Fireproof anti-theft door lock with double lock cylinders

Abstract

The invention discloses a double-lock-cylinder fireproof anti-theft door lock which comprises a shell, a first lock cylinder, a second lock cylinder and an inner handle mechanism. A main spring bolt, an upper spring bolt, a lower spring bolt, a safety spring bolt and an inclined spring bolt which can stretch out and retract back are arranged in the shell. The first lock cylinder and the second lock cylinder are vertically inserted into the shell; the inner handle mechanism is arranged on the shell; a first shifting wheel and a second shifting wheel which are arranged in parallel from outside to inside are arranged on the first lock cylinder, and the first shifting wheel is driven by a first key; the second dial wheel is driven by an inner knob arranged on the shell; a third dial wheel is arranged on the second lock cylinder and is driven by a second key; the safety lock tongue is driven by a safety knob arranged on the shell; the inclined spring bolt is provided with an elastic piece used for enabling the inclined spring bolt to stretch out. The door lock is excellent in anti-theft performance and high in safety, can be used for departments such as financial places, party and government organizations, public institutions and museums, and is also suitable for families.

Description

Technical Field

[0001] This invention relates to the field of hardware lock technology, specifically to a double-lock-cylinder fireproof and burglarproof door lock. Background Technology

[0002] Fireproof and burglarproof door locks, as core components that combine security and fire protection functions, are widely used in various scenarios such as financial institutions, government departments, industrial plant equipment rooms, warehouses, and residences. Their performance is directly related to the safety of people's lives and property and the protection against theft.

[0003] Currently, fire doors and security doors on the market cannot truly achieve both fireproof and burglarproof functionality. Regarding burglarproofing, existing locks can only be locked from the inside; if no one is inside, the door cannot be locked from the outside. Someone outside can break the door or peephole and use tools to operate the door handle from the inside to open the door. In terms of fireproofing, they are either electronically controlled or purely mechanical locks. For mechanical fireproof locks, escape from inside is only possible by one-button opening via the inner handle. However, the structure of the inner handle is relatively complex, with many connecting parts. If the transmission part of the inner handle is damaged, trapped people cannot escape by other means. Electronically controlled locks are prone to electronic component failure and power loss in the event of a fire, also hindering escape. Therefore, the existing fire safety features are not high.

[0004] Furthermore, modern fireproof and burglarproof locks must meet the latest national and industry standards, such as the national standard GB 12955-2024 Fireproof Doors, the national standard GB 21556.2-2025 Lock Safety Technical Requirements Part 2: Burglarproof Locks, the industry standard GA 374-2019 Electronic Burglarproof Locks, and the industry standard GA / T73-2015 Mechanical Burglarproof Locks.

[0005] In summary, existing fireproof and burglarproof door locks have multiple problems, such as structural design defects and difficulty in achieving both functions. They cannot truly meet the needs of places with high requirements for fire prevention and burglarproofing, such as financial institutions, government agencies, public institutions, and museums.

[0006] Therefore, there is an urgent need for a more fire-resistant and theft-proof security door lock to meet the usage needs of the aforementioned locations. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a double-lock core fireproof and burglarproof door lock that facilitates user escape, takes into account anti-theft function, and has high security.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A double-lock-cylinder fireproof and burglarproof door lock includes a housing, a first lock cylinder, a second lock cylinder, and an inner handle mechanism;

[0010] The housing is provided with a main latch, an upper latch, a lower latch, a safety latch, and a slanted latch that can extend and retract; wherein, the upper latch is located above the main latch, the lower latch is located below the main latch, the safety latch is located between the main latch and the lower latch, and the slanted latch is located between the main latch and the upper latch.

[0011] The first lock cylinder and the second lock cylinder are vertically inserted into the housing; wherein, the first lock cylinder is located above the second lock cylinder;

[0012] The inner handle mechanism is mounted on the housing and can be used to extend and retract the main latch, the upper latch and the lower latch, and can also be used to retract the safety latch and the angled latch.

[0013] The first lock cylinder is provided with a first dial and a second dial arranged side by side from the outside to the inside. The first dial is driven by a first key and can be used to extend and retract the main bolt and the upper bolt, and can also be used to retract the oblique bolt. The second dial is driven by an inner knob provided on the housing and can be used to extend and retract the main bolt and the upper bolt, and can also be used to retract the lower bolt, the safety bolt and the oblique bolt.

[0014] The second lock cylinder is provided with a third dial, which is driven by a second key and can be used to extend and retract the lower lock tongue;

[0015] The safety latch is driven by a safety knob located on the housing, which can be used to extend and retract the safety latch; the angled latch is equipped with an elastic element for extending it.

[0016] As a further improvement to the above technical solution:

[0017] The lower locking tongue is equipped with a deadbolt plate. The third dial can drive the deadbolt plate to move into the deadbolt state, thereby preventing the lower locking tongue from retracting. When the deadbolt plate enters the deadbolt state, neither the first lock cylinder nor the inner handle mechanism can disengage from the deadbolt state.

[0018] The inner handle mechanism includes an inner handle, a first drive shaft, and a drive tube. The inner handle can drive the drive tube to rotate via the first drive shaft.

[0019] The transmission tube is connected in sequence from the outside to the inside to a first linkage component, a second linkage component, a third linkage component, and a fourth linkage component;

[0020] The first linkage component can be linked with the first dial and the inner handle respectively to retract the main bolt, the upper bolt and the oblique bolt;

[0021] The second linkage component can be linked with the first dial and the second dial respectively to extend the main bolt and the upper bolt, and can be linked with the inner handle to extend and retract the main bolt and the upper bolt;

[0022] The third linkage component can be linked with the inner handle to extend and retract the lower locking tongue;

[0023] The fourth linkage component can be linked with the second dial and the inner handle respectively, and drive the first linkage component, the second linkage component and the third linkage component to move, so as to retract the main bolt, the upper bolt, the lower bolt, the safety bolt and the oblique bolt.

[0024] The main latch is equipped with a main connecting plate and a main lever. The main connecting plate is connected to the main latch and is provided with a first horizontal groove, a first oblique groove and a first lever. The main lever is hinged to the housing through a first hinge shaft and is provided with a second lever located in the first oblique groove. The first hinge shaft is located in the first horizontal groove. Both the first linkage component and the second linkage component can drive the main lever to rotate.

[0025] The upper locking tongue is equipped with an upper connecting plate, an upper lever, and a top rod. The upper connecting plate is connected to the upper locking tongue and has a second horizontal groove and a third lever. The upper lever is hinged to the housing via a second hinge shaft and has a first vertical groove and a first arc-shaped groove. The second hinge shaft is located in the second horizontal groove, and the third lever is located in the first vertical groove. The top rod has a second oblique groove and a fourth lever. The first lever is located in the second oblique groove, and the fourth lever is located in the first arc-shaped groove.

