JP4708709B2 - Working meter - Google Patents

Description

  The present invention relates to a working meter that can measure the usage time of a hydraulic breaker or the like, and in particular, a working meter that can accurately measure the usage time without being broken even if the installation location is a location with strong vibration. About.

  Conventionally, in rental of a hydraulic breaker that is connected to a hydraulic excavator and used for crushing work, etc., a rental fee has been set according to the usage time of the hydraulic breaker and the like. Normally, this usage time is done by the self-report of the user, and the rental fee is fixed according to the usage time of the self-report.

  In addition, when renting a hydraulic excavator that is connected to a hydraulic breaker, etc., a method may be considered in which a counter is provided near the operation panel of the hydraulic excavator body and the usage time is accumulated with the counter for the time the hydraulic breaker is operated. It is done.

  If self-reporting, the error is large and there is a possibility that the rental fee will be reduced for the rental company, and conversely, there is a problem that the user has trouble calculating the usage time.

  In addition, it is possible to calculate the correct usage time by installing a counter on the operation panel of the hydraulic excavator, but when renting only a hydraulic breaker etc., separate rental fees are calculated for the hydraulic excavator and the hydraulic breaker etc. In this case, there is a problem that it is impossible to calculate the usage time of only the hydraulic breaker or the like.

  Furthermore, not only for the calculation of such rental fee, it is also necessary to perform maintenance on the hydraulic breaker and the like every predetermined usage time so that the hydraulic breaker can be used safely for a long period of time.

  Here, assuming that a counter for measuring usage time is provided in a hydraulic breaker or the like, the counter provided in the hydraulic breaker or the like is also affected by a large acceleration change caused by the operation of the hydraulic breaker or the like. The strong force accompanying the counter's own weight works, and the parts that make up the counter are damaged, especially when there is a normal battery inside, the positive electrode material and negative electrode material of the battery are mixed so that it can no longer function as a battery In addition, when the power supply is received from the hydraulic excavator body via the cable without incorporating the battery in the counter, the failure rate can be reduced by the amount not incorporating the battery, but the power supply for the hydraulic excavator There is no line around the hydraulic breaker, etc., and it is necessary to run the cable for a long time. It has the task.

  The present invention has been made to solve the above-described problems, and is difficult to break even under the influence of acceleration change due to the operation of a hydraulic breaker or the like, and can accurately measure the usage time of a hydraulic breaker or the like with a built-in battery. The purpose is to provide a working meter.

  The working meter according to the present invention detects an impact sensor that generates a detection voltage in response to an impact, a battery unit that generates a current, a current supplied from the battery unit, and detects when the detection voltage is generated from the impact sensor. A control unit that measures a measurement time until no voltage is generated, and a storage unit that stores the measurement time and / or an integrated time obtained by integrating the measurement time, and the control unit stores the measurement time and / or the integrated time A working meter for writing to the unit, wherein the detection voltage from the impact sensor is used as a switch signal to supply a current from the battery unit to the control unit while the switch signal is being output. As described above, in the present invention, an impact sensor that generates a detection voltage in response to an impact, a battery unit that generates a current, and a current supplied from the battery unit are detected and detected from the time when the detection voltage is generated from the impact sensor. A control unit that measures a measurement time until no voltage is generated, and a storage unit that stores an accumulated time obtained by integrating the measurement time, and the switch signal is output using the detection voltage from the impact sensor as a switch signal. Since the battery unit supplies current to the control unit while the control unit writes the measurement time and / or integration time in the storage unit, the battery unit supplies current to the control unit when no switch signal is output. First, when the switch signal is output, the battery unit supplies current to the control unit, and when the control unit receives supply of this current, the detection voltage from the impact sensor is generated. The measurement time until no output voltage is generated is measured, the integration time is updated to reflect the measurement time, and the updated integration time is written in the storage unit. Since there is no necessary power consumption and the power consumption is small, it can be used for a long time even with a battery part with a small battery capacity, and the battery capacity and battery weight and size are small with little battery capacity. In particular, the weight of the battery, which occupies most of the weight, is small, so the weight of the working meter itself is reduced, and the force due to its own weight under strong vibrations is also reduced. It can operate stably for a long time with a low failure rate.

  Also, in the working meter according to the present invention, the control unit operates only for a certain period every first predetermined period as necessary, and enters a mode in which the power consumption is small outside the certain period. As described above, in the present invention, since the control unit operates only for a certain period every first predetermined period and is in a mode of low power consumption outside the certain period, a current is supplied to the control unit only at the time of measurement. In addition, it measures and stores only for a certain period by dividing every first predetermined period, and it becomes a mode with less power consumption outside the certain period and does not store, and the battery is lighter And stable operation for a long time with a low failure rate.

  In addition, the working meter according to the present invention provides a switch signal for at least a time until the control unit calculates the accumulated time and writes it to the storage unit even if the detection voltage from the impact sensor is not generated. A time constant part for outputting is provided. As described above, in the present invention, even when the detection voltage from the impact sensor is not generated, the time constant unit that outputs the switch signal for at least the time until the control unit calculates the accumulated time and writes it to the storage unit. Therefore, even after the impact disappears and the detection voltage from the impact sensor no longer occurs, the switch signal is output for the time until the control unit calculates the accumulated time and writes it to the storage unit, and this detection voltage is generated. The current is supplied from the battery unit even while the switch signal is output after the power is lost, the control unit can perform stable calculation and writing, and the accurate integration time can be stored in the storage unit. it can.

  In the working meter according to the present invention, if necessary, the control unit does not measure the measurement time when the detection voltage generated from the impact sensor is a detection voltage having a voltage level lower than a predetermined voltage level. Thus, in the present invention, when the detection voltage generated from the impact sensor is a detection voltage having a voltage level lower than the predetermined voltage level, the control unit does not measure the measurement time, so the hydraulic breaker joined to the hydraulic shovel When measuring the usage time with this working meter attached, vibrations that are less than the specified voltage level, ie less than the specified level, are distinguished from vibrations that are greater than the specified voltage level, that is, greater than the specified level, and are greater than the specified level. Vibrations other than using the hydraulic breaker as work (for example, when moving the hydraulic shovel to another work target position, the vibration is transmitted to the hydraulic breaker by the caterpillar of the hydraulic shovel and working. When the meter's shock sensor detects) It can be measured.

