阅读说明：本技术 一种防火门闭门器及防火门 (Prevent fire door closer and prevent fire door ) 是由 白绪涛 方华松 孙宝承 张晓晨 李银凡 李文杰 于 2021-07-15 设计创作，主要内容包括：本发明公开了一种防火门闭门器及防火门,包括壳体、滑块和锁止装置,所述锁止装置包括限位组件、动力组件及弹性件,所述限位组件包括锁止舌及用于带动所述锁止舌移动的曲柄机构,所述锁止舌移动的方向与所述滑块滑动方向相交；所述曲柄机构包括连接杆以及与所述连接杆转动连接的第一转杆和第二转杆,所述第一转杆的一端与所述锁止舌转动连接,所述第一转杆的另一端与所述连接杆转动连接；所述第二转杆的一端与所述连接杆转动连接,所述第二转杆的另一端与所述壳体转动连接。本发明的防火门闭门器,节能、可靠,可应用于较大力矩的防火门,人工在紧急情况下能够省力快速地强制关门；弹性件能够缓冲对闭门器的撞击力,增加闭门器的耐用性和安全性。(The invention discloses a fireproof door closer and a fireproof door, which comprise a shell, a sliding block and a locking device, wherein the locking device comprises a limiting assembly, a power assembly and an elastic piece, the limiting assembly comprises a locking tongue and a crank mechanism for driving the locking tongue to move, and the moving direction of the locking tongue is intersected with the sliding direction of the sliding block; the crank mechanism comprises a connecting rod, a first rotating rod and a second rotating rod which are rotatably connected with the connecting rod, one end of the first rotating rod is rotatably connected with the locking tongue, and the other end of the first rotating rod is rotatably connected with the connecting rod; one end of the second rotating rod is rotatably connected with the connecting rod, and the other end of the second rotating rod is rotatably connected with the shell. The fireproof door closer disclosed by the invention is energy-saving and reliable, can be applied to a fireproof door with larger moment, and can be manually and rapidly forced to close the door in an emergency; the elastic piece can buffer the impact force to the door closer, and the durability and the safety of the door closer are improved.)

1. A fireproof door closer is characterized by comprising a shell, a sliding block arranged on the shell in a sliding mode and a locking device arranged inside the shell, wherein the locking device comprises a limiting assembly, a power assembly and an elastic piece arranged between the limiting assembly and the power assembly; the crank mechanism comprises a connecting rod, a first rotating rod and a second rotating rod, wherein the first rotating rod and the second rotating rod are rotatably connected with one end, close to the locking tongue, of the connecting rod; one end of the second rotating rod is rotatably connected with the connecting rod, the other end of the second rotating rod is rotatably connected with the shell, the power assembly is used for driving the connecting rod to move so as to drive the locking tongue to be located on a sliding path of the sliding block or retract from the sliding path of the sliding block, and the elastic piece is used for providing a trend for enabling the connecting rod to be far away from the power assembly.

2. The fire door closer of claim 1, wherein a rotational axis between the connecting bar and the first turn bar coincides with a rotational axis between the connecting bar and the second turn bar.

3. The fire door closer of claim 1, wherein the power assembly comprises a pull rod and a driving mechanism for driving the pull rod to move, one end of the pull rod is rotatably connected to one end of the connecting rod away from the locking tongue, and the elastic member is sleeved on the pull rod.

4. The fire door closer of claim 3, wherein a pin is disposed at an end of the connecting rod away from the locking tongue, and the pin is disposed perpendicular to a length direction of the connecting rod; one end of the pull rod, which is close to the connecting rod, is provided with a waist circular hole which penetrates through the thickness direction of the pull rod, the extending direction of the waist circular hole is the same as that of the pull rod, and the pin shaft penetrates through the waist circular hole.

5. The fire door closer of claim 4, wherein a fixing plate is disposed at an end of the pull rod away from the connecting rod, the fixing plate is connected to the driving mechanism, one end of the elastic member acts on the fixing plate, and the other end of the elastic member acts on the pin.

6. The fire door closer of claim 5, wherein the driving mechanism comprises a motor and an output rod, one end of the output rod is rotatably connected to an output shaft of the motor, the other end of the output rod is rotatably connected to the fixing plate, and the motor is configured to drive the output rod to rotate so as to drive the pull rod to move.

7. The fire door closer of claim 4, wherein a first blocking plate and a second blocking plate are respectively disposed on two sides of the locking tongue, the first blocking plate is close to the power assembly and located between the pin shaft and the locking tongue, the second blocking plate is far away from the power assembly, and the first rotating rod and the second rotating rod are located between the first blocking plate and the second blocking plate; the first baffle is provided with a notch, the connecting rod penetrates through the notch, the second baffle is provided with a through hole, the through hole is provided with an adjusting rod in a penetrating mode, and the adjusting rod is used for adjusting the distance between the connecting rod and the second baffle when the locking tongue is located on the sliding path of the sliding block.

8. The fire door closer of claim 1, wherein the locking tongue includes a first inclined surface and a second inclined surface for contacting the slider, the first inclined surface is away from the power assembly, the second inclined surface is close to the power assembly, a slope of the first inclined surface is less than a slope of the second inclined surface, a bottom of the slider is provided with a third inclined surface and a fourth inclined surface corresponding to the first inclined surface and the second inclined surface respectively, the fourth inclined surface is close to the second inclined surface when the fire door is in the open state, and the third inclined surface is close to the first inclined surface when the fire door is in the closed state.

9. The fire door closer of claim 1, wherein the housing comprises a bottom plate and side plates disposed at two sides of the bottom plate, the two side plates are perpendicular to the bottom plate, a first protruding block and a second protruding block are disposed on a side of the two side plates close to each other, the first protruding block and the second protruding block are perpendicular to the side plates, the first protruding block is disposed at a side of the side plates away from the bottom plate, the second protruding block is disposed between the first protruding block and the bottom plate, a sliding groove for the sliding of the sliding block is formed between the two first protruding blocks, the two second protruding blocks and the two side plates, and the locking tongue is disposed in the sliding groove when the fire door is in the open and/or closed state; and a cavity for accommodating the locking device is formed among the bottom plate, the two second convex blocks and the two side plates.

10. A fire door comprising the fire door closer of any one of claims 1-9.

Technical Field

The invention belongs to the technical field of fire safety, and particularly relates to a fireproof door closer and a fireproof door comprising the same.

Background

The fireproof door can effectively prevent fire from spreading and smoke from diffusing in time when a fire disaster happens, and ensures that people are evacuated in time to avoid being damaged by the fire disaster. The fire-proof door is divided into a normally closed fire-proof door and a normally open fire-proof door, the common normally closed fire-proof door can be blocked in time when a fire occurs, but the normal close of the fire-proof door is not beneficial to ventilation under normal conditions, and people need to repeatedly open and close the door when entering and exiting, so that the service life of the fire-proof door can be shortened for a long time; the normally-open fireproof door can be kept in an open state under normal conditions, ventilation is facilitated, people can conveniently enter and exit the normally-open fireproof door, and the normally-open fireproof door can be closed in time through the door closer when fire occurs.

The existing common door closer usually adopts the principle of electromagnet attraction and release to control the opening and closing of the fireproof door. The method is divided into two schemes: the first type is an electrified keeping type, when the fireproof door is opened, the electromagnet is always kept at rated power for supplying power, after the power is cut off, the door closer is released, and the fireproof door is closed; the second type is mechanical locking type, when preventing fire door and opening, makes electric door closer be in the open mode through the hasp locking, striking formula electro-magnet does not supply power this moment, and when needs fire door closed, the electro-magnet power supply strikes the hasp through the electro-magnet hammer striking, breaks off the locking, realizes preventing fire door's closing. There are two common disadvantages to the two door closer constructions described above: firstly, when the door is closed manually, a release button on the door closer needs to be pressed first, and then the door is pushed manually, so that the door is not closed easily in emergency situations or people with short stature can close the door; secondly, the door closer structure is unstable, and the door closer structure is easily damaged by pushing the door with great force, and the service life of the door closer is shortened.

