CN103062164B - Overload protection debugging control method, overload protection debugging control device, overload protection debugging control system and engineering machine - Google Patents
Overload protection debugging control method, overload protection debugging control device, overload protection debugging control system and engineering machine Download PDFInfo
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- CN103062164B CN103062164B CN201310008175.2A CN201310008175A CN103062164B CN 103062164 B CN103062164 B CN 103062164B CN 201310008175 A CN201310008175 A CN 201310008175A CN 103062164 B CN103062164 B CN 103062164B
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Abstract
The invention discloses an overload protection debugging control method, an overload protection debugging control device, an overload protection debugging control system and an engineering machine. The method includes: acquiring input opening adjustment information of an electric proportional pressure relief valve; adjusting opening of the electric proportional pressure relief valve in a hydraulic constant-pressure system according to the opening adjustment information of the electric proportional pressure relief valve; acquiring first pressure of hydraulic the constant-pressure system when the engineering machine is at a rated speed; and when the first pressure is equal to the sum of set maximum pressure and set pressure protection increment of the hydraulic constant-pressure system, outputting debugging finished prompt information. Manual visual observation of the pressure of the hydraulic constant-pressure system is not needed, and the electric proportional pressure relief valve is adjusted through electronic control and only by manually inputting the opening adjustment information thereof by a debugging personnel. Therefore, compared with the prior art, the method, the device, the system and the engineering machine have the advantages that accuracy of set pressure calibration of the pressure relief valve is improved greatly, and further energy waste is avoided while service life of the hydraulic constant-pressure system is prolonged.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of debugging control program of overload protection, device, system and a kind of engineering machinery.
Background technique
In the hydraulic constant pressure system of the various engineering machinery such as such as concrete mixer, relief valve is as the pressure control valve of necessity, its Main Function is: when the pressure of hydraulic constant pressure system reaches the set pressure of relief valve, relief valve starts overflow, in case locking system overload, thus ensure security of system.
As shown in Figure 1, the hydraulic constant pressure system of engineering machinery generally includes: motor 4, fuel tank 10, constant pressure pump 1, tilt cylinder 3, overflow reduction valve 2 and accumulator 5.Motor 4 drives dynamical element constant pressure pump 1 to hydraulic pressure constant-voltage system fuel feeding as power source, hydraulic energy transfer is that mechanical energy is externally done work by tilt cylinder 3, when system pressure reaches the cracking pressure of overflow reduction valve 2, overflow reduction valve 2 is opened, the oil that constant pressure pump 1 is discharged flows back to fuel tank 10 through overflow reduction valve 2, to maintain the safety of hydraulic pressure constant-voltage system.
Because relief valve all exists certain cracking pressure, in the hydraulic constant pressure system of therefore current engineering machinery, the set pressure of relief valve gets the fixed value that is greater than systems constant pressure usually.When system pressure is within the scope of constant pressure, relief valve cuts out, and when system pressure reaches the set pressure of relief valve, relief valve is opened.
In the prior art, the set pressure P of relief valve is set
susual employing following steps:
One, the regulator bolts of relief valve is all opened;
Two, the system pressure P of hydraulic pressure constant-voltage system is regulated and observed pressure table, until pressure gauge display system pressure P=P
s+ △ P, usual △ P=2MPa;
Three, the regulator bolts of regulation relief valve observed pressure table, until pressure gauge display system pressure P=P
s.
The defect that the prior art exists is, in step 3, the adjustment of system pressure usually relies on commissioning staff's observed pressure table data and manually-operable completes, and degree of accuracy is lower, if be adjusted to the protection pressure of relief valve lower than set pressure P by mistake
s, the startup overflow protection that hydraulic constant pressure system will be made too early, causes the load increase of constant pressure pump, engine power rising; thus cause energy waste; in addition, wait operation if there is leakage tune, also can have influence on the working life of whole system and bring larger potential safety hazard.
Summary of the invention
The invention provides a kind of debugging control program of overload protection, device, system and a kind of engineering machinery, in order to improve the accuracy of demarcating relief valve set pressure.
The debugging control program of overload protection of the present invention, comprising:
The aperture obtaining the electric proportional pressure control valve of input regulates information;
Information is regulated to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of described electric proportional pressure control valve;
Obtain the first pressure of hydraulic constant pressure system when engineering machinery is in rated speed;
When described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging.
The debugging control device of overload protection of the present invention, comprising:
Acquisition equipment, regulates information for the aperture obtaining the electric proportional pressure control valve of input, and the first pressure of hydraulic constant pressure system when engineering machinery is in rated speed;
Control apparatus, for regulating information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of described electric proportional pressure control valve; And
When described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging.
The debugging control system of overload protection of the present invention, comprising:
Man-machine interface;
Pressure transducer, the first pressure of hydraulic constant pressure system when being in rated speed for work machine;
Control gear, is connected with man-machine interface and pressure sensor signal respectively, and the aperture for the electric proportional pressure control valve according to input interface regulates information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system; And when described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging to man-machine interface.
Engineering machinery of the present invention, comprises the debugging control system of the overload protection described in preceding solution.
In technical solution of the present invention, because control gear regulates information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of electric proportional pressure control valve, when the first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging, the pressure of hydraulic constant pressure system does not need artificial visually examine, the adjustment of electricity proportional pressure control valve is completed by automatically controlled, commissioning staff only needs the aperture manually inputting electric proportional pressure control valve to regulate information, therefore, be compared with the prior art, the accuracy that relief valve set pressure is demarcated improves greatly, thus decrease energy waste, and improve the working life of hydraulic constant pressure system.
Accompanying drawing explanation
Fig. 1 is an existing hydraulic constant pressure system architecture schematic diagram;
Fig. 2 is the schematic flow sheet of debugging control program one embodiment of overload protection of the present invention;
The hydraulic constant pressure system architecture schematic diagram that Fig. 3 applies for the present invention;
Fig. 4 is the structural representation of debugging control device one embodiment of overload protection of the present invention;
Fig. 5 is the structural representation of debugging control system one embodiment of overload protection of the present invention;
Another hydraulic constant pressure system architecture schematic diagram that Fig. 6 applies for the present invention.
Reference character:
1-constant pressure pump 2-overflow reduction valve 3-tilt cylinder 4-motor
5-accumulator 10-fuel tank 20-obtains equipment 30-control apparatus
23-control gear 24-pressure transducer 25-man-machine interface 26-electricity proportional pressure control valve
27-storage device
Embodiment
In order to improve the accuracy that relief valve set pressure is demarcated, reducing the energy waste that hydraulic constant pressure system is unnecessary, embodiments providing a kind of debugging control program of overload protection, device, system and a kind of engineering machinery.In this technological scheme, the pressure of hydraulic constant pressure system does not need artificial visually examine, and the adjustment of electric proportional pressure control valve is completed by automatically controlled, and commissioning staff only needs the aperture manually inputting electric proportional pressure control valve to regulate information, therefore, the accuracy that relief valve set pressure is demarcated improves greatly.The present invention is described with reference to the accompanying drawings below with specific embodiment.
Embodiment as shown in Figure 2, the debugging control program of overload protection of the present invention, comprising:
The aperture of the electric proportional pressure control valve of step 101, acquisition input regulates information;
Step 102, information is regulated to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of described electric proportional pressure control valve;
Step 103, obtain the first pressure of hydraulic constant pressure system when engineering machinery is in rated speed;
Step 104, judge whether the first pressure equals the setting pressure maximum of hydraulic constant pressure system and setting pressure protection increment sum, if so, performs step 105, otherwise returns step 101;
Step 105, the complete information of output debugging.
Setting pressure maximum refers to the maximum service pressure that hydraulic constant pressure system can be born, and this value is specifically determined according to test or experience, and setting pressure protection increment refers to the permission superpressure increment of hydraulic constant pressure system, and value is usually at 0 ~ 2Mpa.The aperture of described electric proportional pressure control valve regulates information can comprise polytype, the such as current adjustment of electric proportional pressure control valve, also can be the information such as the aperture regulated quantity of electric proportional pressure control valve.
