JPH0445858Y2 - - 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 processing is completed and the mold is released.

[Conventional technology]

Conventionally known injection molding machines that are commonly used are:
As shown in FIGS. 11 and 12, frame 2,
It is composed of an injection mechanism 3, a mold clamping mechanism 4, a hydraulic drive section 5, an electric control section, etc. In the mold clamping mechanism, four tie bars 8 (8 ₁ to 8 ₄ ) are installed at the four corners of the fixed die plate 6 and the movable die plate 7.
The mold 9 is inserted into the fixed die plate 6 and the movable die plate 7 located inside each tie bar.
(9 ₁ , 9 ₂ ) are attached, and after completion of molding with this mold, the mold is opened and the molded product is dropped into the molded product discharge section 16 and stored in a predetermined container. In this case, small 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.

[Problems to be solved by the invention] 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. Because of this, the molded product is ejected vigorously by the ejector and released from the mold, so not only for a single molded product, but especially for multi-cavity molded products, the runner and molded product are separated from the connection gate. They tear and separate, and each of them comes into contact with the lower tie bar and comes into contact with the lubricating oil for the movable die plate, or falls onto the frame base plate surface and comes into contact with the oil coated on the base plate surface, or comes into contact with the molded product discharge part. In many cases, the particles did not fall and were scattered outside the area.

As a result, especially when injection molding precision parts used in computers and other electronic devices that are sensitive to even the slightest amount of dirt or oil, assembly work may be interrupted if even one product with dirt or scratches is mixed in. However, there was a problem in that it could lead to serious accidents.

Further, even if the number of stored molded products is set in advance using a counting counter, if there are molded products scattered outside the container, it is impossible to accurately measure the number.

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. Elastic bars are arranged horizontally on both the left and right sides of the mold and at the upper and lower positions inside at least the lower tie bars of the upper and lower tie bars, and both ends of the elastic bars are connected to a magnet attachment tool, and the magnet is attached. The tool is removably connected to the opposing mold or die plate, the film resin cover body is suspended from the upper elastic bar, and the lower elastic bar is placed at a predetermined position in the height direction of the cover body. This supports the elastic bar to follow the expansion and contraction of the elastic bar as the movable die plate moves.

[Effect]

The action or operation process based on the above means will be explained. First, during mold clamping, a film resin cover is suspended from the upper elastic bar at the part that covers the area around the parting line of the mold. The entire length of the body in the lateral direction is folded in a bellows-like manner inside each elastic bar, thereby being shortened.

From this state, when the movable die plate opens the mold with a set stroke as the resin molding process is completed, the elastic bar stretches against its elasticity, and at the same time, the cover body follows the elastic bar. By moving and shielding the lower part of the mold from the opening part of the mold, molded products that are forcefully ejected into the ejector and separated from the mold may come into direct contact with the tie bars or be scattered in areas other than the intended location. The cover body guides the waste to the inlet side of the discharge section and accommodates it in the container without scattering elsewhere. At this time, the end of the cover body located on the movable die plate side is stretched with an appropriate tension to the movable die plate and fixed die plate side by following the elastic bar by a mooring member consisting of an appropriate string. There is.

Then, when the movable die plate retreats to perform mold clamping again, the cover body also retreats together with it, and returns to its original position while being folded and shortened, completing one process.

Note that the opening and closing strokes of the die plate will differ depending on the size of the die attached to the die plate. In that case, change the adsorption position of the magnet attachment to the die or fixed die plate side. shall be adjusted.

〔Example〕

Embodiments of the present invention will be described below. In FIGS. 11 and 12, reference numeral 1 denotes a commonly used and well-known injection molding machine, which includes a frame 2, an injection mechanism 3, a mold clamping mechanism 4, and a hydraulic drive section. 5 and an electric control section.

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

Further, the injection mechanism 3 measures, melts, and injects the injection molding material.

The mold clamping mechanism 4 is equipped with a pressure higher than the injection pressure to prevent the molds 9 (9 ₁ , 9 ₂ ) designed for multiple molds attached to both fixed and movable die plates from opening during injection. The ejector 1 is a mechanism that closes the mold and opens the mold to eject the molded product when the injection is finished and the molding resin is solidified.
5, a fixed die plate 6 and a movable die plate 7 for opening and closing the mold, and a mold 9 (9
Divers 8 (8 _{1 to 8
4} ).

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

The electric control section includes a heating control section that adjusts the temperature of the cylinder and nozzle, and a limit switch, timer, relay, etc. that controls the operation of the mold clamping mechanism.

The present invention provides tie bars 8 1 , 8 ₂ on both the left and right sides of the mold 9 (9 ₁ , 9 ₂ ) between the fixed die plate 6 and the movable die plate 7 and on the upper and lower stages in the injection molding machine ₁ described above. Elastic bars ₁₁ (11 _{1 and} 11
₂ , 11 ₃ , 11 ₄ ) are placed horizontally,
Both sides of the elastic bars _{11 1 ,} 11 2 are removably connected to the opposing inner surfaces of each die plate 6 , 7 , and the upper elastic bars 11 1 , 11 ₂ are made of a transparent material at least in the visible area of the mold part and its surroundings. The nylon film resin cover body 10 is connected to the hooking part 142 of the ring-shaped sliding member 14 or directly connected to be suspended, and the elastic bar 11 ₃ at the lower part,
11 ₄ supports a predetermined position in the height direction of the cover body 10 whose lower end is suspended downward from the lower tie bars 8 ₃ and 8 ₄ , and further follows the expansion and contraction of each elastic bar 11 as the movable die plate 7 moves. It was designed to do so. Further, as shown in FIG. 10, the elastic bar may be manufactured using rod-shaped synthetic rubber having a high elasticity. In this case, it is preferable that the plurality of hanging parts 11 ₁ for suspending the cover body be integrally formed with an elastic bar made of rod-shaped synthetic rubber.

Note that among the ring-shaped sliding members for suspending the cover body that fit into the rod-shaped coil spring 11, the sliding member 14 ₁ is located at the end on the fixed die plate 6 side.
It is preferable to make the elastic bar 11 into a socket shape as shown in FIG. 7, and to form a slot 14 ₁ ' through which only the hooking part at the end can pass, thereby maintaining the function of preventing the elastic bar 11 from coming off.

FIG. 8 shows another embodiment in which the cover body 10 is suspended. A plurality of holes 140 are formed at appropriate intervals along the upper side of the cover body, and when the rod-shaped coil springs 11 are inserted into the holes 140, the first to The sliding member 14 shown in FIGS. 5 and 7 can be omitted.

The material of the cover body 10 is an extremely thin, flexible, and durable transparent nylon film resin generally called "66 nylon", and is made of mountain-folded resin at appropriate intervals along the height direction. 18
₁ and valley fold 18 ₂ (Fig. 8, Fig. 9), or leave no fold (Fig. 1).
Figure 0).

Further, the lower end of the cover body in the height direction is set to such a length that it extends downward and hangs down from the inlet 16' for discharging molded products in the resin molding machine.

Furthermore, a sheet-like or plate-like cover body 10' made of the same material as the cover body 10 or a different material is attached to the lower part of the opposing die plates 6, ₇ or the molds 9 (9 ₁ , 9 2 ), and a magnet mounting tool 13 is attached thereto. It shall be adsorbed so that it can be removed through the

Reference numeral 12 denotes a mooring member that connects the movable side end ₁₀₁ of the cover body 10 to the movable die plate 7 side with a tensile action using a thin string, a thin coil spring, a rubber string, or other appropriate string. be. In addition,
When a plurality of holes 140 are bored at appropriate intervals along the upper side of the cover body 10 as shown in FIGS. 8 and 9, and the rod-shaped coil springs 11 are inserted through these holes, in addition to the movable side ₁₀₁ of the cover body, The end side 10 ₂ is also connected to the solid die plate 6 side by a mooring member 12.

The magnet mounting tool 13 used as a means for connecting both ends of the elastic bar 11 to the die plates 6 and 7 includes a magnet body 13 ₁ as shown in FIGS.
Magnetic body 13 ₂ held by sandwiching both sides of the magnet body
, a non-magnetic shaft 13 ₃ that connects the magnetic plate and the magnet 13 ₁ , and an end 110 of an elastic bar that is connected to the shaft 13 ₂ by applying it to both outer surfaces of the magnetic plate 13 ₂ .
It consists of a non-magnetic hanging member 13 ₄ for hanging the
Furthermore, a connecting member 17 is provided for connecting the shaft 13 ₄ ' of the hooking portion to the end of the elastic bar. Note that the magnet mounting tool 13 is attached to the die plate 6,
The present invention can also be applied to attaching a cover body 10' provided at the lower part of the die 7 or the mold 9 (9 ₁ , 9 ₂ ).

〔Example of use〕

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

In FIG. 1, the molds 9 (9 ₁ , 9 ₂ ) attached to the fixed die plate 6 and the movable die plate 7 are closed and in a clamped state. At this time, the elastic bar 11 is also in a relaxed state, but still has some tensile action, and the cover body 10 is also in a state of tension with an appropriate tension via the anchoring member 12.

Then, the heating cylinder 31 of the injection mechanism 3 is advanced, and the nozzle 32 is inserted into the fixed die plate 6.
The sprue of one of the molds ₉₁ is touched through the hole 60, and the injection is then completed by the known molding process of an injection molding machine.

Next, when the movable die plate 7 opens the mold upon completion of injection and moves from the distance L in the mold clamping state shown in Figure 1 to the mold opening stroke S (L+S') set in Figure 2, it folds into a bellows shape. The movable end 101 of the cover body 10, which is shortened due to the movement, moves to follow the movable die plate ₇ and each elastic bar 11 due to the tensile force of the anchoring member 12, and the metal on the fixed die plate side moves. Mold 9 ₁ and mold 9 ₂ on the movable die plate side
The operation side and the side surfaces a and a' on the opposite side in the open space g are shielded. In this state,
Upon completion of the injection molding process, the movable die plate 7
When the molded product processed by the ejector 15 linked to the opening of the mold separates from the mold and falls into the ejection inlet 16', not only a single molded product but also
Although a multi-piece molded product tends to be torn apart from the gate of the runner and scattered at random, the cover body 10 prevents the scattering and reaches the predetermined discharge section 16.

Then, in order to perform mold clamping again, the movable die plate 7 is set to the fixed die plate 6 side with a stroke S.
When the mooring member 1 is moved by 1, the mold is clamped as shown in FIG.
The cover body 10 following through 2 also returns to its original position in FIG.

[Effect of idea]

Since the present invention has the above-mentioned configuration, when molding small precision parts using an injection molding machine, the rod-shaped coil spring or synthetic rubber expands and contracts in response to the opening and closing operations of the forming mold, and is suspended by the mold. The cover body follows the elastic bar and reliably covers the space between the molds when the mold is opened. Therefore, a single molded product that has been processed is violently ejected from the mold by the ejector, or a multi-piece molded product that has been torn from the runner gate is scattered randomly. Also, the molded product comes into contact with the cover body and bounces inward, and falls into the discharge inlet, so that the molded product is securely stored in the designated container through the discharge section without falling onto the floor, etc.
The yield of processed molded products is improved, and production efficiency is improved. 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 the space of the opened mold is placed inside the tie bar, so even if the molded product is thrown away with force and is released and scatters and comes into contact with the tie bar at the lower stage, Since this is indirect contact and never direct contact, there is no risk of tie bar oil adhering to the molded product.

Furthermore, the cover body is made of a film resin called ``66 nylon'' that has high tensile strength and excellent chemical resistance, and is made of a film resin called ``66 nylon'' that has high tensile strength and excellent chemical resistance. By making the periphery transparent, even if the entire mold is covered with a cover body, the inside can be clearly seen from the outside, so there is no problem with work, and inspection and safety can be ensured.
Also, since the cover body is thin and flexible,
Even if it follows the expansion and contraction of the movable die plate and elastic bar, it can be folded compactly into a bellows-like shape, and since it is not bulky, it does not get in the way.It is also heat resistant, so it can be placed near molds that rise to high temperatures. There is no risk of melting or burning.

