CN207395763U - A kind of numeric type two-wire system axial displacement pick-up table - Google Patents
A kind of numeric type two-wire system axial displacement pick-up table Download PDFInfo
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- CN207395763U CN207395763U CN201720981750.0U CN201720981750U CN207395763U CN 207395763 U CN207395763 U CN 207395763U CN 201720981750 U CN201720981750 U CN 201720981750U CN 207395763 U CN207395763 U CN 207395763U
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Abstract
The utility model belongs to technology of instrument and meter field, is related to a kind of numeric type two-wire system axial displacement pick-up table, for rotating machinery vibrating monitoring of equipment and equipment protection occasion；It solves the ineffective of Real Time Monitoring pick-up and without USB and HART communication interface, lacks the problem of communication function, multiple sensors system can be docked, signal is carried out to detect in real time, is analyzed, the operation of pick-up, simply and efficiently monitoring management unit equipment；It includes housing, sensor input, current output terminal, original signal Buffer output interface, USB interface and circuit units, the sensor input, current output terminal, original signal Buffer output interface and USB interface are installed on the exterior panel of the housing, circuit unit is arranged at the inside of housing, input/output terminal, the connection of interface power information respectively, with saving cost, easy-to-connect, low-power consumption and strong antijamming capability, market value with good economic efficiency and wide.
Description
Technical field：
The utility model belongs to technology of instrument and meter field, is related to a kind of numeric type pick-up table, especially a kind of numeric type
Two-wire system axial displacement pick-up table can receive the signal input of eddy current sensor, for rotating machinery vibrating monitoring of equipment and set
Standby protection occasion, the rotating machinery vibrating equipment is steam turbine, compressor, motor, pump, fan, air blower, centrifuge and
Generator etc..
Background technology：
Large rotating machinery is the key that the industrial departments power-equipment such as petrochemical industry, electric power, monitors the work of these machines in real time
Make state for ensuring that its safe operation has important directive significance.Rotary machine axle position shift measurement is that one of them is very heavy
The measurement parameters wanted, axial displacement not only can be shown that the operation characteristic and situation of machine, but also can indicate the abrasion of thrust bearing
The possibility to collide between situation and rotatable parts and stationary parts.General axial displacement pick-up table, majority are simulation
Detecting system, it is more complicated, when monitoring large complicated unit there are of high cost, poor reliability, short life, power consumption be big, wiring
The shortcomings of complicated, without communication interface.In the prior art, Chinese patent CN204807099U discloses a kind of two-wire system axial displacement and becomes
Table is sent, is turned including sequentially connected linearizer, filter amplification circuit, analog/digital conversion circuit, central processing unit, D/A
Circuit and current output circuit are changed, the input terminal of the linearizer is equipped with sensor input, the linearizer
Input terminal connect the output terminal of an oscillating circuit, the output terminal of the current output circuit is equipped with current output terminal and connects
The input terminal of current feedback circuit, the output terminal of the current feedback circuit connect the input terminal of the current output circuit, institute
It states current output circuit and current feedback circuit forms two-wire system V/I converters, cooperation eddy current sensor can be used for automatic inspection
Axial displacement is surveyed, has many advantages, such as to save cost, easy-to-connect, low-power consumption, there is higher reliability, flexibility and anti-interference energy
Power, the normal operation to manage unit equipment provide simple, efficient monitoring scheme, but the effect of Real Time Monitoring pick-up
It also needs perfect, and without USB and HART communication interface, lacks communication function.
The content of the invention：
The purpose of the utility model is to overcome the shortcomings of the prior art, seek to design a kind of numeric type two-wire system axis
Shift transmission table solves the ineffective of Real Time Monitoring pick-up, and without USB and HART communication interface, lacks communication function
Problem, multiple sensors system can be docked, signal is carried out to detect in real time, is analyzed, pick-up, simply and efficiently monitoring management
The normal operation of unit equipment.
To achieve these goals, the utility model is related to numeric type two-wire system axial displacement pick-up table agent structure include
Housing, sensor input, current output terminal, original signal Buffer output interface, USB interface and circuit unit, the sensing
Device input terminal, current output terminal, original signal Buffer output interface and USB interface are installed on the exterior panel of the housing
With convenient to operate and control, circuit unit is arranged at the inside of housing, and respectively with sensor input, current output terminal, original
Signal Buffer output interface is connected with USB interface power information, wherein, circuit unit includes oscillating circuit, linearizer, low pass
Filter circuit, programmable amplifying circuit, analog/digital conversion circuit, central processing unit, D/A switch circuit, power-switching circuit,
Two-wire system V/I translation circuits, HART communication output circuit, USB communication output circuits and original signal Buffer output circuit, sensing
Device input terminal connects the input terminal of linearizer, the output terminal connection low pass filtered of linearizer with the output terminal of oscillating circuit
The input terminal of wave circuit, low-pass filter circuit output terminal connection programmable amplifying circuit input terminal, programmable amplifying circuit it is defeated
Outlet connects the input terminal of analog/digital conversion circuit, and the output terminal of analog/digital conversion circuit connects the input terminal of central processing unit,
The output terminal of central processing unit connects low-pass filter circuit, programmable amplifying circuit, D/A switch circuit, HART communication respectively
The input terminal of output circuit and USB communication output circuits, output terminal and the two-wire system V/I translation circuits of D/A switch circuit
Input terminal connects, the current output terminal connection HART communication output circuit and power-switching circuit of two-wire system V/I translation circuits,
Sensor input is connected with the signal input part power information of original signal Buffer output circuit, original signal Buffer output circuit
Output terminal and original signal Buffer output orifice.
The sensor input is suitable for access eddy current sensor；
The current output terminal exports 4~20mA；
The linearizer carries out detection, linearisation to the high frequency ac signal that sensor input inputs, and output is handed over
Flow voltage signal；
The low-pass filter circuit will carry out low-pass filtering to ac voltage signal, filter interference signal；
The programmable amplifying circuit carries out ratio enlargement to filtered signal and obtains voltage analog signal, to improve A/D
Sampling precision；
Amplified voltage analog signal is converted to digital signal by the analog/digital conversion circuit, and passes through digital interface
It is sent to central processing unit；
The digital signal received is carried out calculating conversion by the central processing unit, and passes through digital interface by Change-over knot
Fruit is sent to D/A conversion circuits；
The D/A conversion circuits are converted according to the DC voltage that the digital signal output received is specified to two-wire system V/I
Circuit；
The input voltage of the two-wire system V/I translation circuits is divided into two parts：D/A conversion circuits output voltage and sampling electricity
The feedback voltage of resistance, sampling resistor Rs are connected on the low side of circuit, and all electric currents will all flow back into power cathode by Rs, then
When circuit power consumption curent change, the voltage on Rs also changes and influences V/I translation circuits in turn as feedback voltage therewith
Control source, so as to ensure that the stabilization of total current.Citing, it is current to measure when instrument full scale is -1000~+1000um
Be worth for -500um when, then 4-20mA outputs should be 8mA, while all power consumption electric currents of instrument also be included in this 8mA, even if
Instrument power consumption electric current has fluctuation, but the total current of 8mA is constant, is solely dependent upon current measurement value.
The USB communications output circuit is directly communicated by USB interface with host computer, uploads the current state of instrument
Or carry out parameter setting；
The HART communication output circuit can be superimposed a rate digital signal in 4-20mA analog signals, so as to logical
Crossing 4-20mA signal wires can directly be communicated with host computer, uploaded the current state of instrument or carried out parameter setting.
A kind of improvement as the utility model：Power supply is equipped in housing, for powering to other circuits.
The utility model is related to the operation principle of numeric type two-wire system axial displacement pick-up table be：Eddy current sensor is passed through
Mounting bracket is fixed near rotary shaft of machine, and eddy current sensor surfaces are 0.5-1.5mm with shaft distance, is contactless peace
Dress；Eddy current sensor cable is connected with instrument connector, and oscillating circuit is equipped in instrument and provides oscillation source, high frequency to eddy current sensor
Oscillating current generates the magnetic field of alternation in the coil of probe head, when tested metallic object is close to magnetic field, is then tested metal surface
Sensing electric current is generated, is referred to as current vortex on electromagnetism, and current vortex generates new alternating magnetic field, so as to cause probe coil
Equivalent resistance correspondingly change, variation degree has reacted the distance of testee and sensor；Eddy current sensor is defeated
Go out signal for high frequency ac signal, signal frequency immobilizes, and signal amplitude and testee are directly proportional to the distance of sensor；
Two-wire system V/I converters are with general V/I translation circuits difference：Voltage signal is not to directly control output current, but
Entire circuit itself power consumption electric current is controlled, the DC voltage that D/A converter exports is converted to 4- by two-wire system V/I translation circuits
20mA is exported.
Compared with prior art, it is only necessary to connect two twisted-pair feeders, not only provide power supply for pick-up table, but also be 4-20mA signals
Output line, while still HART communication line；Belong to low-power consumption instrument, all internal elements use low-power consumption component；4-
20mA outputs represent in-site measurement value, while also contain all power supplies of instrument, ensure maximum power consumption no more than 3.75mA,
Design current backfeed loop in circuit simultaneously adjusts current output value according to instrument current power consumption；Can be on-site service personnel
More information are provided, such as：GAP voltages etc.；It has many advantages, such as to save cost, easy-to-connect, low-power consumption, while the pick-up table
Multiple sensors system can be docked, there is higher reliability, flexibility and antijamming capability, it is with good economic efficiency
With wide market value.
Description of the drawings：
Fig. 1 be the utility model is related to numeric type two-wire system axial displacement pick-up table agent structure schematic diagram.
Fig. 2 be the utility model is related to numeric type two-wire system axial displacement pick-up table electrical block diagram.
Specific embodiment：
The utility model is further described by way of example and in conjunction with the accompanying drawings.
Embodiment 1：
As depicted in figs. 1 and 2, agent structure includes shell to the numeric type two-wire system axial displacement pick-up table that the present embodiment is related to
Body 1, sensor input 2, current output terminal 3, original signal Buffer output interface 4, USB interface 5 and circuit unit 6, it is described
Sensor input 2, current output terminal 3, original signal Buffer output interface 4 and USB interface 5 are installed in the housing 1
With convenient to operate and control on exterior panel, circuit unit 6 is arranged at the inside of housing 1, and respectively with sensor input 2, electricity
Stream output terminal 3, original signal Buffer output interface 4 are connected with 5 power information of USB interface, wherein, circuit unit 6 includes vibration electricity
Road 7, linearizer 8, low-pass filter circuit 9, programmable amplifying circuit 10, analog/digital conversion circuit 11, central processing unit 12,
D/A switch circuit 13, power-switching circuit 14, two-wire system V/I translation circuits 15, HART communication output circuit 16, USB communications
Output circuit 17 and original signal Buffer output circuit 18, sensor input 2 connects linearisation with the output terminal of oscillating circuit 7
The input terminal of circuit 8, linearizer 8 output terminal connection low-pass filter circuit 9 input terminal, low-pass filter circuit 9 it is defeated
Outlet connects the input terminal of programmable amplifying circuit 10, and the output terminal of programmable amplifying circuit 10 connects the defeated of analog/digital conversion circuit 11
Enter end, the input terminal of the output terminal connection central processing unit 12 of analog/digital conversion circuit 11, the output terminal of central processing unit 12
Low-pass filter circuit 9, programmable amplifying circuit 10, D/A switch circuit 13, HART communication output circuit 16 and USB are connected respectively
The input terminal of output circuit 17 is communicated, the output terminal of D/A switch circuit 13 connects with the input terminal of two-wire system V/I translation circuits 15
Logical, the current output terminal connection HART communication output circuit 16 and power-switching circuit 14 of two-wire system V/I translation circuits 15 pass
Sensor input terminal 2 is connected with the signal input part power information of original signal Buffer output circuit 18, original signal Buffer output electricity
The output terminal on road 18 is connected with original signal Buffer output interface 4.
The sensor input 2 accesses eddy current sensor；
The current output terminal 3 exports 4~20mA；
The linearizer 8 carries out detection, linearisation, output to the high frequency ac signal that sensor input 2 inputs
Ac voltage signal；
The low-pass filter circuit 9 will carry out low-pass filtering to ac voltage signal, filter interference signal；
The programmable amplifying circuit 10 carries out ratio enlargement to filtered signal and obtains voltage analog signal, to improve A/
D sampling precisions；
Amplified voltage analog signal is converted to digital signal by the analog/digital conversion circuit 11, and is passed through number and connect
Mouth is sent to central processing unit 12；
The digital signal received is carried out calculating conversion by the central processing unit 12, and passes through digital interface by conversion
As a result D/A conversion circuits 13 are sent to；
The D/A conversion circuits 13 become according to the DC voltage that the digital signal output received is specified to two-wire system V/I
Change circuit 15；
The input voltage of the two-wire system V/I translation circuits 15 is divided into two parts：D/A conversion circuits output voltage and sampling
The feedback voltage of resistance, sampling resistor Rs are connected on the low side of circuit, and all electric currents all will flow back into power cathode by Rs,
Then when circuit power consumption curent change, the voltage on Rs also changes and influences V/I conversion electricity in turn as feedback voltage therewith
The control source on road, so as to ensure that the stabilization of total current.Citing, it is current to survey when instrument full scale is -1000~+1000um
When magnitude is -500um, then 4-20mA outputs should be 8mA, while all power consumption electric currents of instrument are also included in this 8mA, i.e.,
Instrument power consumption electric current is made to have fluctuation, but the total current of 8mA is constant, is solely dependent upon current measurement value.
The USB communications output circuit 17 is directly communicated by USB interface 5 with host computer, uploads the current of instrument
State carries out parameter setting；
The HART communication output circuit 16 can be superimposed a rate digital signal in 4-20mA analog signals, so as to
It can directly be communicated by 4-20mA signal wires with host computer, upload the current state of instrument or carry out parameter setting.
Embodiment 2：
The present embodiment and embodiment 1 difference lies in：The power supply powered to other circuits is equipped in housing 1.
Claims (1)
1. a kind of numeric type two-wire system axial displacement pick-up table, it is characterised in that：Agent structure include housing, sensor input,
Current output terminal, original signal Buffer output interface, USB interface and circuit unit, the sensor input, electric current output
End, original signal Buffer output interface and USB interface are installed on the exterior panel of the housing, and circuit unit is arranged at shell
The inside of body, and respectively with sensor input, current output terminal, original signal Buffer output interface and USB interface power information
Connection, wherein, circuit unit includes oscillating circuit, linearizer, low-pass filter circuit, programmable amplifying circuit, analog/digital conversion
Circuit, central processing unit, D/A switch circuit, power-switching circuit, two-wire system V/I translation circuits, HART communication output electricity
The output terminal connecting line of road, USB communication output circuits and original signal Buffer output circuit, sensor input and oscillating circuit
Property circuit input terminal, linearizer output terminal connection low-pass filter circuit input terminal, low-pass filter circuit it is defeated
Outlet connects the input terminal of programmable amplifying circuit, and the output terminal of programmable amplifying circuit connects the input terminal of analog/digital conversion circuit,
The input terminal of the output terminal connection central processing unit of analog/digital conversion circuit, the output terminal of central processing unit connects low respectively
Bandpass filter circuit, programmable amplifying circuit, D/A switch circuit, HART communication output circuit and USB communicate the input of output circuit
End, the output terminal of D/A switch circuit are connected with the input terminal of two-wire system V/I translation circuits, the electricity of two-wire system V/I translation circuits
Flow output terminal connection HART communication output circuit and power-switching circuit, sensor input and original signal Buffer output circuit
The connection of signal input part power information, the output terminal of original signal Buffer output circuit connects with original signal Buffer output interface
It is logical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720981750.0U CN207395763U (en) | 2017-08-07 | 2017-08-07 | A kind of numeric type two-wire system axial displacement pick-up table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720981750.0U CN207395763U (en) | 2017-08-07 | 2017-08-07 | A kind of numeric type two-wire system axial displacement pick-up table |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207395763U true CN207395763U (en) | 2018-05-22 |
Family
ID=62418026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720981750.0U Active CN207395763U (en) | 2017-08-07 | 2017-08-07 | A kind of numeric type two-wire system axial displacement pick-up table |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207395763U (en) |
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2017
- 2017-08-07 CN CN201720981750.0U patent/CN207395763U/en active Active
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