CN114715818B - Separate type electro-hydraulic driven forklift potential energy recovery system and separate type electro-hydraulic driven forklift - Google Patents
Separate type electro-hydraulic driven forklift potential energy recovery system and separate type electro-hydraulic driven forklift Download PDFInfo
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- CN114715818B CN114715818B CN202210444042.9A CN202210444042A CN114715818B CN 114715818 B CN114715818 B CN 114715818B CN 202210444042 A CN202210444042 A CN 202210444042A CN 114715818 B CN114715818 B CN 114715818B
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- 238000011084 recovery Methods 0.000 title claims abstract description 73
- 238000005381 potential energy Methods 0.000 title claims abstract description 33
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 145
- 239000003921 oil Substances 0.000 claims abstract description 114
- 238000004064 recycling Methods 0.000 claims description 15
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 229910001416 lithium ion Inorganic materials 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000009471 action Effects 0.000 description 18
- 230000001105 regulatory effect Effects 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000013589 supplement Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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- 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
- B66F9/24—Electrical devices or systems
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- 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
- B66F9/07504—Accessories, e.g. for towing, charging, locking
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- 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
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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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
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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
- 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
Abstract
The invention provides a split electrohydraulic driven forklift potential energy recovery system which comprises a lifting oil way, an inclined oil way, a hydraulic driving and energy recovery assembly and an electric driving and energy recovery assembly, wherein the lifting oil way is connected with the inclined oil way; the lifting oil circuit comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, the first hydraulic oil cylinder and the second hydraulic oil cylinder are suitable for being communicated with fork members of a forklift, the electric driving and energy recovery assembly is communicated with the hydraulic oil tank, the lifting oil circuit and the inclined oil circuit, the hydraulic driving and energy recovery assembly is communicated with the lifting oil circuit and the inclined oil circuit, and the inclined oil circuit comprises the inclined hydraulic oil cylinder suitable for being communicated with the fork members. The invention also provides a split electrohydraulic driven forklift, through the arrangement, the potential energy after lifting can be effectively recovered, and the service life of the forklift is prolonged.
Description
Technical Field
The invention relates to the technical field of electric forklift hydraulic systems, in particular to a split type electro-hydraulic driven forklift potential energy recovery system and a split type electro-hydraulic driven forklift.
Background
With the rising of the economy in China, logistics is already a large industry in China, and has been greatly developed. The logistics is integrated with modern transportation, storage, preservation, transportation, packaging, product circulation and logistics information, and the forklift is rapidly developed as engineering machinery for transportation and transportation. However, the traditional engineering machinery is always free from labels such as noise, exhaust emission, high energy consumption and the like, and the electric forklift technology is mature gradually, so that good news is brought to people in the aspects of reducing emission and improving environmental problems.
When the existing electric forklift finishes lifting, tilting and steering actions in the working process, potential energy is converted, the potential energy is consumed at a throttle valve port by a traditional hydraulic system, but a large amount of energy is lost, so that the temperature of the hydraulic system is increased, the stability of the hydraulic system in operation is further affected, the problems of oil leakage, noise, vibration and the like are generated, the reliability of a forklift system and the whole machine is affected, and the service life of the hydraulic system is shortened. Therefore, energy recovery is needed for potential energy, and the currently adopted potential energy recovery and energy saving technology mainly comprises the following modes: firstly, hydraulic energy is recovered by directly storing hydraulic oil in an oil return cavity of a lifting oil cylinder by adopting a hydraulic energy accumulator, but the speed of the oil cylinder can be changed along with pressure change in the hydraulic energy accumulator, so that the operability is reduced; secondly, the potential energy of the lifting weight is converted into electric energy by adopting an electric/power generation-pump/motor mode and stored in a power battery to realize electric energy recovery, but when the electric/power generation-pump/motor mode is used, the electric energy, the mechanical energy and the hydraulic energy are required to be converted for a plurality of times, the energy loss is increased in the energy conversion process, and when the lifting system is used for electric energy recovery, the tilting system cannot normally operate; and thirdly, the tilting and steering system is independent by adopting an electric cylinder to replace a hydraulic cylinder, but the price of the electric cylinder is far higher than that of the hydraulic cylinder, and the production cost is very high. Therefore, the prior art still cannot well recover potential energy of the forklift.
Disclosure of Invention
The invention discloses a potential energy recovery system of a split electro-hydraulic driven forklift and the split electro-hydraulic driven forklift, which are simple in structure and convenient to operate, and aim to solve the problems.
