A concealed door lock

Abstract

The application relates to a hidden door lock and relates to the field of lock equipment, which comprises a fireproof door, the fireproof door is of a hollow structure, a lock body is arranged on the fireproof door, a pressure rod is rotationally connected to the lock body, a driving mechanism is arranged on one side wall of the fireproof door, a side wall of the fireproof door is provided with a let-in groove, one end of the pressure rod away from the driving mechanism penetrates through the let-in groove, a main lock is arranged in the fireproof door lock, one end of the pressure rod penetrates through the let-in groove and abuts against the main lock, connecting rods are connected to two ends of the main lock, one end of one group of the connecting rods away from the main lock is connected with an upper lock, one end of the other group of the connecting rods away from the main lock is connected with a lower lock, and the connecting rods, the upper lock and the lower lock are arranged in the fireproof door; the application has the beneficial effects that the occupied space of the fireproof door lock can be reduced, and the convenience and the aesthetic appearance during use of the fireproof door lock are improved.

Description

Technical Field

[0001] The present application relates to the field of lock devices, and in particular to a concealed door lock. Background Art

[0002] A fire door lock is a lock used on fireproof doors. When a fire breaks out inside the door, the fire door lock locks the door tightly to prevent the spread of the fire. Fire door locks generally include push-type and push-down types.

[0003] The related prior art discloses a fireproof door lock, comprising an upper lock body and a lower lock body; the lower lock body comprises a lower lock shell and a lower lock rod connected to the lower lock shell in a sliding manner along the upper and lower directions; the upper lock body comprises an upper lock shell, a card plate, a sliding rod connected to the upper lock shell in a sliding direction along the upper and lower directions, an upper lock tongue rotatably connected to the upper lock shell, a clamping piece connected to the upper lock tongue, and a limit piece located between the clamping piece and the sliding rod; the limit piece is connected to the sliding rod; the upper lock tongue can drive the clamping piece to rotate to the bottom of the limit piece; the upper end wall of the upper lock tongue is provided with a clamping groove for clamping with the card plate; an intermediate lock shell is provided between the sliding rod and the lower lock rod, and the intermediate lock shell is provided with a sliding rod sliding along the upper and lower directions, and a connecting rod is connected between the sliding rod and the sliding rod, and between the sliding rod and the lower lock rod; the intermediate lock shell is provided with a driving device for driving the sliding rod to slide upward. The door lock is installed on the upper surface of the fire door. When the door is closed, the card plate abuts against the lock tongue, causing the lock tongue to rotate, thereby causing the card reference to disengage from the limit piece, and the sliding rod slides downward, thereby causing the limit piece to support the clamping piece, so that the card plate and the clamping groove are stably matched, and at the same time, the lower locking rod is inserted into the corresponding lock hole on the ground, thereby locking the door body; when opening the door, the flat push rod is pressed, and the flat push rod drives the toggle rod to rotate, driving the cam to push the sliding rod upward, and the sliding rod drives the sliding rod to slide upward through the connecting rod, so that the limit piece is disengaged from the clamping piece, and at the same time, the lower locking rod is disengaged from the corresponding lock hole. At this time, the door body is rotated, and the upper lock tongue rotates accordingly, so that the clamping piece abuts against the lower side of the limit piece to limit the downward movement of the limit piece, so that the sliding rod and the lower locking rod are fixed, and the door is opened.

[0004] Regarding the related technologies mentioned above, the fire door lock installed and manufactured by this method, in order to facilitate the connection between the toggle rod and the drive cam, the drive cam, the sliding rod and the connecting rod are all arranged on the surface of the fire door, resulting in the fire door lock and the fire door occupying a large space and poor aesthetics. Summary of the Invention

[0005] In order to reduce the space occupied by fireproof door locks and improve the convenience and aesthetics of fireproof door locks when used, the present application provides a hidden door lock.

