CN114658777A - Control method of hydraulic system - Google Patents
Control method of hydraulic system Download PDFInfo
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- CN114658777A CN114658777A CN202210227355.9A CN202210227355A CN114658777A CN 114658777 A CN114658777 A CN 114658777A CN 202210227355 A CN202210227355 A CN 202210227355A CN 114658777 A CN114658777 A CN 114658777A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000005086 pumping Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
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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
- B66F9/07509—Braking
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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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
-
- 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
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
- F16D2121/12—Fluid pressure for releasing a normally applied brake, the type of actuator being irrelevant or not provided for in groups F16D2121/04 - F16D2121/10
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The application relates to a control method of a hydraulic system, which comprises the following steps: when the liquid pump is gone into pressure fluid to the accumulator pump, first solenoid valve keeps the closed condition, and when the hydraulic pressure value of the pressure fluid of accumulator oil inlet was greater than or equal to first preset pressure value, first pressure switch can control first solenoid valve and open to intercommunication liquid pump and oil return device. When the accumulator pumps pressure oil into the driving device, the first electromagnetic valve is kept in an open state, and when the hydraulic value of the pressure oil at the oil inlet of the accumulator is smaller than or equal to a second preset pressure value, the second pressure switch can control the first electromagnetic valve to be closed so as to isolate the liquid pump and the oil return device. The first preset pressure value is larger than the second preset pressure value. The control method of the hydraulic system solves the problem that the service life of a forklift is influenced due to frequent opening and closing of the electromagnetic valve in the existing control method of the hydraulic system.
Description
Technical Field
The application relates to the technical field of engineering machinery, in particular to a control method of a hydraulic system.
Background
A forklift is indispensable for modern industrial development as an industrial transportation vehicle. Industrial transportation vehicles are widely used in ports, stations, airports, cargo yards, factory workshops, warehouses, distribution centers and the like, and fork trucks can enter cabins, carriages and containers to load, unload and transport pallet goods, and are indispensable equipment for pallet transportation and container transportation.
Forklifts generally have a hydraulic system for releasing the brake, which comprises, in particular, an electric motor, a liquid pump, an accumulator, a drive, an oil return, a solenoid valve and a pressure switch. The liquid pump is communicated with the oil return device through the electromagnetic valve, or the liquid pump is communicated with the energy accumulator, and the motor is electrically connected with the liquid pump so as to be used for driving the liquid pump to pump pressure oil into the energy accumulator or the oil return device. The pressure switch is arranged at an oil inlet of the energy accumulator and used for detecting the hydraulic value of pressure oil at the oil inlet of the energy accumulator, and the pressure switch is electrically connected with the electromagnetic valve and used for controlling the on-off of the electromagnetic valve. The accumulator is connected with the driving device and is used for pumping pressure oil into the driving device.
The existing hydraulic system control method comprises the following steps: when the liquid pump pumps pressure oil into the energy accumulator, the electromagnetic valve keeps a closed state, and when the hydraulic value of the pressure oil at the oil inlet of the energy accumulator is greater than or equal to a preset pressure value, the electromagnetic valve can be controlled to be opened by the pressure switch so as to communicate the liquid pump and the oil return device. When the accumulator pumps pressure oil into the driving device, the electromagnetic valve is kept in an open state, and when the hydraulic value of the pressure oil at the oil inlet of the accumulator is smaller than or equal to a preset pressure value, the electromagnetic valve can be controlled to be closed by the pressure switch so as to isolate the liquid pump and the oil return device. Generally, when the hydraulic value of the pressure oil at the oil inlet of the energy accumulator exceeds a preset pressure value, the pressure switch controls the electromagnetic valve to be opened, the liquid pump directly returns oil to the oil return device, and the energy accumulator pumps the pressure oil into the driving device so as to enable the driving device to relieve the braking of the forklift. Therefore, the hydraulic value of the pressure oil at the oil inlet of the energy accumulator can fluctuate frequently near the preset pressure value, so that the electromagnetic valve is opened and closed frequently, and the service life of the forklift is further influenced.
