CN102979780B - Hydraulic cylinder and engineering machine with hydraulic cylinder - Google Patents
Hydraulic cylinder and engineering machine with hydraulic cylinder Download PDFInfo
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- CN102979780B CN102979780B CN201210478811.3A CN201210478811A CN102979780B CN 102979780 B CN102979780 B CN 102979780B CN 201210478811 A CN201210478811 A CN 201210478811A CN 102979780 B CN102979780 B CN 102979780B
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- 239000003921 oil Substances 0.000 claims abstract description 193
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims description 49
- 239000000945 filler Substances 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 abstract 4
- 230000003116 impacting effect Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 5
- 239000002828 fuel tank Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The invention discloses a hydraulic cylinder. The hydraulic cylinder comprises a cylinder barrel, a piston and a piston rod, wherein the cylinder barrel is divided into a rod cavity and a rodless cavity by the piston; the rod cavity is communicated with a first oil inlet passage; the rodless cavity is connected with a second oil inlet passage and an oil return passage; an oil supplementing oilwayfor connecting the rod cavity and the rodless cavity is arranged in the piston; a hydraulic control valve is formed in the oil supplementing oilway; the hydraulic control valve is used for controlling the closing and opening of the oil supplementing oilway, so that the hydraulic oil in the rod cavity unidirectionally flows to the rodless cavity; and a control oilway which is connected to a control oil port of the hydraulic control valve is arranged in the piston rod and the piston, so as to control the closing and opening of the hydraulic control valve. By the hydraulic cylinder, the damage of the oil supplementing oilway caused by impacting by external parts can be prevented, and the mounting of the hydraulic cylinder is not interfered with.
Description
Technical field
The present invention relates to hydraulic transmission and control technique field, in particular to a kind of hydraulic jack and have the engineering machinery of this hydraulic jack.
Background technique
In engineering machinery field, hydraulic jack is a kind of driver part commonly used, has advantages such as thrust is big, stable working is good.But because hydraulic jack is to promote piston rod movement by inject hydraulic oil in chamber, its course of action is slow relatively.Need under the QA operating mode at some, if adopt hydraulic jack as driver part, then hydraulic system need provide very large flow for hydraulic jack, at some special occasions flows even need reach 10000L/Min, but existing hydraulic system is difficult to realize the fuel feeding of so big flow, therefore makes hydraulic jack be subjected to very large restriction in the application of quick acting operating mode.
In the prior art in order to address this problem, cylinder barrel outer installment at hydraulic jack is communicated with the rod chamber of hydraulic jack and the repairing oil pipe of rodless cavity, make that formation is differential between rod chamber and rodless cavity, when the hydraulic jack quick acting, the hydraulic pressure oil subsidy of rod chamber is gone in the rodless cavity, thereby realizes stretching out fast of piston rod.But, because the repairing oil pipe is arranged in the cylinder barrel outside of hydraulic jack, in the process of hydraulic jack transportation or use, cause the repairing oil pipe to damage easily on the one hand, be not easy on the other hand hydraulic jack is installed on other devices.
Summary of the invention
In view of this, the present invention aims to provide a kind of hydraulic jack, to solve the technical problem that the repairing oil circuit damages easily in the prior art.
The invention provides a kind of hydraulic jack, comprise cylinder barrel, piston and piston rod, described piston is divided into rod chamber and rodless cavity with described cylinder barrel, described rod chamber is communicated with first oil inlet passage, described rodless cavity is connected with second oil inlet passage and drainback passage, be provided with the repairing oil circuit that connects described rod chamber and rodless cavity in the described piston, be provided with hydraulic control valve in the described repairing oil circuit, described hydraulic control valve is used for closing and opening of the described repairing oil circuit of control, make hydraulic oil in the rod chamber to the rodless cavity one-way flow, the control oil circuit that has the control port that is connected to described hydraulic control valve in described piston rod and the piston, described control oil circuit are controlled closing and opening of described hydraulic control valve.
