Multi-type sensor vibration acquisition device

Abstract

The invention, which belongs to the technical field of vibration signal acquisition, provides a multi-type sensor vibration acquisition device comprising a signal processing module, an A / D conversion module and a main control chip. The signal processing module comprises a plurality of signal acquisition ends and a plurality of signal output ends, and the plurality of signal acquisition ends are electrically connected with a plurality of external signal sensors respectively; the A / D conversion module comprises a plurality of signal input ends, the plurality of signal input ends are electrically connected with the plurality of signal output ends of the signal processing module respectively, and the output end of the A / D conversion module is electrically connected with the main control chip; and the main control chip is in communication connection with a far-end user side. The technical problem that the evaluation accuracy is wrong when multiple types of sensor signals are collected at the same time in the prior art is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of vibration signal acquisition technology, and more specifically to a vibration acquisition device with multiple types of sensors. Background Technology

[0002] Vibration signal acquisition is crucial in industrial equipment operation and maintenance and large structure monitoring. Traditional acquisition devices are bulky due to the need to accommodate multiple complex sensors and supporting modules. In the monitoring of large rotating equipment, the large size of the acquisition device leads to complex wiring, long signal transmission distances, and susceptibility to interference.

[0003] In recent years, while miniaturized data acquisition devices have alleviated space constraints, most only support a single type of sensor. Facing the need for multiple sensor types in signal analysis, users must equip themselves with multiple devices, increasing costs and complicating management. Clock asynchrony and sampling frequency differences between different devices make data fusion difficult.

[0004] In actual monitoring, bridge sensors and single-ended signal sensors are widely used, and an ideal acquisition system requires simultaneous access. Under current technology, it is difficult to achieve true synchronization when multiple devices acquire data. Independent clocks and inconsistent sampling times make it difficult to correspond to the vibration state at the same moment during data fusion, affecting the accuracy of the assessment. Summary of the Invention

[0005] In view of this, it is necessary to provide a vibration acquisition device for multiple types of sensors to solve the technical problem of erroneous evaluation when the existing technology acquires signals from multiple types of sensors at the same time.

[0006] To achieve the above-mentioned technical effects, in a first aspect, the present invention provides a multi-type sensor vibration acquisition device, comprising: Signal processing module, A / D conversion module, and main control chip; The signal processing module includes several signal acquisition terminals and several signal output terminals, and the several signal acquisition terminals are electrically connected to several external signal sensors respectively. The A / D conversion module includes several signal input terminals, which are electrically connected to several signal output terminals of the signal processing module, and the output terminal of the A / D conversion module is electrically connected to the main control chip. The main control chip is connected to the remote user terminal for communication. The signal processing module is used to respond to user operations and simultaneously activate several corresponding signal acquisition terminals to receive signals sent by signal sensors, perform DC blocking, filtering, and operational amplification, and then transmit the signals to the A / D conversion module. The A / D conversion module converts the DC-blocked, filtered, and operational amplified signals into digital signals and transmits them to the main control chip. The main control chip then transmits the digital signals to the remote user terminal.

[0007] In some embodiments of the present invention, the signal processing module includes at least: ICP signal input circuit, voltage signal input circuit, bridge voltage signal input circuit, signal processing circuit, signal selection circuit, and signal amplification circuit; The ICP signal access circuit is electrically connected to the ICP sensor, the voltage signal access circuit is electrically connected to an external voltage source, and the bridge voltage signal access circuit is electrically connected to an external bridge voltage signal source. The signal selection circuit is electrically connected to the ICP signal access circuit, the voltage signal access circuit, and the bridge voltage signal access circuit, and the signal selection circuit is electrically connected to the signal amplification circuit. The signal processing circuit is electrically connected to the signal selection circuit, the ICP signal access circuit, and the voltage signal access circuit. The signal processing circuit is used to block DC, filter, and amplify the ICP signal, bridge voltage signal, and voltage signal. It also responds to user commands to enable the ICP signal access circuit and the voltage signal access circuit, and sends a selection signal to the signal selection circuit. The signal selection circuit responds to the selection signal to turn on the ICP signal access circuit, the voltage signal access circuit, or the bridge voltage signal access circuit. Finally, the signal output by the ICP signal access circuit, the voltage signal access circuit, or the bridge voltage signal access circuit is transmitted to the signal amplification circuit for amplification.

