Fire door lock

Abstract

The present invention discloses a fire door top and bottom lock, wherein the main lock body comprises a lock box 1, a latch bolt mechanism and a driving mechanism, wherein the driving mechanism is connected to a lock core portion at the end face corresponding to the outside of the door and is connected to a handle portion 1 at the end face corresponding to the inside of the door; the upper push rod lock body comprises a lock box 2, an upper latch portion, a reset portion and a buckle box 1, the reset portion is connected to an upper push rod, the upper push rod is extended to be fixed in the control lock body, and the lower push rod lock body comprises a lock box 3, a lower latch portion, a push portion and a buckle box 2, the push portion is used to push the lower latch portion retracted in the lock box 3 to the outside of the lock box 3 and lock it with the buckle box 2, the push portion is connected to a lower push rod, the lower push rod is extended to be fixed in the control lock body. The present invention has the functions of fast locking and fast unlocking, and can realize the functions of unlocking the door by a key from outside and unlocking the door by a handle from inside in special places, thereby improving security performance while also improving the privacy of the place.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and more particularly to a fireproof door top and bottom lock. Background Art

[0002] A ceiling lock is commonly used on fire doors with two doors. It includes a main lock body and a secondary lock body. The secondary lock body includes an upper push rod lock and a lower push rod lock. The main lock body locks the two closed door leaves, while the upper push rod lock locks the upper door frame, and the lower push rod lock locks the lower base plate, ensuring stable door locking. Existing ceiling locks have the problem that the main lock body can be quickly unlocked by operating the handle from inside or outside the door, which cannot ensure privacy in special places such as classrooms and hospitals. After being unlocked, the upper and lower push rod locks cannot automatically reset and lock. In the event of an emergency, the door leaves cannot be quickly locked. In such an emergency, the indoor temperature and air pressure rise, and due to the poor locking effect of the lock, the indoor hot air flow can easily push the door leaves open, causing greater safety issues. These technical problems significantly reduce the safety performance of the lock, making it unable to meet the safety requirements of special occasions or special circumstances, resulting in low product quality of the ceiling lock. Therefore, the present application discloses a ceiling lock for fire doors with high safety performance, strong privacy, and fast locking. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a fire door ceiling lock with high safety performance, strong privacy, and the ability to quickly unlock and open.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a fire door top and bottom lock, comprising a main lock body and a secondary lock body, the secondary lock body comprising a control lock body and an upper push rod lock body and a lower push rod lock body located at both ends of the control lock body, the main lock body comprising a lock box, a latch bolt mechanism located within the lock box, and a drive mechanism, the drive mechanism being configured to drive the latch bolt mechanism to retract within the lock box, the drive mechanism being connected to a lock core portion at an end surface corresponding to the outside of the door and to a handle portion at an end surface corresponding to the inside of the door;

[0005] The lock body comprises a lock box second, an upper latch part located in the lock box second, a reset part and a buckle box first located outside the lock box second, the reset part is used to drive the upper latch part retracted in the lock box second to move to the outside of the lock box second and lock with the buckle box first, the reset part is connected to the upper push rod, the upper push rod extends to be fixed in the control lock body, the lower push rod lock body comprises a lock box third, a lower latch part located in the lock box third, a pushing part and a buckle box second located outside the lock box third, the pushing part is used to push the lower latch part retracted in the lock box third to the outside of the lock box third and lock with the buckle box second, the pushing part is connected to the lower push rod, the lower push rod extends to be fixed in the control lock body, the pushing part comprises a push plate slidably fitted on the inner wall of the lock box third, one end of the push plate is connected to the lower push rod, and the other end is connected to the lower latch part;

[0006] The control lock body includes a lock box four, a linkage device is provided in the lock box four, and the linkage device includes a rotating base, one end of the rotating base is located in the lock box four, and the other end extends to the outside of the lock box four, and the rotating base located outside the lock box four is matched with a handle part two, and the rotating base located in the lock box four is provided with a rotating part, and the rotating part includes a rotating piece and pull tabs located at both ends of the rotating piece, one end of the two pull tabs is located in the lock box four, and is provided with a fan-shaped hollow area, and a V-shaped groove is provided in the hollow area, and the end of the rotating piece is provided with a slider two that slides in the V-shaped groove, and the other ends of the two pull tabs extend to the outside of the lock box four and are respectively connected to the upper push rod and the lower push rod.