Preferably, described hydraulic control valve is Pilot operated check valve, and the filler opening of described Pilot operated check valve is communicated with described rodless cavity, and oil outlet is communicated with described rod chamber.
Preferably, described hydraulic control valve is cartridge valve, and first hydraulic fluid port of described cartridge valve is communicated with described rodless cavity, and second hydraulic fluid port of described cartridge valve is communicated with described rod chamber.
Preferably, described first oil inlet passage comprises the oil-feed oil circuit that is arranged in the described piston rod.
Preferably, described first oil inlet passage comprises the oil-feed oil circuit that is arranged in the described piston rod, described oil-feed oil circuit is communicated with the oil outlet of described Pilot operated check valve, described second oil inlet passage is formed by connecting by described oil-feed oil circuit and described repairing oil circuit, described control oil circuit is communicated with described rodless cavity, forms described drainback passage.
Preferably, described first oil inlet passage comprises the oil-feed oil circuit that is arranged in the described piston rod, described oil-feed oil circuit is communicated with second hydraulic fluid port of described cartridge valve, offer the rodless cavity hydraulic fluid port on the casing wall of described rodless cavity, described second oil inlet passage comprises described rodless cavity hydraulic fluid port and the oil circuit that is formed by connecting by described oil-feed oil circuit and described repairing oil circuit, and described drainback passage comprises described rodless cavity hydraulic fluid port.
Preferably, described first oil inlet passage is the rod chamber hydraulic fluid port that is opened on the casing wall of described rod chamber, and described second oil inlet passage and drainback passage are the rodless cavity hydraulic fluid port on the casing wall that is opened in described rodless cavity.
At cylinder barrel outer installment repairing oil pipe, the present invention is arranged on the repairing oil circuit in the piston, can prevent that the repairing oil circuit from being collided and damaging by exterior object in the prior art, interferes nor can produce the installation of hydraulic jack.In addition, the present invention adopts the break-make of hydraulic control valve control repairing oil circuit, makes control more accurate, reliable.
The present invention also provides a kind of engineering machinery, comprise hydraulic system, described hydraulic system comprises above-mentioned each described hydraulic jack, and described hydraulic jack is connected with oil circuit in the described hydraulic system by described first oil inlet passage, second oil inlet passage and drainback passage.This project machinery obviously also has whole beneficial effects that above-mentioned hydraulic jack brings, and does not repeat them here.
Description of drawings
The accompanying drawing that constitutes a part of the present invention is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is first working state schematic representation of the hydraulic jack of first embodiment of the invention;
Fig. 2 is second working state schematic representation of the hydraulic jack of first embodiment of the invention;
Fig. 3 is first working state schematic representation of the hydraulic jack of second embodiment of the invention;
Fig. 4 is second working state schematic representation of the hydraulic jack of second embodiment of the invention;
Fig. 5 is first working state schematic representation of the hydraulic jack of third embodiment of the invention;
Fig. 6 is second working state schematic representation of the hydraulic jack of third embodiment of the invention;
Fig. 7 is first working state schematic representation of the hydraulic jack of fourth embodiment of the invention;
Fig. 8 is second working state schematic representation of the hydraulic jack of fourth embodiment of the invention.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments the present invention is further described in detail.
Set forth a lot of details in the following description so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not subjected to the restriction of following public specific embodiment.
Fig. 1 is first working state schematic representation of the hydraulic jack of first embodiment of the invention; Fig. 2 is second working state schematic representation of the hydraulic jack of first embodiment of the invention; Fig. 3 is first working state schematic representation of the hydraulic jack of second embodiment of the invention; Fig. 4 is second working state schematic representation of the hydraulic jack of second embodiment of the invention; Fig. 5 is first working state schematic representation of the hydraulic jack of third embodiment of the invention; Fig. 6 is second working state schematic representation of the hydraulic jack of third embodiment of the invention; Fig. 7 is first working state schematic representation of the hydraulic jack of fourth embodiment of the invention; Fig. 8 is second working state schematic representation of the hydraulic jack of fourth embodiment of the invention.
