Invisible fireproof door

Abstract

The invention relates to the field of fireproof doors, in particular to an invisible fireproof door which comprises a door frame and a door body hinged to the door frame, a locking mechanism used for locking the door body is arranged between the door body and the door frame, and the locking mechanism comprises a lock arranged on the door body and a locking assembly arranged on the door frame and used for locking the lock; the locking assembly comprises two clamping arms capable of moving relatively and a linkage block in linkage with the clamping arms. When the linkage block moves from the initial position to the locking position in the first direction, the two clamping arms gradually close to each other to enter a locking state, and the door body is in a closed state at the locking position. When the linkage block crosses the unlocking position in the first direction, the linkage block can return to the initial position in the second direction in an unlocking state; when the door is opened and unlocked, the door body can be unlocked and bounced open only by pushing the door body inwards (namely along the door closing direction), so that force exerting parts such as a handle for assisting in opening the door do not need to be arranged on the door body.

Description

Technical Field

[0001] The present application relates to the field of fire doors, and in particular to an invisible fire door. Background Art

[0002] At present, in order to deal with fires, many public places will install fire cabinets on the walls, and place fire extinguishers, fire hydrants and other fire-fighting equipment in the fire cabinets. Correspondingly, in order to protect these equipment from being affected in case of fire, fire doors are usually installed on the fire cabinets. In order not to destroy the integrity of the wall, some fire doors will be installed in a hidden way, that is, the outer surface of the fire door is decorated in the same way as the wall. When the fire door is closed, the fire door and the wall appear to be integrated visually.

[0003] However, in the related art, a handle is generally provided on the fire door for a person to hold and open the fire door. The provision of the handle will destroy the "invisible" effect of the fire door, so there is still room for improvement. Summary of the invention

[0004] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present application is to provide an invisible fireproof door.

[0005] To achieve the above objectives, this application provides the following technical solutions.

[0006] The invisible fireproof door comprises a door frame and a door body hinged on the door frame, wherein a locking mechanism for locking the door body is provided between the door body and the door frame: The locking mechanism comprises a lock head arranged on the door body and a locking assembly arranged on the door frame for locking the lock head; the locking assembly comprises two clamping arms capable of relative movement and a linkage block linked to the clamping arms; When closing the door, the linkage block can pass through the initial position, the locking position and the unlocking position in sequence along the first direction between the two clamping arms under the push of the lock head: wherein: During the process of the linkage block moving from the initial position to the locking position along the first direction, the two clamp arms gradually move closer to each other and enter a locked state. In the locked state, the two clamp arms restrict the lock head from escaping from the two clamp arms along the door opening direction; and in the locked position, the linkage block is restricted from moving in a second direction opposite to the first direction to keep the two clamp arms in a locked state and the door body in a closed state.

[0007] When the linkage block passes the unlocking position along the first direction, the linkage block can return to the initial position along the second direction in an unlocked state; When the linkage block moves from the locking position to the initial position along the second direction, the two clamping arms gradually open to each other and enter an open state. In the open state, the lock head can freely enter and exit between the two clamping arms.

[0008] As an alternative embodiment of the present application, the locking mechanism further includes a lock box with an open top, and the linkage block moves in the first direction and the second direction in the lock box; a first elastic member is provided between the lock box and the linkage block, and the first elastic member is used to provide an elastic force to drive the linkage block to have a tendency to move in the second direction.

[0009] As an alternative embodiment of the present application, the locking mechanism further includes a locking block, an unlocking block and a second elastic member; a convex portion is provided on the inner wall of the lock box; The locking block is provided on the linkage block and can elastically expand and contract relative to the linkage block in the third direction; the bottom surface of the locking block is inclined to form a first guiding surface; in the locked position, the locking block abuts against the bottom wall of the convex portion; The unlocking block is provided in the lock box and can move in the second direction to fit against the bottom of the convex portion; the end of the unlocking block is inclined to form a second guiding surface opposite to the first guiding surface; The second elastic member is used to provide an elastic force to drive the unlocking block to move away from the convex portion.

[0010] As an alternative embodiment of the present application, a slideway extending in the third direction is provided in the linkage block; the locking block is slidably provided in the slideway; a third elastic member is provided in the slideway, and the third elastic member is used to provide an elastic force to drive the locking block to have a tendency to protrude outwards.

