阅读说明：本技术 内置支铰的翻板闸门 (Flap gate with built-in support hinge ) 是由 史虹艳 韩文杰 侯俊文 于 2019-11-05 设计创作，主要内容包括：本发明提供了一种内置支铰的翻板闸门,涉及水利工程的技术领域,内置支铰的翻板闸门包括门体、支铰机构以及底槛；支铰机构包括支撑架、支撑筒以及支铰轴；支撑架分别与支撑筒和底槛固定连接；支撑筒套设在支铰轴的外部,支撑筒与支铰轴同轴设置,支撑筒与支铰轴能够产生相对转动；门体的底轴上设置有容纳槽；支撑筒与支铰轴均设置在容纳槽中,支铰轴与底轴固定连接。当门体相对于底槛转动时,支撑筒固定不动,门体带动支铰轴同步转动。底止水橡胶始终与底轴的外壁保持接触。由于支撑筒和支铰轴设置在底轴的内部,支铰轴不会对底轴与底止水橡胶接触的外壁造成影响,底止水橡胶的整体结构不会被打断,从而防止漏水现象的产生,提高封水效果。(The invention provides a flap gate with built-in support hinges, which relates to the technical field of hydraulic engineering and comprises a gate body, a support hinge mechanism and a bottom sill; the hinge mechanism comprises a support frame, a support cylinder and a hinge shaft; the supporting frame is fixedly connected with the supporting cylinder and the bottom sill respectively; the supporting cylinder is sleeved outside the hinge shaft, the supporting cylinder and the hinge shaft are coaxially arranged, and the supporting cylinder and the hinge shaft can rotate relatively; the bottom shaft of the door body is provided with an accommodating groove; the supporting cylinder and the supporting hinge shaft are both arranged in the accommodating groove, and the supporting hinge shaft is fixedly connected with the bottom shaft. When the door body rotates relative to the bottom sill, the supporting cylinder is fixed, and the door body drives the hinge shaft to synchronously rotate. The bottom water stop rubber is always in contact with the outer wall of the bottom shaft. Because a supporting cylinder and a hinge shaft are arranged in the bottom shaft, the hinge shaft cannot influence the outer wall of the bottom shaft contacted with the bottom water-stop rubber, and the whole structure of the bottom water-stop rubber cannot be broken, so that the water leakage phenomenon is prevented, and the water sealing effect is improved.)

1. A flap gate with built-in hinges, characterized in that the flap gate with built-in hinges comprises: the door body, the hinge mechanism and the bottom sill;

the hinge mechanism comprises a support frame, a support cylinder and a hinge shaft; the supporting frame is fixedly connected with the supporting cylinder and the bottom sill respectively; the supporting cylinder is sleeved outside the hinge shaft, the supporting cylinder and the hinge shaft are coaxially arranged, and the supporting cylinder and the hinge shaft can rotate relatively;

the bottom shaft of the door body is provided with an accommodating groove; the supporting cylinder and the supporting hinge shaft are both arranged in the accommodating groove, and the supporting hinge shaft is fixedly connected with the bottom shaft.

2. The internally hinged flap gate of claim 1 further comprising two securing components;

the hinge shaft comprises a rotating part and two protruding parts which are arranged at two ends of the rotating part respectively, the supporting barrel is sleeved outside the rotating part, the supporting barrel is sleeved with the two protruding parts, the two fixing assemblies are matched with the two protruding parts respectively, and the two protruding parts are fixedly connected with the bottom shaft.

3. The flap gate with built-in hinge according to claim 2, wherein the fixing assembly comprises a fixing bolt, a pressing plate and a connecting block;

the convex part is symmetrically provided with two planes, and the pressing plate and the connecting block are respectively abutted against the two planes; the connecting block is welded with the inside of the accommodating groove;

the fixing bolt sequentially penetrates through the pressing plate and the two planes and is fixedly connected with the connecting block.

4. The flap gate with built-in hinge according to claim 3, wherein a bearing is provided between the support cylinder and the hinge shaft;

and two ends of the bearing are respectively provided with a dustproof ring.

5. The internally hinged flap gate of claim 4, further comprising two dust caps;

the two dustproof covers are respectively arranged on two sides of the bearing, and the dustproof covers are arranged on one side, away from the bearing, of the dustproof ring; the dust cover is fixedly connected with the supporting cylinder.

