CN202379600U - X type support leg of crane and crane provided with support leg - Google Patents
X type support leg of crane and crane provided with support leg Download PDFInfo
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- CN202379600U CN202379600U CN2011205147733U CN201120514773U CN202379600U CN 202379600 U CN202379600 U CN 202379600U CN 2011205147733 U CN2011205147733 U CN 2011205147733U CN 201120514773 U CN201120514773 U CN 201120514773U CN 202379600 U CN202379600 U CN 202379600U
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- leg
- support leg
- hoisting crane
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- 210000001364 Upper Extremity Anatomy 0.000 claims description 40
- 238000003466 welding Methods 0.000 abstract description 15
- 230000003014 reinforcing Effects 0.000 abstract description 7
- 210000001503 Joints Anatomy 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 230000037250 Clearance Effects 0.000 description 4
- 239000011324 bead Substances 0.000 description 4
- 230000035512 clearance Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Abstract
The utility model discloses an X type support leg of a crane. The X type support leg comprises a front support leg and a rear support leg, wherein an upper reinforcing block and a lower reinforcing block are respectively arranged on the two sides of the circular arc transition part of the front support leg and the rear support leg, the upper reinforcing block is embedded into a web plate and an upper cover plate and further welded and connected with the web plate and the upper cover plate, the lower reinforcing block is embedded into the web plate and a lower bottom plate and further welded and connected with the web plate and the lower bottom plate. Both the number of weld joints and the welding quantity at the large circular arc transition part of the support leg are small, so that the X type support leg is easy to weld and can also significantly improve structural strength. In addition, the front support leg has higher structural strength, and the rear support leg can not interfere with a platform plate. The utility model further discloses the crane provided with the X type support leg of the crane.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly the X type supporting leg of wheel crane.The utility model also relates to the hoisting crane that is provided with said supporting leg.
Background technology
The characteristics of wheel crane are to utilize tire device, move along the trackless road surface, and vehicle frame is its walking matrix, and supporting connects each parts of hoisting crane, and bears from the inside and outside various load of car.
Load-carrying ability and working stability when increasing Wheel Crane's Weight Lifting Operation; A leg mechanism must be set; Leg mechanism requires firm reliable, flexible convenient, regains during driving, overhanging support during work, can whole hoisting crane be erected; When the operation of wheel crane lift heavy, the various load that vehicle frame will bear pass to fixed supporting leg through the vehicle frame back segment and arrive ground at last.
According to the difference of leg structure, the supporting leg of wheel crane can be divided into H type supporting leg and X type supporting leg two big classes substantially.
Please refer to Fig. 1, Fig. 1 is the H type supporting leg scheme drawing of a kind of representative type wheel crane in the prior art.
As shown in the figure, the H formula vehicle frame of wheel crane mainly is made up of vehicle frame leading portion 1, preceding fixed supporting leg 2, vehicle frame back segment 3, pivoting support 4, back fixed supporting leg 5 and four telescopic outriggers 6, is H shape after telescopic outrigger 6 is overhanging.When the hoisting crane hoisting operation, derricking gear is delivered to power on the vehicle frame back segment 3 through pivoting support 4, and whole vehicle frame back segment 3 is bearing load all, reaches telescopic outrigger 6 through preceding fixed supporting leg 2, back fixed supporting leg 5 again, arrives ground at last.
Please refer to Fig. 2, Fig. 2 is the X type supporting leg scheme drawing of a kind of representative type wheel crane in the prior art.
As shown in the figure; X type supporting leg mainly is made up of articulated frame 7, movable supporting legs 8, oscillating support leg 9, oscillating oil cylinder 10 etc.; Four oscillating support legs 9 are hinged through four hinges and vehicle frame 7, under the assisting of oscillating oil cylinder 10, can freely swing, and are X-shaped after oscillating support leg 9 is arranged.
For front and back span and the left and right sides span that increases supporting leg, each movable supporting legs 8 forms the binodal telescopic leg can in oscillating support leg 9, level stretching under the cross cylinder effect.During hoisting operation, articulated frame 7 passes to four oscillating support legs 9 and movable supporting legs 8 with the load of being born through four hinges through pivoting support, arrives ground at last.
