JP3045097U - Rotary powder compression molding machine - Google Patents

Abstract

(57) [Summary] When detecting the push-up pressure of a lower punch, it is difficult for a plurality of lower punches to reach the detection portion at the same time and to detect the push-up pressure of each one. The rotary powder compression molding machine has a rotary disk (3) disposed in a frame (1) via a vertical shaft (2) so as to be horizontally rotatable, and a plurality of dies (4) provided on the rotary disk at a predetermined pitch. The upper punch 5 and the lower punch 6 are vertically slidably held above and below each of the dies 4, and the tip of the upper punch 5 is inserted into the dies 4.
And the lower punch 6 are guided by a guide rail to pass between the upper roll 7 and the lower roll 8 to compress and form the powder filled in the die 4. The powder is provided on a guide rail for guiding the lower punch 6. An opening 31c, a push-up pressure detection rail 40 that is provided in the opening 31c so as to be able to move up and down flush with the upper surface of the guide rail, and one lower punch 6 that is provided below the push-up pressure detection rail 40 are provided. And a pressure detecting element for detecting a push-up pressure when mounted on the push-up pressure detection rail 40.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a rotary powder compression molding machine for molding and commercializing powders of pharmaceuticals, foods, electric parts, and the like, and in particular, to accurately detect a pushing force of a lower punch for each lower punch. And a rotary type powder compression molding machine.

[0002]

[Prior art]

 The rotary powder compression molding machine sequentially introduces powder into a die held by a rotary disk, and holds the powder in each die by an upper punch and a lower punch. It is configured so that the powder in each die can be sequentially compression-molded when the lower punch and the lower punch pass between the compression rolls. In this type of rotary powder compression molding machine, when the product is taken out of the die after the powder is compacted, the pressing force of the lower punch is detected, and the capping, where the surface of the molded product peels off, is detected. In addition, it is designed to prevent the occurrence of problems such as binding that damages the side surface and lamination that breaks into layers.

That is, when the powder is repeatedly compressed, the powder gradually adheres to the tip portion of the lower punch and the inner surface of the die. When the powder starts to adhere, a high pressure is required to slide the lower punch, and the above-mentioned problem occurs. In order to prevent such problems beforehand, the push-up pressure of the lower punch at the time of product removal is detected, and an attempt is made to detect the adhesion of the powder by increasing the push-up pressure. In order to detect the push-up pressure of the lower punch, a guide rail for guiding the lower punch, that is, a part of the tablet push-up rail after compression molding is configured to be movable up and down, and a load cell is provided below the movable portion. There is known a device in which a push-up pressure is detected by arranging a push-up pressure. Specifically, a tablet lifting rail is provided in the form of a cantilevered arm, and the rail is swung up and down to apply pressure to the load cell.

[0004]

[Problems to be Solved by the Invention] By the way, when the push-up pressure is detected by using a part of the tablet push-up rail as described above, a rail portion for detection becomes long, and a plurality of lower portions are provided on the rail portion. The pestle will rest. In practice, it is necessary to detect the push-up pressure of each lower punch, but the push-up pressures of a plurality of lower punches are simultaneously detected, and the desired pressure cannot be detected. For this reason, it is difficult to determine which lower punch has the powder attached thereto and the abnormality is occurring, and there is a case where a countermeasure after the occurrence of the abnormality such as stopping the operation is delayed.

The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a rotary powder compression molding device capable of detecting an abnormality of a lower punch for each lower punch. Is to offer a machine.

[0006]

[Means for Solving the Problems]

 The present invention takes the following measures to achieve such an object. That is, in the rotary powder compression molding machine according to the present invention, the push-up pressure detection rail having at least the upper end area corresponding to one lower punch is provided on the guide rail for guiding the lower punch from the opening provided in the guide rail. It is arranged so as to be exposed, and a pressure is applied to the pressure detecting element by one lower punch being pressed against the push-up pressure detecting rail. With such a structure, the pressure detecting element always outputs a signal corresponding to the push-up pressure of one lower punch, so that it is possible to determine only an abnormal one among a plurality of lower punches. .

[0007]

[Embodiment of the invention]

 In the present invention, a rotating disk is horizontally rotatably arranged in a frame via a vertical shaft, a plurality of dies are provided on the rotating disk at a predetermined pitch, and an upper punch and a lower punch are vertically arranged above and below each mill. The powder filled in the mortar is held slidably by guiding the upper and lower pestle with the tip of the pierce inserted into the mortar and passing between the upper and lower rolls by guiding the rails. In a rotary powder compression molding machine designed to perform compression molding, an opening provided in a guide rail in which a lower punch is located, and a push-up pressure detection disposed in the opening so as to be able to move up and down flush with the upper surface of the guide rail. A rotary type comprising: a rail; and a pressure detecting element disposed below the lifting pressure detection rail and configured to detect a lifting pressure when one lower punch is placed on the lifting pressure detection rail. It is a powder compression molding machine.

