CN114673716B - A forklift energy recovery system - Google Patents
A forklift energy recovery system Download PDFInfo
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- CN114673716B CN114673716B CN202210269381.8A CN202210269381A CN114673716B CN 114673716 B CN114673716 B CN 114673716B CN 202210269381 A CN202210269381 A CN 202210269381A CN 114673716 B CN114673716 B CN 114673716B
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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
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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
- F15B11/22—Synchronisation of the movement of 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
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/765—Control of position or angle of the output member
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Analytical Chemistry (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
本发明提供了一种叉车能量回收系统，包括液压驱动模块、液压控制模块和能量回收模块；所述液压驱动模块包括举升油缸组、液压动力单元和三位六通电磁换向阀，所述液压动力单元通过三位六通电磁换向阀与举升油缸组连通；所述能量回收模块包括回收油缸组、二位二通电磁换向阀、二位三通电磁换向阀；所述回收油缸组进口通过二位三通电磁换向阀与三位六通电磁换向阀的进口连通；所述回收油缸组进口通过二位二通电磁换向阀与液压动力单元连通；所述液压控制模块通过选择性的控制三位六通电磁换向阀、二位二通电磁换向阀和二位三通电磁换向阀的接合，用于回收负载下降过程的能量。本发明可有效提高叉车能量利用率和液压系统零部件的寿命。
The present invention provides a forklift energy recovery system, comprising a hydraulic drive module, a hydraulic control module and an energy recovery module; the hydraulic drive module comprises a lifting cylinder group, a hydraulic power unit and a three-position six-way electromagnetic reversing valve, and the hydraulic power unit is connected to the lifting cylinder group through the three-position six-way electromagnetic reversing valve; the energy recovery module comprises a recovery cylinder group, a two-position two-way electromagnetic reversing valve, and a two-position three-way electromagnetic reversing valve; the inlet of the recovery cylinder group is connected to the inlet of the three-position six-way electromagnetic reversing valve through the two-position three-way electromagnetic reversing valve; the inlet of the recovery cylinder group is connected to the hydraulic power unit through the two-position two-way electromagnetic reversing valve; the hydraulic control module is used to recover energy during the load lowering process by selectively controlling the engagement of the three-position six-way electromagnetic reversing valve, the two-position two-way electromagnetic reversing valve and the two-position three-way electromagnetic reversing valve. The present invention can effectively improve the energy utilization rate of the forklift and the life of the hydraulic system components.
Description
Technical Field
The invention relates to the field of forklifts or the field of energy conversion of lifting equipment, in particular to an energy recovery system of a forklift.
Background
With the rapid development of social economy, a modern industrial logistics system becomes an infrastructure for promoting the social development and the economic construction, and has important significance for the national economy scale formation and the modern industrial development. The types, frequencies and scales of logistics in modern industrial logistics systems are increasing, so that the importance of loading, unloading and transporting work is more remarkable, and the forklift is widely applied to various places in the industrial transportation industry by virtue of the efficient transporting capability and the strong operation flexibility. On the other hand, the energy crisis and the energy-saving and emission-reducing pressure conditions are severe, the energy-saving and environment-friendly industry greatly promotes the transformation and upgrading of the forklift, and higher standards and requirements are also provided for the energy consumption of the hydraulic system of the forklift.
The traditional forklift hydraulic system directly releases pressure oil to the oil tank through the overflow valve to realize load reduction, so that the forklift is large in load, huge in energy loss caused by the working characteristic of frequent lifting, and low in energy utilization efficiency. Therefore, a novel energy-saving design is needed for the lifting system of the forklift, lifting potential energy of the lifting system is reasonably recycled, and energy-saving transformation of the forklift is realized.
At present, the existing forklift energy recovery system generally adopts a hydraulic energy accumulator to save energy, but the technology is still immature, the energy recovery efficiency is difficult to guarantee, the control is complex, the energy accumulator equipment is huge, the internal space layout of the forklift and the operation maneuverability of the whole forklift are affected, and the energy recovery system is extremely inapplicable to the installation and the use of a small forklift.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a forklift energy recovery system which can effectively improve the energy utilization rate of a forklift and the service life of parts of a hydraulic system and reduce the use cost of the forklift.
The present invention achieves the above technical object by the following means.
