CN218522506U - Automatic door closing device - Google Patents

Abstract

The utility model belongs to the technical field of door body installation accessory, especially, relate to an automatic door closer, including last hinge housing, lower hinge piece, connect the swing arm, the turning block, resetting means and buffer cylinder, be provided with the installation cavity in going up the hinge housing, the turning block, resetting means and buffer cylinder are all installed in the installation cavity, the turning block rotates and installs in the installation cavity, resetting means and buffer cylinder rotate respectively and install in the both sides of turning block, and resetting means's other end butt is on the inside wall of installation cavity, buffer cylinder's the other end rotates and installs in the installation cavity, upward be provided with on the hinge housing and keep away the dead hole, the one end of connecting the swing arm penetrates in keeping away the dead hole and between the turning block fixed connection, and connect the swing arm and hug closely hinge housing surface setting, the other end slidable mounting of connecting the swing arm is on lower hinge piece. Through foretell setting for realize through simple connection that the door is slowly closed when opening the return and close, prevent the tong.

Description

Automatic door closing device

Technical Field

The utility model belongs to the technical field of door body installation accessory, especially, relate to an automatic door closer.

Background

The hinge is a mechanical device used for connecting two solids and allowing relative rotation between the two solids. The hinge may be constructed of a movable component or may be constructed of a foldable material. The hinges are more arranged on the cabinet and are mainly divided into stainless steel hinges and iron hinges according to material classification; realize the installation cooperation between door and the doorframe to be connected through setting up the hinge, the pivoted is more silky, among the prior art, adopts setting up buffer above the hinge, and fixed mounting is in the door rotation department again, slows down the closed speed of door through buffer's buffer function, and has the buffering effect unsatisfactory when adopting the hinge among the prior art to cushion closing of door, leads to the technical problem of tong.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic door closing device aims at solving and has the unsatisfactory technical problem who leads to the tong of buffering effect after the hinge installation among the prior art.

In order to achieve the above object, the embodiment of the utility model provides a pair of automatic door closing device, including last hinge housing, lower hinge block, connection swing arm, turning block, resetting means and cushion cylinder, go up and be provided with the installation cavity in the hinge housing, the turning block resetting means with cushion cylinder all install in the installation cavity, the turning block rotate install in the installation cavity, resetting means with cushion cylinder rotate respectively install in the both sides of turning block, just resetting means's other end butt in on the inside wall of installation cavity, cushion cylinder's the other end rotate install in the installation cavity, upward be provided with on the hinge housing and keep away the dead hole, the one end of connecting the swing arm penetrates in keeping away the dead hole with fixed connection between the turning block, just connect the swing arm and hug closely go up the housing external surface setting, the other end slidable mounting of connecting the swing arm in on the hinge block down.

Preferably, connect the swing arm including rotatory piece, pendulum rod and mounting panel, mounting panel fixed mounting in on the turning block, just be provided with the perpendicular to on the mounting panel the connecting plate of mounting panel, the connecting plate passes the clearance hole with the one end fixed connection of pendulum rod, the pendulum rod is hugged closely go up the surface of hinge housing, rotatory piece rotate install in the other end of pendulum rod, just rotatory piece slidable mounting in on the lower hinge piece.

Preferably, the swing rod is arranged in a bent mode, and one end, provided with the rotating block, of the swing rod is tightly attached to one side edge of the upper hinge shell.

Preferably, the resetting means includes sleeve, guide block and reset spring, the guide block rotate install in on the inside wall of installation cavity, just be provided with the guide bar on the guide block, telescopic one end rotate install in on the turning block, the guiding hole has been seted up to the telescopic other end, the guide bar install in the guiding hole, reset spring cover is located the sleeve with on the guide bar, just reset spring's both ends respectively the butt in the sleeve with on the guide block.

Preferably, the sleeve is including rotating connecting block, connecting cap and guide cylinder, rotate the connecting block with rotate between the rotating block and be connected, the both ends of connecting cap respectively with the institute rotate fixed connection between connecting block and the guide cylinder, just the diameter of connecting the cap is greater than the diameter of guide cylinder, the guide bar is located in the guide cylinder, reset spring cover is located on the guide cylinder, just reset spring's one end with connect mutual butt between the cap.

