CN220151197U

CN220151197U - Folding door unit and folding door

Info

Publication number: CN220151197U
Application number: CN202320997499.2U
Authority: CN
Inventors: 朱成; 何云彬; 何锦杰; 黄永前; 吴惠斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-12-08
Anticipated expiration: 2033-04-27

Abstract

The utility model provides a folding door unit and a folding door, wherein the folding door unit realizes the variable included angle between the upper door plate and the lower door plate in a mode of hinging the upper door plate by the frame of the upper door plate and the frame of the lower door plate, and then realizes the change of the coverage area of the folding door unit in a certain direction by the change of the included angle between the upper door plate and the lower door plate, so that the opening of a cave can be opened or closed. The folding door formed by expanding and connecting the plurality of folding door units in the first direction and the second direction can meet the requirement of a large-size door opening, gaps among the folding units dredge the air quantity born by the door plate, and the air speed of the air entering the door plate is reduced; the folding door can withstand wind impacts in different directions with respect to the rolling door. The folding door is suitable for being used at the wind-proof wall opening of a bulk storage yard or a building site, reduces wind speed, reduces dust emission of the storage yard, prevents the dust from overflowing through the opening, and meets the traffic of vehicles through opening and closing of the door.

Description

Folding door unit and folding door

Technical Field

The present utility model relates to the technical field of stationary closing devices for openings in enclosures, and in particular to a folding door unit and a folding door.

Background

Bulk cargo yards or building sites of ports and wharfs are piled in open air, dust is easily generated when the bulk cargo yards or building sites are blown by wind, and environmental pollution is caused, so that a wind-proof wall is formed by adopting a steel structure wind-proof curtain wall and a wind-proof screen board, and wind-proof walls can reduce wind speed around the open air yards to reduce dust, thereby achieving the environmental protection effect. But bulk storage yards or construction sites need trucks to go in and out, so that a plurality of door openings can be formed in the windproof wall, the air speed cannot be reduced by the hollow door openings, dust emission is increased, and the environmental protection effect is reduced.

In order to reduce the hollowed-out area of the windproof wall of a bulk cargo yard or a construction site, the wind speed is further reduced, dust in the yard or the construction site is prevented from overflowing through a door opening, meanwhile, the vehicle access management is optimized, a windproof door is arranged at the door opening, and the requirements of vehicle passing and environmental protection are met through opening and closing of the door.

The working environment of the air door comprises:

1. the wind-proof wall is often arranged in an open storage yard or a building site, and the wind speed is high, so that the wind-proof door is required to bear 8-level wind at maximum, and the requirement on the rigidity of the wind-proof door is high;

2. in open storage yards or construction sites, the wind direction is changeable, and the air door can be stressed by different directions;

3. the size of the door opening is large, and some can even reach 30m wide and 10m high;

4. the air conditioner is used for a wharf yard or a building site, has severe environment and large dust, and especially has large air humidity in the wharf yard, salt fog can exist in the air, and has large corrosion resistance to air doors.

Disclosure of Invention

The utility model aims to provide a folding door unit and a folding door, which have high rigidity, can bear strong wind in different directions, are free from limitation of size expansion and corrosion resistance, and are suitable for being used as a door at a wind-proof wall hollowed-out position of a bulk storage yard or a construction site.

To achieve the above object, the present utility model provides a folding door unit comprising:

an upper door plate, a lower door plate, a door plate connecting frame and a connecting rod;

the two door plate connecting frames which are arranged in parallel in the first direction and the two connecting rods which are arranged in parallel in the second direction are connected end to form a rectangular frame, and the first direction and the second direction are mutually perpendicular;

the upper door plate is connected with one frame at the edge of the upper door plate, and the lower door plate is connected with the other frame at the edge of the lower door plate;

the frame of the upper door plate is hinged with the frame of the lower door plate, and the hinge shaft is along the first direction;

wherein the upper door panel and the lower door panel have the same size in the first direction.

In one embodiment, the folding door unit further comprises:

the limiting structure is arranged on the connecting rod of the upper door plate, and when the limiting structure is contacted with the connecting rod of the lower door plate, the included angle between the contact surface of the limiting structure and the connecting rod of the lower door plate and the plane of the upper door plate is not equal to 90 degrees; or,

the limiting structure is arranged on the connecting rod of the lower door plate, and when the limiting structure is contacted with the connecting rod of the upper door plate, the included angle between the contact surface of the limiting structure and the plane where the lower door plate is positioned is not equal to 90 degrees.

In one embodiment, the two ends of the connecting rod are bent to form connecting ends in opposite directions, the connecting ends are provided with through holes, and the axial direction of the pupil is the first direction.

In one embodiment, the upper door plate and the lower door plate are distributed with holes in a matrix arrangement.

In one embodiment, in the second direction, the upper door plate has a size larger than that of the lower door plate.

In one embodiment, the ratio of the size of the upper door plate to the size of the lower door plate in the second direction is (1.4-1.6): 1.

The utility model also provides a folding door, comprising the folding door unit;

in the first direction, a plurality of folding door units are connected in series by transverse steel wire ropes;

in the second direction, the frame of the lower door panel of the folding door unit is hinged to the frame of the upper door panel of another folding door unit adjacent thereto.

In one embodiment, the folding door further comprises:

and the shaft sleeve penetrates through the frame of the lower door plate of the upper folding door unit and the frame of the upper door plate of the adjacent lower folding door unit, and the transverse steel wire rope penetrates through the shaft sleeve.

In one embodiment, the folding door further comprises:

the door frame, the folding door unit of the uppermost row is hoisted on the upper frame of the door frame, and the two ends of the upper edge and/or the lower edge of the folding door unit at the leftmost side and the rightmost side are respectively connected with the left side frame and the right side frame of the door frame through steel wire ropes;

a sled comprising steel wheels and a steel wheel frame, wherein:

the steel wheel frame comprises a first end and a second end, the first end of the steel wheel frame is connected with the upper edge and/or the lower edge of the folding door unit through a steel wire rope,

the steel wheel is arranged at the second end of the steel wheel frame, and the interaction force between the steel wheel and the left side frame or the right side frame of the door frame is kept by adjusting the tension of the steel wire rope between the first end of the steel wheel frame and the upper edge and/or the lower edge of the folding door unit.

In one embodiment, the pulley is provided with an axially vertical hole, and a longitudinal steel wire rope passes through the hole on the pulley;

a limiting structure is arranged at the lower end of the longitudinal steel wire rope, and the pulley at the lowest end is not separated from the longitudinal steel wire rope by the limiting structure;

the included angle between the upper door plate and the lower door plate is driven to change by changing the position of the lower end of the longitudinal steel wire rope.

According to the folding door unit, the included angle between the upper door plate and the lower door plate is variable in a mode of hinging the frame of the upper door plate and the frame of the lower door plate, and then the coverage area of the folding door unit in a certain direction is changed through the change of the included angle between the upper door plate and the lower door plate, so that the opening can be opened or closed.

The folding door formed after the folding door units are expanded and connected in the first direction and the second direction can meet the requirement of a large-size door opening. The gaps among the folding units dredge the air quantity born by the door plate, so that the wind speed of wind entering the door plate is reduced, and the impact of high wind on the door plate is reduced; the door panel in the form of a flat plate can withstand wind impacts in different directions with respect to a roll-up door.

The folding door provided by the utility model is suitable for being used at the wind-proof wall opening of a bulk storage yard or a construction site, further reduces wind speed, reduces dust emission of the storage yard, prevents dust of the storage yard or the construction site from overflowing through the opening, optimizes vehicle access management, and meets vehicle passing through opening and closing of the door.

Drawings

Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present utility model and do not constitute any limitation on the scope of the present utility model. Wherein:

fig. 1 is a schematic diagram of a door panel unit in a retractable door system according to a second embodiment of the present utility model;

FIG. 2 is an exploded view of parts in a door panel unit and at the junction between adjacent door panel units in a retractable door system according to a second embodiment of the present utility model;

fig. 3 is a schematic view of a part of a door panel unit in a retractable door system according to a second embodiment of the present utility model;

fig. 4 is a schematic diagram of a retractable door system according to a third embodiment of the present utility model after the door panel units are fully unfolded;

fig. 5 is a schematic diagram of a retractable door system according to a third embodiment of the present utility model after all door panel units are folded;

fig. 6 is a schematic view of a steel wheel frame and a part of a door frame in a retractable door system according to a third embodiment of the present utility model;

fig. 7 is a schematic view of a part of a door frame in a retractable door system according to a third embodiment of the present utility model.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the utility model more apparent. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the utility model. For a better understanding of the utility model with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure for the understanding and reading of the present disclosure, and are not intended to limit the scope of the utility model, which is defined by the appended claims, and any structural modifications, proportional changes, or dimensional adjustments, which may be made by the present disclosure, should fall within the scope of the present disclosure under the same or similar circumstances as the effects and objectives attained by the present utility model.

As used in this disclosure, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this disclosure, the term "plurality" is generally employed in its sense including "at least one" unless the content clearly dictates otherwise.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected or in communication; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1 to 3, the folding door unit provided in this embodiment includes: an upper door panel 11, a lower door panel 12, a door panel connecting frame 13 and a connecting rod 14;

two door panel connecting frames 13 arranged in parallel in a first direction (a lower left to upper right direction in fig. 1) and two connecting rods 14 arranged in parallel in a second direction (an upper left to lower right direction in fig. 1) are connected end to form a rectangular frame, and the first direction and the second direction are perpendicular to each other;

the upper door panel 11 is connected to one of the frames at its edge, and the lower door panel 12 is connected to the other of the frames at its edge;

the frame of the upper door panel 11 is hinged with the frame of the lower door panel 12, and the hinge shaft is along the first direction;

wherein the upper door panel 11 and the lower door panel 12 have the same size in the first direction.

The folding door unit provided in this embodiment further includes:

the limiting structure 7 is arranged on the connecting rod 14 of the upper door plate 11, and when the limiting structure 7 contacts with the connecting rod 14 of the lower door plate 12, the included angle between the contact surface 71 of the limiting structure 7 and the plane of the upper door plate 11 is not equal to 90 degrees.

In other embodiments, the limiting structure is disposed on the connecting rod of the lower door panel, and when the limiting structure contacts the connecting rod of the upper door panel, the contact surface 71 of the limiting structure and the connecting rod of the upper door panel is not equal to 90 degrees.

The limiting structure 7 is used for limiting the included angle between the upper door plate 11 and the lower door plate 12 to be unequal to 180 degrees in the unfolding state of the folding door unit, so that dead points are avoided, and the smooth change process from the unfolding state to the folding state of the folding door unit is ensured.

The limit structure 7 has the function of preventing reverse folding at the same time, and ensures that the folding directions of all the folding door units 1 are consistent during folding.

In this embodiment, the two ends of the connecting rod 14 are bent out of the connecting end 16 in opposite directions, the connecting end 16 is provided with a through hole 161, and the axial direction of the through hole 161 is the first direction. The frame of the upper door panel 11 is hinged with the frame of the lower door panel 12 by providing a rotation shaft in the through hole 161. When lower door panel 12 is folded towards upper door panel 11 and when folding between different folding units, because connecting ends 16 at two ends of connecting rod 14 are located at different sides of upper door panel 11 in this embodiment, a plurality of folding door units after folding can be more compact, and the upper door panel connecting frame 13 of upper door panel 11 after folding is all in the same vertical plane and has small strength requirement on the matrix structure for fixing the folding door units.

At the outermost side of the folding door unit in example 1 (leftmost side in fig. 3), a spacer 162 is also provided, the sandwich structure makes the hinge more stable and enables to avoid more wear for the connection end 16.

In this embodiment, the upper door panel 11 and the lower door panel 12 are distributed with holes 15 arranged in a matrix. Under the inventive concept of the present utility model of soft, the holes 15 allow the wind to pass through, so that the wind speed can be reduced, and the pressure borne by the wind can be reduced, so that the wind can bear larger and stronger wind.

In the present embodiment, the size of the upper door panel 11 is larger than the size of the lower door panel 12 in the second direction, and preferably, the ratio of the size of the upper door panel to the size of the lower door panel in the second direction is (1.4 to 1.6): 1.

