JP4865751B2 - Safety door device for molding machine - Google Patents

Description

  The present invention relates to a safety door device of a molding machine including a safety door mechanism having a side door portion and an upper surface door portion that can open and close a side opening portion and an upper surface opening portion in a mold clamping mechanism.

  In general, the mold clamping mechanism in an injection molding machine is provided with a safety door mechanism at the side opening portion on the operation side, and when the safety door mechanism is opened during operation, the mold clamping is controlled by the control system. A safety door device that quickly stops the drive unit that drives the mechanism is provided to ensure safety when an operator's hand or the like enters the mold clamping mechanism by mistake. By the way, for safety, a higher level of safety is required, and a safety door (upper guard) attached not only to the side opening portion but also to the top opening portion in the mold clamping mechanism is also required.

Conventionally, a safety door device provided in an injection molding machine disclosed in Patent Document 1 is known as a safety door device in which safety doors are attached to side opening portions and top opening portions in such a mold clamping mechanism. In the same document 1, an upper cover portion is provided so as to cover an upper portion between a fixed cover of a mold clamping unit and a fixed platen to which a fixed mold is attached, and this upper cover portion is integrated with an operation side safety cover portion. A safety door device is disclosed in which a cover made of a simple steel plate is formed, and an upper window made of a transparent plate is provided in the upper cover part, and the state of a mold in the cover can be confirmed.
JP 2003-25405 A

  However, the above-described conventional safety door device (injection molding machine) of a molding machine has the following problems.

  First, since the upper cover portion and the operation side safety cover portion are integrally formed, the upper cover portion is also opened and closed together every time the operation side safety cover portion is opened and closed, and unnecessary labor is forced. In other words, the operation side safety cover portion needs to be opened and closed relatively frequently, whereas the upper cover portion is usually only opened and closed when the mold is changed, and the weight is low because of the steel plate cover. Unnecessary labor required for opening and closing operations becomes large. As the molding machine becomes larger, the cover becomes larger and heavier, and this adverse effect becomes greater.

  Second, during normal operations, it is often preferable to close the top cover to prevent dust and dirt from entering the mold and its surroundings. Since the operation side safety cover is integrated, the upper cover is also opened each time the operation side safety cover is opened. As described above, there is a difficulty in functionality and usability (convenience) because individual use such as opening and closing only the operation side safety cover portion cannot be performed.

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

  In order to solve the above-described problems, the present invention provides a safety door mechanism 3 having a side door portion and an upper surface door portion capable of opening and closing at least a side opening portion and an upper surface opening portion in the mold clamping mechanism 2, and opening and closing the safety door mechanism 3. When configuring the safety door device 1 of the molding machine M including the control system 4 that detects the state and controls it to the safe side, the side door portion 3s that opens and closes the side opening portion and the top door portion that opens and closes the top opening portion 3u is arranged so that it can be opened and closed independently, and when one or both of the top door part 3u and the side door part 3s opens the top door part 3u, the top door part 3u and the side door part 3s are mechanical. And a control system 4 for detecting only the open / closed state of the side door part 3s with respect to the open / closed state of the top door part 3u and the side door part 3s.

  In this case, according to a preferred aspect of the invention, the interlocking mechanism 5 includes the locking portion 11 provided on the upper surface door portion 3u and the locked portion 12 provided on the side door portion 3s and capable of being locked to the locking portion 11. Can be configured. At this time, the locking portion 11 can be constituted by a protruding piece portion 11s attached to and protruded from the inner surface 3ui of the upper door portion 3u, and the locked portion 12 is attached to the inner surface 3si of the side door portion 3s. It can comprise by the protruding piece part 11s protruded.

  According to the safety door device 1 of the molding machine M according to the present invention as described above, the following remarkable effects can be obtained.

  (1) A side door portion 3s that opens and closes the side surface opening portion and a top surface door portion 3u that opens and closes the top surface opening portion are arranged to be independently openable and closable, and one of the upper surface door portion 3u and the side door portion 3s. Alternatively, since the interlocking mechanism 5 that mechanically locks the upper door portion 3u and the side door portion 3s when the upper door portion 3u is opened is provided on both sides, the side surface is secured while ensuring the safety related to the upper door portion 3u. The door 3s can be opened and closed independently. Therefore, even if the operation is performed relatively frequently, the safety door mechanism 3 can be reduced in weight, thereby facilitating the operation and further reducing the work effort. And this merit becomes so large that the molding machine M becomes large.