The forklift energy recovery system comprises a hydraulic driving module, a hydraulic control module and an energy recovery module;
The hydraulic driving module comprises a lifting oil cylinder group, a hydraulic power unit and a three-position six-way electrified reversing valve, wherein the lifting oil cylinder group is used for lifting a load, and the hydraulic power unit is communicated with the lifting oil cylinder group through the three-position six-way electrified reversing valve and is used for synchronously lifting the lifting oil cylinder group;
The energy recovery module comprises a recovery oil cylinder group, a two-position two-way electromagnetic reversing valve and a two-position three-way electromagnetic reversing valve, wherein the recovery oil cylinder group is used for pushing a sliding block, an inlet of the recovery oil cylinder group is communicated with an inlet of the three-position six-way electromagnetic reversing valve through the two-position three-way electromagnetic reversing valve, and an inlet of the recovery oil cylinder group is communicated with the hydraulic power unit through the two-position two-way electromagnetic reversing valve;
The hydraulic control module selectively controls the engagement of the three-position six-way electromagnetic reversing valve, the two-position two-way electromagnetic reversing valve and the two-position three-way electromagnetic reversing valve, so that the outlet of the lifting cylinder group is communicated with the inlet of the recovery cylinder group, and the hydraulic control module is used for recovering the energy in the load descending process.
Further, the hydraulic power unit comprises an engine, a variable displacement hydraulic pump, a hydraulic oil tank and a second overflow valve, wherein the engine is used for driving the variable displacement hydraulic pump, an inlet of the variable displacement hydraulic pump is communicated with the hydraulic oil tank, and an outlet of the variable displacement hydraulic pump is provided with the second overflow valve.
Further, the interface of the three-position six-way electromagnetic reversing valve comprises a P port, a T port, a D port, an A port, a B port and a C port, wherein the P port and the D port are respectively communicated with the hydraulic power unit, the T port is communicated with the two-position three-way electromagnetic reversing valve, the A port and the C port are respectively communicated with the hydraulic oil tank, and the B port is communicated with the lifting oil cylinder group.
Further, the sliding block is a forklift balancing block.
Further, a first one-way valve is arranged between the inlet of the recovery cylinder group and the two-position three-way electromagnetic directional valve and used for preventing hydraulic oil from flowing from the recovery cylinder group to the two-position three-way electromagnetic directional valve, and a first overflow valve is arranged at the inlet of the recovery cylinder group.
The hydraulic control module comprises a first pressure sensor, a second pressure sensor and a control console, wherein the first pressure sensor is used for detecting the working pressure of the lifting cylinder group, the second pressure sensor is used for detecting the working pressure of the recovery cylinder group, and the control console selectively controls the joint of the three-position six-way electromagnetic reversing valve, the two-position two-way electromagnetic reversing valve and the two-position three-way electromagnetic reversing valve according to the detection values of the first pressure sensor and the second pressure sensor.
Further, when the forklift is used for carrying a load from a low place at a high place or the forklift is in idle load descending, if P r<pm and P l＞pr are used, the control console controls the SB2 electromagnetic coil of the three-position six-way electromagnetic reversing valve to be electrified, so that the port A is communicated with the port P and the port B is communicated with the port T respectively, and the control console controls the two-position three-way electromagnetic valve to enable the port T of the three-position six-way electromagnetic reversing valve to be communicated with the recovery cylinder group and is used for converting potential energy released in the idle load descending process of the load or the forklift into kinetic energy of the sliding block, wherein P r is a detection value of the second pressure sensor, P m is a pressure set by the first overflow valve, and P l is a detection value of the first pressure sensor;
When P r＝pm or P l≤pr, the control console controls the SB2 electromagnetic coil of the three-position six-way electromagnetic reversing valve to be electrified, so that the port A is communicated with the port P and the port B is communicated with the port T respectively, the control console controls the two-position three-way electromagnetic valve to reset so that the port T of the three-position six-way electromagnetic reversing valve is communicated with the hydraulic oil tank, and the control console controls the two-position two-way electromagnetic reversing valve to reset so that the inlet of the recovery oil cylinder group is communicated with the inlet of the variable displacement hydraulic pump and is used for descending a load or a forklift to a target height in an idle mode.
