CN115340039A - Lifter for adjusting angle of chassis of trailer - Google Patents
Lifter for adjusting angle of chassis of trailer Download PDFInfo
- Publication number
- CN115340039A CN115340039A CN202211072372.6A CN202211072372A CN115340039A CN 115340039 A CN115340039 A CN 115340039A CN 202211072372 A CN202211072372 A CN 202211072372A CN 115340039 A CN115340039 A CN 115340039A
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- China
- Prior art keywords
- angle
- lifter
- trailer
- adjusting
- chassis
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- 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
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
- B66F3/18—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through worm gearings
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
The invention belongs to the technical field of lifter equipment, and discloses a lifter for adjusting the angle of a chassis of a trailer, which comprises a base, wherein two ends of an inner cavity of the base are movably connected with worm wheels, the inner cavity of the base is movably connected with a speed reduction turbine positioned on one side of the worm wheels, an inner cavity of a sleeve rod is movably connected with a telescopic clamping block, and the bottom of the inner cavity of the sleeve rod is movably connected with a tension spring. According to the invention, through the matching among the structures such as the worm, the speed reduction turbine, the gear, the threaded rod and the like, the device has the effect of conveniently adjusting the angle of the chassis, the telescopic fixture block and the sleeve rod are driven to rotate through rotating the pull rod, so that the worm rotates to further enable the speed reduction turbine meshed with the worm to rotate, finally, the rotating block and the round shaft are lifted to drive one side of the trailer body to ascend, and the angle of one side of the trailer body is further changed, so that the use of an operator is facilitated.
Description
Technical Field
The invention belongs to the technical field of lifter equipment, and particularly relates to a lifter for adjusting the angle of a chassis of a trailer.
Background
The lifting trailer is also called as a missile hooking vehicle and a top trailer, is used as a guarantee device for hooking weapons, is mainly in a scissor fork type and an arm lifting type, and mainly structurally comprises a chassis, a lifting mechanism, a posture adjusting mechanism, a hydraulic system and the like.
For example, the utility model with publication number CN208515825U provides a lifting device for adjusting the angle of a trailer chassis, the lifting device is respectively connected with a frame for lifting the trailer chassis and a front wheel for lifting the trailer chassis, the lifting device comprises a lifting mechanism and a connecting mechanism, the lifting mechanism comprises a first lifting mechanism and a second lifting mechanism, the first lifting mechanism comprises a T-shaped threaded sleeve, a first limit check ring and a first screw, the inner wall of the T-shaped threaded sleeve is also provided with a threaded sleeve internal thread, and one end of the T-shaped threaded sleeve is provided with an annular baffle; the second lifting mechanism comprises a vertical shaft, a second limiting check ring and a second screw, one end of the vertical shaft is connected with the frame, and the other end of the vertical shaft is connected inside the T-shaped threaded sleeve; the connecting mechanism comprises a shaft sleeve sleeved on the outer wall of the T-shaped threaded sleeve and two screw shafts connected to the shaft sleeve, one end of each screw shaft is installed on the shaft sleeve through a threaded hole, and the other end of each screw shaft is connected with a front wheel of the trailer chassis.
The chassis of the lifting trailer is a main bearing force part of the lifting trailer and is responsible for the walking, steering and parking braking of a vehicle, if a hanging product on the lifting trailer is not parallel to the axis direction of the launcher, the hanging steps of the product can be increased, and the hanging efficiency is reduced, so that the lifter for adjusting the angle of the chassis of the lifting trailer is provided, and the problems in the background art are solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a lifter for adjusting the angle of a chassis of a trailer, which is characterized in that a telescopic clamping block and a loop bar are driven to rotate by rotating a pull rod, so that a worm rotates to rotate, a reduction turbine meshed with the worm rotates, a gear and a threaded rod are driven to rotate, and a lifting column rises.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a riser for adjusting rise trailer chassis angle, includes the base, the both ends swing joint of base inner chamber has the scroll bar, the inner chamber swing joint of base has the speed reduction turbine that is located scroll bar one side, the top fixedly connected with protective housing of base, the inner chamber swing joint of protective housing has the gear, the surface threaded connection of threaded rod has the lift post, the top fixedly connected with elastic spring of lift post inner chamber, the inner chamber swing joint of lift post has the gag lever post, the top swing joint of lift post has the rotating block, the both sides swing joint of scroll bar surface has the loop bar, the inner chamber swing joint of loop bar has flexible fixture block, the bottom swing joint of loop bar inner chamber has tension spring.