  In addition, the working meter according to the present invention measures the measurement time as required when the control unit detects at least one of detection voltages generated from the impact sensor within a certain period of time is a detection voltage lower than a predetermined voltage level. It is something that does not. As described above, in the present invention, the control unit does not measure the measurement time when at least one of the detection voltages generated from the impact sensor within a certain period is a detection voltage smaller than the predetermined voltage level. When this working meter is attached to a joined hydraulic breaker and the usage time is measured, vibrations that are less than the specified voltage level, that is, less than the specified level, are distinguished from vibrations that are greater than the specified voltage level, that is, greater than the specified level. It is possible to measure only vibrations that are greater than the level of measurement, ignore the vibrations other than using a hydraulic breaker as a work, and measure the exact usage time. It is possible to load hydraulic shovels by determining whether multiple vibrations over a period of time are greater than the specified level. Lower, unloading, mounting of the hydraulic breaker, also specified level than obtaining increased vibration caused by the removal or the like of the hydraulic breaker off the target for measurement, it can be measured more accurate use time.

  In addition, the working meter according to the present invention invalidates a detection voltage having a voltage level smaller than a specified voltage among the detection voltages generated from the impact sensor, if necessary. As described above, in the present invention, the detection voltage having a voltage level lower than the specified voltage among the detection voltages generated from the impact sensor is invalidated. Is not output, the battery unit does not supply current to the control unit, and the control unit does not start up. As long as it occurs, the operating time can be correctly measured with the minimum power consumption of supplying current from the battery unit to the control unit and operating, and stable operation can be performed for a long time with a low failure rate.

  Further, in the working meter according to the present invention, the control unit writes the accumulated time and / or the measurement time in the storage unit every second predetermined period as necessary. As described above, in the present invention, since the control unit writes the accumulated time and / or measurement time in the storage unit every second predetermined period, control is performed if nothing occurs during the measurement. The operating time can be accurately maintained by updating the accumulated time and writing it to the memory unit once before the unit stops, but the measurement time is reset beyond the maximum measurement time during measurement. If the memory of the control unit is cleared by vibration, heat, etc., current is temporarily not supplied to the control unit due to poor contact, and even if it operates normally again, The measurement time will be lost, and there is a risk of storing the accumulated time with a large error in the storage unit. By calculating and writing the accumulated time every second predetermined period, the abnormal operation is performed. Even if it occurs, the previous time The total accumulated time has been written correctly until the last accumulated time has been written, and the time between when the previous accumulated time was written and when normal operation has been recovered from normal operation is a maximum error and the entire use The influence on the accuracy of time can be reduced, and the correct use time can be maintained as much as possible. In particular, since frequent use of abnormal states makes it difficult to maintain the correct use time, it is preferable to leave such an abnormal state in the storage unit.

  In addition, the working meter according to the present invention includes an external interface for reading the accumulated time and / or measurement time stored in the storage unit from the outside as necessary, and reads the accumulated time via the external interface. It receives power from the outside. As described above, in the present invention, when the accumulated time is read through the external interface, power is supplied from the outside. Therefore, an external device that easily receives power is connected to the external interface of the working meter. When reading the integration time from the external device, it is necessary to operate the control unit and read the integration time from the storage unit. However, the power for such operation is not from the battery unit but from the external device. In this working meter when connected to an external device, there is no power consumption of the battery part, the weight of the battery can be reduced, and stable operation can be performed for a long time with a low failure rate. .

(First embodiment of the present invention)
A working meter according to a first embodiment of the present invention will be described with reference to FIGS. 1 is a circuit block diagram of a working meter according to this embodiment, FIG. 2 is a front sectional view, a top sectional view, a side view, and a side half sectional view of the working meter according to this embodiment, and FIG. 3 is according to this embodiment. 4 is a partially transparent view of FIG. 3, FIG. 5 is a circuit diagram of the working meter according to the present embodiment, FIGS. 6 and 7 are operation flowcharts of the working meter according to the present embodiment, and FIG. FIG. 8 is a diagram showing the relationship between working meter periods according to the present embodiment, and FIG. 9 is a front view of the reader device of the working meter according to the present embodiment. 2A is a side view, FIG. 2B is a top sectional view, FIG. 2C is a side half sectional view, FIG. 2D is a front sectional view, and FIG. 2E is a front view. .

  1 and 2, the working meter according to the present embodiment receives an impact sensor 1 that generates a detection voltage in response to an impact, a battery unit 2 that generates a current, and a current supplied from the battery unit. The control unit 3 that measures the measurement time from when the detection voltage is generated from the impact sensor until the detection voltage is no longer generated, the storage unit 4 that stores the integration time obtained by integrating the measurement time, and the storage unit 4 that stores the integration time from the outside The external interface 5 for reading out the accumulated time and the switch unit 7 for switching the current from the battery unit 2 to the control unit 3 are provided, and this switch signal is output using the detected voltage from the impact sensor 1 as a switch signal. During this time, the switch unit 7 is turned on to supply current from the battery unit 2 to the control unit 3, and the control unit 3 reads the accumulated time from the storage unit 4. Is the time between measurement time and the integration time and configured to write to the storage unit 4 by adding the. 1 represents a current supply line to the control unit 3.

  The impact sensor 1 is formed by disposing a piezoelectric element as detection means on a metal plate. This piezoelectric element is formed with electrodes on both sides of a piezoelectric layer such as piezoelectric ceramics. Here, the impact sensor 1 is not limited to such formation, and may be any device that can detect an impact and is small. In particular, in the present invention, since it is used under strong vibration, it is preferable that the weight of the impact sensor 1 is small.

  The battery unit 2 is formed by connecting a plurality of batteries in series or in parallel. This battery has a flat shape, and corresponds to a so-called coin-type battery, button-type battery, or the like. In this battery, a positive electrode made of manganese dioxide is pressure-bonded to a stainless steel positive electrode can, the positive electrode is covered with a separator, a negative electrode made of a lithium alloy is pressure-bonded to the upper surface of the covered separator, and the negative electrode can is packed with the positive electrode can. Are fitted together. However, the configuration of this battery is merely an example of a coin-type battery, and may be a battery having another configuration (manganese battery, alkaline battery, Ni / Cd storage battery, nickel-metal hydride storage battery, lithium ion storage battery). Batteries (silver oxide battery, air battery) having different materials and constituent materials for the negative electrode may be used. A battery with a flat shape has a positive electrode, a separator, and a negative electrode that are flat according to the outer shape. The positive electrode, the separator, and the negative electrode are resistant to vibration in the facing direction, but vibration in a direction perpendicular to the facing direction. It is weak to. As a cause of this, when vibration in a direction perpendicular to the facing direction is applied, each of them deviates from its original position, the positive electrode and the negative electrode are separated from the separator, the separator is destroyed, the positive electrode and the negative electrode are crossed, and normal electrons are crossed. This is because the movement becomes impossible and the current cannot be supplied. Therefore, when a working meter is attached, it is necessary to dispose the battery part in a vibration-resistant direction in consideration of the surface direction of the battery. That is, it is desirable to arrange the battery so that the longitudinal direction of the battery is perpendicular to the vibration direction. Here, the battery unit 2 is composed of a plurality of batteries. Although it is possible to configure the battery unit 2 even with one large battery, the battery unit 2 is configured with one large battery. In some cases, the large battery is subjected to its own weight during vibration and vibrates inside the outer case 8. Similarly, the vibrated large battery contacts other components disposed in the outer case 8 and damages the contacted components by giving a large impact. In addition, the vibrated large battery may also come into contact with the outer case 8, and the large battery itself may be damaged. Forming the resin can provide a buffering action and prevent these damages, but it is still uncertain because a large force acts on a large battery during vibration. Therefore, the battery unit 2 is composed of a plurality of batteries, and the size of each battery is reduced. Naturally, the weight of the battery thus reduced during vibration is reduced, and the impact when it comes into contact with other components can be suppressed. By forming the battery portion 2 from a plurality of batteries and then forming the resin, vibrations generated in the respective batteries can be further suppressed.

