JP4634281B2 - Molding machine management apparatus and molding machine management method - Google Patents

Description

  The present invention relates to a molding machine management apparatus and a molding machine management method.

  Conventionally, in a molding machine, for example, an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure to fill a cavity space of a mold apparatus, and cooled and solidified in the cavity space. Then, it is taken out as a molded product.

  The injection molding machine includes the mold device, a mold clamping device, an injection device, and the like. The mold clamping device includes a fixed platen and a movable platen, and moves the movable platen forward and backward by driving a mold clamping motor. The mold is closed, clamped and opened.

  On the other hand, the injection device includes the heating cylinder that heats and melts the resin supplied from the hopper, and the injection nozzle that injects the molten resin, and a screw can freely advance and retreat in the heating cylinder, and It is rotatably arranged. When the screw is rotated by driving the metering motor, the resin weighed in front of the screw in the heating cylinder is stored, and when the screw is advanced by driving the injection motor, the resin is stored in the front. Resin is injected and filled into the cavity space of the mold apparatus in a state where mold clamping is performed.

  Then, the resin in the cavity space is cooled to become a molded product, and when the mold is opened, the ejector pin is advanced by driving the ejector motor of the ejector device, and the molded product is ejected, Mold is released.

By the way, in the injection molding machine having the above-described configuration, various motors such as a mold clamping motor, a metering motor, an injection motor, and a protruding motor are driven. When the injection molding machine is operated, In order to reduce power consumption, a predetermined motor is driven to regenerate other motors (see, for example, Patent Document 1).
JP 2002-113737 A

  However, in the conventional injection molding machine, when a plurality of injection molding machines are operated, the time when the power consumption becomes large overlaps, an overcurrent flows, the distribution board breaker operates, and each injection molding machine stops. Or the supplied power varies, and the quality of the molded product deteriorates.

  FIG. 2 is a diagram showing a transition of power consumption when operating one injection molding machine, and FIG. 3 is a diagram showing a transition of power consumption when operating a plurality of injection injection molding machines. In the figure, time is plotted on the horizontal axis and power consumption is plotted on the vertical axis. In this case, power consumption is expressed as a percentage when the maximum value of power consumption when operating one injection molding machine is set to 100.

  When one injection molding machine is operated, each of the motors is driven, and as shown in FIG. 2, for example, the power consumption changes in the range of 10 to 100% at intervals of 0.5 [s]. To do. When a plurality of, for example, four injection molding machines are operated, as shown in FIG. 3, for example, the power consumption changes in the range of 40 to 400 [%] at intervals of 0.5 [s]. .

  Therefore, when operating a plurality of injection molding machines, the capacity of the power supply device is sufficiently increased to prevent overcurrent from flowing and operating the breaker of the distribution board and the like. Therefore, the cost of the factory equipment is increased accordingly.

  The present invention solves the problems of the conventional injection molding machine, and when operating a plurality of molding machines, the capacity of the power supply device can be reduced, and the cost of the factory equipment can be reduced. An object is to provide a machine management apparatus and a molding machine management method.

  Therefore, the molding machine management apparatus of the present invention is provided with a management apparatus that manages a plurality of molding machines.

A regenerative power that distributes a regenerative current from a motor driven by regeneration of a predetermined molding machine to a motor driven by powering of another molding machine between at least two molding machines among the molding machines. A distribution processing unit; and a transmission unit for transmitting a switching signal to each drive unit of the at least two molding machines in accordance with the distribution of the regenerative current.
The drive unit of the predetermined molding machine includes a current supply unit for supplying a regenerative current to a motor of the other molding machine.

  According to the present invention, the molding machine management apparatus includes a management apparatus that manages a plurality of molding machines.

A regenerative power that distributes a regenerative current from a motor driven by regeneration of a predetermined molding machine to a motor driven by powering of another molding machine between at least two molding machines among the molding machines. A distribution processing unit; and a transmission unit for transmitting a switching signal to each drive unit of the at least two molding machines in accordance with the distribution of the regenerative current.
The drive unit of the predetermined molding machine includes a current supply unit for supplying a regenerative current to a motor of the other molding machine.

  In this case, regenerative power is distributed between a motor driven by regeneration of a predetermined molding machine and a motor driven by powering of another molding machine between at least two molding machines of each molding machine. The power consumption can be prevented from increasing in the molding cycle of each molding machine. Therefore, the capacity of the power supply device can be reduced, and the cost of factory equipment can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a molding machine management apparatus for managing an injection molding machine as a plurality of molding machines will be described.

  FIG. 4 is a conceptual diagram of an injection molding machine in the embodiment of the present invention.

  In the figure, 51 is an injection apparatus, 52 is a mold apparatus comprising a fixed mold 11 as a first mold and a movable mold 12 as a second mold, and 53 is arranged facing the injection apparatus 51. The mold clamping device provided, 54 is a plasticizing movement device that supports the injection device 51 so as to be able to advance and retreat, 55 is an ejector device, 60 is a mold thickness adjustment device that functions as a toggle adjustment device, fr1 is the injection device 51, This is a molding machine frame that supports the mold clamping device 53, the plasticizing moving device 54, and the like.

  The injection device 51 is attached to a heating cylinder 56 as a cylinder member, a screw 57 as an injection member disposed in the heating cylinder 56 so as to be rotatable and movable back and forth, and a front end of the heating cylinder 56. The injection nozzle 58, a hopper 59 disposed in the vicinity of the rear end of the heating cylinder 56, a screw shaft 61 formed to protrude from the rear end of the screw 57, and a load cell 70 as a load detection unit are connected. A front support 71 and a rear support 72, and a pressure plate 62 rotatably mounted on the screw shaft 61 and attached to the front support 71. Rotation transmission system (driving pulley as driving element, driven pulley as driven element, and driving pulley and driven pulley) And a timing belt as a transmission member stretched between the screw shaft 61 and a measuring motor 66 as a measuring drive unit connected to the screw shaft 61 through 65, and a pulley attached to the molding machine frame fr1. A belt-type rotation transmission system (consisting of a driving pulley as a driving element, a driven pulley as a driven element, and a timing belt as a transmission member stretched between the driving pulley and the driven pulley) 68 An injection motor 69 as an injection drive unit connected to a ball screw 75 as a movement direction conversion unit is provided. The ball screw 75 functions as a motion direction conversion unit that converts rotational motion into linear motion, and is attached to the ball screw shaft 73 as the first conversion element connected to the rotation transmission system 68 and the rear support portion 72. And a ball nut 74 as a second conversion element screwed with the ball screw shaft 73.

  Further, the plasticizing movement device 54 is attached to the injection device frame fr2, the injection device frame fr2, the plasticizing movement motor 77 as a plasticizing movement drive unit, and the longitudinal direction of the injection device frame fr2. The guide 78 that guides the front support portion 71 and the rear support portion 72 and the injection device frame fr2 are rotatably disposed, and are rotated by driving the plasticizing movement motor 77. A ball screw shaft 81 as one conversion element, a ball nut 82 as a second conversion element screwed to the ball screw shaft 81, a bracket 83 attached to the rear end of the heating cylinder 56, and the ball nut 82 And a spring 84 or the like as an urging member disposed between the bracket 83 and the bracket 83. The ball screw shaft 81 and the ball nut 82 constitute a ball screw 86, and the ball screw 86 functions as a motion direction conversion unit that converts rotational motion into linear motion.

  The mold clamping device 53 includes a fixed platen 91 as a first platen attached to the molding machine frame fr1, a toggle support 92 as a base plate, and a tie bar installed between the fixed platen 91 and the toggle support 92. 93, a movable platen 94 as a second platen that is disposed so as to face the fixed platen 91 and can be moved back and forth along the tie bar 93, and is disposed between the movable platen 94 and the toggle support 92. A toggle mechanism 95, a mold clamping motor 96 as a mold clamping drive unit, and a pulley / belt type rotation transmission system for transmitting the rotation generated by driving the mold clamping motor 96 to the toggle mechanism 95. (Drive pulley as drive element, driven pulley as driven element, and transmission stretched between drive pulley and driven pulley Consisting timing belt as wood.) 97 comprises the rotation transmission system 97 a ball screw 98 as a motion direction converting portion which is connected to the crosshead 99 or the like which is connected with the ball screw 98. The fixed mold 11 and the movable mold 12 are attached to the fixed platen 91 and the movable platen 94 so as to face each other.

