CN202492304U - Hinged point rotating device, installation structure of superlift pulling plate and whole ground crane - Google Patents
Hinged point rotating device, installation structure of superlift pulling plate and whole ground crane Download PDFInfo
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- CN202492304U CN202492304U CN2012201262934U CN201220126293U CN202492304U CN 202492304 U CN202492304 U CN 202492304U CN 2012201262934 U CN2012201262934 U CN 2012201262934U CN 201220126293 U CN201220126293 U CN 201220126293U CN 202492304 U CN202492304 U CN 202492304U
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- ear
- draws
- hinge
- draw
- connecting bushing
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Abstract
The utility model discloses a hinged point rotating device, an installation structure of an superlift pulling plate comprising the hinged point rotating device and a whole ground crane. The hinged point rotating device comprises a connecting shaft sleeve (21), a first pulling lug (22), a second pulling lug (23) and a third pulling lug (24), wherein the first pulling lug (22) is connected with the connecting shaft sleeve (21), the first pulling lug (22) is connected with the second pulling lug (23) by winding a first axis in a pivoting and rotating way, the second pulling lug (23) is connected with the third pulling lug (24) by winding a second axis in the pivoting and rotating way, and optional two parts among the first axis, the second axis and an axis of the connecting shaft sleeve (21) are not paralleled. By using the hinged point rotating device disclosed by the utility model, the superlift pulling plate can pivot and rotate along the three axes which are not mutually paralleled through the hinged point rotating device, thus the angle can be regulated within a 360-degree range, and the position of an superlift mast in various working conditions can be adapted.
Description
Technical field
The utility model relates to and has surpassed arm-tie, particularly, and the mounting structure that has surpassed arm-tie and full ground hoisting crane that relate to a kind of hinge slewing arrangement and comprise this hinge slewing arrangement.
Background technology
Along with hoisting crane develops towards large-tonnage, usually need to be equipped with various auxiliarys (for example tower auxiliary etc.) on the principal arm of hoisting crane and surpassed mast.Particularly; With full ground hoisting crane is example; Full ground hoisting crane comprises principal arm, auxiliary, surpass mast, steel rope and surpassed arm-tie, has surpassed mast and be two also to be installed in respectively on the principal arm, and each has surpassed winch is installed on the mast; One end of steel rope is connected in winch, and the other end is connected in the cephalad arm joint of principal arm.An end that has surpassed arm-tie is connected in and has surpassed mast, and the other end is connected in the root of principal arm, and particularly, the other end that has surpassed arm-tie is connected in the articulated position of principal arm and turntable.
In the prior art, principal arm can be installed to turntable through base 100, and is as shown in Figure 1, can be welded with axle 200 on the base 100, and having surpassed arm-tie can be installed to axle 200 through drawing ear piece 300.Particularly, draw an end of ear piece 300 to have assembly opening 310, surpassed arm-tie to connect, the other end has assembling sleeve 320, to be set in pivotly on the axle 200.Wherein, the axial and axle 200 of assembly opening 310 is axial vertical.Thus; Arm-tie can through draw ear piece 300 around two vertical directions (be assembly opening 310 axially with axle 200 axially) pivot; Thereby, two subtended angles that surpassed between the mast can pivot when changing, to change to variation corresponding to the position that has surpassed mast around above-mentioned both direction.
But, in the existing structure, draw the ear piece 300 can only be moving around two vertical direction pivots, can't corresponding surpass the different angle under whole operating modes of mast, the degree of freedom that causes connecting the arm-tie rotation that has surpassed mast and principal arm is limited.
The utility model content
The purpose of the utility model provides a kind of hinge slewing arrangement, and this hinge slewing arrangement can make the different angle that has surpassed under the corresponding whole operating modes that surpass mast of arm-tie carry out position adjustment.
To achieve these goals; The utility model provides a kind of hinge slewing arrangement; Wherein, Said hinge slewing arrangement comprises that connecting bushing, first draws ear, second to draw ear and the 3rd to draw ear, and said first draws ear to be connected with said connecting bushing, and said first draws ear to draw ear to be connected pivotly around first axle with said second; Said second draws ear and the said the 3rd to draw ear to be connected pivotly around second axis, in the axis of said first axle, said second axis and said connecting bushing any two not parallel.
