TWI454365B - Energy saving control device and machine or injection molding machine carring with the energy saving control device - Google Patents

Description

Energy-saving control device, and machine or injection molding machine carrying the province's energy control device

The present invention relates to an energy saving control device provided in a machine including a hydraulic circuit such as an injection molding machine, and a machine or an injection molding machine in which the energy saving control device is mounted, and more particularly to an oil pressure circuit. The energy-saving control device of the machine and the machine or injection molding machine carrying the energy-saving control device are provided.

For example, a representative device of a machine having a hydraulic circuit has an injection molding machine. In recent years, an air-pressure type or a pure-mechanical injection molding machine has been proposed. However, the oil pressure type is most suitable as an injection molding machine in consideration of the pressure required for the injection molding machine.

A machine with such a hydraulic circuit is a very energy-intensive machine, so energy saving has become an urgent need.

However, in order to renovate a machine equipped with a hydraulic machine to save energy, various problems exist. For example, an injection molding machine which is one of the machines including a hydraulic press is taken as an example, and the injection molding machine is manufactured by many manufacturers. In addition, even for the same manufacturer, the hydraulic circuit is different as long as the model is different. Furthermore, in recent years, injection molding machines have been controlled by computer control, but the contents of the program cannot be grasped. Therefore, the circuit of the injection molding machine is also difficult to modify.

Therefore, there is a problem that it is difficult to save energy for the existing equipment having the hydraulic circuit.

The present invention has been made in order to solve the above problems, and an object of the invention is to provide an energy-saving control device that can save energy for a built-in device having a hydraulic circuit, and a machine or an injection molding machine that carries the energy-saving control device.

The energy saving control device of the present invention includes: a solenoid operating detection unit connected to at least one electromagnetic coil for changing a valve flowing in a hydraulic oil circulation direction of the hydraulic circuit for detecting at least one of the The operating state of the electromagnetic coil; the motor revolution number determining unit determines the number of revolutions of the motor for driving the hydraulic pump to the hydraulic circuit of the hydraulic circuit based on the detection result of the electromagnetic coil operation detecting unit; and the number of motor revolutions The control unit is connected in series between the motor and the power supply source, and is configured to control the number of revolutions of the motor to achieve the number of revolutions determined by the motor revolution number determining unit; and to provide the hydraulic circuit of the device or supply the operating oil to The machine is equipped with oil pressure equipment for energy saving controllers.

In the present invention, the electromagnetic coil operation detecting unit detects the operating state of the electromagnetic coil of the electromagnetic valve. Thereby, the operating state of the hydraulic actuator controlled by the solenoid valve can be recognized. Further, the motor revolution number determining unit determines the number of revolutions of the motor based on the detection result of the electromagnetic coil operation detecting unit, and the number of revolutions of the motor is controlled by the motor number of revolutions control unit to achieve the number of revolutions. Thereby, the number of revolutions of the motor can be controlled to a preferred number of revolutions corresponding to the operating state of the machine. Therefore, by attaching the energy-saving control device of the present invention to the hydraulic circuit of the existing machine or supplying the hydraulic oil to the existing hydraulic device of the machine, even if the manufacturer has a different or unknown program, the hydraulic circuit can be provided. It also saves energy in the machine.

In the following embodiments, the case where the present invention is carried out by an injection molding machine which is a machine having a hydraulic circuit will be described.

(Embodiment 1)

Fig. 1 is a view showing a configuration of an example of a conventional injection molding machine. Fig. 2 is a timing chart showing the operation of the injection molding machine. In addition, FIG. 3 is a block diagram showing an energy saving control device according to Embodiment 1 of the present invention. Figure 4 is a block diagram showing the electromagnetic coil motion sensor of the energy saving control device of the province. Hereinafter, in order to make the present invention easy to understand, a conventional injection molding machine (Figs. 1 and 2) will be described first. Next, the energy saving control device of the first embodiment will be described.

As shown in Fig. 1, the injection molding machine 1 is composed of a mold clamping unit 10, an injection unit 20, a hydraulic circuit 30, and the like.

