CN114876171A - A adjustable construction platform for construction is built in room - Google Patents
A adjustable construction platform for construction is built in room Download PDFInfo
- Publication number
- CN114876171A CN114876171A CN202210736000.2A CN202210736000A CN114876171A CN 114876171 A CN114876171 A CN 114876171A CN 202210736000 A CN202210736000 A CN 202210736000A CN 114876171 A CN114876171 A CN 114876171A
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- China
- Prior art keywords
- platform
- construction
- load wheel
- support column
- moving platform
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- 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.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/18—Scaffolds primarily resting on the ground adjustable in height
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/15—Scaffolds primarily resting on the ground essentially comprising special means for supporting or forming platforms; Platforms
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/02—Scaffold feet, e.g. with arrangements for adjustment
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/14—Railings
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Platform Screen Doors And Railroad Systems (AREA)
Abstract
The invention relates to an adjustable construction platform for building construction, and belongs to the technical field of building construction. The construction platform comprises a base, a C-shaped support column and a mobile platform; the base on vertically install two piece at least C shape support columns, rotate on the moving platform lateral wall and install the load wheel that is located the C shape inslot of C shape support column, the load wheel passes through drive mechanism and is connected with the motor of installing in the moving platform bottom, the load wheel is connected soon with C shape support column screw thread and is realized moving platform's reciprocating. According to the invention, the C-shaped support column is adopted to support the mobile platform, the load wheel screwed with the C-shaped support column is rotatably mounted on the mobile platform, and the motor drives the load wheel to rotate, so that the mobile platform is driven to move up and down, the height adjustment of the mobile platform is realized, the construction platform can meet the requirement of workers on construction and use at different heights, the applicability of the construction platform is effectively improved, and the use is more convenient.
Description
Technical Field
The invention belongs to the technical field of house construction, and particularly relates to an adjustable construction platform for house construction.
Background
In the building construction process, when needing to be under construction to the top in house or higher position, workman need build the scaffold frame usually and carry out the lifting of position to carry out the construction operation to higher position. The overall height of the built scaffold is relatively fixed, but in the process of building construction, construction operation is generally required to be carried out on positions with different heights of a building, and the height requirements of workers with different heights on the scaffold are different, so that the scaffold can only be heightened or built from time to time according to different construction heights, the efficiency is relatively low, and the labor intensity of the workers is relatively high.
Disclosure of Invention
In order to solve the problems, the invention provides an adjustable construction platform for house building construction. The height of the construction platform can be adjusted according to needs, the applicability is wider, and the use is more convenient.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
an adjustable construction platform for building construction is disclosed, the construction platform comprises a base, a C-shaped support column and a mobile platform; the base on vertically install two piece at least C shape support columns, rotate on the moving platform lateral wall and install the load wheel that is located the C shape inslot of C shape support column, the load wheel passes through drive mechanism and is connected with the motor of installing in the moving platform bottom, the load wheel is connected soon with C shape support column screw thread and is realized moving platform's reciprocating.
Preferably, four C-shaped support columns are arranged, the periphery of the mobile platform is distributed in a rectangular mode, and the C-shaped support columns are connected into a whole through connecting rods.
Preferably, the upper end and the lower end of the C-shaped support column are respectively provided with a connecting sheet, and the connecting sheets are provided with connecting holes.
Preferably, the motor is a stepping motor or a servo motor, and each load wheel is driven to rotate by one motor.
Preferably, the load wheel is installed on the side wall of the mobile platform through a rotating shaft, a turbine located below the load wheel is arranged on the rotating shaft, and the motor is in transmission connection with the turbine through a worm.
Furthermore, a boss is arranged on the side wall of the moving platform, a pull rod is hinged to the boss, two locking rods are hinged to the bottom of the boss, the two locking rods are driven to rotate laterally through springs respectively, the bottom end of the pull rod is connected with the two locking rods through steel ropes, and when the pull rod is rotated, the two locking rods are driven to approach each other; and the connecting rod is vertically provided with positioning rods which are positioned at two sides of the lug boss and matched with the locking rod to lock the mobile platform.
Preferably, the lower end of the pull rod is connected with one end of the steel rope, and the other end of the steel rope penetrates through one locking rod and then is connected with the other locking rod.
Preferably, the lower end of the pull rod is connected with the two locking rods through a steel rope respectively.
