JP6377097B2 - Injection molding machine system - Google Patents

Description

  The present invention relates to an injection molding machine system including a plurality of electric injection molding machines.

  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 plurality of servo amplifiers, that is, inverters. Three-phase AC power supplied from a factory is converted into a DC voltage by the converter. A phase alternating voltage is generated and supplied to the motor to drive each device. By the way, the electric injection molding machine requires a large amount of power in a short time in the injection process, although the amount of power required for the molding cycle is relatively small. Therefore, in a factory where an electric injection molding machine is installed, a large-capacity power receiving facility is provided in consideration of the maximum power in the injection process. Also, because the maximum power is large, the contracted electricity bill must be high.

JP 2008-87938 A JP 2013-154475 A JP 2013-18152 A

  Patent Document 1 proposes an electric injection molding machine in which electric power consumed through a molding cycle is smoothed. In this electric injection molding machine, a power storage device is provided on a DC voltage line on the output side of the converter. When the power storage device is a process with low power consumption by an inverter, for example, in a mold opening / closing process, a plasticizing process, etc., the power storage device obtains power from a DC voltage line and stores it. When the process consumes much power, specifically, in the injection process, the stored power is supplied to the DC voltage line as a DC voltage. As described above, since the electric injection molding machine described in Patent Document 1 is provided with the power storage device that can store and supply electric power to the DC voltage line, the electric power supplied to the electric injection molding machine is smoothed to the maximum power. Becomes smaller. Then, the capacity of the power receiving facility in the factory can be reduced, and the contract electricity charge is also reduced.

  By the way, if the factory fails, the electric injection molding machine will inevitably receive power. There is also a danger if the electric injection molding machine stops during the molding cycle. For example, if the electric injection molding machine stops during the operation during mold opening / closing, there is a possibility that the mold platen operates due to inertia to break the mold. Patent Document 2 proposes an electric injection molding machine that can drive an electric injection molding machine for a predetermined time even when a power failure occurs in a factory, thereby making each device safe. ing. As in the electric injection molding machine described in Patent Document 1, the electric injection molding machine described in Patent Document 2 is provided with a power storage device on the DC voltage line on the output side of the converter. As a result, a DC voltage is supplied to the DC voltage line even during a power failure. By the way, the controller that controls each device operates by receiving a control DC voltage from a control power supply in a normal state. In the electric injection molding machine described in Patent Literature 2, when a power failure is detected, the DC voltage supplied by the power storage device is stepped down via the chopper circuit. This is used as a DC voltage for control during a power failure. The controller can operate normally by the stepped down DC voltage for control, and the electric injection molding machine can be controlled for a predetermined time even during a power failure. As a result, the electric injection molding machine can be brought to a safe state and stopped.

  Patent Document 3 proposes an injection molding machine system in which the present invention and the object of the invention are completely different, but the configuration of the invention is somewhat similar. As shown in FIG. 4, an injection molding machine system 50 described in this document includes a power supply device 51 including a converter, and a plurality of electric injection molding machines 52 that receive a DC voltage from the power supply device 51. 52,... In this system 50, the power supply device 51 includes a converter 55 and a power storage device 57. The three-phase AC voltage supplied from the external power supply 53 is converted into a DC voltage by the converter 55, and the DC voltage is stored as power by the power storage device 57. At the same time, the stored electric power is supplied as a DC voltage as required. In this injection molding machine system 50, the electric injection molding machines 52, 52,... Have a smoothing capacitor 59 that stabilizes the DC voltage, but the DC voltage is supplied from the power supply device 51 via the DC voltage line 54. The converter is no longer needed. The electric injection molding machines 52, 52,... Are provided with an inverter and a motor corresponding to each axis such as an injection shaft that drives a screw of the injection device, a plasticizing shaft, and a mold clamping shaft that opens and closes the mold clamping device. Thus, a three-phase AC voltage is generated from the DC voltage to drive each device. By the way, according to this document, in a general electric injection molding machine, a power storage device is provided for each electric injection molding machine, and electric power regenerated from each device is charged. In this injection molding machine system 50, only one power storage device 57 for storing and supplying regenerative power needs to be provided on the power supply device 51 side, and no power storage device is required for each of the electric injection molding machines 52, 52,. . Therefore, the cost is reduced as a whole.

