CN113148914B - Forklift potential energy recovery and release integrated device and working method - Google Patents
Forklift potential energy recovery and release integrated device and working method Download PDFInfo
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- CN113148914B CN113148914B CN202110127810.3A CN202110127810A CN113148914B CN 113148914 B CN113148914 B CN 113148914B CN 202110127810 A CN202110127810 A CN 202110127810A CN 113148914 B CN113148914 B CN 113148914B
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- 238000011084 recovery Methods 0.000 title claims abstract description 43
- 238000005381 potential energy Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001502 supplementing effect Effects 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 63
- 238000011160 research Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- B66F9/22—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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
Abstract
The invention discloses a forklift potential energy recovery and release integrated device and a working method thereof, wherein the device integrates the recovery and release of gravitational potential energy, and realizes the recovery and release of energy through the same set of energy recovery and release units: in the process that the lifting oil cylinder drives the heavy object to be lowered, the hydraulic pump motor is used as a motor, the motor generator is used as a generator, pressure oil in the second rodless cavity of the lifting oil cylinder flows into the motor to push the motor to drive the generator to work, and output electric energy is stored in the storage battery; or the pressure oil in the second rodless cavity of the lifting oil cylinder flows into the first rodless cavity of the tilting oil cylinder to drive the tilting oil cylinder to act, so that the recovery of energy is completed. In the lifting process, the motor generator works in a motor state to draw electric energy from the storage battery, the hydraulic pump motor works in a hydraulic pump state to increase pressure oil for the system, the piston rod of the lifting oil cylinder or the piston rod of the tilting oil cylinder is pushed to extend out, and the lifting action is completed, and the lifting action is the energy release process.
Description
Technical Field
The invention relates to a forklift potential energy recovery and release integrated device and a working method thereof.
Background
Fork truck is a kind of wheeled transport vehicle that loads and unloads, stacks and short distance transportation operation to the goods of forming tray, and it is a commonly used lifting means, usually uses engine or motor drive, and its theory of operation is engine or motor drive hydraulic pump, produces hydraulic energy to lift the hydro-cylinder and convert hydraulic energy into the gravitational potential energy of goods.
The electric forklift takes a battery as energy, and uses a motor to replace an engine to drive a hydraulic system to work, so that the working processes of lifting, descending, transferring, unloading and the like of cargoes are completed. Because fork truck has contained a large amount of potential energy in the in-process that drives the heavy object decline, traditional fork truck has consumed this part energy on the throttle valve port, has caused a large amount of energy loss on the one hand, on the other hand also makes fluid temperature rise, influences the life-span of hydraulic component and fluid to probably cause leakage and unstable scheduling problem of work. At present, for the research of potential energy of a forklift, a part of the research adopts a hydraulic accumulator to store pressure oil of a heavy object which is discharged by a Cheng Ju lifting oil cylinder, but the pressure of the accumulator is gradually increased along with the increase of the recovered pressure oil, so that the operability is changed in the process of lowering the heavy object; another part of researches adopt an electric energy recovery mode, and adopt a set of independent hydraulic motor-generator connected with a rodless cavity of a lifting oil cylinder; when the lifting oil cylinder drives the heavy object to descend, hydraulic oil in a rodless cavity of the lifting oil cylinder flows into the hydraulic motor to drive the generator to generate electricity, and electric energy is stored in the battery. During lifting or other conditions, stored electrical energy is released. The working method has the advantages that the energy recovery system and the release system are two different systems, multiple energy conversion exists, the system is complex, and the efficiency is low. To simplify the system and improve the energy utilization efficiency, the integration of recovery and release is an important direction of research.
