CN113445898A - Wind power generation pylon cat ladder half space device - Google Patents
Wind power generation pylon cat ladder half space device Download PDFInfo
- Publication number
- CN113445898A CN113445898A CN202110719644.6A CN202110719644A CN113445898A CN 113445898 A CN113445898 A CN 113445898A CN 202110719644 A CN202110719644 A CN 202110719644A CN 113445898 A CN113445898 A CN 113445898A
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- Prior art keywords
- rest platform
- ladder
- cat ladder
- connecting rod
- plate
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/16—Platforms on, or for use on, ladders, e.g. liftable or lowerable platforms
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
The invention discloses a ladder stand and rest platform device for a wind power generation tower, and aims to provide a ladder stand and rest platform device for a wind power generation tower, which is convenient to retract and release and does not influence the ladder stand of a worker. It includes the rest platform board, sets up at the cat ladder supporting component of cat ladder both sides, sets up on the cat ladder and lie in the last mounting panel unit of cat ladder supporting component's top and arrange lock position handle and link assembly in cat ladder one side, one side of rest platform board is articulated on the cat ladder supporting component who lies in the rest platform board below through the hinge, and the hinge is arranged in the same one side of cat ladder with link assembly, link assembly links to each other including articulated connecting rod and lower connecting rod, the upper portion of going up the connecting rod rotates through the axis of rotation and sets up on last mounting panel unit, and the lower part of lower connecting rod is articulated continuous through pivot and rest platform board, and the rest platform board has the user state and packs up the state, and the lock position handle is used for driving link assembly, makes the rest platform board rotate around the hinge.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a ladder stand rest platform device of a wind power generation tower.
Background
With the increasing requirements of the state on environmental protection, wind power generation is rapidly developed in the years, and meanwhile, in order to improve the efficiency of the wind power generation and reduce the power generation cost, the wind power technology is developing towards the technical direction of large models and high towers. In the prior art, when an operator goes to a nacelle from the bottom of a tower, the operator needs to climb the ladder arranged inside the tower, the distance between two-dimensional protective platforms of the tower is often dozens of meters or even twenty-few meters, if the middle protective platform has no rest platform, the requirements on physical strength and perseverance of the operator are high, the requirements on the specification of the platform and the ladder in the national standard are not met, and great threat is brought to the personal safety of the operator. Therefore, the wind power tower needs a general ladder rest platform.
Wind power tower rest platform among the prior art often depends on cat ladder design and development, perhaps hangs on cat ladder support arm, but this kind of rest platform can not use with the lift or exempt from the climber simultaneously, makes the staff very inconvenient from top to bottom when the cat ladder.
The invention provides a tower rest platform and a tower, and the name of the invention creation is the tower rest platform and the tower, and the application discloses the tower rest platform and the tower, wherein the Chinese patent publication No. CN205189739U discloses 2016, 4, 27. The utility model discloses a pylon half space, it includes two at least couples, suspender and layer board, at least two the couple passes through the suspender with the both ends of layer board link to each other. The utility model discloses a pylon half space that provides adopts the couple, the suspender, the suspended structure is constituteed to the layer board, the couple can hang the layer board with the help of existing horizontal support on the cat ladder, the point of hanging of couple can be adjusted as required, thereby the distance between adjustment layer board and the cat ladder, make the user of service can have suitable posture and home range, this kind of suspended structure has broken away from the defect that traditional structure received space restriction, the layer board can provide bigger rest space, the user of service can stand on the layer board or sit on the layer board. This scheme is only through setting up mechanisms such as layer board, suspender and provides rest platform for the user, and it is very insecure to feel.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides the wind power generation tower ladder stand rest platform device which is convenient to retract and release and does not influence the ladder stand of a worker.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a wind power generation tower cat ladder half space device comprises a half space plate, cat ladder supporting components arranged on two sides of the cat ladder, an upper mounting plate unit arranged on the cat ladder and positioned above the cat ladder supporting components, and a locking handle and a connecting rod assembly arranged on one side of the cat ladder, wherein one side of the half space plate is hinged on the cat ladder supporting components positioned below the half space plate through a hinge shaft, the connecting rod assembly comprises an upper connecting rod and a lower connecting rod which are hinged, the upper part of the upper connecting rod is rotatably arranged on the upper mounting plate unit through a rotating shaft, the lower part of the lower connecting rod is hinged with the half space plate through a rotating shaft, the half space plate has a use state and a folding state, the use state refers to that the half space plate is supported on the cat ladder supporting components, the folding state refers to that the half space plate is positioned on one side of the cat ladder, and the locking handle is used for driving the connecting rod assembly, make the rest platform board down rotate to the user state around the hinge, perhaps make the rest platform board up rotate to the state of packing up around the hinge.
The folding and unfolding of the rest platform plate are controlled by a locking handle on one side of the ladder stand, the locking handle drives a connecting rod assembly to enable the rest platform plate to rotate upwards around a hinge shaft to a folded state, and at the moment, the rest platform plate is located on one side of the ladder stand and is in a vertical state, so that the movement of personnel on the ladder stand is not influenced; or the locking handle drives the connecting rod assembly to enable the rest platform plate to rotate downwards around the hinge shaft to a use state, at the moment, the rest platform plate is supported on the ladder stand supporting assembly to be in a horizontal state, and a stable pedal is provided for personnel needing rest; it is convenient to receive and release, and does not influence workman's cat ladder.
As preferred, be equipped with the direction through-hole that is extension from top to bottom in the axis of rotation, the handle that is locked passes the direction through-hole, upward be equipped with the limiting plate in the mounting panel unit, the limiting plate is located the axis of rotation below, is equipped with on the limiting plate to be used for spacingly the handle through-hole is locked, and when the state was packed up to the rest platform board, the lower extreme that locks the handle inserted in the through-hole. So, when the rest platform board is in the state of packing up, can insert in the through-hole through the handle of being locked to locking the rest platform board and being in the current state, guaranteeing that the rest platform board can not overturn when being in the state of packing up, avoid influencing personnel's activity on the cat ladder, and then guarantee the security of personnel's activity on the cat ladder.
Preferably, the limiting plate is further provided with a waist-shaped hole, and when the resting platform plate is in a retracted state, the lower end of the locking handle is inserted into the waist-shaped hole.
Preferably, the locking handle comprises a handle arranged in the guide through hole in a sliding mode, a flat pad arranged on the handle and located below the guide through hole, and a lock pin arranged at the lower end of the handle and matched with the through hole, wherein a compression spring is sleeved on the handle arranged between the rotating shaft and the flat pad. The compression spring is used to press the handle into the through hole.
Preferably, link assembly still includes the gag lever post that sets up on the upper link, and when the rest platform board was in the state of packing up, the rest platform board supported on the gag lever post. So, be favorable to can help maintaining the rest platform board and be in the state of packing up.
Preferably, the number of the upper connecting rods is two, the two upper connecting rods are parallel, the lower connecting rods correspond to the upper connecting rods one by one, the limiting rod is connected with the two upper connecting rods to be connected into a whole, the upper ends of the two upper connecting rods are connected with the rotating shaft, and the lower end of the lower connecting rod is connected with the rotating shaft. Thus, the connecting rod assembly is designed into a frame structure to be firmer.
Preferably, the ladder stand supporting component comprises two ladder stand supporting units which are symmetrically arranged on two sides of the ladder stand, the two ladder stand supporting units are located at the same height, and one side of the rest platform plate is hinged to one of the ladder stand supporting units through a hinge shaft.
Preferably, the ladder support unit comprises a ladder support arm horizontally arranged, one end of the ladder support arm is connected with the ladder through a bolt, and the ladder support arms of the two ladder support units are parallel.
Preferably, a mounting bracket connected with the ladder stand supporting component is arranged below the rest platform plate, and one side of the rest platform plate is hinged to the mounting bracket through a hinge shaft.