6. The flap gate with built-in hinge according to claim 5, wherein a gasket is arranged on one side of each dust cover away from the support cylinder;

and the two sides of the gasket are respectively abutted against the corresponding connecting block and the supporting cylinder.

7. The internally hinged flap gate of claim 1 further comprising a fixing plate; the hinge mechanism further comprises a supporting plate; the supporting frame is fixedly connected with the fixing plate through the supporting plate; the fixed plate is fixedly connected with the bottom sill and is perpendicular to the bottom sill;

the supporting plate is a rectangular plate; limiting assemblies are respectively arranged on two sides of the supporting plate and one side far away from the bottom water stop rubber; the limiting assembly is abutted to the side face of the supporting plate and welded with the fixing plate.

8. The flap gate with built-in hinges as claimed in claim 7, wherein the limiting assembly comprises a plurality of limiting blocks;

the limiting blocks are arranged at intervals.

9. The flap gate with built-in hinge according to claim 1, wherein a gap exists between the support cylinder and an inner wall of the receiving groove.

10. The flap gate with built-in hinge according to any one of claims 1 to 9, wherein the hinge mechanism and the receiving groove are provided in plurality, and the hinge mechanism and the receiving groove are provided in one-to-one correspondence;

the holding tank is in even interval setting on the bottom shaft.

Technical Field

The invention relates to the technical field of hydraulic engineering, in particular to a flap gate with a built-in support hinge.

Background

The flap gate is a hydraulic gate in the field of hydraulic engineering machinery, can realize automatic control of water level, and is mainly used for intercepting or draining water flow in reservoirs, rivers, reservoirs and the like.

At present, a flap gate comprises a door body, a bottom sill, a hinge mechanism and a hoist. A support shaft of the support hinge mechanism is sleeved outside a bottom shaft of the door body, a support frame of the support hinge mechanism is fixed on a bottom sill, and the door body is rotatably connected with the bottom sill through the support hinge mechanism; one end of the hoist is rotatably connected with the door body, and the other end of the hoist is rotatably connected with the bottom sill; the door body, the bottom sill and the hoist form a triangular rotating structure.

In the prior art, the outer wall of a bottom shaft of a door body needs to be abutted against bottom water stop rubber so as to achieve the effect of water sealing; however, at the installation position of the hinge shaft, the whole structure of the bottom water-stop rubber is broken, and the water leakage phenomenon is easily formed.

Disclosure of Invention

The invention aims to provide a flap gate with a built-in hinge, which solves the technical problems that the integral structure of bottom water-stop rubber is broken at the arrangement position of a hinge shaft and water leakage is easy to occur in the prior art.

The invention provides a flap gate with a built-in hinge, which comprises: the door body, the hinge mechanism and the bottom sill; the hinge mechanism comprises a support frame, a support cylinder and a hinge shaft; the supporting frame is fixedly connected with the supporting cylinder and the bottom sill respectively; the supporting cylinder is sleeved outside the hinge shaft, the supporting cylinder and the hinge shaft are coaxially arranged, and the supporting cylinder and the hinge shaft can rotate relatively; the bottom shaft of the door body is provided with an accommodating groove; the supporting cylinder and the hinge shaft are both arranged in the accommodating groove, and the hinge shaft is fixedly connected with the bottom shaft.

Furthermore, the flap gate with the built-in support hinge also comprises two fixing components; the hinge shaft comprises a rotating part and two protruding parts which are arranged at two ends of the rotating part respectively, the supporting cylinder is sleeved outside the rotating part, and the two fixing assemblies are matched with the two protruding parts respectively to fixedly connect the two protruding parts with the bottom shaft.

Furthermore, the fixing assembly comprises a fixing bolt, a pressing plate and a connecting block; two planes are symmetrically arranged on the convex part, and the pressing plate and the connecting block are respectively abutted against the two planes; the connecting block is welded with the inside of the accommodating groove; the fixing bolt sequentially penetrates through the pressing plate and the two planes and is fixedly connected with the connecting block.

Further, a bearing is arranged between the support cylinder and the hinge shaft; two ends of the bearing are respectively provided with a dustproof ring.