Disclosure of Invention
Therefore, a control method of the hydraulic system is needed to be provided, and the problem that the service life of the forklift is influenced due to frequent opening and closing of the electromagnetic valve in the existing control method of the hydraulic system is solved.
According to the control method of the hydraulic system, the hydraulic system comprises a motor, a liquid pump, an energy accumulator, a driving device, an oil return device, a first electromagnetic valve, a first pressure switch and a second pressure switch. The liquid pump passes through first solenoid valve intercommunication oil return device, perhaps, the liquid pump communicates the energy storage ware, and the liquid pump is connected to the motor electricity to be used for driving the liquid pump to go into pressure fluid to the energy storage ware or to oil return device pump. The first pressure switch and the second pressure switch are respectively arranged at an oil inlet of the energy accumulator and used for detecting the hydraulic value of pressure oil at the oil inlet of the energy accumulator, and the first pressure switch and the second pressure switch are respectively electrically connected with the first electromagnetic valve and used for controlling the on-off of the first electromagnetic valve. The accumulator is connected with the driving device and is used for pumping pressure oil into the driving device. The control method of the hydraulic system comprises the following steps: when the liquid pump is gone into pressure fluid to the accumulator pump, first solenoid valve keeps the closed condition, and when the hydraulic pressure value of the pressure fluid of accumulator oil inlet was greater than or equal to first preset pressure value, first pressure switch can control first solenoid valve and open to intercommunication liquid pump and oil return device. When the energy accumulator pumps pressure oil into the driving device, the first electromagnetic valve keeps an open state, and when the hydraulic value of the pressure oil at the oil inlet of the energy accumulator is smaller than or equal to a second preset pressure value, the second pressure switch can control the first electromagnetic valve to be closed so as to isolate the liquid pump and the oil return device. The first preset pressure value is larger than the second preset pressure value.
In one embodiment, the first predetermined pressure value is greater than or equal to 5MPa, and the second predetermined pressure value is less than or equal to 3.3 MPa.
In one embodiment, the hydraulic system further comprises a third pressure switch and an indicator light, the third pressure switch is electrically connected with the indicator light, the third pressure switch is arranged at an oil inlet of the driving device, and when the hydraulic value at the oil inlet of the driving device is larger than or equal to a third preset pressure value, the third pressure switch controls the indicator light to change the indication state. It can be understood that, by such an arrangement, it is advantageous to accurately indicate whether the hydraulic pressure value at the oil inlet of the driving device reaches the third preset pressure value.
In one embodiment, the hydraulic system further comprises a second solenoid valve, and the driving device can be communicated with the oil return device or the accumulator through the second solenoid valve. It can be understood that the arrangement is favorable for facilitating oil return of pressure oil in the driving device.
In one embodiment, the hydraulic system further comprises a diverter valve and a hydraulic steering device, and the hydraulic pump is communicated with the hydraulic steering device and the accumulator through the diverter valve respectively. It will be appreciated that such an arrangement is advantageous in reducing noise during operation of the hydraulic system.
In one embodiment, the diverter valve is a fixed flow diverter valve.
In one embodiment, the hydraulic system further comprises an overflow valve, and the overflow valve can directly communicate the flow dividing valve and the oil return device. It can be appreciated that such an arrangement is beneficial to improving the operational safety of the hydraulic system.
In one embodiment, the hydraulic system further comprises a control valve block, a main oil inlet channel, a first oil distribution channel, a second oil distribution channel, an oil return channel and an oil outlet channel are arranged in the control valve block, the main oil inlet channel is communicated with the first oil distribution channel and the second oil distribution channel through a flow divider valve, one end, far away from the flow divider valve, of the main oil inlet channel is connected with a liquid pump, one end, far away from the flow divider valve, of the first oil distribution channel is connected with a hydraulic steering device, one end, far away from the flow divider valve, of the second oil distribution channel is connected with an energy accumulator, the oil outlet channel is connected with the energy accumulator and a driving device, and the oil return channel is connected with the oil return device and the second oil distribution channel, or the oil return channel is connected with the oil return device and the oil outlet channel. It will be appreciated that such an arrangement is advantageous to improve the integration of the overall hydraulic system.
