Security sensor alarm device and method thereof

Abstract

The present invention discloses a security sensor alarm device and a method thereof, and relates to the technical field of alarm devices. The security sensor alarm device comprises a door frame, a password anti-theft door, a password lock and an alarm, the side wall of the password anti-theft door is provided with an alarm mechanism, and the alarm mechanism comprises an installation box fixedly connected to the side wall of the password anti-theft door, the alarm is arranged in the installation box, and the inner side wall of the installation box is rotatably connected to a first rotating plate through a first rotating mechanism, the top of the first rotating plate is fixedly connected to a sensing block, and the inner side wall of the installation box is connected to a moving plate through a reset mechanism, the bottom of the moving plate is fixedly connected to a distance sensor, and the rotation of the first rotating plate is driven by a pushing mechanism. The security sensor alarm device and the method thereof can timely alarm when the password anti-theft door is violently opened, and can timely alarm when a fire occurs, which is safer and more reliable, so that the security effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of alarm devices, and in particular to a security sensor alarm device and a method thereof. Background Art

[0002] Password security doors can be widely used in a variety of places, mainly including homes, offices, warehouses and other environments that require security protection. Password security doors can serve as the first line of defense for home security, achieving access control through passwords, fingerprints or facial recognition, effectively preventing strangers from breaking in and protecting the personal and property safety of family members.

[0003] However, when the existing password anti-theft door is used, when the anti-theft door is opened violently, it is not convenient to timely alarm through the sensor, it is not easy to be discovered in time, it is not safe and reliable enough, and it is not convenient to timely alarm when a fire occurs, thereby affecting the security effect. Summary of the invention

[0004] The object of the present invention is to provide a security sensor alarm device and method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a security sensor alarm device, comprising a door frame, a password anti-theft door, a password lock and an alarm, the side wall of the password anti-theft door is provided with an alarm mechanism, and the alarm mechanism comprises an installation box fixedly connected to the side wall of the password anti-theft door, the alarm is arranged in the installation box, and the inner side wall of the installation box is rotatably connected to a first rotating plate through a first rotating mechanism, the top of the first rotating plate is fixedly connected to a sensing block, and the inner side wall of the installation box is connected to a movable plate through a reset mechanism, the bottom of the movable plate is fixedly connected to a distance sensor, and the rotation of the first rotating plate is driven by a driving mechanism.

[0006] Preferably, the first rotating mechanism comprises two symmetrically arranged fixing blocks fixedly connected to the inner side wall of the installation box, and the first rotating plate is rotatably connected to the side wall of the fixing block via a first rotating shaft.

[0007] Preferably, the pushing mechanism is provided with a strip-shaped opening at the top of the installation box, and a second rotating plate is inserted in the strip-shaped opening, a U-shaped plate is inserted at the top of the installation box, the U-shaped plate is connected to the bottom of the installation box through a telescopic mechanism, and the side wall of the U-shaped plate is rotatably connected to the second rotating plate through a second rotating mechanism, the lower end of the second rotating plate is fixedly connected to a connecting block, and the side wall of the connecting block is fixedly connected to a V-shaped block, the top of the first rotating plate is fixedly connected to a mounting block, and the side wall of the mounting block is fixedly connected to a pushing pin, the pushing pin can slide on the side wall of the V-shaped block, and the side wall of the U-shaped plate is provided with an alarm component for alarming a fire.

[0008] Preferably, the telescopic mechanism includes two symmetrically arranged sleeves fixedly connected to the bottom of the installation box, and each sleeve is inserted with a sleeve rod, the upper end of the sleeve rod is fixed to the bottom of the U-shaped plate, and the side wall of each sleeve is sleeved with a first spring.

[0009] Preferably, the second rotating mechanism comprises a roller inserted in the U-shaped plate, the roller is rotatably connected to the side wall of the U-shaped plate via a second rotating shaft, and the second rotating plate is fixed to one end of the second rotating shaft.

[0010] Preferably, the alarm assembly comprises a U-shaped frame, a side wall of the U-shaped frame is fixedly provided with an infrared sensor, and the U-shaped frame is connected to the side wall of the U-shaped plate via a third rotating mechanism.

[0011] Preferably, the third rotating mechanism includes two symmetrically arranged support blocks fixedly connected to the side walls of the U-shaped plate, and the U-shaped frame is rotatably connected to the side walls of the support blocks through a third rotating shaft, the side walls of the support blocks are fixedly connected to a motor, and the output end of the motor is fixed to one end of the third rotating shaft.

