CN203430888U - Wheeled crane and hydraulic balance loop thereof - Google Patents
Wheeled crane and hydraulic balance loop thereof Download PDFInfo
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- CN203430888U CN203430888U CN201320488357.XU CN201320488357U CN203430888U CN 203430888 U CN203430888 U CN 203430888U CN 201320488357 U CN201320488357 U CN 201320488357U CN 203430888 U CN203430888 U CN 203430888U
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Abstract
The utility model discloses a wheeled crane and a hydraulic balance loop thereof. The hydraulic balance loop comprises a hydraulic cylinder and a balance valve, wherein the axis of the hydraulic cylinder and the horizontal direction form an included angle, the hydraulic cylinder is communicated with a system oil path, and the balance valve is arranged on the system oil path communicated with a working cavity under the hydraulic cylinder; a balance control oil port of the balance valve is communicated with one of two working oil ports of the balance valve; the hydraulic balance loop further comprises a first direction control valve arranged between the balance control oil port and a hydraulic oil tank and used for controlling the connection/disconnection of the balance control oil port and the hydraulic oil tank. When the balance control oil path is communicated with the hydraulic oil tank, the hydraulic cylinder is at a working state; when the balance control oil path is disconnected with the hydraulic oil tank, the hydraulic cylinder is switched to a non-working state. Compared with the prior art, the hydraulic balance loop has the advantages that due to the adoption of the internally-controlled balance valve, continuous and stable pressure oil is provided for the balance control oil port in the descending process of the hydraulic cylinder, so that the hydraulic cylinder stably descends. As the first direction control valve is arranged, the hydraulic cylinder is switched to a locking state.
Description
Technical field
The utility model relates to technical field of hydraulic, particularly a kind of wheeled crane and Hydraulic Balancing Circuit thereof.
Background technique
Hydraulic Balancing Circuit is in order to prevent that the workpiece of vertical solution cylinder pressure and vertical motion from falling voluntarily and certain resistance is set on loop owing to conducting oneself with dignity, produce certain back pressure and make its loop steadily declining, the occasion that it is widely used in engineering machinery and has vertical motion parts.
Now in conjunction with Fig. 1, the Hydraulic Balancing Circuit that is applied to wheeled crane of take is example, and element and the working principle thereof of conventional Hydraulic Balancing Circuit is described.As shown in Figure 1, this Hydraulic Balancing Circuit comprise the oil hydraulic cylinder 1 that is arranged in system circuit ' and equilibrium valve 2 '; Wherein, equilibrium valve 2 ' comprise be arranged in parallel in oil hydraulic cylinder 1 ' rodless cavity side oil circuit on one-way valve 21 ' and sequence valve 22 ', sequence valve 22 ' control port be communicated with rod chamber side oil circuit.
When making rodless cavity, operation system main control valve (not shown) is communicated with system pressure oil circuit, when rod chamber is communicated with system oil return oil circuit, control port is without pressure, sequence valve 22 ' close, pressure oil liquid, by one-way valve 21 ' enter rodless cavity, promotes piston rod up; When switching to rodless cavity, operation system main control valve is communicated with system oil return oil circuit, rod chamber and system pressure oil circuit, control port makes sequence valve 22 ' unlatching under system pressure effect, and rodless cavity inner fluid is by sequence valve 22 ' be back to system oil return oil circuit, oil hydraulic cylinder 1 ' descending.Oil hydraulic cylinder 1 ' in descending process, when the downstream rate under load and piston rod deadweight double action surpasses the delivery rate of system, form vacuum and produce negative pressure in rod chamber, control port pressure drop is to setting value, sequence valve 22 ' close, oil hydraulic cylinder 1 ' locking.
Obviously, by aforementioned hydraulic balanced loop guaranteed oil hydraulic cylinder 1 ' normal up basis on, can steadily decline, avoided its descending and security incident that may cause fast under load and the piston rod deadweight double action.But, oil hydraulic cylinder 1 ' in descending process, rod chamber produces negative pressure and makes sequence valve 22 ' close, oil hydraulic cylinder 1 ' locking, however sequence valve 22 ' close and make rod chamber pressure rise, when rising to the setting value of control port, sequence valve 22 ' unlatching, makes oil hydraulic cylinder 1 ' continue descending.Go round and begin again repetition like this until by main control valve shut-down operation.Obviously, equilibrium valve 2 ' constantly open and close has caused oil hydraulic cylinder 1 ' constantly stop to drop out existing play creeping phenomenon, so not only shortened oil hydraulic cylinder 1 ' working life, and reduced the running stability of wheeled crane car load.
In view of this, those skilled in the art urgently look for another way provides a kind of Hydraulic Balancing Circuit, is realizing on the latch functions basis of oil hydraulic cylinder, avoids its play creeping phenomenon in descending process.
Model utility content
For above-mentioned defect, core object of the present utility model is, a kind of wheeled crane and Hydraulic Balancing Circuit thereof are provided, and is realizing on the latch functions basis of oil hydraulic cylinder, avoids its play creeping phenomenon in descending process.
Hydraulic Balancing Circuit provided by the utility model, comprising:
Oil hydraulic cylinder, for being communicated with system oil-way, its axis is from the horizontal by angle setting;
Equilibrium valve, is arranged at the system oil-way being communicated with the lower active chamber of described oil hydraulic cylinder, and in two actuator ports of the balance control port of described equilibrium valve and described equilibrium valve, one is communicated with, and also comprises:
First direction control valve, is arranged between described balance control port and hydraulic oil container, to control conducting and the disconnection of described balance control port and described hydraulic oil container; And be configured to: the conducting of described balance control port and described hydraulic oil container, described oil hydraulic cylinder is positioned at working state, the disconnection of described balance control port and described hydraulic oil container, described oil hydraulic cylinder switches to off working state.
Preferably, between described balance control port and the actuator port of described equilibrium valve, be provided with throttle orifice.
Preferably, also comprise relief valve, described relief valve is arranged between described lower active chamber and described hydraulic oil container, and its overflow control port is communicated with described lower active chamber, and its overflow control port is communicated with described lower active chamber.
Preferably, also comprise differential valve, described differential valve is arranged between the upper active chamber and lower active chamber of described oil hydraulic cylinder, with pilot pressure fluid, by described upper active chamber, flows into described lower active chamber; And be configured to: in the up process of described oil hydraulic cylinder, described differential valve pilot pressure fluid flows into described lower active chamber by described upper active chamber.
Preferably, described differential valve comprises one-way valve and second direction control valve, described one-way valve flows to described lower active chamber for fluid by described upper active chamber, described second direction control valve is arranged between described upper active chamber and described one-way valve and system oil return oil circuit, to control described upper active chamber and described one-way valve or the conducting of described system oil return oil circuit.
Preferably, described second direction control valve is specially hydraulic control position control valve, and in two actuator ports of the Differential Control hydraulic fluid port of described second direction control valve and described equilibrium valve, one is communicated with.
Preferably, also comprise third direction control valve, described third direction control valve is arranged between described Differential Control hydraulic fluid port and described equilibrium valve and described hydraulic oil container, to control the conducting of described Differential Control hydraulic fluid port and described equilibrium valve or described hydraulic oil container.
Preferably, between described Differential Control hydraulic fluid port and described third direction control valve, be provided with throttle orifice.
Preferably, described first direction control valve is or/and described third direction control valve is Electromagnetic Control mode.
The utility model also provides a kind of wheeled crane, comprise hydraulic control system, described hydraulic control system comprises oil hydraulic pump, hydraulic oil container and Hydraulic Balancing Circuit, also comprise the principal direction control valve that is arranged at described balanced loop and described oil hydraulic pump and described hydraulic oil container, to control the upper active chamber of the oil hydraulic cylinder of described Hydraulic Balancing Circuit, be communicated with described oil hydraulic pump, the lower active chamber of described oil hydraulic cylinder is communicated with described hydraulic oil container, or, the upper active chamber of the oil hydraulic cylinder of described Hydraulic Balancing Circuit is communicated with described hydraulic oil container, the lower active chamber of described oil hydraulic cylinder is communicated with described oil hydraulic pump, described Hydraulic Balancing Circuit is specially Hydraulic Balancing Circuit as above.
With respect to content in background technique, Hydraulic Balancing Circuit provided by the utility model, comprises that axis is provided for the oil hydraulic cylinder being communicated with system oil-way from the horizontal by angle, and is arranged at the equilibrium valve of the system oil-way being communicated with the lower active chamber of oil hydraulic cylinder; Wherein, in two actuator ports of the balance control port of this equilibrium valve and equilibrium valve, one is communicated with, and also comprises the first direction control valve being arranged between balance control port and hydraulic oil container, to control conducting and the disconnection of balance control port and hydraulic oil container.And be configured to: the conducting of balance oil circuit control and hydraulic oil container, oil hydraulic cylinder is positioned at working state, the disconnection of balance oil circuit control and hydraulic oil container, oil hydraulic cylinder switches to off working state.
Than prior art, the utility model is by adopting internal control type equilibrium valve, the pressure oil liquid of continous-stable is provided for balance control port in the descending process of oil hydraulic cylinder, oil hydraulic cylinder is steadily declined, thereby avoided available technology adopting externally controlled type equilibrium valve, and cause the generation of the play creeping phenomenon of oil hydraulic cylinder in descending process, and then the working life of oil hydraulic cylinder and the dynamic stability of Hydraulic Balancing Circuit have been improved.In addition, by first direction control valve, control conducting and the disconnection of balance control port and hydraulic oil container, can need at any time oil hydraulic cylinder be switched to the off working state of locking by the working state of stretching out/retracting according to practical operation situation, thereby improve job security and the automatic control level of oil hydraulic cylinder.Also have, when oil hydraulic cylinder occurs in descending process that pressure source disappears or during the urgency such as equilibrium valve is stuck, makes lower active chamber internal pressure fluid flow back into hydraulic oil container via first direction control valve, can guarantee in case of emergency descending smoothly of oil hydraulic cylinder.Obviously, the setting by first direction control valve makes Hydraulic Balancing Circuit also possess emergent lowering function, thereby has improved hydraulic cylinder works safety and reliability.In another preferred version of the present utility model, Hydraulic Balancing Circuit also comprises and is arranged at the upper active chamber of oil hydraulic cylinder and the differential valve between lower active chamber, this differential valve comprises one-way valve and second direction control valve, wherein, one-way valve is for making the upper active chamber internal pressure fluid of oil hydraulic cylinder flow to lower active chamber, second direction control valve is arranged between active chamber and one-way valve and system oil return oil circuit, to control upper active chamber and one-way valve or the conducting of system oil return oil circuit.Also comprise and be arranged at third direction control valve between Differential Control hydraulic fluid port and equilibrium valve and hydraulic oil container, to control the conducting of Differential Control hydraulic fluid port and equilibrium valve or hydraulic oil container.
When needs oil hydraulic cylinder fast uplink, by controlling third direction control valve, make the actuator port conducting of Differential Control hydraulic fluid port and equilibrium valve, pressure oil liquid is controlled upper active chamber and the one-way valve of second direction control valve conducting oil hydraulic cylinder, via one-way valve and equilibrium valve, flow into the lower active chamber that two-way pressure oil liquid converges rear inflow oil hydraulic cylinder, thereby realize the fast uplink of oil hydraulic cylinder under idle condition, improved the working efficiency of Hydraulic Balancing Circuit.
Obviously, in this programme, differential circuit is by the realization that jointly controls of second direction control valve and the 3rd control valve, solved the simple reversing impact that adopts the conducting of the upper and lower active chamber of solenoid directional control valve control oil hydraulic cylinder and form in prior art, thereby extended the working life of oil hydraulic cylinder and improved its stable working.Meanwhile, also overcome and in prior art, only adopted Pilot operated check valve and cause the uncontrollable drawback of differential action, thereby improved significantly the automatic control level of Hydraulic Balancing Circuit.
Accompanying drawing explanation
Fig. 1 shows the control principle drawing of existing Hydraulic Balancing Circuit;
Fig. 2 shows the control principle drawing of Hydraulic Balancing Circuit embodiment provided by the utility model.
Corresponding relation in Fig. 1 between reference character and all parts title:
1 ' oil hydraulic cylinder, 2 ' equilibrium valve, 21 ' one-way valve, 22 ' sequence valve.
Corresponding relation in Fig. 2 between reference character and all parts title:
1 oil hydraulic cylinder, 2 equilibrium valves, 3 two connection solenoid directional control valves, 4 hydraulic oil containers, 5 relief valves, 6 differential valves, 61 one-way valves, 62 two-bit triplet hydraulicdirectional control valves, 63 two-bit triplet solenoid directional control valves, 7 throttle orifices.
Embodiment
Core of the present utility model is, a kind of wheeled crane and Hydraulic Balancing Circuit thereof are provided, this Hydraulic Balancing Circuit is by adopting internal control type equilibrium valve, and control the control port of equilibrium valve and the conducting of hydraulic oil container and disconnection by position control valve, realize oil hydraulic cylinder at an arbitrary position can the basis of latch functions on, solve the play creeping phenomenon that in prior art, oil hydraulic cylinder exists in descending process, thereby improved job security and the stationarity of wheeled crane.
Without loss of generality, now take by reference to the accompanying drawings and be applied to wheeled crane as example, the specific embodiment of the Hydraulic Balancing Circuit providing described in the utility model is described.Be appreciated that in this programme, the Applicable scope of Hydraulic Balancing Circuit is not limited in wheeled crane, can also be applicable to the occasion that other liftings that need oil hydraulic cylinder realize action.
Refer to Fig. 2, the figure shows the control principle drawing of Hydraulic Balancing Circuit embodiment provided by the utility model.
As shown in Figure 2, in this programme, Hydraulic Balancing Circuit comprises that axis is from the horizontal by 90 ° of angle settings and the oil hydraulic cylinder 1 for being communicated with system oil-way, and is arranged at the equilibrium valve 2 of the system oil-way being communicated with the lower active chamber of oil hydraulic cylinder 1; Wherein, the balance control port of this equilibrium valve 2 is communicated with the upstream side actuator port of equilibrium valve 2, also comprise the 2/2-way solenoid directional control valve 3 being arranged between balance control port and hydraulic oil container 4, to control conducting and the disconnection of balance control port and hydraulic oil container 4.And be configured to: the conducting of balance oil circuit control and hydraulic oil container 4, oil hydraulic cylinder 1 is positioned at and stretches out or retraction working state, the disconnection of balance oil circuit control and hydraulic oil container 4, oil hydraulic cylinder 1 switches to the off working state of locking.
Than prior art, this programme is by adopting internal control type equilibrium valve 2, the pressure oil liquid of continous-stable is provided for balance control port in the descending process of oil hydraulic cylinder 1, oil hydraulic cylinder 1 is steadily declined, thereby avoided available technology adopting externally controlled type equilibrium valve 2, and cause the generation of the play creeping phenomenon of oil hydraulic cylinder 1 in descending process, and then the working life of oil hydraulic cylinder 1 and the dynamic stability of Hydraulic Balancing Circuit have been improved.In addition, by 2/2-way solenoid directional control valve 3, control conducting and the disconnection of balance control port and hydraulic oil container 4, can need at any time oil hydraulic cylinder 1 be switched to the off working state of locking by the working state of stretching out/retracting according to practical operation situation, thereby improve job security and the automatic control level of oil hydraulic cylinder 1.Also have, when oil hydraulic cylinder 1 occurs in descending process that pressure source disappears or during the urgency such as equilibrium valve is stuck, make lower active chamber internal pressure fluid flow back into hydraulic oil container 4 via 2/2-way solenoid directional control valve 3, can guarantee in case of emergency descending smoothly of oil hydraulic cylinder 1.Obviously, the setting by 2/2-way solenoid directional control valve 3 makes Hydraulic Balancing Circuit also possess emergent lowering function, thereby can further improve oil hydraulic cylinder 1 job security and reliability.
It should be noted that, the first direction control valve in this programme is specially 2/2-way solenoid directional control valve 3, is certainly meeting on the basis of commutation function requirement, and first direction control valve also can adopt 2/2-way hand-operated direction valve.In addition, in this programme, the balance control port of equilibrium valve 2 is specifically communicated with the upstream side actuator port of equilibrium valve 2, certainly, is meeting on the basis of controlling equilibrium valve 2 switching functions, and this balance control port also can be communicated with the downstream side actuator port of equilibrium valve 2.Additionally, oil hydraulic cylinder 1 axis and substantially horizontal angle can be for except 90 ° of arbitrarily angled values that are in this programme.
Further, continue referring to Fig. 2, the Hydraulic Balancing Circuit that this programme provides also comprises the relief valve 5 being arranged between lower active chamber and hydraulic oil container 4.The first actuator port of this relief valve 5 is communicated with hydraulic oil container 4, and its second actuator port is communicated with lower active chamber, and its overflow control port is communicated with lower active chamber.
Under oil hydraulic cylinder 1 normal working, relief valve 5 is in normally off; Once oil hydraulic cylinder 1 latch system oil temperature rising pressure increases, can be by relief valve overflow 5 decompressions, in case locking system pressure is excessive, thereby further improve job security and the reliability of entire system.
In addition, aforementioned hydraulic balanced loop also comprises and is arranged at the upper active chamber of oil hydraulic cylinder 1 and the differential valve 6 between lower active chamber, this differential valve 6 comprises one-way valve 61 and two-bit triplet pilot operated directional control valve 62, wherein, one-way valve 61 is for making the upper active chamber internal pressure fluid of oil hydraulic cylinder 1 flow to lower active chamber, two-bit triplet pilot operated directional control valve 62 is arranged between active chamber and one-way valve 61 and system oil return oil circuit, to control upper active chamber and one-way valve 61 or the conducting of system oil return oil circuit, the Differential Control hydraulic fluid port of two-bit triplet pilot operated directional control valve 62 is communicated with the downstream side actuator port of equilibrium valve 2.Also comprise and be arranged at two-bit triplet solenoid directional control valve 63 between Differential Control hydraulic fluid port and equilibrium valve 2 and hydraulic oil container 4, to control the conducting of Differential Control hydraulic fluid port and equilibrium valve 2 or hydraulic oil container 4.
When needs oil hydraulic cylinder 1 fast uplink, by controlling third direction control valve, make the actuator port conducting of Differential Control hydraulic fluid port and equilibrium valve 2, pressure oil liquid is controlled upper active chamber and the one-way valve 61 of second direction control valve conducting oil hydraulic cylinder 1, via one-way valve 61 and equilibrium valve 2, flow into the lower active chamber that two-way pressure oil liquid converges rear inflow oil hydraulic cylinder 1, thereby realize the fast uplink of oil hydraulic cylinder 1 under idle condition, improved the working efficiency of Hydraulic Balancing Circuit.
Obviously, in this programme, differential valve is by the realization that jointly controls of second direction control valve and the 3rd control valve, solved the simple reversing impact that adopts the conducting of solenoid directional control valve control oil hydraulic cylinder 1 upper and lower active chamber and form in prior art, thereby extended the working life of oil hydraulic cylinder 1 and improved its stable working.Meanwhile, also overcome and in prior art, only adopted Pilot operated check valve and cause the uncontrollable drawback of differential action, thereby improved significantly the automatic control level of Hydraulic Balancing Circuit.
It should be noted that, in this programme, differential valve 6 also can adopt other control valve groups, and for example differential valve 6 is only comprised of one-way valve 61 and second direction control valve; Wherein, second direction control valve can for two-bit triplet manually/solenoid directional control valve, this two-bit triplet manually/solenoid directional control valve is arranged between lower active chamber and one-way valve 61 and system oil-way, to control the conducting of lower active chamber and one-way valve 61 or system oil-way; Also can be Pilot operated check valve, its control port be communicated with lower active chamber, coordinates one-way valve 61 pilot pressure fluid to flow into lower active chamber by upper active chamber.
Be appreciated that and meeting on the basis of commutation function requirement, in this programme, third direction control valve also can adopt two-bit triplet hand-operated direction valve.In addition, second direction control valve in this programme, be that the Differential Control hydraulic fluid port of two-bit triplet pilot operated directional control valve 62 and the downstream side actuator port of equilibrium valve 2 are communicated with, when in the up process of oil hydraulic cylinder 1, differential valve 6 is worked, can improve the speed of response that Differential Control hydraulic fluid port changes pressure, thereby the whole work efficiency of Hydraulic Balancing Circuit can be provided.Certainly, meeting on the basis of commutation function requirement, the Differential Control hydraulic fluid port of two-bit triplet pilot operated directional control valve 62 is communicated with the upstream side actuator port of equilibrium valve 2.
In addition, the balance control port of the Differential Control hydraulic fluid port of two-bit triplet pilot operated directional control valve 62 and two-bit triplet solenoid directional control valve 63, equilibrium valve 2 and hydraulic oil container 4 in this programme, and being provided with throttle orifice 7 between lower active chamber and hydraulic oil container 4, its object is to impact by eliminating stress the stable working that improves Hydraulic Balancing Circuit.
Except aforementioned hydraulic balanced loop, the utility model also provides a kind of wheeled crane, comprise hydraulic control system, hydraulic control system comprises oil hydraulic pump, main hydraulic oil container and Hydraulic Balancing Circuit, also comprise the principal direction control valve that is arranged at balanced loop and oil hydraulic pump and main hydraulic oil container, to control the upper active chamber of the oil hydraulic cylinder of Hydraulic Balancing Circuit, be communicated with oil hydraulic pump, the lower active chamber of oil hydraulic cylinder is communicated with main hydraulic oil container, or, the upper active chamber of controlling the oil hydraulic cylinder of Hydraulic Balancing Circuit is communicated with main hydraulic oil container, the lower active chamber of oil hydraulic cylinder is communicated with oil hydraulic pump, Hydraulic Balancing Circuit is specially Hydraulic Balancing Circuit as above.The primary functional elements and the working principle thereof that are appreciated that this wheeled crane of formation are identical with prior art, and those skilled in the art can realize completely based on prior art, so repeat no more herein.
The foregoing is only preferred implementation of the present utility model, do not form the restriction to the utility model protection domain.Any any modification of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in claim protection domain of the present utility model.
Claims (10)
1. a Hydraulic Balancing Circuit, comprising:
Oil hydraulic cylinder (1), for being communicated with system oil-way, its axis is from the horizontal by angle setting;
Equilibrium valve (2), be arranged at the system oil-way being communicated with the lower active chamber of described oil hydraulic cylinder (1), it is characterized in that, in two actuator ports of the balance control port of described equilibrium valve (2) and described equilibrium valve (2), one is communicated with, and also comprises:
First direction control valve (3), is arranged between described balance control port and hydraulic oil container (4), to control conducting and the disconnection of described balance control port and described hydraulic oil container (4); And be configured to: the conducting of described balance control port and described hydraulic oil container (4), described oil hydraulic cylinder (1) is positioned at working state; The disconnection of described balance control port and described hydraulic oil container (4), described oil hydraulic cylinder (1) switches to off working state.
2. Hydraulic Balancing Circuit according to claim 1, is characterized in that, between described balance control port and the actuator port of described equilibrium valve (2), is provided with throttle orifice (7).
3. Hydraulic Balancing Circuit according to claim 1, it is characterized in that, also comprise relief valve (5), described relief valve (5) is arranged between described lower active chamber and described hydraulic oil container (4), and its overflow control port is communicated with described lower active chamber.
4. according to the Hydraulic Balancing Circuit described in any one in claims 1 to 3, it is characterized in that, also comprise differential valve (6), described differential valve (6) is arranged between the upper active chamber and lower active chamber of described oil hydraulic cylinder (2); And be configured to: in the up process of described oil hydraulic cylinder, described differential valve (6) pilot pressure fluid flows into described lower active chamber by described upper active chamber.
5. Hydraulic Balancing Circuit according to claim 4, it is characterized in that, described differential valve (6) comprises one-way valve (61) and second direction control valve (62), described one-way valve (61) flows to described lower active chamber for fluid by described upper active chamber, described second direction control valve (62) is arranged between described upper active chamber and described one-way valve (61) and system oil return oil circuit, to control described upper active chamber and described one-way valve (61) or the conducting of described system oil return oil circuit.
6. Hydraulic Balancing Circuit according to claim 5, it is characterized in that, described second direction control valve (62) is specially hydraulic control position control valve, and in two actuator ports of the Differential Control hydraulic fluid port of described second direction control valve (62) and described equilibrium valve, one is communicated with.
7. Hydraulic Balancing Circuit according to claim 6, it is characterized in that, also comprise third direction control valve (63), described third direction control valve (63) is arranged between described Differential Control hydraulic fluid port and described equilibrium valve (2) and described hydraulic oil container (4), to control the conducting of described Differential Control hydraulic fluid port and described equilibrium valve (2) or described hydraulic oil container (4).
8. Hydraulic Balancing Circuit according to claim 7, is characterized in that, between described Differential Control hydraulic fluid port and described third direction control valve (63), is provided with throttle orifice (7).
9. Hydraulic Balancing Circuit according to claim 8, is characterized in that, described first direction control valve (3) is or/and described third direction control valve (63) is Electromagnetic Control mode.
10. a wheeled crane, comprise hydraulic control system, described hydraulic control system comprises oil hydraulic pump, hydraulic oil container and Hydraulic Balancing Circuit, also comprise the principal direction control valve that is arranged at described balanced loop and described oil hydraulic pump and described hydraulic oil container, to control the upper active chamber of the oil hydraulic cylinder of described Hydraulic Balancing Circuit, be communicated with described oil hydraulic pump, the lower active chamber of described oil hydraulic cylinder is communicated with described hydraulic oil container, or, the upper active chamber of the oil hydraulic cylinder of described Hydraulic Balancing Circuit is communicated with described hydraulic oil container, the lower active chamber of described oil hydraulic cylinder is communicated with described oil hydraulic pump, it is characterized in that, described Hydraulic Balancing Circuit is specially Hydraulic Balancing Circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320488357.XU CN203430888U (en) | 2013-08-09 | 2013-08-09 | Wheeled crane and hydraulic balance loop thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320488357.XU CN203430888U (en) | 2013-08-09 | 2013-08-09 | Wheeled crane and hydraulic balance loop thereof |
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| Publication Number | Publication Date |
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| CN203430888U true CN203430888U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320488357.XU Expired - Fee Related CN203430888U (en) | 2013-08-09 | 2013-08-09 | Wheeled crane and hydraulic balance loop thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN203430888U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165166A (en) * | 2014-07-30 | 2014-11-26 | 株洲中研流体技术有限公司 | Compact-type telescopic oil cylinder changeover valve set |
| CN105041745A (en) * | 2015-06-29 | 2015-11-11 | 南阳二机石油装备(集团)有限公司 | Differential control system of double-acting single-stage piston hydraulic cylinder |
| CN110790158A (en) * | 2019-10-25 | 2020-02-14 | 徐州重型机械有限公司 | System and method for extending oil cylinder of boom |
-
2013
- 2013-08-09 CN CN201320488357.XU patent/CN203430888U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165166A (en) * | 2014-07-30 | 2014-11-26 | 株洲中研流体技术有限公司 | Compact-type telescopic oil cylinder changeover valve set |
| CN104165166B (en) * | 2014-07-30 | 2016-08-24 | 株洲中研流体技术有限公司 | A kind of compact telescopic oil cylinder switching valve group |
| CN105041745A (en) * | 2015-06-29 | 2015-11-11 | 南阳二机石油装备(集团)有限公司 | Differential control system of double-acting single-stage piston hydraulic cylinder |
| CN110790158A (en) * | 2019-10-25 | 2020-02-14 | 徐州重型机械有限公司 | System and method for extending oil cylinder of boom |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20200809 |
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| CF01 | Termination of patent right due to non-payment of annual fee |