JPH0544095Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to the structure of an air valve provided in a mold for peeling off formed products.

(Prior Art) Conventionally, as a mold for molding a bag-like or cylindrical product with a relatively thin wall thickness, as shown in FIG.
2 is sandwiched between an upper mold 33 and a lower mold 34, and the material is poured into a cavity formed between the core 32 and the upper mold 33 and the lower mold 34 to form a product.
An air valve 3 is provided at the tip of the center core 32 of this mold.
5 is provided, and by blowing out air from the same air valve 35, the product that is in close contact with the core 32 after molding can be peeled off.

On the other hand, as shown in Fig. 9, a ring-shaped ridge 36 is formed around the central core 32 at a location on the upper die 33 and lower die 34 corresponding to the tip of the central core 32, narrowing the gap S between the ridge 36 and the central core 32. The tip side of the molded product is cut away at the boundary of this thin portion, and the base side becomes the finished product.

The structure of the air valve 35 described above will be explained with reference to FIG. A locking pin 39 is attached to the portion to prevent the valve 38 from rotating relative to the center core 32. The tip of the shaft of the valve 38 protrudes into the air passage 40 in the core 32, and a valve receiver 41 having a hexagonal hole 41a is screwed onto the tip. A spring 42 is installed between the valve receiver 41 and the bottom wall of the air passage 40, and the spring 42 biases the valve receiver 41 toward the proximal end of the center core 32, so that the valve 38 is Contact surface 37 of core 32
It is becoming more and more common to have pressure installed on the ground. As shown in FIG. 8, the air passage 40 of the core 32 is
The core 32 extends to the base end of the liner 31 and is closed by attaching the core 32 to the liner 31.
Further, as shown in FIG. 9, a jet hole 43 is penetrated between the air passage 40 and the contact surface 37, and when compressed air is supplied to the air passage 40 from an air supply port (not shown), the air is the center core 3 of the valve 38
2 is pushed toward the tip side, and is ejected from between the valve 38 and the contact surface 37 to peel off the molded product that has adhered around the core 32 from the core 32.

In the air valve 35, the spring 42 deteriorates early due to the heat of the mold.
Between the valve 38 and the contact surface 37 or the spout hole 43
Molding material may get inside the product and cause malfunction. Therefore, at this time, it is necessary to disassemble the air valve 35 and replace the spring 42, or to replace the valve 35.
We are currently cleaning 8 areas.

(Problem to be solved by the invention) However, in order to disassemble the air valve 35 having the above configuration, first, the core 32 is removed from the liner 31, the air passage 40 is opened at the base end of the core 32, and then the air passage 40 is opened at the base end of the core 32. , insert a hexagonal wrench into the air passage 40 through this opening, and use the same wrench to open the valve receiver 41.
from valve 38. Then, the valve receiver 41 and the spring 42 must be taken out from the opening, and the valve 38 must be removed from the contact surface 37 toward the tip of the center core 32. That is, in order to disassemble the air valve 35 having the above structure, the core 32 must be removed from the liner 31.

By the way, as mentioned above, the base end of the core 32 is fixed to the liner 31, and the upper mold 33 and the lower mold 34 are connected to each other.
The positioning is done for. Therefore, when reattaching the core 32, which has been removed for disassembly of the air valve 35, to the liner 31,
It is necessary to accurately adjust the gap S shown in FIG. 9 described above so that it is uniform over the entire circumferential surface of the core 32, which takes a lot of time and effort. The longer the core 32 is, the more delicate the adjustment is, and the task of removing the valve receiver 41 from the valve 38 described above becomes difficult because the valve receiver 41 must be loosened within the elongated air passage 40.

As described above, disassembling the conventional air valve 35 necessarily involves attaching and detaching the core 32 to the liner 32, which is very troublesome and time-consuming.

An object of the present invention is to provide a molded air valve structure that allows the air valve to be easily disassembled without the need for attaching and detaching the core to the liner.

Structure of the invention (means for solving problems) That is, as shown in the drawings of the embodiments described later, the invention engages the core 9 at the distal end of the core 2 so that it can be taken out in the distal direction, A valve receiver 19 is attached to the core 9 so as to be movable in the axial direction of the core 9.
A valve 16 is assembled so as to form contact surfaces 7 and 15 between the tip and the tip.

(Function) When removing this air valve from the core, remove the valve toward the tip of the core, and then pull out the core in the same direction toward the tip of the core. When assembling this valve to the core, the core is attached to the core from the tip of the core, and then the valve is attached from the tip of the core.

(Embodiment) An embodiment embodying this invention will be described below with reference to FIGS. 1 to 7.

As shown in FIG. 2, the base end of the core 2 is fixed to the liner 3, and when the upper mold 4 and lower mold 5 are closed, the liner 3 is held between the molds 4 and 5, and its position is controlled. It's becoming more common. and,
At this time, a cavity is formed between the core 2 and both dies 4 and 5. An air passage 6 communicating with an air supply port (not shown) is formed inside the core 2, and a first
As shown in the figure, the air passage 6 opens at the tip of the core 2. A tapered contact surface 7 whose diameter becomes larger toward the tip is formed in the opening, and a snap ring groove 8 is formed on the inner periphery of the core 2 at the back of the contact surface 7. A female thread 2a is formed.

As shown in FIG. 1, a cylindrical core 9 having a male thread 9a formed on the outer periphery is fixed to the female thread 2a so that the male thread 9a is screwed into the female thread 2a, and a snap ring 10 is fitted into the snap ring groove 8. As a result, the core 9 cannot rotate relative to the center core 2 and cannot be separated from the center core 2.

As shown in FIGS. 3 and 4, a sliding hole 11 is provided through the center of the core 9 so as to extend in the axial direction thereof, and the diameter of the opening at the tip of the hole 11 is enlarged. In addition, locking grooves 13 for locking tools for attaching and detaching the core 9 are recessed at four locations at equal intervals on the end face of the core 9, and the locking grooves 13
One of the grooves is connected to a rotation prevention groove 14 formed in the sliding hole 11, and the rotation prevention groove 14 is open to the outer periphery of the base end of the core 9.

As shown in FIGS. 1 and 5, a valve 16 having a tapered abutment surface 15 formed on the outer periphery is placed in the opening of the core 2, and the abutment surface 15 is brought into contact with the abutment surface 7 of the core 2. are arranged so that they touch each other. A hexagonal hole 16a is bored on the outer surface of the valve 16 for attaching and detaching it, and a male screw 17 is protruded from the opposite side thereof so as to be located in the sliding hole 11 of the core 9.

As shown in FIGS. 1, 6, and 7, within the sliding hole 11 of the core 9, a substantially columnar valve receiver 19 with a flange 18 formed at one end extends from the proximal end of the central core 2 in the axial direction thereof. is slidably inserted. This valve receiver 19 has a female thread 2 threaded in its tip.
By screwing the male thread 17 of the valve 16 into the hole, it is integrated with the valve 16 with the spring washer 21 in between. Further, the collar 1 of the valve receiver 19
A spring 22 is interposed between 8 and the core 9, and the spring 22 connects the valve receiver 19 to the center core 2.
By biasing toward the proximal end, the abutment surface 15 of the valve 16 is always pressed against the abutment surface 7 at the center 2. On the outer peripheral surface of the valve receiver 19, four ejection grooves 23 extending in the axial direction are formed at equal intervals, and the grooves 23 communicate the air passage 6 side of the core 2 with the valve 16 side. are doing. A set screw 24 is installed on the outer peripheral surface of the valve receiver 19.
is screwed in, and the same screw 24 is fitted into the rotation prevention groove 14 of the core 9, so that the valve receiver 19
is unable to rotate relative to the core 9.

Now, the operation of the air valve 1 configured as described above will be explained together with the molding operation of the molded product.