Among the above-mentioned technical scheme, preferred, the surface at speed reduction turbine middle part and the inner chamber swing joint of protective housing, the surface of one side and the relative one side of scroll mesh mutually of speed reduction turbine surface bottom.
In the above technical scheme, preferably, the top of the outer surface of the reduction turbine is movably connected with the inner cavity of the protective shell, the gear is located above the worm, and one side of the top of the outer surface of the reduction turbine is meshed with the outer surface of one side of the gear.
Among the above-mentioned technical scheme, preferably, the bottom of gag lever post and the top fixed connection of protective housing, the quantity of gag lever post is four, four the gag lever post annular is waiting the angle and the inner chamber swing joint of lift post, the top and the lower surface fixed connection on gag lever post upper portion of elastic spring.
In the above technical scheme, preferably, annular clamping grooves are formed in two sides of the outer surface of the scroll rod, and an inner cavity of each annular clamping groove is matched with the bottom end of the outer surface of the telescopic clamping block.
In the above technical scheme, preferably, the other end of the tension spring is fixedly connected with one side of the outer surface of the middle part of the gear, the number of the telescopic clamping blocks is two, and a pull rod is fixedly connected between the outer surfaces of the opposite sides of one ends of the two telescopic clamping blocks.
In the above technical scheme, preferably, the inner cavity at the top of the rotating block is movably connected with a round shaft, and two sides of the outer surface of the round shaft are movably connected with a trailer lifting body.
Among the above-mentioned technical scheme, it is preferred, the both sides fixedly connected with fixed axle of base bottom, the surface fixedly connected with gyro wheel of fixed axle, the bottom fixedly connected with of base draws the piece.
Among the above-mentioned technical scheme, preferred, the inner chamber of fixed axle one side and the surface swing joint of loop bar, the surface and the fixed axle swing joint at scroll bar both ends.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the lifting column, the matching among the structures such as the worm rod, the speed reducing turbine, the gear, the threaded rod and the like is adopted, so that the device has the effect of conveniently adjusting the angle of the chassis on one side of the lifting trailer, the telescopic fixture block and the sleeve rod are driven to rotate by rotating the pull rod, the worm rod is rotated, the speed reducing turbine meshed with the worm rod is further driven to rotate, the gear and the threaded rod are further driven to rotate, the lifting column is further lifted, meanwhile, due to the matching among the lifting column, the limiting rod and the elastic spring, the limiting and buffering effects on the lifting column are achieved, the rotating block and the round shaft are finally lifted to drive one side of the lifting trailer body to lift, the angle on one side of the lifting trailer body is further changed, and the use of an operator is facilitated.
2. According to the invention, through the matching of the structures such as the scroll rod, the sleeve rod, the telescopic fixture block and the tension spring, the device has the effect of conveniently rotating the scroll rod so as to conveniently lift the device, the telescopic fixture block drives the fixed shaft and the scroll rod to rotate through rotating the pull rod, the pull rod is pulled outwards at the moment so that the bottom of the telescopic fixture block is separated from the clamping grooves on the two sides of the scroll rod, the tension spring is in a stretching state at the moment, the pull rod is rotated and reset at the same time, the pull rod is loosened at the moment, the bottom end of the telescopic fixture block is clamped into the clamping grooves on the two sides of the scroll rod due to the tensile force of the tension spring, and at the moment, an operator circulates the last step, so that the device is convenient to rotate the scroll rod, and meanwhile, the use of the operator is also convenient.
3. According to the invention, the lifting column, the rotating block, the pulling block, the lifting trailer body and other structures are matched, so that the device has an effect of conveniently adjusting the moving direction, the base is driven to rotate by pulling the pulling block, the bottom of the rotating block and the lifting column are further relatively rotated, the roller on one side of the pulling block and the roller on one side of the lifting trailer body form a certain included angle, and when an operator pulls the pulling block to move forwards, the moving direction of the lifting trailer body is changed, so that the movement of the operator is facilitated.
Drawings
FIG. 1 is a schematic view of the construction of the lifting column of the present invention;
FIG. 2 is a schematic cross-sectional front view of the present invention;
FIG. 3 is a side cross-sectional view of a reduction turbine according to the present invention;
FIG. 4 is a schematic side sectional view of the retractable latch of the present invention;
FIG. 5 is an enlarged view at A in FIG. 4;
FIG. 6 is an exploded view of the present invention at a fixed axis;
fig. 7 is a schematic view of the overall structure of the present invention.
In the figure: 1. a base; 2. a scroll bar; 3. a deceleration turbine; 4. a protective shell; 5. a gear; 6. a threaded rod; 7. a lifting column; 8. a limiting rod; 9. an elastic spring; 10. rotating the block; 11. a loop bar; 12. a fixed shaft; 13. a roller; 14. a telescopic clamping block; 15. a tension spring; 16. a pull rod; 17. pulling the block; 18. a circular shaft; 19. and lifting the trailer body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1 to 7, the invention provides a lifter for adjusting the angle of a chassis of a trailer, which comprises a base 1, wherein two ends of an inner cavity of the base 1 are movably connected with a worm rod 2, the inner cavity of the base 1 is movably connected with a speed reduction turbine 3 positioned on one side of the worm rod 2, the top of the base 1 is fixedly connected with a protective shell 4, the inner cavity of the protective shell 4 is movably connected with a gear 5, the outer surface of a threaded rod 6 is connected with a lifting column 7 through threads, the top of the inner cavity of the lifting column 7 is fixedly connected with an elastic spring 9, the inner cavity of the lifting column 7 is movably connected with a limiting rod 8, the top of the lifting column 7 is movably connected with a rotating block 10, two sides of the outer surface of the worm rod 2 are movably connected with sleeve rods 11, the inner cavity of the sleeve rods 11 is movably connected with telescopic clamping blocks 14, and the bottom of the inner cavity of the sleeve rods 11 is movably connected with a tension spring 15;
through rotatory pull rod 16, and then drive flexible fixture block 14 and loop bar 11 and take place rotatoryly, thereby make worm 2 take place to rotate and then make the rotation with worm 2 meshing reduction turbine 3 mutually, and then drive gear 5 and threaded rod 6 and take place rotatoryly, and then make lift post 7 rise, simultaneously because lift post 7, cooperation between gag lever post 8 and the elastic spring 9, thereby spacing and the buffering to lift post 7 have been played, finally make the rotatory piece 10 and round axle 18 rise and drive one side of lifting trailer body 19 and rise, thereby be convenient for install the regulation on chassis.
As shown in fig. 3 and 6, the outer surface of the middle part of the reduction turbine 3 is movably connected with the inner cavity of the protective shell 4, and one side of the bottom of the outer surface of the reduction turbine 3 is meshed with the outer surface of the opposite side of the worm 2;
adopt above-mentioned scheme: through the rotation of scroll bar 2, will make speed reduction turbine 3 take place to rotate, simultaneously because the cooperation between scroll bar 2 and the speed reduction turbine 3 to make scroll bar 2 drive speed reduction turbine 3 more laborsaving when taking place to rotate, when scroll bar 2 stops rotating simultaneously, thereby prevented that speed reduction turbine 3's rotation from driving scroll bar 2 rotatory.
As shown in fig. 3, the top of the outer surface of the reduction turbine 3 is movably connected with the inner cavity of the protective shell 4, the gear 5 is located above the worm 2, and one side of the top of the outer surface of the reduction turbine 3 is meshed with the outer surface of one side of the gear 5;
the scheme is adopted: through the design of reduction turbine 3, when reduction turbine 3 takes place to rotate, will drive and take place to rotate with it engaged gear 5 mutually, make reduction turbine 3 drive gear 5 more laborsaving when taking place to rotate simultaneously, made things convenient for operating personnel's use.
As shown in fig. 2, 3 and 6, the bottom of the limiting rod 8 is fixedly connected with the top of the protective shell 4, the number of the limiting rods 8 is four, the four limiting rods 8 are annularly and equiangularly movably connected with the inner cavity of the lifting column 7, and the top of the elastic spring 9 is fixedly connected with the lower surface of the upper part of the limiting rod 8;
adopt above-mentioned scheme: through the cooperation between lift post 7, gag lever post 8 and the elasticity spring 9 to played the limiting displacement to lift post 7 when lift motion takes place for lift post 7, simultaneously the design of elasticity spring 9, thereby played the cushioning effect to lift post 7.
As shown in fig. 5 and 6, two sides of the outer surface of the scroll bar 2 are provided with annular clamping grooves, and the inner cavities of the annular clamping grooves are matched with the bottom ends of the outer surfaces of the telescopic clamping blocks 14;
adopt above-mentioned scheme: through the cooperation between draw-in groove and the flexible fixture block 14 to be convenient for drive the scroll bar 2 and take place the rotation when making operating personnel rotatory pull rod 16.
As shown in fig. 1 and 5, the other end of the tension spring 15 is fixedly connected with one side of the outer surface of the middle part of the gear 5, the number of the telescopic fixture blocks 14 is two, and a pull rod 16 is fixedly connected between the outer surfaces of the opposite sides of one ends of the two telescopic fixture blocks 14;
adopt above-mentioned scheme: through the rotatory pull rod 16 of operating personnel, will make flexible fixture block 14 drive fixed axle 12 and scroll bar 2 and take place the rotation, outside pulling pull rod 16 makes the bottom of flexible fixture block 14 break away from the draw-in groove of 2 both sides of scroll bar this moment, tension spring 15 is tensile state this moment, with pull rod 16 rotation reset simultaneously, loosen pull rod 16 this moment, because the effect of tension spring 15 pulling force, thereby make the bottom card of flexible fixture block 14 go into to among the draw-in groove of 2 both sides of scroll bar, operating personnel circulates last step this moment, thereby make the device be convenient for the rotation to scroll bar 2.
As shown in fig. 7, the inner cavity at the top of the rotating block 10 is movably connected with a round shaft 18, and two sides of the outer surface of the round shaft 18 are movably connected with a lifting vehicle body 19;
adopt above-mentioned scheme: through the rising of lift post 7, will make rotatory piece 10 drive round axle 18 and rise, and then make one side of rising trailer body 19 rise to make the angle of rising trailer body 19 one side change, the one side of rising trailer body 19 will use round axle 18 to take place the rotation as the axle center this moment, thereby make more stable when rising of lift post 7.
As shown in fig. 1, 6 and 7, two sides of the bottom of the base 1 are fixedly connected with a fixed shaft 12, the outer surface of the fixed shaft 12 is fixedly connected with a roller 13, and the bottom of the base 1 is fixedly connected with a pull block 17;
the scheme is adopted: one side of the two fixed shafts 12 and two sides of the base 1 are fixedly connected, so that the limiting effect on the roller 13 is achieved, and the roller 13 can stably run.
As shown in fig. 1, 2 and 6, an inner cavity at one side of the fixed shaft 12 is movably connected with the outer surface of the loop bar 11, and the outer surfaces at two ends of the vortex bar 2 are movably connected with the fixed shaft 12;
adopt above-mentioned scheme: the sleeve rod 11 and the fixed shaft 12 are matched with each other, so that the fixed shaft 12 is prevented from being rotated when the scroll bar 2 rotates.
The working principle and the using process of the invention are as follows:
at first, operating personnel rotates pull rod 16, and then it is rotatory to drive flexible fixture block 14 and loop bar 11, thereby make vortex rod 2 take place to rotate and then make the rotation with vortex rod 2 meshing reduction turbine 3, and then it is rotatory to drive gear 5 and threaded rod 6, and then make lift post 7 rise, simultaneously because lift post 7, cooperation between gag lever post 8 and the elastic spring 9, thereby spacing and the buffering to lift post 7 have been played, finally make rotatory piece 10 and round axle 18 rise and drive one side of lifting trailer body 19 and rise, and then the angle of lifting trailer body 19 one side has been changed, so that operating personnel's use.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a riser for adjusting rise trailer chassis angle, includes base (1), its characterized in that: the utility model discloses a lifting mechanism, including base (1), inner chamber, gear, lifting column (7), base (1), inner chamber swing joint have the speed reduction turbine (3) that are located worm wheel (2) one side, the top fixedly connected with protective housing (4) of base (1), the inner chamber swing joint of protective housing (4) has gear (5), the surface threaded connection of threaded rod (6) has lifting column (7), the top fixedly connected with elastic spring (9) of lifting column (7) inner chamber, the inner chamber swing joint of lifting column (7) has gag lever post (8), the top swing joint of lifting column (7) has rotating block (10), the both sides swing joint of worm (2) surface has loop bar (11), the inner chamber swing joint of loop bar (11) has flexible fixture block (14), the bottom swing joint of loop bar (11) inner chamber has tension spring (15).
2. A lifter for adjusting the angle of a chassis of a trailer according to claim 1, characterized in that: the outer surface in the middle of the speed reduction turbine (3) is movably connected with the inner cavity of the protective shell (4), and one side of the bottom of the outer surface of the speed reduction turbine (3) is meshed with the outer surface of the opposite side of the worm rod (2).
3. A lifter for adjusting the angle of a trailer chassis according to claim 1, characterized in that: the top of the surface of reduction turbine (3) and the inner chamber swing joint of protective housing (4), gear (5) are located the top of scroll bar (2), one side at reduction turbine (3) surface top meshes with the surface of gear (5) one side mutually.
