A lock that can maintain a door open angle

Abstract

The application discloses a kind of lock that can keep door open angle, including locking device and with the first connecting rod of locking device rotation connection, first connecting rod and locking device are connected with door plate and door frame respectively;The first connecting rod is equipped with limit wheel at locking device connection end, recess is equipped on the limit wheel;Locking device is equipped with the latch of matching recess and the top pressure elastic element matched with latch, the top pressure elastic element can insert the latch into the recess, and the movement of the first connecting rod is locked.The lock that can keep door open angle provided by the application, when door plate and door frame are at a specific angle, the latch of locking device is inserted into the recess of limit wheel by top pressure elastic element, and the rotation of limit wheel is blocked, so as to fix first connecting rod, and the relative position of door plate and door frame is fixed.The effect of automatically keeping door open angle after door is opened to a certain angle is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of door and window appliances, in particular to a lock device capable of keeping a door open at a certain angle. BACKGROUND

[0002] A door closer is a spring-like hydraulic device arranged on the head of a door, which can automatically close the door after being compressed and released when the door is opened. Its function is similar to that of a spring door, which can ensure that the door is accurately and timely closed to the initial position after being opened.

[0003] However, in daily use, it is often necessary to keep the door open for a long time, and then restore the automatic closing use scenario. The existing door closer is difficult to meet such a demand.

[0004] Therefore, a device capable of keeping a door open at a certain angle is needed. SUMMARY

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a lock device capable of keeping a door open at a certain angle.

[0006] The technical scheme adopted by the present application to solve its technical problems is:

[0007] A lock device capable of keeping a door open at a certain angle, comprising a first connecting rod, a second connecting rod rotatably connected to the first connecting rod, a locking device arranged on the second connecting rod, and the first connecting rod and the second connecting rod being connected to the door panel and the door frame at the ends away from the rotatable connection, respectively.

[0008] The locking device is provided with a latch and a top pressure elastic element matched with the latch, and the first connecting rod and the second connecting rod are provided with a limiting element connected to the first connecting rod, and the top pressure elastic element can push the latch towards the limiting element of the first connecting rod and lock the movement of the first connecting rod.

[0009] The locking device is provided with an automatic locking mechanism capable of automatically locking the latch pushed to the connecting part.

[0010] As an improved scheme, the automatic locking mechanism comprises a pushing structure in transmission connection with the latch, and a positioning locking structure matched with the pushing structure, which can lock the movement of the pushing structure when the pushing structure pushes the latch to a certain position.

[0011] As an improved scheme, the pushing structure comprises a pressure plate, and the positioning locking structure comprises a locking plate, a locking elastic element, and the latch is provided with an inclined surface matched with the pressure plate; the pressure plate is subjected to the action of gravity, and exerts pressure on the inclined surface of the latch, so as to push the latch to the connecting part.

[0012] When the pressing plate is located at the position where the latch locks the first connecting rod, the locking plate is blocked by the locking elastic member from moving away from the latch.

[0013] As an improvement, when the pressing plate is located at the position where the latch is away from the connecting position, the locking plate is blocked by the locking elastic member from moving towards the latch.

[0014] As an improvement, the locking plate comprises a rotating end and a free end, the rotating end is rotatably connected to the automatic locking mechanism, and the free end is connected to the locking elastic member; the locking plate is further provided with a blocking protrusion, which is pressed against the side of the moving direction of the pressing plate by the locking elastic member when the latch is away from the connecting position.

[0015] When the latch is pushed to the connecting position, the blocking protrusion is moved to the moving path of the pressing plate by the locking elastic member, thereby blocking the movement of the pressing plate away from the latch.

[0016] As an improvement, when the latch is away from the connecting position, the blocking protrusion is moved to the moving path of the pressing plate by the locking elastic member, thereby blocking the movement of the pressing plate towards the latch.

[0017] Preferably, the second connecting rod is provided with a limiting seat, the limiting seat is provided with a ball at one end facing the limiting wheel, and the limiting seat is further provided with a through hole matching the latch and leading to the side of the ball away from the limiting wheel, the latch is inserted into the recess by pushing the ball, thereby locking the movement of the first connecting rod.

[0018] As an improvement, the pressing plate is provided with a through hole at both ends, the rotating end of the locking plate is provided with a through hole, the automatic locking mechanism is further provided with two limiting columns, and the two ends of the pressing plate and the rotating end of the locking plate are sleeved on the limiting columns; the limiting columns are further provided with steps at the ends for preventing the locking plate and the locking plate from falling off.

