KR101248129B1 - Electrical energy regeneration apparatus for a tower crane - Google Patents

Abstract

The present invention relates to an electric energy regeneration device of a tower crane, and to prevent the waste of energy by converting the electric energy generated by the drive motor during the lowering or swinging operation of the tower crane to supply and use as a power source. will be.

Description

Electrical energy regeneration apparatus for a tower crane

TECHNICAL FIELD The present invention relates to a tower crane driving technology, and more particularly, to an electric energy regeneration device of a tower crane.

At the time of recommendation or deceleration of the tower crane, the braking control of the drive motor must be performed against gravity and inertia, respectively, and electric energy is generated by the reverse drive of the drive motor. Failure to effectively remove the electrical energy from reverse driving of the drive motor when the tower crane is recommended or when the swing operation is decelerated causes serious problems in the drive motor and the motor-related control circuits.

Normally, the electric energy generated by the reverse drive of the drive motor during the recommendation or deceleration of the turning crane of the tower crane is converted into thermal energy through a resistor and discarded into the air, resulting in energy waste and at the same time acting as a factor of raising the atmospheric temperature. This helps to destroy the environment. In particular, in the case of construction equipment having a high lift height, such as a tower crane can be said to be severe waste of energy and thereby environmental damage in principle.

Therefore, the present inventors have studied the technology that can regenerate and use the electric energy generated by the reverse drive of the drive motor at the time of the winding or deceleration of the swing operation of the tower crane.

The present invention has been invented under the above-mentioned purpose, and the electric energy regeneration device of the tower crane which can prevent the waste of energy by regenerating the electric energy generated by the reverse drive of the drive motor at the time of the recommendation of the tower crane or the deceleration of the turning operation as a power source To provide for that purpose.

Another object of the present invention is to regenerate the electric energy as heat through the resistor in order to prevent damage to the control circuit related to the drive motor and motor by the electric energy, when the electric energy can not be regenerated by the power source, It is to provide electric energy regeneration device of tower crane that can cope actively with various power source (generator, transformer) change according to frequent installation of tower cranes by selectively using two methods of braking and braking through resistors.

According to an aspect of the present invention for achieving the above object, the electrical energy regeneration device of the tower crane converts the electrical energy generated by the drive motor during the unwinding or swing operation deceleration of the tower crane to supply to the power source to regenerate It features.

According to an additional aspect of the present invention, when the electric energy regeneration device of the tower crane cannot regenerate the electric energy as a power source, the electric energy through the resistor to prevent damage to the drive motor and the motor-related control circuit by the electric energy. It is characterized by consuming as heat.

The present invention has a useful effect of preventing the waste of energy by regenerating the electric energy generated by the reverse drive of the drive motor at the time of unwinding or swinging of the tower crane as a power source.

In addition, the present invention, if it is not possible to regenerate the electrical energy as a power source, in order to prevent damage to the control circuits related to the drive motor and motor by the electrical energy by dissipating the electrical energy as heat through a resistor to the regenerative braking and By selectively using two methods of braking through resistors, it has a useful effect to actively cope with various power sources (generators, transformers) changes caused by frequent movement of tower cranes.

1 is a block diagram according to an embodiment of an electric energy regeneration device of a tower crane according to the present invention.
2 is a circuit diagram according to an embodiment of the electric energy regeneration device of the tower crane according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the embodiments of the present invention may unnecessarily obscure the gist of the present invention.

The terms used throughout the present specification are terms defined in consideration of functions in the embodiments of the present invention, and may be sufficiently modified according to the intention, custom, etc. of the user or operator, and the definitions of these terms are used throughout the specification. It should be made based on the contents.

The tower crane has a hoist winch with a high lift height and is installed and used in various sites (construction, plant, shipyard) .It is a high-altitude equipment used for lifting and assembling heavy objects by moving it at any time after dismantling. .

The present invention is to prevent the waste of energy by regenerating the electric energy generated during the lifting operation of the tower crane or when the swing operation deceleration as a power source, when the electric energy can not be regenerated by the power source, the drive motor by the electric energy and In order to prevent damage to the control circuit related to the motor, the regenerative energy is consumed as heat through the resistor to selectively use two methods of regenerative braking and braking through the resistor according to the site conditions. Proactively cope with changes in power sources (generators, transformers).

1 is a block diagram according to an embodiment of an electric energy regeneration device of a tower crane according to the present invention. As shown in FIG. 1, the electric energy regeneration device 100 of the tower crane according to this embodiment is installed between the drive motor 200 and the power source 300.

The drive motor 200 operates as an electric motor at the time of hoist operation hoisting or turning operation increase of the tower crane, and operates as a generator at the time of hoisting or turning operation deceleration.

At the recommendation of the tower crane, the wire is released from the hoist winch of the tower crane by gravity, and at the time of turning deceleration, it continues to run in the direction of travel by the inertia of the upper swing body of the tower crane.

In this process, the driving motor 200 is driven backward to operate as a generator to generate electrical energy, and braking of the driving motor 200 against gravity or inertia for speed control for deceleration during the lowering or turning of the tower crane. Braking control is performed.

As shown in FIG. 1, the electric energy regeneration device 100 of the tower crane according to this embodiment includes a first conversion unit 110 and a second conversion unit 120.

The first converting unit 110 converts the electrical energy generated by the drive motor 200 when the tower crane is unwinding or turning operation deceleration. That is, when the tower crane is unwinding or turning operation decelerating, the driving motor 200 is driven backward to operate as a generator to generate alternating current, and is converted into direct current by the first conversion unit 110.

The second conversion unit 120 supplies and regenerates the electric energy converted by the first conversion unit 110 to the power source 300. That is, when the tower crane is recommended or when the swing operation is decelerated, the driving motor 200 is driven backward to operate as a generator to generate alternating current, and is converted into direct current by the first conversion unit 110, and the converted direct current is second. The converter 120 is easily transformed and is converted into alternating current having excellent remote power transmission capability and is supplied to the power source 300 to be regenerated.

For example, the second conversion unit 120 may be implemented to regenerate by supplying electrical energy to the power receiving end of the tower crane (not shown). The power source 300 at this time becomes the power receiving end of the tower crane.

In this case, the second conversion unit 120 may be implemented to convert the electrical energy converted by the first conversion unit 110 to electrical energy of the same characteristics as the power supplied to the power receiving end of the tower crane to regenerate. have.

For example, the second conversion unit 120 may be implemented to supply and regenerate electrical energy to an energy collection device (not shown) such as a battery. In this case, the electrical energy converted into alternating current by the second conversion unit 120 must be converted into direct current and stored, and the power source 300 becomes an energy collection device.

For example, the second conversion unit 120 may be implemented to regenerate by supplying electrical energy to a substation (not shown). The power source 300 at this time becomes a substation.

Therefore, the electrical energy regeneration device 100 of the tower crane according to this embodiment converts the electrical energy generated by the drive motor 200 to the direct current when the first conversion unit 110 is recommended when the tower crane or deceleration of the swing operation. In addition, the second converter 120 converts the AC into an alternating current having an excellent power transmission capability and is easy to transform, and supplies it to the power source 300 so as to reverse drive the driving motor 200 when the tower crane is turned down or when the turning operation is decelerated. It is possible to regenerate the electrical energy generated by.

On the other hand, according to an additional aspect of the invention, the electrical energy regeneration device 100 of the tower crane may further include a braking control unit 130 and a resistor 140.

The braking control unit 130 performs braking control of the driving motor against gravity or inertia at the time of recommendation or turning operation deceleration of the tower crane.

The resistor 140 consumes electrical energy generated by the braking control of the driving motor 200 by the braking control unit 130 as heat. Therefore, in this embodiment, when the electric energy generated by the reverse drive of the driving motor 200 when the winding or deceleration of the tower crane cannot be regenerated by the power source 300, this is generated as heat through the resistor 140. By consuming, damage to the drive motor 200 and the motor-related control circuit can be prevented.

Meanwhile, according to an additional aspect of the present invention, the electric energy regeneration device 100 of the tower crane may further include a selection switch 150 and a switching controller 160.

The selection switch 150 selects an energy regeneration scheme. In this case, the energy regeneration method may be selected by the selection switch 150 according to an operation by a user, or the energy regeneration method may be selected by the selection switch 150 automatically without a user operation.

The switching control unit 160 performs switching control of the first conversion unit 110, the second conversion unit 120, and the braking control unit 130 according to the selection of the selection switch 150. When decelerating the operation, the electric energy generated by the driving motor is supplied to the power source to be regenerated or controlled to be consumed as heat through the resistor.

Therefore, in this embodiment, when the electric energy can be regenerated by the power source, the energy regeneration method of regenerating the electric energy generated by the reverse drive of the drive motor at the time of the recommendation of the tower crane or the deceleration of the turning operation to the power source to prevent energy waste. If the electric energy cannot be regenerated by the power source, the electric energy generated by the reverse drive of the drive motor when the tower crane is rotated or when the swing drive is decelerated is driven by an energy regeneration method that consumes heat as heat.

Accordingly, two types of regenerative braking to power sources and braking through resistors can be selectively used according to site conditions, thereby actively changing various power sources (generators and transformers) according to frequent movements of tower cranes. Can cope

2 is a circuit diagram according to an embodiment of the electric energy regeneration device of the tower crane according to the present invention. As shown in Figure 2, it is possible to implement a circuit of the electric energy regeneration device of the tower crane using the IGBT element.

The first converter 110 is formed by providing a plurality of IGBT elements formed of a pair of transistors T1 to T6 and diodes D1 to D6 between the driving motor 200 and the second converter 120.

The second converter 120 is provided with a plurality of IGBT elements formed of a pair of transistors T7 to T12 and diodes D7 to D12 between the power source 300 and the first converter 110.

When the tower crane is hoisted or when the turning operation is increased, the first converting unit 110 operates as an inverter and the second converting unit 120 operates as a converter so that the three-phase AC input from the power source 300 is applied to the second. The rectifier is rectified by the diodes D7 to D12 of the IGBT element of the converter 120 to be converted into direct current, and the capacitor C is charged with a constant voltage current, and the constant voltage current charged in the capacitor C is converted into the first converter 110. In accordance with the switching control operation of the transistors T1 to T6 of the IGBT element of FIG. 1), it is converted into alternating current and applied to the driving motor 200 to operate the driving motor 200 as an electric motor.

At the time of recommendation or deceleration of the tower crane, the first converting unit 110 operates as a converter, and the second converting unit 120 operates as an inverter to generate alternating current generated by the drive motor 200 operating as a generator. Is rectified by the diodes D1 to D6 of the first conversion unit 120 and converted into direct current to charge the capacitor C with a constant voltage current, and the constant voltage current charged to the capacitor C is applied to the selection switch 150. According to the energy regeneration method according to the selection of the alternating current is converted back to the alternating current according to the switching control operation of the transistors (T7 to T12) of the second conversion unit 120 to regenerate to the power source 300, or to the heat through the resistor 140 Consumed.

When electrical energy is regenerated to the power source 300 through the second converter 120, the second converter 120 converts the direct current converted by the first converter 120 into the transistors T1 to T6 of the IGBT element. According to the selective switching control operation by) to convert into the alternating current of the same characteristics as the power source and outputs to the power source (300).

Therefore, by doing so, the present invention can regenerate and reuse the electric energy generated by the reverse driving of the drive motor when the tower crane is being unwinded or when the swinging operation is decelerated, thereby preventing energy waste.

Meanwhile, even when energy regeneration is not possible as a power source, the present invention consumes electric energy as heat to selectively use two methods of regenerative braking and braking through resistors according to site conditions. Since it can actively cope with the change in power source (generator, transformer), it is possible to achieve the object of the present invention as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. .

The invention is industrially applicable in the field of tower crane driving and its application.

100: electric energy regeneration device
110: first conversion unit
120: second conversion unit
130: breaking control
140: resistor
150: selector switch
160: switching control unit
200: drive motor
300: power source

Claims (5)

Including a first conversion unit and a second conversion unit, when the tower crane hoisting or increasing the swing operation, the first conversion unit acts as an inverter, the second conversion unit acts as a converter, so that the three-phase AC input from the power source Rectified by the second converter and converted to direct current to charge the capacitor with a constant voltage current, and the constant voltage current charged to the capacitor is converted to AC again by the first converter and applied to the drive motor so that the drive motor operates as an electric motor. At the time of recommendation or deceleration of the tower crane, the first converter operates as a converter, the second converter operates as an inverter, and the alternating current generated by the drive motor operating as a generator is rectified by the first converter. Converted to direct current, the capacitor is charged with a constant voltage current, and the constant voltage current charged to the capacitor is converted back into alternating current by the second converter to regenerate as a power source. In the electric energy regeneration device of the tower crane,
The electric energy regeneration device of the tower crane is:
A selection switch for selecting an energy regeneration method according to a user's manual operation;
According to the selection of the selection switch, the switching control unit for controlling to regenerate by supplying the electrical energy generated by the drive motor to the power source during the winding or deceleration of the swing operation of the tower crane or consumed by heat through the resistor;
Electrical energy regeneration device of the tower crane further comprising. The method of claim 1,
The electric energy regeneration device of the tower crane is:
A braking control unit that performs braking control of the driving motor against gravity or inertia when the tower crane is turned down or when the turning operation is decelerated;
A resistor for dissipating electrical energy generated by braking control of the driving motor by the braking control unit as heat;
Electrical energy regeneration device of the tower crane further comprising. delete 3. The method according to claim 1 or 2,
The second conversion unit:
The electrical energy regeneration device of the tower crane, characterized in that for converting the electrical energy converted by the first conversion unit to the electrical energy of the same characteristics as the power supplied to the power receiving end of the tower crane. 3. The method according to claim 1 or 2,
The second conversion unit:
Electric energy regeneration device of the tower crane, characterized in that the regeneration by supplying electrical energy to the energy collector.

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