The invention adopts the following scheme: a potential energy recovery system of a split electrohydraulic driven forklift comprises a lifting oil way, an inclined oil way, a hydraulic driving and energy recovery assembly and an electric driving and energy recovery assembly; wherein, the liquid crystal display device comprises a liquid crystal display device,
the lifting oil way comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, and the first hydraulic oil cylinder and the second hydraulic oil cylinder are suitable for being connected with a fork piece of a forklift and driving the fork piece to move up and down;
the electric driving and energy recycling component is connected with the hydraulic oil tank, the lifting oil way and the inclined oil way and is used for inputting and recycling hydraulic oil to the lifting oil way and the inclined oil way;
the hydraulic driving and energy recovery assembly and the electric driving and energy recovery assembly are arranged in parallel and are also connected with the lifting oil way and the inclined oil way, and the hydraulic driving and energy recovery assembly is used for inputting and recovering hydraulic oil to the lifting oil way and the inclined oil way;
the inclined oil circuit comprises an inclined hydraulic oil cylinder which is suitable for being connected with the fork piece, and the inclined oil circuit is configured to be matched with the first hydraulic oil cylinder and the second hydraulic oil cylinder of the lifting oil circuit to jointly control the movement of the fork piece.
Further, the electric driving and energy recovering assembly comprises a motor-generator, a hydraulic pump-motor, a motor controller and a power supply system; wherein the motor-generator and the hydraulic pump-motor are coaxially arranged, the generator and the motor form an electric energy recovery assembly, and the motor and the hydraulic pump form an electric driving assembly; the motor-generator is electrically connected with the motor controller, and the motor controller is connected with the power supply system through CAN communication.
Further, the power supply system comprises a pre-charge controller, a BMS battery management system and a high-voltage lithium ion battery which are arranged in series.
Further, the lifting oil way further comprises a speed limiting valve, a first two-position two-way electromagnetic valve, a first one-way valve and a hydraulic oil tank; the oil outlet of the hydraulic oil tank is communicated with the inlet of the first one-way valve, the outlet of the first one-way valve is communicated with the inlet of the hydraulic pump-motor, the outlet of the hydraulic pump-motor is communicated with the inlet of the first two-position two-way electromagnetic valve, the outlet of the first two-position two-way electromagnetic valve is communicated with the inlet of the speed limiting valve, the outlet of the speed limiting valve is communicated with rodless cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder, and rod cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder are communicated with the oil return opening of the hydraulic oil tank.
Further, the speed limiting valve comprises a second one-way valve, a pressure reducing valve and a throttle valve, and the second one-way valve is connected with the pressure reducing valve in parallel through a pipeline; the speed limiting valve is configured to: when the hydraulic oil of the lifting oil way rises, the hydraulic oil is transmitted to rodless cavities of the first hydraulic oil cylinder and the second lifting hydraulic oil cylinder through the second one-way valve, and when the lifting oil way descends, the hydraulic oil is transmitted to the first two-position two-way electromagnetic valve through the pressure reducing valve and the throttle valve.
Further, the inclined oil way comprises a second two-position two-way electromagnetic valve, a three-position four-way valve, an inclined hydraulic oil cylinder and a hydraulic oil tank; the hydraulic oil tank is characterized in that the inlet of the second two-position two-way electromagnetic valve is communicated with a first bypass interface led out by a pipeline between the outlet of the hydraulic pump-motor and the inlet of the first two-position two-way electromagnetic valve, the outlet of the second two-position two-way electromagnetic valve is communicated with a first interface of the three-position four-way valve, a second interface of the three-position four-way valve is communicated with a rod cavity of the inclined hydraulic oil cylinder, a rodless cavity of the inclined hydraulic oil cylinder is communicated with a third interface of the three-position four-way valve, and a fourth interface of the three-position four-way valve is communicated with an oil return port of the hydraulic oil tank.
Further, the hydraulic driving and energy recovering assembly comprises a third one-way valve, a third two-position two-way electromagnetic valve, a hydraulic accumulator and a fourth two-position two-way electromagnetic valve; the third one-way valve inlet is communicated with a second bypass interface led out by a pipeline between the second two-position two-way electromagnetic valve outlet and the first interface of the three-position four-way valve, the third one-way valve outlet is communicated with the third two-position two-way electromagnetic valve inlet, the third two-position two-way electromagnetic valve outlet is communicated with the hydraulic accumulator, the fourth two-position two-way electromagnetic valve inlet is communicated with a third bypass interface led out by a pipeline between the third one-way valve outlet and the third two-position two-way electromagnetic valve inlet, and the fourth two-position two-way electromagnetic valve outlet is communicated with a fourth bypass interface led out by a pipeline between the first one-way valve outlet and the hydraulic pump-motor inlet.
Further, a first overflow valve is arranged in the lifting oil way, an inlet of the first overflow valve is communicated with a fifth bypass interface led out by a pipeline between the hydraulic pump-motor outlet and the first bypass interface, and an outlet of the first overflow valve is communicated with an oil return port of the hydraulic oil tank; the hydraulic driving and recycling assembly is internally provided with a second overflow valve, the inlet of the second overflow valve is communicated with a sixth bypass interface led out by a pipeline between the outlet of the third two-position two-way electromagnetic valve and the inlet of the hydraulic accumulator, and the outlet of the second overflow valve is communicated with an oil return port of the hydraulic oil tank.
Further, the lifting oil path is arranged in parallel with the inclined oil path.
The invention also provides a split type electrohydraulic driven forklift, which comprises a forklift, and further comprises any one of the split type electrohydraulic driven forklift potential energy recovery system, wherein the push rods of the first hydraulic rod oil cylinder, the second hydraulic oil cylinder and the inclined hydraulic oil cylinder of the split type electrohydraulic driven forklift potential energy recovery system are connected with the forklift and are configured to drive the forklift to move up and down and rotate in an inclined manner.
By adopting the technical scheme, the invention can obtain the following technical effects: on the basis that an electric driving and potential energy recovery integrated energy-saving system is realized by the motor-generator and the hydraulic pump-motor together, an energy-saving technology of hydraulic driving and energy recovery is realized by introducing a hydraulic accumulator, so that the energy recovery capacity of the hydraulic system of the electric forklift is further improved; the two-position two-way electromagnetic valve is utilized to separate oil ways under each working condition, and the hydraulic oil is definitely conveyed to corresponding execution parts, so that the loss of oil energy on the oil ways is reduced. Meanwhile, when the hydraulic accumulator is supplied with oil so that the lifting system can recover potential energy, the tilting system can have enough hydraulic oil supply to realize compound action; the electro-hydraulic compound drive and the energy recovery overcome the defects of large oil energy loss, high temperature rise and the like of the traditional electric forklift hydraulic system, solve the problem that an inclined system cannot operate in the electric energy recovery process, improve the operability of the electric forklift and the stability of the hydraulic system, further realize the electrodynamic and intelligent performance of the traditional forklift and meet the requirements of energy conservation and emission reduction of China.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a split electro-hydraulic driven forklift potential energy recovery system of a split electro-hydraulic driven forklift in an embodiment of the invention;
icon: lifting oil path E, tilting oil path F, hydraulic driving and energy recovery component C, electric driving and energy recovery component D, hydraulic oil tank 1, first check valve 2, power supply system 3, motor controller 4, motor-generator 5, hydraulic pump-motor 6, first overflow valve 7, first two-position two-way solenoid valve 8, speed limiting valve 9, first hydraulic cylinder 10, second hydraulic cylinder 11, second two-position two-way solenoid valve 12, three-position four-way valve 13, tilting hydraulic cylinder 14, third check valve 15, third two-position two-way solenoid valve 16, second overflow valve 17, hydraulic accumulator 18, fourth two-position two-way solenoid valve 19.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Examples
With reference to fig. 1, the embodiment provides a split electro-hydraulic driven forklift, which comprises a forklift and further comprises a split electro-hydraulic driven forklift potential energy recovery system, wherein push rods of a first hydraulic cylinder 10, a second hydraulic cylinder 11 and a tilting hydraulic cylinder 14 of the split electro-hydraulic driven forklift potential energy recovery system are connected with the forklift and are configured to drive the forklift to move up and down and tilt. The split electrohydraulic driven forklift potential energy recovery system comprises a lifting oil way E, an inclined oil way F, a hydraulic driving and energy recovery assembly C and an electric driving and energy recovery assembly D; the lifting oil way E comprises a first hydraulic oil cylinder 10 and a second hydraulic oil cylinder 11, wherein the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 are suitable for being connected with a fork piece of a forklift and driving the fork piece to move up and down; the electric driving and energy recycling component D is connected with the hydraulic oil tank 1, the lifting oil way E and the inclined oil way F and is used for conveying hydraulic oil in the hydraulic oil tank 1 to the lifting oil way E, driving the hydraulic oil cylinder to move and recycling the hydraulic oil; the hydraulic driving and energy recovering assembly C is connected with the lifting oil way E and the inclined oil way F and is used for driving the lifting oil way E and the inclined oil way F and recovering hydraulic oil; the inclined oil path F includes an inclined hydraulic cylinder 14 adapted to be connected to the fork, and is configured to cooperate with the lifting oil path E to control movement of the fork.
In this embodiment, the hydraulic cylinder includes a rod cavity and a rodless cavity, and when hydraulic oil is input into the rodless cavity, the push rod of the hydraulic cylinder can be pushed to move upwards. The lifting oil way E and the inclined oil way F are arranged in parallel, so that the lifting oil way E and the inclined oil way F can simultaneously control the inclined lifting of the fork piece, and can also independently and respectively control the lifting or inclined movement.
In the present embodiment, the electric driving and energy recovering assembly D includes a motor-generator 5, a hydraulic pump-motor 6, a motor controller 4, a power supply system 3; wherein the motor controller 4 is M/GCU, the motor-generator 5 and the hydraulic pump-motor 6 are coaxially arranged, the generator and the motor form an electric energy recovery assembly, and the motor and the hydraulic pump form an electric driving assembly; the motor-generator 5 is electrically connected with the motor controller, and the motor controller 4 is connected with a power supply system through CAN communication. The power supply system 3 comprises a pre-charge controller, a BMS battery management system and a high-voltage lithium ion battery which are arranged in series. Here, the motor-generator 5 and the hydraulic pump-motor 6 are coupled together, respectively.