Preferably, a limiting block is arranged in the installation cavity and sleeved on the guide block.

Preferably, go up the hinge casing and include bottom plate and protection casing, the both sides face of turning block respectively with the bottom plate with rotate between the protection casing medial surface and be connected, buffer cylinder's tip with the bottom plate with rotate between the protection casing and be connected, just keep away the vacancy point and be located on the bottom plate, connect the swing arm with hug closely the setting between the lateral surface of bottom plate.

Preferably, the bottom plate is provided with an installation frame with an upward opening and a U-shaped cross section, the installation frame is fixedly installed on the bottom plate and located at one end of the bottom plate, when the connecting end on one side of the rotating block penetrates through the installation frame, the installation frame is rotatably connected with the bottom plate, one end of the reset device abuts against the installation frame, and the protective cover is locally located in the installation frame.

Preferably, two buckles are respectively arranged at two ends of the top of the bottom plate, and the two buckles are respectively clamped with two side faces of the protective cover.

Preferably, a sliding groove is formed in the lower hinge block, the sliding groove extends from one side edge of the lower hinge block to the other side edge of the lower hinge block, and the other end of the connecting swing arm is slidably mounted in the sliding groove.

The embodiment of the utility model provides an among the automatic door closer device above-mentioned one or more technical scheme have one of following technological effect at least:

the automatic door closing device in the utility model is formed by assembling an upper hinge shell, a lower hinge block, a connecting swing arm, a turning block, a resetting device and a buffer oil cylinder, wherein an installation cavity is arranged in the upper hinge shell and is used for installing the turning block, the resetting device and the buffer oil cylinder, the upper hinge shell is convenient to be fixedly installed at the top position of a door frame, so that the turning block, the resetting device and the buffer oil cylinder can be completely hidden, wherein, the turning block is rotatably installed in the installation cavity, the turning block is positioned at the middle position of the installation cavity, the resetting device and the buffer oil cylinder are respectively positioned at the two sides of the turning block, the resetting device and the buffer oil cylinder are both rotatably connected with the turning block, the other end of the resetting device is abutted against the side surface of the installation cavity, the other end of the buffer oil cylinder is rotatably connected with the installation cavity, and the two ends of the buffer oil cylinder are both rotatably connected, when the buffer oil cylinder extends or contracts, the angle is changed along with the rotation of the rotating block, an elastic pressing sheet is arranged on the inner side wall of the installation cavity, a limit notch is arranged on the rotating block, when the rotating angle of the rotating block exceeds a safety value, the elastic pressing sheet is abutted against the limit notch to limit the rotating block to rotate, a clearance hole is formed in the upper hinge shell at the installation position of the rotating block, one end of the connecting swing arm penetrates through the clearance hole to be fixedly connected with the rotating block, the connecting swing arm is informed to be tightly attached to the outer side surface of the upper hinge shell to ensure the flatness of the outer side surface of the upper hinge shell, the other end of the connecting swing arm is slidably installed on the lower hinge block, the lower hinge block is fixedly installed at the top of the door, the lower hinge block is driven to rotate by the rotation of the door, so that the end part of the connecting swing arm is driven to slidably rotate on the lower hinge block, the rotation of connecting the swing arm drives the turning block and rotates, the rotation of turning block drives the resetting means function on the one hand, the turning block does the reply and rotates under resetting means's effect after loosening the door, drive the door and close, and the speed that the buffering hydro-cylinder placed the door and kick-backed is too fast, realize the function of the closed weight of buffering door, finally reach the effect sealed with the silence, through foretell setting, make to realize the door slowly closed when opening the return and close through simple connection, prevent the tong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is an effect diagram of an automatic door closer according to an embodiment of the present invention.

Fig. 2 is an exploded view of an automatic door closing device according to an embodiment of the present invention.

