JP5312867B2 - Electric winding device - Google Patents

Description

  The present invention relates to an electric hoisting and lifting device such as an electric chain block and an electric hoist, and in particular, setting and releasing upper and lower limits of hoisting and lowering and setting and releasing various functions for setting and releasing light load high speed operation are performed by operating the operation unit. It is related with the electric winding up-and-down apparatus which can be implemented easily and safely.

In this type of electric hoisting / lowering device, if the upper limit position and the lower limit position are not provided at the hoisting / lowering position of the load, there is a risk of the load colliding with other objects due to overloading or lowering of the load. The upper limit position of the hoisting and the lower limit position of the lowering are set in advance, and the hoisting and lowering of the load cannot be performed beyond the upper limit position and the lower limit position. There are two methods for setting the upper and lower limit positions: a mechanical method and an electronic method. As a mechanical setting method, there is a method using a gear limit, and as an electronic setting method, there is a method using an encoder type gear limit. In addition, in the microprocessor control hoist described in Patent Document 1, there is a type in which the upper limit position and the lower limit position are set by a combination of button switches of the pendant control station.
Japanese Patent Laid-Open No. 61-23100

  In the conventional method of setting the upper limit and lower limit positions, there is a possibility that malfunction may occur, which is dangerous. Further, in order to set and cancel, it is necessary to perform the setting work by climbing to the position of the hoisting / lowering apparatus main body, and there is a problem that the work is difficult and at the same time dangerous. In addition, the technique described in Patent Document 1 also has a problem that it moves after setting and becomes a mistake, or it is a dangerous operation because it is set manually.

  The present invention has been made in view of the above points, and provides an electric hoisting / lowering device in which upper and lower limit position setting and light load high speed setting can be easily and safely set by operating a push button switch of an operation unit at hand. With the goal.

  In order to solve the above problems, the present invention includes an operation unit including an emergency stop switch and a push button switch, an inverter, a control unit including a microcomputer built in the inverter or independent of the inverter, and a winding up / down motor. Control the inverter via the control unit by operating the pushbutton switch on the operation unit, control the start-up operation of the hoisting and lowering motor, and continue to supply power to the control unit while making use of the control function of the control unit, emergency stop This is an electric hoisting and lifting device with a safety function that cuts off the drive power from the inverter to the hoisting and lowering motor by turning on or off the operation switch, and the hoisting and lowering motor is started by turning on or off the emergency stop switch. In addition to the operation control mode for operation control, the mode is set to the function setting mode for setting various functions of the control unit by turning OFF or ON. Comprising a de setting means, the mode setting means and function setting mode, and sets various functions through operation of the push button switch of the operation unit.

  Further, the present invention provides the above-described electric hoisting and lowering apparatus, further comprising a hoisting and lowering distance measuring means for measuring a hoisting distance and a lowering distance from a predetermined position, and starting the hoisting and lowering motor with the mode setting means as the operation control mode. After driving to the desired hoisting upper limit or lowering lower limit by the operation control, the mode setting means is set to the function setting mode, and the distance or lowering to the hoisting upper limit measured by the hoisting vertical distance measuring means by operating the push button switch of the operation unit The distance to the lower limit is set as a hoisting upper limit or a lowering lower limit.

  Further, the present invention is characterized in that, in the above-described electric winding and lifting apparatus, the mode setting means is set to a function setting mode, and light load high-speed winding up and down is set by operating a push button switch of the operation unit.