As shown in Figure 3, in this embodiment, adopt electric proportional pressure control valve 26 as overload protection element, because control gear regulates information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of electric proportional pressure control valve, when the first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging, the pressure of hydraulic constant pressure system does not need artificial visually examine, the adjustment of electricity proportional pressure control valve is completed by automatically controlled, commissioning staff only needs the aperture manually inputting electric proportional pressure control valve to regulate information, therefore, be compared with the prior art, the accuracy that relief valve set pressure is demarcated improves greatly, thus decrease energy waste, and improve the working life of hydraulic constant pressure system.
As preferred embodiment, the debugging control program of overload protection of the present invention, further comprising the steps of:
Obtain the maximum pressurising pressure of hydraulic constant pressure system when engineering machinery is in the idling mode of no operatton action;
When the engineering machinery that described maximum pressurising pressure is less than setting is in the idling mode of no operatton action during the pressure maximum of hydraulic constant pressure system, output overloading protection fault cues information.
In this embodiment, when maximum pressurising pressure refers to that engineering machinery is in the idling mode of no operatton action, hydraulic constant pressure system pressure rises accessible pressure maximum, and the pressure maximum P of hydraulic constant pressure system when the engineering machinery of setting is in the idling mode of no operatton action
cusually the setting pressure maximum P of hydraulic constant pressure system is less than
e.When overload protection is normal, the pressure maximum of hydraulic constant pressure system when the engineering machinery that maximum pressurising pressure should be not less than setting is in the idling mode of no operatton action.Overload protection fault cues information can point out commissioning staff to carry out associated check (such as to electric proportional pressure control valve in time; check whether the associated components of electric proportional pressure control valve loosens or damaged), the energy waste caused because overload protection is inaccurate when greatly reducing hydraulic constant pressure system works.
As the embodiment be more preferably, the debugging control program of overload protection of the present invention, further comprising the steps of:
Search overload protection debugging recording information;
When not finding overload protection debugging recording information, exporting and debugging prompting message for the first time.
This embodiment increases self-diagnostic program; when the initial start-up of debugging control system; if the system that detects never carried out overload protection demarcate debugging, then exported and debugged prompting message for the first time, and reminded commissioning staff to carry out overload protection to hydraulic constant pressure system and demarcate debugging.
Described overload protection debugging recording information can comprise much information, the setting pressure maximum of such as hydraulic constant pressure system and setting pressure protection increment, and/or debug time etc., but be not limited to these information.
As shown in Figure 4, based on identical inventive concept, the embodiment of the present invention additionally provides a kind of debugging control device of overload protection, comprising:
Acquisition equipment 20, regulates information for the aperture obtaining the electric proportional pressure control valve of input, and the first pressure of hydraulic constant pressure system when engineering machinery is in rated speed;
Control apparatus 30, for regulating information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of described electric proportional pressure control valve; And
When described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging.
Preferably, described acquisition equipment 20, is further used for the maximum pressurising pressure obtaining hydraulic constant pressure system when engineering machinery is in the idling mode of no operatton action;
Described control apparatus 30, when being further used for the pressure maximum of the hydraulic constant pressure system when the engineering machinery that described maximum pressurising pressure is less than setting is in the idling mode of no operatton action, output overloading protection fault cues information.
More excellent, described control apparatus 30, is further used for searching overload protection debugging recording information, when not finding overload protection debugging recording information, exporting and debugging prompting message for the first time.
Wherein, described overload protection debugging recording information comprises: the setting pressure maximum of hydraulic constant pressure system and setting pressure protection increment, and/or debug time.
Preferably, the aperture adjustment information of described electric proportional pressure control valve is the current adjustment of electric proportional pressure control valve.
