JPH06263105A - Levelling device in powder charging device - Google Patents

Abstract

PURPOSE:To improve productivity by providing as the parts of a device for levelling powder put in a container a dustpan-shaped trough which is provided with a levelling plate at its introducing edge and is vibrated by means of a vibration mechanism, and a recovering line for the outlets of the trough. CONSTITUTION:In a molding machine which produces thermoplastic resin molding under heat and pressure, a molding container 4 transported by a conveyor is charged with thermoplastic resin powder from a feed hopper, and a vibration- type levelling device 5, ahead in the direction in which the container is transported, levels the powder. This levelling device 5 is comprised of: a dustpan-shaped trough 6 having a levelling plate 8 at its introducing edge and outlets 9 and 10 in both its sides; a vibration mechanism 7 which causes the trough 6 to vibrate; and a recovering line 15 provided below the outlets 9 and 10. After an amount of the powder above the top edge of the molding container 4 is removed by the levelling plate 8, it is ejected into the recovering line 15 by causing it to move upwards in the trough 6 by means of vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to powders, beads, pellets, and mixtures of the same, for example, in order to produce a heated / pressurized molded product of a thermoplastic resin. Generically) in a required molding container, and more specifically, in order to constantly fill the molding container with a fixed amount, the rising portion of the packing from the molding container and the uneven surface of the packing To scrape off to form a flat surface.

[0002]

2. Description of the Related Art Conventionally, as such a scraping device, as shown in FIGS. 4 and 5, after powder from a hopper is received by a vibrating feeder into a flat shaped container and the container is vibrated. In addition, the molding container (51) with respect to the round bar (52) or the inclined flat plate (53) provided along the upper side of the molding container (51).
To move the molding container (51) or vice versa, scraping off the rising part of the filling from the molding container (5) and the uneven surface (54) of the filling to form a flat surface. (See JP-A-62-168804)

[0003]

However, the following problems have been encountered in the scraping using the scraping jig such as the round bar or the flat plate as described above. That is, (1) When scraping off with a round bar or a flat plate, powder is always deposited on the front side of the scraping jig in the jig advancing direction, and powder is accumulated. A part of the collected powder is pushed into the filling material by the pressing force of the jig as the scraping jig advances. This has led to variations in packing density as shown in (a) and (b) below.

(A) Since the amount of powder accumulated increases from the scraping start portion to the scraping end portion (see FIGS. 4 and 5), more powder is contained in the container at the scraping end portion than at the scraping end portion. As a result of being pushed in, the powder density at the scraping end portion becomes higher than that at the start portion.

(B) The accumulation of powder occurs more in the width center than in both sides of the packing, so that the packing density in the width center is higher than that in both sides.

As a result of the phenomena of (a) and (b), the powder filled in the molding container has a high packing density as it goes from the scraping start part to the scraping end part and from both sides to the width center part. Have. For this reason, if the powder thus nonuniformly filled is directly heated and pressed to form the synthetic resin plate, the thickness becomes large at the portion where the packing density is high. That is, as shown in FIG. 6, the thickness of the obtained synthetic resin plate increases from the end portion (55) corresponding to the scraping start portion to the end portion (56) corresponding to the end portion thereof, and As shown in FIG. 7, the thickness increases from both side portions (57) of the synthetic resin plate toward the width center portion (58).

(2) If necessary, a plasticizer may be added to the powder of the thermoplastic resin. However, if the powder is sticky, it may be extra when scraping with a round bar or a flat plate. In addition to the removal of unnecessary powder, the powder that should remain in the container may be caught by the scraping jig and removed from the surface of the filling material. This causes uneven filling on the surface and significantly reduces the surface texture of the molded product.

(3) When a pattern is attached to a molded product by filling a mixture of a synthetic resin or an inorganic substance composed of a plurality of different types, different types, and different colors, if powder accumulation occurs due to scraping, a large grain size The body or linear particles are subjected to a shearing force on the particles as the scraping jig moves, and are pulled by the jig to float on the surface or form a directional array. As a result, the surface condition of the mixed filling is impaired.
That is, the surface state of the mixture uniformly dispersed at the scraping start portion has a different pattern at the end portion.

(4) If powder accumulation due to scraping occurs, there are problems as described in (1) to (3) above. Therefore, depending on the state of the powder, the amount of powder to be supplied to the molding container may be required. It is necessary to adjust the powder supply amount very strictly so that there is no shortage with respect to the amount and it does not rise as much as possible from the container, that is, the accumulation of powder due to scraping occurs as much as possible. It hinders the improvement of sex.

It is an object of the present invention to provide a scraping device for a powder or granular material filling device which can solve all the problems of the prior art.

[0011]

The present invention has been devised in order to achieve the above-mentioned object, and the cause of the above problems is that the removal of powder that has risen from the molding container is caused by the use of a round bar or a flat plate. Focusing on the accumulation of powder that occurs when using a scraping jig like this, in order to prevent scraping from affecting the powder filled in the container, The purpose is to scrape off the powder without generating it.

That is, the scraping device in the powder or granular material filling device according to the present invention has a scraping plate at the introduction end and at least one scraping device as the scraping device for the powder or granular material filled in the molding container of the powder or granular material filling device. The present invention is characterized by disposing a vibrating scraping device including a dust removing trough having an outlet, a vibrating mechanism for vibrating the trough, and a recovery line provided below the outlet.

The scraping plate is preferably an inclined plate.

The outlets are preferably provided on the left and right side walls of the trough, respectively.

It is preferable to provide a guide wall inside the trough for guiding the powder from the introduction portion to the outlet. A guide groove may be provided instead of the guide wall.

As the vibrating mechanism, an electromagnetic type or an electric motor driven type can be applied.

