Safety door lock

Abstract

The invention relates to a safety door lock, and relates to the technical field of door locks. The safety door lock comprises an installation frame used for being installed on a door body, a spring bolt and an unlocking frame are arranged on the installation frame, and the safety door lock is characterized in that a self-locking mechanism is further arranged on the installation frame and comprises a self-locking frame and a self-locking assembly, the self-locking frame is rotationally connected with the installation frame, and the self-locking assembly is arranged on the self-locking frame. One end of the self-locking frame extends in the direction of the spring bolt and is located on the rotating path of the spring bolt, and the self-locking assembly is used for driving the self-locking frame to rotate when the door body is closed, so that the self-locking frame is located on the rotating path of the spring bolt after rotating. The method has the effect that the probability of driving the spring bolt to rotate outside the door in the mode that a non-orbital molecule picks the lock through a card is reduced.

Description

Technical Field

[0001] This application relates to the technical field of door locks, and particularly to a safety door lock. Background Art

[0002] With the continuous development of the social economy and the increasing improvement of the scientific and technological level, people's safety awareness is also constantly increasing. As a mechanism for locking the door body to the door frame or wall, the door lock can effectively prevent lawless elements from opening the door body and plays an important role in people's daily lives.

[0003] There is a safety door lock in the prior art, which includes an installation frame for installing on the door body, and a lock tongue is also provided on the installation frame. The middle of the lock tongue is rotatably connected to the installation frame, and one side extends out of the safety door lock and reaches the lock groove of the door frame. An unlocking handle and an unlocking mechanism are also provided on the installation frame, and an unlocking frame is provided on the unlocking handle. The unlocking frame is rotatably connected to the installation frame. The unlocking handle drives the lock tongue to rotate through the unlocking mechanism, so that one side of the lock tongue rotates out of the lock groove of the door frame. When in use, the user rotates the unlocking handle, and the unlocking handle drives the lock tongue to rotate through the unlocking mechanism, so that the lock tongue rotates out of the lock groove to realize the unlocking between the door body and the door frame.

[0004] Regarding the above related technology, when lawless elements want to enter the door, they often insert a card into the gap between the door body and the door frame. After the card abuts against the outer wall of the lock tongue, by moving the card, the end of the card is used to push the lock tongue to rotate, so that the lock tongue rotates out of the lock groove on the door frame, and the door body and the door frame are pried open. This increases the probability of lawless elements opening the door by prying the lock, thereby reducing the security of the door lock. Summary of the Invention

[0005] In order to reduce the probability of lawless elements driving the lock tongue to rotate outside the door by prying the lock with a card, this application provides a safety door lock.

[0006] A safety door lock provided by this application adopts the following technical solution: A safety door lock includes an installation frame for installing on the door body. A lock tongue and an unlocking frame are provided on the installation frame. A self-locking mechanism is also provided on the installation frame. The self-locking mechanism includes a self-locking frame and a self-locking component. The self-locking frame is rotatably connected to the installation frame. One end of the self-locking frame extends towards the direction where the lock tongue is located and is located on the rotation path of the lock tongue. The self-locking component is used to drive the self-locking frame to rotate when the door body is closed, so that the self-locking frame is located on the rotation path of the lock tongue after rotation.

[0007] By adopting the above technical solution, compared with the prior art, in which miscreants can insert a card into the gap between the door body and the door frame and make the card push the lock tongue to rotate, prying the lock between the door body and the door frame, thereby increasing the probability that miscreants can open the door by prying the lock; in this application, through the setting of the self-locking mechanism, during the rotation of the installation frame with the door body, the self-locking component on the installation frame can drive the self-locking frame to rotate, so that the end of the self-locking frame can be located on the rotation path of the lock tongue after rotation. Thus, when the lock tongue rotates, the self-locking frame can prevent the lock tongue from continuing to rotate by abutting against the lock tongue, thereby realizing the self-locking of the lock tongue, effectively preventing miscreants from prying the lock by means of a card, etc., and further reducing the probability that miscreants drive the lock tongue to rotate outside the door by prying the lock with a card, reducing the probability that miscreants open the door by prying the lock, and improving the security of this application.

[0008] Preferably, the self-locking component includes a limit frame and an elastic member. The limit frame is slidably connected to the installation frame. One end of the limit frame extends outside the installation frame and is used to abut against the door frame. The other end of the limit frame extends to the side of the self-locking frame away from the lock tongue and abuts against the self-locking frame. The elastic member is used to, through its own elastic force, when the limit frame abuts against the door frame and slips, after the limit frame is separated from the self-locking frame, allow the self-locking frame to rotate, so that the self-locking frame is located on the rotation path of the lock tongue.

