CN105317067A - Double-pump valve outside flow-converging system suitable for breaking hammer of excavator - Google Patents
Double-pump valve outside flow-converging system suitable for breaking hammer of excavator Download PDFInfo
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- CN105317067A CN105317067A CN201510850554.5A CN201510850554A CN105317067A CN 105317067 A CN105317067 A CN 105317067A CN 201510850554 A CN201510850554 A CN 201510850554A CN 105317067 A CN105317067 A CN 105317067A
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Abstract
The invention relates to a double-pump valve outside flow-converging system suitable for a breaking hammer of an excavator. A hydraulic system of an existing excavator is improved. An existing oil way, supplying oil to the hydraulic breaking hammer through a multi-way valve, of a second main pump is not changed, and an oil way of a first main pump is changed through two valve blocks. According to whether a breaking pilot valve supplies the oil or not, a valve element of a pressure sequence valve and a valve element of a flow-converging valve are controlled to be opened or not, and therefore a valve element of a preferential flow control valve is controlled to supply the oil to the multi-way valve or directly supply the oil to the hydraulic breaking hammer or supply the oil to the multi-way valve and the hydraulic breaking hammer simultaneously. In the working process of the hydraulic breaking hammer, the high-pressure oil can reach the hydraulic breaking hammer only through the two valve blocks outside an original valve set of the excavator. The problem that a traditional valve inside flow-converging system loses much pressure and consequently a great amount of heat is generated is solved, and meanwhile the double pumps of the excavator are fully used. The larger breaking hammer can be mounted on the excavator of the same tonnage, and the mechanical properties of the excavator are greatly improved.
Description
Technical field
The present invention relates to excavator field, particularly a kind of outer converging system of double pump valve being applicable to digging machine disintegrating hammer, can greatly improve the performance of quartering hammer.
Background technology
For the excavator of 20T ~ 50T on the market, its quartering hammer installed is all single oil pump feed, due to the limitation of single oil pump feed, thus the quartering hammer installed on board a dredger also can only be the quartering hammer that model is less, the SY365 type excavator of such as 31 heavy industrys, if by existing single oil pump feed, 165mm(drill steel diameter can only be installed additional) quartering hammer, as adopted larger quartering hammer then cisco unity malfunction under single oil pump feed; And if adopt the mode of double pump fuel feeding, then can install 175 or 180mm(drill steel diameter) quartering hammer, thus the quartering hammer of 175 or 180mm is installed additional by the method (the former reserved function of producer) at interflow in double pump valve in certain customers; But interflow function can cause hydraulic oil to need could arrive hydraulic hammer through more valve block in valve in the valve adopting producer to reserve, this process not only seriously produces large calorimetric in valve internal pressure loss, cause entire system temperature to raise because of the deficiency of existing machinery heat-sinking capability simultaneously, easily cause hypophysis inner seal ring because of high temperature failure, thus cause the inner a series of fault of hypophysis, and the series of problems such as hydraulic oil pipe premature aging, be difficult to solve.
Therefore, the excavator user used in the market, in order to reduce fault, quartering hammer compared with ting model is substantially all installed, only utilizes single oil pump feed, cause another pump in excavator to leave unused, the overall performance of excavator is not in full use, causes the great wasting of resources.
Summary of the invention
For the problems referred to above, the technical problem to be solved in the present invention is on the basis of existing excavator hydraulic system, increase the outer converging system of a kind of double pump valve, solve the problem such as the pressure loss, temperature rising that tradition causes because of converging system in valve, make the machine performance of excavator give full play to simultaneously, increase the scope of application that can fill quartering hammer.
The present invention designs and adopts following scheme for this reason:
Be applicable to the outer converging system of double pump valve of digging machine disintegrating hammer, comprise hydraulic breaking hammer and excavator hydraulic system, described excavator hydraulic system comprises hydraulic pressure main pump, broken pilot valve, and banked direction control valves; Described hydraulic pressure main pump comprises the first main pump, the second main pump and pioneer pump, and described second main pump is connected with hydraulic breaking hammer by banked direction control valves, and pioneer pump is connected with banked direction control valves by broken pilot valve;
Also comprise priority flow control valves, priority valve, adjustable throttle valve, converging valve and one way valve, described priority flow control valves is provided with oil-in, oil-out, the first bypass spool transposition oil-in and the second bypass spool transposition oil-in; The oil-in of priority flow control valves and the second bypass spool transposition oil-in are all connected with the oil-out of the first main pump, and replace oil-in and oil-out of the first bypass spool of priority flow control valves is connected with the oil-out of priority valve and banked direction control valves respectively; The oil-in of described priority valve is connected with the oil-in of one way valve and the oil-out of converging valve respectively by adjustable throttle valve, and the oil-out of one way valve is connected with hydraulic breaking hammer, and the oil-in of converging valve is connected with the oil-out of the first main pump; Described priority valve and converging valve are equipped with bypass spool transposition oil-in, and priority valve and the bypass spool of converging valve replace, oil-in is all connected with the oil-out of broken pilot valve.
Further, the pipeline that the first bypass spool of described priority flow control valves replaces between oil-in and the oil-out of priority valve is also parallel with the first overflow valve.
Further, the second overflow valve is also in series with between the drain tap of described priority valve and the oil-in of converging valve.
Advantage of the present invention is: the present invention makes improvement in the hydraulic system of existing excavator, add two valve blocks, existing second main pump is that the oil circuit of hydraulic breaking hammer fuel feeding is constant by banked direction control valves, the oil circuit of the first main pump is changed by two valve blocks, according to broken pilot valve whether oil supply, whether the spool of controlled pressure sequence valve and converging valve is opened, and then the spool controlling priority flow control valves is other actions realizing excavator to banked direction control valves fuel feeding, or give hydraulic breaking hammer DFF Direct Fuel Feed, also or banked direction control valves and hydraulic breaking hammer fuel feeding simultaneously can be given.
Adopt system of the present invention, in the hydraulic breaking hammer course of work, hydraulic oil only needs outward can arrive hydraulic breaking hammer through two valve blocks in the valve group that excavator is original, not only avoid the problem that converging system in conventional valve loses more pressure and then produces large calorimetric, take full advantage of the double pump of excavator simultaneously, the excavator of equal tonnage can install larger quartering hammer, greatly improves the mechanical performance of excavator.
Accompanying drawing explanation
Be described further with regard to the specific embodiment of the present invention below in conjunction with accompanying drawing, wherein:
Fig. 1 is systematic schematic diagram of the present invention;
Fig. 2 is the enlarged diagram of two valve blocks in the present invention;
Fig. 3 is when hydraulic breaking hammer does not work, system principle schematic diagram of the present invention;
Fig. 4 is when hydraulic breaking hammer work, and double pump full flow to hydraulic breaking hammer for oil condition time, system principle schematic diagram of the present invention;
Fig. 5 is when hydraulic breaking hammer work, and the first main pump partial discharge, when the second main pump full flow is to hydraulic breaking hammer confession oil condition, system principle schematic diagram of the present invention;
Fig. 6 be conventional excavators hydraulic system in valve Dual-pump flow-converging to the systematic schematic diagram of hydraulic breaking hammer fuel feeding.
Detailed description of the invention
With reference to a kind of outer converging system of double pump valve being applicable to digging machine disintegrating hammer shown in Fig. 1, comprise hydraulic breaking hammer 400 and excavator hydraulic system, excavator hydraulic system comprises hydraulic pressure main pump 200, broken pilot valve 500, and banked direction control valves 300; Hydraulic pressure main pump comprises the first main pump P1, the second main pump P2 and pioneer pump P3, second main pump P2 is connected with hydraulic breaking hammer 400 by the fragmentation commutation connection 301 in banked direction control valves 300, directly to hydraulic breaking hammer 400 fuel feeding, pioneer pump P3 is connected by broken pilot valve 500 and the fragmentation in banked direction control valves 300 connection 301 that commutates.
With reference to shown in Fig. 2, the present invention increases outward in the valve of existing excavator hydraulic system valve block 100 and valve block 101, valve block 100 comprises priority flow control valves 1 and the first overflow valve 2, and valve block 101 comprises priority valve 3, adjustable throttle valve 4, one way valve 5, converging valve 6 and the second overflow valve 7.
Priority flow control valves 1 is provided with oil-in a1, oil-out a2, the first bypass spool transposition oil-in b1 and the second bypass spool transposition oil-in b2; The oil-in a1 of priority flow control valves 1 is all connected with the oil-out of the first main pump P1 by the A1 mouth of valve block 101 with the second bypass spool transposition oil-in b2, first bypass spool transposition oil-in b1 of priority flow control valves 1 is connected with the oil-out c1 of priority valve 3 by the LS2 mouth of valve block 100 and the LS1 mouth of valve block 101, oil-out a2 is connected with each valve block in banked direction control valves 300 from the A3 mouth of valve block 100, realizes excavator and goes out other actions outside fragmentation.
