JPS5929829Y2 - Equipment for removing raw material adhering to the punch tip of a rotary powder compression molding machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for removing raw material adhering to a punch tip used in a rotary powder compression molding machine or the like.

In a rotary powder compression molding machine, such as a tablet press, the powdered raw material shown in the figure is compressed and molded by inserting upper and lower punches from above and below into holes provided at the periphery of the rotary disk. A portion of the powdered raw material adheres to the tips of the upper and lower punches due to the action of the generated compression heat.

Particularly if the powdered raw material contains sugar or has high deliquescent properties, adhesion becomes significant.As the raw material adheres to the tip of the punch, it grows and becomes a factor in the weight fluctuation of the powdered raw material that is then compression-molded. At the same time, there is a drawback that part of the compressed molded product may peel off, damaging the surface of the molded product and impairing its marketability.Furthermore, when manufacturing laminated tablets, powdered raw materials adhering to the punch tip may be transferred. This has disadvantages such as impairing the marketability of the molded product.

Therefore, conventionally, various adhesion material removal devices have been provided that rub the tip surface of the punch with two bristles, but in all of these devices, the direction of rubbing against the tip surface of the punch is constant, so the bristles are bent and curled. It was not possible to effectively remove the adhering material.

In particular, when the punch tip surface has irregularities, the corners formed at the boundaries of the irregularities (where raw materials are most likely to adhere) become blind spots.
It was almost impossible to reliably remove the raw material adhering to this part.

This invention was devised based on the above circumstances, and its purpose is to change the direction of brush bristles relative to the punch tip surface to opposite directions at high speed. To provide a device for removing raw material adhering to a punch tip of a rotary powder compression molding machine with a simple structure and capable of reliably removing powder raw material adhered to a punch tip having unevenness.

An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

In the figure, reference numeral 1 denotes a rotary disk, and dies 2 are provided at regular intervals on the same circumference at the periphery of the rotary disk 1, and upper punches facing the dies 2 are provided on the rotary disk 1. 3 and a lower punch 4 are provided so as to be slidable in the vertical direction.

The tip of the lower punch 4 is inserted in advance into the mortar hole of the mortar 2 and forms the bottom of the hole. be done.

), a predetermined amount of powder raw material filled in the mortar 2 is compressed and molded.

In addition, 5 in the figure is a fixed part, which is the part from the time after the compression molded product is taken out with a scraper (not shown) until the mortar 2 reaches the powder raw material feeder, In addition to the above-mentioned parts, in the molding machine to be manufactured, the molding machine is also installed in the part between the time when the compression molding is completed in the previous stage and the powder raw material feeder that further supplies the powder raw material to be stacked in the same mouth. .

The fixed portion 5 supports an attached raw material removing device 6.

Next, in detail about this device 6, reference numeral 7 denotes a pivot provided upright on the fixing portion 5, into which, for example, approximately the center portion in the longitudinal direction of the removal member 8 is fitted. The removal member 8 is rotatable in a horizontal plane.

One end of the removing member 8 is, for example, shaped like a rectangle in plan and has a button, and brush bristles 9 are attached to the upper and lower surfaces of the removing member 8, respectively.

This one end portion is located so as to intersect the locus of rotation of the upper and lower rods 3 and 40, so that the tip surface of the moving upper and lower rods 3.4 passes through the brush bristles 9.

Further, on the other end side of the removing member 8, there is provided an operating mechanism 10 for swinging the member 8 at high speed.

The operating mechanism 10 includes a long hole 11 bored in the other end of the removal member 8 having a rectangular planar shape, an electric motor 12 attached to the fixed part 5, and an electric motor 12 attached to the rotating shaft 13 of the motor 12. The shape is derived from the eccentric cam 14 fitted into the elongated hole 11.

In addition, in the configuration of this removing device 6, the position of the pivot axis T, the dimension from the cutting axis I to the brush bristles 9, and the eccentric cam 1
The number of revolutions of 40 should be set appropriately so that the tip of the pestle continues to contact the brush bristles 9 while the bristles 9 swing several times or more depending on the rotation speed of the rotary disk 1, the type of powder raw material, etc. Of course.

In addition, 15 in the figure is a dust suction nozzle that communicates with the vacuum suction mechanism 16 and has a suction port opened by pressing a button near the brush bristles 9.
This is for recovering the removed adhering materials.

According to the structure explained above, after the powder raw material in the mortar 2 is compressed by 10 rotations of the rotary disk, the %i portions of the upper punch 3 and the lower punch 4 pass through the brush bristles 9. At this time, the adhering raw material is removed by being rubbed by the brush bristles 9.

In this case, the removing member 8 swings at high speed in the horizontal direction about the pivot shaft 7 as the eccentric cam 14 rotates eccentrically due to the rotation of the electric motor 12. While doing this, reverse the direction of rubbing the tip of the pestle several times.

Moreover, this makes it possible to reliably remove the powdered raw material firmly attached to the punch tip, and when the punch tips of the upper and lower columns 3 and 4 have unevenness as shown in FIG. Also, the blind spot X formed when the brush bristles 9 move in the direction of arrow A is caused by the tip of the bristles 9 entering when the bristles 9 move in the direction of arrow B (see the two-dot chain line in the figure). )
Since this is repeated several times or more, it is possible to reliably remove powdered raw materials that are firmly attached thereto.

Note that this invention is not limited to the above embodiment.

For example, as shown in FIG. 4, a long hole 11 is formed in a direction perpendicular to the longitudinal direction of the removal member 8, and an eccentric cam 14 is fitted into the long hole 11. Similar effects can be obtained even if the operating mechanism 10 is configured to be slidably supported by the removal member 8, and the removal member 8 is moved at high speed in the front and rear directions within a horizontal plane.

Since this device is as explained above, it is possible to reliably remove powdered raw materials attached to a flat punch tip as well as powdered raw materials attached to an uneven punch tip, and the removal member is a single one. In addition, since the operating mechanism is formed of a long hole, an eccentric cam, and an electric motor, the removal member can be operated reliably at high speed even though it has a very simple structure. Therefore, its practical effect is extremely high. It's large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of this invention, Fig. 2 is a plan view of the same side, Fig. 3 is an enlarged sectional view showing the relationship between the uneven punch tip and brush bristles, and Fig. 4. FIG. 2 is a plan view showing another embodiment of this invention. 6... Adhesive raw material removal device, 7... Pivot, 8... Removal member, 9... Brush bristles,
10...Operating mechanism, 11...Elongated hole, 1
2... Electric motor, 13... Rotating shaft,
14... Eccentric cam, 1γ... Guide.

Claims (1)

[Scope of Claim for Utility Model Registration] On the upper and lower surfaces of one end located between the upper and lower punches, which are provided so as to be slidable in the vertical direction facing each other on the rotary disk, the top and bottom surfaces of the upper and lower punches and the tip surfaces of the upper and lower punches. It is formed by a single removal member provided with brush bristles in contact with each other, a long hole provided at the other end of this removal member, an eccentric cam fitted into the long hole, and an electric motor that rotates this eccentric cam. and an operating mechanism for reciprocating the removal member at high speed in a horizontal plane.