Positioning and releasing device for connecting rod of door closer

Abstract

The utility model provides a door closer connecting rod positioning and releasing device which comprises a first mechanism, a second mechanism, a base and an upper cover, the first mechanism comprises a first positioning unit and a connecting rod rotating shaft assembly, the first positioning unit is provided with a locking part, and the connecting rod rotating shaft assembly comprises a rotating shaft, a second positioning unit and a limiting rod. The second positioning unit is arranged on the rotating shaft in a sleeving manner, a groove matched with the locking part is formed in the second positioning unit, the limiting rod is in threaded connection with the second positioning unit and the rotating shaft in sequence, the second mechanism is an electromagnetic driving unit, and when the electromagnetic driving unit locks the first positioning unit at the initial position, the locking part is clamped into the groove, and the limiting rod is in threaded connection with the second positioning unit. When the electromagnetic driving unit releases the first positioning unit from the initial position, the locking part is separated from the groove, by means of the structure, locking of the door closer connecting rod is stable and reliable, the response speed is high during unlocking, manual on-site operation is not needed, the opening angle of a fireproof door can be adjusted, and user requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of fire-fighting equipment technology, and in particular to a positioning and release device for a door closer linkage. Background Technology

[0002] Fire doors consist of a fixed door frame and a door body that is rotatably connected to the door frame. Fire door closers open and close the door body by locking and unlocking the door closer linkage. Existing linkage-type door closers usually cannot achieve automatic unlocking of the door closer linkage, and usually do not support free adjustment of the opening angle or are complicated to operate, which cannot meet the needs of users who need to flexibly control the opening angle (such as in hospitals, warehouses, residences, office buildings, etc.). Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a positioning and release device for a door closer linkage, which can automatically release the door closer linkage to avoid safety hazards and flexibly control the opening angle to meet user needs.

[0004] To achieve the above objectives, the technical solution adopted in this application embodiment is: a positioning and release device for a door closer linkage, comprising:

[0005] The system comprises a first mechanism, a second mechanism, a base, and a top cover, wherein the first mechanism is fixedly mounted on the base.

[0006] The first mechanism includes a first positioning unit and a connecting rod shaft assembly, and the first positioning unit is provided with a locking part;

[0007] The linkage shaft assembly includes a shaft, a second positioning unit, and a limiting rod. The shaft is vertically and rotatably connected to the base. The shaft is fixedly connected to the connecting rod of the door closer, and the connecting rod is perpendicular to the shaft. When the connecting rod rotates along the circumferential direction of the shaft, it drives the shaft to rotate. The second positioning unit is sleeved on the shaft and has a groove that mates with the locking part. The limiting rod is threadedly connected to the shaft, and the limiting end of the limiting rod is located on the side of the second positioning unit away from the root of the shaft, thus limiting the second positioning unit.

[0008] The second mechanism is an electromagnetic drive unit, which is fixed on the base. The electromagnetic drive unit locks the first positioning unit in the initial position or releases it from the initial position. When the electromagnetic drive unit locks the first positioning unit in the initial position, the locking part is engaged in the groove. When the electromagnetic drive unit releases the first positioning unit from the initial position, the locking part is disengaged from the groove.

[0009] Specifically, the second positioning unit includes a base plate, a door opening detection plate, and a nut. The base plate and the door opening detection plate are fixedly connected. The groove is formed on the base plate, or the groove is formed on the assembly of the base plate and the door opening detection plate. The door opening detection plate is located on the side of the base plate away from the root of the rotating shaft. The nut is located on the side of the door opening detection plate away from the base plate. The nut is threadedly connected to the limiting rod. The base plate is provided with a first meshing structure on the side near the root of the rotating shaft. The first meshing structure has at least two teeth. The second meshing structure has at least two teeth that cooperate with the first meshing structure.

[0010] Preferably, the second positioning unit includes a base plate, a door opening detection plate, and a nut. The base plate and the door opening detection plate are fixedly connected. The groove is formed on the base plate, or the groove is formed on the assembly of the base plate and the door opening detection plate. The door opening detection plate is located on the side of the base plate away from the root of the rotating shaft. The nut is located on the side of the door opening detection plate away from the base plate. The outer peripheral wall of the end of the rotating shaft away from the root of the rotating shaft is threaded. The nut is threadedly connected to the rotating shaft. The side of the base plate near the root of the rotating shaft is provided with a first meshing structure. The root of the rotating shaft is provided with a second meshing structure that cooperates with the first meshing structure. The first meshing structure has at least two teeth, and the second meshing structure has at least two teeth that cooperate with the first meshing structure.

