CN202833359U - Open-type hydraulic system and engineering machinery - Google Patents
Open-type hydraulic system and engineering machinery Download PDFInfo
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- CN202833359U CN202833359U CN 201220413824 CN201220413824U CN202833359U CN 202833359 U CN202833359 U CN 202833359U CN 201220413824 CN201220413824 CN 201220413824 CN 201220413824 U CN201220413824 U CN 201220413824U CN 202833359 U CN202833359 U CN 202833359U
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Abstract
The utility model discloses an open-type hydraulic system and engineering machinery. The open-type hydraulic system comprises a first oil channel, a second oil channel, a first one-way valve, a second one-way valve and a directional control valve, one oil channel is used as an oil supply channel of a driving motor, and the other oil channel is used as an oil return channel. An oil inlet of the first one-way valve is communicated with the first oil channel, and an oil outlet of the first one-way valve is communicated with a first motor oil opening of the driving motor. An oil inlet of the second one-way valve is communicated with the second oil channel, and an oil outlet of the second is communicated with a second motor oil opening of the driving motor. The directional control valve is provided with three working states. When a hydraulic pump of the hydraulic system drains oil, the hydraulic pump stops providing the oil for the system. When the direction control valve is in a third working state, under the function of closure of the first one-way valve and the second one-way valve, the driving motor and the directional control valve form a closed loop, and hydraulic oil circulates a period on the closed loop. Compared with the prior art, not only is suction phenomenon of the driving motor avoided, but also impact of the hydraulic system is reduced.
Description
Technical field
The utility model relates to engineering machinery field, particularly a kind of open type hydraulic system and engineering machinery.
Background technique
At present, fully hydraulic driven machinery mainly adopts closed type hydraulic system or open type hydraulic system such as hydraulic grader.In the closed type hydraulic system, the oil inlet pipe of oil hydraulic pump directly links to each other with the return tube of executive component, and working liquid body carries out closed circulation in the pipeline of system, and system radiating is not good.In the open type hydraulic system, oil hydraulic pump is from the fuel tank oil suction, and to the executive component fuel feeding, the oil return of executive component is flowed back to fuel tank through selector valve again by selector valve.The fluid of having worked in the open type hydraulic system flows back to fuel tank, and the thermolysis that can bring into play thus fuel tank improves the thermal diffusivity of system.Fig. 1 is the principle schematic of existing open type hydraulic system, and the defective of existing open type hydraulic system is: when selector valve returns meta (during the oil hydraulic pump draining), drive motor easily occurs to inhale empty, affects the working life of drive motor; And this moment, hydraulic system was hit greatlyr, also made its using scope be subject to impact.
The model utility content
In view of this, the utility model proposes a kind of open type hydraulic system and engineering machinery, to solve existing open type hydraulic system when the oil hydraulic pump draining, large problem that drive motor is easily inhaled empty and hydraulic system is hit.
On the one hand, the utility model provides a kind of open type hydraulic system, comprising: the first oil circuit and the second oil circuit, and in described the first oil circuit and described the second oil circuit, one of them is as the oil supply gallery of drive motor, and another is as the drainback passage of drive motor; The first one-way valve, its filler opening communicates with described the first oil circuit, and oil outlet communicates with the first motor hydraulic fluid port of described drive motor; The second one-way valve, its filler opening communicates with described the second oil circuit, and oil outlet communicates with the second motor hydraulic fluid port of described drive motor; Position control valve, it is provided with the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port; Described the first hydraulic fluid port and described the second motor hydraulic fluid port communicate, and described the 3rd hydraulic fluid port communicates with described the first motor hydraulic fluid port, and described the second hydraulic fluid port communicates with described the second oil circuit, and described the 4th hydraulic fluid port communicates with described the first oil circuit; Described position control valve has three kinds of working staties: under the first working state, described the first hydraulic fluid port communicates with described the second hydraulic fluid port; Under the second working state, described the 3rd hydraulic fluid port communicates with described the 4th hydraulic fluid port; Under the 3rd working state, described the first hydraulic fluid port communicates with described the 3rd hydraulic fluid port.
Further, described position control valve is three position four-way electromagnetic valve.
Further, above-mentioned open type hydraulic system also comprises: the first relief valve, and the filler opening of described the first relief valve links to each other with the oil outlet of described the first one-way valve, and described the first relief valve oil outlet communicates with described the first hydraulic fluid port.