  (2) Since the side door 3s can be opened and closed independently with the top door 3u closed, the top door 3u can be opened even when the side door 3s is opened and necessary work is performed. The closed state can be maintained. Therefore, it is possible to improve the functionality and usability (convenience), such as avoiding the problem that dust and dirt enter the mold and its surroundings.

  (3) Since the control system 4 that detects only the open / closed state of the side door part 3s is provided for the open / closed state of the top door part 3u and the side door part 3s, the interlock mechanism 5 is provided when the top door part 3u is opened. As a result, the side door portion 3s is also opened together. Therefore, the control system 4 attached to the side door portion 3s operates, and the safety related to the top door portion 3u is ensured. Moreover, since the detection switch attached to the upper surface door 3u and the wiring associated therewith can be eliminated, it is possible to avoid complication of the configuration of the entire control system 4 and to contribute to cost reduction.

  (4) According to a preferred embodiment, the interlocking mechanism 5 is constituted by a locking portion 11 provided on the upper door portion 3u and a locked portion 12 provided on the side door portion 3s and capable of being locked to the locking portion 11. For example, since it is possible to correspond to various shapes and positional relationships of the top door portion 3u and the side door portion 3s, it can be applied to various types of safety door mechanisms.

  (5) According to a preferred embodiment, the locking portion 11 is constituted by a protruding piece portion 11s that is fixed and protruded to the inner surface 3ui of the upper surface door portion 3u, or the locked portion 12 is an inner surface of the side door portion 3s. If it is constituted by the protruding piece portion 12s fixed to 3si and projected, it can be easily implemented without changing the top door portion 3u and the side door portion 3s itself (shape change, design change, etc.), and existing molding It can be easily attached to the machine M by retrofitting.

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

  First, a schematic configuration of an injection molding machine (molding machine) M including the safety door device 1 according to the present embodiment will be described with reference to FIG.

  In FIG. 1, M indicated by an imaginary line is an injection molding machine, which includes a machine base Mb, an injection device Mi and a mold clamping device Mc installed on the machine base Mb. The injection device Mi includes a heating cylinder 21, an injection nozzle that does not appear in the drawing at the front end of the heating cylinder 21, and a hopper 22 that supplies material at the rear of the heating cylinder 21. On the other hand, the mold clamping device Mc is entirely covered with an outer cover 23, and inside the outer cover 23. In FIG. 1, a right side area in FIG. A mold clamping mechanism 2 having a movable plate or the like that does not appear in the drawing supporting the mold is disposed, and a drive mechanism for driving the mold clamping mechanism 2 is disposed in the left area. The entire drive mechanism is covered with a fixed drive mechanism cover 23c. On the other hand, on both lateral sides of the mold clamping mechanism 2, an operation-side side door portion 3 s located on the front side and a counter-operation side side door portion 3 r located on the back side are disposed, respectively, and the upper side of the mold clamping mechanism 2. Is provided with an upper surface door portion 3u covering the mold clamping mechanism 2. Reference numerals 25 and 26 denote a display with a touch panel and an operation unit attached to a molding machine controller built in the injection molding machine M.

  Next, the configuration of the safety door device 1 according to the present embodiment will be specifically described with reference to FIGS.

  The safety door device 1 includes a safety door mechanism 3, and the safety door mechanism 3 further includes a side door portion 3s and an upper surface door portion 3u. The side door portion 3s and the upper surface door portion 3u can open and close the side surface opening portion and the upper surface opening portion in the mold clamping mechanism 2 by sliding in the left-right direction. In the present embodiment, the mold opening / closing direction will be described as the left-right direction.

  As shown in FIG. 2, the side door portion 3 s is formed in a rectangular shape as a whole, has a transparent plate 32 on the inner side of the frame-shaped door plate 31, and a handle portion 33 on the outer surface. As shown in FIG. 1, the upper surface door portion 3u is also formed in a rectangular shape, and has a window-like transparent plate 35 on the inner side of the door plate 34, and a handle portion 36 is provided on the outer surface (upper surface). In addition, a front upper guard rail 41 and a lower guide rail 42 that are spaced apart from each other are disposed inside the side door portion 3s, and rotating rollers 43, four at the upper, lower, left, and right positions on the inner surface 3si of the side door portion 3s. 43 are arranged, and the rotation rollers 43 are loaded on the front upper guard rail 41 and the lower guide rail 42, respectively. Further, on the back side of the mold clamping mechanism 2, rear upper guard rails 44 having the same height as the front upper guard rails 41 are arranged in parallel, and rotating rollers are provided at four front and rear left and right positions on the inner surface 3ui of the upper door portion 3u. 45, 45... Are arranged, and the rotation rollers 45 are loaded on the front upper guard rail 41 and the rear upper guide rail 44, respectively.

