Automatic door closing hinge

Abstract

The utility model discloses an automatic door closing hinge which comprises a fixed hinge, a rotating hinge, a fixed connecting cylinder fixedly connected to the fixed hinge and a rotating connecting cylinder fixedly connected to the rotating hinge, and is characterized in that a pin sleeve is arranged in the rotating connecting cylinder, and a hydraulic shaft core sequentially penetrating through the fixed connecting cylinder and the pin sleeve is arranged in the rotating connecting cylinder; an inner cavity of the hydraulic shaft core is filled with hydraulic oil, a hydraulic piston is arranged in the inner cavity of the hydraulic shaft core in a sliding mode, a linkage structure for driving the hydraulic piston to reciprocate is arranged, and when the rotating hinge is rotated, the linkage structure can drive the hydraulic piston to reciprocate. And the service life of the automatic door closing hinge is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of door and window hardware accessories, in particular to an automatic door closing hinge. Background Art

[0002] Automatic door closing hinge is a new type of multifunctional hinge that relies on its own weight to automatically close the door. At present, the automatic door closing hinge is mainly composed of a fixed hinge, a rotating hinge and a cross pin. The upper edge of the cylindrical sleeve on one of the hinge pieces is provided with a conical spiral curved groove with an upward trajectory along the reverse direction of the circumference. When the other hinge piece opens by making a circular motion around the cross pin, it will rise along the curved groove. If it does not rotate to 90 degrees, the door's own gravity will restore the door to its initial position and close automatically. During the closing process, the cross pin descends along the curved groove. Now, in order to slow down the speed of fast door closing, a hydraulic piston is also provided.

[0003] Chinese patent application number 202210200497.6 discloses a hydraulic door hinge, which includes a leaf, a sleeve, a pin, a piston rod, a cylindrical cam curve groove and an oblong hole. The pin passes through the piston rod through hole, the cylindrical cam curve groove and the oblong hole. The leaf drives the sleeve to rotate, and the rotating sleeve passes through the oblong hole and is connected to the pin passing through the cam curve groove. The pin passes through the piston rod at the same time, thereby converting the door leaf rotation into the axial movement of the piston rod.

[0004] The oblong hole serves as the contact point for the rotation of the driving axle pin. If the axle pin is subjected to uneven force or excessive force during use, it will easily lead to local stress concentration, which in turn causes deformation. It will easily cause the axle pin to be stuck in the oblong hole, making it difficult to remove the axle pin, resulting in the inability to raise or lower the hinge as a whole, making the hinge invalid and requiring the entire hinge to be replaced. In view of the above problems, an automatic door closing hinge is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an automatic door closing hinge, which can take out an axle pin, facilitates the replacement and disassembly of the axle pin, and prolongs the service life of the automatic door closing hinge.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: an automatic door closing hinge, including a fixed page, a rotating page, a fixed connecting cylinder fixed to the fixed page and a rotating connecting cylinder fixed to the rotating page, characterized in that: a pin sleeve is provided in the rotating connecting cylinder, and a hydraulic shaft core is provided which passes through the fixed connecting cylinder and the pin sleeve in sequence, the inner cavity of the hydraulic shaft core is filled with hydraulic oil and a hydraulic piston is slidably provided in the inner cavity of the hydraulic shaft core, and a linkage structure for driving the hydraulic piston to reciprocate is provided, and when the rotating page is rotated, the linkage structure can drive the hydraulic piston to reciprocate.

[0007] By adopting the above technical solution, the linkage structure can drive the hydraulic piston to reciprocate, and the resistance of the hydraulic piston in the inner cavity of the hydraulic shaft core plays a role in slowly closing the door.

[0008] It is further configured as follows: the hydraulic shaft core includes an upper pin barrel, a lower connecting barrel threadedly connected to the upper pin barrel, an upper end cap threadedly connected to one end of the upper pin barrel facing the lower connecting barrel, and a lower end cap threadedly connected to one end of the lower connecting barrel facing the upper pin barrel.

[0009] By adopting the above technical solution, the upper pin cylinder is threadedly connected to the lower connecting cylinder, the upper pin cylinder is threadedly connected to the upper end cover, and the lower connecting cylinder is threadedly connected to the lower end cover, and they are threadedly connected to each other, and the assembly is simple.

[0010] It is further configured as follows: the linkage structure includes a spiral curve groove with an upward trajectory at one end of the upper pin cylinder facing the lower connecting cylinder, two linkage grooves are provided in the inner cavity at one end of the pin sleeve along the symmetrical direction of the length axis, and a through hole is vertically provided along the length direction at one end of the hydraulic piston facing the lower connecting tube, and a cross pin passes through the through hole and the spiral curve groove, the two ends of the cross pin respectively extend into the corresponding linkage grooves to form an axial sliding fit, and the hydraulic shaft core is rotatably arranged in the pin sleeve.

[0011] By adopting the above technical scheme, when the fixed page and the rotating page are in the opening process, the rotating page is rotated to make a circular motion around the hydraulic shaft core, and the rotating page will drive the connecting sleeve to rotate at the same time. The initial state of the cross pin is located at the bottom of the linkage groove. The linkage groove will drive the cross pin to rise with the rotation of the spiral curve groove, and the hydraulic piston on the cross pin will also rise; when the fixed page and the rotating page are in the closing process, the cross pin spirally descends from the top of the spiral curve groove due to its own gravity. At the same time, the spiral rotation of the cross pin closes the rotating page, so that the rotating page can be automatically closed, and the hydraulic piston descends accordingly. The hydraulic piston acts as a resistance, which slows down the closing speed; through the setting of the linkage groove, the shaft pin is easy to be taken out from the linkage groove, which is convenient for the replacement and disassembly of the shaft pin, thereby increasing the service life of the automatic door closing hinge.

[0012] It is further configured as follows: a plurality of first interference teeth are circumferentially arranged along the length direction at one end of the pin sleeve away from the linkage groove, and the first interference teeth are inserted into the rotating connection cylinder.

[0013] By adopting the above technical solution, the first interference tooth is inserted into the inner cavity of the rotating connecting cylinder, which is convenient for assembly, so that the pin sleeve is fixedly connected to the rotating connecting cylinder.

[0014] It is further configured as follows: a plurality of second interference teeth are provided in the circumferential direction along the length direction at one end of the upper pin cylinder away from the spiral curve groove, and the second interference teeth are inserted in the fixed connection cylinder.

[0015] By adopting the above technical solution, the second interference fit tooth is inserted into the inner cavity of the fixed connection tube to fix it, and the upper pin tube can be easily removed from the fixed connection tube.

[0016] It is further configured as follows: a through groove is opened on the inner wall of the fixed connection cylinder along the length direction, and when the linkage groove and the through groove are exactly corresponding to each other, the cross pin is allowed to slide into the linkage groove.

[0017] By adopting the above technical solution, during the process of rotating the rotating page, the through groove and the linkage groove are connected, which facilitates sliding the cross pin from the outside into the linkage groove, and the assembly process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the explosion structure of this embodiment;

[0019] Figure 2 This is a schematic diagram of the hinge opening state of the embodiment;

[0020] Figure 3 This is a schematic diagram of the hinge closed state of the embodiment;

[0021] In the figure: 1, fixed page; 2, rotating page; 11, fixed connecting cylinder; 21, rotating connecting cylinder; 22, pin sleeve; 221, linkage groove; 222, first interference tooth; 3, hydraulic shaft core; 4, hydraulic piston; 31, upper pin cylinder; 32, lower connecting cylinder; 311, upper end cover; 321, lower end cover; 312, spiral curve groove; 313, second interference tooth; 41, perforation; 5, cross pin; 111, through groove. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] refer to Figures 1 to 3 An automatic door closing hinge includes a fixed leaf 1, a rotating leaf 2, a fixed connecting cylinder 11 welded to the fixed leaf 1, and a rotating connecting cylinder 21 welded to the rotating leaf 2. A pin sleeve 22 is sleeved in the rotating connecting cylinder 21, and a hydraulic shaft core 3 is provided which passes through the fixed connecting cylinder 11 and the pin sleeve 22 in sequence. The inner cavity of the hydraulic shaft core 3 is filled with hydraulic oil, and a hydraulic piston 4 is slidably provided in the inner cavity of the hydraulic shaft core 3. A linkage structure is provided for driving the hydraulic piston 4 to reciprocate in the inner cavity of the hydraulic shaft core 3. When the rotating leaf 2 is rotated, the linkage structure can drive the hydraulic piston 4 to reciprocate. The hydraulic shaft core 3 includes an upper pin cylinder 31, a lower connecting cylinder 32 threadedly connected to the upper pin cylinder 31, an upper end cap 311 threadedly connected to one end of the upper pin cylinder 31 facing away from the lower connecting cylinder 32, and a lower end cap 321 threadedly connected to one end of the lower connecting cylinder 32 facing away from the upper pin cylinder 31.