In order to accurately detect the push-up pressure, a compression load cell is preferable as the push-up pressure detecting element.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the overall configuration of the rotary powder compression molding machine of the present invention. In this rotary powder compression molding machine, a rotating disk 3 is disposed in a frame 1 via a vertical shaft 2 so as to be horizontally rotatable, and a plurality of dies 4 are provided on the rotating disk 3 at a predetermined pitch. An upper punch 5 and a lower punch 6 are vertically slidably held above and below the mortar 4. When the tip of each of the upper punch 5 and the lower punch 6 is inserted into the die 4 and is passed between the upper roll 7 and the lower roll 8, the powder filled in the die 4 can be compression-molded. An upper roll 7 and a lower roll 8 are respectively disposed above and below the turntable 3 with the vertical shaft 2 as a center.

The upright shaft 2 is rotated by rotation of a worm wheel 22 fixed near the lower end thereof. The worm wheel 22 meshes with the worm 23, and the driving force of the driving motor 25 is transmitted via the V-belt 24. The upper punch 5 held on the rotating disk 3 is guided by the upper guide rail 21 attached near the upper end of the upright shaft 2 to the highest position near the powder filling position, and reaches the upper roll 7. In the position, it is intended to extend to a lower position where it enters under the upper roll 7. Further, the lower punch 6 is moved up and down by a draft rail 30 provided on the lower side of the turntable 3. After the compression by the lower roll 8 is completed, the lower punch 6 is compressed by a tablet lifting rail 31 at a position beyond the lower roll 8. When the molded product is taken out of the mortar 4, it is guided to the highest position.

The tablet lifting rail 31 integrally includes a sliding portion 31a on which the lower punch 6 slides and moves, and a base 31b supporting the sliding portion 31a. At the position on the tablet push-up rail 31 on the front side in the moving direction of the lower punch 6 relative to the lower roller 81 for full compression, an elongated oval opening 31c is provided on the lower punch track in the track direction. The opening 31c has a width substantially equal to the sliding contact portion 6a of the head of the lower punch 6, has a length substantially equal to the mounting pitch of the lower punch 6, and is provided in the storage recess provided in the base 31b. 31d. That is, the storage recess 31d is provided inside the base 31b, and the opening 31c is provided in the vertical direction with respect to the sliding portion 31a, so that the opening 31c and the storage recess 31d communicate with each other. A push-up pressure detection rail 40 is provided so as to be able to swing up and down over the opening 31c and the storage recess 31d. The push-up pressure detection rail 40 is formed integrally with the beam portion 40a located in the storage recess 31d and extending in the horizontal direction and on the free end side of the beam portion 40a located in the opening 31c and perpendicular to the beam portion 40a. A vertical portion 40b extending in any direction, and a transmission portion 40c for transmitting pressure to a compression load cell 50 as a pressure detection element directly above the vertical portion 40b and above the lower surface of the beam portion 40a.

The beam portion 40 a has its end attached to the base 31 b by a fulcrum pin 41. With the fulcrum pin 41 as a fulcrum, the lifting pressure detection rail 40 swings so that the vertical portion 40b moves up and down. The vertical portion 40b is inclined so that the upper surface thereof is flush with the upper surface of the sliding portion 31a of the tablet pushing rail 31 in accordance with the inclination of the tablet pushing rail 31, and the upper surface of the vertical portion 40b is in plan view corresponding to the opening 31c. It has an oval shape. The transmission portion 40c is different from the upper surface of the vertical portion 40b and is formed of a downward horizontal plane. Below the transmission section 40c, a receiving table 51 on which the compression load cell 50 is placed is fixed to the base 31b with upward bolts 52. Therefore, the compression load cell 50 is sandwiched between the receiving table 51 and the transmission section 40c. The position of the compression load cell 50 is such that one lower punch 6 does not hang on the tablet lifting rail 31 of the lower roller 81 for full compression, and the center of the lower punch 6 when completely placed on the upper surface of the vertical portion 40b. Set immediately below the position. By setting such a position, it is possible to reliably detect the pushing pressure of one lower punch 6. As a measuring device for measuring pressure from an output signal output from the compression load cell 50, a device widely known in the art can be used.