The oil-in c2 of priority valve 3 is connected with the oil-in g1 of one way valve 5 and the oil-out f2 of converging valve 6 respectively by adjustable throttle valve 4, the oil-out g2 of one way valve 5 is connected to hydraulic breaking hammer 400, one way valve 5 can prevent the oil of the second main pump P2 from getting back to the first main pump P1, after realizing interflow, pressure will cause pressure to reduce along with interflow pressure instability, can systems stabilisation pressure, quartering hammer can be made to have larger hitting dynamics.Adjustable throttle valve 4 can regulate the pressure size at LS1 and LS2 mouth place, thus make the spool of priority flow control valves 1 be in standard-sized sheet, full cut-off or half-open state by the pressure of the first bypass spool transposition oil-in b1, thus control the uninterrupted at converging valve 2 place.
The oil-in f1 of converging valve 2 is connected with the oil-out of the first main pump P1; Priority valve 3 and converging valve 2 are respectively equipped with bypass spool transposition oil-in d1 and bypass spool transposition oil-in d2, bypass spool transposition oil-in d1 is connected with the oil-out C3 of broken pilot valve 500 respectively by the C4 mouth of valve block 101 with bypass spool transposition oil-in d2, and the oil-in C2 of broken pilot valve 500 is connected with the oil-out of pioneer pump P3 by the C1 mouth of hydraulic pressure main pump 200.
First overflow valve 2 in parallel on pipeline between first bypass spool transposition oil-in b1 and the oil-out c2 of priority valve 3 of priority flow control valves 1, makes the first main pump P1 excess traffic flow back to fuel tank, ensures that outlet pressure is stablized; To connect between the drain tap e1 of the priority valve 3 and oil-in f1 of converging valve 2 second overflow valve 7, interflow pressure can be set up equally, play the effect of protection first main pump P1.
The course of work of the present invention is as follows:
One, hydraulic breaking hammer off position:
With reference to shown in Fig. 3, wherein black thick line is now working oil path; Second main pump P2 presses original oil circuit to the valve block fuel feeding of the left one side of something of excavator banked direction control valves 300; Pioneer pump P3 does not give broken pilot valve 500 fuel feeding, cause the bypass spool of priority valve 3 and converging valve 6 transposition oil-in d1 and bypass spool transposition oil-in d2 not have pressure oil to pass through, and then the spool of priority valve 3 and converging valve 6 is not opened; The now pressure of LS1 to LS2 mouth very low (i.e. tank pressure), as long as the very low pressure of the oil of the first main pump P1 just can promote the spool transposition of priority flow control valves 1, whole oil of the first main pump P1 are made all to arrive right half of valve block to excavator banked direction control valves 300, realize other action of excavator, and hydraulic breaking hammer does not work.
Two, hydraulic breaking hammer duty, double pump full flow is to hydraulic breaking hammer fuel feeding:
With reference to shown in Fig. 4, wherein black thick line is now working oil path; Second main pump P2 presses original oil circuit to the valve block fuel feeding of the left one side of something of excavator banked direction control valves 300; Pioneer pump P3 gives broken pilot valve 500 fuel feeding, cause the bypass spool of priority valve 3 and converging valve 6 transposition oil-in d1 and bypass spool transposition oil-in d2 to have pressure oil to pass through, and then the spool of priority valve 3 and converging valve 6 is opened; Now LS1 to LS2 mouth has higher pressure, the oil of the first main pump P1 cannot promote the spool transposition of priority flow control valves 1, the oil of the first main pump P1 is without priority flow control valves 1, but along A2 to A4 mouth to converging valve 6, converging valve 6 is now opened hydraulic oil and is directly arrived hydraulic breaking hammer 400 through one way valve 5, does not need the valve block through excavator self.
Three, hydraulic breaking hammer duty, double pump full flow is to hydraulic breaking hammer fuel feeding:
With reference to shown in Fig. 5, wherein black thick line is now working oil path; Second main pump P2 presses original oil circuit to the valve block fuel feeding of the left one side of something of excavator banked direction control valves 300; Pioneer pump P3 gives broken pilot valve 500 fuel feeding, cause the bypass spool of priority valve 3 and converging valve 6 transposition oil-in d1 and bypass spool transposition oil-in d2 to have pressure oil to pass through, and then the spool of priority valve 3 and converging valve 6 is opened; By adjustable throttle valve 4 adjust flux and then adjustment LS1 and LS2 mouth place pressure size, the spool of priority flow control valves 1 is made to be in half-open position, the now oil part supply hydraulic breaking hammer 400 of the first main pump P1, part flows into the right side half valve block in excavator banked direction control valves 300, can realize other actions of excavator simultaneously.
In sum, the system designed by the present invention can flexible operating, freely switches, give full play to the double pump effect of existing excavator, excavator main pump can not be made to leave unused and cause the waste of resource between the work of excavator hydraulic breaking hammer, off position; Traditional excavator self hydraulic system that utilizes simultaneously compared as shown in Figure 6 carries out the mode (black thick line portion is the oil circuit at interflow in traditional double pump valve) at interflow in valve, in conventional valve, Dual-pump flow-converging needs through multiple valve block, hydraulic slip is large, quantity of heat production is high, machine causes high temperature because heat-sinking capability is inadequate, thus causes destroyer, pipeline, hydraulic pressure original paper earlier period damage; Then can not there is phenomenon like this in the outer converging system of double pump valve of the present invention, the valve group simultaneously newly increased can targeted design, and adopt big orifice to arrange, the pressure loss is less, and calorific value is also less; The invention solves Dual-pump flow-converging heating problem, make the mechanical performance of excavator be not fully exerted simultaneously.
The above; be only the better detailed description of the invention of the present invention, but scope is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore scope is as the criterion with the protection domain of claims.
Claims (3)
1. be applicable to the outer converging system of double pump valve of digging machine disintegrating hammer, comprise hydraulic breaking hammer and excavator hydraulic system, described excavator hydraulic system comprises hydraulic pressure main pump, broken pilot valve, and banked direction control valves; Described hydraulic pressure main pump comprises the first main pump, the second main pump and pioneer pump, and described second main pump is connected with hydraulic breaking hammer by banked direction control valves, and pioneer pump is connected with banked direction control valves by broken pilot valve; It is characterized in that:
Also comprise priority flow control valves, priority valve, adjustable throttle valve, converging valve and one way valve, described priority flow control valves is provided with oil-in, oil-out, the first bypass spool transposition oil-in and the second bypass spool transposition oil-in; The oil-in of priority flow control valves and the second bypass spool transposition oil-in are all connected with the oil-out of the first main pump, and replace oil-in and oil-out of the first bypass spool of priority flow control valves is connected with the oil-out of priority valve and banked direction control valves respectively; The oil-in of described priority valve is connected with the oil-in of one way valve and the oil-out of converging valve respectively by adjustable throttle valve, and the oil-out of one way valve is connected with hydraulic breaking hammer, and the oil-in of converging valve is connected with the oil-out of the first main pump; Described priority valve and converging valve are equipped with bypass spool transposition oil-in, and priority valve and the bypass spool of converging valve replace, oil-in is all connected with the oil-out of broken pilot valve.
2. a kind of outer converging system of double pump valve being applicable to digging machine disintegrating hammer according to claim 1, it is characterized in that, the pipeline between the first bypass spool transposition oil-in of described priority flow control valves and the oil-out of priority valve is also parallel with the first overflow valve.
3. a kind of outer converging system of double pump valve being applicable to digging machine disintegrating hammer according to claim 1, is characterized in that, be also in series with the second overflow valve between the drain tap of described priority valve and the oil-in of converging valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510850554.5A CN105317067B (en) | 2015-11-30 | 2015-11-30 | A kind of outer converging system of double pump valve suitable for digging machine disintegrating hammer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510850554.5A CN105317067B (en) | 2015-11-30 | 2015-11-30 | A kind of outer converging system of double pump valve suitable for digging machine disintegrating hammer |
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| CN105317067A true CN105317067A (en) | 2016-02-10 |
| CN105317067B CN105317067B (en) | 2018-06-19 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820829A (en) * | 2019-11-21 | 2020-02-21 | 三一重机有限公司 | Broken confluence control system and excavator |
| CN110965608A (en) * | 2019-11-25 | 2020-04-07 | 三一重机有限公司 | Generic tool confluence hydraulic system and excavator |
| CN111851618A (en) * | 2020-07-30 | 2020-10-30 | 雷沃工程机械集团有限公司 | Method and system for solving problem of slow bucket collecting speed of constant-variable flow converging system |
| CN112012268A (en) * | 2019-05-28 | 2020-12-01 | 山东临工工程机械有限公司 | Double-pump confluence hydraulic system and excavator |
| CN112177095A (en) * | 2020-11-02 | 2021-01-05 | 山东临工工程机械有限公司 | Hydraulic energy supply system and excavator |
| CN112196005A (en) * | 2020-11-03 | 2021-01-08 | 山东临工工程机械有限公司 | Excavator hydraulic system and excavator |
| CN112211250A (en) * | 2020-11-03 | 2021-01-12 | 山东临工工程机械有限公司 | Hydraulic system with valve outer confluence and excavator |
| WO2023232034A1 (en) * | 2022-05-30 | 2023-12-07 | 三一重机有限公司 | Hydraulic system and work machine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704525A (en) * | 2012-05-21 | 2012-10-03 | 徐州徐工挖掘机械有限公司 | Hydraulic loop of excavator |
| CN102134048B (en) * | 2011-02-15 | 2012-10-10 | 安徽合力股份有限公司 | Hydraulic system of hybrid power forklift |
| CN102767196B (en) * | 2012-07-31 | 2014-10-22 | 徐州徐工挖掘机械有限公司 | Control device for hydraulic oil convergence of excavator |
| CN104153406A (en) * | 2014-08-05 | 2014-11-19 | 山河智能装备股份有限公司 | Excavator with function of switching oil hydraulic circuit according to different working conditions |
| CN204491710U (en) * | 2015-03-12 | 2015-07-22 | 西安科技大学 | A kind of mini-excavator Dual-pump flow-converging hydraulic circuit |
| JP2015166533A (en) * | 2014-03-04 | 2015-09-24 | コベルコ建機株式会社 | Oil hydraulic circuit of construction machine |
| CN205259247U (en) * | 2015-11-30 | 2016-05-25 | 周驰军 | Outer confluence system of double pump valve suitable for excavator quartering hammer |
-
2015
- 2015-11-30 CN CN201510850554.5A patent/CN105317067B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134048B (en) * | 2011-02-15 | 2012-10-10 | 安徽合力股份有限公司 | Hydraulic system of hybrid power forklift |
| CN102704525A (en) * | 2012-05-21 | 2012-10-03 | 徐州徐工挖掘机械有限公司 | Hydraulic loop of excavator |
| CN102767196B (en) * | 2012-07-31 | 2014-10-22 | 徐州徐工挖掘机械有限公司 | Control device for hydraulic oil convergence of excavator |
| JP2015166533A (en) * | 2014-03-04 | 2015-09-24 | コベルコ建機株式会社 | Oil hydraulic circuit of construction machine |
| CN104153406A (en) * | 2014-08-05 | 2014-11-19 | 山河智能装备股份有限公司 | Excavator with function of switching oil hydraulic circuit according to different working conditions |
| CN204491710U (en) * | 2015-03-12 | 2015-07-22 | 西安科技大学 | A kind of mini-excavator Dual-pump flow-converging hydraulic circuit |
| CN205259247U (en) * | 2015-11-30 | 2016-05-25 | 周驰军 | Outer confluence system of double pump valve suitable for excavator quartering hammer |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112012268A (en) * | 2019-05-28 | 2020-12-01 | 山东临工工程机械有限公司 | Double-pump confluence hydraulic system and excavator |
| CN112012268B (en) * | 2019-05-28 | 2023-02-28 | 山东临工工程机械有限公司 | Double-pump confluence hydraulic system and excavator |
| CN110820829A (en) * | 2019-11-21 | 2020-02-21 | 三一重机有限公司 | Broken confluence control system and excavator |
| CN110965608A (en) * | 2019-11-25 | 2020-04-07 | 三一重机有限公司 | Generic tool confluence hydraulic system and excavator |
| CN111851618A (en) * | 2020-07-30 | 2020-10-30 | 雷沃工程机械集团有限公司 | Method and system for solving problem of slow bucket collecting speed of constant-variable flow converging system |
| CN112177095A (en) * | 2020-11-02 | 2021-01-05 | 山东临工工程机械有限公司 | Hydraulic energy supply system and excavator |
| CN112196005A (en) * | 2020-11-03 | 2021-01-08 | 山东临工工程机械有限公司 | Excavator hydraulic system and excavator |
| CN112211250A (en) * | 2020-11-03 | 2021-01-12 | 山东临工工程机械有限公司 | Hydraulic system with valve outer confluence and excavator |
| WO2023232034A1 (en) * | 2022-05-30 | 2023-12-07 | 三一重机有限公司 | Hydraulic system and work machine |
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