CN104477793A - Superlift device of crane and crane - Google Patents
Superlift device of crane and crane Download PDFInfo
- Publication number
- CN104477793A CN104477793A CN201410776943.3A CN201410776943A CN104477793A CN 104477793 A CN104477793 A CN 104477793A CN 201410776943 A CN201410776943 A CN 201410776943A CN 104477793 A CN104477793 A CN 104477793A
- Authority
- CN
- China
- Prior art keywords
- line
- crane
- lifting device
- front drag
- super lifting
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
The invention provides a superlift device of a crane and the crane. The superlift device of the crane comprises a left mast and a right mast, a left front stay rope, a right front stay rope and a sidewise bending compensator, wherein the left mast and the right mast are arranged on a suspension arm of the crane; a first end of the left front stay rope is connected with the left mast; a first end of the right front stay rope is connected with the right mast; the sidewise bending compensator is installed on the suspension arm and is connected between a second end of the left front stay rope and a second end of the right front stay rope; when the stress difference values of the left front stay rope and the right front stay rope reach the preset value, the sidewise bending compensator displaces, and further the left front stay rope and the right front stay rope are linked to enable the suspension arm to be bent sidewise. The problem in the prior art that the suspension arm is easy to break when the superlift device is used for controlling the sidewise bending is solved by the technical scheme.
Description
Technical field
The present invention relates to technical field of engineering machinery, in particular to a kind of crane super lifting device and hoisting crane.
Background technology
At present, in order to meet the requirement of engineering construction, hoisting crane generally has the trend towards super-tonnage development.For this reason, the jib joint number of hoisting crane is on the increase, and length constantly increases, and hoisting capacity also constantly increases simultaneously.
Above-mentioned situation also exists following problem:
1, the design space of hoisting crane is limited, and arm 2 ' cross section cannot continue to strengthen, thus causes arm 2 ' amount of deflection large;
2, the arm 2 ' thickness of slab of hoisting crane is because of high strength steel die mould technological ability limitation, cannot continue to thicken, thus cause arm 2 ' stress large;
3, during hoisting crane work, finite space is made full use of, hoisting crane can be caused like this to there is local stability sex chromosome mosaicism.
For this reason, as shown in Figure 1, existing super-tonnage crane has set up super lifting device, to be used for reducing amount of deflection, reduces stress, improves hoisting capacity.But in the prior art, as shown in Figures 2 and 3, the both sides drag-line of super lifting device is independent each other, thus causes two side draws unequal.The Producing reason such as not grade of two side draws is as follows:
1, initial guy cable length is not etc., and when making arm 2 ' unloaded like this, pulling force is not etc.In the prior art, usually can control initial drag-line extension elongation;
2, after carrying there is side sway in arm 2 ' system.Side sway is otherwise known as plane of rotation amount of deflection, and its producing cause is roughly divided into following two kinds:
A, hoisting capacity reach certain numerical value, cause the structural distortion of arm 2 ' to produce deflection;
B, hoisting capacity do not reach maxim, but arm 2 ' in turning course because speed of revolutions is too fast, wind load or other load causes the structural distortion of arm 2 ' to produce deflection.
One of effect of super lifting device is exactly control side sway, but in prior art when controlling side sway, the drag-line of arm 2 ' both sides is not in carrying back pull etc.Thus cause being easy to when controlling arm 2 ' side sway control " excessive ", arm 2 ' system produces serpentine distortion, and then the phenomenon that can produce folding arm occurs.In order to prevent the generation of above-mentioned phenomenon, the effect of super lifting device can not play completely, to such an extent as to the hoisting capacity improved is limited.
Summary of the invention
Main purpose of the present invention is to provide a kind of crane super lifting device and hoisting crane, controls to solve super lifting device of the prior art the problem that the phenomenon of arm folding arm easily occurs side sway.
To achieve these goals, according to an aspect of the present invention, provide a kind of crane super lifting device, comprising: left mast and right mast, be arranged on the arm of hoisting crane; Left front drag-line, the first end of left front drag-line is connected with left mast; Right front drag-line, the first end of right front drag-line is connected with right mast, crane super lifting device also comprises: side sway compensator, side sway compensator is arranged on arm, side sway compensator is connected between the second end of left front drag-line and the second end of right front drag-line, when the stressed difference of left front drag-line and right front drag-line reaches preset value, side sway compensator can be subjected to displacement, and then left front drag-line and right front drag-line produce interlock to make arm generation side sway.
Further, side sway compensator comprises axle, and axle is connected between the second end of left front drag-line and the second end of right front drag-line.
