JP2019188625A - Vertical injection molding machine - Google Patents

Abstract

To provide a vertical injection molding machine capable of preventing operation from being started in a state in which a tray for receiving a resin material is placed.SOLUTION: A vertical injection molding machine 1 of this invention includes: an injection cylinder 11 provided with a nozzle 11a that faces downward at a distal end; a box-shaped cover disposed so as to surround the nozzle 11a and having an openable/closable door; and an open/close sensor 26 that detects opening/closing of the door 25. The vertical injection molding machine 1 executes a purging action to eject a resin material in the injection cylinder 11 and, after completion of the purging action, restricts the injection cylinder 11 from descending until the open/close sensor 26 detects that the door has closed after opened.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vertical injection molding machine having a purge function.

  The injection molding machine has a purge function for discharging the resin material remaining in the injection cylinder when the resin material is replaced.

  The vertical injection molding machine disclosed in Patent Document 1 is provided with a step that serves as a scaffold for removing a resin material (hereinafter referred to as “purge material”) discharged from an injection cylinder by a purge function. By using this step, the purge material discharged to a high position in the molding machine can be removed.

JP-A-11-216743

  Some vertical injection molding machines in which the nozzle at the front end of the injection molding machine is directed downward are provided with a box-shaped cover surrounding the nozzle in order to prevent the falling purge material from scattering. In the purge operation, a tray for receiving the purge material is placed below the nozzle in the cover. When the purge material accumulates in the tray, the tray is taken out and the purge material is disposed of.

  However, the purge operation may take several minutes to several tens of minutes, and the operator may leave the injection molding machine during that time. Therefore, when the operator returns to the injection molding machine, the operator may forget that the tray is placed and start the operation of the injection molding machine. As a result, the injection cylinder descends, and there is a possibility that the purge material accumulated in the tray adheres to the nozzle or the nozzle hits the tray.

  Then, an object of this invention is to provide the vertical injection molding machine which can suppress that a driving | running is started in the state in which the tray which receives a resin material was put.

  In order to achieve the above object, a vertical injection molding machine according to the present invention includes a flat upper plate on which an upper mold is attached to a lower surface, and a lower mold that forms a cavity by clamping with the upper mold. A lower plate to which a mold is attached on the upper surface, an injection cylinder disposed above the upper plate, and a nozzle facing downward is provided at the tip, a screw accommodated in the injection cylinder, and the injection cylinder are raised and lowered A cylinder driving unit, a screw driving unit for rotating and moving the screw back and forth, a control unit for controlling the cylinder driving unit and the screw driving unit, and an upper surface of the upper plate so as to surround the nozzle, A box-shaped cover having a door that can be opened and closed; and an opening and closing sensor that detects opening and closing of the door; and The cylinder drive unit and the screw drive unit are controlled to execute a purge operation for discharging the resin material in the cylinder, and the door is opened and closed by the open / close sensor after the purge operation is completed. The lowering of the injection cylinder is restricted until it is detected.

  According to the present invention, the cylinder drive unit and the screw drive unit are controlled so as to execute a purge operation for discharging the resin material in the injection cylinder. After the purge operation is finished, the lowering of the injection cylinder is restricted until it is detected by the open / close sensor that the door is opened and then closed. From this, if the opening / closing of the cover door is not detected after the purge operation, it can be estimated that the tray remains in the cover. Therefore, by restricting the lowering of the injection cylinder in a state where the tray is placed in the cover, it is possible to prevent the purge material accumulated in the tray from adhering to the nozzle or the nozzle hitting the tray.

  In the present invention, when the controller does not detect that the door is opened and closed by the opening / closing sensor until the opening / closing monitoring time elapses after the purge operation is finished, the resin material is taken out. Is preferably notified. In this way, since a certain amount of time is required until the door is opened after the purge operation is completed, unnecessary notification can be avoided by not reporting until the opening / closing monitoring time elapses. it can.

