JP6576317B2 - Electric injection molding machine system - Google Patents

Description

  The present invention relates to an electric injection molding machine system including an electric injection molding machine and a power supply device that supplies electric power thereto.

  As is conventionally known, an injection molding machine includes a mold clamping device for clamping a mold, an injection device for melting resin and injecting it into a mold, and the like. The screw is driven in the axial direction and the rotational direction. In an electric injection molding machine, these devices are driven by a motor. The electric injection molding machine includes a converter, and a three-phase AC voltage supplied from a factory is converted into a DC voltage. Each motor is provided with an inverter, and this DC voltage is converted into a three-phase AC voltage of an arbitrary voltage at an arbitrary frequency by the inverter and supplied to the motor to drive the motor.

JP 2013-18152 A

  Patent Document 1 describes an electric injection molding machine including a power storage device. The power storage device is provided on a DC voltage line connecting the converter and the inverter. The power storage device includes a power storage circuit including a coil, a capacitor, two switches, and two diodes. The power storage device boosts the DC voltage from the DC voltage line and stores the boosted voltage in the capacitor or the capacitor. The power is stepped down as necessary and supplied to the DC voltage line. Therefore, power can be stored in the power storage device in a process that consumes relatively little power in the molding cycle, power can be supplied in a process that requires high power, and power consumption can be smoothed throughout the molding cycle. The electric injection molding machine described in this document can also stop the electric injection molding machine safely during a power failure. That is, at the time of a power failure, the control device is driven by the power from the power storage device, and each motor is driven for a predetermined time by the power stored in the power storage device. Stop when each device is in a safe state.

  Since the electric injection molding machine described in Patent Document 1 includes a power storage device in the DC voltage line, it stores power when there is a margin in power, and supplies it to the DC voltage line when large power is required, The power consumed for the entire molding cycle can be smoothed. And even during a power failure, it can be operated for a predetermined time, and the electric injection molding machine can be brought to a safe state and stopped. In other words, electric power that can be safely stopped even during a power failure is stored. By the way, although the electric injection molding machine is shipped and used in various countries and regions, there are countries and regions where the power situation is not good. For example, there may be a sudden power outage several times a day, or there may be a power outage for a predetermined time zone planned in advance. In such a case, the electric injection molding machine must be stopped, and the productivity is significantly reduced. If there is an electric injection molding machine that can continue the molding cycle even in the event of a power failure, a decrease in productivity can be avoided. The electric injection molding machine described in Patent Document 1 can store only the power necessary to safely stop the device in the event of a power failure in the power storage device. However, if a large amount of power can be stored, it can be molded even in the event of a power failure. The cycle is likely to continue. For example, power may be stored in a storage battery instead of a capacitor. However, the planned power outage stops the supply of power for a relatively long time. In order to continue the molding cycle even in such a planned power outage, a large storage battery is required. If it does so, the ratio of the electric power storage apparatus to an electric injection molding machine will become large, and an electric injection molding machine will enlarge. It is also a problem when used in countries where power outages are frequent. After the operation of the electric injection molding machine with electric power from the storage battery, charging of the storage battery is started when the power failure is restored, but if the next power failure occurs when the storage amount of the storage battery has not recovered, the electric injection This is because the molding machine cannot continue operation. In other words, productivity cannot be increased sufficiently in countries and regions where power outages occur frequently. The electric injection molding machine equipped with a storage battery also has a problem with maintenance. Although the storage battery deteriorates due to long-term use, the electric injection molding machine must be stopped in order to replace the deteriorated storage battery, and at this time, productivity is lowered.

  An object of the present invention is to provide an electric injection molding machine system that solves the above-described problems, and more specifically, an electric injection molding machine system that includes a storage battery, and is a relatively long-time power failure. It is an object of the present invention to provide an electric injection molding machine system that can continue a molding cycle even when the occurrence of a battery occurs, and can realize high productivity by continuing the molding cycle even during maintenance of a storage battery.

In order to achieve the above object, the present invention is configured as an electric injection molding machine system including a power supply device and an electric injection molding machine. The power supply device and the electric injection molding machine are connected to each other by an external DC voltage line. The power supply device is provided with a storage battery, and only the DC voltage from the storage battery is supplied to this external DC voltage line. The electric injection molding machine is configured to directly supply a DC voltage supplied from an external DC voltage line to an inverter for driving a motor.

