JP2013078935A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an unnecessary alarm or the like while properly monitoring mold thickness adjustment by using a sensor.SOLUTION: The injection molding machine includes: a frame; a first fixing member to which a fixed mold is mounted; a second fixing member arranged oppositely to the first fixing member and through which a center rod penetrates; a first movable member to which a movable mold is mounted; a second movable member connected with the first movable member by the center rod; a mold thickness adjustment mechanism for moving the center rod relative to the second movable member; a sensor for acquiring information indicating the position relation between the center rod and the frame; and a control device that outputs an alarm when predetermined alarm-output conditions based on the detection result of the sensor are satisfied. The control device suppresses an alarm when predetermined conditions are satisfied.

Description

  The present invention relates to an injection molding machine including an electromagnet that drives a mold clamping operation.

  2. Description of the Related Art Conventionally, in an injection molding machine, resin is injected from an injection nozzle of an injection device, filled into a cavity space between a fixed mold and a movable mold, and solidified to obtain a molded product. ing. A mold clamping device is provided to move the movable mold relative to the fixed mold to perform mold closing, mold clamping, and mold opening.

  The mold clamping device includes a hydraulic mold clamping device that is driven by supplying oil to a hydraulic cylinder, and an electric mold clamping device that is driven by an electric motor. It is widely used because it has high controllability, does not pollute the surroundings, and has high energy efficiency. In this case, by driving the electric motor, the ball screw is rotated to generate a thrust, and the thrust is expanded by a toggle mechanism to generate a large mold clamping force.

  However, since the electric type mold clamping device having the configuration uses a toggle mechanism, it is difficult to change the mold clamping force due to the characteristics of the toggle mechanism, and the responsiveness and stability are improved. Unfortunately, the clamping force cannot be controlled during molding. Therefore, a mold clamping device is provided in which the thrust generated by the ball screw can be directly used as a mold clamping force. In this case, since the torque of the electric motor and the mold clamping force are proportional, the mold clamping force can be controlled during molding.

  However, in the conventional mold clamping device, the load resistance of the ball screw is low, and not only a large mold clamping force cannot be generated, but also the mold clamping force fluctuates due to torque ripple generated in the electric motor. In addition, in order to generate the mold clamping force, it is necessary to constantly supply current to the motor, and the power consumption and heat generation amount of the motor increase. Therefore, it is necessary to increase the rated output of the motor by that amount. The cost of the device becomes high.

  Therefore, a mold clamping device using a linear motor for the mold opening / closing operation and utilizing the attractive force of an electromagnet for the mold clamping operation is conceivable (for example, Patent Document 1).

WO05 / 090052 pamphlet

  By the way, in the configuration using the mold clamping device using the attractive force of the electromagnet as described in Patent Document 1, as in the toggle type configuration, for example, in order to cope with the change in the thickness of the mold device, A mold thickness adjusting mechanism is provided. In order to prevent the mold thickness adjustment from being performed when the mold thickness adjustment exceeds the upper limit value or the lower limit value, it is useful to provide a sensor on the frame or the like and monitor the position of the center rod with respect to the frame.

  However, such a sensor may react with the movement of the center rod during the mold opening / closing operation and cause an unnecessary alarm.

  Accordingly, an object of the present invention is to provide an injection molding machine capable of suppressing unnecessary alarms and the like while appropriately monitoring mold thickness adjustment using a sensor.

To achieve the above object, according to one aspect of the present invention, a frame;
A first fixing member to which a fixed mold is attached;
A second fixing member disposed opposite to the first fixing member and through which a center rod penetrates;
A first movable member to which a movable mold is attached;
A second movable member that is connected to the first movable member by the center rod and moves together with the first movable member, and that cooperates with the second fixed member and is formed by an attractive force of an electromagnet. A second movable member constituting a mold clamping force generating mechanism for generating a clamping force;
A mold thickness adjusting mechanism that adjusts a distance between the first movable member and the second movable member by moving the center rod with respect to the second movable member;
A sensor for acquiring information representing a positional relationship between the center rod and the frame;
A control device that outputs an alarm when a predetermined alarm output condition based on a detection result of the sensor is satisfied;
With
An injection molding machine is provided, wherein the control device is configured to suppress the alarm when a predetermined condition is satisfied.