[0026] The lower locking tongue is equipped with a lower connecting plate and a lower lever. The lower connecting plate is connected to the lower locking tongue and has a third horizontal groove and a third oblique groove. The lower lever is hinged to the housing through a third hinge shaft and has a fifth lever on it. The fifth lever is located in the third oblique groove, and the third hinge shaft is located in the third horizontal groove. The third linkage assembly can drive the lower lever to rotate.

[0027] The safety latch is located at one end of the housing and connected to a safety connecting plate. The safety connecting plate is provided with a fourth transverse groove and a first actuating port. The housing is provided with a limiting shaft and a fourth dial wheel. The limiting shaft is located in the fourth transverse groove. The fourth dial wheel is hinged to the housing and connected to the safety knob through a second transmission shaft. The fourth dial wheel is provided with a transmission plate and a boss. The boss extends into the first actuating port. The fourth linkage component can actuate the transmission plate to rotate, so that the boss drives the safety latch to retract.

[0028] The oblique locking tongue is equipped with a connecting rod, and the housing is provided with an abutment plate. The elastic element is sleeved on the outside of the connecting rod and abuts between the oblique locking tongue and the abutment plate to allow the oblique locking tongue to extend. The end of the connecting rod away from the oblique locking tongue is provided with a movable plate. The first linkage component can move the movable plate to retract the oblique locking tongue. The elastic element is preferably a spring.

[0029] The first linkage assembly includes a first rotating plate, a first linkage plate, and a first rotating plate; the first rotating plate is sleeved on the transmission tube and is provided with a toggle head for actuating the movable plate; the top of the first linkage plate is hinged to the side of the first rotating plate, the middle part is hinged to the first rotating plate, and the bottom is used to abut against the first dial wheel; the first rotating plate is hinged to the housing through the first hinge shaft, and the main dial is provided with an abutment shaft that can abut against the first rotating plate; wherein, the left side of the toggle head abuts against the abutment plate;

[0030] The second linkage component includes a second rotating plate and a second linkage plate; the second rotating plate is sleeved on the transmission tube and hinged to the top of the second linkage plate, the middle part of the second linkage plate is hinged to the main lever, and its bottom can abut against the first lever and the second lever;

[0031] The third linkage component includes a third rotating plate, a third linkage plate, and a gear; the third rotating plate is sleeved on the transmission tube and hinged to the top of the third linkage plate; the bottom of the third linkage plate is provided with a first transmission tooth, which meshes with the gear; the gear is hinged to the housing; and the lower paddle is provided with a second transmission tooth that meshes with the gear.

[0032] The fourth linkage component includes a fourth rotating plate and a fourth linkage plate; the fourth rotating plate is sleeved on the transmission tube and hinged to the top of the fourth linkage plate; the fourth linkage plate has an abutment edge in the middle that can abut against the second dial wheel, and a hook at the bottom that can hook the transmission plate; the fourth rotating plate has a first protrusion and a second protrusion; the first rotating plate has a first shoulder that can abut against the first shoulder; the third rotating plate has a second shoulder that can abut against the second shoulder.

[0033] The outer side of the transmission tube is provided with four abutting planes. The inner rings of the first rotating plate, the second rotating plate, the third rotating plate and the fourth rotating plate are each provided with four abutting protrusions. The upper edge of the abutting protrusion on the right side of the first rotating plate and the fourth rotating plate abuts against the abutting plane on the right side. The lower edge of the abutting protrusion on the right side of the second rotating plate and the third rotating plate abuts against the abutting plane on the right side.

[0034] The lower connecting plate is provided with a limiting pin, and the anti-locking plate is hinged to the third hinge shaft. It is provided with a slot, a second actuating port and an actuating edge. The third actuating wheel can extend into the second actuating port to rotate the anti-locking plate. When the lower connecting plate is extended, the third actuating wheel can also abut against the actuating edge to rotate the anti-locking plate further, so that the limiting pin engages with the slot, thereby preventing the lower connecting plate from retracting.

[0035] The lower paddle is also provided with a third actuation port, and the third dial can be inserted into the third actuation port to rotate the lower paddle.

[0036] It also includes an outer handle, an outer panel, and a power supply. The outer handle is located on the outer panel, which is used to connect to the door. The outer panel has a first lock hole, a second lock hole, and a human-machine interaction module. The first lock hole corresponds to the first lock cylinder, and the second lock hole corresponds to the second lock cylinder. A motor is also provided between the inner handle and the transmission tube. The motor can drive the transmission tube to rotate. The human-machine interaction module is electrically connected to the motor, and the power supply is used to supply power to the human-machine interaction module and the motor.

[0037] The inner handle mechanism also includes an inner panel for connecting to the door. The motor is located inside the inner panel, and the inner handle, the inner knob, and the safety knob are all located outside the inner panel. The inner panel is also provided with a third lock hole corresponding to the second lock cylinder.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] 1. The double-lock cylinder fireproof and burglarproof door lock disclosed in this invention can unlock all lock tongues at once with all lock tongues extended, using the inner handle mechanism and inner knob. Even if the inner handle mechanism is damaged, the door can still be unlocked by the inner knob, facilitating escape for users inside and improving fire safety. When the lower lock tongue is extended and locked, the user outside must first use the second key to retract the lower lock tongue to unlock it before using the first key to retract and unlock the main lock tongue, upper lock tongue, and oblique lock tongue. However, when the safety lock tongue is locked from the inside using the safety knob, the user outside cannot unlock the door using either the first or second key. It has excellent anti-theft performance and extremely high security, making it suitable not only for home use but also for use in financial institutions, government agencies, public institutions, museums, and other organizations.

[0040] 2. The double-lock cylinder fireproof and burglarproof door lock disclosed in this invention further allows for the following when the lock is used in places with higher security requirements, such as banks, safes, prisons, and museums. The second key can drive the third dial to rotate, causing the deadbolt plate to move and enter a deadbolt state. In this state, neither the inner handle mechanism nor the first lock cylinder can be released from the deadbolt state. Only after the second key drives the third dial to rotate in the opposite direction to release the deadbolt state can the inner handle mechanism and the first lock cylinder unlock other bolts. This effectively prevents people outside the door from breaking the door or peephole and then using tools to push the inner handle mechanism to unlock and open the door, further improving the anti-theft performance.

[0041] 3. The double-lock core fireproof and burglarproof door lock disclosed in this invention further enables the inner handle mechanism to move via a motor, thereby realizing the function of the inner handle mechanism. When outside the door, the user can realize intelligent lock opening and closing through the human-machine interaction module. When inside the door, the user can also unlock the door with one button through the motor, the inner handle, and the inner knob. This makes unlocking the door from the inside convenient. If any part is damaged due to fire, the door can still be unlocked and escaped through other means, saving time and effort and facilitating emergency escape. Attached Figure Description

[0042] Figure 1 This is a first-view three-dimensional structural diagram of the double-lock core fireproof and burglarproof door lock of the present invention.

[0043] Figure 2 This is a two-dimensional structural diagram of the double-lock core fireproof and burglarproof door lock of the present invention from a second perspective.

