JP2009230189A - Power controller for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect the movement of a factory machine caused from transfer or resale and notify this to the operator. <P>SOLUTION: When a factory power source voltage to supply to a machine tool 1 is being lost, a capacitor 45 of a power source monitoring unit 40 installed in a power controller maintains the power distribution of a second relay 42 for a predetermined time period; and when the predetermined time period has elapsed, after the loss of the factory power source voltage, the second relay 42 records the corresponding elapse trace to output the trace as a power source shutoff signal to a CPU 31 at the next turning on of the power. Thus, the controller reads the recorded data in a RAM 33; and when detecting the elapse trace, it is able to notify of this to the operator. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power control device for a machine tool that controls power supply to the machine tool.

  Machine tools that require precision machining by operators must be maintained by technical personnel such as manufacturers for performance assurance when the machine tools have moved significantly due to relocation or resale, for example. It is necessary to check. From this point of view, for example, there is a technique described in Patent Document 1 as a prior art for notifying a warning to an operator by detecting relocation or resale of a machine tool.

In this prior art, the vibration detection means detects that vibration has been applied to the machine tool, and the vibration history storage means records the presence or absence of the detected vibration as the vibration history. When the vibration history storage means stores the vibration history, the fact is notified and the start prohibiting means prohibits the start of the machine tool.
JP 2003-35595 A

  In the above prior art, the relocation of the machine tool due to relocation or resale is determined only by the vibration history. For this reason, it is misjudged that the machine tool has been moved even when it is not relocated or resold, such as when a relocation in the factory or an earthquake occurs, and a warning is given to the operator or startup is performed. There was a risk of limiting.

  An object of the present invention is to provide a power control device for a machine tool that can reliably detect a factory machine relocation or a relocation due to resale and notify the operator of the relocation.

  To achieve the above object, according to a first aspect of the present invention, there is provided energization holding means for maintaining energization as a substitute power source for a predetermined period when a main power supply voltage for supplying power to a machine tool is lost, and after the loss of the main power supply voltage, An energization completion detecting means for detecting that energization by the energization holding means is completed, and a predetermined activation restriction in starting the machine tool when the energization completion detecting means detects that energization by the energization holding means is completed. And an activation restriction means for providing

  The power control device for a machine tool according to the first invention of the present application includes energization holding means, energization completion detection means, and activation restriction means. When the voltage supply of the machine tool from the main power supply is stopped for some reason, the energization holding means supplies a voltage and holds the energization for a predetermined period instead. When the predetermined period elapses while the supply of the main power supply voltage is stopped, the energization holding means cannot be held and the energization is stopped. The energization completion detection means detects that the energization cannot be held after a predetermined period has elapsed.

  Therefore, when the energization completion detection unit detects that the energization cannot be held, it is possible to notify the operator to that effect. As a result, when the voltage supply from the main power supply is simply stopped, the operator is not notified of the fact, but the operator can be notified on the condition that the stopped state has continued for a predetermined period. Therefore, it is possible to exclude the short-time power supply stoppage due to the occurrence of a power failure or rearrangement in the factory, and reliably notify the operator only of the long-time power supply stoppage due to relocation or resale.

  Further, by excluding cases such as the occurrence of a power failure or rearrangement in this way, the activation restriction means gives a restriction on activation when a long-time power supply stop state is detected (considered as relocation or resale). As a result, when improper transfer or resale is performed on the machine tool, it is possible to suppress or prevent the device from being damaged or the durability from being lowered due to the start-up, or the unauthorized use due to theft or the like. .

  According to a second aspect of the present invention, in the first aspect of the present invention, further comprising vibration detecting means for detecting vibration of the machine tool, wherein the activation restricting means indicates that the energization holding means has completed energization by the energization completion detecting means. When detected, the activation restriction is given according to the detection result of the vibration detection means.

  Even when a prolonged power supply stop state is detected, there may be a case where the power failure time is simply long. In the power control device for a machine tool according to the second invention of the present application, the vibration detecting means detects the vibration of the machine tool, and the activation limiting means is the vibration detecting means even when the energization completion detecting means detects the completion of energization by the energization holding means. The activation is limited according to the detection result. As a result, if no vibration is detected even after the power supply is stopped for a long time, it is possible to prevent the start-up restriction from being added (considering that the power failure time is prolonged, etc.). As a result, it is possible to avoid the start restriction that is originally unnecessary, so that the convenience of the operator can be further improved.

  According to a third aspect of the present invention, in the second aspect of the invention, vibration history storage means for storing that the vibration of the machine tool has been detected by the vibration detection means, and energization by the energization holding means has been completed by the energization completion detection means. And initialization means for erasing the information stored in the vibration history storage means when the vibration history storage means stores that the vibration of the machine tool has been detected. It is characterized by that.

  Even if vibration is detected, if power supply is not stopped for a long time, the start restriction is not applied and the history of vibration of the machine tool is deleted. By not considering vibration during power feeding, it is possible to reliably avoid unnecessary start restrictions when an earthquake occurs. Further, in the case of vibration during power feeding by the initialization means, the vibration history is erased, so that only vibration when power feeding is stopped can be detected, and unnecessary start restrictions can be further avoided.

  A fourth invention is characterized in that, in the first to third inventions, there is provided voltage conversion means for converting the main power supply voltage into a voltage equivalent to an energization voltage that can be held by the energization holding means.

  The power control device for a machine tool according to the fourth invention of the present application has voltage conversion means. The voltage conversion means converts the main power supply voltage into a value equivalent to the energization voltage by the energization holding means. Thus, the voltage converted by the voltage conversion means can be supplied when the main power supply voltage is supplied, and the energization voltage from the energization holding means can be supplied when the main power supply voltage is lost.

  According to a fifth invention, in the fourth invention, the energization holding means is a capacitor connected to the output side of the voltage conversion means so as to store the charge after the main power supply voltage is converted by the voltage conversion means. It is characterized by being.

  The power control device for a machine tool according to the fifth aspect of the present invention uses a capacitor as the energization holding means. As a result, when the main power supply voltage is supplied, the voltage converted by the voltage conversion means is supplied, while the charge generated by the converted voltage can be stored in the capacitor. When the main power supply voltage is lost, the energized voltage can be supplied for a predetermined period using the stored charge.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the main power supply voltage or the energization voltage is closed when the main power supply voltage or the energization voltage is supplied, and neither the main power supply voltage nor the energization voltage is supplied. Is further provided with a relay having a switch which is in an open state, wherein the energization completion detecting means detects the open state of the switch.

  When neither the main power supply voltage nor the energized voltage is supplied, the switch is changed from the closed state to the open state. The energization completion detecting means detects the open state of the switch, so that it can be detected that the supply of the main power supply voltage is stopped and the supply of the energization voltage is also stopped after a predetermined period.

  According to a seventh aspect, in the sixth aspect, the relay includes a switch opening / closing coil that is excited when the main power supply voltage or the energization voltage is supplied and drives the switch to a closed state.

  By driving the switch opening / closing coil in the closed state, it is possible to reliably record that the supply of the energized voltage has stopped after a predetermined period has elapsed. Further, by driving to the closed state, it is possible to reset the record history of the trace of the open state up to that point.

  According to an eighth invention, in any one of the first to fifth inventions, when the main power supply voltage or the energization voltage is supplied, predetermined information is stored and held, and neither the main power supply voltage nor the energization voltage is supplied. Further, the apparatus further comprises volatile storage means for losing the stored predetermined information when the storage is completed, and the energization completion detection means detects a loss state of the predetermined information in the storage means.

  When neither the main power supply voltage nor the energized voltage is supplied, the storage means loses the predetermined information stored and held. The energization completion detecting means detects that the predetermined information is lost in the storage means, and detects that the supply of the main power supply voltage is stopped and the supply of the energized voltage is also stopped after a predetermined period has passed. be able to.

  According to a ninth invention, in any one of the first to fifth inventions, when the main power supply voltage or the energization voltage is supplied, the ninth invention is located at the first position, and neither the main power supply voltage nor the energization voltage is supplied. In this case, it further comprises a moving body that moves to the second position, and the energization completion detecting means detects that the moving body is in the second position.

  When neither the main power supply voltage nor the energized voltage is supplied, the moving body moves from the first position to the second position. The energization completion detecting means can detect that the supply of the main power supply voltage is stopped and the supply of the energization voltage is also stopped after a predetermined period has elapsed by detecting that the moving body is in the second position. .

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, the moving body is constituted by an electrode, and the moving body at the second position is excited to be driven to the first position when the main power supply voltage or the energization voltage is supplied. An electrode moving coil is provided.

  By driving the electrode to the first position by the electrode moving coil, it is possible to reliably record that the supply of the energized voltage has stopped after a predetermined period has elapsed. Further, by driving to the first position, it is possible to reset the recording history of traces by the second position.

  According to the present invention, it is possible to reliably detect a factory machine relocation or a relocation due to resale or the like, and notify the operator to that effect.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a machine tool provided with an embodiment of the power supply control device of the present invention, and FIG. 2 is a perspective view showing a machine body of the machine tool.

  As shown in FIGS. 1 and 2, the machine tool 1 includes an iron base 2, a machine body 3 provided on the top of the base 2, and a splash cover 4 provided on the base 2 and covering the machine body 3. And have. A front opening (not shown) is provided in front of the splash cover 4, and a pair of sliding opening / closing doors 5, 6 are provided in the front opening. Rectangular glass windows 5a and 6a are respectively provided in the approximate centers of the open / close doors 5 and 6, respectively. A handle 5 b is provided at the right end of the open / close door 5, and a handle 6 b is provided at the left end of the open / close door 6.

  The machine tool 1 performs a desired cutting process on the workpiece by relatively moving the workpiece and the tool. An operation panel 10 for operating the machine tool 1 is provided on the right side of the front opening. A keyboard 13 having various operation buttons is provided on the lower side of the operation panel 10, and a display panel 34 for displaying various setting screens for setting tool data and the like described later is provided on the upper side of the operation panel 10. ing.

  The machine body 3 includes a column 16, a spindle head 7, a spindle 9, a tool changer 20, a tool magazine 21, and a table 15. The column 16 is erected on the upper rear side of the base 2. The spindle head 7 is provided along the front surface of the column 16 so as to be lifted and lowered. A main shaft 9 is rotatably supported under the main shaft head 7. The tool changer 20 is provided on the right side of the spindle head 7 and automatically changes the tool mounted on the spindle 9. The tool magazine 21 is provided on the right side of the tool changer 20, and stores and holds a plurality of tools. The table 15 is provided on the upper part of the base 2.

  A control box 17 is provided on the back surface of the column 16, and a control device for the machine tool 1 is accommodated inside the control box 17. The control device includes an NC control device that controls the operation of the machine tool 1 and a power supply control device 30 (see FIG. 3 described later) of the present embodiment.

  The spindle head 7 is supported so as to be movable up and down along a guide rail (not shown) provided on the front side of the column 16, and a feed screw to which the spindle head 7 is attached is driven to rotate forward and backward by a Z-axis motor. As a result, the spindle head 7 moves up and down. The spindle 9 is provided with a spindle on which a tool is mounted, and the spindle rotates by driving the spindle by a spindle motor provided on the spindle head 7.

  A table 15 is provided above the base 2 so as to be movable in the X-axis direction and the Y-axis direction. The moving mechanism of the table 15 includes a Y-axis feed guide provided in the upper part of the base 2 and extending in the Y-axis direction, a support base 12 movably supported along the Y-axis feed guide, and an upper surface of the support base 12. And an X-axis feed guide extending in the X-axis direction. A table 15 is movably supported on the X-axis feed guide. The table 15 is moved in the X-axis direction and the Y-axis direction by an X-axis motor and a Y-axis motor that are servo motors.

  The tool changer 20 exchanges the tool mounted on the spindle 9 and the tool at the standby position (tool change preparation position) of the tool magazine 21. The tool changer 20 includes a turning shaft (not shown) that is turned by driving a tool changing motor (not shown). A tool change arm 20a for holding a tool is connected to the lower part of the pivot shaft. When the tool is held by the tool change arm 20a, the tool change arm 20a turns together with the turning shaft, so that the tool mounted on the spindle 9 and the tool at the standby position of the tool magazine 21 are switched.

  The tool magazine 21 includes a magazine base (not shown), a pair of sprockets provided on the magazine base, an endless chain spanned between the sprockets, and a plurality of brackets fixed to the outer peripheral side of the chain. Yes. A tool pot into which a tool such as a tap or a drill fits is attached to each bracket. One sprocket is rotationally driven by a magazine motor, thereby transferring a plurality of tool pots together with a chain inside the tool magazine 21. With the above configuration, the machine tool 1 processes the workpiece placed on the table 15 by NC control using the tool mounted on the spindle 9 of the machine body 3.

  The power supply control device of this embodiment will be described with reference to FIGS. As illustrated in FIG. 3, the power supply control device 30 includes a microcomputer including a CPU 31, a ROM 32, and a RAM 33.

  A ROM 32, a RAM 33, a display unit 34, an input unit 35, and a machine operation unit 36 are connected to the CPU 31 via an input / output interface (not shown). The machine operation unit 36 includes, for example, each operation unit such as an X-axis motor, a Y-axis motor, a Z-axis motor, a main shaft motor, and a tool replacement motor provided in the machine body 3 of the machine tool 1, the operation panel 10, and the like. And a display unit such as a display panel 34. In addition, a power supply monitoring unit 40 is connected to the CPU 31 via an input / output interface 39. The power supply monitoring unit 40 is connected to a factory power supply (main power supply) having a predetermined voltage (for example, single-phase 200 V) through a power supply line L1.

  The power supply control device 30 includes an AC / DC converter 38 (first AC / DC converter) connected to a factory power supply by a power supply line L2. A mechanical breaker 37 is provided on the power supply line L2. The AC / DC converter 38 constitutes a mechanical DC power supply, converts an AC single-phase 200V (main power supply voltage) from a factory power supply into a DC voltage of 3.3V, and supplies power to each control circuit portion. After the mechanical breaker 37, the AC three-phase 200V is directly connected to the machine operating unit 36 via a relay (not shown). The power monitoring unit 40 is also connected to the AC / DC converter 38.