[0009] By adopting the above technical solution, the setting of the self-locking component enables the limit frame to gradually disengage from the self-locking frame after the limit frame abuts against the door frame and slips, thereby releasing the limit on the self-locking frame, enabling the self-locking frame to automatically rotate under the elastic force of the elastic member, so that the end of the self-locking frame can be displaced to the rotation path of the lock tongue, further realizing the drive of the rotation of the self-locking frame, effectively realizing the automatic rotation of the self-locking frame, and further ensuring the smooth abutment of the self-locking frame and the lock tongue, ensuring the use effect of this application.

[0010] Preferably, the self-locking mechanism further includes an abutting frame and a linkage member. The abutting frame is located on the side of the self-locking frame away from the lock tongue. The abutting frame is slidably connected to the installation frame, and the self-locking frame is located on the sliding path of the abutting frame. The limit frame drives the abutting frame to slide through the linkage member.

[0011] By adopting the above technical solution, the arrangement of the abutting frame and the linkage member enables that when the limiting frame abuts against the door frame and thus rotates, the limiting frame can drive the abutting frame to slide through the linkage member, and after the abutting frame abuts against the self-locking frame, it can push the self-locking frame to rotate, realizing the driving of the rotation of the self-locking frame. Furthermore, after the elastic member has been in use for a long time and the elastic force is insufficient to drive the self-locking frame to rotate to the designated position, the abutting frame can drive the self-locking frame to rotate normally by pushing, thus effectively ensuring the smooth use of the self-locking frame, guaranteeing the service life of this application, and at the same time reducing the probability that lawbreakers can open the door by picking the lock.

[0012] Preferably, a pushing frame is further arranged on the installation frame. The pushing frame is slidably connected to the installation frame. One end of the self-locking frame away from the lock tongue is located on the sliding path of the pushing frame.

[0013] By adopting the above technical solution, the arrangement of the pushing frame enables that when a person inside the door needs to open the door body equipped with the safety door lock of this application, they only need to push the pushing frame to make the pushing frame slide relative to the installation frame, and then the pushing frame can push the self-locking frame to rotate after abutting against one end of the self-locking frame, making the self-locking frame drive the lock tongue to rotate, and further making the lock tongue disengage from the lock slot on the door body, thus realizing the quick unlocking of this application inside the door and effectively facilitating the use of the user.

[0014] Preferably, the abutting frame includes a sliding frame and a switch frame. The sliding frame is slidably connected to the installation frame. The linkage member is used to drive the sliding frame to slide. The self-locking frame is located on the displacement path when the switch frame moves together with the sliding frame. The switch frame is slidably connected to the sliding frame, and the sliding direction is away from the self-locking frame. The pushing frame further extends a driving part towards the direction close to the sliding frame. The driving part drives the switch frame to slide away from the self-locking frame by abutting against the switch frame.

[0015] By adopting the above technical solution, the arrangement of the abutting frame enables that when the pushing frame slides together with the driving part, the driving part can push the switch frame to slide by abutting against the switch frame, and make the switch frame move away from the self-locking frame, so that the switch frame releases the abutment with the self-locking frame, enabling the subsequent pushing frame to smoothly drive the self-locking frame to rotate, realizing the smooth driving of the self-locking frame, effectively ensuring the unlocking and driving of the lock tongue, and at the same time facilitating the operation of the user.

[0016] Preferably, a transmission frame and a contact frame are further arranged on the installation frame. One end of the transmission frame is rotatably connected to the unlocking frame, and the other end is rotatably connected to the contact frame. The contact frame is slidably connected to the installation frame, and the switch frame is located on the sliding path of the contact frame.

[0017] By adopting the above technical solution, the arrangement of the transmission frame and the contact frame enables the unlocking frame to drive the transmission frame to displace when rotating, and further enables the transmission frame to drive the contact frame to slide, so that the contact frame drives the switch frame to slide during the sliding process, causing the switch frame to gradually move away from the self-locking frame, realizing the unlocking of the self-locking frame, and effectively ensuring the smooth driving of the unlocking frame to rotate the self-locking frame.

[0018] Preferably, the linkage member includes a linkage frame, one end of the linkage frame is rotatably connected to the limiting frame, and the other end is rotatably connected to the abutting frame.

[0019] By adopting the above technical solution, the arrangement of the linkage frame enables the limiting frame to drive the linkage frame to displace when the limiting frame rotates, and further enables the linkage frame to drive the abutting frame to slide, realizing the driving of the abutting frame to slide, thus realizing the linkage between the limiting frame and the abutting frame and the automatic sliding of the abutting frame.

[0020] Preferably, an abutting portion is further provided at one end of the limiting frame close to the self-locking frame, and the abutting portion is located on the rotation path of the lock tongue.