[0011] Specifically, the root of the rotating shaft is provided with a second meshing structure that cooperates with the first meshing structure, and the base plate, the door opening position detection plate and the nut are integrally formed or any two of the base plate, the door opening position detection plate and the nut are integrally formed.

[0012] Specifically, the first meshing structure has 360 first teeth, and the second meshing structure has 360 second teeth that cooperate with the first teeth.

[0013] Specifically, the locking part is a sphere, and the first positioning unit further includes a first control rod, a first spring, a second spring, and a ball cup. The first control rod has an annular boss in the middle. One end of the first spring is sleeved on the outer peripheral wall of the first control rod, and the other end of the first spring is sleeved on the outer peripheral wall of the ball cup. The second spring and the sphere are sequentially installed inside the ball cup. The end of the ball cup away from the first control rod is provided with a first annular limiting piece. The end of the ball cup near the first control rod is fixedly connected to the first control rod. Under the elastic force of the second spring, a part of the sphere protrudes outside the ball cup. Under the restriction of the first annular limiting piece, the sphere cannot be completely removed from the ball cup.

[0014] Preferably, the locking part is a sphere, and the first positioning unit further includes a second control rod, a fourth spring, a fifth spring, a top plate, and a second adjusting rod. The second control rod is tubular and has an annular boss in the middle. The fourth spring is sleeved on the outer peripheral wall of the second control rod near the sphere. The sphere, the fifth spring, and the top plate are sequentially installed inside the second control rod. A second annular limiting piece is provided on the end of the second control rod near the sphere. Under the elastic force of the fifth spring, a portion of the sphere protrudes outside the second control rod. The sphere cannot be completely removed from the second control rod under the restriction of the second annular limiting piece. The second adjusting rod is located on the side of the second control rod away from the sphere and is threadedly connected to the second control rod. When the second adjusting rod rotates clockwise, it pushes the top plate to move closer to the sphere within the second control rod.

[0015] Specifically, the base is also provided with a fixed shaft. The electromagnetic drive unit includes an electromagnet assembly, an electric control rod, a rocker arm, and a third spring. The electric control rod has an abutment portion at one end away from the electromagnet assembly. The third spring is sleeved on the outer peripheral wall of the electric control rod, with one end abutting against the abutment portion and the other end abutting against the electromagnet assembly. The rocker arm has a first end and a second end. The first end is rotatably connected to the electric control rod. The fixed shaft is located between the electric control rod and the first mechanism and is rotatably connected to the middle of the rocker arm. The abutment portion is located at the third spring... Under the action of elastic force, the first positioning unit is located at the set position A. The second end presses against the upper surface of the annular boss, locking the first positioning unit in the initial position. When the electromagnetic drive unit is energized, the electromagnetic drive unit drives the electric control rod to retract to the set position B in the direction close to the electromagnetic drive unit. The electric control rod drives the first end to rotate counterclockwise along the fixed axis to the set position C. The second end leaves the upper surface of the annular boss, releasing the first positioning unit from the initial position. After the first positioning unit is released from the initial position, the second end abuts against the side surface of the annular boss.

[0016] Specifically, the second mechanism is further provided with a temperature control drive unit, which includes a temperature-sensing glass ball, a ball groove, and a torsion spring. The ball groove is located on the upper cover, and the temperature-sensing glass ball is fixed in the ball groove. One end of the torsion spring abuts against the upper cover, and the other end of the torsion spring presses against the temperature-sensing glass ball. When the external temperature reaches a certain value, the temperature-sensing glass ball bursts. The torsion spring presses down on the burst end of the temperature-sensing glass ball and moves it downwards, pressing it against the first end. The torsion force of the torsion spring drives the first end to rotate counterclockwise along the fixed shaft 31 to a set position C. The second end leaves the upper surface of the annular boss, releasing the first positioning unit from its initial position. After the first positioning unit is released from its initial position, the second end abuts against the side surface of the annular boss.