  The ball screw 98 functions as a motion direction conversion unit that converts rotational motion into linear motion, and is attached to a ball screw shaft 101 as a first conversion element connected to the rotation transmission system 97, and a crosshead 99, A ball nut 102 is provided as a second conversion element screwed into the ball screw shaft 101.

  The toggle mechanism 95 is configured to swing with respect to a toggle lever 105 that is swingably supported with respect to the cross head 99, a toggle lever 106 that is swingably supported with respect to the toggle support 92, and a movable platen 94. A toggle arm 107 that is movably supported is provided, and the toggle levers 105 and 106 and between the toggle lever 106 and the toggle arm 107 are linked.

  The toggle mechanism 95 drives the mold clamping motor 96 to advance and retract the cross head 99 between the toggle support 92 and the movable platen 94, and advance and retract the movable platen 94 along the tie bar 93. Is brought into and out of contact with the fixed mold 11 to perform mold closing, mold clamping and mold opening.

  The ejector device 55 is disposed on the rear end surface of the movable platen 94, and is arranged to be movable forward and backward with respect to the movable platen 94. The protrusion motor 112 as a drive unit for protrusion, the cross A ball screw shaft 113 as a first conversion element disposed rotatably with respect to the head 111, and a ball as a second conversion element attached to the cross head 111 and screwed to the ball screw shaft 113 A pulley-belt type rotation transmission system (a driving pulley as a driving element, a driven pulley as a driven element, and a pulley-belt type transmission system that transmits the rotation generated by driving the nut 114 and the protruding motor 112 to the ball screw shaft 113. (It comprises a timing belt as a transmission member stretched between a driving pulley and a driven pulley.) 116, Comprising an ejector rod and ejector pins (not shown) or the like is caused to advance and retreat along with the advance and retreat of Rosuheddo 111. A ball screw 115 is constituted by the ball screw shaft 113 and the ball nut 114, and the ball screw 115 functions as a motion direction conversion unit that converts a rotational motion into a straight motion.

  The mold thickness adjusting device 60 includes an adjusting nut 121 as a toggle adjusting member that is screwed with a screw portion (not shown) formed at the rear end of each tie bar 93, and a toggle adjusting member. The mold thickness adjusting motor 122 as a driving unit for the mold thickness and the driving unit for adjusting the mold thickness, and the rotation generated by driving the motor for adjusting the mold thickness 122 is transmitted to each adjusting nut 121. A timing belt 123 as a transmission member is provided, and the toggle support 92 is moved back and forth with respect to the fixed platen 91 to adjust the mold thickness.

  Next, the operation of the injection molding machine having the above configuration will be described.

  When the plasticizing movement motor 77 is driven in the injection device 51, the rotation of the plasticizing movement motor 77 is transmitted to the ball screw shaft 81, and the ball nut 82 is moved forward and backward. Then, the thrust of the ball nut 82 is transmitted to the bracket 83 via the spring 84, and the injection device 51 is advanced and retracted.

  Next, in the weighing process, when the weighing motor 66 is driven, the rotation is transmitted to the screw shaft 61 via the rotation transmission system 65, and the screw 57 is rotated, the resin as the molding material supplied from the hopper 59 is Then, it is heated and melted in the heating cylinder 56, moved forward, and collected in front of the screw 57. Along with this, the screw 57 is retracted to a predetermined position.

  In the injection process, the injection nozzle 58 is pressed against the fixed mold 11, the injection motor 69 is driven, and the ball screw shaft 73 is rotated via the rotation transmission system 68. At this time, the pressure plate 62 moves with the rotation of the ball screw shaft 73 and advances the screw 57, so that the resin stored in front of the screw 57 is injected from the injection nozzle 58, and the fixed mold 11 and the movable mold 11 are moved. A cavity space (not shown) formed between the mold 12 is filled. The load cell 70 receives the reaction force at that time, and the pressure is detected by the load cell 70.