In one embodiment, the control valve block is further provided with a first branch channel and a second branch channel which are respectively communicated with the second oil distribution channel, the first pressure switch is arranged in the first branch channel, and the second pressure switch is arranged in the second branch channel. It will be appreciated that this arrangement facilitates the installation of the first and second pressure switches.
In one embodiment, the hydraulic system further includes a check valve disposed in the second rail for permitting one-way flow of pressurized oil from the splitter valve to the accumulator.
Compared with the prior art, according to the control method of the hydraulic system, when the hydraulic value of the pressure oil at the oil inlet of the energy accumulator exceeds a first preset pressure value, the pressure switch controls the first electromagnetic valve to be opened, the liquid pump directly returns oil to the oil return device, and the energy accumulator pumps the pressure oil into the driving device, so that the driving device relieves the braking of the forklift. Therefore, until the hydraulic value of the pressure oil at the oil inlet of the energy accumulator is reduced to be lower than a second preset pressure value, the pressure switch can control the electromagnetic valve to be closed, and the liquid pump pumps the pressure oil into the energy accumulator. And because the first preset pressure value is greater than the second preset pressure value, a certain time is required for the hydraulic value of the pressure oil at the oil inlet of the energy accumulator to fall to the second preset pressure value from the first preset pressure value, that is, the hydraulic value of the pressure oil at the oil inlet of the energy accumulator does not frequently fluctuate near the same preset pressure value, the first electromagnetic valve is not frequently switched on and off, and the service life of the forklift is obviously prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of a hydraulic system provided herein;
fig. 2 is a partial structural schematic diagram of a hydraulic system provided in the present application.
Reference numerals: 111. a motor; 112. a liquid pump; 120. a flow divider valve; 130. an accumulator; 140. a drive device; 150. an oil return device; 161. a first solenoid valve; 162. a second solenoid valve; 171. a first pressure switch; 172. a second pressure switch; 173. a third pressure switch; 180. a hydraulic steering device; 200. an overflow valve; 300. a one-way valve; 400. and a control valve block.
Detailed Description
In the description of the present application, it is to 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," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
A forklift is indispensable to the development of modern industry as an industrial transportation vehicle. Industrial transportation vehicles are widely used in ports, stations, airports, cargo yards, factory workshops, warehouses, distribution centers and the like, and fork trucks can enter cabins, carriages and containers to load, unload and transport pallet goods, and are indispensable equipment for pallet transportation and container transportation.
Forklifts generally have a hydraulic system for releasing the brake, which in particular comprises an electric motor, a liquid pump, an accumulator, a drive, an oil return, a solenoid valve and a pressure switch. The liquid pump is communicated with the oil return device through the electromagnetic valve, or the liquid pump is communicated with the energy accumulator, and the motor is electrically connected with the liquid pump so as to be used for driving the liquid pump to pump pressure oil into the energy accumulator or the oil return device. The pressure switch is arranged at an oil inlet of the energy accumulator and used for detecting the hydraulic value of pressure oil at the oil inlet of the energy accumulator, and the pressure switch is electrically connected with the electromagnetic valve and used for controlling the on-off of the electromagnetic valve. The accumulator is connected with the driving device and is used for pumping pressure oil into the driving device.
