CN202210222U

CN202210222U - General-purpose electrohydraulic position servo driver

Info

Publication number: CN202210222U
Application number: CN2011203758978U
Authority: CN
Inventors: 倪敬; 邵斌; 蒙臻; 陈国金
Original assignee: Hangzhou Dianzi University
Current assignee: Hangzhou Dianzi University
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-05-02
Anticipated expiration: 2021-09-28

Abstract

The utility model relates to a general-purpose electrohydraulic position servo driver. The conventional electrohydraulic servo system driver mainly adopts a distributed structure. In the general-purpose electrohydraulic position servo driver, an SSI (server side include) converting module is externally connected with an SSI displacement sensor and is used as a driver for preprocessing an input signal; an ARM7 (Advanced RISC Machines 7) core is a core of the driver; an operating panel is a visual interactive operating panel and mainly comprises a liquid crystal display, a keyboard input unit and an LED (light emitting diode) indicator light; a serial port electrical level converting module supplies an external control interface to the driver; a computer can perform real-time data communication with the servo driver and perform precise control on the system through the serial port electrical level converting module; a DA (digital-analog) converting and amplifying module adopts a DA module supplied by the ARM7, and supplies a control electrical signal to a servo valve or a proportional valve; and a light source module is used for supplying power to each module of the driver. The general-purpose electrohydraulic position servo driver is high in integration, convenient to operate and lower in cost, and can be popularized and applied on a large scale.

Description

A kind of universal electro-hydraulic position servo driver

Technical field

The utility model belongs to electronic information technical field, relates to a kind of universal electro-hydraulic position servo driver.

Background technology

21 century Mo, the electrohydraulic servo system development rapidly, and is increasing in the effect of industrial control field performance.Electrohydraulic servo system is the feedback control system that a kind of electric device and hydraulic actuating mechanism combine, and modal have electro-hydraulic position servo system, electric liquid speed control system and an electric hydraulic control system.Electrohydraulic servo system as controlled quentity controlled variable, mainly solves the problem of following of controlled quentity controlled variable with the output quantity of topworks, under the prerequisite that guarantees enough accuracy, realizes the timely tracking of controlled quentity controlled variable to specified rate, so electrohydraulic servo system is claimed servomechanism again.Hydraulic actuating mechanism commonly used has hydraulic cylinder and oil motor.

Present electrohydraulic servo system driver mainly still adopts distributed frame, and concrete implementation has the integrated data collection and handles the industrial computer pattern of integrated circuit board and the single-chip microcomputer pattern of integrated high-speed high-precision AD chip.The weak point of these driver implementations is: one of which; The AD conversion precision of hydraulic cylinder displacement signal is limited, the Displacement Feedback of incompatible long stroke hydraulic cylinder, for example 16 Precision A chips; Reach 0.01mm Displacement Feedback precision, hydraulic cylinder travel can only be limited in the 600mm; Its two, the high precision of AD conversion and the requirement of high speed property make driver realize difficulty, satisfy the 1ms switching rate simultaneously and 16 above accuracy A D chips are also fewer, cost is higher; They are three years old; The employing distributed frame is built; Require the technician must have higher hardware and software basis, for example adopt the industrial computer pattern, then need technician's acquaint with data capture card and industrial computer programming application technology; For example adopt the single-chip microcomputer pattern, then need the technician to be familiar with SCM system hardware and software programming application technology.In sum, above not enough big limitations the Servo Drive The Application of Technology.Application number is 200710125448.6 patent servo controller; Through the closed-loop control unit; Driver element, the single-chip microcomputer setup unit has been realized the closed-loop control of servo-drive system, system operational parameters need be set through mcu programming; Increase layman's operation easier, be unfavorable for promoting the use of of servo controller.

Summary of the invention

The utility model purpose is to provide a kind of universal electro-hydraulic position servo driver.

The technical scheme that the utility model technical solution problem is adopted is:

Universal electro-hydraulic position servo driver comprises that SSI modular converter, ARM7 core, serial ports level switch module, DA change amplification module, power module and guidance panel.

