CN205025846U - Backpressure valves and have underground scraper work systems of this backpressure valves - Google Patents
Backpressure valves and have underground scraper work systems of this backpressure valves Download PDFInfo
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- CN205025846U CN205025846U CN201520605563.3U CN201520605563U CN205025846U CN 205025846 U CN205025846 U CN 205025846U CN 201520605563 U CN201520605563 U CN 201520605563U CN 205025846 U CN205025846 U CN 205025846U
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Abstract
The utility model relates to a backpressure valves and have underground scraper work systems of this backpressure valves relates to the backpressure valves that is used for hydraulic system to go back to the oil pipe way and an underground scraper's work systems. Its purpose is that an energy consumption is low, pressure control range wide in order to provide, simple to operate's backpressure valves and have the underground scraper work systems of this kind of backpressure valves. The utility model relates to a backpressure valves includes the shuttle valve, and the shuttle valve has first control hydraulic fluid port and second control port, and the oil inlet of relief pressure valve is connected to the shuttle valve oil -out, and the oil inlet of damping stopper is connected to the oil -out of relief pressure valve, and the control mouth of the inserted valve normally opened is connected to the oil -out of damping stopper, and the inserted valve still has oil inlet and oil -out. Underground scraper work systems includes the hydraulic pump of fuel feeding, and actuating mechanism includes first working valve and second working valve, and the actuator port of first working valve connects the dump cylinder, and the actuator port of second working valve connects lift cylinder. Actuating mechanism's action is controlled by the pilot valve control group.
Description
Technical field
The utility model relates to a kind of hydraulic valve bank and a kind of subsurface excavation equipment, particularly relates to a kind of back pressure valve group for hydraulic system return line and a kind of underground carry scraper work system.
Background technique
Along with the development of global mine cause and the progress of science and technology, underground carry scraper has become the visual plant of underground enhanced recovery.It is large that it has throughput, and efficiency is high, maneuverability, the advantage that operational condition is good.But its operating environment is severe, and task is heavy.Improve the throughput of scraper, shorten the activity duration, increase the service life, concerning very important China's mining industry.
The hydraulic system of existing underground carry scraper, mainly comprises steering system, work system, braking system and cooling system.Many employings preferentially turn to, the control mode of Dual-pump flow-converging during work.Work system is wherein overburden work under swing arm decline and scraper bowl discharging operating mode, and because scraper bowl load-bearing is comparatively large, speed, easily occurs owing to there is cavitation phenomenon for shortage of oil.Especially oil hydraulic cylinder is by the operating mode pulled out fast, and during as rotated forward the large-tonnage scraper discharging of six-bar linkage, the discharge time can reach 2s, even less, now flow into the flow of cylinder hydraulic oil up to 600L/min, and flow system flow only has half even less.
So-called cavitation erosion, just refer in the fluid of oil hydraulic cylinder in the course of the work between piston and guide sleeve and be mixed into a certain amount of air, along with the change of pressure, gas in the middle of fluid can become bubble, when pressure is elevated to a certain degree, bubble will break under the effect of high pressure, thus is applied to rapidly on the surface of part by the gas of high temperature, high pressure, causes the corrosive damage of part.In order to prevent the generation of cavitating, usually back pressure valve being set on oil return circuit, can impacting by relieving hydraulic simultaneously.Existing technological scheme mainly contains following two kinds.A kind of scheme for be provided with separately back pressure valve on oil return circuit, and now do not produce cavitation erosion for meeting system, the setting pressure that back pressure valve is general is 1 ~ 1.5MPa; The operating valve of another kind of scheme adopts the KM300 series multi-way valve of PARKER company production, and 17bar low pressure relief valve can be selected to control for back pressure.As shown in Figure 3, the discharging operation of the corresponding scraper bowl of B1 in figure, the receipts bucket operation of the corresponding scraper bowl of C1, the decline operation of the corresponding swing arm of D2, the lifting operation of the corresponding swing arm of C2.This technological scheme is when scraper bowl discharging or swing arm decline, and the oil return of oil hydraulic cylinder is subject to the obstruction of low pressure relief valve 21, and preferentially to another chamber repairing of oil hydraulic cylinder, unnecessary hydraulic oil is by low pressure relief valve 21 overflow; When scraper bowl reversion or swing arm rise, the direct oil return in another chamber of oil hydraulic cylinder, not by low pressure relief valve 21.Discharging and decline loop have giving young employees remedial-courses in general knowledge and vocational skills fuel tap 22.In addition, this valve body is necessary for double back channel design.All there is certain problem in above-mentioned two schemes, for scheme one: no matter operation mechanism's whether action, back pressure valve all works, this will produce the unnecessary pressure loss and energy consumption for Constant Pump System, and the setting pressure of back pressure valve is less, therefore, this programme is not suitable for Constant Pump System, be generally used for variable pump systems, and current most of underground carry scraper all adopts quantitative system, particularly the scraper of less than 10 tons; For scheme two: the multi-way valve of most of producer, cannot integrated low-voltage relief valve by structural limitations, and the boundary dimension of this valve is comparatively large, is not easy to install.