  On the other hand, the safety door device 1 includes a control system 4 that detects the open / closed state of the side door portion 3s and controls it to the safe side. Therefore, as shown in FIG. 1, the control system 4 includes a detection unit 51 that detects the open / closed state of the side door portion 3s, and the detection unit 51 is further in the vicinity of the lower end side of the side door portion 3s. The pair of detection switches 51a and 51b that are spaced apart from each other in the opening / closing direction (sliding direction) of the side door portion 3s, and the left side of the side door portion 3s in the position where the side door portion 3s is closed. A third detection switch 51c is provided. An operation cam 52 that can operate the detection switches 51a and 51b is provided on the inner surface 3si of the side door portion 3s. In this case, a limit switch using a contact (normally off) can be used as the detection switch 51a, and a limit switch using a b contact (normally on) can be used as the detection switch 51b.

  The detection switches 51a and 51b are connected to a control unit 53 configured by a control circuit, and the third detection switch 51c is connected to a drive unit 54 that constitutes a part of the drive mechanism. Thus, the drive unit 54 is controlled via the control unit 53 for the detection results of the detection switches 51a and 51b, and without passing through the control unit 53 for the detection result of the detection switch 51c. Directly controlled. With the above configuration, the control system 4 that detects the open / closed state of the side door portion 3s and controls it to the safe side is configured. Therefore, the control system 4 detects only the open / closed state of the side door part 3s with respect to the top door part 3u and the side door part 3s, and does not detect the open / closed state of the side door part 3s.

  Furthermore, the interlocking mechanism 5 which comprises the principal part of this invention is provided between the upper surface door part 3u in the safety door mechanism 3, and the side door part 3s. The interlocking mechanism 5 has a function of mechanically locking the upper door portion 3u and the side door portion 3s when the upper door portion 3u is opened, and the locking portion 11 provided on the upper door portion 3u and the side door portion. It is comprised by the to-be-latched part 12 provided in 3s.

  In this case, as the locking portion 11, a protruding piece portion 11s that is fixed and protruded to the inner surface 3ui of the upper door portion 3u is used. As shown in FIG. 3, the illustrated upper surface door portion 3u is formed in a flat box shape with the lower surface opened, and the protruding piece portion 11s is an inner surface 3usi of the side surface portion 3us constituting the upper surface door portion 3u. It is attached at a position on the injection device Mi side (see FIGS. 1 and 2). The projecting piece portion 11s is integrally formed of a metal material, and includes an attachment portion 61 that can be attached to the inner surface 3usi with a screw or the like, and an L-shaped portion 62 that protrudes from the attachment portion 61 in a direction perpendicular to the inner surface 3usi. The L-shaped portion 62 further includes a horizontal portion 62h protruding from the mounting portion 61 and a vertical engagement portion 62v extending downward from the tip of the horizontal portion 62h.

  Further, the latched portion 12 uses a protruding piece portion 12s fixed and protruded on the inner surface 3si of the side door portion 3s, and this protruding piece portion 12s is on the injection device Mi side of the inner surface 3si of the side door portion 3s. And it attaches to the upper position (refer FIG.1 and FIG.2). The projecting piece portion 12s is integrally formed of a metal material, and is attached to the inner surface 3si with a screw or the like, and a horizontal engagement portion 64 protruding from the mounting portion 63 in a direction perpendicular to the inner surface 3si. Consists of.

  On the other hand, as shown in FIGS. 2 and 3, the positional relationship between the protruding piece portions 11s and 12s is such that the protruding piece portion 11s on the upper surface door portion 3u side is injected with respect to the protruding piece portion 12s on the side door portion 3s side. The vertical engaging portion 62v of the protruding piece portion 11s and the horizontal engaging portion 64 of the protruding piece portion 12s are in contact with each other with the upper door portion 3u and the side door portion 3s completely closed while being arranged on the apparatus Mi side. Or it sets to the close positional relationship. As a result, when the top door 3u is opened, the top door 3u and the side door 3s are mechanically locked, and the side door 3s is also opened together by the interlocking mechanism 5. The control system 4 attached to is operated, and the safety related to the upper door portion 3u is ensured. Therefore, even when the control system 4 detects only the open / closed state of the side door portion 3s with respect to the top door portion 3u and the side door portion 3s, the safety related to the top door portion 3u is ensured. . Therefore, since the detection switch attached to the upper surface door 3u and the wiring associated therewith can be eliminated, it is possible to avoid complication of the configuration of the entire control system 4 and to contribute to cost reduction.

