Manufacturing Equipment and Systems

Abstract

To provide a manufacturing apparatus and the like capable of reducing the number of power storage devices even when a plurality of power supply parts (for example, AC / DC converters) are used.SOLUTION: A manufacturing apparatus includes: electric motors SM1, SM2; first control parts CV1, CV2 for controlling the electric motors; power supply parts CV1, CV2; a first wiring lines W1a, W1b electrically connecting the power supply parts and the first control parts in order to supply power from the power supply parts to the first control parts; a power storage device 20; second wiring lines W2a, W2b electrically connecting the first wiring lines and the power storage device in order to charge the power storage device with regenerative electric power generated from the electric motors; and switches MS1, MS3, MS5, MS6, MS7, MS8 provided on the second wiring lines and capable of switching on / off states. A plurality of combinations of the electric motors, the first control parts, the power supply parts, the first wiring lines, the second wiring lines, and the switches are provided.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to manufacturing devices and systems. [Background technology]

[0002] A system has been proposed in which regenerative power generated by a servo motor during deceleration is stored in a power storage device and the stored regenerative power is used as power for propulsion in the next cycle (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-151150 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, one power storage device is provided for one AC / DC converter, so when multiple AC / DC converters are used, there is an issue that a number of power storage devices must be used according to the number of AC / DC converters (resulting in increased costs and the need for installation space).

[0005] The present invention has been made to solve such problems, and provides a manufacturing apparatus and system that can reduce the number of power storage devices even when using multiple power supply units (e.g., AC / DC converters). [Means for solving the problem]

[0006] The manufacturing apparatus according to the present invention comprises: An electric motor; A first control unit that controls the electric motor; A power supply unit; a first wiring that electrically connects the power supply unit and the first control unit to supply power from the power supply unit to the first control unit; A power storage device; a second wiring electrically connecting the first wiring to the power storage device so as to charge the power storage device with regenerative power generated by the electric motor; a switch provided on the second wiring and capable of switching between an on-off state; The power supply device includes a plurality of combinations of the electric motor, the first control unit, the power supply unit, the first wiring, the second wiring, and the switch.

[0007] With this configuration, the number of power storage devices can be reduced even when multiple power supply units (eg, AC / DC converters) are used.

[0008] This is because there are a plurality of combinations of the electric motor, the first control unit, the power supply unit, the first wiring, the second wiring, and the switch.

[0009] The device may further include a second control unit that controls the switch.

[0010] In this way, the connection destination of the charging device can be changed depending on the on / off state of the switch.

[0011] The manufacturing device may be an injection molding machine.

[0012] a first combination of a servo motor for opening and closing a mold as the electric motor, the first control unit, the power supply unit, the first wiring, the second wiring, and the switch; a second combination of a mold clamping servo motor as the electric motor, the first control unit, the power supply unit, the first wiring, the second wiring, and the switch, The second control unit may control the switch so that the regenerative power generated from the mold opening / closing servomotor and the mold clamping servomotor are alternately charged to the power storage device. Note that, in addition to the mold opening / closing servomotor and the mold clamping servomotor, various servomotors (ejector, half nut, etc.) used in injection molding machines may be used as the electric motor.

[0013] The power storage device may be an electric storage device developed for mounting on a vehicle, including a plurality of battery modules arranged in series.

[0014] In this way, costs can be reduced by using inexpensive power storage devices (such as nickel-metal hydride batteries or lithium-ion batteries) that have been developed and mass-produced specifically for in-vehicle installation as the power storage device. In recent years, reused products (reused inexpensive power storage devices developed and mass-produced specifically for in-vehicle installation) have also become available on the market, and using these can reduce costs further.

[0015] The battery power supply may further include a monitoring unit for controlling the charge / discharge amounts of the plurality of battery modules.

[0016] In this way, the monitoring unit controls the charge / discharge amounts of each battery module so that each battery module deteriorates uniformly, thereby making it possible to extend the life of the power storage device.

[0017] The switch may be a magnetic switch.

[0018] The power storage device may also include a charge / discharge converter that controls regenerative power and discharge power based on the state of the input voltage, and a large-capacity storage battery.

[0019] Further, a system according to the present invention is a system including a plurality of manufacturing apparatuses and a power storage device, Each of the manufacturing apparatuses includes: An electric motor; A first control unit that controls the electric motor; A power supply unit; a first wiring that electrically connects the power supply unit and the first control unit to supply power from the power supply unit to the first control unit; a second wiring electrically connecting the first wiring to the power storage device so as to charge the power storage device with regenerative power generated by the electric motor; and a switch that is provided on the second wiring and can be switched between an on-off state.

