CN107725504B - Hydraulic system capable of providing proper performance for load and hydraulic control method - Google Patents
Hydraulic system capable of providing proper performance for load and hydraulic control method Download PDFInfo
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- CN107725504B CN107725504B CN201710861246.1A CN201710861246A CN107725504B CN 107725504 B CN107725504 B CN 107725504B CN 201710861246 A CN201710861246 A CN 201710861246A CN 107725504 B CN107725504 B CN 107725504B
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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)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a hydraulic system and a hydraulic control method capable of providing proper performance for a load, wherein the hydraulic system comprises a working valve of industrial machinery or engineering machinery, and the working valve is connected with an actuating mechanism; further comprising: at least one first hydraulic pump configured to supply pressure oil to the work valve; at least one second hydraulic pump configured to supply pressure oil to a working valve when a working oil pressure of the working valve is less than a set value; and the control valve is used for controlling whether the second hydraulic pump supplies oil to the working valve or not, and is connected to an oil way between an oil outlet of the second hydraulic pump and an oil inlet of the working valve. The invention can provide proper hydraulic performance for actual load, can meet the performance requirements of the forklift under high-load working condition and low-load working condition, and can effectively utilize the power of the engine.
Description
Technical Field
The present invention relates to a hydraulic system, and more particularly, to a hydraulic system and a hydraulic control method that can provide appropriate performance to a load.
Background
When the forklift lifts the goods, the hydraulic pump supplies oil to the working valve of the forklift, and the working valve then outputs the oil to the lifting oil cylinder. The hydraulic pump is driven by the engine, the pump displacement design of the hydraulic pump is greatly limited by the output torque of the engine, and the pump displacement of the hydraulic pump is not too high in consideration of the maximum load working condition of the lifting of the forklift. However, under the working condition of low load (light goods), the lifting speed of the goods is still slow due to the limited pump displacement of the hydraulic pump, so that the working efficiency cannot be improved, and the actual use requirement is not met. Although the above problems can be improved by using a variable displacement pump, the variable displacement pump has a complicated structure and is relatively high in cost.
Disclosure of Invention
The invention provides a hydraulic system and a hydraulic control method capable of providing proper performance for a load, and solves the problem that the displacement of a hydraulic pump of a forklift in the prior art cannot meet the working conditions of high load and low load.
The technical scheme adopted by the invention for solving the technical problems is as follows: a hydraulic system capable of providing proper performance for a load comprises a working valve of an industrial machine or a construction machine, wherein an actuator is connected with the working valve; further comprising:
at least one first hydraulic pump configured to supply pressure oil to the work valve;
at least one second hydraulic pump configured to supply pressure oil to a working valve when a working oil pressure of the working valve is less than a set value;
and the control valve is used for controlling whether the second hydraulic pump supplies oil to the working valve or not, and is connected to an oil way between an oil outlet of the second hydraulic pump and an oil inlet of the working valve.
Furthermore, the control valve is a cartridge valve, an oil inlet of the control valve is communicated with an oil outlet of the second hydraulic pump, an oil outlet of the control valve is communicated with the working valve, and an oil return port of the control valve is communicated with an oil tank of the industrial machinery or the engineering machinery.
Further, an oil outlet of the first hydraulic pump and an oil outlet of the control valve are connected with an oil inlet of the working valve through a first hydraulic pipeline.
Furthermore, a high-pressure filter is arranged on the first hydraulic pipeline, and/or an oil return pipeline is connected between the first hydraulic pipeline and an oil tank of the industrial machine or the engineering machine, and an overflow valve is connected to the oil return pipeline.
Further, the first hydraulic pump and the second hydraulic pump are driven by the same engine.
Further, the first hydraulic pump and the second hydraulic pump are separated from each other, or the first hydraulic pump and the second hydraulic pump are connected in parallel to form a multi-connection pump.
Furthermore, the industrial machinery or the engineering machinery is a forklift or a crane, and the actuating mechanism is a lifting oil cylinder.
The invention also provides a hydraulic control method capable of providing proper performance for a load, which is used for industrial machinery or engineering machinery, at least one first hydraulic pump and at least one second hydraulic pump are provided, the first hydraulic pump is used as a main oil supply pump of a working valve of the industrial machinery or the engineering machinery, and when the working oil pressure of the working valve of the industrial machinery or the engineering machinery is less than a set value, the first hydraulic pump and the second hydraulic pump jointly provide pressure oil for the working valve.
Furthermore, a control valve is connected to an oil path between an oil outlet of the second hydraulic pump and an oil inlet of the working valve, and the control valve controls whether the second hydraulic pump supplies oil to the working valve or not.
Furthermore, the control valve is a cartridge valve, an oil inlet of the control valve is communicated with an oil outlet of the second hydraulic pump, an oil outlet of the control valve is communicated with the working valve, and an oil return port of the control valve is communicated with an oil tank of the industrial machinery or the engineering machinery.
Compared with the prior art, the invention has the following beneficial effects:
1. the design of the first hydraulic pump and the second hydraulic pump utilizes the first hydraulic pump as a main oil supply pump of the working valve (the first hydraulic pump can provide hydraulic oil for the working valve as long as the working valve has flow requirements), and when the working oil pressure of the working valve is less than a set value, the first hydraulic pump and the second hydraulic pump jointly provide pressure oil for the working valve, so that the hydraulic system can provide proper hydraulic performance for actual load, can meet the performance requirements of high-load working conditions of the forklift, can meet the performance requirements of low-load working conditions, and can effectively utilize the power of an engine. In addition, compared with a mode of adopting a variable pump, the variable pump has the advantages of simpler structure and lower cost.
2. The control valve is arranged to facilitate oil supply of the second hydraulic pump to the working valve, and particularly, the control valve is realized by the cartridge valve, so that whether the second hydraulic pump supplies oil to the working valve can be automatically controlled according to the working oil pressure of the working valve, an auxiliary control module is not required to be introduced, and the cartridge valve can adjust the control pressure according to actual needs, so that the hydraulic control system is very convenient and fast.
The invention is further explained in detail with the accompanying drawings and the embodiments; however, a hydraulic system and a hydraulic control method that can provide a load with appropriate performance are not limited to the embodiments of the present invention.
Drawings
FIG. 1 is a schematic diagram of the hydraulic circuit of the present invention under high load conditions;
FIG. 2 is a schematic diagram of the hydraulic circuit of the present invention during low load conditions.
Detailed Description
Referring to fig. 1 and 2, a hydraulic system for providing proper performance to a load according to the present invention includes a work valve 4 of an industrial or construction machine, and an actuator for controlling a load lifting is connected to the work valve 4. In this embodiment, the industrial machine or the engineering machine refers to a forklift, and the actuating mechanism is a lift cylinder 5.
The invention also comprises a first hydraulic pump 2, a second hydraulic pump 8 and a control valve, wherein the first hydraulic pump 2 is used as a main oil supply pump of the working valve 4, and once the working valve 4 has flow demand, pressure oil is provided for the working valve 4; the second hydraulic pump 8 is configured to supply pressure oil to the working valves 4 when the working oil pressure of the working valves 4 is less than a set value. The control valve is used for controlling whether the second hydraulic pump 8 supplies oil to the working valve 4 or not, and is connected to an oil path between an oil outlet of the second hydraulic pump 8 and an oil inlet of the working valve 4.
In this embodiment, the control valve is specifically a cartridge valve 7, an oil inlet of the control valve is communicated with an oil outlet of the second hydraulic pump 8, an oil outlet of the control valve is communicated with the working valve 4, and an oil return port of the control valve is communicated with an oil tank 1 of the forklift. The oil outlet of the cartridge valve 7 and the oil outlet of the first hydraulic pump 2 are connected with the oil inlet of the working valve 4 through a first hydraulic pipeline 10, namely the oil outlet of the cartridge valve 7 and the oil outlet of the first hydraulic pump 2 are connected with one end of the first hydraulic pipeline 10 through a three-way joint, and the other end of the first hydraulic pipeline 10 is connected with the oil inlet of the working valve 4.
In this embodiment, a high-pressure filter 3 is arranged on the first hydraulic pipeline 10, an oil return pipeline 11 is connected between the first hydraulic pipeline 10 and the oil tank 1 of the forklift, and an overflow valve 6 is connected to the oil return pipeline 11. The oil return port of the cartridge valve 7 and the oil return port of the working valve 4 are also communicated with the oil tank 1 of the forklift through the oil return pipeline 11. The return oil pipeline 11 is provided with a return oil filter 9.
In the present embodiment, the first hydraulic pump 2 and the second hydraulic pump 8 are driven by the same engine, and the first hydraulic pump 2 and the second hydraulic pump 8 are separate from each other. In addition, the first hydraulic pump 2 and the second hydraulic pump 8 may be connected in parallel to form a dual pump. The number of the first hydraulic pump 2 and the second hydraulic pump 8 is not limited to one, and when the sum of the number of the first hydraulic pump 2 and the second hydraulic pump 8 is more than three, the first hydraulic pump 2 and the second hydraulic pump 8 can also be connected in parallel to form a triple pump, a quadruple pump and the like.
When the forklift is in a high-load working condition, the working oil pressure of the working valve 4 is higher (greater than or equal to the set value), so that the oil pressure ratio of the first hydraulic pump 2 is higher, and the pressure oil of the first hydraulic pump 2 flows to the lifting oil cylinder 5 through the high-pressure filter 3 and the working valve 4. The valve element 7a in the cartridge valve 7 is in the position shown in fig. 1 under high oil pressure, so that the hydraulic oil of the second hydraulic pump 8 flows directly through the cartridge valve 7 and the return oil filter 9 back to the tank 11 of the forklift. Under the working condition, the hydraulic oil of the second hydraulic pump 8 is in a low-pressure state, and according to a formula T ═ v, delta p)/(20 pi) (T: the torque requirement of the hydraulic pump; v: the displacement of the hydraulic pump; and delta p: the pressure difference of the inlet and the outlet of the hydraulic pump), the torque requirement of the second hydraulic pump 8 is lower, and therefore the load of the engine is reduced.
When the forklift is in a low-load working condition, the working oil pressure of the working valve 4 is relatively low (smaller than the set value), at this time, the oil pressure of the first hydraulic pump 2 is relatively low, and the valve element 7a in the cartridge valve 7 is in the position shown in fig. 2 under the action of the internal spring thereof. The outlet of the second hydraulic pump 8 opens into the first hydraulic line 10 via the non-return valve 7b of the cartridge valve 7, so that the first hydraulic pump 2 and the second hydraulic pump 8 together supply hydraulic oil to the working valves 4. Because the working oil pressure is not high at this time, the torque requirements of the first hydraulic pump 2 and the second hydraulic pump 8 are not high, and excessive load can not be caused on the engine. If the rotating speeds of the first hydraulic pump 2 and the second hydraulic pump 8 are consistent, the displacement of the first hydraulic pump 2 is four times that of the second hydraulic pump 8, so that the lifting speed in the low-load working condition is at least improved by 25% compared with the high-load working condition, and the working efficiency is greatly improved.
The invention can adjust the control pressure of the valve core 7a of the cartridge valve 7 according to the actual use working condition, thereby reasonably and effectively utilizing the power of the engine. For example: the control pressure of the valve core 7a of the cartridge valve 7 is set to 100bar, and when the working oil pressure of the hydraulic system is less than 100bar, the second hydraulic pump 8 and the first hydraulic pump 2 are in a communication state, and can jointly provide hydraulic oil for the working valve 4, so that the forklift is in a high-performance state.
