KR101327247B1 - Injection molding machine - Google Patents

Abstract

[Problem] Unnecessary alarms are suppressed while monitoring the mold thickness adjustment appropriately using a sensor.
[Method] The injection molding machine is provided with a frame, a first fixing member on which the fixed mold is mounted, a first fixing member on which the mold is mounted, a second fixing member through which the center rod passes, and a first movable on which the movable mold is mounted. The member, a second movable member connected to the first movable member and the center rod, a mold thickness adjusting mechanism for moving the center rod relative to the second movable member, and a sensor for acquiring information indicating a positional relationship between the center rod and the frame. And a control device for outputting an alarm when the predetermined alarm output condition based on the detection result of the sensor is satisfied, and the control device suppresses the alarm when the predetermined condition is satisfied.

Description

Injection molding machine

This application claims the priority based on Japanese Patent Application No. 2012-168488 for which it applied on July 30, 2012. The entire contents of that application are incorporated by reference in this specification.

The present invention relates to an injection molding machine having an electromagnet for driving a mold clamping operation.

Conventionally, in an injection molding machine, a resin is injected from an injection nozzle of an injection apparatus, filled in a cavity space between a stationary mold and a movable mold, and solidified to obtain a molded article. Then, a mold clamping apparatus is provided for moving the movable mold relative to the stationary mold to perform mold closing, mold clamping and mold opening.

The mold clamping apparatus includes a hydraulic type mold clamping apparatus driven by supplying oil to a hydraulic cylinder and an electric mold clamping apparatus driven by an electric motor. And is also widely used because of its high energy efficiency. In this case, a thrust is generated by rotating the ball screw by driving the electric motor, and the thrust is enlarged by the toggle mechanism to generate a large mold clamping force.

By the way, in the electric clamping device of such a structure, since a toggle mechanism is used, it is difficult to change a clamping force by the characteristic of the toggle mechanism, and it is difficult to control a clamping force during shaping | molding because of poor response and stability. Therefore, there is provided a mold clamping device capable of directly using a thrust generated by a ball screw as a mold clamping force. In this case, since the torque of the electric motor and the clamping force are proportional, the clamping force can be controlled during molding.

However, in the conventional mold clamping apparatus, the ball screw has low resistance to load and can not generate a large mold clamping force, and the mold clamping force fluctuates due to the torque ripple generated in the motor. Further, in order to generate the mold clamping force, it is necessary to always supply the electric current to the electric motor, so that the electric power consumption and the heat generation amount of the electric motor become large, so that the rated output of the electric motor needs to be increased as much as possible and the cost of the mold clamping apparatus becomes high.

Therefore, a mold clamping apparatus using a linear motor for mold opening / closing operation and an attraction force of electromagnet for mold clamping operation is designed (for example, Patent Document 1).

WO 05/090052 Pamphlet

By the way, in the structure using the clamping device using the electromagnet adsorption force of patent document 1, the mold thickness adjustment mechanism is formed so that it can respond to the change of the thickness of a mold apparatus similarly to a toggle type structure, for example. When adjusting the mold thickness, it is useful to install a sensor in a frame or the like to monitor the position of the center rod with respect to the frame so that the mold thickness adjustment is not performed beyond the upper limit value or the lower limit value.

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

Therefore, an object of the present invention is to provide an injection molding machine which can suppress an unnecessary alarm or the like while appropriately monitoring mold thickness adjustment using a sensor.

In order to achieve the above object, according to one aspect of the present invention,

A first fixing member on which the stationary mold is mounted,

A second fixing member installed to face the first fixing member and through which a center rod passes;

A first movable member on which the movable mold is mounted,

A second movable member connected to the first movable member and the center rod to move together with the first movable member, which cooperates with the second fixing member to form a clamp force generating mechanism for generating a clamp force by suction force by an electromagnet. A second movable member,

A mold thickness adjusting mechanism for adjusting the distance between the first movable member and the second movable member by moving the center rod relative to the second movable member;

A sensor for acquiring information indicating a positional relationship between the center rod and the frame;

A control device for outputting an alarm when a predetermined alarm output condition based on a detection result of the sensor is satisfied,

The control device is provided with an injection molding machine, which is configured to suppress the alarm when a predetermined condition is satisfied.

