JPS6332709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention centrally monitors the power consumption of cargo handling machines such as deck cranes, winches, and boom derricks that are mounted on ships and used for cargo handling of lumber, miscellaneous cargo, iron ore, etc. This invention relates to a power consumption control device for a cargo handling machine that can control the power consumption according to the generator capacity of the cargo handling machine.

Conventionally, when determining the generator capacity for a ship equipped with a large number of cargo handling machines, the overlap of the peak power of each crane was taken into consideration, and a value was selected that would allow the generator to operate normally even under the maximum load. There is. For this reason, even though the average power of each cargo handling machine is very small, the generator capacity is large and the cost is also very high. As the capacity of the generator increases, so does the capacity of the engine that drives the generator, which not only increases the amount of money, but also increases the dimensions and weight, and also increases the running cost.

Energy saving measures have become an important issue for ships due to rising fuel costs due to soaring oil prices. It is no exaggeration to say that the generator capacity and fuel consumption of a cargo handling machine are largely determined by the power consumption of the cargo handling machine.

The present invention centrally monitors the power consumption of multiple cargo handling machines installed on a ship in one place, controls the operation and power consumption of each cargo handling equipment, and suppresses the total peak power, thereby increasing the ship's generator capacity. This was done in an attempt to save energy on ships by making the generator smaller and at the same time allowing the generator to always operate under optimal load conditions (the point of highest efficiency).

Embodiments of the present invention will be described below with reference to the drawings.

First, the principle of the present invention will be explained. Figure 1 shows the operating principle of the present invention. 1 is a distribution board for lighting or space heaters for cargo handling machines installed on the ship's side, and this distribution board 1 shuts off the AC100V power. The power is branched off at CB, CB ₁ , CB ₂ , and CB ₃ to generate power for lighting or space heaters for each cargo handling machine. Now, power is supplied from the distribution board 1 to the lighting devices or space heater devices 7a, 7b, 7c of each cargo handling machine 6a, 6b, 6c via cables 15a, 15b, 15c to the central monitoring device 2 of the power consumption control device. from the central monitoring device 2 to the cables 16a, 16b, 16
c to the slave units 14a, 14b, 14c of the multiplex transmission device provided in each cargo handling machine, and from the slave units 14a, 14b, 14c of the multiplex transmission device to the lighting device or space heater device 7a, 7b, 7c.
will be communicated to.

In addition, a control signal for controlling the power consumption of the cargo handling machines is transmitted from the centralized monitoring device 2 to each cargo handling machine 6.
A, 6b, 6c transmit signals to the control devices 8a, 8b, 8c using cables 16a, 16b, 16c for supplying power to the lighting device or space heater device 7a, 7b, 7c. will be carried out.

Now, when each cargo handling machine 6a, 6b, 6c is operated, the controller 9a, 9b, 9 of each cargo handling machine
The operation command signal from c is sent to controllers 9a, 9
Control amplifiers 10a, 10b, 10c are used as speed command signals using voltage signals proportional to the inclination angles of
can be conveyed to. Control amplifiers 10a, 10b, 10
The signal transmitted to c is amplified and sent to the drive device 11
a, 11b, 11c, and the drive device 1
1a, 11b, and 11c are driven at a speed proportional to the applied signal.

On the other hand, the operation command signals from the controllers 9a, 9b, 9c are also transmitted to each control device 8a, 8b, 8c, and the slave units 14a, 14b,
14c, and is transmitted to the main device 13 of the multiplex transmission device of the central monitoring device 2 via power cables 16a, 16b, and 16c for lighting or space heaters. The operation signal transmitted to the master device 13 of the multiplex transmission device is transmitted to the arithmetic and control device 12.

The arithmetic and control device is provided on the ship side and is detected by a power detector 3 (a current detector may be used) provided in a generator 4 for supplying electric power to the cargo handling machines 6a, 6b, 6c, and performs calculations. The power consumption Pm of the cargo handling machine, which is transmitted to the control device 12, is compared to the ship's optimal power consumption Px (where the efficiency of the engine and generator is highest), which has been set in advance by the adjustable power consumption setting device 5. If Pm≧Px, the controller 9 of the cargo handling machine
The operation signals from the cargo handling machines 6a, 9b and 9c determine the operation of each cargo handling machine and the combination of the movements.
Calculate the approximate power consumption of b and 6c. Furthermore,
In order to prevent peak power from being generated, interlock signals are sent to the drives of each cargo handling machine that are not in operation to prevent overlapping operations, and when they are in operation, a command to reduce speed is sent to the drive units, and at the same time the power consumption of each cargo handling machine is reduced. In order to reduce power consumption, the main device 13 of the multiplex transmission device of the central monitoring device 2 sends a speed-down command signal to the driving device of each cargo handling machine in operation;
Slave units 14a and 14 of the multiplex transmission device of each cargo handling machine
b, 14c and control devices 8a, 8b, 8c to each control amplifier 10a, 10b, 10c to control the power consumption of each drive device so that Pm<Px.