Preferably, the axis of said first axle, said second axis and said connecting bushing is vertical each other.
Preferably, said first draws ear, second to draw ear and the 3rd to draw two in the ear to laterally arrange, and another is vertical with two that laterally arrange.
Preferably, said first draws ear and said second to draw ear to laterally arrange, and the axially parallel of said connecting bushing draws ear in the said the 3rd.
Preferably; Said first draws ear and said second to draw ear to have installation holes for matching and is connected pivotly through first adapter shaft that passes said mounting hole; Wherein, at least one end of said first adapter shaft is provided with back-up ring, and/or at least one end of said first adapter shaft is provided with lock pin.
Preferably, said first to draw ear be two and laterally arrange, and said second draws ear to should be two and laterally arrange mutually.
Preferably; Said second draws an end of ear to have first flange; The said the 3rd draws the respective ends of ear to have second flange, and said first flange is parallel with said second flange, and said first flange has through hole; Said second flange has tapped bore; Said second draws ear and the said the 3rd to draw ear to be connected through second adapter shaft that passes said through hole and said tapped bore, and an end of said second adapter shaft has stop part, and the part near the other end of said at least second adapter shaft has the outside thread that can engage with the negative thread of said tapped bore.
Preferably, said second to draw ear be two and laterally arrange, and said first flange connects said two second ends of drawing ear.
Preferably; The said the 3rd draws the part of said second flange of being provided with of ear to have the hole of dodging; The other end of said second adapter shaft reaches the said hole of dodging from said second flange; The said other end has groove, and said hinge slewing arrangement comprises and the jam plate of said fillister joint that the part of said jam plate is stretched out from the two ends of said groove.
Preferably, said connecting bushing is provided with the oil passage and the closeouts of the said oil passage of shutoff removably.
The utility model also provides a kind of mounting structure that has surpassed arm-tie; Wherein, The said mounting structure that has surpassed arm-tie comprises the hinge slewing arrangement of the utility model and has surpassed arm-tie; Said connecting bushing is connected in the articulated position of the turntable and the principal arm of hoisting crane pivotly, and the said arm-tie that surpassed is connected in the said the 3rd and draws ear.
The utility model also provides a kind of full ground hoisting crane, and wherein, said full ground hoisting crane comprises the mounting structure that has surpassed arm-tie of the utility model.
Preferably, said turntable and principal arm are hinged through bearing pin, and the outside of said bearing pin is arranged with the bearing pin axle sleeve, and said connecting bushing is set in an end of said bearing pin axle sleeve.
Preferably, said bearing pin axle sleeve has end difference, said connecting bushing the radial dimension of sheathed end less than the size of other parts of said bearing pin axle sleeve, said connecting bushing is through baffle plate and said end difference axial limiting.
Preferably, be provided with spacer between said connecting bushing and the said bearing pin axle sleeve.
Through technique scheme, having surpassed arm-tie can pivot around three mutual uneven axis through said hinge slewing arrangement, thereby in 360 degree scopes, adjusts angle, has surpassed the position of mast under various operating modes to adapt to.
Other feature and advantage of the utility model will partly specify in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is the further understanding that is used to provide the utility model, and constitutes the part of specification sheets, is used to explain the utility model with the following specific embodiment, but does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is the scheme drawing that draws the ear and the annexation of axle in the explanation prior art;
Fig. 2 is a kind of vertical view cutaway drawing of embodiment of the hinge slewing arrangement of explanation the utility model;
Fig. 3 is the front view of hinge slewing arrangement shown in Figure 2;
Fig. 4 is a kind of scheme drawing of the mounting structure that has surpassed arm-tie of embodiment of the full ground hoisting crane of explanation the utility model;
Fig. 5 is that the master of Fig. 4 looks part sectional view.
