JP5044621B2 - Control device for injection molding machine - Google Patents

Description

  The present invention relates to a control device for an injection molding machine suitable for use in detecting power consumption during operation displayed on a display.

  Conventionally, as an apparatus provided with power consumption detection means for detecting power consumption during operation and display means for performing display related to the power consumption based on the detected power consumption, a machine power consumption display disclosed in Patent Document 1 is disclosed. A device is known, and the document 1 includes a power consumption display device of a machine that includes power consumption elements related to driving or control and repeatedly executes the same operation, and shows the power consumption in one cycle of repeated operation. There is disclosed a machine power consumption display device comprising means for detecting and displaying, printing, storing in a recording medium, or outputting to a communication line power consumption elements or machine power consumption in each cycle.

Japanese Patent No. 3088403

  However, the above-described conventional machine power consumption display device (control device) has the following problems.

  First, since the power consumption in one cycle of the repetitive operation, particularly the power consumption related to the servo motor, is detected using the winding resistance of the servo motor and the average drive current fed back from the servo motor during one molding cycle, Power consumption other than the winding of the servo motor is not reflected, and when the winding resistance, which is normally set as a fixed value, changes due to ambient temperature, deterioration over time, etc., the error increases and reliability is increased. Therefore, it is impossible to detect the accurate power consumption.

  Second, basically, the display is limited to the display of power consumption, which is insufficient from the viewpoint of securing a wide variety of information. Therefore, it is difficult to sufficiently grasp the operation state of the machine, and there is a possibility that the determination on the operation state and further the countermeasure (measure) associated therewith cannot be performed accurately. Reducing carbon dioxide emissions is an important issue from the perspective of preventing global warming and saving resources. However, on the actual site side, reducing power consumption is an unfavorable factor that reduces machine production capacity. For example, it is not possible to expect a sufficient awareness change or effect for reducing carbon dioxide emissions simply by displaying power consumption. In addition, since the power consumption is only detected and displayed, it is only possible to grasp the current state of power consumption, and as a countermeasure in the future, for example, how much change can be made to achieve the objective when changing molding conditions, etc. It is not possible to respond adequately and appropriately.

  An object of the present invention is to provide a control device for an injection molding machine that solves the problems existing in the background art.

  In order to solve the above-described problems, the present invention is configured to detect power consumption Wo during operation including power consumption Wm related to the electric motor 11, and designated detection arbitrarily designated from the detected power consumption Wo. When configuring the control device 1 of the injection molding machine M including the power amount calculation means 3 for obtaining the power amount Po at the time Tc and the information display means 5 capable of displaying the power amount Po, the power consumption Wm related to the electric motor 11 is calculated. , Wm = (2π × Tm × Rm) × (ηa × ηb × ηc) / 60 (where Tm is the output torque), which is an arithmetic expression using the output torque Tm and the rotational speed Rm that are mechanical outputs of the electric motor 11 [Nm], Rm: rotational speed [rpm], [eta] a: motor efficiency, [eta] b: servo amplifier efficiency, [eta] c: power factor).

  In this case, according to a preferred aspect of the invention, the output torque Tm can be obtained from the current flowing through the electric motor 11, and the rotational speed Rm can be detected by the rotary encoder 34 attached to the electric motor 11. Further, the power consumption Wm related to the electric motor 11 can be obtained by an arithmetic expression of Wm = (2π × Tm × Rm) × 0.729 / 60. It is desirable that the power consumption Wo during operation includes the power consumption Wh related to the electric heaters 12. On the other hand, the control device 1 includes conversion information calculation means 4 for obtaining one or more predetermined conversion information Ca ... from the electric energy Po obtained from the electric energy calculation means 3, and one or more obtained conversions. It is possible to provide information display means 5 capable of displaying the information Ca ... along with the power amount Po. The conversion information Ca ... includes information Ca relating to the carbon dioxide emission amount, information Cb relating to the electricity bill, prediction of the future. One or more of the information Cc related to the information Cd and the information Cd related to the fluctuation amount with respect to the past information can be included. Further, the information Cc related to the future prediction can include information obtained based on the conversion database B of the power consumption with respect to the change amount of the molding condition when the molding condition is changed.