  In the present invention, it is preferable that the control unit notifies by issuing an alarm sound and stops the alarm sound when the opening / closing sensor detects that the door is opened. By doing so, it is possible to notify the operator at a remote location of the removal of the resin material. Furthermore, since the alarm sound is stopped by an action associated with taking out the tray, such as opening the door, for example, a key operation for stopping the alarm sound can be omitted.

  In the present invention, it is preferable that the control unit notifies the user by indicating an alarm display, and deletes the alarm display when the opening / closing sensor detects that the door is opened and closed. By doing in this way, an operator can grasp | ascertain that it is necessary to take out the resin material visually. Further, since the alarm display is erased by an action associated with taking out the tray, that is, opening and closing the door, for example, a key operation for deleting the alarm display can be omitted.

  In the present invention, the control unit obtains the discharge amount of the resin material by the purge operation, and when the integrated value of the discharge amount is equal to or less than a discharge allowable threshold when the purge operation is finished, the purge unit It is preferable that a new purge operation is permitted when a new purge operation following the operation is permitted and the integrated value of the discharge amount is larger than the discharge allowable threshold value. By doing so, the purge operation can be continuously executed until the integrated value of the discharge amount of the resin material is exceeded, and the work efficiency can be effectively improved.

  In the present invention, when the control unit detects that the door is opened by the open / close sensor after the purge operation is completed or the door is opened and then closed, the integrated value of the discharge amount Is preferably reset. By doing in this way, since the integrated value of the discharge amount of the resin material is reset by the action accompanying taking out the tray, the integrated value can be surely reset.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a driving | running is started in the state in which the tray which receives resin material was put.

It is a front view of a vertical injection molding machine concerning one embodiment of the present invention. It is a figure explaining the functional block of the vertical injection molding machine of FIG. It is an enlarged view of the cover vicinity of the vertical injection molding machine of FIG. It is a figure which shows an example of the alarm display displayed of the vertical injection molding machine of FIG. It is a flowchart which shows an example of the process which the control part of the vertical injection molding machine of FIG. 1 performs.

  Hereinafter, a vertical injection molding machine according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view of a vertical injection molding machine according to an embodiment of the present invention. FIG. 2 is a diagram illustrating functional blocks of the vertical injection molding machine of FIG. FIG. 3 is an enlarged view of the vicinity of the cover of the vertical injection molding machine of FIG. FIG. 3A shows a state where the cover door is open, and FIG. 3B shows a state where the cover door is closed. FIG. 4 is a diagram showing an example of an alarm display displayed on the vertical injection molding machine of FIG. FIG. 5 is a flowchart showing an example of processing executed by the control unit of the vertical injection molding machine shown in FIG.

  A vertical injection molding machine 1 according to the present embodiment shown in FIGS. 1 and 2 injects a molten resin material into a cavity formed by clamping an upper mold 2 and a lower mold 3 and cools them. A molded product is obtained by solidification.

  The vertical injection molding machine 1 makes an injection unit 10 for injecting a resin material, an upper mold 2 and a lower mold 3 abut on a machine base 5 to generate a clamping force to clamp the mold. A mold clamping unit 20 and a display operation unit 30 are provided.

  The injection unit 10 includes an injection cylinder 11 provided with a nozzle 11a facing downward at the tip, and a screw 12 accommodated in the injection cylinder 11. The injection unit 10 includes a drive unit 13 having an electric motor that moves the injection cylinder 11 up and down, an electric motor that rotates and advances the screw 12 in the injection cylinder 11, and the like. The drive unit 13 is connected to a control unit 40 described later, and operates according to a control signal from the control unit 40. The drive unit 13 corresponds to a cylinder drive unit and a screw drive unit.

