JP4850951B2 - Operation control device for electric equipment - Google Patents

Description

  The present invention relates to an operation control device for an electric device that controls operation stop of an electric device such as an electric hoist or an overhead traveling crane such as a hoisting / lowering electric motor or a traversing electric motor by a switch operation of a hand control switch box. is there.

  As an example of operating an electric device by a switch operation of a hand operation switch box, there are an electric hoist, an overhead traveling crane, and the like. FIG. 1 is a diagram showing a circuit configuration of a conventional operation control device for an electric motor for winding up and down an electric chain block. In FIG. 1, 10 is an induction motor for winding up and down, and 11 is a brake. The induction motor 10 for hoisting and lowering can supply three-phase AC power from a power supply circuit 15 through an electromagnetic switch 12 for opening and closing a power source and an electromagnetic switch 13 for hoisting or an electromagnetic switch 14 for lowering and lowering. . Further, DC power can be supplied to the brake 11 via the rectifier circuit 16.

  20 is a drive circuit for driving the electromagnetic switch 12, 21 is a hoisting control circuit, and 22 is a hoisting control circuit. Reference numeral 30 denotes a hand operation switch box. The hand operation switch box 30 is provided with an emergency stop push button switch 31, a power-on push button switch 32, a hoisting push button switch 33, and a lowering push button switch 34. Yes.

  In the drive circuit 20, the drive coil 12X of the electromagnetic switch 12, the normally closed contact 31b of the emergency stop push button switch 31, and the normally open auxiliary contact 12a of the electromagnetic switch 12 are connected in series. A normally open contact 32a is connected in parallel to the series circuit of the normally closed contact 31b and the normally open auxiliary contact 12a. The hoisting control circuit 21 is configured by connecting a normally open contact 33a of the hoisting pushbutton switch 33 and a drive coil 13X of the hoisting electromagnetic switch 13 in series. The stop push button switch 31 is connected in series with the normally closed contact 31b. The lowering control circuit 22 includes a normally open contact 34a of the lowering pushbutton switch 34 and a drive coil 14X of the lowering electromagnetic switch 14, which are connected in series. The stop push button switch 31 is connected in series with the normally closed contact 31b.

  A transformer 23 is connected to the primary side of the ST phase (for example, 200 V) of the power supply circuit 15, and a predetermined (for example, 24 V) AC voltage is output from the secondary side, and the drive circuit 20 and the hoisting control circuit 21. , And the control circuit 22 for lowering. Reference numeral 24 denotes a fuse.

  In the operation control device for the winding up / down motor, when the power-on pushbutton switch 32 is pressed and the normally open contact 32a is closed, a drive current flows through the drive coil 12X of the electromagnetic switch 12, and the electromagnetic switch 12 is operated and closed. At the same time, the normally open auxiliary contact 12a is closed and the closing operation of the electromagnetic switch 12 is self-held. In this state, when the hoisting pushbutton switch 33 is pressed and the normally open contact 33a is closed, a driving current flows through the driving coil 13X of the hoisting electromagnetic switch 13, and the hoisting electromagnetic switch 13 is closed. The induction motor 10 is supplied with hoisting drive power, and the hoisting / lowering induction motor 10 rotates (forward) in the winding direction. Further, when the lowering push button switch 34 is pressed and the normally open contact 34a is closed, a driving current flows through the driving coil 14X of the lowering electromagnetic switch 14, the lowering electromagnetic switch 14 is closed, and the lowering induction is guided. The lowering drive power is supplied to the electric motor 10, and the lower and upper induction motor 10 rotates (reverses) in the lowering direction.

  In the operation controller for the hoisting and lowering motor, the power supply to the power supply circuit 15 is interrupted when a power failure occurs. At the time of power failure recovery, the normally closed contact 31b of the emergency stop pushbutton switch 31 of the local operation switch box 30 is closed, but the normally open auxiliary contact 12a of the electromagnetic switch 12 is open, so that the drive coil 12X has a drive current. Does not flow. Even if the hoisting pushbutton switch 33 and the lowering pushbutton switch 34 are pressed in this state, a driving current flows through the driving coil 13X of the hoisting electromagnetic switch 13 and the driving coil 14X of the hoisting electromagnetic switch 14, Even when the electromagnetic switch 13 for winding and the electromagnetic switch 14 for lowering are closed, the electromagnetic switch 12 is open, so that driving power is not supplied to the induction motor 10 for vertical winding.

