JP2023160341A - Power supply unit and injection molding machine system with power supply unit, and method and program for supplying drive power to injection molding machine - Google Patents

Abstract

To reduce losses during battery charging in power supply units with batteries, used in injection molding machines.SOLUTION: The power supply unit 200 supplies drive power to the injection molding machine 100 by using power from the external power sources 20, 30. The power supply unit 200 has a battery 220, a charging device 210, and a control unit 250 for controlling the charging device 210. The charging device 210 is configured to convert power from the external power source 20 and supply it to the injection molding machine 100, as well as to charge the battery 220. The control unit 250 sets the output power of the charging device 220 based on the average power consumption in the injection molding machine 100.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a power supply device, an injection molding machine system equipped with the same, and a method and program for supplying driving power to an injection molding machine, and more particularly, to power control in a power supply device for an injection molding machine having a battery. Regarding.

JP 2018-008397 A (Patent Document 1) and JP 2017-217836 A (Patent Document 2) disclose a configuration in which a power storage device (battery) is provided in a power supply line to a servo amplifier of an injection molding machine. is disclosed.

JP2018-008397A JP2017-217836A

In an injection molding machine equipped with a battery as described above, DC power obtained by converting AC power from an external power source (for example, a commercial power source) is used as drive power for driving the injection molding machine, and It is used as charging power to charge the battery.

Generally, it is often desired to charge a battery in a short time. However, when charging a battery while driving an injection molding machine, increasing the charging power to complete charging in a short time increases the power (current) required for the entire device, which increases power consumption. However, as a result, the efficiency of the entire device may be reduced.

The present disclosure has been made to solve such problems, and the purpose is to reduce loss during battery charging in a power supply device equipped with a battery used in an injection molding machine. be.

In the power supply device for an injection molding machine according to the present disclosure, the output power of the charging device that drives the injection molding machine and charges the battery is set based on the average power consumption of the injection molding machine.

According to the power supply device of the present disclosure, it is possible to reduce loss during battery charging in a power supply device equipped with a battery and used in an injection molding machine.

1 is an overall schematic diagram of an injection molding machine system in which a power supply device according to a first embodiment is used. 2 is a diagram for explaining the configuration of the injection molding machine in FIG. 1. FIG. FIG. 3 is a diagram for explaining details of a power supply device. 5 is a time chart for explaining control of the power supply device in Embodiment 1. FIG. 3 is a flowchart for explaining details of processing executed by the control device. 7 is a flowchart for explaining details of processing in Modification 1. FIG. 7 is a flowchart for explaining details of processing in Modification 2. FIG. 7 is a time chart for explaining control of the power supply device in Embodiment 2. FIG. 3 is a flowchart for explaining details of processing executed by the control device.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. In addition, the same reference numerals are attached to the same or corresponding parts in the drawings, and the description thereof will not be repeated.

[Embodiment 1]
<Injection molding machine system configuration>
FIG. 1 is an overall schematic diagram of an injection molding machine system 10 in which a power supply device 200 according to the first embodiment is used. Referring to FIG. 1, an injection molding machine system 10 includes an injection molding machine 100 and a power supply device 200 for supplying power to the injection molding machine 100.

Power supply device 200 includes a battery 220. The battery 220 is charged by a portion of the power received from an external power source such as the commercial power source 20, for example. Power supply device 200 outputs power received from an external power source and/or power stored in battery 220 to injection molding machine 100 . In the injection molding machine 100, devices such as a heater and a servo motor (see FIG. 2) are driven using electric power supplied from a power supply device 200.

Further, as an external power source, a natural energy power generation device 30 may be used instead of or in addition to the commercial power source 20. In the example of FIG. 1, natural energy power generation device 30 includes a wind power generation device 31, a solar power generation device 32, and a power conditioner 35. The power conditioner 35 adjusts the power generated by the wind power generation device 31 and/or the solar power generation device 32 and supplies it to the power supply device 200. Note that the natural energy power generation device 30 may include power generation devices other than the above-mentioned wind power generation device 31 and solar power generation device 32 as long as they generate power using natural energy. For example, the natural energy power generation device 30 may include a hydroelectric power generation device, a geothermal power generation device, a tidal power generation device, or the like.

<Configuration of injection molding machine>
FIG. 2 is a diagram for explaining the configuration of the injection molding machine 100 in FIG. 1. As shown in FIG. For convenience of explanation, the floor surface on which the injection molding machine 100 is arranged in FIG. 2 is assumed to be the XY plane, and the direction perpendicular to the floor surface is assumed to be the Z-axis direction. The positive direction of the Z-axis is sometimes referred to as the upper side or upper side, and the negative direction is sometimes referred to as the lower side or lower side. Although the injection molding machine 100 in the first embodiment is shown as a horizontal injection molding machine, it is not limited to the horizontal type, and may be a vertical injection molding machine.