  Next, when the mold clamping motor 96 is driven in the mold clamping device 53 and the ejector device 55, the rotation of the mold clamping motor 96 is transmitted to the ball screw shaft 101 via the rotation transmission system 97, and the ball nut 102 is advanced and retracted, and the crosshead 99 is also advanced and retracted. As the cross head 99 advances, the toggle mechanism 95 is extended, the movable platen 94 is advanced to close the mold, and the movable mold 12 is brought into contact with the fixed mold 11. Subsequently, when the mold clamping motor 96 is further driven, a mold clamping force is generated in the toggle mechanism 95, and the movable mold 12 is pressed against the fixed mold 11 by the mold clamping force. The cavity space is formed between the mold 12. Further, when the toggle mechanism 95 is bent along with the retraction of the cross head 99, the movable platen 94 is retracted and the mold is opened.

  Subsequently, the protrusion motor 112 is driven, and the rotation generated by driving the protrusion motor 112 is transmitted to the ball screw shaft 113 via the rotation transmission system 116, and the crosshead 111 is advanced and retracted. The ejector rod is advanced and retracted. As the mold is opened, when the cross motor 111 is advanced by driving the protruding motor 112, the ejector pin is advanced, and the molded product is ejected.

  Next, when the mold thickness adjusting motor 122 is driven in the mold thickness adjusting device 60, the rotation of the mold thickness adjusting motor 122 is transmitted to each adjusting nut 121 via the timing belt 123. Is advanced and retracted with respect to the tie bar 93 as it is rotated, and the toggle support 92 is advanced and retracted. As a result, the mold thickness is adjusted, and the reference position of the toggle mechanism 95 is adjusted.

  Next, the operation of the injection molding machine having the above configuration will be described over time.

  FIG. 5 is a process chart of the injection molding machine in the embodiment of the present invention, and FIG. 6 is a time chart showing the operation of each motor in each molding cycle in the embodiment of the present invention. In FIG. 6, the broken line indicates the rotation speed of each motor, and the solid line indicates the torque.

  First, in the mold clamping device 53 (FIG. 4), when the mold clamping motor 96 is driven in the positive direction in the mold closing process P1, the movable platen 94 is moved forward to perform mold closing, and then the mold clamping process. When the mold clamping motor 96 is further driven in the forward direction at P2, the movable mold 12 is pressed against the fixed mold 11, and the mold clamping is performed with a predetermined mold clamping force.

  Subsequently, in the injection device 51, when the injection motor 69 is driven in the injection step P3 to advance the screw 57, the resin stored in front of the screw 57 is injected from the injection nozzle 58 to fill the cavity space. Is done. Thereafter, the mold apparatus 52 is cooled, and the resin in the cavity space is solidified. In the meantime, a predetermined torque is generated by the injection motor 69 to hold the pressure. Further, while the pressure is maintained, the mold clamping motor 96 is continuously driven, and the mold clamping force is generated.

  Subsequently, in the injection device 51, when the measuring motor 66 is driven in the positive direction and the screw 57 is rotated in the measuring step P4, the resin supplied from the hopper 59 is heated and melted in the heating cylinder 56. The screw 57 is stored in front of the screw 57, and the screw 57 is retracted accordingly. Further, during the measuring step P4, the injection motor 69 is driven in the forward direction and applies a back pressure to the screw 57.

  On the other hand, in the mold clamping device 53, when the mold clamping motor 96 is driven in the reverse direction in the mold loosening process P5, the mold loosening is performed. Subsequently, in the mold opening process P6, the mold clamping motor 96 is further driven in the reverse direction. Then, mold opening is performed. Accordingly, in the ejector device 55, when the projecting motor 112 is driven in the projecting step P7, the ejector pin is advanced, the molded product is released, and the molded product is taken out by an unillustrated unloader.

