CN214463424U - Hinge assembly and corresponding opening and closing device - Google Patents

Abstract

The utility model discloses a hinge subassembly and corresponding device that opens and shuts, this hinge subassembly are used for connecting first object and second object, include: the first connecting piece is fixedly connected to a first object and provided with a first tooth part with a downward tooth surface; the second connecting piece is fixedly connected to the second object, is hinged with the first connecting piece, and is provided with a second tooth part with the tooth surface facing the first tooth part; the second tooth part is configured and adapted to be matched with the first tooth part so as to push the first connecting piece to move relative to the second connecting piece along the hinging axial direction of the first connecting piece and the second connecting piece through the inclined surface matching when the first connecting piece rotates relative to the second connecting piece. The opening and closing device adopts the hinge assembly, the movable door leaf can rotate and simultaneously lift up and down, and the abrasion of the lower edge of the movable door leaf is avoided.

Description

Hinge assembly and corresponding opening and closing device

Technical Field

The utility model relates to a hinge technical field, concretely relates to hinge subassembly and corresponding device that opens and shuts.

Background

The existing open-close device of the shower room generally adopts a vertical hinged door or a sliding door, and generally has a metal frame in the structure adopting the vertical hinged door, a fixed door leaf is arranged in the metal frame, and a movable door leaf is hinged on the fixed door leaf through a hinge, the movable door leaf can rotate the opening and closing operation of the shower room relative to the fixed door leaf, but the lower edge of the movable door leaf of the vertical hinged door is generally lower in order to improve the sealing effect, so that the abrasion of the movable door leaf is easily caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned defect or problem that exist among the background art, provide a hinge subassembly and corresponding device that opens and shuts, this hinge subassembly has been adopted to the device that should open and shut to make its activity door leaf can realize the oscilaltion in the pivoted, avoid the lower edge wearing and tearing of activity door leaf.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a hinge assembly for connecting a first object and a second object, comprising: the first connecting piece is fixedly connected to a first object and provided with a first tooth part with a downward tooth surface; the second connecting piece is fixedly connected to a second object, is hinged with the first connecting piece, and is provided with a second tooth part with the tooth surface facing the first tooth part; the second tooth part is configured and adapted to be adapted with the first tooth part so as to push the first connecting piece to move relative to the second connecting piece along the hinging axial direction of the first connecting piece and the second connecting piece through the inclined surface matching when the first connecting piece rotates relative to the second connecting piece.

Furthermore, the device also comprises a resetting piece; the two ends of the reset piece act on the first connecting piece and the second connecting piece and are configured and suitable for applying force to the first connecting piece so that the first connecting piece can be kept in an engaged state with the lower tooth holder when the force is not applied.

Furthermore, the piece that resets is the elastic component that both ends acted on first connecting piece and second connecting piece respectively or installs two homopolar relative magnetism pieces on first connecting piece and second connecting piece respectively.

Further, the device also comprises a shell and a cover plate; the shell is hinged with the second connecting piece and limited by the second connecting piece in the upward direction of the hinged shaft, and is fixedly connected with the cover plate and matched with the cover plate to form an installation cavity; the first connecting piece is installed in the installation cavity.

Furthermore, the cover plate is provided with a sliding groove which extends along the hinge axis direction of the first connecting piece and the second connecting piece.

Further, the first connecting piece comprises a first connecting plate and an upper tooth holder; the upper tooth holder is in rotation stopping fit with the first connecting plate, and a first tooth part is arranged on the upper tooth holder; the second connecting piece comprises a second connecting plate and a lower tooth holder; the lower tooth holder is fixedly connected to the second connecting plate, and a second tooth part is arranged on the lower tooth holder; the first connecting plate is hinged with the second connecting plate.

Furthermore, the upper tooth holder and the lower tooth holder are made of plastic materials.

Further, the first tooth portion and the second tooth portion are planar at the top of the tooth and the bottom of the tooth slot.

Further, the device also comprises an articulated shaft lever; the second connecting piece also comprises a limiting plate; the hinge shaft rod penetrates through the first connecting piece and the second connecting piece; the limiting plates are fixedly connected to the second connecting plate and abut against two ends of the hinged shaft rod.