[0011] As an alternative embodiment of the present application, the locking mechanism further includes an emergency unlocking assembly; the emergency unlocking assembly includes a top block, a top rod and a limit block; the top rod is fixed to the bottom of the linkage block; the limit block is provided at the bottom of the lock box and faces the top rod, and in the unlocked position, the top rod abuts against the limit block; and when the pressure received by the limit block from the top rod exceeds a set value, the limit block breaks to release the limit on the top rod; The top block is fixed in the lock box and is used to guide the locking block to contract inwards in the third direction to the locked position when the locking block continues to move in the first direction from the unlocked position. In the locked position, a gap is formed between the end of the locking block and the end of the convex portion in the third direction; an elastic pin is provided on one of the linkage block and the locking block, and a pin hole is provided on the other. When the locking block is in the locked position, the elastic pin is inserted into the pin hole to lock the locking block in the third direction.

[0012] As an alternative embodiment of the present application, a through hole through which the top rod can pass is provided at the bottom of the lock box, and the limit block is fixed in the through hole in a manner of being connected by a fracture line.

[0013] As an alternative embodiment of the present application, the two clamping arms are respectively hinged on both sides of the linkage block; a reset elastic member is provided between the clamping arm and the linkage block, and the reset elastic member is used to provide an elastic force to drive the two clamping arms to have a tendency to move away from each other.

[0014] As an alternative embodiment of the present application, two guiding members corresponding to the two clamping arms are provided in the lock box; when the clamping arm moves along the first direction from the initial position to the locking position with the linkage block, the guiding member pushes against the outer wall of the clamping arm against the elastic force of the reset elastic member to make the two clamping arms close together.

[0015] As an alternative embodiment of the present application, in the initial position, the linkage block abuts against the guiding member and is limited by the guiding member.

[0016] As an alternative embodiment of the present application, the door body is hinged to the door frame through a hinge; the hinge includes: Two hinge seats, which are respectively fixed on the door frame and the door body; Two first connecting rods, the middle parts of the two first connecting rods are hinged to each other, and the first ends of the two first connecting rods are respectively hinged to the two hinge seats; Two second connecting rods, the first ends of the two second connecting rods are respectively hinged to the second ends of the two first connecting rods, and the second ends of the two second connecting rods are respectively hinged to the two hinge seats.

[0017] Compared with the prior art, the present application has the following beneficial effects: In this solution, through the special design of the locking mechanism, the door body can be automatically locked when closing the door, and when opening the door and unlocking, only by pushing the door body inward (i.e., along the closing direction of the door), the door body can be unlocked and bounced open, so there is no need to set a force-applying component such as a handle on the door body for assisting in opening the door.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By referring to the drawings and reading the following detailed description, the above and other objects, features and advantages of the exemplary embodiments of the present application will become easily understood. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, wherein: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0020] Figure 1 is a schematic structural diagram of the present application; Figure 2 is a schematic structural diagram of the locking mechanism when the linkage block of the present application is in the initial position; Figure 3 is Figure 2 a partial enlarged view of; Figure 4 is a schematic structural view of the locking mechanism when the linkage block of the present application is in the locked position; Figure 5 is a schematic structural view of the locking mechanism when the linkage block of the present application is in the unlocked position; Figure 6 is a schematic structural view of the locking mechanism during the unlocking process of the linkage block of the present application; Figure 7 is a schematic structural view of the locking mechanism during emergency unlocking of the present application; Figure 8 is a schematic bottom view of the lock box of the present application.

[0021] Description of reference numerals in the figure: 1. Door frame; 11. Horizontal bar; 111. Inner concave step; 112. Outer concave step; 12. First fireproof seal; 13. First fireproof expansion seal; 14. Second fireproof expansion seal; 2. Door body; 21. Steel plate; 22. Magnesium oxide fireproof door core board; 23. Decorative layer; 24. Lock edge; M. Locking mechanism: 3. Lock head; 31. Connecting rod; 4. Locking component; 40. Lock box; 401. Through hole; 402. Limiting block; 403. Fracture line; 404. Top block; 41. Clamping arm; 42. Linkage block; 421. Top shaft; 422. Top rod; 423. Slideway; 43. Guide; 44. First spring; 45. Locking block; 451. First guiding surface; 452. Pin hole; 453. Third spring; 46. Elastic pin; 461. Pin body; 462. Fourth spring; 47. Convex part; 48. Unlocking block; 481. Second guiding surface; 482. Second spring; 483. Connecting block; 5. Hinge; 50. Hinge seat; 51. First connecting rod; 52. Second connecting rod. Detailed implementation manners

[0022] To make the objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0023] Refer to Figure 1-8As shown in the figure, this embodiment provides an invisible fire door, which includes a door frame 1 and a door body 2 hinged to the door frame 1. A locking mechanism M is provided between the door body 2 and the door frame 1 for locking the door body 2.

[0024] In some embodiments, the door frame 1 is mainly a rectangular frame structure formed by sequentially connecting four horizontal bars 11 at the top, bottom, left, and right end to end. The door frame 1 is fixedly fitted in the door opening of the wall surface.

[0025] The door body 2 is adapted to the door frame 1 to form a rectangular structure. In some embodiments, as Figure 1 shown, in order to improve the fire resistance of the door body 2, the door body 2 mainly includes two oppositely arranged steel plates 21, and a magnesium oxide fire door core board 22 is filled between the two steel plates 21; the edges of the two steel plates 21 are bent and welded to each other.

[0026] In addition, in order to improve the stealth effect, a decorative layer 23 is fixed on the steel plate on the outer side of the door body 2. The decorative layer 23 is the same as or similar to the appearance of the surrounding wall surface. In this way, after the door body 2 is closed, the outside of the door body 2 and the wall surface look like one body.

[0027] One end of the door body 2 is hinged to the door frame 1 through a hinge 5, and the opposite end is the movable end of the door body 2.

[0028] In some embodiments, as Figure 1 shown, the hinge 5 mainly includes two hinge seats 50, two first connecting rods 51 and two second connecting rods 52; among them, the two hinge seats 50 are respectively fixed on the door frame 1 and the door body 2.

[0029] The middle parts of the two first connecting rods 51 are hinged to each other to form a cross-linking structure.

[0030] For the two first connecting rods 51, the first end of one of them is hinged to one of the hinge seats 50, and the first end of the other is hinged to the other hinge seat 50.

[0031] For the two second connecting rods 52, the first end of one of them is hinged to the second end of one of the first connecting rods 51, and the first end of the other is hinged to the second end of the other first connecting rod 51.

[0032] For the two second connecting rods 52, the second end of one of them is hinged to one of the hinge seats 50, and the second end of the other is hinged to the other hinge seat 50.

[0033] Using the above hinge 5 to realize the hinge of the door body 2, its advantage is that when the door body 2 is opened, it can be opened 120° relative to the wall surface.

[0034] In some embodiments, in order to improve the sealing performance, a protruding locking edge 24 is formed at the movable end of the door body 2; correspondingly, two concave steps are formed on the cross bar 11 on the side of the door frame 1 close to the movable end of the door body 2, namely an outer concave step 111 and an inner concave step 112. The outer concave step 111 is for the locking edge to be inserted, and the inner concave step 112 is for the inner corner of the door body 2 to be inserted. A first fireproof sealing member 12 is fixed on the inner concave step, and a first fireproof expansion sealing member 13 is provided on the side of the locking edge 24 facing the outer concave step 112.

[0035] In addition, a second fireproof expansion sealing member 14 is fixed at one end of the decorative layer 23 close to the hinge 5, and the second fireproof expansion sealing member 14 is located between the gap between the decorative layer and the wall surface.

[0036] Combined Figure 1 As shown, the locking mechanism M is mainly used to lock the door body 2 when the door body 2 is closed; the locking mechanism M includes a lock head 3 provided on the door body 2 and a locking assembly 4 provided on the door frame 1 for locking the lock head 3.

[0037] In some embodiments, as Figure 2 shown, the lock head 3 is spherical, and it is fixedly connected to the door body 2 through a connecting rod 31, so that the lock head 3 can move synchronously with the door body 2.

[0038] The locking assembly 4 includes a lock box 40, two relatively movable clamping arms 41 and a linkage block 42 linked with the clamping arms 41; the lock box 40 is fixed on the cross bar 11 on one side of the movable end of the door body 2, the clamping arms 41 and the linkage block 42 are both installed on the lock box 40, and the top of the lock box 40 is open.

[0039] The linkage block 42 is configured as: When the door is closed, that is, when the door body 2 is gradually closed, the linkage block 42 can be pushed by the lock head 3 and sequentially pass through the initial position, the locking position and the unlocking position between the two clamping arms 41 in the first direction.

[0040] In the initial position, as Figure 2 shown, the lock head 3 just contacts the linkage block 42. Starting from the initial position, as the door body 2 continues to rotate in the closing direction, the lock head 3 pushes the linkage block 42 to sequentially pass through the locking position and the unlocking position. It should be noted that in the locking position, the door body 2 is in the closed state, that is, the door body 2 is basically parallel to the wall surface.

[0041] In some embodiments, for the convenience of description, the direction opposite to the first direction is denoted as the second direction. Specifically in this embodiment, both the first direction and the second direction can be understood as the direction perpendicular to the wall surface. The difference is that the first direction can be understood as the direction towards the inside of the wall, while the second direction can be understood as the direction towards the outside of the wall.

[0042] During the process of the linkage block 42 moving from the initial position to the locking position along the first direction, the two clamping arms 41 gradually approach each other and enter the locked state. In the locked state, as Figure 4 shown, the two clamping arms 41 restrict the lock head 3 from disengaging from between the two clamping arms 41 in the door-opening direction; and in the locked position, as Figure 4 shown, the linkage block 42 is restricted from moving along the second direction to keep the two clamping arms 41 in the locked state. That is, in the locked position, the linkage block 42 can continue to move forward along the first direction, but cannot retreat along the second direction, so as to keep the clamping arms 41 in the locked state.

[0043] When the linkage block 42 moves beyond the unlocking position along the first direction, as Figure 5 shown, the linkage block 42 can return to the initial position along the second direction in an unlocked state; that is, when the linkage block 42 moves beyond the unlocking position, the restriction of the linkage block 42 in the second direction is released, enabling the linkage block 42 to freely return to the initial position along the second direction.

[0044] And when the linkage block 42 moves from the locked position to the initial position along the second direction, the two clamping arms 41 gradually open and enter the open state. In the open state, as Figure 2 shown, the lock head 3 can freely enter and exit between the two clamping arms 41.

[0045] With the above settings, for the fire door provided in this embodiment, its specific door-opening and door-closing actions are as follows: that is, when closing the door, during the process of the door body 2 gradually closing, the following several stages will be passed through in sequence. First, when the door body 2 rotates to the position where the lock head 3 just abuts against the linkage block 42 (at this time, the linkage block 42 is in the initial position, as Figure 2 shown), then, as the door body 2 continues to close, the lock head 3 pushes the linkage block 42 to continue moving forward along the first direction until the linkage block 42 reaches the locked position (as Figure 4 shown). During this process, the two clamping arms 41 gradually approach each other and finally hold the lock head 3, entering the locked state. At this time, under the restriction of the two clamping arms 41, the lock head 3 cannot be withdrawn from between the two clamping arms 41, thus realizing the locking of the door body 2. At this time, the door body 2 is in the closed state, and the door-closing action is completed.

[0046] When the door needs to be opened, continue to push the door body 2 inward along the door-closing direction. At this time, the lock head 3 will continue to push the linkage block 42 along the first direction, causing the linkage block 42 to gradually advance to the unlocking position (as Figure 5 shown). When the linkage block 42 moves beyond the unlocking position, the linkage block 42 can freely reset to the initial position along the second direction. During the reset process, the two clamping arms 41 will gradually open, thus gradually releasing the hold on the lock head 3, and the linkage block 42 will push the lock head 3 along the second direction, and the door body 2 will bounce open in the door-opening direction, thus realizing the door-opening action.

[0047] It can be seen that in this solution, through the special design of the locking mechanism M, the door body 2 can be automatically locked when the door is closed, and when the door is opened and unlocked, only by pushing the door body 2 inward (i.e., along the door closing direction), the door body 2 can be unlocked and bounced open. Thus, there is no need to set up a handle or other force-applying components for assisting in opening the door on the door body 2.

[0048] In short, the locking and opening method of this door body 2 is that by pressing the door body 2 inward once, the door body 2 closes and locks, and by pressing the door body 2 again, the door body 2 opens and bounces open automatically.

[0049] In this embodiment, the specific structures of the two clamping arms 41 and the linkage block 42 are as follows: As Figure 2 shown, the two clamping arms 41 are respectively hinged on both sides of the linkage block 42. Specifically, the top of the linkage block 42 extends upward to form a top shaft 421, and the lower ends of the two clamping arms 41 are hinged on both sides of the top shaft 421; in order to adapt to the spherical lock head 3, in this embodiment, the lower part of the clamping arm 41 is in a straight line to form a straight arm part, and the upper part of the clamping arm 41 is bent inward to form an arc-shaped bending part for holding the lock head 3. In the locked state, the bending parts of the two clamping arms 41 resist against the upper part of the lock head 3 to limit the lock head 3 from coming out and achieve locking.

[0050] A reset elastic member is provided between the clamping arm 41 and the linkage block 42. The reset elastic member is used to provide an elastic force to drive the two clamping arms 41 to have a tendency to move away from each other; in some embodiments, the reset elastic member can adopt a torsion spring (not shown in the figure), and the torsion spring is arranged at the hinge point of the clamping arm 41. Relying on the torsion of the torsion spring, the clamping arm 41 has a tendency to turn outward, that is, the two clamping arms 41 have a tendency to move away from each other.

[0051] In the initial position, as Figure 2 shown, under the torsion of the torsion spring, the two clamping arms 41 turn outward and finally abut against the upper port of the lock box 40 so that the clamping arms 41 are kept in an open state for the lock head 3 to be inserted.

[0052] Taking Figure 2 the perspective direction shown as an example, the first direction can be understood as the downward direction, and the second direction can be understood as the upward direction.

[0053] In addition, two guiding members 43 corresponding to the two clamping arms 41 are provided in the lock box 40; when the clamping arm 41 moves along the first direction from the initial position to the locked position with the linkage block 42, the clamping arm 41 will move downward. When the outer walls of the two clamping arms 41 reach the position of the guiding member 43, as the clamping arm 41 continues to move downward, the guiding member 43 will abut against the clamping arm 41, causing the clamping arm 41 to gradually turn inward against the elastic force of the reset elastic member to achieve the mutual closing of the two clamping arms 41. In the locked state, the straight arm parts of the two clamping arms 41 are parallel to each other and generally extend along the first direction.

[0054] That is to say, in this embodiment, the function of the guiding member 43 is to drive the clamping arm 41 to turn inward and enter the locked state during the downward movement of the clamping arm 41.

[0055] In order to reduce the friction force between the guiding member 43 and the clamping arm 41, the guiding member 43 is preferably a roller.

[0056] The linkage block 42 can move in the first direction and the second direction in the lock box 40; a first elastic member is provided between the lock box 40 and the linkage block 42, and the first elastic member is used to provide an elastic force to drive the linkage block 42 to have a tendency to move in the second direction, that is, the linkage block 42 is mainly driven to reset by the first elastic member.

[0057] In some embodiments, the first elastic member can be a first spring 44. The first spring 44 extends in the first direction, one end of which is fixed to the bottom of the linkage block 42, and the other end is fixed to the bottom of the lock box 40. The first spring 44 pushes the linkage block 42 to move upward (i.e., move in the second direction).

[0058] In the initial position, as Figure 2 shown, under the pushing of the first spring 44, the linkage block 42 abuts against the bottom of the guiding member 43 to maintain the initial position.

[0059] When closing the door, under the pushing of the lock head 3, the linkage block 42 will overcome the thrust of the first spring 44 and move downward from the initial position to the locked position. During this process, the two clamping arms 41 gradually close together to hold the lock head 3; and when the linkage block 42 reaches the locked position, it will be locked and cannot move upward (i.e., in the second direction); thus, the two clamping arms 41 will maintain the locked state and lock the lock head 3, so as to realize the locking after the door body 2 is closed.

[0060] After the linkage block 42 reaches the locked position, as Figure 4 shown, it can still continue to move downward to cross the unlocking position for unlocking. When the linkage block 42 crosses the unlocking position, as Figure 5 shown, the locking of the linkage block 42 in the second direction (i.e., upward) is released. Under the elastic pushing of the first spring 44, it will push the linkage block 42 to move upward, and then the linkage block 42 pushes the clamping arm 41 and the lock head 3 to move upward; during the upward movement of the clamping arm 41, after the clamping arm 41 crosses the guiding member 43, the clamping arm 41 will gradually turn outward under the torsion of the torsion spring, and finally at the initial position, it presents an open state; and under the pushing of the linkage block 42, it will push the lock head 3 and the door body 2 to bounce in the opening direction to realize opening the door.

[0061] In order to realize the locking and unlocking actions of the linkage block 42, in this embodiment, in combination with Figure 2 and Figure 3As shown, the locking mechanism M further includes a locking block 45, an unlocking block 48 and a second elastic member; a convex portion 47 is fixed on the inner wall of the lock box 40; in this embodiment, the convex portion 47 is generally triangular, and the top surface is the hypotenuse of the triangle.

[0062] The locking block 45 is arranged on the linkage block 42 and can elastically expand and contract relative to the linkage block 42 in a third direction. In this embodiment, the third direction is perpendicular to the first direction. Taking the Figure 2 viewpoint shown as an example, it can be understood as horizontal.

[0063] Specifically, as Figure 3 shown, a slideway 423 extending in the third direction is provided in the linkage block 42; the locking block 45 is slidably arranged in the slideway 423 and cannot rotate in the slideway 423; a third elastic member is provided in the slideway 423, and the third elastic member is used to provide an elastic force to drive the locking block 45 to have a tendency to protrude outwards, so as to realize the elastic expansion and contraction of the locking block 45.

[0064] In some embodiments, two sets of locking blocks 45 and convex portions 47 are provided, symmetrically arranged on both sides of the linkage block 42; the slideway 423 penetrates the linkage block 42 in the third direction, and the two locking blocks 45 are installed in the same slideway 423. The third elastic member can be a third spring 453. The third spring 453 is arranged in the slideway 423, and its two ends are respectively fixed to or abutted against the two locking blocks 45. Relying on the elastic force of the third spring 453, the locking block 45 is pushed to protrude outwards, or in other words, move away from each other.

