JP2011230864A - Electricity storage control device for vertical conveying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electricity storage control device 10 that effectively works even when either power running or regenerative operation is continued and reduces a load of a primary power supply 80 in a vertical conveying machine 90.SOLUTION: Before or at the time of stopping a conveying table, an auxiliary power unit 13 decides whether the amount of electricity charged to an electric storage device 14 reaches a predetermined value or not. The storage device is charged if the predetermined value is not reached. Next start is enabled on condition that the predetermined value is reached. The power to be used by the primary power supply 80 is reduced through discharging from the electric storage device 14. The power to be used by the primary power supply 80 is controlled not to become a maximum value when the conveying table starts to move. On the other hand, the electric storage device 14 is discharged for 3 to 10 seconds only when the conveying table starts to move.

Description

  The present invention relates to control of electric power supplied to a main motor that drives a vertical transfer machine, and more particularly, to a power storage control device that reduces a load on a primary power supply facility by including a power storage device.

  A vertical conveyance machine that conveys articles in a factory has almost the same structure as an elevator that conveys people in a building or the like. In both cases, a car or a carriage is usually connected to one side of a rope hung on a hoist, and a weight is connected to the other side. The weight of the weight is made larger than the weight of the car or the carriage so that the load fluctuation of the electric motor that drives the hoisting machine is reduced.

  In a vertical transfer machine, when lifting a load from the bottom to the top, the combined weight of the transfer table and the load is greater than the weight of the weight in the lifting step of the transfer table, and in the lowering process of the transfer table, The weight becomes larger than the weight of the transport table that is empty. For this reason, a large load is usually applied to the electric motor that drives the hoisting machine in both the ascending process and the descending process. That is, when performing an operation of lifting a load from the bottom to the top, the vertical transfer machine is in a power running operation in the lifting process and the lowering process of the transfer table.

  In a vertical transfer machine, when unloading a load from top to bottom, the weight of the transfer table and the load is greater than the weight of the weight in the lowering process of the transfer table. The weight becomes larger than the weight of the transport table that is empty. For this reason, normally, in both the ascending process and the descending process, almost no load is applied to the electric motor that drives the hoisting machine, and the electric power generated by the electric motor can be recovered. That is, when performing an operation of lowering the load from the top to the bottom, the vertical transfer machine can perform a regenerative operation in the lifting process and the lowering process of the transfer table.

  Similarly, in an elevator, regenerative operation can be performed in a descending process in which a large number of people ride and an ascending process of an empty car, and the electric power generated by the electric motor can be regenerated. Patent Document 1 describes a power storage control device that saves energy by effectively using regenerative power and enables an elevator to operate even during a power failure.

  However, a vertical transporter that transports luggage in a warehouse or factory has different requirements than an elevator. Therefore, the present inventors conducted intensive research on power storage devices and control devices in industrial vertical transporters. As a result, it has been concluded that what is required in the vertical conveyor is more important to reduce the load on the power supply on the primary side than to save energy in an elevator.

  In other words, it is possible to save energy by providing a power storage device and a control device in an industrial vertical transfer machine, but this is a case where power running operation and regenerative operation are alternately performed to some extent regularly. Limited. Actually, only one of the power running operation and the regenerative operation is continued, and it is difficult to save energy unless a power storage device having a very large capacity is installed. Moreover, the industrial vertical conveyance machine does not need to be provided with an emergency power supply as in an elevator.

JP 2009-143711 A

  An object of the present invention is to provide a power storage device and a control device for an industrially used vertical transfer machine that reduce a load on a primary power supply facility. And it is providing the electrical storage control apparatus which functions effectively, even when only one of a power running operation or a regenerative operation is performed continuously. It is another object of the present invention to provide a power storage control device that can keep equipment costs low.

  The storage control device for a vertical conveyor according to claim 1 of the present invention is an industrial vertical conveyor in which a carriage is connected to one side of a rope hung on a hoist and a weight is connected to the other side. A power storage control device used in a machine, wherein it is determined whether or not the power storage device has reached a predetermined amount of charge before or when the transfer platform is stopped, and charging is performed when the predetermined amount of charge has not been reached. Then, control is performed so that the next start is possible on condition that the predetermined amount of charge has been reached, and the power consumption of the primary side power source is reduced by discharging the power storage device when starting the carrier. The means to control is adopted.