The invention has the beneficial effects that: the connecting rod assembly can be driven to rotate by lifting and rotating the locking handle, so that the rest platform plate is turned to a use state or a folding state, and the rest platform plate is simple and easy to use; the folding and unfolding of the rest platform plate are realized through rotating and connecting the locking handle, the connecting rod assembly and the rest platform plate, and the whole mechanism is simple in design and convenient to install.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the locking and pulling handle of the present invention;
FIG. 3 is a schematic structural view of the connecting rod assembly of the present invention;
FIG. 4 is a schematic structural view of the upper mounting plate unit of the present invention;
FIG. 5 is a schematic structural view of the mounting bracket and resting platform plate of the present invention;
figure 6 is a schematic view of the ladder support unit of the present invention;
fig. 7 is a schematic structural view of the resting platform board of the present invention in a use state and a retracted state (the left figure in the figure is the use state, and the right figure is the retracted state).
In the figure: the locking device comprises a locking handle 1, a connecting rod assembly 2, a resting platform plate 3, a ladder stand supporting assembly 4, a ladder stand supporting unit 41, a ladder stand 5, a rotating shaft 6, an upper mounting plate unit 7, a limiting plate 8, a through hole 9, a kidney-shaped hole 91, a rotating shaft 10, a guide through hole 101, a handle 11, a lock pin 12, a compression spring 13, a flat pad 14, an upper connecting rod 15, a lower connecting rod 151, a limiting rod 16, a ladder stand supporting arm 17, a ladder stand fixing clamp 18, a mounting support 19 and a hinge shaft 20.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
as shown in fig. 1 to 7, the ladder rest platform device for the wind power generation tower comprises a locking handle 1, a connecting rod assembly 2, a rest platform plate 3, a ladder rest support assembly 4 and an upper mounting plate unit 7. The cat ladder supporting component is arranged on two sides of the cat ladder 5, specifically, the cat ladder supporting component 4 comprises two cat ladder supporting units 41 which are symmetrically arranged on two sides of the cat ladder, and the two cat ladder supporting units are positioned at the same height. The upper mounting plate unit 7 is arranged on the ladder and above the ladder support assembly. The locking handle 1 and the connecting rod assembly 2 are arranged on one side of the ladder 5.
One side of the rest platform plate 3 is hinged to a ladder stand supporting component positioned below the rest platform plate through a hinge shaft 20, and specifically, one side of the rest platform plate is hinged to one of the ladder stand supporting units through a hinge shaft. The hinge shaft and the connecting rod assembly are arranged on the same side of the ladder stand.
The connecting-rod assembly 2 includes an upper connecting rod 15 and a lower connecting rod 151 which are hingedly connected. The upper part of the upper connecting rod is rotatably arranged on the upper mounting plate unit through a rotating shaft 10, and the lower part of the lower connecting rod is hinged with the rest platform plate through a rotating shaft 6. In this embodiment, the rotating shaft and the hinge shaft are parallel and horizontally distributed, and the rotating shaft is close to the hinge shaft.
The rest platform board has a use state and a folding state, wherein the use state refers to that the rest platform board is supported on the ladder stand supporting component (as shown in a left figure in fig. 7), and at the moment, the rest platform board is in a horizontal state; the folding state means that the resting platform plate is positioned at one side of the ladder (as shown in the right drawing in fig. 7), and at the moment, the resting platform plate is in a vertical state.
The locking handle is used for driving the connecting rod assembly to enable the rest platform plate 3 to rotate downwards around the hinge shaft 20 to be in a use state, or enable the rest platform plate to rotate upwards around the hinge shaft to be in a retracted state; specifically, be equipped with on the axis of rotation 10 and be the direction through-hole 101 that extends from top to bottom, the handle that is locked passes the direction through-hole, so, can rotate through the handle drive axis of rotation that is locked, and then drive the connecting rod and rotate to drive the rest platform board through lower connecting rod and rotate around the hinge.
The folding and unfolding of the rest platform plate are controlled by a locking handle on one side of the ladder stand, the locking handle drives a connecting rod assembly to enable the rest platform plate to rotate upwards around a hinge shaft to a folded state, and at the moment, the rest platform plate is located on one side of the ladder stand and is in a vertical state, so that the movement of personnel on the ladder stand is not influenced; or the locking handle drives the connecting rod assembly to enable the rest platform plate to rotate downwards around the hinge shaft to a use state, at the moment, the rest platform plate is supported on the ladder stand supporting assembly to be in a horizontal state, and a stable pedal is provided for personnel needing rest; it is convenient to receive and release, and does not influence workman's cat ladder.
