CN110905892A - Electro-hydraulic system with self-leveling function and control method thereof - Google Patents
Electro-hydraulic system with self-leveling function and control method thereof Download PDFInfo
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- CN110905892A CN110905892A CN201911290022.5A CN201911290022A CN110905892A CN 110905892 A CN110905892 A CN 110905892A CN 201911290022 A CN201911290022 A CN 201911290022A CN 110905892 A CN110905892 A CN 110905892A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 2
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 description 1
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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
- F15B21/08—Servomotor systems incorporating electrically operated control 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
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B2013/0448—Actuation by solenoid and permanent magnet
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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
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
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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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
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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
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
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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
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
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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
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
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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
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6656—Closed loop control, i.e. control using feedback
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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
- F15B2211/7656—Control of position or angle of the output member with continuous position control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
An electro-hydraulic system with a self-leveling function and a control method thereof, wherein the electro-hydraulic system with the self-leveling function comprises a workbench and an electro-hydraulic cylinder, the electro-hydraulic cylinder is arranged on the workbench, and the electro-hydraulic cylinder comprises: the motor-pump set comprises a motor and a hydraulic pump connected with the motor; the level meter is used for detecting the levelness of the workbench; the hydraulic cylinder is connected with the hydraulic pump and comprises a cylinder barrel and a piston rod; and the controller is respectively connected with the motor and the level gauge. According to the electro-hydraulic system with the self-leveling function and the control method thereof, the levelness of the workbench is detected in real time through the level meter, the levelness of the workbench is adjusted in real time by the controller within a preset range according to the levelness detected by the level meter, automatic adjustment and maintenance of the levelness of the workbench can be completed without additionally arranging other peripherals and control systems, hydraulic pipeline joints, control cables, mechanical chains and the like can be omitted, and the electro-hydraulic system with the self-leveling function and the control method thereof have the advantages of compact structure and good independence.
Description
Technical Field
The invention belongs to the field of hydraulic mechanical equipment, and particularly relates to an electro-hydraulic system with a self-leveling function and a control method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
A great deal of platform leveling requirements exist in engineering machinery, agricultural machinery, industrial equipment and military machinery, such as the horizontal adjustment of working buckets of high-altitude operation machinery, such as an overhead working truck, a fire engine, a bridge maintenance car and the like; the working bucket is fixedly connected with the arm support, the levelness of the working bucket is changed along with the change of the lifting angle of the arm support, and a set of leveling system is needed to keep the working bucket horizontal at any time.
At present, hydraulic leveling systems used in most of the high-altitude operation industry can only complete the adjustment work of levelness by high-pressure power oil, a proportional valve, a level meter and a controller; for the high-altitude operation machinery, power and control systems are all from chassis vehicles, so that hydraulic pipelines, sensor cables and control cables which are dozens of meters long (determined by the operation range of the high-altitude machinery) need to be laid, a chain system is designed on a boom to transmit signals or oil, a horizontal sensor, a limit sensor and the like are mounted on a working bucket, the pipelines are numerous, the system is complex, the cost is high, and the high-altitude operation machinery is easy to interfere due to long control distance and has slow response.
Disclosure of Invention
In view of the above, it is desirable to provide an electro-hydraulic system with a self-leveling function and a control method thereof, which can simplify the structure of the electro-hydraulic system.
An electro-hydraulic system with self-leveling function, includes workstation and electro-hydraulic cylinder, electro-hydraulic cylinder locates the workstation, electro-hydraulic cylinder includes:
the motor-pump set comprises a motor and a hydraulic pump connected with the motor;
the level meter is used for detecting the levelness of the workbench;
the hydraulic cylinder is connected with the hydraulic pump and comprises a cylinder barrel and a piston rod, and the piston rod is arranged in the cylinder barrel;
and the controller is respectively connected with the motor and the level meter and is used for controlling the motor to drive the hydraulic pump to convey oil to the hydraulic cylinder to push the hydraulic cylinder to keep the levelness of the workbench within a preset range according to the levelness detected by the level meter.
