CN109458121B

CN109458121B - Expansion door

Info

Publication number: CN109458121B
Application number: CN201811534464.5A
Authority: CN
Inventors: 胡学君
Original assignee: Foshan Nanhai Yingshenghuang Door Industry Co ltd
Current assignee: Foshan Nanhai Yingshenghuang Door Industry Co ltd
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2024-03-12
Anticipated expiration: 2038-12-14
Also published as: CN109458121A

Abstract

The invention relates to a telescopic door, which comprises a transmission system part, a door body and a telescopic part, wherein the transmission system part is connected with the door body; the telescopic part comprises two groups of telescopic plates hinged with each other, and the other ends of the telescopic plates are respectively hinged with the transmission system part or the door body and the door body, so that the transmission system part or the door body is connected with the door body through the telescopic parts. The invention has higher reliability and is not easy to be blocked; in the expansion and contraction process of the telescopic door, the hinge shaft moves up and down and cannot move horizontally to exceed the width of the telescopic door, so that the occupied space of the telescopic door is reduced; the strength of the telescopic part can be ensured, the head and the door body can also keep moving linearly under the limit of the telescopic plate, the movement of the transmission system part and the door body can not deviate from the straight line, and the service life of the telescopic door can be ensured.

Description

Expansion door

Technical Field

The invention relates to a telescopic door, a telescopic plate for the telescopic door, a processing method of the telescopic plate and a travelling wheel for the telescopic door.

Background

At present, the traditional expansion gate is tubular structure, is provided with the sliding tray in its transmission system portion main frame, and the one end of the flexible pipe of expansion portion imbeds in the sliding tray, and when the expansion gate moved, the one end of flexible pipe can reciprocate along the sliding tray in the sliding tray, and produces noise [ the one end of flexible pipe supports with the inner wall of sliding tray and holds and remove and produce the noise ].

In addition, after the telescopic door is used for a period of time, because dust and the like enter the sliding groove to accumulate into massive dirt, one end of the telescopic pipe is easy to move in the sliding groove and is not smooth or blocked, and the door body is damaged.

In addition, the specifications of the expansion part widths of the expansion doors required in the market are different, when the traditional expansion doors are produced, expansion cross pipes with different specifications are required to be prepared for the expansion part widths with different widths, standard parts cannot be adopted for production, and cost reduction is not facilitated.

The traditional flexible door for flexible door is tubular structure, and its flexible pipe's shape is non-uniform, and when transporting flexible door, the volume that occupies of flexible door is great, and the commodity circulation cost that needs is higher.

The conventional travelling wheel for the telescopic door is characterized in that a wheel hub of the travelling wheel is hinged to a wheel shaft by a bearing, and the bearing is easy to rust in rainy days, so that the wheel hub of the travelling wheel is blocked and cannot rotate.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a telescopic door which is high in reliability and not easy to be blocked.

The invention adopts the following detailed technical scheme: the telescopic door comprises a transmission system part, a door body and a telescopic part; the telescopic part comprises two groups of telescopic plates hinged with each other, and the other ends of the telescopic plates are respectively hinged with the transmission system part or the door body and the door body, so that the transmission system part or the door body is connected with the door body through the telescopic parts.

Further, the telescopic device also comprises a hinge shaft which is horizontally arranged and a mounting shaft which is horizontally arranged, wherein the two ends of the telescopic plate are respectively fixedly provided with a first connecting cylinder and a second connecting cylinder; the articulated shaft passes through the first connecting cylinder and the second connecting cylinder, so that the two groups of expansion plates are mutually articulated, the installation shaft is connected with the transmission system part or the door body, and the installation shaft passes through the first connecting cylinder or the second connecting cylinder respectively.

In the expansion and contraction process of the telescopic door, the hinge shaft moves up and down, and cannot move horizontally to exceed the width of the telescopic door, so that the occupied space of the telescopic door is reduced.

As one implementation mode, the group of expansion plates are expansion plates, two sides of the first connecting cylinder are provided with notches, the middle part of the second connecting cylinder is provided with notches, and the first connecting cylinder is positioned at the notches of the middle part of the second connecting cylinder.

The strength of the telescopic part can be ensured, the head and the door body can also keep moving linearly under the limit of the telescopic plate, the movement of the transmission system part and the door body can not deviate from the straight line, and the service life of the telescopic door can be ensured.

As one embodiment, the one set of expansion plates is two or more expansion plates, and the two sets of expansion plates are hinged in a staggered manner.