The existing control method of the hydraulic system comprises the following steps: when the liquid pump pumps pressure oil into the energy accumulator, the electromagnetic valve keeps a closed state, and when the hydraulic value of the pressure oil at the oil inlet of the energy accumulator is greater than or equal to a preset pressure value, the electromagnetic valve can be controlled to be opened by the pressure switch so as to communicate the liquid pump and the oil return device. When the accumulator pumps pressure oil into the driving device, the electromagnetic valve is kept in an open state, and when the hydraulic value of the pressure oil at the oil inlet of the accumulator is smaller than or equal to a preset pressure value, the electromagnetic valve can be controlled to be closed by the pressure switch so as to isolate the liquid pump and the oil return device. Generally, when the hydraulic value of the pressure oil at the oil inlet of the energy accumulator exceeds a preset pressure value, the pressure switch controls the electromagnetic valve to be opened, the liquid pump directly returns oil to the oil return device, and the energy accumulator pumps the pressure oil into the driving device so as to enable the driving device to relieve the braking of the forklift. Therefore, the hydraulic value of the pressure oil at the oil inlet of the energy accumulator can fluctuate frequently near the preset pressure value, so that the electromagnetic valve is opened and closed frequently, and the service life of the forklift is further influenced.
Referring to fig. 1, the problem that the service life of a forklift is affected due to frequent opening and closing of an electromagnetic valve in a control method of an existing hydraulic system is solved. The present application provides a control method of a hydraulic system including a motor 111, a liquid pump 112, an accumulator 130, a driving device 140, an oil return device 150, a first solenoid valve 161, a first pressure switch 171, and a second pressure switch 172. The liquid pump 112 is connected to the oil return device 150 through the first solenoid valve 161, or the liquid pump 112 is connected to the accumulator 130, and the motor 111 is electrically connected to the liquid pump 112 for driving the liquid pump 112 to pump the pressure oil to the accumulator 130 or to the oil return device 150. The first pressure switch 171 and the second pressure switch 172 are respectively disposed at an oil inlet of the accumulator 130 for detecting a hydraulic value of the pressure oil at the oil inlet of the accumulator 130, and the first pressure switch 171 and the second pressure switch 172 are respectively electrically connected to the first electromagnetic valve 161 for controlling on/off of the first electromagnetic valve 161. The accumulator 130 is connected to the driving device 140 for pumping pressurized oil into the driving device 140.
The control method of the hydraulic system comprises the following steps: when the liquid pump 112 pumps the pressure oil into the accumulator 130, the first electromagnetic valve 161 is kept in a closed state, and when the hydraulic pressure value of the pressure oil at the oil inlet of the accumulator 130 is greater than or equal to a first preset pressure value, the first pressure switch 171 can control the first electromagnetic valve 161 to be opened to communicate the liquid pump 112 and the oil return device 150. When the accumulator 130 pumps the pressure oil into the driving device 140, the first solenoid valve 161 is kept open, and when the hydraulic pressure of the pressure oil at the oil inlet of the accumulator 130 is less than or equal to a second preset pressure value, the second pressure switch 172 can control the first solenoid valve 161 to close to isolate the liquid pump 112 and the oil return device 150. The first preset pressure value is larger than the second preset pressure value.
In this way, when the hydraulic pressure of the pressure oil at the oil inlet of the accumulator 130 exceeds the first preset pressure value, the pressure switch controls the first electromagnetic valve 161 to open, the liquid pump 112 directly returns oil to the oil return device 150, and the accumulator 130 pumps the pressure oil into the driving device 140, so that the driving device 140 releases the braking of the forklift. Thus, the pressure switch will not control the solenoid valve to close until the hydraulic pressure value of the pressure oil at the oil inlet of the accumulator 130 drops below the second preset pressure value, and the liquid pump 112 pumps the pressure oil into the accumulator 130. Because the first preset pressure value is larger than the second preset pressure value, a certain time is required for the hydraulic value of the pressure oil at the oil inlet of the energy accumulator 130 to fall from the first preset pressure value to the second preset pressure value, that is, the hydraulic value of the pressure oil at the oil inlet of the energy accumulator 130 does not frequently fluctuate near the same preset pressure value, the first electromagnetic valve 161 is not frequently switched on and off, and the service life of the forklift is further obviously prolonged.