[0019] As an improvement, the automatic locking mechanism is further provided with an unlocking controller, which can control the locking plate to move away from the moving path of the pressing plate, thereby releasing the locking state of the latch.

[0020] As an improvement, the unlocking controller is an electromagnet.

[0021] As an improved scheme, the automatic locking mechanism is further provided with an emergency unlocking device, which comprises an unlocking elastic element and a heat-sensitive blocking element, one end of the unlocking elastic element is connected with the free end of the locking plate, and the other end is connected with the automatic locking mechanism, the unlocking elastic element drives the locking plate to move in the direction away from the moving path of the pressing plate; the unlocking elastic element is provided with a protruding part, and the heat-sensitive blocking element is located at a position for blocking the movement of the protruding part.

[0022] As an improved scheme, the unlocking elastic element is a coil spring, and the heat-sensitive blocking element is a heat-sensitive self-explosion glass ball.

[0023] As an improved scheme, the automatic locking mechanism is further provided with an emergency unlocking device, which comprises an unlocking elastic element, a heat-sensitive blocking element, a traction element and a baffle;

[0024] The baffle is provided with the heat-sensitive blocking element on the side facing the free end of the locking plate, and is provided with the unlocking elastic element on the side facing away from the free end of the locking plate; one end of the traction element is connected with the free end of the locking plate, and the other end is connected with the unlocking elastic element; the unlocking elastic element drives the locking plate to move in the direction away from the moving path of the pressing plate through the traction element, and the heat-sensitive blocking element is located at a position for blocking the movement of the traction element.

[0025] As an improved scheme, one end of the first connecting rod connected with the locking device is provided with a limiting wheel, and the limiting wheel is provided with a groove.

[0026] The groove is matched with the latch, the latch is inserted into the groove by the pressing elastic element, and the movement of the first connecting rod is locked.

[0027] As an improved scheme, the locking device is further provided with a remote signal receiving device connected with the signal of the electromagnet, so as to remotely send a signal to release the locking state of the door plate and the door frame. The locking state of the door plate and the door frame can also be remotely monitored.

[0028] As an improved scheme, the locking device is further provided with a magnetic inductor, which can induct whether the first connecting rod rotates to the position coinciding with the locking device.

[0029] Compared with the prior art, the beneficial effects of the present application are:

[0030] 1) The door opening angle locking device provided by the present application can keep the door open at a certain angle, when the door plate and the door frame are at a certain angle, the latch of the locking device is pushed into the groove of the limiting wheel by the pressing elastic element, the rotation of the limiting wheel is blocked, the first connecting rod is fixed, and the relative position of the door plate and the door frame is fixed. The effect of automatically keeping the door open at a certain angle after opening the door to a certain angle is achieved.

[0031] 2) The side wall of the limiting wheel groove is inclined to the insertion direction of the bolt, so that the side wall of the groove can press the moving direction of the bolt, and when the pressure reaches a certain level, the bolt can exit the groove, and the door and the door frame are re-closed. The end of the bolt near the limiting wheel is provided with a ball, and the ball abuts against the limiting wheel, so that the interaction between the bolt and the groove is smoother.

[0032] 3) The locking device is provided with an automatic locking mechanism that can automatically lock the bolt inserted into the groove. After the door is opened to a certain angle, the automatic locking mechanism is automatically maintained, and the door needs to be closed by using an unlocking controller (such as an electromagnet) to release the locking state of the automatic locking mechanism, which is suitable for more use scenarios.

[0033] 4) When the bolt is pushed to the connection state, the blocking protrusion is moved to the moving path of the pressing plate under the action of the locking elastic member, and the pressing plate is blocked from moving away from the bolt. Thus, the state of the bolt locking the first connecting rod can be maintained.

[0034] When the bolt is away from the connection state, the blocking protrusion is moved to the moving path of the pressing plate under the action of the locking elastic member, and the pressing plate is blocked from moving close to the bolt. Thus, the state of the bolt unlocking the first connecting rod can be maintained.

[0035] Further, the unlocking controller (such as an electromagnet) can be used to switch the door and the door frame between the locked state and the unlocked state, which is convenient to use.

[0036] 5) The mechanical automatic locking mechanism including the pressing plate, the pressing elastic member, the locking plate, and the locking elastic member is used, which is resistant to electronic interference and improves the use reliability.

