JP3715495B2 - Safety doors for injection molding machines, etc. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety door of an injection molding machine or the like that is provided in front of an injection molding machine, a die casting machine, or the like so as to be slidable in a reciprocating direction of a movable plate and opens and closes independently.
[0002]
[Prior art]
9 and 10 show an example of a safety door of a conventional injection molding machine.
The mold clamping mechanism of the injection molding machine includes a fixed platen 1 to which one of a pair of molds 6 is fixed, a movable platen 2 that is provided opposite to the fixed platen 1, a fixed platen 1, and an end plate. And a toggle mechanism 7 that is extended and retracted by a clamping cylinder fixed to the movable platen 2 and the end plate to move the movable platen 2 forward and backward with respect to the fixed platen 1. Prepare.
On the front surface of the injection molding machine or the like, a safety door 3 such as an injection molding machine or the like that is provided so as to be slidable in the reciprocating direction of the movable platen 2 and that opens and closes independently is provided. A fixed cover 4 is provided in front of the toggle mechanism 7. The fixed cover 4 has a size that does not block the mold 6 between the fixed platen 1 and the movable platen 2 even when the movable platen 2 is moved to the maximum leftward in FIG.
Next, the operation will be described.
FIG. 9 shows a state where the movable platen 2 is opened and the safety door 3 is closed. In a state where the safety door 3 is closed, the mold 6 and the toggle mechanism 7 are blocked by the fixed cover 4 and the safety door 3, so that the hand and the body cannot be put into the mold 6 and the toggle mechanism 7. .
From this state, holding the door handle 5 and sliding the safety door 3 leftward in the figure, the safety door 3 opens to the maximum opening limit position a as shown in FIG. When the safety door 3 is opened to the maximum opening limit position a, a hand or body insertable part B exists between the toggle mechanism 7 and the movable platen 2.
When working with a hand or a part of the body inserted into this insertable part b, if the toggle mechanism 7 is mechanically operated due to a malfunction of the machine itself and the movable platen 2 is closed, There is a risk that the body will be pinched.
For this reason, as shown in FIG. 11, a safety door 3 having a structure in which a stop plate 8 is attached to the movable platen 2 and a stopper 9 is provided on the safety door 3 has been devised. As shown in FIG. 12, when the safety door 3 is opened with the movable platen 2 moved and opened, the stopper 9 comes into contact with the stop plate 8, so the safety door 3 opens more than the open position of the movable platen 2. I can't. As described above, by limiting the opening stroke of the safety door 3, it is possible to prevent a hand or body from being inserted into the insertable portion b.
[0003]
[Problems to be solved by the invention]
Since the safety door 3 of the conventional injection molding machine is configured so that a hand or body cannot be inserted into the insertable portion b by limiting the opening stroke of the safety door 3, the safety door 3 can be moved. When it is desired to open the panel 2 more than the open position, there is a problem that the stop plate 8 must be removed from the movable panel 2 or the stopper 9 must be removed from the safety door 3. When the safety door 3 is desired to be opened from the position where the movable platen 2 is opened, for example, when exchanging the mold 6, the user connects the ejector connecting portion 10 to perform the connection work or applies grease to the toggle mechanism 7. This is the case of supplying a lubricant.
[0004]
For this reason, in the conventional safety door 3, in the case of this operation | work, the stop plate 8 or the stopper 9 must be removed each time, and there exists a problem that work efficiency falls.
[0005]
For this reason, some users who frequently change molds have troublesome steps to remove and attach the stop plate 8 or stopper 9, and therefore may use the injection molding machine with the stop plate 8 or stopper 9 removed. .
[0006]
However, when the stop plate 8 or the stopper 9 is removed, the safety door 3 can be opened to the maximum opening limit position a as shown in FIG. When working with a hand or part of the body in the insertable part B, there is a problem that there is a risk of injury by being caught in the toggle mechanism 7 due to a malfunction of the injection molding machine.
[0007]
The present invention solves such a problem and provides a safety door for an injection molding machine that can open a safety door without removing a stop plate or a stopper when it is desired to open the safety door rather than the opening position of the movable platen. To do.
[0008]
Further, the present invention provides a safety door for an injection molding machine that can make the injection molding machine inoperable when the stroke for opening the safety door is set larger than the opening position of the movable platen.
[0009]
[Means for Solving the Problems]
In the first aspect of the present invention, the mold platen reciprocates the movable platen that is paired with the fixed platen, and the resin is injected from the injection device into the mold cavity between the fixed platen and the movable platen. In the safety door of an injection molding machine etc. that is slidable in the reciprocating direction of the movable plate on the front of an injection molding machine etc. that molds and takes out the molded product and opens and closes independently,
Install a stopper on the safety door,
The movable plate is provided with a stop plate that controls the opening stroke of the safety door by contacting the stopper of the safety door.
When the stop plate can be switched between a position where it comes into contact with the stopper of the safety door and a position where it does not come into contact, and the stop plate is set so that the safety door opens beyond the limit of opening of the movable plate, an injection molding machine Provided with an interlocking mechanism that disables the operation and the like .
[0010]
According to a second aspect of the present invention, in the safety door of the injection molding machine or the like according to the first aspect, the stop plate is slidable between a position where it comes into contact with a stopper of the safety door and a position where it does not come into contact. Features.
[0012]
According to a third aspect of the present invention, in the safety door of the injection molding machine or the like according to the first or second aspect , the interlock mechanism includes a cam plate disposed on the stop plate and a stop plate disposed on the movable platen. Characterized in that it comprises a limit switch that is turned on when it comes to a position that does not contact the stopper of the safety door, and a control circuit that disables the operation of the injection molding machine or the like when the limit switch is turned on. To do.
[0013]
According to a fourth aspect of the present invention, in the safety door of the injection molding machine or the like according to any one of the first to third aspects, an elongated hole is formed in the movable plate in the sliding direction of the stop plate, and the engagement is within the elongated hole. The position of the stop plate is fixed by fastening means such as a combined wing nut.
[0014]
In the claims 5 invention described in the safety doors such as injection molding machine according to claim 1 or 2, wherein the interlock mechanism is characterized in that a sensor of a contactless manner.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
FIG. 1 is a front view showing an injection molding machine according to an embodiment of the present invention, and shows a state where a safety door is closed in a movable platen opened state. 2 is a view showing a state where the safety door is partially opened in the movable plate open state, FIG. 3 is a view showing a state where the safety door of FIG. 1 is opened beyond the movable plate opening limit position, and FIG. It is an enlarged front view which shows the state which the stop plate of this and the stopper of the safety door contact | abutted. 5 is a side view showing the state seen from the right direction in FIG. 4, FIG. 6 is a side view showing the state seen from the left direction in FIG. 4, and FIG. 7 is a plan view in which the stop plate in FIG. FIG. 8 is a side view showing a state viewed from the right direction of FIG. 6. In addition, the same code | symbol is attached | subjected to the structure similar to a prior art example, and the description is abbreviate | omitted.
[0017]
The injection molding machine of the present embodiment reciprocates the movable platen 2 that is paired with the fixed platen 1 by a mold clamping device, and injects resin from the injection device into the cavity in the mold 6 to form a molded product. A safety door 3 that is slidable in the reciprocating direction of the movable platen 2 and can be opened and closed independently is provided on the front surface of the injection molding machine.
[0018]
A stopper 9 is attached to the safety door 3 so as to protrude toward the movable platen 2, and the movable plate 2 is a stop plate that controls the opening stroke of the safety door 3 by contacting the stopper 9 of the safety door 3. 12 is disposed. Further, according to the present invention, the stop plate 12 can be switched between a position where it comes into contact with the stopper 9 of the safety door 3 and a position where it does not come into contact.
[0019]
The stop plate 12 is slidable between a position approaching the safety door 3 and a position away from the safety door 3. Specifically, as shown in FIG. 5, the stop plate 12 is attached so that the bracket 11 is attached to the movable platen 2 and is slidable with respect to the bracket 11.
[0020]
As shown in FIG. 5, the bracket 11 has a U-shaped notch that allows the stopper 9 to pass through on the side surface on the safety door 3 side. When the stop plate 12 is positioned on the safety door 3 side, the stop plate 12 is in contact with the stopper 9 of the safety door 3, and when it is slid to the right in the figure, the stop plate 12 is not in contact with the stopper 9 shown in FIG. It becomes.
[0021]
As shown in FIG. 4, the upper and lower ends of the stopper plate 12 are bent in a U-shape, and the U-shaped folds provided at the corresponding positions of the bracket 11 and on both edges of the U-shaped notch are provided. It is locked to the curved part. A long hole is opened from the safety door 3 side to the center part below the U-shaped cut portion of the bracket 11, and fastening means such as a wing nut 14 is engaged in the long hole, so that the stop plate 12 is connected from the bracket 11 side. The stop plate 12 can be fixed at an arbitrary position by tightening the wing nut 14.
[0022]
Further, according to the present invention, when the stop plate 12 is set so that the safety door 3 opens beyond the opening limit position of the movable platen 2, an interlock mechanism is provided that makes the injection molding machine or the like inoperable.
[0023]
As shown in FIGS. 5 and 6, the interlock mechanism is disposed at the upper end of the stop plate 12 on the side opposite to the safety door 3, and is provided with a cam plate 15 having an inclined portion and the bracket 11. The limit switch 13 is arranged so that the switch is turned on when it slides to the opposite side of the safety door 3, and the operation of the injection molding machine is disabled when the limit switch 13 is turned on. And a control circuit (not shown). The limit switch 13 is disposed on the upper side of the movable platen 2 opposite to the safety door 3.
[0024]
In the present embodiment, the interlock mechanism is the limit switch 13 and the cam plate 15, but is not limited to this, and may be a contactless detection sensor. Further, although the stopper plate 12 is slid in the horizontal direction, it may be slid in the vertical direction or in an oblique direction. Further, the stop plate 12 can be moved not only to slide but also to turn at a predetermined radius.
[0025]
The operation of this embodiment will be described below.
[0026]
When it is desired to open the safety door 3 rather than the opening position of the movable platen 2, as shown in FIGS. 7 and 8, as shown in FIGS. The wing nut 14 is tightened and fixed with no contact. In this state, the stopper plate 12 is slid, and the stopper plate 12 is not present at the U-shaped cutout portion of the bracket 11 which becomes the track of the stopper 9 of the safety door 3. Therefore, the safety door 3 can be opened to the maximum opening limit position a without contacting the 12.
[0027]
At this time, as shown in FIGS. 7 and 8, the cam plate 15 attached to the stop plate 12 is in a state in which the limit switch 13 is hit, that is, the switch is turned on, so that the interlock of the control circuit acts. Thus, the injection molding machine becomes inoperable. In this state, the insertable portion B shown in FIG. 3 exists, but the operator can operate the ejector connection portion 10 or perform a lubricant supply operation to the toggle mechanism 7 in a safe state.
[0028]
When the work is completed, the wing nut 14 is loosened again, and the stopper plate 12 is slid toward the safety door 3 as shown in FIGS. 5 and 6, and the wing nut 14 is tightened and fixed. In this state, even if the safety door 3 is opened beyond the opening position of the movable platen 2, the stop plate 12 is positioned in the U-shaped notch of the bracket 11 on the track of the stopper 9 of the safety door 3. Therefore, the stopper 9 comes into contact with the stop plate 12 and the safety door 3 cannot be opened beyond the position where the movable platen 2 is opened. At this time, since the limit switch 13 is separated from the cam plate 15 of the stop plate 12, the cam plate 15 does not hit the limit switch 13. Therefore, the interlock of the control circuit does not act, and the injection molding machine is in an operable state.
[0029]
【The invention's effect】
As described above, in the invention according to the first aspect of the present invention, the stopper plate is provided on the safety door, and the stop plate for controlling the opening stroke of the safety door by bringing the movable plate into contact with the stopper of the safety door. Since the switch can be switched between the position where the stop plate abuts against the stopper of the safety door and the position where it does not abut, the safety door can be switched to the position where the movable panel is open or more and the maximum opening limit. It is possible to open to the position, and the operator can operate the ejector connecting portion, perform a lubricant supply operation, and the like. Furthermore, when the stop plate is set so that the safety door opens above the opening limit of the movable platen, the structure is provided with an interlock mechanism that disables the operation of the injection molding machine, etc. Even when the safety door is opened, the accident caused by the operation of the injection molding machine or the like can be prevented.
[0030]
In the invention according to claim 2, the stopper plate is slidable between a position where it comes into contact with the stopper of the safety door and a position where it does not come into contact with the stopper. It is possible to switch between a contact position and a non-contact position.
[0032]
According to a third aspect of the present invention, the interlock mechanism is configured such that the switch is turned on when the cam plate provided on the stop plate and the stop plate provided on the movable plate are not in contact with the stopper of the safety door. Since the limit switch is turned on and the control circuit that disables the operation of the injection molding machine when the limit switch is turned on, the operation of the injection molding machine etc. is performed when the limit switch is turned on and off depending on the slide position.・ Stop switching is possible.
[0033]
According to a fourth aspect of the present invention, an elongated hole is formed in the movable plate in the sliding direction of the retaining plate, and the position of the retaining plate is fixed by fastening means such as a wing nut engaged in the elongated hole. Since the structure is adopted, the stopper plate can be easily slid or fixed by loosely tightening the wing nut.
[0034]
In the invention according to claim 5 , since the interlock mechanism is a contactless detection sensor, the interlock mechanism can be operated reliably.
[Brief description of the drawings]
FIG. 1 is a front view showing an injection molding machine according to an embodiment of the present invention, and shows a state where a safety door is closed with a movable platen opened.
FIG. 2 is a view showing a state where a safety door is opened in a movable plate open state.
3 is a view showing a state in which the safety door of FIG. 1 is opened beyond a movable plate opening limit position. FIG.
4 is an enlarged front view showing a state where a stopper plate of FIG. 1 and a stopper of a safety door are in contact with each other. FIG.
5 is a side view showing a state viewed from the right direction of FIG. 4;
6 is a side view showing a state viewed from the left direction of FIG. 4;
7 is a side view showing a state in which the stop plate of FIG. 5 is slid rightward.
8 is a side view showing a state viewed from the right direction of FIG. 6;
FIG. 9 is a view showing a conventional safety door and a state where the safety door is closed when the movable platen is open.
10 is a view showing a state where the safety door is opened in the movable plate open state of FIG. 9; FIG.
FIG. 11 is a view showing another conventional safety door and showing a state where the safety door is closed when the movable platen is open.
12 is a view showing a state where a safety door is opened in the movable plate open state of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed platen 2 Movable platen 3 Safety door 4 Fixed cover 5 Door handle 6 Mold 7 Toggle mechanism 9 Stopper 10 Ejector connection part 11 Bracket 12 Stop plate 13 Limit switch 14 Wing nut 15 Cam plate

Claims (5)

The mold clamping device reciprocates the movable platen (2) paired with the fixed platen (1), and injects resin or the like from the injection device into the mold cavity between the fixed platen (1) and the movable platen (2). In a safety door (3) of an injection molding machine or the like that is slidable in the reciprocating direction of the movable plate on the front surface of an injection molding machine or the like that molds and takes out a molded product, and opens and closes independently.
Install a stopper on the safety door (3),
The movable plate (2) is provided with a stop plate (12) for controlling the opening stroke of the safety door (3) by contacting the stopper (9) of the safety door (3),
The stop plate (12) can be switched between a position where it abuts against the stopper (9) of the safety door (3) and a position where it does not abut .
When the stop plate (12) is set so that the safety door (3) opens beyond the opening limit of the movable platen (2), an interlock mechanism is provided that makes the injection molding machine inoperable. Safety doors such as injection molding machines.   The injection molding machine or the like according to claim 1, wherein the stopper plate (12) is slidable between a position in contact with the stopper (9) of the safety door (3) and a position not in contact with the stopper (9). Safety door. The interlock mechanism is arranged when the cam plate (15) disposed on the stop plate (12) and the stop plate (12) disposed on the movable plate are not in contact with the stopper of the safety door (3). A limit switch (13) which is switched on at
The safety door of an injection molding machine or the like according to claim 1 or 2, comprising a control circuit that disables the operation of the injection molding machine or the like when the limit switch (13) is turned on.   An elongated hole is formed in the movable plate (2) in the sliding direction of the retaining plate (12), and the position of the retaining plate (12) is fixed by fastening means such as a wing nut (14) engaged in the elongated hole. The safety door for an injection molding machine or the like according to any one of claims 1 to 3, wherein the safety door is formed.   The safety door for an injection molding machine or the like according to claim 1 or 2, wherein the interlock mechanism is a contactless detection sensor.

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