Preferably, the hydraulic pump further comprises a valve switch assembly, and the hydraulic pump is connected to the hydraulic cylinder through the valve switch assembly and is used for controlling the oil flow direction of the hydraulic cylinder.
Preferably, the valve switch subassembly includes the switching-over valve, the one end of switching-over valve is connected the pneumatic cylinder, one end is connected in addition hydraulic pump and oil tank make the fluid warp of hydraulic pump output the switching-over valve gets into the pneumatic cylinder, and the fluid warp of pneumatic cylinder the switching-over valve flows back to the oil tank.
Preferably, the reversing valve is a three-position two-way electromagnetic valve.
Preferably, the valve switch assembly further comprises a hydraulic lock, the hydraulic lock is a one-way valve, the oil inlet end and the oil return end of the hydraulic lock are connected with the reversing valve, and the oil outlet end of the hydraulic lock is connected with the rodless cavity of the hydraulic cylinder.
Preferably, a retraction oil path and an extension oil path are arranged in the piston rod, a rod cavity of the hydraulic cylinder is connected with the reversing valve through the retraction oil path, and a rodless cavity of the hydraulic cylinder is connected with the reversing valve through the extension oil path;
the piston rod is connected to the workbench, and oil pumped out by the hydraulic pump enters the hydraulic cylinder through an extending oil path or a retracting oil path in the piston rod to push the cylinder barrel to move along the length direction of the piston rod.
An electro-hydraulic control method with a self-leveling function comprises the following steps:
the gradienter detects the levelness of the working platform;
if the levelness detected by the level gauge exceeds a preset range, the controller controls the motor to rotate;
the motor drives the hydraulic pump to drive oil liquid to enter the hydraulic cylinder so as to drive the cylinder barrel to extend out or retract along the length direction of the piston rod to adjust the levelness of the workbench to the preset range.
Preferably, the motor drives the hydraulic pump to drive the oil into the hydraulic cylinder so as to drive the cylinder barrel to extend or retract along the length direction of the piston rod comprises:
the oil pumped by the hydraulic pump enters a rodless cavity of the hydraulic cylinder through a reversing valve to push the cylinder barrel to extend out along the length direction of the piston rod, an
Oil pumped by the hydraulic pump enters a rod cavity of the hydraulic cylinder through the reversing valve so as to push the cylinder barrel to retract along the length direction of the piston rod.
Preferably, the step of enabling the oil pumped out by the hydraulic pump to enter the rodless cavity of the hydraulic cylinder through the reversing valve comprises the following steps:
oil pumped by the hydraulic pump sequentially enters the rodless cavity through the reversing valve and the extended oil way in the piston rod.
Preferably, the oil pumped out by the hydraulic pump enters the rod cavity of the hydraulic cylinder through the reversing valve, and the oil-water separator comprises:
and oil pumped out by the hydraulic pump sequentially enters the rod cavity through the reversing valve and a retraction oil way in the piston rod.
Compared with the prior art, the electro-hydraulic system with the self-leveling function and the control method thereof have the advantages that the levelness of the workbench is detected in real time through the level gauge, the controller drives the hydraulic pump to pump oil out through the motor according to the levelness detected by the level gauge to drive the hydraulic cylinder to act, and therefore the levelness of the workbench is adjusted within the preset range in real time. Therefore, the electro-hydraulic system with the self-leveling function can complete automatic levelness adjustment and maintenance of the workbench only by direct current power supply without additionally arranging other peripherals and control systems, can save a level gauge, dozens of meters of hydraulic pipeline joints, control cables, mechanical chains and the like particularly for the levelness adjustment of the working bucket of the overhead working truck, and has the advantages of compact structure and good independence.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a hydraulic structural view having an electro-hydraulic cylinder.
Fig. 2 is a schematic structural view of the electrohydraulic cylinder.