[0006] The present application provides a concealed door lock adopting the following technical solution:

[0007] The fireproof door lock is a kind of hidden door lock, comprising a fireproof door, the fireproof door having a hollow structure, the fireproof door being provided with a lock body, the lock body being rotatably connected to a pressure rod, and a driving mechanism being provided on one side wall of the fireproof door, the driving mechanism being used to drive the pressure rod to rotate, the side wall of the fireproof door being provided with a give way groove, the pressure rod one end away from the driving mechanism passing through the give way groove, a main lock device being provided in the fireproof door lock, one end of the pressure rod passing through the give way groove and abutting against the main lock device, both ends of the main lock device are connected to connecting rods, one group of the connecting rods is connected to an upper lock device at one end away from the main lock, and the other group of the connecting rods is connected to a lower lock device at one end away from the main lock, and the connecting rod, the upper lock device and the lower lock device are all arranged in the fireproof door.

[0008] By adopting the above technical solution, by setting the fire door into a hollow structure, the main lock, upper lock and lower lock can be set inside the fire door, thereby reducing the space occupied by the door lock, so that only the driving mechanism can be seen on the outside of the fire door. It is convenient and quick to operate and is not prone to accidental touch. The driving mechanism drives the upper lock and lower lock through the connecting rod to realize the opening, closing and locking of the fire door. The structure is simple and stable, not prone to damage, and has a long service life.

[0009] Optionally, a first mounting hole and a second mounting hole are provided on the lock body, the distance between the first mounting hole and the main lock is smaller than the distance between the second mounting hole and the main lock, a mounting shaft is provided on the pressure rod, the pressure rod is rotatably connected to the lock body via the mounting shaft, and the mounting shaft can be inserted into the first mounting hole or the second mounting hole.

[0010] By adopting the above technical solution, by installing the mounting shaft between the first mounting hole or the second mounting hole at different positions, the positional relationship between the end of the pressure rod and the main lock can be adjusted, so that the distance between the pressure rod and the main lock can be adjusted to adapt to fire doors of different specifications and thicknesses. There is no need to manufacture pressure rods of different lengths and specifications, which can improve the adaptability of fire door locks and save production costs.

[0011] Optionally, the driving mechanism includes a driving support, a push rod, a tilting rod and a first elastic reset member, the driving support is connected to the fire door, the push rod is slidably connected to the driving support, the tilting rod is rotatably connected to the driving support, the first elastic reset member is located between the push rod and the fire door, one end of the tilting rod abuts against the push rod, and the other end abuts against the pressure rod.

[0012] By adopting the above technical solution, by pressing the push rod, the push rod abuts and drives the tilt rod to rotate while squeezing the first elastic reset button, so that the end of the tilt rod drives the pressure rod to rotate, thereby realizing the driving of the main lock by the pressure rod, and the fire door lock can be opened. After releasing the push rod, the first elastic reset part releases the elastic potential energy, so that the push rod is reset, which is convenient for the next operation. There is no need to manually reset the push rod, and the operation is convenient and quick.

[0013] Optionally, the main lock includes a lock shell, a rotating frame, an upper locking rod, a lower locking rod, a first connecting rod and a second connecting rod, the lock shell is connected to the inside of the fire door, the rotating frame is rotatably connected to the lock shell, the upper locking rod is slidably connected to the lock shell, one end of the upper locking rod is connected to the rotating frame through the first connecting rod, and the other end is connected to one group of the connecting rods, the lower locking rod is slidably connected to the lock shell, one end of the lower locking rod is connected to the rotating frame through the second connecting rod, and the other end is connected to one group of the connecting rods, a second elastic return member is connected to the rotating frame, and the second elastic return member is connected to the lock shell at one end away from the rotating frame.

[0014] By adopting the above technical solution, after the pressure rod abuts and squeezes the rotating frame, the rotating frame rotates, driving the upper locking rod and the lower locking rod to slide on the lock shell respectively, and the upper locking rod and the lower locking rod respectively drive the corresponding connecting rods, thereby realizing the driving of the upper lock and the lower lock, and the consistency of the upper lock and the lower lock can be achieved, making it smoother when unlocking and opening the door and less likely to get stuck.

[0015] Optionally, an abutment shaft is provided on the rotating frame, a rotating sleeve is rotatably connected to the abutment shaft, and one end of the pressure rod away from the driving mechanism abuts against a peripheral wall of the rotating sleeve.

