CN107725504A - A kind of hydraulic system and hydraulic control method that suitable performance is provided for load - Google Patents
A kind of hydraulic system and hydraulic control method that suitable performance is provided for load Download PDFInfo
- Publication number
- CN107725504A CN107725504A CN201710861246.1A CN201710861246A CN107725504A CN 107725504 A CN107725504 A CN 107725504A CN 201710861246 A CN201710861246 A CN 201710861246A CN 107725504 A CN107725504 A CN 107725504A
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- Prior art keywords
- oil
- hydraulic pump
- valve
- hydraulic
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Civil Engineering (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a kind of hydraulic system and hydraulic control method that suitable performance is provided for load, the hydraulic system includes industrial machinery or the operating valve of engineering machinery, the operating valve are connected with executing agency；Also include：At least one first hydraulic pump, it is configured as providing pressure oil to the operating valve；At least one second hydraulic pump, it is configured as providing pressure oil to the operating valve when the operating oil pressure of operating valve is less than setting value；Control valve, for control second hydraulic pump for operating valve fuel feeding whether, the control valve is connected on the oil circuit between the oil-out of second hydraulic pump and the oil inlet of operating valve.The present invention can provide suitable hydraulic performance for actual loading, can meet the performance requirement of fork truck high capacity operating mode, and can meets the performance requirement of low-load operating mode, and can effectively utilize the power of engine.
Description
Technical field
The present invention relates to a kind of hydraulic system, more particularly to it is a kind of for load provide suitable performance hydraulic system and
Hydraulic control method.
Background technology
It is its operating valve fuel feeding by hydraulic pump during forklift lifting goods, operating valve is fuel-displaced again to give lift cylinder.Hydraulic pump by
Engine driving, the pumpage of hydraulic pump, which designs, is largely limited to the outputting torsion of engine, and is carried in view of fork truck
The maximum load operating mode risen, the pumpage of hydraulic pump is often all without too high.But under low-load (goods is lighter) operating mode, due to
The pumpage of hydraulic pump is limited, causes the lifting speed of goods still slow, so as to improve operating efficiency, does not meet reality
Use demand.Although can improve above mentioned problem using variable pump, variable pump is complicated, and cost is higher.
The content of the invention
The invention provides a kind of hydraulic system and hydraulic control method that suitable performance is provided for load, which overcome
The problem of truck hydraulic pumpage of prior art can not only meet high capacity operating mode but also meet low-load operating mode.
The technical solution adopted for the present invention to solve the technical problems is：A kind of hydraulic pressure that suitable performance is provided for load
System, including industrial machinery or the operating valve of engineering machinery, the operating valve are connected with executing agency；Also include：
At least one first hydraulic pump, it is configured as providing pressure oil to the operating valve；
At least one second hydraulic pump, it is configured as carrying the operating valve when the operating oil pressure of operating valve is less than setting value
For pressure oil；
Control valve, for control second hydraulic pump for operating valve fuel feeding whether, the control valve is connected to described second
On oil circuit between the oil-out of hydraulic pump and the oil inlet of operating valve.
Further, the control valve is inserted valve, and its oil inlet connects the oil-out of second hydraulic pump, and its is fuel-displaced
Mouth connects the operating valve, and its oil return opening connects industrial machinery or the fuel tank of engineering machinery.
Further, the oil-out of first hydraulic pump connects institute with the oil-out of control valve by the first fluid pressure line
State the oil inlet of operating valve.
Further, be provided with high pressure filter on first fluid pressure line, and/or, first fluid pressure line with
Return line is connected between industrial machinery or the fuel tank of engineering machinery, overflow valve is connected with the return line.
Further, first hydraulic pump and the second hydraulic pump are by same engine driving.
Further, first hydraulic pump and the second hydraulic pump are separate, or, first hydraulic pump and second
Hydraulic pump composes in parallel multiplex pump.
Further, the industrial machinery or engineering machinery are fork truck or crane, and the executing agency is lift cylinder.