[0017] Due to the adoption of the above structure, the beneficial effects of this utility model compared with the prior art are as follows:

[0018] This invention achieves physical locking by engaging the locking part of the first positioning unit with the groove of the second positioning unit, and unlocks it by using an electromagnetic drive unit. Locking is stable and reliable, and unlocking is fast, requiring no manual on-site operation. Furthermore, the invention utilizes a multi-tooth design on the first and second meshing structures to adjust the locking position of the door closer linkage, thereby enabling adjustable opening angles of the fire door. This makes it suitable for a wider range of work scenarios (such as hospitals, warehouses, residences, and office buildings). Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model.

[0021] Figure 2 This is a schematic diagram of the electromagnetic drive unit releasing the first positioning unit from its initial position according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the electromagnetic drive unit locking the first positioning unit in the initial position according to an embodiment of the present invention.

[0023] Figure 4 This is an exploded view of the second positioning unit in an embodiment of the present invention.

[0024] Figure 5This is an exploded view of the second positioning unit from another angle in an embodiment of this utility model.

[0025] Figure 6 This is a schematic diagram of the first positioning unit from another angle in an embodiment of this utility model. Figure 1 .

[0026] Figure 7 This is a schematic diagram of the first positioning unit from another angle in an embodiment of this utility model. Figure 2 .

[0027] Figure 8 This is an exploded view of the top cover according to an embodiment of the present utility model. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] like Figure 1-6 As shown in the figure, an embodiment of the present invention provides a positioning and release device for a door closer linkage, comprising:

[0030] The first mechanism 1, the second mechanism 2, the base 3 and the upper cover 4 are fixed on the base 3 and the upper cover 4 is closed on the base 3.

[0031] The first mechanism 1 includes a first positioning unit 11 and a connecting rod shaft assembly 12, and the first positioning unit 11 is provided with a locking part 111;

[0032] The linkage shaft assembly 12 includes a shaft 121, a second positioning unit 122, and a limiting rod 123. The shaft 121 is vertically and rotatably connected to the base 3. The shaft is fixedly connected to the connecting rod of the door closer, and the connecting rod (not shown) is perpendicular to the shaft. When the connecting rod (not shown) rotates along the circumferential direction of the shaft 121, the connecting rod (not shown) drives the shaft 121 to rotate. The second positioning unit 122 is sleeved on the shaft 121. The second positioning unit 122 is provided with a groove 1221 that cooperates with the locking part 111. The limiting end (not shown) of the limiting rod 123 is located on the side of the second positioning unit 122 away from the root of the shaft 121. The limiting end (not shown) limits the second positioning unit 122.

[0033] The second mechanism 2 is an electromagnetic drive unit 21, which is fixed on the base 3. The electromagnetic drive unit 21 locks the first positioning unit 11 in the initial position or releases it from the initial position. When the electromagnetic drive unit 21 locks the first positioning unit 11 in the initial position, the locking part 111 is engaged in the groove 1221. When the electromagnetic drive unit 21 releases the first positioning unit 11 from the initial position, the locking part 111 is disengaged from the groove 1221.

[0034] This invention achieves physical locking by engaging the locking part 111 of the first positioning unit 11 into the groove 1221 of the second positioning unit 122, and unlocks it by engaging the electromagnetic drive unit 21. The locking is stable and reliable, and the unlocking is fast, requiring no manual on-site operation.

[0035] Specifically, refer to Figure 4 , Figure 5 The second positioning unit 122 includes a base plate 1222, a door opening detection plate 1223, and a nut 1224. The base plate 1222 and the door opening detection plate 1223 are fixedly connected. A groove 1221 is formed on the base plate 1222, or the groove 1221 is formed on the assembly of the base plate 1222 and the door opening detection plate 1223. The door opening detection plate 1223 is located on the side of the base plate 1222 away from the root of the rotating shaft 121. The nut 1224 is located on the side of the door opening detection plate 1223 away from the base plate 1222. The nut 1224 is threadedly connected to the limiting rod 123. A first engagement structure (not shown) is provided on the side of the base plate 1222 near the root of the rotating shaft 121. A second engagement structure (not shown) is provided at the root of the rotating shaft 121 to cooperate with the first engagement structure. The first engagement structure (not shown) has up to The second engagement structure (not shown) has at least two teeth (not shown) that cooperate with the first engagement structure. When the nut 1224 rotates clockwise on the limiting rod 123, the nut 1224 moves axially along the limiting rod 123 toward the root of the rotating shaft 121. The nut 1224 pushes the door opening detection plate 1223 and the base plate 1222 toward the root of the rotating shaft 121. When the nut 1224 rotates clockwise and moves axially along the limiting rod 123 to the set position D, the first engagement structure (not shown) engages with the second engagement structure (not shown). The second positioning unit 122 is locked to the rotating shaft 121 through the base plate 1222. With this configuration, the angle between the connecting rod (not shown) and the bottom edge or the extension line of the bottom edge of the base 3 can be adjusted, thereby adjusting the door opening position of the fire door.