[0024] The linkage structure includes a spiral curve groove 312 with an upward trajectory at one end of the upper pin tube 31 facing the lower connecting tube 32, two linkage grooves 221 are formed in the inner cavity of one end of the pin sleeve 22 along the longitudinal axis symmetrical direction, a through hole 41 is vertically formed along the longitudinal direction at one end of the hydraulic piston 4 facing the lower connecting tube, and a transverse pin 5 passes through the through hole 41 and the spiral curve groove 312, and the two ends of the transverse pin 5 extend into the corresponding linkage groove 221 to form an axial sliding fit, and the hydraulic shaft core 3 is rotatably arranged in the pin sleeve 22. A plurality of first interference teeth 222 are circumferentially arranged along the longitudinal direction at one end of the pin sleeve 22 away from the linkage groove 221, and the first interference teeth 222 are inserted into the rotating connecting tube 21. A plurality of second interference teeth 313 are circumferentially arranged along the longitudinal direction at one end of the connecting tube away from the spiral curve groove 312, and the second interference teeth 313 are inserted into the fixed connecting tube 11 to fix the two. A through slot is formed on the inner wall of the fixed connection cylinder 11 along the length direction. When the hinge is in the open state or the closed state, the linkage slot 221 corresponds to the through slot and the transverse pin 5 slides into the linkage slot 221 .

[0025] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An automatic door closing hinge, comprising a fixed leaf (1), a rotating leaf (2), a fixed connecting cylinder (11) fixed to the fixed leaf (1), and a rotating connecting cylinder (21) fixed to the rotating leaf (2), characterized in that: The rotating connecting cylinder (21) is provided with a pin sleeve (22), and is provided with a hydraulic shaft core (3) which passes through the fixed connecting cylinder (11) and the pin sleeve (22) in sequence. The inner cavity of the hydraulic shaft core (3) is filled with hydraulic oil, and a hydraulic piston (4) is slidably provided in the inner cavity of the hydraulic shaft core (3). A linkage structure for driving the hydraulic piston (4) to reciprocate is provided, and when the rotating leaf (2) is rotated, the linkage structure can drive the hydraulic piston (4) to reciprocate.

2. The automatic door closing hinge according to claim 1, characterized in that: The hydraulic shaft core (3) comprises an upper pin barrel (31), a lower connecting barrel (32) threadedly connected to the upper pin barrel (31), an end of the upper pin barrel (31) facing away from the lower connecting barrel (32) threadedly connected to an upper end cover (311), and an end of the lower connecting barrel (32) facing away from the upper pin barrel (31) threadedly connected to a lower end cover (321).

3. The automatic door closing hinge according to claim 2, characterized in that: The linkage structure comprises a spiral curved groove (312) with an upward trajectory formed at one end of the upper pin cylinder (31) facing the lower connecting cylinder (32), two linkage grooves (221) formed in the inner cavity of one end of the pin sleeve (22) along the longitudinal axis symmetrical direction, a through hole (41) formed vertically along the longitudinal direction at one end of the hydraulic piston (4) facing the lower connecting tube, and a transverse pin (5) passing through the through hole (41) and the spiral curved groove (312), wherein the two ends of the transverse pin (5) respectively extend into the corresponding linkage grooves (221) to form an axial sliding fit, and the hydraulic shaft core (3) is rotatably arranged in the pin sleeve (22).

4. The automatic door closing hinge according to claim 1, characterized in that: A plurality of first interference teeth (222) are circumferentially arranged along the length direction at one end of the pin sleeve (22) away from the linkage groove (221), and the first interference teeth (222) are inserted into the rotating connection cylinder (21).

5. The automatic door closing hinge according to claim 2, characterized in that: A plurality of second interference teeth (313) are circumferentially arranged along the length direction at one end of the upper pin tube (31) away from the spiral curved groove (312), and the second interference teeth (313) are inserted into the fixed connection tube (11).

6. The automatic door closing hinge according to claim 1, characterized in that: The inner wall of the fixed connection tube (11) is provided with a through groove (111) along the length direction, and when the linkage groove (221) corresponds to the through groove (111), the cross pin (5) slides into the linkage groove (221).

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