Model utility content
The technical problems to be solved in the utility model is to provide a kind of energy consumption is low, pressure regulation spectrum is wide, easy for installation back pressure valve group and has the underground carry scraper work system of this kind of back pressure valve group.
This practical a kind of Novel back pressure valve group, comprise shuttle valve, first control port and second control port of described shuttle valve are respectively connected a hydraulic control guide oil circuit, the oil outlet of shuttle valve connects the filler opening of reduction valve, the oil outlet of reduction valve connects the filler opening of damping plug, the oil outlet of damping plug connects the control mouth of the cartridge valve often opened, and cartridge valve also has filler opening and oil outlet.
The utility model underground carry scraper work system, comprise the oil hydraulic pump be connected with system fuel tank, oil hydraulic pump is actuator's fuel feeding, described actuator comprises the first operating valve and the second operating valve, first operating valve is all connected with the oil outlet of oil hydraulic pump with the pressure oil port of the second operating valve, first actuator port of the first operating valve is connected with rod chamber with the rodless cavity of dump cylinder respectively with the second actuator port, actuator port first and second actuator port of the second operating valve is connected with rod chamber with the rodless cavity of elevating ram respectively, first control port of the first operating valve, 3rd control port of the second control port and the second operating valve, 4th control port controls by pilot valve control group, wherein the first control port of the first operating valve and the second control port are respectively used to control discharging operation and receive bucket operation, 3rd control port of the second operating valve and the 4th control port are respectively used to control lifting operation and decline operation, first operating valve is all connected with the filler opening of cartridge valve in back pressure valve group with the return opening of the second operating valve, in back pressure valve group, the first control port of shuttle valve is connected with the first control port of the first operating valve with the 4th control port of the second operating valve respectively with the second control port, in back pressure valve group, the oil outlet of cartridge valve is connected with system fuel tank.
The utility model underground carry scraper work system, wherein said first operating valve and the second operating valve are hydraulic control three six-way transfer valves, first operating valve also has the first intermediate oil inlet mouth and the first middle oil outlet, second operating valve also has the second intermediate oil inlet mouth and the second middle oil outlet, wherein the first intermediate oil inlet mouth of the first operating valve is connected with the oil outlet of oil hydraulic pump, first middle oil outlet of the first operating valve is connected with the second intermediate oil inlet mouth of the second operating valve, and the second middle oil outlet of the second operating valve is connected with the filler opening of cartridge valve.
The utility model underground carry scraper work system, wherein said pilot valve control group comprises four pilot valves, the filler opening of four pilot valves is connected with guide's fuel tank, return opening is connected with the filler opening of cartridge valve, and the actuator port of four pilot valves is respectively connected with in the 4th control port with the 3rd control port of the second control port, the second operating valve with the first control port of the first operating valve.
The utility model underground carry scraper work system, is provided with inlet oil filter between wherein said oil hydraulic pump and system fuel tank.
The utility model underground carry scraper work system, is connected with return filter between wherein said cartridge valve and system fuel tank.
The utility model underground carry scraper work system, first actuator port of wherein said first operating valve, the second actuator port, the first actuator port of the second operating valve, the second actuator port are respectively connected with the filler opening of a Fill valve, and the oil outlet of each Fill valve is all connected with the filler opening of cartridge valve.
The utility model underground carry scraper work system, is provided with safety valve between the oil outlet of wherein said oil hydraulic pump and the filler opening of cartridge valve, and the oil outlet of oil hydraulic pump is connected with the filler opening of safety valve, and the oil outlet of safety valve is connected with the filler opening of cartridge valve.
The utility model underground carry scraper work system, wherein said safety valve is relief valve.
The utility model a kind of back pressure valve group and the underground carry scraper work system difference from prior art with this back pressure valve group are that a kind of back pressure valve of the utility model group is the controlled back pressure valve group of operating conditions, controlled by guide's oil circuit when needs, and open completely at other time, decrease the unnecessary pressure loss and energy consumption.Because the operating conditions of back pressure valve group is controlled, therefore need not consider that other operating modes are as heating problem during comfortable property, therefore can to reach 1.5MPa even higher for the back pressure on system oil return road, and the setting pressure of conventional back pressures valve is generally lower than 0.5MPa, substantially increases the logical oily flow of Fill valve.This novel back pressure valve block structure is simple, can be installed to any position in multi-way valve return opening or system fuel tank loop, avoids the installation inconvenience that special multi-way valve causes because volume is excessive.The work system being provided with the underground carry scraper of this Novel back pressure valve group well solves the cavitation erosion problem during underground carry scraper discharging rotating forward operation mechanism, and without the need to changing on a large scale existing hydraulic system way to cycle oil, be easy to realize, be applicable to promoting the use of.
Below in conjunction with accompanying drawing, a kind of back pressure valve group of the present utility model and the underground carry scraper work system with this back pressure valve group are described further.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the utility model underground carry scraper work system;
Fig. 2 is the principle schematic of a kind of back pressure valve group of the utility model;
Fig. 3 is the principle schematic of hydraulic system in background technique;
Fig. 4 is the partial enlarged drawing of the first operating valve and the second operating valve in the utility model underground carry scraper work system.
Embodiment
As shown in Figure 1, the utility model underground carry scraper work system comprises the oil hydraulic pump 3 be connected with system fuel tank 1, is provided with inlet oil filter 2 between the filler opening of oil hydraulic pump 3 and system fuel tank 1, and oil hydraulic pump 3 is actuator 10 fuel feeding.Actuator 10 comprises the first operating valve 6 and the second operating valve 7.As shown in Figure 4, the first operating valve 6 and the second operating valve 7 are hydraulic control three six-way transfer valves.First operating valve 6 and the second operating valve 7 all have pressure oil port P1 and oil return inlet T 1, first operating valve 6 has the first intermediate oil inlet mouth E1, the first middle oil outlet F1, the first control port K1, the second control port K2, the first actuator port A1 and the second actuator port B1.Second operating valve 7 has the second intermediate oil inlet mouth E2, the second middle oil outlet F2, the first control port K3, the second control port K4, the first actuator port A2 and the second actuator port B2.First operating valve 6 is all connected with the oil outlet of oil hydraulic pump 3 with the pressure oil port P1 of the second operating valve 7.First actuator port A1 of the first operating valve 6 is connected with rod chamber with the rodless cavity of dump cylinder 8 respectively with the second actuator port B1, and dump cylinder 8 has discharging and receives bucket two kinds of working staties.First actuator port A2 of the second operating valve 7 is connected with rod chamber with the rodless cavity of elevating ram 9 respectively with the second actuator port B2, and elevating ram 9 has lifting and the two kinds of working staties that decline.First intermediate oil inlet mouth E1 of the first operating valve 6 is connected with the oil outlet of oil hydraulic pump 3, first middle oil outlet F1 of the first operating valve 6 is connected with the second intermediate oil inlet mouth E2 of the second operating valve 7, and the second middle oil outlet F2, first operating valve 6 of the second operating valve 7 are all connected with the filler opening A3 of the cartridge valve 15 often opened in back pressure valve group 14 with the oil return inlet T 1 of the second operating valve 7.As shown in Figure 2, back pressure valve group 14 also comprises shuttle valve 12.Shuttle valve 12 has oil outlet and the first control port X1 for being connected guide's oil circuit and the first control port X2.The oil outlet of shuttle valve 12 connects the filler opening of reduction valve 13.The oil outlet of reduction valve 13 connects the filler opening of damping plug 19.The oil outlet of damping plug 19 connects the control mouth of cartridge valve 15.As shown in Figure 1, cartridge valve 15 also has the oil outlet B3 be connected with system fuel tank 1, is connected with return filter 16 between the oil outlet B3 of cartridge valve 15 and system fuel tank 1.First control port X1 of shuttle valve 12 is connected with the first control port K1 of the first operating valve 6 with the second control port