The mold clamping portion 10 is composed of a die plate 11, a die plate 12, a die bar 13, a mold cylinder 14, and the like. The template 11 is a fixed plate formed with an insertion hole 11a. The convex portion of the metal mold 17 is inserted into the insertion hole 11a, and the metal mold 17 is attached to the template 11. In this template 11, a plurality of branch mold bars 13 are provided. The template 11 is fixed to the right end of the guide bar 13.

At the left end of these guide bars 13, a lock cylinder 14 is provided. The rod portion of the mold clamping cylinder 14 is connected to the die plate 12 via a link mechanism 15. This template 12 is a plate for mounting the metal mold 16 and is guided by the guide bar 13. In other words, when the rod portion of the mode cylinder 14 is extended, the template 12 is moved to the side of the template 11 while being guided by the guide bar 13.

The mold clamping unit 10 is composed of an injection cylinder 21, a heating cylinder 22, a hopper 23, a screw 24, a nozzle portion 25, an insertion cylinder 26, and the like. A feed screw 24 is attached to the rod portion of the injection cylinder 21. Further, the casing of the injection cylinder 21 is integrally formed with a heating cylinder 22 so as to cover the feed screw 24, for example. At the front end of the heating cylinder 22, a nozzle portion 25 is formed. The rod portion of the injection cylinder 21 is also connected to the hydraulic motor 46, and by rotating the hydraulic motor 46, the feed screw 24 also rotates.

A hopper 23 for supplying the resin for injection to the heating cylinder 22 is provided in the heating cylinder 22. The resin in the hopper 23 is moved in the direction of the nozzle portion 25 in the heating cylinder 22 by the rotation of the feed screw 24. During this movement, the resin is heated by the heating cylinder 22 to plasticize it.

The injection cylinder 21, the heating cylinder 22, the hopper 23, the feed screw 24, and the nozzle unit 25 are moved in the left-right direction by being inserted into the cylinder 26. In other words, when the rod portion of the insertion cylinder 26 is contracted, the nozzle portion 25 is inserted into the mold 17 of the die plate 11. When the rod portion of the insertion cylinder 26 is extended, the nozzle portion 25 is taken out from the metal mold 17 of the die plate 11.

The hydraulic actuators such as the lock cylinder 14, the injection cylinder 21, the insertion cylinder 26, and the hydraulic motor 46 are operated by the hydraulic circuit 30 to supply the hydraulic oil. The hydraulic circuit 30 is composed of a hydraulic pump 31, a solenoid valve 32, a solenoid valve 34, a solenoid valve 35, a solenoid valve 41, a solenoid valve 42, and a solenoid valve 44. The hydraulic pump 31 is for transmitting the hydraulic oil supplied to each hydraulic actuator to the hydraulic circuit 30. This hydraulic pump is driven by an induction motor 60 (as shown in Figure 3). The capacity of the hydraulic pump 31 is a capacity for simultaneously operating the hydraulic actuators such as the lock cylinder 14, the injection cylinder 21, the insertion cylinder 26, and the hydraulic motor 46. Actually, since these hydraulic actuators do not all operate at the same time, the capacity of the hydraulic motor 46 is larger than the actual required capacity of the injection molding machine 1.

The solenoid valve 32 is used to control the pilot pressure of the unloader valve 33 to lower (unload) the discharge pressure of the hydraulic pump 31, and to minimize unnecessary power consumption and prevent oil temperature. Ascending, the pump life is extended, and the hydraulic pump 31 is unloaded to the operator. In other words, the hydraulic pump 31 can be switched to the load state or the no-load state by the solenoid valve 32. The solenoid valve 34 is for switching the supply of the operating oil to the mode cylinder 14 to the cap side pressure chamber 14a or the head side pressure chamber 14b. The solenoid valve 35 is a start or stop for switching the supply of the operating oil to the head side pressure chamber 14b. The solenoid valve 41 is for switching the supply of the operating oil to the insertion cylinder 26 to the cover side pressure chamber 26a or the head side pressure chamber 26b. The solenoid valve 42 is for switching the supply of the operating oil to the injection cylinder 21 to the cover side pressure chamber 21a or the head side pressure chamber 21b. The solenoid valve 44 is used to switch the start or stop of the supply of the hydraulic oil to the hydraulic motor 46. The solenoid valve 47, the relief valve 48, the release valve 49, and the relief valve 50 are used for the back pressure adjustment of the injection cylinder 21 and the insertion cylinder 26.