  The mold clamping unit 20 includes a holding plate 21 as a flat upper plate to which the upper mold 2 is attached to the lower surface 21a, and a lower plate to which the lower mold 3 to which the upper mold 2 is clamped is attached. And a rotary table 22. A cavity is formed by clamping the upper mold 2 and the lower mold 3. The rotary table 22 has a plurality of lower molds 3 attached thereto and rotates to sequentially convey the plurality of lower molds 3 to a position facing the upper mold 2. The mold clamping unit 20 has an actuator (not shown) for opening and closing the upper mold 2 and the lower mold 3 and taking out the product.

  The injection cylinder 11 is disposed above the holding plate 21. A through hole 21b having a size capable of inserting the nozzle 11a of the injection cylinder 11 is formed at the center of the holding plate 21. The upper part of the through hole 21b is formed in a mortar shape. The nozzle 11a is inserted into the through hole 21b, and the molten resin material is injected into the cavity in a state where the nozzle 11a touches the upper mold 2.

  The mold clamping unit 20 has a cover 23 provided on the upper surface 21c of the holding plate 21 so as to surround the nozzle 11a. The cover 23 includes a cover main body 24 and a door 25. The cover body 24 is formed in a cubic box shape, and has an opening 24a on the front surface. An opening through which the injection cylinder 11 is inserted is provided on the upper surface of the cover body 24. The door 25 is attached to the cover main body 24 so that the opening 24a can be opened and closed. The cover 23 is provided with an open / close sensor 26 including a micro switch for detecting the opening / closing of the door 25. The open / close sensor 26 transmits a signal corresponding to the opening / closing of the door 25 to the control unit 40 described later. Based on the signal from the open / close sensor 26, the control unit 40 can recognize that the door 25 has been opened and closed.

  The display operation unit 30 includes a display unit 31 for displaying information related to the vertical injection molding machine 1 and an operation unit 32 for inputting operations. The display unit 31 and the operation unit 32 are connected to a control unit 40 described later. The display unit 31 displays various screens in the display area based on the control signal from the control unit 40. The display unit 31 includes a buzzer (not shown) that emits an alarm sound. The alarm sound may be a melody or a message voice. The operation unit 32 includes a plurality of keys, and transmits a signal corresponding to an operation input to each key to the control unit 40. The display operation unit 30 may include a touch panel as the operation unit 32, and may include a software switch configured by combining the touch panel overlaid on the display area on the display unit 31 and the icon displayed there.

  The vertical injection molding machine 1 also has a control unit 40 that controls the overall operation. The control unit 40 includes, for example, a microcomputer for an embedded device having a CPU, ROM, RAM, EEPROM, various I / O interfaces, and the like. The control unit 40 controls the operation of each driving device such as the driving unit 13 of the injection unit 10 and the actuator (not shown) of the mold clamping unit 20 in each process such as a mold closing process, an injection process, a mold opening process, and a product removal process. To do.

  The control unit 40 controls the driving unit 13 of the injection unit 10 to perform a purge operation for discharging the resin material from the injection cylinder 11. In this embodiment, the purge operation refers to the following operation. That is, the injection unit 10 is raised (retracted) so that the nozzle 11a of the injection cylinder 11 is separated from the mold. Then, in this state, the operation of rotating and retreating the screw 12 (“plasticizing operation”), the operation of moving the screw 12 forward (“injection operation”), or the plasticizing operation and the injection operation in the same manner as the weighing. This is a combination of actions. In addition, idling is also included in the purge operation. “Improve” is an operation in which the resin material is not supplied in front of the screw 12 and the screw 12 is moved backward and forward in the injection cylinder 11. In the purge operation, the purge material discharge amount can be calculated based on the inner diameter of the injection cylinder 11 and the advance distance of the screw 12. Alternatively, the number of executions of the purge operation may be used as the purge material discharge amount.

