CN109019423A - A kind of Self-aligning safe spin lifting device - Google Patents
A kind of Self-aligning safe spin lifting device Download PDFInfo
- Publication number
- CN109019423A CN109019423A CN201811084406.7A CN201811084406A CN109019423A CN 109019423 A CN109019423 A CN 109019423A CN 201811084406 A CN201811084406 A CN 201811084406A CN 109019423 A CN109019423 A CN 109019423A
- Authority
- CN
- China
- Prior art keywords
- nut
- seat
- lead screw
- square column
- aligning
- 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.)
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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
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
- B66F7/12—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by mechanical jacks
- B66F7/14—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by mechanical jacks screw operated
-
- 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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
-
- 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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H2025/2445—Supports or other means for compensating misalignment or offset between screw and nut
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Transmission Devices (AREA)
- Support Of The Bearing (AREA)
Abstract
The present invention relates to spiral lift device field more particularly to a kind of Self-aligning safe spin lifting devices.The present invention includes guiding square column, and the side for being oriented to square column is provided with U-type groove, is oriented on square column and is arranged with nut seat, if nut seat, which passes through bearing close to the surrounding of guiding square column, is equipped with dry drum or several idler wheels, roller and idler wheel are contacted with the surface of guiding square column；Lead screw is arranged in U-type groove, threads of lead screw is connected with nut, and the both ends of lead screw are connect with guiding square column by bearing；Universal bearing seat mechanism is arranged on the lead screw, one end of universal bearing seat mechanism is fixed on nut seat, and the other end of universal bearing seat mechanism is connect with nut；Servo-actuated torsion seat mechanism is further fixed on nut seat, the other end of servo-actuated torsion seat mechanism is clamped on nut.The present invention provides a kind of guarantee lead screws and the accurate centering of nut to have guaranteed the Self-aligning safe spin lifting device that nut steadily moves.
Description
Technical field
The present invention relates to spiral lift device field more particularly to a kind of Self-aligning safe spin lifting devices.
Background technique
Spiral lifting mode is a kind of common form of short stroke and middle short stroke heavy lift elevator, heavy lift pair
Lift stroke path has no special required precision, and in order to reduce cost, often the guiding device precision of elevator is lower, it is difficult to protect
Demonstrate,prove accurate centering between the screw rod axis and nut in worm drive.Lead screw and nut can not accurate centering when, the transmission of nut
It is obstructed, the lifting device connecting with nut generates shaking because steady movement is difficult to.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, a kind of guarantee lead screw is provided and the accurate centering of nut has guaranteed that nut is flat
The Self-aligning safe spin lifting device surely moved, the accuracy of alignment for solving lead screw and nut is poor, lifting device cannot be steady
The problem of lifting.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of Self-aligning safe spin lifting device, including guiding square column, the side for being oriented to square column is provided with U-type groove, leads
Nut seat is arranged on square column, if if nut seat, which passes through bearing close to the surrounding of guiding square column, is equipped with dry drum or dry milling
Wheel, roller and idler wheel are contacted with the surface of guiding square column；Lead screw is arranged in U-type groove, threads of lead screw is connected with nut, lead screw
Both ends connect with guiding square column by bearing；Universal bearing seat mechanism, universal bearing seat mechanism are arranged on the lead screw
One end be fixed on nut seat, the other end of universal bearing seat mechanism is connect with nut；Servo-actuated torsion is further fixed on nut seat
The other end of power seat mechanism, servo-actuated torsion seat mechanism is clamped on nut.
As a preferred solution of the present invention, the universal bearing seat mechanism includes bearing block, and bearing block is sheathed on lead screw,
The lower end of bearing block is fixed with concave spherical surface seat, and concave spherical surface seat lower end is arranged with convex spherical seat, and concave spherical surface seat and convex spherical seat cover
On lead screw, the lower end of convex spherical seat is fixed with several pillars, and the other end of pillar is connect with nut, and several pillars are distributed in
On circumference centered on the center line of nut.
As a preferred solution of the present invention, be provided with anti-fall nut between the convex spherical seat and nut, anti-fall nut with
Threads of lead screw connects, and is provided with several through-holes on anti-fall nut, pillar is sheathed in through-hole.
As a preferred solution of the present invention, floating is connected between the upper end and convex spherical seat of the anti-fall nut to move
Spring is connected with lower floating spring between the lower end and nut of anti-fall nut.