  According to claim 2 of the present invention, there is provided a storage control device for a vertical transfer machine according to claim 1, wherein the power consumption of the primary power source is maximum when the transfer platform starts. A means for controlling so as not to become a value is adopted. According to a third aspect of the present invention, there is provided a power storage control device for a vertical transfer machine according to claim 1 or 2, wherein the discharge time of the power storage device is 3 to 10 seconds. Means. Furthermore, a power storage control device for a vertical transport machine according to claim 4 of the present invention is the power storage control device for a vertical transport machine according to any one of claims 1 to 3, wherein the power storage device is connected to the transport platform. A means for discharging only when starting is employed.

  According to a fifth aspect of the present invention, there is provided a storage control device for a vertical transfer machine according to any one of the first to fourth aspects, wherein the vertical transfer machine performs a regenerative operation. In some cases, means for controlling the power storage device to be charged by regenerative power is employed. Furthermore, the storage control device for a vertical transport machine according to claim 6 of the present invention is the storage control device for a vertical transport machine according to any one of claims 1 to 5, wherein the power storage device is an electric double layer capacitor. A certain method is adopted.

  The power storage control device of the present invention can reduce the power used by the primary power supply by placing the power storage device in a discharged state when the carriage is started. In other words, it is possible to reduce the maximum power consumption of the vertical conveyor and to reduce the maximum power consumption of the entire equipment in which it is installed. Further, by making this the main role of the power storage device, it is possible to reduce the size of the power storage device and reduce the installation cost related to the vertical transfer machine. And as long as a vertical conveyance machine operates, it can be set as the electrical storage apparatus which always works effectively.

It is a schematic perspective view which shows an example of the vertical conveying machine used as the object of this invention. It is a block diagram which shows the outline | summary of the electrical storage control apparatus of this invention. It is explanatory drawing which shows a charging / discharging pattern in case a vertical conveying machine continues power running operation. It is explanatory drawing which shows a charging / discharging pattern in case a vertical conveying machine continues regenerative operation. It is a flowchart which shows the flow of operation | movement in the electrical storage control apparatus of this invention.

  FIG. 1 shows an example of an industrial vertical transfer machine that is an object of the present invention. The vertical carrier 90 has a carrier 92 connected to one side of a rope 95 hung on a hoisting machine 91 and a weight 93 connected to the other side. The hoisting machine 91 is often installed at the uppermost part of the frame body 94 and includes a ring body around which the rope 95 is hung and an electric motor that drives the ring body.

  The rope 95 is used to include all other usable strips such as a chain in addition to a commonly used wire rope. The transport table 92 is provided with a conveyor such as a roller conveyor or a chain belt conveyor on the floor surface, and can automatically receive and pay out a package. In addition, on each floor where the transfer table 92 stops, a horizontal transfer machine 96 that supplies and discharges packages is installed. The conveyor table 92 stops so that the conveyor surface and the conveyor surface of the horizontal conveyor 96 are at substantially the same level.

  The industrial vertical transfer machine 90 is characterized in that the same operation is often repeated for a certain period of time. For example, the operation of transporting a package from the first floor to the third floor is repeated dozens of times, and the package is often in the same form. In such a case, the worker can automatically repeat the work by inputting the contents on the operation panel. Then, the work can be continued until the worker inputs the work end or until the machine automatically detects that there is no load to be transported.

  As illustrated in FIG. 2, the present invention relates to a power storage control device 10 that controls electric power supplied to an electric motor that drives a vertical transfer machine 90. The electric power from the primary side power supply 80 is sent to the vertical transfer machine 90 via the inverter unit 11. The inverter unit 11 supplies AC power in a state required by the vertical transfer machine 90, supplies power for charging the power storage device 14 via the auxiliary power supply device 13, and receives power generated by discharging the power storage device 14. Can be. Further, the power storage device 14 can be charged by receiving regenerative electric power from the vertical transfer machine 90. These operations are controlled by the lifting control device 12.

  Therefore, the power storage control device 10 of the present invention includes the inverter unit 11, the lift control device 12, the auxiliary power supply device 13, the power storage device 14, and the braking resistor 15. And this electrical storage control apparatus 10 performs the control method considered most advantageous in the industrial vertical conveyance machine 90. FIG.

  In FIG. 2, the primary power source 80 is a facility for supplying power purchased from an electric power company to the vertical carrier 90. In the inverter unit 11, the AC power from the primary power source 80 is once converted into DC, and then converted again into AC in a state suitable for the requirements of the hoisting machine and output. Thereby, the speed and acceleration of the vertical conveyance machine 90 can be set arbitrarily.

  Further, the inverter unit 11 can charge the power storage device 14 by converting AC power from the primary side power supply 80 into direct current and supplying it to the power storage device 14. Alternatively, the DC power discharged from the power storage device 14 can be received and output as AC power in a state suitable for the hoisting machine. Furthermore, the electric power generated in the regenerative operation of the vertical transfer machine 90 can be converted into direct current and supplied to the power storage device 14 to charge the power storage device 14. At this time, when the power storage device 14 reaches a predetermined amount of charge, surplus power can be consumed by the braking resistor 15.

  As the power storage device 14, an electric double layer capacitor or a lithium ion secondary battery can be used. As the capacity of the power storage device 14, it is preferable that more than half of the maximum power consumed by the motor in powering operation can be borne by discharging when the carriage 92 starts. The amount of discharge at this time is sufficient if the discharge time is considered to be 3 to 10 seconds. In the following description, a state where the power storage device 14 has reached a predetermined charge amount is simply referred to as a fully charged state.

  Charging and discharging of the power storage device 14 is performed via the auxiliary power supply device 13, and the auxiliary power supply device 13 is controlled by the lifting control device 12. Auxiliary power supply device 13 can receive power from inverter unit 11 and charge power storage device 14 according to a command from lift control device 12. This command includes an initial charge at the start of work of the vertical transfer machine 90 and a stop charge after discharge in the work cycle. At this time, the fully charged state of the power storage device 14 is detected by the auxiliary power supply device 13 and sent to the elevation control device 12.

  The auxiliary power supply device 13 sends a preparation completion signal indicating that the conditions necessary for operation are met to the lift control device 12. Then, the auxiliary power supply device 13 can discharge the power storage device 14 and supply it to the inverter unit 11 according to a command from the lifting control device 12. In the power storage control device 10 of the present invention, the facility can be downsized by only discharging the power storage device 14 at the start-up discharge that is performed when the carriage 92 is started.

  The lifting control device 12 can issue a command to the inverter unit 11 and the auxiliary power supply device 13 according to a command (not shown) from the operator and the vertical transfer machine or according to a programmed procedure. For example, the elevating control device 12 transmits commands such as starting, stopping, and speed of the motor to the inverter unit 11, and transmits charging or discharging commands to the auxiliary power supply device 13. With such a configuration, the power storage control device 10 of the present invention controls the power supplied to the main motor of the vertical transfer machine 90.

  FIG. 3 shows the state of charge / discharge during powering operation by the power storage control device 10 of the present invention. In other words, the charge / discharge pattern when driving to lift the load to the upper floor is shown with the passage of time as the horizontal axis. When the operation signal changes from OFF to ON, the motor of the hoisting machine is activated, the rotation speed is accelerated, and is kept constant at a predetermined speed. When the operation signal changes from ON to OFF, the rotation speed of the electric motor is decelerated and stops.

  The output current of the inverter unit 11 rapidly rises at the time of start-up, reaches a maximum value, decreases, and then changes at a constant value. This indicates that there is a peak in power usage when the carriage 92 starts. And when the electrical storage apparatus 14 is not used, the usage current of the primary side power supply 80 used as the input current of the inverter part 11 also becomes the same pattern as this.

  In the power storage control device 10 of the present invention, the current of the primary power source 80 is reduced by discharging the power storage device 14 for a certain period of time when starting up. The time for discharging is a short time (several seconds) as shown in the figure. As a result, the operating current of the primary power supply 80 rises gently as shown in the figure, and can reach a constant current value without having a peak.

  When the operation signal changes from ON to OFF, the rotation speed of the electric motor is decelerated and stopped, and the output current of the inverter unit 11 is also zero. At the time of this stop, the power storage device 14 is stopped and charged by the electric power of the primary side power supply 80. Here, the necessary amount of power is charged at the next start-up, and the operation signal can be changed from OFF to ON for the next start of the carriage 92 on the condition that the full charge has been reached. ing.

  FIG. 4 shows the state of charge / discharge during regenerative operation by the power storage control device 10 of the present invention. In other words, the charge / discharge pattern in the case of driving to lower the load to the lower floor is shown with the passage of time as the horizontal axis. As in the case of the power running operation, when the operation signal changes from OFF to ON, the hoisting motor is started, the rotation speed thereof is accelerated, and is kept constant at a predetermined speed. When the operation signal changes from ON to OFF, the rotation speed of the electric motor is decelerated and stops.