  In each of the motors such as the injection motor 69, the metering motor 66, the mold clamping motor 96, and the protruding motor 112, the forward movement of the screw 57 is stopped, the rotation of the screw 57 is stopped, and the movable platen 94 is stopped. When the forward / backward movement of the motor is stopped or when the forward movement of the ejector pin is stopped, the torque direction and the rotational speed direction are reversed, for example, the motor rotational speed takes a positive value, While the motor takes a negative value, the motor speed takes a negative value, while the torque takes a positive value, regeneration occurs, regenerative power is generated, and regenerative current flows through the stator coil of each motor. .

  By the way, when operating multiple injection molding machines, if the time during which the power consumption increases in the molding cycle of each injection molding machine overlaps, an overcurrent flows and the distribution board breaker, etc., operates, and each injection molding machine If the machine is stopped or the supplied power varies, the quality of the molded product deteriorates.

  Therefore, in this embodiment, when operating a plurality of injection molding machines, regenerative power generated in a predetermined injection molding machine is supplied to other injection molding machines.

  FIG. 1 is a conceptual diagram showing a main part of a molding machine control system according to an embodiment of the present invention, FIG. 7 is a diagram showing a molding machine control system according to an embodiment of the present invention, and FIG. 8 is an embodiment of the present invention. It is a figure which shows a power supply system. In FIG. 1, for convenience of explanation, a case where two motors are driven will be described.

  7 and 8, 20 is a molding machine control system as a molding machine management apparatus, Mi (i = 1, 2,...) Is a plurality of injection molding machines, and 22 is a management apparatus that manages each injection molding machine Mi. The main controller 23 is a power supply device, Fi (i = 1, 2,...) Is a controller of each injection molding machine Mi, and εi (i = 1, 2,...) Is arranged in each injection molding machine Mi. This is a drive unit for driving the motors such as the injection motor 69 (FIG. 4), the metering motor 66, the mold clamping motor 96, and the protruding motor 112.

  The operation of each injection molding machine Mi is centrally managed by the main controller 22. For this purpose, the main control unit 22 and each control unit Fi are connected, and the power supply device 23 and each drive unit εi are connected. In the present embodiment, the main control unit 22 functions as a management device, but the control unit of at least one of the injection molding machines Mi can function as a management device.

  The main control unit 22 includes an unillustrated CPU as an arithmetic unit, an unillustrated RAM used as a working memory when the CPU performs various arithmetic processes, an illustration in which various data are recorded in addition to a control program. ROM not to be provided. Similarly, each control unit Fi includes a CPU, a RAM, a ROM, and the like (not shown). The molding machine control system 20, each CPU, and the like can function as a computer based on various programs, data, and the like. Further, a recording medium is configured by RAM, ROM, and the like. An MPU or the like can be used as the arithmetic unit instead of the CPU.

  Each control unit Fi, in each injection molding machine Mi, controls each motor such as a metering motor 66, an injection motor 69, a mold clamping motor 96, and a protruding motor 112 in accordance with a driving schedule as shown in FIG. Drive at a predetermined timing. Other motors such as the plasticizing movement motor 77 and the mold thickness adjusting motor 122 are also driven at a predetermined timing based on the driving schedule.

  By the way, in the present embodiment, when a regenerative current is generated in any motor in a predetermined injection molding machine among the injection molding machines Mi, the regenerative current is supplied to any one of the other injection molding machines. It can be supplied to the motor.

  Therefore, the main control unit 22 and each drive unit εi are connected as shown in FIG. In the present embodiment, for convenience of explanation, as shown in FIG. 1, the regenerative current generated in the mold clamping motor (M) 96 of the injection molding machine M1 is used as the injection motor ( M) The case of supplying to 69 will be described.

  In FIG. 1, Iv1 and Iv2 are inverters for supplying a three-phase alternating current to the mold clamping motor 96 and the injection motor 69. The inverters Iv1 and Iv2 connect three pairs of switching elements in parallel. And is operated by selectively supplying a driving signal to each switching element. A transistor is used as each switching element.