Further, as shown in fig. 1, 3 and 7, the connecting rod assembly further includes a limiting rod 16 disposed on the upper connecting rod, as shown in the right drawing of fig. 7, when the resting platform plate is in the retracted state, the resting platform plate abuts against the limiting rod; the state of packing up promptly means that the rest platform board is located one side of cat ladder (as shown in the right side in figure 7), and at this moment, the rest platform board is the state of erectting, and the rest platform board supports on the gag lever post. So, the gag lever post can play the effect of support, spacing rest platform board, is favorable to can helping to maintain the rest platform board and be in the state of packing up.
As shown in fig. 3, there are two upper links 15, and the two upper links are parallel. The number of the lower connecting rods 151 is two, and the lower connecting rods correspond to the upper connecting rods one to one. The limiting rod 16 is connected with the two upper connecting rods as a whole, and in this embodiment, the limiting rods are two upper and two lower. The upper ends of the two upper connecting rods are connected with the rotating shaft, and the lower ends of the lower connecting rods are connected with the rotating shaft. Thus, the connecting rod assembly is designed into a frame structure to be firmer.
In order to make the connecting rod assembly 2 more easily drive the resting platform plate 3 to rotate when rotating, the embodiment improves the lower connecting rod, the upper connecting rod, the limiting rod and the rotating shaft, and specifically, the embodiment is described by taking fig. 7 as an example, so that the upper part of the upper connecting rod inclines towards the ladder stand, and when the upper connecting rod rotates clockwise in a small range, the resting platform plate 3 can be rapidly pushed by the limiting rod 16 to rotate anticlockwise to a horizontal state.
The ladder support unit 41 comprises a horizontally arranged ladder support arm 17 which is perpendicular to the cross bars of the ladder (the ladder comprises two uprights and a plurality of cross bars distributed between the two uprights). Cat ladder support arm one end passes through bolted connection with the cat ladder, and is concrete, and cat ladder support arm one end is realized linking firmly through cat ladder fixation clamp 18 and bolt and the pole setting of cat ladder 5. The ladder support arms of the two ladder support units are parallel.
The rest platform board 3 below is equipped with the installing support 19 of being connected the lateral wall with cat ladder supporting component, and in this embodiment, installing support 19 fixes on the cat ladder support arm. One side of the rest platform plate is hinged on the mounting bracket through a hinge shaft.
Further, as shown in fig. 1, fig. 2 and fig. 7, a limiting plate 8 is arranged in the upper mounting plate unit 7, the limiting plate is located below the rotating shaft, a through hole 9 for the locking handle is arranged on the limiting plate, and when the rest platform plate is in a retracted state, the lower end of the locking handle is inserted into the through hole. So, when the rest platform board is in the state of packing up, can insert in the through-hole through the handle of being locked to locking the rest platform board and being in the current state, guaranteeing that the rest platform board can not overturn when being in the state of packing up, avoid influencing personnel's activity on the cat ladder, and then guarantee the security of personnel's activity on the cat ladder. In this embodiment, when the rest platform board is in the state of packing up, the handle of being locked is vertical distribution.
The limiting plate is further provided with a waist-shaped hole 91, and when the rest platform plate is in a retracted state, the lower end of the locking handle is inserted into the waist-shaped hole.
The locking handle 1 comprises a handle 11 arranged in the guide through hole in a sliding mode, a flat pad 14 arranged on the handle and located below the guide through hole, and a lock pin 12 arranged at the lower end of the handle and used for being matched with the through hole, wherein a compression spring 13 is sleeved on the handle arranged between the rotating shaft and the flat pad. The compression spring is used to press the handle into the through hole.