[0065] As Figure 3 shown, the front bottom surface of the locking block 45 is inclined to form a first guiding surface 451. During the process of the linkage block 42 moving downward from the initial position to the locking position, the first guiding surface 451 of the locking block 45 will contact the convex portion 47. As the locking block 45 continues to move downward, under the pushing of the convex portion 47, the locking block 45 will gradually contract inward against the elastic force of the third spring 453 and finally cross over the convex portion 47; when it crosses over the convex portion 47, under the elastic force of the third spring 453, the locking block 45 will protrude out again. In this way, the convex portion 47 will form a limit on the upper side of the locking block 45. Under the elastic force of the first spring 44, the linkage block 42 is pushed upward, so that the upper wall of the locking block 45 abuts against the lower wall of the convex portion 47. At this time, the locking block 45 is kept in the locking position (as Figure 4 shown) and cannot continue to move upward.

[0066] The unlocking block 48 is arranged in the lock box 40 and is located below the convex portion 47. The unlocking block 48 is slidably connected to the lock box 40 in the vertical direction, that is, the unlocking block 48 can move up and down in the lock box 40. When the unlocking block 48 moves to the highest point, its top wall fits against the bottom wall of the convex portion 47 (as Figure 6As shown); the end bottom wall of the unlocking block 48 is inclined to form a second guiding surface 481 that is opposite to the first guiding surface 451; in some embodiments, the first guiding surface 451 is perpendicular to the second guiding surface 481. For example, the inclination angle of the first guiding surface 451 is +45°, and the inclination angle of the second guiding surface 481 is -45°.

[0067] The second elastic member is used to provide an elastic force to drive the unlocking block 48 to move away from the convex portion 47, that is, the second elastic member is used to drive the unlocking block 48 to move downward; specifically, the second elastic member can adopt a second spring 482; an L-shaped connecting block 483 is provided in the lock box 40. The second spring 482 extends vertically, with one end fixed to the connecting block 483 and the other end fixed to the unlocking block 48; under the pulling force of the second spring 482, the unlocking block 48 abuts against the upper end of the connecting block 483.

[0068] During the process of the locking block 45 continuing to move downward with the linkage block 42 from the locking position, when the first guiding surface 451 of the locking block 45 contacts the tip of the unlocking block 48 and continues to move downward, under the push of the unlocking block 48, the locking block 45 will contract inward to cross the tip of the unlocking block 48; after crossing the tip, the third spring 453 pushes the locking block 45 to extend outward to abut against the second guiding surface 481; at this time, if the pressing force of the human hand on the door body 2 is released, under the push of the first spring 44, the linkage block 42 and the locking block 45 will move upward; during this process, the locking block 45 will abut against the second guiding surface 481 and pull the unlocking block 48 to move upward until the unlocking block 48 abuts against the convex portion 47 (as Figure 6 shown), at this time the unlocking block 48 cannot continue to move upward. In this way, when the locking block 45 continues to move upward, the second guiding surface 481 will push the locking block 45 to gradually contract inward until it finally crosses the convex portion 47 to achieve unlocking. In this way, it can be realized that the locking block 45 can move along the second direction after passing the unlocking position.

[0069] In practical applications, since the unlocking of the clamping arm 41 is essentially achieved by the unlocking block 48 moving upward to guide the locking block 45 to cross the convex portion 47, therefore, if the unlocking block 48 fails, for example, the unlocking block 48 gets stuck and cannot slide upward normally, the clamping arm 41 cannot be unlocked, so that the door body 2 cannot be opened; at this time, if it is necessary to open the door body 2, it is usually necessary to damage the structure of the door body 2 to open the door body 2.

[0070] Based on this, in order to be able to open the door body 2 without damaging the door body 2, in some embodiments, the locking mechanism M further includes an emergency unlocking assembly, and the emergency unlocking assembly includes a top block 404, a top rod 422 and a limit block 402.

[0071] The top rod 422 is fixed to the bottom of the linkage block 42 and extends vertically.

[0072] The limiting block 402 is provided at the bottom of the lock box 40 and faces the ejector rod 422, and is used to block the downward movement of the ejector rod 422 to limit its downward movement.

[0073] Among them, when the linkage block 42 is in the unlocking position, the ejector rod 422 and the limiting block 402 are in a state of abutting against each other. In other words, when unlocking, the door body 2 is pushed downward in the closing direction by hand to drive the linkage block 42 to move downward. When the linkage block 42 is pushed downward until the ejector rod 422 abuts against the limiting block 402, the linkage block 42 reaches the unlocking position. At this time, when the hand is released, the door body 2 will bounce open.

