JP3337265B2 - Rear safety door device such as injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear safety door device for a mold clamping device such as an injection molding machine or a die casting machine.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show an example of the structure of a safety door of a conventional injection molding machine. In the figure, 1 is a base, 2 is an injection device, 3 is a mold clamping device, 4 is a fixed mold plate fixed on the base, 5 is a movable mold plate, 6 is a mold clamping cylinder, and 6a is an end of the mold clamping cylinder 6. The movable mold platen 5 is moved forward and backward (moves left and right in FIG. 7) by the mold clamping cylinder 6 to perform the mold opening / closing operation by the mold clamping cylinder flange formed in the portion. Reference numeral 7 denotes a front safety door which can be smoothly opened and closed by a plurality of rollers 8 fixed to the door body, and reference numerals 9 and 10 denote upper rails and lower rails for guiding the rollers 8 of the front safety door 7, 4,
It is fixed to the mold clamping cylinder 6 and the like. Numeral 11 denotes a rear safety door, 12 and 13 denote outer and inner doors, 14 denotes an upper rail, 15 denotes a lower rail, 16 and 17 denote the upper rail 14 and the lower rail 15 by the fixed platen 4 and a mold clamping cylinder. The outer door 12 and the inner door 13 are grooved sliding pieces 12a and 13a.
And can be opened and closed by being guided by the upper rail 14 and the lower rail 15 through the opening. Since the rear safety door 11 is used less frequently, a manual angle door having a simple structure is generally used, and the outer door 12 is provided between the fixed mold plate 4 and the movable mold plate 5.
The inner door 13 covers between the movable mold platen 5 and the mold clamping cylinder flange 6a. Reference numeral 18 denotes a hose suspended between the movable die plate 5 and the clamping cylinder flange 6a to supply pressure oil to the ejector. Is provided at a position slightly larger than the main body.

[0003] In a machine such as an injection molding machine in which an extremely large force acts, a safety device for preventing the worker's body from touching a movable portion of the machine during operation is required in order to ensure the safety of the worker. . On the other hand, in the case of an injection molding machine, it is unavoidable that an operator enters a dangerous machine due to a mold changing operation, a preparation operation before operation, a product removal during operation, an abnormal inspection, and the like.

In order to cope with such demands of the machine, conventionally, in the mold clamping device 3 of the injection molding machine, the front safety door 7 and the rear portion of the rear portion are provided within a range in which the movable mold plate 5 opens and closes (forward and backward). A safety door 11 is provided.

[0005]

The rear safety door of the conventional injection molding machine has the following problems to be solved.

That is, the conventional rear safety door has a rail for guiding the door after the door is opened, particularly a lower rail, so that the mold replacement work, preparation work before operation, inspection, etc. (hereinafter referred to as mold replacement work, etc.) ), There is a problem that the lower rail is in the way and it is difficult to approach the device, and the work space is narrowed to hinder the work.

An object of the present invention is to provide a rear safety door device such as an injection molding machine having no lower rail after opening a door in order to solve the above-mentioned problems.

[0008]

The object of the present invention is to provide a rear safety door device such as an injection molding machine described in the following (1) and (2) as a means for solving the above problems.

(1) In a rear safety door device, such as an injection molding machine, which is required to close a safety door during operation for safety of a human body and to open the safety door when necessary, a pull-up which can be united to completely close an opening surface. The inner door and the outer door of the type, the hanging wheel attached to each of a plurality of locations above the inner door and the outer door, the inner door and the outer door are engaged over the required range of the opening surface by engaging the hanging wheel. An upper rail provided on the injection molding machine side above the opening surface so that it can be opened and closed,
The inner door and the outer door are provided with a short lower rail provided in a range where the lower part thereof can be prevented from pivoting outward and opening in a closed state so as not to hinder the work. Rear safety door device such as an injection molding machine.

(2) In the rear safety door device such as the injection molding machine described in the above (1), a guide rail provided at a lower portion inside the outer door in the opening and closing direction, and slidable with the guide rail. A rear safety door device, such as an injection molding machine, comprising: a groove-shaped guide piece that is engaged and is provided at a lower portion of the outer side of the joining portion of the inner door.

[0011]

The present invention is configured as described above and has the following effects.

(1) In the configuration of (1) above, a hanging wheel is attached to the upper part of the pull-in type inner door and the outer door which can be combined to close the entire opening surface, and the hanging wheel is attached. The upper door is provided with an upper rail on the injection molding machine side above the opening surface so that both the inner door and the outer door can be opened and closed over the required range of the opening surface by engaging, so both doors open and close in a suspended state It does not require a special rail for opening and closing movement at the lower side of the opening.

On the other hand, when the inner door and the outer door are closed, the lower rails are set so that the lower part of each door does not turn outward, so that the lower rail is not obstructed at the time of operation, that is, when the door is opened. Is provided, the door does not open outward (rotates around the upper rail) when the door is closed. That is, a safety door is obtained in which the entire opening is closed in an immovable state when the shield is closed, and there is no rail obstructing the working range when the door is opened.

(2) In the configuration of the above (2), a guide rail is provided in a lower part of the inside of the outer door of the rear safety door device such as the injection molding machine described in the above (1) in the opening and closing direction thereof. ,
Since the guide rail is slidably engaged with the guide rail and provided with a groove-shaped guide piece at the outer lower portion of the mating portion of the inner door, the outer door and the inner door are connected via the guide rail and the groove-shaped guide piece. The doors are freely movable in the opening and closing directions and are not separated outward, and as long as one of the doors is in the closed state, the other door does not rotate outward (the lower side can be opened). Absent).

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First and second embodiments of the present invention will be described with reference to FIGS. The same components as those in the conventional example or the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted unless necessary.

(First Embodiment) A first embodiment according to the first aspect of the present invention.
An embodiment will be described with reference to FIGS.

FIG. 1 is a front view of a rear safety door device, and FIG.
3 is a plan view thereof, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG.
FIG. In these figures, 20 is a rear safety door, 21 is its outer door, 22 is its inner door, 23 is a hanging wheel, 24 is a guide piece, 25 is a bar, and 26 is a handle. 30 is an upper rail, 31 and 32 are lower rails (however, the lower rail 32 is very short), and 33 and 34 are for fixing the upper rail 30 to a main body device (the mold clamping cylinder flange 6a side). Support members 35 and 36 are support members for fixing the lower rails 31 and 32 to the main body device, 37 is a bracket for fixing the upper rail 30 to the support member, and 38 is mounted in the upper rail 30. It is the stopper which was done.

The rear safety door 20 is an angle door having a simple structure in which expanded metal is pasted on an angle frame since the use frequency is very small as compared with the front safety door 7 shown in the conventional example. The fixed hanging wheel 23
The stop position after opening / closing is regulated by the stopper 38, respectively. The hanging wheel 23 is a known four-wheeled vehicle, and the bar 25 is for fastening the outer door 21 and the inner door 22.

The upper rail 30 has a structure in which two well-known grooved rails with lips are arranged in parallel. The lower rail 31 is a double plate rail composed of one plate of the angle and a plate material fixed to the same angle, and the lower rail 32 is a short rail using one plate of the angle. The guide pieces 24 are grooved blocks, two of which are fixedly provided at the lower ends of the outer door 21 and the inner door 22, respectively, and slidably hold the lower rail 31. As shown in FIG. 4, after the guide piece 24 is detached from the lower rail 31 or 32, both ends of the groove are widened outward so that the rail can easily enter when reengaged.

Next, the operation of the rear safety door device having the above configuration will be described.

The outer door 21 covers the open / close section of the fixed mold plate 4 and the movable mold board 5 in the closed state, opens in the direction of the movable mold board 5 when performing the work in the section, and the inner door 22 in the closed state. It covers the section between the movable mold platen 5 (position in FIGS. 1 and 2) and the mold clamping cylinder flange 6a when opened, and moves in the direction of the movable mold platen 5 to open when performing work in this section. . 1 and 2
In FIG. 2, the safety doors are in the closed position, the two-dot chain lines indicate the open positions of the outer door 21 and the inner door 22, and the movable mold board 5 is in the open position.

Since the upper part of the safety door 20 has a conventionally known configuration, the description is omitted, and the operation of the lower part of the safety door 20 will be described. When the outer door 21 is in the closed position, the outer door 2
The guide piece 24 on the lower left side of 1 is engaged with the lower rail 32, and the lower part of the outer door 21 is restrained from lateral movement at the engagement point. When the outer door 21 moves in the opening direction, the guide piece is detached from the lower rail, so that the lower part of the outer door 21 loses the restriction on the movement in the lateral direction (outward direction). , The rotational moment around the upper rail 30 generated by its own weight acts as a restoring force and suppresses it. The outer door 21 during this movement
The worker can assist by hand, if necessary, to prevent lateral swing (outward swing). As the movement further proceeds, the right guide piece 24 engages with the lower rail 31, and the lateral movement of the outer door 21 is restricted again at the engagement point. Next, the inner door 22
Is in the closed position, the lower two guide pieces 24 are engaged with the lower rail 31, so that the lower part of the inner door 22 is restrained from lateral movement at two engagement points. The inner door 2
When the door 2 moves in the opening direction, the guide piece 24 is sequentially separated from the lower rail 32, and the inner door 22 moves while being restricted from moving in the lateral direction by the restoring force based on its own weight as in the case of the outer door 21 described above. Then, this state continues as long as it is open thereafter. As described above, the lower rail at the door opening can be removed without losing the function as the safety door device.

(Second Embodiment) A second embodiment according to the second aspect of the present invention.
An embodiment will be described with reference to FIGS.

FIGS. 5 and 6 are views of the present embodiment. FIG. 5 shows the lower part of the rear safety door 20 at the joining portion, and FIG.
FIG. Other configurations are the same as in the first embodiment. In both figures, reference numeral 21a denotes a guide rail provided at the lower portion of the outer door 21 and having the same length as the lateral width. Reference numeral 24a denotes a guide piece fixed to the lower end of the joining portion of the inner door 22, and slides the guide rail 21a by a groove. It is movably sandwiched and engaged.

Next, the operation of the above configuration will be described.

Since the guide rail 21a at the lower part of the outer door 21 and the guide piece 24a at the lower part of the combination of the inner door 22 shown in FIGS. 5 and 6 are always engaged, as long as the inner door 22 is in the closed position,
Even if the outer door 21 moves to any position, the lateral movement is indirectly restricted by the lower rail 31 via the inner door 22. Also, as long as the outer door 21 is in the closed position, the inner door 22 can be moved to any position through the lower door 3 via the outer door 21.
2, the movement in the lateral direction (outward rotation) is indirectly restricted. Therefore, the lateral movement of the lower part of the safety door 20 is not always released from the regulation of the lower rail 31 or 32 as in the case described above.

As described above, according to the first and second embodiments,
In order to perform a mold changing operation or the like, even if the bar 25 is removed and the rear safety door 20, specifically the outer door 21 or the inner door 22 is opened,
These doors are configured to move while being hung by a suspension wheel 23, and the lower opening has only lower rails 31 and 32 near both ends which do not hinder the work. As described above, there is an advantage that the lower rail does not obstruct the mold replacement work or other work or product removal.

[0028]

The present invention has the following effects (1) and (2) because it is configured as described above.

(1) When the safety door is opened, since there is no lower rail at the opening, it is possible to easily approach the apparatus when performing a mold changing operation or the like, and a work space is widened and workability is improved.

(2) Since there is no lower rail at the opening, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a rear safety door device according to a first embodiment of the present invention,

FIG. 2 is a plan view of the first embodiment,

FIG. 3 is a sectional view taken along the line AA of FIG. 1;

FIG. 4 is a view taken in the direction of arrow B in FIG. 1;

FIG. 5 is a front view of a summing unit according to a second embodiment of the present invention,

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

FIG. 7 is a front view showing an attached state of a conventional rear safety door device.

FIG. 8 is a sectional view taken along the line II of FIG. 7;

[Explanation of symbols]

 Reference Signs List 3 mold clamping device 4 fixed mold plate 5 movable mold plate 6a mold clamping cylinder flange 21 outer door 21a guide rail 22 inner door 23 hanging wheel 24, 24a guide piece 30 upper rail 31, 32 lower rail

Claims (2)

(57) [Claims] Claims: 1. A pull-down type which can be closed and closed over the entire opening surface in a rear safety door device such as an injection molding machine in which a safety door is closed during operation for safety of a human body and an opening is required as required. Inner doors and outer doors, hanging wheels attached to a plurality of locations above the inner doors and outer doors, and engaging the hanging wheels to open and close the inner doors and outer doors over a required range of the opening surface. An upper rail movably provided on the side of the injection molding machine above the opening surface, and the lower part of the inner door and the outer door can be prevented from pivoting outward when the door is closed and obstructing work during operation. A rear safety door device such as an injection molding machine, comprising: a short lower rail provided in a range where the rear safety door is not provided. 2. The rear safety door device according to claim 1, wherein a guide rail is provided at an inner lower portion of the outer door in an opening and closing direction thereof, and slidably engages with the guide rail. And a groove-shaped guide piece provided at a lower portion of the outer side of the joining portion of the inner door.