CN206735640U - Preventing gnawing rail device and beam-hanging traveling crane for beam-hanging traveling crane - Google Patents
Preventing gnawing rail device and beam-hanging traveling crane for beam-hanging traveling crane Download PDFInfo
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- CN206735640U CN206735640U CN201720373717.XU CN201720373717U CN206735640U CN 206735640 U CN206735640 U CN 206735640U CN 201720373717 U CN201720373717 U CN 201720373717U CN 206735640 U CN206735640 U CN 206735640U
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- Prior art keywords
- traveling crane
- vehicle frame
- vertical shift
- gnawing rail
- hanging traveling
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- 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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- 230000035929 gnawing Effects 0.000 title claims abstract description 49
- 230000000694 effects Effects 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 2
- 238000004873 anchoring Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
Abstract
A kind of preventing gnawing rail device, overhead traveling crane are the utility model is related to, belongs to Bridge Erector technical field, and in particular to a kind of preventing gnawing rail device, beam-hanging traveling crane for beam-hanging traveling crane.Including：Connecting cross beam, its both ends connect the hinged-support of chassis；Center hinge, its one end are fixedly connected in the middle part of crossbeam, and the other end is extend into the connecting hole in the middle part of vehicle frame end carriage.To ensure vertical shift chassis stress equalization and adapting to Bridge Erector horn side bending deformation, it is connected in the middle part of day vehicle carriage end carriage using center hinge with vertical shift chassis, vehicle frame main beam end is supported directly on vertical shift chassis.The preventing gnawing rail device energy adjust automatically adapts to gnaw rail, the automatic lateral force discharged between wheel and track, avoids gnawing rail for a long time.
Description
Technical field
A kind of preventing gnawing rail device, overhead traveling crane are the utility model is related to, belongs to Bridge Erector technical field, and in particular to one kind is used for
The preventing gnawing rail device and beam-hanging traveling crane of beam-hanging traveling crane.
Background technology
At present, the Bridge Erector of large-tonnage is using more and more extensive, and has that span is big, lifting capacity weight, lifting altitude are high, work
The features such as rank is high, this design for allowing for the beam-hanging traveling crane supporting with it become particularly important.It is particularly due to manufacture and pacifies
Fill error, overhead traveling crane traveling is easy to occur to gnaw rail phenomenon, it is regular it is prolonged gnaw rail not only can be to track, wheel, motor etc.
Relevant device causes very big damage, influences the safety and steady operation of equipment, and serious even also results in serious accident
Generation.
Essence of the method for rail except strictly controlling wheel and track in manufacture installation is gnawed from configuration aspects solution at present
It is outside one's consideration, also has and much set about from the wheel rim design of wheel, mainly there are following two schemes：One sidecar wheel is without wheel rim, another side car
Take turns as two-wheel edge；Two sidecar wheels are single-wheel edge.Two schemes can mitigate the phenomenon for gnawing rail only in certain scope, but can not
It is enough to avoid gnawing rail completely.Also some address the method for gnawing rail from control aspect, although this control device is in certain journey
The phenomenon for gnawing rail can be reduced on degree, but have that reliability is poor, maintaining difficulty is big, costly and stability is poor etc. to lack
Point.
Long span, big elevating capacity overhead traveling crane traveling are easier the phenomenon for gnawing rail occur, and traditional method is not enough to solve mesh
Rail phenomenon is gnawed in preceding appearance.
Therefore, the utility model proposes a set of compact-sized reasonable, easy to operate, safe and reliable beam-hanging traveling crane that is used for
Preventing gnawing rail device and beam-hanging traveling crane.The overhead traveling crane carries preventing gnawing rail device, can be when gnawing rail generation, and adaptive adjustment wheel is relative
In orbital position, the automatic lateral force discharged between wheel and track, avoid gnawing rail for a long time.
Principle or similar principle of the other preventing gnawing rail devices of the prior art more using installation horizontal guide sheave, control
The gap in outside is less than wheel rim and the gap in outside in track in directive wheel processed and track, when gnawing rail directive wheel and
Rail contact, so it is only capable of preventing wheel rim and rail contact, avoids the abrasion of wheel rim, can not eliminate and gnaw rail, and
And the side force of directive wheel and rail contact can not discharge, prolonged lateral impact can cause the fatigue rupture of steel construction, very
To the generation for causing security incident.
Utility model content
The utility model is mainly to solve the technical problem for gnawing rail present in prior art, there is provided one kind is used for hanging beam
The preventing gnawing rail device and beam-hanging traveling crane of overhead traveling crane, it is adaptive strong, can discharge the lateral force between wheel and track automatically,
Avoid gnawing rail for a long time.