The lifting oil way E also comprises a speed limiting valve 9, a first two-position two-way electromagnetic valve 8, a first one-way valve 2 and a hydraulic oil tank 1; the oil outlet of the hydraulic oil tank 1 is communicated with the inlet of the first one-way valve 2, the outlet of the first one-way valve 2 is communicated with the inlet of the hydraulic pump-motor 6, the outlet of the hydraulic pump-motor 6 is communicated with the inlet of the first two-position two-way electromagnetic valve 8, the outlet of the first two-position two-way electromagnetic valve 8 is communicated with the inlet of the speed limiting valve 9, the outlet of the speed limiting valve 9 is communicated with rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11, and the rod cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 are communicated with the oil return opening of the hydraulic oil tank 1.
The speed limiting valve 9 comprises a second one-way valve, a pressure reducing valve and a throttle valve, and the second one-way valve is connected with the pressure reducing valve in parallel through a pipeline; the speed limiting valve 9 is configured to: when the hydraulic oil in the lifting oil way E rises, the hydraulic oil is transmitted to rodless cavities of the first hydraulic oil cylinder 10 and the second lifting hydraulic oil cylinder through the second one-way valve, and when the lifting oil way E descends, the hydraulic oil is transmitted to the first two-position two-way electromagnetic valve 8 through the pressure reducing valve and the throttle valve. The speed limiting valve is used for controlling the speed of hydraulic oil, so that the speed of the fork piece can be controlled.
The inclined oil way F comprises a second two-position two-way electromagnetic valve 12, a three-position four-way valve 13, an inclined hydraulic oil cylinder 14 and a hydraulic oil tank 1; the inlet of the second two-position two-way electromagnetic valve 12 is communicated with a first bypass interface led out by a pipeline between the outlet of the hydraulic pump-motor 6 and the inlet of the first two-position two-way electromagnetic valve 8, the outlet of the second two-position two-way electromagnetic valve 12 is communicated with a first interface P of the three-position four-way valve 13, a second interface A of the three-position four-way valve 13 is communicated with a rod cavity of the inclined hydraulic cylinder 14, a rodless cavity of the inclined hydraulic cylinder 14 is communicated with a third interface B of the three-position four-way valve 13, and a fourth interface T of the three-position four-way valve 13 is communicated with an oil return port of the hydraulic oil tank 1.
The hydraulic driving and energy recovering assembly C comprises a third one-way valve 15, a third two-position two-way electromagnetic valve 16, a hydraulic accumulator 18 and a fourth two-position two-way electromagnetic valve 19; the inlet of the third one-way valve 15 is communicated with a second bypass interface led out by a pipeline between the outlet of the second two-position two-way electromagnetic valve 12 and the first interface of the three-position four-way valve 13, the outlet of the third one-way valve 15 is communicated with the inlet of the third two-position two-way electromagnetic valve 16, the outlet of the third two-position two-way electromagnetic valve 16 is communicated with the hydraulic accumulator 18, the inlet of the fourth two-position two-way electromagnetic valve 19 is communicated with a third bypass interface led out by a pipeline between the outlet of the third one-way valve 15 and the inlet of the third two-position two-way electromagnetic valve 16, and the outlet of the fourth two-position two-way electromagnetic valve 19 is communicated with a fourth bypass interface led out by a pipeline between the outlet of the first one-way valve 2 and the inlet of the hydraulic pump-motor 6.
A first overflow valve 7 is arranged in the lifting oil way E, an inlet of the first overflow valve 7 is communicated with a fifth bypass interface led out by a pipeline between an outlet of the hydraulic pump-motor 6 and the first bypass interface, and an outlet of the first overflow valve 7 is communicated with an oil return port of the hydraulic oil tank 1; the hydraulic driving and recycling assembly is internally provided with a second overflow valve 17, the inlet of the second overflow valve 17 is communicated with a sixth bypass interface led out by a pipeline between the outlet of the third two-position two-way electromagnetic valve 16 and the inlet of the hydraulic accumulator 18, and the outlet of the second overflow valve 17 is communicated with the oil return port of the hydraulic oil tank 1.
The working principle of the invention is as follows:
1. when the electric forklift lifts independently:
1. when the load of the lifting system rises:
(1) The hydraulic accumulator 18 is in a non-pressurized state, no matter in idle, light or heavy load, at which time the hydraulic drive and energy recovery assembly C is not able to supply oil, and is driven solely by the electric drive and energy recovery assembly D. The first two-position two-way solenoid valve 8 is in a right-position on state. Hydraulic oil is transmitted from the hydraulic oil tank 1 to the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 through the first one-way valve 2, the hydraulic pump-motor 6, the first two-position two-way electromagnetic valve 8 and the speed limiting valve 9 to complete lifting.
(2) The hydraulic accumulator 18 is in a pressurized state, whether empty, light or heavy.
a. The lifting speed meets the requirement, and the hydraulic driving and energy recovery assembly C is independently driven at the moment. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. Hydraulic oil is transmitted from the hydraulic accumulator 18 to the rodless cavities of the first hydraulic cylinder 10 and the second hydraulic cylinder 11 through the third two-position two-way electromagnetic valve 16, the fourth two-position two-way electromagnetic valve 19, the hydraulic pump-motor 6, the first two-position two-way electromagnetic valve 8 and the speed limiting valve 9 to complete lifting action.
b. The lifting speed does not meet the requirement, and the electric driving and energy recovery device D and the hydraulic driving and energy recovery device C are driven in a combined mode. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. Hydraulic oil is transmitted from the hydraulic accumulator 18 to the rodless cavities of the first hydraulic cylinder 10 and the second hydraulic cylinder 11 through the third two-position two-way electromagnetic valve 16, the fourth two-position two-way electromagnetic valve 19, the hydraulic pump-motor 6, the first two-position two-way electromagnetic valve 8 and the speed limiting valve 9 to complete lifting action. The motor-generator 5 compensates with the change of the lifting speed, drives the hydraulic pump-motor 6 to realize the regulation of the lifting speed, and supplements oil supply.
2. When the load of the lifting system is reduced:
(1) The hydraulic accumulator 18 is in an unpressurized state, whether empty, light or heavy, at which time energy is recovered solely by the hydraulic drive and energy recovery assembly C. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. The hydraulic oil in the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 is transmitted to the hydraulic accumulator 18 for recycling through the speed limiting valve 9, the first two-position two-way electromagnetic valve 8, the hydraulic pump-motor 6, the fourth two-position two-way electromagnetic valve 19 and the third two-position two-way electromagnetic valve 16.
(2) The hydraulic accumulator 18 is in a pressurized state.
a. And when the load is heavy, the electric driving and energy recovery D and the hydraulic driving and energy recovery component C are compounded to perform energy recovery. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. The hydraulic oil in the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 is transmitted to the hydraulic accumulator 18 for recycling through the speed limiting valve 9, the first two-position two-way electromagnetic valve 8, the hydraulic pump-motor 6, the fourth two-position two-way electromagnetic valve 19 and the third two-position two-way electromagnetic valve 16. The hydraulic pump-motor 6 drives the motor-generator 5 to reverse rotation for partial potential energy recovery.
b. And under no load and light load, the hydraulic driving and energy recovering assembly C separately recovers energy. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. The hydraulic oil in the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 is transmitted to the hydraulic accumulator 18 for recycling through the speed limiting valve 9, the first two-position two-way electromagnetic valve 8, the hydraulic pump-motor 6, the fourth two-position two-way electromagnetic valve 19 and the third two-position two-way electromagnetic valve 16. The regulation of the descent speed is now effected by the motor-generator 5.
2. When the electric forklift is independently inclined:
1. the hydraulic accumulator 18 is in a non-pressurized state, no matter in idle, light or heavy load, at which time the hydraulic drive and energy recovery assembly C is not able to supply oil, and is driven solely by the electric drive and energy recovery assembly D. The second two-position two-way solenoid valve 12 is in an upper conduction state. Hydraulic oil is transmitted from the hydraulic oil tank 1 to the tilting hydraulic oil cylinder 14 through the first one-way valve 2, the hydraulic pump-motor 6, the second two-position two-way electromagnetic valve 12 and the three-position four-way valve 13 to complete tilting action. When the three-position four-way valve 13 tilts forward, the port P and the port B are connected to transmit oil to the rodless cavity of the tilting hydraulic cylinder 14, and the port T and the port A are connected to transmit oil in the rod cavity of the tilting hydraulic cylinder 14 to the hydraulic oil tank 1; when the tilting device tilts backward, the port P is connected with the port A to transmit oil to the rod cavity of the tilting hydraulic oil cylinder 14, and the port T is connected with the port B to transmit the oil without the rod cavity of the tilting hydraulic oil cylinder 14 to the hydraulic oil tank 1.
2. The hydraulic accumulator 18 is in a pressurized state, whether empty, light or heavy, and is now driven solely by the hydraulic drive and energy recovery assembly C.
a. When the pressure at the inlet end of the third one-way valve 15 is greater than the pressure at the outlet end, the second two-position two-way electromagnetic valve 12 is in an upper conduction state, the third two-position two-way electromagnetic valve 16 is in a right conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper conduction state. Hydraulic oil is transmitted from the accumulator 18 to the tilting hydraulic cylinder 14 through the third two-position two-way electromagnetic valve 12, the fourth two-position two-way electromagnetic valve 19, the hydraulic pump-motor 6, the second two-position two-way electromagnetic valve 12 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated and controlled by the switching position of the three-position four-way valve 13.
b. When the pressure of the inlet end of the third one-way valve 15 is smaller than that of the outlet end, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state. Hydraulic oil is transmitted to the tilting hydraulic cylinder 14 from the accumulator 18 through the third two-position two-way electromagnetic valve 16, the third one-way valve 15 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated and controlled by the switching position of the three-position four-way valve 13.
3. When the electric forklift lifts and tilts, the operation is combined:
1. when the load of the lifting system rises:
(1) The hydraulic accumulator 18 is in a non-pressurized state, no matter in idle, light or heavy load, at which time the hydraulic drive and energy recovery assembly C is not able to supply oil, and is driven solely by the electric drive and energy recovery assembly D. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, and the second two-position two-way electromagnetic valve 12 is in an upper-position conduction state. Hydraulic oil is transmitted from the hydraulic oil tank 1 to the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 through the first one-way valve 2, the hydraulic pump-motor 6, the first two-position two-way electromagnetic valve 8 and the speed limiting valve 9 to finish lifting action; the bypass is transmitted to the tilting hydraulic cylinder 14 through the second two-position two-way electromagnetic valve 12 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated and controlled by the switching position of the three-position four-way valve 13.
(2) The hydraulic accumulator 18 is in a pressurized state, whether empty, light or heavy.
a. When the pressure at the inlet end of the third one-way valve 15 is greater than the pressure at the outlet end, the third one-way valve is driven by the electric driving and energy recovering assembly D and the hydraulic driving and energy recovering assembly C in a combined mode. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the second two-position two-way electromagnetic valve 12 is in an upper-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. Hydraulic oil is transmitted from the hydraulic accumulator 18 to the rodless cavities of the first hydraulic cylinder 10 and the second hydraulic cylinder 11 through the third two-position two-way electromagnetic valve 16, the fourth two-position two-way electromagnetic valve 19, the hydraulic pump-motor 6, the first two-position two-way electromagnetic valve 8 and the speed limiting valve 9 to complete lifting action. The bypass is transmitted to the tilting hydraulic cylinder 14 through the second two-position two-way electromagnetic valve 12 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated by the position switching of the three-position four-way valve 13, and at the moment, the motor-generator 5 realizes the regulation of the compound action speed and simultaneously supplements oil supply.
b. When the pressure at the inlet end of the third one-way valve 15 is smaller than the pressure at the outlet end, the third one-way valve is independently driven by the hydraulic driving and energy recovering assembly C. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. Hydraulic oil is transmitted from the hydraulic accumulator 18 to the tilting hydraulic cylinder 14 through the third two-position two-way electromagnetic valve 16, the third one-way valve 15 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated and controlled by the switching position of the three-position four-way valve 13. Hydraulic oil is transmitted from the hydraulic accumulator 18 to the rodless cavities of the first hydraulic cylinder 10 and the second hydraulic cylinder 11 through the third two-position two-way electromagnetic valve 16, the fourth two-position two-way electromagnetic valve 19, the hydraulic pump-motor 6, the first two-position two-way electromagnetic valve 8 and the speed limiting valve 9 to complete lifting action.
2. When the load of the lifting system is reduced:
(1) The hydraulic accumulator 18 is in an unpressurized state, whether empty, light or heavy, at which time energy is recovered solely by the hydraulic drive and energy recovery assembly C. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. The hydraulic oil in the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 is transmitted to the tilting hydraulic oil cylinder through the speed limiting valve 9, the first two-position two-way electromagnetic valve 8, the second two-position two-way electromagnetic valve 12 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated and controlled by the switching position of the three-position four-way valve 13. The surplus hydraulic oil is transmitted to the hydraulic accumulator 18 for recycling through the hydraulic pump-motor 6, the fourth two-position two-way electromagnetic valve 19 and the third two-position two-way electromagnetic valve 16.
(2) The hydraulic accumulator 18 is in a pressurized state, whether empty, light or heavy.
a. When the pressure at the inlet end of the third one-way valve 15 is greater than the pressure at the outlet end, the hydraulic driving and energy recovering assembly C independently recovers energy. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the second two-position two-way electromagnetic valve 12 is in an upper-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. The hydraulic oil in the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 is transmitted to the tilting hydraulic oil cylinder through the speed limiting valve 9, the first two-position two-way electromagnetic valve 8, the second two-position two-way electromagnetic valve 12 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated and controlled by the switching position of the three-position four-way valve 13. The surplus hydraulic oil is transmitted to the hydraulic accumulator 18 for recycling through the hydraulic pump-motor 6, the fourth two-position two-way electromagnetic valve 19 and the third two-position two-way electromagnetic valve 16.
b. When the pressure at the inlet end of the third one-way valve 15 is smaller than the pressure at the outlet end, the energy is recovered by the hydraulic driving and energy recovering assembly C alone. The first two-position two-way electromagnetic valve 8 is in a right-position conduction state, the third two-position two-way electromagnetic valve 16 is in a right-position conduction state, and the fourth two-position two-way electromagnetic valve 19 is in an upper-position conduction state. The hydraulic oil in the rodless cavities of the first hydraulic oil cylinder 10 and the second hydraulic oil cylinder 11 is transmitted to the tilting hydraulic oil cylinder through the speed limiting valve 9, the first two-position two-way electromagnetic valve 8, the hydraulic pump-motor 6, the fourth two-position two-way electromagnetic valve 19, the third one-way valve 15 and the three-position four-way valve 13 to complete tilting action. The forward tilting or backward tilting is regulated and controlled by the switching position of the three-position four-way valve 13. The surplus hydraulic oil is transmitted to the hydraulic accumulator 18 for recycling through the third two-position two-way electromagnetic valve 16.
According to the invention, on the basis that the electric driving and potential energy recovery integrated energy-saving system is realized by the motor-generator 5 and the hydraulic pump-motor 6 together, the energy-saving technology of hydraulic driving and energy recovery is realized by introducing the hydraulic accumulator 18, so that the energy recovery capacity of the hydraulic system of the electric forklift is further improved; the two-position two-way electromagnetic valve is utilized to separate oil ways under each working condition, and the hydraulic oil is definitely conveyed to corresponding execution parts, so that the loss of oil energy on the oil ways is reduced. Meanwhile, when the hydraulic accumulator 18 supplements oil supply to enable the lifting system to recover potential energy, the tilting system can have enough hydraulic oil supply to realize compound action; the electro-hydraulic compound drive and the energy recovery overcome the defects of large oil energy loss, high temperature rise and the like of the traditional electric forklift hydraulic system, solve the problem that an inclined system cannot operate in the electric energy recovery process, improve the operability of the electric forklift and the stability of the hydraulic system, further realize the electrodynamic and intelligent performance of the traditional forklift and meet the requirements of energy conservation and emission reduction of China.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention.
Claims (8)
1. The potential energy recovery system of the split electrohydraulic driven forklift is characterized by comprising a lifting oil way, an inclined oil way, a hydraulic driving and energy recovery assembly and an electric driving and energy recovery assembly; wherein, the liquid crystal display device comprises a liquid crystal display device,
the lifting oil way comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, and the first hydraulic oil cylinder and the second hydraulic oil cylinder are suitable for being connected with a fork piece of a forklift and driving the fork piece to move up and down;
the electric driving and energy recycling component is connected with the hydraulic oil tank, the lifting oil way and the inclined oil way and is used for inputting and recycling hydraulic oil to the lifting oil way and the inclined oil way;
the hydraulic driving and energy recovery assembly and the electric driving and energy recovery assembly are arranged in parallel and are also connected with the lifting oil way and the inclined oil way, and the hydraulic driving and energy recovery assembly is used for inputting and recovering hydraulic oil to the lifting oil way and the inclined oil way;
the inclined oil circuit comprises an inclined hydraulic oil cylinder which is suitable for being connected with the fork piece, and the inclined oil circuit is configured to be matched with the first hydraulic oil cylinder and the second hydraulic oil cylinder of the lifting oil circuit to jointly control the movement of the fork piece; the electric driving and energy recovering assembly comprises a motor-generator, a hydraulic pump-motor, a motor controller and a power supply system; wherein the motor-generator and the hydraulic pump-motor are coaxially arranged, the generator and the motor form an electric energy recovery assembly, and the motor and the hydraulic pump form an electric driving assembly; the motor-generator is electrically connected with the motor controller, and the motor controller is connected with the power supply system through CAN communication;
the lifting oil way further comprises a speed limiting valve, a first two-position two-way electromagnetic valve, a first one-way valve and a hydraulic oil tank; the oil outlet of the hydraulic oil tank is communicated with the inlet of the first one-way valve, the outlet of the first one-way valve is communicated with the inlet of the hydraulic pump-motor, the outlet of the hydraulic pump-motor is communicated with the inlet of the first two-position two-way electromagnetic valve, the outlet of the first two-position two-way electromagnetic valve is communicated with the inlet of the speed limiting valve, the outlet of the speed limiting valve is communicated with rodless cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder, and rod cavities of the first hydraulic oil cylinder and the second hydraulic oil cylinder are communicated with the oil return opening of the hydraulic oil tank.
2. The split electro-hydraulic drive forklift potential energy recovery system of claim 1, wherein the power supply system comprises a pre-charge controller, a BMS battery management system, and a high voltage lithium ion battery arranged in series.
3. The split electro-hydraulic drive forklift potential energy recovery system of claim 1, wherein the speed limiting valve comprises a second one-way valve, a pressure reducing valve and a throttle valve, and the second one-way valve is arranged in parallel with the pressure reducing valve through a pipeline; the speed limiting valve is configured to: when the hydraulic oil of the lifting oil way rises, the hydraulic oil is transmitted to rodless cavities of the first hydraulic oil cylinder and the second lifting hydraulic oil cylinder through the second one-way valve, and when the lifting oil way descends, the hydraulic oil is transmitted to the first two-position two-way electromagnetic valve through the pressure reducing valve and the throttle valve.