  When performing the purge operation, the operator inputs an operation to the operation unit 32 and raises the injection cylinder 11 to a position where the nozzle 11a is separated from the mold and spaced apart from the holding plate 21 in the vertical direction. Then, as shown in FIG. 3A, the door 25 of the cover 23 is opened, and the tray T that receives the purge material is placed in the cover main body 24. Thereafter, the door 25 is closed as shown in FIG. The tray T is disposed so as to face the nozzle 11a in the vertical direction. After placing the tray T in the cover, the purge operation is executed. The tray T may be placed in the through hole 21 b of the holding plate 21.

  The control unit 40 controls the drive unit 13 to execute a purge operation for discharging the resin material in the injection cylinder 11. Then, after the purge operation is completed, the control unit 40 detects the injection cylinder other than the purge operation until it is detected by the open / close sensor 26 that the door 25 is opened and closed (hereinafter simply referred to as “door 25 open / close”). 11 or all operations involving the movement of the screw 12 are restricted. The control part 40 should just be comprised so that the downward movement (advance) of the injection cylinder 11 may be controlled.

  In addition, the control unit 40 acquires (calculates) the purge material discharge amount. When the integrated value M of the discharge amount of the purge material is equal to or less than the discharge allowable threshold Sp at the time when the purge operation is completed, the control unit 40 allows a new purge operation following the purge operation, and When the integrated value M of the discharge amount of the purge material is larger than the discharge allowable threshold value Sp, a new purge operation is restricted. Then, when the opening / closing of the door 25 is detected by the opening / closing sensor 26 after the purge operation is completed, the control unit 40 resets the integrated value M of the purge material discharge amount. The controller 40 may reset the integrated value M when the opening / closing sensor 26 detects that the door 25 is opened.

  Further, when the opening / closing monitoring time Tk (for example, 60 seconds, an arbitrary value can be set) elapses after the purge operation is completed, the control unit 40 detects that the opening / closing sensor 26 does not detect the opening / closing of the door 25. The purge material is notified to be taken out.

  Specifically, the control unit 40 notifies by issuing an alarm sound from the buzzer of the display unit 31. When the opening / closing sensor 26 detects that the door 25 is opened, the control unit 40 stops the alarm sound. Moreover, you may make it alert | report by the control part 40 displaying the alarm display 60 shown in FIG. 5 on the display part 31 simultaneously with an alarm sound. When the opening / closing sensor 26 detects the opening / closing of the door 25, the control unit 40 deletes the alarm display 60. The alarm sound and alarm display 60 may be stopped and deleted by a predetermined operation input (for example, pressing an off key or a reset switch).

  Next, an example of the operation | movement which concerns on this invention in the control part 40 of the vertical injection molding machine 1 of this embodiment mentioned above is demonstrated with reference to FIG.

  When an operation for starting the purge operation is input by the operator, the control unit 40 executes the purge operation (S110) and waits until the purge operation is completed (N in S120). When the purge operation is completed (Y in S120), timing is started (S130), and the purge material discharge amount and its integrated value M are calculated (S140). When the integrated value M of the purge material discharge amount is equal to or less than the discharge allowable threshold value Sp (Y in S150), it is determined whether the opening / closing of the door 25 is detected (S160). When opening / closing of the door 25 is detected (Y in S160), the integrated value M of the purge material discharge amount is reset, and the process is terminated (S290). If opening / closing of the door 25 is not detected (N in S160), it is determined whether or not an operation is input to the operation unit 32 (S170). If no operation is input to the operation unit 32 (N in S170), the process returns to the detection of opening / closing of the door 25 (S160). When an operation is input to the operation unit 32 (Y in S170) and the operation is an operation for starting the purge operation (Y in S180), the purge operation is executed again (S110). When the operation input to the operation unit 32 is an operation other than an operation for starting the purge operation (N in S180), a message indicating that an operation other than the purge operation is restricted is displayed on the display unit 31 (S190). The process returns to the detection of opening / closing of the door 25 again (S160).

