CN219339724U - Flexible passageway dimension guardrail - Google Patents

Abstract

The utility model discloses a telescopic channel maintenance guardrail, which comprises an outer corridor body and an inner corridor body, wherein fixed fence components are arranged on the left side and the right side of the top surface of the outer corridor body, movable fence components are arranged on the left side and the right side of the top surface of the inner corridor body, each fixed fence component comprises an outer fence frame and a plurality of first fixed upright posts, and each outer fence frame comprises an upper outer fence and a lower outer fence which are vertically opposite; the movable fence component comprises an inner fence frame and a second fixed upright post, and the inner fence frame comprises an upper inner railing and a lower inner railing which are opposite up and down; at least two movable connecting devices are arranged between the inner rail frame and the outer rail frame, and a limiting structure for limiting the inner rail frame to be separated from the outer rail frame is also arranged between the inner rail frame and the outer rail frame. The utility model has the advantages of adaptability, low cost and high structural strength.

Description

Flexible passageway dimension guardrail

Technical Field

The utility model relates to the technical field of protective railings, in particular to a telescopic channel maintenance guardrail.

Background

A structure like an access bridge has a telescopic bridge body (the telescopic length is longer), and the bridge body comprises an inner channel (an inner corridor body) and an outer channel (an outer corridor body), and the inner channel can be retracted into the outer channel. The guardrail arranged at the top of the bridge body has certain difficulty, and the guardrail arranged at the top surface of the bridge body is telescopic because the bridge body is required to be telescopic, so that the conventional guardrail cannot be implemented.

In the prior art, steel cables or round steel are paved on the top surface of an inner channel to deal with the situation, and the steel cables or round steel are used for hanging safety belts. When maintenance personnel go to the top surface of the inner channel to carry out maintenance operation, the safety belt safety buckle on the body needs to be hung on a steel cable or round steel, and when the maintenance personnel move, the safety buckle also needs to be manually transferred. This is also a conventional practice for various manufacturers. Such as the simplest seat belt fastening device currently used by japanese, european and domestic manufacturers on top of internal channels. However, this solution, in which the hanging belt device is low and the whole channel is discontinuous, is inconvenient to use, is terrible if the user loses his foot, and is likely to be impacted during the falling process, and also causes physical and psychological damage, so that the user desires a better solution.

Although manufacturers at home and abroad also research and develop a safety protection system with high hanging safety belts, such as a boarding bridge with a telescopic cable guardrail and an out-of-control protection function of a middle channel disclosed in CN114919767A, the design adopts the safety protection system formed by a cable winding and unwinding device, can meet synchronous action when the channel stretches and adapts to the movement of the channel, but the mode has high cost, and the cable is not durable and is not popularized and used. And the structure of CN114919767A is only limited to a three-channel bridge, and the main function of the structure is to ensure that the middle channel cannot be out of control, and the structure is made into a flexible guardrail form, and meanwhile, the structure plays a role in preventing falling.

And some similar fields, such as telescopic guardrails at the top of the elevator, most of guardrails used are telescopic structures of an outer tube of an inner rod sleeve, and have low structural strength, short stroke and safety.

The present utility model has been made based on such a situation.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a rail type telescopic channel maintenance guardrail which is flexible, low in cost and high in structural strength.

The utility model is realized by the following technical scheme:

in order to solve the technical problems, the utility model provides a telescopic passage maintenance guardrail, which comprises an outer corridor body and an inner corridor body, wherein the outer corridor body and the inner corridor body are arranged along the front-back direction, the inner corridor body moves forwards and backwards to be telescopic into the outer corridor body, fixed fence components are arranged on the left side and the right side of the top surface of the outer corridor body, movable fence components are arranged on the left side and the right side of the top surface of the inner corridor body, the fixed fence components comprise an outer fence frame and a plurality of first fixed upright posts fixedly connected between the outer fence frame and the top surface of the outer corridor body, and the outer fence frame comprises an upper outer railing and a lower outer railing which are opposite up and down; the movable fence component comprises an inner fence frame and a second fixed upright post fixedly connected between the rear end of the inner fence frame and the top surface of the inner corridor body, and the inner fence frame comprises an upper inner railing and a lower inner railing which are opposite up and down; at least two movable connecting devices are arranged between the inner fence frame and the outer fence frame so that the outer fence frame supports the inner fence frame, and a limiting structure for limiting the inner fence frame to be separated from the outer fence frame is further arranged between the inner fence frame and the outer fence frame.

In order to further solve the technical problems to be solved, in the telescopic channel dimension guardrail provided by the utility model, each movable connecting device comprises an upper connecting structure arranged between an upper outer railing and a corresponding upper inner railing and a lower connecting structure arranged between a lower outer railing and a corresponding lower inner railing, the upper connecting structure and the lower connecting structure are both movable connecting structures, the movable connecting structures are sliding connecting structures or rolling connecting structures, and the limiting structures are arranged at the positions of the upper connecting structure and the lower connecting structure.

In order to further solve the technical problem to be solved, the utility model provides the telescopic channel maintenance guardrail, which is provided by the utility model, wherein the upper connecting structure comprises a first connecting piece, a second connecting piece and a first movable piece rotationally connected to the first connecting piece, and the first movable piece is in rolling connection or sliding connection with the second connecting piece; one of the first connecting piece and the second connecting piece is an upper inner railing, the other is an upper outer railing, and the limiting structure is arranged between the first movable piece and the second connecting piece.

In order to further solve the technical problem, the utility model provides the telescopic channel dimension guardrail, wherein the first movable piece is in rolling fit or sliding fit on the outer surface of the second connecting piece, and the limiting structure is a first limiting groove which is arranged on the first movable piece and can limit the second connecting piece to be separated.

In order to further solve the technical problem to be solved, in the telescopic channel dimension guardrail provided by the utility model, the first movable piece is in rolling fit or sliding fit in the inner cavity of the second connecting piece, and the limiting structure is an inner cavity with a C-shaped cross section of the second connecting piece.

In order to further solve the technical problem to be solved, the utility model provides the telescopic channel maintenance guardrail, which is provided by the utility model, wherein the lower connecting structure comprises a third connecting piece, a fourth connecting piece and a second movable piece fixedly connected to the third connecting piece, and the second movable piece is in rolling connection or sliding connection with the fourth connecting piece; one of the third connecting piece and the fourth connecting piece is a lower inner railing and the other is a lower outer railing, and the limiting structure is arranged between the second movable piece and the fourth connecting piece.

In order to further solve the technical problem to be solved, in the telescopic channel dimension guardrail provided by the utility model, the second movable piece is in rolling fit or sliding fit on the outer surface of the fourth connecting piece, and the limiting structure is a second limiting groove which is arranged on the second movable piece and can limit the fourth connecting piece to be separated.

In order to further solve the technical problem to be solved, in the telescopic channel dimension guardrail provided by the utility model, the second movable piece is in rolling fit or sliding fit in the inner cavity of the fourth connecting piece, and the limiting structure is an inner cavity with a C-shaped cross section of the fourth connecting piece.

In order to further solve the technical problem to be solved, the utility model provides the telescopic passage maintenance guardrail, wherein a plurality of second connecting rods for connecting the upper inner railing and the lower inner railing are arranged between the upper inner railing and the lower inner railing.

In order to further solve the technical problem to be solved, the telescopic channel dimension guardrail provided by the utility model is characterized in that a plurality of reinforcing rods for connecting the outer fence frame and the inner fence frame are arranged between the outer fence frame and the inner fence frame.

Compared with the prior art, the utility model has the following advantages:

1. the utility model uses the frame-shaped outer rail frame and the frame-shaped inner rail frame as the telescopic guardrail, namely the outer rail frame is composed of the upper outer rail and the lower outer rail which are opposite from top to bottom, and the inner rail frame is composed of the upper inner rail and the lower inner rail which are opposite from top to bottom.

2. The fixed fence component and the movable fence component which can stretch and retract relative to the fixed fence component are combined with the Cheng Wei guardrail, and the movable fence component is suspended relative to the inner corridor body, does not interfere with the stretching of the inner corridor body, and can adapt to the stretching change of the outer corridor body and the inner corridor body. The movable connecting device is used for connecting the inner railing frame with the corresponding outer railing frame in a sliding or rolling way, and the outer railing frame is used for supporting the suspended part of the inner railing frame, so that the structural strength of the inner railing frame is improved. And the limit structure ensures that the inner railing frame can move forwards and backwards along the outer railing frame without separation. Thus realizing the extension and retraction of the inner railing frame. Therefore, the utility model has the advantages of relatively simple structure, relatively high reliability, relatively low cost, and safer and more durable structure compared with a cable rope.

Drawings

The utility model is described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic view of the structure of the movable rail assembly retracting into the fixed rail assembly according to the first embodiment;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a cross-sectional view at C in FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 2 at B;

FIG. 6 is a cross-sectional view at D in FIG. 5;

FIG. 7 is a schematic diagram of a movable connecting structure according to a first embodiment;

FIG. 8 is a third schematic view of the movable connecting structure in the first embodiment;

FIG. 9 is a schematic view of an articulated structure in a second embodiment;

FIG. 10 is a schematic view of a third embodiment of the movable connecting structure;

FIG. 11 is a schematic diagram of a movable connection structure in a third embodiment;

FIG. 12 is a schematic view of the movable connecting structure in the fourth embodiment;

FIG. 13 is a schematic perspective view of the articulating mechanism of FIG. 12;

fig. 14 is a schematic view of a movable connection structure in a fourth embodiment;

FIG. 15 is an exploded view of the articulating mechanism of FIG. 14;

fig. 16 is a schematic diagram of the movable connection structure in the fifth embodiment.

Detailed Description

In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings and the detailed description.

A telescopic passage dimension fence as shown in fig. 1 to 16, comprising an outer corridor body 1 and an inner corridor body 2 arranged in a front-rear direction, and the inner corridor body 2 can be moved forward and backward so as to be telescopic into the outer corridor body 1. The utility model discloses a gallery, including the gallery body 1, the gallery body is equipped with the fixed fence subassembly 3 in the left and right sides limit of the top surface of the gallery body 1, the left and right sides limit of the top surface of the gallery body 2 is equipped with movable fence subassembly 4. The inner gallery body 2 can retract to extend out of the outer gallery body 1, and the top surface of the outer gallery body 1 is always exposed, so that the fixed rail assembly 3 can be directly fixed on the top surface of the outer gallery body 1; however, the upper surface of the inner body 2 is retracted to extend out of the outer body 1, so that the guard rail cannot be directly provided on the upper surface of the inner body 2. Therefore, the movable fence component 4 is adopted as the guardrail on the top surface of the inner gallery body 2, the movable fence component 4 is suspended relative to the inner gallery body 2 and does not interfere with the expansion and contraction of the inner gallery body 2, and the movable fence component 4 can expand and contract to the position of the fixed fence component 3 along with the expansion and contraction of the inner gallery body 2 so as to meet the protection requirement of an expansion and contraction channel, as described in more detail below.

More specifically, the fixed rail assembly 3 includes a peripheral frame 31, and a plurality of first fixed posts 32 fixedly connected between the peripheral frame 31 and the top surface of the gallery body 1. A plurality of first fixing posts 32 are arranged between the outer fence frame 31 and the top surface of the outer gallery body 1 for reinforcement. The outer rail frame 31 comprises an upper outer rail 311 and a lower outer rail 312 which are opposite up and down, namely, the upper outer rail 311 and the lower outer rail 312 form a frame like a ladder (namely, the outer rail frame 31), so that the structural strength is obviously enhanced, and the safety and the reliability are improved. Of course, the upper outer rail 311 and the lower outer rail 312 are both connected to the first stationary post 32 without additional connectors therebetween.

The movable rail assembly 4 comprises an inner rail frame 41 and a second fixed upright post 42 fixedly connected between the rear end of the inner rail frame 41 and the top surface of the gallery body 2. The inner rail frame 41 includes upper and lower inner rails 411 and 412 which are opposite to each other up and down. I.e. the upper inner rail 411 and the lower inner rail 412 also form a ladder-like frame (i.e. the inner rail frame 41), which is significantly stronger and more safe and reliable. Of course, a plurality of second connecting bars 43 are provided between the upper inner rail 411 and the lower inner rail 412 to connect the two.

Preferably, as shown in fig. 1, in order to further increase the structural strength of the inner frame 41, a plurality of reinforcing bars 44 may be used to connect the two inner frames 41 on the left and right sides together.

In the utility model, the rear end of the inner fence frame 41 is fixed at the rear end of the top surface of the inner corridor body 2 through the second fixing upright post 42, and other parts of the inner fence frame 41 are suspended above the top surface of the inner corridor body 2. However, in order to support the suspended portion of the inner frame 41 and to strengthen the structural strength of the inner frame 41, the present utility model provides at least two articulating means 5 between the inner frame 41 and the outer frame 31 such that the outer frame 31 supports at least two positions of the inner frame 41. Of course, a limiting structure for limiting the separation of the inner frame 41 from the outer frame 31 is also provided between the inner frame 41 and the outer frame 31. Namely, the suspended part of the inner frame 41 is movably connected (in sliding connection or rolling connection) with the corresponding outer frame 31 by the movable connection device 5, the suspended part of the inner frame 41 is supported by the outer frame 31, the structural strength of the inner frame 41 is improved, and the inner frame 41 can move back and forth along the outer frame 31, so that the inner frame 41 stretches and contracts.

The fixed fence component 3 and the movable fence component 4 which can stretch and retract relative to the fixed fence component 3 form a maintenance guardrail together, can adapt to the stretching change of the outer corridor body 1 and the inner corridor body 2, and has the advantages of relatively simple structure, relatively high reliability, relatively low cost, and relatively safer and more durable cable structure (the cable is easy to wear).

More specifically, each movable connecting device 5 includes an upper connecting structure 51 disposed between the upper outer rail 311 and the corresponding upper inner rail 411, and a lower connecting structure 52 disposed between the lower outer rail 312 and the corresponding lower inner rail 412, where the upper connecting structure 51 and the lower connecting structure 52 are both movable connecting structures, the movable connecting structures are sliding connecting structures or rolling connecting structures, and the limiting structures are disposed at the upper connecting structure 51 and the lower connecting structure 52.

Further, the upper connecting structure 51 includes a first connecting member, a second connecting member, and a first movable member 511 rotatably connected to the first connecting member, where the first movable member 511 is in rolling connection or sliding connection with the second connecting member; one of the first connecting piece and the second connecting piece is the upper outer rail 311 and the other is the upper inner rail 411, and the limiting structure is arranged between the first movable piece 511 and the second connecting piece. More specifically, the first movable member 511 is in rolling fit or sliding fit on the outer surface of the second connecting member, and the limiting structure is a first limiting groove 5111 provided on the first movable member 511 and capable of limiting the second connecting member from being separated. More specifically, the first movable member 511 is in rolling fit or sliding fit in the inner cavity of the second connecting member, and the limiting structure is an inner cavity of which the cross section of the second connecting member is C-shaped.

Further, the lower connecting structure 52 includes a third connecting member, a fourth connecting member, and a second movable member 521 fixedly connected to the third connecting member, where the second movable member 521 is in rolling connection or sliding connection with the fourth connecting member; one of the third and fourth connecting members is the lower inner rail 412 and the other is the lower outer rail 312, and the limiting structure is provided between the second movable member 521 and the fourth connecting member. More specifically, the second movable member 521 is in rolling fit or sliding fit on the outer surface of the fourth connecting member, and the limiting structure is a second limiting groove 5211 provided on the second movable member 521 and capable of limiting the fourth connecting member from being separated. More specifically, the second movable member 521 is in rolling fit or sliding fit in the inner cavity of the fourth connecting member, and the limiting structure is an inner cavity of the fourth connecting member with a C-shaped cross section.

Specific examples of the rolling connection structure and the sliding connection structure are as follows:

embodiment one: external rolling type

As shown in fig. 2-8, there is a first embodiment of the present utility model in which:

as shown in fig. 4, the first movable member 511 and the second movable member 521 are rolling bodies, i.e., rollers. The upper outer rail 311 is provided with a roller frame, the first movable member 511 is hinged to the roller frame, and the first movable member 511 is in rolling fit on the outer surface of the upper inner rail 411. Similarly, a roller frame is also provided on the lower outer rail 312, the second movable member 521 is hinged to the roller frame, and the second movable member 521 is in rolling engagement with the outer surface of the lower inner rail 412.

Of course, as shown in fig. 6, the first movable member 511 may be hinged to the inner rail 411 to be engaged with the upper outer rail 311 in a rolling manner, and the second movable member 521 may be hinged to the lower inner rail 412 to be engaged with the lower outer rail 312 in a rolling manner.

Further, as shown in fig. 6, the cross sections of the upper outer rail 311 and the lower outer rail 312 are circular, the first movable member 511 and the second movable member 521 are both U-shaped rollers, i.e., the first movable member 511 is provided with a U-shaped first limit groove 5111, the first limit groove 5111 is matched with the outer surface of the upper outer rail 311, the first movable member 511 can roll along the upper outer rail 311, and the first limit groove 5111 can also limit the first movable member 511 from falling out of the upper outer rail 311; the second movable member 521 is provided with a U-shaped second limiting groove 5211, the second limiting groove 5211 is matched with the outer surface of the lower outer rail 312, the second movable member 521 can roll along the lower outer rail 312, and the second limiting groove 5211 can also limit the second movable member 521 from falling out of the lower outer rail 312.

Alternatively, as shown in fig. 7, the cross sections of the upper outer rail 311 and the lower outer rail 312 are square, and the first movable member 511 and the second movable member 521 are V-shaped rollers, that is, the first limiting groove 5111 on the first movable member 511 and the second limiting groove 5211 on the second movable member 521 are V-shaped. The edges of the upper outer rail 311 and the lower outer rail 312 are vertical. The first movable piece 511 is in rolling fit with the upper outer rail 311 and is limited by virtue of the V-shaped first limiting groove 5111; the second movable member 521 is in rolling engagement with the lower outer rail 312 and is restrained by the V-shaped second retaining groove 5211.

Alternatively, as shown in fig. 8, the cross sections of the upper outer rail 311 and the lower outer rail 312 are square, and the first movable member 511 and the second movable member 521 are H-shaped rollers, that is, the first limiting groove 5111 and the second limiting groove 5211 are half-mouth shapes.

Embodiment two: built-in rolling type

As shown in fig. 9, the second embodiment of the present utility model is different from the first embodiment in that: in this embodiment, the cross sections of the upper outer rail 311 and the lower inner rail 412 are C-shaped, and the first movable member 511 and the second movable member 521 are rollers or balls; the first movable piece 511 is hinged on the upper inner rail 411, and the first movable piece 511 is inserted into and roll-fitted in the inner cavity of the upper outer rail 311; the second movable member 521 is hinged to the lower outer rail 312, and the second movable member 521 is inserted into and roll-fitted in the inner cavity of the lower inner rail 412. That is, the inner cavities of the upper outer rail 311 and the lower inner rail 412 form guide grooves for the first movable member 511 and the second movable member 521 to roll therein, respectively, and also can circumferentially limit the first movable member 511 or the second movable member 521, so as to prevent the first movable member 511 or the second movable member 521 from being separated.

Embodiment III: sliding type

As shown in fig. 10 and 11, the third embodiment of the present utility model is different from the first and second embodiments in that: in this embodiment:

as shown in fig. 10, the cross section of the upper outer rail 311 is C-shaped and the first movable member 511 is a slider, and the first movable member 511 is inserted into and slidably engaged with the inner cavity of the upper outer rail 311. The structure has the supporting function and the limiting function.

Alternatively, as shown in fig. 11, the cross section of the lower inner rail 412 is C-shaped, the second movable member 521 is a slider, and the second movable member 521 is inserted into and slidably engaged with the inner cavity of the lower inner rail 412.

Of course, an external sliding type may be used in addition to the above-described embedded sliding type. I.e. the sliding body 54 is a sliding fit over the outer surface (not shown) of the corresponding upper outer rail 311.

The sliding fit rail (upper outer rail 311, lower outer rail 312, upper inner rail 411 or lower inner rail 412) and the sliding body (first movable member 511 or second movable member 521) are only suitable for guiding and not suitable for bearing due to the large wear. Here, a combination of sliding and scrolling is preferred: as shown in fig. 10, the upper first movable member 511 adopts a slider, which is a sliding structure and mainly plays a guiding role; the lower second movable member 521 adopts a roller, is a rolling structure, and mainly plays a bearing role, and supports the inner rail frame 41 from below. Of course, the reverse is also possible, that is, as shown in fig. 11, the first movable member 511 above adopts rollers to play a role of bearing; the second movable member 521 is a slider, which serves as a guide.

Embodiment four: offset type

As shown in fig. 12 to 14, the fourth embodiment of the present utility model is different from the first to third embodiments in that in this embodiment, the upper inner rail 411 is deviated in the up-down direction with respect to the upper outer rail 311 and the lower inner rail 412 is deviated in the same direction with respect to the lower outer rail 312 (both are deviated downward as shown in fig. 12 and 13). Such a structure facilitates assembly.

As shown in fig. 14 and 15, the upper inner rail 411 and the upper outer rail 311, and the lower inner rail 412 and the lower outer rail 312 may be connected by a plurality of (two in the drawing) first movable members 511 or second movable members 521, so as to further enhance the structural strength of the guard rail.

Fifth embodiment: multi-section telescopic type

As shown in fig. 16, in the fifth embodiment of the present utility model, the multi-stage inner frame 41 is provided, and the multi-stage expansion and contraction can be performed, and the structure is longer after the full expansion and shorter after the full contraction. Preferably, the other inner frame 41 and outer frame 31 are C-shaped rails, except for the innermost inner frame 41, and the C-shaped openings are all inward and connected by rollers sequentially from outside to inside.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a flexible passageway dimension guardrail which characterized in that: the novel outer corridor comprises an outer corridor body (1) and an inner corridor body (2) which are arranged along the front-back direction, the inner corridor body (2) can move forwards and backwards to stretch into the outer corridor body (1), fixed fence components (3) are arranged on the left side and the right side of the top surface of the outer corridor body (1), movable fence components (4) are arranged on the left side and the right side of the top surface of the inner corridor body (2), the fixed fence components (3) comprise an outer fence frame (31) and a plurality of first fixed upright posts (32) fixedly connected between the outer fence frame (31) and the top surface of the outer corridor body (1), and the outer fence frame (31) comprises upper outer rails (311) and lower outer rails (312) which are opposite up and down; the movable fence component (4) comprises an inner fence frame (41) and a second fixed upright post (42) fixedly connected between the rear end of the inner fence frame (41) and the top surface of the inner gallery body (2), and the inner fence frame (41) comprises an upper inner fence (411) and a lower inner fence (412) which are opposite up and down; at least two movable connecting devices (5) are arranged between the inner fence frame (41) and the outer fence frame (31) so that the outer fence frame (31) supports the inner fence frame (41), and a limiting structure for limiting the separation of the inner fence frame (41) from the outer fence frame (31) is further arranged between the inner fence frame (41) and the outer fence frame (31).

2. A telescopic channel dimension barrier according to claim 1, wherein: every swing joint device (5) all including establish last connection structure (51) between last outer railing (311) and corresponding last interior railing (411) and establish lower connection structure (52) between outer railing (312) and corresponding lower interior railing (412), go up connection structure (51) and lower connection structure (52) and be swing joint structure, swing joint structure is sliding connection structure or rolling connection structure, go up connection structure (51) department and lower connection structure (52) department all are equipped with limit structure.

3. A telescopic channel dimension barrier according to claim 2, wherein: the upper connecting structure (51) comprises a first connecting piece, a second connecting piece and a first movable piece (511) rotatably connected to the first connecting piece, and the first movable piece (511) is in rolling connection or sliding connection with the second connecting piece; one of the first connecting piece and the second connecting piece is an upper inner railing (411) and the other is an upper outer railing (311), and the limiting structure is arranged between the first movable piece (511) and the second connecting piece.

4. A telescopic channel dimension barrier according to claim 3, wherein: the first movable piece (511) is in rolling fit or sliding fit on the outer surface of the second connecting piece, and the limiting structure is a first limiting groove (5111) which is arranged on the first movable piece (511) and can limit the second connecting piece to be separated.

5. A telescopic channel dimension barrier according to claim 3, wherein: the first movable piece (511) is in rolling fit or sliding fit in the inner cavity of the second connecting piece, and the limiting structure is an inner cavity with the cross section of the second connecting piece being C-shaped.

6. A telescopic channel dimension barrier according to claim 2, wherein: the lower connecting structure (52) comprises a third connecting piece, a fourth connecting piece and a second movable piece (521) fixedly connected to the third connecting piece, and the second movable piece (521) is in rolling connection or sliding connection with the fourth connecting piece; one of the third connecting piece and the fourth connecting piece is a lower inner railing (412) and the other is a lower outer railing (312), and the limiting structure is arranged between the second movable piece (521) and the fourth connecting piece.

7. The telescoping passage way dimensional guardrail of claim 6, wherein: the second movable piece (521) is in rolling fit or sliding fit on the outer surface of the fourth connecting piece, and the limiting structure is a second limiting groove (5211) which is arranged on the second movable piece (521) and can limit the fourth connecting piece to be separated.

8. The telescoping passage way dimensional guardrail of claim 6, wherein: the second movable piece (521) is in rolling fit or sliding fit in the inner cavity of the fourth connecting piece, and the limiting structure is an inner cavity with the cross section of the fourth connecting piece being C-shaped.

9. A telescopic channel dimension barrier according to claim 1, wherein: a plurality of second connecting rods (43) for connecting the upper inner railing (411) and the lower inner railing (412) are arranged between the upper inner railing and the lower inner railing.

10. A telescopic channel dimension barrier according to claim 1, wherein: a plurality of reinforcing rods (44) for connecting the outer frame (31) and the inner frame (41) are arranged between the outer frame and the inner frame.

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