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

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a mold clamping apparatus in a mold closing apparatus in an injection molding machine according to an embodiment of the present invention. Fig.
Fig. 2 is a view showing the mold-starting state of the mold-clamping apparatus in the injection molding machine according to the embodiment of the present invention.
3 is a cross-sectional view showing an example of the mold thickness adjusting mechanism 44.
4 is a flowchart showing an example of main control executed by the mold thickness adjustment monitoring unit 63.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. However, in the present embodiment, the moving direction of the movable platen when mold closing is referred to as the forward direction and the moving direction of the movable platen when the mold opening is performed is referred to as the rear direction, The moving direction of the screw at the time of injection is referred to as forward and the direction of movement of the screw at the time of metering is referred to as rear.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a state of a mold clamping apparatus in an injection molding machine according to an embodiment of the present invention, and FIG. 2 is a view showing a mold starting state of a mold clamping apparatus in an injection molding machine according to an embodiment of the present invention . 1 and 2, the hatched member shows a main cross section.

In the drawing, reference numeral 10 denotes a clamping apparatus, Fr denotes a frame (temporary frame) of an injection molding machine, Gd denotes a guide that is movable relative to the frame Fr, and 11 denotes a guide image or frame Fr that is not shown. ) Is a stationary platen mounted on the platen), and the rear platen 13 is disposed at a predetermined interval from the stationary platen 11 and facing the stationary platen 11. Four tie bars 14 (only two of the four tie bars 14 are shown in the drawing) are hypothesized between the stationary platen 11 and the rear platen 13. However, the rear platen 13 is fixed with respect to the frame Fr.

A threaded portion (not shown) is formed at the front end (right end in the drawing) of the tie bar 14, and the nut n1 is screwed to the threaded portion to tighten the tie bar 14 The front end portion is fixed to the stationary platen 11. The rear end portion of the tie bar 14 is fixed to the rear platen 13.

The movable platen 12 is arranged so as to be able to move forward and backward in the mold opening / closing direction so as to face the fixed platen 11 along the tie bar 14. [ Thereby, the movable platen 12 is fixed to the guide Gd and a guide (not shown) for penetrating the tie bar 14 at a position corresponding to the tie bar 14 in the movable platen 12 A blank or a cutout portion is formed. However, the suction plate 22, which will be described later, is also fixed to the guide Gd. As shown in the drawing, the guide Gd may be provided separately for each of the suction plate 22 and the movable platen 12, and the guide Gd may be formed by a common integrated body with respect to the suction plate 22 and the movable platen 12. It may be configured.

The fixed platen 11 is fixed to the fixed platen 15 and the movable platen 12 is fixed to the movable platen 12. The movable platen 12 is movable relative to the stationary mold 15 The mold 16 is contacted and separated, and mold closing, mold clamping, and mold clamping are performed. However, as the mold is carried out, a cavity space (not shown) is formed between the stationary mold 15 and the movable mold 16, and is not shown from the injection nozzle 18 of the injection apparatus 17. Resin is filled into the cavity space. The mold apparatus 19 is constituted by the stationary mold 15 and the movable mold 16.

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

The linear motor 28 is installed in the guide Gd to move the movable platen 12 forward and backward. The linear motor 28 includes a stator 29 and a mover 31. The stator 29 is mounted on the frame Fr in parallel with the guide Gd and on the movable platen 12 and the mover 31 is formed to face the stator 29 at the lower end of the movable platen 12 and over a predetermined range.

The mover (31) has a core (34) and a coil (35). The core 34 is provided with a plurality of magnetic pole teeth 33 protruding toward the stator 29 at a predetermined pitch and the coils 35 are wound around the magnetic pole teeth 33, Lt; / RTI > However, the stimulating teeth 33 are formed parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. [ Further, the stator 29 has a core (not shown) and a permanent magnet (not shown) formed on the core. The permanent magnet is formed by alternately magnetizing the magnetic poles of the N pole and the S pole. When the linear motor 28 is driven by supplying a predetermined current to the coil 35, the mover 31 is retracted, whereby the movable platen 12 is retracted by the guide Gd, and mold closing and You can perform a sentence.