Fig. 3 is an exploded view of an automatic door closing device (with a hinge housing removed) according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

10-upper hinge shell 11-bottom plate 12-protective cover

20-lower hinge block 21-chute 30-connecting swing arm

31-rotating block 32-swing rod 33-mounting plate

40-rotating block 50-resetting device 51-sleeve

52-guide block 53-return spring 60-buffer oil cylinder

111-mounting frame 112-limiting block 113-fastener

114-clearance hole 331-connecting plate 511-rotary connecting block

512-connecting cap 513-guiding cylinder.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in fig. 1-3, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the embodiments of the present invention, and should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In an embodiment of the present invention, as shown in fig. 1 to 3, there is provided an automatic door closing device, comprising an upper hinge housing 10, a lower hinge block 20, a connecting swing arm 30, a rotating block 40, a reset device 50 and a buffer cylinder 60, wherein the upper hinge housing 10 is installed at a door frame position and is buried in the door frame, the bottom is flush with the door frame surface, the lower hinge block 20 is fixedly installed at the top of the door, and it is ensured that the top of the lower hinge block 20 is flush with the top of the door, when the door is closed, the upper hinge housing 10 and the lower hinge block 20 are mutually matched to avoid collision between the two due to the protruded installation, an installation cavity is provided in the upper hinge housing 10, the rotating block 40, the reset device 50 and the buffer cylinder 60 are all installed in the installation cavity, the rotating block 40, the reset device 50 and the buffer cylinder 60 are installed in the installation cavity inside the upper hinge housing 10, the rotating block 40, the reset device 50 and the buffer cylinder 60 are hidden, on the one hand, the protection effect of the rotating block 40, the reset device 50 and the buffer cylinder 60 are installed in the installation cavity, on the other hand, the swing arm 40 is installed in the installation cavity, the swing arm 30, the buffer cylinder 60, the swing arm is connected to the installation cavity, the connecting hole 114, the other end of the rotating block is connected to the rotating block 114, the rotating block 30 and the buffer cylinder 114, the connecting hole 114, the rotating block 40, the buffer cylinder 60, the rotating block is connected to the installation cavity, the installation hole 114, the swing arm 30, the other end of the connecting swing arm 30 is slidably mounted on the lower hinge block 20, and the connecting swing arm 30 is tightly attached to the surface of the upper hinge housing 10, so that the connecting swing arm 30 can be prevented from occupying a large space due to rotation and affecting mounting.

The automatic door closing device in the utility model is assembled by an upper hinge shell 10, a lower hinge block 20, a connecting swing arm 30, a turning block 40, a resetting device 50 and a buffer oil cylinder 60, wherein an installation cavity is arranged in the upper hinge shell 10 for installing the turning block 40, the resetting device 50 and the buffer oil cylinder 60, so that the upper hinge shell 10 is conveniently and fixedly installed at the top position of a door frame, the turning block 40, the resetting device 50 and the buffer oil cylinder 60 can be completely hidden, wherein, the turning block 40 is rotatably installed in the installation cavity, the turning block 40 is positioned at the middle position of the installation cavity, the resetting device 50 and the buffer oil cylinder 60 are respectively positioned at the two sides of the turning block 40, the resetting device 50 and the buffer oil cylinder 60 are both rotatably connected with the turning block 40, the other end of the resetting device 50 is abutted against the side surface of the installation cavity, the other end of the buffer oil cylinder 60 is rotatably connected with the installation cavity, the two ends of the buffer oil cylinder 60 are rotatably connected, when the buffer oil cylinder 60 extends or contracts, the angle changes along with the rotation of the rotating block 40, an elastic pressing sheet is arranged on the inner side wall of the installation cavity, a limit notch is arranged on the rotating block 40, when the rotation angle of the rotating block 40 exceeds a safety value, the elastic pressing sheet is abutted against the limit notch to limit the rotation of the rotating block 40, a clearance hole 114 is arranged on the upper hinge shell 10 at the installation position of the rotating block 40, one end of the connecting swing arm 30 penetrates through the clearance hole 114 to be fixedly connected with the rotating block 40, the connecting swing arm 30 is informed to be tightly attached to the outer side surface of the upper hinge shell 10 to ensure the flatness of the outer side surface of the upper hinge shell 10, the other end of the connecting swing arm 30 is slidably installed on the lower hinge block 20, and the lower hinge block 20 is fixedly installed on the top of the door, hinge block 20 rotates under the rotation drive of passing through the door, thereby the tip that the swing arm 30 is connected in the drive slides above that and rotates, the rotation of connecting swing arm 30 drives turning block 40 and rotates, turning block 40's rotation drives resetting means 50 function on the one hand, turning block 40 does the answer rotation under resetting means 50's effect after loosening the door, it closes to drive the door, and buffer cylinder 60 places the speed that the door kick-backed at the excessive speed, realize the function of the closed weight of buffer door, finally reach the effect of sealed and silence, through foretell setting, make and realize the door slowly closed when opening the return and close through simple connection, prevent the tong.