  When the power-on pushbutton switch 32 is pressed in this state and the normally open contact 32a is closed, the drive current flows through the drive coil 12X of the electromagnetic switch 12 as described above, and the electromagnetic switch 12 is closed and its normally open assist is closed. Since the contact 12a is closed, the drive current continues to flow to the drive coil 12X through the normally open auxiliary contact 12a and the normally closed contact 31b of the emergency stop push button switch 31, and the closing operation of the electromagnetic switch 12 is self-maintained. In this state, the hoisting push button switch 33 or the lowering push button switch 34 is pressed to pass a driving current through the driving coil 13X of the hoisting electromagnetic switch 13 or the driving coil 14X of the lowering electromagnetic switch 14. When the hoisting electromagnetic switch 13 or the lowering electromagnetic switch 14 is closed, the hoisting / lowering induction motor 10 is supplied with hoisting power or lowering power and rotated in the hoisting direction or the lowering direction. To do.

  In the operation controller for the hoisting and lowering motor, a power-on pushbutton switch 32 is provided in the hand operation switch box 30 in order to enable operation of the hoisting and lowering motor when a power failure is recovered. Since the power-on pushbutton switch 32 is a pushbutton switch different from the emergency stop pushbutton switch 31, the hoisting pushbutton switch 33, and the lowering pushbutton switch 34, the hand operation switch box 30 is enlarged and operated. Was bad. In addition, after pressing the emergency stop pushbutton switch 31 during normal operation, the emergency stop pushbutton switch 31 must be released (reset), and then the power-on pushbutton switch 32 must be pressed further. Was cumbersome. In addition, even if the emergency stop push button switch 31 is released, if the hoisting / lowering induction motor 10 does not operate, the push button switch of the hand operation switch box 30 may be pushed indefinitely, and as a result, the machine may start carelessly. It was.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an operation control device for an electric device that is excellent in operability without increasing the size of a hand-operated switch box.

  In order to solve the above-described problems, the present invention provides an electric device, a power supply circuit that supplies driving power to the electric device, an electromagnetic switch that opens and closes the power supply circuit, and a drive current that is supplied to a drive coil of the electromagnetic switch. Provided with an electromagnetic switch drive circuit to be shut off and a hand operation switch box having an emergency stop switch, the operation of the electric device is stopped via the control circuit by the switch operation of the hand operation switch box, and the electromagnetic switch drive circuit An operation control device for an electric device that opens an electromagnetic switch by opening a normally closed contact of an emergency stop switch inserted in series, and opens the normally closed contact to the emergency stop switch of the hand control switch box. A power-on relay having a self-holding circuit that operates when the normally open contact is closed and self-holds the operation while providing a normally open contact that is closed by operation Provided, characterized in that the insertion of the normally open contact of the relay to the normally closed contact in series with emergency stop switches electromagnetic switch driving circuit.

  As described above, the emergency stop switch of the hand control switch box is provided with a normally open contact that is closed by opening a normally closed contact, and a self-holding circuit that operates when the normally open contact is closed and that self-holds the operation. The power switch relay is provided and the normally open contact of the power switch relay is inserted into the electromagnetic switch drive circuit in series with the normally closed contact of the emergency stop switch. When the power is restored when the electromagnetic switch is open due to a power failure, the relay operates and self-holds only by pressing the emergency stop switch, and the electromagnetic switch is driven. Close the normally open contact inserted in series with the normally closed contact of the emergency stop switch in the circuit. After that, the emergency stop switch is rotated by a predetermined amount in the predetermined direction and reset to close the normally closed contact of the emergency stop switch, so that the electromagnetic switch is closed, and then the electric device is operated by the switch operation of the hand control switch box. Can be shut down.

  Further, in the operation control apparatus for an electric device according to the present invention, the emergency stop switch is a push button switch, the normally closed contact is opened by the pressing operation, the normally open contact is closed and this state is maintained, and then the predetermined direction is maintained. It is characterized in that it is reset by rotating it by a predetermined amount.

  When the emergency stop switch is configured as described above, after the emergency stop switch is pressed, the electromagnetic switch is turned on if the power supply circuit is supplied with power by simply rotating it in a predetermined direction and resetting it. Since the closed state is maintained, the operation of the electric device can be stopped by the switch operation of the local operation switch box.