[0021] By adopting the above technical solution, the arrangement of the abutting portion enables the lock tongue to drive the abutting portion to displace by abutting against the abutting portion during the rotation of the lock tongue, and further enables the abutting portion and the limiting frame to slide together, so that the lock tongue and the limiting frame can retract into the installation frame together.

[0022] Preferably, the self-locking frame is located on the displacement path of one end of the lock tongue away from its rotation connection, and the lock tongue further extends a contact portion toward the side close to the self-locking frame, and the contact portion is located on the rotation path of the self-locking frame.

[0023] By adopting the above technical solution, the arrangement of the contact portion enables the end of the self-locking frame to abut against the contact portion when the self-locking frame rotates under the drive of the unlocking frame or the pushing frame, thereby driving the lock tongue to rotate, realizing the driving of the lock tongue to rotate, so that the lock tongue can smoothly retract into the installation frame, effectively facilitating the user to unlock the safety door lock of the present application.

[0024] Preferably, the self-locking frame further extends an unlocking portion outward, the unlocking frame is rotatably connected to the installation frame, the unlocking frame extends a abutting protrusion toward the direction close to the unlocking portion, and the abutting protrusion abuts against the unlocking portion.

[0025] By adopting the above technical solution, the arrangement of the unlocking part enables the abutting protrusion to abut against the unlocking part during the rotation with the unlocking frame, thereby driving the self-locking frame to rotate, further driving the rotation of the locking tongue, so that the locking tongue can smoothly retract into the installation frame, effectively facilitating the user to unlock the safety door lock of the present application.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The arrangement of the self-locking mechanism enables the self-locking component on the installation frame to drive the self-locking frame to rotate during the rotation of the installation frame with the door body, so that the end of the self-locking frame can be located on the rotation path of the locking tongue after rotation. Thus, when the locking tongue rotates, the self-locking frame can prevent the locking tongue from continuing to rotate by abutting against the locking tongue, thereby realizing the self-locking of the locking tongue, effectively preventing lawbreakers from picking the lock by means such as a card, and further reducing the probability that lawbreakers drive the locking tongue to rotate outside the door by picking the lock with a card, reducing the probability that lawbreakers open the door by picking the lock, and improving the safety of the present application; 2. The arrangement of the self-locking component enables the limiting frame to gradually disengage from the self-locking frame after abutting against the door frame and sliding, thereby releasing the limitation on the self-locking frame, enabling the self-locking frame to automatically rotate under the elastic force of the elastic member, so that the end of the self-locking frame can be displaced to the rotation path of the locking tongue, and further realizing the driving of the rotation of the self-locking frame, effectively realizing the automatic rotation of the self-locking frame, and further ensuring the smooth abutment of the self-locking frame and the locking tongue, ensuring the use effect of the present application; 3. The arrangement of the abutting frame and the linkage member enables the limiting frame to drive the abutting frame to slide through the linkage member when the limiting frame abuts against the door frame and rotates, and enables the abutting frame to drive the self-locking frame to rotate after abutting against the self-locking frame, realizing the driving of the rotation of the self-locking frame. Furthermore, when the elastic force is not sufficient to drive the self-locking frame to rotate to the specified position after the elastic member has been used for a long time, the abutting frame can drive the self-locking frame to rotate normally by pushing, effectively ensuring the smooth use of the self-locking frame, ensuring the service life of the present application, and at the same time reducing the probability that lawbreakers open the door by picking the lock. Description of the Drawings

[0027] Figure 1 is a schematic diagram showing the overall safety door lock in Embodiment 1 of the present application.

[0028] Figure 2 is a schematic diagram showing the structure of the self-locking frame in Embodiment 1 of the present application.

[0029] Figure 3 is a schematic diagram showing the structure of the self-locking part in Embodiment 1 of the present application.

[0030] Figure 4 It is a schematic diagram showing the state when the limiting frame retracts in Embodiment 1 of the present application.

[0031] Figure 5 It is a schematic diagram showing the overall safety door lock in Embodiment 2 of the present application.

[0032] Figure 6 It is a schematic diagram showing the structure of the pushing frame in Embodiment 2 of the present application.

[0033] Figure 7 It is a schematic diagram showing the structure of the abutting frame in Embodiment 2 of the present application.

[0034] Explanation of reference numerals: 1, mounting frame; 11, limiting groove; 2, lock tongue; 21, rotating shaft body; 211, reset torsion spring; 22, limiting rod; 23, contact part; 3, unlocking frame; 31, abutting protrusion; 4, self-locking mechanism; 41, self-locking frame; 411, self-locking part; 412, unlocking part; 42, self-locking component; 421, limiting frame; 4211, abutting part; 422, elastic member; 423, additional rod; 43, torsion spring; 44, abutting frame; 441, sliding frame; 4411, extending part; 442, switch frame; 45, linkage member; 451, linkage frame; 46, elastic spring; 5, relief cavity; 6, pushing frame; 61, driving part; 7, sliding groove; 8, transmission frame; 9, contact frame. Detailed implementation manners

[0035] The following further elaborates on the present application in conjunction with the attached Figure 1-7 for a more detailed description.

[0036] Embodiment 1: Embodiment 1 of the present application discloses a safety door lock. Refer to Figure 1 and Figure 2 , the safety door lock includes a mounting frame 1 for mounting on a door body, and a lock tongue 2 and an unlocking frame 3 are provided on the mounting frame 1. A self-locking mechanism 4 is further provided on the mounting frame 1, and the self-locking mechanism 4 includes a self-locking frame 41 and a self-locking component 42. The self-locking frame 41 is rotatably connected to the mounting frame 1. One end of the self-locking frame 41 extends towards the direction where the lock tongue 2 is located and is located on the rotation path of the lock tongue 2. The self-locking component 42 is used to drive the self-locking frame 41 to rotate when the door body is closed, so that the self-locking frame 41 is located on the rotation path of the lock tongue 2 after rotation.

[0037] Refer to Figure 1 and Figure 2, the mounting frame 1 is fixedly mounted on the door body by a plurality of bolts. A rotating shaft body 21 is further provided on the mounting frame 1, and the axis of the rotating shaft body 21 is the length direction of the mounting frame 1. The rotating shaft body 21 passes through the mounting frame 1 to be rotatably connected to the mounting frame 1, and both ends of the rotating shaft body 21 extend outside the mounting frame 1. The locking tongue 2 is sleeved on the rotating shaft body 21 to be rotatably connected to the mounting frame 1 through the rotating shaft body 21. One end of the locking tongue 2 extends outside the mounting frame 1 and is used for inserting into the locking groove in the door frame, and the other end of the locking tongue 2 is located inside the mounting frame 1.

[0038] Refer to Figure 1 and Figure 2 , a limiting rod 22 is further provided on the locking tongue 2. The limiting rod 22 is inserted into the locking tongue 2, and its axis is parallel to the rotation axis of the locking tongue 2. Both ends of the limiting rod 22 extend outside the locking tongue 2 and pass through the side wall of the mounting frame 1. On both side walls of the mounting frame 1 along the axis direction of the limiting frame 421, limiting grooves 11 for the limiting rod 22 to move are respectively and penetratingly formed, and each limiting groove 11 is set to be arc-shaped.

[0039] Refer to Figure 2 and Figure 3 , a return torsion spring 211 is further sleeved on the middle part of the rotating shaft body 21. One end of the return torsion spring 211 abuts against the inner wall of the mounting frame 1, and the other end abuts against the inner wall of the locking tongue 2 to supply the locking tongue 2 to return to the initial position through its own elastic force. At the end of the locking tongue 2 located inside the mounting frame 1 and far from the unlocking frame 3, a contact part 23 extends towards the end close to the self-locking frame 41, and the contact part 23 is integrally formed with the locking tongue 2.

[0040] Refer to Figure 2 and Figure 3 , the middle part of the self-locking frame 41 along its extending direction is rotatably connected to the mounting frame 1 through a pin shaft, and the rotation axis is parallel to the rotation axis of the locking tongue 2. One end of the self-locking frame 41 extends towards the end close to the locking tongue 2 and extends to the side of the contact part 23 close to the unlocking frame 3, so that the contact part 23 is located on the rotation path of the end of the self-locking frame 41, so that the end of the self-locking frame 41 can drive the locking tongue 2 to rotate by abutting against the contact part 23, so that the locking tongue 2 gradually retracts into the mounting frame 1.

[0041] Refer to Figure 2 and Figure 3 , at the end of the self-locking frame 41 close to the locking tongue 2, a self-locking part 411 further extends towards the direction close to the end of the locking tongue 2 far from the end rotatably connected to the mounting frame 1. The self-locking part 411 is integrally formed with the self-locking frame 41, and when the self-locking part 411 rotates towards the direction close to the unlocking frame 3 along with the self-locking frame 41, the self-locking part 411 can be located on the rotation path of the end of the locking tongue 2 to lock the locking tongue 2 in a butting manner.

[0042] Reference Figure 2 and Figure 3 A torsion spring 43 is also sleeved on the pin shaft for the self-locking frame 41 to rotate. The middle part of the torsion spring 43 abuts against the self-locking frame 41, and the end part abuts against the inner wall of the mounting frame 1, so that the self-locking frame 41 is reset by its own elastic force, so that the self-locking part 411 rotates toward the direction close to the end of the lock tongue 2, and the lock tongue 2 is locked by abutment.

[0043] Reference Figure 3 The end of the lock tongue 2 close to the self-locking frame 41 is also provided with a clearance cavity 5, so that when the self-locking frame 41 is not in a state of locking the lock tongue 2, the self-locking portion 411 can move into the clearance cavity 5, so that the self-locking frame 41 can make way for the lock tongue 2. In the embodiment of the present application, the distance from the end of the clearance cavity 5 away from the self-locking portion 411 to the rotation connection of the lock tongue 2 is greater than the distance from the end of the clearance cavity 5 close to the self-locking portion 411 to the rotation connection of the lock tongue 2, so that when the self-locking frame 41 is not in a state of locking the lock tongue 2, the self-locking frame 41 is driven to rotate by abutting with the end of the self-locking portion 411.

[0044] Reference Figure 2 The end of the self-locking frame 41 away from the lock tongue 2 extends outward from the mounting frame 1 and is inclined in the direction away from the unlocking frame 3. The end of the self-locking frame 41 is located on one side of the corresponding end of the mounting frame 1, so that the remaining structures in the door body can drive the self-locking frame 41 and the lock tongue 2 by pushing the self-locking frame 41 to rotate, thereby unlocking the lock tongue 2.

[0045] Reference Figure 1 and Figure 2 The self-locking assembly 42 includes a limit frame 421 and an elastic member 422. The limit frame 421 is located on the side of the lock tongue 2 close to the unlocking frame 3. The limit frame 421 is slidably connected to the mounting frame 1, and the sliding direction is the width direction of the mounting frame 1. The shape of the limit frame 421 is adapted to the shape of the inner wall of the mounting frame 1, so that the limit frame 421 limits the displacement freedom of the mounting frame 1.

[0046] Reference Figure 1 and Figure 2 , one end of the limit frame 421 away from the unlocking frame 3 extends out of the mounting frame 1. An additional rod 423 is also provided on the end of the limit frame 421 close to the unlocking frame 3. The axis of the additional rod 423 is arranged parallel to the rotation axis of the lock tongue 2, and both ends pass through the limit frame 421 and the side wall of the mounting frame 1, thereby reaching the outside of the mounting frame 1. A through slot is also provided on the side wall of the mounting frame 1 for the additional rod 423 to move together with the limit frame 421.

[0047] Reference Figure 2 and Figure 3, the additional rod 423 is located on the side of the self-locking part 411 away from the lock tongue 2, and the outer wall of the additional rod 423 abuts against the outer wall of the self-locking part 411 on the side away from the lock tongue 2 to limit the self-locking frame 41, thereby preventing the self-locking frame 41 from rotating under the elastic force of the torsion spring 43, so that the self-locking part 411 is not on the rotation path of the lock tongue 2.

[0048] Referring to Figure 1 , in the embodiment of the present application, the elastic member 422 is set as a tension spring, and the number of the tension springs is set to two. The two tension springs are respectively located at both ends of the additional rod 423. Each tension spring is sleeved on the corresponding end of the additional rod 423, and the other end is sleeved on the corresponding end of the rotating shaft body 21. In the embodiment of the present application, grooves for sleeving and embedding the ends of the corresponding tension springs are provided at both ends of the additional rod 423 and the rotating shaft body 21 to reduce the probability of the tension spring detaching.

[0049] Referring to Figure 2 and Figure 3 , one end of the limiting frame 421 close to the unlocking frame 3 further extends in the direction close to the lock tongue 2 with an abutting portion 4211. The abutting portion 4211 is located on the rotation path of the lock tongue 2, so that when the lock tongue 2 retracts into the installation frame 1, it can drive the limiting frame 421 to slide by abutting against the abutting portion 4211.

[0050] Referring to Figure 2 and Figure 3 , in the initial state, both the lock tongue 2 and the end of the limiting frame 421 extend outside the installation frame 1. At this time, the additional rod 423 abuts against the outer wall of the self-locking part 411 to limit the self-locking frame 41, so that the self-locking frame 41 is not on the rotation path of the lock tongue 2. When the self-locking frame 41 rotates, causing the self-locking part 411 to rotate away from the limiting frame 421, the self-locking frame 41 abuts against the contact part 23, thereby pushing the lock tongue 2 to rotate, causing the lock tongue 2 to gradually retract into the installation frame 1. During this process, the lock tongue 2 gradually abuts against the abutting portion 4211, thereby driving the limiting frame 421 to slide.

[0051] Referring to Figure 4 , when the door body equipped with the present application is closed, causing the lock tongue 2 to enter the lock groove of the door frame, the end of the limiting frame 421 abuts against the outer wall of the door frame, causing the limiting frame 421 to slide into the installation frame 1. During this process, the additional rod 423 slides in the direction close to the unlocking frame 3, causing the additional rod 423 to gradually move away from the self-locking part 411, gradually releasing the restriction on the self-locking frame 41. The self-locking frame 41 rotates under the elastic force of the torsion spring 43, causing the self-locking part 411 to rotate in the direction close to the end of the lock tongue 2 (i.e., close to the limiting frame 421), and finally being located on the rotation path of the end of the lock tongue 2 to lock the lock tongue 2.

[0052] Reference Figure 2 and Figure 3 On one side of the self-locking frame 41 close to the unlocking frame 3, an unlocking portion 412 is further extended. The unlocking portion 412 is integrally formed with the self-locking frame 41. The unlocking frame 3 is rotatably connected to the mounting frame 1, and the rotation axis is the height direction of the mounting frame 1. The unlocking frame 3 is used to connect with the handle of the door body, so that the user can rotate the handle to make the unlocking frame 3 rotate.

[0053] Reference Figure 2 and Figure 3 On the unlocking frame 3, an abutting protrusion 31 is further provided. The abutting protrusion 31 is integrally formed with the unlocking frame 3. The abutting protrusion 31 extends towards the unlocking portion 412, and the unlocking portion 412 is located on the rotation path of the abutting protrusion 31, so that when the unlocking protrusion rotates, it can abut against the unlocking portion 412 to push the self-locking frame 41 to rotate, and the self-locking frame 41 drives the lock tongue 2 to retract into the mounting frame 1.

[0054] The implementation principle of Embodiment 1 of this application for a safety door lock is as follows: When the door body installed with this application is closed, so that the lock tongue 2 enters the lock groove of the door frame, the end of the limit frame 421 abuts against the outer wall of the door frame, so that the limit frame 421 slides into the mounting frame 1. During this process, the additional rod 423 slides towards the unlocking frame 3, so that the additional rod 423 gradually moves away from the self-locking portion 411, and the restriction on the self-locking frame 41 by the additional rod 423 is gradually released. At this time, the self-locking frame 41 rotates under the elastic force of the torsion spring 43, so that the self-locking portion 411 rotates towards the end of the lock tongue 2 (i.e., towards the limit frame 421), and finally is located on the rotation path of the end of the lock tongue 2 to lock the lock tongue 2.

[0055] Embodiment 2: The difference between Embodiment 2 of this application and Embodiment 1 is that: Reference Figure 5 and Figure 6 On the mounting frame 1, a pushing frame 6 is further provided. The pushing frame 6 is slidably connected to the mounting frame 1 through a slide rail, and the sliding direction is the height direction of the mounting frame 1. One end of the self-locking frame 41 away from the lock tongue 2 is located on the sliding path of the pushing frame 6, so that the pushing frame 6 can drive the self-locking frame 41 to rotate by abutting against the corresponding end of the self-locking frame 41. In the embodiment of this application, a pressure spring can also be provided on the mounting frame 1 for the pushing frame 6 to reset.

[0056] Reference Figure 6 and Figure 7, the self-locking mechanism 4 further includes an abutting frame 44 and a linkage member 45. In the embodiment of the present application, the number of the linkage members 45 is set to two and are respectively located on both sides of the limiting frame 421 along its width direction. The abutting frame 44 includes two sliding frames 441 and a switch frame 442. The sliding frames 441 are arranged in one-to-one correspondence with the linkage members 45. Each linkage member 45 includes a linkage frame 451. One end of each linkage frame 451 is rotatably connected to the limiting frame 421 through a pin shaft, and the other end is rotatably connected to the corresponding sliding frame 441 through a pin shaft.

[0057] Refer to Figure 6 and Figure 7 , each sliding frame 441 is slidably connected to the corresponding installation frame 1 through a slide rail, and the sliding direction of each sliding frame 441 is the height direction of the installation frame 1. Each sliding frame 441 is provided with a sliding groove 7 penetrating therethrough, and each sliding groove 7 extends along the width direction of the installation frame 1.

[0058] Refer to Figure 6 and Figure 7 , in the embodiment of the present application, the switch frame 442 is arranged in a round rod shape. The two ends of the switch frame 442 respectively pass through the sliding groove 7 of the corresponding sliding frame 441 from the inside of the installation frame 1 and are both abutted against the inner wall of the sliding groove 7, so that the switch frame 442 can slide along the extending direction of the sliding groove 7.