The utility model further object is that solution preventing gnawing rail means reliability of the prior art is poor, maintaining is difficult
Spend the shortcomings of big, costly and stability is poor, it is proposed that a kind of preventing gnawing rail device and beam-hanging traveling crane for beam-hanging traveling crane, should
Overhead traveling crane or so vertical shift chassis is with vertical shift vehicle frame using form is flexibly connected, and installation operation is convenient, simple and compact for structure, vehicle frame end
Lower cover coordinates center hinge using either side of the small of the back hole and circular hole in the middle part of beam, can discharge due to vehicle frame main beam deformation and caused transverse direction
Displacement, safety guarantee are good.
Above-mentioned technical problem of the present utility model is mainly what is be addressed by following technical proposals：
A kind of preventing gnawing rail device for beam-hanging traveling crane, including：
Connecting cross beam, its both ends connect the hinged-support of chassis；
Center hinge, its one end are fixedly connected in the middle part of crossbeam, and the other end is extend into the connecting hole in the middle part of vehicle frame end carriage.
Optimization, set in the middle part of a kind of above-mentioned preventing gnawing rail device for beam-hanging traveling crane, at least side vehicle frame end carriage
Connecting hole is waist round hole.
Optimization, a kind of above-mentioned preventing gnawing rail device for beam-hanging traveling crane, the connection that vehicle frame end carriage middle part in side is set
Hole is waist round hole, and the connecting hole set in the middle part of opposite side vehicle frame end carriage is circular hole.
Optimization, a kind of above-mentioned preventing gnawing rail device for beam-hanging traveling crane, the polylith friction plate that hinged-support is provided with；Car
The flange board component lower end of frame girder lower cover end is provided with the stainless steel plate for directly being contacted with the friction plate.
Optimization, a kind of above-mentioned preventing gnawing rail device for beam-hanging traveling crane, vehicle frame main beam lower cover end be arranged at
Rubber blanket is provided between the flange board component of its lower end.
A kind of preventing gnawing rail beam-hanging traveling crane, including any of the above-described preventing gnawing rail device.
Optimization, a kind of above-mentioned preventing gnawing rail beam-hanging traveling crane, including：Separate unit beam-hanging traveling crane is by two across left and right Bridge Erector
The vehicle frame main beam of horn and the vehicle frame end carriage of left and right form vertical shift vehicle frame, vertical shift driving mechanism and two girder ends on vertical shift vehicle frame
Portion is connected using flange, and the girder top of vertical shift vehicle frame is provided with rail and provides support for cross traveling trolley, and end carriage lower support exists
It can make longitudinally running on vertical shift chassis, be provided with hoist engine assembly and the leading block group being located on cross traveling trolley on the outside of end carriage
The common motion for providing vertical direction, oblique pull anchor is located on the outside of rear beam-hanging traveling crane end carriage, common with vertical shift driving mechanism
Effect driving Bridge Erector horn vertical shift via.
Therefore, the utility model has the following advantages that：
1st, it is adaptive strong.When overhead traveling crane is during traveling, when there is gnawing rail in bogie wheels wheel rim and rail contact, rail
Road must have a reaction force acts on wheel, so as to pass to power by chassis power transmission to equalizer, then by equalizer
On hinged-support, hinged-support simultaneously produces relative rotation with crossbeam is adjusted around center hinge with vehicle frame main beam, automatic to discharge wheel and rail
Lateral force between road, avoid gnawing rail for a long time.
2nd, installation operation is convenient.Left and right vertical shift chassis and vertical shift vehicle frame are using the form that is flexibly connected, the friction on chassis
Plate is directly contacted with the flanged plate of vehicle frame lower cover, and the connecting cross beam on chassis is fixed with vehicle frame end carriage by latch in addition, whole
Individual chassis and vehicle frame are to transmit driving force by the frictional resistance and bearing pin of contact surface, are easy to tearing open for vertical shift chassis and vertical shift vehicle frame
Dress, labor intensity is low, flexible to operation.
3rd, safety guarantee is good.One end that lower cover coordinates with center hinge in the middle part of vehicle frame end carriage is circular hole, and the other end is
Either side of the small of the back hole, when overhead traveling crane hanging beam travels, circular hole, the design connected mode in either side of the small of the back hole are adapted to certain Bridge Erector horn side sway
Deformation, in addition, either side of the small of the back hole is small relative to connecting cross beam center inside gap, lateral gap is big, can discharge a part due to car
Frame main beam deformation and caused lateral displacement, improve the lateral stressed of hinge and hinged block and vehicle frame main beam junction.