[0012] Preferably, the reset mechanism includes a first connecting plate fixedly connected to the inner wall of the installation box, and the side wall of the first connecting plate is fixedly connected to two symmetrically arranged T-shaped guide rods, the side wall of the T-shaped guide rod is sleeved with a second connecting plate, and the second connecting plate is fixed to the top of the movable plate, the side wall of each T-shaped guide rod is sleeved with a second spring, and a movable mechanism is arranged between the first connecting plate and the second connecting plate.

[0013] Preferably, the moving mechanism includes an electromagnet fixedly connected to the side wall of the first connecting plate, and an iron block is fixedly connected to the side wall of the second connecting plate.

[0014] A security sensor alarm method, using the security sensor alarm device described above, comprises the following steps:

[0015] S1: When the password anti-theft door is opened normally, the password needs to be entered through the password lock. At the same time, the electromagnet is energized to attract the iron block, so that the second connecting plate and the moving plate move in the direction close to the first connecting plate, and drive the distance sensor to move synchronously. At the same time, the second spring is compressed. At this time, the distance sensor is staggered, so that when the password anti-theft door is opened normally, no alarm is given, and when the password anti-theft door is closed normally, no alarm is given, avoiding false alarms, which is more accurate and reliable;

[0016] S2: After the password anti-theft door is closed, the roller abuts against the top of the door frame, thereby pushing the U-shaped plate to move downward, and at the same time, the first spring is compressed. At the same time, the second rotating plate drives the connecting block and the V-shaped block to move downward. At this time, the first rotating plate can rotate downward along the first rotating axis under the action of gravity, and at the same time, the push pin slides upward along the side wall of the V-shaped block;

[0017] S3: When the password anti-theft door is opened violently, the roller rolls along the top of the door frame, thereby driving the second rotating plate to rotate through the second rotating shaft, and then driving the connecting block and the V-shaped block to rotate, so that the push pin slides upward along the side wall of the V-shaped block, thereby driving the first rotating plate to rotate upward along the first rotating shaft, and driving the sensing block to move synchronously. At this time, the distance sensor detects the sensing block and alarms, so that the password anti-theft door can be opened violently. The alarm is more safe and reliable;

[0018] S4: When the password anti-theft door is forgotten to be closed, the U-shaped plate and the roller can move upward under the action of the first spring, and the second rotating plate drives the connecting block and the V-shaped block to move upward synchronously, so that the push pin slides upward along the side wall of the V-shaped block, and the first rotating plate can be pushed to rotate upward along the first rotating axis. At this time, the distance sensor can also detect the sensing block and alarm, which is safer and more reliable;

[0019] S5: Moreover, when in use, the fire is detected by the infrared sensor and an alarm is given in time. At the same time, the motor is started, and the rotation of the motor drives the rotation of the third shaft, and then drives the U-shaped frame and the infrared sensor to rotate, so that the detection effect is better and more comprehensive, and thus safer and more reliable.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) This security sensor alarm device and method, by setting an alarm mechanism, etc., after the password anti-theft door is closed, the roller abuts against the top of the door frame, thereby pushing the U-shaped plate to move downward, and at the same time, the first spring is compressed. At the same time, the second rotating plate drives the connecting block and the V-shaped block to move downward. At this time, the first rotating plate can rotate downward along the first rotating axis under the action of gravity, and at the same time, the push pin slides upward along the side wall of the V-shaped block. When the password anti-theft door is violently opened, the roller rolls along the top of the door frame, thereby driving the second rotating plate to rotate through the second rotating axis, and then driving the connecting block and the V-shaped block to rotate, so that the push pin moves along the side wall of the V-shaped block. The wall slides upward, thereby driving the first rotating plate to rotate upward along the first rotating axis, and driving the sensing block to move synchronously. At this time, the distance sensor detects the sensing block and alarms, so that it can alarm when the password anti-theft door is violently opened, which is safer and more reliable. In addition, when the password anti-theft door is forgotten to be closed, at this time, the U-shaped plate and the roller can move upward under the action of the first spring, and the connecting block and the V-shaped block are driven to move upward synchronously through the second rotating plate, so that the pushing pin slides upward along the side wall of the V-shaped block, which can push the first rotating plate to rotate upward along the first rotating axis. At this time, the sensing block can also be detected and an alarm can be issued through the distance sensor, which is safer and more reliable.