  As described above, when the interlocking mechanism 5 is configured, the interlocking mechanism 5 is configured by the locking portion 11 provided on the upper surface door portion 3u and the locked portion 12 provided on the side door portion 3s and capable of being locked to the locking portion 11. Since the upper surface door portion 3u and the side surface door portion 3s can correspond to various shapes and positional relationships, there is an advantage that they can be applied to various types of safety door mechanisms. Further, the locking portion 11 is constituted by a protruding piece portion 11s fixed and protruded on the inner surface 3ui of the upper surface door portion 3u, and the locked portion 12 is fixed and protruded on the inner surface 3si of the side door portion 3s. If constituted by the projecting piece 12s thus made, it can be easily carried out without changing the top door part 3u and the side door part 3s itself (shape change, design change, etc.), and can be retrofitted to an existing molding machine M. There is an advantage that it can be installed more easily.

  Next, the operation (function) of the safety door device 1 according to the present embodiment will be described with reference to FIGS. 4 and 5. 4 and 5 schematically show the side door portion 3s and the top door portion 3u, and the same parts as those in FIGS. .

  First, FIGS. 4A to 4D show the movement (interlocking relationship) between the upper door portion 3u and the side door portion 3s when the upper door portion 3u is opened and closed. FIG. 4A shows a state in which both the upper door portion 3u and the side door portion 3s are completely closed. In FIG. 4, Xo indicates a closed position line.

  Assume that the top door 3u is opened from the state shown in FIG. In this case, as shown in FIG. 4 (b), the upper door portion 3u can be opened by operating the handle portion 36 and sliding the upper door portion 3u in the direction of the arrow Fuo. At this time, since the locking portion 11 is locked to the locked portion 12, the side door portion 3s is also opened together. Accordingly, the control system 4 attached to the side door portion 3s operates to perform stop control or the like on the drive unit 54, thereby ensuring the safety related to the top door portion 3u. Although the upper door portion 3u and the side door portion 3s are opened together, the upper door portion 3u is normally opened and closed when the mold is exchanged, so that even if a large operating force is required, there is much trouble. Does not occur.

  Further, when the upper door portion 3u is closed from the opened state of FIG. 4B, the handle portion 33 of the side door portion 3s is operated and slid in the arrow Fsc direction as shown in FIG. 4C. You can do it. At this time, since the locked portion 12 is locked to the locking portion 11, the upper surface door portion 3u can also be closed together. As shown in FIG. 4D, if the handle portion 36 is operated from the opened state of FIG. 4B to slide the upper door portion 3u in the direction of the arrow Fuc, only the upper door portion 3u is moved. Can be closed. At this time, since the side door portion 3s is maintained in an open state, it is possible to continue to perform necessary work and the like with only the side door portion 3s being opened.

  On the other hand, FIGS. 5A to 5C show the movement (interlocking relationship) between the side door portion 3s and the top door portion 3u when the side door portion 3s is opened and closed. FIG. 5A shows a state in which both the upper door portion 3u and the side door portion 3s are completely closed. From this state, when the side door portion 3s is opened, as shown in FIG. 5B, if the handle portion 33 is operated and the side door portion 3s is slid in the arrow Fsoc (open) direction, The side door portion 3s can be opened. At this time, since the locked portion 12 and the locking portion 11 are not locked, the upper surface door portion 3u is kept closed. Therefore, when the side door portion 3s is closed from the opened state shown in FIG. 5B, the handle portion 33 is operated to slide the side door portion 3s in the direction of the arrow Fsoc (closed). The door part 3s can be closed.

  Further, as shown in FIG. 5C, when the side door portion 3s is in an open state, the upper surface door portion 3u is operated by sliding the upper surface door portion 3u in the direction of the arrow Fuoc by operating the handle portion 36. Can be opened and closed freely. Therefore, for example, when the work is performed with the side door portion 3s opened, the upper door portion 3u can be opened and closed as necessary when the upper door portion 3u is in the way.

  Thus, according to the safety door device 1 according to the present embodiment, the side door portion 3s that opens and closes the side surface opening portion and the upper surface door portion 3u that opens and closes the top surface opening portion can be independently opened and closed. In addition, since one or both of the upper door portion 3u and the side door portion 3s is provided with the interlocking mechanism 5 that mechanically locks the upper door portion 3u and the side door portion 3s when the upper door portion 3u is opened. The side door 3s can be opened and closed independently while ensuring the safety of the upper door 3u. Therefore, even if the operation is performed relatively frequently, the safety door mechanism 3 can be reduced in weight, thereby facilitating the operation and further reducing the work effort. And this merit becomes so large that the molding machine M becomes large. Further, since the side door 3s can be opened and closed independently with the top door 3u closed, the top door 3u is closed even when the side door 3s is opened and necessary work is performed. Can be maintained. Therefore, it is possible to improve the functionality and usability (convenience), such as avoiding the problem that dust and dirt enter the mold and its surroundings.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the detailed configuration, shape, quantity, circuit configuration, and the like do not depart from the gist of the present invention. It can be changed, added, or deleted arbitrarily. For example, when the interlocking mechanism 5 is configured, the case where the locking portion 11 is provided on the upper door portion 3u and the locked portion 12 is provided on the side door portion 3s is shown. However, the locked portion 12 may be omitted by locking the locking portion 11 to a part of the end surface of the side door portion 3s. Similarly, only the locked portion 12 is provided on the side door portion 3s, and the locked portion 11 may be omitted by locking the locked portion 12 to a part of the end surface or the like of the top door portion 3u. Good. Further, the engaging portion 11 is constituted by a protruding piece portion 11s attached to and protruded from the inner surface 3ui of the upper door portion 3u, and the protruding piece portion attached and protruded from the inner surface 3si of the side door portion 3s. Although the case where it comprised by 11s was shown, the latching | locking part 11 and the to-be-latched part 12 may be integrally formed as a part of the upper surface door part 3u and the side surface door part 3s. In this case, the configuration can be further simplified. In addition, although the injection molding machine M was illustrated as a molding machine provided with the safety door apparatus 1 which concerns on this invention, it can utilize similarly also to various molding machines, such as an extrusion molding machine provided with a safety door mechanism.

Schematic diagram of a safety door device according to the best embodiment of the present invention and an injection molding machine equipped with this safety door device, Front view of the safety door device, The perspective view which shows the structure of the interlocking mechanism in the same safety door apparatus, Explanatory drawing using the typical composition which shows the movement (interlocking relation) of the upper door part and the side door part when opening and closing the upper door part of the safety door device, Explanatory drawing using the typical composition showing the movement (interlocking relation) of the side door part and the top door part when the side door part of the safety door device is opened and closed,

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1: Safety door apparatus, 2: Clamping mechanism, 3: Safety door mechanism, 3s: Side door part, 3u: Upper surface door part, 3ui: Inner surface of upper surface door part, 3si: Inner surface of side door part, 4: Control system , 5: interlocking mechanism, 11: locking portion, 11s: protruding piece portion, 12: locked portion, 12s: protruding piece portion

Claims (4)

  A safety door mechanism having a side door portion and an upper surface door portion capable of opening and closing at least the side surface opening portion and the upper surface opening portion in the mold clamping mechanism, and a control system for detecting the open / closed state of the safety door mechanism and controlling it to the safe side. In the safety door device of the molding machine, a side door portion that opens and closes the side surface opening portion and a top surface door portion that opens and closes the top surface opening portion are disposed so as to be independently openable and closable. One or both of the side door portions is provided with an interlocking mechanism that mechanically locks the upper surface door portion and the side door portion when the upper surface door portion opens, and opens and closes the upper surface door portion and the side door portion. A safety door device for a molding machine, comprising a control system that detects only the open / closed state of the side door portion.   The said interlocking mechanism is comprised by the latching | locking part provided in the said upper surface door part, and the to-be-latched part which is provided in the said side door part and can be latched to the said latching | locking part. Safety door device for molding machines.   3. The safety door device for a molding machine according to claim 2, wherein the locking portion is constituted by a protruding piece portion that is attached to and protruded from the inner surface of the upper surface door portion.   3. The safety door device for a molding machine according to claim 2, wherein the locked portion is constituted by a protruding piece portion that is attached to and protruded from the inner surface of the side door portion.

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