Mechanical lock

Abstract

The utility model discloses a mechanical lockset which comprises a lock cylinder used for being twisted in cooperation with a key, a transmission portion mechanically matched with the lock cylinder and a spring bolt matched with the transmission portion, an electronic alarm portion is arranged on the transmission portion, and a trigger portion electrically connected with the electronic alarm portion is arranged on the spring bolt. And when the spring bolt is matched with the door frame and is not locked with the door frame, the trigger part triggers the electronic alarm part to give out a prompt. Through cooperation of the trigger part and the electronic alarm part, alarm monitoring can be carried out when a door provided with the mechanical lock is opened and needs to be closed on a door frame, a prompt is given out in time when a spring bolt is not locked with the door frame, people are reminded that the door is not closed well in time till the door is completely locked with the door frame, and the safety of the lock is greatly improved; and better protection is provided for a user.

Description

Technical Field

[0001] The utility model relates to a mechanical lock. Background Art

[0002] As a traditional lock, mechanical lock has a long history and wide application. Mechanical lock is a device that can be locked and unlocked by physical means. It is widely used in homes, offices, shops, warehouses and other places to protect property and privacy.

[0003] Mechanical locks are based on the matching of keys and lock cylinders. When the key is correctly inserted into the lock cylinder and rotated, the teeth on the key will match the gears inside the lock cylinder. Through a series of complex mechanical structure functions, the lock tongue will eventually retract and the door will be opened. The structure of existing mechanical locks usually consists of a lock body, a lock tongue, a key and a lock cylinder. The lock cylinder is the core component that determines the opening method and security of the lock.

[0004] However, existing mechanical locks have some disadvantages. After people open the door, take out the key and close the door, the lock tongue can easily fail to lock the door properly due to foreign objects in the door gap or the lock tongue not completely locking the door, resulting in other unnecessary losses or safety risks. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a mechanical lock to solve the problem that the lock tongue is not tightly connected to the door frame when the door is closed.

[0006] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a mechanical lock including a lock core for twisting in cooperation with a key, a transmission part mechanically cooperating with the lock core and a lock tongue cooperating with the transmission part, an electronic alarm part is arranged on the transmission part, and a trigger part electrically connected to the electronic alarm part is provided on the lock tongue, when the lock tongue cooperates with the door frame but is not locked with the door frame, the trigger part triggers the electronic alarm part to issue a prompt to remind people that the door is not closed, so that people can find out in time and close the door, avoiding bad influence caused by the door not being closed properly.

[0007] Furthermore, the lock core includes a lock shell, an inner lock core sleeve rotatably arranged in the lock shell, a pin structure arranged between the inner lock core sleeve and the lock shell for limiting the rotation of the inner lock core sleeve, and an outer lock core sleeve rotatably arranged outside the inner lock core sleeve, and the transmission part cooperates with the outer lock core sleeve so that when an adapted key is inserted into the inner lock core sleeve, the inner lock core sleeve can rotate to cooperate with the transmission part.

[0008] Furthermore, the outer lock cylinder sleeve extends to the outside of the lock shell away from the inner lock cylinder sleeve, and the transmission part includes a gear that is coaxial with and fixedly connected to the inner lock cylinder sleeve, an internal hollow shell for installation in the door, and a sliding rod with one end slidingly inserted into the inner cavity of the shell, and a sliding bar is formed on the other end of the sliding rod along its axial extension and is located on the side of the gear, and a rack that meshes with the gear is distributed along its axial direction on the side of the sliding bar facing the gear, and the electronic alarm part is installed in the shell, and the lock tongue is axially slidably arranged in the shell and has one end connected to the sliding rod and the other end that can pass out of the shell. When the key is used to rotate the outer lock cylinder sleeve, the gear directly meshes with the rack to make the sliding bar slide so that the lock tongue can exit the door frame.

[0009] Furthermore, a support frame is fixedly connected to the lock housing, and a sliding space is provided on the support frame to cooperate with the sliding support of the sliding bar, thereby improving the stability between the lock core and the sliding bar and ensuring the meshing of the gear and the rack.

[0010] When the slide bar slides toward the side away from the lock tongue in cooperation with the gear and the rack, the locking end of the lock tongue retracts into the through hole under the action of the spring and releases the cooperation with the door frame.