Description of reference numerals
10: surpassed arm-tie
20: the hinge slewing arrangement
21: connecting bushing 21a: oil passage 21b: closeouts
Draw ear 22a at 22: the first: the first brace panel 22b: second brace panel
Draw ear 23a at 23: the second: the first flange 23b: through hole
Drew ear 24a in 24: the three: the second flange 24b: tapped bore 24c: dodge the hole
24d: the 3rd brace panel
28: the second adapter shaft 28a: groove 29: jam plate
30: bearing pin 40: bearing pin axle sleeve 41: end difference 50: baffle plate
60: spacer
100: base 200: axle
300: draw ear piece 310: assembly opening 320: assembling sleeve
400: turntable
The specific embodiment
Be elaborated below in conjunction with the specific embodiment of accompanying drawing to the utility model.Should be understood that the specific embodiment described herein only is used for explanation and explains the utility model, is not limited to the utility model.
In the utility model, not do under the situation of opposite explanation, the noun of locality of use typically refers to reference to upper and lower, left and right shown in the drawings like " upper and lower, left and right "; " inside and outside " is meant inside and outside with respect to the profile of each parts itself.
An aspect according to the utility model; A kind of hinge slewing arrangement is provided; Wherein, Said hinge slewing arrangement 20 comprises that connecting bushing 21, first draws ear 22, second to draw ear 23 and the 3rd to draw ear 24, and said first draws ear 22 to be connected with said connecting bushing 21, and said first draws ear 22 and said second to draw ear 23 to be connected pivotly around first axle; Said second draws ear 23 and the said the 3rd to draw ear 24 to be connected pivotly around second axis, in the axis of said first axle, said second axis and said connecting bushing 21 any two not parallel.
During use, arm-tie 10 can draw ear 24 to be connected in the hinge slewing arrangement of the utility model through the 3rd, and connecting bushing 21 can be installed on the axle (the for example bearing pin axle sleeve 40 of hereinafter explanation) that is arranged on turntable 400 or the principal arm.Thus; Arm-tie 10 can draw ear 22, second to draw ear 23 and the 3rd to draw ear 24 pivoting to each other to be connected and sheathed connection of connecting bushing 21 and said axle and pivoting around three uneven in twos axis through first, thereby the subtended angle change that can be suitable for surpass mast is adjusted arbitrarily in 360 degree scopes adaptively.
In the preferred implementation of the utility model, the axis of said first axle, said second axis and said connecting bushing 21 is vertical each other, so that processing and manufacturing.More preferably, said first draws ear 22, second to draw ear 23 and the 3rd to draw two in the ear 24 can laterally arrange, and another is vertical with two that laterally arrange, so that arrange.For example, to embodiment shown in Figure 5, said first draws ear 22 to draw ear 23 to laterally arrange with said second at Fig. 2, and the axially parallel of said connecting bushing 21 draws ear 24 in the said the 3rd.Certainly, also can make first to draw ear 22 and the 3rd to draw ear 24 to laterally arrange, perhaps make second to draw ear 23 and the 3rd to draw ear 24 to laterally arrange.
In addition, in the utility model, can adopt various suitable modes and structure, so that first draws ear 22 and second to draw ear 23 to be connected pivotly around first axle.
Particularly; For example; In embodiment shown in Figure 2, said first draws ear 22 and said second to draw ear 23 can have installation holes for matching and is connected pivotly through first adapter shaft 25 that passes said mounting hole, wherein; At least one end of said first adapter shaft 25 is provided with back-up ring 26, and/or at least one end of said first adapter shaft 25 is provided with lock pin 27.Thus, first axle is the axis of first adapter shaft 25, and first draws ear 22 and second to draw ear 23 to be pivoted relative to each other around first adapter shaft 25, and back-up ring 26 can prevent that with lock pin 27 first draws ear 22 and second to draw axially relatively moving of ear 23.
In addition, as shown in Figure 2, said first draws ear 22 and to laterally arrange for two, and said second draws ear 23 can should be two and laterally arrange mutually, thereby guarantees that first draws ear 22 and second to draw the pivoted connection structure of ear 23 stable.
Same, can adopt various suitable modes and structure, so that second draws ear 23 and the 3rd to draw ear 24 to be connected pivotly around second axis.
