JPS5951891B2 - Hopper device for distributing raw materials in foam molding machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a hopper device for distributing raw materials in a foam molding machine.

Generally, in a foam molding machine, the pre-foamed raw material is stored in a maturing silo, and after completion of maturing, the air is blown to the raw material distribution hopper installed in the molding machine, and from the raw material distribution J hopper to the mold cavity via the raw material filling device. Molded products are manufactured by feeding, heating, and cooling in a well-known manner, but pre-foamed raw materials cannot have uniform specific gravity and size due to variations in the raw materials for pre-foaming and the raw materials in the pre-foaming process. It is difficult to obtain things.

The raw materials sent to the raw material distribution hopper are agitated by the air flow and are separated into those with high specific gravity and those with low specific gravity, and the heavy ones are deposited near the raw material inlet,
Lighter particles accumulate farther away, larger particles roll further away, and smaller particles accumulate near the raw material inlet. For this reason, the specific gravity of the raw material differs depending on the location within the distribution hopper, but in the conventional distribution hopper, as shown in FIGS. Since a feeding inlet 22 is provided and a plurality of distribution ports 23 for taking out raw materials are provided in series on the bottom surface, a difference in specific gravity occurs in the raw materials depending on the position of the raw material distribution ports 23, and the raw materials are sent as they are to the mold cavity. Therefore, there was a drawback that the weight of the molded product varied and the uniformity of the molded product was impaired. In order to eliminate such drawbacks, the present invention provides a raw material inlet at the center of the upper surface of the hopper main body, which has a circular horizontal cross section, and a plurality of raw material distribution holes concentrically with respect to the raw material inlet below the hopper body. A hopper device for distributing raw materials in a foam molding machine equipped with a spout is provided.

Embodiments of the present invention will be described with reference to the drawings. In FIGS. 3 and 4, 1 is a hopper main body, the upper part of which is formed into a cylindrical shape, and the raw material inlet 2 is provided in the center of the upper surface, and the lower part is formed into a cylindrical shape. It is formed into an inverted conical shape, and a plurality of raw material distribution ports 3 are arranged at appropriate intervals on a concentric circle with respect to the raw material inlet 2 at the center of the bottom surface. be.

Reference numeral 4 denotes an opening/closing device for the distribution port 3 disposed on the lower surface close to the raw material distribution port 3, which rotates a disk-shaped rotary shutter 1 having a port 5 corresponding to the distribution port 3 by a central shaft 7. Distribution port 3
It is designed to open and close.

Reference numeral 8 designates a support body for the rotary shutter 16, which is provided with a port 9 corresponding to the raw material distribution port 3.

Reference numeral 10 denotes a blow pack air outlet provided at the bottom of the main body 1 of the hot spring.

Reference numeral 11 denotes an air venting device installed at the raw material inlet 2, which blows a mixed flow of raw materials and air through a downward T-shaped tube 13 opened on the top surface of the container body 12 formed of a wire mesh, and the air is released to the outside through the wire mesh. Only the raw material is allowed to naturally fall into the hopper body 1 through the raw material inlet 2.

To explain the operation of the above embodiment, the pre-foamed raw material blown from the aging silo (not shown) is sent to the hopper main body 1 via the air venting device 11.
At this time, only the air in the mixed flow of raw material and air blown from the T-shaped pipe 13 is discharged to the outside of the container body 12 through the wire mesh, and the raw material. The material falls into the hopper body 1 through the raw material inlet 2 and is deposited, and is filled into the plural cavities of the mold through the raw material filling device (not shown) from each distribution port 3. In the present invention, the raw material distribution port 3 is arranged concentrically with respect to the raw material inlet 2, so that despite the deflection of the raw material due to the influence of blown air, it is possible to The raw material is sent to each distribution port 3, thereby eliminating variations in the raw material at each distribution port 3, and making the weight of the raw material in each cavity uniform, resulting in a high-quality molded product.

5 and 6 show another embodiment of the present invention, in which the hopper main body 1a is formed into a cylindrical shape, and a material inlet 2a provided at the center of the upper surface is provided below the raw material inlet 2a on a concentric circle with the inlet 2a. A plurality of raw material distribution ports 3a are arranged at appropriate intervals around the bottom surface.

Reference numeral 14a denotes a shielding plate provided on the inner surface of the upper circumferential wall of the hopper body 1a, which is inclined inwardly and downwardly from the inner wall surface of the hopper body 1a, together with an inclined plate 15a protruding from the center of the bottom surface of the hopper body 1a. The raw material in the hopper main body 1a is smoothly guided to the distribution port 3a, and a raw material filling device (not shown) is used.
This is to facilitate the discharge of the blow pack air, and the other configurations and functions and effects are the same as those of the embodiment described above.

7 and 8 show still another embodiment, in which the hopper body 1b is formed into a cylindrical shape and the hopper body 1b
A plurality of raw material distribution ports 3b are provided at appropriate intervals on the lower end of the peripheral wall surface of the
A cylindrical rotary shutter 6b is provided with a through hole 5b corresponding to the distribution port 3b close to its outer periphery, and a support body 8b is provided with a through hole 9b corresponding to the raw material distribution port 3b. The device 4b is provided, and the other configurations, functions, and effects are the same as those of the previous embodiment.

FIG. 9 shows the opening/closing device 4C of the raw material distribution port 3C separated from the hopper main body 1C and connected to the raw material distribution port 3C via piping 16C.
The slide plate 6C of the opening/closing device 4C is driven by the air cylinder 17C to open/close the opening/closing device 4C, so that the opening/closing device 4C can be placed at any position and the hopper device can be manufactured easily. It was designed so that Next, a conventional rectangular hopper as shown in FIG. 10, a cylindrical hopper as shown in FIG.
Using a cylindrical hopper with an air vent as shown in the figure, a fish box having a rectangular cross section with lengths of each side of 547 mm and 350 mm, height of 140 mm, and wall thickness of 25 mm as shown in Figure 13 is constructed. The results of molding using a seven-cavity mold are shown below. However, the apparent density of foam particles is 18gr.
It was hot in the river. As described above, the present invention provides a raw material inlet at the center of the upper surface of a hopper body having a circular cross section in the horizontal direction, and a plurality of raw material distribution ports are provided below the raw material inlet in a concentric circle with respect to the raw material inlet. Since this relates to a hopper device for distributing raw materials in a foam molding machine, the distance from the raw material inlet to each raw material distribution port is constant, and the raw material at a position within the hopper body is connected to the raw material distribution port. Since the weight of the raw material is uniformly sent to each distribution port, there is no variation in the weight of the raw material at each distribution port, and the weight of the raw material filled into the mold cavity is constant, making it possible to obtain a high-quality molded product.

Furthermore, by providing an air venting device at the raw material inlet of the hopper main body, this tendency is further promoted.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention in comparison with a conventional embodiment, and FIG. 1 is a simplified vertical sectional view of the conventional embodiment, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a simplified vertical cross-sectional view of an embodiment of the present invention, and FIG. 4 is a B--
5 is a simplified vertical sectional view showing another embodiment of the present invention, FIG. 6 is a sectional view taken along line C-C in FIG. 5, and FIG. 7 is a further embodiment of the present invention. FIG. 8 is a sectional view taken along the line D-D, FIG. 9 is a longitudinal sectional view showing an embodiment in which the opening/closing device is separated from the hopper body, and FIG.
Figure 0 is a perspective view of the rectangular cross-section hopper used in the experiment.
Fig. 11 is a perspective view of the same cylindrical hopper, Fig. 12 is a perspective view of a cylindrical hopper with an air venting device, and Fig. 13 is a perspective view of a fish box formed using the experimental equipment. 1, 1a, 1b, 1c...hopper body, 2,
2a, 2b, 2c... Raw material inlet, 3, 3a,
3b, 3c... Raw material distribution port, 4, 4a, 4b,
4c...Switching device, 11, 11a, 11b, 1
1c... Air venting device.

Claims (1)

[Scope of Claims] 1. A raw material inlet is provided at the center of the upper surface of the hopper body, which has a circular cross section in the horizontal direction, and a plurality of raw material distribution ports are provided below in a concentric circle with respect to the raw material inlet. A hopper device for distributing raw materials in a foam molding machine, characterized by: 2. A hopper device for distributing raw material in a foam molding machine according to claim 1, wherein an air venting device is provided at the raw material inlet. 3 Claim 1 in which the raw material distribution port is provided with an opening/closing device
A hopper device for distributing raw materials in a foam molding machine according to item 1 or 2. 4 Separate the opening/closing device of the raw material distribution port from the hopper body,
A hopper device for distributing raw material in a foam molding machine according to claim 1, 2 or 3, which is connected and communicated with a raw material distribution port via piping. 5 The upper part of the hopper body is formed into a cylindrical shape, the lower part is formed into an inverted conical shape, and the raw material distribution port is disposed at the center of the bottom surface of the hopper body.Claims 1, 2, and 3 A hopper device for distributing raw materials in a foam molding machine according to item 1 or 4. 6. The raw material in the foam molding machine according to claim 1, 2, 3, or 4, wherein the hopper body is formed into a cylindrical shape and the raw material distribution port is arranged around the bottom of the hopper body. Distribution hopper equipment. 7. Claim 1, in which the hopper body is formed into a cylindrical shape, and the raw material distribution port is disposed at the lower end of the peripheral wall surface of the hopper body.
A hopper device for distributing raw materials in a foam molding machine according to item 1, 2, 3, or 4.