  When the integrated value M of the purge material discharge amount is larger than the discharge allowable threshold value Sp (N in S150), the control unit 40 determines whether the open / close monitoring time Tk has elapsed since the purge operation was completed. (S200). If the opening / closing monitoring time Tk has not elapsed (N in S200), it is determined whether opening / closing of the door 25 is detected (S210). When the opening / closing of the door 25 is detected (Y in S210), the integrated value M of the purge material discharge amount is reset and the process is terminated (S290). If opening / closing of the door 25 is not detected (N in S210), it is determined whether or not an operation is input to the operation unit 32 (S220). If no operation is input to the operation unit 32 (N in S220), the process returns to the determination of the elapse of the open / close monitoring time Tk (S200). When an operation is input to the operation unit 32 (Y in S220), a message indicating that all operations involving the movement of the injection cylinder 11 and the screw 12 including the purge operation are restricted is displayed (S230). The process returns to the determination of the elapse of the opening / closing monitoring time Tk (S200).

  When the open / close monitoring time Tk has elapsed (Y in S200), the control unit 40 generates an alarm sound and displays an alarm display 60 to notify the removal of the purge material (S240). Then, it waits until it is detected that the door is opened (N in S250), and when it is detected that the door is opened (Y in S250), the alarm sound is stopped (S260). After that, it waits until it is detected that the door is closed (N in S270), and when it is detected that the door is closed (Y in S270), the alarm display 60 is deleted (S280). Then, the integrated value M of the purge material discharge amount is reset and the process is terminated (S290).

  As described above, the vertical injection molding machine 1 according to the present embodiment executes the purge operation for discharging the resin material in the injection cylinder 11. After the purge operation is finished, the lowering of the injection cylinder 11 is restricted until it is detected by the open / close sensor 26 that the door is opened and then closed. Thus, if the opening / closing of the door 25 of the cover 23 is not detected after the purge operation, it can be estimated that the tray T is still placed in the cover 23. Therefore, by restricting the lowering of the injection cylinder 11 in a state where the tray T is placed in the cover 23, the purge material accumulated in the tray T adheres to the nozzle 11a, or the nozzle 11a hits the tray T. This can be suppressed.

  Further, when the opening / closing sensor 26 does not detect the opening / closing of the door 25 from when the purge operation is completed until the opening / closing monitoring time Tk elapses, the removal of the purge material is notified. In this way, since a certain amount of time is required until the door 25 is opened and closed after the purge operation is completed, unnecessary notification is avoided by not reporting until the opening / closing monitoring time Tk elapses. be able to.

  Further, the alarm sound is notified, and when the opening / closing sensor 26 detects that the door 25 is opened, the alarm sound is stopped. By doing so, it is possible to notify the operator at a remote location of the removal of the purge material. Furthermore, since the alarm sound is stopped by the action associated with taking out the tray T, such as opening the door 25, for example, a key operation for stopping the alarm sound can be omitted. You may make it stop an alarm sound only by key operation.

  In addition, the alarm display 60 is notified, and the alarm display 60 is deleted when the opening / closing sensor 26 detects that the door 25 is opened and closed. By doing so, the operator can grasp that the purge material needs to be taken out visually. Further, since the alarm display 60 is erased by an action associated with the removal of the tray T, that is, after the door 25 is opened, the key operation for erasing the alarm display 60 can be omitted. The alarm display may be deleted only by key operation.

  Also, the purge material discharge amount is acquired. Then, when the integrated value M of the purge material discharge amount is equal to or less than the discharge allowable threshold Sp when the purge operation is completed, a new purge operation following the purge operation is permitted. When the integrated value M of the discharge amount of the purge material is larger than the discharge allowable threshold value Sp, a new purge operation is restricted. By doing so, the purge operation can be continuously executed until the integrated value M of the discharge amount of the purge material exceeds the discharge allowable threshold value Sp, and the work efficiency can be effectively improved. By setting the discharge allowable threshold Sp to be equal to or less than the purge material discharge amount in one purge operation, the elapse of the open / close monitoring time Tk is confirmed every time the purge operation is executed, and the purge is performed by an alarm sound or the like. The material removal can be notified.