[0020] With this configuration, the number of power storage devices can be reduced even when multiple power supply units (eg, AC / DC converters) are used.

[0021] This is because each of the manufacturing devices includes an electric motor, a first control unit, a power supply unit, a first wiring, a second wiring, and a switch. Effect of the Invention

[0022] According to the present invention, it is possible to provide a manufacturing apparatus and a system that can reduce the number of power storage devices even when a plurality of power supply units (for example, AC / DC converters) are used. [Brief description of the drawings]

[0023] [Figure 1] 1 is a schematic configuration diagram of a system (energy saving system) including an injection molding machine 1. FIG. [Diagram 2] 1 is an example of a circuit (circuit diagram) used in a system (energy saving system) including an injection molding machine 1. [Diagram 3] 4 is a flowchart for explaining an example of the operation of the injection molding machine 1. [Figure 4] 4 is a flowchart for explaining an example of the operation of the injection molding machine 1. [Diagram 5] 4 is a graph showing the timing at which regenerative power is generated. [Figure 6] FIG. 2 is a hardware configuration diagram of the power storage device 20. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a manufacturing apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. In each drawing, corresponding components are given the same reference numerals, and duplicated explanations will be omitted.

[0025] First, a configuration example of a manufacturing apparatus according to this embodiment will be described with reference to Fig. 1. Below, an example in which an injection molding machine 1 is used as the manufacturing apparatus will be described.

[0026] FIG. 1 is a schematic diagram of a system (energy saving system) including an injection molding machine 1. As shown in FIG.

[0027] As shown in FIG. 1, the injection molding machine 1 includes a raw material supplying device 10, a barrel screw 11a arranged in a cylinder 11 (barrel) for melting pellet material supplied from the raw material supplying device 10 and injecting the molten pellet material (hereinafter referred to as molten resin) into a mold, a fixed platen 12, a movable platen 13 arranged to be movable in a direction approaching and moving away from the fixed platen 12 (left and right direction in FIG. 1), a mold 14A attached to the fixed platen 12, a mold 14B attached to the movable platen 13, a mold opening and closing ball screw 15 connected to the movable platen 13 for moving the movable platen 13, a mold opening and closing mechanism connected to the mold opening and closing ball screw 15 for rotating the mold opening and closing ball screw 15, and a mold opening and closing mechanism connected to the mold opening and closing ball screw 15 for rotating the mold opening and closing ball screw 15. The system is equipped with a mold clamping servo motor SM1 for opening and closing a mold, a mold opening and closing servo amplifier SA1 for controlling the mold opening and closing servo motor SM1, a mold opening and closing AC / DC converter CV1 for supplying power to the mold opening and closing servo amplifier SA1, a mold opening and closing AC power source 16, a mold clamping cylinder 17, a mold clamping pump 18 (hydraulic pump) for supplying oil to the mold clamping cylinder 17, a mold clamping servo motor SM2 connected to the mold clamping pump 18 for operating the mold clamping pump 18, a mold clamping servo amplifier SA2 for controlling the mold clamping servo motor SM2, a mold clamping AC / DC converter CV2 for supplying power to the mold clamping servo amplifier SA2, a mold clamping AC power source 19, magnet switches MS1, MS3, a power storage device 20, and a control unit 21. The mold opening and closing servo motor SM1 and the mold clamping servo motor SM2 generate regenerative power when decelerating.

[0028] The mold opening / closing servo motor SM1 and the mold clamping servo motor SM2 are examples of electric motors of the present invention. The mold opening / closing servo amplifier SA1 and the mold clamping servo amplifier SA2 are examples of a first control unit of the present invention. The magnet switches MS1, MS3, MS5, MS6, MS7, and MS8 are switches that can be switched between an on-off state (conducting state) by the control unit 21. The magnet switches MS1 and MS3 are examples of switches of the present invention.

[0029] The mold opening and closing AC / DC converter CV1 and the mold opening and closing servo amplifier SA1 are electrically connected by a first wiring W1a in order to supply power from the mold opening and closing AC / DC converter CV1 to the mold opening and closing servo amplifier SA1. The mold opening and closing AC / DC converter CV1 converts AC power supplied from the mold opening and closing AC power source 16 into DC power, and supplies the converted DC power to the mold opening and closing servo amplifier SA1 via the first wiring W1a. The mold opening and closing AC / DC converter CV1 is an example of a power supply unit of the present invention.