In another embodiment of the present invention, as shown in fig. 1 to 3, the connection swing arm 30 includes a rotation block 31, a swing rod 32 and a mounting plate 33, a plurality of connection holes are provided on the rotation block 31 for avoiding the installation position of the rotation block 40, so as to facilitate the installation of the rotation block 40, the swing rod 32 is disposed in a flat shape, and is tightly attached to the surface of the upper hinge housing 10, the mounting block is in a circular truncated cone shape, and the circular truncated cone side of the circular truncated cone-shaped mounting block is disposed in a middle of the circular truncated cone side and is recessed inward for the joint to slide on the lower hinge block 20, the mounting plate 33 is fixedly mounted on the rotation block 40, and is provided with a connecting plate 331 perpendicular to the mounting plate 33 on the mounting plate 33, the connecting plate 331 passes through the clearance hole 114 and the one end fixed connection of the swing rod 32, so as to avoid the thickness of the clearance hole 114 through the connecting plate 331, the swing rod 32 is tightly attached to the outer surface of the upper hinge housing 10, the rotation block 31 is rotatably mounted on the lower hinge block 20, the mounting plate 33 is fixedly mounted on the lower hinge block 40 to rotate, and the swing rod 32 to drive the rotation block 32, and the rotation block 32 to move the upper hinge block 20 to move the lower hinge block 20 to move away from the lower hinge housing, and move the hinge block 20.

In another embodiment of the present invention, as shown in fig. 1 to 3, the swing rod 32 is disposed in a curved manner, and the one end of the swing rod 32 where the rotating block 31 is installed is tightly attached to one side edge of the upper hinge housing 10, so as to ensure that the lower hinge block 20 can tightly attach to the upper hinge housing 10 in an original state, and avoid a large gap left after the door is assembled due to an excessively large gap.

In another embodiment of the present invention, as shown in fig. 1 to 3, the reset device 50 includes a sleeve 51, a guide block 52 and a reset spring 53, the sleeve 51 is cylindrical, the reset spring 53 is sleeved on the sleeve 51, the guide block 52 is rotatably installed on the inner side wall of the installation cavity, and a guide rod is provided on the guide block 52, one end of the sleeve 51 is rotatably installed on the rotating block 40, the other end of the sleeve 51 is provided with a guide hole, the guide rod is installed in the guide hole, the guide rod slides in the guide hole to realize the telescopic guidance of the whole reset device 50, the reset spring 53 is sleeved on the sleeve 51 and the guide rod, and two ends of the reset spring 53 respectively abut against the sleeve 51 and the guide block 52, two ends of the reset spring 53 abut against the sleeve 51 and the guide block 52, when the door is opened, the swing arm 30 is driven and connected to rotate, the direction of the guide block 52 of the extrusion sleeve 51 moves, the reset spring 53 is pushed to rebound by the reset spring 53, when the door needs to be reset, the swing arm 30 is connected to rotate, and the hinge block 20 is connected to the hinge block 20, and the hinge 20 is connected to change at the same time.

