JPS6217187Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scraping device installed in a rotary powder molding machine.

The molding cycle of the rotary powder molding machine is as follows. That is, as shown in the states from A to B in FIG. 1, as the lower punch 1 is lowered by the lowering device 2, the powder in the powder feeder 4 is sucked into the mortar 3. Next, as shown in state C, the lower punch 1 is pushed up on the weight adjustment track 5 whose vertical position is manually or automatically adjusted as necessary, so that the powder sucked into the mortar 3 is reduced. At the same time, the discharged excess powder is scraped off with a scraping plate 6 and weighed. After this, lower the lower punch 1 a little as shown in state d, and lower the upper punch 7 to the mortar 3.
After inserting it into the interior, the upper and lower punches 7 and 1 are moved in the axial direction by pressure rolls 8, respectively, to perform compression, as shown in state E. Finally, as shown in state F, the upper punch 7 is raised and the lower punch 1 is pushed up on the thrust track 9 to project the molded product A out of the mortar 3. Take it out from the top of B.

Incidentally, the scraping plate 6 has conventionally been constructed of the end wall of the powder feeder 4, and is disposed to intersect with the locus of movement of the mortar 3, making it immovable.

With such a conventional scraping structure, the powder in the mortar is likely to be dragged by the excess powder that is collected and moved during scraping. For this reason, part of the powder inside the mortar is scooped out at the same time as scraping.
There was a tendency for the powder in the mortar to become uneven. This was particularly noticeable when the depth of powder filling in the mortar after discharging was shallow and when the particle size of the powder was small. For this reason, in the past, the weight variation of the products increased, and the products were prone to cracks and defects.

Therefore, an object of the present invention is to provide a scraping device for a rotary powder molding machine that can eliminate the above-mentioned conventional problems during scraping.

That is, the present invention has an endless scraping belt whose side end surface along the width direction is in contact with the upper surface of the rotary disk on which the mortar is attached, and which is provided so as to intersect with the rotation locus of the mortar at the terminal end of the powder feeder, and this endless scraping belt. It is characterized by comprising a drive mechanism that causes the belt to run endlessly.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

In the figure, reference numeral 11 indicates dies that are arranged at regular intervals on the same circumference of a rotary disk (not shown), and the upper part of a lower punch (not shown) that can be moved up and down is inserted into the hole of the dies. In the figure, reference numeral 12 denotes a powder feeder placed on the rotary disk along the rotation trajectory A portion of the powder sucked into the mortar hole by the ascent is discharged. The powder feeder 12 is supported by a fixing member (not shown).

A scraping device 13 is provided at the end of the powder feeder 12.
is provided. This device 13 includes an endless scraping belt 14 and a drive mechanism 15.

The endless scraping belt 14 is provided at the terminal end of the powder feeder 12 with a side end surface along the width direction of the belt 14 in contact with the upper surface of the rotary disk. At the same time, the endless belt 14 is arranged to intersect with the rotation locus X of the mill 12. Note that it is more preferable that the crossing angle θ is smaller. The end of the powder feeder 12 is closed by the endless scraping belt 14, and a powder outlet 16 is formed between the belt 14 and the end of one side wall of the powder feeder 12.
Incidentally, the surplus powder discharged from the outlet 16 is collected by the rotation of the rotary disk into a collection port (not shown) provided on the opposite side of the terminal end of the powder supply device 12. The drive mechanism 15 also includes the endless belt 1
4 is made to run endlessly, and includes a drive pulley 17 around which the belt 14 is wound, a driven pulley 18,
and a motor 19 that rotates the drive pulley 17. It is preferable to use a motor 19 whose speed can be adjusted according to the physical properties of the powder, and the drive mechanism 15 may be provided with a tension roller if necessary.

In the scraping device 13, by operating the motor 19 of the drive mechanism 15, the endless scraping belt 14 is run endlessly in the direction of arrow Y in FIG. Therefore, when the mill 11 moving in the direction of arrow Z in FIG. 2 passes under the endless scraping belt 14, the powder discharged from the mill hole is scraped off, and the scraped excess powder Exit 16. In this case, since the scraping is carried out by the endless scraping belt 14 that runs endlessly, the powder on the mortar hole is quickly carried out of the mortar hole little by little, and the excess powder scraped off as scraping progresses as in the conventional method. It does not stick up along the scraping plate and stay on the mortar hole for a long time. For this reason,
At the same time as scraping, part of the powder in the mortar 11 is prevented from being gouged out or being shifted to one side. Therefore, even if the final filling depth is, for example, 1/10 or less of the diameter of the mortar hole of the mortar 11, that is, the diameter of the product, it is possible to prevent variations in weight of thin products to be molded, and to prevent uneven density of the product. This prevents cracking and damage to the product.

In implementing the present invention, the specific structure, shape, position, material, etc. of the scraping endless belt, drive mechanism, etc. shall be limited to the above-mentioned embodiment unless it contradicts the gist of the invention. Of course, the present invention can be configured and implemented in various ways.

Since the present invention described above has the structure described in the above-mentioned utility model registration claim, the scraping by the endless running of the endless scraping belt eliminates the deviation of the powder in the mortar and the hole in the mortar due to scraping. This has the effect of preventing powder from being gouged out.

[Brief explanation of drawings]

FIG. 1 is a developed view for explaining the molding cycle of a rotary powder molding machine, and FIG. 2 is a schematic cross-sectional plan view showing an embodiment of the present invention. 11... Mortar, 12... Powder feeder, 13... Scraping device, 14... Endless scraping belt, 15... Drive mechanism.

Claims (1)

[Scope of utility model registration request] an endless scraping belt whose side end surface along the width direction is in contact with the upper surface of the rotary disk on which the mortar is attached, and which is provided so as to intersect the rotation locus of the mortar at the terminal end of the powder feeder;
A scraping device for a rotary powder molding machine, comprising a drive mechanism that causes the endless belt to run endlessly.