[0059] Refer to Figure 5 and Figure 7 , each sliding frame 441 extends outwards from the installation frame 1 with an extension portion 4411. Each extension portion 4411 passes through the corresponding side wall of the installation frame 1, and the installation frame 1 is further provided with a through groove for the extension portion 4411 to move. Each extension portion 4411 is provided with an elastic spring 46, and the elastic springs 46 are all arranged as tension springs.

[0060] Refer to Figure 6 and Figure 7 , one end of each elastic spring 46 is sleeved on the corresponding extension portion 4411, and the other end is sleeved on the corresponding end of the corresponding switch frame 442, so as to supply the switch frame 442 to reset through its own elastic force. One end of the self-locking frame 41 far from the lock tongue 2 is located on the displacement path of the switch frame 442 when the switch frame 442 slides with the sliding frame 441.

[0061] Refer to Figure 6 and Figure 7, on the side of the pushing frame 6 close to the switch frame 442, there are also two driving parts 61 extending. The driving parts 61 are integrally formed with the pushing frame 6. Each driving part 61 is located on the side of the switch frame 442 close to the locking tongue 2, and a guiding surface is provided at one end of each driving part 61 close to the switch frame 442. So that when the driving part 61 slides with the pushing frame 6, the guiding surface on the driving part 61 can drive the switch frame 442 to slide away from the self-locking frame 41 by abutting against the switch frame 442, making the switch frame 442 disengage from the self-locking frame 41.

[0062] Refer to Figure 6 and Figure 7 , in the initial state, both the locking tongue 2 and the extension frame extend out of the installation frame 1. At this time, the switch frame 442 is located on the side of the self-locking frame 41 close to the unlocking frame 3. At this time, the switch frame 442 does not abut against the self-locking frame 41, and at this time, the driving part 61 does not abut against the switch frame 442. When the door body installed with the present application is closed, so that the limiting frame 421 abuts against the door frame and gradually retracts into the installation frame 1, at this time, the extension frame drives the linkage frame 451 to displace, and then drives the sliding frame 441 to slide towards the self-locking frame 41 through the linkage frame 451, so that the switch frame 442 gradually approaches the self-locking frame 41, and after abutting against the self-locking frame 41, the self-locking frame 41 is pushed to rotate, so that the self-locking part 411 on the self-locking frame 41 is located on the rotation path of the locking tongue 2.

[0063] Refer to Figure 6 and Figure 7 , when the pushing frame 6 slides, so that the driving frame approaches the switch frame 442, the guiding surface on the driving part 61 abuts against the switch frame 442, thereby pushing the switch frame 442 to slide away from the self-locking frame 41, so that the switch frame 442 releases the restriction on the self-locking frame 41. During this process, the elastic spring 46 is pulled. After that, the pushing frame 6 abuts against the end of the self-locking frame 41, thereby driving the self-locking frame 41 to rotate, so that the self-locking frame 41 drives the locking tongue 2 to retract into the installation frame 1.

[0064] Refer to Figure 6 and Figure 7 , on the installation frame 1, there are also a transmission frame 8 and a contact frame 9 arranged. In the embodiment of the present application, the numbers of the transmission frame 8 and the contact frame 9 are both set to two, and they are arranged in one-to-one correspondence. The two transmission frames 8 are respectively located on opposite sides of the unlocking frame 3. One end of each transmission frame 8 is rotatably connected to the corresponding end of the unlocking frame 3 through a pin shaft, and the other end is rotatably connected to the corresponding contact frame 9 through a pin shaft.

[0065] Refer to Figure 6 and Figure 7, each contact frame 9 is rotatably connected to the installation frame 1 through sliding, and the sliding direction is the same as the sliding direction of the switch frame 442 relative to the sliding frame 441. The switch frame 442 is located on the sliding path of each contact frame 9, so that no matter which direction the unlocking frame 3 rotates, there is a contact frame 9 that pushes the switch frame 442 to slide.

[0066] Referring to Figure 6 and Figure 7 , in the initial state, each contact frame 9 is located on the side of the switch frame 442 close to the self-locking frame 41. When the unlocking frame 3 rotates, the unlocking frame 3 drives each contact frame 9 to slide through two transmission frames 8, and makes one contact frame 9 approach the switch frame 442, thereby pushing the switch frame 442 away from the self-locking frame 41, so that the switch frame 442 releases the limit on the self-locking frame 41. During this process, the other contact frame 9 moves away from the switch frame 442 under the drive of the corresponding transmission frame 8.