[0011] Furthermore, a convex bump is provided in the sliding cavity toward one side of the lock tongue, the lock tongue is movably arranged in the sliding cavity and slidably cooperates with the convex bump, and the two ends of the spring are respectively connected to the abutting end and the convex bump to reduce the friction between the lock tongue and the inner wall of the sliding cavity.

[0012] Furthermore, the electronic alarm unit includes a power supply detachably installed in the shell and a control alarm installed in the shell and electrically connected to the power supply. The trigger unit is electrically connected to the control alarm. When the locking end of the lock tongue contacts the door frame but is not tightly locked with the door frame, the control alarm emits a sound prompt to promptly remind people that the door is not closed.

[0013] Furthermore, the electronic alarm part also includes a metal sheet embedded in the inner wall of the perforation and electrically connected to the control alarm, and a metal spring sheet fixed on the lock tongue and electrically connected to the trigger part. The metal sheet is arranged along the axial direction of the perforation and is located within the sliding range of the metal spring sheet. The metal spring sheet is pressed against the metal sheet so that the trigger part and the control alarm always maintain electrical connection.

[0014] Furthermore, the lock tongue has an abutting surface that abuts against the door frame, and the trigger part includes a trigger block installed on the lock tongue and movable through the abutting surface, and a torsion spring arranged between the trigger block and the lock tongue. When the abutting surface does not abut against the door frame after contacting the door frame for a certain period of time, the control alarm is triggered to emit a prompt sound, so as to realize the opening and closing of the control alarm through the cooperation of the trigger block and the door frame.

[0015] Furthermore, a receiving groove is provided on the lock tongue and axially passes through the abutment surface. The trigger block is hinged in the receiving groove and is squeezed by the torsion spring outside the receiving groove when no force is applied. The trigger part also includes a first sensor arranged on the abutment surface and electrically connected to the metal spring sheet and a second sensor arranged in the receiving groove and electrically connected to the metal spring sheet. When the lock tongue contacts the door frame, the first sensor sends a signal and the second sensor is started. When the trigger block rotates into the receiving groove, the second sensor is turned off. Therefore, when closing the door, the first sensor sends a signal to the control alarm to start the second sensor. After a certain period of time after the second sensor is started, the second sensor contacts the trigger block, indicating that the lock tongue has been locked with the door frame and the second sensor is turned off. If the trigger block does not contact the second sensor within a certain period of time after the second sensor is started, it indicates that the lock tongue is not locked with the door frame. At this time, the second sensor sends a signal to the control alarm, and the control alarm sends a prompt sound to ensure that the closing prompt is carried out in time.

[0016] A mechanical lock of the utility model has at least the following beneficial effects: through the cooperation of the trigger part and the electronic alarm part, an alarm monitoring can be performed when the door installed with the mechanical lock is opened and needs to be closed to the door frame, and a prompt is issued in time when the lock tongue is not locked with the door frame, so as to remind people in time that the door is not closed properly until the door is completely locked with the door frame, thereby greatly improving the safety of the lock and providing better protection for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of the mechanical lock of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the mechanical lock of the utility model from another angle;

[0020] Figure 3 It is a cross-sectional view of the mechanical lock of the utility model;

[0021] Figure 4 It is a cross-sectional view of the transmission part, the lock tongue and the trigger part of the utility model;

[0022] Figure 5 for Figure 4 An enlarged schematic diagram of part A is shown.

[0023] The meanings of the symbols in the accompanying drawings are:

[0024] Lock cylinder-1; lock shell-11; inner lock cylinder sleeve-12; outer lock cylinder sleeve-13; support frame-14; transmission part-2; gear-21; shell-22; perforation-221; sliding cavity-222; convex bump-223; slide rod-23; slide bar-231; rack-232; lock tongue-3; abutment end-31; spring-32; locking end-33; abutment surface-34; storage slot-35; electronic alarm part-4; power supply-41; control alarm-42; trigger part-43; trigger block-431; second sensor-432; metal sheet-44; metal spring sheet-45. DETAILED DESCRIPTION

[0025] The utility model will be further described below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 5 As shown, a mechanical lock of the utility model includes a lock core 1 for twisting in cooperation with a key, a transmission part 2 mechanically cooperating with the lock core 1, a lock tongue 3 cooperating with the transmission part 2, and an electronic alarm part 4 arranged on the transmission part 2. When in use, the key cooperating with the lock core 1 is inserted into the lock core 1 and rotated, and the lock tongue 3 is driven to extend or retract through the transmission cooperation between the transmission part 2 and the lock core 1, so that it can be locked or unlocked with the door frame. The electronic alarm part 4 is used to monitor the locking condition of the lock tongue 3 when the door and the door frame are closed, so as to send a prompt sound when the door lock is not locked to inform the user that the door is not closed properly.