The above is the basic operating principle of the device of the present invention. According to the device, a speed-down feedback signal is continuously sent from the arithmetic control device 12 to the drive device of each cargo handling machine in proportion to the amount of Pm≧Px. It is possible to continuously control the power consumption of cargo handling machines by sending
It is also possible to control power consumption in stages by transmitting ON and OFF contact signals to the control device in stages and feeding back a constant signal from a potentiometer prepared in advance to the control amplifier in stages. It is.

In addition, the embodiments of this device are roughly classified into two types, electric type and hydraulic type, depending on the difference in drive device, but either type can be used in the present invention.

Hereinafter, to explain specifically, as an example, the second
The figure shows a hydraulic type hoisting winch for a jib crane as an example. Variable displacement hydraulic pump 22a
A hydraulic hoisting winch is provided in which a hydraulic motor 35a for driving a hoisting wire drum 37a is operated by a tilting cylinder 26a connected to a swash plate or a tilting shaft of the hydraulic pump. The cylinder is provided with an electromagnetic pressure control valve 27a, and a command signal from the controller 9a is given to the control amplifier 10a as a signal from a potentiometer provided in the controller, and the command signal from the control amplifier is proportional to the tilting angle of the controller. The electromagnetic pressure control valve 27a is actuated by the output signal, and the tilting cylinder 26a is actuated to control the swash plate or oblique shaft angle of the hydraulic pump 22a.
The amount of oil from the hydraulic pump is controlled, and the hydraulic motor 3
It is for adjusting the rotation of 5a.

Note that the hydraulic pump 23a is an electromagnetic directional switching valve 28a.
It is a control pump used to control the electromagnetic pressure control valve 27a, etc., and the relief valve 29
a is used to keep the control circuit pressure constant, and relief valves 32a and 33a are used to control the hydraulic motor 3 when letting out and winding the wound wire rope.
These are various safety devices to protect 5a from overload. The check valves 31a and 34a are for giving directionality to the flow in the hydraulic circuit, the accumulator 30a is for absorbing surge pressure and softening pressure fluctuations in the circuit, and the throttle valves 41a and 42a are for giving direction to the flow in the hydraulic circuit. This is to adjust the flow rate to prevent the jumping phenomenon.

The filter 25a is for preventing foreign matter from entering the hydraulic circuit, and the electromagnetic directional switching valve 28a is operated by the contact signal _YH of the command signal from the controller 9a, and the hydraulic motor 35a and the hoisting wire drum 37a are operated. This is to operate a hydraulic brake cylinder 36a installed between the two.

Now, when the hoisting winch is operated, an operation command signal from the hoisting winch controller 9a is transmitted to the control amplifier 10a as a signal from a potentiometer (not shown) provided in the controller. The control amplifier 10a transmits this operation command signal to the electromagnetic pressure control valve 27a via a contact point 39a or 40a of a limit switch for detecting the winding or unwinding direction, which operates in conjunction with the operating lever of the controller 9a.

The electromagnetic pressure control valve 27a controls the tilting cylinder 26a by an output signal from the control amplifier 10a proportional to the tilting angle of the controller, controls the swash plate or the slant shaft angle of the hydraulic pump 22a, and controls the hydraulic pump 22a. The amount of oil from 22a is controlled to drive and control the hydraulic motor 35a.

On the other hand, the operation command signal from the hoisting winch controller 9a is transmitted to the control amplifier 10a, and at the same time, is also transmitted to the control device 8a, which operates the relay 18a provided in the control device, and outputs the contact signal. The electromagnetic directional control valve 28a is operated, and the hydraulic brake cylinder 36a is operated. At the same time, the hoisting winch operation command signal is transmitted to the handset 14a of the multiplex transmission device using a contact signal. The signal transmitted to the slave device 14a of the multiplex transmission device is a cable for supplying power from the distribution board 1 for the lighting or space heater of the cargo handling machine provided on the ship side to the lighting device 7a of the cargo handling machine 6a. 1
6a to the main unit 13 of the multiplex transmission device of the centralized monitoring device 2 provided on the ship side. The operation signal transmitted to the base unit of the multiplex transmission device is transmitted to the arithmetic and control unit 12. The arithmetic and control device 12 is provided on the ship side, and the consumption of the cargo handling machine is detected by the power detector 3 provided in the generator 4 for supplying power to the cargo handling machine 6a and transmitted to the arithmetic and control device 12. The power consumption Pm is matched with the ship's optimum power consumption Px, which has been set in advance by the power consumption setting device (adjustable type) 5. If Pm≧Px, the operation signal from the controller 9a of the cargo handling machine 6a determines the operation of the cargo handling machine and its combination (in the case of a jib crane, the three operations of hoisting, hoisting, and turning can be considered for one crane). In order to calculate the approximate amount of power consumption and to prevent peak power from occurring due to overlapping operations of each cargo handling machine, for the drive devices 11a, 11b, 11c of each cargo handling machine 6a, 6b, 6c that are not in operation, In order to prevent overlapping operations, an interlock signal to stop operation is transmitted, and when the machine is operated, a command to reduce speed is transmitted to each cargo handling machine 6a, 6 in order to reduce the power consumption of each cargo handling machine.
Drive devices 11a, 11b, 1 during operation of b, 6c
1c, a speed-down command signal is sent from the master device 13 of the multiplex transmission device of the central monitoring device 2 to the slave device 1 of the multiplex transmission device via the cable 16a.
Tell 4a.