K4 of the second operating valve 7 respectively with the second control port X2.First control port K1, the second control port K2 of the first operating valve 6 and the first control port K3, the second control port K4 of the second operating valve 7 control by pilot valve control group 4, wherein the first control port K1 of the first operating valve 6 and the second control port K2 is respectively used to control discharging operation and receive bucket operation, and the first control port K3 of the second operating valve 7 and the second control port K4 is respectively used to control lifting operation and decline operation.Pilot valve control group 4 comprises four pilot valves 17, the filler opening of four pilot valves 17 is connected with guide's fuel tank, return opening is connected with the filler opening A3 of cartridge valve 15, and the actuator port of four pilot valves 17 is respectively connected with in the second control port K4 with the first control port K3 of the second control port K2, the second operating valve 7 with the first control port K1 of the first operating valve 6.First actuator port A1, the second actuator port B1 of the first operating valve 6, the first actuator port A2, the second actuator port B2 of the second operating valve 7 are respectively connected with the filler opening of a Fill valve 11, and the oil outlet of each Fill valve 11 is all connected with the filler opening A3 of cartridge valve 15.Be provided with safety valve 5 between the oil outlet of oil hydraulic pump 3 and the filler opening A3 of cartridge valve 15, the oil outlet of oil hydraulic pump 3 is connected with the filler opening of safety valve 5, and the oil outlet of safety valve 5 is connected with the filler opening A3 of cartridge valve 15.Safety valve 5 can select relief valve.
The working principle of a kind of back pressure valve of the utility model group is as follows: when the first control port X1 and the second control port X2 place all do not have the input of pilot pressure oil, free conducting between the filler opening A3 of cartridge valve 15 and oil outlet B3 mouth, the system that realizes circulates without back pressure, reduces unnecessary energy ezpenditure.When in the first control port X1 and the second control port X2, any place has oil pressure to input, pilot pressure oil enters the control chamber of cartridge valve 15 through reduction valve 13.The spring of cartridge valve 15 open in usual is set as 2.5bar herein.When the pilot pressure that pilot pressure oil produces is greater than 2.5bar, the spool of cartridge valve 15 is closed gradually, filler opening A3 place pressure increase, thus sets up return oil pressure.When setting pressure lower than reduction valve 13 of the pilot pressure at the first control port X1 or the second control port X2 place, the pressure at filler opening A3 place is that pilot pressure deducts 2.5bar, when exceeding the setting pressure of reduction valve 13, the pressure at filler opening A3 place is that the setting pressure of reduction valve 13 deducts 2.5bar.
The utility model underground carry scraper work system has following several operating mode:
1) during comfortable property, now four pilot valves 17 are all failure to actuate, input without pressure signal in back pressure valve group 14, back pressure valve is in normally open, pressure oil is through the meta oil duct of the first operating valve 6 and the second operating valve 7, enter the filler opening A3 of cartridge valve 15 in back pressure valve group 14, and freely flow back to system fuel tank 1 from the oil outlet B3 of cartridge valve 15.
2) during scraper bowl discharging, open the first control port K1 output pilot pressure oil of corresponding pilot valve 17 to the first operating valve 6, control the upper work of the first operating valve 6, the pressure oil port P1 of the second operating valve 7 and the first actuator port A1 conducting, oil return inlet T 1 and the first actuator port B1 conducting, the rodless cavity of the dump cylinder 8 that the first actuator port A1 that system pressure oil enters the second operating valve 7 is communicated with, realizes the discharging action of scraper bowl.Pilot pressure oil flows to the second control port X2 of shuttle valve 12 simultaneously, now the first control port X1 is without pressure oil, through shuttle valve 12 relatively after, export higher pilot pressure (i.e. the pressure of X2 mouth) to reduction valve 13, pilot pressure value in pipeline is reduced to desirable scope by reduction valve 13, this pilot pressure is applied to the side of cartridge valve 15 spool, overcomes the pressure of spring, makes spool be tending towards closing.System oil return enters the filler opening A3 of back pressure valve, needs to overcome the power that spool is closed and just can open spool and flow to oil outlet B3, the pressure increase of GuA3Kou, thus set up return oil pressure.Under gravity, the actual act time, dump cylinder 8 easily produces inhaled sky to scraper bowl discharge process much smaller than the calculation of hydraulic pressure time.The return oil pressure now set up can open Fill valve 11 corresponding to the first actuator port A1 of the first operating valve 6, makes part system oil return directly refill the rodless cavity of dump cylinder 8, improves emptying phenomenon.
3) during swing arm decline operating mode, open the second control port K4 output pilot pressure oil of corresponding pilot valve 17 to the second operating valve 7, control the bottom work of the second operating valve 7, the pressure oil port P1 of the second operating valve 7 and the second actuator port B2 conducting, oil return inlet T 1 and the first actuator port A1 conducting, the rodless cavity of the elevating ram 9 that the second actuator port B2 that system pressure oil enters the second operating valve 7 is communicated with, realizes the down maneuver of swing arm.Pilot pressure oil flows to the first control port X1 of shuttle valve 12 simultaneously, now the second control port X2 is without pressure oil, through shuttle valve 12 relatively after, export higher pilot pressure (i.e. the pressure of X1 mouth) to reduction valve 13, pilot pressure value in pipeline is reduced to desirable scope by reduction valve 13, this pilot pressure is applied to the side of cartridge valve 15 spool, overcomes the pressure of spring, makes spool be tending towards closing.System oil return enters the filler opening A3 of back pressure valve, needs to overcome the power that spool is closed and just can open spool and flow to oil outlet B3, the pressure increase of GuA3Kou, thus set up return oil pressure.Under gravity, the actual act time, elevating ram 9 easily produces inhaled sky to swing arm decline process much smaller than the calculation of hydraulic pressure time.The return oil pressure now set up can open Fill valve 11 corresponding to the second actuator port B2 of the second operating valve 7, makes part system oil return directly refill the rodless cavity of elevating ram 9, improves emptying phenomenon.
4), during moved arm lifting operating mode, open corresponding pilot valve 17 to the first control port K3 pressure oil output of the second operating valve 7, control the upper work of the second operating valve 7, realize the lifting action of swing arm.Now enter back pressure valve group 14 without pilot pressure oil, cartridge valve 15 is in opening state all the time, and the oil return of system enters the filler opening A3 of cartridge valve 15, and freely flows back to system fuel tank 1 from the oil outlet B3 of cartridge valve 15, realizes without back pressure oil return.
5) when bucket operating mode received by scraper bowl, open the second control port K2 pressure oil output of corresponding pilot valve 17 to the first operating valve 6, control the bottom work of the first operating valve 6, realize the receipts bucket action of scraper bowl.Now enter back pressure valve group 14 without pilot pressure oil, cartridge valve 15 is in opening state all the time, and the oil return of system enters the filler opening A3 of cartridge valve 15, and freely flows back to system fuel tank 1 from the oil outlet B3 of cartridge valve 15, realizes without back pressure oil return.
Above-described embodiment is described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that the utility model claims determine.
Claims (9)
1. a back pressure valve group, it is characterized in that: comprise shuttle valve, first control port (X1) of described shuttle valve is respectively connected a hydraulic control guide oil circuit with the second control port (X2), the oil outlet of shuttle valve connects the filler opening of reduction valve, the oil outlet of reduction valve connects the filler opening of damping plug, the oil outlet of damping plug connects the control mouth of the cartridge valve often opened, and cartridge valve also has filler opening (A3) and oil outlet (B3).
2. one kind has the underground carry scraper work system of back pressure valve group described in claim 1, it is characterized in that: comprise the oil hydraulic pump be connected with system fuel tank, oil hydraulic pump is actuator's fuel feeding, described actuator comprises the first operating valve and the second operating valve, first operating valve is all connected with the oil outlet of oil hydraulic pump with the pressure oil port (P1) of the second operating valve, first actuator port (A1) of the first operating valve is connected with rod chamber with the rodless cavity of dump cylinder respectively with the second actuator port (B1), the actuator port first (A2) of the second operating valve is connected with rod chamber with the rodless cavity of elevating ram respectively with the second actuator port (B2), first control port (K1) of the first operating valve, 3rd control port (K3) of the second control port (K2) and the second operating valve, 4th control port (K4) controls by pilot valve control group, wherein first control port (K1) of the first operating valve and the second control port (K2) are respectively used to control discharging operation and receive bucket operation, 3rd control port (K3) of the second operating valve and the 4th control port (K4) are respectively used to control lifting operation and decline operation, first operating valve is all connected with the filler opening (A3) of cartridge valve in back pressure valve group with the return opening (T1) of the second operating valve, in back pressure valve group, first control port (X1) of shuttle valve is connected with first control port (K1) of the first operating valve with the 4th control port (K4) of the second operating valve respectively with the second control port (X2), in back pressure valve group, the oil outlet (B3) of cartridge valve is connected with system fuel tank.
3. a kind of underground carry scraper work system according to claim 2, it is characterized in that: described first operating valve and the second operating valve are hydraulic control three six-way transfer valves, first operating valve also has the first intermediate oil inlet mouth (E1) and the first middle oil outlet (F1), second operating valve also has the second intermediate oil inlet mouth (E2) and the second middle oil outlet (F2), wherein the first intermediate oil inlet mouth (E1) of the first operating valve is connected with the oil outlet of oil hydraulic pump, first middle oil outlet (F1) of the first operating valve is connected with the second intermediate oil inlet mouth (E2) of the second operating valve, second middle oil outlet (F2) of the second operating valve is connected with the filler opening (A3) of cartridge valve.
4. a kind of underground carry scraper work system according to claim 2, it is characterized in that: described pilot valve control group comprises four pilot valves, the filler opening of four pilot valves is connected with guide's fuel tank, return opening is connected with the filler opening (A3) of cartridge valve, and the actuator port of four pilot valves is respectively connected with in the 4th control port (K4) with the 3rd control port (K3) of the second control port (K2), the second operating valve with first control port (K1) of the first operating valve.
5. a kind of underground carry scraper work system according to claim 2, is characterized in that: be provided with inlet oil filter between described oil hydraulic pump and system fuel tank.
6. a kind of underground carry scraper work system according to claim 2, is characterized in that: be connected with return filter between described cartridge valve and system fuel tank.
7. a kind of underground carry scraper work system according to claim 2, it is characterized in that: first actuator port (A1) of described first operating valve, the second actuator port (B1), first actuator port (A2) of the second operating valve, the second actuator port (B2) are respectively connected with the filler opening of a Fill valve, and the oil outlet of each Fill valve is all connected with the filler opening (A3) of cartridge valve.
8. a kind of underground carry scraper work system according to claim 2, it is characterized in that: between the oil outlet of described oil hydraulic pump and the filler opening (A3) of cartridge valve, safety valve is installed, the oil outlet of oil hydraulic pump is connected with the filler opening of safety valve, and the oil outlet of safety valve is connected with the filler opening (A3) of cartridge valve.
9. a kind of underground carry scraper work system according to claim 8, is characterized in that: described safety valve is relief valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520605563.3U CN205025846U (en) | 2015-08-12 | 2015-08-12 | Backpressure valves and have underground scraper work systems of this backpressure valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520605563.3U CN205025846U (en) | 2015-08-12 | 2015-08-12 | Backpressure valves and have underground scraper work systems of this backpressure valves |
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| Publication Number | Publication Date |
|---|---|
| CN205025846U true CN205025846U (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520605563.3U Expired - Fee Related CN205025846U (en) | 2015-08-12 | 2015-08-12 | Backpressure valves and have underground scraper work systems of this backpressure valves |
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| CN (1) | CN205025846U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032122A (en) * | 2020-09-17 | 2020-12-04 | 哈尔滨工业大学（威海） | Hydraulic control system and excavator with same |
| CN112983909A (en) * | 2019-12-13 | 2021-06-18 | 山河智能装备股份有限公司 | Movable arm hydraulic system |
| EP4153869A4 (en) * | 2020-05-22 | 2024-01-24 | Volvo Constr Equip Ab | Hydraulic machine |
-
2015
- 2015-08-12 CN CN201520605563.3U patent/CN205025846U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983909A (en) * | 2019-12-13 | 2021-06-18 | 山河智能装备股份有限公司 | Movable arm hydraulic system |
| EP4153869A4 (en) * | 2020-05-22 | 2024-01-24 | Volvo Constr Equip Ab | Hydraulic machine |
| CN112032122A (en) * | 2020-09-17 | 2020-12-04 | 哈尔滨工业大学（威海） | Hydraulic control system and excavator with same |
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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: 20160210 Termination date: 20200812 |
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| CF01 | Termination of patent right due to non-payment of annual fee |