[0007] The present invention is further configured as follows: a reversing mechanism is also provided in the lock box 1, the reversing mechanism includes a reversing plate that slides up and down in the lock box 1, and a reset member that drives the reversing plate to move downward, the oblique tongue mechanism includes a connecting rod, a fixed plate sleeved on the connecting rod, and an oblique tongue block and a sliding seat at both ends of the connecting rod, wherein the fixed plate is fixed on the inner wall of the lock box 1, and the sliding seat is located on the inner wall of the lock box 1 and slides left and right, the driving mechanism includes a dial wheel, the dial wheel is connected to the sliding seat, and the reversing plate is driven by the reset member and is inserted between the sliding seat and the fixed plate.

[0008] The present invention is further configured as follows: the upper latch portion includes a latch head, a pull plate is provided between the upper push rod and the latch head, and a torsion spring 1 is provided on the pull plate, and the torsion spring 1 drives the pull plate to move toward the buckle box 1, so that the latch head moves to the outside of the lock box 2 and is inserted and fitted in the buckle box 1; the reset portion includes a reset roller and a reset paddle, and the reset roller is located in the lock box 2 and slides together, and a torsion spring 2 is provided at the tail end thereof, which is driven by the torsion spring 2 to move its end to the outside of the lock box 2 and is clamped and fitted in the buckle box 1, and the end of the reset paddle is sleeved on the rotating shaft and rotates and fits, and its end conflicts with the tail of the reset roller, and the tail of the reset paddle swings up and down, and a torsion spring 3 is also provided on the reset paddle, which drives the end of the reset paddle away from the rotating shaft to be lifted upward and conflict with the pull plate.

[0009] The present invention is further configured as follows: a resist block is provided on the pull plate, one end face of the resist block is in conflict with the reset paddle, and the other end face is in conflict with the end of the second torsion spring; a clamping block is provided on the reset paddle, and the third torsion spring is set on the rotating shaft, and its end is buckled on the clamping block; the reset paddle is also provided with a pressing inclined surface, and the tail of the reset roller is in conflict with the pressing inclined surface.

[0010] The present invention is further configured as follows: the reset roller includes a sliding frame and a ball, the sliding frame is provided with a slider 1, the bottom wall of the lock box 2 is provided with a sliding groove for sliding cooperation of the slider 1, the buckle box 1 is provided with a slot for inserting the pin head, and a bayonet for locking the ball.

[0011] The present invention is further configured as follows: the upper push rod and the lower push rod both include an assembly end and a coupling end, an adjusting threaded rod is provided between the assembly end and the coupling end, and the two ends of the adjusting threaded rod are respectively inserted into the assembly end and the coupling end and fixed with the internal threads.

[0012] The present invention is further configured as follows: the pull tab includes a plate and a connecting block extending to the outside of the lock box, the connecting block is provided with an assembly groove, and both side walls of the assembly groove are provided with insertion holes for screws to be inserted.

[0013] The present invention is further configured as follows: a sleeve is provided on the rotating piece, two protrusions are provided on the side wall of the sleeve, and slots adapted to the protrusions are provided on both sides of the rotating base.

[0014] By adopting the above technical solution, the present invention has the following advantages:

[0015] 1. The main lock body is controlled by the latch mechanism and can automatically lock after closing the door, which improves the locking efficiency of the main lock body. When unlocking, the door is unlocked by the handle inside and unlocked by the lock cylinder and key outside, which improves the privacy of special occasions.

[0016] 2. The upper push rod lock body and the lower push rod lock body can realize automatic reset and locking, which improves the locking efficiency;

[0017] 3. Improve the structure of the lock body to quickly retract the upper and lower push rods to quickly unlock the upper and lower push rod lock bodies.

[0018] 4. The overall lock has high structural strength when locked. It can not only lock the two doors, but also lock the upper and lower ends of one of the door leaves to prevent the door from being accidentally broken through in the event of an emergency, causing greater safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front view structure of the present invention;

[0020] Figure 2 This is a rear view structural diagram of the present invention;

[0021] Figure 3 Schematic diagram of the local structure of the main lock body Figure 1 ;

[0022] Figure 4 Schematic diagram of the local structure of the main lock body Figure 2 ;

[0023] Figure 5 The upper push rod lock structure state Figure 1 ;

[0024] Figure 6 The upper push rod lock structure state Figure 2 ;

[0025] Figure 7 This is an exploded view of the upper push rod lock structure;

[0026] Figure 8 Schematic diagram of the structure of the reset roller;

[0027] Figure 9 for Figure 2 Enlarged view of point a in the middle;

[0028] Figure 10 To control the lock body structure state Figure 1 ;

[0029] Figure 11 To control the lock body structure state Figure 2 ;

[0030] Figure 12 It is a schematic diagram of the local structure of the control lock body;

[0031] Figure 13 It is a structural diagram of the pull tab;

[0032] Figure 14This is a structural exploded view of the rotating piece and rotating base.

