Self-closing door closer

Abstract

The utility model relates to door closer technology field discloses a kind of self-locking door closers, including door seat and slide rail, the outer wall top of door seat is fixedly connected with shaft seat, the inner wall bottom of shaft seat is fixedly connected with pivot, the outer wall of pivot is rotatably connected with rotating plate, the top of rotating plate is fixedly connected with wheel shaft, the top of wheel shaft is rotatably connected with pulley, the top of slide rail is fixedly connected with two lock seats, the top of slide rail is fixedly connected with two pressure seats, the inner wall top of two pressure seats is fixedly connected with spring, the inner wall of two lock seats is slidably connected with slide axle. In the utility model, the action of left and right side inclined plane block in door opening and closing process in succession, so that pulley is locked in the specific position of slide rail when door is closed, the self-locking function of door closer is realized, so as to prevent door from shaking or being accidentally pushed open, guarantee the safety and privacy of space.

Description

Technical Field

[0001] This utility model relates to the field of door closer technology, and in particular to a self-locking door closer. Background Technology

[0002] A door closer is a device used to automatically close a door. It is used in various places where automatic door closing is required. It is installed above or on the side of the door. Its function is to automatically close the door after it is opened. By adjusting the speed and force of the door closer, the door can be made to close slowly and smoothly according to certain requirements. It plays a role in maintaining the normal closed state of the door, preventing the door from swinging randomly, and protecting the door and door frame.

[0003] A search revealed Chinese Patent Publication No. CN219327444U, which discloses a door closer and its usage method. The device includes a base plate with a fixing block fixedly connected to the middle of the top of the base plate. First mounting holes are formed around the base plate. A fixing plate is fixedly connected to the middle of the right side of the fixing block. A fixing buckle is fixedly connected to the outer side of the fixing plate. A positioning plate is movably connected to the rear side of the fixing block. A connecting plate is fixedly connected to the left side of the positioning plate. This invention achieves corrosion resistance by using a mounting plate comprising a first corrosion-resistant plate, a second corrosion-resistant plate, and a third corrosion-resistant plate, and a vertical plate comprising a first wear-resistant plate, a second wear-resistant plate, and a third wear-resistant plate. This effectively prevents moisture erosion, improves the service life and efficiency of the door closer, and solves the problem that existing door closers lack corrosion resistance, making them susceptible to moisture erosion, rusting, and reduced fixing efficiency, ultimately rendering them unusable. However, in scenarios with high security and access control requirements, the lack of a self-locking function can cause the door to sway or be accidentally pushed open. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a self-locking door closer, which aims to improve the problem that the lack of self-locking function in the prior art can cause the door to shake freely or be accidentally pushed open.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a self-locking door closer, comprising a door seat and a slide rail. A shaft seat is fixedly connected to the top of the outer wall of the door seat, and a rotating shaft is fixedly connected to the bottom of the inner wall of the shaft seat. A rotating plate is rotatably connected to the outer wall of the rotating shaft. A wheel axle is fixedly connected to the top of the rotating plate, and a pulley is rotatably connected to the top of the wheel axle. Two lock seats are fixedly connected to the top of the slide rail, and two pressure seats are fixedly connected to the top of the slide rail. A spring is fixedly connected to the top of the inner wall of each of the two pressure seats. A sliding shaft is slidably connected to the inner wall of each of the two lock seats. An inclined block is fixedly connected to the bottom of each of the two sliding shafts. A force-bearing plate is fixedly connected to the top of each of the two sliding shafts, and an unlocking mechanism is provided at the bottom of each of the two force-bearing plates.

[0006] The above technical solution involves connecting the door seat and slide rail to the pulley via a rotating plate, thus constructing the main structure of the self-locking door closer. All components work together to achieve the opening and closing of the door and the automatic locking function. The door seat is connected to the door to transmit motion, and the pulley moves on the slide rail to open and close the door. The pressure seat, spring, slide shaft, and inclined block work together to automatically lock when the door is opened to a specific position.

