CN203532365U - Extension and retraction control loop of vertical support leg oil cylinder and engineering machinery - Google Patents
Extension and retraction control loop of vertical support leg oil cylinder and engineering machinery Download PDFInfo
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- CN203532365U CN203532365U CN201320685569.7U CN201320685569U CN203532365U CN 203532365 U CN203532365 U CN 203532365U CN 201320685569 U CN201320685569 U CN 201320685569U CN 203532365 U CN203532365 U CN 203532365U
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- oil cylinder
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- control loop
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- 239000003921 oil Substances 0.000 claims abstract description 207
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 description 7
- 230000002457 bidirectional effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The utility model discloses an extension and retraction control loop of a vertical support leg oil cylinder. The extension and retraction control loop of the vertical support leg oil cylinder comprises a first working oil passage (1) for oil taking and returning of the rodless cavity of the vertical support leg oil cylinder, and a second working oil passage (2) for oil taking and returning of the rod cavity of the vertical support leg oil cylinder. The first working oil passage is connected with a hydraulic check valve (11), and the control port of the hydraulic check valve is connected with the second working oil passage; the second working oil passage is connected with a balance valve (21), and the control port of the balance valve (21) is connected with the rodless cavity and/or the rod cavity, so that oil pressure of hydraulic oil in the rodless cavity and/or the rod cavity can be transmitted to the control port of the balance valve. The extension and retraction control loop of the vertical support leg oil cylinder can maintain the oil pressure of the hydraulic oil inside the oil cylinder within a proper range and further prolong the service life of the oil cylinder.
Description
Technical field
The utility model relates to engineering machinery field, particularly, relates to a kind of expansion control loop and engineering machinery of vertical support oil cylinder.
Background technique
Bidirectional hydraulic lock is widely used on the expansion control loop of oil cylinder, and its effect is when pressure oil cuts off, can make oil cylinder in the situation that of bearing load by plunger lock in fixing position.
Attachedly Figure 1 shows that in prior art for the vertical support oil cylinder in engineering machinery and be arranged on the bidirectional hydraulic lock on oil cylinder.Bidirectional hydraulic lock its essence is by two Pilot operated check valves and forms.When hydraulic oil enters from A1, hydraulic oil enters oil cylinder rodless cavity through the first Pilot operated check valve 100 to B1; Simultaneously the pressure at A1 place arrives the control mouth (in figure shown in dotted line) of the second Pilot operated check valve 200, and it is oppositely opened, and the hydraulic oil of cylinder rod chamber is through B2, the second Pilot operated check valve 200 to A2 oil returns.So just realized the extend action of oil cylinder.The retract action of oil cylinder is also same principle: when hydraulic oil enters from A2, hydraulic oil enters cylinder rod chamber through the second Pilot operated check valve 200 to B2; Simultaneously the pressure at A2 place arrives the control mouth (in figure shown in dotted line) of the first Pilot operated check valve 100, and it is oppositely opened, and the hydraulic oil of oil cylinder rodless cavity is through B1, the first Pilot operated check valve 100 to A1 oil returns.
When A1, A2 enter without hydraulic oil, the first Pilot operated check valve 100 and the second Pilot operated check valve 200 all can not oppositely be opened, and oil cylinder is just lockable like this, the position when remaining on pressure oil and being cut off.
The Locking property of bidirectional hydraulic lock is very good, the almost nil leakage of leakage of fluid, and oil cylinder can be very reliably by locking.Fluid has the characteristic of expanding with heat and contract with cold, 10 ℃ of the every increases of temperature, and the volume of fluid increases approximately 0.7%.Therefore oil cylinder is in the situation that external temperature raises, and as being exposed to the sun by the sun for a long time, in situation that ambient temperature is higher, the temperature of oil cylinder inner fluid is rising excessively, after fluid expansion, can make in-oil cylinder pressure sharply increase.At this moment due to the cause of the Locking property of bidirectional hydraulic lock, oil liquid pressure cannot be discharged, therefore can cause oil cylinder for a long time in abnormal high pressure conditions, when serious, can cause oil cylinder and damage, cause security incident.
Model utility content
The purpose of this utility model is to provide a kind of expansion control loop and engineering machinery of vertical support oil cylinder, uses so that the oil pressure of the hydraulic oil in oil cylinder remains at suitable scope, and then extends the working life of oil cylinder.
To achieve these goals, the utility model provides a kind of expansion control loop of vertical support oil cylinder, comprise for the first working oil path of the oil inlet and oil return of the rodless cavity of vertical support oil cylinder with for the second working oil path of the oil inlet and oil return of the rod chamber of vertical support oil cylinder, in the first working oil path, be connected with Pilot operated check valve, the control mouth of Pilot operated check valve is connected with the second working oil path, in the second working oil path, be connected with equilibrium valve, the control mouth of this equilibrium valve is connected to rodless cavity and/or rod chamber, so that the oil pressure of the hydraulic oil in rodless cavity and/or rod chamber can be delivered to the control mouth of equilibrium valve.