4. A lifter for adjusting the angle of a chassis of a trailer according to claim 1, characterized in that: the bottom of gag lever post (8) and the top fixed connection of protective housing (4), the quantity of gag lever post (8) is four, four the inner chamber swing joint of angles such as gag lever post (8) annular and lift post (7), the lower fixed surface on top and gag lever post (8) upper portion of elastic spring (9) is connected.
5. A lifter for adjusting the angle of a trailer chassis according to claim 1, characterized in that: annular clamping grooves are formed in two sides of the outer surface of the scroll rod (2), and inner cavities of the annular clamping grooves are matched with the bottom end of the outer surface of the telescopic clamping block (14).
6. A lifter for adjusting the angle of a trailer chassis according to claim 1, characterized in that: the other end of the tension spring (15) is fixedly connected with one side of the outer surface of the middle part of the gear (5), the number of the telescopic clamping blocks (14) is two, and a pull rod (16) is fixedly connected between the outer surfaces of the opposite sides of one ends of the two telescopic clamping blocks (14).
7. A lifter for adjusting the angle of a chassis of a trailer according to claim 1, characterized in that: the inner cavity at the top of the rotating block (10) is movably connected with a round shaft (18), and two sides of the outer surface of the round shaft (18) are movably connected with a lifting vehicle body (19).
8. A lifter for adjusting the angle of a trailer chassis according to claim 1, characterized in that: the base is characterized in that fixed shafts (12) are fixedly connected to two sides of the bottom of the base (1), rollers (13) are fixedly connected to the outer surfaces of the fixed shafts (12), and pull blocks (17) are fixedly connected to the bottom of the base (1).
9. A lifter for adjusting the angle of a chassis of a trailer according to claim 1, characterized in that: the inner cavity of one side of the fixed shaft (12) is movably connected with the outer surface of the loop bar (11), and the outer surfaces of the two ends of the scroll bar (2) are movably connected with the fixed shaft (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211072372.6A CN115340039A (en) | 2022-09-02 | 2022-09-02 | Lifter for adjusting angle of chassis of trailer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211072372.6A CN115340039A (en) | 2022-09-02 | 2022-09-02 | Lifter for adjusting angle of chassis of trailer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115340039A true CN115340039A (en) | 2022-11-15 |
Family
ID=83955141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211072372.6A Pending CN115340039A (en) | 2022-09-02 | 2022-09-02 | Lifter for adjusting angle of chassis of trailer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115340039A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201746275U (en) * | 2009-12-02 | 2011-02-16 | 煤炭科学研究总院西安研究院 | Manual-lifting angle-changing mechanism |
| CN204529205U (en) * | 2015-03-11 | 2015-08-05 | 宁波捷美进出口有限公司 | Jack |
| CN205085881U (en) * | 2015-10-08 | 2016-03-16 | 奇瑞汽车股份有限公司 | Wrench tool |
| CN107445096A (en) * | 2017-08-28 | 2017-12-08 | 鞍钢集团矿业有限公司 | Telescopic multifunctional hoisting apparatus |
| CN110304577A (en) * | 2019-06-21 | 2019-10-08 | 浙江神阳机电科技有限公司 | It is a kind of to change the outfit the lifting device of hoistable platform for battery |
| CN111547641A (en) * | 2020-04-29 | 2020-08-18 | 山东嵘野房车制造服务有限公司 | Manual and electric control lifting device |
| CN212450508U (en) * | 2020-03-31 | 2021-02-02 | 浙江水利水电学院 | Foldable waist bending auxiliary lifting platform |
-
2022
- 2022-09-02 CN CN202211072372.6A patent/CN115340039A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201746275U (en) * | 2009-12-02 | 2011-02-16 | 煤炭科学研究总院西安研究院 | Manual-lifting angle-changing mechanism |
| CN204529205U (en) * | 2015-03-11 | 2015-08-05 | 宁波捷美进出口有限公司 | Jack |
| CN205085881U (en) * | 2015-10-08 | 2016-03-16 | 奇瑞汽车股份有限公司 | Wrench tool |
| CN107445096A (en) * | 2017-08-28 | 2017-12-08 | 鞍钢集团矿业有限公司 | Telescopic multifunctional hoisting apparatus |
| CN110304577A (en) * | 2019-06-21 | 2019-10-08 | 浙江神阳机电科技有限公司 | It is a kind of to change the outfit the lifting device of hoistable platform for battery |
| CN212450508U (en) * | 2020-03-31 | 2021-02-02 | 浙江水利水电学院 | Foldable waist bending auxiliary lifting platform |
| CN111547641A (en) * | 2020-04-29 | 2020-08-18 | 山东嵘野房车制造服务有限公司 | Manual and electric control lifting device |
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