CN109368564A - A kind of small-sized lifting device of power equipment maintaining - Google Patents
A kind of small-sized lifting device of power equipment maintaining Download PDFInfo
- Publication number
- CN109368564A CN109368564A CN201811435104.XA CN201811435104A CN109368564A CN 109368564 A CN109368564 A CN 109368564A CN 201811435104 A CN201811435104 A CN 201811435104A CN 109368564 A CN109368564 A CN 109368564A
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- Prior art keywords
- threaded
- fixedly connected
- bottom plate
- mounting blocks
- rod
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Invalid Beds And Related Equipment (AREA)
Abstract
The invention discloses a kind of small-sized lifting devices of power equipment maintaining, including bottom plate, the lower surface of the bottom plate is fixedly connected with the mounting blocks there are four inner hollow, the mounting blocks are evenly distributed on the lower surface of the bottom plate, the outer surface of the mounting blocks is interspersed to be provided with threaded, the mounting blocks are threadedly coupled by threaded hole with the threaded, and one end that the threaded is located inside the mounting blocks is rotatably connected to the first hinged seat by bearing.The present invention passes through setting driving motor, when adjusting working depth causes gravity center shift, driving motor drives the first threaded rod and the rotation of the second threaded rod, move two screw shells relatively or contrarily, two screw shells are opened or are closed according to working depth band support rod, two support rods and the first threaded rod and the second threaded rod form triangular rock-steady structure, play the effect for stablizing support, to achieve the purpose that improve equipment safety.
Description
Technical field
The present invention relates to electrical equipment technical field more particularly to a kind of small-sized lifting devices of power equipment maintaining.
Background technique
Power equipment mainly includes generating equipment and power supply unit two major classes, and generating equipment is mainly station boiler, steam
Turbine, gas turbine, the hydraulic turbine, generator, transformer etc., power supply unit be mainly various voltage class transmission line of electricity,
Mutual inductor, contactor etc..
With popularizing for power equipment, power equipment maintaining is also more particularly important with small-sized lifting device, existing on the market
Some circuit lifting maintenance units are not suitable for the long-time labour of worker, work as work often using tools such as ladder and elevators
When people is in eminence by elevator, center of gravity is moved up, and causes to be easy to tilt to skew, safety is low.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of small-sized lifting devices of power equipment maintaining.
A kind of power equipment maintaining small-sized lifting device, including bottom plate proposed by the present invention, the lower surface of the bottom plate is fixed
There are four the mounting blocks of inner hollow, the mounting blocks to be evenly distributed on the lower surface of the bottom plate for connection, the mounting blocks
Outer surface is interspersed to be provided with threaded, and the mounting blocks are threadedly coupled by threaded hole with the threaded, the screw thread pins position
One end inside the mounting blocks is rotatably connected to the first hinged seat by bearing, and first hinged seat is far from the screw thread
One end of pin is hinged with connecting rod, and sliding slot is offered on the inner wall of the mounting blocks, and the sliding slot is located remotely from the threaded
Side, the internal slide of the sliding slot is connected with sliding block, and the sliding block and the connecting rod are hinged, the lower surface of the sliding block
It is fixedly connected with bracket, the back side of the bracket is rotatably connected to wheel by pin shaft, and the upper surface of the bottom plate is fixedly connected
There is driving motor, the output end of the driving motor is fixedly connected with the first threaded rod, and the right end of first threaded rod is fixed
It is connected with the second threaded rod, the outer surface of first threaded rod is fixedly connected with active angular wheel, the upper table of the bottom plate
By bearing rotation connection there are two the threaded post of inner hollow, the threaded post is located at the right of the driving motor in face, and two
The outer surface of a threaded post is fixedly connected to belt pulley, is sequentially connected with connecting band between two belt pulleys, left
The outer surface of threaded post described in side is fixedly connected with driven angular wheel, the active angular wheel and the driven angular wheel
It is meshed, the inside of two threaded posts is threaded with support threaded rod, and the top of two support threaded rods is solid
Surely it is connected with partition, the lower surface of the partition is fixedly connected with the second hinged seat, and the upper surface of the bottom plate is fixedly connected with
Two sliding rails, the sliding rail are located between two threaded posts, and there are two link block, institutes for the internal slide connection of the sliding rail
The outer surface for stating the first threaded rod and second threaded rod is threaded with screw shell, two screw shells with it is right
The link block answered is fixedly connected, and two screw shells are hinged with support rod far from one end of the bottom plate, and two
The one end of the support rod far from the screw shell is hinged with second hinged seat, and the upper surface of the partition is fixed to be connected
It is connected to one group of telescopic rod, the outer surface of the telescopic rod is arranged with spring, and the top of the telescopic rod is fixedly connected with workbench,
The upper surface of the workbench is fixedly connected with fence.
