CN216517761U

CN216517761U - Special folding ladder for tail water pipe

Info

Publication number: CN216517761U
Application number: CN202122534410.2U
Authority: CN
Inventors: 蒋勇
Original assignee: Chongqing Yuhao Hydroelectric Dev Co ltd
Current assignee: Chongqing Yuhao Hydroelectric Dev Co ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-05-13
Anticipated expiration: 2031-10-21

Abstract

The utility model provides a special folding ladder for a draft tube, which comprises a plurality of crawling ladders and a plurality of connecting blocks, wherein the crawling ladders are sequentially connected through the connecting blocks and are rotatably connected with the connecting blocks so as to realize that the crawling ladders can be folded or unfolded; one free end of the ladder stand positioned at the end part is rotatably connected with a hook and is also provided with a locking piece, and the locking piece is used for fixing the hook in a horizontal state or a vertical state; the ladder stand is characterized in that a casing is fixed on the ladder stand, and a limiting block which can move towards the direction of the connecting block and is in contact with another adjacent ladder stand is slidably connected with the casing. The ladder stand has better integral rigidity after being released, the trend that the ladder stand approaches to the wall of the draft tube during climbing is effectively inhibited, the shaking and the integral shaking between every two ladder stands are basically eliminated, the safety is greatly improved, the ladder stand is small in size, convenient and quick to stretch, mount and fold, and suitable for being carried and used in a narrow space similar to the draft tube.

Description

Special folding ladder for tail water pipe

Technical Field

The utility model relates to the technical field of folding ladders, in particular to a special folding ladder for a draft tube.

Background

The inspection of the draft tube is a standard project for overhauling a hydropower station unit, and because the draft tube is positioned below a water surface line, a person needs to isolate an inlet water source from an outlet water source before entering the draft tube for inspection, and then opens a manhole door for entering; the work in the tail water pipe belongs to limited space operation, the requirement on safety is high, particularly, the evacuation channel in emergency is reliable, the channel for entering and exiting the tail water pipe is usually that a ladder is erected in the tail water pipe from a manhole, a worker climbs the ladder after entering the manhole and then reaches the bottom plate of the tail water pipe from the ladder, or the tail water pipe is evacuated from the manhole after climbing the ladder from the bottom plate of the tail water pipe;

as shown in fig. 7, the height of the draft tube of the large and medium power station is generally five to ten meters from the manhole to the bottom plate, the draft tube is in an inverted cone shape below the manhole, a slope is arranged near the bottom plate, and a narrow gallery is arranged outside the manhole; the common integral steel straight ladder cannot pass through a gallery and a manhole due to the overlong length; the common extension ladder in the market needs to be placed in through a manhole after the manhole of the draft tube extends outwards, the size is still limited, and the extension ladder is difficult to operate when being retracted; the rope ladder is forbidden to be used in a limited space due to poor rigidity, large shaking and large climbing difficulty; therefore, a ladder which is suitable for being transported in a narrow space and is convenient to pass through, discharge and recover from a manhole is needed, the rigidity is good, the personnel climb without effort, and the requirement that the personnel quickly evacuate from a tail water pipe in emergency situations can be met.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a special folding ladder for a draft tube, which solves the problem that an integral steel straight ladder cannot pass through a gallery and a manhole due to overlong length; the extension ladder needs to be extended and unfolded outside the tail water manhole and then put in through the manhole, the size is still limited, and the extension ladder is difficult to operate when being retracted; the rope ladder has the problems of poor rigidity, large shaking and difficult climbing, and is forbidden to be used in a limited space.

In order to solve the technical problems, the utility model specifically adopts the following technical scheme:

a special folding ladder for a draft tube comprises a plurality of crawling ladders and a plurality of connecting blocks, wherein the crawling ladders are sequentially connected through the connecting blocks and are rotatably connected with the connecting blocks so as to realize that the crawling ladders can be folded or unfolded; one free end of the ladder stand positioned at the end part is rotatably connected with a hook and is also provided with a locking piece, and the locking piece is used for fixing the hook in a horizontal state or a vertical state; a casing is fixed on the crawling ladder, and a limiting block which can move towards the direction of the connecting block and is in contact with the other adjacent crawling ladder is connected in the casing in a sliding manner; a plurality of be equipped with supporting component on the folding ladder that the cat ladder is constituteed, supporting component is used for increasing the stability of laying after a plurality of cat ladders expand.