Further, axle is provided with stopper section; Side sway compensator also comprises: right baffle-plate and right baffle plate, be fixedly installed on arm, and axle is located in right baffle-plate and right baffle plate movably, and stopper section is between right baffle-plate and right baffle plate; Left elastic component, is arranged between right baffle-plate and stopper section; Right elastic component, is arranged between right baffle plate and stopper section.
Further, stopper section is baffle ring.
Further, stopper section is equal with the distance at the two ends of axle.
Further, side sway compensator also comprises: for obtaining the position monitoring device of spindle displacement, position monitoring device is arranged on arm.
Further, position monitoring device is displacement pickup.
Further, stopper section have towards position monitoring device extend and with the tip of position monitoring device.
Further, left elastic component is the left spring be set in axle, and right elastic component is the right spring be set in axle.
According to a further aspect in the invention, provide a kind of hoisting crane, comprise crane super lifting device, crane super lifting device is above-mentioned crane super lifting device.
Apply technical scheme of the present invention, set up side sway compensator.When arm generation side sway, the stressed difference of left front drag-line and right front drag-line.Now, when the stressed difference of left front drag-line and right front drag-line reaches preset value, side sway compensator can be subjected to displacement according to the stressed of left front drag-line and right front drag-line, thus the length of left front drag-line and right front drag-line is changed in compensation range, and then make the stressed approximately equal all the time of left front drag-line and right front drag-line, avoid the side sway of arm to produce serpentine, while can allowing certain side sway operation, the problem of folding arm can not be produced.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of hoisting crane in prior art;
Fig. 2 shows the structural representation of the super lifting device of hoisting crane in prior art;
Fig. 3 shows the deformation schematic diagram of the super lifting device of Fig. 2;
Fig. 4 shows the structural representation according to hoisting crane of the present invention;
Fig. 5 shows the structural representation of the embodiment according to crane super lifting device of the present invention;
Fig. 6 shows the structural representation of the side sway compensator in Fig. 5;
Fig. 7 a shows the structural representation before the super lifting device carrying in Fig. 5;
Fig. 7 b shows the working state schematic representation of super lifting device of the prior art;
Fig. 7 c shows the working state schematic representation of the super lifting device in Fig. 5; And
Fig. 8 shows the working state schematic representation of the side sway compensator in Fig. 5.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
2 ', arm; 2, arm; 11, left back drag-line; 12, right back drag-line; 13, left mast; 14, right mast; 15, left front drag-line; 16, right front drag-line; 17, side sway compensator; 171, axle; 171a, stopper section; 172, right baffle-plate; 173, left elastic component; 174, right elastic component; 175, right baffle plate; 176, position monitoring device.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 4 and Figure 5, the crane super lifting device of the present embodiment comprises left mast 13, right mast 14, left front drag-line 15 and right front drag-line 16.Wherein, left mast 13 and right mast 14 are arranged on the arm 2 of hoisting crane.The first end of left front drag-line 15 is connected with left mast 13.The first end of right front drag-line 16 is connected with right mast 14.Crane super lifting device also comprises side sway compensator 17.Side sway compensator 17 is arranged on arm 2, side sway compensator 17 to be connected between the second end of left front drag-line 15 and the second end of right front drag-line 16 when the stressed difference of left front drag-line 15 and right front drag-line 16 reaches preset value, side sway compensator 17 can be subjected to displacement, and then left front drag-line 15 and right front drag-line 16 produce interlock to make arm 2 that side sway occur.
The crane super lifting device of application the present embodiment, has set up side sway compensator 17.When there is side sway in arm 2, the stressed difference of left front drag-line 15 and right front drag-line 16.Now, when the stressed difference of left front drag-line and right front drag-line reaches preset value, side sway compensator 17 can be subjected to displacement according to the stressed of left front drag-line 15 and right front drag-line 16, thus the length of left front drag-line 15 and right front drag-line 16 is changed in compensation range, and then make the stressed approximately equal all the time of left front drag-line 15 and right front drag-line 16, avoid the side sway of arm 2 to produce serpentine, while can allowing certain side sway operation, the phenomenon of folding arm can not be produced.