[0033] Main lock body; 10. Lock box 1; 11. Latch mechanism; 110. Connecting rod; 111. Fixed plate; 112. Latch block; 113. Sliding seat; 12. Drive mechanism; 121. Handle 1; 122. Dial wheel; 123. Reversing mechanism; 1230. Reversing plate; 1231. Reset element; 124. Lock core;

[0034] 2. Secondary lock body;

[0035] 3. Control lock body; 30. Lock box (four); 31. Rotating base; 310. Slot; 32. Handle (two); 33. Rotating portion; 330. Rotating piece; 331. Pull tab; 332. Hollow area; 333. V-shaped slide; 334. Plate; 335. Connecting block; 336. Assembly slot; 337. Socket; 338. Socket; 339. Protrusion; 340. Slider (two);

[0036] 4. Upper push rod lock body; 40. Lock box 2; 400. Slide; 41. Buckle box 1; 410. Slot; 411. Bayonet; 42. Upper latch; 420. Latch head; 421. Pull plate; 422. Torsion spring 1; 423. Stop block; 43. Reset unit; 430. Reset roller; 431. Reset paddle; 432. Torsion spring 2; 433. Torsion spring 3; 434. Stop block; 435. Pressing ramp; 436. Rotating shaft; 437. Sliding frame; 438. Ball bearing; 439. Slider 1; 44. Upper push rod; 440. Assembly end; 441. Coupling end; 442. Adjusting threaded rod;

[0037] 5. Lower push rod lock body; 50. Lock box three; 51. Lower latch part; 52. Push part; 520. Lower push rod; 521. Push plate; 53. Lock box two. DETAILED DESCRIPTION

[0038] Reference Figures 1 to 14 The embodiments of the present invention are further described. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification, so that people familiar with this technology can understand and read them. They are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0039] A fire door top and bottom lock, comprising a main lock body 1 and a secondary lock body 2. The secondary lock body 2 comprises a control lock body 3 and an upper push rod lock body 4 and a lower push rod lock body 5 located at both ends of the control lock body 3. The main lock body 1 comprises a lock box 10, a latch bolt mechanism 11 located within the lock box 10, and a drive mechanism 12. The drive mechanism 12 is used to drive the latch bolt mechanism 11 to retract within the lock box 10. The drive mechanism 12 is connected to a lock core portion 124 on the end surface corresponding to the outside of the door and to a handle portion 121 on the end surface corresponding to the inside of the door.

[0040] A reversing mechanism 123 is also provided in the lock box 10, and the reversing mechanism 123 includes a reversing plate 1230 that slides up and down in the lock box 10, and a reset member 1231 that drives the reversing plate 1230 to move downward. The inclined tongue mechanism 11 includes a connecting rod 110, a fixed plate 111 sleeved on the connecting rod 110, and an inclined tongue block 112 and a sliding seat 113 located at both ends of the connecting rod 110, wherein the fixed plate 111 is fixed on the inner wall of the lock box 10, and the sliding seat 113 is located on the inner wall of the lock box 10 and slides left and right. The driving mechanism 12 includes a dial 122, which is connected to the sliding seat 113. The reversing plate 1230 is driven by the reset member 1231 and is inserted between the sliding seat 113 and the fixed plate 111.

[0041] In conjunction with the instructions Figures 1 to 4 The main lock body 1 is provided with a latch bolt mechanism 11. A retractable latch bolt 112 slides out of the lock box 10, enabling automatic and rapid locking of the door leaf for convenient operation. To unlock, a key is inserted into the lock core 124 from outside the door, driving the thumbwheel 122 to rotate. Inside the door, the thumbwheel 122 is rotated by turning the handle 121. The thumbwheel 122 drives the sliding seat 113 in the opposite direction of the latch bolt 112, driving the connecting rod 110 to retract the latch bolt 112 into the lock box 10, achieving rapid unlocking. By moving the reversing plate 1230 upward, the latch bolt 112 can be fully slid out of the lock box 10. The reversing plate 1230 is then reset by a reset element 1231, a torsion spring. By rotating the latch bolt 112, the direction of the inclined surface of the latch bolt 112 changes, adapting to locking doors arranged in different directions. After the reversal adjustment is complete, the latch block 112 is pushed toward the interior of the lock box 10, causing the reversing plate 1230 to move between the sliding seat 113 and the fixed plate 111, thereby positioning the latch mechanism 11 for proper operation. The above improvements enable the main lock body 1 to be unlocked from outside the door using a key and from inside the door using the handle 121, enhancing security while maintaining privacy.