[0016] By adopting the above technical solution, a rotating sleeve with a rotatable connection is provided on the abutment shaft, so that the sliding friction between the pressure rod and the abutment shaft when driving the rotating frame is converted into rolling friction, thereby reducing the occurrence of jamming between the pressure rod and the abutment shaft, and improving the smoothness of the rotation of the rotating frame driven by the pressure rod, which is beneficial to improving the unlocking and locking speed of the fire door, and reducing the phenomenon that the fire door cannot be used normally due to malfunction of the fire door lock.

[0017] Optionally, the upper lock device includes an upper shell, an upper lock tongue and a connecting plate, the upper shell is connected to the inside of the fire door, the connecting plate is connected to the upper shell, the connecting rod passes through the upper shell, the upper lock tongue is connected to the end of the connecting rod away from the main lock device, an upper lock hole is provided at the top of the fire door, the upper lock tongue is inserted into the upper lock hole, a guide groove is provided on the upper lock tongue, a guide block is provided on the connecting plate, the guide block is inserted in the guide groove, and a locking mechanism is also provided on the upper shell, and the locking mechanism is used to realize the locking of the upper lock tongue.

[0018] By adopting the above technical solution, after the connecting rod is driven by the main lock, the connecting rod drives the upper lock tongue to move together, so that the upper lock tongue can extend or retract from the upper lock hole, thereby realizing the unlocking and locking of the upper end of the fire door. The setting of the guide groove and the guide block can improve the stability of the upper lock tongue and reduce the phenomenon of rotational deviation of the upper lock tongue.

[0019] Optionally, the locking mechanism includes a connecting frame, a contact column and a third elastic reset member, the connecting frame is rotatably connected to the upper shell and a limiting protrusion is provided on one side of the connecting frame, the peripheral wall of the upper lock tongue is provided with a limiting groove, the limiting protrusion can be inserted into the limiting groove, the contact column is connected to the connecting frame, the side wall of the fire door is provided with an avoidance groove, the end of the contact column away from the connecting frame passes through the avoidance groove, the third elastic reset member is provided between the connecting frame and the upper shell, and the third elastic reset member is used to provide a force to disengage the limiting protrusion from the limiting groove.

[0020] By adopting the above technical solution, when the door is closed and locked, the contact column is abutted by the door frame, driving the connecting frame to rotate, so that the limiting protrusion disengages from the limiting groove, and the upper lock tongue extends out of the upper lock hole. When unlocking is required, the pressure rod drives the main lock device, and the main lock device drives the connecting rod to slide, so that the upper lock tongue retracts into the upper lock hole. At this time, under the action of the third elastic reset member, the limiting protrusion is inserted into the limiting groove, thereby realizing the locking of the upper lock tongue and preventing the upper lock tongue from extending out of the upper lock hole.

[0021] Optionally, the lower lock includes a lower lock tongue, wherein a connecting groove is provided at one end of a group of connecting rods away from the main lock, the lower lock tongue is inserted into the connecting groove, a lower lock hole is provided on the fire door, and the lower lock tongue passes through the lower lock hole.

[0022] By adopting the above technical solution, the lower lock tongue is connected to the connecting rod through the connecting groove. When the main lock drives the connecting rod to slide, the connecting rod drives the lower lock tongue to extend out of the lower lock hole or the upper lock hole, thereby realizing the unlocking and locking of the lower end of the fire door. The operation is convenient and fast, and the structure is simple and stable.

[0023] Optionally, the lower lock tongue further includes a latch, an adjustment hole is provided on the connecting rod where the lower lock tongue is located, and a plurality of adjustment slots are provided on the lower lock tongue, and the latch is inserted into the adjustment hole and into one group of the adjustment slots.

[0024] By adopting the above technical solution, by inserting the pin into different adjustment slots on the lower lock tongue, the length by which the lower lock tongue can extend out of the fire door can be adjusted to adapt to the usage requirements of different places. There is no need to manufacture lower lock tongues of different lengths and specifications. The operation is convenient and quick, and production costs can be saved.

[0025] Optionally, a flexible pad is provided at one end of the lower locking tongue away from the connecting rod.