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

The movable platen 12 or the attracting plate 22 is not limited to the structure in which the movable platen 12 and the attracting plate 22 are fixed to the guide Gd. As shown in Fig. In addition, the type of opening / closing device is not limited to the linear motor 28 but may be a hydraulic type or an electric type.

When the movable platen 12 is advanced and the movable mold 16 contacts the stationary mold 15, mold closing is performed, and then mold molding is performed. An electromagnet unit (37) is provided between the rear platen (13) and the attracting plate (22). A rod 39 extending through the rear platen 13 and the attracting plate 22 and connecting the movable platen 12 and the attracting plate 22 is provided so as to be movable forward and backward. The center rod 39 moves and retracts the attracting plate 22 in conjunction with the advancing and retreating movement of the movable platen 12 at the time of mold closing and mold starting to move the attracting force generated by the electromagnet unit 37 To the platen (12).

It should be noted that the mold clamping device 11 may be formed by the stationary platen 11, the movable platen 12, the rear platen 13, the attracting plate 22, the linear motor 28, the electromagnet unit 37, 10).

The electromagnet unit 37 is composed of an electromagnet 49 formed on the rear platen 13 side and an adsorption section 51 formed on the adsorption plate 22 side. A groove 45 is formed around the central rod 39 in the predetermined section of the rear end surface of the rear platen 13 in this embodiment and the core 46 is provided on the inner side of the groove 45, A yoke 47 is formed on the outer side of the groove 45. Then, the coil 48 is wound around the core 46 in the groove 45. In addition, although the core 46 and the yoke 47 are comprised by the integral structure of a casting, they may be formed by laminating | stacking the thin plate which consists of ferromagnetic bodies, and may comprise an electronic laminated steel sheet.

In this embodiment, the electromagnet 49 may be formed separately from the rear platen 13, and the adsorption portion 51 may be formed separately from the adsorption plate 22. The electromagnet 49 may be formed as a part of the rear platen 13, The adsorption section may be formed as a part of the adsorption plate 22. The arrangement of the electromagnet and the attracting portion may be reversed. For example, an electromagnet 49 may be provided on the suction plate 22 side and a suction portion may be provided on the rear platen 13 side.

In the electromagnet unit 37, when an electric current is supplied to the coil 48, the electromagnet 49 is driven, and the attracting portion 51 is attracted to generate a mold clamping force.

The center rod 39 is connected to the attracting plate 22 at the rear end and connected to the movable platen 12 at the front end. Thus, the center rod 39 is advanced together with the movable platen 12 to advance the attracting plate 22 when the mold is closed, and retracted together with the movable platen 12 to retract the attracting plate 22 at the mold start . Thereby, in the central portion of the rear platen 13, a hole 41 for penetrating the center rod 39 is formed.

The driving of the linear motor 28 and the electromagnet 49 of the mold clamping apparatus 10 is controlled by the control section 60. [ The control unit 60 includes a CPU and a memory and includes a circuit diagram for supplying current to the coil 35 of the linear motor 28 and the coil 48 of the electromagnet 49 in accordance with the result calculated by the CPU Respectively. A load detector 55 is also connected to the control unit 60. [ The load detector 55 detects the load of the tie bar 14 at a predetermined position (a predetermined position between the stationary platen 11 and the rear platen 13) of the at least one tie bar 14 in the mold- And detects a load applied to the tie bar 14. In the figure, an example in which the load detector 55 is provided on the upper and lower tie bars 14 is shown. The load detector 55 is constituted by, for example, a sensor for detecting the amount of elongation of the tie bars 14. The load (deformation) detected by the load detector 55 is sent to the control unit 60. The control unit (60) detects the mold clamping force based on the output of the load detector (55). However, the control unit 60 is omitted in FIG. 2 for the sake of convenience.

