JP3277053B2 - Cable winding device for power supply of bucket opening and closing motor in hydraulic crane with bucket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control of a crane with a hydraulic bucket, and more particularly to a hydraulic pump motor power supply cable for opening and closing a bucket in conjunction with a hydraulic bucket hoist motor. The present invention relates to a cable winding device for supplying power to a bucket opening / closing motor in a crane with a hydraulic bucket.

[0002]

2. Description of the Related Art An apparatus for winding a power supply cable to a bucket opening / closing hydraulic pump motor in a conventional hydraulic bucket crane will be described with reference to the drawings. 4 is a front view illustrating a hoisting device of a crane with a hydraulic bucket, FIG. 5 is a circuit diagram of a power feeding cable winding device, and FIG. 6 is a speed / current characteristic diagram of a torque motor .

[0003] As shown in FIG. 4, a crane with a hydraulic bucket (hereinafter simply referred to as a crane) 10 includes a club 11.
And a hydraulic bucket body (hereinafter simply referred to as a bucket) 1
2 and a cable lead 16 that rewinds and rewinds a power supply cable 15 of a bucket opening / closing hydraulic motor 14 provided in the bucket 12.

[0004] A torque motor 17 is used as a motor which is a driving source of the cable lead 16. And
As shown in FIG. 5, the torque motor by applying a continuous constant voltage
The power supply cable 15 is configured to always generate a torque in an upward direction so that the power supply cable 15 is always kept in a slack-free state. Figure 18 is a brake, 19 torque mode
A cooling fan of the heater 17 and a thermal relay 20 are provided.
The bucket 12 is provided with a hoisting motor 21 constituting the hoisting device 13.
Is controlled by a controller 22 operated by a driver via a winding up / down control device 23 (see FIG. 1).

[0005]

[SUMMARY OF THE INVENTION] However, at the cable reel 16 of the power supply cable, even at the time of the bucket is stopped as shown in FIG. 6, the torque motor 1
Since the entire voltage is applied to 7, the current at the time of restraint, that is, 4 to 5 times the normal rated current flows. Also, the torque motor 1
Since 7 is stopped, no cooling effect is obtained by the cooling fan 19.

For this reason, the torque motor 17 has a large structure to withstand heat sufficiently, and further has a cooling fan 19.
Is provided. Therefore, the conventional winding device 13 has disadvantages such as an increase in the space of the cable winding device 13 occupying the club 11 and an increase in equipment such as the torque motor 17.

The present invention has been made in view of the above points, and has as its object to provide a compact and economical cable winding device for supplying power to a hydraulic pump motor .

[0008]

Means for Solving the Problems The present invention is a hydraulic pump motor bucket opening in the overhead crane with hydraulic bucket
A power supply cable winding device for data, and a general-purpose squirrel-cage motor with a brake winding the cable, the cage mode
Motor and the inverter placed between the power supply, in conjunction with the operation command is output at the winding up and down controller operated by the driver, the starting of the squirrel-cage motor through an inverter, and sometimes the operation command on the stop and take more increased by a predetermined value Hayashi, a cable winding control unit when under winding to control deceleration by a predetermined value than the operation command, the bucket during the opening and closing operation stops the motor for a bucket hoisting, the cage via the inverter Type motor ,
And a low output control unit that continuously generates a low torque in the hoisting direction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cable winding device for feeding a bucket hoist motor in a crane with a hydraulic bucket according to the present invention (hereinafter referred to as the winding device of the present invention) will be described below with reference to the drawings.

FIG. 1 is a block diagram of the winding device of the present invention, FIG. 2 is a flowchart for explaining the operation of the winding device of the present invention, and FIG. 3 is a speed / current characteristic diagram of a cable winding motor . The same parts as those of the conventional parts will be described with the same reference numerals.

The winding device 30 of the present invention includes a general-purpose cage-type motor with brake (hereinafter, referred to as a cage-type motor ) 31, a cable winding control unit 32, an inverter 33, and a low output control unit 34. . The cage motor 31 replaces the conventional torque motor 17 and is not generally used widely.

The cable winding control unit 32 sends predetermined signals to the winding control unit 23 and the inverter 33 low output control unit 34 based on an operation command issued from a winding control unit 22 operated by a driver (not shown). It outputs a command.

The inverter 33 comprises a power source S and the cage motor 3
1 and a cable winding control unit 32
And the cage-type motor 3 based on the output of the
1 is controlled. Note that the low output control unit 34
Includes a microcomputer (not shown) together with the cable winding control unit 32.

Next, the operation of the control method of the present invention will be described with reference to FIG. N1, N2,... In the figure indicate the numbers of the processing procedures (steps). First, the operation of the upper side of the bucket will be described. (1) When the driver operates the winding up / down controller 22 to a predetermined position, an operation command including a winding up / down speed command S1 and a start / stop command S2 from the winding up / down controller 22 is issued (N
1).

(2) The operation commands S1 and S2 are input to the cable winding control unit 32, and the speed command S1 and the start operation command S2 are input (N2).
3), the bucket hoisting motor 21 is started (N4). (3) When the stop command S2 is issued according to the above (N
5) Via the cable winding up / down control device 23 (N6), the bucket winding motor 21 stops (N7).

Next, the operation on the cable rail side will be described. (4) In the above (2), the cable winding control unit 32
Determines whether the hoisting vertical speed command S1 is hoisting or hoisting (N
8). (5) If the result of the determination is that the hoisting vertical speed command S1 is the hoisting direction, a predetermined value is added to the hoisting speed command (S1 + α) (where α is a positive number) (N9) and output to the inverter 33 .

(6) The inverter 33 performs the hoisting speed command value (S1 +
Based on α), the car-shaped motor 31 is operated so as to be faster than the bucket hoisting motor 21 by a predetermined speed (N10), and the car-shaped motor 31 is operated at an increased speed (N1).
1). Thereby, the winding delay of the power supply cable 15 is eliminated, and the slack of the power supply cable 15 is eliminated. (7) In (5), if the operation command S1 is on the lower side, the command speed is set to (S1-α) in the opposite manner (N9 ′).

(8) As described in (3) above, when the stop operation command S2 is issued (N5), the winding up / down controller 23 stops (N6), and the bucket hoisting motor 21 stops (N7). ). However, the cage motor 31 on the cable reel side
Do not stop and operate at low torque. That is, the inverter 33 is controlled by the command signal S3 so as to reduce the output frequency of the inverter or the inverter output voltage via the low output control unit 34. Thereby, the inverter 3
3 switches the output (N12), and the cage motor 31 is operated with the low torque output or the low frequency output (N1).
3).

In the above case, the speed and current of the squirrel-cage motor 31 are extremely smaller than the normal current value as compared with the curve A in the normal operation as shown by the curve B in FIG.
Further, the current value is extremely small as compared with the current value of the torque motor shown in FIG. 6, and the thermal condition is also very good.

[0020]

As described above, the winding device of the present invention is a cable winding device for feeding a hydraulic pump motor for opening and closing a bucket in an overhead crane with a hydraulic bucket, and a general-purpose car with a brake for winding the cable. and shape motor <br/>, an inverter disposed between the cage motor and power source, the winding operated by the driver, in conjunction with the operation command is output at the lower controller, said car via the inverter A cable winding control unit for increasing the speed by a predetermined value from the operation command when starting, stopping and hoisting the shaped motor , and controlling the speed to be decelerated by a predetermined value from the operation command when unwinding; When the motor is stopped and the bucket is opening and closing, the cage type motor is provided with a low output control unit that continuously generates a low torque in the hoisting direction via the inverter. I have. Therefore, there is an advantage that the cable winding device can be reduced in size and is economical because an expensive torque motor and a cooling fan are not used.

[Brief description of the drawings]

FIG. 1 is a block diagram of a hydraulic bucket hoisting device according to the present invention.

FIG. 2 is a flowchart illustrating a control method of the present invention.

FIG. 3 is a speed / current characteristic diagram of a squirrel-cage motor according to the control method of the present invention.

FIG. 4 is a drawing related to the prior art, and is a front view illustrating a power feeding cable winding device.

FIG. 5 is a circuit diagram of a power feeding cable winding device according to the related art.

FIG. 6 is a speed-current characteristic diagram of a torque motor .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 Bucket hoisting motor 22 Winding up / down controller 23 Winding up / down control device 30 Cable winding device 31 General-purpose cage type motor with brake 32 Cable winding control unit 33 Inverter 34 Low output control unit

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66D 1/40 B66C 13/32

Claims (1)

(57) [Claims] 1. A power supply cable winding device of hydraulic hydraulic pump motor bucket opening in overhead crane with buckets, and a general-purpose squirrel-cage motor with a brake winding the cable, the said cage motor and power source Interlocked with an inverter placed between the inverter and a driving command output from a hoisting / lowering controller operated by a driver, the starting value of the squirrel-cage motor is increased by a predetermined value from the driving command when starting, stopping and hoisting the squirrel-cage motor via the inverter. A cable winding control unit that speeds up and lowers by a predetermined value from the operation command when winding down, and a bucket winding control unit
A hydraulic bucket comprising: a low output control unit that continuously generates a low torque in a hoisting direction in the cage type motor via an inverter while the motor is stopped and the bucket is opening and closing. Opening and closing of buckets with crane
Cable winding device for motor power supply.