[0044] Figure 3 This is a three-dimensional structural diagram of the double-lock core fireproof and burglarproof door lock of the present invention with the inner handle and inner panel removed.

[0045] Figure 4 This is a schematic diagram of the structure inside the housing from a first-view perspective in this invention.

[0046] Figure 5 for Figure 4A magnified schematic diagram of the structure at point A in the middle.

[0047] Figure 6 for Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0048] Figure 7 This is a schematic diagram of the structure from a second perspective inside the housing in this invention.

[0049] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point C.

[0050] Figure 9 for Figure 7 A magnified schematic diagram of the structure at point D.

[0051] Figure 10 This is a partially enlarged structural diagram of the transmission tube in this invention.

[0052] Figure 11 This is a partially enlarged structural diagram of the connection between the first rotating plate and the transmission pipe in this invention.

[0053] Figure 12 This is a partially enlarged schematic diagram of the connection between the second rotating plate and the transmission pipe in this invention.

[0054] Figure 13 This is a partially enlarged structural diagram of the first and second dials in this invention.

[0055] Figure 14 This is a partially enlarged structural diagram of the unlocked state of the third dial in this invention.

[0056] Figure 15 This is a partially enlarged structural diagram of the locked state at the third dial in this invention.

[0057] The labels in the diagram represent: 10, housing; 11, main latch; 111, main connecting plate; 1111, first horizontal groove; 1112, first oblique groove; 1113, first lever; 1114, sixth lever; 112, main lever; 1121, second lever; 1122, abutment shaft; 119, first hinge shaft; 12, upper latch; 121, upper connecting plate; 1211, second horizontal groove; 1212, third lever; 122, upper lever; 1221, first vertical groove; 1222, first arc-shaped groove; 123, top rod; 1231, second oblique groove; 1232, fourth lever; 129, second hinge shaft; 13. Lower locking tongue; 131, Lower connecting plate; 1311, Third transverse groove; 1312, Third oblique groove; 1313, Limiting pin; 132, Lower lever; 1321, Fifth lever; 1322, Second transmission gear; 1323, Third actuation port; 139, Third hinge shaft; 14, Safety locking tongue; 141, Safety knob; 142, Safety connecting plate; 143, Fourth transverse groove; 144, First actuation port; 145, Limiting shaft; 146, Fourth lever; 1461, Boss; 147, Second transmission shaft; 148, Transmission plate; 15, Oblique locking tongue; 151, Elastic element; 152, Connecting rod; 153, Abutment plate; 1 54. Movable plate; 16. Ground rod; 161. Fourth inclined groove; 20. First lock cylinder; 21. First dial wheel; 22. Second dial wheel; 30. Second lock cylinder; 31. Third dial wheel; 40. Inner handle mechanism; 41. Inner handle; 42. First drive shaft; 43. Drive tube; 431. Abutment plane; 44. First linkage assembly; 441. First rotating plate; 4411. Actuating head; 4412. First shoulder; 442. First linkage plate; 443. First rotating plate; 45. Second linkage assembly; 451. Second rotating plate; 452. Second linkage plate; 46. Third linkage assembly; 461. Third rotating plate Plate; 4611, Second shoulder; 462, Third linkage plate; 4621, First transmission gear; 463, Gear; 47, Fourth linkage assembly; 471, Fourth rotating plate; 4711, First protrusion; 4712, Second protrusion; 472, Fourth linkage plate; 4721, Abutting edge; 4722, Hook; 48, Inner panel; 50, Inner knob; 51, Third transmission shaft; 60, Anti-lock plate; 601, Slot; 602, Second actuating port; 603, Actuating edge; 70, Motor; 90, First key; 91, Second key; 92, Outer handle; 93, Outer panel; 94, Human-machine interaction module. Detailed Implementation

[0058] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] As shown in the specification and claims of this invention, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect.

[0060] like Figures 1 to 15 As shown, the clockwise and counterclockwise directions described in this embodiment are both based on... Figure 4 For the purposes of this embodiment, the double-lock cylinder fireproof and burglarproof door lock includes a housing 10, a first lock cylinder 20, a second lock cylinder 30, and an inner handle mechanism 40;

[0061] The housing 10 is provided with a main locking tongue 11 that can extend and retract, an upper locking tongue 12, a lower locking tongue 13, a safety locking tongue 14, and a slanted locking tongue 15;

[0062] The first lock cylinder 20 and the second lock cylinder 30 are vertically inserted into the housing 10; it should be noted that the first lock cylinder 20 is located above the second lock cylinder 30;

[0063] The inner handle mechanism 40 is provided on the housing 10 and can be used to extend and retract the main latch 11, the upper latch 12 and the lower latch 13, and can also be used to retract the safety latch 14 and the oblique latch 15.

[0064] The first lock cylinder 20 is provided with a first dial 21 and a second dial 22 arranged side by side from the outside to the inside. The first dial 21 is driven by the first key 90 and can be used to extend and retract the main bolt 11 and the upper bolt 12, and can also be used to retract the oblique bolt 15. The second dial 22 is driven by the inner knob 50 provided on the housing 10 and can be used to extend and retract the main bolt 11 and the upper bolt 12, and can also be used to retract the lower bolt 13, the safety bolt 14 and the oblique bolt 15. It should be noted that the thickness of the first dial 21 is greater than the thickness of the second dial 22.

[0065] The second lock cylinder 30 is provided with a third dial 31, which is driven by the second key 91 and can be used to extend and retract the lower lock tongue 13;

[0066] The safety latch 14 is driven by a safety knob 141 provided on the housing 10. The safety knob 141 can be used to extend and retract the safety latch 14; the angled latch 15 is provided with an elastic element 151 for extending it.

[0067] After installation, this double-lock fireproof and burglarproof door lock can be locked by extending the oblique lock tongue 15 to achieve the most basic anti-theft function;

[0068] When the user is outside the door, the first key 90 can rotate the first dial 21 to extend the main bolt 11 and the upper bolt 12 to lock the door. It can also rotate the first dial 21 in the opposite direction to retract the main bolt 11, the upper bolt 12, and the oblique bolt 15 to unlock the door. However, the first key 90 cannot retract the lower bolt 13 and the safety bolt 14. Therefore, when the lower bolt 13 and / or the safety bolt 14 are extended, the first key 90 cannot unlock the door. The second key 91 can rotate the third dial 31 to extend the lower bolt 13 to lock the door. It can also rotate the third dial 31 in the opposite direction to retract the lower bolt 13 to unlock the door. The second key 91 is only effective for the lower bolt 13.

[0069] When the user is inside the door, rotating the inner handle mechanism 40 can extend the main latch 11, upper latch 12, and lower latch 13 to lock, or rotate it in the opposite direction to retract all the latches and unlock. The inner knob 50 can drive the second dial 22 to extend the main latch 11 and upper latch 12 to lock, or drive the second dial 22 to retract all the latches and unlock. The safety knob 141 can be used to extend the safety latch 14 to lock and retract it to unlock.