[0042] The upper push rod lock body 4 includes a lock box 2 40, an upper latch portion 42 located in the lock box 2 40, a reset portion 43 and a buckle box 1 41 located outside the lock box 2 40, the reset portion 43 is used to drive the upper latch portion 42 retracted in the lock box 2 40 to move to the outside of the lock box 2 40 and lock with the buckle box 1 41, the reset portion 43 is connected to an upper push rod 44, the upper push rod 44 extends to the control lock body 3 and is fixed, the lower push rod lock body 5 includes a lock box 3 50, a lower latch portion 51 located in the lock box 3 50, a pushing portion 52, and a buckle box 2 53 located outside the lock box 3 50, the pushing portion 52 is used to push the lower latch portion 51 retracted in the lock box 3 50 to the outside of the lock box 3 50 and lock with the buckle box 2 53, the pushing portion 52 is connected to a lower push rod 520, and the lower push rod 520 extends to the control lock body 3 and is fixed. The upper latch portion 42 includes a latch head 420, a pull plate 421 is provided between the upper push rod 44 and the latch head 420, and a torsion spring 422 is provided on the pull plate 421. The torsion spring 422 drives the pull plate 421 to move toward the buckle box 1 41, so that the latch head 420 moves to the outside of the lock box 2 40 and is inserted into the buckle box 1 41. The reset portion 43 includes a reset roller 430 and a reset paddle 431. The reset roller 430 is located in the lock box 2 40 and is slidably matched. A torsion spring is provided at its tail. The second 432 is driven by the second torsion spring 432 to move its end to the outside of the lock box 2 40 and is locked in the buckle box 1 41. The end of the reset paddle 431 is sleeved on the rotating shaft 436 and rotated, and its end contacts the tail of the reset roller 430. The tail of the reset paddle 431 swings up and down. The reset paddle 431 is also provided with a third torsion spring 433. The third torsion spring 433 drives the reset paddle 431 to lift up the end away from the rotating shaft 436 and contact the pull plate 421. The pull plate 421 is provided with a stopper 423, one end of which contacts the reset paddle 431, and the other end of which contacts the end of the second torsion spring 432. The reset paddle 431 is provided with a locking block 434. The third torsion spring 433 is sleeved on the rotating shaft 436, with its end engaging the locking block 434. The reset paddle 431 is also provided with a pressing inclined surface 435, and the tail of the reset roller 430 contacts the pressing inclined surface 435. The reset roller 430 includes a sliding frame 437 and a ball bearing 438. The sliding frame 437 is provided with a slider 1 439. The bottom wall of the second lock box 40 is provided with a sliding groove 400 for the sliding engagement of the slider 1 439. The first lock box 41 is provided with a slot 410 for the latch head 420 to be inserted into, and a latching hole 411 for the ball bearing 438 to be engaged. The pushing portion 52 includes a push plate 521 that is slidably fitted on the inner wall of the lock box 3 50 . One end of the push plate 521 is connected to the lower push rod 520 , and the other end is connected to the lower latch portion 51 .The upper push rod 44 and the lower push rod 520 both include an assembly end 440 and a coupling end 441. An adjusting threaded rod 442 is provided between the assembly end 440 and the coupling end 441. The two ends of the adjusting threaded rod 442 are respectively inserted into the assembly end 440 and the coupling end 441 and fixed by internal threads.

