JP2009029589A - Operation control device and operation control method of hoisting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation control device and an operation control method of a hoisting machine, without tripping an inverter, by restraining an overcurrent flowing in an electric motor from the inverter, when the electric motor reverses, even if there is reverse operation for issuing a rising operation command in lowering speed reduction operation. <P>SOLUTION: This operation control device of the hoisting machine has an inverter electric motor, and is provided with a brake operation means for braking the electric motor by operating a brake for a predetermined time T, when switching to rising operation, after becoming a predetermined low speed by decelerating at predetermined deceleration, when there is ON (the time t3) of the rising operation command from an operation part in speed reduction at the predetermined deceleration by OFF (the time t1) of a high speed lowering operation command in inverter control, and restrains the overcurrent of the inverter by compensating for low torque of the electric motor in an extremely low operation area in reversal by brake force. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an operation control device for a hoisting machine in which an electric motor for hoisting and lowering is driven by an inverter, and an operation control method, and in particular, an operation unit includes a pushbutton switch for raising and a pushbutton for lowering, The present invention relates to an operation control device and an operation control method for a hoisting machine in which an overcurrent does not flow and trip even if an upward push button switch is operated during a descending operation.

  In recent years, a hoisting machine such as an electric chain block or an electric rope hoist driven by an inverter is often used. This type of hoisting machine normally supplies ascending drive power and descending drive power from an inverter to an electric motor (induction motor) by an ascending command and a descending command from an operation box having a push button switch for ascending and a push button switch for descending. The electric motor is operated in the upward direction (forward rotation) and the downward direction (reverse rotation), and is further accelerated / decelerated. In addition, the ascending pushbutton switch and the descending pushbutton switch of the operation box are often configured to have a two-stage push-in configuration, and the first stage is low speed and the second stage is high speed and two stage speed control. In addition, there are some which can be controlled at a continuously variable speed by the push amount of the push button switch.

In the two-stage speed control, there is a case where the reverse operation is performed from the descending operation to the ascending operation by operating the push button switch of the operation box. The reversing operation includes the following four operations.
(1) When an ascending low speed operation command is issued during descending low speed operation (2) When an ascending high speed operation command is issued during descending low speed operation (3) When an ascending low speed operation command is issued during descending high speed operation (4) Lowering high speed operation When issuing an ascending high-speed operation command during operation Since the inverter has an acceleration / deceleration time set in advance, the speed changes at the specified acceleration / deceleration as shown in FIG. .

In the hoisting machine, as shown in FIG. 1, during the descent high speed operation by the high speed descent operation command H _D (second stage pushing operation) of the descent pushbutton switch, at time t1, the low speed descent operation command L _D (1 step issues a eyes pushed), the inverter starts to decelerate until the speed of the slow down operation command L _D at a predetermined deceleration. When subsequently at time t2 produce fast rising operation command H _U by a two-stage push-rise pushbutton switch, inverter and the minimum lowering speed F _LD supplies power frequency to decelerate at a predetermined deceleration to the motor Thereafter, the period (phase) of the output frequency to the electric motor is reversed at time t3. At this time, the torque of the motor decreases in the inversion region of the inversion operation (in the vicinity of the inverter output frequency of 0 Hz). Therefore, the inverter increases the current to generate a large torque, resulting in an overcurrent. If the inverter capacity is not sufficient, the inverter trips due to the self-protection function and the motor stops.

  There is a measure to increase the capacity of the inverter in order to avoid the inverter from tripping due to the overcurrent in the reversal region (inverter output frequency 0 Hz) of the reversal operation by the reversal operation of the pushbutton switch as described above. There is a problem that becomes high. In addition, the use of an inverter having a large capacity increases the size, which is an obstacle to downsizing the hoist.

  The present invention has been made in view of the above-described points, and does not use a large-capacity inverter, and without increasing the number of components, the inversion operation is canceled and the inversion operation command is issued during the downward deceleration operation. An object of the present invention is to provide an operation control device and an operation control method for a hoisting machine that suppresses an overcurrent flowing from the inverter to the electric motor when the electric motor is reversed and does not trip the inverter.