[0070] With all bolts extended, the inner handle mechanism 40 and inner knob 50 can unlock all bolts at once. Even if the inner handle mechanism 40 is damaged, the door can still be opened by the inner knob 50, facilitating escape for users inside and improving fire safety. When the lower bolt 13 is extended and locked, users outside must first use the second key 91 to retract the lower bolt 13 to unlock it before using the first key 90 to retract the main bolt 11, upper bolt 12, and oblique bolt 15 to unlock them. However, when the safety bolt 14 is locked from inside the door using the safety knob 141, users outside cannot unlock the door using either the first key 90 or the second key 91. This lock offers excellent anti-theft performance and high security, making it suitable not only for home use but also for use in financial institutions, government agencies, public institutions, museums, and other organizations.

[0071] In this embodiment, the lower latch 13 is equipped with a deadbolt plate 60. The third dial 31 can drive the deadbolt plate 60 to move into the deadbolt state, thereby preventing the lower latch 13 from retracting. When the deadbolt plate 60 is in the deadbolt state, neither the first lock cylinder 20 nor the inner handle mechanism 40 can be released from the deadbolt state. Specifically, when the lock is used in places with higher security requirements such as banks, safes, prisons, and museums, the second key 91 can also drive the third dial 31 to rotate, causing the deadbolt plate 60 to move into the deadbolt state. At this time, neither the inner handle mechanism 40 nor the first lock cylinder 20 can be released from the deadbolt state. The second key 91 must drive the third dial 31 to rotate in the opposite direction to release the deadbolt state before the inner handle mechanism 40 and the first lock cylinder 20 can be used to unlock other latches. This can effectively prevent people outside the door from breaking the door or peephole and then using tools to push the inner handle mechanism 40 to unlock and open the door, further improving the anti-theft performance.

[0072] It should be noted that the upper locking bolt 12 is located above the main locking bolt 11, the lower locking bolt 13 is located below the main locking bolt 11, the safety locking bolt 14 is located between the main locking bolt 11 and the lower locking bolt 13, and the oblique locking bolt 15 is located between the main locking bolt 11 and the upper locking bolt 12.

[0073] In this embodiment, the door lock also includes an outer handle 92, an outer panel 93, and a power supply (not shown in the figure). The outer handle 92 is disposed on the outer panel 93, which is used to connect to the door. The outer panel 93 is provided with a first lock hole, a second lock hole, and a human-machine interaction module 94. The first lock hole corresponds to the first lock cylinder 20, and the second lock hole corresponds to the second lock cylinder 30. The inner handle mechanism 40 is equipped with a motor 70. The human-machine interaction module 94 is electrically connected to the motor 70. The power supply is used to supply power to the human-machine interaction module 94 and the motor 70. The power supply can be disposed in the housing of the motor 70. Specifically, the outer handle 92 is fixedly connected to the outer panel 93, which serves to prevent dust and protect the door lock. The motor 70 drives the inner handle mechanism 40, thus enabling its function. The human-machine interface module 94 can be selected as a module with fingerprint, face, password, palm print, and voiceprint recognition functions (existing technology, not described here). Furthermore, after being identified by the human-machine interface module 94 from outside the door, the user can unlock and open the door by having the motor 70 drive the inner handle mechanism 40. However, when the latch 13 is deadbolted, the motor 70 is ineffective and cannot unlock. Therefore, when this door lock is used in locations with high security requirements, the first key 90 and the second key 91 can be stored separately, further improving security. The motor 70 is also equipped with a microcontroller (not shown in the figure), which controls the motor 70 and the human-machine interface module 94. The control principle is existing technology and will not be described here.

[0074] In this embodiment, the inner handle mechanism 40 includes an inner handle 41, a first drive shaft 42, and a drive tube 43. The inner handle 41 can drive the drive tube 43 to rotate through the first drive shaft 42. The motor 70 is connected to the drive tube 43 and can drive the drive tube 43 to rotate. The inner handle mechanism 40 also includes an inner panel 48 for connecting to the door. The motor 70 is located inside the inner panel 48. The inner handle 41, the inner knob 50, and the safety knob 141 are all located outside the inner panel 48. The inner panel 48 is also provided with a third lock hole corresponding to the second lock cylinder 30. Specifically, the first drive shaft 42 can be selected as a square shaft, triangular shaft, or other shapes to facilitate transmission; the inner handle 41 is sleeved on the first drive shaft 42, and the first drive shaft 42 is connected to the transmission tube 43 through the motor 70, so that both the motor 70 and the inner handle 41 can drive the transmission tube 43 to rotate; the inner panel 48 can play the role of dust prevention and protection of the door lock; the inner knob 50 is connected to the second dial 22 through the third drive shaft 51, which is preferably a key-like plate structure to facilitate insertion into the first lock cylinder 20 for transmission, but it can also be an irregularly shaped shaft, polygonal shaft, etc.

[0075] In this embodiment, the transmission tube 43 is connected sequentially from the outside to the inside to the first linkage component 44, the second linkage component 45, the third linkage component 46 and the fourth linkage component 47;

[0076] The first linkage component 44 can be linked with the first dial 21 and the inner handle 41 respectively to retract the main locking bolt 11, the upper locking bolt 12 and the oblique locking bolt 15.

[0077] The second linkage component 45 can be linked with the first dial 21 and the second dial 22 respectively to extend the main locking tongue 11 and the upper locking tongue 12, and can be linked with the inner handle 41 to extend and retract the main locking tongue 11 and the upper locking tongue 12.

[0078] The third linkage component 46 can be linked with the inner handle 41 to extend and retract the lower locking tongue 13;

[0079] The fourth linkage component 47 can be linked with the second dial 22 and the inner handle 41 respectively, and drive the first linkage component 44, the second linkage component 45 and the third linkage component 46 to move, so that the main locking tongue 11, the upper locking tongue 12, the lower locking tongue 13, the safety locking tongue 14 and the oblique locking tongue 15 retract.

[0080] In this embodiment, the main latch 11 is equipped with a main connecting plate 111 and a main lever 112. The main connecting plate 111 is connected to the main latch 11 and is provided with a first horizontal groove 1111, a first inclined groove 1112 and a first lever 1113. The main lever 112 is hinged to the housing 10 through a first hinge shaft 119 and is provided with a second lever 1121 located in the first inclined groove 1112. The first hinge shaft 119 is located in the first horizontal groove 1111. Both the first linkage component 44 and the second linkage component 45 can drive the main lever 112 to rotate.

[0081] The upper locking tongue 12 is equipped with an upper connecting plate 121, an upper lever 122, and a top rod 123. The upper connecting plate 121 is connected to the upper locking tongue 12 and has a second horizontal groove 1211 and a third lever 1212. The upper lever 122 is hinged to the housing 10 through a second hinge shaft 129 and has a first vertical groove 1221 and a first arc groove 1222. The second hinge shaft 129 is located in the second horizontal groove 1211, and the third lever 1212 is located in the first vertical groove 1221. The top rod 123 has a second inclined groove 1231 and a fourth lever 1232. The first lever 123 is located in the second inclined groove 1231, and the fourth lever 1232 is located in the first arc groove 1222.

[0082] The lower locking tongue 13 is equipped with a lower connecting plate 131 and a lower lever 132. The lower connecting plate 131 is connected to the lower locking tongue 13 and has a third horizontal groove 1311 and a third inclined groove 1312. The lower lever 132 is hinged to the housing 10 through a third hinge shaft 139 and has a fifth lever 1321. The fifth lever 1321 is located in the third inclined groove 1312, and the third hinge shaft 139 is located in the third horizontal groove 1311. The third linkage component 46 can drive the lower lever 132 to rotate.

[0083] The safety latch 14 is located at one end of the housing 10 and connected to a safety connecting plate 142. The safety connecting plate 142 is provided with a fourth transverse groove 143 and a first actuating port 144. The housing 10 is provided with a limiting shaft 145 and a fourth dial 146. The limiting shaft 145 is located in the fourth transverse groove 143. The fourth dial 146 is hinged to the housing 10 and connected to the safety knob 141 through a second transmission shaft 147. The fourth dial 146 is provided with a transmission plate 148 and a boss 1461. The boss 1461 extends into the first actuating port 144. The fourth linkage component 47 can actuate the transmission plate 148 to rotate, so that the boss 1461 drives the safety latch 14 to retract. Specifically, the movement of the safety connecting plate 142 can be limited by the limiting shaft 145. The second transmission shaft 147 can be a square shaft, a polygonal shaft, or an irregularly shaped shaft, as long as it can play a transmission role.

[0084] The oblique locking tongue 15 is equipped with a connecting rod 152, and the housing 10 is provided with an abutment plate 153. An elastic element 151 is sleeved on the outside of the connecting rod 152 and abuts between the oblique locking tongue 15 and the abutment plate 153 to extend the oblique locking tongue 15. A movable plate 154 is provided at the end of the connecting rod 152 away from the oblique locking tongue 15. The first linkage assembly 44 can move the movable plate 154 to retract the oblique locking tongue 15. Specifically, the elastic element 151 is preferably a spring. The spring force keeps the oblique locking tongue 15 in the extended state, and the housing 10 is provided with a limiting groove for the movable plate 154 to move laterally left and right.

[0085] In this embodiment, the first linkage assembly 44 includes a first rotating plate 441, a first linkage plate 442, and a first rotating plate 443; the first rotating plate 441 is sleeved on the transmission tube 43 and is provided with a toggle head 4411 for actuating the movable plate 154; the top of the first linkage plate 442 is hinged to the side of the first rotating plate 441, the middle part is hinged to the first rotating plate 443, and the bottom is used to abut against the first dial wheel 21; the first rotating plate 443 is hinged to the housing 10 through a first hinge shaft 119, and the main dial 112 is provided with an abutment shaft 1122 that can abut against the first rotating plate 443; specifically, as Figure 10 As shown, the left side of the actuating head 4411 abuts against the abutting plate 153; the bottom of the first linkage plate 442 is provided with a bent part to facilitate abutting against the first dial 21.

[0086] The second linkage assembly 45 includes a second rotating plate 451 and a second linkage plate 452; the second rotating plate 451 is sleeved on the transmission tube 43 and hinged to the top of the second linkage plate 452, the middle part of the second linkage plate 452 is hinged to the main lever 112, and its bottom can abut against the first lever 21 and the second lever 22; the bottom of the second linkage plate 452 is provided with a bent part to facilitate abutment against the first lever 21 and the second lever 22.

[0087] The third linkage assembly 46 includes a third rotating plate 461, a third linkage plate 462, and a gear 463; the third rotating plate 461 is sleeved on the transmission tube 43 and hinged to the top of the third linkage plate 462; the bottom of the third linkage plate 462 is provided with a first transmission tooth 4621, which meshes with the gear 463; the gear 463 is hinged to the housing 10; and the lower paddle 132 is provided with a second transmission tooth 1322 that meshes with the gear 463.

[0088] The fourth linkage assembly 47 includes a fourth rotating plate 471 and a fourth linkage plate 472. The fourth rotating plate 471 is sleeved on the transmission tube 43 and hinged to the top of the fourth linkage plate 472. The fourth linkage plate 472 has an abutment edge 4721 in the middle that can abut against the second dial wheel 22, and a hook part 4722 at its bottom that can hook the transmission plate 148. The fourth rotating plate 471 has a first protrusion 4711 and a second protrusion 4712. The first rotating plate 441 has a first shoulder 4412, and the first protrusion 4711 can abut against the first shoulder 4412. The third rotating plate 461 has a second shoulder 4611, and the second protrusion 4712 can abut against the second shoulder 4611.

[0089] In this embodiment, the outer side of the transmission tube 43 is provided with four abutment surfaces 431, and the inner rings of the first rotating plate 441, the second rotating plate 451, the third rotating plate 461, and the fourth rotating plate 471 are all provided with four abutment protrusions. The upper edge of the right abutment protrusion of the first rotating plate 441 and the fourth rotating plate 471 abuts against the right abutment surface 431, and the lower edge of the right abutment protrusion of the second rotating plate 451 and the third rotating plate 461 abuts against the right abutment surface 431. Specifically, as shown... Figures 10 to 12 As shown, the upper edges of the abutting protrusions on the right sides of the first rotating plate 441 and the fourth rotating plate 471 abut against the abutting plane 431 on the right side of the transmission tube 43, and the lower edges of the abutting protrusions on the right sides of the second rotating plate 451 and the third rotating plate 461 abut against the abutting plane 431 on the right side of the transmission tube 43. When the transmission tube 43 rotates clockwise, it first drives the first rotating plate 441 and the fourth rotating plate 471 to rotate clockwise. Only after the transmission tube 43 has rotated a certain angle can it drive the second rotating plate 451 and the third rotating plate 461 to rotate clockwise. The moving plate 461 rotates clockwise together; similarly, when the transmission tube 43 rotates counterclockwise, the transmission tube 43 directly drives the second rotating plate 451 and the third rotating plate 461 to rotate counterclockwise. However, since the left side of the actuating head 4411 of the first rotating plate 441 abuts against the abutting plate 153, the abutting plate 153 restricts the counterclockwise rotation of the first rotating plate 441, thereby restricting the counterclockwise rotation angle of the transmission tube 43, and thus the transmission tube 43 cannot drive the first rotating plate 441 and the fourth rotating plate 471 to rotate counterclockwise.

[0090] When the user uses the first key 90 to rotate the first dial 21 counterclockwise from outside the door, the first dial 21 abuts against the bottom of the second linkage plate 452, causing the second linkage plate 452 to move upward. The middle part of the second linkage plate 452 drives the main lever 112 to rotate counterclockwise around the first hinge shaft 119. The second lever 1121 on the main lever 112 moves along the lower edge of the first inclined groove 1112 and pushes the main connecting plate 111 to move to the left, causing the main lock tongue 11 to extend and lock. At the same time, the first hinge shaft 119 moves in the first transverse groove 1111. The main connecting plate 111 is limited; during the leftward movement of the main connecting plate 111, the first lever 1113 moves along the upper edge of the second inclined groove 1231 and pushes the top lever 123 upward, and the fourth lever 1232 moves along the upper edge of the first arc groove 1222, causing the upper lever 122 to rotate clockwise around the second hinge shaft 129. When the upper lever 122 rotates clockwise, it drives the third lever 1212 to move to the left through the first vertical groove 1221, thereby causing the upper connecting plate 121 to move to the left, so as to realize the extension and locking of the upper locking tongue 12. At the same time as the second linkage plate 452 moves upward, the top of the second linkage plate 452 drives the second rotating plate 451 to rotate counterclockwise around the transmission tube 43. Since the upper edge of the right side of the second rotating plate 451 that abuts against the protrusion needs to rotate counterclockwise by a certain angle before it can abut against the abutting plane 431 on the right side of the transmission tube 43, the first lever 21 cannot drive the transmission tube 43 to rotate when it rotates counterclockwise. Therefore, the user can use the first key 90 from outside the door to extend and lock the main bolt 11 and the upper bolt 12.

[0091] When the user uses the first key 90 to rotate the first dial 21 clockwise from outside the door, the first dial 21 abuts against the bottom of the first linkage plate 442, causing the first linkage plate 442 to move upward. The middle part of the first linkage plate 442 drives the first rotating piece 443 to rotate clockwise around the first hinge shaft 119. The first rotating piece 443 can abut against the abutting shaft 1122 on the main dial piece 112 when the main latch 11 is in the extended state, thereby causing the main dial piece 112 to rotate clockwise around the first hinge shaft 119, which can drive the main connecting plate 111 to move to the right, thereby causing the main latch 11 to retract, and driving the top rod 123 to move downward, ultimately causing the upper latch 12 to retract. Simultaneously, the top of the first linkage plate 442 pushes the first rotating plate 441 to rotate clockwise around the transmission tube 43, causing the actuating head 4411 to move the movable plate 154 to the right, thereby retracting the oblique locking tongue 15 and compressing the spring. After the first key 90 relieves the force on the first dial wheel 21, the spring can eject the oblique locking tongue 15 again. During the clockwise rotation of the first rotating plate 441, the lower edge of the abutting protrusion on the right side of the first rotating plate 441 needs to rotate clockwise by a certain angle before it can abut against the abutting plane 431 on the right side of the transmission tube 43. Therefore, the first dial wheel 21 cannot drive the transmission tube 43 to rotate when rotating clockwise. Thus, the user can unlock the door from outside using the first key 90 by retracting the main locking tongue 11, the upper locking tongue 12, and the oblique locking tongue 15.

[0092] When the user rotates the transmission tube 43 counterclockwise using the inner handle 41 from inside the door, the transmission tube 43 only drives the second rotating plate 451 and the third rotating plate 461 to rotate counterclockwise. The second rotating plate 451 drives the second linkage plate 452 to move upward, thereby extending and locking the main latch 11 and the upper latch 12. At the same time, the third rotating plate 461 drives the third linkage plate 462 to move upward, driving the gear 463 to rotate counterclockwise through the first transmission gear 4621. The gear 463 drives the lower lever 132 to rotate clockwise around the third hinge shaft 139 through the second transmission gear 1322. The fifth lever 1321 abuts against the upper edge of the third inclined groove 1312, causing the lower connecting plate 131 to move to the left, thereby extending the lower latch 13. Therefore, the user can extend and lock the main latch 11, the upper latch 12, and the lower latch 13 by rotating the inner handle 41 counterclockwise from inside the door.

[0093] When the user rotates the transmission tube 43 clockwise using the inner handle 41 from inside the door, the transmission tube 43 can rotate all the rotating plates in the locked state clockwise. When the first rotating plate 441 rotates clockwise, the main latch 11, the upper latch 12, and the oblique latch 15 can retract and unlock. When the fourth rotating plate 471 rotates clockwise, it can drive the fourth linkage plate 472 to move upward. The hook 4722 of the fourth linkage plate 472 can hook the transmission plate 148 to rotate the fourth dial wheel 146 clockwise, thereby moving to the right through the boss 1461 in the first actuation port 144, thereby moving the safety connecting plate 142 to the right, and finally retracting the safety latch 14 to unlock. When the third rotating plate 461 rotates clockwise, it drives the third linkage plate 462 to move downward, causing the gear 463 to rotate clockwise, causing the lower lever 132 to rotate counterclockwise, and finally retracting the lower latch 13. Therefore, the user can retract and unlock the main bolt 11, upper bolt 12, lower bolt 13, safety bolt 14, and angled bolt 15 by rotating the inner handle 41 counterclockwise from inside the door.

[0094] When the user rotates the second dial 22 clockwise using the inner knob 50 from inside the door, the second dial 22 abuts against the abutting edge 4721 of the fourth linkage plate 472, causing the fourth linkage plate 472 to move upward, thereby retracting the safety latch 14 through the hook 4722; when the fourth linkage plate 472 moves upward, it causes the fourth rotating plate 471 to rotate clockwise, abutting against the first shoulder 4412 of the first rotating plate 441 through the first protrusion 4711, causing the first rotating plate 441 to rotate clockwise, thereby retracting the main latch 11, the upper latch 12, and the oblique latch 15; at the same time, the second protrusion 4712 abuts against the second shoulder 4611 in the locked state, causing the third rotating plate 461 to rotate clockwise, thereby retracting the lower latch 13. Therefore, the user can retract and unlock the main bolt 11, upper bolt 12, lower bolt 13, safety bolt 14, and angled bolt 15 by rotating the inner knob 50 from inside the door.

[0095] When the user rotates the second dial 22 counterclockwise using the inner knob 50 from inside the door, the second dial 22 abuts against the bottom of the second linkage plate 452, causing the second linkage plate 452 to move upward, ultimately extending and locking the main bolt 11 and the upper bolt 12. Therefore, the user can extend and lock the main bolt 11 and the upper bolt 12 by rotating the inner knob 50 from inside the door.

[0096] It should be noted that the function of the motor 70 driving the transmission tube 43 to rotate is the same as that of manually rotating the inner handle 41. Therefore, when the user is outside the door, they can realize the intelligent opening and closing of the lock through the human-machine interaction module 94. When inside the door, they can also unlock the door with one button through the motor 70, the inner handle 41 and the inner knob 50. This makes the unlocking operation inside the door convenient. If any of the components is damaged due to a fire, the door can still be unlocked and escaped through other means, saving time and effort and facilitating emergency escape.

[0097] The first dial 21 of the first lock cylinder 20 is only responsible for locking and unlocking part of the bolts. The second dial 22 can open all the bolts at once. The inner knob 50 and the inner handle 41 can play the same role, providing a dual escape function. In the event of a malfunction of the inner handle 41, safety can be guaranteed. The second lock cylinder 30 can be deadbolted from both the inside and outside. After being deadbolted, neither the first lock cylinder 20 nor the inner handle 41 can open the lock body. This design increases the double protection of the lock, more than doubling the time it takes for thieves to break the lock, resulting in a higher level of security and more convenient fire escape.

[0098] In this embodiment, the lower connecting plate 131 is provided with a limiting pin 1313, and the anti-locking plate 60 is hinged to the third hinge shaft 139. The anti-locking plate 60 has a slot 601, a second actuating port 602, and an actuating edge 603. The third deflector 31 can extend into the second actuating port 602 to rotate the anti-locking plate 60. After the lower connecting plate 131 is extended, the third deflector 31 can also abut against the actuating edge 603 to further rotate the anti-locking plate 60, so that the limiting pin 1313 engages with the slot 601. The lower deflector 132 is also provided with a third actuating port 1323, and the third deflector 31 can extend into the third actuating port 1323 to rotate the lower deflector 132. Specifically, in the unlocked state, the second actuating port 602 and the third actuating port 1323 face the same direction.

[0099] When the user rotates the third dial 31 counterclockwise using the second key 91 from outside the door, the third dial 31 extends into the second actuation port 602 and the third actuation port 1323, causing the lower lever 132 and the deadbolt 60 to rotate clockwise around the third hinge axis 139. The lower lever 132 causes the lower latch 13 to extend. Rotating the second key 91 again causes the third dial 31 to abut against the actuation edge 603, further rotating the deadbolt 60. This causes the limit pin 1313 to engage with the slot 601, entering the deadbolt state and preventing the lower latch 13 from retracting. At the same time, the inner handle 41 and the inner knob 50 will become ineffective. The deadbolt state can only be restored after the second key 91 is reversed to disengage the deadbolt 600 from the slot 601 and the limit pin 1313. The user can also lock and unlock the door from inside using the second key 91, which is convenient and applicable to various security situations.

[0100] In this embodiment, the housing 10 includes two sub-shells. The housing 10 also includes a ground rod 16. The main connecting plate 111 is also provided with a sixth lever 1114. The ground rod 16 is provided with a fourth inclined groove 161. The sixth lever 1114 is located in the fourth inclined groove 161. When the main connecting plate 111 moves to the left, it can drive the ground rod 16 to move downward. Both the top rod 123 and the ground rod 16 can be equipped with corresponding locking tongues to further enhance the function of the top and bottom locks.

[0101] It should be noted that, as Figure 5 , Figure 6 and Figure 14 As shown, both ends of the first inclined groove 1112 and the third inclined groove 1312 are provided with limiting ends. When the second lever 1121 causes the main connecting plate 111 to extend or retract, it can be limited by the limiting end of the first inclined groove 1112. When the fifth lever 1321 causes the lower connecting plate 131 to extend or retract, it can be limited by the limiting end of the third inclined groove 1312. The design of the limiting end can prevent abnormal displacement of the locking tongue.

[0102] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A double-lock cylinder fireproof and burglarproof door lock, characterized in that: It includes a housing (10), a first lock cylinder (20), a second lock cylinder (30), and an inner handle mechanism (40). The housing (10) is provided with an extendable and retractable main latch (11), upper latch (12), lower latch (13), safety latch (14) and oblique latch (15). The first lock cylinder (20) and the second lock cylinder (30) are vertically inserted into the housing (10); The inner handle mechanism (40) is provided on the housing (10) and can be used to extend and retract the main locking tongue (11), the upper locking tongue (12) and the lower locking tongue (13), and can also be used to retract the safety locking tongue (14) and the oblique locking tongue (15); The first lock cylinder (20) is provided with a first dial (21) and a second dial (22) arranged side by side from the outside to the inside. The first dial (21) is driven by the first key (90) and can be used to extend and retract the main lock tongue (11) and the upper lock tongue (12), and can also be used to retract the oblique lock tongue (15). The second dial (22) is driven by the inner knob (50) provided on the housing (10) and can be used to extend and retract the main lock tongue (11) and the upper lock tongue (12), and can also be used to retract the lower lock tongue (13), the safety lock tongue (14) and the oblique lock tongue (15). The second lock cylinder (30) is provided with a third dial (31), which is driven by the second key (91) and can be used to extend and retract the lower lock tongue (13); The safety latch (14) is driven by a safety knob (141) provided on the housing (10), which can be used to extend and retract the safety latch (14); the oblique latch (15) is provided with an elastic element (151) for extending it.

2. The double-lock cylinder fireproof and burglarproof door lock according to claim 1, characterized in that: The lower locking tongue (13) is equipped with a deadbolt plate (60). The third dial (31) can drive the deadbolt plate (60) to move into the deadbolt state, thereby preventing the lower locking tongue (13) from retracting. When the deadbolt plate (60) enters the deadbolt state, neither the first lock cylinder (20) nor the inner handle mechanism (40) can release the deadbolt state.

3. The double-lock cylinder fireproof and burglarproof door lock according to claim 2, characterized in that: The inner handle mechanism (40) includes an inner handle (41), a first drive shaft (42) and a drive tube (43). The inner handle (41) can drive the drive tube (43) to rotate through the first drive shaft (42). The transmission tube (43) is connected in sequence from the outside to the inside to the first linkage component (44), the second linkage component (45), the third linkage component (46) and the fourth linkage component (47). The first linkage component (44) can be linked with the first dial (21) and the inner handle (41) respectively, so that the main locking tongue (11), the upper locking tongue (12) and the oblique locking tongue (15) retract; The second linkage component (45) can be linked with the first dial (21) and the second dial (22) respectively to extend the main locking tongue (11) and the upper locking tongue (12), and can be linked with the inner handle (41) to extend and retract the main locking tongue (11) and the upper locking tongue (12); The third linkage component (46) can be linked with the inner handle (41) to extend and retract the lower locking tongue (13); The fourth linkage component (47) can be linked with the second dial (22) and the inner handle (41) respectively, and drive the first linkage component (44), the second linkage component (45) and the third linkage component (46) to move, so that the main locking tongue (11), the upper locking tongue (12), the lower locking tongue (13), the safety locking tongue (14) and the oblique locking tongue (15) retract.