Please refer to Fig. 1 to Fig. 8, the hydraulic jack that the embodiment of the invention provides, comprise cylinder barrel 10, piston 20 and piston rod 30, described piston 20 is contained in the described cylinder barrel 10, be slidingly matched with described cylinder barrel 10 inwalls, described cylinder barrel 10 is divided into rod chamber 12 and rodless cavity 14, described piston rod 30 1 ends are connected on the described piston 20, and be contained in the described rod chamber 12, the other end stretches out in outside the described cylinder barrel 10, described rod chamber 12 is communicated with first oil inlet passage, described rodless cavity 14 is connected with second oil inlet passage and drainback passage, has the repairing oil circuit 21 that connects described rod chamber 12 and rodless cavity 14 in the described piston 20, be provided with hydraulic control valve 22 in the described repairing oil circuit 21, described hydraulic control valve 22 is used for closing and opening of the described repairing oil circuit 21 of control, make hydraulic oil in the rod chamber 12 to rodless cavity 14 one-way flow, the control oil circuit K that has the control port that is connected to described hydraulic control valve 22 in described piston rod 30 and the piston 20, described control oil circuit K is used for closing and opening of the described hydraulic control valve 22 of control.
By hydraulic control valve 22 is set, repairing oil circuit 21 can realize closing and opening two states.When the repairing oil circuit is opened, utilize differential principle, piston 20 two ends pressure equate, because the compression area of rodless cavity 14 piston end surfaces is greater than rod chamber 12, there is pressure reduction in the total pressure at piston 20 two ends, therefore piston 20 can be towards rod chamber 12 1 side shiftings, and the hydraulic oil in the rod chamber 12 have entered rodless cavity 14 by repairing oil circuit 21, have strengthened rodless cavity 14 flows and are conducive to piston rod 30 and stretch out fast.
Concrete, when piston rod 30 was regained, rod chamber 12 was by the first oil inlet passage oil-feed, and rodless cavity 14 is by the drainback passage oil return, and control oil circuit K control hydraulic control valve 22 is closed, and was not communicated with between rod chamber 12 and the rodless cavity 14.When piston rod 30 stretched out, rodless cavity 14 was controlled oil circuit K control hydraulic control valve 22 simultaneously and is opened by the second oil inlet passage oil-feed, and the hydraulic oil in the rod chamber 12 flows in the rodless cavity 14 by repairing oil circuit 21.Because second oil inlet passage and repairing oil circuit 21 are simultaneously to rodless cavity 14 fuel feeding, the flow that therefore enters the hydraulic oil of rodless cavity 14 increases greatly, thereby makes that piston rod 30 is shot out.
At cylinder barrel outer installment repairing oil pipe, the present invention is arranged on the repairing oil circuit in the piston, can prevent that the repairing oil circuit from being collided and damaging by exterior object in the prior art, interferes nor can produce the installation of hydraulic jack.In addition, the present invention adopts the break-make of hydraulic control valve control repairing oil circuit, makes control more accurate, reliable.
The present invention will be further described below in conjunction with drawings and Examples.
Please refer to Fig. 1 and Fig. 2, the hydraulic jack that first embodiment of the invention provides comprises cylinder barrel 10, piston 20, piston rod 30.Piston 20 is contained in the cylinder barrel 10, is slidingly matched with cylinder barrel 10 inwalls, and cylinder barrel 10 is divided into rod chamber 12 and rodless cavity 14.Piston rod 30 1 ends are connected on the piston 20, and are contained in the rod chamber 12, and the other end of piston rod 30 stretches out in outside the cylinder barrel 10, are used for connecting load.
