CN111706574A - Hydraulic control system and control method thereof - Google Patents

Hydraulic control system and control method thereof Download PDF

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Publication number
CN111706574A
CN111706574A CN202010742171.7A CN202010742171A CN111706574A CN 111706574 A CN111706574 A CN 111706574A CN 202010742171 A CN202010742171 A CN 202010742171A CN 111706574 A CN111706574 A CN 111706574A
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CN
China
Prior art keywords
hydraulic
oil
motor
load
control system
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Pending
Application number
CN202010742171.7A
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Chinese (zh)
Inventor
王晓
陈波
王轶
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Jiangsu Dongshun New Energy Technology Co ltd
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Jiangsu Dongshun New Energy Technology Co ltd
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Filing date
Publication date
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Priority to CN202010742171.7A priority Critical patent/CN111706574A/en
Publication of CN111706574A publication Critical patent/CN111706574A/en
Pending legal-status Critical Current

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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18—Combined units comprising both motor and pump
    • 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
    • F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves
    • 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
    • F15B13/16—Special measures for feedback, e.g. by a follow-up device
    • 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
    • F15B21/087—Control strategy, e.g. with block diagram
    • 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
    • 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
    • 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
    • F15B2211/25—Pressure control functions
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load pressure
    • 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
    • F15B2211/605—Load sensing circuits
    • 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
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • 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
    • F15B2211/75—Control of speed of the output member
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/88—Control measures for saving energy

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention discloses a hydraulic control system and a control method thereof, the hydraulic control system comprises an oil tank, a hydraulic pump, an oil supply pipeline and a hydraulic motor, wherein the oil inlet end of the hydraulic pump is communicated with the oil tank, one end of the oil supply pipeline is communicated with the oil outlet end of the hydraulic pump, the oil inlet of the hydraulic motor is communicated with the other end of the oil supply pipeline, the oil outlet of the hydraulic motor is communicated with the oil tank through an oil return pipeline, the hydraulic pump is connected with a variable frequency motor for driving the hydraulic motor to operate, the oil supply pipeline is provided with an overflow valve and a hydraulic reversing valve, the overflow valve is communicated with the oil tank through an overflow pipeline, the regulation is.