  When the opening / closing of the door 25 is detected by the opening / closing sensor 26 after the purge operation is completed, the integrated value M of the purge material discharge amount is reset. By doing so, the integrated value M of the purge material discharge amount is reset by the action accompanying the removal of the tray T, so that the integrated value M can be reset reliably.

  In addition to the embodiment described above, for example, the operation of notifying the calculation of the discharge amount of the purge material and the notification of the removal of the purge material is omitted, and until the opening / closing of the door 25 is detected by the open / close sensor 26 after the purge operation is completed. Only an operation for restricting the lowering of the injection cylinder 11 may be performed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Those in which those skilled in the art appropriately added, deleted, and changed the design of the above-described embodiments, and combinations of the features of the embodiments as appropriate, also include the present invention as long as they include the gist of the present invention. It is included in the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 ... Vertical injection molding machine, 2 ... Upper metal mold, 3 ... Lower metal mold, 5 ... Machine stand, 10 ... Injection unit, 11 ... Injection cylinder, 11a ... Nozzle, 12 ... Screw, 13 ... Drive part, 20 ... Clamping unit, 21 ... holding plate (upper plate), 21a ... lower surface, 21b ... through hole, 21c ... upper surface, 22 ... rotary table (lower plate), 22a ... upper surface, 23 ... cover, 24 ... cover body, 24a ... Opening, 25 ... Door, 26 ... Open / close sensor, 30 ... Display operation unit, 31 ... Display unit, 32 ... Operation unit, 40 ... Control unit, 60 ... Alarm display, T ... Tray, M ... Integral value, Sp ... Discharge Allowable threshold, Tk: Open / close monitoring time

Claims (6)

A flat upper plate to which the upper mold is attached to the lower surface;
A lower plate to which a lower mold that forms a cavity by being clamped with the upper mold is attached to an upper surface;
An injection cylinder disposed above the upper plate and provided with a nozzle facing downward;
A screw housed in the injection cylinder;
A cylinder drive for raising and lowering the injection cylinder;
A screw drive for rotating and moving the screw forward and backward,
A control unit for controlling the cylinder driving unit and the screw driving unit;
A box-shaped cover having an openable / closable door provided on the upper surface of the upper plate so as to surround the nozzle;
An opening / closing sensor for detecting opening / closing of the door,
The control unit controls the cylinder drive unit and the screw drive unit to execute a purge operation for discharging the resin material in the injection cylinder, and the door is opened by the open / close sensor after the purge operation is completed. A vertical injection molding machine that regulates the lowering of the injection cylinder until it is detected that the cylinder is closed after being opened.   The control unit notifies the removal of the resin material when the opening / closing sensor does not detect that the door is opened and closed after the purge operation is completed and before the opening / closing monitoring time elapses. The vertical injection molding machine according to claim 1.   3. The saddle type according to claim 2, wherein the control unit notifies by issuing an alarm sound, and stops the alarm sound when the opening / closing sensor detects that the door is opened. Injection molding machine.   3. The control unit according to claim 2, wherein the control unit notifies the user by indicating an alarm display, and deletes the alarm display when the open / close sensor detects that the door is opened and closed. Item 4. A vertical injection molding machine according to item 3.   The control unit obtains the discharge amount of the resin material by the purge operation, and when the integrated value of the discharge amount is equal to or less than the discharge allowable threshold at the time when the purge operation is completed, a new value following the purge operation is obtained. 5. A new purge operation is restricted when the purge operation is allowed and the integrated value of the discharge amount is larger than the discharge allowable threshold value. 6. The vertical injection molding machine described in 1.   When the control unit detects that the door is opened by the open / close sensor after the purge operation is completed or the door is opened and then closed, the integrated value of the discharge amount is reset. The vertical injection molding machine according to claim 5.

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