CN205592226U - Hydraulic pressure proportion switching -over valve failure diagnosis tester - Google Patents

Abstract

The utility model relates to a hydraulic pressure proportion switching -over valve failure diagnosis tester, including the shell, 0 3A pulsewidth modulation output interface, spool displacement decode interface, demonstration and the control unit and circuit board, but on the circuit board installation rechargeable lithium -ion battery, power conversion module, a central processing unit, 0 3A pulsewidth modulation output unit, spool displacement decoding units, the utility model discloses a 0 3A pulsewidth modulation output unit exportable 0 3A pulsewidth modulation drive current, direct control proportion switching -over valve, simultaneously the utility model discloses does the sinusoidal wave primary who is used in case displacement sensor of 5KHz who produces decode through the secondary coil to case displacement sensor, with the accurate position of spool displacement with 0 10v's form is sent and is shown surveyability for a central processing unit and on the screen with instrument or curved form.

Description

Hydraulic proportional reversal valve Fault Diagnosis Testing Instrument

Technical field

This utility model belongs to hydraulic proportional reversal valve field, relates to 4WRE type hydraulic proportional reversal valve, especially It is a kind of hydraulic proportional reversal valve Fault Diagnosis Testing Instrument.

Background technology

At modern industry, metallurgy and machine industry, 4WRE type hydraulic proportional reversal valve is widely used, should The valve core of type, with displacement transducer, needs special matched electric amplification board to drive；One Denier electric amplification board drive part, spool displacement feedback fraction or hydraulic valve body break down, and are difficult to judge event Barrier point；For this feature, this utility model combines the experience of a large amount of field failure judge process, can be to 4WRE Type hydraulic proportional reversal valve carries out breakdown judge and performance test.

Utility model content

In place of the purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that one uses flexibly, carries 4WRE type hydraulic proportional reversal valve Fault Diagnosis Testing Instrument, can quickly judge online production and off-line easily The 4WRE type hydraulic proportional reversal valve fault of maintenance, and it is carried out performance test.

This utility model solves technical problem and be the technical scheme is that

A kind of hydraulic proportional reversal valve Fault Diagnosis Testing Instrument, including shell, 0-3A pulsewidth modulation output interface, Spool displacement decoding interface, display with control unit and circuit board, install on circuit boards chargeable lithium cell, Power transfer module, CPU, 0-3A pulsewidth modulation output unit, spool displacement decoding unit； CPU is connected with 0-3A pulsewidth modulation output unit, spool displacement decoding unit I/O respectively, 0-3A Pulsewidth modulation output unit is connected with 0-3A pulsewidth modulation output interface I/O, spool displacement decoding unit and valve Core displacement decoding interface I/O connects, and CPU output connects display and control unit, chargeable lithium electricity Pond is connected with CPU by power transfer module, and chargeable lithium cell is also respectively connected with spool displacement solution Code interface and 0-3A pulsewidth modulation output interface.

And, described 0-3A pulsewidth modulation output unit includes central processing element U1 and analogue amplifier Chip U4, U1 produce the 2 adjustable pulse-width signals of tunnel dutycycle, the first via connect divider resistance R5, R6；Second tunnel connects divider resistance R8, R9；4 groups of amplifiers are had inside analogue amplifier chip U4, point Not Wei U4:A, U4:B, U4:C, U4:D, resistance R5 connect U4:D input port, U4:D, U5:A With the constant-current source that power amplification field effect transistor Q1 and sample resistance R4 form 0-3A, at proportioning valve coil RLA Upper pulse-width signal stable for generation 0-3A；Resistance R8 connects the input port of U4:C, U4:C, U4:B With the constant-current source that power amplification field effect transistor Q2 and sample resistance R7 form 0-3A, at proportioning valve line after commutation The stable pulse-width signal of 0-3A is produced on circle RLB.

And, described spool displacement decoding unit includes the 5KHz sine wave oscillating circuit mould being sequentially connected with Block, lock-out pulse module, decoding circuit module and change-over circuit module.

And, described 0-3A pulsewidth modulation output interface uses 5 core aviation plugs, and described spool displacement decodes Interface uses 4 core aviation plugs.

And, described chargeable lithium cell uses 24v3000ma/h chargeable lithium battery group, and band charges and crosses stream Protection circuit, is equipped with the constant current charger of pressure limiting 25.2v simultaneously.

And, described display uses serial ports touch screen with control unit, is led to CPU by serial ports Letter.

