JP4081492B2 - Safety door device for injection molding equipment - Google Patents

Description

  The present invention relates to a safety door device for an injection molding device.

Conventionally, an injection molding apparatus has been widely used as a molding apparatus for rubber products and resin products.
The injection molding apparatus is provided with a safety cover that surrounds the apparatus main body for safety. This safety cover has an opening at the front position above the floor above the predetermined height position to take out the molded product, set the metal fitting in the molding die, or perform other work, A lower front cover forming a part of the safety cover is provided below the safety cover.

Conventionally, this lower front cover has been provided in a fixed state for safety and cannot be opened and closed.
At the height of the other opening, a multi-optical axis photoelectric sensor having a plurality of light projecting parts on both the left and right sides of the opening and a light receiving part facing these light projecting parts is an area sensor of the safety device. When the device is in operation, the photoelectric sensor is on, and when the operator's hand enters the opening, the photoelectric sensor detects this and automatically stops the device. Or sound an alarm.

This opening is also used for maintenance work of the device. When maintenance work is required, the photoelectric sensor is turned off and the operator performs maintenance inside the device through the opening. It was like that.
However, in the maintenance work through the opening, there has been a problem that the worker cannot enter the inside of the safety cover and the maintenance work is difficult to perform.
The present invention has been devised to solve such problems.

In addition, as a prior art for the present application, in Patent Document 1 below, a safety cover is provided at an opening for exchanging a mold of an injection molding machine, and the molding operation is performed with the safety cover closed during the operation of the injection molding machine. An injection molding machine has been disclosed in which a safety cover is slid to open when a mold is changed so that an operator can work safely.
However, this safety cover is for opening and closing the opening, and is different from the front lower cover which is the subject of the present invention. Therefore, the one disclosed in Patent Document 1 is the subject of the present invention. Are different and different inventions.

JP 2003-25405 A

  The present invention provides a safety door device for an injection molding apparatus capable of performing the same work with good workability when maintenance work is necessary while ensuring safety, against the background of the above circumstances. It was made as a purpose.

  Thus, the first aspect of the present invention is a part of a safety cover that surrounds the apparatus main body of the injection molding apparatus, and a front lower cover that is located below the front working opening is provided at the end in the left-right direction. A rotary door that can be opened and closed that rotates around an axis, and a portion that is located on the back side of the door and that is located on both sides in the left-right direction with respect to the opening, a light projecting portion and a light receiving portion And a light shielding plate, which is in a state of shielding light from the photoelectric sensor when opened, and in a non-light shielding state when closed, is provided in a state of rotating integrally with the door. Is configured as a safety door.

  According to a second aspect of the present invention, in the first aspect, the photoelectric sensor is provided in a portion located at an upper portion of the door.

Effects and effects of the invention

  As described above, the present invention is a portion located below the opening of the safety cover that surrounds the main body of the injection molding apparatus, which is a rotary door that can open and close the front lower cover, and is located on the back side of the door. A photoelectric sensor is provided in the part located on both sides in the left and right direction with respect to the opening, and the light of the photoelectric sensor is shielded when the door is opened, and the light shielding plate that is not shielded when the door is closed rotates integrally with the door. According to the present invention, the front lower cover on the lower side of the opening that has been conventionally provided as a rotary door is a rotary door. When maintenance is required, opening the door (safety door) allows the operator to put the entire body inside the safety cover to work, greatly improving the workability of the maintenance work. Improve It is Mel possible.

  On the other hand, if the front lower cover is configured as a door that can be opened and closed in this manner, there is a risk that the front lower cover, that is, the door is accidentally opened during operation of the apparatus.

Therefore, in the present invention, a photoelectric sensor is provided on the back side of the door comprising the front lower cover, and the door is configured as a safety door by providing a light-shielding portion that blocks the light of the photoelectric sensor when opened. Yes.
Therefore, if the door consisting of the front lower cover is accidentally opened while the apparatus is in operation, the safety apparatus automatically operates to stop the apparatus or issue a warning, thereby ensuring safety.

  Next, according to a second aspect of the present invention, the photoelectric sensor is provided in a portion located at an upper portion of the door. In this case, the photoelectric sensor for the opening provided at both lateral positions of the opening is slightly lower as it is. The photoelectric sensor for the safety door can be configured easily by extending to

  Or, conventionally, the photoelectric sensor as an area sensor for the opening is usually provided extending below the lower end position of the opening, and in this case, the photoelectric sensor for the safety door Even if it does not provide especially, the effect which can utilize the photoelectric sensor for openings provided conventionally as a photoelectric sensor for safety doors as it is is acquired.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the overall configuration of an injection molding apparatus, which includes an apparatus main body having an injection apparatus 10 and a molding apparatus 12, and a safety cover 13 surrounding the apparatus main body.
The injection device 10 plasticizes and fluidizes the injection pot 14 and the ribbon-like rubber material by the rotation of the screw, and pushes the extruder 16 into the injection pot 14 and the rubber material filled in the injection pot 14 in the figure. The plunger 18 which injects from the injection pot 14 by the downward advance movement, and the drive cylinder 20 are provided.
The injection device 10 moves the plunger 18 forward and injects the rubber material in the injection pot 14 toward the lower mold 24.

The molding device 12 includes a mold clamping device 22 and a molding die 24.
In FIG. 1, reference numeral 25 denotes a hydraulic device in the mold clamping device 22.
In this embodiment, the forming die 24 has an upper and lower divided structure of an upper die 26, a thin plate-like middle die 28, and a lower die 30.
A heat plate 36 is provided below the lower mold 30, a heat insulating plate 38 is provided below the heat plate 36, and a first slide plate 40 is provided below the heat plate 36.
Reference numeral 42 denotes a movable plate that moves up and down at the molding position to raise or lower the middle die 28 and the lower die 30 together with the hot plate 36, the heat insulating plate 38, and the like.

As shown in FIG. 1, the first slide plate 40 extends rearward (leftward in the figure), and collectively accommodates wiring connected to the heater embedded in the hot plate 36 on the end thereof. A wiring box 44 is provided, and a second slide plate 46 that also serves as a lid for the wiring box 44 is provided above the wiring box 44.
The second slide plate 46 extends further to the left in the drawing from the wiring box 44.

In the present embodiment, the first slide plate 40, the wiring box 44, and the second slide plate 46 as a whole constitute a slide member 47.
A slide member 47 composed of the first slide plate 40, the wiring box 44, and the second slide plate 46 is moved forward and backward in the left-right direction in FIG.
On the other hand, a table 50 is provided at the front part (right part in FIG. 1) of the molding apparatus 12, and a mold separating apparatus 52 for separating the middle mold 28 and the lower mold 30 in the molding mold 24 is provided on the table 50. Is provided.

The mold separating device 52 has a pair of a lifting cylinder 54, a lifting rod 56 that is driven to lift up and down, and a lifting member 58 provided at the upper end thereof on both right and left sides in a direction perpendicular to the paper surface of FIG.
A claw member 60 is further provided above the elevating members 58, and the claw members 60 are moved up and down integrally with the elevating member 58.

In this embodiment, the mold 24 is held in the mold-clamped state by the mold-clamping device 22 shown in FIG. 1, and in this state, the plunger 18 is protruded downward in the figure by the drive cylinder 20 to fill the injection pot 14. The fluidized rubber material is injected into the cavity of the mold 24.
And by hold | maintaining for the predetermined time in that state, the rubber material inject | poured into the cavity is vulcanized and becomes a rubber product.

Thereafter, the middle mold 28 and the lower mold 30 in the mold 24 are lowered, and the slide member 47 is advanced from the left to the right in FIG. 1 at the lowered end, and the slide member 47 is described in detail on the first slide plate 40. The placed middle mold 28 and lower mold 30 are both brought on the table 50.
That is, the middle mold 28 and the lower mold 30 are moved from the molding position to the mold separation position.

The mold separating device 52 subsequently raises the lifting rod 56 by the lifting cylinder 54.
Then, a pair of holding claws (not shown) holding the middle mold 28 are lifted together to lift the middle mold 28 upward and separate the middle mold 28 from the lower mold 30.
Thereafter, the product held in the middle mold 28 is taken out of the injection molding apparatus after being separated from the middle mold 28 or the middle mold 28.

As shown in FIG. 2, the safety cover 13 is provided with an opening 68 at a predetermined height from the floor at the front position, here above the height of about 90 cm from the floor. On the both sides in the left-right direction of the opening 68, a multi-optical axis photoelectric array composed of a large number of light projecting sections and a corresponding number of light receiving sections arranged opposite to the light projecting sections. A sensor 70 is provided as an area sensor of the safety device.
Here, the upper end of the opening 68 is about 200 centimeters from the floor.
In the figure, reference numeral 72 denotes a light projecting unit having a light projecting unit connected vertically on the left side of the opening 68. Reference numeral 74 denotes a light receiving unit formed by connecting light receiving units vertically at a predetermined pitch on the right side of the opening 68. Represents a unit.
Here, the light projecting unit 72 is arranged on the left side and the light receiving unit 74 is arranged on the right side. However, there is no problem even if the arrangement is reversed.

The photoelectric sensor 70 as an area sensor of the safety device works as follows.
The photoelectric sensor 70 is in a state where a light curtain is formed between the light projecting unit 72 and the light receiving unit 74 when the light emitted from the light emitting unit is received by the light receiving unit while the apparatus is in operation.
When an operator's hand or object is inserted into the opening 68 in this state, light is blocked by the insertion, and the light receiving unit does not receive light from the light emitting unit. As a result, it is detected that an operator's hand or an object has entered the opening 68. Based on this detection, the safety device is activated and the device is stopped or an alarm is issued at the same time.

  In FIG. 2, the front lower cover at the lower part of the opening 68 in the safety cover 13 is connected to the frame 78 by a hinge shaft 76 at the left and right ends, here the right end, and the front lower cover is opened and closed. It is configured as a possible safety door 80.

The photoelectric sensor 70 is provided in such a form that the lower part thereof extends to the upper part of the safety door 80 at the rear side position of the safety door 80.
On the other hand, the safety door 80 is provided with a light shielding plate 82 that rotates integrally with the safety door 80 as shown in FIG.
Here, the light shielding plate 82 is provided in a form that partially protrudes in the upper part of the safety door 80 and in the direction of the plate surface of the safety door 80.
The light shielding plate 80 is provided at a position overlapping with the lower part of the photoelectric sensor 70 in the vertical direction.

When the safety door 80 is closed as shown in FIGS. 4B and 4I, the light shielding plate 82 does not block the light of the photoelectric sensor 70, but is shown in FIGS. 4B and II. Thus, when this is opened, that is, when the safety door 80 is opened, the light shielding plate 82 protrudes to the upper side in the drawing, that is, the apparatus main body side, and the light of the photoelectric sensor 70 is blocked.
Therefore, if the safety door 80 is opened while the device is in operation and the photoelectric sensor 70 is in the on state, the light shielding plate 82 blocks the light from the photoelectric sensor 70, so that the safety device operates and the device is stopped.

  As described above, according to the present embodiment, the front lower cover below the opening 68 that has been provided in a fixed manner is the rotary safety door 80, so that maintenance of the apparatus main body is required. When the door (safety door) 80 is opened, the operator can work by putting the entire body inside the safety cover 13, which can greatly improve the workability of the maintenance work. it can.

On the other hand, if the front lower cover, that is, the safety door 80 is accidentally opened during the operation of the device, the light from the photoelectric sensor 70 on the back side of the safety door 80 is blocked by the light shielding plate 82. It works to stop the device and issue a warning, thereby ensuring safety.
In addition, since the photoelectric sensor 70 is provided in a portion located at the upper part of the safety door 80, the photoelectric sensor 70 for the opening provided at both lateral positions of the opening 68 is slightly extended as it is. Thus, the photoelectric sensor 70 for the safety door 80 can be configured easily.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, in the present invention, the light shielding plate 82 is provided not in the upper end portion of the safety door 80 but in the middle portion in the vertical direction, and a photoelectric sensor can be provided in a position opposite to this. In addition to the injection molding machine, the present invention can be applied to various types and forms of injection molding machines other than the above examples, and various modifications are made without departing from the scope of the present invention. It can be configured in the form.

It is a front view which shows the whole structure of an example of the injection molding apparatus which is an application object of this invention. It is a front view of the safety door apparatus in FIG. It is operation | movement explanatory drawing of the embodiment. FIG. 4 is an operation explanatory view different from FIG. 3 of the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Injection apparatus 12 Molding apparatus 13 Safety cover 68 Opening part 70 Photoelectric sensor 72 Light projection part unit 74 Light-receiving part unit 76 Hinge shaft 80 Safety door 82 Light-shielding plate

Claims (2)

  A part of the safety cover that surrounds the device main body of the injection molding device, and the front lower cover located below the front working opening can be opened and closed to rotate around the axis at the left and right ends And a photoelectric sensor having a light projecting part and a light receiving part at a part located on the back side of the door and located on both sides in the left-right direction with respect to the opening. Is provided with a light shielding plate that is in a state of shielding the light of the photoelectric sensor when opened, and in a state of rotating integrally with the door while being in a non-light shielding state when closed, and the door is configured as a safety door. A safety door device for an injection molding device.   2. The safety door device for an injection molding apparatus according to claim 1, wherein the photoelectric sensor is provided in a portion located at an upper portion of the door.

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