Fig. 3 is a schematic sectional view in the direction III-III in fig. 2.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In various embodiments of the present invention, for convenience in description and not in limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
The electro-hydraulic system with the self-leveling function comprises a workbench and an electro-hydraulic cylinder, wherein the electro-hydraulic cylinder is arranged on the workbench and used for supporting the workbench. In some embodiments, the work platform may be a bucket of an aerial work machine such as an aerial work vehicle, fire engine, bridge maintenance vehicle, or the like, and the electric cylinder is disposed on the work platform and may extend downward to support the work platform.
Fig. 1 is a hydraulic structural view of an electrohydraulic cylinder, and fig. 2 is a structural schematic view of the electrohydraulic cylinder. As shown in fig. 1 and 2, the electro-hydraulic cylinder comprises a controller 20, a level gauge 21, a motor-pump set 10, a hydraulic cylinder 30 and an oil tank 50, wherein the level gauge 21, the controller 20, the motor-pump set 10 and the oil tank 50 are all integrated on the hydraulic cylinder 30, so that the electro-hydraulic cylinder is miniaturized.
The controller 20 may execute pre-stored program instructions. The level gauge 21 is in signal connection with the controller 20 for detecting the levelness of the worktable.
The motor-pump unit 10 includes a motor 11 and a hydraulic pump 12 connected to the motor 11, wherein the motor 11 is connected to a controller 20 and is operable according to a control command of the controller 20, and the control command includes, but is not limited to, a rotation speed, a steering direction, and the like of the motor 11. The output shaft of the motor 11 is connected with the hydraulic pump 12, and high-pressure oil is pumped out under the driving of the motor 11 to push the hydraulic cylinder 30 to extend or retract.
Fig. 3 is a schematic sectional view in the direction III-III in fig. 2. As shown in fig. 1 and 3, the hydraulic cylinder 30 is connected to the hydraulic pump 12, and the hydraulic cylinder 30 is pushed by the high-pressure oil pumped by the hydraulic pump 12 to perform a predetermined operation. The hydraulic cylinder 30 includes a cylinder tube 31 and a piston rod 32. The piston rod 32 is disposed in the cylinder 31, and the piston of the piston rod 32 divides the cylinder 31 into a rod chamber 311 and a rodless chamber 312. When high-pressure oil pumped by the hydraulic pump 12 enters the rodless cavity 312, the piston rod 32 is pushed to extend out of the cylinder 31; when the high-pressure oil pumped by the hydraulic pump 12 enters the rod chamber 311, the piston rod 32 can be pushed to retract, so that the piston rod 32 can move back and forth along the length direction of the cylinder 31 to extend or retract.
In addition, a retraction oil passage 322 and an extension oil passage 321 are provided in the piston rod 32, and oil in the rod chamber 311 and the rod-less chamber 312 can be introduced or discharged through the retraction oil passage 322 and the extension oil passage 321 provided in the piston rod 32. The piston rod 32 is connected to the working platform, and the oil pumped by the hydraulic pump 12 enters the hydraulic cylinder 30 through an extending oil path 321 or a retracting oil path 322 in the piston rod 32 to push the cylinder tube 31 to move along the length direction of the piston rod 32. Thus, the oil pipe connected with the hydraulic cylinder 30 does not need to move along with the movement of the cylinder barrel 31, so that the oil pipe connected with the hydraulic cylinder 30 can be fixedly connected, the reliability of the hydraulic cylinder 30 is improved, the length of the oil pipe connected with the hydraulic cylinder 30 is shortened, and the cost of the electro-hydraulic cylinder is reduced.