The external SSI displacement transducer of described SSI modular converter connects, and as the pre-process of driver to input signal, the synchronous serial signal is converted into the asynchronous serial signal that driver can be handled.

Described ARM7 core is the core of driver, and it is used for the processing of input signal and produces the storage of exporting signal, systematic parameter.

Described guidance panel is a Visual Interactive operation interface; Mainly form by liquid crystal display, keyboard input and LED light; Liquid crystal display is used for the running status and the real-time parameter of display driver, and the handled easily personnel grasp the running status of system and carry out next step operation; Keyboard input makes things convenient for the user that the operational factor of the servo-drive system branch parameter of classifying is specifically set; LED light real-time prompting system running state.

Described serial ports level switch module is that driver provides external control interface, and computing machine can be realized the real-time Communication for Power of data and the accurate control of system to servo-driver through the serial ports level switch module.

The DA module that described DA conversion amplification module adopts ARM7 self to provide, the output signal is the 0-10v voltage signal of standard or the current signal of 4-20ma, for servo-valve or proportioning valve provide the control electric signal.

Described power module input power supply is supplied power by single-phase alternating current, and input voltage is 220V, and output dc voltage 3.3V and 24V are used for power supply to each module of driver being provided.

The utility model has following beneficial effect than prior art: compare the Traditional use analog-to-digital conversion module, the SSI module that is integrated in driver has improved the resolution of input signal, and resolution can reach 25 and be precision, and has reduced installation cost; The guidance panel of driver has made things convenient for the user to the setting of driver operational factor with check, and is simple to operation, intuitive display; The adding of serial ports level switch module has made things convenient for the expansion of communicating by letter of industrial control computer and driver and driver functions; Compare and realize the control of electro-hydraulic position servo system with programmable logic controller (PLC) and computer combined, the utility model is simpler, and integrated degree is higher, and easy to operate, and cost is lower, helps promoting the use of on a large scale.

Description of drawings

Fig. 1 is the driver interface arrangenent diagram;

Fig. 2 is the drive faceplate arrangenent diagram;

Fig. 3 is the drive system schematic diagram;

Among the figure: 1, LED light; 2, setup parameter; 3, real-time parameter; 4, button upwards; 5, operation button; 6, to knob down; 7, stop button; 8, alarm lamp; 9, mode conversion switch; 10, confirming button; 11, mode button.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, a kind of integrated-type driver that collects Displacement Feedback, PID computing and control output of one, its external interface that provides is following:

The SSI conversion module directly links to each other with external displacement SSI sensor, clock+ wherein, and clock-is a clock signal; Data+; Data-is a data-signal, and 24VDC, GND are that driver is the power interface that displacement transducer provides; The SSI conversion module is once exported 8 bit data, and sensor accuracy is more than 8 transmission several times.

DA conversion amplification module is integrated among the ARM7; Precision is 10; The output signal type is the 2-20ma current signal of standard or the voltage signal of 0-10V, and above-mentioned output signal directly is connected with servo-valve, can carry out servocontrol to hydraulic actuating mechanism through servo-valve.

The serial ports level switch module is used for the 3V WV that the 3.3V voltage signal that ARM7 is inner is converted into module, and the P0.0 of ARM7 is used for the transmission of serial data, and P0.1 is used for the reception of serial data, and the standard serial port data line of the output of module and 9 pins is connected.

Power module input power supply is supplied power by single-phase alternating current, and input voltage is 220V, and output dc voltage 3.3V and 24V are used for power supply to each module of driver being provided.

Guidance panel is made up of liquid crystal display, keyboard input and LED light three parts.The port P0.27-P1.22 of ARM7 connects LCD MODULE, and the word control signal and position control signal of charactron is provided, and the multidigit nixie tube of LCD MODULE and guidance panel is connected, and is used for the running status and the real-time parameter of display driver; 7 buttons on the keyboard load module attended operation panel, the control signal of respectively corresponding 7 buttons of the port P0.20-P0.26 of ARM7.The LED light module is used for the pilot lamp on the display operating panel by the port P1.23-P1.30 control of ARM7.

