Door closer for monitoring opening and closing states of door body of fireproof door and monitoring method thereof

Abstract

The invention provides a door closer for monitoring the opening and closing state of a door body of a fireproof door and a monitoring method thereof.The door closer comprises a main body, a hydraulic press, a first connecting rod and a second connecting rod, and the main body comprises a shell, a main control board, a door opening in-place detection mechanism, a door closing in-place detection mechanism, a positioning and releasing mechanism and a bottom plate; the door opening in-place detection mechanism detects that a door body of the fireproof door is opened in place and sends a signal to the main control board, the main control board sends the signal to the monitoring center, when the fireproof door is closed in place, the door closing in-place detection mechanism detects that the door body of the fireproof door is closed in place and sends the signal to the main control board, and the main control board sends the signal to the monitoring center. In this way, the opening and closing state of the door body of the fireproof door can be accurately monitored, potential safety hazards are avoided, and the device is easy to install, low in debugging difficulty and suitable for various installation scenes through a small machine body.

Description

Technical Field

[0001] The present invention belongs to the technical field of indoor fire-fighting equipment, and particularly relates to a door closer for monitoring the opening and closing state of a fire door body and a monitoring method therefor. Background Art

[0002] A fire door is composed of a fixedly arranged door frame and a door body rotatably connected to the door frame. A fire door closer is installed on the door frame and the door body of the fire door for opening or closing the door body of the fire door. The existing link-type door closers usually cannot effectively monitor the opening and closing state of the door body of the fire door, which is not conducive to the centralized management of fire doors by the monitoring center and poses a fire hazard. The existing door closers that can be used to monitor the opening and closing state of the door body of the fire door usually adopt a chute structure. For example, a door closer for monitoring the open state of a fire door with the authorization announcement number CN204326805U determines the opening and closing state of the door body of the fire door by monitoring the position of a slider. During installation, the relative positions of the magnetron and the slider need to be accurately adjusted to ensure that the magnetron and the slider can be within an effective magnetic induction distance when the door body of the fire door is opened in place. Otherwise, there will be a problem that the monitored opening state of the door body of the fire door does not match the actual situation. Therefore, its installation and debugging are extremely troublesome. After long-term use, the positions of the magnetron and the slider become loose, which may also lead to incorrect monitoring results. Moreover, its chute structure results in an overly long and large body of the door closer, which has many installation limitations in actual installation and is difficult to install in relatively narrow spaces. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a door closer for monitoring the opening and closing state of a fire door body and a monitoring method therefor, which are simple to install, have a low debugging difficulty, accurate monitoring methods, can effectively monitor the opening and closing state of the door body of the fire door, avoid potential safety hazards, and can also be applicable to various installation scenarios with a small body.

[0004] The technical solution adopted by the present application to solve its technical problems is: A door closer for monitoring the opening and closing state of a fire door body, comprising a main body, a hydraulic device, a first link, and a second link;

[0005] The main body includes a housing, a main control board, an open-in-place detection mechanism, a close-in-place detection mechanism, a positioning and release mechanism, and a bottom plate;

[0006] The housing is detachably connected to the bottom plate. The main control board, the open-in-place detection mechanism, the close-in-place detection mechanism, and the positioning and release mechanism are all fixed on the bottom plate. The main control board is electrically connected to a monitoring center, and the main control board is respectively electrically connected to the open-in-place detection mechanism, the close-in-place detection mechanism, and the positioning and release mechanism;

[0007] One end of the first connecting rod is rotatably connected to the bottom plate, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, and the end of the second connecting rod away from the first connecting rod is rotatably connected to the hydraulic actuator;

[0008] The hydraulic actuator is fixedly arranged on the door body of the fire door. When the door body of the fire door is opened, the hydraulic actuator drives the second connecting rod to rotate, and the second connecting rod drives the first connecting rod to rotate. When the fire door is opened in place, the first connecting rod forms an angle a with the bottom edge or the extension line of the bottom edge of the bottom plate. The positioning and releasing mechanism locks the first connecting rod. The door-opening-in-place detection mechanism detects that the door body of the fire door is opened in place by detecting the position of the first connecting rod and sends a signal to the main control board, and the main control board then transmits the signal to the monitoring center;

[0009] When it is necessary to close the door body of the fire door, the monitoring center sends a door-closing signal to the main control board. The main control board drives the positioning and releasing mechanism to release the lock on the first connecting rod, or directly applies a force in the door-closing direction to the door body of the fire door. When the force in the door-closing direction reaches a predetermined value, the first connecting rod is unlocked from the positioning and releasing mechanism;

[0010] The main body is fixedly arranged on or near the door frame. When the door body of the fire door is closed in place, the door-closing-in-place detection mechanism detects that the door body of the fire door is closed in place and sends a signal to the main control board, and the main control board then transmits the signal to the monitoring center.

[0011] Specifically, the door-opening-in-place detection mechanism is a first microswitch. A first elastic sheet is arranged on the first microswitch. The first elastic sheet is arranged in the direction towards the first connecting rod. When the first connecting rod forms an angle a with the bottom edge of the bottom plate, it represents that the door is opened in place. The first connecting rod presses on the elastic sheet. At this time, the first microswitch changes from the off state to the on state or from the on state to the off state. The main control board receives the state change signal of the first microswitch and transmits the state change signal to the monitoring center.

[0012] Specifically, a mounting post is provided on the base plate, and the door closing detection mechanism includes a second microswitch, a torsion spring, and a seesaw. The second microswitch is provided with a second elastic sheet, the torsion spring is sleeved on the mounting post, a mounting hole is provided in the middle of the seesaw, the torsion spring is fixed in the mounting hole, the two ends of the seesaw are respectively a first end and a second end, the second microswitch is fixed on the base plate and arranged adjacent to the first end, when the door body of the fire door is not closed, the first end is pressed on the elastic sheet under the action of the torsional force of the torsion spring, and the second microswitch is always in an on or off state, when the door body of the fire door is closed, the door body of the fire door presses the second end, the first end tilts up and leaves the second elastic sheet, the second microswitch changes from an on state to an off state or from an off state to an on state, and the main control board receives the state change signal of the second microswitch and transmits the state change signal to the monitoring center.

[0013] Preferably, the door opening detection mechanism may also be a pressure sensor, an angular displacement sensor, a photoelectric sensor or a magnetic induction sensor.

[0014] Preferably, the door closing detection mechanism may also only include a micro switch, a pressure sensor, an angular displacement sensor, a photoelectric sensor or a magnetic induction sensor.

[0015] Preferably, the positioning and releasing mechanism is an electromagnetic locking mechanism, a mechanical buckle or a mechanical locking tongue mechanism.

[0016] Specifically, the first connecting rod and / or the second connecting rod is a telescopic connecting rod with adjustable length, a locking structure is provided between the first connecting rod and the second connecting rod, and the locking structure is a sliding rod locking structure or a gear locking structure.

[0017] Specifically, when the door body of the fire door is fully opened, the angle a formed by the first connecting rod and the bottom edge of the bottom plate is 60-150°.

[0018] The present invention also provides a method for monitoring the opening and closing state of a fire door through the door closer for monitoring the opening and closing state of a fire door. When the door body of the fire door is fully closed, the door body of the fire door presses the second end of the second micro switch, causing the first end to tilt and leave the second elastic sheet. At this time, the second micro switch changes from an on state to an off state or from an off state to an on state. The main control board receives a state change signal of the second micro switch and transmits the state change signal to a monitoring center. The monitoring center monitors that the door body of the fire door is in a fully closed state.

[0019] When the door body of the fire door is opened, the hydraulic device on the door body moves along with the door body. The hydraulic device drives the second connecting rod to rotate, and the second connecting rod drives the first connecting rod to rotate. When the fire door is opened in place, the first connecting rod forms an angle a with the bottom edge or the extension line of the bottom edge of the bottom plate. The positioning and releasing mechanism locks the first connecting rod. The door-opening-in-place detection mechanism detects that the door body of the fire door is opened in place by detecting the position of the first connecting rod and sends a signal to the main control board. The main control board then transmits the signal to the monitoring center, and the monitoring center monitors that the door body of the fire door is in the opened-in-place state.

[0020] Specifically, when the door body of the fire door is opened in place, the angle a formed by the first connecting rod and the bottom edge or the extension line of the bottom edge of the bottom plate is 60-150°.