It should be noted that, in the actual operation process of the forklift, the first preset pressure value is greater than or equal to 5MPa, and the second preset pressure value is less than or equal to 3.3 MPa. But not limited thereto, the first preset pressure value and the second preset pressure value may also be other values according to actual needs, specifically, the first preset pressure value may also be 5.5MPa, and the second preset pressure value may also be 3MPa, which are not listed here.
In order to accurately indicate whether the hydraulic value at the oil inlet of the driving device 140 reaches the third preset pressure value, it should be noted that the third preset pressure value is the minimum hydraulic value for the operation of the driving device 140, in an embodiment, as shown in fig. 1, the hydraulic system further includes a third pressure switch 173 and an indicator lamp (not shown), the third pressure switch 173 is electrically connected to the indicator lamp, the third pressure switch 173 is disposed at the oil inlet of the driving device 140, and when the hydraulic value at the oil inlet of the driving device 140 is greater than or equal to the third preset pressure value, the third pressure switch 173 controls the indicator lamp to change the indicating state. Further, the indicator lamp may indicate whether the hydraulic pressure value at the oil inlet of the driving device 140 reaches the third preset pressure value by turning on or off or changing color.
Further, to facilitate the oil return of the pressure oil in the driving device 140, in an embodiment, as shown in fig. 1, the hydraulic system further includes a second electromagnetic valve 162, and the driving device 140 can be communicated with the oil return device 150 or the accumulator 130 through the second electromagnetic valve 162. It will be appreciated that the second solenoid valve 162 is a three-way valve. Specifically, the second solenoid valve 162 corresponds to a parking brake switch, and when the driving device 140 is connected to the accumulator 130, the pressure oil in the accumulator 130 pushes the spring in the driving device 140 to release the brake, and when the driving device 140 is connected to the oil return device 150, the driving device 140 maintains the parking brake state.
Generally, the hydraulic steering device 180 and the parking brake device of the forklift are controlled by a hydraulic system, and the existing hydraulic system mostly adopts a dual pump, specifically, a large displacement pump supplies the hydraulic steering device 180, and a small displacement pump supplies the parking brake device. In order to solve the above technical problem, in one embodiment, as shown in fig. 1, the hydraulic system further includes a flow dividing valve 120 and a hydraulic steering device 180, and the hydraulic pump 112 communicates the hydraulic steering device 180 and the accumulator 130 through the flow dividing valve 120. That is, the hydraulic system utilizes the diverter valve 120 instead of the dual pump for the diversion of pressurized oil. By providing the diverter valve 120, the synchronous oil feeding of the hydraulic steering gear 180 and the accumulator 130 can be accomplished only by a single liquid pump 112, and the noise generated by the single liquid pump 112 during operation is significantly lower than that of a tandem pump.
Further, the diverter valve 120 is a fixed flow diverter valve 120. That is, the amount of pressurized oil that the liquid pump 112 distributes to the hydraulic steering gear 180 and the accumulator 130, respectively, through the diverter valve 120 is fixed. But not limited thereto, in other embodiments, the flow dividing valve 120 may also be a variable flow dividing valve 120, specifically, a feedback oil path is provided in the flow dividing valve 120, a detection sensor is provided in the feedback oil path, and dynamic control of the division of the flow dividing valve 120 is realized through a hydraulic value in the feedback oil path detected by the detection sensor.
In order to improve the working safety of the hydraulic system, in an embodiment, as shown in fig. 1, the hydraulic system further includes a relief valve 200, and the relief valve 200 can directly communicate the flow dividing valve 120 and the oil returning device 150. When the hydraulic value of the pressure oil from the diverter valve 120 exceeds a certain value, the pressure oil can directly return through the overflow valve 200, and the hydraulic value of the pressure oil from the diverter valve 120 is prevented from further increasing.