According to the present invention, the operation setting mode in which the hoisting and lowering motor is set to start-up operation control by ON or OFF operation of the emergency stop switch, and the function setting mode in which various functions of the control unit are set by OFF or ON operation; The mode setting means is provided, the mode setting means is set to the function setting mode, and various functions are set by the operation of the push button switch of the operation unit. Therefore, the following excellent effects can be obtained.
(1) The malfunction can be prevented and the safety is improved.
(2) Various functions can be easily set / released by operating the push button switch of the hand control unit.
(3) Various functions can be set with a standard operation unit without increasing the number of pushbutton switches on the operation unit.
(4) Improvement of safety and convenience can be realized without increasing costs.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a system configuration example of an electric winding and lifting apparatus according to the present invention. As shown in the figure, this electric winding and lifting apparatus includes an operation unit 1, an interface (I / F) unit 2, a control unit 3 including a microcomputer, an inverter 4, and an induction motor 5 for winding up and down. Reference numeral 6 denotes a three-phase AC power supply. Three-phase (RST) of the three-phase AC power supply 6 is supplied to the inverter 4 and a single-phase (RT phase in this case) AC power supply via the transformer 7 is connected to the interface (I / F) is supplied to the section 2. The interface (I / F) unit 2 is an interface that converts an AC signal into a DC signal. The interface (I / F) unit 2 receives the AC signal output from the operation unit 1, converts it to a DC signal, and converts it to the control unit 3 and the inverter 4. The converted DC signal is output. As will be described in detail later, the control unit 3 having a microcomputer responds to the winding and unwinding low / high speed commands from the operation unit 1 to the inverter 4 via the speed command signal line 19. , And the inverter 4 is controlled to change the frequency of the drive power supplied to the induction motor 5 to winding low speed / high speed, winding low speed / high speed, and the induction motor 5 is wound low speed / high speed and lowering speed / Drive at high speed.

  As shown in FIG. 2 (a), the operation unit 1 has a front push button switch 11, a lower push button switch 12, and an emergency stop switch 13 mounted (mounted) on the housing, as shown in front view in FIG. 2 (a) and side view in FIG. 2 (b). It is a configuration. Although not shown, the operation unit 1 is connected to a main body of an electric hoisting / lowering device including an induction motor 5 and a hoisting / lowering mechanism by a cable 8, and the electric hoisting / lowering device is operated by operating the operating unit 1 at hand. Can be driven. The hoisting push button switch 11 is a two-stage push button switch. The contact 11a is turned on by the first push operation, the hoisting low speed command signal UL is turned on, and the contact 11b is turned on by the second push operation. H is output to the interface (I / F) unit 2. The lowering pushbutton switch 12 is also a two-stage pushbutton switch. The contact 12a is turned on when the first step is pressed, and the contact 12b is turned on when the second step is operated. The command signal H is output to the interface (I / F) unit 2.

  The emergency stop switch 13 is provided with a push button. The push button is turned on by pressing the top of the push button (the normally closed contact is opened), and the push button pushed in by rotating the top of the push button is returned to the original state and turned off (the normally closed contact). The safety signal SA is output to the interface (I / F) unit 2 when turned on, and the safety signal SA is cut off when turned off. When the emergency stop switch 13 is turned ON (the normally closed contact is opened), the safety signal SA is output from the interface (I / F) unit 2 to the inverter 4 and the drive power supplied to the induction motor 5 is cut off. When the emergency stop switch 13 is turned ON (the normally closed contact is opened) from the inverter 4 via the RS422 communication line 18 to the control unit 3 having a microcomputer, the drive power to the induction motor 5 of the inverter 4 is increased. A signal indicating the interruption is output, and the control unit 3 switches from the operation control mode to the function setting mode as described in detail later.

  Note that the hoisting push button switch 11 and the hoisting push button switch 12 are configured so that the contacts 11a and 12a are kept ON in the second stage operation. Therefore, the control unit 3 determines whether the “winding” or “lowering” is based on the signals when the contacts 11a and 12a are turned on, that is, the winding low speed command signal UL and the winding low speed command signal DL. A three-phase (R, S, T) AC power supply 6 is input to the inverter 4, and three-phase (U, V, W) driving power is supplied from the inverter 4 to the induction motor 5. Although not shown, the inverter 4 includes a microcomputer. When the emergency stop switch 13 is turned on and the safety signal SA is input to the interface (I / F) unit 2, the safety signal SA is also input to the inverter 4. Is input, and the driving power supplied to the induction motor 5 is cut off. Even if the safety signal SA is input to the inverter 4 and the drive power supplied to the induction motor 5 is cut off, the microcomputer provided in the inverter 4 is operating, and the drive power to the induction motor 5 is reduced. The control function is operating normally only by being shut off.