Can reduce the consumptive material of expansion plate, lower cost can also reduce choke power, the waterproof nature of expansion gate.

Further, the expansion plate is provided with a limiting device, so that the two groups of expansion plates of each expansion part are bent when the expansion door is unfolded.

The flexible door can be ensured to be contracted smoothly, and the reliability is higher.

Further, the expansion door further comprises a density frame, when the expansion door is unfolded, the two groups of expansion plates of each expansion part are upwards bent, and the density frame is hinged with the hinge shaft respectively.

The blocking density of the telescopic door can be improved, and meanwhile, when the telescopic door is contracted, the hinge shaft drives the density frame to move upwards, so that the density frame cannot move downwards to prop against the ground, the telescopic door can be ensured to be contracted smoothly, and the reliability is improved.

Further, the device also comprises a densification density frame which is respectively hinged with the expansion plates.

To further increase the blocking density of the retractable door as desired.

Drawings

Fig. 1 is a perspective view of a retractable door in the present invention. In fig. 1, part of the mounting shaft 6 is not shown.

Fig. 2 is a schematic side view of the telescoping door of the present invention. In fig. 2, thick dotted lines indicate virtual positions of the densified density frame 71.

Fig. 3 is a schematic perspective view of the telescopic portion 3.

Fig. 4 is an exploded perspective view of the expansion and contraction section 3.

Fig. 5 is a perspective view of the hinge shaft 5.

Fig. 6 is a schematic side view of the telescopic portion 3.

Fig. 7 is a schematic perspective view of the expansion and contraction section 3 according to another embodiment [ second embodiment ].

Fig. 8 is a schematic perspective view of a part of the expansion and contraction section 3.

Fig. 9 is a schematic perspective view of a part of the expansion and contraction section 3. In fig. 8 and 9, the two groups of expansion plates 4 are attached to each other.

FIG. 10 is a schematic perspective view of section I-I of FIG. 2.

Fig. 11 is an enlarged schematic view at ii of fig. 10.

Fig. 12 is a schematic view of the expansion plate profile 9 being processed into expansion plates 4.

Fig. 13 is a schematic view of the expansion plate 4 of a further embodiment of the expansion plate profile 9. In fig. 12 and 13, the thick dashed arrow indicates the direction of movement of the expansion plate profile 9; the thick dotted line indicates the parting line 91; the dotted filling represents the material reduction region 92.

Fig. 14 is a schematic perspective view of still another embodiment [ third embodiment ].

Fig. 15 is an exploded perspective view of the expansion and contraction section 3 according to still another embodiment [ third embodiment ].

Fig. 16 is an enlarged schematic view at iv of fig. 15.

Fig. 17 is an enlarged schematic view of the cross section at iii of fig. 14.

Fig. 18 is an exploded perspective view of fig. 14 at iii.

Fig. 19 is a perspective view of the running gear hub 82.

Fig. 20 is a schematic perspective view of the expansion and contraction section 3 according to another embodiment [ fourth embodiment ].

Fig. 21 is an exploded perspective view of the expansion and contraction section 3 according to another embodiment [ fourth embodiment ].

A transmission system part 1; a drive wheel 11; a transmission system portion main frame 12; a mounting frame 13; a door body 2; an operation port 21; a decorative cover 22; a telescopic part 3; the width A of the telescopic part; a telescoping plate 4; a first connecting cylinder 41; a second connecting cylinder 42; a limiting device 43; an inner stopper 431; an outer stopper 432; a pressure relief vent 44; edge sealing cover 45; a spacer 46; an inner limit cylinder 47; a combination 471; a mounting chute 48; a hinge shaft 5; a limit groove 51; a mounting shaft 6; a tip sleeve 61; a density frame 7; a densifying density frame 71; a travelling wheel 8; a wheel shaft 81; a travelling wheel hub 82; a non-slip groove 821; a positioning groove 822; an anti-drop bump 823; a lining member 83; a slip prevention protrusion 831; a positioning ring 832; a spacer 84; a running wheel cover 85; a wheel cover 86; a decorative cover 87; a latch 88; a telescoping plate profile 9; a parting line 91; a material reduction zone 92; cutting width B.

Detailed Description

The technical scheme of the invention will be described below with reference to the accompanying drawings.

As shown in fig. 1 to 14, the retractable door of the present invention includes a transmission system part 1, a door body 2, and a retractable part 3. In general, the transmission system part 1 is provided with a driving wheel 11, the driving wheel 11 is connected with a power device (not shown in the drawing) which is arranged in the transmission system part 1, the power device is usually a gear motor, and the like, so that the driving wheel 11 is electrified to rotate, the driving wheel 11 can drive the transmission system part 1 to move, and the transmission system part 1 drives the door body 2 to move, so that the expansion door expands and contracts. Typically, the number of the transmission system parts 1 is one, and the number of the door bodies 2 is one or more.

The telescopic part 3 comprises two groups of telescopic plates 4 hinged with each other, and the other ends of the telescopic plates 4 (namely, the other ends of the telescopic plates 4 hinged with each other) are respectively hinged with the transmission system part 1 or the door body 2 and the door body 2, so that the transmission system part 1 or the door body 2 is connected with the door body 2 through the telescopic part 3. The axes of the hinged positions of the two groups of mutually hinged telescopic plates 4 and the axes of the hinged positions of the other ends of the telescopic plates 4 and the transmission system part 1 or the door body 2 and the door body 2 respectively can be vertically or horizontally arranged.

In the expansion and contraction process of the expansion and contraction door, the other end of the expansion plate 4 (namely, the other end of the mutually hinged ends of the expansion plate 4) is hinged with the transmission system part 1 or the door body 2 and the door body 2 respectively, the other end of the expansion plate 4 cannot slide up and down along the sliding groove of the transmission system part 1 or the door body 2, so that the other end of the expansion plate 4 cannot abut against the sliding groove inner wall of the transmission system part 1 or the door body 2 to slide, noise is generated, and in addition, compared with the other end of the expansion plate 4 which is clamped in the sliding groove of the transmission system part 1 or the door body 2 and is easy to be clamped (the clamping is caused by dust and the like entering the sliding groove of the transmission system part 1 or the door body 2), the other end of the expansion plate 4 is hinged with the transmission system part 1 or the door body 2 and the door body 2 respectively, the reliability is higher, and the clamping is difficult.

Preferably, the telescopic door of the invention also comprises a hinge shaft 5 which is horizontally arranged and a mounting shaft 6 which is horizontally arranged, wherein the two ends of the telescopic plate 4 are respectively fixedly provided with a first connecting cylinder 41 and a second connecting cylinder 42; the hinge shaft 5 passes through the first connecting cylinder 41 and the second connecting cylinder 42, the hinge shaft 5 passes through the first connecting cylinder 41 of one expansion plate 4 and the second connecting cylinder 42 of the other expansion plate 4, so that the two groups of expansion plates 4 are hinged to each other, the mounting shaft 6 is connected with the transmission system part 1 or the door body 2, and the mounting shaft 6 passes through the first connecting cylinder 41 or the second connecting cylinder 42, respectively, so that the other end of the expansion plate 4, namely, the other end of the mutually hinged end of the expansion plate 4 is hinged to the transmission system part 1 or the door body 2, respectively. In the process of expanding and contracting the telescopic door, the hinge shaft 5 moves up and down, so that the shaft centers of the hinged positions of the two groups of mutually hinged telescopic plates 4 and the other end of the telescopic plate 4 are respectively in vertical arrangement with the shaft centers of the hinged positions of the transmission system part 1, the door body 2 and the door body 2, and the width of the telescopic door is exceeded, thereby being beneficial to reducing the occupied space of the telescopic door.

Typically, the mounting shaft 6 is threaded through the door body 2 with a nut, such that the mounting shaft 6 is coupled to the door body 2; the door body 2 is provided with an operation opening 21 which is opposite to the installation shaft 6, so that the nut can be conveniently rotated, and the shaft 6 is installed. In general, both sides of the door body 2 are detachably provided with decorative covers 22 covering the operation ports 21 [ detachable by means of snap-in grooves, but also by means of other means ].

Preferably, the group of expansion plates 4 is one expansion plate 4, two sides of the first connecting cylinder 41 are provided with notches (not shown in the drawing), the middle part of the second connecting cylinder 42 is provided with notches (not shown in the drawing), and the first connecting cylinder 41 is positioned at the notch of the middle part of the second connecting cylinder 42. The strength of the expansion plate 4 is high, and the stress of the expansion plate 4 is uniform, so that the strength of the expansion part 3 can be ensured.