4th, it is simple and compact for structure.Beam-hanging traveling crane shares a set of sprocket wheel chain traction vertical shift system with Bridge Erector horn via,
Make full use of power resource, the design more simple and compact of supporting leg.
Brief description of the drawings
Fig. 1 is beam-hanging traveling crane overall schematic.
Fig. 2 is Fig. 1 left view.
Fig. 3 is the front view of preventing gnawing rail device.
Fig. 4 is Fig. 3 left view.
Fig. 5 be along Fig. 3 A-A to partial sectional view.
Fig. 6 is the partial schematic diagram of vertical shift driving mechanism.
Fig. 7 is Fig. 6 top view.
Fig. 8 is the schematic diagram of oblique pull anchor.
Fig. 9 is Fig. 8 left view.
Reference：
1. vertical shift chassis, 2. vertical shift vehicle frames, 3. preventing gnawing rail devices, 4. cross traveling trolleys, 5. hoist engine assemblies, 6. vertical shifts driving
Mechanism, 7. oblique pull anchors, 8. suspenders, 9. leading block groups, 10. steel wire ropes, 3-1. vehicle frames end carriage, 3-2. vehicle frame main beams,
3-3. hinged-supports, 3-4. friction plates, 3-5. centers hinge, 3-6. connecting cross beams, 3-7. flanges board component, 3-8. rubber blankets, 3-
9. chassis, 3-10. equalizers, 6-1. driving box, 6-2. motor reducers, 6-3. sprocket wheels, 6-4. directive wheels, 6-5. chains are adjusted
Device, 6-6. drive chains, 6-7. guide wheel shafts, 6-8. sprocket shafts, 6-9. horns, 7-1. anchorings telescopic screw rod, 7-2. folding and unfoldings
Supporting leg in device, 7-3. cylinder holders, 7-4. vehicle frames end carriage, 7-5. vehicle frame main beams, 7-6..
Embodiment
Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.
Embodiment：
As shown in Figure 1 to Figure 2, separate unit beam-hanging traveling crane is by two vehicle frame main beams across left and right Bridge Erector horn and left and right
Vehicle frame end carriage forms vertical shift vehicle frame 2.Vertical shift driving mechanism 6 is connected with two end of main beam on vertical shift vehicle frame 2 using flange, vertical shift
The girder top of vehicle frame 2 is provided with rail and provides support for cross traveling trolley 4, and end carriage lower support can be made on vertical shift chassis 1
Longitudinally running, it is vertical with the common offer of the leading block group 9 being located on cross traveling trolley 4 that hoist engine assembly 5 is provided with the outside of end carriage
The motion in direction, oblique pull anchor 7 is located on the outside of rear beam-hanging traveling crane end carriage, with the collective effect bogie of vertical shift driving mechanism 6
Bridge machine horn vertical shift via.
As shown in Figures 3 to 5, the vehicle frame main beam 3-2 lower covers end of preventing gnawing rail device uses spiral shell with flange board component 3-7
Tether and connect, centre is provided with rubber blanket 3-8, can play a part of certain buffering release deformation, flange board component 3-7 lower ends are set
There is stainless steel plate, for preventing resistance increase caused by getting rusty, the polylith friction plate that the stainless steel plate is provided with hinged-support 3-3
3-4 is directly contacted, and oil groove hole is provided with the flanged plate and friction plate 3-4 on hinged-support 3-3, convenient to inject lubricating oil, is reduced
The relative frictional resistance slided of vehicle frame main beam 3-2 and hinged-support 3-3.Fixed and connected by connecting cross beam 3-6 between two hinged-support 3-3
Connect, center hinge 3-5 one end is fixed by axle sleeve and clamp and connecting cross beam 3-6, and the other end extend into side vehicle frame end carriage
In the middle part of 3-1 in the either side of the small of the back hole of trapezoid seat, trapezoid seat and center hinge 3-5 cooperations are circular hole in the middle part of opposite side vehicle frame end carriage 3-1,
When overhead traveling crane hanging beam travels, the design connected mode in one end circular hole one end either side of the small of the back hole is adapted to certain crane's major girder side sway
Deformation, in addition, either side of the small of the back hole is small relative to connecting cross beam 3-6 center insides gap, lateral gap is big, can discharge a part due to
Vehicle frame main beam 3-2 is deformed and caused lateral displacement, is improved center hinge 3-5 and hinged-support 3-3 and is connected with vehicle frame main beam 3-2
Place it is lateral stressed, so as to which that reduces chassis 3-9 wheels and track gnaws trailer rate.