Furthermore, the moving platform is provided with a fence, and the fence is provided with a door.
Preferably, the door is hinged to the moving platform, a connecting column is arranged behind the door and hinged to one end of the electric telescopic rod, and the other end of the electric telescopic rod is hinged to the door.
The invention has the beneficial effects that:
according to the invention, the C-shaped support column is adopted to support the mobile platform, the load wheel screwed with the C-shaped support column is rotatably mounted on the mobile platform, and the motor drives the load wheel to rotate, so that the mobile platform is driven to move up and down, the height adjustment of the mobile platform is realized, the construction platform can meet the requirement of workers on construction and use at different heights, the applicability of the construction platform is effectively improved, and the use is more convenient.
Drawings
FIG. 1 is a schematic left side view of the present invention;
FIG. 2 is a schematic perspective view of a C-shaped support post according to the present invention;
FIG. 3 is a schematic top view of the present invention;
FIG. 4 is an enlarged view taken at A of FIG. 2 in accordance with the present invention;
FIG. 5 is a schematic view of the load wheel installation of the present invention;
FIG. 6 is a schematic view of the tie rod installation of the present invention;
FIG. 7 is a schematic perspective view of a mobile platform according to the present invention;
in the figure, 1-base, 2-C-shaped supporting column, 3-moving platform, 4-loading wheel, 5-motor, 6-connecting rod, 7-connecting piece, 8-rotating shaft, 9-turbine, 10-worm, 11-locating rod, 12-boss, 13-locking rod, 14-pull rod, 15-steel rope, 16-fence, 17-door, 18-connecting column and 19-electric telescopic rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding of the skilled person.
As shown in the figure, the adjustable construction platform for building construction comprises a base 1, a C-shaped support column 2 and a mobile platform 3; at least two C-shaped support columns 2 are vertically arranged on the base 1, a load wheel 4 positioned in a C-shaped groove of each C-shaped support column 2 is rotatably arranged on the side wall of the mobile platform 3, the load wheel 4 is connected with a motor 5 arranged at the bottom of the mobile platform 3 through a transmission mechanism, and the load wheel 4 is screwed with the C-shaped support columns 2 in a threaded manner to realize the up-and-down movement of the mobile platform 3; the movable platform 3 is a working activity area of workers and adopts a square plate surface structure or a structure that steel plates are laid on a square supporting steel frame; when two C-shaped support columns 2 are arranged, the two C-shaped support columns 2 are symmetrically arranged on two sides of the mobile platform 3, and the mobile platform 3 is stably supported from two sides; as the optimal design, C shape support column 2 be provided with four, be rectangular distribution around moving platform 3, moving platform 3 atress is more even, has guaranteed that moving platform 3 can not appear the slope problem in the in-process that reciprocates, has effectively improved moving platform 3's stability can. The four C-shaped supporting columns 2 are connected into a whole through the connecting rods 6, a stable frame structure is formed, the stability is higher, and the supporting performance of the C-shaped supporting columns 2 is effectively improved. When the load platform moves, the motor 5 is electrified to rotate to provide power, the load wheel 4 is driven to rotate through the transmission mechanism, the load wheel 4 moves up and down in the C-shaped support column 2, the mobile platform 3 is driven to move up and down, the purpose of adjusting the height of the position of the mobile platform 3 is achieved, the construction platform can meet the requirement of workers for construction and use under different heights, the applicability of the construction platform is effectively improved, and the use is more convenient.
Preferably, the upper end and the lower end of the C-shaped support column 2 are respectively provided with a connecting sheet 7, the connecting sheets 7 are provided with connecting holes, when the C-shaped support column 2 is installed, the C-shaped support column 2 is placed on the base 1, and then a screw penetrates through the connecting holes and is screwed with the base 1, so that the C-shaped support column 2 is more convenient to install and disassemble; when the higher construction height of needs, can stack C shape support column 2, then connect as an organic wholely through connection piece 7, C shape support column 2 internal thread also just in time connects as an organic wholely, effectively prolongs the height that moving platform 3 can be lifted, and it is more convenient to use, effectively reduces the length of single C shape support column 2, and it is more convenient that construction platform deposits and transports.
