A connecting rod type door closer for monitoring the opening and closing state of a door body of a fireproof door

Abstract

The utility model provides a kind of for monitoring the door body opening and closing state of fire door connecting rod type door closer, including main body, hydraulic module, first connecting rod and second connecting rod, main body includes shell, main control board, door opening to position detection mechanism, door closing to position detection mechanism, positioning and release mechanism, connecting rod shaft sleeve assembly and bottom plate, main control board is electrically connected with door opening to position detection mechanism and door closing to position detection mechanism respectively, locking portion is equipped on positioning and release mechanism, connecting rod shaft sleeve assembly includes shaft sleeve module and door opening and closing to position detection module, recess that is matched with locking portion is equipped on door opening and closing to position detection module;The one end of first connecting rod is connected with shaft sleeve, the other end is connected with the one end of second connecting rod, the other end of second connecting rod is rotatably connected with hydraulic module;Thus only detecting the position of door closer connecting rod can detect door opening and closing to position, avoid the emergence of security risk, and reduce production cost, installation and debugging are also very simple.

Description

Technical Field

[0001] This utility model belongs to the field of fire-fighting equipment technology, and in particular relates to a linkage-type door closer for monitoring the opening and closing status of fire doors. Background Technology

[0002] Fire door closers are used to open or close fire doors. Existing linkage-type door closers often cannot effectively monitor the opening and closing status of fire doors, which is not conducive to centralized management of fire doors in the monitoring center and poses fire hazards. Existing linkage-type door closers that can be used to monitor fire doors usually cannot achieve door opening and closing detection simply by detecting the position of the door closer linkage. Instead, door opening and closing detection devices need to be installed on the door frame and door body of the fire door respectively to detect the position of the door closer linkage and the position of the fire door to achieve door opening and closing detection. This has many components, high production costs, and a very complicated installation process, making debugging very troublesome. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a linkage-type door closer for monitoring the opening and closing status of fire doors. It can detect whether the door is fully open or fully closed by monitoring the position of the door closer linkage. It can effectively monitor the opening and closing status of fire doors, avoid safety hazards, reduce production costs, and is simple to debug and install.

[0004] To achieve the above objectives, the technical solution adopted in this application embodiment is: a linkage-type door closer for monitoring the opening and closing status of fire doors.

[0005] Includes the main body, hydraulic module, first link and second link;

[0006] The main body includes an outer shell, a main control board, a door opening detection mechanism, a door closing detection mechanism, a positioning and release mechanism, a connecting rod bushing assembly, and a base plate;

[0007] The outer shell is detachably connected to the base plate. The main control board, the door opening detection mechanism, the door closing detection mechanism, and the positioning and release mechanism are fixed on the base plate. The main control board is electrically connected to the door opening detection mechanism and the door closing detection mechanism respectively. The positioning and release mechanism is provided with a locking part.

[0008] The connecting rod bushing assembly is perpendicularly arranged and rotatably connected to the base plate. The connecting rod bushing assembly includes a bushing module and a door opening / closing position detection module. An annular boss is fixed at one end of the bushing module near the base plate.

[0009] The door opening / closing detection module includes a first locking rod, a second locking rod, a door closing detection plate, and a door opening detection plate. The first locking rod is provided with a first locking part.

[0010] The door closing detection plate and the door opening detection plate are sequentially sleeved on the outer peripheral wall of the bushing module. The door closing detection plate is located on the side of the door opening detection plate away from the annular boss. The first locking rod is threadedly connected to the inner peripheral wall of the bushing module. The first locking part is located on the side of the door closing detection plate away from the door opening detection plate. When the first locking rod is rotated clockwise, the first locking part moves towards the annular boss. When the first locking part moves to a predetermined position, the first locking rod presses the door closing detection plate and the door opening detection plate against the annular boss.

[0011] The door closing detection plate is fixed with a door closing detection protrusion and a first through hole. The second locking rod is threadedly connected to the first through hole. When the second locking rod is rotated clockwise to a predetermined position, the second locking rod passes through the first through hole and abuts against the outer peripheral wall of the bushing module. The second locking rod locks the door closing detection plate on the bushing module.