When overhead traveling crane is during traveling, when rail occur gnawing in chassis 3-9 wheel rims and rail contact, track must have
One reaction force acts are on wheel, so as to pass power by chassis 3-9 power transmissions to equalizer 3-10, then by equalizer 3-10
Onto hinged-support 3-3, hinged-support 3-3 simultaneously produces relative rotation with connecting cross beam 3-6 around center hinge 3-5 and vehicle frame main beam 3-2,
Lateral force between automatic release wheel and track, avoids gnawing rail for a long time.Center hinge 3-5 is not only in turning round
The heart, also play connection intermal force.
After said structure, the present embodiment also discloses a kind of realizes that Bridge Erector horn is indulged with the driving force of beam-hanging traveling crane
The method for moving past hole：
A set of sprocket wheel chain traction vertical shift system is shared using beam-hanging traveling crane and Bridge Erector horn via, in horn vertical shift
Kong Shi, rear beam-hanging traveling crane are connected by the oblique pull anchor being located at thereon with middle supporting leg, and middle supporting leg anchors with box beam, to realize
Beam-hanging traveling crane " quiet " and Bridge Erector horn " dynamic ".
As shown in Figures 6 to 9, vertical shift driving mechanism and oblique pull anchor, collective effect is in driving overhead traveling crane lifting vertical shift
Box beam and driving Bridge Erector horn via.
Wherein, vertical shift driving mechanism be arranged symmetrically using double vertical shift variable-frequency motors, sprocket wheel chain drive, the operation of unilateral double track
Vertical shift system design, power is transmitted to sprocket wheel 6-3, sprocket wheel 6-3 and drive chain by motor reducer 6-2 by sprocket shaft 6-8
6-6 engagements are engaged so as to drive driving box 6-1 to walk by directive wheel 6-4 with the drive chain 6-6 being fixed on horn 6-9 again
OK, drive chain 6-6 is fixed on horn 6-9 by adjusting device for chains 6-5, driving box 6-1 again with vehicle frame main beam 7-5
Flange connects, and finally realizes the advance and retrogressing of overhead traveling crane.
Wherein, oblique pull anchor 7 is located on rear overhead traveling crane, and draw off gear 7-2 is mainly by telescopic oil cylinder and connection steel wire
Rope composition, its one end are fixed in vehicle frame main beam 7-5 on coxostermum by cylinder holder 7-3, and the other end is by connecting steel wire
Rope is fixed with anchoring telescopic screw rod 7-1, and anchoring telescopic screw rod 7-1 one end is fixed on vehicle frame end carriage 7-4, when horn 6-9 needs
During vertical shift via, draw off gear 7-2 is put down telescopic screw rod 7-1 is anchored, regulation anchoring telescopic screw rod 7-1 length, allows anchoring
The telescopic screw rod 7-1 other ends link together with middle supporting leg 7-6, and so as to realize horn 6-9 vertical shifts forward, and horn vertical shift is to rear
Reaction force caused by overhead traveling crane backward is to be delivered to by anchoring telescopic screw rod 7-1 on middle supporting leg 7-6.Horn 6-9 vertical shifts are arrived
Behind position, anchoring telescopic screw rod 7-1 and middle supporting leg 7-6 connection is released, grappling telescopic screw rod 7-1 is retracted original by draw off gear 7-2
Beginning position.
By foregoing description, the utility model has the advantage of：
1st, it is adaptive strong.When overhead traveling crane is during traveling, when there is gnawing rail in bogie wheels wheel rim and rail contact, rail
Road must have a reaction force acts on wheel, so as to pass to power by chassis power transmission to equalizer, then by equalizer
On hinged-support, hinged-support simultaneously produces relative rotation with crossbeam is adjusted around center hinge with vehicle frame main beam, automatic to discharge wheel and rail
Lateral force between road, avoid gnawing rail for a long time.
2nd, installation operation is convenient.Left and right vertical shift chassis and vertical shift vehicle frame are using the form that is flexibly connected, the friction on chassis
Plate is directly contacted with the flanged plate of vehicle frame lower cover, and the connecting cross beam on chassis is fixed with vehicle frame end carriage by latch in addition, whole
Individual chassis and vehicle frame are to transmit driving force by the frictional resistance and bearing pin of contact surface, are easy to tearing open for vertical shift chassis and vertical shift vehicle frame
Dress, labor intensity is low, flexible to operation.
