Summary of the invention
In view of this, the present invention proposes a kind of structure and the hydraulic crawler excavator that improve bucket rod suction, produces the problem of emptying phenomenon with the hydraulic system solving hydraulic crawler excavator.
For achieving the above object, technical scheme of the present invention is achieved in that
Improve a structure for bucket rod suction, be applied in the hydraulic system of excavator, hydraulic system comprises load sensitive pump, load-sensitive valve, equipment and leading controller; Load sensitive pump is provided for the control oil pressure of control load sensitive valve to leading controller, load sensitive pump is provided for load-sensitive valve the operating oil pressure controlling equipment, leading controller carries out control operation by the oil pressure responsive to load valve received, and carries out different action to control equipment by load-sensitive valve; It is characterized in that, the structure improving bucket rod suction comprises the empty oil circuit of anti-suction and the first one way valve;
First one way valve is arranged on the empty oil circuit of anti-suction; Load sensitive pump is used for providing anti-suction Null oil-pressure to equipment, and anti-suction Null oil-pressure enters into equipment from load sensitive pump through the first one way valve.
The above-mentioned structure improving bucket rod suction, wherein, also comprises reducing valve, and the oil pressure that reducing valve is used for responsive to load pump and provides reduces pressure, and anti-suction Null oil-pressure enters into the first one way valve after reducing valve reduces pressure.
The above-mentioned structure improving bucket rod suction, wherein, also comprise accumulator and the second one way valve, accumulator and the second one way valve are all arranged on the oil circuit between load sensitive pump and leading controller; Control oil pressure to enter into leading controller through the order of reducing valve, the second one way valve, accumulator; Accumulator is used for providing control oil pressure to leading controller.
The above-mentioned structure improving bucket rod suction, wherein, equipment is oil cylinder.
The above-mentioned structure improving bucket rod suction, wherein, leading controller is hydraulic control lever.
In addition, a kind of hydraulic crawler excavator, wherein, includes the above-mentioned structure improving bucket rod suction.
The invention has the beneficial effects as follows:
1, load sensitive pump provides anti-suction Null oil-pressure by the empty oil circuit of anti-suction to equipment, avoids the hydraulic system of hydraulic crawler excavator due to the emptying phenomenon that speed promotes or equipment carries out composition operation and causes.
2, by utilizing accumulator when load sensitive pump provides anti-suction Null oil-pressure to equipment, continuing to provide control oil pressure to leading controller, leading controller can be worked on.
3, structure is simple, easy and simple to handle.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Basic thought of the present invention is: design a kind of structure improving bucket rod suction, by arranging the empty oil circuit of anti-suction in the hydraulic system of hydraulic crawler excavator, to play the effect preventing hydraulic system from occurring emptying phenomenon.
Below in conjunction with accompanying drawing, each preferred embodiment of the present invention is described further:
Improve a structure for bucket rod suction as shown in Figure 1, be applied in the hydraulic system of excavator, hydraulic system comprises load sensitive pump 1, load-sensitive valve 2, equipment 4 and leading controller 3; Load sensitive pump 1 is provided for the control oil pressure of control load sensitive valve 2 to leading controller 3, load sensitive pump 1 is provided for load-sensitive valve 2 operating oil pressure controlling equipment 4, leading controller 3 carries out control operation by the oil pressure responsive to load valve 2 received, and carries out different action to be controlled equipment 4 by load-sensitive valve 2; It is characterized in that, the structure improving bucket rod suction comprises the empty oil circuit 5 of anti-suction and the first one way valve 6;
First one way valve 6 is arranged on the empty oil circuit 5 of anti-suction; Load sensitive pump 1 is for providing anti-suction Null oil-pressure to equipment 4, and anti-suction Null oil-pressure enters into equipment 4 from load sensitive pump 1 through the first one way valve 6.