  ADVANTAGE OF THE INVENTION According to this invention, the injection molding machine which can suppress an unnecessary alarm etc. can be obtained, monitoring mold thickness adjustment appropriately using a sensor.

It is a figure which shows the state at the time of the mold closing of the mold clamping apparatus in the injection molding machine of embodiment of this invention. It is a figure which shows the state at the time of the mold opening of the mold clamping apparatus in the injection molding machine of embodiment of this invention. 5 is a cross-sectional view showing an example of a mold thickness adjusting mechanism 44. FIG. 7 is a flowchart showing an example of main control executed by a mold thickness adjustment monitoring unit 63.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the present embodiment, for the mold clamping device, the moving direction of the movable platen when closing the mold is the front, the moving direction of the movable platen when opening the mold is the rear, and the injection device is the injection The description will be made assuming that the moving direction of the screw when performing the measurement is the front and the moving direction of the screw when performing the measurement is the rear.

  FIG. 1 is a diagram showing a state when a mold clamping device is closed in an injection molding machine according to an embodiment of the present invention, and FIG. 2 is a state when the mold clamping device is opened in the injection molding machine according to the embodiment of the present invention. FIG. In FIGS. 1 and 2, the hatched members show the main cross section.

  In the figure, 10 is a mold clamping device, Fr is a frame (frame) of an injection molding machine, Gd is a guide movable with respect to the frame Fr, 11 is a guide not shown or fixed on the frame Fr. A rear platen 13 is disposed at a predetermined distance from the fixed platen 11 and opposed to the fixed platen 11, and four tie bars 14 (in the figure) are disposed between the fixed platen 11 and the rear platen 13. Shows only two of the four tie bars 14). The rear platen 13 is fixed with respect to the frame Fr.

  A screw portion (not shown) is formed at the front end portion (right end portion in the figure) of the tie bar 14, and the front end portion of the tie bar 14 is fixed to the fixed platen 11 by screwing and tightening the nut n1 to the screw portion. Is done. The rear end of the tie bar 14 is fixed to the rear platen 13.

  A movable platen 12 is disposed along the tie bar 14 so as to face the fixed platen 11 so as to be movable back and forth in the mold opening / closing direction. For this purpose, the movable platen 12 is fixed to the guide Gd, and a guide hole or notch (not shown) for penetrating the tie bar 14 is formed at a position corresponding to the tie bar 14 in the movable platen 12. A suction plate 22 described later is also fixed to the guide Gd. As shown in the figure, the guide Gd may be provided separately for each of the suction plate 22 and the movable platen 12, or may be configured by a single unit common to the suction plate 22 and the movable platen 12. .

  A fixed mold 15 is fixed to the fixed platen 11 and a movable mold 16 is fixed to the movable platen 12. The fixed mold 15 and the movable mold 16 are brought into contact with and separated from each other as the movable platen 12 advances and retreats. Then, mold closing, mold clamping and mold opening are performed. As the mold clamping is performed, a cavity space (not shown) is formed between the fixed mold 15 and the movable mold 16, and resin (not shown) injected from the injection nozzle 18 of the injection device 17 is formed in the cavity space. Is charged. A mold device 19 is configured by the fixed mold 15 and the movable mold 16.

  The suction plate 22 is fixed to the guide Gd in parallel with the movable platen 12. As a result, the suction plate 22 can move forward and backward behind the rear platen 13. The suction plate 22 may be formed of a magnetic material. For example, the suction plate 22 may be configured by an electromagnetic laminated steel plate formed by laminating thin plates made of a ferromagnetic material. Alternatively, the suction plate 22 may be formed by casting.

  The linear motor 28 is provided on the guide Gd in order to advance and retract the movable platen 12. The linear motor 28 includes a stator 29 and a mover 31, and the stator 29 is formed on the frame Fr in parallel with the guide Gd and corresponding to the moving range of the movable platen 12. Is formed at a lower end of the movable platen 12 so as to face the stator 29 and over a predetermined range.

  The mover 31 includes a core 34 and a coil 35. The core 34 includes a plurality of magnetic pole teeth 33 that are protruded toward the stator 29 and formed at a predetermined pitch, and the coil 35 is wound around each magnetic pole tooth 33. The magnetic pole teeth 33 are formed in parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. The stator 29 includes a core (not shown) and a permanent magnet (not shown) formed to extend on the core. The permanent magnet is formed by alternately magnetizing the N and S poles. When the linear motor 28 is driven by supplying a predetermined current to the coil 35, the movable element 31 is advanced and retracted, and accordingly, the movable platen 12 is advanced and retracted by the guide Gd to perform mold closing and mold opening. it can.

  In the present embodiment, the permanent magnet is disposed on the stator 29 and the coil 35 is disposed on the mover 31, but the coil is disposed on the stator and the permanent magnet is disposed on the mover. You can also. In this case, since the coil does not move as the linear motor 28 is driven, wiring for supplying power to the coil can be easily performed.

  The movable platen 12 and the suction plate 22 are not limited to be fixed to the guide Gd, and a movable element 31 of the linear motor 28 may be provided on the movable platen 12 or the suction plate 22. Further, the mold opening / closing mechanism is not limited to the linear motor 28, and may be a hydraulic type or an electric type.

  When the movable platen 12 is moved forward and the movable mold 16 abuts against the fixed mold 15, the mold is closed and subsequently the mold is clamped. An electromagnet unit 37 for clamping the mold is disposed between the rear platen 13 and the suction plate 22. A center rod 39 that extends through the rear platen 13 and the suction plate 22 and connects the movable platen 12 and the suction plate 22 is disposed so as to freely advance and retract. The center rod 39 advances and retracts the attracting plate 22 in conjunction with the advance and retreat of the movable platen 12 when the mold is closed and opened, and transmits the attracting force generated by the electromagnet unit 37 to the movable platen 12 when the mold is clamped. To do.

  The fixed platen 11, the movable platen 12, the rear platen 13, the suction plate 22, the linear motor 28, the electromagnet unit 37, the center rod 39, and the like constitute the mold clamping device 10.

  The electromagnet unit 37 includes an electromagnet 49 formed on the rear platen 13 side and a suction portion 51 formed on the suction plate 22 side. Further, a predetermined portion of the rear end surface of the rear platen 13, in this embodiment, a groove 45 is formed around the center rod 39, a core 46 is formed inside the groove 45, and a yoke 47 is formed outside the groove 45. Is done. A coil 48 is wound around the core 46 in the groove 45. The core 46 and the yoke 47 are formed of an integral casting structure, but may be formed by laminating thin plates made of a ferromagnetic material to form an electromagnetic laminated steel plate.

  In the present embodiment, the electromagnet 49 may be formed separately from the rear platen 13, and the adsorbing portion 51 may be formed separately from the adsorption plate 22, or the electromagnet may be adsorbed as a part of the rear platen 13 and adsorbed as a part of the adsorption plate 22. A part may be formed. Further, the arrangement of the electromagnet and the attracting part may be reversed. For example, the electromagnet 49 may be provided on the suction plate 22 side, and the suction portion may be provided on the rear platen 13 side.

  When an electric current is supplied to the coil 48 in the electromagnet unit 37, the electromagnet 49 is driven to attract the attracting part 51 and generate a mold clamping force.

  The center rod 39 is connected to the suction plate 22 at the rear end and is connected to the movable platen 12 at the front end. Therefore, the center rod 39 is advanced together with the movable platen 12 when the mold is closed to advance the suction plate 22, and is retracted together with the movable platen 12 when the mold is opened to retract the suction plate 22. For this purpose, a hole 41 through which the center rod 39 passes is formed in the central portion of the rear platen 13.

