CN102029033A - Folding arm support and elevating fire truck comprising same - Google Patents
Folding arm support and elevating fire truck comprising same Download PDFInfo
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- CN102029033A CN102029033A CN200910174528XA CN200910174528A CN102029033A CN 102029033 A CN102029033 A CN 102029033A CN 200910174528X A CN200910174528X A CN 200910174528XA CN 200910174528 A CN200910174528 A CN 200910174528A CN 102029033 A CN102029033 A CN 102029033A
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Abstract
The invention discloses a folding arm support which comprises a main arm, a folding arm, a connecting member and an amplitude-changing mechanism for driving the folding arm to carry out amplitude-changing operation relative to the main arm, wherein one end of the connecting member is fixedly connected with the front part of the main arm, and the other end of the connecting member transversely extends out of the side of the main arm; and the folding arm and the other end of the connecting member are hinged at a first hinge point, and the amplitude-changing mechanism is arranged between the folding arm and the connecting member so as to drive the folding arm to carry out the amplitude-changing operation. The relative position relationship between the main arm and the folding arm is in a parallel state approximately, thereby enabling the withdrawn folding arm to be positioned on the side of the main arm; under the state, the folding arm does not occupy the overall height of the folding arm support, the overall height of the folding arm support is the height of the main arm basically, and the height space of overall design can be effectively saved. On the basis, the invention further provides an elevating fire truck comprising the arm support.
Description
Technical field
The present invention relates to technical field of engineering machinery, be specifically related to a kind of foldable arm rack and have the elevating fire truck of this jib.
Background technology
The pipeline of lifting arm support and conveying fire-fighting liquid is installed on the chassis special of existing elevating fire truck, and in the actual job process, the expansion lifting arm support is delivered to certain height with fire-fighting liquid and carries out high-altitude fire extinguishing operation.The structure of the lifting arm support of elevating fire truck mainly contains three kinds of forms at present: one, principal arm add the folding arm combined type jib of a joint; Its two, the more piece foldable arm rack; Its three, by the folding combined type jib of 2 groups of principal arms.More than three kinds of jib structure forms have common characteristic: jib structure all adopts the mo(u)ld bottom half flipe to put mode.
See also Fig. 1, the figure shows the basic structure that principal arm adds folding arm combined type jib, the principal arm shown in the figure is a telescopic arm; Under the retracted state, folding arm joint is positioned at the below of telescopic boom principal arm.
Relevant regulations has been made the requirement of limit for height for fire fighting truck, that is, the car load height can not be above 4 meters; Because determining of the cab heights of chassis special, therefore, the design that last mo(u)ld bottom half flipe is put the jib of mode just is subjected to corresponding limitation, has limited the depth of section of jib; And the size in cross section particularly depth of section determining strength and stiffness in the jib vertical plane.
Jib based on elevating fire truck carries out force analysis as can be known, and jib stress mainly produces based on jib deadweight, and side direction wind carries with to turn round inertia force relative less; Obviously, at weights such as jibs and satisfy under the operating mode of side sway rigidity, depth of section is big more, and the strength and stiffness of jib are big more, and performance indications such as the operation height of car load and amplitude are good more; Otherwise then performance is poor more.Hence one can see that, and the existing arrangement of going up the folding arm of mo(u)ld bottom half has become the biggest obstacle that restriction improves the transaction capabilities fire fighting truck.
In view of this, demand urgently being optimized design, with the problem of coordinating to limit mutually between car load height and the jib depth of section at jib structure.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is that a kind of foldable arm rack of structure optimization is provided, and folding arm is positioned at the side of principal arm when being in retracted state, thereby effectively reduces the whole height of jib.On this basis, the present invention also provides a kind of elevating fire truck with this jib.
Foldable arm rack provided by the invention comprises principal arm, folding arm, connecting elements and is used to drive folding arm carries out the luffing operation with respect to principal arm jib lubbing mechanism; Wherein, an end of described connecting elements is fixedlyed connected with the anterior of principal arm, and its other end crosses out the side to described principal arm; And the other end of described folding arm and described connecting elements is articulated in first hinge, and described jib lubbing mechanism places between described folding arm and the connecting elements, carries out the luffing operation to drive folding arm.