Preferably, equilibrium valve comprises sequence valve and the one-way valve being connected in parallel; Wherein, the control mouth that the control mouth of equilibrium valve is sequence valve, the reverse port of one-way valve is connected to rod chamber.
Preferably, the control mouth of equilibrium valve is connected in the oil circuit part between Pilot operated check valve and rodless cavity of the first working oil path.
Preferably, the control mouth of equilibrium valve is also connected in the oil circuit part between rod chamber and equilibrium valve of the second working oil path.
Preferably, the control mouth of equilibrium valve is connected in the oil circuit part between rod chamber and equilibrium valve of the second working oil path.
Preferably, the control mouth of equilibrium valve is also connected in the first working oil path.
Preferably, expansion control loop also comprises the selector valve being connected with the second working oil path with the first working oil path, and wherein, selector valve is connected with oil return circuit with the oil-feed oil circuit of expansion control loop.
On the other hand, the utility model also provides a kind of engineering machinery, and this project machinery comprises vertical support oil cylinder, is provided with the expansion control loop of above-mentioned vertical support oil cylinder on this vertical support oil cylinder.
Preferably, engineering machinery is hoist or pump truck.
Pass through technique scheme, the utility model arranges equilibrium valve in the expansion control loop of vertical support oil cylinder, the control mouth of this equilibrium valve is connected to rodless cavity and/or the rod chamber of vertical support oil cylinder, so that the oil pressure of the hydraulic oil in rodless cavity and/or rod chamber can be delivered to the control mouth of equilibrium valve.By this, when the operating ambient temperature of vertical support oil cylinder is higher, fluid expands while making in-oil cylinder pressure rise to the unlatching oil pressure of equilibrium valve, the hydraulic oil in rodless cavity and/or rod chamber can be opened equilibrium valve, makes a small amount of fluid oil return.Like this, can make too high oil pressure discharge by equilibrium valve, to prevent that vertical support oil cylinder from, in abnormal high oil pressure state, making the oil pressure of the hydraulic oil in oil cylinder remain at suitable scope, and then the working life of prolongation oil cylinder.
Other feature and advantage of the present utility model partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the expansion control loop of the vertical support oil cylinder of prior art;
Fig. 2 is according to the schematic diagram of the expansion control loop of an embodiment's of the present utility model vertical support oil cylinder;
Fig. 3 is according to the schematic diagram of the expansion control loop of another embodiment's of the present utility model vertical support oil cylinder;
Fig. 4 is according to the schematic diagram of the expansion control loop of another embodiment's of the present utility model vertical support oil cylinder;
Fig. 5 is according to the schematic diagram of the expansion control loop of another embodiment's of the present utility model vertical support oil cylinder.
Description of reference numerals
100 first Pilot operated check valve 200 second Pilot operated check valves
1 first working oil path 11 Pilot operated check valves
2 second working oil path 21 equilibrium valve 211 sequence valves
212 one-way valves
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
Referring to figs. 2 to Fig. 5, the utility model provides a kind of expansion control loop of vertical support oil cylinder.This control loop comprises the first working oil path 1 and the second working oil path 2 that is connected to selector valve (not shown).Selector valve is connected with oil return circuit with the oil-feed oil circuit of expansion control loop, and by the control of selector valve, the first working oil path 1 and the second working oil path 2 can replace oil inlet and oil return.Wherein, the first working oil path 1 is for the oil inlet and oil return of the rodless cavity of vertical support oil cylinder, and the second working oil path 2 is for the oil inlet and oil return of the rod chamber of vertical support oil cylinder.
In more detail, according to embodiment of the present utility model, in the first working oil path 1, be connected with Pilot operated check valve 11, the control mouth of this Pilot operated check valve 11 is connected to the second working oil path 2.In the second working oil path 2, be connected with equilibrium valve 21, the control mouth of this equilibrium valve 21 is connected to rodless cavity and/or rod chamber.Particularly, as shown in Fig. 2 to Fig. 5, when hydraulic oil enters from the A1 of the first working oil path 1, hydraulic oil enters the rodless cavity of vertical support oil cylinder through Pilot operated check valve 11 to B1; The pressure at A1 place arrives the control mouth of equilibrium valve 21 simultaneously, and equilibrium valve 21 is opened, and the hydraulic oil of vertical support oil cylinder rod chamber is through B2, equilibrium valve 21 to A2 oil returns.So just realized the extend action of vertical support oil cylinder.The retract action of vertical support oil cylinder is also same principle: when hydraulic oil enters from A2, hydraulic oil enters cylinder rod chamber through equilibrium valve 21 to B2; The pressure at A2 place arrives the control mouth of Pilot operated check valve 11 simultaneously, and it is oppositely opened, and the hydraulic oil of vertical support oil cylinder rodless cavity is through B1, Pilot operated check valve 11 to A1 oil returns.When A1, A2 enter without hydraulic oil, Pilot operated check valve 11 can not oppositely be opened, and equilibrium valve 21 can not be opened, and vertical support oil cylinder is just lockable like this, the position when remaining on pressure oil and being cut off.