The present invention separately provides a kind of hydraulic control method that suitable performance is provided for load, for industrial machinery or engineering
Machinery, there is provided at least one first hydraulic pump and at least one second hydraulic pump, by the first hydraulic pump as industrial machinery or engineering machine
The main oil feed pump of the operating valve of tool, when the operating oil pressure of industrial machinery or the operating valve of engineering machinery is less than setting value, by
One hydraulic pump and the second hydraulic pump provide pressure oil for operating valve jointly.
Further, control is connected on the oil circuit between the oil-out of second hydraulic pump and the oil inlet of operating valve
Valve, from the control valve control the second hydraulic pump to operating valve fuel feeding whether.
Further, the control valve is inserted valve, and its oil inlet connects the oil-out of second hydraulic pump, and its is fuel-displaced
Mouth connects the operating valve, and its oil return opening connects industrial machinery or the fuel tank of engineering machinery.
Compared to prior art, the invention has the advantages that：
1st, the design of first hydraulic pump and the second hydraulic pump, the main oil feed pump of operating valve is used as by the use of the first hydraulic pump
(as long as operating valve has traffic demand, and the first hydraulic pump can provide hydraulic oil to operating valve), small in the operating oil pressure of operating valve
When setting value, pressure oil is provided jointly for operating valve by the first hydraulic pump and the second hydraulic pump so that the present invention can be actual
Load provides suitable hydraulic performance, can meet the performance requirement of fork truck high capacity operating mode, and and can meets low-load operating mode
Performance requirement, and can effectively utilize the power of engine.In addition, compared with using the pattern of variable pump, structure of the present invention is more
Add that simple, cost is lower.
2nd, the setting of the control valve, can be to control the second hydraulic pump to be whether operating valve fuel feeding provides facility, especially
, control valve is realized using inserted valve, and it is work that the second hydraulic pump can be controlled automatically according to the operating oil pressure size of operating valve
Whether make valve fuel feeding, without introducing secondary control module, and inserted valve can be according to adjustment control pressure be actually needed, very
It is convenient.
The present invention is described in further detail below in conjunction with drawings and Examples；But one kind of the present invention can carry for load
Embodiment is not limited to for the hydraulic system and hydraulic control method of suitable performance.
Brief description of the drawings
Fig. 1 is hydraulic circuit diagram of the present invention under high capacity operating mode；
Fig. 2 is hydraulic circuit diagram of the present invention under low-load operating mode.
Embodiment
Embodiment, refer to shown in Fig. 1, Fig. 2, a kind of hydraulic system that suitable performance is provided for load of the invention,
Including industrial machinery or the operating valve of engineering machinery 4, the operating valve 4 is connected with the executing agency for controlling freight lifting.This
In embodiment, the industrial machinery or engineering machinery fourchette car, the executing agency are lift cylinder 5.
Present invention additionally comprises one first hydraulic pump 2, one second hydraulic pump 8 and a control valve, the first hydraulic pump 2 is used as work
The main oil feed pump of valve 4, once operating valve 4 has traffic demand, as operating valve 4 provides pressure oil；Second hydraulic pump 8 is configured as
When the operating oil pressure of operating valve 4 is less than setting value pressure oil is provided to the operating valve 4.Control valve is used to control described second
Hydraulic pump 8 be the fuel feeding of operating valve 4 whether, the control valve is connected to the oil-out of second hydraulic pump 8 and the oil-feed of operating valve 4
On oil circuit between mouthful.
In the present embodiment, the control valve is specially inserted valve 7, and its oil inlet connects the fuel-displaced of second hydraulic pump 8
Mouthful, its oil-out connects the operating valve 4, and its oil return opening connects the fuel tank 1 of fork truck.The oil-out and first of the inserted valve 7
The oil-out of hydraulic pump 2 connects the oil inlet of the operating valve 4 by the first fluid pressure line 10, i.e., the oil-out of inserted valve 7 and
The oil-out of first hydraulic pump 2 by three-way connection connect the first fluid pressure line 10 one end, the first fluid pressure line 10 it is another
The oil inlet of end connection operating valve 4.
In the present embodiment, be provided with high pressure filter 3 on first fluid pressure line 10, first fluid pressure line 10 with
Return line 11 is connected between the fuel tank 1 of fork truck, overflow valve 6 is connected with the return line 11.The oil return of the inserted valve 7
Mouth connects the fuel tank 1 of fork truck with the oil return opening of operating valve 4 also by the return line 11.Oil return is provided with return line 11
Filter 9.
In the present embodiment, the hydraulic pump 8 of the first hydraulic pump 2 and second is by same engine driving, and the first hydraulic pressure
The hydraulic pump 8 of pump 2 and second is separate.Except this, the first hydraulic pump 2 and the second hydraulic pump 8 can also compose in parallel duplex pump.Institute
The quantity for stating the first hydraulic pump 2 and the second hydraulic pump 8 is not limited to one, and when the first hydraulic pump 2 and the second hydraulic pump 8
When quantity sum is more than three, the first hydraulic pump 2 and the second hydraulic pump 8 can also compose in parallel treble pump, four-in pump etc..
When fork truck is in high capacity operating mode, the operating oil pressure of operating valve 4 is higher (being more than or equal to the setting value),
Thus the oil pressure ratio of the first hydraulic pump 2 is higher, and the pressure oil of the first hydraulic pump 2 carries through high pressure filter 3 and the flow direction of operating valve 4
Oil-lifting jar 5.Valve element 7a in inserted valve 7 is in the position shown in Fig. 1 under the effect of high oil pressure, makes the hydraulic pressure of the second hydraulic pump 8
Oil directly flows back to the fuel tank 11 of fork truck by inserted valve 7 and return filter 9.The hydraulic oil of second hydraulic pump 8 under this operating mode
In low-pressure state, according to formula T=(v. Δs p)/(20 π) (T:The torque demand of hydraulic pump；v：The discharge capacity of hydraulic pump；Δp:
Hydraulic pump oil inlet and outlet pressure difference), now the torsion demand of the second hydraulic pump 8 is than relatively low, so as to reduce the load of engine.
When fork truck is in low-load operating mode, the operating oil pressure of operating valve 4 is than relatively low (being less than the setting value), and now
The oil pressure ratio of one hydraulic pump 2 is relatively low, and the valve element 7a in inserted valve 7 is in position as shown in Figure 2 in the presence of its contained spring
Put.The oil-out of second hydraulic pump 8 leads to the first fluid pressure line 10 by the non-return valve 7b of inserted valve 7, thus, the first hydraulic pump
2 and second hydraulic pump 8 jointly for operating valve 4 provide hydraulic coupling oil.Because now operating oil pressure is not high, the first hydraulic pump 2 and
The torsion demand of two hydraulic pumps 8 is not high, will not cause excessive loads to engine.If the first hydraulic pump 2 and the second hydraulic pump 8
Rotating speed it is consistent, the discharge capacity of the first hydraulic pump 2 is four times of the second hydraulic pump 8, then lifting speed ratio during low-load operating mode
High capacity operating mode at least improves 25%, so as to substantially increase operating efficiency.
The present invention can adjust the valve element 7a of inserted valve 7 control pressure according to actual use operating mode, so as to rationally have
Effect utilizes engine power.Such as：The valve element 7a of inserted valve 7 control pressure is set as 100bar, then when hydraulic system work
When making oil pressure and being less than 100bar, the second hydraulic pump 8 and the first hydraulic pump 2 are in connected state, can be provided jointly for operating valve 4
Hydraulic oil, fork truck is set to be in high performance state.
A kind of hydraulic system that suitable performance is provided for load of the present invention, except can apply in fork truck, may be used also
With applied to other industrial machineries or engineering machinery, such as applied to crane etc..
