JP5191304B2 - Machine tool with safety door opening / closing control mechanism, and injection molding machine or die casting machine - Google Patents

Description

  The present invention relates to a machine tool such as an injection molding machine or a die casting machine provided with a safety door opening / closing control mechanism capable of eliminating the concern that an operator may be exposed to danger in accordance with an operation such as mold opening / closing.

  Conventionally used injection molding machines are provided with a safety door at the entrance of the mold so that the operator is not injured when the mold is opened and closed. In such an injection molding machine, the mold cannot be opened and closed when the safety door is opened due to safety issues. Regardless of what the mold opening / closing operation can be started, the mold opening / closing operation starts against the operator's will when the safety door is accidentally closed against the operator's intention. For example, if the operator performs an inspection work in the vicinity of the mold apparatus inside the safety door, the operator may be exposed to danger. Therefore, in Patent Document 1, it is configured so that the stopper lever is brought into contact with the stopper block of the guide rail that guides the safety door so that the safety door does not close regardless of the intention of the operator. A structure is disclosed in which the safety door is prevented from closing against the operator's will by contacting the stopper block. Further, Patent Document 2 discloses that when the operator is in the mold clamping device or the like, the safety door is opened when the safety door is in a position opened from the second position in order to prevent the safety door from being accidentally closed. A safety device for an injection molding machine is disclosed that restricts the closing operation of the safety door by the stopper rod becoming a serving rod as it closes.

Japanese Utility Model Publication No. 5-2935 Japanese Patent No. 3741073

  However, the safety devices disclosed in Patent Document 1 and Patent Document 2 described above have a safety mechanism that prevents the opened safety door from closing unexpectedly. Since there is no safety mechanism that prevents the safety door from being opened, if the safety door is opened while the mold is being opened or closed, etc. This is also not safe for safety.

  In general, from the viewpoint of safety, it is preferable that the mold apparatus is operated only when the safety door is closed. However, in Patent Document 1 and Patent Document 2, the closed safety door is opened. Since it does not have a lock mechanism to hold so that the safety door can be easily opened during operation of the injection molding machine, for example, when the safety door is opened, Although it is not unreasonable to increase safety by providing a function to emergency stop the operation of the mold device as the safety door opens, even if an emergency stop is performed, the safety door can be opened. At the same time, since it is difficult to stop the mold opening and closing operation instantaneously, there is a concern that the operator may touch the mold or the like that has not been stopped and an unexpected accident may occur.

  The present invention has been made in view of the above problems, and can prevent the safety door from being opened when the safety door is closed, and can prevent the closing when the safety door is opened. Injection molding with improved safety that can prevent a part of the human body from entering the operating area where the mold is opened and closed inside the safety door during operation It aims at providing machine tools, such as a machine and a die-casting machine.

  A machine tool provided with a safety door opening / closing control mechanism according to the present invention includes a stopper provided on a safety door that can be opened and closed, and a stopper pin that is advanced and retracted by a cylinder is engaged with an insertion hole provided in the stopper. In a machine tool provided with a safety door opening / closing control mechanism that keeps the closed state so that the door does not open, when the safety door is closed, the stopper pin projects as an opening preventing means and engages with the insertion hole. In the state where the safety door is prevented from opening so that the safety door cannot be opened, while the safety door is opened and the stopper pin is not engaged with the insertion hole, the protruding stopper pin is closed by the safety door. It is also used as a closing prevention means for preventing.

  With the above configuration, when the safety door is closed, the protruding stopper pin is engaged with the insertion hole, so that the safety door can be prevented from being opened inadvertently. When the door is opened, the safety door can be prevented from being closed by the protruding stopper pin.

  Furthermore, the machine tool provided with the safety door opening / closing control mechanism according to the present invention may be configured such that when the safety door is open and the stopper pin is protruded, the safety door is in a state of preventing the safety door from being closed. An operation button is provided for switching back so that the safety door can be closed.

  With the above configuration, when the opened safety door is closed, the operation button is operated to retract the protruding stopper pin to close the safety door.

  Furthermore, the machine tool provided with the safety door opening / closing control mechanism according to the present invention is an injection molding machine or a die-casting machine, and the safety door is disposed at an inlet / outlet of a mold apparatus provided in the injection molding machine or the die-casting machine. When the injection molding machine or the die casting machine is in operation and the safety door is in the opening-preventing state, when the mold apparatus is opened / closed, the stopper pin is switched using the operation button. Control means for holding the stopper pin in a protruding state without being retracted so that the safety door is not opened even if an operation is performed.

  With the above configuration, the safety door prevents the stopper pin from being retracted even if an operation for enabling the safety door to be opened by the operation button is performed when the mold apparatus is opened and closed. Therefore, the safety door is opened when the mold apparatus is opened and closed, and the human body is prevented from touching the mold apparatus or the like that is placed inside the safety door. be able to.

  Furthermore, the injection molding machine or the die casting machine according to the present invention is configured such that when the injection molding machine or the die casting machine is in an operating state and the safety door is in an open-preventing state, the mold device is not opened and closed. When the operation button is operated, the control means retracts the stopper pin to open the safety door.

  With the above configuration, even if the injection molding machine or die casting machine is in operation, if the mold is not opened and closed, it is determined that there is no risk of danger that may affect the human body. The door can be opened.

  As described above, according to the present invention, the closed safety door can be prevented from being unintentionally opened by using the stopper pin, and the opened safety door can be unintentionally closed. Can be prevented. In other words, this can prevent a part of the human body from accidentally entering the operating area where the mold opens and closes inside the safety door, and the operator can perform inspection work near the mold device. The safety door can be prevented from being opened against the operator's will because the opened safety door closes and the mold opening / closing operation etc. is started against the will of the operator. can do. Moreover, since the stopper pin can be used as both means for preventing the safety door from being closed and preventing the safety door from being opened, it is possible to provide a machine tool such as an injection molding machine or a die-casting machine with a reduced number of parts and an increase in cost.

  Furthermore, when closing the opened safety door, the protruding stopper pin can be retracted simply by operating the operation button, and the safety door can be closed, so that the safety door can be easily closed. And can be operated easily.

  In addition, if the mold device is opened and closed and there is a risk of danger, even if the operation button is operated, the closed safety door can be prevented from being opened, On the other hand, when the mold opening / closing is not performed and there is no risk of danger, the stopper pin is retracted by the operation of the operation button, and the safety door can be opened, thereby improving safety. be able to.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. Needless to say, the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

  FIG. 1 is a front view showing an injection molding machine showing an example of the present invention. The injection molding machine 1 shown in the figure can be selected and set to Japanese specifications or ANSI (American National Standard Institute) specifications according to the shipping destination. The injection unit 2 and the mold clamping unit 3 are installed on a machine base 4.

  The mold clamping unit 3 is provided with a cabinet 6 that covers the mold device 5 configured in the mold clamping unit 3, and the safety door 7 is slidable in the cabinet 6 at the entrance of the mold device 5. (The left-right direction shown in FIG. 1).

  FIG. 2 is a partially cutaway perspective view showing a safety door opening / closing control mechanism capable of preventing closing when the safety door 7 is open and preventing opening when the safety door 7 is closed. The state where the safety door 7 is prevented from being closed by the protruding stopper pin 8 is shown.

  As shown in FIG. 2, the safety door opening / closing control mechanism 10 has a stopper 11 fixed to the safety door 7, a stopper pin 8 engaged with an insertion hole 12 formed in the stopper 11, and a stopper pin 8 protruding downward. An air cylinder 14 to be engaged with the insertion hole 12 and a bracket 16 for attaching the air cylinder 14 and guiding the stopper pin 8 while sliding with the bush 15 which is an elastic member are provided. The bracket 16 is fixed to a frame 17 provided in the mold clamping unit 3 as shown in FIG. 1, and a stopper member 11a made of hard rubber, an operation button 20, which will be described later, The control means 21 and the like are configured, and the stopper member 11a is configured to come into contact with the stopper pin 8 protruding downward as shown in FIG. The door 7 is prevented from closing.

  FIG. 3 is a perspective view showing a state where the closed safety door 7 is prevented from opening so as not to open. As shown in the figure, when the safety door 7 is prevented from being opened (locked), the protruding stopper pin 8 is a stopper when the safety door 7 is closed at a predetermined position (the state shown in FIG. 3). It can function as an opening prevention means by being engaged with the 11 insertion holes 12 and can prevent the safety door 7 from being opened carelessly.

  Further, as shown in FIG. 1, the injection molding machine 1 in this embodiment is provided with an operation button 20 for projecting / retracting the stopper pin 8 through the air cylinder 14, and the mold apparatus 5 is opened and closed. When the operation button 20 is operated, the protruding stopper pin 8 is controlled not to be retracted so that the safety door 7 closed by the control means 21 is not opened. When the mold is not opened and closed, the stopper pin 8 is retracted based on the operation of the operation button 20 and the safety door 7 can be opened.

  Next, various operation modes of the injection molding machine 1 will be described below with reference to FIGS. 4A shows a safety door opening prevention state, FIG. 4B shows a safety door closing prevention state, and FIG. 4C shows a safety door opening / closing state. Further, FIG. 5 shows the operation state of the injection molding machine 1 when the ANSI specification is selected and set and the closed safety door 7 is in the state of being prevented from opening by the protruding stopper pin 8 as “operation mode”. Are shown in the left column, and the operating state of the stopper pin 8 corresponding to each mode in the left column is shown in the right column. The “OFF mode” in FIG. 5 refers to a state where the injection molding machine 1 is not in operation (the mold apparatus 5 is also stopped), and the “manual mode” refers to the state of the injection molding machine using the operation means 23. Refers to the mode in which the operation is performed manually. The “exchange mode” refers to a mode in which each operation is adjusted in one cycle at the time of setup work such as mold replacement of the mold apparatus. Refers to a mode in which the operation of the injection molding machine 1 is stopped every cycle, starting from the time of mold opening and ending when ejecting the molded body from the mold is completed. Fully automatic operation when the mold is opened and closed continuously and the molded body is repeatedly manufactured. In “manual mode” and “exchange mode”, there may be a stationary state other than during the mold opening / closing operation, that is, the mold opening / closing operation not being performed. ing.

  In the state where the safety door 7 is closed, the operation modes shown in FIG. 5 are “OFF mode”, “manual mode (except during mold opening / closing operation)”, “exchange mode (except during mold opening / closing operation)”, and “ When the mold opening is completed in the “semi-automatic mode”, as shown in FIG. 4C, the stopper pin 8 is retracted upward, so that the safety door 7 can be opened and closed (unlocked). On the other hand, in the “manual mode (during mold opening / closing operation)”, “exchange mode (during mold opening / closing operation)”, “semi-automatic mode”, and “full-automatic mode”, as shown in FIG. The stopper pin 8 protrudes downward and enters an open prevention state (lock) that prevents the safety door 7 from being opened.

  FIG. 4B shows that the stopper pin 8 protrudes in a state where the safety door 7 is opened, and the front end side of the stopper 11 comes into contact with the side surface of the stopper pin 8 to prevent the safety door 7 from closing. When the safety door 7 is opened in a state where the safety door 7 can be opened and closed (lock release state or the like), the control means 21 is connected to the stopper pin via the air cylinder 14. 8 is protruded, and the protruding stopper pin 8 obstructs the safety door 7 from being closed. Note that when the safety door 7 is prevented from being closed, regardless of the selection setting of the ANSI specification or the Japanese specification, when the safety door 7 is opened, the control means opens the stopper pin 8. Protruding and closing the safety door 7 is prevented (closed prevention state).

  Further, as described above, the injection molding machine 1 according to the present embodiment can be selected and set to the Japanese specification and the ANSI (American National Standard Institute) specification. However, when the closed safety door 7 is prevented from being opened by the protruding stopper pin 8, as described above with reference to FIG. 5, the stopper pin depends on the type of operation mode. Protruding (locking) or stopper pin retreating (unlocking) is performed. In the former case, the safety door 7 is prevented from opening, and in the latter case, the safety door 7 is openable. Therefore, when the ANSI specification is selected and set by the operation unit 24 as the country selection means, the safety door 7 is opened according to the ANSI standard, or when the Japanese specification is selected and set according to the Japanese standard. Thus, it is possible to provide a highly convenient injection molding machine 1 corresponding to the standard of the shipping destination (Japan or the United States).

  As described above, according to the injection molding machine 1 as a machine tool in the present embodiment, the stopper 11 is provided on the openable / closable safety door 7, and the stopper pin 8 is advanced and retracted by the air cylinder 14 in the insertion hole 12 provided in the stopper 11. Is provided with a safety door opening / closing control mechanism 10 that keeps the closed state (locked state) so that the safety door 7 does not open. When the safety door 7 is closed, the stopper pin 8 serves as an opening prevention means. In the state where the stopper pin 8 is not engaged with the insertion hole 12 with the safety door 7 opened, while the safety door 7 is prevented from being opened by engaging the insertion hole 12 with The protruding stopper pin 8 is also used as a closing prevention means for preventing the safety door 7 from closing. As a result, when the safety door 7 is closed, the protruding stopper pin 8 is engaged with the insertion hole 12 to prevent the safety door 7 from being opened carelessly. Thus, when the safety door 7 is opened, the protruding stopper pin 8 can prevent the safety door 7 from being closed. Accordingly, the stopper pin 8 can be used to prevent the closed safety door 7 from being unintentionally opened, and the opened safety door 7 can also be prevented from being inadvertently closed. Therefore, since the safety can be improved, and the stopper pin 8 can be used as both means for preventing the safety door 7 from being closed and for preventing the opening, a machine tool such as an injection molding machine with a reduced number of parts and an increased cost. Can be provided.

  Further, when the safety door 7 is opened and the stopper pin 8 is in a state of preventing the safety door 7 from being closed, the protruding stopper pin 8 is moved backward to switch the safety door 7 to a closeable state. Since the operation button 20 is provided, when the opened safety door 7 is closed, the operation pin 20 is operated to retract the protruding stopper pin 8 so that the safety door 7 can be easily closed with one touch. Because it is possible, it is easy to use and highly convenient.

  Further, when the injection molding machine 1 is in an operating state and the safety door 7 is in an open prevention state, “manual mode (mold opening / closing operation)”, “replacement mode (mold opening / closing operation)”, “semi-automatic mode” Alternatively, when the mold apparatus 5 is opened and closed in the “fully automatic mode” or the like, the stopper is provided so that the safety door 7 is not opened even if the operation of switching the stopper pin 8 using the operation button 20 is performed. Since the pin 8 is provided with a control means 21 that keeps protruding without being retracted, the safety door 7 can be opened by the operation button 20 when the mold device 5 is opened and closed. Even if the operation is performed, the control means 20 controls the stopper pin 8 so that the stopper door 8 is not retracted so that the safety door 7 cannot be opened. It is possible to prevent the human body from touching the mold apparatus 5 or the like that is opened and disposed inside the safety door 7, and when the safety door 7 is in the opening prevention state, the mold When the operation button 20 is operated when the apparatus 5 is not opened and closed, the control means 21 retracts the stopper pin 8 to open the safety door 7, so that the injection molding machine 1 is in an operating state. Even if the mold is not opened and closed, the control means 21 determines that there is no risk of danger that affects the human body, and the control means 21 opens the safety door 7 based on the operation of the operation button 20. Make it possible. Therefore, when the mold is opened and closed and there is a risk of danger, it is possible to prevent the closed safety door 7 from being opened even if the operation button 20 is operated. When the mold opening / closing is not performed and there is no danger of danger, the stopper pin 8 is retracted by the operation of the operation button 20 and the safety door 7 can be opened, so that the safety is further improved. be able to.

  Although one embodiment of the present embodiment has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, the machine tool of the present invention has been described by taking the injection molding machine 1 as an example. However, the machine tool is not particularly limited thereto, and it goes without saying that it may be a die casting machine having the above-described configuration.

It is a front view which shows the injection molding machine which shows an example of this invention. It is a partial notch perspective view which shows the safety door opening / closing control mechanism with which the injection molding machine was equipped same as the above. It is a perspective view which shows the state currently prevented from opening so that the closed safety door may not open. It is explanatory drawing which shows operation | movement of a safety door same as the above. It is explanatory drawing which shows the operating condition of an injection molding machine in the state in which the closed safety door is prevented from opening by the protruding stopper pin when the ANSI specification is selected and set.

Explanation of symbols

1 Injection molding machine (machine tool)
5 Mold device 7 Safety door 8 Stopper pin 10 Safety door open / close control mechanism 11 Stopper 12 Insertion hole 14 Air cylinder (cylinder)
20 operation buttons 21 control means

Claims (4)

  Provided with a safety door opening / closing control mechanism that maintains a closed state so that the safety door is not opened by providing a stopper on the openable / closable safety door and engaging a stopper pin that is advanced and retracted by a cylinder in an insertion hole provided in the stopper In the machine tool, in the state where the safety door is closed, the stopper pin is protruded as an opening preventing means and engaged with the insertion hole to prevent the safety door from being opened so as not to open. When the safety door is opened and the stopper pin is not engaged with the insertion hole, the protruding stopper pin is also used as a closing prevention means for preventing the safety door from closing. A machine tool with a control mechanism.   An operation button for reversing the protruding stopper pin and switching the safety door so that the safety door can be closed when the safety door is opened and the stopper pin is in a closed-preventing state; A machine tool comprising the safety door opening and closing control mechanism according to claim 1.   The machine tool provided with the safety door opening / closing control mechanism according to claim 2, wherein the machine tool is an injection molding machine or a die-casting machine, and the safety tool is inserted into an inlet / outlet of a mold apparatus provided in the injection molding machine or the die-casting machine. When the mold apparatus is opened and closed when the door is disposed and the injection molding machine or the die casting machine is in an operating state and the safety door is in the opening preventing state, the operation button is used. Control means for holding the stopper pin in a protruding state without being retracted so that the safety door is not opened even when the stopper pin is switched is provided.   When the injection molding machine or the die-casting machine is in an operating state and the safety door is in an opening-preventing state, the control means operates the stopper pin when the operation button is operated when the mold opening / closing of the mold apparatus is stationary. The injection molding machine or the die-casting machine according to claim 3, wherein the safety door can be opened by retreating.

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