When the group of expansion plates 4 is one expansion plate 4, the expansion plates 4 are integral and are not easy to bend [ along the direction in the plate surface of the expansion plates 4 ], in general, the plate surface width [ width in plane view ] of the expansion plates 4 is larger than the plate surface length [ length in plane view ] of the expansion plates 4, so that the expansion plates 4 are further not easy to bend [ along the direction in the plate surface of the expansion plates 4 ]. Because the expansion plate 4 is not easy to bend [ along the direction in the plate surface of the expansion plate 4 ] when the transmission system part 1 drives the door body 2 to move, even if adverse factors such as uneven ground exist, the transmission system part 1 and the door body 2 can keep moving linearly under the limitation of the expansion plate 4, the movement of the transmission system part 1 and the door body 2 cannot deviate from the straight line, and the service life of the expansion door can be ensured.

As still another embodiment [ third embodiment ], fig. 14 to 16; the group of expansion plates 4 is two or more than two expansion plates 4, and the two groups of expansion plates 4 are articulated in a dislocation manner [ one expansion plate 4 of one group of expansion plates 4, one expansion plate 4 of the other group of expansion plates 4, one expansion plate 4 of one group of expansion plates 4, and the like ]. The consumable of expansion plate 4 can be reduced, lower cost can also make the strong wind pass pressure release hole 44 easily, reduce the effort of strong wind to expansion plate 4, can also reduce expansion plate 4 and go up rainwater etc. [ form the space between the expansion plate 4 ], thereby can reduce choke power, the waterproof nature of expansion gate.

In this embodiment [ third embodiment ], the expansion plate 4 further includes an inner limiting cylinder 47, the inner limiting cylinder 47 is provided with a combination 471 extending outwardly, the limiting block 431 is fixedly provided in the inner limiting cylinder 47, the first connecting cylinder 41 and the second connecting cylinder 42 are each provided with an installation chute 48 extending inwardly, and the combination 471 is respectively embedded in the installation chute 48. Generally, the number of the installation sliding grooves 48 is equal to that of the installation sliding grooves 48, and the installation sliding grooves 48 are uniformly distributed around the axis of the inner limit cylinder 47. The sections of the first connecting cylinder 41 and the second connecting cylinder 42 have no hollow hole structure, a core pulling mechanism is not needed when the expansion plate 4 and the limiting cylinder 47 are produced, the production difficulty of the expansion plate 4 and the inner limiting cylinder 47 is low, and the cost can be further reduced.

In general, the number of the expansion and contraction parts 3 is two [ the expansion and contraction parts 3 located on the same horizontal plane are one row of expansion and contraction parts 3 ] or more than two rows. To increase the blocking density of the expansion door [ front view of the expansion door when being unfolded ], the size of the area divided by the expansion part 3, the transmission system part 1, the door body 2, the density frame 7 or the density frame 71 is smaller, the blocking density is higher ], and the strength is higher.

Further, the expansion plates 4 are provided with a limiting device 43, so that when the expansion door is unfolded, the two groups of expansion plates 4 of each expansion part 3 are bent and arranged [ i.e. the included angle between the two groups of expansion plates 4 is larger than zero degrees and smaller than one hundred eighty degrees ]. When the telescopic door is contracted, the acting force acting on the telescopic plate 4 cannot penetrate through the axle center of the hinge shaft 5, so that the hinge shaft 5 cannot move downwards, and the telescopic door can be ensured to be contracted smoothly, and the reliability is higher.

Further, the telescopic door of the invention further comprises a density frame 7, when the telescopic door is unfolded, the two groups of telescopic plates 4 of each telescopic part 3 are upwards bent, and the density frame 7 is hinged with the hinge shaft 5 respectively [ the hinge is realized in a mode that the hinge shaft 5 is inserted into the through hole ]. The blocking density of the telescopic door can be improved, and meanwhile, when the telescopic door is contracted, the hinge shaft 5 drives the density frame 7 to move upwards, so that the density frame 7 cannot move downwards to prop against the ground, the telescopic door can be ensured to be contracted smoothly, and the reliability is improved.

In general, the retractable door of the present invention may further include a densified frame 71, wherein the densified frame 71 is hinged to the retractable panel 4 respectively [ conventional hinging manner ]. To further increase the blocking density of the retractable door as desired.

As a preferred embodiment, the first connecting cylinder 41 and the second connecting cylinder 42 are respectively provided with an inner limiting block 431 with a circular sector-shaped section; the hinge shaft 5 is provided with a limiting groove 51 with a circular sector-shaped cross section, and the inner limiting block 431 is positioned in the limiting groove 51. The inner limiting block 431 props against the limiting groove 51 to enable the two groups of expansion plates 4 of each expansion part 3 to be bent upwards; in this embodiment, the expansion plate 4 is convenient to process [ the shapes of the sections of the expansion plate 4 are the same and can be made of the expansion plate profile 9 ], and the expansion plate 4 is not provided with extra protrusions, so that the expansion plate 4 is convenient to stack and the expansion plate 4 is convenient to transport.