(action)

Next, the operation of the injection molding machine 1 will be described using Figs. 1 and 2 . In the following description of the operation, the direction approaching the template 11 (metal mold 17) is referred to as advancement, and the direction away from the template 11 (metal mold 17) is referred to as backward movement. In the operation of the template 12 shown in Fig. 2, the lower side is the forward direction. In the operation of the nozzle unit 25 shown in Fig. 2, the upper side is the forward direction. Further, in the operation of the injection cylinder 21 shown in Fig. 2, the upper side is the advancing direction of the rod portion.

The injection molding machine 1 sequentially passes the resin through the mold closing step, the mold clamping step, the nozzle advance step, the injection step, the injection secondary pressure step (pressure holding step), the nozzle retreating step, the plasticizing-cooling step, and the mold opening step. Product molding.

More specifically, the electromagnetic coil 32a of the solenoid valve 32 is energized to bring the hydraulic pump 31 into a loaded state. Then start the mold closing step. In the mold closing step, the electromagnetic coil 32a of the electromagnetic valve 32, the electromagnetic coil 34a of the electromagnetic valve 34, and the electromagnetic coil 35a of the electromagnetic valve 35 are energized. Thereby, the template 12 is advanced, and the convex portion 16a of the metal mold 16 is inserted into the concave portion 17a of the metal mold 17. After the mold closing step, the mold clamping step is started. In the mold clamping step, the electromagnetic coil 32a of the solenoid valve 32 and the electromagnetic coil 34a of the solenoid valve 34 are energized. Thereby, the metal mold 16 is fixed. In other words, the clamping cylinder 14 is used to maintain the pressure at which the pressure applied to the mold 16 can be withstood during the ejection step. At this time, a gap is formed between the convex portion 16a of the mold 16 and the concave portion 17a of the mold 17.

After the clamping step, the nozzle advancement step is started. In the nozzle advancing step, the electromagnetic coil 32a of the electromagnetic valve 32, the electromagnetic coil 34a of the electromagnetic valve 34, and the electromagnetic coil 41b of the electromagnetic valve 41 are energized. Thereby, the injection cylinder 21, the heating cylinder 22, the hopper 23, the feed screw 24, and the nozzle unit 25 are advanced. Then, the nozzle portion 25 is inserted into the metal mold 17.

After the nozzle advancement step, the injection step is started. In the injection step, the electromagnetic coil 32a of the electromagnetic valve 32, the electromagnetic coil 34a of the electromagnetic valve 34, and the electromagnetic coil 42b of the electromagnetic valve 42 are energized. Thereby, the rod portion of the injection cylinder 21 is advanced. Then, the plasticized resin stored in the front end portion of the heating cylinder 22 is injected between the convex portion 16a of the metal mold 16 and the concave portion 17a of the metal mold 17 through the nozzle portion 25 and the injection hole 17b of the metal mold 17. The void formed.

After the injection step, the second pressure step is initiated. In the second injection step, the electromagnetic coil 32a of the electromagnetic valve 32, the electromagnetic coil 42b of the electromagnetic valve 42, and the electromagnetic coil 47a of the electromagnetic valve 47 are energized. Thereby, the plasticized resin stored at the end portion of the heating cylinder 22 is pressed by the injection cylinder 21 at a predetermined pressure. The resin injected into the gap formed between the convex portion 16a of the metal mold 16 and the concave portion 17a of the metal mold 17 gradually shrinks as it cools. The plasticized resin can be replenished to the constricted portion by pushing the plasticized resin at the front end of the heating cylinder 22 at a predetermined pressure.

After the second pressure step is ejected, the nozzle retreat step is started. In the nozzle retreating step, the electromagnetic coil 32a of the electromagnetic valve 32 and the electromagnetic coil 41a of the electromagnetic valve 41 are energized. Thereby, the injection cylinder 21, the heating cylinder 22, the hopper 23, the feed screw 24, and the nozzle unit 25 are retracted.