Disclosure of Invention
The invention provides a forklift potential energy recovery and release integrated device and a working method thereof, which overcome the defects existing in the background technology. One of the technical schemes adopted for solving the technical problems is as follows:
fork truck potential energy is retrieved and is released integrated device, and it includes: the tilting oil cylinder comprises a first rod cavity and a first rodless cavity, the three-position four-way electromagnetic reversing valve is connected with the first rod cavity, the first rodless cavity, the second two-position two-way electromagnetic reversing valve and the energy recovery and release unit, the energy recovery and release unit is connected with the motor controller, and the motor controller is connected with the storage battery; the lifting oil cylinder comprises a second rod cavity and a second rodless cavity, the second rodless cavity is connected with the first two-position two-way electromagnetic directional valve, the first two-position two-way electromagnetic directional valve is connected with the second two-position two-way electromagnetic directional valve and the energy recovery and release unit, and the second two-position two-way electromagnetic directional valve is connected with the energy recovery and release unit.
In a preferred embodiment: the energy recovery and release unit comprises a hydraulic pump motor, a motor generator and a first oil tank, wherein the hydraulic pump motor is connected with the motor generator, the three-position four-way electromagnetic reversing valve and the first oil tank, and the motor generator is connected with the motor controller.
In a preferred embodiment: the hydraulic pump motor is arranged coaxially with the motor generator.
In a preferred embodiment: the device also comprises a first one-way valve and a second one-way valve, wherein the inlet of the first one-way valve is connected with the hydraulic pump motor and the outlet of the second one-way valve, and the outlet of the first one-way valve is connected with the three-position four-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve; the inlet of the second one-way valve is connected with the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve, and the outlet of the second one-way valve is connected with the hydraulic pump motor.
In a preferred embodiment: the device also comprises a throttle valve connected between the first two-position two-way electromagnetic directional valve and the inlet of the second one-way valve.
In a preferred embodiment: the device also comprises an overflow valve and a second oil tank, wherein the inlet of the overflow valve is connected with the hydraulic pump motor, the inlet of the first one-way valve and the outlet of the second one-way valve, and the outlet of the overflow valve is connected with the second oil tank.
In a preferred embodiment: the device also comprises an oil supplementing one-way valve and a third oil tank, wherein the inlet of the oil supplementing one-way valve is connected with the third oil tank, and the outlet of the oil supplementing one-way valve is connected with the inlet of the overflow valve, the hydraulic pump motor and the inlet of the first one-way valve.
In a preferred embodiment: the two lifting cylinders are arranged, and the second rodless cavities of the two lifting cylinders are connected with the first two-position two-way electromagnetic directional valve.
The second technical scheme adopted by the invention for solving the technical problems is as follows:
the working method of the forklift potential energy recovery and release integration is characterized by comprising the following steps of:
the fork truck potential energy has two states when retrieving:
when the lifting oil cylinder is driven to drive a heavy object to descend, the three-position four-way electromagnetic directional valve is in a middle position, the tilting oil cylinder does not work, at the moment, the first two-position two-way electromagnetic directional valve is electrified, the second two-position two-way electromagnetic directional valve is not electrified, pressure oil in a second rodless cavity of the lifting oil cylinder flows into the hydraulic pump motor after passing through the first two-position two-way electromagnetic directional valve, the throttle valve and the second one-way valve, the hydraulic pump motor 11 is used as a motor, the motor generator is in a power generation state, and electric energy is stored in the storage battery through the motor controller; the pressure difference between two ends of the throttle valve can be regulated due to the existence of the hydraulic pump motor, so that the accurate control of the descending speed is realized;
or,
when the lifting oil cylinder is driven to drive a heavy object to move down, the left or right position of the three-position four-way electromagnetic directional valve works, the tilting oil cylinder is in a working state, the working pressure of the tilting oil cylinder is lower than the pressure of the second rodless cavity of the lifting oil cylinder, at the moment, the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are electrified, and pressure oil of the second rodless cavity of the lifting oil cylinder flows into the first rodless cavity of the tilting oil cylinder after passing through the left or right position of the first two-position two-way electromagnetic directional valve, the second two-position two-way electromagnetic directional valve and the three-position four-way electromagnetic directional valve, so that the tilting oil cylinder is driven to tilt forward and backward by the heavy object;
the energy release has two states:
when the lifting oil cylinder is driven to drive the fork to lift, the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are electrified, at the moment, the energy stored in the storage battery is supplied to the motor generator so as to enable the motor generator to be in a motor state, the hydraulic pump motor is used as a hydraulic pump, the hydraulic pump outputs pressure oil outwards, the pressure oil enters a second rodless cavity of the lifting oil cylinder through the first one-way valve, the second two-position two-way electromagnetic directional valve and the first two-position two-way electromagnetic directional valve, and the lifting oil cylinder is pushed to drive the fork to complete lifting action, so that recycling of the recovered energy is realized;
or,
when the tilting cylinder is driven to work and the lifting cylinder is not operated, the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are not electrified, the three-position four-way electromagnetic directional valve is electrified and is in left position or right position to work, at the moment, the energy stored in the storage battery is supplied to the motor generator so that the motor generator is in a motor state, the hydraulic pump motor is used as a hydraulic pump, the hydraulic pump outputs pressure oil to the outside, the pressure oil output by the hydraulic pump flows into a first rodless cavity of the tilting cylinder after passing through the first one-way valve and the three-position four-way electromagnetic directional valve, and the pressure oil is promoted to drive the fork to tilt forwards or tilt backwards, so that recycling of the recovered energy is realized.