Have repairing oil circuit 21 in the piston 20, an end of repairing oil circuit 21 is communicated with rod chamber 12, and the other end of repairing oil circuit 21 is communicated with rodless cavity 14.Be provided with hydraulic control valve 22 in the repairing oil circuit 21, be used for closing and opening of control repairing oil circuit 21, make hydraulic oil in the rod chamber 12 to rodless cavity 14 one-way flow.In the present embodiment, hydraulic control valve 22 is Pilot operated check valve, and the filler opening of Pilot operated check valve is communicated with rodless cavity 14, and oil outlet is communicated with rod chamber 12.Be provided with control oil circuit K in piston rod 30 and the piston 20, control oil circuit K is connected to the control port of hydraulic control valve 22, and when control port fed hydraulic oil, this hydraulic control valve 22 was opened, and hydraulic oil flows to oil outlet from filler opening.Control oil circuit K also is communicated with rodless cavity 14 simultaneously, as the drainback passage of rodless cavity 14.Also be provided with oil-feed oil circuit P in the piston rod 30, oil-feed oil circuit P is communicated with oil outlet and the rod chamber 12 of hydraulic control valve 22 by repairing oil circuit 21.In other embodiments, the oil-feed oil circuit P in the piston rod 30 can directly be communicated with rod chamber 12, and need not through repairing oil circuit 21, for example, can offer the hydraulic fluid port that is communicated with oil-feed oil circuit P and rod chamber 12 at the side surface of piston rod 30.
Be appreciated that in this first embodiment, first oil inlet passage that is communicated with rod chamber 12 comprises oil-feed oil circuit P, second oil inlet passage that is communicated with rodless cavity 14 is formed by connecting by oil-feed oil circuit P and repairing oil circuit 21.
Please refer to Fig. 1, when piston rod 30 is regained, during arrow direction motion that to be piston rod 30 in Fig. 1 big, control oil circuit K connects the fuel tank (not shown), hydraulic control valve 22 pressure releases in the piston 20 are closed, the repairing oil circuit is closed, and high pressure oil enters into rod chamber 12 by oil-feed oil circuit P, and the hydraulic oil in the rodless cavity 14 flows back to fuel tank by control oil circuit K.Please refer to Fig. 2, when piston rod 30 stretches out, during arrow direction motion that to be piston rod 30 in Fig. 2 big, control oil circuit K connects high pressure oil, hydraulic control valve 22 in the piston 20 is opened, rod chamber 12 and rodless cavity 14 are communicated with by repairing oil circuit 21, at this moment, rodless cavity 14 oil-feeds are divided into two parts, first portion's warp is by oil-feed oil circuit P and 21 oil-feeds of repairing oil circuit, hydraulic oil in the second portion rod chamber 12 enters in the rodless cavity 14 through hydraulic control valve 22, has increased the flow of the hydraulic oil that enters rodless cavity 14 greatly, thereby makes that piston rod 30 is shot out.In addition, as preferred implementation, control oil circuit K also can further accelerate the speed that piston rod 30 stretches out to rodless cavity 14 fuel feeding.
The hydraulic jack of present embodiment can be avoided arranging hydraulic pipe line at cylinder barrel by first oil inlet passage, second oil inlet passage and drainback passage all are arranged in piston and the piston rod, is convenient to more hydraulic jack is connected with other devices.Especially when cylinder barrel is connected with movable part, because do not arrange hydraulic pipe line on the cylinder barrel, therefore can avoid hydraulic pipe line because of the frequent flexible faults such as inefficacy or coiling that take place, improve the reliability of hydraulic jack greatly.
Fig. 3 and Fig. 4 show the hydraulic jack that second embodiment of the invention provides, the difference of itself and first embodiment's hydraulic jack is, first oil inlet passage that is communicated with rod chamber 12 is the rod chamber hydraulic fluid port Y that is opened on the casing wall of rod chamber 12, and second oil inlet passage that is communicated with rodless cavity 14 and drainback passage are the rodless cavity hydraulic fluid port W on the casing wall that is opened in rodless cavity 14.Rod chamber hydraulic fluid port Y and rodless cavity hydraulic fluid port W are all for inserting the hydraulic system (not shown) by hydraulic pipe line.
Please refer to Fig. 3, when piston rod 30 was regained, control oil circuit K control hydraulic control valve 22 was closed, and the repairing oil circuit is closed, and high pressure oil enters into rod chamber 12 by rod chamber hydraulic fluid port Y, and the hydraulic oil in the rodless cavity 14 flows back to fuel tank 50 by rodless cavity hydraulic fluid port W.Please refer to Fig. 4, when piston rod 30 stretches out, control oil circuit K connects high pressure oil, hydraulic control valve 22 in the piston 20 is opened, rod chamber 12 and rodless cavity 14 are communicated with by repairing oil circuit 21, simultaneously, hydraulic system is turn-offed the oil circuit that is connected with rod chamber hydraulic fluid port Y, at this moment, the oil-feed of rodless cavity 14 is divided into two parts, and first portion is by rodless cavity hydraulic fluid port W oil-feed, and the hydraulic oil in the second portion rod chamber 12 enters in the rodless cavity 14 by repairing oil circuit 21, increased the flow of the hydraulic oil that enters rodless cavity 14 greatly, thereby made that piston rod 30 is shot out.
The advantage of the hydraulic jack of present embodiment is, offers rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port at cylinder barrel, and manufacturing process is simple, and is less to the intensity effect of piston rod.And because the control oil circuit is not simultaneously as the oil return circuit of rodless cavity, so hydraulic system need not to design complicated hydraulic circuit for this reason, is conducive to reduce cost.
Please refer to Fig. 5 and Fig. 6, the hydraulic jack that third embodiment of the invention provides comprises cylinder barrel 10, piston 20, piston rod 30.Piston 20 is contained in the cylinder barrel 10, is slidingly matched with cylinder barrel 10 inwalls, and cylinder barrel 10 is divided into rod chamber 12 and rodless cavity 14.Piston rod 30 1 ends are connected on the piston 20, and are contained in the rod chamber 12, and the other end of piston rod 30 stretches out in outside the cylinder barrel 10, are used for connecting load.
Have repairing oil circuit 21 in the piston 20, an end of repairing oil circuit 21 is communicated with rod chamber 12, and the other end of repairing oil circuit 21 is communicated with rodless cavity 14.Be provided with hydraulic control valve 22 in the repairing oil circuit 21, be used for closing and opening of control repairing oil circuit 21, make hydraulic oil in the rod chamber 12 to rodless cavity 14 one-way flow.In the present embodiment, hydraulic control valve 22 is cartridge valve, and first hydraulic fluid port of cartridge valve is communicated with rodless cavity 14, and second hydraulic fluid port is communicated with rod chamber 12.Be provided with control oil circuit K in piston rod 30 and the piston 20, it also is cartridge valve that control oil circuit K is connected to hydraulic control valve 22() control port.Also offer oil-feed oil circuit P in the piston rod 30, oil-feed oil circuit P is communicated with second hydraulic fluid port and the rod chamber 12 of hydraulic control valve 22 by repairing oil circuit 21.In other embodiments, the oil-feed oil circuit P in the piston rod 30 can directly be communicated with rod chamber 12, and need not through repairing oil circuit 21, for example, can offer the hydraulic fluid port that is communicated with oil-feed oil circuit P and rod chamber 12 at the side surface of piston rod 30.Offer the rodless cavity hydraulic fluid port W that is communicated with rodless cavity 14 on the casing wall of rodless cavity 14.
Be appreciated that in this embodiment first oil inlet passage comprises oil-feed oil circuit P, second oil inlet passage and drainback passage are rodless cavity hydraulic fluid port W.