Furthermore, the utility model also provides a device opens and shuts, should open and shut the device and include activity door leaf and fixed door leaf, and the connection between activity door leaf and the fixed door leaf has adopted above-mentioned arbitrary hinge subassembly.

As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:

1. the connecting piece comprises two connecting pieces hinged to each other, a first tooth portion is arranged on the first connecting piece, a second tooth portion is arranged on the second connecting piece, the tooth surface of the first tooth portion faces downwards, the tooth surface of the second tooth portion faces upwards, when the two connecting pieces rotate relatively from the initial position, the first tooth portion can be disengaged from the second tooth portion, the first connecting piece can be pushed upwards under the effect of inclined surface matching, the position of the first object is raised, when the two connecting pieces rotate in a resetting mode, the first tooth portion can be meshed with the second tooth portion again, the first connecting piece descends, and the position of the first object can descend along with the first tooth portion.

2. The reset piece is arranged, and when the first tooth part on the first connecting piece is disengaged from the meshing of the second tooth part on the second connecting piece, the reset piece drives the first connecting piece to rotate relative to the second connecting piece, so that the first tooth part is meshed with the second tooth part again, and the reset of the first connecting piece is realized.

3. The piece that resets can be the elastic component, utilizes elasticity promotion first connecting piece downstream, or two magnetic component that like magnetic pole is relative, utilizes the magnetic force that repels to promote first connecting piece downstream, because the meshing cooperation relation of first tooth portion and second tooth portion, when first connecting piece downstream, under the inclined plane complex effect, first connecting piece also can rotate relative the second connecting piece to realize resetting of first connecting piece.

4. Set up shell and apron, first connecting piece can be according to in the cavity that shell and apron formed, under the covering of shell, the rising and the decline of first connecting piece can not observed from the outside to improved the integrative nature of the outward appearance of hinge subassembly in the use, improved the aesthetic measure of appearance, the setting of apron also makes first connecting piece can not follow the shell and drop simultaneously, makes shell, apron and first connecting piece can synchronous revolution.

5. The cover plate is provided with a chute, and the chute is used for moving the components of the connecting part of the first connecting piece and the first object because the first connecting piece needs to be fixedly connected with the first object and also because the first connecting piece needs to move up and down.

6. The first connecting piece comprises a first connecting plate and an upper tooth seat, the second connecting piece comprises a second connecting plate and a lower tooth seat, the upper tooth seat is in rotation stopping fit with the first connecting plate, the lower tooth seat is fixedly connected onto the second connecting plate, and the components can be installed more conveniently due to the separated design.

7. Go up the toothholder and be the plastic material with lower toothholder, because upper and lower toothholder need rotate in the dentate complex, have more contact part between the two, consequently adopt the plastic material preparation, can reduce the relative motion and to the wearing and tearing that the two caused, improve the life of upper and lower toothholder, also can provide better rotation and feel.

8. The top of the tooth of two tooth portions and the bottom of the tooth groove are both arranged to be planar, when the two tooth portions rotate relatively, the plane structures of the tooth tops and the groove bottoms of the two tooth portions can be mutually abutted, and therefore the first connecting piece is stably in a state of being disengaged from the second connecting piece.

9. Set up articulated axostylus axostyle and limiting plate, the rotation axle center that first connecting piece and second connecting piece can be regarded as to articulated axostylus axostyle, and the limiting plate rigid coupling is on second connecting piece board and butt to the both ends of articulated axostylus axostyle, can prevent that articulated axostylus axostyle from droing.

10. The hinge assembly can enable the movable door leaf and the fixed door leaf of the opening and closing device to rotate relatively and enable the movable door leaf to move upwards relative to the fixed door leaf on the hinged shaft, so that the lower edge of the movable door leaf is prevented from being abraded.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic partial structural view 1 of an embodiment of a hinge assembly provided by the present invention;

FIG. 2 is a schematic view of a portion of the hinge assembly of FIG. 1;

FIG. 3 is a schematic view of a portion of the hinge assembly of FIG. 1, assembled;

fig. 4 is a partial schematic structural view of an embodiment of a hinge assembly provided by the present invention, fig. 3;

FIG. 5 is a schematic view of a portion of the hinge assembly of FIG. 4, assembled;

fig. 6 is a schematic view illustrating a usage state of a hinge assembly provided by the present invention;

fig. 7 is a schematic structural diagram of an embodiment of an opening and closing device provided by the present invention.