3rd, safety guarantee is good.One end that lower cover coordinates with center hinge in the middle part of vehicle frame end carriage is circular hole, and the other end is
Either side of the small of the back hole, when overhead traveling crane hanging beam travels, the design connected mode in one end circular hole one end either side of the small of the back hole is adapted to certain Bridge Erector
Horn side bending deformation, in addition, either side of the small of the back hole is small relative to connecting cross beam center inside gap, lateral gap is big, can discharge one
The caused lateral displacement point due to vehicle frame main beam deformation, improve hinge and hinged block and vehicle frame main beam junction laterally by
Power.
4th, it is simple and compact for structure, it is reliable.Beam-hanging traveling crane shares a set of sprocket wheel chain traction with Bridge Erector horn via
Vertical shift system, make full use of power resource, the design more simple and compact of supporting leg.Vertical shift via uses motor-reductor-chain
The mode of transmission traction travelling wheel is run, and relatively conventional type of drive is not easy to skid, and is operated steadily reliable.
Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement to described specific embodiment or using similar
Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.
Claims (7)
- A kind of 1. preventing gnawing rail device for beam-hanging traveling crane, it is characterised in that including：Connecting cross beam (3-6), the hinged-support (3-3) of its both ends connection chassis (3-9)；Center hinge (3-5), its one end are fixedly connected in the middle part of crossbeam (3-6), and the other end is extend into the middle part of vehicle frame end carriage (3-1) In connecting hole.
- A kind of 2. preventing gnawing rail device for beam-hanging traveling crane according to claim 1, it is characterised in that at least side vehicle frame The connecting hole set in the middle part of end carriage (3-1) is waist round hole.
- A kind of 3. preventing gnawing rail device for beam-hanging traveling crane according to claim 1, it is characterised in that side vehicle frame end carriage The connecting hole set in the middle part of (3-1) is waist round hole, and the connecting hole set in the middle part of opposite side vehicle frame end carriage (3-1) is circular hole.
- A kind of 4. preventing gnawing rail device for beam-hanging traveling crane according to claim 1, it is characterised in that hinged-support (3-3) It is provided with polylith friction plate (3-4)；Flange board component (3-7) lower end of vehicle frame main beam lower cover end be provided with for and it is described The stainless steel plate that friction plate (3-4) directly contacts.
- A kind of 5. preventing gnawing rail device for beam-hanging traveling crane according to claim 1, it is characterised in that vehicle frame main beam lower cover Rubber blanket (3-8) is provided between plate end and the flange board component (3-7) for being arranged at its lower end.
- 6. a kind of preventing gnawing rail beam-hanging traveling crane, it is characterised in that including the preventing gnawing rail device described in any of the above-described claim.
- A kind of 7. preventing gnawing rail beam-hanging traveling crane according to claim 6, it is characterised in that including：Separate unit beam-hanging traveling crane is by two Bar forms vertical shift vehicle frame, vertical shift driving mechanism and vertical shift across the vehicle frame main beam of left and right Bridge Erector horn and the vehicle frame end carriage of left and right Two end of main beam on vehicle frame are connected using flange, and the girder top of vertical shift vehicle frame is provided with rail and provides branch for cross traveling trolley Support, end carriage lower support can be made longitudinally running on vertical shift chassis, and it is traversing with being located to be provided with hoist engine assembly on the outside of end carriage Leading block group on dolly provides the motion of vertical direction jointly, and oblique pull anchor is located on the outside of rear beam-hanging traveling crane end carriage, Bridge Erector horn vertical shift via is driven with vertical shift driving mechanism collective effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720373717.XU CN206735640U (en) | 2017-04-11 | 2017-04-11 | Preventing gnawing rail device and beam-hanging traveling crane for beam-hanging traveling crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720373717.XU CN206735640U (en) | 2017-04-11 | 2017-04-11 | Preventing gnawing rail device and beam-hanging traveling crane for beam-hanging traveling crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206735640U true CN206735640U (en) | 2017-12-12 |
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ID=60560150
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720373717.XU Expired - Fee Related CN206735640U (en) | 2017-04-11 | 2017-04-11 | Preventing gnawing rail device and beam-hanging traveling crane for beam-hanging traveling crane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106915688A (en) * | 2017-04-11 | 2017-07-04 | 中铁工程机械研究设计院有限公司 | Preventing gnawing rail device, beam-hanging traveling crane and its walking method for beam-hanging traveling crane |
-
2017
- 2017-04-11 CN CN201720373717.XU patent/CN206735640U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106915688A (en) * | 2017-04-11 | 2017-07-04 | 中铁工程机械研究设计院有限公司 | Preventing gnawing rail device, beam-hanging traveling crane and its walking method for beam-hanging traveling crane |
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Granted publication date: 20171212 Termination date: 20190411 |