Compared with the prior art, the utility model has the following beneficial effects:

the stacked crawling ladders can be pulled one by one at the gate opening of the manhole door of the draft tube, the crawling ladders are placed into the draft tube one by one from the manhole, the limiting block is moved after each crawling ladder is placed, so that the limiting block is positioned at the position where the two crawling ladders are connected through the connecting block, and when the crawling ladders vertically downwards, the limiting block cannot move upwards due to gravity and only can be kept at the position where the connecting block is blocked; meanwhile, the limiting block is positioned on one side of the crawling ladder close to the tail water pipe and provided with the inner wall of the manhole door, so that the situation that two crawling ladders are folded towards the inner wall provided with the manhole door when a worker climbs the manhole door is prevented; after the hook is perpendicular to the crawling ladder, the hook is hung on the lower part of the manhole door orifice, the crawling ladders are in a suspension state, after the hook is hung on the lower part of the manhole door orifice, the locking piece is in contact with the hook to block the hook, the hook is prevented from continuing to rotate, and when the hook is not used, the hook and the crawling ladder are in a horizontal state and are convenient to store; the supporting component is also positioned on one side of the crawling ladder close to the inner wall of the draft tube with the manhole door, and then the supporting component is contacted with the inner wall of the draft tube with the manhole door, so that the stability of the crawling ladder is improved, and the crawling ladder is prevented from shaking towards the inner wall of the draft tube when a worker climbs; the ladder stand has better integral rigidity after being released, the trend that the ladder stand approaches to the wall of the tail water pipe provided with the manhole door during climbing is effectively inhibited, the shaking and the integral shaking between every two ladder stands are basically eliminated, the safety is greatly improved, the ladder stand has small volume, is convenient and quick to stretch, install and fold, and is suitable for being carried and used in a narrow space similar to the tail water pipe.

Drawings

FIG. 1 is a schematic view of the structure of the utility model showing the support rods and hooks deployed when a set of ladders are stacked;

FIG. 2 is a schematic structural view showing the support rods and the hooks being folded when the crawling ladders are stacked;

FIG. 3 is a cross-sectional view of the support rod of the present invention;

FIG. 4 is a schematic structural view of the stopper of the present invention;

FIG. 5 is a schematic structural view of the ladder stand internal threaded column shown in plan view;

FIG. 6 is a schematic view of the ladder of the present invention after being deployed;

fig. 7 is a schematic structural view of the ladder stand of the present invention in use.

In the figure: 1. climbing a ladder; 11. a cross bar; 12. climbing a pole; 2. connecting blocks; 3. a housing; 31. a limiting block; 32. an iron absorbing plate; 4. a support bar; 41. a screw; 42. a support block; 5. an iron absorption block; 6. hooking; 61. a rubber pad; 7. a magnet; 8. a threaded post; 9. a draft tube; 91. a manhole door.

Detailed Description

The details of the present invention will be described below with reference to the accompanying drawings and examples.

As shown in fig. 1, 2 and 7, the utility model provides a folding ladder special for a draft tube, which comprises a plurality of ladder stands 1 and a plurality of connecting blocks 2, wherein the ladder stands 1 are connected in sequence through the connecting blocks 2, and the ladder stands 1 are rotatably connected with the connecting blocks 2 to realize that the ladder stands 1 can be folded or unfolded; one of the free ends of the ladder stands 1 positioned at the end part is rotatably connected with a hook 6 and is also provided with a locking piece which is used for fixing the hook 6 in a horizontal state or a vertical state; a jacket 3 is fixed on the ladder stand 1, and a limiting block 31 which can move towards the direction of the connecting block 2 and is contacted with the other adjacent ladder stand 1 is connected in the jacket 3 in a sliding way; a plurality of be equipped with supporting component on the folding ladder that cat ladder 1 is constituteed, supporting component is used for increasing the stability of laying after a plurality of cat ladder 1 expand.