The expansion plate 4 for the expansion door has the same cross-sectional shape of the expansion plate 4.

Further, the first connecting cylinder 41 and the second connecting cylinder 42 are fixedly arranged at two ends of the expansion plate 4 respectively, the axis of the first connecting cylinder 41 is overlapped with the top end surface of the expansion plate 4, and the axis of the second connecting cylinder 42 is overlapped with the bottom end surface of the expansion plate 4. When the telescopic door is contracted, the two groups of telescopic plates 4 can rotate to be mutually attached, so that the occupied area of the telescopic door when contracted can be reduced to the greatest extent; in addition, can pass behind first connecting cylinder 41 and the second connecting cylinder 42 with articulated shaft 5, rotate two sets of expansion plates 4 to laminating each other, this design has effectively shortened the longitudinal occupation of land length after the door body is opened, makes the gate passageway width great improvement, and the occupation volume of telescopic part 3 is less simultaneously, and the transport of being convenient for is saved the transportation expense.

Preferably, the group of expansion plates 4 is one expansion plate 4, two sides of the first connecting cylinder 41 are provided with notches (not shown in the drawing), and the middle part of the second connecting cylinder 42 is provided with notches (not shown in the drawing). The strength of the expansion plate 4 is high, and the stress of the expansion plate 4 is uniform, so that the strength of the expansion part 3 can be ensured.

Further, the expansion plate 4 is provided with a pressure relief hole 44 therethrough. The strong wind easily passes through the pressure release holes 44, so that the acting force of the strong wind on the expansion plate 4 can be reduced, and the rainwater and the like on the expansion plate 4 can be reduced, thereby improving the wind resistance and the water resistance of the expansion door.

As another embodiment [ second embodiment, fourth embodiment ], as shown in fig. 7, 20, and 21, the expansion plate 4 is fixedly provided with an outer stopper 432. The outer limiting block 432 abuts against the expansion plates 4 to enable the two groups of expansion plates 4 of each expansion part 3 to be bent upwards.

The manufacturing method of the expansion board 4 for the expansion door comprises the following steps,

the expansion plate profile 9 is cut along the parting line 91 to form the expansion plate 4. Typically, the length of the expansion plate profile 9 is longer, and this step is carried out continuously on a conventional profile cutter (not shown in the figures), which is advantageous for improving the production efficiency and reducing the costs.

The expansion plate profile 9 is punched along the material reduction region 92 to form notches on both sides of the first connecting cylinder 41, and notches or pressure relief holes 44 in the middle of the second connecting cylinder 42.

And adjusting the slitting width B to form the expansion plate 4 with different slitting widths B. The adjustment of the slitting width B can be achieved by adjusting the position of the cutter of the profile cutter (not shown in the figures). The expansion part width A of the expansion part 3 required in the market is different in specification; the slitting width B of the expansion plate 4 can be conveniently adjusted according to the requirement, which is beneficial to reducing the cost.

As shown in fig. 17 to 19, the door body 2 is provided with a running wheel 8, and the running wheel 8 includes at least a running wheel shaft 81 and a running wheel hub 82, and the running wheel shaft 81 is connected to the door body 2. For example, the travelling wheel shaft 81 passes through the door body 2 to connect the travelling wheel shaft 81 with the door body 2 [ the conventional travelling wheel shaft 81 adopts a structure with an axle rubber chain ], so that the cost can be reduced.

The running wheel 8 further comprises an inner lining member 83 made of hard plastic, such as ABS plastic, PPS plastic or the like, the inner lining member 83 being embedded in the running wheel hub 82, and the running wheel shaft 81 passing through the inner lining member 83. The lining member 83 does not rust, does not cause the running wheel 8 to seize, and is low in cost compared with the use of bearings.

Further, the running wheel 8 further comprises a spacer 84, wherein the spacer 84 is fixedly connected to one end of the running wheel shaft 81 [ e.g. by means of a buckle, or by inserting a pin 88 into a pin hole provided in the running wheel shaft 81, etc. ]. The running wheel hub 82 can be prevented from moving along the running wheel shaft 81 to come off.