At present, X type supporting leg mostly adopt movable supporting legs 8 can be in oscillating support leg 9 the flexible binodal telescopic structure of level, can increase the supporting leg span, crane stability is promoted greatly.
Please refer to Fig. 3, Fig. 3 is the partial schematic diagram of oscillating support leg shown in Fig. 2.
As shown in the figure; X type supporting leg is because great circle arc transition position stress is bigger; Therefore its web 11 needs to adopt outer brace panel 12 and interior brace panel (because hiding relation is not shown) to strengthen, and lower shoe 13 needs to adopt upward to be strengthened bent plate 14 and strengthen bent plate 15 reinforcements down; Thereby constitute the sectional construction of lower reinforcing plate on web left and right sides brace panel and the base plate, to bear the stress of great circle arc transition position.This sectional construction that is made up of four kinds of brace panels promotes this place's bending resistance moment of inertia greatly, and promptly load-carrying capacity promotes greatly.
Then, the above-mentioned inside and outside lower reinforcing plate of going up also causes X type supporting leg great circle arc transition position complex structure, pieces together that the some difficulty is big, the weld seam stack is staggered, welding capacity is big when playing booster action.For example, the thickness of web 11 inside and outside brace panels is generally bigger, the welding bead broad of formation, and particularly upper reinforcing plate 14, and it is very near with the twice spreading bead that lower shoe 13 forms with outer brace panel 12, easily the postwelding cracking.
Secondly, the front leg strut of existing X type supporting leg is the binodal telescopic leg, owing to consider based on the car load center of gravity; Preceding movable supporting legs only part is flexible in oscillating support leg; Be movable supporting legs can be in oscillating support leg the flexible cross cylinder stroke ratio of level less, the effect of front leg strut binodal telescopic leg stroke adjustment is not obvious, can increase movable supporting legs and oscillating support leg on the contrary and overlap weight; Make overlap stressed more abominable, reduced the reliability of supporting leg.
In addition, because X type supporting leg design space is limited, X type supporting leg top is a derricking gear, and the supporting leg below is to walk platen to supply person walks, and for satisfying the requirement of supporting leg maximum load capacity, the supporting leg cross section must be enough big.Certainly will cause supporting leg like this and to walk on the platen plane clearance very little,, be easy to and walk the platen interference because assembly clearance and supporting leg self gravitation and vertical oil cylinder weight cause supporting leg downward-sloping more far more apart from hinge.
Therefore; How further to reduce the weld seam quantity and the welding capacity of X type supporting leg great circle arc transition position, thereby improve its structural reliability, and improve the structural strength of its front leg strut; Avoiding the front and back supporting leg and walk the platen interference, is the present technical issues that need to address of those skilled in the art.
The utility model content
First purpose of the utility model provides a kind of hoisting crane X type supporting leg.The weld seam quantity and the welding capacity of this supporting leg great circle arc transition position are less, not only are easy to welding, and can significantly improve structural strength.In addition, its front leg strut has higher structural strength, and the front and back supporting leg not can with walk platen and interfere.
Second purpose of the utility model provides a kind of hoisting crane that is provided with said X type supporting leg.
In order to realize above-mentioned first purpose; The utility model provides a kind of hoisting crane X type supporting leg; Comprise front leg strut and rear support leg; The both sides at the arc transition place of said front leg strut and rear support leg are respectively equipped with boss and following boss, and said upward boss embeds web and upper cover plate and is welded to connect with it, and said boss down embeds web and lower shoe also is welded to connect with it.
Preferably, said front leg strut is a single-unit integral type supporting leg, and said rear support leg is the binodal telescopic leg.
Preferably, said front leg strut and rear support leg are the variable section supporting leg, and its depth of section reduces to the other end from pin jointed end gradually.
Preferably, the upper cover plate of said front leg strut and rear support leg is the level of state, and lower shoe is inclined relative to horizontal certain angle.
