JP6711306B2 - Relocation detection system - Google Patents

Description

The present invention relates to a relocation detection system.

Relocation detection systems that detect unauthorized relocations to machines are known. For example, the transfer detection device disclosed in Patent Document 1 is connected to a machine tool. The relocation detection device includes a vibration detection unit. When the vibration detection unit detects the vibration of the machine tool, the relocation detection device determines that the improper relocation of the machine tool has occurred, and prohibits the machine tool from starting.

JP, 2013-120168, A

The worker may perform appropriate relocation such as layout change to the machine tool indoors, for example. In this case, the relocation detecting device detects vibrations caused by the transportation of the machine tool, and thus may erroneously detect that improper relocation has occurred. Therefore, the relocation detecting device may have difficulty in distinguishing between proper relocation of machine tools and improper relocation of machine tools.

An object of the present invention is to provide a relocation detection system in which a proper relocation to a machine is less likely to be erroneously detected as an illegal relocation.

A transfer detection system according to the present invention is a vibration detection unit that detects a vibration variable that is a variable that changes according to the degree of vibration that occurs in a machine, and a vibration detected by the vibration detection unit that causes vibration in the machine. In the transfer detection system including a vibration determining unit that determines whether or not a vibration occurs, and the vibration determining unit determines that a vibration has occurred in the machine, the movement detecting system includes a limiting unit that limits the operation of the machine. , A distance detection unit that detects a distance variable that is a variable that changes according to a distance to an object above the machine, and a reference distance that is the reference distance is acquired based on a detection result of the distance detection unit. After obtaining the reference distance by the reference distance obtaining means and the reference distance obtaining means, the distance is obtained based on the detection result of the distance detecting means, and the distance variation is the variation amount of the obtained distance with respect to the reference distance. The amount comprises a first distance determining means for determining whether or not a distance threshold is a predetermined threshold, the limiting means, the vibration determining means determines that vibration has occurred in the machine, and, When the first distance determining means determines that the distance variation amount exceeds the distance threshold, the first distance determining means is provided to limit the operation of the machine.

According to the above configuration, the relocation detection system determines the presence or absence of relocation of the machine based on the determination result by the vibration determination means and the determination result by the first distance determination means. Therefore, the relocation detection system is unlikely to erroneously detect a proper relocation of a machine as an illegal relocation.

In the relocation detection system, the vibration detection means acquires the vibration variable a plurality of times, and the vibration determination means determines whether or not vibration has occurred in the machine based on each of the plurality of vibration variables. For a plurality of times, the distance detecting means obtains the distance variable a plurality of times, the first distance determining means, based on each of the plurality of distance variables, the distance variation. Whether the amount exceeds the distance threshold is determined over the plurality of times, the limiting means, when the vibration determining means determines that vibration has occurred in the machine over a predetermined time, and the distance variation amount. If at least one of the case where the first distance judging means judges that the distance exceeds the distance threshold for the predetermined time, a second restricting means for restricting the operation of the machine may be provided. The second limiting means does not limit the operation of the machine when the vibration generated in the machine is temporary or when the distance variation exceeds the distance threshold temporarily. Therefore, the relocation detection system is more unlikely to falsely detect a proper relocation to a machine as an illegal relocation.

In the relocation detection system, the vibration determination unit temporarily determines that vibration has occurred in the machine during the predetermined time, and the distance variation amount exceeds the distance threshold value. In at least one of the case where the first distance determining means makes a temporary determination during a predetermined time, it is determined whether or not the machine is in a stable installation state in which vibration has not occurred for a specific time. The second limiting means may limit the operation of the machine when the vibration determining means determines that the machine is not in the stable installation state. If the machine is improperly relocated, it is difficult for the machine to reach a stable state. Therefore, the relocation detection system can easily detect illegal relocation to the machine.

The transfer detection system acquires the distance based on the detection result of the distance detection unit after the reference distance acquisition unit acquires the reference distance, and determines whether the acquired distance is shorter than the first distance. If the second distance determination means determines that the distance is shorter than the first distance, the vibration determination means determines that vibration has occurred in the machine. , Irrespective of the distance variation amount, third limiting means for limiting the operation of the machine is provided, and the first limiting means determines that the second distance determining means determines that the distance is not shorter than the first distance. If so, the operation of the machine may be limited. When the distance between the machine and the object is shorter than the first distance, the presence or absence of the operation restriction of the machine does not depend on the distance variation amount. Therefore, the relocation detection system can easily detect illegal relocation to the machine.

The transfer detection system includes an atmospheric pressure detection unit that detects an atmospheric pressure variable that changes according to the atmospheric pressure outside the machine, and a reference atmospheric pressure acquisition that acquires a reference atmospheric pressure that is a reference atmospheric pressure based on the detection result of the atmospheric pressure detection unit. Means and the reference atmospheric pressure acquisition means acquires the reference atmospheric pressure, the atmospheric pressure is acquired based on the detection result of the atmospheric pressure detecting means, and the atmospheric pressure fluctuation amount, which is the fluctuation amount of the acquired atmospheric pressure with respect to the reference atmospheric pressure, is predetermined. And an atmospheric pressure determination means for determining whether or not the atmospheric pressure threshold value, which is a threshold value, is exceeded, and the limiting means, when the atmospheric pressure determination means determines that the atmospheric pressure variation exceeds the atmospheric pressure threshold value, the vibration variable In the case where the atmospheric pressure determination unit determines that the atmospheric pressure variation amount does not exceed the atmospheric pressure threshold value, the fourth limiting unit limits the operation of the machine regardless of the distance variation amount. The operation of the machine may be restricted. The fourth limiting means limits the operation of the machine when the atmospheric pressure fluctuation amount exceeds the atmospheric pressure threshold value. Therefore, the relocation detection system can detect a transportation that changes the floor on which the machine is installed as an illegal relocation.