  Reference numeral 14 denotes a rotary encoder, which rotates in conjunction with a rotating shaft of a hoisting / lowering mechanism for hoisting and lowering a rope or chain of an electric hoisting / lowering device main body driven by the induction motor 5, and the number of rotations of the rotating shaft A pulse proportional to the lowering distance is input to the control unit 3. That is, the microcomputer of the control unit 3 adds, for example, pulses from the rotary encoder 14 by forward rotation of the rotary shaft, and subtracts by reverse rotation, and the winding distance and lowering by the count value of the pulses from the rotary encoder 14. It is designed to detect distance. In addition, 15 is a resistor for regenerative braking, and 16 is a mechanical brake. The mechanical brake 16 is supplied with DC power via the rectifier 17 so that the mechanical brake 16 is released. When the DC power is cut off, the mechanical brake 16 operates and the rotation of the rotating shaft of the induction motor 5 and the winding up / down mechanism is performed. Is restrained.

  In the present invention, when the emergency stop switch 13 is turned on, that is, the safety signal SA is input to the inverter 4, the driving power supplied to the induction motor 5 is cut off, and the microcomputer provided in the inverter 4 Various functions such as a lowering lower limit position, a higher upper limit position, and a light load high-speed winding up and down are set using the fact that the motor 5 is operating normally except for the function of supplying driving power to the motor 5. That is, the drive power supplied to the induction motor 5 is cut off, and various functions are set using the state in which the winding mechanism is inoperable. In other words, the operation mode is set when the emergency stop switch 13 is OFF, and the setting mode is set when the emergency stop switch 13 is ON. Various operations can be performed by operating the hoisting push button switch 11 and the lowering push button switch 12 of the operation unit 1 in the setting mode. Is used to set the function. Hereinafter, a mode switching process by the emergency stop switch 13, a function setting process in the setting mode, and an operation control process in the operation mode will be described.

  FIG. 3 is a diagram showing a mode switching process flow by the emergency stop switch 13. First, in step ST1, it is determined whether or not the emergency stop switch 13 is ON. If YES, the setting mode is set in step ST2, and if NO, the operation mode is set in step ST3.

  For setting the hoisting upper limit position, the emergency stop switch 13 is turned off, that is, the operation mode is set, and the load lifting up / down hook is wound up to a desired hoisting position. In this state, the emergency stop switch 13 is turned on, that is, the setting mode is set, and the hoisting push button switch 11 of the operation unit 1 is operated in a predetermined procedure as described in detail later, so that the load hoisting vertical hook is hoisted. This position is set as the winding upper limit position (pulse count value from the rotary encoder 14). Also, the set hoisting upper limit position is released by operating the hoisting push button switch 11 in a predetermined procedure with the emergency stop switch 13 turned on as will be described in detail later.

  The lowering lower limit position is set by turning on the emergency stop switch 13, that is, in the setting mode, and lowering the load hanging up / down hook to a desired position. In this state, the emergency stop switch 13 is turned off, that is, the operation mode is set, and the unwinding push button switch 12 of the operation unit 1 is operated in a predetermined procedure as will be described in detail later to lower the load hanging up / down hook. Is set as the lower limit for lowering. The set lowering lower limit position is also released by operating the lowering push button switch 12 in a predetermined procedure.

  FIG. 4 is a diagram showing a processing flow for setting / canceling the winding upper limit position and setting / canceling the lowering lower limit position. First, the hoisting upper limit position is set by turning off the emergency stop switch 13 (operation mode) as described above and hoisting the load lifting up / down hook to a desired hoisting position. In this state, the emergency stop switch 13 is turned ON (setting mode). Subsequently, in step ST11, it is determined whether or not the hoisting push button switch 11 is turned on. If it is turned on, in step ST12, it is judged whether or not the hoisting push button switch 11 is pushed in two steps (high speed). If it is not pushed in two steps, it is determined in step ST13 whether the first push of the hoisting push button switch 11 is ON for 5 seconds continuously. If it is ON for 5 seconds continuously, the winding position is set to the upper limit position in step ST14. Set as (winding upper limit position). Further, when the upper limit position is released in step ST12 when the hoisting push button switch 11 is pushed in two steps (high speed), in step ST15, it is determined whether or not the pushing is continued for 5 seconds. If pushed, the upper limit position (winding upper limit position) set in step ST16 is canceled.

  The lowering lower limit position is set by turning on the emergency stop switch 13 (setting mode) as described above and lowering the load hanging up / down hook to a desired lowering position. In this state, the emergency stop switch 13 is turned off (operation mode). In step ST11, if the hoisting push button switch 11 is OFF, it is determined in step ST17 whether the hoisting push button switch 12 is ON. If it is ON, in step ST18, two steps of the lowering push button switch 12 are performed. It is determined whether or not it is pushed in (high speed), and if it is pushed in two steps, it is determined in step ST19 whether or not it is ON for 5 seconds continuously. If it is ON for 5 seconds continuously, the lower limit position (winding) is determined in step ST20. Release the lower limit position. If it is determined in step ST18 that the lowering push button switch 12 is not pushed in two steps, it is determined in step ST21 whether the lowering push button switch 12 is continuously ON for 5 seconds. In ST22, the lowering position is set as a lower limit position (lowering upper limit position).

  FIG. 5 is a diagram showing a processing flow of operation control in the operation mode. First, in step ST31, it is determined whether or not the hoisting push button switch 11 is ON. If it is ON, it is determined in step ST32 whether it is a two-step push-in (high speed). In step ST33, a winding low speed command is output. As a result, the low-speed driving power for the winding is output from the inverter 4 to the induction motor 5, and the hoisting / lowering apparatus is in the winding low-speed operation. If step ST32 is a two-stage push (high speed), a winding high speed command is output in step ST34. As a result, the high-speed driving power is output from the inverter 4 to the induction motor 5, and the hoisting / lowering device is in the high-speed driving operation.

  In step ST31, if the hoisting push button switch 11 is OFF, it is determined in step ST35 whether or not the hoisting push button switch 12 is ON. If it is ON, it is pushed in two steps (high speed) in step ST36. If it is two-stage push-in (high speed), a lowering high speed command is output in step ST37. As a result, the lowering high-speed driving power is output from the inverter 4 to the induction motor 5, and the lowering and lifting device is in the lowering high-speed operation. If the push-down switch 12 for lowering is not pushed in two steps (high speed) in step ST36, a lowering low speed command is output. As a result, the lowering drive power for the lowering speed is output from the inverter 4 to the induction motor 5, and the hoisting / lowering apparatus is in the lowering operation at the lower speed.

  As described above, the setting of the upper limit position, the release of the set hoisting upper limit position, the setting of the lowering lower limit position, and the release of the set lowering lower limit position are performed by the hoisting pushbutton switch 11 and the lowering pushbutton switch of the operation unit 1. 12 is performed in the predetermined procedure, but is performed with the emergency stop switch 13 in the ON state, that is, with the drive power supplied from the inverter 4 to the induction motor 5 cut off. Even if the 11 and the push-down switch 12 for lowering are operated, it is safe because the induction motor 5 does not operate. The setting of the hoisting upper limit position shown in FIG. 4, the release of the set hoisting upper limit position, the setting of the lowering lower limit position, the release pushbutton switch 11 for lowering and the lower pushbutton switch 12 for releasing the set lowering lower limit position The operation procedure is an example, and the operation procedure of the hoisting push button switch 11 and the lowering push button switch 12 is not limited to this.

  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. For example, although the processing flow is omitted, the emergency stop switch 13 is set to ON (setting mode), and the inching operation of the hoisting push button switch 11 is performed a predetermined number of times (for example, 10 times) so that the light load high speed setting is achieved. Then, by performing the inching operation of the lowering push button switch 12 for a predetermined number of times (for example, 10 times), the emergency stop switch 13 is turned ON (setting mode) so as to cancel the light load high speed setting, and is guided from the inverter 4 It is possible to safely implement various functions by operating the hoisting push button switch 11 and the lowering push button switch 12 of the operation unit 1 in a state where the supply of driving power to the electric motor 5 is interrupted.

  In the embodiment described above, an example is shown in which a microcomputer is provided in the control unit 3 and the above functions are set and released by the microcomputer. However, the microcomputer is provided in the inverter 4 without providing a microcomputer in the control unit 3. It may be performed by a microcomputer (with built-in inverter). Further, although the setting mode is set by turning on the emergency stop switch 13 and the operation mode is set by turning off the switch, the setting mode may be set by turning off the emergency stop switch 13 and the operation mode may be set by turning on the switch.

It is a figure which shows the system configuration example of the electric winding up-and-down apparatus which concerns on this invention. It is a figure which shows the general | schematic structure of the operation part of the electrically operated winding raising / lowering apparatus which concerns on this invention, (a) shows a front surface, (b) shows a side surface. It is a figure which shows the mode switching process flow by the switch for emergency stops of the electrically-driven winding raising / lowering apparatus which concerns on this invention. It is a figure which shows the processing flow of the winding upper limit position setting / cancellation and winding lower limit position setting / cancellation of the electric winding raising / lowering apparatus which concerns on this invention. It is a figure which shows the operation control processing flow of the electric winding up-and-down apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation part 2 Interface (I / F) part 3 Control part 4 Inverter 5 Induction motor 6 Three-phase alternating current power supply 7 Transformer 8 Cable 11 Push button switch for winding 12 Push button switch for lowering 13 Emergency stop switch 14 Rotary encoder 15 Regeneration Braking resistor 16 Mechanical brake 17 Rectifier 18 RS422 communication line 19 Speed command signal line

Claims (3)

An operation unit having an emergency stop switch and a push button switch, an inverter, a control unit having a built-in or independent microcomputer in the inverter, and a winding up / down motor,
By controlling the push button switch of the operation unit, the inverter is controlled via the control unit, the start-up operation control of the winding up / down motor is performed, and the control function of the control unit is continuously supplied to the control unit. An electric hoisting / lowering apparatus having a safety function that cuts off driving power from the inverter to the hoisting / lowering electric motor by ON or OFF operation of the emergency stop switch,
A mode in which a function setting mode in which various functions of the control unit are set by the OFF or ON operation is set in the operation control mode in which the hoisting and lowering motor is set in the start-up operation control by the ON or OFF operation of the emergency stop switch. Comprising setting means,
An electric winding up and down apparatus characterized in that the mode setting means is set to a function setting mode, and various functions are set by operating a push button switch of the operation unit. In the electric winding up and down device according to claim 1,
A winding up / down distance measuring means for measuring a winding distance and a lowering distance from a predetermined position is provided,
After the mode setting means is set to the operation control mode and the start / up operation control of the hoisting / lowering motor is operated to a desired hoisting upper limit or lowering lower limit, the mode setting means is set to a function setting mode and the push button switch of the operation unit The electric hoisting / lowering apparatus characterized by setting the distance to the hoisting upper limit or the distance to the hoisting lower limit measured by the hoisting / lowering distance measuring means as the hoisting upper limit or the lowering lower limit. In the electric winding up and down device according to claim 1,
The mode setting means is the function setting mode,
An electric winding up / down device characterized in that light load high-speed winding up / down is set by operating a push button switch of the operation unit.

Images