[0021] The invention is simple to install, has a low debugging difficulty, and an accurate monitoring method. By directly detecting the position of the first connecting rod through the door-opening-in-place detection mechanism, it can directly and accurately determine whether the door body of the fire door is opened in place. By directly detecting the position of the door body of the fire door through the door-closing-in-place detection mechanism, it can directly and accurately determine whether the door body of the fire door is closed in place. Such a setting does not require other additional components to determine the position of the door body of the fire door, can very directly and reliably monitor the opening and closing state of the fire door, reduces the probability of monitoring errors, and avoids potential safety hazards. Moreover, the invention can also reduce the installation difficulty with its small body and is suitable for various installation scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a structural diagram of the main body, hydraulic device, first connecting rod and second connecting rod of the door closer for monitoring the opening and closing state of the fire door provided by the embodiment of the present invention assembled together.

[0024] Figure 2 It is a structural diagram of the main body of the door closer for monitoring the opening and closing state of the fire door provided by the embodiment of the present invention.

[0025] Figure 3 It is a bottom view schematic diagram of the door closer for monitoring the opening and closing state of the fire door provided by the embodiment of the present invention installed on the fire door (the fire door is in the opened-in-place state).

[0026] Figure 4It is a schematic bottom view of the door closer for monitoring the opening and closing state of the fire door provided by the embodiment of the present invention installed on the fire door (the fire door is in the opening process).

[0027] Figure 5 It is a schematic bottom view of the door closer for monitoring the opening and closing state of the fire door provided by the embodiment of the present invention installed on the fire door (the fire door is in the fully closed state).

[0028] Figure 6 It is a schematic view of another angle of the door closer for monitoring the opening and closing state of the fire door provided by the embodiment of the present invention installed on the fire door (the fire door is in the opening process). Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] As Figure 1-2 shown, a door closer for monitoring the opening and closing state of the door body of a fire door in an embodiment of the present invention includes a main body 1, a hydraulic device 2, a first connecting rod 3 and a second connecting rod 4;

[0031] The main body 1 includes a housing 11, a main control board 12, an open position detection mechanism 13, a closed position detection mechanism 14, a positioning and release mechanism 15 and a bottom plate 16;

[0032] The housing 11 is detachably connected to the bottom plate 16. The main control board 12, the open position detection mechanism 13, the closed position detection mechanism 14 and the positioning and release mechanism 15 are all fixedly arranged on the bottom plate 16. The main control board 12 is electrically connected to the monitoring center, and the main control board 12 is respectively electrically connected to the open position detection mechanism 13, the closed position detection mechanism 14 and the positioning and release mechanism 15;

[0033] One end of the first connecting rod 3 is rotatably connected to the bottom plate 16, the other end of the first connecting rod 3 is rotatably connected to one end of the second connecting rod 4, and the end of the second connecting rod 4 far from the first connecting rod 3 is rotatably connected to the hydraulic device 2;

[0034] The hydraulic device 2 is fixedly arranged on the door body of the fire door. When the door body of the fire door is opened, the hydraulic device 2 drives the second connecting rod 4 to rotate, and the second connecting rod 4 drives the first connecting rod 3 to rotate. When the fire door is opened in place, an included angle a is formed between the first connecting rod 3 and the bottom edge or the extension line of the bottom edge of the bottom plate 16. The positioning and release mechanism 15 locks the first connecting rod 3, and the open position detection mechanism 13 detects that the door body of the fire door is opened in place by detecting the position of the first connecting rod and sends a signal to the main control board 12, and the main control board 12 then transmits the signal to the monitoring center;

[0035] When it is necessary to close the door body of the fire door, the monitoring center sends a door closing signal to the main control board 12. The main control board 12 drives the positioning and release mechanism 15 to release the locking of the first connecting rod 3, or directly applies a force in the door closing direction to the door body of the fire door. When the force in the door closing direction reaches a predetermined value, the first connecting rod 3 is unlocked from the positioning and release mechanism 15;

[0036] The main body 1 is fixed on or near the door frame. When the door body of the fire door is closed in place, the door closing in-place detection mechanism 14 detects that the door body of the fire door is closed in place and sends a signal to the main control board 12, and the main control board 12 then transmits the signal to the monitoring center.