  As shown in FIG. 4, the power monitoring unit 40 includes a first relay 41, a second relay 42, an AC / DC converter 43 (second AC / DC converter, voltage conversion means), and a capacitor 45 (energization holding means). And.

  The AC / DC converter 43 converts the single-phase 200V AC from the factory power supply, which is the main power supply voltage, into a DC voltage equivalent to the energization voltage that can be held by the capacitor 45, in this example, 3.3V DC. The input side of the AC / DC converter 43 is connected to the feeder line L1. The output side of the AC / DC converter 43 is connected to one end of a coil 42 a (switch opening / closing coil) provided on the control side of the second relay 42 via a diode 44. One end of a capacitor 45 is connected between the output side of the diode 44 and one end on the control side of the second relay 42, and the other end of the capacitor 45 is grounded. The capacitor 45 has a capacity (for example, 1F) capable of supplying a charge for a predetermined period to be described later.

  The second relay 42 is a two-contact type relay that opens and closes the first and second switches 42b and 42c with a coil 42a. One end of the switch 42b of the second relay 42 is connected to the other end of the coil 42a of the second relay 42, and the other end of the switch 42b is grounded. One end of the switch 42 c is connected to the mechanical DC power supply, that is, the output side of the first AC / DC converter 38, and the other end of the switch 42 c is connected to the input / output interface 39 of the power supply control device 30.

  The first relay 41 is a one-contact type relay that opens and closes a switch 41b with a coil 41a. One end of the switch 41b of the first relay 41 is connected to one end of the coil 42a of the second relay 42, and the other end of the switch 41b is grounded. One end of the coil 41a of the first relay 41 is connected to the input / output interface 39 of the power supply control device 30, and the other end of the coil 41a is grounded.

  The operations of the first relay 41 and the second relay 42 are as follows.

(A) Normal time When the mechanical breaker 32 is turned ON when the factory power source is not lost (normal time), the switch 41b of the first relay 41 is in a closed state. Further, the switches 42b and 42c of the second relay 42 are also closed by the exciting attractive force of the coil 42a excited by the voltage supply from the second AC / DC converter 43.

  When the mechanical breaker 32 is turned off when the factory power is not lost, the power supply from the AC / DC converter 38 is cut off, and the latch signal from the CPU 31 disappears, so the coil 41a is de-energized and the switch 41b of the first relay 41 is turned off. Is open. However, since the factory power supply is not lost, the current for exciting the coil 42a continues to flow through the switch 42b.

(B) After factory power is lost If the factory power is lost for some reason, the latch signal from the CPU 31 is lost, so the coil 41a is de-energized and the switch 41b of the first relay 41 is opened. Further, due to the loss of the factory power supply, the voltage supply from the first AC / DC converter 38 of the power supply control device 30 to the second relay 42 (specifically, the switch 42c) is stopped. Further, the voltage supply from the second AC / DC converter 43 to the second relay 42 (details: coil 42a) is also stopped. As a result, the capacitor 45 acts as a substitute power supply in place of the second AC / DC converter 43, the electric charge stored in the capacitor 45 flows to the coil 42a of the second relay 42, and a voltage is applied to the coil 42a of the second relay 42 to a predetermined value. Supply for a period (for example, about 1 minute). As a result, the switches 42b and 42c of the second relay 42 maintain the closed state for a predetermined period from the time when the factory power supply is lost by the exciting attractive force of the coil 42a excited by the voltage supply from the capacitor 45. Although the switch 42c is kept closed, the voltage supply from the first AC / DC converter 38 to the switch 42c is stopped due to the loss of the factory power supply, and energization is not performed.

  Then, when the predetermined period of time elapses while the voltage supply of the factory power supply (voltage supply from the second AC / DC converter 43) is stopped, the exciting suction force of the coil 42a is lost. As a result, the contacts of the switches 42b and 42c of the second relay 42 are opened (this indicates that the energization by the energization holding means has been completed, and this energization completion is detected at the next power-on as will be described later. . If the factory power supply is restored before the predetermined period elapses after the factory power supply is lost, the voltage supply from the second AC / DC converter 43 to the coil 42a is resumed before the charge of the capacitor 45 is exhausted. The contacts of the switches 42b and 42c of the relay 42 do not open (energization cannot be detected by the energization completion detection means).

(C) Factory power supply restoration After that, the factory power supply is restored, the machine breaker 32 is turned on and then the machine power supply is turned on to start the machine tool 1 (= when the machine is started next time). Thus, the state of the switch 42c of the second relay 42 is detected, and the state of the switch 42c is stored in the RAM 33. When the contact of the switch 42c of the second relay 42 is open (when no mechanical DC power is input), the CPU 31 sets the input / output interface 39 on condition that the password is input from the keyboard 13 provided on the operation panel 10. The latch signal is output to the first relay 41 via the first relay 41. That is, a latch signal is output to the coil 41a of the first relay 41 to excite the coil 41a. As a result of the switch 41b being closed by the attracting force of the excited coil 41a, the current generated by the voltage conversion in the second AC / DC converter 43 flows to the second relay 42 and the first relay 41, thereby exciting the coil 42a. The contacts of the switches 42b and 42c are closed again by the attracting force of the excited coil 42a. This notifies the CPU 31 that mechanical DC power is being input via the switch 42c and the input / output interface 39.

  Next, control in the power supply control device of this embodiment will be described. In this embodiment, the CPU 31 outputs a latch signal to the first relay 41 on the condition that a password is entered on the keyboard 13 provided on the operation panel 10 at the time of restoration after the factory power supply is shut off. FIG. 5 is a flowchart showing a detailed procedure executed by the CPU 31 of the power supply control device 30. This flow starts when the operator closes the mechanical breaker 37 of the power supply control device 30 and turns on the factory power supply in order to activate the machine tool 1 after the factory power supply is lost.

  In FIG. 5, first, in step S10, data stored in the RAM 33 of the power supply control device 30 is read to determine whether or not the voltage supply by the capacitor 45 has been completed (energization completion detection means). When the supply of voltage by the capacitor 45 is stopped after the factory power supply has been lost for a predetermined period, the trace is stored in the RAM 33 as the power cutoff history as described above. Therefore, the determination at step S10 is satisfied, and the routine goes to the next step S20.

  On the other hand, if there is no loss of the factory power supply, or even if the factory power supply is lost, if the factory power supply is restored during the voltage supply by the capacitor 45, there is no storage of the power cut-off history in the RAM 33. Therefore, the determination in step S10 is not satisfied, and this flow is terminated as it is.

  In step S20, a control signal is output to the machine operation unit 36 to prohibit activation of the machine tool 1, and a control signal is output to the display unit 34 of the operation panel 10 of the machine tool 1 to warn the display unit 34. Display a message. The warning message is such that the machine tool 1 cannot be started unless a password is entered. Accordingly, the operator can input a password to the machine tool 1 by using the keyboard 13 while viewing the display on the display unit 34.

  In the next step S30, it is determined whether or not the password input by the operator is correct, that is, whether or not it matches the password set in the machine tool 1. Until the entered passwords match, the determination in step S30 is not satisfied and the process returns to step S20 and the same procedure is repeated. If the entered passwords match, the determination at step S30 is satisfied, and the routine goes to the next step S40. In addition, the procedure of said step S20 and step S30 comprises the starting restriction | limiting means as described in each claim.

  In the next step S40, in response to the input passwords being matched, a control signal is output to the machine operation unit 36, and the activation prohibition of the machine tool 1 is released. A control signal is output to the display unit 34 of the operation panel 10 to cancel the display of the warning message on the display unit 34. A latch signal is output from the CPU 31 to the first relay 41. A control signal is output to the RAM 33, the power-off history stored in the RAM 33 is erased, and this flow ends.

  As described above, the power supply control device 30 according to the present embodiment, when the voltage supply from the factory power supply is stopped for some reason, the capacitor 45 supplies a voltage to the coil 42a of the second relay 42 for a predetermined period instead. Supply and hold energization. Thereafter (when the supply of the factory power supply voltage is stopped), when a predetermined period elapses and the electric charge stored in the capacitor 45 is exhausted, the energization of the coil 42a is stopped. As a result, when the switch 42c is in the open state, a trace that a predetermined period has elapsed since the loss of the factory power supply is recorded. When the factory power is restored and the machine tool 1 is started next time, the CPU 42 stores the power cut-off history signal in the RAM 33 because the switch 42c is open. The CPU 31 performs notification (message display) corresponding to the information stored in the RAM 33 to the operator (see step S20).

  As described above, the power supply control device 30 according to the present embodiment does not notify the operator when the voltage supply from the factory power supply is simply stopped, but is provided that the stopped state continues for a predetermined period. It is possible to notify the operator. Accordingly, it is possible to exclude the short-time power supply stoppage due to the occurrence of a power failure or the rearrangement of the machine tool 1 in the factory, and to reliably notify the operator only of the power supply stoppage state for a long time due to relocation or resale. .

  In the present embodiment, in particular, when there is a power supply stop state for a long time, in step S20, a warning message is displayed on the display unit 34 to the effect that normal startup is not possible unless a password is entered. 1 is prohibited from starting. Thereby, when improper transfer or resale is performed with respect to the machine tool 1, the device may be damaged or the durability may be deteriorated due to starting as it is, or unauthorized use due to theft or the like may be suppressed or prevented. it can.