Disclosure of Invention

In view of the above, in order to overcome the defects of the prior art, the present invention provides a fire door closer, which is used for solving the problem that the door closer in the prior art cannot be manually closed quickly and conveniently in an emergency and is damaged by pushing the fire door strongly.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a fireproof door closer, which comprises a shell, a sliding block arranged on the shell in a sliding manner, and a locking device arranged in the shell, wherein the locking device comprises a limiting assembly, a power assembly and an elastic piece arranged between the limiting assembly and the power assembly; the crank mechanism comprises a connecting rod, a first rotating rod and a second rotating rod, wherein the first rotating rod and the second rotating rod are rotatably connected with one end, close to the locking tongue, of the connecting rod; one end of the second rotating rod is rotatably connected with the connecting rod, the other end of the second rotating rod is rotatably connected with the shell, the power assembly is used for driving the connecting rod to move so as to drive the locking tongue to be located on a sliding path of the sliding block or retract from the sliding path of the sliding block, and the elastic piece is used for providing a trend for enabling the connecting rod to be far away from the power assembly. A first rotating shaft is arranged between one end of the first rotating rod and the locking tongue, and the first rotating rod can rotate around the first rotating shaft and simultaneously drive the locking tongue to move up and down; a second rotating shaft is arranged between the other end of the second rotating rod and the shell, the second rotating shaft is fixedly connected with the shell, and the second rotating rod can rotate around the second rotating shaft.

The locking and releasing of the door closer are realized by matching the power assembly and the elastic piece with the crank mechanism, and the fire door is quickly and directly closed manually in an emergency without spending large force by utilizing the movement and stress mechanism of the crank mechanism; the buffering effect of the elastic piece can effectively avoid damaging the door closer when a door is closed pneumatically by using large force or after the door is opened and closed frequently.

According to some preferred embodiments of the invention, the axis of rotation between the connecting rod and the first rotating bar coincides with the axis of rotation between the connecting rod and the second rotating bar. Be provided with the third pivot between first bull stick, second bull stick and the connecting rod, connect the three jointly through the third pivot for the removal of connecting rod can drive first bull stick and second bull stick and rotate around the third pivot simultaneously, reaches the locking purpose. The length of the second rotating shaft is greater than that of the first rotating shaft and that of the third rotating shaft, so that the second rotating shaft and the shell are conveniently fixed, the movement of the whole crank mechanism is limited through the second rotating shaft when the connecting rod moves, and the aim of driving the locking tongue to move up and down is finally achieved; on the other hand, each part of the crank mechanism is connected with each other, and the fixation of the second rotating shaft and the shell is also favorable for the stability of the whole crank mechanism, so that the crank mechanism cannot shake randomly in the movement process and can rotate around respective axes better.

According to some preferred implementation aspects of the invention, the power assembly comprises a pull rod and a driving mechanism for driving the pull rod to move, one end of the pull rod is rotatably connected with one end of the connecting rod away from the locking tongue, and the elastic member is sleeved on the pull rod. Drive mechanism links to each other with the connecting rod through the pull rod for can drive the pull rod after drive mechanism starts and remove, thereby drive the connecting rod and remove, drive the locking tongue through crank mechanism and reciprocate, make the slider cross the locking tongue or be kept out by the locking tongue, realize preventing the switch of fire door.

According to some preferred implementation aspects of the invention, a pin shaft is arranged at one end of the connecting rod, which is far away from the locking tongue, and the pin shaft is arranged perpendicular to the length direction of the connecting rod; one end of the pull rod, which is close to the connecting rod, is provided with a waist circular hole which penetrates through the thickness direction of the pull rod, the extending direction of the waist circular hole is the same as that of the pull rod, and the pin shaft penetrates through the waist circular hole. The pin shaft penetrates through the end part of the connecting rod and the waist round hole to connect the connecting rod with the pull rod, so that the limiting effect can be achieved, and the connecting rod and the pull rod are prevented from sliding off; and the pin shaft slides in the waist round hole to generate displacement, so that the elastic part is compressed, and the aim of buffering is fulfilled.

According to some preferred implementation aspects of the invention, a fixing plate is arranged at one end of the pull rod, which is far away from the connecting rod, the fixing plate is connected with the driving mechanism, one end of the elastic element acts on the fixing plate, and the other end of the elastic element acts on the pin shaft. The elastic part is positioned between the fixed plate and the pin shaft, and the length of the pin shaft and the size of the fixed plate are both larger than the diameter of the elastic part, so that the elastic part can only be compressed and released between the fixed plate and the pin shaft; when the fireproof door is in a fully opened and closed state, namely the locking tongue is positioned on the sliding path of the sliding block, the elastic piece is compressed, and the generated elastic restoring force in the horizontal direction can prevent the first rotating rod and the second rotating rod in the crank mechanism from being bent, so that the fireproof door can be kept in an opened or closed state without other external force. In addition, the elastic piece can play a role in buffering, so that the door closer cannot be damaged when the door is pushed by manpower. In some embodiments of the present invention, the elastic member is preferably a spring, and the natural length of the spring is greater than the distance between the fixing plate and the pin.

According to some preferred implementation aspects of the invention, the driving mechanism comprises a motor and an output rod, one end of the output rod is rotatably connected with an output shaft of the motor, the other end of the output rod is rotatably connected with the fixed plate, and the motor is used for driving the output rod to rotate so as to drive the pull rod to move. The motor shell is provided with a baffle for fixing the motor, a shaft sleeve is arranged between the motor and the output rod, and the shaft sleeve is connected to an output shaft of the motor. The motor is connected with the pull rod through the output rod, the pull rod is driven to move by the driving of the motor, and then the crank mechanism is driven to operate, and the locking tongue moves up and down. In some embodiments of the invention, the motor is preferably a speed reducing motor, and the speed reducing motor has the characteristics of low rotating speed and large torque, so that the energy consumption is low, the durability is high, and the door closer can bear high overload capacity, so that the door closer can be applied to a fireproof door with large torque to achieve the effect of better blocking fire; the power supply of the speed reducing motor can directly use the built-in nickel-hydrogen battery pack in the electric door closer without additionally configuring a power supply; the nickel-hydrogen battery pack can be charged through a bus of the electric door closer, and has the advantage of energy conservation.

According to some preferred implementation aspects of the present invention, a first baffle and a second baffle are respectively disposed on two sides of the locking tongue, the first baffle is close to the power assembly and located between the pin shaft and the locking tongue, the second baffle is far away from the power assembly, and the first rotating rod and the second rotating rod are located between the first baffle and the second baffle; the first baffle is provided with a notch, the connecting rod penetrates through the notch, the second baffle is provided with a through hole, the through hole is provided with an adjusting rod in a penetrating mode, and the adjusting rod is used for adjusting the distance between the connecting rod and the second baffle when the locking tongue is located on the sliding path of the sliding block. The first and second shutters make the locking tongue not move in the horizontal direction but move only up and down in the vertical direction. The width of breach slightly is greater than the thickness of connecting rod, and the length of breach is greater than the width of connecting rod, avoids the size of breach to cause the restriction to the motion of connecting rod for the connecting rod not only can be located the horizontal slip at the breach, can also rotate about in order to realize reciprocating of locking tongue in breach department. The distance between the connecting rod and the second baffle can be adjusted by adjusting the adjusting rod, the stopping resistance of the crank mechanism can be further adjusted by adjusting the distance between the connecting rod and the second baffle, and the optimal distance can be adjusted according to the actual condition in the using process.

According to some preferred implementation aspects of the invention, the locking tongue comprises a first inclined surface and a second inclined surface for contacting with the slider, the first inclined surface is far away from the power assembly, the second inclined surface is close to the power assembly, the gradient of the first inclined surface is smaller than that of the second inclined surface, the bottom of the slider is provided with a third inclined surface and a fourth inclined surface corresponding to the first inclined surface and the second inclined surface respectively, the fourth inclined surface is close to the second inclined surface when the fire door is in an open state, and the third inclined surface is close to the first inclined surface when the fire door is in a closed state. The setting of the first inclined plane and the second inclined plane of different slopes is corresponding to the size of the required external force when opening the door or closing the door: after the fireproof door is closed, the sliding block is positioned on the side with smaller gradient, namely the third inclined surface of the sliding block is contacted with the first inclined surface of the locking tongue, so that the crank mechanism can be subjected to larger vertical pressure in the vertical direction only by applying small acting force manually, and the sliding block can easily pass over the locking tongue to open the fireproof door; after the fireproof door is completely opened, the sliding block is positioned on the surface with the larger gradient, namely the fourth inclined surface of the sliding block is contacted with the second inclined surface of the locking tongue, and the corresponding resistance is also larger, so that the elastic force of the door closer is not enough to push the sliding block to cross the locking tongue, and the fireproof door can be stably kept in an opening state.

According to some preferred implementation aspects of the present invention, the casing includes a bottom plate and side plates disposed on two sides of the bottom plate, two of the side plates are perpendicular to the bottom plate, a first protruding block and a second protruding block are disposed on a side of each of the two side plates close to each other, the first protruding block and the second protruding block are perpendicular to the side plates, the first protruding block is located on a side of the side plate away from the bottom plate, the second protruding block is located between the first protruding block and the bottom plate, sliding grooves for the sliding of the sliding blocks are formed between the two first protruding blocks, the two second protruding blocks and the two side plates, and the locking tongues are located in the sliding grooves when the fire door is in an open and/or closed state; and a cavity for accommodating the locking device is formed among the bottom plate, the two second convex blocks and the two side plates. The shell provides a protection effect for the whole locking device, and the locking device is prevented from being damaged; a cover plate is arranged between the chute and the cavity, the upper part of the locking device can be fixedly connected with the cover plate, and the lower part of the locking device can be fixedly connected with the bottom plate, so that the whole locking device is fixed with the shell, the structure of the locking device is more stable, and the locking device cannot be influenced by the vibration of a motor; and the arrangement of the cover plate can also avoid the interference of the sliding block and the components of the locking device in the sliding process.

The invention also provides a fire door comprising the fire door closer.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the beneficial effects that: according to the fireproof door closer, the power assembly is matched with the crank mechanism, the structural characteristics of the crank mechanism are utilized, and the crank mechanism can bear larger vertical pressure in the Y-axis direction by applying small acting force in the X-axis direction, so that the fireproof door can be automatically closed when the door closer receives a door closing instruction, or the door can be manually and quickly closed forcibly in a labor-saving manner in an emergency; due to the arrangement of the elastic piece, even if the force used when the door is pushed is too large, the power assembly in the door closer cannot be damaged, and the durability and the reliability of the door closer are improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Figure 1 is a perspective view of the fire door closer of the preferred embodiment of the present invention after concealing the housing;

FIG. 2 is a side view of the fire door closer of the preferred embodiment of the present invention after concealing the housing;

figure 3 is a perspective view of the fire door closer in the preferred embodiment of the present invention;

figure 4 is a cross-sectional view of the fire door closer in the preferred embodiment of the present invention;

FIG. 5 is a perspective view of a stop assembly in accordance with a preferred embodiment of the present invention;

in the drawings: the device comprises a shell body-1, a bottom plate-11, a side plate-12, a first lug-121, a second lug-122, a sliding block-2, a third inclined surface-21, a fourth inclined surface-22, a locking device-3, a limiting component-31, a locking tongue-311, a crank mechanism-312, a connecting rod-313, a first rotating rod-314, a second rotating rod-315, a first inclined surface-316, a second inclined surface-317, a first baffle-318, a second baffle-319, a power component-32, a pull rod-321, a driving mechanism-322, a pin shaft-323, a kidney circular hole-324, a fixing plate-325, an elastic component-326, a motor-327, a shaft sleeve-328, an output rod-329, a notch-33, an adjusting rod-34 and a third baffle-35, a cover plate-36, a first rotating shaft-4, a second rotating shaft-5 and a third rotating shaft-6.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 5, the fire door of the present embodiment includes a door frame, a door leaf, a smoke sensor, a fire alarm mechanism, and other conventional components, and a door closer. The fire door closer of the embodiment comprises a shell 1, a sliding block 2 arranged on the shell 1 in a sliding mode, and a locking device 3 arranged inside the shell 1.

As shown in fig. 3 to 4, the housing 1 includes a bottom plate 11 and side plates 12 disposed at two sides of the bottom plate 11, the two side plates 12 are perpendicular to the bottom plate 11, a first protrusion 121 and a second protrusion 122 are disposed on the sides of the two side plates 12 close to each other, and the first protrusion 121 and the second protrusion 122 are perpendicular to the side plates 12; the first protrusion 121 is located on a side of the side plate 12 away from the bottom plate 11, and the second protrusion 122 is located between the first protrusion 121 and the bottom plate 11. A sliding groove is formed between the two first convex blocks 121, the two second convex blocks 122 and the two side plates 12, and the sliding block 2 slides in the sliding groove; a cavity is formed between the bottom plate 11, the two second protrusions 122 and the two side plates 12, and the locking device 3 is accommodated in the cavity. In addition, a cover plate 36 is further arranged at a part between the chute and the cavity, the top of the locking device 3 is fixedly connected with the cover plate 36, the bottom of the locking device 3 is fixedly connected with the bottom plate 11, the locking device 3 can be fixed with the shell 1, and the structure of the locking device 3 is more stable; and the cover plate 36 also prevents the slider 2 from interfering with the components of the locking device 3 during sliding.

As shown in fig. 1-2, the locking device 3 includes a position-limiting component 31, a power component 32, and an elastic component 326 disposed between the position-limiting component 31 and the power component 32.

As shown in fig. 3, the position limiting assembly 31 includes a locking tongue 311 and a crank mechanism 312 for driving the locking tongue 311 to move, and the crank mechanism 312 includes a connecting rod 313, a first rotating rod 314 and a second rotating rod 315. A pin shaft 323 is arranged at one end of the connecting rod 313 far away from the locking tongue 311, and the pin shaft 323 is arranged perpendicular to the length direction of the connecting rod 313; the other end of the connection rod 313 is rotatably connected to the first and second rotation levers 314 and 315. A first rotating shaft 4 is arranged between one end of the first rotating rod 314 and the locking tongue 311, so that the first rotating rod 314 can rotate around the first rotating shaft 4 and drive the locking tongue 311 to move up and down; a second rotating shaft 5 is arranged between one end of the second rotating rod 315 and the side plate 12, and the second rotating shaft 5 is fixed with the housing 1, so that the second rotating rod 315 can rotate around the second rotating shaft 5. A third rotating shaft 6 is arranged between the other end of the first rotating rod 314, the other end of the second rotating rod 315 and the connecting rod 313, and the first rotating rod 314, the second rotating rod 315 and the connecting rod 313 are rotatably connected through the third rotating shaft 6, so that the first rotating rod 314 and the second rotating rod 315 can be driven to rotate around the third rotating shaft 6 simultaneously by the movement of the connecting rod 313, and then the locking tongue is driven to move up and down, and the purpose of locking is achieved. In the present embodiment, the length of the second rotating shaft 5 is greater than the length of the first rotating shaft 4 and the third rotating shaft 6. When the connecting rod 313 moves, the movement of the whole crank mechanism 312 is limited through the second rotating shaft 5, and finally the purpose of driving the locking tongue 311 to move up and down is achieved; on the other hand, the components of the crank mechanism 312 are connected to each other, and the fixation of the second rotating shaft 5 and the housing 1 is also beneficial to the stability of the whole crank mechanism 312, so that the crank mechanism does not shake randomly in the movement process, and can rotate around the respective axes better.

The moving direction of the locking tongue 311 is vertical to the sliding direction of the slider 2, a first inclined surface 316 far away from the power assembly 32 and a second inclined surface 317 close to the power assembly 32 are arranged on the locking tongue 311, and the gradient of the first inclined surface 316 is smaller than that of the second inclined surface 317; the bottom of the slider 2 is provided with a third inclined surface 21 and a fourth inclined surface 22 corresponding to the first inclined surface 316 and the second inclined surface 317. When the fireproof door is in a completely closed state and an completely opened state, the locking tongue 311 is located in the sliding groove, the first inclined surface 316 has a small gradient, the third inclined surface 21 of the slider 2 is in contact with the first inclined surface 316 after the fireproof door is closed, so that the crank mechanism 312 can bear large vertical pressure in the vertical direction only by applying small acting force manually, the locking tongue 311 moves downwards, the slider 2 can easily cross the locking tongue 311, the fireproof door is opened, the fourth inclined surface 22 is in contact with the second inclined surface 317 at the moment, the resistance is also larger because the gradient of the second inclined surface 317 is large, the elastic force of the door closer is not enough to push the slider 2 to cross the locking tongue 311, and the fireproof door can stably keep the opened state.

A first baffle 318 close to the power assembly 32 and a second baffle 319 far away from the power assembly 32 are respectively arranged on two sides of the locking tongue 311, and the first baffle 318 is positioned between the pin 323 and the locking tongue 311. The first and second shutters 318 and 319 cause the locking tongue 311 not to move in the horizontal direction but to move only in the vertical direction. The first baffle 318 is provided with a notch 33, the connecting rod 313 penetrates through the notch 33, the second baffle 319 is provided with a through hole, the through hole is provided with an adjusting rod 34, and the adjusting rod 34 can adjust the distance between the connecting rod 313 and the second baffle 319, so as to adjust the stopping resistance of the crank mechanism 312. In the present embodiment, the width of the notch 33 is slightly larger than the thickness of the connection bar 313, and the length of the notch 33 is larger than the width of the connection bar 313.

The power assembly 32 includes a pull rod 321 and a driving mechanism 322 for driving the pull rod 321 to move. One end of the pull rod 321, which is close to the connecting rod 313, is provided with a kidney-shaped hole 324 penetrating through the thickness direction of the pull rod 321, the extending direction of the kidney-shaped hole 324 is the same as that of the pull rod 321, and the pin 323 penetrates through the kidney-shaped hole 324 to rotatably connect the pull rod 321 and the connecting rod 313; the end of the pull rod 321 remote from the connection rod 313 is provided with a fixing plate 325. The tension rod 321 is sleeved with an elastic member 326, the elastic member 326 is located between the fixing plate 325 and the pin 323, one end of the elastic member 326 acts on the fixing plate 325, and the other end acts on the pin 323.

The driving mechanism 322 comprises a motor 327, a shaft sleeve 328 and an output rod 329, and a third baffle 35 is arranged on the shell of the motor 327 and used for fixing the motor; the shaft sleeve 328 is connected to an output shaft of the motor 327, one end of the output rod 329 is rotatably connected to the shaft sleeve 328, and the other end of the output rod 329 is rotatably connected to the fixing plate 325. The motor 327 is used for driving the output rod 329 to rotate so as to drive the pull rod 321 to move, and further drive the connecting rod 313 to move, so that the crank mechanism 312 rotates to drive the locking tongue 311 to move up and down, and the slider 2 can pass over the locking tongue 311 or be resisted by the locking tongue 311, thereby realizing the opening and closing of the fire door. In this embodiment, the length of the pin 323 and the size of the fixing plate 325 are both greater than the diameter of the elastic member 326, the elastic member 326 is preferably a spring, and the motor 327 is preferably a speed reduction motor.

The door closer of the invention realizes the locking of the door closer by utilizing the movement and the stress mechanism of the crank mechanism 312, and the working process and the working principle thereof are briefly described as follows:

the fireproof door is a normally open fireproof door, the fireproof door is in an open state under normal conditions, the spring is in a compression state at the moment, the generated elastic restoring force acts on the pin shaft 323 and the fixing plate 325, the pin shaft 323 is located at one end, far away from the fixing plate 325, of the waist round hole 324, the end portion of the connecting rod 313 is abutted by the adjusting rod 34, bending between the first rotating rod 314 and the second rotating rod 315 is prevented, the sliding block 2 is located on the left side of the locking tongue 311, the second inclined surface 317 with the large gradient of the locking tongue 311 is in contact with the fourth inclined surface 22 of the sliding block 2, resistance of the second inclined surface 317 is large, the elastic force of the door closer is insufficient to push the sliding block 2 to cross the locking tongue 311, and therefore the fireproof door can be stably kept in the open state.

When a fire occurs and the door closer receives a release instruction, the speed reduction motor rotates reversely, the output rod 329 rotates to drive the fixing plate 325, the pull rod 321, the spring and the connecting rod 313 to move leftwards integrally, the first rotating rod 314 and the second rotating rod 315 rotate to drive the locking tongue 311 to move downwards, the sliding block 2 passes over the locking tongue 311 and slides in the sliding groove, the process from door opening to door closing is completed, and the fireproof door is changed from an opening state to a door closing state. Then, the speed reducing motor rotates forwards, the output rod 329 drives the pull rod 321 to rotate rightwards, and further compresses the spring, under the elastic restoring force of the spring, the spring abuts against the pin 323 to push the connecting rod 313 to move rightwards, and the first rotating rod 314 and the second rotating rod 315 are driven to rotate to drive the locking tongue 311 to move upwards; when the speed reducing motor rotates forwards to a right position, the end part of the connecting rod 313 is abutted by the adjusting rod 34 again, the first rotating rod 314 and the second rotating rod 315 cannot be bent, the sliding block 2 is positioned at the right side of the locking tongue 311, the first inclined surface 316 of the locking tongue 311 is contacted with the third inclined surface 21 of the sliding block 2, and the fireproof door is in a closed state.

When the fireproof door is in an open state, the second inclined surface 317 of the locking tongue 311 is in contact with the fourth inclined surface 22 of the sliding block 2, in an emergency situation, the door can be pushed to close manually, an operator pushes the fireproof door to enable the sliding block 2 to slide rightwards gradually, the pressing component force of the sliding block 2 on the locking tongue 311 is greater than the stopping resistance of the crank mechanism 312, the sliding block 2 presses the locking tongue 311 downwards and crosses the locking tongue 311, the first rotating rod 314 and the second rotating rod 315 are bent relatively, the connecting rod 313 and the pin 323 move leftwards to compress the spring leftwards, and the door closing action is completed; when the fire door is completely closed and the manual external force is removed, the spring is released rightwards, the pin shaft 323 and the connecting rod 313 are driven to move rightwards, the locking tongue 311 is driven to move upwards, the sliding block 2 is positioned on the right side of the locking tongue 311, and the first inclined surface 316 with the small gradient of the locking tongue 311 is in contact with the third inclined surface 21 of the sliding block 2.

When the fireproof door is in a closed state, the fireproof door can be pushed by manpower, an operator pushes the fireproof door, the door pushing direction is opposite to the door forcibly closing direction, the sliding block 2 gradually slides leftwards, the locking tongue 311 is pressed easily, and the fireproof door is opened. In the process, the locking tongue 311 moves downwards, the first rotating rod 314 and the second rotating rod 315 bend relatively, the connecting rod 313 and the pin 323 move leftwards, and the spring is compressed leftwards. After the fireproof door is opened, the sliding block 2 is positioned on the left side of the locking tongue 311, the slope of the second inclined surface 317 is large, so that resistance is large, the sliding block 2 can be prevented from passing over the locking tongue 311, and the fireproof door can be naturally kept in an opening state under the effect of no other external force.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.