CN102926539B - Pumping machine and emergency driving system thereof - Google Patents
Pumping machine and emergency driving system thereof Download PDFInfo
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- CN102926539B CN102926539B CN201210438697.1A CN201210438697A CN102926539B CN 102926539 B CN102926539 B CN 102926539B CN 201210438697 A CN201210438697 A CN 201210438697A CN 102926539 B CN102926539 B CN 102926539B
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Abstract
The present invention relates to engineering machinery pumping technology field, disclose a kind of pumping machine and emergency driving system thereof.Described emergency driving system comprises distributing valve hydraulic system, also comprises hydraulic system of pump, stirs hydraulic system or jib hydraulic system; Described hydraulic system of pump, described stirring hydraulic system or be provided with emergent oil feeding line between described jib hydraulic system and described distributing valve hydraulic system, described emergent oil feeding line is used for meeting an urgent need fuel feeding to described distributing valve hydraulic system.Implement the present invention, hydraulic system of pump that pumping machine self has can be made full use of, stir hydraulic system or jib hydraulic system as emergent oil sources, and by emergent oil feeding line to distributing valve hydraulic system Contingency supply, to realize the normal work of distributing valve, ensure that pumping machine continues pump concrete, compared with prior art, improve resource utilization, also improve the performance of working continuously of pumping machine.
Description
Technical field
The present invention relates to engineering machinery pumping technology field, particularly a kind of pumping machine and emergency driving system thereof.
Background technique
Concrete mixer is the construction equipment being realized concrete conveyance by pumping mechanism, and its hydraulic system generally comprises four autonomous systems, i.e. hydraulic system of pump, jib hydraulic system, distributing valve hydraulic system and stirring hydraulic system.Wherein, it is large that the distributing valve of distributing valve hydraulic system has the compression shock that commutates, the features such as commutating frequency high (20 ~ 30 times per minute), in real work, the oil pump of distributing valve hydraulic system, the rate of fault of pressurising solenoid valve and relief valve etc. is higher, when the oil pump of distributing valve hydraulic system, when pressurising solenoid valve or relief valve etc. break down, distributing valve cannot complete and swing commutation, and then cause concrete mixer to continue pump concrete, because concrete is rapid hardening material, once there is this situation, no matter for construction party or for pump truck itself, all heavy losses may be caused, especially some building site is not just filled once cast concrete and is permitted to stop, must complete by disposal pouring, under this situation, high for the work continuously requirement of performance of pump truck.
At present, a kind of comparatively conventional method is a concrete pump for subsequent use, but causes the decline of asset of equipments efficiency like this, adds client cost.In addition, when the oil pump of distributing valve hydraulic system, pressurising solenoid valve or relief valve break down, also can take the more measure such as scavenge oil pump, pressurising solenoid valve or relief valve, or in advance for distributing valve hydraulic system installs special emergency driving equipment additional, start professional emergency driving equipment when a failure occurs and drive; In this scheme, more the cycle of scavenge oil pump, selector valve or relief valve is longer, if during without existing spare part, replacement cycle will be longer, cannot meet job site requirement, and install the emergency driving equipment of specialty in advance additional, can fix a breakdown very soon, but because frequency of utilization is low, and increase the cost of whole equipment, common customer is difficult to accept.
Therefore, the emergency driving function how for existing distributing valve hydraulic system improves, to adapt to further use needs, is those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the present invention is intended to propose a kind of pumping machine and emergency driving system thereof, to make full use of the resource of pumping machine its own system, realizes the emergency driving function of distributing valve hydraulic system.
On the one hand, the invention provides a kind of emergency driving system of pumping machine, described emergency driving system comprises distributing valve hydraulic system, also comprise hydraulic system of pump, stir hydraulic system or jib hydraulic system, and described hydraulic system of pump, described stirring hydraulic system or be provided with emergent oil feeding line between described jib hydraulic system and described distributing valve hydraulic system, described emergent oil feeding line is used for meeting an urgent need fuel feeding to described distributing valve hydraulic system.
Further, described emergent oil feeding line is provided with switch valve.
Further, described switch valve is two-position two-way solenoid valve or manually operated valve.
Further, described emergent oil feeding line is provided with reduction valve.
Further, the oiler of described emergent oil feeding line is connected in the outlet line of the oil pump of described hydraulic system of pump, described stirring hydraulic system or described jib hydraulic system, and the oil outlet of described emergent oil feeding line is connected on the in-line of described distributing valve hydraulic system.
