JPH01265165A - Impulse recorder - Google Patents

Abstract

PURPOSE:To measure the impulse generation time, and also, to store the number of times by integrating an operation processing part for storing the number of times of generation of an impulse and the peak value generation time in a memory part and reading them out, and a power source part into one box body. CONSTITUTION:An impulse which has been detected by an impulse detector 1 is converted to a voltage, amplified by a prescribed ratio determined by a relation of an output and a G value by an amplifier 3, only its peak value is held in a peak holding part 4, and it is converted to a digital signal corresponding to the G value by an A/D converting part 5. Simultaneously, an output of the peak holding part 4 is compared with a value obtained by bringing a reference value which has been set by an impulse level setting switch corresponding to the G valued, to D/A conversion, by a comparator part 6, and only when said output has exceeded the reference value, the comparator outputs a trigger signal for recording an output of the converting part 5 in a memory 8 to an operation processing part 7. Simultaneously, the time extending from the set time to the generation of a trigger is calculated by the processing part 7. A trigger generating circuit is also calculated by the processing part 7.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is attached to the inside or outside of a product to measure the magnitude of impact that the product receives from handling during transportation or vibrations of transportation vehicles, as well as the time and number of times the impact occurs. This relates to a device for

Conventional technology Some electrical devices have been introduced to compensate for the shortcomings of the mechanical devices that have traditionally been used to measure and record the impact that products receive due to handling of cargo during transportation and the vibrations of transport vehicles. is used.

FIG. 3 shows a conventional electrical impact recording device, which includes an impact detector 101 that detects a mechanical impact and outputs it as an electrical signal, a reference time signal generator 102 that generates a reference time signal, and a reference time signal generator 102 that generates a reference time signal. Input the electrical signal of the shock detector 1o1, pass only the electrical signal with a preset signal level or higher, detect its peak value, and calculate the connection time of the electrical signal using the reference time pulse. Arithmetic unit 1
03, a memory unit 104 that converts the peak value and connection time of the electrical signal output from the calculation unit 103 into digital values, and storage in the memory unit 104.

It is constructed by incorporating a memory control unit 105 that controls readout and a power supply unit 106 that supplies power to each of the above-mentioned parts into a single box. This electric shock recording device detects shocks applied from the outside. The electric signal is output as an electric signal by the device 101, and the arithmetic unit 103 determines whether or not the electric signal exceeds a set level, and ignores the signal if it is below the set level. If the signal exceeds a set level, it is converted into a G value. At the same time, the pulse duration is calculated by combining a separately provided reference time signal.

Then, the G value and pulse duration are converted into digital signals, which are stored in the memory according to instructions from the memory control unit 105 and taken out to the outside as necessary.

Problems to be Solved by the Invention However, this electric shock recording device has drawbacks such as not being able to record the time of shock occurrence or the number of times the shock has occurred, and not being able to directly set the shock level using the G value. An object of the present invention is to eliminate the drawbacks of the conventional electric shock recording device described above, and to provide an easy-to-handle shock recording device capable of recording the time of occurrence of a shock. an impact detector that detects mechanical impact and outputs it as an electrical signal; a filter unit that removes noise applied to the impact detector; and a peak that holds the peak value of the output of the detector that occurs within a predetermined time. a hold section; an analog-digital converter section that converts the output signal of the peak hold section into a digital quantity; and an analog-digital converter that compares the peak value with a reference value set by the shock level setting switch, and converts the analog-digital converter only when the peak value is equal to or greater than the reference value. a comparator that sends a trigger signal to the arithmetic processing unit to take out the output; a time setting switch that sets the start time of the device to record the time when the peak value occurs; a reference to the time set by the time setting switch; It is equipped with a clock function that counts the time when the trigger signal is sent out from the comparator, and has a function that counts the number of times the trigger signal of the comparator has been output, that is, the number of times that an impact has occurred. The above-mentioned operation has a configuration in which an arithmetic processing unit that records and reads out the time of value occurrence and the number of times of impact occurrence in a memory unit; and a power supply unit that supplies power to each of the above-mentioned parts are incorporated into a single box body. In this configuration, an externally applied shock is converted into voltage in the detection section, and unnecessary noise components are removed in the filter section. The signal smoothed through the filter is amplified at a constant rate determined by the relationship between the output and the G value, and then
The signal is sent to a peak hold circuit, and only the peak value of the signal generated at regular intervals is held, and replaced by a digital signal corresponding to the G value in the analog-to-digital converter section. At the same time, the output signal of the peak hold section is led to the comparator section, where it is compared with an analog value obtained by digital-to-analog conversion of the reference value set by the shock level setting switch corresponding to the G value, and only when the reference value is exceeded, the comparator The unit generates a trigger signal for the arithmetic processing unit to record the output of the analog-to-digital converter in the memory unit.

At the same time, the time from the time set by a separately provided time setting switch until the trigger signal is generated is calculated by a clock function built in the calculation processing section. In addition, the number of occurrences of the trigger signal is counted in the arithmetic processing unit.The OG value and the impact are stored in the memory unit under the control of the arithmetic processing unit.The stored contents are changed as needed. Embodiment A block diagram of an embodiment of the present invention will be explained based on FIGS. 1 and 2. In the figure, reference numeral 1 denotes an impact detector using a piezoelectric acceleration pickup, and the piezoelectric element is fixed to the bottom of the box with a fixing screw in a direction that detects vibrations in a direction perpendicular to the bottom surface.

The electrical signal corresponding to the shock value of the impact detector 1 enters the filter section 2 . After unnecessary high-frequency noise is removed by the filter section 2, the signal is amplified by the amplifier 3 at a constant rate determined by the relationship between the output voltage of the acceleration pickup and the G value, and is guided to the peak hold section 4. The peak hold section 4 holds only the peak value during a cycle set in advance by the program of the arithmetic processing section 7. This held peak value is immediately sent to the analog-to-digital converter 6 and output as a digital value corresponding to the G value. On the other hand, the output of the peak hold section 4 is branched and input to the comparator section e. The comparator section 6 compares the analog output of the arithmetic processing section 7 corresponding to the reference value set by the shock level setter 9 with the output of the peak hold section 4, and only when the set value of the shock level setter 9 is exceeded. ,
A trigger signal is generated for the arithmetic processing unit 6 to receive the output of the analog-to-digital converter 6. The above operation is repeated at regular intervals under the control of the arithmetic processing section 7. On the other hand, the clock function of the arithmetic processing unit 7 is based on the day, hour, and minute time set at the time of measurement start with the time setting switch.
The time until the trigger signal of the comparator section 6 is generated is calculated to find the time when the trigger signal is generated. Further, the generation of the trigger signal from the comparator section 6 is integrated by the counting function of the arithmetic processing section 7 that counts the number of times the impact occurs.

The G value, impact occurrence time, and number of impact occurrences thus obtained are stored as a set of data at a designated address in the memory section 8 in a designated format under the control of the arithmetic processing section 7.

A reset switch 11, a start switch 12, a stop switch 13, a print switch 14, and an output terminal 16 are connected to the arithmetic processing section 7 and are used as follows. When the reset switch 11 is pressed, the arithmetic processing section 7
The reference value set by the shock level setting device 9 stored in the memory unit 9, the measurement start time set by the time setting switch 1o, the G value, the time of shock occurrence, and the number of shock occurrences stored in the memory unit 8. data is cleared 4
The reference value set by the impact level setting device 9 and the time setting switch 1 at the time when the reset switch 11 is pressed
The measurement start time set in Q is newly stored in the arithmetic processing section. Measurement is started by pressing the start switch 12. The measurement is stopped by pressing the stop switch 13.

At the end of the measurement, an external output device such as a printer is connected to the output terminal 16, and the memory contents are output under the control of the arithmetic processing section 7.

Effects of the Invention As described above, according to the present invention, it is possible to measure the time of impact occurrence, which could not be measured with conventional electric shock recorders, and it is also possible to store the number of impact occurrences. In addition, data analysis can be automated using an external output device that is processed in the form of electrical signals, and measurements can be made within a set period of time. It becomes possible to store and process a wide range of data, such as estimating the conditions under which shocks occur.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an impact recording device according to an embodiment of the present invention, FIG. 2 is a front view of the same impact recording device, and FIG. 3 is a block diagram of a conventional impact recording device. 1... Shock detector, 2... Filter,
3... Amplifier, 4... Peak hold section, 6... AD conversion section, 6... Comparator, 7... Arithmetic processing section , 8... memory,
9...... level switch, 1o...
Time setting switch @ Name of agent Patent attorney Toshio Nakao and 1 other person 1st
Figure 2

Claims (1)

[Claims] an impact detector that detects mechanical impact and outputs it as an electrical signal; a filter unit that removes noise applied to the impact detector; and a peak hold that holds the peak value of the output of the detector that occurs within a predetermined time. an analog-to-digital converter section that converts the output signal of the peak hold section into a digital quantity; and an analog-to-digital converter section that compares the peak value with a reference value set by the shock level setting switch, and converts the analog-to-digital converter only when the peak value is equal to or higher than the reference value. a comparator that sends a trigger signal to the arithmetic processing section to take out the output; a time setting switch that sets the operation start time of the device to record the peak value generation time; It has a clock function that counts the time when the trigger signal is sent out from the comparator, and has a function that counts the number of times the trigger signal of the comparator has been output, that is, the number of times that an impact has occurred. An impact recording device comprising an arithmetic processing unit that records and reads out the number of impact occurrences in a memory unit; and a power supply unit that supplies power to each of the units in a single box.