  D1 and D2 are diodes as converters that convert alternating current applied by the power supply device 23 into direct current, and C1 and C2 are capacitors arranged in parallel with the diodes D1 and D2 and inverters Iv1 and Iv2. It is. The diodes D1 and D2 and the capacitors C1 and C2 constitute a rectifying / smoothing circuit that converts an alternating current applied by the power supply device 23 into a direct current. A converter can be provided in place of the diodes D1 and D2.

  A first load circuit comprising a regenerative resistor r1 and a switch circuit q1 connected in series with each other is connected in parallel between the capacitor C1 and the inverter Iv1, and the regenerative resistor r2 and the switch connected in series with each other. A second load circuit comprising a circuit q2 is connected in parallel between the capacitor C2 and the inverter Iv2. As the switch circuits q1 and q2, switching elements, and transistors in this embodiment are used. When a predetermined current is supplied to the base of the transistor, the collector-emitter is made conductive, the switch circuits q1, q2 are turned on, and when the supply of current to the base is stopped, the collector-emitter is cut off, The switch circuits q1 and q2 are turned off. Normally, the switch circuits q1 and q2 are turned on by a distribution switching signal as a first switching signal sent from the main control unit 22. The switch circuits q1 and q2 constitute a current supply unit for supplying a regenerative current to another injection molding machine.

  In addition, thermocouples tm1 and tm2 as load detection units and temperature detection units are disposed in the vicinity of the regenerative resistors r1 and r2, and currents generated in the thermocouples tm1 and tm2 are as follows. The sensor output is sent to the main controller 22. A temperature detection processing unit (processing unit) (not shown) of the main control unit 22 performs a temperature detection process, and detects the temperatures of the regenerative resistors r1 and r2 based on the sensor output. In this case, the temperatures of the regenerative resistors r1 and r2 represent loads applied to the regenerative resistors r1 and r2. Moreover, it can replace with thermocouples tm1 and tm2 as a load detection part and a temperature detection part, and can arrange | position a current sensor. In this case, the current flowing through the regenerative resistors r1 and r2 is measured by the current sensor, and the current is supplied to the main control unit 22 as a sensor output. The temperature detection processing means calculates the Joule heat generated in the regenerative resistors r1 and r2 based on the sensor output, and further detects the temperature of the regenerative resistors r1 and r2 based on the Joule heat.

  The drive units ε1 and ε2 are electrically connected. That is, the positive polarity side line Lp1 of the drive unit ε1 and the positive polarity side line Lp2 of the drive unit ε2 are connected via the switch Swa as the first connection element, and the negative polarity of the drive unit ε1. The polarity-side line Lm1 and the negative polarity-side line Lm2 of the drive unit ε2 are connected via a switch Swb as a second connection element. Normally, the switches Swa and Swb are turned off in response to the connection switching signal as the second switching signal from the main control unit 22, and the drive units ε1 and ε2 are disconnected.

  When the drive signal for the mold clamping motor 96 generated in the control unit F1 is supplied to the inverter Iv1, the inverter Iv1 is operated in response to the drive signal, and converts a direct current into an alternating current. Then, an alternating current is supplied to the mold clamping motor 96 to drive the mold clamping motor 96. Along with this, the mold clamping device 53 is operated and the movable platen 94 is advanced. In addition, after the driving of the mold clamping motor 96 is stopped and before the advance of the movable platen 94 is stopped, the drive signal for the mold clamping motor 96 generated in the control unit F1 is the inverter Iv1. , A regenerative current is generated in the mold clamping motor 96, and the regenerative current flows to the regenerative resistor r1 via the switch circuit q1 and is consumed by generating Joule heat in the regenerative resistor r1. Is done.

  Similarly, when the drive signal for the injection motor 69 generated in the control unit F2 is supplied to the inverter Iv2, the inverter Iv2 is operated in response to the drive signal, and converts the direct current into an alternating current. Conversion is performed, an alternating current is supplied to the injection motor 69, and the injection motor 69 is driven. Along with this, the injection device 51 is operated, and the screw 57 is advanced. Further, after the drive of the injection motor 69 is stopped, the drive signal for the injection motor 69 generated in the control unit F2 is supplied to the inverter Iv2 until the forward movement of the screw 57 is stopped. Then, a regenerative current is generated in the injection motor 69, and the regenerative current flows to the regenerative resistor r2 via the switch circuit q2, and is consumed by generating Joule heat in the regenerative resistor r2.