Further, above-mentioned open type hydraulic system also comprises: the second relief valve, and the filler opening of described the second relief valve links to each other with the oil outlet of described the second one-way valve, and oil outlet communicates with described the 3rd hydraulic fluid port.
Further, above-mentioned open type hydraulic system also comprises: main valve, oil hydraulic pump and draining path, and described the first oil circuit links to each other with described draining path with described oil hydraulic pump by described main valve with described the second oil circuit; Described main valve has three kinds of working staties: under the first working state, described the first oil circuit communicates with the oil outlet of described oil hydraulic pump, and described the second oil circuit communicates with described draining path; Under the second working state, described the second oil circuit communicates with the oil outlet of described oil hydraulic pump, and described the first oil circuit communicates with described draining path; Under the 3rd working state, the oil outlet of described the first oil circuit, the second oil circuit, draining path and oil hydraulic pump all communicates.
Further, described main valve is three position four-way electromagnetic valve.
Further, described open type hydraulic system has: controller, and described controller comprises: acquiring unit, for the rotating speed that obtains the motor that drives described hydraulic pump works; Judging unit is connected with described acquiring unit signal, is used for judging that whether described rotating speed is less than predefined value; Processing unit is connected with described judging unit signal, is used for sending signal at described rotating speed during less than predefined value described position control valve is worked under the 3rd working state.
Further, described position control valve also comprises throttle valve, and described throttle valve is arranged between described the first hydraulic fluid port and described the 3rd hydraulic fluid port.
On the other hand, the utility model also provides a kind of engineering machinery, is provided with above-mentioned each described open type hydraulic system.
Further, described engineering machinery is hydraulic grader.
A kind of open type hydraulic system that the utility model provides in use, when the first oil circuit is in for oil condition, when the second oil circuit is in the oil return state, can control position control valve is under the first working state, making intrasystem hydraulic oil is the drive motor fuel feeding by the first oil circuit, the first one-way valve, and then the first hydraulic fluid port, the second hydraulic fluid port, the second oil circuit by position control valve flows back to fuel tank.When the second oil circuit is in for oil condition, when the first oil circuit is in the oil return state, can control position control valve and be in the second working state, intrasystem hydraulic oil is the drive motor fuel feeding by the second oil circuit, the second one-way valve, and then the 3rd hydraulic fluid port, the 4th hydraulic fluid port, the first oil circuit by position control valve flows back to fuel tank.In the time can controlling position control valve place the first oil circuit and the equal fuel cut-off of the second oil circuit (when the oil hydraulic pump draining time), can control position control valve and be in the 3rd working state, under the crown_interception of the first one-way valve and the second one-way valve, form closed circuit between drive motor and the position control valve, hydraulic oil will be in this closed circuit cocycle a period of time, compared with prior art, not only avoid drive motor generation emptying phenomenon, and reduced the impact that hydraulic system is subject to.
The utility model also provides a kind of engineering machinery that is provided with above-mentioned open type hydraulic system, because above-mentioned open type hydraulic system has above-mentioned effect, therefore, the engineering machinery that is provided with this open type hydraulic system also has corresponding technique effect.
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 principle schematic of prior art middle open type hydraulic system;
The principle schematic of the open type hydraulic system that Fig. 2 provides for the utility model embodiment one;
The principle schematic of the open type hydraulic system that Fig. 3 provides for the utility model embodiment two;
The principle schematic of the open type hydraulic system that Fig. 4 provides for the utility model embodiment three;
Fig. 5 is the structural representation of controller described in the utility model embodiment.
Description of reference numerals:
1 fuel tank, 2 oil hydraulic pumps
3 main valve P main valve hydraulic fluid ports
T main valve hydraulic fluid port A main valve hydraulic fluid port
B main valve hydraulic fluid port 4 drive motors
The second hydraulic fluid port of the first hydraulic fluid port a2 drive motor of a1 drive motor
101 first oil circuits, 102 second oil circuits
103 draining paths, 5 first one-way valves
6 second one-way valves, 7 position control valves
7a position control valve 71 throttle valve
P1 the first hydraulic fluid port p2 the second hydraulic fluid port
P3 the 3rd hydraulic fluid port p4 the 4th hydraulic fluid port
8 safety valves, 91 first relief valves
92 second relief valves, 10 controllers
101 acquiring units, 102 judging units
103 processing units
Embodiment
Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment in the utility model can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Embodiment one
Please refer to Fig. 2, this open type hydraulic system comprises as shown in the figure:
The filler opening of oil hydraulic pump 2 links to each other with fuel tank 1;
(scheme left position) under the first working state, hydraulic fluid port P and A communicate, and hydraulic fluid port B and T communicate;
(scheme right position) under the second working state, hydraulic fluid port P and B communicate, and hydraulic fluid port A and T communicate;
Under the 3rd working state (meta among the figure), hydraulic fluid port P, T, A and B all communicate;
The first oil circuit 101 links to each other with main valve 3 with the second oil circuit 102, and one of them is as the oil supply gallery of drive motor 4, and another is as drainback passage, and draining path 103 is between main valve 3 and fuel tank 1; Particularly:
Main valve is 3 under the first working state, and the first oil circuit 101 communicates with the oil outlet of oil hydraulic pump 2, and the second oil circuit 102 communicates with draining path 103, and the first oil circuit 101 is as the oil supply gallery of drive motor 4, and the second oil circuit 102 is as the drainback passage of drive motor 4;
String is located at the first one-way valve 5 between the first oil circuit 101 and the drive motor 4, and its filler opening links to each other with the first oil circuit 101, and oil outlet links to each other with the first motor hydraulic fluid port a1 of drive motor 4;
String is located at the second one-way valve 6 between the second oil circuit 102 and the drive motor 4, and its filler opening links to each other with the second oil circuit 102, and oil outlet links to each other with the second motor hydraulic fluid port a2 of drive motor 4;
Under the first working state (upper), the first hydraulic fluid port p1 and the second hydraulic fluid port p2 communicate;
Under the second working state (upper), the 3rd hydraulic fluid port p3 and the 4th hydraulic fluid port p4 communicate;
Under the 3rd working state (meta), the first hydraulic fluid port p1 and the 3rd hydraulic fluid port p3 communicate.
Below in conjunction with concrete operative scenario (take hydraulic grader as example) the open type hydraulic system working principle of the present embodiment once is described:
When main valve 3 was in the first working state (left position), hydraulic fluid port P and the A of main valve 3 communicated, and the first oil circuit 101 communicates with the oil outlet of oil hydraulic pump 2, and the first oil circuit 101 is as the oil supply gallery of drive motor 4; Hydraulic fluid port B and T communicate, and the second oil circuit 102 communicates with draining path 103.Control simultaneously position control valve 7 and make it be in the first working state (upper), its first hydraulic fluid port p1 and the second hydraulic fluid port p2 communicate; Thus, the hydraulic oil that flows out from oil hydraulic pump 1 flows back to fuel tank 1 by the first hydraulic fluid port p1, the second hydraulic fluid port p2 of position control valve 7, the second oil circuit 102, main valve 3, the draining path 103 of main valve 3 hydraulic fluid port P, main valve 3 hydraulic fluid port A, the first oil circuit 101, the first one-way valve 5, drive motor 4, position control valve 7 successively; Thus, the second oil circuit 102 is as the drainback passage of drive motor 4.Hydraulic grader advances under this kind state.
When main valve 3 is in the second working state (right position), hydraulic fluid port P and the hydraulic fluid port B of main valve 3 communicate, and this moment, the oil outlet of main valve 3 communicated with the second oil circuit 102, and hydraulic fluid port A and T communicate, the second oil circuit 102 is as the oil supply gallery of drive motor 4, and the first oil circuit 101 communicates with draining path 103.Control simultaneously position control valve 7 and make it be in the second working state (the next), the 3rd hydraulic fluid port p3 and the 4th hydraulic fluid port p4 communicate; Thus, the hydraulic oil that flows out from oil hydraulic pump 1 flows back to fuel tank 1 by the 3rd hydraulic fluid port p3 of main valve 3 hydraulic fluid port P, main valve 3 hydraulic fluid port B, the second oil circuit 102, the second one-way valve 6, drive motor 4, position control valve 7, the 4th hydraulic fluid port p4, the first oil circuit 101, main valve 3 and the draining path 103 of position control valve 7 successively; Thus, the first oil circuit is as the drainback passage of drive motor 4.This kind state hydraulic grader retreats.
When main valve 3 was in the 3rd working state (meta), main valve 3 hydraulic fluid port P, T, A and B all communicated, and the first oil circuit 101 and the second oil circuit 102 all communicate with draining path 103.Under the effect of induced pressure, the hydraulic oil that flows out from oil hydraulic pump can directly flow back to fuel tank 1 by draining path 103, at this moment the first oil circuit 101 and the second oil circuit 102 equal fuel cut-offs; Control simultaneously position control valve 7 and make it be in the 3rd working state (meta), the first hydraulic fluid port p1 and the 3rd hydraulic fluid port p3 of position control valve 7 communicate; Because the damming effect of the first one-way valve 5 and the second one-way valve 6, intrasystem hydraulic oil will be reverse along the 3rd hydraulic fluid port p3 of position control valve 7, drive motor 4, the first hydraulic fluid port p1(or its) direction circulate, prevent that drive motor 4 from inhaling skies.And when oil pressure in the system was not enough, under suction function, the hydraulic oil in the fuel tank was by the first oil circuit 101, the first one-way valve 5, and/or the second oil circuit 102, the second one-way valve 6 are system's repairing, prevented that further drive motor 4 suctions are empty.
In order to prevent that hydraulic system internal cause pressure is excessive and hydraulic element are caused damage, also preferably be provided with safety valve 8 between the oil outlet of oil hydraulic pump 2 and the fuel tank 1.
The advantage of the open type hydraulic system that the present embodiment provides is: when the hydraulic-pressure pump draining, position control valve is in the 3rd working state, under the crown_interception of the first one-way valve and the second one-way valve, hydraulic oil between the first one-way valve and the second one-way valve can't flow back to fuel tank and carry out draining, but can between the first hydraulic fluid port, the 3rd hydraulic fluid port and the drive motor of position control valve, circulate, prevent that thus drive motor is inhaled empty problem under the state of the direct draining of oil hydraulic pump.And, because intrasystem hydraulic oil can circulate, therefore also reduced the impact that hydraulic system is subject between the first hydraulic fluid port, the 3rd hydraulic fluid port and the drive motor of position control valve.
Embodiment two
Please refer to Fig. 3, the open type hydraulic system that embodiment two provides and embodiment's one difference is, position control valve 7a also comprises: be arranged at the throttle valve 71 between the first hydraulic fluid port p1 and the 3rd hydraulic fluid port p3.
The working principle of the open type hydraulic system that the present embodiment provides and embodiment one are substantially similar, and difference is:
When main valve 3 is in the 3rd working state, when position control valve 7 was in the 3rd working state (meta), the hydraulic oil in intrasystem circulated between the first hydraulic fluid port p1 of the 3rd hydraulic fluid port p3 of position control valve 7a, drive motor 4, position control valve 7a and throttle valve 71.In the cyclic process, throttle valve 71 is regulated the flow of the hydraulic oil that at every turn passes through, and reduction of speed is carried out in the rotation of drive motor regulate, and realizes the fast braking of equipment, prevents from slipping car.
Therefore, the effect of setting up throttle valve 71 between the first hydraulic fluid port p1 and the 3rd hydraulic fluid port p3 is: during when the direct draining of oil hydraulic pump, throttle valve 71 provides back pressure for drive motor 4, realizes the fast braking of equipment, prevents from slipping car.
The advantage of the open type hydraulic system that the present embodiment provides is: when the direct draining of oil hydraulic pump, preventing can realizing fast braking when drive motor 4 from inhaling sky, prevent slide car phenomenon.
Embodiment three
See also Fig. 4, the open type hydraulic system that the present embodiment provides and embodiment's two difference is, also comprises:
The filler opening of the first relief valve 91, the first relief valves 91 links to each other with the oil outlet of the first one-way valve 5, the oil outlet of the first relief valve 91 with the first hydraulic fluid port p1 of position control valve link to each other;
The filler opening of the second relief valve 92, the second relief valves 92 links to each other with the oil outlet of the second one-way valve 6, and oil outlet links to each other with the 3rd hydraulic fluid port p3 of position control valve 7a.
The effect of the first relief valve 91 is: when main valve 3 is in the first working state, when position control valve 7a was in the first working state (mechanical forward travel state), 91 pairs of hydraulic systems of the first relief valve shielded, and prevent system overload;
The effect of the second relief valve is: when main valve 3 is in the second working state, when position control valve 7a was in the second working state (mechanical fallback state), 92 pairs of hydraulic systems of the second relief valve shielded, and prevent system overload.
The advantage of the open type hydraulic system that the present embodiment provides is: be provided with relief valve hydraulic system is protected, prevent that the situation of transshipping from occuring, the Security of hydraulic system is higher.
Further, as another preferred embodiment of the utility model, in the open type hydraulic system that above-described embodiment provides, also preferably have controller 10, as shown in Figure 5, this controller 10 comprises:
Acquiring unit 101 is for the rotating speed that obtains the motor that drives hydraulic pump works;
Judging unit 102 is connected with acquiring unit 101 signals, is used for judging that whether described rotating speed is less than predefined value;
When equipment is lost throttle, main valve also is in loses the front working state of throttle, if main valve is in the first working state or the second working state before losing throttle, but the first oil circuit and the equal fuel cut-off of the second oil circuit, the effect of setting up above-mentioned controller 10 is: lose throttle if be in, the data that processing unit 103 obtains by engine speed acquiring unit 101 and judging unit 102, control position control valve to the three working staties, make intrasystem hydraulic oil at the first hydraulic fluid port of position control valve, circulate between the 3rd hydraulic fluid port and the drive motor, drive motor was inhaled empty and slide car phenomenon when the equipment of preventing was lost throttle.
The engine speed acquiring unit is specifically as follows speed probe.Processing unit can be integrated in the control mechanism of position control valve.
Need to prove:
In above-described embodiment, main valve 3 is three position four-way electromagnetic valve, it will be understood by those skilled in the art that also to adopt other selector valves that can realize equal oil circuit leading role, for example, can also be with a plurality of valve pieces realization corresponding function that combines.
The Median Function of main valve is the H type, and selecting Median Function is that the effect of the selector valve of H type is: when the direct draining of oil hydraulic pump, guarantee that hydraulic circuit can carry out repairing from the fuel tank oil suction and then to hydraulic system, prevent that further drive motor from inhaling empty; Reduce Impact in Hydraulic System.It will be understood by those skilled in the art that it also can adopt Median Function is the position control valve of M type.
In above-described embodiment, position control valve 7 it will be understood by those skilled in the art that for Median Function is U-shaped three position four-way electromagnetic valve it also can adopt other can realize the selector valve of equal oil circuit leading role, for example, can also be with a plurality of valve pieces realization corresponding function that combines.
The utility model embodiment also provides a kind of engineering machinery that is provided with above-mentioned open type hydraulic system, such as hydraulic grader.Because above-mentioned open type hydraulic system has above-mentioned technique effect, therefore, the engineering machinery that is provided with open type hydraulic system also should possess corresponding technique effect, and the specific implementation process of its appropriate section is similar to the above embodiments, does not hereby give unnecessary details.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. an open type hydraulic system is characterized in that, comprising:
The first oil circuit (101) and the second oil circuit (102), in described the first oil circuit (101) and described the second oil circuit (102), one of them is as the oil supply gallery of drive motor (4), and another is as the drainback passage of drive motor (4);
The first one-way valve (5), its filler opening communicates with described the first oil circuit (101), and oil outlet communicates with the first motor hydraulic fluid port (a1) of described drive motor (4);
The second one-way valve (6), its filler opening communicates with described the second oil circuit (102), and oil outlet communicates with the second motor hydraulic fluid port (a2) of described drive motor (4);
Position control valve (7), it is provided with the first hydraulic fluid port (p1), the second hydraulic fluid port (p2), the 3rd hydraulic fluid port (p3) and the 4th hydraulic fluid port (p4); Described the first hydraulic fluid port (p1) and described the second motor hydraulic fluid port (a2) communicate, described the 3rd hydraulic fluid port (p3) communicates with described the first motor hydraulic fluid port (a1), described the second hydraulic fluid port (p2) communicates with described the second oil circuit (102), and described the 4th hydraulic fluid port (p4) communicates with described the first oil circuit (101);
Described position control valve (7) has three kinds of working staties:
Under the first working state, described the first hydraulic fluid port (p1) communicates with described the second hydraulic fluid port (p2);
Under the second working state, described the 3rd hydraulic fluid port (p3) communicates with described the 4th hydraulic fluid port (p4);
Under the 3rd working state, described the first hydraulic fluid port (p1) communicates with described the 3rd hydraulic fluid port (p3).
2. open type hydraulic system according to claim 1 is characterized in that, described position control valve (7) is three position four-way electromagnetic valve.
3. open type hydraulic system according to claim 1, it is characterized in that, also comprise: the first relief valve (91), the filler opening of described the first relief valve (91) links to each other with the oil outlet of described the first one-way valve (5), and described the first relief valve (91) oil outlet communicates with described the first hydraulic fluid port (p1).
4. open type hydraulic system according to claim 1, it is characterized in that, also comprise: the second relief valve (92), the filler opening of described the second relief valve (92) links to each other with the oil outlet of described the second one-way valve (6), and oil outlet communicates with described the 3rd hydraulic fluid port (p3).
5. according to claim 1 to 4 each described open type hydraulic systems, it is characterized in that, also comprise: main valve (3), oil hydraulic pump (2) and draining path (103), described the first oil circuit (101) links to each other with described draining path (103) with described oil hydraulic pump (2) by described main valve (3) with described the second oil circuit (102);
Described main valve (3) has three kinds of working staties:
Under the first working state, described the first oil circuit (101) communicates with the oil outlet of described oil hydraulic pump (2), and described the second oil circuit (102) communicates with described draining path (103);
Under the second working state, described the second oil circuit (102) communicates with the oil outlet of described oil hydraulic pump (2), and described the first oil circuit (101) communicates with described draining path (103);
Under the 3rd working state, the oil outlet of described the first oil circuit (101), the second oil circuit (102), draining path (103) and oil hydraulic pump (2) all communicates.
6. open type hydraulic system according to claim 5 is characterized in that, described main valve (3) is three position four-way electromagnetic valve.
7. open type hydraulic system according to claim 5 is characterized in that, described open type hydraulic system has: controller (10), and described controller (10) comprising:
Acquiring unit (101) is for the rotating speed that obtains the motor that drives described oil hydraulic pump (2) work;
Judging unit (102) is connected with described acquiring unit (101) signal, is used for judging that whether described rotating speed is less than predefined value;
Processing unit (103) is connected with described judging unit (102) signal, is used for sending signal at described rotating speed during less than predefined value described position control valve is worked under the 3rd working state.
8. according to claim 1 to 4 each described open type hydraulic systems, it is characterized in that, described position control valve also comprises throttle valve (71), and described throttle valve (71) is arranged between described the first hydraulic fluid port (p1) and described the 3rd hydraulic fluid port (p3).
9. an engineering machinery is characterized in that, is provided with the described open type hydraulic system of claim 1 to 9 any one.
10. engineering machinery according to claim 9 is characterized in that, described engineering machinery is hydraulic grader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220413824 CN202833359U (en) | 2012-08-20 | 2012-08-20 | Open-type hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220413824 CN202833359U (en) | 2012-08-20 | 2012-08-20 | Open-type hydraulic system and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN202833359U true CN202833359U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220413824 Expired - Fee Related CN202833359U (en) | 2012-08-20 | 2012-08-20 | Open-type hydraulic system and engineering machinery |
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| CN (1) | CN202833359U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852870A (en) * | 2012-08-20 | 2013-01-02 | 三一重工股份有限公司 | Open type hydraulic system and engineering machinery |
| CN110043523A (en) * | 2018-01-17 | 2019-07-23 | 雷沃重工股份有限公司 | Prevent that being emptied hydraulic system and hydraulic system prevents being emptied method |
-
2012
- 2012-08-20 CN CN 201220413824 patent/CN202833359U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852870A (en) * | 2012-08-20 | 2013-01-02 | 三一重工股份有限公司 | Open type hydraulic system and engineering machinery |
| CN102852870B (en) * | 2012-08-20 | 2015-09-09 | 三一重工股份有限公司 | Open type hydraulic system and engineering machinery |
| CN110043523A (en) * | 2018-01-17 | 2019-07-23 | 雷沃重工股份有限公司 | Prevent that being emptied hydraulic system and hydraulic system prevents being emptied method |
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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: 20130327 Termination date: 20170820 |
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| CF01 | Termination of patent right due to non-payment of annual fee |