In this embodiment, the folding door unit may be made of glass fiber reinforced plastic, stainless steel, aluminum alloy, etc. with different patterns and different colors.

Example 2

Referring to fig. 1 to 7, the present embodiment provides a folding door comprising a folding door unit 1 in embodiment 1;

in the first direction, a plurality of folding door units 1 are connected in series by a transverse wire rope 5;

in said second direction, the frame of the lower door panel 12 of a folding door unit 1 is hinged to the frame of the upper door panel 12 of another folding door unit 1 adjacent thereto.

The folding door provided in this embodiment further includes:

the boss 61, the boss 61 passes through the frame of the lower door panel 12 of the upper folding door unit 1 and the frame of the upper door panel 11 of the lower adjacent folding door unit 1 as hinge shafts therebetween, and the lateral wire rope 5 passes through the boss 61.

In the folding door provided in this embodiment, the pin 62 is provided, and the pin 62 passes through the through hole 161 on the connecting member 16 of the upper door panel 11 and the through hole 161 on the connecting member 16 of the lower door panel 12 as hinge shafts therebetween.

The folding door provided in this embodiment further includes:

the door frame, the folding door unit 1 of the uppermost row is hoisted on the upper frame 21 of the door frame, and the two ends of the upper edge and/or the lower edge of the folding door unit 1 at the leftmost side and the rightmost side are respectively connected with the left frame 23 and the right frame 22 of the door frame through steel wire ropes 5;

a sled comprising steel wheels 42 and a steel wheel frame 41, wherein:

a steel wheel frame 41 including a first end (an end on the right in fig. 6) and a second end (an end on the left in fig. 6), the first end of the steel wheel frame 41 being connected to the upper edge of the folding door unit 1 through a wire rope 5,

the steel wheels 42 are arranged at the second end of the steel wheel frame 41, in this embodiment, two steel wheels 42 are arranged at the second end of the steel wheel frame 41, and the two steel wheels 24 are symmetrical relative to the center line of the I-steel 24 arranged on the left side frame 23 or the right side frame 22 of the door frame. The interaction force between the steel wheel 42 and the left and right side frames 23 and 22 of the door frame is maintained by adjusting the tension of the wire rope 5 between the first end of the steel wheel frame 41 and the upper edge of the folding door unit 1. The wire rope 5 is thus kept in tension. Thereby ensuring that each row of door panel units 1 connected to the wire rope 5 is level.

The steel wheel frame 41 in the folding door provided by the embodiment is provided with an axial vertical through hole, and a longitudinal steel wire rope passes through the through hole on the steel wheel frame 41; in this way, a plurality of steel wheel frames 41 connected in series on the steel wire rope 5 can be driven to ascend or descend by the steel wire rope 5 in the longitudinal direction. In order to reduce the collision strength between the steel wire rope 5 and the through hole on the steel wheel frame 41 and the friction between the steel wire rope and the through hole, a pipe sleeve made of polyurethane is arranged in the through hole.

In a preferred embodiment, the lower surface of the steel wheel frame 41 is provided with a buffer block for buffering the collision between the pulleys adjacent to each other up and down during the unfolding or folding process.

The lower end of the longitudinal steel wire rope 5 is provided with an anti-drop block, and the lowest pulley is not separated from the longitudinal steel wire rope 5 by the anti-drop block;

the included angle between the upper door plate 11 and the lower door plate 12 is driven to change by changing the position of the lower end of the longitudinal steel wire rope.

In this example, the steel wheel frame 41 on one side of the folding door is directly connected with the steel wire rope 5, the steel wheel frame 41 on the other side of the folding door can be connected with the steel wire rope 5 through a basket bolt, and the tension of the steel wire rope 5 can be adjusted through the basket bolt.

