CN102704525A

CN102704525A - Hydraulic loop of excavator

Info

Publication number: CN102704525A
Application number: CN2012101581351A
Authority: CN
Inventors: 王渠; 秦家升; 费树辉; 刘合涛
Original assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Current assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Priority date: 2012-05-21
Filing date: 2012-05-21
Publication date: 2012-10-03
Anticipated expiration: 2032-05-21
Also published as: CN102704525B

Abstract

The invention discloses a hydraulic loop of an excavator, which comprises a reversing valve and a selector valve, wherein the reversing valve is fixed on a pressure pipeline between an excavator main valve and a knapper; the selector valve is fixed on a converging control pipeline of a bucket; an oil inlet a3 of the reversing valve is connected with a port CK1 of the main valve; an oil outlet a2 of the reversing valve is connected with an oil inlet converging port CK2 of a valve core of the bucket; a port a4 is connected with an oil inlet circuit of the knapper; a control port a1 of the reversing valve is connected with a pilot oil port PPd of the knapper; a selecting port A1 of the selector valve is connected with a pilot oil port PPc of the valve core of the bucket; a selecting port A2 is connected with the pilot oil port PPd of the knapper; and an oil outlet P is connected with an oil port XBP1 of the main valve. The converge of broken pipelines is implemented; the excessive wear of a single pump when the excavator carries out crushing work is avoided; the power of an engine is also sufficiently utilized; and the energy saving and the consumption reduction are implemented.

Description

A kind of excavator hydraulic circuit

Technical field

The present invention relates to a kind of excavator hydraulic circuit, belong to excavator hydraulic circuit technical field.

Background technology

Hydraulic crawler excavator is widely used in the excavation of bridge construction, the laying of urban duct, and the exploitation in mine, occasions such as the dismounting of waste and old building have advantages such as maneuverability, operating efficiency height.Hydraulic crawler excavator uses double pump interflow system mostly; Be interflow in swing arm, the dipper valve, scraper bowl adopts the valve extension tube attached to realize the double pump interflow, and is as shown in Figure 1; Work such as excavation, leveling are accomplished by equipment and revolution jointly, the two main pumps supply hydraulic oil of working simultaneously.But when carrying out fragmentation work, because of the inner no confluence passage of main valve, have only the second main pump work, this not only can cause the excessive wear of second main pump, life-span to reduce, and can't make full use of the power of motor, causes the waste of the energy.

Summary of the invention

To the problem that above-mentioned prior art exists, the present invention provides a kind of excavator hydraulic circuit, when excavator carries out fragmentation work, makes two main pumps work simultaneously, improves the application life of main pump.

To achieve these goals; The technical scheme that the present invention adopts is: a kind of excavator hydraulic circuit; Comprise first main pump, second main pump, pioneer pump, main valve, destroyer and scraper bowl spool; First main pump, second main pump and pioneer pump series connection connect through pressure piping respectively between first main pump, second main pump, main valve and the destroyer; Pioneer pump is connected through first rodding with the scraper bowl spool; Also comprise and be fixed on the reversal valve on the pressure piping between excavator main valve and the destroyer and be fixed on the selector valve on the control piper of scraper bowl interflow; The oil-in a3 of said reversal valve links to each other with main valve CK1 mouth; Said reversal valve oil-out a2 mouth links to each other with the oil-feed interflow CK2 mouth of scraper bowl spool; The a4 mouth links to each other with the destroyer in-line, and the control mouth a1 of said reversal valve links to each other with destroyer guide hydraulic fluid port PPd, and the selection mouth A1 of selector valve links to each other with scraper bowl spool guide hydraulic fluid port PPc; Select a mouthful A2 to link to each other with destroyer guide hydraulic fluid port PPd, oil-out P links to each other with the XBP1 hydraulic fluid port of main valve.

The invention has the beneficial effects as follows: on the existing hydraulic circuit of excavator, change; Realize easily; Through on the pipeline of the interflow of scraper bowl, increasing the interflow pipeline of destroyer and reversal valve being switched, realized the interflow of broken pipeline, the excessive wear of single pump when avoiding excavator to carry out broken work; Made full use of engine power simultaneously, realized energy-saving and cost-reducing.

Description of drawings

Fig. 1 is the hydraulic principle sketch map of prior art;

Fig. 2 is a hydraulic principle sketch map of the present invention.

Among the figure: 1, first main pump, 2, second main pump, 3, pioneer pump, 4, main valve, 5, destroyer, 6, the scraper bowl spool, 7, reversal valve, 8, first selector valve, 9, second selector valve, 10, stop valve.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described further.

