CN217276296U - Vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment - Google Patents
Vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment Download PDFInfo
- Publication number
- CN217276296U CN217276296U CN202221017737.0U CN202221017737U CN217276296U CN 217276296 U CN217276296 U CN 217276296U CN 202221017737 U CN202221017737 U CN 202221017737U CN 217276296 U CN217276296 U CN 217276296U
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- amplifier
- capacitor
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model relates to a coal mine technical field provides a vibration characteristic data monitoring circuit for among mining ann's type fault monitoring equipment, to the input signal unit respectively through power management circuit, excessive pressure current-limiting protection circuit, signal conditioning circuit and AD converting unit provide the power, the input signal unit can be with vibration, the temperature, the rotational speed, multiple signal acquisition sensors such as technology volume (voltage, electric current) concentrate and insert in same data acquisition unit, and take care of the original signal of gathering through signal conditioning circuit, and export to in the AD converting unit, provide more detailed comprehensive fault characteristic data for the fault diagnosis monitoring.
Description
Technical Field
The utility model relates to a colliery technical field especially relates to the design of the data acquisition circuit among the mechanical failure diagnosis monitoring facilities of the large-scale rotating equipment in colliery, specifically is a vibration characteristic data monitoring circuit that is arranged in mining intrinsic safety type failure monitoring facilities.
Background
At present, China is in the rapid development period of intelligent transformation and upgrading of the manufacturing industry, along with the development and the perfection of concepts of intelligent mines and smart mines, the state monitoring technology of industrial equipment is continuously upgraded, the overall level of fault diagnosis is continuously improved, and the national industrial intelligence is continuously promoted, so that the application field of state monitoring and fault diagnosis of large-scale equipment in coal mines is very wide, and a set of monitoring equipment with high precision and good stability is more important.
The monitoring equipment for fault diagnosis of the large-scale rotating equipment in the coal mine mainly comprises a sensor and a data acquisition unit. Due to the complexity of the coal mine industrial environment, the signal acquisition in the conventional coal mine mechanical fault monitoring equipment has great restriction, and if a conventional acquisition unit cannot meet the coal safety certification requirement of the coal mine equipment; the acquired signals are single in type and cannot be analyzed in all directions and at multiple angles, the sensitivity of early weak mechanical fault monitoring is poor, the monitored signals are complex in composition, various noises are overlapped, and the like, and the instability and external interference bring certain errors to data processing and fault judgment in the later period, so that the current situation of monitored equipment cannot be timely and accurately reflected, and adverse effects are caused to coal mine enterprises.
SUMMERY OF THE UTILITY MODEL
The collection signal type that exists is single among the fault monitoring equipment to prior art, and the collection unit design can't satisfy the colliery operation requirement, and the signal sensitivity is poor, and the signal carries the noise multi-problem, the utility model provides a vibration characteristic data monitoring circuit for among the mining ann's type fault monitoring equipment, this circuit structure is simple, and convenient operation is convenient for monitor for equipment in the colliery complex environment in the pit.
The utility model discloses a realize through following technical scheme:
a vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment comprises an input voltage unit, a power supply management circuit, an input signal unit, an overvoltage current-limiting protection circuit, a signal conditioning circuit and an AD (analog-to-digital) conversion unit; the output end of the input voltage unit is connected with the input end of the power management circuit; the output end of the power management circuit is respectively connected with the input signal unit, the overvoltage current-limiting protection circuit, the signal conditioning circuit and the power input end of the AD conversion unit; the output end of the input signal unit is connected with the input end of the overvoltage current-limiting protection circuit, and the output end of the overvoltage current-limiting protection circuit is connected with the signal input end of the signal conditioning circuit; and the signal output end of the signal conditioning circuit is connected with the signal receiving end of the AD conversion unit.
Preferably, the input signal unit includes a temperature signal unit, a vibration signal unit, a process quantity signal unit, and a rotation speed signal unit.