The hydraulic system of the invention can provide proper performance for loads, and can be applied to other industrial machines or engineering machines besides a forklift, such as a crane and the like.
The invention relates to a hydraulic control method capable of providing proper performance for a load, which is used for industrial machinery or engineering machinery and is provided with at least one first hydraulic pump and at least one second hydraulic pump, wherein the first hydraulic pump is used as a main oil supply pump of a working valve of the industrial machinery or the engineering machinery, and the first hydraulic pump can provide pressure oil for the working valve no matter under a high-load working condition or a low-load working condition or other working conditions as long as the working valve has a flow demand; when the working oil pressure of a working valve of the industrial machine or the engineering machine is smaller than a set value (namely, in a low-load working condition), the first hydraulic pump and the second hydraulic pump jointly provide pressure oil for the working valve.
In this embodiment, a control valve is connected to an oil path between the oil outlet of the second hydraulic pump and the oil inlet of the working valve, and the control valve controls whether the second hydraulic pump supplies oil to the working valve. The control valve is a cartridge valve, an oil inlet of the control valve is communicated with an oil outlet of the second hydraulic pump, an oil outlet of the control valve is communicated with the working valve, and an oil return port of the control valve is communicated with an oil tank of industrial machinery or engineering machinery.
A hydraulic control method of the present invention that can provide a load with appropriate performance can be implemented using a hydraulic system that can provide a load with appropriate performance as described in the above embodiments.
In other embodiments, the control valve is a solenoid valve, the solenoid valve is connected with a control module for opening and closing a controller, the control module may include a control circuit board and a sensor for detecting the working oil pressure of the hydraulic system, and the output of the sensor is connected to the control circuit board.
The above embodiments are merely provided to further illustrate a hydraulic system and a hydraulic control method for providing a load with appropriate performance according to the present invention, but the present invention is not limited to the embodiments, and any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention fall within the scope of the technical solution of the present invention.
Claims (6)
1. A hydraulic system capable of providing proper performance for load comprises a working valve of a construction machine, an actuating mechanism is connected with the working valve; it is characterized by also comprising:
at least one first hydraulic pump configured to supply pressure oil to the work valve;
at least one second hydraulic pump configured to supply pressure oil to a working valve when a working oil pressure of the working valve is less than a set value;
the control valve is used for controlling whether the second hydraulic pump supplies oil to the working valve or not, and is connected to an oil way between an oil outlet of the second hydraulic pump and an oil inlet of the working valve;
the control valve is a cartridge valve, an oil inlet of the control valve is communicated with an oil outlet of the second hydraulic pump, an oil outlet of the control valve and an oil outlet of the first hydraulic pump are connected with an oil inlet of the working valve through a first hydraulic pipeline, and an oil return port of the control valve is communicated with an oil tank of the engineering machinery;
when the engineering machinery is in a high-load working condition, the working oil pressure of the working valve is greater than or equal to the set value, the valve core in the cartridge valve is positioned at a position for opening the oil return opening under the action of high oil pressure, so that the hydraulic oil of the second hydraulic pump directly flows back to the oil tank through the cartridge valve and the oil return filter, and the hydraulic oil of the second hydraulic pump is in a low-pressure state at the moment; when the engineering machinery is in a low-load working condition, the working oil pressure of the working valve is smaller than the set value, a valve core in the cartridge valve is in a position for closing an oil return opening under the action of a spring in the cartridge valve, an oil outlet of the second hydraulic pump leads to the first hydraulic pipeline through a check valve and an oil outlet of the cartridge valve, and the first hydraulic pump and the second hydraulic pump jointly provide hydraulic oil for the working valve.
2. The hydraulic system as claimed in claim 1, which is adapted to provide suitable performance to a load, characterized by: the first hydraulic pipeline is provided with a high-pressure filter, and/or an oil return pipeline is connected between the first hydraulic pipeline and an oil tank of the engineering machinery, and an overflow valve is connected to the oil return pipeline.
