CN111706249A - Maintenance ladder - Google Patents

Maintenance ladder Download PDF

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Publication number
CN111706249A
CN111706249A CN202010513535.4A CN202010513535A CN111706249A CN 111706249 A CN111706249 A CN 111706249A CN 202010513535 A CN202010513535 A CN 202010513535A CN 111706249 A CN111706249 A CN 111706249A
Authority
CN
China
Prior art keywords
platform
guide rail
lower guide
frame
upper guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010513535.4A
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Chinese (zh)
Inventor
黄高峰
刘宏茂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to CN202010513535.4A priority Critical patent/CN111706249A/en
Publication of CN111706249A publication Critical patent/CN111706249A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C9/00Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes
    • E06C9/06Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted
    • E06C9/08Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted with rigid longitudinal members
    • E06C9/12Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted with rigid longitudinal members laterally displaceable
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C7/00Component parts, supporting parts, or accessories
    • E06C7/16Platforms 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 maintenance ladder comprises a frame, a platform, an upper guide wheel, a lower guide wheel and a lifting mechanism, wherein the platform is arranged on the frame, the upper guide wheel and the lower guide wheel are arranged on the frame, and the lifting mechanism is arranged on the frame; the maintenance ladder can simultaneously realize the up-down and left-right movement of the platform.

Description

Maintenance ladder
Technical Field
The invention relates to the field of vacuum equipment maintenance, in particular to a maintenance ladder.
Background
When large-scale vacuum apparatus maintained the maintenance, adopt double ladder or trapezoidal little platform to maintain the maintenance usually, double ladder or trapezoidal little platform are inconvenient to be removed, have very big danger moreover, influence maintaining the maintenance of going on of maintaining efficiency, current maintenance ladder needs the artifical ladder of transport to go the wall side to maintain the maintenance simultaneously, and is very inconvenient, consequently current maintenance ladder has the inconvenient technical problem of operation.
Disclosure of Invention
The embodiment of the invention provides a maintenance ladder, which can relieve the technical problem of inconvenient operation of the existing maintenance ladder.
The embodiment of the invention provides a maintenance ladder, which is used for the maintenance of vacuum equipment and comprises:
a frame;
a platform disposed on the frame; and the number of the first and second groups,
an upper guide wheel and a lower guide wheel arranged on the frame; and the number of the first and second groups,
the lifting mechanism is arranged on the frame;
the vacuum equipment is provided with an upper guide rail and a lower guide rail, the upper guide rail is in contact with the upper guide wheel, the lower guide rail is in contact with the lower guide wheel, the left and right movement of the platform is realized through the upper guide rail and the lower guide rail, and the up and down movement of the platform is realized through the lifting mechanism.
In the maintenance ladder provided by the embodiment of the invention, the maintenance ladder further comprises pedals, the pedals are in contact with the edge of the platform through the rotating shaft, and the pedals can be put down or put back along the rotating shaft.
In the service ladder provided by the embodiment of the invention, the platform comprises a buckle component, and when the pedal is folded, the buckle component is used for clamping the pedal on the platform.
In the maintenance ladder provided by the embodiment of the invention, the platform further comprises at least two hinges, the two hinges are respectively contacted with two sides of the pedal, when the pedal is put down, the hinges are tightened, and the hinges are used for bearing partial weight of the pedal and personnel above the pedal for maintenance.
In the maintenance ladder provided by the embodiment of the invention, the lifting mechanism comprises a control assembly and a transmission assembly, the control assembly is used for controlling the platform to move up and down, and the transmission assembly is used for amplifying the power of the control assembly and then transmitting the power to the platform to drive the platform to move up and down.
In the maintenance ladder provided by the embodiment of the invention, the transmission component is a hinge or a pulley, and the control component is a swinging handle.
In the maintenance ladder provided by the embodiment of the invention, the lifting mechanism comprises a fixing component, and the fixing component is used for fixing the platform after the platform moves up and down.
In the maintenance ladder provided by the embodiment of the invention, the upper guide rail is arranged on the upper side of the vacuum equipment, the lower guide rail is arranged on the lower side of the vacuum equipment, and the upper guide wheel and the lower guide wheel are arranged on the frame.
In a service ladder provided by an embodiment of the invention, the frame comprises a fence arranged around the platform.
In the maintenance ladder provided by the embodiment of the invention, the width of the pedal ranges from any value between 330 mm and 600 mm.
Has the advantages that: the maintenance ladder provided by the embodiment of the invention comprises a frame, a platform, an upper guide wheel, a lower guide wheel and a lifting mechanism, wherein the platform is arranged on the frame, the upper guide wheel and the lower guide wheel are arranged on the frame, the lifting mechanism is arranged on the frame, an upper guide rail and a lower guide rail are arranged on vacuum equipment, the upper guide rail is in contact with the upper guide wheel, the lower guide rail is in contact with the lower guide wheel, the left and right movement of the platform is realized through the upper guide rail and the lower guide rail, and the up and down movement of the platform is realized through the lifting mechanism; the upper guide rail is in contact with the upper guide wheel, the lower guide rail is in contact with the lower guide wheel, the left and right movement of the platform can be realized, and the up and down movement of the platform is realized through the lifting mechanism.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic side view of a service ladder according to an embodiment of the present invention;
fig. 2 is a schematic front view of a maintenance ladder according to an embodiment of the present invention;
fig. 3 is a schematic top view of a platform and a step of a maintenance ladder according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
As shown in fig. 1 and 2, the maintenance ladder according to the embodiment of the present invention includes a frame 10, a platform 20, an upper guide wheel 1001, a lower guide wheel 1002, and a lifting mechanism 30, wherein the platform 20 is disposed on the frame 10, and the upper guide wheel 1001 and the lower guide wheel 1002 are disposed on the frame 10, and the lifting mechanism 30 is disposed on the frame 10, wherein an upper guide rail 2001 and a lower guide rail 2002 are disposed on the vacuum apparatus, the upper guide rail 2001 contacts with the upper guide wheel 1001, the lower guide rail 2002 contacts with the lower guide wheel 1002, the upper guide rail 2001 and the lower guide rail 2002 realize the left-right movement of the platform 20, and the lifting mechanism 30 realizes the up-down movement of the platform 20.