In another embodiment of the present invention, as shown in fig. 2 to 3, the sleeve 51 includes a rotating connection block 511, a connection cap 512 and a guiding cylinder 513, the rotating connection block 511 is connected to the rotating block 40 in a rotating manner, a plurality of hole sites avoiding the installation position of the rotating block 40 are provided on the rotating connection block 511, the installation of the rotating block 40 is not affected when the rotating connection block 511 is installed on the rotating block 40, the two ends of the connection cap 512 are respectively fixedly connected to the rotating connection block 511 and the guiding cylinder 513, the diameter of the connection cap 512 is greater than that of the guiding cylinder 513, the guiding rod is located in the guiding cylinder 513, the reset spring 53 is sleeved on the guiding cylinder 513, one end of the reset spring 53 is abutted to the connection cap 512, the limit clamping to the end of the reset spring 53 is realized by providing the connection cap 512 at the middle position of the sleeve 51, the reset spring 53 is prevented from being directly abutted to the connection position between the sleeve 51 and the rotating block 40, and the rotation of the sleeve 51 is affected.

In another embodiment of the present invention, as shown in fig. 2, a limiting block 112 is disposed in the installation cavity, the limiting block 112 is sleeved on the guide block 52, and a end portion of the return spring 53 and the guide block 52 is located in the limiting block 112, the position of the return spring 53 is further limited by the limiting block 112, and the position sliding of the return spring 53 abutting at one end of the guide block 52 in the using process is avoided.

In another embodiment of the present invention, as shown in fig. 1-2, the upper hinge housing 10 includes a bottom plate 11 and a protective cover 12, and the upper hinge housing 10 is divided into the bottom plate 11 and the protective cover 12, and when the installation is performed, only the rotating block 40, the buffer cylinder 60 and the reset device 50 need to be aligned on the bottom plate 11, and then the installation can be completed by aligning and assembling the protective cover 12, which is simple and convenient, the two side surfaces of the rotating block 40 respectively with the bottom plate 11 and the protective cover 12 are rotatably connected between the inner side surfaces, the end portion of the buffer cylinder 60 and the bottom plate 11 and the protective cover 12 are rotatably connected, and the clearance hole 114 is located on the bottom plate 11, the connecting swing arm 30 and the outer side surface of the bottom plate 11 are tightly attached to each other, the clearance hole 114 is disposed on the bottom plate 11, and the opening of the one end of the clearance hole 114 is located on the edge of the bottom plate 11, and when the installation of the connecting swing arm 30 is performed, the connecting swing arm 30 only needs to be inserted from the inclination, and then fixedly connected to the rotating block 40, and the rotating block 40 is rotatably connected to the opening of the bottom plate 11.

In another embodiment of the utility model, as shown in fig. 1-2, be provided with the transversal installing frame 111 who personally submits the U type of opening up on the bottom plate 11, guide block 52 rotates and installs in this U type installing frame 111, carries on spacingly through the installation of U type installing frame 111 to protection casing 12, prevents that the intermediate position is unlocked to appear rocking about rocking after the protection casing 12 is installed, installing frame 111 fixed mounting in on the bottom plate 11, and be located the one end of bottom plate 11, when the link of turning block 40 one side passes be installing frame 111 with rotate between the bottom plate 11 and be connected, resetting means 50's one end butt in installing frame 111, just protection casing 12 part is located in installing frame 111, turning block 40 passes and rotates between installing frame 111's bottom surface and the bottom plate 11 and is connected, because the interval sets up between turning block 40 and the installing frame 111 can not appear because the collision between the turning block 40 and the installing frame 111 during turning block 40 pivoted process, appears when rotating.

In another embodiment of the present invention, as shown in fig. 2, two buckles 113 are respectively disposed at two ends of the top of the bottom plate 11, and two buckles 113 respectively connect with two side surfaces of the protection cover 12, and when the protection cover 12 is assembled, the two buckles 113 are respectively connected with two side surfaces of the protection cover 12 by pressing the two ends, so that the installation is completed by a simple operation.