The operating principle of technique scheme is: when emptying phenomenon does not appear in equipment 4, the anti-suction Null oil-pressure that oil pressure in equipment 4 provides higher than load sensitive pump 1, and then anti-suction Null oil-pressure does not enter in equipment 4 by the first one way valve 6, when emptying phenomenon appears in equipment 4, load sensitive pump 1 will provide anti-suction Null oil-pressure via the first one way valve 6 to equipment 4 by the empty oil circuit of anti-suction 5.
On the basis of technique scheme, further, the structure improving bucket rod suction also comprises reducing valve 9, and the oil pressure that reducing valve 9 provides for responsive to load pump 1 reduces pressure, and anti-suction Null oil-pressure enters into the first one way valve 6 after reducing valve 9 reduces pressure; The structure improving bucket rod suction also comprises accumulator 7 and the second one way valve 8, and accumulator 7 and the second one way valve 8 are all arranged on the oil circuit between load sensitive pump 1 and leading controller 3; Control oil pressure to enter into leading controller 3 through the order of reducing valve 9, second one way valve 8, accumulator 7; Accumulator 7 is for providing control oil pressure to leading controller 3; Wherein, the oil pressure provided by reducing valve 9 responsive to load pump 1 is carried out decompression and makes anti-suction Null oil-pressure and control oil pressure to damage leading controller 3 because pressure is excessive.
Concrete, when emptying phenomenon does not appear in equipment 4, anti-suction Null oil-pressure is after reducing valve 9 reduces pressure, and the pressure of anti-suction Null oil-pressure is less than the oil pressure in the large chamber 10 of equipment 4, first one way valve 6 is closure state, and anti-suction Null oil-pressure does not enter into the large chamber 10 of equipment 4; Control oil pressure after the decompression of reducing valve 9, enter into leading controller 3 through the second one way valve 8 and accumulator 7, control oil pressure simultaneously and also provide oil pressure to accumulator 7, the control oil pressure that the oil pressure of leading controller 3 is provided by load sensitive pump 1 provides;
Concrete, when there is emptying phenomenon in equipment 4, owing to there is emptying phenomenon in equipment 4, oil pressure in the oil sucting cavity of equipment 4 is almost equal to zero, anti-suction Null oil-pressure enters in the large chamber 10 of equipment 4 through the first one way valve 6, meanwhile, load sensitive pump 1 does not provide control oil pressure to leading controller 3; Oil pressure in accumulator 7 controls oil pressure to ensure the normal work of leading controller 3 by providing to leading controller 3.
On the basis of technique scheme, further, equipment 4 is oil cylinder, and equipment 4 comprises large chamber 10 and loculus 11, and anti-suction Null oil-pressure enters in the large chamber 10 of equipment 4; Leading controller 3 is hydraulic control lever; Wherein, because emptying phenomenon the most easily appears in the large chamber 10 of equipment 4, therefore, preferably, anti-suction Null oil-pressure enters in the large chamber 10 of equipment 4, and meanwhile, anti-suction Null oil-pressure also can be applied to other according to technique scheme and occur in the hydraulic unit of emptying phenomenon.
As can be seen from the various embodiments described above, advantage of the present invention is:
1, load sensitive pump provides anti-suction Null oil-pressure by the empty oil circuit of anti-suction to equipment, avoids the hydraulic system of hydraulic crawler excavator due to the emptying phenomenon that speed promotes or equipment carries out composition operation and causes.
2, by utilizing accumulator when load sensitive pump provides anti-suction Null oil-pressure to equipment, continuing to provide control oil pressure to leading controller, leading controller can be worked on.
3, structure is simple, easy and simple to handle.
The embodiment of the present invention additionally provides a kind of hydraulic crawler excavator, this hydraulic crawler excavator be provided with above-mentioned any one improve the structure of bucket rod suction, because any one structure improving bucket rod suction above-mentioned has above-mentioned technique effect, therefore, the hydraulic crawler excavator being provided with the structure of this improvement bucket rod suction also should possess corresponding technique effect, its specific implementation process 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.