CN201647854U - Novel crane - Google Patents
Novel crane Download PDFInfo
- Publication number
- CN201647854U CN201647854U CN2009201533309U CN200920153330U CN201647854U CN 201647854 U CN201647854 U CN 201647854U CN 2009201533309 U CN2009201533309 U CN 2009201533309U CN 200920153330 U CN200920153330 U CN 200920153330U CN 201647854 U CN201647854 U CN 201647854U
- Authority
- CN
- China
- Prior art keywords
- crane arm
- crane
- fixed pulley
- arm
- framed structure
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Jib Cranes (AREA)
Abstract
A novel crane adopts a wire rope to pull the crane arm in variable amplitudes. A fixed pulley block is fixed in the front of the last block of the crane arm. And in a rotary platform is provided a framework structure the upper part of which is also fixed a fixed pulley block. A hydraulic oil cylinder is hinged in the framework structure which is wider than the crane arm and a bit longer than the crane arm being fully withdrawn. The framework structure can be put in the two sides of the crane arm. A wire rope is used to traverse the fixed pulley block in the framework and the fixed pulley block in the front of the crane arm. By using hoister to pull the wire rope for changing the distance of the two fixed pulley blocks or by using hydraulic oil cylinder to adjust the relative rotary platform angle of the framework structure, variable amplitudes are thus achieved due to the fact that the changeable distance between the two pulley blocks has no impact on the stretching or retracting of the crane arm. The wire rope pulls the crane arm to achieve variable amplitudes, which makes the crane arm only bear the axial compressive stress without a need to bear the bending moment in the crane arm vertical direction due to the heavy objects or the crane arm itself. Thus the lifting weight can be increased by times.
Description
Technical field: this novel hoisting crane is a movable crane.
Background technology: the present movable crane that uses, classify by crane arm: truss structure and box telescopic arm structure are arranged.Truss structure adopts crawler belt or wheeled car as the carried and transported instrument more, and the box telescopic arm structure adopts wheeled car as the carried and transported instrument.
The goliath great majority are the truss structure hoisting crane, but need huge fleet's transportation truss crane arm, balance weight iron even tracked machine decomposed transportation, arrive the camp site, need get up all detail assemblys, waste time and energy, need a lot of people to finish together, also need another hoisting crane help assembling, and shift new camp site, all decompose again and be transported to new camp site, from new assembling,, be not suitable for the working environment that the place changes at any time again though this truss structure hoisting capacity is big, reach the spot and to devote oneself to work rapidly
Box telescopic arm crane more piece crane arm is sleeved on together, volume is little, adjust the flexible and amplitude of jib by the piston motion of hydraulic actuating cylinder, except balance weight iron, all component all is installed on the same wheeled car, do not need huge fleet and a lot of staff, reach the spot and can devote oneself to work at once, time saving and energy saving.Shift work-yard and rapidly, but along with the increase of lifting weight, crane arm must satisfy certain intensity, the requirement of rigidity and stability, so crane arm is made increasingly, more and more heavier, also need to overcome own wt, directly have influence on lifting weight, and carrying carried and transported vehicle volume is increasing, weight is more and more heavier, and cost is more and more higher, with lifting weight be out-of-proportion, and equal lifting weight the truss structure crane arm to compare the box telescopic arm structure light
Therefore the truss structure crane arm can be made into the hoisting crane of big lifting weight.
Two kinds of structure crane arm lifting weight have so big contrast, we are from the mechanics angle analysis, the truss structure crane arm, use the wire rope inclined-pulling luffing, only bear axial compression effort, and box-structure crane arm hydraulic actuating cylinder luffing, crane arm not only will bear axial compression effort, also to bear weight and focus on vertical hoisting arm direction certainly the moment of flexure that crane arm produced, the crane arm very big to length-diameter ratio, the moment of flexure that crane arm produced plays a leading role.
Summary of the invention: the advantage of two kinds of crane arms that the utility model is crane integrated, kept the box telescopic boom, the advantage of hydraulic luffing hoisting crane, be convenient to shift the work-yard, devote oneself to work rapidly, time saving and energy saving, do not need a lot of staff and huge transport column, the characteristics that kept the truss crane structure again, increase lifting weight that can be at double than the hydraulic luffing hoisting crane at the hoisting crane of same lifting weight, can significantly reduce the weight of crane arm, reduce the weight of vehicle, can make goliath.
The technical scheme that the utility model hoisting crane is adopted is: box telescopic arm structure crane arm, hydraulically extensible, steel rope pulling crane arm luffing, and change box crane arm is stressed, make crane arm only bear axial compression effort, and do not bear weight and focus on vertical hoisting arm direction certainly moment of flexure that crane arm produced.But steel wire luffing structure is different from truss structure again, because the every joint length of truss is fixed, assembling back length is fixed, therefore length of steel wire rope is fixed, but the length of box telescopic boom crane arm is unfixing, along with working environment changes, can not adopt the fixedly rope luffing of truss crane arm, necessary length of steel wire rope is variable.The utility model hoisting crane is in the front portion of the last joint of crane arm a fixed pulley group to be installed, one framed structure is arranged above the turn table, a fixed pulley group is installed above framed structure, a hinged hydraulic ram on the framed structure, framed structure is wide compared with weighing arm, slightly long when also all regaining compared with weighing arm, can be placed on the both sides of crane arm, with fixed pulley group on the steel wire penetrating framework and crane arm fwd fixed pulley group, change up and down distance between two fixed pulley groups by winch pulling steel rope, or adjust the relative turn table angle of framed structure by hydraulic ram, reach luffing.Like this during the length variations of crane arm, the distance between two assembly pulleys can be adjusted, and has adapted to the variation of boom length.
The hoisting crane basic arm is hinged on the turn table, multi-stage telescopic arms is sleeved in the basic arm, it is flexible that hydraulic ram promotion multi-stage telescopic arms is housed in the crane arm, the winch that surges is contained in the turn table, framed structure is hinged on the turn table, the top connects a connecting rod or steel rope is fixed on the turn table, framed structure is wide compared with weighing arm, slightly long when also all regaining compared with weighing arm, can be placed on the both sides of basic arm, do not account for too large space, do not increase height yet, be convenient to transportation, the framed structure top is equipped with a fixed pulley group, framed structure and turn table are angled, framed structure, pull bar (steel rope), turn table is formed a triangular structure, a hinged hydraulic ram on the framed structure, front portion (top or side) at the last joint of crane arm increases a fixed pulley group, the fixed pulley group of steel wire penetrating framed structure fixed pulley group and the last Jie Xinjia of crane arm, form assembly pulley system, shrink or decontrol steel rope by winch and change up and down distance between two assembly pulleys, change the elevation angle luffing of crane arm, or adjust assembly pulley system adjusts crane arm with respect to the angle of turn table luffing by hydraulic ram, when telescopic boom, the distance of two fixed pulley groups can be adjusted at any time, and do not influence steel rope to lifting restriction highly, do not influence the luffing of crane arm yet, and the truss structure hoisting crane need be placed on ground to crane arm when increasing or reduce boom length, after middle the decomposition, increase or reduce the joint number of crane arm, the luffing steel rope also must increase or reduce, and the length that increases or reduce is fixed value, and novel hoisting crane has overcome this shortcoming, can be length arbitrarily
Illustrate below by mathematical computations: (is example with Fig. 1)
A certain hoisting crane, crane arm are the box telescopic arm structure, and hydraulically extensible, basic arm are the 500mm square structure, thickness is the 5mmQ235-A steel, and length is 11 meters, and three joint telescopic booms adopt same steel, length also is 11 meters, and fully extended length is 41 meters, (10 meters of every joint extension elongations)
(1) adopts hydraulic ram luffing (Fig. 4)
(2) adopt steel rope pulling crane arm luffing (as Fig. 1,2,3)
Calculate the lifting weight that 80 ° of telescopic booms of maximum elevation go out entirely
Basic arm quality ρ V=7.8 * 10
3(0.5
2-0.49
2)=949.42kg
First segment telescopic boom ρ V=7.8 * 10
3(0.49
2-0.48
2)=832.26kg
Second joint telescopic boom ρ V=7.8 * 10
3(0.48
2-0.47
2)=815.10kg
The 3rd joint telescopic boom ρ V=7.8 * 10
3(0.47
2-0.46
2)=797.94kg
Total mass is 3294.72kg
(1) a. axial force
Material maximum stress 235MPa
F1＝mgcos10°＝0.9848mg
Area is by minimum telescopic boom computation of areaBZ: S=0.47
2-0.46
2=0.0093m
2
Power F2=3294.72 * g * cos10 °=the 3244.64g that deadweight produces
σ＝(F1+F2)/S＝(0.9848mg+3244.64g)/0.0093＝235×10
6
M=223.157 * 10
3The kg=223.157 ton
B. moment of flexure
Weight acts on power F1=mgsin10 °=0.1730mg of crane arm vertical direction
Deadweight acts on power F2=mgsin10 °=3294.72 * 9.8 of crane arm vertical direction
0.1730＝5585.87
Maximal bending moment results from 5.5 meters of fulcrum, and F1 moment length is that 35.5 meters F2 moment length are 15 meters
M＝F1×35.5+F2×15＝60.1867×g+5585.87×15＝60.1867m+83788.025
I＝∫y
2dA＝[0.5(0.5
3-0.49
3)/12]+[0.49
3(0.5-0.49)/12]＝4.043×10
-4
W＝I/ymax＝(4.043×10
-4)/0.25＝1.6172×10
-3
σ＝M/W＝(60.1867m+83788.025)/1.617210
-3
M=4.922 * 10
3The kg=4.922 ton
Calculating can find out that moment of flexure plays a leading role in hoisting operation, though the shape of crane arm has ellipse and polygon at present, be subjected to the restriction of metal strength, and lifting weight increases limited
(2) axial force
F1＝mgsin10°/tgα+mg?cos10°＝0.6700mg+0.9848mg＝1.6548mg
F2＝3294.72×g×cos10°＝3244.64g＝31797.48
I＝4.043×10
-4
i＝√(I/A)＝√(4.043×10
-4)/0.0093＝√0.04347＝0.2085
λ＝μl/I＝1×41/0.2085＝196.64
λ＞(λp＝100)
σcr＝π
2E/λ2＝(3.14
2×2×10
5)/(196.64)
2＝51MPa
Crane arm unstability when not reaching the limit of axial force 235MPa, when therefore calculating lifting weight, the stress calculation in the time of should be by unstability.
∑cr＝(F1+F2)/S＝(1.6548mg+31797.48)/0.0093＝51×10
6
The m=27286kg=27.286 ton
The lifting weight ratio 27.286/4.922=5.54 of two kinds of crane amplitude variation structures doubly
Can find out from calculating: the lifting weight of the utility model hoisting crane is 5.54 times of the lifting weight of hydraulic luffing hoisting crane, therefore the utility model hoisting crane is more suitable for making large-scale telescopic boom box hoisting crane, and the advantage of box telescopic boom hydraulic luffing hoisting crane is arranged, and can alleviate the weight of crane arm for hoisting crane the utility model of identical lifting weight, alleviate the weight of vehicle, can save substantial contribution
This calculating is the conclusion that calculates at 80 ° of maximum elevations, and can become bigger being lower than 80 ° of elevation angle moments of flexure of utility model hoisting crane, and lifting weight will reduce, and the amplitude that the utility model hoisting crane lifting weight reduces is compared little.
Calculate the lifting weight that 60 ° of telescopic booms of maximum elevation go out entirely
(1)σcr＝(mg×0.5×35.5+3294.72×.5×15×9.8)/1.617210
-3
＝235×10
6
＝(173.95m+242161.92)/1.617210
-3＝235×10
6
m＝792.64kg
(2)σcr＝F/S＝[(0.816mg+0.5mg/tgα)+3294.72×9.8×0.866]/0.0093
＝(27.46m+27961.63)/0.0093＝51×10
6
The m=16254kg=16.254 ton
The lifting weight ratio of two kinds of crane amplitude variation structures: 16.254/0.793=20.4 doubly
Can find out that from calculating the utility model hoisting crane has bigger lifting weight.
Calculate maximum lifting weight (telescopic boom is not stretched out at 80 ° of elevations angle)
(1) moment of flexure
Weight acts on the power of crane arm vertical direction
F1＝mgsin10°＝0.1730mg＝1.6954m
Deadweight acts on the power of crane arm vertical direction
F2＝mgsin10°＝3294.72×9.8×0.1730＝5585.87
Maximal bending moment results from 5.5 meters of fulcrum, and F1 moment length is that 11 meters F2 moment length are 0 meter
M＝F1×11＝1.6954m×11＝18.65m
I＝∫y
2dA＝[0.5(0.5
3-0.46
3)/12]+[0.46
3(0.5-0.46)/12]＝1.4772×10
-3
W＝I/ymax＝(1.4772×10
-3)/0.25＝5.9088×10
-3
σ＝M/W＝18.65m/5.9088×10
-3＝235×10
6
M=74.454 * 10
3The kg=74.454 ton
(2) axial force
F1＝mgsin10°/tgα+mg?cos10°＝0.6700mg+0.9848mg＝1.6548mg
F2＝3294.72×g×cos10°＝3244.64g＝31797.48
I＝1.4772×10
-3
A＝0.5
2-0.46
2＝0.0384m
2
i＝√(I/A)＝√(1.4772×10
-3)/0.0384＝√0.03847＝0.196
λ＝μl/I＝1×11/0.196＝56.12
λ＜(λp＝100)
σcr＝a-bλ
2＝235-0.00668×56.12
2＝213.96MPa
σcr＝(1.6548mg+31797.48)/0.0384＝213.96×10
6
The m=504670.8kg=504.67 ton
The lifting weight ratio of two kinds of crane amplitude variation structures: 504.67/74.454=6.778 doubly
Can find out from top calculating, novel hoisting crane can be at double than hydraulic luffing hoisting crane increase lifting weight, can hold (as figure six) crane arm with the steel rope of adjustable length at the four sides of crane arm, can increase the stability of crane arm, also can on the lifting weight multiple that has increased, increase lifting weight again.
Originally the beneficial effect of novel hoisting crane is,
1, the increase lifting weight that novel hoisting crane can be at double with respect to hydraulic lift can be created profit more.
2, compare hoisting crane with the hydraulic luffing of lifting weight, the weight saving of crane arm, laid down cost is saved in vehicle weight saving, economizes on the use of funds.
3, can build goliath, occupy the market of truss structure hoisting crane, for enterprise creates profit more.
4, this novel hoisting crane available hydraulic luffing hoisting crane is transformed.
5, this novel crane structure is simple, and lifting weight is big, high efficiency.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
The different structure of Fig. 1,2, the novel hoisting crane of 3 steel ropes pulling crane arm luffing structure.
Fig. 4 hydraulic luffing hoisting crane.
The novel hoisting crane force analysis of Fig. 5.
Fig. 6 hydraulic luffing hoisting crane force analysis.
Fig. 7 increases crane arm stability steel cord structure.
Hoist rope 2, lifting hook 3, luffing steel rope 4, connecting rod 5, crane arm 6, winch 7, winch 8, turn table 9, framed structure 10, hydraulic ram 11, hoist rope 12, fixed pulley group 13, fixed pulley group 14, connecting rod 15, pulley 16, pulley 17, articulation piece 18, articulation piece 19, hydraulic ram 20, connecting rod 21, connecting rod 22, connecting rod 23, support link 24, crane arm 25, steel rope in the drawings 1,
The specific embodiment
In Fig. 1, framed structure (9) articulation piece (18) is hinged on the turn table (8), framed structure (9) is fixed on the turn table (18) with connecting rod (4), hydraulic ram (10) is connected between framed structure (9) and the turn table (8), a fixed pulley group (12) is installed above the framed structure (9), the connecting rod (14) of using foremost at crane arm connects a fixed pulley group (13), steel rope (3) passes fixed pulley group (12) fixed pulley group (13), the distance of adjusting between fixed pulley group (12) the fixed pulley group (13) by winch (6) scrolling steel rope (3) realizes luffing, also can adjust hydraulic ram (10) and adjust framed structure (9) and rotate around articulation piece (18) with respect to turn table (8) and realize luffing.
In another embodiment shown in Figure 2, framed structure (9) is articulated in the top of hydraulic ram (19) by articulation piece (18), hydraulic ram (19) is hinged on the turn table (8), framed structure (9) is hinged on turn table (8) with same articulation piece (22) with connecting rod (20) and connecting rod (21), a fixed pulley group (12) is installed above the framed structure (9), the connecting rod (14) of using foremost at crane arm connects a fixed pulley group (13), steel rope (3) passes the distance that fixed pulley group (12) fixed pulley group (13) adjusts between fixed pulley group (12) the fixed pulley group (13) by winch (6) scrolling steel rope (3) and realizes luffing, can adjust also that hydraulic ram (10) is adjusted framed structure (9) and connecting rod (20) rotates the realization luffing with the triangular form structure that connecting rod (21) is formed around articulation piece (22).
In another embodiment shown in Figure 3, framed structure (9) and hydraulic ram (19) are articulated on crane arm (5) basic arm by articulation piece (18), framed structure (9) is connected with connecting rod (22) with crane arm (5) basic arm, a fixed pulley group (12) is installed above the framed structure (9), the connecting rod (14) of using foremost at crane arm connects a fixed pulley group (13), steel rope (3) passes fixed pulley group (12) fixed pulley group (13), and modulated pressure oil cylinder (19) is adjusted the triangular form structure of framed structure (9) and crane arm (5) basic arm and connecting rod (22) composition and rotated the realization luffing around articulation piece (17).Must guarantee that crane arm (5) can not produce moment of flexure.
In Fig. 7, crane arm (24) is held each joint crane arm by strut bar (23) and steel rope (25), can increase the stability of crane arm.
Claims (3)
1. novel hoisting crane, it is characterized in that: adopt steel rope pulling crane arm luffing, a fixed pulley group is installed in front portion at the last joint of crane arm, one framed structure is arranged above the turn table, a fixed pulley group is installed above framed structure, a hinged hydraulic ram on the framed structure, framed structure is wide compared with weighing arm, slightly long when also all regaining compared with weighing arm, can be placed on the both sides of crane arm,, change up and down distance between two fixed pulley groups by winch pulling steel rope with fixed pulley group and the crane arm fwd fixed pulley group on the steel wire penetrating framework, or adjust the relative turn table angle of framed structure by hydraulic ram, reach luffing.
2. novel hoisting crane according to claim 1 is characterized in that: framed structure is hinged on the turn table, and the top connects a connecting rod or steel rope is fixed on the turn table.
3. novel hoisting crane according to claim 1 is characterized in that: the four sides wire rope inclined-pulling of crane arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201533309U CN201647854U (en) | 2009-06-14 | 2009-06-14 | Novel crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201533309U CN201647854U (en) | 2009-06-14 | 2009-06-14 | Novel crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201647854U true CN201647854U (en) | 2010-11-24 |
Family
ID=43113084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201533309U Expired - Fee Related CN201647854U (en) | 2009-06-14 | 2009-06-14 | Novel crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201647854U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767380A (en) * | 2012-08-08 | 2012-11-07 | 中联重科股份有限公司 | Box-shaped arm section of concrete sprayer, box-shaped arm support and concrete sprayer |
| CN103476670A (en) * | 2011-04-14 | 2013-12-25 | Ihc荷兰Ie有限公司 | Vessel comprising a crane |
| CN105392960A (en) * | 2013-07-03 | 2016-03-09 | Ihc荷兰Ie有限公司 | Vessel comprising a barge loading system |
| CN107086474A (en) * | 2017-06-26 | 2017-08-22 | 国网河南省电力公司濮阳供电公司 | A meter box installation assist device |
| CN107934803A (en) * | 2017-10-23 | 2018-04-20 | 芜湖市长江起重设备制造有限公司 | A kind of super lifting device for lifting equipment |
| CN110526138A (en) * | 2019-07-31 | 2019-12-03 | 中铁九桥工程有限公司 | A kind of amplitude variation type erecting crane |
| CN114275687A (en) * | 2021-12-28 | 2022-04-05 | 中铁四局集团电气化工程有限公司 | Single-arm adjustable multifunctional mechanical and electric material lifting device |
-
2009
- 2009-06-14 CN CN2009201533309U patent/CN201647854U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103476670A (en) * | 2011-04-14 | 2013-12-25 | Ihc荷兰Ie有限公司 | Vessel comprising a crane |
| CN103476670B (en) * | 2011-04-14 | 2016-08-31 | Ihc荷兰Ie有限公司 | Ship including crane |
| CN102767380A (en) * | 2012-08-08 | 2012-11-07 | 中联重科股份有限公司 | Box-shaped arm section of concrete sprayer, box-shaped arm support and concrete sprayer |
| CN102767380B (en) * | 2012-08-08 | 2016-02-24 | 中联重科股份有限公司 | Box-shaped arm section of concrete sprayer, box-shaped arm support and concrete sprayer |
| CN105392960A (en) * | 2013-07-03 | 2016-03-09 | Ihc荷兰Ie有限公司 | Vessel comprising a barge loading system |
| CN105392960B (en) * | 2013-07-03 | 2017-10-24 | Ihc荷兰Ie有限公司 | Include the ship of barge loading system |
| CN107086474A (en) * | 2017-06-26 | 2017-08-22 | 国网河南省电力公司濮阳供电公司 | A meter box installation assist device |
| CN107086474B (en) * | 2017-06-26 | 2022-08-02 | 国网河南省电力公司濮阳供电公司 | Meter box installation power assisting device |
| CN107934803A (en) * | 2017-10-23 | 2018-04-20 | 芜湖市长江起重设备制造有限公司 | A kind of super lifting device for lifting equipment |
| CN110526138A (en) * | 2019-07-31 | 2019-12-03 | 中铁九桥工程有限公司 | A kind of amplitude variation type erecting crane |
| CN114275687A (en) * | 2021-12-28 | 2022-04-05 | 中铁四局集团电气化工程有限公司 | Single-arm adjustable multifunctional mechanical and electric material lifting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201647854U (en) | Novel crane | |
| CN103848360B (en) | A kind of group tower tower crane being provided with packaged type balance weight system | |
| CN103030074A (en) | Hinge points-variable combined type multi-functional crawler crane | |
| CN105110213A (en) | Crane provided with counterweight balance mechanism adopting dead weight of hoisted object as well as crane transformation scheme | |
| CN201442833U (en) | Arm support lifting mechanism | |
| CN202945014U (en) | Lifting device for manual hole digging pile of building operation | |
| CN206088813U (en) | Heavy machinery hoists transfer device | |
| CN203728443U (en) | Combined tower crane with main and auxiliary boom structure | |
| CN207932939U (en) | a kind of multifunctional crane | |
| CN204474193U (en) | A kind of Pillar-fixing Type Slewing Crane | |
| CN102303821A (en) | Luffing tower crane with balanced type suspension arm based on traction luffing of steel rope | |
| CN104671133A (en) | Marine jib crane luffing structure | |
| CN202379648U (en) | Portable mobile crane | |
| CN202296907U (en) | Suspension arm balanced movable arm tower crane capable of luffing based on steel rope traction | |
| CN208218269U (en) | Manual balanced type folding crane | |
| CN203474321U (en) | Tower crane used for constructing and erecting electric transmission line iron towers | |
| CN206395750U (en) | A kind of storage station's trash rack overhauls boom hoisting | |
| CN101585489A (en) | Rail-mounted tower crane with combination arm and movable arm | |
| CN205527409U (en) | Portable hoist | |
| CN202322118U (en) | Rigid telescopic hydraulic separate counter weight crane | |
| CN215711280U (en) | Jacking device for variable cross-section tower crane | |
| CN116101914A (en) | Crane with crane body | |
| CN108408609A (en) | A kind of manual balanced type folding crane | |
| CN108529520A (en) | A kind of hydraulic lifting workbench | |
| CN208218274U (en) | Half electrodynamic balance formula folding crane |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20130614 |