Preferably, the angular range that is inclined relative to horizontal of said lower shoe is between 1 °-5 °.
Preferably, the said boss of going up embeds the upper embedded groove of offering on web and the upper cover plate, and said boss down embeds the following caulking groove of offering on web and the lower shoe.
Preferably, said upper embedded groove all takes the form of inclined plane with the sidewall that last boss and following boss weld mutually with following caulking groove.
Preferably, said upward boss is all crooked curved with following boss, and its crooked radian is consistent with the radian at the arc transition place of said front leg strut and rear support leg.
In order to realize above-mentioned second purpose, the utility model also provides a kind of hoisting crane, comprises vehicle frame and is located at the supporting leg on the said vehicle frame, and said supporting leg is above-mentioned each described hoisting crane X type supporting leg.
Preferably, be specially wheel crane.
The hoisting crane X type supporting leg that the utility model provided is strengthened supporting leg through the mode that the both sides of (stress maximum place) at the arc transition place are provided with boss and following boss respectively; The stress of upper and lower, supporting leg arc transition zone is born by last boss and following boss respectively; Because the thickness of last boss and following boss is bigger; Load-carrying capacity own is strong, good reliability, therefore can significantly improve the structural strength of supporting leg.
This damascene structures can effectively solve the problem that the local high-stress area of supporting leg territory exists; Not only can the implementation structure lightweight; And the welding bead that embedded junction is configured to is less, has reduced the weld seam quantity and the welding capacity at this place greatly, because weld seam is the weakest place of leg structure; Therefore, the minimizing of weld seam can further improve the reliability of supporting leg.In addition, the mode that embeds welding is simple more on the whole clean and tidy, and it is convenient to piece together point location, and easy operating can effectively reduce labour intensity.
In a kind of specific embodiment, said front leg strut is a single-unit integral type supporting leg, and said rear support leg is the binodal telescopic leg, and both constitute combined X type supporting leg.Front leg strut is designed to single-unit integral type supporting leg, can saves the horizontal telescopic oil cylinder of front leg strut, supporting leg and the oscillating support leg overlap joint weight that takes in sail, thus avoid lap-joint abominable force-bearing situation to occur, make front leg strut have higher structural strength.
In the another kind of specific embodiment, said front leg strut and rear support leg are the variable section supporting leg, and its depth of section reduces to the other end from pin jointed end gradually.This anti-obliquity formula leg structure form change to realize variable section through depth of section, can either realize the integral structure lightweight, can avoid again because assembly clearance and supporting leg deadweight and vertical oil cylinder weight cause the supporting leg sinking and walks the platen interference.
The hoisting crane that the utility model provided is provided with above-mentioned hoisting crane X type supporting leg, because above-mentioned hoisting crane X type supporting leg has above-mentioned technique effect, the hoisting crane with this hoisting crane X type supporting leg also should possess the corresponding techniques effect.
Description of drawings
Fig. 1 is the H type supporting leg scheme drawing of a kind of representative type wheel crane in the prior art;
Fig. 2 is the X type supporting leg scheme drawing of a kind of representative type wheel crane in the prior art;
Fig. 3 is the partial schematic diagram of oscillating support leg shown in Fig. 2;
Fig. 4 provides the structural representation of hoisting crane X type supporting leg for the utility model;
Fig. 5 is the structural representation at hoisting crane X type supporting leg arc transition shown in Figure 4 place;
Fig. 6 is the local enlarged diagram of Fig. 5;
Fig. 7 is front leg strut shown in Fig. 4 and the relative position relation scheme drawing of walking platen.
Among Fig. 1 to Fig. 3:
1. strengthen bent plate on fixed supporting leg 3. vehicle frame back segments 4. pivoting supports 5. back fixed supporting leg 6. telescopic outriggers 7. articulated framees 8. movable supporting legs 9. oscillating support legs 10. oscillating oil cylinders 11. webs 12. outer brace panel 13. lower shoes 14. before the vehicle frame leading portion 2. and strengthen bent plate 15. times
Among Fig. 4 to Fig. 7:
21. 32. times bosses of boss, 41. webs, 42. upper cover plates, 43. lower shoes 50. are walked platen on front leg strut 22. rear support leg 22-1. oscillating support leg 22-2. movable supporting legs 23. vehicle frames 24. oscillating oil cylinders 31.
The specific embodiment
The core of the utility model provides a kind of hoisting crane X type supporting leg.The weld seam quantity and the welding capacity of this supporting leg great circle arc transition position are less, not only are easy to welding, and can significantly improve structural strength.In addition, its front leg strut has higher structural strength, and the front and back supporting leg not can with walk platen and interfere.
Another core of the utility model provides a kind of hoisting crane that is provided with said X type supporting leg.
In order to make those skilled in the art person understand the utility model scheme better, the utility model is done further to specify below in conjunction with the accompanying drawing and the specific embodiment.
The term in expression orientation such as " upper and lower, left and right " among this paper is based on the position relation of accompanying drawing, should it be interpreted as the absolute qualification to protection domain.
Please refer to Fig. 4, Fig. 4 provides the structural representation of hoisting crane X type supporting leg for the utility model.
In a kind of specific embodiment, the hoisting crane X type supporting leg that the utility model provides comprises that two front leg struts 21 and 22, four supporting legs of two rear support legs are hinged through four hinges and vehicle frame 23, under the assisting of oscillating oil cylinder 24, can freely swing, and is X-shaped after arranging.
Rear support leg 22 is the binodal telescopic leg, mainly is made up of oscillating support leg 22-1 and movable supporting legs 22-2 two parts, and wherein oscillating support leg 22-1 is welded into box-structure by sheet material, is used to connect movable supporting legs 22-2 and vehicle frame 23, can freely swings around hinge; Movable supporting legs 22-2 also is welded into box-structure by sheet material, can in oscillating support leg 22-1, level stretch, and is used to support heavy-duty machine.
Consideration based on the car load center of gravity; The movable supporting legs of existing front leg strut only part is flexible in oscillating support leg; Be that the flexible cross cylinder stroke ratio of movable supporting legs level in oscillating support leg is less, the stroke adjustment effect is not obvious, and movable supporting legs and oscillating support leg lap-joint are stressed more abominable.
To this; The utility model is designed to single-unit integral type supporting leg with front leg strut 21, constitutes combined X type supporting leg with the telescopic rear support leg 22 of binodal, and it is simple and practical; Can save the front leg strut cross cylinder; Reduce front leg strut overlap joint weight, make front leg strut avoid occurring the stressed abominable problem of lap-joint, thereby significantly improve reliability.
Please refer to Fig. 5, Fig. 6, Fig. 5 is the structural representation at hoisting crane X type supporting leg arc transition shown in Figure 4 place; Fig. 6 is the local enlarged diagram of Fig. 5.
As shown in the figure, because the stress of front leg strut 21 and rear support leg 22 great circle arc transition positions is bigger, therefore need strengthen leg structure at this place.
Concrete mode is in the both sides at the arc transition place of front leg strut 21 and rear support leg 22 boss 31 and following boss 32 to be set respectively; Wherein go up boss 31 embedding webs 41 and also be welded to connect with it with upper cover plate 42,32 of following reinforcements embed web 41 and also are welded to connect with it with lower shoe 43.
Last boss 31 is all crooked curved with following boss 32; Its crooked radian is consistent with the radian at the arc transition place of front leg strut 21 and rear support leg 22; Last boss 31 embeds the upper embedded groove of offering on web 41 and the upper cover plate 42, and following boss 32 embeds the following caulking groove of offering on webs 41 and the lower shoe 43.
The sidewall of upper embedded groove and following caulking groove all takes the form of inclined plane, and like this, can form " V " shape weld groove with last boss 31 and following boss 32, is convenient to welding and forms the high strength weld seam.
Please refer to Fig. 7, Fig. 7 is front leg strut shown in Fig. 4 and the relative position relation scheme drawing of walking platen.
As shown in the figure, the upper cover plate 42 of front leg strut 21 is the level of state, lower shoe 43 inclination certain angles; Form angle with horizontal surface, promptly front leg strut 21 is the variable section supporting leg, and its depth of section gradually changes to the other end from pin jointed end; Big more apart from the nearlyer depth of section value of hinge, more little apart from hinge depth of section value far away, whole depth of section variation tendency is consistent with the stressed size variation trend of supporting leg; The stressed height of small bore more is more little, has realized the structure lightweight.
Above-mentioned anti-obliquity formula leg structure can make the lower shoe 43 of front leg strut 21 and the distance walked between the platen 50 increases to the other end from pin jointed end gradually, thereby for front leg strut 21 is downward-sloping enough surpluses is provided.Like this because assembly clearance and supporting leg self gravitation and vertical oil cylinder weight is when causing supporting leg downward-sloping more far more apart from hinge, also not can with walk platen 50 interference.
Above-mentioned rear support leg 22 also adopts anti-obliquity formula structure, and its characteristics are identical with front leg strut 21, just no longer repeats.
Here, the thickness of last boss 31 and following boss 32 is not done concrete qualification, its thickness is big more; Structural strength is high more; Theoretically, because quantity reduces, its thickness should be greater than the thickness of brace panel in the prior art; Those skilled in the art can calculate and test the requirement of supporting leg intensity according to the hoisting crane tonnage, and confirm optimum one-tenth-value thickness 1/10.
In like manner, the angle [alpha] that is inclined relative to horizontal of the lower shoe of front leg strut 21 and rear support leg 22 also can be confirmed according to actual needs.Specifically can be controlled between 1 °-5 °.
The both sides of (stress maximum place) are provided with boss 31 and following boss 32 respectively to above-mentioned hoisting crane X type supporting leg at the arc transition place; When carrying out hoisting operation; The stress of upper and lower, supporting leg arc transition zone is born with following boss 32 by last boss 31 respectively; Because the thickness of last boss 31 and following boss 32 is bigger, load-carrying capacity own is strong, good reliability, therefore can significantly improve the structural strength of supporting leg.
In addition; Damascene structures can effectively solve the problem that the local high-stress area of supporting leg territory exists, not only can the implementation structure lightweight, and also the welding bead that forms is less; The weld seam quantity and the welding capacity at this place have been reduced greatly; Because weld seam is the weakest place of leg structure, therefore, the minimizing of weld seam can further improve the reliability of supporting leg.
In addition, the mode that embeds welding is simple more on the whole clean and tidy, and it is convenient to piece together point location, and easy operating can effectively reduce labour intensity.
Certainly, above-mentioned hoisting crane X type supporting leg only is a kind of preferred version, specifically is not limited thereto, and can make pointed adjustment according to actual needs on this basis, thereby obtain different embodiment.Because mode in the cards is more, casehistory no longer one by one just here.
Except above-mentioned hoisting crane X type supporting leg, the utility model also provides a kind of hoisting crane, comprises vehicle frame and is located at the supporting leg on the said vehicle frame, and said supporting leg is above-described hoisting crane X type supporting leg, and all the other structures please refer to prior art, just repeat no more.
Particularly, said hoisting crane is a wheel crane.This hoisting crane utilizes tire device to carry or the motion of trackless road surface, no-load condition lower edge at band, and relies on deadweight to keep stable.
More than hoisting crane X type supporting leg and hoisting crane that the utility model provided have been carried out detailed introduction.Used concrete example among this paper the principle and the embodiment of the utility model are set forth, the explanation of above embodiment just is used to help to understand the core concept of the utility model.Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (10)
1. hoisting crane X type supporting leg; Comprise front leg strut and rear support leg; It is characterized in that; The both sides at the arc transition place of said front leg strut and rear support leg are respectively equipped with boss and following boss, and said upward boss embeds web and upper cover plate and is welded to connect with it, and said boss down embeds web and lower shoe also is welded to connect with it.
2. hoisting crane X type supporting leg according to claim 1 is characterized in that said front leg strut is a single-unit integral type supporting leg, and said rear support leg is the binodal telescopic leg.
3. hoisting crane X type supporting leg according to claim 2 is characterized in that said front leg strut and rear support leg are the variable section supporting leg, and its depth of section reduces to the other end from pin jointed end gradually.
4. hoisting crane X type supporting leg according to claim 3 is characterized in that the upper cover plate of said front leg strut and rear support leg is the level of state, and lower shoe is inclined relative to horizontal certain angle.
5. hoisting crane X type supporting leg according to claim 4 is characterized in that the angular range that said lower shoe is inclined relative to horizontal is between 1 °-5 °.
6. according to each described hoisting crane X type supporting leg of claim 1 to 5, it is characterized in that the said boss of going up embeds the upper embedded groove of offering on web and the upper cover plate, said boss down embeds the following caulking groove of offering on web and the lower shoe.
7. according to each described hoisting crane X type supporting leg of claim 1 to 5, it is characterized in that said upper embedded groove all takes the form of inclined plane with the sidewall that last boss and following boss weld mutually with following caulking groove.
8. according to each described hoisting crane X type supporting leg of claim 1 to 5, it is characterized in that said upward boss is all crooked curved with following boss, its crooked radian is consistent with the radian at the arc transition place of said front leg strut and rear support leg.
9. a hoisting crane comprises vehicle frame and is located at the supporting leg on the said vehicle frame, it is characterized in that, said supporting leg is aforesaid right requirement 1 to 8 each described hoisting crane X type supporting leg.
10. hoisting crane according to claim 9 is characterized in that, is specially wheel crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205147733U CN202379600U (en) | 2011-12-09 | 2011-12-09 | X type support leg of crane and crane provided with support leg |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205147733U CN202379600U (en) | 2011-12-09 | 2011-12-09 | X type support leg of crane and crane provided with support leg |
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| Publication Number | Publication Date |
|---|---|
| CN202379600U true CN202379600U (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011205147733U Expired - Lifetime CN202379600U (en) | 2011-12-09 | 2011-12-09 | X type support leg of crane and crane provided with support leg |
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| CN (1) | CN202379600U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431915A (en) * | 2011-12-09 | 2012-05-02 | 徐州重型机械有限公司 | X-shaped outrigger for crane and crane with X-shaped outrigger |
| CN103754779A (en) * | 2013-12-31 | 2014-04-30 | 浙江三一装备有限公司 | Crawler crane and anti-backswept safety support legs thereof |
| CN106276641A (en) * | 2016-08-31 | 2017-01-04 | 徐州重型机械有限公司 | Body frame structure for automotive and crane |
| CN107043071A (en) * | 2016-06-03 | 2017-08-15 | 利勃海尔爱茵根有限公司 | Telescopic joint with variable extension assembling edge |
-
2011
- 2011-12-09 CN CN2011205147733U patent/CN202379600U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431915A (en) * | 2011-12-09 | 2012-05-02 | 徐州重型机械有限公司 | X-shaped outrigger for crane and crane with X-shaped outrigger |
| CN102431915B (en) * | 2011-12-09 | 2013-09-04 | 徐州重型机械有限公司 | X-shaped outrigger for crane and crane with X-shaped outrigger |
| CN103754779A (en) * | 2013-12-31 | 2014-04-30 | 浙江三一装备有限公司 | Crawler crane and anti-backswept safety support legs thereof |
| CN107043071A (en) * | 2016-06-03 | 2017-08-15 | 利勃海尔爱茵根有限公司 | Telescopic joint with variable extension assembling edge |
| CN107043071B (en) * | 2016-06-03 | 2021-12-03 | 利勃海尔爱茵根有限公司 | Expansion joint with variable extension assembly edge |
| CN106276641A (en) * | 2016-08-31 | 2017-01-04 | 徐州重型机械有限公司 | Body frame structure for automotive and crane |
| CN106276641B (en) * | 2016-08-31 | 2018-08-28 | 徐州重型机械有限公司 | Body frame structure for automotive and crane |
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