CN202946477U - Hydraulic oil cylinder and engineering machinery with the same - Google Patents

Hydraulic oil cylinder and engineering machinery with the same Download PDF

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Publication number
CN202946477U
CN202946477U CN 201220624052 CN201220624052U CN202946477U CN 202946477 U CN202946477 U CN 202946477U CN 201220624052 CN201220624052 CN 201220624052 CN 201220624052 U CN201220624052 U CN 201220624052U CN 202946477 U CN202946477 U CN 202946477U
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CN
China
Prior art keywords
oil
hydraulic
rodless cavity
oil circuit
piston
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
Application number
CN 201220624052
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Chinese (zh)
Inventor
易小刚
李�东
张作良
王鹏程
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Sany Heavy Industry Co Ltd
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Sany Heavy Industry Co Ltd
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Filing date
Publication date
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Priority to CN 201220624052 priority Critical patent/CN202946477U/en
Application granted granted Critical
Publication of CN202946477U publication Critical patent/CN202946477U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a hydraulic oil cylinder which comprises a cylinder tube, a piston and a piston rod. The cylinder tube is divided into a rod cavity and a rodless cavity by the piston. The rod cavity is communicated with a first oil inlet channel, and the rodless cavity is connected with a second oil inlet channel and an oil return channel. An oil make-up line is arranged in the piston and used for connecting the rod cavity and the rodless cavity. A hydraulic control valve is arranged in the oil make-up line, and used for controlling closing and opening of the oil make-up line so that hydraulic oil in the rod cavity flows toward the rodless cavity in a one-way mode. A control oil line of a control oil port is arranged in the piston rod and the piston, used for being connected to the hydraulic control valve and controls closing and opening of the hydraulic control valve. According to the hydraulic oil cylinder, damage of the oil make-up line due to collision of an external object is avoided and installation of the hydraulic oil cylinder is not interfered.