Further, the in-line of described distributing valve hydraulic system is provided with accumulator.
On the other hand, present invention also offers a kind of pumping machine, described pumping machine is provided with the emergency driving system described in above-mentioned any one.
Further, described pumping machine is concrete mixer.
The emergency driving system of a kind of pumping machine provided by the invention, make full use of the hydraulic system of pump that pumping machine self has, stirring hydraulic system or jib hydraulic system are as emergent oil sources, when the oil pump of distributing valve hydraulic system, selector valve or relief valve break down so that cause distributing valve for want of pressure oil and cannot realize swing commutation time, can from hydraulic system of pump, stirring hydraulic system or jib hydraulic system obtain pressure oil and pass through emergent oil feeding line to distributing valve hydraulic system Contingency supply, to realize the normal work of distributing valve, ensure that pumping machine continues pump concrete, compared with prior art, cause is without the need to a pumping machine how for subsequent use, or without the need to installing corresponding dedicated emergency driving arrangement in advance additional for distributing valve hydraulic system, improve resource utilization, in addition, cause is without the need to passing through more scavenge oil pump, selector valve or relief valve etc., the impact that fault causes can be eliminated as soon as possible, improve the performance of working continuously of pumping machine, in addition, in maintenance process, if when distributing valve hydraulic system breaks down, pressure oil is introduced from hydraulic system of pump, stirring hydraulic system or jib hydraulic system to distributing valve hydraulic system by emergent oil feeding line, can judge that fault has appearred in oil pump, selector valve or relief valve, or having there is obstacle in other elements of distributing valve hydraulic system, namely improves the diagnosis capability of fault, decrease the eliminating time of fault.
A kind of pumping machine provided by the invention is provided with above-mentioned emergency driving system, and because above-mentioned emergency driving system has above-mentioned technique effect, therefore, this pumping machine also has corresponding technique effect.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
A kind of principle schematic being applied to the emergency driving system of concrete mixer that Fig. 1 provides for the embodiment of the present invention one;
A kind of principle schematic being applied to the emergency driving system of concrete mixer that Fig. 2 provides for the embodiment of the present invention two;
A kind of principle schematic being applied to the emergency driving system of concrete mixer that Fig. 3 provides for the embodiment of the present invention three;
A kind of principle schematic being applied to the emergency driving system of concrete mixer that Fig. 4 provides for the embodiment of the present invention four.
Embodiment
To it should be pointed out that in this part to the description of concrete structure and description order it is only explanation to specific embodiment, should not be considered as there is any restriction to protection scope of the present invention.In addition, when not conflicting, the embodiment in this part and the feature in embodiment can combine mutually.
Please refer to Fig. 1, a kind of emergency driving system being applied to concrete mixer that embodiment one provides at least comprises: distributing valve hydraulic system, jib hydraulic system and emergent oil feeding line 01.
Wherein, distributing valve hydraulic system comprises oil pump 1, relief valve 2, selector valve 3, one-way valve 4 and distributing valve 10 etc., the inlet port of oil pump 1 is connected to fuel tank, the oil outlet of oil pump 1 is connected to the filler opening of selector valve 3, the actuator port of selector valve 3 is connected to the entry end of one-way valve 4, and the outlet end of one-way valve 4 is connected on the in-line of distributing valve 10; Relief valve 2 is arranged in the outlet line of oil pump 1, prevents the oil pressure in the outlet line of oil pump 1 excessive; Selector valve 3 is two-position four-way solenoid valve, when obtaining electric, selector valve 3 works in right position, now, the hydraulic oil that oil pump 1 exports flows to distributing valve 10 by one-way valve 4 after selector valve 3, and when dead electricity, selector valve 3 works in left position, now, the hydraulic oil that oil pump 1 exports flows back to fuel tank by selector valve 3.
Jib hydraulic system comprises oil pump 9, one-way valve 8 and jib valve 11 etc., and the inlet port of oil pump 9 is connected to fuel tank, and oil outlet is connected to the entry end of one-way valve 8, and the outlet end of one-way valve 8 is connected on the in-line of jib valve 11.
Emergent oil feeding line 01 is arranged between jib valve 11 and distributing valve 10, emergent oil feeding line 01 is provided with switch valve 7 and reduction valve 6, specifically, the oiler of emergent oil feeding line 01 is connected on the in-line of jib valve 11, oil outlet is connected on the in-line of distributing valve 10, reduction valve 6 is between switch valve 7 and distributing valve 10, and switch valve 7 is normal close two-position two-way solenoid.Preferably, the in-line of distributing valve 10 is also provided with accumulator 5.
The following describes the working principle of above-described embodiment:
In operation process, by oil pump 9 to jib valve 11 supply pressure oil, and then realize the action of jib, when needs cast concrete, control selector valve 3 and be in obtain electricity condition, oil pump 1 is made to be continuously distributing valve 10 supply pressure oil, realized swinging commutation by distributing valve 10, to ensure concrete normal conveying, if oil pump 1, relief valve 2 or selector valve 3 break down so that cause distributing valve 10 for want of pressure oil and cannot realize swing commutation time, now, controllable switch valve 7 is in obtain electricity condition, emergent oil feeding line 01 is made to be on state, pressure oil on jib valve 11 in-line (i.e. the in-line of distributing valve hydraulic system) will flow to distributing valve 10 by emergent oil feeding line 01, realize distributing valve 10 and continue fuel feeding, normal work is continued to make distributing valve 10, thus ensure concrete normal conveying.In above process, accumulator 5 can play accumulation of energy effect, even if the instantaneous required fluid of distributing valve hydraulic system is stored in accumulator, and there is the function making outlet pressure automatically keep stable due to reduction valve 6, under emergency condition, reduction valve 6 reduces to charge oil pressure needed for distributing valve hydraulic system by making the oil pressure of jib hydraulic system side, thus ensures the normal work of distributing valve hydraulic system.In addition, in above process, one-way valve 8 can prevent the pressure oil of jib valve 11 in-line from refluxing and enter oil pump 9, and one-way valve 4 can prevent the backflow of the pressure oil of distributing valve 10 in-line from entering oil pump 1 or fuel tank.From said process, compared with prior art, in the present embodiment, cause without the need to a pumping machine how for subsequent use, or without the need to installing corresponding dedicated emergency driving arrangement in advance additional for distributing valve hydraulic system, improves resource utilization, in addition, because of without the need to passing through more scavenge oil pump, selector valve or relief valve etc., the impact that fault causes can be eliminated as soon as possible, improve the performance of working continuously of concrete mixer.
In maintenance process, if when the oil pump 1 of distributing valve hydraulic system, relief valve 2, selector valve 3 or distributing valve 10 etc. break down, pressure oil is introduced from jib hydraulic system to distributing valve hydraulic system by emergent oil feeding line 01, can judge that fault has appearred in the oil pump 1 before one-way valve 4, selector valve 3 or relief valve 2, or there is obstacle in the distributing valve 10 after one-way valve 4 or other elements being connected to distributing valve 10, namely improve the diagnosis capability of fault, decrease the eliminating time of fault.
Please refer to Fig. 2, embodiment two comprises oil pump 1, relief valve 2, selector valve 3, one-way valve 4, accumulator 5, reduction valve 6, switch valve 7, one-way valve 8, oil pump 9, distributing valve 10, jib valve 11 and emergent oil feeding line 01 etc. described in embodiment one, embodiment two is with the main difference part of embodiment one, switch valve 7 adopts manually operated valve, so that the emergency driving of operator's manually control realization distributing valve hydraulic system as required, working principle and the corresponding technique effect of embodiment two see described in embodiment one, hereby can not repeat.
Please refer to Fig. 3 and Fig. 4, and composition graphs 1, embodiment three and embodiment four include the oil pump 1 described in embodiment one, relief valve 2, selector valve 3, one-way valve 4, accumulator 5, reduction valve 6, switch valve 7, distributing valve 10 and emergent oil feeding line 01 etc., embodiment three is with the main distinction of embodiment one, embodiment three adopts hydraulic system of pump to meet an urgent need fuel feeding to distributing valve hydraulic system, this hydraulic system of pump comprises oil pump 9, one-way valve 8 and pumping valve 12 etc., and embodiment four and the main distinction of embodiment one are, embodiment four adopts and stirs hydraulic system and to meet an urgent need fuel feeding to distributing valve hydraulic system, this stirring hydraulic system comprises oil pump 9, one-way valve 8 and stirring valve 13 etc., that is: in embodiment three (four), valve 13 is stirred by one-way valve 8 to pumping valve 12(by oil pump 9) carry out fuel feeding, when the oil pump 1 of distributing valve hydraulic system, relief valve 2 or selector valve 3 break down and cause distributing valve 10 for want of pressure oil and commutation cannot be swung time, pumping valve 12(can be stirred valve 13) pressure oil on in-line by emergent oil feeding line 01 to distributing valve 10 Contingency supply, to ensure the normal work of distributing valve.Working principle and the corresponding technique effect of embodiment three and embodiment four see described in embodiment one, hereby can not repeat.
It should be noted that, the switch valve 7 in embodiment three and embodiment four is normal close two-position two-way solenoid, can certainly adopt manually operated valve as required.
It should be noted that, in embodiment one, in embodiment three and embodiment four, a set of control system can also be configured, this control system at least comprises pressure transducer, processing unit and drive circuit, wherein, pressure transducer is arranged on the in-line of distributing valve 10, for detecting the oil pressure value of this in-line in real time, processing unit is used for the oil pressure value of pressure transducer acquisition and predefined value to compare, determine whether to be less than predefined value, and when determining to be less than predefined value, the action of instruction drive circuit, drive circuit is powered to switch valve 7 after receiving instruction, make it be in electricity condition, so just can realize when distributing valve hydraulic system is for shortage of oil, pass through jib hydraulic system, the in-line of hydraulic system of pump or stirring hydraulic system makes Contingency supply to distributing valve hydraulic system, in specific implementation process, processing unit can adopt PLC or nonshared control unit to build, and drive circuit can adopt the realization such as relay or Special circuit board.
It should be noted that, in above-mentioned various embodiment, emergent oil feeding line 01 is arranged at the in-line of distributing valve hydraulic system and jib hydraulic system, hydraulic system of pump or stirs between the in-line of hydraulic system, in other embodiments, if jib hydraulic system, hydraulic system of pump or stir hydraulic system there is suitable pressure oil delivery outlet, emergent oil feeding line 01 also can be arranged between this pressure oil delivery outlet and distributing valve hydraulic system; In addition, in above-mentioned various embodiment, switch valve 7 and reduction valve 6 are arranged on emergent oil feeding line 01, be convenient to realize the emergent control for oil condition, and meet the needs of being down to target oil pressure, in other embodiments, be not limited thereto, also can adopt other modes that can realize above-mentioned corresponding function as required.
It should be noted that, in above-mentioned various embodiment, be illustrated to be applied to concrete mixer, in other embodiments, also this emergency driving system can be used for other pumping machine, such as Vehicle loaded pump or drag pump etc., certainly, Vehicle loaded pump or drag pump self not have jib hydraulic system, under this situation, can adopt hydraulic system of pump or stir the source of hydraulic system as emergency pressure oil.
The embodiment of the present invention additionally provides a kind of pumping machine, such as concrete mixer, this pumping machine is provided with above-mentioned emergency driving system, because above-mentioned emergency driving system has above-mentioned technique effect, therefore, the pumping machine being provided with emergency driving system also should possess corresponding technique effect, and the specific implementation process of its appropriate section is similar to the above embodiments, does not hereby repeat.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. an emergency driving system for pumping machine, is characterized in that:
Described emergency driving system comprises distributing valve hydraulic system, also comprises hydraulic system of pump, stirs hydraulic system or jib hydraulic system;
Described hydraulic system of pump, described stirring hydraulic system or be provided with emergent oil feeding line (01) between described jib hydraulic system and described distributing valve hydraulic system, described emergent oil feeding line (01) is for fuel feeding of meeting an urgent need to described distributing valve hydraulic system;
Described emergent oil feeding line (01) is provided with switch valve (7) and reduction valve (6), described reduction valve (6) is arranged between described switch valve (7) and described distributing valve hydraulic system;
The oiler of described emergent oil feeding line (01) is connected in the outlet line of the oil pump of described hydraulic system of pump, described stirring hydraulic system or described jib hydraulic system, the oiler of described emergent oil feeding line (01) is communicated with the outlet line of the oil pump of described hydraulic system of pump, described stirring hydraulic system or described jib hydraulic system all the time, and the oil outlet of described emergent oil feeding line (01) is connected on the in-line of described distributing valve hydraulic system;
Described emergency driving system also comprises control system, described control system at least comprises pressure transducer, processing unit and drive circuit, wherein, pressure transducer is arranged on the in-line of distributing valve hydraulic system, for detecting the oil pressure value of this in-line in real time, processing unit is used for the oil pressure value of pressure transducer acquisition and predefined value to compare, determine whether to be less than predefined value, and when determining to be less than predefined value, the action of instruction drive circuit, drive circuit is powered to switch valve (7) after receiving instruction, make it be in electricity condition, when distributing valve hydraulic system is for shortage of oil, pass through jib hydraulic system, the in-line of hydraulic system of pump or stirring hydraulic system makes Contingency supply to distributing valve hydraulic system.
2. emergency driving system as claimed in claim 1, is characterized in that: described switch valve (7) is two-position two-way solenoid valve.
3. emergency driving system as claimed in claim 1 or 2, is characterized in that: the in-line of described distributing valve hydraulic system is provided with accumulator (5).
4. a pumping machine, is characterized in that: described pumping machine is provided with the emergency driving system described in any one of claims 1 to 3.
5. pumping machine as claimed in claim 4, is characterized in that: described pumping machine is concrete mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210438697.1A CN102926539B (en) | 2012-11-06 | 2012-11-06 | Pumping machine and emergency driving system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210438697.1A CN102926539B (en) | 2012-11-06 | 2012-11-06 | Pumping machine and emergency driving system thereof |
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| CN102926539B true CN102926539B (en) | 2016-04-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104747401B (en) * | 2013-12-26 | 2018-09-21 | 河南森源重工有限公司 | A kind of emergent pumping system of manual operation device, central operation device and emergency flight control unit composition |
| CN104019076B (en) * | 2014-05-27 | 2017-04-12 | 安徽星马专用汽车有限公司 | Main oil pump reversing system of closed system pump truck and closed system pump truck |
| CN105257612B (en) * | 2015-11-26 | 2017-06-16 | 湖南五新隧道智能装备股份有限公司 | A kind of power hydraulic system and concrete spraying vehicle |
| CN107795531A (en) * | 2017-11-13 | 2018-03-13 | 邯郸钢铁集团有限责任公司 | A kind of system and its application method for keeping the secondary pressure angle stability hydraulic of chamfering slab |
| CN114688128B (en) * | 2020-12-31 | 2023-06-16 | 三一汽车制造有限公司 | Emergency pumping control package, hydraulic system and pumping equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893636A (en) * | 1994-09-21 | 1996-04-09 | Ishikawajima Constr Mach Co | Hydraulic circuit of swinging valve type concrete pump |
| CN101824915A (en) * | 2010-03-26 | 2010-09-08 | 长沙中联重工科技发展股份有限公司 | Concrete distribution device with emergency driving function of boom |
| CN102094782A (en) * | 2011-03-04 | 2011-06-15 | 徐工集团工程机械股份有限公司建设机械分公司 | Concrete pumping equipment and hydraulic system thereof |
| CN102400968A (en) * | 2011-11-18 | 2012-04-04 | 三一重工股份有限公司 | Hydraulic valve, hydraulic system and concrete pumping equipment |
| CN102734112A (en) * | 2011-04-08 | 2012-10-17 | 徐工集团工程机械股份有限公司建设机械分公司 | Concrete pumping equipment and concrete conveying hydraulic system thereof |
| CN202945809U (en) * | 2012-11-06 | 2013-05-22 | 三一重工股份有限公司 | Pumping machine and emergency driving system thereof |
-
2012
- 2012-11-06 CN CN201210438697.1A patent/CN102926539B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893636A (en) * | 1994-09-21 | 1996-04-09 | Ishikawajima Constr Mach Co | Hydraulic circuit of swinging valve type concrete pump |
| CN101824915A (en) * | 2010-03-26 | 2010-09-08 | 长沙中联重工科技发展股份有限公司 | Concrete distribution device with emergency driving function of boom |
| CN102094782A (en) * | 2011-03-04 | 2011-06-15 | 徐工集团工程机械股份有限公司建设机械分公司 | Concrete pumping equipment and hydraulic system thereof |
| CN102734112A (en) * | 2011-04-08 | 2012-10-17 | 徐工集团工程机械股份有限公司建设机械分公司 | Concrete pumping equipment and concrete conveying hydraulic system thereof |
| CN102400968A (en) * | 2011-11-18 | 2012-04-04 | 三一重工股份有限公司 | Hydraulic valve, hydraulic system and concrete pumping equipment |
| CN202945809U (en) * | 2012-11-06 | 2013-05-22 | 三一重工股份有限公司 | Pumping machine and emergency driving system thereof |
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