[0026] By adopting the above technical solution, the setting of the flexible pad can convert the rigid contact between the lower lock tongue and the ground into flexible contact, thereby reducing the mutual wear between the lower lock tongue and the ground, which is beneficial to improving the service life of the lower lock tongue and can also reduce the phenomenon of scratches on the ground when the lower lock tongue is used, and has good aesthetics.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By setting the fire door into a hollow form, the main lock, upper lock and lower lock of the fire door lock can be set inside the fire door. The end of the pressure rod can be driven by the abutment with the main lock through the give way groove. Under the premise of not affecting the locking and unlocking functions of the fire door lock, the space occupied by the fire door lock can be reduced, the appearance is good, and the phenomenon of fire door lock being damaged by collision due to exposure can be reduced, thereby increasing the service life of the fire door lock.

[0029] 2. By rotating the rotating frame to connect it to the lock shell, and connecting the upper lock and the lower lock to the rotating frame through a connecting rod, the upper lock and the lower lock can be synchronously driven by the rotating frame. With a simple structure and high stability, the consistency of locking and unlocking of the upper lock and the lower lock can be achieved, which improves the smoothness of the fire door lock when in use and reduces the phenomenon that the fire door lock cannot be opened and closed normally due to inconsistency between the upper lock and the lower lock when they are controlled separately.

[0030] 3. The setting of the locking mechanism can achieve that when the door is opened, the limiting protrusion is inserted into the limiting groove through the action of the third elastic reset member, so that the upper lock tongue is always in the state of retracting into the upper lock hole. When closing the door, there is no need to manually press the push rod to keep the upper lock tongue in the retracted state. After the door is closed, the contact column is squeezed, the limiting protrusion is disengaged from the limiting groove, and the upper lock tongue can extend out of the upper lock hole to realize locking of the upper end of the fire door, which is convenient and quick to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is an overall schematic diagram of the hidden door lock according to an embodiment of the present application.

[0032] Figure 2 This is an exploded diagram of the internal structure of a fire door.

[0033] Figure 3 It is a schematic diagram showing part of the structure of the main lock.

[0034] Figure 4 It is a structural diagram showing the upper lock and locking mechanism.

[0035] Explanation of reference numerals: 1, fire door; 2, lock body; 3, pressure rod; 4, driving mechanism; 401, driving support; 402, push rod; 403, tilting rod; 404, first elastic return member; 5, clearance groove; 6, main lock; 601, lock housing; 602, rotating frame; 603, upper locking rod; 604, lower locking rod; 605, first connecting rod; 606, second connecting rod; 7, connecting rod; 8, upper lock; 801, upper housing; 802, upper lock tongue; 80 3. Connecting plate; 9. Lower lock; 901. Lower lock tongue; 902. Latch; 10. First mounting hole; 11. Second mounting hole; 12. Mounting shaft; 13. Abutting shaft; 14. Rotating sleeve; 15. Guide groove; 16. Guide block; 17. Locking mechanism; 1701. Connecting frame; 1702. Contact column; 1703. Third elastic reset member; 18. Limiting protrusion; 19. Limiting groove; 20. Adjusting hole; 21. Adjusting groove; 22. Flexible pad. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The embodiment of the present application discloses a hidden door lock. Figure 1 and Figure 2The hidden door lock includes a fire door 1. The fire door 1 is a hollow structure. A lock body 2 is installed on the outer wall of the fire door 1. A pressure rod 3 is rotatably connected to the lock body 2. A first mounting hole 10 and a second mounting hole 11 are opened on the lock body 2. The distance between the first mounting hole 10 and the side wall of the fire door 1 is smaller than the distance between the second mounting hole 11 and the side wall of the fire door 1. A mounting shaft 12 is integrally formed on the pressure rod 3. The mounting shaft 12 can be inserted and installed in the first mounting hole 10 or the second mounting hole 11 to realize the rotational connection between the pressure rod 3 and the lock body 2. The position adjustment of the pressure rod 3 is realized by adjusting the installation position of the mounting shaft 12 to adapt to fire doors 1 of different thickness specifications in turn; the fire door 1 is installed on the same side of the lock body 2 with a The driving mechanism 4 is used to drive the pressure rod 3 to rotate. The driving mechanism 4 includes a driving support 401, a push rod 402, a tilting rod 403 and a first elastic return member 404. The driving support 401 is welded to the fire door 1, and the push rod 402 is slidingly connected to the driving support 401. One end of the first elastic return member 404 abuts against the push rod 402, and the other end abuts against the side wall of the fire door 1, and the first elastic return member 404 is always in a compressed state. The first elastic return member 404 of this embodiment can be a spring, and the tilting rod 403 is rotatably connected to one end of the driving support 401 close to the lock body 2, and one end of the tilting rod 403 abuts against the push rod 402, and the other end abuts against the pressure rod 3. The rotation of the tilting rod 403 can drive the pressure rod 3 to rotate together.

[0038] Reference Figure 1 、 Figure 2 and Figure 3The fire door 1 is provided with a give way slot 5 on one side near the lock body 2, and a main lock 6 is installed near the give way slot 5 inside the fire door 1. One end of the pressure rod 3 passes through the give way slot 5 and abuts against the main lock 6. The rotation of the pressure rod 3 can drive the main lock 6 to work. Both ends of the main lock 6 are connected with connecting rods 7. One group of connecting rods 7 is provided with an upper lock 8 at one end away from the main lock 6, and the upper lock 8 is located at the upper end inside the fire door 1, and the other group of connecting rods 7 is provided with a lower lock 9 at one end away from the main lock 6, and the lower lock 9 is displaced to the lower end inside the fire door 1; the main lock 6 includes a lock shell 601, a rotating frame 602, an upper locking rod 603, a lower locking rod 604, a first connecting rod 605 and a second connecting rod 606. The lock shell 601 is installed on the inner wall of the fire door 1. The movable frame 602 is rotatably connected to the lock housing 601, and an abutment shaft 13 is provided on the side of the rotating frame 602 facing the yield groove 5, and a rotating sleeve 14 is rotatably connected to the abutment shaft 13, and the end of the pressure rod 3 away from the push rod 402 abuts against the peripheral wall of the rotating sleeve 14, one end of the rotating frame 602 is connected to the upper locking rod 603 through the first connecting rod 605, and the upper locking rod 603 is slidably connected to the lock housing 601, and the other end of the rotating frame 602 is connected to the lower locking rod 604 through the second connecting rod 606, and the lower locking rod 604 is slidably connected to the lock housing 601, and the end of the rotating frame 602 close to the second connecting rod 606 is connected to the second elastic return member, and the end of the second elastic return member away from the rotating frame 602 is connected to the lock housing 601. The second elastic return member in this embodiment can be a tension spring.

[0039] Reference Figure 3 and Figure 4, the upper lock 8 includes an upper shell 801, an upper lock tongue 802 and a connecting plate 803, the upper shell 801 is installed in the fire door 1, the connecting plate 803 is welded to the upper shell 801, the upper lock tongue 802 is slidably connected to the connecting plate 803, and a guide block 16 is integrally formed on the connecting plate 803. A guide groove 15 is provided on the upper lock tongue 802, and the guide block 16 is inserted into the guide groove 15. The length direction of the guide groove 15 is consistent with the sliding direction of the upper lock tongue 802. The end of the connecting rod 7 corresponding to the upper lock tongue 802 away from the upper locking rod 603 passes through the upper shell 801 and is connected to the upper lock tongue 802; a locking mechanism 17 is also provided on the upper shell 801, and the locking mechanism 17 is used to fix the position of the upper lock tongue 802. The locking mechanism 17 includes a connecting frame 1 701, contact column 1702 and third elastic return member 1703, the connecting frame 1701 is rotatably connected to the upper shell 801, a limiting protrusion 18 is integrally formed on one side of the connecting rod 7, and a limiting groove 19 is provided on the peripheral wall of the upper lock tongue 802, and the limiting protrusion 18 can be inserted into the limiting groove 19, the contact column 1702 is welded to the connecting frame 1701, and an avoidance groove is provided on the side wall of the fire door 1, and the end of the contact column 1702 away from the connecting frame 1701 passes through the avoidance groove, and the third elastic return member 1703 is arranged at the rotating connection between the connecting rod 7 and the upper shell 801, and the third elastic return member 1703 is used to provide a force to insert the limiting protrusion 18 into the limiting groove 19. The third elastic return member 1703 of this embodiment can be a torsion spring.

[0040] Reference Figure 2 The lower lock 9 includes a lower lock tongue 901 and a latch 902. The connecting rod 7 corresponding to the lower lock 9 is provided with a connecting groove at the end away from the main lock 6. The lower lock tongue 901 is inserted in the connecting groove to achieve connection with the connecting rod 7. The fire door 1 is provided with a lower lock hole near the lower lock tongue 901. The lower lock tongue 901 passes through the lower lock hole. A plurality of adjustment grooves 21 are provided on the lower lock tongue 901. An adjustment hole 20 is provided on the connecting rod 7 corresponding to the lower lock tongue 901. The lower lock tongue 901 is inserted into the adjustment hole 20 and inserted into one of the adjustment grooves 21. A flexible pad 22 is bonded to the side of the lower lock tongue 901 away from the corresponding connecting rod 7. The material of the flexible pad 22 in this embodiment can be rubber.

[0041] The implementation principle of a hidden door lock in the embodiment of the present application is as follows: when opening the door, pressing the push rod 402 causes the push rod 402 to squeeze the tilting rod 403, and the rotation of the tilting rod 403 drives the pressure rod 3 to rotate together, and when the pressure rod 3 rotates, it drives the rotating frame 602 to rotate together, and when the rotating frame 602 rotates, it drives the two sets of connecting rods 7 to slide through the upper locking rod 603 and the lower locking rod 604, so that the upper lock tongue 802 retracts into the upper lock hole, and the lower lock tongue 901 retracts into the lower lock hole. At this time, the limiting groove 19 on the upper lock tongue 802 moves to the position corresponding to the limiting protrusion 18, and the third elastic reset member 1 Under the action of 703, the limiting protrusion 18 is inserted into the limiting groove 19, so that the upper lock tongue 802 is locked. The upper lock tongue 802 is connected to the rotating frame 602 through the connecting rod 7 and the upper locking rod 603. Therefore, the rotation angle of the rotating frame 602 is fixed, and the lower lock tongue 901 also remains retracted into the lower lock hole. When closing the door, the contact column 1702 abuts against the door frame to rotate the connecting frame 1701, thereby disengaging the limiting protrusion 18 from the limiting groove 19. Under the action of the second elastic return member, the upper lock tongue 802 extends out of the upper lock hole, and the lower lock tongue 901 extends out of the lower lock hole. The present invention can reduce the space occupied by the fire door lock 1 and improve the convenience and aesthetics of the fire door lock 1.

[0042] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A hidden door lock, characterized by: The fireproof door (1) comprises a fireproof door (1), wherein the fireproof door (1) is a hollow structure, a lock body (2) is provided on the fireproof door (1), a pressure rod (3) is rotatably connected to the lock body (2), a driving mechanism (4) is provided on one side wall of the fireproof door (1), the driving mechanism (4) is used to drive the pressure rod (3) to rotate, a side wall of the fireproof door (1) is provided with a clearance groove (5), an end of the pressure rod (3) away from the driving mechanism (4) passes through the clearance groove (5), and the fireproof door (1) is locked. A main lock (6) is provided, one end of the pressure rod (3) passes through the give way groove (5) and abuts against the main lock (6), both ends of the main lock (6) are connected with connecting rods (7), one end of one group of connecting rods (7) away from the main lock (6) is connected with an upper lock (8), and the other end of the other group of connecting rods (7) away from the main lock (6) is connected with a lower lock (9), and the connecting rods (7), the upper lock (8) and the lower lock (9) are all provided in the fire door (1); The upper lock device (8) comprises an upper shell (801), an upper lock tongue (802) and a connecting plate (803), wherein the upper shell (801) is connected to the inside of the fire door (1), the connecting plate (803) is connected to the upper shell (801), the connecting rod (7) passes through the upper shell (801), the upper lock tongue (802) is connected to one end of the connecting rod (7) away from the main lock device (6), an upper lock hole is provided at the top of the fire door (1), the upper lock tongue (802) is inserted into the upper lock hole, a guide groove (15) is provided on the upper lock tongue (802), a guide block (16) is provided on the connecting plate (803), the guide block (16) is inserted into the guide groove (15), and a locking mechanism (17) is also provided on the upper shell (801), and the locking mechanism (17) is used to achieve locking of the upper lock tongue (802); The locking mechanism (17) includes a connecting frame (1701), a contact column (1702) and a third elastic reset member (1703), wherein the connecting frame (1701) is rotatably connected to the upper shell (801) and a limiting protrusion (18) is provided on one side of the connecting frame (1701), and a limiting groove (19) is provided on the peripheral wall of the upper lock tongue (802), wherein the limiting protrusion (18) can be inserted into the limiting groove (19), and the contact column (1702) is provided on the side of the connecting frame (1701). 02) is connected to the connecting frame (1701), the side wall of the fire door (1) is provided with an avoidance groove, the end of the contact column (1702) away from the connecting frame (1701) passes through the avoidance groove, the third elastic return member (1703) is provided between the connecting frame (1701) and the upper shell (801), and the third elastic return member (1703) is used to provide a force to separate the limiting protrusion (18) from the limiting groove (19).

2. The hidden door lock according to claim 1, characterized in that: The lock body (2) is provided with a first mounting hole (10) and a second mounting hole (11), the distance between the first mounting hole (10) and the main lock (6) is smaller than the distance between the second mounting hole (11) and the main lock (6), the pressure rod (3) is provided with a mounting shaft (12), the pressure rod (3) is rotatably connected to the lock body (2) through the mounting shaft (12), and the mounting shaft (12) can be inserted into the first mounting hole (10) or the second mounting hole (11).

3. The hidden door lock according to claim 1, characterized in that: The driving mechanism (4) comprises a driving support (401), a push rod (402), a tilting rod (403) and a first elastic reset member (404); the driving support (401) is connected to the fire door (1); the push rod (402) is slidably connected to the driving support (401); the tilting rod (403) is rotatably connected to the driving support (401); the first elastic reset member (404) is located between the push rod (402) and the fire door (1); one end of the tilting rod (403) abuts against the push rod (402), and the other end abuts against the pressure rod (3).

4. The hidden door lock according to claim 1, characterized in that: The main lock (6) comprises a lock housing (601), a rotating frame (602), an upper locking rod (603), a lower locking rod (604), a first connecting rod (605) and a second connecting rod (606); the lock housing (601) is connected to the interior of the fire door (1); the rotating frame (602) is rotatably connected to the lock housing (601); the upper locking rod (603) is slidably connected to the lock housing (601); one end of the upper locking rod (603) is connected to the rotating frame (602) through the first connecting rod (605); and the lower locking rod (604) is connected to the first connecting rod (605). The rotating frame (602) has one end connected to one of the connecting rods (7), and the other end is connected to the lower locking rod (604) which is slidably connected to the lock housing (601). One end of the lower locking rod (604) is connected to the rotating frame (602) through the second connecting rod (606), and the other end is connected to one of the connecting rods (7). A second elastic reset member is connected to the rotating frame (602), and one end of the second elastic reset member away from the rotating frame (602) is connected to the lock housing (601).

5. The hidden door lock according to claim 4, characterized in that: The rotating frame (602) is provided with an abutting shaft (13), a rotating sleeve (14) is rotatably connected to the abutting shaft (13), and one end of the pressure rod (3) away from the driving mechanism (4) abuts against the peripheral wall of the rotating sleeve (14).

6. The hidden door lock according to claim 1, characterized in that: The lower lock (9) includes a lower lock tongue (901), wherein one end of a group of the connecting rods (7) away from the main lock (6) is provided with a connecting groove, the lower lock tongue (901) is inserted into the connecting groove, and a lower lock hole is provided on the fire door (1), and the lower lock tongue (901) passes through the lower lock hole.

7. The hidden door lock according to claim 6, characterized in that: The lower lock tongue (901) further includes a latch (902); an adjustment hole (20) is provided on the connecting rod (7) where the lower lock tongue (901) is located; a plurality of adjustment slots (21) are provided on the lower lock tongue (901); and the latch (902) is inserted into the adjustment hole (20) and into one group of the adjustment slots (21).

8. The hidden door lock according to claim 6, characterized in that: A flexible pad (22) is provided at one end of the lower locking tongue (901) away from the connecting rod (7).

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