Conditioning circuit for vibration measurement

Abstract

The utility model provides a conditioning circuit for vibration measurement, which belongs to the technical field of generator vibration measurement and comprises a type selection circuit, a first proportional amplification circuit, a second proportional amplification circuit, a filter circuit and a single chip microcomputer. The type selection circuit is connected with the first proportional amplification circuit, the first proportional amplification circuit is connected with the second proportional amplification circuit, the second proportional amplification circuit is connected with the filter circuit, the filter circuit is connected with the single chip microcomputer, and the single chip microcomputer is further connected with the second proportional amplification circuit. According to the utility model, the collection of vibration signals of the ICP source and the charge source can be automatically judged and switched.

Description

Technical Field

[0001] This utility model belongs to the field of generator vibration measurement technology, and in particular relates to a conditioning circuit for vibration measurement. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Generators are core equipment in power systems, and their safe and stable operation is crucial for ensuring power supply and maintaining the normal operation of social production and life. In power production, generators need to continuously and stably convert other forms of energy into electrical energy. Any fault or abnormality may lead to power outages, which can seriously affect industrial production and residents' lives.

[0004] During operation, generators inevitably vibrate due to various factors such as electromagnetic forces, mechanical imbalances, and fluid excitation. This vibration is a common phenomenon in generator operation, and different types and capacities of generators may face vibration problems. Excessive vibration can cause numerous hazards to the generator itself and the entire power system. For example, it can accelerate the wear of generator components, such as bearings and journals, reducing the service life of the equipment; it can also lead to damage to winding insulation, causing electrical faults such as short circuits; severe vibration may even loosen the generator foundation, affecting the stability of the entire unit and thus threatening the safe operation of the power system.

[0005] Currently, vibration measurement equipment on the market requires different interfaces to connect to ICP sources and charge sources. These interfaces are similar, and operators often cannot distinguish the correct one. Because the required amplification ratios differ, selecting the wrong interface makes it impossible to clearly determine from the collected data whether the connection is correct, leading to inaccurate experimental results and potentially damaging the equipment during prolonged operation. Utility Model Content

[0006] In view of the above-mentioned problems and defects in the existing technology, this utility model provides a conditioning circuit for vibration measurement, which realizes automatic judgment and switching of vibration signal acquisition from ICP source and charge source.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A conditioning circuit for vibration measurement includes: a type selection circuit, a first proportional amplifier circuit, a second proportional amplifier circuit, a filter circuit, and a microcontroller.

[0009] The type selection circuit is connected to the first proportional amplifier circuit, the first proportional amplifier circuit is connected to the second proportional amplifier circuit, the second proportional amplifier circuit is connected to the filter circuit, the filter circuit is connected to the microcontroller, and the microcontroller is also connected to the second proportional amplifier circuit.

[0010] In a further technical solution, the type selection circuit includes a relay, a first potentiometer, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fifth resistor, a sixth resistor, an eighth resistor, and a tenth resistor;

[0011] The first terminal of the signal source is connected to the inverting input terminal of the third operational amplifier, the first terminal of the first potentiometer, and the sliding terminal, respectively. The second terminal of the signal source is connected to the non-inverting input terminal of the second operational amplifier and is connected to the output terminal of the first operational amplifier through the fifth resistor. The constant current source is connected to the non-inverting input terminal of the first operational amplifier through the sixth resistor in series. The inverting input terminal and the output terminal of the second operational amplifier are both connected to the non-inverting input terminal of the first operational amplifier through the eighth resistor.

[0012] In a further technical solution, the type selection circuit also includes a transistor and a second potentiometer. The non-inverting input terminal of the third operational amplifier is connected to the sliding terminal of the second potentiometer. The first terminal of the second potentiometer is connected to the first pin of the third operational amplifier. The second terminal of the second potentiometer is connected to the eighth pin of the third operational amplifier. The output terminal of the third operational amplifier is connected to the base of the transistor through a tenth resistor. The collector of the transistor is connected to a relay. The fourth and fifth pins of the relay are connected to the first proportional amplifier circuit.

[0013] In a further technical solution, the constant current source is also connected in parallel with the fourth capacitor, the fifth capacitor, the sixth capacitor, and the seventh capacitor.

[0014] In a further technical solution, the first proportional amplifier circuit includes a third potentiometer, a fourth operational amplifier, a fifth operational amplifier, a second resistor, a third resistor, a ninth resistor, a second capacitor, and a third capacitor;

[0015] One end of the second resistor and the third capacitor connected in parallel is connected to the type selection circuit, and the other end is connected to the first inverting input terminal of the fourth operational amplifier. One end of the third resistor and the second capacitor connected in parallel is connected to the inverting input terminal of the fourth operational amplifier, and the other end is connected to the output terminal of the fourth operational amplifier. The output terminal of the fourth operational amplifier is connected to the inverting input terminal of the fifth operational amplifier through the ninth resistor. The third potentiometer is connected in parallel with the fifth operational amplifier, and the output terminal of the fifth operational amplifier outputs the first amplified signal.

[0016] In a further technical solution, the second proportional amplifier circuit is a multi-proportional amplifier circuit, used to automatically adjust the amplification ratio to perform secondary amplification of the first amplified signal; the multi-proportional amplifier circuit includes a multi-channel logic chip, and the input terminal of the multi-channel logic chip is connected to the output terminal of the first proportional amplifier circuit.

[0017] In a further technical solution, the multi-ratio amplifier circuit also includes a sixth operational amplifier, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, and an eleventh capacitor, and a second amplified signal input filter circuit for the output of the sixth operational amplifier;

[0018] The first output terminal of the multi-channel logic chip is connected to the non-inverting input terminal of the sixth operational amplifier. The second, third, and fourth output terminals are connected in series with the twenty-third, twenty-second, and twenty-first resistors, respectively, and then connected to the inverting input terminal and output terminal of the sixth operational amplifier through the eleventh capacitor.

[0019] In a further technical solution, the filter circuit includes a seventh operational amplifier, a twentieth resistor, a twenty-fifth resistor, a ninth capacitor, and a tenth capacitor;

[0020] The output of the second proportional amplifier circuit is connected in series with the ninth capacitor and then connected to the non-inverting input of the seventh operational amplifier through the tenth capacitor and the output of the seventh operational amplifier circuit through the twentieth resistor. The output of the seventh operational amplifier circuit is also connected to the microcontroller through the twenty-fifth resistor.

[0021] In a further technical solution, the third pin of the microcontroller is connected to the filter circuit, the fifth pin is connected to the tenth pin of the multi-channel logic chip U5, and the sixth pin is connected to the ninth pin of the multi-channel logic chip U5.

[0022] A further technical solution also includes a data acquisition card, which is connected to a filtering circuit.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This invention designs an automatic switching ICP source / charge source amplifier circuit, which can connect either an ICP source or a charge source to the same port and automatically detect and control the connection of different ratio amplifier circuits according to the different amplification ratios required by the signals from the two sources. This increases convenience and safety.

[0025] This invention employs a data acquisition card and a CPU to simultaneously acquire signals. The CPU adjusts the secondary amplification ratio based on the acquired signals to increase the accuracy of the experimental results.

[0026] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0028] Figure 1 This is a structural framework diagram of the conditioning circuit for vibration measurement described in this utility model.

[0029] Figure 2 This is a partial circuit diagram of the type selection circuit and the first proportional amplifier circuit in the conditioning circuit for vibration measurement described in this utility model.

[0030] Figure 3 This is a circuit diagram of the constant current source in the conditioning circuit used for vibration measurement according to the present invention.

[0031] Figure 4 This is a partial circuit diagram of the second proportional amplifier circuit and filter circuit in the conditioning circuit for vibration measurement described in this utility model.

[0032] Figure 5 This is a microcontroller circuit diagram of the conditioning circuit for vibration measurement described in this utility model. Detailed Implementation

[0033] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. It should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] To address the issue of erroneous data acquisition caused by the difference in amplification ratios required for ICP sources and charge sources, making it impossible to determine whether an incorrect interface has been connected, this invention discloses a conditioning circuit for vibration measurement.

[0036] The conditioning circuit for vibration measurement disclosed in this utility model has the following overall structural framework: Figure 1 As shown, it includes:

[0037] Type selection circuit, first proportional amplifier circuit, second proportional amplifier circuit, filter circuit, microcontroller and data acquisition card;

[0038] The type selection circuit is connected to the first proportional amplifier circuit, the first proportional amplifier circuit is connected to the second proportional amplifier circuit, the second proportional amplifier circuit is connected to the filter circuit, the filter circuit is connected to the data acquisition card, the filter circuit is also connected to the microcontroller, and the microcontroller is also connected to the second proportional amplifier circuit.

[0039] The circuit diagram of the type selection circuit and the first proportional amplifier circuit is shown below. Figure 2 As shown, the type selection circuit includes a relay JK1, a first potentiometer R11, a second potentiometer R16, a first operational amplifier U1A, a second operational amplifier U1B, a third operational amplifier U3, a constant current source U4, a diode M7, a TPS transistor TPS1, a transistor Q1, a first resistor R1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, an eighth resistor R8, a tenth resistor R10, a fourteenth resistor R14, a fifteenth resistor R15, and a first capacitor C1.

[0040] Specifically, the first terminal of the signal source is connected to the first terminal of the fourteenth resistor R14, the first inverting input terminal of the third operational amplifier U3, the first terminal of the first potentiometer R11, and the sliding terminal, respectively. The second terminal of the signal source is connected to the first terminal of the TPS transistor TPS1, the non-inverting input terminal of the second operational amplifier U1B, the first terminal of the fifth resistor R5, and the first terminal of the first capacitor C1, respectively. The second terminal of the TPS transistor TPS1 is grounded. The inverting input terminal and the output terminal of the second operational amplifier U1B are both connected to the first terminal of the eighth resistor R8. The second terminal of the eighth resistor R8 is connected to the first terminal of the sixth resistor R6 and the non-inverting input terminal of the first operational amplifier U1A, respectively. The second terminal of the sixth resistor R6 is connected to the constant current source U4. The inverting input terminal of the first operational amplifier U1A is connected to the first terminal of the fourth resistor R4 and the first terminal of the first resistor R1, respectively. The second terminal of the fourth resistor R4 is grounded. The second terminal of the first resistor R1 is connected to the output terminal of the first operational amplifier U1A and the second terminal of the fifth resistor R5, respectively. The second terminal of the fourteenth resistor R14 is grounded. The first non-inverting input terminal of the third operational amplifier U3 is connected to the fifteenth resistor R15. The first terminal is connected, the second terminal of the fifteenth resistor R15 is grounded, the second inverting input terminal of the third operational amplifier U3 is connected to the negative power supply VEE, the second non-inverting input terminal of the third operational amplifier U3 is connected to the positive power supply VCC and the sliding terminal of the second potentiometer R16, the first terminal of the second potentiometer R16 is connected to the first pin of the third operational amplifier U3, the second terminal of the second potentiometer R16 is connected to the eighth pin of the third operational amplifier U3, the first and eighth pins of the third operational amplifier U3 are the bias balance terminals, also known as the zero adjustment terminals, used to balance and adjust the bias voltage in the circuit, the output terminal of the third operational amplifier U3 is connected to the second terminal of the first potentiometer R11 and the first terminal of the tenth resistor R10, the second terminal of the tenth resistor R10 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the first pin of the relay JK1, the second pin of the relay JK1 is connected to the power supply, the third pin of the relay JK1 is connected to the second terminal of the first capacitor C1, and the fourth and fifth pins of the relay JK1 are connected to the first proportional amplifier circuit.

[0041] Furthermore, such as Figure 3 As shown, the constant current source U4 also includes a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7.

[0042] Specifically, the input terminal Vin of the constant current source U4 is connected to the first terminal of the fourth capacitor C4, the first terminal of the fifth capacitor C5, and the positive power supply VCC, respectively. The output terminal Vout of the constant current source U4 is connected to the first terminal of the sixth capacitor C6, the first terminal of the seventh capacitor C7, and the constant current output terminal Vref, respectively. The ground terminal GND of the constant current source U4 is connected to and grounded to the second terminal of the fourth capacitor C4, the second terminal of the fifth capacitor C5, the second terminal of the sixth capacitor C6, and the second terminal of the seventh capacitor C7, respectively.

[0043] The output current of a constant current source remains stable within a certain range and does not change with load variations. When an ICP source is connected, the constant current source forms a loop with it. Simultaneously, the type selection circuit detects this change and controls a relay to connect the ICP source to a small-ratio amplifier circuit. The amplified signal is then filtered and acquired by the data acquisition card and CPU. The CPU adjusts the amplification ratio based on the values ​​to make the test results more accurate. When a charge source is connected, the constant current source cannot form a loop, the type selection circuit does not activate, and the charge source defaults to a large-ratio amplifier circuit. The amplified signal is then filtered and enters the data acquisition card and CPU. The CPU adjusts the amplification ratio based on the values ​​to make the test results more accurate.

[0044] Furthermore, the first proportional amplifier circuit includes a third potentiometer R7, a fourth operational amplifier U2A, a fifth operational amplifier U2B, a second resistor R2, a third resistor R3, a ninth resistor R9, a twelfth resistor R12, a second capacitor C2, and a third capacitor C3.

[0045] Specifically, the first terminal of the second resistor R2 and the first terminal of the third capacitor C3 are both connected to the fourth pin of the relay JK1. The second terminal of the second resistor R2 and the second terminal of the third capacitor C3 are both connected to the first terminal of the third resistor R3, the first terminal of the second capacitor C2, and the first inverting input terminal of the fourth operational amplifier U2A. The first inverting input terminal of the fourth operational amplifier U2A is also connected to the fifth pin of the relay JK1. The second inverting input terminal of the fourth operational amplifier U2A is connected to the negative power supply, and the second non-inverting input terminal of the fourth operational amplifier U2A is connected to the positive power supply. The output terminal of the fourth operational amplifier U2A is connected to the second terminal of the third resistor R3, the second terminal of the second capacitor C2, and the first terminal of the ninth resistor R9, respectively. The second terminal of the ninth resistor R9 is connected to the inverting input terminal of the fifth operational amplifier U2B and the first terminal of the third potentiometer R7. The non-inverting input terminal of the fifth operational amplifier U2B is grounded. The output terminal of the fifth operational amplifier U2B is connected to the second terminal and the sliding terminal of the third potentiometer R7. The output terminal of the fifth operational amplifier U2B outputs the first amplified signal OUT1.

[0046] The type selection circuit automatically determines and switches the vibration signal acquisition circuit based on the type of signal source. Located between the signal source and the amplification circuit, the type selection circuit acquires signals from ICP sources and charge sources. When acquiring an ICP source, the signal from the closed loop formed by the ICP source and the constant current source controls the relay in the type selection circuit to close, thus entering the small-ratio amplification circuit in the first proportional amplification circuit. However, when acquiring a charge source, the charge source and the constant current source do not form a closed loop, the relay in the type selection circuit does not activate, and the charge directly enters the large-ratio amplification circuit in the first proportional amplification circuit.

[0047] The small-ratio amplifier circuit is used to amplify the ICP source signal.

[0048] The high-ratio amplifier circuit is used to amplify the charge source signal.

[0049] The circuit diagram of the second proportional amplifier circuit and the filter circuit is as follows: Figure 4 As shown.

[0050] The second proportional amplifier circuit is a multi-proportional amplifier circuit, used to automatically adjust the amplification ratio to perform secondary amplification on the first amplified signal. The multi-proportional amplifier circuit includes a multi-channel logic chip U5, a sixth operational amplifier U7B, a thirteenth resistor R13, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, an eighth capacitor C8, an eleventh capacitor C11, and an input filter circuit for the output second amplified signal.

[0051] Specifically, the first amplified signal OUT1 is connected to the first terminal of the thirteenth resistor R13, the first terminal of the seventeenth resistor R17, the first terminal of the eighteenth resistor R18, and the first terminal of the nineteenth resistor R19. The second terminal of the thirteenth resistor R13 is grounded. The second terminal of the seventeenth resistor R17 is connected to the fifteenth pin X0 of the multi-channel logic chip U5. The second terminal of the eighteenth resistor R18 is connected to the fourteenth pin X1 of the multi-channel logic chip U5. The second terminal of the nineteenth resistor R19 is connected to the thirteenth pin X2 of the multi-channel logic chip U5. The sixteenth pin X of the multi-channel logic chip U5 is connected to the first terminal of the twenty-first resistor R21, the first terminal of the twenty-second resistor R22, the first terminal of the twenty-third resistor R23, and the eleventh... The first terminal of capacitor C11 is connected to the following terminals: the second terminal of the twenty-first resistor R21 is connected to the fourth pin Y2 of the multi-channel logic chip U5; the second terminal of the twenty-second resistor R22 is connected to the third pin Y1 of the multi-channel logic chip U5; the second terminal of the twenty-third resistor R23 is connected to the second pin Y0 of the multi-channel logic chip U5; the first pin Y of the multi-channel logic chip U5 is connected to the first terminal of the eighth capacitor C8 and the non-inverting input terminal of the sixth operational amplifier U7B; the second terminal of the eighth capacitor C8 is grounded; the output terminal of the sixth operational amplifier U7B is connected to the second terminal of the eleventh capacitor C11 and the inverting input terminal of the sixth operational amplifier U7B; and the output terminal of the sixth operational amplifier U7B outputs the second amplified signal.

[0052] The filtering circuit includes a seventh operational amplifier U7A, a twentieth resistor R20, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a ninth capacitor C9, and a tenth capacitor C10. The final conditioned signal output by the filtering circuit is acquired by the acquisition card.

[0053] Specifically, the output of the sixth operational amplifier U7B is connected to the first terminal of the ninth capacitor C9. The second terminal of the ninth capacitor C9 is connected to the first terminal of the tenth capacitor C10 and the first terminal of the twentieth resistor R20. The second terminal of the tenth capacitor C10 is connected to the first terminal of the twenty-fourth resistor R24 ​​and the first non-inverting input terminal of the seventh operational amplifier U7A. The second terminal of the twenty-fourth resistor R24 ​​is grounded. The second terminal of the twentieth resistor R20 is connected to the output terminal of the seventh operational amplifier U7A, the first inverting input terminal, the first terminal of the twenty-fifth resistor R25, and the data acquisition card. The second non-inverting input terminal of the seventh operational amplifier U7A is connected to the positive power supply, and the second inverting input terminal of the seventh operational amplifier U7A is connected to the negative power supply. The second terminal of the twenty-fifth resistor R25 is connected to the microcontroller CPU U6 and the first terminal of the twenty-sixth resistor R26. The second terminal of the twenty-sixth resistor R26 is grounded.

[0054] The microcontroller CPU, such as Figure 5 As shown, the first pin of the microcontroller U6 is connected to the positive power supply, the second pin is connected to the analog ground, the third pin AD1 is connected to the filter circuit, the fifth pin output A is connected to the tenth pin of the multi-channel logic chip U5, the sixth pin output B is connected to the ninth pin of the multi-channel logic chip U5, and the eighth pin is grounded.

[0055] The vibration signal acquisition circuit for ICP source and charge source proposed in this invention can automatically identify and switch between ICP source and charge source, effectively improving the accuracy and safety of vibration signal acquisition.

[0056] The conditioning proposed in this invention can automatically detect and control the connection of different ratio amplifier circuits according to the different amplification ratios required by the signals from the same ICP source or charge source connected to the same port. The working principle is as follows:

[0057] When terminal J1 is connected to the ICP source, the constant current output Vref generated by the constant current source U4 is connected to the ICP source through the first operational amplifier U1A and the second operational amplifier U1B to form a loop. The voltage generated at the front end of the fourteenth resistor R14 is amplified by the third operational amplifier U3 and then controls the third and fifth pins of the relay JK1 to close. The ICP signal is input through the third pin and output through the fifth pin of the relay JK1. The output signal is amplified by the third resistor R3 of the fourth operational amplifier U2A and outputs the first amplified signal OUT1 through the fifth operational amplifier U2B.

[0058] When terminal J1 is connected to the charge source, the constant current output Vref generated by the constant current source U4 cannot form a circuit with the charge source after passing through the first operational amplifier U1A and the second operational amplifier U1B. There is no voltage at the front end of the fourteenth resistor R14, and the relay does not operate. By default, the third and fourth pins of the relay are closed. The charge signal is input through the third pin and output through the fourth pin of the relay JK1. The output signal is amplified by the second resistor R2 and the third resistor R3 of the fourth operational amplifier U2A, and the first amplified signal OUT1 is output through the fifth operational amplifier U2B.

[0059] The first amplified signal OUT1 is amplified by the seventeenth resistor R17 and then enters through the fifteenth pin X0 of the logic chip U5 and outputs through the sixteenth pin X. After being amplified by the twenty-third resistor R23, it enters through the second pin Y0 of the logic chip U5 and outputs through the first pin Y. It is then acquired by the third pin AD1 of the microcontroller CPU through the sixth operational amplifier U7B and the seventh operational amplifier U7A. The CPU analyzes the signal magnitude and controls the channels of the logic chip U5 to amplify it at different ratios through the fifth pin A and the sixth pin B. The resulting signal then enters the acquisition card again through the sixth operational amplifier U7B and the seventh operational amplifier U7A.

[0060] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. Conditioning circuit for vibration measurements, characterized in that, The application relates to a type selection circuit, a first proportional amplification circuit, a second proportional amplification circuit, a filter circuit and a single-chip microcomputer. The type selection circuit is connected with the first proportional amplification circuit, the first proportional amplification circuit is connected with the second proportional amplification circuit, the second proportional amplification circuit is connected with the filter circuit, the filter circuit is connected with the single-chip microcomputer, and the single-chip microcomputer is further connected with the second proportional amplification circuit. The type selection circuit comprises a relay, a first potentiometer, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fifth resistor, a sixth resistor and an eighth resistor.

2. Conditioning circuit for vibration measurements as claimed in claim 1, characterized in that, A signal source first end is connected with a third operational amplifier inverting input end, a first potentiometer first end and a sliding end, a signal source second end is connected with a second operational amplifier non-inverting input end and is connected with a first operational amplifier output end through a fifth resistor, a constant current source is connected with a first operational amplifier non-inverting input end through a sixth resistor, and a second operational amplifier inverting input end and output end are both connected with a first operational amplifier non-inverting input end through an eighth resistor. The type selection circuit further comprises a triode and a second potentiometer, the third operational amplifier non-inverting input end is connected with the second potentiometer sliding end, the second potentiometer first end is connected with the third operational amplifier first pin, the second potentiometer second end is connected with the third operational amplifier eighth pin, the third operational amplifier output end is connected with the triode base through a tenth resistor, the triode collector is connected with the relay, and the relay fourth pin and the relay fifth pin are connected with the first proportional amplification circuit.

3. A conditioning circuit for vibration measurement as claimed in claim 2, characterized in that The constant current source is further connected with a fourth capacitor, a fifth capacitor, a sixth capacitor and a seventh capacitor in parallel.

4. A conditioning circuit for vibration measurement as claimed in claim 2, characterized in that, The first proportional amplification circuit comprises a third potentiometer, a fourth operational amplifier, a fifth operational amplifier, a second resistor, a third resistor, a ninth resistor, a second capacitor and a third capacitor.

5. A conditioning circuit for vibration measurement as claimed in claim 1, characterized in that, The second resistor and the third capacitor are connected with the type selection circuit at one end and are connected with the fourth operational amplifier first inverting input end at the other end, the third resistor and the second capacitor are connected with the fourth operational amplifier inverting input end at one end and are connected with the fourth operational amplifier output end at the other end, the fourth operational amplifier output end is connected with the fifth operational amplifier inverting input end through the ninth resistor, the third potentiometer is connected with the fifth operational amplifier in parallel, and the fifth operational amplifier output end outputs a first amplification signal. The second proportional amplification circuit is a multi-proportional amplification circuit, which is used for automatically adjusting an amplification proportion to perform secondary amplification on the first amplification signal; and the multi-proportional amplification circuit comprises a multi-channel logic chip, and an input end of the multi-channel logic chip is connected with an output end of the first proportional amplification circuit.

6. A conditioning circuit for vibration measurement as claimed in claim 1, characterized in that, The multi-proportional amplification circuit further comprises a sixth operational amplifier, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor and an eleventh capacitor, and a second amplification signal output by the sixth operational amplifier is input into the filter circuit.

7. A conditioning circuit for vibration measurement as claimed in claim 6, characterised in that, ​ The first output end of the multi-channel logic chip is connected with the non-inverting input end of the sixth operational amplifier, and the second, third and fourth output ends are respectively connected with the inverting input end and the output end of the sixth operational amplifier through the twenty-third resistor, the twenty-second resistor and the twenty-first resistor in series and the eleventh capacitor.

8. A conditioning circuit for vibration measurement as defined in claim 1, characterized in that The filter circuit comprises a seventh operational amplifier, a twentieth resistor, a twenty-fifth resistor, a ninth capacitor and a tenth capacitor. The output end of the second proportional amplification circuit is connected with the non-inverting input end of the seventh operational amplifier through the ninth capacitor and the tenth capacitor, connected with the output end of the seventh operational amplifier through the twentieth resistor, and further connected with the single-chip microcomputer through the twenty-fifth resistor.

9. A conditioning circuit for vibration measurement as claimed in claim 1, wherein, The third pin of the single-chip microcomputer is connected with the filter circuit, the fifth pin is connected with the tenth pin of the multi-channel logic chip U5, and the sixth pin is connected with the ninth pin of the multi-channel logic chip U5.

10. A conditioning circuit for vibration measurement as defined in claim 1, characterized in that, The filter circuit is connected with a collection card.

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