As shown in Figure 6, in the crane super lifting device of the present embodiment, side sway compensator 17 comprises axle 171, between the second end that axle 171 is connected to left front drag-line 15 and the second end of right front drag-line 16, axle 171 is provided with stopper section 171a.Side sway compensator 17 also comprises right baffle-plate 172, right baffle plate 175, left elastic component 173 and right elastic component 174.Wherein, right baffle-plate 172 and right baffle plate 175 are fixedly installed on arm 2, and axle 171 is located in right baffle-plate 172 and right baffle plate 175 movably, and stopper section 171a is between right baffle-plate 172 and right baffle plate 175.Left elastic component 173 is arranged between right baffle-plate 172 and stopper section 171a.Right elastic component 174 is arranged between right baffle plate 175 and stopper section 171a.
As shown in Figure 7, in normal operating conditions, each component part stretches to mode of operation hoisting crane by super lifting device, can be controlled the amount of deflection of arm 2 by left front drag-line 15, right front drag-line 16, left mast 13 and right mast 14.
In the prior art, before carrying, as shown in Figure 7a, the drag-line rope of left front drag-line 15 is long is L1, and the drag-line rope of right front drag-line 16 is long approximates F2 for L2, F1.After carrying, the drag-line rope of left front drag-line 15 and right front drag-line 16 is long to change.As the deflection maximum permissible value fb of the arm 2 reached shown in Fig. 7 b, the drag-line rope of left front drag-line 15 is long is L3, and the drag-line rope of right front drag-line 16 is long is L4, and F3>F4, and the difference of F3 and F4 increases gradually.Hang if now continue and carry, then can produce the arm 2 serpentine distortion in Fig. 7 b shown in dotted line, produce crane system unstability, structural failure, causes danger.
Side sway compensator 17 in the crane super lifting device of application the present embodiment, can allow arm 2 to produce certain side sway, and " excessive " of release side sway controls, protection arm.
Particularly, as shown in Fig. 6, Fig. 7 a, Fig. 7 c and Fig. 8, because F3>F4, left front drag-line 15 and right front drag-line 16 not to act on about the axial force of side sway compensator 17 not etc., after the difference of above-mentioned axial force reaches the difference load of compressible/draw springs, left elastic component 173 will be made to be compressed, and right elastic component 174 is stretched.After the effect of side sway compensator 17, as shown in Figure 7 c, the length of left front drag-line 15 is L5=L1+L ', the length of right front drag-line 16 is L6=L2-L ', and now the deflection of arm 2 is fc, and fc < fb, the side sway of such crane system then can not produce S shape, the distortion of arm 2 is out represented by dashed line in figure 7 c, and then prevents crane system from producing unstability, improves hoisting capacity.
As shown in Figure 6, in the crane super lifting device of the present embodiment, stopper section 171a is baffle ring.Baffle ring structure is simple, convenient installation.
As shown in Figure 6, in the crane super lifting device of the present embodiment, stopper section 171a is equal with the distance at the two ends of axle 171.Said structure makes to be positioned at the left elastic component 173 of 171a both sides, stopper section and right elastic component 174 is evenly distributed, stressed more even.
As shown in Figure 6 and Figure 8, in the crane super lifting device of the present embodiment, side sway compensator 17 also comprises the position monitoring device 176 for obtaining axle 171 displacement, and position monitoring device 176 is arranged on arm 2.Position monitoring device 176 is preferably displacement pickup.The quantity of displacement pickup can be arranged according to actual needs, can be one also can be multiple.When position monitoring device 176 detects that side sway exceedes compensation range, can signal be sent, cut off the action continuing lifting, stop hoisting operation, protect crane system.
As shown in Figure 6 and Figure 8, in the crane super lifting device of the present embodiment, stopper section 171a have towards position monitoring device 176 extend and with the tip of position monitoring device 176.Said structure makes the detection of position monitoring device 176 more accurate.
As shown in Figure 6 and Figure 8, in the crane super lifting device of the present embodiment, left elastic component 173 is for being set in the left spring in axle 171, and right elastic component 174 is for being set in the right spring in axle 171.Spring structure is simple, and elastic performance is good, cheap.
As shown in Figure 6 and Figure 8, in the crane super lifting device of the present embodiment, the first end of axle 171 has the first mounting hole for installing left front drag-line 15, and the second end of axle 171 has the second mounting hole for installing right front drag-line 16.Said structure is used for installing left front drag-line 15 and right front drag-line 16.
As shown in Figure 5, the crane super lifting device of the present embodiment also comprises left back drag-line 11 and right back drag-line 12.The first end of left back drag-line 11 is connected with left mast 13, and the first end of right back drag-line 12 is connected with right mast 14.Second end of left back drag-line 11 is all connected with arm 2 with the second end of right back drag-line 12.Wherein, left back drag-line 11 is arranged with left front drag-line 15 is independent, and right back drag-line 12 is arranged with right front drag-line 16 is independent.