In this embodiment, the maintenance ladder includes a frame 10, a platform 20, an upper guide wheel 1001, a lower guide wheel 1002, and a lifting mechanism 30, wherein the platform 20 is disposed on the frame 10, and the upper guide wheel 1001 and the lower guide wheel 1002 are disposed on the frame 10, and the lifting mechanism 30 is disposed on the frame 10, wherein an upper guide rail 2001 and a lower guide rail 2002 are disposed on the vacuum apparatus, the upper guide rail 2001 is in contact with the upper guide wheel 1001, the lower guide rail 2002 is in contact with the lower guide wheel 1002, the upper guide rail 2001 and the lower guide rail 2002 realize the left and right movement of the platform 20, and the lifting mechanism 30 realizes the up and down movement of the platform 20; the upper guide rail 2001 and the upper guide wheel 1001 are in contact with each other, and the lower guide rail 2002 and the lower guide wheel 1002 are in contact with each other, so that the platform 20 can move left and right, and the platform 20 can move up and down by the lifting mechanism 30.
Wherein, still include the rail that sets up around the maintenance ladder frame.
The upper guide rail 2001 and the upper guide wheel 1001 are in contact with each other, and the lower guide rail 2002 and the lower guide wheel 1002 are in contact with each other, so that the platform 20 can move left and right along the directions of the upper guide rail 2001 and the lower guide rail 2002.
Wherein, the platform 20 can be moved up and down by the elevating mechanism 30.
In one embodiment, the service ladder is arranged on a vacuum apparatus comprising a door side and a wall side, the door side being provided with a barrier outside for normal operation of the vacuum apparatus.
In one embodiment, the service ladder further comprises a step 40, the step 40 is contacted with the edge of the platform 20 through a rotating shaft 401, and the step 40 can be put down or put up along the rotating shaft 401.
Wherein, the pedal 40 is used for extending to the vicinity of the wall side of the vacuum equipment and carrying out maintenance on the wall side.
When the pedal 40 is retracted, a plurality of obstacles are arranged near the door side of the vacuum equipment, and the platform 20 can move left and right along the upper guide rail 2001 and the lower guide rail 2002, so that the pedal 40 is prevented from being blocked by the obstacles.
When the vacuum equipment moves to an area needing maintenance, the pedal 40 is put down, the pedal 40 extends into the vacuum equipment, and the wall side of the vacuum equipment can be maintained.
In this embodiment, the step 40 is provided to allow a person to enter the wall side of the vacuum apparatus for maintenance, and the step 40 is prepared to be retractable, and the service ladder is not obstructed by the door side obstacle, and is movable left and right along the upper guide rail 2001 and the lower guide rail 2002.
In one embodiment, as shown in FIG. 3, the platform 20 includes snap members 402, the snap members 402 being used to snap the deck 40 onto the platform 20 when the deck 40 is stowed.
When the maintenance ladder needs to be moved left and right, the pedal 40 is engaged with the platform 20 via the engaging member 402.
Wherein when it is desired to lower the pedal 40, the snap member 402 is released for manual lowering.
In this embodiment, the latch member 402 can prevent the pedal 40 from rotating during the movement, the latch member 402 can latch the pedal 40 on the platform 20, and when the pedal 40 needs to be used, the latch member 402 can be released to lower the pedal 40.
In one embodiment, the platform 20 further comprises at least two hinges 403, the two hinges 403 are respectively in contact with two sides of the step 40, when the step 40 is put down, the hinges 403 are tightened, and the hinges 403 are used for bearing part of the weight of the step 40 and the person performing maintenance thereon.
Wherein the hinge 403 comprises a first hinge 403 and a second hinge 403, the first hinge 403 connects the left edge of the step 40, and the second hinge 403 connects the right edge of the step 40.
Wherein the step 40 is manually pulled up by pulling the hinge 403, and then the step 40 is snapped onto the platform 20 by the snap member 402.
When a person performs maintenance on the wall side through the step 40, the hinge 403 can bear a part of the weight of the person, and the step 40 is prevented from collapsing.
In this embodiment, the two hinges 403 are generally symmetrically disposed on two sides of the step plate 40, the other end of the hinge 403 is connected to the platform 20, when the step plate 40 needs to be retracted, the hinge 403 can be pulled by manpower to drive the step plate 40 to be retracted, and when the step plate 40 needs to be lowered to perform maintenance on the wall side, the hinge 403 plays a role in sharing weight and ensuring safety of people.
In one embodiment, the lifting mechanism 30 includes a control component for controlling the platform 20 to move up and down, and a transmission component for transmitting the power of the control component to the platform 20 after amplifying, so as to drive the platform 20 to move up and down.
Wherein, the control assembly can be a handle, and the platform 20 is driven to move up and down by manually applying a force to the handle.
Wherein, the control component can also be a button, and can be configured as an automatic lifting mechanism 30, and the automatic lifting mechanism 30 at least comprises a sensor and an amplifier.
Wherein the transmission component may be a hinge 403.
Wherein, the transmission component can also be a pulley.
In this embodiment, the transmission assembly utilizes the lever principle, amplifies the force transmitted from the control assembly and then acts on the platform 20, and the transmission assembly is in contact with the platform 20.
In one embodiment, the transmission component is a hinge 403 or a pulley and the control component is a swingable handle.
In one embodiment, the lifting mechanism 30 includes a fixing assembly for fixing the platform 20 after moving the platform 20 up and down.
When the platform 20 is moved up and down to the position to be maintained by the lifting mechanism 30, the platform 20 is fixed by the fixing component and then maintained.
In one embodiment, the upper guide rail 2001 is disposed at an upper side of the vacuum apparatus, the lower guide rail 2002 is disposed at a lower side of the vacuum apparatus, and the upper guide wheel 1001 and the lower guide wheel 1002 are disposed on the frame 10.
In one embodiment, the frame 10 includes a fence disposed about the platform 20.
In one embodiment, the rail is arcuate in cross-sectional shape.
In one embodiment, the fence is rectangular or trapezoidal in cross-sectional shape.
In one embodiment, the frame further comprises an escalator connecting the platform 20 and the bottom of the frame 10.
Wherein the enclosure may also be disposed around the escalator.
Wherein the rail may also be disposed around the step 40.
In this embodiment, the purpose of the enclosure is to protect the safety of maintenance personnel.
In one embodiment, the frame 10 includes four pulleys disposed at four corners of the bottom of the frame 10, and the pulleys are used for moving the frame 10 to the left and right along the upper guide rail 2001 and the lower guide rail 2002.
In one embodiment, the width of the foot plate 40 ranges anywhere from 330 mm to 600 mm.
Wherein, the pedal 40 is 330 mm at least, and 330 mm is the safe width of people standing on the pedal 40.
The maximum width 600 is the width of the door side, which is usually about 600 mm at present, because the pedal 40 needs to extend into the vacuum equipment for wall side maintenance, and the width cannot be larger than the width of the door side of the vacuum equipment.
In one embodiment, the width of the tread 40 is 330 mm.
In this embodiment, the preparation material of the pedal 40 is minimum, and the maintenance of the wall side of the vacuum apparatus by using the pedal 40 is realized on the premise of a safe width.
In one embodiment, the width of the deck 40 from the wall side ranges anywhere from 368 millimeters to 468 millimeters.
In one embodiment, the width of the deck 40 from the wall side is 418 millimeters.
In one embodiment, the pulley is provided with a fixed block, the fixed block is arranged on the front side and the rear side of the pulley in a direction perpendicular to the lower guide rail 2002, when the pulley drives the lower guide wheel 1002 to move left and right along the lower guide rail 2002, the fixed block is not in contact with the pulley, the pulley is slidable, when the pulley is arranged perpendicular to the lower guide rail 2002, the outer wall of the pulley is in contact with the fixed block, and the pulley cannot move.
Wherein, the preparation material of the fixed block can have certain elastic deformation property.
Wherein, the fixed block can only be provided with one.
Wherein, the fixed block also can be provided with two blocks.
In one embodiment, a mechanism with a clamping function is arranged at the pulley and used for clamping the pulley when the pulley is not required to move left and right, so that the abnormal movement of the maintenance ladder is prevented when maintenance is carried out.
The maintenance ladder provided by the embodiment of the invention comprises a frame, a platform, an upper guide wheel, a lower guide wheel and a lifting mechanism, wherein the platform is arranged on the frame, the upper guide wheel and the lower guide wheel are arranged on the frame, the lifting mechanism is arranged on the frame, an upper guide rail and a lower guide rail are arranged on vacuum equipment, the upper guide rail is in contact with the upper guide wheel, the lower guide rail is in contact with the lower guide wheel, the left and right movement of the platform is realized through the upper guide rail and the lower guide rail, and the up and down movement of the platform is realized through the lifting mechanism; the upper guide rail is in contact with the upper guide wheel, the lower guide rail is in contact with the lower guide wheel, the left and right movement of the platform can be realized, and the up and down movement of the platform is realized through the lifting mechanism.
The foregoing detailed description is provided for one of the embodiments of the present invention, and the principle and the implementation of the present invention are explained herein by applying specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A service ladder for maintenance of vacuum equipment, comprising:
a frame;
a platform disposed on the frame; and the number of the first and second groups,
an upper guide wheel and a lower guide wheel arranged on the frame; and the number of the first and second groups,
the lifting mechanism is arranged on the frame;
the upper guide rail is arranged on the upper portion of the vacuum equipment, the lower guide rail is arranged on the lower portion of the vacuum equipment, the upper guide rail is in contact with the upper guide wheel, the lower guide rail is in contact with the lower guide wheel, the left and right movement of the platform is achieved through the upper guide rail and the lower guide rail, and the up and down movement of the platform is achieved through the lifting mechanism.
2. The service ladder of claim 1, further comprising a step that contacts the platform edge via a pivot axis, the step being retractable along the pivot axis.
3. The service ladder of claim 2, wherein the platform includes a snap-fit member for snapping the step onto the platform when the step is retracted.
4. The ladder of claim 3, wherein the platform further includes at least two hinges, each of the two hinges contacting a respective side of the step, the hinges being tensioned when the step is lowered, the hinges being adapted to bear a portion of the weight of the step and a person performing maintenance thereon.
5. The ladder of claim 2, wherein the lifting mechanism includes a control assembly for controlling the platform to move up and down and a transmission assembly for transmitting power from the control assembly to the platform after amplification to move the platform up and down.
6. The service ladder of claim 5, wherein the drive assembly is a hinge or a pulley and the control assembly is a swingable handle.
7. The service ladder of claim 1, wherein the lift mechanism includes a securing assembly for securing the platform after moving the platform up and down.
8. The service ladder of claim 1, wherein the upper guide rail is disposed on an upper side of the vacuum apparatus, the lower guide rail is disposed on a lower side of the vacuum apparatus, and the upper guide roller and the lower guide roller are disposed on the frame.
9. The service ladder of claim 1, wherein the frame includes a fence disposed around the platform.
10. The service ladder of claim 1, wherein the step width ranges anywhere from 330 mm to 600 mm.
CN202010513535.4A 2020-06-08 2020-06-08 Maintenance ladder Pending CN111706249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010513535.4A CN111706249A (en) 2020-06-08 2020-06-08 Maintenance ladder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010513535.4A CN111706249A (en) 2020-06-08 2020-06-08 Maintenance ladder