  According to the present invention, in the operation control apparatus for an electric device described above, the electric device is an electric motor for hoisting and lowering an electric hoist, and the control circuit lowers and raises the electric motor for hoisting and lowering by a switch operation of the hand operation switch box. It has a function of stopping operation in the direction.

  By using the operation control device for the operation control of the hoisting and lowering motor of the electric hoist as described above, for example, when the electromagnetic switch is in an open state before the operation is started, or when the electromagnetic switch is opened due to a power failure. When power is restored while in the state, the hoisting / lowering operation of the hoisting / lowering motor of the electric hoisting machine can be stopped only by pressing the emergency stop switch.

  According to the present invention, in the operation control apparatus for an electric device described above, the electric hoist includes a traversing motor for traversing the electric hoist, and the control circuit traverses the traversing electric motor by a switch operation of a local operation switch box. It further has a function of stopping operation in the direction.

  By using the operation control device for the operation control of the traverse motor of the electric hoist as described above, for example, when the electromagnetic switch is in an open state before the operation starts, or the electromagnetic switch is in an open state due to a power failure When power is restored when the power is turned off, simply press the emergency stop switch and stop the hoisting / lowering operation of the hoisting / lowering motor of the electric hoisting machine and the transverse operation of the traversing motor by operating the switch of the operation switch box. A stop can be made.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, although this embodiment demonstrates the operation control apparatus which operates the induction motor for winding up / down of an electric chain block as an electric equipment with a hand operation switch box, the operation control apparatus of this invention controls with a hand operation switch box. If it is a thing, it can be used for the operation control apparatus of various electric equipment. FIG. 2 is a diagram showing a circuit configuration of an operation control apparatus for an electric device according to the present invention. 2, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  This operation control device is different from the operation control device shown in FIG. 1 in that a normally open contact 31a that is closed by opening operation (pressing operation) of the normally closed contact 31b of the emergency stop push button switch 31 of the hand operation switch box 30 is provided. The power-on relay 25a-1 of the power-on relay 25 is closed by connecting the drive coil 25X of the power-on relay 25 (not shown) in series with the normally-open contact 31a. The self-holding circuit 27 that maintains the operation of 25 is provided. The normally open contact 25a-2 of the power-on relay 25 is inserted and connected to the drive circuit 20 and the emergency stop push button switch 31 in series with the normally closed contact 31b. When the normally-open contact 31a of the emergency stop push-button switch 31 is opened (pressed), the drive current flows through the drive coil 25X when the normally-open contact 31a is closed. The drive current continues to flow from 27 to the drive coil 25X, and the power-on relay 25 continues to operate.

  The emergency stop push button switch 31 has a configuration in which the normally closed contact 31b is opened by a pressing operation, the normally open contact 31a is closed to be in a latched state, and then reset by rotating a predetermined amount in a predetermined direction (for example, right direction). Switch. Therefore, when the emergency stop push button switch 31 is pressed, the normally open contact 31a is closed and the power-on relay 25 is in a self-holding state, and then the emergency stop push button switch 31 is rotated by a predetermined amount in a predetermined direction to be reset. Since the normally closed contact 31b is closed, the drive current flows to the drive coil 12X through the normally closed contact 31b and the normally open contact 25a-2 of the power-on relay 25, and the electromagnetic switch 12 is closed. As a result, the hoisting / lowering induction motor 10 can be moved up and down by operating the hoisting push button switch 33 and the hoisting push button switch 34 of the hand operation switch box 30. This state continues until the normally closed contact 31b of the emergency stop push button switch 31 is opened (pressed).

  When the hoisting pushbutton switch 33 is pushed with the electromagnetic switch 12 closed as described above and the normally open contact 33a is closed, a driving current flows through the driving coil 13X of the hoisting electromagnetic switch 13, The electromagnetic electromagnetic switch 13 is closed, and the hoisting / lowering induction motor 10 is supplied with the hoisting / lowering induction motor 10, and the hoisting / lowering induction motor 10 rotates (forward). Further, when the lowering push button switch 34 is pressed and the normally open contact 34a is closed, a driving current flows through the driving coil 14X of the lowering electromagnetic switch 14, the lowering electromagnetic switch 14 is closed, and the lowering induction is guided. Driving electric power for lowering is supplied to the electric motor 10, and the lower and upper induction motor 10 rotates (reverses) in the lowering direction.