  In order to solve the above-described problems, the present invention includes a motor for winding up and down, an inverter that supplies driving power to the motor, and an inverter control unit that controls the inverter, and the control unit controls the inverter by an operation command from the operation unit. The inverter control unit accelerates to a predetermined high speed with a predetermined acceleration by turning on a high speed lowering operation command from the operation unit. When the descent operation command is turned OFF, the vehicle decelerates to the minimum descent speed at a predetermined deceleration. When the high speed ascending operation command is turned ON, the vehicle accelerates to a predetermined high speed. When the high speed ascending operation command is turned OFF, the minimum ascending speed is reached. Acceleration / deceleration means for supplying electric power of a frequency that decelerates to an electric speed from the inverter to the motor, When the ascending operation command is ON while decelerating to the lowest descending speed, when decelerating from the descending operation to the ascending operation by decelerating to the predetermined low speed with the predetermined deceleration, the brake is applied from the time when the speed is decelerated to the predetermined low speed until the reversal time. And brake actuating means for braking the electric motor.

  As described above, when the braking operation means of the inverter control unit operates the high-speed descending operation command and the high-speed descending operation command is turned OFF and the ascending operation command is ON during deceleration to the minimum descending speed, the predetermined deceleration is applied. When decelerating to a predetermined low speed and switching to reverse operation from descending operation to reverse operation, the brake compensates for the torque shortage of the motor by operating the brake from the time of deceleration to the predetermined low speed until the reversal time to brake the motor. Thus, the overcurrent flowing from the inverter to the electric motor is suppressed and the trip of the inverter can be prevented, so that it is not necessary to increase the capacity of the inverter.

  In the hoisting machine operation control device according to the present invention, the predetermined low speed is a minimum lowering speed, and the inverter control unit performs reversal at a time when a predetermined time has elapsed from a time when the inverter is decelerated to the minimum lowering speed. Operates the brake for the predetermined time.

  Further, in the hoisting machine operation control apparatus according to the present invention, the predetermined low speed is a predetermined speed before reaching the minimum lowering speed, and the inverter control unit performs inversion at a time when the minimum lowering speed is reached, The brake operating means operates the brake from the time when the predetermined low speed is reached until the reverse time.

  Further, according to the present invention, in the above-described hoisting machine operation control device, the operation unit includes an ascending push button switch for issuing a high speed ascending operation command and a low speed ascending operation command, and a descending push button switch for issuing a high speed descending operation command and a low speed descending operation command. It has.

  As described above, when the operating unit is equipped with an ascent pushbutton switch and a descending pushbutton switch, the ascending operation can be performed by operating the ascending pushbutton switch while decelerating at a predetermined deceleration rate by turning off the fast descending command during the high speed descending operation. The command may be turned ON. In this case, electric power having a predetermined deceleration frequency is supplied from the inverter to the electric motor, and the motor is reversed to the ascending operation after reaching the minimum lowering speed. Therefore, the torque of the electric motor decreases in this low speed region. The inverter tries to flow a large current to the motor to compensate for the low torque, and it becomes overcurrent, but here the brake actuating means actuates the brake, so that the brake compensates for the shortage of torque of the motor, Overcurrent flowing from the inverter to the motor can be suppressed.

  The present invention also includes an electric motor for winding up and down, an inverter that supplies driving electric power to the electric motor, and an inverter control unit that controls the inverter, and the control unit controls the inverter in accordance with an operation command of the operating unit to raise the electric motor. This is an operation control method for a hoisting machine that performs operation and descending operation, and accelerates to a predetermined high speed at a predetermined acceleration by turning on a high speed descending operation command from the operation unit, and at a predetermined deceleration by turning off the high speed descending operation command. Decelerates to the lowest descent speed, accelerates to a predetermined high speed with a predetermined acceleration by turning on the high speed ascending operation command, and turns off the electric power of the frequency that decelerates to the predetermined minimum ascending speed with a predetermined deceleration by turning off the high speed ascending operation command. Supplied to the motor, and during the operation of the high-speed descent operation command, the high-speed descent operation command is turned OFF and the ascending operation command is turned ON while decelerating to the minimum descent If there is, when decelerating to a predetermined low speed with a predetermined deceleration and switching from descending operation to ascending operation and reversing, the brake is operated from the time of deceleration to the predetermined low speed until the reversal time to brake the motor. To do.