In this embodiment, the left side frame 23 or the right side frame 22 is preferably fixedly connected with the wind-proof wall at the door opening side, the connection structure between the left side frame 23 or the right side frame 22 can adopt the structure shown in fig. 7, the connection i-steel 43 on the left side frame 23 or the right side frame 22 is connected with the wind-proof wall through the special-shaped connecting piece 92, the first connecting rod 91 and the second connecting rod 93, and the first connecting rod 91 and the second connecting rod 93 are respectively connected with two upright posts on the existing door opening. The profiled connecting piece 92 and the connecting I-steel 43 have at least two contact surfaces, and an included angle is formed between the two contact surfaces. The connection between the first and second connecting rods 91, 93 and the profiled connecting piece 92 and the wind wall is in a manner allowing for a certain tolerance and adjustment, for example in the form of a long hole mating bolt in fig. 7. The special-shaped connecting piece 92, the first connecting rod 91 and the second connecting rod 93 form a triangle, so that the door frame of the folding door is firmly and reliably connected with the air door.

The folding door provided by the embodiment can be used at the opening of the windproof wall arranged on the periphery of a bulk storage yard or a construction site, so that the wind speed is further reduced, dust raising in the storage yard is reduced, the dust in the storage yard or the construction site is prevented from overflowing through the opening of the door, and the environment-friendly requirement is met. Meanwhile, the folding door is opened and closed to meet the traffic of vehicles, and the vehicle access management is optimized.

In order to fold or unfold the folding door, provision is made for:

the electric hoist 3, set up a electric hoist 3 on the left and right sides of the upper frame 21 of the said door frame separately, the electrical machinery of the electric hoist 3 is installed on upper frame 21 of the said door frame, the wire rope of the electric hoist 3 passes a plurality of series steel wheel frames 41 positioned below it and is fixed with the steel wheel frame 41 of the lowest;

when the air door needs to be opened, an opening signal is sent to the control system on site or through a remote communication mode, the control system controls the motor of the electric hoist 3 to work and rotate positively, the steel wire rope is wound, the lower door plate 12 is folded towards the upper door plate 11 from the bottommost folding door unit 1, after the lower door plate 12 is folded to the position where the lower door plate and the upper door plate are most attached, the folding door units 1 adjacent to the lower door plate are folded, and the operation is sequentially carried out until the lower door plate is folded to the topmost part or the motor of the electric hoist 3 stops working after receiving the control signal.

When the air door needs to be closed, a closing signal is sent to the control system on site or through a remote communication mode, the control system controls the motor of the electric hoist 3 to work reversely, unwinds the steel wire rope, enables the bottommost folding door units 1 to move downwards, and enables the folding door units 1 to be unfolded gradually until the bottommost folding door units are unfolded or the motor of the electric hoist 3 stops working after receiving the control signal.

In fig. 5, all the folding door units 1 are in a folded state, and due to the gravity, the action of other folding door units and the external force provided by the electric hoist 3, the folding door units 1 are in an inclined state, if in rainy weather, the folding door units 1 in the inclined state do not have rainwater to remain, the load is smaller, and the rigidity requirements on the steel wire rope 5 and the door frame are reduced.

Considering that the use environment is open air and the dust is serious, salt fog exists in the use scene of the wharf, and the electric hoist 3 is protected by the protective cover.

In the embodiment, the electric hoist 3 is an electric wire rope hoist, or a loop chain electric hoist. However, by adopting the loop chain electric hoist, the pulley structure can be enlarged, and the lifting speed is low;

in this embodiment, the electric hoist 3 is fixed to the top. Or a structure that an electric hoist is fixed at the bottom and a fixed pulley is arranged at the top can be adopted. The top fixed electric hoist has simple structure and inconvenient high-altitude maintenance. The bottom is fixed with the electric hoist, the structure of the fixed pulley is complex at the top, and the ground maintenance is convenient. The specific embodiment is selected according to the emphasis in use.

In the embodiment, the electric hoist on two sides is synchronously controlled, and the structure of the steel wheel frames on two sides is pulled simultaneously. The winch device can be arranged in the middle, so that the purpose that one motor can simultaneously control the steel wheel frames at two sides to ascend or descend is achieved, the synchronism of the two sides is guaranteed, and the whole structure is complex.

A plurality of holes may exist on the windproof wall, the retractable door systems at the holes can be opened and closed through independent motors, each door plate can be operated in a local mode and a remote mode, the remote operation is to carry out remote wireless communication with the rear Fang Yun monitoring service through a 4G wireless communication module installed on the front retractable door system, and the independent opening and closing of the front retractable door system are supported to be controlled by upper computer system software and an APP customized development interface in a remote wireless mode.