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

The mold closing process is controlled by the mold opening / closing processing unit 61 of the control unit 60. 2, the mold opening / closing processing unit 61 supplies a current to the coil 35. In the state shown in Fig. Then, the linear motor 28 is driven, the movable platen 12 is advanced, and the movable mold 16 is brought into contact with the stationary mold 15 as shown in Fig. At this time, a gap delta is formed between the rear platen 13 and the attracting plate 22, that is, between the electromagnet 49 and the attracting portion 51. [ However, the force required for mold closing is sufficiently small as compared with the mold clamping force.

Then, the mold-clamping processing section 62 of the control section 60 controls the mold-clamping process. The mold clamping processing unit 62 supplies current to the coil 48 to suck the attracting unit 51 by the attracting force of the electromagnet 49. [ Thus, the mold-clamping force is transmitted to the movable platen 12 through the attracting plate 22 and the center rod 39, and mold-clamping is performed. When the mold clamping force is changed, for example, at the start of the mold clamping process, the mold clamping process unit 62 determines whether the mold clamping force necessary for generating the target mold clamping force in the normal (steady) So that the value of the current is supplied to the coil 48.

However, the mold clamping force is detected by the load detector 55. The detected mold clamping force is sent to the control unit 60. In the control unit 60, the current supplied to the coil 48 is adjusted so that the mold clamping force becomes the set value, and the feedback control is performed. In the meantime, molten resin is injected from the injection nozzle 18 in the injection apparatus 17, and is filled in the cavity of the mold apparatus 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. As a result, the linear motor 28 is driven, the movable platen 12 is retracted, and as shown in FIG. 2, the movable mold 16 is placed at the retreat limit position, and mold opening is performed.

Next, the structure related to mold thickness adjustment is demonstrated.

On the rear side of the suction plate 22, a mold thickness adjusting mechanism 44 is provided. The mold thickness adjusting mechanism 44 is a mechanism for adjusting the relative position (that is, the distance between them) of the movable platen 12 and the suction plate 22 in correspondence with the thickness of the mold apparatus 19. The structure 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 stationary 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.

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 44b of the mold thickness adjusting mechanism 44 is fastened behind the suction plate 22. The nut press member 44b supports the nut 44a which meshes with the screw (not shown) formed in the circumferential surface of the center rod 39. The mold thickness adjustment may be performed while the suction plate 22 is held in position. The position maintenance of the suction plate 22 may be realized by the control of the linear motor 28, or may be realized by mechanically locking. The mold thickness adjusting mechanism 44 varies the position of the center rod 39 with respect to the suction plate 22 by rotating the 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 stationary platen 11 is adjusted, and the mold thickness is adjusted. However, as a premise, during the molding process, the mold thickness adjusting motor does not operate, and the position of the center rod 39 with respect to the suction plate 22 does not basically change (that is, the adjusted state is maintained).

Referring again to FIG. 1 and FIG. 2, sensors 92 and 94 for detecting the position of the center rod 39 are provided in the frame Fr. When the rear end of the center rod 39 comes to the front (side closer to the fixed platen 11) than the first reference position Y1 of the frame Fr, the sensor 92 Hereinafter, referred to as a first detection signal). 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 (hereinafter referred to as a second detection signal) for that purpose. . The first reference position Y1 and the second reference position Y2 correspond to the limits 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 respective 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 limits of the mold thickness adjustment range are positioned at the position of the suction plate 22 (for example, the rear platen 13 and the suction plate) when the mold thickness is adjusted. 22), and may be determined based on the position of the suction plate 22 at the time of adjusting the mold thickness. Therefore, each position of the sensors 92 and 94 may be determined based on the position of the suction plate 22 at the time of performing the mold thickness adjustment.

The sensors 92 and 94 may detect the position of the center rod 39 in any manner such as magnetic, optical or mechanical. 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, The position of the center rod 39 may be detected based on the presence or absence of the reception of the reflected or passed light. For example, when the center rod 39 is located behind the first reference position Y1, the sensor 92 receives the reflected light (or does not receive the pass light), and the center rod 39 receives the first reference. When located ahead of the position Y1, the sensor 92 does not receive the reflected light (or receives the passing light). In this case, the sensor 92 outputs the first detection signal while not receiving reflected light (or receiving passing 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 pass light), and the center rod 39 receives the second reference. When located ahead of the position Y2, the sensor 94 does not receive reflected light (or receives passing light). In this case, the sensor 94 outputs the second detection signal while receiving the reflected light (or not receiving the pass light).