[0036] Preferably, refer to Figure 4 , Figure 5The second positioning unit 122 includes a base plate 1222, a door opening detection plate 1223, and a nut 1224. The base plate 1222 and the door opening detection plate 1223 are fixedly connected. A groove 1221 is formed on the base plate 1222, or the groove 1221 is formed on the assembly of the base plate 1222 and the door opening detection plate 1223. The door opening detection plate 1223 is located on the side of the base plate 1222 away from the root of the rotating shaft 121. The nut 1224 is located on the side of the door opening detection plate 1223 away from the base plate 1222. The outer peripheral wall of the end of the rotating shaft 121 away from the root of the rotating shaft 121 is threaded. The nut 1224 is threadedly connected to the rotating shaft 121. The side of the base plate 1222 near the root of the rotating shaft 121 is provided with a first engagement structure. The root of the rotating shaft 121 is provided with a structure that cooperates with the first engagement structure. The second meshing structure has at least two teeth in the first meshing structure and at least two teeth that cooperate with the first meshing structure. When the nut 1224 rotates clockwise on the rotating shaft 121, the nut 1224 moves axially along the rotating shaft 121 towards the root of the rotating shaft 121. The nut 1224 pushes the door opening detection plate 1223 and the base plate 1222 towards the root of the rotating shaft 121. When the nut 1224 rotates clockwise and moves axially along the rotating shaft 121 to the set position E, the first meshing structure (not shown) meshes with the second meshing structure (not shown), and the second positioning unit 122 is locked to the rotating shaft 121 through the base plate 1222. With this setting, the angle between the connecting rod (not shown) and the bottom edge or the extension line of the bottom edge of the base 3 can be adjusted, thereby adjusting the door opening position of the fire door.

[0037] Specifically, the base plate 1222, the door opening position detection plate 1223, and the nut 1224 are integrally formed, or any two of the base plate 1222, the door opening position detection plate 1223, and the nut 1224 are integrally formed.

[0038] Specifically, the first engagement structure (not shown) has 360 first teeth (not shown), and the second engagement structure (not shown) has 360 second teeth (not shown) that cooperate with the first teeth (not shown). This arrangement allows for more precise adjustment of the angle between the connecting rod (not shown) and the bottom edge or the extension line of the bottom edge of the base 3 in 1-degree increments, thereby more precisely adjusting the opening position of the fire door.

[0039] Specifically, refer to Figure 6The locking part 111 is a sphere 1111. The first positioning unit 11 also includes a first control rod 112, a first spring 113, a second spring 114, and a ball cup 115. The first control rod 112 has an annular boss 1121 in the middle. One end of the first spring 113 is sleeved on the outer peripheral wall of the first control rod 112, and the other end of the first spring 113 is sleeved on the outer peripheral wall of the ball cup 115. The second spring 114 and the sphere 1111 are sequentially installed inside the ball cup 115. The end of the ball cup 115 away from the first control rod 112 has a first annular limiting piece 1151. The ball cup 115 is positioned near... One end of the ball 1111 is fixedly connected to the first control lever 112. Under the elastic force of the second spring 114, a portion of the ball 1111 protrudes outside the cup 115. The ball 1111 cannot be completely removed from the cup 115 under the restriction of the first annular limiting piece 1151. With this configuration, when a person applies a certain amount of force to the connecting rod (not shown) to drive the rotating shaft 121 and the second positioning unit 122 to rotate, the ball 1111 will be laterally subjected to force, causing the ball to move into the cup 115, and finally causing the ball 1111 to be removed from the groove 1221, thereby achieving manual forced unlocking.