[0037] 6) The mechanical emergency unlocking device including the thermal sensing blocking member is used, the door closer can trigger the emergency unlocking device to forcibly release the locking state of the locking device when the high temperature of fire is sensed, so that the door is automatically closed, and the effect of automatically closing the door when the fire is sensed is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a whole structure diagram of the door closer capable of maintaining the opening angle of the door.

[0039] Figure 2 It is a local structure diagram of the connection between the first connecting rod and the locking device of the door closer capable of maintaining the opening angle of the door.

[0040] Figure 3 It is a cross-sectional view of the inclined surface interaction structure of the pressing plate and the bolt of the door closer capable of maintaining the opening angle of the door along the moving direction of the bolt.

[0041] Figure 4This is a cross-sectional view perpendicular to the direction of movement of the latch, showing the interaction structure between the pressure plate of the latch and the inclined surface of the latch, which is capable of maintaining the door opening angle according to the present invention.

[0042] Figure 5 This is a partial cross-sectional view of a locking plate and pressure plate interaction structure of a locker that can maintain the door opening angle according to the present invention.

[0043] Figure 6 This is a schematic diagram of the interaction structure between the locking plate, locking elastic element, unlocking controller, and emergency unlocking device of a locker capable of maintaining the door opening angle according to the present invention.

[0044] Figure 7 This is a schematic diagram illustrating the effect of a lock that can maintain the opening angle of a door in conjunction with the door panel and frame according to the present invention.

[0045] Figure 8 This is a partial cross-sectional view illustrating how the locking plate switches between forced locking and forced unlocking states on the pressure plate, which is a locker capable of maintaining the door's open angle according to the present invention.

[0046] Figure 9 This is a partial cross-sectional view illustrating the structure of another type of emergency unlocking device, which is a lock capable of maintaining the door's open angle according to the present invention.

[0047] Figure 10 This is a partial cross-sectional view illustrating the relationship between the second connecting rod, the limiting seat, and the ball bearings of a lock that can maintain the door opening angle according to the present invention.

[0048] Wherein, 1: First connecting rod; 2: Limiting wheel; 3: Groove; 4: Pin; 5: Pressing elastic element; 6: Ball bearing; 7: Pressure plate; 8: Pressing elastic element; 9: Locking plate; 10: Locking elastic element; 11: Inclined surface; 12: Rotating end; 13: Free end; 14: Blocking protrusion; 15: Unlocking controller; 16: Unlocking elastic element; 17: Heat-sensitive blocking element; 18: Locking device; 19: Door panel; 20: Door frame; 21: Second connecting rod; 22: Traction element; 23: Baffle; 24: Limiting seat; 25: Ball bearing. Detailed Implementation

[0049] The present invention will now be further described in conjunction with the accompanying drawings and embodiments:

[0050] Implementation Case 1:

[0051] As attached Figures 1-7 As shown, a lock that can maintain the opening angle of a door includes a locking device 18 and a first connecting rod 1 rotatably connected to the locking device 18. The first connecting rod 1 and the locking device 18 are respectively connected to the door panel 19 and the door frame 20.

[0052] The locking device 18 is provided with a latch 4 and a top pressure elastic element 5 matched with the latch 4, which can push the latch 4 to the connection between the locking device 18 and the first connecting rod 1 and lock the movement of the first connecting rod 1.

[0053] The locking device 18 is provided with an automatic locking mechanism which can automatically lock the latch 4 pushed to the connection.

[0054] The automatic locking mechanism comprises a pressure plate 7, a pressure elastic element 8, a locking plate 9 and a locking elastic element 10, and the latch 4 is provided with an inclined surface 11 matched with the pressure plate 7; the pressure plate 7 is subjected to gravity and exerts pressure on the inclined surface 11 of the latch 4, so as to push the latch 4 to the connection.

[0055] When the pressure plate 7 is located at the position where the latch 4 locks the first connecting rod 1, the locking plate 9 is subjected to the locking elastic element 10 and blocks the movement of the pressure plate 7 away from the latch 4.

[0056] When the pressure plate 7 is located at the position where the latch 4 is away from the connection, the locking plate 9 is subjected to the locking elastic element 10 and blocks the movement of the pressure plate 7 towards the latch 4.

[0057] The locking plate 9 comprises a rotating end 12 and a free end 13, the rotating end 12 is rotatably connected to the automatic locking mechanism, and the free end 13 is connected to the locking elastic element 10; the locking plate 9 is further provided with a blocking protrusion 14, which is pressed against the side of the movement direction of the pressure plate 7 under the condition that the latch 4 is not pushed to the connection and is subjected to the locking elastic element 10.