Description of the main reference numerals:

10. a housing; 11. a tooth holder installation bin; 20. a first connecting plate; 21. a spring mounting bin; 22. a spring; 23. an upper tooth holder; 231. a first tooth portion; 24. a lower tooth holder; 241. a second tooth portion; 242. a first slot; 25. a base plate; 26. a cover plate; 30. a second connecting plate; 31. a fixed seat; 32. a yielding groove; 33. an anti-collision member; 34. an upper clamping piece; 341. a second slot; 35. a limiting plate; 40. an articulation shaft; 51. a movable door leaf; 52. fixing the door leaf; 53. a first mounting plate; 54. a second mounting plate.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence.

In the claims, the specification and the drawings, unless otherwise expressly limited, all directional or positional relationships, such as those using the terms "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," "counterclockwise," and the like, are based on the directional or positional relationships illustrated in the drawings and are for the purpose of convenience in describing the invention and simplifying the description, but do not indicate or imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the scope of the invention.

In the claims, the description and the drawings of the present application, unless otherwise expressly limited, the term "fixedly connected" or "fixedly connected" is used, which is to be understood broadly, that is, any connection mode without displacement relation or relative rotation relation between the two, that is, including non-detachably fixed connection, integrated connection and fixed connection through other devices or elements.

In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting.

Referring to fig. 1, fig. 1 shows a partial schematic structural view of an embodiment of a hinge assembly provided by the present invention, and in conjunction with fig. 4, the main structural components of the embodiment of the hinge assembly are shown, and the hinge assembly is used for realizing the connection of a first object and a second object, and mainly comprises a first connecting piece, a second connecting piece, a reset piece, a housing 10, a cover plate 26 and a hinge shaft lever 40.

The first link includes a first link plate 20 and an upper block 23.

The first connecting plate 20 has a structure as shown in fig. 1, in which a main body portion is a plate-shaped member, a cylindrical structure is provided at a right position of the plate-shaped member (where the position is based on the direction shown in fig. 1), a cavity is formed inside the cylindrical structure, an opening of the cavity faces upward, a bottom of the cavity is closed, a mounting post is provided inside the cavity, the inside of the mounting post penetrates up and down, so that a gap is formed between the mounting post and an inner wall of the cylindrical structure, and the gap forms a spring mounting chamber 21. A tooth structure for forming a rotation stop fit with the upper tooth holder 23 is arranged at the lower part of the cylindrical structure, the tooth structure comprises a protruding part and a recessed part, and vertical side walls are arranged at the protruding part and the recessed part. The upper side position of the main body part of the first connecting plate 20 is provided with a bolt connection column protruding outwards, the inner side wall surface of the bolt connection column is provided with threads, a sleeve connection hole is arranged below the bolt connection column, the sleeve connection hole can be used for installing a nut, and the bolt connection column and the nut are both used for being connected with a first object.

The upper tooth holder 23 is constructed as shown in fig. 1, and has, on its upper side, a tooth-like structure for engagement with the first connecting plate 20, which tooth-like structure is provided with projections and recesses adapted to the tooth-like structure of the cylindrical portion of the first connecting plate 20, and likewise, the projections and recesses are provided with vertical side walls, so that the upper tooth holder 23, when inserted into the first connecting plate 20, can be connected thereto in a rotationally fixed manner relative to the first connecting plate 20. On the underside of the upper tooth holder 23, a further tooth-like structure is provided, which forms a first tooth 231 facing downwards, wherein the tooth-facing downwards means that in the normal application of the hinge assembly, the first tooth 231 faces the ground in the vertical direction. The first tooth 231 is generally saw-toothed, and has side walls inclined, and top and bottom teeth. Meanwhile, a through hole penetrating in the vertical direction is formed in the center of the upper toothholder 23.

The second link member includes a second link plate 30, a lower toothholder 24, a collision preventing member 33, an upper clip member 34, and a stopper plate 35.