[0027] In this embodiment, the lock cylinder 1 comprises a lock housing 11, an inner lock cylinder 1 sleeve rotatably arranged in the lock housing 11, a pin structure (not shown in the figure) arranged between the inner lock cylinder 1 sleeve and the lock housing 11 for limiting the rotation of the inner lock cylinder 1 sleeve, and an outer lock cylinder 1 sleeve rotatably arranged outside the inner lock cylinder 1 sleeve, and the outer lock cylinder 1 sleeve extends to the side of the lock housing 11 away from the inner lock cylinder 1 sleeve. The pin structure is arranged in the inner cavity of the inner lock cylinder 1 sleeve, and the inner lock cylinder 1 sleeve has a lock bolt, and the end of the lock bolt has a keyhole, and a spring groove connected to the key channel is formed on the lock bolt, and the pin structure is installed in the spring groove, and the spring is located in the spring groove on the inner lock cylinder 1 sleeve, and the pin is located in the slide groove. When the key is inserted into the lock bolt through the keyhole, the key contacts the pins of different lengths so that the lock bolt can rotate. The lock bolt is connected to the outer lock cylinder 1 sleeve, so that the lock bolt drives the outer lock cylinder 1 sleeve to rotate. The specific structure of the lock core 1 is prior art and will not be described here. Preferably, a support frame 14 is fixedly connected to the lock housing 11, and the support frame 14 includes two connecting rods fixedly connected to the outer wall of the outer lock core 1 sleeve, a V-shaped V-shaped bar mounted on the outer lock core 1 sleeve and connected to the two connecting rods at both ends, a vertical rod is fixedly connected to the middle of the V-shaped bar, and a head with a diameter or width greater than the vertical rod is provided at one end of the vertical rod away from the V-shaped bar, and a sliding space that slides with the transmission part 2 is formed between the head and the V-shaped bar to provide support for the transmission part 2.

[0028] In this embodiment, the transmission part 2 includes a gear 21 coaxial with and fixedly connected to the inner lock cylinder 1, an inner hollow shell 22 for installation in the door, and a slide bar 23 with one end slidingly inserted into the inner cavity of the shell 22. A slide bar 231 extending along its axial direction and located on the side of the gear 21 is formed on the other end of the slide bar 23. A rack 232 meshing with the gear 21 is distributed along its axial direction on the side of the slide bar 231 facing the gear 21. The slide bar 231 and the rack 232 are slidably inserted into the sliding space. When in use, when the outer lock cylinder 1 is rotated by using a key, the gear 21 can be driven to rotate so that the transmission part 2 can be matched with the outer lock cylinder 1. The shell 22 facilitates the mutual cooperation between the slide bar 23 and the lock tongue 3, and the transmission is realized by the transmission meshing of the rack 232 on the slide bar 231 with the gear 21. The gear 21 is connected to the end of the inner lock cylinder 1 sleeve that passes through the outer lock cylinder 1 sleeve and is coaxially distributed, so that the gear 21 can rotate with the inner lock cylinder 1 sleeve and cooperate with the rack 232. The outer shell 22 has a cylindrical sliding cavity 222, one end of the slide rod 23 slides into the sliding cavity 222 and is coaxially arranged with the sliding cavity 222, and the end of the slide rod 23 that passes into the outer shell 22 is a cylindrical structure, so as to slide and cooperate with the outer shell 22 to reduce friction; the end of the slide rod 23 that passes through the outer shell 22 is defined as a sliding bar 231, and the sliding bar 231 is a rectangular parallelepiped structure, and the rack 232 is fixedly connected to the side surface of the sliding bar 231 facing the gear 21 and is always meshed with the gear 21. When the rack 232 and the gear 21 rotate with the key, the gear 21 meshes from one end of the rack 232 to the other end of the rack 232, thereby realizing the axial movement of the slide rod 23.