  The control unit 3 is configured by mounting elements / components such as resistors, capacitors, diodes, FETs, EEPROMs, MPUs, and CPUs on a printed circuit board. Although the control unit 3 can be configured without using an MPU or CPU chip, the mounted control unit 3 generally becomes larger or heavier unless an MPU or CPU is used. When the MPU or CPU is used to reduce the size and weight of the working meter itself, the weight of the working meter itself is reduced, and it is possible to manufacture a product that is not easily broken even under strong vibration.

  Further, the control unit 3 operates only for a predetermined period every predetermined period (hereinafter, the predetermined period is hereinafter referred to as a first predetermined period), and stands by in a mode of low power consumption outside the predetermined period (FIG. 8). (See (b)). The operation here refers to an operation unique to the present working meter, and if the control unit 3 is implemented by a microcomputer, an operation that is necessary at least all the time when the microcomputer is on is not a target. The operation unique to the working meter corresponds to an operation of measuring the measurement time, an operation of adding the integration time and the measurement time, and writing in the storage unit 4 as the integration time. Even if the time for measuring the measurement time is operated only for a certain period, the time outside the certain period is not counted, and the period outside the certain period is also found because it is the certain period for each first predetermined time. For example, if only 20 [ms] is operated every 1000 [ms] (1 [s]), the time outside the fixed time is 1000 [ms] −20 [ms] = 980 [ms]. However, this method causes an error of ± 980 [ms] at the maximum in one measurement time measurement. Although such an error occurs, only 20 [ms] operate in 1000 [ms], which leads to a significant reduction in power consumption.

  In addition, the control unit 3 does not measure the measurement time when at least one of the detection voltages generated from the impact sensor 1 for a certain period is a detection voltage smaller than the predetermined voltage level. It has already been described that “the control unit operates only for a certain period every predetermined period and waits in a mode with low power consumption outside the certain period”, but here “a certain period” (hereinafter, for operating The “control period does not measure the measurement time when at least one of the detection voltages generated from the impact sensor for a certain period is a detection voltage lower than the predetermined voltage level.” For a certain period of time) (see FIG. 8A). In other words, a part of the fixed period for operating becomes a fixed period for measurement. That is, during most of the fixed period for operation, the control unit 3 determines whether or not at least one of the detection voltages generated from the impact sensor 1 has a detection voltage lower than the predetermined voltage level. If there is no smaller detection voltage, it stands by in a mode with low power consumption. Here, if there is at least one detection voltage lower than the predetermined voltage level, the control unit 3 stops measuring the measurement time and does nothing, or adds the measurement time and the integration time to the storage unit as the integration time. Write and end operation. However, in the current operation, the fixed period for measurement occupies most of the current period, but naturally other processing may be included.

  The control unit 3 reads the accumulated time from the storage unit 4 and adds the read accumulated time and the measurement time to write the accumulated time in the storage unit 4 (hereinafter, this operation is referred to as an accumulated time writing operation). ), And the accumulated time writing operation is performed every predetermined period (hereinafter, the predetermined period is hereinafter referred to as a second predetermined period). If this accumulated time writing operation is performed at least once before the detection voltage from the impact sensor 1 is generated and the control unit 3 does not operate, the correct accumulated time is written in the storage unit 4. However, by performing the accumulated time writing operation every second predetermined period, even when an abnormal situation occurs, the error of the maximum second predetermined period only occurs, and after the return, the measurement time is measured again. Can be migrated. That is, using FIG. 8D, when there are 11 cells, the accumulated time writing operation is performed only with the 11th cell if the former method is used. If the latter method is used, the accumulated time writing operation is performed for each cell. When an abnormal situation occurs in the sixth cell, the period from the first to the sixth is not added to the integration time in the former method, but the period from the first to the fifth is not added in the latter method. Has already been added to the accumulated time. Here, the “second predetermined period” and the first period may be the same depending on the setting, but may be different. However, since the accumulated time writing operation is written in the storage unit 4 and depends on the mounting method, it is an external process and therefore consumes a large amount of power, and is preferably at least several times longer than the first predetermined period (FIG. 8). In the case of (c), it is 10 times, and the cumulative time writing operation is performed in the 10th cell of the double frame line). If the first predetermined period already exemplified is 1000 [ms], for example, the second predetermined period in the accumulated time writing operation is 10000 [ms].

  Specifically, the storage unit 4 includes an EEPROM and an EPROM, may be configured by other storage elements, and may be implemented by the microprocessor 3 a together with the control unit 3.

  When an external device is connected to the external interface 5 and the accumulated time is read from the storage unit 4 via the control unit 3, the control unit is connected from the external device via the external interface 5 without supplying current from the battery unit 2. It is assumed that a current for 3 etc. is supplied. By doing so, there is no power consumption of the battery unit 2 when the working meter must be operated by an external device.

  The time constant unit 6 outputs a switch signal instead of the impact sensor 1 for a certain period of time even if the impact disappears and the switch signal from the impact sensor 1 disappears. Even if the impact sensor 1 does not receive an impact from this time constant portion, a current can be supplied from the battery portion 2 to the control portion 3 for a certain period of time. The time constant unit 6 can be constituted by, for example, a capacitor, that is, a charge can be stored in the capacitor, and the stored charge can be released when no current is supplied to be used as a switch signal.

  As long as the switch part 7 has a switching function, what kind of element may be used and there exist MOSFET and a transistor as a typical thing.