[0012] The door opening detection plate is fixed with a door opening detection protrusion and a groove that cooperates with the locking part;

[0013] One end of the first connecting rod is fixedly connected to the bushing module, and the other end of the first connecting rod is rotatably connected to one end of the second connecting rod. The end of the second connecting rod away from the first connecting rod is rotatably connected to the hydraulic module. The main body is installed on or near the fire door frame, and the hydraulic module is installed on the fire door body. Alternatively, the main body is installed on the fire door body, and the hydraulic module is installed on or near the fire door frame.

[0014] Specifically, the bushing module includes a bushing base, an annular pressure plate, and a locking sleeve. The bushing base includes a bushing rod and the annular boss. The first locking rod is threaded to the inner circumferential wall of the bushing rod. The door opening detection plate is sleeved on the outer circumferential wall of the bushing rod. The annular pressure plate is sleeved on the outer circumferential wall of the bushing rod and is located on the side of the door opening detection plate away from the annular boss. The door closing detection plate is sleeved on the annular pressure plate and is located on the side of the annular pressure plate away from the door opening detection plate. The locking sleeve is sleeved on the first locking rod and is located between the first locking part and the door closing detection plate.

[0015] Specifically, the locking part is a sphere, and the positioning and releasing mechanism further includes a limiting seat, a limiting rod, a control rod, a spring, a top block, a spring sleeve, and a limiting sleeve;

[0016] The limiting seat is fixed to the base plate. The limiting seat is provided with a first limiting groove, a second limiting groove, and a limiting shaft. The limiting rod is provided with a first limiting part. The control rod includes a first end and a second end. The first end is provided with a second limiting part that cooperates with the first limiting part. The control rod slides in the first limiting groove and the second end of the control rod protrudes outside the first limiting groove. The limiting rod is rotatably connected to the limiting shaft. The first limiting part is located in the second limiting groove. When the limiting rod rotates circumferentially along the limiting shaft, the first limiting part on the limiting rod slides in the second limiting groove. When the first limiting part slides to a predetermined position C, the first limiting part and the second limiting part engage to limit the control rod.

[0017] The limiting sleeve has a cavity, a first opening, and a second opening. The spring sleeve is fixedly disposed in the cavity. The second end of the control rod is fixedly connected to the limiting sleeve, or the second end of the control rod extends into the limiting sleeve through the first opening and abuts against the spring sleeve. The spring is disposed in the spring sleeve, with one end of the spring abutting against the inner end wall of the spring sleeve near the end of the control rod, and the other end of the spring abutting against the top block. A portion of the top block is located inside the spring sleeve, or the entire top block is located inside the spring sleeve. A slider is fixedly disposed on the top block. A groove is formed on the outer peripheral wall of the spring sleeve, and the slider slides in the groove. The sphere is disposed in the cavity and is located on the side of the top block away from the spring. The height of the second opening is less than the diameter of the sphere, and the height of the second opening is greater than the thickness of the groove portion of the door opening detection plate.

[0018] Specifically, the second end of the control lever is further provided with a third limiting part. When the control lever moves to a certain position in the direction of approaching the limiting seat, the third limiting part abuts against the limiting seat.

[0019] Specifically, the door opening detection mechanism is a first micro switch, which has a first spring piece located on the side of the first micro switch near the door opening detection plate. The door closing detection mechanism is a second micro switch, which has a second spring piece located on the side of the second micro switch near the door closing detection plate. When the fire door is fully open, the first spring piece abuts against the door opening detection protrusion. When the fire door is fully closed, the second spring piece abuts against the door closing detection protrusion.

[0020] Specifically, the door opening detection plate has a first tooth structure on the side surface near the annular boss, and the annular boss has a second tooth structure that cooperates with the first tooth structure on the side surface near the door opening detection plate.

[0021] Specifically, the inner peripheral wall of the door opening detection plate is provided with a third meshing structure, and the outer peripheral wall of the bushing module is provided with a fourth meshing structure that cooperates with the third meshing structure.

[0022] Specifically, the outer casing is provided with a wiring baffle, the wiring baffle has a wiring hole, and the wiring baffle is detachably connected to the outer casing.

[0023] Preferably, the door opening detection mechanism and the door closing detection mechanism are pressure sensors, angular displacement sensors, light sensors, or magnetic induction sensors.

