JPH06297534A - Rear part safety door device for injection molding machine or the like - Google Patents

Abstract

PURPOSE:To obtain a rear part safety door device without any lower rail which is not a hindrance to exchange of a metal mold by a method wherein a short lower part rail is provided within a range which is not a hindrance in working so that lower parts of an inner door and an outer door can not pivot outward under a state wherein they are closed. CONSTITUTION:When an outer door 21 is in a closed position, a guide piece 24 at a left side lower part of the outer door 21 is engaged with a lower part rail 32, and a lower part of the outer door 21 is restricted in lateral motion at an engaged point. When the outer door 21 moves in an opening direction, angular moment around an upper rail 30 generated by self-weight when a safety door is going to incline outward by unexpected external force acts as restoring force, and restricts movement. When an inner door 22 is at a closed position, a lower part of the inner door 22 is restricted in lateral motion at two engaged points since two guide pieces 24 at the lower part are engaged with a lower rail 31. Since the lower rail does not exist at an opening part thus when the safety door is opened, when exchanging the metal mold or the like is carried out, an operator can easily approach a device, and an operating space is widened to improve its workability.

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. With the mold clamping cylinder flange formed in the section, the movable mold plate 5 is moved forward and backward (moved left and right in FIG. 7) by the mold clamping cylinder 6 to perform the mold opening and closing operation. Reference numeral 7 is a front safety door that can be smoothly opened and closed by a plurality of rollers 8 fixed to the door body, and 9 and 10 are upper rails and lower rails that guide the rollers 8 of the front safety door 7, which are fixed mold plates. 4,
It is fixed to the mold clamping cylinder 6 and the like. Reference numeral 11 is a rear safety door which is a pull, and 12 and 13 are outer doors and inner doors thereof, 14 is an upper rail, 15 is a lower rail, 16 and 17 are the upper rail 14 and the lower rail 15, and the fixing plate 4 and the mold clamping cylinder. The outer door 12 and the inner door 13 are support members for fixing to the flange 6a, and the outer door 12 and the inner door 13 are groove-shaped sliding pieces 12a and 13a.
It can be opened and closed by being guided by the upper rail 14 and the lower rail 15 via the. Since the rear safety door 11 is used infrequently, a manual angle door having a simple structure is generally used, and the outer door 12 is provided between the fixed mold board 4 and the movable mold board 5,
The inner door 13 covers between the movable die plate 5 and the die clamping cylinder flange 6a. Reference numeral 18 denotes a hose suspended between the movable die plate 5 and the die clamping cylinder flange 6a for supplying pressure oil to the ejector. Due to the presence of this hose 18, the rear safety door 11 is provided with the die clamping device 3 It is provided at a position that is slightly larger than the main body.

In a machine such as an injection molding machine which exerts an extremely large force, a safety device is required to prevent the worker's body from touching the moving parts of the machine during operation 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 a worker enters a dangerous machine due to mold replacement work, preparatory work before operation, product removal during operation, or abnormality inspection.

In order to meet 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 part are provided in the range in which the movable mold plate 5 opens and closes (reverses and moves) the mold. A safety door 11 is provided.

[0005]

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

That is, in the conventional rear safety door, since there is a rail for guiding the door after opening the door, especially a lower rail, mold replacement work, preparatory work before operation, inspection, etc. (hereinafter, mold replacement work, etc.). That is, the lower rail interferes with the operation and makes it difficult to approach the device, and the work space is narrowed to hinder the work.

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

[0008]

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

(1) In a rear safety door device such as an injection molding machine, which is required to close the safety door during operation for safety of the human body and to open it as needed, a pulling which can be united to shield the entire opening surface. -Type inner and outer doors, suspension cars attached to each of the upper and lower parts of the inner and outer doors, and the suspension cars are engaged to open the inner and outer doors over the required range of the opening surface. 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 that does not hinder the work so as to prevent the lower portions of the inner door and the outer door from rotating outward and opening. A rear safety door device for injection molding machines.

(2) In the rear safety door device such as the injection molding machine described in the above (1), a guide rail provided in the inner lower portion of the outer door in the opening / 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 with and is provided on an outer lower portion of a summing portion of the inner door.

[0011]

Since the present invention is constructed as described above, it has the following actions.

(1) In the configuration of (1) above, a suspension car is attached to the upper part of the sliding inner door and the outer door which can be united to shield the entire opening surface. Since the upper rail is provided on the injection molding machine side above the opening surface so that both the inner door and the outer door can be opened / closed by engaging and over the required range of the opening surface, both doors can be opened / closed in a suspended state. It does not require a special rail for opening and closing movement on the lower side of the opening.

On the other hand, when the inner door and the outer door are closed, the lower rails do not rotate outward so that the lower rails do not interfere with the work during work, that is, when the door is open. Since the door is provided, the door does not open outward (rotate around the upper rail) when closed. That is, a safety door can be obtained in which the entire opening is immovably closed when closed, and there is no interfering rail in the work range when opened.

(2) In the configuration of (2) above, a guide rail is provided in the lower inside portion of the outer door of the rear safety door device such as the injection molding machine described in (1) above in the opening / closing direction. ,
Since the groove-shaped guide piece is provided at the outer lower portion of the summing portion of the inner door slidably engaged with the guide rail, the outer door and the inner door are provided through the guide rail and the groove-shaped guide piece. , Opening and closing movements are mutually free, and there is no separation in the outward direction, as long as one door is closed, the other door does not rotate outward (the lower side may open). Absent).

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The 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 example are designated by the same reference numerals, and the description thereof will be omitted unless necessary.

(First Embodiment) The first aspect of the invention according to claim 1
An embodiment will be described with reference to FIGS.

FIG. 1 is a front view of a rear safety door device, and FIG.
1 is a plan view thereof, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG.
FIG. In these drawings, 20 is a rear safety door, 21 is its outer door, 22 is also an inner door, 23 is a suspension wheel, 24 is a guide piece, 25 is a barb, and 26 is a handle. Further, 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 the main body device (the mold clamping cylinder flange 6a side). A support member, 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 a mount member in the upper rail 30. It is a stopper.

Since the rear safety door 20 is used less frequently than the front safety door 7 shown in the conventional example, it is an angle door having a simple structure in which expanded metal is stuck to the angle frame, and both ends of the upper portion are covered. The fixed suspension wheel 23
Are suspended by the upper rails 30 and stop positions after opening and closing are regulated by the stoppers 38, respectively. The suspension wheel 23 is a known four-wheel 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 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 groove-shaped blocks, two of which are fixed to the lower ends of the outer door 21 and the inner door 22, respectively, and slidably sandwich the lower rail 31. As shown in FIG. 4, the guide piece 24 has its both ends widened outward so that the rail can be easily inserted when the guide piece 24 is disengaged from the lower rail 31 or 32 and then engaged again.

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

The outer door 21 covers the open / close section of the fixed mold board 4 and the movable mold board 5 in the closed state, opens in the direction of the movable mold board 5 when working on 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 when performing work in this section, it moves toward the movable mold platen 5 and opens. . 1 and 2
Shows the two safety doors in the closed position, the two-dot chain lines show the open positions of the outer door 21 and the inner door 22, and show the movable die plate 5 in the open position.

Since the upper portion of the safety door 20 has a conventionally known structure, its explanation is omitted, and the operation of the lower portion 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 portion of the outer door 21 is restrained from lateral movement at the engaging point. When the outer door 21 moves in the opening direction, the guide piece is disengaged from the lower rail, so that the lower portion of the outer door 21 loses the regulation against the lateral (outward) movement, but the safety door moves outward due to an unexpected external force. When leaning toward, the rotational moment around the upper rail 30 generated by its own weight acts as a restoring force and suppresses it. In addition, the outer door 21 during this movement
If necessary, the worker can assist with the lateral shake (outward shake). When 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 engaging point. Next, the inner door 22
Since the two lower guide pieces 24 are engaged with the lower rail 31 when the is in the closed position, the lower portion of the inner door 22 is restrained from lateral movement at two engaging points. The inner door 2
When 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 the lateral movement is restricted by the restoring force based on its own weight as in the case of the outer door 21. However, this state continues while it is opened. As described above, the lower rail of the door opening can be removed without losing the function of the safety door device.

(Second Embodiment) Second embodiment according to the invention of claim 2
An embodiment will be described with reference to FIGS.

5 and 6 are views of this embodiment. FIG. 5 shows the lower part of the assembling part of the rear safety door 20, and FIG. 6 shows CC of FIG.
A sectional view is shown. Other configurations are similar to those of the first embodiment. In both figures, 21a is a guide rail provided at the lower part of the outer door 21 and having the same length as the lateral width, and 24a is a guide piece fixed to the lower end of the summing portion of the inner door 22, and the guide rail 21a is slid in the groove. It is movably sandwiched and engaged.

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

Since the lower guide rail 21a of the outer door 21 and the guide lower piece 24a 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.
The outer door 21 is indirectly restricted in lateral movement by the lower rail 31 via the inner door 22 no matter what position the outer door 21 is moved to. Further, as long as the outer door 21 is in the closed position, the inner door 22 may be moved to any position through the lower rail 3 through the outer door 21.
The lateral movement (outward rotation) is indirectly regulated by 2. 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 mold replacement work, etc., even if the bar 25 is removed and the rear safety door 20, more specifically, the outer door 21 or the inner door 22 is opened,
These doors are configured to move in a state of being suspended by a suspension vehicle 23, and the lower opening has only lower rails 31 and 32 near both ends that do not hinder work. As described above, there is an advantage that the lower rail does not interfere with the work of exchanging molds and other work, and taking out products.

[0028]

Since the present invention is constructed as described above, it has the following effects (1) and (2).

(1) When the safety door is opened, since there is no lower rail in the opening, it is possible to easily approach the device when performing mold replacement work, etc., and the work space is widened to improve workability.

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

[Brief description of 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.

FIG. 4 is a view on arrow B of FIG.

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

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a front view showing a mounting state of a conventional rear safety door device,

8 is a cross-sectional view taken along the line II of FIG.

[Explanation of symbols]

 3 Mold clamping device 4 Fixed mold board 5 Moving mold board 6a Mold clamping cylinder flange 21 Outer door 21a Guide rail 22 Inner door 23 Suspended vehicle 24, 24a Guide piece 30 Upper rail 31, 32 Lower rail

Claims (2)

[Claims] 1. In a rear safety door device, such as an injection molding machine, in which a safety door is closed during operation for the purpose of personal safety and is required to be opened when necessary, a sliding type which can be united to shield the entire opening surface. Inner door and outer door, and suspension wheels attached to the upper and lower parts of the inner door and outer door, and the suspension vehicles are engaged to open and close the inner and outer doors over the required range of the opening surface. The upper rail movably provided on the injection molding machine side above the opening surface and the lower parts of the inner and outer doors can be prevented from rotating outward and opening when the door is closed. A rear safety door device, such as an injection molding machine, comprising a short lower rail provided in a range that does not satisfy the above condition. 2. A rear safety door device for an injection molding machine or the like according to claim 1, wherein a guide rail is provided at a lower inside portion of the outer door in the opening / closing direction, and slidably engaged with the guide rail. And a rear safety door device for an injection molding machine or the like, characterized in that the rear safety door device is provided with a groove-shaped guide piece provided on the lower outer side of the assembly portion of the inner door.