JPH0288932A - Impact recording device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is designed to measure the maximum value of the shocks that the product repeatedly receives from handling during transportation and vibrations of transportation vehicles, by measuring Km inside and outside the product. This relates to a device for recording and displaying.

Conventional technology An example of a method for measuring and recording shocks received by a product due to cargo handling during transportation or vibrations of a transportation vehicle is shown in FIG.

In this device, an impact applied from the outside is converted into a voltage by an impact detection section 1, and unnecessary noise components are removed by a filter 2. The signal smoothed through the filter 2 is amplified by the amplifier 3 at a fixed rate determined by the relationship between the output and the G value, and then sent to the peak hold circuit 4, where the signal generated during the period is amplified at a fixed period. Only the peak value is held and replaced by a digital signal corresponding to the G value in the analog-to-digital converter section 5. At the same time, the output signal of the peak hold section 4 is led to the comparator section 6, where it is compared with an analog value obtained by digital-to-analog conversion of the reference value set by the shock level switch 9 corresponding to the G value, and if it exceeds the reference value, The comparator unit 6 generates a trigger signal for the arithmetic processing unit 7 to record the output of the analog-to-digital converter 6 in the memory unit 8. At the same time, the time from the time set by the separately provided time setting switch 10 until the trigger signal is generated is determined by the arithmetic processing section 7.
Calculated by the built-in clock function. Further, the number of occurrences of the trigger signal is also counted in the arithmetic processing section 7. G
The value, impact occurrence time, and number of occurrences are stored in the memory section 8 under the control of the arithmetic processing section 7. The stored contents are then taken out to the outside according to instructions from the arithmetic processing section 7 as necessary. In addition, in the figure, 9 is a shock level setting switch, 11 is a lyse futonych, 12 is a nutatnyyrich, 13 is a 7th hupnyi sochi, 14 is a print switch, 16 is an output terminal, 16 is a power supply, 17 is a charging terminal, 18 indicates a power switch.

Problems to be Solved by the Invention The shock recording device having the above configuration has a complicated circuit because the memory section 8 records a value exceeding a set shock value and the time of occurrence of the shock. The wear and tear is also large.

The present invention takes into account the above-mentioned conventional problems and aims to provide a device that can accurately measure and record impact using a simple circuit.

Means for Solving the Problems In order to solve the above problems, the present invention provides an impact detector that detects mechanical impact and outputs it as an electrical signal, and a filter section that removes noise contained in the output of the impact detector. , a peak hold section that holds the peak value of the output of the detector occurring within a predetermined time; an analog-digital converter section that converts the output signal of the peak hold section into a digital quantity; and an analog-digital converter section that converts the output signal of the analog-digital converter section. an arithmetic processing unit that records and reads information in a memory unit built into the arithmetic processing unit and disconnects the power supply to circuits other than the arithmetic processing unit when the power supply voltage falls below a set value; The shock recording device has a structure in which a digital display for displaying data and a power supply unit for supplying power to each of the above-mentioned parts are incorporated into a single box.

Function: In the shock recording device configured as described above, an externally applied shock is converted into voltage by the piezoelectric accelerator Bi-Aqua and Puffer which constitute the detection section, and is amplified by the amplifier, and then unnecessary noise components are removed by the filter section. Ru.

After passing through the filter section and amplifying the signal at a constant rate determined by the relationship between the acceleration P/Aqua/Fugu and the G value, it is sent to the peak hold circuit. Only the peak value that occurs is held and converted into a digital signal corresponding to the G value in the analog-to-digital converter section. This digital signal is stored in a memory section with a built-in arithmetic processing section. When a new impact value is added, the series of operations described above is performed, but the arithmetic processing section first compares it with the data stored in the internal memory section of the arithmetic processing section, and stores that value first. Only when the data is larger than the current data, the data in the arithmetic processing section built-in memory section is rewritten and stored with new data.

In this way, only the maximum value of the shock values input after the start of measurement is always stored in the memory section built into the arithmetic processing section. The stored data is displayed on the digital display according to instructions from the arithmetic processing section.

Embodiments Below, embodiments of the present invention will be explained based on FIGS. 1 and 2. As shown in the figure, the impact detector 21 is constructed using a piezoelectric acceleration pick-up knob, and the piezoelectric element is fixed to the bottom of the box with a detector fixing screw in a direction that detects an impact perpendicular to the bottom surface. Ru.

The electrical signal corresponding to the shock value passes through the amplifier section 22 and enters the filter section 23 . After unnecessary high-frequency noise is removed by the filter section 23, the signal is amplified at a constant rate determined by the relationship between the acceleration peak-up output voltage and the G value in the absolute value conversion section 24, and is guided to the peak hold section 26. The value of the peak hold section 26 is immediately sent to the analog-to-digital converter 26 and output as a digital value corresponding to the G value. This output is stored by the arithmetic processing section 27 in the arithmetic processing section built-in memory section 2B. When a new shock is applied, the series of operations described above is performed, and only when the output data of the analog-to-digital converter 26 is larger than the data previously stored in the memory section 2B by the arithmetic processing section 27, the built-in arithmetic processing section New data is stored in the memory section 28.

The above operations are repeated at regular intervals under the control of the arithmetic processing section 27.

On the other hand, the arithmetic processing section 27 compares the output of the voltage detection section 30 with a reference value set in advance in the program in order to monitor the output voltage of the power supply 34, and removes the arithmetic processing section 27 when the value becomes less than the reference value. Disconnect power to all circuits. This can prevent abnormal values from being stored in the memory section 2B due to malfunction of the electric circuit when the power supply voltage drops.

A reset switch 31 and a display switch 32 are connected to the arithmetic processing section 27 and are used as follows. When the reset switch 31 is pressed, the arithmetic processing section built-in memory section 2
8 data is erased.

When the display switch 32 is pressed, the data in the memory section 28 is displayed on the display 29.

If the power supply voltage drops and the arithmetic processing section 27 does not work, the display 29 will naturally not display any information.

In this case, the power switch 33 is turned off and the battery is replaced, or a return power switch 33 connected to an external power source is connected. As a result, the arithmetic processing unit 27 detects that the power necessary for normal operation has been supplied and returns to the operating state.

36 in the figure is an external power input terminal.

Effects of the Invention As described above, according to the present invention, it has a function of storing only the maximum value, which conventional electric shock recording devices did not have, and also has a built-in display, making it easy to increase the number of uses. are doing. Furthermore, by limiting the data to be stored, the power consumption of the circuit can be suppressed, allowing continued use with a small battery, and the external dimensions can also be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an impact recording device according to an embodiment of the present invention, FIG. 2 is an external perspective view of the same, and FIG. 3 is a block diagram of a conventional impact recording device. 21: Shock detector, 22: Amplifier, 23: Filter, 24: Absolute value converter, 26: Peak hold , 26...
...Mu/D conversion section, 27... Arithmetic processing section, 2
8...Memory unit, 29...Display unit, 3
0...Voltage detection unit, 31...Reset reset, 32...Display switch, 33...
...Power supply, 34...Power supply, 36.
...External power input terminal. Name of agent: Patent attorney Shigetaka Awano et al. 14th
L no Shin 2

Claims (1)

[Claims] an impact detector that detects a mechanical impact and outputs it as an electrical signal; a filter unit that removes noise included in the output of the impact detector; and a peak value of the output of the detector that occurs within a predetermined time period. an analog-digital converter unit that converts the output signal of the peak-hold unit into a digital quantity, and records the output of the analog-digital converter unit in a memory unit built in an arithmetic processing unit;
an arithmetic processing unit that reads data and disconnects the power supply to circuits other than the arithmetic processing unit when the power supply voltage becomes equal to or less than a set value; and a digital display that displays data in the memory unit built into the arithmetic processing unit; A power supply unit that supplies power to each of the above parts is 1
An impact recording device built into two boxes.