Furthermore, the flap gate with the built-in hinge also comprises two dustproof covers; the two dustproof covers are respectively arranged on two sides of the bearing, and the dustproof covers are arranged on one side of the dustproof ring away from the bearing; the dust cover is fixedly connected with the supporting cylinder.

Furthermore, a gasket is arranged on one side, away from the supporting cylinder, of each dustproof cover; the two sides of the gasket are respectively abutted against the corresponding connecting block and the corresponding supporting cylinder.

Furthermore, the flap gate with the built-in support hinge also comprises a fixing plate; the hinge mechanism also comprises a supporting plate; the supporting frame is fixedly connected with the fixing plate through a supporting plate; the fixed plate is fixedly connected with the bottom sill and is perpendicular to the bottom sill; the supporting plate is a rectangular plate; the two sides of the supporting plate and one side far away from the bottom water stop rubber are respectively provided with a limiting component; the limiting assembly is abutted against the side face of the supporting plate and is welded with the fixing plate.

Furthermore, the limiting assembly comprises a plurality of limiting blocks; a plurality of spacing block interval sets up.

Further, there is the gap between the inner wall of a support section of thick bamboo and holding tank.

Furthermore, the number of the support hinge mechanisms and the number of the accommodating grooves are multiple, and the plurality of support hinge mechanisms and the plurality of accommodating grooves are arranged in a one-to-one correspondence manner; the holding tank sets up at even interval on the bottom shaft.

When the flap gate with the built-in hinge provided by the invention is used, when the door body rotates relative to the bottom sill, the support cylinder is fixed, and the door body drives the hinge shaft to synchronously rotate, namely, the hinge shaft can rotate relative to the support cylinder. In the rotating process, the bottom water-stop rubber is always in contact with the outer wall of the bottom shaft to ensure the sealing performance, and the hinge mechanism cannot interfere with the bottom water-stop rubber.

From the above, since the support cylinder and the hinge shaft are disposed in the accommodation groove, that is, the support cylinder and the hinge shaft are disposed inside the bottom shaft. Therefore, the arrangement of the supporting hinge shaft can not influence the outer wall of the bottom shaft contacted with the bottom water stop rubber, and the whole structure of the bottom water stop rubber can not be interrupted, thereby preventing the water leakage phenomenon and improving the water sealing effect.

Drawings

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

Fig. 1 is a partial structural sectional view of a flap gate with a built-in hinge according to an embodiment of the present invention;

FIG. 2 is a partial sectional view of the flap gate with built-in hinges according to another view of the present invention;

FIG. 3 is a cross-sectional view of a hinge mechanism provided in accordance with an embodiment of the present invention;

fig. 4 is an enlarged view of a portion a in fig. 3.

Icon: 1-a door body; 2-bottom sill; 3-a support frame; 4-a support cylinder; 5-a hinge shaft; 6-accommodating the tank; 7-a rotating part; 8-a projection; 9-fixing the bolt; 10-pressing a plate; 11-connecting blocks; 12-a bearing; 13-a dust ring; 14-a dust cover; 15-a gasket; 16-a support plate; 17-a limiting block; 18-a resilient gasket; 19-bottom water-stop rubber; 20-a hinge mechanism; 21-bottom axis; 22-fixing plate.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 3, a flap gate with a built-in hinge according to an embodiment of the present invention includes: the door body 1, the hinge mechanism 20 and the sill 2; the hinge mechanism 20 comprises a support frame 3, a support barrel 4 and a hinge shaft 5; the support frame 3 is respectively fixedly connected with the support cylinder 4 and the bottom sill 2; the supporting cylinder 4 is sleeved outside the hinge shaft 5, the supporting cylinder 4 and the hinge shaft 5 are coaxially arranged, and the supporting cylinder 4 and the hinge shaft 5 can rotate relatively; the bottom shaft 21 of the door body 1 is provided with an accommodating groove 6; the supporting cylinder 4 and the hinge shaft 5 are both arranged in the accommodating groove 6, and the hinge shaft 5 is fixedly connected with the bottom shaft 21.