However, 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. do.

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

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 during the operation of the injection molding machine (during power supply 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 the predetermined alarm OFF condition is satisfied. The predetermined alarm OFF condition is a condition for turning off the alarm (see step 406) based on the signals from the sensors 92 and 94 described later. The predetermined alarm OFF condition is that the alarm based on the signals from the sensors 92 and 94, which will be described later, is an alarm to be performed at the time of the mold thickness adjustment. It may be set so that it may not be. For example, the predetermined alarm OFF condition may be a condition that is satisfied when the 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 adjusting motor). Alternatively, the predetermined alarm OFF condition may be a condition that is satisfied when an alarm OFF instruction from a user is input. The alarm OFF instruction from the user may be input to the control unit 60 through any user interface (for example, the ON / OFF button). In this case, the user may input the alarm ON instruction through the user interface, for example, when adjusting the mold thickness.

Alternatively, the predetermined alarm OFF condition may be a condition that is established when the suction plate 22 is moving. Whether the suction plate 22 is moving or not may be determined based on the control signal of the control unit 60 (that is, whether or not the driving signal corresponding to the movement command is applied to the linear motor 28), and the suction plate 22 is used. May be determined based on the output signal of the linear encoder for detecting the position of " However, the various conditions mentioned above may be used in combination as an OR condition.

In this step 400, when the predetermined alarm OFF condition is satisfied, the process ends as it is. In this case, the process of step 406 mentioned later is not performed and therefore, the alarm based on the signal from the sensors 92 and 94 mentioned 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 has been generated, that is, whether or not the first detection signal has been input from the sensor 92. If the first detection signal has occurred, the flow proceeds to step 406. If the first detection signal has not been generated, the process proceeds to step 404.

In step 404, it is determined whether or not the second detection signal has been generated, that is, whether or not the second detection signal is input from the sensor 94. If the second detection signal has occurred, the flow proceeds to step 406. On the other hand, when the second detection signal does not occur, the process is terminated as it is. In this case, the process of step 406 mentioned later is not performed and therefore, the alarm based on the signal from the sensors 92 and 94 mentioned later is not output.

In step 406, an alarm is output. The alarm is an alarm for notifying the user that the mold thickness adjustment is being performed beyond the mold thickness adjusting range, and may be executed in any form such as a sound or a display. For example, the alarm may be output by a buzzer or a message. However, the drive of the mold thickness adjustment motor may be forcibly stopped as necessary with an alarm.

Thus, according to the process shown in FIG. 4, when a predetermined alarm OFF condition is satisfied, even if the 1st or 2nd detection signal is output from the sensor 92 or 94, an alarm will not be output. Thereby, unnecessary alarm can be prevented appropriately by setting a predetermined | prescribed alarm OFF condition suitably. For example, when mold opening is performed in the molding step, the center rod 39 may come behind the second reference position Y2 as shown in FIG. 2. In such a case, unnecessary alarm is output in accordance with the generation of the second detection signal from the sensor 94. When the mold closing is performed in the molding step by adjusting to the mold thickness immediately before the lower limit of the mold thickness adjusting range, for example, the center rod 39 is moved forward of the first reference position Y1 depending on the control accuracy. There may be occasions when it comes to. In such a case, unnecessary alarm is output in accordance with the generation of the first detection signal from the sensor 92. On the other hand, if a predetermined alarm OFF condition is used, for example, a condition that is established when the mold thickness adjustment is not being performed and a condition that is established when the adsorption plate 22 is moving, such unnecessary alarm can be properly prevented. .

In the processing 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 established, the sensor ( 92, 94) by turning itself off, the alarm output may be turned off. That is, the operation of the sensors 92 and 94 and the power supply may be turned off. Alternatively, when a predetermined alarm off condition is established, the alarm output may be turned off by cutting off a signal line between the sensors 92 and 94 and the controller 60 with a switch or the like.