The dust removing trough is installed in an inclined shape at a required angle α (2 to 15 degrees) with respect to the upper edge level of the molding container.

[0018]

According to the present invention, since the scraping is carried out by using the vibrating scraping device, the granular material on the trough is scraped up by the vibration given to the trough, and sequentially from the trough outlet. It is carried out to the collection line.
Therefore, the accumulation of powder particles does not occur due to the scraping.

Therefore, at the scraping start portion and the scraping start portion, or at the width center portion and both side portions of the molding container, there is no variation in the packing density of the granular material, and the packing density is extremely high without impairing the surface condition at the scraping. It becomes possible to uniformly fill the granular material.

[0020]

EXAMPLES In order to describe the present invention more specifically,
The Example of this invention is shown.

FIG. 1 shows a main part of a molding machine for manufacturing a heat-pressed product of a thermoplastic resin. Thermoplastic powders flow from feeder hopper (1) to traverse feeder (2)
Forming container (4) located on the chain conveyor (3) via
Is supplied to. The molding container (4) filled with the powder is transferred to the front (right side in FIG. 1) by the chain conveyor (3) and the roller conveyor (17).

A vibrating scraping device (5) according to the present invention is provided in front of the moving direction of the molding container (4) filled with powder.

As shown in FIG. 2, the vibrating scraping device (5) has a scraping plate (8) at the introduction end and outlets on both side walls.
(9) Dust removal trough (6) with (10) and trough (6)
It is mainly composed of a vibrating mechanism (7) for vibrating the and a recovery line (15) provided below the outlets (9, 10).

The scraping plate (8) is composed of an inclined plate, and is connected to the opening end for introducing the trough (6) in a protruding manner. The tip level of the scraping plate (8) matches the upper edge level of the molding container (4). Dust collector trough (6) is molded container (4)
It is installed in an inclined shape at a required angle α (10 degrees) with respect to the upper edge level (see FIG. 3).

Inside the trough (6), guide walls (11) and (12) for guiding the powder from the inlet to the outlets (9) and (10) are provided.
Outflow passages (13) and (14) are provided in a protruding shape outside the outlets (9) and (10), respectively. The vibrating device (7) is of an electric motor drive type, and as shown in FIG. 1, has a coil spring (18) and a vibrator (16) as main components. Amplitude 300 ~ 500μ on trough (6) by vibrating device (7)
(Maximum 1 mm) and vibration with a frequency of 60 Hz are applied in the direction of arrow (A) in FIG.

The groove type recovery line (15) provided below the outlets (9) (10) moves in the direction orthogonal to the moving direction of the molding container (4), and the outflow passages (13) (14). The recovered powder discharged from the hopper is received through the hoppers (19) and (20) and sent to a required position.

In the vibrating scraping device (5) of the above construction, when the molding container (4) filled with the powder moves forward at a speed of 5 m / min to reach the scraping device (5) and passes under it. The swelling plate (8) of the trough (6) scrapes off the swelling part of the powder. This scraped part is a trough
The vibrations given to (6) lifted up the slanted trough (6), and the guide walls (11) and (12) left and right outlets.
(9) It is guided to (10), and from there, it flows down to the recovery line (15) via the outflow passages (13) (14) and the hoppers (19) (20), and is carried to the required position. The moving speed of the powder in the trough (6) is changed by changing the voltage of the vibration device (7).
It is controlled by adjusting the amplitude and frequency of.

Although this embodiment is intended for thermoplastic resin powder, other objects such as beads, pellets, and mixtures thereof may be changed in the setting conditions of the vibrating scraping device (5). Therefore, the scraping can be performed by the same operation as this.

[0029]

According to the scraping device of the present invention, the following effects can be obtained because the accumulation of powder particles due to scraping does not occur.

(1) Since the powder or granules can be uniformly filled in the molding container, the thickness accuracy of the molded product obtained by molding the filled powder or granules by heating or pressing can be dramatically improved. it can.

(2) Even if the powdery or granular material has an unfavorable property such as stickiness, it is possible to scrape off only the swelling portion from the molding container without any trouble, and the surface after scraping off is smooth.

(3) Even if the molded product is filled with a mixture of different, irregularly shaped and differently colored products, even if the mixture has a large particle diameter, shearing force is not applied to the powder or granular material by scraping. Along with this, a uniform pattern is obtained without being lifted up on the surface.

(4) As a result of (1) to (3), since the filled powder and granules are not affected by scraping, it suffices to take care not to make the supply amount of the powder and granules insufficient. You can go through a strict amount adjustment. Therefore, the speed of the production line can be increased and the yield can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a molding machine for manufacturing a heated / pressurized molded product of a thermoplastic resin.

FIG. 2 is a perspective view showing a vibrating scraping device.

FIG. 3 is a side view showing a vibrating scraping state.

FIG. 4 is a side view showing a scraped state by a conventional scraping jig.

FIG. 5 is a side view showing a scraped state by a conventional scraping jig.

FIG. 6 is a side view of a molded product produced by a conventional scraping jig.

FIG. 7 is a front view of a molded product produced by a conventional scraping jig.

[Explanation of symbols]

 4: Molding container 5: Excitation type scraping device 6: Trough 7: Excitation mechanism 8: Scribing plate 9, 10: Exit 11, 12: Guide plate 15: Recovery line

Claims (1)

[Claims] 1. A scraping device for scraping powder or granules filled in a molding container of a powder or granule filling device, and a dust removing trough having a scraping plate at an introduction end and having at least one outlet, and a vibrating trough. A scraping device in a powder and granular material filling device, characterized in that a vibrating scraping device equipped with a vibrating mechanism for giving a pressure and a recovery line provided below the outlet is arranged.