[0040] Preferred, refer to Figure 7 The locking part 111 is a sphere 1111. The first positioning unit 11 also includes a second control rod 116, a fourth spring 117, a fifth spring 118, a top plate 119, and a second adjusting rod 120. The second control rod 116 is tubular and has an annular boss 1121 in the middle. The fourth spring 117 is sleeved on the outer peripheral wall of the second control rod 116 near the sphere 1111. The sphere 1111, the fifth spring 118, and the top plate 119 are sequentially installed inside the second control rod 116. A second annular limiting piece (not shown) is provided on the end of the second control rod 116 near the sphere 1111. The sphere 1111 is positioned under the fifth spring 116. Under the elastic force of 8, a portion of the ball 1111 is exposed outside the second control rod 116. The ball 1111 cannot be completely removed from the second control rod 116 under the restriction of the second annular limiting piece (not shown). The second adjusting rod 120 is located on the side of the second control rod 116 away from the ball 1111 and is threadedly connected to the second control rod 116. When the second adjusting rod 120 rotates clockwise, it pushes the top plate 119 to move closer to the ball 1111 in the second control rod 116. This arrangement can adjust the force applied by the fifth spring 118 to the ball 1111, thereby adjusting the clamping force between the ball 1111 and the groove 1221.

[0041] Specifically, refer to Figure 1 , Figure 2The base 3 is equipped with a fixed shaft 31. The electromagnetic drive unit 21 includes an electromagnet assembly 211, an electric control rod 212, a rocker 213, and a third spring 214. The end of the electric control rod 212 away from the electromagnet assembly 211 has an abutment part 2121. The third spring 214 is sleeved on the outer peripheral wall of the electric control rod 212. One end of the third spring 214 abuts against the abutment part 2121, and the other end of the third spring 214 abuts against the electromagnet assembly 211. The rocker 213 has a first end 2131 and a second end 2132. The first end 2131 is rotatably connected to the electric control rod 212. The fixed shaft 31 is located between the electric control rod 212 and the first mechanism 1 and is rotatably connected to the middle of the rocker 213. The abutment part 2121 is located at a set position A under the action of the elastic force of the third spring 214. Under the action of the rocker principle, the second end 2131... 32 presses against the upper surface of the annular boss 1121, locking the first positioning unit 11 in the initial position; when the electromagnetic drive unit 21 is energized, the electromagnetic drive unit 21 drives the electric control rod 212 to retract to the set position B in the direction close to the electromagnetic drive unit 21. The electric control rod 212 drives the first end 2131 to rotate counterclockwise along the fixed shaft 31 to the set position C, and the second end 2132 leaves the upper surface of the annular boss 1121, releasing the first positioning unit 11 from the initial position. After the first positioning unit 11 is released from the initial position, the second end 2132 abuts against the side surface of the annular boss 1121. With this setting, the first positioning unit 11 can be automatically released from the initial position, thereby realizing the automatic unlocking of the first positioning unit 11 and the second positioning unit, that is, realizing the automatic unlocking of the door closer linkage (not shown).

[0042] Specifically, refer to Figure 1 , Figure 3 and Figure 8 The second mechanism 2 is also equipped with a temperature control drive unit 22, which includes a temperature-sensing glass ball 221, a ball groove 222, and a torsion spring 223. The ball groove 222 is fixed to the upper cover 4, the temperature-sensing glass ball 221 is fixed inside the ball groove 222, one end of the torsion spring 223 abuts against the upper cover 4, and the other end of the torsion spring 223 presses against the temperature-sensing glass ball 221. When the external temperature reaches a certain value, the temperature-sensing glass ball 221 bursts, and the torsion spring 223 presses down on the burst end of the temperature-sensing glass ball 221 and moves downwards, pressing against the first end 2131. The torsion spring force drives the first end 2131 to rotate counterclockwise along the fixed shaft 31 to the set position C, and the second end 2132 leaves the upper surface of the annular boss 1121, releasing the first positioning unit 11 from the initial position. After the first positioning unit 11 is released from the initial position, the second end 2132 abuts against the side surface of the annular boss 1121. With this setting, when the outside temperature reaches a certain value in the event of a fire, the first positioning unit 11 and the second positioning unit will automatically unlock, that is, the door closer linkage (not shown) will automatically unlock, thereby realizing the automatic closing of the fire door.

