Vibration signal detection device and vehicle-mounted vibration detection system

Abstract

The utility model discloses a vibration signal detection device and a vehicle-mounted vibration detection system, and belongs to the technical field of power electronics, the detection device comprises a plurality of vibration sensors, a constant current source, and a signal processing module used for removing direct current bias components and high-frequency noise signals in output signals of the plurality of vibration sensors; the plurality of signal amplification modules are connected with the signal processing module through a multi-channel selection switch and are used for generating different amplification gains; the controller is used for determining connection channels between the multi-channel selection switch and the plurality of signal amplification modules according to the signal intensity of the signal output by the signal processing module; and the data display module is connected with the plurality of signal amplification modules and is used for displaying the amplified signals output by the plurality of signal amplification modules. The detection device not only can improve the accuracy and reliability of the detection result when the precise instrument is subjected to vibration detection, but also can accurately evaluate the influence of the vibration parameters on the precise instrument.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a vibration signal detection device and a vehicle-mounted vibration detection system. Background Art

[0002] Precision instruments usually have many precision mechanical parts and electronic devices. During the transportation of precision instruments, the internal mechanical parts will resonate due to bumps and vibrations, thus affecting the working performance of the precision instruments. In order to reduce the damage to precision instruments during transportation, it is usually necessary to use a vibration signal detection device to detect the vibration force of the precision instruments during transportation, and design appropriate shock absorption equipment based on the detection results.

[0003] See also Figure 1 , Figure 1 The structure diagram of a vibration signal detection device in the prior art is shown in FIG. Figure 1 The detection device shown is provided with a power supply 10, a vibration sensor 20, a preamplifier 30, a main amplifier circuit 40 and a comparison circuit 50, wherein the main amplifier circuit 40 is provided with a first amplifier circuit 60 and a second amplifier circuit 70. In the detection device, the vibration sensor 20 is used to detect the vibration force received by a certain part of the precision instrument, and then the preamplifier circuit 30 and the main amplifier circuit 40 amplify the signal of the vibration force received by the precision instrument, and the vibration force received by the precision instrument is evaluated according to the amplified vibration signal.

[0004] However, in Figure 1 In the detection device shown, the vibration sensor 20 is powered by the power supply 10. Once the load value in the circuit changes, the power supply current in the circuit will fluctuate, which will affect the accuracy and reliability of the detection result when the detection device performs vibration detection on the precision instrument. In addition, the detection device can only detect one part of the precision instrument, and cannot detect the vibration conditions of various components on the precision instrument at the same time, and thus cannot accurately evaluate the impact of vibration parameters on the precision instrument. At present, there is no more effective solution to this technical problem. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a vibration signal detection device and a vehicle-mounted vibration detection system to solve the technical problems in the prior art that the vibration force exerted on the precision instrument cannot be accurately detected, and the influence of the vibration parameters on the precision instrument cannot be accurately evaluated. The specific scheme is as follows:

[0006] In order to solve the above technical problems, the utility model provides a vibration signal detection device, comprising:

[0007] Multiple vibration sensors;

[0008] A constant current source connected to the multiple vibration sensors and used to power the multiple vibration sensors;

[0009] A signal processing module connected to the constant current source and used to remove DC bias components and high-frequency noise signals;

[0010] Connected to the signal processing module via a multi-channel selection switch, used to generate multiple signal amplification modules with different amplification gains;

[0011] A controller connected to the multi-channel selection switch and used to determine the connection channels between the multi-channel selection switch and the plurality of signal amplification modules according to the signal strength of the output signal of the signal processing module;

[0012] A data display module connected to the multiple signal amplification modules and used for displaying the amplified signals output by the multiple signal amplification modules.

[0013] Preferably, the constant current source comprises: a voltage monitoring circuit, a first resistor, a second resistor and a transistor;

[0014] Wherein, the first end of the first resistor is respectively connected to the positive electrode of the first DC power supply and the input end of the target vibration sensor, the second end of the first resistor is respectively connected to the first end of the voltage monitoring circuit and the base of the transistor, the emitter of the transistor is respectively connected to the first end of the second resistor and the second end of the voltage monitoring circuit, and the collector of the transistor is connected to the output end of the target vibration sensor; the target vibration sensor is any one of a plurality of vibration sensors;

[0015] Correspondingly, the negative electrode of the first DC power supply is grounded.

[0016] Preferably, the signal processing module includes:

[0017] A plurality of debiasing circuits connected to the constant current source and used for respectively removing DC bias components in output signals of a plurality of vibration sensors;

[0018] A low-pass filter circuit is connected to the multiple de-biasing circuits and is used to remove high-frequency noise signals in the output signals of the multiple de-biasing circuits.

[0019] Preferably, the de-biasing circuit comprises: a first capacitor, a second capacitor, a third resistor, a fourth resistor and an operational amplifier;

[0020] Wherein, the second end of the first capacitor is respectively connected to the first end of the second capacitor and the first end of the third resistor, the second end of the third resistor is respectively connected to the first input end and the output end of the operational amplifier, the second end of the second capacitor is respectively connected to the first end of the fourth resistor and the second input end of the operational amplifier, and the second end of the fourth resistor is grounded;

[0021] Correspondingly, the first end of the first capacitor is connected to the constant current source.

[0022] Preferably, the multi-channel selection switch comprises: a controllable switch and a relay unit composed of a plurality of relays connected in parallel;

[0023] The output end of the relay unit is connected to the positive electrode of the second DC power supply, the input end of the relay unit is connected to the control end of the controllable switch, the first end of the controllable switch is grounded, and the second end of the controllable switch is connected to the controller;

[0024] Correspondingly, the negative electrode of the second DC power supply is grounded, the output ends of the plurality of relays together constitute the output end of the relay unit, and the control ends of the plurality of relays together constitute the input end of the relay unit.

[0025] Preferably, the plurality of signal amplification modules include:

[0026] A first amplifier circuit having an amplification gain of a first preset threshold;

[0027] A second amplifier circuit with an amplification gain of a second preset threshold; wherein the first preset threshold and the second preset threshold are set according to the property characteristics of the equipment to be detected to which the multiple vibration sensors are connected.

[0028] Preferably, the data display module includes:

[0029] An analog-to-digital converter for performing analog-to-digital conversion on the amplified signals output by the plurality of signal amplification modules to obtain a target conversion signal;

[0030] The controller is connected to the analog-to-digital converter and is used to collect the target conversion signal to obtain the target collection signal;

[0031] A host computer connected to the controller and used to obtain the target acquisition signal and display the target acquisition signal.

[0032] Preferably, the host computer includes:

[0033] A display screen for displaying the target acquisition signal;

[0034] A button connected to the display screen, used to control the display screen to display the amplified signal output by the target signal amplifying module; wherein the target signal amplifying module is any one of the multiple signal amplifying modules.

[0035] Preferably, the controller further includes:

[0036] Filter module used to filter out noise signals.

[0037] In order to solve the above technical problems, the utility model also provides a vehicle-mounted vibration detection system, including a vibration signal detection device as disclosed above.

[0038] Beneficial effects: Compared with the prior art, since the detection device uses a constant current source to power the vibration sensor, the stability of the power supply current of the vibration sensor during the detection of precision instruments can be ensured. At the same time, the vibration signal detected by the vibration sensor can be amplified to different degrees through multiple signal amplification modules, which can significantly improve the accuracy and reliability of the detection results of the detection device when performing vibration detection on precision instruments. In addition, the detection device is provided with multiple vibration sensors, multiple signal amplification modules with different amplification gains, and a data display module capable of displaying the amplified signals output by multiple signal amplification modules, so that the staff can detect and view the vibration forces exerted on multiple components of the precision instrument at the same time, and can clearly and intuitively view the vibration changes exerted on each component of the precision instrument through the data display module, thereby accurately evaluating the influence of vibration parameters on the precision instrument. Correspondingly, the vehicle-mounted vibration detection system provided by the utility model also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0040] Figure 1 It is a structural diagram of a vibration signal detection device in the prior art;

[0041] Figure 2 A structural diagram of a vibration signal detection device provided by an embodiment of the utility model;

[0042] Figure 3 A structural diagram of another vibration signal detection device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] See also Figure 2 , Figure 2 A structural diagram of a vibration signal detection device provided by an embodiment of the utility model, the detection device comprises:

[0045] A plurality of vibration sensors 11;

[0046] A constant current source 12 connected to the plurality of vibration sensors 11 and used to supply power to the plurality of vibration sensors 11;

[0047] A signal processing module 13 connected to the constant current source 12 and used to remove DC bias components and high-frequency noise signals;

[0048] Connected to the signal processing module 13 via a multi-channel selection switch 14, for generating a plurality of signal amplification modules 15 with different amplification gains;

[0049] A controller 16 connected to the multi-channel selection switch 14 and used to determine the connection channels between the multi-channel selection switch 14 and the plurality of signal amplification modules 15 according to the signal strength of the output signal of the signal processing module 13;

[0050] A data display module 17 is connected to the plurality of signal amplifying modules 15 and is used to display the amplified signals output by the plurality of signal amplifying modules 15 .

[0051] In this embodiment, a vibration signal detection device is provided. The detection device can not only improve the accuracy and reliability of the detection results when performing vibration detection on precision instruments, but also accurately evaluate the influence of vibration parameters on precision instruments.

[0052] In the detection device, multiple vibration sensors 11, constant current sources 12, signal processing modules 13, multiple signal amplification modules 15, multi-channel selection switches 14, controllers 16 and data display modules 17 are provided. Among them, multiple vibration sensors 11 are used to detect the vibration force exerted on various components of the precision instrument; the constant current source 12 is used to power the multiple vibration sensors 11; the signal processing module 13 is used to remove the DC component and high-frequency noise signal in the output signal of the multiple vibration sensors 11, so that the subsequent circuit can analyze and process the vibration signal detected by the vibration sensor 11; the multiple signal amplification modules 15 are used to amplify the vibration signal detected by the vibration sensor 11 using different amplification gains; and the data display module 17 will display the amplified signals output by the multiple signal amplification modules 15.

[0053] It should be noted that, in this embodiment, the precision instrument may be a mass spectrometer, a spectrum analyzer, an oscilloscope, etc. Before the signal amplification module 15 is used to amplify the vibration signal detected by the vibration sensor 11, the controller 16 determines which signal amplification module 15 the multi-channel selection switch 14 is connected to according to the signal strength of the signal output by the signal processing module 13.

[0054] It can be understood that since the amplification gains of the multiple signal amplification modules 15 are different, and the strengths of the vibration signals detected by the multiple vibration sensors 11 are also different, therefore, in practical applications, it is possible to choose whether to transmit the vibration signal to the signal amplification module 15 with a higher amplification gain for signal amplification, or to transmit the vibration signal to the signal amplification module 15 with a smaller amplification gain for signal amplification, according to the strength of the vibration signal detected by the vibration sensor 11. Here, as long as the purpose of accurately analyzing the vibration signal can be achieved, it will be sufficient.

[0055] For example, if the vibration signal detected by the vibration sensor 11 is weak, the controller 16 will control the multi-channel selection switch 14 to connect to the signal amplification module 15 with a larger amplification gain, and use the larger amplification gain to amplify the small signal detected by the vibration sensor 11. If the vibration signal detected by the vibration sensor 11 is strong, the controller 16 will control the multi-channel selection switch 14 to connect to the signal amplification module 15 with a smaller amplification gain, and use the smaller amplification gain to amplify the large signal detected by the vibration sensor 11.

[0056] In addition, in practical applications, when the number of vibration sensors 11 and the number of signal amplification modules 15 are set in the detection device, they can be set according to the actual needs of the precision instrument to be detected, and are not specifically limited here.

[0057] Obviously, when multiple vibration sensors 11 and multiple signal amplification modules 15 are set in the detection device, signal amplification channels with different amplification gain levels can be selected in different vibration environments according to actual detection requirements to amplify the detected vibration signals. In addition, the staff can use the data display module 17 in the detection device to more intuitively and clearly view the vibration changes of various components on the precision instrument, eliminate the resonance points of various components on the precision instrument, and accurately evaluate the impact of vibration parameters on the precision instrument, which makes the detection device provided by this application more practical.

[0058] Compared with the prior art, since the detection device uses a constant current source to power the vibration sensor, the stability of the power supply current of the vibration sensor during the detection of the precision instrument can be ensured. At the same time, the vibration signal detected by the vibration sensor can be amplified to different degrees through multiple signal amplification modules, which can significantly improve the accuracy and reliability of the detection results of the detection device when performing vibration detection on the precision instrument. In addition, the detection device is provided with multiple vibration sensors, multiple signal amplification modules with different amplification gains, and a data display module capable of displaying the amplified signals output by the multiple signal amplification modules, so that the staff can detect and view the vibration forces exerted on multiple components on the precision instrument at the same time, and can clearly and intuitively view the vibration changes exerted on each component on the precision instrument through the data display module, thereby accurately evaluating the influence of the vibration parameters on the precision instrument.

[0059] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. Figure 3 , Figure 3 This is a structural diagram of another vibration signal detection device provided by an embodiment of the utility model. As a preferred embodiment, the constant current source 12 comprises: a voltage monitoring circuit 201, a first resistor R1, a second resistor R2 and a transistor Q1;

[0060] Wherein, the first end of the first resistor R1 is respectively connected to the positive electrode of the first DC power supply DC1 and the input end of the target vibration sensor, the second end of the first resistor R1 is respectively connected to the first end of the voltage monitoring circuit 201 and the base of the transistor Q1, the emitter of the transistor Q1 is respectively connected to the first end of the second resistor R2 and the second end of the voltage monitoring circuit 201, and the collector of the transistor Q1 is connected to the output end of the target vibration sensor; the target vibration sensor is any one of the multiple vibration sensors;

[0061] Correspondingly, the negative electrode of the first DC power supply DC1 is grounded.

[0062] In this embodiment, a specific configuration of a constant current source 12 is provided. The constant current source 12 is composed of a voltage monitoring circuit 201, a first resistor R1, a second resistor R2 and a transistor Q1, wherein the first resistor R1 is a feedback resistor and the second resistor R2 is a driving circuit.

[0063] When the constant current source 12 is used to power multiple vibration sensors, the accuracy of the vibration signals detected by the vibration sensors can be further improved. The constant current source 12 can be used to convert the vibration signals output by the multiple vibration sensors into more stable signals with less fluctuations and output them to the next level circuit, thereby improving the accuracy of the detection results when the detection device performs vibration detection on precision instruments.

[0064] It should be noted that, in this embodiment, the connection relationship between a vibration sensor and a constant current source is taken as an example for specific description, and the connection relationship between other vibration sensors and constant current sources is the same as Figure 3 The circuit connection relationship shown remains the same and will not be described in detail here.

[0065] Obviously, through the technical solution provided in this embodiment, a stable and reliable power source can be provided for multiple vibration sensors.

[0066] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. Figure 3 , Figure 3 This is a structural diagram of another vibration signal detection device provided by an embodiment of the utility model. As a preferred implementation, the signal processing module 13 includes:

[0067] A plurality of debiasing circuits 301 connected to the constant current source 12 and used for respectively removing DC bias components in output signals of the plurality of vibration sensors 11;

[0068] A low-pass filter circuit 302 is connected to the multiple de-biasing circuits 301 and is used to remove high-frequency noise signals in the output signals of the multiple de-biasing circuits 301 .

[0069] In this embodiment, in order to allow the subsequent circuit to better analyze and process the vibration signal detected by the vibration sensor 11 , a plurality of de-biasing circuits 301 and low-pass filtering circuits 302 are provided in the signal processing module 13 .

[0070] Among them, the multiple debiasing circuits 301 are used to respectively remove the DC bias components existing in the output signals of the multiple vibration sensors 11. The low-pass filter circuit 302 is used to remove the high-frequency noise signal in the signal output by the debiasing circuit 301, so that the quality of the vibration signal detected by the vibration sensor 11 is smoother and clearer. It should be noted that the high-frequency noise signal here includes both: the high-frequency noise signal existing in the AC signal output by the debiasing circuit 301, and the high-frequency noise signal generated during the transmission process.

[0071] As a preferred implementation, the above-mentioned de-biasing circuit 301 includes: a first capacitor C1, a second capacitor C2, a third resistor R3, a fourth resistor R4 and an operational amplifier U;

[0072] The second end of the first capacitor C1 is connected to the first end of the second capacitor C2 and the first end of the third resistor R3 respectively, the second end of the third resistor R3 is connected to the first input end and the output end of the operational amplifier U respectively, the second end of the second capacitor C2 is connected to the first end of the fourth resistor R4 and the second input end of the operational amplifier U respectively, and the second end of the fourth resistor R4 is grounded;

[0073] Correspondingly, the first end of the first capacitor C1 is connected to the constant current source 12 .

[0074] In this embodiment, the structure of the de-biasing circuit 301 is specifically described. The de-biasing circuit 301 includes: a first capacitor C1, a second capacitor C2, a third resistor R3, a fourth resistor R4 and an operational amplifier U. The de-biasing circuit 301 can filter out the DC bias component in the vibration signal detected by the vibration sensor 11, and convert the vibration signal output by the vibration sensor 11 into an alternating signal crossing the zero point, and can also filter out the signal that causes resonance to the operational amplifier U, thereby facilitating the processing of the subsequent circuit.

[0075] It should be noted that in Figure 3 In the detection device shown in FIG. 1 , only a circuit diagram of a debiasing circuit 301 is shown. The structures of other debiasing circuits 301 are similar to those of FIG. Figure 3 The structure diagram of the de-biasing circuit 301 is the same and will not be described in detail here.

[0076] Obviously, through the technical solution provided in this embodiment, the DC bias component and high-frequency noise signal in the vibration signal detected by the vibration sensor can be filtered out, and the processing of subsequent processes is facilitated.

[0077] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. Figure 3 , Figure 3A structural diagram of another vibration signal detection device provided by an embodiment of the utility model. As a preferred embodiment, the multi-channel selection switch 14 comprises: a second DC power supply DC2, a controllable switch 401 and a relay unit 402 composed of a plurality of relays connected in parallel;

[0078] The output end of the relay unit 402 is connected to the positive electrode of the second DC power supply DC2, the input end of the relay unit 402 is connected to the control end of the controllable switch 401, the first end of the controllable switch 401 is grounded, and the second end of the controllable switch 401 is connected to the controller;

[0079] Correspondingly, the negative electrode of the second DC power supply DC2 is grounded, the output ends of the plurality of relays together constitute the output end of the relay unit 402 , and the control ends of the plurality of relays together constitute the input end of the relay unit 402 .

[0080] In practical applications, a second DC power supply DC2, a controllable switch 401 and multiple relays can be used to build a multi-channel selection switch 14. The controller can control the energized state of the relay through the controllable switch 401, and select the signal processing module to be connected to which signal amplification module with a specific amplification gain through the energized state of the relay.

[0081] Obviously, through the technical solution provided in this embodiment, the signal processing module can establish a communication connection with different signal amplification modules.

[0082] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. Figure 3 , Figure 3 This is a structural diagram of another vibration signal detection device provided by an embodiment of the utility model. As a preferred embodiment, the above-mentioned multiple signal amplification modules 15 include:

[0083] A first amplifier circuit 501 having an amplification gain of a first preset threshold;

[0084] The amplification gain of the second amplifier circuit 502 is a second preset threshold value; wherein the first preset threshold value and the second preset threshold value are set according to the property characteristics of the equipment to be detected to which the multiple vibration sensors are connected.

[0085] In practical applications, the vibration signals detected by the vibration sensor can basically be divided into two categories, one is a small signal with a weak signal strength, and the other is a large signal with a strong signal strength. Therefore, in this embodiment, multiple signal amplification modules can be set as two amplification circuits with different amplification gains. That is, a first amplification circuit 501 and a second amplification circuit 502 can be set in the detection device, wherein the amplification gain of the first amplification circuit 501 is a first preset threshold, and the amplification gain of the second amplification circuit 502 is a second preset threshold.

[0086] The first preset threshold and the second preset threshold can be set according to the property characteristics of the devices to be detected to which the multiple vibration sensors are connected. For example, if the device to be detected is a mass spectrometer, the first preset threshold can be set to 10, and the second preset threshold can be set to 100.

[0087] In this case, the detection modes in the detection device can be divided into: a weak, high-precision, small-amplitude detection mode and a strong, low-precision, large-amplitude detection mode. Among them, the weak, high-precision, small-amplitude detection mode can be applied to situations where the vibration signal is a vibration acceleration of less than 1G, and the strong, low-precision, large-amplitude detection mode can be applied to situations where the vibration signal is a vibration acceleration of more than 100G. Through this setting, people can use the weak, high-precision, small-amplitude detection mode to select a more accurate signal amplification module to display the details of the vibration signal, and use the strong, low-precision, large-amplitude detection mode to display the overall waveform of the vibration signal to avoid distortion of the amplified signal.

[0088] Of course, in practical applications, the amplification gain corresponding to each signal amplification module can be adaptively adjusted according to different detection requirements, which will not be described in detail here.

[0089] Obviously, through the technical solution provided in this embodiment, the universality of the detection device provided in this application in practical applications can be relatively improved.

[0090] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. Figure 3 , Figure 3 This is a structural diagram of another vibration signal detection device provided by an embodiment of the utility model. As a preferred embodiment, the data display module 17 includes:

[0091] An analog-to-digital converter 701 for performing analog-to-digital conversion on the amplified signals output by the plurality of signal amplification modules to obtain a target converted signal;

[0092] A controller 16 connected to the analog-to-digital converter 701 and configured to collect the target conversion signal and obtain the target collected signal;

[0093] A host computer 702 connected to the controller 16 and configured to receive and display the target acquisition signal.

[0094] In this embodiment, the data display module is specifically described, and the data display module is provided with an analog-to-digital converter 701, a controller 16, and a host computer 702. The analog-to-digital converter 701 is used to perform analog-to-digital conversion on the amplified signals output by the multiple signal amplification modules, converting them into digital signals to obtain target conversion signals, so as to facilitate the recognition and processing of the controller 16; the controller 16 is used to collect the target conversion signals, obtain the target acquisition signals, and upload the target acquisition signals to the host computer 702; and the host computer 702 is used to display the target acquisition signals, so that the staff can observe the image data corresponding to the vibration signal through the host computer 702, and observe and analyze the vibration signals detected by the vibration sensor more accurately.

[0095] Obviously, the technical solution provided in this embodiment can further improve the user experience of the staff when observing the vibration signal detected by the vibration sensor.

[0096] As a preferred implementation, the host computer 702 includes:

[0097] A display screen for displaying target acquisition signals;

[0098] A button connected to the display screen, used to control the display screen to display the amplified signal output by the target signal amplification module; wherein the target signal amplification module is any one of the multiple signal amplification modules.

[0099] In this embodiment, in order to enable the staff to view the specific waveform of the amplified signal output by each signal amplification module at any time, a display screen and buttons can also be set in the host computer 702; wherein the display screen is used to display the target acquisition signal, and the button can control the display screen to display the amplified signal output by the target amplification module.

[0100] That is, on the display screen of the host computer 702, the staff can independently display the amplified signal output by a certain signal amplification module on the display screen through the buttons set thereon, which makes it easier for the staff to analyze and process the vibration signal detected by the vibration sensor.

[0101] Obviously, the technical solution provided by this embodiment can further improve the user experience when people use the detection device.

[0102] As a preferred embodiment, the controller 16 further includes:

[0103] Filter module used to filter out noise signals.

[0104] Since the controller 16 can determine the connection channels between the multi-channel selection switch and the multiple signal amplification modules according to the signal strength of the signal output by the signal processing module, and each signal amplification module has a different amplification gain. In this case, in order to enable the signal amplification module to better amplify and process the signal output by the signal processing module, a filtering module can also be set in the controller 16, and the filtering module can be used to remove the burr signal and the noise signal in the signal input to a certain signal amplification module, so as to make it easier for the signal amplification module to amplify the signal.

[0105] Obviously, through the technical solution provided in this embodiment, the accuracy and reliability of the detection result of the detection device when detecting the vibration signal can be further improved.

[0106] Correspondingly, an embodiment of the utility model further provides a vehicle-mounted vibration detection system, comprising a vibration signal detection device as disclosed above.

[0107] An on-vehicle vibration detection system provided by an embodiment of the utility model has the beneficial effects of the vibration signal detection device provided above.

[0108] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vibration signal detection device, characterized in that: include: Multiple vibration sensors; A constant current source connected to the multiple vibration sensors and used to power the multiple vibration sensors; A signal processing module connected to the constant current source and used to remove DC bias components and high-frequency noise signals; Connected to the signal processing module via a multi-channel selection switch, used to generate multiple signal amplification modules with different amplification gains; A controller connected to the multi-channel selection switch and used to determine the connection channels between the multi-channel selection switch and the plurality of signal amplification modules according to the signal strength of the output signal of the signal processing module; A data display module connected to the multiple signal amplification modules and used for displaying the amplified signals output by the multiple signal amplification modules.

2. A vibration signal detection device according to claim 1, characterized in that: The constant current source comprises: a voltage monitoring circuit, a first resistor, a second resistor and a triode; Wherein, the first end of the first resistor is respectively connected to the positive electrode of the first DC power supply and the input end of the target vibration sensor, the second end of the first resistor is respectively connected to the first end of the voltage monitoring circuit and the base of the transistor, the emitter of the transistor is respectively connected to the first end of the second resistor and the second end of the voltage monitoring circuit, and the collector of the transistor is connected to the output end of the target vibration sensor; the target vibration sensor is any one of a plurality of vibration sensors; Correspondingly, the negative electrode of the first DC power supply is grounded.

3. A vibration signal detection device according to claim 1, characterized in that: The signal processing module comprises: A plurality of debiasing circuits connected to the constant current source and used for respectively removing DC bias components in output signals of a plurality of vibration sensors; A low-pass filter circuit is connected to the multiple de-biasing circuits and is used to remove high-frequency noise signals in the output signals of the multiple de-biasing circuits.

4. A vibration signal detection device according to claim 3, characterized in that: The de-biasing circuit comprises: a first capacitor, a second capacitor, a third resistor, a fourth resistor and an operational amplifier; Wherein, the second end of the first capacitor is respectively connected to the first end of the second capacitor and the first end of the third resistor, the second end of the third resistor is respectively connected to the first input end and the output end of the operational amplifier, the second end of the second capacitor is respectively connected to the first end of the fourth resistor and the second input end of the operational amplifier, and the second end of the fourth resistor is grounded; Correspondingly, the first end of the first capacitor is connected to the constant current source.

5. The vibration signal detection device according to claim 1, characterized in that: The multi-channel selection switch comprises: a controllable switch and a relay unit composed of a plurality of relays connected in parallel; The output end of the relay unit is connected to the positive electrode of the second DC power supply, the input end of the relay unit is connected to the control end of the controllable switch, the first end of the controllable switch is grounded, and the second end of the controllable switch is connected to the controller; Correspondingly, the negative electrode of the second DC power supply is grounded, the output ends of the plurality of relays together constitute the output end of the relay unit, and the control ends of the plurality of relays together constitute the input end of the relay unit.

6. A vibration signal detection device according to claim 1, characterized in that: Multiple signal amplification modules include: A first amplifier circuit having an amplification gain of a first preset threshold; A second amplifier circuit with an amplification gain of a second preset threshold; wherein the first preset threshold and the second preset threshold are set according to the property characteristics of the equipment to be detected to which the multiple vibration sensors are connected.

7. A vibration signal detection device according to claim 1, characterized in that: The data display module includes: An analog-to-digital converter for performing analog-to-digital conversion on the amplified signals output by the plurality of signal amplification modules to obtain a target conversion signal; The controller is connected to the analog-to-digital converter and is used to collect the target conversion signal to obtain the target collection signal; A host computer connected to the controller and used to obtain the target acquisition signal and display the target acquisition signal.

8. A vibration signal detection device according to claim 7, characterized in that: The host computer comprises: A display screen for displaying the target acquisition signal; A button connected to the display screen, used to control the display screen to display the amplified signal output by the target signal amplifying module; wherein the target signal amplifying module is any one of the multiple signal amplifying modules.

9. A vibration signal detection device according to claim 7, characterized in that: The controller further comprises: Filter module used to filter out noise signals.

10. A vehicle-mounted vibration detection system, characterized in that: include: A vibration signal detection device as claimed in any one of claims 1 to 9.

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