Compared with the background technology, the technical proposal has the following advantages:
1. the device integrates the recovery and release of gravitational potential energy, and realizes the recovery and release of energy through the same set of energy recovery and release unit: in the process that the lifting oil cylinder drives the heavy object to be placed down, the hydraulic pump motor is used as a motor, the motor generator is used as a generator, pressure oil in the second rodless cavity of the lifting oil cylinder flows into the motor to push the motor to drive the generator to work, and output electric energy is stored in the storage battery to complete energy recovery. In the lifting process, the motor generator works in a motor state to draw electric energy from the storage battery, the hydraulic pump motor works in a hydraulic pump state to increase pressure oil for the system, the piston rod of the lifting oil cylinder is pushed to extend, and the lifting action is completed, and the lifting action is the energy release process.
2. In the aspect of energy release, on one hand, the lifting oil cylinder can be continuously pushed to work by releasing through the energy recovery and release unit; on the other hand, when the working pressure of the tilting cylinder is lower than the pressure of the second rodless cavity of the lifting cylinder, the pressure oil of the second rodless cavity of the lifting cylinder can directly flow into the tilting cylinder to push the tilting cylinder to complete related operation, and at the moment, the efficiency is higher because the pressure oil is directly utilized, and no energy conversion exists.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a block diagram showing the overall structure of a forklift potential energy recovery and release integrated device according to a preferred embodiment.
Detailed Description
In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, references to orientation or positional relationship such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are based on the orientation and positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of the invention.
In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, the terms "fixedly attached" and "fixedly attached" are to be construed broadly as any manner of connection without any positional or rotational relationship between the two, i.e. including non-removable, fixed, integrally connected, and fixedly connected by other means or elements.
In the claims, specification and drawings of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.
Referring to fig. 1, a preferred embodiment of an integrated forklift potential energy recovery and release device includes a tilting cylinder 1, lifting cylinders 2.1, 2.2, a three-position four-way electromagnetic directional valve 3, a first two-position two-way electromagnetic directional valve 4, a second two-position two-way electromagnetic directional valve 5, an energy recovery and release unit 20, a motor controller 13 and a battery 14.
The tilting cylinder 1 comprises a first rod cavity and a first rodless cavity, the three-position four-way electromagnetic directional valve 3 is connected with the first rod cavity, the first rodless cavity, the second two-position two-way electromagnetic directional valve 5 and the energy recovery and release unit 20, the energy recovery and release unit 20 is connected with the motor controller 13, and the motor controller 13 is connected with the storage battery 14; the lifting oil cylinders 2.1 and 2.2 comprise a second rod cavity and a second rodless cavity, the second rodless cavity is connected with the first two-position two-way electromagnetic directional valve 4, the first two-position two-way electromagnetic directional valve 4 is connected with the second two-position two-way electromagnetic directional valve 5 and the energy recovery and release unit 20, and the second two-position two-way electromagnetic directional valve 5 is connected with the energy recovery and release unit 20.
In this embodiment, two lifting cylinders 2.1 and 2.2 are provided, and the second rodless cavities of the two lifting cylinders 2.1 and 2.2 are connected with the first two-position two-way electromagnetic directional valve 4.
In this embodiment, the energy recovery and release unit 20 includes a hydraulic pump motor 11, a motor generator 12, and a first oil tank 15, the hydraulic pump motor 11 is connected to the motor generator 12, the three-position four-way electromagnetic directional valve 3, and the first oil tank 15, and the motor generator 12 is connected to the motor controller 13. Preferably, the hydraulic pump motor 11 is arranged coaxially with the motor generator 12 to reduce friction and improve efficiency.
In the embodiment, the device also comprises a first one-way valve 6 and a second one-way valve 7, wherein the inlet of the first one-way valve 6 is connected with the outlets of the hydraulic pump motor 11 and the second one-way valve 7, and the outlets of the first one-way valve 6 are connected with the three-position four-way electromagnetic directional valve 3 and the second two-position two-way electromagnetic directional valve 5; the inlet of the second one-way valve 7 is connected with the first two-position two-way electromagnetic directional valve 4 and the second two-position two-way electromagnetic directional valve 5, and the outlet of the second one-way valve 7 is connected with the hydraulic pump motor 11.
In this embodiment the device further comprises a throttle valve 8, which throttle valve 8 is connected between the first two-position two-way electromagnetic directional valve 4 and the inlet of the second one-way valve 7.
In this embodiment, the device further comprises a relief valve 9 and a second tank 17, wherein the inlet of the relief valve 9 is connected with the hydraulic pump motor 11, the inlet of the first check valve 6 and the outlet of the second check valve 7, and the outlet of the relief valve 9 is connected with the second tank 17.
In this embodiment, the device further includes a check valve 10 for supplementing oil and a third oil tank 16, where an inlet of the check valve 10 for supplementing oil is connected to the third oil tank 16, and an outlet of the check valve 10 for supplementing oil is connected to an inlet of the relief valve 9, the hydraulic pump motor 11, and an inlet of the first check valve 6.
The working method of the forklift potential energy recovery and release integrated device comprises the following steps:
the fork truck potential energy has two states when retrieving:
when the operating handle of the forklift drives the lifting oil cylinders 2.1 and 2.2 to drive the heavy objects to drop, the three-position four-way electromagnetic directional valve 3 is positioned in the middle position, the tilting oil cylinder 1 does not work, at the moment, the first two-position two-way electromagnetic directional valve 4 is electrified, the second two-position two-way electromagnetic directional valve 5 is not electrified, the pressure oil in the second rodless cavity of the lifting oil cylinders 2.1 and 2.2 flows into the hydraulic pump motor 11 after passing through the first two-position two-way electromagnetic directional valve 4, the throttle valve 8 and the second one-way valve 7, the hydraulic pump motor 11 is used as a motor to drive the motor generator 12 to be in a power generation state, and electric energy is stored in the storage battery 14 through the motor controller 13; due to the existence of the hydraulic pump motor 11, the differential pressure between two ends of the throttle valve 8 can be regulated, so that the accurate control of the descending speed is realized;
or,
when the lifting cylinders 2.1 and 2.2 are driven to drive the heavy objects to move downwards, the left or right position of the three-position four-way electromagnetic directional valve 3 works, the tilting cylinder 1 is in a working state, the working pressure of the tilting cylinder is lower than the pressure of the second rodless cavity of the lifting cylinders 2.1 and 2.2, at the moment, the first two-position two-way electromagnetic directional valve 4 and the second two-position two-way electromagnetic directional valve 5 are electrified, and the pressure oil of the second rodless cavity of the lifting cylinders 2.1 and 2.2 flows into the first rodless cavity of the tilting cylinder 1 after passing through the left or right position of the first two-position two-way electromagnetic directional valve 4, the second two-position two-way electromagnetic directional valve 5 and the three-position four-way electromagnetic directional valve 3, so that the tilting cylinder 1 is driven to tilt forwards and tilt backwards;
the energy release has two states:
when the lifting cylinders 2.1 and 2.2 are driven to drive the forks to lift, the first two-position two-way electromagnetic directional valve 4 and the second two-position two-way electromagnetic directional valve 5 are electrified, and the energy stored in the storage battery 14 is supplied to the motor generator 12 so as to be in a motor state, the hydraulic pump motor 11 is used as a hydraulic pump, the hydraulic pump outputs pressure oil outwards, the pressure oil enters the second rodless cavity of the lifting cylinders 2.1 and 2.2 through the first one-way valve 6, the second two-position two-way electromagnetic directional valve 5 and the first two-position two-way electromagnetic directional valve 4, and the lifting cylinders 2.1 and 2.2 are driven to drive the forks to complete lifting action, so that recycling of recovered energy is realized;
or,
when the tilting cylinder 1 is driven to work and the lifting cylinder 2 is not operated, the first two-position two-way electromagnetic directional valve 4 and the second two-position two-way electromagnetic directional valve 5 are not electrified, the three-position four-way electromagnetic directional valve 3 is electrified and is in a left position or a right position to work, at the moment, the energy stored in the storage battery 14 is supplied to the motor generator 12 so as to be in a motor state, the hydraulic pump motor 11 is used as a hydraulic pump, the hydraulic pump outputs pressure oil outwards, the pressure oil output by the hydraulic pump flows into a first rodless cavity of the tilting cylinder 1 after passing through the first one-way valve 6 and the three-position four-way electromagnetic directional valve 3, and the pressure oil is promoted to drive a fork to incline forwards or backwards, so that recycling of the recovered energy is realized.
The foregoing description is only illustrative of the preferred embodiments of the present invention, and therefore should not be taken as limiting the scope of the invention, for all changes and modifications that come within the meaning and range of equivalency of the claims and specification are therefore intended to be embraced therein.
Claims (6)
1. Fork truck potential energy is retrieved and is released integrated device, its characterized in that: it comprises the following steps: the tilting oil cylinder comprises a first rod cavity and a first rodless cavity, the three-position four-way electromagnetic reversing valve is connected with the first rod cavity, the first rodless cavity, the second two-position two-way electromagnetic reversing valve and the energy recovery and release unit, the energy recovery and release unit is connected with the motor controller, and the motor controller is connected with the storage battery; the lifting oil cylinder comprises a second rod cavity and a second rodless cavity, the second rodless cavity is connected with the first two-position two-way electromagnetic directional valve, the first two-position two-way electromagnetic directional valve is connected with the second two-position two-way electromagnetic directional valve and the energy recovery and release unit, and the second two-position two-way electromagnetic directional valve is connected with the energy recovery and release unit;
the energy recovery and release unit comprises a hydraulic pump motor, a motor generator and a first oil tank, wherein the hydraulic pump motor is connected with the motor generator, the three-position four-way electromagnetic reversing valve and the first oil tank, and the motor generator is connected with the motor controller;
the device also comprises a first one-way valve and a second one-way valve, wherein the inlet of the first one-way valve is connected with the hydraulic pump motor and the outlet of the second one-way valve, and the outlet of the first one-way valve is connected with the three-position four-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve; the inlet of the second one-way valve is connected with the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve, and the outlet of the second one-way valve is connected with the hydraulic pump motor.
2. The integrated forklift potential energy recovery and release device of claim 1, wherein: the device also comprises a throttle valve connected between the first two-position two-way electromagnetic directional valve and the inlet of the second one-way valve.
3. The integrated forklift potential energy recovery and release device of claim 2, wherein: the device also comprises an overflow valve and a second oil tank, wherein the inlet of the overflow valve is connected with the hydraulic pump motor, the inlet of the first one-way valve and the outlet of the second one-way valve, and the outlet of the overflow valve is connected with the second oil tank.
4. The integrated forklift potential energy recovery and release device of claim 3, wherein: the device also comprises an oil supplementing one-way valve and a third oil tank, wherein the inlet of the oil supplementing one-way valve is connected with the third oil tank, and the outlet of the oil supplementing one-way valve is connected with the inlet of the overflow valve, the hydraulic pump motor and the inlet of the first one-way valve.