  In the operation controller for the hoisting and lowering motor, the power supply to the power supply circuit 15 is interrupted when a power failure occurs. At the time of power failure recovery, the normally closed contact 31b of the emergency stop push button switch 31 of the local operation switch box 30 is closed, but the power-on relay 25 is inoperative and the normally open contact 25a-2 is open. The electromagnetic switch 12 remains open. Therefore, even if the hoisting push button switch 33 and the lowering push button switch 34 of the hand operation switch box 30 are operated in this state, the hoisting / lowering operation of the hoisting / lowering induction motor 10 cannot be performed. The normally open contact 31a is closed by a pressing operation of the emergency stop push button switch 31, and is reset by rotating a predetermined amount in the predetermined direction. When the normally open contact 31a is closed, a drive current flows through the drive coil 25X of the power-on relay 25 and operates to self-hold. Since the normally open contact 25a-2 is closed and the normally closed contact 31b of the emergency stop push button switch 31 is also closed, a drive current flows through the drive coil 12X of the electromagnetic switch 12, and the electromagnetic switch 12 is closed. . Thus, as described above, the hoisting / lowering operation of the hoisting / lowering induction motor 10 can be performed by operating the hoisting pushbutton switch 33 and the lowering pushbutton switch 34 of the hand operation switch box 30.

  In this state, when the hoisting pushbutton switch 33 is pressed, the normally open contact 33a is closed, the drive current flows through the drive coil 13X of the hoisting electromagnetic switch 13, the hoisting electromagnetic switch 13 is closed, The induction motor 10 is supplied with hoisting power and rotates in the hoisting direction (forward rotation direction). Further, when the lowering push button switch 34 is pressed, the normally open contact 34a is closed, the driving current flows through the driving coil 14X of the lowering electromagnetic switch 14, the lowering electromagnetic switch 14 is closed, and the lowering up / down induction The electric power for lowering is supplied to the electric motor 10 and rotates in the lowering direction (reverse rotation direction).

  In the operation control apparatus as described above, by providing the normally-stop contact 31a, the power-on relay 25, the self-holding circuit 27, and the like on the emergency stop push button switch 31 of the hand operation switch box 30, the winding up / down induction motor 10 is provided. Even when the emergency stop is performed or when the power is turned on, the operation can be performed easily by operating the single emergency stop push button switch 31. Compared with the conventional operation control device shown in FIG. Since it is not necessary to provide the power-on pushbutton switch 32 separately from the emergency stop pushbutton switch 31, the hand operation switch box 30 can be downsized. Further, since the winding up / down operation of the winding up / down induction motor 10 can be performed immediately after the emergency stop push button switch 31 is reset, the operability is greatly improved.

  FIG. 3 is a diagram showing an external configuration example of an electric chain block that uses an operation control device for a hoisting and lowering motor. Reference numeral 40 denotes an electric chain block main body. The electric chain block main body includes a chain winding / rewinding mechanism (sprocket or the like) for winding and lowering the chain 41, a winding up / down induction motor 10, a brake 11, and a hand operation switch box 30. The above-described operation control device and the like are stored. A load lifting hook 42 is attached to the chain 41, and the electric chain block main body 40 can be attached to a predetermined mounting position on the ceiling, for example, by a hanging hook 43. The chain 41 that has been wound and unwound by the chain winding and rewinding mechanism is stored and fed out in a chain storage bucket 44. The hand operation switch box 30 is connected to the electric chain block main body 40 via a cable 45.

  By operating the emergency stop push button switch 31 provided in the hand operation switch box 30, the emergency up and down of the winding up / down induction motor 10 can be turned on, and the operability is greatly improved. Further, since there is no need to provide a power-on pushbutton switch, the hand operation switch box 30 can be miniaturized as described above, and the operability is greatly improved.

  In the above example, the operation control device used for operation control of the induction motor for winding up and down of the electric chain block has been described. However, the operation control device according to the present invention is not limited to the electric chain block, and an electric rope hoist or the like. Available to: Further, for example, it can be widely used for operation control of a hoisting / lowering electric motor and a traversing electric motor of an overhead traveling crane, and further for operation control of an electric device that performs operation control by operating a hand control switch box.

  FIG. 4 is a view showing an appearance of an example of the emergency stop push button switch 31 provided in the hand operation switch box 30. As shown in the figure, by pressing the pressing portion 35, the pressing portion 35 is pressed by the stroke S, whereby the normally closed contact 31b is opened and at the same time the normally open contact 31a is closed, and this state is maintained. When the pressing portion 35 is rotated in a predetermined direction (for example, rightward) by a predetermined amount in the pushed (push lock method) state, the locked state is released (reset), and the normally closed contact 31b is closed and at the same time the normally open contact 31a becomes an open state (turn reset system). In addition, 36 is a terminal of the normally closed contact 31b, and 37 is a terminal of the normally open contact 31a.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are achieved.

  The present invention provides a power-on relay having a self-holding circuit that is provided with a normally-open contact that is closed by an operation of opening a normally-closed contact on an emergency stop switch of a hand-operated switch box, and that self-holds when the normally-open contact is closed. Since the normally open contact of the power-on relay is inserted in series with the normally closed contact of the emergency stop switch in the electromagnetic switch drive circuit, there is no need to provide a power-on switch in the local operation switch box. If the switch box can be made small and the electromagnetic switch is open before the operation starts, or if the power is restored when the electromagnetic switch is open due to a power failure, only the emergency stop switch is operated. The electromagnetic switch can be closed and maintained in this way, and then the operation of the electric device can be stopped by the switch on the hand operated switch box. , Operability is greatly improved. Therefore, it can be widely used for operation control of electric equipment that performs operation control by switch operation of a hand-operated switch box such as an electric chain block and a hoisting and lowering motor such as an electric rope hoist, and a traversing electric motor for an overhead traveling crane. .

It is a figure which shows the circuit structure of the operation control apparatus of the motor for winding up / down of the conventional winding machine. It is a figure which shows the circuit structure of the operation control apparatus of the motor for winding up / down of the winding machine of this invention. It is a figure which shows the external appearance structural example of an electric chain block. It is a figure which shows the example of an external appearance of the pushbutton switch for emergency stops provided in a hand operation switch box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Winding up and down induction motor 11 Brake 12 Electromagnetic switch 12X Driving coil 13 Hoisting electromagnetic switch 13X Driving coil 14 Lowering electromagnetic switch 14X Driving coil 15 Power supply circuit 16 Rectifier circuit 20 Driving circuit 21 Hoisting control circuit 22 Control circuit for lowering 23 Transformer 24 Fuse 25a-1 Normally open contact 25a-2 Normally open contact 27 Self-holding circuit 30 Hand-operated switch box 31 Emergency stop push button switch 31a Normally open contact 31b Normally closed contact 33 For winding Pushbutton switch 33a Normally open contact 34 Push-down switch 34a for lowering Normally open contact

Claims (4)

An electric device, a power supply circuit that supplies driving power to the electric device, an electromagnetic switch that opens and closes the power supply circuit, an electromagnetic switch drive circuit that cuts off a drive current to a drive coil of the electromagnetic switch, A hand operated switch box having a stop switch is provided.
The operation of the electric device is stopped via a control circuit by a switch operation of the hand operation switch box, and the normally closed contact of the emergency stop switch inserted in series in the electromagnetic switch driving circuit An operation control device for an electric device that opens an electromagnetic switch,
A power supply having a normally open contact that is closed by opening the normally closed contact on the emergency stop switch of the hand operated switch box, and a self-holding circuit that operates when the normally open contact is closed and that self-holds the operation An operation control device for an electric device, characterized in that a closing relay is provided, and a normally open contact of the relay is inserted into the electromagnetic switch drive circuit in series with a normally closed contact of the emergency stop switch. The operation control apparatus for an electric device according to claim 1,
The emergency stop switch is a push button switch, and the normally closed contact is opened by a pressing operation, the normally open contact is closed and maintained in this state, and then reset by rotating a predetermined amount in a predetermined direction. An operation control device for an electric device, characterized in that In the operation control apparatus of the electric equipment according to claim 1 or 2,
The electric device is a motor for winding up and down of an electric hoist,
The operation control device for an electric device, wherein the control circuit has a function of stopping the operation of the hoisting / lowering motor in a hoisting / lowering direction by a switch operation of the hand operation switch box. The operation control apparatus for an electric device according to claim 3,
The electric hoist includes a traverse motor for traversing the electric hoist,
The operation control device for an electric device, wherein the control circuit further has a function of stopping the operation of the electric motor for traversing in the traversing direction by a switch operation of the hand operation switch box.

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