A sealed steel fire door

Abstract

The application relates to the technical field of building safety protection and fireproof equipment, in particular to a sealed steel fireproof door which comprises a fireproof door body, a door locking module is arranged on the fireproof door body; the door locking module comprises a locking box, a lock cylinder assembly and a closing assembly are arranged in the locking box; a keyhole is arranged on the lock cylinder assembly; a lock hole coaxial with the keyhole is formed in the locking box; a first rotating cylinder is rotationally connected to the locking box, and a handle is slidingly connected to the first rotating cylinder; the closing assembly comprises a shielding plate arranged in the locking box, a first through hole is formed in the shielding plate, a wedge is arranged on a first sliding rod, and a wedge groove matched with the wedge is arranged on the shielding plate. The application can block the lock hole through the shielding plate, bidirectional limiting of the limiting rod and the locking block can improve the anti-theft performance, the operation is convenient, the torsional spring and the compression spring can automatically reset the shielding lock hole.

Description

Technical Field

[0001] This application relates to the technical field of building safety protection and fire prevention equipment, and in particular to a sealed steel fire door. Background Technology

[0002] Steel fire doors play a crucial role in modern building fire safety systems. They not only need excellent fire resistance and heat insulation performance but also a certain level of burglarproof functionality. However, the keyholes of existing steel fire doors are exposed after locking. This allows criminals to use lock-picking tools to damage or pry open the lock cylinder through the keyhole, leading to the illegal opening of the fire door and failing to effectively guarantee the security of the building's interior.

[0003] A search revealed Chinese Patent Publication No. CN222376350U, which discloses a steel insulated fireproof door, including a frame. A door panel is hinged inside the frame. Several U-shaped fixing plates are fixedly connected to the top surface of the frame. The U-shaped fixing plates are arranged in a linear and symmetrical distribution. An L-shaped fixing plate is fixedly connected to the top of each U-shaped fixing plate, and the other end of the L-shaped fixing plate is fixedly connected to the frame. A bidirectional heat-insulating water curtain mechanism is provided between the L-shaped fixing plate and the U-shaped fixing plate.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: In existing fire doors, the keyhole is exposed after locking, allowing criminals to damage or pry open the lock cylinder. This application addresses the problem of exposed keyholes in existing steel fire doors, which are easily pried open, by implementing improvements such as sealing the keyhole with a baffle plate, a linked mechanism, and automatic spring reset, thereby enhancing both anti-theft performance and ease of operation. Utility Model Content

[0005] To improve the anti-theft properties of fire doors, this application provides a sealed steel fire door.

[0006] This application provides a sealed steel fire door, employing the following technical solution: It includes a fire door body, on which a locking module is installed; the locking module includes a locking box, within which a lock cylinder assembly and a sealing assembly are installed; the lock cylinder assembly has a keyhole; the locking box has a lock hole coaxial with the keyhole; the locking box is rotatably connected to a first rotating cylinder, and the first rotating cylinder is slidably connected to a handle; the sealing assembly includes a baffle plate installed inside the locking box, the baffle plate having a first through hole, and a first fixing rod fixedly installed on the inner wall of the locking box, inserted into the first through hole; the handle has a first sliding rod, the first sliding rod having a wedge block, and the baffle plate having a wedge groove adapted to the wedge block. The baffle plate seals the keyhole, preventing unauthorized individuals from prying open the keyhole through the keyhole.

[0007] Optionally, a limiting rod located on one side of the baffle is vertically slidably connected inside the locking box, and a second sliding rod is provided on the lower end face of the limiting rod.

[0008] Optionally, the locking box is provided with a second sliding cylinder adapted to the second sliding rod, and a compression spring is provided between the lower end face of the second sliding rod and the bottom wall of the second sliding cylinder.

[0009] Optionally, the second sliding rod is provided with a connecting part, and the connecting part is provided with a first inclined block.

[0010] Optionally, the first sliding rod is provided with a second inclined block that matches the first inclined block, and the lower end face of the second inclined block is provided with an arc-shaped block.

[0011] Optionally, a locking block is fixedly provided on the other side of the inner baffle of the locking box.

[0012] Optionally, a second rotating cylinder is rotatably connected to the lock cylinder assembly, and the second rotating cylinder is slidably connected to the first sliding rod.

[0013] Optionally, a torsion spring is provided between the second rotating cylinder and the first sliding rod, with one end of the torsion spring fixedly connected to the second rotating cylinder and the other end of the torsion spring fixedly connected to the first sliding rod.

[0014] In summary, this application includes the following beneficial technical effects:

[0015] 1. This utility model, by setting a baffle plate, can block the keyhole after locking, preventing criminals from inserting tools into the keyhole to pry the lock; at the same time, the limiting rod and the locking block cooperate to form a two-way limiting of the baffle plate, further preventing the baffle plate from being moved by external force, effectively improving the anti-theft performance of the fire door and ensuring the safety of the building interior.

[0016] 2. In this utility model, when the owner pushes the handle, the wedge block and the wedge groove, and the inclined block and the inclined block cooperate to move the cover plate away from the lock hole, making it easy to insert the key to unlock; after the door is opened, the torsion spring drives the handle to return to its circumferential position, so that the cover plate covers the lock hole again, without the need for manual operation to reset; after the handle is slid outward, the compression spring drives the limit rod to reset, limiting the cover plate again. The whole process is convenient to operate and can automatically restore the anti-theft state. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the locking box structure in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the structure of the enclosed component in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the handle structure in an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the locking block and locking rod in the embodiments of this application;

[0022] Figure 6 This is a structural schematic diagram of the closed component from another perspective in an embodiment of this application.

[0023] Reference numerals in the attached drawings: 1. Fire door body; 2. Locking box; 3. Keyhole; 4. Lock hole; 5. First rotating cylinder; 6. Handle; 7. Cover plate; 8. First through hole; 9. First fixing rod; 10. First sliding rod; 11. Wedge groove; 12. Wedge block; 13. Limiting rod; 14. Second sliding rod; 15. Second sliding cylinder; 16. Connecting part; 17. First inclined block; 18. Second inclined block; 19. Arc-shaped block; 20. Locking block; 21. Second rotating cylinder; 22. Torsion spring. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-6 This application will be further described in detail below. The technical solutions in the embodiments of this application will be clearly described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0025] This application discloses a sealed steel fire door. For example... Figure 1 As shown, the fire door includes a fire door body 1, on which a locking module is provided; the locking module includes a locking box 2, which contains a lock cylinder assembly and a sealing assembly; the lock cylinder assembly has a keyhole 3; the locking box 2 has a lock hole 4 coaxial with the keyhole 3; the locking box 2 is rotatably connected to a first rotating cylinder 5, which is slidably connected to a handle 6; the sealing assembly includes a baffle plate 7 inside the locking box 2, which has a first through hole 8, and a first fixing rod 9 fixedly installed in the first through hole 8 on the inner wall of the locking box 2; the handle 6 has a first sliding rod 10, which has a wedge block 12, and the baffle plate 7 has a wedge groove 11 that matches the wedge block 12;

[0026] In this embodiment, after the lock is engaged, the baffle plate 7 blocks the lock hole 4 inside the lock box 2, thereby preventing criminals from inserting tools into the keyhole 3 to pry the lock.

[0027] When unlocking is required, the homeowner pushes the handle 6 toward the fire door body 1, causing the wedge 12 to insert into the wedge groove 11. Then, by turning the handle 6, the cover plate 7 moves away from the lock hole 4. The homeowner inserts the key into the keyhole 3 from the lock hole 4 and turns the key to unlock.

[0028] Please see Figure 3 , Figure 5 and Figure 6 A limiting rod 13 located on one side of the baffle plate 7 is vertically slidably connected inside the locking box 2. A second sliding rod 14 is provided on the lower end face of the limiting rod 13. A second sliding cylinder 15 adapted to the second sliding rod 14 is provided inside the locking box 2. A compression spring is provided between the lower end face of the second sliding rod 14 and the bottom wall of the second sliding cylinder 15. A connecting part 16 is provided on the second sliding rod 14. A first inclined block 17 is provided on the connecting part 16. A second inclined block 18 adapted to the first inclined block 17 is provided on the first sliding rod 10. An arc-shaped block 19 is provided on the lower end face of the second inclined block 18. A locking block 20 is fixedly provided on the other side of the baffle plate 7 inside the locking box 2.

[0029] In this embodiment, the shielding plate 7 is limited by the side wall of the limiting rod 13 and the fixed locking block 20 to prevent criminals from moving the shielding plate 7.

[0030] When the owner needs to open the door, they push the handle 6 towards the fire door body 1. The second inclined block 18 on the handle 6 abuts against the first inclined block 17, and the horizontal movement of the first sliding rod 10 of the handle 6 is converted into the vertical sliding of the second sliding rod 14 driven by the connecting part 16. The second sliding rod 14 drives the limiting rod 13 to move downward, releasing the restriction on the cover plate 7, and compressing the compression spring at the same time. Then, the handle 6 is rotated, and the handle 6 moves the cover plate 7 away through the wedge block 12 and the wedge groove 11, so that the key can be inserted into the keyhole 3. The arc-shaped block 19 on the second inclined block 18 makes it easier to rotate the handle 6 and reduce friction.

[0031] Please see Figure 3 and Figure 6 The lock cylinder assembly is rotatably connected to a second rotating cylinder 21, which is slidably connected to a first sliding rod 10. A torsion spring 22 is provided between the second rotating cylinder 21 and the first sliding rod 10. One end of the torsion spring 22 is fixedly connected to the second rotating cylinder 21, and the other end of the torsion spring 22 is fixedly connected to the first sliding rod 10.

[0032] In this embodiment, when the owner turns the handle 6 to move the cover plate 7 away, the torsion spring 22 stores force; when the door is opened, the torsion spring 22 drives the handle 6 to reset in the circumferential direction, and the cover plate 7 re-covers the lock hole 4; when the owner slides the handle 6 outward, the handle 6 resets in the axial direction, the second inclined block 18 no longer abuts against the first inclined block 17, the compression spring drives the limit rod 13 to reset, and the limit rod 13 cooperates with the limit block to limit the cover plate 7, preventing criminals from prying the lock through the lock hole 4.

[0033] The implementation principle of a sealed steel fire door in this application embodiment is as follows:

[0034] The shield 7 is located inside the locking box 2 and is fitted onto the first fixed rod 9 through the first through hole 8. The fixed rod restricts the movement range of the shield 7, so that it completely covers the lock hole 4 on the locking box 2, preventing criminals from prying open the lock cylinder through the lock hole 4. The limiting rod 13 is connected to the second sliding cylinder 15 through the second sliding rod 14. The compression spring is in its natural state, pushing the limiting rod 13 to move upward, so that its side wall abuts against one side of the shield 7. At the same time, the other side of the shield 7 abuts against the fixed locking block 20, forming a bidirectional limiting to prevent the shield 7 from being moved by external force. The handle 6 is in the initial position, and the first sliding rod 10 on it does not push the wedge block 12 into the wedge groove 11 of the shield 7, so the shield 7 remains stationary.

[0035] The homeowner pushes the handle 6 horizontally towards the fire door body 1, causing the first sliding rod 10 and the wedge block 12 to move synchronously, so that the wedge block 12 is inserted into the wedge groove 11 of the baffle plate 7; at the same time, the second inclined block 18 on the handle 6 abuts against the first inclined block 17 on the second sliding rod 14. Due to the inclined surface, the horizontal thrust is converted into the vertical downward sliding of the second sliding rod 14, the compression spring is compressed, and the limiting rod 13 moves down with the second sliding rod 14, releasing the limitation on the baffle plate 7; the arc-shaped block 19 at the lower end of the second inclined block 18 reduces the rotational resistance, making subsequent operations easier;

[0036] After pushing handle 6 into place, rotate handle 6 (driving the first rotating cylinder 5 to rotate). Through the cooperation of wedge block 12 and wedge groove 11, drive the cover plate 7 to slide along the first fixed rod 9, move the lock hole 4 position, and expose the lock hole 4 on the lock box 2 and the key hole 3 of the lock cylinder assembly. At this time, the second rotating cylinder 21 of the lock cylinder assembly is connected to the first sliding rod 10 through torsion spring 22. When the handle 6 is rotated, the torsion spring 22 begins to store force. The owner inserts the key from the lock hole 4 into the key hole 3, turns the key to unlock, and then can push open the fire door.