In order to reduce the use of pipelines and improve the integration level of the entire hydraulic system, in an embodiment, as shown in fig. 1 and fig. 2, the hydraulic system further includes a control valve block 400, and a main oil inlet passage (not shown), a first oil distribution passage (not shown), a second oil distribution passage (not shown), an oil return passage (not shown), and an oil outlet passage (not shown) are disposed in the control valve block 400. Specifically, the main oil inlet channel communicates with the first oil distribution channel and the second oil distribution channel through the flow divider valve 120, one end of the main oil inlet channel, which is far away from the flow divider valve 120, is connected to the liquid pump 112, one end of the first oil distribution channel, which is far away from the flow divider valve 120, is connected to the hydraulic steering device 180, one end of the second oil distribution channel, which is far away from the flow divider valve 120, is connected to the energy accumulator 130, the oil outlet channel is connected to the energy accumulator 130 and the driving device 140, and the oil return channel connects the oil return device 150 and the second oil distribution channel, or the oil return channel connects the oil return device 150 and the oil outlet channel. Further, the hydraulic system further includes a check valve 300, and the check valve 300 is disposed in the second oil distribution passage to allow one-way flow of the pressurized oil from the flow divider valve 120 to the accumulator 130.
In order to facilitate the installation of the first pressure switch 171 and the second pressure switch 172, the control valve block 400 is further provided with a first branch passage (not shown) and a second branch passage (not shown) respectively communicating with the second branch oil passage, the first pressure switch 171 is provided in the first branch passage, and the second pressure switch 172 is provided in the second branch passage.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A control method of a hydraulic system is characterized in that the hydraulic system comprises a motor (111), a liquid pump (112), an accumulator (130), a driving device (140), an oil return device (150), a first electromagnetic valve (161), a first pressure switch (171) and a second pressure switch (172); the liquid pump (112) is communicated with the oil return device (150) through the first electromagnetic valve (161), or the liquid pump (112) is communicated with the energy accumulator (130), and the motor (111) is electrically connected with the liquid pump (112) and is used for driving the liquid pump (112) to pump pressure oil into the energy accumulator (130) or the oil return device (150); the first pressure switch (171) and the second pressure switch (172) are respectively arranged at an oil inlet of the energy accumulator (130) and used for detecting a hydraulic value of pressure oil at the oil inlet of the energy accumulator (130), and the first pressure switch (171) and the second pressure switch (172) are respectively electrically connected with the first electromagnetic valve (161) and used for controlling the on-off of the first electromagnetic valve (161); the accumulator (130) is connected with the driving device (140) and is used for pumping pressure oil into the driving device (140);
the control method of the hydraulic system comprises the following steps: when the liquid pump (112) pumps pressure oil into the accumulator (130), the first electromagnetic valve (161) keeps a closed state, and when the hydraulic value of the pressure oil at the oil inlet of the accumulator (130) is greater than or equal to a first preset pressure value, the first pressure switch (171) can control the first electromagnetic valve (161) to be opened so as to communicate the liquid pump (112) with the oil return device (150);
when the accumulator (130) pumps pressure oil into the driving device (140), the first electromagnetic valve (161) keeps an open state, and when the hydraulic value of the pressure oil at the oil inlet of the accumulator (130) is smaller than or equal to a second preset pressure value, the second pressure switch (172) can control the first electromagnetic valve (161) to close so as to isolate the liquid pump (112) and the oil return device (150);
the first preset pressure value is larger than the second preset pressure value.
2. The hydraulic system control method according to claim 1, characterized in that the first preset pressure value is greater than or equal to 5MPa and the second preset pressure value is less than or equal to 3.3 MPa.
3. The hydraulic system control method according to claim 1, characterized in that the hydraulic system further comprises a third pressure switch (173) and an indicator light, the third pressure switch (173) is electrically connected to the indicator light, the third pressure switch (173) is arranged at an oil inlet of the driving device (140), and when the hydraulic pressure value at the oil inlet of the driving device (140) is greater than or equal to a third preset pressure value, the third pressure switch (173) controls the indicator light to change the indication state.
4. The hydraulic system control method according to claim 1, characterized in that the hydraulic system further comprises a second solenoid valve (162), the drive device (140) being able to communicate with the oil return device (150) or the accumulator (130) via the second solenoid valve (162).
5. The method of claim 1, further comprising a diverter valve (120) and a hydraulic steering device (180), wherein the hydraulic pump (112) communicates the hydraulic steering device (180) and the accumulator (130) through the diverter valve (120), respectively.
6. A control method of a hydraulic system according to claim 5, characterized in that the splitter valve (120) is a fixed flow splitter valve (120).
7. The control method of a hydraulic system according to claim 5, characterized in that the hydraulic system further comprises a relief valve (200), the relief valve (200) being capable of directly communicating the flow divider valve (120) and the oil return device (150).
8. The control method of the hydraulic system according to claim 5, wherein the hydraulic system further comprises a control valve block (400), a main oil inlet passage, a first oil distribution passage, a second oil distribution passage, an oil return passage and an oil outlet passage are arranged in the control valve block (400), the main oil inlet passage communicates with the first oil distribution passage and the second oil distribution passage through the flow divider valve (120), one end of the main oil inlet passage far away from the flow divider valve (120) is connected with the liquid pump (112), one end of the first oil distribution passage far away from the flow divider valve (120) is connected with the hydraulic steering device (180), one end of the second oil distribution passage far away from the flow divider valve (120) is connected with the energy accumulator (130), the oil outlet passage is connected with the energy accumulator (130) and the driving device (140), and the oil return passage is connected with the oil return device (150) and the second oil distribution passage, or the oil return channel is connected with the oil return device (150) and the oil outlet channel.
9. The control method of a hydraulic system according to claim 8, characterized in that the control valve block (400) is further provided with a first branch passage and a second branch passage that communicate with the second branch oil passage, respectively, the first pressure switch (171) is provided in the first branch passage, and the second pressure switch (172) is provided in the second branch passage.
10. The method of claim 8, further comprising a check valve (300), the check valve (300) being disposed in the second oil gallery to provide one-way flow of pressurized oil from the diverter valve (120) to the accumulator (130).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210227355.9A CN114658777B (en) | 2022-03-08 | 2022-03-08 | Control method of hydraulic system |
| CN202311427740.9A CN117469323A (en) | 2022-03-08 | 2022-03-08 | Control method of hydraulic system |
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| CN202210227355.9A CN114658777B (en) | 2022-03-08 | 2022-03-08 | Control method of hydraulic system |
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| CN202311427740.9A Division CN117469323A (en) | 2022-03-08 | 2022-03-08 | Control method of hydraulic system |
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| CN114658777A true CN114658777A (en) | 2022-06-24 |
| CN114658777B CN114658777B (en) | 2023-12-26 |
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| CN202210227355.9A Active CN114658777B (en) | 2022-03-08 | 2022-03-08 | Control method of hydraulic system |
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| CN202311427740.9A Pending CN117469323A (en) | 2022-03-08 | 2022-03-08 | Control method of hydraulic system |
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| CN113389761A (en) * | 2021-07-20 | 2021-09-14 | 湖南星邦智能装备股份有限公司 | Scissor-fork type aerial work platform and floating control system thereof |
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2022
- 2022-03-08 CN CN202311427740.9A patent/CN117469323A/en active Pending
- 2022-03-08 CN CN202210227355.9A patent/CN114658777B/en active Active
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| CN102114833A (en) * | 2009-12-31 | 2011-07-06 | 中国神华能源股份有限公司 | Hydraulic control system for brakes |
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| CN102632922A (en) * | 2011-12-06 | 2012-08-15 | 三一重型装备有限公司 | Dump truck for mine and steering brake control device thereof |
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| Publication number | Publication date |
|---|---|
| CN117469323A (en) | 2024-01-30 |
| CN114658777B (en) | 2023-12-26 |
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