The injection molding machine 100 includes a mold clamping device 110 for clamping a mold, an injection device 120 for melting and injecting injection material, an operation panel 130, and a control device 140. In FIG. 2, the mold clamping device 110 is arranged on the negative side of the X-axis with respect to the injection device 120.

The mold clamping device 110 includes a bed 111, a fixed platen 112, a mold clamping housing 113, a movable platen 114, a tie bar 115, a mold clamping mechanism 116, molds 117 and 118, and a ball screw 119. The bed 111 is arranged on the floor, and equipment such as a fixed platen 112, a mold clamping housing 113, a movable platen 114, etc. are mounted on the upper surface of the bed 111.

The fixed platen 112 is fixed to the end of the bed 111 on the side closer to the injection device 120 (that is, in the positive direction of the X-axis). The mold clamping housing 113 is arranged at the end of the bed 111 in the negative direction of the X-axis. The fixed platen 112 and the mold clamping housing 113 are connected by a tie bar 115 including a plurality of bars. The mold clamping housing 113 is movable on the bed 111 in the X-axis direction.

The movable platen 114 is arranged on the bed 111 between the fixed platen 112 and the mold clamping housing 113. The movable platen 114 is configured to be movable in the X-axis direction. The mold clamping housing 113 and the movable platen 114 are connected by a mold clamping mechanism 116. The mold clamping mechanism 116 has a toggle mechanism. A ball screw 119 is connected to the toggle mechanism, and by driving a servo motor 151 disposed in the mold clamping housing 113 to rotate the ball screw 119, the movable platen 114 is moved relative to the mold clamping housing 113. It can be relatively moved in the X-axis direction. Note that a direct-acting cylinder driven by hydraulic pressure may be used as the mold clamping mechanism 116.

Molds 117 and 118 are arranged on the movable platen 114 and the fixed platen 112, respectively. The mold 117 and the mold 118 are arranged opposite to each other between the movable platen 114 and the fixed platen 112. By moving the mold 117 in the X-axis direction using the mold clamping mechanism 116, the molds 117 and 118 can be brought into close contact with each other, or the mold 117 can be separated from the mold 118. In the following description, the process of moving the molds 117 and 118 from a state where they are separated to a state where they are in close contact with each other will be referred to as "mold clamping." Further, the process of moving the molds 117 and 118 from a state in which they are in close contact to a state in which they are separated from each other is referred to as "mold opening."

With the molds 117 and 118 in close contact with each other in the mold clamping process, a molten material (resin) is filled inside the mold and cooled to solidify, thereby molding a product into a desired shape. can. After molding the product, with the mold 117 separated from the mold 118 during the mold opening process, a protrusion mechanism (not shown) disposed on the movable platen 114 is operated to remove the molded product from the mold. It can be taken out from 117. The ejection mechanism is driven by a servo motor 152 located on the movable platen 114. Note that the process of taking out the product using the ejecting mechanism is referred to as the "ejecting" process.

Injection device 120 includes a base 121, a heating cylinder 122, a drive device 124, a hopper 125, a nozzle touch device 127, and a temperature sensor 128. The base 121 is arranged on the floor surface of the bed 111 on the positive side of the X-axis, and the drive device 124 is mounted on the upper surface thereof. Servo motors 153 and 154 are arranged in the drive device 124.

A heating cylinder 122 extending in the X-axis direction is arranged in the drive device 124. The heating cylinder 122 includes a heater (not shown) for heating the inside, a screw 123, and an injection nozzle 126. The screw 123 is driven by a servo motor 153 in the drive device 124, and is configured to be rotatable about the X-axis direction as a rotation axis. Further, the screw 123 is driven by a servo motor 154 and is configured to be movable in the X-axis direction. The injection nozzle 126 is arranged at the end of the heating cylinder 122 on the mold clamping device 110 side (that is, the end in the negative direction of the X-axis). The heating cylinder 122 heats and melts the bead-shaped resin material introduced from the hopper 125 and kneads it using the screw 123 to generate a molten material. The process of melting the resin material in this way is called a "plasticization" process.

The nozzle touch device 127 is configured by, for example, a mechanism using a hydraulic cylinder or a mechanism using a ball screw, and connects the drive device 124 and the fixed platen 112 of the mold clamping device 110. When the nozzle touch device 127 is configured by a mechanism using a ball screw, the nozzle touch device 127 is driven by the drive device 124 and moves the drive device 124 and the heating cylinder 122 in the X-axis direction. The injection nozzle 126 is brought into contact with the sprue bush of the mold 118 in the mold clamping device 110 by the nozzle touch device 127, and the molten material is injected from the injection nozzle 126, thereby filling the cavities of the molds 117 and 118 with the molten material. be done. The servo motor 154 applies pressure to the molten material by moving the screw 123 in the heating cylinder 122 in the negative direction of the Maintain constant material pressure.

