] When the switch control unit 3 receives the first signal, it can represent that the first pedestrian door 6 is opened at this time. To avoid the situation where the second pedestrian door 5 and the first pedestrian door 6 are opened simultaneously, at this time, it is necessary to control the second pedestrian door 5 to be in the closed state. In this embodiment, the second pedestrian door 5 can be controlled to be in the closed state through the switch control unit.

[0042] By setting the signal detection unit 2 and the switch control unit 3 in different areas, when the first pedestrian door 6 is in the open state, the second pedestrian door 5 can be in the closed state, thereby preventing the situation where the first pedestrian door 6 and the second pedestrian door 5 are opened simultaneously, further reducing the occurrence of the short-circuit of the air flow, and at the same time reducing the risk of employees in the coal mine.

[0043] In a possible way, the switch control unit 3 includes a relay module and an electromagnet 12. The first port of the relay module is connected to the signal detection unit 2, the second port of the relay module is connected to the power supply 1 through the electromagnet 12, and the third port of the relay module is connected to the power supply 1;

[0044] The relay module is used to control the electromagnet 12 to conduct electricity after receiving the first signal, so that the second pedestrian door 5 is in the closed state.

[0045] It should be understood that when the second pedestrian door 5 is controlled to be in the closed state by the switch control unit 3, it can be controlled by the cooperation of the relay module and the electromagnet 12.

[0046] The electromagnet 12 can be a device that uses an electric current to generate a magnetic field to attract magnetic objects. The relay module can be connected to the signal detection unit 2. When the signal detection unit 2 sends the first signal to the relay module, the relay module can make the electromagnet 12 conduct electricity under the action of the first signal. Furthermore, when the electromagnet 12 is conducting electricity, it can control the second pedestrian door 5 to be in the closed state.

[0047] By controlling the electromagnet 12 to conduct electricity when the first pedestrian door 6 is in the open state through the relay module, and then controlling the second pedestrian door 5 to be in the closed state through the electromagnet 12, it can ensure that when the first pedestrian door 6 is in the open state, the second pedestrian door 5 is in the closed state. Furthermore, it can reduce the risk of the air flow being short-circuited and improve the safety of the underground coal mine workers at the same time.

[0048] In a possible way, the relay module includes a relay coil 9 and a normally closed switch 11. One end of the relay coil 9 is connected to the signal detection unit 2, the other end of the relay coil 9 is connected to the power supply 1, one end of the normally closed switch 11 is connected to the electromagnet 12, and the other end of the normally closed switch 11 is connected to the power supply 1;

[0049] The relay coil 9 is used to control the normally closed switch 11 to be in the closed state when receiving the first signal, so as to conduct the electromagnet 12.

[0050] It should be understood that in the relay module, the cooperation mode of the relay coil 9 and the normally closed switch 11 can be set to control whether the electromagnet 12 conducts electricity. The relay coil 9 can be connected to the signal detection unit 2. When the signal detection unit 2 inputs the first signal into the relay coil 9, the relay coil 9 loses power, and then the normally closed contact closes, making the electromagnet 12 conduct electricity. The conducting electromagnet 12 can make the second pedestrian door 5 be in the closed state.

[0051] In a possible way, the electromagnet 12 includes a first electromagnet 12 and a second electromagnet 12. The first electromagnet 12 is arranged at any position on the first frame, the second frame and the third frame in the second doorframe of the automatic air door 4, and the second electromagnet 12 is arranged at the position of the second pedestrian door 5 corresponding to the first electromagnet 12, where the first frame, the second frame and the third frame are frames not connected to the second pedestrian door 5.

