JPH0445859Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a scattering prevention device for ejecting and releasing a molded product in a resin molding machine, especially an injection molding machine. To ensure that molded products molded in large quantities by a mold can be reliably stored in a predetermined container without being damaged or contaminated after injection molding is completed and the mold is released.

[Conventional technology]

As shown in FIGS. 14 and 15, a commonly used conventional injection molding apparatus includes a resin molding machine 1 including a frame 2, an injection mechanism 3, a mold clamping mechanism 4, a hydraulic drive section 5, and an electric control. It consists of several departments.

In the mold clamping mechanism, four tie bars 8 are inserted into the four corners of the fixed die plate 6 and the movable die plate 7, and the mold 9 is inserted between the fixed die plate 6 and the movable die plate 7 inside each tie bar. is installed, and after completion of molding with this mold,
The mold is opened and the molded product is ejected, falls into the discharge section 16 through the discharge inlet 16', and is stored in a predetermined container. In this case, resin molded products such as electronic device parts that require precision and cleanliness are generally produced in large numbers by a runner arrangement that connects a plurality of cavities from a main sprue via gates.

[Problem that the invention attempts to solve]

However, in the conventional injection molding machine, both sides of the operation side and the opposite side are open at the part where the mold attached to the fixed die plate and the movable die plate are opened, so the ejector is not enough to process the molding. When the product protrudes from the mold and is released, the runner and the molded product are torn apart from their connection gates, not only for a single molded product, but especially for a multi-cavity molded product, and each If the lubricating oil for the movable die plate collides directly with the lower tie bar, or if it falls onto the frame base plate surface and comes into contact with the oil coated on the base plate surface, or if it does not fall into the molded product discharge area, it will leak outward from the surrounding area. It was often scattered.

As a result, precision parts and other various molded products used in computers and other electronic equipment, which are particularly sensitive to even the slightest dirt or oil, can be damaged if even one dirt or scratched product is mixed in. If assembled as is, there was a problem in that poor contact could occur, leading to major manufacturing accidents.

Furthermore, even if the number of molded products to be accommodated is set in advance using a counting counter, if there are molded products scattered outside the container, it will not be possible to accurately measure the number of molded products.

On the other hand, there is a desire to provide a cover around the mold part of an injection molding machine to prevent released molded products from scattering, and attempts have been made to install fixed covers around the mold part in the past. However, since the mold part is frequently opened for inspection and maintenance, a fixed cover is troublesome to install and remove, which hinders work, and it is not effective in terms of efficiency and safety of the molding process. A huge problem had arisen.

[Means for solving problems]

Therefore, in order to solve the conventional problems and achieve the purpose of the invention, the present invention is a scatter prevention device for ejecting and releasing a molded product in a resin molding machine. Resin film cover bodies are placed on both sides of the mold and the movable mold, and a magnet mounting tool, in which at least one end of each cover body is connected in a horizontally adjustable manner, is attached to the opposing mold or die plate. In the mold opening state, the cover body is stretched, and in the mold closing state, the cover body is folded outward.

In addition, in the mold clamping state by the above-mentioned mold,
A cover body is arranged inside tie bars facing each other with a mold in between, and the cover body is bent outward from between the upper and lower tie bars to form a curved shape or to protrude in a bellows shape. It shall be kept folded.

In addition, in the magnet attachment part on the movable mold side,
It shall be possible to adjust the length of the horizontal film resin according to the opening/closing stroke of the mold.

[Effect]

The action or operation process based on the above means will be explained. First, when clamping the mold, both horizontally long ends of the resin film cover body face each other in the part that covers the parting line between the fixed mold and the movable mold. Attached to the mold or die plate via a magnetic attachment device,
The entire length of the resin film between the magnet mounting devices of the opposing molds is folded in a curved manner while being bent outward, or folded in a bellows-like manner.

From this state, when the movable die plate opens the mold with a set stroke as the resin molding process is completed, the cover body follows the movable mold and shields the extended mold-opened space. The molded product ejected from the movable mold by the ejector is guided to the discharge port by the cover body and stored in the container even if it comes into contact with the tie bars or tries to scatter outside the intended location. .

Then, when the movable mold moves forward toward the fixed mold side in order to perform mold clamping again, the cover body follows and folds while bending outward and returns to its original position, thus completing one process.