[0074] The top block 404 is fixed in the lock box 40 and is used to guide the locking block 45 to contract inward along the third direction to the locking position when the locking block 45 continues to move along the first direction from the unlocking position; specifically, the top block 404 is in the shape of a straight plate, abuts against the side of the linkage block 42 and extends vertically, and the linkage block 42 can slide vertically relative to the top block 404.

[0075] The upper end of the top block 404 is the end for pushing against the locking block 45. Among them, the upper end of the top block 404 is lower than the unlocking block 48; and when the ejector rod 422 abuts against the limiting block 402, the upper end of the top block 404 does not contact the locking block 45. For example, at this time, the upper end of the top block 404 is just flush with the bottom surface of the slideway 423; in this way, it is ensured that when the linkage block 42 moves downward to unlock through the unlocking block 48, the locking block 45 will not be pushed inward by the top block 404.

[0076] Among them, the limiting block 402 and the lock box 40 are not strongly fixed, but are arranged such that when the pressure exerted on the limiting block 402 by the ejector rod 422 exceeds a set value, the limiting block 402 breaks to release the limit on the ejector rod 422. For example, as shown in Figure 8 As shown, a through hole 401 through which the ejector rod 422 can pass is provided at the bottom of the lock box 40, and the limiting block 402 is fixed in the through hole 401 in a manner of being connected by a fracture line 403 (or a break point). In this way, when the limiting block 402 is subjected to a strong impact, the position of the fracture line 403 will break, causing the limiting block 402 to break away from the connection with the lock box 40.

[0077] In this way, when the unlocking block 48 fails and cannot be unlocked normally, the door body 2 can be pushed downward in the closing direction with force. In this way, the door body 2 will push the linkage block 42 downward through the lock head 3, and then the ejector rod 422 will push the limiting block 402 downward. When the force is large enough, the ejector rod 422 will push open the limiting block 402. Without the restriction of the limiting block 402, the linkage block 42 and the ejector rod 422 can continue to move downward. During the continuous downward movement, the upper end of the top block 404 will squeeze the first guiding surface 451, causing the locking block 45 to contract inward to reach the locking position.

[0078] In the locked position, an end portion of the locking block 45 (i.e., an end of the locking block 45 close to the unlocking block 48) forms a gap in the third direction between the end portion of the convex portion 47 and the end portion of the locking block 45; preferably, in the locked position, the end portion of the locking block 45 shrinks to be flush with the side surface of the linkage block 42.

[0079] The significance of such a setting is that when the locking block 45 moves upward together with the linkage block 42 while maintaining the locked position, the convex portion 47 and the unlocking block 48 will not block the locking block 45, so as to achieve unlocking.

[0080] In order to keep the locking block 45 in the locked position, an elastic pin 46 is provided on one of the linkage block 42 and the locking block 45, and a pin hole 452 is provided on the other. When the locking block 45 is in the locked position, as Figure 7 shown, the elastic pin 46 is inserted into the pin hole 452 to lock the locking block 45 in the third direction; for example, in this embodiment, as Figure 3 shown, the elastic pin 46 is provided on the linkage block 42, and the locking hole is provided on the locking block 45. Specifically: The elastic pin 46 includes a pin body 461 and a fourth spring 462. An installation hole extending vertically and communicating with the slideway 423 is formed inside the locking block 45. The pin body 461 is slidably connected to the installation hole in the vertical direction. The fourth spring 462 is arranged in the installation hole and is fixed to the top wall of the installation hole and the upper end of the pin body 461 respectively. Under the elastic force of the fourth spring 462, the outer end of the pin body 461 is pushed to abut against the top wall of the locking block 45.

[0081] When the locking block 45 is pushed to the locked position by the top block 404, at this time the pin hole 452 is exactly aligned with the pin body 461. In this way, the pin body 461 will be inserted into the pin hole 452 under the elastic force of the fourth spring 462. In this way, the pin body 461 locks the locking block 45, so that the locking block 45 cannot expand and contract in the third direction (i.e., the left - right direction), enabling the locking block 45 to maintain the locked position and move upward with the linkage block 42 for emergency unlocking.

[0082] It should be understood that various forms of the processes shown above can be used, re - ordering, adding, or deleting steps. For example, the steps described in this application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this application can be achieved. This is not limited herein.

[0083] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0084] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claimed rights.