Preferably, the threaded runs through far from one end of first hinged seat and extends to the outer of the mounting blocks
Side, and it is fixedly connected with turntable, the outer surface of the turntable is arranged with protective jacket.
Preferably, the angular range between the threaded and the connecting rod is 90 degree to a degrees.
Preferably, the cross section of the bracket is T-type, between the left side wall and internal right side wall inside the mounting blocks
It is fixedly connected to block, the length of the bracket is greater than the distance between two described blocks, and the length of the sliding slot is greater than
The distance of the described wheel bottom end of the bracket.
Preferably, the upper surface of the bottom plate is fixedly connected with motor base, the upper surface of the motor base with it is described
Driving motor is fixedly connected, and the driving motor is internally provided with retarder.
Preferably, first threaded rod is identical as the length of second threaded rod, and hand of spiral is on the contrary, described
One threaded rod is identical as the distance between the described plate upper surface of second threaded rod, and the upper surface of the bottom plate is fixed to be connected
It is connected to positioning plate, the left side of the positioning plate is rotatablely connected by bearing and second threaded rod.
Preferably, the angular range between two support rods is 30 degree to 120 degree.
Preferably, for the quantity of the telescopic rod as many as six, the telescopic rod is evenly distributed on the upper table of the partition
Face.
The invention has the advantages that:
(1) the small-sized lifting device of the power equipment maintaining plays the effect for being moved easily device, works as device by the way that wheel is arranged
When being moved to operating position, threaded is rotated, threaded drives connecting rod to move up by the first hinged seat, and connecting rod passes through
Sliding block and supporting band motor car wheel move up, and wheel is moved to not in ground face contact, the effect of storage wheel is played, solves
Because parking unstable problem caused by the rollability of wheel when device is parked.
(2) the small-sized lifting device of the power equipment maintaining, when needing to adjust working depth, is driven by the way that driving motor is arranged
Dynamic motor drives the rotation of the first threaded rod, and the first threaded rod drives left side screw thread by active angular wheel and driven angular wheel
Column rotation, left side threaded post drive right side threaded post rotation by belt pulley and connecting band, and threaded post drives on support threaded rod
Lower movement, to achieve the effect that with elevating function.
(3) the small-sized lifting device of the power equipment maintaining causes center of gravity to become by the way that driving motor is arranged adjusting working depth
When change, driving motor drives the first threaded rod and the rotation of the second threaded rod, moves two screw shells relatively or contrarily, and two
Screw shell is opened or is closed according to working depth band support rod, and two support rods and the first threaded rod and the second threaded rod form
Triangular rock-steady structure plays the effect for stablizing support, to achieve the purpose that improve equipment safety.
(4) the small-sized lifting device of the power equipment maintaining, by the way that spring is arranged, when workbench shakes, spring passes through
Self-deformation absorbs the power for reducing vibration, plays the effect for reducing and shaking and improving device stability, by the way that fence is arranged, plays and mentions
The effect of high equipment safety.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the small-sized lifting device of power equipment maintaining proposed by the present invention；
Fig. 2 is the structural schematic diagram of A in a kind of Fig. 1 of the small-sized lifting device of power equipment maintaining proposed by the present invention；
Fig. 3 is the structural schematic diagram of B in a kind of Fig. 1 of the small-sized lifting device of power equipment maintaining proposed by the present invention；
Fig. 4 is a kind of structural schematic diagram of the power equipment maintaining screw shell of small-sized lifting device proposed by the present invention.
In figure: 1 bottom plate, 2 mounting blocks, 3 threadeds, 4 first hinged seats, 5 connecting rods, 6 sliding slots, 7 sliding blocks, 8 brackets, 9 vehicles
Wheel, 10 driving motors, 11 first threaded rods, 12 second threaded rods, 13 active angular wheels, 14 threaded posts, 15 driven conical tooths
Wheel, 16 support threaded rods, 17 partitions, 18 second hinged seats, 19 sliding rails, 20 link blocks, 21 screw shells, 22 support rods, 23 are stretched
Contracting bar, 24 springs, 25 workbench, 26 fences, 27 belt pulleys, 28 connecting bands.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Referring to Fig.1-4, the small-sized lifting device of a kind of power equipment maintaining, including bottom plate 1, the lower surface of bottom plate 1 are fixedly connected
There are four the mounting blocks 2 of inner hollow, mounting blocks 2 are evenly distributed on the lower surface of bottom plate 1, and the outer surface of mounting blocks 2 is interspersed to be set
It is equipped with threaded 3, mounting blocks 2 are threadedly coupled by threaded hole with threaded 3, and it is logical that threaded 3 is located at one end inside mounting blocks 2
It crosses bearing and is rotatably connected to the first hinged seat 4, threaded 3 runs through far from one end of the first hinged seat 4 and extends to mounting blocks 2
Outside, and it is fixedly connected with turntable, the outer surface of turntable is arranged with protective jacket, and the first hinged seat 4 is cut with scissors far from one end of threaded 3
It is connected to connecting rod 5, the angular range between threaded 3 and connecting rod 5 is 90 degree to a degrees, the inner wall of mounting blocks 2
On offer sliding slot 6, sliding slot 6 is located remotely from the side of threaded 3, and the internal slide of sliding slot 6 is connected with sliding block 7, sliding block 7 and even
Extension bar 5 is hinged, and the lower surface of sliding block 7 is fixedly connected with bracket 8, and the back side of bracket 8 is rotatably connected to wheel 9 by pin shaft, branch
The cross section of frame 8 is T-type, is fixedly connected to block, bracket 8 between the left side wall and internal right side wall inside mounting blocks 2
Length be greater than the distance between two blocks, the length of sliding slot 6 is greater than the distance of equal 9 bottom end of wheel of bracket 8, passes through setting vehicle
Wheel 9, plays the effect for being moved easily device, when device is moved to operating position, rotates threaded 3, threaded 3 passes through the
One hinged seat 4 drives connecting rod 5 to move up, and connecting rod 5 is moved up by sliding block 7 and bracket 8 with motor car wheel 9, by wheel 9
It is moved to the effect that storage wheel 9 is played not in ground face contact, caused by solving when device is parked because of the rollability of wheel 9
Unstable problem is parked, the upper surface of bottom plate 1 is fixedly connected with driving motor 10, and the upper surface of bottom plate 1 is fixedly connected with motor
The upper surface of pedestal, motor base is fixedly connected with driving motor 10, and driving motor 10 is internally provided with retarder, driving electricity
The output end of machine 10 is fixedly connected with the first threaded rod 11, and the right end of the first threaded rod 11 is fixedly connected with the second threaded rod 12,
It is identical as the length of the second threaded rod 12 to state the first threaded rod 11, and hand of spiral is on the contrary, the first threaded rod 11 and the second screw thread
The distance between equal 1 upper surface of bottom plate of bar 12 is identical, and the upper surface of bottom plate 1 is fixedly connected with positioning plate, the left side of positioning plate
It being rotatablely connected by bearing and the second threaded rod 12, the outer surface of the first threaded rod 11 is fixedly connected with active angular wheel 13,
By bearing rotation connection there are two the threaded post 14 of inner hollow, threaded post 14 is located at driving motor 10 for the upper surface of bottom plate 1
Right, the outer surface of two threaded posts 14 is fixedly connected to belt pulley 27, the company of being sequentially connected between two belt pulleys 27
Tape splicing 28, the outer surface of left side threaded post 14 are fixedly connected with driven angular wheel 15, active angular wheel 13 and driven taper
Gear 15 is meshed, and the inside of two threaded posts 14 is threaded with support threaded rod 16, by the way that driving motor 10 is arranged,
When needing to adjust working depth, driving motor 10 drives the rotation of the first threaded rod 11, and the first threaded rod 11 passes through active conical tooth
Wheel 13 and driven angular wheel 15 drive left side threaded post 14 to rotate, and left side threaded post 14 passes through 28 band of belt pulley 27 and connecting band
Dynamic right side threaded post 14 rotates, and threaded post 14 drives support threaded rod 16 to move up and down, to reach the effect with elevating function
Fruit, the top of two support threaded rods 16 are fixedly connected with partition 17, and the lower surface of partition 17 is fixedly connected with the second hinged seat
18, the upper surface of bottom plate 1 is fixedly connected there are two sliding rail 19, and sliding rail 19 is located between two threaded posts 14, the inside of sliding rail 19
The outer surface of link block 20 there are two being slidably connected, the first threaded rod 11 and the second threaded rod 12 is threaded with screw shell
21, two screw shells 21 are fixedly connected with corresponding link block 20, and two one end of screw shell 21 far from bottom plate 1 are hinged
There is support rod 22, the angular range between two support rods 22 is 30 degree to 120 degree, and two support rods 22 are far from spiral shell
One end of line sleeve 21 is hinged with the second hinged seat 18, by the way that driving motor 10 is arranged, causes center of gravity adjusting working depth
When variation, driving motor 10 drives the first threaded rod 11 and the rotation of the second threaded rod 12, keeps two screw shells 21 opposite or phase
Back movement, two screw shells 21 are opened or are closed, two support rods 22 and the first screw thread according to working depth band support rod 22
Bar 11 and the second threaded rod 12 form triangular rock-steady structure, the effect for stablizing support are played, to reach raising equipment safety
The purpose of property, the upper surface of partition 17 are fixedly connected with one group of telescopic rod 23, and the quantity of telescopic rod 23 is as many as six, telescopic rod
23 are evenly distributed on the upper surface of partition 17, and the outer surface of telescopic rod 23 is arranged with spring 24, and the top of telescopic rod 23 is fixed to be connected
It is connected to workbench 25, the upper surface of workbench 25 is fixedly connected with fence 26, by the way that spring 24 is arranged, when workbench 25 shakes
When dynamic, spring 24 absorbs the power for reducing vibration by self-deformation, plays and reduces the effect that vibration improves device stability, passes through
Fence 26 is set, the effect for improving equipment safety is played.
In conclusion the small-sized lifting device of the power equipment maintaining plays by the way that wheel 9 is arranged and is moved easily device
Effect rotates threaded 3 when device is moved to operating position, and threaded 3 drives connecting rod 5 upward by the first hinged seat 4
Mobile, connecting rod 5 is moved up by sliding block 7 and bracket 8 with motor car wheel 9, and wheel 9 is moved to not in ground face contact, is played
The effect for storing wheel 9, solves the problems, such as when device is parked because parking shakiness caused by the rollability of wheel 9.
The small-sized lifting device of the power equipment maintaining, by the way that driving motor 10 is arranged, when needing to adjust working depth, driving
Motor 10 drives the rotation of the first threaded rod 11, and the first threaded rod 11 is driven by active angular wheel 13 and driven angular wheel 15
Left side threaded post 14 rotates, and left side threaded post 14 drives right side threaded post 14 to rotate by belt pulley 27 and connecting band 28, screw thread
Column 14 drives support threaded rod 16 to move up and down, to achieve the effect that with elevating function.
The small-sized lifting device of the power equipment maintaining causes center of gravity to become by the way that driving motor 10 is arranged adjusting working depth
When change, driving motor 10 drives the first threaded rod 11 and the rotation of the second threaded rod 12, makes two screw shells 21 relatively or contrarily
Mobile, two screw shells 21 are opened or are closed, two support rods 22 and the first threaded rod according to working depth band support rod 22
11 and second threaded rod 12 form triangular rock-steady structure, play stablize support effect, thus reach improve equipment safety
Purpose.
The small-sized lifting device of the power equipment maintaining, by the way that spring 24 is arranged, when workbench 25 shakes, spring 24 is logical
It crosses self-deformation and absorbs the power for reducing vibration, play and reduce the effect that vibration improves device stability, by the way that fence 26 is arranged, rise
To the effect for improving equipment safety.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of small-sized lifting device of power equipment maintaining, including bottom plate (1), which is characterized in that the lower surface of the bottom plate (1) is solid
There are four the mounting blocks (2) of inner hollow, the mounting blocks (2) are evenly distributed on the lower surface of the bottom plate (1), institute for fixed connection
The outer surface for stating mounting blocks (2), which is interted, to be provided with threaded (3), and the mounting blocks (2) pass through threaded hole and the threaded (3)
It is threadedly coupled, the threaded (3) is located at the internal one end of the mounting blocks (2) and is rotatably connected to the first hinged seat by bearing
(4), first hinged seat (4) is hinged with connecting rod (5) far from the one end of the threaded (3), the mounting blocks (2) it is interior
It is offered on wall sliding slot (6), the sliding slot (6) is located remotely from the side of the threaded (3), and the inside of the sliding slot (6) is sliding
Dynamic to be connected with sliding block (7), hingedly, the lower surface of the sliding block (7) is fixedly connected with for the sliding block (7) and the connecting rod (5)
The back side of bracket (8), the bracket (8) is rotatably connected to wheel (9) by pin shaft, and the upper surface of the bottom plate (1) is fixed to be connected