As shown in fig. 1, 2, 6 and 7, the support assembly includes a support rod 4 rotatably connected to the ladder stand 1 with a hook 6 fixed thereon, the support rod 4 is made of steel material, a magnet block 5 is further fixed to the ladder stand 1 with the hook 6 fixed thereon, and the magnet block 5 is in contact with the support rod 4 for fixing the support rod 4 in a horizontal or vertical state; and a telescopic component is arranged on the support rod 4. When a plurality of crawling ladders 1 are placed in the draft tube 9 to be in a vertical state, and a worker enters the draft tube 9 through the crawling ladders 1, the supporting rod 4 can be opened to enable the supporting rod 4 to be in a state shown in fig. 7, the supporting block 42 is in contact with the inner wall, provided with the manhole door 91, of the draft tube 9, the crawling ladder 1 positioned at the top in the draft tube 9 is supported, and the situation that the crawling ladder 1 moves towards the inner wall, provided with the manhole door 91, of the draft tube 9 when the worker climbs the crawling ladder 1 is avoided; when the supporting rod 4 is opened, the part of the supporting rod 4 departing from the supporting block 42 is contacted with the iron-attracting block 5, so that the supporting rod 4 can be prevented from continuing to rotate, and when the supporting rod 4 is folded, as shown in fig. 2, the iron-attracting block 5 can attract the supporting rod 4; the support rod 4 can be in a horizontal or vertical state with the ladder stand 1.

As shown in fig. 1, 2 and 3, the telescopic assembly includes a screw rod 41 connected with an internal thread at one end of the support rod 4 away from the magnet block 5, and a support block 42 located outside the support rod 4 is fixed at one end of the screw rod 41 away from the magnet block 5. The screw rod 41 can be rotated to adjust the position of the supporting block 42 according to different tail water pipes 9, so that the supporting block 42 can be better contacted with the inner wall of the tail water pipe 9 provided with the manhole door 91.

As shown in fig. 1 and 2, the locking piece is a magnet 7, the magnet 7 is fixed on the ladder stand 1 fixed with the hook 6 and contacts with the hook 6, and the hook 6 is made of steel material. Magnet 7 contacts with the inboard of couple 6, and when rotating couple 6 and be level or vertical state, magnet 7 all can contact with couple 6, carries on spacingly to couple 6, avoids couple 6 to continue to rotate, and magnet 7 can also adsorb couple 6, increases couple 6's stability.

As shown in fig. 4, an iron-attracting plate 32 is embedded in one surface of the limiting block 31, which is in contact with the ladder stand 1, and the ladder stand 1 is made of a steel material. When a group of crawling ladders 1 is placed in a tail water pipe, a plurality of crawling ladders 1 are in a vertical state, and the limiting blocks 31 can block the parts, connected by the connecting blocks 2, of the two crawling ladders 1 after the positions of the crawling ladders are adjusted, so that the crawling ladders 1 are prevented from being bent when workers climb the crawling ladders 1; the iron attracting plate 32 can be attracted on the two ladder stands 1, and the limiting block 31 is prevented from moving randomly.

As shown in fig. 1 and 5, the ladder stand 1 is composed of two cross bars 11 and a group of climbing rods 12, the group of climbing rods 12 is fixed between the two cross bars 11, and the cross bars 11 and the climbing rods 12 are rectangular steel pipes; the number of the hooks 6, the magnet 7 and the support rods 4 is two, and the two hooks 6, the magnet 7 and the support rods 4 are fixed on two cross rods 11 of the ladder stand 1 at the end parts respectively; the number of the casings 3 on each ladder stand 1 is two, the casings 3 are respectively fixed on the two cross rods 11, and the casings 3 and the limiting blocks 31 are not installed on the other ladder stand 1 which is farthest away from the ladder stand 1 fixed with the hook 6. The connecting blocks 2 are connected with the cross rods 11, and after a worker opens the group of ladder stands 1, the worker can climb downwards or upwards through the climbing rods 12; the limiting blocks 31 limit the cross rods 11, and the situation that two adjacent cross rods 11 connected through the connecting blocks 2 are folded is avoided.

As shown in fig. 5, a threaded hole is opened on the climbing rod 12, a threaded column 8 in threaded connection with the threaded hole on one climbing rod 12 is arranged in the ladder 1, and the length of the threaded column 8 is greater than the distance between two adjacent climbing rods 12 of two adjacent ladders 1 after being unfolded. When the staff climbed on climbing rod 12, can rotate screw thread post 8 and insert in adjacent cat ladder 1, make screw thread post 8 and the screw hole threaded connection on the climbing rod 12 in the adjacent cat ladder 1, the stability of further increase folding ladder in draft tube 9, the circumstances such as folding appear in cat ladder 1 when avoiding the staff to climb.

As shown in fig. 1 and 2, a rubber pad 61 is provided on the inner side of the hook 6. The rubber pad 61 can increase the stability of the hook 6 when hooked on the lower part of the opening of the manhole door 91.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides a special folding ladder of draft tube which characterized in that: the foldable ladder comprises a plurality of ladders (1) and a plurality of connecting blocks (2), wherein the ladders (1) are sequentially connected through the connecting blocks (2), and the ladders (1) are rotatably connected with the connecting blocks (2) so as to realize the folding or unfolding of the ladders (1); the free end of one ladder stand (1) positioned at the end part is rotatably connected with a hook (6) and is also provided with a locking piece which is used for fixing the hook (6) in a horizontal state or a vertical state; a jacket (3) is fixed on the ladder stand (1), and a limiting block (31) which can move towards the direction of the connecting block (2) and is contacted with the other adjacent ladder stand (1) is connected in the jacket (3) in a sliding way; a plurality of be equipped with supporting component on the folding ladder that cat ladder (1) are constituteed, supporting component is used for increasing the stability of laying after a plurality of cat ladders (1) expand.

2. The special folding ladder for the draft tube of claim 1, wherein: the support component comprises a support rod (4) which is rotatably connected with the ladder stand (1) fixed with a hook (6), the support rod (4) is made of steel materials, an iron absorption block (5) is further fixed on the ladder stand (1) fixed with the hook (6), and the iron absorption block (5) is in contact with the support rod (4) and is used for fixing the support rod (4) in a horizontal or vertical state; and a telescopic component is arranged on the supporting rod (4).

3. The special folding ladder for the draft tube of claim 2, wherein: the telescopic assembly comprises a screw rod (41) which is connected with the inner thread of one end of the support rod (4) deviating from the iron-absorbing block (5), and a support block (42) which is positioned outside the support rod (4) is fixed at one end of the screw rod (41) deviating from the iron-absorbing block (5).

4. The special folding ladder for the draft tube of claim 2, wherein: the locking piece is made of magnet (7), the magnet (7) is fixed on the ladder stand (1) fixed with the hook (6) and is in contact with the hook (6), and the hook (6) is made of steel materials.

5. The special folding ladder for the draft tube of claim 1, wherein: an iron absorbing plate (32) is embedded in one surface, which is in contact with the ladder stand (1), of the limiting block (31), and the ladder stand (1) is made of steel materials.

6. The ladder special for the draft tube of claim 4, wherein: the crawling ladder (1) consists of two cross rods (11) and a group of climbing rods (12), the group of climbing rods (12) is fixed between the two cross rods (11), and the cross rods (11) and the climbing rods (12) are made of rectangular steel pipes; the number of the hooks (6), the magnet (7) and the support rods (4) is two, and the two hooks (6), the magnet (7) and the support rods (4) are respectively fixed on two cross rods (11) of the ladder stand (1) at the end part; the number of the casings (3) on each ladder stand (1) is two, the casings (3) are respectively fixed on the two cross rods (11), and the casings (3) and the limiting blocks (31) are not installed on the other ladder stand (1) which is farthest away from the ladder stand (1) on which the hooks (6) are fixed.

7. The special folding ladder for the draft tube of claim 6, wherein: the climbing rod is characterized in that a threaded hole is formed in the climbing rod (12), a threaded column (8) in threaded connection with the threaded hole in one climbing rod (12) is arranged in the crawling ladder (1), and the length of the threaded column (8) is larger than the distance between two adjacent climbing rods (12) of the two adjacent crawling ladders (1) after the two climbing rods (12) are close to each other and unfolded.

8. The special folding ladder for the draft tube of claim 1, wherein: the inner side of the hook (6) is provided with a rubber pad (61).