After the nozzle retreat step, the plasticization-cooling step begins. In the plasticizing-cooling step, the electromagnetic coil 32a of the electromagnetic valve 32, the electromagnetic coil 47b of the electromagnetic valve 47, and the electromagnetic coil 44a of the electromagnetic valve 44 are energized. Thereby, the rod portion of the injection cylinder 21 is moved backward. Further, the hydraulic motor 46 is driven to rotate the feed screw 24. The resin in the hopper 23 is supplied into the heating cylinder 22 by the rotation of the feed screw 24. Further, the resin supplied into the heating cylinder 22 is heated by the heating cylinder 22 to be plasticized.

On the other hand, the resin injected into the gap formed between the convex portion 16a of the metal mold 16 and the concave portion 17a of the metal mold 17 is cooled during this period.

After the plasticizing-cooling step, the mold opening step is started. In the mold opening step, the electromagnetic coil 32a of the solenoid valve 32 and the electromagnetic coil 34b of the solenoid valve 34 are energized. Thereby, the template 12 is retracted and the metal mold is opened. Further, the molded resin product is pushed from the through hole 16b of the mold 16 by a push-out cylinder (not shown), and is removed from the mold 16.

(provincial energy control device)

Next, the energy saving control device 100 according to the first embodiment will be described with reference to FIGS. 3 and 4.

When the energization of the electromagnetic coil 32a of the solenoid valve 32 is stopped, the injection molding machine 1 can cause the hydraulic pump 31 to be in an unloaded state. Therefore, by making the hydraulic pump 31 into an unloaded state, the injection molding machine 1 can be subjected to energy saving control. However, in the case where the number of revolutions of the induction motor 60 that drives the hydraulic pump 31 is constant, the hydraulic pump 31 is an induction motor 60 having an efficiency of 90 to 95% in a load state, even if the hydraulic pump 31 is in an unloaded state. The efficiency is only about 80%. In other words, even if the hydraulic pump 31 is in an unloaded state, the injection molding machine 1 cannot perform energy saving control.

Therefore, in the first embodiment, the number of revolutions of the induction motor 60 is controlled by the energy saving control device 100, whereby the injection molding machine 1 performs energy saving control.

In the case where the induction motor 60 is driven by an inverter, it is known that the power consumption becomes smaller as the output becomes smaller. Furthermore, the output of the induction motor 60 can be expressed by the following equation.

L=2πT‧N/6120......(1)

Here, L[Kw] represents the output of the induction motor 60, T[kgf‧m] represents the torque of the induction motor 60, and N[min-1] represents the number of revolutions of the induction motor 60.

As described above, when the torque T of the induction motor 60 is constant, the power consumption of the induction motor 60 can be reduced by controlling the number of revolutions of the induction motor 60. In other words, it can be understood that the injection molding machine 1 can perform energy saving control by controlling the induction motor 60 to be sufficient to pressurize the required amount of the engine oil in accordance with the operating state of each of the hydraulic actuators of the injection molding machine 1.

The energy control device 100 of this province is composed of an inverter 101, a controller 110, and the like. Here, the inverter 101 corresponds to the motor rotation number control unit of the present invention.

The controller 110 includes an electromagnetic coil operation detecting unit 111 and a motor rotation number determining unit 112. The electromagnetic coil operation detecting unit 111 is configured to detect the energization state (operation state) of each electromagnetic coil, and to transmit the energization state (operation state) to the motor rotation number determining unit 112. In the first embodiment, the electromagnetic coil operation detecting unit 111 is connected to each electromagnetic coil of the hydraulic circuit 30 via the electromagnetic valve operation sensor 120.

As shown in FIG. 4, the solenoid valve operation sensor 120 is composed of a full-wave rectifier 121, a resistor 122, an isolator 123, and the like (in addition, FIG. 4 shows an electromagnetic connection to the electromagnetic coil 34a). Valve action sensor 120). More specifically, the full-wave rectifier 121 is connected in parallel with the electromagnetic coil 34a. The resistor 122 is provided in a connection wiring between the full-wave rectifier 121 and the electromagnetic coil 34a. The optical isolator 123 is connected to an output terminal of the full-wave rectifier 121. Further, an output terminal of the optical isolator 123 is connected to the electromagnetic coil operation detecting unit 111. In other words, the solenoid valve action sensor 120 converts the operating voltage applied to the electromagnetic coil 34a into a predetermined DC voltage, and applies the DC voltage to the optical isolator 123, thereby transmitting the detection output to the electromagnetic coil motion detecting portion. 111.

The operating voltage of the electromagnetic coil has various voltages. For example, in Japan, for example, it can be roughly classified into DC24V, AC100V, and AC200V. Therefore, when the electromagnetic coil operation detecting unit 111 is directly connected to the electromagnetic coil (or the power supply wiring for the electromagnetic coil), it is necessary to confirm the operating voltage applied to each electromagnetic coil. However, by connecting the electromagnetic coil operation detecting unit 111 to the electromagnetic coil via the solenoid valve operation sensor 120, the operation of confirming the operating voltage applied by each electromagnetic coil can be omitted. Therefore, the connection work of the electromagnetic coil operation detecting unit 111 and the electromagnetic coil becomes easy.

Further, the electromagnetic coil operation detecting unit 111 may of course be directly connected to each electromagnetic coil.

The motor revolution number determining unit 112 determines the number of revolutions of the induction motor 60 based on the energization state (operation state) of each electromagnetic coil detected by the electromagnetic coil operation detecting unit 111. More specifically, the motor rotation number determining unit 112 includes, for example, a memory unit having a form (data) as shown in FIG. 5, and determines the rotation of the induction motor 60 based on the detection result of the form and the electromagnetic coil operation detecting unit 111. number.

Fig. 5 is an example of a form included in the motor revolution number determining unit in the first embodiment of the present invention. This form is the number of the electromagnetic coil that can be input (the circle symbol shown in Fig. 5), and the number of revolutions of the induction motor 60 required for that time. In addition, Fig. 5 shows the ratio of the number of revolutions of the induction motor 60 to the rated number of revolutions.

Here, the form can be made according to various varieties of the molded resin product. This is because, for example, even in the case of molding the same variety (even if the same injection pressure is required), the number of revolutions of the required induction motor differs depending on the manufacturer or model of the injection molding machine. Moreover, even in the injection molding machine of the same model, the injection pressure varies depending on the type. Therefore, the number of revolutions of the required induction motor may vary depending on the type of resin product to be molded.

For example, Fig. 5(1) shows a case where the electromagnetic coil 32a of the electromagnetic valve 32, the electromagnetic coil 34a of the electromagnetic valve 34, and the electromagnetic coil 35a of the electromagnetic valve 35 are in an operating state (in other words, a case where the nozzle advances step). When, for example, 70% is input to the field of the induction motor in Fig. 5 (1), the electromagnetic coil 32a of the electromagnetic valve 32, the electromagnetic coil 34a of the electromagnetic valve 34, and the electromagnetic coil 35a of the electromagnetic valve 35 are in an operating state. The motor revolution number determining unit 112 determines the number of revolutions of the induction motor 60 to be 70% of the rated number of revolutions.

In addition, there are various methods for inputting fields of the form. For example, the same as the form can be created by the user and transmitted to the motor revolution number determining unit 112 (controller 110) or the like. For example, the user can directly input each field of the form in the motor revolution number determining unit 112 (controller 110).

The motor revolution number determining unit 112 that determines the number of revolutions of the induction motor 60 transmits the number of revolutions information to the inverter 101. The inverter 101 is connected in series to a power supply line for connecting the induction motor 60 to a power supply source 62 such as a commercial power source. This inverter 101 converts an AC voltage supplied from the power supply source 62 into a DC voltage. Further, the DC voltage is converted into an AC voltage of a frequency corresponding to the number of revolutions of the induction motor 60 transmitted from the motor rotation number determining unit 112, and supplied to the induction motor 60. Thereby, the induction motor 60 is driven by the number of revolutions determined by the motor revolution number determining unit 112.

Moreover, the control unit 61 shown in FIG. 3 is a control unit of the injection molding machine 1.

In the energy saving control device 100 configured in this manner, the electromagnetic coil operation detecting unit 111 detects the operating state of the electromagnetic coil of each electromagnetic valve. Thereby, the operating state of the hydraulic actuator controlled by each electromagnetic coil can be recognized. Further, the motor revolution number determining unit 112 determines the number of revolutions of the induction motor 60 based on the detection result of the electromagnetic coil operation detecting unit 111, and controls the number of revolutions of the induction motor 60 by the inverter 101 to become the number of revolutions. Thereby, the number of revolutions of the induction motor 60 can be controlled to a preferred number of revolutions corresponding to the operating state of the injection molding machine 1. Therefore, by attaching the energy-saving control device 100 to the hydraulic circuit 30 in which the injection molding machine 1 is provided, the energy saving of the injection molding machine 1 can be achieved even if the manufacturer has a different or unknown program.

Further, the electromagnetic coil operation detecting unit 111 includes the electromagnetic valve operation sensor 120, in other words, since the electromagnetic coil operation detecting unit 111 is connected to the electromagnetic coil via the electromagnetic valve operation sensor 120, the electromagnetic coil operation detecting unit 111 The connection work with the electromagnetic coil becomes easy.

The form (figure 5) included in the motor revolution number determining unit 112 is merely an example. For example, a form in which the number of revolutions of the induction motor 60 is input may be input for each electromagnetic coil number. Furthermore, when a plurality of electromagnetic coils are operated, the number of revolutions of the induction motor numbers of the respective electromagnetic coils may be summed to determine the number of revolutions of the induction motor 60.

Further, in the first embodiment, the present invention is applied to the injection molding machine 1 having the hydraulic pump 31 in the hydraulic circuit 30, but it is of course possible to implement the present invention in the hydraulic circuit without the hydraulic pump. The injection molding machine. In other words, in the injection molding machine in which the hydraulic circuit does not have the hydraulic pump, the hydraulic oil is pumped from a hydraulic device (pump station) provided with a hydraulic pump or the like. By using the energy saving control device 100 to control the number of revolutions of the induction motor that drives the hydraulic pump of the hydraulic device, energy saving control can be performed in an injection molding machine in which the hydraulic circuit does not have a hydraulic pump.

Further, in the first embodiment, the electromagnetic coil operation detecting unit 111 is connected to all the electromagnetic coils in the hydraulic circuit 30, but the electromagnetic coil operation detecting unit 111 may be connected to one of the hydraulic circuits 30. Electromagnetic coils. The electromagnetic coil that is not connected to the electromagnetic coil operation detecting unit 111 determines the number of revolutions of the induction motor 60 as long as it is assumed to be always operating. As long as the operating state of the solenoid valve for controlling the hydraulic actuator that requires a large amount of operating oil is detected, the energy saving of the injection molding machine 1 can be achieved.

(Embodiment 2)

In the first embodiment, the present invention is applied to the injection molding machine 1 that drives the hydraulic pump 31 by the induction motor 60. However, the present invention is not limited thereto, and it is of course possible to implement the injection molding machine 1 that drives the hydraulic pump 31 by an electric motor other than the induction motor 60. In the second embodiment, the matters that are not specifically described are the same as those in the first embodiment, and the same functions or configurations are denoted by the same reference numerals.

Fig. 6 is a view showing the configuration of an energy saving control device according to a second embodiment of the present invention. In the sixth drawing, the energy saving control device 100 is connected to the injection molding machine 1 that drives the hydraulic pump 31 by the servo motor 63. Therefore, the servo amplifier 102 is used as the motor revolution number control unit. Further, the number of revolutions of the servo motor 63 is controlled by the servo amplifier 102 so that the number of revolutions of the servo motor 63 becomes the number of revolutions determined by the motor revolution number determining unit 112.

Thus, the present invention can be implemented by using a motor revolution number control unit corresponding to the type of the motor that drives the hydraulic pump 31.

As described above, in the first embodiment and the second embodiment, the case where the present invention is applied to the injection molding machine 1 has been described. However, it is needless to say that the present invention can be applied to another device including a hydraulic circuit (for example, a press). .

1. . . Injection molding machine

10. . . Molding department

11,12. . . template

11a. . . Insertion hole

13. . . Guide bar

14. . . Clamping cylinder

14a, 21a, 26a. . . Cover side pressure chamber

14b, 21b, 26b. . . Head side pressure chamber

15. . . Linkage

16, 17. . . Metal mold

16a. . . Convex

16b. . . Through hole

17a. . . Concave

17b. . . Injection hole

20. . . Injection department

twenty one. . . Injection cylinder

twenty two. . . Heating cylinder

twenty three. . . Feeding hopper

twenty four. . . Feed screw

25. . . Nozzle section

26. . . Insertion cylinder

30. . . Hydraulic circuit

31. . . Hydraulic pump

32, 34, 35, 41, 42, 42a, 44, 47. . . The electromagnetic valve

32a, 34a, 34b, 35a, 41a, 41b, 42b, 44a, 47a, 47b. . . Electromagnetic coil

33. . . Unloading valve

46. . . Hydraulic motor

48, 49, 50. . . Release valve

60. . . Induction motor

61. . . Control department

62. . . Power supply

63. . . Servo motor

100. . . Energy saving control device

101. . . Inverter

110. . . Controller

111. . . Electromagnetic coil motion detecting unit

112. . . Motor revolution number determination unit

120. . . Solenoid valve action sensor

121. . . Full wave rectifier

122. . . Resistor

123. . . Optical isolator

Fig. 1 is a view showing a configuration of an example of a conventional injection molding machine.

Fig. 2 is a timing chart showing the operation of the injection molding machine of Fig. 1.

Fig. 3 is a view showing the configuration of the energy saving control device of the first embodiment.

Fig. 4 is a view showing the configuration of an electromagnetic coil operation sensor showing the energy saving control device of the first embodiment.

Fig. 5 is an example of a form included in the motor revolution number determining unit of the first embodiment.

Fig. 6 is a view showing the configuration of the energy saving control device of the second embodiment.

31. . . Hydraulic pump

32a, 34a, 34b. . . Electromagnetic coil

60. . . Induction motor

61. . . Control department

62. . . Power supply

100. . . Energy saving control device

101. . . Inverter

110. . . Controller

111. . . Electromagnetic coil motion detecting unit

112. . . Motor revolution number determination unit

120. . . Solenoid valve action sensor

Claims (8)

An energy-saving control device characterized by comprising: an electromagnetic coil operation detecting unit connected to at least one electromagnetic coil for changing a valve flowing in a flow direction of a hydraulic oil flowing through a hydraulic circuit for detecting at least one electromagnetic The operation state of the coil; the motor rotation number determining unit determines the number of revolutions of the motor for driving the hydraulic oil to the hydraulic pump of the hydraulic circuit based on the detection result of the electromagnetic coil operation detecting unit; and the motor rotation number control a portion connected in series between the motor and the power supply source to control the number of revolutions of the motor to be the number of revolutions determined by the motor revolution number determining unit; and to provide the hydraulic circuit of the device or to supply the operating oil to the motor The machine is equipped with oil pressure equipment for energy saving control. The energy-saving control device according to the first aspect of the invention, wherein the electromagnetic coil operation detecting unit has a solenoid valve action sensor, wherein the solenoid valve action sensor comprises: a full-wave rectifier connected in parallel to the electromagnetic coil And a resistor disposed between the electromagnetic coil and the full-wave rectifier; and an isolator coupled to the output terminal of the full-wave rectifier. The energy saving control device according to claim 1 or 2, wherein the electric motor is an induction motor; and the motor rotation number control unit is an inverter. The energy saving control device according to claim 1 or 2, wherein the motor is a servo motor, and the motor number control unit is a servo amplifier. The energy-saving control device according to the first or second aspect of the invention, wherein the motor revolution number determining unit has a memory unit that memorizes the number of revolutions of the motor corresponding to an operating state of the electromagnetic coil as data. The number of revolutions of the motor is determined based on the data of the memory unit and the detection result of the electromagnetic coil operation detecting unit. An energy-saving control device according to the first or second aspect of the patent application, wherein the machine having the hydraulic circuit is an injection molding machine. A machine having a hydraulic circuit and carrying an energy-saving control device according to any one of claims 1 to 5. An injection molding machine comprising a hydraulic circuit and carrying the energy saving control device according to any one of the first to fifth aspects of the patent application.