Note that the configuration of the nozzle touch mechanism is not limited to the configuration in which the entire injection device is moved by a ball screw disposed between the fixed platen 112 and the drive device 124 as described above, and other configurations are also possible. good. For example, the apparatus frame and the fixing member at the rear of the heating cylinder may be connected using a ball screw, and the heating cylinder itself may be moved toward the mold. Alternatively, the slide base on which the injection device is mounted and the device frame may be connected using a ball screw, and the injection device may be moved together with the slide base to bring the injection nozzle into contact with the mold.

Note that the process of injecting the molten material into the molds 117 and 118 is referred to as an "injection" process. Further, after the injection process, the process of cooling the molten material filled in the molds 117 and 118 by maintaining it at a constant pressure is referred to as a "holding pressure" process.

Temperature sensor 128 is located near injection nozzle 126 in heating cylinder 122 . Temperature sensor 128 detects the temperature of the molten material inside heating cylinder 122 and outputs it to control device 140 . The control device 140 controls the heater based on the detected value of the temperature sensor 128 to adjust the temperature of the molten material to a desired temperature.

When the holding pressure step is completed, a mold opening step and an ejection step are performed to take out the molded product.

The injection molding machine 100 can continuously form products by cyclically repeating a mold clamping process, an injection process, a pressure holding process, a plasticizing process, a mold opening process, and an ejection process.

The control device 140 is housed inside the base 121. Control device 140 includes a CPU (Central Processing Unit), a memory 142, and a servo amplifier 143 for driving servo motors 151 to 154. The control device 140 acquires detection values of various sensors arranged in the injection molding machine 100 and controls the injection molding machine 100 in an integrated manner.

The operation panel 130 is a device for an operator to operate the injection molding machine 100, and includes a display device such as a liquid crystal display and an input device such as a keyboard. The operation panel 130 is connected to the control device 140 and can acquire and display the status of the injection molding machine 100 and can output user operation signals from the input device to the control device 140. The operation panel 130 may be a touch panel in which a display device and an input device are integrated. Furthermore, the operation panel 130 may be attached to the bed 111 or the base 121 of the injection molding machine 100, or may be arranged at a position independent of the injection molding machine 100.

<Detailed configuration of power supply>
Next, details of the power supply device 200 in FIG. 1 will be explained using FIG. 3. Referring to FIG. 3, power supply device 200 includes a charging device 210, a battery 220, a DC/DC converter 230, an inverter 240, and a control device 250. Further, the control device 250 includes a CPU 251 and a memory 252.

The charging device 210 is an AC/DC converter, and converts AC power supplied from the commercial power source 20 and/or the natural energy power generation device 30, which are external power sources, into DC power. The DC power converted by the charging device 210 is used as charging power for charging the battery 220 and/or driving power for driving the injection molding machine 100.

The battery 220 is a rechargeable secondary battery such as a lithium ion battery or a lead acid battery. Battery 220 is charged using DC power supplied from charging device 210. Further, the power stored in the battery 220 is used as driving power for the injection molding machine 100.

DC/DC converter 230 converts the voltage of DC power from charging device 210 and/or battery 220 into a predetermined voltage, and supplies the voltage to injection molding machine 100 . Direct current (DC) power converted by DC/DC converter 230 is used, for example, as driving power for servo motors 151 to 154 in injection molding machine 100.

Inverter 240 is a DC/AC converter that converts DC power from charging device 210 and/or battery 220 into AC power and supplies it to injection molding machine 100 . The alternating current (AC) power converted by the inverter 240 is used, for example, as driving power for a heater in the injection molding machine 100 and/or as a control power source.

The control device 250 receives signals from internal devices of the power supply device 200 and external devices of the power supply device 200, and collectively controls each device of the power supply device 200. More specifically, the control device 250 uses a signal indicating the state of charge (SOC) of the battery 220, a signal indicating the predicted power generation amount from the natural energy power generation device 30, and an average power consumption of the injection molding machine 100. , a signal indicating the factory power consumption and power demand in the factory where the injection molding machine 100 is located, and a signal indicating the ambient temperature of the injection molding machine 100 . Based on these signals, control device 250 generates control signal CON1 for charging device 210, control signal CON2 for DC/DC converter 230, and control signal CON3 for inverter 240, and outputs them to the corresponding devices.

In this way, by using the power from the power supply device including the battery as driving power for the injection molding machine, the influence of fluctuations in power from the external power source can be reduced. For example, even if the power supply from the external power supply is interrupted due to a disaster or the like (that is, in the case of a power outage), the injection molding machine can be continuously driven for a certain period of time using the power from the battery. Furthermore, since the power generated by the natural energy power generation device tends to fluctuate depending on the season, climate, and time, by using a battery, it is possible to absorb fluctuations in the amount of power generated by the natural energy power generation device.

<Explanation of processing in the charging device>
Next, the processing of charging device 210 in the first embodiment will be described using FIGS. 4 and 5. In addition, in the description of the processing in the charging device below, FIG. 3 will also be referred to as appropriate. FIG. 4 is a time chart for explaining control of power supply device 200 in the first embodiment. In FIG. 4, the horizontal axis shows time, and the vertical axis shows the SOC of the battery 220 (upper row), the output power of the charging device 210 (middle row), and the power loss in the charging device 210 (lower row). has been done. In addition, in FIG. 4, solid lines LN10, LN20, and LN30 indicate each index in the case of the first embodiment, and broken lines LN11, LN21, and LN31 indicate each index in the case of the comparative example.

Referring to FIG. 4, the operation in the comparative example will first be described. It is assumed that when the injection molding machine 100 is started at time t1, the SOC of the battery 220 is S0, which is lower than the fully charged state. In the comparative example, when the injection molding machine 100 is started, charging of the battery 220 is started while the injection molding machine 100 is operating so that the battery 220 is fully charged in as short a time as possible. That is, the battery 220 is charged with the power of the allowable charging power Wmax. Therefore, until time t2 when the SOC becomes S1, the charging device 210 outputs power P1, which is the sum of the allowable charging power Wmax and the average power consumption Pav of the injection molding machine 100.

When the SOC of the battery 220 reaches S1, which is slightly lower than the fully charged state S2, the control device 250 gradually reduces the charging power of the battery 220 and performs constant voltage charging to prevent overcharging. (broken line LN21). As a result, during a period T2 from time t2 when the battery reaches S1 to time t3 when the battery reaches the fully charged state (S2), charging is performed slowly as indicated by the broken line LN11. When the battery 220 becomes fully charged, the charging operation of the battery 220 ends, and thereafter, during the period T3 until the time t4 when the injection molding machine 100 is stopped, the charging device 210 does not charge the injection molding machine 100. Power equivalent to the average power consumption Pav is output.

In the case of the charging process according to the comparative example, the battery 220 can be fully charged in a short time. However, during the period T1 (time t1 to t2) in which the battery 220 is charged with high power, the power (i.e., current) output from the charging device 210 increases, so the power consumption of the charging device 210, that is, the power loss increases. (broken line LN31). This may result in a decrease in the energy efficiency of the entire system.

In the power supply device 200 according to the first embodiment, a method is adopted in which the battery 220 is charged more slowly than in the comparative example, and the battery 220 is charged over time using power smaller than the allowable charging power Wmax. By using such a charging method, the time required to reach a fully charged state is extended, but the charging power (current) during the charging period can be reduced, and power loss can be reduced.

More specifically, the output power of the charging device 210 is set to a command value Pset that is larger by ΔP1 than the average power consumption Pav of the injection molding machine 100 (solid line LN20). Here, ΔP1 is a power value smaller than the allowable charging power Wmax. By driving the charging device 210 so that the command value Pset is achieved, the battery 220 is charged with surplus power exceeding the power used by the injection molding machine 100 among the power output from the charging device 210. . Thereafter, when the SOC of the battery 220 reaches S1, the value of ΔP1 is gradually lowered to continue charging to prevent overcharging. Then, when the SOC of the battery 220 reaches S2 indicating full charge, the value of ΔP1 is set to zero. Note that it is preferable to set ΔP1 so that the battery 220 is exactly fully charged at the stop time t4 of the injection molding machine 100. By doing so, the charging power during the charging period can be made as small as possible. Therefore, power loss can be further reduced.

FIG. 5 is a flowchart for explaining details of the processing executed by the control device 250. 5 and the flowcharts in FIGS. 6, 7, and 9, which will be described later, are called from the main routine and executed by the CPU 251 in the control device 250 when a predetermined start condition is satisfied.

Referring to FIG. 5, when injection molding machine 100 is started, control device 250 acquires information on average power consumption Pav from injection molding machine 100 in step (hereinafter, step is abbreviated as S) 100. . The average power consumption Pav is the time average value of the power consumed by the injection molding machine 100 during the usage period of the injection molding machine 100 (period T1+T2+T3 in FIG. 4). As described above, the injection molding machine 100 is operated by repeatedly performing a plurality of processes cyclically, so although there are fluctuations in power consumption in each process, the average power consumption over a certain period of time is almost constant. . The control device 250 may obtain the average power consumption Pav calculated by the injection molding machine 100, or may monitor the power output from the power supply device 200 and calculate it by the control device 250 itself. .

Next, control device 250 sets a command value Pset of output power of charging device 210 in S110. Specifically, control device 250 sets power larger by ΔP1 than average power consumption Pav acquired in S100 as command value Pset. In the example of FIG. 5, ΔP1 is a predetermined fixed value. The control device 250 drives the charging device 210 according to the set command value Pset, supplies driving power to the injection molding machine 100, and charges the battery 220. As a result, charging of the battery 220 is started, and the SOC gradually increases. Note that when the load on the injection molding machine 100 momentarily becomes larger than the command value Pset, the insufficient power is supplied from the battery 220.

As charging of the battery 220 progresses, the control device 250 determines in S120 whether the SOC of the battery 220 has reached S1. If the SOC has not reached S1 (NO in S120), the process returns to S120, and charging of the battery 220 continues until the SOC reaches S1.

On the other hand, if the SOC has reached S1 (YES in S120), the process proceeds to S130, and control device 250 gradually reduces additional power ΔP1 to reduce the charging power of battery 220. This slows down the charging of the battery 220 and suppresses overcharging.

Then, in S140, control device 250 determines whether the SOC of battery 220 has reached S2 indicating full charge. If the SOC has not reached S2 (NO in S140), the process returns to S130, and the control device 250 continues charging the battery 220 while lowering the charging power until the SOC reaches S2. and execute it.

On the other hand, if the SOC has reached S2 (YES in S140), the process proceeds to S150, where the control device 250 sets ΔP1 to zero, sets the command value Pset to the average power consumption Pav, and controls the battery 220. Stop charging.

Note that after charging is stopped in S150, the power consumption of the injection molding machine 100 may temporarily increase or decrease compared to the average power consumption Pav, but excess or insufficient power may be charged to the battery 220 or depleted from the battery 220. This is covered by electrical discharge. Therefore, the threshold value S2 indicating full charge is set to a value smaller than the physical maximum charge amount of the battery 220 to the extent that the above fluctuation can be absorbed.

By controlling the output power of the charging device according to the process described above, it is possible to reduce the loss during charging of the battery included in the power supply device. This makes it possible to drive the injection molding machine and charge the battery while suppressing power loss in the entire system.

Note that "power ΔP1" in Embodiment 1 corresponds to an example of "first amount of power" in the present disclosure.

(Modification 1)
In modification 1, a configuration will be described in which the additional power ΔP1 in the output power of the charging device 210 is set based on the charging completion time.

FIG. 6 is a flowchart for explaining details of the process executed by the control device 250 in the first modification. In FIG. 6, step S105 is added to the flowchart in FIG. 5. Note that in the flowchart of FIG. 6, explanations of steps that overlap with those of FIG. 5 will not be repeated.

Referring to FIG. 6, S105 is a step of setting additional power ΔP1 in the output power of charging device 210, and includes S1051 to S1053. After acquiring the average power consumption Pav of the injection molding machine 100 in S100, the control device 250 sets the charging completion time of the battery 220 in S1051. The charging completion time may be set by the user each time, or may be stored in the memory 252 in advance. For example, when the operation time of the injection molding machine 100 is specified, the charging completion time may be set to the operation end time. Further, when the injection molding machine 100 is operated continuously for 24 hours, the time may be set at the end of the late-night electricity period when the electricity rate is low.

Next, control device 250 obtains the current SOC of battery 220 in S1052. Then, in S1053, control device 250 calculates a charging schedule such that charging is completed exactly at the charging completion time, and sets additional power ΔP1 from the schedule. After that, in S110, a command value Pset of the output power of the charging device 210 is set. The subsequent processing is similar to that shown in FIG.

As described above, by setting the additional power ΔP1 based on the charging completion time and the SOC of the battery, charging is continued until the charging completion time, so ΔP1 is set as small as possible. be able to. Thereby, power loss in the charging device during battery charging can be further reduced.

(Modification 2)
In modification 2, a configuration will be described in which when the power supplied from the external power source is expected to fluctuate while charging the battery 220, the additional power ΔP1 is appropriately corrected depending on the situation.

FIG. 7 is a flowchart for explaining details of the process executed by the control device 250 in the second modification. In FIG. 7, S115 is added to the flowchart in FIG. 5. Note that in the flowchart of FIG. 7, descriptions of steps that overlap with those of FIG. 5 will not be repeated.

Referring to FIG. 7, control device 250 sets a command value Pset for the output power of charging device 210 in S110. In S110, the additional power ΔP1 when setting the command value Pset is a fixed value set in advance. Then, in S115, control device 250 corrects the value of power ΔP1 according to the state of the fluctuation factor of power supplied from the external power source, and drives charging device 210.

Here, examples of power fluctuation factors include the ambient temperature in the environment where the injection molding machine 100 is placed, the power demand value in the power system to which the power supply device 200 is connected, and/or the power demand value in the environment where the injection molding machine 100 is placed. One example is the amount of electricity used within the factory. Moreover, when using the electric power from the natural energy power generation device 30 as an external power source, the predicted power generation amount in the natural energy power generation device 30 can also be used.

For example, during the day in midsummer or at night in midwinter, power consumption generally increases for cooling or heating, and there is a risk that the power demand will become tight. In such a case, when considering the efficiency of the entire power system, it is desirable to reduce the power used to charge the battery 220 as much as possible. Therefore, if the surrounding environment temperature is high or low beyond the predetermined range, or if it is likely to exceed the power demand value in the contract with the power supply source (power company), additional power ΔP1 By making corrections to reduce this, it is possible to improve the efficiency of the entire power system.

Similarly, in the factory where the injection molding machine 100 is located, even if the power consumption of the factory temporarily increases due to the operation of other equipment, by reducing the additional power ΔP1, the entire factory can be It is possible to improve power efficiency.

Since the natural energy power generation device 30 generates power using natural phenomena such as sunlight, wind direction/speed, and tide level fluctuation, the amount of power generation may vary depending on the influence of the season and/or climate. If the battery 220 is actively charged when the amount of power generated by the power generation device is low, it will be necessary to increase the amount of power supplied from the commercial power source 20, which will cause an increase in environmental load and cost. obtain. Therefore, when the predicted power generation amount by the natural energy power generation device 30 is smaller than usual, by reducing the additional power ΔP1, it is possible to suppress the impact on the environment and increase in cost.

Note that even when using the commercial power source 20, if the power that can be supplied from an external power source is limited due to a natural disaster, etc., it is preferable to reduce the additional power ΔP1 based on the information. .

In this way, if the power supplied from the external power source is expected to fluctuate significantly, the additional power ΔP1 used for charging the battery is corrected based on that information, so that the power system and/or Alternatively, it is possible to improve the efficiency of electric power within the factory or reduce the impact on the environment.

In addition, if the driving power of the injection molding machine 100, which is the load of the power supply device 200, exceeds the expected power (greater than a predetermined threshold), the additional power ΔP is temporarily reduced. The command value Pset may be set by increasing the command value Pset.

[Embodiment 2]
In the first embodiment, a case has been described in which the battery of the power supply device is charged while the injection molding machine is operating.

In Embodiment 2, a case will be described in which the electric power stored in the battery is used as part of the driving electric power of the injection molding machine to reduce the electric power received from the external power source. For example, if an injection molding machine is operated 24 hours a day, the battery can be charged while the injection molding machine is operating, as in Embodiment 1, during late night hours when electricity rates are low, and the During daytime hours when charges are high, the total power cost can be reduced by operating the injection molding machine while using the power stored in the battery.

FIG. 8 is a time chart for explaining control of power supply device 200 in the second embodiment. In FIG. 8, as in FIG. 4, the horizontal axis shows time, and the vertical axis shows the SOC of the battery 220 (upper row), the output power of the charging device 210 (middle row), and the power in the charging device 210. Losses (bottom row) are shown.

It is assumed that when the injection molding machine 100 is started at time t11, the SOC of the battery 220 is S12, which indicates a fully charged state. The command value Pset of the output power of the charging device 210 is set to a power smaller than the average power consumption Pav of the injection molding machine 100 by a predetermined amount (solid line LN60). In this case, since the external power supply supplies less power than the driving power of the injection molding machine 100, the insufficient power is supplied by the output power Pout from the battery 220. As a result, the SOC of the battery 220 decreases over time as shown by the solid line LN50.

In this case, compared to the case where all of the driving power for the injection molding machine 100 is supplied from an external power source, the output power of the charging device 210 can be reduced, and as a result, the power loss in the charging device 210 can also be reduced. (solid line LN70). Note that in the lower part of FIG. 8, PL1 indicates the power loss when all of the driving power for the injection molding machine 100 is supplied from an external power source.

In this way, when driving the injection molding machine 100 using the electric power stored in the battery 220, from the viewpoint of reducing loss in the charging device 210, the electric power (current) supplied from the charging device 210 should be used as much as possible. It is important to keep it low. Therefore, when the operation end time of the injection molding machine 100 is set, it is preferable to set the output power Pout of the battery 220 so that the charging power of the battery 220 is used up at the operation end time.

In the example of FIG. 8, time t12 indicates the end time of operation of the injection molding machine 100, and at the time t12, the output power Pout of the battery 220 is changed so that the SOC of the battery 220 becomes S11 indicating the minimum charge amount. is set (solid line LN50). By setting the output power Pout in this way, the power supplied from the charging device 210 can be kept as low as possible, so power loss in the charging device 210 can be reduced.

Note that the period during which the injection molding machine 100 is driven using the electric power from the battery 220 is not necessarily limited to the period from the start time of the operation of the injection molding machine 100 to the time the operation end time. May be applied to the period. Further, the period of actively charging the battery 220 as in the first embodiment and the period of actively discharging the battery 220 as in the second embodiment are not limited to consecutively and alternately. Instead, a period may be provided between the charging period and the discharging period in which the injection molding machine 100 is driven mainly using only electric power from an external power source.

FIG. 9 is a flowchart for explaining details of the processing executed by the control device 250. Referring to FIG. 9, when injection molding machine 100 is started, control device 250 acquires the average power consumption Pav of injection molding machine 100 in S200, and acquires the current SOC of battery 220 in S210.

Control device 250 sets a target end time in S220. The target end time is the time when the SOC of the battery 220 reaches S11 indicating the minimum charge amount, and in the example of FIG. 8, corresponds to the operation end time t12 of the injection molding machine 100. The target end time may be set by the user each time, or may be stored in the memory 252 in advance.

Then, in S230, control device 250 sets output power Pout from battery 220 based on time T11 until the target end time and the amount of decrease in SOC (S12-S11). Thereafter, in S240, the control device 250 sets a command value Pset of the output power from the charging device 210 based on the average power consumption Pav of the injection molding machine 100 and the output power Pout of the battery 220 (Pset=Pav -Pout), the injection molding machine 100 is operated.

In S250, control device 250 determines whether the target end time set in S220 has arrived. If the target end time has not arrived (NO in S250), the process returns to S250, and control device 250 operates injection molding machine 100 while continuing to discharge battery 220. On the other hand, if the target end time has arrived (YES in S250), the process proceeds to S260, and control device 250 stops discharging from battery 220.

Here, if the target end time is the end time of operation of the injection molding machine 100, the control device 250 stops the power supply to the injection molding machine 100 at this point. In addition, when continuing operation of the injection molding machine 100 after the target end time, the control device 250 sets the command value Pset of the output power of the charging device 210 to the average power consumption Pav of the injection molding machine 100 in S260. (Pset=Pav), and the injection molding machine 100 continues to be driven using power from the external power source.

By performing control according to the process described above, it is possible to effectively utilize the power stored in the battery, reduce the power from the external power source, and reduce power loss in the charging device.

“Output power Pout” from battery 220 in the second embodiment corresponds to an example of “second amount of power” in the present disclosure.

[Mode]
It will be appreciated by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

(Section 1)
A power supply device according to one embodiment relates to a power supply device for supplying driving power for an injection molding machine using power from an external power source. The power supply device includes a battery, a charging device, and a control device for controlling the charging device. The charging device is configured to convert power from an external power source and supply it to the injection molding machine, as well as to charge the battery. The control device sets the output power of the charging device based on the average power consumption in the injection molding machine.

(Section 2)
In the power supply device according to item 1, the control device sets the output power of the charging device to be more power than the average power consumption by a first amount. The battery is charged using the output power of the charging device that exceeds the driving power.

(Section 3)
In the power supply device according to item 2, the first amount is smaller than the allowable charging power of the battery.

(Section 4)
In the power supply device according to item 2 or 3, the control device sets the first amount according to a period until a preset charging completion time.

(Section 5)
In the power supply device according to item 4, the control device sets the first amount based on the amount of power required until the battery is fully charged and the period until the charging completion time.

(Section 6)
In the power supply device according to any one of items 2 to 5, the control device corrects the first amount according to the ambient temperature in the environment where the injection molding machine is placed.

(Section 7)
In the power supply device according to any one of items 2 to 6, the control device corrects the first amount according to a power demand value in a power system to which the power supply device is connected.

(Section 8)
In the power supply device according to any one of items 2 to 7, the control device corrects the first amount according to the amount of power used in a factory where the injection molding machine is installed.

(Section 9)
In the power supply device according to any one of items 2 to 8, the external power source includes a power generation device using natural energy. The control device corrects the first amount according to the predicted power generation power of the power generation device.

(Section 10)
In the power supply device according to any one of items 2 to 8, the control device increases the first amount when the driving power of the injection molding machine exceeds a threshold value.

(Section 11)
In the power supply device according to item 1, the control device sets power that is less than the average power consumption by a second amount as the output power of the charging device. The battery outputs power that the output power of the charging device is insufficient for driving power.

(Section 12)
In the power supply device according to item 11, the operation end time of the injection molding machine is determined in advance. The control device sets the second amount so that the charging power of the battery becomes a predetermined amount at the operation end time.

(Section 13)
An injection molding machine system according to another aspect includes an injection molding machine and a power supply device for supplying driving power to the injection molding machine using power from an external power source. The power supply device includes a battery, a charging device, and a control device for controlling the charging device. The charging device is capable of converting power from an external power source and supplying it to the injection molding machine, as well as charging the battery. It is composed of The control device sets the output power of the charging device based on the average power consumption in the injection molding machine.

(Section 14)
A method according to another aspect relates to a method of supplying driving power from a power supply device to an injection molding machine using power from an external power source. The power supply device includes a battery and a charging device configured to convert power from an external power source and supply it to the injection molding machine and to charge the battery. The method includes (a) obtaining average power consumption in the injection molding machine; and (b) setting output power of the charging device based on the average power consumption.

(Section 15)
A program according to another aspect relates to a program for causing a control device of a power supply device to execute a process of supplying driving power from the power supply device to an injection molding machine using power from an external power source. The power supply device includes a battery, a charging device, and the control device. The charging device is configured to convert power from an external power source and supply it to the injection molding machine, as well as to charge the battery. The program includes a step of obtaining average power consumption in the injection molding machine, and a step of setting output power of the charging device based on the average power consumption.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive.

10 injection molding machine system, 20 commercial power supply, 30 natural energy power generation device, 31 wind power generation device, 32 solar power generation device, 35 power conditioner, 100 injection molding machine, 110 mold clamping device, 111 bed, 112 fixed platen, 113 mold Clamping housing, 114 Movable platen, 115 Tie bar, 116 Clamping mechanism, 117, 118 Mold, 119 Ball screw, 120 Injection device, 121 Base, 122 Heating cylinder, 123 Screw, 124 Drive device, 125 Hopper, 126 Injection nozzle , 127 nozzle touch device, 128 temperature sensor, 130 operation panel, 140,250 control device, 141,251 CPU, 142,252 memory, 143 servo amplifier, 151 to 154 servo motor, 200 power supply device, 210 charging device, 220 battery , 230 DC/DC converters, 240 inverters.

Claims (15)

A power supply device for supplying driving power for an injection molding machine using power from an external power source,
battery and
a charging device configured to convert power from the external power source and supply it to the injection molding machine, and to charge the battery;
and a control device for controlling the charging device,
The control device is a power supply device that sets output power of the charging device based on average power consumption in the injection molding machine. )
The control device sets the output power of the charging device to be more power by a first amount than the average power consumption,
The power supply device according to claim 1, wherein the battery is charged using power exceeding the drive power out of the output power of the charging device. The power supply device according to claim 2, wherein the first amount is smaller than an allowable charging power of the battery. The power supply device according to claim 2, wherein the control device sets the first amount according to a period until a preset charging completion time. The power supply device according to claim 4, wherein the control device sets the first amount based on the amount of power required until the battery is fully charged and the period until the charging completion time. The power supply device according to any one of claims 2 to 5, wherein the control device corrects the first amount according to an ambient temperature in an environment in which the injection molding machine is placed. The power supply device according to any one of claims 2 to 5, wherein the control device corrects the first amount according to a power demand value in a power supply system to which the power supply device is connected. The injection molding machine is located in a factory,
The power supply device according to any one of claims 2 to 5, wherein the control device corrects the first amount according to the amount of power used by the factory. The external power source includes a power generation device using natural energy,
The power supply device according to any one of claims 2 to 5, wherein the control device corrects the first amount according to the predicted power generation capacity of the power generation device. The power supply device according to claim 2, wherein the control device increases the first amount when the driving power of the injection molding machine exceeds a threshold value. The control device sets the output power of the charging device to a second amount less power than the average power consumption,
The power supply device according to claim 1, wherein the battery outputs power that the output power of the charging device is insufficient for the drive power. The operation end time of the injection molding machine is determined in advance,
The power supply device according to claim 11, wherein the control device sets the second amount so that the amount of charge of the battery becomes a predetermined amount at the operation end time. injection molding machine,
and a power supply device for supplying driving power to the injection molding machine using power from an external power source,
The power supply device includes:
battery and
a charging device configured to convert power from the external power source and supply it to the injection molding machine, and to charge the battery;
a control device for controlling the charging device;
In an injection molding machine system, the control device sets output power of the charging device based on average power consumption in the injection molding machine. A method for providing drive power from a power supply to an injection molding machine using power from an external power source, including the following steps:
The power supply device includes:
battery and
a charging device configured to convert power from the external power source and supply it to the injection molding machine, and to charge the battery;
(a) obtaining average power consumption in the injection molding machine;
(b) Setting the output power of the charging device based on the average power consumption. A program for causing a control device of the power supply device to execute a process of supplying driving power from the power supply device to an injection molding machine using power from an external power source, the program comprising:
The power supply device includes:
battery and
a charging device configured to convert power from the external power source and supply it to the injection molding machine, and to charge the battery;
the control device;
The program is
obtaining average power consumption in the injection molding machine;
and setting output power of the charging device based on the average power consumption.

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