JPS6264920A - Simple vibration monitor apparatus - Google Patents

Abstract

PURPOSE:To dispense with a patrol worker in the operation of the titled apparatus and to attain to extend the life of the titled apparatus by reducing the consumption of a storage battery, by constituting a detection circuit, an amplifying circuit, a level discriminating circuit and a display circuit along with a power source comprising a storage battery operating said circuits. CONSTITUTION:The vibration of a machine structure is converted to an electric signal by a vibration detection circuit 1. Next, this electric signal is amplified by an amplifying circuit 2 to be inputted to the level discriminating circuit of the next stage and, subsequently, it is discriminated which preset levels of normality, causion and danger the vibration level inputted to said circuit 3 belongs to. Then, the discrimination result is inputted to a display circuit 4 and the specific light emitter corresponding to the vibration level is lighted on the basis of the output signal of the level discriminating circuit 3. By incorporating a switch circuit 6 continuously performing the closing and cutting-off of a storage battery power source 5 at a predetermined cycle in the output side of the power source 5, even if the vibration level is not always necessarily monitored in a timewise continuous manner, if monitoring is performed, for example, at a short time interval of a sec order, the state of a machine can be grasped.

Description

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

[Prior art and its problems]

The vibrations that occur during the operation of mechanical structures such as electric motors accurately represent the condition of moving parts, and they respond sensitively to both gradual aging and sudden abnormalities. It is considered essential to monitor the operation of vehicles.

This mechanical vibration is generally measured by electrically detecting the speed and acceleration of the vibration, and inputting the detected πL beak into a vibrometer that indicates the magnitude of the vibration. In large-scale plants in industrial fields such as electric power, steel, and chemicals that use a large number of rotating machines, it is necessary to improve plant operation rates and carry out maintenance and demolition effectively. Active surveillance is carried out, with lifeguards usually making regular rounds and taking footage.
Because the indicated values of the fW meter are read directly one by one, there are many machines that are subject to monitoring. This, combined with the large number of sites to be measured, requires a lot of effort and time.

(2) Because the vibration detector is installed and measured each time,
The measurement position for photographing, the method of installing vibration detectors, etc. are not necessarily constant, and as a result, 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 measurement of the S shift are carried out while the machine is operating.
It may be dangerous.

There were other problems. In order to solve such problems,
The imaging detection unit and the vibration level display unit are integrated and installed at the measurement site of the monitored structure, and the detected imaging level can be used to determine the state of the structure from a practical point of view. A vibration monitoring device has been proposed that simply displays which of the necessary and sufficient number of standard levels it belongs to, but the power source for operating the V; A small storage battery is used which is integrated with the detection 2 display section for each measurement site and extracts power while consuming pre-stored charge, which has the following drawbacks.

fil This monitoring device is intended to constantly monitor the vibrations of mechanical structures, so it operates even when the machine is stopped or when there is no patrolling worker.

(2) Because the storage battery is small, it wears out quickly.
Requires replacement every month.

[Purpose of the invention]

An object of the present invention is to provide a simple photographic monitoring device that does not require operation by a traveling worker, reduces consumption of a storage battery, and extends its lifespan.

[Key points of the invention]

In this invention, constant monitoring of the vibration level is not necessarily carried out continuously in time (but monitoring at certain short time intervals, for example on the order of seconds, is sufficient to grasp the state of the machine). Focusing on a certain point, this invention attempts to achieve the above object by incorporating a switch circuit on the output side of the storage battery power source to continuously turn on and off the power at a predetermined period.

[Embodiments of the invention]

Figure 1 (based on this invention) shows the circuit configuration of the imaging and monitoring device. Photographing a mechanical structure uses a vibration detection circuit l to convert electrical signals. For example, a piezoelectric type cantilever element that measures the acceleration of imaging or an electrodynamic type element that measures the speed is used.The electrical signal proportional to the vibration level obtained in this way is amplified in the amplifier circuit 2. The level discrimination circuit 3 has a plurality of reference levels set in advance in stages, and the vibration level input to this level discrimination circuit is input to the level discrimination circuit 3. It is determined which reference level the input vibration level falls within.

For example, this reference level is set in three levels, and each is set at the upper limit of the level range where the mechanical condition is considered normal, the upper limit of the level range where caution is required, and the lower limit of the level range where it is considered dangerous. Is the machine condition normal?
Determine which level of caution or danger it belongs to. This determination result is input to the display circuit 4 at the next stage.

The display circuit 4 is constructed using, for example, colored light emitters, and based on the output signal i of the level discrimination circuit 3, a specific light emitter is turned on according to the vibration level. For example, if the vibration is at a normal level, a green light is lit, if the vibration is at a caution level, the light is yellow, and if the vibration is at a dangerous level, a red light is lit. Therefore, the number of preset reference levels is also limited to the number necessary and sufficient to practically determine the state of the machine. In this way, the detected vibration level is displayed in different colors.
It becomes possible to grasp the status of machines extremely easily, and the practical effect is particularly great when a large number of machines are to be monitored. 5
is a small storage battery, for example, a mercury battery that is small, has a relatively large capacity, and has good voltage stability. The output side number of this storage battery is 1 at a predetermined period! ! To celebrate, turn on this power 2. J! , is connected to the output side of this timer switch and the timer ear terrorism a to disconnect the storage 1! The output of pond 5 is connected to circuit 1
．． A switch circuit 6 is connected to a ring-shaped wiring 6b for distributing 2,3.4i.

The timer switch 6a, for example, as shown in FIG.
Add an external circuit to the operational amplifier OF and connect its output terminal a.
For example, 'rl=o, on for s seconds.

T2: Output a periodic continuous signal that is off for 5 seconds, and use this output to power the storage battery power source 5? Insert and cut into 4 pieces.

Here, RTI is a resistor that sets the time 'rl of the output side waveform in combination with the time constant capacitor CTI,
T2 is a resistor that also sets the time 1°2.

FIG. 3 shows an embodiment of the structure of a vibration monitoring device having the circuit structure M shown in FIG. A piezoelectric vibrating element constituting an imaging detection circuit l is provided on the bottom surface of the cylindrical case 8 provided with a mounting screw hole 9, and is connected to an amplifier circuit 2 disposed at an intermediate position within the case 8. . A level discrimination circuit 3 is arranged at a position substantially at the same height as the amplifier circuit 2, and its input terminal 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 8.

The vibration monitoring device configured as described above can be attached to the structure to be measured (either by using the screw hole 9 and attaching it with a screw, or by making the case 8 using a ferromagnetic material such as iron, It is attached by attraction using a disk-shaped permanent magnet, and is attached 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 explanation, according to the present invention,
A small storage battery integrated with the circuit in the monitoring device is continuously turned on and off to one circuit at a cycle of, for example, 0.5 to 5.0 seconds, so there is no need to monitor machine vibration. It is also easy to extend the life of the storage battery by, for example, ten times or more while constantly monitoring the battery without any trouble.

In addition, according to the present invention, the imaging monitoring cover is made smaller by integrating the circuit and the power supply, so it is convenient to fix to the part of the structure to be measured, and the vibration level can be displayed in stages. (1) When there are many packages to be monitored and therefore many parts to be measured, constant monitoring of security and imaging is easily possible, and vibration monitoring does not require much effort and time. do not.

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

(3) It is easy to identify machines without having to get close to the machine in operation, allowing for safe identification work.

(4) Can be applied to any number of machines that do not require monitoring equipment involving dogs (or existing ones).

Effects such as these can also be obtained.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the circuit configuration of the simple vibration monitoring device of the present invention, and Fig. 2 is a schematic diagram showing the circuit configuration of the simple vibration monitoring device of the present invention. Continuously (Circuit diagram showing an example of the circuit configuration of a timer switch that performs this process,
FIG. 3 is an fDt diagram of Embodiment 1 of the simple vibration monitoring device constructed according to the circuit configuration shown in FIG.
1 is a plan view, and (b) is a front sectional view. DESCRIPTION OF SYMBOLS 1... Vibration monitoring device, 2... Amplification circuit, 3... Level discrimination circuit, 4... Display circuit, 5... Storage battery, 6
...Sui, child circuit. Figure 1 Figure 3

Claims (1)

[Scope of Claims] 1) A device for monitoring the level of vibration of a structure during operation, comprising a circuit that detects the 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; and the classified vibration level. a circuit that displays the reference level to which the reference level belongs, and a power source consisting of a storage battery that generates an electromotive force from pre-accumulated charges and operates the detection circuit, amplification circuit, level discrimination circuit, and display circuit;
A simple vibration monitoring device characterized in that it is integrated with a switch circuit that continuously turns on and off the power at a predetermined cycle. 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.