Advantage of the present utility model and good effect be:

1, this utility model drives electricity by the exportable 0-3A pulsewidth modulation of 0-3A pulsewidth modulation output unit Stream, directly controls proportional reversing valve, and the 5KHz sine wave that this utility model produces simultaneously acts on spool displacement The primary coil of sensor, by the secondary coil of valve core displacement sensor is decoded, accurate by spool displacement Position with the form of 0-± 10v, be sent to CPU and on screen form with instrument or curve show Illustrate, very clear.

2, this utility model is self-powered, uses the most easy to carry, uses advanced touch screen technology, entirely Chinese display and built-in description, simple to operate, easy-to-understand, easy to learn.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model；

Fig. 2 is that circuit of the present utility model connects block diagram；

Fig. 3 is the circuit connection diagram of 0-3A pulsewidth modulation output unit；

Fig. 4 is that the circuit of spool displacement decoding unit connects block diagram；

Fig. 5 is use connection figure of the present utility model.

Detailed description of the invention

The utility model is described in further detail below in conjunction with the accompanying drawings and by specific embodiment, and following example are only It is illustrative, is not determinate, it is impossible to limit protection domain of the present utility model with this.

A kind of 4WRE type hydraulic proportional reversal valve Fault Diagnosis Testing Instrument, adjusts including shell 7,0-3A pulsewidth Output interface 3 processed, spool displacement decoding interface 5, display and control unit 4 and circuit board 1, at circuit board Upper installation chargeable lithium cell 8, power transfer module 9, CPU (CPU) 10,0-3A arteries and veins Wide modulation output unit 2, spool displacement decoding unit 6；As shown in Figure 1.CPU respectively with 0-3A Pulsewidth modulation output unit, spool displacement decoding unit I/O connect, 0-3A pulsewidth modulation output unit and 0-3A Pulsewidth modulation output interface I/O connects, and spool displacement decoding unit is connected with spool displacement decoding interface I/O. CPU output connects display and control unit.Chargeable lithium cell group by power transfer module with in Central Processing Unit connects, and powers for CPU.Meanwhile, chargeable lithium cell is also respectively connected with spool position Move decoding interface and 0-3A pulsewidth modulation output interface, be that 4WRE type hydraulic proportional to be measured commutates by interface Valve and displacement transducer are powered.As shown in Figure 2.

Described 0-3A pulsewidth modulation output interface uses 5 core aviation plugs, described spool displacement decoding interface to adopt With 4 core aviation plugs.

CPU (CPU) uses domestic STC single-chip microcomputer, and the PCA within single-chip microcomputer is used for exporting Pulsewidth modulation (PWM) signal, the analog input port of single-chip microcomputer is used for processing spool displacement decoding unit Data.

0-3A pulsewidth modulation output unit includes that central processing element U1 and analogue amplifier chip U4, U1 produce The raw adjustable pulse-width signal of 2 tunnel dutycycle (PWM), first via signal PCA2 connects divider resistance R5, R6, signal is limited in 0-0.3v by R5, R6；Second road signal PCA1 connection divider resistance R8, Signal is limited in 0-0.3v by R9, R8, R9；4 groups of amplifiers are had inside analogue amplifier chip U4, point Not Wei U4:A, U4:B, U4:C, U4:D, resistance R5 connect U4:D input port, U4:D, U5:A With the constant-current source that power amplification field effect transistor Q1 and sample resistance R4 form 0-3A, at proportioning valve coil RLA Upper pulse-width signal stable for generation 0-3A；Resistance R8 connects the input port of U4:C, U4:C, U4:B With the constant-current source that power amplification field effect transistor Q2 and sample resistance R7 form 0-3A, at proportioning valve line after commutation The stable pulse-width signal of 0-3A is produced on circle RLB；As shown in Figure 3.

Spool displacement decoding unit includes 5KHz sine wave oscillating circuit module, the lock-out pulse mould being sequentially connected with Block, decoding circuit module and change-over circuit module, 5KHz sine wave acts at the beginning of spool displacement feedback coil Level, produces lock-out pulse simultaneously；Synchronized-pulse control decoding circuit is by displacement decoding actual for spool, output ± 10v Signal be converted into 0-5v by change-over circuit, process to CPU calculating, and by actual position signal Screen shows；As shown in Figure 4.Its operation principle is: when spool does not commutates, the displacement of spool Plunger position, in the centre position of spool displacement feedback coil secondary, secondary coil produces size identical with amplitude Sine wave, the relative potentials of such secondary coil outfan is zero, decoding circuit output 0v；Once commutate Valve has displacement, the displacement iron core off-center position of spool, and on secondary coil, generation size and amplitude differ Sine wave, decoding circuit decodes right to positive 10v or 0 to negative 10v of corresponding 0 by phase and amplitude Induction signal.

Chargeable lithium cell uses 24v3000ma/h chargeable lithium battery group, and band charges and current foldback circuit, with The constant current charger of Shi Peibei pressure limiting 25.2v, it is ensured that the safety of user.

Display uses serial ports touch screen with control unit, by serial ports and CPU communication, simultaneously will in The various information of Central Processing Unit show in time, are the man machine interfaces of pure Chinese.

Shell uses aluminium alloy extrusions, oil resistant, elimination electromagnetic interference, is suitable for industry, metallurgy and manufacturing etc. Environment.External tapping all uses waterproof aviation plug, is used for connecting hydraulicdirectional control valve to be tested and displacement sensing Device, meets the breakdown judge under adverse circumstances and testing requirement.

Using method of the present utility model is:

The 5 core aviation plugs 12 of this tester 11 are connected to 4WRE type liquid to be detected by cable 13 Pressure proportional reversing valve 14；By 4 core aviation plugs 17 by being connected to 4WRE type to be detected by cable 16 The displacement transducer 15 of hydraulic proportional reversal valve.Open power supply of the present utility model, according to touch screen say Bright book selects corresponding parameter to test.This utility model has manual test and two kinds of selections of test automatically, User can be carried out according to practical situation；User only needs Setting signal and feedback signal simple analysis, i.e. Can determine whether out it is hydraulic pressure or electrical control fault；As shown in Figure 5.

Above-described is only preferred implementation of the present utility model, it is noted that common for this area For technical staff, on the premise of conceiving without departing from utility model, it is also possible to make some deformation and improvement, These broadly fall into protection domain of the present utility model.

Claims (6)

1. a hydraulic proportional reversal valve Fault Diagnosis Testing Instrument, it is characterised in that: include shell, 0-3A pulsewidth modulation output Interface, spool displacement decoding interface, display and control unit and circuit board, install chargeable lithium cell, power supply on circuit boards Modular converter, CPU, 0-3A pulsewidth modulation output unit, spool displacement decoding unit；CPU is divided It is not connected with 0-3A pulsewidth modulation output unit, spool displacement decoding unit I/O, 0-3A pulsewidth modulation output unit and 0-3A Pulsewidth modulation output interface I/O connects, and spool displacement decoding unit is connected with spool displacement decoding interface I/O, and central authorities process single Unit's output connects display and control unit, and chargeable lithium cell is connected with CPU by power transfer module, chargeable Lithium battery is also respectively connected with spool displacement decoding interface and 0-3A pulsewidth modulation output interface.

Hydraulic proportional reversal valve Fault Diagnosis Testing Instrument the most according to claim 1, it is characterised in that: described 0-3A Pulsewidth modulation output unit includes central processing element U1 and analogue amplifier chip U4, and it is adjustable that U1 produces 2 tunnel dutycycles Pulse-width signal, the first via connects divider resistance R5, R6；Second tunnel connects divider resistance R8, R9；Analogue amplifier core Having 4 groups of amplifiers, respectively U4:A, U4:B, U4:C, U4:D inside sheet U4, resistance R5 connects the input port of U4:D, U4:D, U5:A and power amplification field effect transistor Q1 and the constant-current source of sample resistance R4 composition 0-3A, at proportioning valve coil RLA Upper pulse-width signal stable for generation 0-3A；Resistance R8 connects the input port of U4:C, U4:C, U4:B and power amplification field The constant-current source of effect pipe Q2 and sample resistance R7 composition 0-3A, produces 0-3A stable on proportioning valve coil RLB after commutation Pulse-width signal.

Hydraulic proportional reversal valve Fault Diagnosis Testing Instrument the most according to claim 1, it is characterised in that: described spool position Shifting decoding unit includes the 5KHz sine wave oscillating circuit module being sequentially connected with, lock-out pulse module, decoding circuit module and turns Change circuit module.

Hydraulic proportional reversal valve Fault Diagnosis Testing Instrument the most according to claim 1, it is characterised in that: described 0-3A arteries and veins Wide modulation output interface uses 5 core aviation plugs, described spool displacement decoding interface to use 4 core aviation plugs.

Hydraulic proportional reversal valve Fault Diagnosis Testing Instrument the most according to claim 1, it is characterised in that: described is chargeable Lithium battery uses 24v3000ma/h chargeable lithium battery group, band charging and current foldback circuit, is equipped with the perseverance of pressure limiting 25.2v simultaneously Current charge device.

Hydraulic proportional reversal valve Fault Diagnosis Testing Instrument the most according to claim 1, it is characterised in that: described display with Control unit uses serial ports touch screen, by serial ports and CPU communication.