  The present invention is not limited to the above, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described.

(1) In the case of using SRAM In this modification, as shown in FIG. 6, the power supply monitoring unit 40A is provided with SRAM 50 as energization completion detection means, and a predetermined time until the charge of the capacitor 45 after the factory power supply is exhausted is exhausted. The progress trace is recorded in the SRAM 50 (volatile storage means). The SRAM 50 is connected to the CPU 51. The power supply of the SRAM 50 is connected to the output side of the second AC / DC converter 43 via a diode 44. A grounded capacitor 45 is connected between the diode 44 and the SRAM 50.

  The SRAM 50 does not erase the stored data while the voltage is supplied, but has a property of erasing the data when the voltage supply is stopped. Therefore, in this modification, the CPU 51 writes a specific value as discrimination data in advance in the SRAM 50.

  When the voltage supply from the second AC / DC converter 43 to the SRAM 50 is stopped due to the loss of the factory power supply, the voltage supply from the capacitor 45 is started instead as in the above embodiment. Then, after a predetermined period until the electric charge of the capacitor 45 is exhausted, the voltage is not supplied to the SRAM 50. As a result, the data stored in the SRAM 50 is lost, and there is no discrimination data (there is no stored data), so that it can be recorded as a progress trace after a predetermined period.

  When the machine tool 1 is started after the factory power supply is restored (= next startup), the CPU 31 reads the data in the SRAM 50. If it is detected that the data has disappeared (energization completion detection means), it is determined that the power supply has been stopped for a long time due to the transfer or resale of the machine tool 1, and the operator is notified (as in the above embodiment). Activation prohibition can be performed, and the same effect can be obtained.

(2) In case of using electrode movement FIG. 7 is an explanatory view showing this modification. As shown in FIG. 7, the power supply monitoring unit 40B includes an electrode dropping device 160 (moving body detection device). The electrode dropping device 160 includes an electrode 60 (moving body) accommodated in the cylindrical body 61, and a holding electromagnet 54 and a resetting electromagnet 55 disposed above the cylindrical body 61.

  The holding electromagnet 54 is for holding the electrode 60 on the upper portion (first position) of the cylindrical body 61. The output side of the second AC / DC converter 43 is connected to the holding electromagnet 54 via a diode 44. A grounded capacitor 45 is connected between the diode 44 and the holding electromagnet 54. The reset electromagnet 55 (electrode moving coil) is for pulling up the electrode 60 located at the lower part (second position) of the cylindrical body 61 to the first position by dropping.

  The holding electromagnet 54 has a magnetic force to hold the electrode 60 in the first position in the first position, but does not have a large magnetic force to suck up the electrode 60 in the second position from the second position to the first position. A reset electromagnet drive circuit 56 is connected to the reset electromagnet 55 in order to generate a large magnetic force. Electrode sensors 64a and 64b for detecting the presence of the electrode 60 at the first position or the second position are disposed on the upper and lower sides of the cylindrical body 61, respectively. The output sides of the electrode sensors 64 a and 64 b are connected to the CPU 31 via the input / output interface 39.

  When the voltage from the second AC / DC converter 43 is supplied to the holding electromagnet 54, the electrode 60 in the cylindrical body 61 is held at the first position by the magnetic force of the excited holding electromagnet 54. When the factory power supply is lost, the voltage supply from the second AC / DC converter 43 is stopped, and when a predetermined period has elapsed from the loss of the factory power supply, the voltage supply to the holding electromagnet 54 by the capacitor 45 is stopped. As a result, the holding of the electrode 60 by the holding electromagnet 54 is lost, and the electrode 60 falls within the cylindrical body 61 by gravity and reaches from the first position on the upper side of the cylindrical body 61 to the second position on the lower side. Therefore, after detecting that the electrode sensor 64a exists at the first position, the electrode sensor 64b detects that the electrode 60 is at the second position, thereby detecting the trace that the predetermined period has elapsed. (Energization completion detection means). As a result, it can be determined that the power supply has been stopped for a long time due to the transfer or resale of the machine tool 1, and the operator can be notified or the activation can be prohibited (similar to the above embodiment), and the same effect can be obtained. be able to.

  When the machine tool 1 is activated after the factory power supply is restored (= next activation), the CPU 31 inputs a control signal to the reset electromagnet drive circuit 56 and excites the reset electromagnet 55. Thereby, the electrode 60 can be sucked up from the second position to the first position by magnetic force. After the electrode 60 is moved in this way, the trace of the predetermined period is reset (since it has returned to the first position). Thereafter, the electrode 60 can be maintained at the first position by the holding electromagnet 54.