Further, when the forklift lifts the load from a high place where the load is carried from a low place or the forklift is empty, when P r is more than 0, the control console controls the SB1 electromagnetic coil of the three-position six-way electromagnetic reversing valve to be electrified, so that the port A is communicated with the port T and the port B is communicated with the port P respectively, the control console controls the two-position three-way electromagnetic valve to reset, so that the port T of the three-position six-way electromagnetic reversing valve is communicated with the hydraulic oil tank, the control console controls the two-position two-way valve to enable the recovery oil cylinder group to be communicated with the inlet of the variable displacement hydraulic pump, potential energy of the sliding block is converted into hydraulic energy, the engine provides auxiliary power until the load or the forklift is empty and lifts up to a target height, when P r =0, the control console controls the SB1 electromagnetic coil of the three-position six-way electromagnetic reversing valve to be electrified, so that the port A is communicated with the port T and the port B are communicated with the port P respectively, and the control console controls the two-position three-way electromagnetic valve to reset, so that the port T of the three-position six-way electromagnetic reversing valve is communicated with the hydraulic oil tank, so that the load or the forklift is empty and lifted up through the hydraulic power unit.
The invention has the beneficial effects that:
1. The forklift energy recovery system can solve the problems of high oil consumption and high emission of the traditional forklift, can recover potential energy of cargoes and forks in the process of transporting the cargoes and forks from a high place to a low place, and can release the recovered potential energy when the cargoes and the forks are lifted, so that the utilization efficiency of forklift energy is improved, and the use cost of the forklift is reduced.
2. According to the forklift energy recovery system, potential energy in the forklift load descending process is recovered through the sliding blocks, the potential energy of the load is converted into the potential energy of the sliding blocks, the energy conversion path is short, and the energy recovery efficiency is high.
3. According to the forklift energy recovery system, potential energy in the load descending process is recovered through the sliding block, compared with a traditional valve control system, throttling loss of the hydraulic valve is reduced, the situation that the temperature of parts of the hydraulic system is too high due to throttling is avoided, the service life of the hydraulic valve is prolonged, leakage loss of the hydraulic system is reduced, and energy recovery efficiency is further improved.
4. According to the forklift energy recovery system, the sliders with different weights can be selected to meet the forklift with different load requirements, and the product coverage range is wide.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described, in which the drawings are some embodiments of the invention, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a forklift energy recovery system according to the present invention.
Fig. 2 is a load lifting schematic diagram according to the present invention.
Fig. 3 is a schematic diagram of load-lowering energy recovery according to the present invention.
Fig. 4 is a load-down schematic diagram according to the present invention.
Fig. 5 is a schematic diagram of the slider descent assist load lifting according to the present invention.
In the figure:
1-engine, 2-rotation speed sensor, 3-ECU, 4-variable displacement hydraulic pump, 5-three-position six-way electric reversing valve, 6-hydraulic oil tank, 7-first lifting oil cylinder, 8-second lifting oil cylinder, 9-first pressure sensor, 10-load, 11-control desk, 12-slide block, 13-first recovery oil cylinder, 14-second recovery oil cylinder, 15-two-position two-way electromagnetic reversing valve, 16-second pressure sensor, 17-first one-way valve, 18-two-position three-way electromagnetic reversing valve, 20-second one-way valve, 22-first overflow valve and 23-second overflow valve.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore 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 connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between 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.
As shown in fig. 1, the forklift energy recovery system of the invention comprises a hydraulic driving module, a hydraulic control module and an energy recovery module;
The hydraulic driving module comprises a first lifting oil cylinder 7, a second lifting oil cylinder 8, a hydraulic power unit and a three-position six-way electrified reversing valve 5, wherein the first lifting oil cylinder 7 and the second lifting oil cylinder 8 are respectively arranged at the bottom of a load 10, the hydraulic power unit comprises an engine 1, a variable displacement hydraulic pump 4, a hydraulic oil tank 6 and a second overflow valve 23, the engine 1 is used for driving the variable displacement hydraulic pump 4, an inlet of the variable displacement hydraulic pump 4 is communicated with the hydraulic oil tank 6, a second one-way valve 20 is arranged between an inlet of the variable displacement hydraulic pump 4 and the hydraulic oil tank 6, and a second overflow valve 23 is arranged at an outlet of the variable displacement hydraulic pump 4. The input shaft of the variable displacement hydraulic pump 4 is provided with a rotation speed sensor 2 for detecting the rotation speed of the variable displacement hydraulic pump 4. The interface of the three-position six-way electrified reversing valve 5 comprises a P port, a T port, a D port, an A port, a B port and a C port, wherein the P port and the D port are respectively communicated with the hydraulic power unit, the T port is communicated with the two-position three-way electromagnetic reversing valve 18, the A port and the C port are respectively communicated with the hydraulic oil tank 6, and the B port is respectively communicated with the first lifting oil cylinder 7 and the second lifting oil cylinder 8. The first lift cylinder 7 and the second lift cylinder 8 can be seen as being connected in parallel between the port B and the load 10. The hydraulic power unit is communicated with the first lifting oil cylinder 7 and the second lifting oil cylinder 8 through the three-position six-way electrified reversing valve 5 and is used for synchronously lifting the first lifting oil cylinder 7 and the second lifting oil cylinder 8;
The energy recovery module comprises a first recovery oil cylinder 13, a second recovery oil cylinder 14, a two-position two-way electromagnetic directional valve 15 and a two-position three-way electromagnetic directional valve 18, wherein the first recovery oil cylinder 13 and the second recovery oil cylinder 14 are used for pushing a sliding block 12 to lift simultaneously, the sliding block 12 is a forklift balance block, inlets of the first recovery oil cylinder 13 and the second recovery oil cylinder 14 are communicated with a T-port of a three-position six-way electromagnetic directional valve 5 through the two-position three-way electromagnetic directional valve 18, inlets of the first recovery oil cylinder 13 and the second recovery oil cylinder 14 are communicated with an inlet of a variable displacement hydraulic pump 4 through the two-position two-way electromagnetic directional valve 15, a first one-way valve 17 is arranged between inlets of the first recovery oil cylinder 13 and the second recovery oil cylinder 14 and the two-position three-way electromagnetic directional valve 18 and used for preventing hydraulic oil from flowing from the first recovery oil cylinder 13 and the second recovery oil cylinder 14 to the two-position three-way electromagnetic directional valve 18, and inlets of the first recovery oil cylinder 13 and the second recovery oil cylinder 14 are provided with a first overflow valve 22.
The hydraulic control module comprises a first pressure sensor 9, a second pressure sensor 16, an ECU3 and a control console 11, wherein the first pressure sensor 9 is used for detecting working pressures of lifting cylinder groups 7 and 8, the second pressure sensor 16 is used for detecting working pressures of recovery cylinder groups 13 and 14, and the control console 11 selectively controls the engagement of a three-position six-way electromagnetic reversing valve 5, a two-position two-way electromagnetic reversing valve 15 and a two-position three-way electromagnetic reversing valve 18 according to detection values of the first pressure sensor 9 and the second pressure sensor 16 so that an outlet of the lifting cylinder group is communicated with an inlet of the recovery cylinder group and energy in the descending process of a load 10 is recovered. The ECU3 is for controlling the engine 1, and the console 11 gives instructions to the ECU 3.
The following description of the operation mode of the forklift potential energy recovery system is given by taking four typical operation conditions of load descending, idle descending, load ascending and idle ascending of the forklift as examples, which are used for further explanation of the invention, and are not to be construed as limiting the protection scope of the invention, and some insubstantial modifications and adjustments made by those skilled in the art based on the above description of the invention are also within the protection scope of the invention.
As shown in fig. 3, when the forklift is moving the load from a low place or the forklift is descending under no load, if P r<pm and P l＞pr are used, the console 11 controls the SB2 electromagnetic coil of the three-position six-way electromagnetic reversing valve 5 to be electrified, so that the port a and the port P are respectively communicated with the port B, the console 11 controls the two-position three-way electromagnetic valve 18 to respectively communicate the port T of the three-position six-way electromagnetic reversing valve 5 with the first recovery cylinder 13 and the second recovery cylinder 14, so as to convert potential energy released during the no-load descending of the load 10 or the forklift into kinetic energy of the slider 12, wherein P r is a detection value of the second pressure sensor 16, P m is a setting pressure of the first overflow valve 22, P l is a detection value of the first pressure sensor 9, when P r＝pm or P l≤pr is used, the console 11 controls the SB2 electromagnetic coil of the three-position six-way electromagnetic reversing valve 5 to be electrified, so that the port a and the port B are respectively communicated with the port T, and the console 11 controls the two-position three-way electromagnetic reversing valve 18 to reset the three-position six-way electromagnetic valve 5 to make the three-way electromagnetic reversing valve T be communicated with the port T6 to the hydraulic reversing valve 10 or the forklift to be descending under no load as shown in fig. 4.
As shown in fig. 2, when the forklift is carrying the load from a low place or the forklift is in no-load lifting, when P r >0, the console 11 controls the SB1 electromagnetic coil of the three-position six-way electromagnetic directional valve 5 to be electrified, so that the port A is communicated with the port T and the port B is communicated with the port P respectively, the console 11 controls the two-position three-way electromagnetic valve 18 to reset, so that the port T of the three-position six-way electromagnetic directional valve 5 is communicated with the hydraulic tank 6, the console 11 controls the two-position two-way valve 15 to enable the first recovery cylinder 13 and the second recovery cylinder 14 to be communicated with the inlet of the variable displacement hydraulic pump 4, potential energy of the sliding block 12 is converted into hydraulic energy, the engine 1 provides auxiliary power until the load 10 or the forklift is in no-load lifting to the target height, when P r =0, the console 11 controls the SB1 electromagnetic coil of the three-position six-way electromagnetic directional valve 5 is electrified, so that the port A is communicated with the port T and the port B are communicated with the port P respectively, and the console 11 controls the two-position three-way electromagnetic valve 18 to reset, so that the port T of the three-position six-way electromagnetic directional valve 5 is communicated with the hydraulic tank 6, so that the port 6 is communicated with the hydraulic tank 6, and the hydraulic power unit is used for lifting the load 10 or the hydraulic lifting unit as shown in no-load lifting.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. The forklift energy recovery system is characterized by comprising a hydraulic driving module, a hydraulic control module and an energy recovery module;
The hydraulic driving module comprises lifting oil cylinder groups (7 and 8), a hydraulic power unit and a three-position six-way electromagnetic reversing valve (5), wherein the lifting oil cylinder groups (7 and 8) are used for lifting loads (10), and the hydraulic power unit is communicated with the lifting oil cylinder groups (7 and 8) through the three-position six-way electromagnetic reversing valve (5) and is used for synchronously lifting the lifting oil cylinder groups (7 and 8);
The energy recovery module comprises recovery cylinder groups (13, 14), two-position two-way electromagnetic directional valves (15) and two-position three-way electromagnetic directional valves (18), wherein the recovery cylinder groups (13, 14) are used for pushing a sliding block (12), the inlets of the recovery cylinder groups (13, 14) are communicated with the inlets of the three-position six-way electromagnetic directional valves (5) through the two-position three-way electromagnetic directional valves (18), and the inlets of the recovery cylinder groups (13, 14) are communicated with the hydraulic power unit through the two-position two-way electromagnetic directional valves (15);
The hydraulic control module selectively controls the engagement of the three-position six-way electromagnetic reversing valve (5), the two-position two-way electromagnetic reversing valve (15) and the two-position three-way electromagnetic reversing valve (18) to ensure that the outlets of the lifting cylinder groups (7, 8) are communicated with the inlets of the recovery cylinder groups (13, 14) and are used for recovering the energy in the descending process of the load (10).
2. The forklift energy recovery system according to claim 1, characterized in that the hydraulic power unit comprises an engine (1), a variable displacement hydraulic pump (4), a hydraulic oil tank (6) and a second relief valve (23), the engine (1) is used for driving the variable displacement hydraulic pump (4), an inlet of the variable displacement hydraulic pump (4) is communicated with the hydraulic oil tank (6), and an outlet of the variable displacement hydraulic pump (4) is provided with the second relief valve (23).
3. The forklift energy recovery system according to claim 1, wherein the interface of the three-position six-way electromagnetic directional valve (5) comprises a port P, a port T, a port D, a port B and a port C, wherein the port P and the port D are respectively communicated with a hydraulic power unit, the port T is communicated with a two-position three-way electromagnetic directional valve (18), the port a and the port C are respectively communicated with a hydraulic oil tank (6), and the port B is communicated with lifting oil cylinder groups (7, 8).
4. The forklift energy recovery system according to claim 1, wherein the slider (12) is a forklift counterweight.
5. The forklift energy recovery system according to claim 1, wherein a first one-way valve (17) is arranged between the inlet of the recovery cylinder group (13, 14) and the two-position three-way electromagnetic directional valve (18) and is used for preventing hydraulic oil from flowing from the recovery cylinder group (13, 14) to the two-position three-way electromagnetic directional valve (18), and a first overflow valve (22) is arranged at the inlet of the recovery cylinder group (13, 14).
6. A forklift energy recovery system according to claim 3, characterized in that the hydraulic control module comprises a first pressure sensor (9), a second pressure sensor (16) and a control console (11), the first pressure sensor (9) is used for detecting the working pressure of the lifting cylinder groups (7, 8), the second pressure sensor (16) is used for detecting the working pressure of the recovery cylinder groups (13, 14), and the control console (11) selectively controls the engagement of the three-position six-way electromagnetic directional valve (5), the two-position two-way electromagnetic directional valve (15) and the two-position three-way electromagnetic directional valve (18) according to the detection values of the first pressure sensor (9) and the second pressure sensor (16).
7. The forklift energy recovery system according to claim 6, wherein when the forklift is moving a load from a high place to a low place or the forklift is moving down in a no-load manner, if P r<pm and P l＞pr are used, the console (11) controls the SB2 electromagnetic coil of the three-position six-way electromagnetic directional valve (5) to be electrified, so that the port a is communicated with the port P and the port B is communicated with the port T respectively, the console (11) controls the two-position three-way electromagnetic directional valve (18) to communicate the port T of the three-position six-way electromagnetic directional valve (5) with the recovery cylinder groups (13, 14) for converting potential energy released during the no-load falling of the load (10) or the forklift into kinetic energy of the sliding block (12), wherein P r is a detection value of the second pressure sensor (16), P m is a setting pressure of the first overflow valve (22), and P l is a detection value of the first pressure sensor (9);
When P r=pm or P l≤pr, the control console (11) controls the SB2 electromagnetic coil of the three-position six-way electromagnetic reversing valve (5) to be electrified, so that the port A is communicated with the port P and the port B is communicated with the port T respectively, the control console (11) controls the two-position three-way electromagnetic reversing valve (18) to reset, so that the port T of the three-position six-way electromagnetic reversing valve (5) is communicated with the hydraulic oil tank (6), and the control console (11) controls the two-position two-way electromagnetic reversing valve (15) to enable the inlets of the recovery oil cylinder groups (13, 14) to be communicated with the inlet of the variable displacement hydraulic pump (4) for descending the load (10) or the forklift to the target height under no load.
8. The forklift energy recovery system according to claim 7, wherein when a forklift is carrying a load from a low place or a forklift is in no-load lifting, when P r >0, the console (11) controls SB1 electromagnetic coils of the three-position six-way electromagnetic directional valve (5) to be electrified so that an port a and a port T and a port B are respectively communicated with a port P, the console (11) controls the two-position three-way electromagnetic directional valve (18) to reset so that the port T of the three-position six-way electromagnetic directional valve (5) is communicated with a hydraulic oil tank (6), the console (11) controls the two-position two-way electromagnetic directional valve (15) so that recovery oil cylinder groups (13, 14) are communicated with an inlet of the variable displacement hydraulic pump (4), potential energy through a sliding block (12) is converted into hydraulic energy, the engine (1) provides auxiliary power until the load (10) or the forklift is in no-load lifting target height, and when P r = 0, the console (11) controls SB1 electromagnetic coils of the three-position six-way electromagnetic directional valve (5) to be electrified so that the port a and the port B are respectively communicated with the hydraulic oil tank (6), and the two-position six-way electromagnetic directional valve (5) is in no-load lifting state through the potential energy conversion unit (12).
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| CN105179343A (en) * | 2015-10-27 | 2015-12-23 | 中国矿业大学 | Multi-cylinder synchronous energy-saving efficient hydraulic lifting system and method |
| CN105697475A (en) * | 2016-03-16 | 2016-06-22 | 太原理工大学 | Potential energy recycling system and method of higher-position extractor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2058270B1 (en) * | 2007-11-06 | 2010-05-26 | HAWE Hydraulik SE | Electrohydraulic lifting device |
| 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 |
| CN113148914B (en) * | 2021-01-29 | 2023-12-29 | 华侨大学 | Forklift potential energy recovery and release integrated device and working method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105179343A (en) * | 2015-10-27 | 2015-12-23 | 中国矿业大学 | Multi-cylinder synchronous energy-saving efficient hydraulic lifting system and method |
| CN105697475A (en) * | 2016-03-16 | 2016-06-22 | 太原理工大学 | Potential energy recycling system and method of higher-position extractor |
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