Please refer to Fig. 5, when piston rod 30 was regained, control oil circuit K connected high pressure oil, and control hydraulic control valve 22 is closed, and the repairing oil circuit is closed, and high pressure oil enters into rod chamber 12 by oil-feed oil circuit P, and the hydraulic oil in the rodless cavity 14 flows back to fuel tank 50 by rodless cavity hydraulic fluid port W.Please refer to Fig. 6, when piston rod 30 stretches out, control oil circuit K control hydraulic control valve 22 is opened, rod chamber 12 and rodless cavity 14 are communicated with by repairing oil circuit 21, at this moment, rodless cavity 14 oil-feeds are divided into three parts, first portion is through rodless cavity 14 hydraulic fluid port W oil-feeds, second portion enters in the rodless cavity 14 by oil-feed oil circuit P and hydraulic control valve 22, hydraulic oil in the third part rod chamber 12 enters in the rodless cavity 14 by repairing oil circuit 21, increased the flow of the hydraulic oil that enters rodless cavity 14 greatly, thereby made that piston rod 30 is shot out.
The advantage of the hydraulic jack of present embodiment is, adopts cartridge valve to control the break-make of repairing oil circuit, and the repairing of the big flow of easier realization improves the speed that piston rod stretches out.And because the control oil circuit is not simultaneously as the oil return circuit of rodless cavity, so hydraulic system need not to design complicated hydraulic circuit for this reason, is conducive to reduce cost.
Fig. 7 and Fig. 8 show the hydraulic jack that fourth embodiment of the invention provides, the difference of itself and second embodiment's hydraulic jack is that hydraulic control valve 22 is cartridge valve, and first hydraulic fluid port of cartridge valve is communicated with rodless cavity 14, second hydraulic fluid port is communicated with rod chamber 14, and control port is communicated with control oil circuit K.
Please refer to Fig. 7, when piston rod 30 was regained, control oil circuit K connected high pressure oil, control hydraulic control valve 22 is closed, repairing oil circuit 21 is closed, and high pressure oil enters into rod chamber 12 by rod chamber hydraulic fluid port Y, and the hydraulic oil in the rodless cavity 14 flows back to fuel tank 50 by rodless cavity hydraulic fluid port W.Please refer to Fig. 8, when piston rod 30 stretched out, control oil circuit K control hydraulic control valve 22 was opened, and rod chamber 12 and rodless cavity 14 are communicated with by repairing oil circuit 21, and simultaneously, hydraulic system is turn-offed the oil circuit that is connected with rod chamber hydraulic fluid port Y.At this moment, the oil-feed of rodless cavity 14 is divided into two parts, first portion is by rodless cavity hydraulic fluid port W oil-feed, hydraulic oil in the second portion rod chamber 12 enters in the rodless cavity 14 by repairing oil circuit 21, increased the flow of the hydraulic oil that enters rodless cavity 14 greatly, thereby made that piston rod 30 is shot out.
The advantage of the hydraulic jack of present embodiment is, adopts cartridge valve to control the break-make of repairing oil circuit, and the repairing of the big flow of easier realization improves the speed that piston rod stretches out.And, offer rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port at cylinder barrel, manufacturing process is simple, and is less to the intensity effect of piston rod.In addition, because the control oil circuit is not simultaneously as the oil return circuit of rodless cavity, so hydraulic system need not to design complicated hydraulic circuit for this reason, is conducive to reduce cost.
Need to prove, the present invention's alleged " hydraulic control valve 22 is used for closing and opening of the described repairing oil circuit 21 of control; make that hydraulic oil in the rod chamber 12 is to rodless cavity 14 one-way flow ", be not only to refer to hydraulic control valve 22 itself, comprise that hydraulic control valve 22 matches hydraulic oil in the realization rod chamber 12 to rodless cavity 14 one-way flow with other elements, oil circuit yet.Be example with the 3rd embodiment, because hydraulic control valve 22 is cartridge valve, therefore, when hydraulic control valve 22 is opened, although in theory, hydraulic oil both can flow to second hydraulic fluid port from first hydraulic fluid port of cartridge valve, also can flow to first hydraulic fluid port from second hydraulic fluid port, but by the pressure dependence of coupling oil-feed oil circuit P and rodless cavity hydraulic fluid port W, can realize that hydraulic oil in the rod chamber 12 is to rodless cavity 14 one-way flow.As for the pressure dependence that how to mate oil-feed oil circuit P and rodless cavity hydraulic fluid port W, this is known to those skilled in the art, does not repeat them here.
Need to prove that the embodiment of the invention is that example is set forth spirit of the present invention with single piston double-act-ing hydraulic J-Horner, but the present invention is not limited to this.It will be understood by those skilled in the art that the present invention is applicable to that also the two rod hydraulic jacks of double-piston and other have the hydraulic jack of rod chamber and rodless cavity, all should be included within the protection domain of claim of the present invention.
The present invention also provides a kind of engineering machinery, it comprises hydraulic system, described hydraulic system comprises the described hydraulic jack of above-mentioned any embodiment, and described hydraulic jack is connected with oil circuit in the described hydraulic system by described first oil inlet passage, second oil inlet passage and drainback passage.This project machinery obviously also has whole beneficial effects that above-mentioned hydraulic jack brings, and does not repeat them here.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. hydraulic jack, comprise cylinder barrel (10), piston (20) and piston rod (30), described piston (20) is divided into rod chamber (12) and rodless cavity (14) with described cylinder barrel (10), described rod chamber (12) is communicated with first oil inlet passage, described rodless cavity (14) is connected with second oil inlet passage and drainback passage, it is characterized in that, be provided with the repairing oil circuit (21) that connects described rod chamber (12) and rodless cavity (14) in the described piston (20), be provided with hydraulic control valve (22) in the described repairing oil circuit (21), described hydraulic control valve (22) is used for closing and opening of control described repairing oil circuit (21), make that the hydraulic oil in the rod chamber (12) can be to rodless cavity (14) one-way flow, be provided with the control oil circuit (K) of the control port that is connected to described hydraulic control valve (22) in described piston rod (30) and the piston (20), described control oil circuit (K) is controlled closing and opening of described hydraulic control valve (22).
2. hydraulic jack according to claim 1 is characterized in that, described hydraulic control valve (22) is Pilot operated check valve, and the filler opening of described Pilot operated check valve is communicated with described rodless cavity (14), and oil outlet is communicated with described rod chamber (12).
3. hydraulic jack according to claim 1 is characterized in that, described hydraulic control valve (22) is cartridge valve, and first hydraulic fluid port of described cartridge valve is communicated with described rodless cavity (14), and second hydraulic fluid port of described cartridge valve is communicated with described rod chamber (12).
4. according to claim 2 or 3 described hydraulic jacks, it is characterized in that described first oil inlet passage comprises the oil-feed oil circuit (P) that is arranged in the described piston rod (30).
5. hydraulic jack according to claim 2, it is characterized in that, described first oil inlet passage comprises the oil-feed oil circuit (P) that is arranged in the described piston rod (30), described oil-feed oil circuit (P) is communicated with the oil outlet of described Pilot operated check valve, described second oil inlet passage is formed by connecting by described oil-feed oil circuit (P) and described repairing oil circuit (21), described control oil circuit (K) is communicated with described rodless cavity (14), forms described drainback passage.
6. hydraulic jack according to claim 3, it is characterized in that, described first oil inlet passage comprises the oil-feed oil circuit (P) that is arranged in the described piston rod (30), described oil-feed oil circuit (P) is communicated with second hydraulic fluid port of described cartridge valve, offer rodless cavity hydraulic fluid port (W) on the casing wall of described rodless cavity (12), described second oil inlet passage comprises described rodless cavity hydraulic fluid port (W) and the oil circuit that is formed by connecting by described oil-feed oil circuit (P) and described repairing oil circuit (21), and described drainback passage comprises described rodless cavity hydraulic fluid port (W).
7. according to each described hydraulic jack of claim 1 to 3, it is characterized in that, described first oil inlet passage is the rod chamber hydraulic fluid port (Y) on the casing wall that is opened in described rod chamber (12), and described second oil inlet passage and drainback passage are the rodless cavity hydraulic fluid port (W) on the casing wall that is opened in described rodless cavity (14).
8. engineering machinery, comprise hydraulic system, it is characterized in that: described hydraulic system comprises each described hydraulic jack as claim 1-7, and described hydraulic jack is connected with oil circuit in the described hydraulic system by described first oil inlet passage, second oil inlet passage and drainback passage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210478811.3A CN102979780B (en) | 2012-11-22 | 2012-11-22 | Hydraulic cylinder and engineering machine with hydraulic cylinder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210478811.3A CN102979780B (en) | 2012-11-22 | 2012-11-22 | Hydraulic cylinder and engineering machine with hydraulic cylinder |
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| CN102979780A CN102979780A (en) | 2013-03-20 |
| CN102979780B true CN102979780B (en) | 2013-09-25 |
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| CN105757042A (en) * | 2016-04-29 | 2016-07-13 | 合肥长源液压股份有限公司 | Anticorrosion single-action hydraulic cylinder |
| CN107355439B (en) * | 2017-08-08 | 2023-05-16 | 华南理工大学 | Integrated internal expansion type mechanical locking hydraulic support leg and operation method thereof |
| CN110285110A (en) * | 2019-02-14 | 2019-09-27 | 中煤张家口煤矿机械有限责任公司 | A kind of composite hydraulic cylinder that wireless automatic control is flexible |
| CN110307192B (en) * | 2019-07-31 | 2024-06-07 | 娄底市中兴液压件有限公司 | Pressurized oil cylinder |
| CN113864269B (en) * | 2021-09-22 | 2023-09-08 | 中车太原机车车辆有限公司 | Hydraulic system oil circuit conversion device |
| CN115727033B (en) * | 2022-11-29 | 2023-11-14 | 苏州艾维科斯园林设备有限公司 | Bidirectional rapid energy-saving efficient hydraulic cylinder and application method thereof |
| CN116175717B (en) * | 2022-11-29 | 2023-11-14 | 苏州艾维科斯园林设备有限公司 | Bidirectional rapid energy-saving efficient hydraulic log splitter |
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| CN202946477U (en) * | 2012-11-22 | 2013-05-22 | 三一重工股份有限公司 | Hydraulic oil cylinder and engineering machinery with the same |
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2012
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| DE10108257A1 (en) * | 2001-02-21 | 2002-09-12 | Uwe Hecker | Hydraulic cylinder for a fork lift truck has valve housing with part of oil feed formed through piston rod |
| CN201836139U (en) * | 2010-07-23 | 2011-05-18 | 三一重工股份有限公司 | Hydraulic cylinder, hydraulic buffering system, excavator and concrete pump truck |
| CN102400975A (en) * | 2011-11-24 | 2012-04-04 | 湖南特力液压有限公司 | Secondary stretching and retracting hydraulic cylinder and hydraulic equipment |
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| CN102979780A (en) | 2013-03-20 |
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Application publication date: 20130320 Assignee: Loudi Zhongxing Hydraulic Fittings Co., Ltd. Assignor: Sanyi Heavy Industry Co., Ltd. Contract record no.: 2014430000138 Denomination of invention: Hydraulic cylinder and engineering machine with hydraulic cylinder Granted publication date: 20130925 License type: Exclusive License Record date: 20140721 |
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