The transfer detection system acquires the distance based on the distance variable detected by the distance detection unit after the reference distance is acquired by the reference distance acquisition unit, and determines whether the acquired distance is longer than a second distance. Fifth limiting means for limiting the operation of the machine regardless of the vibration variable when the limiting means determines that the distance is longer than the second distance. The first limiting means may limit the operation of the machine when the third distance determining means determines that the distance is not longer than the second distance. The fifth limiting means limits the movement of the machine if the distance is longer than two distances. Therefore, the transfer detection system can easily detect the transportation of the machine outdoors as transfer.

The perspective view of the relocation detection system 1. The block diagram which shows the electric constitution of the transfer detection system 1. Flow chart of main processing. The front view of the machine tool 10 before conveyance. The flowchart of cancellation processing. The flow chart of relocation detection processing. Front view of the machine tool 10 on which the seat 99 is placed The flow chart following FIG. The front view of the machine tool 10 currently conveyed indoors. FIG. 3 is a front view of the machine tool 10 loaded on a truck by illegal transportation. The front view of machine tool 10 which moved outdoors by illegal transportation. The front view of the machine tool 10 which passes the door 97. The graph which shows the relationship between height position and atmospheric pressure. The flowchart which shows the modification of FIG.

An embodiment of the present invention will be described. Unless otherwise specified, the configuration, processing, etc. of the system described below are not intended to be limited thereto and are merely illustrative examples. The drawings are used for explaining the technical features that can be adopted by the present invention. In the following description, left and right, front and rear, and up and down indicated by arrows in the drawing are used.

As shown in FIG. 1, a relocation detection system 1 which is an example of an embodiment of the present invention detects unauthorized relocation of a machine tool 10. The illegal relocation of the machine tool 10 is, for example, transportation of the machine tool 10 by an illegal person who attempts to steal. Appropriate relocation of the machine tool 10 is, for example, transportation of the machine tool 10 by an operator who makes a layout change in the room. The relocation detection system 1 detects unauthorized relocation of the machine tool 10 based on the detection results of the vibration detector 33 and the distance detector 34, which will be described later.

The transfer detection system 1 includes a machine tool 10, a numerical control device 20 (see FIG. 2), and a transfer detection device 30 (see FIG. 2). The machine tool 10 is a machine that uses a tool to perform processing such as cutting on a workpiece. The numerical controller 20 controls the operation of the machine tool 10 by executing the NC program. The NC program is composed of a plurality of blocks including various control commands, and controls various operations including axis movement of the machine tool 10 and tool exchange in block units. The relocation detecting device 30 detects unauthorized relocation of the machine tool 10. The numerical control device 20 and the transfer detection device 30 can communicate with each other. When the relocation detecting device 30 detects an illegal relocation of the machine tool 10, the numerical controller 20 limits the operation of the machine tool 10. Since the machine tool 10 cannot be used, the worker requests the machine tool manufacturer to release the operation restriction. Based on a request from the operator, the machine tool manufacturer distributes a release key for releasing the operation restriction of the machine tool 10 to the operator, and the operator releases the operation restriction using the release key.

The machine tool 10 includes a base 2 and a main body 6. The base 2 is installed on the floor. The main body 6 is a box-shaped body provided on the base 2. The main body 6 houses a table, a spindle head, a tool changing device, a drive unit and the like. The table mounts the work piece. The table is movable in the X-axis direction (left-right direction) and the Y-axis direction (front-back direction). The spindle head is movable in the Z-axis direction (vertical direction) above the table. The spindle head rotatably supports the spindle. The spindle extends vertically and is equipped with a tool. The spindle can rotate integrally with the tool. The tool changing device can change the tool mounted on the spindle. The drive unit includes an X motor, a Y motor, a Z motor, a spindle motor, and a magazine motor. The X motor and Y motor move the table. The Z motor moves the spindle head. The spindle motor rotates the spindle. The magazine motor drives the tool changer. The machine tool 10 processes a workpiece with a tool by moving a rotating spindle and a table relative to each other.

The front wall portion of the main body 6 includes an opening/closing door 7, a display unit 12, and an input unit 13. The opening/closing door 7 is provided slidably. The opening/closing door 7 opens and closes the inside of the main body 6 by sliding. The display unit 12 displays various information. The display unit 12 displays various screens such as a setting screen and an operation screen. The input unit 13 is below the display unit 12. The input unit 13 is, for example, a switch, a button, a touch panel, or the like. The input unit includes a power switch (not shown), a reset key (not shown), and the like.

The electrical configuration of the numerical controller 20 will be described with reference to FIG. The numerical control device 20 includes a CPU 21, a ROM 22, a RAM 23, a storage device 24, a mechanical I/F unit 25, an AC/DC converter 26, a transfer I/F unit 27, and the like. The CPU 21 centrally controls the operation of the numerical controller 20. The RAM 23 temporarily stores various information. The ROM 22 stores a main processing program, a cancellation processing program, and the like. The processing based on each program will be described later. Each program may be stored in a non-volatile storage device as a computer-readable storage medium, an EEPROM (registered trademark), an HDD (hard disk drive), or the like. The RAM 23 temporarily stores various information. The storage device 24 is nonvolatile and stores various information in addition to the NC program. In addition to the NC program input by the operator via the input unit 13, the CPU 21 can also store the NC program or the like read by external input in the storage device 24.

