CN111306143B - Intelligent calibration device and method for steady-state hydraulic power of proportional valve spool - Google Patents
Intelligent calibration device and method for steady-state hydraulic power of proportional valve spool Download PDFInfo
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- CN111306143B CN111306143B CN202010268640.6A CN202010268640A CN111306143B CN 111306143 B CN111306143 B CN 111306143B CN 202010268640 A CN202010268640 A CN 202010268640A CN 111306143 B CN111306143 B CN 111306143B
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- valve core
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Magnetically Actuated Valves (AREA)
Abstract
The present invention relates to proportional valves. The invention relates to an intelligent calibration device and method for steady-state hydraulic power of a proportional valve spool, which is characterized in that a proportional valve with a valve controller is arranged on a mounting table of a pressure-adjustable hydraulic system valve; the calibration circuit board is connected with the valve controller, and the D/A module on the circuit board sends a position instruction to the valve controller to control the valve controller at a target position and receives a valve core position fed back by valve control and a current signal of the proportional valve through the A/D module; the circuit board is programmed by adopting a single chip microcomputer or other microprocessors, a program processes acquired signals to obtain the hydraulic power of a measuring point, and sends a position instruction signal of the next measuring point until the hydraulic power of all measuring points is measured, and at the moment, the calibration circuit board sends measured data to a computer in a serial port communication or bus communication mode and the like. The invention can automatically calibrate the size of the hydraulic power without disassembling the proportional valve body.
Description
Technical Field
The invention relates to a proportional valve, in particular to the calibration of the steady-state hydrodynamic force of a valve core of the proportional valve.
Background
Hydrodynamic force: the proportional valve controls the opening of the valve port to change through the movement of the valve core, and when continuously flowing oil passes through the valve port, the direction and the speed are changed, the oil forms hydrodynamic force on the valve core, so that the valve port is closed. The opening of the valve port of the proportional valve is controlled by the position of the valve core, and the valve core is mainly subjected to three forces in the motion direction, namely pushing or pulling force of the electromagnet, force of the biasing spring and hydraulic force. When the valve core is stabilized at a certain position and the opening of the valve port is kept unchanged, the valve core is in a stress balance state. The push or pull force of the electromagnet can be obtained through a diagram spectrum of external characteristics calibrated in advance (obtained by looking up a table through a valve core position signal and an electromagnet current signal), and the force of the biasing spring can be obtained through calculation of spring deformation and spring stiffness (the spring deformation is related to valve core displacement). The value of the liquid outlet power can be deduced through a three-force balance calculation formula according to the calculated push or pull force and spring force of the electromagnet.
Most of the existing force measurement technologies are in direct contact measurement with a measured object, and the hydraulic force of the valve core cannot be measured in an experimental measurement mode, so that the proportional valve structure cannot be detached for measurement, and the valve body structure cannot be changed for measurement.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an intelligent calibration device and method for steady-state hydraulic power of a valve core of a proportional valve. The invention can automatically calibrate the size of the hydraulic power without disassembling the proportional valve body.
The invention relates to an intelligent calibration device for steady-state hydraulic power of a valve core of a proportional valve, wherein the proportional valve comprises a valve body and a valve controller, the proportional valve comprises a hydraulic pump for pumping oil from an oil tank to the proportional valve, a pressure sensor and an overflow valve are arranged at the outlet of the hydraulic pump, the outlet of the proportional valve forms an oil loop through a throttle valve, the valve controller is connected with a circuit board with a PC and is controlled by the circuit board, and the circuit board mainly comprises a microprocessor chip, an A/D module and a D/A module, so that signal acquisition is realized, and the signal acquisition is communicated with the PC.
The intelligent calibration method for the steady-state hydrodynamic force of the proportional valve spool comprises the following steps:
firstly, calibrating a hydraulic valve core displacement curve under the pressure after the pressure of a system is set; when the calibration circuit board collects the position designation and enables the valve core to be stabilized at the position of the point to be measured through a valve controller of the proportional valve, the calibration circuit board starts to collect a valve core position signal and a current signal;
step two, according to a calculation method which is pre-programmed into the circuit board, the value of the hydrodynamic force borne by the valve core in a stress balance state is calculated by combining the pre-input required basic data;
step three, the calibration circuit board sends out a command signal for changing the position of the valve core, and the hydraulic force is measured at other positions again, so that a curve of the valve core hydraulic force as the position under the pressure condition is finally obtained;
and step four, changing the system pressure, repeating the steps to obtain the hydrodynamic force under different pressures, and finally drawing a map of the hydrodynamic force of the valve core under the influence of the position and the pressure of the valve core.
According to the intelligent calibration method for the steady-state hydrodynamic force of the proportional valve spool, the required basic data input in advance in the second step comprise a force characteristic map of the electromagnet, the spring stiffness and the spring pre-tightening force.
The second step of the intelligent calibration method for the steady-state hydrodynamic force of the proportional valve spool is a calculation method pre-programmed into the circuit board, and comprises the following steps:
A. setting valve port pressure to divide the valve core position into N positionsiAre respectively counted as n1，n2，n3……nn；
B. Positioning the valve core at a certain position to obtain a valve core position signal and an electromagnet electric signal;
judging niWhether the value is less than or equal to N, if not, jumping to E, and if so, jumping to E
C. Calculating the pushing force or the pulling force of the electromagnet, calculating the spring force, calculating the hydrodynamic force of the measuring point according to the stress balance,
D. moving the spool to ni+1Position, repeat B and C up to niIs greater than N;
E. and transmitting all data to a PC (personal computer), and drawing a valve core hydraulic power valve core position curve.
The electrical signal comprises a current signal or a voltage signal.
The invention utilizes the characteristic of balanced stress of the valve core, acquires and calculates and processes required signals through digital hardware such as a single chip microcomputer and the like, and realizes the automatic calibration process of hydraulic power to a certain extent.
The invention realizes the indirect measurement of the hydraulic force of the valve core, solves the problem of difficult direct measurement of the hydraulic force, and can realize the effective measurement of the hydraulic force under the condition of not reforming the structure of the proportional valve because the formation of the hydraulic force needs to form a closed cavity.
On the other hand, the invention realizes the automatic calibration process of the hydraulic power, the circuit board capable of being calibrated is adopted to send out an instruction so that the position of the valve core is changed once according to the preset setting, and the position signal and the current signal of the corresponding measuring point are collected and responded, and the automatic calculation is realized by programming so as to obtain the hydraulic power of the instruction measuring point. And finally, drawing a hydrodynamic map of the valve core.
Drawings
FIG. 1 is a schematic diagram of an intelligent calibration device for steady-state hydrodynamic force of a proportional valve spool.
FIG. 2 is a flow chart of an intelligent calibration method for steady-state hydrodynamic force of a proportional valve spool.
Detailed Description
Referring to the attached drawings, in the drawing, 1 is a hydraulic pump, 2 is a pressure sensor, 3 is a proportional valve, 4 is a throttle valve, 5 is a valve controller, 6 is a circuit board for calibration, 7 is a PC, 8 is an overflow valve, and 9 is an oil tank.
As shown in figure 1, the invention mainly depends on a single chip microcomputer system with signal acquisition and communication functions as shown in figure 1, the acquired signals are calculated in the single chip microcomputer to obtain a hydrodynamic force calibration result and are output to a computer, and the processing flow is shown in figure 2.
Referring to fig. 1, the proportional valve comprises a proportional valve 3 and a valve controller 5, the proportional valve comprises a hydraulic pump 1 for pumping oil from an oil tank 9 to the proportional valve, a pressure sensor 2 and an overflow valve 8 are arranged at the outlet of the hydraulic pump, an oil loop is formed at the outlet of the proportional valve through a throttle valve 4, the valve controller 5 is connected with a circuit board 6 with a PC 7 and is controlled by the circuit board, and the circuit board mainly comprises a microprocessor chip, an a/D module and a D/a module, so that the acquisition of signals is realized and the signals are communicated with the PC.
Installing a proportional valve 3 with a valve controller 5 on a mounting table of a pressure-adjustable hydraulic system valve; the calibration circuit board 6 is connected with the valve controller 6, the D/A module on the circuit board sends a position instruction to the valve controller 6 to control the valve controller 6 at a target position, and receives a valve core position fed back by valve control and a current signal of the proportional valve through the A/D module (if the valve controller does not have current feedback, a current sensor is additionally arranged); the circuit board is programmed by adopting a single chip microcomputer or other microprocessors, a program processes acquired signals to obtain the hydraulic power of a measuring point, and sends a position instruction signal of the next measuring point until the hydraulic power of all measuring points is measured, and at the moment, the calibration circuit board sends measured data to a computer in a serial port communication or bus communication mode and the like.
Fig. 2 is a specific calibration process. Because the hydraulic power is different under different pressures, firstly, the hydraulic power under the pressure is a valve core displacement curve after the pressure of the system is set and then the calibration is started. The circuit board mainly comprises a microprocessor chip, a simple circuit such as an A/D module and a D/A module, and the circuit board can realize signal acquisition and can be used for communicating with a computer and other hardware bases. When the calibration circuit board collects the position designation and enables the valve core to be stabilized at the position of the point to be measured through the valve controller of the proportional valve, the calibration circuit board starts to collect valve core position signals and current signals. According to a calculation method pre-programmed into the circuit board, as shown in fig. 2, the value of the hydrodynamic force applied to the valve core in a stress balance state is calculated by combining pre-input required basic data, such as a force characteristic map of the electromagnet, the spring stiffness, the spring pre-tightening force and the like. And changing the valve core position command signal, and measuring the hydraulic force at other positions again to finally obtain a valve core hydraulic force as a position curve under the pressure condition. And changing the system pressure, repeating the steps to obtain the hydrodynamic force under different pressures, and finally drawing a map of the valve core hydrodynamic force under the influence of the position and the pressure of the valve core.
Claims (2)
1. The calibration method of the intelligent calibration device for the steady-state hydraulic power of the valve core of the proportional valve comprises the proportional valve with a valve controller and a valve body, a hydraulic pump for pumping oil from an oil tank to the proportional valve, a pressure sensor and an overflow valve are arranged at the outlet of the hydraulic pump, an oil loop is formed at the outlet of the proportional valve through a throttle valve, the valve controller is connected with a circuit board with a PC and is controlled by the circuit board, the circuit board mainly comprises a microprocessor chip, an A/D module and a D/A module, and the calibration method comprises the following steps:
firstly, calibrating a hydraulic valve core displacement curve under the pressure after the pressure of a system is set; when the calibration circuit board collects and sends a position instruction and enables the valve core to be stabilized at the position of a point to be measured through a valve controller of the proportional valve, the calibration circuit board starts to collect a valve core position signal and an electric signal;
step two, according to a calculation method which is pre-programmed into the circuit board, the value of the hydrodynamic force borne by the valve core in a stress balance state is calculated by combining the pre-input required basic data; the method comprises the following specific steps:
A. setting valve port pressure to divide the valve core position into N positionsiAre respectively counted as n1，n2，n3……nn；
B. Positioning the valve core at a certain position to obtain a valve core position signal and an electromagnet current signal;
judging niWhether the value is less than or equal to N, if not, jumping to E, and if so, jumping to E
C. Calculating the pushing force or the pulling force of the electromagnet, calculating the spring force, calculating the hydrodynamic force of the measuring point according to the stress balance,
D. moving the spool to ni+1Position, repeat B and C up to niIs greater than N;
E. all data are transmitted to a PC, and a valve core hydraulic power valve core position curve is drawn;
and step three, changing the system pressure, repeating the steps to obtain the hydrodynamic force under different pressures, and finally drawing a map of the hydrodynamic force of the valve core under the influence of the position and the pressure of the valve core.
2. The calibration method of the intelligent calibration device for the steady-state hydrodynamic force of the valve element of the proportional valve as claimed in claim 1, wherein the required basic data pre-input in the second step comprise a force characteristic map of an electromagnet, spring stiffness and spring pre-tightening force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010268640.6A CN111306143B (en) | 2020-04-08 | 2020-04-08 | Intelligent calibration device and method for steady-state hydraulic power of proportional valve spool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010268640.6A CN111306143B (en) | 2020-04-08 | 2020-04-08 | Intelligent calibration device and method for steady-state hydraulic power of proportional valve spool |
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| CN111306143A CN111306143A (en) | 2020-06-19 |
| CN111306143B true CN111306143B (en) | 2022-01-18 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3001886A1 (en) * | 1980-01-19 | 1981-07-23 | G.L. Rexroth Gmbh, 8770 Lohr | HYDRAULIC CONTROL AND / OR MEASURING DEVICE, ESPECIALLY ELECTRICALLY CONTROLLABLE CURRENT VALVE |
| SU1242731A1 (en) * | 1984-10-12 | 1986-07-07 | Предприятие П/Я В-8670 | Method of determining flow force of stop-actuator element of valve |
| CN108679026B (en) * | 2018-07-17 | 2019-05-17 | 浙江大学 | A kind of multiple-sensor integration formula intelligent control proportional reversing valve and its control method |
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