Particularly; For example; In Fig. 2 and embodiment shown in Figure 3, said second draws an end of ear 23 can have the first flange 23a, and the said the 3rd draws the respective ends of ear 24 to have the second flange 24a; The said first flange 23a is parallel with the said second flange 24a; The said first flange 23a has through hole 23b, and the said second flange 24a has tapped bore 24b, and said second draws ear 23 and the said the 3rd to draw ear 24 to be connected through second adapter shaft 28 that passes said through hole 23b and said tapped bore 24b; One end of said second adapter shaft 28 has stop part, and the part near the other end of said at least second adapter shaft 28 has the outside thread that can engage with the negative thread of said tapped bore 24b.Thus, second axis is the axis of second adapter shaft 28, and second draws ear 23 and the 3rd to draw ear 24 to be pivoted relative to each other around second adapter shaft 28.
Wherein, understandable, the size of stop part of an end that is positioned at second adapter shaft 28 is greater than the size of through hole, thereby is used for backstop in through hole.Thus, second adapter shaft 28 can be threadably engaged on the one hand, can prevent moving axially of second adapter shaft 28 through stop part on the other hand, guarantees that second draws ear 23 and the 3rd to draw the relative position of ear 24 to fix.
Preferably, as shown in Figure 2, said second draws ear 23 and to laterally arrange for two, and the said first flange 23a connects said two second ends of drawing ear 23, so that second draws ear 23 and the 3rd to draw ear 24 to obtain stable connection structure.
In addition; For further preventing moving axially of second adapter shaft 28, as shown in Figure 2, the said the 3rd draws the part of the said second flange 24b of being provided with of ear 24 can have the hole of dodging 24c; The other end of said second adapter shaft 28 reaches the said hole 24c that dodges from the said second flange 24b; The said other end has groove 28a, and said hinge slewing arrangement 20 comprises the jam plate 29 that engages with said groove 28a, and the part of said jam plate 29 is stretched out from the two ends of said groove 28a.Thus, at the end with screw thread of second adapter shaft 28, can limit the axial location of second adapter shaft 28 with jam plate 29 through being threaded.In other words, the two ends of second adapter shaft 28 are spacing through stop part and jam plate 29 respectively, can guarantee reliably that second draws ear 23 and the 3rd to draw the relative position of ear 24 to fix.
Wherein, preferably,, can make second adapter shaft 28 and the second flange 24b through long as far as possible threads engage for further guaranteeing the stationkeeping of second adapter shaft 28.Therefore, can make the outside thread of second adapter shaft 28 begin from its end to extend, and make length roughly reach length half the of second adapter shaft 28 with male thread portion.
In addition, as shown in Figure 2, said connecting bushing 21 can be provided with oil passage 21a and the closeouts 21b of the said oil passage 21a of shutoff removably.Thus, can also in connecting bushing 21, add or make-up oil by regular dismounting closeouts 21b, with the inboard contact surface of lubricated connecting bushing 21 through oil passage 21a.Wherein, oil passage 21a can be tapped bore, and closeouts 21b can be a screw.
Be to keep Stability Analysis of Structures, as shown in Figures 2 and 3, can be provided with from connecting bushing 21 extend to first draw ear 22 the first brace panel 22a.In addition, also can first draw ear 22 the arranged outside second brace panel 22b.Likewise, can also draw the both sides of ear 24 that the 3rd brace panel 24d is set the 3rd.
According to the utility model on the other hand; A kind of mounting structure that has surpassed arm-tie is provided; Wherein, The hinge slewing arrangement 20 that the said mounting structure that has surpassed arm-tie comprises the utility model with surpass arm-tie 10, said connecting bushing 21 is connected in the turntable 400 of hoisting crane and the articulated position of principal arm pivotly, the said arm-tie 10 that surpassed is connected in the said the 3rd and draws ear 24.
During use; Arm-tie 10 can draw ear 22, second to draw ear 23 and the 3rd to draw ear 24 pivoting to each other to be connected and connecting bushing 21 and pivoting around three uneven in twos axis through first, thereby the subtended angle change that can be suitable for surpass mast is adjusted arbitrarily in 360 degree scopes adaptively.
According to the utility model on the other hand, a kind of full ground hoisting crane is provided, wherein, said full ground hoisting crane comprises the mounting structure that has surpassed arm-tie of the utility model.
Wherein, It is hinged that said turntable 400 and said principal arm can pass through bearing pin 30 (in Fig. 4 and embodiment shown in Figure 5, for ease of explaining, only having shown turntable 400); The outside of said bearing pin 30 is arranged with bearing pin axle sleeve 40, and said connecting bushing 21 is set in an end of said bearing pin axle sleeve 40.Wherein, bearing pin axle sleeve 40 can be arranged on turntable 400 or the principal arm, and in Fig. 4 and embodiment shown in Figure 5, bearing pin axle sleeve 40 is arranged on the turntable 400.Thus; Arm-tie 10 can draw ear 22, second to draw ear 23 and the 3rd to draw ear 24 pivoting to each other to be connected and sheathed connection of connecting bushing 21 and bearing pin axle sleeve 40 and pivoting around three uneven in twos axis through first, thereby the subtended angle change that can be suitable for surpass mast is adjusted arbitrarily in 360 degree scopes adaptively.
In addition, said bearing pin axle sleeve 40 can have end difference 41, said connecting bushing 21 the radial dimension of sheathed end less than the size of other parts of said bearing pin axle sleeve 41, said connecting bushing 21 is through baffle plate 50 and said end difference 41 axial limitings.As shown in Figure 5, the two ends of baffle plate 50 and end difference 41 difference backstop connecting bushings 21 are to limit the axial location of connecting bushing 21.
Preferably, can be provided with spacer 60 between said connecting bushing 21 and the said bearing pin axle sleeve 40, to slow down wearing and tearing, like Fig. 3 and shown in Figure 5.Wherein, spacer 60 can be that metal is processed, and is for example processed by copper or copper alloy.
More than combine accompanying drawing to describe the preferred implementation of the utility model in detail; But; The utility model is not limited to the detail in the above-mentioned embodiment; In the technical conceive scope of the utility model, can carry out multiple simple variant to the technical scheme of the utility model, these simple variant all belong to the protection domain of the utility model.
Need to prove that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment under reconcilable situation, can make up through any suitable manner.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible array modes.
In addition, also can carry out combination in any between the various embodiment of the utility model, as long as its thought without prejudice to the utility model, it should be regarded as content disclosed in the utility model equally.
Claims (15)
1. hinge slewing arrangement; It is characterized in that; Said hinge slewing arrangement (20) comprises that connecting bushing (21), first draws ear (22), second to draw ear (23) and the 3rd to draw ear (24); Said first draws ear (22) to be connected with said connecting bushing (21); Said first draws ear (22) and said second to draw ear (23) to be connected pivotly around first axle, and said second draws ear (23) and the said the 3rd to draw ear (24) to be connected pivotly around second axis, in the axis of said first axle, said second axis and said connecting bushing (21) any two not parallel.
2. hinge slewing arrangement according to claim 1 is characterized in that, said first axle, said second axis are vertical each other with the axis of said connecting bushing (21).
3. hinge slewing arrangement according to claim 2 is characterized in that, said first draws ear (22), second to draw ear (23) and the 3rd to draw two in the ear (24) to laterally arrange, and another is vertical with two that laterally arrange.
4. hinge slewing arrangement according to claim 3 is characterized in that, said first draws ear (22) and said second to draw ear (23) to laterally arrange, and the axially parallel of said connecting bushing (21) draws ear (24) in the said the 3rd.
5. hinge slewing arrangement according to claim 4; It is characterized in that; Said first draws ear (22) and said second to draw ear (23) to have installation holes for matching and is connected pivotly through first adapter shaft (25) that passes said mounting hole; Wherein, at least one end of said first adapter shaft (25) is provided with back-up ring (26), and/or at least one end of said first adapter shaft (25) is provided with lock pin (27).
6. hinge slewing arrangement according to claim 5 is characterized in that, said first to draw ear (22) be two and laterally arrange, and said second draws ear (23) to should be two and laterally arrange mutually.