The machine I/F unit 25 is connected to each of the drive unit, the display unit 12, and the input unit 13 of the machine tool 10. The CPU 21 drives and controls the drive unit via the machine I/F unit 25 to control the machining operation of the machine tool 10. The CPU 21 displays various information on the display unit 12 via the mechanical I/F unit 25. The CPU 21 receives various kinds of information input to the input unit 13 via the mechanical I/F unit 25. The AC/DC converter 26 is connected to an AC power supply 28 provided outside the transfer detection system 1 and converts AC power supplied by the AC power supply 28 into DC power. The AC/DC converter 26 is connected to an AC power supply 28 and also to an I/F unit 38 of the transfer detection device 30 described later.

The electrical configuration of the relocation detection device 30 will be described. The relocation detection device 30 includes a CPU 31, a storage device 32, a vibration detector 33, a distance detector 34, an atmospheric pressure detector 35, a timer 39, a mounting section 40, an I/F section 38, and the like. The CPU 31 centrally controls the operation of the transfer detection device 30. The storage device 32 is non-volatile. The storage device 32 stores a transfer flag, a transfer detection processing program, and the like. When the relocation detection system 1 detects an illegal relocation of the machine tool 10, the relocation flag becomes 1. When the relocation detection system 1 does not detect an illegal relocation of the machine tool 10, the relocation flag becomes 0. The vibration detector 33 detects a vibration variable of the machine tool 10. The vibration variable is a variable that changes according to the degree of vibration generated in the machine tool 10. In this embodiment, the vibration detector 33 is an acceleration sensor, and the vibration variable is the acceleration of the machine tool 10. The distance detector 34 detects a distance variable. The distance variable is a variable that changes according to an upper distance that is a distance between the machine tool 10 and an object above the machine tool 10. In the present embodiment, the distance detector 34 is an optical sensor, and the distance variable is the time from when the distance detector 34 emits light upward until the light reflected by the object enters the distance detector 34. Is. When the machine tool 10 is normally installed indoors, the object above the machine tool 10 is the ceiling 98 (see FIG. 4, etc.). The atmospheric pressure detector 35 detects an atmospheric pressure variable. The atmospheric pressure variable is a variable that changes according to the atmospheric pressure outside the machine tool 10. In the present embodiment, the atmospheric pressure detector 35 is a capacitance type sensor, and the atmospheric pressure variable is electrostatic capacitance. The mounting portion 40 mounts the battery 41.

The I/F unit 38 is connected to the transfer I/F unit 27 of the numerical controller 20 and the AC/DC converter 26, respectively. When the power switch of the input unit 13 of the machine tool 10 is on, the AC/DC converter 26 supplies a part of the power converted from AC to DC to the I/F unit 38. In this case, the relocation detecting device 30 operates by the power supplied by the AC/DC converter 26. When the power switch of the input unit 13 is switched from ON to OFF, the AC/DC converter 26 cuts off the power supply to the I/F unit 38. In this case, the transfer detection device 30 operates by the power supplied by the battery 41.

The main process will be described with reference to FIGS. 3 and 4. When the power switch is turned on, the CPU 21 reads the main processing program from the ROM 22 and executes this processing. The CPU 21 determines whether the transfer flag is 0 (S1). For example, the CPU 21 transmits a confirmation signal to the CPU 31 and waits until receiving a response signal from the CPU 31. Upon receiving the confirmation signal, the CPU 31 refers to the storage device 32 and determines whether the transfer flag is 0 or not. The CPU 31 transmits the determination result as a response signal to the CPU 21. The CPU 21 determines whether the transfer flag is 0 based on the received response signal. When the relocation flag is 0 (S1: NO), the CPU 21 executes the processing process (S3). The CPU 21 reads the NC program and drives and controls the drive unit of the machine tool 10 according to the read NC program. The machine tool 10 processes the workpiece (S3).

The CPU 21 transmits to the CPU 31 an instruction signal for acquiring a reference distance which is a reference upper distance (S5). For example, the CPU 21 waits until it receives a response signal from the CPU 31 after transmitting the instruction signal. Upon receiving the instruction signal, the CPU 31 acquires the reference distance based on the detection result of the distance detector 34. The CPU 31 stores the acquired reference distance in the storage device 32, and transmits the completion of storage in the storage device 32 to the CPU 21 as a response signal (S5). When the machine tool 10 is normally installed indoors, the reference distance is the distance between the machine tool 10 and the ceiling 98, and corresponds to the dimension L1. The CPU 21, which has received the response signal, turns off the power of the machine tool 10 and ends the main processing.

When the relocation flag is 1 (S1: YES), the CPU 21 executes operation restriction of the machine tool 10 (S7). For example, the CPU 21 executes the start/stop of the machine tool 10, the drive control of the drive unit of the machine tool 10, the reception of various instructions input via the input unit 13, and the like (S7). The CPU 21 turns off the power of the machine tool 10 and ends the main processing. The transfer detection process (see FIGS. 6 and 8) in which the transfer flag is overwritten with 1 will be described later.