5. The integrated forklift potential energy recovery and release device of claim 4, wherein: the two lifting cylinders are arranged, and the second rodless cavities of the two lifting cylinders are connected with the first two-position two-way electromagnetic directional valve.
6. The working method of forklift potential energy recovery and release integration, which is applied to the device of forklift potential energy recovery and release integration as claimed in any one of claims 4 to 5, is characterized in that: comprising the following steps:
the fork truck potential energy has two states when retrieving:
when the lifting oil cylinder is driven to drive a heavy object to descend, the three-position four-way electromagnetic directional valve is in a middle position, the tilting oil cylinder does not work, at the moment, the first two-position two-way electromagnetic directional valve is electrified, the second two-position two-way electromagnetic directional valve is not electrified, pressure oil in a second rodless cavity of the lifting oil cylinder flows into the hydraulic pump motor after passing through the first two-position two-way electromagnetic directional valve, the throttle valve and the second one-way valve, the hydraulic pump motor is used as a motor, the motor generator is in a power generation state, and electric energy is stored in the storage battery through the motor controller; the pressure difference between two ends of the throttle valve can be regulated due to the existence of the hydraulic pump motor, so that the accurate control of the descending speed is realized;
or,
when the lifting oil cylinder is driven to drive a heavy object to move down, the left or right position of the three-position four-way electromagnetic directional valve works, the tilting oil cylinder is in a working state, the working pressure of the tilting oil cylinder is lower than the pressure of the second rodless cavity of the lifting oil cylinder, at the moment, the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are electrified, and pressure oil of the second rodless cavity of the lifting oil cylinder flows into the first rodless cavity of the tilting oil cylinder after passing through the left or right position of the first two-position two-way electromagnetic directional valve, the second two-position two-way electromagnetic directional valve and the three-position four-way electromagnetic directional valve, so that the tilting oil cylinder is driven to tilt forward and backward by the heavy object;
the energy release has two states:
when the lifting oil cylinder is driven to drive the fork to lift, the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are electrified, at the moment, the energy stored in the storage battery is supplied to the motor generator so as to enable the motor generator to be in a motor state, the hydraulic pump motor is used as a hydraulic pump, the hydraulic pump outputs pressure oil outwards, the pressure oil enters a second rodless cavity of the lifting oil cylinder through the first one-way valve, the second two-position two-way electromagnetic directional valve and the first two-position two-way electromagnetic directional valve, and the lifting oil cylinder is pushed to drive the fork to complete lifting action, so that recycling of the recovered energy is realized;
or,
when the tilting cylinder is driven to work and the lifting cylinder is not operated, the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are not electrified, the three-position four-way electromagnetic directional valve is electrified and is in left position or right position to work, at the moment, the energy stored in the storage battery is supplied to the motor generator so that the motor generator is in a motor state, the hydraulic pump motor is used as a hydraulic pump, the hydraulic pump outputs pressure oil to the outside, the pressure oil output by the hydraulic pump flows into a first rodless cavity of the tilting cylinder after passing through the first one-way valve and the three-position four-way electromagnetic directional valve, and the pressure oil is promoted to drive the fork to tilt forwards or tilt backwards, so that recycling of the recovered energy is realized.
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| CN202110127810.3A CN113148914B (en) | 2021-01-29 | 2021-01-29 | Forklift potential energy recovery and release integrated device and working method |
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| CN114715818B (en) * | 2022-04-26 | 2023-05-16 | 华侨大学 | Separate type electro-hydraulic driven forklift potential energy recovery system and separate type electro-hydraulic driven forklift |
| CN114835059A (en) * | 2022-04-27 | 2022-08-02 | 广东海洋大学 | Simulation optimization system of engineering forklift |
| CN114940467B (en) * | 2022-05-24 | 2023-11-03 | 华侨大学 | Electro-hydraulic composite forklift and driving system, method and device thereof as well as storage medium |
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