JPH0422982Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is designed to prevent material scattering due to unexpected material leakage and spouting when plasticized and molten raw material is injected and filled into the mold cavity from the nozzle at the tip of the heating cylinder. This invention relates to an injection molding machine equipped with a prevention cover.

(Prior art) Conventional raw material scattering prevention covers generally have a square cross-sectional shape with an opening at the bottom, and are fixed at one end to a fixed plate by means such as bolting. For operations such as nozzle alignment when replacing molds, a shutter-like object forming a part of the raw material scattering prevention cover provided on the operating object side is opened vertically or horizontally to obtain a work space.

(Problems to be solved by the invention) However, in such a device, the working space available even if the shutter-like object is opened is extremely small, and the main body of the material scattering prevention cover is not secured by bolts or other means as described above. Since it is fixed to a fixed plate, it cannot be easily attached or detached, and it becomes a nuisance, resulting in poor workability.

(Means for Solving the Problems) The present invention was developed against the background of the above circumstances, and is intended to operate the injection molding machine in a direction perpendicular to the axial direction of the heating cylinder without fixing the raw material scattering prevention cover to the fixed plate. It is rotatably provided from the opposite side to the position where it abuts the stay nut of the stationary plate.

(Example) Examples of the present invention will be described below with reference to the drawings. The attached FIG. 1 is a front view of essential parts showing an embodiment of the present invention, FIG. 2 is a side view taken in the direction indicated by the - arrow in FIG. 1, and FIG. FIG. 4 is an enlarged sectional view taken along the - arrow in FIG. 1 is a bed of an injection molding machine, 2 is a fixed plate of a mold clamping device installed on the bed 1, and the fixed plate 2 is moved along a stay 4 by advancing or retracting the mold clamping ram 3 to an opposing position. A movable platen 5 is provided which can be moved close to or away from the. 6 is a composite stay nut screwed onto the stay 4. A fixed mold 7 is attached to the fixed platen 2, and a movable mold 8 is attached to the movable plate 5.

9 is a cavity formed when the fixed mold 2 and the movable mold 5 are closed. 10 is a sprue which is a passage for injecting molten raw material into the cavity 9.

20 is a heating cylinder, and 21 is a nozzle provided at the tip of the heating cylinder 20; although not shown, the heating cylinder 2
A screw that rotates and reciprocates in order to plasticize, melt, and inject the raw material is provided inside the screw.

2A is a heating cylinder 20A, and a fixed platen 2 in order to allow the nozzle 21 to approach the fixed mold 7 without any obstruction.
It is a truncated conical recess provided in the.

30 is a thin cylindrical raw material scattering prevention cover whose inner diameter is larger than the diameter of the base of the truncated conical recess of the stationary platen 2 and whose lower part is open, and which is formed of a strong material such as an iron plate and whose lower part is open. Frame 30A, Frame 3, which has a shape of a shape and has a wide center part cut out leaving the peripheral part to the extent that there is no problem in terms of strength.
A transparent member 30B made of acrylic resin or the like is fixed to the frame 30A so as to completely cover the wide part of the central part of 0A, and a center is fixed to one end of the frame 30A. A substantially triangular prism-shaped structural member is integrally fixed to a position on the opposite side of the frame 30A to the side on which the boss portion 30C is provided so as to form a boss portion 30C having a through hole, a vertical front portion and a horizontal bottom portion. It consists of a cam portion 30D and a handle 30E fixed to the frame 30A. Reference numeral 31 denotes a stepped bolt which has a threaded portion 31A at the tip, which has a diameter larger than the outer diameter of the threaded portion 31A following the threaded portion 31A, and which fits into the through hole of the boss portion 30C of the raw material scattering prevention cover 30 with almost no play. A pin part 31B having an outer diameter of 1, and a hexagonal socket wrench or the like to make the outer dimension larger than the outer diameter of the pin part 31B and screw the threaded part 31A to a female thread provided on the fixed platen 2 side. It consists of a head 31C with a hanging part. Furthermore, pin part 3
The length of 1B is the boss part 3 of the raw material scattering prevention cover 30.
It is slightly longer than the length of 0C (for example, about 0.5 mm so that there is virtually no gap between the fixed platen 2 and the raw material scattering prevention cover 30).

32 is a cam portion 30D of the raw material scattering prevention cover 30
This is a bracket for mounting and supporting the horizontal bottom part of the frame on its upper surface, and is fixed to the stationary platen 2.

Reference numeral 33 denotes a limit switch, which is connected to the bracket 32 so that when the horizontal bottom surface of the cam portion 30D of the raw material scattering prevention cover 30 is placed and supported on the upper surface of the bracket 32, it is engaged with the horizontal bottom portion of the cam portion 30D. is attached to.

34 is a cam portion 30D of the raw material scattering prevention cover 30
It is a locking device for fixing both when it is placed and supported on the upper surface of the bracket 32, and in this example, a catch is provided on each of the cam portion 30D on the raw material scattering prevention cover 30 side and the mating bracket 32. A so-called punch lock is used, which can be locked and unlocked by operating a hook ring using a provided handle.

Next, the operation will be explained.

In FIG. 1, the movable mold 8 mounted on the movable platen 5 is closed along the stay 4 by the operation of the mold clamping ram 3, and comes into contact with the fixed mold 7 mounted on the fixed platen 2, and the mold Tightening is completed. Thus, the fixed mold 7 and the movable mold 8 form a product cavity 9.