Preferably, the signal conditioning circuit adopts a single-ended signal conditioning circuit; the single-ended signal conditioning circuit comprises a single-ended signal input terminal Vin, a capacitor C3, a resistor R1, a resistor R2, a resistor R4, a resistor R3, a resistor R6, an amplifier U2, an amplifier U1, a bias voltage Vref and a V _ P output terminal;
one end of the single-ended signal input end Vin is connected with the output end of the overvoltage current-limiting protection circuit, the other end of the single-ended signal input end Vin is arranged in a branch circuit, one branch circuit is connected with an output ground GND through a capacitor C3, and the other branch circuit is connected with the reverse end of an amplifier U2 through a resistor R4; the forward end of the amplifier U2 is connected with a bias voltage Vref through a resistor R1; the output end of the amplifier U2 is connected to the positive end of the amplifier U1 through a resistor R3; the reverse end of the amplifier U1 is connected with a bias voltage Vref through a resistor R1; the output end of the amplifier U1 is connected to the V _ P output end through a resistor R2; one end of the resistor R6 is connected to the positive end of the amplifier U1, and the other end is connected to the output end of the amplifier U1.
Furthermore, the single-ended signal conditioning circuit further comprises a resistor R5, a resistor R7, a capacitor C4, a capacitor C2 and a V _ N output end; one end of the resistor R5 is connected to the reverse end of the amplifier U1, and the other end of the resistor R5 is connected to the output end of the amplifier U1; the capacitor C4 is connected in parallel with the resistor R5, and one end of the capacitor C4 is connected to the V _ N output end through the resistor R7; one end of the capacitor C2 is connected to the output end of the resistor R2, and the other end is connected to the output end of the R7.
Preferably, the signal conditioning circuit adopts a differential signal conditioning circuit; the differential signal conditioning circuit comprises an O _ P input end, an O _ N input end, a resistor R9, a resistor R10, an amplifier U3, a resistor R11, a capacitor C7, an O1_ P output end, a resistor R14, a resistor R15, a capacitor C10, an amplifier U4, a resistor R13 and an O1_ N output end;
one end of the O _ P input end and one end of the O _ N input end are both connected with the output end of the overvoltage current-limiting protection circuit 6; the other end of the input end of the O _ P is arranged in a rear branch circuit through a resistor R9, wherein one branch circuit is connected with an output ground GDN through a capacitor C7, the other branch circuit is connected to the reverse end of an amplifier U3 through a resistor R10, the forward end of the amplifier U3 is connected with the forward end of an amplifier U4, and the output end of an amplifier U3 is connected with the output end of the amplifier U3526; is connected with the output end of the O1_ P through a resistor R11; the other end of the O _ N input end is arranged in a branch circuit behind a resistor R14, wherein one branch circuit is connected with an output ground GND through a capacitor C10, and the other branch circuit is connected to the reverse end of an amplifier U4 through a resistor R15; the output terminal of the amplifier U4 is connected to the O1_ N output terminal through a resistor R13.
Further, the differential signal conditioning circuit further comprises a resistor R8, a capacitor C5, a resistor R12, a bias voltage Vref, a capacitor C6 and a capacitor C8;
one end of the resistor R8 is connected to the reverse end of the amplifier U3, the other end of the resistor R8 is connected to the output end of the amplifier U3, the capacitor C5 is connected with the resistor R8 in parallel, and the resistor R11 and the output end of the O1_ P are connected to the output ground GDN through the capacitor C6; the positive terminal of the amplifier U3 and the positive terminal of the amplifier U4 are connected with a bias voltage Vref through a resistor R12; and a capacitor C8 is arranged between the O1_ P output end and the O1_ N output end.
Further, the differential signal conditioning circuit further comprises a resistor R16, a capacitor C11 and a capacitor C9;
one end of the capacitor C11 is connected to the reverse end of the amplifier U4, and the other end of the capacitor C11 is connected to the output end of the amplifier U4; the resistor R16 is connected in parallel with the capacitor C11, and the resistor R13 and the output end O1_ N are connected to the output ground GDN through the capacitor C9.
Preferably, an anti-reverse connection protection circuit is arranged between the input end of the power management circuit and the output end of the input voltage unit; the output end of the power management circuit is respectively connected with the input signal unit, the overvoltage current-limiting protection circuit, the signal conditioning circuit and the power input end of the AD conversion unit after passing through the current-limiting voltage-limiting unit.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a vibration characteristic data monitoring circuit for among mining ann's type fault monitoring equipment, to the input signal unit respectively through power management circuit, excessive pressure current-limiting protection circuit, signal conditioning circuit and AD converting unit provide the power, the input signal unit can be with the vibration, the temperature, the rotational speed, multiple signal acquisition sensors such as technology volume (voltage, electric current) concentrate and insert same data acquisition unit, and take care of the original signal of gathering through signal conditioning circuit, and export to the AD converting unit in, provide more detailed comprehensive fault characteristic data for the fault diagnosis monitoring.
