JPH04256692A - Crane driving device - Google Patents

Abstract

PURPOSE:To make the drive smoothly and safely, construct compactly, and enhance the controlling performance by coupling an induction machine of a retarder control device with a drum of a winch, and connecting the battery side with a lift magnet through a converter emitting the output upon conversion into the specified voltage. CONSTITUTION:When a lift magnet switch 40 is put on, a specified voltage is impressed on a lift magnet 14 from a battery 33 of a retarder control device 30 through a converter 38 to cause magnetization of the lift magnet, and with the electromagnetic force thus produced, a heavy object of iron is attracted to the lift magnet 14. When a winch switch 41 is put on, an operation mode setting circuit 39 generates setting of the motor driven mode, and a rotating magnetic field advancing circuit 36 gives a frequency signal with a certain advance to an inverter circuit 32. Now a rotating magnetic field advancing relative to the rotor part 31a of an induction machine 31 is generated in the stator part 31b of the induction machine 31, and a high voltage is impressed from the battery 33 with a discharge circuit 35. Accordingly the induction machine 31 works as a motor, and with the power thus produced, the drum of a winch 10 is rotated to take up a wire rope.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for electrically integrating and controlling a hoisting device and a lift magnet in a crane equipped with a lift magnet for electrically attracting heavy iron objects.

0002

[Prior Art] Various types of wheel cranes that can perform crane operations and travel have been proposed, one of which is a crane truck that lifts heavy iron objects by electrostatic attraction using a lift magnet. There is. This crane vehicle with a lift magnet has a hoisting device that uses the power of a traveling engine, and also has a generator unit to obtain power for the lift magnet. The generator unit generates electricity in a state where it can always attract heavy iron objects when the engine is operated under load, and this generator unit supplies power to the lift magnet to attract the heavy objects. Further, the heavy object attracted by the lift magnet is hoisted up by operating a hoisting device using engine power, transported to a predetermined place by the loading platform of the vehicle or by the vehicle running, and gradually lowered by the braking means. .

0003

[Problems to be Solved by the Invention] However, in the above-mentioned conventional crane drive device, the hoisting device is hoisted by engine power and hoisted down by brake means, so hunting etc. can be prevented and the hoisting device can be hoisted smoothly. Difficult to operate. Furthermore, since the generator unit must be constantly driven by engine power, there are problems in that fuel consumption and noise are large.

The present invention was made in view of these problems, and its purpose is to improve operability, power generation, etc. by electrically driving a hoisting device and a lift magnet.
Another object of the present invention is to provide a crane drive device that can regenerate energy during lowering.

[0005]

[Means for Solving the Problems] In order to achieve this object, the present invention connects an induction machine operating as a motor and a generator of a retarder control device to a drive system of a hoisting device having a lift magnet in a crane, The main feature is that the battery side of the retarder control device is connected to the lift magnet via a converter. Then, the lift magnet of the hoisting device is electromagnetized to be supplied with a battery power supply to electromagnetize the heavy iron object, and is electrically driven by an induction machine to hoist it up and electrically brake it to lower it. This will generate electricity to charge the battery and improve the operability of cranes equipped with lift magnets.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a crane vehicle with a lift magnet as a crane to which the present invention is applied, and its drive device. provided. A boom 7 elevating device 8 is mounted on the loading platform 5 of the vehicle body 3 via a swivel device 6, and a boom extending/retracting device 9,
A hoisting device 10 for heavy iron objects W is provided. The hoisting device 10 has a structure in which a wire rope 12 from a rotating drum 11 passes through the inside of the telescoping device 9, is guided by a roller 13 at the tip, and is taken out to the outside, and a lift magnet 14 is attached to the end of the wire rope 12. be done. Also, engine 1
5 is connected to a hydraulic pump 17 via a torque converter 16, the pump is driven by the power of the engine, and the vehicle travels by the hydraulic pressure of this pump.
, to drive the expansion and contraction device 9.