In such a configuration, when the turntable 3 rotates and the powder in the die 4 is compression-molded, the lower punch 6 passes through the lower roller 81 for main compression, and then moves on the tablet lifting rail 31. You will move. The lower punch 6 moves on the tablet lifting rail 31 to reach the opening 31 c and presses against the lifting pressure detection rail 40. At this time, since the substantial length of the push-up pressure detection rail 40 with respect to the lower punch 6 is substantially equal to the pitch of the lower punch 6, the lower punch 6 that is moving first comes off the push-up pressure detection rail 40, and The lower punch 6 is in a state of starting to press against the push-up pressure detection rail 40 (FIG. 3). When the turntable 3 is further rotated, only one of the target lower punches 6 is in pressure contact with the push-up pressure detection rail 40. In this state, the vertical portion 40b of the push-up pressure detection rail 40 descends with the fulcrum pin 41 as a fulcrum. The descending distance changes depending on the pressure acting on the target lower punch 6. The swinging of the push-up pressure detection rail 40 compresses the compression load cell 50 and outputs an output signal corresponding to the pressure acting on the lower punch 6, thereby detecting the push-up pressure. When the turntable 3 is further rotated, the target lower punch 6 moves and separates from the push-up pressure detection rail 40, and the next lower punch 6 comes into pressure contact with the push-up pressure detection rail 40. Thereafter, the lower punches 6 are successively pressed against the lifting pressure detection rails 40 one by one in this manner, and the lifting pressure of each lower punch 6 is detected.

As described above, since the lower punch 6 moving on the tablet lifting rail 31 can detect the lifting pressure each time it reaches a predetermined position on the lifting pressure detection rail 40, the lower punch 6 is affected by other lower punches 6. The lifting pressure can be detected for each of the lower punches 6 without any need. Therefore, an abnormality can be determined for each lower punch 6, and problems such as capping, binding, and lamination can be prevented by stopping the rotation of the turntable 3. In addition, since the push-up pressure detection rail 40 is lowered on the lower punch 6 in which an abnormality has occurred, an abnormally high pressure is not applied to the lower punch 6, so that the lower punch 6 also functions as a safety mechanism for the lower punch 6. Things.

The present invention is not limited to the embodiment described above. In the above-described embodiment, the push-up pressure detection rail 40 in which the beam portion 31b swings up and down by the fulcrum pin 41 has been described. However, a structure in which the vertical portion 40b and the transmission portion 40c are supported so as to be able to move up and down in the opening 31c. May be used. With such a structure, the structure can be further simplified.

In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0017]

[Effect of the invention]

 Since the present invention is configured as described above, it is possible to reliably and accurately detect the lifting pressure of each lower punch. Therefore, it is possible to reliably detect an abnormality of the lower punch due to a change in the push-up pressure, and it is possible to appropriately prevent defects such as capping and binding that occur in a compression-molded product.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an entire configuration of an embodiment of the present invention.

FIG. 2 is a partial plan view showing a main part of the embodiment.

FIG. 3 is an enlarged side view of a main part for explaining the operation of the embodiment.

FIG. 4 is an enlarged front view of essential parts for explaining the operation of the embodiment.

FIG. 5 is an enlarged side view of an essential part for explaining the operation of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Vertical shaft 3 ... Rotating disk 4 ... Die 5 ... Upper punch 6 ... Lower punch 7 ... Upper roll 8 ... Lower roll 31 ... Tablet lifting rail 31c ... Opening 40 ... Pushing pressure detection rail 50 ... Compression load cell

Claims (2)

[Utility model registration claims] 1. A rotating disk is horizontally rotatably disposed in a frame via a vertical shaft, a plurality of dies are provided on the rotating disk at a predetermined pitch, and an upper punch and a lower punch are provided above and below each of the dies. The upper and lower punches, with the tip of the punch inserted into the die, are guided by guide rails and passed between the upper and lower rolls to compress the powder filled in the die. In a rotary powder compression molding machine adapted to be molded, an opening provided in a guide rail for guiding a lower punch, and a push-up pressure detecting rail disposed in the opening so as to be able to ascend and descend flush with the upper surface of the guide rail. And a pressure detecting element disposed below the lifting pressure detection rail and detecting the lifting pressure when one lower punch is mounted on the lifting pressure detection rail. Machine. 2. The rotary powder compression molding machine according to claim 1, wherein the push-up pressure detecting element is a compression load cell.