Description

Hydraulic control system and control method thereof
Technical Field
The invention relates to a hydraulic control system and a control method thereof.
Background
As shown in fig. 1, a hydraulic control system in the prior art includes an oil tank, a hydraulic pump whose oil inlet end is communicated with the oil tank, an oil supply pipeline whose one end is communicated with the oil outlet end of the hydraulic pump, and a hydraulic motor whose oil inlet is communicated with the other end of the oil supply pipeline, wherein the oil outlet of the hydraulic motor is communicated with the oil tank through an oil return pipeline, the oil supply pipeline is provided with an overflow valve, a hydraulic directional valve and a flow control valve, and the overflow valve is communicated with the oil tank through an overflow pipeline.
When the hydraulic control system in the prior art works, a corresponding power system needs to be established firstly, for example, the maximum oil pressure for driving a load is set to be 100kg/cm2Therefore, the oil pressure in the oil supply line of the entire hydraulic system is 100kg/cm2Therefore, the oil supply pressure of the hydraulic pump must be more than 100kg/cm2Therefore, the redundant oil quantity returns to the oil tank through the overflow valve, the flow regulating valve is used for regulating when the rotating speed of the hydraulic motor is regulated, the hydraulic reversing valve controls the forward rotation or the reverse rotation of the hydraulic motor, but the oil pressure required by driving the load is less than 100kg/cm in the actual use process2And the whole hydraulic control system is still full load to supply oil, which greatly wastes energy, and the oil temperature rises and generates heat to cause loss phenomenon.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a hydraulic control system and a control method thereof, which are convenient to adjust, save energy and greatly reduce loss.
In order to realize the technical effects, the technical scheme of the invention is as follows: the utility model provides a hydraulic control system, including oil tank, inlet end with hydraulic pump that the oil tank is linked together, one end with the delivery line that the delivery end of hydraulic pump is linked together, oil inlet and the hydraulic motor that the other end of delivery line is linked together, hydraulic motor's oil-out through return oil pipe with oil tank case intercommunication, be connected with its moving inverter motor of drive on the hydraulic pump, be provided with overflow valve and hydraulic reversing valve on the delivery line, the overflow valve pass through the overflow pipeline with the oil tank is linked together.
In a further refinement, the hydraulic pump is a plunger pump.
The hydraulic control system is characterized in that a detection unit for detecting the rotating speed of the hydraulic motor is arranged at the output end of the hydraulic motor, the detection unit is electrically connected with a frequency converter of the variable frequency motor, or the detection unit is electrically connected with a controller of the hydraulic control system, and the controller is electrically connected with the variable frequency motor.
In a further refinement, the detection unit is an encoder.
The further improvement is that the plunger pump is a plunger pump with a pressure limiting function.
In order to achieve the technical effects, another technical scheme of the invention is as follows: a control method of a hydraulic control system is characterized in that when a load is not changed, the rotating speed of a variable frequency motor is adjusted according to the oil pressure required by a hydraulic motor to drive the load, so that a hydraulic pump keeps constant oil supply pressure and is the same as the oil pressure required by the hydraulic motor to drive the load, the constant rotating speed of the hydraulic motor is ensured, and the hydraulic motor is adjusted to rotate forwards or backwards through adjusting a hydraulic reversing valve; when the load is reduced, detecting the rotating speed of the load according to an encoder at the output end of the hydraulic motor, converting the rotating speed of the load into an electric signal and sending the electric signal to a frequency converter or a controller, wherein the rotating speed of the load is greater than a set rotating speed, the controller or the frequency converter controls a variable frequency motor to reduce the rotating speed, and a hydraulic pump reduces the oil supply pressure; when the load grow, the rotational speed of load is detected according to the encoder of hydraulic motor output and is turned into the signal of telecommunication with it and send for converter or controller, and the load rotational speed is less than the settlement rotational speed this moment, and controller or converter control inverter motor increase the rotational speed, and the hydraulic pump increases fuel feeding pressure, and when the oil pressure in the oil supply pipe exceeded the settlement pressure of overflow valve, the overflow valve was opened and is carried out the pressure release.
The invention has the advantages and beneficial effects that: the direct plunger pump of control through inverter motor provides the required oil pressure of hydraulic motor drive load, need not full load operation in the whole hydraulic system, not only energy saving, reduces the loss that oil generated heat moreover, in addition when adjusting the hydraulic motor rotational speed direct control inverter motor can, it is convenient to adjust.
Drawings
FIG. 1 is a prior art schematic;
fig. 2 is a schematic diagram of the present invention.
In the figure: 1. an oil tank; 2. a hydraulic pump; 3. a hydraulic motor; 4. a variable frequency motor; 5. an overflow valve; 6. a hydraulic directional control valve; 7. a detection unit.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 2, the hydraulic control system of the embodiment includes an oil tank 1, a hydraulic pump 2 whose oil inlet end is communicated with the oil tank 1, an oil supply pipeline whose one end is communicated with the oil outlet end of the hydraulic pump 2, an oil inlet and a hydraulic motor 3 whose other end is communicated with the oil supply pipeline, the oil outlet of the hydraulic motor 3 is communicated with the oil tank 1 through an oil return pipeline, the hydraulic pump 2 is connected with a variable frequency motor 4 for driving the hydraulic motor to operate, the oil supply pipeline is provided with an overflow valve 5 and a hydraulic directional valve 6, and the overflow valve 5 is communicated with the oil tank 1 through an overflow pipeline.
In the preferred embodiment of the present invention, the hydraulic pump 2 is a plunger pump, and since the plunger pump has high rated pressure and high rotation speed, the driving power of the pump is high; the efficiency is high, the volumetric efficiency is about 95%, and the total efficiency is about 90%; the service life is long; the variable is convenient, and the forms are many; the weight per unit power is light; the main parts of the plunger pump are all stressed, and the strength performance of the material can be fully utilized.
In order to realize automatic control, in this embodiment, a preferred embodiment is that a detection unit 7 for detecting a rotation speed of the hydraulic motor 3 is disposed at an output end of the hydraulic motor, the detection unit 7 is electrically connected to a frequency converter of the variable frequency motor 4, or the detection unit 7 is electrically connected to a controller of a hydraulic control system, and the controller is electrically connected to the variable frequency motor 4, and preferably, the detection unit 7 is an encoder.
In order to further protect the whole hydraulic system, the plunger pump is a plunger pump with a pressure limiting function and is matched with an overflow valve 5 to form double protection, so that the whole hydraulic system runs stably.
A control method of a hydraulic control system, specifically, the oil pressure required by driving a load is 80kg/cm2The rotating speed of the variable frequency motor 4 is adjusted according to the oil pressure required by the hydraulic motor 3 to drive the load, so that the constant oil supply pressure of the hydraulic pump 2 is kept at 80kg/cm2The maximum oil supply pressure of the entire hydraulic control system is set by setting the relief valve 5 to, for example, 100kg/cm2At the moment, the overflow valve 5 does not produce return oil, the variable frequency motor 4 does not need to work under full load, oil heating can be reduced, loss can be reduced, and the hydraulic motor 3 is adjusted to rotate forwards or backwards through adjusting the hydraulic reversing valve 6; when the oil pressure for driving the load becomes small, 60kg/cm is required2Detecting the rotating speed of the load according to an encoder at the output end of the hydraulic motor 3, converting the rotating speed of the load into an electric signal and sending the electric signal to the frequency converter or the controller, wherein the rotating speed of the load is greater than the set rotating speed, and the controller or the frequency converter controls the variable frequency motor 4 to reduce the rotating speed until the oil supply pressure of the hydraulic pump 2 is 60kg/cm2The adjustment is convenient; when the load becomes bigger, the rotating speed of the load is detected according to an encoder at the output end of the hydraulic motor 3, the rotating speed is converted into an electric signal to be sent to the frequency converter or the controller, the rotating speed of the load is smaller than the set rotating speed, the controller or the frequency converter controls the variable frequency motor 4 to increase the rotating speed, in addition, when the oil pressure required by the load exceeds the load of the whole hydraulic control system, the overflow valve 5 is opened to release the pressure, and therefore the stable operation of the whole hydraulic control system is ensured.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (6)