[0058] Under the condition that the latch 4 is pushed to the connection, the blocking protrusion 14 is subjected to the locking elastic element 10 and moves to the movement path of the pressure plate 7, thereby blocking the movement of the pressure plate 7 away from the latch 4.

[0059] Under the condition that the latch 4 is away from the connection, the blocking protrusion 14 is subjected to the locking elastic element 10 and moves to the movement path of the pressure plate 7, thereby blocking the movement of the pressure plate 7 towards the latch 4.

[0060] The automatic locking mechanism is further provided with an unlocking controller 15, which can control the locking plate 9 to move away from the movement path of the pressure plate 7, thereby releasing the locking state of the latch 4.

[0061] The unlocking controller 15 is an electromagnet.

[0062] The automatic locking mechanism is also equipped with an emergency unlocking device, including an unlocking elastic element 16 and a heat-sensitive blocking element 17. One end of the unlocking elastic element 16 is connected to the free end 13 of the locking plate 9, and the other end is connected to the automatic locking mechanism. The unlocking elastic element 16 drives the locking plate 9 to move away from the moving path of the pressure plate 7. The unlocking elastic element 16 is provided with a protrusion, and the heat-sensitive blocking element 17 is located at the position that blocks the movement of the protrusion.

[0063] The unlocking elastic element 16 is a coil spring, and the heat-sensitive blocking element 17 is a heat-sensitive self-exploding glass ball.

[0064] The first connecting rod 1 is connected to the locking device 18 and has a limiting wheel 2 at one end, and the limiting wheel 2 has a groove 3.

[0065] The groove 3 matches the pin 4, and the pressing elastic element 5 inserts the pin 4 into the groove 3 to lock the movement of the first connecting rod 1.

[0066] The second connecting rod is provided with a limiting seat, and a ball is provided at one end of the limiting seat facing the limiting wheel. The limiting seat is also provided with a through hole that matches the pin and leads to the side of the ball away from the limiting wheel. The pin locks the movement of the first connecting rod by pushing the ball into the groove.

[0067] The operating principle of this implementation case is as follows:

[0068] As attached Figure 1 As shown in Figures 2 and 7, the first connecting rod 1 and the locking device 18 are connected to the door panel 19 and the door frame 20, respectively. When the door is opened, the first connecting rod 1 and the locking device 18 rotate relative to each other. When the door panel 19 is opened to a specific angle with the door frame 20, the first connecting rod 1 drives the limiting wheel 2 to rotate to the position where the groove 3 is directly opposite the pin 4. The pin 4 is pushed into the groove 3 by the top pressing elastic element 5, preventing the limiting wheel 2 from rotating, thereby stopping the first connecting rod 1 from rotating relative to the locking device 18, thus keeping the door frame 20 and the door panel 19 in an open state at a specific angle.

[0069] The interaction principle between pin 4, pressure plate 7, and pressure elastic element 8 is shown in the attached figure. Figure 3 and 4 As shown, the pressure plate 7 is movably disposed above the latch 4. When the latch 4 is inserted into the groove 3, the pressure plate 7 moves downward under the action of the pressure elastic element 8 and abuts against the bottom end of the inclined surface 11 of the latch 4. When the latch 4 is about to be removed from the groove 3, the inclined surface 11 of the latch 4 generates an upward pushing force on the pressure plate 7, causing the pressure plate 7 to rise. If the pressure plate 7 can be prevented from rising at this time, the latch 4 can be prevented from being removed from the groove 3, thereby maintaining the locked state of the door frame 20 and the door panel 19.

[0070] The interaction between the pressing plate 7 and the locking plate 9 is shown in the attached Figure 5 and 6 As shown in the attached Figure 6 , one end of the pressing plate 7 can move up and down, the locking plate 9 is provided with a moving end and a free end 13, and is also provided with a blocking protrusion 14. As shown in the attached , the locking elastic member 10 pushes the free end 13 to move to the left when there is no external force. When the pressing plate 7 is moved down to a certain extent (corresponding to the state of the bolt 4 inserted into the groove 3), the locking elastic member 10 pushes the free end 13 to move to the left, so that the blocking protrusion 14 moves above the pressing plate 7 and is located in the path of the upward movement of the pressing plate 7, thereby blocking the upward movement of the pressing plate 7 and preventing the bolt 4 from moving out of the groove 3, thereby maintaining the locked state of the door frame 20 and the door plate 19.