[0029] In this embodiment, one end of the lock tongue 3 is movably arranged in the sliding cavity 222 along the axial direction of the sliding cavity 222 and can be connected to the sliding rod 23. Of course, there can be no connection between the lock tongue 3 and the sliding rod 23, but they can only be arranged to abut against each other. The sliding cavity 222 penetrates the inner wall of one side away from the sliding rod 23 along the axial direction, so that the other end of the lock tongue 3 can pass out of the housing 22. In the content defined in this embodiment, the end of the lock tongue 3 that is pressed against the sliding rod 23 is defined as the abutting end 31, and the other end is limited as the locking end 33 for locking with the door frame. The lock tongue 3 is slidably arranged in the sliding cavity 222 and abuts against the sliding rod 23. A spring 32 is sleeved on the lock tongue 3, and its two ends are respectively connected to the lock tongue 3 and the inner wall of the sliding cavity 222. The end of the sliding cavity 222 away from the sliding bar 231 has a through hole 221 for the locking end 33 of the lock tongue 3 to pass through the housing 22. The through hole 221 is limited to the open side of the sliding cavity 222 passing through the housing 22 away from the sliding rod 23. A stop block extending along the direction of the sliding cavity 222 is provided on the abutting end 31 of the lock tongue 3. One end of the spring 32 is connected to the stop block. A convex bulge 223 is convexly arranged in the sliding cavity 222 toward one side of the lock tongue 3. The lock tongue 3 is movably arranged in the sliding cavity 222 and slidably cooperates with the convex bulge 223 to reduce the contact area between the lock tongue 3 and the sliding cavity 222, and to reduce friction while maintaining support for the lock tongue 3. The two ends of the spring are respectively connected to the abutting end 31 and the convex bulge 223. When the locking end 33 of the lock tongue 3 passes through the through hole 221, the gear 21 is meshed with the end of the rack 232 away from the sliding bar 231, and part of the sliding bar 231 is passed into the sliding cavity 222. The spring 32 is in a normal state. If the lock tongue 3 cooperates with the door frame at this time, it can be used to lock the door frame to lock the door; when the locking end 33 is located in the through hole 221, the spring 32 is in a compressed state, and the gear 21 is meshed with the end of the rack 232 close to the sliding bar 231. Such a simple and practical mechanical structure can achieve the closing of the door.

[0030] In this embodiment, the electronic alarm unit 4 includes a power supply 41 detachably installed in the housing 22, a control alarm 42 installed in the housing 22 and electrically connected to the power supply 41, a trigger unit 43 arranged on the lock tongue 3 and electrically connected to the control alarm 42, a metal sheet 44 embedded in the inner wall of the perforation 221 and electrically connected to the control alarm 42, and a metal spring 45 fixedly arranged on the lock tongue 3 and electrically connected to the trigger unit 43. The metal spring 45 is pressed against the metal sheet 44, and the power supply 41 provides power to the control alarm 42 and the trigger unit 43. When the metal sheet 44 and the metal spring 45 enable the trigger unit 43 on the lock tongue 3 to maintain the transmission of electrical signals with the control alarm 42, and the locking end 33 of the lock tongue 3 is in contact with the door frame but is not tightly locked with the door frame, the trigger unit 43 triggers the control alarm 42 of the electronic alarm unit 4 to emit a sound prompt to remind the user to check and close the door lock until the locking end 33 of the lock tongue 3 completes the locking with the door frame, and the control alarm 42 stops emitting the prompt sound.

[0031] In the content defined in this embodiment, the power supply 41 includes a battery box and a lithium battery, so that it can be replaced immediately when the power supply 41 is exhausted and provide power to the control alarm 42 and the trigger part 43. The control alarm 42 includes a single chip microcomputer installed on the housing 22 and electrically connected to the power supply 41, and a sound alarm such as a buzzer electrically connected to both the power supply 41 and the single chip microcomputer. The trigger part 43 is electrically connected to the power supply 41 and the single chip microcomputer respectively through the cooperation between the metal sheet 44 and the metal spring sheet 45, so that the trigger part 43 can send a signal to the single chip microcomputer by detecting the cooperation between the lock tongue 3 and the door frame, so that the single chip microcomputer can control the operation of the sound alarm in time. The metal sheet 44 can be a cylindrical structure and cover the inner wall of the through hole 221 to be arranged along the axial direction of the through hole 221. A groove is concavely provided on the side wall of the lock tongue 3, and the metal spring 45 is fixedly installed in the groove. The metal spring 45 is in an inclined sheet structure and gradually narrows toward the side of the slide bar 23 toward the inner wall of the through hole 221, and the metal spring 45 passes out of the groove toward the side of the through hole 221 and is pressed against the metal sheet 44 on the inner wall of the through hole 221. Within the moving range of the lock tongue 3, the metal spring 45 has a sliding range as the lock tongue 3 moves, and the sliding range of the metal spring 45 is always located in the metal sheet 44, so that the metal spring 45 can always be pressed against the metal sheet 44. The metal sheet 44 is connected to the power supply 41 and the single-chip computer through a cable.