  The output current of the inverter unit 11 is required only for a short time at startup. And since the electric current which flows is small compared with a power running operation, this can be covered only by discharge of the electrical storage apparatus 14. FIG. After the output current of the inverter unit 11 becomes 0, the motor of the hoisting machine functions as a generator. The power storage device 14 can be regeneratively charged with this power, and in many cases, a necessary amount of power can be charged at the next start-up.

  When the operation signal changes from ON to OFF, the rotation speed of the electric motor is decelerated and stops. At this time, when the regenerative charging is insufficient and the power storage device 14 has not reached full charge, the power storage device 14 is powered by the power from the primary power supply 80 while it is stopped, as in the case of powering operation. Stop charging. Similarly to the power running operation, the operation signal can be changed from OFF to ON for the next start of the carriage 92 on the condition that the battery has been fully charged.

  FIG. 5 simply shows a flow of one cycle in the power storage control device 10. At the beginning of the cycle, a startup discharge signal is sent from the lift control device 12 to the auxiliary power supply device 13. As a result, discharging of the power storage device 14 is started and raising / lowering of the vertical transfer machine 90 is started. After starting the raising / lowering, the auxiliary power supply 13 determines whether this operation is a power running operation or a regenerative operation.

  In the case of the regenerative operation, the regenerated electric power is sent to the power storage device 14 to be charged and charged until the fully charged state is reached. When the regenerative operation state continues after reaching full charge, the regenerated electric power is consumed by the braking resistor 15. After reaching the full charge, the regenerative operation state is eventually finished, and the vertical transfer machine 90 stops. In the case of the power running operation, the process waits for the vertical transfer machine 90 to stop.

  After the vertical transfer machine 90 stops, the auxiliary power supply device determines whether or not the power storage device 14 is fully charged. Usually, the stop after performing the regenerative operation is in a fully charged state, and the stop after performing the power running operation is not in a fully charged state. If it is in the fully charged state, the cycle is terminated as it is, and if it is not in the fully charged state, the cycle is ended after the power storage device 14 is in the fully charged state.

  As described above, the power storage control device 10 of the present invention reduces the maximum power consumption of the primary-side power supply 80 by using the power storage device 14 in a discharged state when the carriage 92 is started, and is used in a state with little fluctuation. can do. Therefore, it is possible to reduce the power receiving facility of the entire facility where the vertical transfer machine 90 is installed, or to suppress an increase in contract power. Further, the power storage device 14 is small and can sufficiently function.

DESCRIPTION OF SYMBOLS 10 Power storage control apparatus 11 Inverter part 12 Elevation control apparatus 13 Auxiliary power supply apparatus 14 Power storage apparatus 15 Braking resistor 80 Primary side power supply 90 Vertical conveyance machine 91 Hoisting machine 92 Carriage stand 93 Weight 94 Frame body 95 Rope 96 Horizontal conveyance machine

Claims (6)

A power storage control device used in an industrial vertical transport machine in which a carrier is connected to one side of a rope hung on a hoist and a weight is connected to the other side,
It is determined whether or not the power storage device has reached a predetermined amount of charge before or when the transfer table is stopped. If the predetermined amount of charge has not been reached, charging is performed and the predetermined amount of charge has been reached. And control to enable the next start on the condition,
The power storage control device for a vertical transport machine, wherein the power storage device is controlled so that the power used by the primary side power source is reduced by discharging the power storage device when the transport platform starts.   2. The power storage control device for a vertical transfer machine according to claim 1, wherein the power used by the primary power supply is controlled so as not to reach a maximum value when the transfer platform starts. 3.   The power storage control device for a vertical transfer machine according to claim 1 or 2, wherein a discharge time of the power storage device is 3 to 10 seconds.   The power storage control device for a vertical transport machine according to any one of claims 1 to 3, wherein the power storage device is discharged only when the transport platform starts.   The power storage control device for a vertical transport device according to any one of claims 1 to 4, wherein when the vertical transport device performs a regenerative operation, the power storage device is controlled to be charged with regenerative power.   The power storage control device for a vertical transfer machine according to any one of claims 1 to 5, wherein the power storage device is an electric double layer capacitor.

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