[0008] In some embodiments of the present invention, the ICP signal access circuit includes at least: A constant current source, a first operational amplifier, a first switch, and a capacitor; The constant current source is electrically connected to the non-inverting input terminal of the first operational amplifier through the capacitor. The common terminal of the first switch is electrically connected to the ICP sensor, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the operational amplifier through the capacitor. The inverting input terminal and the output terminal of the operational amplifier are electrically connected; The signal processing circuit is used to control the first switch to be thrown to the normally open position in response to user commands.

[0009] In some embodiments of the present invention, the voltage signal access circuit includes: The system includes a second switch, a third switch, a fourth switch, a second operational amplifier, a third operational amplifier, a second capacitor, and a first resistor. The common terminal of the second switch is electrically connected to an external voltage signal source, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the second operational amplifier. The common terminal of the third switch is grounded, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the second operational amplifier. The output terminal of the second operational amplifier is electrically connected to the inverting input terminal of the second operational amplifier, and is also electrically connected to the non-inverting input terminal of the third operational amplifier through a filter circuit composed of the second capacitor and the first resistor. The common terminal of the fourth switch is electrically connected to the inverting input terminal of the second operational amplifier, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the third operational amplifier. The inverting input terminal of the third operational amplifier is electrically connected to the output terminal of the third operational amplifier; The signal processing circuit is also used to control the knife throw of the second switch, the third switch, or the fourth switch to the normally open end in response to user commands.

[0010] In some embodiments of the present invention, the signal processing circuit includes at least: a shift register, which includes at least an ICP signal terminal, a DC voltage terminal, and a zeroing terminal; The ICP signal terminal is electrically connected to the normally closed terminal of the first switch. The DC voltage terminal is electrically connected to the normally closed terminal of the third switch; The zeroing terminal is electrically connected to the normally closed terminal of the fourth switch.

[0011] In some embodiments of the present invention, the signal processing circuit further includes: an inverter, including a first output terminal and a second output terminal; The first output terminal is electrically connected to the normally closed terminal of the first switch. The second output terminal is electrically connected to the normally closed terminal of the second switch.

[0012] In some embodiments of the present invention, the shift register further includes: an enable terminal, a first signal selection terminal, and a second signal selection terminal; The signal selection circuit includes at least a signal selection chip, which includes at least a first input terminal, a second input terminal, a third input terminal, an enable receiver terminal, a first selection signal input terminal, a second selection signal input terminal, a first output terminal, and a second output terminal. Wherein, the first input terminal is electrically connected to the output terminal of the first operational amplifier, the second input terminal is electrically connected to the output terminal of the third operational amplifier, and the third input terminal is electrically connected to the output terminal of the bridge voltage signal access circuit; The enable receiver is electrically connected to the enable terminal, the first selection signal input terminal is electrically connected to the first signal selection terminal, and the second selection signal input terminal is electrically connected to the second signal selection terminal. The first output terminal and the second output terminal are electrically connected to the signal amplification circuit. The shift register is also used to generate a set of control signals at the first signal selection terminal and the second signal selection terminal in response to user instructions. The signal selection chip is used to connect the first input terminal, the second input terminal, or the third input terminal with the first output terminal and the second output terminal in response to the control signals, and finally output a set of differential signals through the first output terminal and the second output terminal.

[0013] In some embodiments of the present invention, the signal amplification circuit includes at least: an instrumentation amplification chip, and at least a signal receiving interface, a gain programming interface, and an output interface; The signal receiving interface is electrically connected to the output terminal of the signal selection circuit; The gain programming interface is connected to an external user operation terminal via a signal line and is used to configure the amplification factor of the instrument amplifier chip in response to the instructions sent by the external user operation terminal. The output interface is electrically connected to the main control chip.

[0014] In some embodiments of the present invention, the multi-type sensor vibration acquisition device further includes: The power module is electrically connected to the main control chip and is used to supply power to the main control chip.

[0015] In some embodiments of the present invention, the multi-type sensor vibration acquisition device further includes: The data storage module is communicatively connected to the main control chip and is used to store the signals sent by the main control chip; The wireless communication module is connected to the main control chip and the remote user terminal.

[0016] The beneficial effects of this invention are as follows: The multi-type sensor vibration acquisition device provided by this invention receives signals transmitted from multiple signal sources through a signal processing module. Since multiple signal acquisition ends in the signal processing module are integrated on the same device, they are subject to unified allocation by the device. There is no phase difference between different signal acquisition ends, thus effectively avoiding the problem of asynchronous signal acquisition. Furthermore, the signal processing module can also block DC and amplify the received signals, eliminating DC interference while achieving high-fidelity signal transmission, thereby achieving high-precision signal acquisition. Finally, the signal processed by the signal processing module is converted from digital to analog through an AD conversion module, and the converted signal is finally transmitted to the remote user terminal by the main control chip for evaluation. Because the high fidelity of the signal is guaranteed during transmission, the signal transmitted to the user terminal can also be evaluated more accurately and efficiently, thus effectively solving the technical problem of inaccurate evaluation when simultaneously acquiring signals from multiple types of sensors in the prior art. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the multi-type sensor vibration acquisition device provided by the present invention; Figure 2 This is a schematic diagram of the structure of an embodiment of the signal processing module provided by the present invention; Figure 3 This is a schematic diagram of an embodiment of the ICP signal access circuit provided by the present invention; Figure 4 This is a schematic diagram of a structure of an embodiment of the voltage signal access circuit provided by the present invention; Figure 5 This is a schematic diagram of the structure of an embodiment of the shift register provided by the present invention; Figure 6 This is a schematic diagram of an embodiment of the inverter provided by the present invention; Figure 7 This is a schematic diagram of a structure of an embodiment of the signal selection circuit provided by the present invention; Figure 8 This is a schematic diagram of an embodiment of the signal amplification circuit provided by the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] In the description of the embodiments of the present invention, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0021] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] This invention provides a vibration acquisition device with multiple types of sensors, which will be described below.

[0024] like Figure 1 As shown, in a first aspect, the present invention provides a multi-type sensor vibration acquisition device 10, comprising: Signal processing module 110, A / D conversion module 120, and main control chip 130; The signal processing module 110 includes several signal acquisition terminals and several signal output terminals, with the signal acquisition terminals electrically connected to several external signal sensors respectively.

[0025] It should be noted that, since existing technologies typically use several acquisition devices to acquire multiple sensor signals in parallel, the phase difference between the devices can prevent the acquired signals from achieving true synchronization. This defect is amplified, especially in high-speed acquisition scenarios. Therefore, this embodiment integrates the acquisition channels of multiple sensor signals onto the same device. When multiple sensor signals need to be acquired, these acquisition channels are uniformly allocated, effectively avoiding the asynchrony problem caused by phase difference, while also reducing hardware deployment costs and device size.

[0026] The A / D conversion module 120 includes several signal input terminals, which are electrically connected to several signal output terminals of the signal processing module 110, and the output terminal of the A / D conversion module 120 is electrically connected to the main control chip 130. The main control chip 130 is connected to the remote user terminal for communication.

[0027] It should be noted that in this embodiment, the main control chip 130 is mainly used for data transmission. Compared with the prior art, which designs transmission lines for different types of signals, the present invention uses an integrated chip, which can effectively reduce hardware costs, reduce the size of the device, make it lightweight and portable, and improve the practicality of the device.

[0028] The signal processing module 110 is used to respond to user operations by receiving signals sent by at least one signal source, performing DC blocking, filtering, and operational amplification, and then transmitting the signals to the A / D conversion module 120. The A / D conversion module 120 converts the signals into digital signals and transmits them to the main control chip 130. The main control chip 130 transmits the digital signals to the remote user terminal.

[0029] In some embodiments of the present invention, the multi-type sensor vibration acquisition device 10 further includes: The power module 140 is electrically connected to the main control chip 130 and is used to supply power to the main control chip 130. The data storage module 150 is communicatively connected to the main control chip 130 and is used to store the signals sent by the main control chip 130. The wireless communication module 160 is connected to the main control chip 130 and the remote user terminal.

[0030] Preferably, the A / D conversion module of this system uses the ADS1274 component. The ADS1274 converts the input analog signal into a digital signal, and the digital signal communicates with the main control chip via SPI. The data storage module uses an SD card and RAM. The main control chip is connected to the SD card and the wireless communication module, which can store data to the SD card or directly communicate with WIFI via serial port to store data to the user end.

[0031] Compared with existing technologies, the present invention provides a multi-type sensor vibration acquisition device that receives signals from multiple signal sources through a signal processing module and selects the signals to avoid mutual interference. Furthermore, the signal processing module can also perform DC blocking and operational amplification on the received signals, eliminating DC interference while achieving high-fidelity signal transmission, thus achieving high-precision signal acquisition. Finally, an AD conversion module performs digital-to-analog conversion on the signal processed by the signal processing module, and the converted signal is ultimately transmitted by the main control chip to a remote user terminal for evaluation. Because high-fidelity signal transmission is ensured during transmission, the signal transmitted to the user terminal can be evaluated more accurately and efficiently, effectively solving the technical problem of inaccurate evaluation when simultaneously acquiring signals from multiple types of sensors in existing technologies.

[0032] like Figure 2 In some embodiments of the present invention, the signal processing module 110 includes at least: ICP signal input circuit 111, voltage signal input circuit 112, bridge voltage signal input circuit 113, signal processing circuit 114, signal selection circuit 115, and signal amplification circuit 116; ICP signal access circuit 111 is electrically connected to the ICP sensor, voltage signal access circuit 112 is electrically connected to an external voltage source, and bridge voltage signal access circuit 113 is electrically connected to an external bridge voltage signal source. The signal selection circuit 115 is electrically connected to the ICP signal access circuit 111, the voltage signal access circuit 112 and the bridge voltage signal 113 access circuit, and the signal selection circuit 115 is electrically connected to the signal amplification circuit 116. The signal processing circuit 114 is electrically connected to the signal selection circuit 115, the ICP signal access circuit 111, and the voltage signal access circuit 112. The signal processing circuit 114 is used to block DC, filter, and amplify the ICP signal, bridge voltage signal, and voltage signal. It also responds to user commands to enable the ICP signal access circuit 111 and the voltage signal access circuit 112 and send a selection signal to the signal selection circuit 115. The signal selection circuit 115 responds to the selection signal to turn on the ICP signal access circuit 111, the voltage signal access circuit 112, or the bridge voltage signal access circuit 113. Finally, the signal output from the ICP signal access circuit 111, the voltage signal access circuit 112, or the bridge voltage signal access circuit 113 is transmitted to the signal amplification circuit 116 for amplification.

[0033] Specifically, such as Figure 3 The ICP signal access circuit 111 includes at least: The components include a constant current source U17, a first operational amplifier U16.1, a first switch U28.5, and a capacitor C77. The constant current source U17 is electrically connected to the non-inverting input terminal of the first operational amplifier U16.1 through capacitor C77.

[0034] Preferably, the constant current source U17 adopts a three-terminal adjustable constant current source LM334, whose output current is adjustable from 1μA to 10mA, and the power supply voltage range is 1V to 40V. The output current (I134) of LM134 is... SET It is determined by the following formula: (1) Among them, V SENSE It is the reference voltage of the constant current source device (64mV at 25°C), R SET These are externally set resistors. When both R81 and R82 are 32Ω, the total resistance R is satisfied. SET =16Ω, making the output current 4mA.

[0035] The common terminal of the first switch U28.5 is electrically connected to the ICP sensor, the normally closed terminal is electrically connected to the signal processing circuit 114, and the normally open terminal is electrically connected to the non-inverting input terminal of the operational amplifier U16.1 through the capacitor C77. The inverting input and output terminals of operational amplifier U16.1 are electrically connected; The signal processing circuit 114 is used to control the first switch U28.5 to the normally open position in response to user commands.

[0036] Preferably, the ICP signal access circuit is built based on the ADA4661 operational amplifier and is used for signal conditioning and control of the ICP sensor. When CH1_ICP is enabled, switch U28.5 closes, connecting channel CH1-S to the ICP sensor. A 24V constant current source composed of LM334 powers the sensor. The sensor output signal first passes through the DC blocking capacitor C96 to filter out DC bias, and then is buffered by the voltage follower configured with the operational amplifier ADA4661, finally yielding the low-impedance ICP voltage signal CH1_ICP_V. Resistor R87 provides high input impedance to match the sensor characteristics, and R81 and R82 are used to adjust the stable 4mA operating current output of the constant current source to ensure normal operation of the ICP sensor. The circuit eliminates DC interference through the DC blocking capacitor and, combined with the operational amplifier follower, achieves high-fidelity signal transmission, enabling high-precision sensor signal acquisition.

[0037] like Figure 4 In some embodiments of the present invention, the voltage signal access circuit 112 includes: The components are: second switch U28.3, third switch U28.4, fourth switch U28.2, second operational amplifier U19.1, third operational amplifier U19.2, second capacitor C81, and first resistor R84. Among them, the common terminal of the second switch U28.3 is electrically connected to the external voltage signal source, the normally closed terminal is electrically connected to the signal processing circuit 114, and the normally open terminal is electrically connected to the non-inverting input terminal of the second operational amplifier U19.1; The common terminal of the third switch U28.4 is grounded, the normally closed terminal is electrically connected to the signal processing circuit 114, and the normally open terminal is electrically connected to the non-inverting input terminal of the second operational amplifier U19.1. The output terminal of the second operational amplifier U19.1 is electrically connected to the inverting input terminal of the second operational amplifier U19.1, and is also electrically connected to the non-inverting input terminal of the third operational amplifier U19.2 through a filter circuit composed of the second capacitor C81 and the first resistor R84. The common terminal of the fourth switch U28.2 is electrically connected to the inverting input terminal of the second operational amplifier U19.1, the normally closed terminal is electrically connected to the signal processing circuit 114, and the normally open terminal is electrically connected to the non-inverting input terminal of the third operational amplifier U19.2. The inverting input terminal of the third operational amplifier U19.2 is electrically connected to the output terminal of the third operational amplifier U19.2; The signal processing circuit 114 is also used to control the knife throw of the second switch U28.3, the third switch U28.4, and the fourth switch U28.2 to the normally open end in response to user commands.

[0038] It should be noted that the voltage signal input circuit is also based on the ADA4661 operational amplifier. The control signal CH1_ICP_NOT closes the switch to select the external voltage signal input, and CH1_VOL_DC switches between DC and AC coupling modes: in DC mode, the signal is directly output to CH1_V via the operational amplifier follower; in AC mode, it is output after DC blocking by capacitor C81. The zero-calibration function (CH1_0V enabled) calibrates the system zero point by grounding the input. The circuit flexibly switches the signal path using an analog switch, and combines resistor R84 and capacitor C81 to achieve high-pass filtering, ensuring high-precision signal conditioning.

[0039] like Figure 5 In some embodiments of the present invention, the signal processing circuit 114 includes at least: a shift register U18, which includes at least an ICP signal terminal, a DC voltage terminal, a zeroing terminal, an enable terminal, a first signal selection terminal, and a second signal selection terminal; The ICP signal terminal is electrically connected to the normally closed terminal of the first switch U28.5; The DC voltage terminal is electrically connected to the normally closed terminal of the third switch U28.4; The zero-calibration terminal is electrically connected to the normally closed terminal of the fourth switch U28.2.

[0040] Preferably, the shift register in this system uses the 74HC595 chip, which is an 8-bit serial input / serial or parallel output shift register with a latched tri-state output. It allows multiple parallel outputs to be controlled through three I / O pins (data input, clock, and latch clock), which can solve the problem of insufficient I / O pins of the microcontroller and realize the function of controlling multiple signal inputs with a few I / O ports. There are 4 signals in this system, and each signal requires 6 selection signals (enable signal, DC voltage, ICP signal, zeroing signal, and 2 channel selection signals). 4 channels require 24 signals. If the microcontroller has insufficient I / O pins or too many lines, the PCB design will be difficult. Therefore, four 74HC595 serial-to-parallel converter chips are cascaded, which only requires 3 I / O pins to control 4 signals. The chip outputs the input signal on the DS pin to the Q0-Q7 pins.

[0041] Specifically, each output function includes: CH1_EN is responsible for enabling the switch to select the signal source; CH1_A0 and CH1_A1 are responsible for controlling the selection of the signal source; CH1_ICP controls the on / off state of the ICP circuit; and CH1_VOL_DC and CH1_0V are responsible for controlling the voltage signal input circuit.

[0042] like Figure 6 In some embodiments of the present invention, the signal processing circuit 114 further includes an inverter U21, which includes a first output terminal and a second output terminal; The first output terminal is electrically connected to the normally closed terminal of the first switch U28.5; The second output terminal is electrically connected to the normally closed terminal of the second switch U28.3.

[0043] Specifically, the inverter outputs a pair of inverted signals, CH1_ICP and CH1_ICP_NOT, which are connected to the ICP circuit and the voltage signal circuit, respectively, to control the on / off state of the circuit. When CH1_ICP is enabled, the switch in the diagram is closed, CH1-S is connected to the ICP sensor, and a 24V constant current source powers the ICP sensor. The ICP signal passes through a DC blocking capacitor and an operational amplifier to output the ICP voltage signal. When CH1_ICP_NOT is enabled, the voltage signal is selected for acquisition. CH1_ICP and CH1_ICP_NOT are an inverted pair of signals, ensuring that either the ICP signal or the voltage signal is acquired, preventing damage to the sensor if the voltage sensor is connected when acquiring the ICP signal.

[0044] It should be noted that the bridge voltage signal can be directly connected and coupled with the two signals mentioned above into the signal selection circuit. The signal selection circuit can be configured according to the actual sensor connection situation to ensure that the circuit is unobstructed.

[0045] After passing through the above signal processing circuit, the three signals are coupled together, such as Figure 7The signal selection circuit 115 includes at least: a signal selection chip U15, which includes at least a first input terminal, a second input terminal, a third input terminal, an enable receiver terminal, a first selection signal input terminal, a second selection signal input terminal, a first output terminal, and a second output terminal; The first input terminal is electrically connected to the output terminal of the first operational amplifier U16.1, the second input terminal is electrically connected to the output terminal of the third operational amplifier U19.2, and the third input terminal is electrically connected to the output terminal of the bridge voltage signal access circuit 113. The enable receiver is electrically connected to the enable terminal, the first selection signal input terminal is electrically connected to the first signal selection terminal, and the second selection signal input terminal is electrically connected to the second signal selection terminal. The first output terminal and the second output terminal are electrically connected to the signal amplification circuit 116; The shift register U18 is also used to generate a set of control signals in response to user instructions at the first signal selection terminal and the second signal selection terminal. The signal selection chip U15 is used to connect the first input terminal, the second input terminal, or the third input terminal with the first output terminal and the second output terminal in response to the control signals, and finally output a set of differential signals through the first output terminal and the second output terminal.

[0046] Specifically, the signal selection chip U15 uses ADG5409 to switch different signal sources to the test circuit. There are three signal sources connected: ICP signal CH1_ICP_V, voltage signal CH1_V and bridge voltage signal. The type of signal to be output can be controlled by controlling the input values ​​of inputs A0 and A1. Finally, a pair of differential signals -INA_S1 and +INA_S1 are output.

[0047] Table 1 Control Logic for Selecting Signals

[0048] This system only involves three signal source inputs, so channel 3 is not used. S1B and S2B are both grounded because the corresponding input is a single-ended signal.

[0049] Since both the bridge voltage signal and the ICP signal voltage are in the mV range, they need to be amplified, such as... Figure 8 In some embodiments of the present invention, the signal amplification circuit 116 includes at least: an instrumentation amplification chip U1, which includes at least a signal receiving interface, a gain programming interface and an output interface; The signal receiving interface is electrically connected to the output terminal of the signal selection circuit 115. The gain programming interface communicates with the external user terminal via signal lines and is used to configure the amplification factor of the instrument amplifier chip U1 in response to commands sent by the external user terminal. The output interface is electrically connected to the main control chip 130.

[0050] Specifically, the ADG8231, as an instrumentation amplifier chip, can amplify the input differential signal (-INA_S1, +INA_S2) with an amplification factor from 1 to 128. The amplification factor is controlled by three signal lines GAIN_A0, GAIN_A1, and GAIN_A2. The specific amplification accuracy can be configured according to your own needs, and the final output is the amplified signal S1_OUT.

[0051] Furthermore, as described above, the four input signals are amplified and named S1_OUT, S2_OUT, S3_OUT, and S4_OUT respectively. The four outputs form a pair of differential signals with the reference voltage and are then connected to the A / D conversion module.

[0052] The above provides a detailed description of a multi-type sensor vibration acquisition device provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A vibration acquisition device with multiple sensor types, characterized in that, include: Signal processing module, A / D conversion module, and main control chip; The signal processing module includes several signal acquisition terminals and several signal output terminals corresponding to the several signal acquisition terminals. The several signal acquisition terminals are electrically connected to several external signal sensors respectively. The A / D conversion module includes several signal input terminals, which are electrically connected to several signal output terminals of the signal processing module, and the output terminal of the A / D conversion module is electrically connected to the main control chip. The main control chip is connected to the remote user terminal for communication. The signal processing module is used to respond to user operations and simultaneously activate several corresponding signal acquisition terminals to receive signals sent by signal sensors, perform DC blocking, filtering, and operational amplification, and then transmit the signals to the A / D conversion module. The A / D conversion module converts the DC-blocked, filtered, and operational amplified signals into digital signals and transmits them to the main control chip. The main control chip then transmits the digital signals to the remote user terminal.

2. The multi-type sensor vibration acquisition device according to claim 1, characterized in that, The signal processing module includes at least: ICP signal input circuit, voltage signal input circuit, bridge voltage signal input circuit, signal processing circuit, signal selection circuit, and signal amplification circuit; The ICP signal access circuit is electrically connected to the ICP sensor, the voltage signal access circuit is electrically connected to an external voltage source, and the bridge voltage signal access circuit is electrically connected to an external bridge voltage signal source. The signal selection circuit is electrically connected to the ICP signal access circuit, the voltage signal access circuit, and the bridge voltage signal access circuit, and the signal selection circuit is electrically connected to the signal amplification circuit. The signal processing circuit is electrically connected to the signal selection circuit, the ICP signal access circuit, and the voltage signal access circuit. The signal processing circuit is used to block DC, filter, and amplify the ICP signal, bridge voltage signal, and voltage signal. It also responds to user commands to enable the ICP signal access circuit and the voltage signal access circuit and send a selection signal to the signal selection circuit. The signal selection circuit responds to the selection signal to turn on the ICP signal access circuit, the voltage signal access circuit, or the bridge voltage signal access circuit. Finally, the signal output by the ICP signal access circuit, the voltage signal access circuit, or the bridge voltage signal access circuit is transmitted to the signal amplification circuit for amplification.

3. The multi-type sensor vibration acquisition device according to claim 2, characterized in that, The ICP signal access circuit includes at least: A constant current source, a first operational amplifier, a first switch, and a capacitor; The constant current source is electrically connected to the non-inverting input terminal of the first operational amplifier through the capacitor. The common terminal of the first switch is electrically connected to the ICP sensor, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the operational amplifier through the capacitor. The inverting input terminal and the output terminal of the operational amplifier are electrically connected; The signal processing circuit is used to control the first switch to be thrown to the normally open position in response to user commands.

4. The multi-type sensor vibration acquisition device according to claim 3, characterized in that, The voltage signal access circuit includes: The system includes a second switch, a third switch, a fourth switch, a second operational amplifier, a third operational amplifier, a second capacitor, and a first resistor. The common terminal of the second switch is electrically connected to an external voltage signal source, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the second operational amplifier. The common terminal of the third switch is grounded, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the second operational amplifier. The output terminal of the second operational amplifier is electrically connected to the inverting input terminal of the second operational amplifier, and is also electrically connected to the non-inverting input terminal of the third operational amplifier through a filter circuit composed of the second capacitor and the first resistor. The common terminal of the fourth switch is electrically connected to the inverting input terminal of the second operational amplifier, the normally closed terminal is electrically connected to the signal processing circuit, and the normally open terminal is electrically connected to the non-inverting input terminal of the third operational amplifier. The inverting input terminal of the third operational amplifier is electrically connected to the output terminal of the third operational amplifier; The signal processing circuit is also used to control the knife throw of the second switch, the third switch, or the fourth switch to the normally open end in response to user commands.

5. The multi-type sensor vibration acquisition device according to any one of claims 4, characterized in that, The signal processing circuit includes at least: a shift register, which includes at least an ICP signal terminal, a DC voltage terminal, and a zeroing terminal; The ICP signal terminal is electrically connected to the normally closed terminal of the first switch. The DC voltage terminal is electrically connected to the normally closed terminal of the third switch; The zeroing terminal is electrically connected to the normally closed terminal of the fourth switch.

6. The multi-type sensor vibration acquisition device according to claim 5, characterized in that, The signal processing circuit further includes: an inverter, comprising a first output terminal and a second output terminal; The first output terminal is electrically connected to the normally closed terminal of the first switch. The second output terminal is electrically connected to the normally closed terminal of the second switch.

7. The multi-type sensor vibration acquisition device according to claim 5, characterized in that, The shift register further includes: an enable terminal, a first signal selection terminal, and a second signal selection terminal; The signal selection circuit includes at least a signal selection chip, which includes at least a first input terminal, a second input terminal, a third input terminal, an enable receiver terminal, a first selection signal input terminal, a second selection signal input terminal, a first output terminal, and a second output terminal. Wherein, the first input terminal is electrically connected to the output terminal of the first operational amplifier, the second input terminal is electrically connected to the output terminal of the third operational amplifier, and the third input terminal is electrically connected to the output terminal of the bridge voltage signal access circuit; The enable receiver is electrically connected to the enable terminal, the first selection signal input terminal is electrically connected to the first signal selection terminal, and the second selection signal input terminal is electrically connected to the second signal selection terminal. The first output terminal and the second output terminal are electrically connected to the signal amplification circuit. The shift register is also used to generate a set of control signals at the first signal selection terminal and the second signal selection terminal in response to user instructions. The signal selection chip is used to connect the first input terminal, the second input terminal, or the third input terminal with the first output terminal and the second output terminal in response to the control signals, and finally output a set of differential signals through the first output terminal and the second output terminal.

8. The multi-type sensor vibration acquisition device according to claim 2, characterized in that, The signal amplification circuit includes at least: an instrumentation amplification chip, and at least a signal receiving interface, a gain programming interface, and an output interface; The signal receiving interface is electrically connected to the output terminal of the signal selection circuit; The gain programming interface is connected to an external user operation terminal via a signal line and is used to configure the amplification factor of the instrument amplification chip in response to the instructions sent by the external user operation terminal. The output interface is electrically connected to the main control chip.

9. The multi-type sensor vibration acquisition device according to claim 1, characterized in that, The multi-type sensor vibration acquisition device also includes: The power module is electrically connected to the main control chip and is used to supply power to the main control chip.

10. The multi-type sensor vibration acquisition device according to claim 1, characterized in that, The multi-type sensor vibration acquisition device also includes: The data storage module is communicatively connected to the main control chip and is used to store the signals sent by the main control chip; The wireless communication module is connected to the main control chip and the remote user terminal.

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