Mine vibration signal acquisition circuit and device

Abstract

The invention provides a mine vibration signal acquisition circuit and device, and relates to the technical field of mine safety monitoring. The circuit comprises an inverting amplifier unit, a current loop transmitter unit, an isolation transmitter unit and a filtering unit which are sequentially connected in series, and further comprises a first voltage stabilizer unit connected with the inverting amplifier unit in parallel and a second voltage stabilizer unit connected with the power supply end of the isolation transmitter unit. Wherein the inverting amplifier receives and amplifies a vibration signal transmitted by the vibration sensor, and transmits the vibration signal to the current loop transmitter; the unit transmits the signal to the isolation transmitter, and meanwhile the first voltage stabilizer provides reference voltage for the sensor when the external direct current is connected. The isolation transmitter unit is used for converting a current signal output by the current loop transmitter into a voltage signal, and the filtering unit is used for filtering a direct current component in the voltage signal. The circuit has excellent anti-interference capability and acquisition precision while ensuring that the structure is simple and efficient.

Description

Technical Field

[0001] The present application relates to the technical field of mine safety monitoring, and in particular to a mine vibration signal acquisition circuit and device. Background Art

[0002] In the mining process, the monitoring and collection of vibration signals is crucial to ensure mine safety and optimize mining operations. Vibration signals usually come from blasting operations, mechanical operation, etc. These vibration signals contain rich information that can be used to evaluate the stability of mine structures, predict disaster risks, and optimize mining strategies.

[0003] Mining vibration signals are diverse, including natural earthquake waves, artificial blasting waves, mechanical vibration waves, etc. They are different in frequency, amplitude, waveform and other characteristics. At the same time, mining vibration signals are often weak and easily affected by various interference factors such as environmental noise and equipment noise. These interference signals may cover up the real vibration signals, resulting in inaccurate collection results.

[0004] In response to this challenge, some mining vibration signal acquisition circuits have appeared on the market, which have met the basic acquisition needs to a certain extent. However, in practical applications, these circuits still expose some problems and shortcomings. On the one hand, some circuit designs are too complicated, aiming to fully cope with various interferences, but this may increase costs and maintenance difficulties; on the other hand, some circuits rely on highly sensitive sensors to improve acquisition accuracy, but this may also make the circuit more susceptible to noise interference. Summary of the invention

[0005] In order to solve the above problems, the present application provides a mining vibration signal acquisition circuit and device. By optimizing the circuit topology, the circuit has excellent anti-interference ability and acquisition accuracy while ensuring simple and efficient structure.

[0006] This application is implemented as follows:

[0007] In the first aspect, the present application provides a mining vibration signal acquisition circuit, which includes an inverting amplifier unit, a current loop transmitter unit, an isolation transmitter unit and a filter unit connected in series in sequence, and also includes a first voltage regulator unit connected in parallel with the inverting amplifier unit, and a second voltage regulator unit connected to the power supply end of the isolation transmitter unit. Among them, the input end of the inverting amplifier unit is used to connect to the vibration sensor, the input end of the second voltage regulator unit is used to connect to the external direct current, and the output end of the filter unit is used to connect to the data acquisition card. The inverting amplifier unit is used to receive and amplify the vibration signal transmitted by the vibration sensor, and then transmit it to the current loop transmitter unit; the current loop transmitter unit is used to receive the amplified vibration signal and transmit it to the isolation transmitter unit, and when the external direct current is connected, the first voltage regulator unit is used to provide a reference voltage for the vibration sensor; the isolation transmitter unit is used to convert the current signal output by the current loop transmitter into a voltage signal; the filter unit is used to filter out the DC component in the voltage signal output by the isolation transmitter unit.