〔Example〕

An embodiment of the present invention will be described below. In FIG. 14, reference numeral 1 denotes a commonly used and well-known resin molding machine, which includes a frame 2, an injection mechanism section 3, a mold clamping mechanism 4, and a mold for opening and closing the mold. It is composed of a hydraulic drive section 5, an electric control section, and the like.

The frame 2 is a part that can be called a base on which the injection mechanism part 3, mold clamping mechanism 4, hydraulic drive part 5, etc. are attached, and the flat part ₂₁ is provided with an inlet 16' for discharging the molded product. There is.

In addition, the injection mechanism section 3 measures the injection molding material,
It performs melting and injection.

The mold clamping mechanism 4 is provided with a mold 9 which is attached to both fixed and movable die plates and which is designed for multiple molds and closes it with a pressure higher than the injection pressure to prevent it from opening during injection. There is an ejector 10 with a mechanism that opens the mold and ejects the molded product when the injection molding is finished and the molded resin is solidified.
There is a fixed die plate 6 and a movable die plate 7 for opening and closing the mold, and a diver 8 for supporting the fixed die plate and the movable die plate for moving the mold 9.

The hydraulic drive unit 5 for mold clamping and mold opening controls the injection mechanism, a pump that supplies power to the mechanically operated hydraulic cylinder of the mold clamping mechanism, a pressure control valve, a direction switching valve, and a flow rate control valve. It consists of parts, oil tank, hydraulic piping, etc.

1 to 13 are related to the present invention, and show the front and back surfaces of the resin molding machine 1, which sandwich the fixed mold ₉₁ and the movable mold ₉₂ between the fixed die plate 6 and the movable die plate 7. on both sides, and tie bar 8,
A cover body 11 made of resin film is arranged on the opposite inner side of 8 ₁ to 8 ₄ or in a position outside the tie bar in some cases, and one end of the movable side of each cover body is connected so as to be adjustable in the horizontal direction. The magnet attachment tool 12 is attached to the opposing molds 9, _{9 1} , 9 ₂ or the die plates 6 and 7, and the cover body 11 is stretched when the mold is opened, and the cover body is stretched when the mold is closed. It has a structure that allows it to be folded outward.

When the cover body 11 is placed inside the tie bar 8, the cover body 11 is configured to bend and protrude outward from G between the left and right upper and lower tie bars 8, ₈₁ to ₈₄ . It has been done.

Further, when the cover body 11 is disposed outside the tie bar, another cover component is provided on the tie bar to cover the tie bar between the molds 6 and 7.

Further, it is preferable to provide a bendable thin plate 18 at the center of the upper and lower sides of the cover body 11 so as to exert an outward bending action.

As shown in FIG. 13, the cover body 11' in the clamped state can be folded into a bellows shape by alternately forming mountain folds and valley folds.

Furthermore, the length of the horizontally elongated cover body 11 can be adjusted at the magnet mounting tool portion on the side of the movable mold ₉₂ . As for the adjustment means, the one shown in the fourth figure has a plurality of small holes 15 formed in the vertical and horizontal row directions at the end of the movable mold 9 ₂ of the cover body 11, and a projection 13 that fits into the small holes in the vertical rows. Latching member 14,1
4 ₁ is connected to the magnet attachment tool 12 . In addition, in FIGS. 5 to 7, the base ends of the two rod-like bodies are connected to the hinge 14.
_{The edge 14 3 ′} of the hooking member 14 ′ is connected to the connecting head 14 ₄ ′ and the connecting body so as _to be openable and closable. It is shown connected to the magnet mounting tool 12 via 14 ₅ '. Note that the magnet mounting tool includes a connecting body 1.
₄₅ ' and its base protrusion ₁₄₆ ', and a coil spring ₁₄₇ ' is housed in the case body, so that when the cover body is tensioned to follow the mold opening of the mold, It has the effect of softening the tensile impact caused by the hydraulic pressure.

Then, a notch 140 is provided at the part of the hooking member ₁₄ , 141 shown in _FIG.
By forming interlocking claws ₁₂₅ in the mold, the mounting position of the magnet mounting tool 12 can be adjusted in the height direction according to the size or shape of the mold.