[0007] As a further description of the above technical solution:

[0008] The unlocking mechanism includes a lifting plate, the inner wall of which is slidably connected to the outer wall of two sliding shafts, a top plate slidably connected to the bottom of the lifting plate, a locking plate fixedly connected to the front side of the outer wall of the top plate, a locking hole opened on the outer wall of the locking plate, a locking block fixedly connected to the front side of the outer wall of the sliding rail, and a pin slidably connected to the inner wall of the locking block.

[0009] The above technical solution clarifies the specific structure of the unlocking mechanism. When it is necessary to unlock the door, the latch and lock plate can be operated to drive the lifting plate to move upward, thereby causing the sliding shaft and inclined block to rise, releasing the lock on the pulley, and realizing the free opening and closing of the door, providing a solution for door opening needs in special circumstances.

[0010] As a further description of the above technical solution:

[0011] A wall panel is fixedly connected to the rear side of the outer wall of the slide rail, and two positioning holes are opened on the left and right sides of the outer wall of the wall panel.

[0012] The above technical solution facilitates the secure installation of the sliding rail on the wall, and the positioning holes help to accurately determine the installation position during the installation process, improving installation efficiency and accuracy, ensuring that the self-locking door closer can function stably, and providing a reliable installation foundation for the entire device.

[0013] As a further description of the above technical solution:

[0014] Door panels are fixedly connected to the rear side of the outer wall of the door seat, and positioning pins are slidably connected to the left and right sides of the inner wall of the door panel.

[0015] The above technical solution achieves a stable connection between the door seat and the door. The positioning pin can slide inside the door panel to accurately position the door seat on the door, ensuring that the door seat is installed firmly and accurately, so that the door seat can better follow the movement of the door and transmit power.

[0016] As a further description of the above technical solution:

[0017] The inner wall of the door seat is threaded with a stud, and a top block is fixedly connected to the top of the stud.

[0018] The above technical solution utilizes the adjustability of the threaded connection to adjust the position of the stud within the door seat, thereby moving the top block. By adjusting the position of the top block, the effect on other components can be changed, thus achieving fine-tuning of the door closer's working state.

[0019] As a further description of the above technical solution:

[0020] An elastic rubber ring is fixedly connected to the top of the top block, and a nut is fixedly connected to the bottom of the stud.

[0021] Through the above technical solution, the elastic rubber ring can play a buffering role when the top block comes into contact with other components, reducing wear and noise between components, while increasing friction, which helps to stabilize the movement of related components. The nut allows the operator to adjust the position of the stud by rotating it, thereby controlling the pressure of the elastic rubber ring on other components.

[0022] As a further description of the above technical solution:

[0023] Two fixed seats are fixedly connected to the top front side of the slide rail, and a fixed shaft is fixedly connected to the inner wall of each of the two fixed seats.

[0024] The above technical solution provides a rotational support point for the top plate, enabling it to rotate around a fixed axis. During the operation of the unlocking mechanism, the rotation of the top plate around the fixed axis lifts the lifting plate, ensuring the normal operation of the unlocking mechanism.

[0025] As a further description of the above technical solution:

[0026] Two limiting buckles are fixedly connected to the front side of the outer wall of the slide rail, and a slide rod is rotatably connected to the right side of the outer wall of the pin. A limiting piece is fixedly connected to the outer wall of the slide rod.

[0027] The above technical solution, through the cooperation of the limit buckle and the limit piece, restricts the sliding range of the slide bar and the pin, ensuring that the movement of the pin is precise and controllable when operating the unlocking mechanism, avoiding malfunction of the unlocking mechanism due to excessive sliding, and ensuring the accuracy and reliability of the unlocking operation.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the sequential movement of the left and right inclined blocks during the opening and closing of the door locks the pulley in a specific position on the slide rail when the door is closed, thus realizing the self-locking function of the door closer. This prevents the door from shaking or being accidentally pushed open, ensuring the safety and privacy of the space. At the same time, the contact between the pulley and the inclined blocks during the movement causes the inclined blocks to drive the slide shaft and the force plate to move upward, thereby compressing the spring to store energy and providing power for subsequent actions.

[0030] 2. In this utility model, by pressing the locking plate down to a vertical position, the top plate rotates around the fixed axis and lifts the lifting plate, which in turn lifts the force plate and drives the inclined block to move upward and separate from the inner wall of the slide rail, so that the pulley can slide freely on the inner wall of the slide rail, thus successfully releasing the locking state of the door closer. Attached Figure Description

[0031] Figure 1 This is a perspective view of a self-locking door closer proposed in this utility model;

[0032] Figure 2 This is a front view of a self-locking door closer proposed in this utility model;

[0033] Figure 3 This is a partial structural exploded view of a self-locking door closer proposed in this utility model;

[0034] Figure 4 This is a partial structural cross-sectional view of a self-locking door closer proposed in this utility model;

[0035] Figure 5 This is a schematic diagram of the unlocking mechanism of a self-locking door closer proposed in this utility model.

[0036] Legend:

[0037] 1. Door seat; 2. Unlocking mechanism; 201. Lifting plate; 202. Top plate; 203. Lock plate; 204. Lock hole; 205. Lock block; 206. Pin; 3. Shaft seat; 4. Rotating shaft; 5. Rotating plate; 6. Wheel axle; 7. Pulley; 8. Slide rail; 9. Lock seat; 10. Pressure seat; 11. Spring; 12. Slide shaft; 13. Inclined block; 14. Force plate; 15. Wall panel; 16. Positioning hole; 17. Door panel; 18. Positioning pin; 19. Stud; 20. Top block; 21. Elastic rubber ring; 22. Nut; 23. Fixing seat; 24. Fixing shaft; 25. Limit buckle; 26. Slide rod; 27. Limiting piece. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] See attached document Figure 1 Appendix Figure 3 and attached Figure 4This utility model provides an embodiment of a self-locking door closer, comprising a door seat 1 and a slide rail 8. The door seat 1 is fixedly connected to the door, providing the installation base for the entire door closer. The slide rail 8 serves as the running track for the pulley 7, guiding the movement trajectory of the pulley 7 and ensuring smooth opening and closing of the door. A bearing seat 3 is fixedly connected to the top of the outer wall of the door seat 1, supporting and positioning the rotating shaft 4. The rotating shaft 4 is fixedly connected to the bottom of the inner wall of the bearing seat 3, providing the rotation center for the rotating plate 5, allowing the rotating plate 5 to rotate flexibly. The rotating plate 5 is rotatably connected to the outer wall of the rotating shaft 4. The rotating plate 5 transmits the movement of the door through rotation, driving the wheel axle 6 and pulley 7 to move. The wheel axle 6 is fixedly connected to the top of the rotating plate 5, supporting the pulley 7 and allowing it to rotate freely. The pulley 7 is rotatably connected to the top of the wheel axle 6, rolling within the slide rail 8 to achieve smooth opening and closing of the door. The top of the slide rail 8 is fixedly connected to... There are two lock seats 9, which provide a sliding track for the sliding shaft 12 to realize the locking function. The top of the sliding track 8 is fixedly connected to two pressure seats 10. The pressure seats 10 interact with the pulley 7 to trigger the subsequent locking action. The top of the inner wall of each of the two pressure seats 10 is fixedly connected to a spring 11. The spring 11 is used to store and release energy to assist in locking and unlocking. The inner wall of each of the two lock seats 9 is slidably connected to the sliding shaft 12. The sliding shaft 12 moves up and down in the lock seat 9, driving the inclined block 13 to realize the locking and unlocking operation. The bottom of each of the two sliding shafts 12 is fixedly connected to the inclined block 13. The inclined block 13, through cooperation with the pulley 7, realizes the locking and unlocking function of the door. The top of each of the two sliding shafts 12 is fixedly connected to a force plate 14. The force plate 14 is used to transmit the force of the spring 11 and receive the pressure of the pulley 7 to drive the sliding shaft 12 to move. The bottom of the two force plates 14 is provided with an unlocking mechanism 2.

[0040] Specifically, when the door is opened, the door seat 1 rotates with the door, and the pivot 3 and the rotating shaft 4 on the door seat 1 rotate synchronously. At the same time, the rotating plate 5 rotates around the rotating shaft 4. Under the traction of the rotating shaft 4, the pulley 7 slides to the right in the inner wall of the slide rail 8. When the door is fully opened, the pulley 7 slides to the middle of the inner wall of the slide rail 8. During this process, the pulley 7 contacts the inclined surface of the left inclined block 13 and moves upward under the pressure of the pulley 7. The inclined block 13 drives the sliding shaft 12 and the force plate 14 to move upward synchronously. The bottom end of the spring 11 is fixed to the top of the force plate 14. When the force plate 14 moves upward, the spring 11 is compressed. When the pulley 7 slides to the middle of the slide rail 8, the pulley 7 moves to the middle of the inner wall of the slide rail 8. When the door is in the middle of the inner wall of the slide rail 8, the inclined block 13 falls, and its right curved surface fits the shape of the outer wall of the pulley 7. Under the elastic force of the spring 11, the bottom surface of the inclined block 13 presses tightly against the bottom of the inner wall of the slide rail 8. When the door is closed at this time, due to the obstruction of the left inclined block 13, the pulley 7 cannot slide to the left and return to its original position. The pulley 7 continues to slide. When the door is closed, the pulley 7 slides into the right end of the inner wall of the slide rail 8. During this process, the movement between the pulley 7 and the right inclined block 13 is consistent with that of the left inclined block 13. The right inclined block 13 locks the pulley 7 in the current position, and the pulley 7 can no longer slide, thereby achieving the self-locking function of the door closer.

[0041] See attached document Figure 2 Appendix Figure 4 and attached Figure 5The unlocking mechanism 2 includes a lifting plate 201, the inner wall of which is slidably connected to the outer walls of two sliding shafts 12, thereby enabling the lifting plate 201 to move up and down on the sliding shafts 12, thus allowing control of the sliding shafts 12 and related components. A top plate 202 is slidably connected to the bottom of the lifting plate 201, and the top plate 202 can rotate flexibly at the bottom of the lifting plate 201, providing conditions for subsequent triggering of the lifting action. A locking plate 203 is fixedly connected to the front side of the outer wall of the top plate 202. The locking plate 203 is used to cooperate with the locking block 205 and the pin 206 to perform the key operations of locking and unlocking. A lock hole 204 is provided on the outer wall of the locking plate 203. A locking block 205 is fixedly connected to the front side of the outer wall of the slide rail 8. A pin 206 is slidably connected to the inner wall of the locking block 205. The pin 206 slides within the locking block 205, and the lock hole 204 is used to cooperate with the locking block 205. By inserting and pulling out the pin 206, the locking plate 201 can be locked. 3. Fixing and changing the position: Two fixed seats 23 are fixedly connected to the top front side of the slide rail 8. The fixed seats 23 are used to support and fix the fixed shaft 24 to ensure its stable position. The inner walls of the two fixed seats 23 are fixedly connected to the fixed shaft 24. The fixed shaft 24 provides the rotation center of the top plate 202, so that the top plate 202 can rotate around it to realize the action of lifting the lifting plate 201. Two limit buckles 25 are fixedly connected to the front side of the outer wall of the slide rail 8. The limit buckles 25 are used to limit the sliding range of the slide rod 26 to ensure the accuracy of unlocking and locking operations. The right side of the outer wall of the pin 206 is rotatably connected to the slide rod 26. The slide rod 26 is used to drive the pin 206 to move. The position of the pin 206 can be controlled by manually operating the slide rod 26. The outer wall of the slide rod 26 is fixedly connected to the limit piece 27. The limit piece 27 cooperates with the limit buckle 25 to prevent the slide rod 26 from sliding excessively and to ensure the normal operation of the unlocking mechanism 2.

[0042] Specifically, the lifting plate 201 is located on the outer wall of the two sliding shafts 12, between the lock seat 9 and the force plate 14. The inner wall of the top plate 202 is engaged with the fixed shaft 24, allowing the top plate 202 to rotate around the fixed shaft 24. The width of the lock hole 204 is greater than the width of the lock block 205. Initially, the top plate 202 is horizontal, the top of the lock block 205 is inside the lock hole 204, the upper rod-shaped structure of the pin 206 is connected to the bottom of the lock plate 203, the sliding rod 26 is on the inner wall of the left limit buckle 25, and the limit piece 27 is connected to the outer wall of the left limit buckle 25. When it is necessary to release the lock, the pin 206 is pushed up to be flush with the opening of the limit buckle 25 and then slid to the right to engage with the outer wall of the right side. At this time, the sliding rod 26 drives the pin 206 to move to the right, and the rod-shaped structure of the pin 206 disengages from the inner wall of the lock block 205. Then, the lock plate 203 is pressed down. To reach the vertical position, during this process, the top plate 202 rotates around the fixed axis 24, and its rear side gradually approaches the bottom of the lifting plate 201. When the locking plate 203 is completely vertical, the top plate 202 pushes the lifting plate 201 upward, and the top of the lifting plate 201 pushes the force plates 14 on both sides upward, thereby causing the inclined block 13 to move upward and disengage from the inner wall of the slide rail 8. At this time, the pulley 7 can slide on the inner wall of the slide rail 8, thereby releasing the lock. At this time, the outer wall of the locking plate 203 is in close contact with the front wall of the slide rail 8, while the spring 11 presses the force plate 14. The force plate 14 exerts a downward force on the lifting plate 201, causing the slide rod 26 to return along the original path. At this time, the lower rod-shaped structure of the pin 206 is inserted into the inner wall of the locking block 205 and contacts the outer wall of the locking plate 203, fixing it in the current position, thereby preventing the lifting plate 201 from moving downward and causing the inclined block 13 to affect the sliding of the pulley 7.

[0043] See attached document Figure 1 Appendix Figure 2 and attached Figure 3A wall panel 15 is fixedly connected to the rear side of the outer wall of the slide rail 8. The wall panel 15 is used to connect to the wall surface, providing a stable installation base for the self-locking door closer, so that the slide rail 8 can be firmly fixed to the wall. Two positioning holes 16 are opened on the left and right sides of the outer wall of the wall panel 15. The positioning holes 16 facilitate the determination of the installation position of the wall panel 15 on the wall during the installation process by using positioning pins 18, improving the installation accuracy. A door panel 17 is fixedly connected to the rear side of the outer wall of the door base 1. The door panel 17 allows the door base 1 to be firmly fixed to the door. Positioning pins 18 are slidably connected to the left and right sides of the inner wall of the door panel 17. The positioning pins 18 fix the door panel 17 in the accurate position of the door. The inner wall of the seat 1 is threaded with a stud 19. The stud 19 can be adjusted in position within the seat 1 through the threaded connection, thereby controlling the position of the parts connected to the stud 19. A top block 20 is fixedly connected to the top of the stud 19. The top block 20 is used to transmit the movement of the stud 19 and convert the rotational motion of the stud 19 into a vertical pressing action. An elastic rubber ring 21 is fixedly connected to the top of the top block 20. The top of the elastic rubber ring 21 contacts the bottom of the rotating plate 5, which plays a role in buffering and increasing friction. A nut 22 is fixedly connected to the bottom of the stud 19. The nut 22 is used to facilitate the operator to adjust the position of the stud 19, thereby adjusting the pressure of the elastic rubber ring 21 on the rotating plate 5.

[0044] Specifically, the wall panel 15 is fixed to the rear side of the outer wall of the slide rail 8. Through the positioning holes 16 on the left and right sides, and with the help of the positioning pins 18, it is precisely installed in the wall, providing a stable foundation for the entire device and ensuring that the slide rail 8 is firmly fixed to the wall. The door panel 17 is connected to the rear side of the outer wall of the door seat 1. With the help of the positioning pins 18, it is precisely installed with the door, so that the door seat 1 is firmly fixed to the door. The stud 19 is threaded to the inner wall of the door seat 1. The operator can adjust its position by rotating the nut 22, which in turn drives the top block 20 and the elastic rubber ring 21 connected to it. The top of the elastic rubber ring 21 contacts the bottom of the rotating plate 5, which not only plays a buffering role when the rotating plate 5 moves, reducing vibration and noise, but also increases friction, which helps the rotating plate 5 to operate stably.

[0045] Working principle: When the door opens, the door seat 1 rotates with the door. The shaft seat 3 and the rotating shaft 4 on the door seat 1 rotate synchronously. The rotating plate 5 rotates around the rotating shaft 4. Under the traction of the rotating shaft 4, the pulley 7 begins to move along the slide rail 8. When the door is fully open, the pulley 7 slides to the middle of the inner wall of the slide rail 8. During this process, the pulley 7 contacts the inclined surface of the left inclined block 13. Under the pressure of the pulley 7, the inclined block 13 drives the sliding shaft 12 and the force plate 14 to move upward synchronously. At the same time, during the process of the pulley 7 moving to the right, the top of the pulley 7 contacts the bottom surface of the inclined block 13. Because the bottom end of the spring 11 is fixed to the top of the force plate 14, when the force plate 14 moves upward, the spring 11 is compressed and stores energy. When the pulley 7 slides to the inner wall of the slide rail 8... In the middle section, the bottom of the inclined block 13 no longer contacts the top of the pulley 7. Under the pressure of the spring 11, the inclined block 13 falls rapidly, and its right curved surface fits the shape of the outer wall of the pulley 7. Under the elastic force of the spring 11, the bottom surface of the inclined block 13 presses tightly against the bottom of the inner wall of the slide rail 8. When the door is closed, due to the obstruction of the left inclined block 13, the pulley 7 cannot slide to the left to return to its original position and can only continue to slide to the right. When the door is closed, the pulley 7 slides into the right end of the inner wall of the slide rail 8. During this process, the movement between the pulley 7 and the right inclined block 13 is consistent with the previous movement with the left inclined block 13. The right inclined block 13 finally locks the pulley 7 in the current position, and the pulley 7 can no longer slide, thus realizing the self-locking function of the door closer.

[0046] In the initial state, the lifting plate 201 is located on the outer wall of the two sliding shafts 12, between the lock seat 9 and the force plate 14. The inner wall of the top plate 202 is engaged with the fixed shaft 24, and the top plate 202 is in a horizontal state. The top of the locking block 205 is inside the lock hole 204. The upper rod-shaped structure of the pin 206 is connected to the bottom of the lock plate 203. The sliding rod 26 is on the inner wall of the left limiting buckle 25, and the limiting piece 27 is connected to the outer wall of the left limiting buckle 25. When it is necessary to release... When the door is locked, for example, when medical staff need to push large medical equipment into a ward and the door needs to be fully open without being restricted by the lock, the sliding rod 26 is pushed up to be level with the opening of the limit latch 25 and slid to the right until it contacts the outer wall of the right limit latch 25. During this process, the sliding rod 26 drives the bolt 206 to move to the right, and the rod-shaped structure of the bolt 206 disengages from the inner wall of the locking block 205. Then, the locking plate 203 is pressed down to a vertical position. In this action, the top plate 202 rotates around the fixed axis 24, and its rear side gradually approaches the bottom of the lifting plate 201. When the locking plate 203 is completely vertical, the top plate 202 pushes the lifting plate 201 upward. Since the top of the lifting plate 201 is in contact with the force plates 14 on both sides, it will push the force plates 14 upward, thereby causing the inclined block 13 to move upward and disengage from the inner wall of the slide rail 8. At this time, the pulley 7 can slide freely on the inner wall of the slide rail 8, and the locking state of the door closer is released. At this point, the outer wall of the locking plate 203 is in close contact with the front wall of the slide rail 8, while the spring 11 presses against the force plate 14. The force plate 14 exerts a downward force on the lifting plate 201. In order to prevent the lifting plate 201 from moving down and causing the inclined block 13 to affect the sliding of the pulley 7, the slide rod 26 is returned along the original path, so that the lower rod-shaped structure of the pin 206 is inserted into the inner wall of the locking block 205 and contacts the outer wall of the locking plate 203, fixing the locking plate 203 in the current position and ensuring the stability of the unlocked state.

[0047] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-locking door closer, comprising a door seat (1) and a slide rail (8), characterized in that: A shaft seat (3) is fixedly connected to the top of the outer wall of the door seat (1). A rotating shaft (4) is fixedly connected to the bottom of the inner wall of the shaft seat (3). A rotating plate (5) is rotatably connected to the outer wall of the rotating shaft (4). A wheel axle (6) is fixedly connected to the top of the rotating plate (5). A pulley (7) is rotatably connected to the top of the wheel axle (6). Two lock seats (9) are fixedly connected to the top of the slide rail (8). Two pressure seats (10) are fixedly connected to the top of the slide rail (8). A spring (11) is fixedly connected to the top of the inner wall of each of the two pressure seats (10). A sliding shaft (12) is slidably connected to the inner wall of each of the two lock seats (9). An inclined block (13) is fixedly connected to the bottom of each of the two sliding shafts (12). A force plate (14) is fixedly connected to the top of each of the two sliding shafts (12). An unlocking mechanism (2) is provided at the bottom of each of the two force plates (14).

2. The self-locking door closer according to claim 1, characterized in that: The unlocking mechanism (2) includes a lifting plate (201), the inner wall of which is slidably connected to the outer wall of two sliding shafts (12), the bottom of which is slidably connected to a top plate (202), a locking plate (203) is fixedly connected to the front side of the outer wall of the top plate (202), a locking hole (204) is provided on the outer wall of the locking plate (203), a locking block (205) is fixedly connected to the front side of the outer wall of the slide rail (8), and a pin (206) is slidably connected to the inner wall of the locking block (205).

3. A self-locking door closer according to claim 1, characterized in that: The slide rail (8) is fixedly connected to a wall panel (15) on the rear side of its outer wall. Two positioning holes (16) are opened on the left and right sides of the outer wall of the wall panel (15).

4. A self-locking door closer according to claim 1, characterized in that: The door panel (17) is fixedly connected to the rear side of the outer wall of the door seat (1), and the positioning pin (18) is slidably connected to the left and right sides of the inner wall of the door panel (17).

5. A self-locking door closer according to claim 1, characterized in that: The inner wall of the door seat (1) is threaded with a stud (19), and a top block (20) is fixedly connected to the top of the stud (19).

6. A self-locking door closer according to claim 5, characterized in that: The top of the top block (20) is fixedly connected to an elastic rubber ring (21), and the bottom of the stud (19) is fixedly connected to a nut (22).

7. A self-locking door closer according to claim 1, characterized in that: The top front side of the slide rail (8) is fixedly connected to two fixed seats (23), and the inner walls of the two fixed seats (23) are fixedly connected to fixed shafts (24).

8. A self-locking door closer according to claim 2, characterized in that: Two limit buckles (25) are fixedly connected to the front side of the outer wall of the slide rail (8), and a slide rod (26) is rotatably connected to the right side of the outer wall of the pin (206). A limit piece (27) is fixedly connected to the outer wall of the slide rod (26).

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