It is connected to driving motor (10), the output end of the driving motor (10) is fixedly connected with the first threaded rod (11), first spiral shell
The right end of rasp bar (11) is fixedly connected with the second threaded rod (12), and the outer surface of first threaded rod (11) is fixedly connected with master
The upper surface of dynamic angular wheel (13), the bottom plate (1) is rotatablely connected the threaded post (14) there are two inner hollow by bearing,
The threaded post (14) is located at the right of the driving motor (10), and the outer surface of two threaded posts (14) is fixedly connected with
Have belt pulley (27), is sequentially connected with connecting band (28) between two belt pulleys (27), the left side threaded post (14)
Outer surface is fixedly connected with driven angular wheel (15), the active angular wheel (13) and driven angular wheel (15) phase
Engagement, the inside of two threaded posts (14) are threaded with support threaded rod (16), two support threaded rods
(16) top is fixedly connected with partition (17), and the lower surface of the partition (17) is fixedly connected with the second hinged seat (18), institute
The upper surface for stating bottom plate (1) is fixedly connected there are two sliding rail (19), the sliding rail (19) be located at two threaded posts (14) it
Between, there are two link block (20), first threaded rod (11) and second spiral shells for the internal slide connection of the sliding rail (19)
The outer surface of rasp bar (12) is threaded with screw shell (21), two screw shells (21) and the corresponding connection
Block (20) is fixedly connected, and two screw shells (21) are hinged with support rod (22) far from the one end of the bottom plate (1), and two
A support rod (22) far from the screw shell (21) one end with second hinged seat (18) hingedly, the partition
(17) upper surface is fixedly connected with one group of telescopic rod (23), and the outer surface of the telescopic rod (23) is arranged with spring (24), institute
The top for stating telescopic rod (23) is fixedly connected with workbench (25), and the upper surface of the workbench (25) is fixedly connected with fence
(26).
2. a kind of small-sized lifting device of power equipment maintaining according to claim 1, which is characterized in that the threaded (3)
One end far from first hinged seat (4) is run through and extends to the outside of the mounting blocks (2), and is fixedly connected with turntable,
The outer surface of the turntable is arranged with protective jacket.
3. a kind of small-sized lifting device of power equipment maintaining according to claim 1, which is characterized in that the threaded (3)
Angular range between the connecting rod (5) is 90 degree to a degrees.
4. a kind of small-sized lifting device of power equipment maintaining according to claim 1, which is characterized in that the bracket (8)
Cross section is T-type, is fixedly connected to block between the internal left side wall of the mounting blocks (2) and the right side wall of inside, described
The length of bracket (8) is greater than the distance between two described blocks, and the length of the sliding slot (6) is greater than the bracket (8) equal institute
State the distance of wheel (9) bottom end.
5. a kind of small-sized lifting device of power equipment maintaining according to claim 1, which is characterized in that the bottom plate (1)
Upper surface is fixedly connected with motor base, and the upper surface of the motor base is fixedly connected with the driving motor (10), described
Driving motor (10) is internally provided with retarder.
6. a kind of small-sized lifting device of power equipment maintaining according to claim 1, which is characterized in that first threaded rod
(11) identical as the length of second threaded rod (12), and hand of spiral is on the contrary, first threaded rod (11) and described the
The distance between described bottom plate (1) upper surface of two threaded rods (12) is identical, and the upper surface of the bottom plate (1) is fixedly connected with fixed
The left side of position plate, the positioning plate is rotatablely connected by bearing and second threaded rod (12).
7. a kind of small-sized lifting device of power equipment maintaining according to claim 1, which is characterized in that two support rods
(22) angular range between is 30 degree to 120 degree.
8. a kind of small-sized lifting device of power equipment maintaining according to claim 1, which is characterized in that the telescopic rod (23)
Quantity as many as six, the telescopic rod (23) is evenly distributed on the upper surface of the partition (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435104.XA CN109368564A (en) | 2018-11-28 | 2018-11-28 | A kind of small-sized lifting device of power equipment maintaining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435104.XA CN109368564A (en) | 2018-11-28 | 2018-11-28 | A kind of small-sized lifting device of power equipment maintaining |
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| CN109368564A true CN109368564A (en) | 2019-02-22 |
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| CN201811435104.XA Pending CN109368564A (en) | 2018-11-28 | 2018-11-28 | A kind of small-sized lifting device of power equipment maintaining |
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