As a preferred solution of the present invention, the quantity of the pillar is no less than three.
As a preferred solution of the present invention, the servo-actuated torsion seat mechanism includes slide, and slide is horizontally disposed, slide inner sleeve
Equipped with sliding block, it is provided with slide opening on sliding block, slide post is arranged in slide opening, U type fixture block, U-shaped folder block folder are fixed on slide post
Tightly on nut.
As a preferred solution of the present invention, the upper end of the U-shaped folder block is provided with card slot, is arranged with spring core in card slot
Bar, the other end and the nut of spring core rod are fixed, and support spring are arranged on spring core rod, support spring is connected to nut and U
Between type fixture block.
Compared with prior art, the beneficial effects of the present invention are:
1, it is contacted due to the roller of nut seat surrounding or idler wheel with guiding square column, then when nut seat generates certain inclination, led
It can also be tilted together to square column.Since the both ends of lead screw are connect with guiding square column by bearing, then lead screw can be with guiding square column
It tilts together.The universal bearing seat mechanism energy draw nut inclination being arranged on lead screw.Therefore lead screw and nut can be substantially coaxial.Ten thousand
It is sheathed on lead screw to bearing seat mechanism, then universal bearing seat mechanism is drawn from each of whole circumference to nut, is avoided
Nut seat directly consolidate with nut timing nuts always by unilateral side traction the case where.Universal bearing seat mechanism is from each to nut
It is drawn, the centering that can further improve nut and lead screw carries out height.While torsion seat mechanism limits nut rotation, also
The subtle movement of nut opposing nut seat during certifiable nut adjustment, guarantees that nut can follow lead screw to adjust in real time.Nut seat
Gravity can substantially be distributed on universal bearing seat mechanism, facilitate nut and screw centring, nut avoided to fix with nut seat
The case where nut and lead screw are difficult to centering when connection.After nut and the accurate centering of lead screw, nut can be moved steadily, reduce shake or
The case where nut movement is obstructed.
2, the gravity of nut seat pass sequentially through bearing base, concave spherical surface seat, convex spherical seat, pillar and act on nut.When
When nut generates subtle offset relative to lead screw, under the blocking of concave spherical surface seat, the timely return of convex spherical seat energy, so that pillar is drawn
Dynamic nut return, nut and lead screw accurate centering always.
3, anti-fall nut device work normally when with one lifting of nut without carry, but when nut due to abrasion
When failure, anti-fall nut bears axial load and prevents weight from falling, and plays the role of safeguard protection.
4, by being separately connected upper floating spring and lower floating spring at the both ends of anti-fall nut, so that anti-when working normally
Falling nut can move together with nut without feelings loaded, avoiding anti-fall nut that nut movement is caused to be obstructed because loaded
Condition.
5, three pillars are distributed on the circumference centered on the center line of nut, then when convex spherical seat adjustment position, spiral shell
Uniform force on female circumferencial direction is difficult to and the case where screw centring when reducing nut unbalance stress.
6, U-shaped folder block can limit nut rotation, guarantee that nut is steadily gone up and down.Sliding block can slide in slide, slide post energy
It is moved in slide opening, then nut can be mobile relative to nut seat in two mutually orthogonal directions in the horizontal plane, thus nut
The adjustment of universal bearing seat mechanism is adapted to, guarantee nut is adjusted in time and screw centring.
7, support spring can link together U-shaped folder block and nut, and U-shaped folder block is allowed to generate one relative to nut
Fixed sliding avoids stress between U-shaped folder block and nut from concentrating.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is A-A direction view in Fig. 1；
Fig. 3 is B-B direction view in Fig. 1；
Fig. 4 is C-C direction view in Fig. 1；
Fig. 5 is the partial enlarged view in Fig. 1 at D；
Fig. 6 is partial enlarged view at E in Fig. 2.
In figure, 1- is oriented to square column, and 2- nut seat, 3- lead screw, 4- nut, 5- universal bearing seat mechanism, 6- is servo-actuated torsion seat
Mechanism, the anti-fall nut of 7-, 11-U type groove, 21- roller, 22- idler wheel, 51- bearing block, 52- concave spherical surface seat, 53- convex spherical seat,
54- pillar, 61- slide, 62- sliding block, 63- slide post, 64-U type fixture block, 65- spring core rod, 66- support spring, 71- float
It moves spring, floating spring under 72-.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Embodiment one
A kind of Self-aligning safe spin lifting device, including guiding square column 1, the side of guiding square column 1 are provided with U type groove
11, it is oriented on square column 1 and is arranged with nut seat 2, if nut seat 2, which passes through bearing close to the surrounding of guiding square column 1, is equipped with dry milling
Cylinder 21 or several idler wheels 22, roller 21 and idler wheel 22 are contacted with the surface of guiding square column 1；Lead screw 3 is arranged in U type groove 11,
Lead screw 3 is threaded with nut 4, and the both ends of lead screw 3 are connect with guiding square column 1 by bearing；Ten thousand are arranged on the lead screw 3
To bearing seat mechanism 5, one end of universal bearing seat mechanism 5 is fixed on nut seat 2, the other end of universal bearing seat mechanism 5 with
Nut 4 connects；Servo-actuated torsion seat mechanism 6 is further fixed on nut seat 2, the other end of servo-actuated torsion seat mechanism 6 is clamped in nut 2
On.
Since the roller 21 or idler wheel 22 of 2 surrounding of nut seat are contacted with guiding square column 1, then nut seat 2 generates certain inclination
When, guiding square column 1 can also tilt together.Due to lead screw 3 both ends with guiding square column 1 connect by bearing, then lead screw 3 understand with
Guiding square column 1 tilts together.The universal bearing seat mechanism 5 being arranged on lead screw 3 can the inclination of draw nut 4.Therefore lead screw 3 and nut
4 can be substantially coaxial.Universal bearing seat mechanism 5 is sheathed on lead screw 3, then universal bearing seat mechanism 5 is from each to right of whole circumference
Nut 4 is drawn, and is avoided nut seat 2 and is directly consolidated the case where timing nuts 4 is drawn by unilateral side always with nut 4.It is universal
Bearing seat mechanism 5 is drawn from each to nut 4, and the centering that can further improve nut 4 and lead screw 3 carries out height.Torsion
While seat mechanism 6 limits the rotation of nut 4, it is also ensured that the subtle movement of 4 opposing nut seat of nut 2 during nut 4 adjusts is protected
Card nut 4 can follow lead screw 3 to adjust in real time.The gravity of nut seat 2 can be substantially distributed on universal bearing seat mechanism 5, be facilitated
The case where nut 4 and 3 centering of lead screw, nut 4 and lead screw 2 are difficult to centering when nut 4 being avoided to be fixedly connected with nut seat 2.Nut 4
The case where after the accurate centering of lead screw 3, nut 4 can be moved steadily, and reduction is shaken or the movement of nut 4 is obstructed.
Embodiment two
On the basis of example 1, the universal bearing seat mechanism 5 includes bearing block 51, and bearing block 51 is sheathed on lead screw
On 3, the lower end of bearing block 51 is fixed with concave spherical surface seat 52, and 52 lower end of concave spherical surface seat is arranged with convex spherical seat 53, concave spherical surface seat 52
Be sheathed on lead screw 3 with convex spherical seat 53, the lower end of convex spherical seat 53 is fixed with several pillars 54, the other end of pillar 54 with
Nut 4 connects, and several pillars 54 are distributed on the circumference centered on the center line of nut 4.
The gravity of nut seat 2 pass sequentially through bearing base 51, concave spherical surface seat 52, convex spherical seat 53, pillar 54 and act on spiral shell
On mother 4.When nut 4 generates subtle offset relative to lead screw 3, under the blocking of concave spherical surface seat 52, convex spherical seat 53 can be in time
Return, so that pillar 54 pulls 4 return of nut, nut 4 and the accurate centering always of lead screw 3.
Embodiment three
On the basis of embodiment one or embodiment two, anti-fall nut is provided between the convex spherical seat 53 and nut 4
7, anti-fall nut 7 is threadedly coupled with lead screw 3, and several through-holes are provided on anti-fall nut 7, and pillar 54 is sheathed in through-hole.
Anti-fall nut 7 device work normally when with 4 one lifting of nut without carry, but when nut 4 due to mill
When loss effect, anti-fall nut 7 bears axial load and prevents weight from falling, and plays the role of safeguard protection.
Example IV
On the basis of above-mentioned any one embodiment, connected between the upper end and convex spherical seat 53 of the anti-fall nut 7
There is upper floating spring 71, is connected with lower floating spring 72 between the lower end and nut 4 of anti-fall nut 7.
By being separately connected upper floating spring 71 and lower floating spring 72 at the both ends of anti-fall nut 7, so that working normally
When anti-fall nut 7 can be moved together with nut 4 without loaded, avoid anti-fall nut 7 cause nut 4 mobile because loaded by
The case where resistance.
Embodiment five
On the basis of above-mentioned any one embodiment, the quantity of the pillar 54 is no less than three.Three pillars 54 are equal
Be distributed on the circumference centered on the center line of nut 4, then when convex spherical seat 53 adjusts position, on the circumferencial direction of nut 4 by
The case where power is uniform, is difficult to when reducing 4 unbalance stress of nut with 3 centering of lead screw.
Embodiment six
On the basis of above-mentioned any one embodiment, the servo-actuated torsion seat mechanism 6 includes slide 61,61 water of slide
Plain cloth is set, and sliding block 62 is arranged in slide 61, and slide opening is provided on sliding block 62, and slide post 63, slide post 63 are arranged in slide opening
On be fixed with U-shaped folder block 64, U-shaped folder block 64 is clamped on nut 4.
U-shaped folder block 64 can limit the rotation of nut 4, guarantee that nut 4 is steadily gone up and down.Sliding block 62 can slide in slide 61, sliding
Dynamic column 63 can move in slide opening, then nut 4 can move in two mutually orthogonal directions relative to nut seat 2 in the horizontal plane
It is dynamic, so that nut 4 adapts to the adjustment of universal bearing seat mechanism 5, guarantee that nut 4 is adjusted to and 3 centering of lead screw in time.
Embodiment seven
On the basis of above-mentioned any one embodiment, the upper end of the U-shaped folder block 64 is provided with card slot, is arranged in card slot
There is spring core rod 65, the other end and nut 4 of spring core rod 65 are fixed, are arranged with support spring 66 on spring core rod 65, support
Spring 65 is connected between nut 4 and U-shaped folder block 64.
Support spring 66 can link together U-shaped folder block 64 and nut 4, and allow U-shaped folder block 64 relative to nut
4 generate certain sliding, and stress between U-shaped folder block 64 and nut 4 is avoided to concentrate.
Claims (7)
1. a kind of Self-aligning safe spin lifting device, including guiding square column (1), the side of guiding square column (1) are provided with U-type groove
(11), it is oriented on square column (1) and is arranged with nut seat (2), nut seat (2) is pacified by bearing close to the surrounding of guiding square column (1)
If roller (21) and idler wheel (22) are contacted with the surface of guiding square column (1) equipped with dry drum (21) or several idler wheels (22)；U
Is arranged with lead screw (3) in type groove (11), lead screw (3) is threaded with nut (4), the both ends of lead screw (3) with guiding square column (1)
It is connected by bearing；It is characterized in that, being arranged with universal bearing seat mechanism (5), universal bearing seat mechanism on the lead screw (3)
(5) one end is fixed on nut seat (2), and the other end of universal bearing seat mechanism (5) is connect with nut (4)；On nut seat (2)
It is further fixed on servo-actuated torsion seat mechanism (6), the other end of servo-actuated torsion seat mechanism (6) is clamped on nut (2).
2. a kind of Self-aligning safe spin lifting device according to claim 1, which is characterized in that the universal bearing seat
Mechanism (5) includes bearing block (51), and bearing block (51) is sheathed on lead screw (3), and the lower end of bearing block (51) is fixed with concave spherical surface
Seat (52), concave spherical surface seat (52) lower end are arranged with convex spherical seat (53), and concave spherical surface seat (52) and convex spherical seat (53) are sheathed on
On lead screw (3), the lower end of convex spherical seat (53) is fixed with several pillars (54), and the other end of pillar (54) is connect with nut (4),
Several pillars (54) are distributed on the circumference centered on the center line of nut (4).
3. a kind of Self-aligning safe spin lifting device according to claim 2, which is characterized in that the convex spherical seat
(53) it is provided between nut (4) anti-fall nut (7), anti-fall nut (7) is threadedly coupled with lead screw (3), on anti-fall nut (7)
Several through-holes are provided with, pillar (54) is sheathed in through-hole.
4. a kind of Self-aligning safe spin lifting device according to claim 3, which is characterized in that the anti-fall nut
(7) be connected with floating spring (71) between upper end and convex spherical seat (53), the lower end and nut (4) of anti-fall nut (7) it
Between be connected with lower floating spring (72).
5. a kind of Self-aligning safe spin lifting device according to claim 2, which is characterized in that the pillar (54)
Quantity is no less than three.
6. a kind of Self-aligning safe spin lifting device described in any one according to claim 1~5, which is characterized in that institute
Stating servo-actuated torsion seat mechanism (6) includes slide (61), and slide (61) is horizontally disposed, is arranged with sliding block (62) in slide (61), sliding
It is provided with slide opening on block (62), is arranged in slide opening slide post (63), U-shaped folder block (64), U-shaped folder are fixed on slide post (63)
Block (64) is clamped on nut (4).
7. a kind of Self-aligning safe spin lifting device according to claim 6, which is characterized in that the U-shaped folder block
(64) upper end is provided with card slot, is arranged in card slot spring core rod (65), and the other end of spring core rod (65) and nut (4) are solid
It is fixed, be arranged on spring core rod (65) support spring (66), support spring (65) be connected to nut (4) and U-shaped folder block (64) it
Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811084406.7A CN109019423B (en) | 2018-09-18 | 2018-09-18 | Self-aligning safety spiral lifting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811084406.7A CN109019423B (en) | 2018-09-18 | 2018-09-18 | Self-aligning safety spiral lifting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109019423A true CN109019423A (en) | 2018-12-18 |
| CN109019423B CN109019423B (en) | 2020-01-17 |
Family
ID=64622458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811084406.7A Active CN109019423B (en) | 2018-09-18 | 2018-09-18 | Self-aligning safety spiral lifting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109019423B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716484A (en) * | 2021-09-13 | 2021-11-30 | 扬州工业职业技术学院 | Lift for engineering |
| KR102465545B1 (en) * | 2022-07-25 | 2022-11-11 | (주)에스제이오토메이션 | Lifter using screw-jack |
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| US3339892A (en) * | 1966-06-03 | 1967-09-05 | Duff Norton Co | Jack mechanism |
| CN2250392Y (en) * | 1996-04-09 | 1997-03-26 | 李学昌 | Automatic aligning device for parking equipment |
| JP2003307264A (en) * | 2002-04-16 | 2003-10-31 | Koyo Thermo System Kk | Ball screw type moving device |
| CN102285460A (en) * | 2011-06-03 | 2011-12-21 | 蒂森克虏伯机场***(中山)有限公司 | Electromechanically lifting driven underneath type electromechanical bridge |
| CN102472376A (en) * | 2009-09-28 | 2012-05-23 | 日立建机株式会社 | Linear actuator |
| CN102556893A (en) * | 2012-03-05 | 2012-07-11 | 泰州海陵液压机械有限公司 | Lead screw type electric lifting device |
| CN108468771A (en) * | 2018-04-13 | 2018-08-31 | 武汉理工大学 | A kind of ball guide screw nat pretightning force self-regulation device |
-
2018
- 2018-09-18 CN CN201811084406.7A patent/CN109019423B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3339892A (en) * | 1966-06-03 | 1967-09-05 | Duff Norton Co | Jack mechanism |
| CN2250392Y (en) * | 1996-04-09 | 1997-03-26 | 李学昌 | Automatic aligning device for parking equipment |
| JP2003307264A (en) * | 2002-04-16 | 2003-10-31 | Koyo Thermo System Kk | Ball screw type moving device |
| CN102472376A (en) * | 2009-09-28 | 2012-05-23 | 日立建机株式会社 | Linear actuator |
| CN102285460A (en) * | 2011-06-03 | 2011-12-21 | 蒂森克虏伯机场***(中山)有限公司 | Electromechanically lifting driven underneath type electromechanical bridge |
| CN102556893A (en) * | 2012-03-05 | 2012-07-11 | 泰州海陵液压机械有限公司 | Lead screw type electric lifting device |
| CN108468771A (en) * | 2018-04-13 | 2018-08-31 | 武汉理工大学 | A kind of ball guide screw nat pretightning force self-regulation device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716484A (en) * | 2021-09-13 | 2021-11-30 | 扬州工业职业技术学院 | Lift for engineering |
| KR102465545B1 (en) * | 2022-07-25 | 2022-11-11 | (주)에스제이오토메이션 | Lifter using screw-jack |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109019423B (en) | 2020-01-17 |
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