Description

Hydraulic jack and have the engineering machinery of this hydraulic jack
Technical field
The utility model 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 the advantages such as thrust is large, stable working is good.But because hydraulic jack is to come the motion of pushing piston bar by injection liquid force feed in chamber, its course of action is relatively slow.Need under QA operating mode at some, if adopt hydraulic jack as driver part, hydraulic system need to provide very large flow for hydraulic jack, even need to reach 10000L/Min at some special occasions flows, but existing hydraulic system is difficult to realize the fuel feeding of so large flow, therefore makes hydraulic jack be subject to very large restriction in the application of quick acting operating mode.
In 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 between rod chamber and rodless cavity form differential, when the hydraulic jack quick acting, the hydraulic oil of rod chamber fills in rodless cavity, thereby realizes stretching out fast of piston rod.But the cylinder barrel that is arranged in hydraulic jack due to the repairing oil pipe is outside, easily causes the repairing Tubing failure on the one hand in the process of hydraulic jack transportation or use, is not easy on the other hand hydraulic jack is arranged on other devices.
The model utility content
In view of this, the utility model aims to provide a kind of hydraulic jack, and in prior art, the repairing oil circuit holds flimsy technical problem to solve.
the utility model 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 the first oil inlet passage, described rodless cavity is connected with the second oil inlet passage and drainback passage, be provided with the repairing oil circuit that connects described rod chamber and rodless cavity in described piston, be provided with hydraulic control valve in described repairing oil circuit, described hydraulic control valve is used for controlling closing and opening of described repairing oil circuit, make hydraulic oil in rod chamber to the rodless cavity one-way flow, has the oil circuit control of the control port that is connected to described hydraulic control valve in described piston rod and piston, described oil circuit control is 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 the first hydraulic fluid port of described cartridge valve is communicated with described rodless cavity, and the second hydraulic fluid port of described cartridge valve is communicated with described rod chamber.
Preferably, described the first oil inlet passage comprises the oil-feed oil circuit that is arranged in described piston rod.
Preferably, described the first oil inlet passage comprises the oil-feed oil circuit that is arranged in described piston rod, described oil-feed oil circuit is communicated with the oil outlet of described Pilot operated check valve, described the second oil inlet passage is formed by connecting by described oil-feed oil circuit and described repairing oil circuit, described oil circuit control is communicated with described rodless cavity, forms described drainback passage.
Preferably, described the first oil inlet passage comprises the oil-feed oil circuit that is arranged in described piston rod, described oil-feed oil circuit is communicated with the second hydraulic fluid port of described cartridge valve, offer the rodless cavity hydraulic fluid port on the casing wall of described rodless cavity, described the 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 the first oil inlet passage is the rod chamber hydraulic fluid port that is opened on the casing wall of described rod chamber, and described the 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 utility model is arranged on the repairing oil circuit in 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 utility model adopts hydraulic control valve to control the break-make of repairing oil circuit, makes control more accurate, reliable.
The utility model also provides a kind of engineering machinery, comprise hydraulic system, described hydraulic system comprises the described hydraulic jack of above-mentioned any one, and described hydraulic jack is connected with oil circuit in described hydraulic system by described the first oil inlet passage, the 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 consists of a part of the present utility model is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the first working state schematic representation of the utility model the first embodiment's hydraulic jack;
Fig. 2 is the second working state schematic representation of the utility model the first embodiment's hydraulic jack;
Fig. 3 is the first working state schematic representation of the utility model the second embodiment's hydraulic jack;
Fig. 4 is the second working state schematic representation of the utility model the second embodiment's hydraulic jack;
Fig. 5 is the first working state schematic representation of the utility model the 3rd embodiment's hydraulic jack;
Fig. 6 is the second working state schematic representation of the utility model the 3rd embodiment's hydraulic jack;
Fig. 7 is the first working state schematic representation of the utility model the 4th embodiment's hydraulic jack;
Fig. 8 is the second working state schematic representation of the utility model the 4th embodiment's hydraulic jack.
Embodiment
In order more clearly to understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.
A lot of details have been set forth in the following description so that fully understand the utility model, but, the utility model can also adopt other to be different from other modes described here and implement, and therefore, the utility model is not subjected to the restriction of following public specific embodiment.
Fig. 1 is the first working state schematic representation of the utility model the first embodiment's hydraulic jack; Fig. 2 is the second working state schematic representation of the utility model the first embodiment's hydraulic jack; Fig. 3 is the first working state schematic representation of the utility model the second embodiment's hydraulic jack; Fig. 4 is the second working state schematic representation of the utility model the second embodiment's hydraulic jack; Fig. 5 is the first working state schematic representation of the utility model the 3rd embodiment's hydraulic jack; Fig. 6 is the second working state schematic representation of the utility model the 3rd embodiment's hydraulic jack; Fig. 7 is the first working state schematic representation of the utility model the 4th embodiment's hydraulic jack; Fig. 8 is the second working state schematic representation of the utility model the 4th embodiment's hydraulic jack.
please refer to Fig. 1 to Fig. 8, the hydraulic jack that the utility model embodiment provides, comprise cylinder barrel 10, piston 20 and piston rod 30, described piston 20 is contained in described cylinder barrel 10, be slidably 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 described piston 20, and be contained in described rod chamber 12, the other end stretches out in outside described cylinder barrel 10, described rod chamber 12 is communicated with the first oil inlet passage, described rodless cavity 14 is connected with the second oil inlet passage and drainback passage, has the repairing oil circuit 21 that connects described rod chamber 12 and rodless cavity 14 in described piston 20, be provided with hydraulic control valve 22 in described repairing oil circuit 21, described hydraulic control valve 22 is used for controlling closing and opening of described repairing oil circuit 21, make hydraulic oil in rod chamber 12 to rodless cavity 14 one-way flow, the oil circuit control K that has the control port that is connected to described hydraulic control valve 22 in described piston rod 30 and piston 20, described oil circuit control K is used for controlling closing and opening of described hydraulic control valve 22.
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, due to the compression area of rodless cavity 14 piston end surfaces 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 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 oil circuit control K controls hydraulic control valve 22 and closes, and was not communicated with between rod chamber 12 and rodless cavity 14.When piston rod 30 stretched out, rodless cavity 14 was by the second oil inlet passage oil-feed, and oil circuit control K control hydraulic control valve 22 is opened simultaneously, and the hydraulic oil in rod chamber 12 flows in rodless cavities 14 by repairing oil circuit 21.Simultaneously to rodless cavity 14 fuel feeding, the flow that therefore enters the hydraulic oil of rodless cavity 14 increases greatly, thereby makes piston rod 30 be shot out due to the second oil inlet passage and repairing oil circuit 21.
At cylinder barrel outer installment repairing oil pipe, the utility model is arranged on the repairing oil circuit in 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 utility model adopts hydraulic control valve to control the break-make of repairing oil circuit, makes control more accurate, reliable.
Below in conjunction with drawings and Examples, the utility model is described further.