[0037] In the present invention, the door opening in-place detection mechanism 13 directly detects the position of the first connecting rod 3, and can directly and accurately judge whether the door body of the fire door is opened in place. The door closing in-place detection mechanism 14 directly detects the position of the door body of the fire door, and can directly and accurately judge whether the door body of the fire door is closed in place. Such a setting does not require other additional components to judge the position of the door body of the fire door, and can directly and reliably monitor the opening and closing state of the door body of the fire door, reducing the probability of detection errors, avoiding potential safety hazards, and also reducing the installation and debugging difficulty. Moreover, the present invention can also reduce the installation difficulty with its small body and is applicable to various installation scenarios.

[0038] Specifically, referring to Figure 2 , the door opening in-place detection mechanism 13 is the first micro switch 131. The first micro switch 131 is provided with a first elastic sheet 1311. The first elastic sheet 1311 is arranged in the direction towards the first connecting rod 3. When the first connecting rod 3 forms an angle a with the bottom edge of the bottom plate 16, it represents that the door is opened in place. The first connecting rod 3 presses on the elastic sheet 1311, and the first micro switch 131 changes from the off state to the on state or from the on state to the off state. The main control board 12 receives the state change signal of the first micro switch 131 and transmits the state change signal to the monitoring center. With such a setting, the monitoring center can directly detect the position of the first connecting rod 3 through the door opening in-place detection mechanism 13 to judge whether the door body of the fire door is opened in place, which is very accurate and effective.

[0039] Specifically, referring to Figure 1-2, a mounting post (not shown) is provided on the bottom plate 16, the door closing detection mechanism 14 includes a second micro switch 141, a torsion spring 142, and a seesaw 143. The second micro switch 141 is provided with a second elastic piece 1411, the torsion spring 142 is sleeved on the mounting post (not shown), a mounting hole 1433 is provided in the middle of the seesaw 143, the torsion spring 142 is fixed in the mounting hole 1433, and the two ends of the seesaw 143 are respectively a first end 1431 and a second end 1432. The second micro switch 141 is fixed on the bottom plate 16 and is arranged near the first end 1431. When the door body of the fire door is not closed in place, the first end 1431 is pressed on the elastic piece 1411 under the torsion force of the torsion spring 142, and the second micro switch 141 is always in In the on or off state, when the door body of the fire door is closed, the door body of the fire door presses the second end 1432, the first end 1431 tilts up and leaves the second spring piece 1411, and the second microswitch 141 changes from the on state to the off state or from the off state to the on state, and the main control board 12 receives the state change signal of the second microswitch 141 and transmits the state change signal to the monitoring center; through the combination of the second microswitch 141, the torsion spring 14 and the rocker 143, the door body of the fire door can be more easily contacted with the door closing position detection mechanism 14 when the door is closed and trigger the door closing position detection mechanism 14 to output a signal, so that the monitoring center can more accurately and effectively detect whether the door body of the fire door is closed.

[0040] Preferably, the door opening detection mechanism 13 can also be a pressure sensor, an angular displacement sensor, a photoelectric sensor or a magnetic induction sensor.

[0041] Preferably, the door closing detection mechanism 14 may also only include a micro switch, a pressure sensor, an angular displacement sensor, a photoelectric sensor or a magnetic induction sensor.

[0042] Preferably, the positioning and releasing mechanism 15 is an electromagnetic locking mechanism, a mechanical buckle or a mechanical locking tongue mechanism.

[0043] Specifically, the first connecting rod 3 and / or the second connecting rod 4 is a telescopic connecting rod with adjustable length. A locking structure is provided between the first connecting rod 3 and the second connecting rod 4. The locking structure is a sliding rod locking structure or a gear locking structure, which makes it easy to adjust the opening angle of the door body of the fire door as needed.

[0044] Specifically, when the door body of the fire door is fully opened, the angle a formed by the first connecting rod 3 and the bottom edge of the bottom plate 16 or the extension line of the bottom edge is 60-150°, which makes it easier to accurately monitor the opening state of the fire door.