A kind of hydraulic control method that suitable performance is provided for load of the present invention, for industrial machinery or engineering machine
Tool, there is provided at least one first hydraulic pump and at least one second hydraulic pump, by the first hydraulic pump as industrial machinery or engineering machinery
Operating valve main oil feed pump, no matter high capacity operating mode or low-load operating mode or other operating modes, as long as operating valve have flow need
Ask, the first hydraulic pump can provide pressure oil to operating valve；It is small in the operating oil pressure of industrial machinery or the operating valve of engineering machinery
When setting value (i.e. in low-load operating mode), pressure oil is provided jointly for operating valve by the first hydraulic pump and the second hydraulic pump.
In the present embodiment, control is connected on the oil circuit between the oil-out of second hydraulic pump and the oil inlet of operating valve
Valve processed, from the control valve control the second hydraulic pump to operating valve fuel feeding whether.The control valve is specially inserted valve, its oil inlet
The oil-out of second hydraulic pump is connected, its oil-out connects the operating valve, and its oil return opening connects industrial machinery or engineering
The fuel tank of machinery.
A kind of hydraulic control method that suitable performance is provided for load of the present invention, can be used described in above-described embodiment
It is a kind of to provide the hydraulic system of suitable performance for load to realize.
In other embodiments, the control valve is magnetic valve, and the magnetic valve is connected with the control opened and closed for controller
Module, the control module can include the sensor of control board and the operating oil pressure for detecting hydraulic system, sensor
Output be connected to control board.
Above-described embodiment is only used for further illustrating a kind of hydraulic system that suitable performance is provided for load of the present invention
And hydraulic control method, but the invention is not limited in embodiment, every technical spirit according to the present invention is to above example
Any simple modification, equivalent change and modification made, each falls within the protection domain of technical solution of the present invention.
Claims (10)
1. a kind of hydraulic system that suitable performance is provided for load, including industrial machinery or the operating valve of engineering machinery, the work
Executing agency is connected with as valve；Characterized in that, also include：
At least one first hydraulic pump, it is configured as providing pressure oil to the operating valve；
At least one second hydraulic pump, it is configured as providing pressure to the operating valve when the operating oil pressure of operating valve is less than setting value
Power oil；
Control valve, for control second hydraulic pump for operating valve fuel feeding whether, the control valve is connected to second hydraulic pressure
On oil circuit between the oil-out of pump and the oil inlet of operating valve.
2. the hydraulic system according to claim 1 that suitable performance is provided for load, it is characterised in that：The control valve
For inserted valve, its oil inlet connects the oil-out of second hydraulic pump, and its oil-out connects the operating valve, and its oil return opening connects
The fuel tank of logical industrial machinery or engineering machinery.
3. the hydraulic system according to claim 1 or 2 that suitable performance is provided for load, it is characterised in that：Described
The oil-out of one hydraulic pump connects the oil inlet of the operating valve with the oil-out of control valve by the first fluid pressure line.
4. the hydraulic system according to claim 3 that suitable performance is provided for load, it is characterised in that：First liquid
High pressure filter is provided with pressure pipe road, and/or, between first fluid pressure line and industrial machinery or the fuel tank of engineering machinery
Return line is connected with, overflow valve is connected with the return line.
5. the hydraulic system according to claim 1 that suitable performance is provided for load, it is characterised in that：First liquid
Press pump and the second hydraulic pump are by same engine driving.
6. the hydraulic system according to claim 1 that suitable performance is provided for load, it is characterised in that：First liquid
Press pump and the second hydraulic pump are separate, or, first hydraulic pump and the second hydraulic pump compose in parallel multiplex pump.
7. the hydraulic system according to claim 1 that suitable performance is provided for load, it is characterised in that：The industrial machine
Tool or engineering machinery are fork truck or crane, and the executing agency is lift cylinder.
8. a kind of hydraulic control method that suitable performance is provided for load, for industrial machinery or engineering machinery, its feature exists
In：At least one first hydraulic pump and at least one second hydraulic pump are provided, by the first hydraulic pump as industrial machinery or engineering machinery
Operating valve main oil feed pump, when the operating oil pressure of industrial machinery or the operating valve of engineering machinery is less than setting value, by first
Hydraulic pump and the second hydraulic pump provide pressure oil for operating valve jointly.