3. The hydraulic system as claimed in claim 1, which is adapted to provide suitable performance to a load, characterized by: the first hydraulic pump and the second hydraulic pump are driven by the same engine.
4. The hydraulic system as claimed in claim 1, which is adapted to provide suitable performance to a load, characterized by: the first hydraulic pump and the second hydraulic pump are separated from each other, or the first hydraulic pump and the second hydraulic pump are connected in parallel to form a multi-connected pump.
5. The hydraulic system as claimed in claim 1, which is adapted to provide suitable performance to a load, characterized by: the engineering machinery is a forklift or a crane, and the actuating mechanism is a lifting oil cylinder.
6. A hydraulic control method for a construction machine, which can provide a load with appropriate performance, is characterized in that: providing at least one first hydraulic pump and at least one second hydraulic pump, wherein the first hydraulic pump is used as a main oil supply pump of a working valve of the engineering machinery, and when the working oil pressure of the working valve of the engineering machinery is less than a set value, the first hydraulic pump and the second hydraulic pump jointly provide pressure oil for the working valve;
a control valve is connected on an oil path between an oil outlet of the second hydraulic pump and an oil inlet of the working valve, and the control valve controls whether the second hydraulic pump supplies oil to the working valve or not;
the control valve is a cartridge valve, an oil inlet of the control valve is communicated with an oil outlet of the second hydraulic pump, an oil outlet of the control valve is communicated with the working valve, and an oil return port of the control valve and an oil outlet of the first hydraulic pump are connected with an oil inlet of the working valve through a first hydraulic pipeline;
when the engineering machinery is in a high-load working condition, the working oil pressure of the working valve is greater than or equal to the set value, the valve core in the cartridge valve is positioned at a position for opening the oil return opening under the action of high oil pressure, so that the hydraulic oil of the second hydraulic pump directly flows back to the oil tank through the cartridge valve and the oil return filter, and the hydraulic oil of the second hydraulic pump is in a low-pressure state at the moment; when the engineering machinery is in a low-load working condition, the working oil pressure of the working valve is smaller than the set value, a valve core in the cartridge valve is in a position for closing an oil return opening under the action of a spring in the cartridge valve, an oil outlet of the second hydraulic pump leads to the first hydraulic pipeline through a check valve and an oil outlet of the cartridge valve, and the first hydraulic pump and the second hydraulic pump jointly provide hydraulic oil for the working valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710861246.1A CN107725504B (en) | 2017-09-21 | 2017-09-21 | Hydraulic system capable of providing proper performance for load and hydraulic control method |
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| CN201710861246.1A CN107725504B (en) | 2017-09-21 | 2017-09-21 | Hydraulic system capable of providing proper performance for load and hydraulic control method |
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| CN107725504B true CN107725504B (en) | 2020-03-06 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110953197B (en) * | 2019-12-23 | 2021-03-19 | 中联重科股份有限公司 | Power control hydraulic system and crane |
| CN112499528B (en) * | 2020-11-05 | 2022-05-03 | 鸿程电子工业(南通)有限公司 | Hydraulic system for lifting oil cylinder of forklift |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2586563B2 (en) * | 1988-04-06 | 1997-03-05 | 株式会社豊田自動織機製作所 | 2-speed lift mechanism for industrial vehicles |
| KR20110127343A (en) * | 2010-05-19 | 2011-11-25 | 두산산업차량 주식회사 | Lift speed control system of a working device for a heavy equipment |
| CN102295250B (en) * | 2011-08-30 | 2014-02-12 | 昆山航天智能技术有限公司 | Dual pump converging energy-saving control system for hydraulic system of forklift truck |
| CN105084261B (en) * | 2015-08-13 | 2017-09-22 | 安徽合力股份有限公司 | Dual-pump flow-converging 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 |
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