The main body of the second connecting plate 30 is a plate-shaped member, on which a screw post is provided for connecting with a second object, and a notch 32 is provided at the left side of the second connecting plate 30, and the notch 32 is a notch structure at the left side edge of the second connecting plate 30, and the notch structure is recessed toward the center of the second connecting plate 30. This groove 32 of stepping down can supply the cylindric part embedding of first connecting plate 20 right side position, is provided with a fixing base 31 respectively in this groove 32 of stepping down's upper and lower side, is provided with the through-hole that link up along vertical direction on the fixing base 31. A screw hole is provided near the fixing seat 31.

The lower tooth holder 24 is constructed as shown in fig. 1 and 2, and includes a holder body member as a main body, wherein a second tooth portion 241 is disposed on an upper surface of the holder body member, the second tooth portion 241 faces the first tooth portion 231, and the tooth structure thereof is matched with the tooth structure of the first tooth portion 231, and the second tooth portion 241 and the first tooth portion 231 can be engaged with each other, and since the side walls of the teeth of the two are inclined, when the upper tooth holder 23 rotates relative to the lower tooth holder 24, under the action of the inclined surface, the upper tooth holder 23 moves upward along the inclined side walls until the flat bottom sections on the tops of the teeth of the upper tooth holder 23 and the lower tooth holder 24 abut against each other, at this time, the upper tooth holder 23 and the lower tooth holder 24 are in a stable state, and then the upper tooth holder 23 is forced in the opposite direction, and the upper tooth holder 23 is engaged with the lower tooth holder 24 again. A first insertion groove 242 is formed in the holder body member portion of the lower tooth holder 24 to penetrate the lower tooth holder 24 in the front-rear direction shown in fig. 1, and the first insertion groove 242 is used for inserting the fixing holder 31 at the lower position on the second connecting plate 30. Meanwhile, a through hole penetrating in the vertical direction is formed at the center of the lower tooth holder 24, and the through hole passes through the second tooth 241 and the first slot 242 and then is exposed from the lower side of the lower tooth holder 24.

The structure of the bumper 33 is shown in fig. 1 and 2, which is an inverted plate-shaped member in an "L" shape, and taking the direction shown in fig. 1 as an example, two protruding ribs are provided on the upper surface of the short side, and a through hole penetrating along the vertical direction is provided, and a plurality of convex columns are provided on the right surface of the long side.

The upper clip part 34 is configured as shown in fig. 1 and fig. 2, and is a substantially L-shaped inverted block-shaped member, taking the direction shown in fig. 1 as an example, two concave grooves are provided on the lower side surface of the short side of the upper clip part, the two grooves are used for being matched with ribs on the bumper 33, a second slot 341 penetrating through the upper clip part 34 along the front-back direction shown in fig. 1 is provided in the thickness direction of the short side, the second slot 341 can be used for inserting the fixing seat 31 at the upper side position on the second connecting plate 30, and a through hole penetrating along the vertical direction is provided, the through hole penetrates through the second slot 341 and is exposed on both upper and lower side surfaces of the short side of the upper clip part 34; the left side surface on its long limit is equipped with a plurality of shrinkage pool, and this shrinkage pool can with the projection adaptation on the anticollision piece 33 to together fix anticollision piece 33 on last fastener 34 with the cooperation of foretell groove and rib, anticollision piece 33 can prevent that first connecting piece from causing the impact to the second connecting piece from the side in the motion process, guarantees hinge subassembly overall structure's stability.

The structure of the limit plate 35 is shown in fig. 1 and 4, the assembled effect is shown in fig. 5, it can be fastened on the second connecting plate 30 through the threaded hole near the fixed seat 31 on the second connecting plate 30, and the stepped structure provided thereon can seal the through hole port on the upper surface of the upper clip piece 34 and the through hole port on the lower surface of the lower tooth holder 24.

The hinge shaft 40 is inserted from the through hole on the upper side of the upper clip 34 during assembly, and is exposed from the through hole on the lower side of the lower toothholder 24 after passing through the anti-collision member 33, the first connecting plate 20, the upper toothholder 23 and the lower toothholder 24, and the limiting plate 35 can abut against the two ends of the hinge shaft 40 after being fixed on the second connecting plate 30, thereby preventing the hinge shaft 40 from falling off.

The housing 10 of the hinge assembly is constructed as shown in fig. 1, the housing 10 is a box-shaped member, the periphery of which is provided with a side wall, and a tooth holder installation chamber 11 is formed at the right side position, a through hole for the hinge shaft 40 to pass through is provided above the tooth holder installation chamber 11, and a through hole with a large size for the second tooth portion 241 of the lower tooth holder 24 to be inserted is provided below the tooth holder installation chamber. A plurality of screw posts are provided at the main body portion of the housing 10.

The cover plate 26 is constructed as shown in fig. 4, and its assembled effect is shown in fig. 5. the cover plate 26 is adapted to the housing 10 in size and shape and is tightly fitted to the screw-on posts of the housing 10 by bolts. A sliding groove is provided in the cover plate 26, and the extending direction of the sliding groove coincides with the extending direction of the hinge shaft 40, and a screw post and a nut provided in the first connection plate 20 can protrude from the sliding groove and be connected to the first object. After the cover plate 26 is fixedly connected with the housing 10, a mounting chamber is formed between the cover plate 26 and the housing 10, and the first connecting plate 20 and the second tooth portions 241 of the upper tooth holder 23 and the lower tooth holder 24 are located in the mounting chamber, which can prevent the above components from falling off and enables the housing 10, the cover plate 26 and the first connecting piece to rotate synchronously. In addition, a backing plate 25 is disposed between the cover plate 26 and the first connecting plate 20, and the backing plate 25 can prevent the first connecting plate 20 from directly contacting the cover plate 26 and prevent the first connecting plate 20 from loosening in the mounting cavity.

The length of the toothholder installation bin 11 on the right side of the shell 10 is consistent with the size of the abdicating groove 32 on the left side of the second connecting plate 30, the toothholder installation bin 11 can be just embedded into the abdicating groove 32, the upper surface and the lower surface of the toothholder installation bin 11 can be run through by the hinged shaft rod 40, the shell 10 can well coat the first connecting piece and the second tooth part 241, when the toothholder 24 rotates relatively under the upper toothholder 23, the meshing between the two and the separation can be sheltered from by the shell 10, the external observation cannot be carried out, and the appearance attractiveness is improved.

Meanwhile, the restoring member is also disposed between the block mounting chamber 11 and the first connection plate 20. In this embodiment, the restoring member is an elastic member, specifically, a spring 22, as shown in fig. 6, the spring 22 may be sleeved on the mounting post in the cavity of the cylindrical portion on the right side of the first connecting plate 20 and accommodated by the spring mounting bin 21, at this time, the lower end of the spring 22 will abut against the first connecting plate 20, and after the first connecting plate 20 is mounted on the housing 10, the upper end of the spring 22 will abut against the upper wall surface of the inner side of the gear seat mounting bin 11. When the upper block 23 is disengaged from the lower block 24, the first link plate 20 moves upward, causing the spring 22 to contract, and when the urging force is removed, the spring 22 causes the first link plate 20 to move downward, causing the upper block 23 to re-engage with the lower block 24.

Of course, in other embodiments, the reset member may also be a magnetic member, the magnetic member includes a first magnet and a second magnet, the first magnet and the second magnet are respectively installed on the tooth seat installation chamber 11 and the first connection plate 20, and one ends of the same magnetic poles of the first magnet and the second magnet are oppositely arranged, so that the first connection plate 20 can be pushed to reset under the repulsive force of the first magnet and the second magnet.

In addition, it should be noted that, in the present embodiment, the upper tooth holder 23 and the lower tooth holder 24 are made of plastic material, specifically, PM material, and since the upper tooth holder 23 and the lower tooth holder 24 need to perform relative movement frequently, the surfaces of the two in contact with each other will rub against each other, and the use of plastic material can effectively prolong the service life of the upper tooth holder 23 and the lower tooth holder 24.

The above-mentioned hinge assembly is changed in use state as shown in fig. 6, in the initial state, the spring 22 is expanded, the upper tooth holder 23 is kept engaged with the lower tooth holder 24, an outward pushing force is applied to the first connecting plate 20, the first connecting plate 20 starts to move outward, the upper tooth holder 23 is gradually disengaged from the lower tooth holder 24, the spring 22 is contracted until the top of the tooth of the upper tooth holder 23 abuts against the top of the tooth of the lower tooth holder 24, at which time the hinge assembly is in a stable state, and then the pushing force to the first connecting plate 20 is removed, the spring 22 releases the elastic force to push the first connecting plate 20 to move downward, and at the same time, under the action of the upper tooth holder 23 and the lower tooth holder 24, the first connecting plate 20 rotates therewith until the upper tooth holder 23 and the lower tooth holder 24 are re-engaged, at which time the hinge assembly returns to the initial state.