[0030] Similarly, the mold clamping AC / DC converter CV2 and the mold clamping servo amplifier SA2 are electrically connected by a first wiring W1b in order to supply power from the mold clamping AC / DC converter CV2 to the mold clamping servo amplifier SA2. The mold clamping AC / DC converter CV2 converts AC power supplied from the mold clamping AC power source 19 into DC power, and supplies the converted DC power to the mold clamping servo amplifier SA2 via the first wiring W1b. The mold clamping AC / DC converter CV2 is an example of a power supply unit of the present invention.

[0031] The first wiring W1a and the power storage device 20 are electrically connected by a second wiring W2a having a magnet switch MS1 provided midway.

[0032] Similarly, the first wiring W1b and the power storage device 20 are electrically connected by a second wiring W2b having a magnet switch MS3 provided midway.

[0033] The power storage device 20 is a large-capacity storage battery, for example, an inexpensive power storage device (for example, a nickel-metal hydride battery) developed and mass-produced for (dedicated to) mounting on a vehicle. Although not shown, the power storage device 20 includes a plurality of battery modules arranged in series and a monitoring unit that controls the charge / discharge amount of the plurality of battery modules. The monitoring unit controls the charge / discharge amount of each battery module so that each battery module deteriorates uniformly. As the battery module and the monitoring unit, publicly known ones can be used. FIG. 6 is a hardware configuration diagram of the power storage device 20. As shown in FIG. 6, the power storage device 20 is composed of a charge / discharge converter 21 and a large-capacity storage battery 22. The charge / discharge converter 21 is also called a power converter 21 (DC / DC converter). The charge / discharge converter 21 controls the regenerative power and the discharge power based on the state (fluctuation value and threshold value) of the input voltage. The charge / discharge converter 21 may be provided outside the power storage device 20.

[0034] It is desirable to use, as the large-capacity storage battery 22, a large-capacity, inexpensive storage battery that has been developed and mass-produced specifically for mounting on a vehicle (exclusively). This allows the cost of the power storage device 20 itself to be reduced. In addition, as the large-capacity storage battery 22, a new storage battery may be used, or a deteriorated storage battery that has been mounted on a vehicle and used for a certain period of time may be used. In the latter case, it becomes possible to effectively utilize (reuse, recycle) a storage battery that is no longer suitable for a vehicle.

[0035] When the large-capacity storage battery 22 is fully charged, the voltage is, for example, about 600 V, which is higher than the voltage (for example, about 500 V) of the mold opening / closing AC / DC converter CV1 and the mold clamping AC / DC converter CV2. It is preferable that the voltage of the large-capacity storage battery 22 is lower than the voltage of the mold opening / closing AC / DC converter CV1 and the mold clamping AC / DC converter CV2.

[0036] The control unit 21 includes a processor, RAM, ROM, etc., not shown. The control unit 21 is electrically connected to a mold opening / closing servo amplifier SA1, a mold clamping servo amplifier SA2, and magnet switches MS1, MS3, MS5, MS6, MS7, and MS8. The processor is, for example, a CPU. There may be one processor or multiple processors.

[0037] The control unit 21 (processor) executes a program read from the ROM to the RAM to control the mold opening and closing servo amplifier SA1. Specifically, the control unit 21 (processor) transmits a control signal (command signal) to the mold opening and closing servo amplifier SA1. The mold opening and closing servo amplifier SA1 controls the mold opening and closing servo motor SM1 according to the control (control signal) from the control unit 21. The mold opening and closing servo motor SM1 rotates forward or backward according to the control from the mold opening and closing servo amplifier SA1. When the mold opening and closing servo motor SM1 (rotation shaft) rotates forward, the mold opening and closing ball screw 15 to which the mold opening and closing servo motor SM1 (rotation shaft) is connected rotates forward, and the movable platen 13 (and the mold 14B attached thereto) to which the mold opening and closing ball screw 15 is connected moves in a direction approaching the fixed platen 12 (and the mold 14A attached thereto) (to the right in FIG. 1). On the other hand, when the mold opening and closing servo motor SM1 (rotating shaft) rotates in the reverse direction, the mold opening and closing ball screw 15 to which the mold opening and closing servo motor SM1 (rotating shaft) is connected rotates in the reverse direction, and the movable platen 13 (and the mold 14B attached thereto) to which the mold opening and closing ball screw 15 is connected moves in a direction away from the fixed platen 12 (and the mold 14A attached thereto) (to the left in Figure 1).

