JPS6350063Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a safety door for molding equipment such as an injection molding machine and a die-casting machine, and more specifically to a molding equipment or an accessory device such as an operation panel for the molding equipment installed near the molding equipment. This invention relates to a safety door for a molding device that is constructed so that even if an operator's hand or the like is caught between the door and the safety door, an accident that may cause bodily harm will not occur.

A safety door for a molding apparatus has a structure as shown in FIGS. 1 to 3, for example.

That is, in FIGS. 1 to 3, the safety doors indicated by numerals 1 and 1a are on the operation side, and the ones indicated by numerals 2 and 2a are the safety doors on the non-operation side.

These safety doors 1, 1a and 2, 2a are arranged in parallel with the forming device 3 in between, respectively.
Each safety door 1, 1a, 2, 2a has a plurality of wheels 6 that roll on a rail 5, and the upper end side has a plurality of guide rollers 8 that roll in contact with a guide rail 7. And these doors 1, 1a, 2, 2a
Each of the rails 5 and 7 is configured to be able to be opened and closed independently, and as shown in FIG. 3, each of the rails 5 and 7 has two tracks formed in parallel. One end of the lower rail 5 is fixed to the outer end of the support frame 9, as shown in FIG. 3, and the inner end of the support frame 9 is fixed to the fixed platen 4 of the forming device 3. There is. The other end of the rail 5 and the middle thereof are supported on a foundation 36 by a plurality of supports 10.

Further, the upper rail 7 is connected to a beam 12 via a support frame 11, and furthermore, the upper rail 7 is connected to a beam 12 via a support frame 11.
is fixed at one end to the fixed platen 4, and the other end is fixed to the column 1.
It is supported and fixed on 4. Beam 12, 12
The space between them is connected by a connecting frame 13.

As shown in FIGS. 1 and 3, the safety door 1, which is slidably attached to the operating side movable plate 37 and fixed plate 4 side, is connected at its upper end to the tip of the piston rod 38a of the cylinder 38. The opening/closing operation is performed by operating the cylinder 38. In addition, cylinder 3
8 is attached to the support frame 11 via a bracket 11a.

The other safety doors 1a, 2, 2a are configured to be opened and closed manually.

Note that numerals 37a and 4a indicate a movable die and a fixed die, respectively, and 14 indicates a column.

The safety doors 1 and 2 are designed for safety when the movable platen 37 and the movable mold 37a attached to the movable platen 37 move relative to the fixed die 4a attached to the fixed platen 4, When the mold 37a and the fixed mold 4a are clamped and molten metal is injected into the mold, the phenomenon that the molten metal sometimes blows out from the gap between the mating surfaces of the molds occurs, but this is provided to prevent this. be.

On the other hand, the safety doors 1a and 2a are provided for safety when a toggle portion (not shown) connecting the fixed platen 40 and the movable platen 37 is operated.

The safety doors 1a, 2, and 2a may be kept closed at all times during operation, but the safety gate 1 is used during operations such as removing molded products from the cavities of the molds 37a and 4a, and applying mold release agent to the cavities. Therefore, it is necessary to open it every time the molding operation is completed. For this reason, the safety door 1 on the side closer to the operating molds 37a, 4a is configured to be automatically opened and closed by the cylinder 38. The opening/closing sequence of the safety door 1 is normally as follows. That is,
When the operation start button on the operation panel 15 of the molding device 3 is pressed, the cylinder 38 is activated and the safety door 1 is closed. After this closing operation is completed, the movable platen 37 starts moving forward in the direction of the fixed platen 4, and the molds 37a and 4
a is clamped. Thereafter, an injection cylinder (not shown) is operated, and the molten metal is injected into the cavities of the molds 37a, 4a and cast. When this molding operation is completed, first, the movable platen 37 is separated from the fixed platen 4 side, and the molds 37a and 4a are opened.
After this, the safety door 1 opens. And the mold 37a,
The molded product is taken out of the device 3 from the cavity 4a. After this, a mold release agent is applied to this cavity, and the next molding operation begins. Thereafter, the safety gate 1 repeats the same operation. A control circuit is constructed so that all of the above operating sequences can be performed automatically.

In a molding device equipped with such a safety door 1, near the end 39 of the main body of the safety door 1 on the operating side,
An operation panel 15 attached to the fixed platen 4 is located, and an operator operates this operation panel 15 to operate the molding apparatus.

However, as shown in Figures 1 and 2,
There is only a small gap c between the end 39 of the safety door 1 and the operation panel 15 when the safety door 1 is closed, and there is a danger that the human body such as the operator's hands may be caught.

Therefore, a safety device has conventionally been attached to the end portion 39 of the safety door 1.

This safety device has conventionally been constructed as shown in FIGS. 4 and 5.

That is, a hollow support frame 16 is provided at the end 39 of the safety door 1 on the operation panel 15 side, and a rod 17 is slidably mounted on the support frame 16 in the horizontal direction with a bush 40.
A touch fitting 18 having a U-shaped cross section is fixed to the outer end of the rod 17. A compression spring 21 is elastically loaded between a spring receiver 19 fixed to the inner surface of the touch fitting 18 and a spring receiver 20 fixed to the support frame 16 side, so that the touch fitting 18 moves away from the safety door 1. It gives them a migratory habit.

A stopper 22 is attached to the inner end of the rod 17 at a position beyond the support frame 16 to restrict the movement of the rod 17 outward, that is, to the outside of the end 39 of the safety door 1. A contact piece 2 bent into a hook shape on the outside of the stopper 22
One end of 3 is fixed.

On the other hand, a limit switch 24, which is a position detection device for the touch fitting 18, is fixed to the outer surface of the inner end of the support frame 16, and the other end of the contact piece 23 is in contact with an actuator 25 of the limit switch 24. .

That is, when the touch fitting 18 is at its forward limit, the contact piece 23 is in contact with the actuator 25 of the limit switch 24, and the limit switch 24 is in an on state.

Therefore, when the operator's hand or the like is caught between the touch fitting 18 and the operation panel 15, the touch fitting 18 resists the elastic force of the compression spring 21 and closes the safety door 1.
Retracts toward the main body, and the contact piece 23 is connected to the actuator 2.
5, the limit switch 24 is turned off, and it is possible to detect that the operator's hand is caught. Therefore, by actuating the cylinder 38 via the control circuit in response to the off signal of the limit switch 24 to stop the forward movement of the safety door 1 and move the safety door 1 backward in the opening direction, there will be a gap between the safety door and the control panel 15. It is possible to prevent the risk of an accident in which the operator's hands, etc. are pinched.

However, in the conventional structure as described above, the touch fitting 18 is supported by, for example, two upper and lower rods 17, so the movement of the touch fitting 18 may be caused to move in parallel depending on which part the operator's hand or the like touches. There may be cases where this is no longer the case. That is, for example, when the operator's hand is caught below the touch fitting 18, a pressing force is applied only to the lower part of the touch fitting 18, and the lower rod 17
is retracted against the compression spring 21, but the upper rod 17 does not retreat together with the lower rod 17. One of the reasons for this is that when a pressing force is applied below the touch fitting 18, a rotational moment is generated around the spring receiver 20 of the upper rod 17, which forces the upper rod 17 to become horizontal. This is because it will not be possible to move to

In such a case, the contact piece 23 cannot be separated from the actuator 25 with good response, and a time difference occurs before the cylinder 38 is actuated via the control circuit.

If this time difference occurs, the safety door will move forward by that amount, and the touch fitting 18 will not be able to perform its original function, and there is a risk that the operator's hands etc. will be caught. Furthermore, if the touch fitting 18 is forcibly moved as described above, the touch fitting 18 will not return to its original normal position and the actuator 25 will remain off, making it impossible to continue the molding operation. This caused work efficiency to deteriorate. Furthermore, if the bushing 40 is operated in this manner, the bushing 40 will be worn out and the sliding part with the rod 17 will be loose, causing inconvenience.

This invention was made to eliminate the above-mentioned drawbacks of the conventional technology.No matter which part of the touch fitting is touched by the operator, the touch fitting will operate reliably and the safety gate will open with excellent response. An object of the present invention is to provide a safety door for a molding device configured to be able to immediately stop the operation of the molding device.

In this invention, in order to achieve the above purpose,
Two links are provided rotatably via a first pin, separated by a predetermined distance in the longitudinal direction of the end of the safety door body that is slidably attached to the molding device, and the links are rotated in the same direction. There is a second
The touch fitting is pivotally supported via the pin located outside the end of the safety door body, and each link is connected to the line connecting the first and second pins of each link, the first The line connecting the pins and the second
The lines connecting the pins form a parallelogram, and each link has contact surfaces for locking the touch fitting facing toward the end of the safety door body at both ends, and this contact The contact surface of the end of the surface on which the second pin is attached is in such a state that the contact surface of the end of the side where the first pin is attached is in contact with the end of the safety door body. A member is formed at a position with a predetermined gap from the end of the safety door body and applies force to pull the touch fitting outward from the end of the safety door body. A structure is adopted in which a position detection device for detecting the position of the touch metal fitting is provided between the touch metal fitting and the touch metal fitting.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIGS. 6 and 7 illustrate one embodiment of the present invention. In each figure, the same parts as in FIGS. 1 to 5 are designated by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, a caul plate 27 is fixed via bolts 26 to the outer side of the support frame 16 formed at the end 39 of the safety door 1 on the operation panel 15 side. Two pairs of brackets 28 are provided on the outer surface of the bracket 28, spaced apart from each other by a predetermined distance above and below.
A pair of upper and lower brackets 28 are provided in parallel and projecting perpendicularly from the backing plate 27 with a slight spacing between them. Between the upper and lower brackets 28 and 28, a link 29 bent in a dogleg shape is arranged with its lower bent portion rotatably supported by a first pin 30. Furthermore, the touch fitting 18 is attached to the upper end of each link 29 in the same direction via a second pin 31 so that the touch fitting 18 is located outside the end 39 of the safety door 1. Supported and installed.

A torsion coil spring 32 is wound around the first pin 30, one end of which contacts a protrusion 29a protruding between the first and second pins 30 and 31 of the link 29, and the other end of the torsion coil spring 32. It is in contact with a protruding piece 28a protruding from one of the brackets 28, giving the link 29 the ability to rotate clockwise in FIG. It gives you the power to stick out.

Each of the upper and lower links 29 has a line that connects the first pin 30 and the second pin 31 of each link 29, a line that connects the first pins 30 of the upper and lower links 29, and a line that connects the first pin 30 and the second pin 31 of each link 29, and 2 pin 3
It is constructed so that the lines connecting the two pieces form a parallelogram. Each link 29 has contact surfaces 29c and 29b formed at its upper end and lower end for contacting the backing plate 27, respectively, and the upper end side, that is, the second pin 31 is attached. The abutting surface 29c at the end of the side is such that the abutting surface 29b at the lower end, that is, the end to which the first pin 30 is attached, abuts against the backing plate 27 of the end 39 of the safety door 1. The backing plate 27 of the end 39 of the safety door 1 in the state
The touch fittings 18 are formed at positions with a predetermined gap to ensure a movable distance. On the other hand, a support stand 3 is placed near the upper end of the end 39 of the safety door 1.
3 is fixed to the backing plate 27, and this support base 3
3 is a limit switch 34 which is a position detection device.
is installed, and this limit switch 34
The actuator 35 faces a position where it comes into contact with a striker 18a fixed inside near the upper end of the touch fitting 18.

Next, the operation of this embodiment configured as above will be explained.

When the operator's hand or the like does not touch the touch fitting 18, that is, under normal conditions, the touch fitting 18 is moved by the elastic force of the torsion coil spring 32 and the weight of the touch fitting 18, causing the link 29 to move as shown in FIG. Since the touch fitting 18 is rotated in the direction about the first pin 30, the touch fitting 18 is in a state of protruding outward from the end portion 39 of the safety door 1 body to the maximum extent. That is, it is in the state shown in FIG. In this state, the contact surface 29b at the lower end of the link 29
7, and restricts the clockwise rotation limit of the link 29, that is, the protrusion limit of the touch fitting 18. The actuator 35 of the limit switch 34 is at its limit of rotation in the counterclockwise direction in FIG. 6, and is in contact with the striker 18a, so that the switch is in an OFF state.

When the operation start button on the operation panel 15 of the molding device 3 is pressed in this state, the cylinder 38 is activated and the safety door 1 moves forward in the closing direction. If the operator's hand or the like comes into contact with the touch fitting 18 or gets caught between the touch fitting 18 and the operation panel 15, the touch fitting 18 will be pushed toward the safety door 1 and the second pin 31 will be pushed. The upper and lower links 29 are the first
The pin 30 is rotated counterclockwise in FIG. 6 against the elastic force of the torsion coil spring 32.

Note that the upper and lower links 29, 29 are configured in the same way as parallelogram links via the touch fitting 18, so no matter where the operator touches the touch fitting 18 in the vertical direction, the safety door will close. There is always a parallel movement with respect to 1, and there is no deviation of either the top or bottom.

When the touch fitting 18 moves a predetermined distance toward the safety door 1, the actuator 3 of the limit switch 34
5 is rotated clockwise in FIG. 6, the limit switch 34 is turned on, and this signal causes the cylinder 38 to stop operating via a control circuit (not shown), and then immediately starts operating in the opposite direction. By doing so, the safety door 1 stops its closing operation and starts its opening operation.

In this way, no matter where the operator touches the touch fitting 18, the touch fitting 18
always causes parallel movement with respect to the safety door 1, and the limit switch, which is a position detection device, immediately and reliably detects this and can stop the closing operation of the safety door, making it extremely safe.

The limit of movement of the touch fitting 18 toward the safety door 1 is such that when the link 29 is rotated counterclockwise about the first pin 30, the upper contact surface 29c of the link 29 touches the backing plate 27. It is regulated at the moment of contact.

The state in which the touch fitting 18 has moved to its limit is shown by a two-dot chain line in FIG.

By the way, in the above embodiment, the touch fitting 18 is projected from the end of the safety door 1 using the torsion coil spring 32, but
Instead of the torsion coil spring 32, for example, a plurality of compression coil springs may be arranged in parallel at upper and lower positions between the backing plate 27 and the end inner wall of the touch fitting 18.

As is clear from the above description, since the present invention has the configuration as described in the claims for utility model registration, it has the following excellent effects.

(1) The touch metal fitting only needs to be rotated by overcoming the elastic force of the spring, so the touch metal fitting can be easily and smoothly retreated from the safety door body, so the operation is reliable.

(2) No matter where the operator touches the touch fitting in the vertical direction, the touch fitting always moves parallel to the safety door body, so the position detection device that detects the position of the touch fitting is reliably activated. be able to.

(3) A touch metal fitting position detection device is installed between the safety door body and the touch metal fitting, so if the operator touches the touch metal fitting, the safety door can be opened automatically, preventing any harm to the human body. There is no.

(4) Unlike conventional safety gates, there are no malfunctions caused by the touch fittings being twisted or poor guides, and
Since there are no sliding parts such as guide parts, there is no wear of parts and the touch fittings operate reliably.

(5) Since a link mechanism is used, the structure is extremely simple, resulting in fewer failures and can be manufactured at low cost.

[Brief explanation of the drawing]

Figures 1 to 3 explain the installation procedure of the safety door body. Figure 1 is a plan view, Figure 2 is a front view of Figure 1, Figure 3 is a right side view of Figure 2, Figures 4 and 5 explain the conventional touch fitting mounting structure, with Figure 4 being a partially enlarged longitudinal sectional front view, Figure 5 being a sectional view taken along the line V-V in Figure 4, Figures 6 and 5. FIG. 7 illustrates an embodiment of the present invention, in which FIG. 6 is an enlarged longitudinal sectional front view and FIG. 7 is a right side view of FIG. 6. 1, 1a, 2, 2a...safety door body, 15...
Operation panel, 16... Support frame, 18... Touch metal fittings,
27...Packing plate, 28...Bracket, 29...
Link, 30... first pin, 31... second pin, 32... torsion coil spring, 34... limit switch, 35... actuator, 38...
Cylinder.

Claims (1)

[Claims for Utility Model Registration] (1) Two links separated by a predetermined length in the longitudinal direction of the end of a safety door slidably attached to a molding device are rotated through respective first pins. A touch metal fitting is pivotally supported on one end side of each link in the same direction via a second pin, and is located outside the end of the safety door body, and each link is The lines connecting the first and second pins of each link, the lines connecting the first pins, and the lines connecting the second pins form a parallelogram, and both ends of each link has an abutment surface for locking the touch fitting facing toward the end of the safety door body, and of this abutment surface, the abutment surface at the end on the side where the second pin is attached is connected to the first end. The contact surface of the end on which the pin is attached is in contact with the end of the safety door body and is located at a position with a predetermined gap from the end of the safety door body. Features include a member that applies force to pull the metal fitting outward from the end of the safety door body, and a position detection device that detects the position of the touch metal fitting between the safety door body and the touch metal fitting. Safety gate for molding equipment. (2) A spring is interposed between the link and the safety door body, centering on the first pin, as a member that applies a force to pull the touch fitting outward from the end of the safety door body. A safety door for a molding device according to claim 1, wherein a touch metal fitting is attached to the safety door body in a resilient manner.