Furthermore, the utility model provides a device opens and shuts, this device opens and shuts can regard as ordinary door, cabinet door, window etc. to use in the scene of difference, and its primary structure includes activity door leaf 51 and fixed door leaf 52, and activity door leaf 51 is foretell first object promptly, and fixed door leaf 52 is foretell second object promptly, and wherein fixed door leaf 52 is fixed among the frame of constituteing the room body, the cabinet body or window form etc. and activity door leaf 51 realizes being connected with fixed door leaf 52 through foretell hinge subassembly.

Specifically, as shown in fig. 7, the movable door leaf 51 and the fixed door leaf 52 are both made of glass, the movable door leaf 51 is screwed and fixed with a screw post on the first connecting plate 20 on the hinge assembly through a first mounting plate 53, and the fixed door leaf 52 is screwed and fixed with a screw post on the second connecting plate 30 on the hinge assembly through a second mounting plate 54. The movable door 51 can then rotate relative to the fixed door 52.

The utility model provides a hinge subassembly and corresponding device that opens and shuts should open and shut the device and adopted this hinge subassembly to make its activity door leaf 51 can realize the oscilaltion in the pivoted, avoid activity door leaf 51's lower edge wearing and tearing.

The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through logical analysis, reasoning or limited experimentation in light of the above teachings of the invention or the above embodiments are intended to be included within the scope of the invention.

Claims (10)

1. A hinge assembly for connecting a first object to a second object, comprising:

the first connecting piece is fixedly connected to a first object and provided with a first tooth part with a downward tooth surface;

the second connecting piece is fixedly connected to a second object, is hinged with the first connecting piece, and is provided with a second tooth part with the tooth surface facing the first tooth part;

the second tooth part is configured and adapted to be matched with the first tooth part, so that when the first connecting piece rotates relative to the second connecting piece, the first connecting piece is pushed to move relative to the second connecting piece along the hinging axial direction of the first connecting piece and the second connecting piece through the inclined surface matching.

2. The hinge assembly of claim 1, further comprising a reset member; the two ends of the reset piece act on the first connecting piece and the second connecting piece and are configured and suitable for applying force to the first connecting piece so that the first connecting piece can be kept in an engaged state with the lower tooth holder when the force is not applied.

3. A hinge assembly as claimed in claim 2 wherein the reset member is a resilient member having two ends acting on the first and second coupling members respectively or two oppositely poled magnetic members mounted on the first and second coupling members respectively.

4. A hinge assembly according to any one of claims 1 to 3, further comprising a housing and a cover plate; the shell is hinged with the second connecting piece and limited by the second connecting piece in the upward direction of the hinged shaft, and is fixedly connected with the cover plate and matched with the cover plate to form an installation cavity; the first connecting piece is installed in the installation cavity.

5. A hinge assembly according to claim 4 wherein the cover plate is provided with a slot extending axially along the hinge of the first and second connectors.

6. The hinge assembly of claim 4, wherein said first connector includes a first connector plate and an upper gear seat; the upper tooth holder is in rotation stopping fit with the first connecting plate, and a first tooth part is arranged on the upper tooth holder; the second connecting piece comprises a second connecting plate and a lower tooth holder; the lower tooth holder is fixedly connected to the second connecting plate, and a second tooth part is arranged on the lower tooth holder; the first connecting plate is hinged with the second connecting plate.

7. The hinge assembly of claim 6, wherein the upper and lower brackets are plastic.

8. A hinge assembly as claimed in claim 6 or 7 wherein the first and second teeth are planar at the top of the teeth and at the bottom of the gullets.

9. The hinge assembly of claim 8, further comprising a hinge shaft; the second connecting piece also comprises a limiting plate; the hinge shaft rod penetrates through the first connecting piece and the second connecting piece; the limiting plates are fixedly connected to the second connecting plate and abut against two ends of the hinged shaft rod.

10. Opening and closing device comprising a movable door leaf and a fixed door leaf, characterized in that the connection between said movable and fixed door leaves is provided with a hinge assembly according to any one of claims 1 to 9.

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