  According to the control device 1 of the injection molding machine M according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) Since the power consumption detecting means 2 for obtaining the power consumption Wm related to the electric motor 11 by calculation using the output torque Tm and the rotational speed Rm as the machine output of the electric motor 11 is provided, so to speak, the mechanical power of the electric motor 11 Thus, it is possible to obtain the power consumption Wm as the final output, and it is possible to detect the accurate power consumption Wm in which reliability is ensured.

  (2) If the output torque Tm is obtained from the current flowing through the electric motor 11 and the rotational speed Rm is detected by the rotary encoder 34 attached to the electric motor 11 according to a preferred embodiment, additional detection means is added. In addition, the existing configuration can be used at a low cost.

  (3) By including the power consumption Wh related to the electric heaters 12 in the power consumption Wo during operation according to a preferred mode, the main power consumption generated in the injection molding machine M can be covered, so that the processing is simplified. It is possible to obtain a good performance while achieving the above.

  (4) According to a preferred embodiment, the control device 1 obtains one or two or more pieces of predetermined conversion information Ca... From the electric energy Po obtained from the electric energy calculator 3 and the obtained one. Alternatively, if the information display means 5 capable of displaying two or more pieces of conversion information Ca ... along with the power amount Po is provided, in addition to the display of the power amount Po, the display of various conversion information Ca, Cb ... It is possible to fully understand the operating status of the system, and to judge the operating status and to take appropriate measures (measures) accordingly, and thus contribute effectively to global warming and resource saving. be able to.

  (5) According to a preferred embodiment, if information Ca related to carbon dioxide emissions is included in the conversion information, information Ca related to carbon dioxide emissions can be grasped in addition to grasping the amount of power Po. It can contribute to the reform of awareness related to the reduction of carbon emissions and the effective reduction of the emissions.

  (6) If information Cb related to the electricity bill is included in the conversion information according to a preferred aspect, the information Cb related to the electricity bill can be grasped in addition to grasping the amount of electricity Po. The reduction effect can be further increased. In particular, when combined with information Ca related to carbon dioxide emissions, the awareness and effective reduction of carbon dioxide emissions can be further enhanced by recognizing both the familiar problems on the site side and those not so familiar. A synergistic effect can be expected.

  (7) If information Cc related to future prediction is included in the conversion information according to a preferred aspect, in addition to grasping the current power amount Po, it is possible to grasp the power amount in the future, the carbon dioxide emission amount, etc. in advance. Therefore, for example, it is possible to take necessary countermeasures at an earlier stage, such as changing the molding conditions at an earlier stage.

  (8) According to a preferred embodiment, if the conversion information includes the information Cd related to the fluctuation amount with respect to the past information, the information Cd related to the fluctuation amount can be grasped in addition to grasping the current electric energy Po. It is possible to easily and accurately grasp the increase / decrease of the electric energy Po with the passage of time.

  (9) According to a preferred embodiment, when the information Cc related to the future prediction includes information obtained based on the conversion database B of the power consumption with respect to the change amount of the molding condition when the molding condition is changed, the molding is performed. When changing the conditions, it is possible to make more appropriate changes at an early stage, such as how much changes can be made to achieve the objective.

The functional block diagram which extracts and shows the principal part of the control apparatus of the injection molding machine concerning the best embodiment of the present invention, Overall configuration diagram of the injection molding machine, A layout diagram showing a dedicated display screen used for the control device, A flow chart for explaining the operation of the control device; A flowchart for explaining in detail conversion processing steps in the flowchart, A flowchart for explaining a method of displaying prediction data on the dedicated display screen; The flowchart for demonstrating the display method of the information regarding the prediction at the time of changing the molding conditions which concern on the example of a change of the same control apparatus, Figure of mold clamping force vs. power consumption characteristic of database used for displaying information related to prediction when changing molding conditions according to the modification example,

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, the structure of the injection molding machine M provided with the control apparatus 1 which concerns on this embodiment is demonstrated with reference to FIGS.

  FIG. 2 shows the overall configuration of the injection molding machine M, which includes an injection device Mi and a mold clamping device Mc. The injection device Mi includes a heating cylinder 21, which has an injection nozzle 22 at the tip and a hopper 23 at the rear, and the heating cylinder 21 and the injection nozzle 22 are electrically heated mounted on their outer peripheral surfaces. Heaters 12 are provided. The heating cylinder 21 is loaded with a screw 24, and a rear end of the heating cylinder 21 is provided with an injection cylinder 25 that drives the screw 24 forward and backward, and a metering motor (oil motor) 26 that drives the screw 24 to rotate. . On the other hand, the mold clamping device Mc includes a fixed plate 28 and a movable plate 29 that support the mold 27, and a mold clamping cylinder 30 that opens / closes and molds the mold 27 by driving the movable plate 29 forward and backward. Is provided. Although not shown in the figure, the other actuator is an injection that performs a nozzle touch on the mold 27 or releases it by moving the protruding cylinder or injection device Mi for projecting (ejecting) the molded product in the mold 27. A device moving cylinder is provided.

  On the other hand, 31 is a hydraulic drive unit, which includes a hydraulic pump 32 using a variable discharge hydraulic pump as a hydraulic drive source and a hydraulic panel 33 provided with various switching valves. The hydraulic pump 32 includes the electric motor 11 using a servo motor. The hydraulic pump 32 is rotationally driven by the electric motor 11, and the rotational speed of the electric motor 11 is detected by a rotary encoder 34 attached to the electric motor 11. Reference numeral 35 denotes an oil tank.

  Reference numeral 1 denotes a control device, which includes a molding machine controller 41 having a computer function for controlling the entire injection molding machine M. FIG. 1 shows functional blocks extracted from the main part of the control device 1 according to this embodiment in the molding machine controller 41. The molding machine controller 41 includes a main control system 51 that performs main control, and the main control system 51 is connected to the above-described electric motor (servo motor) 11 via a built-in servo circuit. Accordingly, if the rotational speed of the electric motor 11 is variably controlled, the discharge flow rate and the discharge pressure of the hydraulic pump 32 can be varied. Therefore, the cylinders 25, 30... Control of each operation process in the cycle can be performed. Further, the main control system 51 is connected to the electric heaters 12 through built-in heater drivers. Thus, the foot control is performed on the electric heaters 12 by the main control system 51 so that the temperatures of the heating cylinder 21 and the injection nozzle 22 become preset target temperatures.

  The power supply line Lm from the main control system 51 to the electric motor 11 is provided with a power detection unit 52 for detecting the power consumption Wm of the electric motor 11, and the power supply line Lh for the electric heaters 12 is provided with an electric heater. A power detection unit 53 for detecting power consumption Wh of 12. In this case, the power detection unit 52 and the power detection unit 53 may detect the power consumption Wm related to the electric motor 11 and the power consumption Wh related to the electric heaters 12. Therefore, it may be detected directly by connecting a power meter or the like, or may be obtained by calculation from each detected physical quantity (current, voltage, etc.). For example, in the case of power consumption Wm related to the electric motor 11, Wx is the machine output [W], ηa is the motor efficiency, ηb is the servo amplifier efficiency, ηc is the power factor, Tm is the output torque [Nm], and Rm is the rotational speed [ rpm], the power consumption Wm is

Wm = Wx / (ηa × ηb × ηc)
≒ Wx / 0.729
= (2π × Tm × Rm) × 0.729 / 60
Therefore, the power consumption Wm can be calculated by detecting Tm and Rm. In this case, Tm can be obtained from the current flowing through the electric motor 11, and Rm can be obtained from the rotational speed detected by the rotary encoder 34. This embodiment illustrates this detection method.

  As described above, if the power consumption Wm related to the electric motor 11 and the power consumption Wh related to the electric heaters 12 are used as targets for detecting the power consumption, the main power consumption generated in the injection molding machine M can be covered. There is an advantage that good performance can be obtained while simplifying the processing.

  On the other hand, the detection results of the power detection units 52 and 53 are given to the corresponding power amount calculation units 54 and 55, respectively, and the calculation results of the power amount calculation units 54 and 55 are sent to the total power amount calculation unit 56. Is granted. The calculation result of the total power calculation unit 56 is given to the display output unit 58, and the calculation result of the total power calculation unit 56 is given to the conversion information calculation unit 57. The calculation result of 57 is given to the display output unit 58.

  On the other hand, the display 42 is connected to the display output unit 58. The display 42 is provided with a touch panel 42p. Input data input (designated) by the touch panel 42p is given to the main control system 51. In particular, in the control device 1 according to the present embodiment, the designated detection time Tc is designated by the touch panel 42p in order to obtain the power amount Po of the arbitrarily designated designation detection time Tc. The designated designation detection time Tc is: It is given to each electric energy calculation part 54,55. FIG. 3 shows a dedicated display screen Vs for displaying a plurality of conversion information Ca, Cb... And a power amount Po, which will be described later, displayed on the display 42, and the designated detection time Tc is input from the dedicated display screen Vs. (Specify).