Specifically, the door body 1 is mainly formed by welding a steel plate, profile steel and a seamless steel pipe, and plays a role in retaining water. The sill 2 is arranged on the bottom plate of the river channel and is a base of the whole flap gate with a built-in hinge, and the sill 2 can fix the door body 1 and the bottom water stop rubber 19. The bottom shaft 21 is arranged at the lower part of the door body 1 and is supported by a seamless steel pipe. The outer surface is a contact surface of the bottom water-stop rubber 19, so that the door body 1 can always obtain the water sealing effect when rotating. The bottom water stopping rubber 19 is arranged on the bottom sill 2, is in close contact with the bottom shaft 21, forms 3-5mm of compression amount, and achieves the effect of water sealing at the bottom of the flap gate with the built-in support hinge in the rotating process of the door body 1.

Wherein, the supporting frame 3 and the supporting cylinder 4 can be welded or integrally formed.

The supporting hinge shaft 5 and the bottom shaft 21 can be bolted, clamped or welded, and the like.

Preferably, the hinge shaft 5 and the bottom shaft 21 are detachably and fixedly connected. Therefore, the disassembly, assembly, maintenance or overhaul of workers can be facilitated.

The flap gate with the built-in hinge provided by the embodiment of the invention comprises: the door body 1, the hinge mechanism 20 and the sill 2; the hinge mechanism 20 comprises a support frame 3, a support barrel 4 and a hinge shaft 5; the support frame 3 is respectively fixedly connected with the support cylinder 4 and the bottom sill 2; the supporting cylinder 4 is sleeved outside the hinge shaft 5, and the supporting cylinder 4 is rotatably connected with the hinge shaft 5; the bottom shaft 21 of the door body 1 is provided with an accommodating groove 6; the supporting cylinder 4 and the hinge shaft 5 are both arranged in the accommodating groove 6, and the hinge shaft 5 is fixedly connected with the bottom shaft 21. In the use, when the door body 1 rotates for sill 2, support section of thick bamboo 4 is fixed motionless, and door body 1 drives a pivot 5 synchronous revolution, and pivot 5 can rotate for support section of thick bamboo 4 promptly. In the rotating process, the bottom water-stop rubber 19 is always in contact with the outer wall of the bottom shaft 21 to ensure the sealing performance, and the hinge mechanism 20 cannot cause interference on the bottom water-stop rubber 19.

As can be seen from the above, since the support cylinder 4 and the hinge shaft 5 are disposed in the accommodation groove 6, the support cylinder 4 and the hinge shaft 5 are disposed inside the bottom shaft 21. Thus, the arrangement of the hinge shaft 5 can not influence the outer wall of the bottom shaft 21 contacted with the bottom water-stop rubber 19, and the whole structure of the bottom water-stop rubber 19 can not be broken, thereby preventing the water leakage phenomenon and improving the water sealing effect.

As shown in fig. 1-3, on the basis of the above embodiment, further, the flap gate with built-in hinge further includes two fixing components; the supporting hinge shaft 5 comprises a rotating part 7 and two protruding parts 8 respectively arranged at two ends of the rotating part 7, the supporting cylinder 4 is sleeved outside the rotating part 7, and the two fixing components are respectively matched with the two protruding parts 8 so as to fixedly connect the two protruding parts 8 with the bottom shaft 21.

Preferably, two bulges 8 are symmetrically arranged relative to the supporting cylinder 4, and two fixing components are symmetrically arranged relative to the supporting cylinder 4, so that the stress of the joint is more uniform, and the service life of the structural part is prolonged.

The fixing assembly may include a fixing clip welded to the bottom shaft 21 and provided outside the protrusion 8 to fixedly connect the protrusion 8 to the bottom shaft 21.

In this embodiment, during use, the two fixing components are respectively matched with the two protrusions 8, so that the hinge shaft 5 is fixedly connected with the bottom shaft 21. Therefore, the stress at the joint can be more uniform, and the arrangement of the two joints can prevent the support hinge shaft 5 from deviating and rotating relative to the bottom shaft 21.

As shown in fig. 1 and 3, on the basis of the above embodiment, further, the fixing assembly comprises a fixing bolt 9, a pressure plate 10 and a connecting block 11; two planes are symmetrically arranged on the convex part 8, and the pressing plate 10 and the connecting block 11 are respectively abutted against the two planes; the connecting block 11 is welded with the inside of the accommodating groove 6; the fixing bolt 9 sequentially penetrates through the pressing plate 10 and the two planes and is fixedly connected with the connecting block 11.