The magnet mounting tool includes a flat magnet piece 12 ₁ ;
A magnetic plate 12 ₂ that holds both sides of the magnet piece, a non-magnetic shaft 12 ₃ that connects the magnet piece 12 ₁ and the magnetic plate 12 ₂ , and a shaft 1 that is placed on both outer surfaces of the magnetic plate 12 ₂ .
It is composed of a non-magnetic hooking member 12 ₄ connected to the hook 2 ₃ and a holding portion 12 ₆ formed integrally with the hooking member.

Further, FIG. 8 shows an example in which the notch ₁₅ of the hooking member in _FIG . It is wrapped around the rod 20 and fixed, and its rod-shaped base end 11 ₂ is held by the two halves of the holding members 19 ₁ and 19 ₂ of the connecting bracket 19, and then the bolt 19 is held.
₃ and 19 ₄ , and the base portion is connected to the magnet mounting tool 12 by a shaft 19 ₅ .

The magnet mounting tool 12' shown in FIG. 9 has almost the same structure as the magnet mounting tool ₁₂ shown in _FIG . A stop shaft 12 ₇ ' is provided.

Note that the magnet mounting tool 12' is applied to mounting the cover body 11'' suspended below the die plates 6, ₇ or the molds 91, ₉₂ .

The material of the cover body 11 is generally a thin, flexible, and durable transparent nylon film resin with a thickness of about 0.2 mm called "66 nylon" or polyethylene terephthalate resin, and the lower end in the height direction is The length is set so that it extends downward and hangs down from the inlet 16' for discharging molded products in a resin molding machine.

〔Example of use〕

An example of use or a working process of the present invention based on the above embodiment will be explained.

FIGS. 1 and 10 show molds 9 and 9 attached to a fixed die plate 6 and a movable die plate 7.
₁ and 9 ₂ are closed and the mold is in a clamped state. At this time, the resin film cover body 11 is relaxed and bent outward, as shown in FIG. 10, and folded in a bent state.

Then, the heating cylinder 31 of the injection mechanism section 3 in the injection molding machine ₁ shown in FIG. The injection molding is completed by the molding process of the injection molding machine.

Since the movable die plate 7 opens the mold upon completion of injection molding, the mold thickness distance L shown in FIGS. 1 and 10 is
When the mold is moved from the mold opening stroke S (L+S') shown in FIGS. 2 and 12, it is bent outward and folded, or folded into a bellows shape as shown in FIG. 13. The end portion 11 ₁ of the cover body 11 on the movable mold 9 ₂ side moves to follow the retreat of the movable mold, and is located in the open space g between the fixed mold 9 ₁ and the movable mold 9 ₂ . Both sides a of the molds 9 ₁ and 9 ₂ ,
a' (shown in Figure 15). In this state,
Upon completion of the injection molding process, the movable die plate 7
When the molded product formed by the ejector 10 is released from the mold 9 and dropped into the discharge inlet 16' in conjunction with the opening of the mold, the molded product is separated from the mold by the pressure of the ejector. Even if a single molded product or a multi-piece molded product tends to be torn apart from the runner gate and scattered at random, the cover body 11 prevents the scattering and the product is delivered to a predetermined discharge section 16. reach.

Then, in order to clamp the mold again, the movable mold 9 ₂
When the cover body 11 is advanced toward the fixed mold ₉₁ by a set stroke S, the cover body 11 is bent outward and folded or folded into a bellows shape, thereby forming the original shape shown in FIG. 1 or FIG. Return to position.

[Effect of idea]

Since the present invention has the above-mentioned configuration, when molding small precision parts using an injection molding machine, both sides of the mold are covered with synthetic resin film covers, so when the mold is open, there is no space between the molds. Ensure both sides are shielded. Therefore, even if a single molded product is ejected from the mold by the pressure of the ejector or a molded product torn from the runner gate is scattered randomly, the molded product will Since it contacts the cover body, rebounds inward and falls into the discharge inlet, it is securely stored in the designated container through the discharge section without falling onto the floor, etc., and the yield of processed molded products is improved. Production efficiency improves. However, if the lower end of the cover body is set to a length extending downward from the inlet for discharging molded products and hangs down, prevention of scattering of the molded products can be more reliably ensured.

In addition, the cover body that shields both sides of the space of the opened mold is placed inside the tie bar, so even if the molded product that is ejected and released is scattered and comes into contact with the tie bar at the lower stage, the cover body is placed inside the tie bar. Since there is no direct contact with the tie bar, there is no possibility that the tie bar oil will adhere to the molded product.

Furthermore, the cover body can be made of any synthetic resin that is flexible, heat resistant, and oil resistant, or it can be made of a transparent film resin called ``66 nylon'' to cover the entire mold. Since the inside can be clearly seen from the outside, there is no problem with work, and inspection and safety can be ensured. Furthermore, since the cover body is thin, flexible, and highly heat resistant, it does not bend outward even when it follows the movement of the movable die plate back and forth.
Or, since it is compactly folded into a bellows shape and is not bulky, it does not get in the way, and since it is heat resistant, there is no risk of it melting or deforming even if it is placed near a mold that rises to high temperatures.

Furthermore, the cover body can be used interchangeably with molds of different sizes or shapes, as well as with resin molding machines of different models, since the adsorption position can be adjusted using a magnet attachment, making it easy to assemble. It has good workability. Furthermore, by setting the height of the cover body to fit between the upper and lower tie bars, even if the cover body protrudes outward during mold clamping, it can be folded up without being obstructed by the tie bars. In addition, when opening the mold, the molded product released by the ejector can be prevented from coming into direct contact with other parts than the designated areas, so the molded product can be reliably prevented from being damaged or contaminated. This makes it extremely practical as a scattering prevention device when ejecting and releasing a molded product in this type of resin molding machine.

[Brief explanation of the drawing]

Fig. 1 is a front view of the injection molding machine in which the scattering prevention device for protruding products in a resin molding machine according to the present invention is applied to the mold clamped state, Fig. 2 is a front view of the mold shown in Fig. 1 in the open state, and Fig. 3 is a perspective view of the mold and die plate portion, FIG. 4 is an enlarged perspective view of a portion of the attachment portion of the resin film cover body to the mold side, and FIG. 5 is a perspective view of other latching members at the latching portion. A perspective view, FIG. 6 is a plan view of the cover body hooking part on the movable mold side,
FIG. 7 is a plan view of FIG. 5, FIG. 8 is a perspective view showing another example of the cover body end hook, FIG. 9 is a perspective view showing another example of the magnet attachment device, and FIGS. Fig. 12 schematically shows the opening and closing states of the mold, Fig. 10 shows the mold clamped state when the cover body is bent outward and folded, Fig. 11 shows the mold in the middle of opening, and Fig. 12 shows the mold in the closed state. Figure 13 shows the first mold opening state with the cover body folded into a bellows shape.
Figure 14 is a front view of the injection molding machine, and Figure 15 is 15-1 in Figure 14.
5 is a schematic cross-sectional view taken along line 5. FIG. DESCRIPTION OF SYMBOLS 1... Injection molding machine, 2... Frame, 3... Injection mechanism, 4... Mold clamping mechanism, 5... Hydraulic drive unit for mold opening/closing, 6... Fixed die plate, 7... Movable die plate, 8 , 8 ₁ ~ _{8 4} ... tie bar, 9, 9 ₁ ,
9 ₂ ... Mold, 10... Ejector, 11... Transparent film resin cover body, 12... Magnet mounting tool.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Cover bodies made of resin film are arranged on both sides of the fixed die plate and the movable die plate between the fixed die plate and the movable die plate, and at least one end of each cover body is disposed between the fixed die plate and the movable die plate. The magnet mounting device, which is adjustable in the horizontal direction, is attached to the opposing mold or die plate, and when the mold is in the open state, the cover body is stretched.
A scatter prevention device for ejecting and releasing a molded product in a resin molding machine, characterized in that a cover body is folded outward when the mold is in a clamped state. (2) In the mold clamping state, the cover body placed inside the tie bars facing each other with the mold in between is bent outward from between the upper and lower tie bars to form a curved or bellows shape. A scatter prevention device for ejecting and releasing a molded product in a resin molding machine according to claim 1, which is folded tightly. (3) Scatter when a molded product is ejected and released from a resin molding machine according to claim 1, which is a utility model registration in which the length of a horizontally long film resin can be adjusted at a magnet attachment part on the side of a movable mold. Prevention device.