  The molding machine controller 41 and the display 42 (touch panel 42p) having such a configuration constitute a main part according to the present embodiment. In particular, the power detection units 52 and 53 constitute power consumption detection means 2 for detecting power consumption during operation, that is, power consumption related to the electric motor 11 and power consumption related to the electric heaters 12. The units 54 and 55 and the total power amount calculation unit 56 constitute the power amount calculation unit 3 that obtains the power amount Po at the designated detection time Tc arbitrarily specified from the power consumption detected by the power consumption detection unit 2. Further, the conversion information calculation unit 57 constitutes the conversion information calculation unit 4 for obtaining a plurality of predetermined conversion information Ca, Cb... From the power amount Po obtained by the power amount calculation unit 3, and the display processing unit 58 and the display. 42 constitutes an information display means 5 capable of displaying a plurality of obtained conversion information Ca, Cb... Together with the electric energy Po.

  Further, the molding machine controller 41 is connected to the hydraulic panel 33 via a built-in sequence controller, and includes a sensor group 43 including various sensors such as a position sensor, a pressure sensor, and a temperature sensor that detect an operation state of the injection molding machine M. The rotary encoder 34 attached to the electric motor 11 is connected to the input port of the molding machine controller 41. Reference numeral 41m denotes a memory used for construction of various databases built in the molding machine controller 41.

  Next, operation | movement of the control apparatus 1 which concerns on this embodiment is demonstrated according to the flowchart shown in FIG. 4 (FIG.5 and FIG.6), referring FIGS. 1-3.

  First, FIG. 3 shows a dedicated display screen Vs when displaying a plurality of pieces of conversion information Ca, Cb... And electric energy Po. The dedicated display screen Vs can be displayed by selecting the power information screen key 61. The dedicated display screen Vs includes a detection time designating unit 62 for designating an arbitrary designated detection time Tc for obtaining the electric energy Po from the detected power consumption, a unit selection unit 63 for selecting a unit of the designated detection time Tc, and current data A display switching unit 64 for switching the display of the prediction data, a prediction period setting unit 65 for setting a prediction period for obtaining the prediction data, and a unit selection unit 66 for selecting a unit of the prediction period. Therefore, the user can designate (input) an arbitrary designated detection time Tc in advance by the detection time designating unit 62. At this time, the unit of the designated detection time Tc is selected by the unit selection unit 63. The example shows a case where 60 [minutes] is specified. Thereby, since the electric energy Po every 60 [minutes] is obtained sequentially, necessary processing such as conversion processing is performed based on this. Further, the display switching unit 64 switches between the current data related to the power amount Po and the like every 60 [minutes] and the future prediction data (information Cc related to the prediction) based on the current data every 60 [minutes]. can do. In this case, since the display switching unit 64 has the current key 64p and the prediction key 64f, it can be selected by each key 64p or 64f. The example shows a case of predicting after 1 [day] (1 [day] minutes).

  The dedicated display screen Vs also includes a power amount display unit 67 that displays the current (or predicted) power amount Po, and a carbon dioxide emission display unit that displays information Ca related to the current (or predicted) carbon dioxide emission amount. 68, an electricity charge display unit 69 for displaying information Cb related to the current (or forecast) electricity charge, an electric energy fluctuation amount display unit 70 for displaying information Cd related to the fluctuation amount of the electric energy Po with respect to the previous time, and carbon dioxide for the previous time The carbon dioxide fluctuation amount display unit 71 that displays information Cd related to the fluctuation amount of the emission amount Ca, the electric charge fluctuation amount display unit 72 that displays information Cd related to the fluctuation amount of the electric charge Cb relative to the previous time, the electric energy Po and / or A first graph display unit 73 that displays the conversion information Ca... In a time series by a bar graph, and a second graph display unit 74 that displays the fluctuation rate of the electric energy Po and / or the conversion information Ca. Including the various display units.

  Hereinafter, a specific display method on the dedicated display screen Vs will be described. Now, it is assumed that the injection molding machine M is in an operating state (steps S1 and S2). During the operation of the injection molding machine M, the power detection units 52 and 53 shown in FIG. 1 detect the power consumption Wm related to the electric motor 11 and the power consumption Wh related to the electric heaters 12 (steps S3 and S4). The power consumption Wm and Wh are sampled every control cycle (for example, 500 [μsec]). In addition, since the electric heaters 12 are configured by mounting a plurality of band heaters on the heating cylinder 21 and the injection nozzle 22, the power consumption Wh related to the electric heaters 12 is detected as the sum of these. On the other hand, the respective power consumptions Wm and Wh detected by the respective power detection units 52 and 53 are respectively given to the corresponding power amount calculation units 54 and 55, and the respective power amount calculation units 54 and 55 give the given power consumption Wm. , Wh is performed to integrate the electric energy (steps S5 and S6).

  On the other hand, the molding machine controller 41 monitors the time, and the calculation result (integration result) of each of the power amount calculation units 54 and 55 is the total power amount as the specified designated detection time Tc (60 [minutes]) elapses. It is given to the calculation unit 56 (steps S7 and S8). In the total power calculation unit 56, the integration result given from each of the power calculation units 54 and 55, that is, the power consumption of 60 [minutes] of the power consumption Wm related to the electric motor 11 and the power consumption related to the electric heaters 12 ... The power amount of 60 [minutes] of Wm is added to obtain a total power amount Po (step S9). And the calculation result of the total electric energy calculating part 56 is provided to the conversion information calculating part 57, and the conversion process from the electric energy Po to several various conversion information Ca ... is performed (step S10).

  This conversion processing method will be described with reference to FIG. In the conversion process, the carbon dioxide emission amount based on the power amount Po is calculated, and information Ca related to the carbon dioxide emission amount is obtained (step S101). In this case, a conversion database of carbon dioxide emission with respect to the amount of electric power can be set in advance, and the carbon dioxide emission can be obtained using this conversion database. In addition, since carbon dioxide emission amount also changes with kinds of electric power to be used, it can obtain | require by setting the well-known database used as a standard, and setting a coefficient as needed. For example, when a part of power is provided by solar power generation or the like, a coefficient corresponding to the ratio of the supplied power is set. As described above, if the information Ca related to the carbon dioxide emission amount is included as the conversion information, the information Ca related to the carbon dioxide emission amount can be grasped in addition to the grasp of the electric power amount Po. This can contribute to reforming the awareness of reductions and further effective reduction of the emissions.

  Further, an electricity bill based on the amount of power Po is calculated, and information Cb related to the electricity bill is obtained (step S102). Also in this case, it is possible to set a charge database based on a charge setting of an electric power company or the like in advance and use this charge database to obtain an electricity charge. In this way, if the information Cb related to the electricity bill is included as the conversion information, the information Cb related to the electricity bill can be grasped in addition to the grasp of the power amount Po. Can be increased. In particular, when combined with information Ca related to carbon dioxide emissions, the awareness and effective reduction of carbon dioxide emissions can be further enhanced by recognizing both the familiar problems on the site side and those not so familiar. A synergistic effect can be expected.

  Further, the amount of change with respect to the previous time (60 minutes before) is calculated, and information Cd related to the amount of change is obtained. The fluctuation amount of the power amount Po can be obtained by subtracting the current power amount from the previous power amount (step S103). The obtained fluctuation amount is further converted into the carbon dioxide emission amount and the electricity bill, respectively (steps S104 and S105). In this case, the carbon dioxide emission amount and the electricity charge may be obtained by subtracting the current carbon dioxide emission amount and the electricity charge from the previous carbon dioxide emission amount and the electricity charge, respectively. Thus, if the information Cd related to the fluctuation amount with respect to the past information is included as the conversion information, the information Cd related to the fluctuation amount can be grasped in addition to the current power amount Po. Increase and decrease over time of Po can be easily and accurately grasped.

  On the other hand, in the molding machine controller 41, management processing is performed for the obtained power amount Po, information Ca related to carbon dioxide emission, information Cb related to electricity charges, and information Cd related to these fluctuation amounts (step). S11). As the management process, for example, an abnormality process or a registration process can be performed. In this case, in the abnormal process, the power amount Po and its fluctuation amount can be monitored, and when the absolute amount or fluctuation amount (relative amount) becomes abnormally large or small, notification can be immediately given by an alarm. In the registration process, the obtained data can be registered in the memory 41m to construct a database.

  Further, a display process for displaying the obtained power amount Po and / or conversion information Ca... On the dedicated display screen Vs is performed (step S12). In this case, as shown in FIG. 3, the power amount Po is displayed on the power amount display unit 67, the information Ca related to the carbon dioxide emission amount is displayed on the carbon dioxide emission display unit 68, and the information Cb related to the electricity bill is displayed on the electric charge display unit. 69, information Cd related to the fluctuation amount of the electric energy Po with respect to the previous time is displayed on the electric energy fluctuation amount display unit 70, and information Cd related to the fluctuation amount of the carbon dioxide emission amount Ca with respect to the previous time is displayed. Information Cd related to the fluctuation amount of the electricity charge Cb with respect to the previous time is displayed on the display part 71 on the electricity charge fluctuation amount display part 72, respectively. Further, the power amount Po and / or the conversion information Ca... Are displayed in a time series as a bar graph by the first graph display unit 73, and the variation rate of the power amount Po and / or the conversion information Ca. 74 is displayed as a bar.

  By the way, although the above display mode is the display of the current data, the display switching unit 64 can switch the display of the current data to the display of the predicted data and display the information Cc related to the prediction. This display method will be described with reference to FIG. Now, in FIG. 3, it is assumed that the current data is displayed (step S31). In this display mode, when the user wants to know the predicted data, the user can arbitrarily switch to the predicted data display mode (step S32). In this case, first, a prediction period is selected (designated) (step S33). FIG. 3 shows a state where 1 [day] is selected. By selecting the prediction period, the molding machine controller 41 calculates prediction data based on the selected prediction period (step S34). In the example, the predicted power amount is the power amount Po × 24. The same calculation is performed on other information Ca. Therefore, if the prediction key 64f is selected, the prediction data when 1 [day] has elapsed from the present time is displayed on each of the display units 67 to 72 (steps S35 and S36). Note that when returning to the current data display mode, the current key 64p may be selected (designated). If not selected, the mode automatically returns to the current data display mode after a predetermined time has elapsed. In this way, if the information Cc related to the future prediction is included as the conversion information, in addition to grasping the current power amount Po, it is possible to grasp in advance the power amount in the future, the carbon dioxide emission amount, etc. Necessary measures can be taken at an earlier stage, such as the molding conditions can be changed at an earlier stage.

  The display process for one designated detection time Tc has been described above. However, when the operation state of the injection molding machine M continues, the same display process is repeated, and if the next designated detection time Tc is reached, The display is updated sequentially (step S13).

  As described above, according to the control device 1 according to the present embodiment, the predetermined conversion information Ca, Cb... Is obtained from the power amount Po at the arbitrarily designated designated detection time Tc, and the obtained conversion information Ca. Since it can be displayed together with the amount Po, in addition to the display of the power amount Po, the display of various conversion information Ca, Cb... Allows the operation state of the injection molding machine M to be sufficiently grasped, and the determination on the operation state. The response (measure) associated with this can be performed accurately, and as a result, it can contribute effectively to the prevention of global warming and resource saving.

  Next, a modified example of the control device 1 according to the present embodiment will be described with reference to FIGS.

  The modification examples shown in FIGS. 7 and 8 use information obtained based on the conversion database B of the power consumption with respect to the change amount of the molding condition when the molding condition is changed as the information Cc related to the future prediction. Is. FIG. 8 shows an example of the conversion database B. This figure shows a change characteristic of the power consumption [kWh] with respect to the mold clamping force [kN], and this change characteristic is set as a conversion database B (conversion table).

  On the other hand, the conversion process is performed according to the procedure shown in FIG. Now, it is assumed that molding is performed under the molding conditions before the change (step S41). In this state, it is assumed that the user views the dedicated display screen Vs and decides that the power consumption is to be reduced a little from a comprehensive point of view, and changes the molding conditions. In this case, for example, if the mold clamping force is changed from 400 [kN] (100 [%]) to 320 [kN] (80 [%]), the corresponding power consumption [kWh] from the conversion database B shown in FIG. Is read (steps S42 and S43). Next, necessary conversion processing and display processing are performed on the read power consumption. In the case of the example, since a reduction effect of power consumption of 0.025 [kWh] is obtained by changing the mold clamping force, the read 0.025 [kWh] corresponds to the designated detection time Tc of the dedicated display screen Vs. It is converted into carbon dioxide emissions and electricity charges. That is, conversion processing is performed as information Cc related to future prediction (step S44). Next, the converted information C is displayed on the corresponding power amount variation display unit 70 on the dedicated display screen Vs (step S45). In this modification example, there is an advantage that more appropriate changes can be made at an early stage, such as how much change can be achieved when changing the molding conditions.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the detailed configuration, quantity, numerical value, and the like are within the scope not departing from the gist of the present invention. It can be changed, added, or deleted arbitrarily.