Specifically, in order to achieve the above object, the invention according to claim 1 includes an electric injection molding machine and a power supply device connected to each other by an external DC voltage line, and the power supply device includes a storage battery. The DC voltage supplied from the power supply device to the electric injection molding machine via the external DC voltage line consists only of the DC voltage from the storage battery, and the DC voltage is used for driving the motor in the electric injection molding machine. It is configured as an electric injection molding machine system characterized by being supplied to the inverter .
According to a second aspect of the present invention, there is provided an electric injection molding machine system according to the first aspect, wherein the power supply device includes a plurality of switchable storage batteries. Is done.
According to a third aspect of the present invention, in the electric injection molding machine system according to the first or second aspect, a plurality of the power supply devices are provided and are switched and connected to the external DC voltage line via a predetermined selector. The electric injection molding machine system is characterized by being configured as described above.
According to a fourth aspect of the present invention, in the electric injection molding machine system according to the first to third aspects, the electric injection molding machine system includes a host controller, the host controller, the electric injection molding machine, and the power supply device. Is configured as an electric injection molding machine system characterized in that information is transmitted and received between the communication means.

As described above, the present invention includes an electric injection molding machine and a power supply device that are connected to each other by an external DC voltage line, and the power supply device is configured as an electric injection molding machine system that includes a storage battery . The DC voltage supplied from the power supply device to the electric injection molding machine via the external DC voltage line consists only of the DC voltage from the storage battery, and the DC voltage is supplied to the motor drive inverter in the electric injection molding machine. It has come to be . Then, the electric injection molding machine does not require a converter and can be made relatively small. And because the present invention can drive the electric injection molding machine by electric power from the battery, it can be continued the molding cycle at the time of power failure, even in the country or region power situation not good, can be operated stably . And since the electric injection molding machine and the power supply device are independent, even if the amount of power storage is increased and the storage battery is increased in order to increase the number of molding cycles that can be operated, There is no need to increase the size of the injection molding machine. In addition, the storage battery deteriorates when it is repeatedly charged / discharged over a long period of time. However, the storage battery may be replaced in the power supply device, and there is no need to maintain the electric injection molding machine. In other words, if the direct current is supplied by other means, the electric injection molding machine can continue operation. Since the electric injection molding machine system of the present invention can continue the operation of the electric injection molding machine, the productivity is high. According to another invention, the power supply device comprises a plurality of switchable storage batteries. If it does so, when supplying electric power from the charged storage battery, the discharged storage battery can be charged. Further, if there is a deteriorated storage battery among a plurality of storage batteries, only that storage battery can be switched and replaced, and the effect of not stopping the power supply can be obtained. According to still another invention, in the electric injection molding machine system, a plurality of power supply devices are provided and are switched and connected to a DC voltage line via a predetermined selector. Then, if the amount of electricity stored in the predetermined power supply device decreases, the power supply device can be switched to another fully charged power supply device, and the molding cycle can be continued even during a power failure. According to another invention, the electric injection molding machine system includes a host controller, and the host controller, the electric injection molding machine, and the power supply device transmit and receive information to and from each other by communication means. Since it is configured in this manner, information on the electric injection molding machine process, power consumption, and the like, and information on the amount of electricity stored in the power supply device can be sent to the host controller. The host controller can predict the electric power required by the electric injection molding machine and send a command to supply the electric power supply apparatus with the necessary electric power. In addition, when there are a plurality of power supply devices, a command can be sent to switch to another power supply device if the power storage amount required for the predetermined power supply device is not secured. Since the host controller can appropriately operate the electric injection molding machine and the power supply device, the efficiency of the electric injection molding machine system can be increased.

1 is a system diagram schematically showing an electric injection molding machine system according to a first embodiment of the present invention. It is a system diagram showing typically an electric injection molding machine system concerning a 2nd embodiment of the present invention. It is a graph which shows the change of the electrical storage amount of each storage battery of the 1st, 2nd electric power supply apparatus in the electric injection molding machine system which concerns on the 2nd Embodiment of this invention. It is a system diagram which shows typically the electric injection molding machine system which concerns on the 3rd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described. An electric injection molding machine system 1 according to a first embodiment described first has the simplest configuration among a plurality of embodiments of the present invention. . Other embodiments described later have an expanded configuration of the first embodiment, which is the basic configuration.