Preferably, described jib lubbing mechanism specifically comprises luffing connecting rod, pull bar and telescoping cylinder; Wherein, an end of described luffing connecting rod and described connecting elements are articulated in second hinge; And along the short transverse of connecting elements, second hinge is positioned at the top of first hinge; One end of described pull bar and the middle part of described luffing connecting rod are articulated in tri-joint mechanism, and its other end and described folding arm are articulated in the 4th hinge; And along the length direction of described folding arm, the 4th hinge is positioned at the inboard of first hinge; The other end of the cylinder rod end of described telescoping cylinder or cylinder barrel end and described luffing connecting rod is articulated in the 5th hinge, and its cylinder barrel end or cylinder rod end and described folding arm are articulated in the 6th hinge; And along the length direction of described folding arm, the 6th hinge is positioned at the inboard of the 4th hinge.
Preferably, when described folding arm was in retracted state, its bearing of trend was consistent with the bearing of trend of described principal arm, and both lower surfaces roughly are positioned at identical height.
Preferably, when described folding arm was in retracted state, first hinge and the 4th hinge roughly were in the same horizontal plane, and second hinge, tri-joint mechanism, the 5th hinge and the 6th hinge roughly are in the same horizontal plane.
Preferably, described folding arm is provided with hinged attached seat, and the 6th hinge between described telescoping cylinder and the folding arm is positioned on this hinged attached seat.
Preferably, when described folding arm was in retracted state, the piston of described telescoping cylinder and cylinder barrel bottom offseted.
Preferably, when the piston of described telescoping cylinder and cylinder cap offseted, the angle between the bearing of trend of described folding arm and the bearing of trend of described principal arm was 170 °～175 °.
Preferably, described principal arm is specially the telescopic arm by more piece box-shaped arm intussusception, and fixedlys connected with described connecting elements in the front portion of its internal layer arm joint; Described folding arm is specially single-unit arm joint or by the telescopic arm of more piece box-shaped arm intussusception.
Preferably, the main body of described connecting elements is a box structure.
Elevating fire truck provided by the invention comprises chassis and foregoing foldable arm rack.
Foldable arm rack provided by the invention is provided with connecting elements between principal arm and telescopic arm, this connecting elements is horizontally set between principal arm and the folding arm, the one end is fixedlyed connected with the front portion of principal arm and its other end is used for and it is hinged to fold arm, thereby the bearing of trend of realizing principal arm and folding arm roughly is parastate; Like this, when the folding arm of foldable arm rack was in retracted state, folding arm was positioned at the side of principal arm.Under this state, folding arm does not take the whole height of foldable arm rack, and the whole height of foldable arm rack is the principal arm height substantially.Obviously, under the prerequisite based on identical chassis and applying working condition, compared with prior art, use foldable arm rack of the present invention and can effectively save the height space of master-plan, thereby can improve the strength and stiffness of jib in vertical plane to greatest extent, the security reliability of guaranteeing to lift high fire-fighting operation.
In preferred version of the present invention, jib lubbing mechanism specifically comprises luffing connecting rod, pull bar and telescoping cylinder; In theory, described luffing connecting rod, pull bar and telescoping cylinder and folding arm and connecting elements (principal arm) constitute the plane five-bar mechanism.Wherein, folding arm and connecting elements are hinged; The luffing rod hinge connection is between connecting elements and telescoping cylinder, and the other end of telescoping cylinder and folding arm are hinged; Pull bar is articulated between luffing connecting rod and the folding arm.During evolutionary operation, pressure oil enters the rodless cavity of telescoping cylinder, telescoping cylinder promotes folding arm with respect to connecting elements rotation forward, meanwhile, pull bar drives the luffing connecting rod with respect to connecting elements rotation in the same way, and then the telescoping cylinder of drive and luffing rod hinge connection moves in the lump, launches fully until folding arm.This preferred version has five members, and reasonable in design, reliable drives in the process of folding arm expansion more smooth and easy, the no dead point of movement locus that the utilization coupler-point curve is guaranteed folding arm at telescoping cylinder.
Connecting elements in another preferred version of the present invention is specially box structure, and so design can reduce the deadweight of jib, thereby can effectively ensure the bearing capacity of foldable arm rack under the prerequisite that satisfies the strength and stiffness requirement.
Foldable arm rack provided by the invention is applicable to the work mechanism that carries out the lifting operation, is specially adapted to elevating fire truck.
Description of drawings
Fig. 1 is the annexation schematic diagram that principal arm adds folding arm combined type jib in the prior art;
Fig. 2 and Fig. 3 all are side views of elevating fire truck described in the specific embodiment; Wherein, the foldable arm rack shown in Fig. 2 is in retracted state, and the foldable arm rack shown in Fig. 3 is in deployed condition;
Fig. 4 and Fig. 5 show the annexation of each parts of foldable arm rack described in the specific embodiment respectively; Wherein, Fig. 4 is the partial side view of foldable arm rack, and Fig. 5 is the partial top view of foldable arm rack;
Fig. 6 is the motion principle figure of the five-bar mechanism of plane described in the specific embodiment;
Fig. 7 is the view of folding arm expansion process described in the specific embodiment;
Fig. 8 is the view that folding arm launches fully described in the specific embodiment.
Shown in Fig. 2 to Fig. 8:
The specific embodiment
The version that adds folding arm combined type jib based on existing principal arm, the present invention has carried out optimal design, its core is the change of principal arm and folding arm relative position relation, both roughly are the parastate setting, thereby be positioned at the side of principal arm after making folding arm regain, under this state, folding arm does not take the whole height of foldable arm rack, the whole height of foldable arm rack is the principal arm height substantially, thereby can effectively save the height space of master-plan.
Related herein laterally, the noun of locality such as front portion, be to be the benchmark definition with the visual angle of operator before the car; The use that should be appreciated that the described noun of locality should not limit the scope that the application asks for protection.
Being without loss of generality, is that example specifies present embodiment in conjunction with Figure of description below with the elevating fire truck.
See also Fig. 2 and Fig. 3, elevating fire truck mainly comprises chassis 100, foldable arm rack 200 and corresponding dynamical system, electric control system, hydraulic control system (not shown) etc.Wherein, the foldable arm rack of elevating fire truck shown in Fig. 2 is in retracted state, and the foldable arm rack 200 of elevating fire truck shown in Fig. 3 is in deployed condition, and principal arm 1 is propped under the effect of principal arm amplitude oil cylinder 4, and folding arm 2 launches under the effect of jib lubbing mechanism 3.Need to prove that main function components such as chassis 100 and corresponding dynamical system, electric control system, hydraulic control system and prior art are identical, those skilled in the art can realize fully that based on prior art this paper repeats no more.Present embodiment will elaborate the composition and the annexation of foldable arm rack 200.
See also Fig. 4 and Fig. 5, show each parts annexation of the described foldable arm rack of present embodiment respectively; Wherein, Fig. 4 is the partial side view of foldable arm rack, and Fig. 5 is the partial top view of foldable arm rack.
Shown in the figure, the principal arm 1 of foldable arm rack 200 and the bearing of trend of folding arm 2 roughly are the parastate setting, and wherein, principal arm 1 is the telescopic arm by more piece box-shaped arm intussusception, and folding arm 2 is single-unit arm joint.Connecting elements 5 is with respect to the bearing of trend horizontally set of jib, and the one end is fixedlyed connected with the anterior of principal arm 1 internal layer arm joint 11, the end of its other end and folding arm 2 hinged (folding arm 2 is articulated in the first hinge A with connecting elements 5); Jib lubbing mechanism 3 places between folding arm 2 and the connecting elements 5, carries out luffing operation (as shown in Figure 3) to drive folding arm 2 with respect to principal arm 1.In fact, principal arm 1 also can adopt the on-telescopic structure, and folding arm 2 also can adopt the telescopic arm by more piece box-shaped arm intussusception, uses needs all in the scope that the application asks for protection as long as satisfy.
Particularly, as shown in Figure 4, jib lubbing mechanism 3 specifically comprises luffing connecting rod 31, pull bar 32 and telescoping cylinder 33, and this luffing connecting rod 31, pull bar 32 and telescoping cylinder 33 constitute the plane five-bar mechanism with folding arm 2 and connecting elements 5 (principal arm).
One end of luffing connecting rod 31 and connecting elements 5 are articulated in the second hinge B; And along the short transverse of connecting elements 5, the second hinge B is positioned at the top of the first hinge A; One end of pull bar 32 and the middle part of luffing connecting rod 31 are articulated in tri-joint mechanism C, and the other end of pull bar 32 and folding arm 2 are articulated in the 4th hinge D; And along the length direction of folding arm 2, the 4th hinge D is positioned at the inboard of the first hinge A; The cylinder rod end of telescoping cylinder 33 and the other end of luffing connecting rod 31 are articulated in the 5th hinge E, and the cylinder barrel end of telescoping cylinder 33 and folding arm 2 are articulated in the 6th hinge F; And along the length direction of folding arm 2, the 6th hinge F is positioned at the inboard of the 4th hinge D.Be understandable that the cylinder barrel end that also can telescoping cylinder 33 and the other end of luffing connecting rod 31 are hinged, the cylinder rod end and the folding arm 2 of telescoping cylinder 33 are hinged.Particularly, folding arm 2 is provided with hinged attached seat 21, and the 6th hinge F between telescoping cylinder 33 and the folding arm 2 is positioned on this hinged attached seat 21.
Briefly explain the process of organizing work that folds arm 2 below in conjunction with Fig. 6, Fig. 6 is the motion principle figure of this plane five-bar mechanism.
In conjunction with shown in Figure 6, the motion matching relationship between telescoping cylinder 33 and the folding arm 2 is slider-crank mechanism.During evolutionary operation, pressure oil enters the rodless cavity of telescoping cylinder 33, the cylinder bar of telescoping cylinder 33 stretches out and promotes folding arm 2 with respect to connecting elements 5 rotation forward, as shown in phantom in Figure 6, pull bar 32 drives luffing connecting rod 31 with respect to connecting elements 5 rotation in the same way, and then drive and luffing connecting rod 31 hinged telescoping cylinders 33 move (as shown in Figure 7) in the lump, launch (as shown in Figure 8) fully until folding arm 2.This mechanism design rationally, reliably drives in the process of folding arm 2 expansion at telescoping cylinder 33, and the utilization coupler-point curve guarantees to fold more smooth and easy, the no dead point of movement locus of arm 2.
According to the design basis of saving the overall height space to greatest extent, preferably, when folding arm 2 was in retracted state, its bearing of trend was consistent with the bearing of trend of principal arm 1, and both lower surfaces roughly are positioned at identical height.When folding arm 2 was in retracted state, the first hinge A and the 4th hinge D roughly were in the same horizontal plane, and the second hinge B, tri-joint mechanism C, the 5th hinge E and the 6th hinge F roughly are in the same horizontal plane.
For improving the security and stability of folding arm 2 evolutionary operations, should and launch two maximal work positions fully and carry out spacingly based on the withdrawal of folding arm 2, produce interference to avoid its hyperkinesia and adjacent component.Such as, can be such design: when folding arm 2 was in retracted state, the piston of telescoping cylinder 33 and cylinder barrel bottom offset, to realize the spacing of its retracted state; When the piston of telescoping cylinder 33 and cylinder cap offseted, the angle between the bearing of trend of folding arm and the bearing of trend of principal arm is 170 °～175 °, and was spacing to realize that it launches fully.
What specify is, when the piston of telescoping cylinder 33 and cylinder cap offseted, the bearing of trend of folding arm was defined as 170 °～175 ° with angle between the bearing of trend of principal arm, with the requirement of satisfying working space and to make that amplitude oil cylinder is in stressed than rational position.
In addition, the main body of connecting elements 5 can be selected multiple version for use, preferred box structure.Obviously, be, can under the prerequisite that satisfies the strength and stiffness requirement, reduce the deadweight of jib, effectively ensure the bearing capacity of foldable arm rack based on the characteristics of box structure.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. foldable arm rack comprises principal arm, folding arm and is used to drive folding arm with respect to the jib lubbing mechanism that principal arm carries out the luffing operation, it is characterized in that, also comprises:
Connecting elements, the one end is fixedlyed connected with the anterior of principal arm, and its other end crosses out the side to described principal arm; And
The other end of described folding arm and described connecting elements is articulated in first hinge, and described jib lubbing mechanism places between described folding arm and the connecting elements, carries out the luffing operation to drive folding arm.
2. foldable arm rack according to claim 1 is characterized in that, described jib lubbing mechanism specifically comprises:
The luffing connecting rod, one end and described connecting elements are articulated in second hinge; And along the short transverse of connecting elements, second hinge is positioned at the top of first hinge;
Pull bar, the middle part of one end and described luffing connecting rod is articulated in tri-joint mechanism, and its other end and described folding arm are articulated in the 4th hinge; And along the length direction of described folding arm, the 4th hinge is positioned at the inboard of first hinge; With
Telescoping cylinder, the other end of its cylinder rod end or cylinder barrel end and described luffing connecting rod is articulated in the 5th hinge, and its cylinder barrel end or cylinder rod end and described folding arm are articulated in the 6th hinge; And along the length direction of described folding arm, the 6th hinge is positioned at the inboard of the 4th hinge.
3. foldable arm rack according to claim 2 is characterized in that, when described folding arm was in retracted state, its bearing of trend was consistent with the bearing of trend of described principal arm, and both lower surfaces roughly are positioned at identical height.
4. foldable arm rack according to claim 3, it is characterized in that, when described folding arm was in retracted state, first hinge and the 4th hinge roughly were in the same horizontal plane, and second hinge, tri-joint mechanism, the 5th hinge and the 6th hinge roughly are in the same horizontal plane.
5. foldable arm rack according to claim 4 is characterized in that, described folding arm is provided with hinged attached seat, and the 6th hinge between described telescoping cylinder and the folding arm is positioned on this hinged attached seat.
6. foldable arm rack according to claim 3 is characterized in that, when described folding arm was in retracted state, the piston of described telescoping cylinder and cylinder barrel bottom offseted.
7. foldable arm rack according to claim 6 is characterized in that, when the piston of described telescoping cylinder and cylinder cap offseted, the angle between the bearing of trend of described folding arm and the bearing of trend of described principal arm was 170 °～175 °.
8. according to each described foldable arm rack in the claim 1 to 7, it is characterized in that described principal arm is specially the telescopic arm by more piece box-shaped arm intussusception, and fixedly connected with described connecting elements in the front portion of its internal layer arm joint; Described folding arm is specially single-unit arm joint or by the telescopic arm of more piece box-shaped arm intussusception.
9. foldable arm rack according to claim 8 is characterized in that, the main body of described connecting elements is a box structure.
10. elevating fire truck comprises chassis and lifting arm support, it is characterized in that, described lifting arm support adopts as each described foldable arm rack in the claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910174528XA CN102029033B (en) | 2009-09-28 | 2009-09-28 | Folding arm support and elevating fire truck comprising same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910174528XA CN102029033B (en) | 2009-09-28 | 2009-09-28 | Folding arm support and elevating fire truck comprising same |
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| CN102029033A true CN102029033A (en) | 2011-04-27 |
| CN102029033B CN102029033B (en) | 2012-07-18 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537028A (en) * | 2013-09-29 | 2014-01-29 | 安徽华印机电股份有限公司 | Elevation arm of firefighting truck |
| CN105584942A (en) * | 2015-11-24 | 2016-05-18 | 徐州重型机械有限公司 | Crane arm and crane |