  For example, the power consumption Wo during operation is a concept that includes not only power consumption during molding (during normal operation) but also power consumption during non-molding such as a preparation stage. Further, as the power consumption Wo, the power consumption Wm related to the electric motor 11 and the power consumption Wh related to the electric heaters 12... Are used. Further, as the conversion information Ca..., Information Ca related to carbon dioxide emissions, information Cb related to electricity charges, information Cc related to future prediction, and information Cd related to fluctuation amounts with respect to past information are exemplified. It does not exclude information. On the other hand, although the mold clamping force is mentioned as the molding condition in the power consumption conversion database B, the conversion database related to other molding conditions such as injection pressure and heating temperature can be set in the same manner as the conversion database B. Further, the designated detection time Tc may be set according to the time or may be set as N hours from the start of operation. Further, although the case where the obtained data is registered in the memory 41m has been shown, it can be printed out or outputted to a communication line as necessary. In the case of an electric injection molding machine equipped with a plurality of electric motors, the power consumption of each electric motor is detected and processed.

  The control device according to the present invention can be used when detecting the power consumption related to the electric motor, and can be used for various injection molding machines including a hydraulic injection molding machine and an electric injection molding machine, as well as other industrial machines. Can be used as well.

  DESCRIPTION OF SYMBOLS 1: Control apparatus, 2: Power consumption detection means, 3: Electric energy calculation means, 4: Conversion information calculation means, 5: Information display means, 11: Electric motor, 12: Electric heater, 34: Rotary encoder, Wm: Consumption Electricity, Wh: Power consumption, M: Injection molding machine, Po: Electricity amount, Ca: Conversion information (information related to carbon dioxide emission), Cb: Conversion information (information related to electricity charges), Cc: Conversion information (future) Information relating to the prediction of information), Cd: conversion information (information relating to the amount of variation with respect to past information), B: conversion database

Claims (8)

A power consumption detecting means for detecting power consumption during operation including power consumption related to the electric motor, a power amount calculating means for obtaining a power amount at a designated detection time arbitrarily designated from the detected power consumption, and displaying the power amount In a control apparatus for an injection molding machine equipped with possible information display means, the power consumption Wm related to the electric motor, the output torque and rotational speed, which are the machine output of the electric motor, and the motor efficiency, servo amplifier efficiency and power factor Is the arithmetic expression used.
Wm = (2π × Tm × Rm) × (ηa × ηb × ηc) / 60
Tm: Output torque [Nm]
Rm: Rotational speed [rpm]
ηa: motor efficiency
ηb: servo amplifier efficiency
A control device for an injection molding machine, comprising power consumption detection means obtained by ηc: power factor.   The control apparatus for an injection molding machine according to claim 1, wherein the output torque is obtained from a current flowing through the electric motor.   2. The control device for an injection molding machine according to claim 1, wherein the rotational speed is detected by a rotary encoder attached to the electric motor. 4. The control apparatus for an injection molding machine according to claim 1, wherein the power consumption Wm related to the electric motor is obtained by the following arithmetic expression.
Wm = (2π × Tm × Rm) × 0.729 / 60   The control apparatus for an injection molding machine according to claim 1, wherein the power consumption during operation includes power consumption related to an electric heater.   Conversion information calculation means for obtaining one or more predetermined conversion information from the electric energy obtained from the electric energy calculation means, and information capable of displaying the obtained one or two or more conversion information together with the electric energy The control apparatus for an injection molding machine according to claim 1, further comprising a display means.   The conversion information includes one or more of information relating to carbon dioxide emissions, information relating to electricity charges, information relating to future prediction, and information relating to fluctuations relative to past information. Item 7. An injection molding machine control device according to Item 6.   8. The injection molding according to claim 7, wherein the information relating to the future prediction includes information obtained based on a conversion database of power consumption with respect to a change amount of the molding condition when the molding condition is changed. Machine control device.

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