(3) When resetting with a cylinder In the modified example of (2) above, the electrode 60 is returned from the lower second position of the cylindrical body 61 to the upper first position by the resetting electromagnet 55. Not exclusively. In this modification, as shown in FIG. 8, a cylinder 62 is provided instead of the reset electromagnet 55, and the electrode 60 is returned to the first position. The cylinder 62 is provided below the cylinder 61, and a piston rod 62 a extending from the cylinder 62 is inserted into the cylinder 61. A support plate 63 is provided at the tip of the piston rod 62 a, and the support plate 63 is provided in the lower part in the cylindrical body 61.

  In this modified example, when a predetermined period has elapsed since the loss of the factory power source and the electrode 60 falls in the cylinder 61 from the first position at the upper part of the cylinder 61, the support plate 63 is at the second position at the lower part of the cylinder 61. The electrode 60 is received. Thereafter, by extending the piston rod 62 a of the cylinder 62, the electrode 60 on the support plate 63 can be lifted to the first position above the cylindrical body 61 and returned.

(4) When using vibration detection In this modification, as shown in FIG. 9, the power supply control device 30A adds a vibration detection device 70 (vibration detection means) to the power supply control device 30 of FIG. Further, the power monitoring unit 40 has the same configuration as that described above with reference to FIG.

  The vibration detection device 70 has a function of detecting vibration and a function of storing detection data in the RAM 33 as a history (regardless of power supply). The RAM 33 corresponds to vibration history storage means.

  Control in this modification will be described with reference to FIG. FIG. 10 is a flowchart showing a detailed procedure executed by the CPU 31 of the power supply control device 30. This flow starts when the operator closes the mechanical breaker 37 of the power supply control device 30 and turns on the factory power supply in order to activate the machine tool 1 after the factory power supply is lost.

  In FIG. 10, first, in step S110, it is determined whether or not there is a power shutdown history. This is similar to step S10 of FIG. 5, the data stored in the RAM 33 of the power supply control device 30 is read, and it is determined whether there is a power cut-off history. If there is a power cut-off history, the determination at step S110 is satisfied, and the routine goes to the next step S120. If there is no power shutdown history, the determination in step S110 is not satisfied, and the routine goes to step S160.

  In step S120, it is determined whether there is a vibration history during power-off. This can be determined by whether or not there is a vibration history in the data read from the vibration detection device 70 and stored in the RAM 33 as described above. If there is a vibration history, the determination in step S120 is satisfied, the vibration history is stored in the RAM 33, and the process proceeds to the next step S130. If there is no vibration history, the determination in step S120 is not satisfied, the power cutoff history in the RAM 33 is cleared in step S180, and this flow ends.

  In step S130, as in step S20, a control signal is output to the machine operation unit 36 to prohibit activation of the machine tool 1, and a control signal is output to the display unit 34 of the operation panel 10 of the machine tool 1. The display unit 34 displays a warning message similar to that described above. As a result, the operator views the display on the display unit 34 and inputs the password to the machine tool 1 using the keyboard 13.

  In the next step S140, as in step S30, it is determined whether or not the password entered by the operator is correct. Until the entered passwords match, step S140 is not satisfied and the process returns to step S130 and the same procedure is repeated. If the entered passwords match, the determination at step S140 is satisfied, and the routine goes to the next step S150. In addition, the procedure of the said step S130 and step S140 comprises the starting restriction | limiting means as described in each claim.

  In the next step S150, as in step S40, a control signal is output to the machine operation unit 36 to cancel the prohibition of starting the machine tool 1 and cancel the display of the warning message on the display unit 34. Further, the power cutoff history and the vibration history stored in the RAM 33 are erased, and this flow is finished.

  On the other hand, in step S160, it is determined whether there is a vibration history. As described above, the CPU 31 periodically reads the detection data from the vibration detection device 70 and stores it in the RAM 33 during normal times without power loss. Therefore, in this step S160, determination can be made based on whether or not the detection data of the RAM 33 has a vibration history.

  If there is no vibration history in the detection data of the RAM 33, the determination in step S160 is not satisfied, and this flow ends. If there is a vibration history in the detection data of the RAM 33, the determination at step S160 is satisfied, and the routine goes to step S170.

  In step S170, the vibration history in the RAM 33 is erased and initialized (since there is no power cut-off history and vibration due to short-term relocation such as rearrangement of the machine tool 1 or a simple earthquake is estimated). End the flow.

  Of the above flow, the procedure of step S110 constitutes the energization completion detection means described in each claim. Further, the procedure of step S130 and step S140 constitutes an activation restriction unit. The procedure of step S170 constitutes initialization means. Although the RAM 33 is used as the vibration history storage unit, the vibration detection device 70 may be provided with a storage unit.

  In this modification, the vibration detection device 70 detects the vibration of the machine tool 1, and even if there is a power shut-off history (the power supply has been stopped for a long time) but no vibration is detected, the activation restriction Do not add. As a result, it is possible to avoid a start restriction that is essentially unnecessary, such as when the power failure time is long, and to further improve the convenience for the operator.

It is a front view which shows the machine tool provided with one Embodiment of the power supply control apparatus of this invention. It is a perspective view which shows the machine main body of a machine tool. It is a block diagram which shows schematic structure of a power supply control apparatus. It is explanatory drawing which shows schematic structure of the power supply monitoring part provided in the power supply control apparatus of FIG. It is a flowchart which shows the control in the power supply control apparatus of FIG. It is explanatory drawing which shows schematic structure of the power supply monitoring part in the modification which provided SRAM in order to detect completion of electricity supply. It is explanatory drawing which shows schematic structure of the power supply monitoring part in the modification using the movement of an electrode in order to detect completion of electricity supply. It is explanatory drawing which shows the principal part of the power supply monitoring part in the modification which performs reset of electricity supply completion detection with a cylinder. It is a block diagram which shows schematic structure of the power supply control apparatus which added the vibration detection apparatus. It is a flowchart which shows the control in the power supply control apparatus of FIG.

Explanation of symbols

1 Machine tool 30 Power supply control device 31 CPU
33 RAM
34 Display unit 35 Input unit 38 First AC / DC converter 40 Power supply monitoring unit 41 First relay 42 Second relay 43 Second AC / DC converter 45 Capacitor (energization holding means)
50 SRAM
54 Electromagnet for Holding 55 Electromagnet for Reset 60 Electrode 62 Cylinder 70 Vibration Detection Device 71 Third Relay

Claims (10)

Energization holding means for holding energization as a substitute power source for a predetermined period when the main power supply voltage for supplying power to the machine tool is lost;
Energization completion detection means for detecting that energization by the energization holding means is completed after the loss of the main power supply voltage;
Power supply control for a machine tool, characterized by comprising start restriction means for giving a predetermined start restriction in the start of the machine tool when the power supply completion detection means detects that the power supply by the power supply holding means is completed apparatus. In the machine tool power supply control device according to claim 1,
Further comprising vibration detecting means for detecting vibration of the machine tool;
The activation restriction means includes
The power supply control device for a machine tool according to claim 1, wherein when the energization completion detecting unit detects that energization by the energization holding unit is completed, the activation restriction is given according to a detection result of the vibration detecting unit. In the machine tool power supply control device according to claim 2,
Vibration history storage means for storing that the vibration of the machine tool is detected by the vibration detection means;
The vibration history storage means when the completion of energization by the energization holding means is not detected by the energization completion detection means and when the vibration history storage means stores that the vibration of the machine tool is detected. A power control device for a machine tool, further comprising: initialization means for erasing information stored in the machine tool. In the machine tool power supply control device according to any one of claims 1 to 3,
A power control device for a machine tool, comprising voltage conversion means for converting the main power supply voltage into a voltage equivalent to an energization voltage that can be held by the energization holding means. In the power control device of the machine tool according to claim 4,
The energization holding means includes
A power supply control device for a machine tool, characterized in that it is a capacitor connected to the output side of the voltage conversion means so as to store the electric charge after the main power supply voltage is converted by the voltage conversion means. In the machine tool power supply control device according to any one of claims 1 to 5,
A relay having a switch that is in a closed state when the main power supply voltage or the energized voltage is supplied and is in an open state when neither the main power supply voltage nor the energized voltage is supplied;
The power supply control device for a machine tool, wherein the energization completion detection means detects the open state of the switch. The power control device for a machine tool according to claim 6,
The relay is
A power control device for a machine tool, comprising a switch opening / closing coil that is excited when the main power supply voltage or the energization voltage is supplied and drives the switch to a closed state. In the machine tool power supply control device according to any one of claims 1 to 5,
Volatile information that stores and holds predetermined information when the main power supply voltage or the energized voltage is supplied, and loses the stored predetermined information when neither the main power supply voltage nor the energized voltage is supplied. A storage means;
The power supply control device for a machine tool, wherein the energization completion detection means detects a loss state of the predetermined information in the storage means. In the machine tool power supply control device according to any one of claims 1 to 5,
A moving body that is located at the first position when the main power supply voltage or the energization voltage is supplied, and moves to the second position when neither the main power supply voltage nor the energization voltage is supplied;
The power supply control device for a machine tool, wherein the energization completion detection means detects that the moving body is in the second position. The power control device for a machine tool according to claim 9,
The moving body is composed of electrodes,
A power supply control device for a machine tool, comprising: an electrode moving coil that excites the movable body at the second position when the main power supply voltage or the energized voltage is supplied and drives the movable body to the first position.

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