[0067] The implementation principle of the safety door lock in Embodiment 2 of the present application is as follows: When the door body installed with the present application is closed, so that the limit frame 421 abuts against the door frame and gradually retracts into the installation frame 1, at this time, the extension frame drives the linkage frame 451 to displace, and then drives the sliding frame 441 to slide towards the self-locking frame 41 through the linkage frame 451, so that the switch frame 442 gradually approaches the self-locking frame 41, and after abutting against the self-locking frame 41, pushes the self-locking frame 41 to rotate, so that the self-locking portion 411 on the self-locking frame 41 is located on the rotation path of the lock tongue 2.

[0068] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A safety door lock, comprising a mounting frame (1) for mounting on a door body, wherein a lock tongue (2) and an unlocking frame (3) are arranged on the mounting frame (1), and characterized in that: A self-locking mechanism (4) is further provided on the installation frame (1). The self-locking mechanism (4) includes a self-locking frame (41) and a self-locking component (42). The self-locking frame (41) is rotatably connected to the installation frame (1). One end of the self-locking frame (41) extends towards the direction where the lock tongue (2) is located and is located on the rotation path of the lock tongue (2). The self-locking component (42) is used to drive the self-locking frame (41) to rotate when the door body is closed, so that the self-locking frame (41) is located on the rotation path of the lock tongue (2) after rotation.

2. The safety door lock according to claim 1, characterized in that: The self-locking component (42) includes a limit frame (421) and an elastic member (422). The limit frame (421) is slidably connected to the installation frame (1). One end of the limit frame (421) extends outside the installation frame (1) and is used to abut against the door frame. The other end of the limit frame (421) extends to the side of the self-locking frame (41) away from the lock tongue (2) and abuts against the self-locking frame (41). The elastic member (422) is used to, through its own elastic force, when the limit frame (421) abuts against the door frame and slides, after the limit frame (421) is separated from the self-locking frame (41), allow the self-locking frame (41) to rotate, so that the self-locking frame (41) is located on the rotation path of the lock tongue (2).

3. The safety door lock according to claim 2, wherein: The self-locking mechanism (4) further includes an abutting frame (44) and a linkage member (45). The abutting frame (44) is located on the side of the self-locking frame (41) away from the lock tongue (2). The abutting frame (44) is slidably connected to the installation frame (1), and the self-locking frame (41) is located on the sliding path of the abutting frame (44). The limit frame (421) drives the abutting frame (44) to slide through the linkage member (45).

4. The safety door lock according to claim 3, characterized in that: A pushing frame (6) is further provided on the installation frame (1). The pushing frame (6) is slidably connected to the installation frame (1). One end of the self-locking frame (41) away from the lock tongue (2) is located on the sliding path of the pushing frame (6).

5. The safety door lock according to claim 4, characterized in that: The abutting frame (44) includes a sliding frame (441) and a switch frame (442). The sliding frame (441) is slidably connected to the installation frame (1). The linkage member (45) is used to drive the sliding frame (441) to slide. The self-locking frame (41) is located on the displacement path when the switch frame (442) displaces together with the sliding frame (441). The switch frame (442) is slidably connected to the sliding frame (441), and the sliding direction is away from the self-locking frame (41). The pushing frame (6) further extends a driving portion (61) towards the direction close to the sliding frame (441). The driving portion (61) drives the switch frame (442) to slide away from the self-locking frame (41) by abutting against the switch frame (442).

6. The safety door lock according to claim 5, characterized in that: A transmission frame (8) and a contact frame (9) are further provided on the installation frame (1). One end of the transmission frame (8) is rotatably connected to the unlocking frame (3), and the other end is rotatably connected to the contact frame (9). The contact frame (9) is slidably connected to the installation frame (1), and the switch frame (442) is located on the sliding path of the contact frame (9).

7. The safety door lock according to claim 3, characterized in that: The linkage member (45) includes a linkage frame (451). One end of the linkage frame (451) is rotatably connected to the limiting frame (421), and the other end is rotatably connected to the abutting frame (44).

8. The safety door lock according to claim 2, characterized in that: An abutting portion (4211) is further provided at one end of the limiting frame (421) close to the self-locking frame (41). The abutting portion (4211) is located on the rotation path of the locking tongue (2).

9. A safety door lock according to claim 1, characterized in that: The self-locking frame (41) is located on the displacement path of the locking tongue (2) at one end away from its own rotation connection. The locking tongue (2) further extends a contact portion (23) toward the side close to the self-locking frame (41). The contact portion (23) is located on the rotation path of the self-locking frame (41).

10. A safety door lock according to claim 1, characterized in that: The self-locking frame (41) further extends an unlocking portion (412) outward. The unlocking frame (3) is rotatably connected to the installation frame (1). The unlocking frame (3) extends a abutting protrusion (31) toward the direction close to the unlocking portion (412). The abutting protrusion (31) abuts against the unlocking portion (412).

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