In the invention, the motors 5 adopt stepping motors or servo motors, each load wheel 4 is driven to rotate by one motor 5, the four motors 5 are uniformly and coordinately controlled by an external controller, the horizontal ascending or descending of the mobile platform 3 is effectively ensured, in order to ensure the horizontal movement of the platform, a horizontal sensor can be additionally arranged on the mobile platform 3, the levelness of the mobile platform 3 is detected by the horizontal sensor and then transmitted to the controller, the controller is used for controlling the four motors 5 to rotate respectively, the heights of the four corners of the mobile platform 3 are finely adjusted, the mobile platform 3 is ensured to be always in a horizontal state, and workers can walk on the mobile platform 3 more safely. Preferably, the load wheel 4 is installed on the side wall of the moving platform 3 through a rotating shaft 8, so that the load wheel 4 is rotatably connected with the moving platform 3, a worm wheel 9 positioned below the load wheel 4 is arranged on the rotating shaft 8, the motor 5 is in transmission connection with the worm wheel 9 through a worm 10, and the self-locking characteristic of the worm wheel 9 and the worm 10 is utilized, so that the moving platform 3 is effectively prevented from sliding downwards under the condition of a load, the load of the motor 5 when the moving platform 3 is static is reduced, and the service life of the motor 5 is effectively prolonged.
In the invention, a boss 12 is arranged on the side wall of the moving platform 3, a pull rod 14 is hinged on the boss 12, two locking rods 13 are hinged at the bottom of the boss 12, the two locking rods 13 are driven by springs to rotate laterally respectively, the bottom end of the pull rod 14 is connected with the two locking rods 13 through a steel rope 15, and when the pull rod 14 is rotated, the two locking rods 13 are driven to approach each other; the connecting rod 6 is vertically provided with positioning rods 11 which are positioned at two sides of the boss 12 and are matched with the locking rod 13 to lock the movable platform 3; the length of locating lever 11 is unanimous with the length of C shape support column 2, when stacking C shape support column 2, locating lever 11 is the corresponding extension that stacks also, the spring mounting is on the articulated shaft of check lock lever 13, two check lock levers 13 rotate to side and are a splayed, the lower extreme of check lock lever 13 supports on the medial surface of locating lever 11, make check lock lever 13 be connected with locating lever 11 formation, thereby lock moving platform 3 position, prevent effectively that moving platform 3 from falling when static accident, workman's safety on moving platform 3 has effectively been guaranteed, the security that the construction platform who effectively improves used. When two check lock levers 13 are pressed, the force that the outside side of part was opened can be divided to pressurized pressure, thereby make check lock lever 13 combine inseparabler with locating lever 11, the check lock lever 13 problem of skidding has been avoided, it is safer to use, for improving the friction of check lock lever 13 and locating lever 11, be provided with the arch on the medial surface of locating lever 11, be equipped with on the free terminal surface of check lock lever 13 with protruding assorted recess, the problem of skidding has further been prevented to locating lever 11 and check lock lever 13 emergence. When the mobile platform 3 needs to move up and down to adjust the position, the pull rod 14 is rotated to drive the two locking rods 13 to approach each other, so that the locking rods 13 are separated from the positioning rods 11, and the mobile platform 3 can normally move up and down.
Preferably, the lower end of the pull rod 14 is connected with one end of the steel rope 15, the other end of the steel rope 15 penetrates through one of the locking rods 13 and then is connected with the other locking rod 13, at this time, the pull rod 14 can swing back and forth, when the two locking rods 13 rotate respectively in the direction of closing each other, only a certain angle can be rotated, and when the pull rod 14 is rotated, the two locking rods 13 are pulled to close each other through the steel rope 15.
Preferably, the lower end of the pull rod 14 is connected to the two locking rods 13 through a steel cable 15, and at this time, the pull rod 14 can swing left and right, that is, the lower end of the pull rod 14 can move in a direction away from the locking rods 13, so that the two locking rods 13 are pulled to approach each other through the steel cable 15.
In the invention, the moving platform 3 is provided with the fence 16, so that workers are effectively prevented from sliding off the moving platform 3, the use safety of the construction platform is improved, the fence 16 is provided with the door 17, and the door 17 is arranged on the front side surface of the moving platform 3 and is used for the workers to pass through the moving platform 3. Preferably, the bottom of the door 17 is hinged to the moving platform 3, so that the door 17 is firmly connected with the moving platform 3, a connecting column 18 is arranged behind the door 17, the connecting column 18 is hinged to one end of an electric telescopic rod 19, the other end of the electric telescopic rod 19 is hinged to the door 17, when the electric telescopic rod 19 extends, the door 17 rotates towards the front side of the moving platform 3, when the moving platform 3 moves to the lowest position, the upper end of the door 17 falls down to be in contact with the ground, the lower end of the door 17 is connected with the moving platform 3, a slope is formed between the moving platform 3 and the ground, a worker can conveniently enter the moving platform 3, meanwhile, the worker can push tools such as a trolley and a plate trolley onto the moving platform 3, and the labor intensity of the worker is effectively reduced. Preferably, the universal wheels with a self-locking function are arranged below the base 1, so that a worker can conveniently move the construction platform.
The use process of the invention is as follows:
during the use, with base 1 removal to relevant position, then place moving platform 3 and C shape support column 2 on base 1 in proper order to with the C shape inslot of load wheel 4 screw in C shape support column 2, adopt the bolt to pass behind the connecting hole on the connection piece 7 with base 1 screw thread revolve and connect base 1 and C shape support column 2 firm in connection. When the length of the C-shaped supporting column 2 is not enough to meet the use requirement, the other C-shaped supporting columns 2 are stacked on the top ends of the C-shaped supporting columns 2 at the bottom layer, the two C-shaped supporting columns 2 are firmly connected through bolts, and the whole height of the supporting columns is prolonged. When a worker enters the mobile platform 3, the electric telescopic rod 9 extends to lay down the door 17, a slope is formed between the ground and the mobile platform 3, and after the worker enters the mobile platform 3, the electric telescopic rod 9 is shortened to close the door 17; when the height of the mobile platform 3 needs to be adjusted, a worker firstly pulls the pull rod 14 to rotate, the two locking rods 13 are mutually closed through the steel rope 15, the locking rods 13 and the positioning rod 11 are mutually separated and unlocked, then the motor 5 is electrified to rotate, and the load wheel 4 is driven to rotate through the worm wheel 9 and the worm 10, so that the whole mobile platform 3 is driven to horizontally rise or fall; after the mobile platform 3 moves to a required position, the motor 5 stops rotating, a worker pulls the pull rod 14 to rotate, the pull rod 14 releases the locking rod 13 through the steel rope 15, the lower end of the locking rod 13 rotates towards the positioning rod 11 under the driving of the spring until the locking rod abuts against the positioning rod 11, and therefore the position of the mobile platform 3 is locked.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, while the invention has been described in detail with reference to the foregoing preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims; the size of the attached figure is irrelevant to the specific real object, and the size of the real object can be changed at will.
Claims (10)
1. The utility model provides an adjustable construction platform for construction is built in room which characterized in that: the construction platform comprises a base (1), a C-shaped support column (2) and a movable platform (3); base (1) on vertically install two piece at least C shape support columns (2), rotate on the moving platform (3) lateral wall and install load wheel (4) that are located C shape support column (2) C inslot, load wheel (4) are connected with motor (5) of installing in moving platform (3) bottom through drive mechanism, load wheel (4) connect soon with C shape support column (2) screw thread and realize reciprocating of moving platform (3).
2. The adjustable construction platform for building construction according to claim 1, wherein: the four C-shaped supporting columns (2) are arranged, the periphery of the moving platform (3) is distributed in a rectangular mode, and the C-shaped supporting columns (2) are connected into a whole through the connecting rod (6).
3. The adjustable construction platform for building construction according to claim 2, wherein: the upper end and the lower end of the C-shaped support column (2) are respectively provided with a connecting sheet (7), and the connecting sheet (7) is provided with a connecting hole.
4. An adjustable construction platform for building construction according to claim 1, 2 or 3, wherein: the motor (5) adopts a stepping motor or a servo motor, and each load wheel (4) is driven to rotate by one motor (5).
5. The adjustable construction platform for building construction according to claim 4, wherein: load wheel (4) install on moving platform (3) lateral wall through pivot (8), be equipped with turbine (9) that are located load wheel (4) below on pivot (8), motor (5) are connected with turbine (9) transmission through worm (10).
6. The adjustable construction platform for building construction according to claim 2, wherein: the side wall of the moving platform (3) is provided with a boss (12), a pull rod (14) is hinged on the boss (12), the bottom of the boss (12) is hinged with two locking rods (13), the two locking rods (13) are driven by springs to rotate towards the side respectively, the bottom end of the pull rod (14) is connected with the two locking rods (13) through a steel rope (15), and when the pull rod (14) is rotated, the two locking rods (13) are driven to approach each other; and the connecting rod (6) is vertically provided with positioning rods (11) which are positioned at two sides of the boss (12) and are matched with the locking rod (13) to lock the movable platform (3).
7. The adjustable construction platform for building construction according to claim 6, wherein: the lower end of the pull rod (14) is connected with one end of the steel rope (15), and the other end of the steel rope (15) penetrates through one locking rod (13) and then is connected with the other locking rod (13).
8. The adjustable construction platform for building construction according to claim 6, wherein: the lower end of the pull rod (14) is respectively connected with the two locking rods (13) through a steel rope (15).
9. An adjustable construction platform for building construction according to claim 7 or 8, wherein: the moving platform (3) is provided with a fence (16), and the fence (16) is provided with a door (17).
10. The adjustable construction platform for building construction according to claim 9, wherein: the door (17) is hinged to the moving platform (3), a connecting column (18) is arranged behind the door (17), the connecting column (18) is hinged to one end of an electric telescopic rod (19), and the other end of the electric telescopic rod (19) is hinged to the door (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210736000.2A CN114876171A (en) | 2022-06-27 | 2022-06-27 | A adjustable construction platform for construction is built in room |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210736000.2A CN114876171A (en) | 2022-06-27 | 2022-06-27 | A adjustable construction platform for construction is built in room |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114876171A true CN114876171A (en) | 2022-08-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210736000.2A Pending CN114876171A (en) | 2022-06-27 | 2022-06-27 | A adjustable construction platform for construction is built in room |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114876171A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050056488A1 (en) * | 2003-09-11 | 2005-03-17 | Nathaniel Hairston | Buddy's adjustable height workhorse |
| CN203514290U (en) * | 2013-10-16 | 2014-04-02 | 中国石油大学(华东) | Novel self-elevating drilling platform hoisting mechanism |
| CN104340925A (en) * | 2013-07-24 | 2015-02-11 | 青岛德盛利汽车检测设备有限公司 | Locking device capable of being unlocked itself of scissor lift |
| CN110171791A (en) * | 2019-06-04 | 2019-08-27 | 长沙望轶机械科技有限公司 | A kind of safety lifting device for building |
| CN212513014U (en) * | 2020-08-07 | 2021-02-09 | 河南豫美建设工程检测有限公司 | Building element detection device |
| CN213060113U (en) * | 2020-08-24 | 2021-04-27 | 安忠建 | Adjustable construction platform for assembly type building |
| CN214656426U (en) * | 2021-02-25 | 2021-11-09 | 储志照 | Bridge construction platform |
| WO2021238169A1 (en) * | 2020-05-25 | 2021-12-02 | 苏州贸港机械配件有限公司 | Lifting apparatus for electronic information engineering |
| CN216377328U (en) * | 2021-10-19 | 2022-04-26 | 梁家栋 | Lifting device for building engineering construction |
-
2022
- 2022-06-27 CN CN202210736000.2A patent/CN114876171A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050056488A1 (en) * | 2003-09-11 | 2005-03-17 | Nathaniel Hairston | Buddy's adjustable height workhorse |
| CN104340925A (en) * | 2013-07-24 | 2015-02-11 | 青岛德盛利汽车检测设备有限公司 | Locking device capable of being unlocked itself of scissor lift |
| CN203514290U (en) * | 2013-10-16 | 2014-04-02 | 中国石油大学(华东) | Novel self-elevating drilling platform hoisting mechanism |
| CN110171791A (en) * | 2019-06-04 | 2019-08-27 | 长沙望轶机械科技有限公司 | A kind of safety lifting device for building |
| WO2021238169A1 (en) * | 2020-05-25 | 2021-12-02 | 苏州贸港机械配件有限公司 | Lifting apparatus for electronic information engineering |
| CN212513014U (en) * | 2020-08-07 | 2021-02-09 | 河南豫美建设工程检测有限公司 | Building element detection device |
| CN213060113U (en) * | 2020-08-24 | 2021-04-27 | 安忠建 | Adjustable construction platform for assembly type building |
| CN214656426U (en) * | 2021-02-25 | 2021-11-09 | 储志照 | Bridge construction platform |
| CN216377328U (en) * | 2021-10-19 | 2022-04-26 | 梁家栋 | Lifting device for building engineering construction |
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