  The driving of the linear motor 28 and the electromagnet 49 of the mold clamping device 10 is controlled by the control unit 60. The control unit 60 includes a CPU, a memory, and the like, and also includes a circuit for supplying current to the coil 35 of the linear motor 28 and the coil 48 of the electromagnet 49 according to the result calculated by the CPU. A load detector 55 is also connected to the control unit 60. The load detector 55 is installed at a predetermined position (a predetermined position between the fixed platen 11 and the rear platen 13) of at least one tie bar 14 in the mold clamping device 10, and detects a load applied to the tie bar 14. . In the drawing, an example in which a load detector 55 is installed on two upper and lower tie bars 14 is shown. The load detector 55 is constituted by, for example, a sensor that detects the extension amount of the tie bar 14. The load (strain) detected by the load detector 55 is sent to the control unit 60. The controller 60 detects the mold clamping force based on the output of the load detector 55. Note that the control unit 60 is omitted for the sake of convenience in FIG.

  Next, the operation of the mold clamping device 10 will be described.

  The mold closing process is controlled by the mold opening / closing processor 61 of the controller 60. In the state of FIG. 2 (the state at the time of mold opening), the mold opening / closing processor 61 supplies current to the coil 35. Subsequently, the linear motor 28 is driven, the movable platen 12 is advanced, and the movable mold 16 is brought into contact with the fixed mold 15 as shown in FIG. At this time, a gap δ is formed between the rear platen 13 and the suction plate 22, that is, between the electromagnet 49 and the suction portion 51. Note that the force required for mold closing is sufficiently reduced compared to the mold clamping force.

  Subsequently, the mold clamping processing unit 62 of the control unit 60 controls the mold clamping process. The mold clamping unit 62 supplies current to the coil 48 and attracts the attracting unit 51 by the attracting force of the electromagnet 49. Along with this, the clamping force is transmitted to the movable platen 12 through the suction plate 22 and the center rod 39, and clamping is performed. When changing the clamping force such as at the start of clamping, the clamping unit 62 generates a target clamping force to be obtained by the change, that is, a target clamping force in a steady state. Control is performed so that the necessary steady-state current value is supplied to the coil 48.

  The mold clamping force is detected by the load detector 55. The detected mold clamping force is sent to the control unit 60, where the current supplied to the coil 48 is adjusted so that the mold clamping force becomes a set value, and feedback control is performed. During this time, the resin melted in the injection device 17 is injected from the injection nozzle 18 and filled into the cavity space of the mold device 19.

  When the resin in the cavity space is cooled and solidified, the mold opening / closing processor 61 controls the mold opening process. The mold clamping processing unit 62 stops the supply of current to the coil 48 in the state of FIG. Along with this, the linear motor 28 is driven, the movable platen 12 is moved backward, and the movable mold 16 is placed in the retracted limit position as shown in FIG.

  Next, a configuration related to mold thickness adjustment will be described.

  A mold thickness adjusting mechanism 44 is provided on the rear side of the suction plate 22. The mold thickness adjusting mechanism 44 is a mechanism that adjusts the relative position of the movable platen 12 and the suction plate 22 (that is, the distance between them) in accordance with the thickness of the mold apparatus 19. The configuration itself of the mold thickness adjusting mechanism 44 may be arbitrary. For example, the mold thickness adjusting mechanism 44 varies the position of the center rod 39 with respect to the suction plate 22 by a mold thickness adjusting motor (not shown). Thereby, the position of the center rod 39 with respect to the suction plate 22 is adjusted, and the position of the movable platen 12 with respect to the fixed platen 11 is adjusted. That is, the mold thickness is adjusted by changing the relative positions of the movable platen 12 and the suction plate 22.

  FIG. 3 is a cross-sectional view showing an example of the mold thickness adjusting mechanism 44. In the example shown in FIG. 3, the nut pressing member 44 b of the mold thickness adjusting mechanism 44 is fastened behind the suction plate 22. The nut pressing member 44 b holds a nut 44 a that meshes with a screw (not shown) formed on the peripheral surface of the center rod 39. The mold thickness adjustment may be executed with the suction plate 22 held in position. The position holding of the suction plate 22 may be realized by the control of the linear motor 28 or may be realized by being mechanically locked. The mold thickness adjusting mechanism 44 varies the position of the center rod 39 with respect to the suction plate 22 by rotating a gear 44c coupled to the nut 44a by a mold thickness adjusting motor (not shown). Thereby, the position of the center rod 39 with respect to the suction plate 22 is adjusted, the position of the movable platen 12 with respect to the fixed platen 11 is adjusted, and the mold thickness is adjusted. As a premise, during the molding process, the mold thickness adjusting motor is not operated, and the position of the center rod 39 with respect to the suction plate 22 is basically not changed (that is, the adjusted state is maintained).

  Referring back to FIGS. 1 and 2, sensors 92 and 94 that detect the position of the center rod 39 are provided on the frame Fr. When the rear end of the center rod 39 comes in front of the first reference position Y1 of the frame Fr (the side closer to the fixed platen 11), the sensor 92 detects that fact (hereinafter referred to as a first detection signal). Is generated. When the rear end of the center rod 39 comes behind the second reference position Y2 of the frame Fr, the sensor 94 generates a detection signal to that effect (hereinafter referred to as a second detection signal). The first reference position Y1 and the second reference position Y2 correspond to the limit value of the mold thickness adjustment range by the mold thickness adjusting mechanism 44. That is, the first reference position Y1 and the second reference position Y2 respectively correspond to the positions of the rear end of the center rod 39 when the lower limit value and the upper limit value of the mold thickness adjustment range are realized. The first reference position Y1 and the second reference position Y2 corresponding to the limit value of the mold thickness adjustment range are the positions of the suction plate 22 (for example, the distance between the rear platen 13 and the suction plate 22) when performing mold thickness adjustment. Therefore, it may be determined based on the position of the suction plate 22 when performing mold thickness adjustment. Accordingly, the positions of the sensors 92 and 94 may be determined based on the position of the suction plate 22 when performing mold thickness adjustment.

  The sensors 92 and 94 may detect the position of the center rod 39 by an arbitrary system such as a magnetic system, an optical system, or a mechanical system. For example, the sensors 92 and 94 are optical, emit light toward the center rod 39 in the vertical plane at each of the first reference position Y1 and the second reference position Y2, and receive the reflected light or the passing light. The position of the center rod 39 may be detected based on the presence or absence. For example, when the center rod 39 is located behind the first reference position Y1, the sensor 92 receives reflected light (or does not receive transmitted light), and the center rod 39 is ahead of the first reference position Y1. When in position, sensor 92 does not receive reflected light (or receives transmitted light). In this case, the sensor 92 outputs the first detection signal while not receiving the reflected light (or receiving the transmitted light). Similarly, when the center rod 39 is located behind the second reference position Y2, the sensor 94 receives the reflected light (or does not receive the transmitted light), and the center rod 39 is less than the second reference position Y2. When positioned forward, sensor 94 does not receive reflected light (or receives transmitted light). In this case, the sensor 94 outputs the second detection signal while receiving the reflected light (or not receiving the transmitted light).

  The mold thickness adjustment may be performed in a state where the gap δ is maintained between the rear platen 13 and the suction plate 22 (see FIG. 1). In the state shown in FIG. 1, since the rear end of the center rod 39 is located between the first reference position Y1 and the second reference position Y2, the mold thickness adjustment is realized within the mold thickness adjustment range.

  Next, the operation of the mold thickness adjustment monitoring unit 63 of the control unit 60 will be described.

  FIG. 4 is a flowchart showing an example of main control executed by the mold thickness adjustment monitoring unit 63. The processing routine shown in FIG. 4 may be repeatedly executed at predetermined intervals while the injection molding machine is operating (power is on). The output signals of the sensors 92 and 94 are input to the mold thickness adjustment monitoring unit 63 of the control unit 60.

  In step 400, it is determined whether or not a predetermined alarm-off condition is satisfied. The predetermined alarm-off condition is a condition for turning off an alarm (see step 406) based on signals from sensors 92 and 94 described later. The predetermined alarm-off condition is set so that an alarm based on signals from sensors 92 and 94, which will be described later, is an alarm that should be performed at the time of mold thickness adjustment, so that no alarm is output during other work or operation. May be. For example, the predetermined alarm-off condition may be a condition that is satisfied when mold thickness adjustment is not performed. In this case, whether or not the mold thickness adjustment is performed may be determined based on the presence or absence of a control signal at the time of mold thickness adjustment (for example, the presence or absence of a drive signal to the mold thickness adjustment motor). Alternatively, the predetermined alarm-off condition may be a condition that is satisfied when an alarm-off instruction is input from the user. The alarm-off instruction from the user may be input to the control unit 60 via an arbitrary user interface (for example, an on / off button). In this case, for example, when performing mold thickness adjustment, the user may input an alarm-on instruction via the user interface.