When the resting platform plate is ready to rotate downwards around the hinge shaft to a use state, the locking handle 1 is lifted up firstly, and the elastic force of the compression spring is overcome, so that the lock pin 12 of the locking handle 1 is separated from the limit of the through hole 9; then, the locking handle drives the connecting rod assembly to enable the rest platform plate to rotate downwards around the hinge shaft to a use state, and at the moment, the rest platform plate is supported on the ladder stand supporting assembly to be in a horizontal state; then, the locking handle is released, so that the locking handle is inserted into the corresponding through hole under the action of the compression spring to be locked.
Similarly, when the resting platform plate is ready to be rotated upwards to a folded state around the hinge shaft, the locking handle 1 is lifted upwards, so that the lock pin 12 of the locking handle 1 is separated from the through hole 9; then, the locking handle drives the connecting rod assembly to enable the rest platform plate to rotate upwards around the hinge shaft to a folded state, and at the moment, the rest platform plate is located on one side of the ladder stand and is in a vertical state, so that the movement of personnel on the ladder stand is not influenced; then, the locking handle is released, so that the locking handle is inserted into the corresponding through hole under the action of the compression spring to be locked.
The invention has simple and easy design, obviously reduces the labor intensity of workers, can be used together with a lifter or a climbing-free device, and can be configured on tower barrels with various specifications.
Claims (9)
1. A wind power generation tower cat ladder rest platform device is characterized by comprising a rest platform plate, cat ladder support components arranged on two sides of the cat ladder, an upper mounting plate unit arranged on the cat ladder and positioned above the cat ladder support components, and a locking handle and a connecting rod assembly arranged on one side of the cat ladder, wherein one side of the rest platform plate is hinged to the cat ladder support components positioned below the rest platform plate through a hinge shaft, the connecting rod assembly comprises an upper connecting rod and a lower connecting rod which are hinged to each other, the upper part of the upper connecting rod is rotatably arranged on the upper mounting plate unit through a rotating shaft, the lower part of the lower connecting rod is hinged to the rest platform plate through a rotating shaft, the rest platform plate has a use state and a folding state, the use state refers to that the rest platform plate is supported on the cat ladder support components, and the rest platform plate is positioned on one side of the cat ladder, the handle of being locked is used for driving link assembly, makes the rest platform board down rotate to the user state around the hinge, perhaps makes the rest platform board up rotate to the state of packing up around the hinge.
2. The ladder rest platform device for the wind power generation tower frame is characterized in that a guide through hole extending up and down is formed in the rotating shaft, the locking handle penetrates through the guide through hole, a limiting plate is arranged in the upper mounting plate unit and located below the rotating shaft, a through hole used for limiting the locking handle is formed in the limiting plate, and when the rest platform plate is in a folded state, the lower end of the locking handle is inserted into the through hole.
3. The ladder rest platform device for the wind power generation tower according to claim 2, wherein the limiting plate is further provided with a waist-shaped hole, and when the rest platform plate is in a folded state, the lower end of the locking handle is inserted into the waist-shaped hole.
4. The ladder rest platform device for the wind power generation tower as claimed in claim 2, wherein the locking handle comprises a handle slidably disposed in the guide through hole, a flat pad disposed on the handle and below the guide through hole, and a locking pin disposed at a lower end of the handle for engaging with the through hole, and a compression spring is sleeved on the handle disposed between the rotating shaft and the flat pad.
5. The wind power tower ladder rest platform device of claim 1, wherein the linkage assembly further comprises a limiting rod disposed on the upper linkage, and when the rest platform plate is in the stowed state, the rest platform plate abuts against the limiting rod.
6. The ladder rest platform device for the wind power generation tower as claimed in claim 5, wherein the number of the upper connecting rods is two, the two upper connecting rods are parallel, the lower connecting rods correspond to the upper connecting rods one by one, the limiting rods are connected with the two upper connecting rods to form a whole, the upper ends of the two upper connecting rods are connected with the rotating shaft, and the lower ends of the lower connecting rods are connected with the rotating shaft.
7. The wind power tower ladder rest platform device according to claim 1, wherein the ladder support assembly comprises two ladder support units symmetrically arranged on two sides of the ladder, the two ladder support units are located at the same height, and one side of the rest platform plate is hinged to one of the ladder support units through a hinge shaft.