| CN107253695A (en) * | 2017-08-17 | 2017-10-17 | 湖南星邦重工有限公司 | Aerial lift device and its fly jib system |
| CN108502752A (en) * | 2018-05-23 | 2018-09-07 | 河南卫华特种车辆有限公司 | A kind of multistage luffing and flexible foldable arm support |
| CN110075453A (en) * | 2019-06-05 | 2019-08-02 | 三一汽车制造有限公司 | Fire fighting truck |
| CN110090379A (en) * | 2019-06-05 | 2019-08-06 | 三一汽车制造有限公司 | Arm support component and fire fighting truck |
| CN110251868A (en) * | 2019-08-07 | 2019-09-20 | 安徽沪宁智能科技有限公司 | The arm beam assembly of height spray firefighting fire extinguishing robot |
| WO2020244008A1 (en) * | 2019-06-05 | 2020-12-10 | 三一汽车制造有限公司 | Fire engine |
| WO2020244007A1 (en) * | 2019-06-05 | 2020-12-10 | 三一汽车制造有限公司 | Arm support assembly and fire engine |
| CN112158784A (en) * | 2020-10-30 | 2021-01-01 | 徐州徐工随车起重机有限公司 | Multi-platform foldable tunnel maintenance operation device |
| CN113521615A (en) * | 2021-06-28 | 2021-10-22 | 福建侨龙应急装备股份有限公司 | Fluid conveying device middle arm frame limiting device and fire engine |
| CN114642849A (en) * | 2022-05-23 | 2022-06-21 | 徐工消防安全装备有限公司 | Telescopic boom structure and elevating fire truck thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2389680Y (en) * | 1999-09-10 | 2000-08-02 | 抚顺市起重机总厂 | Multifunctional lifting jet fire engine |
| CN2877768Y (en) * | 2006-01-26 | 2007-03-14 | 杨连平 | Folding fire engine |
| JP2010534176A (en) * | 2007-07-24 | 2010-11-04 | ラーッパナ，エスコ | Vehicle and lift arm assembly |
| CN201505382U (en) * | 2009-09-28 | 2010-06-16 | 徐州重型机械有限公司 | Folding arm support and elevating fire truck having the arm support |
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2009
- 2009-09-28 CN CN200910174528XA patent/CN102029033B/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537028A (en) * | 2013-09-29 | 2014-01-29 | 安徽华印机电股份有限公司 | Elevation arm of firefighting truck |
| CN105584942A (en) * | 2015-11-24 | 2016-05-18 | 徐州重型机械有限公司 | Crane arm and crane |
| CN107253695B (en) * | 2017-08-17 | 2023-11-17 | 湖南星邦智能装备股份有限公司 | Aerial working equipment and fly arm system thereof |
| CN107253695A (en) * | 2017-08-17 | 2017-10-17 | 湖南星邦重工有限公司 | Aerial lift device and its fly jib system |
| CN108502752A (en) * | 2018-05-23 | 2018-09-07 | 河南卫华特种车辆有限公司 | A kind of multistage luffing and flexible foldable arm support |
| CN110075453A (en) * | 2019-06-05 | 2019-08-02 | 三一汽车制造有限公司 | Fire fighting truck |
| CN110090379A (en) * | 2019-06-05 | 2019-08-06 | 三一汽车制造有限公司 | Arm support component and fire fighting truck |
| WO2020244008A1 (en) * | 2019-06-05 | 2020-12-10 | 三一汽车制造有限公司 | Fire engine |
| WO2020244007A1 (en) * | 2019-06-05 | 2020-12-10 | 三一汽车制造有限公司 | Arm support assembly and fire engine |
| CN110251868A (en) * | 2019-08-07 | 2019-09-20 | 安徽沪宁智能科技有限公司 | The arm beam assembly of height spray firefighting fire extinguishing robot |
| CN112158784B (en) * | 2020-10-30 | 2021-11-23 | 徐州徐工随车起重机有限公司 | Multi-platform foldable tunnel maintenance operation device |
| CN112158784A (en) * | 2020-10-30 | 2021-01-01 | 徐州徐工随车起重机有限公司 | Multi-platform foldable tunnel maintenance operation device |
| CN113521615A (en) * | 2021-06-28 | 2021-10-22 | 福建侨龙应急装备股份有限公司 | Fluid conveying device middle arm frame limiting device and fire engine |
| CN114642849A (en) * | 2022-05-23 | 2022-06-21 | 徐工消防安全装备有限公司 | Telescopic boom structure and elevating fire truck thereof |
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| CN102029033B (en) | 2012-07-18 |
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Effective date of registration: 20170210 Address after: 221004 Jiangsu Province, Xuzhou City Yunlong District No. 165 Patentee after: Xugong fire safety equipment Co. Ltd. Address before: 221004 Xuzhou, Zhejiang Province, Jiangsu Road No. 165 Patentee before: Xuzhou Heavy Machinery Co., Ltd. |