Furthermore, the input signal unit comprises a temperature signal unit, a vibration signal unit, a process quantity signal unit and a rotating speed signal unit, the types of the collected signals are increased by signal input collection of all the units, and the collected signals can meet the use requirements of the coal mine.
Furthermore, the signal conditioning circuit adopts a single-ended signal conditioning circuit or a differential signal conditioning circuit to convert the vibration single-ended input signal acquired by the vibration sensor into a differential input signal, and the design has the advantages of strong anti-interference capability, low generated EMI (electro-magnetic interference), capability of inhibiting even-order harmonic waves, high signal strength and the like, is suitable for complex environments with humidity and high interference in a coal mine, and can stably acquire the vibration signal for a long time.
Furthermore, the single-ended signal conditioning circuit or the differential signal conditioning circuit adopts bias voltage to adjust the acquired vibration signal to the reference voltage fluctuation range of the AD, and the reference voltage source provides the voltage signal to the AD and the operational amplifier input end, so that the method has the advantages of improving the output precision, increasing the stability, inhibiting the temperature drift characteristic, and having wide output dynamic response range and the like.
Furthermore, an anti-reverse connection protection circuit is arranged between the input end of the power management circuit and the output end of the input voltage unit, so that the power management circuit is protected.
Drawings
Fig. 1 is a schematic structural diagram of a vibration characteristic data monitoring circuit used in an intrinsically safe fault monitoring device for mining according to the present invention;
fig. 2 is a schematic diagram of the structure of the single-ended signal conditioning circuit of the present invention;
fig. 3 is a schematic diagram of the structure of the differential signal conditioning circuit of the present invention;
fig. 4 is a schematic diagram of a circuit structure of a power management module of the present invention;
FIG. 5 is a schematic diagram of a circuit for conditioning a vibration signal in this embodiment;
FIG. 6 is a schematic diagram of a temperature signal conditioning circuit according to the present embodiment;
FIG. 7 is a schematic diagram of a signal conditioning circuit of the tachometer sensor of the present embodiment;
fig. 8 is a schematic diagram of a signal acquisition circuit of the process quantity sensor in the present embodiment.
In the figure: 1-an input voltage unit; 2-reverse connection prevention protection circuit; 3-a power management circuit; 4-current and voltage limiting unit; 5-an input signal unit; 6-overvoltage current-limiting protection circuit; 7-a signal conditioning circuit; 8-A/D conversion unit.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model provides a vibration characteristic data monitoring circuit for among mining ann's type fault monitoring equipment, this circuit structure is simple, and convenient operation is convenient for monitor for equipment in colliery complicated environment in the pit.
Specifically, the monitoring circuit comprises an input voltage unit 1, a power management circuit 3, an input signal unit 5, an overvoltage current-limiting protection circuit 6, a signal conditioning circuit 7 and an AD conversion unit 8; the output end of the input voltage unit 1 is connected with the input end of the power management circuit 3; the output end of the power management circuit 3 is respectively connected with the input signal unit 5, the overvoltage current-limiting protection circuit 6, the signal conditioning circuit 7 and the power input end of the AD conversion unit 8; the output end of the input signal unit 5 is connected with the input end of the overvoltage current-limiting protection circuit 6, and the output end of the overvoltage current-limiting protection circuit 6 is connected with the signal input end of the signal conditioning circuit 7; the signal output end of the signal conditioning circuit 7 is connected with the signal receiving end of the AD conversion unit 8.
Specifically, the input signal unit comprises a temperature signal unit, a vibration signal unit, a process quantity signal unit and a rotating speed signal unit.
Specifically, the signal conditioning circuit 7 is a single-ended signal conditioning circuit, as shown in fig. 2; the single-ended signal conditioning circuit comprises a single-ended signal input terminal Vin, a capacitor C3, a resistor R1, a resistor R2, a resistor R4, a resistor R3, a resistor R6, an amplifier U2, an amplifier U1, a bias voltage Vref and a V _ P output terminal;
one end of the single-ended signal input end Vin is connected with the output end of the overvoltage current-limiting protection circuit 6, the other end of the single-ended signal input end Vin is arranged in a branch circuit, one branch circuit is connected with an output ground GND through a capacitor C3, and the other branch circuit is connected with the reverse end of an amplifier U2 through a resistor R4; the forward end of the amplifier U2 is connected with a bias voltage Vref through a resistor R1; the output end of the amplifier U2 is connected to the positive end of the amplifier U1 through a resistor R3; the reverse end of the amplifier U1 is connected with a bias voltage Vref through a resistor R1; the output end of the amplifier U1 is connected to the V _ P output end through a resistor R2; one end of the resistor R6 is connected to the positive end of the amplifier U1, and the other end is connected to the output end of the amplifier U1.
The single-ended signal conditioning circuit further comprises a resistor R5, a resistor R7, a capacitor C4, a capacitor C2 and a V _ N output end; one end of the resistor R5 is connected to the reverse end of the amplifier U1, and the other end of the resistor R5 is connected to the output end of the amplifier U1; the capacitor C4 is connected in parallel with the resistor R5, and one end of the capacitor C4 is connected to the V _ N output end through the resistor R7; one end of the capacitor C2 is connected to the output end of the resistor R2, and the other end is connected to the output end of the R7.
Vin is an overvoltage protection circuit with a single-ended signal input connected with the front end. The single-ended signal input after overvoltage protection is filtered through R4 and C3, amplified through two stages of U1 and U2, converted into differential signals, and amplified into signals V _ P and V _ N.
Specifically, the signal conditioning circuit 7 adopts a differential signal conditioning circuit, as shown in fig. 3; the differential signal conditioning circuit comprises an O _ P input end, an O _ N input end, a resistor R9, a resistor R10, an amplifier U3, a resistor R11, a capacitor C7, an O1_ P output end, a resistor R14, a resistor R15, a capacitor C10, an amplifier U4, a resistor R13 and an O1_ N output end;
one end of the O _ P input end and one end of the O _ N input end are both connected with the output end of the overvoltage current-limiting protection circuit 6; the other end of the input end of the O _ P is arranged in a post-branch circuit through a resistor R9, wherein one branch circuit is connected with an output ground GDN through a capacitor C7, the other branch circuit is connected to the reverse end of an amplifier U3 through a resistor R10, the forward end of the amplifier U3 is connected with the forward end of an amplifier U4, and the output end of an amplifier U3. Is connected with the output end of the O1_ P through a resistor R11; the other end of the O _ N input end is arranged in a branch circuit behind a resistor R14, wherein one branch circuit is connected with an output ground GND through a capacitor C10, and the other branch circuit is connected to the reverse end of an amplifier U4 through a resistor R15; the output terminal of the amplifier U4 is connected to the O1_ N output terminal through a resistor R13.
The differential signal conditioning circuit further comprises a resistor R8, a capacitor C5, a resistor R12, a bias voltage Vref, a capacitor C6 and a capacitor C8;
signals output by the front end are differential signals O _ P and O _ N, amplification and filtering of the signals are achieved through two operational amplifiers U3 and U4, and the signals are conditioned to be within an acceptable voltage range of AD and output. Vref is a bias voltage to provide a reference voltage for the op-amp.
One end of the resistor R8 is connected to the reverse end of the amplifier U3, the other end of the resistor R8 is connected to the output end of the amplifier U3, the capacitor C5 and the resistor R8 are arranged in parallel, and the resistor R11 and the O1_ P output end are connected to the output ground GDN through the capacitor C6; the positive terminal of the amplifier U3 and the positive terminal of the amplifier U4 are connected with a bias voltage Vref through a resistor R12; and a capacitor C8 is arranged between the O1_ P output end and the O1_ N output end.
The differential signal conditioning circuit further comprises a resistor R16, a capacitor C11 and a capacitor C9;
one end of the capacitor C11 is connected to the reverse end of the amplifier U4, and the other end of the capacitor C11 is connected to the output end of the amplifier U4; the resistor R16 is connected in parallel with the capacitor C11, and the resistor R13 and the output end of the O1_ N are connected to the output ground GDN through the capacitor C9.
In the utility model, an anti-reverse connection protection circuit 2 is arranged between the input end of the power management circuit 3 and the output end of the input voltage unit 1; the output end of the power management circuit 3 is connected with the input signal unit 5, the overvoltage current-limiting protection circuit 6, the signal conditioning circuit 7 and the power input end of the AD conversion unit 8 respectively after passing through the current-limiting voltage-limiting unit 4.
The utility model provides a vibration characteristic data monitoring circuit for among mining ann's type fault monitoring equipment, satisfy the relevant requirement of ann in the coal ann authentication, the power supply part adopts current-limiting voltage-limiting and second grade protection strategy, can need not increase extra explosion-proof strategy when the colliery is used, have when installing in the pit simultaneously and dispose convenient, safe, reliable etc. characteristics, in use, power management circuit mainly includes the supply circuit of each sensor, the power supply unit of bias voltage in the signal conditioning circuit, the two-stage power protection circuit of power supply input interface etc. under the prerequisite that satisfies the coal ann authentication requirement, realize the output of the standard voltage that matches with the sensor and the access of outside ann power and the relevant power supply in the signal conditioning circuit, wherein, rotational speed sensor and technological quantity sensor power supply are the voltage source, the power supply of the temperature and vibration sensor is a constant current source.
The signal conditioning circuit comprises a low-pass filter circuit, an input signal current-limiting overvoltage protection circuit, a signal amplification circuit, a differential conversion circuit, an impedance matching circuit and the like, so that signal noise caused in the transmission and field test processes is reduced to the greatest extent, and accurate and effective transmission of signals acquired by the sensor is guaranteed.
The utility model discloses when carrying out failure diagnosis, install relevant diagnosis sensor at corresponding measurement station, behind the relevant sensor signal of failure diagnosis vibration characteristic data acquisition circuit collection, through filtering and signal conversion back, convert AD with signal input.
The utility model discloses well circuit's signal processing process as follows:
the power management circuit 3 provides different power supply sources for supplying power to an external sensor according to different types of sensors, the sensors acquire related signals and then enter a data acquisition circuit, the related signals are subjected to current-limiting overvoltage protection and filtering processing, vibration acceleration signals, temperature signals, rotating speed signals and process quantity signals are respectively output and enter a signal conditioning circuit 7, and the signal conditioning circuit 7 is different in application conditioning unit according to different acquired signals. The acceleration signal needs to pass through a direct-current bias voltage removing and amplifying circuit, a single-end to differential circuit, a voltage bias circuit and an impedance matching circuit and then is directly output to the AD conversion unit 8, the temperature signal passes through the impedance matching circuit and then is directly output to the AD conversion unit 8, and the process quantity signal passes through the amplifying circuit, the voltage bias circuit and the impedance matching circuit and then is directly output to the AD conversion unit 8.
According to the schematic diagram of the power management circuit shown in fig. 4, an external intrinsic safety power supply provides power supply input voltage of the whole circuit, and after voltage conversion, power supply voltage of each sensor and power supply voltage of the conditioning circuit are obtained. The module mainly comprises a power input end reverse connection prevention protection circuit, a voltage conversion circuit, a current and voltage limiting circuit and the like. After an external power supply is input, the input power enters a power management chip U1 after reverse connection prevention of two-stage diodes D1 and D2, power supply voltage required by a conditioning circuit and each signal input unit is output, and because the maximum power supply current of the external power supply is 1A, when the types of the D1 and the D2 are selected, the power of the device is ensured to be larger than the maximum power of the input circuit, and the capacitance and inductance values of all branches under the whole voltage input need to meet the related requirements of coal safety when the types are selected. According to the voltage required by the later stage, the output voltage converted by the corresponding power supply chip needs to be subjected to voltage limiting and current limiting protection by two stages of thyristors, triodes and MOS tubes, the voltage limiting value is determined by voltage stabilizing tubes D3 and D4, and the current limiting value is determined by resistors R6 and R7, PNP tubes Q5 and Q6.
The vibration sensor in the circuit needs to provide a constant current source for power supply, the voltage subjected to current limiting and voltage limiting protection is converted into a current source for output after passing through U1, and the current output by the specific constant current source is determined by R16.
As shown in fig. 5 and 6, the vibration and temperature signal acquisition circuit includes an overcurrent and overvoltage protection and filter circuit for vibration and temperature signals, a signal amplification circuit, a single-end-to-differential and bias voltage circuit, an impedance matching circuit for temperature signals, and a disconnection monitoring circuit.
The specific working process of the circuit is as follows: after the constant current source provides excitation for the sensor, the sensor outputs a vibration signal Vin, because the vibration sensor outputs 12.5V direct current bias voltage, the direct current bias voltage is filtered by C2, after overvoltage protection and reverse connection protection of D3, D4 and D5, the vibration signal enters operational amplifiers U2 and U3 to be subjected to signal gain adjustment and single-end-to-differential signal conversion, wherein the magnitude of the signal is determined by resistors R9 and R10, meanwhile, the positive ends of U2 and U3 are connected to bias voltage Vref converted by a bias circuit, the magnitude of the bias voltage Vref can be determined by the reference voltage of AD, one path of the signal output by U2 enters U3 to be subjected to impedance matching and is output as a differential signal, the other path of the signal is directly output as the positive end of the differential signal, Vp of the output differential signal is calculated as Vp + R10/R9 Vin (Vref-Vref), Vn is calculated as Vref-R10/R9 (Vi-Vref), the C4 and the R9 form a low-pass filter, the cut-off frequency F of the filter is 1/(2 × pi × R2 × C2), and the positive and negative terminals of the differential signal are directly connected to a capacitor C5 to remove the common-mode interference between the signals.
Because the vibration signal output by the sensor is an alternating current signal superposed on a direct current bias, if the sensor has no signal feedback, no alternating current signal exists, the disconnection monitoring of the sensor can be carried out through the bias voltage output by the vibration sensor, the voltage stabilizing values of D1 and D2 are selected to be smaller than the bias voltage of the sensor, and when the sensor is disconnected, the monitored output signal Vout is about 12.5V continuously.
The specific working process of the temperature signal conditioning circuit is as follows: the constant current source which is the same as the vibration signal is adopted to output a temperature signal of 0-2.5V, and the temperature signal enters the U4 to realize impedance matching after passing through the transient suppression diode, the overvoltage protection diode and other protection circuits and can be directly output.
As shown in fig. 7, the speed signal conditioning circuit includes a power supply circuit for the sensor, an overcurrent and overvoltage protection circuit for the speed pulse, and an optical coupling isolation circuit.
The specific working process of the circuit is as follows: the method comprises the steps that firstly, an external power supply generates 12V power supply voltage, after reverse voltage withstanding protection is carried out through a Schottky diode, the maximum short-circuit current of the power supply is controlled through NPN tubes Q1 and R1, the effect of current limiting and voltage withstanding is achieved, the current limiting and voltage withstanding circuit needs two stages in total to meet the requirement of intrinsic safety design, after the sensor is powered, rotating speed signals RMP _ P and RMP _ N are output, after passing through over-current and over-voltage pulse protection circuits such as a transient suppression diode, an over-current diode and a switch diode, the signals are electrically isolated through an optical coupler, and finally, an output signal RMP can directly enter a rear stage for calculation.
As shown in fig. 8, the process variable signal acquisition circuit includes a power supply circuit for the sensor, an overcurrent and overvoltage protection circuit for input signals, a filter circuit, a signal amplification circuit, and a bias voltage circuit.
The specific working process of the circuit is as follows: firstly, an external power supply generates 12V power supply voltage, after reverse voltage withstanding protection is carried out through a Schottky diode, the maximum short-circuit current of the power supply is controlled through NPN tubes Q1 and R1, the effect of current limiting and voltage withstanding is achieved, the current limiting and voltage withstanding circuit needs two stages in all to meet the design requirement of the intrinsic safety, after power supply is carried out on a rotating speed sensor, a differential process quantity signal output is respectively subjected to current passing and overvoltage pulse protection circuits such as a transient suppression diode, an overcurrent diode and a switching diode to form Vi, the Vi is input into a negative end of an operational amplifier U1 to carry out signal gain adjustment, the size of the signal is determined by resistors R1 and R2, meanwhile, a bias voltage Vref converted by a bias circuit is input into a positive end of the operational amplifier, an output signal Vo is calculated to be Vo-Vref-R2/R1 (Vi-Vref), and the range of the process quantity signal output after conversion is: Vref-R2/R1 (Vi-Vref) -Vref + R2/R1 (Vi + Vref), wherein C1 and R2 form a low-pass filter, the cut-off frequency F of the filter is 1/(2 pi R2) C2), the positive end and the negative end of the differential signal are directly connected with a capacitor C2, and common mode interference between the signals is removed.
To sum up, the utility model provides a vibration characteristic data monitoring circuit for among mining ann's type fault monitoring equipment, to input signal unit, excessive pressure current-limiting protection circuit, signal conditioning circuit and AD converting unit respectively through power management circuit provide the power, input signal unit can be with vibration, the temperature, the rotational speed, multiple signal acquisition sensors such as technology volume (voltage, electric current) concentrate and insert in same data acquisition unit, and take care of the original signal of gathering through signal conditioning circuit, and export to the AD converting unit in, provide more detailed comprehensive fault characteristic data for the fault diagnosis monitoring.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (8)
1. A vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment is characterized by comprising an input voltage unit (1), a power management circuit (3), an input signal unit (5), an overvoltage current-limiting protection circuit (6), a signal conditioning circuit (7) and an AD (analog-to-digital) conversion unit (8); the output end of the input voltage unit (1) is connected with the input end of the power management circuit (3); the output end of the power supply management circuit (3) is respectively connected with the input signal unit (5), the overvoltage current-limiting protection circuit (6), the signal conditioning circuit (7) and the power supply input end of the AD conversion unit (8); the output end of the input signal unit (5) is connected with the input end of the overvoltage current-limiting protection circuit (6), and the output end of the overvoltage current-limiting protection circuit (6) is connected with the signal input end of the signal conditioning circuit (7); the signal output end of the signal conditioning circuit (7) is connected with the signal receiving end of the AD conversion unit (8).
2. The vibration characteristic data monitoring circuit for the mining intrinsic safety type fault monitoring equipment according to claim 1, wherein the input signal unit comprises a temperature signal unit, a vibration signal unit, a process quantity signal unit and a rotating speed signal unit.
3. The vibration characteristic data monitoring circuit for the mining intrinsic safety type fault monitoring equipment according to claim 1, characterized in that the signal conditioning circuit (7) adopts a single-ended signal conditioning circuit; the single-ended signal conditioning circuit comprises a single-ended signal input terminal Vin, a capacitor C3, a resistor R1, a resistor R2, a resistor R4, a resistor R3, a resistor R6, an amplifier U2, an amplifier U1, a bias voltage Vref and a V _ P output terminal;
one end of the single-ended signal input end Vin is connected with the output end of the overvoltage current-limiting protection circuit (6), the other end of the single-ended signal input end Vin is provided with a branch circuit, one branch circuit is connected with an output ground GND through a capacitor C3, and the other branch circuit is connected with the reverse end of an amplifier U2 through a resistor R4; the forward end of the amplifier U2 is connected with a bias voltage Vref through a resistor R1; the output end of the amplifier U2 is connected to the positive end of the amplifier U1 through a resistor R3; the reverse end of the amplifier U1 is connected with a bias voltage Vref through a resistor R1; the output end of the amplifier U1 is connected to the V _ P output end through a resistor R2; one end of the resistor R6 is connected to the positive end of the amplifier U1, and the other end is connected to the output end of the amplifier U1.
4. The vibration signature data monitoring circuit for use in a mining intrinsically safe fault monitoring device of claim 3, wherein the single-ended signal conditioning circuit further comprises a resistor R5, a resistor R7, a capacitor C4, a capacitor C2 and a V _ N output; one end of the resistor R5 is connected to the reverse end of the amplifier U1, and the other end of the resistor R5 is connected to the output end of the amplifier U1; the capacitor C4 is connected in parallel with the resistor R5, and one end of the capacitor C4 is connected to the V _ N output end through the resistor R7; one end of the capacitor C2 is connected to the output end of the resistor R2, and the other end is connected to the output end of the R7.
5. The vibration characteristic data monitoring circuit for the mining intrinsic safety type fault monitoring equipment according to claim 1, characterized in that the signal conditioning circuit (7) adopts a differential signal conditioning circuit; the differential signal conditioning circuit comprises an O _ P input end, an O _ N input end, a resistor R9, a resistor R10, an amplifier U3, a resistor R11, a capacitor C7, an O1_ P output end, a resistor R14, a resistor R15, a capacitor C10, an amplifier U4, a resistor R13 and an O1_ N output end;
one end of the O _ P input end and one end of the O _ N input end are both connected with the output end of the overvoltage current-limiting protection circuit (6); the other end of the input end of the O _ P is arranged in a rear branch circuit through a resistor R9, wherein one branch circuit is connected with an output ground GDN through a capacitor C7, the other branch circuit is connected to the reverse end of an amplifier U3 through a resistor R10, the forward end of the amplifier U3 is connected with the forward end of an amplifier U4, and the output end of an amplifier U3 is connected with the output end of the amplifier U3526; is connected with the output end of the O1_ P through a resistor R11; the other end of the O _ N input end is arranged in a branch circuit behind a resistor R14, wherein one branch circuit is connected with an output ground GND through a capacitor C10, and the other branch circuit is connected to the reverse end of an amplifier U4 through a resistor R15; the output terminal of the amplifier U4 is connected to the O1_ N output terminal through a resistor R13.
6. The vibration signature data monitoring circuit for use in a mining intrinsically safe fault monitoring device of claim 5, wherein the differential signal conditioning circuit further comprises a resistor R8, a capacitor C5, a resistor R12, a bias voltage Vref, a capacitor C6 and a capacitor C8;
one end of the resistor R8 is connected to the reverse end of the amplifier U3, the other end of the resistor R8 is connected to the output end of the amplifier U3, the capacitor C5 is connected with the resistor R8 in parallel, and the resistor R11 and the output end of the O1_ P are connected to the output ground GDN through the capacitor C6; the positive end of the amplifier U3 and the positive terminal of the amplifier U4 are connected with a bias voltage Vref through a resistor R12; and a capacitor C8 is arranged between the O1_ P output end and the O1_ N output end.
7. The vibration signature data monitoring circuit for use in a mining intrinsically safe fault monitoring device of claim 5, wherein the differential signal conditioning circuit further comprises a resistor R16, a capacitor C11 and a capacitor C9;
one end of the capacitor C11 is connected to the reverse end of the amplifier U4, and the other end of the capacitor C11 is connected to the output end of the amplifier U4; the resistor R16 is connected in parallel with the capacitor C11, and the resistor R13 and the output end of the O1_ N are connected to the output ground GDN through the capacitor C9.
8. The vibration characteristic data monitoring circuit for the mining intrinsic safety type fault monitoring equipment is characterized in that an anti-reverse connection protection circuit (2) is arranged between the input end of the power management circuit (3) and the output end of the input voltage unit (1); the output end of the power management circuit (3) is respectively connected with the input signal unit (5), the overvoltage current-limiting protection circuit (6), the signal conditioning circuit (7) and the power input end of the AD conversion unit (8) after passing through the current-limiting voltage-limiting unit (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221017737.0U CN217276296U (en) | 2022-04-28 | 2022-04-28 | Vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221017737.0U CN217276296U (en) | 2022-04-28 | 2022-04-28 | Vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217276296U true CN217276296U (en) | 2022-08-23 |
Family
ID=82880725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221017737.0U Active CN217276296U (en) | 2022-04-28 | 2022-04-28 | Vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217276296U (en) |
-
2022
- 2022-04-28 CN CN202221017737.0U patent/CN217276296U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106646248A (en) | BMS current detection and overcurrent protection circuit | |
| CN108664439B (en) | Analog quantity output circuit device with digital isolation | |
| CN111721995A (en) | Isolation sampling circuit of direct current voltage signal | |
| CN106768460A (en) | A kind of charging pile pipette tips temperature collection circuit and method | |
| CN207114731U (en) | A kind of BMS current detectings and current foldback circuit | |
| CN217276296U (en) | Vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment | |
| CN209894959U (en) | High-common-mode-interference-resistance small-signal isolation sampling conditioning circuit of electronic transformer | |
| CN106546806A (en) | Current sensing means with Gain Automatic regulation and telecommunications functions | |
| CN202197244U (en) | Motor position detection circuit adopting isolation type rotary transformer | |
| CN209070002U (en) | A kind of high-precision bidirectional DC voltage isolation Acquisition Circuit | |
| CN210221512U (en) | Bogie unstability monitored control system | |
| CN106443137A (en) | Electric current collector of two-wire system sensor | |
| CN215954178U (en) | Current equalizing circuit of parallel power supply | |
| CN206411182U (en) | A kind of charging pile current divider current collection circuit | |
| CN111122960A (en) | Circuit and method for multi-channel detection of branch current of LED driving circuit | |
| CN114441846A (en) | High-precision voltage detection control circuit | |
| CN210294383U (en) | High-precision direct-current metering signal sampling circuit | |
| CN112630524A (en) | Low-current signal acquisition processing circuit and acquisition processing method | |
| CN210037958U (en) | Voltage isolation sampling circuit | |
| CN216717398U (en) | Vibration wire signal conditioning device | |
| CN220064222U (en) | Residual current collection circuit | |
| CN211955645U (en) | Multichannel circuit for detecting branch current of LED drive circuit | |
| CN205982398U (en) | Converter is direct current voltage detection circuit for module | |
| CN205647489U (en) | AI device and galvanic isolation circuit with galvanic isolation circuit | |
| CN117081514B (en) | Power supply system of digital audio power amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |