JPH0288933A - Impact measuring instrument - Google Patents

Abstract

PURPOSE:To suppress the consumption of a battery in the manner of simplifying an electric circuit and to realize a miniaturization in dimension by providing a peak hold part, analog/digital converter, digital hold circuit and display part. CONSTITUTION:The impact applied from the outside is converted to a voltage in a piezoelectric type pickup for acceleration consisting of a detection part 21, and unrequired noise components are eliminated in a filter part 23 after being amplified in an amplifier 22. Smoothed signals are forwarded to a peak hold circuit 25, wherein the peak value is held, and converted to a digital signal in an analog/digital converter circuit 26, then forwarded to the digital hold circuit 27 to be held, and displayed on the display device 28 by means of pushing a display switch 12. With this arrangement, the impact measurement value can be surely recorded with the simple circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is designed to be attached to the inside or outside of a product to intentionally generate shock conditions that the product receives during transportation, either in a laboratory or in actual use. This invention relates to a device that detects and displays the impact value of each part of a product.

An example of a conventional technique for measuring the impact that a product receives during transportation or in a laboratory 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 G@ in the analog-to-digital converter section 6. 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 5 in the memory unit 8. At the same time, the time from the time set by the separately provided time setting switch 1o until the trigger signal is generated is determined by the arithmetic processing unit 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 transferred to the outside according to instructions from the arithmetic processing section 7 as necessary.

In the figure, 9 is a shock level setting switch, 11 is a reset switch, 12 is a start switch, 13 is a stop switch, 14 is a print switch, 16 is an output terminal, 16 is a power supply, 17 is a charging terminal, and 18 is a power supply Shows the switch.

Problems to be Solved by the Invention The impact measuring device having the above configuration is characterized by storing and displaying only the maximum value of multiple impact values. For the purpose of performing measurements only once, the circuit is complicated and the power supplied from the power supply section is consumed greatly.

The apparatus of the present invention takes into consideration the above-mentioned conventional problems and attempts to provide an apparatus that can reliably measure and record impact using a simple circuit.

Means for Solving the Problems To achieve the above object, the present invention includes an impact detector that detects mechanical impact and outputs it as an electrical signal, and a filter unit 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 filter section, an analog-digital converter section that converts the output signal of the peak hold section into a digital quantity, and a digital hold section that holds the output of the analog-digital converter section. , a display unit that digitally displays the output of the digital hold circuit, a power supply unit that supplies power to each of the units, and a voltage detection unit that checks the voltage of the power supply unit are incorporated into one box. This is the structure of the vessel.

Function: In the shock measuring instrument having the above structure, an externally applied shock is converted into voltage by the piezoelectric acceleration pickup constituting the detection section, amplified by the amplifier, and then unnecessary noise components are removed by the filter section.

The signal smoothed through the filter section is amplified at a constant rate determined by the relationship between the acceleration pickup and the G value, and then sent to a peak hold circuit where the peak value is held. The output of the peak hold circuit is converted into a digital signal corresponding to the G value in the analog-to-digital converter circuit, and immediately sent to the digital hold circuit to be held.

The held data is displayed on the display by pressing the display switch.

Embodiments Below, embodiments of the present invention will be explained based on FIGS. 1 and 2.

As shown in the figure, the detection section 21 is constructed using a piezoelectric acceleration pickup, and is fixed to the bottom of the box with a detector fixing screw in such a direction that the piezoelectric element detects an impact perpendicular to the bottom surface. The electrical signal corresponding to the shock value passes through the amplifier section 22 and enters the filter section 23 . The signal is amplified at a constant rate determined by the relationship between the output voltage of the acceleration pickup and the G value in the absolute value conversion section 24 after removing unnecessary high-frequency noise in the filter section 23, and guided to the peak hold section 26.

The value of the peak hold unit 25 is immediately sent to the analog-to-digital converter unit 26 and output as a digital value corresponding to the G value. This output is sent to the digital hold circuit 27 and held.

A display switch 29 is connected to the digital hold circuit 27, and data is sent to the display 28 and displayed only when the display switch 29 is pressed.

On the other hand, the voltage detection unit 30 operates only when the voltage detection switch 32 is connected, and lights up the LED 31 if the power supply 34 is equal to or higher than a certain voltage value. Further, the power switch 33 connects or disconnects the power supply to the electric circuit.

Effects of the Invention As described above, the present invention simplifies the electric circuit by limiting the purpose to one-time measurement compared to conventional electric shock measuring instruments, reduces power consumption, and has a small size. has been realized. This makes it easy to attach the product to the outside or inside of the product to be subjected to impact testing, and enables simultaneous measurement of multiple locations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an impact measuring instrument 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 measuring instrument. 21: Shock detector, 22: Amplifier, 23: Filter, 24: Absolute value converter, 26: Peak hold , 26...
...Mu/D converter, 27...Digital hold, 28...Display device, 29...Display switch, 3o...Voltage detection section, 31...
・IJD. 32... Voltage detection switch, 33...
Power switch, 34...Power supply.

Claims (1)

[Claims] an impact detector that detects mechanical impact and outputs it as an electrical signal; a filter section that removes noise included in the output of the impact detector; a peak hold section that holds the peak value of the output of the filter section; an analog-digital converter section that converts the output signal of the peak hold section into a digital quantity; a digital hold section that holds the output of the analog-digital converter section; a display section that digitally displays the output of the digital hold circuit; An impact measuring instrument that incorporates a power supply unit that supplies power to each part and a voltage detection unit that checks the voltage of the power supply unit into a single box.