  Actually, when the working meter according to the present embodiment is used, the working meter itself is placed under strong vibrations, and there is a possibility that rock fragments that are directly crushed are scattered. Since the impact sensor 1, the battery unit 2, the control unit 3, the external interface 4 and the like are shattered when they are shattered, the outer case 8 has a high rigidity so as to protect it from shattering. Is required. The impact sensor 1, the battery unit 2, the control unit 3, the external interface 5, and the like are arranged in the exterior case 8, but the impact sensor 1 is externally applied depending on the magnitude of vibration that the working meter itself receives. Since it is necessary to generate a detection voltage upon receiving an impact, unlike the arrangement form of the battery unit 2, the control unit 3 and the external interface 5, it is arranged directly on the outer case to make it easy to receive the impact. preferable. Here, the wiring system connecting the impact sensor 1 and the control unit 3 etc. includes the impact sensor 1 that receives the impact as it is, and the control unit 3 that receives the impact that has buffered the impact as much as possible. For example, when connecting with a copper wire, not only connecting the copper wire and the impact sensor by soldering, but also covering the unsoldered portion with a resin and connecting the copper wire with the copper wire. It is preferable to make the connection with the impact sensor stronger. Even if the soldered portion is further covered with resin, a stronger connection is obtained. On the other hand, the battery unit 2, the control unit 3, and the external interface 5 do not need to receive an impact, and considering the possibility of failure, the battery unit 2, the control unit 3, and the external interface 5 are not disposed directly on the outer case 8 to avoid the impact as much as possible It is preferable to arrange the outer case 8 with a material. In addition, the cushion material is used to prevent contact between the battery unit 2, the control unit 3, and the external interface 5, and the outer case 8 and the impact sensor 1. In addition to being disposed between the impact sensor 1 and the battery unit 2, the control unit 3, and the external interface 5, a cushioning material is also provided between the battery unit 2, the control unit 3 and the external interface 5 to prevent contact between the battery unit 2, the control unit 3 and the external interface 5. It is necessary to intervene. Here, the cushioning material corresponds to a cushioning material such as foam material, and corresponds to heat generation due to vibration of each part due to impact and heat generation due to operation of the battery unit 2, the control unit 3, the impact sensor 1, and the external interface 5. A heat-resistant cushioning material is desirable. However, it is very difficult to insert such a buffer material between the battery unit 2, the control unit 3, the external interface 5, the impact sensor 1, and the outer case 8 without any gap, and it takes time even if possible. Here, it is necessary to have a buffering function and can be easily inserted into a small gap between the battery unit 2, the control unit 3, the external interface 5, the impact sensor 1 and the outer case 8, A preferred material is a resin. This resin is a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include polystyrene, HIPS, AS resin, ABS resin, styrene resin such as MBS resin, olefin resin such as polyethylene and polypropylene, polychlorinated resin. Vinyl chloride resins such as vinyl, polyester resins such as polyethylene terephthalate, polyamide resins, polyester liquid crystal polymers, urethane resins, nylon resins, epoxy resins, unsaturated polyester resins, urea resins, dicyclopentadiene A combination of a resin and a combination of these resins is applicable, and glass fibers, fillers, and other resin additives may be added to these resins. In a state where the battery unit 2 and the control unit 3 are arranged in the outer case 8, such resin is injected and filled into the outer case 8 by a dispenser, for example. The impact sensor 1 is fixed in advance to the side surface of the outer case with a double-sided tape, an adhesive, or the like so that vibration can be detected. In addition to injecting and filling with a dispenser, there is also a method of molding a resin by an injection molding method, and various methods can be applied as long as they do not affect the impact sensor 1, the battery unit 2 and the control unit 3 in the outer case 8. it can. In the case of using the thermosetting resin, the resin can be molded in the outer case 8 by using a dipping method, a transfer molding method, a casting method, or a fluidized dipping method. Further, it has been described that the impact sensor 1, the battery unit 2, the control unit 3, the external interface 5 and the like are disposed in the exterior case 8, but the exterior case 8 is provided with a plurality of partitions 81, and the battery of the battery unit 2 is provided. The control unit 3, the storage unit 4, the external interface 5, the time constant unit 6, and the switch unit 7 are disposed in the plurality of partitions 81. In addition, the control part 3, the memory | storage part 4, and the time constant part 6 are arrange | positioned at the one partition 81, and this partition 81 is a control base. The partition 81 positions the impact sensor 1, the battery unit 2, the control unit 3, the external interface 5, and the like, which are components of the working meter, at a distance from each other. If separated in this way, the separation distance is constant even when the resin is applied by a dispenser, and workability is good. However, the exterior case 8 may be provided with a partition 81, and the components of the working meter may be disposed in the provided partition 81, or before the partition 81 is provided in the exterior case 8, The component 81 may be provided in the partition 81, and the partition 81 in which the components of the working meter are provided may be provided in the exterior case 8. Similarly, the resin may be formed before the partition 81 is provided on the outer case 8 or after the partition 81 is provided on the outer case. In particular, when the partition 81 has flexibility, in addition to the buffering action by the resin, the buffering action by the flexibility of the partition 81 is also generated, and the synergistic effect makes it possible to more effectively each component. Damage can be prevented.

  This resin is applied by a dispenser or the like to form resin between the outer case 8, the battery unit 2, the control unit 3, and the storage unit 4. However, not only resin is formed between the outer case 8, the battery unit 2, the control unit 3, the storage unit 4, the time constant unit 6, and the switch unit 7, but also resin is formed on the impact sensor 1 and the external interface 5. can do. However, when the resin is formed on the impact sensor 1, for example, in order to prevent the impact sensor 1 from appropriately detecting an impact due to the buffering action of the resin, for example, the resin is not applied to the entire surface, but other resin is used. Resin is formed only on the part in contact with the part. By forming in this way, while maintaining the state in which the impact sensor 1 can detect the impact appropriately, another configuration is provided in the exterior case 8 adjacent to the impact sensor 1. Contact with the element can be prevented, and damage to the component can be prevented. Similarly, when a resin is formed on the external interface 5, for example, a portion other than the surface to be connected is prevented in order to prevent the resin from being exchanged with the outside by covering the surface to be connected to the plug 14 a. Form a resin. By forming in this way, an external device can be appropriately connected to the external interface 5 so that information can be exchanged, and other components disposed in the exterior case 8 adjacent to the external interface 5 It is possible to prevent contact with the external interface 5, and damage to the external interface 5 due to damage of components and vibration due to contact can also be prevented.

  The exterior case 8 preferably has not only excellent vibration resistance but also weather resistance, impact resistance, water resistance, wear resistance, oil resistance, etc., and this working meter is disposed in the hydraulic breaker 9. In particular, when it is used, it will be used under strong vibrations, so it uses vibration resistance, oil pressure because it uses hydraulic pressure, impact resistance because it may come into contact with rocks etc. by vibration, Since it is used outdoors, it preferably has water resistance and weather resistance. The outer case is made of a metal having such properties, specifically, a stainless material (particularly, structural stainless steel used for automobiles, aircraft, industrial machines, etc.) or an aluminum alloy. Here, the stainless material or the like is merely an example, and may be an outer case 8 made of a substance having at least one of the above properties.

  The outer case 8 has a box shape, and further has a flange portion, and a plurality of holes for fasteners are formed in the flange portion, and only the surface on which the external interface 5 is disposed is connected to the external interface. 5, a hole is formed along the shape of the external interface 5 so that the plug 14a of the external device can be connected. The holes are formed along the shape of the external interface 5 when information is exchanged by wired communication, and such holes are not necessary when wireless communication is used. However, a small hole can be formed around the position where the external interface 5 is disposed so that wireless communication can be performed more smoothly, or the thickness of the side wall of the exterior case 8 can be made thin only in the vicinity. If a hole is formed, a rubber lid that fits the shape of the hole is fitted into the hole to prevent water, oil, and dust from entering, and only when connected to the leader machine 14 The lid can be removed to expose the holes.

  After disposing the resin in the exterior case 8, a metal plate is disposed on the bottom surface of the exterior case so as to substantially cover the opening of the exterior case. By disposing such a metal plate, when the working meter is attached to the hydraulic breaker 9, the bottom surface becomes flat and the attaching operation can be performed smoothly. This metal plate may be fixed directly to the outer case 8 with screws or the like. However, as a method of easily arranging the metal plate, the metal plate is pressed into the resin immediately after the resin is not yet solidified. There is a method in which the metal plate is indented, and the metal plate is fixed in this indented state to facilitate the arrangement. However, when the opening portion of the outer case 8 and the metal plate have the same area, press fitting cannot be performed smoothly, so it is desirable to slightly reduce the area of the metal plate. In the case of a metal plate having the same area, by providing several holes in the metal plate, the resin flows out from the hole during the press-fitting to make it easy to press-fit, and the metal plate is securely fixed by the resin. This metal plate also protects each component provided in the exterior case 8.

  Next, the use operation of the working meter according to the present embodiment will be described. Before that, the hydraulic breaker 9 to which the working meter is attached and the operation of attaching the hydraulic breaker 9 will be described.

  3 and 4, the hydraulic breaker 9 includes a breaker body 91 and a bracket 92 that is sandwiched from both sides of a part of the breaker body. A chisel 91 a is formed at the tip of the breaker body 91. It is the composition which is. The hydraulic breaker 9 has a chisel 91a located on the extension of the piston, with the breaker body 91 connected to the hydraulic system via the hydraulic oil supply path, and the piston (not shown) inside is repeatedly moved up and down by the hydraulic pressure of the hydraulic oil. In the same manner, the mechanism vibrates up and down, and the rock or the like that touches the tip of the chisel 91a is crushed.

  When this working meter is attached to the hydraulic breaker 9, the working meter is attached to a position where the broken pieces do not fly as much as possible so as not to be damaged by scattering of broken pieces of rock broken by the chisel 91a. It is preferable to install after providing a mechanism for protecting from the above. As the position where the fragments do not fly, for example, a region surrounded by the breaker main body 91 and the blanket 92, particularly a position where a convex is formed in such a region and a position where it cannot be seen on the straight line from the chisel 91a is preferable. Specifically, the periphery of the fixing bolt 93 in the blanket 92 is preferable. The mechanism that protects the working meter from rock debris is a box-shaped convex part that is slightly larger than the outer shape of the working meter to prevent scattering of the rock debris, and the working meter is installed inside the convex part. Can completely protect against rock fragmentation. In addition, the working meter can be protected from rock fragments by closing the shape of the blanket 92 itself so as to protect the area surrounded by the breaker body 91 and the blanket 92. be able to. In addition, the working meter has a connection surface of the external interface 5 facing downwards to prevent water from entering the exterior case 8 from the external interface 5 when it rains. It is possible to prevent the inside of the outer case 8 from entering even when the water drops. In addition, by forming the connection portion lower than the other portions on the connection surface, it is possible to prevent water and oil from entering more, and to discharge water or oil that has entered one end by its own weight. By making a small hole in addition to the connecting part, it can serve as an air hole, and drain water and oil more smoothly. In the description of the present embodiment, it is assumed that the working meter is attached at a position that does not look straight from the chisel 91a around the fixing bolt 93. This is the end of the description of the hydraulic breaker 9 to which the working meter is attached and the operation of attaching the hydraulic breaker. Next, the operation of using the working meter will be described.

  The hydraulic breaker 9 to which the working meter is attached is joined to the tip of the hydraulic shovel 11, the hydraulic oil supply path of the hydraulic shovel 11 is connected to the hydraulic breaker 9, and the operation direction of the hydraulic breaker 9 is operated by the operation from the hydraulic shovel 11. Or the chisel 91a can be vibrated up and down.

  The hydraulic shovel 11 is moved to the work target position, the tip of the chisel 91a is moved to the crushing target rock, the hydraulic breaker 9 is operated by the operator's instruction, the chisel 91a vibrates up and down, and the crushing target rock is crushed. Is done. Due to the vertical vibration of the chisel 91, a voltage is generated by the impact sensor 1 of the working meter attached to the hydraulic breaker 9, and the detection voltage is input to the control unit 3 as an input signal, and the detection voltage is switched to the switch unit 7 as a switch signal. Is input. A switch signal is input to the switch unit 7 to be turned on, and current from the battery unit 2 is supplied to the control unit 3. As long as the impact sensor 1 receives an impact and inputs a switch signal to the switch unit 7, the current from the battery unit 2 is supplied to the control unit 3. The switch signal is input to the switch unit 7, and a part of the time constant unit 6 is stored in the time constant unit 6 by a capacitor, for example, so as to output the switch signal instead of the impact sensor 1 when the shock is lost. Thus, the charge stored in the time constant unit 6 may be taken up from the switch signal, but may be supplied from the battery unit 2 by providing a separate current supply line. The control unit 3 is activated upon receiving the supply of current from the battery unit 2, and further, since the input signal is input from the impact sensor 1, in order to determine whether or not the measurement time should be measured, a predetermined period of time is determined. It is determined whether at least one of the input signals generated from the impact sensor 1 is a detection voltage smaller than a predetermined voltage level (step 1). When it is determined in step 1 that at least one of the input signals generated from the impact sensor 1 for a certain period is not a detection voltage lower than the predetermined voltage level, the measurement time is measured (step 2). In step 1, when it is determined that at least one of the input signals generated from the impact sensor 1 for a certain period is a detection voltage lower than the predetermined voltage level, the accumulated time writing operation is performed and the process is stopped and terminated (step 3). However, when the measurement time is 0, the operation is stopped without performing the accumulated time writing operation. Next to step 2, it is determined whether or not a second predetermined period has elapsed since the previous storage operation (step 4). If it is determined in step 4 that the second predetermined period has not elapsed, the control unit 3 is shifted to the power saving mode (step 5). If it is determined in step 4 that the second predetermined period has elapsed, the accumulated time stored in the storage unit 4 is added to the measured time to be updated as the accumulated time, and the accumulated time is updated in the storage unit 4. Store (step 6).