The slave unit 14a of the multiplex transmission device is activated by the transmitted signal to relay 1 provided in the slave unit of the multiplex transmission device.
7a is activated, a command signal for waiting for operation is transmitted to the control device 8a by a contact signal, and at the same time, a command signal for speeding down is transmitted to the control amplifier 10a,
The power consumption of the drive device 11a is controlled so that Pm<Px.

The above explanation has been given using the hoisting winch of a jib crane as an example, but the operating principle is the same for hoisting devices and slewing devices, and it can be applied to all types of deck material handling machines such as cargo winches, jib cranes, and central systems. is possible. Further, in this embodiment, a hydraulic type was explained as an example, but in the case of an electric type, the conduction angle of the thyristor provided at the input of the motor is controlled by the output from the control amplifier.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

In addition, although this device has been explained using an example of a system in which signals are sent and received using lighting for each cargo handling machine or a power cable for a space heater, it is possible to use one cable (one core or two cores) to send and receive signals. It may be configured to be provided exclusively for core wires).

As described above, according to the device of the present invention, (i) peak power of the crane can be suppressed by using the device, so the generator capacity (including engine capacity) of the ship can be significantly reduced; (ii) In addition to the above, always control the power consumption of the load to achieve optimal conditions (where the efficiency is highest)
(iii) A multiplex transmission device is used to exchange signals to control peak power and power consumption of cargo handling machines, and lighting or space heaters are transmitted from the ship to each cargo handling machine. Since the AC power cable provided for use is used for this purpose, the cables and wiring costs associated with installing this device are completely unnecessary, and the equipment is simple and cost-effective. It can have a great effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the operating principle of the device of the present invention, and FIG. 2 is a diagram showing an example in which the device is applied to a hoisting winch in a jib crane. 1... Distribution board for lighting or space heater, 2...
Central monitoring device, 3... Power detector, 4... Generator, 5
...Adjustable power consumption setting device, 6a, 6b, 6c...
Cargo handling machine, 8a, 8b, 8c...control device, 9a,
9b, 9c...controller, 10a, 10b, 1
0c...Control amplifier, 11a, 11b, 11c...Drive device, 12...Arithmetic and control device, 13...Main device of multiplex transmission device, 14a, 14b, 14c...Slave device of multiplex transmission device, 22a...Variable displacement hydraulic pump, 35
a...Hydraulic motor.

Claims (1)

[Claims] 1. A drive device, a control amplifier that controls the drive device, a controller that provides an operation command signal to the control amplifier, a multiplex transmission device slave device, a device connected to the multiplex transmission device slave device for sending and receiving signals, and that is controlled by the control amplifier. A plurality of cargo handling machines equipped with a control device adapted to transmit signals, and the actual power consumption of the cargo handling machines as detected by a power detector installed in a generator that supplies power to the drive device of the cargo handling machines. and a preset expected power consumption, and if the power consumption of the cargo handling machine exceeds the preset power consumption, a signal is sent from the controller of the cargo handling machine in operation via the control device and the multiplex transmission device slave unit. Based on the operation signal received, the approximate power consumption of each cargo handling machine is calculated from the operation and combination of the operations of each cargo handling machine, and the control device is sent to the control device via the multiplex transmission device to slow down or stop the drive device of each cargo handling machine. a central monitoring device comprising an arithmetic and control unit capable of controlling the power consumption of the cargo handling machine by sending an instruction signal to control the load handling machine; and a multiplex transmission device main device that transmits and receives operation signals and instruction signals to the multiplex transmission device slave device and the multiplex transmission device slave device. A power consumption control device for a cargo handling machine characterized by the following.