From above description; can find out; the above embodiments of the present invention achieve following technique effect: side sway compensator 17 allows crane system to have certain side sway value; prevent the excessive generation unstability of side sway because arm 2 overloads, operates that speed of revolutions is too fast, wind load and other load cause; thus prevent arm 2 from folding arm occurring; protect crane system, and make can carry out hoisting operation in side sway compensation range, thus improve hoisting capacity.
Present invention also provides a kind of hoisting crane, the embodiment (not shown) according to the hoisting crane of the application comprises above-mentioned crane super lifting device.Owing to having above-mentioned crane super lifting device, the hoisting capacity of the hoisting crane of the present embodiment obtains significant raising.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a crane super lifting device, comprising:
Left mast (13) and right mast (14), be arranged on the arm (2) of hoisting crane;
Left front drag-line (15), the first end of described left front drag-line (15) is connected with described left mast (13);
Right front drag-line (16), the first end of described right front drag-line (16) is connected with described right mast (14),
It is characterized in that, described crane super lifting device also comprises:
Side sway compensator (17), described side sway compensator (17) is arranged on described arm (2), between the second end that described side sway compensator (17) is connected to described left front drag-line (15) and the second end of described right front drag-line (16), when the stressed difference of described left front drag-line (15) and described right front drag-line (16) reaches preset value, described side sway compensator (17) can be subjected to displacement, and then described left front drag-line (15) and described right front drag-line (16) produce interlock, to make described arm (2), side sway occur.
2. crane super lifting device according to claim 1, it is characterized in that, described side sway compensator (17) comprises axle (171), between the second end that described axle (171) is connected to described left front drag-line (15) and the second end of described right front drag-line (16).
3. crane super lifting device according to claim 2, is characterized in that,
Described axle (171) is provided with stopper section (171a);
Described side sway compensator (17) also comprises:
Right baffle-plate (172) and right baffle plate (175), be fixedly installed on described arm (2), described axle (171) is located in described right baffle-plate (172) and described right baffle plate (175) movably, and described stopper section (171a) is positioned between described right baffle-plate (172) and described right baffle plate (175);
Left elastic component (173), is arranged between described right baffle-plate (172) and described stopper section (171a);
Right elastic component (174), is arranged between described right baffle plate (175) and described stopper section (171a).
4. crane super lifting device according to claim 3, is characterized in that, described stopper section (171a) is baffle ring.
5. the crane super lifting device according to claim 3 or 4, is characterized in that, described stopper section (171a) is equal with the distance at the two ends of described axle (171).
6. the crane super lifting device according to claim 3 or 4, it is characterized in that, described side sway compensator (17) also comprises: for obtaining the position monitoring device (176) of described axle (171) displacement, described position monitoring device (176) is arranged on described arm (2).
7. crane super lifting device according to claim 6, is characterized in that, described position monitoring device (176) is displacement pickup.
8. crane super lifting device according to claim 6, is characterized in that, described stopper section (171a) have towards described position monitoring device (176) extend and with the tip of described position monitoring device (176).
9. crane super lifting device according to claim 3, it is characterized in that, described left elastic component (173) is for being set in the left spring in described axle (171), and described right elastic component (174) is for being set in the right spring in described axle (171).