Further, according to embodiment of the present utility model, the oil pressure of the hydraulic oil in rodless cavity and/or rod chamber can be delivered to the control mouth of equilibrium valve 21.Like this, in the situation that vertical support oil cylinder is lockable, when the oil pressure of the hydraulic oil in rod chamber and/or rodless cavity raises and surpasses the unlatching oil pressure of equilibrium valve 21, a part of hydraulic oil of rod chamber can pass through equilibrium valve 21 oil returns, can make by this too high oil pressure discharge by equilibrium valve 21, thus in the time of can preventing that vertical support oil cylinder is operated in hot environment in abnormal high oil pressure state.
Continuation is referring to figs. 2 to Fig. 4, and according to embodiment of the present utility model, equilibrium valve 21 comprises sequence valve 211 and the one-way valve 212 being connected in parallel.Wherein, the control mouth of equilibrium valve 21 is the control mouth of sequence valve 211, and the reverse port of one-way valve 212 is connected to rod chamber.In the present embodiment, the size of the cracking pressure of sequence valve 211 can be set as, and is meeting under the prerequisite that vertical support oil cylinder falls under can be because of deadweight, reduces the cracking pressure of sequence valve 211 as far as possible.Like this, can protect to greatest extent vertical support oil cylinder to make it can be not impaired because of the abnormal condition of internal oil pressure.
The following specifically describes several embodiments of the present utility model.
With reference to figure 2, according to an embodiment of the present utility model, the control mouth of equilibrium valve 21 (being also the control mouth of sequence valve 211 in the present embodiment) is connected in the oil circuit part between Pilot operated check valve 11 and rodless cavity of the first working oil path 1.When hydraulic oil enters from the A1 of the first working oil path 1, hydraulic oil enters the rodless cavity of vertical support oil cylinder through Pilot operated check valve 11 to B1; Simultaneously, because Pilot operated check valve 11 is all opened, therefore the pressure at A1 place also can be delivered to the control mouth of equilibrium valve 21 from the opposite side of Pilot operated check valve 11, equilibrium valve 21 is opened, thereby the hydraulic oil of vertical support oil cylinder rod chamber is through B2, equilibrium valve 21 to A2 oil returns.So just realized the extend action of vertical support oil cylinder.The retract action of vertical support oil cylinder, with as described above identical, repeats no more herein.When A1, A2 enter without hydraulic oil, position when vertical support oil cylinder remains on pressure oil and is cut off.Accordingly, when the internal oil pressure of vertical support oil cylinder is elevated to the unlatching oil pressure of equilibrium valve 21, a part of hydraulic oil of rod chamber can pass through equilibrium valve 21 oil returns, thereby can make too high oil pressure discharge by equilibrium valve 21.
Further, with reference to figure 3, according to another embodiment of the present utility model, the control mouth of equilibrium valve 21 (being also the control mouth of sequence valve 211 in the present embodiment) is not only connected in the oil circuit part between Pilot operated check valve 11 and rodless cavity of the first working oil path 1, is also connected in the oil circuit part between rod chamber and equilibrium valve 21 of the second working oil path 2.Accordingly, when the internal oil pressure of vertical support oil cylinder is elevated to the unlatching oil pressure of equilibrium valve 21, a part of hydraulic oil in rod chamber can pass through equilibrium valve 21 oil returns, thereby can make too high oil pressure discharge by equilibrium valve 21.
With reference to figure 4, according to another embodiment of the present utility model, the control mouth of equilibrium valve 21 (being also the control mouth of sequence valve 211 in the present embodiment) is connected in the oil circuit part between rod chamber and equilibrium valve 21 of the second working oil path 2.The extend action of vertical support oil cylinder and the principle of retract action, with as described above identical, repeat no more herein.Accordingly, when the internal oil pressure of vertical support oil cylinder is elevated to the unlatching oil pressure of equilibrium valve 21, a part of hydraulic oil in rod chamber can pass through equilibrium valve 21 oil returns, thereby can make too high oil pressure discharge by equilibrium valve 21.
Further, with reference to figure 5, according to another embodiment of the present utility model, the control mouth of equilibrium valve 21 (being also the control mouth of sequence valve 211 in the present embodiment) is also connected in the first working oil path 1.The extend action of vertical support oil cylinder and the principle of retract action, with as described above identical, repeat no more herein.Accordingly, when the internal oil pressure of vertical support oil cylinder is elevated to the unlatching oil pressure of equilibrium valve 21, a part of hydraulic oil in rod chamber can pass through equilibrium valve 21 oil returns, thereby can make too high oil pressure discharge by equilibrium valve 21.
On the other hand, the utility model also provides a kind of engineering machinery, and this project machinery comprises vertical support oil cylinder.Wherein, on vertical support oil cylinder, be provided with the expansion control loop of above-mentioned vertical support oil cylinder, in order to oil pressure too high in vertical support oil cylinder is discharged by equilibrium valve 21.
In addition, according to embodiment of the present utility model, engineering machinery can be hoist or pump truck.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, between various mode of execution of the present utility model, also can carry out combination in any, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (9)
1. the expansion control loop of a vertical support oil cylinder, comprise for first working oil path (1) of the oil inlet and oil return of the rodless cavity of described vertical support oil cylinder with for second working oil path (2) of the oil inlet and oil return of the rod chamber of described vertical support oil cylinder, in described the first working oil path (1), be connected with Pilot operated check valve (11), the control mouth of described Pilot operated check valve (11) is connected with described the second working oil path (2), it is characterized in that, in described the second working oil path (2), be connected with equilibrium valve (21), the control mouth of this equilibrium valve (21) is connected to described rodless cavity and/or described rod chamber, so that the oil pressure of the hydraulic oil in described rodless cavity and/or described rod chamber can be delivered to the control mouth of described equilibrium valve (21).
2. the expansion control loop of vertical support oil cylinder according to claim 1, is characterized in that, described equilibrium valve (21) comprises sequence valve (211) and the one-way valve (212) being connected in parallel;
Wherein, the control mouth of described equilibrium valve (21) is the control mouth of described sequence valve (211), and the reverse port of described one-way valve (212) is connected to described rod chamber.
3. the expansion control loop of vertical support oil cylinder according to claim 1, it is characterized in that, the control mouth of described equilibrium valve (21) is connected in the oil circuit part between described Pilot operated check valve (11) and described rodless cavity that is positioned at of described the first working oil path (1).
4. the expansion control loop of vertical support oil cylinder according to claim 3, it is characterized in that, the control mouth of described equilibrium valve (21) is also connected in the oil circuit part between described rod chamber and described equilibrium valve (21) that is positioned at of described the second working oil path (2).
5. the expansion control loop of vertical support oil cylinder according to claim 1, it is characterized in that, the control mouth of described equilibrium valve (21) is connected in the oil circuit part between described rod chamber and described equilibrium valve (21) that is positioned at of described the second working oil path (2).
6. the expansion control loop of vertical support oil cylinder according to claim 5, is characterized in that, the control mouth of described equilibrium valve (21) is also connected in described the first working oil path (1).
7. according to the expansion control loop of the vertical support oil cylinder described in any one in claim 1-6, it is characterized in that, described expansion control loop also comprises the selector valve being connected with described the second working oil path (2) with described the first working oil path (1), wherein, described selector valve is connected with oil return circuit with the oil-feed oil circuit of described expansion control loop.
8. an engineering machinery, comprises vertical support oil cylinder, it is characterized in that, is provided with the expansion control loop of the vertical support oil cylinder described in any one in claim 1-7 on described vertical support oil cylinder.
9. engineering machinery according to claim 8, is characterized in that, described engineering machinery is hoist, pump truck or fire-fighting truck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320685569.7U CN203532365U (en) | 2013-11-01 | 2013-11-01 | Extension and retraction control loop of vertical support leg oil cylinder and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320685569.7U CN203532365U (en) | 2013-11-01 | 2013-11-01 | Extension and retraction control loop of vertical support leg oil cylinder and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN203532365U true CN203532365U (en) | 2014-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320685569.7U Expired - Lifetime CN203532365U (en) | 2013-11-01 | 2013-11-01 | Extension and retraction control loop of vertical support leg oil cylinder and engineering machinery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396390A (en) * | 2020-04-29 | 2020-07-10 | 徐州徐工随车起重机有限公司 | Balance valve group suitable for stability control of overhead working truck |
-
2013
- 2013-11-01 CN CN201320685569.7U patent/CN203532365U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396390A (en) * | 2020-04-29 | 2020-07-10 | 徐州徐工随车起重机有限公司 | Balance valve group suitable for stability control of overhead working truck |
| CN111396390B (en) * | 2020-04-29 | 2021-05-18 | 徐州徐工随车起重机有限公司 | Balance valve group suitable for stability control of overhead working truck |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province Patentee after: Hunan Zoomlion emergency equipment Co.,Ltd. Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Address before: No.997 Jinxing Road, Wangcheng District, Changsha City, Hunan Province Patentee before: Changsha Zhonglian Fire-Fighting Machinery Co.,Ltd. Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |