JP5391307B2 - Safety door device for injection molding machine - Google Patents

Description

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

The injection molding machine includes a mold clamping unit that attaches a mold, opens and closes the mold with a predetermined force and speed, and an injection unit that melts and kneads resin pellets and injects molten resin into the mold. .
When attaching a mold to the mold clamping part, manually removing the molded product, replacing the cylinder assembly of the injection part, supplying resin pellet material to the injection part, and maintaining the mold clamping part and injection part In the case of maintenance, etc., it is necessary to make the mold clamping unit and the injection unit accessible from the outside.
However, since the mold clamping part opens and closes the mold and the injection part injects the molten resin at high temperature and high speed, there is a danger to the operator if it is left exposed. Therefore, safety measures are taken in which safety doors are provided in the mold clamping part and the injection part so that each mechanism part can operate only when the safety door is closed.

  Normally, a safety door used in an injection molding machine has a structure that slides in a horizontal direction as shown in FIG. 8. In this case, a support roller (not shown) is attached to the safety door 16, and Rails parallel to the horizontal direction that serve as the machine frame of the machine are provided at the upper and lower parts to guide the support rollers. Reference numeral 28 denotes a conventional upper guide rail provided in the upper part.

  However, in this structure, since the conventional upper guide rail 28 is installed across the operator's work space 29, the upper guide rail 28 remains when the safety door 16 is opened, and the upper guide rail 28 is clamped. This has been a hindrance when accessing the injection section and the injection section, reducing the work efficiency and safety of the operator.

Patent Documents 1 to 4 disclose slide door technologies that do not interfere with the work of an operator in an injection molding machine.
Patent Document 1 is a method of using a slide pack instead of a rail in order to delete an upper rail exposed in a work space in a sliding safety door. One end of the cantilever slide pack is fixed to the machine frame, and the upper part of the safety door is attached to the movable member of the slide pack.
In Patent Document 2, in order to delete the upper rail exposed in the working space in the sliding safety door, the upper rail is provided only on the opening side of the safety door, and the guide bar is provided at the opening side end of the safety door. Is a method in which the guide rod is guided to the upper rail. The upper part of the safety door is supported by this guide bar, and rolls are suppressed.

In Patent Document 3, in a sliding safety door of a mold clamping unit, a fixed cover formed so as to cover the mold clamping drive device is provided in order to remove the upper rail exposed in the work space, and its outer peripheral surface is set to a predetermined level. A safety door that covers the space is provided, and support rollers attached to the top, side, and bottom of the safety door come in contact with the fixed cover and the machine frame to support the weight of the safety door without rails. And prevents rolling.
Patent Document 4 is a method that is employed when the lower rail, not the upper rail, gets in the way in a sliding safety door. A rail is provided at the upper part over the entire movable range of the safety door, the safety door is suspended from the upper rail by a suspension car, and the lower rail is provided at the left and right ends of the range that does not disturb the operator at the lower part, The lower rail supports the safety door when the safety door is in a closed state and almost fully open. If the safety door is moved from the closed state to the opening direction, the safety door will be detached from the lower rail, so the lateral direction will be lost and rolling will occur when external force is applied. , Rolls converge.

  As another method, it is known that a hinge is used for the safety door so as to turn in a horizontal plane. If a hinge is used, a rail becomes unnecessary and a working space can be secured. However, if the machine is relatively large, the safety door also becomes large, and this swivel structure requires a large space around the machine just for turning the safety door. Furthermore, a robust structure that can withstand the weight of the safety door is required, which increases the cost.

JP-A-7-205250 Japanese Utility Model Publication No. 6-86917 JP 2003-39521 A JP-A-6-297534

In the technology disclosed in Patent Document 1, since the safety door is prevented from rolling only by the slide pack, the slide pack needs to have high rigidity, and it is necessary to secure the same movable range as the stroke of the safety door. Therefore, the slide pack becomes expensive and the cost increases.
In the technique disclosed in Patent Document 2, as the safety door is moved in the closing direction, the guide rod extends a long distance from the upper rail, and the safety door becomes unstable. In particular, the closed safety door is not stable, and rolls at the top. Further, since the safety bar protrudes to the open side, the opening / closing stroke of the safety door is limited in order to avoid interference with the fixed cover.
In the technology disclosed in Patent Document 3, since the safety door is integrated from the front side to the back side of the machine, the weight of the safety door increases, and the burden on the operator increases. The burden is particularly great when the molded product is taken out manually.
In the technique disclosed in Patent Document 4, since the upper rail remains, the upper rail exposed in the work space cannot be deleted. Also, if the rail structure of Patent Document 4 is turned upside down and the upper rail is deleted, the safety door is supported at the lower part and the upper part becomes a free end, so the safety door cannot be stabilized during opening and closing. . If this is to be stabilized, it is necessary to use a high-rigidity linear motion mechanism for the lower guide member, which increases costs.

  Therefore, in view of the above-described problems of the prior art, the present invention eliminates the upper rail exposed in the work area in the sliding safety door and improves the work efficiency and safety of the worker, It is another object of the present invention to provide a safety door device for an injection molding machine having a structure that makes the injection part easily accessible from the outside, the closed safety door is stable without rolling, and does not increase the cost. .

In the invention according to claim 1 of the present application, in the injection molding machine, guided members are attached to the upper and lower portions of the safety door, and the safety door slides horizontally by the upper and lower guide members parallel to the horizontal direction. The upper guide member is divided into two, and is divided into a front guide member arranged in the closing direction of the safety door and a rear guide member arranged in the opening direction. The front guide member and the rear guide member Are arranged in a straight line, and the safety door has an upper guided member, a first guided member at the end in the closing direction of the safety door, and a second guided member at the end in the opening direction of the safety door. These guided members are guided by the upper guide member, and are always guided by the rear guide member in the second guided member. When the safety door is closed, the first guided member is The front guide member has a first The guided members are safe door device for an injection molding machine, characterized by being supported respectively on said rear guide member.
In the invention according to claim 2, in the injection molding machine, guided members are attached to the upper and lower parts of the safety door, and the safety door can be slid horizontally by the upper and lower guide members parallel to the horizontal direction. The upper guide member is divided into two, and is divided into a front guide member arranged in the closing direction of the safety door and a rear guide member arranged in the opening direction. The front guide member and the rear guide member are straight The safety door has a first guided member at the end in the closing direction of the safety door and a second guided member at the end in the opening direction of the safety door. A third guided member is provided between the center portion of the safety door and the second guided member, and these guided members are guided by the upper guide member, and are always rearward in the second guided member. Guided by the guide member, the safety door is closed In the state, the first guided member to the front guide member, the second guided member is a safety door device of an injection molding machine, characterized by being supported respectively on said rear guide member.
According to a third aspect of the present invention, in the process of opening the safety door, the third guided member is inserted into the rear guiding member before the first guided member is detached from the front guiding member, The safety door device for an injection molding machine according to claim 2, wherein the safety door device is arranged as described above.
According to a fourth aspect of the present invention, in addition to the guided member attached to the lower part of the safety door and the lower guiding member that supports the guided member, a third guiding member is provided on the upper, lower, or side of the lower guiding member The safety door device for an injection molding machine according to any one of claims 1 to 3, wherein a guided member is additionally provided.

  According to the present invention, in the slide type safety door, the upper rail exposed in the work area is deleted, the mold clamping part and the injection part can be easily accessed from the outside, and the closed safety door does not roll. It is possible to provide a safety door device for an injection molding machine that is stable and does not increase the cost.

It is a front view of an injection molding machine. It is a figure which shows the state which opened the safety door attached to the injection part. It is a figure explaining embodiment provided with the 1st and 2nd guided member. It is the figure which looked at the arrow direction from the AA line of FIG. It is a figure explaining embodiment provided with the 1st, 2nd, and 3rd guided member. It is an enlarged view of the part of the safety door of FIG. It is the figure which looked at the arrow direction from the BB line of FIG. It is a figure of the state which opened the safety door with the safety door apparatus of the conventional injection molding machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same or similar components as those in the description of the prior art will be described using the same reference numerals.
FIG. 1 is a front view of an injection molding machine. In the injection molding machine 1, the mold clamping unit 7 and the injection unit 8 are usually disposed on the machine base 2 so as to face each other. The mold clamping unit 7 and the injection unit 8 have a large number of mechanical working parts, and the movement of each member is strong and fast and dangerous to the operator. It is covered with a cover such as the cover 14 to isolate it from the worker (see FIG. 2). Reference numeral 15 denotes a fixed platen cover that covers the fixed platen 12.

  In the replacement work of the mold 9 and the cylinder assembly 10, the clamp space (between the movable platen 11 and the fixed platen 12) and the swivel space (the front plate of the fixed platen 12 and the injection unit 8 (not shown) in the mold clamping unit 7. ))) Is required. Therefore, the cover of these space portions is a safety door 16 and can be opened and closed unlike the other fixed covers 13 and 14. The safety door 16 is provided with a safety door window 16b so that the inside can be visually recognized. In addition, since the safety doors 16 and 16 attached to the mold clamping part 7 and the injection part 8 can be made into the same or similar structure, the safety door 16 attached to the injection part 8 is demonstrated as an example below.

FIG. 2 is a view showing a state where the safety door 16 attached to the injection unit 8 is opened. Reference numeral 19 denotes a front guide rail, and reference numeral 29 denotes an operator's work space. FIG. 3 is a view seen from the back of FIG. 2 and is a view for explaining an embodiment including a first roller and a second roller. FIG. 4 is a view of the direction of the arrow as seen from the line AA in FIG.
In FIG. 3, in accordance with the spirit of the present invention, the machine base 2, the machine frame (the machine frame in the left-right direction 3, the machine frame in the vertical direction 4, the machine frame in the front-rear direction 5, the machine frame 6 in the middle support), and the fixed cover (Fixed cover 13 at the end, fixed cover 14 at the side), fixed platen cover 15, safety door 16, guide rail of the safety door 16 (upper guide rail 17 (front guide rail 19, rear guide rail 20), lower guide rail 18) and only the configuration relating to the rollers (first roller 23, second roller 24).

  A first roller 23 is attached to the end in the closing direction, and a second roller 24 is attached to the end in the opening direction as a support roller on the upper side of the inner surface of the safety door 16. Further, a lower roller 22 (a lower roller (horizontal support) 22a, a lower roller (vertical support) 22b) is attached to the lower part of the inner side surface of the safety door 16 (see FIG. 4). The lower roller (horizontal support) 22a and the lower roller (vertical support) 22b are attached to at least two places of the safety door 16 in the closing direction and the opening direction.

An upper guide rail 17 and a lower guide rail 18 that are parallel to the horizontal direction are attached to a vertical machine frame 4, an intermediate support machine frame 6, and a fixed platen cover 15 as support guide rails that are guide members on the upper and lower parts. The safety door 16 is supported and slidable in the horizontal direction.
The upper guide rail 17 is divided into two and separated into a front guide rail 19 arranged in the closing direction of the safety door 16 and a rear guide rail 20 arranged in the opening direction. The front guide rail 19 and the rear guide rail 20 are in a straight line. Is arranged. One end of the front guide rail 19 in the closing direction of the safety door 16 is fixed to the fixed platen cover 15. Both ends of the rear guide rail 20 are fixed to the vertical machine casing 4 and the intermediate supporting machine casing 6. The distance 30 between the opposite ends of the front guide rail 19 and the rear guide rail 20 should be as long as possible so as not to interfere with the operator. The working efficiency is improved even if the distance is sufficient to pass.

  The rollers 23 and 24 attached to the end of the safety door back surface 16a folded back on the upper side of the safety door 16 are attached to the upper rail (the front guide rail 19 or the rear guide rail 20) as shown in FIGS. Guided. The rollers 22 a and 22 b are guided by the lower guide rail 18. Thus, when the safety door 16 is in the closed state, the first roller 23 is supported by the front guide rail 19 and the second roller 24 is supported by the rear guide rail 20, and the lower roller (horizontal support) 22a, (vertical support). 22b is supported by the lower guide rail 18, and suppresses the shaking of the safety door 16 in the closed state.

  In the process of opening the safety door 16, the second roller 24 is always accommodated in the rear guide rail 20, and the lower rollers (horizontal support) 22a and (vertical support) 22b attached at least two places are always Even if the safety door 16 is in the middle of opening, it is supported by the lower guide rail 18 so that the roller is guided to the guide rail at three locations, the lower two locations and the upper one location. it can.

Next, an embodiment including first, second, and third guided members will be described with reference to FIGS. FIG. 6 is an enlarged view of the safety door portion of FIG. FIG. 7 is a view of the arrow direction from the BB line of FIG.
Supporting rollers are attached to the upper and lower parts of the safety door 16 as guided members, and an upper guide rail 17 and a lower guide rail 18 that are parallel to the horizontal direction are provided on the machine frame to support the safety door 16 and to be horizontal. It can slide in the direction. The upper guide rail 17 is divided into two and separated into a front guide rail 19 arranged in the closing direction of the safety door 16 and a rear guide rail 20 arranged in the opening direction. The front guide rail 19 and the rear guide rail 20 are in a straight line. Is arranged. One end of the front guide rail 19 in the closing direction of the safety door 16 is fixed to the fixed platen cover 15. Both end portions of the rear guide rail 20 are fixed to the vertical machine casing 4 (see FIG. 5) and the intermediate supporting machine casing 6. As shown in FIG. 3, the distance between the opposite ends of the front guide rail 19 and the rear guide rail 20 should be as long as possible so as not to disturb the operator. The working efficiency can be improved even if the distance that the hanging tool for suspending the machine parts passes is wide.

As a supporting roller at the upper part of the safety door 16, a first roller 23 is provided at the end in the closing direction, a second roller 24 is provided at the end in the opening direction, and a third between the second roller 24 and the vicinity of the center of the safety door 16. A roller 25 is arranged, and these rollers 23, 24, 25 are guided by the upper guide rail 17 (the front guide rail 19 or the rear guide rail 20).
When the safety door 16 is in the closed state, the first roller 23 is supported by the front guide rail 19 and the second roller 24 is supported by the rear guide rail 20 to suppress the shaking of the closed safety door 16.

  Further, the second roller 24 is always accommodated in the rear guide rail 20, and in the process of opening the safety door 16, the third roller 25 is moved rearward until the first roller 23 is separated from the front guide rail 19. It is arranged so as to be inserted into the guide rail 20, so that even when the safety door 16 is in the middle of opening, it is guided to the rear guide rail 20 at two locations of the rollers 24 and 25, so that the safety door 16 is prevented from shaking. it can. In the fully opened state of the safety door 16, it is preferable that all the first to third rollers 23, 24, and 25 are housed and guided in the rear guide rail 20.

  Further, a third guide rail 26 is added to the upper part of the lower guide rail 18 to prevent the safety door 16 from shaking and falling during opening. The third guide rail 26 is provided from the end surface of the lower guide rail 18 (on the fixed platen cover 15 side) to the vicinity of the intermediate support machine frame 6, and the intermediate support machine frame 6 and the fixed cover 14 on the side surface around it. To avoid interference. An additional roller 27 guided by the third guide rail 26 is attached to the back side of the safety door 16. Note that the arrangement location of the third guide rail 26 is not limited to the upper portion of the lower guide rail 18, and may be arranged on the lower portion or side portion of the lower guide rail 18.

  Further, since the support rollers (23, 24, 25) of the safety door 16 come in and out at the end surfaces facing the front guide rail 19 and the rear guide rail 20, the end surfaces are formed in a funnel shape so that the rollers 23, 24, 25 can be drawn smoothly. Spread it out. Further, in the closing process of the safety door 16, there may be a case where the first roller 23 at the top of the safety door 16 collides with the funnel-shaped portion 19a (see FIG. 5) on the end surface of the front guide rail 19 and is pulled in. If one roller 23 is provided with an impact absorbing mechanism (not shown), the operation becomes smoother.

  As for the combination of the guide member and the guided member, the roller and the guide rail, the slider and the guide rail are inexpensive and the best as in the above-described embodiment, but there are other linear motion mechanisms such as a slider and a shaft and a linear guide. Applicable. The safety door device according to the present invention is not limited to the safety door on the front side of the machine of the mold clamping unit and the injection unit, but can be applied to safety doors and covers that slide in the horizontal direction, such as a safety door device on the back side of the machine.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Machine stand 3 Machine frame of the left-right direction 4 Machine frame of the vertical direction 5 Machine frame of the front-back direction 6 Machine frame of intermediate support 7 Mold clamping part 8 Injection part 9 Mold 10 Cylinder assembly 11 Movable platen 12 Fixed platen 13 Fixed cover at the end 14 Fixed cover at the side 15 Fixed platen cover 16 Safety door 16a Safety door rear surface 16b Safety door window 17 Upper guide rail 18 Lower guide rail 19 Front guide rail 19a Funnel-shaped part 20 Rear guide rail 21 Upper guide rail 21 Roller 22 Lower roller 22a Lower roller (horizontal support)
22b Lower roller (vertical support)
23 First roller 24 Second roller 25 Third roller 26 Third guide rail 27 Additional roller 28 Conventional upper guide rail 29 Worker's work space 30 Distance between ends

Claims (4)

In the injection molding machine, guided members are attached to the upper and lower parts of the safety door, and the safety door is slidably supported horizontally by the upper and lower guide members parallel to the horizontal direction.
The upper guide member is divided into two parts, which are separated into a front guide member arranged in the closing direction of the safety door and a rear guide member arranged in the opening direction, and the front guide member and the rear guide member are arranged in a straight line. And
The safety door is provided with a first guided member at an end portion in the closing direction of the safety door and a second guided member at an end portion in the opening direction of the safety door as upper guided members. The guide member is guided by the upper guide member, and the second guided member is always guided by the rear guide member,
A safety door device for an injection molding machine, wherein the first guided member is supported by the front guide member and the second guided member is supported by the rear guide member in the closed state of the safety door. In the injection molding machine, guided members are attached to the upper and lower parts of the safety door, and the safety door is slidably supported horizontally by the upper and lower guide members parallel to the horizontal direction.
The upper guide member is divided into two parts, which are separated into a front guide member arranged in the closing direction of the safety door and a rear guide member arranged in the opening direction, and the front guide member and the rear guide member are arranged in a straight line. And
The safety door has an upper guided member, a first guided member at the end in the closing direction of the safety door, a second guided member at the end in the opening direction of the safety door, and the center of the safety door. A third guided member is provided between the first guided member and the second guided member, and these guided members are guided by the upper guide member, and are always guided by the rear guide member in the second guided member. And
A safety door device for an injection molding machine, wherein the first guided member is supported by the front guide member and the second guided member is supported by the rear guide member in the closed state of the safety door.   In the process of opening the safety door, the third guided member is arranged to be inserted and guided into the rear guiding member until the first guided member is detached from the front guiding member. The safety door device for an injection molding machine according to claim 2.   In addition to the guided member attached to the lower part of the safety door and the lower guiding member that supports the guided member, a third guiding member and a guided member are added to the upper, lower, or side of the lower guiding member. The safety door device for an injection molding machine according to any one of claims 1 to 3.

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