[0045] As a monitoring method corresponding to the above structure:

[0046] A method for detecting the opening and closing state of the door body of a fire door by a door closer for monitoring the opening and closing state of the door body of the fire door. When the door body of the fire door closes in place, the door body of the fire door presses the second end 1432 of the second micro switch 141, causing the first end 1431 to tilt away from the second elastic piece 1411. At this time, the second micro switch 141 changes from a conducting state to a non-conducting state or from a non-conducting state to a conducting state. The main control board 12 receives the state change signal of the second micro switch 141 and transmits the state change signal to the monitoring center, and the monitoring center monitors that the door body of the fire door is in the closed-in-place state;

[0047] When the door body of the fire door opens, the hydraulic device 2 on the door body moves along with the door body. The hydraulic device 2 drives the second connecting rod 4 to rotate, and the second connecting rod 4 drives the first connecting rod 3 to rotate. When the fire door opens in place, the first connecting rod 3 forms an angle a with the bottom edge or the extension line of the bottom edge of the bottom plate 16. The positioning and releasing mechanism (15) locks the first connecting rod 3. The door-opening-in-place detection mechanism 13 detects that the door body of the fire door opens in place by detecting the position of the first connecting rod 3 and sends a signal to the main control board 12, and the main control board 12 then transmits the signal to the monitoring center, and the monitoring center monitors that the door body of the fire door is in the door-opening-in-place state.

[0048] Specifically, when the door body of the fire door opens in place, the angle a formed by the first connecting rod 3 and the bottom edge or the extension line of the bottom edge of the bottom plate 16 is 60-150°.

[0049] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A door closer for monitoring the open and closed state of a fire door, characterized in that: It comprises a main body (1), a hydraulic device (2), a first connecting rod (3) and a second connecting rod (4); The main body (1) comprises a housing (11), a main control board (12), a door opening detection mechanism (13), a door closing detection mechanism (14), a positioning and releasing mechanism (15) and a bottom plate (16); The housing (11) is detachably connected to the bottom plate (16); the main control board (12), the door opening detection mechanism (13), the door closing detection mechanism (14) and the positioning and releasing mechanism (15) are all fixedly arranged on the bottom plate (16); the main control board (12) is electrically connected to the monitoring center; and the main control board (12) is electrically connected to the door opening detection mechanism (13), the door closing detection mechanism (14) and the positioning and releasing mechanism (15) respectively; One end of the first connecting rod (3) is rotatably connected to the bottom plate (16), the other end of the first connecting rod (3) is rotatably connected to one end of the second connecting rod (4), and the end of the second connecting rod (4) away from the first connecting rod (3) is rotatably connected to the hydraulic press (2); The hydraulic press (2) is fixed on the door body of the fire door. When the door body of the fire door is opened, the hydraulic press (2) drives the second connecting rod (4) to rotate, and the second connecting rod (4) drives the first connecting rod (3) to rotate. When the fire door is fully opened, the first connecting rod (3) forms an angle a with the bottom edge of the bottom plate (16) or the extension line of the bottom edge. The positioning and releasing mechanism (15) locks the first connecting rod (3). The door opening detection mechanism (13) detects that the door body of the fire door is fully opened by detecting the position of the first connecting rod (3) and sends a signal to the main control board (12). The main control board (12) then transmits the signal to the monitoring center. When the door body of the fire door needs to be closed, the monitoring center sends a door closing signal to the main control board (12), and the main control board (12) drives the positioning and releasing mechanism (15) to release the lock on the first connecting rod (3), or directly applies a force in the door closing direction to the door body of the fire door, and when the force in the door closing direction reaches a predetermined value, the first connecting rod (3) is unlocked from the positioning and releasing mechanism (15); The main body (1) is fixedly mounted on or near the door frame of the fire door. When the door body of the fire door is closed, the door closing detection mechanism (14) detects that the door body of the fire door is closed and sends a signal to the main control board (12). The main control board (12) then transmits the signal to the monitoring center.

2. The door closer for monitoring the opening and closing state of a fire door according to claim 1, characterized in that: The door opening detection mechanism (13) is a first micro switch (131). The first micro switch (131) is provided with a first spring sheet (1311). The first spring sheet (1311) is arranged in the direction of the first connecting rod (3). When the first connecting rod (3) and the bottom edge of the bottom plate (16) form an angle a, it represents that the door is fully opened. The first connecting rod (3) presses on the spring sheet (1311). At this time, the first micro switch (131) changes from an off state to an on state or from an on state to an off state. The main control board (12) receives a state change signal of the first micro switch (131) and transmits the state change signal to a monitoring center.

3. The door closer for monitoring the opening and closing state of a fire door according to claim 1, characterized in that: The bottom plate (16) is provided with a mounting column, and the door-closed position detection mechanism (14) comprises a second micro switch (141), a torsion spring (142), and a seesaw (143). The second micro switch (141) is provided with a second elastic sheet (1411). The torsion spring (142) is sleeved on the mounting column. A mounting hole (1433) is provided in the middle of the seesaw (143). The torsion spring (142) is fixedly arranged in the mounting hole (1433). The two ends of the seesaw (143) are respectively a first end (1431) and a second end (1432). The second micro switch (141) is fixedly arranged on the bottom plate (16) and is arranged adjacent to the first end (1431). When the door body of the fire door is not fully closed, the first end (1431) is pressed on the spring (1411) under the action of the torsion force of the torsion spring (142), and the second micro switch (141) is always in an on or off state; when the door body of the fire door is fully closed, the door body of the fire door presses the second end (1432), the first end (1431) tilts up and leaves the second spring (1411), the second micro switch (141) changes from an on state to an off state or from an off state to an on state, and the main control board (12) receives a state change signal of the second micro switch (141) and transmits the state change signal to a monitoring center.

4. The door closer for monitoring the opening and closing state of a fire door according to claim 1, characterized in that: The door opening detection mechanism (13) can also be a pressure sensor, an angular displacement sensor, a photoelectric sensor or a magnetic induction sensor.

5. The door closer for monitoring the opening and closing state of a fire door according to claim 1, characterized in that: The door closing detection mechanism (14) may also only include a micro switch, a pressure sensor, an angular displacement sensor, a photoelectric sensor or a magnetic induction sensor.

6. The door closer for monitoring the opening and closing state of a fire door according to claim 1, characterized in that: The positioning and releasing mechanism (15) is an electromagnetic locking mechanism, a mechanical buckle or a mechanical locking tongue mechanism.

7. The door closer for monitoring the opening and closing state of a fire door according to claim 1, characterized in that: The first connecting rod (3) and / or the second connecting rod (4) are telescopic connecting rods whose lengths can be adjusted. A locking structure is provided between the first connecting rod (3) and the second connecting rod (4), and the locking structure is a sliding rod locking structure or a gear locking structure.

8. The door closer for monitoring the open and closed state of a fire door according to claim 1, characterized in that: When the door body of the fire door is fully opened, the angle a formed by the first connecting rod (3) and the bottom edge of the bottom plate (16) or the extension line of the bottom edge is 60-150°.

9. A method for monitoring the opening and closing state of a fire door by using the door closer for monitoring the opening and closing state of a fire door according to claim 3, characterized in that: When the door body of the fire door is fully closed, the door body of the fire door presses the second end (1432) of the second micro switch (141), causing the first end (1431) to tilt up and leave the second spring sheet (1411). At this time, the second micro switch (141) changes from an on state to an off state or from an off state to an on state. The main control board (12) receives a state change signal of the second micro switch (141) and transmits the state change signal to the monitoring center. The monitoring center monitors that the door body of the fire door is in a fully closed state. When the door body of the fire door is opened, the hydraulic machine (2) on the door body moves with the door body, the hydraulic machine (2) drives the second connecting rod (4) to rotate, and the second connecting rod (4) drives the first connecting rod (3) to rotate. When the fire door is fully opened, the first connecting rod (3) forms an angle a with the bottom edge of the bottom plate (16) or the extension of the bottom edge, the positioning and releasing mechanism (15) locks the first connecting rod (3), and the door opening detection mechanism (13) detects that the door body of the fire door is fully opened by detecting the position of the first connecting rod (3) and sends a signal to the main control board (12). The main control board (12) then transmits the signal to the monitoring center, and the monitoring center monitors that the door body of the fire door is in the fully opened state.

10. The method for monitoring the door opening and closing state of a fire door by means of a door closer for monitoring the door opening and closing state of a fire door according to claim 9, characterized in that: When the door body of the fire door is fully opened, the angle a formed by the first connecting rod (3) and the bottom edge of the bottom plate (16) or the extension line of the bottom edge is 60-150°.

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