4. The split electro-hydraulic drive forklift potential energy recovery system of claim 3, wherein the inclined oil path comprises a second two-position two-way electromagnetic valve, a three-position four-way valve, an inclined hydraulic cylinder and a hydraulic oil tank; the second two-position two-way electromagnetic valve inlet is communicated with a first bypass interface led out by a pipeline between the hydraulic-motor outlet and the first two-position two-way electromagnetic valve inlet, the second two-position two-way electromagnetic valve outlet is communicated with a first interface of the three-position four-way valve, a second interface of the three-position four-way valve is communicated with a rod cavity of the inclined hydraulic cylinder, a rodless cavity of the inclined hydraulic cylinder is communicated with a third interface of the three-position four-way valve, and a fourth interface of the three-position four-way valve is communicated with an oil return port of the hydraulic oil tank.
5. The split electro-hydraulic drive forklift potential energy recovery system of claim 4, wherein said hydraulic drive and energy recovery assembly comprises a third check valve, a third two-position two-way solenoid valve, a hydraulic accumulator, a fourth two-position two-way solenoid valve; the third one-way valve inlet is communicated with a second bypass interface led out by a pipeline between the second two-position two-way electromagnetic valve outlet and the first interface of the three-position four-way valve, the third one-way valve outlet is communicated with the third two-position two-way electromagnetic valve inlet, the third two-position two-way electromagnetic valve outlet is communicated with the hydraulic accumulator, the fourth two-position two-way electromagnetic valve inlet is communicated with a third bypass interface led out by a pipeline between the third one-way valve outlet and the third two-position two-way electromagnetic valve inlet, and the fourth two-position two-way electromagnetic valve outlet is communicated with a fourth bypass interface led out by a pipeline between the first one-way valve outlet and the hydraulic pump-motor inlet.
6. The split electro-hydraulic drive forklift potential energy recovery system of claim 5, wherein a first overflow valve is arranged in the lifting oil path, an inlet of the first overflow valve is communicated with a fifth bypass interface led out by a pipeline between the hydraulic pump-motor outlet and the first bypass interface, and an outlet of the first overflow valve is communicated with an oil return port of the hydraulic oil tank; the hydraulic driving and recycling assembly is internally provided with a second overflow valve, the inlet of the second overflow valve is communicated with a sixth bypass interface led out by a pipeline between the outlet of the third two-position two-way electromagnetic valve and the inlet of the hydraulic accumulator, and the outlet of the second overflow valve is communicated with an oil return port of the hydraulic oil tank.
7. The split electro-hydraulic drive forklift potential energy recovery system of claim 1, wherein said lifting oil circuit is disposed in parallel with said tilting oil circuit.
8. A split electro-hydraulic driven forklift comprising a fork member, and further comprising a split electro-hydraulic driven forklift potential energy recovery system as claimed in any one of claims 1 to 7, wherein the push rods of the first hydraulic ram cylinder, the second hydraulic ram cylinder and the tilting hydraulic ram cylinder of the split electro-hydraulic driven forklift potential energy recovery system are connected to the fork member and configured to drive the fork member to move up and down and tilt.
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| JP6496633B2 (en) * | 2015-08-04 | 2019-04-03 | 株式会社豊田自動織機 | Industrial vehicle |
| CN105236317A (en) * | 2015-11-12 | 2016-01-13 | 潍柴动力股份有限公司 | Electric fork-lift truck, potential energy recycling system and method thereof |
| CN107420384B (en) * | 2017-09-15 | 2019-04-30 | 太原理工大学 | System is used in the storage of lifting device gravitional force P-V |
| CN208980277U (en) * | 2018-10-17 | 2019-06-14 | 成都新一驱动科技有限责任公司 | Electri forklift jacking system energy recycle device |
| CN110374941B (en) * | 2019-01-09 | 2020-12-22 | 浙江大学 | Forklift potential energy recovery system self-adaptive to load weight and control method |
| CN113148914B (en) * | 2021-01-29 | 2023-12-29 | 华侨大学 | Forklift potential energy recovery and release integrated device and working method |
| CN113048104B (en) * | 2021-04-22 | 2022-07-15 | 贵州大学 | Energy recovery system of hydraulic load operation platform |
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Application publication date: 20220708 Assignee: FUJIAN SOUTHCHINA MACHINERY MANUFACTURE CO.,LTD. Assignor: HUAQIAO University Contract record no.: X2024980000374 Denomination of invention: The potential energy recovery system of split and compound electro-hydraulic drive forklifts and split and compound electro-hydraulic drive forklifts Granted publication date: 20230516 License type: Exclusive License Record date: 20240123 |