When the molding material passes through a sprue (not shown), fills the cavity, and solidifies, the upper mold 4 and lower mold 5 are opened to expose the core 2 to which the molded product is adhered. Next, when compressed air is fed into the air passage 6 of the core 2 through an air supply port (not shown), the air pushes the valve receiver 19 toward the tip of the core 2 and passes through the blowout groove 23. Similarly, push the valve 16 toward the tip. Therefore, the valve 16 protrudes from the tip of the core 2 against the spring 22, and the air blown out from between the core 2 and the valve 16 peels off the molded product from the core 2 and removes the base of the molded product. Run away from the edge. That is, the molded product is peeled off from the core 2 by this blown air.

Next, the case where the air valve 1 configured as described above is disassembled and removed from the core 2 and the case where it is assembled to the core 2 will be explained.

When removing the air valve 1 from the core 2, first insert a hexagonal wrench into the hexagonal hole 16a from the tip of the core 2 and rotate the valve 16. Then, as described above, the valve receiver 19 cannot rotate relative to the core 9, and the core 9 cannot rotate relative to the central core 2, so the valve 16
is screwed back from the valve receiver 19 and the spring washer 2
1 and can be taken out from the core 2 in the direction of its tip. Note that when the valve 16 is removed from the core 2, the valve receiver 19 moves toward the proximal end of the core 2 by the spring 22 and tries to separate from the core 9. The valve receiver 19 and the spring 22 remain integral with the core 9. Next, the core 9 is removed by removing the snap spring 10 and engaging the attachment/detachment tool in the locking groove 13.
is rotated to remove the core 9 together with the valve receiver 19 and spring 22 toward the distal end side of the core 2. After that, remove the setscrew 24 and remove the core 9.
Remove the valve receiver 19 from.

When assembling this air valve 1 to the core 2, the operations described above may be performed in reverse. That is, first, the valve receiver 19 is assembled to the core 9 via the spring 22, the valve receiver 19 is engaged with the core 9 by the set screw 24, and then,
The core 9 is screwed into the internal thread 2a of the core 2 and fixed within the core 2 with a snap spring 10. Further, the valve 16 is screwed into the valve receiver 19 via the spring washer 21.

As described above, the air valve 1 of this embodiment performs all the work when removing it from the core 2 for disassembly and cleaning and when assembling it to the core 2.
This can be done from the tip side. Therefore, during this work, it is necessary to remove the core 2 from the liner 3,
There is no need to perform work using the air passage 6 from the base end side of the core 2. Therefore, the time required for the above work can be reduced from about 6 hours in the conventional case to about 0.5 hours.

In this embodiment, a spring 22 is interposed when fixing the valve holder to the valve 16, but this spring 22 is not necessarily necessary. Further, the core 9 is screwed into the core 2, and after being linearly inserted into the core core,
It may be fixed with a mechanism that allows it to rotate slightly and be fixed to this core, or it may be attached to a key.

As described above, the present invention is not limited to the above embodiments, and may be modified as desired without departing from the spirit of the invention.

Effects of the Invention As detailed above, the present invention has the above-mentioned excellent effect for industrial use in that disassembly work can be easily performed without attaching or detaching the core to the liner.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the air valve structure of this embodiment, Fig. 2 is a sectional view showing the mold of this embodiment, and Fig. 3 is a sectional view showing the air valve structure of this embodiment.
The figure is a cross-sectional view of the core, Figure 4 is a front view of the core, and Figure 5 is a front view of the core.
Figure 6 is a side view of the valve, Figure 6 is a partially cutaway side view of the valve receiver, Figure 7 is a front view of the valve receiver, Figure 8 is a sectional view showing a conventional mold, and Figure 9 is a similar conventional mold. It is a sectional view showing an air valve structure. Air valve...1, Core...2, Liner...
3, Upper mold...4, Lower mold...5, Air passage...6,
Contact surface...7, core...9, contact surface...15, valve...16, valve receiver...19, spring...22, jet groove...23.

Claims (1)

[Scope of utility model registration request] The core 9 is engaged with the distal end of the core 2 so that it can be taken out in the distal direction, and the valve receiver 1 is connected to the core 9.
9 is mounted so as to be movable in the axial direction of the core 9, and the valve 1 is attached to the valve receiver 19 so as to form contact surfaces 7, 15 between the tip of the center core 2 and the valve receiver 19.
The air valve structure of the mold is characterized by the assembly of 6.