  As described above, when the high-speed descending operation command is turned on and the high-speed descending operation command is turned off, the deceleration is reduced to the minimum lowering speed. When switching from descending operation to ascending operation and reversing, operating the brake from the time of deceleration to a predetermined low speed to the reversal time to brake the motor, the brake compensates for the lack of torque of the motor. Overcurrent supplied to the inverter is suppressed, and tripping of the inverter can be prevented.

  According to the present invention, when the high speed or low speed ascending operation command is turned ON while the high speed descending operation command is turned OFF and the high speed or low speed ascending operation command is ON during deceleration with the predetermined deceleration, the speed is reduced to the predetermined low speed. Therefore, when switching to ascending operation, the brake is applied to the motor for a predetermined period of time to suppress the overcurrent and prevent the inverter from tripping. A high and inexpensive hoisting machine can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing a configuration example of an operation control device for a hoist according to the present invention. Here, the electric chain block is described as an example of the hoisting machine, but the hoisting machine is not limited to the electric chain block, and may be an electric rope hoist, for example. The operation control device 1 includes an operation box 2, a control device 3, and an inverter 4. Three-phase (R phase, S phase, T phase) AC power (for example, 200 V commercial power of 50 Hz or 60 Hz) is input to the inverter 4 via the power supply line 5, and the rise from the control device 3 (low speed, high speed) ) In response to a command and a descent (low speed, high speed) command, three-phase (U-phase, V-phase, W-phase) AC drive power is rolled up and down from the inverter 4 through control of an inverter control unit (not shown) provided in the inverter 4 The electric motor 6 is supplied. As a result, the electric motor 6 rotates forward (upward) and reverse (downward) at a variable speed. 7 is an electromagnetic brake that brakes the electric motor 6, and 8 is a power transformer. The primary side is connected between the R phase and T phase of the power supply line 5, and a low voltage ( For example, 24V) is supplied.

  The operation box 2 includes an emergency push button switch 21, an ascending push button switch (rising low / high speed two-stage push button switch) 22, and a descending push button switch (descending low / high speed two-stage push button switch) 23. The data is input to an interface (IF) circuit 31 of the control device 3. The emergency pushbutton switch 21 is always closed, and when the power is turned on, the secondary output of the transformer 8 is applied to the relay 34 through the emergency pushbutton switch 21, and the contact 34 a is closed by energization, so that the inverter 4 Terminals HI and HC are short-circuited. When an abnormality such as motor runaway occurs, when the emergency pushbutton switch 21 is pressed, the energization of the relay 34 is released, the contact is opened, and the terminals HI and HC of the inverter 4 are opened.

FIG. 3 is a diagram showing an operation pattern of the electric motor 6 according to an ascending / descending command from the operation box 2 of the operation control device 1. The inverter control unit of the inverter 4 performs the following low speed up operation, high speed up operation, low speed down operation in response to the low speed up operation command L _U , the high speed up operation command H _U , the low speed down operation command L _D , and the high speed down operation command H _D. Then, the electric motor 6 is operated in a pattern of high-speed descent operation.

[Low-speed climbing operation]
When the ascending pushbutton switch 22 is pushed down to the first stage at time ta, the interface circuit 31 recognizes this and outputs a low speed ascending operation command L _U to the inverter 4. In response to the low speed increasing operation command L _U , an inverter control unit (not shown) of the inverter 4 performs predetermined processing until the speed reaches the speed of the low speed increasing operation command L _U from the minimum rising speed F _{LU as} shown in A of FIG. Electric power having a frequency that becomes acceleration is supplied from the inverter 4 to the electric motor 6. As a result, the electric motor 6 is accelerated at a predetermined acceleration, and reaches the speed of the low speed ascending operation command L _U. After reaching the speed of the low-speed ascending operation command L _U , it rotates in the ascending direction at this speed. When the ascending pushbutton switch 22 is opened at time td, the interface circuit 31 recognizes this and the low-speed ascending operation being output to the inverter 4 Command L _U is stopped. Receiving the stop of the low-speed increasing operation command L _U, the inverter control unit of the inverter 4, the electric motor 6 is decelerated by supplying a power of a frequency to slow at a predetermined deceleration, the time te which is reduced to a minimum increase rate F _LU Thus, the power supply from the inverter 4 to the electric motor 6 is stopped and the electric motor 6 is stopped.