  Alternatively, the predetermined alarm-off condition may be a condition that is satisfied when the suction plate 22 is moving. Whether or not the suction plate 22 is moving may be determined based on a control signal of the control unit 60 (that is, whether or not a drive signal corresponding to the movement command is applied to the linear motor 28), or suction. The determination may be made based on an output signal of a linear encoder that detects the position of the plate 22. The various conditions described above may be used in combination as OR conditions.

  In this step 400, when a predetermined alarm-off condition is satisfied, the process is finished as it is. In this case, the process of step 406 described later is not executed, and therefore an alarm based on signals from sensors 92 and 94 described later is not output. On the other hand, if the predetermined alarm-off condition is not satisfied, the process proceeds to step 402.

  In step 402, it is determined whether or not the first detection signal is generated, that is, whether or not the first detection signal is input from the sensor 92. If the first detection signal is generated, the process proceeds to step 406. If the first detection signal is not generated, the process proceeds to step 404.

  In step 404, it is determined whether or not the second detection signal is generated, that is, whether or not the second detection signal is input from the sensor 94. If the second detection signal is generated, the process proceeds to step 406. On the other hand, if the second detection signal is not generated, the process ends. In this case, the process of step 406 described later is not executed, and therefore an alarm based on signals from sensors 92 and 94 described later is not output.

  In step 406, an alarm is output. The alarm is an alarm for transmitting to the user that the mold thickness adjustment has been performed beyond the mold thickness adjustment range, and may be executed in any form such as sound or display. For example, the alarm may be output by a buzzer or a message. In addition to the alarm, the driving of the mold thickness adjusting motor may be forcibly stopped if necessary.

  As described above, according to the processing shown in FIG. 4, when a predetermined alarm-off condition is satisfied, even if the first or second detection signal is output from the sensor 92 or 94, an alarm is generated. There is no output. Thereby, an unnecessary alarm can be appropriately prevented by appropriately setting a predetermined alarm off condition. For example, when the mold opening is performed in the molding process, the center rod 39 may come behind the second reference position Y2 as shown in FIG. In such a case, an unnecessary alarm is output with the generation of the second detection signal from the sensor 94. Further, for example, when the mold thickness is adjusted to the limit of the lower limit value of the mold thickness adjustment range and the mold is closed in the molding process, the center rod 39 is positioned forward of the first reference position Y1 depending on the control accuracy. May come in. In such a case, an unnecessary alarm is output with the generation of the first detection signal from the sensor 92. On the other hand, for example, when a condition that is satisfied when the mold thickness adjustment is not being performed or a condition that is satisfied when the suction plate 22 is moving is used as the predetermined alarm-off condition, such an unnecessary alarm is generated. It can be prevented appropriately.

  In the process shown in FIG. 4, the alarm output is turned off by not responding to the first and second detection signals from the sensors 92 and 94. However, when a predetermined alarm-off condition is satisfied, the sensor 92 , 94 itself may be turned off to turn off the alarm output. That is, the operation and power supply of the sensors 92 and 94 may be turned off. Alternatively, when a predetermined alarm-off condition is satisfied, the output of the alarm may be turned off by blocking the signal line between the sensors 92 and 94 and the control unit 60 with a switch or the like.

  In the embodiment described above, the “first fixed member” in the claims corresponds to the fixed platen 11, and the “first movable member” in the claims corresponds to the movable platen 12. . The “second fixing member” in the claims corresponds to the rear platen 13, and the “second movable member” in the claims corresponds to the suction plate 22. Further, the “first sensor” in the claims corresponds to the sensor 92, and the “second sensor” in the claims corresponds to the sensor 94.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, the sensors 92 and 94 may be set at arbitrary positions as long as the position of the center rod 39 with respect to the first reference position Y1 and the second reference position Y2 of the frame Fr can be detected. For example, the sensors 92 and 94 may be provided on the rear platen 13 fixed to the frame Fr. In the above-described embodiment, the presence / absence of passage of the rear end of the center rod 39 with respect to the first reference position Y1 and the second reference position Y2 is detected by the sensors 92 and 94. The presence or absence of passage of a predetermined part other than the rear end of 39 may be detected. In this case, a marker-like feature may be given to a predetermined portion other than the rear end of the center rod 39. In this case, the first reference position Y1 and the second reference position Y2 correspond to the respective positions of the predetermined portion of the center rod 39 when the lower limit value and the upper limit value of the mold thickness adjustment range are realized. In this case, the sensors 92 and 94 output a first detection signal and a second detection signal when a marker at a predetermined portion of the center rod 39 is detected. That is, when the first predetermined portion of the center rod 39 reaches the first reference position Y1, the sensor 92 detects the marker of the first predetermined portion of the center rod 39 and outputs a first detection signal. When the second predetermined portion of 39 reaches the second reference position Y2, the sensor 94 detects a marker of the second predetermined portion of the center rod 39 and outputs a second detection signal.

  Further, in the above description, the mold clamping device 10 having a specific configuration is illustrated, but the mold clamping device 10 may have any configuration that performs mold clamping using an electromagnet.

Fr frame Gd guide 10 mold clamping device 11 fixed platen 12 movable platen 13 rear platen 14 tie bar 15 fixed mold 16 movable mold 17 injection device 18 injection nozzle 19 mold device 22 suction plate 28 linear motor 29 stator 31 mover 33 magnetic pole Teeth 34 Core 35 Coil 37 Electromagnet unit 39 Center rod 41 Hole 44 Mold thickness adjusting mechanism 45 Groove 46 Core 47 Yoke 48 Coil 49 Electromagnet 51 Adsorption part 55 Load detector 60 Control part 61 Type opening / closing processing part 62 Mold clamping part 63 type Thickness adjustment monitoring unit 92, 94 sensor Y1 first reference position Y2 second reference position

Claims (5)

Frame,
A first fixing member to which a fixed mold is attached;
A second fixing member disposed opposite to the first fixing member and through which a center rod penetrates;
A first movable member to which a movable mold is attached;
A second movable member that is connected to the first movable member by the center rod and moves together with the first movable member, and that cooperates with the second fixed member and is formed by an attractive force of an electromagnet. A second movable member constituting a mold clamping force generating mechanism for generating a clamping force;
A mold thickness adjusting mechanism that adjusts a distance between the first movable member and the second movable member by moving the center rod with respect to the second movable member;
A sensor for acquiring information representing a positional relationship between the center rod and the frame;
A control device that outputs an alarm when a predetermined alarm output condition based on a detection result of the sensor is satisfied;
With
The said control apparatus is comprised so that the said warning may be suppressed when predetermined conditions are satisfy | filled, The injection molding machine characterized by the above-mentioned. A first sensor that generates a first detection signal to that effect when the center rod moving in the mold closing direction reaches or exceeds the first reference position of the frame; And, when the center rod moving in the mold opening direction reaches or exceeds the second reference position of the frame, at least one of the second sensors that generates a second detection signal to that effect Including either
The injection molding machine according to claim 1, wherein the predetermined alarm output condition is satisfied when the first detection signal or the second detection signal is generated. When the center rod comes closer to the first fixing member than the first reference position of the frame in the mold closing direction, the sensor generates a first detection signal to that effect; And, in the mold opening direction, when the center rod comes closer to the side away from the first fixing member than the second reference position of the frame, at least one of the second sensors that generates a second detection signal to that effect Including either
The injection molding machine according to claim 1, wherein the predetermined alarm output condition is satisfied when the first detection signal or the second detection signal is generated.   The injection molding machine according to any one of claims 1 to 3, wherein the control device suppresses the alarm when the second movable member is moving.   The injection molding machine according to any one of claims 1 to 3, wherein the control device suppresses the alarm when the mold thickness adjusting mechanism is not operating.

Images