Preferably, the inner cavities of the lining member 83 and the running wheel hub 82 are both in a truncated cone shape, i.e. the cross section of the lining member 83 and the cross section of the running wheel hub 82 are both trapezoidal, and the base angle of the trapezoid is typically 85-90 degrees. The liner 83 is easily inserted into the interior cavity of the running gear hub 82 for pre-assembly.

Further, a positioning groove 822 is formed in the traveling wheel hub 82, and a positioning ring 832 is arranged on the lining member 83 in an extending manner; the positioning ring 832 is located in the positioning slot 822 and abuts against the cross section of the positioning slot 822. The wheel shaft 81 is prevented from being pulled, the gasket 84 abuts against the lining member 83 to enable the lining member 83 to excessively move, the inner cavity of the lining member 83 is reduced, and the wheel shaft 81 is prevented from being abutted against to rotate to compensate or be blocked.

Further, the running wheel hub 82 is provided with anti-slip grooves 821, the inner lining member 83 is provided with anti-slip protrusions 831, and the anti-slip protrusions 831 are respectively fitted into the anti-slip grooves 821. To prevent slippage between the inner lining member 83 and the running gear hub 82 (i.e., the inner lining member 83 rotates relative to the running gear hub 82), causing wear of the inner lining member 83, and then the inner lining member 83 falls off from the running gear hub 82, causing damage to the running gear 8. In general, the number of the anti-slip protrusions 831 is two or more, and is uniformly distributed around the axial center of the lining member 83, so as to improve the anti-slip effect.

Further, the running wheel hub 82 is wrapped with a running wheel outer sleeve 85 made of an elastic material [ such as rubber, etc. ]; to absorb vibration generated when the traveling wheel cover 85 moves, to have strong friction with the ground, to prevent traveling and ground slipping, to reduce noise, and the like.

Further, the traveling wheel hubs 82 are uniformly and fixedly provided with anti-falling protruding points 823 around the axle center of the traveling wheel hubs 82; to prevent slipping between the wheel cover 85 and the wheel hub 82 and also to prevent the wheel cover 85 from falling off the wheel hub 82.

Typically, the running wheel 8 further comprises a running wheel cover 86, the running wheel cover 86 covering the inner cavity of the running wheel hub 82 and being detachably connected to the running wheel hub 82 [ by means of a snap-in-slot ]. It is to be understood that the terms "center," "longitudinal," "transverse," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the scope of the invention.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, but any modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. The flexible door, its characterized in that: the door comprises a transmission system part (1), a door body (2) and a telescopic part (3); the telescopic part (3) comprises two groups of telescopic plates (4) which are hinged with each other, and the other ends of the telescopic plates (4) are respectively hinged with the transmission system part (1) or the door body (2) and the door body (2), so that the transmission system part (1) or the door body (2) is connected with the door body (2) through the telescopic part (3);

the telescopic connecting device also comprises a hinge shaft (5) which is horizontally arranged and a mounting shaft (6) which is horizontally arranged, wherein a first connecting cylinder (41) and a second connecting cylinder (42) are respectively and fixedly arranged at two ends of the telescopic plate (4); the hinge shaft (5) passes through the first connecting cylinder (41) and the second connecting cylinder (42) so as to enable the two groups of expansion plates (4) to be mutually hinged, the installation shaft (6) is connected with the transmission system part (1) or the door body (2), and the installation shaft (6) passes through the first connecting cylinder (41) or the second connecting cylinder (42) respectively;

the door body (2) is provided with a travelling wheel (8).

2. The retractable door of claim 1, wherein: the group of expansion plates (4) are expansion plates (4), two sides of the first connecting cylinder (41) are provided with notches, the middle part of the second connecting cylinder (42) is provided with notches, and the first connecting cylinder (41) is positioned at the notches of the middle part of the second connecting cylinder (42).

3. The retractable door of claim 1, wherein: the group of expansion plates (4) is two or more than two expansion plates (4), and the two groups of expansion plates (4) are articulated in a staggered manner.

4. The retractable door of claim 1, wherein: the expansion plates (4) are provided with limiting devices (43), so that the two groups of expansion plates (4) of each expansion part (3) are bent when the expansion door is unfolded.

5. A retractable door as in any one of claims 1-4, wherein: the telescopic door further comprises a density frame (7), when the telescopic door is unfolded, the two groups of telescopic plates (4) of each telescopic part (3) are upwards bent, and the density frame (7) is hinged with the hinge shaft (5) respectively.

6. The retractable door of claim 5, wherein: the device also comprises a densification density frame (71), wherein the densification density frame (71) is respectively hinged with the expansion plate (4).