[0008] In some implementations, the inverting amplifier unit includes an operational amplifier U1, a resistor R1, a resistor R2, a resistor R9, and a terminal block H2; wherein, the pin IN- of the operational amplifier U1 is connected to the pin OUT of the operational amplifier U1 through the resistor R2, the pin IN- of the operational amplifier U1 is also connected to the terminal 2 of the terminal block H2 through the resistor R1, the pin IN+ of the operational amplifier U1 is connected to the terminal 1 of the terminal block H2 through the resistor R9, and the terminal block H2 is used to connect to the vibration sensor.

[0009] In some implementations, the first voltage regulator unit includes a current regulator tube U3, a capacitor C3, a resistor R5, a resistor R6, a resistor R7 and a resistor R8; wherein, the terminal 3 of the current regulator tube U3 is grounded, the terminal 1 of the current regulator tube U3 is grounded through the resistor R8, the terminal 1 of the current regulator tube U3 is also connected to the terminal 2 of the current regulator tube U3 through the resistor R7, the terminal 2 of the current regulator tube U3 is connected to the terminal 2 of the terminal block H2, the terminal 2 of the current regulator tube U3 is also grounded after being connected in series with the resistor R5 and the capacitor C3, and the common end of the resistor R5 and the resistor R7 is connected to the resistor R6.

[0010] In some implementations, the current loop transmitter unit includes a circuit loop transmitter U2, a transistor Q1, a transient suppression diode D1, a diode D2, a capacitor C1, a capacitor C2, and a resistor R3; wherein the pin IIN of the circuit loop transmitter U2 is connected to the pin OUT of the operational amplifier U1 through the resistor R3, the pin VREF of the circuit loop transmitter U2 is connected to the resistor R6, the pin VREG of the circuit loop transmitter U2 is grounded through the capacitor C1, and the pin VREG of the circuit loop transmitter U2 is connected to the resistor R6. The pin V+ of the operational amplifier U1 is connected, the pin V+ of the circuit circulation transmitter U2 is connected to the cathode of the diode D2, the pin V+ of the circuit circulation transmitter U2 is connected to the pin IO of the circuit circulation transmitter U2 through the capacitor C2 and the transient suppression diode D1 connected in parallel, the pin B of the circuit circulation transmitter U2 is connected to the base of the transistor Q1, the pin V+ of the circuit circulation transmitter U2 is connected to the collector of the transistor Q1, and the pin E of the circuit circulation transmitter U2 is connected to the emitter of the transistor Q1.

[0011] In some implementations, the isolation transmitter unit includes a reference voltage chip U4, a current and voltage isolation chip U5, a transistor Q2, a capacitor C4, a resistor R10 and a resistor R11; wherein, the pin CATHODE of the reference voltage chip U4 is connected to the base of the transistor Q2, the pin ANODE of the reference voltage chip U4 is connected to the anode of the diode D2, the pin ANODE of the reference voltage chip U4 is connected to the pin REF of the reference voltage chip U4 through the resistor R11, the pin REF of the reference voltage chip U4 is connected to the emitter of the transistor Q2, the base of the transistor Q2 is connected to the collector of the transistor Q2 through the resistor R10, the collector of the transistor Q2 is connected to the pin POUT+ of the current and voltage isolation chip U5, and the pin PIN+ of the current and voltage isolation chip U5 is connected to the pin PIN- of the current and voltage isolation chip U5 through the capacitor C4.

[0012] In some implementations, the second voltage regulator unit includes a voltage regulator chip U6, a light-emitting diode LED1, a resistor R14, a capacitor C6, a capacitor C7 and a terminal block H5; wherein, pin IN of the voltage regulator chip U6 is grounded through the capacitor C7, the terminal block H5 and the capacitor C7 are connected in parallel, pin OUT of the voltage regulator chip U6 is connected to the anode of the light-emitting diode LED1 through the resistor R14, the cathode of the light-emitting diode LED1 is grounded, pin OUT of the voltage regulator chip U6 is grounded through the capacitor C6, and pin OUT of the voltage regulator chip U6 is connected to pin PIN+ of the current and voltage isolation chip U5.