Wherein, each plane can be correspondingly provided with two or more than two fixing bolts 9 so as to improve the stability of connection.

An elastic washer 18 is also arranged between the head of the fixing bolt 9 and the pressure plate 10.

The surface of the support hinge shaft 5 is plated with chrome, and two planes are milled on two sides, so that the pressing plate 10 can be conveniently placed and fixed.

The setting of connecting block 11 can bed hedgehopping support cylinder 4, prevents at the rotation in-process, and the inner wall of end axle 21 rubs with the outer wall of support cylinder 4.

Specifically, a threaded hole matched with the fixing bolt 9 is formed in the connecting block 11, and the fixing bolt 9 is screwed into the threaded hole to be fixedly connected with the threaded hole, so that the support hinge shaft 5 is fixedly connected with the bottom shaft 21.

One side of the pressure plate 10 far away from the fixing bolt 9 is in fit abutment with one plane of the protruding part 8, and one side of the connecting block 11 near the protruding part 8 is in fit abutment with the other plane of the protruding part 8.

In the embodiment, in the use process, the fixing bolt 9 sequentially penetrates through the two planes of the pressing plate 10 and the protruding part 8 and is fixedly connected with the connecting block 11; since the connecting block 11 is welded to the bottom shaft 21, the hinge shaft 5 can be fixedly connected to the bottom shaft 21. The two symmetrical planes of the convex part 8, the pressing plate 10 and the connecting block 11 are arranged in a matching way, so that the area of the connecting part can be increased, and the connection is more stable; bolted connection's the cost of setting up is lower, simple structure, convenient operation, and make things convenient for the staff dismouting to change or maintain.

As shown in fig. 4, on the basis of the above embodiment, further, a bearing 12 is arranged between the support cylinder 4 and the hinge shaft 5; both ends of the bearing 12 are respectively provided with dust rings 13.

Wherein the bearing 12 is a bimetallic self-lubricating bearing.

In this embodiment, in the use, when a supporting cylinder 4 and a hinge shaft 5 rotate relatively, the bearing 12 can reduce the frictional resistance between the two, the dust ring 13 can prevent dust from entering the inside of the hinge mechanism 20, and simultaneously, the inside of the hinge mechanism 20 that water and air enter can also be reduced, so as to slow down the corrosion of the rotating contact surface, thereby prolonging the service life of the structural member.

As shown in fig. 4, on the basis of the above embodiment, further, the flap gate with built-in hinge further includes two dust covers 14; the two dust covers 14 are respectively arranged at two sides of the bearing 12, and the dust covers 14 are arranged at one side of the dust ring 13 far away from the bearing 12; the dust cover 14 is fixedly connected with the support cylinder 4.

Specifically, the dust cover 14 is detachably and fixedly connected with the support cylinder 4, such as clamped or bolted connection.

In this embodiment, in the use, the setting of shield 14 can further play dustproof effect, reduces the inside that water and air got into hinge mechanism 20 simultaneously, can also play the effect of fixed dust ring 13 in addition.

As shown in fig. 4, on the basis of the above embodiment, further, a gasket 15 is arranged on one side of each dust cap 14 away from the support cylinder 4; the two sides of the gasket 15 are respectively abutted with the corresponding connecting block 11 and the corresponding support cylinder 4.

The washer 15 is made of stainless steel.

The washer 15 may be connected to the dust cap 14 by a connection bolt. The washer 15 is sleeved on the connecting bolt, and in addition, the connecting bolt can also be a countersunk head bolt.

The gasket 15 can be clamped with the dust cover 14, or the gasket 15 is clamped between the connecting block 11 and the dust cover 14 without connection.

Specifically, through holes for penetrating the fixing bolts 9 are formed in two planes of the protruding portion 8, the through holes are strip-shaped holes, and the extending direction of the strip-shaped holes is the same as that of the hinge shaft 5. That is, the fixing bolt 9 can be selectively engaged with different positions of the bar hole to selectively fix different positions of the plane. Both sides of the support cylinder 4 are provided with a plurality of washers 15. The staff can adjust the quantity of packing ring 15 according to actual conditions to increase or reduce the distance between a support section of thick bamboo 4 and the connecting block 11, thereby change the relative position of hinge mechanism 20 and bottom shaft 21, and then adjust the position of the door body 1, finally realize adjusting the flap gate side stagnant water's of built-in hinge the decrement. When the relative position is changed, the position of the fixing bolt 9 matched with the strip-shaped hole is changed correspondingly.