The valve switch assembly 40 is used to control the flow direction of the oil of the hydraulic cylinder 30, and the hydraulic pump 12 is connected to the hydraulic cylinder 30 through the valve switch assembly 40. Specifically, the valve switch assembly 40 includes a directional valve 41 and a hydraulic lock 42. As shown in fig. 1, the directional control valve 41 is a three-position two-way solenoid valve, one end of which is connected to the hydraulic cylinder 30, and the other end of which is connected to the hydraulic pump 12 and the oil tank 50, so that the oil output from the hydraulic pump 12 enters the hydraulic cylinder 30 through the directional control valve 41, and the oil in the hydraulic cylinder 30 flows back to the oil tank 50 through the directional control valve 41. In the present embodiment, the rod chamber 311 of the hydraulic cylinder 30 is connected to the selector valve 41 through the retraction oil passage 322, and the rod-less chamber 312 of the hydraulic cylinder 30 is connected to the selector valve 41 through the extension oil passage 321.
The hydraulic lock 42 is a one-way valve, the oil inlet end and the oil return end of the hydraulic lock 42 are connected to the reversing valve 41, and the oil outlet end is connected to the rodless cavity 312 of the hydraulic cylinder 30. After the high pressure oil is supplied to the rodless chamber 312, the oil pressure within the rodless chamber 312 may be maintained by the hydraulic lock 42 to maintain the position of the piston rod 32.
The operation of the above-described electro-hydraulic system is described in detail below.
First, the level gauge 21 detects the levelness of the work platform, and if the levelness detected by the level gauge 21 is out of a preset range, the controller 20 controls the motor 11 to rotate.
Then, according to the deviation degree of the levelness from the preset range, if the hydraulic cylinder 30 is controlled to extend to adjust the levelness, the motor 11 drives the hydraulic pump 12 to drive the oil to enter the rodless cavity 312 of the hydraulic cylinder 30 through the extending oil path 321 arranged in the piston rod 32 to push the cylinder barrel 31 to extend along the length direction of the piston rod 32.
If the hydraulic cylinder 30 needs to be controlled to retract to adjust the levelness, the motor 11 drives the hydraulic pump 12 to drive the oil to enter the rod cavity 311 of the hydraulic cylinder 30 through the retraction oil path 322 arranged in the piston rod 32 so as to push the cylinder barrel 31 to retract along the length direction of the piston rod 32.
In this way, the cylinder 31 extends or retracts along the length direction of the piston rod 32 to adjust the levelness of the worktable to the preset range.
The electro-hydraulic system with the self-leveling function and the control method thereof detect the levelness of the workbench in real time through the level gauge 21, and the controller 20 drives the hydraulic pump 12 to pump oil out through the motor 11 according to the levelness detected by the level gauge 21 to drive the hydraulic cylinder 30 to move, so as to adjust the levelness of the workbench in real time within a preset range. Therefore, the electro-hydraulic system with the self-leveling function can complete automatic levelness adjustment and maintenance of the workbench only by direct current power supply without additionally arranging other peripherals and control systems, can save a level gauge 21, dozens of meters of hydraulic pipeline joints, control cables, mechanical chains and the like particularly for the levelness adjustment of the working bucket of the overhead working truck, and has the advantages of compact structure and good independence.
Further, the oil pipe connected to the hydraulic cylinder 30 may be directly connected to the piston rod 32, and the oil pipe may deliver oil or return oil to the rod chamber 311 or the rod-less chamber 312 of the hydraulic cylinder 30 through the extension oil passage 321 and the retraction oil passage 322 provided in the piston rod 32, in combination with the inverted structure of the hydraulic cylinder 30, that is, the piston rod 32 is connected to the work platform, and the cylinder 31 extends or retracts along the length direction of the piston rod 32. Thus, the oil pipe connected with the hydraulic cylinder 30 does not need to move along with the extension or retraction of the hydraulic cylinder 30, thereby simplifying the layout of the oil pipe and the structure of an electro-hydraulic system and shortening the length of the oil pipe.