In the utility model discloses a in another embodiment, as shown in fig. 1-3, spout 21 has been seted up on the lower hinge block 20, spout 21 certainly a side of lower hinge block 20 extends the setting towards another side, the other end slidable mounting of connecting swing arm 30 in spout 21, spout 21 slope sets up, and this incline direction extends along the direction that people opened, and the rotation of swing arm 30 is connected in the cooperation, and the position that the spout 21 medial surface closes on the upper surface of lower hinge block 20 is provided with the spacing arch of round, and the one end joint of connecting swing arm 30 prevents the roll-off in this spacing bellying.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An automatic door closing device, its characterized in that: including last hinge housing, lower hinge piece, connection swing arm, turning block, resetting means and buffer cylinder, go up and be provided with the installation cavity in the hinge housing, the turning block resetting means with buffer cylinder all install in the installation cavity, the turning block rotate install in the installation cavity, resetting means with buffer cylinder rotate respectively install in the both sides of turning block, just resetting means's other end butt in on the inside wall of installation cavity, buffer cylinder's the other end rotate install in the installation cavity, upward be provided with on the hinge housing and keep away the vacancy hole, the one end of connecting the swing arm penetrates in keeping away the vacancy hole with fixed connection between the turning block, just it hugs closely to connect the swing arm go up hinge housing external surface setting, the other end sliding mounting of connecting the swing arm in on the hinge piece down.

2. The automatic door closing device according to claim 1, wherein: connect the swing arm including rotatory piece, pendulum rod and mounting panel, mounting panel fixed mounting in on the turning block, just be provided with the perpendicular to on the mounting panel the connecting plate of mounting panel, the connecting plate passes keep away the vacancy hole with the one end fixed connection of pendulum rod, the pendulum rod is hugged closely go up the surface of hinge housing, rotatory piece rotate install in the other end of pendulum rod, just rotatory piece slidable mounting in on the lower hinge piece.

3. The automatic door closer device of claim 2, wherein: the swing rod is arranged in a bent mode, and one end, provided with the rotating block, of the swing rod is tightly attached to one side edge of the upper hinge shell.

4. The automatic door closing device according to claim 1, wherein: the resetting device comprises a sleeve, a guide block and a resetting spring, wherein the guide block is rotatably installed on the inner side wall of the installation cavity, a guide rod is arranged on the guide block, one end of the sleeve is rotatably installed on the guide block, a guide hole is formed in the other end of the sleeve, the guide rod is installed in the guide hole, the resetting spring is sleeved on the sleeve and the guide rod, and two ends of the resetting spring are respectively abutted to the sleeve and the guide block.

5. The automatic door closer device of claim 4, wherein: the sleeve is including rotating connecting block, connecting cap and guide cylinder, rotate the connecting block with rotate between the rotating block and be connected, the both ends of connecting cap respectively with the institute rotate fixed connection between connecting block and the guide cylinder, just the diameter of connecting cap is greater than the diameter of guide cylinder, the guide bar is located in the guide cylinder, the reset spring cover is located on the guide cylinder, just reset spring's one end with connect mutual butt between the cap.

6. The automatic door closer device of claim 4, wherein: a limiting block is arranged in the installation cavity and sleeved on the guide block.

7. The automatic door closing device according to claim 1, wherein: go up the hinge casing and include bottom plate and protection casing, the both sides face of turning block respectively with the bottom plate with rotate between the protection casing medial surface and be connected, buffer cylinder's tip with the bottom plate with rotate between the protection casing and connect, just keep away the dead hole and be located on the bottom plate, connect the swing arm with hug closely the setting between the lateral surface of bottom plate.

8. The automatic door closing device of claim 7, wherein: the protective cover is characterized in that an installing frame with an upward opening and a U-shaped cross section is arranged on the bottom plate, the installing frame is fixedly installed on the bottom plate and located at one end of the bottom plate, when the connecting end on one side of the rotating block penetrates through, the installing frame is connected with the bottom plate in a rotating mode, one end of the reset device is abutted to the installing frame, and the protective cover is locally located in the installing frame.

9. The automatic door closer device of claim 7, wherein: two buckles are respectively arranged at two ends of the top of the bottom plate, and the two buckles are respectively clamped between two side faces of the protective cover.

10. The automatic door closing device according to claim 1, wherein: the lower hinge block is provided with a sliding groove, the sliding groove extends from one side edge of the lower hinge block to the other side edge of the lower hinge block, and the other end of the connecting swing arm is slidably mounted in the sliding groove.

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