[0038] The control unit 21 (processor) also controls the mold clamping servo amplifier SA2 by executing a program read from the ROM to the RAM. Specifically, the control unit 21 (processor) transmits a control signal (command signal) to the mold clamping servo amplifier SA2. The mold clamping servo amplifier SA2 controls the mold clamping servo motor SM2 according to the control (control signal) from the control unit 21. The mold clamping servo motor SM2 rotates forward or backward according to the control from the mold clamping servo amplifier SA2. When the mold clamping servo motor SM2 (rotation shaft) rotates forward, the mold clamping pump 18 connected to the mold clamping servo motor SM2 (rotation shaft) operates, and oil is supplied to the mold clamping cylinder 17, thereby applying a mold clamping force to the molds 14A and 14B. On the other hand, when the mold clamping servo motor SM2 (rotation shaft) rotates backward, the mold clamping pump 18 connected to the mold clamping servo motor SM2 (rotation shaft) operates, and the mold clamping force applied to the molds 14A and 14B is released.

[0039] Moreover, the control unit 21 (processor) executes a program loaded from the ROM to the RAM to control the on / off state of each of the magnet switches MS1, MS3, MS5, MS6, MS7, and MS8. The control unit 21 is an example of a second control unit of the present invention. When the magnet switch MS1 is controlled to the on state, the power storage device 20 and the mold opening / closing servo amplifier SA1 (and the mold opening / closing servo motor SM1) are electrically connected, so that the power from the power storage device 20 is supplied to the mold opening / closing servo amplifier SA1 via the second wiring W2a and the first wiring W1a. Moreover, the regenerative power generated by the mold opening / closing servo motor SM1 is charged to the power storage device 20 via the first wiring W1a and the second wiring W2a.

[0040] On the other hand, when the magnet switch MS3 is controlled to the on state, the power storage device 20 and the mold clamping servo amplifier SA2 (and the mold clamping servo motor SM2) are electrically connected, so that the power from the power storage device 20 is supplied to the mold clamping servo amplifier SA2 via the second wiring W2b and the first wiring W1b. Also, the regenerative power generated from the mold clamping servo motor SM2 is charged to the power storage device 20 via the first wiring W1b and the second wiring W2b.

[0041] Next, a circuit used in a system (energy saving system) including the injection molding machine 1 will be described.

[0042] FIG. 2 is an example of a circuit (circuit diagram) used in a system (energy saving system) including the injection molding machine 1.

[0043] In Fig. 2, symbols R1 and R3 represent resistors. For example, when the voltages of the power storage device 20 and the AC / DC converter CV1 for opening and closing the mold are different, first, the magnet switches MS5 and MS6 are turned on to pass a current through the resistor R1, so that the voltages between the primary and secondary are made the same before the magnet switch MS1 is turned on, and then the magnet switch MS6 is turned off and the magnet switch MS1 is turned on. This makes it possible to suppress the occurrence of inrush current, thereby realizing the protection of the power storage device 20 and the AC / DC converter CV1 for opening and closing the mold.

[0044] In addition, when the magnet switches MS1 and MS5 are turned on, if the power storage device 20 is fully charged, the power storage device 20 does not perform charging. When the voltage of the mold opening / closing AC / DC converter CV1 exceeds a certain threshold (e.g., 740V), a switch built into the mold opening / closing AC / DC converter CV1 causes regenerative power (current) to flow to the protective resistor R2. This realizes protection of the power storage device 20.

[0045] Similarly, when the voltages of the power storage device 20 and the mold closing AC / DC converter CV2 are different, first, by turning on the magnet switches MS7 and MS8 and passing a current through the resistor R3, the voltages between the primary and secondary are made the same before the magnet switch MS3 is turned on, and then the magnet switch MS8 is turned off and the magnet switch MS3 is turned on. This makes it possible to suppress the occurrence of inrush current, thereby realizing the protection of the power storage device 20 and the mold closing AC / DC converter CV2.

[0046] Moreover, when the magnet switches MS3 and MS7 are turned on, if the power storage device 20 is fully charged, the power storage device 20 does not perform a charging operation. When the voltage of the mold clamping AC / DC converter CV2 exceeds a certain threshold (for example, 740 V), a switch built into the mold clamping AC / DC converter CV2 causes regenerative power (current) to flow to the protective resistor R4. This realizes protection of the power storage device 20.

[0047] Next, an example of the operation of the injection molding machine 1 having the above configuration will be described. Figures 3 and 4 are flow charts for explaining an example of the operation of the injection molding machine 1. Figure 5 is a graph showing the timing of generation of regenerative power. The following processing is performed by the control unit 21 (processor) executing a program loaded from the ROM to the RAM.

[0048] In the following, it is assumed that the power storage device 20 (large-capacity storage battery 22) is fully charged. Note that the charging device 20 does not have to be fully charged, and may be in any charged state. It is also assumed that the magnet switches MS1 and MS3 are both off (non-conductive). It is also assumed that the movable platen 13 is located at the mold opening position, and the molds 14A and 14B are open.

[0049] First, plasticization is performed (step S10). Plasticization is a process in which heat is applied to the pellet material supplied from the raw material supply device 10 into the cylinder 11 (barrel) to melt it. The pellet material supplied from the raw material supply device 10 is plasticized by shear heat generated by the rotation of the barrel screw 11a in the cylinder 11 (barrel) and by heating by a heater attached to the cylinder 11 (barrel).

[0050] Next, the magnet switches MS5 and MS6 are turned on (step S11). As a result, a current flows through the resistor R1, and when the measured values ​​of the voltmeters V1 and V2 become approximately the same, the magnet switch MS6 is turned off and the magnet switch MS1 is turned on (step S12). This connects the power storage device 20 to the mold opening and closing servo amplifier SA1. At this time, the power storage device 20 (charge / discharge converter 21) monitors the input voltage of the mold opening and closing servo amplifier SA1, and discharges power when the mold opening and closing servo amplifier SA1 requires power (supplies power to the mold opening and closing servo amplifier SA1).

[0051] Next, the mold is closed (step S13). The mold closing is a process of closing the mold 14A and the mold 14B. Specifically, the control unit 21 (processor) transmits a control signal (command signal) to the mold opening and closing servo amplifier SA1 to move the movable platen 13 from the mold opening position to the mold closing position. The mold opening and closing servo amplifier SA1 controls the mold opening and closing servo motor SM1 to rotate forward in accordance with the control (control signal) from the control unit 21. As a result, the mold opening and closing ball screw 15 to which the mold opening and closing servo motor SM1 (rotation shaft) is connected rotates (forward rotation), and the movable platen 13 (and the mold 14B attached thereto) to which the mold opening and closing ball screw 15 is connected moves in a direction approaching the fixed platen 12 (and the mold 14A attached thereto) (rightward in FIG. 1). At that time, the power storage device 20 (charge and discharge converter 21) detects a drop in the PN voltage of the mold opening and closing servo amplifier SA1 and starts charge and discharge conversion (step S14). Next, the power storage device 20 (the charge / discharge converter 21) boosts the storage battery voltage and supplies power to the mold opening / closing servo amplifier SA1 (step S15).

[0052] The movable platen 13 moves (accelerates, moves in a uniform linear motion, and decelerates) from the mold opening position to the mold closing position. This causes the mold 14B attached to the movable platen 13 and the mold 14A attached to the fixed platen 12 to be closed. At that time (when the mold opening / closing servomotor SM1 decelerates), as shown in Fig. 5, regenerative power P1 is generated in the mold opening / closing servomotor SM1 (step S16).

[0053] This regenerative power P1 is stored in the power storage device 20 via the wires W1a and W2a because the magnet switch MS1 is in the on state. Specifically, the power storage device 20 (charge / discharge converter 21) detects an increase in the P-N voltage of the mold opening / closing servo amplifier SA1 and starts charge / discharge conversion (step S17). Next, the power storage device 20 (charge / discharge converter 21) steps down the P-N voltage of the mold opening / closing servo amplifier SA1 to charge the large-capacity storage battery 22 with power (step S18).

[0054] Next, the magnet switches MS1 and MS5 are turned off (step S19).

[0055] Next, the magnet switches MS7 and MS8 are turned on (step S20). As a result, current flows through resistor R3, and when the measured values ​​of voltmeters V1 and V4 become approximately the same, magnet switch MS8 is turned off and magnet switch MS3 is turned on (step S21). This connects the power storage device 20 and the mold closing servo amplifier SA2. At this time, the power storage device 20 (charge / discharge converter 21) monitors the input voltage of the mold closing servo amplifier SA2, and discharges power when the mold closing servo amplifier SA2 requires power (supplies power to the mold closing servo amplifier SA2).

[0056] Next, the mold is clamped (step S22). The mold clamping is a process of applying a mold clamping force (a mold clamping force that is considered so as not to cause burrs) to the molds 14A and 14B. Specifically, the control unit 21 (processor) transmits a control signal (command signal) to the mold clamping servo amplifier SA2 in order to apply the mold clamping force to the molds 14A and 14B. The mold clamping servo amplifier SA2 controls the mold clamping servo motor SM2 to rotate forward according to the control (control signal) from the control unit 21. This causes the mold clamping pump 18 connected to the mold clamping servo motor SM2 (rotating shaft) to operate, and oil is supplied to the mold clamping cylinder 17, thereby applying the mold clamping force to the molds 14A and 14B. At that time, the power storage device 20 (charge / discharge converter 21) detects a drop in the PN voltage of the mold closing servo amplifier SA2 and starts charge / discharge conversion (step S23). Next, the power storage device 20 (charge / discharge converter 21) boosts the storage battery voltage and supplies power to the mold closing servo amplifier SA2 (step S24).

[0057] Next, injection is performed (step S25). Injection is a process in which the plasticized molten resin is injected (injected) into the molds 14A and 14B that are clamped as described above. This is performed by a known extrusion device.

[0058] Next, mold clamping release is performed (step S26). Mold clamping release is a process of removing (or reducing) the mold clamping force applied to the molds 14A and 14B after cooling. Specifically, the control unit 21 (processor) transmits a control signal (command signal) to the mold clamping servo amplifier SA2 in order to release the mold clamping force applied to the molds 14A and 14B. The mold clamping servo amplifier SA2 controls the mold clamping servo motor SM2 to rotate in the reverse direction according to the control (control signal) from the control unit 21. This causes the mold clamping pump 18 connected to the mold clamping servo motor SM2 (rotating shaft) to operate, and the mold clamping force applied to the molds 14A and 14B is released. At that time (when the mold clamping servo motor SM2 decelerates), regenerative power P2 is generated in the mold clamping servo motor SM2 as shown in FIG. 5 (step S26).

[0059] This regenerative power P2 is stored in the power storage device 20 via the wires W1b and W2b because the magnet switch MS3 is in the on state. Specifically, the power storage device 20 (charge / discharge converter 21) detects an increase in the PN voltage of the mold closing servo amplifier SA2 and starts charge / discharge conversion (step S27). Next, the power storage device 20 (charge / discharge converter 21) reduces the PN voltage of the mold closing servo amplifier SA2 to charge the large-capacity storage battery 22 with power (step S28).

[0060] Next, the magnet switches MS3 and MS7 are turned off (step S29), and the magnet switches MS5 and MS6 are turned on (step S30). Next, the magnet switch M6 is turned off, and the magnet switch MS1 is turned on (step S31). This causes power (including the regenerative power stored in step S21) to be supplied from the power storage device 20 to the mold opening and closing servo motor SM1 (step S24). At that time, if the voltage of the power storage device 20 becomes lower than the voltage of the mold opening and closing AC / DC converter CV1, power is supplied from the mold opening and closing AC / DC converter CV1 to the mold opening and closing servo motor SM1 (and the mold opening and closing servo amplifier SA1).

[0061] Next, the mold is opened (step S32). The mold opening is a process of opening the mold 14A and the mold 14B. Specifically, the control unit 21 (processor) transmits a control signal (command signal) to the mold opening and closing servo amplifier SA1 to move the movable platen 13 from the mold closing position to the mold opening position. The mold opening and closing servo amplifier SA1 controls the mold opening and closing servo motor SM1 to rotate in the reverse direction according to the control (control signal) from the control unit 21. As a result, the mold opening and closing ball screw 15 to which the mold opening and closing servo motor SM1 (rotating shaft) is connected rotates (reversely rotates), and the movable platen 13 (and the mold 14B attached thereto) to which the mold opening and closing ball screw 15 is connected moves in a direction away from the fixed platen 12 (and the mold 14A attached thereto) (leftward in FIG. 1). At that time, the power storage device 20 (charge and discharge converter 21) detects a drop in the PN voltage of the mold opening and closing servo amplifier SA1 and starts charge and discharge conversion (step S33). Next, the power storage device 20 (the charge / discharge converter 21) boosts the storage battery voltage and supplies power to the mold opening / closing servo amplifier SA1 (step S34).

[0062] The movable platen 13 moves (accelerates, moves in a uniform linear motion, and decelerates) from the mold closing position to the mold opening position. This opens the mold 14B attached to the movable platen 13 and the mold 14A attached to the fixed platen 12. At that time (when the mold opening / closing servomotor SM1 decelerates), as shown in Fig. 5, regenerative power P3 is generated in the mold opening / closing servomotor SM1 (step S35).

[0063] This regenerative power P3 is stored in the power storage device 20 via the wires W1a and W2a because the magnet switch MS1 is in the on state. Specifically, the power storage device 20 (charge / discharge converter 21) detects an increase in the P-N voltage of the mold opening / closing servo amplifier SA1 and starts charge / discharge conversion (step S36). Next, the power storage device 20 (charge / discharge converter 21) reduces the P-N voltage of the mold opening / closing servo amplifier SA1 to charge the large-capacity storage battery 22 with power (step S37).

[0064] Next, the magnet switches MS1 and MS5 are turned off (step S38).

[0065] Next, the molded article is removed from the molds 14A and 14B that have been opened as described above (step S39). Specifically, the molded article is pushed out from the molds 14A and 14B by an ejector pin and removed.

[0066] Thereafter, the processes in steps S1 to S27 are repeatedly executed.

[0067] As described above, the control unit 21 controls the magnetic switches MS1, MS3, MS5, MS6, MS7, and MS8 so that the regenerative power generated from the servo motor SM1 for opening and closing the mold and the regenerative power generated from the servo motor SM2 for clamping the mold are alternately charged to the power storage device 20 (large-capacity storage battery 22).

[0068] As described above, according to this embodiment, even if a plurality of power supply units (for example, the mold opening / closing AC / DC converter CV1, the mold clamping AC / DC converter CV2) are used, it is not necessary to prepare a power storage device 20 for each AC / DC converter. In other words, the number of power storage devices 20 (large-capacity storage batteries 22) can be reduced.

[0069] This is because there are multiple combinations of a servo motor, a servo amplifier, an AC / DC converter, a first wiring, a second wiring, and a magnet switch.

[0070] Furthermore, according to this embodiment, by controlling the on / off states of the magnetic switches MS1, MS3, MS5, MS6, MS7, and MS8, the connection destination of the power storage device 20 (large-capacity storage battery 22) can be switched, and regenerative power from multiple servo motors can be stored in one power storage device 20 (large-capacity storage battery 22).

[0071] Furthermore, according to this embodiment, an inexpensive power storage device developed for mounting on a vehicle and including multiple battery modules arranged in series is used as the power storage device 20 (large-capacity storage battery 22), thereby making it possible to reduce costs.

[0072] Furthermore, according to this embodiment, the charge / discharge amount of each battery module is controlled by a monitoring unit that controls the charge / discharge amount of the multiple battery modules so that each battery module deteriorates uniformly, thereby extending the life of the energy storage device 20.

[0073] Furthermore, if both magnet switches MS1 and MS3 are always on, the power supply units (AC / DC converters) will be connected in parallel. In equipment where a one-to-one relationship between AC / DC converters and servo amplifiers is assumed, connecting the DC units in parallel can cause bias in the power from the power supply units between the AC / DC converters.

[0074] According to the present embodiment, this problem (problem of bias) can be solved by switching the magnet switches MS1 and MS3 between on and off.

[0075] Next, advantages of this embodiment compared to the above-mentioned prior art documents will be described.

[0076] In the above prior art documents, multiple servo motors are provided for one AC / DC converter. In contrast, in this embodiment, one servo motor is provided for one AC / DC converter. This has the advantages of being able to select an AC / DC converter suitable for each servo motor and being able to easily identify a servo motor in which an abnormality has occurred.

[0077] Next, a modified example will be described.

[0078] In the above embodiment, the mold opening / closing servomotor SM1 and the mold clamping servomotor SM2 are used as electric motors, but the present invention is not limited to this. For example, various motors used in the injection molding machine 1 (e.g., injection servomotor, metering servomotor, and ejector servomotor) may be used as electric motors. In addition, motors that generate regenerative power other than servomotors may be used as electric motors.

[0079] In the above embodiment, the magnet switch (a switch such as a contact relay including a movable contact) is used as the switch, but the present invention is not limited to this. For example, a non-contact relay (such as a solid-state relay) that does not include a movable contact may be used as the switch.

[0080] In the above embodiment, an example has been described in which one injection molding machine 1 is used as the manufacturing device, but the present invention is not limited to this. For example, a plurality of injection molding machines 1 may be used as the manufacturing device.

[0081] In the above embodiment, the injection molding machine 1 is used as the manufacturing device, but the present invention is not limited to this. For example, a press molding machine may be used as the manufacturing device.

[0082] For example, when the pressing process is performed in multiple steps (e.g., four steps), four press molding machines are prepared, and the servo motors for opening and closing the molds of each press molding machine are electrically connected to the power storage device 20 in the same manner as in the above embodiment. Then, each press molding machine is operated with a different timing. This makes it possible to achieve the same effects as in the above embodiment.

[0083] In the above embodiment, the program includes a set of instructions (or software code) that, when loaded into a computer, causes the computer to perform one or more functions described in the embodiment. The program may be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, the computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray® disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, the transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0084] All the numerical values ​​shown in the above embodiment are merely examples, and it goes without saying that other appropriate numerical values ​​can be used.

[0085] The above-described embodiment is merely an example in all respects. The present invention should not be construed as being limited by the description of the above-described embodiment. The present invention can be implemented in various other forms without departing from the spirit or main characteristics thereof. [Explanation of symbols]

[0086] 1…Injection molding machine 10...Raw material supply device 11...Cylinder 11a…Barrel screw 12...Fixed platen 13... Movable platen 14A, 14B...Mold 15...Ball screw for mold opening and closing 16…AC power supply for mold opening / closing 17...Mold clamping cylinder 18…Mold clamping pump 19…AC power supply for mold clamping 20...Electricity storage device 21...Control unit CV1...AC / DC converter for mold opening and closing CV2: AC / DC converter for clamping MS1, MS3, MS5, MS6, MS7, MS8...Magnetic switches P1-P3…Regenerative power R1-R4…Resistance SA1...Mold opening and closing servo amplifier SA2: Servo amplifier for mold clamping SM1...Mold opening and closing servo motor SM2: Servo motor for clamping V1, V2, V4…Voltmeter W1a, W1b...First wiring W2a, W2b: Second wiring

Claims

1. An electric motor; A first control unit that controls the electric motor; A power supply unit; a first wiring that electrically connects the power supply unit and the first control unit to supply power from the power supply unit to the first control unit; A power storage device; a second wiring electrically connecting the first wiring to the power storage device so as to charge the power storage device with regenerative power generated by the electric motor; a switch provided on the second wiring and capable of switching between an on-off state; A manufacturing apparatus including a plurality of combinations of the electric motor, the first control unit, the power supply unit, the first wiring, the second wiring, and the switch.

2. The manufacturing apparatus according to claim 1 , further comprising a second control unit that controls the switch.

3. The manufacturing apparatus according to claim 2 , wherein the manufacturing apparatus is an injection molding machine.

4. a first combination of a servo motor for opening and closing a mold as the electric motor, the first control unit, the power supply unit, the first wiring, the second wiring, and the switch; a second combination of a mold clamping servo motor as the electric motor, the first control unit, the power supply unit, the first wiring, the second wiring, and the switch, The manufacturing apparatus according to claim 3 , wherein the second control unit controls the switch so that the regenerative power generated from the servo motor for opening and closing the mold and the regenerative power generated from the servo motor for clamping the mold are alternately charged to the storage device.

5. 5. The manufacturing apparatus according to claim 1, wherein the power storage device is an power storage device developed for mounting on a vehicle and includes a plurality of battery modules arranged in series.

6. The manufacturing apparatus according to claim 5 , further comprising a monitoring unit for controlling the charge / discharge amounts of the plurality of battery modules.

7. The manufacturing apparatus according to claim 1 , wherein the switch is a magnetic switch.

8. The manufacturing apparatus according to claim 1 , wherein the power storage device includes a charge / discharge converter that controls regenerative power and discharge power based on a state of an input voltage, and a large-capacity storage battery.

9. A system including a plurality of manufacturing devices and a power storage device, Each of the plurality of manufacturing apparatuses includes: An electric motor; A first control unit that controls the electric motor; A power supply unit; a first wiring that electrically connects the power supply unit and the first control unit to supply power from the power supply unit to the first control unit; a second wiring electrically connecting the first wiring to the power storage device so as to charge the power storage device with regenerative power generated by the electric motor; a switch provided on the second wiring and capable of being switched between an on-off state.

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