The cancellation process will be described with reference to FIG. When the CPU 21 limits the operation of the machine tool 10 in the main process (see FIG. 3) (S7), the machine tool 10 stops the operation. The operator cannot use the machine tool 10. The worker requests the machine tool manufacturer to release the operation restriction. The machine tool manufacturer notifies the operator of the release key required for the release operation. For example, after the power of the machine tool 10 is turned on, the operator inputs the release key into the input unit 13 to perform the release operation. When the CPU 21 receives the input of the release key, it reads the release processing program from the ROM 22 and executes this processing. The CPU 21 releases the operation restriction of the machine tool 10 (S11). The CPU 21 initializes the transfer flag to 0 (S13). For example, the CPU 21 transmits an instruction signal indicating an instruction to overwrite the transfer flag stored in the storage device 32 to 0, and waits until a response signal from the CPU 31 is received. Upon receiving the instruction signal, the CPU 31 overwrites the transfer flag stored in the storage device 32 from 1 to 0, and sends a signal indicating completion of overwriting to the CPU 21 as a response signal (S13). The CPU 21 ends the cancellation process.

The transfer detection process will be described with reference to FIGS. 6 to 13. The move detection process is a process in which the CPU 31 determines whether or not the machine tool 10 has been moved illegally. After executing the main process, the power of the machine tool 10 is turned off. The CPU 31 uses the power of the battery 41 to execute the relocation detection process every predetermined period. The transfer flag is 0 before the transfer detection process is started. The CPU 31 reads the transfer detection processing program stored in the storage device 32 and executes this processing.

The CPU 31 refers to the storage device 32 and determines whether the transfer flag is 1 (S21). When the relocation flag is 0 (S21: NO), the CPU 31 determines whether the power of the machine tool 10 has been turned on (S23). The CPU 31 determines whether or not the power of the machine tool 10 is turned on by determining whether or not power is supplied from the AC/DC converter 26 (see FIG. 2). When the power of the machine tool 10 is turned on (S23: YES), the CPU 31 ends the transfer detection process. After the completion of the transfer detection process, the CPU 21 of the numerical control device 20 executes the main process described above.

The CPU 31 determines whether the upward distance has changed from the reference distance (S25). The CPU 31 acquires the upper distance based on the detection result of the distance detector 34. The CPU 31 compares the acquired upper distance with the reference distance stored in the storage device 32 to determine whether the upper distance has changed from the reference distance (S25). When the upper distance has not changed from the reference distance (S25: NO), the CPU 31 shifts the processing to S23. When the upper distance has changed (S25: YES), the CPU 31 determines whether the upper distance acquired in S25 is shorter than the first distance (S27). The first distance is a predetermined threshold value that serves as a criterion for determining whether or not an object is placed above the machine tool 10. The first distance is 0.1 m as an example.

For example, after the main processing (see FIG. 3) is completed, an operator may cover the machine tool 10 that has stopped operating with a sheet 99 (see FIG. 7). The sheet 99 is placed on the machine tool 10. The upward distance in this case corresponds to the dimension L2 (see FIG. 7). The upper distance changes from the reference distance (S25:YES) and is shorter than the first distance (S27:YES).

The CPU 21 determines whether vibration has occurred in the machine tool 10 (S29). For example, the CPU 21 acquires the acceleration based on the detection result of the vibration detector 33, and determines whether the acquired acceleration exceeds an acceleration threshold that is a predetermined threshold (S29). When the acquired acceleration is less than or equal to the acceleration threshold, the CPU 31 determines that the machine tool 10 is not vibrating (S29: NO), and ends the transfer detection process. When the acceleration exceeds the acceleration threshold, the CPU 31 determines that vibration has occurred in the machine tool 10 (S29: YES). The CPU 31 overwrites the transfer flag stored in the storage device 32 with 1 (S31), and ends the transfer detection process. For example, when the machine tool 10 covered with the sheet 99 (see FIG. 7) is transported, the acceleration generated by the machine tool 10 exceeds the acceleration threshold value (S29: YES). Since the transfer flag stored in the storage device 32 is overwritten from 0 to 1 (S31), the CPU 21 executes the operation restriction of the machine tool 10 in the above-described main processing (see FIG. 3) (S7).

When the upper distance is equal to or greater than the first distance (S27: NO), the CPU 31 acquires the reference atmospheric pressure which is the reference atmospheric pressure (S33). The CPU 31 acquires the reference atmospheric pressure based on the detection result of the atmospheric pressure detector 35, and stores the acquired reference atmospheric pressure in the storage device 32 (S33).

As shown in FIGS. 8 and 13, the CPU 31 determines whether or not the atmospheric pressure fluctuation amount exceeds the atmospheric pressure threshold value (S35). The atmospheric pressure fluctuation amount is a fluctuation amount of the atmospheric pressure with respect to the reference atmospheric pressure. The atmospheric pressure threshold value is a predetermined threshold value that serves as a determination reference when determining whether the machine tool 10 indoors is transported to a floor different from the floor before transportation. The graph of FIG. 13 shows the result of measuring atmospheric pressure at a plurality of height positions in a 4-story building. Patterns A to D show different measurement dates. The higher the floor of the building, the lower the pressure tends to be. Therefore, the relocation detection system 1 can detect relocation of the machine tool 10 to a different floor in the room by the atmospheric pressure threshold value. The CPU 31 acquires the atmospheric pressure based on the detection result of the atmospheric pressure detector 35. The CPU 31 determines whether or not the atmospheric pressure variation amount of the acquired atmospheric pressure with respect to the reference atmospheric pressure exceeds the atmospheric pressure threshold value (S35). When determining that the atmospheric pressure fluctuation amount exceeds the atmospheric pressure threshold value (S35: YES), the CPU 31 overwrites the transfer flag with 1 (S31), and ends the transfer detection process.

For example, when the worker carries the machine tool 10 for the purpose of changing the indoor layout, the upper distance changes within the range of the first distance or more (S25:YES, S27:YES). The floor on which the machine tool 10 is located when the reference pressure is acquired matches the floor on which the machine tool 10 is located at the start of transportation (S33). If the floor where the machine tool 10 is at the time of obtaining the atmospheric pressure variation is different from the floor where the machine tool 10 is at the start of transportation, the atmospheric pressure variation exceeds the atmospheric pressure threshold value (S35: YES). The CPU 31 overwrites the transfer flag of the storage device 32 with 1 (S31). That is, in the transfer detection system 1 of the present embodiment, when the worker carries the machine tool 10 to another floor for the purpose of changing the indoor layout, the CPU 21 executes the operation restriction of the machine tool 10 (S7).

When the atmospheric pressure variation is less than or equal to the atmospheric pressure threshold (S35: NO), the CPU 31 determines whether the distance variation is larger than the distance threshold (S37). The distance variation amount is a variation amount of the upper distance detected by the distance detector 34 with respect to the reference distance. The distance threshold is a predetermined threshold that serves as a criterion for determining whether or not the machine tool 10 passes a place where the ceiling height is relatively low or relatively high. The distance threshold is larger than the first distance. The CPU 31 acquires the upper distance based on the detection result of the distance detector 34. The CPU 31 determines whether or not the variation amount of the acquired upper distance with respect to the reference distance exceeds the distance threshold value (S37). When the distance variation amount is less than or equal to the distance threshold value (S37: NO), the CPU 31 determines whether or not vibration is detected based on the detection result of the vibration detector 33 (S39). S39 is the same process as S29 (see FIG. 6). When determining that the vibration is detected (S39: YES), the CPU 31 shifts the processing to S35. When determining that the vibration is not detected (S39: NO), the CPU 31 shifts the processing to S41.

For example, as shown in FIG. 9, an operator who changes the layout carries the machine tool 10 with a forklift within a range in which the height to the ceiling 98 is substantially constant. The atmospheric pressure fluctuation amount does not exceed the threshold value (S35: NO). The upper distance (dimension L3) is smaller than the reference distance (dimension L1 in FIG. 4) before the start of transportation of the machine tool 10. The distance variation amount does not exceed the distance threshold (S37: NO). The CPU 31 detects the vibration generated in the machine tool 10 as the forklift is transported (S39: YES). While the machine tool 10 is being transported, the CPU 31 executes S35 to S39. When the transportation of the machine tool 10 is completed, the vibration generated in the machine tool 10 disappears and the CPU 31 no longer detects the vibration of the machine tool 10 (S39: NO), and the process proceeds to S41.

As shown in FIGS. 8 and 10, the CPU 31 determines whether the machine tool 10 is in a stable installation state (S41). The stable installation state is a state of the machine tool 10 in which vibration does not occur for a specific time. The specific time is, for example, 24 hours. For example, the CPU 31 starts counting the time of the timer 39. The vibration detector 33 detects the acceleration a plurality of times at a predetermined cycle until the timer 39 measures the specific time. Each time the vibration detector 33 detects the acceleration, the CPU 31 determines whether the acceleration exceeds the acceleration threshold value. When the acceleration is equal to or lower than the acceleration threshold over the specific time, the CPU 31 determines that the machine tool 10 is in a stable installation state (S41: YES). For example, after the machine tool 10 is transported due to the layout change, the machine tool 10 is installed in another place. Vibration does not occur in the machine tool 10 for a predetermined time, and the machine tool 10 is in a stable installation state (S41: YES). Therefore, the relocation detection system 1 does not detect the transportation of the machine tool 10 by the worker as an illegal relocation. At the end of S41, the CPU 31 ends the counting of the timer 39.

When determining that the machine tool 10 is not in the stable installation state (S41: NO), the CPU 31 overwrites the transfer flag with 1 (S31) and ends the transfer detection process. For example, as shown in FIG. 10, an illegal person may carry the machine tool 10 by a forklift and load the machine tool 10 on a truck indoors. When the height from the machine tool 10 to the ceiling of the truck bed is close to the dimension L1 (see FIG. 4), the distance variation amount is less than or equal to the distance threshold value (S37: NO). After the illicit person loads the machine tool 10 on the truck, the vibration disappears from the machine tool 10 (S39: NO). However, since the vibration reoccurs in the machine tool 10 as the truck travels, the machine tool 10 is not in a stable installation state (S41: NO). Therefore, since the CPU 31 overwrites the transfer flag with 1 (S31), the transfer detection system 1 can detect the illegal transfer of the machine tool 10.

As shown in FIG. 8, when the distance variation amount exceeds the distance threshold value (S37: YES), the CPU 31 starts the timer 39 to count time (S45). The CPU 31 acquires the upper distance based on the detection result of the distance detector 34 (S47). The CPU 31 determines whether or not the upper distance acquired in S47 exceeds the second distance (S49). The second distance is a predetermined reference that is a criterion for determining whether or not the machine tool 10 is transported outdoors. Is the threshold value of. The second distance is greater than the first distance. The second distance is 50 m as an example. When the upper distance exceeds the second distance (S49: YES), the CPU 31 shifts the processing to S31.

For example, as shown in FIG. 11, when an illegal person carries the machine tool 10 outdoors, the distance variation amount exceeds the distance threshold value (S37: YES) and the upper distance (dimension L4) exceeds the second distance (S49: Yes). Since the CPU 31 overwrites the transfer flag with 1 (S31), the transfer detection system 1 can detect an illegal transfer. If there is no object above the machine tool 10 outdoors, the distance variable cannot be measured. The distance detector 34 outputs a detection result indicating that measurement is impossible to the CPU 31, and the CPU 31 determines that the distance variable exceeds the second distance (S49: YES).

As shown in FIG. 8, when the upper distance is equal to or less than the second distance (S49: NO), the CPU 31 determines whether the distance variation amount exceeds the distance threshold value (S51). The CPU 31 acquires a distance variable based on the detection result of the distance detector 34. The CPU 31 determines whether or not the distance variation amount of the acquired distance variable exceeds the distance threshold value. When the distance variation amount exceeds the distance threshold value (S51: YES), the CPU 31 determines whether or not a predetermined time has elapsed based on the time measurement result of the timer 39 (S53). The predetermined time period is a predetermined threshold value that serves as a determination reference when determining whether an illegal transfer has occurred. The predetermined time is, for example, 15 minutes. The CPU 31 repeatedly executes S47 to S53 until a predetermined time elapses (S53: NO). When the CPU 31 determines that the distance variation amount is equal to or less than the distance threshold value (S51: NO), the time counting of the timer 39 is ended (S55), and the process proceeds to S39.

For example, as shown in FIG. 12, the worker carries the machine tool 10 to another room on the same floor indoors as the indoor layout is changed. In this case, the machine tool 10 temporarily passes through the door 97. The upper distance (dimension L3) when the door 97 passes is smaller than the reference distance (dimension L1 in FIG. 4), and the distance variation temporarily exceeds the distance threshold (S37:YES, S51:YES). After the machine tool 10 passes through the door 97, the distance variation amount becomes equal to or less than the distance threshold value (S53:NO, S51:NO), and the CPU 21 ends the time counting (S55). The CPU 31 executes S35 to S39 until the installation of the machine tool 10 moved to another room is completed (S39: YES).

As shown in FIG. 8, when the predetermined time has elapsed (S53: YES), the CPU 31 shifts the processing to S31. For example, an illegal person may load the machine tool 10 on a truck indoors. If the ceiling height of the truck bed is low, the distance variation amount exceeds the distance threshold for a predetermined time or longer (S51:YES, S53:YES). Since the CPU 31 overwrites the transfer flag with 1 (S31), the transfer detection system 1 can detect the illegal transfer of the machine tool 10.

In the above description, the machine tool 10 is an example of the machine of the present invention. The vibration detector 33 is an example of the vibration detecting means of the present invention. The distance detector 34 is an example of the distance detecting means of the present invention. The atmospheric pressure detector 35 is an example of the atmospheric pressure detecting means of the present invention. The CPU 31 that executes S41 is an example of the vibration determination means of the present invention. The CPU 21 that executes S7 is an example of the limiting means of the present invention. The CPU 31 that acquires the reference distance in S5 is an example of the reference distance acquisition unit of the present invention. CPU21 which performs S7 after performing S51:NO and S41:NO is an example of the first limiting means of the present invention. After executing S53: YES, the CPU 21 that executes S7 is an example of the second limiting means of the present invention. After executing 29: NO, the CPU 21 that executes S7 is an example of the third limiting means of the present invention. After executing S35:YES, the CPU 21 that executes S7 is an example of the fourth limiting means of the present invention. S49: After executing YES, the CPU 21 that executes S7 is an example of the fifth limiting means of the present invention. The CPU 31 that executes S33 is an example of the reference atmospheric pressure acquisition means of the present invention. CPU31 which performs S35 is an example of the atmospheric pressure determination means of this invention. CPU31 which performs S27 is an example of the 2nd distance judging means of the present invention. The CPU 31 that executes S49 is an example of the third distance determining means of the present invention.

As described above, when the distance variation temporarily exceeds the distance threshold value (S37:YES, S51:NO) and the vibration occurs in the machine (S41:NO), the CPU 31 sets the transfer flag to 1 ( (S31), the CPU 21 executes operation restriction of the machine tool 10 (S7). For example, an operator may carry the machine tool 10 on the same floor indoors for the purpose of changing the layout. In this case, the distance variation amount tends not to exceed the distance threshold during the transportation of the machine tool 10 (S37: NO), and the vibration disappears after the transportation of the machine tool 10 (S39: NO). Since the vibration does not recur in the machine tool 10 after transportation (S41: YES), the CPU 31 does not set the transfer flag to 1. Therefore, the CPU 21 does not execute the operation restriction (S7) even if the vibration occurs in the machine tool 10 due to the proper relocation of the machine tool 10. Therefore, the relocation detection system 1 is unlikely to erroneously detect a proper relocation to the machine tool 10 as an illegal relocation. The CPU 31 reacquires the reference distance based on the detection result of the distance detector 34 (S43), and moves the process to S23. Therefore, after the proper relocation of the machine tool 10, the CPU 31 can continue to detect the illegal relocation of the machine tool 10.

When the distance variation amount exceeds the distance threshold value for a predetermined time (S51: YES, S53; YES), the CPU 21 limits the operation of the machine tool 10 (S7). When the machine tool 10 passes through the door 97 due to the layout change, for example, the distance variation amount temporarily exceeds the distance threshold within a period shorter than the predetermined time. Since the distance variation amount returns to the distance threshold value or less by the lapse of a predetermined time (S53: NO, S51: NO), the CPU 21 does not limit the operation of the machine tool 10. Therefore, the relocation detection system 1 is unlikely to erroneously detect a proper relocation for the machine tool 10 as an improper relocation.

When the machine tool 10 is not in the stable installation state (S41: NO), the CPU 21 executes the operation restriction of the machine tool 10 (S7). For example, there is a case where an illegal person carries the machine tool 10 outdoors and loads it on a truck, and the ceiling height of the bed of the truck is almost equal to the ceiling height indoors. In this case, the distance change amount temporarily becomes less than the distance threshold value (S37: YES) after exceeding the distance threshold value as it is carried out outdoors (S37: YES). After the machine tool 10 is loaded on the truck, the vibrations disappear temporarily from the machine tool 10 (S39: NO). However, since the vibration reoccurs in the machine tool 10 as the truck travels, the machine tool 10 does not enter the stable installation state (S41: NO), and the CPU 31 sets the transfer flag to 1 (S31). Therefore, the relocation detection system 1 can easily detect an illegal relocation to the machine tool 10.

For example, when an illegal person carries the machine tool 10 on which the sheet 99 is placed, the upper distance is constant (dimension L2 in FIG. 7). In this case, since the upper distance is shorter than the first distance (S27:YES), when vibration is generated in the machine tool 10 (S29:YES), the CPU 31 limits the operation of the machine tool 10 regardless of the distance variation amount. Execute (S7). When the upper distance is shorter than the first distance, the presence or absence of the operation restriction of the machine tool 10 does not depend on the upper distance. Therefore, the transfer detection system 1 can easily detect the transportation of the machine tool 10 by an unauthorized person as an unauthorized transfer to the machine tool 10.

When the atmospheric pressure fluctuation amount exceeds the atmospheric pressure threshold value (S35: YES), the CPU 31 sets the transfer flag to 1 regardless of the distance fluctuation amount and the acceleration (S31), and the CPU 21 executes the operation restriction of the machine tool 10 (S7). ). Therefore, the relocation detection system 1 can execute the operation restriction of the machine tool 10 when the transportation for changing the floor on which the machine tool 10 is installed occurs.

When the upper distance exceeds the second distance (S49: YES), the CPU 21 executes operation restriction on the machine tool 10 (S7). Therefore, the relocation detection system 1 can easily detect the transportation of the machine tool 10 outdoors as an illegal relocation.

The present invention is not limited to the above embodiment. The relocation detection system 1 may detect unauthorized relocation of a machine of a type different from the machine tool 10. Although the relocation detecting device 30 of the above-described embodiment is attached to the machine tool 10, for example, only the vibration detector 33 may be attached to the machine tool 10.

The vibration detector 33 may detect, for example, the frequency of the machine tool 10 or the degree of inclination of the machine tool 10 instead of detecting the acceleration of the machine tool 10 as a vibration variable. The distance detector 34 may be, for example, an ultrasonic sensor instead of the optical sensor. The distance variable is the time from when the distance detector 34 emits a sound wave upward until it receives the emitted sound wave. The atmospheric pressure detector 35 may be, for example, a vibration type barometer. In this case, the atmospheric pressure variable is the resonance frequency.

A modified example of the transfer detection process will be described with reference to FIG. In the present modified example, the same step number is assigned to the relocation detection process similar to that of the above-described embodiment, and the description thereof will be omitted. The CPU 31 of this modification executes S21 to S33 (see FIG. 6 and FIG. 8) as in the above embodiment. The CPU 31 of this modification does not execute S49 (see FIG. 8).

After obtaining the upper distance (S47), the CPU 31 obtains the acceleration based on the detection result of the vibration detector 33 (S71). The CPU 31 determines whether the machine tool 10 is in the first state. When the machine tool 10 is in the first state, at least one of the first condition in which the distance variation exceeds the distance threshold and the second condition in which the acceleration exceeds the acceleration threshold is satisfied. The CPU 31 determines whether or not at least one of the first condition and the second condition is satisfied, based on the upper distance acquired in S47 and the acceleration acquired in S71 (S73). When the machine tool 10 is in the first state (S73: YES), the CPU 31 shifts the processing to S53. When the machine tool 10 is not in the first state (S73: NO), the CPU 31 shifts the processing to S55.

For example, when the machine tool 10 passes through the door 97 (see FIG. 12) due to the indoor layout change, the distance variation amount exceeds the distance threshold value (S37: YES). The machine tool 10 is in the first state (S73: YES). The transportation of the machine tool 10 is completed within a predetermined time. The vibration disappears from the machine tool 10, and the distance variation amount becomes equal to or less than the distance threshold. Therefore, by the elapse of a predetermined time (S53: NO), the CPU 31 determines that the machine tool 10 is not in the first state (S73: NO) and does not overwrite the transfer flag with 1. Therefore, even if the machine tool 10 is temporarily in the first state, the transfer detection system 1 does not execute the operation restriction of the machine tool 10. Therefore, the relocation detection system 1 is unlikely to erroneously detect a proper relocation to the machine tool 10 as an illegal relocation.

If the machine tool 10 is in the first state for a predetermined time, it is highly possible that an illegal relocation has been performed. For example, the machine tool 10 that has passed through the door 97 may be loaded on a truck. In this case, if the truck starts traveling immediately after loading, vibration continuously occurs in the machine tool 10. The CPU 31 determines that the vibration has occurred in the machine a plurality of times over a predetermined time (S73:YES, S53:NO). In addition, if the ceiling of the truck bed is relatively low, the distance fluctuation amount continuously exceeds the distance threshold. The CPU 31 determines that the distance variation amount exceeds the distance a plurality of times over a predetermined time (S73:YES, S53:NO). Therefore, the relocation detection system 1 can easily detect an illegal relocation of the machine tool 10.

In this modification, the CPU 31 that executes S73 is an example of the first determination unit and the first distance determination unit of the present invention. In this modification, the CPU 31 does not have to execute S47. In this case, the CPU 31 that executes S73 may determine whether or not vibration has occurred in the machine tool 10, instead of determining whether or not the machine tool 10 is in the first state. Even in this case, the relocation detection system 1 is unlikely to erroneously detect a proper relocation to the machine tool 10 as an illegal relocation.

The operation restriction process and the cancellation process of the above-described embodiment may be executed by the CPU 31 instead of the CPU 21, or may be executed by an electronic component such as AISC. Similarly, the transfer detection process may be executed by the CPU 21 instead of being executed by the CPU 31, or may be executed by an electronic component such as AISC.

1 Relocation detection system 10 Machine tools 21, 31 CPU
33 vibration detector 34 distance detector 35 atmospheric pressure detector

Claims (6)

Vibration detection means for detecting a vibration variable, which is a variable that changes according to the degree of vibration occurring in the machine,
Based on the vibration variable detected by the vibration detection means, a vibration determination means for determining whether or not vibration has occurred in the machine,
When the vibration determination means determines that vibration has occurred in the machine, a movement detection system including a limiting means for limiting the operation of the machine,
Distance detection means for detecting a distance variable that is a variable that changes according to the distance between the machine and an object above the machine,
A reference distance acquisition unit that acquires a reference distance that is the reference distance based on the detection result of the distance detection unit;
After obtaining the reference distance by the reference distance obtaining means, the distance is obtained based on the detection result of the distance detecting means, and the distance variation amount that is the variation amount of the obtained distance with respect to the reference distance is a predetermined threshold value. A first distance determining means for determining whether or not a certain distance threshold is exceeded,
The limiting means limits the operation of the machine when the vibration determining means determines that vibration has occurred in the machine and the first distance determining means determines that the distance variation amount exceeds the distance threshold. A relocation detecting system, comprising: The vibration detection means acquires the vibration variable over a plurality of times,
The vibration determining means, based on each of the plurality of vibration variables, determines whether or not vibration has occurred in the machine over the plurality of times,
The distance detection means acquires the distance variable over a plurality of times,
The first distance determination means, based on each of the plurality of distance variables, determines whether or not the distance variation amount exceeds the distance threshold value over the plurality of times,
When the vibration determining means determines that vibration has occurred in the machine over a predetermined time, and when the distance variation amount exceeds the distance threshold, the limiting means determines that the first distance determining means continues for the predetermined time. The relocation detection system according to claim 1, further comprising a second limiting unit that limits the operation of the machine in at least one of the case of the above determination. The vibration determination means, when the vibration determination means temporarily determines that vibration has occurred in the machine during the predetermined time, and when the distance variation amount exceeds the distance threshold, during the predetermined time In at least one of the case where the first distance determining means temporarily determines, it is determined whether or not the machine is in a stable installation state in which vibration is not occurring for a specific time.
The transfer detection system according to claim 2, wherein the second limiting unit limits the operation of the machine when the vibration determining unit determines that the machine is not in the stable installation state. Second distance determining means for determining whether or not the acquired distance is shorter than the first distance after acquiring the reference distance by the reference distance acquiring means, based on the detection result of the distance detecting means Equipped with
The limiting means, when the second distance determining means determines that the distance is shorter than the first distance, when the vibration determining means determines that vibration has occurred in the machine, regardless of the distance variation amount, A third limiting means for limiting the operation of the machine,
The first limiting means limits the operation of the machine when the second distance determining means determines that the distance is not shorter than the first distance. Relocation detection system described in one. Atmospheric pressure detection means for detecting an atmospheric pressure variable that changes with the atmospheric pressure outside the machine,
A reference atmospheric pressure acquisition unit that acquires a reference atmospheric pressure that is a reference atmospheric pressure based on the detection result of the atmospheric pressure detection unit;
After the reference atmospheric pressure is acquired by the reference atmospheric pressure acquisition unit, the atmospheric pressure is acquired based on the detection result of the atmospheric pressure detection unit, and the atmospheric pressure fluctuation amount that is the amount of fluctuation of the acquired atmospheric pressure with respect to the reference atmospheric pressure is a predetermined threshold value. An atmospheric pressure determination means for determining whether or not a certain atmospheric pressure threshold is exceeded,
When the atmospheric pressure determination unit determines that the atmospheric pressure fluctuation amount exceeds the atmospheric pressure threshold value, the restriction unit includes a fourth restriction unit that restricts the operation of the machine regardless of the vibration variable and the distance fluctuation amount. ,
5. The first limiting means limits the operation of the machine when the atmospheric pressure determining means determines that the atmospheric pressure fluctuation amount does not exceed the atmospheric pressure threshold value. Relocation detection system After acquiring the reference distance by the reference distance acquisition means, the distance is acquired based on the distance variable detected by the distance detection means, and it is determined whether or not the acquired distance is longer than a second distance. Equipped with distance determination means,
The limiting means, when it is determined that the distance is longer than the second distance, regardless of the vibration variable, a fifth limiting means for limiting the operation of the machine,
The first limiting means limits the operation of the machine when the third distance determining means determines that the distance is not longer than the second distance. Relocation detection system described in one.

Images