[0043] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A positioning and release device for a door closer linkage, characterized in that: It includes a first mechanism (1), a second mechanism (2), a base (3) and a top cover (4), wherein the first mechanism (1) is fixed on the base (3) and the top cover (4) is closed on the base (3); The first mechanism (1) includes a first positioning unit (11) and a connecting rod shaft assembly (12), and the first positioning unit (11) is provided with a locking part (111); The connecting rod shaft assembly (12) includes a shaft (121), a second positioning unit (122), and a limiting rod (123). The shaft (121) is vertically and rotatably connected to the base (3). The shaft (121) is fixedly connected to the connecting rod of the door closer, and the connecting rod is perpendicular to the shaft (121). When the connecting rod rotates along the circumferential direction of the shaft (121), the connecting rod drives the shaft (121) to rotate. The second positioning unit (122) is sleeved on the shaft (121). The second positioning unit (122) is provided with a groove (1221) that cooperates with the locking part (111). The limiting rod (123) is threadedly connected to the shaft (121). The limiting end of the limiting rod (123) is located on the side of the second positioning unit (122) away from the root of the shaft (121). The limiting end limits the second positioning unit (122). The second mechanism (2) is an electromagnetic drive unit (21), which is fixed on the base (3). The electromagnetic drive unit (21) locks the first positioning unit (11) in the initial position or releases it from the initial position. When the electromagnetic drive unit (21) locks the first positioning unit (11) in the initial position, the locking part (111) is engaged in the groove (1221). When the electromagnetic drive unit (21) releases the first positioning unit (11) from the initial position, the locking part (111) disengages from the groove (1221).

2. A door closer linkage positioning and release device according to claim 1, characterised in that: The second positioning unit (122) includes a base plate (1222), a door opening detection plate (1223), and a nut (1224). The base plate (1222) and the door opening detection plate (1223) are fixedly connected. The groove (1221) is formed on the base plate (1222), or the groove (1221) is formed on the assembly composed of the base plate (1222) and the door opening detection plate (1223). The door opening detection plate (1223) is located on the base plate (1222) away from the rotating shaft (121). On one side of the root, the nut (1224) is located on the side of the door opening detection plate (1223) away from the bottom plate (1222). The nut (1224) is threadedly connected to the limiting rod (123). The bottom plate (1222) is provided with a first meshing structure on the side near the root of the rotating shaft (121). The root of the rotating shaft (121) is provided with a second meshing structure that cooperates with the first meshing structure. The first meshing structure has at least two teeth, and the second meshing structure has at least two teeth that cooperate with the first meshing structure.

3. The positioning and release device for a door closer linkage according to claim 1, characterized in that: The second positioning unit (122) includes a base plate (1222), a door opening detection plate (1223), and a nut (1224). The base plate (1222) and the door opening detection plate (1223) are fixedly connected. The groove (1221) is formed on the base plate (1222), or the groove (1221) is formed on the assembly composed of the base plate (1222) and the door opening detection plate (1223). The door opening detection plate (1223) is located on the side of the base plate (1222) away from the root of the rotating shaft (121). The nut (1224) Located on the side of the door opening detection plate (1223) away from the base plate (1222), the outer peripheral wall of the shaft (121) away from the root of the shaft (121) is provided with threads, the nut (1224) is threadedly connected to the shaft (121), the base plate (1222) is provided with a first meshing structure on the side near the root of the shaft (121), and the root of the shaft (121) is provided with a second meshing structure that cooperates with the first meshing structure. The first meshing structure has at least two teeth, and the second meshing structure has at least two teeth that cooperate with the first meshing structure.

4. A positioning and release device for a door closer linkage according to claim 2 or 3, characterized in that: The base plate (1222), the door opening detection plate (1223), and the nut (1224) are integrally formed, or any two of the base plate (1222), the door opening detection plate (1223), and the nut (1224) are integrally formed.

5. A positioning and release device for a door closer linkage according to claim 2 or 3, characterized in that: The first meshing structure has 360 first teeth, and the second meshing structure has 360 second teeth that cooperate with the first teeth.