  By the way, a powering / regeneration determination processing unit (processing unit) (not shown) of the main control unit 22 performs powering / regeneration determination processing, reads the temperatures of the regenerative resistors r1, r2, and determines whether there is a change in temperature. It is determined whether the mold clamping motor 96 and the injection motor 69 are driven by power running or driven by regeneration. In the present embodiment, power running / regeneration determination processing is performed based on the temperatures of the regenerative resistors r1 and r2. However, an ammeter is connected to the regenerative resistors r1 and r2, and the regenerative resistors r1 and r2 are connected. Depending on whether current is flowing, power running / regeneration determination processing can be performed. The power running / regeneration determination processing unit constitutes a load detection processing unit (processing unit), and the load detection processing unit performs load detection processing and detects loads applied to the regenerative resistors r1 and r2.

  The regenerative power distribution processing means (processing unit) (not shown) of the main control unit 22 performs regenerative power distribution processing, and regenerative power generated in the motor driven by regeneration is driven by powering. It is distributed and supplied to the motor and used as auxiliary power. For example, when the mold clamping motor 96 is driven by regeneration and the injection motor 69 is driven by power running, the regenerative power distribution processing means injects the regenerative power generated by the mold clamping motor 96. The motor 69 is sent.

  For this purpose, the regenerative power distribution processing means turns on the switches Swa and Swb by sending connection switching signals to the switches Swa and Swb via a transmission unit (not shown) disposed in the main control unit 22. The parts ε1 and ε2 are connected, and the switch circuits q1 and q2 are turned off by sending a distribution switching signal to the switch circuits q1 and q2.

  As a result, the regenerative current generated in the mold clamping motor 96 is converted into a direct current in the inverter Iv1, supplied to the inverter Iv2 via the switches Swa and Swb, supplied to the injection motor 69, and injected. The motor 69 is driven.

  In the present embodiment, the load applied to the regenerative resistor is made to correspond to the load applied to the regenerative resistor, that is, from the drive unit disposed in the injection molding machine having a large load applied to the regenerative resistor, to the injection molder having a small load applied to the regenerative resistor. The regenerative current is distributed and supplied to the installed drive unit. In that case, an electric current is supplied from the injection molding machine in which the regenerative operation is performed and the large regenerative power is generated to the injection molding machine in which the power running operation is performed. Therefore, even if the regenerative power cannot be consumed by one injection molding machine, the other injection molding machine does not generate much regenerative power or if the regenerative power consumption is large, By supplying regenerative power to the injection molding machine, it is possible to sufficiently suppress the generation of heat in the regenerative resistance. Note that the load applied to the regenerative resistor can be calculated based on the power consumption obtained by the main control unit 22 and the temperature of the regenerative resistor detected by the thermocouples tm1 and tm2. In that case, a load level calculation processing unit (processing unit) (not shown) of the main control unit 22 performs a load level calculation process to calculate a load level applied to each injection molding machine Mi, and the regenerative power distribution processing unit A regenerative current can be distributed and supplied from an injection molding machine having a high load level to resistance to an injection molding machine having a low load level to regenerative resistance.

  Thus, when operating the some injection molding machine Mi, the capacity | capacitance of the power supply device 23 can be made small and the cost of factory equipment can be made low.

  FIG. 9 is a comparative diagram showing the transition of power consumption when operating a plurality of injection molding machines in the embodiment of the present invention. In the figure, time is plotted on the horizontal axis and power consumption is plotted on the vertical axis. In this case, power consumption is expressed as a percentage when the maximum value of power consumption when operating one injection molding machine is set to 100.

  When each injection molding machine Mi is operated between each injection molding machine Mi (FIG. 8) without distributing the regenerative current from the motor driven by regeneration to the motor driven by power running, as shown by the solid line, For example, the power consumption changes in the range of 40 to 400 [%] at intervals of 0.5 [s]. On the other hand, when each injection molding machine Mi is operated by distributing the regenerative current from the motor driven by regeneration to the motor driven by power running between each injection molding machine Mi, as shown by a one-dot chain line, For example, the power consumption changes in the range of 80 to 170 [%] at intervals of 0.5 [s].

  As described above, in the present embodiment, since the regenerative current is distributed and supplied from the motor driven by regeneration between the injection molding machines Mi to the motor driven by power running, the molding of each injection molding machine Mi. An increase in power consumption in the cycle can be prevented. That is, the maximum instantaneous power consumption can be reduced.

  Therefore, since the overcurrent does not flow and the breaker of the distribution board does not operate, each injection molding machine Mi is not stopped, and the supplied power does not vary, and the molded product Quality can be improved.

  Moreover, since the capacity | capacitance of the power supply device 23 can be made small, the cost of factory equipment can be made low.

  In the present embodiment, between each injection molding machine Mi, a regenerative current is distributed from a motor driven by regeneration to a motor driven by powering and supplied to operate each injection molding machine Mi. However, the operation timing of at least two of the injection molding machines Mi can be set differently.

  In the present embodiment, the distribution resistance is arranged in the drive unit εi of each injection molding machine Mi. However, since the drive units εi are connected to each other, they are common to the drive units εi. Can be provided.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a conceptual diagram which shows the principal part of the molding machine control system in embodiment of this invention. It is a figure which shows transition of the power consumption at the time of drive | operating one injection molding machine. It is a figure which shows transition of the power consumption at the time of driving | running a some injection injection molding machine. It is a conceptual diagram of the injection molding machine in embodiment of this invention. It is process drawing of the injection molding machine in embodiment of this invention. It is a time chart which shows operation | movement of each motor of each shaping | molding cycle in embodiment of this invention. It is a figure which shows the molding machine control system in embodiment of this invention. It is a figure which shows the power supply system in embodiment of this invention. It is a comparison figure which shows transition of the power consumption at the time of drive | operating the some injection molding machine in embodiment of this invention.

Explanation of symbols

20 Molding Machine Control System 22 Main Control Unit Mi Injection Molding Machine tm1, tm2 Thermocouple q1, q2 Switch Circuit εi Drive Unit

Claims (5)

In a molding machine management apparatus equipped with a management apparatus that manages a plurality of molding machines,
(A) Regeneration that distributes a regenerative current from a motor driven by regeneration of a predetermined molding machine to a motor driven by powering of another molding machine between at least two of the molding machines. A power distribution processing unit;
(B) a transmission unit for sending a switching signal to each drive unit of the at least two molding machines according to the distribution of the regenerative current ;
(C) The drive unit of the predetermined molding machine includes a current supply unit for supplying a regenerative current to a motor of the other molding machine . (A) having a load detection unit for detecting a load applied to the regenerative resistor disposed in the driving unit of the predetermined molding machine;
(B) The molding machine management device according to claim 1, wherein the regenerative power distribution processing unit distributes a regenerative current in correspondence with a load applied to the regenerative resistance detected by the load detection unit . Before SL current supply section, the molding machine managing apparatus according to claim 1 is a switch circuit for turning on and off by a switching signal sent from the management device. (A) having a load level calculation processing unit for calculating a load level of the predetermined molding machine;
(B) The molding machine management device according to claim 1, wherein the regenerative power distribution processing unit allocates a regenerative current based on a load level of the predetermined molding machine. In a molding machine management method of a molding machine management apparatus provided with a management apparatus that manages a plurality of molding machines,
(A) Distributing a regenerative current from a motor driven by regeneration of a predetermined molding machine to a motor driven by powering of another molding machine between at least two of the molding machines.
(B) With the allocation of the regenerative current, the Ri send a switch signal to the driving unit of the at least two molding machines, molding machine, characterized in that for supplying the regenerative current to the motor of the other molding machine Management method.

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