CN206847770U - Casing vibration intelligent digital monitoring table - Google Patents

Abstract

The utility model provides a kind of casing vibration intelligent digital monitoring table, circuit is pre-processed including analog signal, analog to digital conversion circuit, CPU and detection signal output circuit and alarm signal output circuit, the input of the analog signal pretreatment circuit is connected with variable connector, the variable connector is provided with device senses signal incoming end and environmentally sensitive signal incoming end, the output of the analog signal pretreatment circuit accesses the CPU by analog-digital conversion circuit as described, the corresponding output of the CPU is respectively connected to the input of the detection signal output circuit and alarm signal output circuit.This monitoring table is simple in construction, can the additional vibratory brought of environment-identification factor, thus avoid or reduce the wrong report caused by ambient vibration.

Description

Chassis Vibration Intelligent Digital Monitoring Meter

technical field

The utility model relates to a simple and efficient casing vibration intelligent digital monitoring meter, which belongs to the field of mechanical vibration monitoring and protection.

Background technique

Rotating machinery is widely used in almost all industrial sectors such as electric power, petrochemical, metallurgy, manufacturing, aviation, etc. It is a key equipment in production and has a great impact on safety production. In practical applications, due to the existence of many unavoidable factors such as wear and tear, various failures of rotating machinery often occur, resulting in the reduction or loss of its intended function, and may even cause serious accidents, resulting in huge economic losses and even casualties. serious social impact.

Vibration is the main cause of failures in rotating machinery, and different types of failures will be manifested in vibration signals. Therefore, vibration monitoring of rotating machinery can effectively reduce the occurrence of the above situation and ensure the safe and efficient operation of machinery and equipment. By monitoring the vibration signal of the rotating machinery in real time, and analyzing and processing it, it is possible to grasp information such as the operating status and development trend of the equipment at any time. This information helps relevant personnel to find problems before serious failures or serious accidents occur in rotating machinery equipment, and to maintain and repair them in advance, so as to effectively avoid major accidents.

Existing devices for vibration detection of rotating machinery mainly use data processing chips for data processing. After pre-processing analog signals such as filtering and amplification, the analog quantities used by sensors are sent to the central processing unit for processing through analog-to-digital conversion, and generate Corresponding test result data and store, display, and transmit relevant data, and when necessary, alarm and control the equipment in an appropriate manner such as shutdown by alarm signal or corresponding control command. The defect of this detection device is that it does not consider background factors. The impact on the signal collected by the sensor cannot identify the excessive vibration caused by the operation of adjacent large stamping machines and other environmental factors, nor can it identify the excessive vibration caused by the normal startup process of the equipment itself, so there are false alarms. Especially in some occasions, strong measures such as shutdown should be taken because the vibration exceeds the limit, and related false alarms will lead to more serious consequences and losses.

Utility model content

In order to overcome the above-mentioned defects of the prior art, the utility model provides an intelligent digital monitoring meter for casing vibration. The monitoring meter has a simple structure and can identify additional vibration caused by environmental factors.

The technical scheme of the utility model to achieve the above object is: a casing vibration intelligent digital monitoring meter, including an analog signal preprocessing circuit, an analog-to-digital conversion circuit, a central processing unit, a detection signal output circuit and an alarm signal output circuit. The input end of the signal preprocessing circuit is connected to a multi-way switch, and the multi-way switch is provided with an equipment sensing signal input end and an environment sensing signal input end, and the output of the analog signal preprocessing circuit passes through the modulus The conversion circuit is connected to the central processing unit, and the corresponding outputs of the central processing unit are respectively connected to the input terminals of the detection signal output circuit and the alarm signal output circuit.

Connect the equipment sensor output end for monitoring equipment vibration and the environmental sensor output end for monitoring environmental vibration to the corresponding input terminals of the multi-way switch, and the multi-way switch is connected in time under the control of the central processing unit Equipment sensing signal (can be in the form of analog current signal) and environment sensing signal (can be in the form of analog current signal), the analog signal connected through the multi-way switch is filtered and amplified by the pre-processing circuit, and then passed through the analog-to-digital conversion circuit It is converted into a suitable digital quantity and connected to the central processing unit. The central processing unit performs data processing and analysis according to the preset program, and can coordinate and control the work of other parts. The data processing and analysis can be based on the characteristics of the analog signal obtained by the sensor and the sensor ( Usually the corresponding relationship with the vibration intensity is non-linear), calculate the vibration data of the equipment after deducting the influence of environmental vibration, form the data amount or vibration detection data that is linearly corresponding to the equipment vibration index, and form a linear Usually, the detection signal can use a constant current signal to better meet the requirements of the vibration detection signal in the industrial field. The utility model eliminates the influence of environmental vibration on the detection results, can better reflect the vibration status of the equipment itself, and will not cause false alarms due to environmental factors such as the work of adjacent equipment, thereby better adapting to industrial field conditions. In addition, the multi-way switch adopts a time-sharing method, which does not need to set up a special preprocessing circuit for the environmental sensing signal, and can make full use of the processing capacity of the central processing unit, which is conducive to simplifying the structure and reducing the production cost. The utility model is suitable for vibration monitoring of various rotating machines such as steam turbines, compressors, motors, pumps, fans, blowers, centrifuges and generators, and other machines.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of the present utility model.

detailed description

Referring to Fig. 1, the utility model is an intelligent digital monitoring table for casing vibration, comprising an analog signal preprocessing circuit, an analog-to-digital conversion circuit, a central processing unit, a detection signal output circuit and an alarm signal output circuit, and the analog signal preprocessing The input end of the circuit is connected with a multi-way switch, and the multi-way switch is provided with an equipment sensing signal input end and an environment sensing signal input end. The input terminal is respectively connected to the output of the equipment sensor and the output of the environment sensor. The equipment sensor is a sensor used to collect equipment-related signals. It can usually be installed on the monitored equipment, or its vibration sensing element is installed on the equipment. The environmental sensor is installed in an environment other than the monitored equipment, but not on the monitored equipment. The location of the environmental sensor is selected according to the environmental vibration characteristics. For example, it can be the ground with a certain distance from the monitored equipment, or as the main environment. On other equipment of the vibration source, the output of the analog signal preprocessing circuit is connected to the central processing unit through the analog-to-digital conversion circuit, and the corresponding output of the central processing unit is respectively connected to the detection signal output circuit and alarm The input terminal of the signal output circuit. The sensing signal output by the sensor is usually an analog electrical signal, such as current, and usually corresponds to a specific vibration index nonlinearly. The weak or nonlinear electrical signal output by the sensor is filtered and amplified through a series of circuits, and converted by the central processing unit into Linear digital quantities generally need to measure various non-electric physical quantities in industry, such as temperature, pressure, speed, angle and other physical quantities, which can be realized by the utility model after being collected by sensors or related information acquisition devices. The number of equipment sensors used to obtain equipment sensing signals can be one or more. When multiple equipment sensors are used, the setting and distribution of multiple equipment sensors can be determined according to equipment vibration characteristics and sensor characteristics. Multiple equipment can be used The average value and median value of the sensor signals involved in the sensor are used as the device sensor signal, and the sensor signal of each device sensor can also be calculated and applied independently, such as taking corresponding measures for abnormal conditions obtained by any device sensor , individual abnormal data can be eliminated based on multiple sets of data from multiple equipment sensors within a certain period of time, so as to eliminate the interference of accidental factors. The number of the environmental sensors can be one or more, preferably multiple, in order to adopt an appropriate distribution method to better identify the influence of environmental vibration on the device sensing signal, sensor position, mutual distance and vibration characteristics etc. can be used to distinguish and identify different vibration sources, and can be reasonably arranged in combination with specific use occasions. For example, when only one or a few equipment in the environment may cause environmental vibration with substantial The sensors are arranged on this/these devices or near the devices. The vibration transmission characteristics of the environment and the attenuation of the vibration during the transmission process should be considered in the calculation. The specific influence of the distance factor on the relevant sensor signals can be obtained based on the measured data or through theoretical calculations. . Various specific calculation methods involved in the data processing of equipment sensor signals and environmental sensing signals can be based on the existing technology, and the impact of the vibration of the equipment itself on the sensing signals/operation results can be analyzed according to the position distribution of the environmental sensors and the positional relationship with the equipment sensors. The contribution of environmental vibration to the sensing signal/calculation result can also determine the vibration of different sources according to the vibration characteristics, thereby more accurately distinguishing and identifying the environmental vibration.

The analog signal preprocessing circuit usually needs to filter and amplify to eliminate noise and amplify the useful signal to an appropriate level suitable for subsequent processing. The analog signal preprocessing circuit can include a band-pass filter circuit and an amplifying circuit, and can also be based on In the prior art and the actual need to set up circuits with other functions, the output of the multi-way switch is connected to the input end of the band-pass filter circuit, and the output of the band-pass filter circuit is connected to the input end of the amplifying circuit, so The output of the amplifying circuit is connected to the input end of the analog-to-digital conversion circuit, thereby realizing that the output of the analog signal preprocessing circuit is connected to the central processing unit through the analog-to-digital conversion circuit, and the amplifying circuit preferably adopts program-controlled amplification circuit.

Preferably, the clock signal output of the central processing unit is connected to the clock signal input end of the band-pass filter, so as to realize the cooperative work of various parts.

The detection signal output circuit may include a digital-to-analog conversion circuit and a constant current conversion circuit, the input end of the digital-to-analog conversion circuit is connected to the corresponding output of the central processing unit, and the output of the digital-to-analog conversion circuit is connected to the constant current conversion circuit. The input terminal of the current conversion circuit, so that the output of the constant current conversion circuit can generally constitute the output of the detection signal output circuit.

Preferably, the output of the digital-to-analog conversion circuit is connected to the input terminal of the photocoupler to realize output isolation, and the output of the photocoupler is connected to the input terminal of the constant current conversion circuit, thereby realizing the digital The output of the analog conversion circuit is connected to the input end of the constant current conversion circuit. The output of the digital-to-analog conversion circuit is divided into two channels after being isolated by the optocoupler, and enters the corresponding constant current conversion circuit to be converted into two 4-20mA active outputs. When one output terminal fails, the other output terminal can be used , to improve the reliability of the output.

The number of the constant current conversion circuits can be at least two, including a first constant current conversion circuit and a second constant current conversion circuit. Correspondingly, the output of the digital-to-analog conversion circuit can be divided into at least two circuits, and The constant current conversion circuits are in one-to-one correspondence, and the outputs of the digital-to-analog conversion circuits are respectively connected to the corresponding input terminals of the constant current conversion circuits. This forms the analog output redundancy, and when one output fails, the other output can also be used.

The output terminal of the constant current conversion circuit can be provided with a constant current monitoring signal output terminal and connected to a control actuator, through which the constant current monitoring signal output terminal can be connected to devices that need to use these signals. The control executor can use an electronically controlled switch device, for example, preferably a relay and/or a thyristor, so as to control the working state of related equipment according to the vibration monitoring results, for example, turn on or off the controlled circuit, and then Turn on or off the power or control circuits of related equipment.

When the number of the constant current conversion circuits is at least two, the number of the control actuators may also be at least two, corresponding to the constant current conversion circuits one by one, including a first control actuator and a second control actuator. An actuator, the output of the constant current conversion circuit is connected to the corresponding control input of the control actuator. This creates control redundancy, whereby one actuator can be used if another actuator is not available due to a fault.

The central processing unit may be connected with a bypass alarm input circuit for inputting a bypass alarm command, an alarm multiplication input circuit for inputting an alarm multiplication command, and a bypass alarm output circuit for outputting a bypass alarm signal. The output of the road alarm output circuit is connected to the control terminal of the bypass alarm device, and the bypass alarm device can be any one or more of alarm buzzer, alarm horn, alarm lamp, display screen and alarm voice player , through on-site manual input or remote input of bypass alarm command or alarm multiplication command, in the case of input bypass alarm command, the central processing unit will not send an alarm signal to the alarm signal output circuit when an alarm is required, and it will not be controlled The device or this device performs alarm control, but sends an alarm signal to the bypass alarm output circuit, and the bypass alarm output circuit connects the alarm signal to the corresponding bypass alarm device. This method can not only realize no alarm in special cases And do not carry out alarm control, but also can remind managers or operators through the bypass alarm device, so as to avoid false alarms in the case of substantive problems.

The central processing unit can also be connected with a display device, a power supply circuit, a digital monitoring signal output circuit, a key input circuit and a communication circuit. The connection mode of the above-mentioned related circuits on the central processing unit can be based on the structure of the specific chip according to the prior art. and the working mode, the communication circuit can adopt various suitable forms of wired communication interface circuits and/or various suitable forms of wireless transmitting and receiving circuits, so as to realize communication with the host computer, computer network and other connected devices. communication.

The display device can be a display screen embedded in the housing, or an independent display, and the display element can be a liquid crystal display, or an organic light emitting diode (OLED) display or any other suitable technology.

The output of the device sensor can also be connected to the original signal buffer output circuit to meet the requirements of other devices using the original signal collected by the sensor.

The utility model can be used for vibration monitoring or other detections according to the type of sensor and the corresponding calculation method. The information collected by the sensor can calculate the required vibration indicators, which can be collectively referred to as vibration sensors.

The preferred and optional technical means disclosed in the utility model can be combined arbitrarily to form several different technical solutions, unless otherwise specified and one preferred or optional technical means is further limited by another technical means.

Claims (12)

1. A casing vibration intelligent digital monitoring table, comprising an analog signal preprocessing circuit, an analog-to-digital conversion circuit, a central processing unit, a detection signal output circuit and an alarm signal output circuit, is characterized in that the input of the analog signal preprocessing circuit The multi-way switch is connected to the multi-way switch, and the multi-way switch is provided with an equipment sensing signal input end and an environment sensing signal input end, and the output of the analog signal preprocessing circuit is connected to the A central processing unit, the corresponding outputs of the central processing unit are respectively connected to the input terminals of the detection signal output circuit and the alarm signal output circuit. 2. The monitoring meter as claimed in claim 1, wherein said analog signal preprocessing circuit comprises a band-pass filter circuit and an amplifying circuit, the output of said multi-way switch is connected to the input end of said band-pass filter circuit, The output of the band-pass filter circuit is connected to the input terminal of the amplifying circuit, and the output of the amplifying circuit is connected to the input terminal of the analog-to-digital conversion circuit, thereby realizing that the output of the analog signal preprocessing circuit passes through the The analog-to-digital conversion circuit described above is connected to the central processing unit. 3. The monitoring watch as claimed in claim 1, wherein the detection signal output circuit comprises a digital-to-analog conversion circuit and a constant current conversion circuit, and the input end of the digital-to-analog conversion circuit is connected to the corresponding output of the central processing unit , the output of the digital-to-analog conversion circuit is connected to the input terminal of the constant current conversion circuit. 4. The monitoring meter according to claim 3, wherein the output of the digital-to-analog conversion circuit is connected to the input of the photocoupler, and the output of the photocoupler is connected to the input of the constant current conversion circuit , so that the output of the digital-to-analog conversion circuit is connected to the input terminal of the constant current conversion circuit. 5. The watch as claimed in claim 4, characterized in that the quantity of the constant current conversion circuit is at least two, comprising a first constant current conversion circuit and a second constant current conversion circuit, the digital-to-analog conversion circuit The output is divided into at least two paths, corresponding to the constant current conversion circuits one by one, and the outputs of the digital-to-analog conversion circuits are respectively connected to the corresponding input terminals of the constant current conversion circuits. 6. The monitoring meter according to claim 5, characterized in that the output terminal of the constant current conversion circuit is provided with a constant current monitoring signal output terminal and connected with a control actuator, and the control actuator adopts an electric control switch device. 7. The monitoring meter according to claim 6, characterized in that when the number of the constant current conversion circuits is at least two, the number of the control actuators is also at least two, and the number of the constant current conversion circuits is at least two. One-to-one correspondence, including a first control executor and a second control executor, the output of the constant current conversion circuit is connected to the corresponding control input of the control executor. 8. The watch as claimed in claim 1, wherein the central processing unit is connected with a bypass alarm input circuit for inputting a bypass alarm instruction, an alarm multiplication input circuit for inputting an alarm multiplication instruction, and an output circuit for outputting The bypass alarm output circuit of the bypass alarm signal, the output of the bypass alarm output circuit is connected to the control terminal of the bypass alarm device, and the bypass alarm device can be an alarm buzzer, an alarm horn, an alarm lamp, a display Any one or more of screen and alarm voice player. 9. The monitoring meter according to claim 1, characterized in that the central processing unit is also connected with a display device, a power supply circuit, a digital monitoring signal output circuit, a key input circuit and a communication circuit. 10. The monitoring meter according to claim 1, characterized in that the output of the device sensor is also connected to the original signal buffer output circuit. 11. The watch as claimed in claim 2, characterized in that said amplifying circuit adopts a program-controlled amplifying circuit. 12. The monitoring meter according to claim 6, characterized in that the control actuator adopts a relay and/or a thyristor.