8. The wind power tower ladder rest platform device according to claim 7, wherein the ladder support units comprise horizontally arranged ladder support arms, one end of each ladder support arm is connected with a ladder through a bolt, and the ladder support arms of the two ladder support units are parallel.
9. The ladder rest platform device for the wind power generation tower frame as claimed in claim 1, wherein a mounting bracket connected with the ladder support assembly is arranged below the rest platform plate, and one side of the rest platform plate is hinged to the mounting bracket through a hinge shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110719644.6A CN113445898A (en) | 2021-06-28 | 2021-06-28 | Wind power generation pylon cat ladder half space device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110719644.6A CN113445898A (en) | 2021-06-28 | 2021-06-28 | Wind power generation pylon cat ladder half space device |
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| Publication Number | Publication Date |
|---|---|
| CN113445898A true CN113445898A (en) | 2021-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110719644.6A Pending CN113445898A (en) | 2021-06-28 | 2021-06-28 | Wind power generation pylon cat ladder half space device |
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| CN (1) | CN113445898A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2612992A (en) * | 2021-11-18 | 2023-05-24 | Merridian Ltd | Improvements relating to ladder platforms |
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| CN205349222U (en) * | 2015-12-31 | 2016-06-29 | 北京金风科创风电设备有限公司 | A rest footboard and pylon cat ladder for aerogenerator pylon cat ladder |
| CN205577830U (en) * | 2016-01-10 | 2016-09-14 | 中际联合（北京）科技股份有限公司 | Be applied to wind generating set's push -down cat ladder half space |
| CN207701067U (en) * | 2017-12-29 | 2018-08-07 | 北京金风科创风电设备有限公司 | Wind power generating set cat ladder, tower and wind power generating set |
| CN207988924U (en) * | 2018-03-26 | 2018-10-19 | 新疆金风科技股份有限公司 | The pylon ladder rest platform and wind power generating set of wind power generating set |
| CN209494513U (en) * | 2018-09-05 | 2019-10-15 | 中际联合（北京）科技股份有限公司 | A kind of towed revolution half space |
| CN211008431U (en) * | 2019-07-22 | 2020-07-14 | 天津天安机电设备安装工程有限公司 | Vertical ladder with cage |
| CN213116141U (en) * | 2020-07-15 | 2021-05-04 | 天津东景元坤船舶工程有限公司 | A novel aluminum alloy cat ladder for fan tower section of thick bamboo |
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2021
- 2021-06-28 CN CN202110719644.6A patent/CN113445898A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205135397U (en) * | 2015-12-01 | 2016-04-06 | 北京金风科创风电设备有限公司 | Wind generating set pylon cat ladder half space and wind generating set |
| CN205349222U (en) * | 2015-12-31 | 2016-06-29 | 北京金风科创风电设备有限公司 | A rest footboard and pylon cat ladder for aerogenerator pylon cat ladder |
| CN205577830U (en) * | 2016-01-10 | 2016-09-14 | 中际联合（北京）科技股份有限公司 | Be applied to wind generating set's push -down cat ladder half space |
| CN207701067U (en) * | 2017-12-29 | 2018-08-07 | 北京金风科创风电设备有限公司 | Wind power generating set cat ladder, tower and wind power generating set |
| CN207988924U (en) * | 2018-03-26 | 2018-10-19 | 新疆金风科技股份有限公司 | The pylon ladder rest platform and wind power generating set of wind power generating set |
| CN209494513U (en) * | 2018-09-05 | 2019-10-15 | 中际联合（北京）科技股份有限公司 | A kind of towed revolution half space |
| CN211008431U (en) * | 2019-07-22 | 2020-07-14 | 天津天安机电设备安装工程有限公司 | Vertical ladder with cage |
| CN213116141U (en) * | 2020-07-15 | 2021-05-04 | 天津东景元坤船舶工程有限公司 | A novel aluminum alloy cat ladder for fan tower section of thick bamboo |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2612992A (en) * | 2021-11-18 | 2023-05-24 | Merridian Ltd | Improvements relating to ladder platforms |
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