As shown in Figure 2, guidance panel provides a visual interactive operation interface to operating personnel, mainly is made up of liquid crystal display, keyboard input and LED light three parts:

Liquid-crystal display section is used for the setup parameter 2 and real-time parameter 3 of display driver, and setup parameter 2 comprises the starting position, final position etc.; Real-time parameter 3 comprises displacement, speed, acceleration etc.; Can switch to knob down 6 through the button 4 that makes progress between the different parameters.

Key input section comprises 6 buttons and a mode conversion switch 9.6 buttons are respectively: mode button 11, upwards button 4, operation button 5, stop button 7, to knob down 6, confirming button 10.Pattern selects button 11 to be used to select different setup parameters; Upwards button 4 shows a last setup parameter or carries out the value setting of parameter; Show next setup parameter or carry out the value setting of parameter to knob down 6; Confirming button 10 is used to confirm parameter of user; The parameter setting of operation button 5 excited users also drives driver, and when pressing operation button 5, driver is started working; Stop button 7 stops the operation of driver, and when pressing stop button 7, driver quits work; The operational mode that the operational mode of system model switch 9 conversion drivers, driver offer the user has automatically and manual two kinds;

The operational mode and the state of LED light 1 prompt system, system running pattern have automatically and manual two kinds, move and stop the running status that LED light is used to point out system, the direction of motion of forward and reverse LED light prompting hydraulic actuating mechanism.Alarm lamp 8 is used for the state of prompt system, and when system made mistakes, alarm lamp 8 was lighted, and driver is sounded a buzzer.

As shown in Figure 3, the system principle of driver is following:

At first, the user utilizes guidance panel that systematic parameter is set, and the user utilizes mode conversion switch (9) to select the driver operational mode, treat parameter setting after, press operation button (5), driver is started working.

Then; Driver utilizes 25 high-precision SSI displacement transducers to gather the actual displacement signal; The ARM7 core that output signal Pv gives driver, the theoretical displacement Sp of output signal Pv and automation curve generator or manually curve generator output compares generated error signal Er; The PID computing module of finishing in advance in the system is through the processing to error signal Er; Calculate to generate output signal PIDout, output signal PIDout need pass through the voltage U out or the current signal Iout of the standard that generates after the digital-to-analogue processing and amplifying, thereby driving mechanisms such as control servo-valve carry out real-time servocontrol to the position of topworkies such as hydraulic cylinder.

At last, the position signalling of topworks is again by the collection of SSI displacement transducer and get into Control Circulation next time.

Claims

1. universal electro-hydraulic position servo driver comprises that SSI modular converter, ARM7 core, serial ports level switch module, DA change amplification module, power module and guidance panel, is characterized in that:

The external SSI displacement transducer of described SSI modular converter connects, and as the pre-process of driver to input signal, the synchronous serial signal is converted into the asynchronous serial signal that driver can be handled;

Described ARM7 core is the core of driver, and it is used for the processing of input signal and produces the storage of exporting signal, systematic parameter;

Described guidance panel is a Visual Interactive operation interface; Mainly form by liquid crystal display, keyboard input and LED light; Liquid crystal display is used for the running status and the real-time parameter of display driver, and the handled easily personnel grasp the running status of system and carry out next step operation; Keyboard input makes things convenient for the user that the operational factor of the servo-drive system branch parameter of classifying is specifically set; LED light real-time prompting system running state;

Described serial ports level switch module is that driver provides external control interface, and computing machine can be realized the real-time Communication for Power of data and the accurate control of system to servo-driver through the serial ports level switch module;

The DA module that described DA conversion amplification module adopts ARM7 self to provide, the output signal is the 0-10v voltage signal of standard or the current signal of 4-20ma, for servo-valve or proportioning valve provide the control electric signal;