  When the work by the hydraulic shovel 11 is completed and the usage time is checked, the accumulated time is read using the reader machine 14 (see FIG. 9) that matches the connection specifications of the external interface 5. The user connects the plug 14a of the reader device 14 to the external interface 5, pushes the power supply knob 14b upward to turn on the reader device, and presses the reading button. When the power is turned on, the lighting lamp 14c is lit. The start button 14d is pressed, current is supplied to the control unit 3, and the control unit 3 is started. When the control unit 3 is activated, the display unit 14e displays that the control unit 3 has responded and activated. When the reading button 14 f is pressed while the control unit 3 is activated, the reader 14 outputs an accumulated time reading command to the control unit 3 activated via the external interface 5. When the accumulated time read command is input, the control unit 3 determines that the input is an accumulated time read command, reads the accumulated time from the storage unit 4, and reads the accumulated time to the reader device 14 via the external interface 5. Output. The reader machine 14 displays the input accumulated time on the display unit 14e. The reader device 14 is also provided with a delete button 14g. When the delete button is pressed by the user, the reader device 14 supplies current to the control unit 3 via the external interface 5 and activates the control unit 3. The integrated time deletion command is output to the activated control unit 3. When the cumulative time deletion command is input, the control unit 3 determines that the input is a cumulative time deletion command, initializes the cumulative time in the storage unit 4, and if the initialization is normally performed, the reader unit 14 indicates that “successfully deleted” via the external interface 5. The reader device 14 displays the input “successfully deleted” on the display unit 14e. If the initialization is not performed normally, a message “deletion failed” is output to the reader device via the external interface 5. The leader machine displays the input “deletion failed” on the display unit 14e.

  Next, in order to describe the working meter in the present embodiment more specifically, the working meter will be described based on the circuit diagram of FIG. 5 and the operation flowcharts of FIGS. The controller 3, the storage unit 4, the time constant unit 6, and the switch unit 7 are mounted on one board, and the circuit shown in FIG. 5 is created. In this circuit configuration, the impact sensor 1 is connected to a microprocessor (H8 / 3664 made by Hitachi) 3a on which the control unit 3 is mounted, and at the same time, the impact sensor 1 is connected to the time constant unit 6, and the time constant unit 6 is a switch. It is connected to the gate of the MOSFET 7a which is the part 7, the lithium battery 2a which is the battery of the battery part 2 is connected to the drain of the MOSFET 7a, and the power line of the external interface 5 is connected to the source of the MOSFET 7a. The microprocessor 3 a is also connected to the time constant unit 6. The microprocessor 3a is connected to an EEPROM 4a which is a storage unit 4, and further connected to an external clock 10a to receive a clock signal. When the impact sensor 1 is connected to the microprocessor 3a and the gate of the MOSFET 7a, a voltage generated when the impact sensor 1 is impacted is applied to the microprocessor 3a as a detection voltage, and the detection voltage is similarly switched to the MOSFET 7a. Since it is applied as a signal, the MOSFET 7a as the switching element is turned on, and the current from the lithium battery is supplied to the microprocessor 3a. Therefore, a detection voltage is generated from the impact sensor 1, and current is supplied from the lithium battery 2a to the microprocessor 3a while being applied to the gate of the MOSFET 7a. Further, even if the impact disappears and the detection voltage from the impact sensor 1 is no longer applied, a voltage is applied from the time constant unit 6 for a while, and even after the impact ends, current is supplied from the lithium battery 2a to the microprocessor 3a. The The microprocessor 3a is an IC that has an MPU and a memory that perform arithmetic processing in the same manner as the general microprocessor 3a, and further includes a timer and is integrated on one chip. A power-on reset 12a is provided on the power supply line to the microprocessor 3a to ensure that the reset is applied when the power is turned on. A voltage regulator 13a is provided on the power supply line of the external interface 5 in order to obtain a constant and stable DC current.

  After a current is supplied to the microprocessor 3a and the microprocessor 3a is activated, the microprocessor 3a performs initialization operations such as declaration of various variables, initialization, memory allocation, and the like (step 100, see FIGS. 6 and 7 below). ). After step 100, the microprocessor 3a determines whether or not there is an input signal (step 101). In step 101, when the microprocessor 3a determines that there is an input signal, measurement of the measurement time variable t is started (step 101a). After step 101a, the microprocessor 3a determines whether or not the measurement time variable t indicating the measurement time is 20 [ms] or more (step 102). If the microprocessor 3a determines in step 102 that the measurement time variable t is not 20 [ms] or higher, the microprocessor 3a determines whether or not the input signal is higher than a specified voltage level (step 103). If the microprocessor 3a determines in step 103 that the input signal is equal to or higher than the specified voltage level, the microprocessor 3a determines whether there is a next input signal (step 104). If the microprocessor 3a determines in step 104 that there is a next input signal, the next input signal is set (step 105). After this step 105, the routine proceeds to step 102 again. When the microprocessor 3a determines in step 102 that the measurement time variable t indicating the measurement time is 20 [ms] or more, the measurement time variable t is set to 0 (step 106). After step 106, the microprocessor 3a determines whether or not the parameter i is 10 (step 107). If the microprocessor 3a determines in step 107 that the parameter i is 10, the microprocessor 3a proceeds to a storage operation described later (step 108). If the microprocessor 3a determines in step 107 that the parameter i is not 10, the microprocessor 3a increments the parameter i by 1 (step 109). After step 109, the microprocessor 3a shifts to a power saving mode operation described later (step 110). If the microprocessor 3a determines in step 103 that the input signal is not equal to or higher than the specified voltage level, the microprocessor 3a shifts to a storage operation described later (step 108). If the microprocessor 3a determines in step 101 that there is no input signal, the microprocessor 3a performs end operations such as initialization of various variables and memory release and stops (step 111).