[0037] After the door opening action is completed, the key is pulled out and the handle 6 is released. The torsion spring 22 releases its stored force, driving the handle 6 (and the first rotating cylinder 5) to rotate in the opposite direction in the circumferential direction, causing the cover plate 7 to move back above the lock hole 4 and restore the cover of the lock hole 4. After the handle 6 is reset under the action of the torsion spring 22, the owner slides the handle 6 outward to reset it in the axial direction, and the second inclined block 18 separates from the first inclined block 17.

[0038] The compressed spring releases energy, pushing the second sliding rod 14 and the limiting rod 13 to move upward. The side wall of the limiting rod 13 abuts against the cover plate 7 again, cooperating with the locking block 20 to form a bidirectional limit, fixing the position of the cover plate 7. The wedge block 12 disengages from the wedge groove 11, the handle 6 returns to its initial state, the lock hole 4 is completely blocked, and the anti-theft function is restored.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealed steel fire door, comprising a fire door body (1), characterized in that: The fire door body (1) is provided with a door locking module; the door locking module includes a locking box (2), and a lock cylinder assembly and a sealing assembly are provided inside the locking box (2); the lock cylinder assembly is provided with a keyhole (3); the locking box (2) is provided with a lock hole (4) coaxial with the keyhole (3); the locking box (2) is rotatably connected to a first rotating cylinder (5), and the first rotating cylinder (5) is slidably connected to a handle (6); the sealing assembly includes a baffle plate (7) provided inside the locking box (2), a first through hole (8) is provided on the baffle plate (7), and a first fixing rod (9) inserted into the first through hole (8) is fixedly provided on the inner wall of the locking box (2); the handle (6) is provided with a first sliding rod (10), a wedge block (12) is provided on the first sliding rod (10), and a wedge groove (11) adapted to the wedge block (12) is provided on the baffle plate (7).

2. A sealed steel fire door according to claim 1, characterized in that: The locking box (2) is vertically slidably connected to a limiting rod (13) located on one side of the baffle plate (7), and a second sliding rod (14) is provided on the lower end face of the limiting rod (13).

3. A sealed steel fire door according to claim 2, characterized in that: The locking box (2) is provided with a second sliding cylinder (15) that is adapted to the second sliding rod (14), and a compression spring is provided between the lower end face of the second sliding rod (14) and the bottom wall of the second sliding cylinder (15).

4. A sealed steel fire door according to claim 2, characterized in that: The second sliding rod (14) is provided with a connecting part (16), and the connecting part (16) is provided with a first inclined block (17).

5. A sealed steel fire door according to claim 1, characterized in that: The first sliding rod (10) is provided with a second inclined block (18) that is adapted to the first inclined block (17), and the lower end surface of the second inclined block (18) is provided with an arc-shaped block (19).

6. A sealed steel fire door according to claim 2, characterized in that: A locking block (20) is fixedly installed on the other side of the inner baffle (7) of the locking box (2).

7. A sealed steel fire door according to claim 1, characterized in that: The lock cylinder assembly is rotatably connected to a second rotating cylinder (21), which is slidably connected to a first sliding rod (10).

8. A sealed steel fire door according to claim 7, characterized in that: A torsion spring (22) is provided between the second rotating cylinder (21) and the first sliding rod (10). One end of the torsion spring (22) is fixedly connected to the second rotating cylinder (21), and the other end of the torsion spring (22) is fixedly connected to the first sliding rod (10).

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