1. The utility model provides a hydraulic control system, its characterized in that, including oil tank, inlet end with hydraulic pump that the oil tank is linked together, one end with the delivery line that the delivery end of hydraulic pump is linked together, oil inlet with the hydraulic motor that the other end of delivery line is linked together, hydraulic motor's oil-out through return oil pipe way with oil tank case intercommunication, be connected with its moving inverter motor of drive on the hydraulic pump, be provided with overflow valve and hydraulic reversing valve on the delivery line, the overflow valve pass through the overflow pipeline with the oil tank is linked together.
2. The hydraulic control system of claim 1, wherein the hydraulic pump is a plunger pump.
3. The hydraulic control system according to claim 1, wherein the output end of the hydraulic motor is provided with a detection unit for detecting the rotation speed of the hydraulic motor, and the detection unit is electrically connected with a frequency converter of the variable frequency motor, or the detection unit is electrically connected with a controller of the hydraulic control system, and the controller is electrically connected with the variable frequency motor.
4. The hydraulic control system of claim 3, wherein the detection unit is an encoder.
5. The hydraulic control system of claim 2, wherein the plunger pump is a plunger pump with a pressure limiting function.
6. A control method of a hydraulic control system is characterized in that when a load is not changed, the rotating speed of a variable frequency motor is adjusted according to the oil pressure required by a hydraulic motor to drive the load, so that a hydraulic pump keeps constant oil supply pressure and is the same as the oil pressure required by the hydraulic motor to drive the load, the constant rotating speed of the hydraulic motor is ensured, and the hydraulic motor is adjusted to rotate forwards or backwards through adjusting a hydraulic reversing valve; when the load is reduced, detecting the rotating speed of the load according to an encoder at the output end of the hydraulic motor, converting the rotating speed of the load into an electric signal and sending the electric signal to a frequency converter or a controller, wherein the rotating speed of the load is greater than a set rotating speed, the controller or the frequency converter controls a variable frequency motor to reduce the rotating speed, and a hydraulic pump reduces the oil supply pressure; when the load grow, the rotational speed of load is detected according to the encoder of hydraulic motor output and is turned into the signal of telecommunication with it and send for converter or controller, and the load rotational speed is less than the settlement rotational speed this moment, and controller or converter control inverter motor increase the rotational speed, and the hydraulic pump increases fuel feeding pressure, and when the oil pressure in the oil supply pipe exceeded the settlement pressure of overflow valve, the overflow valve was opened and is carried out the pressure release.
CN202010742171.7A 2020-07-29 2020-07-29 Hydraulic control system and control method thereof Pending CN111706574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010742171.7A CN111706574A (en) 2020-07-29 2020-07-29 Hydraulic control system and control method thereof

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Application Number Priority Date Filing Date Title
CN202010742171.7A CN111706574A (en) 2020-07-29 2020-07-29 Hydraulic control system and control method thereof

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CN111706574A true CN111706574A (en) 2020-09-25

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CN202010742171.7A Pending CN111706574A (en) 2020-07-29 2020-07-29 Hydraulic control system and control method thereof

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112710342A (en) * 2020-12-14 2021-04-27 重庆交通大学 Universal calibration device for fluid multi-parameter detection instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112710342A (en) * 2020-12-14 2021-04-27 重庆交通大学 Universal calibration device for fluid multi-parameter detection instrument

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