7. hinge slewing arrangement according to claim 4; It is characterized in that; Said second draws an end of ear (23) to have first flange (23a); The said the 3rd draws the respective ends of ear (24) to have second flange (24a), and said first flange (23a) is parallel with said second flange (24a), and said first flange (23a) has through hole (23b); Said second flange (24a) has tapped bore (24b); Said second draws ear (23) and the said the 3rd to draw ear (24) to be connected through second adapter shaft (28) that passes said through hole (23b) and said tapped bore (24b), and an end of said second adapter shaft (28) has stop part, and the part near the other end of said at least second adapter shaft (28) has the outside thread that can engage with the negative thread of said tapped bore (24b).
8. hinge slewing arrangement according to claim 7 is characterized in that, said second to draw ear (23) be two and laterally arrange, and said first flange (23a) connects said two second ends of drawing ear (23).
9. hinge slewing arrangement according to claim 7; It is characterized in that; The said the 3rd draws the part of said second flange of being provided with of ear (24) (24b) to have the hole of dodging (24c), and the other end of said second adapter shaft (28) reaches the said hole (24c) of dodging from said second flange (24b), and the said other end has groove (28a); Said hinge slewing arrangement (20) comprises the jam plate (29) that engages with said groove (28a), and the part of said jam plate (29) is stretched out from the two ends of said groove (28a).
10. hinge slewing arrangement according to claim 1 is characterized in that, said connecting bushing (21) is provided with the oil passage (21a) and the closeouts (21b) of the said oil passage of shutoff (21a) removably.
11. mounting structure that has surpassed arm-tie; It is characterized in that; The said mounting structure that has surpassed arm-tie comprises according to any described hinge slewing arrangement (20) among the claim 1-10 and has surpassed arm-tie (10); Said connecting bushing (21) is connected in the articulated position of the turntable and the principal arm of hoisting crane pivotly, and the said arm-tie (10) that surpassed is connected in the said the 3rd and draws ear (24).
12. a full ground hoisting crane is characterized in that, said full ground hoisting crane comprises the mounting structure that has surpassed arm-tie according to claim 11.
13. full ground according to claim 12 hoisting crane; It is characterized in that; Said turntable and principal arm are hinged through bearing pin (30), and the outside of said bearing pin (30) is arranged with bearing pin axle sleeve (40), and said connecting bushing (21) is set in an end of said bearing pin axle sleeve (40).
14. full ground according to claim 13 hoisting crane; It is characterized in that; Said bearing pin axle sleeve (40) has end difference (41); Said connecting bushing (21) the radial dimension of sheathed end less than the size of other parts of said bearing pin axle sleeve (41), said connecting bushing (21) is through baffle plate (50) and said end difference (41) axial limiting.
15. according to claim 13 or 14 described full ground hoisting cranes, it is characterized in that, be provided with spacer (60) between said connecting bushing (21) and the said bearing pin axle sleeve (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201262934U CN202492304U (en) | 2012-03-29 | 2012-03-29 | Hinged point rotating device, installation structure of superlift pulling plate and whole ground crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201262934U CN202492304U (en) | 2012-03-29 | 2012-03-29 | Hinged point rotating device, installation structure of superlift pulling plate and whole ground crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202492304U true CN202492304U (en) | 2012-10-17 |
Family
ID=46998540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201262934U Expired - Lifetime CN202492304U (en) | 2012-03-29 | 2012-03-29 | Hinged point rotating device, installation structure of superlift pulling plate and whole ground crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202492304U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103395704A (en) * | 2013-08-12 | 2013-11-20 | 中联重科股份有限公司 | Pull rod mounting device and tower crane with same |
| CN104176654A (en) * | 2014-08-29 | 2014-12-03 | 中联重科股份有限公司 | Pivotal structure and crane derrick component with same |
-
2012
- 2012-03-29 CN CN2012201262934U patent/CN202492304U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103395704A (en) * | 2013-08-12 | 2013-11-20 | 中联重科股份有限公司 | Pull rod mounting device and tower crane with same |
| CN103395704B (en) * | 2013-08-12 | 2015-04-08 | 中联重科股份有限公司 | Pull rod mounting device and tower crane with same |
| CN104176654A (en) * | 2014-08-29 | 2014-12-03 | 中联重科股份有限公司 | Pivotal structure and crane derrick component with same |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121017 |
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| CX01 | Expiry of patent term |