4. The double-lock cylinder fireproof and burglarproof door lock according to claim 3, characterized in that: The main latch (11) is equipped with a main connecting plate (111) and a main lever (112). The main connecting plate (111) is connected to the main latch (11) and is provided with a first horizontal groove (1111), a first inclined groove (1112) and a first lever (1113). The main lever (112) is hinged to the housing (10) through a first hinge shaft (119) and is provided with a second lever (1121) located in the first inclined groove (1112). The first hinge shaft (119) is located in the first horizontal groove (1111). The first linkage component (44) and the second linkage component (45) can both drive the main lever (112) to rotate. The upper locking tongue (12) is equipped with an upper connecting plate (121), an upper lever (122), and a top rod (123). The upper connecting plate (121) is connected to the upper locking tongue (12) and has a second horizontal groove (1211) and a third lever (1212). The upper lever (122) is hinged to the housing (10) through a second hinge shaft (129) and has a first vertical groove (1221) and a first arc groove (1222). The second hinge shaft (129) is located in the second horizontal groove (1211), and the third lever (1212) is located in the first vertical groove (1221). The top rod (123) has a second inclined groove (1231) and a fourth lever (1232). The first lever (1113) is located in the second inclined groove (1231), and the fourth lever (1232) is located in the first arc groove (1222). The lower locking tongue (13) is equipped with a lower connecting plate (131) and a lower lever (132). The lower connecting plate (131) is connected to the lower locking tongue (13) and has a third horizontal groove (1311) and a third oblique groove (1312) on it. The lower lever (132) is hinged to the housing (10) through a third hinge shaft (139) and has a fifth lever (1321) on it. The fifth lever (1321) is located in the third oblique groove (1312), and the third hinge shaft (139) is located in the third horizontal groove (1311). The third linkage assembly (46) can drive the lower lever (132) to rotate. The safety latch (14) is located at one end of the housing (10) and connected to a safety connecting plate (142). The safety connecting plate (142) is provided with a fourth transverse groove (143) and a first actuating port (144). The housing (10) is provided with a limiting shaft (145) and a fourth dial wheel (146). The limiting shaft (145) is located in the fourth transverse groove (143). The fourth dial wheel (146) is hinged to the housing (10) and connected to the safety knob (141) through a second transmission shaft (147). The fourth dial wheel (146) is provided with a transmission plate (148) and a boss (1461). The boss (1461) extends into the first actuating port (144). The fourth linkage component (47) can actuate the transmission plate (148) to rotate so that the boss (1461) drives the safety latch (14) to retract. The oblique locking tongue (15) is equipped with a connecting rod (152), and the housing (10) is provided with an abutment plate (153). The elastic element (151) is sleeved on the outside of the connecting rod (152) and abuts between the oblique locking tongue (15) and the abutment plate (153) so that the oblique locking tongue (15) extends out. The end of the connecting rod (152) away from the oblique locking tongue (15) is provided with a movable plate (154). The first linkage component (44) can move the movable plate (154) to retract the oblique locking tongue (15).

5. The double-lock cylinder fireproof and burglarproof door lock according to claim 4, characterized in that: The first linkage assembly (44) includes a first rotating plate (441), a first linkage plate (442), and a first rotating plate (443); the first rotating plate (441) is sleeved on the transmission tube (43) and is provided with a toggle head (4411) for toggling the movable plate (154); the top of the first linkage plate (442) is hinged to the side of the first rotating plate (441), the middle part is hinged to the first rotating plate (443), and the bottom is used to abut against the first dial wheel (21); the first rotating plate (443) is hinged to the housing (10) through the first hinge shaft (119), and the main dial (112) is provided with an abutment shaft (1122) that can abut against the first rotating plate (443). The second linkage component (45) includes a second rotating plate (451) and a second linkage plate (452); the second rotating plate (451) is sleeved on the transmission tube (43) and hinged to the top of the second linkage plate (452); the middle part of the second linkage plate (452) is hinged to the main lever (112); and its bottom can abut against the first lever (21) and the second lever (22). The third linkage assembly (46) includes a third rotating plate (461), a third linkage plate (462), and a gear (463); the third rotating plate (461) is sleeved on the transmission tube (43) and hinged to the top of the third linkage plate (462); the bottom of the third linkage plate (462) is provided with a first transmission tooth (4621), the first transmission tooth (4621) meshes with the gear (463), the gear (463) is hinged to the housing (10), and the lower paddle (132) is provided with a second transmission tooth (1322) meshing with the gear (463). The fourth linkage assembly (47) includes a fourth rotating plate (471) and a fourth linkage plate (472); the fourth rotating plate (471) is sleeved on the transmission tube (43) and hinged to the top of the fourth linkage plate (472); the fourth linkage plate (472) has an abutting edge (4721) in the middle that can abut against the second dial wheel (22), and a hook (4722) at its bottom that can hook the transmission plate (148); the fourth rotating plate (471) has a first protrusion (4711) and a second protrusion (4712); the first rotating plate (441) has a first shoulder (4412); the third rotating plate (461) has a second shoulder (4611); the first protrusion (4711) can abut against the first shoulder (4412); and the second protrusion (4712) can abut against the second shoulder (4611).

6. The double-lock cylinder fireproof and burglarproof door lock according to claim 5, characterized in that: The transmission tube (43) has four abutting planes (431) on its outer side. The inner rings of the first rotating plate (441), the second rotating plate (451), the third rotating plate (461) and the fourth rotating plate (471) are all provided with four abutting protrusions. The upper edge of the abutting protrusion on the right side of the first rotating plate (441) and the fourth rotating plate (471) abuts against the abutting plane (431) on the right side. The lower edge of the abutting protrusion on the right side of the second rotating plate (451) and the third rotating plate (461) abuts against the abutting plane (431) on the right side.

7. The double-lock cylinder fireproof and burglarproof door lock according to claim 5, characterized in that: The lower connecting plate (131) is provided with a limiting pin (1313). The anti-locking plate (60) is hinged to the third hinge shaft (139). It is provided with a slot (601), a second actuating port (602) and an actuating edge (603). The third dial wheel (31) can extend into the second actuating port (602) to rotate the anti-locking plate (60). When the lower connecting plate (131) is extended, the third dial wheel (31) can also abut against the actuating edge (603) to rotate the anti-locking plate (60) further so that the limiting pin (1313) cooperates with the slot (601).

8. The double-lock cylinder fireproof and burglarproof door lock according to claim 7, characterized in that: The lower paddle (132) is also provided with a third actuation port (1323), and the third dial (31) can be inserted into the third actuation port (1323) to actuate the lower paddle (132) to rotate.

9. The double-lock cylinder fireproof and burglarproof door lock according to any one of claims 3 to 7, characterized in that: It also includes an outer handle (92), an outer panel (93), and a power supply. The outer handle (92) is located on the outer panel (93), which is used to connect to the door. It is provided with a first lock hole, a second lock hole, and a human-machine interaction module (94). The first lock hole corresponds to the first lock cylinder (20), and the second lock hole corresponds to the second lock cylinder (30). A motor (70) is also provided between the inner handle (41) and the transmission tube (43). The motor (70) can drive the transmission tube (43) to rotate. The human-machine interaction module (94) is electrically connected to the motor (70). The power supply is used to supply power to the human-machine interaction module (94) and the motor (70).

10. The double-lock cylinder fireproof and burglarproof door lock according to claim 9, characterized in that: The inner handle mechanism (40) also includes an inner panel (48) for connecting to the door. The motor (70) is located inside the inner panel (48). The inner handle (41), the inner knob (50) and the safety knob (141) are all located outside the inner panel (48). The inner panel (48) is also provided with a third lock hole corresponding to the second lock cylinder (30).

Images