However, in the above-described embodiment, the "first fixing member" in the claims corresponds to the fixed platen 11, and the "first movable member" in the claims is the movable plate (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. [ The "first sensor" in the claims corresponds to the sensor 92, and the "second sensor" in the claims corresponds to the sensor 94.

As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the above-mentioned embodiment, A various deformation | transformation and substitution to the above-mentioned embodiment are not deviated from the range of this invention. Can be added.

For example, the sensors 92 and 94 may be moved to any position as long as they can detect 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. It may be set. For example, the sensors 92 and 94 may be provided in the rear platen 13 fixed to the frame Fr. In addition, in the above-mentioned embodiment, although the presence or absence of the passage to the 1st reference position Y1 and the 2nd reference position Y2 of the rear end of the center rod 39 is detected by the sensors 92 and 94, The sensors 92 and 94 may detect the presence or absence of passage of predetermined portions other than the rear end of the center rod 39. In this case, the predetermined portion other than the rear end of the center rod 39 may be provided with the same characteristics as the marker. In this case, however, the first reference position Y1 and the second reference position Y2 are respectively positioned at predetermined positions of the center rod 39 when the lower limit value and the upper limit value of the mold thickness adjustment range are realized. Corresponds. In this case, the sensors 92 and 94 output the first detection signal and the second detection signal at the time when the marker of the 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 a marker of the first predetermined portion of the center rod 39 and outputs a first detection signal. When the second predetermined portion of the center rod 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. do.

In addition, although the clamping apparatus 10 of a specific structure is illustrated in the above-mentioned description, the clamping apparatus 10 may be arbitrary structures which perform molding using an electromagnet.

Fr frame
Gd Guide
10-shaped device
11 stationary platen
12 operation platens
13 Rear Platen
14 Tie bars
15 stationary mold
16 Operation mold
17 Injection device
18 Injection nozzle
19 Mold equipment
22 suction plate
28 Linear Motors
29 Stator
31 mover
33 magnetic poles (齒)
34 cores
35 coils
37 electromagnet unit
39 center rod
41 holes
44 type thickness adjusting mechanism
45 Home
46 cores
47 York
48 coils
49 Electromagnetism
51 adsorption part
55 Load detector
60 control unit
61 type opening /
The 62-
63 mold thickness adjustment monitor
92, 94 sensor
Y1 1st reference position
Y2 2nd reference position

Claims (5)

Frame,
A first fixing member on which the stationary mold is mounted,
A second fixing member installed to face the first fixing member and through which a center rod passes;
A first movable member on which the movable mold is mounted,
A second movable member connected to the first movable member and the center rod to move together with the first movable member, the second movable member cooperating with the second fixing member to form a clamping force generating mechanism for generating a clamping force by suction force by an electromagnet. A second movable member,
A mold thickness adjusting mechanism for adjusting the distance between the first movable member and the second movable member by moving the center rod relative to the second movable member;
A sensor for acquiring information indicating a positional relationship between the center rod and the frame;
A control device for outputting an alarm when a predetermined alarm output condition based on a detection result of the sensor is satisfied,
The control device is configured to suppress the alarm when a predetermined condition is satisfied.
. The method according to claim 1,
The sensor may include: a first sensor generating a first detection signal for the purpose when the center rod moving in the mold closing direction reaches or exceeds the first reference position of the frame; and And at least one of second sensors for generating a second detection signal to the effect when the center rod moving in the mold opening direction reaches the second reference position of the frame or exceeds the second reference position. ,
The predetermined alarm output condition is satisfied when the first detection signal or the second detection signal is generated.
. The method according to claim 1,
The sensor is a first sensor for generating a first detection signal to the effect when the center rod is closer to the first fixing member than the first reference position of the frame in the mold closing direction; At least one of a second sensor for generating a second detection signal to the effect when the center rod comes to the side away from the first fixing member from the second reference position of the frame in a direction;
The predetermined alarm output condition is satisfied when the first detection signal or the second detection signal is generated.
. The method according to any one of claims 1 to 3,
The control device suppresses the alarm when the second movable member is moving.
. The method according to any one of claims 1 to 3,
The control device suppresses the alarm when the mold thickness adjusting mechanism is not in operation.
.

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