In addition, since a magnet is used to attach the elastic bar for suspending the cover body, which makes it easy to attach and detach using magnetic attraction, it can be easily attached and detached in a narrow space near the mold. I can do it.

In addition, by using the above-mentioned magnet attachment device with the thick plate surface of the magnet body as the attracting surface, and attaching a magnetic plate to the wide flat surface and bottom surface and sandwiching and axially connecting the device, a strong adsorption can be achieved to the thick plate surface. force is generated. The attracting surface of the thick part of the magnet body generates a strong attracting force in the horizontal direction opposite to that surface and cannot be easily separated, but the force of pushing it in the horizontal direction of the plane/bottom surface is strong. If you add , it can be pulled apart relatively easily. Therefore, due to the strong mounting force and easy attachment/detachment operation of this magnet attachment tool, adjustments such as position changes can be made freely.

By connecting the end of the cover body on the movable side to the movable die plate with an anchoring member, the cover body can expand and contract while reliably following the mold clamping and mold opening operations of the movable die plate.

Furthermore, since the cover body is suspended by elastic bars installed on the upper and lower stages, it can be used with molds that have different opening and closing strokes depending on the size of the mold, and can also be used for molding with different models. It can also be used interchangeably with other machines.

Furthermore, since the lower part of the cover body in the height direction is supported by the lower elastic bar, the scattered and falling molded products can come into direct contact with the flat surface of the frame below the lower tie bar and other places other than the specified ones. Therefore, the molded product can be reliably protected from damage and dirt, and is extremely practical as a scatter prevention device when ejecting and releasing the molded product in this type of resin molding machine.

[Brief explanation of drawings]

Fig. 1 is a front view of the resin molding machine according to the present invention in which the scattering prevention device for protruding products is applied to an injection molding machine in an open state, Fig. 2 is a front view of the mold shown in Fig. 1 in a closed state, and Fig. 3 1 is a sectional view taken along the line 3-3 in FIG. 6 is a sectional view taken along the line 6-6 in FIG. 4, FIG. 7 is a sectional view taken along the line 7-7 in FIG. 4, and FIG. A front view showing the embodiment, FIG. 9 is a plan view of FIG.
Figure 0 is a front view of still another embodiment of Figure 1;
1 is a front view of the injection molding machine, and FIG. 12 is an enlarged schematic sectional view taken along line 12-12 in FIG. 11. DESCRIPTION OF SYMBOLS 1... Injection molding machine, 2... Frame, 3... Injection mechanism, 4... Mold clamping mechanism, 5... Hydraulic drive unit, 6
... Fixed die plate, 7 ... Movable die plate, 8 (8 ₁ to 8 ₄ ) ... Tie bar, 9 (9 ₁ 9
₂ )...Mold, 10...Film resin cover body,
DESCRIPTION OF SYMBOLS 11 (11 ₁ - 11 ₄ )...Elastic bar, 12...Mooring member, 13...Magnet mounting tool, 14...Ring-shaped sliding member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Elastic bars are installed horizontally on both left and right sides of the molding die between the fixed die plate and the movable die plate, and at the upper and lower positions of the upper and lower tie bars, at least inside the lower tie bars. , both ends of the elastic bar are connected to a magnet mounting tool, and the magnet mounting tool is removably coupled to the opposing mold or die plate, and a film resin cover body is attached to the upper elastic bar. A resin characterized in that it is suspended and supported at a predetermined position in the height direction of the cover body at the lower elastic bar portion so as to follow the expansion and contraction of the elastic bar as the movable die plate moves. A device to prevent scattering during ejection and release of molded products in a molding machine. (2) Utility model registration claim No. 1, in which the film resin cover body is made of transparent nylon resin at least in the mold part, and the lower end is set to a length that hangs downward from the molded product discharge inlet of the resin molding machine. A device for preventing scattering during ejection and release of a molded product in the resin molding machine according to item 1. (3) A scattering prevention device for ejecting and releasing a molded product in a resin molding machine according to claim 1, wherein the elastic bar is molded from a rod-shaped coil spring or a rod-shaped synthetic rubber with a high elasticity.