  As shown in FIG. 1, an electric injection molding machine system 1 according to the first embodiment, which is a basic configuration, includes an electric injection molding machine 2 according to the present embodiment and the electric injection molding machine. 2 and a host controller 5 that collects information from them and outputs a predetermined command. Similarly to the conventionally known electric injection molding machine, the electric injection molding machine 2 according to the present embodiment also includes a mold clamping device for clamping a mold, and an injection device that includes a heating cylinder and a screw to melt and inject resin. , And a projecting device for projecting a molded product. These devices are driven by a motor such as a servo motor. However, there is a great difference between a conventional electric injection molding machine and its power supply system. That is, the electric injection molding machine 2 according to the present embodiment does not include a converter. The electric injection molding machine 2 according to the present embodiment is connected to an external DC voltage line 7 via a predetermined terminal portion 9 and connected to an in-device DC voltage line 10 provided inside the electric injection molding machine 2. A DC voltage is supplied. The DC voltage is supplied to inverters that drive motors provided in the respective devices, that is, servo amplifiers 12, 13,. In other words, the DC voltage supplied from the external DC voltage line 7 is directly supplied to the servo amplifiers 12, 13,. The DC voltage line 10 in the apparatus is provided with a smoothing capacitor 17 to suppress fluctuations in the DC voltage.

  The power supply device 3 according to the first embodiment of the present invention includes a storage battery 18 that stores a relatively large amount of power and a DC voltage supply circuit 20. The DC voltage supply circuit 20 is a circuit that boosts a predetermined DC voltage supplied from the storage battery 18, and generates a DC voltage to be supplied to the DC voltage line 7.

  The host controller 5 is connected to each other by the electric injection molding machine 2, the power supply device 3, and the communication line 21. The electric injection molding machine 2 receives process information in the molding cycle, information such as power consumption in the molding cycle, and the power supply device 3 receives information related to the amount of stored electricity. The amount of stored electricity can be obtained, for example, by detecting the voltage of the storage battery 18. In the electric injection molding machine system 1 according to the first embodiment, the electric injection molding machine 2 is operated by receiving electric power supplied from the electric power supply device 3 provided with the storage battery 18. Even so, a molding cycle can be carried out. In addition, stable operation is possible even in countries and regions where power conditions are not good. The host controller 5 receives information about the amount of electricity stored from the power supply device 3, but the amount of electricity stored in the storage battery 18 is reduced, and the power consumption required to perform the molding cycle in the electric injection molding machine 2. Is determined to be difficult to supply, a stop command is sent to the electric injection molding machine 2. The electric injection molding machine system 1 can be stopped safely. The storage battery 18 is charged as necessary. Or it replaces | exchanges the charged storage battery 18, and the driving | operation of the electric injection molding machine system 1 is restarted.

  An electric injection molding machine system 1 'according to a second embodiment of the present invention will be described. Devices and members similar to those of the electric injection molding machine system 1 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 2, the electric injection molding machine system 1 ′ according to the second embodiment includes two power supply devices, that is, first and second power supply devices 3a and 3b. There is a feature in the point. The first and second power supply devices 3 a and 3 b are composed of a storage battery 18 and a DC voltage conversion / supply circuit 24. The DC voltage conversion / supply circuit 24 has two functions. The first function is a function of boosting the DC voltage from the storage battery 18 and generating a DC voltage to be supplied to the DC voltage line 7, and is the same as in the previous embodiment. The second function is a function of charging the storage battery 18. In the second embodiment, the first and second power supply devices 3 a and 3 b are connected to the factory power supply 23, and the three-phase AC voltage supplied from the factory power supply 23 is converted into a DC voltage by the DC voltage conversion / supply circuit 24. Is converted to Thereby, the storage battery 18 is charged. The electric injection molding machine system 1 ′ according to the second embodiment includes a selector 25 in the DC voltage line 7, and switches the connection between the first and second power supply devices 3 a and 3 b and the DC voltage line 7. Be able to. Both the first and second power supply devices 3 a and 3 b and the selector 25 are connected to the host controller 5 by the communication line 21.

  The operation of the electric injection molding machine system 1 'according to the second embodiment will be described. At the start of operation, the storage battery 18 of the first power supply device 3a is in a sufficiently charged state, and the storage battery 18 of the second power supply device 3b is in a discharged state. The host controller 5 receives the information regarding the storage amount from the first and second power supply devices 3a and 3b, and determines that the first power supply device 3a supplies the DC voltage. A command is sent to the selector 25 to connect the first power supply device 3 a to the DC voltage line 7. The host controller 5 sends a command to supply a DC voltage to the first power supply device 3a and sends a command to store power in the second power supply device 3b. The electric injection molding machine 2 starts a molding cycle. When the molding cycle is started, the amount of electricity stored in the first power supply device 3a gradually decreases. On the other hand, since the second power supply device 3b is stored in the storage battery 18, the amount of stored power increases. This is shown in the section 31 of the graph of FIG. When it is detected that the battery 18 is sufficiently charged in the second power supply device 3b, the second power supply device 3b stops the power storage as indicated by reference numeral 41. Even when power storage is stopped in the second power supply device 3b, a sufficient amount of power stored in the first power supply device 3a remains, so the supply of DC voltage from the first power supply device 3a is continued. This is shown in the section 32 of the graph. When the storage amount of the first power supply device 3a reaches a preset lower limit as indicated by reference numeral 42, the host controller 5 transmits a command to each device. That is, the selector 25 switches the connection to the second power supply device 3b so that the first power supply device 3a starts to store electricity, the second power supply device 3b starts to supply DC voltage, and so on. , Each sends a command. The state where the first power supply device 3a starts to store electricity and the amount of stored electricity increases, and the state where the second power storage device 3b supplies DC voltage and the amount of stored electricity gradually decreases, This is shown in the section 33 of the graph. When the power storage is completed, the power storage of the first power supply device 3a is stopped. As shown in the section 34, the DC voltage is continuously supplied from the second power supply device 3b. When the amount of electricity stored in the second power supply device 3b reaches the lower limit value, the host controller 5 transmits a command to each device. That is, the selector 25 switches the connection to the first power supply device 3a so that the first power supply device 3a starts to supply DC voltage, the second power supply device 3b starts to store power, and so on. , Each sends a command. Thereafter, the same operation is performed.

  Also in the second embodiment, since the electric injection molding machine 2 is operated by the power stored in the first and second power supply devices 3a and 3b, the molding cycle can be continued even if a power failure occurs. . And since it accumulates in 1st, 2nd electric power supply apparatus 3a, 3b alternately, the electric injection molding machine 2 does not need to stop. In the graph of FIG. 3, sections 32 and 34 indicate a state in which the other power supply devices 3a and 3b are stopped when a DC voltage is supplied from one of the power supply devices 3a and 3b. . Such sections 32 and 34 can evaluate the stability of the electric injection molding machine system 1 ′ by their lengths. When the sections 32 and 34 are short, it should be considered to increase the capacity of the storage battery 18 or add a third power supply device.

  FIG. 4 shows an electric injection molding machine system 1 ″ according to the third embodiment. Devices and members similar to those of the electric injection molding machine system 1 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the electric injection molding machine system 1 ″ according to the third embodiment, the power supply device 3 ″ includes two storage batteries 18 and 18 and a switch 27 that switches between the storage batteries 18 and 18. ing. The storage batteries 18 and 18 are configured to supply a DC voltage from one selected by the switch 27, and the other not selected can be replaced even during operation. Therefore, when the storage amount of the storage battery 18 supplying the DC voltage reaches the lower limit value, it is considered that the battery has been discharged, and the switch 27 switches to the other storage battery 18 to continue the supply of the DC voltage. Remove and replace with a new charged storage battery 18. The removed storage battery 18 stores electricity elsewhere. In this way, the electric injection molding machine 2 can be continuously operated even in a factory where there is no external power supply.

  The electric injection molding machine systems 1, 1 ′, 1 ″ according to the present embodiment can be variously modified. For example, in the second embodiment, the first and second power supply devices 3a, 3b are provided with only one storage battery 18, 18, but a plurality of storage batteries 18, 18,. May be. Further, as described above, a third power supply device or a fourth power supply device may be added. Other variations are possible. In the electric injection molding machine systems 1, 1 ′, 1 ″ according to the present embodiment, only one electric injection molding machine 2 is connected, but two or more electric injection molding machines 2, 2, ... may be connected.

DESCRIPTION OF SYMBOLS 1 Electric injection molding machine system 2 Electric injection molding machine 3 Electric power supply apparatus 3a, 3b First and second electric power supply apparatuses 5 Host controller 7 DC voltage lines 12, 13, Servo amplifier 17 Smoothing capacitor 18 Storage battery 20 DC voltage supply circuit 21 Communication Line 23 Factory Power Supply 24 DC Voltage Conversion / Supply Circuit 25 Selector 27 Switch

Claims (4)

It consists of an electric injection molding machine and a power supply device connected to each other by an external DC voltage line,
The power supply device includes a storage battery, and the DC voltage supplied from the power supply device to the electric injection molding machine via the external DC voltage line is composed only of the DC voltage from the storage battery, and the DC voltage is An electric injection molding machine system that is supplied to an inverter for driving a motor in the electric injection molding machine.   The electric injection molding machine system according to claim 1, wherein the storage battery includes a plurality of storage batteries and is switchably provided in the power supply device.   3. The electric injection molding machine system according to claim 1, wherein a plurality of the power supply devices are provided, and are switched and connected to the external DC voltage line via a predetermined selector. Electric injection molding machine system.   4. The electric injection molding machine system according to claim 1, wherein the electric injection molding machine system includes a host controller, and the host controller, the electric injection molding machine, and the power supply device transmit and receive information to and from each other by communication means. An electric injection molding machine system characterized by that.

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