10. a hoisting crane, comprises crane super lifting device, it is characterized in that, the crane super lifting device of described crane super lifting device according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410776943.3A CN104477793B (en) | 2014-12-15 | 2014-12-15 | Crane super lifting device and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410776943.3A CN104477793B (en) | 2014-12-15 | 2014-12-15 | Crane super lifting device and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104477793A true CN104477793A (en) | 2015-04-01 |
| CN104477793B CN104477793B (en) | 2016-08-24 |
Family
ID=52752441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410776943.3A Active CN104477793B (en) | 2014-12-15 | 2014-12-15 | Crane super lifting device and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104477793B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113582050A (en) * | 2021-07-30 | 2021-11-02 | 三一汽车起重机械有限公司 | Side bending correction device and method for crane boom and crane |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19802187C2 (en) * | 1998-01-16 | 1999-11-25 | Mannesmann Ag | Device for bracing a superlift device of a telescopic crane |
| US20020070187A1 (en) * | 2000-12-12 | 2002-06-13 | Liebherr-Werk Ehingen Gmbh | Automotive crane |
| US20110084043A1 (en) * | 2009-10-09 | 2011-04-14 | Liebherr-Werk Ehingen Gmbh | Crane |
| CN102659038A (en) * | 2012-05-17 | 2012-09-12 | 中联重科股份有限公司 | Crane and superlift device thereof |
| CN102745605A (en) * | 2012-07-12 | 2012-10-24 | 中联重科股份有限公司 | Control equipment, method, system and engineering machine for retractable rope compensation of guying device |
| CN102942127A (en) * | 2012-12-07 | 2013-02-27 | 中联重科股份有限公司 | Post-tensioning adjusting device and crane |
| CN103010969A (en) * | 2012-12-07 | 2013-04-03 | 中联重科股份有限公司 | Crane, guying mast and pulling pre-tightening device of guying mast |
| WO2013189154A1 (en) * | 2012-06-18 | 2013-12-27 | 湖南三一智能控制设备有限公司 | Method and device for improving lateral load capacity of arm support, and crane |
-
2014
- 2014-12-15 CN CN201410776943.3A patent/CN104477793B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19802187C2 (en) * | 1998-01-16 | 1999-11-25 | Mannesmann Ag | Device for bracing a superlift device of a telescopic crane |
| US20020070187A1 (en) * | 2000-12-12 | 2002-06-13 | Liebherr-Werk Ehingen Gmbh | Automotive crane |
| US20110084043A1 (en) * | 2009-10-09 | 2011-04-14 | Liebherr-Werk Ehingen Gmbh | Crane |
| CN102659038A (en) * | 2012-05-17 | 2012-09-12 | 中联重科股份有限公司 | Crane and superlift device thereof |
| WO2013189154A1 (en) * | 2012-06-18 | 2013-12-27 | 湖南三一智能控制设备有限公司 | Method and device for improving lateral load capacity of arm support, and crane |
| CN102745605A (en) * | 2012-07-12 | 2012-10-24 | 中联重科股份有限公司 | Control equipment, method, system and engineering machine for retractable rope compensation of guying device |
| CN102942127A (en) * | 2012-12-07 | 2013-02-27 | 中联重科股份有限公司 | Post-tensioning adjusting device and crane |
| CN103010969A (en) * | 2012-12-07 | 2013-04-03 | 中联重科股份有限公司 | Crane, guying mast and pulling pre-tightening device of guying mast |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113582050A (en) * | 2021-07-30 | 2021-11-02 | 三一汽车起重机械有限公司 | Side bending correction device and method for crane boom and crane |
| CN113582050B (en) * | 2021-07-30 | 2023-08-29 | 三一汽车起重机械有限公司 | Side bending correction device and method for crane boom and crane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104477793B (en) | 2016-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104192732A (en) | Crawler crane capable of performing double-hook lifting and structure design method thereof | |
| CN104649120A (en) | Balance hoisting equipment | |
| CN104477793A (en) | Superlift device of crane and crane | |
| CN203189389U (en) | Fixing structure of hydraulic oil cylinder guide sleeves and baffle rings | |
| CN209702171U (en) | A kind of fixed device of the anti-twisted rope of wirerope | |
| CN103434949B (en) | Super lifting device and crane | |
| CN204675703U (en) | A kind of hoisting crane of available protecting steel rope | |
| CN202644620U (en) | Self-dismounting apparatus of excavator counterweight | |
| CN204823892U (en) | High stability hoist | |
| CN204342333U (en) | The plain line rope guide of lifting mechanism of tower crane | |
| CN202379629U (en) | Super lifting device and crane | |
| CN204569238U (en) | Omnipotent bracing or strutting arrangement bottom a kind of tower crane | |
| CN202379643U (en) | Large tonnage crane and lifting mechanism thereof | |
| CN101654212A (en) | Safety device of gantry crane arm support | |
| CN202492304U (en) | Hinged point rotating device, installation structure of superlift pulling plate and whole ground crane | |
| CN103101843B (en) | A kind of lifting appliance | |
| CN204980969U (en) | European style hoist hoisting mechanism | |
| CN205099226U (en) | Waist rope device, cantilever crane supporting arrangement and hoist | |
| CN204434053U (en) | A kind of balance hanging device | |
| JP2016037342A (en) | crane | |
| CN212769552U (en) | Jacking safety protection device of tower crane | |
| CN101428733A (en) | Lifting machine of crane | |
| CN219507521U (en) | Variable amplitude arm head and crane thereof | |
| CN203021238U (en) | Winding drum structure of skip bucket elevator of preheating furnace | |
| CN203865883U (en) | Amplitude and height adjustable lifting rod for SC-type construction elevator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |