CN102729883B - Tank-transport truck - Google Patents
Tank-transport truck Download PDFInfo
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- CN102729883B CN102729883B CN201210251670.1A CN201210251670A CN102729883B CN 102729883 B CN102729883 B CN 102729883B CN 201210251670 A CN201210251670 A CN 201210251670A CN 102729883 B CN102729883 B CN 102729883B
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- demountable tanker
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Abstract
The invention provides a tank-transport truck, comprising at least two hoisting oil cylinders, at least one movable oil cylinder and a leg supporting device. The tank-transport truck further comprises a hoisting oil cylinder hydraulic loop; the hoisting oil cylinder hydraulic loop comprises at least two hoisting oil cylinders and a reversing valve; a flow divider valve is arranged on an oil inlet path between the reversing valve and at least two hoisting oil cylinders; the flow divider valve is used for controlling oil liquid flow flowing into at least two hoisting oil cylinders, so as to adjust the balance when the two hoisting oil cylinders are hoisted. With the adoption of the technical scheme provided by the invention, the gravity of the tank-transport truck can be located at a security position all along in a process of operating a cylindrical silo by the tank-transport truck, so that the occurrence of the overturn accident is prevented.
Description
Technical field
The present invention relates to fluid control field, in particular to a kind of demountable tanker carrier.
Background technology
Demountable tanker carrier is lifted in the process of powder tank at the back of the body, the center-of-gravity position filling on car load is higher, and center-of-gravity position changes also very greatly, particularly in the time of back of the body weight lifting type powder tank, easily occur because load is overweight, tilting of car body, device distortion cause the accident that car load is tumbled or turn on one's side in deviation of gravity center center.
Therefore, need a kind of new demountable tanker carrier, can ensure that demountable tanker carrier is in the process of operation silo, car load center of gravity, all the time in perch, prevents roll-over accident.
Summary of the invention
The present invention, just based on the problems referred to above, has proposed a kind of demountable tanker carrier, can ensure that demountable tanker carrier is in the process of operation silo, and car load center of gravity, all the time in perch, prevents roll-over accident.
In view of this, the present invention proposes a kind of demountable tanker carrier, comprise at least two elevating rams, at least one Shift cylinder, support leg device, described demountable tanker carrier also comprises: elevating ram hydraulic circuit, at least two elevating rams and change-over valve described in comprising, wherein: on the in-line between described change-over valve and described at least two elevating rams, be provided with flow divider valve, described flow divider valve is for controlling the fluid flow of at least two elevating rams described in inflow, the balance while carrying out lifting action with at least two elevating rams described in regulating.
In this technical scheme, due in the process of lifting silo, the load of lifting arm elevating ram is very large, and load variations is also very large, easily occurs that lifting arm moves nonsynchronous phenomenon, and then cause lifting arm to be out of shape, even cause car load to tumble or turn on one's side, by flow divider valve is set, can ensure that demountable tanker carrier both sides lifting arm elevating ram is not subject to the impact of load, synchronized operation, and then ensure that car body can not deform, tumbles or turn on one's side.
In technique scheme, preferably, also comprise: tilt detection unit, for detection of the real-time inclination situation of described demountable tanker carrier; Whether controller, is connected to described tilt detection unit and described support leg device, will turn on one's side according to demountable tanker carrier described in described real-time inclination situation analysis, if so, described support leg device is regulated.
In this technical scheme, detect and control by the inclination situation to car body, and then in real time by regulating support leg device height to regulate car body balance, guarantee demountable tanker carrier is not tumbled or turns on one's side.
In above-mentioned arbitrary technical scheme, preferably, described tilt detection unit comprises obliquity sensor.
In above-mentioned arbitrary technical scheme, preferably, described obliquity sensor obtains the real-time inclination angle of described demountable tanker carrier; Described controller compares described real-time inclination angle and default security standpoint scope, in the situation that described real-time inclination angle exceeds described security standpoint scope, judge that described demountable tanker carrier will turn on one's side, and described support leg device is sent to corresponding control signal, to regulate described support leg device.
In this technical scheme, particularly, the inclination angle of car body is detected and controlled, and then regulate the inclination angle of car body that car body is horizontal by adjusting support leg device height in real time, guarantee demountable tanker carrier is not tumbled or turns on one's side.If car body is in the process of operation silo, obliquity sensor records car body and tilts to the left 3 °, and the security standpoint scope of car body is 0 ° to 2 °, so, adjust support leg device, make car body left side supporting leg rising certain altitude or right side supporting leg reduce certain altitude, to reach balance.
In above-mentioned arbitrary technical scheme, preferably, described obliquity sensor is arranged on the crossbeam of described support leg device.
In this technical scheme, for some parts, no matter demountable tanker carrier in travel or stop, knapsack or put in the process of tank, all the time can not occur up and down or the action of left and right, such as vehicle chassis, supporting leg crossbeam etc., therefore,, by obliquity sensor being arranged on to these parts, avoid occurring erroneous judgement.
In above-mentioned arbitrary technical scheme, preferably, also comprise speed detector, wherein: described speed detector is for obtaining the real-time speed of described demountable tanker carrier; And described controller is according to described real-time inclination angle and described real-time speed from described obliquity sensor, obtain the real-time rollover moment of described demountable tanker carrier, be greater than default torque threshold in described real-time rollover moment, judge that described demountable tanker carrier will turn on one's side.
In this technical scheme, the overall center of gravity of demountable tanker carrier and silo is higher, in turn inside diameter process, if speed is excessive, the centnifugal force of car load also can be excessive, and the centrifugal moment that centnifugal force produces at car load center of gravity place also can be excessive, easily makes demountable tanker carrier and silo to the rollover of bend outside.By the detection to real-time inclination angle and real-time speed, can calculate in Vehicle Driving Cycle process, especially the real-time moment in turning process, whether thereby determining vehicle will tumble or turn on one's side in the process of moving, and in the time will tumbling or turn on one's side, make respective operations, ensure car load balance, normally travel.
In above-mentioned arbitrary technical scheme, preferably, described tilt detection unit comprises pressure sensor.
In above-mentioned arbitrary technical scheme, preferably, described support leg device comprises left side supporting leg and right side supporting leg, and described pressure sensor obtains respectively the real-time pressure of described left side supporting leg and described right side supporting leg; Described controller is according to the real-time relativeness of the real-time pressure of the real-time pressure of described left side supporting leg and described right side supporting leg, in described real-time relativeness and the unmatched situation of default relativeness, judge that described demountable tanker carrier will turn on one's side, and described support leg device is sent to corresponding control signal, to regulate described support leg device.
In this technical scheme, by real-time pressure relation and the preset relation of left side supporting leg and right side supporting leg are contrasted, and then the height of adjusting in real time support leg device regulates car body in stress balance state, ensures that demountable tanker carrier do not tumble or turn on one's side.If car body is in the process of operation silo, the ratio that pressure sensor records the left side pressure of supporting leg and the pressure of right side supporting leg is 1.5, and the pressure ratio of two default side legs is 0.8 to 1.25, obviously, left side supporting leg receives that pressure is bigger than normal, adjust support leg device, make left side supporting leg rising certain altitude or make right side supporting leg reduce certain altitude, so that the ratio of the pressure of silo to left and right supporting leg is in preset range.
In above-mentioned arbitrary technical scheme, preferably, also comprise: Tip element, in the situation that judging that described demountable tanker carrier will be tumbled or turn on one's side, sends information.
In this technical scheme, information can be warning information, such as carrying out alarm by the mode such as sound, light, also can be the prompting to operating personal, can be in the situation that demountable tanker carrier will be tumbled or turn on one's side alert, such as prompting user is slowed down and gone slowly or stop lifting action to silo etc., thereby when supporting leg regulates automatically, operating personal also can operate accordingly, further avoids demountable tanker carrier to tumble or turn on one's side.
In above-mentioned arbitrary technical scheme, preferably, also comprise: by pass valve, be arranged in the described residing hydraulic circuit of at least one Shift cylinder, in the time that described demountable tanker carrier moves silo by described at least one Shift cylinder, be greater than default weight threshold in the weight of described silo, by the overflow of described by pass valve, to stop the action of described Shift cylinder.
In this technical scheme, in the time silo being carried out to knapsack action, first need to will be placed on ground silo by Shift cylinder and upwards mention, if but silo weight is excessive, and the centrifugal castor producing so easily causes car load to be tumbled backward.By add by pass valve on the hydraulic circuit of Shift cylinder, can ensure that pressure oil flows out through by pass valve in the time that silo weight exceedes preset weight threshold value, Shift cylinder can not move silo, has guaranteed that demountable tanker carrier can not tumble.
By above technical scheme, can ensure that demountable tanker carrier is in the process that operates silo or travel, car load center of gravity, all the time in perch, prevents roll-over accident.
Brief description of the drawings
Fig. 1 shows the structural representation of demountable tanker carrier according to an embodiment of the invention;
Fig. 2 is the right elevation of the demountable tanker carrier of the embodiment shown in Fig. 1;
Fig. 3 is the structural representation of the internal hydraulic pressure system of the demountable tanker carrier of the embodiment shown in Fig. 1;
Fig. 4 is the transmission schematic diagram of the control signal of the anti-overturning system of the demountable tanker carrier of the embodiment shown in Fig. 1.
Corresponding relation between component names and Reference numeral in Fig. 1 to Fig. 4 is:
1 support leg device; 2 obliquity sensors; 3 silos; 5 elevating rams; 8 crossbeams; 9 Shift cylinders; 10 pressure sensors; 11 left side supporting legs; 12 right side supporting legs; 13 by pass valves; 14 flow divider valves; 15 Tip elements; 16 speed detectors; 21,22,23,24 control cock.
Detailed description of the invention
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Fig. 1 and Fig. 2 show the structural representation of demountable tanker carrier according to an embodiment of the invention, and wherein, Fig. 2 is the right elevation of demountable tanker carrier shown in Fig. 1.
As shown in the figure, this demountable tanker carrier comprises: tilt detection unit, for detection of the real-time inclination situation of demountable tanker carrier; Whether controller, is connected to the support leg device 1 of tilt detection unit and demountable tanker carrier, will turn on one's side according to real-time inclination situation analysis demountable tanker carrier, if so, support leg device 1 is regulated.
In this technical scheme, detect and control by the inclination situation to demountable tanker carrier, and then in real time by regulating the height of support leg device 1 to regulate the balance of demountable tanker carrier, guarantee demountable tanker carrier is not turned on one's side.
In technique scheme, tilt detection unit can be obliquity sensor 2.Obtain the real-time inclination angle of demountable tanker carrier by obliquity sensor 2; Controller compares real-time inclination angle and default security standpoint scope, in the situation that inclination angle exceeds security standpoint scope in real time, judges that demountable tanker carrier will turn on one's side, and support leg device 1 is sent to corresponding control signal, to regulate support leg device 1.
In this technical scheme, particularly, by the inclination angle of demountable tanker carrier is detected and controlled, so in real time by adjust support leg device 1 highly regulate the inclination angle of demountable tanker carrier that demountable tanker carrier is horizontal or safety inclination angle within the scope of, ensure demountable tanker carrier do not tumble.
In the process that the inclination angle of demountable tanker carrier is detected, obliquity sensor 2 can be arranged on the crossbeam 8 of support leg device 1.
Particularly, if demountable tanker carrier is moving to silo 3 ground or carry out in the process of knapsack action being placed on ground silo 3 from demountable tanker carrier, obliquity sensor 2 records demountable tanker carrier and tilts to the left 3 °, and the security standpoint scope of demountable tanker carrier is 0 ° to 2 °, so, adjust support leg device 1, make left side supporting leg 11 rising certain altitudes or the right side supporting leg 12 of demountable tanker carrier reduce certain altitude, to reach balance.
In this technical scheme, for some parts, under normal circumstances, no matter demountable tanker carrier in travel or stop, knapsack or put in the process of tank, all the time can not occur up and down or the action of left and right, such as crossbeam 8 of vehicle chassis, support leg device 1 etc., therefore, by obliquity sensor 2 is arranged on to these parts, avoid occurring erroneous judgement.
In technique scheme, also comprise speed detector 16, wherein: speed detector is for obtaining the real-time speed of demountable tanker carrier; And controller is according to real-time inclination angle and real-time speed from obliquity sensor, obtains the real-time rollover moment of demountable tanker carrier, be greater than default torque threshold in the moment of turning on one's side in real time, judgement demountable tanker carrier will be turned on one's side.
In this technical scheme, the overall center of gravity of demountable tanker carrier and silo 3 is higher, in turn inside diameter process, if speed is excessive, the centnifugal force of car load also can be excessive, and the centrifugal moment that centnifugal force produces at car load center of gravity place also can be excessive, easily makes demountable tanker carrier and silo 3 to the rollover of bend outside.By the detection to real-time inclination angle and real-time speed, can calculate in Vehicle Driving Cycle process, especially the real-time moment in turning process, whether thereby determining vehicle will tumble or turn on one's side in the process of moving, and in the time will tumbling or turn on one's side, make respective operations, such as turning to or deceleration etc., to ensure car load balance, normally travel.
In technique scheme, tilt detection unit can be pressure sensor 10.
In technique scheme, support leg device 1 comprises left side supporting leg 11 and right side supporting leg 12, and pressure sensor 10 obtains respectively the real-time pressure of left side supporting leg 11 and right side supporting leg 12; Controller is according to the real-time relativeness of the real-time pressure of the real-time pressure of left side supporting leg 11 and right side supporting leg 12, in real-time relativeness and the unmatched situation of default relativeness, judgement demountable tanker carrier will be turned on one's side, and support leg device 1 is sent to corresponding control signal, to regulate described support leg device 1.
In this technical scheme, by real-time pressure relation and the preset relation of left side supporting leg 11 and right side supporting leg 12 are contrasted, and then the height of adjusting in real time support leg device 1 regulates car body in stress balance state, ensure that demountable tanker carrier do not tumble or turn on one's side.If demountable tanker carrier is moving to silo 3 ground or carry out in the process of knapsack action being placed on ground silo 3 from demountable tanker carrier, the ratio that pressure sensor records the left side pressure of supporting leg 11 and the pressure of right side supporting leg 12 is 1.5, and the pressure ratio of two default side legs is 0.8 to 1.25, obviously, left side supporting leg 11 receives that pressure is bigger than normal, adjust support leg device 1, make left side supporting leg 11 rising certain altitudes or make right side supporting leg 12 reduce certain altitude, so that the ratio of the pressure of silo 3 to left and right supporting leg is in preset range.
In above-mentioned arbitrary technical scheme, also comprise: Tip element, in the situation that judging that demountable tanker carrier will be tumbled or turn on one's side, sends information.
In this technical scheme, information can be warning information, such as carrying out alarm by the mode such as sound, light, also can be the prompting to operating personal, can be in the situation that demountable tanker carrier will be tumbled or turn on one's side alert, such as prompting user is slowed down and gone slowly or stop lifting action to silo etc., thereby when supporting leg regulates automatically, operating personal also can operate accordingly, further avoids demountable tanker carrier to tumble or turn on one's side.
Due in technique scheme, in the process of lifting silo 3, elevating ram 5 loads of lifting arm are very large, and load variations is also very large, easily occur that lifting arm moves nonsynchronous phenomenon, and then cause lifting arm distortion, even cause car load to tumble or turn on one's side.In order to prevent the generation of above-mentioned accident, below in conjunction with Fig. 3, specific embodiment is elaborated.
Fig. 3 is the structural representation of the internal hydraulic pressure system of the demountable tanker carrier of the embodiment shown in Fig. 1.
As shown in Figure 3, control cock 21,22,23,24 can adopt electro-hydraulic proportional valve, control respectively at least two elevating rams 5, at least one Shift cylinder 9, left side supporting leg 11 and right side supporting legs 12, can realize the leveling of system, particularly, in the situation that tilt detection unit detects that demountable tanker carrier will be tumbled, such as demountable tanker carrier will be tumbled left, transmit control signal to control cock 23,24 by controller, control left side supporting leg 11 rises or right side supporting leg 12 declines, to realize the car body balance of demountable tanker carrier.Also can be by corresponding control cock to close corresponding oil circuit, thus realize the locking to corresponding control object.
On the hydraulic circuit between control cock 21 and elevating ram 5, be provided with flow divider valve 14, control the pressure oil flow of multiple elevating rams 5, make elevating ram 5 in the time that load is larger, still can synchronized operation, avoid car body deform, tumble or turn on one's side.
On the hydraulic circuit between control cock 22 and Shift cylinder 9, be provided with by pass valve 13, when mobile silo, if silo weight is larger, the pressure oil in loop will be flowed out by by pass valve 13, and Shift cylinder 9 can not move silo, avoids demountable tanker carrier to tumble.
Particularly, in the time silo being carried out to knapsack action, first need to will be placed on ground silo by Shift cylinder 9 and move, make it built on stilts, if but silo weight is excessive, and the centrifugal castor producing so easily causes car load to be tumbled backward.By adding by pass valve 13 on the hydraulic circuit at Shift cylinder 9, can ensure that, in the time that silo weight exceedes preset weight threshold value, pressure oil flows out through by pass valve 13, Shift cylinder 9 can not move silo, has guaranteed that demountable tanker carrier can not tumble.
Fig. 4 is the transmission schematic diagram of the control signal of the anti-overturning system of the demountable tanker carrier of the embodiment shown in Fig. 1.
As shown in Figure 4, in the time of demountable tanker carrier run-off the straight, obliquity sensor 2 will detect the real-time angle of inclination of demountable tanker carrier, and contrast with security standpoint scope, if angle of inclination exceedes security standpoint scope, by controller concrete operations left side supporting leg 11 and/or right side supporting leg 12, the angle of inclination of car body is adjusted within the scope of security standpoint on the one hand, sends information by Tip element 15 on the other hand, make operating personal also can make corresponding operating to the inclination of demountable tanker carrier and regulate.
In Vehicle Driving Cycle process, the real-time speed detecting is sent to controller by speed detector 16, by analysis, calculate centrifugal moment and whether exceed safe range, if exceed safe range, give a warning or point out to chaufeur by Tip element 15, travelling with interior thereby reduce as early as possible demountable tanker carrier speed to safe range.
More than be described with reference to the accompanying drawings technical scheme of the present invention, considered that demountable tanker carrier in correlation technique easily occurs because load is overweight in the back of the body is lifted the process of powder tank and powder transport tank, tilting of car body, device be out of shape and cause the accident that car load is tumbled or turn on one's side in deviation of gravity center center.The present invention proposes a kind of new demountable tanker carrier, can ensure that demountable tanker carrier is in the process that operates silo or travel, and car load center of gravity, all the time in perch, prevents roll-over accident.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a demountable tanker carrier, comprises at least two elevating rams, at least one Shift cylinder, support leg device, it is characterized in that, described demountable tanker carrier also comprises:
Elevating ram hydraulic circuit, at least two elevating rams and change-over valve described in comprising, wherein:
On the in-line between described change-over valve and described at least two elevating rams, be provided with flow divider valve, described flow divider valve is for controlling the fluid flow of at least two elevating rams described in inflow, the balance while carrying out lifting action with at least two elevating rams described in regulating;
Described demountable tanker carrier also comprises:
Tilt detection unit, for detection of the real-time inclination situation of described demountable tanker carrier;
Whether controller, is connected to described tilt detection unit and described support leg device, will turn on one's side according to demountable tanker carrier described in described real-time inclination situation analysis, if so, described support leg device is regulated;
Described tilt detection unit comprises obliquity sensor, and described obliquity sensor obtains the real-time inclination angle of described demountable tanker carrier;
Described controller compares described real-time inclination angle and default security standpoint scope, in the situation that described real-time inclination angle exceeds described security standpoint scope, judge that described demountable tanker carrier will turn on one's side, and described support leg device is sent to corresponding control signal, to regulate described support leg device;
Described demountable tanker carrier also comprises: speed detector, wherein:
Described speed detector is for obtaining the real-time speed of described demountable tanker carrier; And
Described controller is according to described real-time inclination angle and described real-time speed from described obliquity sensor, obtain the real-time rollover moment of described demountable tanker carrier, be greater than default torque threshold in described real-time rollover moment, judge that described demountable tanker carrier will turn on one's side.
2. demountable tanker carrier according to claim 1, is characterized in that, described obliquity sensor is arranged on the crossbeam of described support leg device.
3. demountable tanker carrier according to claim 1, is characterized in that, described tilt detection unit comprises pressure sensor.
4. demountable tanker carrier according to claim 3, is characterized in that, described support leg device comprises left side supporting leg and right side supporting leg, and described pressure sensor obtains respectively the real-time pressure of described left side supporting leg and described right side supporting leg;
Described controller is according to the real-time relativeness of the real-time pressure of the real-time pressure of described left side supporting leg and described right side supporting leg, in described real-time relativeness and the unmatched situation of default relativeness, judge that described demountable tanker carrier will turn on one's side, and described support leg device is sent to corresponding control signal, to regulate described support leg device.
5. according to the demountable tanker carrier described in any one in claim 1 to 4, it is characterized in that, also comprise:
Tip element, in the situation that judging that described demountable tanker carrier will be tumbled or turn on one's side, sends information.
6. according to the demountable tanker carrier described in any one in claim 1 to 4, it is characterized in that, also comprise:
By pass valve, be arranged in the described residing hydraulic circuit of at least one Shift cylinder, in the time that described demountable tanker carrier moves silo by described at least one Shift cylinder, be greater than default weight threshold in the weight of described silo, by the overflow of described by pass valve, to stop the action of described Shift cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210251670.1A CN102729883B (en) | 2012-07-19 | 2012-07-19 | Tank-transport truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210251670.1A CN102729883B (en) | 2012-07-19 | 2012-07-19 | Tank-transport truck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102729883A CN102729883A (en) | 2012-10-17 |
| CN102729883B true CN102729883B (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210251670.1A Expired - Fee Related CN102729883B (en) | 2012-07-19 | 2012-07-19 | Tank-transport truck |
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| CN (1) | CN102729883B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108248480B (en) * | 2018-02-09 | 2024-01-02 | 长沙智能驾驶研究院有限公司 | Dump truck, control method thereof and computer readable storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2134992Y (en) * | 1992-09-17 | 1993-06-02 | 北京经济学院 | Automatic leveling device of crane |
| CN102381230A (en) * | 2011-08-23 | 2012-03-21 | 三一重工股份有限公司 | Demountable tanker truck and hydraulic system thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1395533A1 (en) * | 1986-07-04 | 1988-05-15 | Ленинградский Политехнический Институт Им.М.И.Калинина | Dump vehicle for carrying concrete mix |
| DE102008020777B4 (en) * | 2008-04-25 | 2022-09-29 | Franz Xaver Meiller Fahrzeug- Und Maschinenfabrik - Gmbh & Co Kg | Skip loader with overload protection |
| CN101927675A (en) * | 2010-09-07 | 2010-12-29 | 三一汽车起重机械有限公司 | Suspension system control method, suspension system and crane with same |
| CN202089047U (en) * | 2011-06-20 | 2011-12-28 | 三一重工股份有限公司 | Construction machine and supporting leg system thereof |
| CN202806522U (en) * | 2012-07-19 | 2013-03-20 | 三一重工股份有限公司 | Tank transport truck |
-
2012
- 2012-07-19 CN CN201210251670.1A patent/CN102729883B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2134992Y (en) * | 1992-09-17 | 1993-06-02 | 北京经济学院 | Automatic leveling device of crane |
| CN102381230A (en) * | 2011-08-23 | 2012-03-21 | 三一重工股份有限公司 | Demountable tanker truck and hydraulic system thereof |
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| CN102729883A (en) | 2012-10-17 |
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Granted publication date: 20140910 Termination date: 20180719 |