The "local" control may implement the following functions:

1) An in-situ button on function;

2) The opening and closing process has an audible and visual alarm function;

3) The door is opened and closed in place to automatically stop the operation function;

4) The function can be opened mechanically and manually in case of failure;

the remote control adopts 4G wireless communication to realize the following functions:

1) A remote opening function;

2) The background is monitored remotely at any time and any place;

3) Monitoring and controlling motor operation functions;

4) Recording historical alarms and historical data functions

5) Automatic protection function:

when the wind pressure borne by the door plate is greater than the maximum working wind pressure, the door plate of the air-proof door system is automatically opened, so that the air-proof door system is prevented from being damaged by typhoons.

And is also provided with:

and a control system (not shown in the figure) connected with the electric hoist 3 and controlling the electric hoist 3 to work.

The number of the folding door units in the first direction and the second direction is set according to the size of the opening, so that the folding door provided by the utility model is flexible in size adjustment. Meanwhile, the present embodiment suggests that a plurality of folding door units 1 are included in one folding door. The preferred embodiment is a structure in which a plurality of folding door units 1 are provided, gaps are left between the folding door units 1, wind is allowed to pass through, and the wind speed is reduced, and impact on the door panels is reduced, so that the door panels are flexible. Through verification, the door plate and the door frame provided by the embodiment can bear 10-level wind.

The door frame is suitable for being arranged to be larger than the door opening, so that the folding door unit 1 can completely cover the hollowed-out part on the windproof wall, and the function of slowing down the wind speed is better achieved.

The technical scheme provided by the embodiment discards the design thought of 'with just gram and soft', and adopts the design thought of 'with soft gram and soft'. The folding door units 1 are connected in series up and down, the folding door units 1 are made of windproof net plates made of similar materials as windproof walls, transverse steel wire ropes penetrate through the folding door units 1, and wind load is overcome by the tension of the transverse steel wire ropes and the tension of the longitudinal steel wire ropes. When the folding door is opened, the folding door unit 1 with reasonable design can be folded to an inclined posture, and meanwhile, the limiting structure is arranged to prevent reverse folding, so that the folding door unit 1 can be ensured to be folded towards the designed direction. This structure can accommodate large-sized doors and 10-stage winds.

The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the present utility model. It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, the present utility model is intended to include such modifications and alterations insofar as they come within the scope of the utility model or the equivalents thereof.

Claims

1. Folding door unit, characterized in that it comprises: an upper door plate, a lower door plate, a door plate connecting frame and a connecting rod;

2. The folding door unit of claim 1, further comprising:

3. The folding door unit according to claim 1, wherein the connecting rod has two ends bent in opposite directions to form a connecting end, and the connecting end is provided with a through hole, and an axial direction of the through hole is the first direction.

4. The folding door unit of claim 1, wherein the upper door panel and the lower door panel are distributed with holes in a matrix arrangement.

5. The folding door unit of claim 1, wherein in the second direction, a size of the upper door panel is greater than a size of the lower door panel.

6. The folding door unit according to claim 5, wherein a ratio of a size of the upper door panel to a size of the lower door panel in the second direction is (1.4 to 1.6): 1.

7. A folding door comprising a folding door unit according to any one of claims 1 to 6;

8. The folding door of claim 7, further comprising:

9. The folding door of claim 7, further comprising:

a sled comprising steel wheels and a steel wheel frame, wherein:

the steel wheel is arranged at the second end of the steel wheel frame, and the interaction force between the steel wheel and the left side frame and the right side frame of the door frame is kept by adjusting the tension of the steel wire rope between the first end of the steel wheel frame and the upper edge and/or the lower edge of the folding door unit.

10. The folding door of claim 9, wherein the sled is provided with an axially vertical aperture through which a longitudinal wire rope passes;

the lower end of the longitudinal steel wire rope is provided with an anti-drop block, and the pulley at the lowest end is not separated from the longitudinal steel wire rope by the anti-drop block;