[0052] It should be understood that the electromagnet 12 may include a first electromagnet 12 and a second electromagnet 12. When the first electromagnet 12 is provided on the second pedestrian door 5, the second electromagnet 12 may be provided at the position of the automatic air door 4 corresponding to the first electromagnet 12. When the second electromagnet 12 is provided on the second pedestrian door 5, the first electromagnet 12 may be provided at the position of the automatic air door 4 corresponding to the second electromagnet 12. When the electromagnet 12 is energized, the first electromagnet 12 and the second electromagnet 12 can attract each other, and thus the second pedestrian door 5 can be closed. Among them, the number of electromagnets 12 provided in the switch control unit 3 is at least one. And the more the number of electromagnets 12 is set, the firmer the second pedestrian door 5 is closed.

[0053] In a possible manner, the signal detection unit 2 includes a proximity switch 10. The VCC port of the proximity switch 10 is connected to the positive pole of the power supply 1, the GND port of the proximity switch 10 is connected to the negative pole of the power supply 1, and the OUT port of the proximity switch 10 is connected to the input end of the switch control module.

[0054] It should be understood that the specific circuit diagram of the signal detection unit 2 is as Figure 3 shown. The proximity switch 10 can be used to detect whether an object is approaching without contacting the object. The proximity switch 10 provided in this embodiment may include a transistor, a laser diode, and a circuit control unit. When an object approaches the proximity switch 10, the object will block the light emitted by the laser diode, and the blocked light cannot reach the transistor, thereby causing the collector current of the transistor to decrease, and a negative power supply 1 can be output from the OUT port of the proximity switch 10. Among them, the number of proximity switches 10 is at least set to one.

[0055] In a possible manner, the proximity switch 10 is provided at any position on the fourth frame, the fifth frame, and the sixth frame of the first doorframe of the automatic air door 4. The fourth frame, the fifth frame, and the sixth frame are frames that are not connected to the first pedestrian door 6.

[0056] It should be understood that the proximity switch 10 can be provided at any position on the fourth frame, the fifth frame, and the sixth frame of the first doorframe. When the first pedestrian door 6 is closed, the proximity switch 10 can detect a signal of an approaching object and thus output a high-level signal.

[0057] When the first pedestrian door 6 is opened, the proximity switch 10 can detect the first signal, and then transmit the first signal to the switch control unit 3. When the switch control unit 3 receives the first signal, it can represent that the first pedestrian door 6 is opened at this time, and then it is necessary to control the second pedestrian door 5 to be in a locked state. Thus, the second pedestrian door 5 can be locked by the electromagnet provided in the switch control unit 3, and then it can be ensured that when the first pedestrian door 6 is in the open state, the second pedestrian door 5 is in the locked state. Among them, the proximity switch 10 can be an NPN type proximity switch or a three-wire proximity switch. In this regard, the embodiments of the present disclosure do not make specific limitations.

[0058] Referring to Figure 2 , Figure 2 Yes, as Figure 2 shown, when the automatic air door 4 includes two pedestrian doors, control circuits of the coal mine shaft automatic air door 4 are respectively arranged corresponding to each pedestrian door, so as to control that the two pedestrian doors cannot be opened simultaneously. Specifically, the first pedestrian door 6 of the automatic air door 4 can be the A door, and the second pedestrian door 5 of the automatic air door 4 can be the B door. A signal detection unit 2 corresponding to the A door can be arranged on the A door, and then the switch control unit 3 corresponding to the A door can be arranged on the B door. A model detection unit corresponding to the B door can be arranged on the B door, and then the switch control unit corresponding to the B door can be arranged on the A door. Thus, when the A door is in the open state, the B door can be controlled to be in the closed state by the switch control unit 3 corresponding to the A door, and when the B door is in the open state, the A door can be controlled to be in the closed state by the switch control unit 3 corresponding to the B door. Furthermore, it can prevent the situation that the first pedestrian door 6 and the second pedestrian door 5 are both in the open state, and can reduce the situation that the air flow of the automatic air door 4 is short-circuited, and then improve the safety of relevant operating personnel in the coal mine.

[0059] When specifically connecting the circuit, as Figure 4 shown, in this circuit, X1+ can represent the positive pole of the proximity switch 10 connected to the A door of the automatic air door 4, X1- can represent the negative pole of the proximity switch 10 connected to the A door of the automatic air door 4, and the OUT port of the proximity switch 10 connected to the A door can represent the signal terminal of the proximity switch 10 connected to the A door of the automatic air door 4. X2+ can represent the positive pole of the electromagnet 12 of the A door of the automatic air door 4, and X2- can represent the negative pole of the electromagnet 12 of the A door of the automatic air door 4.

[0060] X3+ can represent the positive pole of proximity switch 10 connected to Door B of automatic air door 4, X3- can represent the negative pole of proximity switch 10 connected to Door B of automatic air door 4, the OUT port of proximity switch 10 connected to Door B can represent the signal terminal of proximity switch 10 connected to Door B of automatic air door 4, X4+ can represent the positive pole of electromagnet 12 of Door B of automatic air door 4, and X4- can represent the negative pole of electromagnet 12 of Door B of automatic air door 4. KA1 can represent the coil 9 of A-door control relay and its normally closed contact, and KA2 can represent the coil 9 of B-door control relay and its normally closed contact. The principle of specific automatic locking is elaborated in the following paragraphs.

[0061] When the two pedestrian doors on automatic air door 4 are closed: Proximity switch 10X1 connected to Door A and proximity switch 10X3 connected to Door B receive the blocked signal, and the OUT ports of the two proximity switches 10 output 24V negative power supply 1. The coils 9 of KA1 and KA2 relays are energized and attracted, and the normally closed contacts of KA1 and KA2 are disconnected, and 24V power supply 1 is not output to electromagnet 12X2 connected to Door A and electromagnet 12X4 connected to Door B. Electromagnet 12X2 connected to Door A and electromagnet 12X4 connected to Door B are not energized. At this time, both Door A and Door B can be opened.

[0062] When Door A on automatic air door 4 is opened, the detection signal of proximity switch 10 connected to Door A is disconnected, and the OUT port of proximity switch 10 connected to Door A disconnects the output of 24V- power supply 1 at this time. The coil 9 of KA1 relay loses power and disconnects, and at the same time, the normally closed contact of KA1 is restored. At this time, the corresponding electromagnet 12X4 of Door B is energized so that Door B cannot be opened, and the locking function of the pedestrian door on automatic air door 4 can be realized. When Door B of automatic air door 4 is opened, similarly to the above, electromagnet 12X2 of Door A of automatic air door 4 is energized so that Door A cannot be opened.

[0063] Through the above technical solution, the switch control unit 3 is set to be controlled by electromagnet 12. The signal detection unit 2 is set in the area close to the first pedestrian door 6, and the switch control unit 3 is set in the area close to the second pedestrian door 5. The signal detection unit 2 detects the first signal indicating that the first pedestrian door 6 is in the open state and inputs the first signal into the switch control unit 3. After receiving the first signal, the switch control unit 3 controls the second pedestrian door 5 to be in the closed state, so that when the first pedestrian door 6 is in the open state, the second pedestrian door 5 is in the closed state, which can prevent the situation where the first pedestrian door 6 and the second pedestrian door 5 are opened simultaneously, and thus can reduce the occurrence of the short-circuit of the air flow, and at the same time can reduce the risk of employees in the coal mine.

[0064] Based on the same concept, this embodiment also discloses an automatic air door control box, including the control circuit of the automatic air door in the coal mine provided in this embodiment.

[0065] Figure 5 is a block diagram showing a controller 500 according to an exemplary embodiment. As Figure 5 shown, a control circuit 501 for an automatic air damper is provided on the controller 500.

[0066] Based on the same concept, this embodiment also discloses a ventilation system, including the automatic air damper control box disclosed in this embodiment.

[0067] Figure 6 is a block diagram showing a ventilation system 600 according to an exemplary embodiment. As Figure 6 shown, the controller 500 provided in this embodiment is provided on the ventilation system 600.

[0068] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0069] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, without conflict, they can be combined in any suitable manner. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0070] Furthermore, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A control circuit for an automatic air door in a coal mine shaft, characterized in that, It includes a signal detection unit (2), a power supply (1), and a switch control unit (3). The output end of the signal detection unit (2) is connected to the input end of the switch control unit (3). The input end and the output end of the signal detection unit (2) are both connected to the power supply (1). The input end and the output end of the switch control unit (3) are both connected to the power supply (1). The signal detection unit (2) is arranged in the area of the automatic air door (4) close to the first pedestrian door (6), and the switch control unit (3) is arranged in the area of the automatic air door (4) close to the second pedestrian door (5). The signal detection unit (2) is used to detect a first signal indicating that the first pedestrian door (6) is in an open state, and input the first signal into the switch control unit (3). The switch control unit (3) is used to control the second pedestrian door (5) to be in a closed state when receiving the first signal.

2. The control circuit of the automatic air door in a coal mine shaft according to claim 1, characterized in that, The switch control unit (3) includes a relay module and an electromagnet (12). The first port of the relay module is connected to the signal detection unit (2). The second port of the relay module is connected to the power supply (1) through the electromagnet (12). The third port of the relay module is connected to the power supply (1). The relay module is used to control the electromagnet (12) to conduct electricity after receiving the first signal, so that the second pedestrian door (5) is in a closed state.

3. The control circuit of the automatic air door in a coal mine shaft according to claim 2, characterized in that, The relay module includes a relay coil (9) and a normally closed switch (11). One end of the relay coil (9) is connected to the signal detection unit (2), and the other end of the relay coil (9) is connected to the power supply (1). One end of the normally closed switch (11) is connected to the electromagnet (12), and the other end of the normally closed switch (11) is connected to the power supply (1). The relay coil (9) is used to control the normally closed switch (11) to be in a closed state when receiving the first signal, so as to conduct the electromagnet (12).

4. The control circuit of the automatic air door in the coal mine shaft according to claim 2 or 3, characterized in that, The electromagnet (12) includes a first electromagnet (12) and a second electromagnet (12). The first electromagnet (12) is arranged at any position on the first frame, the second frame, and the third frame in the second door frame of the automatic air door (4), and the second electromagnet (12) is arranged at the position of the second pedestrian door (5) corresponding to the first electromagnet (12). Among them, the first frame, the second frame, and the third frame are frames not connected to the second pedestrian door (5).

5. The control circuit of the automatic air door in the coal mine shaft according to claim 2 or 3, characterized in that The number of the electromagnets (12) is at least one.

6. The control circuit of the automatic air door in the coal mine shaft according to claim 1, characterized in that, The signal detection unit (2) includes a proximity switch (10). The VCC port of the proximity switch (10) is connected to the positive pole of the power supply (1), the GND port of the proximity switch (10) is connected to the negative pole of the power supply (1), and the OUT port of the proximity switch (10) is connected to the input end of the switch control unit.

7. The control circuit of the automatic air door in a coal mine shaft according to claim 6, wherein, The proximity switch (10) is disposed at any position on the fourth frame, the fifth frame, and the sixth frame of the first doorframe of the automatic air door (4), and the fourth frame, the fifth frame, and the sixth frame are frames not connected to the first pedestrian door (6).

8. The control circuit of the automatic air door in a coal mine shaft according to claim 6, characterized in that, The proximity switch (10) is an NPN type proximity switch or a three-wire proximity switch.

9. The control circuit of the automatic air door in the coal mine shaft according to claim 8, characterized in that, The number of the proximity switches (10) is at least one.

10. An automatic air door control box, characterized in that, It includes the control circuit according to any one of claims 1-9.

11. A ventilation system, characterized in that, It includes the automatic air door control box according to claim 10.

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