[0032] In this embodiment, the lock tongue 3 has an abutting surface 34 abutting against the door frame, and the abutting surface 34 is preferably an inclined surface facing one side of the door frame in the use environment, so that the locking end 33 of the lock tongue 3 can still be retracted into the sliding cavity 222 under pressure after the key is taken out. The triggering part 43 includes a triggering block 431 installed on the lock tongue 3 and movably passing through the abutting surface 34, a torsion spring arranged between the triggering block 431 and the lock tongue 3, a first sensor arranged on the abutting surface 34 and electrically connected to the metal spring 45, and a second sensor 432 arranged in the receiving groove 35 and electrically connected to the metal spring 45. When the abutting surface 34 does not abut against the door frame after contacting the door frame for a certain period of time, the control alarm 42 is triggered to emit a prompt sound. In the content defined in this embodiment, a receiving groove 35 is provided on the lock tongue 3, which axially penetrates the abutting surface 34. One side of the trigger block 431 is hinged in the receiving groove 35 by a hinge. The other side of the trigger block 431 can be completely located in the receiving groove 35, and can also be squeezed by the torsion spring and located outside the receiving groove 35 when not under force. The torsion spring is arranged on the inner wall diameter of the trigger block 431 and the receiving groove 35. The two torsion arms of the torsion spring are respectively connected to the trigger block 431 and the inner wall of the receiving groove 35. The torsion spring is in a contracted state when the trigger block 431 is located in the receiving groove 35, and is in a normal state when the trigger block 431 is located outside the receiving groove 35. A sensor is arranged on the outer wall of the lock tongue 3 end of the lock tongue 3, and the sensor can be a light sensor or a proximity switch. The second sensor 432 is fixedly embedded in the inner wall of the receiving groove 35. When in use, first make the lock tongue 3 installed on the door close to the door frame. When the first sensor contacts the door frame, it means that the door is located in the door frame and the lock tongue 3 is close to the lock hole on the door frame. The first sensor can detect that the lock tongue 3 is close to the lock hole and sends a signal to the single-chip microcomputer. The single-chip microcomputer controls the second sensor 432 to start. When the locking end 33 of the lock tongue 3 is tightly inserted into the lock hole, the trigger block 431 is squeezed and rotated to the storage groove 35 and close to the second sensor 432. After the second sensor 432 detects that the trigger block 431 contacts it, it sends a signal to the single-chip microcomputer, and the second sensor 432 and the sound alarm are turned off, or only the sound alarm is turned off; if the lock tongue 3 is not completely closed, the trigger block 431 will not enter the storage groove 35 completely or will not enter the storage groove 35 at all. When the second sensor 432 does not sense the contact of the trigger block 431 within a certain period of time, such as within 10s, it sends a signal to the single-chip microcomputer, and the single-chip microcomputer controls the sound alarm to emit a prompt sound until the door is completely closed.

[0033] The working method of one embodiment of a mechanical lock of the utility model is as follows: when opening the door, the matching key is inserted into the lock hole into the inner lock core 1 sleeve and rotated to drive the inner lock core 1 sleeve to rotate and drive the outer lock core 1 sleeve to rotate, and the gear 21 on the inner lock core 1 sleeve rotates accordingly to drive the rack 232 to move, so that the locking end 33 is retracted into the through hole 221, and then the key is taken out and the door is closed, so that the locking end 33 of the lock tongue 3 enters the lock hole.