On the other hand, on the injection side, the tip surface of the nozzle 21 attached to the tip of the heating cylinder 20 is tightly pressed against the entrance of the sprue 10 of the fixed mold 7 by the action of a shift cylinder (not shown), resulting in a nozzle touch state. Become.

When the raw material scattering prevention cover 30 is closed,
That is, the horizontal bottom portion of the cam portion 30D is placed and supported on the upper surface of the mating bracket 32, and the stop device 34
When the two are fixedly locked, the limit switch 33 is engaged with the cam portion 30C, and the injection interlock is released.

The plasticized and molten raw material is transferred from the nozzle 21 to the sprue 10 of the stationary mold 7 by the forward movement of the screw.
is injected into the cavity 9 through.

In the unlikely event that there is a problem with the nozzle touch during the injection of the raw material (due to center runout or a difference in radius of the contact sphere from the beginning of the nozzle touch, the contact between the tip surface of the nozzle 21 and the inlet of the sprue 10 is not tight, or the nozzle touch force is insufficient, etc.) The raw material during injection leaked and the heating tube 2
0 and the truncated conical recess of the stationary plate 2, the raw material scattering prevention cover 30
This prevents the molten raw material from scattering to the surrounding area, ensuring good safety for the operator, and preventing damage and contamination of the surrounding environment. During normal molding, a transparent member 30B is fixedly provided so as to completely cover the wide central part of the frame 30A.
The heating tube 20 and the nozzle 21 can be visually observed through it.

Next, the operation when opening the raw material scattering prevention cover 30 will be explained.

In FIG. 4, the raw material scattering prevention cover 30 is installed by inserting a stepped bolt 31 into the boss portion 30C and rotating and tightening it by applying a wrench to a hexagonal hole or other wrench-applied portion provided in the head portion 31C of the stepped bolt 31. The screw member 31A at the tip is screwed into a female screw provided on the fixed platen 2.

The pin portion 31B of the stepped bolt 31 has a larger outer diameter than the screw member 31A, that is, it is a stepped pin, and the boss portion 3 of the raw material scattering prevention cover 30
It fits into the through hole 0C with almost no play, and its length is equal to the boss part 30C of the raw material scattering prevention cover 30.
The boss part 3 is slightly longer than the length of the boss part 3.
0C, that is, the raw material scattering prevention cover 30 is the pin part 3
While being pivotally supported by 1B, it is allowed to freely rotate with virtually no gap between it and fixed platen 2.

Therefore, the state indicated by the two-dot chain line in FIG. 2 and FIG. 3 will be explained.

When the operator unlocks the locking device 34 (in this example, removes the snap lock) and lifts the raw material scattering prevention cover 30 to the opposite side using the handle 30E, the raw material scattering prevention cover 30 moves to the boss portion 30C. The frame 30A rotates while being pivotally supported by the pin portion 31B of the stepped bolt 31, and comes to rest at a position where a part of the frame 30A abuts the stay nut 6. In such a state, the limit switch 33 closes the cam portion 3 of the raw material scattering prevention cover 30.
Since the engagement with 0D is released, the interlock is effective for injection, and no injection operation is performed.

(Operations and Effects) According to the present invention, during normal molding, it is possible to visually observe the heating cylinder and the nozzle provided at its tip through the transparent member of the raw material scattering prevention cover, and in the unlikely event that there is a problem with the nozzle touch during injection. Even if the molten raw material leaks or is sprayed, it is blocked by the raw material prevention cover, and the safety of the operator is maintained well, and damage and contamination of the surrounding environment are also avoided. In addition, when it is necessary to inspect or clean the nozzle tip surface or the sprue entrance of the stationary mold, or when aligning the nozzle when replacing the mold, the operator must rotate the raw material scattering prevention cover to the position where it contacts the stay nut on the stationary platen. Just by moving it, the front work space is secured without any obstructions.

[Brief explanation of drawings]

FIG. 1 is a front view of essential parts showing an embodiment of the present invention, and FIG. 2 is a side view taken in the direction of the - arrow in FIG. 3 is a sectional view taken along the - arrow in FIG. 2, and FIG. 4 is an enlarged sectional view taken along the - arrow in FIG. 2... fixed plate, 2A... truncated conical recess, 5...
...Movable plate, 6... Stay nut, 7... Fixed side mold, 8... Movable side mold, 9... Cavity, 20
... Heating cylinder, 21 ... Nozzle, 30 ... Raw material scattering prevention cover, 30C ... Boss section, 30E ... Handle, 31 ... Stepped bolt.

Claims (1)

[Scope of utility model registration request] A movable plate that approaches or moves away from the fixed plate is provided, a movable mold is fixed to the movable plate, a fixed mold is fixed to the fixed plate, and a heating cylinder and a heating cylinder are provided at the center of the fixed plate. A recessed portion is provided to enable the nozzle portion at the tip to approach and come into contact with the stationary side mold, and a predetermined raw material that has been plasticized and melted in the heating cylinder is injected through the nozzle portion at the tip, and the mold is placed on the stationary side. In an injection molding machine configured to inject and fill a product cavity formed by a mold and the movable mold, when the heating cylinder and the nozzle portion at the tip approach or come into contact with the fixed mold, a raw material scattering prevention cover that covers the front outer periphery of the heating cylinder and the recess provided in the center of the fixed plate and is rotatable in a direction perpendicular to the axial direction of the heating cylinder to a position where it abuts on the stay nut of the fixed plate; An injection molding machine that is characterized by being equipped with.