Claims

1. Invisible fire door, comprising a door frame and a door body hinged to the door frame, a locking mechanism for locking the door body is provided between the door body and the door frame, characterized in that the locking mechanism includes a lock head provided on the door body and a locking assembly provided on the door frame for locking the lock head; the locking assembly includes two relatively movable clamping arms and a linkage block linked to the clamping arms; when closing the door, the linkage block can be pushed by the lock head and sequentially pass through the initial position, the locking position and the unlocking position between the two clamping arms along the first direction: where: during the process of the linkage block moving from the initial position to the locking position along the first direction, the two clamping arms gradually approach each other and enter the locking state. In the locking state, the two clamping arms restrict the lock head from disengaging from between the two clamping arms along the door opening direction; and in the locking position, the linkage block is restricted from moving along the second direction opposite to the first direction to keep the two clamping arms in the locking state, and the door body is in the closed state. when the linkage block passes beyond the unlocking position along the first direction, the linkage block can return to the initial position along the second direction in an unlocked state; when the linkage block moves from the locking position to the initial position along the second direction, the two clamping arms gradually open and enter the open state. In the open state, the lock head can freely enter and exit between the two clamping arms.

2. The invisible fire door according to claim 1, wherein the locking mechanism further includes a lock box with an open top, and the linkage block moves in the lock box along the first direction and the second direction; a first elastic member is provided between the lock box and the linkage block, and the first elastic member is used to provide an elastic force to drive the linkage block to have a tendency to move along the second direction.

3. The invisible fire door according to claim 2, characterized in that, the locking mechanism further includes a locking block, an unlocking block and a second elastic member; a convex portion is provided on the inner wall of the lock box; the locking block is provided on the linkage block and can elastically expand and contract relative to the linkage block along the third direction; the bottom surface of the locking block is inclined to form a first guiding surface; in the locking position, the locking block abuts against the bottom wall of the convex portion; the unlocking block is provided in the lock box and can move along the second direction to fit with the bottom of the convex portion; the end of the unlocking block is inclined to form a second guiding surface opposite to the first guiding surface; the second elastic member is used to provide an elastic force to drive the unlocking block to move away from the convex portion; 4. The invisible fire door according to claim 3, wherein a slideway extending along the third direction is provided in the linkage block; the locking block is slidably provided in the slideway; a third elastic member is provided in the slideway, and the third elastic member is used to provide an elastic force to drive the locking block to have a tendency to protrude outwards; 5. The invisible fireproof door according to claim 3, characterized in that, the locking mechanism further includes an emergency unlocking assembly; the emergency unlocking assembly includes a top block, a top rod and a limit block; the top rod is fixed to the bottom of the linkage block; the limit block is provided at the bottom of the lock box and is opposite to the top rod. In the unlocking position, the top rod abuts against the limit block; and when the pressure received by the limit block from the top rod exceeds a set value, the limit block disconnects to release the limit on the top rod; The top block is fixed inside the lock box and is used to guide the locking block to contract inward along the third direction to the locking position when the locking block continues to move along the first direction from the unlocking position. In the locking position, a gap is formed between the end of the locking block and the end of the convex part in the third direction; one of the linkage block and the locking block is provided with an elastic pin, and the other is provided with a pin hole. When the locking block is in the locking position, the elastic pin is inserted into the pin hole to lock the locking block in the third direction.

6. The invisible fire door according to claim 5, characterized in that, A through hole through which the ejector rod can pass is provided at the bottom of the lock box, and the limiting block is fixed in the through hole in a manner connected by a break line.

7. The invisible fireproof door according to claim 2, characterized in that, The two clamping arms are respectively hinged on both sides of the linkage block; a reset elastic member is provided between the clamping arm and the linkage block, and the reset elastic member is used to provide an elastic force to drive the two clamping arms to have a tendency to move away from each other.

8. The invisible fire door according to claim 7, characterized in that, Two guiding members corresponding to the two clamping arms are provided inside the lock box; when the clamping arm moves from the initial position to the locking position along the first direction with the linkage block, the guiding member pushes against the outer wall of the clamping arm to overcome the elastic force of the reset elastic member so that the two clamping arms are close to each other.

9. The invisible fireproof door according to claim 8, characterized in that, In the initial position, the linkage block abuts against the guiding member and is limited by the guiding member.

10. The invisible fireproof door according to claim 1, characterized in that, The door body is hinged to the door frame through a hinge; the hinge includes: Two hinge seats respectively fixed on the door frame and the door body; Two first connecting rods, the middle parts of the two first connecting rods are hinged to each other, and the first ends of the two first connecting rods are respectively hinged to the two hinge seats; Two second connecting rods, the first ends of the two second connecting rods are respectively hinged to the second ends of the two first connecting rods, and the second ends of the two second connecting rods are respectively hinged to the two hinge seats.

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