Claims

1. A mechanical lock, comprising a lock core for twisting in cooperation with a key, a transmission part mechanically cooperating with the lock core, and a lock tongue cooperating with the transmission part, characterized in that: An electronic alarm part is arranged on the transmission part, and a trigger part electrically connected to the electronic alarm part is arranged on the lock tongue. When the lock tongue cooperates with the door frame but is not locked with the door frame, the trigger part triggers the electronic alarm part to issue a prompt.

2. A mechanical lock according to claim 1, characterized in that: The lock core includes a lock housing, an inner lock core sleeve rotatably arranged in the lock housing, a pin structure arranged between the inner lock core sleeve and the lock housing for limiting the rotation of the inner lock core sleeve, and an outer lock core sleeve rotatably arranged outside the inner lock core sleeve, and the transmission part cooperates with the outer lock core sleeve.

3. A mechanical lock according to claim 2, characterized in that: The outer lock cylinder sleeve extends to the outside of the lock shell away from the inner lock cylinder sleeve. The transmission part includes a gear coaxial with and fixedly connected to the inner lock cylinder sleeve, an internal hollow shell for installation in the door, and a sliding rod with one end slidingly inserted into the inner cavity of the shell. A sliding bar is formed on the other end of the sliding rod along its axial extension and is located on the side of the gear. A rack meshing with the gear is distributed along its axial direction on the side of the sliding bar facing the gear. The electronic alarm part is installed in the shell. The lock tongue is axially slidably arranged in the shell and has one end connected to the sliding rod and the other end can pass through the outside of the shell.

4. A mechanical lock according to claim 3, characterized in that: A support frame is fixedly connected to the lock shell, and a sliding space cooperating with the sliding support of the sliding bar is provided on the support frame.

5. A mechanical lock according to claim 3, characterized in that: The lock tongue has an abutting end that is always pressed against the sliding rod and a locking end that is used to lock with the door frame; a sliding cavity is provided in the shell that is coaxially arranged with the sliding rod, one end of the sliding rod is axially slidably penetrated in the sliding cavity, the lock tongue is slidably penetrated in the sliding cavity and abuts against the sliding rod, a spring is sleeved on the lock tongue, and its two ends are respectively connected to the lock tongue and the inner wall of the sliding cavity, and a through hole is provided on the end of the sliding cavity away from the sliding bar for the locking end of the lock tongue to pass through the shell, when the locking end of the lock tongue passes through the through hole, the spring is in a normal state, and when the locking end is located in the through hole, the spring is in a compressed state.

6. A mechanical lock according to claim 5, characterized in that: A convex bump is provided in the sliding cavity toward one side of the locking tongue. The locking tongue is movably arranged in the sliding cavity and slidingly cooperates with the convex bump. Two ends of the spring are respectively connected to the abutting end and the convex bump.

7. A mechanical lock according to claim 3, characterized in that: The electronic alarm unit includes a power supply detachably installed in the shell and a control alarm installed in the shell and electrically connected to the power supply. The trigger unit is electrically connected to the control alarm. When the locking end of the lock tongue contacts the door frame but is not tightly locked with the door frame, the control alarm emits a sound prompt.

8. A mechanical lock according to claim 7, characterized in that: The electronic alarm part also includes a metal sheet embedded in the inner wall of the perforation and electrically connected to the control alarm, and a metal spring sheet fixedly arranged on the lock tongue and electrically connected to the trigger part. The metal sheet is arranged along the axial direction of the perforation and is located within the sliding range of the metal spring sheet, and the metal spring sheet is pressed against the metal sheet.

9. A mechanical lock according to claim 8, characterized in that: The lock tongue has an abutting surface that abuts against the door frame. The trigger part includes a trigger block installed on the lock tongue and movable through the abutting surface, and a torsion spring arranged between the trigger block and the lock tongue. When the abutting surface does not abut against the door frame after contacting the door frame for a certain period of time, the control alarm is triggered to emit a prompt sound.

10. A mechanical lock according to claim 9, characterized in that: A receiving groove is provided on the lock tongue and axially penetrates the abutment surface. The trigger block is hinged in the receiving groove and is squeezed by the torsion spring outside the receiving groove when no force is applied. The trigger part also includes a first sensor arranged on the abutment surface and electrically connected to the metal spring sheet and a second sensor arranged in the receiving groove and electrically connected to the metal spring sheet. When the lock tongue contacts the door frame, the first sensor sends a signal and the second sensor is activated. When the trigger block rotates into the receiving groove, the second sensor is closed.

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