In the several embodiments provided in the present invention, it should be understood that the disclosed system and components may be implemented in other ways. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units or means recited in the system claims may also be implemented by one and the same unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides an electro-hydraulic system with from leveling function, includes workstation and electro-hydraulic cylinder, electro-hydraulic cylinder locates the workstation, its characterized in that, electro-hydraulic cylinder includes:
the motor-pump set comprises a motor and a hydraulic pump connected with the motor;
the level meter is used for detecting the levelness of the workbench;
the hydraulic cylinder is connected with the hydraulic pump and comprises a cylinder barrel and a piston rod, and the piston rod is arranged in the cylinder barrel;
and the controller is respectively connected with the motor and the level meter and is used for controlling the motor to drive the hydraulic pump to convey oil to the hydraulic cylinder to push the hydraulic cylinder to keep the levelness of the workbench within a preset range according to the levelness detected by the level meter.
2. The electro-hydraulic system with a self-leveling function of claim 1, further comprising a valve switch assembly through which the hydraulic pump is connected to the hydraulic cylinder for controlling a flow direction of oil of the hydraulic cylinder.
3. The electro-hydraulic system with a self-leveling function as claimed in claim 2, wherein the valve switch assembly includes a direction valve having one end connected to the hydraulic cylinder and the other end connected to the hydraulic pump and the tank, so that the oil output from the hydraulic pump enters the hydraulic cylinder through the direction valve and the oil of the hydraulic cylinder returns to the tank through the direction valve.
4. The electro-hydraulic system with a self-leveling function as claimed in claim 3, wherein the directional valve is a three-position, two-way solenoid valve.
5. The electro-hydraulic system with a self-leveling function according to claim 4, wherein the valve switch assembly further comprises a hydraulic lock, the hydraulic lock is a one-way valve, an oil inlet end and an oil return end of the hydraulic lock are connected to the reversing valve, and an oil outlet end of the hydraulic lock is connected to a rodless cavity of the hydraulic cylinder.
6. The electro-hydraulic system with a self-leveling function as claimed in claim 5, wherein a retraction oil path and an extension oil path are provided in the piston rod, the rod chamber of the hydraulic cylinder is connected to the directional valve through the retraction oil path, and the rod-less chamber of the hydraulic cylinder is connected to the directional valve through the extension oil path;
the piston rod is connected to the workbench, and oil pumped out by the hydraulic pump enters the hydraulic cylinder through an extending oil path or a retracting oil path in the piston rod to push the cylinder barrel to move along the length direction of the piston rod.
7. An electro-hydraulic control method with a self-leveling function is characterized by comprising the following steps:
the gradienter detects the levelness of the working platform;
if the levelness detected by the level gauge exceeds a preset range, the controller controls the motor to rotate;
the motor drives the hydraulic pump to drive oil liquid to enter the hydraulic cylinder so as to drive the cylinder barrel to extend out or retract along the length direction of the piston rod to adjust the levelness of the workbench to the preset range.
8. The electro-hydraulic control method with the self-leveling function according to claim 7, wherein the driving of the hydraulic pump by the motor to drive the hydraulic fluid into the hydraulic cylinder to drive the cylinder barrel to extend or retract along the length of the piston rod comprises:
the oil pumped by the hydraulic pump enters a rodless cavity of the hydraulic cylinder through a reversing valve to push the cylinder barrel to extend out along the length direction of the piston rod, an
Oil pumped by the hydraulic pump enters a rod cavity of the hydraulic cylinder through the reversing valve so as to push the cylinder barrel to retract along the length direction of the piston rod.
9. The electro-hydraulic control method with self-leveling function as claimed in claim 8, wherein the step of pumping oil from the hydraulic pump into the rodless chamber of the hydraulic cylinder through the directional valve comprises:
oil pumped by the hydraulic pump sequentially enters the rodless cavity through the reversing valve and the extended oil way in the piston rod.
10. The electro-hydraulic control method with self-leveling function as claimed in claim 8, wherein the step of pumping oil from the hydraulic pump into the rod chamber of the hydraulic cylinder through the directional valve comprises:
and oil pumped out by the hydraulic pump sequentially enters the rod cavity through the reversing valve and a retraction oil way in the piston rod.
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