[0024] This utility model, by setting up an opening position detection mechanism, a closing position detection mechanism, and an opening / closing position detection module, can detect the opening and closing positions by only detecting the position of the door closer linkage. It can effectively monitor the opening and closing status of the fire door, avoid safety hazards, and greatly reduce the number of components, thereby reducing production costs. It is also very simple to debug and install. Attached Figure Description

[0025] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of a linkage-type door closer for monitoring the opening and closing status of fire doors, provided in an embodiment of this utility model.

[0027] Figure 2 This is an exploded view of the linkage bushing assembly of the linkage-type door closer for monitoring the opening and closing status of fire doors, provided in an embodiment of this utility model.

[0028] Figure 3 This is an exploded view of the positioning and release mechanism of the linkage-type door closer for monitoring the opening and closing status of fire doors provided in this embodiment of the utility model.

[0029] Figure 4 This is a cross-sectional view of the positioning and release mechanism of the linkage-type door closer for monitoring the opening and closing status of fire doors provided in this embodiment of the utility model.

[0030] Figure 5This is a structural diagram showing the assembly of the positioning and release mechanism, the door opening detection mechanism, the door closing detection mechanism, and the connecting rod bushing assembly for monitoring the opening and closing status of fire doors, as provided in this embodiment of the utility model.

[0031] Figure 6 This is a schematic diagram of the outer shell of the main body of the linkage-type door closer for monitoring the opening and closing status of fire doors provided in this embodiment of the utility model. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0033] Reference Figure 1-4 This utility model embodiment provides a linkage-type door closer for monitoring the opening and closing status of fire doors, including a main body 1, a hydraulic module 2, a first linkage 3, and a second linkage 4;

[0034] The main body 1 includes a shell 11, a main control board 12, a door opening detection mechanism 13, a door closing detection mechanism 14, a positioning and release mechanism 15, a connecting rod bushing assembly 16, and a base plate 17;

[0035] The outer shell 11 is detachably connected to the base plate 17. The main control board 12, the door opening detection mechanism 13, the door closing detection mechanism 14, and the positioning and release mechanism 15 are fixed on the base plate 17. The main control board 12 is electrically connected to the door opening detection mechanism 13 and the door closing detection mechanism 14 respectively. The positioning and release mechanism 15 is provided with a locking part 159.

[0036] The connecting rod bushing assembly 16 is perpendicularly arranged and rotatably connected to the base plate 17. The connecting rod bushing assembly 16 includes a bushing module 162 and a door opening / closing position detection module 163. An annular boss 1621 is fixed at one end of the bushing module 162 near the base plate (17).

[0037] The door opening / closing detection module 163 includes a first locking rod 1631, a second locking rod 1632, a door closing detection plate 1633, and a door opening detection plate 1634. The first locking rod 1631 is provided with a first locking part 16311.

[0038] The door closing detection plate 1633 and the door opening detection plate 1634 are sequentially sleeved on the outer peripheral wall of the bushing module 162. The door closing detection plate 1633 is located on the side of the door opening detection plate 1634 away from the annular boss 1621. The first locking rod 1631 is threadedly connected to the inner peripheral wall of the bushing module 162. The first locking part 16311 is located on the side of the door closing detection plate 1633 away from the door opening detection plate 1634. When the first locking rod 1631 is rotated clockwise, the first locking part 16311 moves towards the annular boss 1621. When the first locking part 16311 moves to the predetermined position, the first locking rod 1631 presses the door closing detection plate 1633 and the door opening detection plate 1634 against the annular boss 1621.

[0039] The door closing detection plate 1633 is fixed with a door closing detection protrusion 16331 and a first through hole (not shown). The second locking rod 1632 is threadedly connected to the first through hole (not shown). When the second locking rod 1632 is rotated clockwise to the predetermined position, the second locking rod 1632 passes through the first through hole (not shown) and abuts against the outer peripheral wall of the bushing module 162. The second locking rod 1632 locks the door closing detection plate 1633 onto the bushing module 162.

[0040] The door opening detection plate 1634 is fixed with a door opening detection protrusion 16341 and a groove 16342 that cooperates with the locking part 159;

[0041] One end of the first connecting rod 3 is fixedly connected to the bushing module 162, 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 module 2. The main body 1 is installed on or near the fire door frame, and the hydraulic module 2 is installed on the fire door body. Alternatively, the main body 1 is installed on the fire door body, and the hydraulic module 2 is installed on or near the fire door frame.

[0042] When installing the door closer, depending on the different needs of different scenarios, the door closing detection protrusion 16331 and the door opening detection protrusion 16341 need to be adjusted to different positions to match the opening angle and closing position of the fire door. A first locking rod 1631 and a second locking rod 1632 are provided. The door closing detection plate 1633 and the door opening detection plate 1634 can be locked or unlocked on the bushing module 162 by rotating the first locking rod 1631 and the second locking rod 1632 clockwise or counterclockwise. After unlocking, the installer can rotate the door closing detection plate 1633 and the door opening detection plate 1634 in the circumferential direction of the bushing module 162 as needed, easily adjusting the door closing detection protrusion 16331 and the door opening detection protrusion 16341 to different positions. After adjusting to the accurate position, the installer can then lock them by rotating the first locking rod 1631 and the second locking rod 1632 clockwise, thus easily completing the debugging and installation of the door closer.

[0043] After the fire door is debugged and installed, when the fire door is closed, the door body drives the second connecting rod 4 and the first connecting rod 3 to move. The first connecting rod 3 drives the bushing module 162 to rotate, and the bushing module 162 drives the door closing detection plate 1633 to rotate, thereby driving the door closing detection protrusion 16331 to move. When the fire door is closed, the door closing detection protrusion 16331 moves to the predetermined position A. After the door closing detection mechanism 14 detects that the door closing detection protrusion 16331 has moved to the predetermined position A, the circuit break state of the door closing detection mechanism 14 changes. The external monitoring center determines whether the fire door is closed properly by monitoring the circuit break state of the door closing detection mechanism 14. When the fire door is opened, the door body drives the hydraulic module 2, the second connecting rod 4 and the first connecting rod 3 to move. The first connecting rod 3 drives the bushing module 1632 to rotate. When block 162 rotates, the bushing module 162 drives the door opening detection plate 1634 to rotate, thereby causing the door opening detection protrusion 16341 to move. When the fire door is fully open, the door opening detection protrusion 16341 moves to the predetermined position B. After the door opening detection mechanism 13 detects that the door opening detection protrusion 16341 has moved to the predetermined position B, the circuit break state of the door opening detection mechanism 13 changes. The external monitoring center determines whether the fire door is fully open by monitoring the circuit break state of the door opening detection mechanism 13. In this way, the door opening and closing positions can be detected by only detecting the movement position of the door closer linkage, which can effectively monitor the opening and closing status of the fire door and avoid safety hazards. Moreover, the number of components of this utility model is greatly reduced, reducing production costs, and installation and debugging are also very simple.

[0044] Specifically, refer to Figure 2The bushing module 162 includes a bushing base 1622, an annular pressure plate 1623, and a locking sleeve 1624. The bushing base 1622 includes a bushing rod 16221 and an annular boss 1621. A first locking rod 1631 is threadedly connected to the inner circumferential wall of the bushing rod 16221. A door opening detection plate 1634 is sleeved on the outer circumferential wall of the bushing rod 16221. The annular pressure plate 1623 is sleeved on the outer circumferential wall of the bushing rod 16221, and the annular pressure plate 1623 is located on the side of the door opening detection plate 1634 away from the annular boss 1621. A door closing detection plate 1633 is sleeved on the annular pressure plate 16221. The door closing detection plate 1633 is located on the side of the annular pressure plate (1623) that is far away from the door closing detection plate 1634. The locking sleeve 1624 is sleeved on the first locking rod 1631 and is located between the first locking part 16311 and the door closing detection plate 1633. This arrangement makes the distance between the door closing detection plate 1633 and the door opening detection plate 1634 larger, which is more conducive to the door closing detection mechanism 14 and the door opening detection mechanism 13 respectively detecting the movement position of the door closing detection plate 1633 and the door opening detection plate 1634 without interfering with each other and causing misjudgment.

[0045] Specifically, refer to Figure 3 , 4 The locking part 159 is a sphere 156. The positioning and release mechanism 15 also includes a limiting seat 151, a limiting rod 152, a control rod 153, a spring 154, a top block 155, a spring sleeve 157, and a limiting sleeve 158. The limiting seat 151 is fixed on the base plate 17. The limiting seat 151 is provided with a first limiting groove 1511, a second limiting groove 1512, and a limiting shaft 1513. The limiting rod 152 is provided with a first limiting part 1521. The control rod 153 includes a first end 1531 and a second end 1532. The first end 1531 is provided with a second limiting part 153 that cooperates with the first limiting part 1521. 11. The control rod 153 is slidably disposed in the first limiting groove 1511 and the second end 1532 of the control rod 153 protrudes outside the first limiting groove 1511. The limiting rod 152 is rotatably connected to the limiting shaft 1513. The first limiting part 1521 is located in the second limiting groove 1512. When the limiting rod 152 rotates circumferentially along the limiting shaft 1513, the first limiting part 1521 on the limiting rod 152 slides in the second limiting groove 1512. When the first limiting part 1521 slides to the predetermined position C, the first limiting part 1521 and the second limiting part 15311 engage to limit the control rod 153.

[0046] The limiting sleeve 158 has a cavity 1581, a first opening 1582, and a second opening 1583. A spring sleeve 157 is fixedly disposed within the cavity 1581. The second end 1532 of the control rod 153 is fixedly connected to the limiting sleeve 158, or the second end 1532 extends into the limiting sleeve 158 through the first opening 1582 and abuts against the spring sleeve 157. A spring 154 is disposed within the spring sleeve 157. One end of the spring 154 abuts against the inner end wall of the spring sleeve 157 near the end of the control rod 153, and the other end of the spring 154 abuts against the top block 155. A portion of 5 is located inside the spring sleeve 157 or the top block 155 is entirely located inside the spring sleeve 157. A slider 1551 is fixed on the top block 155. A groove 1571 is opened on the outer peripheral wall of the spring sleeve 157. The slider 1551 slides in the groove 1571. The sphere 156 is located in the cavity 1581 and the sphere 156 is located on the side of the top block 155 away from the spring 154. The height of the second opening 1583 is less than the diameter of the sphere 156. The height of the second opening 1583 is greater than the thickness of the groove 16342 of the door opening detection plate 1634.

[0047] With this configuration, the limiting seat 151 and the limiting rod 152 can lock and release the locking part 159 and the groove 16342 by limiting or releasing the control rod 153, thereby locking and unlocking the first link 3. When the fire door is fully opened, the limiting rod 152 is moved to lock the locking part 159 and the groove 16342, thus locking the first link 3 and locking the fire door in the open position. When the fire door needs to be closed, the limiting rod 152 is moved to release the locking part 159 from the groove 16342, thereby unlocking the first link 3, and the door can be closed under the hydraulic pressure of the hydraulic module. The spring sleeve 157 can pre-compress the spring 154. When the ball 156 is locked with the groove 16342, the spring 154 can provide sufficient elastic force to press the ball 156 against the groove through the top block 155, making the locking of the ball 156 and the groove 16342 more stable.

[0048] Specifically, refer to Figure 4 The second end 1532 of the control lever 153 is also provided with a third limiting part 15321. When the control lever 153 moves to a certain position in the direction of approaching the limiting seat 151, the third limiting part 15321 abuts against the limiting seat 151. This can prevent the limiting rod 152 from entering the limiting seat 151 too much when the limiting seat 151 and the limiting rod 152 unlock the control lever 153, making it difficult to reset.

[0049] Specifically, refer to Figure 5The door opening detection mechanism 13 is a first micro switch 131, which has a first spring 1311 on it. The first spring 1311 is located on the side of the first micro switch 131 near the door opening detection plate 1634. The door closing detection mechanism 14 is a second micro switch 141, which has a second spring 1411 on it. The second spring 1411 is located on the side of the second micro switch 141 near the door closing detection plate 1633. When the fire door is fully open, the first spring 1311 abuts against the door opening detection protrusion 16341. When the fire door is fully closed, the second spring 1411 abuts against the door closing detection protrusion 16331. This configuration can accurately detect the positions of the door opening detection protrusion 16341 and the door closing detection protrusion 16331, thereby detecting whether the fire door is fully open or closed.

[0050] Specifically, the door opening detection plate 1634 has a first meshing structure 16343 on the side surface near the annular boss 1621, and the annular boss 1621 has a second meshing structure 16211 on the side surface near the door opening detection plate 1634 that cooperates with the first meshing structure 16343. This arrangement can make the locking state of the door opening detection plate 1634 and the bushing module 162 more stable, and also facilitates more precise adjustment of the relative angular displacement of the door opening detection plate 1634 and the bushing module 162.