In the embodiment, in the using process, the friction between the dust cover 14 and the connecting block 11 can be reduced by the arrangement of the gasket 15, the cost of the gasket 15 is low, and the replacement cost is low.

As shown in fig. 1-3, on the basis of the above embodiment, further, the flap gate with built-in hinge further includes a fixing plate 22; the hinge mechanism 20 further includes a support plate 16; the supporting frame 3 is fixedly connected with the fixing plate 22 through the supporting plate 16; the fixed plate 22 is fixedly connected with the sill 2, and the fixed plate 22 is perpendicular to the sill 2; the support plate 16 is a rectangular plate; two sides of the supporting plate 16 and one side far away from the bottom water stop rubber 19 are respectively provided with a limiting component; the limiting component is abutted against the side face of the supporting plate 16 and is welded with the fixing plate 22.

Wherein, the supporting plate 16 and the sill 2 can be connected by bolts. Therefore, the parts can be conveniently disassembled, replaced or maintained by workers.

Specifically, the limiting assembly can comprise a strip-shaped limiting plate, and the limiting plate is made of metal. The length of the limiting plate is the same as that of the corresponding side edge of the supporting plate 16, and one side and two ends of the limiting plate, which are far away from the supporting plate 16, are respectively welded with the bottom sill 2.

The support plate 16 is made of metal.

The fixing plate 22 and the sill 2 may be welded.

In this embodiment, at the pivoted in-process of door body 1, because the both sides of backup pad 16 and keep away from the great atress of one side of end stagnant water rubber 19, spacing subassembly set up can play spacing effect to backup pad 16, prevent backup pad 16 atress skew. In addition, when the supporting plate 16 passes through bolted connection with sill 2, spacing subassembly's setting can also prevent that the bolt from receiving too big shearing force to guarantee the stability of connecting, increase of service life.

As shown in fig. 1 and fig. 2, on the basis of the above embodiment, further, the limiting component includes a plurality of limiting blocks 17; the plurality of stoppers 17 are arranged at intervals.

Preferably, a plurality of stopper 17 are evenly spaced apart and are set up, can make the atress of backup pad 16 more even like this.

In this embodiment, in the use process, one side and two ends of each limiting block 17 far away from the supporting plate 16 are respectively welded with the bottom sill 2. The welding area of the limiting assembly and the sill 2 can be increased due to the arrangement of the limiting blocks 17, so that the limiting capacity is improved.

As shown in fig. 1, in addition to the above embodiment, further, a gap exists between the support cylinder 4 and the inner wall of the housing groove 6.

Wherein, the thickness of the connecting block 11 is larger than the sum of the wall thickness of the bearing 12 and the wall thickness of the supporting cylinder 4. This enables a gap to exist between the support cylinder 4 and the inside of the housing groove 6.

In this embodiment, in the use, there is the gap between the inner wall of holding tank 6 and the support section of thick bamboo 4, and be noncontacting between the inner wall of holding tank 6 and the support section of thick bamboo 4 promptly. When the support cylinder 4 and the bottom shaft 21 rotate relatively in the rotation process of the door body 1, no friction is generated between the support cylinder 4 and the bottom shaft 21, so that the service life of the structural member is prolonged.

On the basis of the above embodiment, further, a plurality of the hinge mechanisms 20 and the accommodating grooves 6 are provided, and the plurality of hinge mechanisms 20 and the plurality of accommodating grooves 6 are arranged in a one-to-one correspondence manner; the accommodating grooves 6 are provided at regular intervals on the bottom shaft 21.

In this embodiment, in the use process, the accommodating grooves 6 are uniformly spaced on the bottom shaft 21, that is, the hinge mechanisms 20 are uniformly spaced along the extending direction of the bottom shaft 21 of the door body 1. The arrangement can ensure that the door body 1 is stressed more uniformly when rotating, and the rotating process is more stable, thereby prolonging the service life of the structural member.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.