Publications (1)

Publication Number Publication Date
CN111706249A true CN111706249A (en) 2020-09-25

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CN202010513535.4A Pending CN111706249A (en) 2020-06-08 2020-06-08 Maintenance ladder

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2926392Y (en) * 2006-07-21 2007-07-25 中国石油天然气管道局第三工程分公司 Elevator for storage tank exteral-wall construction
CN201610631U (en) * 2009-12-16 2010-10-20 中煤第三建设(集团)有限责任公司 Traction and movable type lifting platform for construction
CN202333536U (en) * 2011-11-28 2012-07-11 成都槟果科技有限公司 Maintenance workbench
CN103352559A (en) * 2013-07-18 2013-10-16 江维安 Hanging type movable working platform for storage tank maintenance
CN203767437U (en) * 2013-12-28 2014-08-13 浙江杭可科技有限公司 Novel two-freedom elevator
CN104453201A (en) * 2013-09-16 2015-03-25 深圳市特辰科技股份有限公司 Automatic ascending and descending type material platform
CN105751920A (en) * 2016-03-02 2016-07-13 湖南华铝机械技术有限公司 Intelligent multifunctional overhead contact system operation tower wagon
CN110700548A (en) * 2019-10-25 2020-01-17 中国一冶集团有限公司 Assembled multi-section track hanger device and operation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2926392Y (en) * 2006-07-21 2007-07-25 中国石油天然气管道局第三工程分公司 Elevator for storage tank exteral-wall construction
CN201610631U (en) * 2009-12-16 2010-10-20 中煤第三建设(集团)有限责任公司 Traction and movable type lifting platform for construction
CN202333536U (en) * 2011-11-28 2012-07-11 成都槟果科技有限公司 Maintenance workbench
CN103352559A (en) * 2013-07-18 2013-10-16 江维安 Hanging type movable working platform for storage tank maintenance
CN104453201A (en) * 2013-09-16 2015-03-25 深圳市特辰科技股份有限公司 Automatic ascending and descending type material platform
CN203767437U (en) * 2013-12-28 2014-08-13 浙江杭可科技有限公司 Novel two-freedom elevator
CN105751920A (en) * 2016-03-02 2016-07-13 湖南华铝机械技术有限公司 Intelligent multifunctional overhead contact system operation tower wagon
CN110700548A (en) * 2019-10-25 2020-01-17 中国一冶集团有限公司 Assembled multi-section track hanger device and operation method thereof

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Application publication date: 20200925

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