JPS6264917A - Simple vibration monitor apparatus - Google Patents

Abstract

PURPOSE:To make it possible to always simply discriminate the state of a machine, by integrally constituting a detection circuit, an amplifying circuit, a level discriminating circuit and a display circuit along with a power source and always detecting the vibration of the machine during operation to display the level thereof. CONSTITUTION:The vibration of a machine is converted to an electric signal using a vibration detecting circuit 1. Next, The electric signal proportional to the vibration level is amplified by an amplifying circuit 2 to be inputted to the level discriminating circuit 3 of the next stage. A plurality of reference levels are stepwise preset to the level discriminating circuit 3 and the vibration level inputted to the level discriminating circuit 3 is compared with said reference levels to discriminate which levels of normality, caution and danger the inputted vibration level belongs to. Subsequently, the discrimination result is inputted to a display circuit 4 and the specific light emitter corresponding to the vibration level is lighted by the output signal of the level discriminating circuit 3. By this method, the state of the machine can be always discriminated in a markedly simple manner.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention detects an image of a mechanical structure in operation, such as an electric motor, as an electrical signal, and detects the image obtained through the detected quantity of electricity. This invention relates to a device that detects abnormalities in structures based on level.

[Prior art and its problems]

Vibration that occurs during the operation of mechanical structures such as electric motors accurately represents the condition of moving parts, and it responds sensitively to both gradual aging and sudden abnormalities, so it is important for the operation of machinery. considered essential for surveillance.

Generally, this mechanical vibration is measured by electrically detecting the speed and acceleration of the vibration, and inputting the detected amount of electricity into a vibration meter that indicates the magnitude of the vibration. In large-scale plants in industrial fields such as electric power, steel, and chemicals that use many rotating machines, the condition of machines through vibration is actively monitored in order to improve plant availability and effectively carry out maintenance and repairs. Normally, lifeguards patrol regularly and measure vibrations. However, since the indicated values of the No. 11 vibration meters are directly read one by one, there are many machines to be inspected, and there are therefore many parts to be measured, which requires labor and time.

(2) Because the vibration detector is installed and measured each time,
The vibration measurement position and the method of installing the vibration detector are not necessarily constant, and therefore, there are individual differences in determining the state of the machine.

(3) Most of the machines to be measured are rotating machines, and the installation of the detector and the measurement of photography are done while the machine is operating.
It may be dangerous.

There were other problems. In order to solve such problems,
In recent years, there has been a trend, especially for machines with high demands, to fix only the imaging detection part to the machine number and centrally monitor the output from the detection part from a distance. The IT cost of installing the system is high, and installation work may not be possible in existing plants.

[Purpose of the invention]

This invention eliminates the above-mentioned problems, and in order to improve machine availability and avoid sudden accidents, the present invention constantly detects machine vibration during operation and displays its level, so that the machine status can be constantly and practically monitored. It is an object of the present invention to provide a vibration monitoring device that can easily discriminate from various viewpoints.

[Key points of the invention]

This invention provides a vibration monitoring device that includes a circuit that detects vibrations of a structure as an electrical signal, a circuit that amplifies the detected electrical signal, and a level of imaging detected and amplified as the electrical signal. a level discriminating circuit for classifying according to a plurality of reference levels set according to the above, a circuit for displaying the reference level to which the divided imaging levels belong, the above-mentioned detection circuit, amplifier circuit, level discriminating circuit and display-1
In addition to integrating the power supply that operates the circuit and making it more compact and making it easier to fix it to a large number of measurement points, the number of reference levels set in stages can be adjusted based on the condition of the machine from a practical point of view. necessary to determine.

The above objective is achieved by limiting the number to a sufficient number and making it possible to easily distinguish the displayed vibration levels by color using, for example, a light emitter.

[Embodiments of the invention]

FIG. 1 shows the configuration of a vibration monitoring device based on the present invention. The vibration of a mechanical structure is converted into an electrical signal using the vibration detection circuit 1, and for the conversion, for example, a piezoelectric vibration element that measures the acceleration of vibration or an electrodynamic image pickup element that measures the speed is used. The electrical signal proportional to the imaging level thus obtained is amplified in the amplifier circuit 2 and input to the next stage level discrimination circuit 3. A plurality of reference levels are set in advance in the level discrimination circuit 3 in stages, and by comparing the vibration level input to this level discrimination circuit with these reference levels, it is possible to determine whether the input vibration level is '0'.
Determine which reference level it belongs to. For example, this standard level may be set to three levels, each of which is set at the upper limit of the level range where the machine condition is considered normal, the upper limit of the level range where caution is required, and the lower limit of the level range where the machine is considered dangerous. Determine which level the condition belongs to: normal, caution, or dangerous. This determination result is input to the display circuit 4 at the next stage.

The display circuit 4 is configured using, for example, color-coded light emitters, and depending on the output signal of the level discrimination circuit 3, lights up a specific light emitter according to the vibration level. For example, if the vibration is at a normal level, it lights up green, if the vibration is at a caution level, it lights up yellow, and if the vibration is at a dangerous level, it lights up red. Therefore,
The number of preset reference levels is also limited to a number necessary and sufficient to make a practical determination of the state of the machine.

FIG. 2 shows an embodiment of the structure of a vibration monitoring device having the circuit configuration shown in FIG. A piezoelectric vibrating element constituting the imaging detection circuit 1 is provided on the bottom surface of the cylindrical case 6 in which the mounting screw hole 7 is provided, and is connected to an amplifier circuit 2 disposed at an intermediate position within the case 6. . A level discrimination circuit 4 is disposed at a position substantially at the same height as the amplifier circuit 2, and its input side is connected to the amplifier circuit 2, and its output side is connected to the display circuit 4. The display circuit 4 is here constructed using light emitting diodes that emit light of different colors, and each light emitting diode is attached so that its light emitting portion faces outward from the upper end surface of the case 6. Reference numeral 5 denotes a power source for operating the circuits 1 to 4, and uses, for example, a mercury battery or a silver oxide battery that is small, has a large capacity, and has excellent voltage stability.

The vibration monitoring device configured in this way can be attached to the structure to be measured by screwing using the screw holes 7, or by making the case 6 from a ferromagnetic material such as iron and attaching it to a permanent disk-shaped structure. When installing by suction through the protrusion, install in a direction so that the vibration detection direction matches the direction of the arrow.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a vibration monitoring device includes a circuit for detecting vibrations of a structure as an IE electric signal, a circuit for amplifying the detected electric signal, and a circuit for detecting the vibration of a structure as an IE electric signal. a level discrimination circuit that classifies the level of detected and amplified vibrations according to a plurality of reference levels set in advance in stages; a circuit that displays the reference level to which the classified vibration levels belong; and the detection circuit and amplification circuit. The power supply that operates the circuit, level determination circuit, and display circuit is integrated into a compact unit, making it convenient for fixing to the part of the structure to be measured, and constantly detecting the vibrations of the structure during operation. When displaying the standard level, the number of stages of the displayed standard level is determined to be necessary or sufficient to practically determine the condition of the machine from the standpoint of improving plant availability and efficient maintenance and repair. Because the number is set to a large number, it is possible to determine the machine status at all times and extremely easily, and (1) there are many structures to be monitored, so there are many parts to be measured.
Even in cases where the structures are different from each other, it does not require much effort or time to determine the status of each of these structures.

(2) The measurement position and the method of installing the vibration detector are constant, so there are no individual differences in the discrimination results.

(3) Discrimination can be made without getting close to the machine in operation, allowing for safe discrimination work.

(4) Large-scale monitoring equipment is not required, and it can also be applied to existing machines.

Effects such as this can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing the circuit configuration of a simple vibration monitoring device of the present invention, and FIG. 2 is a structural diagram of an embodiment of the simple vibration monitoring device configured according to the circuit configuration of FIG. (a) is a front sectional view, and (b) is a plan sectional view. 1. Vibration detection circuit, 2. Amplification circuit, 3. Level discrimination circuit, 4. Display circuit, 5. Power supply. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1) A device for monitoring the level of vibration of a structure during operation, comprising a circuit that detects vibration of the structure as an electrical signal;
a circuit for amplifying the detected electric signal; a level discrimination circuit for classifying the level of the vibration detected and amplified as the electric signal according to a plurality of reference levels set in advance in stages; a circuit for displaying a reference level to which the vibration level belongs, the detection circuit, the amplification circuit,
A simple vibration monitoring device characterized by integrally comprising a level determination circuit and a power source for operating a display circuit, and constantly monitoring the vibration level of a structure during operation. 2) In the device according to claim 1, the detection,
A simple vibration monitoring device characterized in that a reference level to which an amplified vibration level belongs is displayed by color using a light emitting body.