CN101293621A - Rubber-tyred jib crane with auxiliary power source for recovering potential energy - Google Patents

Abstract

The invention relates to a tire jib crane with recovery potential energy auxiliary power source, including a hoisting mechanism, a slewing mechanism, a luffing mechanism, a traveling mechanism and a power mechanism of the crane, and a supercapacitor is connected in parallel to the DC bus of the power mechanism , which is characterized in that: the supercapacitor, a bidirectional DC/DC converter, a DSP controller, and an energy consumption circuit form an auxiliary power source for recovering potential energy, and the supercapacitor is connected in parallel to the voltage stabilizing capacitor of the DC bus through the bidirectional DC/DC converter , the DSP controller is connected with the bidirectional DC/DC converter and the energy consumption circuit, and the energy consumption circuit is connected in parallel with the DC bus. Beneficial effects: the dual power source powered by the internal combustion-generator set and the supercapacitor, and the recovered potential energy composed of the supercapacitor is used to assist the power source, so that the supercapacitor and the generator set can jointly supply power for the system, effectively improving the stability of the power unit of the tire jib crane sex. It saves energy, has no noise, and can also reduce the installed capacity of the whole machine, reducing the impact on the crane's power system.

Description

Rubber-tyred jib crane with auxiliary power source for recovering potential energy

technical field

The invention belongs to tire jib cranes, in particular to a tire jib crane with an auxiliary power source for recovering potential energy.

Background technique

The tire jib crane is the most commonly used loading and unloading machinery for port terminals and various construction projects. It can travel long distances, flexibly change the working site, and has good mobility. At present, the power drive of a tire jib crane is to use an internal combustion engine to drive a generator set to generate electricity and then drive an electric motor to lift heavy objects. Its operation is characterized by periodic and intermittent operations, frequently raising and lowering, starting and braking goods ranging from several tons to dozens of tons. Due to the large load change, starting and braking are required to be completed in just a few seconds, which requires a lot of power, which brings the following unfavorable factors to the traditional tire jib crane:

1. The installed capacity of internal combustion engine and generator power supply is required to be large. In order to meet the short-term and high-power operation requirements of the tire jib crane, the power unit of the tire jib crane powered by an internal combustion engine must be equipped with a large-capacity and high-power generator, which greatly increases the overall capacity of the tire jib crane. When starting, the internal combustion engine must increase the throttle to supply a large amount of fuel quickly, which seriously leads to increased noise of the diesel engine, incomplete fuel combustion, and black smoke emission, causing environmental pollution, increasing fuel consumption, and increasing operating costs;

2. The regenerative energy has not been reasonably utilized during the working process of the tire jib crane. The falling potential energy of the tire jib crane can only be consumed by energy braking, which wastes energy and increases the thermal pollution of the whole machine;

3. The impact is very large, and the whole machine of the tire jib crane is not stable enough. Due to the short-term frequent starting of high-power, it has a great impact on the load of the unit and the power system of the whole machine, and it is easy to cause damage to electrical equipment.

Contents of the invention

The present invention aims to overcome the deficiencies in the prior art, and provides a tire jib crane with an auxiliary power source for recovering potential energy. The supercapacitor is used to recover the potential energy when the hoisting mechanism of the crane descends, which can be used as the energy required for supplying the crane. Reduce the impact on the crane power system during energy feedback, greatly reducing the installed capacity of the whole machine.

In order to achieve the above object, the present invention is achieved through the following technical solutions: a tire jib crane with an auxiliary power source for recovering potential energy, including a hoisting mechanism, a slewing mechanism, a luffing mechanism, a traveling mechanism and a power mechanism of the crane. The above-mentioned power mechanism is generated by an internal combustion generator set to provide working power for driving the hoisting mechanism, slewing mechanism, luffing mechanism and running mechanism; the supercapacitor is connected in parallel to the DC bus, and is charged and discharged according to the change of the DC bus voltage. As another source of power to provide power for each working mechanism. When each working mechanism is in the braking state, the electric energy is fed back to the supercapacitor, and the supercapacitor is continuously charged with the feedback energy. When the working mechanism needs power, the supercapacitor continuously releases electric energy. As the supercapacitor continues to discharge, its terminal voltage drops, and the DC bus voltage drops accordingly. When the voltage is lower than the power rectification voltage of the diesel generator set, the diesel generator set starts to participate Power supply, which is characterized in that: the supercapacitor, a bidirectional DC/DC converter, a DSP controller, and an energy consumption circuit form an auxiliary power source for recovering potential energy, and the supercapacitor is connected in parallel to the voltage stabilizing capacitor of the DC bus through the bidirectional DC/DC converter Above, the DSP controller is connected with the bidirectional DC/DC converter and the energy consumption circuit, and the energy consumption circuit is connected in parallel with the DC bus.

The energy consumption circuit is composed of a dynamic buffer and a power consumption resistor, the dynamic buffer is connected with the DSP controller, and the dynamic buffer is connected in parallel with the DC bus through the power consumption resistor.

The bidirectional DC/DC converter is composed of three low-power bidirectional DC/DC converters connected in parallel.

Beneficial effects of the present invention: the recovery potential energy auxiliary power source composed of supercapacitors is adopted, and the supercapacitor and the generator set jointly supply power to the system, effectively improving the stability of the power unit of the tire jib crane. At the same time, it has the following advantages:

1. Use the supercapacitor to recover the regenerative energy fed back by the hoisting mechanism as the energy required for the crane to work, saving energy;

2. Use supercapacitors as auxiliary power sources to supply power to the system, without noise, and can also reduce the installed capacity of the whole machine;

3. The recovery of regenerative energy reduces the impact on the crane power system.

Description of drawings

Fig. 1 is the circuit connection schematic diagram that the present invention adopts alternator;

Fig. 2 is the circuit connection schematic diagram that the present invention adopts DC generator;

Fig. 3 is a system control flowchart of the present invention.

Detailed ways

Below in conjunction with preferred embodiment, the specific implementation mode provided according to the present invention is described in detail as follows:

A tire jib crane with an auxiliary power source for recovering potential energy, including a hoisting mechanism, a slewing mechanism, a luffing mechanism, a traveling mechanism and a power mechanism of the crane. The power mechanism is generated by an internal combustion generator set and provided for driving The working power of the hoisting mechanism, slewing mechanism, luffing mechanism and traveling mechanism; connect the supercapacitor in parallel to the DC bus, charge and discharge according to the change of the DC bus voltage, and serve as another power source to provide power for each working mechanism. When each working mechanism is in the braking state, the electric energy is fed back to the supercapacitor, and the supercapacitor is continuously charged with the feedback energy. When the working mechanism needs power, the supercapacitor continuously releases electric energy. As the supercapacitor continues to discharge, its terminal voltage drops, and the DC bus voltage drops accordingly. When the voltage is lower than the power rectification voltage of the diesel generator set, the diesel generator set starts to participate powered by. The supercapacitor, a bidirectional DC/DC converter, a DSP controller, and an energy consumption circuit form an auxiliary power source for recovering potential energy. The supercapacitor is connected in parallel to the voltage stabilizing capacitor of the DC bus through the bidirectional DC/DC converter, and the DSP controller and The bidirectional DC/DC converter is connected to the energy consumption circuit, and the energy consumption circuit is connected in parallel with the DC bus. The energy consumption circuit is composed of a dynamic buffer and an energy consumption resistor, and the dynamic buffer is connected with the DSP controller and connected in parallel with the DC bus through the energy consumption resistor.

Working principle: The internal combustion generator set starts to charge the supercapacitor from the no-load start, and stops charging when the supercapacitor is charged to a certain level, and enters the coordination work stage of the generator set and the supercapacitor. When the hoisting motor is in the energy feedback state, the energy is charged to the supercapacitor by the DC bus through the bidirectional DC/DC converter. At this time, the DC bus voltage and the supercapacitor voltage are detected in real time. When the supercapacitor voltage exceeds the set maximum value and the DC bus voltage continues to rise, it is considered that the capacitor energy is fully charged, and the excess potential energy is consumed by the dynamic buffer (energy consumption circuit). When each mechanism is in the state of energy consumption, the supercapacitor supplies power to the working motors of each mechanism through a bidirectional DC/DC converter. There is a power rectifier at the connection between the generator set and the DC bus to ensure that the discharge current of the supercapacitor cannot flow back to the generator set and is fully supplied to the working mechanism. At this time, the DC bus voltage and the supercapacitor voltage are detected in real time. When the supercapacitor voltage is lower than the set minimum value and the DC bus voltage continues to drop, it is considered that the capacitor energy has been discharged, and the working mechanism is transferred to the generator set to continue to work. The DSP controller monitors the change of the DC bus voltage. When the hoisting mechanism motor regenerates the feedback power to cause the DC bus voltage to rise, the super capacitor enters the charging state. With the continuous charging of the super capacitor, its terminal voltage rises, and the super capacitor absorbs the energy. The regenerative energy fed back by the lifting mechanism. When the working mechanism is in the action of needing energy supply, the motor of the working mechanism works to cause the voltage of the DC bus to drop, and the supercapacitor is discharged. As the supercapacitor continues to discharge, its terminal voltage drops, and the electric energy stored in the supercapacitor is gradually released.

Setting the recovery potential energy auxiliary power source composed of super capacitors can reduce the power configuration of the internal combustion engine, so that it can always work near the rated high-efficiency area, and the fuel can be fully burned, which not only reduces exhaust emissions but also reduces the noise pollution of the whole machine. At the same time, the energy consumption resistance is basically the same. Heat generation, reduce thermal pollution to the environment. The supercapacitor is a new type of energy storage element. The energy storage process is reversible. Its capacitance can be as high as farads or even tens of thousands of farads. It can realize fast and large current charging and discharging, and has higher power density than batteries (can be 1,000W/kg order of magnitude) and longer cycle life (charge and discharge times up to 1 million times), and can be used in extremely harsh environments such as low temperature, and has no environmental pollution. The supercapacitor is connected in parallel to the DC bus through a bidirectional DC/DC converter, so that the supercapacitor and the generator set jointly supply power to the system.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the structure of the present invention in any form. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (3)

1. one kind has the tire arm derrick crane that reclaims the potential energy auxiliary power source, lifting mechanism, swing type mechanism, luffing mechanism and the traveling gear and the actuating unit that comprise hoisting crane, described actuating unit is provided for driving lifting mechanism, swing type mechanism, luffing mechanism and traveling gear operation power by the generating of internal combustion engine generator group; Super capacitor is connected in parallel on the dc bus, charges, discharge, provide power for each operating mechanism as another propulsion source in variation according to DC bus-bar voltage; When each operating mechanism was in braking mode, the feedback electric energy was given super capacitor, and the energy that super capacitor constantly obtains feeding back charges; When operating mechanism needs power, super capacitor constantly discharges electric energy, along with super capacitor constantly discharges, its terminal voltage descends, dc bus voltage and then descends, when voltage is lower than the mains rectified voltage of diesel powerplant, diesel powerplant begins to participate in power supply, it is characterized in that: described super capacitor and two-way DC/DC changer, dsp controller, the energy consumption circuit is formed recovery potential energy auxiliary power source, super capacitor is parallel on the electric capacity of voltage regulation of dc bus through two-way DC/DC changer, dsp controller is connected with two-way DC/DC changer and energy consumption circuit, and the energy consumption circuit is in parallel with dc bus.

2, the tire arm derrick crane that reclaims the potential energy auxiliary power source that has according to claim 1, it is characterized in that: described energy consumption circuit is made up of dynamic buffer and energy consumption resistance, described dynamic buffer is connected with dsp controller, and dynamic buffer is in parallel with dc bus by energy consumption resistance.

3, the tire arm derrick crane that reclaims the potential energy auxiliary power source that has according to claim 1, it is characterized in that: described two-way DC/DC changer is made of the parallel connection of three two-way DC/DC changers of miniwatt.

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