[0051] Specifically, the inner peripheral wall of the door opening detection plate 1634 is provided with a third meshing structure (not shown), and the outer peripheral wall of the bushing module 162 is provided with a fourth meshing structure (not shown) that cooperates with the third meshing structure (not shown).

[0052] Specifically, the housing 11 is provided with a wiring baffle (not shown), and the wiring baffle (not shown) has a wiring hole (not shown). The wiring baffle (not shown) is detachably connected to the housing 11. This arrangement facilitates the installation of wires of different thicknesses or the installation of protective tubes for wires at the wiring holes.

[0053] Preferably, the door opening detection mechanism 13 and the door closing detection mechanism 14 are pressure sensors, angular displacement sensors, photoelectric sensors or magnetic induction sensors.

[0054] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A linkage-type door closer for monitoring the opening and closing status of fire doors, characterized in that: It includes a main body (1), a hydraulic module (2), a first connecting rod (3), and a second connecting rod (4); The main body (1) includes a shell (11), a main control board (12), a door opening detection mechanism (13), a door closing detection mechanism (14), a positioning and release mechanism (15), a connecting rod bushing assembly (16), and a base plate (17); The outer shell (11) is detachably connected to the base plate (17). The main control board (12), the door opening detection mechanism (13), the door closing detection mechanism (14), and the positioning and release mechanism (15) are fixed on the base plate (17). The main control board (12) is electrically connected to the door opening detection mechanism (13) and the door closing detection mechanism (14) respectively. The positioning and release mechanism (15) is provided with a locking part (159). The connecting rod bushing assembly (16) is perpendicularly arranged and rotatably connected to the base plate (17). The connecting rod bushing assembly (16) includes a bushing module (162) and a door opening / closing position detection module (163). An annular boss (1621) is fixedly provided at one end of the bushing module (162) near the base plate (17). The door opening / closing detection module (163) includes a first locking rod (1631), a second locking rod (1632), a door closing detection plate (1633), and a door opening detection plate (1634). The first locking rod (1631) is provided with a first locking part (16311). The door closing detection plate (1633) and the door opening detection plate (1634) are sequentially sleeved on the outer peripheral wall of the bushing module (162). The door closing detection plate (1633) is located on the side of the door opening detection plate (1634) away from the annular boss (1621). The first locking rod (1631) is threadedly connected to the inner peripheral wall of the bushing module (162). The first locking part (16311) is located on the door closing detection plate (1633) (1634) (1633). 33) On the side away from the door opening detection plate (1634), when the first locking rod (1631) is rotated clockwise, the first locking part (16311) moves toward the annular boss (1621). When the first locking part (16311) moves to the predetermined position, the first locking rod (1631) presses the door closing detection plate (1633) and the door opening detection plate (1634) against the annular boss (1621). The door closing detection plate (1633) is fixed with a door closing detection protrusion (16331) and a first through hole. The second locking rod (1632) is threadedly connected to the first through hole. When the second locking rod (1632) is rotated clockwise to a predetermined position, the second locking rod (1632) passes through the first through hole and abuts against the outer peripheral wall of the bushing module (162). The second locking rod (1632) locks the door closing detection plate (1633) on the bushing module (162). The door opening detection plate (1634) is fixedly provided with a door opening detection protrusion (16341) and a groove (16342) that cooperates with the locking part (159); One end of the first connecting rod (3) is fixedly connected to the bushing module (162), and the other end of the first connecting rod (3) is rotatably connected to one end of the second connecting rod (4). The end of the second connecting rod (4) away from the first connecting rod (3) is rotatably connected to the hydraulic module (2). The main body (1) is installed on or near the fire door frame, and the hydraulic module (2) is installed on the fire door body. Alternatively, the main body (1) is installed on the fire door body, and the hydraulic module (2) is installed on or near the fire door frame.

2. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 1, wherein The bushing module (162) includes a bushing base (1622), an annular pressure plate (1623), and a locking sleeve (1624). The bushing base (1622) includes a bushing rod (16221) and the annular boss (1621). The first locking rod (1631) is threadedly connected to the inner peripheral wall of the bushing rod (16221). The door opening detection plate (1634) is sleeved on the outer peripheral wall of the bushing rod (16221), and the annular pressure plate (1623) is sleeved on the outer peripheral wall of the bushing rod (16221). The annular pressure plate (1623) is located on the side of the door opening detection plate (1634) away from the annular boss (1621). The door closing detection plate (1633) is sleeved on the annular pressure plate (1623) and is located on the side of the annular pressure plate (1623) away from the door opening detection plate (1634). The locking sleeve (1624) is sleeved on the first locking rod (1631) and is located between the first locking part (16311) and the door closing detection plate (1633).

3. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 1, wherein The locking part (159) is a sphere (156), and the positioning and release mechanism (15) also includes a limiting seat (151), a limiting rod (152), a control rod (153), a spring (154), a top block (155), a spring sleeve (157), and a limiting sleeve (158). The limiting seat (151) is fixed on the base plate (17). The limiting seat (151) is provided with a first limiting groove (1511), a second limiting groove (1512), and a limiting shaft (1513). The limiting rod (152) is provided with a first limiting part (1521). The control rod (153) includes a first end (1531) and a second end (1532). The first end (1531) is provided with a second limiting part (15311) that cooperates with the first limiting part (1521). The control rod (153) slides in the first limiting groove (1511), and the second end (1531) of the control rod (153) is... 2) Exposed outside the first limiting groove (1511), the limiting rod (152) is rotatably connected to the limiting shaft (1513), the first limiting part (1521) is located in the second limiting groove (1512), when the limiting rod (152) rotates circumferentially along the limiting shaft (1513), the first limiting part (1521) on the limiting rod (152) slides in the second limiting groove (1512), when the first limiting part (1521) slides to a predetermined position, the first limiting part (1521) and the second limiting part (15311) engage to limit the control rod (153); The limiting sleeve (158) is provided with a cavity (1581), a first opening (1582), and a second opening (1583). The spring sleeve (157) is fixedly disposed in the cavity (1581). The second end (1532) of the control rod (153) is fixedly connected to the limiting sleeve (158), or the second end (1532) of the control rod (153) extends into the limiting sleeve (158) through the first opening (1582) and abuts against the spring sleeve (157). The spring (154) is disposed in the spring sleeve (157). One end of the spring (154) abuts against the inner end wall of the spring sleeve (157) near the end of the control rod (153), and the other end of the spring (154) abuts against the top block (155). A portion of the top block (155) is located inside the spring sleeve (157), or the entire top block (155) is located inside the spring sleeve (157). A slider (1551) is fixed on the top block (155). A groove (1571) is formed on the outer peripheral wall of the spring sleeve (157). The slider (1551) slides in the groove (1571). The sphere (156) is located in the cavity (1581) and is located on the side of the top block (155) away from the spring (154). The height of the second opening (1583) is less than the diameter of the sphere (156). The height of the second opening (1583) is greater than the thickness of the groove (16342) of the door opening detection plate (1634).

4. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 3, wherein The second end (1532) of the control lever (153) is also provided with a third limiting part (15321). When the control lever (153) moves to a certain position in the direction of approaching the limiting seat (151), the third limiting part (15321) abuts against the limiting seat (151).

5. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 1, wherein The door opening detection mechanism (13) is a first micro switch (131), which has a first spring (1311) on it. The first spring (1311) is located on the side of the first micro switch (131) near the door opening detection plate (1634). The door closing detection mechanism (14) is a second micro switch (141), which has a second spring (1411) on it. The second spring (1411) is located on the side of the second micro switch (141) near the door closing detection plate (1633). When the fire door is fully open, the first spring (1311) abuts against the door opening detection protrusion (16341). When the fire door is fully closed, the second spring (1411) abuts against the door closing detection protrusion (16331).

6. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 1, wherein The door opening detection plate (1634) has a first tooth structure (16343) on one side surface near the annular boss (1621), and the annular boss (1621) has a second tooth structure (16211) on one side surface near the door opening detection plate (1634) that cooperates with the first tooth structure (16343).

7. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 1, wherein The inner peripheral wall of the door opening detection plate (1634) is provided with a third meshing structure, and the outer peripheral wall of the bushing module (162) is provided with a fourth meshing structure that cooperates with the third meshing structure.

8. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 1, wherein The outer casing (11) is provided with a wiring baffle, and the wiring baffle is provided with a wiring hole. The wiring baffle is detachably connected to the outer casing (11).

9. The link-type door closer for monitoring the opening and closing state of a fireproof door according to claim 1, wherein The door opening detection mechanism (13) and the door closing detection mechanism (14) are pressure sensors, angular displacement sensors, photoelectric sensors or magnetic induction sensors.

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