6. The positioning and release device for a door closer linkage according to claim 1, characterized in that: The locking part (111) is a sphere (1111). The first positioning unit (11) also includes a first control rod (112), a first spring (113), a second spring (114), and a ball cup (115). The first control rod (112) has an annular boss (1121) in the middle. One end of the first spring (113) is sleeved on the outer peripheral wall of the first control rod (112), and the other end of the first spring (113) is sleeved on the outer peripheral wall of the ball cup (115). The second spring (114) and the sphere (115) are... 111) is installed sequentially inside the ball cup (115). The ball cup (115) is provided with a first annular limiting piece (1151) at the end away from the first control rod (112). The ball cup (115) is fixedly connected to the first control rod (112). Under the elastic force of the second spring (114), a part of the ball (1111) is exposed outside the ball cup (115). The ball (1111) cannot be completely removed from the ball cup (115) under the restriction of the first annular limiting piece (1151).

7. The positioning and release device for a door closer linkage according to claim 1, characterized in that: The locking part (111) is a sphere (1111). The first positioning unit (11) also includes a second control rod (116), a fourth spring (117), a fifth spring (118), a top plate (119), and a second adjusting rod (120). The second control rod (116) is tubular and has an annular boss (1121) in the middle. The fourth spring (117) is sleeved on the outer peripheral wall of the second control rod (116) near the sphere (1111). The sphere (1111), the fifth spring (118), and the top plate (119) are sequentially installed inside the second control rod (116). The second control rod (116) is located at the end near the sphere (1111). A second annular limiting piece is provided. Under the elastic force of the fifth spring (118), a portion of the ball (1111) is exposed outside the second control rod (116). The ball (1111) cannot be completely removed from the second control rod (116) under the restriction of the second annular limiting piece. The second adjusting rod (120) is located on the side of the second control rod (116) away from the ball (1111) and is threadedly connected to the second control rod (116). When the second adjusting rod (120) rotates clockwise, the second adjusting rod (120) pushes the top plate (119) to move closer to the ball (1111) in the second control rod (116).

8. A positioning and release device for a door closer linkage according to claim 6 or 7, characterized in that: The base (3) is also fixedly provided with a fixed shaft (31). The electromagnetic drive unit (21) includes an electromagnet assembly (211), an electric control rod (212), a rocker (213), and a third spring (214). The electric control rod (212) has an abutment part (2121) at one end away from the electromagnet assembly (211). The third spring (214) is sleeved on the outer peripheral wall of the electric control rod (212), and one end of the third spring (214) is abutted against the abutment part (2121). The third spring (214) abuts against the electromagnet assembly (211) at one end (2121), and the other end of the rocker (213) abuts against the electromagnet assembly (211). The rocker (213) has a first end (2131) and a second end (2132). The first end (2131) is rotatably connected to the electric control rod (212). The fixed shaft (31) is located between the electric control rod (212) and the first mechanism (1). The middle part of the rocker (213) is rotatably connected to the fixed shaft (31). On the first positioning unit (11), the abutment (2121) is located at a set position A under the elastic force of the third spring (214), and the second end (2132) presses against the upper surface of the annular boss (1121) to lock the first positioning unit (11) in the initial position. When the electromagnetic drive unit (21) is energized, the electromagnetic drive unit (21) drives the electric control rod (212) to retract to the set position B in the direction close to the electromagnetic drive unit (21). The electric control rod (212) drives the first end (2131) to rotate counterclockwise along the fixed shaft (31) to the set position C. The second end (2132) leaves the upper surface of the annular boss (1121) and releases the first positioning unit (11) from the initial position. After the first positioning unit (11) is released from the initial position, the second end (2132) abuts against the side surface of the annular boss (1121).

9. The positioning and release device for a door closer linkage according to claim 8, characterized in that: The second mechanism (2) is also provided with a temperature control drive unit (22), which includes a temperature-sensing glass ball (221), a ball groove (222), and a torsion spring (223). The ball groove (222) is fixed on the upper cover (4), the temperature-sensing glass ball (221) is fixed in the ball groove (222), one end of the torsion spring (223) abuts against the upper cover (4), and the other end of the torsion spring (223) presses against the temperature-sensing glass ball (221). When the external temperature reaches a certain value, the temperature-sensing glass ball (221) bursts, and the torsion spring (223) 223) Pressing down one end of the temperature-sensing glass ball (221) and pressing it onto the first end (2131), the torque of the torsion spring (223) drives the first end (2131) to rotate counterclockwise along the fixed shaft (31) to the set position C, the second end (2132) leaves the upper surface of the annular boss (1121), and releases the first positioning unit (11) from the initial position. After the first positioning unit (11) is released from the initial position, the second end (2132) abuts against the side surface of the annular boss (1121).

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