As shown in Figure 2: as to the present invention includes first main pump 1, second main pump 2, pioneer pump 3, main valve 4, destroyer 5 and scraper bowl spool 6; First main pump 1, second main pump 2 and pioneer pump 3 series connection connect through pressure piping respectively between first main pump 1, second main pump 2, main valve 4 and the destroyer 5; Pioneer pump 3 is connected through first rodding with scraper bowl spool 6; Also comprise and be fixed on the reversal valve 7 on the pressure piping between excavator main valve 4 and the destroyer 5 and be fixed on second selector valve 9 on the pressure piping of scraper bowl interflow; The oil-in a3 of said reversal valve 7 links to each other with the CK1 mouth of main valve 4; Said reversal valve 7 oil-out a2 mouths link to each other with the oil-feed interflow CK2 mouth of scraper bowl spool 6; The a4 mouth links to each other with destroyer 5 in-lines, and the control mouth a1 of said reversal valve 7 links to each other with destroyer 5 guide's hydraulic fluid port PPd, and the selection mouth A1 of second selector valve 9 links to each other with scraper bowl spool 6 guide's hydraulic fluid port PPc; Select a mouthful A2 to link to each other with destroyer 5 guide's hydraulic fluid port PPd, oil-out P links to each other with the XBP1 hydraulic fluid port of main valve 4.

Among the present invention, destroyer 5 guide's hydraulic fluid port PPd one tunnel are connected with guide's foot valve, and second selector valve 9 of leading up to links to each other with the XBP1 hydraulic fluid port of main valve 4; Scraper bowl spool 6 guide's hydraulic fluid port PPa and PPb, the one tunnel is connected with guide's handle valve, and first selector valve 8 of leading up to links to each other with second selector valve 9, and then links to each other with the XBP1 hydraulic fluid port of main valve 4 through second selector valve 9.

Excavate, during smooth operation; Operation scraper bowl control crank; Reversal valve 7 control mouthful no guide's oil pressure, reversal valve 7 is under the effect of spring like the position, a left side among the figure, and the guide oil of scraper bowl spool 6 acts on the meta stop valve 10 of main valve 4 through second selector valve 9 simultaneously; Cut off main pump oil sump tank passage, the main pump hydraulic oil collaborates to scraper bowl spool 6 through reversal valve 7 oil-outs; In the time of need carrying out crushing operation, operation destroyer 5 guide's foot valves, the guide's oil pressure that leads to reversal valve 7 control mouths shifts reversal valve 7 like the right position among the figure onto; Make its switching-over, the guide oil of second selector valve 9 makes the stop valve 10 of main valve 4 change to position, a left side, and guide's oil pressure of destroyer 5 acts on the meta stop valve 10 of main valve 4 through second selector valve 9 simultaneously; Cut off main pump oil sump tank passage, the main pump hydraulic oil collaborates to destroyer 5 through reversal valve 7 oil-outs, realizes the double pump interflow of destroyer 5; Single pump excessive wear of effectively having avoided single pump work to cause; Prolonged the application life of main pump, made full use of engine power simultaneously, realized energy-saving and cost-reducing.

Claims

1. excavator hydraulic circuit; Comprise first main pump (1), second main pump (2), pioneer pump (3), main valve (4), destroyer (5) and scraper bowl spool (6); First main pump (1), second main pump (2) and pioneer pump (3) series connection connect through pressure piping respectively between first main pump (1), second main pump (2), main valve (4) and the destroyer (5); Pioneer pump (3) is connected through first rodding with guide's hydraulic fluid port of scraper bowl spool (6); It is characterized in that also comprising and be fixed on the reversal valve (7) on the pressure piping between excavator main valve (4) and the destroyer (5) and be fixed on second selector valve (9) on the pressure piping of scraper bowl interflow; The oil-in a3 of said reversal valve (7) links to each other with the CK1 mouth of main valve (4); Said reversal valve (7) oil-out a2 mouth links to each other with the oil-feed interflow CK2 mouth of scraper bowl spool (6); The a4 mouth links to each other with destroyer (5) in-line; The control mouth a1 of said reversal valve (7) links to each other with destroyer (5) guide's hydraulic fluid port PPd; The selection mouth A1 of second selector valve (9) links to each other with scraper bowl spool (6) guide's hydraulic fluid port PPc, selects a mouthful A2 to link to each other with destroyer (5) guide's hydraulic fluid port PPd, and oil-out P links to each other with the XBP1 hydraulic fluid port of main valve (4).

2. a kind of excavator hydraulic circuit according to claim 1 is characterized in that described destroyer (5) guide's hydraulic fluid port PPd one tunnel is connected with guide's foot valve, and the oil-out P of second selector valve (9) of leading up to links to each other with the XBP1 of main valve (4).

3. a kind of excavator hydraulic circuit according to claim 1; It is characterized in that described scraper bowl spool (6) guide's hydraulic fluid port PPa and PPb; One the tunnel is connected with guide's handle valve; First selector valve (8) of leading up to links to each other with second selector valve (9), and then links to each other with the XBP1 hydraulic fluid port of main valve (4) through second selector valve (9).