[0022] (2) This security sensor alarm device and method, by setting a reset mechanism, etc., when the password anti-theft door is normally opened, it is necessary to enter the password through the password lock. At the same time, the electromagnet is energized to attract the iron block, so that the second connecting plate and the movable plate move in the direction close to the first connecting plate, and drive the distance sensor to move synchronously. At the same time, the second spring is compressed. At this time, the distance sensor is staggered, so that when the password anti-theft door is normally opened, no alarm is given, and when the password anti-theft door is normally closed, no alarm is given, avoiding false alarms, and being more accurate and reliable.

[0023] (3) This security sensor alarm device and method, by setting up an alarm component, etc., when in use, detects fire through an infrared sensor and issues an alarm in a timely manner. At the same time, the motor is started, and the rotation of the motor drives the rotation of the third shaft, which in turn drives the U-shaped frame and the infrared sensor to rotate, making the detection effect better and more comprehensive, and thus safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the use state of the present invention;

[0025] Figure 2 It is a schematic diagram of the position of the alarm mechanism in the present invention;

[0026] Figure 3 It is a partial cross-sectional structural schematic diagram of the installation box in the present invention;

[0027] Figure 4 It is a schematic diagram of the positions of the reset mechanism and the moving mechanism in the present invention;

[0028] Figure 5 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0029] Figure 6 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0030] Figure 7 for Figure 4 Schematic diagram of the enlarged structure at point C in the middle.

[0031] In the figure: 1, door frame; 2, first rotating mechanism; 201, fixed block; 202, first rotating shaft; 3, pushing mechanism; 301, strip opening; 302, second rotating plate; 303, connecting block; 304, V-shaped block; 305, mounting block; 306, pushing pin; 4, telescopic mechanism; 401, sleeve rod; 402, sleeve; 403, first spring; 5, second rotating mechanism; 501, U-shaped plate; 502, second rotating shaft; 503, roller; 6, alarm component; 601, U-shaped frame; 602, infrared sensor; 7. third rotating mechanism; 701. support block; 702. third rotating shaft; 703. motor; 8. reset mechanism; 801. first connecting plate; 802. T-shaped guide rod; 803. second connecting plate; 804. second spring; 9. moving mechanism; 901. electromagnet; 902. iron block; 10. password anti-theft door; 11. password lock; 12. alarm mechanism; 1201. installation box; 1202. first rotating plate; 1203. induction block; 1204. moving plate; 1205. distance sensor. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 7The present invention provides a technical solution: a security sensor alarm device, comprising a door frame 1, a password anti-theft door 10, a password lock 11 and an alarm, the side wall of the password anti-theft door 10 is provided with an alarm mechanism 12, and the alarm mechanism 12 comprises an installation box 1201 fixedly connected to the side wall of the password anti-theft door 10, the alarm is arranged in the installation box 1201, and the inner side wall of the installation box 1201 is rotatably connected with a first rotating plate 1202 through a first rotating mechanism 2, the top of the first rotating plate 1202 is fixedly connected with a sensing block 1203, and the inner side wall of the installation box 1201 is connected with a moving plate 1204 through a reset mechanism 8, the bottom of the moving plate 1204 is fixedly connected with a distance sensor 1205, and the rotation of the first rotating plate 1202 is driven by a pushing mechanism 3, when the password anti-theft door 10 is violently opened, an alarm is promptly issued, and when a fire occurs, an alarm is promptly issued, which is safer and more reliable, so that the security effect is better.

[0034] The first rotating mechanism 2 includes two symmetrically arranged fixing blocks 201 fixedly connected to the inner side wall of the installation box 1201, and the first rotating plate 1202 is rotatably connected to the side wall of the fixing block 201 through the first rotating shaft 202 to ensure the normal rotation of the first rotating plate 1202.

