JP7409237B2 - Relocation detection system and control method - Google Patents

Description

The present invention relates to a relocation detection system and a control method.

The relocation detection device described in Patent Document 1 includes a battery and a vibration detector. The relocation detection device operates with power supplied from a battery. The relocation detection device determines that the machine tool has been relocated when the vibration detector detects vibration. The relocation detection device limits the operation of the machine tool when it detects relocation of the machine tool or when it detects a dead battery. When the relocation detection device detects the relocation of a machine tool, it pops up a relocation warning screen. The relocation detection device also pops up a voltage warning screen when it detects a drop in battery voltage. If the relocation of the machine tool and the drop in battery voltage are detected at the same time, the relocation detection device may restrict the operation of the machine tool again due to battery exhaustion after the restriction on the operation of the machine tool is lifted. Therefore, when the relocation detection device detects the relocation of a machine tool and a drop in battery voltage at the same time, it pops up a voltage warning screen with priority over the relocation warning screen.

JP2017-215645A

Even if the above-mentioned relocation detection device detects the relocation of the machine tool and the drop in battery voltage at the same time and displays the voltage warning screen as a pop-up with priority, the operator may ignore the voltage warning display and continue to operate the machine tool. Operation restrictions may be lifted. In this case, the relocation detection device cannot solve the problem of restricting the operation again due to a dead battery after the operation restriction is canceled.

An object of the present invention is to provide a relocation detection system and a control method that can avoid lifting restrictions on the operation of a machine in a state where the battery voltage has decreased, when relocation of a machine and a decrease in battery voltage occur simultaneously. That's true.

The relocation detection system according to claim 1 includes a relocation determination section that determines relocation of the machine based on output information of a relocation detection section capable of detecting relocation of the machine, and a relocation determination section that determines whether the relocation detection section has run out of battery that supplies power to the relocation detection section. a dead battery determination unit that determines whether or not the battery has run out, and a restriction that limits the operation of the machine when the relocation determination unit determines that the machine has been relocated, or when the battery dead determination unit determines that the battery has run out. a relocation detection system comprising: a relocation unit; a canceling unit that cancels the restriction on the operation of the machine by the restricting unit; and a voltage determining unit that determines whether the battery voltage of the battery has decreased below a threshold value. and a release invalidation section that invalidates the release by the release section until the voltage determination section determines that the battery voltage is greater than the threshold value when the section restricts the operation of the machine. do.

When the relocation detection system restricts the operation of the machine, the removal of the restriction on the operation of the machine is disabled until the battery voltage becomes greater than the threshold value. Therefore, the relocation detection system can avoid lifting restrictions on machine operation when the battery voltage is low.

In the relocation detection system according to claim 2, there is provided a display control unit that displays on a display a reception screen for accepting a password for canceling the restriction on the operation of the machine; and a release validating section for validating the cancellation of the restriction on the operation of the machine by validating the display of the reception screen on the display section by the display control section, when the restriction on the operation of the machine is determined to be large. The invalidating section disables the display of the reception screen on the display section by the display control section when the voltage determining section determines that the battery voltage is below the threshold value, thereby limiting the operation of the machine. The cancellation unit disables the restriction on the operation of the machine when the cancellation validation unit validates the display and the display control unit receives the password from the reception screen displayed on the display unit. It is best to cancel it. The relocation detection system enables display of the password reception screen on the display unit when the battery voltage is higher than the threshold value. Therefore, by accepting the password while the battery voltage is low, the relocation detection system can avoid lifting restrictions on the machine's operation.

The relocation detection system according to a third aspect of the present invention may further include a notification section that notifies a decrease in the battery voltage when the voltage determination section determines that the battery voltage is less than or equal to the threshold value. Therefore, the operator can recognize the decrease in battery voltage.

A control method for a relocation detection system according to claim 4 includes a relocation determination step of determining relocation of the machine based on output information of a relocation detection unit capable of detecting relocation of the machine, and a battery supplying power to the relocation detection unit. a dead battery determination step for determining whether or not the battery has run out; and when the relocation determining step determines that the machine has been relocated, or when the dead battery determining step determines that the battery has run out, the operation of the machine is A relocation detection system comprising: a restriction step for restricting the operation of the machine; a release step for releasing the restriction on the operation of the machine due to the restriction step; and a voltage determination step for determining whether the battery voltage of the battery has decreased below a threshold value. In the control method, when the limiting step limits the operation of the machine, the canceling invalidating step invalidates the cancellation by the canceling step until the voltage determining step determines that the battery voltage is greater than the threshold value. It is characterized by having

By executing the steps described above, the relocation detection system can obtain the same effect as the numerical control device according to claim 1.

FIG. 2 is a block diagram showing the electrical configuration of the relocation detection system 100. 3 is a conceptual diagram showing various storage areas of the RAM 23. FIG. Flowchart of operation control processing. Flowchart of voltage drop determination processing. Flowchart of warning display control processing. Flowchart of cancellation processing.

Embodiments of the present invention will be described. The system configuration, processing, etc. described below are merely illustrative examples and are not intended to be limiting unless otherwise specifically stated. The drawings are used to explain technical features that can be adopted by the present invention.

The configuration of the relocation detection system 100 will be explained with reference to FIG. The relocation detection system 100 includes a numerical control device 20 and a relocation detection device 30. The numerical control device 20 is stored in a control box (not shown) provided in the machine tool 1, for example. The machine tool 1 is, for example, a machine that rotates a tool at high speed to perform cutting or the like on a workpiece. The numerical control device 20 controls the operation of the machine tool 1 by executing an NC program. The NC program is composed of a plurality of blocks containing various control commands, and controls various operations of the machine tool 1, including axis movement, tool exchange, etc., on a block-by-block basis. The relocation detection device 30 is attached to the machine tool 1 and detects the relocation of the machine tool 1 by detecting vibrations generated in the machine tool 1. The numerical control device 20 and the relocation detection device 30 can communicate with each other. When the relocation detection device 30 detects relocation of the machine tool 1, the numerical control device 20 limits the operation of the machine tool 1. Since the worker cannot use the machine tool 1, he requests the machine tool manufacturer to lift the operation restrictions. Based on a request from the worker, the machine tool manufacturer distributes to the worker a password for removing the restriction on the operation of the machine tool 1, and the worker uses the password to remove the restriction on the operation.

The electrical configuration of the numerical control device 20 will be explained 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 section 25, an AC/DC converter 26, a relocation I/F section 27, and the like. The CPU 21 centrally controls the operation of the numerical control device 20. The ROM 22 stores an operation control program, a voltage drop determination program, a cancellation program, and the like. The operation of each program will be described later. Each program may be stored in a nonvolatile storage device, an EEPROM (registered trademark), an HDD (hard disk drive), or the like as a computer-readable storage medium. The RAM 23 includes various storage areas (see FIG. 2) to be described later, and temporarily stores various information such as flags. The storage device 24 is non-volatile and stores various information in addition to the NC program. In addition to the NC program input by the operator using the operation panel 11 provided on the machine tool 1, the CPU 21 can also store, in the storage device 24, an NC program read by external input.

The machine I/F section 25 is connected to the shaft drive section (not shown) of the machine tool 1 and the operation panel 11 . The axis drive unit includes drive axes such as an X axis, a Y axis, a Z axis, a QT axis, an A1 axis, an A2 axis, a B1 axis, and a B2 axis, for example. The X-axis, Y-axis, and Z-axis are drive shafts that relatively move the main shaft and the workpiece in the X-axis direction, Y-axis direction, and Z-axis direction. The QT axis is a drive shaft of a rotary table (not shown) that holds a workpiece. The A1 axis, A2 axis, B1 axis, and B2 axis are additional axes. The operation panel 11 is provided on the cover 10 (see FIG. 1) of the machine tool 1, and includes a display section 12 and an input section (not shown). The display unit 12 displays various screens such as a setting screen and an operation screen. The input unit is, for example, a physical switch, button, touch panel, or the like. The input section includes a power switch (not shown). The AC/DC converter 26 is connected to an external AC power supply 28 and converts the AC supplied by the AC power supply 28 into DC. The AC/DC converter 26 is connected to the I/F unit 35 of the relocation detection device 30 in addition to the AC power supply 28 .

The electrical configuration of the relocation detection device 30 will be explained with reference to FIG. The relocation detection device 30 includes a CPU 31, a storage device 32, a vibration detector 33, a battery 34, an I/F section 35, and the like. The CPU 31 centrally controls the operation of the relocation detection device 30. Storage device 32 is nonvolatile. The relocation detection device 30 detects relocation of the machine tool 1 using a vibration detector 33. The vibration detector 33 is a known sensor that detects vibrations occurring in the machine tool 1. The battery 34 employs, for example, a dry battery, and is stored in a battery box (not shown) provided on the side of the control box of the machine tool 1. The I/F section 35 is connected to the relocation I/F section 27 of the numerical control device 20 and the AC/DC converter 26, respectively. When the power switch provided on the operation panel 11 of the machine tool 1 is on, the AC/DC converter 26 supplies a part of the current converted from AC to DC to the I/F unit 35. When the power switch is turned from on to off, the AC/DC converter 26 cuts off the power supply to the I/F unit 35, so the relocation detection device 30 is driven by the power supplied by the battery 34.

The storage area of the RAM 23 will be explained with reference to FIG. The RAM 23 includes a relocation detection flag storage area 231, a low battery flag storage area 232, various information storage areas 233, and the like. The relocation detection flag storage area 231 stores a relocation detection flag. The relocation detection flag is set to 1 when the relocation detection device 30 detects relocation of the machine tool 1, and is set to 0 (zero) when no relocation is detected. The low battery flag storage area 232 stores a low battery flag. The low battery flag is set to 1 when the voltage supplied from the battery 34 of the relocation detection device 30 (hereinafter referred to as battery voltage) falls below the first threshold, and to 0 when it exceeds the first threshold. do. The first threshold value is set to a voltage value higher than the second threshold value, which is a voltage value at which the relocation detection device 30 cannot be driven, for example. Note that the first threshold value is a value close to the second threshold value, and is a value that may become the second threshold value in a short time. The various information storage areas store various other information.

The operation of the relocation detection device 30 will be explained. The CPU 31 of the relocation detection device 30 monitors whether the vibration detector 33 detects vibrations of the machine tool 1 at predetermined intervals. For example, if a suspicious person attempts to illegally relocate the machine tool 1 from within the factory, vibrations will occur in the machine tool 1. The vibration detector 33 detects vibrations generated in the machine tool 1. The CPU 31 stores the detection results of the vibration detector 33 in the storage device 32 as, for example, a flag. The CPU 31 measures the battery voltage at predetermined intervals and stores it in the storage device 32. When the CPU 31 receives a confirmation signal, which will be described later, from the numerical control device 20, it transmits output information including the detection result of the vibration detector 33 and the measured battery voltage to the numerical control device 20 as a response signal.

The operation control process will be explained with reference to FIG. 3. When the power switch is turned on, the CPU 21 of the numerical control device 20 reads the operation control program from the ROM 22 and executes this process.

The CPU 21 transmits a confirmation signal to the relocation detection device 30 (S1). Upon receiving the confirmation signal, the CPU 31 of the relocation detection device 30 returns output information including the battery voltage stored in the storage device 32 as a response signal. The CPU 21 determines whether or not a response signal has been received (S3). The CPU 21 returns to S3 and waits until a response signal is received (S3: NO). When receiving the response signal (S3: YES), the CPU 21 determines whether relocation of the machine tool 1 has been detected based on the received response signal (S5).

When the relocation of the machine tool 1 is not detected (S5: NO), the CPU 21 determines whether or not the battery has run out based on the response signal (S7). The dead battery is a voltage at which the battery voltage of the battery 34 cannot drive the relocation detection device 30, and is determined by, for example, whether the battery voltage is equal to or lower than a second threshold value. If it is determined that the battery has not run out (S7: NO), the CPU 21 allows the machine tool 1 to operate (S9). The CPU 21 sets the relocation detection flag stored in the RAM 23 to 0 (S11), and ends this process. In this case, the machine tool 1 has not been relocated and the battery has not run out, so the operator can use the machine tool 1 normally.

On the other hand, when detecting that the machine tool 1 has been relocated (S5: YES), the CPU 21 restricts the operation of the machine tool 1 because there is a possibility that the machine tool 1 has been illegally relocated by a suspicious person or the like (S13). The CPU 21 sets the relocation detection flag to 1 (S15), and ends this process. The restrictions on operation include, for example, starting and stopping the machine tool 1, stopping the drive of the shaft drive unit, and stopping operations using the operation panel 11. Therefore, when the machine tool 1 is illegally relocated, the machine tool 1 cannot operate.

On the other hand, in the process of S7, if it is determined that the battery of the relocation detection device 30 has run out (S7: YES), the CPU 21 limits the operation of the machine tool 1 (S13). The CPU 21 sets the relocation detection flag to 1 (S15), and ends this process. If the power switch is turned off, the power supply source of the relocation detection device 30 is switched from the AC power supply 28 to the battery 34. When the battery runs out (S7: YES), the relocation detection device 30 cannot be driven, so the relocation detection system 100 cannot detect the relocation of the machine tool 1. Therefore, the CPU 21 can restrict the operation of the machine tool 1 (S13) and prevent the machine tool 1 from operating in a state where the relocation detection device 30 cannot detect the relocation of the machine tool 1 due to a dead battery.