As shown in Figure 5, the debugging control system of the overload protection of the embodiment of the present invention, comprising:
Man-machine interface 25;
Pressure transducer 24, the first pressure of hydraulic constant pressure system when being in rated speed for work machine;
Control gear 23, is connected with man-machine interface 25 and pressure transducer 24 signal respectively, and the aperture for the electric proportional pressure control valve according to input interface 25 regulates information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system; And when described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging to man-machine interface 25.
In this embodiment, man-machine interface 25 is that user and system carry out medium that is mutual and information exchange, and its particular type is not limit, such as, can be the video terminal with keyboard and mouse, also can be the video terminal of touch-screen type.When man-machine interface 25 is video terminals of touch-screen type, screen can be provided with "+" and "-" button, commissioning staff presses the aperture adjustment information that corresponding button just can input electric proportional pressure control valve.Screen can arrange corresponding indication button further, with guide commissioning staff step by step carry out associative operation, convenience and accuracy higher.Debug the form of expression of complete information in man-machine interface 25 not limit, such as can for voice message, can for being presented at hint image on display screen etc.
Pressure transducer 24 detects the force value of hydraulic constant pressure system automatically, do not need artificial visually examine, the adjustment of electricity proportional pressure control valve is completed by automatically controlled, commissioning staff only needs the aperture manually inputting electric proportional pressure control valve to regulate information, therefore, be compared with the prior art, the accuracy that relief valve set pressure is demarcated improves greatly, thus decrease energy waste, and improve the working life of hydraulic constant pressure system.
Preferably, described pressure transducer 24, is further used for the maximum pressurising pressure of hydraulic constant pressure system when work machine is in the idling mode of no operatton action;
Described control gear 23, when being further used for the pressure maximum of the hydraulic constant pressure system when the engineering machinery that described maximum pressurising pressure is less than setting is in the idling mode of no operatton action, output overloading protection fault cues information is to man-machine interface 25.
The debugging control system of the overload protection of this embodiment; add fault self-diagnosis function; overload protection fault cues information can point out commissioning staff to carry out associated check to relief valve, the energy waste caused because overload protection is inaccurate when greatly reducing hydraulic constant pressure system works in time.The type of overload protection fault cues information is not limit, such as can for voice message, also can for being presented at hint image on display screen etc.
Preferably, the debugging control system of this overload protection, also comprises storage device 27, for storing overload protection debugging recording information;
Described control gear 23, is connected with storage device 27 signal, is further used for searching overload protection debugging recording information; When not finding overload protection debugging recording information, export first debugging prompting message to man-machine interface 25.
Storage device 27 can be discrete physical entity, also can be integrated among control gear.In like manner, the type of first debugging prompting message is not limit, such as, can be voice message, also can for being presented at hint image on display screen etc.
The step adopting debugging control system embodiment illustrated in fig. 4 to carry out overload protection debugging to the hydraulic constant pressure system shown in Fig. 3 is as follows:
One, click " debugging starts " button in man-machine interface 25, start the debugging calibrating procedure of hydraulic pressure constant-voltage system.At this moment, control gear 23 controls electric proportional pressure control valve 26 and all opens, the control electric current I under making the electric current I of electric proportional pressure control valve 26 equal standard-sized sheet
max, the pressure of the hydraulic constant pressure system detected with time-control apparatus 23 Real-time Obtaining pressure transducer 24.Now, man-machine interface 25 is by the display current value of electric proportional pressure control valve 26 and the force value of hydraulic constant pressure system;
Two, manually relevant parameter is set.At the setting pressure maximum P arranging input hydraulic pressure constant-voltage system in frame of man-machine interface 25
ewith setting pressure protection increment △ P(gets a numerical value between 0 ~ 2Mpa usually);
Three, the constant pressure pump 1 of manual tune hydraulic constant pressure system, makes the pressure of hydraulic constant pressure system raise, and observes the force value shown by man-machine interface 25, until the pressure P >P of hydraulic constant pressure system
e+ △ P;
Four, in man-machine interface 25, press the Current adjustment button "-" of electric proportional pressure control valve, at this moment debugging control system will reduce the current value of electric proportional pressure control valve according to certain slope, continue to press Current adjustment button "-", as the pressure P=P of hydraulic constant pressure system
eduring+△ P, man-machine interface 25 will show " debugging complete " button.If now press "+" or "-" button, the electric current of electric proportional pressure control valve 26 can only of setting more among a small circle in finely tune, be generally used for rounding setting;
Five, click " debugging complete " button, the debugging completing overload protection is demarcated.Now, can manual tune constant pressure pump 1, make the pressure of hydraulic constant pressure system be in normal working.
Known by above-mentioned steps, after the debugging completing overload protection is demarcated, the set pressure P of electric proportional pressure control valve 26
sbe greater than the setting pressure maximum P of hydraulic constant pressure system
e, therefore, the situation that relief valve can be avoided to start overflow protection too early occurs, and the accuracy that relief valve set pressure is demarcated is higher, greatly reduces energy waste.
As shown in Figure 6, in this embodiment, hydraulic constant pressure system comprises the overflow reduction valve 2 of connecting with electric proportional pressure control valve 26.The debugging step of overload protection is as follows:
Manually overflow reduction valve 2 is all opened;
Carry out debugging according to above-mentioned steps one to step 5 to electric proportional pressure control valve 26 to demarcate;
The pressure regulating spring of manual tune overflow reduction valve 2, and observe the force value shown by man-machine interface 25, until this force value equals set pressure P simultaneously
srear stopping;
Electric proportional pressure control valve 26 is removed.
After debugging is demarcated; electricity proportional pressure control valve 26 can remove, overflow reduction valve 2 using the overload protection element as hydraulic constant pressure system, therefore; this embodiment's scheme, while guarantee relief valve set pressure demarcates accuracy, further saves equipment cost.
The engineering machinery that the embodiment of the present invention provides, comprises the debugging control system of the overload protection described in preceding solution.The type of described engineering machinery is not limit; can be such as concrete pump, concrete Vehicle loaded pump (adding chassis compared to concrete pump) or concrete mixer (adding chassis and jib compared to concrete pump) etc.; the debugging demarcation of its hydraulic constant pressure system overload protection is comparatively accurate; greatly reduce energy waste, the working life of hydraulic constant pressure system is higher.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (17)
1. a debugging control program for overload protection, is characterized in that, comprising:
The aperture obtaining the electric proportional pressure control valve of input regulates information;
Information is regulated to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of described electric proportional pressure control valve;
Obtain the first pressure of hydraulic constant pressure system when engineering machinery is in rated speed;
When described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging.
2. debugging control program as claimed in claim 1, is characterized in that, also comprise:
Obtain the maximum pressurising pressure of hydraulic constant pressure system when engineering machinery is in the idling mode of no operatton action;
When the engineering machinery that described maximum pressurising pressure is less than setting is in the idling mode of no operatton action during the pressure maximum of hydraulic constant pressure system, output overloading protection fault cues information.
3. debugging control program as claimed in claim 1, is characterized in that, also comprise:
Search overload protection debugging recording information;
When not finding overload protection debugging recording information, exporting and debugging prompting message for the first time.
4. debugging control program as claimed in claim 3, it is characterized in that, described overload protection debugging recording information comprises: the setting pressure maximum of hydraulic constant pressure system and setting pressure protection increment, and/or debug time.
5. the debugging control program as described in any one of Claims 1 to 4, is characterized in that, the aperture adjustment information of described electric proportional pressure control valve is the current adjustment of electric proportional pressure control valve.
6. a debugging control device for overload protection, is characterized in that, comprising:
Acquisition equipment (20), regulates information for the aperture obtaining the electric proportional pressure control valve of input, and the first pressure of hydraulic constant pressure system when engineering machinery is in rated speed;
Control apparatus (30), for regulating information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system according to the aperture of described electric proportional pressure control valve; And
When described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging.
7. debugging control device as claimed in claim 6, is characterized in that,
Described acquisition equipment (20), is further used for the maximum pressurising pressure obtaining hydraulic constant pressure system when engineering machinery is in the idling mode of no operatton action;
Described control apparatus (30), when being further used for the pressure maximum of the hydraulic constant pressure system when the engineering machinery that described maximum pressurising pressure is less than setting is in the idling mode of no operatton action, output overloading protection fault cues information.
8. debugging control device as claimed in claim 6, is characterized in that,
Described control apparatus (30), is further used for searching overload protection debugging recording information, when not finding overload protection debugging recording information, exporting and debugging prompting message for the first time.
9. debugging control device as claimed in claim 8, it is characterized in that, described overload protection debugging recording information comprises: the setting pressure maximum of hydraulic constant pressure system and setting pressure protection increment, and/or debug time.
10. the debugging control device as described in any one of claim 6 ~ 9, is characterized in that, the aperture adjustment information of described electric proportional pressure control valve is the current adjustment of electric proportional pressure control valve.
The debugging control system of 11. 1 kinds of overload protections, is characterized in that, comprising:
Man-machine interface (25);
Pressure transducer (24), the first pressure of hydraulic constant pressure system when being in rated speed for work machine;
Control gear (23), be connected with man-machine interface (25) and pressure transducer (24) signal respectively, the aperture for the electric proportional pressure control valve according to input interface (25) regulates information to regulate the aperture of electric proportional pressure control valve in hydraulic pressure constant-voltage system; And when described first pressure equals setting pressure maximum and the setting pressure protection increment sum of hydraulic constant pressure system, export the complete information of debugging to man-machine interface (25).
12. debugging control systems as claimed in claim 11, is characterized in that,
Described pressure transducer (24), is further used for the maximum pressurising pressure of hydraulic constant pressure system when work machine is in the idling mode of no operatton action;
Described control gear (23); when being further used for the pressure maximum of the hydraulic constant pressure system when the engineering machinery that described maximum pressurising pressure is less than setting is in the idling mode of no operatton action, output overloading protection fault cues information is to man-machine interface (25).
13. debugging control systems as claimed in claim 11, is characterized in that, also comprise storage device (27), for storing overload protection debugging recording information;
Described control gear (23), is connected with storage device (27) signal, is further used for searching overload protection debugging recording information; When not finding overload protection debugging recording information, export first debugging prompting message to man-machine interface (25).
14. debugging control systems as described in any one of claim 11 ~ 13, it is characterized in that, described hydraulic constant pressure system comprises the overflow reduction valve (2) of connecting with electric proportional pressure control valve (26).
15. 1 kinds of engineering machinery, is characterized in that, comprise the debugging control system of the overload protection as described in any one of claim 11 to 14.
16. engineering machinery as claimed in claim 15, it is characterized in that, described engineering machinery is concrete pump.
17. engineering machinery as claimed in claim 15, it is characterized in that, described engineering machinery is concrete Vehicle loaded pump or concrete mixer.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103807245A (en) * | 2014-01-21 | 2014-05-21 | 广西柳工机械股份有限公司 | Electric proportional overflow cushion valve for engineering machines |
| CN104831930B (en) * | 2014-12-19 | 2017-04-05 | 北汽福田汽车股份有限公司 | Pumping control method, device, system and concrete mixer |
| CN107420381B (en) * | 2017-03-17 | 2018-11-23 | 北京交通大学 | A kind of caliberating device of servo valve temperature screen system |
| CN109319663B (en) * | 2018-12-06 | 2020-09-15 | 中联重科股份有限公司 | Control method and device for crane and crane |
| CN111536092B (en) * | 2020-04-03 | 2022-08-09 | 湖南双达机电有限责任公司 | Hydraulic system, method for adjusting hydraulic system, and engineering vehicle |
| CN112924166B (en) * | 2021-03-17 | 2023-01-06 | 潍柴动力股份有限公司 | Overflow valve fault detection method and device, electronic equipment and storage medium |
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