  The storing operation in step 108 includes steps 108a to 108e. First, the microprocessor 3a reads the accumulated time stored from the storage unit 4 (step 108a). After this step 108a, the microprocessor 3a multiplies the reference time by the parameter i to obtain the measurement time (step 108b). After step 108b, the microprocessor 3a obtains the accumulated time by adding the measured time obtained in step 108b to the read accumulated time (step 108c). After step 108c, the microprocessor 3a writes the accumulated time obtained in step 108c into the storage unit 4 (step 108d). After step 108d, the microprocessor 3a sets the parameter i to 0 (step 108e).

  The power saving mode operation in step 110 includes steps 110a to 110c. First, the microprocessor 3a shifts to a power saving mode with low power consumption (step 110a), and after this step 110a, the microprocessor 3a determines whether there is an external interrupt in the power saving mode (step 110b). . In this step 110b, when the microprocessor 3a determines that there is no external interrupt, the microprocessor 3a proceeds to step 110b again. If the microprocessor 3a determines in step 110b that there is an external interrupt, the microprocessor 3a shifts from the power saving mode to the normal mode (step 110c). After step 110c, the process proceeds to step 101a. The external interrupt is generated every predetermined time using a timer, for example, every 1000 [ms]. As described above, if an external interrupt occurs every 1000 [ms], the fixed period for measurement is approximately 20 [ms], the fixed period for operation is also approximately 20 [ms], and the power saving mode is set. Is 980 [ms] (1000 [ms] −20 [ms]), and the storage operation is performed every 10000 [ms] (external interrupt × parametric variable i).

  In step 102, the microprocessor 3a determines whether or not the measurement time variable t indicating the measurement time is 20 [ms] or more. After 20 [ms], an external interrupt signal is sent to the control unit 3. This can also be realized by outputting a start signal to the timer at 101a using the output timer and performing the processing from step 103 to step 105 until there is an external interrupt. In addition, in order to realize the accumulated time writing operation every second predetermined period, a loop process is performed using the parameter i, but a timer that outputs an external interrupt signal to the control unit 3 after the second predetermined period is provided. Can also be realized.

  As described above, the working meter according to the present embodiment includes the impact sensor 1, the battery unit 2, the control unit 3, the storage unit 4, and the external interface 5, and uses the detection voltage from the impact sensor 1 as a switch signal. Is supplied to the control unit 3, and the control unit 3 reads the accumulated time from the storage unit 4 and adds the read accumulated time and the measurement time to write the accumulated time in the storage unit 4. When not output, the battery unit 2 does not supply current to the control unit 3, and when the switch signal is output, the battery unit 2 supplies current to the control unit 3, and the control unit 3 receives this current supply. Measure the measurement time from when the detection voltage is generated from the impact sensor 1 until the detection voltage is no longer generated, update the integration time to reflect the measurement time, and write the updated integration time to the storage unit 4 Since the current is supplied to the control unit 3 only at the time of measurement, there is no unnecessary power consumption and the power consumption is small, the battery of the battery unit 2 with a small battery capacity can be used for a long time. The battery capacity is small and the weight and size of the battery in the battery unit 2 are small. In particular, the weight of the working meter itself is light because the weight of the battery occupying most of the weight is small. It becomes small and can be operated stably for a long period of time with a low failure rate, before the components of the working meter are destroyed by the applied force. Further, since the control unit 3 operates only for a certain period every first predetermined period and is in a mode of low power consumption outside the certain period, only a current is supplied to the control unit 3 only at the time of measurement. In addition, measurement and storage are performed only for a certain period by dividing every first predetermined period, and a mode with less power consumption is performed outside the certain period, and storage is not performed, and the battery can be further reduced in weight. And stable operation for a long time with a low failure rate. Further, even if the time constant unit 6 stops generating the detection voltage from the impact sensor 1, the control unit 3 outputs the switch signal for at least the time until the integrated time is calculated and written in the storage unit 4. Even when the detection voltage from the shock sensor 1 is not generated and the control unit 3 calculates the integrated time and writes it to the storage unit 4 after the power is lost, the switch signal is output, and the detection voltage is not generated. The current is supplied from the battery unit 2 even after the switch signal is output after that, so that the control unit 3 can perform stable calculation and writing, and the accurate integration time is stored in the storage unit 4. be able to. The control unit 3 does not measure the measurement time when at least one of the detection voltages generated from the impact sensor 1 within a predetermined period is a detection voltage lower than the predetermined voltage level, so that the hydraulic pressure joined to the hydraulic shovel 11 is not measured. When the working meter is attached to the breaker 9 and the usage time is measured, the vibration is smaller than the specified voltage level, that is, less than the specified level (for example, vibration generated when the hydraulic breaker 9 is shaken during the movement of the hydraulic shovel 11) Distinguish from vibration greater than the voltage level, that is, greater than the specified level (vibration of the hydraulic breaker 9 vibrating up and down when the hydraulic breaker 9 is used for pulverization), and only vibration greater than the specified level. Can be measured, and it can be used accurately by ignoring vibrations other than using the hydraulic breaker 9 as a work. In addition to being able to measure time, it is also possible to determine whether a plurality of vibrations for a certain period of time as well as one vibration is greater than a specified level, so that the hydraulic shovel 11 can be stacked and unloaded, a hydraulic breaker can be attached, Vibrations that can be greater than the specified level caused by removal of the hydraulic breaker and the like are also excluded from the measurement target, and a more accurate use time can be measured. In addition, since the control unit 3 reads the accumulated time from the storage unit 4 every second predetermined period, and adds the read accumulated time and the measurement time to write the accumulated time in the storage unit 4. If nothing happens during the measurement, the accumulated time can be updated once and written in the storage unit 4 before the control unit 3 stops. During this time, the measurement time may be reset beyond the maximum measurement time, the memory of the control unit 3 may be cleared by vibration or heat, or current may not be temporarily supplied to the control unit 3 due to poor contact. Then, even if it operates normally again after that, the measurement time until the abnormal operation is lost, and there is a risk of storing the accumulated time with a large error in the storage unit 4, and the accumulated value is accumulated every second predetermined period. Calculate the time and obtain the memory 4 Even if the abnormal operation occurs by writing, it was written correctly up to the previous written integration time, and it recovered from the abnormal operation after writing the previous integration time and became normal operation. It is possible to reduce the influence on the accuracy of the entire usage time due to the maximum error until the time, and to maintain the correct usage time as much as possible. In addition, when the accumulated time is read out via the external interface 5, power is supplied from the outside. Therefore, an external device that easily receives power is connected to the external interface of this working meter, and integration is performed from the external device. When reading the time, an operation such as operating the control unit 3 and reading the accumulated time from the storage unit 4 is necessary. However, when such operation is performed, the power is not supplied from the battery unit but from an external device. In this working meter when connected to an external device, there is no power consumption of the battery unit 2, the battery can be reduced in weight, and a stable operation with a low failure rate can be performed for a long time.

(Other embodiments)
In the working meter according to the first embodiment, the control unit 3 sets the measurement time when at least one of the detection voltages generated from the impact sensor 1 within a certain period is a detection voltage smaller than a predetermined voltage level. Although the configuration is such that no measurement is performed, a detection voltage having a voltage level lower than the specified voltage among the detection voltages generated from the impact sensor 1 can be invalidated, and a detection voltage having a voltage level lower than the specified voltage can be invalidated. Since the battery unit 2 does not supply current to the control unit 3 without starting the switch signal and the control unit 3 does not start up, even if a vibration that is not the object of measurement occurs, even current supply is not performed. The operating time can be measured correctly with the minimum amount of power consumed by supplying current from the battery unit 2 to the control unit 3 and operating it as long as the vibration subject to Can be, it can be carried out failure rate of less long-term stable operation. Although the detection voltage having a voltage level lower than the specified voltage among the detection voltages generated from the shock sensor 1 is invalidated, the detection voltage generated from the shock sensor 1 has a voltage level lower than the first specified voltage. The detection voltage is invalidated, and the control unit 3 does not measure the measurement time when at least one of the detection voltages generated from the impact sensor 1 within a certain period is a detection voltage lower than the second predetermined voltage level, A configuration in which the first predetermined voltage level is equal to or lower than the second predetermined voltage level can also be adopted. First, the first predetermined voltage level reliably removes vibrations that are not vibrations for work from the measurement target, thereby reducing power consumption. Next, the second predetermined voltage level that is equal to or higher than the first predetermined voltage level and the determination period of a certain period are used for the work that is close to the vibration for the work. Also excluded from the measurement target vibration not moving off from the measurement object, while maintaining a more reliable operating time, it is possible to reduce power consumption, long-term low failure rate allows a stable operation.

  In the working meter according to the first embodiment, the control unit 3 writes the accumulated time in the storage unit 4, but the measurement time, the voltage level of the input signal, the user name, the rental date and time, the usage date and time, Other information such as information on the capacity of the battery unit 2 can be written in the storage unit 4. For example, it is possible to determine the optimum rental contract form by grasping the current use situation from the use date and time, and further, it can be determined that the purchase is cheaper than the rental contract. It can be determined whether or not the battery has to be replaced by reading information on the capacity of the battery unit 2. Here, information related to the capacity of the battery unit 2 is stored in the storage unit 4, but the control unit 3 checks the capacity of the battery unit 2 according to the request of the reader device and outputs the result to the reader device. You can also

  In the working meter according to the first embodiment, the external interface 5 is a wired interface. However, the external interface 5 can be a wireless interface, and further, current can be supplied wirelessly from the reader device. You can also

  In the working meter according to the first embodiment, the battery of the battery unit 2 is a primary battery. However, the battery can be a secondary battery, and can be externally connected via an external interface 5 (for example, a reader device). 14) can also be charged.

It is a circuit block diagram of the working meter which concerns on the 1st Embodiment of this invention. It is a front sectional view, a top sectional view, a side view, and a side half sectional view of the working meter according to the first embodiment of the present invention. 1 is a hydraulic breaker to which a working meter according to a first embodiment of the present invention is attached. FIG. 4 is a partially transparent view of FIG. 3. It is a circuit diagram of the working meter which concerns on the 1st Embodiment of this invention. It is an operation | movement flowchart of the working meter which concerns on the 1st Embodiment of this invention. It is an operation | movement flowchart of the working meter which concerns on the 1st Embodiment of this invention. It is a period relation figure of the working meter concerning a 1st embodiment of the present invention. It is a front view of the leader machine of the working meter concerning the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impact sensor 2 Battery part 2a Lithium battery 3 Control part 3a Microprocessor 4 Memory | storage part 4a EEPROM
5 External interface 6 Time constant part 7 Switch part 7a MOSFET
8 Exterior case 81 Partition 9 Hydraulic breaker 91 Breaker body 91a Chisel 92 Blanket 93 Fixing bolt 10a External clock 11 Hydraulic shovel 12a Power-on reset 13a Voltage regulator 14 Leader machine 14a Plug 14b Power knob 14c Lighting lamp 14d Start button 14e Display section 14e Button 14g Delete button

Claims (8)

Impact sensor that generates a detection voltage in response to an impact, a battery unit that generates a current, and a measurement from when the detection voltage is generated from the impact sensor to when the detection voltage is no longer generated by receiving the current from the battery unit A working meter having a control unit for measuring time and a storage unit for storing the measurement time and / or an integration time obtained by integrating the measurement time, wherein the control unit writes the measurement time and / or the integration time in the storage unit; ,
A working meter that supplies a current from the battery unit to the control unit while the switch signal is output, using the detected voltage from the impact sensor as a switch signal. In the working meter according to claim 1, while the switch signal is output and current is supplied from the battery unit to the control unit, the control unit performs measurement time only for a certain period every first predetermined period. A working meter that performs an operation of measuring and an operation of writing a measurement time and / or an accumulated time in a storage unit, and is in a mode of low power consumption outside the predetermined period. In the working meter according to claim 1 or 2,
A working meter comprising a time constant unit that outputs a switch signal for at least a time until the control unit calculates an accumulated time and writes it in the storage unit even when the detection voltage from the impact sensor is not generated. . In the working meter according to any one of claims 1 to 3,
The working meter, wherein the control unit does not measure a measurement time when a detection voltage generated from the impact sensor is a detection voltage having a voltage level lower than a predetermined voltage level. In the working meter according to any one of claims 1 to 3,
The working meter does not measure a measurement time when at least one of detection voltages generated from the impact sensor within a certain period is a detection voltage lower than a predetermined voltage level. In the working meter according to any one of claims 1 to 5,
A working meter that invalidates a detection voltage having a voltage level lower than a specified voltage among detection voltages generated from the impact sensor. In the working meter according to any one of claims 1 to 6,
The working meter, wherein the control unit writes the accumulated time and / or measurement time in the storage unit every second predetermined period. In the working meter according to any one of claims 1 to 7,
An external interface for reading the accumulated time and / or measurement time stored in the storage unit from the outside,
A working meter characterized in that when the accumulated time is read out via the external interface, an external power supply is received.