Please refer to Fig. 1 and Fig. 2, the hydraulic jack that the utility model the first embodiment provides comprises cylinder barrel 10, piston 20, piston rod 30.Piston 20 is contained in cylinder barrel 10, is slidably 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 piston 20, and are contained in rod chamber 12, and the other end of piston rod 30 stretches out in outside cylinder barrel 10, are used for connecting load.
Have repairing oil circuit 21 in 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 repairing oil circuit 21, be used for control closing and opening of repairing oil circuit 21, make hydraulic oil in 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 oil circuit control K in piston rod 30 and piston 20, oil circuit control K is connected to the control port of hydraulic control valve 22, and when control port passed into hydraulic oil, this hydraulic control valve 22 was opened, and hydraulic oil flows to oil outlet from filler opening.Oil circuit control 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 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 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 on the side surface of piston rod 30.
Be appreciated that in this first embodiment, the first oil inlet passage that is communicated with rod chamber 12 comprises oil-feed oil circuit P, the 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 the large arrow direction motion that is piston rod 30 in Fig. 1, oil circuit control K connects the fuel tank (not shown), hydraulic control valve 22 pressure releases in 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 rodless cavity 14 flows back to fuel tank by oil circuit control K.Please refer to Fig. 2, when piston rod 30 stretches out, during the large arrow direction motion that is piston rod 30 in Fig. 2, oil circuit control K connects high pressure oil, hydraulic control valve 22 in 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 second portion rod chamber 12 enters in rodless cavity 14 through hydraulic control valve 22, has greatly increased the flow of the hydraulic oil that enters rodless cavity 14, thereby makes piston rod 30 be shot out.In addition, as preferred implementation, oil circuit control K also can to rodless cavity 14 fuel feeding, further accelerate the speed that piston rod 30 stretches out.
The hydraulic jack of the present embodiment can avoid arranging hydraulic pipe line by the first oil inlet passage, the second oil inlet passage and drainback passage all are arranged in piston and piston rod on cylinder barrel, more be convenient to hydraulic jack is connected with other devices.Especially when cylinder barrel is connected with movable part, because do not arrange hydraulic pipe line on cylinder barrel, therefore can avoid hydraulic pipe line because of the frequent flexible faults such as inefficacy or coiling that occur, greatly improve the reliability of hydraulic jack.
Fig. 3 and Fig. 4 show the hydraulic jack that the utility model the second embodiment provides, the difference of itself and the first embodiment's hydraulic jack is, the 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 the 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 access the hydraulic system (not shown) by hydraulic pipe line.
Please refer to Fig. 3, when piston rod 30 was regained, oil circuit control K controlled hydraulic control valve 22 and closes, 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 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, oil circuit control K connects high pressure oil, hydraulic control valve 22 in 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 second portion rod chamber 12 enters in rodless cavity 14 by repairing oil circuit 21, greatly increase the flow of the hydraulic oil that enters rodless cavity 14, thereby made piston rod 30 be shot out.
The advantage of the hydraulic jack of the present embodiment is, offers rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port on cylinder barrel, and manufacturing process is simple, and is less to the intensity effect of piston rod.And because oil circuit control 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 costs.
Please refer to Fig. 5 and Fig. 6, the hydraulic jack that the utility model the 3rd embodiment provides comprises cylinder barrel 10, piston 20, piston rod 30.Piston 20 is contained in cylinder barrel 10, is slidably 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 piston 20, and are contained in rod chamber 12, and the other end of piston rod 30 stretches out in outside cylinder barrel 10, are used for connecting load.
Have repairing oil circuit 21 in 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 repairing oil circuit 21, be used for control closing and opening of repairing oil circuit 21, make hydraulic oil in rod chamber 12 to rodless cavity 14 one-way flow.In the present embodiment, hydraulic control valve 22 is cartridge valve, and the first hydraulic fluid port of cartridge valve is communicated with rodless cavity 14, and the second hydraulic fluid port is communicated with rod chamber 12.Be provided with oil circuit control K in piston rod 30 and piston 20, it is also cartridge valve that oil circuit control K is connected to hydraulic control valve 22() control port.Also offer oil-feed oil circuit P in piston rod 30, oil-feed oil circuit P is communicated with the 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 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 on 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, the first oil inlet passage comprises oil-feed oil circuit P, and the 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, oil circuit control K connected high pressure oil, controlled hydraulic control valve 22 and 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 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, oil circuit control K controls hydraulic control valve 22 and opens, 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 rodless cavity 14 by oil-feed oil circuit P and hydraulic control valve 22, hydraulic oil in third part rod chamber 12 enters in rodless cavity 14 by repairing oil circuit 21, greatly increase the flow of the hydraulic oil that enters rodless cavity 14, thereby made piston rod 30 be shot out.
The advantage of the hydraulic jack of the present embodiment is, adopts cartridge valve to control the break-make of repairing oil circuit, more easily realizes the repairing of large flow, improves the speed that piston rod stretches out.And because oil circuit control 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 costs.
Fig. 7 and Fig. 8 show the hydraulic jack that the utility model the 4th embodiment provides, the difference of itself and the second embodiment's hydraulic jack is, hydraulic control valve 22 is cartridge valve, the first hydraulic fluid port of cartridge valve is communicated with rodless cavity 14, the second hydraulic fluid port is communicated with rod chamber 14, and control port is communicated with oil circuit control K.
Please refer to Fig. 7, when piston rod 30 was regained, oil circuit control K connected high pressure oil, controlling hydraulic control valve 22 closes, 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 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, oil circuit control K controlled hydraulic control valve 22 and opens, 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 second portion rod chamber 12 enters in rodless cavity 14 by repairing oil circuit 21, greatly increase the flow of the hydraulic oil that enters rodless cavity 14, thereby made piston rod 30 be shot out.
The advantage of the hydraulic jack of the present embodiment is, adopts cartridge valve to control the break-make of repairing oil circuit, more easily realizes the repairing of large flow, improves the speed that piston rod stretches out.And, offer rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port on cylinder barrel, manufacturing process is simple, and is less to the intensity effect of piston rod.In addition, because oil circuit control 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 costs.
Need to prove, the utility model alleged " hydraulic control valve 22 is used for controlling closing and opening of described repairing oil circuit 21; make hydraulic oil in rod chamber 12 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 with other elements, oil circuit to realize that hydraulic oil in rod chamber 12 is to rodless cavity 14 one-way flow yet.Take the 3rd embodiment as example, 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 the second hydraulic fluid port from the first hydraulic fluid port of cartridge valve, also can flow to the first hydraulic fluid port from the 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 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, the utility model embodiment sets forth spirit of the present utility model as an example of single piston double-action hydraulic jack example, but the utility model is not limited in this.It will be understood by those skilled in the art that the utility model also is applicable to the two rod hydraulic jacks of double-piston and other have the hydraulic jack of rod chamber and rodless cavity, within all should being included in the protection domain of the utility model claim.
The utility model 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 described hydraulic system by described the first oil inlet passage, the 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 only preferred embodiment of the present utility model, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