  Patent Document 3 proposes another injection molding machine system 50 '. As shown in FIG. 5, the injection molding machine system 50 ′ is also composed of one power supply device 51 ′ and a plurality of electric injection molding machines 52 ′, 52 ′,. The electric power is supplied from the power supply device 51 ′ to each electric injection molding machine 52 ′, 52 ′,... Not by a DC voltage but by an AC voltage composed of a rectangular wave. Specifically, the power supply device 51 ′ is provided with a DC / rectangular wave converter 61, and the DC voltage converted by the converter 55 is converted into an AC voltage made up of a rectangular wave. A rectangular wave AC voltage is supplied to each electric injection molding machine 52 ′, 52 ′,... Via a rectangular wave voltage line 62, and each electric injection molding machine 52 ′, 52 ′,. A converter 63 is provided to convert a rectangular AC voltage into a DC voltage. In the injection molding machine system 50 ′, similarly to the injection molding machine system 50 shown in FIG. 4, it is not necessary to provide the converter 55 and the power storage device 57 for each of the electric injection molding machines 52 ′, 52 ′,. The system can be provided at a low cost as a whole.

  Since the electric injection molding machine described in Patent Document 1 is provided with a power storage device, the power consumed is smoothed, and the maximum power of the three-phase AC voltage required from the factory can be small. Therefore, the burden on the power receiving equipment in the factory is small, and the electricity charge is also small and excellent. In addition, the electric injection molding machine described in Patent Document 2 can reduce the maximum power in the same manner as the electric injection molding machine described in Patent Document 1, and furthermore, since a DC voltage for control is ensured even during a power failure, the electric injection molding machine is electrically operated. The injection molding machine can be put in a safe state and is excellent. However, there are problems. Specifically, when there are a plurality of electric injection molding machines, it is necessary to provide a power storage device in all the electric injection molding machines, so that there is a problem that costs increase. In addition, there is a problem that the drive time during a power failure is short. In view of the object of the invention of Patent Document 2, the capacity of the power storage device is such that it stores power necessary for stopping the electric injection molding machine in a safe state during a power failure. Driving for a long time is not considered. If a large power storage device is provided so that a large amount of power is stored, the electric injection molding machine can be operated for a long time even during a power failure. However, if a large-sized power storage device is provided, the electric injection molding machine becomes large and expensive.

  In the injection molding systems 50 and 50 ′ described in Patent Document 3, the purpose of the power storage device 57 is to store regenerative power and supply it appropriately. In other words, it is not intended to smooth the power in the molding cycle of the electric injection molding machines 52, 52 ′, but to supply power so that the electric injection molding machines 52, 52 ′ can be driven during a power failure. Not a thing. However, if the capacity of the power storage device 57 is increased to some extent, the variation in power consumption in the molding cycle of each electric injection molding machine 52, 52 ′ can be alleviated and supplied from the external power supply 53 to the power supply device 51. It seems possible to smooth the power. It is also possible to supply power to the electric injection molding machines 52, 52 ',. However, there are also problems with such injection molding machine systems 50, 50 '. Specifically, the problem that the DC voltage becomes unstable can be pointed out. First, the injection molding machine system 50 will be described as an example. The electric injection molding machine 52 consumes a large amount of power in the injection process as described above. Although the time required for the injection process is very small in the entire molding cycle, a large amount of electric power is consumed, so that the DC voltage drops instantaneously. Since the electric injection molding machine 52 is provided with the smoothing capacitor 59, the decrease in the DC voltage of the DC voltage line 54 is slightly mitigated. However, the drop in DC voltage affects the operation of the other electric injection molding machine 52. If the injection process is performed simultaneously in a plurality of electric injection molding machines 52, 52,..., An instantaneous drop in the DC voltage cannot be ignored, and the control of other electric injection molding machines 52 is adversely affected. End up. There is a similar problem in the injection molding machine system 50 '. The influence of the decrease in the DC voltage in the injection process appears as a decrease in the rectangular wave AC voltage in the rectangular wave voltage line 62. If the injection process is simultaneously performed in a plurality of electric injection molding machines 52 ′, 52 ′,..., The voltage drop is increased, and the operation of the other electric injection molding machines 52 ′ is hindered. .

  An object of the present invention is to provide an injection molding machine system that solves the above-described problems. Specifically, the power supplied from a factory is smoothed, thereby burdening the power receiving equipment of the factory. To provide an injection molding machine system that is low in electricity cost, that can operate an electric injection molding machine for a predetermined time in the event of a power failure, and that all the electric injection molding machines belonging to the system can stably obtain the necessary power. It is an object.

The present invention, in order to achieve the above object, Ri Do from a power supply device for supplying power, a plurality of electric injection molding machine which is driven by power supply from said power supply device, these transmission The injection molding machine system is connected to each other by a voltage line for operation. The power supply device includes an AC / DC conversion circuit and a power storage device. The three-phase AC voltage supplied from the factory is converted into a DC voltage by an AC / DC conversion circuit, and power is stored in the power storage device and supplied as a DC voltage as necessary. The power supplied from such a power supply device to the electric injection molding machine via the transmission voltage line is transmitted as a transmission DC voltage for power transmission . The electric injection molding machine includes a DC voltage step-up / step-down circuit, and the transmission DC voltage supplied from the power supply device is boosted to a driving DC voltage by the DC voltage step-up / down circuit. This driving DC voltage is supplied to the inverter in the electric injection molding machine.

That is, in order to achieve the above object, the invention according to claim 1 is a power supply device that supplies power, and a plurality of electric injection molding machines that are driven by the supply of power from the power supply device. Tona is, they are an injection molding machine systems that are interconnected by transmission voltage line, said power supply device, AC-DC conversion circuit for converting the three-phase AC voltage supplied from the factory into a DC voltage If, on the necessary and a power storage device for supplying a DC voltage, electrical power output to the transmission voltage line from said power supply device is a DC voltage for the transmission transmission DC voltage is thereby stores power is, the electric injection molding machine is provided with a DC voltage buck circuit, wherein the transmission DC voltage from transmission voltage line is boosted to the driving DC voltage by the DC voltage step-up and step-down circuit, a DC voltage for the drive It has become as to be supplied to the inverter provided in the serial electric injection molding machine configured as an injection molding machine system according to claim.
The invention according to claim 2 is the injection molding machine system according to claim 1, wherein the power supply device and the plurality of electric injection molding machines are connected to each other via a network, and information about the electric injection molding machine is The injection molding machine system is configured to be transmitted to a power supply device.
According to a third aspect of the present invention, in the injection molding machine system according to the first aspect, the injection molding machine system includes an information processing device, the information processing device, the power supply device, and a plurality of the electric injection molding devices. The machines are connected to each other via a network, and information on the electric injection molding machine is transmitted to the information processing apparatus, and is configured as an injection molding machine system.

The present invention as described above, a power supply for supplying power, Ri Do and a plurality of electric injection molding machine which is driven by being supplied with electric power from said power supply device, these by the transmission voltage line It is configured as an injection molding machine system connected to each other . The power supply device includes an AC / DC conversion circuit that converts a three-phase AC voltage supplied from a factory into a DC voltage, and a power storage device that stores power and supplies the DC voltage as necessary. power output to the transmission voltage line is in a so that the transmission DC voltage is a DC voltage for transmission from. The electric injection molding machine includes a DC voltage step-up / step-down circuit, and the transmission DC voltage from the transmission voltage line is boosted to the driving DC voltage by the DC voltage step-up / down circuit, and the driving DC voltage is supplied to the electric injection molding machine. It is supplied to the provided inverter. Since the power supply device that supplies power includes the power storage device as described above, power can be stored in the power storage device or supplied from the power storage device as necessary. As a result, the power of the three-phase AC voltage supplied from the factory to the power supply device is smoothed, and the maximum power is reduced. Therefore, the injection molding machine system according to the present invention has less burden on the power receiving equipment in the factory, and the electricity bill is reduced. Further, if the power storage capacity of the power storage device is sufficiently increased, power can be supplied to the electric injection molding machine even during a power failure, and the electric injection molding machine can be continuously operated. According to the present invention, the electric injection molding machine boosts the transmission DC voltage to the driving DC voltage by the DC voltage step-up / down circuit and supplies it to the inverter. Then, even if a large amount of power is consumed in another electric injection molding machine and the transmission DC voltage temporarily decreases, the DC voltage step-up / down circuit is appropriately controlled to stabilize the driving DC voltage constant. be able to. That is, even if the transmission DC voltage temporarily decreases, the power supply of the inverter is not affected at all. According to the present invention, the electric injection molding machine is assured that necessary electric power can be stably obtained.

  According to another invention, in an injection molding machine system, a power supply device and a plurality of electric injection molding machines are connected to each other via a network, and information relating to the electric injection molding machine is transmitted to the power supply device. According to another invention, the injection molding machine system includes an information processing device, the information processing device, the power supply device, and the plurality of electric injection molding machines are connected to each other through a network, and information about the electric injection molding machine is processed by information processing. Is sent to the device. Accordingly, in these inventions, power information and operation information of the electric injection molding machine belonging to the injection molding machine system can be transmitted and managed centrally by the power supply apparatus or the information processing apparatus. For example, in the case of power information, various power information can be managed, such as average power or instantaneous power. Such power information can be displayed on the display, or an alarm can be issued when the total power in the entire system approaches the maximum power that can be supplied by the power supply device. Furthermore, when the maximum power that can be supplied by the power supply apparatus is approached, it is possible to issue a command to the electric injection molding machine belonging to the system to delay the process that consumes a large amount of power, that is, the injection process.

It is a system block diagram which shows the injection molding machine system which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the electric power supply apparatus which concerns on embodiment of this invention, (a) (b) is a block diagram which shows the electric power supply apparatus which concerns on each different embodiment. It is a circuit diagram which shows the DC voltage step-up / down circuit provided in the electric injection molding machine according to the embodiment of the present invention. It is a system block diagram which shows the conventional injection molding machine system. It is a system block diagram which shows the conventional injection molding machine system.

  Embodiments of the present invention will be described below. As shown in FIG. 1, an injection molding machine system 1 according to an embodiment of the present invention includes one power supply device 2, a plurality of electric injection molding machines 3, 3,. It is comprised from the information processing apparatus 4 which is a controller. In this injection molding machine system 1, the power supplied from the factory power supply 5 is received at once by the power supply device 2 and is output as a transmission DC voltage that is a predetermined voltage described later. Each of the electric injection molding machines 3, 3,... Is supplied with this transmission DC voltage.

  The power supply device 2 includes an AC / DC conversion circuit 7 and a power storage device 8. The AC / DC conversion circuit 7 is a circuit that converts, for example, a 200V three-phase AC voltage supplied from the factory power supply 5 into a predetermined DC voltage, and in the present embodiment, includes a PWM converter. Since it is composed of a PWM converter, not only can the factory three-phase AC voltage be converted to a DC voltage of the desired voltage, but power is returned to the factory power source 5 if surplus power on the DC voltage side, for example, power is surplus due to regenerative power. You can also By the way, the AC / DC converter circuit 7 does not necessarily need to be configured from a PWM converter, and may be configured from, for example, a simple diode rectifier circuit. This is because the diode rectifier circuit cannot return surplus power such as regenerative power to the factory power supply 5, but the surplus power is stored in the power storage device 8 described below, so that there is substantially no problem.

  The power storage device 8 can take various configurations, but in the power supply device 2 according to the present embodiment, as shown in FIG. It is comprised from the conversion circuit 12 and the electrical storage device 13 which consists of storage batteries. The step-down charging circuit 11 includes a DC chopper circuit and is connected to a first DC voltage line 15 from which a DC voltage is output from the AC / DC conversion circuit 7. Then, the DC voltage of the first DC voltage line 15 is stepped down to be converted into a storage DC voltage suitable for storage and supplied to the second DC voltage line 16. The accumulator 13 is connected to the second DC voltage line 16 so as to obtain and store the electric power of the accumulating DC voltage. In addition, the battery 13 supplies power to the second DC voltage line 16 when the power consumption of the injection molding machine system 1 increases and the current voltage for power storage temporarily decreases. The transmission voltage conversion circuit 12 is also a DC chopper circuit and is connected to the second DC voltage line 16. Then, the storage DC voltage of the second DC voltage line 16 is boosted to a transmission DC voltage, for example, a transmission DC voltage of 200 V, and supplied to the transmission voltage line 20. When the regenerative power is regenerated from the electric injection molding machines 3, 3... And the transmission DC voltage temporarily increases, the transmission DC voltage is stepped down and supplied to the second DC voltage line 16. Sometimes. Also in this case, electric power is stored in the battery 13. As described above, the power storage device 8 stores power in the battery 13 when there is surplus power and supplies power as a transmission DC voltage to the transmission voltage line 20 as appropriate. In this embodiment, the storage DC voltage supplied to the second DC voltage line 16 is lower than the transmission DC voltage supplied to the transmission voltage line 20, but is configured as the same voltage. You can also In this case, the transmission voltage conversion circuit 12 is unnecessary, and the step-down charging circuit 11 is directly connected to the transmission voltage line 20.

  The electric injection molding machine 3 is similar to a conventionally known electric injection molding machine, a mold clamping device for clamping a mold, an injection device comprising a heating cylinder and a screw to melt and inject a resin, and a protrusion for projecting a molded product These devices are configured to be driven by a motor such as a servo motor. Inverters 22, 23, 24,... Such as servo amplifiers for driving these motors are shown in FIG. 1 as injection shaft 22, plasticizing shaft 23, mold clamping shaft 24,.

  As described above, the electric injection molding machine 3 according to the present embodiment is supplied with the transmission DC voltage from the power supply device 2 as electric power. The transmission DC voltage is supplied via the transmission voltage line 20, but when a large amount of power is consumed in another electric injection molding machine 3, the voltage temporarily changes, and the inverters 22, 23, It becomes impossible to supply a stable DC voltage. Therefore, the electric injection molding machine 3 according to the present embodiment includes a DC voltage step-up / down circuit 25 that boosts the DC voltage for transmission and converts it to a stable DC voltage suitable for the supply of the inverters 22, 23,. ing. The DC voltage step-up / down circuit 25 is connected to a transmission voltage line 20 and a driving voltage line 26 that supplies a driving DC voltage that is a driving DC voltage to the inverters 22, 23,.

  An example of the DC voltage step-up / down circuit 25 is shown in FIG. The DC voltage step-up / down circuit 25 includes first and second power transistors 28 and 29, first and second diodes 30 and 31 provided in parallel to the first and second power transistors 28 and 29, A well-known DC chopper circuit including the reactor 32 is configured. The DC voltage step-up / down circuit 25 is driven by a control device 33, and the current flowing through the reactor 32 is monitored by a current sensor 35, and the driving DC voltage is monitored by a driving voltage line 26. The first and second power transistors 28 and 29 are appropriately turned ON / OFF by the control device 33 so that the driving DC voltage on the driving voltage line 26, for example, a DC voltage of 350V is controlled to be constant. Such a DC voltage step-up / down circuit 25 can stabilize the driving DC voltage supplied to the inverters 22, 23,... Even if the transmission DC voltage fluctuates somewhat. You can also In this way, since the driving DC voltage is stably supplied, the electric injection molding machines 3, 3,... Can be driven stably.

  In general, the electric power consumed by an electric injection molding machine varies throughout the molding cycle. The power consumption in the mold opening / closing process and the weighing process is relatively small, but the power consumption in the injection process is very large. The injection molding machine system 1 according to the present embodiment receives power supplied from a factory power source 5 by a power supply device 2 in a lump, converts it into a direct current voltage for transmission, and a plurality of electric injection molding machines 3, 3, so that the power supply from the factory power supply 5 is sufficiently smoothed. That is, since the power supply device 2 includes the power storage device 8, the power storage device 8 can store power, supply power, and smooth the power consumed by the entire injection molding machine system 1. is there. Therefore, even with such a system alone, the electric power that is sufficiently consumed as a whole is smoothed, and the burden on the power receiving equipment in the factory is reduced, and the electricity bill can be reduced. Further, the injection molding machine system 1 can be operated to some extent by the electric power stored in the power storage device 8 even when the factory power supply 5 is interrupted. In other words, the effect intended by the present invention can be sufficiently obtained. However, if the injection process is performed substantially simultaneously in the plurality of electric injection molding machines 3, 3,..., The power consumed is temporarily increased, and only the power supplied from the power storage device 8 is sufficient. In some cases, the consumption of the three-phase AC voltage from the factory power source 5 temporarily increases. It is important for system administrators to understand the overall power consumption trend. Therefore, the injection molding machine system 1 according to the present embodiment exchanges information such as electric power consumed in each electric injection molding machine 3, 3,... This allows the administrator to understand the power consumption.

  As shown in FIG. 1, the injection molding machine system 1 according to the present embodiment includes a power supply device 2, an electric injection molding machine 3, 3,. Has been. Each of the electric injection molding machines 3, 3,... Sends various pieces of information related to electric power to the information processing apparatus 4. For example, the instantaneous power that is the current instantaneous power, the average power that is the average power in the entire molding cycle, the maximum power that is the maximum power in the entire molding cycle, and the like. Moreover, you may make it send an instantaneous, average electric current, and voltage in each injection molding machine 3,3, .... In addition to such power information, information on molding cycles in the injection molding machines 3, 3,..., That is, information on molding operations can be exchanged. As information regarding the molding operation, for example, information on the start and completion of each step of the molding cycle such as injection start and mold opening completion can be sent. Such information may be transmitted together with a time stamp, and the information processing device 4 totals and analyzes how much power is consumed at each timing of the molding cycle in each injection molding machine 3, 3. can do. The information processing apparatus 4 collects information on power and aggregates it as necessary. For all the electric injection molding machines 3, 3, ..., the average power may be summed to obtain the total average power of the injection molding machine system 1. The sum of the maximum power may be calculated, and the maximum power expected when the injection process is simultaneously performed in all the electric injection molding machines 3, 3,. From the power supply device 2, instantaneous power of the three-phase AC voltage supplied from the factory power supply 5, maximum power that can be supplied as a transmission DC voltage, and the like are sent to the information processing device 4. The information processing device 4 displays information regarding these powers on an attached display. When the electric power required in the electric injection molding machines 3, 3,... Is likely to exceed the maximum electric power that can be supplied from the electric power supply device 2, an alarm is issued.

  Since the injection molding machine system 1 according to the present embodiment is connected to the network, the molding cycle of each electric injection molding machine 3, 3,. For example, not only the information regarding the electric power but also the process information such as the process currently being performed and the process to be performed next are transmitted to the information processing apparatus 4 from each of the electric injection molding machines 3, 3. The information processing device 4 monitors the current power, and if it is determined that the power consumption in the molding machine system 1 has increased, a command is issued to the electric injection molding machine 3 that is scheduled to carry out the injection process, and the injection process is delayed. To. Since the injection process consumes a large amount of electric power as described above, the electric power of the entire injection molding machine system 1 can be temporarily suppressed, and the electric power supplied from the factory power source 5 can be further smoothed. In this example, the information processing device 4 grasps the process of each electric injection molding machine 3, 3,... And issues a command to a specific electric injection molding machine 3 that is about to start the injection process. However, it may be broadcast from the information processing device 4 to all the electric injection molding machines 3, 3,. That is, when the overall power consumption of the injection molding machine system 1 becomes large, an alarm is broadcast. The electric injection molding machines 3, 3,... That have received this warning voluntarily delay the injection process for a predetermined time when the injection process is to be performed. When such a method is adopted, it is not necessary for the information processing apparatus 4 to grasp the steps of the electric injection molding machines 3, 3,.

  The injection molding machine system 1 according to the present embodiment can be variously modified. For example, the power supply device 2 ′ can be modified as shown in FIG. In this embodiment, the AC / DC conversion circuit 7 converts the three-phase AC voltage supplied from the factory power supply 5 into a transmission DC voltage and supplies it directly to the transmission voltage line 20. The power storage device 8 ′ is provided on the transmission voltage line 20. The power storage device 8 ′ includes a step-up / down power storage / supply circuit 36 and a battery 13. The step-up / down storage / supply circuit 36 steps down the transmission DC voltage to a DC voltage suitable for the storage of the storage battery 13 as a storage battery. The voltage is boosted and supplied to the transmission voltage line 20 as a transmission DC voltage. The power storage device 8 can be modified in various other ways, can store the DC voltage from the AC / DC converter circuit 7 as power, and if the drop in the DC voltage for transmission is detected, Any configuration may be used as long as it can be supplied as a DC voltage for transmission.

  The injection molding machine system 1 can be modified as a whole. Specifically, the power supply device 2 can have the function of the information processing device 4 and the information processing device 4 can be omitted. In other words, information on the electric power of the electric injection molding machines 3, 3,. You may make it emit. In this case, the power supply device 2 may monitor the entire power and control the molding cycle of the electric injection molding machines 3, 3,. Further, in the present embodiment, the power supply device 2 and the electric injection molding machines 3, 3,... Are described as being connected to each other through a network, but the network connection is not essential. As described above, the effects of the present invention can be obtained sufficiently even when not connected to a network.

DESCRIPTION OF SYMBOLS 1 Injection molding machine system 2 Electric power supply apparatus 3 Electric injection molding machine 4 Information processing apparatus 5 Factory power supply 7 AC / DC conversion circuit 8 Power storage apparatus 11 Step-down charging circuit 12 Transmission voltage conversion circuit 13 Battery storage device 20 Transmission voltage line 25 DC voltage step-up / down Circuit 26 Voltage line for driving 38 Network

Claims (3)

A power supply for supplying power, Ri Do and a plurality of electric injection molding machine which is driven by power supply from said power supply device, an injection molding to which they are connected to each other by transmission voltage line Machine system,
The power supply device includes an AC / DC conversion circuit that converts a three-phase AC voltage supplied from a factory into a DC voltage, and a power storage device that stores power and supplies the DC voltage as necessary. electrical power output to the transmission voltage line from the device is to transmit a DC voltage is a DC voltage for transmission,
The electric injection molding machine includes a DC voltage step-up / down circuit, and the DC voltage for transmission from the transmission voltage line is boosted to a driving DC voltage by the DC voltage step-up / down circuit, and the driving DC voltage is An injection molding machine system that is supplied to an inverter provided in the injection molding machine. 2. The injection molding machine system according to claim 1, wherein the power supply device and the plurality of electric injection molding machines are connected to each other via a network, and information about the electric injection molding machine is transmitted to the power supply device. An injection molding machine system characterized by 2. The injection molding machine system according to claim 1, wherein the injection molding machine system includes an information processing device, and the information processing device, the power supply device, and the plurality of electric injection molding machines are connected to each other via a network, Information on an electric injection molding machine is configured to be transmitted to the information processing apparatus.

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