[0071] When the unlocking controller 15 (electromagnet) is activated, the free end 13 moves to the right, and the blocking protrusion 14 moves away from the path of the upward movement of the pressing plate 7, so that the pressing plate 7 can move upward, and the locked state of the door frame 20 and the door plate 19 is released.

[0072] When the bolt is pushed to the connection, the blocking protrusion is moved to the moving path of the pressing plate by the locking elastic member, thereby blocking the movement of the pressing plate away from the bolt. Thus, the state of the bolt locking the first connecting rod can be maintained.

[0073] When the bolt is away from the connection, the blocking protrusion is moved to the moving path of the pressing plate by the locking elastic member, thereby blocking the movement of the pressing plate towards the bolt. Thus, the state of the bolt unlocking the first connecting rod can be maintained.

[0074] Further, the use of an unlocking controller (such as an electromagnet) can switch the door and the door frame between the locked state and the unlocked state, which is convenient to use.

[0075] The working principle of the unlocking elastic member 16 and the heat-sensitive blocking member 17 is as follows:

[0076] Figure 6 As shown in the attached , the unlocking elastic member 16 is a coil spring, one end of which is fixed to the right side of the locking plate 9, and the other end is on the left side of the locking plate 9 and is prevented from moving to the right by the heat-sensitive blocking member 17. Under normal circumstances, it has no interference effect on the locking plate 9.

[0077] When the fire occurs, the high temperature makes the thermal induction blocking piece 17 break, losing the blocking effect on the left end of the coil spring. The left end of the coil spring presses the left end of the locking plate 9, so that the free end 13 of the locking plate 9 moves to the right and maintains this state. The blocking protrusion 14 moves away from the path of the upward movement of the pressing plate 7, so that the pressing plate 7 can move upward, releasing the locking state of the door frame 20 and the door plate 19. Thus, the door closer can forcibly release the locking state of the door frame 20 and the door plate 19 and make the door plate 19 close to the door frame 20 when subjected to high temperature of fire.

[0078] The principle of how the locking plate switches between the forced locking and forced unlocking state of the pressing plate is as follows:

[0079] As shown in Figure 8 , the pressing plate is provided with through holes at both ends, which are respectively sleeved on the left and right limiting columns. The rotating end of the locking plate is provided with a through hole and is sleeved on the left limiting column. The blocking protrusion can switch whether to block the upward and downward movement path of the part of the pressing plate sleeved on the left limiting column by rotating the free end of the locking plate.

[0080] When the blocking protrusion is located on the upward and downward movement path of the pressing plate, and the pressing plate is below the blocking protrusion, the pressing plate is blocked by the blocking protrusion and cannot be lifted, thereby maintaining the locking state of the angle between the door plate and the door frame.

[0081] When the blocking protrusion is located on the upward and downward movement path of the pressing plate, and the pressing plate is above the blocking protrusion, the pressing plate is blocked by the blocking protrusion and cannot be lowered, thereby maintaining the forced unlocking state of the angle between the door plate and the door frame.

[0082] The locking plate can switch between the above two states by rotating the free end to make the blocking protrusion leave the upward and downward movement path of the pressing plate.

[0083] In summary, after reading the present application file, those skilled in the art can make other various corresponding transformation schemes without creative mental labor according to the technical solutions and technical concepts of the present application, and different application scenarios all belong to the scope protected by the present application.

Claims

1. A door holder capable of maintaining a door open angle, characterized by, The application relates to a door lock device, which comprises a first connecting rod (1), a second connecting rod (21) rotatably connected with the first connecting rod (1), and a locking device (18) arranged on the second connecting rod (21); the first connecting rod (1) and the second connecting rod (21) are respectively connected with a door plate (19) and a door frame (20) at the ends away from the rotatable connection. The locking device (18) is provided with a bolt (4) and a top pressure elastic element (5) matched with the bolt (4); the connecting position of the first connecting rod (1) and the second connecting rod (21) is provided with a limiting element connected with the first connecting rod (1); the top pressure elastic element (5) can push the bolt (4) to the limiting element of the first connecting rod (1) of the locking device (18) and lock the movement of the first connecting rod (1). The locking device (18) is internally provided with an automatic locking mechanism capable of automatically locking the bolt (4) pushed to the connecting position. The automatic locking mechanism comprises a pushing structure interacting with the bolt (4) and a positioning locking structure matched with the pushing structure; the positioning locking structure can lock the movement of the pushing structure when the pushing structure pushes the bolt (4) to a specific position. The pushing structure comprises a pressing plate (7); the bolt (4) is provided with an inclined surface (11) matched with the pressing plate (7); the pressing plate (7) exerts pressure on the inclined surface (11) of the bolt (4) and pushes the bolt (4) to the connecting position. The positioning locking structure comprises a locking plate (9); the locking plate (9) is further provided with a blocking protruding part (14); when the bolt (4) is not pushed to the connecting position, the blocking protruding part (14) is pressed against the side of the moving direction of the pressing plate (7); When the bolt (4) is pushed to the connecting position, the blocking protruding part (14) moves to the moving path of the pressing plate (7) and blocks the movement of the pressing plate (7) away from the bolt (4); When the bolt (4) is away from the connecting position, the blocking protruding part (14) moves to the moving path of the pressing plate (7) and blocks the movement of the pressing plate (7) towards the bolt (4); The automatic locking mechanism is further provided with an unlocking elastic element (16); one end of the unlocking elastic element (16) is connected with the free end (13) of the locking plate (9); the unlocking elastic element (16) drives the locking plate (9) to move away from the moving path of the pressing plate (7).