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 the first oil inlet passage, described rodless cavity (14) is connected with the 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 described piston (20), be provided with hydraulic control valve (22) in described repairing oil circuit (21), described hydraulic control valve (22) is used for controlling closing and opening of described repairing oil circuit (21), make the hydraulic oil in rod chamber (12) can be to rodless cavity (14) one-way flow, be provided with the oil circuit control (K) of the control port that is connected to described hydraulic control valve (22) in described piston rod (30) and piston (20), described oil circuit control (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 the first hydraulic fluid port of described cartridge valve is communicated with described rodless cavity (14), and the 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, is characterized in that, described the first oil inlet passage comprises the oil-feed oil circuit (P) that is arranged in described piston rod (30).
5. hydraulic jack according to claim 2, it is characterized in that, described the first oil inlet passage comprises the oil-feed oil circuit (P) that is arranged in described piston rod (30), described oil-feed oil circuit (P) is communicated with the oil outlet of described Pilot operated check valve, described the second oil inlet passage is formed by connecting by described oil-feed oil circuit (P) and described repairing oil circuit (21), described oil circuit control (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 the first oil inlet passage comprises the oil-feed oil circuit (P) that is arranged in described piston rod (30), described oil-feed oil circuit (P) is communicated with the 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 the 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. the described hydraulic jack of according to claim 1 to 3 any one, it is characterized in that, described the 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 the 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 as the described hydraulic jack of claim 1-7 any one, and described hydraulic jack is connected with oil circuit in described hydraulic system by described the first oil inlet passage, the second oil inlet passage and drainback passage.
CN 201220624052 2012-11-22 2012-11-22 Hydraulic oil cylinder and engineering machinery with the same Withdrawn - After Issue CN202946477U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220624052 CN202946477U (en) 2012-11-22 2012-11-22 Hydraulic oil cylinder and engineering machinery with the same

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Application Number Priority Date Filing Date Title
CN 201220624052 CN202946477U (en) 2012-11-22 2012-11-22 Hydraulic oil cylinder and engineering machinery with the same

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Publication Number Publication Date
CN202946477U true CN202946477U (en) 2013-05-22

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CN 201220624052 Withdrawn - After Issue CN202946477U (en) 2012-11-22 2012-11-22 Hydraulic oil cylinder and engineering machinery with the same

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102979780A (en) * 2012-11-22 2013-03-20 三一重工股份有限公司 Hydraulic cylinder and engineering machine with hydraulic cylinder
CN107654542A (en) * 2017-10-11 2018-02-02 长治市潞安合力机械有限责任公司 A kind of fast discharge opeing compressing cylinder of monorail crane
CN108386415A (en) * 2018-05-30 2018-08-10 湖南三港口设备有限公司 A kind of anticollision oil cylinder and engineering machinery

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102979780A (en) * 2012-11-22 2013-03-20 三一重工股份有限公司 Hydraulic cylinder and engineering machine with hydraulic cylinder
CN107654542A (en) * 2017-10-11 2018-02-02 长治市潞安合力机械有限责任公司 A kind of fast discharge opeing compressing cylinder of monorail crane
CN108386415A (en) * 2018-05-30 2018-08-10 湖南三港口设备有限公司 A kind of anticollision oil cylinder and engineering machinery

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Granted publication date: 20130522

Effective date of abandoning: 20130925