9. the hydraulic control method according to claim 8 that suitable performance is provided for load, it is characterised in that：Described
Control valve is connected on oil circuit between the oil-out of second hydraulic pump and the oil inlet of operating valve, the second liquid is controlled by the control valve
Press pump to operating valve fuel feeding whether.
10. the hydraulic control method according to claim 8 that suitable performance is provided for load, it is characterised in that：It is described
Control valve is inserted valve, and its oil inlet connects the oil-out of second hydraulic pump, and its oil-out connects the operating valve, its time
Hydraulic fluid port connects industrial machinery or the fuel tank of engineering machinery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710861246.1A CN107725504B (en) | 2017-09-21 | 2017-09-21 | Hydraulic system capable of providing proper performance for load and hydraulic control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710861246.1A CN107725504B (en) | 2017-09-21 | 2017-09-21 | Hydraulic system capable of providing proper performance for load and hydraulic control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107725504A true CN107725504A (en) | 2018-02-23 |
| CN107725504B CN107725504B (en) | 2020-03-06 |
Family
ID=61206685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710861246.1A Active CN107725504B (en) | 2017-09-21 | 2017-09-21 | Hydraulic system capable of providing proper performance for load and hydraulic control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107725504B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110953197A (en) * | 2019-12-23 | 2020-04-03 | 中联重科股份有限公司 | Power control hydraulic system and crane |
| CN112499528A (en) * | 2020-11-05 | 2021-03-16 | 鸿程电子工业(南通)有限公司 | Hydraulic system for lifting oil cylinder of forklift |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01261503A (en) * | 1988-04-06 | 1989-10-18 | Toyota Autom Loom Works Ltd | Two speed lift mechanism for industrial vehicle |
| CN102295250A (en) * | 2011-08-30 | 2011-12-28 | 陈海波 | Dual pump converging energy-saving control system for hydraulic system of forklift truck |
| CN102917972A (en) * | 2010-05-19 | 2013-02-06 | 斗山工业用车辆株式会社 | Apparatus for controlling raise speed of working machine for heavy equipment |
| CN105084261A (en) * | 2015-08-13 | 2015-11-25 | 安徽合力股份有限公司 | Dual-pump confluent energy-saving type forklift hydraulic system |
| CN205136180U (en) * | 2015-11-13 | 2016-04-06 | 福建龙马环卫装备股份有限公司 | Hydraulic system of big indisputable fill compression dustbin compression material loading simultaneous working |
-
2017
- 2017-09-21 CN CN201710861246.1A patent/CN107725504B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01261503A (en) * | 1988-04-06 | 1989-10-18 | Toyota Autom Loom Works Ltd | Two speed lift mechanism for industrial vehicle |
| CN102917972A (en) * | 2010-05-19 | 2013-02-06 | 斗山工业用车辆株式会社 | Apparatus for controlling raise speed of working machine for heavy equipment |
| CN102295250A (en) * | 2011-08-30 | 2011-12-28 | 陈海波 | Dual pump converging energy-saving control system for hydraulic system of forklift truck |
| CN105084261A (en) * | 2015-08-13 | 2015-11-25 | 安徽合力股份有限公司 | Dual-pump confluent energy-saving type forklift hydraulic system |
| CN205136180U (en) * | 2015-11-13 | 2016-04-06 | 福建龙马环卫装备股份有限公司 | Hydraulic system of big indisputable fill compression dustbin compression material loading simultaneous working |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110953197A (en) * | 2019-12-23 | 2020-04-03 | 中联重科股份有限公司 | Power control hydraulic system and crane |
| CN110953197B (en) * | 2019-12-23 | 2021-03-19 | 中联重科股份有限公司 | Power control hydraulic system and crane |
| CN112499528A (en) * | 2020-11-05 | 2021-03-16 | 鸿程电子工业(南通)有限公司 | Hydraulic system for lifting oil cylinder of forklift |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107725504B (en) | 2020-03-06 |
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