[0043] In conjunction with the instructions Figures 5 to 9 The operating principle of the upper push rod lock body 4: the buckle box 1 41 is installed at the upper end of the door frame. When the door is opened and unlocked, the lock body 3 is controlled by operation to drive the upper push rod 44 to move downward, thereby driving the pull plate 421 to move, and the pull plate 421 drives the pin head 420 to retract into the lock box 2 40 to achieve unlocking. When the door panel is closed, the ball 438 touches the lock box 1 41. The ball 438 is squeezed by the lock box 1 41 and moves the sliding frame 437 toward the lock box 2 40. When the reset roller 430 moves, it contacts the pressing inclined surface 435 on the reset paddle 431. After the reset paddle 431 is pressed, the end away from the rotating shaft 436 swings downward. Due to the displacement of the reset paddle 431, the position of the pull plate 421 is no longer restricted. Driven by the torsion spring 1 422, the pull plate 421 moves toward the lock box 1 41. The pull plate 421 pushes the latch head 420 out of the lock box and inserts it into the slot 410 of the lock box, realizing automatic reset and locking. In the event of danger, the fire door can be locked in time, which is beneficial to improving the safety performance of the lock. The operating principle of the lower push rod lock 5 is as follows: when unlocking, the lower push rod 520 drives the push plate 521 to move, causing the lower latch portion 51 to retract and lock into the lock box 3 50 to unlock. When closing, the lower push rod 520 is no longer forced to move upward, and the lower latch portion 51 moves out of the lock box 3 50 under the action of its own gravity and cooperates with the second buckle.

[0044] The control lock body 3 includes a lock box 4 30, and a linkage device is provided in the lock box 4 30. The linkage device includes a rotating base 31, one end of the rotating base 31 is located in the lock box 4 30, and the other end extends to the outside of the lock box 4 30. The rotating base 31 located outside the lock box 4 30 is equipped with a handle part 2 32, and the rotating base 31 located in the lock box 4 30 is provided with a rotating part 33. The rotating part 33 includes a rotating piece 330 and pull tabs 331 located at both ends of the rotating piece 330. One end of the two pull tabs 331 is located in the lock box 4 30 and is provided with a fan-shaped hollow area 332. The hollow area 332 has a V-shaped groove 333. The end of the rotating piece 330 is provided with a slider 2 340 that slides in the V-shaped groove 333. The other end of the two pull tabs 331 extends to the outside of the lock box 4 30 and is connected to the upper push rod 44 and the lower push rod 520 respectively. The pull tab 331 includes a plate 334 and a connecting block 335 extending outside the lock box 29 30. The connecting block 335 is provided with a mounting slot 336, and the side walls of the mounting slot 336 are provided with screw insertion holes 337. The rotating plate 330 is provided with a socket 338, and the side walls of the socket 338 are provided with two protrusions 339. The rotating base 31 is provided with slots 310 on both sides that match the protrusions 339.

[0045] In conjunction with the instructions Figures 10 to 14 When the secondary lock body 2 is unlocked, the handle portion 32 is rotated to drive the rotating base 31 to move, and the rotating base 31 drives the rotating piece 330 to move. During the rotation of the rotating piece 330, the slider moves along the V-shaped groove 333 on the pull piece 331 (see the appendix of the manual). Figure 11 ( ) At this point, the pull tab 331 moves toward the rotating base 31, causing both the upper push rod 44 and the lower push rod 520 to retract into the lock box 4 30, achieving a quick unlocking state where the latch head 420 disengages the buckle box 1 41 and the lower latch portion 51 disengages the buckle 2. After the rotating handle 2 32 returns to its original position, it also drives the rotating tab 330 back to its original position. Due to the hollow area 332, the reset of the rotating tab 330 does not affect the position of the pull tab 331. The pull tab 331 is reset by the automatic locking of the upper push rod lock body 4 and the lower push rod lock body 5. This structural improvement reduces the number of hinge points on the control mechanism, making it operate more smoothly and stably, improving unlocking efficiency, and thus enhancing the overall operating quality of the lock.

[0046] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A fire door top and bottom lock, comprising a main lock body and a secondary lock body, wherein the secondary lock body comprises a control lock body and an upper push rod lock body and a lower push rod lock body located at both ends of the control lock body, characterized in that: The main lock body includes a lock box 1, a latch bolt mechanism located in the lock box 1, and a driving mechanism, wherein the driving mechanism is used to drive the latch bolt mechanism to retract into the lock box 1. The end surface of the driving mechanism corresponding to the outside of the door is connected to a lock core portion, and the end surface corresponding to the inside of the door is connected to a handle portion 1; The lock body comprises a lock box second, an upper latch part located in the lock box second, a reset part and a buckle box first located outside the lock box second, the reset part is used to drive the upper latch part retracted in the lock box second to move to the outside of the lock box second and lock with the buckle box first, the reset part is connected to the upper push rod, the upper push rod extends to be fixed in the control lock body, the lower push rod lock body comprises a lock box third, a lower latch part located in the lock box third, a pushing part and a buckle box second located outside the lock box third, the pushing part is used to push the lower latch part retracted in the lock box third to the outside of the lock box third and lock with the buckle box second, the pushing part is connected to the lower push rod, the lower push rod extends to be fixed in the control lock body, the pushing part comprises a push plate slidably fitted on the inner wall of the lock box third, one end of the push plate is connected to the lower push rod, and the other end is connected to the lower latch part; The control lock body includes a lock box four, a linkage device is provided in the lock box four, and the linkage device includes a rotating base, one end of the rotating base is located in the lock box four, and the other end extends to the outside of the lock box four, and the rotating base located outside the lock box four is matched with a handle part two, and the rotating base located in the lock box four is provided with a rotating part, and the rotating part includes a rotating piece and pull tabs located at both ends of the rotating piece, one end of the two pull tabs is located in the lock box four, and is provided with a fan-shaped hollow area, and a V-shaped groove is provided in the hollow area, and the end of the rotating piece is provided with a slider two that slides in the V-shaped groove, and the other ends of the two pull tabs extend to the outside of the lock box four and are respectively connected to the upper push rod and the lower push rod.

2. A fire door top and bottom lock according to claim 1, characterized in that: A reversing mechanism is also provided in the lock box 1, and the reversing mechanism includes a reversing plate that slides up and down in the lock box 1, and a reset member that drives the reversing plate to move downward. The oblique tongue mechanism includes a connecting rod, a fixed plate sleeved on the connecting rod, and an oblique tongue block and a sliding seat at both ends of the connecting rod, wherein the fixed plate is fixed on the inner wall of the lock box 1, and the sliding seat is located on the inner wall of the lock box 1 and slides left and right. The driving mechanism includes a dial wheel, which is connected to the sliding seat. The reversing plate is driven by the reset member and is inserted between the sliding seat and the fixed plate.

3. The fire door top and bottom lock according to claim 1, characterized in that: The upper latch portion includes a latch head, a pull plate is provided between the upper push rod and the latch head, and a torsion spring 1 is provided on the pull plate. The torsion spring 1 drives the pull plate to move toward the buckle box 1, so that the latch head moves to the outside of the lock box 2 and is inserted and fitted in the buckle box 1. The reset portion includes a reset roller and a reset paddle. The reset roller is located in the lock box 2 and is slidably fitted. A torsion spring 2 is provided at the tail end thereof, which drives the torsion spring 2 to move its end to the outside of the lock box 2 and is clamped and fitted in the buckle box 1. The end of the reset paddle is sleeved on the rotating shaft and rotates, and its end contacts the tail of the reset roller. The tail of the reset paddle swings up and down, and a torsion spring 3 is also provided on the reset paddle, which drives the end of the reset paddle away from the rotating shaft to be lifted upward and contact the pull plate.

4. A fire door top and bottom lock according to claim 3, characterized in that: The pull plate is provided with a resist block, one end face of the resist block is in conflict with the reset paddle, and the other end face is in conflict with the end of the second torsion spring. The reset paddle is provided with a clamping block, and the third torsion spring is set on the rotating shaft, and its end is buckled on the clamping block. The reset paddle is also provided with a pressing inclined surface, and the tail of the reset roller is in conflict with the pressing inclined surface.

5. A fire door top and bottom lock according to claim 4, characterized in that: The reset roller includes a sliding frame and a ball bearing. The sliding frame is provided with a slider 1, the bottom wall of the lock box 2 is provided with a sliding groove for the slider 1 to slide with, and the buckle box 1 is provided with a slot for the pin head to be inserted and a bayonet for the ball bearing to be locked.

6. The fire door top and bottom lock according to claim 1, characterized in that: The upper push rod and the lower push rod both include an assembly end and a coupling end. An adjusting threaded rod is provided between the assembly end and the coupling end. The two ends of the adjusting threaded rod are respectively inserted into the assembly end and the coupling end and fixed with internal threads.

7. The fire door top and bottom lock according to claim 1, characterized in that: The pull tab comprises a plate and a connecting block extending to the outside of the lock box. The connecting block is provided with an assembly groove, and both side walls of the assembly groove are provided with insertion holes for screws to be inserted.

8. The fire door top and bottom lock according to claim 7, characterized in that: The rotating piece is provided with a sleeve, the side wall of the sleeve is provided with two protrusions, and both sides of the rotating base are provided with card slots adapted to the protrusions.

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