2. The door holdback of claim 1 wherein: The rotating end (12) of the locking plate (9) is rotatably connected with the automatic locking mechanism; the free end (13) of the locking plate (9) is connected with an unlocking controller (15); The automatic locking mechanism is further provided with the unlocking controller (15); the unlocking controller (15) can control the locking plate (9) to move away from the moving path of the pressing plate (7) and thus release the locking state of the bolt (4).

3. The door holder according to claim 1, wherein The pressing plate (7) is provided with through holes at both ends, the rotating end (12) of the locking plate (9) is provided with a through hole, the automatic locking mechanism is further provided with two limiting columns, the pressing plate (7) at both ends and the rotating end (12) of the locking plate (9) are sleeved on the limiting columns; the limiting columns are further provided with steps for preventing the pressing plate (7) and the locking plate (9) from falling off.

4. The door holder according to claim 1, wherein The automatic locking mechanism is further provided with an emergency unlocking device, which comprises an unlocking elastic element (16) and a heat-sensitive blocking element (17), one end of the unlocking elastic element (16) is connected with the free end (13) of the locking plate (9), and the other end is connected with the automatic locking mechanism, the unlocking elastic element (16) is provided with a protruding part, and the heat-sensitive blocking element (17) is located at a position blocking the movement of the protruding part.

5. The door holder according to claim 4, wherein The unlocking elastic element (16) is a coil spring, and the heat-sensitive blocking element (17) is a heat-sensitive self-explosion glass ball.

6. The door holder according to claim 1, wherein The automatic locking mechanism is further provided with an emergency unlocking device, which comprises an unlocking elastic element (16), a heat-sensitive blocking element (17), a traction element and a baffle; The baffle is provided with a heat-sensitive blocking element (17) on the side facing the free end (13) of the locking plate (9), and is provided with an unlocking elastic element (16) on the side facing away from the free end (13) of the locking plate (9); one end of the traction element is connected with the free end (13) of the locking plate (9), and the other end is connected with the unlocking elastic element (16); the unlocking elastic element (16) drives the locking plate (9) to move in the direction away from the moving path of the pressing plate (7) through the traction element, and the heat-sensitive blocking element (17) is located at a position blocking the movement of the traction element.

7. The door holder according to claim 1, wherein The first connecting rod (1) is connected with a locking device (18) at one end, and is provided with a limiting wheel (2); the limiting wheel (2) is provided with a groove (3). The groove (3) matches the bolt (4), the top pressing elastic element (5) inserts the bolt (4) into the groove (3), and the movement of the first connecting rod (1) is locked.

8. The keeper capable of maintaining a door ajar angle according to claim 7, wherein, The second connecting rod (21) is provided with a limiting seat, the limiting seat is provided with a ball at one end facing the limiting wheel (2), and the limiting seat is further provided with a through hole matching the bolt (4) and leading to the side of the ball away from the limiting wheel (2); the bolt is inserted into the groove (3) by pushing the ball, and the movement of the first connecting rod (1) is locked.

9. The door holder of claim 1, wherein The locking device (18) is further provided with a magnetic inductor, which can sense whether the first connecting rod (1) rotates to the position coinciding with the locking device (18) and further sense whether the door plate and the door frame are completely closed.

10. The keeper capable of maintaining a door ajar angle according to claim 9, wherein, The locking device is further provided with an alarm device connected with the magnetic inductor signal, which can buzz and send alarm signals.

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