The voltage drop determination process will be described with reference to FIG. 4. When the power switch is turned on, the CPU 21 reads the voltage drop determination program from the ROM 22 at predetermined intervals and executes this process. The predetermined period for executing this process is, for example, 20 msec.

The CPU 21 refers to the response signal received from the relocation detection device 30 and determines whether the battery voltage is below the first threshold (S21). When the battery voltage is higher than the first threshold (S21: NO), the CPU 21 sets the low battery flag stored in the RAM 23 to 0 (S23) and executes this process, since there is a low risk of the battery running out in a short time. finish.

On the other hand, when the battery voltage is below the first threshold (S21: YES), the CPU 21 sets the low battery flag to 1 (S25) and ends this process, since there is a high risk that the battery will run out in a short time. do.

The warning display control process will be explained with reference to FIG. This process is a process for notifying the operator by displaying various warning screens on the display unit 12 when a decrease in the battery voltage of the relocation detection device 30 or relocation of the machine tool 1 is detected. When the power switch is turned on, the CPU 21 reads the warning display control program from the ROM 22 at predetermined intervals and executes this process. The predetermined period is, for example, 30 msec.

-When detecting low battery voltage-
The CPU 21 determines whether the low battery flag stored in the RAM 23 is 1 (S31). When the low battery flag is 1 (S31: YES), the battery voltage is low, so the CPU 21 displays an alarm in the message column (not shown) of the display unit 12, for example, "Relocation detection device battery replacement time". (S33). The relocation detection system 100 promptly notifies the operator that it is time to replace the battery 34 of the relocation detection device 30.

The CPU 21 determines whether or not there is an operation by the operator on the operation panel 11 (hereinafter referred to as a panel operation) (S34). Panel operation refers to the operator operating the operation panel 11 to erase, for example, a voltage warning screen to be described later. When there is no panel operation (S34: NO), the CPU 21 determines whether a state where there is no panel operation continues for 10 minutes or more (S35). When no panel operation continues for 10 minutes or more (S35: YES), the CPU 21 pops up a voltage warning screen in a large and conspicuous manner on the display unit 12 (S37). The voltage warning screen is displayed as a pop-up on the display unit 12, overlapping the front side of the manual condition setting screen. The manual condition setting screen is a screen for setting manual conditions for each drive shaft. The voltage warning screen displays, for example, the following warnings (1) to (4).
(1) It is time to replace the battery 34 of the relocation detection device 30.
(2) The battery voltage of the relocation detection device 30 has decreased.
(3) With the power switch on, immediately replace all batteries in the battery box on the side of the control box.
(4) There is a possibility that relocation will be detected when the power switch is turned off.

If the operator turns off the power switch while the battery voltage is low, the power supply source is switched from the AC power supply 28 to the battery 34, which tends to cause the battery to run out in a short period of time. When the battery runs out, the CPU 21 restricts the operation of the machine tool 1 in the above-mentioned operation control process (see FIG. 3) in the same way as when the relocation is detected. The operator must request the machine tool manufacturer to lift the operation restrictions, which is a hassle. Therefore, the CPU 21 can display the warning (4) on the voltage warning screen to prevent the operator from turning off the power switch when the battery voltage is low. The relocation detection system 100 can prevent unnecessary restrictions on the operation of the machine tool 1. Thereafter, the CPU 21 ends this process.

For example, even if the low battery flag is 1 (S31: YES), if there is no panel operation for less than 10 minutes (S34: NO, S35: NO), the operator may operate the panel again. Therefore, the CPU 21 ends this process without pop-up displaying the voltage warning screen (S36). In this process to be executed from the next cycle onwards, if there is no panel operation for 10 minutes or more (S35: YES), the CPU 21 will pop up a voltage warning screen because it is unlikely that the operator will operate the panel immediately. (S37). Therefore, the relocation detection system 100 can reliably notify the operator that the battery voltage of the relocation detection device 30 is decreasing.

In the state where the voltage warning screen pops up, the battery voltage of the relocation detection device 30 is only decreasing, so various settings using the operation panel 11 are valid. For example, when a voltage warning screen pops up over the manual condition setting screen due to a drop in battery voltage, the operator may want to set manual conditions on the manual condition setting screen. Therefore, in this process to be executed from the next cycle onward, when the operator operates the panel (S34: YES), the CPU 21 erases the voltage warning screen (S36). Since all manual condition setting screens are displayed, the user can set manual conditions on the manual condition setting screen. Thereafter, the CPU 21 ends this process.

For example, the operator may leave the machine tool 1 for 10 minutes or more after erasing the voltage warning screen by operating the panel. Once the worker leaves the machine tool 1, he or she may forget that the battery voltage has decreased. When no panel operation continues for 10 minutes or more (S35: YES), the CPU 21 pops up the voltage warning screen again (S37). Since the worker can return to the work place and reconfirm the voltage warning screen displayed as a pop-up on the display unit 12, he or she can remember to replace the battery. That is, when the battery voltage is low, the CPU 21 repeatedly pops up a voltage warning screen on the display unit 12 every time there is no panel operation for 10 minutes or more, alerting the operator to the low battery voltage. You can be sure to let people know what you are doing. Thereafter, the CPU 21 ends this process.

-When detecting relocation-
When the low battery flag is 0 (S31: NO), the battery voltage is sufficient, so the CPU 21 determines whether the relocation detection flag is 1 (S32). When the relocation detection flag is 1 (S32: YES), the relocation of the machine tool 1 has been detected, so the CPU 21 displays an alarm saying, for example, "Relocation has been detected" in the message field of the display unit 12 (S38), A worker is immediately notified that the relocation of the machine tool 1 has been detected.

The CPU 21 determines whether or not there is a panel operation on the operation panel 11 (S39). When there is no panel operation (S39: NO), the CPU 21 determines whether a state where there is no panel operation continues for 10 minutes or more (S40). When a state in which there is no panel operation continues for 10 minutes or more (S40: YES), the CPU 21 pops up a relocation warning screen in a large and conspicuous manner on the display unit 12 (S41). The relocation warning screen is displayed as a pop-up on the display unit 12 over the front side of the manual condition setting screen. For example, the relocation warning screen displays the following warnings (1) and (2).
(1) The relocation detection device 30 has detected the relocation of the machine tool 1.
(2) Contact the machine tool manufacturer to remove the movement restriction.

Therefore, the CPU 21 can reliably notify the operator that the relocation of the machine tool 1 has been detected. As described above, when the relocation detection device 30 detects relocation, the CPU 21 limits the operation of the machine tool 1 through the operation control process (see FIG. 3). At the same time, in the warning display control process, the CPU 21 displays an alarm on the display unit 12 (S38) and pops up a relocation warning screen (S41). Therefore, the operator can easily recognize that the operation of the machine tool 1 has been restricted because the relocation of the machine tool 1 has been detected. Thereafter, the CPU 21 ends this process.

For example, even if the relocation detection flag is 1 (S32: YES), if there is no panel operation for less than 10 minutes (S39: NO, S40: NO), the CPU 21 will issue a relocation warning in the same way as when the low battery flag is 1. This process ends without displaying the screen as a pop-up (S42). In this process to be executed from the next cycle onwards, if the state of no panel operation continues for 10 minutes or more (S39: NO, S40: YES), the CPU 21 pops up a relocation warning screen (S41). Therefore, the relocation detection system 100 can reliably notify the operator that the relocation of the machine tool 1 has been detected.

When the relocation warning screen is displayed as a pop-up, various settings using the operation panel 11 are valid as in the case of the voltage warning screen. When the operator operates the panel while the relocation warning screen is displayed as a pop-up (S39: YES), the CPU 21 erases the relocation warning screen (S42). Since all manual condition setting screens are displayed, the user can set manual conditions on the manual condition setting screen. Thereafter, the CPU 21 ends this process.

For example, similar to the voltage warning screen, the operator may be away from the machine tool 1 for 10 minutes or more after the relocation warning screen is cleared by a panel operation. Once the worker leaves the machine tool 1, there is a possibility that the worker may forget that the relocation of the machine tool 1 has been detected. When no panel operation continues for 10 minutes (S40: YES), the CPU 21 pops up the relocation warning screen again (S41). The worker can return to the work place and reconfirm the relocation warning screen displayed as a pop-up on the display unit 12, so that he can take prompt action such as contacting the machine tool manufacturer to remove the operation restriction. Thereafter, the CPU 21 ends this process.

As described above, in the warning display control process shown in FIG. 5, the CPU 21 determines whether the low battery flag is 1 (S31: NO), and then determines whether the relocation detection flag is 1 (S32). That is, the CPU 21 confirms that the battery voltage has decreased before the machine tool 1 is relocated. Therefore, when the relocation of the machine tool 1 and the decrease in the battery voltage of the relocation detection device 30 are simultaneously detected, the CPU 21 limits the operation of the machine tool 1, and also displays the voltage on the display unit 12 based on the low battery flag being 1. Display a pop-up warning screen.

If a relocation warning screen were to be displayed as a pop-up, the operator would request the machine tool manufacturer to lift the operational restrictions on the machine tool 1 without replacing the battery of the relocation detection device 30. Instead of replacing the battery, the machine tool manufacturer distributes a password to the worker, and the worker uses the password to remove the operation restriction, so after the operation restriction is removed, the battery dies and the operator is unable to perform the operation again. There is a high possibility that the operation of the machine 1 will be restricted. The operator has to ask the machine tool manufacturer again to release the movement restrictions, which is a hassle. When the relocation detection system 100 of this embodiment detects the relocation of the machine tool 1 and the drop in battery voltage of the relocation detection device 30 at the same time, it pops up a voltage warning screen without displaying the relocation warning screen. It is possible to reliably prompt the person to replace the battery. Therefore, the relocation detection system 100 can prevent the operation of the machine tool 1 from being restricted again due to battery exhaustion after the restriction on the operation of the machine tool 1 is lifted.

Note that when the operator replaces the battery of the relocation detection device 30 before requesting the machine tool manufacturer to lift the operation restriction, the battery voltage exceeds the first threshold in the voltage drop determination process shown in FIG. Therefore (S21: NO), the CPU 21 sets the low battery flag to 0 (S23). In the warning display control process shown in FIG. Detected" is displayed as an alarm (S38), and a relocation warning screen is displayed as a pop-up instead of the voltage warning screen (S41). Therefore, the operator can recognize that the operation of the machine tool 1 has been restricted due to the detection of the relocation of the machine tool 1. The worker requests the machine tool manufacturer to lift the movement restrictions. Since the battery voltage of the relocation detection device 30 is sufficient, the relocation detection system 100 can prevent the battery from running out after the restriction on the operation of the machine tool 1 is lifted and the operation of the machine tool 1 from being restricted again.

The release process will be explained with reference to FIG. 6. When the CPU 21 limits the operation of the machine tool 1 in the operation control process (see FIG. 3), the machine tool 1 stops operating. Therefore, the operator cannot use the machine tool 1. In this case, as described above, the operator requests the machine tool manufacturer to lift the operation restrictions. The machine tool manufacturer notifies the operator of the password required for the release operation. The operator inputs a password into the password input screen displayed on the display unit 12 and executes a release process to release the operation restriction of the machine tool 1.

The release process is executed by the manufacturer or an operator who has obtained the password by operating the operation panel 11, for example. When the release process is executed, the CPU 21 reads the release program from the ROM 22 and executes the release process. When the cancellation process is executed, the CPU 21 determines whether the low battery flag is 1 (S101).

If it is determined that the low battery flag is not 1 (S101: NO), the CPU 21 displays a password input screen on the display unit 12 because there is a low risk that the battery will run out immediately even if the operation restriction of the machine tool 1 is canceled. (S103). Therefore, the operator can input the password obtained from the manufacturer in order to cancel the restriction on the operation of the machine tool 1 performed in the process of S13.

The CPU 21 determines whether the password input by the operator has been accepted (S105). If it is determined that the password has not been accepted (S105: NO), the CPU 21 returns the process to S105 and waits for the operator to input the password (S105).

When the operator inputs the password (S105: YES), the CPU 21 determines whether the password input by the operator is correct (S107). If the password entered by the worker is determined to be correct (S107: YES), the CPU 21 limits the operation of the machine tool 1 because there is a low risk of the battery running out soon or the operation restriction is not due to relocation by a suspicious person. is released (S109). Since the CPU 21 cancels the restriction on the operation of the machine tool 1, it sets the relocation detection flag to 0 (S111: NO) and ends this process. Therefore, the machine tool 1 becomes able to operate normally.

On the other hand, if it is determined that the password is incorrect (S107: NO), the CPU 21 displays an alarm (S113). For example, as an alarm display, a message such as "Please enter the correct password" is displayed on the display unit 12, and the process ends. Therefore, the operator can input the correct password when executing the next release process.

On the other hand, if the low battery flag is 1 (S101: YES), the CPU 21 disables the display of the password input screen because there is a high possibility that the battery will run out soon, so the CPU 21 displays an alarm without displaying the password input screen. is executed (S115), and then this process ends. For example, the alarm display indicates that the battery voltage is low, so the display section 12 displays, for example, "Please replace the battery." This allows the operator to recognize that it is time to replace the battery 34. That is, in the relocation detection system 100, the CPU 21 disables display of the password input screen until it determines that the battery voltage is higher than the first threshold. That is, the operator cannot input the password for canceling the operation restriction of the machine tool 1 performed in the process of S13 when the battery voltage is below the first threshold value. Therefore, the relocation detection system 100 can prevent the operation of the machine tool 1 from being restricted due to battery exhaustion immediately after the restriction on the operation of the machine tool 1 is lifted.

For example, the operator recognizes from the alarm display in S115 that it is time to replace the battery, and executes the battery replacement. In this case, when the process of S21 of the voltage drop determination process in FIG. 4 is executed again, the CPU 21 determines that the battery voltage is higher than the first threshold value. In this case, the CPU 21 sets the low battery flag to 0 in the process of S23, and the release of the operation restriction of the machine tool 1 becomes effective in the release process. Therefore, the operator can cancel the operation restrictions of the machine tool 1 by inputting the password from the password input screen.

As explained above, the CPU 21 determines the relocation of the machine tool 1 based on the output information of the vibration detector 33 that can detect the relocation of the machine tool 1 . The CPU 21 determines whether the battery 34 that supplies power to the vibration detector 33 has run out. When determining that the machine tool 1 has been relocated, or when determining that the battery 34 has run out, the CPU 21 limits the operation of the machine tool 1. The CPU 21 releases the restriction on the operation of the machine tool 1. The CPU 21 determines whether the battery voltage of the battery 34 has fallen below a first threshold value. When the CPU 21 restricts the operation of the machine tool 1, the CPU 21 invalidates the release until it determines that the battery voltage is higher than the first threshold. Therefore, the relocation detection system 100 can avoid lifting restrictions on the operation of the machine tool 1 in a state where the battery voltage has decreased. Furthermore, when the battery voltage is low, the relocation detection system 100 cannot release the restriction on the operation of the machine tool 1 unless the battery 34 is replaced first. Therefore, since the operator replaces the battery first, there is no need to release the restriction on the operation of the machine tool 1 due to the battery being exhausted again.

The CPU 21 displays on the display unit 12 a reception screen for accepting a password for canceling the restriction on the operation of the machine tool 1. When the CPU 21 determines that the battery voltage is higher than the first threshold value, the CPU 21 enables the display of the reception screen on the display unit 12 to enable the cancellation of the restriction on the operation of the machine tool 1. If the CPU 21 determines that the battery voltage is less than or equal to the first threshold value, the CPU 21 disables the display of the reception screen on the display unit 12, thereby disabling the release of the restriction on the operation of the machine tool 1. If the CPU 21 enables the display and receives the password from the reception screen displayed on the display unit 12, it releases the restriction on the operation of the machine tool 1. The relocation detection system 100 enables display of the password reception screen on the display unit 12 when the battery voltage is higher than the first threshold value. Therefore, the relocation detection system 100 can avoid lifting restrictions on the operation of the machine tool 1 by accepting the password in a state where the battery voltage is low.

When the CPU 21 determines that the battery voltage is less than or equal to the first threshold value, the CPU 21 notifies the user that the battery voltage has decreased. Therefore, the operator can recognize the decrease in battery voltage.

The present invention is not limited to the above embodiments, and various modifications are possible. In the above embodiment, the relocation detection system 100 is for detecting the relocation of the machine tool 1, but it may also detect the relocation of a type of machine other than the machine tool. In this case, the relocation detection device 30 may detect vibrations of other machines. Although the relocation detection device 30 is attached to the machine tool 1, for example, only the vibration detector 33 may be attached to the machine tool 1. The method of detecting relocation may be other than the method of detecting vibration, for example, the method of detecting acceleration, inclination, etc. can be adopted.

In the above embodiment, the release of the operation restriction is disabled by disabling the display of the password input screen, but the present invention is not limited to this. For example, the operation restriction may not be canceled and a password input screen may be displayed. In this case, the CPU 21 need not accept the input password. In other words, the CPU 21 may invalidate the release of the operation restriction.

In the operation control process of the embodiment described above, only a dead battery is determined, but a voltage drop determination process may be incorporated to detect a voltage drop as well. The first threshold value and the second threshold value may be set as appropriate. An alarm is displayed to notify of a decrease in the battery voltage of the machine tool 1, but in addition to the display, notification may be made using a light emitting means such as a lamp or LED, or by sound, or a combination of these may be used. You can.

In the above embodiment, the cycle for executing the voltage drop control process is 20 msec, but each cycle can be freely changed. The cycle for executing the warning display control process is 30 msec, but each cycle can be changed freely.

The operation control process (see FIG. 3), the voltage drop determination process (see FIG. 4), and the cancellation process (see FIG. 5) of the above embodiment are not limited to the example executed by the CPU 21, and may be executed by other electronic components (for example, ASIC, FPGA) may be executed.

In the above explanation, the machine tool 1 is an example of the machine of the present invention. The vibration detector 33 is an example of a relocated detection section of the present invention. The CPU 21 that executes the process of S5 in FIG. 3 is an example of the relocation determination section of the present invention. The CPU 21 that executes the process of S7 is an example of the battery exhaustion determination section of the present invention. The CPU 21 that executes the process in S13 is an example of a restriction unit of the present invention. The CPU 21 that executes the process of S109 in FIG. 6 is an example of the canceling unit of the present invention. The CPU 21 that executes the process of S21 in FIG. 4 is an example of the voltage determination section of the present invention. The CPU 21 that executes the process of S25 is an example of the cancellation invalidation unit of the present invention. The CPU 21 that executes the process of S103 in FIG. 6 is an example of the display control unit of the present invention. The CPU 21 that executes the process of S23 in FIG. 4 is an example of a cancellation effective section. The CPU 21 that executes the process of S115 is an example of the notification section of the present invention.

1 Machine tool 12 Display section 20 Numerical control device 21 CPU
30 Relocation detection device 34 Battery 100 Relocation detection system

Claims (4)

a relocation determination unit that determines relocation of the machine based on output information of a relocation detection unit capable of detecting relocation of the machine;
a battery exhaustion determination unit that determines whether a battery that supplies power to the relocation detection unit is exhausted;
a restriction unit that limits the operation of the machine when the relocation determination unit determines that the machine has been relocated, or when the battery exhaustion determination unit determines that the battery is exhausted;
a release unit that releases the restriction on the operation of the machine by the restriction unit;
A relocation detection system comprising a voltage determination unit that determines whether the battery voltage of the battery has decreased below a threshold value,
and a release invalidation unit that invalidates the release by the release unit until the voltage determination unit determines that the battery voltage is greater than the threshold value when the restriction unit restricts the operation of the machine. Features a relocation detection system. a display control unit that displays on the display a reception screen for accepting a password for canceling the restriction on the operation of the machine;
If the voltage determination unit determines that the battery voltage is higher than the threshold value, the display control unit enables the display of the reception screen on the display unit, thereby canceling the restriction on the operation of the machine. and a cancellation effective part to be effective,
The cancellation invalidation unit disables the display of the reception screen on the display unit by the display control unit when the voltage determination unit determines that the battery voltage is equal to or less than the threshold value, thereby controlling the operation of the machine. invalidate the lifting of restrictions;
The release unit is characterized in that when the release validating unit enables the display and the display control unit receives the password from the reception screen displayed on the display unit, the release unit releases the restriction on the operation of the machine. The relocation detection system according to claim 1. 3. The relocation detection system according to claim 1, further comprising a notification section that notifies a decrease in the battery voltage when the voltage determination section determines that the battery voltage is less than or equal to the threshold value. a relocation determination step of determining relocation of the machine based on output information of a relocation detection unit capable of detecting relocation of the machine;
a battery exhaustion determination step of determining whether a battery that supplies power to the relocation detection unit is exhausted;
If the relocation determining step determines that the machine has been relocated, or if the battery exhaustion determining step determines that the battery is exhausted, a limiting step of restricting the operation of the machine;
a release step of releasing the restriction on the operation of the machine due to the restriction step;
A method for controlling a relocation detection system, comprising: a voltage determination step of determining whether the battery voltage of the battery has decreased below a threshold value;
If the limiting step limits the operation of the machine, the step of disabling the cancellation by the canceling step is made invalid until the voltage determining step determines that the battery voltage is greater than the threshold value. A control method for a featured relocation detection system.

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