[0013] In some implementations, the filtering unit includes a resistor R12, a resistor R13, a capacitor C5, and a terminal block H4; wherein the resistor R13 and the terminal block H4 are connected in parallel, the capacitor C5 and the resistor R12 are connected in series and then connected in parallel with the resistor R13, a common end of the capacitor C5 and the resistor R12 is connected to the pin SOUT+ of the current and voltage isolation chip U5, and the terminal block H4 is used to connect to a data acquisition card.

[0014] In a second aspect, the present application provides a mine vibration signal acquisition device, which includes any mine vibration signal acquisition circuit as described in the first aspect.

[0015] Compared with the prior art, the present invention has at least the following advantages or beneficial effects:

[0016] The mining vibration signal acquisition circuit realizes efficient and accurate acquisition of vibration signals through close cooperation and mutual interaction between various units. The inverting amplifier unit increases the amplitude of the signal, the current loop transmitter unit realizes stable transmission of the signal and provision of reference voltage, the isolation transmitter unit realizes electrical isolation and integrity maintenance of the signal, the filter unit filters out the DC component in the signal to improve the purity, and the voltage regulator unit provides a stable power supply voltage for the entire circuit. With the joint action of these units, this circuit has excellent anti-interference ability and acquisition accuracy while ensuring a simple and efficient structure, providing reliable technical support for vibration signal monitoring and acquisition in the mining process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of a mine vibration signal acquisition circuit of the present application;

[0019] Figure 2 This is a schematic diagram of the circuit principle of an inverting amplifier unit, a first voltage regulator unit and a current loop transmitter unit in an embodiment of a mining vibration signal acquisition circuit of the present application;

[0020] Figure 3 This is a schematic diagram of the circuit principle of an isolation transmitter unit, a second voltage regulator unit and a filter unit in one embodiment of a mine vibration signal acquisition circuit of the present application;

[0021] Icons: 1. Inverting amplifier unit; 2. Current loop transmitter unit; 3. Isolation transmitter unit; 4. Filter unit; 5. First voltage regulator unit; 6. Second voltage regulator unit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] Example:

[0025] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] The embodiment of the present application provides a mining vibration signal acquisition circuit, which can realize efficient and accurate acquisition of vibration signals while ensuring a simple and stable circuit structure, and significantly enhance the anti-interference ability of the circuit, providing more reliable technical support for vibration signal monitoring and acquisition during mining.

[0027] Please refer to Figure 1The mining vibration signal acquisition circuit includes an inverting amplifier unit 1, a current loop transmitter unit 2, an isolation transmitter unit 3 and a filter unit 4 connected in series in sequence, and also includes a first voltage regulator unit 5 connected in parallel with the inverting amplifier unit 1, and a second voltage regulator unit 6 connected to the power supply end of the isolation transmitter unit 3. Among them, the input end of the inverting amplifier unit 1 is used to connect to the vibration sensor, the input end of the second voltage regulator unit 6 is used to connect to the external direct current, and the output end of the filter unit 4 is used to connect to the data acquisition card. The inverting amplifier unit 1 is used to receive and amplify the vibration signal transmitted by the vibration sensor, and then transmit it to the current loop transmitter unit 2; the current loop transmitter unit 2 is used to receive the amplified vibration signal and transmit it to the isolation transmitter unit 3, and when the external direct current is connected, the first voltage regulator unit 5 provides a reference voltage for the vibration sensor; the isolation transmitter unit 3 is used to convert the current signal output by the current loop transmitter into a voltage signal; the filter unit 4 is used to filter out the DC component in the voltage signal output by the isolation transmitter unit 3.

[0028] It should be noted that the inverting amplifier unit 1 is responsible for receiving weak vibration signals from the vibration sensor. By amplifying these signals, the inverting amplifier unit 1 ensures that the subsequent units can receive signals of sufficient strength for processing. The output signal of the inverting amplifier unit 1 is opposite in phase to the input signal, which helps to reduce signal distortion. The current loop transmitter unit 2 receives the amplified signal from the inverting amplifier unit 1 and converts it into a current signal for transmission. This conversion helps to reduce the loss of the signal during transmission and maintain the stability of the signal. In addition, when the external DC power supply is turned on, the current loop transmitter unit 2 also provides a stable reference voltage for the vibration sensor through the first regulator unit 5, thereby ensuring the accurate measurement of the sensor. The isolation transmitter unit 3 receives the current signal from the current loop transmitter unit 2 and converts it into a voltage signal for output. The design of the isolation transmitter unit 3 realizes the electrical isolation of the signal, effectively reduces the influence of external interference on the signal, thereby improving the anti-interference ability of the signal, while maintaining the integrity of the signal, and providing a reliable signal source for subsequent processing. The filter unit 4 is responsible for receiving the voltage signal from the isolation transmitter and filtering it. The purpose of the filter unit 4 is to filter out the DC component in the signal to obtain a purer AC signal. This processing helps to reduce noise interference and improve the accuracy of the acquisition results. The mine vibration signal acquisition circuit contains two voltage regulator units. The first voltage regulator unit 5 is connected in parallel with the inverting amplifier to provide a stable power supply voltage for the inverting amplifier; the second voltage regulator unit 6 is connected to the power supply end of the isolation transmitter unit 3 to provide a stable DC power supply for the entire circuit. The use of the first voltage regulator unit 5 and the second voltage regulator unit 6 ensures that the circuit can still work normally when the power supply voltage fluctuates, thereby improving the reliability and stability of the circuit.

[0029] In summary, the above-mentioned mining vibration signal acquisition circuit realizes efficient and accurate acquisition of vibration signals through close cooperation and mutual interaction between various units. The inverting amplifier unit 1 increases the amplitude of the signal, the current loop transmitter unit 2 realizes stable transmission of the signal and provision of reference voltage, the isolation transmitter unit 3 realizes electrical isolation and integrity maintenance of the signal, the filter unit 4 filters out the DC component in the signal to improve the purity, and the first regulator unit 5 and the second regulator unit 6 provide a stable power supply voltage for the entire circuit. With the joint action of these units, the circuit has excellent anti-interference ability and acquisition accuracy while ensuring a simple and efficient structure, providing reliable technical support for vibration signal monitoring and acquisition in the mining process.

[0030] like Figure 2 As shown, in some implementations of the present application, the inverting amplifier unit 1 includes an operational amplifier U1, a resistor R1, a resistor R2, a resistor R9 and a terminal block H2; wherein, the pin IN- of the operational amplifier U1 is connected to the pin OUT of the operational amplifier U1 through the resistor R2, the pin IN- of the operational amplifier U1 is also connected to the terminal 2 of the terminal block H2 through the resistor R1, the pin IN+ of the operational amplifier U1 is connected to the terminal 1 of the terminal block H2 through the resistor R9, and the terminal block H2 is used to connect to the vibration sensor.

[0031] It should be noted that in the above implementation, the inverting amplifier unit 1 is formed by the operational amplifier U1, the resistor R1, the resistor R2 and the resistor R9, and the amplification factor is R2 / R1 times. Among them, the negative input terminal (IN-) of the operational amplifier U1 is connected to the output terminal (OUT) of the operational amplifier U1 through the resistor R2. This feedback connection enables the resistor R2 to provide negative feedback, which helps to control the gain of the operational amplifier U1 and prevent oscillation. Secondly, the negative input terminal (IN-) of the operational amplifier U1 is also connected to the terminal 2 of the terminal block H2 through the resistor R1, so that the output signal from the vibration sensor will be introduced into the negative input terminal of the operational amplifier U1 through the resistor R1, thereby inverting and amplifying the input signal.

[0032] At the same time, the positive input terminal (IN+) of the operational amplifier U1 is connected to the terminal 1 of the terminal block H2 through the resistor R9. Usually in the inverting amplifier configuration, the positive input terminal is grounded or connected to a stable reference voltage to provide a stable comparison benchmark. However, in the above implementation, it is connected to the terminal 1 of the terminal block H2 through a resistor R9, which is used to access the signal of the vibration sensor. For example, the operational amplifier U1 can adopt LT C2050 model.

[0033] like Figure 2 As shown, in some implementations of the present application, the first voltage regulator unit 5 includes a current regulator tube U3, a capacitor C3, a resistor R5, a resistor R6, a resistor R7 and a resistor R8; wherein, the terminal 3 of the current regulator tube U3 is grounded, the terminal 1 of the current regulator tube U3 is grounded through the resistor R8, the terminal 1 of the current regulator tube U3 is also connected to the terminal 2 of the current regulator tube U3 through the resistor R7, the terminal 2 of the current regulator tube U3 is connected to the terminal 2 of the terminal block H2, the terminal 2 of the current regulator tube U3 is also grounded after being connected in series with the resistor R5 and the capacitor C3, and the common end of the resistor R5 and the resistor R7 is connected to the resistor R6.

[0034] In the above implementation, the terminal 1 of the current regulator U3 is grounded through the resistor R8, so that the resistor R8 acts as a discharge resistor, which can be used to help release the charge stored in the circuit under certain circumstances (such as after power failure). The terminal 1 of the current regulator U3 is also connected to the terminal 2 of U3 through the resistor R7, and this connection can be used to provide feedback to control the output of the current regulator U3. The terminal 2 of the current regulator U3 is grounded after being connected in series with the resistor R5 and the capacitor C3. This configuration can be used for filtering to reduce noise or fluctuations in the output voltage. That is, in the above implementation, by optimizing the design of the first regulator unit 5, a high-quality reference voltage can be provided for the vibration sensor, and the performance of the circuit can be optimized by combining components such as resistors and capacitors, such as reducing noise, providing feedback control, etc. Exemplarily, the model of the current regulator U3 can be TL432.

[0035] like Figure 2As shown, in some implementations of the present application, the current loop transmitter unit 2 includes a circuit loop current transmitter U2, a transistor Q1, a transient suppression diode D1, a diode D2, a capacitor C1, a capacitor C2 and a resistor R3; wherein, the pin IIN of the circuit loop current transmitter U2 is connected to the pin OUT of the operational amplifier U1 through the resistor R3, the pin VREF of the circuit loop current transmitter U2 is connected to the resistor R6, the pin VREG of the circuit loop current transmitter U2 is grounded through the capacitor C1, and the pin VREG of the circuit loop current transmitter U2 is grounded. EG is connected to the pin V+ of the operational amplifier U1, the pin V+ of the circuit circulation transmitter U2 is connected to the cathode of the diode D2, the pin V+ of the circuit circulation transmitter U2 is connected to the pin IO of the circuit circulation transmitter U2 through the capacitor C2 and the transient suppression diode D1 connected in parallel, the pin B of the circuit circulation transmitter U2 is connected to the base of the transistor Q1, the pin V+ of the circuit circulation transmitter U2 is connected to the collector of the transistor Q1, and the pin E of the circuit circulation transmitter U2 is connected to the emitter of the transistor Q1.

[0036] It should be noted that the pin VREG of the circuit circulation transmitter U2 is grounded through the capacitor C1 and connected to the pin V+ of the operational amplifier U1. This ensures that the circuit circulation transmitter U2 has a stable power supply voltage, and this voltage is connected to the positive power supply terminal of the operational amplifier U1. The pin V+ of the circuit circulation transmitter U2 is connected to the cathode of the diode D2, and is connected to the pin IO of the circuit circulation transmitter U2 through the parallel capacitor C2 and the transient suppression diode D1. This connection method can protect the circuit from the impact of transient voltage and filter it through the capacitor C2. The pin B of the circuit circulation transmitter U2 is connected to the base of the transistor Q1, the pin V+ is connected to the collector of the transistor Q1, and the pin E is connected to the emitter of the transistor Q1. This constitutes a current source controlled by the circuit circulation transmitter U2, in which the transistor Q1 serves as the actuator of the current control.

[0037] That is, the current loop transmitter unit 2 is used to receive the output signal of the vibration sensor after being amplified by the inverting amplifier unit 1, and provide a 5V power supply and a 2.5V reference source. Among them, the pin VREF of the circuit loop current transmitter U2 provides a 2.5V reference source, the pin VREG provides a 5V power supply, and the capacitor C1 is used for filtering. The diode D2 plays a role in preventing reverse connection, and the current enters the circuit loop current transmitter U2 after passing through the transient suppression diode D1, the transistor Q1 and the capacitor C2.

[0038] For example, the circuit current transmitter U2 can be used LXR115This model of circuit current transmitter is a low-power, high-precision current output transmitter, which integrates a reference voltage source, an operational amplifier and a current driver, as well as an overcurrent protection function. The operational amplifier transmits information by controlling the current value flowing through the load, and has the advantages of strong anti-interference ability and stable long-distance transmission signals.

[0039] like Figure 3 As shown, in some implementations of the present application, the isolation transmitter unit 3 includes a reference voltage chip U4, a current and voltage isolation chip U5, a transistor Q2, a capacitor C4, a resistor R10 and a resistor R11; wherein, the pin CATHODE of the reference voltage chip U4 is connected to the base of the transistor Q2, the pin ANODE of the reference voltage chip U4 is connected to the anode of the diode D2, the pin ANODE of the reference voltage chip U4 is connected to the pin REF of the reference voltage chip U4 through the resistor R11, the pin REF of the reference voltage chip U4 is connected to the emitter of the transistor Q2, the base of the transistor Q2 is connected to the collector of the transistor Q2 through the resistor R10, the collector of the transistor Q2 is connected to the pin POUT+ of the current and voltage isolation chip U5, and the pin PIN+ of the current and voltage isolation chip U5 is connected to the pin PIN- of the current and voltage isolation chip U5 through the capacitor C4.

[0040] It should be noted that the pin ANODE of the reference voltage chip U4 is connected to the anode of the diode D2, and is connected to the pin REF of the reference voltage chip U4 through the resistor R11. This connection method can be used to adjust or stabilize the output voltage of the reference voltage chip U4. The pin REF of the reference voltage chip U4 is connected to the emitter of the transistor Q2, so as to provide a stable reference voltage point to ensure that the transistor Q2 can work normally. The pin PIN+ of the current and voltage isolation chip U5 is connected to the pin PIN- through the capacitor C4, which can reduce the noise or interference at the input end. Therefore, through the current and voltage isolation chip U5, electrical isolation between the input signal and the output signal can be achieved, and the required current or voltage signal can be transmitted at the same time. By way of example, the reference voltage chip U4 can adopt the TLV431ALPRAG model, and the current and voltage isolation chip U5 can adopt TE1533N model.

[0041] like Figure 3As shown, in some implementations of the present application, the second voltage regulator unit 6 includes a voltage regulator chip U6, a light-emitting diode LED1, a resistor R14, a capacitor C6, a capacitor C7 and a terminal block H5; wherein, pin IN of the voltage regulator chip U6 is grounded through the capacitor C7, the terminal block H5 and the capacitor C7 are connected in parallel, pin OUT of the voltage regulator chip U6 is connected to the anode of the light-emitting diode LED1 through the resistor R14, the cathode of the light-emitting diode LED1 is grounded, pin OUT of the voltage regulator chip U6 is grounded through the capacitor C6, and pin OUT of the voltage regulator chip U6 is connected to pin PIN+ of the current and voltage isolation chip U5.

[0042] It should be noted that the voltage stabilizing chip U6 is used to provide a stable output voltage, which is provided to the current and voltage isolation chip U5 as an input voltage after filtering. The light-emitting diode LED1 is used as an indication of the working state of the circuit. When the voltage stabilizing chip U6 works normally, LED1 will emit light. Resistor R14 is used to protect the light-emitting diode LED1 from being damaged due to excessive current. Capacitor C6 and capacitor C7 are used for filtering at the input and output ends respectively, reducing noise and interference, and improving the stability and reliability of the circuit. Exemplarily, the voltage stabilizing chip U6 can adopt the KA7824ETU model.

[0043] like Figure 3 As shown, in some implementations of the present application, the filtering unit 4 includes a resistor R12, a resistor R13, a capacitor C5 and a terminal block H4; wherein the resistor R13 and the terminal block H4 are connected in parallel, the capacitor C5 and the resistor R12 are connected in series and then connected in parallel with the resistor R13, a common end of the capacitor C5 and the resistor R12 is connected to the pin SOUT+ of the current and voltage isolation chip U5, and the terminal block H4 is used to connect to a data acquisition card.

[0044] In the above implementation, a RC filter circuit is formed by the combination of resistor R12, resistor R13 and capacitor C5 to smooth voltage fluctuations and reduce noise. The terminal block H4 provides a connection interface with the data acquisition card, so that the filtered signal can be easily transmitted to the data acquisition card for subsequent processing. Since the resistor R13 and the terminal block H4 are connected in parallel, the filter unit 4 can provide both the filtered signal and the original signal (if the data acquisition card requires it).

[0045] The embodiment of the present application also provides a mining vibration signal acquisition device, which is a mining vibration signal acquisition circuit as described above. It can be made into a mining vibration signal acquisition device by packaging a circuit board provided with a mining vibration signal acquisition circuit into a housing, so as to facilitate user use and be quick and convenient.

[0046] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A mine vibration signal acquisition circuit, characterized in that: It includes an inverting amplifier unit, a current loop transmitter unit, an isolation transmitter unit and a filter unit connected in series in sequence, and also includes a first voltage regulator unit connected in parallel with the inverting amplifier unit, and a second voltage regulator unit connected to the power supply end of the isolation transmitter unit; Wherein, the input end of the inverting amplifier unit is used to be connected to the vibration sensor, the input end of the second voltage regulator unit is used to be connected to the external direct current, and the output end of the filter unit is used to be connected to the data acquisition card; The inverting amplifier unit is used to receive and amplify the vibration signal from the vibration sensor, and then transmit it to the current loop transmitter unit; the current loop transmitter unit is used to receive the amplified vibration signal and transmit it to the isolation transmitter unit, and when the external DC power is connected, the first voltage regulator unit provides a reference voltage for the vibration sensor; the isolation transmitter unit is used to convert the current signal output by the current loop transmitter into a voltage signal; the filter unit is used to filter out the DC component in the voltage signal output by the isolation transmitter unit.

2. The circuit according to claim 1, characterized in that The inverting amplifier unit includes an operational amplifier U1, a resistor R1, a resistor R2, a resistor R9 and a terminal block H2; Among them, the pin IN- of the operational amplifier U1 is connected to the pin OUT of the operational amplifier U1 through the resistor R2, the pin IN- of the operational amplifier U1 is also connected to the terminal 2 of the terminal block H2 through the resistor R1, the pin IN+ of the operational amplifier U1 is connected to the terminal 1 of the terminal block H2 through the resistor R9, and the terminal block H2 is used to connect to the vibration sensor.

3. The circuit according to claim 2, characterized in that The first voltage regulator unit includes a current regulator tube U3, a capacitor C3, a resistor R5, a resistor R6, a resistor R7 and a resistor R8; Among them, terminal 3 of the current regulator tube U3 is grounded, terminal 1 of the current regulator tube U3 is grounded through the resistor R8, terminal 1 of the current regulator tube U3 is also connected to terminal 2 of the current regulator tube U3 through the resistor R7, terminal 2 of the current regulator tube U3 is connected to terminal 2 of the terminal block H2, terminal 2 of the current regulator tube U3 is also grounded after being connected in series with the resistor R5 and the capacitor C3, and the common end of the resistor R5 and the resistor R7 is connected to the resistor R6.

4. The circuit according to claim 3, characterized in that The current loop transmitter unit includes a circuit loop current transmitter U2, a transistor Q1, a transient suppression diode D1, a diode D2, a capacitor C1, a capacitor C2 and a resistor R3; Among them, the pin IIN of the circuit circulation transmitter U2 is connected to the pin OUT of the operational amplifier U1 through the resistor R3, the pin VREF of the circuit circulation transmitter U2 is connected to the resistor R6, the pin VREG of the circuit circulation transmitter U2 is grounded through the capacitor C1, the pin VREG of the circuit circulation transmitter U2 is connected to the pin V+ of the operational amplifier U1, the pin V+ of the circuit circulation transmitter U2 is connected to the cathode of the diode D2, the pin V+ of the circuit circulation transmitter U2 is connected to the pin IO of the circuit circulation transmitter U2 after passing through the capacitor C2 and the transient suppression diode D1 connected in parallel, the pin B of the circuit circulation transmitter U2 is connected to the base of the transistor Q1, the pin V+ of the circuit circulation transmitter U2 is connected to the collector of the transistor Q1, and the pin E of the circuit circulation transmitter U2 is connected to the emitter of the transistor Q1.

5. The circuit according to claim 4, characterized in that The isolation transmitter unit includes a reference voltage chip U4, a current and voltage isolation chip U5, a transistor Q2, a capacitor C4, a resistor R10 and a resistor R11; Among them, the pin CATHODE of the reference voltage chip U4 is connected to the base of the transistor Q2, the pin ANODE of the reference voltage chip U4 is connected to the anode of the diode D2, the pin ANODE of the reference voltage chip U4 is connected to the pin REF of the reference voltage chip U4 through the resistor R11, the pin REF of the reference voltage chip U4 is connected to the emitter of the transistor Q2, the base of the transistor Q2 is connected to the collector of the transistor Q2 through the resistor R10, the collector of the transistor Q2 is connected to the pin POUT+ of the current-voltage isolation chip U5, and the pin PIN+ of the current-voltage isolation chip U5 is connected to the pin PIN- of the current-voltage isolation chip U5 through the capacitor C4.

6. The circuit according to claim 5, characterized in that The second voltage stabilizer unit includes a voltage stabilizer chip U6, a light emitting diode LED1, a resistor R14, a capacitor C6, a capacitor C7 and a terminal block H5; Among them, pin IN of the voltage stabilizing chip U6 is grounded through the capacitor C7, the terminal block H5 and the capacitor C7 are connected in parallel, pin OUT of the voltage stabilizing chip U6 is connected to the anode of the light emitting diode LED1 through the resistor R14, the cathode of the light emitting diode LED1 is grounded, pin OUT of the voltage stabilizing chip U6 is grounded through the capacitor C6, and pin OUT of the voltage stabilizing chip U6 is connected to pin PIN+ of the current and voltage isolation chip U5.

7. The circuit according to claim 5, characterized in that The filtering unit includes a resistor R12, a resistor R13, a capacitor C5 and a terminal block H4; Among them, the resistor R13 is connected in parallel with the terminal block H4, the capacitor C5 is connected in series with the resistor R12 and then connected in parallel with the resistor R13, the common end of the capacitor C5 and the resistor R12 is connected to the pin SOUT+ of the current and voltage isolation chip U5, and the terminal block H4 is used to connect to the data acquisition card.

8. A mining vibration signal acquisition device, characterized in that: It comprises a mine vibration signal acquisition circuit as described in any one of claims 1-7.

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