CN102080999A - Engineering vehicle and device for detecting stress of supporting leg thereof - Google Patents
Engineering vehicle and device for detecting stress of supporting leg thereof Download PDFInfo
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- CN102080999A CN102080999A CN2009102465411A CN200910246541A CN102080999A CN 102080999 A CN102080999 A CN 102080999A CN 2009102465411 A CN2009102465411 A CN 2009102465411A CN 200910246541 A CN200910246541 A CN 200910246541A CN 102080999 A CN102080999 A CN 102080999A
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- supporting leg
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Abstract
The invention discloses a device for detection the stress of a supporting leg of an engineering vehicle. The device comprises a detection switch for detecting the stress of the supporting leg of the engineering vehicle, wherein the supporting leg comprises a fixed supporting leg (1) fixedly connected with the body of the engineering vehicle and a vertical oil cylinder (2) arranged on the external end part of the fixed supporting leg; when the supporting leg is under the non-working state, a predetermined distance is formed between the fixed support leg (1) and the vertical oil cylinder (2); when the supporting leg is under the working state, the distance between the fixed support leg (1) and the vertical oil cylinder (2) is smaller than the predetermined distance; the detection switch measures the stress of the supporting leg according to the distance change between the fixed support leg (1) and the vertical oil cylinder (2). The device for detecting the stress of the supporting leg can detect the stress of the supporting leg conveniently, and the detection result is accurate and reliable. The invention further provides an engineering vehicle comprising the device for detecting the stress of the supporting leg.
Description
Technical field
The present invention relates to the engineering machinery detection range, particularly relate to a kind of supporting leg strained detection device that is used for engineering truck.In addition, the invention still further relates to a kind of engineering truck that comprises above-mentioned supporting leg strained detection device.
Background technology
Along with the fast development of China's economic construction, various engineering trucks continue to bring out, and are applied to a plurality of industries.
When engineering trucks such as high-altitude operation vehicle were got on the bus operation at needs, getting off must have the stressed signal feedback of supporting leg in the manipulation of getting on the bus, and gets on the bus and could move, and can't operate otherwise get on the bus.Judge that supporting leg whether stressed needs provide a judgment value to detector switch, stressed or when not stressing, this judgment value can change when supporting leg.
In the prior art the stressed detection of the supporting leg of engineering truck many according to the gap between fixed supporting leg and the movable supporting legs as judgment value, detector switch detects the variable quantity in gap when supporting leg is stressed, then with stressed signal feedback in the operation of getting on the bus.
But a kind of supporting leg of common engineering truck has only fixed supporting leg and does not have a movable supporting legs in the prior art, and vertical oil cylinder is directly installed on the fixed supporting leg, and the supporting leg of this class formation can not be with the variable quantity in gap between movable supporting legs and the fixed supporting leg as judgment value.Therefore, can only adopt the detector switch of being with stay cord at this class supporting leg, detector switch is fixed on the supporting leg dish, along with oil cylinder stretches and stretches, detector switch is realized the stressed detection of supporting leg by the distance that detects supporting leg and ground.
Because detector switch is flexible with oil cylinder, the ponding of the easy kiss the earth of detector switch causes detector switch malfunctioning; And the stay cord that is hung on the vertical oil cylinder is easy to be tangled by the ground exposure, and testing process is dangerous, and testing result is also unreliable.
Therefore, how improving the safe reliability of the stressed detection of supporting leg of engineering truck, is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of supporting leg strained detection device that is used for engineering truck, this supporting leg strained detection device can detect the stressing conditions of supporting leg easily, and testing result accurately and reliably.Another object of the present invention provides a kind of engineering truck that comprises above-mentioned supporting leg strained detection device.
For achieving the above object, the invention provides a kind of supporting leg strained detection device, be used for engineering truck, comprise the stressed detector switch of supporting leg that is used to detect described engineering truck, described supporting leg comprises the fixed supporting leg of fixedlying connected with the car body of described engineering truck, and the vertical oil cylinder of being located at the outer end of described fixed supporting leg; When described supporting leg is in off working state, has predetermined distance between described fixed supporting leg and the described vertical oil cylinder; When described supporting leg was in running order, the distance between described fixed supporting leg and the described vertical oil cylinder was less than described predetermined distance; It is stressed that described detector switch is measured described supporting leg according to the variable in distance between described fixed supporting leg and the described vertical oil cylinder.
Preferably, comprise that also two ends support the elastic device of described fixed supporting leg and described vertical oil cylinder respectively; When described supporting leg was in running order, the decrement of described elastic device was less than or equal to described predetermined distance.
Preferably, the outer end of described fixed supporting leg has first flange, and described vertical oil cylinder has second flange that cooperates with described first flange, and the two ends of described elastic device are supported described first flange and described second flange respectively.
Preferably, described second flange has the groove that holds described elastic device, so that described supporting leg is when in running order, described first flange is adjacent to described second flange.
Preferably, described first flange is connected by coupling assembling with described second flange, and described elastic device has center pit, and described coupling assembling passes described center pit and connects described first flange and described second flange.
Preferably, the number of described elastic device and described coupling assembling all is at least two, and circumferentially evenly distributing along described vertical oil cylinder.
Preferably, described elastic device is specially the dish spring.
Preferably, described coupling assembling comprises studs, is set in the nut and the pad of described studs periphery.
The present invention also provides a kind of engineering truck, comprises as above-mentioned each described supporting leg strained detection device.
Preferably, be specially elevating fire truck.
The supporting leg of engineering truck provided by the present invention comprises fixed supporting leg and vertical oil cylinder.Wherein, fixed supporting leg is fixedlyed connected with the car body of engineering truck, and vertical oil cylinder is located at the outer end of fixed supporting leg, and when engineering truck was worked, vertical oil cylinder was used for the propping works vehicle, to improve the job stability of engineering truck.Detector switch utilizes the variable in distance of fixed supporting leg and vertical oil cylinder to measure the stressing conditions of supporting leg.When supporting leg is in off working state, have predetermined distance between fixed supporting leg and the vertical oil cylinder, detector switch detects less than signal, gets on the bus and can not move; When supporting leg was in running order, fixed supporting leg can diminish with distance between the vertical oil cylinder, and less than above-mentioned predetermined distance, detector switch can detect the stressing conditions of supporting leg, gets on the bus and can operate.Because detector switch is to measure the supporting leg stressing conditions according to the distance between fixed supporting leg and the vertical oil cylinder, so, detector switch can not remain and contact with ground, its stay cord is not influenced by the ground exposure can yet, so can guarantee that detector switch can be not malfunctioning because of kiss the earth ponding, thereby can effectively improve the reliability and the security of stressed detection, improve the reliability that engineering truck is got on the bus and operated.
A kind of preferred embodiment in, be provided with elastic device between described fixed supporting leg and the vertical oil cylinder, the two ends of this elastic device are support fixation supporting leg and vertical oil cylinder respectively, and when supporting leg was in running order, the decrement of elastic device was less than or equal to described predetermined distance.Owing between vertical oil cylinder and fixed supporting leg, elastic device is set, this elastic device can form stable anchorage force between vertical oil cylinder and fixed supporting leg, can effectively reduce the engineering truck play of vertical oil cylinder in the process of moving, thereby improve the stability of vertical oil cylinder, improve the reliability and the serviceable life of supporting leg.
A kind of preferred embodiment in, the outer end of described fixed supporting leg has first flange, described vertical oil cylinder has second flange that matches with described first flange, the two ends of described elastic device are supported described first flange and described second flange respectively.In present technology in common a kind of leg structure, fixed supporting leg links together by first flange and second flange that cooperatively interacts with vertical oil cylinder, the two ends of elastic device are supported first flange and second flange respectively, just improve a little on the basis of existing technology and can realize purpose of the present invention, its improvement amount is little, the improvement cost is low, helps technology popularization of the present invention.
In another preferred embodiment, described first flange is connected by coupling assembling with described second flange, and described elastic device has center pit, and described coupling assembling passes described center pit and connects described first flange and described second flange.Like this, coupling assembling passes second flange on the vertical oil cylinder, the center pit of elastic device successively, is connected to then on first flange of fixed supporting leg, finishes being connected of vertical oil cylinder and fixed supporting leg.This is simple in structure, is easy to assembling, and can avoid elastic device horizontal play between vertical oil cylinder and fixed supporting leg, improves the stability of elastic device, improves the maintainability of the stressed detection of supporting leg.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of supporting leg strained detection device provided by the present invention;
Fig. 2 is the partial enlarged drawing of A part among Fig. 1;
Fig. 3 is the height change synoptic diagram of elastic device provided by the present invention.
Embodiment
A core of the present invention provides a kind of supporting leg strained detection device that is used for engineering truck, and this supporting leg strained detection device can detect the stressing conditions of supporting leg easily, and testing result accurately and reliably.Another core of the present invention provides a kind of engineering truck that comprises above-mentioned supporting leg strained detection device.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of embodiment of supporting leg strained detection device provided by the present invention.
The supporting leg of engineering truck comprises fixed supporting leg 1 and vertical oil cylinder 2, wherein, fixed supporting leg 1 is fixedlyed connected with the car body of engineering truck, vertical oil cylinder 2 is located at the outer end of fixed supporting leg 1, when engineering truck is worked, vertical oil cylinder 2 is used for the propping works vehicle, to improve the job stability of engineering truck.
Supporting leg strained detection device provided by the present invention, its detector switch is according to the stressing conditions of the range observation supporting leg between fixed supporting leg 1 and the vertical oil cylinder 2.When supporting leg is in off working state, have predetermined distance between fixed supporting leg 1 and the vertical oil cylinder 2, detector switch detects less than signal, gets on the bus and can not move; When supporting leg was in running order, fixed supporting leg 1 can diminish with distance between the vertical oil cylinder 2, and less than above-mentioned predetermined distance, detector switch can detect the stressing conditions of supporting leg, gets on the bus and can operate.Because detector switch is to measure the supporting leg stressing conditions according to the distance between fixed supporting leg 1 and the vertical oil cylinder 2, so, detector switch can not remain and contact with ground, its stay cord is not influenced by the ground exposure can yet, so can guarantee that detector switch can be not malfunctioning because of kiss the earth ponding, thereby can effectively improve the reliability and the security of stressed detection, improve the reliability that engineering truck is got on the bus and operated.
Need to prove that outer end as herein described is that the car body axis with engineering truck is that benchmark defines, near the axis be in, away from the axis be outside.The noun of locality that is to be understood that herein to be adopted should not limit the protection domain of this patent.
In a kind of concrete embodiment, can between fixed supporting leg 1 and vertical oil cylinder 2, elastic device 3 be set, this elastic device 3 forms anchorage force between fixed supporting leg 1 and vertical oil cylinder 2, in the time of can making supporting leg be in off working state, guarantee to have predetermined distance between fixed supporting leg 1 and the vertical oil cylinder 2; When supporting leg is in running order, vertical oil cylinder 2 stretches out and supports ground, improves the job stability of engineering truck, and vertical oil cylinder 2 is stressed to reduce the distance between itself and the fixed supporting leg 1, elastic device 3 pressurizeds, its decrement are less than or equal to above-mentioned predetermined distance.Because elastic device 3 can form stable anchorage force between vertical oil cylinder 2 and fixed supporting leg 1, can effectively reduce the engineering truck play of vertical oil cylinder 2 in the process of moving, thereby improve the stability of vertical oil cylinder 2, the reliability and the serviceable life of improving supporting leg.
Please refer to Fig. 2, Fig. 2 is the partial enlarged drawing of A part among Fig. 1.
In a kind of concrete embodiment, the outer end of fixed supporting leg 1 has first flange 11, and vertical oil cylinder 2 has second flange 21 that matches with first flange 11, and the two ends of elastic device 3 are supported first flange 11 and second flange 21 respectively.In present technology in the common leg structure, fixed supporting leg 1 links together by first flange 11 and second flange 21 that cooperatively interacts with vertical oil cylinder 2, the two ends of elastic device 3 are supported first flange 11 and second flange 21 respectively, as long as just improve a little on the basis of existing technology and can realize purpose of the present invention, its improvement amount is little, the improvement cost is low, helps technology popularization of the present invention.
Obviously, fixed supporting leg 1 can also have other connected mode with vertical oil cylinder 2, also can elastic device 3 be set in other place between fixed supporting leg 1 and the vertical oil cylinder 2, when as long as supporting leg is not worked, the distance that this elastic device 3 can make fixed supporting leg 1 and vertically can keep between the oil cylinder 2 being scheduled to, detector switch detects less than being subjected to force signal, gets on the bus and can not operate; And the gap between supporting leg when work fixed supporting leg 1 and the vertical oil cylinder 2 can be reduced, detector switch can detect and be subjected to force signal, gets on the bus and can operate, and just can satisfy basic demand of the present invention.
Please refer to Fig. 3, Fig. 3 is the height change synoptic diagram of elastic device provided by the present invention.
Particularly, can on second flange 21 groove 211 be set, elastic device 3 is placed in the groove 211, and when making supporting leg in running order, first flange 11 can be adjacent to second flange 21.When supporting leg was in off working state, the height of elastic device 3 was an inoperative height H 1; When supporting leg is in running order, elastic device 3 can produce certain decrement, it highly becomes working depth H2, working depth H2 is the difference of the decrement of non-working depth H1 and elastic device 3, when the working depth H2 of elastic device 3 equals the height of groove 211, between fixed supporting leg 1 and the vertical oil cylinder 2 apart from vanishing, at this moment, detector switch detects the force signal that is subjected to of supporting leg, gets on the bus and can operate.
Obviously, the groove that holds elastic device 3 can be arranged on first flange 11, and this moment, the height of groove equated with groove height on being arranged on second flange 21; Perhaps can on the position of first flange 11 and second flange, 21 correspondences groove be set all, the height after two groove fit are good equates with groove height on being located at first flange 11 or second flange 21 separately.Suchlike structure can both realize purpose of the present invention, and basic thought all according to the invention all should be within protection scope of the present invention.
And, the groove that can not hold elastic device 3 between first flange 11 and second flange 21, promptly the distance between fixed supporting leg 1 and the vertical oil cylinder 2 can not reach zero, as long as when supporting leg is stressed, detector switch can detect the force signal that is subjected to of supporting leg, just can satisfy requirement of the present invention.
In the concrete embodiment of another kind, first flange 11 can be connected by coupling assembling 4 with second flange 21, and elastic device 3 can have center pit, and the center pit that coupling assembling 4 passes elastic device 3 connects first flange 11 and second flange 21.Like this, coupling assembling 4 passes second flange 21 on the vertical oil cylinder 2, the center pit of elastic device 3 successively, is connected to then on first flange 11 of fixed supporting leg 1, finishes being connected of vertical oil cylinder 2 and fixed supporting leg 1.This is simple in structure, is easy to assembling, and can avoid elastic device 3 horizontal play between vertical oil cylinder 2 and fixed supporting leg 1, improves the stability of elastic device 3, improves the reliability of supporting leg strained detection device.
Obviously, elastic device 3 is not on the suit coupling assembling 4, the mounting hole that promptly holds the groove 211 of elastic device 3 and coupling assembling 4 can disalignment, as long as elastic device 3 can be fixed between vertical oil cylinder 2 and the fixed supporting leg 1, elastic device 3 can play the effect of effective support, just can satisfy requirement of the present invention.
But, consider the production cost of supporting leg and the convenience of elastic device 3 is installed, still elastic device 3 is sleeved on the coupling assembling 4 more conveniently, both helped reducing the production cost of supporting leg, help improving the installation effectiveness of supporting leg again.
Particularly, the number of elastic device 3 and coupling assembling 4 all can be at least two, and two or more elastic devices 3 all can be along the circumferentially evenly distribution of vertical oil cylinder 2 with coupling assembling 4, promptly upwards evenly arrange at least two elastic devices 3, equal plug-in mounting coupling assembling 4 in its center pit in the week of first flange 11 and second flange 21.Like this, the stress of fixed supporting leg 1 and 2 of vertical oil cylinders can be evenly distributed on a plurality of elastic devices 3 and a plurality of coupling assembling 4, avoids stress to concentrate, and improves the reliability of supporting leg.
In a kind of concrete embodiment, above-mentioned elastic device 3 can be the dish spring, and coupling assembling 4 is plugged in the center pit of dish spring.The dish spring can bear bigger pressure, and under uniform pressure, its deflection is littler than common spring, and distortion according to the invention needs; A plurality of dish spring serial connections can be used in combination in actual the use, make the deflection of dish spring satisfy requirement of the present invention.Obviously, elastic device can be other spring or the elastomeric element that can satisfy the stroke requirement, as long as supporting leg when being in off working state, can support vertical oil cylinder 2 and fixed supporting leg 1, making between vertical oil cylinder 2 and the fixed supporting leg 1 has certain distance, and detector switch can not detect supporting leg and be subjected to force signal; When supporting leg was in running order, the gap between vertical oil cylinder 2 and the fixed supporting leg 1 can vanishing, and detector switch can detect the force signal that is subjected to of supporting leg, made the engineering truck operation of can getting on the bus; So just can satisfy basic demand of the present invention.
Further, coupling assembling 4 as herein described can comprise studs 41 and the nut 42, the pad 43 that are set in studs 41 peripheries.Studs 41 is that a kind of two ends have screw thread and the centre is the double-screw bolt of polished rod, first one end can be screwed in the mounting hole of first flange 11 during installation, installs dish spring, second flange 21, pad 43 backs then successively at the other end nut 42 of screwing on.Obviously, the installation aperture of the center bore of dish spring, second flange 21 and the aperture of pad all should be slightly larger than the size of the polished rod of studs 41, and when guaranteeing 2 work of vertical oil cylinder, the gap between first flange 11 and second flange 21 can change.When dismounting, only need to remove the dismounting that nut 42 just can be realized fixed supporting leg 1 and vertical oil cylinder 2, make supporting leg easy to maintenance, thereby can effectively improve the maintenance efficiency of supporting leg, improve the maintainability of supporting leg.
Except above-mentioned supporting leg strained detection device, the present invention also provides a kind of engineering truck that comprises above-mentioned supporting leg strained detection device, and the structure of other each several parts of this project vehicle please refer to prior art, and this paper repeats no more.
Particularly, above-mentioned engineering truck can be an elevating fire truck.Obviously, engineering truck also can be other engineering machinery such as high-altitude operation vehicle.
More than engineering truck provided by the present invention and supporting leg strained detection device thereof are described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.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 carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. supporting leg strained detection device, be used for engineering truck, comprise the stressed detector switch of supporting leg that is used to detect described engineering truck, described supporting leg comprises the fixed supporting leg (1) of fixedlying connected with the car body of described engineering truck, and the vertical oil cylinder (2) of being located at the outer end of described fixed supporting leg, it is characterized in that when described supporting leg is in off working state, having predetermined distance between described fixed supporting leg (1) and the described vertical oil cylinder (2); When described supporting leg was in running order, the distance between described fixed supporting leg (1) and the described vertical oil cylinder (2) was less than described predetermined distance; It is stressed that described detector switch is measured described supporting leg according to the variable in distance between described fixed supporting leg (1) and the described vertical oil cylinder (2).
2. supporting leg strained detection device according to claim 1 is characterized in that, comprises that also two ends support the elastic device (3) of described fixed supporting leg (1) and described vertical oil cylinder (2) respectively; When described supporting leg was in running order, the decrement of described elastic device (3) was less than or equal to described predetermined distance.
3. supporting leg strained detection device according to claim 2, it is characterized in that, the outer end of described fixed supporting leg (1) has first flange (11), described vertical oil cylinder (2) has second flange (21) that cooperates with described first flange (11), and the two ends of described elastic device (3) are supported described first flange (11) and described second flange (21) respectively.
4. supporting leg strained detection device according to claim 3, it is characterized in that, described second flange (21) has the groove (211) that holds described elastic device (3), so that described supporting leg is when in running order, described first flange (11) is adjacent to described second flange (21).
5. according to each described supporting leg strained detection device of claim 1 to 4, it is characterized in that, described first flange (11) is connected by coupling assembling (4) with described second flange (21), described elastic device (3) has center pit, and described coupling assembling (4) passes described center pit and connects described first flange (11) and described second flange (21).
6. supporting leg strained detection device according to claim 5 is characterized in that, described elastic device (3) all is at least two with the number of described coupling assembling (4), and circumferentially evenly distributing along described vertical oil cylinder (2).
7. supporting leg strained detection device according to claim 6 is characterized in that, described elastic device (3) is specially the dish spring.
8. supporting leg strained detection device according to claim 6 is characterized in that, described coupling assembling (4) comprises studs (41), is set in the nut (42) and the pad (43) of described studs (41) periphery.
9. an engineering truck is characterized in that, comprises each described supporting leg strained detection device of claim 1 to 8.
10. engineering truck according to claim 9 is characterized in that, is specially elevating fire truck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102465411A CN102080999B (en) | 2009-11-30 | 2009-11-30 | Engineering vehicle and device for detecting stress of supporting leg thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102465411A CN102080999B (en) | 2009-11-30 | 2009-11-30 | Engineering vehicle and device for detecting stress of supporting leg thereof |
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| CN102080999A true CN102080999A (en) | 2011-06-01 |
| CN102080999B CN102080999B (en) | 2012-07-25 |
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| CN2009102465411A Active CN102080999B (en) | 2009-11-30 | 2009-11-30 | Engineering vehicle and device for detecting stress of supporting leg thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219459A (en) * | 2016-08-30 | 2016-12-14 | 湖南星邦重工有限公司 | A kind of supporting leg and aerial work platform |
| CN113108970A (en) * | 2021-03-03 | 2021-07-13 | 徐州工程学院 | Supporting leg counter-force measuring device and measuring method |
| CN114509280A (en) * | 2022-02-17 | 2022-05-17 | 徐工消防安全装备有限公司 | Engineering vehicle landing leg sinking amount detection device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4138285C2 (en) * | 1991-11-21 | 1994-04-07 | M & S Brugg Ag Brugg | Hydraulic press brake |
| DE19512868A1 (en) * | 1995-04-06 | 1996-10-10 | Metz Feuerwehrgeraete Gmbh | Device for measuring pressure force |
| CN201124826Y (en) * | 2007-12-07 | 2008-10-01 | 徐州海伦哲专用车辆有限公司 | Detecting device for special vehicle supporting leg |
| CN201280820Y (en) * | 2008-09-24 | 2009-07-29 | 三一重工股份有限公司 | Supporting leg and engineering machinery with the supporting leg |
-
2009
- 2009-11-30 CN CN2009102465411A patent/CN102080999B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219459A (en) * | 2016-08-30 | 2016-12-14 | 湖南星邦重工有限公司 | A kind of supporting leg and aerial work platform |
| CN106219459B (en) * | 2016-08-30 | 2019-06-14 | 湖南星邦重工有限公司 | A kind of supporting leg and aerial work platform |
| CN113108970A (en) * | 2021-03-03 | 2021-07-13 | 徐州工程学院 | Supporting leg counter-force measuring device and measuring method |
| CN114509280A (en) * | 2022-02-17 | 2022-05-17 | 徐工消防安全装备有限公司 | Engineering vehicle landing leg sinking amount detection device |
| CN114509280B (en) * | 2022-02-17 | 2023-11-10 | 徐工消防安全装备有限公司 | Engineering vehicle landing leg sinking amount detection device |
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| CN102080999B (en) | 2012-07-25 |
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Effective date of registration: 20170210 Address after: 221000 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. |