On the other hand, an electric driving means is added to the lift magnet 14 which is electrically attracted to the hoisting device 10. This electric drive device is an induction machine 31 that operates as a generator and a motor in a retarder control device 30 already proposed by the applicant. and,
The rotating shaft 18 of the induction machine 31 is connected to the drum 11 of the hoisting device 10, and the induction machine 31 is powered by a battery.
is operated as an electric motor to hoist the heavy iron object W, and the induction machine 31 is operated as a generator to lower the iron heavy object W while electrically braking and charge the battery. In addition, the battery side of the retarder control device 30 is connected to the lift magnet 1.
4, and can be magnetized when attracted.

FIG. 2 is a detailed configuration diagram of the crane vehicle drive system, in which the hydraulic pump 17 is provided with a hydraulic control device 20 for traveling and crane work using hydraulic pressure, and the induction machine 31 is equipped with a retarder for controlling it. A control device 30 is provided. The hydraulic pump 17 of the hydraulic control device 20 is connected to an oil pan 21
The hydraulic pressure of this pump is pumped up to generate high oil pressure according to the rotation speed, and the oil pressure of this pump is transmitted through an oil passage 22 to a travel valve 23, a swing valve 26, which are operated by various lever operations.
It is guided to an elevation valve 25 and a telescopic valve 24. Hydraulic motors 27 and 28 are attached to the wheels 2 and the swing device 6, respectively, and the hydraulic motors 27 and 28 are connected to each other through oil passages 22a and 22d by the operation of the travel valve 23 and the swing valve 26, respectively.
Supply hydraulic pressure to 28. Further, by operating the telescopic valve 24 and the elevation valve 25, hydraulic pressure is supplied to the telescopic device 9 and the elevation device 8 via oil passages 22b and 22c.

In the retarder control device 30, the induction machine 3
1, a rotor portion 31a consisting of a rotor-side core and a coil is provided on the rotating shaft 18, and a stator portion 31b consisting of a stator-side core and a coil is provided on the housing 31'. The rotor part 31a and the stator part 31b are arranged close to each other in the radial direction, and the rotor part 3
It is configured to operate as an electric motor by advancing the rotating magnetic field of the stator portion 31b with respect to 1a, and to operate as a generator by delaying it.

The induction machine 31 is connected to a battery 33 via an inverter circuit 32, and a charging circuit 34 and a discharging circuit 35 are connected to the circuit of the battery 33. Further, a converter 38 is connected to the battery 33 and converts the voltage into a predetermined voltage capable of attracting a heavy iron object W and outputs the voltage, and the converter 38 is connected to the lift magnet 14 . On the other hand, it has a riff mag switch 40, a winding switch 41, and a lowering switch 42.
A zero signal activates converter 38. These switch signals are input to the operation mode setting circuit 39, and when hoisting, the electric mode is set and this mode signal is input to the discharge circuit 35 and the rotating magnetic field advancement circuit 36, and when lowering, the power generation mode is set. This mode signal is input to the charging circuit 34 and the rotating magnetic field delay circuit 37. The rotating magnetic field advancing circuit 36 generates a frequency signal of a rotating magnetic field that is advanced by a predetermined amount with respect to the rotation signal from the rotation sensor 43 that detects the rotation speed of the rotor portion 31a of the induction machine 31, and outputs it to the inverter circuit 32. The rotating magnetic field delay circuit 37 is configured to generate a frequency signal of a rotating magnetic field delayed by a predetermined amount with respect to the rotation signal from the rotation sensor 43, and output it to the inverter circuit 32.

Next, the operation of this embodiment will be explained. First, when the engine 15 of the crane truck 1 is operated, the power of the engine 15 increases the torque ratio in the torque converter 16 and is transmitted to the hydraulic pump 17, thereby generating hydraulic pressure corresponding to the power of the engine. Therefore, when the vehicle is stopped, the operator operates the lever to control the hydraulic control device 20.
When the elevating valve 25 and the telescopic valve 24 are operated, the elevating device 8 and the telescopic device 9 are supplied with oil, and the boom 7 is elevated to a predetermined height and telescopically extends and retracts. Furthermore, when the hydraulic motor of the swing device 6 is refueled by the swing valve 26, the boom 7 swings out of the vehicle body 3, and in this state, the lift magnet 14 is placed on top of the heavy iron object W, allowing crane work to be carried out. It becomes possible to do so.

When the lift magnet switch 40 is operated, the converter 38 applies a predetermined voltage from the battery 33 of the retarder control device 30 to the lift magnet 14 to magnetize it, and this electromagnetic force causes the lift magnet 14 to be magnetized.
A heavy iron object W is electrostatically adsorbed. Thereafter, when the winding switch 41 is operated, the operation mode setting circuit 39 sets the electric mode, and a frequency signal with a predetermined advance is input from the rotating magnetic field advance circuit 36 to the inverter circuit 32, and the stator section 31b of the induction machine 31 is A rotating magnetic field is generated in the rotor portion 31a, and a high voltage is applied from the battery 33 by the discharge circuit 35. For this reason, the induction machine 31 operates as an electric motor and rotates, and the drum 11 of the hoisting device 10 rotates due to the induction machine power, and the wire rope 1
2, and along with this, lift magnet 1
The heavy iron object W that is electrostatically attracted to 4 rises smoothly. In this way, the hydraulic control device 2
0, the vehicle is transported to a predetermined location by running the vehicle, etc., and the lowering switch 42 is operated. Then, in response to the power generation mode signal, a frequency signal with a predetermined delay is input from the rotating magnetic field delay circuit 37 to the inverter circuit 32, so that a rotating magnetic field delayed with respect to the rotor section 31a is generated in the stator section 31b of the induction machine 31. become. Therefore, the induction machine 31 operates as a generator, and electrical braking is applied to the drum 11 of the hoisting device 10 on which a large load of heavy objects is acting, and due to this braking force and the weight of the heavy iron object W, the wire rope is rewound and the heavy iron object W gradually descends. When the lift magnet 14 reaches a predetermined position, the lift magnet 14 is demagnetized by the lift magnet switch 40.
is placed in a free state, completing one cycle of crane work.

[0013] Further, the induction machine 31 generates electricity due to the electric braking during lowering, and this electrical energy is converted into direct current by the inverter circuit 32, and is regenerated by charging the battery 33 by adjusting the voltage of the charging circuit 34. It turns out. thus,
When lowering a heavy iron object W with a crane, the mechanical energy is used to charge a battery by the retarder control device 30 having an induction machine 31, and this battery power supplies power to the lift magnet 14, which is then electrically driven during hoisting. What happens is repeated and repeated.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto.

[0015]

As explained above, the present invention provides a crane drive device equipped with a lift magnet, in which a hoisting device is provided with an induction machine of a retarder control device that operates as an electric motor and a generator. Since the winding and lowering operations are electrically controlled, these drives can be performed smoothly and safely. Since the mechanical energy generated by heavy iron objects during lowering is converted into electrical energy and regenerated, a generator unit is no longer required, engine power is also reduced, and fuel efficiency is improved. Since the lift magnet and hoisting device are electrically controlled in one piece, it is compact and has improved controllability.

[Brief explanation of the drawing]

1 is a side view of an embodiment of a crane drive according to the invention; FIG.

FIG. 2 is a configuration diagram showing the same details.

[Explanation of symbols]

1 Crane truck with lift magnet 8 Elevation device 9　Expansion device 10 Winding device 11 Drum 12 Wire rope 14 Lift magnet 20 Hydraulic control device 30 Retarder control device 30 31 Induction machine 31 33 Battery 38 Converter

Claims (2)

[Claims] Claim 1: A hoisting device having a lift magnet at the end of a wire rope from a drum, comprising: a hydraulic elevating device;
In a crane drive device that is suspended and supported by a telescoping device, an induction machine that operates as a motor and a generator of a retarder control device is connected to the drum of the hoisting device, and the battery side of the retarder control device is connected to a predetermined position. A crane drive device that is electrically connected to a lift magnet via a converter that converts the voltage into a voltage and outputs the voltage. 2. The retarder control device electrically adsorbs a heavy iron object by magnetizing the lift magnet by supplying power from the battery to the lift magnet using a switch signal, and applies battery voltage to the induction machine when hoisting the hoisting device. and is configured to generate a rotating magnetic field that advances the induction machine to drive it, generate a delayed rotating magnetic field in the induction machine during lowering to perform electrical braking, and charge the battery with the generated electrical energy. A crane drive device according to claim 1.