[0035] The pushing mechanism 3 is provided with a strip opening 301 at the top of the installation box 1201, and a second rotating plate 302 is inserted in the strip opening 301, a U-shaped plate 501 is inserted at the top of the installation box 1201, the U-shaped plate 501 is connected to the bottom of the installation box 1201 through the telescopic mechanism 4, and the side wall of the U-shaped plate 501 is rotatably connected to the second rotating plate 302 through the second rotating mechanism 5, the lower end of the second rotating plate 302 is fixedly connected to a connecting block 303, and the side wall of the connecting block 303 is fixedly connected to a V-shaped block 304, the top of the first rotating plate 1202 is fixedly connected to a mounting block 305, and the side wall of the mounting block 305 is fixedly connected to a pushing pin 306, the pushing pin 306 can slide on the side wall of the V-shaped block 304, and the side wall of the U-shaped plate 501 is provided with an alarm component 6 for alarming a fire, after the password anti-theft door 10 is closed, The roller 503 abuts against the top of the door frame 1, thereby pushing the U-shaped plate 501 to move downward. At the same time, the connecting block 303 and the V-shaped block 304 are driven downward by the second rotating plate 302. At this time, the first rotating plate 1202 can rotate downward along the first rotating shaft 202 under the action of gravity. At the same time, the pushing pin 306 slides upward along the side wall of the V-shaped block 304. When the password anti-theft door 10 is violently opened, the second rotating plate 302 is driven to rotate by the second rotating mechanism 5, and then the connecting block 303 and the V-shaped block 304 are driven to rotate, so that the pushing pin 306 slides upward along the side wall of the V-shaped block 304, thereby driving the first rotating plate 1202 to rotate upward along the first rotating shaft 202, and driving the sensing block 1203 to move synchronously. At this time, the distance sensor 1205 detects the sensing block 1203 and alarms.

[0036] The telescopic mechanism 4 includes two symmetrically arranged sleeves 402 fixedly connected to the bottom of the installation box 1201, and each sleeve 402 is inserted with a sleeve rod 401, the upper end of the sleeve rod 401 is fixed to the bottom of the U-shaped plate 501, and the side wall of each sleeve 402 is sleeved with a first spring 403, which guides and resets the movement of the U-shaped plate 501.

[0037] The second rotating mechanism 5 includes a roller 503 inserted in the U-shaped plate 501, the roller 503 is rotatably connected to the side wall of the U-shaped plate 501 through the second rotating shaft 502, and the second rotating plate 302 is fixed to one end of the second rotating shaft 502. When the password anti-theft door 10 is violently opened, the roller 503 rolls along the top of the door frame 1, thereby driving the second rotating plate 302 to rotate through the second rotating shaft 502.

[0038] The alarm component 6 includes a U-shaped frame 601, and an infrared sensor 602 is fixedly inserted into the side wall of the U-shaped frame 601, and the U-shaped frame 601 is connected to the side wall of the U-shaped plate 501 through a third rotating mechanism 7. When in use, the infrared sensor 602 detects fire and issues an alarm in time.

[0039] The third rotating mechanism 7 includes two symmetrically arranged support blocks 701 fixedly connected to the side walls of the U-shaped plate 501, and the U-shaped frame 601 is rotatably connected to the side walls of the support blocks 701 through a third rotating shaft 702. The side walls of the support blocks 701 are fixedly connected with a motor 703, and the output end of the motor 703 is fixed to one end of the third rotating shaft 702. When the motor 703 is started, the rotation of the motor 703 drives the rotation of the third rotating shaft 702, and then drives the U-shaped frame 601 and the infrared sensor 602 to rotate, so that the detection effect is better, more comprehensive, and thus safer and more reliable.

[0040] The reset mechanism 8 includes a first connecting plate 801 fixedly connected to the inner wall of the installation box 1201, and the side wall of the first connecting plate 801 is fixedly connected to two symmetrically arranged T-shaped guide rods 802, the side wall of the T-shaped guide rod 802 is sleeved with a second connecting plate 803, and the second connecting plate 803 is fixed to the top of the movable plate 1204, the side wall of each T-shaped guide rod 802 is sleeved with a second spring 804, and a moving mechanism 9 is arranged between the first connecting plate 801 and the second connecting plate 803, which plays a guiding and resetting role for the movement of the movable plate 1204.

[0041] The moving mechanism 9 includes an electromagnet 901 fixedly connected to the side wall of the first connecting plate 801, and an iron block 902 is fixedly connected to the side wall of the second connecting plate 803. When the electromagnet 901 is energized, the iron block 902 is attracted, so that the second connecting plate 803 and the moving plate 1204 move toward the first connecting plate 801.

[0042] A security sensor alarm method, using the above-mentioned security sensor alarm device, comprises the following steps:

[0043] S1: When the password anti-theft door 10 is opened normally, the password needs to be input through the password lock 11. At the same time, the electromagnet 901 is energized to attract the iron block 902, so that the second connecting plate 803 and the moving plate 1204 move toward the first connecting plate 801, and drive the distance sensor 1205 to move synchronously. At the same time, the second spring 804 is compressed. At this time, the distance sensor 1205 is staggered, so that when the password anti-theft door 10 is opened normally, no alarm is given, and when the password anti-theft door 10 is closed normally, no alarm is given, avoiding false alarms, which is more accurate and reliable;

[0044] S2: After the password anti-theft door 10 is closed, the roller 503 abuts against the top of the door frame 1, thereby pushing the U-shaped plate 501 to move downward, and at the same time, the first spring 403 is compressed. At the same time, the second rotating plate 302 drives the connecting block 303 and the V-shaped block 304 to move downward. At this time, the first rotating plate 1202 can rotate downward along the first rotating shaft 202 under the action of gravity, and at the same time, the push pin 306 slides upward along the side wall of the V-shaped block 304;

[0045] S3: When the password anti-theft door 10 is opened violently, the roller 503 rolls along the top of the door frame 1, thereby driving the second rotating plate 302 to rotate through the second rotating shaft 502, and then driving the connecting block 303 and the V-shaped block 304 to rotate, so that the push pin 306 slides upward along the side wall of the V-shaped block 304, thereby driving the first rotating plate 1202 to rotate upward along the first rotating shaft 202, and driving the sensing block 1203 to move synchronously. At this time, the distance sensor 1205 detects the sensing block 1203 and alarms, so that it can alarm when the password anti-theft door 10 is opened violently, which is safer and more reliable;

[0046] S4: When the password anti-theft door 10 is forgotten to be closed, at this time, the U-shaped plate 501 and the roller 503 can move upward under the action of the first spring 403, and the second rotating plate 302 drives the connecting block 303 and the V-shaped block 304 to move upward synchronously, so that the push pin 306 slides upward along the side wall of the V-shaped block 304, and can push the first rotating plate 1202 to rotate upward along the first rotating shaft 202. At this time, the distance sensor 1205 can also detect the sensing block 1203 and alarm, which is safer and more reliable;

[0047] S5: Moreover, when in use, the fire is detected by the infrared sensor 602 and an alarm is given in time. At the same time, the motor 703 is started, and the rotation of the motor 703 drives the rotation of the third shaft 702, and then drives the U-shaped frame 601 and the infrared sensor 602 to rotate, so that the detection effect is better, more comprehensive, and thus safer and more reliable.

Claims

1. A security sensor alarm device, comprising a door frame (1), a password anti-theft door (10), a password lock (11) and an alarm, characterized in that: The side wall of the password anti-theft door (10) is provided with an alarm mechanism (12), and the alarm mechanism (12) comprises an installation box (1201) fixedly connected to the side wall of the password anti-theft door (10), the alarm is arranged in the installation box (1201), and the inner side wall of the installation box (1201) is rotatably connected to a first rotating plate (1202) via a first rotating mechanism (2), the top of the first rotating plate (1202) is fixedly connected to a sensing block (1203), and the inner side wall of the installation box (1201) is connected to a moving plate (1204) via a reset mechanism (8), the bottom of the moving plate (1204) is fixedly connected to a distance sensor (1205), and the rotation of the first rotating plate (1202) is driven by a driving mechanism (3); The pushing mechanism (3) is provided with a strip-shaped opening (301) at the top of the installation box (1201), and a second rotating plate (302) is inserted in the strip-shaped opening (301). A U-shaped plate (501) is inserted at the top of the installation box (1201), and the U-shaped plate (501) is connected to the bottom of the installation box (1201) via a telescopic mechanism (4), and a side wall of the U-shaped plate (501) is rotatably connected to the second rotating plate (302) via a second rotating mechanism (5). The lower end of the plate (302) is fixedly connected to a connecting block (303), and the side wall of the connecting block (303) is fixedly connected to a V-shaped block (304); the top of the first rotating plate (1202) is fixedly connected to a mounting block (305), and the side wall of the mounting block (305) is fixedly connected to a pushing pin (306), the pushing pin (306) can slide on the side wall of the V-shaped block (304); and the side wall of the U-shaped plate (501) is provided with an alarm component (6) for alarming a fire; The telescopic mechanism (4) comprises two symmetrically arranged sleeves (402) fixedly connected to the bottom of the installation box (1201), and each sleeve (402) is provided with a sleeve rod (401) inserted therein, the upper end of the sleeve rod (401) is fixed to the bottom of the U-shaped plate (501), and the side wall of each sleeve (402) is provided with a first spring (403); The reset mechanism (8) comprises a first connecting plate (801) fixedly connected to the inner side wall of the installation box (1201), and the side wall of the first connecting plate (801) is fixedly connected to two symmetrically arranged T-shaped guide rods (802), the side wall of the T-shaped guide rod (802) is sleeved with a second connecting plate (803), and the second connecting plate (803) is fixed to the top of the movable plate (1204), the side wall of each T-shaped guide rod (802) is sleeved with a second spring (804), and a movable mechanism (9) is arranged between the first connecting plate (801) and the second connecting plate (803); The moving mechanism (9) comprises an electromagnet (901) fixedly connected to the side wall of the first connecting plate (801), and an iron block (902) is fixedly connected to the side wall of the second connecting plate (803).

2. A security sensor alarm device according to claim 1, characterized in that: The first rotating mechanism (2) comprises two symmetrically arranged fixed blocks (201) fixedly connected to the inner side wall of the installation box (1201), and the first rotating plate (1202) is rotatably connected to the side wall of the fixed block (201) via a first rotating shaft (202).

3. A security sensor alarm device according to claim 2, characterized in that: The second rotating mechanism (5) comprises a roller (503) inserted in the U-shaped plate (501); the roller (503) is rotatably connected to the side wall of the U-shaped plate (501) via a second rotating shaft (502); and the second rotating plate (302) is fixed to one end of the second rotating shaft (502).

4. A security sensor alarm device according to claim 3, characterized in that: The alarm component (6) comprises a U-shaped frame (601), a side wall of the U-shaped frame (601) is fixedly provided with an infrared sensor (602), and the U-shaped frame (601) is connected to the side wall of the U-shaped plate (501) via a third rotating mechanism (7).

5. A security sensor alarm device according to claim 4, characterized in that: The third rotating mechanism (7) comprises two symmetrically arranged supporting blocks (701) fixedly connected to the side walls of the U-shaped plate (501), and the U-shaped frame (601) is rotatably connected to the side walls of the supporting blocks (701) via a third rotating shaft (702). The side walls of the supporting blocks (701) are fixedly connected to a motor (703), and the output end of the motor (703) is fixed to one end of the third rotating shaft (702).

6. A security sensor alarm method, using a security sensor alarm device as claimed in claim 5, characterized in that: The following steps are involved: S1: When the password anti-theft door (10) is opened normally, the password needs to be input through the password lock (11). At the same time, the electromagnet (901) is energized to attract the iron block (902), so that the second connecting plate (803) and the movable plate (1204) move in a direction close to the first connecting plate (801), and drive the distance sensor (1205) to move synchronously. At the same time, the second spring (804) is compressed. At this time, the distance sensor (1205) is staggered, so that when the password anti-theft door (10) is opened normally, no alarm is issued, and when the password anti-theft door (10) is closed normally, no alarm is issued, thereby avoiding false alarms; S2: After the password anti-theft door (10) is closed, the roller (503) abuts against the top of the door frame (1), thereby pushing the U-shaped plate (501) to move downward, and at the same time, the first spring (403) is compressed. At the same time, the second rotating plate (302) drives the connecting block (303) and the V-shaped block (304) to move downward. At this time, the first rotating plate (1202) can rotate downward along the first rotating shaft (202) under the action of gravity, and at the same time, the push pin (306) slides upward along the side wall of the V-shaped block (304); S3: When the password anti-theft door (10) is opened by force, the roller (503) rolls along the top of the door frame (1), thereby driving the second rotating plate (302) to rotate through the second rotating shaft (502), thereby driving the connecting block (303) and the V-shaped block (304) to rotate, so that the push pin (306) slides upward along the side wall of the V-shaped block (304), thereby driving the first rotating plate (1202) to rotate upward along the first rotating shaft (202), and driving the sensing block (1203) to move synchronously. At this time, the distance sensor (1205) detects the sensing block (1203) and alarms, so that an alarm can be sounded when the password anti-theft door (10) is opened by force; S4: When the password anti-theft door (10) is forgotten to be closed, the U-shaped plate (501) and the roller (503) can move upward under the action of the first spring (403), and the second rotating plate (302) drives the connecting block (303) and the V-shaped block (304) to move upward synchronously, so that the pushing pin (306) slides upward along the side wall of the V-shaped block (304), and can push the first rotating plate (1202) to rotate upward along the first rotating shaft (202). At this time, the distance sensor (1205) can also detect the sensing block (1203) and issue an alarm; S5: When in use, the infrared sensor (602) is used to detect fire and give an alarm in time. At the same time, the motor (703) is started. The rotation of the motor (703) drives the third rotating shaft (702) to rotate, thereby driving the U-shaped frame (601) and the infrared sensor (602) to rotate.

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