[High-speed climbing operation]
When the rise pushbutton switch 22 at time ta pushed to the second step, the interface circuit 31 recognizes it, and outputs the fast rising operation command H _U to the inverter 4. In response to the high speed ascending operation command H _U , the inverter control unit of the inverter 4 has a predetermined acceleration frequency from the minimum ascent speed F _LU to the speed of the high speed ascending operation command H _U as shown in FIG. Is supplied from the inverter 4 to the electric motor 6. Thus the electric motor 6 is accelerated at a predetermined acceleration, the speed of the high speed rising operation command H _U. After reaching the speed of the high speed ascending operation command H _U , it rotates in the ascending direction at this speed, and when the ascending pushbutton switch 22 is opened at time tc, the interface circuit 31 recognizes this and the high speed ascending operation being output to the inverter 4 Command H _U is stopped. In response to the stop of the high speed ascending operation command H _U , the inverter control unit of the inverter 4 supplies the motor 6 with power of a frequency that decelerates at a predetermined deceleration, decelerates, and decelerates to the minimum ascent speed F _LU. Thus, the power supply from the inverter 4 to the electric motor 6 is stopped and the electric motor 6 is stopped.

(Low speed descent operation)
Pushing the lowering push button switch 23 to the first stage at time ta, the interface circuit 31 recognizes it, and outputs the low-speed down operation command L _D to the inverter 4. In response to the low speed descent operation command L _D , an inverter control unit (not shown) of the inverter 4 performs a predetermined operation from the minimum descent speed _FLD to the low speed descent operation command L _D as shown in C of FIG. Electric power having a frequency that becomes acceleration is supplied from the inverter 4 to the electric motor 6. Thus the electric motor 6 is accelerated at a predetermined acceleration, the speed of the slow down operation command L _D. After reaching the speed of the low speed ascending operation command L _U, the motor rotates in the descending direction at this speed. When the descending push button switch 23 is opened at time td, the interface circuit 31 recognizes this and the low speed descending operation being output to the inverter 4 is performed. Command L _D is stopped. Receiving the stop of the low-speed down operation command L _D, the inverter control unit of the inverter 4, the electric motor 6 is decelerated by supplying a power of a frequency to slow at a predetermined deceleration, the time te which is decelerated to a minimum the lowering speed F _LD Thus, the power supply from the inverter 4 to the electric motor 6 is stopped and the electric motor 6 is stopped.

[High-speed descent operation]
Pushed at time ta the lowering push button switch 23 to the 2nd step, the interface circuit 31 recognizes it, and outputs the high-speed descent operation command H _D to the inverter 4. Inverter control unit of the inverter 4 receives the quick descent operation command H _D, as shown in D in FIG. 3 from the lowest lowering speed F _LD until the speed of fast descent operation command H _D, a predetermined acceleration frequency Is supplied from the inverter 4 to the electric motor 6. Thus the electric motor 6 is accelerated at a predetermined acceleration, the speed of the high speed descent operation command H _D. Once in the speed of fast descent operation command H _D is rotated in the downward direction at this speed, when opening the lowering push button switch 23 at time tc interface circuit 31 is a high speed decreasing operation in the output recognize it to the inverter 4 to stop the command H _D. Receiving the stop of the high-speed descent operation command H _D, the inverter control unit of the inverter 4, the electric motor 6 is decelerated by supplying a power of a frequency to slow at a predetermined deceleration, the time te which is decelerated to a minimum the lowering speed F _LD Thus, the power supply from the inverter 4 to the electric motor 6 is stopped and the electric motor 6 is stopped.

  In FIG. 2, 51 is an upper limit switch and 52 is a lower limit switch. The upper limit switch 51 and the lower limit switch 52 are always closed, the hook attached to one end of the load chain of the electric chain block (not shown) continues to rise, and when the lever of the upper limit switch 51 is pressed, the contact is opened. Conversely, when the hook continues to descend, the terminal stopper attached to the other end of the load chain continues to rise, and when the lever of the lower limit switch 52 is pressed, the contact is released. The inverter 4 recognizes this and stops the forward rotation (upward direction) or reverse rotation (downward direction) of the electric motor 6 (stops the supply of driving power to the electric motor 6).

  As described above, the relay 34 is energized when the power is turned on, and the contact 34a is closed. A diode stack 71 is inserted in series in the V phase of the inverter 4, and a direct current obtained by rectifying the current flowing in the V phase flows into the electromagnetic brake 7 and releases the brake. When operating the braking force of the electromagnetic brake 7, when the inverter 4 short-circuits its terminals MA and MC, the secondary output of the transformer 8 is applied to the relay 36 and energized, and when the contact 36a is closed, the diode stack 71 The DC current supplied to the electromagnetic brake 7 is cut off and the braking force is activated. In FIG. 2, reference numeral 41 denotes a resistor that energizes the electric power generated by the electric motor 6 and dissipates heat when the hoisting machine descends.

In the operation control apparatus 1, as shown in FIG. 1, during the high-speed descent operation by the high-speed descent operation command H _D (second-stage pushing operation) of the descent pushbutton switch, the low-speed descent operation speed command L _D (1 When the stage push-in operation is issued, the inverter 4 supplies the motor with power having a frequency that decelerates at a specified deceleration and starts deceleration. When the two-stage push rise for push button switches at a timing of time t2 produce fast rising operation command H _U, after the inverter 4 is obtained by decelerating the electric motor 6 to the low speed, the period of the output frequency at the time t3 to the electric motor (phase) Is reversed. At this time, the torque of the electric motor decreases in the inversion region of the inversion operation (the output frequency of the inverter 4 near 0 Hz). Therefore, the inverter 4 causes an overcurrent because the current is increased in order to cause the motor 6 to generate a large torque. If the capacity of the inverter 4 is not sufficient, the inverter 4 trips due to a self-protection function and the motor 6 stops.

Therefore, in this case, the inverter 4 is prevented from using a large-capacity inverter by suppressing the overcurrent to avoid a self-protection trip of the inverter. For this reason, when the motor 6 is decelerated to the minimum lowering speed _FLD , when switching to the ascending operation, the electromagnetic brake 7 is operated for a predetermined time to brake the electric motor 6, so The torque shortage of the electric motor 6 is compensated by the braking force of the brake. As a result, it is possible to suppress the inverter 4 from flowing an overcurrent in an attempt to increase the small torque when the electric motor 6 rotates at an extremely low speed. Therefore, tripping can be prevented without increasing the capacity of the inverter 4. That is, the inverter control unit of the inverter 4 short-circuits the terminals MA and MC when the lowering speed of the electric motor 6 reaches a predetermined low speed, and applies the secondary side output of the transformer 8 to the relay 36 to energize it. As a result, the contact 36a of the relay 36 is closed, the direct current supplied from the diode stack 71 to the electromagnetic brake 7 is cut off, and the braking force is activated.

FIG. 4 is a diagram showing timing for operating the electromagnetic brake 7. During fast descending operation by the high-speed decreasing operation speed ON command H _D by 2-stage operation of pushing down a push button switch 23 to open the second-stage pushing at time t1 to turn OFF the high-speed descent command H _D. As a result, the inverter control unit supplies power from the inverter 4 to the electric motor 6 at a frequency for decelerating the rotation speed at the specified deceleration, and starts decelerating the descending rotation speed. The first stage push the lowering push button switch 23 at time t2 is also opened to the OFF slow down operation command L _D. If there is an operation of pushing the ascending pushbutton switch 22 to the second stage at time t3 during deceleration of the descending rotational speed of the electric motor 6, both the ascending high speed and ascending low speed commands H _U and L _U are turned ON. Inverter control unit of the inverter 4 at the time t4 has reached a predetermined minimum lowering speed F _LD continued deceleration of the lowering speed of the motor 6 in this state, the terminal MA, the MC shorted to bias the relay 36. As a result, the contact 36a is closed for a time T (for example, 80 msec to 200 msec), the direct current supplied from the diode stack 71 to the electromagnetic brake 7 is stopped, and the braking force is activated.

At time t5 after the elapse of time T, the inverter control unit switches to the high-speed increase operation command H _U , supplies power to the motor 6 with a frequency that accelerates the rotation speed at a predetermined acceleration, and sets the rotation speed of the motor 6 to the high-speed increase operation command H Drive to _U speed. As a result, the electromagnetic brake 7 normally provided in the hoisting machine is used to apply a braking force when the torque at the time of extremely low speed rotation of the electric motor 6 is small, so that the torque shortage of the electric motor 6 is compensated. without adding any component to the manufacturing machine, high-speed decreasing operation command H _D fast increasing operation commanding during deceleration during OFF H _U is even with reversing operation command oN, the inversion time of the rising operation from the lowered operating The overcurrent supplied from the inverter 4 to the electric motor 6 can be suppressed. This can be achieved only by changing the software of the computer incorporated in the inverter control unit, so that it is not necessary to add hardware electronic components and can be achieved at a low cost.

In the above embodiment, as shown in FIG. 1, to release the high-speed descent operation command H _D at time t1 during high-speed decreasing operation by the high-speed descent operation command H _D of the lowering push button switch 23, at a defined deceleration an inverter trip due to overcurrent caused by obtained by inverting the electric motor at time t3 reaches a minimum lowering speed F _LD when fast rise operation command H _U by increasing pushbutton switch 22 at time t2 during deceleration is issued was described as an example, fast descent operation command H _D is released increasing operation command during deceleration (H _U, L _U) is generated by inverting operation of the electric motor 6 at the time it reaches the low speed, the inverter 4 if the flow of overcurrent as to trip, even reversing operation of the motor 6 is not fast rise operation command H _U, the present invention is applicable. That is, there is increasing operation command in the released fast descent operation command H _D reduction, in an attempt to increase the torque during low-speed reversal can utilize the present invention to suppress an excessive current supplied from the inverter. For example, the present invention can also be applied to the case where the ascending push button switch and the descending push button switch can specify the speed magnitude steplessly according to the pushing amount.

Further, in the embodiment of FIG. 4, the minimum descent speed _FLD arrival time t4 is set as the start time of the brake command and the reverse operation time t5 is set as the stop time of the brake command. The output frequency from the inverter 4 is shown in FIG. As in the case, the brake operation command may be turned ON a predetermined time T before the arrival time of the lowest lowering speed _FLD (output start time of the lowest rising speed _FLU ) as shown in FIG.

Further, as shown in FIG. 6, the power frequency of the lowest descending speed _FLD is continued for a fixed time from the time t1 to the time t2 when the output frequency of the inverter 4 reaches the lowest descending speed _FLD. After the supply, when the frequency becomes 0 Hz at time t2 and continues until time t3, and the reverse operation is performed at time t3, the brake operation command is issued at time t1 when the minimum descending speed _FLD is reached, The T-brake may be operated for a predetermined time from t1 to the output start time t3 of the minimum ascent speed _FLU .

Further, as shown in FIG. 7, the frequency of the lowest lowering speed F _LD from the time t2 the output frequency of the inverter 4 reaches the minimum lowering speed F _LD to the lowest rising speed F _LU output start time (inversion time) t3 power When the inverter 4 supplies the electric motor 6 to the electric motor 6, the brake operation command may be issued at a time t1 before the time t2, and the brake may be operated for a predetermined time between the time t1 and the time t3. .

  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. In addition, any configuration 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 exhibited.

It is a figure which shows the timing chart for demonstrating the inverter trip of the conventional winding machine. It is a block diagram which shows the structural example of the operation control apparatus of the winding machine which concerns on this invention. It is a figure which shows the driving | running state of the electric motor by the raising / lowering operation command of the operation control apparatus of the winding machine which concerns on this invention. It is a figure which shows the timing which act | operates the electromagnetic brake of the operation control apparatus of the winding machine which concerns on this invention. It is a figure which shows the timing which act | operates the electromagnetic brake of the operation control apparatus of the winding machine which concerns on this invention. It is a figure which shows the timing which act | operates the electromagnetic brake of the operation control apparatus of the winding machine which concerns on this invention. It is a figure which shows the timing which act | operates the electromagnetic brake of the operation control apparatus of the winding machine which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation control apparatus 2 Operation box 3 Control apparatus 4 Inverter 5 Power supply line 6 Electric motor 7 Electromagnetic brake 8 Transformer 21 Emergency pushbutton switch 22 Lifting pushbutton switch 23 Decreasing pushbutton switch 31 Interface circuit 34 Relay 36 Relay 41 Resistor 51 Upper limit switch 52 Lower limit switch 71 Diode stack

Claims (5)

An electric motor for hoisting and lowering, an inverter for supplying driving electric power to the electric motor, and an inverter control unit for controlling the inverter, and controlling the inverter by the control unit according to an operation command of the operating unit to raise and lower the electric motor An operation control device for a hoisting machine that performs operation,
The inverter control unit accelerates to a predetermined high speed with a predetermined acceleration by turning on a high speed descent operation command from the operation unit, decelerates to a minimum descent speed with a predetermined deceleration by turning off the high speed descent operation command, and increases at high speed. Acceleration / deceleration means for accelerating to a predetermined high speed with a predetermined acceleration by turning on the operation command, and supplying power from the inverter to the electric motor at a frequency that decelerates to a minimum ascent speed with a predetermined deceleration by turning off the high speed operation command;
If the ascending operation command is ON during deceleration to the minimum descending speed due to the high-speed descending operation command being turned off during the operation of the high-speed descending operation command, the vehicle is decelerated to the prescribed low speed at the predetermined deceleration and then ascended from the descending operation The operation control of the hoisting machine comprising: brake operating means for operating the brake from the time decelerated to the predetermined low speed to the reversal time to apply braking to the electric motor when reversing and switching to driving apparatus. In the operation control apparatus of the hoist according to claim 1,
The predetermined low speed is the minimum lowering speed, the inverter control unit performs the reversal at a time when a predetermined time has elapsed from the time when the speed is reduced to the minimum lowering speed, and the brake operating means operates the brake for the predetermined time. An operation control device for a hoisting machine. In the operation control apparatus of the hoist according to claim 1,
The predetermined low speed is a predetermined speed before reaching the minimum lowering speed, the inverter control unit performs the reversal at a time when the minimum lowering speed is reached, and the brake operating means starts from the time when the predetermined low speed is reached. An operation control device for a hoisting machine that operates a brake until a reversal time. In the operation control device of the hoist according to any one of claims 1 to 3,
The operation unit includes an ascending push button switch for issuing a high speed ascending operation command and a low speed ascending operation command, and a descending push button switch for issuing a high speed descending operation command and a low speed descending operation command. . An electric motor for hoisting and lowering, an inverter for supplying driving electric power to the electric motor, and an inverter control unit for controlling the inverter, and controlling the inverter by the control unit according to an operation command of the operating unit to raise and lower the electric motor An operation control method for a hoist that performs operation,
When the high-speed descent operation command is turned on, the acceleration is accelerated to a predetermined high speed with a predetermined acceleration. When the high-speed descent operation command is turned off, the acceleration is decelerated to the minimum descent speed. Accelerating to a predetermined high speed, and supplying the electric power from the inverter to the electric motor at a frequency that decelerates to a predetermined minimum ascent speed at a predetermined deceleration by turning off the high speed ascent operation command.
During the operation of the high-speed descending operation command, if the ascending operation command is ON while decelerating to the minimum descending speed at the deceleration by turning off the high-speed descending operation command, the operation is decelerated to the predetermined low speed at the predetermined deceleration. A method for controlling the operation of the hoisting machine, wherein, when switching from the descending operation to the ascending operation and reversing, the brake is activated to brake the electric motor from the time when the speed is reduced to the predetermined low speed until the reversing time.

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